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Linux/kernel/audit.h

  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 #include <linux/tty.h>
 27 
 28 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
 29  * for saving names from getname().  If we get more names we will allocate
 30  * a name dynamically and also add those to the list anchored by names_list. */
 31 #define AUDIT_NAMES     5
 32 
 33 /* At task start time, the audit_state is set in the audit_context using
 34    a per-task filter.  At syscall entry, the audit_state is augmented by
 35    the syscall filter. */
 36 enum audit_state {
 37         AUDIT_DISABLED,         /* Do not create per-task audit_context.
 38                                  * No syscall-specific audit records can
 39                                  * be generated. */
 40         AUDIT_BUILD_CONTEXT,    /* Create the per-task audit_context,
 41                                  * and fill it in at syscall
 42                                  * entry time.  This makes a full
 43                                  * syscall record available if some
 44                                  * other part of the kernel decides it
 45                                  * should be recorded. */
 46         AUDIT_RECORD_CONTEXT    /* Create the per-task audit_context,
 47                                  * always fill it in at syscall entry
 48                                  * time, and always write out the audit
 49                                  * record at syscall exit time.  */
 50 };
 51 
 52 /* Rule lists */
 53 struct audit_watch;
 54 struct audit_fsnotify_mark;
 55 struct audit_tree;
 56 struct audit_chunk;
 57 
 58 struct audit_entry {
 59         struct list_head        list;
 60         struct rcu_head         rcu;
 61         struct audit_krule      rule;
 62 };
 63 
 64 struct audit_cap_data {
 65         kernel_cap_t            permitted;
 66         kernel_cap_t            inheritable;
 67         union {
 68                 unsigned int    fE;             /* effective bit of file cap */
 69                 kernel_cap_t    effective;      /* effective set of process */
 70         };
 71 };
 72 
 73 /* When fs/namei.c:getname() is called, we store the pointer in name and bump
 74  * the refcnt in the associated filename struct.
 75  *
 76  * Further, in fs/namei.c:path_lookup() we store the inode and device.
 77  */
 78 struct audit_names {
 79         struct list_head        list;           /* audit_context->names_list */
 80 
 81         struct filename         *name;
 82         int                     name_len;       /* number of chars to log */
 83         bool                    hidden;         /* don't log this record */
 84 
 85         unsigned long           ino;
 86         dev_t                   dev;
 87         umode_t                 mode;
 88         kuid_t                  uid;
 89         kgid_t                  gid;
 90         dev_t                   rdev;
 91         u32                     osid;
 92         struct audit_cap_data   fcap;
 93         unsigned int            fcap_ver;
 94         unsigned char           type;           /* record type */
 95         /*
 96          * This was an allocated audit_names and not from the array of
 97          * names allocated in the task audit context.  Thus this name
 98          * should be freed on syscall exit.
 99          */
100         bool                    should_free;
101 };
102 
103 struct audit_proctitle {
104         int     len;    /* length of the cmdline field. */
105         char    *value; /* the cmdline field */
106 };
107 
108 /* The per-task audit context. */
109 struct audit_context {
110         int                 dummy;      /* must be the first element */
111         int                 in_syscall; /* 1 if task is in a syscall */
112         enum audit_state    state, current_state;
113         unsigned int        serial;     /* serial number for record */
114         int                 major;      /* syscall number */
115         struct timespec     ctime;      /* time of syscall entry */
116         unsigned long       argv[4];    /* syscall arguments */
117         long                return_code;/* syscall return code */
118         u64                 prio;
119         int                 return_valid; /* return code is valid */
120         /*
121          * The names_list is the list of all audit_names collected during this
122          * syscall.  The first AUDIT_NAMES entries in the names_list will
123          * actually be from the preallocated_names array for performance
124          * reasons.  Except during allocation they should never be referenced
125          * through the preallocated_names array and should only be found/used
126          * by running the names_list.
