File: | src/usr.bin/ssh/ssh/../misc.c |
Warning: | line 1969, column 4 Value stored to 'r' is never read |
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1 | /* $OpenBSD: misc.c,v 1.172 2022/01/08 07:32:45 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 <poll.h> |
44 | #include <signal.h> |
45 | #include <stdarg.h> |
46 | #include <stdio.h> |
47 | #include <stdlib.h> |
48 | #include <string.h> |
49 | #include <unistd.h> |
50 | |
51 | #include "xmalloc.h" |
52 | #include "misc.h" |
53 | #include "log.h" |
54 | #include "ssh.h" |
55 | #include "sshbuf.h" |
56 | #include "ssherr.h" |
57 | |
58 | /* remove newline at end of string */ |
59 | char * |
60 | chop(char *s) |
61 | { |
62 | char *t = s; |
63 | while (*t) { |
64 | if (*t == '\n' || *t == '\r') { |
65 | *t = '\0'; |
66 | return s; |
67 | } |
68 | t++; |
69 | } |
70 | return s; |
71 | |
72 | } |
73 | |
74 | /* remove whitespace from end of string */ |
75 | void |
76 | rtrim(char *s) |
77 | { |
78 | size_t i; |
79 | |
80 | if ((i = strlen(s)) == 0) |
81 | return; |
82 | for (i--; i > 0; i--) { |
83 | if (isspace((int)s[i])) |
84 | s[i] = '\0'; |
85 | } |
86 | } |
87 | |
88 | /* set/unset filedescriptor to non-blocking */ |
89 | int |
90 | set_nonblock(int fd) |
91 | { |
92 | int val; |
93 | |
94 | val = fcntl(fd, F_GETFL3); |
95 | if (val == -1) { |
96 | error("fcntl(%d, F_GETFL): %s", fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 96, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "fcntl(%d, F_GETFL): %s", fd , strerror((*__errno()))); |
97 | return (-1); |
98 | } |
99 | if (val & O_NONBLOCK0x0004) { |
100 | debug3("fd %d is O_NONBLOCK", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 100, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "fd %d is O_NONBLOCK", fd ); |
101 | return (0); |
102 | } |
103 | debug2("fd %d setting O_NONBLOCK", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 103, 0 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "fd %d setting O_NONBLOCK" , fd); |
104 | val |= O_NONBLOCK0x0004; |
105 | if (fcntl(fd, F_SETFL4, val) == -1) { |
106 | debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 107, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "fcntl(%d, F_SETFL, O_NONBLOCK): %s" , fd, strerror((*__errno()))) |
107 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 107, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "fcntl(%d, F_SETFL, O_NONBLOCK): %s" , fd, strerror((*__errno()))); |
108 | return (-1); |
109 | } |
110 | return (0); |
111 | } |
112 | |
113 | int |
114 | unset_nonblock(int fd) |
115 | { |
116 | int val; |
117 | |
118 | val = fcntl(fd, F_GETFL3); |
119 | if (val == -1) { |
120 | error("fcntl(%d, F_GETFL): %s", fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 120, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "fcntl(%d, F_GETFL): %s", fd , strerror((*__errno()))); |
121 | return (-1); |
122 | } |
123 | if (!(val & O_NONBLOCK0x0004)) { |
124 | debug3("fd %d is not O_NONBLOCK", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 124, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "fd %d is not O_NONBLOCK" , fd); |
125 | return (0); |
126 | } |
127 | debug("fd %d clearing O_NONBLOCK", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 127, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "fd %d clearing O_NONBLOCK" , fd); |
128 | val &= ~O_NONBLOCK0x0004; |
129 | if (fcntl(fd, F_SETFL4, val) == -1) { |
130 | debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 131, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "fcntl(%d, F_SETFL, ~O_NONBLOCK): %s" , fd, strerror((*__errno()))) |
131 | fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 131, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "fcntl(%d, F_SETFL, ~O_NONBLOCK): %s" , fd, strerror((*__errno()))); |
132 | return (-1); |
133 | } |
134 | return (0); |
135 | } |
136 | |
137 | const char * |
138 | ssh_gai_strerror(int gaierr) |
139 | { |
140 | if (gaierr == EAI_SYSTEM-11 && errno(*__errno()) != 0) |
141 | return strerror(errno(*__errno())); |
142 | return gai_strerror(gaierr); |
143 | } |
144 | |
145 | /* disable nagle on socket */ |
146 | void |
147 | set_nodelay(int fd) |
148 | { |
149 | int opt; |
150 | socklen_t optlen; |
151 | |
152 | optlen = sizeof opt; |
153 | if (getsockopt(fd, IPPROTO_TCP6, TCP_NODELAY0x01, &opt, &optlen) == -1) { |
154 | debug("getsockopt TCP_NODELAY: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 154, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "getsockopt TCP_NODELAY: %.100s" , strerror((*__errno()))); |
155 | return; |
156 | } |
157 | if (opt == 1) { |
158 | debug2("fd %d is TCP_NODELAY", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 158, 0 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "fd %d is TCP_NODELAY", fd ); |
159 | return; |
160 | } |
161 | opt = 1; |
162 | debug2("fd %d setting TCP_NODELAY", fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 162, 0 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "fd %d setting TCP_NODELAY" , fd); |
163 | if (setsockopt(fd, IPPROTO_TCP6, TCP_NODELAY0x01, &opt, sizeof opt) == -1) |
164 | error("setsockopt TCP_NODELAY: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 164, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt TCP_NODELAY: %.100s" , strerror((*__errno()))); |
165 | } |
166 | |
167 | /* Allow local port reuse in TIME_WAIT */ |
168 | int |
169 | set_reuseaddr(int fd) |
170 | { |
171 | int on = 1; |
172 | |
173 | if (setsockopt(fd, SOL_SOCKET0xffff, SO_REUSEADDR0x0004, &on, sizeof(on)) == -1) { |
174 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 174, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt SO_REUSEADDR fd %d: %s" , fd, strerror((*__errno()))); |
175 | return -1; |
176 | } |
177 | return 0; |
178 | } |
179 | |
180 | /* Get/set routing domain */ |
181 | char * |
182 | get_rdomain(int fd) |
183 | { |
184 | int rtable; |
185 | char *ret; |
186 | socklen_t len = sizeof(rtable); |
187 | |
188 | if (getsockopt(fd, SOL_SOCKET0xffff, SO_RTABLE0x1021, &rtable, &len) == -1) { |
189 | error("Failed to get routing domain for fd %d: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 190, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Failed to get routing domain for fd %d: %s" , fd, strerror((*__errno()))) |
190 | fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 190, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Failed to get routing domain for fd %d: %s" , fd, strerror((*__errno()))); |
191 | return NULL((void *)0); |
192 | } |
193 | xasprintf(&ret, "%d", rtable); |
194 | return ret; |
195 | } |
196 | |
197 | int |
198 | set_rdomain(int fd, const char *name) |
199 | { |
200 | int rtable; |
201 | const char *errstr; |
202 | |
203 | if (name == NULL((void *)0)) |
204 | return 0; /* default table */ |
205 | |
206 | rtable = (int)strtonum(name, 0, 255, &errstr); |
207 | if (errstr != NULL((void *)0)) { |
208 | /* Shouldn't happen */ |
209 | error("Invalid routing domain \"%s\": %s", name, errstr)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 209, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Invalid routing domain \"%s\": %s" , name, errstr); |
210 | return -1; |
211 | } |
212 | if (setsockopt(fd, SOL_SOCKET0xffff, SO_RTABLE0x1021, |
213 | &rtable, sizeof(rtable)) == -1) { |
214 | error("Failed to set routing domain %d on fd %d: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 215, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Failed to set routing domain %d on fd %d: %s" , rtable, fd, strerror((*__errno()))) |
215 | rtable, fd, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 215, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Failed to set routing domain %d on fd %d: %s" , rtable, fd, strerror((*__errno()))); |
216 | return -1; |
217 | } |
218 | return 0; |
219 | } |
220 | |
221 | int |
222 | get_sock_af(int fd) |
223 | { |
224 | struct sockaddr_storage to; |
225 | socklen_t tolen = sizeof(to); |
226 | |
227 | memset(&to, 0, sizeof(to)); |
228 | if (getsockname(fd, (struct sockaddr *)&to, &tolen) == -1) |
229 | return -1; |
230 | return to.ss_family; |
231 | } |
232 | |
233 | void |
234 | set_sock_tos(int fd, int tos) |
235 | { |
236 | int af; |
237 | |
238 | switch ((af = get_sock_af(fd))) { |
239 | case -1: |
240 | /* assume not a socket */ |
241 | break; |
242 | case AF_INET2: |
243 | debug3_f("set socket %d IP_TOS 0x%02x", fd, tos)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 243, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "set socket %d IP_TOS 0x%02x" , fd, tos); |
244 | if (setsockopt(fd, IPPROTO_IP0, IP_TOS3, |
245 | &tos, sizeof(tos)) == -1) { |
246 | error("setsockopt socket %d IP_TOS %d: %s:",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 247, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt socket %d IP_TOS %d: %s:" , fd, tos, strerror((*__errno()))) |
247 | fd, tos, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 247, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt socket %d IP_TOS %d: %s:" , fd, tos, strerror((*__errno()))); |
248 | } |
249 | break; |
250 | case AF_INET624: |
251 | debug3_f("set socket %d IPV6_TCLASS 0x%02x", fd, tos)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 251, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "set socket %d IPV6_TCLASS 0x%02x" , fd, tos); |
252 | if (setsockopt(fd, IPPROTO_IPV641, IPV6_TCLASS61, |
253 | &tos, sizeof(tos)) == -1) { |
254 | error("setsockopt socket %d IPV6_TCLASS %d: %.100s:",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 255, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt socket %d IPV6_TCLASS %d: %.100s:" , fd, tos, strerror((*__errno()))) |
255 | fd, tos, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 255, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt socket %d IPV6_TCLASS %d: %.100s:" , fd, tos, strerror((*__errno()))); |
256 | } |
257 | break; |
258 | default: |
259 | debug2_f("unsupported socket family %d", af)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 259, 1 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "unsupported socket family %d" , af); |
260 | break; |
261 | } |
262 | } |
263 | |
264 | /* |
265 | * Wait up to *timeoutp milliseconds for events on fd. Updates |
266 | * *timeoutp with time remaining. |
267 | * Returns 0 if fd ready or -1 on timeout or error (see errno). |
268 | */ |
269 | static int |
270 | waitfd(int fd, int *timeoutp, short events) |
271 | { |
272 | struct pollfd pfd; |
273 | struct timeval t_start; |
274 | int oerrno, r; |
275 | |
276 | pfd.fd = fd; |
277 | pfd.events = events; |
278 | for (; *timeoutp >= 0;) { |
279 | monotime_tv(&t_start); |
280 | r = poll(&pfd, 1, *timeoutp); |
281 | oerrno = errno(*__errno()); |
282 | ms_subtract_diff(&t_start, timeoutp); |
283 | errno(*__errno()) = oerrno; |
284 | if (r > 0) |
285 | return 0; |
286 | else if (r == -1 && errno(*__errno()) != EAGAIN35 && errno(*__errno()) != EINTR4) |
287 | return -1; |
288 | else if (r == 0) |
289 | break; |
290 | } |
291 | /* timeout */ |
292 | errno(*__errno()) = ETIMEDOUT60; |
293 | return -1; |
294 | } |
295 | |
296 | /* |
297 | * Wait up to *timeoutp milliseconds for fd to be readable. Updates |
298 | * *timeoutp with time remaining. |
299 | * Returns 0 if fd ready or -1 on timeout or error (see errno). |
300 | */ |
301 | int |
302 | waitrfd(int fd, int *timeoutp) { |
303 | return waitfd(fd, timeoutp, POLLIN0x0001); |
304 | } |
305 | |
306 | /* |
307 | * Attempt a non-blocking connect(2) to the specified address, waiting up to |
