2 * security/tomoyo/audit.c
4 * Copyright (C) 2005-2011 NTT DATA CORPORATION
8 #include <linux/slab.h>
11 * tomoyo_print_bprm - Print "struct linux_binprm" for auditing.
13 * @bprm: Pointer to "struct linux_binprm".
14 * @dump: Pointer to "struct tomoyo_page_dump".
16 * Returns the contents of @bprm on success, NULL otherwise.
18 * This function uses kzalloc(), so caller must kfree() if this function
21 static char *tomoyo_print_bprm(struct linux_binprm *bprm,
22 struct tomoyo_page_dump *dump)
24 static const int tomoyo_buffer_len = 4096 * 2;
25 char *buffer = kzalloc(tomoyo_buffer_len, GFP_NOFS);
29 unsigned long pos = bprm->p;
30 int offset = pos % PAGE_SIZE;
31 int argv_count = bprm->argc;
32 int envp_count = bprm->envc;
33 bool truncated = false;
36 len = snprintf(buffer, tomoyo_buffer_len - 1, "argv[]={ ");
39 memmove(cp, "} envp[]={ ", 11);
43 while (argv_count || envp_count) {
44 if (!tomoyo_dump_page(bprm, pos, dump))
46 pos += PAGE_SIZE - offset;
48 while (offset < PAGE_SIZE) {
49 const char *kaddr = dump->data;
50 const unsigned char c = kaddr[offset++];
53 if (cp >= buffer + tomoyo_buffer_len - 32) {
54 /* Reserve some room for "..." string. */
56 } else if (c == '\\') {
59 } else if (c > ' ' && c < 127) {
67 *cp++ = (c >> 6) + '0';
68 *cp++ = ((c >> 3) & 7) + '0';
69 *cp++ = (c & 7) + '0';
74 if (--argv_count == 0) {
77 memmove(cp, "... ", 4);
80 memmove(cp, "} envp[]={ ", 11);
85 } else if (envp_count) {
86 if (--envp_count == 0) {
89 memmove(cp, "... ", 4);
94 if (!argv_count && !envp_count)
103 snprintf(buffer, tomoyo_buffer_len - 1,
104 "argv[]={ ... } envp[]= { ... }");
109 * tomoyo_filetype - Get string representation of file type.
111 * @mode: Mode value for stat().
113 * Returns file type string.
115 static inline const char *tomoyo_filetype(const mode_t mode)
117 switch (mode & S_IFMT) {
120 return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FILE];
122 return tomoyo_condition_keyword[TOMOYO_TYPE_IS_DIRECTORY];
124 return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SYMLINK];
126 return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FIFO];
128 return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SOCKET];
130 return tomoyo_condition_keyword[TOMOYO_TYPE_IS_BLOCK_DEV];
132 return tomoyo_condition_keyword[TOMOYO_TYPE_IS_CHAR_DEV];
134 return "unknown"; /* This should not happen. */
138 * tomoyo_print_header - Get header line of audit log.
140 * @r: Pointer to "struct tomoyo_request_info".
142 * Returns string representation.
144 * This function uses kmalloc(), so caller must kfree() if this function
145 * didn't return NULL.
