Line | Count | Source (jump to first uncovered line) |
1 | | /* $OpenBSD: misc.c,v 1.189 2023/10/12 03:36:32 djm Exp $ */ |
2 | | /* |
3 | | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
4 | | * Copyright (c) 2005-2020 Damien Miller. All rights reserved. |
5 | | * Copyright (c) 2004 Henning Brauer <henning@openbsd.org> |
6 | | * |
7 | | * Permission to use, copy, modify, and distribute this software for any |
8 | | * purpose with or without fee is hereby granted, provided that the above |
9 | | * copyright notice and this permission notice appear in all copies. |
10 | | * |
11 | | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
12 | | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
13 | | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
14 | | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
15 | | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
16 | | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
17 | | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
18 | | */ |
19 | | |
20 | | |
21 | | #include "includes.h" |
22 | | |
23 | | #include <sys/types.h> |
24 | | #include <sys/ioctl.h> |
25 | | #include <sys/mman.h> |
26 | | #include <sys/socket.h> |
27 | | #include <sys/stat.h> |
28 | | #include <sys/time.h> |
29 | | #include <sys/wait.h> |
30 | | #include <sys/un.h> |
31 | | |
32 | | #include <limits.h> |
33 | | #ifdef HAVE_LIBGEN_H |
34 | | # include <libgen.h> |
35 | | #endif |
36 | | #ifdef HAVE_POLL_H |
37 | | #include <poll.h> |
38 | | #endif |
39 | | #ifdef HAVE_NLIST_H |
40 | | #include <nlist.h> |
41 | | #endif |
42 | | #include <signal.h> |
43 | | #include <stdarg.h> |
44 | | #include <stdio.h> |
45 | | #ifdef HAVE_STDINT_H |
46 | | # include <stdint.h> |
47 | | #endif |
48 | | #include <stdlib.h> |
49 | | #include <string.h> |
50 | | #include <time.h> |
51 | | #include <unistd.h> |
52 | | |
53 | | #include <netinet/in.h> |
54 | | #include <netinet/in_systm.h> |
55 | | #include <netinet/ip.h> |
56 | | #include <netinet/tcp.h> |
57 | | #include <arpa/inet.h> |
58 | | |
59 | | #include <ctype.h> |
60 | | #include <errno.h> |
61 | | #include <fcntl.h> |
62 | | #include <netdb.h> |
63 | | #ifdef HAVE_PATHS_H |
64 | | # include <paths.h> |
65 | | #include <pwd.h> |
66 | | #include <grp.h> |
67 | | #endif |
68 | | #ifdef SSH_TUN_OPENBSD |
69 | | #include <net/if.h> |
70 | | #endif |
71 | | |
72 | | #include "xmalloc.h" |
73 | | #include "misc.h" |
74 | | #include "log.h" |
75 | | #include "ssh.h" |
76 | | #include "sshbuf.h" |
77 | | #include "ssherr.h" |
78 | | #include "platform.h" |
79 | | |
80 | | /* remove newline at end of string */ |
81 | | char * |
82 | | chop(char *s) |
83 | 0 | { |
84 | 0 | char *t = s; |
85 | 0 | while (*t) { |
86 | 0 | if (*t == '\n' || *t == '\r') { |
87 | 0 | *t = '\0'; |
88 | 0 | return s; |
89 | 0 | } |
90 | 0 | t++; |
91 | 0 | } |
92 | 0 | return s; |
93 | |
|
94 | 0 | } |
95 | | |
96 | | /* remove whitespace from end of string */ |
97 | | void |
98 | | rtrim(char *s) |
99 | 0 | { |
100 | 0 | size_t i; |
101 | |
|
102 | 0 | if ((i = strlen(s)) == 0) |
103 | 0 | return; |
104 | 0 | for (i--; i > 0; i--) { |
105 | 0 | if (isspace((unsigned char)s[i])) |
106 | 0 | s[i] = '\0'; |
107 | 0 | } |
108 | 0 | } |
109 | | |
110 | | /* set/unset filedescriptor to non-blocking */ |
111 | | int |
112 | | set_nonblock(int fd) |
113 | 849 | { |
114 | 849 | int val; |
115 | | |
116 | 849 | val = fcntl(fd, F_GETFL); |
117 | 849 | if (val == -1) { |
118 | 0 | error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); |
119 | 0 | return (-1); |
120 | 0 | } |
121 | 849 | if (val & O_NONBLOCK) { |
122 | 848 | debug3("fd %d is O_NONBLOCK", fd); |
123 | 848 | return (0); |
124 | 848 | } |
125 | 1 | debug2("fd %d setting O_NONBLOCK", fd); |
126 | 1 | val |= O_NONBLOCK; |
127 | 1 | if (fcntl(fd, F_SETFL, val) == -1) { |
128 | 0 | debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, |
129 | 0 | strerror(errno)); |
130 | 0 | return (-1); |
131 | 0 | } |
132 | 1 | return (0); |
133 | 1 | } |
134 | | |
135 | | int |
136 | | unset_nonblock(int fd) |
137 | 0 | { |
138 | 0 | int val; |
139 | |
|
140 | 0 | val = fcntl(fd, F_GETFL); |
141 | 0 | if (val == -1) { |
142 | 0 | error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); |
143 | 0 | return (-1); |
144 | 0 | } |
145 | 0 | if (!(val & O_NONBLOCK)) { |
146 | 0 | debug3("fd %d is not O_NONBLOCK", fd); |
147 | 0 | return (0); |
148 | 0 | } |
149 | 0 | debug("fd %d clearing O_NONBLOCK", fd); |
150 | 0 | val &= ~O_NONBLOCK; |
151 | 0 | if (fcntl(fd, F_SETFL, val) == -1) { |
152 | 0 | debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", |
153 | 0 | fd, strerror(errno)); |
154 | 0 | return (-1); |
155 | 0 | } |
156 | 0 | return (0); |
157 | 0 | } |
158 | | |
159 | | const char * |
160 | | ssh_gai_strerror(int gaierr) |
161 | 0 | { |
162 | 0 | if (gaierr == EAI_SYSTEM && errno != 0) |
163 | 0 | return strerror(errno); |
164 | 0 | return gai_strerror(gaierr); |
165 | 0 | } |
166 | | |
167 | | /* disable nagle on socket */ |
168 | | void |
169 | | set_nodelay(int fd) |
170 | 0 | { |
171 | 0 | int opt; |
172 | 0 | socklen_t optlen; |
173 | |
|
174 | 0 | optlen = sizeof opt; |
175 | 0 | if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { |
176 | 0 | debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); |
177 | 0 | return; |
178 | 0 | } |
179 | 0 | if (opt == 1) { |
180 | 0 | debug2("fd %d is TCP_NODELAY", fd); |
181 | 0 | return; |
182 | 0 | } |
183 | 0 | opt = 1; |
184 | 0 | debug2("fd %d setting TCP_NODELAY", fd); |
185 | 0 | if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) |
186 | 0 | error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); |
187 | 0 | } |
188 | | |
189 | | /* Allow local port reuse in TIME_WAIT */ |
190 | | int |
191 | | set_reuseaddr(int fd) |
192 | 0 | { |
193 | 0 | int on = 1; |
194 | |
|
195 | 0 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) { |
196 | 0 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); |
197 | 0 | return -1; |
198 | 0 | } |
199 | 0 | return 0; |
200 | 0 | } |
201 | | |
202 | | /* Get/set routing domain */ |
203 | | char * |
204 | | get_rdomain(int fd) |
205 | 0 | { |
206 | 0 | #if defined(HAVE_SYS_GET_RDOMAIN) |
207 | 0 | return sys_get_rdomain(fd); |
208 | | #elif defined(__OpenBSD__) |
209 | | int rtable; |
210 | | char *ret; |
211 | | socklen_t len = sizeof(rtable); |
212 | | |
213 | | if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) { |
214 | | error("Failed to get routing domain for fd %d: %s", |
215 | | fd, strerror(errno)); |
216 | | return NULL; |
217 | | } |
218 | | xasprintf(&ret, "%d", rtable); |
219 | | return ret; |
220 | | #else /* defined(__OpenBSD__) */ |
221 | | return NULL; |
222 | | #endif |
223 | 0 | } |
224 | | |
225 | | int |
226 | | set_rdomain(int fd, const char *name) |
227 | 0 | { |
228 | 0 | #if defined(HAVE_SYS_SET_RDOMAIN) |
229 | 0 | return sys_set_rdomain(fd, name); |
230 | | #elif defined(__OpenBSD__) |
231 | | int rtable; |
232 | | const char *errstr; |
233 | | |
234 | | if (name == NULL) |
235 | | return 0; /* default table */ |
236 | | |
237 | | rtable = (int)strtonum(name, 0, 255, &errstr); |
238 | | if (errstr != NULL) { |
239 | | /* Shouldn't happen */ |
240 | | error("Invalid routing domain \"%s\": %s", name, errstr); |
241 | | return -1; |
242 | | } |
243 | | if (setsockopt(fd, SOL_SOCKET, SO_RTABLE, |
244 | | &rtable, sizeof(rtable)) == -1) { |
245 | | error("Failed to set routing domain %d on fd %d: %s", |
246 | | rtable, fd, strerror(errno)); |
247 | | return -1; |
248 | | } |
249 | | return 0; |
250 | | #else /* defined(__OpenBSD__) */ |
251 | | error("Setting routing domain is not supported on this platform"); |
252 | | return -1; |
253 | | #endif |
254 | 0 | } |
255 | | |
256 | | int |
257 | | get_sock_af(int fd) |
258 | 0 | { |
259 | 0 | struct sockaddr_storage to; |
260 | 0 | socklen_t tolen = sizeof(to); |
261 | |
|
262 | 0 | memset(&to, 0, sizeof(to)); |
263 | 0 | if (getsockname(fd, (struct sockaddr *)&to, &tolen) == -1) |
264 | 0 | return -1; |
265 | 0 | #ifdef IPV4_IN_IPV6 |
266 | 0 | if (to.ss_family == AF_INET6 && |
267 | 0 | IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&to)->sin6_addr)) |
268 | 0 | return AF_INET; |
269 | 0 | #endif |
270 | 0 | return to.ss_family; |
271 | 0 | } |
272 | | |
273 | | void |
274 | | set_sock_tos(int fd, int tos) |
275 | 0 | { |
276 | 0 | #ifndef IP_TOS_IS_BROKEN |
277 | 0 | int af; |
278 | |
|
279 | 0 | switch ((af = get_sock_af(fd))) { |
280 | 0 | case -1: |
281 | | /* assume not a socket */ |
282 | 0 | break; |
283 | 0 | case AF_INET: |
284 | 0 | # ifdef IP_TOS |
285 | 0 | debug3_f("set socket %d IP_TOS 0x%02x", fd, tos); |
286 | 0 | if (setsockopt(fd, IPPROTO_IP, IP_TOS, |
287 | 0 | &tos, sizeof(tos)) == -1) { |
288 | 0 | error("setsockopt socket %d IP_TOS %d: %s", |
289 | 0 | fd, tos, strerror(errno)); |
290 | 0 | } |
291 | 0 | # endif /* IP_TOS */ |
292 | 0 | break; |
293 | 0 | case AF_INET6: |
294 | 0 | # ifdef IPV6_TCLASS |
295 | 0 | debug3_f("set socket %d IPV6_TCLASS 0x%02x", fd, tos); |
296 | 0 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, |
297 | 0 | &tos, sizeof(tos)) == -1) { |
298 | 0 | error("setsockopt socket %d IPV6_TCLASS %d: %s", |
299 | 0 | fd, tos, strerror(errno)); |
300 | 0 | } |
301 | 0 | # endif /* IPV6_TCLASS */ |
302 | 0 | break; |
303 | 0 | default: |
304 | 0 | debug2_f("unsupported socket family %d", af); |
305 | 0 | break; |
306 | 0 | } |
307 | 0 | #endif /* IP_TOS_IS_BROKEN */ |
308 | 0 | } |
309 | | |
310 | | /* |
311 | | * Wait up to *timeoutp milliseconds for events on fd. Updates |
312 | | * *timeoutp with time remaining. |
313 | | * Returns 0 if fd ready or -1 on timeout or error (see errno). |
314 | | */ |
315 | | static int |
316 | | waitfd(int fd, int *timeoutp, short events, volatile sig_atomic_t *stop) |
317 | 0 | { |
318 | 0 | struct pollfd pfd; |
319 | 0 | struct timespec timeout; |
320 | 0 | int oerrno, r; |
321 | 0 | sigset_t nsigset, osigset; |
322 | |
|
323 | 0 | if (timeoutp && *timeoutp == -1) |
324 | 0 | timeoutp = NULL; |
325 | 0 | pfd.fd = fd; |
326 | 0 | pfd.events = events; |
327 | 0 | ptimeout_init(&timeout); |
328 | 0 | if (timeoutp != NULL) |
329 | 0 | ptimeout_deadline_ms(&timeout, *timeoutp); |
330 | 0 | if (stop != NULL) |
331 | 0 | sigfillset(&nsigset); |
332 | 0 | for (; timeoutp == NULL || *timeoutp >= 0;) { |
333 | 0 | if (stop != NULL) { |
334 | 0 | sigprocmask(SIG_BLOCK, &nsigset, &osigset); |
335 | 0 | if (*stop) { |
336 | 0 | sigprocmask(SIG_SETMASK, &osigset, NULL); |
337 | 0 | errno = EINTR; |
338 | 0 | return -1; |
339 | 0 | } |
340 | 0 | } |
341 | 0 | r = ppoll(&pfd, 1, ptimeout_get_tsp(&timeout), |
342 | 0 | stop != NULL ? &osigset : NULL); |
343 | 0 | oerrno = errno; |
344 | 0 | if (stop != NULL) |
345 | 0 | sigprocmask(SIG_SETMASK, &osigset, NULL); |
346 | 0 | if (timeoutp) |
347 | 0 | *timeoutp = ptimeout_get_ms(&timeout); |
348 | 0 | errno = oerrno; |
349 | 0 | if (r > 0) |
350 | 0 | return 0; |
351 | 0 | else if (r == -1 && errno != EAGAIN && errno != EINTR) |
352 | 0 | return -1; |
353 | 0 | else if (r == 0) |
354 | 0 | break; |
355 | 0 | } |
356 | | /* timeout */ |
357 | 0 | errno = ETIMEDOUT; |
358 | 0 | return -1; |
359 | 0 | } |
360 | | |
361 | | /* |
362 | | * Wait up to *timeoutp milliseconds for fd to be readable. Updates |
363 | | * *timeoutp with time remaining. |
364 | | * Returns 0 if fd ready or -1 on timeout or error (see errno). |
365 | | */ |
366 | | int |
367 | 0 | waitrfd(int fd, int *timeoutp, volatile sig_atomic_t *stop) { |
368 | 0 | return waitfd(fd, timeoutp, POLLIN, stop); |
369 | 0 | } |
370 | | |
371 | | /* |
372 | | * Attempt a non-blocking connect(2) to the specified address, waiting up to |
373 | | * *timeoutp milliseconds for the connection to complete. If the timeout is |
374 | | * <=0, then wait indefinitely. |
375 | | * |
376 | | * Returns 0 on success or -1 on failure. |
377 | | */ |
378 | | int |
379 | | timeout_connect(int sockfd, const struct sockaddr *serv_addr, |
380 | | socklen_t addrlen, int *timeoutp) |
381 | 0 | { |
382 | 0 | int optval = 0; |
383 | 0 | socklen_t optlen = sizeof(optval); |
384 | | |
385 | | /* No timeout: just do a blocking connect() */ |
386 | 0 | if (timeoutp == NULL || *timeoutp <= 0) |
387 | 0 | return connect(sockfd, serv_addr, addrlen); |
388 | | |
389 | 0 | set_nonblock(sockfd); |
390 | 0 | for (;;) { |
391 | 0 | if (connect(sockfd, serv_addr, addrlen) == 0) { |
392 | | /* Succeeded already? */ |
393 | 0 | unset_nonblock(sockfd); |
394 | 0 | return 0; |
395 | 0 | } else if (errno == EINTR) |
