Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NSA Security-Enhanced Linux (SELinux) security module |
| 3 | * |
| 4 | * This file contains the SELinux hook function implementations. |
| 5 | * |
| 6 | * Authors: Stephen Smalley, <sds@epoch.ncsc.mil> |
| 7 | * Chris Vance, <cvance@nai.com> |
| 8 | * Wayne Salamon, <wsalamon@nai.com> |
| 9 | * James Morris <jmorris@redhat.com> |
| 10 | * |
| 11 | * Copyright (C) 2001,2002 Networks Associates Technology, Inc. |
| 12 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
| 13 | * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. |
| 14 | * <dgoeddel@trustedcs.com> |
| 15 | * |
| 16 | * This program is free software; you can redistribute it and/or modify |
| 17 | * it under the terms of the GNU General Public License version 2, |
| 18 | * as published by the Free Software Foundation. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/config.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/ptrace.h> |
| 26 | #include <linux/errno.h> |
| 27 | #include <linux/sched.h> |
| 28 | #include <linux/security.h> |
| 29 | #include <linux/xattr.h> |
| 30 | #include <linux/capability.h> |
| 31 | #include <linux/unistd.h> |
| 32 | #include <linux/mm.h> |
| 33 | #include <linux/mman.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/pagemap.h> |
| 36 | #include <linux/swap.h> |
| 37 | #include <linux/smp_lock.h> |
| 38 | #include <linux/spinlock.h> |
| 39 | #include <linux/syscalls.h> |
| 40 | #include <linux/file.h> |
| 41 | #include <linux/namei.h> |
| 42 | #include <linux/mount.h> |
| 43 | #include <linux/ext2_fs.h> |
| 44 | #include <linux/proc_fs.h> |
| 45 | #include <linux/kd.h> |
| 46 | #include <linux/netfilter_ipv4.h> |
| 47 | #include <linux/netfilter_ipv6.h> |
| 48 | #include <linux/tty.h> |
| 49 | #include <net/icmp.h> |
| 50 | #include <net/ip.h> /* for sysctl_local_port_range[] */ |
| 51 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ |
| 52 | #include <asm/uaccess.h> |
| 53 | #include <asm/semaphore.h> |
| 54 | #include <asm/ioctls.h> |
| 55 | #include <linux/bitops.h> |
| 56 | #include <linux/interrupt.h> |
| 57 | #include <linux/netdevice.h> /* for network interface checks */ |
| 58 | #include <linux/netlink.h> |
| 59 | #include <linux/tcp.h> |
| 60 | #include <linux/udp.h> |
| 61 | #include <linux/quota.h> |
| 62 | #include <linux/un.h> /* for Unix socket types */ |
| 63 | #include <net/af_unix.h> /* for Unix socket types */ |
| 64 | #include <linux/parser.h> |
| 65 | #include <linux/nfs_mount.h> |
| 66 | #include <net/ipv6.h> |
| 67 | #include <linux/hugetlb.h> |
| 68 | #include <linux/personality.h> |
| 69 | #include <linux/sysctl.h> |
| 70 | #include <linux/audit.h> |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 71 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | #include "avc.h" |
| 74 | #include "objsec.h" |
| 75 | #include "netif.h" |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 76 | #include "xfrm.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
| 78 | #define XATTR_SELINUX_SUFFIX "selinux" |
| 79 | #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX |
| 80 | |
| 81 | extern unsigned int policydb_loaded_version; |
| 82 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); |
| 83 | |
| 84 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
| 85 | int selinux_enforcing = 0; |
| 86 | |
| 87 | static int __init enforcing_setup(char *str) |
| 88 | { |
| 89 | selinux_enforcing = simple_strtol(str,NULL,0); |
| 90 | return 1; |
| 91 | } |
| 92 | __setup("enforcing=", enforcing_setup); |
| 93 | #endif |
| 94 | |
| 95 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM |
| 96 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; |
| 97 | |
| 98 | static int __init selinux_enabled_setup(char *str) |
| 99 | { |
| 100 | selinux_enabled = simple_strtol(str, NULL, 0); |
| 101 | return 1; |
| 102 | } |
| 103 | __setup("selinux=", selinux_enabled_setup); |
| 104 | #endif |
| 105 | |
| 106 | /* Original (dummy) security module. */ |
| 107 | static struct security_operations *original_ops = NULL; |
| 108 | |
| 109 | /* Minimal support for a secondary security module, |
| 110 | just to allow the use of the dummy or capability modules. |
| 111 | The owlsm module can alternatively be used as a secondary |
| 112 | module as long as CONFIG_OWLSM_FD is not enabled. */ |
| 113 | static struct security_operations *secondary_ops = NULL; |
| 114 | |
| 115 | /* Lists of inode and superblock security structures initialized |
| 116 | before the policy was loaded. */ |
| 117 | static LIST_HEAD(superblock_security_head); |
| 118 | static DEFINE_SPINLOCK(sb_security_lock); |
| 119 | |
| 120 | /* Allocate and free functions for each kind of security blob. */ |
| 121 | |
| 122 | static int task_alloc_security(struct task_struct *task) |
| 123 | { |
| 124 | struct task_security_struct *tsec; |
| 125 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 126 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | if (!tsec) |
| 128 | return -ENOMEM; |
| 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | tsec->magic = SELINUX_MAGIC; |
| 131 | tsec->task = task; |
| 132 | tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED; |
| 133 | task->security = tsec; |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | static void task_free_security(struct task_struct *task) |
| 139 | { |
| 140 | struct task_security_struct *tsec = task->security; |
| 141 | |
| 142 | if (!tsec || tsec->magic != SELINUX_MAGIC) |
| 143 | return; |
| 144 | |
| 145 | task->security = NULL; |
| 146 | kfree(tsec); |
| 147 | } |
| 148 | |
| 149 | static int inode_alloc_security(struct inode *inode) |
| 150 | { |
| 151 | struct task_security_struct *tsec = current->security; |
| 152 | struct inode_security_struct *isec; |
| 153 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 154 | isec = kzalloc(sizeof(struct inode_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | if (!isec) |
| 156 | return -ENOMEM; |
| 157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | init_MUTEX(&isec->sem); |
| 159 | INIT_LIST_HEAD(&isec->list); |
| 160 | isec->magic = SELINUX_MAGIC; |
| 161 | isec->inode = inode; |
| 162 | isec->sid = SECINITSID_UNLABELED; |
| 163 | isec->sclass = SECCLASS_FILE; |
| 164 | if (tsec && tsec->magic == SELINUX_MAGIC) |
| 165 | isec->task_sid = tsec->sid; |
| 166 | else |
| 167 | isec->task_sid = SECINITSID_UNLABELED; |
| 168 | inode->i_security = isec; |
| 169 | |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | static void inode_free_security(struct inode *inode) |
| 174 | { |
| 175 | struct inode_security_struct *isec = inode->i_security; |
| 176 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; |
| 177 | |
| 178 | if (!isec || isec->magic != SELINUX_MAGIC) |
| 179 | return; |
| 180 | |
| 181 | spin_lock(&sbsec->isec_lock); |
| 182 | if (!list_empty(&isec->list)) |
| 183 | list_del_init(&isec->list); |
| 184 | spin_unlock(&sbsec->isec_lock); |
| 185 | |
| 186 | inode->i_security = NULL; |
| 187 | kfree(isec); |
| 188 | } |
| 189 | |
| 190 | static int file_alloc_security(struct file *file) |
| 191 | { |
| 192 | struct task_security_struct *tsec = current->security; |
| 193 | struct file_security_struct *fsec; |
| 194 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 195 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | if (!fsec) |
| 197 | return -ENOMEM; |
| 198 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | fsec->magic = SELINUX_MAGIC; |
| 200 | fsec->file = file; |
| 201 | if (tsec && tsec->magic == SELINUX_MAGIC) { |
| 202 | fsec->sid = tsec->sid; |
| 203 | fsec->fown_sid = tsec->sid; |
| 204 | } else { |
| 205 | fsec->sid = SECINITSID_UNLABELED; |
| 206 | fsec->fown_sid = SECINITSID_UNLABELED; |
| 207 | } |
| 208 | file->f_security = fsec; |
| 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | static void file_free_security(struct file *file) |
| 214 | { |
| 215 | struct file_security_struct *fsec = file->f_security; |
| 216 | |
| 217 | if (!fsec || fsec->magic != SELINUX_MAGIC) |
| 218 | return; |
| 219 | |
| 220 | file->f_security = NULL; |
| 221 | kfree(fsec); |
| 222 | } |
| 223 | |
| 224 | static int superblock_alloc_security(struct super_block *sb) |
| 225 | { |
| 226 | struct superblock_security_struct *sbsec; |
| 227 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 228 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | if (!sbsec) |
| 230 | return -ENOMEM; |
| 231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | init_MUTEX(&sbsec->sem); |
| 233 | INIT_LIST_HEAD(&sbsec->list); |
| 234 | INIT_LIST_HEAD(&sbsec->isec_head); |
| 235 | spin_lock_init(&sbsec->isec_lock); |
| 236 | sbsec->magic = SELINUX_MAGIC; |
| 237 | sbsec->sb = sb; |
| 238 | sbsec->sid = SECINITSID_UNLABELED; |
| 239 | sbsec->def_sid = SECINITSID_FILE; |
| 240 | sb->s_security = sbsec; |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | static void superblock_free_security(struct super_block *sb) |
| 246 | { |
| 247 | struct superblock_security_struct *sbsec = sb->s_security; |
| 248 | |
| 249 | if (!sbsec || sbsec->magic != SELINUX_MAGIC) |
| 250 | return; |
| 251 | |
| 252 | spin_lock(&sb_security_lock); |
| 253 | if (!list_empty(&sbsec->list)) |
| 254 | list_del_init(&sbsec->list); |
| 255 | spin_unlock(&sb_security_lock); |
| 256 | |
| 257 | sb->s_security = NULL; |
| 258 | kfree(sbsec); |
| 259 | } |
| 260 | |
| 261 | #ifdef CONFIG_SECURITY_NETWORK |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 262 | static int sk_alloc_security(struct sock *sk, int family, gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | { |
| 264 | struct sk_security_struct *ssec; |
| 265 | |
| 266 | if (family != PF_UNIX) |
| 267 | return 0; |
| 268 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 269 | ssec = kzalloc(sizeof(*ssec), priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | if (!ssec) |
| 271 | return -ENOMEM; |
| 272 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | ssec->magic = SELINUX_MAGIC; |
| 274 | ssec->sk = sk; |
| 275 | ssec->peer_sid = SECINITSID_UNLABELED; |
| 276 | sk->sk_security = ssec; |
| 277 | |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | static void sk_free_security(struct sock *sk) |
| 282 | { |
| 283 | struct sk_security_struct *ssec = sk->sk_security; |
| 284 | |
| 285 | if (sk->sk_family != PF_UNIX || ssec->magic != SELINUX_MAGIC) |
| 286 | return; |
| 287 | |
| 288 | sk->sk_security = NULL; |
| 289 | kfree(ssec); |
| 290 | } |
| 291 | #endif /* CONFIG_SECURITY_NETWORK */ |
| 292 | |
| 293 | /* The security server must be initialized before |
| 294 | any labeling or access decisions can be provided. */ |
| 295 | extern int ss_initialized; |
| 296 | |
| 297 | /* The file system's label must be initialized prior to use. */ |
| 298 | |
| 299 | static char *labeling_behaviors[6] = { |
| 300 | "uses xattr", |
| 301 | "uses transition SIDs", |
| 302 | "uses task SIDs", |
| 303 | "uses genfs_contexts", |
| 304 | "not configured for labeling", |
| 305 | "uses mountpoint labeling", |
| 306 | }; |
| 307 | |
| 308 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); |
| 309 | |
| 310 | static inline int inode_doinit(struct inode *inode) |
| 311 | { |
| 312 | return inode_doinit_with_dentry(inode, NULL); |
| 313 | } |
| 314 | |
| 315 | enum { |
| 316 | Opt_context = 1, |
| 317 | Opt_fscontext = 2, |
| 318 | Opt_defcontext = 4, |
| 319 | }; |
| 320 | |
| 321 | static match_table_t tokens = { |
| 322 | {Opt_context, "context=%s"}, |
| 323 | {Opt_fscontext, "fscontext=%s"}, |
| 324 | {Opt_defcontext, "defcontext=%s"}, |
| 325 | }; |
| 326 | |
| 327 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" |
| 328 | |
| 329 | static int try_context_mount(struct super_block *sb, void *data) |
| 330 | { |
| 331 | char *context = NULL, *defcontext = NULL; |
| 332 | const char *name; |
| 333 | u32 sid; |
| 334 | int alloc = 0, rc = 0, seen = 0; |
| 335 | struct task_security_struct *tsec = current->security; |
| 336 | struct superblock_security_struct *sbsec = sb->s_security; |
| 337 | |
| 338 | if (!data) |
| 339 | goto out; |
| 340 | |
| 341 | name = sb->s_type->name; |
| 342 | |
| 343 | if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) { |
| 344 | |
| 345 | /* NFS we understand. */ |
| 346 | if (!strcmp(name, "nfs")) { |
| 347 | struct nfs_mount_data *d = data; |
| 348 | |
| 349 | if (d->version < NFS_MOUNT_VERSION) |
| 350 | goto out; |
| 351 | |
| 352 | if (d->context[0]) { |
| 353 | context = d->context; |
| 354 | seen |= Opt_context; |
| 355 | } |
| 356 | } else |
| 357 | goto out; |
| 358 | |
| 359 | } else { |
| 360 | /* Standard string-based options. */ |
| 361 | char *p, *options = data; |
| 362 | |
| 363 | while ((p = strsep(&options, ",")) != NULL) { |
| 364 | int token; |
| 365 | substring_t args[MAX_OPT_ARGS]; |
| 366 | |
| 367 | if (!*p) |
| 368 | continue; |
| 369 | |
| 370 | token = match_token(p, tokens, args); |
| 371 | |
| 372 | switch (token) { |
| 373 | case Opt_context: |
| 374 | if (seen) { |
| 375 | rc = -EINVAL; |
| 376 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 377 | goto out_free; |
| 378 | } |
| 379 | context = match_strdup(&args[0]); |
| 380 | if (!context) { |
| 381 | rc = -ENOMEM; |
| 382 | goto out_free; |
| 383 | } |
| 384 | if (!alloc) |
| 385 | alloc = 1; |
| 386 | seen |= Opt_context; |
| 387 | break; |
| 388 | |
| 389 | case Opt_fscontext: |
| 390 | if (seen & (Opt_context|Opt_fscontext)) { |
| 391 | rc = -EINVAL; |
| 392 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 393 | goto out_free; |
| 394 | } |
| 395 | context = match_strdup(&args[0]); |
| 396 | if (!context) { |
| 397 | rc = -ENOMEM; |
| 398 | goto out_free; |
| 399 | } |
| 400 | if (!alloc) |
| 401 | alloc = 1; |
| 402 | seen |= Opt_fscontext; |
| 403 | break; |
| 404 | |
| 405 | case Opt_defcontext: |
| 406 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { |
| 407 | rc = -EINVAL; |
| 408 | printk(KERN_WARNING "SELinux: " |
| 409 | "defcontext option is invalid " |
| 410 | "for this filesystem type\n"); |
| 411 | goto out_free; |
| 412 | } |
| 413 | if (seen & (Opt_context|Opt_defcontext)) { |
| 414 | rc = -EINVAL; |
| 415 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 416 | goto out_free; |
| 417 | } |
| 418 | defcontext = match_strdup(&args[0]); |
| 419 | if (!defcontext) { |
| 420 | rc = -ENOMEM; |
| 421 | goto out_free; |
| 422 | } |
| 423 | if (!alloc) |
| 424 | alloc = 1; |
| 425 | seen |= Opt_defcontext; |
| 426 | break; |
| 427 | |
| 428 | default: |
| 429 | rc = -EINVAL; |
| 430 | printk(KERN_WARNING "SELinux: unknown mount " |
| 431 | "option\n"); |
| 432 | goto out_free; |
| 433 | |
| 434 | } |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | if (!seen) |
| 439 | goto out; |
| 440 | |
| 441 | if (context) { |
| 442 | rc = security_context_to_sid(context, strlen(context), &sid); |
| 443 | if (rc) { |
| 444 | printk(KERN_WARNING "SELinux: security_context_to_sid" |
| 445 | "(%s) failed for (dev %s, type %s) errno=%d\n", |
| 446 | context, sb->s_id, name, rc); |
| 447 | goto out_free; |
| 448 | } |
| 449 | |
| 450 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 451 | FILESYSTEM__RELABELFROM, NULL); |
| 452 | if (rc) |
| 453 | goto out_free; |
| 454 | |
| 455 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, |
| 456 | FILESYSTEM__RELABELTO, NULL); |
| 457 | if (rc) |
| 458 | goto out_free; |
| 459 | |
| 460 | sbsec->sid = sid; |
| 461 | |
| 462 | if (seen & Opt_context) |
| 463 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
| 464 | } |
| 465 | |
| 466 | if (defcontext) { |
| 467 | rc = security_context_to_sid(defcontext, strlen(defcontext), &sid); |
| 468 | if (rc) { |
| 469 | printk(KERN_WARNING "SELinux: security_context_to_sid" |
| 470 | "(%s) failed for (dev %s, type %s) errno=%d\n", |
| 471 | defcontext, sb->s_id, name, rc); |
| 472 | goto out_free; |
| 473 | } |
| 474 | |
| 475 | if (sid == sbsec->def_sid) |
| 476 | goto out_free; |
| 477 | |
| 478 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 479 | FILESYSTEM__RELABELFROM, NULL); |
| 480 | if (rc) |
| 481 | goto out_free; |
| 482 | |
| 483 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 484 | FILESYSTEM__ASSOCIATE, NULL); |
| 485 | if (rc) |
| 486 | goto out_free; |
| 487 | |
| 488 | sbsec->def_sid = sid; |
| 489 | } |
| 490 | |
| 491 | out_free: |
| 492 | if (alloc) { |
| 493 | kfree(context); |
| 494 | kfree(defcontext); |
| 495 | } |
| 496 | out: |
| 497 | return rc; |
| 498 | } |
| 499 | |
| 500 | static int superblock_doinit(struct super_block *sb, void *data) |
| 501 | { |
| 502 | struct superblock_security_struct *sbsec = sb->s_security; |
| 503 | struct dentry *root = sb->s_root; |
| 504 | struct inode *inode = root->d_inode; |
| 505 | int rc = 0; |
| 506 | |
| 507 | down(&sbsec->sem); |
| 508 | if (sbsec->initialized) |
| 509 | goto out; |
| 510 | |
| 511 | if (!ss_initialized) { |
| 512 | /* Defer initialization until selinux_complete_init, |
| 513 | after the initial policy is loaded and the security |
| 514 | server is ready to handle calls. */ |
| 515 | spin_lock(&sb_security_lock); |
| 516 | if (list_empty(&sbsec->list)) |
| 517 | list_add(&sbsec->list, &superblock_security_head); |
| 518 | spin_unlock(&sb_security_lock); |
| 519 | goto out; |
| 520 | } |
| 521 | |
| 522 | /* Determine the labeling behavior to use for this filesystem type. */ |
| 523 | rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid); |
| 524 | if (rc) { |
| 525 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", |
| 526 | __FUNCTION__, sb->s_type->name, rc); |
| 527 | goto out; |
| 528 | } |
| 529 | |
| 530 | rc = try_context_mount(sb, data); |
| 531 | if (rc) |
| 532 | goto out; |
| 533 | |
| 534 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
| 535 | /* Make sure that the xattr handler exists and that no |
| 536 | error other than -ENODATA is returned by getxattr on |
| 537 | the root directory. -ENODATA is ok, as this may be |
| 538 | the first boot of the SELinux kernel before we have |
| 539 | assigned xattr values to the filesystem. */ |
| 540 | if (!inode->i_op->getxattr) { |
| 541 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " |
| 542 | "xattr support\n", sb->s_id, sb->s_type->name); |
| 543 | rc = -EOPNOTSUPP; |
| 544 | goto out; |
| 545 | } |
| 546 | rc = inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); |
| 547 | if (rc < 0 && rc != -ENODATA) { |
| 548 | if (rc == -EOPNOTSUPP) |
| 549 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 550 | "%s) has no security xattr handler\n", |
| 551 | sb->s_id, sb->s_type->name); |
| 552 | else |
| 553 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 554 | "%s) getxattr errno %d\n", sb->s_id, |
| 555 | sb->s_type->name, -rc); |
| 556 | goto out; |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | if (strcmp(sb->s_type->name, "proc") == 0) |
| 561 | sbsec->proc = 1; |
| 562 | |
| 563 | sbsec->initialized = 1; |
| 564 | |
| 565 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) { |
| 566 | printk(KERN_INFO "SELinux: initialized (dev %s, type %s), unknown behavior\n", |
| 567 | sb->s_id, sb->s_type->name); |
| 568 | } |
| 569 | else { |
| 570 | printk(KERN_INFO "SELinux: initialized (dev %s, type %s), %s\n", |
| 571 | sb->s_id, sb->s_type->name, |
| 572 | labeling_behaviors[sbsec->behavior-1]); |
| 573 | } |
| 574 | |
| 575 | /* Initialize the root inode. */ |
| 576 | rc = inode_doinit_with_dentry(sb->s_root->d_inode, sb->s_root); |
| 577 | |
| 578 | /* Initialize any other inodes associated with the superblock, e.g. |