147 static char *tomoyo_print_header(struct tomoyo_request_info *r)
149 struct tomoyo_time stamp;
150 const pid_t gpid = task_pid_nr(current);
151 struct tomoyo_obj_info *obj = r->obj;
152 static const int tomoyo_buffer_len = 4096;
153 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
160 do_gettimeofday(&tv);
161 tomoyo_convert_time(tv.tv_sec, &stamp);
163 pos = snprintf(buffer, tomoyo_buffer_len - 1,
164 "#%04u/%02u/%02u %02u:%02u:%02u# profile=%u mode=%s "
165 "granted=%s (global-pid=%u) task={ pid=%u ppid=%u "
166 "uid=%u gid=%u euid=%u egid=%u suid=%u sgid=%u "
167 "fsuid=%u fsgid=%u }", stamp.year, stamp.month,
168 stamp.day, stamp.hour, stamp.min, stamp.sec, r->profile,
169 tomoyo_mode[r->mode], tomoyo_yesno(r->granted), gpid,
170 tomoyo_sys_getpid(), tomoyo_sys_getppid(),
171 current_uid(), current_gid(), current_euid(),
172 current_egid(), current_suid(), current_sgid(),
173 current_fsuid(), current_fsgid());
176 if (!obj->validate_done) {
177 tomoyo_get_attributes(obj);
178 obj->validate_done = true;
180 for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
181 struct tomoyo_mini_stat *stat;
184 if (!obj->stat_valid[i])
186 stat = &obj->stat[i];
190 pos += snprintf(buffer + pos,
191 tomoyo_buffer_len - 1 - pos,
192 " path%u.parent={ uid=%u gid=%u "
193 "ino=%lu perm=0%o }", (i >> 1) + 1,
194 stat->uid, stat->gid, (unsigned long)
195 stat->ino, stat->mode & S_IALLUGO);
198 pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
199 " path%u={ uid=%u gid=%u ino=%lu major=%u"
200 " minor=%u perm=0%o type=%s", (i >> 1) + 1,
201 stat->uid, stat->gid, (unsigned long)
202 stat->ino, MAJOR(dev), MINOR(dev),
203 mode & S_IALLUGO, tomoyo_filetype(mode));
204 if (S_ISCHR(mode) || S_ISBLK(mode)) {
206 pos += snprintf(buffer + pos,
207 tomoyo_buffer_len - 1 - pos,
208 " dev_major=%u dev_minor=%u",
209 MAJOR(dev), MINOR(dev));
211 pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
215 if (pos < tomoyo_buffer_len - 1)
222 * tomoyo_init_log - Allocate buffer for audit logs.
224 * @r: Pointer to "struct tomoyo_request_info".
225 * @len: Buffer size needed for @fmt and @args.
226 * @fmt: The printf()'s format string.
227 * @args: va_list structure for @fmt.
229 * Returns pointer to allocated memory.
231 * This function uses kzalloc(), so caller must kfree() if this function
232 * didn't return NULL.
234 char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
238 char *bprm_info = NULL;
239 const char *header = NULL;
240 char *realpath = NULL;
241 const char *symlink = NULL;
243 const char *domainname = r->domain->domainname->name;
244 header = tomoyo_print_header(r);
247 /* +10 is for '\n' etc. and '\0'. */
248 len += strlen(domainname) + strlen(header) + 10;
250 struct file *file = r->ee->bprm->file;
251 realpath = tomoyo_realpath_from_path(&file->f_path);
252 bprm_info = tomoyo_print_bprm(r->ee->bprm, &r->ee->dump);
253 if (!realpath || !bprm_info)
255 /* +80 is for " exec={ realpath=\"%s\" argc=%d envc=%d %s }" */
256 len += strlen(realpath) + 80 + strlen(bprm_info);
257 } else if (r->obj && r->obj->symlink_target) {
258 symlink = r->obj->symlink_target->name;
259 /* +18 is for " symlink.target=\"%s\"" */
260 len += 18 + strlen(symlink);
262 len = tomoyo_round2(len);
263 buf = kzalloc(len, GFP_NOFS);
267 pos = snprintf(buf, len, "%s", header);
269 struct linux_binprm *bprm = r->ee->bprm;
270 pos += snprintf(buf + pos, len - pos,
271 " exec={ realpath=\"%s\" argc=%d envc=%d %s }",
272 realpath, bprm->argc, bprm->envc, bprm_info);
274 pos += snprintf(buf + pos, len - pos, " symlink.target=\"%s\"",
276 pos += snprintf(buf + pos, len - pos, "\n%s\n", domainname);
277 vsnprintf(buf + pos, len - pos, fmt, args);
285 /* Wait queue for /sys/kernel/security/tomoyo/audit. */
286 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_log_wait);
288 /* Structure for audit log. */
290 struct list_head list;
295 /* The list for "struct tomoyo_log". */
296 static LIST_HEAD(tomoyo_log);
298 /* Lock for "struct list_head tomoyo_log". */
299 static DEFINE_SPINLOCK(tomoyo_log_lock);
301 /* Length of "stuct list_head tomoyo_log". */
302 static unsigned int tomoyo_log_count;
305 * tomoyo_get_audit - Get audit mode.
307 * @ns: Pointer to "struct tomoyo_policy_namespace".
308 * @profile: Profile number.
309 * @index: Index number of functionality.
310 * @is_granted: True if granted log, false otherwise.
