| 85c8721 | 2005-04-29 16:23:29 +0100 | [diff] [blame] | 1 | /* audit.c -- Auditing support |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Gateway between the kernel (e.g., selinux) and the user-space audit daemon. |
| 3 | * System-call specific features have moved to auditsc.c |
| 4 | * |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 5 | * Copyright 2003-2007 Red Hat Inc., Durham, North Carolina. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * All Rights Reserved. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | * |
| 22 | * Written by Rickard E. (Rik) Faith <faith@redhat.com> |
| 23 | * |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 24 | * Goals: 1) Integrate fully with Security Modules. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | * 2) Minimal run-time overhead: |
| 26 | * a) Minimal when syscall auditing is disabled (audit_enable=0). |
| 27 | * b) Small when syscall auditing is enabled and no audit record |
| 28 | * is generated (defer as much work as possible to record |
| 29 | * generation time): |
| 30 | * i) context is allocated, |
| 31 | * ii) names from getname are stored without a copy, and |
| 32 | * iii) inode information stored from path_lookup. |
| 33 | * 3) Ability to disable syscall auditing at boot time (audit=0). |
| 34 | * 4) Usable by other parts of the kernel (if audit_log* is called, |
| 35 | * then a syscall record will be generated automatically for the |
| 36 | * current syscall). |
| 37 | * 5) Netlink interface to user-space. |
| 38 | * 6) Support low-overhead kernel-based filtering to minimize the |
| 39 | * information that must be passed to user-space. |
| 40 | * |
| 85c8721 | 2005-04-29 16:23:29 +0100 | [diff] [blame] | 41 | * Example user-space utilities: http://people.redhat.com/sgrubb/audit/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | */ |
| 43 | |
| 44 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <asm/types.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 46 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/mm.h> |
Paul Gortmaker | 9984de1 | 2011-05-23 14:51:41 -0400 | [diff] [blame] | 48 | #include <linux/export.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 49 | #include <linux/slab.h> |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 50 | #include <linux/err.h> |
| 51 | #include <linux/kthread.h> |
Richard Guy Briggs | 46e959e | 2013-05-03 14:03:50 -0400 | [diff] [blame] | 52 | #include <linux/kernel.h> |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 53 | #include <linux/syscalls.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | #include <linux/audit.h> |
| 56 | |
| 57 | #include <net/sock.h> |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 58 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #include <linux/skbuff.h> |
Mr Dash Four | 131ad62 | 2011-06-30 13:31:57 +0200 | [diff] [blame] | 60 | #ifdef CONFIG_SECURITY |
| 61 | #include <linux/security.h> |
| 62 | #endif |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 63 | #include <linux/freezer.h> |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 64 | #include <linux/tty.h> |
Eric W. Biederman | 34e36d8 | 2012-09-10 23:20:20 -0700 | [diff] [blame] | 65 | #include <linux/pid_namespace.h> |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 66 | |
| 67 | #include "audit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 69 | /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | * (Initialization happens after skb_init is called.) */ |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 71 | #define AUDIT_DISABLED -1 |
| 72 | #define AUDIT_UNINITIALIZED 0 |
| 73 | #define AUDIT_INITIALIZED 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | static int audit_initialized; |
| 75 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 76 | #define AUDIT_OFF 0 |
| 77 | #define AUDIT_ON 1 |
| 78 | #define AUDIT_LOCKED 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | int audit_enabled; |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 80 | int audit_ever_enabled; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Jan Engelhardt | ae9d67af | 2011-01-18 06:48:12 +0100 | [diff] [blame] | 82 | EXPORT_SYMBOL_GPL(audit_enabled); |
| 83 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | /* Default state when kernel boots without any parameters. */ |
| 85 | static int audit_default; |
| 86 | |
| 87 | /* If auditing cannot proceed, audit_failure selects what happens. */ |
| 88 | static int audit_failure = AUDIT_FAIL_PRINTK; |
| 89 | |
Pavel Emelyanov | 75c0371 | 2008-03-20 15:39:41 -0700 | [diff] [blame] | 90 | /* |
| 91 | * If audit records are to be written to the netlink socket, audit_pid |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 92 | * contains the pid of the auditd process and audit_nlk_portid contains |
| 93 | * the portid to use to send netlink messages to that process. |
Pavel Emelyanov | 75c0371 | 2008-03-20 15:39:41 -0700 | [diff] [blame] | 94 | */ |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 95 | int audit_pid; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 96 | static int audit_nlk_portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 98 | /* If audit_rate_limit is non-zero, limit the rate of sending audit records |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | * to that number per second. This prevents DoS attacks, but results in |
| 100 | * audit records being dropped. */ |
| 101 | static int audit_rate_limit; |
| 102 | |
| 103 | /* Number of outstanding audit_buffers allowed. */ |
| 104 | static int audit_backlog_limit = 64; |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 105 | static int audit_backlog_wait_time = 60 * HZ; |
| 106 | static int audit_backlog_wait_overflow = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 108 | /* The identity of the user shutting down the audit system. */ |
Eric W. Biederman | cca080d | 2012-02-07 16:53:48 -0800 | [diff] [blame] | 109 | kuid_t audit_sig_uid = INVALID_UID; |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 110 | pid_t audit_sig_pid = -1; |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 111 | u32 audit_sig_sid = 0; |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | /* Records can be lost in several ways: |
| 114 | 0) [suppressed in audit_alloc] |
| 115 | 1) out of memory in audit_log_start [kmalloc of struct audit_buffer] |
| 116 | 2) out of memory in audit_log_move [alloc_skb] |
| 117 | 3) suppressed due to audit_rate_limit |
| 118 | 4) suppressed due to audit_backlog_limit |
| 119 | */ |
| 120 | static atomic_t audit_lost = ATOMIC_INIT(0); |
| 121 | |
| 122 | /* The netlink socket. */ |
| 123 | static struct sock *audit_sock; |
| 124 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 125 | /* Hash for inode-based rules */ |
| 126 | struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; |
| 127 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 128 | /* The audit_freelist is a list of pre-allocated audit buffers (if more |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of |
| 130 | * being placed on the freelist). */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | static DEFINE_SPINLOCK(audit_freelist_lock); |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 132 | static int audit_freelist_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | static LIST_HEAD(audit_freelist); |
| 134 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 135 | static struct sk_buff_head audit_skb_queue; |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 136 | /* queue of skbs to send to auditd when/if it comes back */ |
| 137 | static struct sk_buff_head audit_skb_hold_queue; |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 138 | static struct task_struct *kauditd_task; |
| 139 | static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait); |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 140 | static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 142 | static struct audit_features af = {.vers = AUDIT_FEATURE_VERSION, |
| 143 | .mask = -1, |
| 144 | .features = 0, |
| 145 | .lock = 0,}; |
| 146 | |
Eric Paris | d040e5a | 2013-05-24 09:18:04 -0400 | [diff] [blame^] | 147 | static char *audit_feature_names[1] = { |
| 148 | "only_unset_loginuid", |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 149 | }; |
| 150 | |
| 151 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 152 | /* Serialize requests from userspace. */ |
Al Viro | 916d757 | 2009-06-24 00:02:38 -0400 | [diff] [blame] | 153 | DEFINE_MUTEX(audit_cmd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
| 155 | /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting |
| 156 | * audit records. Since printk uses a 1024 byte buffer, this buffer |
| 157 | * should be at least that large. */ |
| 158 | #define AUDIT_BUFSIZ 1024 |
| 159 | |
| 160 | /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the |
| 161 | * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */ |
| 162 | #define AUDIT_MAXFREE (2*NR_CPUS) |
| 163 | |
| 164 | /* The audit_buffer is used when formatting an audit record. The caller |
| 165 | * locks briefly to get the record off the freelist or to allocate the |
| 166 | * buffer, and locks briefly to send the buffer to the netlink layer or |
| 167 | * to place it on a transmit queue. Multiple audit_buffers can be in |
| 168 | * use simultaneously. */ |
| 169 | struct audit_buffer { |
| 170 | struct list_head list; |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 171 | struct sk_buff *skb; /* formatted skb ready to send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | struct audit_context *ctx; /* NULL or associated context */ |
Al Viro | 9796fdd | 2005-10-21 03:22:03 -0400 | [diff] [blame] | 173 | gfp_t gfp_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | }; |
| 175 | |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 176 | struct audit_reply { |
| 177 | int pid; |
| 178 | struct sk_buff *skb; |
| 179 | }; |
| 180 | |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 181 | static void audit_set_pid(struct audit_buffer *ab, pid_t pid) |
| 182 | { |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 183 | if (ab) { |
| 184 | struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); |
| 185 | nlh->nlmsg_pid = pid; |
| 186 | } |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 187 | } |
| 188 | |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 189 | void audit_panic(const char *message) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | { |
| 191 | switch (audit_failure) |
| 192 | { |
| 193 | case AUDIT_FAIL_SILENT: |
| 194 | break; |
| 195 | case AUDIT_FAIL_PRINTK: |
Eric Paris | 320f1b1 | 2008-01-23 22:55:05 -0500 | [diff] [blame] | 196 | if (printk_ratelimit()) |
| 197 | printk(KERN_ERR "audit: %s\n", message); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | break; |
| 199 | case AUDIT_FAIL_PANIC: |
Eric Paris | b29ee87 | 2008-02-21 15:53:05 -0500 | [diff] [blame] | 200 | /* test audit_pid since printk is always losey, why bother? */ |
| 201 | if (audit_pid) |
| 202 | panic("audit: %s\n", message); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | break; |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | static inline int audit_rate_check(void) |
| 208 | { |
| 209 | static unsigned long last_check = 0; |
| 210 | static int messages = 0; |
| 211 | static DEFINE_SPINLOCK(lock); |
| 212 | unsigned long flags; |
| 213 | unsigned long now; |
| 214 | unsigned long elapsed; |
| 215 | int retval = 0; |
| 216 | |
| 217 | if (!audit_rate_limit) return 1; |
| 218 | |
| 219 | spin_lock_irqsave(&lock, flags); |
| 220 | if (++messages < audit_rate_limit) { |
| 221 | retval = 1; |
| 222 | } else { |
| 223 | now = jiffies; |
| 224 | elapsed = now - last_check; |
| 225 | if (elapsed > HZ) { |