| 579 | inodes created prior to initial policy load or inodes created |
| 580 | during get_sb by a pseudo filesystem that directly |
| 581 | populates itself. */ |
| 582 | spin_lock(&sbsec->isec_lock); |
| 583 | next_inode: |
| 584 | if (!list_empty(&sbsec->isec_head)) { |
| 585 | struct inode_security_struct *isec = |
| 586 | list_entry(sbsec->isec_head.next, |
| 587 | struct inode_security_struct, list); |
| 588 | struct inode *inode = isec->inode; |
| 589 | spin_unlock(&sbsec->isec_lock); |
| 590 | inode = igrab(inode); |
| 591 | if (inode) { |
| 592 | if (!IS_PRIVATE (inode)) |
| 593 | inode_doinit(inode); |
| 594 | iput(inode); |
| 595 | } |
| 596 | spin_lock(&sbsec->isec_lock); |
| 597 | list_del_init(&isec->list); |
| 598 | goto next_inode; |
| 599 | } |
| 600 | spin_unlock(&sbsec->isec_lock); |
| 601 | out: |
| 602 | up(&sbsec->sem); |
| 603 | return rc; |
| 604 | } |
| 605 | |
| 606 | static inline u16 inode_mode_to_security_class(umode_t mode) |
| 607 | { |
| 608 | switch (mode & S_IFMT) { |
| 609 | case S_IFSOCK: |
| 610 | return SECCLASS_SOCK_FILE; |
| 611 | case S_IFLNK: |
| 612 | return SECCLASS_LNK_FILE; |
| 613 | case S_IFREG: |
| 614 | return SECCLASS_FILE; |
| 615 | case S_IFBLK: |
| 616 | return SECCLASS_BLK_FILE; |
| 617 | case S_IFDIR: |
| 618 | return SECCLASS_DIR; |
| 619 | case S_IFCHR: |
| 620 | return SECCLASS_CHR_FILE; |
| 621 | case S_IFIFO: |
| 622 | return SECCLASS_FIFO_FILE; |
| 623 | |
| 624 | } |
| 625 | |
| 626 | return SECCLASS_FILE; |
| 627 | } |
| 628 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 629 | static inline int default_protocol_stream(int protocol) |
| 630 | { |
| 631 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); |
| 632 | } |
| 633 | |
| 634 | static inline int default_protocol_dgram(int protocol) |
| 635 | { |
| 636 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); |
| 637 | } |
| 638 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
| 640 | { |
| 641 | switch (family) { |
| 642 | case PF_UNIX: |
| 643 | switch (type) { |
| 644 | case SOCK_STREAM: |
| 645 | case SOCK_SEQPACKET: |
| 646 | return SECCLASS_UNIX_STREAM_SOCKET; |
| 647 | case SOCK_DGRAM: |
| 648 | return SECCLASS_UNIX_DGRAM_SOCKET; |
| 649 | } |
| 650 | break; |
| 651 | case PF_INET: |
| 652 | case PF_INET6: |
| 653 | switch (type) { |
| 654 | case SOCK_STREAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 655 | if (default_protocol_stream(protocol)) |
| 656 | return SECCLASS_TCP_SOCKET; |
| 657 | else |
| 658 | return SECCLASS_RAWIP_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | case SOCK_DGRAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 660 | if (default_protocol_dgram(protocol)) |
| 661 | return SECCLASS_UDP_SOCKET; |
| 662 | else |
| 663 | return SECCLASS_RAWIP_SOCKET; |
| 664 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | return SECCLASS_RAWIP_SOCKET; |
| 666 | } |
| 667 | break; |
| 668 | case PF_NETLINK: |
| 669 | switch (protocol) { |
| 670 | case NETLINK_ROUTE: |
| 671 | return SECCLASS_NETLINK_ROUTE_SOCKET; |
| 672 | case NETLINK_FIREWALL: |
| 673 | return SECCLASS_NETLINK_FIREWALL_SOCKET; |
James Morris | 216efaa | 2005-08-15 20:34:48 -0700 | [diff] [blame] | 674 | case NETLINK_INET_DIAG: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
| 676 | case NETLINK_NFLOG: |
| 677 | return SECCLASS_NETLINK_NFLOG_SOCKET; |
| 678 | case NETLINK_XFRM: |
| 679 | return SECCLASS_NETLINK_XFRM_SOCKET; |
| 680 | case NETLINK_SELINUX: |
| 681 | return SECCLASS_NETLINK_SELINUX_SOCKET; |
| 682 | case NETLINK_AUDIT: |
| 683 | return SECCLASS_NETLINK_AUDIT_SOCKET; |
| 684 | case NETLINK_IP6_FW: |
| 685 | return SECCLASS_NETLINK_IP6FW_SOCKET; |
| 686 | case NETLINK_DNRTMSG: |
| 687 | return SECCLASS_NETLINK_DNRT_SOCKET; |
James Morris | 0c9b794 | 2005-04-16 15:24:13 -0700 | [diff] [blame] | 688 | case NETLINK_KOBJECT_UEVENT: |
| 689 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | default: |
| 691 | return SECCLASS_NETLINK_SOCKET; |
| 692 | } |
| 693 | case PF_PACKET: |
| 694 | return SECCLASS_PACKET_SOCKET; |
| 695 | case PF_KEY: |
| 696 | return SECCLASS_KEY_SOCKET; |
| 697 | } |
| 698 | |
| 699 | return SECCLASS_SOCKET; |
| 700 | } |
| 701 | |
| 702 | #ifdef CONFIG_PROC_FS |
| 703 | static int selinux_proc_get_sid(struct proc_dir_entry *de, |
| 704 | u16 tclass, |
| 705 | u32 *sid) |
| 706 | { |
| 707 | int buflen, rc; |
| 708 | char *buffer, *path, *end; |
| 709 | |
| 710 | buffer = (char*)__get_free_page(GFP_KERNEL); |
| 711 | if (!buffer) |
| 712 | return -ENOMEM; |
| 713 | |
| 714 | buflen = PAGE_SIZE; |
| 715 | end = buffer+buflen; |
| 716 | *--end = '\0'; |
| 717 | buflen--; |
| 718 | path = end-1; |
| 719 | *path = '/'; |
| 720 | while (de && de != de->parent) { |
| 721 | buflen -= de->namelen + 1; |
| 722 | if (buflen < 0) |
| 723 | break; |
| 724 | end -= de->namelen; |
| 725 | memcpy(end, de->name, de->namelen); |
| 726 | *--end = '/'; |
| 727 | path = end; |
| 728 | de = de->parent; |
| 729 | } |
| 730 | rc = security_genfs_sid("proc", path, tclass, sid); |
| 731 | free_page((unsigned long)buffer); |
| 732 | return rc; |
| 733 | } |
| 734 | #else |
| 735 | static int selinux_proc_get_sid(struct proc_dir_entry *de, |
| 736 | u16 tclass, |
| 737 | u32 *sid) |
| 738 | { |
| 739 | return -EINVAL; |
| 740 | } |
| 741 | #endif |
| 742 | |
| 743 | /* The inode's security attributes must be initialized before first use. */ |
| 744 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) |
| 745 | { |
| 746 | struct superblock_security_struct *sbsec = NULL; |
| 747 | struct inode_security_struct *isec = inode->i_security; |
| 748 | u32 sid; |
| 749 | struct dentry *dentry; |
| 750 | #define INITCONTEXTLEN 255 |
| 751 | char *context = NULL; |
| 752 | unsigned len = 0; |
| 753 | int rc = 0; |
| 754 | int hold_sem = 0; |
| 755 | |
| 756 | if (isec->initialized) |
| 757 | goto out; |
| 758 | |
| 759 | down(&isec->sem); |
| 760 | hold_sem = 1; |
| 761 | if (isec->initialized) |
| 762 | goto out; |
| 763 | |
| 764 | sbsec = inode->i_sb->s_security; |
| 765 | if (!sbsec->initialized) { |
| 766 | /* Defer initialization until selinux_complete_init, |
| 767 | after the initial policy is loaded and the security |
| 768 | server is ready to handle calls. */ |
| 769 | spin_lock(&sbsec->isec_lock); |
| 770 | if (list_empty(&isec->list)) |
| 771 | list_add(&isec->list, &sbsec->isec_head); |
| 772 | spin_unlock(&sbsec->isec_lock); |
| 773 | goto out; |
| 774 | } |
| 775 | |
| 776 | switch (sbsec->behavior) { |
| 777 | case SECURITY_FS_USE_XATTR: |
| 778 | if (!inode->i_op->getxattr) { |
| 779 | isec->sid = sbsec->def_sid; |
| 780 | break; |
| 781 | } |
| 782 | |
| 783 | /* Need a dentry, since the xattr API requires one. |
| 784 | Life would be simpler if we could just pass the inode. */ |
| 785 | if (opt_dentry) { |
| 786 | /* Called from d_instantiate or d_splice_alias. */ |
| 787 | dentry = dget(opt_dentry); |
| 788 | } else { |
| 789 | /* Called from selinux_complete_init, try to find a dentry. */ |
| 790 | dentry = d_find_alias(inode); |
| 791 | } |
| 792 | if (!dentry) { |
| 793 | printk(KERN_WARNING "%s: no dentry for dev=%s " |
| 794 | "ino=%ld\n", __FUNCTION__, inode->i_sb->s_id, |
| 795 | inode->i_ino); |
| 796 | goto out; |
| 797 | } |
| 798 | |
| 799 | len = INITCONTEXTLEN; |
| 800 | context = kmalloc(len, GFP_KERNEL); |
| 801 | if (!context) { |
| 802 | rc = -ENOMEM; |
| 803 | dput(dentry); |
| 804 | goto out; |
| 805 | } |
| 806 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 807 | context, len); |
| 808 | if (rc == -ERANGE) { |
| 809 | /* Need a larger buffer. Query for the right size. */ |
| 810 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 811 | NULL, 0); |
| 812 | if (rc < 0) { |
| 813 | dput(dentry); |
| 814 | goto out; |
| 815 | } |
| 816 | kfree(context); |
| 817 | len = rc; |
| 818 | context = kmalloc(len, GFP_KERNEL); |
| 819 | if (!context) { |
| 820 | rc = -ENOMEM; |
| 821 | dput(dentry); |
| 822 | goto out; |
| 823 | } |
| 824 | rc = inode->i_op->getxattr(dentry, |
| 825 | XATTR_NAME_SELINUX, |
| 826 | context, len); |
| 827 | } |
| 828 | dput(dentry); |
| 829 | if (rc < 0) { |
| 830 | if (rc != -ENODATA) { |
| 831 | printk(KERN_WARNING "%s: getxattr returned " |
| 832 | "%d for dev=%s ino=%ld\n", __FUNCTION__, |
| 833 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 834 | kfree(context); |
| 835 | goto out; |
| 836 | } |
| 837 | /* Map ENODATA to the default file SID */ |
| 838 | sid = sbsec->def_sid; |
| 839 | rc = 0; |
| 840 | } else { |
James Morris | f5c1d5b | 2005-07-28 01:07:37 -0700 | [diff] [blame] | 841 | rc = security_context_to_sid_default(context, rc, &sid, |
| 842 | sbsec->def_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | if (rc) { |
| 844 | printk(KERN_WARNING "%s: context_to_sid(%s) " |
| 845 | "returned %d for dev=%s ino=%ld\n", |
| 846 | __FUNCTION__, context, -rc, |
| 847 | inode->i_sb->s_id, inode->i_ino); |
| 848 | kfree(context); |
| 849 | /* Leave with the unlabeled SID */ |
| 850 | rc = 0; |
| 851 | break; |
| 852 | } |
| 853 | } |
| 854 | kfree(context); |
| 855 | isec->sid = sid; |
| 856 | break; |
| 857 | case SECURITY_FS_USE_TASK: |
| 858 | isec->sid = isec->task_sid; |
| 859 | break; |
| 860 | case SECURITY_FS_USE_TRANS: |
| 861 | /* Default to the fs SID. */ |
| 862 | isec->sid = sbsec->sid; |
| 863 | |
| 864 | /* Try to obtain a transition SID. */ |
| 865 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 866 | rc = security_transition_sid(isec->task_sid, |
| 867 | sbsec->sid, |
| 868 | isec->sclass, |
| 869 | &sid); |
| 870 | if (rc) |
| 871 | goto out; |
| 872 | isec->sid = sid; |
| 873 | break; |
| 874 | default: |
| 875 | /* Default to the fs SID. */ |
| 876 | isec->sid = sbsec->sid; |
| 877 | |
| 878 | if (sbsec->proc) { |
| 879 | struct proc_inode *proci = PROC_I(inode); |
| 880 | if (proci->pde) { |
| 881 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 882 | rc = selinux_proc_get_sid(proci->pde, |
| 883 | isec->sclass, |
| 884 | &sid); |
| 885 | if (rc) |
| 886 | goto out; |
| 887 | isec->sid = sid; |
| 888 | } |
| 889 | } |
| 890 | break; |
| 891 | } |
| 892 | |
| 893 | isec->initialized = 1; |
| 894 | |
| 895 | out: |
| 896 | if (isec->sclass == SECCLASS_FILE) |
| 897 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 898 | |
| 899 | if (hold_sem) |
| 900 | up(&isec->sem); |
| 901 | return rc; |
| 902 | } |
| 903 | |
| 904 | /* Convert a Linux signal to an access vector. */ |
| 905 | static inline u32 signal_to_av(int sig) |
| 906 | { |
| 907 | u32 perm = 0; |
| 908 | |
| 909 | switch (sig) { |
| 910 | case SIGCHLD: |
| 911 | /* Commonly granted from child to parent. */ |
| 912 | perm = PROCESS__SIGCHLD; |
| 913 | break; |
| 914 | case SIGKILL: |
| 915 | /* Cannot be caught or ignored */ |
| 916 | perm = PROCESS__SIGKILL; |
| 917 | break; |
| 918 | case SIGSTOP: |
| 919 | /* Cannot be caught or ignored */ |
| 920 | perm = PROCESS__SIGSTOP; |
| 921 | break; |
| 922 | default: |
| 923 | /* All other signals. */ |
| 924 | perm = PROCESS__SIGNAL; |
| 925 | break; |
| 926 | } |
| 927 | |
| 928 | return perm; |
| 929 | } |
| 930 | |
| 931 | /* Check permission betweeen a pair of tasks, e.g. signal checks, |
| 932 | fork check, ptrace check, etc. */ |
| 933 | static int task_has_perm(struct task_struct *tsk1, |
| 934 | struct task_struct *tsk2, |
| 935 | u32 perms) |
| 936 | { |
| 937 | struct task_security_struct *tsec1, *tsec2; |
| 938 | |
| 939 | tsec1 = tsk1->security; |
| 940 | tsec2 = tsk2->security; |
| 941 | return avc_has_perm(tsec1->sid, tsec2->sid, |
| 942 | SECCLASS_PROCESS, perms, NULL); |
| 943 | } |
| 944 | |
| 945 | /* Check whether a task is allowed to use a capability. */ |
| 946 | static int task_has_capability(struct task_struct *tsk, |
| 947 | int cap) |
| 948 | { |
| 949 | struct task_security_struct *tsec; |
| 950 | struct avc_audit_data ad; |
| 951 | |
| 952 | tsec = tsk->security; |
| 953 | |
| 954 | AVC_AUDIT_DATA_INIT(&ad,CAP); |
| 955 | ad.tsk = tsk; |
| 956 | ad.u.cap = cap; |
| 957 | |
| 958 | return avc_has_perm(tsec->sid, tsec->sid, |
| 959 | SECCLASS_CAPABILITY, CAP_TO_MASK(cap), &ad); |
| 960 | } |
| 961 | |
| 962 | /* Check whether a task is allowed to use a system operation. */ |
| 963 | static int task_has_system(struct task_struct *tsk, |
| 964 | u32 perms) |
| 965 | { |
| 966 | struct task_security_struct *tsec; |
| 967 | |
| 968 | tsec = tsk->security; |
| 969 | |
| 970 | return avc_has_perm(tsec->sid, SECINITSID_KERNEL, |
| 971 | SECCLASS_SYSTEM, perms, NULL); |
| 972 | } |
| 973 | |
| 974 | /* Check whether a task has a particular permission to an inode. |
| 975 | The 'adp' parameter is optional and allows other audit |
| 976 | data to be passed (e.g. the dentry). */ |
| 977 | static int inode_has_perm(struct task_struct *tsk, |
| 978 | struct inode *inode, |
| 979 | u32 perms, |
| 980 | struct avc_audit_data *adp) |
| 981 | { |
| 982 | struct task_security_struct *tsec; |
| 983 | struct inode_security_struct *isec; |
| 984 | struct avc_audit_data ad; |
| 985 | |
| 986 | tsec = tsk->security; |
| 987 | isec = inode->i_security; |
| 988 | |
| 989 | if (!adp) { |
| 990 | adp = &ad; |
| 991 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 992 | ad.u.fs.inode = inode; |
| 993 | } |
| 994 | |
| 995 | return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp); |
| 996 | } |
| 997 | |
| 998 | /* Same as inode_has_perm, but pass explicit audit data containing |
| 999 | the dentry to help the auditing code to more easily generate the |
| 1000 | pathname if needed. */ |
| 1001 | static inline int dentry_has_perm(struct task_struct *tsk, |
| 1002 | struct vfsmount *mnt, |
| 1003 | struct dentry *dentry, |
| 1004 | u32 av) |
| 1005 | { |
| 1006 | struct inode *inode = dentry->d_inode; |
| 1007 | struct avc_audit_data ad; |
| 1008 | AVC_AUDIT_DATA_INIT(&ad,FS); |
| 1009 | ad.u.fs.mnt = mnt; |
| 1010 | ad.u.fs.dentry = dentry; |
| 1011 | return inode_has_perm(tsk, inode, av, &ad); |
| 1012 | } |
| 1013 | |
| 1014 | /* Check whether a task can use an open file descriptor to |
| 1015 | access an inode in a given way. Check access to the |
| 1016 | descriptor itself, and then use dentry_has_perm to |
| 1017 | check a particular permission to the file. |
| 1018 | Access to the descriptor is implicitly granted if it |
| 1019 | has the same SID as the process. If av is zero, then |
| 1020 | access to the file is not checked, e.g. for cases |
| 1021 | where only the descriptor is affected like seek. */ |
| 1022 | static inline int file_has_perm(struct task_struct *tsk, |
| 1023 | struct file *file, |
| 1024 | u32 av) |
| 1025 | { |
| 1026 | struct task_security_struct *tsec = tsk->security; |
| 1027 | struct file_security_struct *fsec = file->f_security; |
| 1028 | struct vfsmount *mnt = file->f_vfsmnt; |
| 1029 | struct dentry *dentry = file->f_dentry; |
| 1030 | struct inode *inode = dentry->d_inode; |
| 1031 | struct avc_audit_data ad; |
| 1032 | int rc; |
| 1033 | |
| 1034 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1035 | ad.u.fs.mnt = mnt; |
| 1036 | ad.u.fs.dentry = dentry; |
| 1037 | |
| 1038 | if (tsec->sid != fsec->sid) { |
| 1039 | rc = avc_has_perm(tsec->sid, fsec->sid, |
| 1040 | SECCLASS_FD, |
| 1041 | FD__USE, |
| 1042 | &ad); |
| 1043 | if (rc) |
| 1044 | return rc; |
| 1045 | } |
| 1046 | |
| 1047 | /* av is zero if only checking access to the descriptor. */ |
| 1048 | if (av) |
| 1049 | return inode_has_perm(tsk, inode, av, &ad); |
| 1050 | |
| 1051 | return 0; |
| 1052 | } |
| 1053 | |
| 1054 | /* Check whether a task can create a file. */ |
| 1055 | static int may_create(struct inode *dir, |
| 1056 | struct dentry *dentry, |
| 1057 | u16 tclass) |
| 1058 | { |
| 1059 | struct task_security_struct *tsec; |
| 1060 | struct inode_security_struct *dsec; |
| 1061 | struct superblock_security_struct *sbsec; |
| 1062 | u32 newsid; |
| 1063 | struct avc_audit_data ad; |
| 1064 | int rc; |
| 1065 | |
| 1066 | tsec = current->security; |
| 1067 | dsec = dir->i_security; |
| 1068 | sbsec = dir->i_sb->s_security; |
| 1069 | |
| 1070 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1071 | ad.u.fs.dentry = dentry; |
| 1072 | |
| 1073 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, |
| 1074 | DIR__ADD_NAME | DIR__SEARCH, |
| 1075 | &ad); |
| 1076 | if (rc) |
| 1077 | return rc; |
| 1078 | |
| 1079 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { |
| 1080 | newsid = tsec->create_sid; |
| 1081 | } else { |
| 1082 | rc = security_transition_sid(tsec->sid, dsec->sid, tclass, |
| 1083 | &newsid); |
| 1084 | if (rc) |
| 1085 | return rc; |
| 1086 | } |
| 1087 | |
| 1088 | rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad); |
| 1089 | if (rc) |
| 1090 | return rc; |
| 1091 | |
| 1092 | return avc_has_perm(newsid, sbsec->sid, |
| 1093 | SECCLASS_FILESYSTEM, |
| 1094 | FILESYSTEM__ASSOCIATE, &ad); |
| 1095 | } |
| 1096 | |
| 1097 | #define MAY_LINK 0 |
| 1098 | #define MAY_UNLINK 1 |
| 1099 | #define MAY_RMDIR 2 |
| 1100 | |
| 1101 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ |
| 1102 | static int may_link(struct inode *dir, |
| 1103 | struct dentry *dentry, |
| 1104 | int kind) |
| 1105 | |
| 1106 | { |
| 1107 | struct task_security_struct *tsec; |
| 1108 | struct inode_security_struct *dsec, *isec; |
| 1109 | struct avc_audit_data ad; |
| 1110 | u32 av; |
| 1111 | int rc; |
| 1112 | |
| 1113 | tsec = current->security; |
| 1114 | dsec = dir->i_security; |
| 1115 | isec = dentry->d_inode->i_security; |
| 1116 | |
| 1117 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1118 | ad.u.fs.dentry = dentry; |
| 1119 | |
| 1120 | av = DIR__SEARCH; |
| 1121 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); |
| 1122 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad); |
| 1123 | if (rc) |
| 1124 | return rc; |
| 1125 | |
| 1126 | switch (kind) { |
| 1127 | case MAY_LINK: |
| 1128 | av = FILE__LINK; |
| 1129 | break; |
| 1130 | case MAY_UNLINK: |
| 1131 | av = FILE__UNLINK; |
| 1132 | break; |
| 1133 | case MAY_RMDIR: |
| 1134 | av = DIR__RMDIR; |
| 1135 | break; |
| 1136 | default: |
| 1137 | printk(KERN_WARNING "may_link: unrecognized kind %d\n", kind); |
| 1138 | return 0; |
| 1139 | } |
| 1140 | |
| 1141 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad); |
| 1142 | return rc; |
| 1143 | } |
| 1144 | |
| 1145 | static inline int may_rename(struct inode *old_dir, |
| 1146 | struct dentry *old_dentry, |
| 1147 | struct inode *new_dir, |
| 1148 | struct dentry *new_dentry) |
| 1149 | { |
| 1150 | struct task_security_struct *tsec; |
| 1151 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; |
| 1152 | struct avc_audit_data ad; |
| 1153 | u32 av; |
| 1154 | int old_is_dir, new_is_dir; |
| 1155 | int rc; |
| 1156 | |
| 1157 | tsec = current->security; |
| 1158 | old_dsec = old_dir->i_security; |
| 1159 | old_isec = old_dentry->d_inode->i_security; |
| 1160 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); |
| 1161 | new_dsec = new_dir->i_security; |
| 1162 | |
| 1163 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1164 | |
| 1165 | ad.u.fs.dentry = old_dentry; |
| 1166 | rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR, |
| 1167 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); |
| 1168 | if (rc) |
| 1169 | return rc; |
| 1170 | rc = avc_has_perm(tsec->sid, old_isec->sid, |
| 1171 | old_isec->sclass, FILE__RENAME, &ad); |
| 1172 | if (rc) |
| 1173 | return rc; |
| 1174 | if (old_is_dir && new_dir != old_dir) { |
