2 * security/tomoyo/audit.c
4 * Pathname restriction functions.
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
10 #include <linux/slab.h>
13 * tomoyo_convert_time - Convert time_t to YYYY/MM/DD hh/mm/ss.
15 * @time: Seconds since 1970/01/01 00:00:00.
16 * @stamp: Pointer to "struct tomoyo_time".
20 * This function does not handle Y2038 problem.
22 static void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp)
24 static const u16 tomoyo_eom[2][12] = {
25 { 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
26 { 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
31 stamp->sec = time % 60;
33 stamp->min = time % 60;
35 stamp->hour = time % 24;
37 for (y = 1970; ; y++) {
38 const unsigned short days = (y & 3) ? 365 : 366;
44 for (m = 0; m < 11 && time >= tomoyo_eom[r][m]; m++)
47 time -= tomoyo_eom[r][m - 1];
54 * tomoyo_print_header - Get header line of audit log.
56 * @r: Pointer to "struct tomoyo_request_info".
58 * Returns string representation.
60 * This function uses kmalloc(), so caller must kfree() if this function
63 static char *tomoyo_print_header(struct tomoyo_request_info *r)
65 struct tomoyo_time stamp;
66 const pid_t gpid = task_pid_nr(current);
67 static const int tomoyo_buffer_len = 4096;
68 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
75 tomoyo_convert_time(tv.tv_sec, &stamp);
78 ppid = task_tgid_vnr(current->real_parent);
80 snprintf(buffer, tomoyo_buffer_len - 1,
81 "#%04u/%02u/%02u %02u:%02u:%02u# profile=%u mode=%s "
82 "granted=%s (global-pid=%u) task={ pid=%u ppid=%u "
83 "uid=%u gid=%u euid=%u egid=%u suid=%u sgid=%u "
84 "fsuid=%u fsgid=%u }",
85 stamp.year, stamp.month, stamp.day, stamp.hour,
86 stamp.min, stamp.sec, r->profile, tomoyo_mode[r->mode],
87 tomoyo_yesno(r->granted), gpid, task_tgid_vnr(current), ppid,
88 current_uid(), current_gid(), current_euid(), current_egid(),
89 current_suid(), current_sgid(), current_fsuid(),
95 * tomoyo_init_log - Allocate buffer for audit logs.
97 * @r: Pointer to "struct tomoyo_request_info".
98 * @len: Buffer size needed for @fmt and @args.
99 * @fmt: The printf()'s format string.
100 * @args: va_list structure for @fmt.
102 * Returns pointer to allocated memory.
104 * This function uses kzalloc(), so caller must kfree() if this function
105 * didn't return NULL.
107 char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
111 const char *header = NULL;
113 const char *domainname = tomoyo_domain()->domainname->name;
114 header = tomoyo_print_header(r);
117 /* +10 is for '\n' etc. and '\0'. */
118 len += strlen(domainname) + strlen(header) + 10;
119 len = tomoyo_round2(len);
120 buf = kzalloc(len, GFP_NOFS);
124 pos = snprintf(buf, len, "%s", header);
125 pos += snprintf(buf + pos, len - pos, "\n%s\n", domainname);
126 vsnprintf(buf + pos, len - pos, fmt, args);
132 /* Wait queue for /sys/kernel/security/tomoyo/audit. */
133 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_log_wait);
135 /* Structure for audit log. */
137 struct list_head list;
142 /* The list for "struct tomoyo_log". */
143 static LIST_HEAD(tomoyo_log);
145 /* Lock for "struct list_head tomoyo_log". */
146 static DEFINE_SPINLOCK(tomoyo_log_lock);
148 /* Length of "stuct list_head tomoyo_log". */
149 static unsigned int tomoyo_log_count;
152 * tomoyo_get_audit - Get audit mode.
154 * @profile: Profile number.
155 * @index: Index number of functionality.
