File: | src/usr.bin/ssh/ssh/../misc.c |
Warning: | line 1236, column 7 Value stored to 'i' is never read |
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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 <sys/types.h> |
22 | #include <sys/ioctl.h> |
23 | #include <sys/socket.h> |
24 | #include <sys/stat.h> |
25 | #include <sys/time.h> |
26 | #include <sys/wait.h> |
27 | #include <sys/un.h> |
28 | |
29 | #include <net/if.h> |
30 | #include <netinet/in.h> |
31 | #include <netinet/ip.h> |
32 | #include <netinet/tcp.h> |
33 | #include <arpa/inet.h> |
34 | |
35 | #include <ctype.h> |
36 | #include <errno(*__errno()).h> |
37 | #include <fcntl.h> |
38 | #include <netdb.h> |
39 | #include <paths.h> |
40 | #include <pwd.h> |
41 | #include <libgen.h> |
42 | #include <limits.h> |
43 | #include <nlist.h> |
44 | #include <poll.h> |
45 | #include <signal.h> |
46 | #include <stdarg.h> |
47 | #include <stdio.h> |
48 | #include <stdint.h> |
49 | #include <stdlib.h> |
50 | #include <string.h> |
51 | #include <unistd.h> |
52 | |
53 | #include "xmalloc.h" |
54 | #include "misc.h" |
55 | #include "log.h" |
56 | #include "ssh.h" |
57 | #include "sshbuf.h" |
58 | #include "ssherr.h" |
59 | |
60 | /* remove newline at end of string */ |
61 | char * |
62 | chop(char *s) |
63 | { |
64 | char *t = s; |
65 | while (*t) { |
66 | if (*t == '\n' || *t == '\r') { |
67 | *t = '\0'; |
68 | return s; |
69 | } |
70 | t++; |
71 | } |
72 | return s; |
73 | |
74 | } |
75 | |
76 | /* remove whitespace from end of string */ |
77 | void |
78 | rtrim(char *s) |
79 | { |
80 | size_t i; |
81 | |
82 | if ((i = strlen(s)) == 0) |
83 | return; |
84 | for (i--; i > 0; i--) { |
85 | if (isspace((unsigned char)s[i])) |
86 | s[i] = '\0'; |
87 | } |
88 | } |
89 | |
90 | /* set/unset filedescriptor to non-blocking */ |
91 | int |
92 | set_nonblock(int fd) |
93 | { |
94 | int val; |
95 | |
96 | val = fcntl(fd, F_GETFL3); |
97 | if (val == -1) { |
98 | error("fcntl(%d, F_GETFL): %s", fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 98, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "fcntl(%d, F_GETFL): %s", fd , strerror((*__errno()))); |
99 | return (-1); |
100 | } |
101 | if (val & O_NONBLOCK0x0004) { |
102 | debug3("fd %d is O_NONBLOCK", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 102, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "fd %d is O_NONBLOCK", fd ); |
103 | return (0); |
104 | } |
105 | debug2("fd %d setting O_NONBLOCK", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 105, 0 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "fd %d setting O_NONBLOCK" , fd); |
106 | val |= O_NONBLOCK0x0004; |
107 | if (fcntl(fd, F_SETFL4, val) == -1) { |
108 | debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 109, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "fcntl(%d, F_SETFL, O_NONBLOCK): %s" , fd, strerror((*__errno()))) |
109 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 109, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "fcntl(%d, F_SETFL, O_NONBLOCK): %s" , fd, strerror((*__errno()))); |
110 | return (-1); |
111 | } |
112 | return (0); |
113 | } |
114 | |
115 | int |
116 | unset_nonblock(int fd) |
117 | { |
118 | int val; |
119 | |
120 | val = fcntl(fd, F_GETFL3); |
121 | if (val == -1) { |
122 | error("fcntl(%d, F_GETFL): %s", fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 122, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "fcntl(%d, F_GETFL): %s", fd , strerror((*__errno()))); |
123 | return (-1); |
124 | } |
125 | if (!(val & O_NONBLOCK0x0004)) { |
126 | debug3("fd %d is not O_NONBLOCK", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 126, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "fd %d is not O_NONBLOCK" , fd); |
127 | return (0); |
128 | } |
129 | debug("fd %d clearing O_NONBLOCK", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 129, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "fd %d clearing O_NONBLOCK" , fd); |
130 | val &= ~O_NONBLOCK0x0004; |
131 | if (fcntl(fd, F_SETFL4, val) == -1) { |
132 | debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 133, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "fcntl(%d, F_SETFL, ~O_NONBLOCK): %s" , fd, strerror((*__errno()))) |
133 | fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 133, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "fcntl(%d, F_SETFL, ~O_NONBLOCK): %s" , fd, strerror((*__errno()))); |
134 | return (-1); |
135 | } |
136 | return (0); |
137 | } |
138 | |
139 | const char * |
140 | ssh_gai_strerror(int gaierr) |
141 | { |
142 | if (gaierr == EAI_SYSTEM-11 && errno(*__errno()) != 0) |
143 | return strerror(errno(*__errno())); |
144 | return gai_strerror(gaierr); |
145 | } |
146 | |
147 | /* disable nagle on socket */ |
148 | void |
149 | set_nodelay(int fd) |
150 | { |
151 | int opt; |
152 | socklen_t optlen; |
153 | |
154 | optlen = sizeof opt; |
155 | if (getsockopt(fd, IPPROTO_TCP6, TCP_NODELAY0x01, &opt, &optlen) == -1) { |
156 | debug("getsockopt TCP_NODELAY: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 156, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "getsockopt TCP_NODELAY: %.100s" , strerror((*__errno()))); |
157 | return; |
158 | } |
159 | if (opt == 1) { |
160 | debug2("fd %d is TCP_NODELAY", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 160, 0 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "fd %d is TCP_NODELAY", fd ); |
161 | return; |
162 | } |
163 | opt = 1; |
164 | debug2("fd %d setting TCP_NODELAY", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 164, 0 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "fd %d setting TCP_NODELAY" , fd); |
165 | if (setsockopt(fd, IPPROTO_TCP6, TCP_NODELAY0x01, &opt, sizeof opt) == -1) |
166 | error("setsockopt TCP_NODELAY: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 166, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt TCP_NODELAY: %.100s" , strerror((*__errno()))); |
167 | } |
168 | |
169 | /* Allow local port reuse in TIME_WAIT */ |
170 | int |
171 | set_reuseaddr(int fd) |
172 | { |
173 | int on = 1; |
174 | |
175 | if (setsockopt(fd, SOL_SOCKET0xffff, SO_REUSEADDR0x0004, &on, sizeof(on)) == -1) { |
176 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 176, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt SO_REUSEADDR fd %d: %s" , fd, strerror((*__errno()))); |
177 | return -1; |
178 | } |
179 | return 0; |
180 | } |
181 | |
182 | /* Get/set routing domain */ |
183 | char * |
184 | get_rdomain(int fd) |
185 | { |
186 | int rtable; |
187 | char *ret; |
188 | socklen_t len = sizeof(rtable); |
189 | |
190 | if (getsockopt(fd, SOL_SOCKET0xffff, SO_RTABLE0x1021, &rtable, &len) == -1) { |
191 | error("Failed to get routing domain for fd %d: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 192, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Failed to get routing domain for fd %d: %s" , fd, strerror((*__errno()))) |
192 | fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 192, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Failed to get routing domain for fd %d: %s" , fd, strerror((*__errno()))); |
193 | return NULL((void *)0); |
194 | } |
195 | xasprintf(&ret, "%d", rtable); |
196 | return ret; |
197 | } |
198 | |
199 | int |
200 | set_rdomain(int fd, const char *name) |
201 | { |
202 | int rtable; |
203 | const char *errstr; |
204 | |
205 | if (name == NULL((void *)0)) |
206 | return 0; /* default table */ |
207 | |
208 | rtable = (int)strtonum(name, 0, 255, &errstr); |
209 | if (errstr != NULL((void *)0)) { |
210 | /* Shouldn't happen */ |
211 | error("Invalid routing domain \"%s\": %s", name, errstr)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 211, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Invalid routing domain \"%s\": %s" , name, errstr); |
212 | return -1; |
213 | } |
214 | if (setsockopt(fd, SOL_SOCKET0xffff, SO_RTABLE0x1021, |
215 | &rtable, sizeof(rtable)) == -1) { |
216 | error("Failed to set routing domain %d on fd %d: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 217, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Failed to set routing domain %d on fd %d: %s" , rtable, fd, strerror((*__errno()))) |
217 | rtable, fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 217, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Failed to set routing domain %d on fd %d: %s" , rtable, fd, strerror((*__errno()))); |
218 | return -1; |
219 | } |
220 | return 0; |
221 | } |
222 | |
223 | int |
224 | get_sock_af(int fd) |
225 | { |
226 | struct sockaddr_storage to; |
227 | socklen_t tolen = sizeof(to); |
228 | |
229 | memset(&to, 0, sizeof(to)); |
230 | if (getsockname(fd, (struct sockaddr *)&to, &tolen) == -1) |
231 | return -1; |
232 | return to.ss_family; |
233 | } |
234 | |
235 | void |
236 | set_sock_tos(int fd, int tos) |
237 | { |
238 | int af; |
239 | |
240 | switch ((af = get_sock_af(fd))) { |
241 | case -1: |
242 | /* assume not a socket */ |
243 | break; |
244 | case AF_INET2: |
245 | debug3_f("set socket %d IP_TOS 0x%02x", fd, tos)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 245, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "set socket %d IP_TOS 0x%02x" , fd, tos); |
246 | if (setsockopt(fd, IPPROTO_IP0, IP_TOS3, |
247 | &tos, sizeof(tos)) == -1) { |
248 | error("setsockopt socket %d IP_TOS %d: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 249, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt socket %d IP_TOS %d: %s" , fd, tos, strerror((*__errno()))) |
249 | fd, tos, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 249, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt socket %d IP_TOS %d: %s" , fd, tos, strerror((*__errno()))); |
250 | } |
251 | break; |
252 | case AF_INET624: |
253 | debug3_f("set socket %d IPV6_TCLASS 0x%02x", fd, tos)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 253, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "set socket %d IPV6_TCLASS 0x%02x" , fd, tos); |
254 | if (setsockopt(fd, IPPROTO_IPV641, IPV6_TCLASS61, |
255 | &tos, sizeof(tos)) == -1) { |
256 | error("setsockopt socket %d IPV6_TCLASS %d: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 257, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt socket %d IPV6_TCLASS %d: %s" , fd, tos, strerror((*__errno()))) |
257 | fd, tos, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 257, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt socket %d IPV6_TCLASS %d: %s" , fd, tos, strerror((*__errno()))); |
258 | } |
259 | break; |
260 | default: |
261 | debug2_f("unsupported socket family %d", af)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 261, 1 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "unsupported socket family %d" , af); |
262 | break; |
263 | } |
264 | } |
265 | |
266 | /* |
267 | * Wait up to *timeoutp milliseconds for events on fd. Updates |
268 | * *timeoutp with time remaining. |
269 | * Returns 0 if fd ready or -1 on timeout or error (see errno). |
270 | */ |
271 | static int |
272 | waitfd(int fd, int *timeoutp, short events, volatile sig_atomic_t *stop) |
273 | { |
274 | struct pollfd pfd; |
275 | struct timespec timeout; |
276 | int oerrno, r; |
277 | sigset_t nsigset, osigset; |
278 | |
279 | if (timeoutp && *timeoutp == -1) |
280 | timeoutp = NULL((void *)0); |
281 | pfd.fd = fd; |
282 | pfd.events = events; |
283 | ptimeout_init(&timeout); |
284 | if (timeoutp != NULL((void *)0)) |
285 | ptimeout_deadline_ms(&timeout, *timeoutp); |
286 | if (stop != NULL((void *)0)) |
287 | sigfillset(&nsigset); |
288 | for (; timeoutp == NULL((void *)0) || *timeoutp >= 0;) { |
289 | if (stop != NULL((void *)0)) { |
290 | sigprocmask(SIG_BLOCK1, &nsigset, &osigset); |
291 | if (*stop) { |
292 | sigprocmask(SIG_SETMASK3, &osigset, NULL((void *)0)); |
293 | errno(*__errno()) = EINTR4; |
294 | return -1; |
295 | } |
296 | } |
297 | r = ppoll(&pfd, 1, ptimeout_get_tsp(&timeout), |
298 | stop != NULL((void *)0) ? &osigset : NULL((void *)0)); |
299 | oerrno = errno(*__errno()); |
300 | if (stop != NULL((void *)0)) |
301 | sigprocmask(SIG_SETMASK3, &osigset, NULL((void *)0)); |
302 | if (timeoutp) |
303 | *timeoutp = ptimeout_get_ms(&timeout); |
304 | errno(*__errno()) = oerrno; |
305 | if (r > 0) |
306 | return 0; |
307 | else if (r == -1 && errno(*__errno()) != EAGAIN35 && errno(*__errno()) != EINTR4) |
308 | return -1; |
309 | else if (r == 0) |
310 | break; |
311 | } |
312 | /* timeout */ |
313 | errno(*__errno()) = ETIMEDOUT60; |
314 | return -1; |
315 | } |
316 | |
317 | /* |
318 | * Wait up to *timeoutp milliseconds for fd to be readable. Updates |
319 | * *timeoutp with time remaining. |
320 | * Returns 0 if fd ready or -1 on timeout or error (see errno). |
321 | */ |
322 | int |
323 | waitrfd(int fd, int *timeoutp, volatile sig_atomic_t *stop) { |
324 | return waitfd(fd, timeoutp, POLLIN0x0001, stop); |
325 | } |
326 | |
327 | /* |
328 | * Attempt a non-blocking connect(2) to the specified address, waiting up to |
329 | * *timeoutp milliseconds for the connection to complete. If the timeout is |
330 | * <=0, then wait indefinitely. |
331 | * |
332 | * Returns 0 on success or -1 on failure. |
333 | */ |
334 | int |
335 | timeout_connect(int sockfd, const struct sockaddr *serv_addr, |
336 | socklen_t addrlen, int *timeoutp) |
337 | { |
338 | int optval = 0; |
339 | socklen_t optlen = sizeof(optval); |
340 | |
341 | /* No timeout: just do a blocking connect() */ |
342 | if (timeoutp == NULL((void *)0) || *timeoutp <= 0) |
343 | return connect(sockfd, serv_addr, addrlen); |
