Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Simplified MAC Kernel (smack) security module |
| 3 | * |
| 4 | * This file contains the smack hook function implementations. |
| 5 | * |
| 6 | * Author: |
| 7 | * Casey Schaufler <casey@schaufler-ca.com> |
| 8 | * |
| 9 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 10 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
| 11 | * Paul Moore <paul.moore@hp.com> |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License version 2, |
| 15 | * as published by the Free Software Foundation. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/xattr.h> |
| 19 | #include <linux/pagemap.h> |
| 20 | #include <linux/mount.h> |
| 21 | #include <linux/stat.h> |
| 22 | #include <linux/ext2_fs.h> |
| 23 | #include <linux/kd.h> |
| 24 | #include <asm/ioctls.h> |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 25 | #include <linux/ip.h> |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 26 | #include <linux/tcp.h> |
| 27 | #include <linux/udp.h> |
| 28 | #include <linux/mutex.h> |
| 29 | #include <linux/pipe_fs_i.h> |
| 30 | #include <net/netlabel.h> |
| 31 | #include <net/cipso_ipv4.h> |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 32 | #include <linux/audit.h> |
Nick Black | 1fd7317d | 2009-09-22 16:43:33 -0700 | [diff] [blame] | 33 | #include <linux/magic.h> |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 34 | #include "smack.h" |
| 35 | |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 36 | #define task_security(task) (task_cred_xxx((task), security)) |
| 37 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 38 | /** |
| 39 | * smk_fetch - Fetch the smack label from a file. |
| 40 | * @ip: a pointer to the inode |
| 41 | * @dp: a pointer to the dentry |
| 42 | * |
| 43 | * Returns a pointer to the master list entry for the Smack label |
| 44 | * or NULL if there was no label to fetch. |
| 45 | */ |
| 46 | static char *smk_fetch(struct inode *ip, struct dentry *dp) |
| 47 | { |
| 48 | int rc; |
| 49 | char in[SMK_LABELLEN]; |
| 50 | |
| 51 | if (ip->i_op->getxattr == NULL) |
| 52 | return NULL; |
| 53 | |
| 54 | rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN); |
| 55 | if (rc < 0) |
| 56 | return NULL; |
| 57 | |
| 58 | return smk_import(in, rc); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * new_inode_smack - allocate an inode security blob |
| 63 | * @smack: a pointer to the Smack label to use in the blob |
| 64 | * |
| 65 | * Returns the new blob or NULL if there's no memory available |
| 66 | */ |
| 67 | struct inode_smack *new_inode_smack(char *smack) |
| 68 | { |
| 69 | struct inode_smack *isp; |
| 70 | |
| 71 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); |
| 72 | if (isp == NULL) |
| 73 | return NULL; |
| 74 | |
| 75 | isp->smk_inode = smack; |
| 76 | isp->smk_flags = 0; |
| 77 | mutex_init(&isp->smk_lock); |
| 78 | |
| 79 | return isp; |
| 80 | } |
| 81 | |
| 82 | /* |
| 83 | * LSM hooks. |
| 84 | * We he, that is fun! |
| 85 | */ |
| 86 | |
| 87 | /** |
Ingo Molnar | 9e48858 | 2009-05-07 19:26:19 +1000 | [diff] [blame] | 88 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 89 | * @ctp: child task pointer |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 90 | * @mode: ptrace attachment mode |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 91 | * |
| 92 | * Returns 0 if access is OK, an error code otherwise |
| 93 | * |
| 94 | * Do the capability checks, and require read and write. |
| 95 | */ |
Ingo Molnar | 9e48858 | 2009-05-07 19:26:19 +1000 | [diff] [blame] | 96 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 97 | { |
| 98 | int rc; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 99 | struct smk_audit_info ad; |
| 100 | char *sp, *tsp; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 101 | |
Ingo Molnar | 9e48858 | 2009-05-07 19:26:19 +1000 | [diff] [blame] | 102 | rc = cap_ptrace_access_check(ctp, mode); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 103 | if (rc != 0) |
| 104 | return rc; |
| 105 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 106 | sp = current_security(); |
| 107 | tsp = task_security(ctp); |
| 108 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
| 109 | smk_ad_setfield_u_tsk(&ad, ctp); |
| 110 | |
| 111 | /* we won't log here, because rc can be overriden */ |
| 112 | rc = smk_access(sp, tsp, MAY_READWRITE, NULL); |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 113 | if (rc != 0 && capable(CAP_MAC_OVERRIDE)) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 114 | rc = 0; |
| 115 | |
| 116 | smack_log(sp, tsp, MAY_READWRITE, rc, &ad); |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 117 | return rc; |
| 118 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 119 | |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 120 | /** |
| 121 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME |
| 122 | * @ptp: parent task pointer |
| 123 | * |
| 124 | * Returns 0 if access is OK, an error code otherwise |
| 125 | * |
| 126 | * Do the capability checks, and require read and write. |
| 127 | */ |
| 128 | static int smack_ptrace_traceme(struct task_struct *ptp) |
| 129 | { |
| 130 | int rc; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 131 | struct smk_audit_info ad; |
| 132 | char *sp, *tsp; |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 133 | |
| 134 | rc = cap_ptrace_traceme(ptp); |
| 135 | if (rc != 0) |
| 136 | return rc; |
| 137 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 138 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
| 139 | smk_ad_setfield_u_tsk(&ad, ptp); |
| 140 | |
| 141 | sp = current_security(); |
| 142 | tsp = task_security(ptp); |
| 143 | /* we won't log here, because rc can be overriden */ |
| 144 | rc = smk_access(tsp, sp, MAY_READWRITE, NULL); |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 145 | if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE)) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 146 | rc = 0; |
| 147 | |
| 148 | smack_log(tsp, sp, MAY_READWRITE, rc, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 149 | return rc; |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * smack_syslog - Smack approval on syslog |
| 154 | * @type: message type |
| 155 | * |
| 156 | * Require that the task has the floor label |
| 157 | * |
| 158 | * Returns 0 on success, error code otherwise. |
| 159 | */ |
| 160 | static int smack_syslog(int type) |
| 161 | { |
| 162 | int rc; |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 163 | char *sp = current_security(); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 164 | |
| 165 | rc = cap_syslog(type); |
| 166 | if (rc != 0) |
| 167 | return rc; |
| 168 | |
| 169 | if (capable(CAP_MAC_OVERRIDE)) |
| 170 | return 0; |
| 171 | |
| 172 | if (sp != smack_known_floor.smk_known) |
| 173 | rc = -EACCES; |
| 174 | |
| 175 | return rc; |
| 176 | } |
| 177 | |
| 178 | |
| 179 | /* |
| 180 | * Superblock Hooks. |
| 181 | */ |
| 182 | |
| 183 | /** |
| 184 | * smack_sb_alloc_security - allocate a superblock blob |
| 185 | * @sb: the superblock getting the blob |
| 186 | * |
| 187 | * Returns 0 on success or -ENOMEM on error. |
| 188 | */ |
| 189 | static int smack_sb_alloc_security(struct super_block *sb) |
| 190 | { |
| 191 | struct superblock_smack *sbsp; |
| 192 | |
| 193 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); |
| 194 | |
| 195 | if (sbsp == NULL) |
| 196 | return -ENOMEM; |
| 197 | |
| 198 | sbsp->smk_root = smack_known_floor.smk_known; |
| 199 | sbsp->smk_default = smack_known_floor.smk_known; |
| 200 | sbsp->smk_floor = smack_known_floor.smk_known; |
| 201 | sbsp->smk_hat = smack_known_hat.smk_known; |
| 202 | sbsp->smk_initialized = 0; |
| 203 | spin_lock_init(&sbsp->smk_sblock); |
| 204 | |
| 205 | sb->s_security = sbsp; |
| 206 | |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | /** |
| 211 | * smack_sb_free_security - free a superblock blob |
| 212 | * @sb: the superblock getting the blob |
| 213 | * |
| 214 | */ |
| 215 | static void smack_sb_free_security(struct super_block *sb) |
| 216 | { |
| 217 | kfree(sb->s_security); |
| 218 | sb->s_security = NULL; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * smack_sb_copy_data - copy mount options data for processing |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 223 | * @orig: where to start |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 224 | * @smackopts: mount options string |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 225 | * |
| 226 | * Returns 0 on success or -ENOMEM on error. |
| 227 | * |
| 228 | * Copy the Smack specific mount options out of the mount |
| 229 | * options list. |
| 230 | */ |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 231 | static int smack_sb_copy_data(char *orig, char *smackopts) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 232 | { |
| 233 | char *cp, *commap, *otheropts, *dp; |
| 234 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 235 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
| 236 | if (otheropts == NULL) |
| 237 | return -ENOMEM; |
| 238 | |
| 239 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { |
| 240 | if (strstr(cp, SMK_FSDEFAULT) == cp) |
| 241 | dp = smackopts; |
| 242 | else if (strstr(cp, SMK_FSFLOOR) == cp) |
| 243 | dp = smackopts; |
| 244 | else if (strstr(cp, SMK_FSHAT) == cp) |
| 245 | dp = smackopts; |
| 246 | else if (strstr(cp, SMK_FSROOT) == cp) |
| 247 | dp = smackopts; |
| 248 | else |
| 249 | dp = otheropts; |
| 250 | |
| 251 | commap = strchr(cp, ','); |
| 252 | if (commap != NULL) |
| 253 | *commap = '\0'; |
| 254 | |
| 255 | if (*dp != '\0') |
| 256 | strcat(dp, ","); |
| 257 | strcat(dp, cp); |
| 258 | } |
| 259 | |
| 260 | strcpy(orig, otheropts); |
| 261 | free_page((unsigned long)otheropts); |
| 262 | |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * smack_sb_kern_mount - Smack specific mount processing |
| 268 | * @sb: the file system superblock |
James Morris | 12204e2 | 2008-12-19 10:44:42 +1100 | [diff] [blame] | 269 | * @flags: the mount flags |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 270 | * @data: the smack mount options |
| 271 | * |
| 272 | * Returns 0 on success, an error code on failure |
| 273 | */ |
James Morris | 12204e2 | 2008-12-19 10:44:42 +1100 | [diff] [blame] | 274 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 275 | { |
| 276 | struct dentry *root = sb->s_root; |
| 277 | struct inode *inode = root->d_inode; |
| 278 | struct superblock_smack *sp = sb->s_security; |
| 279 | struct inode_smack *isp; |
| 280 | char *op; |
| 281 | char *commap; |
| 282 | char *nsp; |
| 283 | |
| 284 | spin_lock(&sp->smk_sblock); |
| 285 | if (sp->smk_initialized != 0) { |
| 286 | spin_unlock(&sp->smk_sblock); |
| 287 | return 0; |
| 288 | } |
| 289 | sp->smk_initialized = 1; |
| 290 | spin_unlock(&sp->smk_sblock); |
| 291 | |
| 292 | for (op = data; op != NULL; op = commap) { |
| 293 | commap = strchr(op, ','); |
| 294 | if (commap != NULL) |
| 295 | *commap++ = '\0'; |
| 296 | |
| 297 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { |
| 298 | op += strlen(SMK_FSHAT); |
| 299 | nsp = smk_import(op, 0); |
| 300 | if (nsp != NULL) |
| 301 | sp->smk_hat = nsp; |
| 302 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { |
| 303 | op += strlen(SMK_FSFLOOR); |
| 304 | nsp = smk_import(op, 0); |
| 305 | if (nsp != NULL) |
| 306 | sp->smk_floor = nsp; |
| 307 | } else if (strncmp(op, SMK_FSDEFAULT, |
| 308 | strlen(SMK_FSDEFAULT)) == 0) { |
| 309 | op += strlen(SMK_FSDEFAULT); |
| 310 | nsp = smk_import(op, 0); |
| 311 | if (nsp != NULL) |
| 312 | sp->smk_default = nsp; |
| 313 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { |
| 314 | op += strlen(SMK_FSROOT); |
| 315 | nsp = smk_import(op, 0); |
| 316 | if (nsp != NULL) |
| 317 | sp->smk_root = nsp; |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * Initialize the root inode. |
| 323 | */ |
| 324 | isp = inode->i_security; |
| 325 | if (isp == NULL) |
| 326 | inode->i_security = new_inode_smack(sp->smk_root); |
| 327 | else |
| 328 | isp->smk_inode = sp->smk_root; |
| 329 | |
| 330 | return 0; |
| 331 | } |
| 332 | |
| 333 | /** |
| 334 | * smack_sb_statfs - Smack check on statfs |
| 335 | * @dentry: identifies the file system in question |
| 336 | * |
| 337 | * Returns 0 if current can read the floor of the filesystem, |
| 338 | * and error code otherwise |
| 339 | */ |
| 340 | static int smack_sb_statfs(struct dentry *dentry) |
| 341 | { |
| 342 | struct superblock_smack *sbp = dentry->d_sb->s_security; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 343 | int rc; |
| 344 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 345 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 346 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 347 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
| 348 | |
| 349 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
| 350 | return rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | /** |
| 354 | * smack_sb_mount - Smack check for mounting |
| 355 | * @dev_name: unused |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 356 | * @path: mount point |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 357 | * @type: unused |
| 358 | * @flags: unused |
| 359 | * @data: unused |
| 360 | * |
| 361 | * Returns 0 if current can write the floor of the filesystem |
| 362 | * being mounted on, an error code otherwise. |
| 363 | */ |
Al Viro | b5266eb | 2008-03-22 17:48:24 -0400 | [diff] [blame] | 364 | static int smack_sb_mount(char *dev_name, struct path *path, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 365 | char *type, unsigned long flags, void *data) |
| 366 | { |
Al Viro | b5266eb | 2008-03-22 17:48:24 -0400 | [diff] [blame] | 367 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 368 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 369 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 370 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 371 | smk_ad_setfield_u_fs_path(&ad, *path); |
| 372 | |
| 373 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 374 | } |
| 375 | |
| 376 | /** |
| 377 | * smack_sb_umount - Smack check for unmounting |
| 378 | * @mnt: file system to unmount |
| 379 | * @flags: unused |
| 380 | * |
| 381 | * Returns 0 if current can write the floor of the filesystem |
| 382 | * being unmounted, an error code otherwise. |
| 383 | */ |
| 384 | static int smack_sb_umount(struct vfsmount *mnt, int flags) |
| 385 | { |
| 386 | struct superblock_smack *sbp; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 387 | struct smk_audit_info ad; |
| 388 | |
| 389 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 390 | smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_mountpoint); |
| 391 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 392 | |
| 393 | sbp = mnt->mnt_sb->s_security; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 394 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | /* |
| 398 | * Inode hooks |
| 399 | */ |
| 400 | |
| 401 | /** |
| 402 | * smack_inode_alloc_security - allocate an inode blob |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 403 | * @inode: the inode in need of a blob |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 404 | * |
| 405 | * Returns 0 if it gets a blob, -ENOMEM otherwise |
| 406 | */ |
| 407 | static int smack_inode_alloc_security(struct inode *inode) |
| 408 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 409 | inode->i_security = new_inode_smack(current_security()); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 410 | if (inode->i_security == NULL) |
| 411 | return -ENOMEM; |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | /** |
| 416 | * smack_inode_free_security - free an inode blob |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 417 | * @inode: the inode with a blob |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 418 | * |
| 419 | * Clears the blob pointer in inode |
| 420 | */ |
| 421 | static void smack_inode_free_security(struct inode *inode) |
| 422 | { |
| 423 | kfree(inode->i_security); |
| 424 | inode->i_security = NULL; |
| 425 | } |
| 426 | |
| 427 | /** |
| 428 | * smack_inode_init_security - copy out the smack from an inode |
| 429 | * @inode: the inode |
| 430 | * @dir: unused |
| 431 | * @name: where to put the attribute name |
