| 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | #include <linux/audit.h> |
| 54 | |
| 55 | #include <net/sock.h> |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 56 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #include <linux/skbuff.h> |
Mr Dash Four | 131ad62 | 2011-06-30 13:31:57 +0200 | [diff] [blame] | 58 | #ifdef CONFIG_SECURITY |
| 59 | #include <linux/security.h> |
| 60 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <linux/netlink.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 62 | #include <linux/freezer.h> |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 63 | #include <linux/tty.h> |
Eric W. Biederman | 34e36d8 | 2012-09-10 23:20:20 -0700 | [diff] [blame] | 64 | #include <linux/pid_namespace.h> |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 65 | |
| 66 | #include "audit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 68 | /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | * (Initialization happens after skb_init is called.) */ |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 70 | #define AUDIT_DISABLED -1 |
| 71 | #define AUDIT_UNINITIALIZED 0 |
| 72 | #define AUDIT_INITIALIZED 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | static int audit_initialized; |
| 74 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 75 | #define AUDIT_OFF 0 |
| 76 | #define AUDIT_ON 1 |
| 77 | #define AUDIT_LOCKED 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | int audit_enabled; |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 79 | int audit_ever_enabled; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Jan Engelhardt | ae9d67af | 2011-01-18 06:48:12 +0100 | [diff] [blame] | 81 | EXPORT_SYMBOL_GPL(audit_enabled); |
| 82 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | /* Default state when kernel boots without any parameters. */ |
| 84 | static int audit_default; |
| 85 | |
| 86 | /* If auditing cannot proceed, audit_failure selects what happens. */ |
| 87 | static int audit_failure = AUDIT_FAIL_PRINTK; |
| 88 | |
Pavel Emelyanov | 75c0371 | 2008-03-20 15:39:41 -0700 | [diff] [blame] | 89 | /* |
| 90 | * 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] | 91 | * contains the pid of the auditd process and audit_nlk_portid contains |
| 92 | * the portid to use to send netlink messages to that process. |
Pavel Emelyanov | 75c0371 | 2008-03-20 15:39:41 -0700 | [diff] [blame] | 93 | */ |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 94 | int audit_pid; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 95 | static int audit_nlk_portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 97 | /* 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] | 98 | * to that number per second. This prevents DoS attacks, but results in |
| 99 | * audit records being dropped. */ |
| 100 | static int audit_rate_limit; |
| 101 | |
| 102 | /* Number of outstanding audit_buffers allowed. */ |
| 103 | static int audit_backlog_limit = 64; |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 104 | static int audit_backlog_wait_time = 60 * HZ; |
| 105 | static int audit_backlog_wait_overflow = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 107 | /* The identity of the user shutting down the audit system. */ |
Eric W. Biederman | cca080d | 2012-02-07 16:53:48 -0800 | [diff] [blame] | 108 | kuid_t audit_sig_uid = INVALID_UID; |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 109 | pid_t audit_sig_pid = -1; |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 110 | u32 audit_sig_sid = 0; |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | /* Records can be lost in several ways: |
| 113 | 0) [suppressed in audit_alloc] |
| 114 | 1) out of memory in audit_log_start [kmalloc of struct audit_buffer] |
| 115 | 2) out of memory in audit_log_move [alloc_skb] |
| 116 | 3) suppressed due to audit_rate_limit |
| 117 | 4) suppressed due to audit_backlog_limit |
| 118 | */ |
| 119 | static atomic_t audit_lost = ATOMIC_INIT(0); |
| 120 | |
| 121 | /* The netlink socket. */ |
| 122 | static struct sock *audit_sock; |
| 123 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 124 | /* Hash for inode-based rules */ |
| 125 | struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; |
| 126 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 127 | /* 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] | 128 | * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of |
| 129 | * being placed on the freelist). */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | static DEFINE_SPINLOCK(audit_freelist_lock); |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 131 | static int audit_freelist_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | static LIST_HEAD(audit_freelist); |
| 133 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 134 | static struct sk_buff_head audit_skb_queue; |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 135 | /* queue of skbs to send to auditd when/if it comes back */ |
| 136 | static struct sk_buff_head audit_skb_hold_queue; |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 137 | static struct task_struct *kauditd_task; |
| 138 | static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait); |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 139 | static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 141 | /* Serialize requests from userspace. */ |
Al Viro | 916d757 | 2009-06-24 00:02:38 -0400 | [diff] [blame] | 142 | DEFINE_MUTEX(audit_cmd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
| 144 | /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting |
| 145 | * audit records. Since printk uses a 1024 byte buffer, this buffer |
| 146 | * should be at least that large. */ |
| 147 | #define AUDIT_BUFSIZ 1024 |
| 148 | |
| 149 | /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the |
| 150 | * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */ |
| 151 | #define AUDIT_MAXFREE (2*NR_CPUS) |
| 152 | |
| 153 | /* The audit_buffer is used when formatting an audit record. The caller |
| 154 | * locks briefly to get the record off the freelist or to allocate the |
| 155 | * buffer, and locks briefly to send the buffer to the netlink layer or |
| 156 | * to place it on a transmit queue. Multiple audit_buffers can be in |
| 157 | * use simultaneously. */ |
| 158 | struct audit_buffer { |
| 159 | struct list_head list; |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 160 | struct sk_buff *skb; /* formatted skb ready to send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | struct audit_context *ctx; /* NULL or associated context */ |
Al Viro | 9796fdd | 2005-10-21 03:22:03 -0400 | [diff] [blame] | 162 | gfp_t gfp_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | }; |
| 164 | |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 165 | struct audit_reply { |
| 166 | int pid; |
| 167 | struct sk_buff *skb; |
| 168 | }; |
| 169 | |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 170 | static void audit_set_pid(struct audit_buffer *ab, pid_t pid) |
| 171 | { |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 172 | if (ab) { |
| 173 | struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); |
| 174 | nlh->nlmsg_pid = pid; |
| 175 | } |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 176 | } |
| 177 | |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 178 | void audit_panic(const char *message) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
| 180 | switch (audit_failure) |
| 181 | { |
| 182 | case AUDIT_FAIL_SILENT: |
| 183 | break; |
| 184 | case AUDIT_FAIL_PRINTK: |
Eric Paris | 320f1b1 | 2008-01-23 22:55:05 -0500 | [diff] [blame] | 185 | if (printk_ratelimit()) |
| 186 | printk(KERN_ERR "audit: %s\n", message); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | break; |
| 188 | case AUDIT_FAIL_PANIC: |
Eric Paris | b29ee87 | 2008-02-21 15:53:05 -0500 | [diff] [blame] | 189 | /* test audit_pid since printk is always losey, why bother? */ |
| 190 | if (audit_pid) |
| 191 | panic("audit: %s\n", message); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | break; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | static inline int audit_rate_check(void) |
| 197 | { |
| 198 | static unsigned long last_check = 0; |
| 199 | static int messages = 0; |
| 200 | static DEFINE_SPINLOCK(lock); |
| 201 | unsigned long flags; |
| 202 | unsigned long now; |
| 203 | unsigned long elapsed; |
| 204 | int retval = 0; |
| 205 | |
| 206 | if (!audit_rate_limit) return 1; |
| 207 | |
| 208 | spin_lock_irqsave(&lock, flags); |
| 209 | if (++messages < audit_rate_limit) { |
| 210 | retval = 1; |
| 211 | } else { |
| 212 | now = jiffies; |
| 213 | elapsed = now - last_check; |
| 214 | if (elapsed > HZ) { |
| 215 | last_check = now; |
| 216 | messages = 0; |
| 217 | retval = 1; |
| 218 | } |
| 219 | } |
| 220 | spin_unlock_irqrestore(&lock, flags); |
| 221 | |
| 222 | return retval; |
| 223 | } |
| 224 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 225 | /** |
| 226 | * audit_log_lost - conditionally log lost audit message event |
| 227 | * @message: the message stating reason for lost audit message |
| 228 | * |
| 229 | * Emit at least 1 message per second, even if audit_rate_check is |
| 230 | * throttling. |
| 231 | * Always increment the lost messages counter. |
| 232 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | void audit_log_lost(const char *message) |
| 234 | { |
| 235 | static unsigned long last_msg = 0; |
| 236 | static DEFINE_SPINLOCK(lock); |
| 237 | unsigned long flags; |
| 238 | unsigned long now; |
| 239 | int print; |
| 240 | |
| 241 | atomic_inc(&audit_lost); |
| 242 | |
| 243 | print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit); |
| 244 | |
| 245 | if (!print) { |
| 246 | spin_lock_irqsave(&lock, flags); |
| 247 | now = jiffies; |
| 248 | if (now - last_msg > HZ) { |
| 249 | print = 1; |
| 250 | last_msg = now; |
| 251 | } |
| 252 | spin_unlock_irqrestore(&lock, flags); |
| 253 | } |
| 254 | |
| 255 | if (print) { |
Eric Paris | 320f1b1 | 2008-01-23 22:55:05 -0500 | [diff] [blame] | 256 | if (printk_ratelimit()) |
| 257 | printk(KERN_WARNING |
| 258 | "audit: audit_lost=%d audit_rate_limit=%d " |
| 259 | "audit_backlog_limit=%d\n", |
| 260 | atomic_read(&audit_lost), |
| 261 | audit_rate_limit, |