308 | * *timeoutp milliseconds for the connection to complete. If the timeout is |
309 | * <=0, then wait indefinitely. |
310 | * |
311 | * Returns 0 on success or -1 on failure. |
312 | */ |
313 | int |
314 | timeout_connect(int sockfd, const struct sockaddr *serv_addr, |
315 | socklen_t addrlen, int *timeoutp) |
316 | { |
317 | int optval = 0; |
318 | socklen_t optlen = sizeof(optval); |
319 | |
320 | /* No timeout: just do a blocking connect() */ |
321 | if (timeoutp == NULL((void *)0) || *timeoutp <= 0) |
322 | return connect(sockfd, serv_addr, addrlen); |
323 | |
324 | set_nonblock(sockfd); |
325 | for (;;) { |
326 | if (connect(sockfd, serv_addr, addrlen) == 0) { |
327 | /* Succeeded already? */ |
328 | unset_nonblock(sockfd); |
329 | return 0; |
330 | } else if (errno(*__errno()) == EINTR4) |
331 | continue; |
332 | else if (errno(*__errno()) != EINPROGRESS36) |
333 | return -1; |
334 | break; |
335 | } |
336 | |
337 | if (waitfd(sockfd, timeoutp, POLLIN0x0001 | POLLOUT0x0004) == -1) |
338 | return -1; |
339 | |
340 | /* Completed or failed */ |
341 | if (getsockopt(sockfd, SOL_SOCKET0xffff, SO_ERROR0x1007, &optval, &optlen) == -1) { |
342 | debug("getsockopt: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 342, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "getsockopt: %s", strerror ((*__errno()))); |
343 | return -1; |
344 | } |
345 | if (optval != 0) { |
346 | errno(*__errno()) = optval; |
347 | return -1; |
348 | } |
349 | unset_nonblock(sockfd); |
350 | return 0; |
351 | } |
352 | |
353 | /* Characters considered whitespace in strsep calls. */ |
354 | #define WHITESPACE" \t\r\n" " \t\r\n" |
355 | #define QUOTE"\"" "\"" |
356 | |
357 | /* return next token in configuration line */ |
358 | static char * |
359 | strdelim_internal(char **s, int split_equals) |
360 | { |
361 | char *old; |
362 | int wspace = 0; |
363 | |
364 | if (*s == NULL((void *)0)) |
365 | return NULL((void *)0); |
366 | |
367 | old = *s; |
368 | |
369 | *s = strpbrk(*s, |
370 | split_equals ? WHITESPACE" \t\r\n" QUOTE"\"" "=" : WHITESPACE" \t\r\n" QUOTE"\""); |
371 | if (*s == NULL((void *)0)) |
372 | return (old); |
373 | |
374 | if (*s[0] == '\"') { |
375 | memmove(*s, *s + 1, strlen(*s)); /* move nul too */ |
376 | /* Find matching quote */ |
377 | if ((*s = strpbrk(*s, QUOTE"\"")) == NULL((void *)0)) { |
378 | return (NULL((void *)0)); /* no matching quote */ |
379 | } else { |
380 | *s[0] = '\0'; |
381 | *s += strspn(*s + 1, WHITESPACE" \t\r\n") + 1; |
382 | return (old); |
383 | } |
384 | } |
385 | |
386 | /* Allow only one '=' to be skipped */ |
387 | if (split_equals && *s[0] == '=') |
388 | wspace = 1; |
389 | *s[0] = '\0'; |
390 | |
391 | /* Skip any extra whitespace after first token */ |
392 | *s += strspn(*s + 1, WHITESPACE" \t\r\n") + 1; |
393 | if (split_equals && *s[0] == '=' && !wspace) |
394 | *s += strspn(*s + 1, WHITESPACE" \t\r\n") + 1; |
395 | |
396 | return (old); |
397 | } |
398 | |
399 | /* |
400 | * Return next token in configuration line; splts on whitespace or a |
401 | * single '=' character. |
402 | */ |
403 | char * |
404 | strdelim(char **s) |
405 | { |
406 | return strdelim_internal(s, 1); |
407 | } |
408 | |
409 | /* |
410 | * Return next token in configuration line; splts on whitespace only. |
411 | */ |
412 | char * |
413 | strdelimw(char **s) |
414 | { |
415 | return strdelim_internal(s, 0); |
416 | } |
417 | |
418 | struct passwd * |
419 | pwcopy(struct passwd *pw) |
420 | { |
421 | struct passwd *copy = xcalloc(1, sizeof(*copy)); |
422 | |
423 | copy->pw_name = xstrdup(pw->pw_name); |
424 | copy->pw_passwd = xstrdup(pw->pw_passwd); |
425 | copy->pw_gecos = xstrdup(pw->pw_gecos); |
426 | copy->pw_uid = pw->pw_uid; |
427 | copy->pw_gid = pw->pw_gid; |
428 | copy->pw_expire = pw->pw_expire; |
429 | copy->pw_change = pw->pw_change; |
430 | copy->pw_class = xstrdup(pw->pw_class); |
431 | copy->pw_dir = xstrdup(pw->pw_dir); |
432 | copy->pw_shell = xstrdup(pw->pw_shell); |
433 | return copy; |
434 | } |
435 | |
436 | /* |
437 | * Convert ASCII string to TCP/IP port number. |
438 | * Port must be >=0 and <=65535. |
439 | * Return -1 if invalid. |
440 | */ |
441 | int |
442 | a2port(const char *s) |
443 | { |
444 | struct servent *se; |
445 | long long port; |
446 | const char *errstr; |
447 | |
448 | port = strtonum(s, 0, 65535, &errstr); |
449 | if (errstr == NULL((void *)0)) |
450 | return (int)port; |
451 | if ((se = getservbyname(s, "tcp")) != NULL((void *)0)) |
452 | 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)); |
453 | return -1; |
454 | } |
455 | |
456 | int |
457 | a2tun(const char *s, int *remote) |
458 | { |
459 | const char *errstr = NULL((void *)0); |
460 | char *sp, *ep; |
461 | int tun; |
462 | |
463 | if (remote != NULL((void *)0)) { |
464 | *remote = SSH_TUNID_ANY0x7fffffff; |
465 | sp = xstrdup(s); |
466 | if ((ep = strchr(sp, ':')) == NULL((void *)0)) { |
467 | free(sp); |
468 | return (a2tun(s, NULL((void *)0))); |
469 | } |
470 | ep[0] = '\0'; ep++; |
471 | *remote = a2tun(ep, NULL((void *)0)); |
472 | tun = a2tun(sp, NULL((void *)0)); |
473 | free(sp); |
474 | return (*remote == SSH_TUNID_ERR(0x7fffffff - 1) ? *remote : tun); |
475 | } |
476 | |
477 | if (strcasecmp(s, "any") == 0) |
478 | return (SSH_TUNID_ANY0x7fffffff); |
479 | |
480 | tun = strtonum(s, 0, SSH_TUNID_MAX(0x7fffffff - 2), &errstr); |
481 | if (errstr != NULL((void *)0)) |
482 | return (SSH_TUNID_ERR(0x7fffffff - 1)); |
483 | |
484 | return (tun); |
485 | } |
486 | |
487 | #define SECONDS1 1 |
488 | #define MINUTES(1 * 60) (SECONDS1 * 60) |
489 | #define HOURS((1 * 60) * 60) (MINUTES(1 * 60) * 60) |
490 | #define DAYS(((1 * 60) * 60) * 24) (HOURS((1 * 60) * 60) * 24) |
491 | #define WEEKS((((1 * 60) * 60) * 24) * 7) (DAYS(((1 * 60) * 60) * 24) * 7) |
492 | |
493 | /* |
494 | * Convert a time string into seconds; format is |
495 | * a sequence of: |
496 | * time[qualifier] |
497 | * |
498 | * Valid time qualifiers are: |
499 | * <none> seconds |
500 | * s|S seconds |
501 | * m|M minutes |
502 | * h|H hours |
503 | * d|D days |
504 | * w|W weeks |
505 | * |
506 | * Examples: |
507 | * 90m 90 minutes |
508 | * 1h30m 90 minutes |
509 | * 2d 2 days |
510 | * 1w 1 week |
511 | * |
512 | * Return -1 if time string is invalid. |
513 | */ |
514 | int |
515 | convtime(const char *s) |
516 | { |
517 | long total, secs, multiplier; |
518 | const char *p; |
519 | char *endp; |
520 | |
521 | errno(*__errno()) = 0; |
522 | total = 0; |
523 | p = s; |
524 | |
525 | if (p == NULL((void *)0) || *p == '\0') |
526 | return -1; |
527 | |
528 | while (*p) { |
529 | secs = strtol(p, &endp, 10); |
530 | if (p == endp || |
531 | (errno(*__errno()) == ERANGE34 && (secs == INT_MIN(-2147483647 -1) || secs == INT_MAX2147483647)) || |
532 | secs < 0) |
533 | return -1; |
534 | |
535 | multiplier = 1; |
536 | switch (*endp++) { |
537 | case '\0': |
538 | endp--; |
539 | break; |
540 | case 's': |
541 | case 'S': |
542 | break; |
543 | case 'm': |
544 | case 'M': |
545 | multiplier = MINUTES(1 * 60); |
546 | break; |
547 | case 'h': |
548 | case 'H': |
549 | multiplier = HOURS((1 * 60) * 60); |
550 | break; |
551 | case 'd': |
552 | case 'D': |
553 | multiplier = DAYS(((1 * 60) * 60) * 24); |
554 | break; |
555 | case 'w': |
556 | case 'W': |
557 | multiplier = WEEKS((((1 * 60) * 60) * 24) * 7); |
558 | break; |
559 | default: |
560 | return -1; |
561 | } |
562 | if (secs > INT_MAX2147483647 / multiplier) |
563 | return -1; |
564 | secs *= multiplier; |
565 | if (total > INT_MAX2147483647 - secs) |
566 | return -1; |
567 | total += secs; |
568 | if (total < 0) |
569 | return -1; |
570 | p = endp; |
571 | } |
572 | |
573 | return total; |
574 | } |
575 | |
576 | #define TF_BUFS8 8 |
577 | #define TF_LEN9 9 |
578 | |
579 | const char * |
580 | fmt_timeframe(time_t t) |
581 | { |
582 | char *buf; |
583 | static char tfbuf[TF_BUFS8][TF_LEN9]; /* ring buffer */ |
584 | static int idx = 0; |
585 | unsigned int sec, min, hrs, day; |
586 | unsigned long long week; |
587 | |
588 | buf = tfbuf[idx++]; |
589 | if (idx == TF_BUFS8) |
590 | idx = 0; |
591 | |
592 | week = t; |
593 | |
594 | sec = week % 60; |
595 | week /= 60; |
596 | min = week % 60; |
597 | week /= 60; |
598 | hrs = week % 24; |
599 | week /= 24; |
600 | day = week % 7; |
601 | week /= 7; |
602 | |
603 | if (week > 0) |
604 | snprintf(buf, TF_LEN9, "%02lluw%01ud%02uh", week, day, hrs); |
605 | else if (day > 0) |
606 | snprintf(buf, TF_LEN9, "%01ud%02uh%02um", day, hrs, min); |
607 | else |
608 | snprintf(buf, TF_LEN9, "%02u:%02u:%02u", hrs, min, sec); |
609 | |
610 | return (buf); |
611 | } |
612 | |
613 | /* |
614 | * Returns a standardized host+port identifier string. |
615 | * Caller must free returned string. |
616 | */ |
617 | char * |
618 | put_host_port(const char *host, u_short port) |
619 | { |
620 | char *hoststr; |
621 | |
622 | if (port == 0 || port == SSH_DEFAULT_PORT22) |
623 | return(xstrdup(host)); |
624 | if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1) |
625 | fatal("put_host_port: asprintf: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 625, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "put_host_port: asprintf: %s" , strerror((*__errno()))); |
626 | debug3("put_host_port: %s", hoststr)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 626, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "put_host_port: %s", hoststr ); |
627 | return hoststr; |
628 | } |
629 | |
630 | /* |
631 | * Search for next delimiter between hostnames/addresses and ports. |
632 | * Argument may be modified (for termination). |
633 | * Returns *cp if parsing succeeds. |
634 | * *cp is set to the start of the next field, if one was found. |
635 | * The delimiter char, if present, is stored in delim. |
636 | * If this is the last field, *cp is set to NULL. |
637 | */ |
638 | char * |
639 | hpdelim2(char **cp, char *delim) |
640 | { |
641 | char *s, *old; |
642 | |
643 | if (cp == NULL((void *)0) || *cp == NULL((void *)0)) |
644 | return NULL((void *)0); |
645 | |
646 | old = s = *cp; |
647 | if (*s == '[') { |
648 | if ((s = strchr(s, ']')) == NULL((void *)0)) |
649 | return NULL((void *)0); |
650 | else |
651 | s++; |
652 | } else if ((s = strpbrk(s, ":/")) == NULL((void *)0)) |
653 | s = *cp + strlen(*cp); /* skip to end (see first case below) */ |
654 | |
655 | switch (*s) { |
656 | case '\0': |
657 | *cp = NULL((void *)0); /* no more fields*/ |
658 | break; |
659 | |
660 | case ':': |
661 | case '/': |
662 | if (delim != NULL((void *)0)) |
663 | *delim = *s; |
664 | *s = '\0'; /* terminate */ |
665 | *cp = s + 1; |
666 | break; |
667 | |
668 | default: |
669 | return NULL((void *)0); |
670 | } |
671 | |
672 | return old; |
673 | } |
674 | |
675 | char * |
676 | hpdelim(char **cp) |
677 | { |
678 | return hpdelim2(cp, NULL((void *)0)); |
679 | } |
680 | |
681 | char * |
682 | cleanhostname(char *host) |
683 | { |
684 | if (*host == '[' && host[strlen(host) - 1] == ']') { |
685 | host[strlen(host) - 1] = '\0'; |
686 | return (host + 1); |
687 | } else |
688 | return host; |
689 | } |
690 | |
691 | char * |
692 | colon(char *cp) |
693 | { |
694 | int flag = 0; |
695 | |
696 | if (*cp == ':') /* Leading colon is part of file name. */ |
697 | return NULL((void *)0); |
698 | if (*cp == '[') |
699 | flag = 1; |
700 | |
701 | for (; *cp; ++cp) { |
702 | if (*cp == '@' && *(cp+1) == '[') |
703 | flag = 1; |
704 | if (*cp == ']' && *(cp+1) == ':' && flag) |
705 | return (cp+1); |