| 226 | last_check = now; |
| 227 | messages = 0; |
| 228 | retval = 1; |
| 229 | } |
| 230 | } |
| 231 | spin_unlock_irqrestore(&lock, flags); |
| 232 | |
| 233 | return retval; |
| 234 | } |
| 235 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 236 | /** |
| 237 | * audit_log_lost - conditionally log lost audit message event |
| 238 | * @message: the message stating reason for lost audit message |
| 239 | * |
| 240 | * Emit at least 1 message per second, even if audit_rate_check is |
| 241 | * throttling. |
| 242 | * Always increment the lost messages counter. |
| 243 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | void audit_log_lost(const char *message) |
| 245 | { |
| 246 | static unsigned long last_msg = 0; |
| 247 | static DEFINE_SPINLOCK(lock); |
| 248 | unsigned long flags; |
| 249 | unsigned long now; |
| 250 | int print; |
| 251 | |
| 252 | atomic_inc(&audit_lost); |
| 253 | |
| 254 | print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit); |
| 255 | |
| 256 | if (!print) { |
| 257 | spin_lock_irqsave(&lock, flags); |
| 258 | now = jiffies; |
| 259 | if (now - last_msg > HZ) { |
| 260 | print = 1; |
| 261 | last_msg = now; |
| 262 | } |
| 263 | spin_unlock_irqrestore(&lock, flags); |
| 264 | } |
| 265 | |
| 266 | if (print) { |
Eric Paris | 320f1b1 | 2008-01-23 22:55:05 -0500 | [diff] [blame] | 267 | if (printk_ratelimit()) |
| 268 | printk(KERN_WARNING |
| 269 | "audit: audit_lost=%d audit_rate_limit=%d " |
| 270 | "audit_backlog_limit=%d\n", |
| 271 | atomic_read(&audit_lost), |
| 272 | audit_rate_limit, |
| 273 | audit_backlog_limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | audit_panic(message); |
| 275 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | } |
| 277 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 278 | static int audit_log_config_change(char *function_name, int new, int old, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 279 | int allow_changes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | { |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 281 | struct audit_buffer *ab; |
| 282 | int rc = 0; |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 283 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 284 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); |
Kees Cook | 0644ec0 | 2013-01-11 14:32:07 -0800 | [diff] [blame] | 285 | if (unlikely(!ab)) |
| 286 | return rc; |
Eric Paris | 4d3fb70 | 2013-04-30 09:53:34 -0400 | [diff] [blame] | 287 | audit_log_format(ab, "%s=%d old=%d", function_name, new, old); |
| 288 | audit_log_session_info(ab); |
Eric Paris | b122c37 | 2013-04-19 15:00:33 -0400 | [diff] [blame] | 289 | rc = audit_log_task_context(ab); |
| 290 | if (rc) |
| 291 | allow_changes = 0; /* Something weird, deny request */ |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 292 | audit_log_format(ab, " res=%d", allow_changes); |
| 293 | audit_log_end(ab); |
| 294 | return rc; |
| 295 | } |
| 296 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 297 | static int audit_do_config_change(char *function_name, int *to_change, int new) |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 298 | { |
| 299 | int allow_changes, rc = 0, old = *to_change; |
| 300 | |
| 301 | /* check if we are locked */ |
| 302 | if (audit_enabled == AUDIT_LOCKED) |
| 303 | allow_changes = 0; |
| 304 | else |
| 305 | allow_changes = 1; |
| 306 | |
| 307 | if (audit_enabled != AUDIT_OFF) { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 308 | rc = audit_log_config_change(function_name, new, old, allow_changes); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 309 | if (rc) |
| 310 | allow_changes = 0; |
| 311 | } |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 312 | |
| 313 | /* If we are allowed, make the change */ |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 314 | if (allow_changes == 1) |
| 315 | *to_change = new; |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 316 | /* Not allowed, update reason */ |
| 317 | else if (rc == 0) |
| 318 | rc = -EPERM; |
| 319 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | } |
| 321 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 322 | static int audit_set_rate_limit(int limit) |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 323 | { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 324 | return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 325 | } |
| 326 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 327 | static int audit_set_backlog_limit(int limit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 329 | return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | } |
| 331 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 332 | static int audit_set_enabled(int state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | { |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 334 | int rc; |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 335 | if (state < AUDIT_OFF || state > AUDIT_LOCKED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | return -EINVAL; |
Steve Grubb | ce29b68 | 2006-04-01 18:29:34 -0500 | [diff] [blame] | 337 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 338 | rc = audit_do_config_change("audit_enabled", &audit_enabled, state); |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 339 | if (!rc) |
| 340 | audit_ever_enabled |= !!state; |
| 341 | |
| 342 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
| 344 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 345 | static int audit_set_failure(int state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | if (state != AUDIT_FAIL_SILENT |
| 348 | && state != AUDIT_FAIL_PRINTK |
| 349 | && state != AUDIT_FAIL_PANIC) |
| 350 | return -EINVAL; |
Steve Grubb | ce29b68 | 2006-04-01 18:29:34 -0500 | [diff] [blame] | 351 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 352 | return audit_do_config_change("audit_failure", &audit_failure, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
| 354 | |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 355 | /* |
| 356 | * Queue skbs to be sent to auditd when/if it comes back. These skbs should |
| 357 | * already have been sent via prink/syslog and so if these messages are dropped |
| 358 | * it is not a huge concern since we already passed the audit_log_lost() |
| 359 | * notification and stuff. This is just nice to get audit messages during |
| 360 | * boot before auditd is running or messages generated while auditd is stopped. |
| 361 | * This only holds messages is audit_default is set, aka booting with audit=1 |
| 362 | * or building your kernel that way. |
| 363 | */ |
| 364 | static void audit_hold_skb(struct sk_buff *skb) |
| 365 | { |
| 366 | if (audit_default && |
| 367 | skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit) |
| 368 | skb_queue_tail(&audit_skb_hold_queue, skb); |
| 369 | else |
| 370 | kfree_skb(skb); |
| 371 | } |
| 372 | |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 373 | /* |
| 374 | * For one reason or another this nlh isn't getting delivered to the userspace |
| 375 | * audit daemon, just send it to printk. |
| 376 | */ |
| 377 | static void audit_printk_skb(struct sk_buff *skb) |
| 378 | { |
| 379 | struct nlmsghdr *nlh = nlmsg_hdr(skb); |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 380 | char *data = nlmsg_data(nlh); |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 381 | |
| 382 | if (nlh->nlmsg_type != AUDIT_EOE) { |
| 383 | if (printk_ratelimit()) |
| 384 | printk(KERN_NOTICE "type=%d %s\n", nlh->nlmsg_type, data); |
| 385 | else |
| 386 | audit_log_lost("printk limit exceeded\n"); |
| 387 | } |
| 388 | |
| 389 | audit_hold_skb(skb); |
| 390 | } |
| 391 | |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 392 | static void kauditd_send_skb(struct sk_buff *skb) |
| 393 | { |
| 394 | int err; |
| 395 | /* take a reference in case we can't send it and we want to hold it */ |
| 396 | skb_get(skb); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 397 | err = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 398 | if (err < 0) { |
Adam Buchbinder | c9404c9 | 2009-12-18 15:40:42 -0500 | [diff] [blame] | 399 | BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */ |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 400 | printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid); |
Ross Kirk | 9db3b9b | 2010-10-22 16:43:17 +0100 | [diff] [blame] | 401 | audit_log_lost("auditd disappeared\n"); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 402 | audit_pid = 0; |
| 403 | /* we might get lucky and get this in the next auditd */ |
| 404 | audit_hold_skb(skb); |
| 405 | } else |
| 406 | /* drop the extra reference if sent ok */ |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 407 | consume_skb(skb); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 408 | } |
| 409 | |
Richard Guy Briggs | b551d1d | 2013-01-24 13:15:10 -0500 | [diff] [blame] | 410 | /* |
| 411 | * flush_hold_queue - empty the hold queue if auditd appears |
| 412 | * |
| 413 | * If auditd just started, drain the queue of messages already |
| 414 | * sent to syslog/printk. Remember loss here is ok. We already |
| 415 | * called audit_log_lost() if it didn't go out normally. so the |
| 416 | * race between the skb_dequeue and the next check for audit_pid |
| 417 | * doesn't matter. |
| 418 | * |
| 419 | * If you ever find kauditd to be too slow we can get a perf win |
| 420 | * by doing our own locking and keeping better track if there |
| 421 | * are messages in this queue. I don't see the need now, but |
| 422 | * in 5 years when I want to play with this again I'll see this |
| 423 | * note and still have no friggin idea what i'm thinking today. |
| 424 | */ |
| 425 | static void flush_hold_queue(void) |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 426 | { |
| 427 | struct sk_buff *skb; |
| 428 | |
Richard Guy Briggs | b551d1d | 2013-01-24 13:15:10 -0500 | [diff] [blame] | 429 | if (!audit_default || !audit_pid) |
| 430 | return; |
| 431 | |
| 432 | skb = skb_dequeue(&audit_skb_hold_queue); |
| 433 | if (likely(!skb)) |
| 434 | return; |
| 435 | |
| 436 | while (skb && audit_pid) { |
| 437 | kauditd_send_skb(skb); |
| 438 | skb = skb_dequeue(&audit_skb_hold_queue); |
| 439 | } |
| 440 | |
| 441 | /* |
| 442 | * if auditd just disappeared but we |
| 443 | * dequeued an skb we need to drop ref |
| 444 | */ |
| 445 | if (skb) |
| 446 | consume_skb(skb); |
| 447 | } |
| 448 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 449 | static int kauditd_thread(void *dummy) |
| 450 | { |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 451 | set_freezable(); |
Andrew Morton | 4899b8b | 2006-10-06 00:43:48 -0700 | [diff] [blame] | 452 | while (!kthread_should_stop()) { |
Richard Guy Briggs | 3320c51 | 2013-01-24 13:15:11 -0500 | [diff] [blame] | 453 | struct sk_buff *skb; |
| 454 | DECLARE_WAITQUEUE(wait, current); |
| 455 | |
Richard Guy Briggs | b551d1d | 2013-01-24 13:15:10 -0500 | [diff] [blame] | 456 | flush_hold_queue(); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 457 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 458 | skb = skb_dequeue(&audit_skb_queue); |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 459 | wake_up(&audit_backlog_wait); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 460 | if (skb) { |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 461 | if (audit_pid) |
| 462 | kauditd_send_skb(skb); |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 463 | else |
| 464 | audit_printk_skb(skb); |
Richard Guy Briggs | 3320c51 | 2013-01-24 13:15:11 -0500 | [diff] [blame] | 465 | continue; |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 466 | } |
Richard Guy Briggs | 3320c51 | 2013-01-24 13:15:11 -0500 | [diff] [blame] | 467 | set_current_state(TASK_INTERRUPTIBLE); |