344 | |
345 | set_nonblock(sockfd); |
346 | for (;;) { |
347 | if (connect(sockfd, serv_addr, addrlen) == 0) { |
348 | /* Succeeded already? */ |
349 | unset_nonblock(sockfd); |
350 | return 0; |
351 | } else if (errno(*__errno()) == EINTR4) |
352 | continue; |
353 | else if (errno(*__errno()) != EINPROGRESS36) |
354 | return -1; |
355 | break; |
356 | } |
357 | |
358 | if (waitfd(sockfd, timeoutp, POLLIN0x0001 | POLLOUT0x0004, NULL((void *)0)) == -1) |
359 | return -1; |
360 | |
361 | /* Completed or failed */ |
362 | if (getsockopt(sockfd, SOL_SOCKET0xffff, SO_ERROR0x1007, &optval, &optlen) == -1) { |
363 | debug("getsockopt: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 363, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "getsockopt: %s", strerror ((*__errno()))); |
364 | return -1; |
365 | } |
366 | if (optval != 0) { |
367 | errno(*__errno()) = optval; |
368 | return -1; |
369 | } |
370 | unset_nonblock(sockfd); |
371 | return 0; |
372 | } |
373 | |
374 | /* Characters considered whitespace in strsep calls. */ |
375 | #define WHITESPACE" \t\r\n" " \t\r\n" |
376 | #define QUOTE"\"" "\"" |
377 | |
378 | /* return next token in configuration line */ |
379 | static char * |
380 | strdelim_internal(char **s, int split_equals) |
381 | { |
382 | char *old; |
383 | int wspace = 0; |
384 | |
385 | if (*s == NULL((void *)0)) |
386 | return NULL((void *)0); |
387 | |
388 | old = *s; |
389 | |
390 | *s = strpbrk(*s, |
391 | split_equals ? WHITESPACE" \t\r\n" QUOTE"\"" "=" : WHITESPACE" \t\r\n" QUOTE"\""); |
392 | if (*s == NULL((void *)0)) |
393 | return (old); |
394 | |
395 | if (*s[0] == '\"') { |
396 | memmove(*s, *s + 1, strlen(*s)); /* move nul too */ |
397 | /* Find matching quote */ |
398 | if ((*s = strpbrk(*s, QUOTE"\"")) == NULL((void *)0)) { |
399 | return (NULL((void *)0)); /* no matching quote */ |
400 | } else { |
401 | *s[0] = '\0'; |
402 | *s += strspn(*s + 1, WHITESPACE" \t\r\n") + 1; |
403 | return (old); |
404 | } |
405 | } |
406 | |
407 | /* Allow only one '=' to be skipped */ |
408 | if (split_equals && *s[0] == '=') |
409 | wspace = 1; |
410 | *s[0] = '\0'; |
411 | |
412 | /* Skip any extra whitespace after first token */ |
413 | *s += strspn(*s + 1, WHITESPACE" \t\r\n") + 1; |
414 | if (split_equals && *s[0] == '=' && !wspace) |
415 | *s += strspn(*s + 1, WHITESPACE" \t\r\n") + 1; |
416 | |
417 | return (old); |
418 | } |
419 | |
420 | /* |
421 | * Return next token in configuration line; splts on whitespace or a |
422 | * single '=' character. |
423 | */ |
424 | char * |
425 | strdelim(char **s) |
426 | { |
427 | return strdelim_internal(s, 1); |
428 | } |
429 | |
430 | /* |
431 | * Return next token in configuration line; splts on whitespace only. |
432 | */ |
433 | char * |
434 | strdelimw(char **s) |
435 | { |
436 | return strdelim_internal(s, 0); |
437 | } |
438 | |
439 | struct passwd * |
440 | pwcopy(struct passwd *pw) |
441 | { |
442 | struct passwd *copy = xcalloc(1, sizeof(*copy)); |
443 | |
444 | copy->pw_name = xstrdup(pw->pw_name); |
445 | copy->pw_passwd = xstrdup(pw->pw_passwd); |
446 | copy->pw_gecos = xstrdup(pw->pw_gecos); |
447 | copy->pw_uid = pw->pw_uid; |
448 | copy->pw_gid = pw->pw_gid; |
449 | copy->pw_expire = pw->pw_expire; |
450 | copy->pw_change = pw->pw_change; |
451 | copy->pw_class = xstrdup(pw->pw_class); |
452 | copy->pw_dir = xstrdup(pw->pw_dir); |
453 | copy->pw_shell = xstrdup(pw->pw_shell); |
454 | return copy; |
455 | } |
456 | |
457 | /* |
458 | * Convert ASCII string to TCP/IP port number. |
459 | * Port must be >=0 and <=65535. |
460 | * Return -1 if invalid. |
461 | */ |
462 | int |
463 | a2port(const char *s) |
464 | { |
465 | struct servent *se; |
466 | long long port; |
467 | const char *errstr; |
468 | |
469 | port = strtonum(s, 0, 65535, &errstr); |
470 | if (errstr == NULL((void *)0)) |
471 | return (int)port; |
472 | if ((se = getservbyname(s, "tcp")) != NULL((void *)0)) |
473 | return ntohs(se->s_port)(__uint16_t)(__builtin_constant_p(se->s_port) ? (__uint16_t )(((__uint16_t)(se->s_port) & 0xffU) << 8 | ((__uint16_t )(se->s_port) & 0xff00U) >> 8) : __swap16md(se-> s_port)); |
474 | return -1; |
475 | } |
476 | |
477 | int |
478 | a2tun(const char *s, int *remote) |
479 | { |
480 | const char *errstr = NULL((void *)0); |
481 | char *sp, *ep; |
482 | int tun; |
483 | |
484 | if (remote != NULL((void *)0)) { |
485 | *remote = SSH_TUNID_ANY0x7fffffff; |
486 | sp = xstrdup(s); |
487 | if ((ep = strchr(sp, ':')) == NULL((void *)0)) { |
488 | free(sp); |
489 | return (a2tun(s, NULL((void *)0))); |
490 | } |
491 | ep[0] = '\0'; ep++; |
492 | *remote = a2tun(ep, NULL((void *)0)); |
493 | tun = a2tun(sp, NULL((void *)0)); |
494 | free(sp); |
495 | return (*remote == SSH_TUNID_ERR(0x7fffffff - 1) ? *remote : tun); |
496 | } |
497 | |
498 | if (strcasecmp(s, "any") == 0) |
499 | return (SSH_TUNID_ANY0x7fffffff); |
500 | |
501 | tun = strtonum(s, 0, SSH_TUNID_MAX(0x7fffffff - 2), &errstr); |
502 | if (errstr != NULL((void *)0)) |
503 | return (SSH_TUNID_ERR(0x7fffffff - 1)); |
504 | |
505 | return (tun); |
506 | } |
507 | |
508 | #define SECONDS1 1 |
509 | #define MINUTES(1 * 60) (SECONDS1 * 60) |
510 | #define HOURS((1 * 60) * 60) (MINUTES(1 * 60) * 60) |
511 | #define DAYS(((1 * 60) * 60) * 24) (HOURS((1 * 60) * 60) * 24) |
512 | #define WEEKS((((1 * 60) * 60) * 24) * 7) (DAYS(((1 * 60) * 60) * 24) * 7) |
513 | |
514 | /* |
515 | * Convert a time string into seconds; format is |
516 | * a sequence of: |
517 | * time[qualifier] |
518 | * |
519 | * Valid time qualifiers are: |
520 | * <none> seconds |
521 | * s|S seconds |
522 | * m|M minutes |
523 | * h|H hours |
524 | * d|D days |
525 | * w|W weeks |
526 | * |
527 | * Examples: |
528 | * 90m 90 minutes |
529 | * 1h30m 90 minutes |
530 | * 2d 2 days |
531 | * 1w 1 week |
532 | * |
533 | * Return -1 if time string is invalid. |
534 | */ |
535 | int |
536 | convtime(const char *s) |
537 | { |
538 | long total, secs, multiplier; |
539 | const char *p; |
540 | char *endp; |
541 | |
542 | errno(*__errno()) = 0; |
543 | total = 0; |
544 | p = s; |
545 | |
546 | if (p == NULL((void *)0) || *p == '\0') |
547 | return -1; |
548 | |
549 | while (*p) { |
550 | secs = strtol(p, &endp, 10); |
551 | if (p == endp || |
552 | (errno(*__errno()) == ERANGE34 && (secs == INT_MIN(-0x7fffffff-1) || secs == INT_MAX0x7fffffff)) || |
553 | secs < 0) |
554 | return -1; |
555 | |
556 | multiplier = 1; |
557 | switch (*endp++) { |
558 | case '\0': |
559 | endp--; |
560 | break; |
561 | case 's': |
562 | case 'S': |
563 | break; |
564 | case 'm': |
565 | case 'M': |
566 | multiplier = MINUTES(1 * 60); |
567 | break; |
568 | case 'h': |
569 | case 'H': |
570 | multiplier = HOURS((1 * 60) * 60); |
571 | break; |
572 | case 'd': |
573 | case 'D': |
574 | multiplier = DAYS(((1 * 60) * 60) * 24); |
575 | break; |
576 | case 'w': |
577 | case 'W': |
578 | multiplier = WEEKS((((1 * 60) * 60) * 24) * 7); |
579 | break; |
580 | default: |
581 | return -1; |
582 | } |
583 | if (secs > INT_MAX0x7fffffff / multiplier) |
584 | return -1; |
585 | secs *= multiplier; |
586 | if (total > INT_MAX0x7fffffff - secs) |
587 | return -1; |
588 | total += secs; |
589 | if (total < 0) |
590 | return -1; |
591 | p = endp; |
592 | } |
593 | |
594 | return total; |
595 | } |
596 | |
597 | #define TF_BUFS8 8 |
598 | #define TF_LEN9 9 |
599 | |
600 | const char * |
601 | fmt_timeframe(time_t t) |
602 | { |
603 | char *buf; |
604 | static char tfbuf[TF_BUFS8][TF_LEN9]; /* ring buffer */ |
605 | static int idx = 0; |
606 | unsigned int sec, min, hrs, day; |
607 | unsigned long long week; |
608 | |
609 | buf = tfbuf[idx++]; |
610 | if (idx == TF_BUFS8) |
611 | idx = 0; |
612 | |
613 | week = t; |
614 | |
615 | sec = week % 60; |
616 | week /= 60; |
617 | min = week % 60; |
618 | week /= 60; |
619 | hrs = week % 24; |
620 | week /= 24; |
621 | day = week % 7; |
622 | week /= 7; |
623 | |
624 | if (week > 0) |
625 | snprintf(buf, TF_LEN9, "%02lluw%01ud%02uh", week, day, hrs); |
626 | else if (day > 0) |
627 | snprintf(buf, TF_LEN9, "%01ud%02uh%02um", day, hrs, min); |
628 | else |
629 | snprintf(buf, TF_LEN9, "%02u:%02u:%02u", hrs, min, sec); |
630 | |
631 | return (buf); |
632 | } |
633 | |
634 | /* |
635 | * Returns a standardized host+port identifier string. |
636 | * Caller must free returned string. |
637 | */ |
638 | char * |
639 | put_host_port(const char *host, u_short port) |
640 | { |
641 | char *hoststr; |
642 | |
643 | if (port == 0 || port == SSH_DEFAULT_PORT22) |
644 | return(xstrdup(host)); |
645 | if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1) |
646 | fatal("put_host_port: asprintf: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 646, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "put_host_port: asprintf: %s" , strerror((*__errno()))); |
647 | debug3("put_host_port: %s", hoststr)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 647, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "put_host_port: %s", hoststr ); |
648 | return hoststr; |
649 | } |
650 | |
651 | /* |
652 | * Search for next delimiter between hostnames/addresses and ports. |
653 | * Argument may be modified (for termination). |
654 | * Returns *cp if parsing succeeds. |
655 | * *cp is set to the start of the next field, if one was found. |
656 | * The delimiter char, if present, is stored in delim. |
657 | * If this is the last field, *cp is set to NULL. |
658 | */ |
659 | char * |
660 | hpdelim2(char **cp, char *delim) |
661 | { |
662 | char *s, *old; |
663 | |
664 | if (cp == NULL((void *)0) || *cp == NULL((void *)0)) |
665 | return NULL((void *)0); |
666 | |
667 | old = s = *cp; |
668 | if (*s == '[') { |
669 | if ((s = strchr(s, ']')) == NULL((void *)0)) |
670 | return NULL((void *)0); |
671 | else |
672 | s++; |
673 | } else if ((s = strpbrk(s, ":/")) == NULL((void *)0)) |
674 | s = *cp + strlen(*cp); /* skip to end (see first case below) */ |
675 | |
676 | switch (*s) { |
677 | case '\0': |
678 | *cp = NULL((void *)0); /* no more fields*/ |
679 | break; |
680 | |
681 | case ':': |
682 | case '/': |
683 | if (delim != NULL((void *)0)) |
684 | *delim = *s; |
685 | *s = '\0'; /* terminate */ |
686 | *cp = s + 1; |
687 | break; |
688 | |
689 | default: |
690 | return NULL((void *)0); |
691 | } |
692 | |
693 | return old; |
694 | } |
695 | |
696 | /* The common case: only accept colon as delimiter. */ |
697 | char * |
698 | hpdelim(char **cp) |
699 | { |
700 | char *r, delim = '\0'; |
701 | |
702 | r = hpdelim2(cp, &delim); |
703 | if (delim == '/') |
704 | return NULL((void *)0); |
705 | return r; |
706 | } |
707 | |
708 | char * |
709 | cleanhostname(char *host) |
710 | { |
711 | if (*host == '[' && host[strlen(host) - 1] == ']') { |
712 | host[strlen(host) - 1] = '\0'; |
713 | return (host + 1); |
714 | } else |
715 | return host; |
716 | } |
717 | |
718 | char * |
719 | colon(char *cp) |
720 | { |
721 | int flag = 0; |
722 | |
723 | if (*cp == ':') /* Leading colon is part of file name. */ |
724 | return NULL((void *)0); |
725 | if (*cp == '[') |
726 | flag = 1; |
727 | |
728 | for (; *cp; ++cp) { |
729 | if (*cp == '@' && *(cp+1) == '[') |
730 | flag = 1; |
731 | if (*cp == ']' && *(cp+1) == ':' && flag) |
732 | return (cp+1); |
733 | if (*cp == ':' && !flag) |
734 | return (cp); |
735 | if (*cp == '/') |
736 | return NULL((void *)0); |
737 | } |
738 | return NULL((void *)0); |
739 | } |
740 | |
741 | /* |
742 | * Parse a [user@]host:[path] string. |
743 | * Caller must free returned user, host and path. |
744 | * Any of the pointer return arguments may be NULL (useful for syntax checking). |
745 | * If user was not specified then *userp will be set to NULL. |
746 | * If host was not specified then *hostp will be set to NULL. |
747 | * If path was not specified then *pathp will be set to ".". |
748 | * Returns 0 on success, -1 on failure. |
749 | */ |
750 | int |
751 | parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp) |
752 | { |
753 | char *user = NULL((void *)0), *host = NULL((void *)0), *path = NULL((void *)0); |
754 | char *sdup, *tmp; |
755 | int ret = -1; |
756 | |
757 | if (userp != NULL((void *)0)) |
758 | *userp = NULL((void *)0); |
759 | if (hostp != NULL((void *)0)) |
760 | *hostp = NULL((void *)0); |
761 | if (pathp != NULL((void *)0)) |
762 | *pathp = NULL((void *)0); |
763 | |
764 | sdup = xstrdup(s); |
765 | |
766 | /* Check for remote syntax: [user@]host:[path] */ |
767 | if ((tmp = colon(sdup)) == NULL((void *)0)) |
768 | goto out; |
769 | |
770 | /* Extract optional path */ |
771 | *tmp++ = '\0'; |
772 | if (*tmp == '\0') |
773 | tmp = "."; |
774 | path = xstrdup(tmp); |
775 | |
776 | /* Extract optional user and mandatory host */ |
777 | tmp = strrchr(sdup, '@'); |
778 | if (tmp != NULL((void *)0)) { |
779 | *tmp++ = '\0'; |
780 | host = xstrdup(cleanhostname(tmp)); |
781 | if (*sdup != '\0') |
782 | user = xstrdup(sdup); |
783 | } else { |
784 | host = xstrdup(cleanhostname(sdup)); |
785 | user = NULL((void *)0); |
786 | } |
787 | |
788 | /* Success */ |
789 | if (userp != NULL((void *)0)) { |
790 | *userp = user; |
791 | user = NULL((void *)0); |
792 | } |
793 | if (hostp != NULL((void *)0)) { |
794 | *hostp = host; |
795 | host = NULL((void *)0); |
796 | } |
797 | if (pathp != NULL((void *)0)) { |
798 | *pathp = path; |
799 | path = NULL((void *)0); |
800 | } |
801 | ret = 0; |
802 | out: |
803 | free(sdup); |
804 | free(user); |
805 | free(host); |
806 | free(path); |
807 | return ret; |
808 | } |
