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0153028a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <unistd.h> | |
4871690d | 23 | #include <stddef.h> |
0153028a LP |
24 | #include <sys/epoll.h> |
25 | ||
26 | #include "socket-util.h" | |
1dfa7e79 | 27 | #include "path-util.h" |
d025f1e4 | 28 | #include "journald-server.h" |
0153028a LP |
29 | #include "journald-native.h" |
30 | #include "journald-kmsg.h" | |
31 | #include "journald-console.h" | |
32 | #include "journald-syslog.h" | |
33 | ||
c4aa09b0 LP |
34 | /* Make sure not to make this smaller than the maximum coredump |
35 | * size. See COREDUMP_MAX in coredump.c */ | |
36 | #define ENTRY_SIZE_MAX (1024*1024*768) | |
37 | #define DATA_SIZE_MAX (1024*1024*768) | |
0153028a LP |
38 | |
39 | static bool valid_user_field(const char *p, size_t l) { | |
40 | const char *a; | |
41 | ||
42 | /* We kinda enforce POSIX syntax recommendations for | |
43 | environment variables here, but make a couple of additional | |
44 | requirements. | |
45 | ||
46 | http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */ | |
47 | ||
48 | /* No empty field names */ | |
49 | if (l <= 0) | |
50 | return false; | |
51 | ||
52 | /* Don't allow names longer than 64 chars */ | |
53 | if (l > 64) | |
54 | return false; | |
55 | ||
56 | /* Variables starting with an underscore are protected */ | |
57 | if (p[0] == '_') | |
58 | return false; | |
59 | ||
60 | /* Don't allow digits as first character */ | |
61 | if (p[0] >= '0' && p[0] <= '9') | |
62 | return false; | |
63 | ||
64 | /* Only allow A-Z0-9 and '_' */ | |
65 | for (a = p; a < p + l; a++) | |
66 | if (!((*a >= 'A' && *a <= 'Z') || | |
67 | (*a >= '0' && *a <= '9') || | |
68 | *a == '_')) | |
69 | return false; | |
70 | ||
71 | return true; | |
72 | } | |
73 | ||
968f3196 ZJS |
74 | static bool allow_object_pid(struct ucred *ucred) { |
75 | return ucred && ucred->uid == 0; | |
76 | } | |
77 | ||
0153028a LP |
78 | void server_process_native_message( |
79 | Server *s, | |
80 | const void *buffer, size_t buffer_size, | |
81 | struct ucred *ucred, | |
82 | struct timeval *tv, | |
83 | const char *label, size_t label_len) { | |
84 | ||
85 | struct iovec *iovec = NULL; | |
968f3196 | 86 | unsigned n = 0, j, tn = (unsigned) -1; |
0153028a | 87 | const char *p; |
968f3196 | 88 | size_t remaining, m = 0; |
0153028a LP |
89 | int priority = LOG_INFO; |
90 | char *identifier = NULL, *message = NULL; | |
968f3196 | 91 | pid_t object_pid = 0; |
0153028a LP |
92 | |
93 | assert(s); | |
94 | assert(buffer || buffer_size == 0); | |
95 | ||
96 | p = buffer; | |
97 | remaining = buffer_size; | |
98 | ||
99 | while (remaining > 0) { | |
100 | const char *e, *q; | |
101 | ||
102 | e = memchr(p, '\n', remaining); | |
103 | ||
104 | if (!e) { | |
105 | /* Trailing noise, let's ignore it, and flush what we collected */ | |
106 | log_debug("Received message with trailing noise, ignoring."); | |
107 | break; | |
108 | } | |
109 | ||
110 | if (e == p) { | |
111 | /* Entry separator */ | |
968f3196 | 112 | server_dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority, object_pid); |
0153028a LP |
113 | n = 0; |
114 | priority = LOG_INFO; | |