| 432 | * @value: where to put the attribute value |
| 433 | * @len: where to put the length of the attribute |
| 434 | * |
| 435 | * Returns 0 if it all works out, -ENOMEM if there's no memory |
| 436 | */ |
| 437 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, |
| 438 | char **name, void **value, size_t *len) |
| 439 | { |
| 440 | char *isp = smk_of_inode(inode); |
| 441 | |
| 442 | if (name) { |
| 443 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); |
| 444 | if (*name == NULL) |
| 445 | return -ENOMEM; |
| 446 | } |
| 447 | |
| 448 | if (value) { |
| 449 | *value = kstrdup(isp, GFP_KERNEL); |
| 450 | if (*value == NULL) |
| 451 | return -ENOMEM; |
| 452 | } |
| 453 | |
| 454 | if (len) |
| 455 | *len = strlen(isp) + 1; |
| 456 | |
| 457 | return 0; |
| 458 | } |
| 459 | |
| 460 | /** |
| 461 | * smack_inode_link - Smack check on link |
| 462 | * @old_dentry: the existing object |
| 463 | * @dir: unused |
| 464 | * @new_dentry: the new object |
| 465 | * |
| 466 | * Returns 0 if access is permitted, an error code otherwise |
| 467 | */ |
| 468 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, |
| 469 | struct dentry *new_dentry) |
| 470 | { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 471 | char *isp; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 472 | struct smk_audit_info ad; |
| 473 | int rc; |
| 474 | |
| 475 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 476 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 477 | |
| 478 | isp = smk_of_inode(old_dentry->d_inode); |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 479 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 480 | |
| 481 | if (rc == 0 && new_dentry->d_inode != NULL) { |
| 482 | isp = smk_of_inode(new_dentry->d_inode); |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 483 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
| 484 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 485 | } |
| 486 | |
| 487 | return rc; |
| 488 | } |
| 489 | |
| 490 | /** |
| 491 | * smack_inode_unlink - Smack check on inode deletion |
| 492 | * @dir: containing directory object |
| 493 | * @dentry: file to unlink |
| 494 | * |
| 495 | * Returns 0 if current can write the containing directory |
| 496 | * and the object, error code otherwise |
| 497 | */ |
| 498 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) |
| 499 | { |
| 500 | struct inode *ip = dentry->d_inode; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 501 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 502 | int rc; |
| 503 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 504 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 505 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
| 506 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 507 | /* |
| 508 | * You need write access to the thing you're unlinking |
| 509 | */ |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 510 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
| 511 | if (rc == 0) { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 512 | /* |
| 513 | * You also need write access to the containing directory |
| 514 | */ |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 515 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
| 516 | smk_ad_setfield_u_fs_inode(&ad, dir); |
| 517 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); |
| 518 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 519 | return rc; |
| 520 | } |
| 521 | |
| 522 | /** |
| 523 | * smack_inode_rmdir - Smack check on directory deletion |
| 524 | * @dir: containing directory object |
| 525 | * @dentry: directory to unlink |
| 526 | * |
| 527 | * Returns 0 if current can write the containing directory |
| 528 | * and the directory, error code otherwise |
| 529 | */ |
| 530 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) |
| 531 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 532 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 533 | int rc; |
| 534 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 535 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 536 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
| 537 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 538 | /* |
| 539 | * You need write access to the thing you're removing |
| 540 | */ |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 541 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
| 542 | if (rc == 0) { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 543 | /* |
| 544 | * You also need write access to the containing directory |
| 545 | */ |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 546 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
| 547 | smk_ad_setfield_u_fs_inode(&ad, dir); |
| 548 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); |
| 549 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 550 | |
| 551 | return rc; |
| 552 | } |
| 553 | |
| 554 | /** |
| 555 | * smack_inode_rename - Smack check on rename |
| 556 | * @old_inode: the old directory |
| 557 | * @old_dentry: unused |
| 558 | * @new_inode: the new directory |
| 559 | * @new_dentry: unused |
| 560 | * |
| 561 | * Read and write access is required on both the old and |
| 562 | * new directories. |
| 563 | * |
| 564 | * Returns 0 if access is permitted, an error code otherwise |
| 565 | */ |
| 566 | static int smack_inode_rename(struct inode *old_inode, |
| 567 | struct dentry *old_dentry, |
| 568 | struct inode *new_inode, |
| 569 | struct dentry *new_dentry) |
| 570 | { |
| 571 | int rc; |
| 572 | char *isp; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 573 | struct smk_audit_info ad; |
| 574 | |
| 575 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 576 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 577 | |
| 578 | isp = smk_of_inode(old_dentry->d_inode); |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 579 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 580 | |
| 581 | if (rc == 0 && new_dentry->d_inode != NULL) { |
| 582 | isp = smk_of_inode(new_dentry->d_inode); |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 583 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
| 584 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 585 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 586 | return rc; |
| 587 | } |
| 588 | |
| 589 | /** |
| 590 | * smack_inode_permission - Smack version of permission() |
| 591 | * @inode: the inode in question |
| 592 | * @mask: the access requested |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 593 | * |
| 594 | * This is the important Smack hook. |
| 595 | * |
| 596 | * Returns 0 if access is permitted, -EACCES otherwise |
| 597 | */ |
Al Viro | b77b064 | 2008-07-17 09:37:02 -0400 | [diff] [blame] | 598 | static int smack_inode_permission(struct inode *inode, int mask) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 599 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 600 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 601 | /* |
| 602 | * No permission to check. Existence test. Yup, it's there. |
| 603 | */ |
| 604 | if (mask == 0) |
| 605 | return 0; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 606 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 607 | smk_ad_setfield_u_fs_inode(&ad, inode); |
| 608 | return smk_curacc(smk_of_inode(inode), mask, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 609 | } |
| 610 | |
| 611 | /** |
| 612 | * smack_inode_setattr - Smack check for setting attributes |
| 613 | * @dentry: the object |
| 614 | * @iattr: for the force flag |
| 615 | * |
| 616 | * Returns 0 if access is permitted, an error code otherwise |
| 617 | */ |
| 618 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) |
| 619 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 620 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 621 | /* |
| 622 | * Need to allow for clearing the setuid bit. |
| 623 | */ |
| 624 | if (iattr->ia_valid & ATTR_FORCE) |
| 625 | return 0; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 626 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 627 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 628 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 629 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 630 | } |
| 631 | |
| 632 | /** |
| 633 | * smack_inode_getattr - Smack check for getting attributes |
| 634 | * @mnt: unused |
| 635 | * @dentry: the object |
| 636 | * |
| 637 | * Returns 0 if access is permitted, an error code otherwise |
| 638 | */ |
| 639 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) |
| 640 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 641 | struct smk_audit_info ad; |
| 642 | |
| 643 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 644 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
| 645 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); |
| 646 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 647 | } |
| 648 | |
| 649 | /** |
| 650 | * smack_inode_setxattr - Smack check for setting xattrs |
| 651 | * @dentry: the object |
| 652 | * @name: name of the attribute |
| 653 | * @value: unused |
| 654 | * @size: unused |
| 655 | * @flags: unused |
| 656 | * |
| 657 | * This protects the Smack attribute explicitly. |
| 658 | * |
| 659 | * Returns 0 if access is permitted, an error code otherwise |
| 660 | */ |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 661 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
| 662 | const void *value, size_t size, int flags) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 663 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 664 | struct smk_audit_info ad; |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 665 | int rc = 0; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 666 | |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 667 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
| 668 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || |
| 669 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
| 670 | if (!capable(CAP_MAC_ADMIN)) |
| 671 | rc = -EPERM; |
Etienne Basset | defc433 | 2009-04-16 23:58:42 +0200 | [diff] [blame] | 672 | /* |
| 673 | * check label validity here so import wont fail on |
| 674 | * post_setxattr |
| 675 | */ |
| 676 | if (size == 0 || size >= SMK_LABELLEN || |
| 677 | smk_import(value, size) == NULL) |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 678 | rc = -EINVAL; |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 679 | } else |
| 680 | rc = cap_inode_setxattr(dentry, name, value, size, flags); |
| 681 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 682 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 683 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
| 684 | |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 685 | if (rc == 0) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 686 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 687 | |
| 688 | return rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 689 | } |
| 690 | |
| 691 | /** |
| 692 | * smack_inode_post_setxattr - Apply the Smack update approved above |
| 693 | * @dentry: object |
| 694 | * @name: attribute name |
| 695 | * @value: attribute value |
| 696 | * @size: attribute size |
| 697 | * @flags: unused |
| 698 | * |
| 699 | * Set the pointer in the inode blob to the entry found |
| 700 | * in the master label list. |
| 701 | */ |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 702 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
| 703 | const void *value, size_t size, int flags) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 704 | { |
| 705 | struct inode_smack *isp; |
| 706 | char *nsp; |
| 707 | |
| 708 | /* |
| 709 | * Not SMACK |
| 710 | */ |
| 711 | if (strcmp(name, XATTR_NAME_SMACK)) |
| 712 | return; |
| 713 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 714 | isp = dentry->d_inode->i_security; |
| 715 | |
| 716 | /* |
| 717 | * No locking is done here. This is a pointer |
| 718 | * assignment. |
| 719 | */ |
| 720 | nsp = smk_import(value, size); |
| 721 | if (nsp != NULL) |
| 722 | isp->smk_inode = nsp; |
| 723 | else |
| 724 | isp->smk_inode = smack_known_invalid.smk_known; |
| 725 | |
| 726 | return; |
| 727 | } |
| 728 | |
| 729 | /* |
| 730 | * smack_inode_getxattr - Smack check on getxattr |
| 731 | * @dentry: the object |
| 732 | * @name: unused |
| 733 | * |
| 734 | * Returns 0 if access is permitted, an error code otherwise |
| 735 | */ |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 736 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 737 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 738 | struct smk_audit_info ad; |
| 739 | |
| 740 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 741 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
| 742 | |
| 743 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 744 | } |
| 745 | |
| 746 | /* |
| 747 | * smack_inode_removexattr - Smack check on removexattr |
| 748 | * @dentry: the object |
| 749 | * @name: name of the attribute |
| 750 | * |
| 751 | * Removing the Smack attribute requires CAP_MAC_ADMIN |
| 752 | * |
| 753 | * Returns 0 if access is permitted, an error code otherwise |
| 754 | */ |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 755 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 756 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 757 | struct smk_audit_info ad; |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 758 | int rc = 0; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 759 | |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 760 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
| 761 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || |
| 762 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
| 763 | if (!capable(CAP_MAC_ADMIN)) |
| 764 | rc = -EPERM; |
| 765 | } else |
| 766 | rc = cap_inode_removexattr(dentry, name); |
| 767 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 768 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 769 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 770 | if (rc == 0) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 771 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 772 | |
| 773 | return rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 774 | } |
| 775 | |
| 776 | /** |
| 777 | * smack_inode_getsecurity - get smack xattrs |
| 778 | * @inode: the object |
| 779 | * @name: attribute name |
| 780 | * @buffer: where to put the result |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 781 | * @alloc: unused |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 782 | * |
| 783 | * Returns the size of the attribute or an error code |
| 784 | */ |
| 785 | static int smack_inode_getsecurity(const struct inode *inode, |
| 786 | const char *name, void **buffer, |
| 787 | bool alloc) |
| 788 | { |
| 789 | struct socket_smack *ssp; |
| 790 | struct socket *sock; |
| 791 | struct super_block *sbp; |
| 792 | struct inode *ip = (struct inode *)inode; |
| 793 | char *isp; |
| 794 | int ilen; |
| 795 | int rc = 0; |
| 796 | |
| 797 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { |
| 798 | isp = smk_of_inode(inode); |
| 799 | ilen = strlen(isp) + 1; |
| 800 | *buffer = isp; |
| 801 | return ilen; |
| 802 | } |
| 803 | |
| 804 | /* |
| 805 | * The rest of the Smack xattrs are only on sockets. |
| 806 | */ |
| 807 | sbp = ip->i_sb; |
| 808 | if (sbp->s_magic != SOCKFS_MAGIC) |
| 809 | return -EOPNOTSUPP; |
| 810 | |
| 811 | sock = SOCKET_I(ip); |
Ahmed S. Darwish | 2e1d146 | 2008-02-13 15:03:34 -0800 | [diff] [blame] | 812 | if (sock == NULL || sock->sk == NULL) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 813 | return -EOPNOTSUPP; |
| 814 | |
| 815 | ssp = sock->sk->sk_security; |
| 816 | |
| 817 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
| 818 | isp = ssp->smk_in; |
| 819 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) |
| 820 | isp = ssp->smk_out; |
| 821 | else |
| 822 | return -EOPNOTSUPP; |
| 823 | |
| 824 | ilen = strlen(isp) + 1; |
| 825 | if (rc == 0) { |
| 826 | *buffer = isp; |
| 827 | rc = ilen; |
| 828 | } |
| 829 | |
| 830 | return rc; |
| 831 | } |
| 832 | |
| 833 | |
| 834 | /** |
| 835 | * smack_inode_listsecurity - list the Smack attributes |
| 836 | * @inode: the object |
| 837 | * @buffer: where they go |