809 | |
810 | /* |
811 | * Parse a [user@]host[:port] string. |
812 | * Caller must free returned user and host. |
813 | * Any of the pointer return arguments may be NULL (useful for syntax checking). |
814 | * If user was not specified then *userp will be set to NULL. |
815 | * If port was not specified then *portp will be -1. |
816 | * Returns 0 on success, -1 on failure. |
817 | */ |
818 | int |
819 | parse_user_host_port(const char *s, char **userp, char **hostp, int *portp) |
820 | { |
821 | char *sdup, *cp, *tmp; |
822 | char *user = NULL((void *)0), *host = NULL((void *)0); |
823 | int port = -1, ret = -1; |
824 | |
825 | if (userp != NULL((void *)0)) |
826 | *userp = NULL((void *)0); |
827 | if (hostp != NULL((void *)0)) |
828 | *hostp = NULL((void *)0); |
829 | if (portp != NULL((void *)0)) |
830 | *portp = -1; |
831 | |
832 | if ((sdup = tmp = strdup(s)) == NULL((void *)0)) |
833 | return -1; |
834 | /* Extract optional username */ |
835 | if ((cp = strrchr(tmp, '@')) != NULL((void *)0)) { |
836 | *cp = '\0'; |
837 | if (*tmp == '\0') |
838 | goto out; |
839 | if ((user = strdup(tmp)) == NULL((void *)0)) |
840 | goto out; |
841 | tmp = cp + 1; |
842 | } |
843 | /* Extract mandatory hostname */ |
844 | if ((cp = hpdelim(&tmp)) == NULL((void *)0) || *cp == '\0') |
845 | goto out; |
846 | host = xstrdup(cleanhostname(cp)); |
847 | /* Convert and verify optional port */ |
848 | if (tmp != NULL((void *)0) && *tmp != '\0') { |
849 | if ((port = a2port(tmp)) <= 0) |
850 | goto out; |
851 | } |
852 | /* Success */ |
853 | if (userp != NULL((void *)0)) { |
854 | *userp = user; |
855 | user = NULL((void *)0); |
856 | } |
857 | if (hostp != NULL((void *)0)) { |
858 | *hostp = host; |
859 | host = NULL((void *)0); |
860 | } |
861 | if (portp != NULL((void *)0)) |
862 | *portp = port; |
863 | ret = 0; |
864 | out: |
865 | free(sdup); |
866 | free(user); |
867 | free(host); |
868 | return ret; |
869 | } |
870 | |
871 | /* |
872 | * Converts a two-byte hex string to decimal. |
873 | * Returns the decimal value or -1 for invalid input. |
874 | */ |
875 | static int |
876 | hexchar(const char *s) |
877 | { |
878 | unsigned char result[2]; |
879 | int i; |
880 | |
881 | for (i = 0; i < 2; i++) { |
882 | if (s[i] >= '0' && s[i] <= '9') |
883 | result[i] = (unsigned char)(s[i] - '0'); |
884 | else if (s[i] >= 'a' && s[i] <= 'f') |
885 | result[i] = (unsigned char)(s[i] - 'a') + 10; |
886 | else if (s[i] >= 'A' && s[i] <= 'F') |
887 | result[i] = (unsigned char)(s[i] - 'A') + 10; |
888 | else |
889 | return -1; |
890 | } |
891 | return (result[0] << 4) | result[1]; |
892 | } |
893 | |
894 | /* |
895 | * Decode an url-encoded string. |
896 | * Returns a newly allocated string on success or NULL on failure. |
897 | */ |
898 | static char * |
899 | urldecode(const char *src) |
900 | { |
901 | char *ret, *dst; |
902 | int ch; |
903 | size_t srclen; |
904 | |
905 | if ((srclen = strlen(src)) >= SIZE_MAX0xffffffffffffffffUL) |
906 | fatal_f("input too large")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 906, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "input too large"); |
907 | ret = xmalloc(srclen + 1); |
908 | for (dst = ret; *src != '\0'; src++) { |
909 | switch (*src) { |
910 | case '+': |
911 | *dst++ = ' '; |
912 | break; |
913 | case '%': |
914 | if (!isxdigit((unsigned char)src[1]) || |
915 | !isxdigit((unsigned char)src[2]) || |
916 | (ch = hexchar(src + 1)) == -1) { |
917 | free(ret); |
918 | return NULL((void *)0); |
919 | } |
920 | *dst++ = ch; |
921 | src += 2; |
922 | break; |
923 | default: |
924 | *dst++ = *src; |
925 | break; |
926 | } |
927 | } |
928 | *dst = '\0'; |
929 | |
930 | return ret; |
931 | } |
932 | |
933 | /* |
934 | * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI. |
935 | * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04 |
936 | * Either user or path may be url-encoded (but not host or port). |
937 | * Caller must free returned user, host and path. |
938 | * Any of the pointer return arguments may be NULL (useful for syntax checking) |
939 | * but the scheme must always be specified. |
940 | * If user was not specified then *userp will be set to NULL. |
941 | * If port was not specified then *portp will be -1. |
942 | * If path was not specified then *pathp will be set to NULL. |
943 | * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri. |
944 | */ |
945 | int |
946 | parse_uri(const char *scheme, const char *uri, char **userp, char **hostp, |
947 | int *portp, char **pathp) |
948 | { |
949 | char *uridup, *cp, *tmp, ch; |
950 | char *user = NULL((void *)0), *host = NULL((void *)0), *path = NULL((void *)0); |
951 | int port = -1, ret = -1; |
952 | size_t len; |
953 | |
954 | len = strlen(scheme); |
955 | if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0) |
956 | return 1; |
957 | uri += len + 3; |
958 | |
959 | if (userp != NULL((void *)0)) |
960 | *userp = NULL((void *)0); |
961 | if (hostp != NULL((void *)0)) |
962 | *hostp = NULL((void *)0); |
963 | if (portp != NULL((void *)0)) |
964 | *portp = -1; |
965 | if (pathp != NULL((void *)0)) |
966 | *pathp = NULL((void *)0); |
967 | |
968 | uridup = tmp = xstrdup(uri); |
969 | |
970 | /* Extract optional ssh-info (username + connection params) */ |
971 | if ((cp = strchr(tmp, '@')) != NULL((void *)0)) { |
972 | char *delim; |
973 | |
974 | *cp = '\0'; |
975 | /* Extract username and connection params */ |
976 | if ((delim = strchr(tmp, ';')) != NULL((void *)0)) { |
977 | /* Just ignore connection params for now */ |
978 | *delim = '\0'; |
979 | } |
980 | if (*tmp == '\0') { |
981 | /* Empty username */ |
982 | goto out; |
983 | } |
984 | if ((user = urldecode(tmp)) == NULL((void *)0)) |
985 | goto out; |
986 | tmp = cp + 1; |
987 | } |
988 | |
989 | /* Extract mandatory hostname */ |
990 | if ((cp = hpdelim2(&tmp, &ch)) == NULL((void *)0) || *cp == '\0') |
991 | goto out; |
992 | host = xstrdup(cleanhostname(cp)); |
993 | if (!valid_domain(host, 0, NULL((void *)0))) |
994 | goto out; |
995 | |
996 | if (tmp != NULL((void *)0) && *tmp != '\0') { |
997 | if (ch == ':') { |
998 | /* Convert and verify port. */ |
999 | if ((cp = strchr(tmp, '/')) != NULL((void *)0)) |
1000 | *cp = '\0'; |
1001 | if ((port = a2port(tmp)) <= 0) |
1002 | goto out; |
1003 | tmp = cp ? cp + 1 : NULL((void *)0); |
1004 | } |
1005 | if (tmp != NULL((void *)0) && *tmp != '\0') { |
1006 | /* Extract optional path */ |
1007 | if ((path = urldecode(tmp)) == NULL((void *)0)) |
1008 | goto out; |
1009 | } |
1010 | } |
1011 | |
1012 | /* Success */ |
1013 | if (userp != NULL((void *)0)) { |
1014 | *userp = user; |
1015 | user = NULL((void *)0); |
1016 | } |
1017 | if (hostp != NULL((void *)0)) { |
1018 | *hostp = host; |
1019 | host = NULL((void *)0); |
1020 | } |
1021 | if (portp != NULL((void *)0)) |
1022 | *portp = port; |
1023 | if (pathp != NULL((void *)0)) { |
1024 | *pathp = path; |
1025 | path = NULL((void *)0); |
1026 | } |
1027 | ret = 0; |
1028 | out: |
1029 | free(uridup); |
1030 | free(user); |
1031 | free(host); |
1032 | free(path); |
1033 | return ret; |
1034 | } |
1035 | |
1036 | /* function to assist building execv() arguments */ |
1037 | void |
1038 | addargs(arglist *args, char *fmt, ...) |
1039 | { |
1040 | va_list ap; |
1041 | char *cp; |
1042 | u_int nalloc; |
1043 | int r; |
1044 | |
1045 | va_start(ap, fmt)__builtin_va_start((ap), fmt); |
1046 | r = vasprintf(&cp, fmt, ap); |
1047 | va_end(ap)__builtin_va_end((ap)); |
1048 | if (r == -1) |
1049 | fatal_f("argument too long")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1049 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "argument too long"); |
1050 | |
1051 | nalloc = args->nalloc; |
1052 | if (args->list == NULL((void *)0)) { |
1053 | nalloc = 32; |
1054 | args->num = 0; |
1055 | } else if (args->num > (256 * 1024)) |
1056 | fatal_f("too many arguments")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1056 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "too many arguments"); |
1057 | else if (args->num >= args->nalloc) |
1058 | fatal_f("arglist corrupt")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1058 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "arglist corrupt"); |
1059 | else if (args->num+2 >= nalloc) |
1060 | nalloc *= 2; |
1061 | |
1062 | args->list = xrecallocarray(args->list, args->nalloc, |
1063 | nalloc, sizeof(char *)); |
1064 | args->nalloc = nalloc; |
1065 | args->list[args->num++] = cp; |
1066 | args->list[args->num] = NULL((void *)0); |
1067 | } |
1068 | |
1069 | void |
1070 | replacearg(arglist *args, u_int which, char *fmt, ...) |
1071 | { |
1072 | va_list ap; |
1073 | char *cp; |
1074 | int r; |
1075 | |
1076 | va_start(ap, fmt)__builtin_va_start((ap), fmt); |
1077 | r = vasprintf(&cp, fmt, ap); |
1078 | va_end(ap)__builtin_va_end((ap)); |
1079 | if (r == -1) |
1080 | fatal_f("argument too long")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1080 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "argument too long"); |
1081 | if (args->list == NULL((void *)0) || args->num >= args->nalloc) |
1082 | fatal_f("arglist corrupt")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1082 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "arglist corrupt"); |
1083 | |
1084 | if (which >= args->num) |
1085 | fatal_f("tried to replace invalid arg %d >= %d",sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1086 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "tried to replace invalid arg %d >= %d" , which, args->num) |
1086 | which, args->num)sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1086 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "tried to replace invalid arg %d >= %d" , which, args->num); |
1087 | free(args->list[which]); |
1088 | args->list[which] = cp; |
1089 | } |
1090 | |
1091 | void |
1092 | freeargs(arglist *args) |
1093 | { |
1094 | u_int i; |
1095 | |
1096 | if (args == NULL((void *)0)) |
1097 | return; |
1098 | if (args->list != NULL((void *)0) && args->num < args->nalloc) { |
1099 | for (i = 0; i < args->num; i++) |
1100 | free(args->list[i]); |
1101 | free(args->list); |
1102 | } |
1103 | args->nalloc = args->num = 0; |
1104 | args->list = NULL((void *)0); |
1105 | } |
1106 | |
1107 | /* |
1108 | * Expands tildes in the file name. Returns data allocated by xmalloc. |
1109 | * Warning: this calls getpw*. |
1110 | */ |
1111 | int |
1112 | tilde_expand(const char *filename, uid_t uid, char **retp) |
1113 | { |
1114 | char *ocopy = NULL((void *)0), *copy, *s = NULL((void *)0); |
1115 | const char *path = NULL((void *)0), *user = NULL((void *)0); |
1116 | struct passwd *pw; |
1117 | size_t len; |
1118 | int ret = -1, r, slash; |
1119 | |
1120 | *retp = NULL((void *)0); |
1121 | if (*filename != '~') { |
1122 | *retp = xstrdup(filename); |
1123 | return 0; |
1124 | } |
1125 | ocopy = copy = xstrdup(filename + 1); |
1126 | |
1127 | if (*copy == '\0') /* ~ */ |
1128 | path = NULL((void *)0); |
1129 | else if (*copy == '/') { |
1130 | copy += strspn(copy, "/"); |
1131 | if (*copy == '\0') |
1132 | path = NULL((void *)0); /* ~/ */ |
1133 | else |
1134 | path = copy; /* ~/path */ |
1135 | } else { |
1136 | user = copy; |
1137 | if ((path = strchr(copy, '/')) != NULL((void *)0)) { |
1138 | copy[path - copy] = '\0'; |
1139 | path++; |
1140 | path += strspn(path, "/"); |
1141 | if (*path == '\0') /* ~user/ */ |
1142 | path = NULL((void *)0); |
1143 | /* else ~user/path */ |
1144 | } |
1145 | /* else ~user */ |
1146 | } |
1147 | if (user != NULL((void *)0)) { |
1148 | if ((pw = getpwnam(user)) == NULL((void *)0)) { |
1149 | error_f("No such user %s", user)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1149, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "No such user %s", user); |
1150 | goto out; |
1151 | } |
1152 | } else if ((pw = getpwuid(uid)) == NULL((void *)0)) { |
1153 | error_f("No such uid %ld", (long)uid)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1153, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "No such uid %ld", (long)uid ); |
1154 | goto out; |
1155 | } |
1156 | |
1157 | /* Make sure directory has a trailing '/' */ |
1158 | slash = (len = strlen(pw->pw_dir)) == 0 || pw->pw_dir[len - 1] != '/'; |
1159 | |
1160 | if ((r = xasprintf(&s, "%s%s%s", pw->pw_dir, |
1161 | slash ? "/" : "", path != NULL((void *)0) ? path : "")) <= 0) { |
1162 | error_f("xasprintf failed")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1162, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "xasprintf failed"); |
1163 | goto out; |
1164 | } |
1165 | if (r >= PATH_MAX1024) { |
1166 | error_f("Path too long")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1166, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "Path too long"); |
1167 | goto out; |
1168 | } |
1169 | /* success */ |
1170 | ret = 0; |
1171 | *retp = s; |
1172 | s = NULL((void *)0); |
1173 | out: |
1174 | free(s); |
1175 | free(ocopy); |
1176 | return ret; |
1177 | } |
1178 | |
1179 | char * |
1180 | tilde_expand_filename(const char *filename, uid_t uid) |
1181 | { |
1182 | char *ret; |
1183 | |
1184 | if (tilde_expand(filename, uid, &ret) != 0) |
1185 | cleanup_exit(255); |
1186 | return ret; |
1187 | } |
1188 | |
1189 | /* |
1190 | * Expand a string with a set of %[char] escapes and/or ${ENVIRONMENT} |
1191 | * substitutions. A number of escapes may be specified as |
1192 | * (char *escape_chars, char *replacement) pairs. The list must be terminated |
1193 | * by a NULL escape_char. Returns replaced string in memory allocated by |