706 | if (*cp == ':' && !flag) |
707 | return (cp); |
708 | if (*cp == '/') |
709 | return NULL((void *)0); |
710 | } |
711 | return NULL((void *)0); |
712 | } |
713 | |
714 | /* |
715 | * Parse a [user@]host:[path] string. |
716 | * Caller must free returned user, host and path. |
717 | * Any of the pointer return arguments may be NULL (useful for syntax checking). |
718 | * If user was not specified then *userp will be set to NULL. |
719 | * If host was not specified then *hostp will be set to NULL. |
720 | * If path was not specified then *pathp will be set to ".". |
721 | * Returns 0 on success, -1 on failure. |
722 | */ |
723 | int |
724 | parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp) |
725 | { |
726 | char *user = NULL((void *)0), *host = NULL((void *)0), *path = NULL((void *)0); |
727 | char *sdup, *tmp; |
728 | int ret = -1; |
729 | |
730 | if (userp != NULL((void *)0)) |
731 | *userp = NULL((void *)0); |
732 | if (hostp != NULL((void *)0)) |
733 | *hostp = NULL((void *)0); |
734 | if (pathp != NULL((void *)0)) |
735 | *pathp = NULL((void *)0); |
736 | |
737 | sdup = xstrdup(s); |
738 | |
739 | /* Check for remote syntax: [user@]host:[path] */ |
740 | if ((tmp = colon(sdup)) == NULL((void *)0)) |
741 | goto out; |
742 | |
743 | /* Extract optional path */ |
744 | *tmp++ = '\0'; |
745 | if (*tmp == '\0') |
746 | tmp = "."; |
747 | path = xstrdup(tmp); |
748 | |
749 | /* Extract optional user and mandatory host */ |
750 | tmp = strrchr(sdup, '@'); |
751 | if (tmp != NULL((void *)0)) { |
752 | *tmp++ = '\0'; |
753 | host = xstrdup(cleanhostname(tmp)); |
754 | if (*sdup != '\0') |
755 | user = xstrdup(sdup); |
756 | } else { |
757 | host = xstrdup(cleanhostname(sdup)); |
758 | user = NULL((void *)0); |
759 | } |
760 | |
761 | /* Success */ |
762 | if (userp != NULL((void *)0)) { |
763 | *userp = user; |
764 | user = NULL((void *)0); |
765 | } |
766 | if (hostp != NULL((void *)0)) { |
767 | *hostp = host; |
768 | host = NULL((void *)0); |
769 | } |
770 | if (pathp != NULL((void *)0)) { |
771 | *pathp = path; |
772 | path = NULL((void *)0); |
773 | } |
774 | ret = 0; |
775 | out: |
776 | free(sdup); |
777 | free(user); |
778 | free(host); |
779 | free(path); |
780 | return ret; |
781 | } |
782 | |
783 | /* |
784 | * Parse a [user@]host[:port] string. |
785 | * Caller must free returned user and host. |
786 | * Any of the pointer return arguments may be NULL (useful for syntax checking). |
787 | * If user was not specified then *userp will be set to NULL. |
788 | * If port was not specified then *portp will be -1. |
789 | * Returns 0 on success, -1 on failure. |
790 | */ |
791 | int |
792 | parse_user_host_port(const char *s, char **userp, char **hostp, int *portp) |
793 | { |
794 | char *sdup, *cp, *tmp; |
795 | char *user = NULL((void *)0), *host = NULL((void *)0); |
796 | int port = -1, ret = -1; |
797 | |
798 | if (userp != NULL((void *)0)) |
799 | *userp = NULL((void *)0); |
800 | if (hostp != NULL((void *)0)) |
801 | *hostp = NULL((void *)0); |
802 | if (portp != NULL((void *)0)) |
803 | *portp = -1; |
804 | |
805 | if ((sdup = tmp = strdup(s)) == NULL((void *)0)) |
806 | return -1; |
807 | /* Extract optional username */ |
808 | if ((cp = strrchr(tmp, '@')) != NULL((void *)0)) { |
809 | *cp = '\0'; |
810 | if (*tmp == '\0') |
811 | goto out; |
812 | if ((user = strdup(tmp)) == NULL((void *)0)) |
813 | goto out; |
814 | tmp = cp + 1; |
815 | } |
816 | /* Extract mandatory hostname */ |
817 | if ((cp = hpdelim(&tmp)) == NULL((void *)0) || *cp == '\0') |
818 | goto out; |
819 | host = xstrdup(cleanhostname(cp)); |
820 | /* Convert and verify optional port */ |
821 | if (tmp != NULL((void *)0) && *tmp != '\0') { |
822 | if ((port = a2port(tmp)) <= 0) |
823 | goto out; |
824 | } |
825 | /* Success */ |
826 | if (userp != NULL((void *)0)) { |
827 | *userp = user; |
828 | user = NULL((void *)0); |
829 | } |
830 | if (hostp != NULL((void *)0)) { |
831 | *hostp = host; |
832 | host = NULL((void *)0); |
833 | } |
834 | if (portp != NULL((void *)0)) |
835 | *portp = port; |
836 | ret = 0; |
837 | out: |
838 | free(sdup); |
839 | free(user); |
840 | free(host); |
841 | return ret; |
842 | } |
843 | |
844 | /* |
845 | * Converts a two-byte hex string to decimal. |
846 | * Returns the decimal value or -1 for invalid input. |
847 | */ |
848 | static int |
849 | hexchar(const char *s) |
850 | { |
851 | unsigned char result[2]; |
852 | int i; |
853 | |
854 | for (i = 0; i < 2; i++) { |
855 | if (s[i] >= '0' && s[i] <= '9') |
856 | result[i] = (unsigned char)(s[i] - '0'); |
857 | else if (s[i] >= 'a' && s[i] <= 'f') |
858 | result[i] = (unsigned char)(s[i] - 'a') + 10; |
859 | else if (s[i] >= 'A' && s[i] <= 'F') |
860 | result[i] = (unsigned char)(s[i] - 'A') + 10; |
861 | else |
862 | return -1; |
863 | } |
864 | return (result[0] << 4) | result[1]; |
865 | } |
866 | |
867 | /* |
868 | * Decode an url-encoded string. |
869 | * Returns a newly allocated string on success or NULL on failure. |
870 | */ |
871 | static char * |
872 | urldecode(const char *src) |
873 | { |
874 | char *ret, *dst; |
875 | int ch; |
876 | |
877 | ret = xmalloc(strlen(src) + 1); |
878 | for (dst = ret; *src != '\0'; src++) { |
879 | switch (*src) { |
880 | case '+': |
881 | *dst++ = ' '; |
882 | break; |
883 | case '%': |
884 | if (!isxdigit((unsigned char)src[1]) || |
885 | !isxdigit((unsigned char)src[2]) || |
886 | (ch = hexchar(src + 1)) == -1) { |
887 | free(ret); |
888 | return NULL((void *)0); |
889 | } |
890 | *dst++ = ch; |
891 | src += 2; |
892 | break; |
893 | default: |
894 | *dst++ = *src; |
895 | break; |
896 | } |
897 | } |
898 | *dst = '\0'; |
899 | |
900 | return ret; |
901 | } |
902 | |
903 | /* |
904 | * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI. |
905 | * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04 |
906 | * Either user or path may be url-encoded (but not host or port). |
907 | * Caller must free returned user, host and path. |
908 | * Any of the pointer return arguments may be NULL (useful for syntax checking) |
909 | * but the scheme must always be specified. |
910 | * If user was not specified then *userp will be set to NULL. |
911 | * If port was not specified then *portp will be -1. |
912 | * If path was not specified then *pathp will be set to NULL. |
913 | * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri. |
914 | */ |
915 | int |
916 | parse_uri(const char *scheme, const char *uri, char **userp, char **hostp, |
917 | int *portp, char **pathp) |
918 | { |
919 | char *uridup, *cp, *tmp, ch; |
920 | char *user = NULL((void *)0), *host = NULL((void *)0), *path = NULL((void *)0); |
921 | int port = -1, ret = -1; |
922 | size_t len; |
923 | |
924 | len = strlen(scheme); |
925 | if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0) |
926 | return 1; |
927 | uri += len + 3; |
928 | |
929 | if (userp != NULL((void *)0)) |
930 | *userp = NULL((void *)0); |
931 | if (hostp != NULL((void *)0)) |
932 | *hostp = NULL((void *)0); |
933 | if (portp != NULL((void *)0)) |
934 | *portp = -1; |
935 | if (pathp != NULL((void *)0)) |
936 | *pathp = NULL((void *)0); |
937 | |
938 | uridup = tmp = xstrdup(uri); |
939 | |
940 | /* Extract optional ssh-info (username + connection params) */ |
941 | if ((cp = strchr(tmp, '@')) != NULL((void *)0)) { |
942 | char *delim; |
943 | |
944 | *cp = '\0'; |
945 | /* Extract username and connection params */ |
946 | if ((delim = strchr(tmp, ';')) != NULL((void *)0)) { |
947 | /* Just ignore connection params for now */ |
948 | *delim = '\0'; |
949 | } |
950 | if (*tmp == '\0') { |
951 | /* Empty username */ |
952 | goto out; |
953 | } |
954 | if ((user = urldecode(tmp)) == NULL((void *)0)) |
955 | goto out; |
956 | tmp = cp + 1; |
957 | } |
958 | |
959 | /* Extract mandatory hostname */ |
960 | if ((cp = hpdelim2(&tmp, &ch)) == NULL((void *)0) || *cp == '\0') |
961 | goto out; |
962 | host = xstrdup(cleanhostname(cp)); |
963 | if (!valid_domain(host, 0, NULL((void *)0))) |
964 | goto out; |
965 | |
966 | if (tmp != NULL((void *)0) && *tmp != '\0') { |
967 | if (ch == ':') { |
968 | /* Convert and verify port. */ |
969 | if ((cp = strchr(tmp, '/')) != NULL((void *)0)) |
970 | *cp = '\0'; |
971 | if ((port = a2port(tmp)) <= 0) |
972 | goto out; |
973 | tmp = cp ? cp + 1 : NULL((void *)0); |
974 | } |
975 | if (tmp != NULL((void *)0) && *tmp != '\0') { |
976 | /* Extract optional path */ |
977 | if ((path = urldecode(tmp)) == NULL((void *)0)) |
978 | goto out; |
979 | } |
980 | } |
981 | |
982 | /* Success */ |
983 | if (userp != NULL((void *)0)) { |
984 | *userp = user; |
985 | user = NULL((void *)0); |
986 | } |
987 | if (hostp != NULL((void *)0)) { |
988 | *hostp = host; |
989 | host = NULL((void *)0); |
990 | } |
991 | if (portp != NULL((void *)0)) |
992 | *portp = port; |
993 | if (pathp != NULL((void *)0)) { |
994 | *pathp = path; |
995 | path = NULL((void *)0); |
996 | } |
997 | ret = 0; |
998 | out: |
999 | free(uridup); |
1000 | free(user); |
1001 | free(host); |
1002 | free(path); |
1003 | return ret; |
1004 | } |
1005 | |
1006 | /* function to assist building execv() arguments */ |
1007 | void |
1008 | addargs(arglist *args, char *fmt, ...) |
1009 | { |
1010 | va_list ap; |
1011 | char *cp; |
1012 | u_int nalloc; |
1013 | int r; |
1014 | |
1015 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
1016 | r = vasprintf(&cp, fmt, ap); |
1017 | va_end(ap)__builtin_va_end(ap); |
1018 | if (r == -1) |
1019 | fatal("addargs: argument too long")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1019 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "addargs: argument too long" ); |
1020 | |
1021 | nalloc = args->nalloc; |
1022 | if (args->list == NULL((void *)0)) { |
1023 | nalloc = 32; |
1024 | args->num = 0; |
1025 | } else if (args->num+2 >= nalloc) |
1026 | nalloc *= 2; |
1027 | |
1028 | args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *)); |
1029 | args->nalloc = nalloc; |
1030 | args->list[args->num++] = cp; |
1031 | args->list[args->num] = NULL((void *)0); |
1032 | } |
1033 | |
1034 | void |
1035 | replacearg(arglist *args, u_int which, char *fmt, ...) |
1036 | { |
1037 | va_list ap; |
1038 | char *cp; |
1039 | int r; |
1040 | |
1041 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
1042 | r = vasprintf(&cp, fmt, ap); |
1043 | va_end(ap)__builtin_va_end(ap); |
1044 | if (r == -1) |
1045 | fatal("replacearg: argument too long")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1045 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "replacearg: argument too long" ); |
1046 | |
1047 | if (which >= args->num) |
1048 | fatal("replacearg: tried to replace invalid arg %d >= %d",sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1049 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "replacearg: tried to replace invalid arg %d >= %d" , which, args->num) |
1049 | which, args->num)sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1049 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "replacearg: tried to replace invalid arg %d >= %d" , which, args->num); |
1050 | free(args->list[which]); |
1051 | args->list[which] = cp; |
1052 | } |
1053 | |
1054 | void |
1055 | freeargs(arglist *args) |
1056 | { |
1057 | u_int i; |
1058 | |
1059 | if (args->list != NULL((void *)0)) { |
1060 | for (i = 0; i < args->num; i++) |
1061 | free(args->list[i]); |
1062 | free(args->list); |
1063 | args->nalloc = args->num = 0; |
1064 | args->list = NULL((void *)0); |
1065 | } |
1066 | } |
1067 | |