| 468 | add_wait_queue(&kauditd_wait, &wait); |
| 469 | |
| 470 | if (!skb_queue_len(&audit_skb_queue)) { |
| 471 | try_to_freeze(); |
| 472 | schedule(); |
| 473 | } |
| 474 | |
| 475 | __set_current_state(TASK_RUNNING); |
| 476 | remove_wait_queue(&kauditd_wait, &wait); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 477 | } |
Andrew Morton | 4899b8b | 2006-10-06 00:43:48 -0700 | [diff] [blame] | 478 | return 0; |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 479 | } |
| 480 | |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 481 | int audit_send_list(void *_dest) |
| 482 | { |
| 483 | struct audit_netlink_list *dest = _dest; |
| 484 | int pid = dest->pid; |
| 485 | struct sk_buff *skb; |
| 486 | |
| 487 | /* wait for parent to finish and send an ACK */ |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 488 | mutex_lock(&audit_cmd_mutex); |
| 489 | mutex_unlock(&audit_cmd_mutex); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 490 | |
| 491 | while ((skb = __skb_dequeue(&dest->q)) != NULL) |
| 492 | netlink_unicast(audit_sock, skb, pid, 0); |
| 493 | |
| 494 | kfree(dest); |
| 495 | |
| 496 | return 0; |
| 497 | } |
| 498 | |
| 499 | struct sk_buff *audit_make_reply(int pid, int seq, int type, int done, |
Stephen Hemminger | b8800aa | 2010-10-20 17:23:50 -0700 | [diff] [blame] | 500 | int multi, const void *payload, int size) |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 501 | { |
| 502 | struct sk_buff *skb; |
| 503 | struct nlmsghdr *nlh; |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 504 | void *data; |
| 505 | int flags = multi ? NLM_F_MULTI : 0; |
| 506 | int t = done ? NLMSG_DONE : type; |
| 507 | |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 508 | skb = nlmsg_new(size, GFP_KERNEL); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 509 | if (!skb) |
| 510 | return NULL; |
| 511 | |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 512 | nlh = nlmsg_put(skb, pid, seq, t, size, flags); |
| 513 | if (!nlh) |
| 514 | goto out_kfree_skb; |
| 515 | data = nlmsg_data(nlh); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 516 | memcpy(data, payload, size); |
| 517 | return skb; |
| 518 | |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 519 | out_kfree_skb: |
| 520 | kfree_skb(skb); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 521 | return NULL; |
| 522 | } |
| 523 | |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 524 | static int audit_send_reply_thread(void *arg) |
| 525 | { |
| 526 | struct audit_reply *reply = (struct audit_reply *)arg; |
| 527 | |
| 528 | mutex_lock(&audit_cmd_mutex); |
| 529 | mutex_unlock(&audit_cmd_mutex); |
| 530 | |
| 531 | /* Ignore failure. It'll only happen if the sender goes away, |
| 532 | because our timeout is set to infinite. */ |
| 533 | netlink_unicast(audit_sock, reply->skb, reply->pid, 0); |
| 534 | kfree(reply); |
| 535 | return 0; |
| 536 | } |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 537 | /** |
| 538 | * audit_send_reply - send an audit reply message via netlink |
| 539 | * @pid: process id to send reply to |
| 540 | * @seq: sequence number |
| 541 | * @type: audit message type |
| 542 | * @done: done (last) flag |
| 543 | * @multi: multi-part message flag |
| 544 | * @payload: payload data |
| 545 | * @size: payload size |
| 546 | * |
| 547 | * Allocates an skb, builds the netlink message, and sends it to the pid. |
| 548 | * No failure notifications. |
| 549 | */ |
Stephen Hemminger | b8800aa | 2010-10-20 17:23:50 -0700 | [diff] [blame] | 550 | static void audit_send_reply(int pid, int seq, int type, int done, int multi, |
| 551 | const void *payload, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | { |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 553 | struct sk_buff *skb; |
| 554 | struct task_struct *tsk; |
| 555 | struct audit_reply *reply = kmalloc(sizeof(struct audit_reply), |
| 556 | GFP_KERNEL); |
| 557 | |
| 558 | if (!reply) |
| 559 | return; |
| 560 | |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 561 | skb = audit_make_reply(pid, seq, type, done, multi, payload, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | if (!skb) |
Andrew Morton | fcaf1eb | 2008-05-14 16:11:48 -0700 | [diff] [blame] | 563 | goto out; |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 564 | |
| 565 | reply->pid = pid; |
| 566 | reply->skb = skb; |
| 567 | |
| 568 | tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply"); |
Andrew Morton | fcaf1eb | 2008-05-14 16:11:48 -0700 | [diff] [blame] | 569 | if (!IS_ERR(tsk)) |
| 570 | return; |
| 571 | kfree_skb(skb); |
| 572 | out: |
| 573 | kfree(reply); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | /* |
| 577 | * Check for appropriate CAP_AUDIT_ capabilities on incoming audit |
| 578 | * control messages. |
| 579 | */ |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 580 | static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | { |
| 582 | int err = 0; |
| 583 | |
Eric W. Biederman | 34e36d8 | 2012-09-10 23:20:20 -0700 | [diff] [blame] | 584 | /* Only support the initial namespaces for now. */ |
| 585 | if ((current_user_ns() != &init_user_ns) || |
| 586 | (task_active_pid_ns(current) != &init_pid_ns)) |
| 587 | return -EPERM; |
| 588 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | switch (msg_type) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | case AUDIT_LIST: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | case AUDIT_ADD: |
| 592 | case AUDIT_DEL: |
Eric Paris | 1890090 | 2013-04-18 19:16:36 -0400 | [diff] [blame] | 593 | return -EOPNOTSUPP; |
| 594 | case AUDIT_GET: |
| 595 | case AUDIT_SET: |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 596 | case AUDIT_GET_FEATURE: |
| 597 | case AUDIT_SET_FEATURE: |
Eric Paris | 1890090 | 2013-04-18 19:16:36 -0400 | [diff] [blame] | 598 | case AUDIT_LIST_RULES: |
| 599 | case AUDIT_ADD_RULE: |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 600 | case AUDIT_DEL_RULE: |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 601 | case AUDIT_SIGNAL_INFO: |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 602 | case AUDIT_TTY_GET: |
| 603 | case AUDIT_TTY_SET: |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 604 | case AUDIT_TRIM: |
| 605 | case AUDIT_MAKE_EQUIV: |
Eric Paris | fd77846 | 2012-01-03 12:25:16 -0500 | [diff] [blame] | 606 | if (!capable(CAP_AUDIT_CONTROL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | err = -EPERM; |
| 608 | break; |
Steve Grubb | 0547410 | 2005-05-21 00:18:37 +0100 | [diff] [blame] | 609 | case AUDIT_USER: |
Robert P. J. Day | 039b6b3 | 2007-05-08 00:29:20 -0700 | [diff] [blame] | 610 | case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: |
| 611 | case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
Eric Paris | fd77846 | 2012-01-03 12:25:16 -0500 | [diff] [blame] | 612 | if (!capable(CAP_AUDIT_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | err = -EPERM; |
| 614 | break; |
| 615 | default: /* bad msg */ |
| 616 | err = -EINVAL; |
| 617 | } |
| 618 | |
| 619 | return err; |
| 620 | } |
| 621 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 622 | static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type) |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 623 | { |
| 624 | int rc = 0; |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 625 | uid_t uid = from_kuid(&init_user_ns, current_uid()); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 626 | |
Tyler Hicks | 0868a5e | 2013-07-25 18:02:55 -0700 | [diff] [blame] | 627 | if (!audit_enabled && msg_type != AUDIT_USER_AVC) { |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 628 | *ab = NULL; |
| 629 | return rc; |
| 630 | } |
| 631 | |
| 632 | *ab = audit_log_start(NULL, GFP_KERNEL, msg_type); |
Kees Cook | 0644ec0 | 2013-01-11 14:32:07 -0800 | [diff] [blame] | 633 | if (unlikely(!*ab)) |
| 634 | return rc; |
Eric Paris | 4d3fb70 | 2013-04-30 09:53:34 -0400 | [diff] [blame] | 635 | audit_log_format(*ab, "pid=%d uid=%u", task_tgid_vnr(current), uid); |
| 636 | audit_log_session_info(*ab); |
Eric Paris | b122c37 | 2013-04-19 15:00:33 -0400 | [diff] [blame] | 637 | audit_log_task_context(*ab); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 638 | |
| 639 | return rc; |
| 640 | } |
| 641 | |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 642 | int is_audit_feature_set(int i) |
| 643 | { |
| 644 | return af.features & AUDIT_FEATURE_TO_MASK(i); |
| 645 | } |
| 646 | |
| 647 | |
| 648 | static int audit_get_feature(struct sk_buff *skb) |
| 649 | { |
| 650 | u32 seq; |
| 651 | |
| 652 | seq = nlmsg_hdr(skb)->nlmsg_seq; |
| 653 | |
| 654 | audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0, |
| 655 | &af, sizeof(af)); |
| 656 | |
| 657 | return 0; |
| 658 | } |
| 659 | |
| 660 | static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature, |
| 661 | u32 old_lock, u32 new_lock, int res) |
| 662 | { |
| 663 | struct audit_buffer *ab; |
| 664 | |
| 665 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE); |
| 666 | audit_log_format(ab, "feature=%s new=%d old=%d old_lock=%d new_lock=%d res=%d", |
| 667 | audit_feature_names[which], !!old_feature, !!new_feature, |
| 668 | !!old_lock, !!new_lock, res); |
| 669 | audit_log_end(ab); |
| 670 | } |
| 671 | |
| 672 | static int audit_set_feature(struct sk_buff *skb) |
| 673 | { |
| 674 | struct audit_features *uaf; |
| 675 | int i; |
| 676 | |
| 677 | BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > sizeof(audit_feature_names)/sizeof(audit_feature_names[0])); |
| 678 | uaf = nlmsg_data(nlmsg_hdr(skb)); |
| 679 | |
| 680 | /* if there is ever a version 2 we should handle that here */ |
| 681 | |
| 682 | for (i = 0; i <= AUDIT_LAST_FEATURE; i++) { |
| 683 | u32 feature = AUDIT_FEATURE_TO_MASK(i); |
| 684 | u32 old_feature, new_feature, old_lock, new_lock; |
| 685 | |
| 686 | /* if we are not changing this feature, move along */ |
| 687 | if (!(feature & uaf->mask)) |
| 688 | continue; |
| 689 | |
| 690 | old_feature = af.features & feature; |
| 691 | new_feature = uaf->features & feature; |
| 692 | new_lock = (uaf->lock | af.lock) & feature; |
| 693 | old_lock = af.lock & feature; |
| 694 | |
| 695 | /* are we changing a locked feature? */ |
| 696 | if ((af.lock & feature) && (new_feature != old_feature)) { |
| 697 | audit_log_feature_change(i, old_feature, new_feature, |
| 698 | old_lock, new_lock, 0); |
| 699 | return -EPERM; |
| 700 | } |
| 701 | } |
| 702 | /* nothing invalid, do the changes */ |
| 703 | for (i = 0; i <= AUDIT_LAST_FEATURE; i++) { |
| 704 | u32 feature = AUDIT_FEATURE_TO_MASK(i); |
| 705 | u32 old_feature, new_feature, old_lock, new_lock; |
| 706 | |
| 707 | /* if we are not changing this feature, move along */ |
| 708 | if (!(feature & uaf->mask)) |
| 709 | continue; |
| 710 | |
| 711 | old_feature = af.features & feature; |
| 712 | new_feature = uaf->features & feature; |
| 713 | old_lock = af.lock & feature; |
| 714 | new_lock = (uaf->lock | af.lock) & feature; |
| 715 | |
| 716 | if (new_feature != old_feature) |
| 717 | audit_log_feature_change(i, old_feature, new_feature, |
| 718 | old_lock, new_lock, 1); |
| 719 | |
| 720 | if (new_feature) |
| 721 | af.features |= feature; |
| 722 | else |
| 723 | af.features &= ~feature; |
| 724 | af.lock |= new_lock; |
| 725 | } |
| 726 | |
| 727 | return 0; |
| 728 | } |
| 729 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 731 | { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 732 | u32 seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | void *data; |
| 734 | struct audit_status *status_get, status_set; |