| 1175 | rc = avc_has_perm(tsec->sid, old_isec->sid, |
| 1176 | old_isec->sclass, DIR__REPARENT, &ad); |
| 1177 | if (rc) |
| 1178 | return rc; |
| 1179 | } |
| 1180 | |
| 1181 | ad.u.fs.dentry = new_dentry; |
| 1182 | av = DIR__ADD_NAME | DIR__SEARCH; |
| 1183 | if (new_dentry->d_inode) |
| 1184 | av |= DIR__REMOVE_NAME; |
| 1185 | rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad); |
| 1186 | if (rc) |
| 1187 | return rc; |
| 1188 | if (new_dentry->d_inode) { |
| 1189 | new_isec = new_dentry->d_inode->i_security; |
| 1190 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); |
| 1191 | rc = avc_has_perm(tsec->sid, new_isec->sid, |
| 1192 | new_isec->sclass, |
| 1193 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); |
| 1194 | if (rc) |
| 1195 | return rc; |
| 1196 | } |
| 1197 | |
| 1198 | return 0; |
| 1199 | } |
| 1200 | |
| 1201 | /* Check whether a task can perform a filesystem operation. */ |
| 1202 | static int superblock_has_perm(struct task_struct *tsk, |
| 1203 | struct super_block *sb, |
| 1204 | u32 perms, |
| 1205 | struct avc_audit_data *ad) |
| 1206 | { |
| 1207 | struct task_security_struct *tsec; |
| 1208 | struct superblock_security_struct *sbsec; |
| 1209 | |
| 1210 | tsec = tsk->security; |
| 1211 | sbsec = sb->s_security; |
| 1212 | return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 1213 | perms, ad); |
| 1214 | } |
| 1215 | |
| 1216 | /* Convert a Linux mode and permission mask to an access vector. */ |
| 1217 | static inline u32 file_mask_to_av(int mode, int mask) |
| 1218 | { |
| 1219 | u32 av = 0; |
| 1220 | |
| 1221 | if ((mode & S_IFMT) != S_IFDIR) { |
| 1222 | if (mask & MAY_EXEC) |
| 1223 | av |= FILE__EXECUTE; |
| 1224 | if (mask & MAY_READ) |
| 1225 | av |= FILE__READ; |
| 1226 | |
| 1227 | if (mask & MAY_APPEND) |
| 1228 | av |= FILE__APPEND; |
| 1229 | else if (mask & MAY_WRITE) |
| 1230 | av |= FILE__WRITE; |
| 1231 | |
| 1232 | } else { |
| 1233 | if (mask & MAY_EXEC) |
| 1234 | av |= DIR__SEARCH; |
| 1235 | if (mask & MAY_WRITE) |
| 1236 | av |= DIR__WRITE; |
| 1237 | if (mask & MAY_READ) |
| 1238 | av |= DIR__READ; |
| 1239 | } |
| 1240 | |
| 1241 | return av; |
| 1242 | } |
| 1243 | |
| 1244 | /* Convert a Linux file to an access vector. */ |
| 1245 | static inline u32 file_to_av(struct file *file) |
| 1246 | { |
| 1247 | u32 av = 0; |
| 1248 | |
| 1249 | if (file->f_mode & FMODE_READ) |
| 1250 | av |= FILE__READ; |
| 1251 | if (file->f_mode & FMODE_WRITE) { |
| 1252 | if (file->f_flags & O_APPEND) |
| 1253 | av |= FILE__APPEND; |
| 1254 | else |
| 1255 | av |= FILE__WRITE; |
| 1256 | } |
| 1257 | |
| 1258 | return av; |
| 1259 | } |
| 1260 | |
| 1261 | /* Set an inode's SID to a specified value. */ |
| 1262 | static int inode_security_set_sid(struct inode *inode, u32 sid) |
| 1263 | { |
| 1264 | struct inode_security_struct *isec = inode->i_security; |
| 1265 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; |
| 1266 | |
| 1267 | if (!sbsec->initialized) { |
| 1268 | /* Defer initialization to selinux_complete_init. */ |
| 1269 | return 0; |
| 1270 | } |
| 1271 | |
| 1272 | down(&isec->sem); |
| 1273 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 1274 | isec->sid = sid; |
| 1275 | isec->initialized = 1; |
| 1276 | up(&isec->sem); |
| 1277 | return 0; |
| 1278 | } |
| 1279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | /* Hook functions begin here. */ |
| 1281 | |
| 1282 | static int selinux_ptrace(struct task_struct *parent, struct task_struct *child) |
| 1283 | { |
| 1284 | struct task_security_struct *psec = parent->security; |
| 1285 | struct task_security_struct *csec = child->security; |
| 1286 | int rc; |
| 1287 | |
| 1288 | rc = secondary_ops->ptrace(parent,child); |
| 1289 | if (rc) |
| 1290 | return rc; |
| 1291 | |
| 1292 | rc = task_has_perm(parent, child, PROCESS__PTRACE); |
| 1293 | /* Save the SID of the tracing process for later use in apply_creds. */ |
| 1294 | if (!rc) |
| 1295 | csec->ptrace_sid = psec->sid; |
| 1296 | return rc; |
| 1297 | } |
| 1298 | |
| 1299 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, |
| 1300 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
| 1301 | { |
| 1302 | int error; |
| 1303 | |
| 1304 | error = task_has_perm(current, target, PROCESS__GETCAP); |
| 1305 | if (error) |
| 1306 | return error; |
| 1307 | |
| 1308 | return secondary_ops->capget(target, effective, inheritable, permitted); |
| 1309 | } |
| 1310 | |
| 1311 | static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective, |
| 1312 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
| 1313 | { |
| 1314 | int error; |
| 1315 | |
| 1316 | error = secondary_ops->capset_check(target, effective, inheritable, permitted); |
| 1317 | if (error) |
| 1318 | return error; |
| 1319 | |
| 1320 | return task_has_perm(current, target, PROCESS__SETCAP); |
| 1321 | } |
| 1322 | |
| 1323 | static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective, |
| 1324 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
| 1325 | { |
| 1326 | secondary_ops->capset_set(target, effective, inheritable, permitted); |
| 1327 | } |
| 1328 | |
| 1329 | static int selinux_capable(struct task_struct *tsk, int cap) |
| 1330 | { |
| 1331 | int rc; |
| 1332 | |
| 1333 | rc = secondary_ops->capable(tsk, cap); |
| 1334 | if (rc) |
| 1335 | return rc; |
| 1336 | |
| 1337 | return task_has_capability(tsk,cap); |
| 1338 | } |
| 1339 | |
| 1340 | static int selinux_sysctl(ctl_table *table, int op) |
| 1341 | { |
| 1342 | int error = 0; |
| 1343 | u32 av; |
| 1344 | struct task_security_struct *tsec; |
| 1345 | u32 tsid; |
| 1346 | int rc; |
| 1347 | |
| 1348 | rc = secondary_ops->sysctl(table, op); |
| 1349 | if (rc) |
| 1350 | return rc; |
| 1351 | |
| 1352 | tsec = current->security; |
| 1353 | |
| 1354 | rc = selinux_proc_get_sid(table->de, (op == 001) ? |
| 1355 | SECCLASS_DIR : SECCLASS_FILE, &tsid); |
| 1356 | if (rc) { |
| 1357 | /* Default to the well-defined sysctl SID. */ |
| 1358 | tsid = SECINITSID_SYSCTL; |
| 1359 | } |
| 1360 | |
| 1361 | /* The op values are "defined" in sysctl.c, thereby creating |
| 1362 | * a bad coupling between this module and sysctl.c */ |
| 1363 | if(op == 001) { |
| 1364 | error = avc_has_perm(tsec->sid, tsid, |
| 1365 | SECCLASS_DIR, DIR__SEARCH, NULL); |
| 1366 | } else { |
| 1367 | av = 0; |
| 1368 | if (op & 004) |
| 1369 | av |= FILE__READ; |
| 1370 | if (op & 002) |
| 1371 | av |= FILE__WRITE; |
| 1372 | if (av) |
| 1373 | error = avc_has_perm(tsec->sid, tsid, |
| 1374 | SECCLASS_FILE, av, NULL); |
| 1375 | } |
| 1376 | |
| 1377 | return error; |
| 1378 | } |
| 1379 | |
| 1380 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) |
| 1381 | { |
| 1382 | int rc = 0; |
| 1383 | |
| 1384 | if (!sb) |
| 1385 | return 0; |
| 1386 | |
| 1387 | switch (cmds) { |
| 1388 | case Q_SYNC: |
| 1389 | case Q_QUOTAON: |
| 1390 | case Q_QUOTAOFF: |
| 1391 | case Q_SETINFO: |
| 1392 | case Q_SETQUOTA: |
| 1393 | rc = superblock_has_perm(current, |
| 1394 | sb, |
| 1395 | FILESYSTEM__QUOTAMOD, NULL); |
| 1396 | break; |
| 1397 | case Q_GETFMT: |
| 1398 | case Q_GETINFO: |
| 1399 | case Q_GETQUOTA: |
| 1400 | rc = superblock_has_perm(current, |
| 1401 | sb, |
| 1402 | FILESYSTEM__QUOTAGET, NULL); |
| 1403 | break; |
| 1404 | default: |
| 1405 | rc = 0; /* let the kernel handle invalid cmds */ |
| 1406 | break; |
| 1407 | } |
| 1408 | return rc; |
| 1409 | } |
| 1410 | |
| 1411 | static int selinux_quota_on(struct dentry *dentry) |
| 1412 | { |
| 1413 | return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON); |
| 1414 | } |
| 1415 | |
| 1416 | static int selinux_syslog(int type) |
| 1417 | { |
| 1418 | int rc; |
| 1419 | |
| 1420 | rc = secondary_ops->syslog(type); |
| 1421 | if (rc) |
| 1422 | return rc; |
| 1423 | |
| 1424 | switch (type) { |
| 1425 | case 3: /* Read last kernel messages */ |
| 1426 | case 10: /* Return size of the log buffer */ |
| 1427 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); |
| 1428 | break; |
| 1429 | case 6: /* Disable logging to console */ |
| 1430 | case 7: /* Enable logging to console */ |
| 1431 | case 8: /* Set level of messages printed to console */ |
| 1432 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); |
| 1433 | break; |
| 1434 | case 0: /* Close log */ |
| 1435 | case 1: /* Open log */ |
| 1436 | case 2: /* Read from log */ |
| 1437 | case 4: /* Read/clear last kernel messages */ |
| 1438 | case 5: /* Clear ring buffer */ |
| 1439 | default: |
| 1440 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); |
| 1441 | break; |
| 1442 | } |
| 1443 | return rc; |
| 1444 | } |
| 1445 | |
| 1446 | /* |
| 1447 | * Check that a process has enough memory to allocate a new virtual |
| 1448 | * mapping. 0 means there is enough memory for the allocation to |
| 1449 | * succeed and -ENOMEM implies there is not. |
| 1450 | * |
| 1451 | * Note that secondary_ops->capable and task_has_perm_noaudit return 0 |
| 1452 | * if the capability is granted, but __vm_enough_memory requires 1 if |
| 1453 | * the capability is granted. |
| 1454 | * |
| 1455 | * Do not audit the selinux permission check, as this is applied to all |
| 1456 | * processes that allocate mappings. |
| 1457 | */ |
| 1458 | static int selinux_vm_enough_memory(long pages) |
| 1459 | { |
| 1460 | int rc, cap_sys_admin = 0; |
| 1461 | struct task_security_struct *tsec = current->security; |
| 1462 | |
| 1463 | rc = secondary_ops->capable(current, CAP_SYS_ADMIN); |
| 1464 | if (rc == 0) |
| 1465 | rc = avc_has_perm_noaudit(tsec->sid, tsec->sid, |
| 1466 | SECCLASS_CAPABILITY, |
| 1467 | CAP_TO_MASK(CAP_SYS_ADMIN), |
| 1468 | NULL); |
| 1469 | |
| 1470 | if (rc == 0) |
| 1471 | cap_sys_admin = 1; |
| 1472 | |
| 1473 | return __vm_enough_memory(pages, cap_sys_admin); |
| 1474 | } |
| 1475 | |
| 1476 | /* binprm security operations */ |
| 1477 | |
| 1478 | static int selinux_bprm_alloc_security(struct linux_binprm *bprm) |
| 1479 | { |
| 1480 | struct bprm_security_struct *bsec; |
| 1481 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 1482 | bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | if (!bsec) |
| 1484 | return -ENOMEM; |
| 1485 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | bsec->magic = SELINUX_MAGIC; |
| 1487 | bsec->bprm = bprm; |
| 1488 | bsec->sid = SECINITSID_UNLABELED; |
| 1489 | bsec->set = 0; |
| 1490 | |
| 1491 | bprm->security = bsec; |
| 1492 | return 0; |
| 1493 | } |
| 1494 | |
| 1495 | static int selinux_bprm_set_security(struct linux_binprm *bprm) |
| 1496 | { |
| 1497 | struct task_security_struct *tsec; |
| 1498 | struct inode *inode = bprm->file->f_dentry->d_inode; |
| 1499 | struct inode_security_struct *isec; |
| 1500 | struct bprm_security_struct *bsec; |
| 1501 | u32 newsid; |
| 1502 | struct avc_audit_data ad; |
| 1503 | int rc; |
| 1504 | |
| 1505 | rc = secondary_ops->bprm_set_security(bprm); |
| 1506 | if (rc) |
| 1507 | return rc; |
| 1508 | |
| 1509 | bsec = bprm->security; |
| 1510 | |
| 1511 | if (bsec->set) |
| 1512 | return 0; |
| 1513 | |
| 1514 | tsec = current->security; |
| 1515 | isec = inode->i_security; |
| 1516 | |
| 1517 | /* Default to the current task SID. */ |
| 1518 | bsec->sid = tsec->sid; |
| 1519 | |
| 1520 | /* Reset create SID on execve. */ |
| 1521 | tsec->create_sid = 0; |
| 1522 | |
| 1523 | if (tsec->exec_sid) { |
| 1524 | newsid = tsec->exec_sid; |
| 1525 | /* Reset exec SID on execve. */ |
| 1526 | tsec->exec_sid = 0; |
| 1527 | } else { |
| 1528 | /* Check for a default transition on this program. */ |
| 1529 | rc = security_transition_sid(tsec->sid, isec->sid, |
| 1530 | SECCLASS_PROCESS, &newsid); |
| 1531 | if (rc) |
| 1532 | return rc; |
| 1533 | } |
| 1534 | |
| 1535 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1536 | ad.u.fs.mnt = bprm->file->f_vfsmnt; |
| 1537 | ad.u.fs.dentry = bprm->file->f_dentry; |
| 1538 | |
| 1539 | if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID) |
| 1540 | newsid = tsec->sid; |
| 1541 | |
| 1542 | if (tsec->sid == newsid) { |
| 1543 | rc = avc_has_perm(tsec->sid, isec->sid, |
| 1544 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); |
| 1545 | if (rc) |
| 1546 | return rc; |
| 1547 | } else { |
| 1548 | /* Check permissions for the transition. */ |
| 1549 | rc = avc_has_perm(tsec->sid, newsid, |
| 1550 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); |
| 1551 | if (rc) |
| 1552 | return rc; |
| 1553 | |
| 1554 | rc = avc_has_perm(newsid, isec->sid, |
| 1555 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); |
| 1556 | if (rc) |
| 1557 | return rc; |
| 1558 | |
| 1559 | /* Clear any possibly unsafe personality bits on exec: */ |
| 1560 | current->personality &= ~PER_CLEAR_ON_SETID; |
| 1561 | |
| 1562 | /* Set the security field to the new SID. */ |
| 1563 | bsec->sid = newsid; |
| 1564 | } |
| 1565 | |
| 1566 | bsec->set = 1; |
| 1567 | return 0; |
| 1568 | } |
| 1569 | |
| 1570 | static int selinux_bprm_check_security (struct linux_binprm *bprm) |
| 1571 | { |
| 1572 | return secondary_ops->bprm_check_security(bprm); |
| 1573 | } |
| 1574 | |
| 1575 | |
| 1576 | static int selinux_bprm_secureexec (struct linux_binprm *bprm) |
| 1577 | { |
| 1578 | struct task_security_struct *tsec = current->security; |
| 1579 | int atsecure = 0; |
| 1580 | |
| 1581 | if (tsec->osid != tsec->sid) { |
| 1582 | /* Enable secure mode for SIDs transitions unless |
| 1583 | the noatsecure permission is granted between |
| 1584 | the two SIDs, i.e. ahp returns 0. */ |
| 1585 | atsecure = avc_has_perm(tsec->osid, tsec->sid, |
| 1586 | SECCLASS_PROCESS, |
| 1587 | PROCESS__NOATSECURE, NULL); |
| 1588 | } |
| 1589 | |
| 1590 | return (atsecure || secondary_ops->bprm_secureexec(bprm)); |
| 1591 | } |
| 1592 | |
| 1593 | static void selinux_bprm_free_security(struct linux_binprm *bprm) |
| 1594 | { |
Jesper Juhl | 9a5f04b | 2005-06-25 14:58:51 -0700 | [diff] [blame] | 1595 | kfree(bprm->security); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | bprm->security = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1597 | } |
| 1598 | |
| 1599 | extern struct vfsmount *selinuxfs_mount; |
| 1600 | extern struct dentry *selinux_null; |
| 1601 | |
| 1602 | /* Derived from fs/exec.c:flush_old_files. */ |
| 1603 | static inline void flush_unauthorized_files(struct files_struct * files) |
| 1604 | { |
| 1605 | struct avc_audit_data ad; |
| 1606 | struct file *file, *devnull = NULL; |
| 1607 | struct tty_struct *tty = current->signal->tty; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 1608 | struct fdtable *fdt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | long j = -1; |
| 1610 | |
| 1611 | if (tty) { |
| 1612 | file_list_lock(); |
Eric Dumazet | 2f51201 | 2005-10-30 15:02:16 -0800 | [diff] [blame] | 1613 | file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | if (file) { |
| 1615 | /* Revalidate access to controlling tty. |
| 1616 | Use inode_has_perm on the tty inode directly rather |
| 1617 | than using file_has_perm, as this particular open |
| 1618 | file may belong to another process and we are only |
| 1619 | interested in the inode-based check here. */ |
| 1620 | struct inode *inode = file->f_dentry->d_inode; |
| 1621 | if (inode_has_perm(current, inode, |
| 1622 | FILE__READ | FILE__WRITE, NULL)) { |
| 1623 | /* Reset controlling tty. */ |
| 1624 | current->signal->tty = NULL; |
| 1625 | current->signal->tty_old_pgrp = 0; |
| 1626 | } |
| 1627 | } |
| 1628 | file_list_unlock(); |
| 1629 | } |
| 1630 | |
| 1631 | /* Revalidate access to inherited open files. */ |
| 1632 | |
| 1633 | AVC_AUDIT_DATA_INIT(&ad,FS); |
| 1634 | |
| 1635 | spin_lock(&files->file_lock); |
| 1636 | for (;;) { |
| 1637 | unsigned long set, i; |
| 1638 | int fd; |
| 1639 | |
| 1640 | j++; |
| 1641 | i = j * __NFDBITS; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 1642 | fdt = files_fdtable(files); |
| 1643 | if (i >= fdt->max_fds || i >= fdt->max_fdset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | break; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 1645 | set = fdt->open_fds->fds_bits[j]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | if (!set) |
| 1647 | continue; |
| 1648 | spin_unlock(&files->file_lock); |
| 1649 | for ( ; set ; i++,set >>= 1) { |
| 1650 | if (set & 1) { |
| 1651 | file = fget(i); |
| 1652 | if (!file) |
| 1653 | continue; |
| 1654 | if (file_has_perm(current, |
| 1655 | file, |
| 1656 | file_to_av(file))) { |
| 1657 | sys_close(i); |
| 1658 | fd = get_unused_fd(); |
| 1659 | if (fd != i) { |
| 1660 | if (fd >= 0) |
| 1661 | put_unused_fd(fd); |
| 1662 | fput(file); |
| 1663 | continue; |
| 1664 | } |
| 1665 | if (devnull) { |
Nick Piggin | 095975d | 2006-01-08 01:02:19 -0800 | [diff] [blame] | 1666 | get_file(devnull); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | } else { |
| 1668 | devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR); |
| 1669 | if (!devnull) { |
| 1670 | put_unused_fd(fd); |
| 1671 | fput(file); |
| 1672 | continue; |
| 1673 | } |
| 1674 | } |
| 1675 | fd_install(fd, devnull); |
| 1676 | } |
| 1677 | fput(file); |
| 1678 | } |
| 1679 | } |
| 1680 | spin_lock(&files->file_lock); |
| 1681 | |
| 1682 | } |
| 1683 | spin_unlock(&files->file_lock); |
| 1684 | } |
| 1685 | |
| 1686 | static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) |
| 1687 | { |
| 1688 | struct task_security_struct *tsec; |
| 1689 | struct bprm_security_struct *bsec; |
| 1690 | u32 sid; |
| 1691 | int rc; |
| 1692 | |
| 1693 | secondary_ops->bprm_apply_creds(bprm, unsafe); |
| 1694 | |
| 1695 | tsec = current->security; |
| 1696 | |
| 1697 | bsec = bprm->security; |
| 1698 | sid = bsec->sid; |
| 1699 | |
| 1700 | tsec->osid = tsec->sid; |
| 1701 | bsec->unsafe = 0; |
| 1702 | if (tsec->sid != sid) { |
| 1703 | /* Check for shared state. If not ok, leave SID |
| 1704 | unchanged and kill. */ |
| 1705 | if (unsafe & LSM_UNSAFE_SHARE) { |
| 1706 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |
| 1707 | PROCESS__SHARE, NULL); |
| 1708 | if (rc) { |
| 1709 | bsec->unsafe = 1; |
| 1710 | return; |
| 1711 | } |
| 1712 | } |
| 1713 | |
| 1714 | /* Check for ptracing, and update the task SID if ok. |
| 1715 | Otherwise, leave SID unchanged and kill. */ |
| 1716 | if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
| 1717 | rc = avc_has_perm(tsec->ptrace_sid, sid, |
| 1718 | SECCLASS_PROCESS, PROCESS__PTRACE, |
| 1719 | NULL); |
| 1720 | if (rc) { |
| 1721 | bsec->unsafe = 1; |
| 1722 | return; |
| 1723 | } |
| 1724 | } |
| 1725 | tsec->sid = sid; |
| 1726 | } |
| 1727 | } |
| 1728 | |
| 1729 | /* |
| 1730 | * called after apply_creds without the task lock held |
| 1731 | */ |
| 1732 | static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm) |
| 1733 | { |
| 1734 | struct task_security_struct *tsec; |
| 1735 | struct rlimit *rlim, *initrlim; |
| 1736 | struct itimerval itimer; |
| 1737 | struct bprm_security_struct *bsec; |
| 1738 | int rc, i; |
| 1739 | |
| 1740 | tsec = current->security; |
| 1741 | bsec = bprm->security; |
| 1742 | |
| 1743 | if (bsec->unsafe) { |
| 1744 | force_sig_specific(SIGKILL, current); |
| 1745 | return; |
| 1746 | } |
| 1747 | if (tsec->osid == tsec->sid) |
| 1748 | return; |
| 1749 | |
| 1750 | /* Close files for which the new task SID is not authorized. */ |
| 1751 | flush_unauthorized_files(current->files); |
| 1752 | |
| 1753 | /* Check whether the new SID can inherit signal state |
| 1754 | from the old SID. If not, clear itimers to avoid |
| 1755 | subsequent signal generation and flush and unblock |