| 262 | audit_backlog_limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | audit_panic(message); |
| 264 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
| 266 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 267 | static int audit_log_config_change(char *function_name, int new, int old, |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 268 | kuid_t loginuid, u32 sessionid, u32 sid, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 269 | int allow_changes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | { |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 271 | struct audit_buffer *ab; |
| 272 | int rc = 0; |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 273 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 274 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); |
Kees Cook | 0644ec0 | 2013-01-11 14:32:07 -0800 | [diff] [blame] | 275 | if (unlikely(!ab)) |
| 276 | return rc; |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 277 | audit_log_format(ab, "%s=%d old=%d auid=%u ses=%u", function_name, new, |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 278 | old, from_kuid(&init_user_ns, loginuid), sessionid); |
Steve Grubb | ce29b68 | 2006-04-01 18:29:34 -0500 | [diff] [blame] | 279 | if (sid) { |
| 280 | char *ctx = NULL; |
| 281 | u32 len; |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 282 | |
Ahmed S. Darwish | 2a862b3 | 2008-03-01 21:54:38 +0200 | [diff] [blame] | 283 | rc = security_secid_to_secctx(sid, &ctx, &len); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 284 | if (rc) { |
| 285 | audit_log_format(ab, " sid=%u", sid); |
| 286 | allow_changes = 0; /* Something weird, deny request */ |
| 287 | } else { |
| 288 | audit_log_format(ab, " subj=%s", ctx); |
Ahmed S. Darwish | 2a862b3 | 2008-03-01 21:54:38 +0200 | [diff] [blame] | 289 | security_release_secctx(ctx, len); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 290 | } |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 291 | } |
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 | |
| 297 | static int audit_do_config_change(char *function_name, int *to_change, |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 298 | int new, kuid_t loginuid, u32 sessionid, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 299 | u32 sid) |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 300 | { |
| 301 | int allow_changes, rc = 0, old = *to_change; |
| 302 | |
| 303 | /* check if we are locked */ |
| 304 | if (audit_enabled == AUDIT_LOCKED) |
| 305 | allow_changes = 0; |
| 306 | else |
| 307 | allow_changes = 1; |
| 308 | |
| 309 | if (audit_enabled != AUDIT_OFF) { |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 310 | rc = audit_log_config_change(function_name, new, old, loginuid, |
| 311 | sessionid, sid, allow_changes); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 312 | if (rc) |
| 313 | allow_changes = 0; |
| 314 | } |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 315 | |
| 316 | /* If we are allowed, make the change */ |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 317 | if (allow_changes == 1) |
| 318 | *to_change = new; |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 319 | /* Not allowed, update reason */ |
| 320 | else if (rc == 0) |
| 321 | rc = -EPERM; |
| 322 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | } |
| 324 | |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 325 | static int audit_set_rate_limit(int limit, kuid_t loginuid, u32 sessionid, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 326 | u32 sid) |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 327 | { |
| 328 | return audit_do_config_change("audit_rate_limit", &audit_rate_limit, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 329 | limit, loginuid, sessionid, sid); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 330 | } |
| 331 | |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 332 | static int audit_set_backlog_limit(int limit, kuid_t loginuid, u32 sessionid, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 333 | u32 sid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | { |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 335 | return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 336 | limit, loginuid, sessionid, sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | } |
| 338 | |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 339 | static int audit_set_enabled(int state, kuid_t loginuid, u32 sessionid, u32 sid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | { |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 341 | int rc; |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 342 | if (state < AUDIT_OFF || state > AUDIT_LOCKED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | return -EINVAL; |
Steve Grubb | ce29b68 | 2006-04-01 18:29:34 -0500 | [diff] [blame] | 344 | |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 345 | rc = audit_do_config_change("audit_enabled", &audit_enabled, state, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 346 | loginuid, sessionid, sid); |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 347 | |
| 348 | if (!rc) |
| 349 | audit_ever_enabled |= !!state; |
| 350 | |
| 351 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | } |
| 353 | |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 354 | static int audit_set_failure(int state, kuid_t loginuid, u32 sessionid, u32 sid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | if (state != AUDIT_FAIL_SILENT |
| 357 | && state != AUDIT_FAIL_PRINTK |
| 358 | && state != AUDIT_FAIL_PANIC) |
| 359 | return -EINVAL; |
Steve Grubb | ce29b68 | 2006-04-01 18:29:34 -0500 | [diff] [blame] | 360 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 361 | return audit_do_config_change("audit_failure", &audit_failure, state, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 362 | loginuid, sessionid, sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } |
| 364 | |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 365 | /* |
| 366 | * Queue skbs to be sent to auditd when/if it comes back. These skbs should |
| 367 | * already have been sent via prink/syslog and so if these messages are dropped |
| 368 | * it is not a huge concern since we already passed the audit_log_lost() |
| 369 | * notification and stuff. This is just nice to get audit messages during |
| 370 | * boot before auditd is running or messages generated while auditd is stopped. |
| 371 | * This only holds messages is audit_default is set, aka booting with audit=1 |
| 372 | * or building your kernel that way. |
| 373 | */ |
| 374 | static void audit_hold_skb(struct sk_buff *skb) |
| 375 | { |
| 376 | if (audit_default && |
| 377 | skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit) |
| 378 | skb_queue_tail(&audit_skb_hold_queue, skb); |
| 379 | else |
| 380 | kfree_skb(skb); |
| 381 | } |
| 382 | |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 383 | /* |
| 384 | * For one reason or another this nlh isn't getting delivered to the userspace |
| 385 | * audit daemon, just send it to printk. |
| 386 | */ |
| 387 | static void audit_printk_skb(struct sk_buff *skb) |
| 388 | { |
| 389 | struct nlmsghdr *nlh = nlmsg_hdr(skb); |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 390 | char *data = nlmsg_data(nlh); |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 391 | |
| 392 | if (nlh->nlmsg_type != AUDIT_EOE) { |
| 393 | if (printk_ratelimit()) |
| 394 | printk(KERN_NOTICE "type=%d %s\n", nlh->nlmsg_type, data); |
| 395 | else |
| 396 | audit_log_lost("printk limit exceeded\n"); |
| 397 | } |
| 398 | |
| 399 | audit_hold_skb(skb); |
| 400 | } |
| 401 | |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 402 | static void kauditd_send_skb(struct sk_buff *skb) |
| 403 | { |
| 404 | int err; |
| 405 | /* take a reference in case we can't send it and we want to hold it */ |
| 406 | skb_get(skb); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 407 | err = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 408 | if (err < 0) { |
Adam Buchbinder | c9404c9 | 2009-12-18 15:40:42 -0500 | [diff] [blame] | 409 | BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */ |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 410 | 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] | 411 | audit_log_lost("auditd disappeared\n"); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 412 | audit_pid = 0; |
| 413 | /* we might get lucky and get this in the next auditd */ |
| 414 | audit_hold_skb(skb); |
| 415 | } else |
| 416 | /* drop the extra reference if sent ok */ |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 417 | consume_skb(skb); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 418 | } |
| 419 | |
Richard Guy Briggs | b551d1d | 2013-01-24 13:15:10 -0500 | [diff] [blame] | 420 | /* |
| 421 | * flush_hold_queue - empty the hold queue if auditd appears |
| 422 | * |
| 423 | * If auditd just started, drain the queue of messages already |
| 424 | * sent to syslog/printk. Remember loss here is ok. We already |
| 425 | * called audit_log_lost() if it didn't go out normally. so the |
| 426 | * race between the skb_dequeue and the next check for audit_pid |
| 427 | * doesn't matter. |
| 428 | * |
| 429 | * If you ever find kauditd to be too slow we can get a perf win |
| 430 | * by doing our own locking and keeping better track if there |
| 431 | * are messages in this queue. I don't see the need now, but |
| 432 | * in 5 years when I want to play with this again I'll see this |
| 433 | * note and still have no friggin idea what i'm thinking today. |
| 434 | */ |
| 435 | static void flush_hold_queue(void) |
| 436 | { |
| 437 | struct sk_buff *skb; |
| 438 | |
| 439 | if (!audit_default || !audit_pid) |
| 440 | return; |
| 441 | |
| 442 | skb = skb_dequeue(&audit_skb_hold_queue); |
| 443 | if (likely(!skb)) |
| 444 | return; |
| 445 | |
| 446 | while (skb && audit_pid) { |
| 447 | kauditd_send_skb(skb); |
| 448 | skb = skb_dequeue(&audit_skb_hold_queue); |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | * if auditd just disappeared but we |
| 453 | * dequeued an skb we need to drop ref |
| 454 | */ |
| 455 | if (skb) |
| 456 | consume_skb(skb); |
| 457 | } |
| 458 | |