396 | 0 | continue; |
397 | 0 | else if (errno != EINPROGRESS) |
398 | 0 | return -1; |
399 | 0 | break; |
400 | 0 | } |
401 | | |
402 | 0 | if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT, NULL) == -1) |
403 | 0 | return -1; |
404 | | |
405 | | /* Completed or failed */ |
406 | 0 | if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) { |
407 | 0 | debug("getsockopt: %s", strerror(errno)); |
408 | 0 | return -1; |
409 | 0 | } |
410 | 0 | if (optval != 0) { |
411 | 0 | errno = optval; |
412 | 0 | return -1; |
413 | 0 | } |
414 | 0 | unset_nonblock(sockfd); |
415 | 0 | return 0; |
416 | 0 | } |
417 | | |
418 | | /* Characters considered whitespace in strsep calls. */ |
419 | 0 | #define WHITESPACE " \t\r\n" |
420 | 0 | #define QUOTE "\"" |
421 | | |
422 | | /* return next token in configuration line */ |
423 | | static char * |
424 | | strdelim_internal(char **s, int split_equals) |
425 | 0 | { |
426 | 0 | char *old; |
427 | 0 | int wspace = 0; |
428 | |
|
429 | 0 | if (*s == NULL) |
430 | 0 | return NULL; |
431 | | |
432 | 0 | old = *s; |
433 | |
|
434 | 0 | *s = strpbrk(*s, |
435 | 0 | split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE); |
436 | 0 | if (*s == NULL) |
437 | 0 | return (old); |
438 | | |
439 | 0 | if (*s[0] == '\"') { |
440 | 0 | memmove(*s, *s + 1, strlen(*s)); /* move nul too */ |
441 | | /* Find matching quote */ |
442 | 0 | if ((*s = strpbrk(*s, QUOTE)) == NULL) { |
443 | 0 | return (NULL); /* no matching quote */ |
444 | 0 | } else { |
445 | 0 | *s[0] = '\0'; |
446 | 0 | *s += strspn(*s + 1, WHITESPACE) + 1; |
447 | 0 | return (old); |
448 | 0 | } |
449 | 0 | } |
450 | | |
451 | | /* Allow only one '=' to be skipped */ |
452 | 0 | if (split_equals && *s[0] == '=') |
453 | 0 | wspace = 1; |
454 | 0 | *s[0] = '\0'; |
455 | | |
456 | | /* Skip any extra whitespace after first token */ |
457 | 0 | *s += strspn(*s + 1, WHITESPACE) + 1; |
458 | 0 | if (split_equals && *s[0] == '=' && !wspace) |
459 | 0 | *s += strspn(*s + 1, WHITESPACE) + 1; |
460 | |
|
461 | 0 | return (old); |
462 | 0 | } |
463 | | |
464 | | /* |
465 | | * Return next token in configuration line; splts on whitespace or a |
466 | | * single '=' character. |
467 | | */ |
468 | | char * |
469 | | strdelim(char **s) |
470 | 0 | { |
471 | 0 | return strdelim_internal(s, 1); |
472 | 0 | } |
473 | | |
474 | | /* |
475 | | * Return next token in configuration line; splts on whitespace only. |
476 | | */ |
477 | | char * |
478 | | strdelimw(char **s) |
479 | 0 | { |
480 | 0 | return strdelim_internal(s, 0); |
481 | 0 | } |
482 | | |
483 | | struct passwd * |
484 | | pwcopy(struct passwd *pw) |
485 | 0 | { |
486 | 0 | struct passwd *copy = xcalloc(1, sizeof(*copy)); |
487 | |
|
488 | 0 | copy->pw_name = xstrdup(pw->pw_name); |
489 | 0 | copy->pw_passwd = xstrdup(pw->pw_passwd == NULL ? "*" : pw->pw_passwd); |
490 | 0 | #ifdef HAVE_STRUCT_PASSWD_PW_GECOS |
491 | 0 | copy->pw_gecos = xstrdup(pw->pw_gecos); |
492 | 0 | #endif |
493 | 0 | copy->pw_uid = pw->pw_uid; |
494 | 0 | copy->pw_gid = pw->pw_gid; |
495 | | #ifdef HAVE_STRUCT_PASSWD_PW_EXPIRE |
496 | | copy->pw_expire = pw->pw_expire; |
497 | | #endif |
498 | | #ifdef HAVE_STRUCT_PASSWD_PW_CHANGE |
499 | | copy->pw_change = pw->pw_change; |
500 | | #endif |
501 | | #ifdef HAVE_STRUCT_PASSWD_PW_CLASS |
502 | | copy->pw_class = xstrdup(pw->pw_class); |
503 | | #endif |
504 | 0 | copy->pw_dir = xstrdup(pw->pw_dir); |
505 | 0 | copy->pw_shell = xstrdup(pw->pw_shell); |
506 | 0 | return copy; |
507 | 0 | } |
508 | | |
509 | | /* |
510 | | * Convert ASCII string to TCP/IP port number. |
511 | | * Port must be >=0 and <=65535. |
512 | | * Return -1 if invalid. |
513 | | */ |
514 | | int |
515 | | a2port(const char *s) |
516 | 1.64k | { |
517 | 1.64k | struct servent *se; |
518 | 1.64k | long long port; |
519 | 1.64k | const char *errstr; |
520 | | |
521 | 1.64k | port = strtonum(s, 0, 65535, &errstr); |
522 | 1.64k | if (errstr == NULL) |
523 | 1.41k | return (int)port; |
524 | 226 | if ((se = getservbyname(s, "tcp")) != NULL) |
525 | 0 | return ntohs(se->s_port); |
526 | 226 | return -1; |
527 | 226 | } |
528 | | |
529 | | int |
530 | | a2tun(const char *s, int *remote) |
531 | 904 | { |
532 | 904 | const char *errstr = NULL; |
533 | 904 | char *sp, *ep; |
534 | 904 | int tun; |
535 | | |
536 | 904 | if (remote != NULL) { |
537 | 0 | *remote = SSH_TUNID_ANY; |
538 | 0 | sp = xstrdup(s); |
539 | 0 | if ((ep = strchr(sp, ':')) == NULL) { |
540 | 0 | free(sp); |
541 | 0 | return (a2tun(s, NULL)); |
542 | 0 | } |
543 | 0 | ep[0] = '\0'; ep++; |
544 | 0 | *remote = a2tun(ep, NULL); |
545 | 0 | tun = a2tun(sp, NULL); |
546 | 0 | free(sp); |
547 | 0 | return (*remote == SSH_TUNID_ERR ? *remote : tun); |
548 | 0 | } |
549 | | |
550 | 904 | if (strcasecmp(s, "any") == 0) |
551 | 194 | return (SSH_TUNID_ANY); |
552 | | |
553 | 710 | tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); |
554 | 710 | if (errstr != NULL) |
555 | 244 | return (SSH_TUNID_ERR); |
556 | | |
557 | 466 | return (tun); |
558 | 710 | } |
559 | | |
560 | 0 | #define SECONDS 1 |
561 | 0 | #define MINUTES (SECONDS * 60) |
562 | 0 | #define HOURS (MINUTES * 60) |
563 | 0 | #define DAYS (HOURS * 24) |
564 | 0 | #define WEEKS (DAYS * 7) |
565 | | |
566 | | /* |
567 | | * Convert a time string into seconds; format is |
568 | | * a sequence of: |
569 | | * time[qualifier] |
570 | | * |
571 | | * Valid time qualifiers are: |
572 | | * <none> seconds |
573 | | * s|S seconds |
574 | | * m|M minutes |
575 | | * h|H hours |
576 | | * d|D days |
577 | | * w|W weeks |
578 | | * |
579 | | * Examples: |
580 | | * 90m 90 minutes |
581 | | * 1h30m 90 minutes |
582 | | * 2d 2 days |
583 | | * 1w 1 week |
584 | | * |
585 | | * Return -1 if time string is invalid. |
586 | | */ |
587 | | int |
588 | | convtime(const char *s) |
589 | 0 | { |
590 | 0 | long total, secs, multiplier; |
591 | 0 | const char *p; |
592 | 0 | char *endp; |
593 | |
|
594 | 0 | errno = 0; |
595 | 0 | total = 0; |
596 | 0 | p = s; |
597 | |
|
598 | 0 | if (p == NULL || *p == '\0') |
599 | 0 | return -1; |
600 | | |
601 | 0 | while (*p) { |
602 | 0 | secs = strtol(p, &endp, 10); |
603 | 0 | if (p == endp || |
604 | 0 | (errno == ERANGE && (secs == INT_MIN || secs == INT_MAX)) || |
605 | 0 | secs < 0) |
606 | 0 | return -1; |
607 | | |
608 | 0 | multiplier = 1; |
609 | 0 | switch (*endp++) { |
610 | 0 | case '\0': |
611 | 0 | endp--; |
612 | 0 | break; |
613 | 0 | case 's': |
614 | 0 | case 'S': |
615 | 0 | break; |
616 | 0 | case 'm': |
617 | 0 | case 'M': |
618 | 0 | multiplier = MINUTES; |
619 | 0 | break; |
620 | 0 | case 'h': |
621 | 0 | case 'H': |
622 | 0 | multiplier = HOURS; |
623 | 0 | break; |
624 | 0 | case 'd': |
625 | 0 | case 'D': |
626 | 0 | multiplier = DAYS; |
627 | 0 | break; |
628 | 0 | case 'w': |
629 | 0 | case 'W': |
630 | 0 | multiplier = WEEKS; |
631 | 0 | break; |
632 | 0 | default: |
633 | 0 | return -1; |
634 | 0 | } |
635 | 0 | if (secs > INT_MAX / multiplier) |
636 | 0 | return -1; |
637 | 0 | secs *= multiplier; |
638 | 0 | if (total > INT_MAX - secs) |
639 | 0 | return -1; |
640 | 0 | total += secs; |
641 | 0 | if (total < 0) |
642 | 0 | return -1; |
643 | 0 | p = endp; |
644 | 0 | } |
645 | | |
646 | 0 | return total; |
647 | 0 | } |
648 | | |
649 | 0 | #define TF_BUFS 8 |
650 | 0 | #define TF_LEN 9 |
651 | | |
652 | | const char * |
653 | | fmt_timeframe(time_t t) |
654 | 0 | { |
655 | 0 | char *buf; |
656 | 0 | static char tfbuf[TF_BUFS][TF_LEN]; /* ring buffer */ |
657 | 0 | static int idx = 0; |
658 | 0 | unsigned int sec, min, hrs, day; |
659 | 0 | unsigned long long week; |
660 | |
|
661 | 0 | buf = tfbuf[idx++]; |
662 | 0 | if (idx == TF_BUFS) |
663 | 0 | idx = 0; |
664 | |
|
665 | 0 | week = t; |
666 | |
|
667 | 0 | sec = week % 60; |
668 | 0 | week /= 60; |
669 | 0 | min = week % 60; |
670 | 0 | week /= 60; |
671 | 0 | hrs = week % 24; |
672 | 0 | week /= 24; |
673 | 0 | day = week % 7; |
674 | 0 | week /= 7; |
675 | |
|
676 | 0 | if (week > 0) |
677 | 0 | snprintf(buf, TF_LEN, "%02lluw%01ud%02uh", week, day, hrs); |
678 | 0 | else if (day > 0) |
679 | 0 | snprintf(buf, TF_LEN, "%01ud%02uh%02um", day, hrs, min); |
680 | 0 | else |
681 | 0 | snprintf(buf, TF_LEN, "%02u:%02u:%02u", hrs, min, sec); |
682 | |
|
683 | 0 | return (buf); |
684 | 0 | } |
685 | | |
686 | | /* |
687 | | * Returns a standardized host+port identifier string. |
688 | | * Caller must free returned string. |
689 | | */ |
690 | | char * |
691 | | put_host_port(const char *host, u_short port) |
692 | 0 | { |
693 | 0 | char *hoststr; |
694 | |
|
695 | 0 | if (port == 0 || port == SSH_DEFAULT_PORT) |
696 | 0 | return(xstrdup(host)); |
697 | 0 | if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1) |
698 | 0 | fatal("put_host_port: asprintf: %s", strerror(errno)); |
699 | 0 | debug3("put_host_port: %s", hoststr); |
700 | 0 | return hoststr; |
701 | 0 | } |
702 | | |
703 | | /* |
704 | | * Search for next delimiter between hostnames/addresses and ports. |
705 | | * Argument may be modified (for termination). |
706 | | * Returns *cp if parsing succeeds. |
707 | | * *cp is set to the start of the next field, if one was found. |
708 | | * The delimiter char, if present, is stored in delim. |
709 | | * If this is the last field, *cp is set to NULL. |
710 | | */ |
711 | | char * |
712 | | hpdelim2(char **cp, char *delim) |
713 | 51.5k | { |
714 | 51.5k | char *s, *old; |
715 | | |
716 | 51.5k | if (cp == NULL || *cp == NULL) |
717 | 0 | return NULL; |
718 | | |
719 | 51.5k | old = s = *cp; |
720 | 51.5k | if (*s == '[') { |
721 | 196 | if ((s = strchr(s, ']')) == NULL) |
722 | 1 | return NULL; |
723 | 195 | else |
724 | 195 | s++; |
725 | 51.3k | } else if ((s = strpbrk(s, ":/")) == NULL) |
726 | 43 | s = *cp + strlen(*cp); /* skip to end (see first case below) */ |
727 | | |
728 | 51.5k | switch (*s) { |
729 | 51 | case '\0': |
730 | 51 | *cp = NULL; /* no more fields*/ |
731 | 51 | break; |
732 | | |
733 | 50.5k | case ':': |
734 | 51.5k | case '/': |
735 | 51.5k | if (delim != NULL) |
736 | 0 | *delim = *s; |
737 | 51.5k | *s = '\0'; /* terminate */ |
738 | 51.5k | *cp = s + 1; |
739 | 51.5k | break; |
740 | | |
741 | 1 | default: |
742 | 1 | return NULL; |
743 | 51.5k | } |
744 | | |
745 | 51.5k | return old; |
746 | 51.5k | } |
747 | | |
748 | | /* The common case: only accept colon as delimiter. */ |
749 | | char * |
750 | | hpdelim(char **cp) |
751 | 0 | { |
752 | 0 | char *r, delim = '\0'; |
753 | |
|
754 | 0 | r = hpdelim2(cp, &delim); |
755 | 0 | if (delim == '/') |
756 | 0 | return NULL; |
757 | 0 | return r; |
758 | 0 | } |
759 | | |
760 | | char * |
761 | | cleanhostname(char *host) |
762 | 0 | { |
763 | 0 | if (*host == '[' && host[strlen(host) - 1] == ']') { |
764 | 0 | host[strlen(host) - 1] = '\0'; |
765 | 0 | return (host + 1); |
766 | 0 | } else |
767 | 0 | return host; |
768 | 0 | } |
769 | | |
770 | | char * |
771 | | colon(char *cp) |
772 | 0 | { |
773 | 0 | int flag = 0; |
774 | |
|
775 | 0 | if (*cp == ':') /* Leading colon is part of file name. */ |
776 | 0 | return NULL; |
777 | 0 | if (*cp == '[') |
778 | 0 | flag = 1; |
779 | |
|
780 | 0 | for (; *cp; ++cp) { |
781 | 0 | if (*cp == '@' && *(cp+1) == '[') |
782 | 0 | flag = 1; |
783 | 0 | if (*cp == ']' && *(cp+1) == ':' && flag) |
784 | 0 | return (cp+1); |
785 | 0 | if (*cp == ':' && !flag) |
786 | 0 | return (cp); |
787 | 0 | if (*cp == '/') |
788 | 0 | return NULL; |
789 | 0 | } |
790 | 0 | return NULL; |
791 | 0 | } |
792 | | |
793 | | /* |
794 | | * Parse a [user@]host:[path] string. |
795 | | * Caller must free returned user, host and path. |
796 | | * Any of the pointer return arguments may be NULL (useful for syntax checking). |
797 | | * If user was not specified then *userp will be set to NULL. |
798 | | * If host was not specified then *hostp will be set to NULL. |
799 | | * If path was not specified then *pathp will be set to ".". |
800 | | * Returns 0 on success, -1 on failure. |
801 | | */ |
802 | | int |
803 | | parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp) |
804 | 0 | { |
805 | 0 | char *user = NULL, *host = NULL, *path = NULL; |
806 | 0 | char *sdup, *tmp; |
807 | 0 | int ret = -1; |
808 | |
|
809 | 0 | if (userp != NULL) |
810 | 0 | *userp = NULL; |
811 | 0 | if (hostp != NULL) |
812 | 0 | *hostp = NULL; |
813 | 0 | if (pathp != NULL) |
814 | 0 | *pathp = NULL; |
815 | |
|
816 | 0 | sdup = xstrdup(s); |
817 | | |
818 | | /* Check for remote syntax: [user@]host:[path] */ |
819 | 0 | if ((tmp = colon(sdup)) == NULL) |
820 | 0 | goto out; |