1194 | * xmalloc which the caller must free. |
1195 | */ |
1196 | static char * |
1197 | vdollar_percent_expand(int *parseerror, int dollar, int percent, |
1198 | const char *string, va_list ap) |
1199 | { |
1200 | #define EXPAND_MAX_KEYS 64 |
1201 | u_int num_keys = 0, i; |
1202 | struct { |
1203 | const char *key; |
1204 | const char *repl; |
1205 | } keys[EXPAND_MAX_KEYS]; |
1206 | struct sshbuf *buf; |
1207 | int r, missingvar = 0; |
1208 | char *ret = NULL((void *)0), *var, *varend, *val; |
1209 | size_t len; |
1210 | |
1211 | if ((buf = sshbuf_new()) == NULL((void *)0)) |
1212 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1212 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed"); |
1213 | if (parseerror == NULL((void *)0)) |
1214 | fatal_f("null parseerror arg")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1214 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "null parseerror arg"); |
1215 | *parseerror = 1; |
1216 | |
1217 | /* Gather keys if we're doing percent expansion. */ |
1218 | if (percent) { |
1219 | for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { |
1220 | keys[num_keys].key = va_arg(ap, char *)__builtin_va_arg((ap), char *); |
1221 | if (keys[num_keys].key == NULL((void *)0)) |
1222 | break; |
1223 | keys[num_keys].repl = va_arg(ap, char *)__builtin_va_arg((ap), char *); |
1224 | if (keys[num_keys].repl == NULL((void *)0)) { |
1225 | fatal_f("NULL replacement for token %s",sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1226 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "NULL replacement for token %s" , keys[num_keys].key) |
1226 | keys[num_keys].key)sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1226 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "NULL replacement for token %s" , keys[num_keys].key); |
1227 | } |
1228 | } |
1229 | if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *)__builtin_va_arg((ap), char *) != NULL((void *)0)) |
1230 | fatal_f("too many keys")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1230 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "too many keys"); |
1231 | if (num_keys == 0) |
1232 | fatal_f("percent expansion without token list")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1232 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "percent expansion without token list" ); |
1233 | } |
1234 | |
1235 | /* Expand string */ |
1236 | for (i = 0; *string != '\0'; string++) { |
Value stored to 'i' is never read | |
1237 | /* Optionally process ${ENVIRONMENT} expansions. */ |
1238 | if (dollar && string[0] == '$' && string[1] == '{') { |
1239 | string += 2; /* skip over '${' */ |
1240 | if ((varend = strchr(string, '}')) == NULL((void *)0)) { |
1241 | error_f("environment variable '%s' missing "sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1242, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "environment variable '%s' missing " "closing '}'", string) |
1242 | "closing '}'", string)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1242, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "environment variable '%s' missing " "closing '}'", string); |
1243 | goto out; |
1244 | } |
1245 | len = varend - string; |
1246 | if (len == 0) { |
1247 | error_f("zero-length environment variable")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1247, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "zero-length environment variable" ); |
1248 | goto out; |
1249 | } |
1250 | var = xmalloc(len + 1); |
1251 | (void)strlcpy(var, string, len + 1); |
1252 | if ((val = getenv(var)) == NULL((void *)0)) { |
1253 | error_f("env var ${%s} has no value", var)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1253, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "env var ${%s} has no value" , var); |
1254 | missingvar = 1; |
1255 | } else { |
1256 | debug3_f("expand ${%s} -> '%s'", var, val)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1256, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "expand ${%s} -> '%s'" , var, val); |
1257 | if ((r = sshbuf_put(buf, val, strlen(val))) !=0) |
1258 | fatal_fr(r, "sshbuf_put ${}")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1258 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put ${}"); |
1259 | } |
1260 | free(var); |
1261 | string += len; |
1262 | continue; |
1263 | } |
1264 | |
1265 | /* |
1266 | * Process percent expansions if we have a list of TOKENs. |
1267 | * If we're not doing percent expansion everything just gets |
1268 | * appended here. |
1269 | */ |
1270 | if (*string != '%' || !percent) { |
1271 | append: |
1272 | if ((r = sshbuf_put_u8(buf, *string)) != 0) |
1273 | fatal_fr(r, "sshbuf_put_u8 %%")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1273 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put_u8 %%"); |
1274 | continue; |
1275 | } |
1276 | string++; |
1277 | /* %% case */ |
1278 | if (*string == '%') |
1279 | goto append; |
1280 | if (*string == '\0') { |
1281 | error_f("invalid format")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1281, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "invalid format"); |
1282 | goto out; |
1283 | } |
1284 | for (i = 0; i < num_keys; i++) { |
1285 | if (strchr(keys[i].key, *string) != NULL((void *)0)) { |
1286 | if ((r = sshbuf_put(buf, keys[i].repl, |
1287 | strlen(keys[i].repl))) != 0) |
1288 | fatal_fr(r, "sshbuf_put %%-repl")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1288 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put %%-repl"); |
1289 | break; |
1290 | } |
1291 | } |
1292 | if (i >= num_keys) { |
1293 | error_f("unknown key %%%c", *string)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1293, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "unknown key %%%c", *string ); |
1294 | goto out; |
1295 | } |
1296 | } |
1297 | if (!missingvar && (ret = sshbuf_dup_string(buf)) == NULL((void *)0)) |
1298 | fatal_f("sshbuf_dup_string failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1298 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_dup_string failed" ); |
1299 | *parseerror = 0; |
1300 | out: |
1301 | sshbuf_free(buf); |
1302 | return *parseerror ? NULL((void *)0) : ret; |
1303 | #undef EXPAND_MAX_KEYS |
1304 | } |
1305 | |
1306 | /* |
1307 | * Expand only environment variables. |
1308 | * Note that although this function is variadic like the other similar |
1309 | * functions, any such arguments will be unused. |
1310 | */ |
1311 | |
1312 | char * |
1313 | dollar_expand(int *parseerr, const char *string, ...) |
1314 | { |
1315 | char *ret; |
1316 | int err; |
1317 | va_list ap; |
1318 | |
1319 | va_start(ap, string)__builtin_va_start((ap), string); |
1320 | ret = vdollar_percent_expand(&err, 1, 0, string, ap); |
1321 | va_end(ap)__builtin_va_end((ap)); |
1322 | if (parseerr != NULL((void *)0)) |
1323 | *parseerr = err; |
1324 | return ret; |
1325 | } |
1326 | |
1327 | /* |
1328 | * Returns expanded string or NULL if a specified environment variable is |
1329 | * not defined, or calls fatal if the string is invalid. |
1330 | */ |
1331 | char * |
1332 | percent_expand(const char *string, ...) |
1333 | { |
1334 | char *ret; |
1335 | int err; |
1336 | va_list ap; |
1337 | |
1338 | va_start(ap, string)__builtin_va_start((ap), string); |
1339 | ret = vdollar_percent_expand(&err, 0, 1, string, ap); |
1340 | va_end(ap)__builtin_va_end((ap)); |
1341 | if (err) |
1342 | fatal_f("failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1342 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "failed"); |
1343 | return ret; |
1344 | } |
1345 | |
1346 | /* |
1347 | * Returns expanded string or NULL if a specified environment variable is |
1348 | * not defined, or calls fatal if the string is invalid. |
1349 | */ |
1350 | char * |
1351 | percent_dollar_expand(const char *string, ...) |
1352 | { |
1353 | char *ret; |
1354 | int err; |
1355 | va_list ap; |
1356 | |
1357 | va_start(ap, string)__builtin_va_start((ap), string); |
1358 | ret = vdollar_percent_expand(&err, 1, 1, string, ap); |
1359 | va_end(ap)__builtin_va_end((ap)); |
1360 | if (err) |
1361 | fatal_f("failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1361 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "failed"); |
1362 | return ret; |
1363 | } |
1364 | |
1365 | int |
1366 | tun_open(int tun, int mode, char **ifname) |
1367 | { |
1368 | struct ifreq ifr; |
1369 | char name[100]; |
1370 | int fd = -1, sock; |
1371 | const char *tunbase = "tun"; |
1372 | |
1373 | if (ifname != NULL((void *)0)) |
1374 | *ifname = NULL((void *)0); |
1375 | |
1376 | if (mode == SSH_TUNMODE_ETHERNET0x02) |
1377 | tunbase = "tap"; |
1378 | |
1379 | /* Open the tunnel device */ |
1380 | if (tun <= SSH_TUNID_MAX(0x7fffffff - 2)) { |
1381 | snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); |
1382 | fd = open(name, O_RDWR0x0002); |
1383 | } else if (tun == SSH_TUNID_ANY0x7fffffff) { |
1384 | for (tun = 100; tun >= 0; tun--) { |
1385 | snprintf(name, sizeof(name), "/dev/%s%d", |
1386 | tunbase, tun); |
1387 | if ((fd = open(name, O_RDWR0x0002)) >= 0) |
1388 | break; |
1389 | } |
1390 | } else { |
1391 | debug_f("invalid tunnel %u", tun)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1391, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "invalid tunnel %u", tun); |
1392 | return -1; |
1393 | } |
1394 | |
1395 | if (fd == -1) { |
1396 | debug_f("%s open: %s", name, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1396, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s open: %s", name, strerror ((*__errno()))); |
1397 | return -1; |
1398 | } |
1399 | |
1400 | debug_f("%s mode %d fd %d", name, mode, fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1400, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s mode %d fd %d", name, mode, fd); |
1401 | |
1402 | /* Bring interface up if it is not already */ |
1403 | snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); |
1404 | if ((sock = socket(PF_UNIX1, SOCK_STREAM1, 0)) == -1) |
1405 | goto failed; |
1406 | |
1407 | if (ioctl(sock, SIOCGIFFLAGS(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct ifreq) & 0x1fff) << 16) | ((('i')) << 8) | ((17))), &ifr) == -1) { |
1408 | debug_f("get interface %s flags: %s", ifr.ifr_name,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1409, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "get interface %s flags: %s" , ifr.ifr_name, strerror((*__errno()))) |
1409 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1409, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "get interface %s flags: %s" , ifr.ifr_name, strerror((*__errno()))); |
1410 | goto failed; |
1411 | } |
1412 | |
1413 | if (!(ifr.ifr_flagsifr_ifru.ifru_flags & IFF_UP0x1)) { |
1414 | ifr.ifr_flagsifr_ifru.ifru_flags |= IFF_UP0x1; |
1415 | if (ioctl(sock, SIOCSIFFLAGS((unsigned long)0x80000000 | ((sizeof(struct ifreq) & 0x1fff ) << 16) | ((('i')) << 8) | ((16))), &ifr) == -1) { |
1416 | debug_f("activate interface %s: %s", ifr.ifr_name,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1417, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "activate interface %s: %s" , ifr.ifr_name, strerror((*__errno()))) |
1417 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1417, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "activate interface %s: %s" , ifr.ifr_name, strerror((*__errno()))); |
1418 | goto failed; |
1419 | } |
1420 | } |
1421 | |
1422 | if (ifname != NULL((void *)0)) |
1423 | *ifname = xstrdup(ifr.ifr_name); |
1424 | |
1425 | close(sock); |
1426 | return fd; |
1427 | |
1428 | failed: |
1429 | if (fd >= 0) |
1430 | close(fd); |
1431 | if (sock >= 0) |
1432 | close(sock); |
1433 | return -1; |
1434 | } |
1435 | |
1436 | void |
1437 | sanitise_stdfd(void) |
1438 | { |
1439 | int nullfd, dupfd; |
1440 | |
1441 | if ((nullfd = dupfd = open(_PATH_DEVNULL"/dev/null", O_RDWR0x0002)) == -1) { |
1442 | fprintf(stderr(&__sF[2]), "Couldn't open /dev/null: %s\n", |
1443 | strerror(errno(*__errno()))); |
1444 | exit(1); |
1445 | } |
1446 | while (++dupfd <= STDERR_FILENO2) { |
1447 | /* Only populate closed fds. */ |
1448 | if (fcntl(dupfd, F_GETFL3) == -1 && errno(*__errno()) == EBADF9) { |
1449 | if (dup2(nullfd, dupfd) == -1) { |
1450 | fprintf(stderr(&__sF[2]), "dup2: %s\n", strerror(errno(*__errno()))); |
1451 | exit(1); |
1452 | } |
1453 | } |
1454 | } |
1455 | if (nullfd > STDERR_FILENO2) |
1456 | close(nullfd); |
1457 | } |
1458 | |
1459 | char * |
1460 | tohex(const void *vp, size_t l) |
1461 | { |
1462 | const u_char *p = (const u_char *)vp; |
1463 | char b[3], *r; |
1464 | size_t i, hl; |
1465 | |
1466 | if (l > 65536) |
1467 | return xstrdup("tohex: length > 65536"); |
1468 | |
1469 | hl = l * 2 + 1; |
1470 | r = xcalloc(1, hl); |
1471 | for (i = 0; i < l; i++) { |
1472 | snprintf(b, sizeof(b), "%02x", p[i]); |
1473 | strlcat(r, b, hl); |
1474 | } |
1475 | return (r); |
1476 | } |
1477 | |
1478 | /* |
1479 | * Extend string *sp by the specified format. If *sp is not NULL (or empty), |
1480 | * then the separator 'sep' will be prepended before the formatted arguments. |
1481 | * Extended strings are heap allocated. |
1482 | */ |
1483 | void |
1484 | xextendf(char **sp, const char *sep, const char *fmt, ...) |
1485 | { |
1486 | va_list ap; |
1487 | char *tmp1, *tmp2; |
1488 | |
1489 | va_start(ap, fmt)__builtin_va_start((ap), fmt); |
1490 | xvasprintf(&tmp1, fmt, ap); |
1491 | va_end(ap)__builtin_va_end((ap)); |
1492 | |