Adrian Bunk | 97a41e2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 459 | static int kauditd_thread(void *dummy) |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 460 | { |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 461 | set_freezable(); |
Andrew Morton | 4899b8b | 2006-10-06 00:43:48 -0700 | [diff] [blame] | 462 | while (!kthread_should_stop()) { |
Richard Guy Briggs | 3320c51 | 2013-01-24 13:15:11 -0500 | [diff] [blame] | 463 | struct sk_buff *skb; |
| 464 | DECLARE_WAITQUEUE(wait, current); |
| 465 | |
Richard Guy Briggs | b551d1d | 2013-01-24 13:15:10 -0500 | [diff] [blame] | 466 | flush_hold_queue(); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 467 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 468 | skb = skb_dequeue(&audit_skb_queue); |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 469 | wake_up(&audit_backlog_wait); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 470 | if (skb) { |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 471 | if (audit_pid) |
| 472 | kauditd_send_skb(skb); |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 473 | else |
| 474 | audit_printk_skb(skb); |
Richard Guy Briggs | 3320c51 | 2013-01-24 13:15:11 -0500 | [diff] [blame] | 475 | continue; |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 476 | } |
Richard Guy Briggs | 3320c51 | 2013-01-24 13:15:11 -0500 | [diff] [blame] | 477 | set_current_state(TASK_INTERRUPTIBLE); |
| 478 | add_wait_queue(&kauditd_wait, &wait); |
| 479 | |
| 480 | if (!skb_queue_len(&audit_skb_queue)) { |
| 481 | try_to_freeze(); |
| 482 | schedule(); |
| 483 | } |
| 484 | |
| 485 | __set_current_state(TASK_RUNNING); |
| 486 | remove_wait_queue(&kauditd_wait, &wait); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 487 | } |
Andrew Morton | 4899b8b | 2006-10-06 00:43:48 -0700 | [diff] [blame] | 488 | return 0; |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 489 | } |
| 490 | |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 491 | int audit_send_list(void *_dest) |
| 492 | { |
| 493 | struct audit_netlink_list *dest = _dest; |
| 494 | int pid = dest->pid; |
| 495 | struct sk_buff *skb; |
| 496 | |
| 497 | /* wait for parent to finish and send an ACK */ |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 498 | mutex_lock(&audit_cmd_mutex); |
| 499 | mutex_unlock(&audit_cmd_mutex); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 500 | |
| 501 | while ((skb = __skb_dequeue(&dest->q)) != NULL) |
| 502 | netlink_unicast(audit_sock, skb, pid, 0); |
| 503 | |
| 504 | kfree(dest); |
| 505 | |
| 506 | return 0; |
| 507 | } |
| 508 | |
| 509 | 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] | 510 | int multi, const void *payload, int size) |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 511 | { |
| 512 | struct sk_buff *skb; |
| 513 | struct nlmsghdr *nlh; |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 514 | void *data; |
| 515 | int flags = multi ? NLM_F_MULTI : 0; |
| 516 | int t = done ? NLMSG_DONE : type; |
| 517 | |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 518 | skb = nlmsg_new(size, GFP_KERNEL); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 519 | if (!skb) |
| 520 | return NULL; |
| 521 | |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 522 | nlh = nlmsg_put(skb, pid, seq, t, size, flags); |
| 523 | if (!nlh) |
| 524 | goto out_kfree_skb; |
| 525 | data = nlmsg_data(nlh); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 526 | memcpy(data, payload, size); |
| 527 | return skb; |
| 528 | |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 529 | out_kfree_skb: |
| 530 | kfree_skb(skb); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 531 | return NULL; |
| 532 | } |
| 533 | |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 534 | static int audit_send_reply_thread(void *arg) |
| 535 | { |
| 536 | struct audit_reply *reply = (struct audit_reply *)arg; |
| 537 | |
| 538 | mutex_lock(&audit_cmd_mutex); |
| 539 | mutex_unlock(&audit_cmd_mutex); |
| 540 | |
| 541 | /* Ignore failure. It'll only happen if the sender goes away, |
| 542 | because our timeout is set to infinite. */ |
| 543 | netlink_unicast(audit_sock, reply->skb, reply->pid, 0); |
| 544 | kfree(reply); |
| 545 | return 0; |
| 546 | } |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 547 | /** |
| 548 | * audit_send_reply - send an audit reply message via netlink |
| 549 | * @pid: process id to send reply to |
| 550 | * @seq: sequence number |
| 551 | * @type: audit message type |
| 552 | * @done: done (last) flag |
| 553 | * @multi: multi-part message flag |
| 554 | * @payload: payload data |
| 555 | * @size: payload size |
| 556 | * |
| 557 | * Allocates an skb, builds the netlink message, and sends it to the pid. |
| 558 | * No failure notifications. |
| 559 | */ |
Stephen Hemminger | b8800aa | 2010-10-20 17:23:50 -0700 | [diff] [blame] | 560 | static void audit_send_reply(int pid, int seq, int type, int done, int multi, |
| 561 | const void *payload, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | { |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 563 | struct sk_buff *skb; |
| 564 | struct task_struct *tsk; |
| 565 | struct audit_reply *reply = kmalloc(sizeof(struct audit_reply), |
| 566 | GFP_KERNEL); |
| 567 | |
| 568 | if (!reply) |
| 569 | return; |
| 570 | |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 571 | skb = audit_make_reply(pid, seq, type, done, multi, payload, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | if (!skb) |
Andrew Morton | fcaf1eb | 2008-05-14 16:11:48 -0700 | [diff] [blame] | 573 | goto out; |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 574 | |
| 575 | reply->pid = pid; |
| 576 | reply->skb = skb; |
| 577 | |
| 578 | tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply"); |
Andrew Morton | fcaf1eb | 2008-05-14 16:11:48 -0700 | [diff] [blame] | 579 | if (!IS_ERR(tsk)) |
| 580 | return; |
| 581 | kfree_skb(skb); |
| 582 | out: |
| 583 | kfree(reply); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | /* |
| 587 | * Check for appropriate CAP_AUDIT_ capabilities on incoming audit |
| 588 | * control messages. |
| 589 | */ |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 590 | static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | { |
| 592 | int err = 0; |
| 593 | |
Eric W. Biederman | 34e36d8 | 2012-09-10 23:20:20 -0700 | [diff] [blame] | 594 | /* Only support the initial namespaces for now. */ |
| 595 | if ((current_user_ns() != &init_user_ns) || |
| 596 | (task_active_pid_ns(current) != &init_pid_ns)) |
| 597 | return -EPERM; |
| 598 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | switch (msg_type) { |
| 600 | case AUDIT_GET: |
| 601 | case AUDIT_LIST: |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 602 | case AUDIT_LIST_RULES: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | case AUDIT_SET: |
| 604 | case AUDIT_ADD: |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 605 | case AUDIT_ADD_RULE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | case AUDIT_DEL: |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 607 | case AUDIT_DEL_RULE: |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 608 | case AUDIT_SIGNAL_INFO: |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 609 | case AUDIT_TTY_GET: |
| 610 | case AUDIT_TTY_SET: |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 611 | case AUDIT_TRIM: |
| 612 | case AUDIT_MAKE_EQUIV: |
Eric Paris | fd77846 | 2012-01-03 12:25:16 -0500 | [diff] [blame] | 613 | if (!capable(CAP_AUDIT_CONTROL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | err = -EPERM; |
| 615 | break; |
Steve Grubb | 0547410 | 2005-05-21 00:18:37 +0100 | [diff] [blame] | 616 | case AUDIT_USER: |
Robert P. J. Day | 039b6b3 | 2007-05-08 00:29:20 -0700 | [diff] [blame] | 617 | case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: |
| 618 | case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
Eric Paris | fd77846 | 2012-01-03 12:25:16 -0500 | [diff] [blame] | 619 | if (!capable(CAP_AUDIT_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | err = -EPERM; |
| 621 | break; |
| 622 | default: /* bad msg */ |
| 623 | err = -EINVAL; |
| 624 | } |
| 625 | |
| 626 | return err; |
| 627 | } |
| 628 | |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 629 | static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type, |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 630 | kuid_t auid, u32 ses, u32 sid) |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 631 | { |
| 632 | int rc = 0; |
| 633 | char *ctx = NULL; |
| 634 | u32 len; |
| 635 | |
| 636 | if (!audit_enabled) { |
| 637 | *ab = NULL; |
| 638 | return rc; |
| 639 | } |
| 640 | |
| 641 | *ab = audit_log_start(NULL, GFP_KERNEL, msg_type); |
Kees Cook | 0644ec0 | 2013-01-11 14:32:07 -0800 | [diff] [blame] | 642 | if (unlikely(!*ab)) |
| 643 | return rc; |
Eric Paris | 3035c51 | 2012-01-03 14:23:05 -0500 | [diff] [blame] | 644 | audit_log_format(*ab, "pid=%d uid=%u auid=%u ses=%u", |
Eric W. Biederman | 860c0aa | 2012-09-11 00:24:49 -0700 | [diff] [blame] | 645 | task_tgid_vnr(current), |
| 646 | from_kuid(&init_user_ns, current_uid()), |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 647 | from_kuid(&init_user_ns, auid), ses); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 648 | if (sid) { |
Ahmed S. Darwish | 2a862b3 | 2008-03-01 21:54:38 +0200 | [diff] [blame] | 649 | rc = security_secid_to_secctx(sid, &ctx, &len); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 650 | if (rc) |
| 651 | audit_log_format(*ab, " ssid=%u", sid); |
Ahmed S. Darwish | 2a862b3 | 2008-03-01 21:54:38 +0200 | [diff] [blame] | 652 | else { |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 653 | audit_log_format(*ab, " subj=%s", ctx); |
Ahmed S. Darwish | 2a862b3 | 2008-03-01 21:54:38 +0200 | [diff] [blame] | 654 | security_release_secctx(ctx, len); |
| 655 | } |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 656 | } |
| 657 | |
| 658 | return rc; |
| 659 | } |
| 660 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 662 | { |
Eric W. Biederman | 860c0aa | 2012-09-11 00:24:49 -0700 | [diff] [blame] | 663 | u32 seq, sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | void *data; |
| 665 | struct audit_status *status_get, status_set; |