821 | | |
822 | | /* Extract optional path */ |
823 | 0 | *tmp++ = '\0'; |
824 | 0 | if (*tmp == '\0') |
825 | 0 | tmp = "."; |
826 | 0 | path = xstrdup(tmp); |
827 | | |
828 | | /* Extract optional user and mandatory host */ |
829 | 0 | tmp = strrchr(sdup, '@'); |
830 | 0 | if (tmp != NULL) { |
831 | 0 | *tmp++ = '\0'; |
832 | 0 | host = xstrdup(cleanhostname(tmp)); |
833 | 0 | if (*sdup != '\0') |
834 | 0 | user = xstrdup(sdup); |
835 | 0 | } else { |
836 | 0 | host = xstrdup(cleanhostname(sdup)); |
837 | 0 | user = NULL; |
838 | 0 | } |
839 | | |
840 | | /* Success */ |
841 | 0 | if (userp != NULL) { |
842 | 0 | *userp = user; |
843 | 0 | user = NULL; |
844 | 0 | } |
845 | 0 | if (hostp != NULL) { |
846 | 0 | *hostp = host; |
847 | 0 | host = NULL; |
848 | 0 | } |
849 | 0 | if (pathp != NULL) { |
850 | 0 | *pathp = path; |
851 | 0 | path = NULL; |
852 | 0 | } |
853 | 0 | ret = 0; |
854 | 0 | out: |
855 | 0 | free(sdup); |
856 | 0 | free(user); |
857 | 0 | free(host); |
858 | 0 | free(path); |
859 | 0 | return ret; |
860 | 0 | } |
861 | | |
862 | | /* |
863 | | * Parse a [user@]host[:port] string. |
864 | | * Caller must free returned user and host. |
865 | | * Any of the pointer return arguments may be NULL (useful for syntax checking). |
866 | | * If user was not specified then *userp will be set to NULL. |
867 | | * If port was not specified then *portp will be -1. |
868 | | * Returns 0 on success, -1 on failure. |
869 | | */ |
870 | | int |
871 | | parse_user_host_port(const char *s, char **userp, char **hostp, int *portp) |
872 | 0 | { |
873 | 0 | char *sdup, *cp, *tmp; |
874 | 0 | char *user = NULL, *host = NULL; |
875 | 0 | int port = -1, ret = -1; |
876 | |
|
877 | 0 | if (userp != NULL) |
878 | 0 | *userp = NULL; |
879 | 0 | if (hostp != NULL) |
880 | 0 | *hostp = NULL; |
881 | 0 | if (portp != NULL) |
882 | 0 | *portp = -1; |
883 | |
|
884 | 0 | if ((sdup = tmp = strdup(s)) == NULL) |
885 | 0 | return -1; |
886 | | /* Extract optional username */ |
887 | 0 | if ((cp = strrchr(tmp, '@')) != NULL) { |
888 | 0 | *cp = '\0'; |
889 | 0 | if (*tmp == '\0') |
890 | 0 | goto out; |
891 | 0 | if ((user = strdup(tmp)) == NULL) |
892 | 0 | goto out; |
893 | 0 | tmp = cp + 1; |
894 | 0 | } |
895 | | /* Extract mandatory hostname */ |
896 | 0 | if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0') |
897 | 0 | goto out; |
898 | 0 | host = xstrdup(cleanhostname(cp)); |
899 | | /* Convert and verify optional port */ |
900 | 0 | if (tmp != NULL && *tmp != '\0') { |
901 | 0 | if ((port = a2port(tmp)) <= 0) |
902 | 0 | goto out; |
903 | 0 | } |
904 | | /* Success */ |
905 | 0 | if (userp != NULL) { |
906 | 0 | *userp = user; |
907 | 0 | user = NULL; |
908 | 0 | } |
909 | 0 | if (hostp != NULL) { |
910 | 0 | *hostp = host; |
911 | 0 | host = NULL; |
912 | 0 | } |
913 | 0 | if (portp != NULL) |
914 | 0 | *portp = port; |
915 | 0 | ret = 0; |
916 | 0 | out: |
917 | 0 | free(sdup); |
918 | 0 | free(user); |
919 | 0 | free(host); |
920 | 0 | return ret; |
921 | 0 | } |
922 | | |
923 | | /* |
924 | | * Converts a two-byte hex string to decimal. |
925 | | * Returns the decimal value or -1 for invalid input. |
926 | | */ |
927 | | static int |
928 | | hexchar(const char *s) |
929 | 0 | { |
930 | 0 | unsigned char result[2]; |
931 | 0 | int i; |
932 | |
|
933 | 0 | for (i = 0; i < 2; i++) { |
934 | 0 | if (s[i] >= '0' && s[i] <= '9') |
935 | 0 | result[i] = (unsigned char)(s[i] - '0'); |
936 | 0 | else if (s[i] >= 'a' && s[i] <= 'f') |
937 | 0 | result[i] = (unsigned char)(s[i] - 'a') + 10; |
938 | 0 | else if (s[i] >= 'A' && s[i] <= 'F') |
939 | 0 | result[i] = (unsigned char)(s[i] - 'A') + 10; |
940 | 0 | else |
941 | 0 | return -1; |
942 | 0 | } |
943 | 0 | return (result[0] << 4) | result[1]; |
944 | 0 | } |
945 | | |
946 | | /* |
947 | | * Decode an url-encoded string. |
948 | | * Returns a newly allocated string on success or NULL on failure. |
949 | | */ |
950 | | static char * |
951 | | urldecode(const char *src) |
952 | 0 | { |
953 | 0 | char *ret, *dst; |
954 | 0 | int ch; |
955 | 0 | size_t srclen; |
956 | |
|
957 | 0 | if ((srclen = strlen(src)) >= SIZE_MAX) |
958 | 0 | fatal_f("input too large"); |
959 | 0 | ret = xmalloc(srclen + 1); |
960 | 0 | for (dst = ret; *src != '\0'; src++) { |
961 | 0 | switch (*src) { |
962 | 0 | case '+': |
963 | 0 | *dst++ = ' '; |
964 | 0 | break; |
965 | 0 | case '%': |
966 | 0 | if (!isxdigit((unsigned char)src[1]) || |
967 | 0 | !isxdigit((unsigned char)src[2]) || |
968 | 0 | (ch = hexchar(src + 1)) == -1) { |
969 | 0 | free(ret); |
970 | 0 | return NULL; |
971 | 0 | } |
972 | 0 | *dst++ = ch; |
973 | 0 | src += 2; |
974 | 0 | break; |
975 | 0 | default: |
976 | 0 | *dst++ = *src; |
977 | 0 | break; |
978 | 0 | } |
979 | 0 | } |
980 | 0 | *dst = '\0'; |
981 | |
|
982 | 0 | return ret; |
983 | 0 | } |
984 | | |
985 | | /* |
986 | | * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI. |
987 | | * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04 |
988 | | * Either user or path may be url-encoded (but not host or port). |
989 | | * Caller must free returned user, host and path. |
990 | | * Any of the pointer return arguments may be NULL (useful for syntax checking) |
991 | | * but the scheme must always be specified. |
992 | | * If user was not specified then *userp will be set to NULL. |
993 | | * If port was not specified then *portp will be -1. |
994 | | * If path was not specified then *pathp will be set to NULL. |
995 | | * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri. |
996 | | */ |
997 | | int |
998 | | parse_uri(const char *scheme, const char *uri, char **userp, char **hostp, |
999 | | int *portp, char **pathp) |
1000 | 0 | { |
1001 | 0 | char *uridup, *cp, *tmp, ch; |
1002 | 0 | char *user = NULL, *host = NULL, *path = NULL; |
1003 | 0 | int port = -1, ret = -1; |
1004 | 0 | size_t len; |
1005 | |
|
1006 | 0 | len = strlen(scheme); |
1007 | 0 | if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0) |
1008 | 0 | return 1; |
1009 | 0 | uri += len + 3; |
1010 | |
|
1011 | 0 | if (userp != NULL) |
1012 | 0 | *userp = NULL; |
1013 | 0 | if (hostp != NULL) |
1014 | 0 | *hostp = NULL; |
1015 | 0 | if (portp != NULL) |
1016 | 0 | *portp = -1; |
1017 | 0 | if (pathp != NULL) |
1018 | 0 | *pathp = NULL; |
1019 | |
|
1020 | 0 | uridup = tmp = xstrdup(uri); |
1021 | | |
1022 | | /* Extract optional ssh-info (username + connection params) */ |
1023 | 0 | if ((cp = strchr(tmp, '@')) != NULL) { |
1024 | 0 | char *delim; |
1025 | |
|
1026 | 0 | *cp = '\0'; |
1027 | | /* Extract username and connection params */ |
1028 | 0 | if ((delim = strchr(tmp, ';')) != NULL) { |
1029 | | /* Just ignore connection params for now */ |
1030 | 0 | *delim = '\0'; |
1031 | 0 | } |
1032 | 0 | if (*tmp == '\0') { |
1033 | | /* Empty username */ |
1034 | 0 | goto out; |
1035 | 0 | } |
1036 | 0 | if ((user = urldecode(tmp)) == NULL) |
1037 | 0 | goto out; |
1038 | 0 | tmp = cp + 1; |
1039 | 0 | } |
1040 | | |
1041 | | /* Extract mandatory hostname */ |
1042 | 0 | if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0') |
1043 | 0 | goto out; |
1044 | 0 | host = xstrdup(cleanhostname(cp)); |
1045 | 0 | if (!valid_domain(host, 0, NULL)) |
1046 | 0 | goto out; |
1047 | | |
1048 | 0 | if (tmp != NULL && *tmp != '\0') { |
1049 | 0 | if (ch == ':') { |
1050 | | /* Convert and verify port. */ |
1051 | 0 | if ((cp = strchr(tmp, '/')) != NULL) |
1052 | 0 | *cp = '\0'; |
1053 | 0 | if ((port = a2port(tmp)) <= 0) |
1054 | 0 | goto out; |
1055 | 0 | tmp = cp ? cp + 1 : NULL; |
1056 | 0 | } |
1057 | 0 | if (tmp != NULL && *tmp != '\0') { |
1058 | | /* Extract optional path */ |
1059 | 0 | if ((path = urldecode(tmp)) == NULL) |
1060 | 0 | goto out; |
1061 | 0 | } |
1062 | 0 | } |
1063 | | |
1064 | | /* Success */ |
1065 | 0 | if (userp != NULL) { |
1066 | 0 | *userp = user; |
1067 | 0 | user = NULL; |
1068 | 0 | } |
1069 | 0 | if (hostp != NULL) { |
1070 | 0 | *hostp = host; |
1071 | 0 | host = NULL; |
1072 | 0 | } |
1073 | 0 | if (portp != NULL) |
1074 | 0 | *portp = port; |
1075 | 0 | if (pathp != NULL) { |
1076 | 0 | *pathp = path; |
1077 | 0 | path = NULL; |
1078 | 0 | } |
1079 | 0 | ret = 0; |
1080 | 0 | out: |
1081 | 0 | free(uridup); |
1082 | 0 | free(user); |
1083 | 0 | free(host); |
1084 | 0 | free(path); |
1085 | 0 | return ret; |
1086 | 0 | } |
1087 | | |
1088 | | /* function to assist building execv() arguments */ |
1089 | | void |
1090 | | addargs(arglist *args, char *fmt, ...) |
1091 | 0 | { |
1092 | 0 | va_list ap; |
1093 | 0 | char *cp; |
1094 | 0 | u_int nalloc; |
1095 | 0 | int r; |
1096 | |
|
1097 | 0 | va_start(ap, fmt); |
1098 | 0 | r = vasprintf(&cp, fmt, ap); |
1099 | 0 | va_end(ap); |
1100 | 0 | if (r == -1) |
1101 | 0 | fatal_f("argument too long"); |
1102 | | |
1103 | 0 | nalloc = args->nalloc; |
1104 | 0 | if (args->list == NULL) { |
1105 | 0 | nalloc = 32; |
1106 | 0 | args->num = 0; |
1107 | 0 | } else if (args->num > (256 * 1024)) |
1108 | 0 | fatal_f("too many arguments"); |
1109 | 0 | else if (args->num >= args->nalloc) |
1110 | 0 | fatal_f("arglist corrupt"); |
1111 | 0 | else if (args->num+2 >= nalloc) |
1112 | 0 | nalloc *= 2; |
1113 | | |
1114 | 0 | args->list = xrecallocarray(args->list, args->nalloc, |
1115 | 0 | nalloc, sizeof(char *)); |
1116 | 0 | args->nalloc = nalloc; |
1117 | 0 | args->list[args->num++] = cp; |
1118 | 0 | args->list[args->num] = NULL; |
1119 | 0 | } |
1120 | | |
1121 | | void |
1122 | | replacearg(arglist *args, u_int which, char *fmt, ...) |
1123 | 0 | { |
1124 | 0 | va_list ap; |
1125 | 0 | char *cp; |
1126 | 0 | int r; |
1127 | |
|
1128 | 0 | va_start(ap, fmt); |
1129 | 0 | r = vasprintf(&cp, fmt, ap); |
1130 | 0 | va_end(ap); |
1131 | 0 | if (r == -1) |
1132 | 0 | fatal_f("argument too long"); |
1133 | 0 | if (args->list == NULL || args->num >= args->nalloc) |
1134 | 0 | fatal_f("arglist corrupt"); |
1135 | | |
1136 | 0 | if (which >= args->num) |
1137 | 0 | fatal_f("tried to replace invalid arg %d >= %d", |
1138 | 0 | which, args->num); |
1139 | 0 | free(args->list[which]); |
1140 | 0 | args->list[which] = cp; |
1141 | 0 | } |
1142 | | |
1143 | | void |
1144 | | freeargs(arglist *args) |
1145 | 0 | { |
1146 | 0 | u_int i; |
1147 | |
|
1148 | 0 | if (args == NULL) |
1149 | 0 | return; |
1150 | 0 | if (args->list != NULL && args->num < args->nalloc) { |
1151 | 0 | for (i = 0; i < args->num; i++) |
1152 | 0 | free(args->list[i]); |
1153 | 0 | free(args->list); |
1154 | 0 | } |
1155 | 0 | args->nalloc = args->num = 0; |
1156 | 0 | args->list = NULL; |
1157 | 0 | } |
1158 | | |
1159 | | /* |
1160 | | * Expands tildes in the file name. Returns data allocated by xmalloc. |
1161 | | * Warning: this calls getpw*. |
1162 | | */ |
1163 | | int |
1164 | | tilde_expand(const char *filename, uid_t uid, char **retp) |
1165 | 0 | { |
1166 | 0 | char *ocopy = NULL, *copy, *s = NULL; |
1167 | 0 | const char *path = NULL, *user = NULL; |
1168 | 0 | struct passwd *pw; |
1169 | 0 | size_t len; |
1170 | 0 | int ret = -1, r, slash; |
1171 | |
|
1172 | 0 | *retp = NULL; |
1173 | 0 | if (*filename != '~') { |
1174 | 0 | *retp = xstrdup(filename); |
1175 | 0 | return 0; |
1176 | 0 | } |
1177 | 0 | ocopy = copy = xstrdup(filename + 1); |
1178 | |
|
1179 | 0 | if (*copy == '\0') /* ~ */ |
1180 | 0 | path = NULL; |
1181 | 0 | else if (*copy == '/') { |
1182 | 0 | copy += strspn(copy, "/"); |
1183 | 0 | if (*copy == '\0') |
1184 | 0 | path = NULL; /* ~/ */ |
1185 | 0 | else |
1186 | 0 | path = copy; /* ~/path */ |
1187 | 0 | } else { |
1188 | 0 | user = copy; |
1189 | 0 | if ((path = strchr(copy, '/')) != NULL) { |
1190 | 0 | copy[path - copy] = '\0'; |
1191 | 0 | path++; |
1192 | 0 | path += strspn(path, "/"); |
1193 | 0 | if (*path == '\0') /* ~user/ */ |
1194 | 0 | path = NULL; |
1195 | | /* else ~user/path */ |
1196 | 0 | } |
1197 | | /* else ~user */ |
1198 | 0 | } |
1199 | 0 | if (user != NULL) { |
1200 | 0 | if ((pw = getpwnam(user)) == NULL) { |
1201 | 0 | error_f("No such user %s", user); |
1202 | 0 | goto out; |
1203 | 0 | } |
1204 | 0 | } else if ((pw = getpwuid(uid)) == NULL) { |
1205 | 0 | error_f("No such uid %ld", (long)uid); |
1206 | 0 | goto out; |
1207 | 0 | } |
1208 | | |
1209 | | /* Make sure directory has a trailing '/' */ |
1210 | 0 | slash = (len = strlen(pw->pw_dir)) == 0 || pw->pw_dir[len - 1] != '/'; |
1211 | |
|
1212 | 0 | if ((r = xasprintf(&s, "%s%s%s", pw->pw_dir, |
1213 | 0 | slash ? "/" : "", path != NULL ? path : "")) <= 0) { |
1214 | 0 | error_f("xasprintf failed"); |
1215 | 0 | goto out; |
1216 | 0 | } |
1217 | 0 | if (r >= PATH_MAX) { |