1493 | if (*sp == NULL((void *)0) || **sp == '\0') { |
1494 | free(*sp); |
1495 | *sp = tmp1; |
1496 | return; |
1497 | } |
1498 | xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL((void *)0) ? "" : sep, tmp1); |
1499 | free(tmp1); |
1500 | free(*sp); |
1501 | *sp = tmp2; |
1502 | } |
1503 | |
1504 | |
1505 | u_int64_t |
1506 | get_u64(const void *vp) |
1507 | { |
1508 | const u_char *p = (const u_char *)vp; |
1509 | u_int64_t v; |
1510 | |
1511 | v = (u_int64_t)p[0] << 56; |
1512 | v |= (u_int64_t)p[1] << 48; |
1513 | v |= (u_int64_t)p[2] << 40; |
1514 | v |= (u_int64_t)p[3] << 32; |
1515 | v |= (u_int64_t)p[4] << 24; |
1516 | v |= (u_int64_t)p[5] << 16; |
1517 | v |= (u_int64_t)p[6] << 8; |
1518 | v |= (u_int64_t)p[7]; |
1519 | |
1520 | return (v); |
1521 | } |
1522 | |
1523 | u_int32_t |
1524 | get_u32(const void *vp) |
1525 | { |
1526 | const u_char *p = (const u_char *)vp; |
1527 | u_int32_t v; |
1528 | |
1529 | v = (u_int32_t)p[0] << 24; |
1530 | v |= (u_int32_t)p[1] << 16; |
1531 | v |= (u_int32_t)p[2] << 8; |
1532 | v |= (u_int32_t)p[3]; |
1533 | |
1534 | return (v); |
1535 | } |
1536 | |
1537 | u_int32_t |
1538 | get_u32_le(const void *vp) |
1539 | { |
1540 | const u_char *p = (const u_char *)vp; |
1541 | u_int32_t v; |
1542 | |
1543 | v = (u_int32_t)p[0]; |
1544 | v |= (u_int32_t)p[1] << 8; |
1545 | v |= (u_int32_t)p[2] << 16; |
1546 | v |= (u_int32_t)p[3] << 24; |
1547 | |
1548 | return (v); |
1549 | } |
1550 | |
1551 | u_int16_t |
1552 | get_u16(const void *vp) |
1553 | { |
1554 | const u_char *p = (const u_char *)vp; |
1555 | u_int16_t v; |
1556 | |
1557 | v = (u_int16_t)p[0] << 8; |
1558 | v |= (u_int16_t)p[1]; |
1559 | |
1560 | return (v); |
1561 | } |
1562 | |
1563 | void |
1564 | put_u64(void *vp, u_int64_t v) |
1565 | { |
1566 | u_char *p = (u_char *)vp; |
1567 | |
1568 | p[0] = (u_char)(v >> 56) & 0xff; |
1569 | p[1] = (u_char)(v >> 48) & 0xff; |
1570 | p[2] = (u_char)(v >> 40) & 0xff; |
1571 | p[3] = (u_char)(v >> 32) & 0xff; |
1572 | p[4] = (u_char)(v >> 24) & 0xff; |
1573 | p[5] = (u_char)(v >> 16) & 0xff; |
1574 | p[6] = (u_char)(v >> 8) & 0xff; |
1575 | p[7] = (u_char)v & 0xff; |
1576 | } |
1577 | |
1578 | void |
1579 | put_u32(void *vp, u_int32_t v) |
1580 | { |
1581 | u_char *p = (u_char *)vp; |
1582 | |
1583 | p[0] = (u_char)(v >> 24) & 0xff; |
1584 | p[1] = (u_char)(v >> 16) & 0xff; |
1585 | p[2] = (u_char)(v >> 8) & 0xff; |
1586 | p[3] = (u_char)v & 0xff; |
1587 | } |
1588 | |
1589 | void |
1590 | put_u32_le(void *vp, u_int32_t v) |
1591 | { |
1592 | u_char *p = (u_char *)vp; |
1593 | |
1594 | p[0] = (u_char)v & 0xff; |
1595 | p[1] = (u_char)(v >> 8) & 0xff; |
1596 | p[2] = (u_char)(v >> 16) & 0xff; |
1597 | p[3] = (u_char)(v >> 24) & 0xff; |
1598 | } |
1599 | |
1600 | void |
1601 | put_u16(void *vp, u_int16_t v) |
1602 | { |
1603 | u_char *p = (u_char *)vp; |
1604 | |
1605 | p[0] = (u_char)(v >> 8) & 0xff; |
1606 | p[1] = (u_char)v & 0xff; |
1607 | } |
1608 | |
1609 | void |
1610 | ms_subtract_diff(struct timeval *start, int *ms) |
1611 | { |
1612 | struct timeval diff, finish; |
1613 | |
1614 | monotime_tv(&finish); |
1615 | timersub(&finish, start, &diff)do { (&diff)->tv_sec = (&finish)->tv_sec - (start )->tv_sec; (&diff)->tv_usec = (&finish)->tv_usec - (start)->tv_usec; if ((&diff)->tv_usec < 0) { (&diff)->tv_sec--; (&diff)->tv_usec += 1000000 ; } } while (0); |
1616 | *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); |
1617 | } |
1618 | |
1619 | void |
1620 | ms_to_timespec(struct timespec *ts, int ms) |
1621 | { |
1622 | if (ms < 0) |
1623 | ms = 0; |
1624 | ts->tv_sec = ms / 1000; |
1625 | ts->tv_nsec = (ms % 1000) * 1000 * 1000; |
1626 | } |
1627 | |
1628 | void |
1629 | monotime_ts(struct timespec *ts) |
1630 | { |
1631 | if (clock_gettime(CLOCK_MONOTONIC3, ts) != 0) |
1632 | fatal("clock_gettime: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1632 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "clock_gettime: %s", strerror ((*__errno()))); |
1633 | } |
1634 | |
1635 | void |
1636 | monotime_tv(struct timeval *tv) |
1637 | { |
1638 | struct timespec ts; |
1639 | |
1640 | monotime_ts(&ts); |
1641 | tv->tv_sec = ts.tv_sec; |
1642 | tv->tv_usec = ts.tv_nsec / 1000; |
1643 | } |
1644 | |
1645 | time_t |
1646 | monotime(void) |
1647 | { |
1648 | struct timespec ts; |
1649 | |
1650 | monotime_ts(&ts); |
1651 | return (ts.tv_sec); |
1652 | } |
1653 | |
1654 | double |
1655 | monotime_double(void) |
1656 | { |
1657 | struct timespec ts; |
1658 | |
1659 | monotime_ts(&ts); |
1660 | return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0; |
1661 | } |
1662 | |
1663 | void |
1664 | bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) |
1665 | { |
1666 | bw->buflen = buflen; |
1667 | bw->rate = kbps; |
1668 | bw->thresh = buflen; |
1669 | bw->lamt = 0; |
1670 | timerclear(&bw->bwstart)(&bw->bwstart)->tv_sec = (&bw->bwstart)-> tv_usec = 0; |
1671 | timerclear(&bw->bwend)(&bw->bwend)->tv_sec = (&bw->bwend)->tv_usec = 0; |
1672 | } |
1673 | |
1674 | /* Callback from read/write loop to insert bandwidth-limiting delays */ |
1675 | void |
1676 | bandwidth_limit(struct bwlimit *bw, size_t read_len) |
1677 | { |
1678 | u_int64_t waitlen; |
1679 | struct timespec ts, rm; |
1680 | |
1681 | bw->lamt += read_len; |
1682 | if (!timerisset(&bw->bwstart)((&bw->bwstart)->tv_sec || (&bw->bwstart)-> tv_usec)) { |
1683 | monotime_tv(&bw->bwstart); |
1684 | return; |
1685 | } |
1686 | if (bw->lamt < bw->thresh) |
1687 | return; |
1688 | |
1689 | monotime_tv(&bw->bwend); |
1690 | timersub(&bw->bwend, &bw->bwstart, &bw->bwend)do { (&bw->bwend)->tv_sec = (&bw->bwend)-> tv_sec - (&bw->bwstart)->tv_sec; (&bw->bwend )->tv_usec = (&bw->bwend)->tv_usec - (&bw-> bwstart)->tv_usec; if ((&bw->bwend)->tv_usec < 0) { (&bw->bwend)->tv_sec--; (&bw->bwend)-> tv_usec += 1000000; } } while (0); |
1691 | if (!timerisset(&bw->bwend)((&bw->bwend)->tv_sec || (&bw->bwend)->tv_usec )) |
1692 | return; |
1693 | |
1694 | bw->lamt *= 8; |
1695 | waitlen = (double)1000000L * bw->lamt / bw->rate; |
1696 | |
1697 | bw->bwstart.tv_sec = waitlen / 1000000L; |
1698 | bw->bwstart.tv_usec = waitlen % 1000000L; |
1699 | |
1700 | if (timercmp(&bw->bwstart, &bw->bwend, >)(((&bw->bwstart)->tv_sec == (&bw->bwend)-> tv_sec) ? ((&bw->bwstart)->tv_usec > (&bw-> bwend)->tv_usec) : ((&bw->bwstart)->tv_sec > ( &bw->bwend)->tv_sec))) { |
1701 | timersub(&bw->bwstart, &bw->bwend, &bw->bwend)do { (&bw->bwend)->tv_sec = (&bw->bwstart)-> tv_sec - (&bw->bwend)->tv_sec; (&bw->bwend)-> tv_usec = (&bw->bwstart)->tv_usec - (&bw->bwend )->tv_usec; if ((&bw->bwend)->tv_usec < 0) { ( &bw->bwend)->tv_sec--; (&bw->bwend)->tv_usec += 1000000; } } while (0); |
1702 | |
1703 | /* Adjust the wait time */ |
1704 | if (bw->bwend.tv_sec) { |
1705 | bw->thresh /= 2; |
1706 | if (bw->thresh < bw->buflen / 4) |
1707 | bw->thresh = bw->buflen / 4; |
1708 | } else if (bw->bwend.tv_usec < 10000) { |
1709 | bw->thresh *= 2; |
1710 | if (bw->thresh > bw->buflen * 8) |
1711 | bw->thresh = bw->buflen * 8; |
1712 | } |
1713 | |
1714 | TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts)do { (&ts)->tv_sec = (&bw->bwend)->tv_sec; ( &ts)->tv_nsec = (&bw->bwend)->tv_usec * 1000 ; } while (0); |
1715 | while (nanosleep(&ts, &rm) == -1) { |
1716 | if (errno(*__errno()) != EINTR4) |
1717 | break; |
1718 | ts = rm; |
1719 | } |
1720 | } |
1721 | |
1722 | bw->lamt = 0; |
1723 | monotime_tv(&bw->bwstart); |
1724 | } |
1725 | |
1726 | /* Make a template filename for mk[sd]temp() */ |
1727 | void |
1728 | mktemp_proto(char *s, size_t len) |
1729 | { |
1730 | const char *tmpdir; |
1731 | int r; |
1732 | |
1733 | if ((tmpdir = getenv("TMPDIR")) != NULL((void *)0)) { |
1734 | r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); |
1735 | if (r > 0 && (size_t)r < len) |
1736 | return; |
1737 | } |
1738 | r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); |
1739 | if (r < 0 || (size_t)r >= len) |
1740 | fatal_f("template string too short")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1740 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "template string too short" ); |
1741 | } |
1742 | |
1743 | static const struct { |
1744 | const char *name; |
1745 | int value; |
1746 | } ipqos[] = { |
1747 | { "none", INT_MAX0x7fffffff }, /* can't use 0 here; that's CS0 */ |
1748 | { "af11", IPTOS_DSCP_AF110x28 }, |
1749 | { "af12", IPTOS_DSCP_AF120x30 }, |
1750 | { "af13", IPTOS_DSCP_AF130x38 }, |
1751 | { "af21", IPTOS_DSCP_AF210x48 }, |
1752 | { "af22", IPTOS_DSCP_AF220x50 }, |
1753 | { "af23", IPTOS_DSCP_AF230x58 }, |
1754 | { "af31", IPTOS_DSCP_AF310x68 }, |
1755 | { "af32", IPTOS_DSCP_AF320x70 }, |
1756 | { "af33", IPTOS_DSCP_AF330x78 }, |
1757 | { "af41", IPTOS_DSCP_AF410x88 }, |
1758 | { "af42", IPTOS_DSCP_AF420x90 }, |
1759 | { "af43", IPTOS_DSCP_AF430x98 }, |
1760 | { "cs0", IPTOS_DSCP_CS00x00 }, |
1761 | { "cs1", IPTOS_DSCP_CS10x20 }, |
1762 | { "cs2", IPTOS_DSCP_CS20x40 }, |
1763 | { "cs3", IPTOS_DSCP_CS30x60 }, |
1764 | { "cs4", IPTOS_DSCP_CS40x80 }, |
1765 | { "cs5", IPTOS_DSCP_CS50xa0 }, |
1766 | { "cs6", IPTOS_DSCP_CS60xc0 }, |
1767 | { "cs7", IPTOS_DSCP_CS70xe0 }, |
1768 | { "ef", IPTOS_DSCP_EF0xb8 }, |
1769 | { "le", IPTOS_DSCP_LE0x04 }, |
1770 | { "lowdelay", IPTOS_LOWDELAY0x10 }, |
1771 | { "throughput", IPTOS_THROUGHPUT0x08 }, |
1772 | { "reliability", IPTOS_RELIABILITY0x04 }, |
1773 | { NULL((void *)0), -1 } |
1774 | }; |
1775 | |
1776 | int |
1777 | parse_ipqos(const char *cp) |
1778 | { |
1779 | u_int i; |
1780 | char *ep; |
1781 | long val; |
1782 | |
1783 | if (cp == NULL((void *)0)) |
1784 | return -1; |
1785 | for (i = 0; ipqos[i].name != NULL((void *)0); i++) { |
1786 | if (strcasecmp(cp, ipqos[i].name) == 0) |
1787 | return ipqos[i].value; |
1788 | } |
1789 | /* Try parsing as an integer */ |
1790 | val = strtol(cp, &ep, 0); |
1791 | if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) |
1792 | return -1; |
1793 | return val; |
1794 | } |
1795 | |
1796 | const char * |
1797 | iptos2str(int iptos) |
1798 | { |
1799 | int i; |
1800 | static char iptos_str[sizeof "0xff"]; |
1801 | |
1802 | for (i = 0; ipqos[i].name != NULL((void *)0); i++) { |
1803 | if (ipqos[i].value == iptos) |
1804 | return ipqos[i].name; |
1805 | } |
1806 | snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); |
1807 | return iptos_str; |
1808 | } |
1809 | |
1810 | void |
1811 | lowercase(char *s) |
1812 | { |
1813 | for (; *s; s++) |
1814 | *s = tolower((u_char)*s); |
1815 | } |
1816 | |
1817 | int |
1818 | unix_listener(const char *path, int backlog, int unlink_first) |
1819 | { |
1820 | struct sockaddr_un sunaddr; |
1821 | int saved_errno, sock; |
1822 | |
1823 | memset(&sunaddr, 0, sizeof(sunaddr)); |
1824 | sunaddr.sun_family = AF_UNIX1; |
1825 | if (strlcpy(sunaddr.sun_path, path, |
1826 | sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { |
1827 | error_f("path \"%s\" too long for Unix domain socket", path)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1827, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "path \"%s\" too long for Unix domain socket" , path); |
1828 | errno(*__errno()) = ENAMETOOLONG63; |
1829 | return -1; |
1830 | } |
1831 | |
1832 | sock = socket(PF_UNIX1, SOCK_STREAM1, 0); |
1833 | if (sock == -1) { |
1834 | saved_errno = errno(*__errno()); |
1835 | error_f("socket: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1835, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "socket: %.100s", strerror ((*__errno()))); |
1836 | errno(*__errno()) = saved_errno; |
1837 | return -1; |
1838 | } |
1839 | if (unlink_first == 1) { |
1840 | if (unlink(path) != 0 && errno(*__errno()) != ENOENT2) |
1841 | error("unlink(%s): %.100s", path, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1841, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "unlink(%s): %.100s", path , strerror((*__errno()))); |
1842 | } |
1843 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) { |
1844 | saved_errno = errno(*__errno()); |
1845 | error_f("cannot bind to path %s: %s", path, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1845, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "cannot bind to path %s: %s" , path, strerror((*__errno()))); |
1846 | close(sock); |
1847 | errno(*__errno()) = saved_errno; |
1848 | return -1; |
1849 | } |
1850 | if (listen(sock, backlog) == -1) { |
1851 | saved_errno = errno(*__errno()); |
1852 | error_f("cannot listen on path %s: %s", path, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1852, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "cannot listen on path %s: %s" , path, strerror((*__errno()))); |
1853 | close(sock); |
1854 | unlink(path); |
1855 | errno(*__errno()) = saved_errno; |
1856 | return -1; |
1857 | } |
1858 | return sock; |
1859 | } |
1860 | |
1861 | /* |
1862 | * Compares two strings that maybe be NULL. Returns non-zero if strings |
1863 | * are both NULL or are identical, returns zero otherwise. |
1864 | */ |
1865 | static int |
1866 | strcmp_maybe_null(const char *a, const char *b) |
1867 | { |
1868 | if ((a == NULL((void *)0) && b != NULL((void *)0)) || (a != NULL((void *)0) && b == NULL((void *)0))) |
1869 | return 0; |
1870 | if (a != NULL((void *)0) && strcmp(a, b) != 0) |
1871 | return 0; |
1872 | return 1; |
1873 | } |
1874 | |
1875 | /* |
1876 | * Compare two forwards, returning non-zero if they are identical or |
1877 | * zero otherwise. |
1878 | */ |
1879 | int |
1880 | forward_equals(const struct Forward *a, const struct Forward *b) |
1881 | { |
1882 | if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0) |