| 838 | * @buffer_size: size of buffer |
| 839 | * |
| 840 | * Returns 0 on success, -EINVAL otherwise |
| 841 | */ |
| 842 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, |
| 843 | size_t buffer_size) |
| 844 | { |
| 845 | int len = strlen(XATTR_NAME_SMACK); |
| 846 | |
| 847 | if (buffer != NULL && len <= buffer_size) { |
| 848 | memcpy(buffer, XATTR_NAME_SMACK, len); |
| 849 | return len; |
| 850 | } |
| 851 | return -EINVAL; |
| 852 | } |
| 853 | |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 854 | /** |
| 855 | * smack_inode_getsecid - Extract inode's security id |
| 856 | * @inode: inode to extract the info from |
| 857 | * @secid: where result will be saved |
| 858 | */ |
| 859 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) |
| 860 | { |
| 861 | struct inode_smack *isp = inode->i_security; |
| 862 | |
| 863 | *secid = smack_to_secid(isp->smk_inode); |
| 864 | } |
| 865 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 866 | /* |
| 867 | * File Hooks |
| 868 | */ |
| 869 | |
| 870 | /** |
| 871 | * smack_file_permission - Smack check on file operations |
| 872 | * @file: unused |
| 873 | * @mask: unused |
| 874 | * |
| 875 | * Returns 0 |
| 876 | * |
| 877 | * Should access checks be done on each read or write? |
| 878 | * UNICOS and SELinux say yes. |
| 879 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. |
| 880 | * |
| 881 | * I'll say no for now. Smack does not do the frequent |
| 882 | * label changing that SELinux does. |
| 883 | */ |
| 884 | static int smack_file_permission(struct file *file, int mask) |
| 885 | { |
| 886 | return 0; |
| 887 | } |
| 888 | |
| 889 | /** |
| 890 | * smack_file_alloc_security - assign a file security blob |
| 891 | * @file: the object |
| 892 | * |
| 893 | * The security blob for a file is a pointer to the master |
| 894 | * label list, so no allocation is done. |
| 895 | * |
| 896 | * Returns 0 |
| 897 | */ |
| 898 | static int smack_file_alloc_security(struct file *file) |
| 899 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 900 | file->f_security = current_security(); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 901 | return 0; |
| 902 | } |
| 903 | |
| 904 | /** |
| 905 | * smack_file_free_security - clear a file security blob |
| 906 | * @file: the object |
| 907 | * |
| 908 | * The security blob for a file is a pointer to the master |
| 909 | * label list, so no memory is freed. |
| 910 | */ |
| 911 | static void smack_file_free_security(struct file *file) |
| 912 | { |
| 913 | file->f_security = NULL; |
| 914 | } |
| 915 | |
| 916 | /** |
| 917 | * smack_file_ioctl - Smack check on ioctls |
| 918 | * @file: the object |
| 919 | * @cmd: what to do |
| 920 | * @arg: unused |
| 921 | * |
| 922 | * Relies heavily on the correct use of the ioctl command conventions. |
| 923 | * |
| 924 | * Returns 0 if allowed, error code otherwise |
| 925 | */ |
| 926 | static int smack_file_ioctl(struct file *file, unsigned int cmd, |
| 927 | unsigned long arg) |
| 928 | { |
| 929 | int rc = 0; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 930 | struct smk_audit_info ad; |
| 931 | |
| 932 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 933 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 934 | |
| 935 | if (_IOC_DIR(cmd) & _IOC_WRITE) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 936 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 937 | |
| 938 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 939 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 940 | |
| 941 | return rc; |
| 942 | } |
| 943 | |
| 944 | /** |
| 945 | * smack_file_lock - Smack check on file locking |
| 946 | * @file: the object |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 947 | * @cmd: unused |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 948 | * |
| 949 | * Returns 0 if current has write access, error code otherwise |
| 950 | */ |
| 951 | static int smack_file_lock(struct file *file, unsigned int cmd) |
| 952 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 953 | struct smk_audit_info ad; |
| 954 | |
| 955 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 956 | smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry); |
| 957 | return smk_curacc(file->f_security, MAY_WRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 958 | } |
| 959 | |
| 960 | /** |
| 961 | * smack_file_fcntl - Smack check on fcntl |
| 962 | * @file: the object |
| 963 | * @cmd: what action to check |
| 964 | * @arg: unused |
| 965 | * |
| 966 | * Returns 0 if current has access, error code otherwise |
| 967 | */ |
| 968 | static int smack_file_fcntl(struct file *file, unsigned int cmd, |
| 969 | unsigned long arg) |
| 970 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 971 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 972 | int rc; |
| 973 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 974 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
| 975 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
| 976 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 977 | switch (cmd) { |
| 978 | case F_DUPFD: |
| 979 | case F_GETFD: |
| 980 | case F_GETFL: |
| 981 | case F_GETLK: |
| 982 | case F_GETOWN: |
| 983 | case F_GETSIG: |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 984 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 985 | break; |
| 986 | case F_SETFD: |
| 987 | case F_SETFL: |
| 988 | case F_SETLK: |
| 989 | case F_SETLKW: |
| 990 | case F_SETOWN: |
| 991 | case F_SETSIG: |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 992 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 993 | break; |
| 994 | default: |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 995 | rc = smk_curacc(file->f_security, MAY_READWRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 996 | } |
| 997 | |
| 998 | return rc; |
| 999 | } |
| 1000 | |
| 1001 | /** |
| 1002 | * smack_file_set_fowner - set the file security blob value |
| 1003 | * @file: object in question |
| 1004 | * |
| 1005 | * Returns 0 |
| 1006 | * Further research may be required on this one. |
| 1007 | */ |
| 1008 | static int smack_file_set_fowner(struct file *file) |
| 1009 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 1010 | file->f_security = current_security(); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1011 | return 0; |
| 1012 | } |
| 1013 | |
| 1014 | /** |
| 1015 | * smack_file_send_sigiotask - Smack on sigio |
| 1016 | * @tsk: The target task |
| 1017 | * @fown: the object the signal come from |
| 1018 | * @signum: unused |
| 1019 | * |
| 1020 | * Allow a privileged task to get signals even if it shouldn't |
| 1021 | * |
| 1022 | * Returns 0 if a subject with the object's smack could |
| 1023 | * write to the task, an error code otherwise. |
| 1024 | */ |
| 1025 | static int smack_file_send_sigiotask(struct task_struct *tsk, |
| 1026 | struct fown_struct *fown, int signum) |
| 1027 | { |
| 1028 | struct file *file; |
| 1029 | int rc; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1030 | char *tsp = tsk->cred->security; |
| 1031 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1032 | |
| 1033 | /* |
| 1034 | * struct fown_struct is never outside the context of a struct file |
| 1035 | */ |
| 1036 | file = container_of(fown, struct file, f_owner); |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1037 | /* we don't log here as rc can be overriden */ |
| 1038 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1039 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1040 | rc = 0; |
| 1041 | |
| 1042 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
| 1043 | smk_ad_setfield_u_tsk(&ad, tsk); |
| 1044 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1045 | return rc; |
| 1046 | } |
| 1047 | |
| 1048 | /** |
| 1049 | * smack_file_receive - Smack file receive check |
| 1050 | * @file: the object |
| 1051 | * |
| 1052 | * Returns 0 if current has access, error code otherwise |
| 1053 | */ |
| 1054 | static int smack_file_receive(struct file *file) |
| 1055 | { |
| 1056 | int may = 0; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1057 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1058 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1059 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
| 1060 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1061 | /* |
| 1062 | * This code relies on bitmasks. |
| 1063 | */ |
| 1064 | if (file->f_mode & FMODE_READ) |
| 1065 | may = MAY_READ; |
| 1066 | if (file->f_mode & FMODE_WRITE) |
| 1067 | may |= MAY_WRITE; |
| 1068 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1069 | return smk_curacc(file->f_security, may, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1070 | } |
| 1071 | |
| 1072 | /* |
| 1073 | * Task hooks |
| 1074 | */ |
| 1075 | |
| 1076 | /** |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1077 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials |
| 1078 | * @new: the new credentials |
| 1079 | * @gfp: the atomicity of any memory allocations |
| 1080 | * |
| 1081 | * Prepare a blank set of credentials for modification. This must allocate all |
| 1082 | * the memory the LSM module might require such that cred_transfer() can |
| 1083 | * complete without error. |
| 1084 | */ |
| 1085 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) |
| 1086 | { |
| 1087 | cred->security = NULL; |
| 1088 | return 0; |
| 1089 | } |
| 1090 | |
| 1091 | |
| 1092 | /** |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 1093 | * smack_cred_free - "free" task-level security credentials |
| 1094 | * @cred: the credentials in question |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1095 | * |
| 1096 | * Smack isn't using copies of blobs. Everyone |
| 1097 | * points to an immutable list. The blobs never go away. |
| 1098 | * There is no leak here. |
| 1099 | */ |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 1100 | static void smack_cred_free(struct cred *cred) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1101 | { |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 1102 | cred->security = NULL; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1103 | } |
| 1104 | |
| 1105 | /** |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1106 | * smack_cred_prepare - prepare new set of credentials for modification |
| 1107 | * @new: the new credentials |
| 1108 | * @old: the original credentials |
| 1109 | * @gfp: the atomicity of any memory allocations |
| 1110 | * |
| 1111 | * Prepare a new set of credentials for modification. |
| 1112 | */ |
| 1113 | static int smack_cred_prepare(struct cred *new, const struct cred *old, |
| 1114 | gfp_t gfp) |
| 1115 | { |
| 1116 | new->security = old->security; |
| 1117 | return 0; |
| 1118 | } |
| 1119 | |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1120 | /** |
| 1121 | * smack_cred_commit - commit new credentials |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1122 | * @new: the new credentials |
| 1123 | * @old: the original credentials |
| 1124 | */ |
| 1125 | static void smack_cred_commit(struct cred *new, const struct cred *old) |
| 1126 | { |
| 1127 | } |
| 1128 | |
| 1129 | /** |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1130 | * smack_cred_transfer - Transfer the old credentials to the new credentials |
| 1131 | * @new: the new credentials |
| 1132 | * @old: the original credentials |
| 1133 | * |
| 1134 | * Fill in a set of blank credentials from another set of credentials. |
| 1135 | */ |
| 1136 | static void smack_cred_transfer(struct cred *new, const struct cred *old) |
| 1137 | { |
| 1138 | new->security = old->security; |
| 1139 | } |
| 1140 | |
| 1141 | /** |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 1142 | * smack_kernel_act_as - Set the subjective context in a set of credentials |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1143 | * @new: points to the set of credentials to be modified. |
| 1144 | * @secid: specifies the security ID to be set |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 1145 | * |
| 1146 | * Set the security data for a kernel service. |
| 1147 | */ |
| 1148 | static int smack_kernel_act_as(struct cred *new, u32 secid) |
| 1149 | { |
| 1150 | char *smack = smack_from_secid(secid); |
| 1151 | |
| 1152 | if (smack == NULL) |
| 1153 | return -EINVAL; |
| 1154 | |
| 1155 | new->security = smack; |
| 1156 | return 0; |
| 1157 | } |
| 1158 | |
| 1159 | /** |
| 1160 | * smack_kernel_create_files_as - Set the file creation label in a set of creds |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1161 | * @new: points to the set of credentials to be modified |
| 1162 | * @inode: points to the inode to use as a reference |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 1163 | * |
| 1164 | * Set the file creation context in a set of credentials to the same |
| 1165 | * as the objective context of the specified inode |
| 1166 | */ |
| 1167 | static int smack_kernel_create_files_as(struct cred *new, |
| 1168 | struct inode *inode) |
| 1169 | { |
| 1170 | struct inode_smack *isp = inode->i_security; |
| 1171 | |
| 1172 | new->security = isp->smk_inode; |
| 1173 | return 0; |
| 1174 | } |
| 1175 | |
| 1176 | /** |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1177 | * smk_curacc_on_task - helper to log task related access |
| 1178 | * @p: the task object |
| 1179 | * @access : the access requested |
| 1180 | * |
| 1181 | * Return 0 if access is permitted |
| 1182 | */ |
| 1183 | static int smk_curacc_on_task(struct task_struct *p, int access) |
| 1184 | { |
| 1185 | struct smk_audit_info ad; |
| 1186 | |
| 1187 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
| 1188 | smk_ad_setfield_u_tsk(&ad, p); |
| 1189 | return smk_curacc(task_security(p), access, &ad); |
| 1190 | } |
| 1191 | |
| 1192 | /** |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1193 | * smack_task_setpgid - Smack check on setting pgid |
| 1194 | * @p: the task object |
| 1195 | * @pgid: unused |
| 1196 | * |
| 1197 | * Return 0 if write access is permitted |
| 1198 | */ |
| 1199 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) |
| 1200 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1201 | return smk_curacc_on_task(p, MAY_WRITE); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1202 | } |
| 1203 | |
| 1204 | /** |
| 1205 | * smack_task_getpgid - Smack access check for getpgid |
| 1206 | * @p: the object task |
| 1207 | * |
| 1208 | * Returns 0 if current can read the object task, error code otherwise |
| 1209 | */ |
| 1210 | static int smack_task_getpgid(struct task_struct *p) |
| 1211 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1212 | return smk_curacc_on_task(p, MAY_READ); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1213 | } |
| 1214 | |
| 1215 | /** |
| 1216 | * smack_task_getsid - Smack access check for getsid |
| 1217 | * @p: the object task |
| 1218 | * |
| 1219 | * Returns 0 if current can read the object task, error code otherwise |
| 1220 | */ |
| 1221 | static int smack_task_getsid(struct task_struct *p) |
| 1222 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1223 | return smk_curacc_on_task(p, MAY_READ); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1224 | } |
| 1225 | |
| 1226 | /** |
| 1227 | * smack_task_getsecid - get the secid of the task |
| 1228 | * @p: the object task |
| 1229 | * @secid: where to put the result |
| 1230 | * |
| 1231 | * Sets the secid to contain a u32 version of the smack label. |
| 1232 | */ |
| 1233 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) |
| 1234 | { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1235 | *secid = smack_to_secid(task_security(p)); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1236 | } |
| 1237 | |
| 1238 | /** |
| 1239 | * smack_task_setnice - Smack check on setting nice |
| 1240 | * @p: the task object |
| 1241 | * @nice: unused |
| 1242 | * |
| 1243 | * Return 0 if write access is permitted |
| 1244 | */ |
| 1245 | static int smack_task_setnice(struct task_struct *p, int nice) |
| 1246 | { |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 1247 | int rc; |
| 1248 | |
| 1249 | rc = cap_task_setnice(p, nice); |
| 1250 | if (rc == 0) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1251 | rc = smk_curacc_on_task(p, MAY_WRITE); |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 1252 | return rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1253 | } |