1218 | 0 | error_f("Path too long"); |
1219 | 0 | goto out; |
1220 | 0 | } |
1221 | | /* success */ |
1222 | 0 | ret = 0; |
1223 | 0 | *retp = s; |
1224 | 0 | s = NULL; |
1225 | 0 | out: |
1226 | 0 | free(s); |
1227 | 0 | free(ocopy); |
1228 | 0 | return ret; |
1229 | 0 | } |
1230 | | |
1231 | | char * |
1232 | | tilde_expand_filename(const char *filename, uid_t uid) |
1233 | 0 | { |
1234 | 0 | char *ret; |
1235 | |
|
1236 | 0 | if (tilde_expand(filename, uid, &ret) != 0) |
1237 | 0 | cleanup_exit(255); |
1238 | 0 | return ret; |
1239 | 0 | } |
1240 | | |
1241 | | /* |
1242 | | * Expand a string with a set of %[char] escapes and/or ${ENVIRONMENT} |
1243 | | * substitutions. A number of escapes may be specified as |
1244 | | * (char *escape_chars, char *replacement) pairs. The list must be terminated |
1245 | | * by a NULL escape_char. Returns replaced string in memory allocated by |
1246 | | * xmalloc which the caller must free. |
1247 | | */ |
1248 | | static char * |
1249 | | vdollar_percent_expand(int *parseerror, int dollar, int percent, |
1250 | | const char *string, va_list ap) |
1251 | 0 | { |
1252 | 0 | #define EXPAND_MAX_KEYS 64 |
1253 | 0 | u_int num_keys = 0, i; |
1254 | 0 | struct { |
1255 | 0 | const char *key; |
1256 | 0 | const char *repl; |
1257 | 0 | } keys[EXPAND_MAX_KEYS]; |
1258 | 0 | struct sshbuf *buf; |
1259 | 0 | int r, missingvar = 0; |
1260 | 0 | char *ret = NULL, *var, *varend, *val; |
1261 | 0 | size_t len; |
1262 | |
|
1263 | 0 | if ((buf = sshbuf_new()) == NULL) |
1264 | 0 | fatal_f("sshbuf_new failed"); |
1265 | 0 | if (parseerror == NULL) |
1266 | 0 | fatal_f("null parseerror arg"); |
1267 | 0 | *parseerror = 1; |
1268 | | |
1269 | | /* Gather keys if we're doing percent expansion. */ |
1270 | 0 | if (percent) { |
1271 | 0 | for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { |
1272 | 0 | keys[num_keys].key = va_arg(ap, char *); |
1273 | 0 | if (keys[num_keys].key == NULL) |
1274 | 0 | break; |
1275 | 0 | keys[num_keys].repl = va_arg(ap, char *); |
1276 | 0 | if (keys[num_keys].repl == NULL) { |
1277 | 0 | fatal_f("NULL replacement for token %s", |
1278 | 0 | keys[num_keys].key); |
1279 | 0 | } |
1280 | 0 | } |
1281 | 0 | if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) |
1282 | 0 | fatal_f("too many keys"); |
1283 | 0 | if (num_keys == 0) |
1284 | 0 | fatal_f("percent expansion without token list"); |
1285 | 0 | } |
1286 | | |
1287 | | /* Expand string */ |
1288 | 0 | for (i = 0; *string != '\0'; string++) { |
1289 | | /* Optionally process ${ENVIRONMENT} expansions. */ |
1290 | 0 | if (dollar && string[0] == '$' && string[1] == '{') { |
1291 | 0 | string += 2; /* skip over '${' */ |
1292 | 0 | if ((varend = strchr(string, '}')) == NULL) { |
1293 | 0 | error_f("environment variable '%s' missing " |
1294 | 0 | "closing '}'", string); |
1295 | 0 | goto out; |
1296 | 0 | } |
1297 | 0 | len = varend - string; |
1298 | 0 | if (len == 0) { |
1299 | 0 | error_f("zero-length environment variable"); |
1300 | 0 | goto out; |
1301 | 0 | } |
1302 | 0 | var = xmalloc(len + 1); |
1303 | 0 | (void)strlcpy(var, string, len + 1); |
1304 | 0 | if ((val = getenv(var)) == NULL) { |
1305 | 0 | error_f("env var ${%s} has no value", var); |
1306 | 0 | missingvar = 1; |
1307 | 0 | } else { |
1308 | 0 | debug3_f("expand ${%s} -> '%s'", var, val); |
1309 | 0 | if ((r = sshbuf_put(buf, val, strlen(val))) !=0) |
1310 | 0 | fatal_fr(r, "sshbuf_put ${}"); |
1311 | 0 | } |
1312 | 0 | free(var); |
1313 | 0 | string += len; |
1314 | 0 | continue; |
1315 | 0 | } |
1316 | | |
1317 | | /* |
1318 | | * Process percent expansions if we have a list of TOKENs. |
1319 | | * If we're not doing percent expansion everything just gets |
1320 | | * appended here. |
1321 | | */ |
1322 | 0 | if (*string != '%' || !percent) { |
1323 | 0 | append: |
1324 | 0 | if ((r = sshbuf_put_u8(buf, *string)) != 0) |
1325 | 0 | fatal_fr(r, "sshbuf_put_u8 %%"); |
1326 | 0 | continue; |
1327 | 0 | } |
1328 | 0 | string++; |
1329 | | /* %% case */ |
1330 | 0 | if (*string == '%') |
1331 | 0 | goto append; |
1332 | 0 | if (*string == '\0') { |
1333 | 0 | error_f("invalid format"); |
1334 | 0 | goto out; |
1335 | 0 | } |
1336 | 0 | for (i = 0; i < num_keys; i++) { |
1337 | 0 | if (strchr(keys[i].key, *string) != NULL) { |
1338 | 0 | if ((r = sshbuf_put(buf, keys[i].repl, |
1339 | 0 | strlen(keys[i].repl))) != 0) |
1340 | 0 | fatal_fr(r, "sshbuf_put %%-repl"); |
1341 | 0 | break; |
1342 | 0 | } |
1343 | 0 | } |
1344 | 0 | if (i >= num_keys) { |
1345 | 0 | error_f("unknown key %%%c", *string); |
1346 | 0 | goto out; |
1347 | 0 | } |
1348 | 0 | } |
1349 | 0 | if (!missingvar && (ret = sshbuf_dup_string(buf)) == NULL) |
1350 | 0 | fatal_f("sshbuf_dup_string failed"); |
1351 | 0 | *parseerror = 0; |
1352 | 0 | out: |
1353 | 0 | sshbuf_free(buf); |
1354 | 0 | return *parseerror ? NULL : ret; |
1355 | 0 | #undef EXPAND_MAX_KEYS |
1356 | 0 | } |
1357 | | |
1358 | | /* |
1359 | | * Expand only environment variables. |
1360 | | * Note that although this function is variadic like the other similar |
1361 | | * functions, any such arguments will be unused. |
1362 | | */ |
1363 | | |
1364 | | char * |
1365 | | dollar_expand(int *parseerr, const char *string, ...) |
1366 | 0 | { |
1367 | 0 | char *ret; |
1368 | 0 | int err; |
1369 | 0 | va_list ap; |
1370 | |
|
1371 | 0 | va_start(ap, string); |
1372 | 0 | ret = vdollar_percent_expand(&err, 1, 0, string, ap); |
1373 | 0 | va_end(ap); |
1374 | 0 | if (parseerr != NULL) |
1375 | 0 | *parseerr = err; |
1376 | 0 | return ret; |
1377 | 0 | } |
1378 | | |
1379 | | /* |
1380 | | * Returns expanded string or NULL if a specified environment variable is |
1381 | | * not defined, or calls fatal if the string is invalid. |
1382 | | */ |
1383 | | char * |
1384 | | percent_expand(const char *string, ...) |
1385 | 0 | { |
1386 | 0 | char *ret; |
1387 | 0 | int err; |
1388 | 0 | va_list ap; |
1389 | |
|
1390 | 0 | va_start(ap, string); |
1391 | 0 | ret = vdollar_percent_expand(&err, 0, 1, string, ap); |
1392 | 0 | va_end(ap); |
1393 | 0 | if (err) |
1394 | 0 | fatal_f("failed"); |
1395 | 0 | return ret; |
1396 | 0 | } |
1397 | | |
1398 | | /* |
1399 | | * Returns expanded string or NULL if a specified environment variable is |
1400 | | * not defined, or calls fatal if the string is invalid. |
1401 | | */ |
1402 | | char * |
1403 | | percent_dollar_expand(const char *string, ...) |
1404 | 0 | { |
1405 | 0 | char *ret; |
1406 | 0 | int err; |
1407 | 0 | va_list ap; |
1408 | |
|
1409 | 0 | va_start(ap, string); |
1410 | 0 | ret = vdollar_percent_expand(&err, 1, 1, string, ap); |
1411 | 0 | va_end(ap); |
1412 | 0 | if (err) |
1413 | 0 | fatal_f("failed"); |
1414 | 0 | return ret; |
1415 | 0 | } |
1416 | | |
1417 | | int |
1418 | | tun_open(int tun, int mode, char **ifname) |
1419 | 0 | { |
1420 | 0 | #if defined(CUSTOM_SYS_TUN_OPEN) |
1421 | 0 | return (sys_tun_open(tun, mode, ifname)); |
1422 | | #elif defined(SSH_TUN_OPENBSD) |
1423 | | struct ifreq ifr; |
1424 | | char name[100]; |
1425 | | int fd = -1, sock; |
1426 | | const char *tunbase = "tun"; |
1427 | | |
1428 | | if (ifname != NULL) |
1429 | | *ifname = NULL; |
1430 | | |
1431 | | if (mode == SSH_TUNMODE_ETHERNET) |
1432 | | tunbase = "tap"; |
1433 | | |
1434 | | /* Open the tunnel device */ |
1435 | | if (tun <= SSH_TUNID_MAX) { |
1436 | | snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); |
1437 | | fd = open(name, O_RDWR); |
1438 | | } else if (tun == SSH_TUNID_ANY) { |
1439 | | for (tun = 100; tun >= 0; tun--) { |
1440 | | snprintf(name, sizeof(name), "/dev/%s%d", |
1441 | | tunbase, tun); |
1442 | | if ((fd = open(name, O_RDWR)) >= 0) |
1443 | | break; |
1444 | | } |
1445 | | } else { |
1446 | | debug_f("invalid tunnel %u", tun); |
1447 | | return -1; |
1448 | | } |
1449 | | |
1450 | | if (fd == -1) { |
1451 | | debug_f("%s open: %s", name, strerror(errno)); |
1452 | | return -1; |
1453 | | } |
1454 | | |
1455 | | debug_f("%s mode %d fd %d", name, mode, fd); |
1456 | | |
1457 | | /* Bring interface up if it is not already */ |
1458 | | snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); |
1459 | | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) |
1460 | | goto failed; |
1461 | | |
1462 | | if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) { |
1463 | | debug_f("get interface %s flags: %s", ifr.ifr_name, |
1464 | | strerror(errno)); |
1465 | | goto failed; |
1466 | | } |
1467 | | |
1468 | | if (!(ifr.ifr_flags & IFF_UP)) { |
1469 | | ifr.ifr_flags |= IFF_UP; |
1470 | | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) { |
1471 | | debug_f("activate interface %s: %s", ifr.ifr_name, |
1472 | | strerror(errno)); |
1473 | | goto failed; |
1474 | | } |
1475 | | } |
1476 | | |
1477 | | if (ifname != NULL) |
1478 | | *ifname = xstrdup(ifr.ifr_name); |
1479 | | |
1480 | | close(sock); |
1481 | | return fd; |
1482 | | |
1483 | | failed: |
1484 | | if (fd >= 0) |
1485 | | close(fd); |
1486 | | if (sock >= 0) |
1487 | | close(sock); |
1488 | | return -1; |
1489 | | #else |
1490 | | error("Tunnel interfaces are not supported on this platform"); |
1491 | | return (-1); |
1492 | | #endif |
1493 | 0 | } |
1494 | | |
1495 | | void |
1496 | | sanitise_stdfd(void) |
1497 | 0 | { |
1498 | 0 | int nullfd, dupfd; |
1499 | |
|
1500 | 0 | if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { |
1501 | 0 | fprintf(stderr, "Couldn't open /dev/null: %s\n", |
1502 | 0 | strerror(errno)); |
1503 | 0 | exit(1); |
1504 | 0 | } |
1505 | 0 | while (++dupfd <= STDERR_FILENO) { |
1506 | | /* Only populate closed fds. */ |
1507 | 0 | if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) { |
1508 | 0 | if (dup2(nullfd, dupfd) == -1) { |
1509 | 0 | fprintf(stderr, "dup2: %s\n", strerror(errno)); |
1510 | 0 | exit(1); |
1511 | 0 | } |
1512 | 0 | } |
1513 | 0 | } |
1514 | 0 | if (nullfd > STDERR_FILENO) |
1515 | 0 | close(nullfd); |
1516 | 0 | } |
1517 | | |
1518 | | char * |
1519 | | tohex(const void *vp, size_t l) |
1520 | 2.26k | { |
1521 | 2.26k | const u_char *p = (const u_char *)vp; |
1522 | 2.26k | char b[3], *r; |
1523 | 2.26k | size_t i, hl; |
1524 | | |
1525 | 2.26k | if (l > 65536) |
1526 | 0 | return xstrdup("tohex: length > 65536"); |
1527 | | |
1528 | 2.26k | hl = l * 2 + 1; |
1529 | 2.26k | r = xcalloc(1, hl); |
1530 | 113k | for (i = 0; i < l; i++) { |
1531 | 110k | snprintf(b, sizeof(b), "%02x", p[i]); |
1532 | 110k | strlcat(r, b, hl); |
1533 | 110k | } |
1534 | 2.26k | return (r); |
1535 | 2.26k | } |
1536 | | |
1537 | | /* |
1538 | | * Extend string *sp by the specified format. If *sp is not NULL (or empty), |
1539 | | * then the separator 'sep' will be prepended before the formatted arguments. |
1540 | | * Extended strings are heap allocated. |
1541 | | */ |
1542 | | void |
1543 | | xextendf(char **sp, const char *sep, const char *fmt, ...) |
1544 | 0 | { |
1545 | 0 | va_list ap; |
1546 | 0 | char *tmp1, *tmp2; |
1547 | |
|
1548 | 0 | va_start(ap, fmt); |
1549 | 0 | xvasprintf(&tmp1, fmt, ap); |
1550 | 0 | va_end(ap); |
1551 | |
|
1552 | 0 | if (*sp == NULL || **sp == '\0') { |
1553 | 0 | free(*sp); |
1554 | 0 | *sp = tmp1; |
1555 | 0 | return; |
1556 | 0 | } |
1557 | 0 | xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL ? "" : sep, tmp1); |
1558 | 0 | free(tmp1); |
1559 | 0 | free(*sp); |
1560 | 0 | *sp = tmp2; |
1561 | 0 | } |
1562 | | |
1563 | | |
1564 | | u_int64_t |
1565 | | get_u64(const void *vp) |
1566 | 0 | { |
1567 | 0 | const u_char *p = (const u_char *)vp; |
1568 | 0 | u_int64_t v; |
1569 | |
|
1570 | 0 | v = (u_int64_t)p[0] << 56; |
1571 | 0 | v |= (u_int64_t)p[1] << 48; |
1572 | 0 | v |= (u_int64_t)p[2] << 40; |
1573 | 0 | v |= (u_int64_t)p[3] << 32; |
1574 | 0 | v |= (u_int64_t)p[4] << 24; |
1575 | 0 | v |= (u_int64_t)p[5] << 16; |
1576 | 0 | v |= (u_int64_t)p[6] << 8; |
1577 | 0 | v |= (u_int64_t)p[7]; |
1578 | |
|
1579 | 0 | return (v); |
1580 | 0 | } |
1581 | | |
1582 | | u_int32_t |
1583 | | get_u32(const void *vp) |
1584 | 259k | { |
1585 | 259k | const u_char *p = (const u_char *)vp; |
1586 | 259k | u_int32_t v; |
1587 | | |
1588 | 259k | v = (u_int32_t)p[0] << 24; |
1589 | 259k | v |= (u_int32_t)p[1] << 16; |
1590 | 259k | v |= (u_int32_t)p[2] << 8; |
1591 | 259k | v |= (u_int32_t)p[3]; |
1592 | | |
1593 | 259k | return (v); |
1594 | 259k | } |
1595 | | |
1596 | | u_int32_t |
1597 | | get_u32_le(const void *vp) |
1598 | 4.19M | { |
1599 | 4.19M | const u_char *p = (const u_char *)vp; |
1600 | 4.19M | u_int32_t v; |
1601 | | |
1602 | 4.19M | v = (u_int32_t)p[0]; |
1603 | 4.19M | v |= (u_int32_t)p[1] << 8; |