| 1756 | signals. This must occur _after_ the task SID has |
| 1757 | been updated so that any kill done after the flush |
| 1758 | will be checked against the new SID. */ |
| 1759 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, |
| 1760 | PROCESS__SIGINH, NULL); |
| 1761 | if (rc) { |
| 1762 | memset(&itimer, 0, sizeof itimer); |
| 1763 | for (i = 0; i < 3; i++) |
| 1764 | do_setitimer(i, &itimer, NULL); |
| 1765 | flush_signals(current); |
| 1766 | spin_lock_irq(¤t->sighand->siglock); |
| 1767 | flush_signal_handlers(current, 1); |
| 1768 | sigemptyset(¤t->blocked); |
| 1769 | recalc_sigpending(); |
| 1770 | spin_unlock_irq(¤t->sighand->siglock); |
| 1771 | } |
| 1772 | |
| 1773 | /* Check whether the new SID can inherit resource limits |
| 1774 | from the old SID. If not, reset all soft limits to |
| 1775 | the lower of the current task's hard limit and the init |
| 1776 | task's soft limit. Note that the setting of hard limits |
| 1777 | (even to lower them) can be controlled by the setrlimit |
| 1778 | check. The inclusion of the init task's soft limit into |
| 1779 | the computation is to avoid resetting soft limits higher |
| 1780 | than the default soft limit for cases where the default |
| 1781 | is lower than the hard limit, e.g. RLIMIT_CORE or |
| 1782 | RLIMIT_STACK.*/ |
| 1783 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, |
| 1784 | PROCESS__RLIMITINH, NULL); |
| 1785 | if (rc) { |
| 1786 | for (i = 0; i < RLIM_NLIMITS; i++) { |
| 1787 | rlim = current->signal->rlim + i; |
| 1788 | initrlim = init_task.signal->rlim+i; |
| 1789 | rlim->rlim_cur = min(rlim->rlim_max,initrlim->rlim_cur); |
| 1790 | } |
| 1791 | if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) { |
| 1792 | /* |
| 1793 | * This will cause RLIMIT_CPU calculations |
| 1794 | * to be refigured. |
| 1795 | */ |
| 1796 | current->it_prof_expires = jiffies_to_cputime(1); |
| 1797 | } |
| 1798 | } |
| 1799 | |
| 1800 | /* Wake up the parent if it is waiting so that it can |
| 1801 | recheck wait permission to the new task SID. */ |
| 1802 | wake_up_interruptible(¤t->parent->signal->wait_chldexit); |
| 1803 | } |
| 1804 | |
| 1805 | /* superblock security operations */ |
| 1806 | |
| 1807 | static int selinux_sb_alloc_security(struct super_block *sb) |
| 1808 | { |
| 1809 | return superblock_alloc_security(sb); |
| 1810 | } |
| 1811 | |
| 1812 | static void selinux_sb_free_security(struct super_block *sb) |
| 1813 | { |
| 1814 | superblock_free_security(sb); |
| 1815 | } |
| 1816 | |
| 1817 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) |
| 1818 | { |
| 1819 | if (plen > olen) |
| 1820 | return 0; |
| 1821 | |
| 1822 | return !memcmp(prefix, option, plen); |
| 1823 | } |
| 1824 | |
| 1825 | static inline int selinux_option(char *option, int len) |
| 1826 | { |
| 1827 | return (match_prefix("context=", sizeof("context=")-1, option, len) || |
| 1828 | match_prefix("fscontext=", sizeof("fscontext=")-1, option, len) || |
| 1829 | match_prefix("defcontext=", sizeof("defcontext=")-1, option, len)); |
| 1830 | } |
| 1831 | |
| 1832 | static inline void take_option(char **to, char *from, int *first, int len) |
| 1833 | { |
| 1834 | if (!*first) { |
| 1835 | **to = ','; |
| 1836 | *to += 1; |
| 1837 | } |
| 1838 | else |
| 1839 | *first = 0; |
| 1840 | memcpy(*to, from, len); |
| 1841 | *to += len; |
| 1842 | } |
| 1843 | |
| 1844 | static int selinux_sb_copy_data(struct file_system_type *type, void *orig, void *copy) |
| 1845 | { |
| 1846 | int fnosec, fsec, rc = 0; |
| 1847 | char *in_save, *in_curr, *in_end; |
| 1848 | char *sec_curr, *nosec_save, *nosec; |
| 1849 | |
| 1850 | in_curr = orig; |
| 1851 | sec_curr = copy; |
| 1852 | |
| 1853 | /* Binary mount data: just copy */ |
| 1854 | if (type->fs_flags & FS_BINARY_MOUNTDATA) { |
| 1855 | copy_page(sec_curr, in_curr); |
| 1856 | goto out; |
| 1857 | } |
| 1858 | |
| 1859 | nosec = (char *)get_zeroed_page(GFP_KERNEL); |
| 1860 | if (!nosec) { |
| 1861 | rc = -ENOMEM; |
| 1862 | goto out; |
| 1863 | } |
| 1864 | |
| 1865 | nosec_save = nosec; |
| 1866 | fnosec = fsec = 1; |
| 1867 | in_save = in_end = orig; |
| 1868 | |
| 1869 | do { |
| 1870 | if (*in_end == ',' || *in_end == '\0') { |
| 1871 | int len = in_end - in_curr; |
| 1872 | |
| 1873 | if (selinux_option(in_curr, len)) |
| 1874 | take_option(&sec_curr, in_curr, &fsec, len); |
| 1875 | else |
| 1876 | take_option(&nosec, in_curr, &fnosec, len); |
| 1877 | |
| 1878 | in_curr = in_end + 1; |
| 1879 | } |
| 1880 | } while (*in_end++); |
| 1881 | |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 1882 | strcpy(in_save, nosec_save); |
Gerald Schaefer | da3caa2 | 2005-06-21 17:15:18 -0700 | [diff] [blame] | 1883 | free_page((unsigned long)nosec_save); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | out: |
| 1885 | return rc; |
| 1886 | } |
| 1887 | |
| 1888 | static int selinux_sb_kern_mount(struct super_block *sb, void *data) |
| 1889 | { |
| 1890 | struct avc_audit_data ad; |
| 1891 | int rc; |
| 1892 | |
| 1893 | rc = superblock_doinit(sb, data); |
| 1894 | if (rc) |
| 1895 | return rc; |
| 1896 | |
| 1897 | AVC_AUDIT_DATA_INIT(&ad,FS); |
| 1898 | ad.u.fs.dentry = sb->s_root; |
| 1899 | return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad); |
| 1900 | } |
| 1901 | |
| 1902 | static int selinux_sb_statfs(struct super_block *sb) |
| 1903 | { |
| 1904 | struct avc_audit_data ad; |
| 1905 | |
| 1906 | AVC_AUDIT_DATA_INIT(&ad,FS); |
| 1907 | ad.u.fs.dentry = sb->s_root; |
| 1908 | return superblock_has_perm(current, sb, FILESYSTEM__GETATTR, &ad); |
| 1909 | } |
| 1910 | |
| 1911 | static int selinux_mount(char * dev_name, |
| 1912 | struct nameidata *nd, |
| 1913 | char * type, |
| 1914 | unsigned long flags, |
| 1915 | void * data) |
| 1916 | { |
| 1917 | int rc; |
| 1918 | |
| 1919 | rc = secondary_ops->sb_mount(dev_name, nd, type, flags, data); |
| 1920 | if (rc) |
| 1921 | return rc; |
| 1922 | |
| 1923 | if (flags & MS_REMOUNT) |
| 1924 | return superblock_has_perm(current, nd->mnt->mnt_sb, |
| 1925 | FILESYSTEM__REMOUNT, NULL); |
| 1926 | else |
| 1927 | return dentry_has_perm(current, nd->mnt, nd->dentry, |
| 1928 | FILE__MOUNTON); |
| 1929 | } |
| 1930 | |
| 1931 | static int selinux_umount(struct vfsmount *mnt, int flags) |
| 1932 | { |
| 1933 | int rc; |
| 1934 | |
| 1935 | rc = secondary_ops->sb_umount(mnt, flags); |
| 1936 | if (rc) |
| 1937 | return rc; |
| 1938 | |
| 1939 | return superblock_has_perm(current,mnt->mnt_sb, |
| 1940 | FILESYSTEM__UNMOUNT,NULL); |
| 1941 | } |
| 1942 | |
| 1943 | /* inode security operations */ |
| 1944 | |
| 1945 | static int selinux_inode_alloc_security(struct inode *inode) |
| 1946 | { |
| 1947 | return inode_alloc_security(inode); |
| 1948 | } |
| 1949 | |
| 1950 | static void selinux_inode_free_security(struct inode *inode) |
| 1951 | { |
| 1952 | inode_free_security(inode); |
| 1953 | } |
| 1954 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 1955 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, |
| 1956 | char **name, void **value, |
| 1957 | size_t *len) |
| 1958 | { |
| 1959 | struct task_security_struct *tsec; |
| 1960 | struct inode_security_struct *dsec; |
| 1961 | struct superblock_security_struct *sbsec; |
| 1962 | struct inode_security_struct *isec; |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 1963 | u32 newsid, clen; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 1964 | int rc; |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 1965 | char *namep = NULL, *context; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 1966 | |
| 1967 | tsec = current->security; |
| 1968 | dsec = dir->i_security; |
| 1969 | sbsec = dir->i_sb->s_security; |
| 1970 | isec = inode->i_security; |
| 1971 | |
| 1972 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { |
| 1973 | newsid = tsec->create_sid; |
| 1974 | } else { |
| 1975 | rc = security_transition_sid(tsec->sid, dsec->sid, |
| 1976 | inode_mode_to_security_class(inode->i_mode), |
| 1977 | &newsid); |
| 1978 | if (rc) { |
| 1979 | printk(KERN_WARNING "%s: " |
| 1980 | "security_transition_sid failed, rc=%d (dev=%s " |
| 1981 | "ino=%ld)\n", |
| 1982 | __FUNCTION__, |
| 1983 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 1984 | return rc; |
| 1985 | } |
| 1986 | } |
| 1987 | |
| 1988 | inode_security_set_sid(inode, newsid); |
| 1989 | |
Stephen Smalley | 25a74f3 | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 1990 | if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
| 1991 | return -EOPNOTSUPP; |
| 1992 | |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 1993 | if (name) { |
| 1994 | namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL); |
| 1995 | if (!namep) |
| 1996 | return -ENOMEM; |
| 1997 | *name = namep; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 1998 | } |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 1999 | |
| 2000 | if (value && len) { |
| 2001 | rc = security_sid_to_context(newsid, &context, &clen); |
| 2002 | if (rc) { |
| 2003 | kfree(namep); |
| 2004 | return rc; |
| 2005 | } |
| 2006 | *value = context; |
| 2007 | *len = clen; |
| 2008 | } |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2009 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2010 | return 0; |
| 2011 | } |
| 2012 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2013 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) |
| 2014 | { |
| 2015 | return may_create(dir, dentry, SECCLASS_FILE); |
| 2016 | } |
| 2017 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) |
| 2019 | { |
| 2020 | int rc; |
| 2021 | |
| 2022 | rc = secondary_ops->inode_link(old_dentry,dir,new_dentry); |
| 2023 | if (rc) |
| 2024 | return rc; |
| 2025 | return may_link(dir, old_dentry, MAY_LINK); |
| 2026 | } |
| 2027 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) |
| 2029 | { |
| 2030 | int rc; |
| 2031 | |
| 2032 | rc = secondary_ops->inode_unlink(dir, dentry); |
| 2033 | if (rc) |
| 2034 | return rc; |
| 2035 | return may_link(dir, dentry, MAY_UNLINK); |
| 2036 | } |
| 2037 | |
| 2038 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) |
| 2039 | { |
| 2040 | return may_create(dir, dentry, SECCLASS_LNK_FILE); |
| 2041 | } |
| 2042 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) |
| 2044 | { |
| 2045 | return may_create(dir, dentry, SECCLASS_DIR); |
| 2046 | } |
| 2047 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) |
| 2049 | { |
| 2050 | return may_link(dir, dentry, MAY_RMDIR); |
| 2051 | } |
| 2052 | |
| 2053 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) |
| 2054 | { |
| 2055 | int rc; |
| 2056 | |
| 2057 | rc = secondary_ops->inode_mknod(dir, dentry, mode, dev); |
| 2058 | if (rc) |
| 2059 | return rc; |
| 2060 | |
| 2061 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); |
| 2062 | } |
| 2063 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry, |
| 2065 | struct inode *new_inode, struct dentry *new_dentry) |
| 2066 | { |
| 2067 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); |
| 2068 | } |
| 2069 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | static int selinux_inode_readlink(struct dentry *dentry) |
| 2071 | { |
| 2072 | return dentry_has_perm(current, NULL, dentry, FILE__READ); |
| 2073 | } |
| 2074 | |
| 2075 | static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) |
| 2076 | { |
| 2077 | int rc; |
| 2078 | |
| 2079 | rc = secondary_ops->inode_follow_link(dentry,nameidata); |
| 2080 | if (rc) |
| 2081 | return rc; |
| 2082 | return dentry_has_perm(current, NULL, dentry, FILE__READ); |
| 2083 | } |
| 2084 | |
| 2085 | static int selinux_inode_permission(struct inode *inode, int mask, |
| 2086 | struct nameidata *nd) |
| 2087 | { |
| 2088 | int rc; |
| 2089 | |
| 2090 | rc = secondary_ops->inode_permission(inode, mask, nd); |
| 2091 | if (rc) |
| 2092 | return rc; |
| 2093 | |
| 2094 | if (!mask) { |
| 2095 | /* No permission to check. Existence test. */ |
| 2096 | return 0; |
| 2097 | } |
| 2098 | |
| 2099 | return inode_has_perm(current, inode, |
| 2100 | file_mask_to_av(inode->i_mode, mask), NULL); |
| 2101 | } |
| 2102 | |
| 2103 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) |
| 2104 | { |
| 2105 | int rc; |
| 2106 | |
| 2107 | rc = secondary_ops->inode_setattr(dentry, iattr); |
| 2108 | if (rc) |
| 2109 | return rc; |
| 2110 | |
| 2111 | if (iattr->ia_valid & ATTR_FORCE) |
| 2112 | return 0; |
| 2113 | |
| 2114 | if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | |
| 2115 | ATTR_ATIME_SET | ATTR_MTIME_SET)) |
| 2116 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); |
| 2117 | |
| 2118 | return dentry_has_perm(current, NULL, dentry, FILE__WRITE); |
| 2119 | } |
| 2120 | |
| 2121 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) |
| 2122 | { |
| 2123 | return dentry_has_perm(current, mnt, dentry, FILE__GETATTR); |
| 2124 | } |
| 2125 | |
| 2126 | static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value, size_t size, int flags) |
| 2127 | { |
| 2128 | struct task_security_struct *tsec = current->security; |
| 2129 | struct inode *inode = dentry->d_inode; |
| 2130 | struct inode_security_struct *isec = inode->i_security; |
| 2131 | struct superblock_security_struct *sbsec; |
| 2132 | struct avc_audit_data ad; |
| 2133 | u32 newsid; |
| 2134 | int rc = 0; |
| 2135 | |
| 2136 | if (strcmp(name, XATTR_NAME_SELINUX)) { |
| 2137 | if (!strncmp(name, XATTR_SECURITY_PREFIX, |
| 2138 | sizeof XATTR_SECURITY_PREFIX - 1) && |
| 2139 | !capable(CAP_SYS_ADMIN)) { |
| 2140 | /* A different attribute in the security namespace. |
| 2141 | Restrict to administrator. */ |
| 2142 | return -EPERM; |
| 2143 | } |
| 2144 | |
| 2145 | /* Not an attribute we recognize, so just check the |
| 2146 | ordinary setattr permission. */ |
| 2147 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); |
| 2148 | } |
| 2149 | |
| 2150 | sbsec = inode->i_sb->s_security; |
| 2151 | if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
| 2152 | return -EOPNOTSUPP; |
| 2153 | |
| 2154 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) |
| 2155 | return -EPERM; |
| 2156 | |
| 2157 | AVC_AUDIT_DATA_INIT(&ad,FS); |
| 2158 | ad.u.fs.dentry = dentry; |
| 2159 | |
| 2160 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, |
| 2161 | FILE__RELABELFROM, &ad); |
| 2162 | if (rc) |
| 2163 | return rc; |
| 2164 | |
| 2165 | rc = security_context_to_sid(value, size, &newsid); |
| 2166 | if (rc) |
| 2167 | return rc; |
| 2168 | |
| 2169 | rc = avc_has_perm(tsec->sid, newsid, isec->sclass, |
| 2170 | FILE__RELABELTO, &ad); |
| 2171 | if (rc) |
| 2172 | return rc; |
| 2173 | |
| 2174 | rc = security_validate_transition(isec->sid, newsid, tsec->sid, |
| 2175 | isec->sclass); |
| 2176 | if (rc) |
| 2177 | return rc; |
| 2178 | |
| 2179 | return avc_has_perm(newsid, |
| 2180 | sbsec->sid, |
| 2181 | SECCLASS_FILESYSTEM, |
| 2182 | FILESYSTEM__ASSOCIATE, |
| 2183 | &ad); |
| 2184 | } |
| 2185 | |
| 2186 | static void selinux_inode_post_setxattr(struct dentry *dentry, char *name, |
| 2187 | void *value, size_t size, int flags) |
| 2188 | { |
| 2189 | struct inode *inode = dentry->d_inode; |
| 2190 | struct inode_security_struct *isec = inode->i_security; |
| 2191 | u32 newsid; |
| 2192 | int rc; |
| 2193 | |
| 2194 | if (strcmp(name, XATTR_NAME_SELINUX)) { |
| 2195 | /* Not an attribute we recognize, so nothing to do. */ |
| 2196 | return; |
| 2197 | } |
| 2198 | |
| 2199 | rc = security_context_to_sid(value, size, &newsid); |
| 2200 | if (rc) { |
| 2201 | printk(KERN_WARNING "%s: unable to obtain SID for context " |
| 2202 | "%s, rc=%d\n", __FUNCTION__, (char*)value, -rc); |
| 2203 | return; |
| 2204 | } |
| 2205 | |
| 2206 | isec->sid = newsid; |
| 2207 | return; |
| 2208 | } |
| 2209 | |
| 2210 | static int selinux_inode_getxattr (struct dentry *dentry, char *name) |
| 2211 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2212 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); |
| 2213 | } |
| 2214 | |
| 2215 | static int selinux_inode_listxattr (struct dentry *dentry) |
| 2216 | { |
| 2217 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); |
| 2218 | } |
| 2219 | |
| 2220 | static int selinux_inode_removexattr (struct dentry *dentry, char *name) |
| 2221 | { |
| 2222 | if (strcmp(name, XATTR_NAME_SELINUX)) { |
| 2223 | if (!strncmp(name, XATTR_SECURITY_PREFIX, |
| 2224 | sizeof XATTR_SECURITY_PREFIX - 1) && |
| 2225 | !capable(CAP_SYS_ADMIN)) { |
| 2226 | /* A different attribute in the security namespace. |
| 2227 | Restrict to administrator. */ |
| 2228 | return -EPERM; |
| 2229 | } |
| 2230 | |
| 2231 | /* Not an attribute we recognize, so just check the |
| 2232 | ordinary setattr permission. Might want a separate |
| 2233 | permission for removexattr. */ |
| 2234 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); |
| 2235 | } |
| 2236 | |
| 2237 | /* No one is allowed to remove a SELinux security label. |
| 2238 | You can change the label, but all data must be labeled. */ |
| 2239 | return -EACCES; |
| 2240 | } |
| 2241 | |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2242 | /* |
| 2243 | * Copy the in-core inode security context value to the user. If the |
| 2244 | * getxattr() prior to this succeeded, check to see if we need to |
| 2245 | * canonicalize the value to be finally returned to the user. |
| 2246 | * |
| 2247 | * Permission check is handled by selinux_inode_getxattr hook. |
| 2248 | */ |
| 2249 | static int selinux_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size, int err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | { |
| 2251 | struct inode_security_struct *isec = inode->i_security; |
| 2252 | char *context; |
| 2253 | unsigned len; |
| 2254 | int rc; |
| 2255 | |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2256 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) { |
| 2257 | rc = -EOPNOTSUPP; |
| 2258 | goto out; |
| 2259 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | |
| 2261 | rc = security_sid_to_context(isec->sid, &context, &len); |
| 2262 | if (rc) |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2263 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2265 | /* Probe for required buffer size */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | if (!buffer || !size) { |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2267 | rc = len; |
| 2268 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | } |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | if (size < len) { |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2272 | rc = -ERANGE; |
| 2273 | goto out_free; |
| 2274 | } |
| 2275 | |
| 2276 | if (err > 0) { |
| 2277 | if ((len == err) && !(memcmp(context, buffer, len))) { |
| 2278 | /* Don't need to canonicalize value */ |
| 2279 | rc = err; |
| 2280 | goto out_free; |
| 2281 | } |
| 2282 | memset(buffer, 0, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2283 | } |
| 2284 | memcpy(buffer, context, len); |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2285 | rc = len; |
| 2286 | out_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | kfree(context); |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2288 | out: |
| 2289 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | } |
| 2291 | |
| 2292 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, |
| 2293 | const void *value, size_t size, int flags) |
| 2294 | { |
| 2295 | struct inode_security_struct *isec = inode->i_security; |
| 2296 | u32 newsid; |
| 2297 | int rc; |
| 2298 | |
| 2299 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 2300 | return -EOPNOTSUPP; |