| 1254 | |
| 1255 | /** |
| 1256 | * smack_task_setioprio - Smack check on setting ioprio |
| 1257 | * @p: the task object |
| 1258 | * @ioprio: unused |
| 1259 | * |
| 1260 | * Return 0 if write access is permitted |
| 1261 | */ |
| 1262 | static int smack_task_setioprio(struct task_struct *p, int ioprio) |
| 1263 | { |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 1264 | int rc; |
| 1265 | |
| 1266 | rc = cap_task_setioprio(p, ioprio); |
| 1267 | if (rc == 0) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1268 | rc = smk_curacc_on_task(p, MAY_WRITE); |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 1269 | return rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1270 | } |
| 1271 | |
| 1272 | /** |
| 1273 | * smack_task_getioprio - Smack check on reading ioprio |
| 1274 | * @p: the task object |
| 1275 | * |
| 1276 | * Return 0 if read access is permitted |
| 1277 | */ |
| 1278 | static int smack_task_getioprio(struct task_struct *p) |
| 1279 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1280 | return smk_curacc_on_task(p, MAY_READ); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1281 | } |
| 1282 | |
| 1283 | /** |
| 1284 | * smack_task_setscheduler - Smack check on setting scheduler |
| 1285 | * @p: the task object |
| 1286 | * @policy: unused |
| 1287 | * @lp: unused |
| 1288 | * |
| 1289 | * Return 0 if read access is permitted |
| 1290 | */ |
| 1291 | static int smack_task_setscheduler(struct task_struct *p, int policy, |
| 1292 | struct sched_param *lp) |
| 1293 | { |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 1294 | int rc; |
| 1295 | |
| 1296 | rc = cap_task_setscheduler(p, policy, lp); |
| 1297 | if (rc == 0) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1298 | rc = smk_curacc_on_task(p, MAY_WRITE); |
Casey Schaufler | bcdca22 | 2008-02-23 15:24:04 -0800 | [diff] [blame] | 1299 | return rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1300 | } |
| 1301 | |
| 1302 | /** |
| 1303 | * smack_task_getscheduler - Smack check on reading scheduler |
| 1304 | * @p: the task object |
| 1305 | * |
| 1306 | * Return 0 if read access is permitted |
| 1307 | */ |
| 1308 | static int smack_task_getscheduler(struct task_struct *p) |
| 1309 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1310 | return smk_curacc_on_task(p, MAY_READ); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1311 | } |
| 1312 | |
| 1313 | /** |
| 1314 | * smack_task_movememory - Smack check on moving memory |
| 1315 | * @p: the task object |
| 1316 | * |
| 1317 | * Return 0 if write access is permitted |
| 1318 | */ |
| 1319 | static int smack_task_movememory(struct task_struct *p) |
| 1320 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1321 | return smk_curacc_on_task(p, MAY_WRITE); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1322 | } |
| 1323 | |
| 1324 | /** |
| 1325 | * smack_task_kill - Smack check on signal delivery |
| 1326 | * @p: the task object |
| 1327 | * @info: unused |
| 1328 | * @sig: unused |
| 1329 | * @secid: identifies the smack to use in lieu of current's |
| 1330 | * |
| 1331 | * Return 0 if write access is permitted |
| 1332 | * |
| 1333 | * The secid behavior is an artifact of an SELinux hack |
| 1334 | * in the USB code. Someday it may go away. |
| 1335 | */ |
| 1336 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, |
| 1337 | int sig, u32 secid) |
| 1338 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1339 | struct smk_audit_info ad; |
| 1340 | |
| 1341 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
| 1342 | smk_ad_setfield_u_tsk(&ad, p); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1343 | /* |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1344 | * Sending a signal requires that the sender |
| 1345 | * can write the receiver. |
| 1346 | */ |
| 1347 | if (secid == 0) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1348 | return smk_curacc(task_security(p), MAY_WRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1349 | /* |
| 1350 | * If the secid isn't 0 we're dealing with some USB IO |
| 1351 | * specific behavior. This is not clean. For one thing |
| 1352 | * we can't take privilege into account. |
| 1353 | */ |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1354 | return smk_access(smack_from_secid(secid), task_security(p), |
| 1355 | MAY_WRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1356 | } |
| 1357 | |
| 1358 | /** |
| 1359 | * smack_task_wait - Smack access check for waiting |
| 1360 | * @p: task to wait for |
| 1361 | * |
| 1362 | * Returns 0 if current can wait for p, error code otherwise |
| 1363 | */ |
| 1364 | static int smack_task_wait(struct task_struct *p) |
| 1365 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1366 | struct smk_audit_info ad; |
| 1367 | char *sp = current_security(); |
| 1368 | char *tsp = task_security(p); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1369 | int rc; |
| 1370 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1371 | /* we don't log here, we can be overriden */ |
| 1372 | rc = smk_access(sp, tsp, MAY_WRITE, NULL); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1373 | if (rc == 0) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1374 | goto out_log; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1375 | |
| 1376 | /* |
| 1377 | * Allow the operation to succeed if either task |
| 1378 | * has privilege to perform operations that might |
| 1379 | * account for the smack labels having gotten to |
| 1380 | * be different in the first place. |
| 1381 | * |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1382 | * This breaks the strict subject/object access |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1383 | * control ideal, taking the object's privilege |
| 1384 | * state into account in the decision as well as |
| 1385 | * the smack value. |
| 1386 | */ |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1387 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1388 | rc = 0; |
| 1389 | /* we log only if we didn't get overriden */ |
| 1390 | out_log: |
| 1391 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
| 1392 | smk_ad_setfield_u_tsk(&ad, p); |
| 1393 | smack_log(sp, tsp, MAY_WRITE, rc, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1394 | return rc; |
| 1395 | } |
| 1396 | |
| 1397 | /** |
| 1398 | * smack_task_to_inode - copy task smack into the inode blob |
| 1399 | * @p: task to copy from |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1400 | * @inode: inode to copy to |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1401 | * |
| 1402 | * Sets the smack pointer in the inode security blob |
| 1403 | */ |
| 1404 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) |
| 1405 | { |
| 1406 | struct inode_smack *isp = inode->i_security; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1407 | isp->smk_inode = task_security(p); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1408 | } |
| 1409 | |
| 1410 | /* |
| 1411 | * Socket hooks. |
| 1412 | */ |
| 1413 | |
| 1414 | /** |
| 1415 | * smack_sk_alloc_security - Allocate a socket blob |
| 1416 | * @sk: the socket |
| 1417 | * @family: unused |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1418 | * @gfp_flags: memory allocation flags |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1419 | * |
| 1420 | * Assign Smack pointers to current |
| 1421 | * |
| 1422 | * Returns 0 on success, -ENOMEM is there's no memory |
| 1423 | */ |
| 1424 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) |
| 1425 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 1426 | char *csp = current_security(); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1427 | struct socket_smack *ssp; |
| 1428 | |
| 1429 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); |
| 1430 | if (ssp == NULL) |
| 1431 | return -ENOMEM; |
| 1432 | |
| 1433 | ssp->smk_in = csp; |
| 1434 | ssp->smk_out = csp; |
| 1435 | ssp->smk_packet[0] = '\0'; |
| 1436 | |
| 1437 | sk->sk_security = ssp; |
| 1438 | |
| 1439 | return 0; |
| 1440 | } |
| 1441 | |
| 1442 | /** |
| 1443 | * smack_sk_free_security - Free a socket blob |
| 1444 | * @sk: the socket |
| 1445 | * |
| 1446 | * Clears the blob pointer |
| 1447 | */ |
| 1448 | static void smack_sk_free_security(struct sock *sk) |
| 1449 | { |
| 1450 | kfree(sk->sk_security); |
| 1451 | } |
| 1452 | |
| 1453 | /** |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 1454 | * smack_host_label - check host based restrictions |
| 1455 | * @sip: the object end |
| 1456 | * |
| 1457 | * looks for host based access restrictions |
| 1458 | * |
| 1459 | * This version will only be appropriate for really small sets of single label |
| 1460 | * hosts. The caller is responsible for ensuring that the RCU read lock is |
| 1461 | * taken before calling this function. |
| 1462 | * |
| 1463 | * Returns the label of the far end or NULL if it's not special. |
| 1464 | */ |
| 1465 | static char *smack_host_label(struct sockaddr_in *sip) |
| 1466 | { |
| 1467 | struct smk_netlbladdr *snp; |
| 1468 | struct in_addr *siap = &sip->sin_addr; |
| 1469 | |
| 1470 | if (siap->s_addr == 0) |
| 1471 | return NULL; |
| 1472 | |
| 1473 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) |
| 1474 | /* |
| 1475 | * we break after finding the first match because |
| 1476 | * the list is sorted from longest to shortest mask |
| 1477 | * so we have found the most specific match |
| 1478 | */ |
| 1479 | if ((&snp->smk_host.sin_addr)->s_addr == |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 1480 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
| 1481 | /* we have found the special CIPSO option */ |
| 1482 | if (snp->smk_label == smack_cipso_option) |
| 1483 | return NULL; |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 1484 | return snp->smk_label; |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 1485 | } |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 1486 | |
| 1487 | return NULL; |
| 1488 | } |
| 1489 | |
| 1490 | /** |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1491 | * smack_set_catset - convert a capset to netlabel mls categories |
| 1492 | * @catset: the Smack categories |
| 1493 | * @sap: where to put the netlabel categories |
| 1494 | * |
| 1495 | * Allocates and fills attr.mls.cat |
| 1496 | */ |
| 1497 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) |
| 1498 | { |
| 1499 | unsigned char *cp; |
| 1500 | unsigned char m; |
| 1501 | int cat; |
| 1502 | int rc; |
| 1503 | int byte; |
| 1504 | |
Harvey Harrison | c60264c | 2008-04-28 02:13:41 -0700 | [diff] [blame] | 1505 | if (!catset) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1506 | return; |
| 1507 | |
| 1508 | sap->flags |= NETLBL_SECATTR_MLS_CAT; |
| 1509 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); |
| 1510 | sap->attr.mls.cat->startbit = 0; |
| 1511 | |
| 1512 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) |
| 1513 | for (m = 0x80; m != 0; m >>= 1, cat++) { |
| 1514 | if ((m & *cp) == 0) |
| 1515 | continue; |
| 1516 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, |
| 1517 | cat, GFP_ATOMIC); |
| 1518 | } |
| 1519 | } |
| 1520 | |
| 1521 | /** |
| 1522 | * smack_to_secattr - fill a secattr from a smack value |
| 1523 | * @smack: the smack value |
| 1524 | * @nlsp: where the result goes |
| 1525 | * |
| 1526 | * Casey says that CIPSO is good enough for now. |
| 1527 | * It can be used to effect. |
| 1528 | * It can also be abused to effect when necessary. |
| 1529 | * Appologies to the TSIG group in general and GW in particular. |
| 1530 | */ |
| 1531 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) |
| 1532 | { |
| 1533 | struct smack_cipso cipso; |
| 1534 | int rc; |
| 1535 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1536 | nlsp->domain = smack; |
| 1537 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1538 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1539 | rc = smack_to_cipso(smack, &cipso); |
| 1540 | if (rc == 0) { |
| 1541 | nlsp->attr.mls.lvl = cipso.smk_level; |
| 1542 | smack_set_catset(cipso.smk_catset, nlsp); |
| 1543 | } else { |
| 1544 | nlsp->attr.mls.lvl = smack_cipso_direct; |
| 1545 | smack_set_catset(smack, nlsp); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1546 | } |
| 1547 | } |
| 1548 | |
| 1549 | /** |
| 1550 | * smack_netlabel - Set the secattr on a socket |
| 1551 | * @sk: the socket |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1552 | * @labeled: socket label scheme |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1553 | * |
| 1554 | * Convert the outbound smack value (smk_out) to a |
| 1555 | * secattr and attach it to the socket. |
| 1556 | * |
| 1557 | * Returns 0 on success or an error code |
| 1558 | */ |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1559 | static int smack_netlabel(struct sock *sk, int labeled) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1560 | { |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 1561 | struct socket_smack *ssp = sk->sk_security; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1562 | struct netlbl_lsm_secattr secattr; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1563 | int rc = 0; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1564 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1565 | /* |
| 1566 | * Usually the netlabel code will handle changing the |
| 1567 | * packet labeling based on the label. |
| 1568 | * The case of a single label host is different, because |
| 1569 | * a single label host should never get a labeled packet |
| 1570 | * even though the label is usually associated with a packet |
| 1571 | * label. |
| 1572 | */ |
| 1573 | local_bh_disable(); |
| 1574 | bh_lock_sock_nested(sk); |
| 1575 | |
| 1576 | if (ssp->smk_out == smack_net_ambient || |
| 1577 | labeled == SMACK_UNLABELED_SOCKET) |
| 1578 | netlbl_sock_delattr(sk); |
| 1579 | else { |
| 1580 | netlbl_secattr_init(&secattr); |
| 1581 | smack_to_secattr(ssp->smk_out, &secattr); |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 1582 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1583 | netlbl_secattr_destroy(&secattr); |
| 1584 | } |
| 1585 | |
| 1586 | bh_unlock_sock(sk); |
| 1587 | local_bh_enable(); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1588 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1589 | return rc; |
| 1590 | } |
| 1591 | |
| 1592 | /** |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 1593 | * smack_netlbel_send - Set the secattr on a socket and perform access checks |
| 1594 | * @sk: the socket |
| 1595 | * @sap: the destination address |
| 1596 | * |
| 1597 | * Set the correct secattr for the given socket based on the destination |
| 1598 | * address and perform any outbound access checks needed. |
| 1599 | * |
| 1600 | * Returns 0 on success or an error code. |
| 1601 | * |
| 1602 | */ |
| 1603 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) |
| 1604 | { |
| 1605 | int rc; |
| 1606 | int sk_lbl; |
| 1607 | char *hostsp; |
| 1608 | struct socket_smack *ssp = sk->sk_security; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1609 | struct smk_audit_info ad; |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 1610 | |
| 1611 | rcu_read_lock(); |
| 1612 | hostsp = smack_host_label(sap); |
| 1613 | if (hostsp != NULL) { |
| 1614 | sk_lbl = SMACK_UNLABELED_SOCKET; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1615 | #ifdef CONFIG_AUDIT |
| 1616 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
| 1617 | ad.a.u.net.family = sap->sin_family; |
| 1618 | ad.a.u.net.dport = sap->sin_port; |
| 1619 | ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; |
| 1620 | #endif |
| 1621 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 1622 | } else { |
| 1623 | sk_lbl = SMACK_CIPSO_SOCKET; |
| 1624 | rc = 0; |
| 1625 | } |
| 1626 | rcu_read_unlock(); |
| 1627 | if (rc != 0) |
| 1628 | return rc; |
| 1629 | |
| 1630 | return smack_netlabel(sk, sk_lbl); |
| 1631 | } |
| 1632 | |
| 1633 | /** |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1634 | * smack_inode_setsecurity - set smack xattrs |
| 1635 | * @inode: the object |
| 1636 | * @name: attribute name |
| 1637 | * @value: attribute value |
| 1638 | * @size: size of the attribute |
| 1639 | * @flags: unused |
| 1640 | * |
| 1641 | * Sets the named attribute in the appropriate blob |