115 | ||
116 | p++; | |
117 | remaining--; | |
118 | continue; | |
119 | } | |
120 | ||
121 | if (*p == '.' || *p == '#') { | |
122 | /* Ignore control commands for now, and | |
123 | * comments too. */ | |
124 | remaining -= (e - p) + 1; | |
125 | p = e + 1; | |
126 | continue; | |
127 | } | |
128 | ||
129 | /* A property follows */ | |
130 | ||
f6422def | 131 | /* n received properties, +1 for _TRANSPORT */ |
968f3196 ZJS |
132 | if (!GREEDY_REALLOC(iovec, m, n + 1 + N_IOVEC_META_FIELDS + |
133 | !!object_pid * N_IOVEC_OBJECT_FIELDS)) { | |
134 | log_oom(); | |
135 | break; | |
0153028a LP |
136 | } |
137 | ||
138 | q = memchr(p, '=', e - p); | |
139 | if (q) { | |
140 | if (valid_user_field(p, q - p)) { | |
141 | size_t l; | |
142 | ||
143 | l = e - p; | |
144 | ||
145 | /* If the field name starts with an | |
146 | * underscore, skip the variable, | |
147 | * since that indidates a trusted | |
148 | * field */ | |
149 | iovec[n].iov_base = (char*) p; | |
150 | iovec[n].iov_len = l; | |
151 | n++; | |
152 | ||
153 | /* We need to determine the priority | |
154 | * of this entry for the rate limiting | |
155 | * logic */ | |
156 | if (l == 10 && | |
fd59d9f2 | 157 | hasprefix(p, "PRIORITY=") && |
0153028a LP |
158 | p[9] >= '0' && p[9] <= '9') |
159 | priority = (priority & LOG_FACMASK) | (p[9] - '0'); | |
160 | ||
161 | else if (l == 17 && | |
fd59d9f2 | 162 | hasprefix(p, "SYSLOG_FACILITY=") && |
0153028a LP |
163 | p[16] >= '0' && p[16] <= '9') |
164 | priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3); | |
165 | ||
166 | else if (l == 18 && | |
fd59d9f2 | 167 | hasprefix(p, "SYSLOG_FACILITY=") && |
0153028a LP |
168 | p[16] >= '0' && p[16] <= '9' && |
169 | p[17] >= '0' && p[17] <= '9') | |
170 | priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3); | |
171 | ||
172 | else if (l >= 19 && | |
fd59d9f2 | 173 | hasprefix(p, "SYSLOG_IDENTIFIER=")) { |
0153028a LP |
174 | char *t; |
175 | ||
176 | t = strndup(p + 18, l - 18); | |
177 | if (t) { | |
178 | free(identifier); | |
179 | identifier = t; | |
180 | } | |
181 | } else if (l >= 8 && | |
fd59d9f2 | 182 | hasprefix(p, "MESSAGE=")) { |
0153028a LP |
183 | char *t; |
184 | ||
185 | t = strndup(p + 8, l - 8); | |
186 | if (t) { | |
187 | free(message); | |
188 | message = t; | |
189 | } | |
968f3196 ZJS |
190 | } else if (l > strlen("OBJECT_PID=") && |
191 | l < strlen("OBJECT_PID=") + DECIMAL_STR_MAX(pid_t) && | |
192 | hasprefix(p, "OBJECT_PID=") && | |
193 | allow_object_pid(ucred)) { | |
194 | char buf[DECIMAL_STR_MAX(pid_t)]; | |
195 | memcpy(buf, p + strlen("OBJECT_PID="), l - strlen("OBJECT_PID=")); | |
196 | char_array_0(buf); | |
197 | ||
198 | /* ignore error */ | |
199 | parse_pid(buf, &object_pid); | |
0153028a LP |
200 | } |
201 | } | |
202 | ||
203 | remaining -= (e - p) + 1; | |
204 | p = e + 1; | |
205 | continue; | |
206 | } else { | |
207 | le64_t l_le; | |
208 | uint64_t l; | |
209 | char *k; | |
210 | ||
211 | if (remaining < e - p + 1 + sizeof(uint64_t) + 1) { | |
212 | log_debug("Failed to parse message, ignoring."); | |
213 | break; | |
214 | } | |
215 | ||
216 | memcpy(&l_le, e + 1, sizeof(uint64_t)); | |
