LXR 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. */
  36enum 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 */
  53struct audit_watch;
  54struct audit_fsnotify_mark;
  55struct audit_tree;
  56struct audit_chunk;
  57
  58struct audit_entry {
  59        struct list_head        list;
  60        struct rcu_head         rcu;
  61        struct audit_krule      rule;
  62};
  63
  64struct 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        kernel_cap_t            ambient;
  72        kuid_t                  rootid;
  73};
  74
  75/* When fs/namei.c:getname() is called, we store the pointer in name and bump
  76 * the refcnt in the associated filename struct.
  77 *
  78 * Further, in fs/namei.c:path_lookup() we store the inode and device.
  79 */
  80struct audit_names {
  81        struct list_head        list;           /* audit_context->names_list */
  82
  83        struct filename         *name;
  84        int                     name_len;       /* number of chars to log */
  85        bool                    hidden;         /* don't log this record */
  86
  87        unsigned long           ino;
  88        dev_t                   dev;
  89        umode_t                 mode;
  90        kuid_t                  uid;
  91        kgid_t                  gid;
  92        dev_t                   rdev;
  93        u32                     osid;
  94        struct audit_cap_data   fcap;
  95        unsigned int            fcap_ver;
  96        unsigned char           type;           /* record type */
  97        /*
  98         * This was an allocated audit_names and not from the array of
  99         * names allocated in the task audit context.  Thus this name
 100         * should be freed on syscall exit.
 101         */
 102        bool                    should_free;
 103};
 104
 105struct audit_proctitle {
 106        int     len;    /* length of the cmdline field. */
 107        char    *value; /* the cmdline field */
 108};
 109
 110/* The per-task audit context. */
 111struct audit_context {
 112        int                 dummy;      /* must be the first element */
 113        int                 in_syscall; /* 1 if task is in a syscall */
 114        enum audit_state    state, current_state;
 115        unsigned int        serial;     /* serial number for record */
 116        int                 major;      /* syscall number */
 117        struct timespec64   ctime;      /* time of syscall entry */
 118        unsigned long       argv[4];    /* syscall arguments */
 119        long                return_code;/* syscall return code */
 120        u64                 prio;
 121        int                 return_valid; /* return code is valid */
 122        /*
 123         * The names_list is the list of all audit_names collected during this
 124         * syscall.  The first AUDIT_NAMES entries in the names_list will
 125         * actually be from the preallocated_names array for performance
 126         * reasons.  Except during allocation they should never be referenced
 127         * through the preallocated_names array and should only be found/used
 128         * by running the names_list.
 129         */
 130        struct audit_names  preallocated_names[AUDIT_NAMES];
 131        int                 name_count; /* total records in names_list */
 132        struct list_head    names_list; /* struct audit_names->list anchor */
 133        char                *filterkey; /* key for rule that triggered record */
 134        struct path         pwd;
 135        struct audit_aux_data *aux;
 136        struct audit_aux_data *aux_pids;
 137        struct sockaddr_storage *sockaddr;
 138        size_t sockaddr_len;
 139                                /* Save things to print about task_struct */
 140        pid_t               pid, ppid;
 141        kuid_t              uid, euid, suid, fsuid;
 142        kgid_t              gid, egid, sgid, fsgid;
 143        unsigned long       personality;
 144        int                 arch;
 145
 146        pid_t               target_pid;
 147        kuid_t              target_auid;
 148        kuid_t              target_uid;
 149        unsigned int        target_sessionid;
 150        u32                 target_sid;
 151        char                target_comm[TASK_COMM_LEN];
 152
 153        struct audit_tree_refs *trees, *first_trees;
 154        struct list_head killed_trees;
 155        int tree_count;
 156
 157        int type;
 158        union {
 159                struct {
 160                        int nargs;
 161                        long args[6];
 162                } socketcall;
 163                struct {
 164                        kuid_t                  uid;
 165                        kgid_t                  gid;
 166                        umode_t                 mode;
 167                        u32                     osid;
 168                        int                     has_perm;
 169                        uid_t                   perm_uid;
 170                        gid_t                   perm_gid;
 171                        umode_t                 perm_mode;
 172                        unsigned long           qbytes;
 173                } ipc;
 174                struct {
 175                        mqd_t                   mqdes;
 176                        struct mq_attr          mqstat;
 177                } mq_getsetattr;
 178                struct {
 179                        mqd_t                   mqdes;
 180                        int                     sigev_signo;
 181                } mq_notify;
 182                struct {
 183                        mqd_t                   mqdes;
 184                        size_t                  msg_len;
 185                        unsigned int            msg_prio;
 186                        struct timespec64       abs_timeout;
 187                } mq_sendrecv;
 188                struct {
 189                        int                     oflag;
 190                        umode_t                 mode;
 191                        struct mq_attr          attr;
 192                } mq_open;
 193                struct {
 194                        pid_t                   pid;
 195                        struct audit_cap_data   cap;