| 666 | int err; |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 667 | struct audit_buffer *ab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | u16 msg_type = nlh->nlmsg_type; |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 669 | kuid_t loginuid; /* loginuid of sender */ |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 670 | u32 sessionid; |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 671 | struct audit_sig_info *sig_data; |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 672 | char *ctx = NULL; |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 673 | u32 len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 675 | err = audit_netlink_ok(skb, msg_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | if (err) |
| 677 | return err; |
| 678 | |
Patrick McHardy | c53fa1e | 2011-03-03 10:55:40 -0800 | [diff] [blame] | 679 | loginuid = audit_get_loginuid(current); |
| 680 | sessionid = audit_get_sessionid(current); |
| 681 | security_task_getsecid(current, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | seq = nlh->nlmsg_seq; |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 683 | data = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
| 685 | switch (msg_type) { |
| 686 | case AUDIT_GET: |
| 687 | status_set.enabled = audit_enabled; |
| 688 | status_set.failure = audit_failure; |
| 689 | status_set.pid = audit_pid; |
| 690 | status_set.rate_limit = audit_rate_limit; |
| 691 | status_set.backlog_limit = audit_backlog_limit; |
| 692 | status_set.lost = atomic_read(&audit_lost); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 693 | status_set.backlog = skb_queue_len(&audit_skb_queue); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 694 | audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | &status_set, sizeof(status_set)); |
| 696 | break; |
| 697 | case AUDIT_SET: |
| 698 | if (nlh->nlmsg_len < sizeof(struct audit_status)) |
| 699 | return -EINVAL; |
| 700 | status_get = (struct audit_status *)data; |
| 701 | if (status_get->mask & AUDIT_STATUS_ENABLED) { |
Steve Grubb | ce29b68 | 2006-04-01 18:29:34 -0500 | [diff] [blame] | 702 | err = audit_set_enabled(status_get->enabled, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 703 | loginuid, sessionid, sid); |
zhangxiliang | 20c6aaa | 2008-07-31 10:11:19 +0800 | [diff] [blame] | 704 | if (err < 0) |
| 705 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | } |
| 707 | if (status_get->mask & AUDIT_STATUS_FAILURE) { |
Steve Grubb | ce29b68 | 2006-04-01 18:29:34 -0500 | [diff] [blame] | 708 | err = audit_set_failure(status_get->failure, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 709 | loginuid, sessionid, sid); |
zhangxiliang | 20c6aaa | 2008-07-31 10:11:19 +0800 | [diff] [blame] | 710 | if (err < 0) |
| 711 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | } |
| 713 | if (status_get->mask & AUDIT_STATUS_PID) { |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 714 | int new_pid = status_get->pid; |
| 715 | |
| 716 | if (audit_enabled != AUDIT_OFF) |
| 717 | audit_log_config_change("audit_pid", new_pid, |
| 718 | audit_pid, loginuid, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 719 | sessionid, sid, 1); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 720 | |
| 721 | audit_pid = new_pid; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 722 | audit_nlk_portid = NETLINK_CB(skb).portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | } |
zhangxiliang | 20c6aaa | 2008-07-31 10:11:19 +0800 | [diff] [blame] | 724 | if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) { |
Serge E. Hallyn | 5d136a0 | 2006-04-27 16:45:14 -0500 | [diff] [blame] | 725 | err = audit_set_rate_limit(status_get->rate_limit, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 726 | loginuid, sessionid, sid); |
zhangxiliang | 20c6aaa | 2008-07-31 10:11:19 +0800 | [diff] [blame] | 727 | if (err < 0) |
| 728 | return err; |
| 729 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT) |
Serge E. Hallyn | 5d136a0 | 2006-04-27 16:45:14 -0500 | [diff] [blame] | 731 | err = audit_set_backlog_limit(status_get->backlog_limit, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 732 | loginuid, sessionid, sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | break; |
Steve Grubb | 0547410 | 2005-05-21 00:18:37 +0100 | [diff] [blame] | 734 | case AUDIT_USER: |
Robert P. J. Day | 039b6b3 | 2007-05-08 00:29:20 -0700 | [diff] [blame] | 735 | case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: |
| 736 | case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
David Woodhouse | 4a4cd63 | 2005-06-22 14:56:47 +0100 | [diff] [blame] | 737 | if (!audit_enabled && msg_type != AUDIT_USER_AVC) |
| 738 | return 0; |
David Woodhouse | 0f45aa1 | 2005-06-19 19:35:50 +0100 | [diff] [blame] | 739 | |
Eric W. Biederman | 02276bd | 2012-09-10 23:10:16 -0700 | [diff] [blame] | 740 | err = audit_filter_user(); |
David Woodhouse | 4a4cd63 | 2005-06-22 14:56:47 +0100 | [diff] [blame] | 741 | if (err == 1) { |
| 742 | err = 0; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 743 | if (msg_type == AUDIT_USER_TTY) { |
Eric W. Biederman | f95732e | 2012-09-10 23:31:17 -0700 | [diff] [blame] | 744 | err = tty_audit_push_task(current, loginuid, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 745 | sessionid); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 746 | if (err) |
| 747 | break; |
| 748 | } |
Eric W. Biederman | 860c0aa | 2012-09-11 00:24:49 -0700 | [diff] [blame] | 749 | audit_log_common_recv_msg(&ab, msg_type, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 750 | loginuid, sessionid, sid); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 751 | |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 752 | if (msg_type != AUDIT_USER_TTY) |
| 753 | audit_log_format(ab, " msg='%.1024s'", |
| 754 | (char *)data); |
| 755 | else { |
| 756 | int size; |
| 757 | |
Eric Paris | f761610 | 2013-04-11 11:25:00 -0400 | [diff] [blame^] | 758 | audit_log_format(ab, " data="); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 759 | size = nlmsg_len(nlh); |
Miloslav Trmac | 55ad2f8 | 2009-03-19 09:52:47 -0400 | [diff] [blame] | 760 | if (size > 0 && |
| 761 | ((unsigned char *)data)[size - 1] == '\0') |
| 762 | size--; |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 763 | audit_log_n_untrustedstring(ab, data, size); |
David Woodhouse | 4a4cd63 | 2005-06-22 14:56:47 +0100 | [diff] [blame] | 764 | } |
Linus Torvalds | aecdc33 | 2012-10-02 13:38:27 -0700 | [diff] [blame] | 765 | audit_set_pid(ab, NETLINK_CB(skb).portid); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 766 | audit_log_end(ab); |
David Woodhouse | 0f45aa1 | 2005-06-19 19:35:50 +0100 | [diff] [blame] | 767 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | break; |
| 769 | case AUDIT_ADD: |
| 770 | case AUDIT_DEL: |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 771 | if (nlmsg_len(nlh) < sizeof(struct audit_rule)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | return -EINVAL; |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 773 | if (audit_enabled == AUDIT_LOCKED) { |
Eric W. Biederman | 860c0aa | 2012-09-11 00:24:49 -0700 | [diff] [blame] | 774 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, |
| 775 | loginuid, sessionid, sid); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 776 | |
| 777 | audit_log_format(ab, " audit_enabled=%d res=0", |
| 778 | audit_enabled); |
| 779 | audit_log_end(ab); |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 780 | return -EPERM; |
| 781 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | /* fallthrough */ |
| 783 | case AUDIT_LIST: |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 784 | err = audit_receive_filter(msg_type, NETLINK_CB(skb).portid, |
Eric W. Biederman | 017143f | 2012-09-11 00:19:06 -0700 | [diff] [blame] | 785 | seq, data, nlmsg_len(nlh), |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 786 | loginuid, sessionid, sid); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 787 | break; |
| 788 | case AUDIT_ADD_RULE: |
| 789 | case AUDIT_DEL_RULE: |
| 790 | if (nlmsg_len(nlh) < sizeof(struct audit_rule_data)) |
| 791 | return -EINVAL; |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 792 | if (audit_enabled == AUDIT_LOCKED) { |
Eric W. Biederman | 860c0aa | 2012-09-11 00:24:49 -0700 | [diff] [blame] | 793 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, |
| 794 | loginuid, sessionid, sid); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 795 | |
| 796 | audit_log_format(ab, " audit_enabled=%d res=0", |
| 797 | audit_enabled); |
| 798 | audit_log_end(ab); |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 799 | return -EPERM; |
| 800 | } |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 801 | /* fallthrough */ |
| 802 | case AUDIT_LIST_RULES: |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 803 | err = audit_receive_filter(msg_type, NETLINK_CB(skb).portid, |
Eric W. Biederman | 017143f | 2012-09-11 00:19:06 -0700 | [diff] [blame] | 804 | seq, data, nlmsg_len(nlh), |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 805 | loginuid, sessionid, sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 807 | case AUDIT_TRIM: |
| 808 | audit_trim_trees(); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 809 | |
Eric W. Biederman | 860c0aa | 2012-09-11 00:24:49 -0700 | [diff] [blame] | 810 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, |
| 811 | loginuid, sessionid, sid); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 812 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 813 | audit_log_format(ab, " op=trim res=1"); |
| 814 | audit_log_end(ab); |
| 815 | break; |
| 816 | case AUDIT_MAKE_EQUIV: { |
| 817 | void *bufp = data; |
| 818 | u32 sizes[2]; |
Harvey Harrison | 7719e43 | 2008-04-27 02:39:56 -0700 | [diff] [blame] | 819 | size_t msglen = nlmsg_len(nlh); |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 820 | char *old, *new; |
| 821 | |
| 822 | err = -EINVAL; |
Harvey Harrison | 7719e43 | 2008-04-27 02:39:56 -0700 | [diff] [blame] | 823 | if (msglen < 2 * sizeof(u32)) |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 824 | break; |
| 825 | memcpy(sizes, bufp, 2 * sizeof(u32)); |
| 826 | bufp += 2 * sizeof(u32); |
Harvey Harrison | 7719e43 | 2008-04-27 02:39:56 -0700 | [diff] [blame] | 827 | msglen -= 2 * sizeof(u32); |