217 | l = le64toh(l_le); | |
218 | ||
505b6a61 LP |
219 | if (l > DATA_SIZE_MAX) { |
220 | log_debug("Received binary data block too large, ignoring."); | |
221 | break; | |
222 | } | |
223 | ||
224 | if ((uint64_t) remaining < e - p + 1 + sizeof(uint64_t) + l + 1 || | |
0153028a LP |
225 | e[1+sizeof(uint64_t)+l] != '\n') { |
226 | log_debug("Failed to parse message, ignoring."); | |
227 | break; | |
228 | } | |
229 | ||
230 | k = malloc((e - p) + 1 + l); | |
231 | if (!k) { | |
232 | log_oom(); | |
233 | break; | |
234 | } | |
235 | ||
236 | memcpy(k, p, e - p); | |
237 | k[e - p] = '='; | |
238 | memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l); | |
239 | ||
240 | if (valid_user_field(p, e - p)) { | |
241 | iovec[n].iov_base = k; | |
242 | iovec[n].iov_len = (e - p) + 1 + l; | |
243 | n++; | |
244 | } else | |
245 | free(k); | |
246 | ||
247 | remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1; | |
248 | p = e + 1 + sizeof(uint64_t) + l + 1; | |
249 | } | |
250 | } | |
251 | ||
252 | if (n <= 0) | |
253 | goto finish; | |
254 | ||
255 | tn = n++; | |
256 | IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal"); | |
257 | ||
258 | if (message) { | |
259 | if (s->forward_to_syslog) | |
260 | server_forward_syslog(s, priority, identifier, message, ucred, tv); | |
261 | ||
262 | if (s->forward_to_kmsg) | |
263 | server_forward_kmsg(s, priority, identifier, message, ucred); | |
264 | ||
265 | if (s->forward_to_console) | |
266 | server_forward_console(s, priority, identifier, message, ucred); | |
267 | } | |
268 | ||
968f3196 | 269 | server_dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority, object_pid); |
0153028a LP |
270 | |
271 | finish: | |
272 | for (j = 0; j < n; j++) { | |
273 | if (j == tn) | |
274 | continue; | |
275 | ||
276 | if (iovec[j].iov_base < buffer || | |
277 | (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size) | |
278 | free(iovec[j].iov_base); | |
279 | } | |
280 | ||
281 | free(iovec); | |
282 | free(identifier); | |
283 | free(message); | |
284 | } | |
285 | ||
286 | void server_process_native_file( | |
287 | Server *s, | |
288 | int fd, | |
289 | struct ucred *ucred, | |
290 | struct timeval *tv, | |
291 | const char *label, size_t label_len) { | |
292 | ||
293 | struct stat st; | |
1dfa7e79 | 294 | _cleanup_free_ void *p = NULL; |
0153028a | 295 | ssize_t n; |
1dfa7e79 | 296 | int r; |
0153028a LP |
297 | |
298 | assert(s); | |
299 | assert(fd >= 0); | |
300 | ||
1dfa7e79 LP |
301 | if (!ucred || ucred->uid != 0) { |
302 | _cleanup_free_ char *sl = NULL, *k = NULL; | |
303 | const char *e; | |
304 | ||
305 | if (asprintf(&sl, "/proc/self/fd/%i", fd) < 0) { | |
306 | log_oom(); | |
307 | return; | |
308 | } | |
309 | ||
310 | r = readlink_malloc(sl, &k); | |
311 | if (r < 0) { | |
312 | log_error("readlink(%s) failed: %m", sl); | |
313 | return; | |
314 | } | |
315 | ||
316 | e = path_startswith(k, "/dev/shm/"); | |
317 | if (!e) | |
318 | e = path_startswith(k, "/tmp/"); | |
319 | if (!e) | |
320 | e = path_startswith(k, "/var/tmp/"); | |
321 | if (!e) { | |
322 | log_error("Received file outside of allowed directories. Refusing."); | |
323 | return; | |