1604 | 4.19M | v |= (u_int32_t)p[2] << 16; |
1605 | 4.19M | v |= (u_int32_t)p[3] << 24; |
1606 | | |
1607 | 4.19M | return (v); |
1608 | 4.19M | } |
1609 | | |
1610 | | u_int16_t |
1611 | | get_u16(const void *vp) |
1612 | 0 | { |
1613 | 0 | const u_char *p = (const u_char *)vp; |
1614 | 0 | u_int16_t v; |
1615 | |
|
1616 | 0 | v = (u_int16_t)p[0] << 8; |
1617 | 0 | v |= (u_int16_t)p[1]; |
1618 | |
|
1619 | 0 | return (v); |
1620 | 0 | } |
1621 | | |
1622 | | void |
1623 | | put_u64(void *vp, u_int64_t v) |
1624 | 55.5k | { |
1625 | 55.5k | u_char *p = (u_char *)vp; |
1626 | | |
1627 | 55.5k | p[0] = (u_char)(v >> 56) & 0xff; |
1628 | 55.5k | p[1] = (u_char)(v >> 48) & 0xff; |
1629 | 55.5k | p[2] = (u_char)(v >> 40) & 0xff; |
1630 | 55.5k | p[3] = (u_char)(v >> 32) & 0xff; |
1631 | 55.5k | p[4] = (u_char)(v >> 24) & 0xff; |
1632 | 55.5k | p[5] = (u_char)(v >> 16) & 0xff; |
1633 | 55.5k | p[6] = (u_char)(v >> 8) & 0xff; |
1634 | 55.5k | p[7] = (u_char)v & 0xff; |
1635 | 55.5k | } |
1636 | | |
1637 | | void |
1638 | | put_u32(void *vp, u_int32_t v) |
1639 | 620k | { |
1640 | 620k | u_char *p = (u_char *)vp; |
1641 | | |
1642 | 620k | p[0] = (u_char)(v >> 24) & 0xff; |
1643 | 620k | p[1] = (u_char)(v >> 16) & 0xff; |
1644 | 620k | p[2] = (u_char)(v >> 8) & 0xff; |
1645 | 620k | p[3] = (u_char)v & 0xff; |
1646 | 620k | } |
1647 | | |
1648 | | void |
1649 | | put_u32_le(void *vp, u_int32_t v) |
1650 | 0 | { |
1651 | 0 | u_char *p = (u_char *)vp; |
1652 | |
|
1653 | 0 | p[0] = (u_char)v & 0xff; |
1654 | 0 | p[1] = (u_char)(v >> 8) & 0xff; |
1655 | 0 | p[2] = (u_char)(v >> 16) & 0xff; |
1656 | 0 | p[3] = (u_char)(v >> 24) & 0xff; |
1657 | 0 | } |
1658 | | |
1659 | | void |
1660 | | put_u16(void *vp, u_int16_t v) |
1661 | 0 | { |
1662 | 0 | u_char *p = (u_char *)vp; |
1663 | |
|
1664 | 0 | p[0] = (u_char)(v >> 8) & 0xff; |
1665 | 0 | p[1] = (u_char)v & 0xff; |
1666 | 0 | } |
1667 | | |
1668 | | void |
1669 | | ms_subtract_diff(struct timeval *start, int *ms) |
1670 | 0 | { |
1671 | 0 | struct timeval diff, finish; |
1672 | |
|
1673 | 0 | monotime_tv(&finish); |
1674 | 0 | timersub(&finish, start, &diff); |
1675 | 0 | *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); |
1676 | 0 | } |
1677 | | |
1678 | | void |
1679 | | ms_to_timespec(struct timespec *ts, int ms) |
1680 | 0 | { |
1681 | 0 | if (ms < 0) |
1682 | 0 | ms = 0; |
1683 | 0 | ts->tv_sec = ms / 1000; |
1684 | 0 | ts->tv_nsec = (ms % 1000) * 1000 * 1000; |
1685 | 0 | } |
1686 | | |
1687 | | void |
1688 | | monotime_ts(struct timespec *ts) |
1689 | 797 | { |
1690 | 797 | struct timeval tv; |
1691 | 797 | #if defined(HAVE_CLOCK_GETTIME) && (defined(CLOCK_BOOTTIME) || \ |
1692 | 797 | defined(CLOCK_MONOTONIC) || defined(CLOCK_REALTIME)) |
1693 | 797 | static int gettime_failed = 0; |
1694 | | |
1695 | 797 | if (!gettime_failed) { |
1696 | 797 | # ifdef CLOCK_BOOTTIME |
1697 | 797 | if (clock_gettime(CLOCK_BOOTTIME, ts) == 0) |
1698 | 797 | return; |
1699 | 0 | # endif /* CLOCK_BOOTTIME */ |
1700 | 0 | # ifdef CLOCK_MONOTONIC |
1701 | 0 | if (clock_gettime(CLOCK_MONOTONIC, ts) == 0) |
1702 | 0 | return; |
1703 | 0 | # endif /* CLOCK_MONOTONIC */ |
1704 | 0 | # ifdef CLOCK_REALTIME |
1705 | | /* Not monotonic, but we're almost out of options here. */ |
1706 | 0 | if (clock_gettime(CLOCK_REALTIME, ts) == 0) |
1707 | 0 | return; |
1708 | 0 | # endif /* CLOCK_REALTIME */ |
1709 | 0 | debug3("clock_gettime: %s", strerror(errno)); |
1710 | 0 | gettime_failed = 1; |
1711 | 0 | } |
1712 | 0 | #endif /* HAVE_CLOCK_GETTIME && (BOOTTIME || MONOTONIC || REALTIME) */ |
1713 | 0 | gettimeofday(&tv, NULL); |
1714 | 0 | ts->tv_sec = tv.tv_sec; |
1715 | 0 | ts->tv_nsec = (long)tv.tv_usec * 1000; |
1716 | 0 | } |
1717 | | |
1718 | | void |
1719 | | monotime_tv(struct timeval *tv) |
1720 | 0 | { |
1721 | 0 | struct timespec ts; |
1722 | |
|
1723 | 0 | monotime_ts(&ts); |
1724 | 0 | tv->tv_sec = ts.tv_sec; |
1725 | 0 | tv->tv_usec = ts.tv_nsec / 1000; |
1726 | 0 | } |
1727 | | |
1728 | | time_t |
1729 | | monotime(void) |
1730 | 797 | { |
1731 | 797 | struct timespec ts; |
1732 | | |
1733 | 797 | monotime_ts(&ts); |
1734 | 797 | return ts.tv_sec; |
1735 | 797 | } |
1736 | | |
1737 | | double |
1738 | | monotime_double(void) |
1739 | 0 | { |
1740 | 0 | struct timespec ts; |
1741 | |
|
1742 | 0 | monotime_ts(&ts); |
1743 | 0 | return ts.tv_sec + ((double)ts.tv_nsec / 1000000000); |
1744 | 0 | } |
1745 | | |
1746 | | void |
1747 | | bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) |
1748 | 0 | { |
1749 | 0 | bw->buflen = buflen; |
1750 | 0 | bw->rate = kbps; |
1751 | 0 | bw->thresh = buflen; |
1752 | 0 | bw->lamt = 0; |
1753 | 0 | timerclear(&bw->bwstart); |
1754 | 0 | timerclear(&bw->bwend); |
1755 | 0 | } |
1756 | | |
1757 | | /* Callback from read/write loop to insert bandwidth-limiting delays */ |
1758 | | void |
1759 | | bandwidth_limit(struct bwlimit *bw, size_t read_len) |
1760 | 0 | { |
1761 | 0 | u_int64_t waitlen; |
1762 | 0 | struct timespec ts, rm; |
1763 | |
|
1764 | 0 | bw->lamt += read_len; |
1765 | 0 | if (!timerisset(&bw->bwstart)) { |
1766 | 0 | monotime_tv(&bw->bwstart); |
1767 | 0 | return; |
1768 | 0 | } |
1769 | 0 | if (bw->lamt < bw->thresh) |
1770 | 0 | return; |
1771 | | |
1772 | 0 | monotime_tv(&bw->bwend); |
1773 | 0 | timersub(&bw->bwend, &bw->bwstart, &bw->bwend); |
1774 | 0 | if (!timerisset(&bw->bwend)) |
1775 | 0 | return; |
1776 | | |
1777 | 0 | bw->lamt *= 8; |
1778 | 0 | waitlen = (double)1000000L * bw->lamt / bw->rate; |
1779 | |
|
1780 | 0 | bw->bwstart.tv_sec = waitlen / 1000000L; |
1781 | 0 | bw->bwstart.tv_usec = waitlen % 1000000L; |
1782 | |
|
1783 | 0 | if (timercmp(&bw->bwstart, &bw->bwend, >)) { |
1784 | 0 | timersub(&bw->bwstart, &bw->bwend, &bw->bwend); |
1785 | | |
1786 | | /* Adjust the wait time */ |
1787 | 0 | if (bw->bwend.tv_sec) { |
1788 | 0 | bw->thresh /= 2; |
1789 | 0 | if (bw->thresh < bw->buflen / 4) |
1790 | 0 | bw->thresh = bw->buflen / 4; |
1791 | 0 | } else if (bw->bwend.tv_usec < 10000) { |
1792 | 0 | bw->thresh *= 2; |
1793 | 0 | if (bw->thresh > bw->buflen * 8) |
1794 | 0 | bw->thresh = bw->buflen * 8; |
1795 | 0 | } |
1796 | |
|
1797 | 0 | TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); |
1798 | 0 | while (nanosleep(&ts, &rm) == -1) { |
1799 | 0 | if (errno != EINTR) |
1800 | 0 | break; |
1801 | 0 | ts = rm; |
1802 | 0 | } |
1803 | 0 | } |
1804 | |
|
1805 | 0 | bw->lamt = 0; |
1806 | 0 | monotime_tv(&bw->bwstart); |
1807 | 0 | } |
1808 | | |
1809 | | /* Make a template filename for mk[sd]temp() */ |
1810 | | void |
1811 | | mktemp_proto(char *s, size_t len) |
1812 | 0 | { |
1813 | 0 | const char *tmpdir; |
1814 | 0 | int r; |
1815 | |
|
1816 | 0 | if ((tmpdir = getenv("TMPDIR")) != NULL) { |
1817 | 0 | r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); |
1818 | 0 | if (r > 0 && (size_t)r < len) |
1819 | 0 | return; |
1820 | 0 | } |
1821 | 0 | r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); |
1822 | 0 | if (r < 0 || (size_t)r >= len) |
1823 | 0 | fatal_f("template string too short"); |
1824 | 0 | } |
1825 | | |
1826 | | static const struct { |
1827 | | const char *name; |
1828 | | int value; |
1829 | | } ipqos[] = { |
1830 | | { "none", INT_MAX }, /* can't use 0 here; that's CS0 */ |
1831 | | { "af11", IPTOS_DSCP_AF11 }, |
1832 | | { "af12", IPTOS_DSCP_AF12 }, |
1833 | | { "af13", IPTOS_DSCP_AF13 }, |
1834 | | { "af21", IPTOS_DSCP_AF21 }, |
1835 | | { "af22", IPTOS_DSCP_AF22 }, |
1836 | | { "af23", IPTOS_DSCP_AF23 }, |
1837 | | { "af31", IPTOS_DSCP_AF31 }, |
1838 | | { "af32", IPTOS_DSCP_AF32 }, |
1839 | | { "af33", IPTOS_DSCP_AF33 }, |
1840 | | { "af41", IPTOS_DSCP_AF41 }, |
1841 | | { "af42", IPTOS_DSCP_AF42 }, |
1842 | | { "af43", IPTOS_DSCP_AF43 }, |
1843 | | { "cs0", IPTOS_DSCP_CS0 }, |
1844 | | { "cs1", IPTOS_DSCP_CS1 }, |
1845 | | { "cs2", IPTOS_DSCP_CS2 }, |
1846 | | { "cs3", IPTOS_DSCP_CS3 }, |
1847 | | { "cs4", IPTOS_DSCP_CS4 }, |
1848 | | { "cs5", IPTOS_DSCP_CS5 }, |
1849 | | { "cs6", IPTOS_DSCP_CS6 }, |
1850 | | { "cs7", IPTOS_DSCP_CS7 }, |
1851 | | { "ef", IPTOS_DSCP_EF }, |
1852 | | { "le", IPTOS_DSCP_LE }, |
1853 | | { "lowdelay", IPTOS_LOWDELAY }, |
1854 | | { "throughput", IPTOS_THROUGHPUT }, |
1855 | | { "reliability", IPTOS_RELIABILITY }, |
1856 | | { NULL, -1 } |
1857 | | }; |
1858 | | |
1859 | | int |
1860 | | parse_ipqos(const char *cp) |
1861 | 0 | { |
1862 | 0 | u_int i; |
1863 | 0 | char *ep; |
1864 | 0 | long val; |
1865 | |
|
1866 | 0 | if (cp == NULL) |
1867 | 0 | return -1; |
1868 | 0 | for (i = 0; ipqos[i].name != NULL; i++) { |
1869 | 0 | if (strcasecmp(cp, ipqos[i].name) == 0) |
1870 | 0 | return ipqos[i].value; |
1871 | 0 | } |
1872 | | /* Try parsing as an integer */ |
1873 | 0 | val = strtol(cp, &ep, 0); |
1874 | 0 | if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) |
1875 | 0 | return -1; |
1876 | 0 | return val; |
1877 | 0 | } |
1878 | | |
1879 | | const char * |
1880 | | iptos2str(int iptos) |
1881 | 0 | { |
1882 | 0 | int i; |
1883 | 0 | static char iptos_str[sizeof "0xff"]; |
1884 | |
|
1885 | 0 | for (i = 0; ipqos[i].name != NULL; i++) { |
1886 | 0 | if (ipqos[i].value == iptos) |
1887 | 0 | return ipqos[i].name; |
1888 | 0 | } |
1889 | 0 | snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); |
1890 | 0 | return iptos_str; |
1891 | 0 | } |
1892 | | |
1893 | | void |
1894 | | lowercase(char *s) |
1895 | 0 | { |
1896 | 0 | for (; *s; s++) |
1897 | 0 | *s = tolower((u_char)*s); |
1898 | 0 | } |
1899 | | |
1900 | | int |
1901 | | unix_listener(const char *path, int backlog, int unlink_first) |
1902 | 0 | { |
1903 | 0 | struct sockaddr_un sunaddr; |
1904 | 0 | int saved_errno, sock; |
1905 | |
|
1906 | 0 | memset(&sunaddr, 0, sizeof(sunaddr)); |
1907 | 0 | sunaddr.sun_family = AF_UNIX; |
1908 | 0 | if (strlcpy(sunaddr.sun_path, path, |
1909 | 0 | sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { |
1910 | 0 | error_f("path \"%s\" too long for Unix domain socket", path); |
1911 | 0 | errno = ENAMETOOLONG; |
1912 | 0 | return -1; |
1913 | 0 | } |
1914 | | |
1915 | 0 | sock = socket(PF_UNIX, SOCK_STREAM, 0); |
1916 | 0 | if (sock == -1) { |
1917 | 0 | saved_errno = errno; |
1918 | 0 | error_f("socket: %.100s", strerror(errno)); |
1919 | 0 | errno = saved_errno; |
1920 | 0 | return -1; |
1921 | 0 | } |
1922 | 0 | if (unlink_first == 1) { |
1923 | 0 | if (unlink(path) != 0 && errno != ENOENT) |
1924 | 0 | error("unlink(%s): %.100s", path, strerror(errno)); |
1925 | 0 | } |
1926 | 0 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) { |
1927 | 0 | saved_errno = errno; |
1928 | 0 | error_f("cannot bind to path %s: %s", path, strerror(errno)); |
1929 | 0 | close(sock); |
1930 | 0 | errno = saved_errno; |
1931 | 0 | return -1; |
1932 | 0 | } |
1933 | 0 | if (listen(sock, backlog) == -1) { |
1934 | 0 | saved_errno = errno; |
1935 | 0 | error_f("cannot listen on path %s: %s", path, strerror(errno)); |
1936 | 0 | close(sock); |
1937 | 0 | unlink(path); |
1938 | 0 | errno = saved_errno; |
1939 | 0 | return -1; |
1940 | 0 | } |
1941 | 0 | return sock; |
1942 | 0 | } |
1943 | | |
1944 | | void |
1945 | | sock_set_v6only(int s) |
1946 | 0 | { |
1947 | 0 | #if defined(IPV6_V6ONLY) && !defined(__OpenBSD__) |
1948 | 0 | int on = 1; |
1949 | |
|
1950 | 0 | debug3("%s: set socket %d IPV6_V6ONLY", __func__, s); |
1951 | 0 | if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1) |
1952 | 0 | error("setsockopt IPV6_V6ONLY: %s", strerror(errno)); |
1953 | 0 | #endif |
1954 | 0 | } |
1955 | | |
1956 | | /* |
1957 | | * Compares two strings that maybe be NULL. Returns non-zero if strings |
1958 | | * are both NULL or are identical, returns zero otherwise. |
1959 | | */ |
1960 | | static int |
1961 | | strcmp_maybe_null(const char *a, const char *b) |
1962 | 0 | { |
1963 | 0 | if ((a == NULL && b != NULL) || (a != NULL && b == NULL)) |
1964 | 0 | return 0; |
1965 | 0 | if (a != NULL && strcmp(a, b) != 0) |
1966 | 0 | return 0; |
1967 | 0 | return 1; |
1968 | 0 | } |
1969 | | |
1970 | | /* |
1971 | | * Compare two forwards, returning non-zero if they are identical or |
1972 | | * zero otherwise. |
1973 | | */ |
1974 | | int |
1975 | | forward_equals(const struct Forward *a, const struct Forward *b) |
1976 | 0 | { |
1977 | 0 | if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0) |
1978 | 0 | return 0; |
1979 | 0 | if (a->listen_port != b->listen_port) |
1980 | 0 | return 0; |
1981 | 0 | if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0) |
1982 | 0 | return 0; |
1983 | 0 | if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0) |
1984 | 0 | return 0; |