127          */
128         struct audit_names  preallocated_names[AUDIT_NAMES];
129         int                 name_count; /* total records in names_list */
130         struct list_head    names_list; /* struct audit_names->list anchor */
131         char                *filterkey; /* key for rule that triggered record */
132         struct path         pwd;
133         struct audit_aux_data *aux;
134         struct audit_aux_data *aux_pids;
135         struct sockaddr_storage *sockaddr;
136         size_t sockaddr_len;
137                                 /* Save things to print about task_struct */
138         pid_t               pid, ppid;
139         kuid_t              uid, euid, suid, fsuid;
140         kgid_t              gid, egid, sgid, fsgid;
141         unsigned long       personality;
142         int                 arch;
143 
144         pid_t               target_pid;
145         kuid_t              target_auid;
146         kuid_t              target_uid;
147         unsigned int        target_sessionid;
148         u32                 target_sid;
149         char                target_comm[TASK_COMM_LEN];
150 
151         struct audit_tree_refs *trees, *first_trees;
152         struct list_head killed_trees;
153         int tree_count;
154 
155         int type;
156         union {
157                 struct {
158                         int nargs;
159                         long args[6];
160                 } socketcall;
161                 struct {
162                         kuid_t                  uid;
163                         kgid_t                  gid;
164                         umode_t                 mode;
165                         u32                     osid;
166                         int                     has_perm;
167                         uid_t                   perm_uid;
168                         gid_t                   perm_gid;
169                         umode_t                 perm_mode;
170                         unsigned long           qbytes;
171                 } ipc;
172                 struct {
173                         mqd_t                   mqdes;
174                         struct mq_attr          mqstat;
175                 } mq_getsetattr;
176                 struct {
177                         mqd_t                   mqdes;
178                         int                     sigev_signo;
179                 } mq_notify;
180                 struct {
181                         mqd_t                   mqdes;
182                         size_t                  msg_len;
183                         unsigned int            msg_prio;
184                         struct timespec         abs_timeout;
185                 } mq_sendrecv;
186                 struct {
187                         int                     oflag;
188                         umode_t                 mode;
189                         struct mq_attr          attr;
190                 } mq_open;
191                 struct {
192                         pid_t                   pid;
193                         struct audit_cap_data   cap;
194                 } capset;
195                 struct {
196                         int                     fd;
197                         int                     flags;
198                 } mmap;
199                 struct {
200                         int                     argc;
201                 } execve;
202         };
203         int fds[2];
204         struct audit_proctitle proctitle;
205 };
206 
207 extern u32 audit_ever_enabled;
208 
209 extern void audit_copy_inode(struct audit_names *name,
210                              const struct dentry *dentry,
211                              struct inode *inode);
212 extern void audit_log_cap(struct audit_buffer *ab, char *prefix,
213                           kernel_cap_t *cap);
214 extern void audit_log_name(struct audit_context *context,
215                            struct audit_names *n, const struct path *path,
216                            int record_num, int *call_panic);
217 
218 extern int audit_pid;
219 
220 #define AUDIT_INODE_BUCKETS     32
221 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
222 
223 static inline int audit_hash_ino(u32 ino)
224 {
225         return (ino & (AUDIT_INODE_BUCKETS-1));
226 }
227 
228 /* Indicates that audit should log the full pathname. */
229 #define AUDIT_NAME_FULL -1
230 
231 extern int audit_match_class(int class, unsigned syscall);
232 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
233 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
234 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
235 extern int parent_len(const char *path);
236 extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