1068 | /* |
1069 | * Expands tildes in the file name. Returns data allocated by xmalloc. |
1070 | * Warning: this calls getpw*. |
1071 | */ |
1072 | int |
1073 | tilde_expand(const char *filename, uid_t uid, char **retp) |
1074 | { |
1075 | char *ocopy = NULL((void *)0), *copy, *s = NULL((void *)0); |
1076 | const char *path = NULL((void *)0), *user = NULL((void *)0); |
1077 | struct passwd *pw; |
1078 | size_t len; |
1079 | int ret = -1, r, slash; |
1080 | |
1081 | *retp = NULL((void *)0); |
1082 | if (*filename != '~') { |
1083 | *retp = xstrdup(filename); |
1084 | return 0; |
1085 | } |
1086 | ocopy = copy = xstrdup(filename + 1); |
1087 | |
1088 | if (*copy == '\0') /* ~ */ |
1089 | path = NULL((void *)0); |
1090 | else if (*copy == '/') { |
1091 | copy += strspn(copy, "/"); |
1092 | if (*copy == '\0') |
1093 | path = NULL((void *)0); /* ~/ */ |
1094 | else |
1095 | path = copy; /* ~/path */ |
1096 | } else { |
1097 | user = copy; |
1098 | if ((path = strchr(copy, '/')) != NULL((void *)0)) { |
1099 | copy[path - copy] = '\0'; |
1100 | path++; |
1101 | path += strspn(path, "/"); |
1102 | if (*path == '\0') /* ~user/ */ |
1103 | path = NULL((void *)0); |
1104 | /* else ~user/path */ |
1105 | } |
1106 | /* else ~user */ |
1107 | } |
1108 | if (user != NULL((void *)0)) { |
1109 | if ((pw = getpwnam(user)) == NULL((void *)0)) { |
1110 | error_f("No such user %s", user)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1110, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "No such user %s", user); |
1111 | goto out; |
1112 | } |
1113 | } else if ((pw = getpwuid(uid)) == NULL((void *)0)) { |
1114 | error_f("No such uid %ld", (long)uid)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1114, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "No such uid %ld", (long)uid ); |
1115 | goto out; |
1116 | } |
1117 | |
1118 | /* Make sure directory has a trailing '/' */ |
1119 | slash = (len = strlen(pw->pw_dir)) == 0 || pw->pw_dir[len - 1] != '/'; |
1120 | |
1121 | if ((r = xasprintf(&s, "%s%s%s", pw->pw_dir, |
1122 | slash ? "/" : "", path != NULL((void *)0) ? path : "")) <= 0) { |
1123 | error_f("xasprintf failed")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1123, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "xasprintf failed"); |
1124 | goto out; |
1125 | } |
1126 | if (r >= PATH_MAX1024) { |
1127 | error_f("Path too long")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1127, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "Path too long"); |
1128 | goto out; |
1129 | } |
1130 | /* success */ |
1131 | ret = 0; |
1132 | *retp = s; |
1133 | s = NULL((void *)0); |
1134 | out: |
1135 | free(s); |
1136 | free(ocopy); |
1137 | return ret; |
1138 | } |
1139 | |
1140 | char * |
1141 | tilde_expand_filename(const char *filename, uid_t uid) |
1142 | { |
1143 | char *ret; |
1144 | |
1145 | if (tilde_expand(filename, uid, &ret) != 0) |
1146 | cleanup_exit(255); |
1147 | return ret; |
1148 | } |
1149 | |
1150 | /* |
1151 | * Expand a string with a set of %[char] escapes and/or ${ENVIRONMENT} |
1152 | * substitutions. A number of escapes may be specified as |
1153 | * (char *escape_chars, char *replacement) pairs. The list must be terminated |
1154 | * by a NULL escape_char. Returns replaced string in memory allocated by |
1155 | * xmalloc which the caller must free. |
1156 | */ |
1157 | static char * |
1158 | vdollar_percent_expand(int *parseerror, int dollar, int percent, |
1159 | const char *string, va_list ap) |
1160 | { |
1161 | #define EXPAND_MAX_KEYS 16 |
1162 | u_int num_keys = 0, i; |
1163 | struct { |
1164 | const char *key; |
1165 | const char *repl; |
1166 | } keys[EXPAND_MAX_KEYS]; |
1167 | struct sshbuf *buf; |
1168 | int r, missingvar = 0; |
1169 | char *ret = NULL((void *)0), *var, *varend, *val; |
1170 | size_t len; |
1171 | |
1172 | if ((buf = sshbuf_new()) == NULL((void *)0)) |
1173 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1173 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed"); |
1174 | if (parseerror == NULL((void *)0)) |
1175 | fatal_f("null parseerror arg")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1175 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "null parseerror arg"); |
1176 | *parseerror = 1; |
1177 | |
1178 | /* Gather keys if we're doing percent expansion. */ |
1179 | if (percent) { |
1180 | for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { |
1181 | keys[num_keys].key = va_arg(ap, char *)__builtin_va_arg(ap, char *); |
1182 | if (keys[num_keys].key == NULL((void *)0)) |
1183 | break; |
1184 | keys[num_keys].repl = va_arg(ap, char *)__builtin_va_arg(ap, char *); |
1185 | if (keys[num_keys].repl == NULL((void *)0)) { |
1186 | fatal_f("NULL replacement for token %s",sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1187 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "NULL replacement for token %s" , keys[num_keys].key) |
1187 | keys[num_keys].key)sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1187 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "NULL replacement for token %s" , keys[num_keys].key); |
1188 | } |
1189 | } |
1190 | if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *)__builtin_va_arg(ap, char *) != NULL((void *)0)) |
1191 | fatal_f("too many keys")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1191 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "too many keys"); |
1192 | if (num_keys == 0) |
1193 | fatal_f("percent expansion without token list")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1193 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "percent expansion without token list" ); |
1194 | } |
1195 | |
1196 | /* Expand string */ |
1197 | for (i = 0; *string != '\0'; string++) { |
1198 | /* Optionally process ${ENVIRONMENT} expansions. */ |
1199 | if (dollar && string[0] == '$' && string[1] == '{') { |
1200 | string += 2; /* skip over '${' */ |
1201 | if ((varend = strchr(string, '}')) == NULL((void *)0)) { |
1202 | error_f("environment variable '%s' missing "sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1203, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "environment variable '%s' missing " "closing '}'", string) |
1203 | "closing '}'", string)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1203, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "environment variable '%s' missing " "closing '}'", string); |
1204 | goto out; |
1205 | } |
1206 | len = varend - string; |
1207 | if (len == 0) { |
1208 | error_f("zero-length environment variable")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1208, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "zero-length environment variable" ); |
1209 | goto out; |
1210 | } |
1211 | var = xmalloc(len + 1); |
1212 | (void)strlcpy(var, string, len + 1); |
1213 | if ((val = getenv(var)) == NULL((void *)0)) { |
1214 | error_f("env var ${%s} has no value", var)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1214, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "env var ${%s} has no value" , var); |
1215 | missingvar = 1; |
1216 | } else { |
1217 | debug3_f("expand ${%s} -> '%s'", var, val)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1217, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "expand ${%s} -> '%s'" , var, val); |
1218 | if ((r = sshbuf_put(buf, val, strlen(val))) !=0) |
1219 | fatal_fr(r, "sshbuf_put ${}")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1219 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put ${}"); |
1220 | } |
1221 | free(var); |
1222 | string += len; |
1223 | continue; |
1224 | } |
1225 | |
1226 | /* |
1227 | * Process percent expansions if we have a list of TOKENs. |
1228 | * If we're not doing percent expansion everything just gets |
1229 | * appended here. |
1230 | */ |
1231 | if (*string != '%' || !percent) { |
1232 | append: |
1233 | if ((r = sshbuf_put_u8(buf, *string)) != 0) |
1234 | fatal_fr(r, "sshbuf_put_u8 %%")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1234 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put_u8 %%"); |
1235 | continue; |
1236 | } |
1237 | string++; |
1238 | /* %% case */ |
1239 | if (*string == '%') |
1240 | goto append; |
1241 | if (*string == '\0') { |
1242 | error_f("invalid format")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1242, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "invalid format"); |
1243 | goto out; |
1244 | } |
1245 | for (i = 0; i < num_keys; i++) { |
1246 | if (strchr(keys[i].key, *string) != NULL((void *)0)) { |
1247 | if ((r = sshbuf_put(buf, keys[i].repl, |
1248 | strlen(keys[i].repl))) != 0) |
1249 | fatal_fr(r, "sshbuf_put %%-repl")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1249 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put %%-repl"); |
1250 | break; |
1251 | } |
1252 | } |
1253 | if (i >= num_keys) { |
1254 | error_f("unknown key %%%c", *string)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1254, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "unknown key %%%c", *string ); |
1255 | goto out; |
1256 | } |
1257 | } |
1258 | if (!missingvar && (ret = sshbuf_dup_string(buf)) == NULL((void *)0)) |
1259 | fatal_f("sshbuf_dup_string failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1259 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_dup_string failed" ); |
1260 | *parseerror = 0; |
1261 | out: |
1262 | sshbuf_free(buf); |
1263 | return *parseerror ? NULL((void *)0) : ret; |
1264 | #undef EXPAND_MAX_KEYS |
1265 | } |
1266 | |
1267 | /* |
1268 | * Expand only environment variables. |
1269 | * Note that although this function is variadic like the other similar |
1270 | * functions, any such arguments will be unused. |
1271 | */ |
1272 | |
1273 | char * |
1274 | dollar_expand(int *parseerr, const char *string, ...) |
1275 | { |
1276 | char *ret; |
1277 | int err; |
1278 | va_list ap; |
1279 | |
1280 | va_start(ap, string)__builtin_va_start(ap, string); |
1281 | ret = vdollar_percent_expand(&err, 1, 0, string, ap); |
1282 | va_end(ap)__builtin_va_end(ap); |
1283 | if (parseerr != NULL((void *)0)) |
1284 | *parseerr = err; |
1285 | return ret; |
1286 | } |
1287 | |
1288 | /* |
1289 | * Returns expanded string or NULL if a specified environment variable is |
1290 | * not defined, or calls fatal if the string is invalid. |
1291 | */ |
1292 | char * |
1293 | percent_expand(const char *string, ...) |
1294 | { |
1295 | char *ret; |
1296 | int err; |
1297 | va_list ap; |
1298 | |
1299 | va_start(ap, string)__builtin_va_start(ap, string); |
1300 | ret = vdollar_percent_expand(&err, 0, 1, string, ap); |
1301 | va_end(ap)__builtin_va_end(ap); |
1302 | if (err) |
1303 | fatal_f("failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1303 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "failed"); |
1304 | return ret; |
1305 | } |
1306 | |
1307 | /* |
1308 | * Returns expanded string or NULL if a specified environment variable is |
1309 | * not defined, or calls fatal if the string is invalid. |
1310 | */ |
1311 | char * |
1312 | percent_dollar_expand(const char *string, ...) |
1313 | { |
1314 | char *ret; |
1315 | int err; |
1316 | va_list ap; |
1317 | |
1318 | va_start(ap, string)__builtin_va_start(ap, string); |
1319 | ret = vdollar_percent_expand(&err, 1, 1, string, ap); |
1320 | va_end(ap)__builtin_va_end(ap); |
1321 | if (err) |
1322 | fatal_f("failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1322 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "failed"); |
1323 | return ret; |