| 828 | old = audit_unpack_string(&bufp, &msglen, sizes[0]); |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 829 | if (IS_ERR(old)) { |
| 830 | err = PTR_ERR(old); |
| 831 | break; |
| 832 | } |
Harvey Harrison | 7719e43 | 2008-04-27 02:39:56 -0700 | [diff] [blame] | 833 | new = audit_unpack_string(&bufp, &msglen, sizes[1]); |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 834 | if (IS_ERR(new)) { |
| 835 | err = PTR_ERR(new); |
| 836 | kfree(old); |
| 837 | break; |
| 838 | } |
| 839 | /* OK, here comes... */ |
| 840 | err = audit_tag_tree(old, new); |
| 841 | |
Eric W. Biederman | 860c0aa | 2012-09-11 00:24:49 -0700 | [diff] [blame] | 842 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, |
| 843 | loginuid, sessionid, sid); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 844 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 845 | audit_log_format(ab, " op=make_equiv old="); |
| 846 | audit_log_untrustedstring(ab, old); |
| 847 | audit_log_format(ab, " new="); |
| 848 | audit_log_untrustedstring(ab, new); |
| 849 | audit_log_format(ab, " res=%d", !err); |
| 850 | audit_log_end(ab); |
| 851 | kfree(old); |
| 852 | kfree(new); |
| 853 | break; |
| 854 | } |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 855 | case AUDIT_SIGNAL_INFO: |
Eric Paris | 939cbf2 | 2009-09-23 13:46:00 -0400 | [diff] [blame] | 856 | len = 0; |
| 857 | if (audit_sig_sid) { |
| 858 | err = security_secid_to_secctx(audit_sig_sid, &ctx, &len); |
| 859 | if (err) |
| 860 | return err; |
| 861 | } |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 862 | sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL); |
| 863 | if (!sig_data) { |
Eric Paris | 939cbf2 | 2009-09-23 13:46:00 -0400 | [diff] [blame] | 864 | if (audit_sig_sid) |
| 865 | security_release_secctx(ctx, len); |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 866 | return -ENOMEM; |
| 867 | } |
Eric W. Biederman | cca080d | 2012-02-07 16:53:48 -0800 | [diff] [blame] | 868 | sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid); |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 869 | sig_data->pid = audit_sig_pid; |
Eric Paris | 939cbf2 | 2009-09-23 13:46:00 -0400 | [diff] [blame] | 870 | if (audit_sig_sid) { |
| 871 | memcpy(sig_data->ctx, ctx, len); |
| 872 | security_release_secctx(ctx, len); |
| 873 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 874 | audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_SIGNAL_INFO, |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 875 | 0, 0, sig_data, sizeof(*sig_data) + len); |
| 876 | kfree(sig_data); |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 877 | break; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 878 | case AUDIT_TTY_GET: { |
| 879 | struct audit_tty_status s; |
Eric W. Biederman | 8aa14b6 | 2012-09-10 23:43:14 -0700 | [diff] [blame] | 880 | struct task_struct *tsk = current; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 881 | |
Eric W. Biederman | 8aa14b6 | 2012-09-10 23:43:14 -0700 | [diff] [blame] | 882 | spin_lock_irq(&tsk->sighand->siglock); |
| 883 | s.enabled = tsk->signal->audit_tty != 0; |
| 884 | spin_unlock_irq(&tsk->sighand->siglock); |
Thomas Gleixner | 2070320 | 2009-12-09 14:19:35 +0000 | [diff] [blame] | 885 | |
Linus Torvalds | aecdc33 | 2012-10-02 13:38:27 -0700 | [diff] [blame] | 886 | audit_send_reply(NETLINK_CB(skb).portid, seq, |
Eric W. Biederman | 8aa14b6 | 2012-09-10 23:43:14 -0700 | [diff] [blame] | 887 | AUDIT_TTY_GET, 0, 0, &s, sizeof(s)); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 888 | break; |
| 889 | } |
| 890 | case AUDIT_TTY_SET: { |
| 891 | struct audit_tty_status *s; |
Eric W. Biederman | 8aa14b6 | 2012-09-10 23:43:14 -0700 | [diff] [blame] | 892 | struct task_struct *tsk = current; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 893 | |
| 894 | if (nlh->nlmsg_len < sizeof(struct audit_tty_status)) |
| 895 | return -EINVAL; |
| 896 | s = data; |
| 897 | if (s->enabled != 0 && s->enabled != 1) |
| 898 | return -EINVAL; |
Eric W. Biederman | 8aa14b6 | 2012-09-10 23:43:14 -0700 | [diff] [blame] | 899 | |
| 900 | spin_lock_irq(&tsk->sighand->siglock); |
| 901 | tsk->signal->audit_tty = s->enabled != 0; |
| 902 | spin_unlock_irq(&tsk->sighand->siglock); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 903 | break; |
| 904 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | default: |
| 906 | err = -EINVAL; |
| 907 | break; |
| 908 | } |
| 909 | |
| 910 | return err < 0 ? err : 0; |
| 911 | } |
| 912 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 913 | /* |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 914 | * Get message from skb. Each message is processed by audit_receive_msg. |
| 915 | * Malformed skbs with wrong length are discarded silently. |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 916 | */ |
Herbert Xu | 2a0a6eb | 2005-05-03 14:55:09 -0700 | [diff] [blame] | 917 | static void audit_receive_skb(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | { |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 919 | struct nlmsghdr *nlh; |
| 920 | /* |
| 921 | * len MUST be signed for NLMSG_NEXT to be able to dec it below 0 |
| 922 | * if the nlmsg_len was not aligned |
| 923 | */ |
| 924 | int len; |
| 925 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 927 | nlh = nlmsg_hdr(skb); |
| 928 | len = skb->len; |
| 929 | |
| 930 | while (NLMSG_OK(nlh, len)) { |
| 931 | err = audit_receive_msg(skb, nlh); |
| 932 | /* if err or if this message says it wants a response */ |
| 933 | if (err || (nlh->nlmsg_flags & NLM_F_ACK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | netlink_ack(skb, nlh, err); |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 935 | |
| 936 | nlh = NLMSG_NEXT(nlh, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | } |
| 939 | |
| 940 | /* Receive messages from netlink socket. */ |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 941 | static void audit_receive(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | { |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 943 | mutex_lock(&audit_cmd_mutex); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 944 | audit_receive_skb(skb); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 945 | mutex_unlock(&audit_cmd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
| 947 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | /* Initialize audit support at boot time. */ |
| 949 | static int __init audit_init(void) |
| 950 | { |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 951 | int i; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 952 | struct netlink_kernel_cfg cfg = { |
| 953 | .input = audit_receive, |
| 954 | }; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 955 | |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 956 | if (audit_initialized == AUDIT_DISABLED) |
| 957 | return 0; |
| 958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | printk(KERN_INFO "audit: initializing netlink socket (%s)\n", |
| 960 | audit_default ? "enabled" : "disabled"); |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 961 | audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, &cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | if (!audit_sock) |
| 963 | audit_panic("cannot initialize netlink socket"); |
Amy Griffis | 71e1c78 | 2006-03-06 22:40:05 -0500 | [diff] [blame] | 964 | else |
| 965 | audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
Richard Guy Briggs | 6ff5e45 | 2013-01-24 13:15:12 -0500 | [diff] [blame] | 967 | kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd"); |
| 968 | if (IS_ERR(kauditd_task)) |
| 969 | return PTR_ERR(kauditd_task); |
| 970 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 971 | skb_queue_head_init(&audit_skb_queue); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 972 | skb_queue_head_init(&audit_skb_hold_queue); |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 973 | audit_initialized = AUDIT_INITIALIZED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | audit_enabled = audit_default; |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 975 | audit_ever_enabled |= !!audit_default; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 976 | |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 977 | audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized"); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 978 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 979 | for (i = 0; i < AUDIT_INODE_BUCKETS; i++) |
| 980 | INIT_LIST_HEAD(&audit_inode_hash[i]); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 981 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | return 0; |
| 983 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | __initcall(audit_init); |
| 985 | |
| 986 | /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */ |
| 987 | static int __init audit_enable(char *str) |
| 988 | { |
| 989 | audit_default = !!simple_strtol(str, NULL, 0); |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 990 | if (!audit_default) |
| 991 | audit_initialized = AUDIT_DISABLED; |
| 992 | |
| 993 | printk(KERN_INFO "audit: %s", audit_default ? "enabled" : "disabled"); |
| 994 | |
| 995 | if (audit_initialized == AUDIT_INITIALIZED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | audit_enabled = audit_default; |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 997 | audit_ever_enabled |= !!audit_default; |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 998 | } else if (audit_initialized == AUDIT_UNINITIALIZED) { |
| 999 | printk(" (after initialization)"); |
| 1000 | } else { |
| 1001 | printk(" (until reboot)"); |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 1002 | } |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1003 | printk("\n"); |
| 1004 | |
OGAWA Hirofumi | 9b41046 | 2006-03-31 02:30:33 -0800 | [diff] [blame] | 1005 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | } |
| 1007 | |
| 1008 | __setup("audit=", audit_enable); |
| 1009 | |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1010 | static void audit_buffer_free(struct audit_buffer *ab) |
| 1011 | { |
| 1012 | unsigned long flags; |
| 1013 | |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1014 | if (!ab) |
| 1015 | return; |
| 1016 | |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1017 | if (ab->skb) |