| 2301 | |
| 2302 | if (!value || !size) |
| 2303 | return -EACCES; |
| 2304 | |
| 2305 | rc = security_context_to_sid((void*)value, size, &newsid); |
| 2306 | if (rc) |
| 2307 | return rc; |
| 2308 | |
| 2309 | isec->sid = newsid; |
| 2310 | return 0; |
| 2311 | } |
| 2312 | |
| 2313 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) |
| 2314 | { |
| 2315 | const int len = sizeof(XATTR_NAME_SELINUX); |
| 2316 | if (buffer && len <= buffer_size) |
| 2317 | memcpy(buffer, XATTR_NAME_SELINUX, len); |
| 2318 | return len; |
| 2319 | } |
| 2320 | |
| 2321 | /* file security operations */ |
| 2322 | |
| 2323 | static int selinux_file_permission(struct file *file, int mask) |
| 2324 | { |
| 2325 | struct inode *inode = file->f_dentry->d_inode; |
| 2326 | |
| 2327 | if (!mask) { |
| 2328 | /* No permission to check. Existence test. */ |
| 2329 | return 0; |
| 2330 | } |
| 2331 | |
| 2332 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ |
| 2333 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) |
| 2334 | mask |= MAY_APPEND; |
| 2335 | |
| 2336 | return file_has_perm(current, file, |
| 2337 | file_mask_to_av(inode->i_mode, mask)); |
| 2338 | } |
| 2339 | |
| 2340 | static int selinux_file_alloc_security(struct file *file) |
| 2341 | { |
| 2342 | return file_alloc_security(file); |
| 2343 | } |
| 2344 | |
| 2345 | static void selinux_file_free_security(struct file *file) |
| 2346 | { |
| 2347 | file_free_security(file); |
| 2348 | } |
| 2349 | |
| 2350 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, |
| 2351 | unsigned long arg) |
| 2352 | { |
| 2353 | int error = 0; |
| 2354 | |
| 2355 | switch (cmd) { |
| 2356 | case FIONREAD: |
| 2357 | /* fall through */ |
| 2358 | case FIBMAP: |
| 2359 | /* fall through */ |
| 2360 | case FIGETBSZ: |
| 2361 | /* fall through */ |
| 2362 | case EXT2_IOC_GETFLAGS: |
| 2363 | /* fall through */ |
| 2364 | case EXT2_IOC_GETVERSION: |
| 2365 | error = file_has_perm(current, file, FILE__GETATTR); |
| 2366 | break; |
| 2367 | |
| 2368 | case EXT2_IOC_SETFLAGS: |
| 2369 | /* fall through */ |
| 2370 | case EXT2_IOC_SETVERSION: |
| 2371 | error = file_has_perm(current, file, FILE__SETATTR); |
| 2372 | break; |
| 2373 | |
| 2374 | /* sys_ioctl() checks */ |
| 2375 | case FIONBIO: |
| 2376 | /* fall through */ |
| 2377 | case FIOASYNC: |
| 2378 | error = file_has_perm(current, file, 0); |
| 2379 | break; |
| 2380 | |
| 2381 | case KDSKBENT: |
| 2382 | case KDSKBSENT: |
| 2383 | error = task_has_capability(current,CAP_SYS_TTY_CONFIG); |
| 2384 | break; |
| 2385 | |
| 2386 | /* default case assumes that the command will go |
| 2387 | * to the file's ioctl() function. |
| 2388 | */ |
| 2389 | default: |
| 2390 | error = file_has_perm(current, file, FILE__IOCTL); |
| 2391 | |
| 2392 | } |
| 2393 | return error; |
| 2394 | } |
| 2395 | |
| 2396 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) |
| 2397 | { |
| 2398 | #ifndef CONFIG_PPC32 |
| 2399 | if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { |
| 2400 | /* |
| 2401 | * We are making executable an anonymous mapping or a |
| 2402 | * private file mapping that will also be writable. |
| 2403 | * This has an additional check. |
| 2404 | */ |
| 2405 | int rc = task_has_perm(current, current, PROCESS__EXECMEM); |
| 2406 | if (rc) |
| 2407 | return rc; |
| 2408 | } |
| 2409 | #endif |
| 2410 | |
| 2411 | if (file) { |
| 2412 | /* read access is always possible with a mapping */ |
| 2413 | u32 av = FILE__READ; |
| 2414 | |
| 2415 | /* write access only matters if the mapping is shared */ |
| 2416 | if (shared && (prot & PROT_WRITE)) |
| 2417 | av |= FILE__WRITE; |
| 2418 | |
| 2419 | if (prot & PROT_EXEC) |
| 2420 | av |= FILE__EXECUTE; |
| 2421 | |
| 2422 | return file_has_perm(current, file, av); |
| 2423 | } |
| 2424 | return 0; |
| 2425 | } |
| 2426 | |
| 2427 | static int selinux_file_mmap(struct file *file, unsigned long reqprot, |
| 2428 | unsigned long prot, unsigned long flags) |
| 2429 | { |
| 2430 | int rc; |
| 2431 | |
| 2432 | rc = secondary_ops->file_mmap(file, reqprot, prot, flags); |
| 2433 | if (rc) |
| 2434 | return rc; |
| 2435 | |
| 2436 | if (selinux_checkreqprot) |
| 2437 | prot = reqprot; |
| 2438 | |
| 2439 | return file_map_prot_check(file, prot, |
| 2440 | (flags & MAP_TYPE) == MAP_SHARED); |
| 2441 | } |
| 2442 | |
| 2443 | static int selinux_file_mprotect(struct vm_area_struct *vma, |
| 2444 | unsigned long reqprot, |
| 2445 | unsigned long prot) |
| 2446 | { |
| 2447 | int rc; |
| 2448 | |
| 2449 | rc = secondary_ops->file_mprotect(vma, reqprot, prot); |
| 2450 | if (rc) |
| 2451 | return rc; |
| 2452 | |
| 2453 | if (selinux_checkreqprot) |
| 2454 | prot = reqprot; |
| 2455 | |
| 2456 | #ifndef CONFIG_PPC32 |
Lorenzo Hernández GarcÃa-Hierro | 09ffd94f | 2005-06-25 14:54:35 -0700 | [diff] [blame] | 2457 | if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXECUTABLE) && |
| 2458 | (vma->vm_start >= vma->vm_mm->start_brk && |
| 2459 | vma->vm_end <= vma->vm_mm->brk)) { |
| 2460 | /* |
| 2461 | * We are making an executable mapping in the brk region. |
| 2462 | * This has an additional execheap check. |
| 2463 | */ |
| 2464 | rc = task_has_perm(current, current, PROCESS__EXECHEAP); |
| 2465 | if (rc) |
| 2466 | return rc; |
| 2467 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | if (vma->vm_file != NULL && vma->anon_vma != NULL && (prot & PROT_EXEC)) { |
| 2469 | /* |
| 2470 | * We are making executable a file mapping that has |
| 2471 | * had some COW done. Since pages might have been written, |
| 2472 | * check ability to execute the possibly modified content. |
| 2473 | * This typically should only occur for text relocations. |
| 2474 | */ |
| 2475 | int rc = file_has_perm(current, vma->vm_file, FILE__EXECMOD); |
| 2476 | if (rc) |
| 2477 | return rc; |
| 2478 | } |
Lorenzo Hernandez GarcÃa-Hierro | 6b99219 | 2005-06-25 14:54:34 -0700 | [diff] [blame] | 2479 | if (!vma->vm_file && (prot & PROT_EXEC) && |
| 2480 | vma->vm_start <= vma->vm_mm->start_stack && |
| 2481 | vma->vm_end >= vma->vm_mm->start_stack) { |
| 2482 | /* Attempt to make the process stack executable. |
| 2483 | * This has an additional execstack check. |
| 2484 | */ |
| 2485 | rc = task_has_perm(current, current, PROCESS__EXECSTACK); |
| 2486 | if (rc) |
| 2487 | return rc; |
| 2488 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2489 | #endif |
| 2490 | |
| 2491 | return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED); |
| 2492 | } |
| 2493 | |
| 2494 | static int selinux_file_lock(struct file *file, unsigned int cmd) |
| 2495 | { |
| 2496 | return file_has_perm(current, file, FILE__LOCK); |
| 2497 | } |
| 2498 | |
| 2499 | static int selinux_file_fcntl(struct file *file, unsigned int cmd, |
| 2500 | unsigned long arg) |
| 2501 | { |
| 2502 | int err = 0; |
| 2503 | |
| 2504 | switch (cmd) { |
| 2505 | case F_SETFL: |
| 2506 | if (!file->f_dentry || !file->f_dentry->d_inode) { |
| 2507 | err = -EINVAL; |
| 2508 | break; |
| 2509 | } |
| 2510 | |
| 2511 | if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) { |
| 2512 | err = file_has_perm(current, file,FILE__WRITE); |
| 2513 | break; |
| 2514 | } |
| 2515 | /* fall through */ |
| 2516 | case F_SETOWN: |
| 2517 | case F_SETSIG: |
| 2518 | case F_GETFL: |
| 2519 | case F_GETOWN: |
| 2520 | case F_GETSIG: |
| 2521 | /* Just check FD__USE permission */ |
| 2522 | err = file_has_perm(current, file, 0); |
| 2523 | break; |
| 2524 | case F_GETLK: |
| 2525 | case F_SETLK: |
| 2526 | case F_SETLKW: |
| 2527 | #if BITS_PER_LONG == 32 |
| 2528 | case F_GETLK64: |
| 2529 | case F_SETLK64: |
| 2530 | case F_SETLKW64: |
| 2531 | #endif |
| 2532 | if (!file->f_dentry || !file->f_dentry->d_inode) { |
| 2533 | err = -EINVAL; |
| 2534 | break; |
| 2535 | } |
| 2536 | err = file_has_perm(current, file, FILE__LOCK); |
| 2537 | break; |
| 2538 | } |
| 2539 | |
| 2540 | return err; |
| 2541 | } |
| 2542 | |
| 2543 | static int selinux_file_set_fowner(struct file *file) |
| 2544 | { |
| 2545 | struct task_security_struct *tsec; |
| 2546 | struct file_security_struct *fsec; |
| 2547 | |
| 2548 | tsec = current->security; |
| 2549 | fsec = file->f_security; |
| 2550 | fsec->fown_sid = tsec->sid; |
| 2551 | |
| 2552 | return 0; |
| 2553 | } |
| 2554 | |
| 2555 | static int selinux_file_send_sigiotask(struct task_struct *tsk, |
| 2556 | struct fown_struct *fown, int signum) |
| 2557 | { |
| 2558 | struct file *file; |
| 2559 | u32 perm; |
| 2560 | struct task_security_struct *tsec; |
| 2561 | struct file_security_struct *fsec; |
| 2562 | |
| 2563 | /* struct fown_struct is never outside the context of a struct file */ |
| 2564 | file = (struct file *)((long)fown - offsetof(struct file,f_owner)); |
| 2565 | |
| 2566 | tsec = tsk->security; |
| 2567 | fsec = file->f_security; |
| 2568 | |
| 2569 | if (!signum) |
| 2570 | perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */ |
| 2571 | else |
| 2572 | perm = signal_to_av(signum); |
| 2573 | |
| 2574 | return avc_has_perm(fsec->fown_sid, tsec->sid, |
| 2575 | SECCLASS_PROCESS, perm, NULL); |
| 2576 | } |
| 2577 | |
| 2578 | static int selinux_file_receive(struct file *file) |
| 2579 | { |
| 2580 | return file_has_perm(current, file, file_to_av(file)); |
| 2581 | } |
| 2582 | |
| 2583 | /* task security operations */ |
| 2584 | |
| 2585 | static int selinux_task_create(unsigned long clone_flags) |
| 2586 | { |
| 2587 | int rc; |
| 2588 | |
| 2589 | rc = secondary_ops->task_create(clone_flags); |
| 2590 | if (rc) |
| 2591 | return rc; |
| 2592 | |
| 2593 | return task_has_perm(current, current, PROCESS__FORK); |
| 2594 | } |
| 2595 | |
| 2596 | static int selinux_task_alloc_security(struct task_struct *tsk) |
| 2597 | { |
| 2598 | struct task_security_struct *tsec1, *tsec2; |
| 2599 | int rc; |
| 2600 | |
| 2601 | tsec1 = current->security; |
| 2602 | |
| 2603 | rc = task_alloc_security(tsk); |
| 2604 | if (rc) |
| 2605 | return rc; |
| 2606 | tsec2 = tsk->security; |
| 2607 | |
| 2608 | tsec2->osid = tsec1->osid; |
| 2609 | tsec2->sid = tsec1->sid; |
| 2610 | |
| 2611 | /* Retain the exec and create SIDs across fork */ |
| 2612 | tsec2->exec_sid = tsec1->exec_sid; |
| 2613 | tsec2->create_sid = tsec1->create_sid; |
| 2614 | |
| 2615 | /* Retain ptracer SID across fork, if any. |
| 2616 | This will be reset by the ptrace hook upon any |
| 2617 | subsequent ptrace_attach operations. */ |
| 2618 | tsec2->ptrace_sid = tsec1->ptrace_sid; |
| 2619 | |
| 2620 | return 0; |
| 2621 | } |
| 2622 | |
| 2623 | static void selinux_task_free_security(struct task_struct *tsk) |
| 2624 | { |
| 2625 | task_free_security(tsk); |
| 2626 | } |
| 2627 | |
| 2628 | static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) |
| 2629 | { |
| 2630 | /* Since setuid only affects the current process, and |
| 2631 | since the SELinux controls are not based on the Linux |
| 2632 | identity attributes, SELinux does not need to control |
| 2633 | this operation. However, SELinux does control the use |
| 2634 | of the CAP_SETUID and CAP_SETGID capabilities using the |
| 2635 | capable hook. */ |
| 2636 | return 0; |
| 2637 | } |
| 2638 | |
| 2639 | static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) |
| 2640 | { |
| 2641 | return secondary_ops->task_post_setuid(id0,id1,id2,flags); |
| 2642 | } |
| 2643 | |
| 2644 | static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags) |
| 2645 | { |
| 2646 | /* See the comment for setuid above. */ |
| 2647 | return 0; |
| 2648 | } |
| 2649 | |
| 2650 | static int selinux_task_setpgid(struct task_struct *p, pid_t pgid) |
| 2651 | { |
| 2652 | return task_has_perm(current, p, PROCESS__SETPGID); |
| 2653 | } |
| 2654 | |
| 2655 | static int selinux_task_getpgid(struct task_struct *p) |
| 2656 | { |
| 2657 | return task_has_perm(current, p, PROCESS__GETPGID); |
| 2658 | } |
| 2659 | |
| 2660 | static int selinux_task_getsid(struct task_struct *p) |
| 2661 | { |
| 2662 | return task_has_perm(current, p, PROCESS__GETSESSION); |
| 2663 | } |
| 2664 | |
| 2665 | static int selinux_task_setgroups(struct group_info *group_info) |
| 2666 | { |
| 2667 | /* See the comment for setuid above. */ |
| 2668 | return 0; |
| 2669 | } |
| 2670 | |
| 2671 | static int selinux_task_setnice(struct task_struct *p, int nice) |
| 2672 | { |
| 2673 | int rc; |
| 2674 | |
| 2675 | rc = secondary_ops->task_setnice(p, nice); |
| 2676 | if (rc) |
| 2677 | return rc; |
| 2678 | |
| 2679 | return task_has_perm(current,p, PROCESS__SETSCHED); |
| 2680 | } |
| 2681 | |
| 2682 | static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim) |
| 2683 | { |
| 2684 | struct rlimit *old_rlim = current->signal->rlim + resource; |
| 2685 | int rc; |
| 2686 | |
| 2687 | rc = secondary_ops->task_setrlimit(resource, new_rlim); |
| 2688 | if (rc) |
| 2689 | return rc; |
| 2690 | |
| 2691 | /* Control the ability to change the hard limit (whether |
| 2692 | lowering or raising it), so that the hard limit can |
| 2693 | later be used as a safe reset point for the soft limit |
| 2694 | upon context transitions. See selinux_bprm_apply_creds. */ |
| 2695 | if (old_rlim->rlim_max != new_rlim->rlim_max) |
| 2696 | return task_has_perm(current, current, PROCESS__SETRLIMIT); |
| 2697 | |
| 2698 | return 0; |
| 2699 | } |
| 2700 | |
| 2701 | static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp) |
| 2702 | { |
| 2703 | return task_has_perm(current, p, PROCESS__SETSCHED); |
| 2704 | } |
| 2705 | |
| 2706 | static int selinux_task_getscheduler(struct task_struct *p) |
| 2707 | { |
| 2708 | return task_has_perm(current, p, PROCESS__GETSCHED); |
| 2709 | } |
| 2710 | |
| 2711 | static int selinux_task_kill(struct task_struct *p, struct siginfo *info, int sig) |
| 2712 | { |
| 2713 | u32 perm; |
| 2714 | int rc; |
| 2715 | |
| 2716 | rc = secondary_ops->task_kill(p, info, sig); |
| 2717 | if (rc) |
| 2718 | return rc; |
| 2719 | |
Oleg Nesterov | 621d312 | 2005-10-30 15:03:45 -0800 | [diff] [blame] | 2720 | if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2721 | return 0; |
| 2722 | |
| 2723 | if (!sig) |
| 2724 | perm = PROCESS__SIGNULL; /* null signal; existence test */ |
| 2725 | else |
| 2726 | perm = signal_to_av(sig); |
| 2727 | |
| 2728 | return task_has_perm(current, p, perm); |
| 2729 | } |
| 2730 | |
| 2731 | static int selinux_task_prctl(int option, |
| 2732 | unsigned long arg2, |
| 2733 | unsigned long arg3, |
| 2734 | unsigned long arg4, |
| 2735 | unsigned long arg5) |
| 2736 | { |
| 2737 | /* The current prctl operations do not appear to require |
| 2738 | any SELinux controls since they merely observe or modify |
| 2739 | the state of the current process. */ |
| 2740 | return 0; |
| 2741 | } |
| 2742 | |
| 2743 | static int selinux_task_wait(struct task_struct *p) |
| 2744 | { |
| 2745 | u32 perm; |
| 2746 | |
| 2747 | perm = signal_to_av(p->exit_signal); |
| 2748 | |
| 2749 | return task_has_perm(p, current, perm); |
| 2750 | } |
| 2751 | |
| 2752 | static void selinux_task_reparent_to_init(struct task_struct *p) |
| 2753 | { |
| 2754 | struct task_security_struct *tsec; |
| 2755 | |
| 2756 | secondary_ops->task_reparent_to_init(p); |
| 2757 | |
| 2758 | tsec = p->security; |
| 2759 | tsec->osid = tsec->sid; |
| 2760 | tsec->sid = SECINITSID_KERNEL; |
| 2761 | return; |
| 2762 | } |
| 2763 | |
| 2764 | static void selinux_task_to_inode(struct task_struct *p, |
| 2765 | struct inode *inode) |
| 2766 | { |
| 2767 | struct task_security_struct *tsec = p->security; |
| 2768 | struct inode_security_struct *isec = inode->i_security; |
| 2769 | |
| 2770 | isec->sid = tsec->sid; |
| 2771 | isec->initialized = 1; |
| 2772 | return; |
| 2773 | } |
| 2774 | |
| 2775 | #ifdef CONFIG_SECURITY_NETWORK |
| 2776 | |
| 2777 | /* Returns error only if unable to parse addresses */ |
| 2778 | static int selinux_parse_skb_ipv4(struct sk_buff *skb, struct avc_audit_data *ad) |
| 2779 | { |
| 2780 | int offset, ihlen, ret = -EINVAL; |
| 2781 | struct iphdr _iph, *ih; |
| 2782 | |
| 2783 | offset = skb->nh.raw - skb->data; |
| 2784 | ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph); |
| 2785 | if (ih == NULL) |
| 2786 | goto out; |
| 2787 | |
| 2788 | ihlen = ih->ihl * 4; |
| 2789 | if (ihlen < sizeof(_iph)) |
| 2790 | goto out; |
| 2791 | |
| 2792 | ad->u.net.v4info.saddr = ih->saddr; |
| 2793 | ad->u.net.v4info.daddr = ih->daddr; |
| 2794 | ret = 0; |
| 2795 | |
| 2796 | switch (ih->protocol) { |
| 2797 | case IPPROTO_TCP: { |
| 2798 | struct tcphdr _tcph, *th; |
| 2799 | |
| 2800 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 2801 | break; |
| 2802 | |
| 2803 | offset += ihlen; |
| 2804 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 2805 | if (th == NULL) |
| 2806 | break; |
| 2807 | |
| 2808 | ad->u.net.sport = th->source; |
| 2809 | ad->u.net.dport = th->dest; |
| 2810 | break; |
| 2811 | } |
| 2812 | |
| 2813 | case IPPROTO_UDP: { |
| 2814 | struct udphdr _udph, *uh; |
| 2815 | |
| 2816 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 2817 | break; |
| 2818 | |
| 2819 | offset += ihlen; |
| 2820 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 2821 | if (uh == NULL) |
| 2822 | break; |
| 2823 | |
| 2824 | ad->u.net.sport = uh->source; |
| 2825 | ad->u.net.dport = uh->dest; |
| 2826 | break; |
| 2827 | } |
| 2828 | |
| 2829 | default: |
| 2830 | break; |
| 2831 | } |
| 2832 | out: |
| 2833 | return ret; |
| 2834 | } |
| 2835 | |
| 2836 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 2837 | |
| 2838 | /* Returns error only if unable to parse addresses */ |
| 2839 | static int selinux_parse_skb_ipv6(struct sk_buff *skb, struct avc_audit_data *ad) |
| 2840 | { |
| 2841 | u8 nexthdr; |
| 2842 | int ret = -EINVAL, offset; |
| 2843 | struct ipv6hdr _ipv6h, *ip6; |
| 2844 | |
| 2845 | offset = skb->nh.raw - skb->data; |
| 2846 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); |
| 2847 | if (ip6 == NULL) |
| 2848 | goto out; |
| 2849 | |
| 2850 | ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr); |
| 2851 | ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr); |
| 2852 | ret = 0; |
| 2853 | |
| 2854 | nexthdr = ip6->nexthdr; |
| 2855 | offset += sizeof(_ipv6h); |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 2856 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2857 | if (offset < 0) |
| 2858 | goto out; |
| 2859 | |
| 2860 | switch (nexthdr) { |
| 2861 | case IPPROTO_TCP: { |
| 2862 | struct tcphdr _tcph, *th; |
| 2863 | |
| 2864 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 2865 | if (th == NULL) |
| 2866 | break; |
| 2867 | |
| 2868 | ad->u.net.sport = th->source; |
| 2869 | ad->u.net.dport = th->dest; |
| 2870 | break; |
| 2871 | } |
| 2872 | |
| 2873 | case IPPROTO_UDP: { |
| 2874 | struct udphdr _udph, *uh; |
| 2875 | |
| 2876 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 2877 | if (uh == NULL) |
| 2878 | break; |
| 2879 | |
| 2880 | ad->u.net.sport = uh->source; |
| 2881 | ad->u.net.dport = uh->dest; |
| 2882 | break; |
| 2883 | } |
| 2884 | |
| 2885 | /* includes fragments */ |
| 2886 | default: |
| 2887 | break; |
| 2888 | } |
| 2889 | out: |
| 2890 | return ret; |
| 2891 | } |
| 2892 | |
| 2893 | #endif /* IPV6 */ |
| 2894 | |
| 2895 | static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad, |
| 2896 | char **addrp, int *len, int src) |
| 2897 | { |
| 2898 | int ret = 0; |
| 2899 | |
| 2900 | switch (ad->u.net.family) { |
| 2901 | case PF_INET: |
| 2902 | ret = selinux_parse_skb_ipv4(skb, ad); |
| 2903 | if (ret || !addrp) |
| 2904 | break; |
| 2905 | *len = 4; |