| 735 | int err; |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 736 | struct audit_buffer *ab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | u16 msg_type = nlh->nlmsg_type; |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 738 | struct audit_sig_info *sig_data; |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 739 | char *ctx = NULL; |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 740 | u32 len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 742 | err = audit_netlink_ok(skb, msg_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | if (err) |
| 744 | return err; |
| 745 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 746 | /* As soon as there's any sign of userspace auditd, |
| 747 | * start kauditd to talk to it */ |
Gao feng | 13f51e1 | 2013-04-29 15:05:14 -0700 | [diff] [blame] | 748 | if (!kauditd_task) { |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 749 | kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd"); |
Gao feng | 13f51e1 | 2013-04-29 15:05:14 -0700 | [diff] [blame] | 750 | if (IS_ERR(kauditd_task)) { |
| 751 | err = PTR_ERR(kauditd_task); |
| 752 | kauditd_task = NULL; |
| 753 | return err; |
| 754 | } |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 755 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | seq = nlh->nlmsg_seq; |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 757 | data = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | |
| 759 | switch (msg_type) { |
| 760 | case AUDIT_GET: |
| 761 | status_set.enabled = audit_enabled; |
| 762 | status_set.failure = audit_failure; |
| 763 | status_set.pid = audit_pid; |
| 764 | status_set.rate_limit = audit_rate_limit; |
| 765 | status_set.backlog_limit = audit_backlog_limit; |
| 766 | status_set.lost = atomic_read(&audit_lost); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 767 | status_set.backlog = skb_queue_len(&audit_skb_queue); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 768 | audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | &status_set, sizeof(status_set)); |
| 770 | break; |
| 771 | case AUDIT_SET: |
| 772 | if (nlh->nlmsg_len < sizeof(struct audit_status)) |
| 773 | return -EINVAL; |
| 774 | status_get = (struct audit_status *)data; |
| 775 | if (status_get->mask & AUDIT_STATUS_ENABLED) { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 776 | err = audit_set_enabled(status_get->enabled); |
zhangxiliang | 20c6aaa | 2008-07-31 10:11:19 +0800 | [diff] [blame] | 777 | if (err < 0) |
| 778 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | } |
| 780 | if (status_get->mask & AUDIT_STATUS_FAILURE) { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 781 | err = audit_set_failure(status_get->failure); |
zhangxiliang | 20c6aaa | 2008-07-31 10:11:19 +0800 | [diff] [blame] | 782 | if (err < 0) |
| 783 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | } |
| 785 | if (status_get->mask & AUDIT_STATUS_PID) { |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 786 | int new_pid = status_get->pid; |
| 787 | |
| 788 | if (audit_enabled != AUDIT_OFF) |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 789 | audit_log_config_change("audit_pid", new_pid, audit_pid, 1); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 790 | audit_pid = new_pid; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 791 | audit_nlk_portid = NETLINK_CB(skb).portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
zhangxiliang | 20c6aaa | 2008-07-31 10:11:19 +0800 | [diff] [blame] | 793 | if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 794 | err = audit_set_rate_limit(status_get->rate_limit); |
zhangxiliang | 20c6aaa | 2008-07-31 10:11:19 +0800 | [diff] [blame] | 795 | if (err < 0) |
| 796 | return err; |
| 797 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT) |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 799 | err = audit_set_backlog_limit(status_get->backlog_limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | break; |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 801 | case AUDIT_GET_FEATURE: |
| 802 | err = audit_get_feature(skb); |
| 803 | if (err) |
| 804 | return err; |
| 805 | break; |
| 806 | case AUDIT_SET_FEATURE: |
| 807 | err = audit_set_feature(skb); |
| 808 | if (err) |
| 809 | return err; |
| 810 | break; |
Steve Grubb | 0547410 | 2005-05-21 00:18:37 +0100 | [diff] [blame] | 811 | case AUDIT_USER: |
Robert P. J. Day | 039b6b3 | 2007-05-08 00:29:20 -0700 | [diff] [blame] | 812 | case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: |
| 813 | case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
David Woodhouse | 4a4cd63 | 2005-06-22 14:56:47 +0100 | [diff] [blame] | 814 | if (!audit_enabled && msg_type != AUDIT_USER_AVC) |
| 815 | return 0; |
David Woodhouse | 0f45aa1 | 2005-06-19 19:35:50 +0100 | [diff] [blame] | 816 | |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 817 | err = audit_filter_user(msg_type); |
David Woodhouse | 4a4cd63 | 2005-06-22 14:56:47 +0100 | [diff] [blame] | 818 | if (err == 1) { |
| 819 | err = 0; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 820 | if (msg_type == AUDIT_USER_TTY) { |
Eric Paris | 152f497 | 2013-04-19 13:56:11 -0400 | [diff] [blame] | 821 | err = tty_audit_push_current(); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 822 | if (err) |
| 823 | break; |
| 824 | } |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 825 | audit_log_common_recv_msg(&ab, msg_type); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 826 | if (msg_type != AUDIT_USER_TTY) |
Richard Guy Briggs | b50eba7 | 2013-09-16 18:20:42 -0400 | [diff] [blame] | 827 | audit_log_format(ab, " msg='%.*s'", |
| 828 | AUDIT_MESSAGE_TEXT_MAX, |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 829 | (char *)data); |
| 830 | else { |
| 831 | int size; |
| 832 | |
Eric Paris | f761610 | 2013-04-11 11:25:00 -0400 | [diff] [blame] | 833 | audit_log_format(ab, " data="); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 834 | size = nlmsg_len(nlh); |
Miloslav Trmac | 55ad2f8 | 2009-03-19 09:52:47 -0400 | [diff] [blame] | 835 | if (size > 0 && |
| 836 | ((unsigned char *)data)[size - 1] == '\0') |
| 837 | size--; |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 838 | audit_log_n_untrustedstring(ab, data, size); |
David Woodhouse | 4a4cd63 | 2005-06-22 14:56:47 +0100 | [diff] [blame] | 839 | } |
Linus Torvalds | aecdc33 | 2012-10-02 13:38:27 -0700 | [diff] [blame] | 840 | audit_set_pid(ab, NETLINK_CB(skb).portid); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 841 | audit_log_end(ab); |
David Woodhouse | 0f45aa1 | 2005-06-19 19:35:50 +0100 | [diff] [blame] | 842 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | break; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 844 | case AUDIT_ADD_RULE: |
| 845 | case AUDIT_DEL_RULE: |
| 846 | if (nlmsg_len(nlh) < sizeof(struct audit_rule_data)) |
| 847 | return -EINVAL; |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 848 | if (audit_enabled == AUDIT_LOCKED) { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 849 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
| 850 | audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 851 | audit_log_end(ab); |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 852 | return -EPERM; |
| 853 | } |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 854 | /* fallthrough */ |
| 855 | case AUDIT_LIST_RULES: |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 856 | err = audit_receive_filter(msg_type, NETLINK_CB(skb).portid, |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 857 | seq, data, nlmsg_len(nlh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 859 | case AUDIT_TRIM: |
| 860 | audit_trim_trees(); |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 861 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 862 | audit_log_format(ab, " op=trim res=1"); |
| 863 | audit_log_end(ab); |
| 864 | break; |
| 865 | case AUDIT_MAKE_EQUIV: { |
| 866 | void *bufp = data; |
| 867 | u32 sizes[2]; |
Harvey Harrison | 7719e43 | 2008-04-27 02:39:56 -0700 | [diff] [blame] | 868 | size_t msglen = nlmsg_len(nlh); |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 869 | char *old, *new; |
| 870 | |
| 871 | err = -EINVAL; |
Harvey Harrison | 7719e43 | 2008-04-27 02:39:56 -0700 | [diff] [blame] | 872 | if (msglen < 2 * sizeof(u32)) |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 873 | break; |
| 874 | memcpy(sizes, bufp, 2 * sizeof(u32)); |
| 875 | bufp += 2 * sizeof(u32); |
Harvey Harrison | 7719e43 | 2008-04-27 02:39:56 -0700 | [diff] [blame] | 876 | msglen -= 2 * sizeof(u32); |
| 877 | old = audit_unpack_string(&bufp, &msglen, sizes[0]); |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 878 | if (IS_ERR(old)) { |
| 879 | err = PTR_ERR(old); |
| 880 | break; |
| 881 | } |
Harvey Harrison | 7719e43 | 2008-04-27 02:39:56 -0700 | [diff] [blame] | 882 | new = audit_unpack_string(&bufp, &msglen, sizes[1]); |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 883 | if (IS_ERR(new)) { |
| 884 | err = PTR_ERR(new); |
| 885 | kfree(old); |
| 886 | break; |
| 887 | } |
| 888 | /* OK, here comes... */ |
| 889 | err = audit_tag_tree(old, new); |
| 890 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 891 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 892 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 893 | audit_log_format(ab, " op=make_equiv old="); |
| 894 | audit_log_untrustedstring(ab, old); |
| 895 | audit_log_format(ab, " new="); |
| 896 | audit_log_untrustedstring(ab, new); |
| 897 | audit_log_format(ab, " res=%d", !err); |
| 898 | audit_log_end(ab); |
| 899 | kfree(old); |
| 900 | kfree(new); |
| 901 | break; |
| 902 | } |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 903 | case AUDIT_SIGNAL_INFO: |
Eric Paris | 939cbf2 | 2009-09-23 13:46:00 -0400 | [diff] [blame] | 904 | len = 0; |
| 905 | if (audit_sig_sid) { |
| 906 | err = security_secid_to_secctx(audit_sig_sid, &ctx, &len); |
| 907 | if (err) |
| 908 | return err; |
| 909 | } |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 910 | sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL); |
| 911 | if (!sig_data) { |
Eric Paris | 939cbf2 | 2009-09-23 13:46:00 -0400 | [diff] [blame] | 912 | if (audit_sig_sid) |
| 913 | security_release_secctx(ctx, len); |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 914 | return -ENOMEM; |
| 915 | } |
Eric W. Biederman | cca080d | 2012-02-07 16:53:48 -0800 | [diff] [blame] | 916 | sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid); |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 917 | sig_data->pid = audit_sig_pid; |
Eric Paris | 939cbf2 | 2009-09-23 13:46:00 -0400 | [diff] [blame] | 918 | if (audit_sig_sid) { |
| 919 | memcpy(sig_data->ctx, ctx, len); |
| 920 | security_release_secctx(ctx, len); |
| 921 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 922 | audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_SIGNAL_INFO, |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 923 | 0, 0, sig_data, sizeof(*sig_data) + len); |
| 924 | kfree(sig_data); |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 925 | break; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 926 | case AUDIT_TTY_GET: { |
| 927 | struct audit_tty_status s; |
Eric W. Biederman | 8aa14b6 | 2012-09-10 23:43:14 -0700 | [diff] [blame] | 928 | struct task_struct *tsk = current; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 929 | |
Eric Paris | 7173c54 | 2013-04-30 11:28:04 -0400 | [diff] [blame] | 930 | spin_lock(&tsk->sighand->siglock); |
Eric W. Biederman | 8aa14b6 | 2012-09-10 23:43:14 -0700 | [diff] [blame] | 931 | s.enabled = tsk->signal->audit_tty != 0; |
Richard Guy Briggs | 46e959e | 2013-05-03 14:03:50 -0400 | [diff] [blame] | 932 | s.log_passwd = tsk->signal->audit_tty_log_passwd; |
Eric Paris | 7173c54 | 2013-04-30 11:28:04 -0400 | [diff] [blame] | 933 | spin_unlock(&tsk->sighand->siglock); |
Thomas Gleixner | 2070320 | 2009-12-09 14:19:35 +0000 | [diff] [blame] | 934 | |