1883 | return 0; |
1884 | if (a->listen_port != b->listen_port) |
1885 | return 0; |
1886 | if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0) |
1887 | return 0; |
1888 | if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0) |
1889 | return 0; |
1890 | if (a->connect_port != b->connect_port) |
1891 | return 0; |
1892 | if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0) |
1893 | return 0; |
1894 | /* allocated_port and handle are not checked */ |
1895 | return 1; |
1896 | } |
1897 | |
1898 | /* returns 1 if process is already daemonized, 0 otherwise */ |
1899 | int |
1900 | daemonized(void) |
1901 | { |
1902 | int fd; |
1903 | |
1904 | if ((fd = open(_PATH_TTY"/dev/tty", O_RDONLY0x0000 | O_NOCTTY0x8000)) >= 0) { |
1905 | close(fd); |
1906 | return 0; /* have controlling terminal */ |
1907 | } |
1908 | if (getppid() != 1) |
1909 | return 0; /* parent is not init */ |
1910 | if (getsid(0) != getpid()) |
1911 | return 0; /* not session leader */ |
1912 | debug3("already daemonized")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1912, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "already daemonized"); |
1913 | return 1; |
1914 | } |
1915 | |
1916 | /* |
1917 | * Splits 's' into an argument vector. Handles quoted string and basic |
1918 | * escape characters (\\, \", \'). Caller must free the argument vector |
1919 | * and its members. |
1920 | */ |
1921 | int |
1922 | argv_split(const char *s, int *argcp, char ***argvp, int terminate_on_comment) |
1923 | { |
1924 | int r = SSH_ERR_INTERNAL_ERROR-1; |
1925 | int argc = 0, quote, i, j; |
1926 | char *arg, **argv = xcalloc(1, sizeof(*argv)); |
1927 | |
1928 | *argvp = NULL((void *)0); |
1929 | *argcp = 0; |
1930 | |
1931 | for (i = 0; s[i] != '\0'; i++) { |
1932 | /* Skip leading whitespace */ |
1933 | if (s[i] == ' ' || s[i] == '\t') |
1934 | continue; |
1935 | if (terminate_on_comment && s[i] == '#') |
1936 | break; |
1937 | /* Start of a token */ |
1938 | quote = 0; |
1939 | |
1940 | argv = xreallocarray(argv, (argc + 2), sizeof(*argv)); |
1941 | arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1); |
1942 | argv[argc] = NULL((void *)0); |
1943 | |
1944 | /* Copy the token in, removing escapes */ |
1945 | for (j = 0; s[i] != '\0'; i++) { |
1946 | if (s[i] == '\\') { |
1947 | if (s[i + 1] == '\'' || |
1948 | s[i + 1] == '\"' || |
1949 | s[i + 1] == '\\' || |
1950 | (quote == 0 && s[i + 1] == ' ')) { |
1951 | i++; /* Skip '\' */ |
1952 | arg[j++] = s[i]; |
1953 | } else { |
1954 | /* Unrecognised escape */ |
1955 | arg[j++] = s[i]; |
1956 | } |
1957 | } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t')) |
1958 | break; /* done */ |
1959 | else if (quote == 0 && (s[i] == '\"' || s[i] == '\'')) |
1960 | quote = s[i]; /* quote start */ |
1961 | else if (quote != 0 && s[i] == quote) |
1962 | quote = 0; /* quote end */ |
1963 | else |
1964 | arg[j++] = s[i]; |
1965 | } |
1966 | if (s[i] == '\0') { |
1967 | if (quote != 0) { |
1968 | /* Ran out of string looking for close quote */ |
1969 | r = SSH_ERR_INVALID_FORMAT-4; |
1970 | goto out; |
1971 | } |
1972 | break; |
1973 | } |
1974 | } |
1975 | /* Success */ |
1976 | *argcp = argc; |
1977 | *argvp = argv; |
1978 | argc = 0; |
1979 | argv = NULL((void *)0); |
1980 | r = 0; |
1981 | out: |
1982 | if (argc != 0 && argv != NULL((void *)0)) { |
1983 | for (i = 0; i < argc; i++) |
1984 | free(argv[i]); |
1985 | free(argv); |
1986 | } |
1987 | return r; |
1988 | } |
1989 | |
1990 | /* |
1991 | * Reassemble an argument vector into a string, quoting and escaping as |
1992 | * necessary. Caller must free returned string. |
1993 | */ |
1994 | char * |
1995 | argv_assemble(int argc, char **argv) |
1996 | { |
1997 | int i, j, ws, r; |
1998 | char c, *ret; |
1999 | struct sshbuf *buf, *arg; |
2000 | |
2001 | if ((buf = sshbuf_new()) == NULL((void *)0) || (arg = sshbuf_new()) == NULL((void *)0)) |
2002 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2002 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed"); |
2003 | |
2004 | for (i = 0; i < argc; i++) { |
2005 | ws = 0; |
2006 | sshbuf_reset(arg); |
2007 | for (j = 0; argv[i][j] != '\0'; j++) { |
2008 | r = 0; |
2009 | c = argv[i][j]; |
2010 | switch (c) { |
2011 | case ' ': |
2012 | case '\t': |
2013 | ws = 1; |
2014 | r = sshbuf_put_u8(arg, c); |
2015 | break; |
2016 | case '\\': |
2017 | case '\'': |
2018 | case '"': |
2019 | if ((r = sshbuf_put_u8(arg, '\\')) != 0) |
2020 | break; |
2021 | /* FALLTHROUGH */ |
2022 | default: |
2023 | r = sshbuf_put_u8(arg, c); |
2024 | break; |
2025 | } |
2026 | if (r != 0) |
2027 | fatal_fr(r, "sshbuf_put_u8")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2027 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put_u8"); |
2028 | } |
2029 | if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) || |
2030 | (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) || |
2031 | (r = sshbuf_putb(buf, arg)) != 0 || |
2032 | (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0)) |
2033 | fatal_fr(r, "assemble")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2033 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "assemble"); |
2034 | } |
2035 | if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL((void *)0)) |
2036 | fatal_f("malloc failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2036 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "malloc failed"); |
2037 | memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf)); |
2038 | ret[sshbuf_len(buf)] = '\0'; |
2039 | sshbuf_free(buf); |
2040 | sshbuf_free(arg); |
2041 | return ret; |
2042 | } |
2043 | |
2044 | char * |
2045 | argv_next(int *argcp, char ***argvp) |
2046 | { |
2047 | char *ret = (*argvp)[0]; |
2048 | |
2049 | if (*argcp > 0 && ret != NULL((void *)0)) { |
2050 | (*argcp)--; |
2051 | (*argvp)++; |
2052 | } |
2053 | return ret; |
2054 | } |
2055 | |
2056 | void |
2057 | argv_consume(int *argcp) |
2058 | { |
2059 | *argcp = 0; |
2060 | } |
2061 | |
2062 | void |
2063 | argv_free(char **av, int ac) |
2064 | { |
2065 | int i; |
2066 | |
2067 | if (av == NULL((void *)0)) |
2068 | return; |
2069 | for (i = 0; i < ac; i++) |
2070 | free(av[i]); |
2071 | free(av); |
2072 | } |
2073 | |
2074 | /* Returns 0 if pid exited cleanly, non-zero otherwise */ |
2075 | int |
2076 | exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet) |
2077 | { |
2078 | int status; |
2079 | |
2080 | while (waitpid(pid, &status, 0) == -1) { |
2081 | if (errno(*__errno()) != EINTR4) { |
2082 | error("%s waitpid: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2082, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s waitpid: %s", tag, strerror ((*__errno()))); |
2083 | return -1; |
2084 | } |
2085 | } |
2086 | if (WIFSIGNALED(status)(((status) & 0177) != 0177 && ((status) & 0177 ) != 0)) { |
2087 | error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2087, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s %s exited on signal %d" , tag, cmd, (((status) & 0177))); |
2088 | return -1; |
2089 | } else if (WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) != 0) { |
2090 | do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2091, 0 , quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO, ((void *)0 ), "%s %s failed, status %d", tag, cmd, (int)(((unsigned)(status ) >> 8) & 0xff)) |
2091 | "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2091, 0 , quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO, ((void *)0 ), "%s %s failed, status %d", tag, cmd, (int)(((unsigned)(status ) >> 8) & 0xff)); |
2092 | return -1; |
2093 | } |
2094 | return 0; |
2095 | } |
2096 | |
2097 | /* |
2098 | * Check a given path for security. This is defined as all components |
2099 | * of the path to the file must be owned by either the owner of |
2100 | * of the file or root and no directories must be group or world writable. |
2101 | * |
2102 | * XXX Should any specific check be done for sym links ? |
2103 | * |
2104 | * Takes a file name, its stat information (preferably from fstat() to |
2105 | * avoid races), the uid of the expected owner, their home directory and an |
2106 | * error buffer plus max size as arguments. |
2107 | * |
2108 | * Returns 0 on success and -1 on failure |
2109 | */ |
2110 | int |
2111 | safe_path(const char *name, struct stat *stp, const char *pw_dir, |
2112 | uid_t uid, char *err, size_t errlen) |
2113 | { |
2114 | char buf[PATH_MAX1024], homedir[PATH_MAX1024]; |
2115 | char *cp; |
2116 | int comparehome = 0; |
2117 | struct stat st; |
2118 | |
2119 | if (realpath(name, buf) == NULL((void *)0)) { |
2120 | snprintf(err, errlen, "realpath %s failed: %s", name, |
2121 | strerror(errno(*__errno()))); |
2122 | return -1; |
2123 | } |
2124 | if (pw_dir != NULL((void *)0) && realpath(pw_dir, homedir) != NULL((void *)0)) |
2125 | comparehome = 1; |
2126 | |
2127 | if (!S_ISREG(stp->st_mode)((stp->st_mode & 0170000) == 0100000)) { |
2128 | snprintf(err, errlen, "%s is not a regular file", buf); |
2129 | return -1; |
2130 | } |
2131 | if ((stp->st_uid != 0 && stp->st_uid != uid) || |
2132 | (stp->st_mode & 022) != 0) { |
2133 | snprintf(err, errlen, "bad ownership or modes for file %s", |
2134 | buf); |
2135 | return -1; |
2136 | } |
2137 | |
2138 | /* for each component of the canonical path, walking upwards */ |
2139 | for (;;) { |
2140 | if ((cp = dirname(buf)) == NULL((void *)0)) { |
2141 | snprintf(err, errlen, "dirname() failed"); |
2142 | return -1; |
2143 | } |
2144 | strlcpy(buf, cp, sizeof(buf)); |
2145 | |
2146 | if (stat(buf, &st) == -1 || |
2147 | (st.st_uid != 0 && st.st_uid != uid) || |
2148 | (st.st_mode & 022) != 0) { |
2149 | snprintf(err, errlen, |
2150 | "bad ownership or modes for directory %s", buf); |
2151 | return -1; |
2152 | } |
2153 | |
2154 | /* If are past the homedir then we can stop */ |
2155 | if (comparehome && strcmp(homedir, buf) == 0) |
2156 | break; |
2157 | |
2158 | /* |
2159 | * dirname should always complete with a "/" path, |
2160 | * but we can be paranoid and check for "." too |
2161 | */ |
2162 | if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) |
2163 | break; |
2164 | } |
2165 | return 0; |
2166 | } |
2167 | |
2168 | /* |
2169 | * Version of safe_path() that accepts an open file descriptor to |
2170 | * avoid races. |
2171 | * |
2172 | * Returns 0 on success and -1 on failure |
2173 | */ |
2174 | int |
2175 | safe_path_fd(int fd, const char *file, struct passwd *pw, |
2176 | char *err, size_t errlen) |
2177 | { |
2178 | struct stat st; |
2179 | |
2180 | /* check the open file to avoid races */ |
2181 | if (fstat(fd, &st) == -1) { |
2182 | snprintf(err, errlen, "cannot stat file %s: %s", |
2183 | file, strerror(errno(*__errno()))); |
2184 | return -1; |
2185 | } |
2186 | return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); |
2187 | } |
2188 | |
2189 | /* |
2190 | * Sets the value of the given variable in the environment. If the variable |
2191 | * already exists, its value is overridden. |
2192 | */ |
2193 | void |
2194 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
2195 | const char *value) |
2196 | { |
2197 | char **env; |
2198 | u_int envsize; |
2199 | u_int i, namelen; |
2200 | |
2201 | if (strchr(name, '=') != NULL((void *)0)) { |
2202 | error("Invalid environment variable \"%.100s\"", name)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2202, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Invalid environment variable \"%.100s\"" , name); |
2203 | return; |
2204 | } |
2205 | |
2206 | /* |
2207 | * Find the slot where the value should be stored. If the variable |
2208 | * already exists, we reuse the slot; otherwise we append a new slot |
2209 | * at the end of the array, expanding if necessary. |
2210 | */ |
2211 | env = *envp; |
2212 | namelen = strlen(name); |
2213 | for (i = 0; env[i]; i++) |
2214 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') |
2215 | break; |
2216 | if (env[i]) { |
2217 | /* Reuse the slot. */ |
2218 | free(env[i]); |
2219 | } else { |
2220 | /* New variable. Expand if necessary. */ |
2221 | envsize = *envsizep; |
2222 | if (i >= envsize - 1) { |
2223 | if (envsize >= 1000) |
2224 | fatal("child_set_env: too many env vars")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2224 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "child_set_env: too many env vars" ); |
2225 | envsize += 50; |
2226 | env = (*envp) = xreallocarray(env, envsize, sizeof(char *)); |
2227 | *envsizep = envsize; |
2228 | } |
2229 | /* Need to set the NULL pointer at end of array beyond the new slot. */ |
2230 | env[i + 1] = NULL((void *)0); |
2231 | } |
2232 | |
2233 | /* Allocate space and format the variable in the appropriate slot. */ |
2234 | /* XXX xasprintf */ |
2235 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); |
2236 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); |
2237 | } |
2238 | |
2239 | /* |
2240 | * Check and optionally lowercase a domain name, also removes trailing '.' |
2241 | * Returns 1 on success and 0 on failure, storing an error message in errstr. |
2242 | */ |
2243 | int |
2244 | valid_domain(char *name, int makelower, const char **errstr) |
2245 | { |
2246 | size_t i, l = strlen(name); |
2247 | u_char c, last = '\0'; |
2248 | static char errbuf[256]; |
2249 | |
2250 | if (l == 0) { |
2251 | strlcpy(errbuf, "empty domain name", sizeof(errbuf)); |
2252 | goto bad; |
2253 | } |
2254 | if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) { |