237 extern struct sk_buff *audit_make_reply(__u32 portid, int seq, int type,
238                                         int done, int multi,
239                                         const void *payload, int size);
240 extern void                 audit_panic(const char *message);
241 
242 struct audit_netlink_list {
243         __u32 portid;
244         struct net *net;
245         struct sk_buff_head q;
246 };
247 
248 int audit_send_list(void *);
249 
250 struct audit_net {
251         struct sock *nlsk;
252 };
253 
254 extern int selinux_audit_rule_update(void);
255 
256 extern struct mutex audit_filter_mutex;
257 extern int audit_del_rule(struct audit_entry *);
258 extern void audit_free_rule_rcu(struct rcu_head *);
259 extern struct list_head audit_filter_list[];
260 
261 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
262 
263 extern void audit_log_d_path_exe(struct audit_buffer *ab,
264                                  struct mm_struct *mm);
265 
266 extern struct tty_struct *audit_get_tty(struct task_struct *tsk);
267 extern void audit_put_tty(struct tty_struct *tty);
268 
269 /* audit watch functions */
270 #ifdef CONFIG_AUDIT_WATCH
271 extern void audit_put_watch(struct audit_watch *watch);
272 extern void audit_get_watch(struct audit_watch *watch);
273 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
274 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
275 extern void audit_remove_watch_rule(struct audit_krule *krule);
276 extern char *audit_watch_path(struct audit_watch *watch);
277 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
278 
279 extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pathname, int len);
280 extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
281 extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
282 extern void audit_remove_mark_rule(struct audit_krule *krule);
283 extern int audit_mark_compare(struct audit_fsnotify_mark *mark, unsigned long ino, dev_t dev);
284 extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
285 extern int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark);
286 
287 #else
288 #define audit_put_watch(w) {}
289 #define audit_get_watch(w) {}
290 #define audit_to_watch(k, p, l, o) (-EINVAL)
291 #define audit_add_watch(k, l) (-EINVAL)
292 #define audit_remove_watch_rule(k) BUG()
293 #define audit_watch_path(w) ""
294 #define audit_watch_compare(w, i, d) 0
295 
296 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
297 #define audit_mark_path(m) ""
298 #define audit_remove_mark(m)
299 #define audit_remove_mark_rule(k)
300 #define audit_mark_compare(m, i, d) 0
301 #define audit_exe_compare(t, m) (-EINVAL)
302 #define audit_dupe_exe(n, o) (-EINVAL)
303 #endif /* CONFIG_AUDIT_WATCH */
304 
305 #ifdef CONFIG_AUDIT_TREE
306 extern struct audit_chunk *audit_tree_lookup(const struct inode *);
307 extern void audit_put_chunk(struct audit_chunk *);
308 extern bool audit_tree_match(struct audit_chunk *, struct audit_tree *);
309 extern int audit_make_tree(struct audit_krule *, char *, u32);
310 extern int audit_add_tree_rule(struct audit_krule *);
311 extern int audit_remove_tree_rule(struct audit_krule *);
312 extern void audit_trim_trees(void);
313 extern int audit_tag_tree(char *old, char *new);
314 extern const char *audit_tree_path(struct audit_tree *);
315 extern void audit_put_tree(struct audit_tree *);
316 extern void audit_kill_trees(struct list_head *);
317 #else
318 #define audit_remove_tree_rule(rule) BUG()
319 #define audit_add_tree_rule(rule) -EINVAL
320 #define audit_make_tree(rule, str, op) -EINVAL
321 #define audit_trim_trees() (void)0
322 #define audit_put_tree(tree) (void)0
323 #define audit_tag_tree(old, new) -EINVAL
324 #define audit_tree_path(rule) ""        /* never called */
325 #define audit_kill_trees(list) BUG()
326 #endif
327 
328 extern char *audit_unpack_string(void **, size_t *, size_t);
329 
330 extern pid_t audit_sig_pid;
331 extern kuid_t audit_sig_uid;
332 extern u32 audit_sig_sid;
333 
334 extern int audit_filter(int msgtype, unsigned int listtype);
335 
336 #ifdef CONFIG_AUDITSYSCALL
337 extern int __audit_signal_info(int sig, struct task_struct *t);
338 static inline int audit_signal_info(int sig, struct task_struct *t)
339 {
340         if (unlikely((audit_pid && t->tgid == audit_pid) ||
341                      (audit_signals && !audit_dummy_context())))
342                 return __audit_signal_info(sig, t);
343         return 0;
344 }
345 extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
346 extern struct list_head *audit_killed_trees(void);
347 #else
348 #define audit_signal_info(s,t) AUDIT_DISABLED
349 #define audit_filter_inodes(t,c) AUDIT_DISABLED
350 #endif
351 
352 extern struct mutex audit_cmd_mutex;
353 

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