| 2906 | *addrp = (char *)(src ? &ad->u.net.v4info.saddr : |
| 2907 | &ad->u.net.v4info.daddr); |
| 2908 | break; |
| 2909 | |
| 2910 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 2911 | case PF_INET6: |
| 2912 | ret = selinux_parse_skb_ipv6(skb, ad); |
| 2913 | if (ret || !addrp) |
| 2914 | break; |
| 2915 | *len = 16; |
| 2916 | *addrp = (char *)(src ? &ad->u.net.v6info.saddr : |
| 2917 | &ad->u.net.v6info.daddr); |
| 2918 | break; |
| 2919 | #endif /* IPV6 */ |
| 2920 | default: |
| 2921 | break; |
| 2922 | } |
| 2923 | |
| 2924 | return ret; |
| 2925 | } |
| 2926 | |
| 2927 | /* socket security operations */ |
| 2928 | static int socket_has_perm(struct task_struct *task, struct socket *sock, |
| 2929 | u32 perms) |
| 2930 | { |
| 2931 | struct inode_security_struct *isec; |
| 2932 | struct task_security_struct *tsec; |
| 2933 | struct avc_audit_data ad; |
| 2934 | int err = 0; |
| 2935 | |
| 2936 | tsec = task->security; |
| 2937 | isec = SOCK_INODE(sock)->i_security; |
| 2938 | |
| 2939 | if (isec->sid == SECINITSID_KERNEL) |
| 2940 | goto out; |
| 2941 | |
| 2942 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 2943 | ad.u.net.sk = sock->sk; |
| 2944 | err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad); |
| 2945 | |
| 2946 | out: |
| 2947 | return err; |
| 2948 | } |
| 2949 | |
| 2950 | static int selinux_socket_create(int family, int type, |
| 2951 | int protocol, int kern) |
| 2952 | { |
| 2953 | int err = 0; |
| 2954 | struct task_security_struct *tsec; |
| 2955 | |
| 2956 | if (kern) |
| 2957 | goto out; |
| 2958 | |
| 2959 | tsec = current->security; |
| 2960 | err = avc_has_perm(tsec->sid, tsec->sid, |
| 2961 | socket_type_to_security_class(family, type, |
| 2962 | protocol), SOCKET__CREATE, NULL); |
| 2963 | |
| 2964 | out: |
| 2965 | return err; |
| 2966 | } |
| 2967 | |
| 2968 | static void selinux_socket_post_create(struct socket *sock, int family, |
| 2969 | int type, int protocol, int kern) |
| 2970 | { |
| 2971 | struct inode_security_struct *isec; |
| 2972 | struct task_security_struct *tsec; |
| 2973 | |
| 2974 | isec = SOCK_INODE(sock)->i_security; |
| 2975 | |
| 2976 | tsec = current->security; |
| 2977 | isec->sclass = socket_type_to_security_class(family, type, protocol); |
| 2978 | isec->sid = kern ? SECINITSID_KERNEL : tsec->sid; |
| 2979 | isec->initialized = 1; |
| 2980 | |
| 2981 | return; |
| 2982 | } |
| 2983 | |
| 2984 | /* Range of port numbers used to automatically bind. |
| 2985 | Need to determine whether we should perform a name_bind |
| 2986 | permission check between the socket and the port number. */ |
| 2987 | #define ip_local_port_range_0 sysctl_local_port_range[0] |
| 2988 | #define ip_local_port_range_1 sysctl_local_port_range[1] |
| 2989 | |
| 2990 | static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) |
| 2991 | { |
| 2992 | u16 family; |
| 2993 | int err; |
| 2994 | |
| 2995 | err = socket_has_perm(current, sock, SOCKET__BIND); |
| 2996 | if (err) |
| 2997 | goto out; |
| 2998 | |
| 2999 | /* |
| 3000 | * If PF_INET or PF_INET6, check name_bind permission for the port. |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3001 | * Multiple address binding for SCTP is not supported yet: we just |
| 3002 | * check the first address now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3003 | */ |
| 3004 | family = sock->sk->sk_family; |
| 3005 | if (family == PF_INET || family == PF_INET6) { |
| 3006 | char *addrp; |
| 3007 | struct inode_security_struct *isec; |
| 3008 | struct task_security_struct *tsec; |
| 3009 | struct avc_audit_data ad; |
| 3010 | struct sockaddr_in *addr4 = NULL; |
| 3011 | struct sockaddr_in6 *addr6 = NULL; |
| 3012 | unsigned short snum; |
| 3013 | struct sock *sk = sock->sk; |
| 3014 | u32 sid, node_perm, addrlen; |
| 3015 | |
| 3016 | tsec = current->security; |
| 3017 | isec = SOCK_INODE(sock)->i_security; |
| 3018 | |
| 3019 | if (family == PF_INET) { |
| 3020 | addr4 = (struct sockaddr_in *)address; |
| 3021 | snum = ntohs(addr4->sin_port); |
| 3022 | addrlen = sizeof(addr4->sin_addr.s_addr); |
| 3023 | addrp = (char *)&addr4->sin_addr.s_addr; |
| 3024 | } else { |
| 3025 | addr6 = (struct sockaddr_in6 *)address; |
| 3026 | snum = ntohs(addr6->sin6_port); |
| 3027 | addrlen = sizeof(addr6->sin6_addr.s6_addr); |
| 3028 | addrp = (char *)&addr6->sin6_addr.s6_addr; |
| 3029 | } |
| 3030 | |
| 3031 | if (snum&&(snum < max(PROT_SOCK,ip_local_port_range_0) || |
| 3032 | snum > ip_local_port_range_1)) { |
| 3033 | err = security_port_sid(sk->sk_family, sk->sk_type, |
| 3034 | sk->sk_protocol, snum, &sid); |
| 3035 | if (err) |
| 3036 | goto out; |
| 3037 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 3038 | ad.u.net.sport = htons(snum); |
| 3039 | ad.u.net.family = family; |
| 3040 | err = avc_has_perm(isec->sid, sid, |
| 3041 | isec->sclass, |
| 3042 | SOCKET__NAME_BIND, &ad); |
| 3043 | if (err) |
| 3044 | goto out; |
| 3045 | } |
| 3046 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3047 | switch(isec->sclass) { |
| 3048 | case SECCLASS_TCP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3049 | node_perm = TCP_SOCKET__NODE_BIND; |
| 3050 | break; |
| 3051 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3052 | case SECCLASS_UDP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3053 | node_perm = UDP_SOCKET__NODE_BIND; |
| 3054 | break; |
| 3055 | |
| 3056 | default: |
| 3057 | node_perm = RAWIP_SOCKET__NODE_BIND; |
| 3058 | break; |
| 3059 | } |
| 3060 | |
| 3061 | err = security_node_sid(family, addrp, addrlen, &sid); |
| 3062 | if (err) |
| 3063 | goto out; |
| 3064 | |
| 3065 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 3066 | ad.u.net.sport = htons(snum); |
| 3067 | ad.u.net.family = family; |
| 3068 | |
| 3069 | if (family == PF_INET) |
| 3070 | ad.u.net.v4info.saddr = addr4->sin_addr.s_addr; |
| 3071 | else |
| 3072 | ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr); |
| 3073 | |
| 3074 | err = avc_has_perm(isec->sid, sid, |
| 3075 | isec->sclass, node_perm, &ad); |
| 3076 | if (err) |
| 3077 | goto out; |
| 3078 | } |
| 3079 | out: |
| 3080 | return err; |
| 3081 | } |
| 3082 | |
| 3083 | static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) |
| 3084 | { |
| 3085 | struct inode_security_struct *isec; |
| 3086 | int err; |
| 3087 | |
| 3088 | err = socket_has_perm(current, sock, SOCKET__CONNECT); |
| 3089 | if (err) |
| 3090 | return err; |
| 3091 | |
| 3092 | /* |
| 3093 | * If a TCP socket, check name_connect permission for the port. |
| 3094 | */ |
| 3095 | isec = SOCK_INODE(sock)->i_security; |
| 3096 | if (isec->sclass == SECCLASS_TCP_SOCKET) { |
| 3097 | struct sock *sk = sock->sk; |
| 3098 | struct avc_audit_data ad; |
| 3099 | struct sockaddr_in *addr4 = NULL; |
| 3100 | struct sockaddr_in6 *addr6 = NULL; |
| 3101 | unsigned short snum; |
| 3102 | u32 sid; |
| 3103 | |
| 3104 | if (sk->sk_family == PF_INET) { |
| 3105 | addr4 = (struct sockaddr_in *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3106 | if (addrlen < sizeof(struct sockaddr_in)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3107 | return -EINVAL; |
| 3108 | snum = ntohs(addr4->sin_port); |
| 3109 | } else { |
| 3110 | addr6 = (struct sockaddr_in6 *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3111 | if (addrlen < SIN6_LEN_RFC2133) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3112 | return -EINVAL; |
| 3113 | snum = ntohs(addr6->sin6_port); |
| 3114 | } |
| 3115 | |
| 3116 | err = security_port_sid(sk->sk_family, sk->sk_type, |
| 3117 | sk->sk_protocol, snum, &sid); |
| 3118 | if (err) |
| 3119 | goto out; |
| 3120 | |
| 3121 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 3122 | ad.u.net.dport = htons(snum); |
| 3123 | ad.u.net.family = sk->sk_family; |
| 3124 | err = avc_has_perm(isec->sid, sid, isec->sclass, |
| 3125 | TCP_SOCKET__NAME_CONNECT, &ad); |
| 3126 | if (err) |
| 3127 | goto out; |
| 3128 | } |
| 3129 | |
| 3130 | out: |
| 3131 | return err; |
| 3132 | } |
| 3133 | |
| 3134 | static int selinux_socket_listen(struct socket *sock, int backlog) |
| 3135 | { |
| 3136 | return socket_has_perm(current, sock, SOCKET__LISTEN); |
| 3137 | } |
| 3138 | |
| 3139 | static int selinux_socket_accept(struct socket *sock, struct socket *newsock) |
| 3140 | { |
| 3141 | int err; |
| 3142 | struct inode_security_struct *isec; |
| 3143 | struct inode_security_struct *newisec; |
| 3144 | |
| 3145 | err = socket_has_perm(current, sock, SOCKET__ACCEPT); |
| 3146 | if (err) |
| 3147 | return err; |
| 3148 | |
| 3149 | newisec = SOCK_INODE(newsock)->i_security; |
| 3150 | |
| 3151 | isec = SOCK_INODE(sock)->i_security; |
| 3152 | newisec->sclass = isec->sclass; |
| 3153 | newisec->sid = isec->sid; |
| 3154 | newisec->initialized = 1; |
| 3155 | |
| 3156 | return 0; |
| 3157 | } |
| 3158 | |
| 3159 | static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg, |
| 3160 | int size) |
| 3161 | { |
| 3162 | return socket_has_perm(current, sock, SOCKET__WRITE); |
| 3163 | } |
| 3164 | |
| 3165 | static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg, |
| 3166 | int size, int flags) |
| 3167 | { |
| 3168 | return socket_has_perm(current, sock, SOCKET__READ); |
| 3169 | } |
| 3170 | |
| 3171 | static int selinux_socket_getsockname(struct socket *sock) |
| 3172 | { |
| 3173 | return socket_has_perm(current, sock, SOCKET__GETATTR); |
| 3174 | } |
| 3175 | |
| 3176 | static int selinux_socket_getpeername(struct socket *sock) |
| 3177 | { |
| 3178 | return socket_has_perm(current, sock, SOCKET__GETATTR); |
| 3179 | } |
| 3180 | |
| 3181 | static int selinux_socket_setsockopt(struct socket *sock,int level,int optname) |
| 3182 | { |
| 3183 | return socket_has_perm(current, sock, SOCKET__SETOPT); |
| 3184 | } |
| 3185 | |
| 3186 | static int selinux_socket_getsockopt(struct socket *sock, int level, |
| 3187 | int optname) |
| 3188 | { |
| 3189 | return socket_has_perm(current, sock, SOCKET__GETOPT); |
| 3190 | } |
| 3191 | |
| 3192 | static int selinux_socket_shutdown(struct socket *sock, int how) |
| 3193 | { |
| 3194 | return socket_has_perm(current, sock, SOCKET__SHUTDOWN); |
| 3195 | } |
| 3196 | |
| 3197 | static int selinux_socket_unix_stream_connect(struct socket *sock, |
| 3198 | struct socket *other, |
| 3199 | struct sock *newsk) |
| 3200 | { |
| 3201 | struct sk_security_struct *ssec; |
| 3202 | struct inode_security_struct *isec; |
| 3203 | struct inode_security_struct *other_isec; |
| 3204 | struct avc_audit_data ad; |
| 3205 | int err; |
| 3206 | |
| 3207 | err = secondary_ops->unix_stream_connect(sock, other, newsk); |
| 3208 | if (err) |
| 3209 | return err; |
| 3210 | |
| 3211 | isec = SOCK_INODE(sock)->i_security; |
| 3212 | other_isec = SOCK_INODE(other)->i_security; |
| 3213 | |
| 3214 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 3215 | ad.u.net.sk = other->sk; |
| 3216 | |
| 3217 | err = avc_has_perm(isec->sid, other_isec->sid, |
| 3218 | isec->sclass, |
| 3219 | UNIX_STREAM_SOCKET__CONNECTTO, &ad); |
| 3220 | if (err) |
| 3221 | return err; |
| 3222 | |
| 3223 | /* connecting socket */ |
| 3224 | ssec = sock->sk->sk_security; |
| 3225 | ssec->peer_sid = other_isec->sid; |
| 3226 | |
| 3227 | /* server child socket */ |
| 3228 | ssec = newsk->sk_security; |
| 3229 | ssec->peer_sid = isec->sid; |
| 3230 | |
| 3231 | return 0; |
| 3232 | } |
| 3233 | |
| 3234 | static int selinux_socket_unix_may_send(struct socket *sock, |
| 3235 | struct socket *other) |
| 3236 | { |
| 3237 | struct inode_security_struct *isec; |
| 3238 | struct inode_security_struct *other_isec; |
| 3239 | struct avc_audit_data ad; |
| 3240 | int err; |
| 3241 | |
| 3242 | isec = SOCK_INODE(sock)->i_security; |
| 3243 | other_isec = SOCK_INODE(other)->i_security; |
| 3244 | |
| 3245 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 3246 | ad.u.net.sk = other->sk; |
| 3247 | |
| 3248 | err = avc_has_perm(isec->sid, other_isec->sid, |
| 3249 | isec->sclass, SOCKET__SENDTO, &ad); |
| 3250 | if (err) |
| 3251 | return err; |
| 3252 | |
| 3253 | return 0; |
| 3254 | } |
| 3255 | |
| 3256 | static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 3257 | { |
| 3258 | u16 family; |
| 3259 | char *addrp; |
| 3260 | int len, err = 0; |
| 3261 | u32 netif_perm, node_perm, node_sid, if_sid, recv_perm = 0; |
| 3262 | u32 sock_sid = 0; |
| 3263 | u16 sock_class = 0; |
| 3264 | struct socket *sock; |
| 3265 | struct net_device *dev; |
| 3266 | struct avc_audit_data ad; |
| 3267 | |
| 3268 | family = sk->sk_family; |
| 3269 | if (family != PF_INET && family != PF_INET6) |
| 3270 | goto out; |
| 3271 | |
| 3272 | /* Handle mapped IPv4 packets arriving via IPv6 sockets */ |
| 3273 | if (family == PF_INET6 && skb->protocol == ntohs(ETH_P_IP)) |
| 3274 | family = PF_INET; |
| 3275 | |
| 3276 | read_lock_bh(&sk->sk_callback_lock); |
| 3277 | sock = sk->sk_socket; |
| 3278 | if (sock) { |
| 3279 | struct inode *inode; |
| 3280 | inode = SOCK_INODE(sock); |
| 3281 | if (inode) { |
| 3282 | struct inode_security_struct *isec; |
| 3283 | isec = inode->i_security; |
| 3284 | sock_sid = isec->sid; |
| 3285 | sock_class = isec->sclass; |
| 3286 | } |
| 3287 | } |
| 3288 | read_unlock_bh(&sk->sk_callback_lock); |
| 3289 | if (!sock_sid) |
| 3290 | goto out; |
| 3291 | |
| 3292 | dev = skb->dev; |
| 3293 | if (!dev) |
| 3294 | goto out; |
| 3295 | |
| 3296 | err = sel_netif_sids(dev, &if_sid, NULL); |
| 3297 | if (err) |
| 3298 | goto out; |
| 3299 | |
| 3300 | switch (sock_class) { |
| 3301 | case SECCLASS_UDP_SOCKET: |
| 3302 | netif_perm = NETIF__UDP_RECV; |
| 3303 | node_perm = NODE__UDP_RECV; |
| 3304 | recv_perm = UDP_SOCKET__RECV_MSG; |
| 3305 | break; |
| 3306 | |
| 3307 | case SECCLASS_TCP_SOCKET: |
| 3308 | netif_perm = NETIF__TCP_RECV; |
| 3309 | node_perm = NODE__TCP_RECV; |
| 3310 | recv_perm = TCP_SOCKET__RECV_MSG; |
| 3311 | break; |
| 3312 | |
| 3313 | default: |
| 3314 | netif_perm = NETIF__RAWIP_RECV; |
| 3315 | node_perm = NODE__RAWIP_RECV; |
| 3316 | break; |
| 3317 | } |
| 3318 | |
| 3319 | AVC_AUDIT_DATA_INIT(&ad, NET); |
| 3320 | ad.u.net.netif = dev->name; |
| 3321 | ad.u.net.family = family; |
| 3322 | |
| 3323 | err = selinux_parse_skb(skb, &ad, &addrp, &len, 1); |
| 3324 | if (err) |
| 3325 | goto out; |
| 3326 | |
| 3327 | err = avc_has_perm(sock_sid, if_sid, SECCLASS_NETIF, netif_perm, &ad); |
| 3328 | if (err) |
| 3329 | goto out; |
| 3330 | |
| 3331 | /* Fixme: this lookup is inefficient */ |
| 3332 | err = security_node_sid(family, addrp, len, &node_sid); |
| 3333 | if (err) |
| 3334 | goto out; |
| 3335 | |
| 3336 | err = avc_has_perm(sock_sid, node_sid, SECCLASS_NODE, node_perm, &ad); |
| 3337 | if (err) |
| 3338 | goto out; |
| 3339 | |
| 3340 | if (recv_perm) { |
| 3341 | u32 port_sid; |
| 3342 | |
| 3343 | /* Fixme: make this more efficient */ |
| 3344 | err = security_port_sid(sk->sk_family, sk->sk_type, |
| 3345 | sk->sk_protocol, ntohs(ad.u.net.sport), |
| 3346 | &port_sid); |
| 3347 | if (err) |
| 3348 | goto out; |
| 3349 | |
| 3350 | err = avc_has_perm(sock_sid, port_sid, |
| 3351 | sock_class, recv_perm, &ad); |
| 3352 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 3353 | |
| 3354 | if (!err) |
| 3355 | err = selinux_xfrm_sock_rcv_skb(sock_sid, skb); |
| 3356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3357 | out: |
| 3358 | return err; |
| 3359 | } |
| 3360 | |
| 3361 | static int selinux_socket_getpeersec(struct socket *sock, char __user *optval, |
| 3362 | int __user *optlen, unsigned len) |
| 3363 | { |
| 3364 | int err = 0; |
| 3365 | char *scontext; |
| 3366 | u32 scontext_len; |
| 3367 | struct sk_security_struct *ssec; |
| 3368 | struct inode_security_struct *isec; |
| 3369 | |
| 3370 | isec = SOCK_INODE(sock)->i_security; |
| 3371 | if (isec->sclass != SECCLASS_UNIX_STREAM_SOCKET) { |
| 3372 | err = -ENOPROTOOPT; |
| 3373 | goto out; |
| 3374 | } |
| 3375 | |
| 3376 | ssec = sock->sk->sk_security; |
| 3377 | |
| 3378 | err = security_sid_to_context(ssec->peer_sid, &scontext, &scontext_len); |
| 3379 | if (err) |
| 3380 | goto out; |
| 3381 | |
| 3382 | if (scontext_len > len) { |
| 3383 | err = -ERANGE; |
| 3384 | goto out_len; |
| 3385 | } |
| 3386 | |
| 3387 | if (copy_to_user(optval, scontext, scontext_len)) |
| 3388 | err = -EFAULT; |
| 3389 | |
| 3390 | out_len: |
| 3391 | if (put_user(scontext_len, optlen)) |
| 3392 | err = -EFAULT; |
| 3393 | |
| 3394 | kfree(scontext); |
| 3395 | out: |
| 3396 | return err; |
| 3397 | } |
| 3398 | |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 3399 | static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3400 | { |
| 3401 | return sk_alloc_security(sk, family, priority); |
| 3402 | } |
| 3403 | |
| 3404 | static void selinux_sk_free_security(struct sock *sk) |
| 3405 | { |
| 3406 | sk_free_security(sk); |
| 3407 | } |
| 3408 | |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 3409 | static unsigned int selinux_sk_getsid_security(struct sock *sk, struct flowi *fl, u8 dir) |
| 3410 | { |
| 3411 | struct inode_security_struct *isec; |
| 3412 | u32 sock_sid = SECINITSID_ANY_SOCKET; |
| 3413 | |
| 3414 | if (!sk) |
| 3415 | return selinux_no_sk_sid(fl); |
| 3416 | |
| 3417 | read_lock_bh(&sk->sk_callback_lock); |
| 3418 | isec = get_sock_isec(sk); |
| 3419 | |
| 3420 | if (isec) |
| 3421 | sock_sid = isec->sid; |
| 3422 | |
| 3423 | read_unlock_bh(&sk->sk_callback_lock); |
| 3424 | return sock_sid; |
| 3425 | } |
| 3426 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3427 | static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) |
| 3428 | { |
| 3429 | int err = 0; |
| 3430 | u32 perm; |
| 3431 | struct nlmsghdr *nlh; |
| 3432 | struct socket *sock = sk->sk_socket; |
| 3433 | struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; |
| 3434 | |
| 3435 | if (skb->len < NLMSG_SPACE(0)) { |
| 3436 | err = -EINVAL; |
| 3437 | goto out; |
| 3438 | } |
| 3439 | nlh = (struct nlmsghdr *)skb->data; |
| 3440 | |
| 3441 | err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm); |
| 3442 | if (err) { |
| 3443 | if (err == -EINVAL) { |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 3444 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3445 | "SELinux: unrecognized netlink message" |
| 3446 | " type=%hu for sclass=%hu\n", |
| 3447 | nlh->nlmsg_type, isec->sclass); |
| 3448 | if (!selinux_enforcing) |
| 3449 | err = 0; |
| 3450 | } |
| 3451 | |
| 3452 | /* Ignore */ |
| 3453 | if (err == -ENOENT) |
| 3454 | err = 0; |
| 3455 | goto out; |
| 3456 | } |
| 3457 | |
| 3458 | err = socket_has_perm(current, sock, perm); |
| 3459 | out: |
| 3460 | return err; |
| 3461 | } |
| 3462 | |
| 3463 | #ifdef CONFIG_NETFILTER |
| 3464 | |
| 3465 | static unsigned int selinux_ip_postroute_last(unsigned int hooknum, |
| 3466 | struct sk_buff **pskb, |
| 3467 | const struct net_device *in, |
| 3468 | const struct net_device *out, |
| 3469 | int (*okfn)(struct sk_buff *), |
| 3470 | u16 family) |
| 3471 | { |
| 3472 | char *addrp; |
| 3473 | int len, err = NF_ACCEPT; |
| 3474 | u32 netif_perm, node_perm, node_sid, if_sid, send_perm = 0; |
| 3475 | struct sock *sk; |
| 3476 | struct socket *sock; |
| 3477 | struct inode *inode; |
| 3478 | struct sk_buff *skb = *pskb; |
| 3479 | struct inode_security_struct *isec; |
| 3480 | struct avc_audit_data ad; |
| 3481 | struct net_device *dev = (struct net_device *)out; |
| 3482 | |
| 3483 | sk = skb->sk; |
| 3484 | if (!sk) |
| 3485 | goto out; |
| 3486 | |
| 3487 | sock = sk->sk_socket; |
| 3488 | if (!sock) |
| 3489 | goto out; |
| 3490 | |