| 1642 | * |
| 1643 | * Returns 0 on success, or an error code |
| 1644 | */ |
| 1645 | static int smack_inode_setsecurity(struct inode *inode, const char *name, |
| 1646 | const void *value, size_t size, int flags) |
| 1647 | { |
| 1648 | char *sp; |
| 1649 | struct inode_smack *nsp = inode->i_security; |
| 1650 | struct socket_smack *ssp; |
| 1651 | struct socket *sock; |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1652 | int rc = 0; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1653 | |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 1654 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1655 | return -EACCES; |
| 1656 | |
| 1657 | sp = smk_import(value, size); |
| 1658 | if (sp == NULL) |
| 1659 | return -EINVAL; |
| 1660 | |
| 1661 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { |
| 1662 | nsp->smk_inode = sp; |
David P. Quigley | ddd29ec | 2009-09-09 14:25:37 -0400 | [diff] [blame] | 1663 | nsp->smk_flags |= SMK_INODE_INSTANT; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1664 | return 0; |
| 1665 | } |
| 1666 | /* |
| 1667 | * The rest of the Smack xattrs are only on sockets. |
| 1668 | */ |
| 1669 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) |
| 1670 | return -EOPNOTSUPP; |
| 1671 | |
| 1672 | sock = SOCKET_I(inode); |
Ahmed S. Darwish | 2e1d146 | 2008-02-13 15:03:34 -0800 | [diff] [blame] | 1673 | if (sock == NULL || sock->sk == NULL) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1674 | return -EOPNOTSUPP; |
| 1675 | |
| 1676 | ssp = sock->sk->sk_security; |
| 1677 | |
| 1678 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
| 1679 | ssp->smk_in = sp; |
| 1680 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
| 1681 | ssp->smk_out = sp; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1682 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1683 | if (rc != 0) |
| 1684 | printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", |
| 1685 | __func__, -rc); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1686 | } else |
| 1687 | return -EOPNOTSUPP; |
| 1688 | |
| 1689 | return 0; |
| 1690 | } |
| 1691 | |
| 1692 | /** |
| 1693 | * smack_socket_post_create - finish socket setup |
| 1694 | * @sock: the socket |
| 1695 | * @family: protocol family |
| 1696 | * @type: unused |
| 1697 | * @protocol: unused |
| 1698 | * @kern: unused |
| 1699 | * |
| 1700 | * Sets the netlabel information on the socket |
| 1701 | * |
| 1702 | * Returns 0 on success, and error code otherwise |
| 1703 | */ |
| 1704 | static int smack_socket_post_create(struct socket *sock, int family, |
| 1705 | int type, int protocol, int kern) |
| 1706 | { |
Ahmed S. Darwish | 2e1d146 | 2008-02-13 15:03:34 -0800 | [diff] [blame] | 1707 | if (family != PF_INET || sock->sk == NULL) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1708 | return 0; |
| 1709 | /* |
| 1710 | * Set the outbound netlbl. |
| 1711 | */ |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1712 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
| 1713 | } |
| 1714 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1715 | /** |
| 1716 | * smack_socket_connect - connect access check |
| 1717 | * @sock: the socket |
| 1718 | * @sap: the other end |
| 1719 | * @addrlen: size of sap |
| 1720 | * |
| 1721 | * Verifies that a connection may be possible |
| 1722 | * |
| 1723 | * Returns 0 on success, and error code otherwise |
| 1724 | */ |
| 1725 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, |
| 1726 | int addrlen) |
| 1727 | { |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1728 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
| 1729 | return 0; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1730 | if (addrlen < sizeof(struct sockaddr_in)) |
| 1731 | return -EINVAL; |
| 1732 | |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 1733 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1734 | } |
| 1735 | |
| 1736 | /** |
| 1737 | * smack_flags_to_may - convert S_ to MAY_ values |
| 1738 | * @flags: the S_ value |
| 1739 | * |
| 1740 | * Returns the equivalent MAY_ value |
| 1741 | */ |
| 1742 | static int smack_flags_to_may(int flags) |
| 1743 | { |
| 1744 | int may = 0; |
| 1745 | |
| 1746 | if (flags & S_IRUGO) |
| 1747 | may |= MAY_READ; |
| 1748 | if (flags & S_IWUGO) |
| 1749 | may |= MAY_WRITE; |
| 1750 | if (flags & S_IXUGO) |
| 1751 | may |= MAY_EXEC; |
| 1752 | |
| 1753 | return may; |
| 1754 | } |
| 1755 | |
| 1756 | /** |
| 1757 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg |
| 1758 | * @msg: the object |
| 1759 | * |
| 1760 | * Returns 0 |
| 1761 | */ |
| 1762 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) |
| 1763 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 1764 | msg->security = current_security(); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1765 | return 0; |
| 1766 | } |
| 1767 | |
| 1768 | /** |
| 1769 | * smack_msg_msg_free_security - Clear the security blob for msg_msg |
| 1770 | * @msg: the object |
| 1771 | * |
| 1772 | * Clears the blob pointer |
| 1773 | */ |
| 1774 | static void smack_msg_msg_free_security(struct msg_msg *msg) |
| 1775 | { |
| 1776 | msg->security = NULL; |
| 1777 | } |
| 1778 | |
| 1779 | /** |
| 1780 | * smack_of_shm - the smack pointer for the shm |
| 1781 | * @shp: the object |
| 1782 | * |
| 1783 | * Returns a pointer to the smack value |
| 1784 | */ |
| 1785 | static char *smack_of_shm(struct shmid_kernel *shp) |
| 1786 | { |
| 1787 | return (char *)shp->shm_perm.security; |
| 1788 | } |
| 1789 | |
| 1790 | /** |
| 1791 | * smack_shm_alloc_security - Set the security blob for shm |
| 1792 | * @shp: the object |
| 1793 | * |
| 1794 | * Returns 0 |
| 1795 | */ |
| 1796 | static int smack_shm_alloc_security(struct shmid_kernel *shp) |
| 1797 | { |
| 1798 | struct kern_ipc_perm *isp = &shp->shm_perm; |
| 1799 | |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 1800 | isp->security = current_security(); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1801 | return 0; |
| 1802 | } |
| 1803 | |
| 1804 | /** |
| 1805 | * smack_shm_free_security - Clear the security blob for shm |
| 1806 | * @shp: the object |
| 1807 | * |
| 1808 | * Clears the blob pointer |
| 1809 | */ |
| 1810 | static void smack_shm_free_security(struct shmid_kernel *shp) |
| 1811 | { |
| 1812 | struct kern_ipc_perm *isp = &shp->shm_perm; |
| 1813 | |
| 1814 | isp->security = NULL; |
| 1815 | } |
| 1816 | |
| 1817 | /** |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1818 | * smk_curacc_shm : check if current has access on shm |
| 1819 | * @shp : the object |
| 1820 | * @access : access requested |
| 1821 | * |
| 1822 | * Returns 0 if current has the requested access, error code otherwise |
| 1823 | */ |
| 1824 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) |
| 1825 | { |
| 1826 | char *ssp = smack_of_shm(shp); |
| 1827 | struct smk_audit_info ad; |
| 1828 | |
| 1829 | #ifdef CONFIG_AUDIT |
| 1830 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); |
| 1831 | ad.a.u.ipc_id = shp->shm_perm.id; |
| 1832 | #endif |
| 1833 | return smk_curacc(ssp, access, &ad); |
| 1834 | } |
| 1835 | |
| 1836 | /** |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1837 | * smack_shm_associate - Smack access check for shm |
| 1838 | * @shp: the object |
| 1839 | * @shmflg: access requested |
| 1840 | * |
| 1841 | * Returns 0 if current has the requested access, error code otherwise |
| 1842 | */ |
| 1843 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) |
| 1844 | { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1845 | int may; |
| 1846 | |
| 1847 | may = smack_flags_to_may(shmflg); |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1848 | return smk_curacc_shm(shp, may); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1849 | } |
| 1850 | |
| 1851 | /** |
| 1852 | * smack_shm_shmctl - Smack access check for shm |
| 1853 | * @shp: the object |
| 1854 | * @cmd: what it wants to do |
| 1855 | * |
| 1856 | * Returns 0 if current has the requested access, error code otherwise |
| 1857 | */ |
| 1858 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) |
| 1859 | { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1860 | int may; |
| 1861 | |
| 1862 | switch (cmd) { |
| 1863 | case IPC_STAT: |
| 1864 | case SHM_STAT: |
| 1865 | may = MAY_READ; |
| 1866 | break; |
| 1867 | case IPC_SET: |
| 1868 | case SHM_LOCK: |
| 1869 | case SHM_UNLOCK: |
| 1870 | case IPC_RMID: |
| 1871 | may = MAY_READWRITE; |
| 1872 | break; |
| 1873 | case IPC_INFO: |
| 1874 | case SHM_INFO: |
| 1875 | /* |
| 1876 | * System level information. |
| 1877 | */ |
| 1878 | return 0; |
| 1879 | default: |
| 1880 | return -EINVAL; |
| 1881 | } |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1882 | return smk_curacc_shm(shp, may); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1883 | } |
| 1884 | |
| 1885 | /** |
| 1886 | * smack_shm_shmat - Smack access for shmat |
| 1887 | * @shp: the object |
| 1888 | * @shmaddr: unused |
| 1889 | * @shmflg: access requested |
| 1890 | * |
| 1891 | * Returns 0 if current has the requested access, error code otherwise |
| 1892 | */ |
| 1893 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, |
| 1894 | int shmflg) |
| 1895 | { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1896 | int may; |
| 1897 | |
| 1898 | may = smack_flags_to_may(shmflg); |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1899 | return smk_curacc_shm(shp, may); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1900 | } |
| 1901 | |
| 1902 | /** |
| 1903 | * smack_of_sem - the smack pointer for the sem |
| 1904 | * @sma: the object |
| 1905 | * |
| 1906 | * Returns a pointer to the smack value |
| 1907 | */ |
| 1908 | static char *smack_of_sem(struct sem_array *sma) |
| 1909 | { |
| 1910 | return (char *)sma->sem_perm.security; |
| 1911 | } |
| 1912 | |
| 1913 | /** |
| 1914 | * smack_sem_alloc_security - Set the security blob for sem |
| 1915 | * @sma: the object |
| 1916 | * |
| 1917 | * Returns 0 |
| 1918 | */ |
| 1919 | static int smack_sem_alloc_security(struct sem_array *sma) |
| 1920 | { |
| 1921 | struct kern_ipc_perm *isp = &sma->sem_perm; |
| 1922 | |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 1923 | isp->security = current_security(); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1924 | return 0; |
| 1925 | } |
| 1926 | |
| 1927 | /** |
| 1928 | * smack_sem_free_security - Clear the security blob for sem |
| 1929 | * @sma: the object |
| 1930 | * |
| 1931 | * Clears the blob pointer |
| 1932 | */ |
| 1933 | static void smack_sem_free_security(struct sem_array *sma) |
| 1934 | { |
| 1935 | struct kern_ipc_perm *isp = &sma->sem_perm; |
| 1936 | |
| 1937 | isp->security = NULL; |
| 1938 | } |
| 1939 | |
| 1940 | /** |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1941 | * smk_curacc_sem : check if current has access on sem |
| 1942 | * @sma : the object |
| 1943 | * @access : access requested |
| 1944 | * |
| 1945 | * Returns 0 if current has the requested access, error code otherwise |
| 1946 | */ |
| 1947 | static int smk_curacc_sem(struct sem_array *sma, int access) |
| 1948 | { |
| 1949 | char *ssp = smack_of_sem(sma); |
| 1950 | struct smk_audit_info ad; |
| 1951 | |
| 1952 | #ifdef CONFIG_AUDIT |
| 1953 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); |
| 1954 | ad.a.u.ipc_id = sma->sem_perm.id; |
| 1955 | #endif |
| 1956 | return smk_curacc(ssp, access, &ad); |
| 1957 | } |
| 1958 | |
| 1959 | /** |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1960 | * smack_sem_associate - Smack access check for sem |
| 1961 | * @sma: the object |
| 1962 | * @semflg: access requested |
| 1963 | * |
| 1964 | * Returns 0 if current has the requested access, error code otherwise |
| 1965 | */ |
| 1966 | static int smack_sem_associate(struct sem_array *sma, int semflg) |
| 1967 | { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1968 | int may; |
| 1969 | |
| 1970 | may = smack_flags_to_may(semflg); |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1971 | return smk_curacc_sem(sma, may); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1972 | } |
| 1973 | |
| 1974 | /** |
| 1975 | * smack_sem_shmctl - Smack access check for sem |
| 1976 | * @sma: the object |
| 1977 | * @cmd: what it wants to do |
| 1978 | * |
| 1979 | * Returns 0 if current has the requested access, error code otherwise |
| 1980 | */ |
| 1981 | static int smack_sem_semctl(struct sem_array *sma, int cmd) |
| 1982 | { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1983 | int may; |
| 1984 | |
| 1985 | switch (cmd) { |
| 1986 | case GETPID: |
| 1987 | case GETNCNT: |
| 1988 | case GETZCNT: |
| 1989 | case GETVAL: |
| 1990 | case GETALL: |
| 1991 | case IPC_STAT: |
| 1992 | case SEM_STAT: |
| 1993 | may = MAY_READ; |
| 1994 | break; |
| 1995 | case SETVAL: |
| 1996 | case SETALL: |
| 1997 | case IPC_RMID: |
| 1998 | case IPC_SET: |
| 1999 | may = MAY_READWRITE; |
| 2000 | break; |
| 2001 | case IPC_INFO: |
| 2002 | case SEM_INFO: |
| 2003 | /* |
| 2004 | * System level information |
| 2005 | */ |
| 2006 | return 0; |
| 2007 | default: |
| 2008 | return -EINVAL; |
| 2009 | } |
| 2010 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2011 | return smk_curacc_sem(sma, may); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2012 | } |
| 2013 | |
| 2014 | /** |
| 2015 | * smack_sem_semop - Smack checks of semaphore operations |
| 2016 | * @sma: the object |
| 2017 | * @sops: unused |
| 2018 | * @nsops: unused |
| 2019 | * @alter: unused |
| 2020 | * |
| 2021 | * Treated as read and write in all cases. |
| 2022 | * |
| 2023 | * Returns 0 if access is allowed, error code otherwise |
| 2024 | */ |
| 2025 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, |
| 2026 | unsigned nsops, int alter) |
| 2027 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2028 | return smk_curacc_sem(sma, MAY_READWRITE); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2029 | } |
| 2030 | |
| 2031 | /** |
| 2032 | * smack_msg_alloc_security - Set the security blob for msg |
| 2033 | * @msq: the object |
| 2034 | * |
| 2035 | * Returns 0 |
| 2036 | */ |
| 2037 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) |
| 2038 | { |
| 2039 | struct kern_ipc_perm *kisp = &msq->q_perm; |
| 2040 | |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 2041 | kisp->security = current_security(); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2042 | return 0; |
| 2043 | } |
| 2044 | |
| 2045 | /** |
| 2046 | * smack_msg_free_security - Clear the security blob for msg |
| 2047 | * @msq: the object |
| 2048 | * |
| 2049 | * Clears the blob pointer |
| 2050 | */ |
| 2051 | static void smack_msg_queue_free_security(struct msg_queue *msq) |
| 2052 | { |
| 2053 | struct kern_ipc_perm *kisp = &msq->q_perm; |
| 2054 | |
| 2055 | kisp->security = NULL; |
| 2056 | } |
| 2057 | |
| 2058 | /** |
| 2059 | * smack_of_msq - the smack pointer for the msq |
| 2060 | * @msq: the object |
| 2061 | * |
| 2062 | * Returns a pointer to the smack value |
| 2063 | */ |
| 2064 | static char *smack_of_msq(struct msg_queue *msq) |
| 2065 | { |
| 2066 | return (char *)msq->q_perm.security; |
| 2067 | } |
| 2068 | |
| 2069 | /** |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2070 | * smk_curacc_msq : helper to check if current has access on msq |
| 2071 | * @msq : the msq |
| 2072 | * @access : access requested |
| 2073 | * |
| 2074 | * return 0 if current has access, error otherwise |
| 2075 | */ |
| 2076 | static int smk_curacc_msq(struct msg_queue *msq, int access) |
| 2077 | { |
| 2078 | char *msp = smack_of_msq(msq); |
| 2079 | struct smk_audit_info ad; |
| 2080 | |
| 2081 | #ifdef CONFIG_AUDIT |
| 2082 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); |
| 2083 | ad.a.u.ipc_id = msq->q_perm.id; |
| 2084 | #endif |
| 2085 | return smk_curacc(msp, access, &ad); |
| 2086 | } |
| 2087 | |
| 2088 | /** |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2089 | * smack_msg_queue_associate - Smack access check for msg_queue |
| 2090 | * @msq: the object |
| 2091 | * @msqflg: access requested |
| 2092 | * |
| 2093 | * Returns 0 if current has the requested access, error code otherwise |
| 2094 | */ |
| 2095 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) |
| 2096 | { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2097 | int may; |
| 2098 | |