1324 | } |
1325 | |
1326 | int |
1327 | tun_open(int tun, int mode, char **ifname) |
1328 | { |
1329 | struct ifreq ifr; |
1330 | char name[100]; |
1331 | int fd = -1, sock; |
1332 | const char *tunbase = "tun"; |
1333 | |
1334 | if (ifname != NULL((void *)0)) |
1335 | *ifname = NULL((void *)0); |
1336 | |
1337 | if (mode == SSH_TUNMODE_ETHERNET0x02) |
1338 | tunbase = "tap"; |
1339 | |
1340 | /* Open the tunnel device */ |
1341 | if (tun <= SSH_TUNID_MAX(0x7fffffff - 2)) { |
1342 | snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); |
1343 | fd = open(name, O_RDWR0x0002); |
1344 | } else if (tun == SSH_TUNID_ANY0x7fffffff) { |
1345 | for (tun = 100; tun >= 0; tun--) { |
1346 | snprintf(name, sizeof(name), "/dev/%s%d", |
1347 | tunbase, tun); |
1348 | if ((fd = open(name, O_RDWR0x0002)) >= 0) |
1349 | break; |
1350 | } |
1351 | } else { |
1352 | debug_f("invalid tunnel %u", tun)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1352, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "invalid tunnel %u", tun); |
1353 | return -1; |
1354 | } |
1355 | |
1356 | if (fd == -1) { |
1357 | debug_f("%s open: %s", name, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1357, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s open: %s", name, strerror ((*__errno()))); |
1358 | return -1; |
1359 | } |
1360 | |
1361 | debug_f("%s mode %d fd %d", name, mode, fd)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1361, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s mode %d fd %d", name, mode, fd); |
1362 | |
1363 | /* Bring interface up if it is not already */ |
1364 | snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); |
1365 | if ((sock = socket(PF_UNIX1, SOCK_STREAM1, 0)) == -1) |
1366 | goto failed; |
1367 | |
1368 | if (ioctl(sock, SIOCGIFFLAGS(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct ifreq) & 0x1fff) << 16) | ((('i')) << 8) | ((17))), &ifr) == -1) { |
1369 | debug_f("get interface %s flags: %s", ifr.ifr_name,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1370, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "get interface %s flags: %s" , ifr.ifr_name, strerror((*__errno()))) |
1370 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1370, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "get interface %s flags: %s" , ifr.ifr_name, strerror((*__errno()))); |
1371 | goto failed; |
1372 | } |
1373 | |
1374 | if (!(ifr.ifr_flagsifr_ifru.ifru_flags & IFF_UP0x1)) { |
1375 | ifr.ifr_flagsifr_ifru.ifru_flags |= IFF_UP0x1; |
1376 | if (ioctl(sock, SIOCSIFFLAGS((unsigned long)0x80000000 | ((sizeof(struct ifreq) & 0x1fff ) << 16) | ((('i')) << 8) | ((16))), &ifr) == -1) { |
1377 | debug_f("activate interface %s: %s", ifr.ifr_name,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1378, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "activate interface %s: %s" , ifr.ifr_name, strerror((*__errno()))) |
1378 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1378, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "activate interface %s: %s" , ifr.ifr_name, strerror((*__errno()))); |
1379 | goto failed; |
1380 | } |
1381 | } |
1382 | |
1383 | if (ifname != NULL((void *)0)) |
1384 | *ifname = xstrdup(ifr.ifr_name); |
1385 | |
1386 | close(sock); |
1387 | return fd; |
1388 | |
1389 | failed: |
1390 | if (fd >= 0) |
1391 | close(fd); |
1392 | if (sock >= 0) |
1393 | close(sock); |
1394 | return -1; |
1395 | } |
1396 | |
1397 | void |
1398 | sanitise_stdfd(void) |
1399 | { |
1400 | int nullfd, dupfd; |
1401 | |
1402 | if ((nullfd = dupfd = open(_PATH_DEVNULL"/dev/null", O_RDWR0x0002)) == -1) { |
1403 | fprintf(stderr(&__sF[2]), "Couldn't open /dev/null: %s\n", |
1404 | strerror(errno(*__errno()))); |
1405 | exit(1); |
1406 | } |
1407 | while (++dupfd <= STDERR_FILENO2) { |
1408 | /* Only populate closed fds. */ |
1409 | if (fcntl(dupfd, F_GETFL3) == -1 && errno(*__errno()) == EBADF9) { |
1410 | if (dup2(nullfd, dupfd) == -1) { |
1411 | fprintf(stderr(&__sF[2]), "dup2: %s\n", strerror(errno(*__errno()))); |
1412 | exit(1); |
1413 | } |
1414 | } |
1415 | } |
1416 | if (nullfd > STDERR_FILENO2) |
1417 | close(nullfd); |
1418 | } |
1419 | |
1420 | char * |
1421 | tohex(const void *vp, size_t l) |
1422 | { |
1423 | const u_char *p = (const u_char *)vp; |
1424 | char b[3], *r; |
1425 | size_t i, hl; |
1426 | |
1427 | if (l > 65536) |
1428 | return xstrdup("tohex: length > 65536"); |
1429 | |
1430 | hl = l * 2 + 1; |
1431 | r = xcalloc(1, hl); |
1432 | for (i = 0; i < l; i++) { |
1433 | snprintf(b, sizeof(b), "%02x", p[i]); |
1434 | strlcat(r, b, hl); |
1435 | } |
1436 | return (r); |
1437 | } |
1438 | |
1439 | /* |
1440 | * Extend string *sp by the specified format. If *sp is not NULL (or empty), |
1441 | * then the separator 'sep' will be prepended before the formatted arguments. |
1442 | * Extended strings are heap allocated. |
1443 | */ |
1444 | void |
1445 | xextendf(char **sp, const char *sep, const char *fmt, ...) |
1446 | { |
1447 | va_list ap; |
1448 | char *tmp1, *tmp2; |
1449 | |
1450 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
1451 | xvasprintf(&tmp1, fmt, ap); |
1452 | va_end(ap)__builtin_va_end(ap); |
1453 | |
1454 | if (*sp == NULL((void *)0) || **sp == '\0') { |
1455 | free(*sp); |
1456 | *sp = tmp1; |
1457 | return; |
1458 | } |
1459 | xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL((void *)0) ? "" : sep, tmp1); |
1460 | free(tmp1); |
1461 | free(*sp); |
1462 | *sp = tmp2; |
1463 | } |
1464 | |
1465 | |
1466 | u_int64_t |
1467 | get_u64(const void *vp) |
1468 | { |
1469 | const u_char *p = (const u_char *)vp; |
1470 | u_int64_t v; |
1471 | |
1472 | v = (u_int64_t)p[0] << 56; |
1473 | v |= (u_int64_t)p[1] << 48; |
1474 | v |= (u_int64_t)p[2] << 40; |
1475 | v |= (u_int64_t)p[3] << 32; |
1476 | v |= (u_int64_t)p[4] << 24; |
1477 | v |= (u_int64_t)p[5] << 16; |
1478 | v |= (u_int64_t)p[6] << 8; |
1479 | v |= (u_int64_t)p[7]; |
1480 | |
1481 | return (v); |
1482 | } |
1483 | |
1484 | u_int32_t |
1485 | get_u32(const void *vp) |
1486 | { |
1487 | const u_char *p = (const u_char *)vp; |
1488 | u_int32_t v; |
1489 | |
1490 | v = (u_int32_t)p[0] << 24; |
1491 | v |= (u_int32_t)p[1] << 16; |
1492 | v |= (u_int32_t)p[2] << 8; |
1493 | v |= (u_int32_t)p[3]; |
1494 | |
1495 | return (v); |
1496 | } |
1497 | |
1498 | u_int32_t |
1499 | get_u32_le(const void *vp) |
1500 | { |
1501 | const u_char *p = (const u_char *)vp; |
1502 | u_int32_t v; |
1503 | |
1504 | v = (u_int32_t)p[0]; |
1505 | v |= (u_int32_t)p[1] << 8; |
1506 | v |= (u_int32_t)p[2] << 16; |
1507 | v |= (u_int32_t)p[3] << 24; |
1508 | |
1509 | return (v); |
1510 | } |
1511 | |
1512 | u_int16_t |
1513 | get_u16(const void *vp) |
1514 | { |
1515 | const u_char *p = (const u_char *)vp; |
1516 | u_int16_t v; |
1517 | |
1518 | v = (u_int16_t)p[0] << 8; |
1519 | v |= (u_int16_t)p[1]; |
1520 | |
1521 | return (v); |
1522 | } |
1523 | |
1524 | void |
1525 | put_u64(void *vp, u_int64_t v) |
1526 | { |
1527 | u_char *p = (u_char *)vp; |
1528 | |
1529 | p[0] = (u_char)(v >> 56) & 0xff; |
1530 | p[1] = (u_char)(v >> 48) & 0xff; |
1531 | p[2] = (u_char)(v >> 40) & 0xff; |
1532 | p[3] = (u_char)(v >> 32) & 0xff; |
1533 | p[4] = (u_char)(v >> 24) & 0xff; |
1534 | p[5] = (u_char)(v >> 16) & 0xff; |
1535 | p[6] = (u_char)(v >> 8) & 0xff; |
1536 | p[7] = (u_char)v & 0xff; |
1537 | } |
1538 | |
1539 | void |
1540 | put_u32(void *vp, u_int32_t v) |
1541 | { |
1542 | u_char *p = (u_char *)vp; |
1543 | |
1544 | p[0] = (u_char)(v >> 24) & 0xff; |
1545 | p[1] = (u_char)(v >> 16) & 0xff; |
1546 | p[2] = (u_char)(v >> 8) & 0xff; |
1547 | p[3] = (u_char)v & 0xff; |
1548 | } |
1549 | |
1550 | void |
1551 | put_u32_le(void *vp, u_int32_t v) |
1552 | { |
1553 | u_char *p = (u_char *)vp; |
1554 | |
1555 | p[0] = (u_char)v & 0xff; |
1556 | p[1] = (u_char)(v >> 8) & 0xff; |
1557 | p[2] = (u_char)(v >> 16) & 0xff; |
1558 | p[3] = (u_char)(v >> 24) & 0xff; |
1559 | } |
1560 | |
1561 | void |
1562 | put_u16(void *vp, u_int16_t v) |
1563 | { |
1564 | u_char *p = (u_char *)vp; |
1565 | |
1566 | p[0] = (u_char)(v >> 8) & 0xff; |
1567 | p[1] = (u_char)v & 0xff; |
1568 | } |
1569 | |
1570 | void |
1571 | ms_subtract_diff(struct timeval *start, int *ms) |
1572 | { |
1573 | struct timeval diff, finish; |
1574 | |
1575 | monotime_tv(&finish); |
1576 | 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); |
1577 | *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); |
1578 | } |
1579 | |
1580 | void |
1581 | ms_to_timespec(struct timespec *ts, int ms) |
1582 | { |
1583 | if (ms < 0) |
1584 | ms = 0; |
1585 | ts->tv_sec = ms / 1000; |
1586 | ts->tv_nsec = (ms % 1000) * 1000 * 1000; |
1587 | } |
1588 | |
1589 | void |
1590 | monotime_ts(struct timespec *ts) |
1591 | { |
1592 | if (clock_gettime(CLOCK_MONOTONIC3, ts) != 0) |
1593 | fatal("clock_gettime: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1593 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "clock_gettime: %s", strerror ((*__errno()))); |
1594 | } |
1595 | |
1596 | void |
1597 | monotime_tv(struct timeval *tv) |
1598 | { |
1599 | struct timespec ts; |
1600 | |
1601 | monotime_ts(&ts); |
1602 | tv->tv_sec = ts.tv_sec; |
1603 | tv->tv_usec = ts.tv_nsec / 1000; |
1604 | } |
1605 | |
1606 | time_t |
1607 | monotime(void) |
1608 | { |
1609 | struct timespec ts; |
1610 | |
1611 | monotime_ts(&ts); |
1612 | return (ts.tv_sec); |
1613 | } |
1614 | |
1615 | double |
1616 | monotime_double(void) |
1617 | { |
1618 | struct timespec ts; |
1619 | |
1620 | monotime_ts(&ts); |
1621 | return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0; |
1622 | } |
1623 | |
1624 | void |
1625 | bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) |
1626 | { |
1627 | bw->buflen = buflen; |
1628 | bw->rate = kbps; |
1629 | bw->thresh = buflen; |
1630 | bw->lamt = 0; |
1631 | timerclear(&bw->bwstart)(&bw->bwstart)->tv_sec = (&bw->bwstart)-> tv_usec = 0; |
1632 | timerclear(&bw->bwend)(&bw->bwend)->tv_sec = (&bw->bwend)->tv_usec = 0; |
1633 | } |
1634 | |
1635 | /* Callback from read/write loop to insert bandwidth-limiting delays */ |
1636 | void |
1637 | bandwidth_limit(struct bwlimit *bw, size_t read_len) |
1638 | { |
1639 | u_int64_t waitlen; |
1640 | struct timespec ts, rm; |
1641 | |
1642 | bw->lamt += read_len; |
1643 | if (!timerisset(&bw->bwstart)((&bw->bwstart)->tv_sec || (&bw->bwstart)-> tv_usec)) { |
1644 | monotime_tv(&bw->bwstart); |
1645 | return; |
1646 | } |
1647 | if (bw->lamt < bw->thresh) |
1648 | return; |
1649 | |
1650 | monotime_tv(&bw->bwend); |
1651 | 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); |
1652 | if (!timerisset(&bw->bwend)((&bw->bwend)->tv_sec || (&bw->bwend)->tv_usec )) |
1653 | return; |
1654 | |
1655 | bw->lamt *= 8; |
1656 | waitlen = (double)1000000L * bw->lamt / bw->rate; |
1657 | |
1658 | bw->bwstart.tv_sec = waitlen / 1000000L; |
1659 | bw->bwstart.tv_usec = waitlen % 1000000L; |
1660 | |
1661 | 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))) { |
1662 | 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); |
1663 | |
1664 | /* Adjust the wait time */ |
1665 | if (bw->bwend.tv_sec) { |
1666 | bw->thresh /= 2; |
1667 | if (bw->thresh < bw->buflen / 4) |
1668 | bw->thresh = bw->buflen / 4; |
1669 | } else if (bw->bwend.tv_usec < 10000) { |
1670 | bw->thresh *= 2; |
1671 | if (bw->thresh > bw->buflen * 8) |
1672 | bw->thresh = bw->buflen * 8; |
1673 | } |
1674 | |
1675 | TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts)do { (&ts)->tv_sec = (&bw->bwend)->tv_sec; ( &ts)->tv_nsec = (&bw->bwend)->tv_usec * 1000 ; } while (0); |