| 1018 | kfree_skb(ab->skb); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1019 | |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1020 | spin_lock_irqsave(&audit_freelist_lock, flags); |
Serge E. Hallyn | 5d136a0 | 2006-04-27 16:45:14 -0500 | [diff] [blame] | 1021 | if (audit_freelist_count > AUDIT_MAXFREE) |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1022 | kfree(ab); |
Serge E. Hallyn | 5d136a0 | 2006-04-27 16:45:14 -0500 | [diff] [blame] | 1023 | else { |
| 1024 | audit_freelist_count++; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1025 | list_add(&ab->list, &audit_freelist); |
Serge E. Hallyn | 5d136a0 | 2006-04-27 16:45:14 -0500 | [diff] [blame] | 1026 | } |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1027 | spin_unlock_irqrestore(&audit_freelist_lock, flags); |
| 1028 | } |
| 1029 | |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 1030 | static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1031 | gfp_t gfp_mask, int type) |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1032 | { |
| 1033 | unsigned long flags; |
| 1034 | struct audit_buffer *ab = NULL; |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 1035 | struct nlmsghdr *nlh; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1036 | |
| 1037 | spin_lock_irqsave(&audit_freelist_lock, flags); |
| 1038 | if (!list_empty(&audit_freelist)) { |
| 1039 | ab = list_entry(audit_freelist.next, |
| 1040 | struct audit_buffer, list); |
| 1041 | list_del(&ab->list); |
| 1042 | --audit_freelist_count; |
| 1043 | } |
| 1044 | spin_unlock_irqrestore(&audit_freelist_lock, flags); |
| 1045 | |
| 1046 | if (!ab) { |
David Woodhouse | 4332bdd | 2005-05-06 15:59:57 +0100 | [diff] [blame] | 1047 | ab = kmalloc(sizeof(*ab), gfp_mask); |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1048 | if (!ab) |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1049 | goto err; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1050 | } |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1051 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1052 | ab->ctx = ctx; |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1053 | ab->gfp_mask = gfp_mask; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1054 | |
| 1055 | ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask); |
| 1056 | if (!ab->skb) |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 1057 | goto err; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1058 | |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 1059 | nlh = nlmsg_put(ab->skb, 0, 0, type, 0, 0); |
| 1060 | if (!nlh) |
| 1061 | goto out_kfree_skb; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1062 | |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1063 | return ab; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1064 | |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 1065 | out_kfree_skb: |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1066 | kfree_skb(ab->skb); |
| 1067 | ab->skb = NULL; |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1068 | err: |
| 1069 | audit_buffer_free(ab); |
| 1070 | return NULL; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1071 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1073 | /** |
| 1074 | * audit_serial - compute a serial number for the audit record |
| 1075 | * |
| 1076 | * Compute a serial number for the audit record. Audit records are |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1077 | * written to user-space as soon as they are generated, so a complete |
| 1078 | * audit record may be written in several pieces. The timestamp of the |
| 1079 | * record and this serial number are used by the user-space tools to |
| 1080 | * determine which pieces belong to the same audit record. The |
| 1081 | * (timestamp,serial) tuple is unique for each syscall and is live from |
| 1082 | * syscall entry to syscall exit. |
| 1083 | * |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1084 | * NOTE: Another possibility is to store the formatted records off the |
| 1085 | * audit context (for those records that have a context), and emit them |
| 1086 | * all at syscall exit. However, this could delay the reporting of |
| 1087 | * significant errors until syscall exit (or never, if the system |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1088 | * halts). |
| 1089 | */ |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1090 | unsigned int audit_serial(void) |
| 1091 | { |
Ingo Molnar | 34af946 | 2006-06-27 02:53:55 -0700 | [diff] [blame] | 1092 | static DEFINE_SPINLOCK(serial_lock); |
David Woodhouse | d5b454f | 2005-07-15 12:56:03 +0100 | [diff] [blame] | 1093 | static unsigned int serial = 0; |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1094 | |
David Woodhouse | d5b454f | 2005-07-15 12:56:03 +0100 | [diff] [blame] | 1095 | unsigned long flags; |
| 1096 | unsigned int ret; |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1097 | |
David Woodhouse | d5b454f | 2005-07-15 12:56:03 +0100 | [diff] [blame] | 1098 | spin_lock_irqsave(&serial_lock, flags); |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1099 | do { |
David Woodhouse | ce625a8 | 2005-07-18 14:24:46 -0400 | [diff] [blame] | 1100 | ret = ++serial; |
| 1101 | } while (unlikely(!ret)); |
David Woodhouse | d5b454f | 2005-07-15 12:56:03 +0100 | [diff] [blame] | 1102 | spin_unlock_irqrestore(&serial_lock, flags); |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1103 | |
David Woodhouse | d5b454f | 2005-07-15 12:56:03 +0100 | [diff] [blame] | 1104 | return ret; |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1105 | } |
| 1106 | |
Daniel Walker | 5600b89 | 2007-10-18 03:06:10 -0700 | [diff] [blame] | 1107 | static inline void audit_get_stamp(struct audit_context *ctx, |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1108 | struct timespec *t, unsigned int *serial) |
| 1109 | { |
Al Viro | 48887e6 | 2008-12-06 01:05:50 -0500 | [diff] [blame] | 1110 | if (!ctx || !auditsc_get_stamp(ctx, t, serial)) { |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1111 | *t = CURRENT_TIME; |
| 1112 | *serial = audit_serial(); |
| 1113 | } |
| 1114 | } |
| 1115 | |
Andrew Morton | 8291991 | 2013-01-11 14:32:11 -0800 | [diff] [blame] | 1116 | /* |
| 1117 | * Wait for auditd to drain the queue a little |
| 1118 | */ |
| 1119 | static void wait_for_auditd(unsigned long sleep_time) |
| 1120 | { |
| 1121 | DECLARE_WAITQUEUE(wait, current); |
| 1122 | set_current_state(TASK_INTERRUPTIBLE); |
| 1123 | add_wait_queue(&audit_backlog_wait, &wait); |
| 1124 | |
| 1125 | if (audit_backlog_limit && |
| 1126 | skb_queue_len(&audit_skb_queue) > audit_backlog_limit) |
| 1127 | schedule_timeout(sleep_time); |
| 1128 | |
| 1129 | __set_current_state(TASK_RUNNING); |
| 1130 | remove_wait_queue(&audit_backlog_wait, &wait); |
| 1131 | } |
| 1132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | /* Obtain an audit buffer. This routine does locking to obtain the |
| 1134 | * audit buffer, but then no locking is required for calls to |
| 1135 | * audit_log_*format. If the tsk is a task that is currently in a |
| 1136 | * syscall, then the syscall is marked as auditable and an audit record |
| 1137 | * will be written at syscall exit. If there is no associated task, tsk |
| 1138 | * should be NULL. */ |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1139 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1140 | /** |
| 1141 | * audit_log_start - obtain an audit buffer |
| 1142 | * @ctx: audit_context (may be NULL) |
| 1143 | * @gfp_mask: type of allocation |
| 1144 | * @type: audit message type |
| 1145 | * |
| 1146 | * Returns audit_buffer pointer on success or NULL on error. |
| 1147 | * |
| 1148 | * Obtain an audit buffer. This routine does locking to obtain the |
| 1149 | * audit buffer, but then no locking is required for calls to |
| 1150 | * audit_log_*format. If the task (ctx) is a task that is currently in a |
| 1151 | * syscall, then the syscall is marked as auditable and an audit record |
| 1152 | * will be written at syscall exit. If there is no associated task, then |
| 1153 | * task context (ctx) should be NULL. |
| 1154 | */ |
Al Viro | 9796fdd | 2005-10-21 03:22:03 -0400 | [diff] [blame] | 1155 | 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] | 1156 | int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | { |
| 1158 | struct audit_buffer *ab = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | struct timespec t; |
Andrew Morton | ef00be0 | 2008-01-10 11:02:39 -0800 | [diff] [blame] | 1160 | unsigned int uninitialized_var(serial); |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1161 | int reserve; |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 1162 | unsigned long timeout_start = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1164 | if (audit_initialized != AUDIT_INITIALIZED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | return NULL; |
| 1166 | |
Dustin Kirkland | c8edc80 | 2005-11-03 16:12:36 +0000 | [diff] [blame] | 1167 | if (unlikely(audit_filter_type(type))) |
| 1168 | return NULL; |
| 1169 | |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1170 | if (gfp_mask & __GFP_WAIT) |
| 1171 | reserve = 0; |
| 1172 | else |
Daniel Walker | 5600b89 | 2007-10-18 03:06:10 -0700 | [diff] [blame] | 1173 | reserve = 5; /* Allow atomic callers to go up to five |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1174 | entries over the normal backlog limit */ |
| 1175 | |
| 1176 | while (audit_backlog_limit |
| 1177 | && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) { |
Andrew Morton | 8291991 | 2013-01-11 14:32:11 -0800 | [diff] [blame] | 1178 | if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) { |
| 1179 | unsigned long sleep_time; |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 1180 | |
Andrew Morton | 8291991 | 2013-01-11 14:32:11 -0800 | [diff] [blame] | 1181 | sleep_time = timeout_start + audit_backlog_wait_time - |
| 1182 | jiffies; |
| 1183 | if ((long)sleep_time > 0) |
| 1184 | wait_for_auditd(sleep_time); |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 1185 | continue; |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1186 | } |
Eric Paris | 320f1b1 | 2008-01-23 22:55:05 -0500 | [diff] [blame] | 1187 | if (audit_rate_check() && printk_ratelimit()) |
