1/* audit -- definition of audit_context structure and supporting types 2 * 3 * Copyright 2003-2004 Red Hat, Inc. 4 * Copyright 2005 Hewlett-Packard Development Company, L.P. 5 * Copyright 2005 IBM Corporation 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22#include <linux/fs.h> 23#include <linux/audit.h> 24#include <linux/skbuff.h> 25#include <uapi/linux/mqueue.h> 26 27/* AUDIT_NAMES is the number of slots we reserve in the audit_context 28 * for saving names from getname(). If we get more names we will allocate 29 * a name dynamically and also add those to the list anchored by names_list. */ 30#define AUDIT_NAMES 5 31 32/* At task start time, the audit_state is set in the audit_context using 33 a per-task filter. At syscall entry, the audit_state is augmented by 34 the syscall filter. */ 35enum audit_state { 36 AUDIT_DISABLED, /* Do not create per-task audit_context. 37 * No syscall-specific audit records can 38 * be generated. */ 39 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context, 40 * and fill it in at syscall 41 * entry time. This makes a full 42 * syscall record available if some 43 * other part of the kernel decides it 44 * should be recorded. */ 45 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context, 46 * always fill it in at syscall entry 47 * time, and always write out the audit 48 * record at syscall exit time. */ 49}; 50 51/* Rule lists */ 52struct audit_watch; 53struct audit_fsnotify_mark; 54struct audit_tree; 55struct audit_chunk; 56 57struct audit_entry { 58 struct list_head list; 59 struct rcu_head rcu; 60 struct audit_krule rule; 61}; 62 63struct audit_cap_data { 64 kernel_cap_t permitted; 65 kernel_cap_t inheritable; 66 union { 67 unsigned int fE; /* effective bit of file cap */ 68 kernel_cap_t effective; /* effective set of process */ 69 }; 70}; 71 72/* When fs/namei.c:getname() is called, we store the pointer in name and bump 73 * the refcnt in the associated filename struct. 74 * 75 * Further, in fs/namei.c:path_lookup() we store the inode and device. 76 */ 77struct audit_names { 78 struct list_head list; /* audit_context->names_list */ 79 80 struct filename *name; 81 int name_len; /* number of chars to log */ 82 bool hidden; /* don't log this record */ 83 84 unsigned long ino; 85 dev_t dev; 86 umode_t mode; 87 kuid_t uid; 88 kgid_t gid; 89 dev_t rdev; 90 u32 osid; 91 struct audit_cap_data fcap; 92 unsigned int fcap_ver; 93 unsigned char type; /* record type */ 94 /* 95 * This was an allocated audit_names and not from the array of 96 * names allocated in the task audit context. Thus this name 97 * should be freed on syscall exit. 98 */ 99 bool should_free; 100}; 101 102struct audit_proctitle { 103 int len; /* length of the cmdline field. */ 104 char *value; /* the cmdline field */ 105}; 106 107/* The per-task audit context. */ 108struct audit_context { 109 int dummy; /* must be the first element */ 110 int in_syscall; /* 1 if task is in a syscall */ 111 enum audit_state state, current_state; 112 unsigned int serial; /* serial number for record */ 113 int major; /* syscall number */ 114 struct timespec ctime; /* time of syscall entry */ 115 unsigned long argv[4]; /* syscall arguments */ 116 long return_code;/* syscall return code */ 117 u64 prio; 118 int return_valid; /* return code is valid */ 119 /* 120 * The names_list is the list of all audit_names collected during this 121 * syscall. The first AUDIT_NAMES entries in the names_list will 122 * actually be from the preallocated_names array for performance 123 * reasons. Except during allocation they should never be referenced 124 * through the preallocated_names