1676 | while (nanosleep(&ts, &rm) == -1) { |
1677 | if (errno(*__errno()) != EINTR4) |
1678 | break; |
1679 | ts = rm; |
1680 | } |
1681 | } |
1682 | |
1683 | bw->lamt = 0; |
1684 | monotime_tv(&bw->bwstart); |
1685 | } |
1686 | |
1687 | /* Make a template filename for mk[sd]temp() */ |
1688 | void |
1689 | mktemp_proto(char *s, size_t len) |
1690 | { |
1691 | const char *tmpdir; |
1692 | int r; |
1693 | |
1694 | if ((tmpdir = getenv("TMPDIR")) != NULL((void *)0)) { |
1695 | r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); |
1696 | if (r > 0 && (size_t)r < len) |
1697 | return; |
1698 | } |
1699 | r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); |
1700 | if (r < 0 || (size_t)r >= len) |
1701 | fatal_f("template string too short")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1701 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "template string too short" ); |
1702 | } |
1703 | |
1704 | static const struct { |
1705 | const char *name; |
1706 | int value; |
1707 | } ipqos[] = { |
1708 | { "none", INT_MAX2147483647 }, /* can't use 0 here; that's CS0 */ |
1709 | { "af11", IPTOS_DSCP_AF110x28 }, |
1710 | { "af12", IPTOS_DSCP_AF120x30 }, |
1711 | { "af13", IPTOS_DSCP_AF130x38 }, |
1712 | { "af21", IPTOS_DSCP_AF210x48 }, |
1713 | { "af22", IPTOS_DSCP_AF220x50 }, |
1714 | { "af23", IPTOS_DSCP_AF230x58 }, |
1715 | { "af31", IPTOS_DSCP_AF310x68 }, |
1716 | { "af32", IPTOS_DSCP_AF320x70 }, |
1717 | { "af33", IPTOS_DSCP_AF330x78 }, |
1718 | { "af41", IPTOS_DSCP_AF410x88 }, |
1719 | { "af42", IPTOS_DSCP_AF420x90 }, |
1720 | { "af43", IPTOS_DSCP_AF430x98 }, |
1721 | { "cs0", IPTOS_DSCP_CS00x00 }, |
1722 | { "cs1", IPTOS_DSCP_CS10x20 }, |
1723 | { "cs2", IPTOS_DSCP_CS20x40 }, |
1724 | { "cs3", IPTOS_DSCP_CS30x60 }, |
1725 | { "cs4", IPTOS_DSCP_CS40x80 }, |
1726 | { "cs5", IPTOS_DSCP_CS50xa0 }, |
1727 | { "cs6", IPTOS_DSCP_CS60xc0 }, |
1728 | { "cs7", IPTOS_DSCP_CS70xe0 }, |
1729 | { "ef", IPTOS_DSCP_EF0xb8 }, |
1730 | { "le", IPTOS_DSCP_LE0x04 }, |
1731 | { "lowdelay", IPTOS_LOWDELAY0x10 }, |
1732 | { "throughput", IPTOS_THROUGHPUT0x08 }, |
1733 | { "reliability", IPTOS_RELIABILITY0x04 }, |
1734 | { NULL((void *)0), -1 } |
1735 | }; |
1736 | |
1737 | int |
1738 | parse_ipqos(const char *cp) |
1739 | { |
1740 | u_int i; |
1741 | char *ep; |
1742 | long val; |
1743 | |
1744 | if (cp == NULL((void *)0)) |
1745 | return -1; |
1746 | for (i = 0; ipqos[i].name != NULL((void *)0); i++) { |
1747 | if (strcasecmp(cp, ipqos[i].name) == 0) |
1748 | return ipqos[i].value; |
1749 | } |
1750 | /* Try parsing as an integer */ |
1751 | val = strtol(cp, &ep, 0); |
1752 | if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) |
1753 | return -1; |
1754 | return val; |
1755 | } |
1756 | |
1757 | const char * |
1758 | iptos2str(int iptos) |
1759 | { |
1760 | int i; |
1761 | static char iptos_str[sizeof "0xff"]; |
1762 | |
1763 | for (i = 0; ipqos[i].name != NULL((void *)0); i++) { |
1764 | if (ipqos[i].value == iptos) |
1765 | return ipqos[i].name; |
1766 | } |
1767 | snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); |
1768 | return iptos_str; |
1769 | } |
1770 | |
1771 | void |
1772 | lowercase(char *s) |
1773 | { |
1774 | for (; *s; s++) |
1775 | *s = tolower((u_char)*s); |
1776 | } |
1777 | |
1778 | int |
1779 | unix_listener(const char *path, int backlog, int unlink_first) |
1780 | { |
1781 | struct sockaddr_un sunaddr; |
1782 | int saved_errno, sock; |
1783 | |
1784 | memset(&sunaddr, 0, sizeof(sunaddr)); |
1785 | sunaddr.sun_family = AF_UNIX1; |
1786 | if (strlcpy(sunaddr.sun_path, path, |
1787 | sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { |
1788 | error_f("path \"%s\" too long for Unix domain socket", path)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1788, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "path \"%s\" too long for Unix domain socket" , path); |
1789 | errno(*__errno()) = ENAMETOOLONG63; |
1790 | return -1; |
1791 | } |
1792 | |
1793 | sock = socket(PF_UNIX1, SOCK_STREAM1, 0); |
1794 | if (sock == -1) { |
1795 | saved_errno = errno(*__errno()); |
1796 | error_f("socket: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1796, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "socket: %.100s", strerror ((*__errno()))); |
1797 | errno(*__errno()) = saved_errno; |
1798 | return -1; |
1799 | } |
1800 | if (unlink_first == 1) { |
1801 | if (unlink(path) != 0 && errno(*__errno()) != ENOENT2) |
1802 | error("unlink(%s): %.100s", path, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1802, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "unlink(%s): %.100s", path , strerror((*__errno()))); |
1803 | } |
1804 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) { |
1805 | saved_errno = errno(*__errno()); |
1806 | error_f("cannot bind to path %s: %s", path, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1806, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "cannot bind to path %s: %s" , path, strerror((*__errno()))); |
1807 | close(sock); |
1808 | errno(*__errno()) = saved_errno; |
1809 | return -1; |
1810 | } |
1811 | if (listen(sock, backlog) == -1) { |
1812 | saved_errno = errno(*__errno()); |
1813 | error_f("cannot listen on path %s: %s", path, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1813, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "cannot listen on path %s: %s" , path, strerror((*__errno()))); |
1814 | close(sock); |
1815 | unlink(path); |
1816 | errno(*__errno()) = saved_errno; |
1817 | return -1; |
1818 | } |
1819 | return sock; |
1820 | } |
1821 | |
1822 | /* |
1823 | * Compares two strings that maybe be NULL. Returns non-zero if strings |
1824 | * are both NULL or are identical, returns zero otherwise. |
1825 | */ |
1826 | static int |
1827 | strcmp_maybe_null(const char *a, const char *b) |
1828 | { |
1829 | if ((a == NULL((void *)0) && b != NULL((void *)0)) || (a != NULL((void *)0) && b == NULL((void *)0))) |
1830 | return 0; |
1831 | if (a != NULL((void *)0) && strcmp(a, b) != 0) |
1832 | return 0; |
1833 | return 1; |
1834 | } |
1835 | |
1836 | /* |
1837 | * Compare two forwards, returning non-zero if they are identical or |
1838 | * zero otherwise. |
1839 | */ |
1840 | int |
1841 | forward_equals(const struct Forward *a, const struct Forward *b) |
1842 | { |
1843 | if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0) |
1844 | return 0; |
1845 | if (a->listen_port != b->listen_port) |
1846 | return 0; |
1847 | if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0) |
1848 | return 0; |
1849 | if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0) |
1850 | return 0; |
1851 | if (a->connect_port != b->connect_port) |
1852 | return 0; |
1853 | if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0) |
1854 | return 0; |
1855 | /* allocated_port and handle are not checked */ |
1856 | return 1; |
1857 | } |
1858 | |
1859 | /* returns 1 if process is already daemonized, 0 otherwise */ |
1860 | int |
1861 | daemonized(void) |
1862 | { |
1863 | int fd; |
1864 | |
1865 | if ((fd = open(_PATH_TTY"/dev/tty", O_RDONLY0x0000 | O_NOCTTY0x8000)) >= 0) { |
1866 | close(fd); |
1867 | return 0; /* have controlling terminal */ |
1868 | } |
1869 | if (getppid() != 1) |
1870 | return 0; /* parent is not init */ |
1871 | if (getsid(0) != getpid()) |
1872 | return 0; /* not session leader */ |
1873 | debug3("already daemonized")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1873, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "already daemonized"); |
1874 | return 1; |
1875 | } |
1876 | |
1877 | /* |
1878 | * Splits 's' into an argument vector. Handles quoted string and basic |
1879 | * escape characters (\\, \", \'). Caller must free the argument vector |
1880 | * and its members. |
1881 | */ |
1882 | int |
1883 | argv_split(const char *s, int *argcp, char ***argvp, int terminate_on_comment) |
1884 | { |
1885 | int r = SSH_ERR_INTERNAL_ERROR-1; |
1886 | int argc = 0, quote, i, j; |
1887 | char *arg, **argv = xcalloc(1, sizeof(*argv)); |
1888 | |
1889 | *argvp = NULL((void *)0); |
1890 | *argcp = 0; |
1891 | |
1892 | for (i = 0; s[i] != '\0'; i++) { |
1893 | /* Skip leading whitespace */ |
1894 | if (s[i] == ' ' || s[i] == '\t') |
1895 | continue; |
1896 | if (terminate_on_comment && s[i] == '#') |
1897 | break; |
1898 | /* Start of a token */ |
1899 | quote = 0; |
1900 | |
1901 | argv = xreallocarray(argv, (argc + 2), sizeof(*argv)); |
1902 | arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1); |
1903 | argv[argc] = NULL((void *)0); |
1904 | |
1905 | /* Copy the token in, removing escapes */ |
1906 | for (j = 0; s[i] != '\0'; i++) { |
1907 | if (s[i] == '\\') { |
1908 | if (s[i + 1] == '\'' || |
1909 | s[i + 1] == '\"' || |
1910 | s[i + 1] == '\\' || |
1911 | (quote == 0 && s[i + 1] == ' ')) { |
1912 | i++; /* Skip '\' */ |
1913 | arg[j++] = s[i]; |
1914 | } else { |
1915 | /* Unrecognised escape */ |
1916 | arg[j++] = s[i]; |
1917 | } |
1918 | } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t')) |
1919 | break; /* done */ |
1920 | else if (quote == 0 && (s[i] == '\"' || s[i] == '\'')) |
1921 | quote = s[i]; /* quote start */ |
1922 | else if (quote != 0 && s[i] == quote) |
1923 | quote = 0; /* quote end */ |
1924 | else |
1925 | arg[j++] = s[i]; |
1926 | } |
1927 | if (s[i] == '\0') { |
1928 | if (quote != 0) { |
1929 | /* Ran out of string looking for close quote */ |
1930 | r = SSH_ERR_INVALID_FORMAT-4; |
1931 | goto out; |
1932 | } |
1933 | break; |
1934 | } |
1935 | } |
1936 | /* Success */ |
1937 | *argcp = argc; |
1938 | *argvp = argv; |
1939 | argc = 0; |
1940 | argv = NULL((void *)0); |
1941 | r = 0; |
1942 | out: |
1943 | if (argc != 0 && argv != NULL((void *)0)) { |
1944 | for (i = 0; i < argc; i++) |
1945 | free(argv[i]); |
1946 | free(argv); |
1947 | } |
1948 | return r; |
1949 | } |
1950 | |
1951 | /* |
1952 | * Reassemble an argument vector into a string, quoting and escaping as |
1953 | * necessary. Caller must free returned string. |
1954 | */ |
1955 | char * |
1956 | argv_assemble(int argc, char **argv) |
1957 | { |
1958 | int i, j, ws, r; |
1959 | char c, *ret; |
1960 | struct sshbuf *buf, *arg; |
1961 | |
1962 | if ((buf = sshbuf_new()) == NULL((void *)0) || (arg = sshbuf_new()) == NULL((void *)0)) |
1963 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1963 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed"); |
1964 | |
1965 | for (i = 0; i < argc; i++) { |
1966 | ws = 0; |
1967 | sshbuf_reset(arg); |
1968 | for (j = 0; argv[i][j] != '\0'; j++) { |
1969 | r = 0; |
Value stored to 'r' is never read | |
1970 | c = argv[i][j]; |
1971 | switch (c) { |
1972 | case ' ': |
1973 | case '\t': |
1974 | ws = 1; |
1975 | r = sshbuf_put_u8(arg, c); |
1976 | break; |
1977 | case '\\': |
1978 | case '\'': |
1979 | case '"': |
1980 | if ((r = sshbuf_put_u8(arg, '\\')) != 0) |
1981 | break; |
1982 | /* FALLTHROUGH */ |
1983 | default: |
1984 | r = sshbuf_put_u8(arg, c); |
1985 | break; |
1986 | } |
1987 | if (r != 0) |
1988 | fatal_fr(r, "sshbuf_put_u8")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1988 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put_u8"); |
1989 | } |
1990 | if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) || |
1991 | (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) || |
1992 | (r = sshbuf_putb(buf, arg)) != 0 || |
1993 | (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0)) |