324 | } | |
325 | ||
0b507b17 | 326 | if (!filename_is_safe(e)) { |
1dfa7e79 LP |
327 | log_error("Received file in subdirectory of allowed directories. Refusing."); |
328 | return; | |
329 | } | |
330 | } | |
331 | ||
0153028a LP |
332 | /* Data is in the passed file, since it didn't fit in a |
333 | * datagram. We can't map the file here, since clients might | |
334 | * then truncate it and trigger a SIGBUS for us. So let's | |
335 | * stupidly read it */ | |
336 | ||
337 | if (fstat(fd, &st) < 0) { | |
338 | log_error("Failed to stat passed file, ignoring: %m"); | |
339 | return; | |
340 | } | |
341 | ||
342 | if (!S_ISREG(st.st_mode)) { | |
343 | log_error("File passed is not regular. Ignoring."); | |
344 | return; | |
345 | } | |
346 | ||
347 | if (st.st_size <= 0) | |
348 | return; | |
349 | ||
350 | if (st.st_size > ENTRY_SIZE_MAX) { | |
351 | log_error("File passed too large. Ignoring."); | |
352 | return; | |
353 | } | |
354 | ||
355 | p = malloc(st.st_size); | |
356 | if (!p) { | |
357 | log_oom(); | |
358 | return; | |
359 | } | |
360 | ||
361 | n = pread(fd, p, st.st_size, 0); | |
362 | if (n < 0) | |
363 | log_error("Failed to read file, ignoring: %s", strerror(-n)); | |
364 | else if (n > 0) | |
365 | server_process_native_message(s, p, n, ucred, tv, label, label_len); | |
0153028a LP |
366 | } |
367 | ||
368 | int server_open_native_socket(Server*s) { | |
369 | union sockaddr_union sa; | |
370 | int one, r; | |
371 | struct epoll_event ev; | |
372 | ||
373 | assert(s); | |
374 | ||
375 | if (s->native_fd < 0) { | |
376 | ||
377 | s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
378 | if (s->native_fd < 0) { | |
379 | log_error("socket() failed: %m"); | |
380 | return -errno; | |
381 | } | |
382 | ||
383 | zero(sa); | |
384 | sa.un.sun_family = AF_UNIX; | |
385 | strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path)); | |
386 | ||
387 | unlink(sa.un.sun_path); | |
388 | ||
389 | r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)); | |
390 | if (r < 0) { | |
391 | log_error("bind() failed: %m"); | |
392 | return -errno; | |
393 | } | |
394 | ||
395 | chmod(sa.un.sun_path, 0666); | |
396 | } else | |
397 | fd_nonblock(s->native_fd, 1); | |
398 | ||
399 | one = 1; | |
400 | r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); | |
401 | if (r < 0) { | |
402 | log_error("SO_PASSCRED failed: %m"); | |
403 | return -errno; | |
404 | } | |
405 | ||
406 | #ifdef HAVE_SELINUX | |
407 | one = 1; | |
be2155ce | 408 | r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)); |
0153028a LP |
409 | if (r < 0) |
410 | log_warning("SO_PASSSEC failed: %m"); | |
411 | #endif | |
412 | ||
413 | one = 1; | |
414 | r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one)); | |
415 | if (r < 0) { | |
416 | log_error("SO_TIMESTAMP failed: %m"); | |
417 | return -errno; | |
418 | } | |
419 | ||
420 | zero(ev); | |
421 | ev.events = EPOLLIN; | |
422 | ev.data.fd = s->native_fd; | |
423 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) { | |
424 | log_error("Failed to add native server fd to epoll object: %m"); | |
425 | return -errno; | |
426 | } | |
427 | ||
428 | return 0; | |
429 | } |