Linus Torvalds | aecdc33 | 2012-10-02 13:38:27 -0700 | [diff] [blame] | 935 | audit_send_reply(NETLINK_CB(skb).portid, seq, |
Eric W. Biederman | 8aa14b6 | 2012-09-10 23:43:14 -0700 | [diff] [blame] | 936 | AUDIT_TTY_GET, 0, 0, &s, sizeof(s)); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 937 | break; |
| 938 | } |
| 939 | case AUDIT_TTY_SET: { |
Richard Guy Briggs | 46e959e | 2013-05-03 14:03:50 -0400 | [diff] [blame] | 940 | struct audit_tty_status s; |
Eric W. Biederman | 8aa14b6 | 2012-09-10 23:43:14 -0700 | [diff] [blame] | 941 | struct task_struct *tsk = current; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 942 | |
Richard Guy Briggs | 46e959e | 2013-05-03 14:03:50 -0400 | [diff] [blame] | 943 | memset(&s, 0, sizeof(s)); |
| 944 | /* guard against past and future API changes */ |
| 945 | memcpy(&s, data, min(sizeof(s), (size_t)nlh->nlmsg_len)); |
| 946 | if ((s.enabled != 0 && s.enabled != 1) || |
| 947 | (s.log_passwd != 0 && s.log_passwd != 1)) |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 948 | return -EINVAL; |
Eric W. Biederman | 8aa14b6 | 2012-09-10 23:43:14 -0700 | [diff] [blame] | 949 | |
Eric Paris | 7173c54 | 2013-04-30 11:28:04 -0400 | [diff] [blame] | 950 | spin_lock(&tsk->sighand->siglock); |
Richard Guy Briggs | 46e959e | 2013-05-03 14:03:50 -0400 | [diff] [blame] | 951 | tsk->signal->audit_tty = s.enabled; |
| 952 | tsk->signal->audit_tty_log_passwd = s.log_passwd; |
Eric Paris | 7173c54 | 2013-04-30 11:28:04 -0400 | [diff] [blame] | 953 | spin_unlock(&tsk->sighand->siglock); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 954 | break; |
| 955 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | default: |
| 957 | err = -EINVAL; |
| 958 | break; |
| 959 | } |
| 960 | |
| 961 | return err < 0 ? err : 0; |
| 962 | } |
| 963 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 964 | /* |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 965 | * Get message from skb. Each message is processed by audit_receive_msg. |
| 966 | * Malformed skbs with wrong length are discarded silently. |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 967 | */ |
Herbert Xu | 2a0a6eb | 2005-05-03 14:55:09 -0700 | [diff] [blame] | 968 | static void audit_receive_skb(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | { |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 970 | struct nlmsghdr *nlh; |
| 971 | /* |
Hong zhi guo | 9419121 | 2013-03-27 06:49:06 +0000 | [diff] [blame] | 972 | * len MUST be signed for nlmsg_next to be able to dec it below 0 |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 973 | * if the nlmsg_len was not aligned |
| 974 | */ |
| 975 | int len; |
| 976 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 978 | nlh = nlmsg_hdr(skb); |
| 979 | len = skb->len; |
| 980 | |
Hong zhi guo | 9419121 | 2013-03-27 06:49:06 +0000 | [diff] [blame] | 981 | while (nlmsg_ok(nlh, len)) { |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 982 | err = audit_receive_msg(skb, nlh); |
| 983 | /* if err or if this message says it wants a response */ |
| 984 | if (err || (nlh->nlmsg_flags & NLM_F_ACK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | netlink_ack(skb, nlh, err); |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 986 | |
Alexandru Copot | 2851da5 | 2013-03-28 23:31:29 +0200 | [diff] [blame] | 987 | nlh = nlmsg_next(nlh, &len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | } |
| 990 | |
| 991 | /* Receive messages from netlink socket. */ |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 992 | static void audit_receive(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | { |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 994 | mutex_lock(&audit_cmd_mutex); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 995 | audit_receive_skb(skb); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 996 | mutex_unlock(&audit_cmd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | } |
| 998 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | /* Initialize audit support at boot time. */ |
| 1000 | static int __init audit_init(void) |
| 1001 | { |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1002 | int i; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1003 | struct netlink_kernel_cfg cfg = { |
| 1004 | .input = audit_receive, |
| 1005 | }; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1006 | |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1007 | if (audit_initialized == AUDIT_DISABLED) |
| 1008 | return 0; |
| 1009 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | printk(KERN_INFO "audit: initializing netlink socket (%s)\n", |
| 1011 | audit_default ? "enabled" : "disabled"); |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 1012 | audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, &cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | if (!audit_sock) |
| 1014 | audit_panic("cannot initialize netlink socket"); |
Amy Griffis | 71e1c78 | 2006-03-06 22:40:05 -0500 | [diff] [blame] | 1015 | else |
| 1016 | audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1018 | skb_queue_head_init(&audit_skb_queue); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 1019 | skb_queue_head_init(&audit_skb_hold_queue); |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1020 | audit_initialized = AUDIT_INITIALIZED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | audit_enabled = audit_default; |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 1022 | audit_ever_enabled |= !!audit_default; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1023 | |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1024 | audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized"); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1025 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1026 | for (i = 0; i < AUDIT_INODE_BUCKETS; i++) |
| 1027 | INIT_LIST_HEAD(&audit_inode_hash[i]); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1028 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | return 0; |
| 1030 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | __initcall(audit_init); |
| 1032 | |
| 1033 | /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */ |
| 1034 | static int __init audit_enable(char *str) |
| 1035 | { |
| 1036 | audit_default = !!simple_strtol(str, NULL, 0); |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1037 | if (!audit_default) |
| 1038 | audit_initialized = AUDIT_DISABLED; |
| 1039 | |
| 1040 | printk(KERN_INFO "audit: %s", audit_default ? "enabled" : "disabled"); |
| 1041 | |
| 1042 | if (audit_initialized == AUDIT_INITIALIZED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | audit_enabled = audit_default; |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 1044 | audit_ever_enabled |= !!audit_default; |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1045 | } else if (audit_initialized == AUDIT_UNINITIALIZED) { |
| 1046 | printk(" (after initialization)"); |
| 1047 | } else { |
| 1048 | printk(" (until reboot)"); |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 1049 | } |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1050 | printk("\n"); |
| 1051 | |
OGAWA Hirofumi | 9b41046 | 2006-03-31 02:30:33 -0800 | [diff] [blame] | 1052 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | } |
| 1054 | |
| 1055 | __setup("audit=", audit_enable); |
| 1056 | |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1057 | static void audit_buffer_free(struct audit_buffer *ab) |
| 1058 | { |
| 1059 | unsigned long flags; |
| 1060 | |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1061 | if (!ab) |
| 1062 | return; |
| 1063 | |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1064 | if (ab->skb) |
| 1065 | kfree_skb(ab->skb); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1066 | |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1067 | spin_lock_irqsave(&audit_freelist_lock, flags); |
Serge E. Hallyn | 5d136a0 | 2006-04-27 16:45:14 -0500 | [diff] [blame] | 1068 | if (audit_freelist_count > AUDIT_MAXFREE) |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1069 | kfree(ab); |
Serge E. Hallyn | 5d136a0 | 2006-04-27 16:45:14 -0500 | [diff] [blame] | 1070 | else { |
| 1071 | audit_freelist_count++; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1072 | list_add(&ab->list, &audit_freelist); |
Serge E. Hallyn | 5d136a0 | 2006-04-27 16:45:14 -0500 | [diff] [blame] | 1073 | } |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1074 | spin_unlock_irqrestore(&audit_freelist_lock, flags); |
| 1075 | } |
| 1076 | |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 1077 | static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1078 | gfp_t gfp_mask, int type) |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1079 | { |
| 1080 | unsigned long flags; |
| 1081 | struct audit_buffer *ab = NULL; |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 1082 | struct nlmsghdr *nlh; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1083 | |
| 1084 | spin_lock_irqsave(&audit_freelist_lock, flags); |
| 1085 | if (!list_empty(&audit_freelist)) { |
| 1086 | ab = list_entry(audit_freelist.next, |
| 1087 | struct audit_buffer, list); |
| 1088 | list_del(&ab->list); |
| 1089 | --audit_freelist_count; |
| 1090 | } |
| 1091 | spin_unlock_irqrestore(&audit_freelist_lock, flags); |
| 1092 | |
| 1093 | if (!ab) { |
David Woodhouse | 4332bdd | 2005-05-06 15:59:57 +0100 | [diff] [blame] | 1094 | ab = kmalloc(sizeof(*ab), gfp_mask); |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1095 | if (!ab) |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1096 | goto err; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1097 | } |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1098 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1099 | ab->ctx = ctx; |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1100 | ab->gfp_mask = gfp_mask; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1101 | |
| 1102 | ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask); |
| 1103 | if (!ab->skb) |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 1104 | goto err; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1105 | |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 1106 | nlh = nlmsg_put(ab->skb, 0, 0, type, 0, 0); |
| 1107 | if (!nlh) |
| 1108 | goto out_kfree_skb; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1109 | |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1110 | return ab; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1111 | |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 1112 | out_kfree_skb: |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1113 | kfree_skb(ab->skb); |
| 1114 | ab->skb = NULL; |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1115 | err: |
| 1116 | audit_buffer_free(ab); |
| 1117 | return NULL; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1118 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1120 | /** |
| 1121 | * audit_serial - compute a serial number for the audit record |
| 1122 | * |
| 1123 | * Compute a serial number for the audit record. Audit records are |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1124 | * written to user-space as soon as they are generated, so a complete |
| 1125 | * audit record may be written in several pieces. The timestamp of the |
| 1126 | * record and this serial number are used by the user-space tools to |
| 1127 | * determine which pieces belong to the same audit record. The |
| 1128 | * (timestamp,serial) tuple is unique for each syscall and is live from |
| 1129 | * syscall entry to syscall exit. |
| 1130 | * |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1131 | * NOTE: Another possibility is to store the formatted records off the |
| 1132 | * audit context (for those records that have a context), and emit them |