1994 | fatal_fr(r, "assemble")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1994 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "assemble"); |
1995 | } |
1996 | if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL((void *)0)) |
1997 | fatal_f("malloc failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 1997 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "malloc failed"); |
1998 | memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf)); |
1999 | ret[sshbuf_len(buf)] = '\0'; |
2000 | sshbuf_free(buf); |
2001 | sshbuf_free(arg); |
2002 | return ret; |
2003 | } |
2004 | |
2005 | char * |
2006 | argv_next(int *argcp, char ***argvp) |
2007 | { |
2008 | char *ret = (*argvp)[0]; |
2009 | |
2010 | if (*argcp > 0 && ret != NULL((void *)0)) { |
2011 | (*argcp)--; |
2012 | (*argvp)++; |
2013 | } |
2014 | return ret; |
2015 | } |
2016 | |
2017 | void |
2018 | argv_consume(int *argcp) |
2019 | { |
2020 | *argcp = 0; |
2021 | } |
2022 | |
2023 | void |
2024 | argv_free(char **av, int ac) |
2025 | { |
2026 | int i; |
2027 | |
2028 | if (av == NULL((void *)0)) |
2029 | return; |
2030 | for (i = 0; i < ac; i++) |
2031 | free(av[i]); |
2032 | free(av); |
2033 | } |
2034 | |
2035 | /* Returns 0 if pid exited cleanly, non-zero otherwise */ |
2036 | int |
2037 | exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet) |
2038 | { |
2039 | int status; |
2040 | |
2041 | while (waitpid(pid, &status, 0) == -1) { |
2042 | if (errno(*__errno()) != EINTR4) { |
2043 | error("%s waitpid: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2043, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s waitpid: %s", tag, strerror ((*__errno()))); |
2044 | return -1; |
2045 | } |
2046 | } |
2047 | if (WIFSIGNALED(status)(((status) & 0177) != 0177 && ((status) & 0177 ) != 0)) { |
2048 | error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2048, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s %s exited on signal %d" , tag, cmd, (((status) & 0177))); |
2049 | return -1; |
2050 | } else if (WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) != 0) { |
2051 | do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2052, 0 , quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO, ((void *)0 ), "%s %s failed, status %d", tag, cmd, (int)(((unsigned)(status ) >> 8) & 0xff)) |
2052 | "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2052, 0 , quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO, ((void *)0 ), "%s %s failed, status %d", tag, cmd, (int)(((unsigned)(status ) >> 8) & 0xff)); |
2053 | return -1; |
2054 | } |
2055 | return 0; |
2056 | } |
2057 | |
2058 | /* |
2059 | * Check a given path for security. This is defined as all components |
2060 | * of the path to the file must be owned by either the owner of |
2061 | * of the file or root and no directories must be group or world writable. |
2062 | * |
2063 | * XXX Should any specific check be done for sym links ? |
2064 | * |
2065 | * Takes a file name, its stat information (preferably from fstat() to |
2066 | * avoid races), the uid of the expected owner, their home directory and an |
2067 | * error buffer plus max size as arguments. |
2068 | * |
2069 | * Returns 0 on success and -1 on failure |
2070 | */ |
2071 | int |
2072 | safe_path(const char *name, struct stat *stp, const char *pw_dir, |
2073 | uid_t uid, char *err, size_t errlen) |
2074 | { |
2075 | char buf[PATH_MAX1024], homedir[PATH_MAX1024]; |
2076 | char *cp; |
2077 | int comparehome = 0; |
2078 | struct stat st; |
2079 | |
2080 | if (realpath(name, buf) == NULL((void *)0)) { |
2081 | snprintf(err, errlen, "realpath %s failed: %s", name, |
2082 | strerror(errno(*__errno()))); |
2083 | return -1; |
2084 | } |
2085 | if (pw_dir != NULL((void *)0) && realpath(pw_dir, homedir) != NULL((void *)0)) |
2086 | comparehome = 1; |
2087 | |
2088 | if (!S_ISREG(stp->st_mode)((stp->st_mode & 0170000) == 0100000)) { |
2089 | snprintf(err, errlen, "%s is not a regular file", buf); |
2090 | return -1; |
2091 | } |
2092 | if ((stp->st_uid != 0 && stp->st_uid != uid) || |
2093 | (stp->st_mode & 022) != 0) { |
2094 | snprintf(err, errlen, "bad ownership or modes for file %s", |
2095 | buf); |
2096 | return -1; |
2097 | } |
2098 | |
2099 | /* for each component of the canonical path, walking upwards */ |
2100 | for (;;) { |
2101 | if ((cp = dirname(buf)) == NULL((void *)0)) { |
2102 | snprintf(err, errlen, "dirname() failed"); |
2103 | return -1; |
2104 | } |
2105 | strlcpy(buf, cp, sizeof(buf)); |
2106 | |
2107 | if (stat(buf, &st) == -1 || |
2108 | (st.st_uid != 0 && st.st_uid != uid) || |
2109 | (st.st_mode & 022) != 0) { |
2110 | snprintf(err, errlen, |
2111 | "bad ownership or modes for directory %s", buf); |
2112 | return -1; |
2113 | } |
2114 | |
2115 | /* If are past the homedir then we can stop */ |
2116 | if (comparehome && strcmp(homedir, buf) == 0) |
2117 | break; |
2118 | |
2119 | /* |
2120 | * dirname should always complete with a "/" path, |
2121 | * but we can be paranoid and check for "." too |
2122 | */ |
2123 | if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) |
2124 | break; |
2125 | } |
2126 | return 0; |
2127 | } |
2128 | |
2129 | /* |
2130 | * Version of safe_path() that accepts an open file descriptor to |
2131 | * avoid races. |
2132 | * |
2133 | * Returns 0 on success and -1 on failure |
2134 | */ |
2135 | int |
2136 | safe_path_fd(int fd, const char *file, struct passwd *pw, |
2137 | char *err, size_t errlen) |
2138 | { |
2139 | struct stat st; |
2140 | |
2141 | /* check the open file to avoid races */ |
2142 | if (fstat(fd, &st) == -1) { |
2143 | snprintf(err, errlen, "cannot stat file %s: %s", |
2144 | file, strerror(errno(*__errno()))); |
2145 | return -1; |
2146 | } |
2147 | return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); |
2148 | } |
2149 | |
2150 | /* |
2151 | * Sets the value of the given variable in the environment. If the variable |
2152 | * already exists, its value is overridden. |
2153 | */ |
2154 | void |
2155 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
2156 | const char *value) |
2157 | { |
2158 | char **env; |
2159 | u_int envsize; |
2160 | u_int i, namelen; |
2161 | |
2162 | if (strchr(name, '=') != NULL((void *)0)) { |
2163 | error("Invalid environment variable \"%.100s\"", name)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2163, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Invalid environment variable \"%.100s\"" , name); |
2164 | return; |
2165 | } |
2166 | |
2167 | /* |
2168 | * Find the slot where the value should be stored. If the variable |
2169 | * already exists, we reuse the slot; otherwise we append a new slot |
2170 | * at the end of the array, expanding if necessary. |
2171 | */ |
2172 | env = *envp; |
2173 | namelen = strlen(name); |
2174 | for (i = 0; env[i]; i++) |
2175 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') |
2176 | break; |
2177 | if (env[i]) { |
2178 | /* Reuse the slot. */ |
2179 | free(env[i]); |
2180 | } else { |
2181 | /* New variable. Expand if necessary. */ |
2182 | envsize = *envsizep; |
2183 | if (i >= envsize - 1) { |
2184 | if (envsize >= 1000) |
2185 | fatal("child_set_env: too many env vars")sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2185 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "child_set_env: too many env vars" ); |
2186 | envsize += 50; |
2187 | env = (*envp) = xreallocarray(env, envsize, sizeof(char *)); |
2188 | *envsizep = envsize; |
2189 | } |
2190 | /* Need to set the NULL pointer at end of array beyond the new slot. */ |
2191 | env[i + 1] = NULL((void *)0); |
2192 | } |
2193 | |
2194 | /* Allocate space and format the variable in the appropriate slot. */ |
2195 | /* XXX xasprintf */ |
2196 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); |
2197 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); |
2198 | } |
2199 | |
2200 | /* |
2201 | * Check and optionally lowercase a domain name, also removes trailing '.' |
2202 | * Returns 1 on success and 0 on failure, storing an error message in errstr. |
2203 | */ |
2204 | int |
2205 | valid_domain(char *name, int makelower, const char **errstr) |
2206 | { |
2207 | size_t i, l = strlen(name); |
2208 | u_char c, last = '\0'; |
2209 | static char errbuf[256]; |
2210 | |
2211 | if (l == 0) { |
2212 | strlcpy(errbuf, "empty domain name", sizeof(errbuf)); |
2213 | goto bad; |
2214 | } |
2215 | if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) { |
2216 | snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" " |
2217 | "starts with invalid character", name); |
2218 | goto bad; |
2219 | } |
2220 | for (i = 0; i < l; i++) { |
2221 | c = tolower((u_char)name[i]); |
2222 | if (makelower) |
2223 | name[i] = (char)c; |
2224 | if (last == '.' && c == '.') { |
2225 | snprintf(errbuf, sizeof(errbuf), "domain name " |
2226 | "\"%.100s\" contains consecutive separators", name); |
2227 | goto bad; |
2228 | } |
2229 | if (c != '.' && c != '-' && !isalnum(c) && |
2230 | c != '_') /* technically invalid, but common */ { |
2231 | snprintf(errbuf, sizeof(errbuf), "domain name " |
2232 | "\"%.100s\" contains invalid characters", name); |
2233 | goto bad; |
2234 | } |
2235 | last = c; |
2236 | } |
2237 | if (name[l - 1] == '.') |
2238 | name[l - 1] = '\0'; |
2239 | if (errstr != NULL((void *)0)) |
2240 | *errstr = NULL((void *)0); |
2241 | return 1; |
2242 | bad: |
2243 | if (errstr != NULL((void *)0)) |
2244 | *errstr = errbuf; |
2245 | return 0; |
2246 | } |
2247 | |
2248 | /* |
2249 | * Verify that a environment variable name (not including initial '$') is |
2250 | * valid; consisting of one or more alphanumeric or underscore characters only. |
2251 | * Returns 1 on valid, 0 otherwise. |
2252 | */ |
2253 | int |
2254 | valid_env_name(const char *name) |
2255 | { |
2256 | const char *cp; |
2257 | |
2258 | if (name[0] == '\0') |
2259 | return 0; |
2260 | for (cp = name; *cp != '\0'; cp++) { |
2261 | if (!isalnum((u_char)*cp) && *cp != '_') |
2262 | return 0; |
2263 | } |
2264 | return 1; |
2265 | } |
2266 | |
2267 | const char * |
2268 | atoi_err(const char *nptr, int *val) |
2269 | { |
2270 | const char *errstr = NULL((void *)0); |
2271 | long long num; |
2272 | |
2273 | if (nptr == NULL((void *)0) || *nptr == '\0') |
2274 | return "missing"; |
2275 | num = strtonum(nptr, 0, INT_MAX2147483647, &errstr); |
2276 | if (errstr == NULL((void *)0)) |
2277 | *val = (int)num; |
2278 | return errstr; |
2279 | } |
2280 | |
2281 | int |
2282 | parse_absolute_time(const char *s, uint64_t *tp) |
2283 | { |
2284 | struct tm tm; |
2285 | time_t tt; |
2286 | char buf[32], *fmt; |
2287 | |
2288 | *tp = 0; |
2289 | |
2290 | /* |
2291 | * POSIX strptime says "The application shall ensure that there |
2292 | * is white-space or other non-alphanumeric characters between |
2293 | * any two conversion specifications" so arrange things this way. |
2294 | */ |
2295 | switch (strlen(s)) { |
2296 | case 8: /* YYYYMMDD */ |
2297 | fmt = "%Y-%m-%d"; |
2298 | snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); |
2299 | break; |
2300 | case 12: /* YYYYMMDDHHMM */ |
2301 | fmt = "%Y-%m-%dT%H:%M"; |
2302 | snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s", |
2303 | s, s + 4, s + 6, s + 8, s + 10); |
2304 | break; |
2305 | case 14: /* YYYYMMDDHHMMSS */ |
2306 | fmt = "%Y-%m-%dT%H:%M:%S"; |
2307 | snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", |
2308 | s, s + 4, s + 6, s + 8, s + 10, s + 12); |
2309 | break; |
2310 | default: |
2311 | return SSH_ERR_INVALID_FORMAT-4; |
2312 | } |
2313 | |
2314 | memset(&tm, 0, sizeof(tm)); |