1985 | 0 | if (a->connect_port != b->connect_port) |
1986 | 0 | return 0; |
1987 | 0 | if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0) |
1988 | 0 | return 0; |
1989 | | /* allocated_port and handle are not checked */ |
1990 | 0 | return 1; |
1991 | 0 | } |
1992 | | |
1993 | | /* returns 1 if process is already daemonized, 0 otherwise */ |
1994 | | int |
1995 | | daemonized(void) |
1996 | 0 | { |
1997 | 0 | int fd; |
1998 | |
|
1999 | 0 | if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) { |
2000 | 0 | close(fd); |
2001 | 0 | return 0; /* have controlling terminal */ |
2002 | 0 | } |
2003 | 0 | if (getppid() != 1) |
2004 | 0 | return 0; /* parent is not init */ |
2005 | 0 | if (getsid(0) != getpid()) |
2006 | 0 | return 0; /* not session leader */ |
2007 | 0 | debug3("already daemonized"); |
2008 | 0 | return 1; |
2009 | 0 | } |
2010 | | |
2011 | | /* |
2012 | | * Splits 's' into an argument vector. Handles quoted string and basic |
2013 | | * escape characters (\\, \", \'). Caller must free the argument vector |
2014 | | * and its members. |
2015 | | */ |
2016 | | int |
2017 | | argv_split(const char *s, int *argcp, char ***argvp, int terminate_on_comment) |
2018 | 0 | { |
2019 | 0 | int r = SSH_ERR_INTERNAL_ERROR; |
2020 | 0 | int argc = 0, quote, i, j; |
2021 | 0 | char *arg, **argv = xcalloc(1, sizeof(*argv)); |
2022 | |
|
2023 | 0 | *argvp = NULL; |
2024 | 0 | *argcp = 0; |
2025 | |
|
2026 | 0 | for (i = 0; s[i] != '\0'; i++) { |
2027 | | /* Skip leading whitespace */ |
2028 | 0 | if (s[i] == ' ' || s[i] == '\t') |
2029 | 0 | continue; |
2030 | 0 | if (terminate_on_comment && s[i] == '#') |
2031 | 0 | break; |
2032 | | /* Start of a token */ |
2033 | 0 | quote = 0; |
2034 | |
|
2035 | 0 | argv = xreallocarray(argv, (argc + 2), sizeof(*argv)); |
2036 | 0 | arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1); |
2037 | 0 | argv[argc] = NULL; |
2038 | | |
2039 | | /* Copy the token in, removing escapes */ |
2040 | 0 | for (j = 0; s[i] != '\0'; i++) { |
2041 | 0 | if (s[i] == '\\') { |
2042 | 0 | if (s[i + 1] == '\'' || |
2043 | 0 | s[i + 1] == '\"' || |
2044 | 0 | s[i + 1] == '\\' || |
2045 | 0 | (quote == 0 && s[i + 1] == ' ')) { |
2046 | 0 | i++; /* Skip '\' */ |
2047 | 0 | arg[j++] = s[i]; |
2048 | 0 | } else { |
2049 | | /* Unrecognised escape */ |
2050 | 0 | arg[j++] = s[i]; |
2051 | 0 | } |
2052 | 0 | } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t')) |
2053 | 0 | break; /* done */ |
2054 | 0 | else if (quote == 0 && (s[i] == '\"' || s[i] == '\'')) |
2055 | 0 | quote = s[i]; /* quote start */ |
2056 | 0 | else if (quote != 0 && s[i] == quote) |
2057 | 0 | quote = 0; /* quote end */ |
2058 | 0 | else |
2059 | 0 | arg[j++] = s[i]; |
2060 | 0 | } |
2061 | 0 | if (s[i] == '\0') { |
2062 | 0 | if (quote != 0) { |
2063 | | /* Ran out of string looking for close quote */ |
2064 | 0 | r = SSH_ERR_INVALID_FORMAT; |
2065 | 0 | goto out; |
2066 | 0 | } |
2067 | 0 | break; |
2068 | 0 | } |
2069 | 0 | } |
2070 | | /* Success */ |
2071 | 0 | *argcp = argc; |
2072 | 0 | *argvp = argv; |
2073 | 0 | argc = 0; |
2074 | 0 | argv = NULL; |
2075 | 0 | r = 0; |
2076 | 0 | out: |
2077 | 0 | if (argc != 0 && argv != NULL) { |
2078 | 0 | for (i = 0; i < argc; i++) |
2079 | 0 | free(argv[i]); |
2080 | 0 | free(argv); |
2081 | 0 | } |
2082 | 0 | return r; |
2083 | 0 | } |
2084 | | |
2085 | | /* |
2086 | | * Reassemble an argument vector into a string, quoting and escaping as |
2087 | | * necessary. Caller must free returned string. |
2088 | | */ |
2089 | | char * |
2090 | | argv_assemble(int argc, char **argv) |
2091 | 0 | { |
2092 | 0 | int i, j, ws, r; |
2093 | 0 | char c, *ret; |
2094 | 0 | struct sshbuf *buf, *arg; |
2095 | |
|
2096 | 0 | if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL) |
2097 | 0 | fatal_f("sshbuf_new failed"); |
2098 | | |
2099 | 0 | for (i = 0; i < argc; i++) { |
2100 | 0 | ws = 0; |
2101 | 0 | sshbuf_reset(arg); |
2102 | 0 | for (j = 0; argv[i][j] != '\0'; j++) { |
2103 | 0 | r = 0; |
2104 | 0 | c = argv[i][j]; |
2105 | 0 | switch (c) { |
2106 | 0 | case ' ': |
2107 | 0 | case '\t': |
2108 | 0 | ws = 1; |
2109 | 0 | r = sshbuf_put_u8(arg, c); |
2110 | 0 | break; |
2111 | 0 | case '\\': |
2112 | 0 | case '\'': |
2113 | 0 | case '"': |
2114 | 0 | if ((r = sshbuf_put_u8(arg, '\\')) != 0) |
2115 | 0 | break; |
2116 | | /* FALLTHROUGH */ |
2117 | 0 | default: |
2118 | 0 | r = sshbuf_put_u8(arg, c); |
2119 | 0 | break; |
2120 | 0 | } |
2121 | 0 | if (r != 0) |
2122 | 0 | fatal_fr(r, "sshbuf_put_u8"); |
2123 | 0 | } |
2124 | 0 | if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) || |
2125 | 0 | (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) || |
2126 | 0 | (r = sshbuf_putb(buf, arg)) != 0 || |
2127 | 0 | (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0)) |
2128 | 0 | fatal_fr(r, "assemble"); |
2129 | 0 | } |
2130 | 0 | if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL) |
2131 | 0 | fatal_f("malloc failed"); |
2132 | 0 | memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf)); |
2133 | 0 | ret[sshbuf_len(buf)] = '\0'; |
2134 | 0 | sshbuf_free(buf); |
2135 | 0 | sshbuf_free(arg); |
2136 | 0 | return ret; |
2137 | 0 | } |
2138 | | |
2139 | | char * |
2140 | | argv_next(int *argcp, char ***argvp) |
2141 | 0 | { |
2142 | 0 | char *ret = (*argvp)[0]; |
2143 | |
|
2144 | 0 | if (*argcp > 0 && ret != NULL) { |
2145 | 0 | (*argcp)--; |
2146 | 0 | (*argvp)++; |
2147 | 0 | } |
2148 | 0 | return ret; |
2149 | 0 | } |
2150 | | |
2151 | | void |
2152 | | argv_consume(int *argcp) |
2153 | 0 | { |
2154 | 0 | *argcp = 0; |
2155 | 0 | } |
2156 | | |
2157 | | void |
2158 | | argv_free(char **av, int ac) |
2159 | 0 | { |
2160 | 0 | int i; |
2161 | |
|
2162 | 0 | if (av == NULL) |
2163 | 0 | return; |
2164 | 0 | for (i = 0; i < ac; i++) |
2165 | 0 | free(av[i]); |
2166 | 0 | free(av); |
2167 | 0 | } |
2168 | | |
2169 | | /* Returns 0 if pid exited cleanly, non-zero otherwise */ |
2170 | | int |
2171 | | exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet) |
2172 | 0 | { |
2173 | 0 | int status; |
2174 | |
|
2175 | 0 | while (waitpid(pid, &status, 0) == -1) { |
2176 | 0 | if (errno != EINTR) { |
2177 | 0 | error("%s waitpid: %s", tag, strerror(errno)); |
2178 | 0 | return -1; |
2179 | 0 | } |
2180 | 0 | } |
2181 | 0 | if (WIFSIGNALED(status)) { |
2182 | 0 | error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status)); |
2183 | 0 | return -1; |
2184 | 0 | } else if (WEXITSTATUS(status) != 0) { |
2185 | 0 | do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO, |
2186 | 0 | "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status)); |
2187 | 0 | return -1; |
2188 | 0 | } |
2189 | 0 | return 0; |
2190 | 0 | } |
2191 | | |
2192 | | /* |
2193 | | * Check a given path for security. This is defined as all components |
2194 | | * of the path to the file must be owned by either the owner of |
2195 | | * of the file or root and no directories must be group or world writable. |
2196 | | * |
2197 | | * XXX Should any specific check be done for sym links ? |
2198 | | * |
2199 | | * Takes a file name, its stat information (preferably from fstat() to |
2200 | | * avoid races), the uid of the expected owner, their home directory and an |
2201 | | * error buffer plus max size as arguments. |
2202 | | * |
2203 | | * Returns 0 on success and -1 on failure |
2204 | | */ |
2205 | | int |
2206 | | safe_path(const char *name, struct stat *stp, const char *pw_dir, |
2207 | | uid_t uid, char *err, size_t errlen) |
2208 | 0 | { |
2209 | 0 | char buf[PATH_MAX], homedir[PATH_MAX]; |
2210 | 0 | char *cp; |
2211 | 0 | int comparehome = 0; |
2212 | 0 | struct stat st; |
2213 | |
|
2214 | 0 | if (realpath(name, buf) == NULL) { |
2215 | 0 | snprintf(err, errlen, "realpath %s failed: %s", name, |
2216 | 0 | strerror(errno)); |
2217 | 0 | return -1; |
2218 | 0 | } |
2219 | 0 | if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) |
2220 | 0 | comparehome = 1; |
2221 | |
|
2222 | 0 | if (!S_ISREG(stp->st_mode)) { |
2223 | 0 | snprintf(err, errlen, "%s is not a regular file", buf); |
2224 | 0 | return -1; |
2225 | 0 | } |
2226 | 0 | if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) || |
2227 | 0 | (stp->st_mode & 022) != 0) { |
2228 | 0 | snprintf(err, errlen, "bad ownership or modes for file %s", |
2229 | 0 | buf); |
2230 | 0 | return -1; |
2231 | 0 | } |
2232 | | |
2233 | | /* for each component of the canonical path, walking upwards */ |
2234 | 0 | for (;;) { |
2235 | 0 | if ((cp = dirname(buf)) == NULL) { |
2236 | 0 | snprintf(err, errlen, "dirname() failed"); |
2237 | 0 | return -1; |
2238 | 0 | } |
2239 | 0 | strlcpy(buf, cp, sizeof(buf)); |
2240 | |
|
2241 | 0 | if (stat(buf, &st) == -1 || |
2242 | 0 | (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) || |
2243 | 0 | (st.st_mode & 022) != 0) { |
2244 | 0 | snprintf(err, errlen, |
2245 | 0 | "bad ownership or modes for directory %s", buf); |
2246 | 0 | return -1; |
2247 | 0 | } |
2248 | | |
2249 | | /* If are past the homedir then we can stop */ |
2250 | 0 | if (comparehome && strcmp(homedir, buf) == 0) |
2251 | 0 | break; |
2252 | | |
2253 | | /* |
2254 | | * dirname should always complete with a "/" path, |
2255 | | * but we can be paranoid and check for "." too |
2256 | | */ |
2257 | 0 | if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) |
2258 | 0 | break; |
2259 | 0 | } |
2260 | 0 | return 0; |
2261 | 0 | } |
2262 | | |
2263 | | /* |
2264 | | * Version of safe_path() that accepts an open file descriptor to |
2265 | | * avoid races. |
2266 | | * |
2267 | | * Returns 0 on success and -1 on failure |
2268 | | */ |
2269 | | int |
2270 | | safe_path_fd(int fd, const char *file, struct passwd *pw, |
2271 | | char *err, size_t errlen) |
2272 | 0 | { |
2273 | 0 | struct stat st; |
2274 | | |
2275 | | /* check the open file to avoid races */ |
2276 | 0 | if (fstat(fd, &st) == -1) { |
2277 | 0 | snprintf(err, errlen, "cannot stat file %s: %s", |
2278 | 0 | file, strerror(errno)); |
2279 | 0 | return -1; |
2280 | 0 | } |
2281 | 0 | return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); |
2282 | 0 | } |
2283 | | |
2284 | | /* |
2285 | | * Sets the value of the given variable in the environment. If the variable |
2286 | | * already exists, its value is overridden. |
2287 | | */ |
2288 | | void |
2289 | | child_set_env(char ***envp, u_int *envsizep, const char *name, |
2290 | | const char *value) |
2291 | 0 | { |
2292 | 0 | char **env; |
2293 | 0 | u_int envsize; |
2294 | 0 | u_int i, namelen; |
2295 | |
|
2296 | 0 | if (strchr(name, '=') != NULL) { |
2297 | 0 | error("Invalid environment variable \"%.100s\"", name); |
2298 | 0 | return; |
2299 | 0 | } |
2300 | | |
2301 | | /* |
2302 | | * If we're passed an uninitialized list, allocate a single null |
2303 | | * entry before continuing. |
2304 | | */ |
2305 | 0 | if ((*envp == NULL) != (*envsizep == 0)) |
2306 | 0 | fatal_f("environment size mismatch"); |
2307 | 0 | if (*envp == NULL && *envsizep == 0) { |
2308 | 0 | *envp = xmalloc(sizeof(char *)); |
2309 | 0 | *envp[0] = NULL; |
2310 | 0 | *envsizep = 1; |
2311 | 0 | } |
2312 | | |
2313 | | /* |
2314 | | * Find the slot where the value should be stored. If the variable |
2315 | | * already exists, we reuse the slot; otherwise we append a new slot |
2316 | | * at the end of the array, expanding if necessary. |
2317 | | */ |
2318 | 0 | env = *envp; |
2319 | 0 | namelen = strlen(name); |
2320 | 0 | for (i = 0; env[i]; i++) |
2321 | 0 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') |
2322 | 0 | break; |
2323 | 0 | if (env[i]) { |
2324 | | /* Reuse the slot. */ |
2325 | 0 | free(env[i]); |
2326 | 0 | } else { |
2327 | | /* New variable. Expand if necessary. */ |
2328 | 0 | envsize = *envsizep; |
2329 | 0 | if (i >= envsize - 1) { |
2330 | 0 | if (envsize >= 1000) |
2331 | 0 | fatal("child_set_env: too many env vars"); |
2332 | 0 | envsize += 50; |
2333 | 0 | env = (*envp) = xreallocarray(env, envsize, sizeof(char *)); |
2334 | 0 | *envsizep = envsize; |
2335 | 0 | } |
2336 | | /* Need to set the NULL pointer at end of array beyond the new slot. */ |
2337 | 0 | env[i + 1] = NULL; |
2338 | 0 | } |
2339 | | |
2340 | | /* Allocate space and format the variable in the appropriate slot. */ |
2341 | | /* XXX xasprintf */ |
2342 | 0 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); |
2343 | 0 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); |
2344 | 0 | } |
2345 | | |
2346 | | /* |
2347 | | * Check and optionally lowercase a domain name, also removes trailing '.' |