2255 | snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" " |
2256 | "starts with invalid character", name); |
2257 | goto bad; |
2258 | } |
2259 | for (i = 0; i < l; i++) { |
2260 | c = tolower((u_char)name[i]); |
2261 | if (makelower) |
2262 | name[i] = (char)c; |
2263 | if (last == '.' && c == '.') { |
2264 | snprintf(errbuf, sizeof(errbuf), "domain name " |
2265 | "\"%.100s\" contains consecutive separators", name); |
2266 | goto bad; |
2267 | } |
2268 | if (c != '.' && c != '-' && !isalnum(c) && |
2269 | c != '_') /* technically invalid, but common */ { |
2270 | snprintf(errbuf, sizeof(errbuf), "domain name " |
2271 | "\"%.100s\" contains invalid characters", name); |
2272 | goto bad; |
2273 | } |
2274 | last = c; |
2275 | } |
2276 | if (name[l - 1] == '.') |
2277 | name[l - 1] = '\0'; |
2278 | if (errstr != NULL((void *)0)) |
2279 | *errstr = NULL((void *)0); |
2280 | return 1; |
2281 | bad: |
2282 | if (errstr != NULL((void *)0)) |
2283 | *errstr = errbuf; |
2284 | return 0; |
2285 | } |
2286 | |
2287 | /* |
2288 | * Verify that a environment variable name (not including initial '$') is |
2289 | * valid; consisting of one or more alphanumeric or underscore characters only. |
2290 | * Returns 1 on valid, 0 otherwise. |
2291 | */ |
2292 | int |
2293 | valid_env_name(const char *name) |
2294 | { |
2295 | const char *cp; |
2296 | |
2297 | if (name[0] == '\0') |
2298 | return 0; |
2299 | for (cp = name; *cp != '\0'; cp++) { |
2300 | if (!isalnum((u_char)*cp) && *cp != '_') |
2301 | return 0; |
2302 | } |
2303 | return 1; |
2304 | } |
2305 | |
2306 | const char * |
2307 | atoi_err(const char *nptr, int *val) |
2308 | { |
2309 | const char *errstr = NULL((void *)0); |
2310 | long long num; |
2311 | |
2312 | if (nptr == NULL((void *)0) || *nptr == '\0') |
2313 | return "missing"; |
2314 | num = strtonum(nptr, 0, INT_MAX0x7fffffff, &errstr); |
2315 | if (errstr == NULL((void *)0)) |
2316 | *val = (int)num; |
2317 | return errstr; |
2318 | } |
2319 | |
2320 | int |
2321 | parse_absolute_time(const char *s, uint64_t *tp) |
2322 | { |
2323 | struct tm tm; |
2324 | time_t tt; |
2325 | char buf[32], *fmt; |
2326 | const char *cp; |
2327 | size_t l; |
2328 | int is_utc = 0; |
2329 | |
2330 | *tp = 0; |
2331 | |
2332 | l = strlen(s); |
2333 | if (l > 1 && strcasecmp(s + l - 1, "Z") == 0) { |
2334 | is_utc = 1; |
2335 | l--; |
2336 | } else if (l > 3 && strcasecmp(s + l - 3, "UTC") == 0) { |
2337 | is_utc = 1; |
2338 | l -= 3; |
2339 | } |
2340 | /* |
2341 | * POSIX strptime says "The application shall ensure that there |
2342 | * is white-space or other non-alphanumeric characters between |
2343 | * any two conversion specifications" so arrange things this way. |
2344 | */ |
2345 | switch (l) { |
2346 | case 8: /* YYYYMMDD */ |
2347 | fmt = "%Y-%m-%d"; |
2348 | snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); |
2349 | break; |
2350 | case 12: /* YYYYMMDDHHMM */ |
2351 | fmt = "%Y-%m-%dT%H:%M"; |
2352 | snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s", |
2353 | s, s + 4, s + 6, s + 8, s + 10); |
2354 | break; |
2355 | case 14: /* YYYYMMDDHHMMSS */ |
2356 | fmt = "%Y-%m-%dT%H:%M:%S"; |
2357 | snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", |
2358 | s, s + 4, s + 6, s + 8, s + 10, s + 12); |
2359 | break; |
2360 | default: |
2361 | return SSH_ERR_INVALID_FORMAT-4; |
2362 | } |
2363 | |
2364 | memset(&tm, 0, sizeof(tm)); |
2365 | if ((cp = strptime(buf, fmt, &tm)) == NULL((void *)0) || *cp != '\0') |
2366 | return SSH_ERR_INVALID_FORMAT-4; |
2367 | if (is_utc) { |
2368 | if ((tt = timegm(&tm)) < 0) |
2369 | return SSH_ERR_INVALID_FORMAT-4; |
2370 | } else { |
2371 | if ((tt = mktime(&tm)) < 0) |
2372 | return SSH_ERR_INVALID_FORMAT-4; |
2373 | } |
2374 | /* success */ |
2375 | *tp = (uint64_t)tt; |
2376 | return 0; |
2377 | } |
2378 | |
2379 | void |
2380 | format_absolute_time(uint64_t t, char *buf, size_t len) |
2381 | { |
2382 | time_t tt = t > SSH_TIME_T_MAX0x7fffffffffffffffLL ? SSH_TIME_T_MAX0x7fffffffffffffffLL : t; |
2383 | struct tm tm; |
2384 | |
2385 | localtime_r(&tt, &tm); |
2386 | strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm); |
2387 | } |
2388 | |
2389 | /* |
2390 | * Parse a "pattern=interval" clause (e.g. a ChannelTimeout). |
2391 | * Returns 0 on success or non-zero on failure. |
2392 | * Caller must free *typep. |
2393 | */ |
2394 | int |
2395 | parse_pattern_interval(const char *s, char **typep, int *secsp) |
2396 | { |
2397 | char *cp, *sdup; |
2398 | int secs; |
2399 | |
2400 | if (typep != NULL((void *)0)) |
2401 | *typep = NULL((void *)0); |
2402 | if (secsp != NULL((void *)0)) |
2403 | *secsp = 0; |
2404 | if (s == NULL((void *)0)) |
2405 | return -1; |
2406 | sdup = xstrdup(s); |
2407 | |
2408 | if ((cp = strchr(sdup, '=')) == NULL((void *)0) || cp == sdup) { |
2409 | free(sdup); |
2410 | return -1; |
2411 | } |
2412 | *cp++ = '\0'; |
2413 | if ((secs = convtime(cp)) < 0) { |
2414 | free(sdup); |
2415 | return -1; |
2416 | } |
2417 | /* success */ |
2418 | if (typep != NULL((void *)0)) |
2419 | *typep = xstrdup(sdup); |
2420 | if (secsp != NULL((void *)0)) |
2421 | *secsp = secs; |
2422 | free(sdup); |
2423 | return 0; |
2424 | } |
2425 | |
2426 | /* check if path is absolute */ |
2427 | int |
2428 | path_absolute(const char *path) |
2429 | { |
2430 | return (*path == '/') ? 1 : 0; |
2431 | } |
2432 | |
2433 | void |
2434 | skip_space(char **cpp) |
2435 | { |
2436 | char *cp; |
2437 | |
2438 | for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++) |
2439 | ; |
2440 | *cpp = cp; |
2441 | } |
2442 | |
2443 | /* authorized_key-style options parsing helpers */ |
2444 | |
2445 | /* |
2446 | * Match flag 'opt' in *optsp, and if allow_negate is set then also match |
2447 | * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0 |
2448 | * if negated option matches. |
2449 | * If the option or negated option matches, then *optsp is updated to |
2450 | * point to the first character after the option. |
2451 | */ |
2452 | int |
2453 | opt_flag(const char *opt, int allow_negate, const char **optsp) |
2454 | { |
2455 | size_t opt_len = strlen(opt); |
2456 | const char *opts = *optsp; |
2457 | int negate = 0; |
2458 | |
2459 | if (allow_negate && strncasecmp(opts, "no-", 3) == 0) { |
2460 | opts += 3; |
2461 | negate = 1; |
2462 | } |
2463 | if (strncasecmp(opts, opt, opt_len) == 0) { |
2464 | *optsp = opts + opt_len; |
2465 | return negate ? 0 : 1; |
2466 | } |
2467 | return -1; |
2468 | } |
2469 | |
2470 | char * |
2471 | opt_dequote(const char **sp, const char **errstrp) |
2472 | { |
2473 | const char *s = *sp; |
2474 | char *ret; |
2475 | size_t i; |
2476 | |
2477 | *errstrp = NULL((void *)0); |
2478 | if (*s != '"') { |
2479 | *errstrp = "missing start quote"; |
2480 | return NULL((void *)0); |
2481 | } |
2482 | s++; |
2483 | if ((ret = malloc(strlen((s)) + 1)) == NULL((void *)0)) { |
2484 | *errstrp = "memory allocation failed"; |
2485 | return NULL((void *)0); |
2486 | } |
2487 | for (i = 0; *s != '\0' && *s != '"';) { |
2488 | if (s[0] == '\\' && s[1] == '"') |
2489 | s++; |
2490 | ret[i++] = *s++; |
2491 | } |
2492 | if (*s == '\0') { |
2493 | *errstrp = "missing end quote"; |
2494 | free(ret); |
2495 | return NULL((void *)0); |
2496 | } |
2497 | ret[i] = '\0'; |
2498 | s++; |
2499 | *sp = s; |
2500 | return ret; |
2501 | } |
2502 | |
2503 | int |
2504 | opt_match(const char **opts, const char *term) |
2505 | { |
2506 | if (strncasecmp((*opts), term, strlen(term)) == 0 && |
2507 | (*opts)[strlen(term)] == '=') { |
2508 | *opts += strlen(term) + 1; |
2509 | return 1; |
2510 | } |
2511 | return 0; |
2512 | } |
2513 | |
2514 | void |
2515 | opt_array_append2(const char *file, const int line, const char *directive, |
2516 | char ***array, int **iarray, u_int *lp, const char *s, int i) |
2517 | { |
2518 | |
2519 | if (*lp >= INT_MAX0x7fffffff) |
2520 | fatal("%s line %d: Too many %s entries", file, line, directive)sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2520 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "%s line %d: Too many %s entries" , file, line, directive); |
2521 | |
2522 | if (iarray != NULL((void *)0)) { |
2523 | *iarray = xrecallocarray(*iarray, *lp, *lp + 1, |
2524 | sizeof(**iarray)); |
2525 | (*iarray)[*lp] = i; |
2526 | } |
2527 | |
2528 | *array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array)); |
2529 | (*array)[*lp] = xstrdup(s); |
2530 | (*lp)++; |
2531 | } |
2532 | |
2533 | void |
2534 | opt_array_append(const char *file, const int line, const char *directive, |
2535 | char ***array, u_int *lp, const char *s) |
2536 | { |
2537 | opt_array_append2(file, line, directive, array, NULL((void *)0), lp, s, 0); |
2538 | } |
2539 | |
2540 | sshsig_t |
2541 | ssh_signal(int signum, sshsig_t handler) |
2542 | { |
2543 | struct sigaction sa, osa; |
2544 | |
2545 | /* mask all other signals while in handler */ |
2546 | memset(&sa, 0, sizeof(sa)); |
2547 | sa.sa_handler__sigaction_u.__sa_handler = handler; |
2548 | sigfillset(&sa.sa_mask); |
2549 | if (signum != SIGALRM14) |
2550 | sa.sa_flags = SA_RESTART0x0002; |
2551 | if (sigaction(signum, &sa, &osa) == -1) { |
2552 | debug3("sigaction(%s): %s", strsignal(signum), strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2552, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "sigaction(%s): %s", strsignal (signum), strerror((*__errno()))); |
2553 | return SIG_ERR(void (*)(int))-1; |
2554 | } |
2555 | return osa.sa_handler__sigaction_u.__sa_handler; |
2556 | } |
2557 | |
2558 | int |
2559 | stdfd_devnull(int do_stdin, int do_stdout, int do_stderr) |
2560 | { |
2561 | int devnull, ret = 0; |
2562 | |
2563 | if ((devnull = open(_PATH_DEVNULL"/dev/null", O_RDWR0x0002)) == -1) { |
2564 | error_f("open %s: %s", _PATH_DEVNULL,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2565, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "open %s: %s", "/dev/null" , strerror((*__errno()))) |
2565 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2565, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "open %s: %s", "/dev/null" , strerror((*__errno()))); |
2566 | return -1; |
2567 | } |
2568 | if ((do_stdin && dup2(devnull, STDIN_FILENO0) == -1) || |
2569 | (do_stdout && dup2(devnull, STDOUT_FILENO1) == -1) || |
2570 | (do_stderr && dup2(devnull, STDERR_FILENO2) == -1)) { |
2571 | error_f("dup2: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2571, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "dup2: %s", strerror((*__errno ()))); |
2572 | ret = -1; |
2573 | } |
2574 | if (devnull > STDERR_FILENO2) |
2575 | close(devnull); |
2576 | return ret; |
2577 | } |
2578 | |
2579 | /* |
2580 | * Runs command in a subprocess with a minimal environment. |
2581 | * Returns pid on success, 0 on failure. |
2582 | * The child stdout and stderr maybe captured, left attached or sent to |
2583 | * /dev/null depending on the contents of flags. |
2584 | * "tag" is prepended to log messages. |
2585 | * NB. "command" is only used for logging; the actual command executed is |
2586 | * av[0]. |
2587 | */ |
2588 | pid_t |
2589 | subprocess(const char *tag, const char *command, |
2590 | int ac, char **av, FILE **child, u_int flags, |
2591 | struct passwd *pw, privdrop_fn *drop_privs, privrestore_fn *restore_privs) |
2592 | { |
2593 | FILE *f = NULL((void *)0); |
2594 | struct stat st; |
2595 | int fd, devnull, p[2], i; |
2596 | pid_t pid; |
2597 | char *cp, errmsg[512]; |
2598 | u_int nenv = 0; |
2599 | char **env = NULL((void *)0); |
2600 | |
2601 | /* If dropping privs, then must specify user and restore function */ |
2602 | if (drop_privs != NULL((void *)0) && (pw == NULL((void *)0) || restore_privs == NULL((void *)0))) { |
2603 | error("%s: inconsistent arguments", tag)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2603, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: inconsistent arguments" , tag); /* XXX fatal? */ |
2604 | return 0; |
2605 | } |
2606 | if (pw == NULL((void *)0) && (pw = getpwuid(getuid())) == NULL((void *)0)) { |
2607 | error("%s: no user for current uid", tag)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2607, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: no user for current uid" , tag); |
2608 | return 0; |
2609 | } |
2610 | if (child != NULL((void *)0)) |
2611 | *child = NULL((void *)0); |
2612 | |
2613 | debug3_f("%s command \"%s\" running as %s (flags 0x%x)",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2614, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s command \"%s\" running as %s (flags 0x%x)" , tag, command, pw->pw_name, flags) |
2614 | tag, command, pw->pw_name, flags)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2614, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s command \"%s\" running as %s (flags 0x%x)" , tag, command, pw->pw_name, flags); |
2615 | |
2616 | /* Check consistency */ |
2617 | if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD(1)) != 0 && |
2618 | (flags & SSH_SUBPROCESS_STDOUT_CAPTURE(1<<1)) != 0) { |
2619 | error_f("inconsistent flags")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2619, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "inconsistent flags"); |
2620 | return 0; |
2621 | } |
2622 | if (((flags & SSH_SUBPROCESS_STDOUT_CAPTURE(1<<1)) == 0) != (child == NULL((void *)0))) { |
2623 | error_f("inconsistent flags/output")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2623, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "inconsistent flags/output" ); |
2624 | return 0; |