| 3491 | inode = SOCK_INODE(sock); |
| 3492 | if (!inode) |
| 3493 | goto out; |
| 3494 | |
| 3495 | err = sel_netif_sids(dev, &if_sid, NULL); |
| 3496 | if (err) |
| 3497 | goto out; |
| 3498 | |
| 3499 | isec = inode->i_security; |
| 3500 | |
| 3501 | switch (isec->sclass) { |
| 3502 | case SECCLASS_UDP_SOCKET: |
| 3503 | netif_perm = NETIF__UDP_SEND; |
| 3504 | node_perm = NODE__UDP_SEND; |
| 3505 | send_perm = UDP_SOCKET__SEND_MSG; |
| 3506 | break; |
| 3507 | |
| 3508 | case SECCLASS_TCP_SOCKET: |
| 3509 | netif_perm = NETIF__TCP_SEND; |
| 3510 | node_perm = NODE__TCP_SEND; |
| 3511 | send_perm = TCP_SOCKET__SEND_MSG; |
| 3512 | break; |
| 3513 | |
| 3514 | default: |
| 3515 | netif_perm = NETIF__RAWIP_SEND; |
| 3516 | node_perm = NODE__RAWIP_SEND; |
| 3517 | break; |
| 3518 | } |
| 3519 | |
| 3520 | |
| 3521 | AVC_AUDIT_DATA_INIT(&ad, NET); |
| 3522 | ad.u.net.netif = dev->name; |
| 3523 | ad.u.net.family = family; |
| 3524 | |
| 3525 | err = selinux_parse_skb(skb, &ad, &addrp, |
| 3526 | &len, 0) ? NF_DROP : NF_ACCEPT; |
| 3527 | if (err != NF_ACCEPT) |
| 3528 | goto out; |
| 3529 | |
| 3530 | err = avc_has_perm(isec->sid, if_sid, SECCLASS_NETIF, |
| 3531 | netif_perm, &ad) ? NF_DROP : NF_ACCEPT; |
| 3532 | if (err != NF_ACCEPT) |
| 3533 | goto out; |
| 3534 | |
| 3535 | /* Fixme: this lookup is inefficient */ |
| 3536 | err = security_node_sid(family, addrp, len, |
| 3537 | &node_sid) ? NF_DROP : NF_ACCEPT; |
| 3538 | if (err != NF_ACCEPT) |
| 3539 | goto out; |
| 3540 | |
| 3541 | err = avc_has_perm(isec->sid, node_sid, SECCLASS_NODE, |
| 3542 | node_perm, &ad) ? NF_DROP : NF_ACCEPT; |
| 3543 | if (err != NF_ACCEPT) |
| 3544 | goto out; |
| 3545 | |
| 3546 | if (send_perm) { |
| 3547 | u32 port_sid; |
| 3548 | |
| 3549 | /* Fixme: make this more efficient */ |
| 3550 | err = security_port_sid(sk->sk_family, |
| 3551 | sk->sk_type, |
| 3552 | sk->sk_protocol, |
| 3553 | ntohs(ad.u.net.dport), |
| 3554 | &port_sid) ? NF_DROP : NF_ACCEPT; |
| 3555 | if (err != NF_ACCEPT) |
| 3556 | goto out; |
| 3557 | |
| 3558 | err = avc_has_perm(isec->sid, port_sid, isec->sclass, |
| 3559 | send_perm, &ad) ? NF_DROP : NF_ACCEPT; |
| 3560 | } |
| 3561 | |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 3562 | if (err != NF_ACCEPT) |
| 3563 | goto out; |
| 3564 | |
| 3565 | err = selinux_xfrm_postroute_last(isec->sid, skb); |
| 3566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3567 | out: |
| 3568 | return err; |
| 3569 | } |
| 3570 | |
| 3571 | static unsigned int selinux_ipv4_postroute_last(unsigned int hooknum, |
| 3572 | struct sk_buff **pskb, |
| 3573 | const struct net_device *in, |
| 3574 | const struct net_device *out, |
| 3575 | int (*okfn)(struct sk_buff *)) |
| 3576 | { |
| 3577 | return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET); |
| 3578 | } |
| 3579 | |
| 3580 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3581 | |
| 3582 | static unsigned int selinux_ipv6_postroute_last(unsigned int hooknum, |
| 3583 | struct sk_buff **pskb, |
| 3584 | const struct net_device *in, |
| 3585 | const struct net_device *out, |
| 3586 | int (*okfn)(struct sk_buff *)) |
| 3587 | { |
| 3588 | return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET6); |
| 3589 | } |
| 3590 | |
| 3591 | #endif /* IPV6 */ |
| 3592 | |
| 3593 | #endif /* CONFIG_NETFILTER */ |
| 3594 | |
| 3595 | #else |
| 3596 | |
| 3597 | static inline int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) |
| 3598 | { |
| 3599 | return 0; |
| 3600 | } |
| 3601 | |
| 3602 | #endif /* CONFIG_SECURITY_NETWORK */ |
| 3603 | |
| 3604 | static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb) |
| 3605 | { |
| 3606 | struct task_security_struct *tsec; |
| 3607 | struct av_decision avd; |
| 3608 | int err; |
| 3609 | |
| 3610 | err = secondary_ops->netlink_send(sk, skb); |
| 3611 | if (err) |
| 3612 | return err; |
| 3613 | |
| 3614 | tsec = current->security; |
| 3615 | |
| 3616 | avd.allowed = 0; |
| 3617 | avc_has_perm_noaudit(tsec->sid, tsec->sid, |
| 3618 | SECCLASS_CAPABILITY, ~0, &avd); |
| 3619 | cap_mask(NETLINK_CB(skb).eff_cap, avd.allowed); |
| 3620 | |
| 3621 | if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS) |
| 3622 | err = selinux_nlmsg_perm(sk, skb); |
| 3623 | |
| 3624 | return err; |
| 3625 | } |
| 3626 | |
| 3627 | static int selinux_netlink_recv(struct sk_buff *skb) |
| 3628 | { |
| 3629 | if (!cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN)) |
| 3630 | return -EPERM; |
| 3631 | return 0; |
| 3632 | } |
| 3633 | |
| 3634 | static int ipc_alloc_security(struct task_struct *task, |
| 3635 | struct kern_ipc_perm *perm, |
| 3636 | u16 sclass) |
| 3637 | { |
| 3638 | struct task_security_struct *tsec = task->security; |
| 3639 | struct ipc_security_struct *isec; |
| 3640 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 3641 | isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3642 | if (!isec) |
| 3643 | return -ENOMEM; |
| 3644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3645 | isec->magic = SELINUX_MAGIC; |
| 3646 | isec->sclass = sclass; |
| 3647 | isec->ipc_perm = perm; |
| 3648 | if (tsec) { |
| 3649 | isec->sid = tsec->sid; |
| 3650 | } else { |
| 3651 | isec->sid = SECINITSID_UNLABELED; |
| 3652 | } |
| 3653 | perm->security = isec; |
| 3654 | |
| 3655 | return 0; |
| 3656 | } |
| 3657 | |
| 3658 | static void ipc_free_security(struct kern_ipc_perm *perm) |
| 3659 | { |
| 3660 | struct ipc_security_struct *isec = perm->security; |
| 3661 | if (!isec || isec->magic != SELINUX_MAGIC) |
| 3662 | return; |
| 3663 | |
| 3664 | perm->security = NULL; |
| 3665 | kfree(isec); |
| 3666 | } |
| 3667 | |
| 3668 | static int msg_msg_alloc_security(struct msg_msg *msg) |
| 3669 | { |
| 3670 | struct msg_security_struct *msec; |
| 3671 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 3672 | msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3673 | if (!msec) |
| 3674 | return -ENOMEM; |
| 3675 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3676 | msec->magic = SELINUX_MAGIC; |
| 3677 | msec->msg = msg; |
| 3678 | msec->sid = SECINITSID_UNLABELED; |
| 3679 | msg->security = msec; |
| 3680 | |
| 3681 | return 0; |
| 3682 | } |
| 3683 | |
| 3684 | static void msg_msg_free_security(struct msg_msg *msg) |
| 3685 | { |
| 3686 | struct msg_security_struct *msec = msg->security; |
| 3687 | if (!msec || msec->magic != SELINUX_MAGIC) |
| 3688 | return; |
| 3689 | |
| 3690 | msg->security = NULL; |
| 3691 | kfree(msec); |
| 3692 | } |
| 3693 | |
| 3694 | static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 3695 | u32 perms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3696 | { |
| 3697 | struct task_security_struct *tsec; |
| 3698 | struct ipc_security_struct *isec; |
| 3699 | struct avc_audit_data ad; |
| 3700 | |
| 3701 | tsec = current->security; |
| 3702 | isec = ipc_perms->security; |
| 3703 | |
| 3704 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 3705 | ad.u.ipc_id = ipc_perms->key; |
| 3706 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 3707 | return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3708 | } |
| 3709 | |
| 3710 | static int selinux_msg_msg_alloc_security(struct msg_msg *msg) |
| 3711 | { |
| 3712 | return msg_msg_alloc_security(msg); |
| 3713 | } |
| 3714 | |
| 3715 | static void selinux_msg_msg_free_security(struct msg_msg *msg) |
| 3716 | { |
| 3717 | msg_msg_free_security(msg); |
| 3718 | } |
| 3719 | |
| 3720 | /* message queue security operations */ |
| 3721 | static int selinux_msg_queue_alloc_security(struct msg_queue *msq) |
| 3722 | { |
| 3723 | struct task_security_struct *tsec; |
| 3724 | struct ipc_security_struct *isec; |
| 3725 | struct avc_audit_data ad; |
| 3726 | int rc; |
| 3727 | |
| 3728 | rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ); |
| 3729 | if (rc) |
| 3730 | return rc; |
| 3731 | |
| 3732 | tsec = current->security; |
| 3733 | isec = msq->q_perm.security; |
| 3734 | |
| 3735 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 3736 | ad.u.ipc_id = msq->q_perm.key; |
| 3737 | |
| 3738 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, |
| 3739 | MSGQ__CREATE, &ad); |
| 3740 | if (rc) { |
| 3741 | ipc_free_security(&msq->q_perm); |
| 3742 | return rc; |
| 3743 | } |
| 3744 | return 0; |
| 3745 | } |
| 3746 | |
| 3747 | static void selinux_msg_queue_free_security(struct msg_queue *msq) |
| 3748 | { |
| 3749 | ipc_free_security(&msq->q_perm); |
| 3750 | } |
| 3751 | |
| 3752 | static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg) |
| 3753 | { |
| 3754 | struct task_security_struct *tsec; |
| 3755 | struct ipc_security_struct *isec; |
| 3756 | struct avc_audit_data ad; |
| 3757 | |
| 3758 | tsec = current->security; |
| 3759 | isec = msq->q_perm.security; |
| 3760 | |
| 3761 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 3762 | ad.u.ipc_id = msq->q_perm.key; |
| 3763 | |
| 3764 | return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, |
| 3765 | MSGQ__ASSOCIATE, &ad); |
| 3766 | } |
| 3767 | |
| 3768 | static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) |
| 3769 | { |
| 3770 | int err; |
| 3771 | int perms; |
| 3772 | |
| 3773 | switch(cmd) { |
| 3774 | case IPC_INFO: |
| 3775 | case MSG_INFO: |
| 3776 | /* No specific object, just general system-wide information. */ |
| 3777 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 3778 | case IPC_STAT: |
| 3779 | case MSG_STAT: |
| 3780 | perms = MSGQ__GETATTR | MSGQ__ASSOCIATE; |
| 3781 | break; |
| 3782 | case IPC_SET: |
| 3783 | perms = MSGQ__SETATTR; |
| 3784 | break; |
| 3785 | case IPC_RMID: |
| 3786 | perms = MSGQ__DESTROY; |
| 3787 | break; |
| 3788 | default: |
| 3789 | return 0; |
| 3790 | } |
| 3791 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 3792 | err = ipc_has_perm(&msq->q_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3793 | return err; |
| 3794 | } |
| 3795 | |
| 3796 | static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg) |
| 3797 | { |
| 3798 | struct task_security_struct *tsec; |
| 3799 | struct ipc_security_struct *isec; |
| 3800 | struct msg_security_struct *msec; |
| 3801 | struct avc_audit_data ad; |
| 3802 | int rc; |
| 3803 | |
| 3804 | tsec = current->security; |
| 3805 | isec = msq->q_perm.security; |
| 3806 | msec = msg->security; |
| 3807 | |
| 3808 | /* |
| 3809 | * First time through, need to assign label to the message |
| 3810 | */ |
| 3811 | if (msec->sid == SECINITSID_UNLABELED) { |
| 3812 | /* |
| 3813 | * Compute new sid based on current process and |
| 3814 | * message queue this message will be stored in |
| 3815 | */ |
| 3816 | rc = security_transition_sid(tsec->sid, |
| 3817 | isec->sid, |
| 3818 | SECCLASS_MSG, |
| 3819 | &msec->sid); |
| 3820 | if (rc) |
| 3821 | return rc; |
| 3822 | } |
| 3823 | |
| 3824 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 3825 | ad.u.ipc_id = msq->q_perm.key; |
| 3826 | |
| 3827 | /* Can this process write to the queue? */ |
| 3828 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, |
| 3829 | MSGQ__WRITE, &ad); |
| 3830 | if (!rc) |
| 3831 | /* Can this process send the message */ |
| 3832 | rc = avc_has_perm(tsec->sid, msec->sid, |
| 3833 | SECCLASS_MSG, MSG__SEND, &ad); |
| 3834 | if (!rc) |
| 3835 | /* Can the message be put in the queue? */ |
| 3836 | rc = avc_has_perm(msec->sid, isec->sid, |
| 3837 | SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad); |
| 3838 | |
| 3839 | return rc; |
| 3840 | } |
| 3841 | |
| 3842 | static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, |
| 3843 | struct task_struct *target, |
| 3844 | long type, int mode) |
| 3845 | { |
| 3846 | struct task_security_struct *tsec; |
| 3847 | struct ipc_security_struct *isec; |
| 3848 | struct msg_security_struct *msec; |
| 3849 | struct avc_audit_data ad; |
| 3850 | int rc; |
| 3851 | |
| 3852 | tsec = target->security; |
| 3853 | isec = msq->q_perm.security; |
| 3854 | msec = msg->security; |
| 3855 | |
| 3856 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 3857 | ad.u.ipc_id = msq->q_perm.key; |
| 3858 | |
| 3859 | rc = avc_has_perm(tsec->sid, isec->sid, |
| 3860 | SECCLASS_MSGQ, MSGQ__READ, &ad); |
| 3861 | if (!rc) |
| 3862 | rc = avc_has_perm(tsec->sid, msec->sid, |
| 3863 | SECCLASS_MSG, MSG__RECEIVE, &ad); |
| 3864 | return rc; |
| 3865 | } |
| 3866 | |
| 3867 | /* Shared Memory security operations */ |
| 3868 | static int selinux_shm_alloc_security(struct shmid_kernel *shp) |
| 3869 | { |
| 3870 | struct task_security_struct *tsec; |
| 3871 | struct ipc_security_struct *isec; |
| 3872 | struct avc_audit_data ad; |
| 3873 | int rc; |
| 3874 | |
| 3875 | rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM); |
| 3876 | if (rc) |
| 3877 | return rc; |
| 3878 | |
| 3879 | tsec = current->security; |
| 3880 | isec = shp->shm_perm.security; |
| 3881 | |
| 3882 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 3883 | ad.u.ipc_id = shp->shm_perm.key; |
| 3884 | |
| 3885 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM, |
| 3886 | SHM__CREATE, &ad); |
| 3887 | if (rc) { |
| 3888 | ipc_free_security(&shp->shm_perm); |
| 3889 | return rc; |
| 3890 | } |
| 3891 | return 0; |
| 3892 | } |
| 3893 | |
| 3894 | static void selinux_shm_free_security(struct shmid_kernel *shp) |
| 3895 | { |
| 3896 | ipc_free_security(&shp->shm_perm); |
| 3897 | } |
| 3898 | |
| 3899 | static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg) |
| 3900 | { |
| 3901 | struct task_security_struct *tsec; |
| 3902 | struct ipc_security_struct *isec; |
| 3903 | struct avc_audit_data ad; |
| 3904 | |
| 3905 | tsec = current->security; |
| 3906 | isec = shp->shm_perm.security; |
| 3907 | |
| 3908 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 3909 | ad.u.ipc_id = shp->shm_perm.key; |
| 3910 | |
| 3911 | return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM, |
| 3912 | SHM__ASSOCIATE, &ad); |
| 3913 | } |
| 3914 | |
| 3915 | /* Note, at this point, shp is locked down */ |
| 3916 | static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd) |
| 3917 | { |
| 3918 | int perms; |
| 3919 | int err; |
| 3920 | |
| 3921 | switch(cmd) { |
| 3922 | case IPC_INFO: |
| 3923 | case SHM_INFO: |
| 3924 | /* No specific object, just general system-wide information. */ |
| 3925 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 3926 | case IPC_STAT: |
| 3927 | case SHM_STAT: |
| 3928 | perms = SHM__GETATTR | SHM__ASSOCIATE; |
| 3929 | break; |
| 3930 | case IPC_SET: |
| 3931 | perms = SHM__SETATTR; |
| 3932 | break; |
| 3933 | case SHM_LOCK: |
| 3934 | case SHM_UNLOCK: |
| 3935 | perms = SHM__LOCK; |
| 3936 | break; |
| 3937 | case IPC_RMID: |
| 3938 | perms = SHM__DESTROY; |
| 3939 | break; |
| 3940 | default: |
| 3941 | return 0; |
| 3942 | } |
| 3943 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 3944 | err = ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3945 | return err; |
| 3946 | } |
| 3947 | |
| 3948 | static int selinux_shm_shmat(struct shmid_kernel *shp, |
| 3949 | char __user *shmaddr, int shmflg) |
| 3950 | { |
| 3951 | u32 perms; |
| 3952 | int rc; |
| 3953 | |
| 3954 | rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg); |
| 3955 | if (rc) |
| 3956 | return rc; |
| 3957 | |
| 3958 | if (shmflg & SHM_RDONLY) |
| 3959 | perms = SHM__READ; |
| 3960 | else |
| 3961 | perms = SHM__READ | SHM__WRITE; |
| 3962 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 3963 | return ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3964 | } |
| 3965 | |
| 3966 | /* Semaphore security operations */ |
| 3967 | static int selinux_sem_alloc_security(struct sem_array *sma) |
| 3968 | { |
| 3969 | struct task_security_struct *tsec; |
| 3970 | struct ipc_security_struct *isec; |
| 3971 | struct avc_audit_data ad; |
| 3972 | int rc; |
| 3973 | |
| 3974 | rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM); |
| 3975 | if (rc) |
| 3976 | return rc; |
| 3977 | |
| 3978 | tsec = current->security; |
| 3979 | isec = sma->sem_perm.security; |
| 3980 | |
| 3981 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 3982 | ad.u.ipc_id = sma->sem_perm.key; |
| 3983 | |
| 3984 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM, |
| 3985 | SEM__CREATE, &ad); |
| 3986 | if (rc) { |
| 3987 | ipc_free_security(&sma->sem_perm); |
| 3988 | return rc; |
| 3989 | } |
| 3990 | return 0; |
| 3991 | } |
| 3992 | |
| 3993 | static void selinux_sem_free_security(struct sem_array *sma) |
| 3994 | { |
| 3995 | ipc_free_security(&sma->sem_perm); |
| 3996 | } |
| 3997 | |
| 3998 | static int selinux_sem_associate(struct sem_array *sma, int semflg) |
| 3999 | { |
| 4000 | struct task_security_struct *tsec; |
| 4001 | struct ipc_security_struct *isec; |
| 4002 | struct avc_audit_data ad; |
| 4003 | |
| 4004 | tsec = current->security; |
| 4005 | isec = sma->sem_perm.security; |
| 4006 | |
| 4007 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4008 | ad.u.ipc_id = sma->sem_perm.key; |
| 4009 | |
| 4010 | return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM, |
| 4011 | SEM__ASSOCIATE, &ad); |
| 4012 | } |
| 4013 | |
| 4014 | /* Note, at this point, sma is locked down */ |
| 4015 | static int selinux_sem_semctl(struct sem_array *sma, int cmd) |
| 4016 | { |
| 4017 | int err; |
| 4018 | u32 perms; |
| 4019 | |
| 4020 | switch(cmd) { |
| 4021 | case IPC_INFO: |
| 4022 | case SEM_INFO: |
| 4023 | /* No specific object, just general system-wide information. */ |
| 4024 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 4025 | case GETPID: |
| 4026 | case GETNCNT: |
| 4027 | case GETZCNT: |
| 4028 | perms = SEM__GETATTR; |
| 4029 | break; |
| 4030 | case GETVAL: |
| 4031 | case GETALL: |
| 4032 | perms = SEM__READ; |
| 4033 | break; |
| 4034 | case SETVAL: |
| 4035 | case SETALL: |
| 4036 | perms = SEM__WRITE; |
| 4037 | break; |
| 4038 | case IPC_RMID: |
| 4039 | perms = SEM__DESTROY; |
| 4040 | break; |
| 4041 | case IPC_SET: |
| 4042 | perms = SEM__SETATTR; |
| 4043 | break; |
| 4044 | case IPC_STAT: |
| 4045 | case SEM_STAT: |
| 4046 | perms = SEM__GETATTR | SEM__ASSOCIATE; |
| 4047 | break; |
| 4048 | default: |
| 4049 | return 0; |
| 4050 | } |
| 4051 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4052 | err = ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4053 | return err; |
| 4054 | } |
| 4055 | |
| 4056 | static int selinux_sem_semop(struct sem_array *sma, |
| 4057 | struct sembuf *sops, unsigned nsops, int alter) |
| 4058 | { |
| 4059 | u32 perms; |
| 4060 | |
| 4061 | if (alter) |
| 4062 | perms = SEM__READ | SEM__WRITE; |
| 4063 | else |
| 4064 | perms = SEM__READ; |
| 4065 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4066 | return ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4067 | } |
| 4068 | |
| 4069 | static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag) |
| 4070 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4071 | u32 av = 0; |
| 4072 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4073 | av = 0; |
| 4074 | if (flag & S_IRUGO) |
| 4075 | av |= IPC__UNIX_READ; |
| 4076 | if (flag & S_IWUGO) |
| 4077 | av |= IPC__UNIX_WRITE; |
| 4078 | |
| 4079 | if (av == 0) |
| 4080 | return 0; |
| 4081 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4082 | return ipc_has_perm(ipcp, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4083 | } |
| 4084 | |
| 4085 | /* module stacking operations */ |
| 4086 | static int selinux_register_security (const char *name, struct security_operations *ops) |
| 4087 | { |
| 4088 | if (secondary_ops != original_ops) { |