| 2099 | may = smack_flags_to_may(msqflg); |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2100 | return smk_curacc_msq(msq, may); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2101 | } |
| 2102 | |
| 2103 | /** |
| 2104 | * smack_msg_queue_msgctl - Smack access check for msg_queue |
| 2105 | * @msq: the object |
| 2106 | * @cmd: what it wants to do |
| 2107 | * |
| 2108 | * Returns 0 if current has the requested access, error code otherwise |
| 2109 | */ |
| 2110 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) |
| 2111 | { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2112 | int may; |
| 2113 | |
| 2114 | switch (cmd) { |
| 2115 | case IPC_STAT: |
| 2116 | case MSG_STAT: |
| 2117 | may = MAY_READ; |
| 2118 | break; |
| 2119 | case IPC_SET: |
| 2120 | case IPC_RMID: |
| 2121 | may = MAY_READWRITE; |
| 2122 | break; |
| 2123 | case IPC_INFO: |
| 2124 | case MSG_INFO: |
| 2125 | /* |
| 2126 | * System level information |
| 2127 | */ |
| 2128 | return 0; |
| 2129 | default: |
| 2130 | return -EINVAL; |
| 2131 | } |
| 2132 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2133 | return smk_curacc_msq(msq, may); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2134 | } |
| 2135 | |
| 2136 | /** |
| 2137 | * smack_msg_queue_msgsnd - Smack access check for msg_queue |
| 2138 | * @msq: the object |
| 2139 | * @msg: unused |
| 2140 | * @msqflg: access requested |
| 2141 | * |
| 2142 | * Returns 0 if current has the requested access, error code otherwise |
| 2143 | */ |
| 2144 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, |
| 2145 | int msqflg) |
| 2146 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2147 | int may; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2148 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2149 | may = smack_flags_to_may(msqflg); |
| 2150 | return smk_curacc_msq(msq, may); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2151 | } |
| 2152 | |
| 2153 | /** |
| 2154 | * smack_msg_queue_msgsnd - Smack access check for msg_queue |
| 2155 | * @msq: the object |
| 2156 | * @msg: unused |
| 2157 | * @target: unused |
| 2158 | * @type: unused |
| 2159 | * @mode: unused |
| 2160 | * |
| 2161 | * Returns 0 if current has read and write access, error code otherwise |
| 2162 | */ |
| 2163 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, |
| 2164 | struct task_struct *target, long type, int mode) |
| 2165 | { |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2166 | return smk_curacc_msq(msq, MAY_READWRITE); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2167 | } |
| 2168 | |
| 2169 | /** |
| 2170 | * smack_ipc_permission - Smack access for ipc_permission() |
| 2171 | * @ipp: the object permissions |
| 2172 | * @flag: access requested |
| 2173 | * |
| 2174 | * Returns 0 if current has read and write access, error code otherwise |
| 2175 | */ |
| 2176 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) |
| 2177 | { |
| 2178 | char *isp = ipp->security; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2179 | int may = smack_flags_to_may(flag); |
| 2180 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2181 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2182 | #ifdef CONFIG_AUDIT |
| 2183 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); |
| 2184 | ad.a.u.ipc_id = ipp->id; |
| 2185 | #endif |
| 2186 | return smk_curacc(isp, may, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2187 | } |
| 2188 | |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 2189 | /** |
| 2190 | * smack_ipc_getsecid - Extract smack security id |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 2191 | * @ipp: the object permissions |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 2192 | * @secid: where result will be saved |
| 2193 | */ |
| 2194 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) |
| 2195 | { |
| 2196 | char *smack = ipp->security; |
| 2197 | |
| 2198 | *secid = smack_to_secid(smack); |
| 2199 | } |
| 2200 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2201 | /** |
| 2202 | * smack_d_instantiate - Make sure the blob is correct on an inode |
| 2203 | * @opt_dentry: unused |
| 2204 | * @inode: the object |
| 2205 | * |
| 2206 | * Set the inode's security blob if it hasn't been done already. |
| 2207 | */ |
| 2208 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) |
| 2209 | { |
| 2210 | struct super_block *sbp; |
| 2211 | struct superblock_smack *sbsp; |
| 2212 | struct inode_smack *isp; |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 2213 | char *csp = current_security(); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2214 | char *fetched; |
| 2215 | char *final; |
| 2216 | struct dentry *dp; |
| 2217 | |
| 2218 | if (inode == NULL) |
| 2219 | return; |
| 2220 | |
| 2221 | isp = inode->i_security; |
| 2222 | |
| 2223 | mutex_lock(&isp->smk_lock); |
| 2224 | /* |
| 2225 | * If the inode is already instantiated |
| 2226 | * take the quick way out |
| 2227 | */ |
| 2228 | if (isp->smk_flags & SMK_INODE_INSTANT) |
| 2229 | goto unlockandout; |
| 2230 | |
| 2231 | sbp = inode->i_sb; |
| 2232 | sbsp = sbp->s_security; |
| 2233 | /* |
| 2234 | * We're going to use the superblock default label |
| 2235 | * if there's no label on the file. |
| 2236 | */ |
| 2237 | final = sbsp->smk_default; |
| 2238 | |
| 2239 | /* |
Casey Schaufler | e97dcb0 | 2008-06-02 10:04:32 -0700 | [diff] [blame] | 2240 | * If this is the root inode the superblock |
| 2241 | * may be in the process of initialization. |
| 2242 | * If that is the case use the root value out |
| 2243 | * of the superblock. |
| 2244 | */ |
| 2245 | if (opt_dentry->d_parent == opt_dentry) { |
| 2246 | isp->smk_inode = sbsp->smk_root; |
| 2247 | isp->smk_flags |= SMK_INODE_INSTANT; |
| 2248 | goto unlockandout; |
| 2249 | } |
| 2250 | |
| 2251 | /* |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2252 | * This is pretty hackish. |
| 2253 | * Casey says that we shouldn't have to do |
| 2254 | * file system specific code, but it does help |
| 2255 | * with keeping it simple. |
| 2256 | */ |
| 2257 | switch (sbp->s_magic) { |
| 2258 | case SMACK_MAGIC: |
| 2259 | /* |
| 2260 | * Casey says that it's a little embarassing |
| 2261 | * that the smack file system doesn't do |
| 2262 | * extended attributes. |
| 2263 | */ |
| 2264 | final = smack_known_star.smk_known; |
| 2265 | break; |
| 2266 | case PIPEFS_MAGIC: |
| 2267 | /* |
| 2268 | * Casey says pipes are easy (?) |
| 2269 | */ |
| 2270 | final = smack_known_star.smk_known; |
| 2271 | break; |
| 2272 | case DEVPTS_SUPER_MAGIC: |
| 2273 | /* |
| 2274 | * devpts seems content with the label of the task. |
| 2275 | * Programs that change smack have to treat the |
| 2276 | * pty with respect. |
| 2277 | */ |
| 2278 | final = csp; |
| 2279 | break; |
| 2280 | case SOCKFS_MAGIC: |
| 2281 | /* |
| 2282 | * Casey says sockets get the smack of the task. |
| 2283 | */ |
| 2284 | final = csp; |
| 2285 | break; |
| 2286 | case PROC_SUPER_MAGIC: |
| 2287 | /* |
| 2288 | * Casey says procfs appears not to care. |
| 2289 | * The superblock default suffices. |
| 2290 | */ |
| 2291 | break; |
| 2292 | case TMPFS_MAGIC: |
| 2293 | /* |
| 2294 | * Device labels should come from the filesystem, |
| 2295 | * but watch out, because they're volitile, |
| 2296 | * getting recreated on every reboot. |
| 2297 | */ |
| 2298 | final = smack_known_star.smk_known; |
| 2299 | /* |
| 2300 | * No break. |
| 2301 | * |
| 2302 | * If a smack value has been set we want to use it, |
| 2303 | * but since tmpfs isn't giving us the opportunity |
| 2304 | * to set mount options simulate setting the |
| 2305 | * superblock default. |
| 2306 | */ |
| 2307 | default: |
| 2308 | /* |
| 2309 | * This isn't an understood special case. |
| 2310 | * Get the value from the xattr. |
| 2311 | * |
| 2312 | * No xattr support means, alas, no SMACK label. |
| 2313 | * Use the aforeapplied default. |
| 2314 | * It would be curious if the label of the task |
| 2315 | * does not match that assigned. |
| 2316 | */ |
| 2317 | if (inode->i_op->getxattr == NULL) |
| 2318 | break; |
| 2319 | /* |
| 2320 | * Get the dentry for xattr. |
| 2321 | */ |
| 2322 | if (opt_dentry == NULL) { |
| 2323 | dp = d_find_alias(inode); |
| 2324 | if (dp == NULL) |
| 2325 | break; |
| 2326 | } else { |
| 2327 | dp = dget(opt_dentry); |
| 2328 | if (dp == NULL) |
| 2329 | break; |
| 2330 | } |
| 2331 | |
| 2332 | fetched = smk_fetch(inode, dp); |
| 2333 | if (fetched != NULL) |
| 2334 | final = fetched; |
| 2335 | |
| 2336 | dput(dp); |
| 2337 | break; |
| 2338 | } |
| 2339 | |
| 2340 | if (final == NULL) |
| 2341 | isp->smk_inode = csp; |
| 2342 | else |
| 2343 | isp->smk_inode = final; |
| 2344 | |
| 2345 | isp->smk_flags |= SMK_INODE_INSTANT; |
| 2346 | |
| 2347 | unlockandout: |
| 2348 | mutex_unlock(&isp->smk_lock); |
| 2349 | return; |
| 2350 | } |
| 2351 | |
| 2352 | /** |
| 2353 | * smack_getprocattr - Smack process attribute access |
| 2354 | * @p: the object task |
| 2355 | * @name: the name of the attribute in /proc/.../attr |
| 2356 | * @value: where to put the result |
| 2357 | * |
| 2358 | * Places a copy of the task Smack into value |
| 2359 | * |
| 2360 | * Returns the length of the smack label or an error code |
| 2361 | */ |
| 2362 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) |
| 2363 | { |
| 2364 | char *cp; |
| 2365 | int slen; |
| 2366 | |
| 2367 | if (strcmp(name, "current") != 0) |
| 2368 | return -EINVAL; |
| 2369 | |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2370 | cp = kstrdup(task_security(p), GFP_KERNEL); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2371 | if (cp == NULL) |
| 2372 | return -ENOMEM; |
| 2373 | |
| 2374 | slen = strlen(cp); |
| 2375 | *value = cp; |
| 2376 | return slen; |
| 2377 | } |
| 2378 | |
| 2379 | /** |
| 2380 | * smack_setprocattr - Smack process attribute setting |
| 2381 | * @p: the object task |
| 2382 | * @name: the name of the attribute in /proc/.../attr |
| 2383 | * @value: the value to set |
| 2384 | * @size: the size of the value |
| 2385 | * |
| 2386 | * Sets the Smack value of the task. Only setting self |
| 2387 | * is permitted and only with privilege |
| 2388 | * |
| 2389 | * Returns the length of the smack label or an error code |
| 2390 | */ |
| 2391 | static int smack_setprocattr(struct task_struct *p, char *name, |
| 2392 | void *value, size_t size) |
| 2393 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2394 | struct cred *new; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2395 | char *newsmack; |
| 2396 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2397 | /* |
| 2398 | * Changing another process' Smack value is too dangerous |
| 2399 | * and supports no sane use case. |
| 2400 | */ |
| 2401 | if (p != current) |
| 2402 | return -EPERM; |
| 2403 | |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 2404 | if (!capable(CAP_MAC_ADMIN)) |
| 2405 | return -EPERM; |
| 2406 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2407 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
| 2408 | return -EINVAL; |
| 2409 | |
| 2410 | if (strcmp(name, "current") != 0) |
| 2411 | return -EINVAL; |
| 2412 | |
| 2413 | newsmack = smk_import(value, size); |
| 2414 | if (newsmack == NULL) |
| 2415 | return -EINVAL; |
| 2416 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2417 | /* |
| 2418 | * No process is ever allowed the web ("@") label. |
| 2419 | */ |
| 2420 | if (newsmack == smack_known_web.smk_known) |
| 2421 | return -EPERM; |
| 2422 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2423 | new = prepare_creds(); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2424 | if (new == NULL) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2425 | return -ENOMEM; |
| 2426 | new->security = newsmack; |
| 2427 | commit_creds(new); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2428 | return size; |
| 2429 | } |
| 2430 | |
| 2431 | /** |
| 2432 | * smack_unix_stream_connect - Smack access on UDS |
| 2433 | * @sock: one socket |
| 2434 | * @other: the other socket |
| 2435 | * @newsk: unused |
| 2436 | * |
| 2437 | * Return 0 if a subject with the smack of sock could access |
| 2438 | * an object with the smack of other, otherwise an error code |
| 2439 | */ |
| 2440 | static int smack_unix_stream_connect(struct socket *sock, |
| 2441 | struct socket *other, struct sock *newsk) |
| 2442 | { |
| 2443 | struct inode *sp = SOCK_INODE(sock); |
| 2444 | struct inode *op = SOCK_INODE(other); |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2445 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2446 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2447 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
| 2448 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
| 2449 | return smk_access(smk_of_inode(sp), smk_of_inode(op), |
| 2450 | MAY_READWRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2451 | } |
| 2452 | |
| 2453 | /** |
| 2454 | * smack_unix_may_send - Smack access on UDS |
| 2455 | * @sock: one socket |
| 2456 | * @other: the other socket |
| 2457 | * |
| 2458 | * Return 0 if a subject with the smack of sock could access |
| 2459 | * an object with the smack of other, otherwise an error code |
| 2460 | */ |
| 2461 | static int smack_unix_may_send(struct socket *sock, struct socket *other) |
| 2462 | { |
| 2463 | struct inode *sp = SOCK_INODE(sock); |
| 2464 | struct inode *op = SOCK_INODE(other); |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2465 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2466 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2467 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
| 2468 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
| 2469 | return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2470 | } |
| 2471 | |
| 2472 | /** |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2473 | * smack_socket_sendmsg - Smack check based on destination host |
| 2474 | * @sock: the socket |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 2475 | * @msg: the message |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2476 | * @size: the size of the message |
| 2477 | * |
| 2478 | * Return 0 if the current subject can write to the destination |
| 2479 | * host. This is only a question if the destination is a single |
| 2480 | * label host. |
| 2481 | */ |
| 2482 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, |
| 2483 | int size) |
| 2484 | { |
| 2485 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2486 | |
| 2487 | /* |
| 2488 | * Perfectly reasonable for this to be NULL |
| 2489 | */ |
Julia Lawall | da34d42 | 2009-08-05 14:34:55 +0200 | [diff] [blame] | 2490 | if (sip == NULL || sip->sin_family != AF_INET) |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2491 | return 0; |
| 2492 | |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2493 | return smack_netlabel_send(sock->sk, sip); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2494 | } |
| 2495 | |
| 2496 | |
| 2497 | /** |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 2498 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2499 | * @sap: netlabel secattr |
| 2500 | * @sip: where to put the result |
| 2501 | * |
| 2502 | * Copies a smack label into sip |
| 2503 | */ |
| 2504 | static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip) |
| 2505 | { |
| 2506 | char smack[SMK_LABELLEN]; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2507 | char *sp; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2508 | int pcat; |
| 2509 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2510 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2511 | /* |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2512 | * Looks like a CIPSO packet. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2513 | * If there are flags but no level netlabel isn't |
| 2514 | * behaving the way we expect it to. |
| 2515 | * |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2516 | * Get the categories, if any |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2517 | * Without guidance regarding the smack value |
| 2518 | * for the packet fall back on the network |
| 2519 | * ambient value. |
| 2520 | */ |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2521 | memset(smack, '\0', SMK_LABELLEN); |
| 2522 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) |
| 2523 | for (pcat = -1;;) { |