2348 | | * Returns 1 on success and 0 on failure, storing an error message in errstr. |
2349 | | */ |
2350 | | int |
2351 | | valid_domain(char *name, int makelower, const char **errstr) |
2352 | 0 | { |
2353 | 0 | size_t i, l = strlen(name); |
2354 | 0 | u_char c, last = '\0'; |
2355 | 0 | static char errbuf[256]; |
2356 | |
|
2357 | 0 | if (l == 0) { |
2358 | 0 | strlcpy(errbuf, "empty domain name", sizeof(errbuf)); |
2359 | 0 | goto bad; |
2360 | 0 | } |
2361 | 0 | if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) { |
2362 | 0 | snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" " |
2363 | 0 | "starts with invalid character", name); |
2364 | 0 | goto bad; |
2365 | 0 | } |
2366 | 0 | for (i = 0; i < l; i++) { |
2367 | 0 | c = tolower((u_char)name[i]); |
2368 | 0 | if (makelower) |
2369 | 0 | name[i] = (char)c; |
2370 | 0 | if (last == '.' && c == '.') { |
2371 | 0 | snprintf(errbuf, sizeof(errbuf), "domain name " |
2372 | 0 | "\"%.100s\" contains consecutive separators", name); |
2373 | 0 | goto bad; |
2374 | 0 | } |
2375 | 0 | if (c != '.' && c != '-' && !isalnum(c) && |
2376 | 0 | c != '_') /* technically invalid, but common */ { |
2377 | 0 | snprintf(errbuf, sizeof(errbuf), "domain name " |
2378 | 0 | "\"%.100s\" contains invalid characters", name); |
2379 | 0 | goto bad; |
2380 | 0 | } |
2381 | 0 | last = c; |
2382 | 0 | } |
2383 | 0 | if (name[l - 1] == '.') |
2384 | 0 | name[l - 1] = '\0'; |
2385 | 0 | if (errstr != NULL) |
2386 | 0 | *errstr = NULL; |
2387 | 0 | return 1; |
2388 | 0 | bad: |
2389 | 0 | if (errstr != NULL) |
2390 | 0 | *errstr = errbuf; |
2391 | 0 | return 0; |
2392 | 0 | } |
2393 | | |
2394 | | /* |
2395 | | * Verify that a environment variable name (not including initial '$') is |
2396 | | * valid; consisting of one or more alphanumeric or underscore characters only. |
2397 | | * Returns 1 on valid, 0 otherwise. |
2398 | | */ |
2399 | | int |
2400 | | valid_env_name(const char *name) |
2401 | 32.1k | { |
2402 | 32.1k | const char *cp; |
2403 | | |
2404 | 32.1k | if (name[0] == '\0') |
2405 | 7 | return 0; |
2406 | 66.9k | for (cp = name; *cp != '\0'; cp++) { |
2407 | 34.8k | if (!isalnum((u_char)*cp) && *cp != '_') |
2408 | 10 | return 0; |
2409 | 34.8k | } |
2410 | 32.1k | return 1; |
2411 | 32.1k | } |
2412 | | |
2413 | | const char * |
2414 | | atoi_err(const char *nptr, int *val) |
2415 | 0 | { |
2416 | 0 | const char *errstr = NULL; |
2417 | 0 | long long num; |
2418 | |
|
2419 | 0 | if (nptr == NULL || *nptr == '\0') |
2420 | 0 | return "missing"; |
2421 | 0 | num = strtonum(nptr, 0, INT_MAX, &errstr); |
2422 | 0 | if (errstr == NULL) |
2423 | 0 | *val = (int)num; |
2424 | 0 | return errstr; |
2425 | 0 | } |
2426 | | |
2427 | | int |
2428 | | parse_absolute_time(const char *s, uint64_t *tp) |
2429 | 2.93k | { |
2430 | 2.93k | struct tm tm; |
2431 | 2.93k | time_t tt; |
2432 | 2.93k | char buf[32], *fmt; |
2433 | 2.93k | const char *cp; |
2434 | 2.93k | size_t l; |
2435 | 2.93k | int is_utc = 0; |
2436 | | |
2437 | 2.93k | *tp = 0; |
2438 | | |
2439 | 2.93k | l = strlen(s); |
2440 | 2.93k | if (l > 1 && strcasecmp(s + l - 1, "Z") == 0) { |
2441 | 552 | is_utc = 1; |
2442 | 552 | l--; |
2443 | 2.37k | } else if (l > 3 && strcasecmp(s + l - 3, "UTC") == 0) { |
2444 | 197 | is_utc = 1; |
2445 | 197 | l -= 3; |
2446 | 197 | } |
2447 | | /* |
2448 | | * POSIX strptime says "The application shall ensure that there |
2449 | | * is white-space or other non-alphanumeric characters between |
2450 | | * any two conversion specifications" so arrange things this way. |
2451 | | */ |
2452 | 2.93k | switch (l) { |
2453 | 2.12k | case 8: /* YYYYMMDD */ |
2454 | 2.12k | fmt = "%Y-%m-%d"; |
2455 | 2.12k | snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); |
2456 | 2.12k | break; |
2457 | 306 | case 12: /* YYYYMMDDHHMM */ |
2458 | 306 | fmt = "%Y-%m-%dT%H:%M"; |
2459 | 306 | snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s", |
2460 | 306 | s, s + 4, s + 6, s + 8, s + 10); |
2461 | 306 | break; |
2462 | 298 | case 14: /* YYYYMMDDHHMMSS */ |
2463 | 298 | fmt = "%Y-%m-%dT%H:%M:%S"; |
2464 | 298 | snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", |
2465 | 298 | s, s + 4, s + 6, s + 8, s + 10, s + 12); |
2466 | 298 | break; |
2467 | 204 | default: |
2468 | 204 | return SSH_ERR_INVALID_FORMAT; |
2469 | 2.93k | } |
2470 | | |
2471 | 2.72k | memset(&tm, 0, sizeof(tm)); |
2472 | 2.72k | if ((cp = strptime(buf, fmt, &tm)) == NULL || *cp != '\0') |
2473 | 25 | return SSH_ERR_INVALID_FORMAT; |
2474 | 2.70k | if (is_utc) { |
2475 | 727 | if ((tt = timegm(&tm)) < 0) |
2476 | 95 | return SSH_ERR_INVALID_FORMAT; |
2477 | 1.97k | } else { |
2478 | 1.97k | if ((tt = mktime(&tm)) < 0) |
2479 | 96 | return SSH_ERR_INVALID_FORMAT; |
2480 | 1.97k | } |
2481 | | /* success */ |
2482 | 2.51k | *tp = (uint64_t)tt; |
2483 | 2.51k | return 0; |
2484 | 2.70k | } |
2485 | | |
2486 | | void |
2487 | | format_absolute_time(uint64_t t, char *buf, size_t len) |
2488 | 0 | { |
2489 | 0 | time_t tt = t > SSH_TIME_T_MAX ? SSH_TIME_T_MAX : t; |
2490 | 0 | struct tm tm; |
2491 | |
|
2492 | 0 | localtime_r(&tt, &tm); |
2493 | 0 | strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm); |
2494 | 0 | } |
2495 | | |
2496 | | /* |
2497 | | * Parse a "pattern=interval" clause (e.g. a ChannelTimeout). |
2498 | | * Returns 0 on success or non-zero on failure. |
2499 | | * Caller must free *typep. |
2500 | | */ |
2501 | | int |
2502 | | parse_pattern_interval(const char *s, char **typep, int *secsp) |
2503 | 0 | { |
2504 | 0 | char *cp, *sdup; |
2505 | 0 | int secs; |
2506 | |
|
2507 | 0 | if (typep != NULL) |
2508 | 0 | *typep = NULL; |
2509 | 0 | if (secsp != NULL) |
2510 | 0 | *secsp = 0; |
2511 | 0 | if (s == NULL) |
2512 | 0 | return -1; |
2513 | 0 | sdup = xstrdup(s); |
2514 | |
|
2515 | 0 | if ((cp = strchr(sdup, '=')) == NULL || cp == sdup) { |
2516 | 0 | free(sdup); |
2517 | 0 | return -1; |
2518 | 0 | } |
2519 | 0 | *cp++ = '\0'; |
2520 | 0 | if ((secs = convtime(cp)) < 0) { |
2521 | 0 | free(sdup); |
2522 | 0 | return -1; |
2523 | 0 | } |
2524 | | /* success */ |
2525 | 0 | if (typep != NULL) |
2526 | 0 | *typep = xstrdup(sdup); |
2527 | 0 | if (secsp != NULL) |
2528 | 0 | *secsp = secs; |
2529 | 0 | free(sdup); |
2530 | 0 | return 0; |
2531 | 0 | } |
2532 | | |
2533 | | /* check if path is absolute */ |
2534 | | int |
2535 | | path_absolute(const char *path) |
2536 | 0 | { |
2537 | 0 | return (*path == '/') ? 1 : 0; |
2538 | 0 | } |
2539 | | |
2540 | | void |
2541 | | skip_space(char **cpp) |
2542 | 0 | { |
2543 | 0 | char *cp; |
2544 | |
|
2545 | 0 | for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++) |
2546 | 0 | ; |
2547 | 0 | *cpp = cp; |
2548 | 0 | } |
2549 | | |
2550 | | /* authorized_key-style options parsing helpers */ |
2551 | | |
2552 | | /* |
2553 | | * Match flag 'opt' in *optsp, and if allow_negate is set then also match |
2554 | | * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0 |
2555 | | * if negated option matches. |
2556 | | * If the option or negated option matches, then *optsp is updated to |
2557 | | * point to the first character after the option. |
2558 | | */ |
2559 | | int |
2560 | | opt_flag(const char *opt, int allow_negate, const char **optsp) |
2561 | 801k | { |
2562 | 801k | size_t opt_len = strlen(opt); |
2563 | 801k | const char *opts = *optsp; |
2564 | 801k | int negate = 0; |
2565 | | |
2566 | 801k | if (allow_negate && strncasecmp(opts, "no-", 3) == 0) { |
2567 | 227 | opts += 3; |
2568 | 227 | negate = 1; |
2569 | 227 | } |
2570 | 801k | if (strncasecmp(opts, opt, opt_len) == 0) { |
2571 | 1.97k | *optsp = opts + opt_len; |
2572 | 1.97k | return negate ? 0 : 1; |
2573 | 1.97k | } |
2574 | 799k | return -1; |
2575 | 801k | } |
2576 | | |
2577 | | char * |
2578 | | opt_dequote(const char **sp, const char **errstrp) |
2579 | 87.7k | { |
2580 | 87.7k | const char *s = *sp; |
2581 | 87.7k | char *ret; |
2582 | 87.7k | size_t i; |
2583 | | |
2584 | 87.7k | *errstrp = NULL; |
2585 | 87.7k | if (*s != '"') { |
2586 | 51 | *errstrp = "missing start quote"; |
2587 | 51 | return NULL; |
2588 | 51 | } |
2589 | 87.6k | s++; |
2590 | 87.6k | if ((ret = malloc(strlen((s)) + 1)) == NULL) { |
2591 | 0 | *errstrp = "memory allocation failed"; |
2592 | 0 | return NULL; |
2593 | 0 | } |
2594 | 6.56M | for (i = 0; *s != '\0' && *s != '"';) { |
2595 | 6.47M | if (s[0] == '\\' && s[1] == '"') |
2596 | 388 | s++; |
2597 | 6.47M | ret[i++] = *s++; |
2598 | 6.47M | } |
2599 | 87.6k | if (*s == '\0') { |
2600 | 97 | *errstrp = "missing end quote"; |
2601 | 97 | free(ret); |
2602 | 97 | return NULL; |
2603 | 97 | } |
2604 | 87.5k | ret[i] = '\0'; |
2605 | 87.5k | s++; |
2606 | 87.5k | *sp = s; |
2607 | 87.5k | return ret; |
2608 | 87.6k | } |
2609 | | |
2610 | | int |
2611 | | opt_match(const char **opts, const char *term) |
2612 | 518k | { |
2613 | 518k | if (strncasecmp((*opts), term, strlen(term)) == 0 && |
2614 | 518k | (*opts)[strlen(term)] == '=') { |
2615 | 87.7k | *opts += strlen(term) + 1; |
2616 | 87.7k | return 1; |
2617 | 87.7k | } |
2618 | 430k | return 0; |
2619 | 518k | } |
2620 | | |
2621 | | void |
2622 | | opt_array_append2(const char *file, const int line, const char *directive, |
2623 | | char ***array, int **iarray, u_int *lp, const char *s, int i) |
2624 | 0 | { |
2625 | |
|
2626 | 0 | if (*lp >= INT_MAX) |
2627 | 0 | fatal("%s line %d: Too many %s entries", file, line, directive); |
2628 | | |
2629 | 0 | if (iarray != NULL) { |
2630 | 0 | *iarray = xrecallocarray(*iarray, *lp, *lp + 1, |
2631 | 0 | sizeof(**iarray)); |
2632 | 0 | (*iarray)[*lp] = i; |
2633 | 0 | } |
2634 | |
|
2635 | 0 | *array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array)); |
2636 | 0 | (*array)[*lp] = xstrdup(s); |
2637 | 0 | (*lp)++; |
2638 | 0 | } |
2639 | | |
2640 | | void |
2641 | | opt_array_append(const char *file, const int line, const char *directive, |
2642 | | char ***array, u_int *lp, const char *s) |
2643 | 0 | { |
2644 | 0 | opt_array_append2(file, line, directive, array, NULL, lp, s, 0); |
2645 | 0 | } |
2646 | | |
2647 | | sshsig_t |
2648 | | ssh_signal(int signum, sshsig_t handler) |
2649 | 0 | { |
2650 | 0 | struct sigaction sa, osa; |
2651 | | |
2652 | | /* mask all other signals while in handler */ |
2653 | 0 | memset(&sa, 0, sizeof(sa)); |
2654 | 0 | sa.sa_handler = handler; |
2655 | 0 | sigfillset(&sa.sa_mask); |
2656 | 0 | #if defined(SA_RESTART) && !defined(NO_SA_RESTART) |
2657 | 0 | if (signum != SIGALRM) |
2658 | 0 | sa.sa_flags = SA_RESTART; |
2659 | 0 | #endif |
2660 | 0 | if (sigaction(signum, &sa, &osa) == -1) { |
2661 | 0 | debug3("sigaction(%s): %s", strsignal(signum), strerror(errno)); |
2662 | 0 | return SIG_ERR; |
2663 | 0 | } |
2664 | 0 | return osa.sa_handler; |
2665 | 0 | } |
2666 | | |
2667 | | int |
2668 | | stdfd_devnull(int do_stdin, int do_stdout, int do_stderr) |
2669 | 0 | { |
2670 | 0 | int devnull, ret = 0; |
2671 | |
|
2672 | 0 | if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) { |
2673 | 0 | error_f("open %s: %s", _PATH_DEVNULL, |
2674 | 0 | strerror(errno)); |
2675 | 0 | return -1; |
2676 | 0 | } |
2677 | 0 | if ((do_stdin && dup2(devnull, STDIN_FILENO) == -1) || |
2678 | 0 | (do_stdout && dup2(devnull, STDOUT_FILENO) == -1) || |
2679 | 0 | (do_stderr && dup2(devnull, STDERR_FILENO) == -1)) { |
2680 | 0 | error_f("dup2: %s", strerror(errno)); |
2681 | 0 | ret = -1; |
2682 | 0 | } |
2683 | 0 | if (devnull > STDERR_FILENO) |
2684 | 0 | close(devnull); |
2685 | 0 | return ret; |
2686 | 0 | } |
2687 | | |
2688 | | /* |
2689 | | * Runs command in a subprocess with a minimal environment. |
2690 | | * Returns pid on success, 0 on failure. |
2691 | | * The child stdout and stderr maybe captured, left attached or sent to |
2692 | | * /dev/null depending on the contents of flags. |
2693 | | * "tag" is prepended to log messages. |
2694 | | * NB. "command" is only used for logging; the actual command executed is |
2695 | | * av[0]. |
2696 | | */ |
2697 | | pid_t |
2698 | | subprocess(const char *tag, const char *command, |
2699 | | int ac, char **av, FILE **child, u_int flags, |
2700 | | struct passwd *pw, privdrop_fn *drop_privs, privrestore_fn *restore_privs) |
2701 | 0 | { |
2702 | 0 | FILE *f = NULL; |
2703 | 0 | struct stat st; |
2704 | 0 | int fd, devnull, p[2], i; |
2705 | 0 | pid_t pid; |
2706 | 0 | char *cp, errmsg[512]; |
2707 | 0 | u_int nenv = 0; |
2708 | 0 | char **env = NULL; |
2709 | | |
2710 | | /* If dropping privs, then must specify user and restore function */ |
2711 | 0 | if (drop_privs != NULL && (pw == NULL || restore_privs == NULL)) { |