| 4089 | printk(KERN_INFO "%s: There is already a secondary security " |
| 4090 | "module registered.\n", __FUNCTION__); |
| 4091 | return -EINVAL; |
| 4092 | } |
| 4093 | |
| 4094 | secondary_ops = ops; |
| 4095 | |
| 4096 | printk(KERN_INFO "%s: Registering secondary module %s\n", |
| 4097 | __FUNCTION__, |
| 4098 | name); |
| 4099 | |
| 4100 | return 0; |
| 4101 | } |
| 4102 | |
| 4103 | static int selinux_unregister_security (const char *name, struct security_operations *ops) |
| 4104 | { |
| 4105 | if (ops != secondary_ops) { |
| 4106 | printk (KERN_INFO "%s: trying to unregister a security module " |
| 4107 | "that is not registered.\n", __FUNCTION__); |
| 4108 | return -EINVAL; |
| 4109 | } |
| 4110 | |
| 4111 | secondary_ops = original_ops; |
| 4112 | |
| 4113 | return 0; |
| 4114 | } |
| 4115 | |
| 4116 | static void selinux_d_instantiate (struct dentry *dentry, struct inode *inode) |
| 4117 | { |
| 4118 | if (inode) |
| 4119 | inode_doinit_with_dentry(inode, dentry); |
| 4120 | } |
| 4121 | |
| 4122 | static int selinux_getprocattr(struct task_struct *p, |
| 4123 | char *name, void *value, size_t size) |
| 4124 | { |
| 4125 | struct task_security_struct *tsec; |
| 4126 | u32 sid, len; |
| 4127 | char *context; |
| 4128 | int error; |
| 4129 | |
| 4130 | if (current != p) { |
| 4131 | error = task_has_perm(current, p, PROCESS__GETATTR); |
| 4132 | if (error) |
| 4133 | return error; |
| 4134 | } |
| 4135 | |
| 4136 | if (!size) |
| 4137 | return -ERANGE; |
| 4138 | |
| 4139 | tsec = p->security; |
| 4140 | |
| 4141 | if (!strcmp(name, "current")) |
| 4142 | sid = tsec->sid; |
| 4143 | else if (!strcmp(name, "prev")) |
| 4144 | sid = tsec->osid; |
| 4145 | else if (!strcmp(name, "exec")) |
| 4146 | sid = tsec->exec_sid; |
| 4147 | else if (!strcmp(name, "fscreate")) |
| 4148 | sid = tsec->create_sid; |
| 4149 | else |
| 4150 | return -EINVAL; |
| 4151 | |
| 4152 | if (!sid) |
| 4153 | return 0; |
| 4154 | |
| 4155 | error = security_sid_to_context(sid, &context, &len); |
| 4156 | if (error) |
| 4157 | return error; |
| 4158 | if (len > size) { |
| 4159 | kfree(context); |
| 4160 | return -ERANGE; |
| 4161 | } |
| 4162 | memcpy(value, context, len); |
| 4163 | kfree(context); |
| 4164 | return len; |
| 4165 | } |
| 4166 | |
| 4167 | static int selinux_setprocattr(struct task_struct *p, |
| 4168 | char *name, void *value, size_t size) |
| 4169 | { |
| 4170 | struct task_security_struct *tsec; |
| 4171 | u32 sid = 0; |
| 4172 | int error; |
| 4173 | char *str = value; |
| 4174 | |
| 4175 | if (current != p) { |
| 4176 | /* SELinux only allows a process to change its own |
| 4177 | security attributes. */ |
| 4178 | return -EACCES; |
| 4179 | } |
| 4180 | |
| 4181 | /* |
| 4182 | * Basic control over ability to set these attributes at all. |
| 4183 | * current == p, but we'll pass them separately in case the |
| 4184 | * above restriction is ever removed. |
| 4185 | */ |
| 4186 | if (!strcmp(name, "exec")) |
| 4187 | error = task_has_perm(current, p, PROCESS__SETEXEC); |
| 4188 | else if (!strcmp(name, "fscreate")) |
| 4189 | error = task_has_perm(current, p, PROCESS__SETFSCREATE); |
| 4190 | else if (!strcmp(name, "current")) |
| 4191 | error = task_has_perm(current, p, PROCESS__SETCURRENT); |
| 4192 | else |
| 4193 | error = -EINVAL; |
| 4194 | if (error) |
| 4195 | return error; |
| 4196 | |
| 4197 | /* Obtain a SID for the context, if one was specified. */ |
| 4198 | if (size && str[1] && str[1] != '\n') { |
| 4199 | if (str[size-1] == '\n') { |
| 4200 | str[size-1] = 0; |
| 4201 | size--; |
| 4202 | } |
| 4203 | error = security_context_to_sid(value, size, &sid); |
| 4204 | if (error) |
| 4205 | return error; |
| 4206 | } |
| 4207 | |
| 4208 | /* Permission checking based on the specified context is |
| 4209 | performed during the actual operation (execve, |
| 4210 | open/mkdir/...), when we know the full context of the |
| 4211 | operation. See selinux_bprm_set_security for the execve |
| 4212 | checks and may_create for the file creation checks. The |
| 4213 | operation will then fail if the context is not permitted. */ |
| 4214 | tsec = p->security; |
| 4215 | if (!strcmp(name, "exec")) |
| 4216 | tsec->exec_sid = sid; |
| 4217 | else if (!strcmp(name, "fscreate")) |
| 4218 | tsec->create_sid = sid; |
| 4219 | else if (!strcmp(name, "current")) { |
| 4220 | struct av_decision avd; |
| 4221 | |
| 4222 | if (sid == 0) |
| 4223 | return -EINVAL; |
| 4224 | |
| 4225 | /* Only allow single threaded processes to change context */ |
| 4226 | if (atomic_read(&p->mm->mm_users) != 1) { |
| 4227 | struct task_struct *g, *t; |
| 4228 | struct mm_struct *mm = p->mm; |
| 4229 | read_lock(&tasklist_lock); |
| 4230 | do_each_thread(g, t) |
| 4231 | if (t->mm == mm && t != p) { |
| 4232 | read_unlock(&tasklist_lock); |
| 4233 | return -EPERM; |
| 4234 | } |
| 4235 | while_each_thread(g, t); |
| 4236 | read_unlock(&tasklist_lock); |
| 4237 | } |
| 4238 | |
| 4239 | /* Check permissions for the transition. */ |
| 4240 | error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |
| 4241 | PROCESS__DYNTRANSITION, NULL); |
| 4242 | if (error) |
| 4243 | return error; |
| 4244 | |
| 4245 | /* Check for ptracing, and update the task SID if ok. |
| 4246 | Otherwise, leave SID unchanged and fail. */ |
| 4247 | task_lock(p); |
| 4248 | if (p->ptrace & PT_PTRACED) { |
| 4249 | error = avc_has_perm_noaudit(tsec->ptrace_sid, sid, |
| 4250 | SECCLASS_PROCESS, |
| 4251 | PROCESS__PTRACE, &avd); |
| 4252 | if (!error) |
| 4253 | tsec->sid = sid; |
| 4254 | task_unlock(p); |
| 4255 | avc_audit(tsec->ptrace_sid, sid, SECCLASS_PROCESS, |
| 4256 | PROCESS__PTRACE, &avd, error, NULL); |
| 4257 | if (error) |
| 4258 | return error; |
| 4259 | } else { |
| 4260 | tsec->sid = sid; |
| 4261 | task_unlock(p); |
| 4262 | } |
| 4263 | } |
| 4264 | else |
| 4265 | return -EINVAL; |
| 4266 | |
| 4267 | return size; |
| 4268 | } |
| 4269 | |
| 4270 | static struct security_operations selinux_ops = { |
| 4271 | .ptrace = selinux_ptrace, |
| 4272 | .capget = selinux_capget, |
| 4273 | .capset_check = selinux_capset_check, |
| 4274 | .capset_set = selinux_capset_set, |
| 4275 | .sysctl = selinux_sysctl, |
| 4276 | .capable = selinux_capable, |
| 4277 | .quotactl = selinux_quotactl, |
| 4278 | .quota_on = selinux_quota_on, |
| 4279 | .syslog = selinux_syslog, |
| 4280 | .vm_enough_memory = selinux_vm_enough_memory, |
| 4281 | |
| 4282 | .netlink_send = selinux_netlink_send, |
| 4283 | .netlink_recv = selinux_netlink_recv, |
| 4284 | |
| 4285 | .bprm_alloc_security = selinux_bprm_alloc_security, |
| 4286 | .bprm_free_security = selinux_bprm_free_security, |
| 4287 | .bprm_apply_creds = selinux_bprm_apply_creds, |
| 4288 | .bprm_post_apply_creds = selinux_bprm_post_apply_creds, |
| 4289 | .bprm_set_security = selinux_bprm_set_security, |
| 4290 | .bprm_check_security = selinux_bprm_check_security, |
| 4291 | .bprm_secureexec = selinux_bprm_secureexec, |
| 4292 | |
| 4293 | .sb_alloc_security = selinux_sb_alloc_security, |
| 4294 | .sb_free_security = selinux_sb_free_security, |
| 4295 | .sb_copy_data = selinux_sb_copy_data, |
| 4296 | .sb_kern_mount = selinux_sb_kern_mount, |
| 4297 | .sb_statfs = selinux_sb_statfs, |
| 4298 | .sb_mount = selinux_mount, |
| 4299 | .sb_umount = selinux_umount, |
| 4300 | |
| 4301 | .inode_alloc_security = selinux_inode_alloc_security, |
| 4302 | .inode_free_security = selinux_inode_free_security, |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 4303 | .inode_init_security = selinux_inode_init_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4304 | .inode_create = selinux_inode_create, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4305 | .inode_link = selinux_inode_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4306 | .inode_unlink = selinux_inode_unlink, |
| 4307 | .inode_symlink = selinux_inode_symlink, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4308 | .inode_mkdir = selinux_inode_mkdir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4309 | .inode_rmdir = selinux_inode_rmdir, |
| 4310 | .inode_mknod = selinux_inode_mknod, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4311 | .inode_rename = selinux_inode_rename, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4312 | .inode_readlink = selinux_inode_readlink, |
| 4313 | .inode_follow_link = selinux_inode_follow_link, |
| 4314 | .inode_permission = selinux_inode_permission, |
| 4315 | .inode_setattr = selinux_inode_setattr, |
| 4316 | .inode_getattr = selinux_inode_getattr, |
| 4317 | .inode_setxattr = selinux_inode_setxattr, |
| 4318 | .inode_post_setxattr = selinux_inode_post_setxattr, |
| 4319 | .inode_getxattr = selinux_inode_getxattr, |
| 4320 | .inode_listxattr = selinux_inode_listxattr, |
| 4321 | .inode_removexattr = selinux_inode_removexattr, |
| 4322 | .inode_getsecurity = selinux_inode_getsecurity, |
| 4323 | .inode_setsecurity = selinux_inode_setsecurity, |
| 4324 | .inode_listsecurity = selinux_inode_listsecurity, |
| 4325 | |
| 4326 | .file_permission = selinux_file_permission, |
| 4327 | .file_alloc_security = selinux_file_alloc_security, |
| 4328 | .file_free_security = selinux_file_free_security, |
| 4329 | .file_ioctl = selinux_file_ioctl, |
| 4330 | .file_mmap = selinux_file_mmap, |
| 4331 | .file_mprotect = selinux_file_mprotect, |
| 4332 | .file_lock = selinux_file_lock, |
| 4333 | .file_fcntl = selinux_file_fcntl, |
| 4334 | .file_set_fowner = selinux_file_set_fowner, |
| 4335 | .file_send_sigiotask = selinux_file_send_sigiotask, |
| 4336 | .file_receive = selinux_file_receive, |
| 4337 | |
| 4338 | .task_create = selinux_task_create, |
| 4339 | .task_alloc_security = selinux_task_alloc_security, |
| 4340 | .task_free_security = selinux_task_free_security, |
| 4341 | .task_setuid = selinux_task_setuid, |
| 4342 | .task_post_setuid = selinux_task_post_setuid, |
| 4343 | .task_setgid = selinux_task_setgid, |
| 4344 | .task_setpgid = selinux_task_setpgid, |
| 4345 | .task_getpgid = selinux_task_getpgid, |
| 4346 | .task_getsid = selinux_task_getsid, |
| 4347 | .task_setgroups = selinux_task_setgroups, |
| 4348 | .task_setnice = selinux_task_setnice, |
| 4349 | .task_setrlimit = selinux_task_setrlimit, |
| 4350 | .task_setscheduler = selinux_task_setscheduler, |
| 4351 | .task_getscheduler = selinux_task_getscheduler, |
| 4352 | .task_kill = selinux_task_kill, |
| 4353 | .task_wait = selinux_task_wait, |
| 4354 | .task_prctl = selinux_task_prctl, |
| 4355 | .task_reparent_to_init = selinux_task_reparent_to_init, |
| 4356 | .task_to_inode = selinux_task_to_inode, |
| 4357 | |
| 4358 | .ipc_permission = selinux_ipc_permission, |
| 4359 | |
| 4360 | .msg_msg_alloc_security = selinux_msg_msg_alloc_security, |
| 4361 | .msg_msg_free_security = selinux_msg_msg_free_security, |
| 4362 | |
| 4363 | .msg_queue_alloc_security = selinux_msg_queue_alloc_security, |
| 4364 | .msg_queue_free_security = selinux_msg_queue_free_security, |
| 4365 | .msg_queue_associate = selinux_msg_queue_associate, |
| 4366 | .msg_queue_msgctl = selinux_msg_queue_msgctl, |
| 4367 | .msg_queue_msgsnd = selinux_msg_queue_msgsnd, |
| 4368 | .msg_queue_msgrcv = selinux_msg_queue_msgrcv, |
| 4369 | |
| 4370 | .shm_alloc_security = selinux_shm_alloc_security, |
| 4371 | .shm_free_security = selinux_shm_free_security, |
| 4372 | .shm_associate = selinux_shm_associate, |
| 4373 | .shm_shmctl = selinux_shm_shmctl, |
| 4374 | .shm_shmat = selinux_shm_shmat, |
| 4375 | |
| 4376 | .sem_alloc_security = selinux_sem_alloc_security, |
| 4377 | .sem_free_security = selinux_sem_free_security, |
| 4378 | .sem_associate = selinux_sem_associate, |
| 4379 | .sem_semctl = selinux_sem_semctl, |
| 4380 | .sem_semop = selinux_sem_semop, |
| 4381 | |
| 4382 | .register_security = selinux_register_security, |
| 4383 | .unregister_security = selinux_unregister_security, |
| 4384 | |
| 4385 | .d_instantiate = selinux_d_instantiate, |
| 4386 | |
| 4387 | .getprocattr = selinux_getprocattr, |
| 4388 | .setprocattr = selinux_setprocattr, |
| 4389 | |
| 4390 | #ifdef CONFIG_SECURITY_NETWORK |
| 4391 | .unix_stream_connect = selinux_socket_unix_stream_connect, |
| 4392 | .unix_may_send = selinux_socket_unix_may_send, |
| 4393 | |
| 4394 | .socket_create = selinux_socket_create, |
| 4395 | .socket_post_create = selinux_socket_post_create, |
| 4396 | .socket_bind = selinux_socket_bind, |
| 4397 | .socket_connect = selinux_socket_connect, |
| 4398 | .socket_listen = selinux_socket_listen, |
| 4399 | .socket_accept = selinux_socket_accept, |
| 4400 | .socket_sendmsg = selinux_socket_sendmsg, |
| 4401 | .socket_recvmsg = selinux_socket_recvmsg, |
| 4402 | .socket_getsockname = selinux_socket_getsockname, |
| 4403 | .socket_getpeername = selinux_socket_getpeername, |
| 4404 | .socket_getsockopt = selinux_socket_getsockopt, |
| 4405 | .socket_setsockopt = selinux_socket_setsockopt, |
| 4406 | .socket_shutdown = selinux_socket_shutdown, |
| 4407 | .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb, |
| 4408 | .socket_getpeersec = selinux_socket_getpeersec, |
| 4409 | .sk_alloc_security = selinux_sk_alloc_security, |
| 4410 | .sk_free_security = selinux_sk_free_security, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4411 | .sk_getsid = selinux_sk_getsid_security, |
| 4412 | #endif |
| 4413 | |
| 4414 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
| 4415 | .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc, |
| 4416 | .xfrm_policy_clone_security = selinux_xfrm_policy_clone, |
| 4417 | .xfrm_policy_free_security = selinux_xfrm_policy_free, |
| 4418 | .xfrm_state_alloc_security = selinux_xfrm_state_alloc, |
| 4419 | .xfrm_state_free_security = selinux_xfrm_state_free, |
| 4420 | .xfrm_policy_lookup = selinux_xfrm_policy_lookup, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4421 | #endif |
| 4422 | }; |
| 4423 | |
| 4424 | static __init int selinux_init(void) |
| 4425 | { |
| 4426 | struct task_security_struct *tsec; |
| 4427 | |
| 4428 | if (!selinux_enabled) { |
| 4429 | printk(KERN_INFO "SELinux: Disabled at boot.\n"); |
| 4430 | return 0; |
| 4431 | } |
| 4432 | |
| 4433 | printk(KERN_INFO "SELinux: Initializing.\n"); |
| 4434 | |
| 4435 | /* Set the security state for the initial task. */ |
| 4436 | if (task_alloc_security(current)) |
| 4437 | panic("SELinux: Failed to initialize initial task.\n"); |
| 4438 | tsec = current->security; |
| 4439 | tsec->osid = tsec->sid = SECINITSID_KERNEL; |
| 4440 | |
| 4441 | avc_init(); |
| 4442 | |
| 4443 | original_ops = secondary_ops = security_ops; |
| 4444 | if (!secondary_ops) |
| 4445 | panic ("SELinux: No initial security operations\n"); |
| 4446 | if (register_security (&selinux_ops)) |
| 4447 | panic("SELinux: Unable to register with kernel.\n"); |
| 4448 | |
| 4449 | if (selinux_enforcing) { |
| 4450 | printk(KERN_INFO "SELinux: Starting in enforcing mode\n"); |
| 4451 | } else { |
| 4452 | printk(KERN_INFO "SELinux: Starting in permissive mode\n"); |
| 4453 | } |
| 4454 | return 0; |
| 4455 | } |
| 4456 | |
| 4457 | void selinux_complete_init(void) |
| 4458 | { |
| 4459 | printk(KERN_INFO "SELinux: Completing initialization.\n"); |
| 4460 | |
| 4461 | /* Set up any superblocks initialized prior to the policy load. */ |
| 4462 | printk(KERN_INFO "SELinux: Setting up existing superblocks.\n"); |
| 4463 | spin_lock(&sb_security_lock); |
| 4464 | next_sb: |
| 4465 | if (!list_empty(&superblock_security_head)) { |
| 4466 | struct superblock_security_struct *sbsec = |
| 4467 | list_entry(superblock_security_head.next, |
| 4468 | struct superblock_security_struct, |
| 4469 | list); |
| 4470 | struct super_block *sb = sbsec->sb; |
| 4471 | spin_lock(&sb_lock); |
| 4472 | sb->s_count++; |
| 4473 | spin_unlock(&sb_lock); |
| 4474 | spin_unlock(&sb_security_lock); |
| 4475 | down_read(&sb->s_umount); |
| 4476 | if (sb->s_root) |
| 4477 | superblock_doinit(sb, NULL); |
| 4478 | drop_super(sb); |
| 4479 | spin_lock(&sb_security_lock); |
| 4480 | list_del_init(&sbsec->list); |
| 4481 | goto next_sb; |
| 4482 | } |
| 4483 | spin_unlock(&sb_security_lock); |
| 4484 | } |
| 4485 | |
| 4486 | /* SELinux requires early initialization in order to label |
| 4487 | all processes and objects when they are created. */ |
| 4488 | security_initcall(selinux_init); |
| 4489 | |
| 4490 | #if defined(CONFIG_SECURITY_NETWORK) && defined(CONFIG_NETFILTER) |
| 4491 | |
| 4492 | static struct nf_hook_ops selinux_ipv4_op = { |
| 4493 | .hook = selinux_ipv4_postroute_last, |
| 4494 | .owner = THIS_MODULE, |
| 4495 | .pf = PF_INET, |
| 4496 | .hooknum = NF_IP_POST_ROUTING, |
| 4497 | .priority = NF_IP_PRI_SELINUX_LAST, |
| 4498 | }; |
| 4499 | |
| 4500 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 4501 | |
| 4502 | static struct nf_hook_ops selinux_ipv6_op = { |
| 4503 | .hook = selinux_ipv6_postroute_last, |
| 4504 | .owner = THIS_MODULE, |
| 4505 | .pf = PF_INET6, |
| 4506 | .hooknum = NF_IP6_POST_ROUTING, |
| 4507 | .priority = NF_IP6_PRI_SELINUX_LAST, |
| 4508 | }; |
| 4509 | |
| 4510 | #endif /* IPV6 */ |
| 4511 | |
| 4512 | static int __init selinux_nf_ip_init(void) |
| 4513 | { |
| 4514 | int err = 0; |
| 4515 | |
| 4516 | if (!selinux_enabled) |
| 4517 | goto out; |
| 4518 | |
| 4519 | printk(KERN_INFO "SELinux: Registering netfilter hooks\n"); |
| 4520 | |
| 4521 | err = nf_register_hook(&selinux_ipv4_op); |
| 4522 | if (err) |
| 4523 | panic("SELinux: nf_register_hook for IPv4: error %d\n", err); |
| 4524 | |
| 4525 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 4526 | |
| 4527 | err = nf_register_hook(&selinux_ipv6_op); |
| 4528 | if (err) |
| 4529 | panic("SELinux: nf_register_hook for IPv6: error %d\n", err); |
| 4530 | |
| 4531 | #endif /* IPV6 */ |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4533 | out: |
| 4534 | return err; |
| 4535 | } |
| 4536 | |
| 4537 | __initcall(selinux_nf_ip_init); |
| 4538 | |
| 4539 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 4540 | static void selinux_nf_ip_exit(void) |
| 4541 | { |
| 4542 | printk(KERN_INFO "SELinux: Unregistering netfilter hooks\n"); |
| 4543 | |
| 4544 | nf_unregister_hook(&selinux_ipv4_op); |
| 4545 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 4546 | nf_unregister_hook(&selinux_ipv6_op); |
| 4547 | #endif /* IPV6 */ |
| 4548 | } |
| 4549 | #endif |
| 4550 | |
| 4551 | #else /* CONFIG_SECURITY_NETWORK && CONFIG_NETFILTER */ |
| 4552 | |
| 4553 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 4554 | #define selinux_nf_ip_exit() |
| 4555 | #endif |
| 4556 | |
| 4557 | #endif /* CONFIG_SECURITY_NETWORK && CONFIG_NETFILTER */ |
| 4558 | |
| 4559 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 4560 | int selinux_disable(void) |
| 4561 | { |
| 4562 | extern void exit_sel_fs(void); |
| 4563 | static int selinux_disabled = 0; |
| 4564 | |
| 4565 | if (ss_initialized) { |
| 4566 | /* Not permitted after initial policy load. */ |
| 4567 | return -EINVAL; |
| 4568 | } |
| 4569 | |
| 4570 | if (selinux_disabled) { |
| 4571 | /* Only do this once. */ |
| 4572 | return -EINVAL; |
| 4573 | } |
| 4574 | |
| 4575 | printk(KERN_INFO "SELinux: Disabled at runtime.\n"); |
| 4576 | |
| 4577 | selinux_disabled = 1; |
| 4578 | |
| 4579 | /* Reset security_ops to the secondary module, dummy or capability. */ |
| 4580 | security_ops = secondary_ops; |
| 4581 | |
| 4582 | /* Unregister netfilter hooks. */ |
| 4583 | selinux_nf_ip_exit(); |
| 4584 | |
| 4585 | /* Unregister selinuxfs. */ |
| 4586 | exit_sel_fs(); |
| 4587 | |
| 4588 | return 0; |
| 4589 | } |
| 4590 | #endif |
| 4591 | |
| 4592 | |