| 2524 | pcat = netlbl_secattr_catmap_walk( |
| 2525 | sap->attr.mls.cat, pcat + 1); |
| 2526 | if (pcat < 0) |
| 2527 | break; |
| 2528 | smack_catset_bit(pcat, smack); |
| 2529 | } |
| 2530 | /* |
| 2531 | * If it is CIPSO using smack direct mapping |
| 2532 | * we are already done. WeeHee. |
| 2533 | */ |
| 2534 | if (sap->attr.mls.lvl == smack_cipso_direct) { |
| 2535 | memcpy(sip, smack, SMK_MAXLEN); |
| 2536 | return; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2537 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2538 | /* |
| 2539 | * Look it up in the supplied table if it is not |
| 2540 | * a direct mapping. |
| 2541 | */ |
| 2542 | smack_from_cipso(sap->attr.mls.lvl, smack, sip); |
| 2543 | return; |
| 2544 | } |
| 2545 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
| 2546 | /* |
| 2547 | * Looks like a fallback, which gives us a secid. |
| 2548 | */ |
| 2549 | sp = smack_from_secid(sap->attr.secid); |
| 2550 | /* |
| 2551 | * This has got to be a bug because it is |
| 2552 | * impossible to specify a fallback without |
| 2553 | * specifying the label, which will ensure |
| 2554 | * it has a secid, and the only way to get a |
| 2555 | * secid is from a fallback. |
| 2556 | */ |
| 2557 | BUG_ON(sp == NULL); |
| 2558 | strncpy(sip, sp, SMK_MAXLEN); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2559 | return; |
| 2560 | } |
| 2561 | /* |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2562 | * Without guidance regarding the smack value |
| 2563 | * for the packet fall back on the network |
| 2564 | * ambient value. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2565 | */ |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2566 | strncpy(sip, smack_net_ambient, SMK_MAXLEN); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2567 | return; |
| 2568 | } |
| 2569 | |
| 2570 | /** |
| 2571 | * smack_socket_sock_rcv_skb - Smack packet delivery access check |
| 2572 | * @sk: socket |
| 2573 | * @skb: packet |
| 2574 | * |
| 2575 | * Returns 0 if the packet should be delivered, an error code otherwise |
| 2576 | */ |
| 2577 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 2578 | { |
| 2579 | struct netlbl_lsm_secattr secattr; |
| 2580 | struct socket_smack *ssp = sk->sk_security; |
| 2581 | char smack[SMK_LABELLEN]; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2582 | char *csp; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2583 | int rc; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2584 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2585 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
| 2586 | return 0; |
| 2587 | |
| 2588 | /* |
| 2589 | * Translate what netlabel gave us. |
| 2590 | */ |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2591 | netlbl_secattr_init(&secattr); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2592 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2593 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2594 | if (rc == 0) { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2595 | smack_from_secattr(&secattr, smack); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2596 | csp = smack; |
| 2597 | } else |
| 2598 | csp = smack_net_ambient; |
| 2599 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2600 | netlbl_secattr_destroy(&secattr); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 2601 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2602 | #ifdef CONFIG_AUDIT |
| 2603 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
| 2604 | ad.a.u.net.family = sk->sk_family; |
Eric Dumazet | 8964be4 | 2009-11-20 15:35:04 -0800 | [diff] [blame] | 2605 | ad.a.u.net.netif = skb->skb_iif; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2606 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
| 2607 | #endif |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2608 | /* |
| 2609 | * Receiving a packet requires that the other end |
| 2610 | * be able to write here. Read access is not required. |
| 2611 | * This is the simplist possible security model |
| 2612 | * for networking. |
| 2613 | */ |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2614 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
Paul Moore | a813429 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 2615 | if (rc != 0) |
| 2616 | netlbl_skbuff_err(skb, rc, 0); |
| 2617 | return rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2618 | } |
| 2619 | |
| 2620 | /** |
| 2621 | * smack_socket_getpeersec_stream - pull in packet label |
| 2622 | * @sock: the socket |
| 2623 | * @optval: user's destination |
| 2624 | * @optlen: size thereof |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 2625 | * @len: max thereof |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2626 | * |
| 2627 | * returns zero on success, an error code otherwise |
| 2628 | */ |
| 2629 | static int smack_socket_getpeersec_stream(struct socket *sock, |
| 2630 | char __user *optval, |
| 2631 | int __user *optlen, unsigned len) |
| 2632 | { |
| 2633 | struct socket_smack *ssp; |
| 2634 | int slen; |
| 2635 | int rc = 0; |
| 2636 | |
| 2637 | ssp = sock->sk->sk_security; |
| 2638 | slen = strlen(ssp->smk_packet) + 1; |
| 2639 | |
| 2640 | if (slen > len) |
| 2641 | rc = -ERANGE; |
| 2642 | else if (copy_to_user(optval, ssp->smk_packet, slen) != 0) |
| 2643 | rc = -EFAULT; |
| 2644 | |
| 2645 | if (put_user(slen, optlen) != 0) |
| 2646 | rc = -EFAULT; |
| 2647 | |
| 2648 | return rc; |
| 2649 | } |
| 2650 | |
| 2651 | |
| 2652 | /** |
| 2653 | * smack_socket_getpeersec_dgram - pull in packet label |
| 2654 | * @sock: the socket |
| 2655 | * @skb: packet data |
| 2656 | * @secid: pointer to where to put the secid of the packet |
| 2657 | * |
| 2658 | * Sets the netlabel socket state on sk from parent |
| 2659 | */ |
| 2660 | static int smack_socket_getpeersec_dgram(struct socket *sock, |
| 2661 | struct sk_buff *skb, u32 *secid) |
| 2662 | |
| 2663 | { |
| 2664 | struct netlbl_lsm_secattr secattr; |
| 2665 | struct sock *sk; |
| 2666 | char smack[SMK_LABELLEN]; |
| 2667 | int family = PF_INET; |
| 2668 | u32 s; |
| 2669 | int rc; |
| 2670 | |
| 2671 | /* |
| 2672 | * Only works for families with packets. |
| 2673 | */ |
| 2674 | if (sock != NULL) { |
| 2675 | sk = sock->sk; |
| 2676 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
| 2677 | return 0; |
| 2678 | family = sk->sk_family; |
| 2679 | } |
| 2680 | /* |
| 2681 | * Translate what netlabel gave us. |
| 2682 | */ |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2683 | netlbl_secattr_init(&secattr); |
| 2684 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
| 2685 | if (rc == 0) |
| 2686 | smack_from_secattr(&secattr, smack); |
| 2687 | netlbl_secattr_destroy(&secattr); |
| 2688 | |
| 2689 | /* |
| 2690 | * Give up if we couldn't get anything |
| 2691 | */ |
| 2692 | if (rc != 0) |
| 2693 | return rc; |
| 2694 | |
| 2695 | s = smack_to_secid(smack); |
| 2696 | if (s == 0) |
| 2697 | return -EINVAL; |
| 2698 | |
| 2699 | *secid = s; |
| 2700 | return 0; |
| 2701 | } |
| 2702 | |
| 2703 | /** |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2704 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
| 2705 | * @sk: child sock |
| 2706 | * @parent: parent socket |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2707 | * |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2708 | * Set the smk_{in,out} state of an existing sock based on the process that |
| 2709 | * is creating the new socket. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2710 | */ |
| 2711 | static void smack_sock_graft(struct sock *sk, struct socket *parent) |
| 2712 | { |
| 2713 | struct socket_smack *ssp; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2714 | |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2715 | if (sk == NULL || |
| 2716 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2717 | return; |
| 2718 | |
| 2719 | ssp = sk->sk_security; |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 2720 | ssp->smk_in = ssp->smk_out = current_security(); |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2721 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2722 | } |
| 2723 | |
| 2724 | /** |
| 2725 | * smack_inet_conn_request - Smack access check on connect |
| 2726 | * @sk: socket involved |
| 2727 | * @skb: packet |
| 2728 | * @req: unused |
| 2729 | * |
| 2730 | * Returns 0 if a task with the packet label could write to |
| 2731 | * the socket, otherwise an error code |
| 2732 | */ |
| 2733 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
| 2734 | struct request_sock *req) |
| 2735 | { |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2736 | u16 family = sk->sk_family; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2737 | struct socket_smack *ssp = sk->sk_security; |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2738 | struct netlbl_lsm_secattr secattr; |
| 2739 | struct sockaddr_in addr; |
| 2740 | struct iphdr *hdr; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2741 | char smack[SMK_LABELLEN]; |
| 2742 | int rc; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2743 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2744 | |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2745 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
| 2746 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
| 2747 | family = PF_INET; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2748 | |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2749 | netlbl_secattr_init(&secattr); |
| 2750 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2751 | if (rc == 0) |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2752 | smack_from_secattr(&secattr, smack); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2753 | else |
| 2754 | strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN); |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2755 | netlbl_secattr_destroy(&secattr); |
| 2756 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2757 | #ifdef CONFIG_AUDIT |
| 2758 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
| 2759 | ad.a.u.net.family = family; |
Eric Dumazet | 8964be4 | 2009-11-20 15:35:04 -0800 | [diff] [blame] | 2760 | ad.a.u.net.netif = skb->skb_iif; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2761 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
| 2762 | #endif |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2763 | /* |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2764 | * Receiving a packet requires that the other end be able to write |
| 2765 | * here. Read access is not required. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2766 | */ |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2767 | rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad); |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2768 | if (rc != 0) |
| 2769 | return rc; |
| 2770 | |
| 2771 | /* |
| 2772 | * Save the peer's label in the request_sock so we can later setup |
| 2773 | * smk_packet in the child socket so that SO_PEERCRED can report it. |
| 2774 | */ |
| 2775 | req->peer_secid = smack_to_secid(smack); |
| 2776 | |
| 2777 | /* |
| 2778 | * We need to decide if we want to label the incoming connection here |
| 2779 | * if we do we only need to label the request_sock and the stack will |
| 2780 | * propogate the wire-label to the sock when it is created. |
| 2781 | */ |
| 2782 | hdr = ip_hdr(skb); |
| 2783 | addr.sin_addr.s_addr = hdr->saddr; |
| 2784 | rcu_read_lock(); |
| 2785 | if (smack_host_label(&addr) == NULL) { |
| 2786 | rcu_read_unlock(); |
| 2787 | netlbl_secattr_init(&secattr); |
| 2788 | smack_to_secattr(smack, &secattr); |
| 2789 | rc = netlbl_req_setattr(req, &secattr); |
| 2790 | netlbl_secattr_destroy(&secattr); |
| 2791 | } else { |
| 2792 | rcu_read_unlock(); |
| 2793 | netlbl_req_delattr(req); |
| 2794 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2795 | |
| 2796 | return rc; |
| 2797 | } |
| 2798 | |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 2799 | /** |
| 2800 | * smack_inet_csk_clone - Copy the connection information to the new socket |
| 2801 | * @sk: the new socket |
| 2802 | * @req: the connection's request_sock |
| 2803 | * |
| 2804 | * Transfer the connection's peer label to the newly created socket. |
| 2805 | */ |
| 2806 | static void smack_inet_csk_clone(struct sock *sk, |
| 2807 | const struct request_sock *req) |
| 2808 | { |
| 2809 | struct socket_smack *ssp = sk->sk_security; |
| 2810 | char *smack; |
| 2811 | |
| 2812 | if (req->peer_secid != 0) { |
| 2813 | smack = smack_from_secid(req->peer_secid); |
| 2814 | strncpy(ssp->smk_packet, smack, SMK_MAXLEN); |
| 2815 | } else |
| 2816 | ssp->smk_packet[0] = '\0'; |
| 2817 | } |
| 2818 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2819 | /* |
| 2820 | * Key management security hooks |
| 2821 | * |
| 2822 | * Casey has not tested key support very heavily. |
| 2823 | * The permission check is most likely too restrictive. |
| 2824 | * If you care about keys please have a look. |
| 2825 | */ |
| 2826 | #ifdef CONFIG_KEYS |
| 2827 | |
| 2828 | /** |
| 2829 | * smack_key_alloc - Set the key security blob |
| 2830 | * @key: object |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2831 | * @cred: the credentials to use |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2832 | * @flags: unused |
| 2833 | * |
| 2834 | * No allocation required |
| 2835 | * |
| 2836 | * Returns 0 |
| 2837 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2838 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2839 | unsigned long flags) |
| 2840 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2841 | key->security = cred->security; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2842 | return 0; |
| 2843 | } |
| 2844 | |
| 2845 | /** |
| 2846 | * smack_key_free - Clear the key security blob |
| 2847 | * @key: the object |
| 2848 | * |
| 2849 | * Clear the blob pointer |
| 2850 | */ |
| 2851 | static void smack_key_free(struct key *key) |
| 2852 | { |
| 2853 | key->security = NULL; |
| 2854 | } |
| 2855 | |
| 2856 | /* |
| 2857 | * smack_key_permission - Smack access on a key |
| 2858 | * @key_ref: gets to the object |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2859 | * @cred: the credentials to use |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2860 | * @perm: unused |
| 2861 | * |
| 2862 | * Return 0 if the task has read and write to the object, |
| 2863 | * an error code otherwise |
| 2864 | */ |
| 2865 | static int smack_key_permission(key_ref_t key_ref, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2866 | const struct cred *cred, key_perm_t perm) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2867 | { |
| 2868 | struct key *keyp; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2869 | struct smk_audit_info ad; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2870 | |
| 2871 | keyp = key_ref_to_ptr(key_ref); |
| 2872 | if (keyp == NULL) |
| 2873 | return -EINVAL; |
| 2874 | /* |
| 2875 | * If the key hasn't been initialized give it access so that |
| 2876 | * it may do so. |
| 2877 | */ |
| 2878 | if (keyp->security == NULL) |
| 2879 | return 0; |
| 2880 | /* |
| 2881 | * This should not occur |
| 2882 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2883 | if (cred->security == NULL) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2884 | return -EACCES; |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2885 | #ifdef CONFIG_AUDIT |
| 2886 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); |
| 2887 | ad.a.u.key_struct.key = keyp->serial; |
| 2888 | ad.a.u.key_struct.key_desc = keyp->description; |
| 2889 | #endif |
| 2890 | return smk_access(cred->security, keyp->security, |
| 2891 | MAY_READWRITE, &ad); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2892 | } |
| 2893 | #endif /* CONFIG_KEYS */ |
| 2894 | |
| 2895 | /* |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 2896 | * Smack Audit hooks |
| 2897 | * |
| 2898 | * Audit requires a unique representation of each Smack specific |
| 2899 | * rule. This unique representation is used to distinguish the |
| 2900 | * object to be audited from remaining kernel objects and also |
| 2901 | * works as a glue between the audit hooks. |
| 2902 | * |
| 2903 | * Since repository entries are added but never deleted, we'll use |
| 2904 | * the smack_known label address related to the given audit rule as |