312 * Returns true if this request should be audited, false otherwise.
314 static bool tomoyo_get_audit(const struct tomoyo_policy_namespace *ns,
315 const u8 profile, const u8 index,
316 const struct tomoyo_acl_info *matched_acl,
317 const bool is_granted)
320 const u8 category = tomoyo_index2category[index] +
321 TOMOYO_MAX_MAC_INDEX;
322 struct tomoyo_profile *p;
323 if (!tomoyo_policy_loaded)
325 p = tomoyo_profile(ns, profile);
326 if (tomoyo_log_count >= p->pref[TOMOYO_PREF_MAX_AUDIT_LOG])
328 if (is_granted && matched_acl && matched_acl->cond &&
329 matched_acl->cond->grant_log != TOMOYO_GRANTLOG_AUTO)
330 return matched_acl->cond->grant_log == TOMOYO_GRANTLOG_YES;
331 mode = p->config[index];
332 if (mode == TOMOYO_CONFIG_USE_DEFAULT)
333 mode = p->config[category];
334 if (mode == TOMOYO_CONFIG_USE_DEFAULT)
335 mode = p->default_config;
337 return mode & TOMOYO_CONFIG_WANT_GRANT_LOG;
338 return mode & TOMOYO_CONFIG_WANT_REJECT_LOG;
342 * tomoyo_write_log2 - Write an audit log.
344 * @r: Pointer to "struct tomoyo_request_info".
345 * @len: Buffer size needed for @fmt and @args.
346 * @fmt: The printf()'s format string.
347 * @args: va_list structure for @fmt.
351 void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
355 struct tomoyo_log *entry;
356 bool quota_exceeded = false;
357 if (!tomoyo_get_audit(r->domain->ns, r->profile, r->type,
358 r->matched_acl, r->granted))
360 buf = tomoyo_init_log(r, len, fmt, args);
363 entry = kzalloc(sizeof(*entry), GFP_NOFS);
369 len = tomoyo_round2(strlen(buf) + 1);
371 * The entry->size is used for memory quota checks.
372 * Don't go beyond strlen(entry->log).
374 entry->size = len + tomoyo_round2(sizeof(*entry));
375 spin_lock(&tomoyo_log_lock);
376 if (tomoyo_memory_quota[TOMOYO_MEMORY_AUDIT] &&
377 tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] + entry->size >=
378 tomoyo_memory_quota[TOMOYO_MEMORY_AUDIT]) {
379 quota_exceeded = true;
381 tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] += entry->size;
382 list_add_tail(&entry->list, &tomoyo_log);
385 spin_unlock(&tomoyo_log_lock);
386 if (quota_exceeded) {
391 wake_up(&tomoyo_log_wait);
397 * tomoyo_write_log - Write an audit log.
399 * @r: Pointer to "struct tomoyo_request_info".
400 * @fmt: The printf()'s format string, followed by parameters.
404 void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...)
409 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
412 tomoyo_write_log2(r, len, fmt, args);
417 * tomoyo_read_log - Read an audit log.
419 * @head: Pointer to "struct tomoyo_io_buffer".
423 void tomoyo_read_log(struct tomoyo_io_buffer *head)
425 struct tomoyo_log *ptr = NULL;
428 kfree(head->read_buf);
429 head->read_buf = NULL;
430 spin_lock(&tomoyo_log_lock);
431 if (!list_empty(&tomoyo_log)) {
432 ptr = list_entry(tomoyo_log.next, typeof(*ptr), list);
433 list_del(&ptr->list);
435 tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] -= ptr->size;
437 spin_unlock(&tomoyo_log_lock);
439 head->read_buf = ptr->log;
440 head->r.w[head->r.w_pos++] = head->read_buf;
446 * tomoyo_poll_log - Wait for an audit log.
448 * @file: Pointer to "struct file".
449 * @wait: Pointer to "poll_table".
451 * Returns POLLIN | POLLRDNORM when ready to read an audit log.
453 int tomoyo_poll_log(struct file *file, poll_table *wait)
455 if (tomoyo_log_count)
456 return POLLIN | POLLRDNORM;
457 poll_wait(file, &tomoyo_log_wait, wait);
458 if (tomoyo_log_count)
459 return POLLIN | POLLRDNORM;