array and should only be found/used 125 * by running the names_list. 126 */ 127 struct audit_names preallocated_names[AUDIT_NAMES]; 128 int name_count; /* total records in names_list */ 129 struct list_head names_list; /* struct audit_names->list anchor */ 130 char *filterkey; /* key for rule that triggered record */ 131 struct path pwd; 132 struct audit_aux_data *aux; 133 struct audit_aux_data *aux_pids; 134 struct sockaddr_storage *sockaddr; 135 size_t sockaddr_len; 136 /* Save things to print about task_struct */ 137 pid_t pid, ppid; 138 kuid_t uid, euid, suid, fsuid; 139 kgid_t gid, egid, sgid, fsgid; 140 unsigned long personality; 141 int arch; 142 143 pid_t target_pid; 144 kuid_t target_auid; 145 kuid_t target_uid; 146 unsigned int target_sessionid; 147 u32 target_sid; 148 char target_comm[TASK_COMM_LEN]; 149 150 struct audit_tree_refs *trees, *first_trees; 151 struct list_head killed_trees; 152 int tree_count; 153 154 int type; 155 union { 156 struct { 157 int nargs; 158 long args[6]; 159 } socketcall; 160 struct { 161 kuid_t uid; 162 kgid_t gid; 163 umode_t mode; 164 u32 osid; 165 int has_perm; 166 uid_t perm_uid; 167 gid_t perm_gid; 168 umode_t perm_mode; 169 unsigned long qbytes; 170 } ipc; 171 struct { 172 mqd_t mqdes; 173 struct mq_attr mqstat; 174 } mq_getsetattr; 175 struct { 176 mqd_t mqdes; 177 int sigev_signo; 178 } mq_notify; 179 struct { 180 mqd_t mqdes; 181 size_t msg_len; 182 unsigned int msg_prio; 183 struct timespec abs_timeout; 184 } mq_sendrecv; 185 struct { 186 int oflag; 187 umode_t mode; 188 struct mq_attr attr; 189 } mq_open; 190 struct { 191 pid_t pid; 192 struct audit_cap_data cap; 193 } capset; 194 struct { 195 int fd; 196 int flags; 197 } mmap; 198 struct { 199 int argc; 200 } execve; 201 }; 202 int fds[2]; 203 struct audit_proctitle proctitle; 204}; 205 206extern u32 audit_ever_enabled; 207 208extern void audit_copy_inode(struct audit_names *name, 209 const struct dentry *dentry, 210 const struct inode *inode); 211extern void audit_log_cap(struct audit_buffer *ab, char *prefix, 212 kernel_cap_t *cap); 213extern void audit_log_name(struct audit_context *context, 214 struct audit_names *n, struct path *path, 215 int record_num, int *call_panic); 216 217extern int audit_pid; 218 219#define AUDIT_INODE_BUCKETS 32 220extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 221 222static inline int audit_hash_ino(u32 ino) 223{ 224 return (ino & (AUDIT_INODE_BUCKETS-1)); 225} 226 227/* Indicates that audit should log the full pathname. */ 228#define AUDIT_NAME_FULL -1 229 230extern int audit_match_class(int class, unsigned syscall); 231extern int audit_comparator(const u32 left, const u32 op, const u32 right); 232extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); 233extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); 234extern int parent_len(const char *path); 235extern int audit_compare_dname_path(const char *dname, const char *path, int plen); 236extern struct sk_buff *audit_make_reply(__u32 portid, int seq, int type, 237 int done, int multi, 238 const void *payload, int size); 239extern void audit_panic(const char *message); 240 241struct audit_netlink_list { 242 __u32 portid; 243 struct net *net; 244 struct sk_buff_head q; 245}; 246 247int audit_send_list(void *); 248 249struct audit_net { 250 struct sock *nlsk; 251}; 252 253extern int selinux_audit_rule_update(void); 254 255extern struct mutex audit_filter_mutex; 256extern int audit_del_rule(struct audit_entry *); 257extern void audit_free_rule_rcu(struct rcu_head *); 258extern struct list_head audit_filter_list[]; 259 260extern struct audit_entry *audit_dupe_rule(struct