| 2905 | * the needed unique representation. This also better fits the smack |
| 2906 | * model where nearly everything is a label. |
| 2907 | */ |
| 2908 | #ifdef CONFIG_AUDIT |
| 2909 | |
| 2910 | /** |
| 2911 | * smack_audit_rule_init - Initialize a smack audit rule |
| 2912 | * @field: audit rule fields given from user-space (audit.h) |
| 2913 | * @op: required testing operator (=, !=, >, <, ...) |
| 2914 | * @rulestr: smack label to be audited |
| 2915 | * @vrule: pointer to save our own audit rule representation |
| 2916 | * |
| 2917 | * Prepare to audit cases where (@field @op @rulestr) is true. |
| 2918 | * The label to be audited is created if necessay. |
| 2919 | */ |
| 2920 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
| 2921 | { |
| 2922 | char **rule = (char **)vrule; |
| 2923 | *rule = NULL; |
| 2924 | |
| 2925 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) |
| 2926 | return -EINVAL; |
| 2927 | |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 2928 | if (op != Audit_equal && op != Audit_not_equal) |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 2929 | return -EINVAL; |
| 2930 | |
| 2931 | *rule = smk_import(rulestr, 0); |
| 2932 | |
| 2933 | return 0; |
| 2934 | } |
| 2935 | |
| 2936 | /** |
| 2937 | * smack_audit_rule_known - Distinguish Smack audit rules |
| 2938 | * @krule: rule of interest, in Audit kernel representation format |
| 2939 | * |
| 2940 | * This is used to filter Smack rules from remaining Audit ones. |
| 2941 | * If it's proved that this rule belongs to us, the |
| 2942 | * audit_rule_match hook will be called to do the final judgement. |
| 2943 | */ |
| 2944 | static int smack_audit_rule_known(struct audit_krule *krule) |
| 2945 | { |
| 2946 | struct audit_field *f; |
| 2947 | int i; |
| 2948 | |
| 2949 | for (i = 0; i < krule->field_count; i++) { |
| 2950 | f = &krule->fields[i]; |
| 2951 | |
| 2952 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) |
| 2953 | return 1; |
| 2954 | } |
| 2955 | |
| 2956 | return 0; |
| 2957 | } |
| 2958 | |
| 2959 | /** |
| 2960 | * smack_audit_rule_match - Audit given object ? |
| 2961 | * @secid: security id for identifying the object to test |
| 2962 | * @field: audit rule flags given from user-space |
| 2963 | * @op: required testing operator |
| 2964 | * @vrule: smack internal rule presentation |
| 2965 | * @actx: audit context associated with the check |
| 2966 | * |
| 2967 | * The core Audit hook. It's used to take the decision of |
| 2968 | * whether to audit or not to audit a given object. |
| 2969 | */ |
| 2970 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, |
| 2971 | struct audit_context *actx) |
| 2972 | { |
| 2973 | char *smack; |
| 2974 | char *rule = vrule; |
| 2975 | |
| 2976 | if (!rule) { |
| 2977 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, |
| 2978 | "Smack: missing rule\n"); |
| 2979 | return -ENOENT; |
| 2980 | } |
| 2981 | |
| 2982 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) |
| 2983 | return 0; |
| 2984 | |
| 2985 | smack = smack_from_secid(secid); |
| 2986 | |
| 2987 | /* |
| 2988 | * No need to do string comparisons. If a match occurs, |
| 2989 | * both pointers will point to the same smack_known |
| 2990 | * label. |
| 2991 | */ |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 2992 | if (op == Audit_equal) |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 2993 | return (rule == smack); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 2994 | if (op == Audit_not_equal) |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 2995 | return (rule != smack); |
| 2996 | |
| 2997 | return 0; |
| 2998 | } |
| 2999 | |
| 3000 | /** |
| 3001 | * smack_audit_rule_free - free smack rule representation |
| 3002 | * @vrule: rule to be freed. |
| 3003 | * |
| 3004 | * No memory was allocated. |
| 3005 | */ |
| 3006 | static void smack_audit_rule_free(void *vrule) |
| 3007 | { |
| 3008 | /* No-op */ |
| 3009 | } |
| 3010 | |
| 3011 | #endif /* CONFIG_AUDIT */ |
| 3012 | |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 3013 | /** |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3014 | * smack_secid_to_secctx - return the smack label for a secid |
| 3015 | * @secid: incoming integer |
| 3016 | * @secdata: destination |
| 3017 | * @seclen: how long it is |
| 3018 | * |
| 3019 | * Exists for networking code. |
| 3020 | */ |
| 3021 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) |
| 3022 | { |
| 3023 | char *sp = smack_from_secid(secid); |
| 3024 | |
| 3025 | *secdata = sp; |
| 3026 | *seclen = strlen(sp); |
| 3027 | return 0; |
| 3028 | } |
| 3029 | |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 3030 | /** |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 3031 | * smack_secctx_to_secid - return the secid for a smack label |
| 3032 | * @secdata: smack label |
| 3033 | * @seclen: how long result is |
| 3034 | * @secid: outgoing integer |
| 3035 | * |
| 3036 | * Exists for audit and networking code. |
| 3037 | */ |
David Howells | e52c1764 | 2008-04-29 20:52:51 +0100 | [diff] [blame] | 3038 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 3039 | { |
| 3040 | *secid = smack_to_secid(secdata); |
| 3041 | return 0; |
| 3042 | } |
| 3043 | |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 3044 | /** |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3045 | * smack_release_secctx - don't do anything. |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 3046 | * @secdata: unused |
| 3047 | * @seclen: unused |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3048 | * |
| 3049 | * Exists to make sure nothing gets done, and properly |
| 3050 | */ |
| 3051 | static void smack_release_secctx(char *secdata, u32 seclen) |
| 3052 | { |
| 3053 | } |
| 3054 | |
David P. Quigley | 1ee65e3 | 2009-09-03 14:25:57 -0400 | [diff] [blame] | 3055 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
| 3056 | { |
| 3057 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); |
| 3058 | } |
| 3059 | |
| 3060 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) |
| 3061 | { |
| 3062 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); |
| 3063 | } |
| 3064 | |
| 3065 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) |
| 3066 | { |
| 3067 | int len = 0; |
| 3068 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); |
| 3069 | |
| 3070 | if (len < 0) |
| 3071 | return len; |
| 3072 | *ctxlen = len; |
| 3073 | return 0; |
| 3074 | } |
| 3075 | |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 3076 | struct security_operations smack_ops = { |
| 3077 | .name = "smack", |
| 3078 | |
Ingo Molnar | 9e48858 | 2009-05-07 19:26:19 +1000 | [diff] [blame] | 3079 | .ptrace_access_check = smack_ptrace_access_check, |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 3080 | .ptrace_traceme = smack_ptrace_traceme, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3081 | .syslog = smack_syslog, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3082 | |
| 3083 | .sb_alloc_security = smack_sb_alloc_security, |
| 3084 | .sb_free_security = smack_sb_free_security, |
| 3085 | .sb_copy_data = smack_sb_copy_data, |
| 3086 | .sb_kern_mount = smack_sb_kern_mount, |
| 3087 | .sb_statfs = smack_sb_statfs, |
| 3088 | .sb_mount = smack_sb_mount, |
| 3089 | .sb_umount = smack_sb_umount, |
| 3090 | |
| 3091 | .inode_alloc_security = smack_inode_alloc_security, |
| 3092 | .inode_free_security = smack_inode_free_security, |
| 3093 | .inode_init_security = smack_inode_init_security, |
| 3094 | .inode_link = smack_inode_link, |
| 3095 | .inode_unlink = smack_inode_unlink, |
| 3096 | .inode_rmdir = smack_inode_rmdir, |
| 3097 | .inode_rename = smack_inode_rename, |
| 3098 | .inode_permission = smack_inode_permission, |
| 3099 | .inode_setattr = smack_inode_setattr, |
| 3100 | .inode_getattr = smack_inode_getattr, |
| 3101 | .inode_setxattr = smack_inode_setxattr, |
| 3102 | .inode_post_setxattr = smack_inode_post_setxattr, |
| 3103 | .inode_getxattr = smack_inode_getxattr, |
| 3104 | .inode_removexattr = smack_inode_removexattr, |
| 3105 | .inode_getsecurity = smack_inode_getsecurity, |
| 3106 | .inode_setsecurity = smack_inode_setsecurity, |
| 3107 | .inode_listsecurity = smack_inode_listsecurity, |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 3108 | .inode_getsecid = smack_inode_getsecid, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3109 | |
| 3110 | .file_permission = smack_file_permission, |
| 3111 | .file_alloc_security = smack_file_alloc_security, |
| 3112 | .file_free_security = smack_file_free_security, |
| 3113 | .file_ioctl = smack_file_ioctl, |
| 3114 | .file_lock = smack_file_lock, |
| 3115 | .file_fcntl = smack_file_fcntl, |
| 3116 | .file_set_fowner = smack_file_set_fowner, |
| 3117 | .file_send_sigiotask = smack_file_send_sigiotask, |
| 3118 | .file_receive = smack_file_receive, |
| 3119 | |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 3120 | .cred_alloc_blank = smack_cred_alloc_blank, |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3121 | .cred_free = smack_cred_free, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3122 | .cred_prepare = smack_cred_prepare, |
| 3123 | .cred_commit = smack_cred_commit, |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 3124 | .cred_transfer = smack_cred_transfer, |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 3125 | .kernel_act_as = smack_kernel_act_as, |
| 3126 | .kernel_create_files_as = smack_kernel_create_files_as, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3127 | .task_setpgid = smack_task_setpgid, |
| 3128 | .task_getpgid = smack_task_getpgid, |
| 3129 | .task_getsid = smack_task_getsid, |
| 3130 | .task_getsecid = smack_task_getsecid, |
| 3131 | .task_setnice = smack_task_setnice, |
| 3132 | .task_setioprio = smack_task_setioprio, |
| 3133 | .task_getioprio = smack_task_getioprio, |
| 3134 | .task_setscheduler = smack_task_setscheduler, |
| 3135 | .task_getscheduler = smack_task_getscheduler, |
| 3136 | .task_movememory = smack_task_movememory, |
| 3137 | .task_kill = smack_task_kill, |
| 3138 | .task_wait = smack_task_wait, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3139 | .task_to_inode = smack_task_to_inode, |
| 3140 | |
| 3141 | .ipc_permission = smack_ipc_permission, |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 3142 | .ipc_getsecid = smack_ipc_getsecid, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3143 | |
| 3144 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, |
| 3145 | .msg_msg_free_security = smack_msg_msg_free_security, |
| 3146 | |
| 3147 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, |
| 3148 | .msg_queue_free_security = smack_msg_queue_free_security, |
| 3149 | .msg_queue_associate = smack_msg_queue_associate, |
| 3150 | .msg_queue_msgctl = smack_msg_queue_msgctl, |
| 3151 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, |
| 3152 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, |
| 3153 | |
| 3154 | .shm_alloc_security = smack_shm_alloc_security, |
| 3155 | .shm_free_security = smack_shm_free_security, |
| 3156 | .shm_associate = smack_shm_associate, |
| 3157 | .shm_shmctl = smack_shm_shmctl, |
| 3158 | .shm_shmat = smack_shm_shmat, |
| 3159 | |
| 3160 | .sem_alloc_security = smack_sem_alloc_security, |
| 3161 | .sem_free_security = smack_sem_free_security, |
| 3162 | .sem_associate = smack_sem_associate, |
| 3163 | .sem_semctl = smack_sem_semctl, |
| 3164 | .sem_semop = smack_sem_semop, |
| 3165 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3166 | .d_instantiate = smack_d_instantiate, |
| 3167 | |
| 3168 | .getprocattr = smack_getprocattr, |
| 3169 | .setprocattr = smack_setprocattr, |
| 3170 | |
| 3171 | .unix_stream_connect = smack_unix_stream_connect, |
| 3172 | .unix_may_send = smack_unix_may_send, |
| 3173 | |
| 3174 | .socket_post_create = smack_socket_post_create, |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 3175 | .socket_connect = smack_socket_connect, |
| 3176 | .socket_sendmsg = smack_socket_sendmsg, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3177 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
| 3178 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, |
| 3179 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, |
| 3180 | .sk_alloc_security = smack_sk_alloc_security, |
| 3181 | .sk_free_security = smack_sk_free_security, |
| 3182 | .sock_graft = smack_sock_graft, |
| 3183 | .inet_conn_request = smack_inet_conn_request, |
Paul Moore | 07feee8 | 2009-03-27 17:10:54 -0400 | [diff] [blame] | 3184 | .inet_csk_clone = smack_inet_csk_clone, |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 3185 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3186 | /* key management security hooks */ |
| 3187 | #ifdef CONFIG_KEYS |
| 3188 | .key_alloc = smack_key_alloc, |
| 3189 | .key_free = smack_key_free, |
| 3190 | .key_permission = smack_key_permission, |
| 3191 | #endif /* CONFIG_KEYS */ |
Ahmed S. Darwish | d20bdda | 2008-04-30 08:34:10 +1000 | [diff] [blame] | 3192 | |
| 3193 | /* Audit hooks */ |
| 3194 | #ifdef CONFIG_AUDIT |
| 3195 | .audit_rule_init = smack_audit_rule_init, |
| 3196 | .audit_rule_known = smack_audit_rule_known, |
| 3197 | .audit_rule_match = smack_audit_rule_match, |
| 3198 | .audit_rule_free = smack_audit_rule_free, |
| 3199 | #endif /* CONFIG_AUDIT */ |
| 3200 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3201 | .secid_to_secctx = smack_secid_to_secctx, |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 3202 | .secctx_to_secid = smack_secctx_to_secid, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3203 | .release_secctx = smack_release_secctx, |
David P. Quigley | 1ee65e3 | 2009-09-03 14:25:57 -0400 | [diff] [blame] | 3204 | .inode_notifysecctx = smack_inode_notifysecctx, |
| 3205 | .inode_setsecctx = smack_inode_setsecctx, |
| 3206 | .inode_getsecctx = smack_inode_getsecctx, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3207 | }; |
| 3208 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 3209 | |
| 3210 | static __init void init_smack_know_list(void) |
| 3211 | { |
| 3212 | list_add(&smack_known_huh.list, &smack_known_list); |
| 3213 | list_add(&smack_known_hat.list, &smack_known_list); |
| 3214 | list_add(&smack_known_star.list, &smack_known_list); |
| 3215 | list_add(&smack_known_floor.list, &smack_known_list); |
| 3216 | list_add(&smack_known_invalid.list, &smack_known_list); |
| 3217 | list_add(&smack_known_web.list, &smack_known_list); |
| 3218 | } |
| 3219 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3220 | /** |
| 3221 | * smack_init - initialize the smack system |
| 3222 | * |
| 3223 | * Returns 0 |
| 3224 | */ |
| 3225 | static __init int smack_init(void) |
| 3226 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3227 | struct cred *cred; |
| 3228 | |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 3229 | if (!security_module_enable(&smack_ops)) |
| 3230 | return 0; |
| 3231 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3232 | printk(KERN_INFO "Smack: Initializing.\n"); |
| 3233 | |
| 3234 | /* |
| 3235 | * Set the security state for the initial task. |
| 3236 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3237 | cred = (struct cred *) current->cred; |
| 3238 | cred->security = &smack_known_floor.smk_known; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3239 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 3240 | /* initilize the smack_know_list */ |
| 3241 | init_smack_know_list(); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3242 | /* |
| 3243 | * Initialize locks |
| 3244 | */ |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 3245 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
| 3246 | spin_lock_init(&smack_known_hat.smk_cipsolock); |
| 3247 | spin_lock_init(&smack_known_star.smk_cipsolock); |
| 3248 | spin_lock_init(&smack_known_floor.smk_cipsolock); |
| 3249 | spin_lock_init(&smack_known_invalid.smk_cipsolock); |
| 3250 | |
| 3251 | /* |
| 3252 | * Register with LSM |
| 3253 | */ |
| 3254 | if (register_security(&smack_ops)) |
| 3255 | panic("smack: Unable to register with kernel.\n"); |
| 3256 | |
| 3257 | return 0; |
| 3258 | } |
| 3259 | |
| 3260 | /* |
| 3261 | * Smack requires early initialization in order to label |
| 3262 | * all processes and objects when they are created. |
| 3263 | */ |
| 3264 | security_initcall(smack_init); |