156 * @is_granted: True if granted log, false otherwise.
158 * Returns true if this request should be audited, false otherwise.
160 static bool tomoyo_get_audit(const u8 profile, const u8 index,
161 const bool is_granted)
164 const u8 category = TOMOYO_MAC_CATEGORY_FILE + TOMOYO_MAX_MAC_INDEX;
165 struct tomoyo_profile *p;
166 if (!tomoyo_policy_loaded)
168 p = tomoyo_profile(profile);
169 if (tomoyo_log_count >= p->pref[TOMOYO_PREF_MAX_AUDIT_LOG])
171 mode = p->config[index];
172 if (mode == TOMOYO_CONFIG_USE_DEFAULT)
173 mode = p->config[category];
174 if (mode == TOMOYO_CONFIG_USE_DEFAULT)
175 mode = p->default_config;
177 return mode & TOMOYO_CONFIG_WANT_GRANT_LOG;
178 return mode & TOMOYO_CONFIG_WANT_REJECT_LOG;
182 * tomoyo_write_log2 - Write an audit log.
184 * @r: Pointer to "struct tomoyo_request_info".
185 * @len: Buffer size needed for @fmt and @args.
186 * @fmt: The printf()'s format string.
187 * @args: va_list structure for @fmt.
191 void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
195 struct tomoyo_log *entry;
196 bool quota_exceeded = false;
197 if (!tomoyo_get_audit(r->profile, r->type, r->granted))
199 buf = tomoyo_init_log(r, len, fmt, args);
202 entry = kzalloc(sizeof(*entry), GFP_NOFS);
208 len = tomoyo_round2(strlen(buf) + 1);
210 * The entry->size is used for memory quota checks.
211 * Don't go beyond strlen(entry->log).
213 entry->size = len + tomoyo_round2(sizeof(*entry));
214 spin_lock(&tomoyo_log_lock);
215 if (tomoyo_memory_quota[TOMOYO_MEMORY_AUDIT] &&
216 tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] + entry->size >=
217 tomoyo_memory_quota[TOMOYO_MEMORY_AUDIT]) {
218 quota_exceeded = true;
220 tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] += entry->size;
221 list_add_tail(&entry->list, &tomoyo_log);
224 spin_unlock(&tomoyo_log_lock);
225 if (quota_exceeded) {
230 wake_up(&tomoyo_log_wait);
236 * tomoyo_write_log - Write an audit log.
238 * @r: Pointer to "struct tomoyo_request_info".
239 * @fmt: The printf()'s format string, followed by parameters.
243 void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...)
248 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
251 tomoyo_write_log2(r, len, fmt, args);
256 * tomoyo_read_log - Read an audit log.
258 * @head: Pointer to "struct tomoyo_io_buffer".
262 void tomoyo_read_log(struct tomoyo_io_buffer *head)
264 struct tomoyo_log *ptr = NULL;
267 kfree(head->read_buf);
268 head->read_buf = NULL;
269 spin_lock(&tomoyo_log_lock);
270 if (!list_empty(&tomoyo_log)) {
271 ptr = list_entry(tomoyo_log.next, typeof(*ptr), list);
272 list_del(&ptr->list);
274 tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] -= ptr->size;
276 spin_unlock(&tomoyo_log_lock);
278 head->read_buf = ptr->log;
279 head->r.w[head->r.w_pos++] = head->read_buf;
285 * tomoyo_poll_log - Wait for an audit log.
287 * @file: Pointer to "struct file".
288 * @wait: Pointer to "poll_table".
290 * Returns POLLIN | POLLRDNORM when ready to read an audit log.
292 int tomoyo_poll_log(struct file *file, poll_table *wait)
294 if (tomoyo_log_count)
295 return POLLIN | POLLRDNORM;
296 poll_wait(file, &tomoyo_log_wait, wait);
297 if (tomoyo_log_count)
298 return POLLIN | POLLRDNORM;