David Woodhouse | fb19b4c | 2005-05-19 14:55:56 +0100 | [diff] [blame] | 1188 | printk(KERN_WARNING |
| 1189 | "audit: audit_backlog=%d > " |
| 1190 | "audit_backlog_limit=%d\n", |
| 1191 | skb_queue_len(&audit_skb_queue), |
| 1192 | audit_backlog_limit); |
| 1193 | audit_log_lost("backlog limit exceeded"); |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 1194 | audit_backlog_wait_time = audit_backlog_wait_overflow; |
| 1195 | wake_up(&audit_backlog_wait); |
David Woodhouse | fb19b4c | 2005-05-19 14:55:56 +0100 | [diff] [blame] | 1196 | return NULL; |
| 1197 | } |
| 1198 | |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1199 | ab = audit_buffer_alloc(ctx, gfp_mask, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | if (!ab) { |
| 1201 | audit_log_lost("out of memory in audit_log_start"); |
| 1202 | return NULL; |
| 1203 | } |
| 1204 | |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1205 | audit_get_stamp(ab->ctx, &t, &serial); |
Chris Wright | 197c69c | 2005-05-11 10:54:05 +0100 | [diff] [blame] | 1206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | audit_log_format(ab, "audit(%lu.%03lu:%u): ", |
| 1208 | t.tv_sec, t.tv_nsec/1000000, serial); |
| 1209 | return ab; |
| 1210 | } |
| 1211 | |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1212 | /** |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1213 | * audit_expand - expand skb in the audit buffer |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1214 | * @ab: audit_buffer |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1215 | * @extra: space to add at tail of the skb |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1216 | * |
| 1217 | * Returns 0 (no space) on failed expansion, or available space if |
| 1218 | * successful. |
| 1219 | */ |
David Woodhouse | e3b926b | 2005-05-10 18:56:08 +0100 | [diff] [blame] | 1220 | static inline int audit_expand(struct audit_buffer *ab, int extra) |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1221 | { |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1222 | struct sk_buff *skb = ab->skb; |
Herbert Xu | 406a1d8 | 2008-01-28 20:47:09 -0800 | [diff] [blame] | 1223 | int oldtail = skb_tailroom(skb); |
| 1224 | int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask); |
| 1225 | int newtail = skb_tailroom(skb); |
| 1226 | |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1227 | if (ret < 0) { |
| 1228 | audit_log_lost("out of memory in audit_expand"); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1229 | return 0; |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1230 | } |
Herbert Xu | 406a1d8 | 2008-01-28 20:47:09 -0800 | [diff] [blame] | 1231 | |
| 1232 | skb->truesize += newtail - oldtail; |
| 1233 | return newtail; |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1234 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1236 | /* |
| 1237 | * 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] | 1238 | * room in the audit buffer, more room will be allocated and vsnprint |
| 1239 | * will be called a second time. Currently, we assume that a printk |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1240 | * can't format message larger than 1024 bytes, so we don't either. |
| 1241 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | static void audit_log_vformat(struct audit_buffer *ab, const char *fmt, |
| 1243 | va_list args) |
| 1244 | { |
| 1245 | int len, avail; |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1246 | struct sk_buff *skb; |
David Woodhouse | eecb0a7 | 2005-05-10 18:58:51 +0100 | [diff] [blame] | 1247 | va_list args2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | |
| 1249 | if (!ab) |
| 1250 | return; |
| 1251 | |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1252 | BUG_ON(!ab->skb); |
| 1253 | skb = ab->skb; |
| 1254 | avail = skb_tailroom(skb); |
| 1255 | if (avail == 0) { |
David Woodhouse | e3b926b | 2005-05-10 18:56:08 +0100 | [diff] [blame] | 1256 | avail = audit_expand(ab, AUDIT_BUFSIZ); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1257 | if (!avail) |
| 1258 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | } |
David Woodhouse | eecb0a7 | 2005-05-10 18:58:51 +0100 | [diff] [blame] | 1260 | va_copy(args2, args); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1261 | len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | if (len >= avail) { |
| 1263 | /* The printk buffer is 1024 bytes long, so if we get |
| 1264 | * here and AUDIT_BUFSIZ is at least 1024, then we can |
| 1265 | * log everything that printk could have logged. */ |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1266 | avail = audit_expand(ab, |
| 1267 | max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail)); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1268 | if (!avail) |
Jesper Juhl | a0e86bd | 2012-01-08 22:44:29 +0100 | [diff] [blame] | 1269 | goto out_va_end; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1270 | len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | } |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1272 | if (len > 0) |
| 1273 | skb_put(skb, len); |
Jesper Juhl | a0e86bd | 2012-01-08 22:44:29 +0100 | [diff] [blame] | 1274 | out_va_end: |
| 1275 | va_end(args2); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1276 | out: |
| 1277 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | } |
| 1279 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1280 | /** |
| 1281 | * audit_log_format - format a message into the audit buffer. |
| 1282 | * @ab: audit_buffer |
| 1283 | * @fmt: format string |
| 1284 | * @...: optional parameters matching @fmt string |
| 1285 | * |
| 1286 | * All the work is done in audit_log_vformat. |
| 1287 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | void audit_log_format(struct audit_buffer *ab, const char *fmt, ...) |
| 1289 | { |
| 1290 | va_list args; |
| 1291 | |
| 1292 | if (!ab) |
| 1293 | return; |
| 1294 | va_start(args, fmt); |
| 1295 | audit_log_vformat(ab, fmt, args); |
| 1296 | va_end(args); |
| 1297 | } |
| 1298 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1299 | /** |
| 1300 | * audit_log_hex - convert a buffer to hex and append it to the audit skb |
| 1301 | * @ab: the audit_buffer |
| 1302 | * @buf: buffer to convert to hex |
| 1303 | * @len: length of @buf to be converted |
| 1304 | * |
| 1305 | * No return value; failure to expand is silently ignored. |
| 1306 | * |
| 1307 | * This function will take the passed buf and convert it into a string of |
| 1308 | * ascii hex digits. The new string is placed onto the skb. |
| 1309 | */ |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1310 | 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] | 1311 | size_t len) |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1312 | { |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1313 | int i, avail, new_len; |
| 1314 | unsigned char *ptr; |
| 1315 | struct sk_buff *skb; |
| 1316 | static const unsigned char *hex = "0123456789ABCDEF"; |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1317 | |
Amy Griffis | 8ef2d30 | 2006-09-07 17:03:02 -0400 | [diff] [blame] | 1318 | if (!ab) |
| 1319 | return; |
| 1320 | |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1321 | BUG_ON(!ab->skb); |
| 1322 | skb = ab->skb; |
| 1323 | avail = skb_tailroom(skb); |
| 1324 | new_len = len<<1; |
| 1325 | if (new_len >= avail) { |
| 1326 | /* Round the buffer request up to the next multiple */ |
| 1327 | new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1); |
| 1328 | avail = audit_expand(ab, new_len); |
| 1329 | if (!avail) |
| 1330 | return; |
| 1331 | } |
| 1332 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1333 | ptr = skb_tail_pointer(skb); |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1334 | for (i=0; i<len; i++) { |
| 1335 | *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */ |
| 1336 | *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */ |
| 1337 | } |
| 1338 | *ptr = 0; |
| 1339 | skb_put(skb, len << 1); /* new string is twice the old string */ |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1340 | } |
| 1341 | |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1342 | /* |
| 1343 | * Format a string of no more than slen characters into the audit buffer, |
| 1344 | * enclosed in quote marks. |
| 1345 | */ |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1346 | void audit_log_n_string(struct audit_buffer *ab, const char *string, |
| 1347 | size_t slen) |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1348 | { |
| 1349 | int avail, new_len; |
| 1350 | unsigned char *ptr; |
| 1351 | struct sk_buff *skb; |
| 1352 | |
Amy Griffis | 8ef2d30 | 2006-09-07 17:03:02 -0400 | [diff] [blame] | 1353 | if (!ab) |
| 1354 | return; |
| 1355 | |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1356 | BUG_ON(!ab->skb); |
| 1357 | skb = ab->skb; |
| 1358 | avail = skb_tailroom(skb); |
| 1359 | new_len = slen + 3; /* enclosing quotes + null terminator */ |
| 1360 | if (new_len > avail) { |
| 1361 | avail = audit_expand(ab, new_len); |
| 1362 | if (!avail) |
| 1363 | return; |
| 1364 | } |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1365 | ptr = skb_tail_pointer(skb); |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1366 | *ptr++ = '"'; |
| 1367 | memcpy(ptr, string, slen); |
| 1368 | ptr += slen; |
| 1369 | *ptr++ = '"'; |
| 1370 | *ptr = 0; |
| 1371 | skb_put(skb, slen + 2); /* don't include null terminator */ |
| 1372 | } |
| 1373 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1374 | /** |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1375 | * 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] | 1376 | * @string: string to be checked |
| 1377 | * @len: max length of the string to check |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1378 | */ |
| 1379 | int audit_string_contains_control(const char *string, size_t len) |
| 1380 | { |
| 1381 | const unsigned char *p; |
Miloslav Trmac | b3897f5 | 2009-03-19 09:48:27 -0400 | [diff] [blame] | 1382 | for (p = string; p < (const unsigned char *)string + len; p++) { |
Vesa-Matti J Kari | 1d6c964 | 2008-07-23 00:06:13 +0300 | [diff] [blame] | 1383 | if (*p == '"' || *p < 0x21 || *p > 0x7e) |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1384 | return 1; |
| 1385 | } |
| 1386 | return 0; |
| 1387 | } |
| 1388 | |