| 1133 | * all at syscall exit. However, this could delay the reporting of |
| 1134 | * significant errors until syscall exit (or never, if the system |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1135 | * halts). |
| 1136 | */ |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1137 | unsigned int audit_serial(void) |
| 1138 | { |
Ingo Molnar | 34af946 | 2006-06-27 02:53:55 -0700 | [diff] [blame] | 1139 | static DEFINE_SPINLOCK(serial_lock); |
David Woodhouse | d5b454f | 2005-07-15 12:56:03 +0100 | [diff] [blame] | 1140 | static unsigned int serial = 0; |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1141 | |
David Woodhouse | d5b454f | 2005-07-15 12:56:03 +0100 | [diff] [blame] | 1142 | unsigned long flags; |
| 1143 | unsigned int ret; |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1144 | |
David Woodhouse | d5b454f | 2005-07-15 12:56:03 +0100 | [diff] [blame] | 1145 | spin_lock_irqsave(&serial_lock, flags); |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1146 | do { |
David Woodhouse | ce625a8 | 2005-07-18 14:24:46 -0400 | [diff] [blame] | 1147 | ret = ++serial; |
| 1148 | } while (unlikely(!ret)); |
David Woodhouse | d5b454f | 2005-07-15 12:56:03 +0100 | [diff] [blame] | 1149 | spin_unlock_irqrestore(&serial_lock, flags); |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1150 | |
David Woodhouse | d5b454f | 2005-07-15 12:56:03 +0100 | [diff] [blame] | 1151 | return ret; |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1152 | } |
| 1153 | |
Daniel Walker | 5600b89 | 2007-10-18 03:06:10 -0700 | [diff] [blame] | 1154 | static inline void audit_get_stamp(struct audit_context *ctx, |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1155 | struct timespec *t, unsigned int *serial) |
| 1156 | { |
Al Viro | 48887e6 | 2008-12-06 01:05:50 -0500 | [diff] [blame] | 1157 | if (!ctx || !auditsc_get_stamp(ctx, t, serial)) { |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1158 | *t = CURRENT_TIME; |
| 1159 | *serial = audit_serial(); |
| 1160 | } |
| 1161 | } |
| 1162 | |
Andrew Morton | 8291991 | 2013-01-11 14:32:11 -0800 | [diff] [blame] | 1163 | /* |
| 1164 | * Wait for auditd to drain the queue a little |
| 1165 | */ |
| 1166 | static void wait_for_auditd(unsigned long sleep_time) |
| 1167 | { |
| 1168 | DECLARE_WAITQUEUE(wait, current); |
Oleg Nesterov | f000cfd | 2013-06-12 14:04:46 -0700 | [diff] [blame] | 1169 | set_current_state(TASK_UNINTERRUPTIBLE); |
Andrew Morton | 8291991 | 2013-01-11 14:32:11 -0800 | [diff] [blame] | 1170 | add_wait_queue(&audit_backlog_wait, &wait); |
| 1171 | |
| 1172 | if (audit_backlog_limit && |
| 1173 | skb_queue_len(&audit_skb_queue) > audit_backlog_limit) |
| 1174 | schedule_timeout(sleep_time); |
| 1175 | |
| 1176 | __set_current_state(TASK_RUNNING); |
| 1177 | remove_wait_queue(&audit_backlog_wait, &wait); |
| 1178 | } |
| 1179 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1180 | /** |
| 1181 | * audit_log_start - obtain an audit buffer |
| 1182 | * @ctx: audit_context (may be NULL) |
| 1183 | * @gfp_mask: type of allocation |
| 1184 | * @type: audit message type |
| 1185 | * |
| 1186 | * Returns audit_buffer pointer on success or NULL on error. |
| 1187 | * |
| 1188 | * Obtain an audit buffer. This routine does locking to obtain the |
| 1189 | * audit buffer, but then no locking is required for calls to |
| 1190 | * audit_log_*format. If the task (ctx) is a task that is currently in a |
| 1191 | * syscall, then the syscall is marked as auditable and an audit record |
| 1192 | * will be written at syscall exit. If there is no associated task, then |
| 1193 | * task context (ctx) should be NULL. |
| 1194 | */ |
Al Viro | 9796fdd | 2005-10-21 03:22:03 -0400 | [diff] [blame] | 1195 | struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1196 | int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | { |
| 1198 | struct audit_buffer *ab = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | struct timespec t; |
Andrew Morton | ef00be0 | 2008-01-10 11:02:39 -0800 | [diff] [blame] | 1200 | unsigned int uninitialized_var(serial); |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1201 | int reserve; |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 1202 | unsigned long timeout_start = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1204 | if (audit_initialized != AUDIT_INITIALIZED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | return NULL; |
| 1206 | |
Dustin Kirkland | c8edc80 | 2005-11-03 16:12:36 +0000 | [diff] [blame] | 1207 | if (unlikely(audit_filter_type(type))) |
| 1208 | return NULL; |
| 1209 | |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1210 | if (gfp_mask & __GFP_WAIT) |
| 1211 | reserve = 0; |
| 1212 | else |
Daniel Walker | 5600b89 | 2007-10-18 03:06:10 -0700 | [diff] [blame] | 1213 | reserve = 5; /* Allow atomic callers to go up to five |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1214 | entries over the normal backlog limit */ |
| 1215 | |
| 1216 | while (audit_backlog_limit |
| 1217 | && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) { |
Andrew Morton | 8291991 | 2013-01-11 14:32:11 -0800 | [diff] [blame] | 1218 | if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) { |
| 1219 | unsigned long sleep_time; |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 1220 | |
Andrew Morton | 8291991 | 2013-01-11 14:32:11 -0800 | [diff] [blame] | 1221 | sleep_time = timeout_start + audit_backlog_wait_time - |
| 1222 | jiffies; |
| 1223 | if ((long)sleep_time > 0) |
| 1224 | wait_for_auditd(sleep_time); |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 1225 | continue; |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1226 | } |
Eric Paris | 320f1b1 | 2008-01-23 22:55:05 -0500 | [diff] [blame] | 1227 | if (audit_rate_check() && printk_ratelimit()) |
David Woodhouse | fb19b4c | 2005-05-19 14:55:56 +0100 | [diff] [blame] | 1228 | printk(KERN_WARNING |
| 1229 | "audit: audit_backlog=%d > " |
| 1230 | "audit_backlog_limit=%d\n", |
| 1231 | skb_queue_len(&audit_skb_queue), |
| 1232 | audit_backlog_limit); |
| 1233 | audit_log_lost("backlog limit exceeded"); |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 1234 | audit_backlog_wait_time = audit_backlog_wait_overflow; |
| 1235 | wake_up(&audit_backlog_wait); |
David Woodhouse | fb19b4c | 2005-05-19 14:55:56 +0100 | [diff] [blame] | 1236 | return NULL; |
| 1237 | } |
| 1238 | |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1239 | ab = audit_buffer_alloc(ctx, gfp_mask, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | if (!ab) { |
| 1241 | audit_log_lost("out of memory in audit_log_start"); |
| 1242 | return NULL; |
| 1243 | } |
| 1244 | |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1245 | audit_get_stamp(ab->ctx, &t, &serial); |
Chris Wright | 197c69c | 2005-05-11 10:54:05 +0100 | [diff] [blame] | 1246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | audit_log_format(ab, "audit(%lu.%03lu:%u): ", |
| 1248 | t.tv_sec, t.tv_nsec/1000000, serial); |
| 1249 | return ab; |
| 1250 | } |
| 1251 | |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1252 | /** |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1253 | * audit_expand - expand skb in the audit buffer |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1254 | * @ab: audit_buffer |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1255 | * @extra: space to add at tail of the skb |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1256 | * |
| 1257 | * Returns 0 (no space) on failed expansion, or available space if |
| 1258 | * successful. |
| 1259 | */ |
David Woodhouse | e3b926b | 2005-05-10 18:56:08 +0100 | [diff] [blame] | 1260 | static inline int audit_expand(struct audit_buffer *ab, int extra) |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1261 | { |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1262 | struct sk_buff *skb = ab->skb; |
Herbert Xu | 406a1d8 | 2008-01-28 20:47:09 -0800 | [diff] [blame] | 1263 | int oldtail = skb_tailroom(skb); |
| 1264 | int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask); |
| 1265 | int newtail = skb_tailroom(skb); |
| 1266 | |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1267 | if (ret < 0) { |
| 1268 | audit_log_lost("out of memory in audit_expand"); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1269 | return 0; |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1270 | } |
Herbert Xu | 406a1d8 | 2008-01-28 20:47:09 -0800 | [diff] [blame] | 1271 | |
| 1272 | skb->truesize += newtail - oldtail; |
| 1273 | return newtail; |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1274 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1276 | /* |
| 1277 | * Format an audit message into the audit buffer. If there isn't enough |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | * room in the audit buffer, more room will be allocated and vsnprint |
| 1279 | * will be called a second time. Currently, we assume that a printk |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1280 | * can't format message larger than 1024 bytes, so we don't either. |
| 1281 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | static void audit_log_vformat(struct audit_buffer *ab, const char *fmt, |
| 1283 | va_list args) |
| 1284 | { |
| 1285 | int len, avail; |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1286 | struct sk_buff *skb; |
David Woodhouse | eecb0a7 | 2005-05-10 18:58:51 +0100 | [diff] [blame] | 1287 | va_list args2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | |
| 1289 | if (!ab) |
| 1290 | return; |
| 1291 | |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1292 | BUG_ON(!ab->skb); |
| 1293 | skb = ab->skb; |
| 1294 | avail = skb_tailroom(skb); |
| 1295 | if (avail == 0) { |
David Woodhouse | e3b926b | 2005-05-10 18:56:08 +0100 | [diff] [blame] | 1296 | avail = audit_expand(ab, AUDIT_BUFSIZ); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1297 | if (!avail) |
| 1298 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | } |
David Woodhouse | eecb0a7 | 2005-05-10 18:58:51 +0100 | [diff] [blame] | 1300 | va_copy(args2, args); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1301 | len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | if (len >= avail) { |
| 1303 | /* The printk buffer is 1024 bytes long, so if we get |
| 1304 | * here and AUDIT_BUFSIZ is at least 1024, then we can |
| 1305 | * log everything that printk could have logged. */ |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1306 | avail = audit_expand(ab, |
| 1307 | max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail)); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1308 | if (!avail) |
Jesper Juhl | a0e86bd | 2012-01-08 22:44:29 +0100 | [diff] [blame] | 1309 | goto out_va_end; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1310 | len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | } |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1312 | if (len > 0) |
| 1313 | skb_put(skb, len); |
Jesper Juhl | a0e86bd | 2012-01-08 22:44:29 +0100 | [diff] [blame] | 1314 | out_va_end: |
| 1315 | va_end(args2); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1316 | out: |
| 1317 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | } |
| 1319 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1320 | /** |
| 1321 | * audit_log_format - format a message into the audit buffer. |
| 1322 | * @ab: audit_buffer |
| 1323 | * @fmt: format string |
| 1324 | * @...: optional parameters matching @fmt string |
| 1325 | * |
| 1326 | * All the work is done in audit_log_vformat. |
| 1327 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | void audit_log_format(struct audit_buffer *ab, const char *fmt, ...) |
| 1329 | { |
| 1330 | va_list args; |
| 1331 | |
| 1332 | if (!ab) |
| 1333 | return; |
| 1334 | va_start(args, fmt); |
| 1335 | audit_log_vformat(ab, fmt, args); |