2712 | 0 | error("%s: inconsistent arguments", tag); /* XXX fatal? */ |
2713 | 0 | return 0; |
2714 | 0 | } |
2715 | 0 | if (pw == NULL && (pw = getpwuid(getuid())) == NULL) { |
2716 | 0 | error("%s: no user for current uid", tag); |
2717 | 0 | return 0; |
2718 | 0 | } |
2719 | 0 | if (child != NULL) |
2720 | 0 | *child = NULL; |
2721 | |
|
2722 | 0 | debug3_f("%s command \"%s\" running as %s (flags 0x%x)", |
2723 | 0 | tag, command, pw->pw_name, flags); |
2724 | | |
2725 | | /* Check consistency */ |
2726 | 0 | if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 && |
2727 | 0 | (flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0) { |
2728 | 0 | error_f("inconsistent flags"); |
2729 | 0 | return 0; |
2730 | 0 | } |
2731 | 0 | if (((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0) != (child == NULL)) { |
2732 | 0 | error_f("inconsistent flags/output"); |
2733 | 0 | return 0; |
2734 | 0 | } |
2735 | | |
2736 | | /* |
2737 | | * If executing an explicit binary, then verify the it exists |
2738 | | * and appears safe-ish to execute |
2739 | | */ |
2740 | 0 | if (!path_absolute(av[0])) { |
2741 | 0 | error("%s path is not absolute", tag); |
2742 | 0 | return 0; |
2743 | 0 | } |
2744 | 0 | if (drop_privs != NULL) |
2745 | 0 | drop_privs(pw); |
2746 | 0 | if (stat(av[0], &st) == -1) { |
2747 | 0 | error("Could not stat %s \"%s\": %s", tag, |
2748 | 0 | av[0], strerror(errno)); |
2749 | 0 | goto restore_return; |
2750 | 0 | } |
2751 | 0 | if ((flags & SSH_SUBPROCESS_UNSAFE_PATH) == 0 && |
2752 | 0 | safe_path(av[0], &st, NULL, 0, errmsg, sizeof(errmsg)) != 0) { |
2753 | 0 | error("Unsafe %s \"%s\": %s", tag, av[0], errmsg); |
2754 | 0 | goto restore_return; |
2755 | 0 | } |
2756 | | /* Prepare to keep the child's stdout if requested */ |
2757 | 0 | if (pipe(p) == -1) { |
2758 | 0 | error("%s: pipe: %s", tag, strerror(errno)); |
2759 | 0 | restore_return: |
2760 | 0 | if (restore_privs != NULL) |
2761 | 0 | restore_privs(); |
2762 | 0 | return 0; |
2763 | 0 | } |
2764 | 0 | if (restore_privs != NULL) |
2765 | 0 | restore_privs(); |
2766 | |
|
2767 | 0 | switch ((pid = fork())) { |
2768 | 0 | case -1: /* error */ |
2769 | 0 | error("%s: fork: %s", tag, strerror(errno)); |
2770 | 0 | close(p[0]); |
2771 | 0 | close(p[1]); |
2772 | 0 | return 0; |
2773 | 0 | case 0: /* child */ |
2774 | | /* Prepare a minimal environment for the child. */ |
2775 | 0 | if ((flags & SSH_SUBPROCESS_PRESERVE_ENV) == 0) { |
2776 | 0 | nenv = 5; |
2777 | 0 | env = xcalloc(sizeof(*env), nenv); |
2778 | 0 | child_set_env(&env, &nenv, "PATH", _PATH_STDPATH); |
2779 | 0 | child_set_env(&env, &nenv, "USER", pw->pw_name); |
2780 | 0 | child_set_env(&env, &nenv, "LOGNAME", pw->pw_name); |
2781 | 0 | child_set_env(&env, &nenv, "HOME", pw->pw_dir); |
2782 | 0 | if ((cp = getenv("LANG")) != NULL) |
2783 | 0 | child_set_env(&env, &nenv, "LANG", cp); |
2784 | 0 | } |
2785 | |
|
2786 | 0 | for (i = 1; i < NSIG; i++) |
2787 | 0 | ssh_signal(i, SIG_DFL); |
2788 | |
|
2789 | 0 | if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) { |
2790 | 0 | error("%s: open %s: %s", tag, _PATH_DEVNULL, |
2791 | 0 | strerror(errno)); |
2792 | 0 | _exit(1); |
2793 | 0 | } |
2794 | 0 | if (dup2(devnull, STDIN_FILENO) == -1) { |
2795 | 0 | error("%s: dup2: %s", tag, strerror(errno)); |
2796 | 0 | _exit(1); |
2797 | 0 | } |
2798 | | |
2799 | | /* Set up stdout as requested; leave stderr in place for now. */ |
2800 | 0 | fd = -1; |
2801 | 0 | if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0) |
2802 | 0 | fd = p[1]; |
2803 | 0 | else if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0) |
2804 | 0 | fd = devnull; |
2805 | 0 | if (fd != -1 && dup2(fd, STDOUT_FILENO) == -1) { |
2806 | 0 | error("%s: dup2: %s", tag, strerror(errno)); |
2807 | 0 | _exit(1); |
2808 | 0 | } |
2809 | 0 | closefrom(STDERR_FILENO + 1); |
2810 | |
|
2811 | 0 | if (geteuid() == 0 && |
2812 | 0 | initgroups(pw->pw_name, pw->pw_gid) == -1) { |
2813 | 0 | error("%s: initgroups(%s, %u): %s", tag, |
2814 | 0 | pw->pw_name, (u_int)pw->pw_gid, strerror(errno)); |
2815 | 0 | _exit(1); |
2816 | 0 | } |
2817 | 0 | if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1) { |
2818 | 0 | error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid, |
2819 | 0 | strerror(errno)); |
2820 | 0 | _exit(1); |
2821 | 0 | } |
2822 | 0 | if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1) { |
2823 | 0 | error("%s: setresuid %u: %s", tag, (u_int)pw->pw_uid, |
2824 | 0 | strerror(errno)); |
2825 | 0 | _exit(1); |
2826 | 0 | } |
2827 | | /* stdin is pointed to /dev/null at this point */ |
2828 | 0 | if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 && |
2829 | 0 | dup2(STDIN_FILENO, STDERR_FILENO) == -1) { |
2830 | 0 | error("%s: dup2: %s", tag, strerror(errno)); |
2831 | 0 | _exit(1); |
2832 | 0 | } |
2833 | 0 | if (env != NULL) |
2834 | 0 | execve(av[0], av, env); |
2835 | 0 | else |
2836 | 0 | execv(av[0], av); |
2837 | 0 | error("%s %s \"%s\": %s", tag, env == NULL ? "execv" : "execve", |
2838 | 0 | command, strerror(errno)); |
2839 | 0 | _exit(127); |
2840 | 0 | default: /* parent */ |
2841 | 0 | break; |
2842 | 0 | } |
2843 | | |
2844 | 0 | close(p[1]); |
2845 | 0 | if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0) |
2846 | 0 | close(p[0]); |
2847 | 0 | else if ((f = fdopen(p[0], "r")) == NULL) { |
2848 | 0 | error("%s: fdopen: %s", tag, strerror(errno)); |
2849 | 0 | close(p[0]); |
2850 | | /* Don't leave zombie child */ |
2851 | 0 | kill(pid, SIGTERM); |
2852 | 0 | while (waitpid(pid, NULL, 0) == -1 && errno == EINTR) |
2853 | 0 | ; |
2854 | 0 | return 0; |
2855 | 0 | } |
2856 | | /* Success */ |
2857 | 0 | debug3_f("%s pid %ld", tag, (long)pid); |
2858 | 0 | if (child != NULL) |
2859 | 0 | *child = f; |
2860 | 0 | return pid; |
2861 | 0 | } |
2862 | | |
2863 | | const char * |
2864 | | lookup_env_in_list(const char *env, char * const *envs, size_t nenvs) |
2865 | 0 | { |
2866 | 0 | size_t i, envlen; |
2867 | |
|
2868 | 0 | envlen = strlen(env); |
2869 | 0 | for (i = 0; i < nenvs; i++) { |
2870 | 0 | if (strncmp(envs[i], env, envlen) == 0 && |
2871 | 0 | envs[i][envlen] == '=') { |
2872 | 0 | return envs[i] + envlen + 1; |
2873 | 0 | } |
2874 | 0 | } |
2875 | 0 | return NULL; |
2876 | 0 | } |
2877 | | |
2878 | | const char * |
2879 | | lookup_setenv_in_list(const char *env, char * const *envs, size_t nenvs) |
2880 | 0 | { |
2881 | 0 | char *name, *cp; |
2882 | 0 | const char *ret; |
2883 | |
|
2884 | 0 | name = xstrdup(env); |
2885 | 0 | if ((cp = strchr(name, '=')) == NULL) { |
2886 | 0 | free(name); |
2887 | 0 | return NULL; /* not env=val */ |
2888 | 0 | } |
2889 | 0 | *cp = '\0'; |
2890 | 0 | ret = lookup_env_in_list(name, envs, nenvs); |
2891 | 0 | free(name); |
2892 | 0 | return ret; |
2893 | 0 | } |
2894 | | |
2895 | | /* |
2896 | | * Helpers for managing poll(2)/ppoll(2) timeouts |
2897 | | * Will remember the earliest deadline and return it for use in poll/ppoll. |
2898 | | */ |
2899 | | |
2900 | | /* Initialise a poll/ppoll timeout with an indefinite deadline */ |
2901 | | void |
2902 | | ptimeout_init(struct timespec *pt) |
2903 | 0 | { |
2904 | | /* |
2905 | | * Deliberately invalid for ppoll(2). |
2906 | | * Will be converted to NULL in ptimeout_get_tspec() later. |
2907 | | */ |
2908 | 0 | pt->tv_sec = -1; |
2909 | 0 | pt->tv_nsec = 0; |
2910 | 0 | } |
2911 | | |
2912 | | /* Specify a poll/ppoll deadline of at most 'sec' seconds */ |
2913 | | void |
2914 | | ptimeout_deadline_sec(struct timespec *pt, long sec) |
2915 | 0 | { |
2916 | 0 | if (pt->tv_sec == -1 || pt->tv_sec >= sec) { |
2917 | 0 | pt->tv_sec = sec; |
2918 | 0 | pt->tv_nsec = 0; |
2919 | 0 | } |
2920 | 0 | } |
2921 | | |
2922 | | /* Specify a poll/ppoll deadline of at most 'p' (timespec) */ |
2923 | | static void |
2924 | | ptimeout_deadline_tsp(struct timespec *pt, struct timespec *p) |
2925 | 0 | { |
2926 | 0 | if (pt->tv_sec == -1 || timespeccmp(pt, p, >=)) |
2927 | 0 | *pt = *p; |
2928 | 0 | } |
2929 | | |
2930 | | /* Specify a poll/ppoll deadline of at most 'ms' milliseconds */ |
2931 | | void |
2932 | | ptimeout_deadline_ms(struct timespec *pt, long ms) |
2933 | 0 | { |
2934 | 0 | struct timespec p; |
2935 | |
|
2936 | 0 | p.tv_sec = ms / 1000; |
2937 | 0 | p.tv_nsec = (ms % 1000) * 1000000; |
2938 | 0 | ptimeout_deadline_tsp(pt, &p); |
2939 | 0 | } |
2940 | | |
2941 | | /* Specify a poll/ppoll deadline at wall clock monotime 'when' (timespec) */ |
2942 | | void |
2943 | | ptimeout_deadline_monotime_tsp(struct timespec *pt, struct timespec *when) |
2944 | 0 | { |
2945 | 0 | struct timespec now, t; |
2946 | |
|
2947 | 0 | monotime_ts(&now); |
2948 | |
|
2949 | 0 | if (timespeccmp(&now, when, >=)) { |
2950 | | /* 'when' is now or in the past. Timeout ASAP */ |
2951 | 0 | pt->tv_sec = 0; |
2952 | 0 | pt->tv_nsec = 0; |
2953 | 0 | } else { |
2954 | 0 | timespecsub(when, &now, &t); |
2955 | 0 | ptimeout_deadline_tsp(pt, &t); |
2956 | 0 | } |
2957 | 0 | } |
2958 | | |
2959 | | /* Specify a poll/ppoll deadline at wall clock monotime 'when' */ |
2960 | | void |
2961 | | ptimeout_deadline_monotime(struct timespec *pt, time_t when) |
2962 | 0 | { |
2963 | 0 | struct timespec t; |
2964 | |
|
2965 | 0 | t.tv_sec = when; |
2966 | 0 | t.tv_nsec = 0; |
2967 | 0 | ptimeout_deadline_monotime_tsp(pt, &t); |
2968 | 0 | } |
2969 | | |
2970 | | /* Get a poll(2) timeout value in milliseconds */ |
2971 | | int |
2972 | | ptimeout_get_ms(struct timespec *pt) |
2973 | 0 | { |
2974 | 0 | if (pt->tv_sec == -1) |
2975 | 0 | return -1; |
2976 | 0 | if (pt->tv_sec >= (INT_MAX - (pt->tv_nsec / 1000000)) / 1000) |
2977 | 0 | return INT_MAX; |
2978 | 0 | return (pt->tv_sec * 1000) + (pt->tv_nsec / 1000000); |
2979 | 0 | } |
2980 | | |
2981 | | /* Get a ppoll(2) timeout value as a timespec pointer */ |
2982 | | struct timespec * |
2983 | | ptimeout_get_tsp(struct timespec *pt) |
2984 | 0 | { |
2985 | 0 | return pt->tv_sec == -1 ? NULL : pt; |
2986 | 0 | } |
2987 | | |
2988 | | /* Returns non-zero if a timeout has been set (i.e. is not indefinite) */ |
2989 | | int |
2990 | | ptimeout_isset(struct timespec *pt) |
2991 | 0 | { |
2992 | 0 | return pt->tv_sec != -1; |
2993 | 0 | } |
2994 | | |
2995 | | /* |
2996 | | * Returns zero if the library at 'path' contains symbol 's', nonzero |
2997 | | * otherwise. |
2998 | | */ |
2999 | | int |
3000 | | lib_contains_symbol(const char *path, const char *s) |
3001 | 0 | { |
3002 | | #ifdef HAVE_NLIST_H |
3003 | | struct nlist nl[2]; |
3004 | | int ret = -1, r; |
3005 | | |
3006 | | memset(nl, 0, sizeof(nl)); |
3007 | | nl[0].n_name = xstrdup(s); |
3008 | | nl[1].n_name = NULL; |
3009 | | if ((r = nlist(path, nl)) == -1) { |
3010 | | error_f("nlist failed for %s", path); |
3011 | | goto out; |
3012 | | } |
3013 | | if (r != 0 || nl[0].n_value == 0 || nl[0].n_type == 0) { |
3014 | | error_f("library %s does not contain symbol %s", path, s); |
3015 | | goto out; |
3016 | | } |
3017 | | /* success */ |
3018 | | ret = 0; |
3019 | | out: |
3020 | | free(nl[0].n_name); |
3021 | | return ret; |
3022 | | #else /* HAVE_NLIST_H */ |
3023 | 0 | int fd, ret = -1; |
3024 | 0 | struct stat st; |
3025 | 0 | void *m = NULL; |
3026 | 0 | size_t sz = 0; |
3027 | |
|
3028 | 0 | memset(&st, 0, sizeof(st)); |
3029 | 0 | if ((fd = open(path, O_RDONLY)) < 0) { |
3030 | 0 | error_f("open %s: %s", path, strerror(errno)); |
3031 | 0 | return -1; |
3032 | 0 | } |
3033 | 0 | if (fstat(fd, &st) != 0) { |
3034 | 0 | error_f("fstat %s: %s", path, strerror(errno)); |
3035 | 0 | goto out; |
3036 | 0 | } |
3037 | 0 | if (!S_ISREG(st.st_mode)) { |
3038 | 0 | error_f("%s is not a regular file", path); |
3039 | 0 | goto out; |
3040 | 0 | } |
3041 | 0 | if (st.st_size < 0 || |
3042 | 0 | (size_t)st.st_size < strlen(s) || |
3043 | 0 | st.st_size >= INT_MAX/2) { |
3044 | 0 | error_f("%s bad size %lld", path, (long long)st.st_size); |
3045 | 0 | goto out; |
3046 | 0 | } |
3047 | 0 | sz = (size_t)st.st_size; |
3048 | 0 | if ((m = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, fd, 0)) == MAP_FAILED || |
3049 | 0 | m == NULL) { |
3050 | 0 | error_f("mmap %s: %s", path, strerror(errno)); |
3051 | 0 | goto out; |
3052 | 0 | } |
3053 | 0 | if (memmem(m, sz, s, strlen(s)) == NULL) { |
3054 | 0 | error_f("%s does not contain expected string %s", path, s); |
3055 | 0 | goto out; |
3056 | 0 | } |
3057 | | /* success */ |
3058 | 0 | ret = 0; |
3059 | 0 | out: |
3060 | 0 | if (m != NULL && m != MAP_FAILED) |
3061 | 0 | munmap(m, sz); |
3062 | 0 | close(fd); |
3063 | 0 | return ret; |
3064 | 0 | #endif /* HAVE_NLIST_H */ |
3065 | 0 | } |