| 1389 | /** |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1390 | * audit_log_n_untrustedstring - log a string that may contain random characters |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1391 | * @ab: audit_buffer |
Dave Jones | f706d5d | 2008-03-28 14:15:56 -0700 | [diff] [blame] | 1392 | * @len: length of string (not including trailing null) |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1393 | * @string: string to be logged |
| 1394 | * |
| 1395 | * This code will escape a string that is passed to it if the string |
| 1396 | * contains a control character, unprintable character, double quote mark, |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1397 | * 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] | 1398 | * Strings that are escaped are printed in hex (2 digits per char). |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1399 | * |
| 1400 | * The caller specifies the number of characters in the string to log, which may |
| 1401 | * or may not be the entire string. |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1402 | */ |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1403 | void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string, |
| 1404 | size_t len) |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1405 | { |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1406 | if (audit_string_contains_control(string, len)) |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1407 | audit_log_n_hex(ab, string, len); |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1408 | else |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1409 | audit_log_n_string(ab, string, len); |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1410 | } |
| 1411 | |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1412 | /** |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1413 | * audit_log_untrustedstring - log a string that may contain random characters |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1414 | * @ab: audit_buffer |
| 1415 | * @string: string to be logged |
| 1416 | * |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1417 | * Same as audit_log_n_untrustedstring(), except that strlen is used to |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1418 | * determine string length. |
| 1419 | */ |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1420 | void audit_log_untrustedstring(struct audit_buffer *ab, const char *string) |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1421 | { |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1422 | audit_log_n_untrustedstring(ab, string, strlen(string)); |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1423 | } |
| 1424 | |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1425 | /* This is a helper-function to print the escaped d_path */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | void audit_log_d_path(struct audit_buffer *ab, const char *prefix, |
Al Viro | 66b3fad | 2012-03-14 21:48:20 -0400 | [diff] [blame] | 1427 | const struct path *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | { |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1429 | char *p, *pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1431 | if (prefix) |
Kees Cook | c158a35 | 2012-01-06 14:07:10 -0800 | [diff] [blame] | 1432 | audit_log_format(ab, "%s", prefix); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1434 | /* We will allow 11 spaces for ' (deleted)' to be appended */ |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1435 | pathname = kmalloc(PATH_MAX+11, ab->gfp_mask); |
| 1436 | if (!pathname) { |
Eric Paris | def5754 | 2009-03-10 18:00:14 -0400 | [diff] [blame] | 1437 | audit_log_string(ab, "<no_memory>"); |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1438 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | } |
Jan Blunck | cf28b48 | 2008-02-14 19:38:44 -0800 | [diff] [blame] | 1440 | p = d_path(path, pathname, PATH_MAX+11); |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1441 | if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */ |
| 1442 | /* FIXME: can we save some information here? */ |
Eric Paris | def5754 | 2009-03-10 18:00:14 -0400 | [diff] [blame] | 1443 | audit_log_string(ab, "<too_long>"); |
Daniel Walker | 5600b89 | 2007-10-18 03:06:10 -0700 | [diff] [blame] | 1444 | } else |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1445 | audit_log_untrustedstring(ab, p); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1446 | kfree(pathname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | } |
| 1448 | |
Eric Paris | 9d96098 | 2009-06-11 14:31:37 -0400 | [diff] [blame] | 1449 | void audit_log_key(struct audit_buffer *ab, char *key) |
| 1450 | { |
| 1451 | audit_log_format(ab, " key="); |
| 1452 | if (key) |
| 1453 | audit_log_untrustedstring(ab, key); |
| 1454 | else |
| 1455 | audit_log_format(ab, "(null)"); |
| 1456 | } |
| 1457 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1458 | /** |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1459 | * audit_log_link_denied - report a link restriction denial |
| 1460 | * @operation: specific link opreation |
| 1461 | * @link: the path that triggered the restriction |
| 1462 | */ |
| 1463 | void audit_log_link_denied(const char *operation, struct path *link) |
| 1464 | { |
| 1465 | struct audit_buffer *ab; |
| 1466 | |
| 1467 | ab = audit_log_start(current->audit_context, GFP_KERNEL, |
| 1468 | AUDIT_ANOM_LINK); |
Sasha Levin | d1c7d97 | 2012-10-04 19:57:31 -0400 | [diff] [blame] | 1469 | if (!ab) |
| 1470 | return; |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1471 | audit_log_format(ab, "op=%s action=denied", operation); |
| 1472 | audit_log_format(ab, " pid=%d comm=", current->pid); |
| 1473 | audit_log_untrustedstring(ab, current->comm); |
| 1474 | audit_log_d_path(ab, " path=", link); |
| 1475 | audit_log_format(ab, " dev="); |
| 1476 | audit_log_untrustedstring(ab, link->dentry->d_inode->i_sb->s_id); |
| 1477 | audit_log_format(ab, " ino=%lu", link->dentry->d_inode->i_ino); |
| 1478 | audit_log_end(ab); |
| 1479 | } |
| 1480 | |
| 1481 | /** |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1482 | * audit_log_end - end one audit record |
| 1483 | * @ab: the audit_buffer |
| 1484 | * |
| 1485 | * The netlink_* functions cannot be called inside an irq context, so |
| 1486 | * 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] | 1487 | * 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] | 1488 | * any context. |
| 1489 | */ |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1490 | void audit_log_end(struct audit_buffer *ab) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | if (!ab) |
| 1493 | return; |
| 1494 | if (!audit_rate_check()) { |
| 1495 | audit_log_lost("rate limit exceeded"); |
| 1496 | } else { |
Steve Grubb | 8d07a67 | 2008-02-21 16:59:22 -0500 | [diff] [blame] | 1497 | struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 1498 | nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0); |
| 1499 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1500 | if (audit_pid) { |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1501 | skb_queue_tail(&audit_skb_queue, ab->skb); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1502 | wake_up_interruptible(&kauditd_wait); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 1503 | } else { |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1504 | audit_printk_skb(ab->skb); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1505 | } |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 1506 | ab->skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | } |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1508 | audit_buffer_free(ab); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | } |
| 1510 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1511 | /** |
| 1512 | * audit_log - Log an audit record |
| 1513 | * @ctx: audit context |
| 1514 | * @gfp_mask: type of allocation |
| 1515 | * @type: audit message type |
| 1516 | * @fmt: format string to use |
| 1517 | * @...: variable parameters matching the format string |
| 1518 | * |
| 1519 | * This is a convenience function that calls audit_log_start, |
| 1520 | * audit_log_vformat, and audit_log_end. It may be called |
| 1521 | * in any context. |
| 1522 | */ |
Daniel Walker | 5600b89 | 2007-10-18 03:06:10 -0700 | [diff] [blame] | 1523 | 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] | 1524 | const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | { |
| 1526 | struct audit_buffer *ab; |
| 1527 | va_list args; |
| 1528 | |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1529 | ab = audit_log_start(ctx, gfp_mask, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | if (ab) { |
| 1531 | va_start(args, fmt); |
| 1532 | audit_log_vformat(ab, fmt, args); |
| 1533 | va_end(args); |
| 1534 | audit_log_end(ab); |
| 1535 | } |
| 1536 | } |
lorenzo@gnu.org | bf45da9 | 2006-03-09 00:33:47 +0100 | [diff] [blame] | 1537 | |
Mr Dash Four | 131ad62 | 2011-06-30 13:31:57 +0200 | [diff] [blame] | 1538 | #ifdef CONFIG_SECURITY |
| 1539 | /** |
| 1540 | * audit_log_secctx - Converts and logs SELinux context |
| 1541 | * @ab: audit_buffer |
| 1542 | * @secid: security number |
| 1543 | * |
| 1544 | * This is a helper function that calls security_secid_to_secctx to convert |
| 1545 | * secid to secctx and then adds the (converted) SELinux context to the audit |
| 1546 | * log by calling audit_log_format, thus also preventing leak of internal secid |
| 1547 | * to userspace. If secid cannot be converted audit_panic is called. |
| 1548 | */ |
| 1549 | void audit_log_secctx(struct audit_buffer *ab, u32 secid) |
| 1550 | { |
| 1551 | u32 len; |
| 1552 | char *secctx; |
| 1553 | |
| 1554 | if (security_secid_to_secctx(secid, &secctx, &len)) { |
| 1555 | audit_panic("Cannot convert secid to context"); |
| 1556 | } else { |
| 1557 | audit_log_format(ab, " obj=%s", secctx); |
| 1558 | security_release_secctx(secctx, len); |
| 1559 | } |
| 1560 | } |
| 1561 | EXPORT_SYMBOL(audit_log_secctx); |
| 1562 | #endif |
| 1563 | |
lorenzo@gnu.org | bf45da9 | 2006-03-09 00:33:47 +0100 | [diff] [blame] | 1564 | EXPORT_SYMBOL(audit_log_start); |
| 1565 | EXPORT_SYMBOL(audit_log_end); |
| 1566 | EXPORT_SYMBOL(audit_log_format); |
| 1567 | EXPORT_SYMBOL(audit_log); |