audit_krule *old); 261 262extern void audit_log_d_path_exe(struct audit_buffer *ab, 263 struct mm_struct *mm); 264 265/* audit watch functions */ 266#ifdef CONFIG_AUDIT_WATCH 267extern void audit_put_watch(struct audit_watch *watch); 268extern void audit_get_watch(struct audit_watch *watch); 269extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op); 270extern int audit_add_watch(struct audit_krule *krule, struct list_head **list); 271extern void audit_remove_watch_rule(struct audit_krule *krule); 272extern char *audit_watch_path(struct audit_watch *watch); 273extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev); 274 275extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pathname, int len); 276extern char *audit_mark_path(struct audit_fsnotify_mark *mark); 277extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark); 278extern void audit_remove_mark_rule(struct audit_krule *krule); 279extern int audit_mark_compare(struct audit_fsnotify_mark *mark, unsigned long ino, dev_t dev); 280extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old); 281extern int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark); 282 283#else 284#define audit_put_watch(w) {} 285#define audit_get_watch(w) {} 286#define audit_to_watch(k, p, l, o) (-EINVAL) 287#define audit_add_watch(k, l) (-EINVAL) 288#define audit_remove_watch_rule(k) BUG() 289#define audit_watch_path(w) "" 290#define audit_watch_compare(w, i, d) 0 291 292#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL)) 293#define audit_mark_path(m) "" 294#define audit_remove_mark(m) 295#define audit_remove_mark_rule(k) 296#define audit_mark_compare(m, i, d) 0 297#define audit_exe_compare(t, m) (-EINVAL) 298#define audit_dupe_exe(n, o) (-EINVAL) 299#endif /* CONFIG_AUDIT_WATCH */ 300 301#ifdef CONFIG_AUDIT_TREE 302extern struct audit_chunk *audit_tree_lookup(const struct inode *); 303extern void audit_put_chunk(struct audit_chunk *); 304extern bool audit_tree_match(struct audit_chunk *, struct audit_tree *); 305extern int audit_make_tree(struct audit_krule *, char *, u32); 306extern int audit_add_tree_rule(struct audit_krule *); 307extern int audit_remove_tree_rule(struct audit_krule *); 308extern void audit_trim_trees(void); 309extern int audit_tag_tree(char *old, char *new); 310extern const char *audit_tree_path(struct audit_tree *); 311extern void audit_put_tree(struct audit_tree *); 312extern void audit_kill_trees(struct list_head *); 313#else 314#define audit_remove_tree_rule(rule) BUG() 315#define audit_add_tree_rule(rule) -EINVAL 316#define audit_make_tree(rule, str, op) -EINVAL 317#define audit_trim_trees() (void)0 318#define audit_put_tree(tree) (void)0 319#define audit_tag_tree(old, new) -EINVAL 320#define audit_tree_path(rule) "" /* never called */ 321#define audit_kill_trees(list) BUG() 322#endif 323 324extern char *audit_unpack_string(void **, size_t *, size_t); 325 326extern pid_t audit_sig_pid; 327extern kuid_t audit_sig_uid; 328extern u32 audit_sig_sid; 329 330#ifdef CONFIG_AUDITSYSCALL 331extern int __audit_signal_info(int sig, struct task_struct *t); 332static inline int audit_signal_info(int sig, struct task_struct *t) 333{ 334 if (unlikely((audit_pid && t->tgid == audit_pid) || 335 (audit_signals && !audit_dummy_context()))) 336 return __audit_signal_info(sig, t); 337 return 0; 338} 339extern void audit_filter_inodes(struct task_struct *, struct audit_context *); 340extern struct list_head *audit_killed_trees(void); 341#else 342#define audit_signal_info(s,t) AUDIT_DISABLED 343#define audit_filter_inodes(t,c) AUDIT_DISABLED 344#endif 345 346extern struct mutex audit_cmd_mutex; 347