2625 | } |
2626 | |
2627 | /* |
2628 | * If executing an explicit binary, then verify the it exists |
2629 | * and appears safe-ish to execute |
2630 | */ |
2631 | if (!path_absolute(av[0])) { |
2632 | error("%s path is not absolute", tag)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2632, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s path is not absolute", tag); |
2633 | return 0; |
2634 | } |
2635 | if (drop_privs != NULL((void *)0)) |
2636 | drop_privs(pw); |
2637 | if (stat(av[0], &st) == -1) { |
2638 | error("Could not stat %s \"%s\": %s", tag,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2639, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Could not stat %s \"%s\": %s" , tag, av[0], strerror((*__errno()))) |
2639 | av[0], strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2639, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Could not stat %s \"%s\": %s" , tag, av[0], strerror((*__errno()))); |
2640 | goto restore_return; |
2641 | } |
2642 | if ((flags & SSH_SUBPROCESS_UNSAFE_PATH(1<<3)) == 0 && |
2643 | safe_path(av[0], &st, NULL((void *)0), 0, errmsg, sizeof(errmsg)) != 0) { |
2644 | error("Unsafe %s \"%s\": %s", tag, av[0], errmsg)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2644, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Unsafe %s \"%s\": %s", tag , av[0], errmsg); |
2645 | goto restore_return; |
2646 | } |
2647 | /* Prepare to keep the child's stdout if requested */ |
2648 | if (pipe(p) == -1) { |
2649 | error("%s: pipe: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2649, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: pipe: %s", tag, strerror ((*__errno()))); |
2650 | restore_return: |
2651 | if (restore_privs != NULL((void *)0)) |
2652 | restore_privs(); |
2653 | return 0; |
2654 | } |
2655 | if (restore_privs != NULL((void *)0)) |
2656 | restore_privs(); |
2657 | |
2658 | switch ((pid = fork())) { |
2659 | case -1: /* error */ |
2660 | error("%s: fork: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2660, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: fork: %s", tag, strerror ((*__errno()))); |
2661 | close(p[0]); |
2662 | close(p[1]); |
2663 | return 0; |
2664 | case 0: /* child */ |
2665 | /* Prepare a minimal environment for the child. */ |
2666 | if ((flags & SSH_SUBPROCESS_PRESERVE_ENV(1<<4)) == 0) { |
2667 | nenv = 5; |
2668 | env = xcalloc(sizeof(*env), nenv); |
2669 | child_set_env(&env, &nenv, "PATH", _PATH_STDPATH"/usr/bin:/bin:/usr/sbin:/sbin:/usr/X11R6/bin:/usr/local/bin:/usr/local/sbin"); |
2670 | child_set_env(&env, &nenv, "USER", pw->pw_name); |
2671 | child_set_env(&env, &nenv, "LOGNAME", pw->pw_name); |
2672 | child_set_env(&env, &nenv, "HOME", pw->pw_dir); |
2673 | if ((cp = getenv("LANG")) != NULL((void *)0)) |
2674 | child_set_env(&env, &nenv, "LANG", cp); |
2675 | } |
2676 | |
2677 | for (i = 1; i < NSIG33; i++) |
2678 | ssh_signal(i, SIG_DFL(void (*)(int))0); |
2679 | |
2680 | if ((devnull = open(_PATH_DEVNULL"/dev/null", O_RDWR0x0002)) == -1) { |
2681 | error("%s: open %s: %s", tag, _PATH_DEVNULL,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2682, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: open %s: %s", tag, "/dev/null" , strerror((*__errno()))) |
2682 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2682, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: open %s: %s", tag, "/dev/null" , strerror((*__errno()))); |
2683 | _exit(1); |
2684 | } |
2685 | if (dup2(devnull, STDIN_FILENO0) == -1) { |
2686 | error("%s: dup2: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2686, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: dup2: %s", tag, strerror ((*__errno()))); |
2687 | _exit(1); |
2688 | } |
2689 | |
2690 | /* Set up stdout as requested; leave stderr in place for now. */ |
2691 | fd = -1; |
2692 | if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE(1<<1)) != 0) |
2693 | fd = p[1]; |
2694 | else if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD(1)) != 0) |
2695 | fd = devnull; |
2696 | if (fd != -1 && dup2(fd, STDOUT_FILENO1) == -1) { |
2697 | error("%s: dup2: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2697, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: dup2: %s", tag, strerror ((*__errno()))); |
2698 | _exit(1); |
2699 | } |
2700 | closefrom(STDERR_FILENO2 + 1); |
2701 | |
2702 | if (geteuid() == 0 && |
2703 | initgroups(pw->pw_name, pw->pw_gid) == -1) { |
2704 | error("%s: initgroups(%s, %u): %s", tag,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2705, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: initgroups(%s, %u): %s" , tag, pw->pw_name, (u_int)pw->pw_gid, strerror((*__errno ()))) |
2705 | pw->pw_name, (u_int)pw->pw_gid, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2705, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: initgroups(%s, %u): %s" , tag, pw->pw_name, (u_int)pw->pw_gid, strerror((*__errno ()))); |
2706 | _exit(1); |
2707 | } |
2708 | if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1) { |
2709 | error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2710, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: setresgid %u: %s", tag , (u_int)pw->pw_gid, strerror((*__errno()))) |
2710 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2710, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: setresgid %u: %s", tag , (u_int)pw->pw_gid, strerror((*__errno()))); |
2711 | _exit(1); |
2712 | } |
2713 | if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1) { |
2714 | error("%s: setresuid %u: %s", tag, (u_int)pw->pw_uid,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2715, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: setresuid %u: %s", tag , (u_int)pw->pw_uid, strerror((*__errno()))) |
2715 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2715, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: setresuid %u: %s", tag , (u_int)pw->pw_uid, strerror((*__errno()))); |
2716 | _exit(1); |
2717 | } |
2718 | /* stdin is pointed to /dev/null at this point */ |
2719 | if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD(1)) != 0 && |
2720 | dup2(STDIN_FILENO0, STDERR_FILENO2) == -1) { |
2721 | error("%s: dup2: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2721, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: dup2: %s", tag, strerror ((*__errno()))); |
2722 | _exit(1); |
2723 | } |
2724 | if (env != NULL((void *)0)) |
2725 | execve(av[0], av, env); |
2726 | else |
2727 | execv(av[0], av); |
2728 | error("%s %s \"%s\": %s", tag, env == NULL ? "execv" : "execve",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2729, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s %s \"%s\": %s", tag, env == ((void *)0) ? "execv" : "execve", command, strerror((*__errno ()))) |
2729 | command, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2729, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s %s \"%s\": %s", tag, env == ((void *)0) ? "execv" : "execve", command, strerror((*__errno ()))); |
2730 | _exit(127); |
2731 | default: /* parent */ |
2732 | break; |
2733 | } |
2734 | |
2735 | close(p[1]); |
2736 | if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE(1<<1)) == 0) |
2737 | close(p[0]); |
2738 | else if ((f = fdopen(p[0], "r")) == NULL((void *)0)) { |
2739 | error("%s: fdopen: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2739, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: fdopen: %s", tag, strerror ((*__errno()))); |
2740 | close(p[0]); |
2741 | /* Don't leave zombie child */ |
2742 | kill(pid, SIGTERM15); |
2743 | while (waitpid(pid, NULL((void *)0), 0) == -1 && errno(*__errno()) == EINTR4) |
2744 | ; |
2745 | return 0; |
2746 | } |
2747 | /* Success */ |
2748 | debug3_f("%s pid %ld", tag, (long)pid)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2748, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s pid %ld", tag, (long) pid); |
2749 | if (child != NULL((void *)0)) |
2750 | *child = f; |
2751 | return pid; |
2752 | } |
2753 | |
2754 | const char * |
2755 | lookup_env_in_list(const char *env, char * const *envs, size_t nenvs) |
2756 | { |
2757 | size_t i, envlen; |
2758 | |
2759 | envlen = strlen(env); |
2760 | for (i = 0; i < nenvs; i++) { |
2761 | if (strncmp(envs[i], env, envlen) == 0 && |
2762 | envs[i][envlen] == '=') { |
2763 | return envs[i] + envlen + 1; |
2764 | } |
2765 | } |
2766 | return NULL((void *)0); |
2767 | } |
2768 | |
2769 | const char * |
2770 | lookup_setenv_in_list(const char *env, char * const *envs, size_t nenvs) |
2771 | { |
2772 | char *name, *cp; |
2773 | const char *ret; |
2774 | |
2775 | name = xstrdup(env); |
2776 | if ((cp = strchr(name, '=')) == NULL((void *)0)) { |
2777 | free(name); |
2778 | return NULL((void *)0); /* not env=val */ |
2779 | } |
2780 | *cp = '\0'; |
2781 | ret = lookup_env_in_list(name, envs, nenvs); |
2782 | free(name); |
2783 | return ret; |
2784 | } |
2785 | |
2786 | /* |
2787 | * Helpers for managing poll(2)/ppoll(2) timeouts |
2788 | * Will remember the earliest deadline and return it for use in poll/ppoll. |
2789 | */ |
2790 | |
2791 | /* Initialise a poll/ppoll timeout with an indefinite deadline */ |
2792 | void |
2793 | ptimeout_init(struct timespec *pt) |
2794 | { |
2795 | /* |
2796 | * Deliberately invalid for ppoll(2). |
2797 | * Will be converted to NULL in ptimeout_get_tspec() later. |
2798 | */ |
2799 | pt->tv_sec = -1; |
2800 | pt->tv_nsec = 0; |
2801 | } |
2802 | |
2803 | /* Specify a poll/ppoll deadline of at most 'sec' seconds */ |
2804 | void |
2805 | ptimeout_deadline_sec(struct timespec *pt, long sec) |
2806 | { |
2807 | if (pt->tv_sec == -1 || pt->tv_sec >= sec) { |
2808 | pt->tv_sec = sec; |
2809 | pt->tv_nsec = 0; |
2810 | } |
2811 | } |
2812 | |
2813 | /* Specify a poll/ppoll deadline of at most 'p' (timespec) */ |
2814 | static void |
2815 | ptimeout_deadline_tsp(struct timespec *pt, struct timespec *p) |
2816 | { |
2817 | if (pt->tv_sec == -1 || timespeccmp(pt, p, >=)(((pt)->tv_sec == (p)->tv_sec) ? ((pt)->tv_nsec >= (p)->tv_nsec) : ((pt)->tv_sec >= (p)->tv_sec))) |
2818 | *pt = *p; |
2819 | } |
2820 | |
2821 | /* Specify a poll/ppoll deadline of at most 'ms' milliseconds */ |
2822 | void |
2823 | ptimeout_deadline_ms(struct timespec *pt, long ms) |
2824 | { |
2825 | struct timespec p; |
2826 | |
2827 | p.tv_sec = ms / 1000; |
2828 | p.tv_nsec = (ms % 1000) * 1000000; |
2829 | ptimeout_deadline_tsp(pt, &p); |
2830 | } |
2831 | |
2832 | /* Specify a poll/ppoll deadline at wall clock monotime 'when' (timespec) */ |
2833 | void |
2834 | ptimeout_deadline_monotime_tsp(struct timespec *pt, struct timespec *when) |
2835 | { |
2836 | struct timespec now, t; |
2837 | |
2838 | monotime_ts(&now); |
2839 | |
2840 | if (timespeccmp(&now, when, >=)(((&now)->tv_sec == (when)->tv_sec) ? ((&now)-> tv_nsec >= (when)->tv_nsec) : ((&now)->tv_sec >= (when)->tv_sec))) { |
2841 | /* 'when' is now or in the past. Timeout ASAP */ |
2842 | pt->tv_sec = 0; |
2843 | pt->tv_nsec = 0; |
2844 | } else { |
2845 | timespecsub(when, &now, &t)do { (&t)->tv_sec = (when)->tv_sec - (&now)-> tv_sec; (&t)->tv_nsec = (when)->tv_nsec - (&now )->tv_nsec; if ((&t)->tv_nsec < 0) { (&t)-> tv_sec--; (&t)->tv_nsec += 1000000000L; } } while (0); |
2846 | ptimeout_deadline_tsp(pt, &t); |
2847 | } |
2848 | } |
2849 | |
2850 | /* Specify a poll/ppoll deadline at wall clock monotime 'when' */ |
2851 | void |
2852 | ptimeout_deadline_monotime(struct timespec *pt, time_t when) |
2853 | { |
2854 | struct timespec t; |
2855 | |
2856 | t.tv_sec = when; |
2857 | t.tv_nsec = 0; |
2858 | ptimeout_deadline_monotime_tsp(pt, &t); |
2859 | } |
2860 | |
2861 | /* Get a poll(2) timeout value in milliseconds */ |
2862 | int |
2863 | ptimeout_get_ms(struct timespec *pt) |
2864 | { |
2865 | if (pt->tv_sec == -1) |
2866 | return -1; |
2867 | if (pt->tv_sec >= (INT_MAX0x7fffffff - (pt->tv_nsec / 1000000)) / 1000) |
2868 | return INT_MAX0x7fffffff; |
2869 | return (pt->tv_sec * 1000) + (pt->tv_nsec / 1000000); |
2870 | } |
2871 | |
2872 | /* Get a ppoll(2) timeout value as a timespec pointer */ |
2873 | struct timespec * |
2874 | ptimeout_get_tsp(struct timespec *pt) |
2875 | { |
2876 | return pt->tv_sec == -1 ? NULL((void *)0) : pt; |
2877 | } |
2878 | |
2879 | /* Returns non-zero if a timeout has been set (i.e. is not indefinite) */ |
2880 | int |
2881 | ptimeout_isset(struct timespec *pt) |
2882 | { |
2883 | return pt->tv_sec != -1; |
2884 | } |
2885 | |
2886 | /* |
2887 | * Returns zero if the library at 'path' contains symbol 's', nonzero |
2888 | * otherwise. |
2889 | */ |
2890 | int |
2891 | lib_contains_symbol(const char *path, const char *s) |
2892 | { |
2893 | struct nlist nl[2]; |
2894 | int ret = -1, r; |
2895 | |
2896 | memset(nl, 0, sizeof(nl)); |
2897 | nl[0].n_name = xstrdup(s); |
2898 | nl[1].n_name = NULL((void *)0); |
2899 | if ((r = nlist(path, nl)) == -1) { |
2900 | error_f("nlist failed for %s", path)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2900, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "nlist failed for %s", path ); |
2901 | goto out; |
2902 | } |
2903 | if (r != 0 || nl[0].n_value == 0 || nl[0].n_type == 0) { |
2904 | error_f("library %s does not contain symbol %s", path, s)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2904, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "library %s does not contain symbol %s" , path, s); |
2905 | goto out; |
2906 | } |
2907 | /* success */ |
2908 | ret = 0; |
2909 | out: |
2910 | free(nl[0].n_name); |
2911 | return ret; |
2912 | } |