| 1336 | va_end(args); |
| 1337 | } |
| 1338 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1339 | /** |
| 1340 | * audit_log_hex - convert a buffer to hex and append it to the audit skb |
| 1341 | * @ab: the audit_buffer |
| 1342 | * @buf: buffer to convert to hex |
| 1343 | * @len: length of @buf to be converted |
| 1344 | * |
| 1345 | * No return value; failure to expand is silently ignored. |
| 1346 | * |
| 1347 | * This function will take the passed buf and convert it into a string of |
| 1348 | * ascii hex digits. The new string is placed onto the skb. |
| 1349 | */ |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1350 | void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf, |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1351 | size_t len) |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1352 | { |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1353 | int i, avail, new_len; |
| 1354 | unsigned char *ptr; |
| 1355 | struct sk_buff *skb; |
| 1356 | static const unsigned char *hex = "0123456789ABCDEF"; |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1357 | |
Amy Griffis | 8ef2d30 | 2006-09-07 17:03:02 -0400 | [diff] [blame] | 1358 | if (!ab) |
| 1359 | return; |
| 1360 | |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1361 | BUG_ON(!ab->skb); |
| 1362 | skb = ab->skb; |
| 1363 | avail = skb_tailroom(skb); |
| 1364 | new_len = len<<1; |
| 1365 | if (new_len >= avail) { |
| 1366 | /* Round the buffer request up to the next multiple */ |
| 1367 | new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1); |
| 1368 | avail = audit_expand(ab, new_len); |
| 1369 | if (!avail) |
| 1370 | return; |
| 1371 | } |
| 1372 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1373 | ptr = skb_tail_pointer(skb); |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1374 | for (i=0; i<len; i++) { |
| 1375 | *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */ |
| 1376 | *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */ |
| 1377 | } |
| 1378 | *ptr = 0; |
| 1379 | skb_put(skb, len << 1); /* new string is twice the old string */ |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1380 | } |
| 1381 | |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1382 | /* |
| 1383 | * Format a string of no more than slen characters into the audit buffer, |
| 1384 | * enclosed in quote marks. |
| 1385 | */ |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1386 | void audit_log_n_string(struct audit_buffer *ab, const char *string, |
| 1387 | size_t slen) |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1388 | { |
| 1389 | int avail, new_len; |
| 1390 | unsigned char *ptr; |
| 1391 | struct sk_buff *skb; |
| 1392 | |
Amy Griffis | 8ef2d30 | 2006-09-07 17:03:02 -0400 | [diff] [blame] | 1393 | if (!ab) |
| 1394 | return; |
| 1395 | |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1396 | BUG_ON(!ab->skb); |
| 1397 | skb = ab->skb; |
| 1398 | avail = skb_tailroom(skb); |
| 1399 | new_len = slen + 3; /* enclosing quotes + null terminator */ |
| 1400 | if (new_len > avail) { |
| 1401 | avail = audit_expand(ab, new_len); |
| 1402 | if (!avail) |
| 1403 | return; |
| 1404 | } |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1405 | ptr = skb_tail_pointer(skb); |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1406 | *ptr++ = '"'; |
| 1407 | memcpy(ptr, string, slen); |
| 1408 | ptr += slen; |
| 1409 | *ptr++ = '"'; |
| 1410 | *ptr = 0; |
| 1411 | skb_put(skb, slen + 2); /* don't include null terminator */ |
| 1412 | } |
| 1413 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1414 | /** |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1415 | * audit_string_contains_control - does a string need to be logged in hex |
Dave Jones | f706d5d | 2008-03-28 14:15:56 -0700 | [diff] [blame] | 1416 | * @string: string to be checked |
| 1417 | * @len: max length of the string to check |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1418 | */ |
| 1419 | int audit_string_contains_control(const char *string, size_t len) |
| 1420 | { |
| 1421 | const unsigned char *p; |
Miloslav Trmac | b3897f5 | 2009-03-19 09:48:27 -0400 | [diff] [blame] | 1422 | for (p = string; p < (const unsigned char *)string + len; p++) { |
Vesa-Matti J Kari | 1d6c964 | 2008-07-23 00:06:13 +0300 | [diff] [blame] | 1423 | if (*p == '"' || *p < 0x21 || *p > 0x7e) |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1424 | return 1; |
| 1425 | } |
| 1426 | return 0; |
| 1427 | } |
| 1428 | |
| 1429 | /** |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1430 | * audit_log_n_untrustedstring - log a string that may contain random characters |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1431 | * @ab: audit_buffer |
Dave Jones | f706d5d | 2008-03-28 14:15:56 -0700 | [diff] [blame] | 1432 | * @len: length of string (not including trailing null) |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1433 | * @string: string to be logged |
| 1434 | * |
| 1435 | * This code will escape a string that is passed to it if the string |
| 1436 | * contains a control character, unprintable character, double quote mark, |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1437 | * or a space. Unescaped strings will start and end with a double quote mark. |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1438 | * Strings that are escaped are printed in hex (2 digits per char). |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1439 | * |
| 1440 | * The caller specifies the number of characters in the string to log, which may |
| 1441 | * or may not be the entire string. |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1442 | */ |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1443 | void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string, |
| 1444 | size_t len) |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1445 | { |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1446 | if (audit_string_contains_control(string, len)) |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1447 | audit_log_n_hex(ab, string, len); |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1448 | else |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1449 | audit_log_n_string(ab, string, len); |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1450 | } |
| 1451 | |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1452 | /** |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1453 | * audit_log_untrustedstring - log a string that may contain random characters |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1454 | * @ab: audit_buffer |
| 1455 | * @string: string to be logged |
| 1456 | * |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1457 | * Same as audit_log_n_untrustedstring(), except that strlen is used to |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1458 | * determine string length. |
| 1459 | */ |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1460 | void audit_log_untrustedstring(struct audit_buffer *ab, const char *string) |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1461 | { |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1462 | audit_log_n_untrustedstring(ab, string, strlen(string)); |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1463 | } |
| 1464 | |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1465 | /* This is a helper-function to print the escaped d_path */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | void audit_log_d_path(struct audit_buffer *ab, const char *prefix, |
Al Viro | 66b3fad | 2012-03-14 21:48:20 -0400 | [diff] [blame] | 1467 | const struct path *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | { |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1469 | char *p, *pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1471 | if (prefix) |
Kees Cook | c158a35 | 2012-01-06 14:07:10 -0800 | [diff] [blame] | 1472 | audit_log_format(ab, "%s", prefix); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1474 | /* We will allow 11 spaces for ' (deleted)' to be appended */ |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1475 | pathname = kmalloc(PATH_MAX+11, ab->gfp_mask); |
| 1476 | if (!pathname) { |
Eric Paris | def5754 | 2009-03-10 18:00:14 -0400 | [diff] [blame] | 1477 | audit_log_string(ab, "<no_memory>"); |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1478 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | } |
Jan Blunck | cf28b48 | 2008-02-14 19:38:44 -0800 | [diff] [blame] | 1480 | p = d_path(path, pathname, PATH_MAX+11); |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1481 | if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */ |
| 1482 | /* FIXME: can we save some information here? */ |
Eric Paris | def5754 | 2009-03-10 18:00:14 -0400 | [diff] [blame] | 1483 | audit_log_string(ab, "<too_long>"); |
Daniel Walker | 5600b89 | 2007-10-18 03:06:10 -0700 | [diff] [blame] | 1484 | } else |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1485 | audit_log_untrustedstring(ab, p); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1486 | kfree(pathname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | } |
| 1488 | |
Eric Paris | 4d3fb70 | 2013-04-30 09:53:34 -0400 | [diff] [blame] | 1489 | void audit_log_session_info(struct audit_buffer *ab) |
| 1490 | { |
| 1491 | u32 sessionid = audit_get_sessionid(current); |
| 1492 | uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current)); |
| 1493 | |
Richard Guy Briggs | b8f89ca | 2013-09-18 11:17:43 -0400 | [diff] [blame] | 1494 | audit_log_format(ab, " auid=%u ses=%u", auid, sessionid); |
Eric Paris | 4d3fb70 | 2013-04-30 09:53:34 -0400 | [diff] [blame] | 1495 | } |
| 1496 | |
Eric Paris | 9d96098 | 2009-06-11 14:31:37 -0400 | [diff] [blame] | 1497 | void audit_log_key(struct audit_buffer *ab, char *key) |
| 1498 | { |
| 1499 | audit_log_format(ab, " key="); |
| 1500 | if (key) |
| 1501 | audit_log_untrustedstring(ab, key); |
| 1502 | else |
| 1503 | audit_log_format(ab, "(null)"); |
| 1504 | } |
| 1505 | |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1506 | void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap) |
| 1507 | { |
| 1508 | int i; |
| 1509 | |
| 1510 | audit_log_format(ab, " %s=", prefix); |
| 1511 | CAP_FOR_EACH_U32(i) { |
| 1512 | audit_log_format(ab, "%08x", |
| 1513 | cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]); |
| 1514 | } |
| 1515 | } |
| 1516 | |
| 1517 | void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) |
| 1518 | { |
| 1519 | kernel_cap_t *perm = &name->fcap.permitted; |
| 1520 | kernel_cap_t *inh = &name->fcap.inheritable; |
| 1521 | int log = 0; |
| 1522 | |
| 1523 | if (!cap_isclear(*perm)) { |
| 1524 | audit_log_cap(ab, "cap_fp", perm); |
| 1525 | log = 1; |
| 1526 | } |
| 1527 | if (!cap_isclear(*inh)) { |
| 1528 | audit_log_cap(ab, "cap_fi", inh); |
| 1529 | log = 1; |
| 1530 | } |
| 1531 | |
| 1532 | if (log) |
| 1533 | audit_log_format(ab, " cap_fe=%d cap_fver=%x", |
| 1534 | name->fcap.fE, name->fcap_ver); |
| 1535 | } |
| 1536 | |
| 1537 | static inline int audit_copy_fcaps(struct audit_names *name, |
| 1538 | const struct dentry *dentry) |
| 1539 | { |
| 1540 | struct cpu_vfs_cap_data caps; |
| 1541 | int rc; |
| 1542 | |
| 1543 | if (!dentry) |
| 1544 | return 0; |
| 1545 | |
| 1546 | rc = get_vfs_caps_from_disk(dentry, &caps); |
| 1547 | if (rc) |
| 1548 | return rc; |
| 1549 | |
| 1550 | name->fcap.permitted = caps.permitted; |
| 1551 | name->fcap.inheritable = caps.inheritable; |
| 1552 | name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); |
| 1553 | name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> |
| 1554 | VFS_CAP_REVISION_SHIFT; |
| 1555 | |
| 1556 | return 0; |
| 1557 | } |
| 1558 | |
| 1559 | /* Copy inode data into an audit_names. */ |
| 1560 | void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, |