 196                } capset;
 197                struct {
 198                        int                     fd;
 199                        int                     flags;
 200                } mmap;
 201                struct {
 202                        int                     argc;
 203                } execve;
 204                struct {
 205                        char                    *name;
 206                } module;
 207        };
 208        int fds[2];
 209        struct audit_proctitle proctitle;
 210};
 211
 212extern bool audit_ever_enabled;
 213
 214extern void audit_log_session_info(struct audit_buffer *ab);
 215
 216extern int auditd_test_task(struct task_struct *task);
 217
 218#define AUDIT_INODE_BUCKETS     32
 219extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
 220
 221static inline int audit_hash_ino(u32 ino)
 222{
 223        return (ino & (AUDIT_INODE_BUCKETS-1));
 224}
 225
 226/* Indicates that audit should log the full pathname. */
 227#define AUDIT_NAME_FULL -1
 228
 229extern int audit_match_class(int class, unsigned syscall);
 230extern int audit_comparator(const u32 left, const u32 op, const u32 right);
 231extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
 232extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
 233extern int parent_len(const char *path);
 234extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
 235extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
 236                                        const void *payload, int size);
 237extern void                 audit_panic(const char *message);
 238
 239struct audit_netlink_list {
 240        __u32 portid;
 241        struct net *net;
 242        struct sk_buff_head q;
 243};
 244
 245int audit_send_list(void *_dest);
 246
 247extern int selinux_audit_rule_update(void);
 248
 249extern struct mutex audit_filter_mutex;
 250extern int audit_del_rule(struct audit_entry *entry);
 251extern void audit_free_rule_rcu(struct rcu_head *head);
 252extern struct list_head audit_filter_list[];
 253
 254extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
 255
 256extern void audit_log_d_path_exe(struct audit_buffer *ab,
 257                                 struct mm_struct *mm);
 258
 259extern struct tty_struct *audit_get_tty(void);
 260extern void audit_put_tty(struct tty_struct *tty);
 261
 262/* audit watch/mark/tree functions */
 263#ifdef CONFIG_AUDITSYSCALL
 264extern unsigned int audit_serial(void);
 265extern int auditsc_get_stamp(struct audit_context *ctx,
 266                              struct timespec64 *t, unsigned int *serial);
 267
 268extern void audit_put_watch(struct audit_watch *watch);
 269extern void audit_get_watch(struct audit_watch *watch);
 270extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
 271                          u32 op);
 272extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
 273extern void audit_remove_watch_rule(struct audit_krule *krule);
 274extern char *audit_watch_path(struct audit_watch *watch);
 275extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino,
 276                               dev_t dev);
 277
 278extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
 279                                                    char *pathname, int len);
 280extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
 281extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
 282extern void audit_remove_mark_rule(struct audit_krule *krule);
 283extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
 284                              unsigned long ino, dev_t dev);
 285extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
 286extern int audit_exe_compare(struct task_struct *tsk,
 287                             struct audit_fsnotify_mark *mark);
 288
 289extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
 290extern void audit_put_chunk(struct audit_chunk *chunk);
 291extern bool audit_tree_match(struct audit_chunk *chunk,
 292                             struct audit_tree *tree);
 293extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
 294extern int audit_add_tree_rule(struct audit_krule *rule);
 295extern int audit_remove_tree_rule(struct audit_krule *rule);
 296extern void audit_trim_trees(void);
 297extern int audit_tag_tree(char *old, char *new);
 298extern const char *audit_tree_path(struct audit_tree *tree);
 299extern void audit_put_tree(struct audit_tree *tree);
 300extern void audit_kill_trees(struct audit_context *context);
 301
 302extern int audit_signal_info(int sig, struct task_struct *t);
 303extern void audit_filter_inodes(struct task_struct *tsk,
 304                                struct audit_context *ctx);
 305extern struct list_head *audit_killed_trees(void);
 306#else /* CONFIG_AUDITSYSCALL */
 307#define auditsc_get_stamp(c, t, s) 0
 308#define audit_put_watch(w) {}
 309#define audit_get_watch(w) {}
 310#define audit_to_watch(k, p, l, o) (-EINVAL)
 311#define audit_add_watch(k, l) (-EINVAL)
 312#define audit_remove_watch_rule(k) BUG()
 313#define audit_watch_path(w) ""
 314#define audit_watch_compare(w, i, d) 0
 315
 316#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
 317#define audit_mark_path(m) ""
 318#define audit_remove_mark(m)
 319#define audit_remove_mark_rule(k)
 320#define audit_mark_compare(m, i, d) 0
 321#define audit_exe_compare(t, m) (-EINVAL)
 322#define audit_dupe_exe(n, o) (-EINVAL)
 323
 324#define audit_remove_tree_rule(rule) BUG()
 325#define audit_add_tree_rule(rule) -EINVAL
 326#define audit_make_tree(rule, str, op) -EINVAL
 327#define audit_trim_trees() (void)0
 328#define audit_put_tree(tree) (void)0
 329#define audit_tag_tree(old, new) -EINVAL
 330#define audit_tree_path(rule) ""        /* never called */
 331#define audit_kill_trees(context) BUG()
 332
 333#define audit_signal_info(s, t) AUDIT_DISABLED
 334#define audit_filter_inodes(t, c) AUDIT_DISABLED
 335#endif /* CONFIG_AUDITSYSCALL */
 336
 337extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
 338
 339extern pid_t audit_sig_pid;
 340extern kuid_t audit_sig_uid;
 341extern u32 audit_sig_sid;
 342
 343extern int audit_filter(int msgtype, unsigned int listtype);
 344
 345extern void audit_ctl_lock(void);
 346extern void audit_ctl_unlock(void);
 347