| 1561 | const struct inode *inode) |
| 1562 | { |
| 1563 | name->ino = inode->i_ino; |
| 1564 | name->dev = inode->i_sb->s_dev; |
| 1565 | name->mode = inode->i_mode; |
| 1566 | name->uid = inode->i_uid; |
| 1567 | name->gid = inode->i_gid; |
| 1568 | name->rdev = inode->i_rdev; |
| 1569 | security_inode_getsecid(inode, &name->osid); |
| 1570 | audit_copy_fcaps(name, dentry); |
| 1571 | } |
| 1572 | |
| 1573 | /** |
| 1574 | * audit_log_name - produce AUDIT_PATH record from struct audit_names |
| 1575 | * @context: audit_context for the task |
| 1576 | * @n: audit_names structure with reportable details |
| 1577 | * @path: optional path to report instead of audit_names->name |
| 1578 | * @record_num: record number to report when handling a list of names |
| 1579 | * @call_panic: optional pointer to int that will be updated if secid fails |
| 1580 | */ |
| 1581 | void audit_log_name(struct audit_context *context, struct audit_names *n, |
| 1582 | struct path *path, int record_num, int *call_panic) |
| 1583 | { |
| 1584 | struct audit_buffer *ab; |
| 1585 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
| 1586 | if (!ab) |
| 1587 | return; |
| 1588 | |
| 1589 | audit_log_format(ab, "item=%d", record_num); |
| 1590 | |
| 1591 | if (path) |
| 1592 | audit_log_d_path(ab, " name=", path); |
| 1593 | else if (n->name) { |
| 1594 | switch (n->name_len) { |
| 1595 | case AUDIT_NAME_FULL: |
| 1596 | /* log the full path */ |
| 1597 | audit_log_format(ab, " name="); |
| 1598 | audit_log_untrustedstring(ab, n->name->name); |
| 1599 | break; |
| 1600 | case 0: |
| 1601 | /* name was specified as a relative path and the |
| 1602 | * directory component is the cwd */ |
| 1603 | audit_log_d_path(ab, " name=", &context->pwd); |
| 1604 | break; |
| 1605 | default: |
| 1606 | /* log the name's directory component */ |
| 1607 | audit_log_format(ab, " name="); |
| 1608 | audit_log_n_untrustedstring(ab, n->name->name, |
| 1609 | n->name_len); |
| 1610 | } |
| 1611 | } else |
| 1612 | audit_log_format(ab, " name=(null)"); |
| 1613 | |
| 1614 | if (n->ino != (unsigned long)-1) { |
| 1615 | audit_log_format(ab, " inode=%lu" |
| 1616 | " dev=%02x:%02x mode=%#ho" |
| 1617 | " ouid=%u ogid=%u rdev=%02x:%02x", |
| 1618 | n->ino, |
| 1619 | MAJOR(n->dev), |
| 1620 | MINOR(n->dev), |
| 1621 | n->mode, |
| 1622 | from_kuid(&init_user_ns, n->uid), |
| 1623 | from_kgid(&init_user_ns, n->gid), |
| 1624 | MAJOR(n->rdev), |
| 1625 | MINOR(n->rdev)); |
| 1626 | } |
| 1627 | if (n->osid != 0) { |
| 1628 | char *ctx = NULL; |
| 1629 | u32 len; |
| 1630 | if (security_secid_to_secctx( |
| 1631 | n->osid, &ctx, &len)) { |
| 1632 | audit_log_format(ab, " osid=%u", n->osid); |
| 1633 | if (call_panic) |
| 1634 | *call_panic = 2; |
| 1635 | } else { |
| 1636 | audit_log_format(ab, " obj=%s", ctx); |
| 1637 | security_release_secctx(ctx, len); |
| 1638 | } |
| 1639 | } |
| 1640 | |
| 1641 | audit_log_fcaps(ab, n); |
| 1642 | audit_log_end(ab); |
| 1643 | } |
| 1644 | |
| 1645 | int audit_log_task_context(struct audit_buffer *ab) |
| 1646 | { |
| 1647 | char *ctx = NULL; |
| 1648 | unsigned len; |
| 1649 | int error; |
| 1650 | u32 sid; |
| 1651 | |
| 1652 | security_task_getsecid(current, &sid); |
| 1653 | if (!sid) |
| 1654 | return 0; |
| 1655 | |
| 1656 | error = security_secid_to_secctx(sid, &ctx, &len); |
| 1657 | if (error) { |
| 1658 | if (error != -EINVAL) |
| 1659 | goto error_path; |
| 1660 | return 0; |
| 1661 | } |
| 1662 | |
| 1663 | audit_log_format(ab, " subj=%s", ctx); |
| 1664 | security_release_secctx(ctx, len); |
| 1665 | return 0; |
| 1666 | |
| 1667 | error_path: |
| 1668 | audit_panic("error in audit_log_task_context"); |
| 1669 | return error; |
| 1670 | } |
| 1671 | EXPORT_SYMBOL(audit_log_task_context); |
| 1672 | |
| 1673 | void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
| 1674 | { |
| 1675 | const struct cred *cred; |
| 1676 | char name[sizeof(tsk->comm)]; |
| 1677 | struct mm_struct *mm = tsk->mm; |
| 1678 | char *tty; |
| 1679 | |
| 1680 | if (!ab) |
| 1681 | return; |
| 1682 | |
| 1683 | /* tsk == current */ |
| 1684 | cred = current_cred(); |
| 1685 | |
| 1686 | spin_lock_irq(&tsk->sighand->siglock); |
| 1687 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
| 1688 | tty = tsk->signal->tty->name; |
| 1689 | else |
| 1690 | tty = "(none)"; |
| 1691 | spin_unlock_irq(&tsk->sighand->siglock); |
| 1692 | |
| 1693 | audit_log_format(ab, |
| 1694 | " ppid=%ld pid=%d auid=%u uid=%u gid=%u" |
| 1695 | " euid=%u suid=%u fsuid=%u" |
| 1696 | " egid=%u sgid=%u fsgid=%u ses=%u tty=%s", |
| 1697 | sys_getppid(), |
| 1698 | tsk->pid, |
| 1699 | from_kuid(&init_user_ns, audit_get_loginuid(tsk)), |
| 1700 | from_kuid(&init_user_ns, cred->uid), |
| 1701 | from_kgid(&init_user_ns, cred->gid), |
| 1702 | from_kuid(&init_user_ns, cred->euid), |
| 1703 | from_kuid(&init_user_ns, cred->suid), |
| 1704 | from_kuid(&init_user_ns, cred->fsuid), |
| 1705 | from_kgid(&init_user_ns, cred->egid), |
| 1706 | from_kgid(&init_user_ns, cred->sgid), |
| 1707 | from_kgid(&init_user_ns, cred->fsgid), |
| 1708 | audit_get_sessionid(tsk), tty); |
| 1709 | |
| 1710 | get_task_comm(name, tsk); |
| 1711 | audit_log_format(ab, " comm="); |
| 1712 | audit_log_untrustedstring(ab, name); |
| 1713 | |
| 1714 | if (mm) { |
| 1715 | down_read(&mm->mmap_sem); |
| 1716 | if (mm->exe_file) |
| 1717 | audit_log_d_path(ab, " exe=", &mm->exe_file->f_path); |
| 1718 | up_read(&mm->mmap_sem); |
| 1719 | } |
| 1720 | audit_log_task_context(ab); |
| 1721 | } |
| 1722 | EXPORT_SYMBOL(audit_log_task_info); |
| 1723 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1724 | /** |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1725 | * audit_log_link_denied - report a link restriction denial |
| 1726 | * @operation: specific link opreation |
| 1727 | * @link: the path that triggered the restriction |
| 1728 | */ |
| 1729 | void audit_log_link_denied(const char *operation, struct path *link) |
| 1730 | { |
| 1731 | struct audit_buffer *ab; |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1732 | struct audit_names *name; |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1733 | |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1734 | name = kzalloc(sizeof(*name), GFP_NOFS); |
| 1735 | if (!name) |
| 1736 | return; |
| 1737 | |
| 1738 | /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */ |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1739 | ab = audit_log_start(current->audit_context, GFP_KERNEL, |
| 1740 | AUDIT_ANOM_LINK); |
Sasha Levin | d1c7d97 | 2012-10-04 19:57:31 -0400 | [diff] [blame] | 1741 | if (!ab) |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1742 | goto out; |
| 1743 | audit_log_format(ab, "op=%s", operation); |
| 1744 | audit_log_task_info(ab, current); |
| 1745 | audit_log_format(ab, " res=0"); |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1746 | audit_log_end(ab); |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1747 | |
| 1748 | /* Generate AUDIT_PATH record with object. */ |
| 1749 | name->type = AUDIT_TYPE_NORMAL; |
| 1750 | audit_copy_inode(name, link->dentry, link->dentry->d_inode); |
| 1751 | audit_log_name(current->audit_context, name, link, 0, NULL); |
| 1752 | out: |
| 1753 | kfree(name); |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1754 | } |
| 1755 | |
| 1756 | /** |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1757 | * audit_log_end - end one audit record |
| 1758 | * @ab: the audit_buffer |
| 1759 | * |
| 1760 | * The netlink_* functions cannot be called inside an irq context, so |
| 1761 | * the audit buffer is placed on a queue and a tasklet is scheduled to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | * remove them from the queue outside the irq context. May be called in |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1763 | * any context. |
| 1764 | */ |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1765 | void audit_log_end(struct audit_buffer *ab) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | if (!ab) |
| 1768 | return; |
| 1769 | if (!audit_rate_check()) { |
| 1770 | audit_log_lost("rate limit exceeded"); |
| 1771 | } else { |
Steve Grubb | 8d07a67 | 2008-02-21 16:59:22 -0500 | [diff] [blame] | 1772 | struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); |
Hong zhi guo | 9419121 | 2013-03-27 06:49:06 +0000 | [diff] [blame] | 1773 | nlh->nlmsg_len = ab->skb->len - NLMSG_HDRLEN; |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 1774 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1775 | if (audit_pid) { |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1776 | skb_queue_tail(&audit_skb_queue, ab->skb); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1777 | wake_up_interruptible(&kauditd_wait); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 1778 | } else { |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1779 | audit_printk_skb(ab->skb); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1780 | } |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 1781 | ab->skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | } |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1783 | audit_buffer_free(ab); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | } |
| 1785 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1786 | /** |
| 1787 | * audit_log - Log an audit record |
| 1788 | * @ctx: audit context |
| 1789 | * @gfp_mask: type of allocation |
| 1790 | * @type: audit message type |
| 1791 | * @fmt: format string to use |
| 1792 | * @...: variable parameters matching the format string |
| 1793 | * |
| 1794 | * This is a convenience function that calls audit_log_start, |
| 1795 | * audit_log_vformat, and audit_log_end. It may be called |
| 1796 | * in any context. |
| 1797 | */ |
Daniel Walker | 5600b89 | 2007-10-18 03:06:10 -0700 | [diff] [blame] | 1798 | void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1799 | const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | { |
| 1801 | struct audit_buffer *ab; |
| 1802 | va_list args; |
| 1803 | |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1804 | ab = audit_log_start(ctx, gfp_mask, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | if (ab) { |
| 1806 | va_start(args, fmt); |
| 1807 | audit_log_vformat(ab, fmt, args); |
| 1808 | va_end(args); |
| 1809 | audit_log_end(ab); |
| 1810 | } |
| 1811 | } |
lorenzo@gnu.org | bf45da9 | 2006-03-09 00:33:47 +0100 | [diff] [blame] | 1812 | |
Mr Dash Four | 131ad62 | 2011-06-30 13:31:57 +0200 | [diff] [blame] | 1813 | #ifdef CONFIG_SECURITY |
| 1814 | /** |
| 1815 | * audit_log_secctx - Converts and logs SELinux context |
| 1816 | * @ab: audit_buffer |
| 1817 | * @secid: security number |
| 1818 | * |
| 1819 | * This is a helper function that calls security_secid_to_secctx to convert |
| 1820 | * secid to secctx and then adds the (converted) SELinux context to the audit |
| 1821 | * log by calling audit_log_format, thus also preventing leak of internal secid |
| 1822 | * to userspace. If secid cannot be converted audit_panic is called. |
| 1823 | */ |
| 1824 | void audit_log_secctx(struct audit_buffer *ab, u32 secid) |
| 1825 | { |
| 1826 | u32 len; |
| 1827 | char *secctx; |
| 1828 | |
| 1829 | if (security_secid_to_secctx(secid, &secctx, &len)) { |
| 1830 | audit_panic("Cannot convert secid to context"); |
| 1831 | } else { |
| 1832 | audit_log_format(ab, " obj=%s", secctx); |
| 1833 | security_release_secctx(secctx, len); |
| 1834 | } |
| 1835 | } |
| 1836 | EXPORT_SYMBOL(audit_log_secctx); |
| 1837 | #endif |
| 1838 | |
lorenzo@gnu.org | bf45da9 | 2006-03-09 00:33:47 +0100 | [diff] [blame] | 1839 | EXPORT_SYMBOL(audit_log_start); |
| 1840 | EXPORT_SYMBOL(audit_log_end); |
| 1841 | EXPORT_SYMBOL(audit_log_format); |
| 1842 | EXPORT_SYMBOL(audit_log); |