2315 | if (strptime(buf, fmt, &tm) == NULL((void *)0)) |
2316 | return SSH_ERR_INVALID_FORMAT-4; |
2317 | if ((tt = mktime(&tm)) < 0) |
2318 | return SSH_ERR_INVALID_FORMAT-4; |
2319 | /* success */ |
2320 | *tp = (uint64_t)tt; |
2321 | return 0; |
2322 | } |
2323 | |
2324 | /* On OpenBSD time_t is int64_t which is long long. */ |
2325 | #define SSH_TIME_T_MAX9223372036854775807LL LLONG_MAX9223372036854775807LL |
2326 | |
2327 | void |
2328 | format_absolute_time(uint64_t t, char *buf, size_t len) |
2329 | { |
2330 | time_t tt = t > SSH_TIME_T_MAX9223372036854775807LL ? SSH_TIME_T_MAX9223372036854775807LL : t; |
2331 | struct tm tm; |
2332 | |
2333 | localtime_r(&tt, &tm); |
2334 | strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm); |
2335 | } |
2336 | |
2337 | /* check if path is absolute */ |
2338 | int |
2339 | path_absolute(const char *path) |
2340 | { |
2341 | return (*path == '/') ? 1 : 0; |
2342 | } |
2343 | |
2344 | void |
2345 | skip_space(char **cpp) |
2346 | { |
2347 | char *cp; |
2348 | |
2349 | for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++) |
2350 | ; |
2351 | *cpp = cp; |
2352 | } |
2353 | |
2354 | /* authorized_key-style options parsing helpers */ |
2355 | |
2356 | /* |
2357 | * Match flag 'opt' in *optsp, and if allow_negate is set then also match |
2358 | * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0 |
2359 | * if negated option matches. |
2360 | * If the option or negated option matches, then *optsp is updated to |
2361 | * point to the first character after the option. |
2362 | */ |
2363 | int |
2364 | opt_flag(const char *opt, int allow_negate, const char **optsp) |
2365 | { |
2366 | size_t opt_len = strlen(opt); |
2367 | const char *opts = *optsp; |
2368 | int negate = 0; |
2369 | |
2370 | if (allow_negate && strncasecmp(opts, "no-", 3) == 0) { |
2371 | opts += 3; |
2372 | negate = 1; |
2373 | } |
2374 | if (strncasecmp(opts, opt, opt_len) == 0) { |
2375 | *optsp = opts + opt_len; |
2376 | return negate ? 0 : 1; |
2377 | } |
2378 | return -1; |
2379 | } |
2380 | |
2381 | char * |
2382 | opt_dequote(const char **sp, const char **errstrp) |
2383 | { |
2384 | const char *s = *sp; |
2385 | char *ret; |
2386 | size_t i; |
2387 | |
2388 | *errstrp = NULL((void *)0); |
2389 | if (*s != '"') { |
2390 | *errstrp = "missing start quote"; |
2391 | return NULL((void *)0); |
2392 | } |
2393 | s++; |
2394 | if ((ret = malloc(strlen((s)) + 1)) == NULL((void *)0)) { |
2395 | *errstrp = "memory allocation failed"; |
2396 | return NULL((void *)0); |
2397 | } |
2398 | for (i = 0; *s != '\0' && *s != '"';) { |
2399 | if (s[0] == '\\' && s[1] == '"') |
2400 | s++; |
2401 | ret[i++] = *s++; |
2402 | } |
2403 | if (*s == '\0') { |
2404 | *errstrp = "missing end quote"; |
2405 | free(ret); |
2406 | return NULL((void *)0); |
2407 | } |
2408 | ret[i] = '\0'; |
2409 | s++; |
2410 | *sp = s; |
2411 | return ret; |
2412 | } |
2413 | |
2414 | int |
2415 | opt_match(const char **opts, const char *term) |
2416 | { |
2417 | if (strncasecmp((*opts), term, strlen(term)) == 0 && |
2418 | (*opts)[strlen(term)] == '=') { |
2419 | *opts += strlen(term) + 1; |
2420 | return 1; |
2421 | } |
2422 | return 0; |
2423 | } |
2424 | |
2425 | void |
2426 | opt_array_append2(const char *file, const int line, const char *directive, |
2427 | char ***array, int **iarray, u_int *lp, const char *s, int i) |
2428 | { |
2429 | |
2430 | if (*lp >= INT_MAX2147483647) |
2431 | fatal("%s line %d: Too many %s entries", file, line, directive)sshfatal("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2431 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "%s line %d: Too many %s entries" , file, line, directive); |
2432 | |
2433 | if (iarray != NULL((void *)0)) { |
2434 | *iarray = xrecallocarray(*iarray, *lp, *lp + 1, |
2435 | sizeof(**iarray)); |
2436 | (*iarray)[*lp] = i; |
2437 | } |
2438 | |
2439 | *array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array)); |
2440 | (*array)[*lp] = xstrdup(s); |
2441 | (*lp)++; |
2442 | } |
2443 | |
2444 | void |
2445 | opt_array_append(const char *file, const int line, const char *directive, |
2446 | char ***array, u_int *lp, const char *s) |
2447 | { |
2448 | opt_array_append2(file, line, directive, array, NULL((void *)0), lp, s, 0); |
2449 | } |
2450 | |
2451 | sshsig_t |
2452 | ssh_signal(int signum, sshsig_t handler) |
2453 | { |
2454 | struct sigaction sa, osa; |
2455 | |
2456 | /* mask all other signals while in handler */ |
2457 | memset(&sa, 0, sizeof(sa)); |
2458 | sa.sa_handler__sigaction_u.__sa_handler = handler; |
2459 | sigfillset(&sa.sa_mask); |
2460 | if (signum != SIGALRM14) |
2461 | sa.sa_flags = SA_RESTART0x0002; |
2462 | if (sigaction(signum, &sa, &osa) == -1) { |
2463 | debug3("sigaction(%s): %s", strsignal(signum), strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2463, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "sigaction(%s): %s", strsignal (signum), strerror((*__errno()))); |
2464 | return SIG_ERR(void (*)(int))-1; |
2465 | } |
2466 | return osa.sa_handler__sigaction_u.__sa_handler; |
2467 | } |
2468 | |
2469 | int |
2470 | stdfd_devnull(int do_stdin, int do_stdout, int do_stderr) |
2471 | { |
2472 | int devnull, ret = 0; |
2473 | |
2474 | if ((devnull = open(_PATH_DEVNULL"/dev/null", O_RDWR0x0002)) == -1) { |
2475 | error_f("open %s: %s", _PATH_DEVNULL,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2476, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "open %s: %s", "/dev/null" , strerror((*__errno()))) |
2476 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2476, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "open %s: %s", "/dev/null" , strerror((*__errno()))); |
2477 | return -1; |
2478 | } |
2479 | if ((do_stdin && dup2(devnull, STDIN_FILENO0) == -1) || |
2480 | (do_stdout && dup2(devnull, STDOUT_FILENO1) == -1) || |
2481 | (do_stderr && dup2(devnull, STDERR_FILENO2) == -1)) { |
2482 | error_f("dup2: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2482, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "dup2: %s", strerror((*__errno ()))); |
2483 | ret = -1; |
2484 | } |
2485 | if (devnull > STDERR_FILENO2) |
2486 | close(devnull); |
2487 | return ret; |
2488 | } |
2489 | |
2490 | /* |
2491 | * Runs command in a subprocess with a minimal environment. |
2492 | * Returns pid on success, 0 on failure. |
2493 | * The child stdout and stderr maybe captured, left attached or sent to |
2494 | * /dev/null depending on the contents of flags. |
2495 | * "tag" is prepended to log messages. |
2496 | * NB. "command" is only used for logging; the actual command executed is |
2497 | * av[0]. |
2498 | */ |
2499 | pid_t |
2500 | subprocess(const char *tag, const char *command, |
2501 | int ac, char **av, FILE **child, u_int flags, |
2502 | struct passwd *pw, privdrop_fn *drop_privs, privrestore_fn *restore_privs) |
2503 | { |
2504 | FILE *f = NULL((void *)0); |
2505 | struct stat st; |
2506 | int fd, devnull, p[2], i; |
2507 | pid_t pid; |
2508 | char *cp, errmsg[512]; |
2509 | u_int nenv = 0; |
2510 | char **env = NULL((void *)0); |
2511 | |
2512 | /* If dropping privs, then must specify user and restore function */ |
2513 | if (drop_privs != NULL((void *)0) && (pw == NULL((void *)0) || restore_privs == NULL((void *)0))) { |
2514 | error("%s: inconsistent arguments", tag)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2514, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: inconsistent arguments" , tag); /* XXX fatal? */ |
2515 | return 0; |
2516 | } |
2517 | if (pw == NULL((void *)0) && (pw = getpwuid(getuid())) == NULL((void *)0)) { |
2518 | error("%s: no user for current uid", tag)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2518, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: no user for current uid" , tag); |
2519 | return 0; |
2520 | } |
2521 | if (child != NULL((void *)0)) |
2522 | *child = NULL((void *)0); |
2523 | |
2524 | debug3_f("%s command \"%s\" running as %s (flags 0x%x)",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2525, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s command \"%s\" running as %s (flags 0x%x)" , tag, command, pw->pw_name, flags) |
2525 | tag, command, pw->pw_name, flags)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2525, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s command \"%s\" running as %s (flags 0x%x)" , tag, command, pw->pw_name, flags); |
2526 | |
2527 | /* Check consistency */ |
2528 | if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD(1)) != 0 && |
2529 | (flags & SSH_SUBPROCESS_STDOUT_CAPTURE(1<<1)) != 0) { |
2530 | error_f("inconsistent flags")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2530, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "inconsistent flags"); |
2531 | return 0; |
2532 | } |
2533 | if (((flags & SSH_SUBPROCESS_STDOUT_CAPTURE(1<<1)) == 0) != (child == NULL((void *)0))) { |
2534 | error_f("inconsistent flags/output")sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2534, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "inconsistent flags/output" ); |
2535 | return 0; |
2536 | } |
2537 | |
2538 | /* |
2539 | * If executing an explicit binary, then verify the it exists |
2540 | * and appears safe-ish to execute |
2541 | */ |
2542 | if (!path_absolute(av[0])) { |
2543 | error("%s path is not absolute", tag)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2543, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s path is not absolute", tag); |
2544 | return 0; |
2545 | } |
2546 | if (drop_privs != NULL((void *)0)) |
2547 | drop_privs(pw); |
2548 | if (stat(av[0], &st) == -1) { |
2549 | error("Could not stat %s \"%s\": %s", tag,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2550, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Could not stat %s \"%s\": %s" , tag, av[0], strerror((*__errno()))) |
2550 | av[0], strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2550, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Could not stat %s \"%s\": %s" , tag, av[0], strerror((*__errno()))); |
2551 | goto restore_return; |
2552 | } |
2553 | if ((flags & SSH_SUBPROCESS_UNSAFE_PATH(1<<3)) == 0 && |
2554 | safe_path(av[0], &st, NULL((void *)0), 0, errmsg, sizeof(errmsg)) != 0) { |
2555 | error("Unsafe %s \"%s\": %s", tag, av[0], errmsg)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2555, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Unsafe %s \"%s\": %s", tag , av[0], errmsg); |
2556 | goto restore_return; |
2557 | } |
2558 | /* Prepare to keep the child's stdout if requested */ |
2559 | if (pipe(p) == -1) { |
2560 | error("%s: pipe: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2560, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: pipe: %s", tag, strerror ((*__errno()))); |
2561 | restore_return: |
2562 | if (restore_privs != NULL((void *)0)) |
2563 | restore_privs(); |
2564 | return 0; |
2565 | } |
2566 | if (restore_privs != NULL((void *)0)) |
2567 | restore_privs(); |
2568 | |
2569 | switch ((pid = fork())) { |
2570 | case -1: /* error */ |
2571 | error("%s: fork: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2571, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: fork: %s", tag, strerror ((*__errno()))); |
2572 | close(p[0]); |
2573 | close(p[1]); |
2574 | return 0; |
2575 | case 0: /* child */ |
2576 | /* Prepare a minimal environment for the child. */ |
2577 | if ((flags & SSH_SUBPROCESS_PRESERVE_ENV(1<<4)) == 0) { |
2578 | nenv = 5; |
2579 | env = xcalloc(sizeof(*env), nenv); |
2580 | child_set_env(&env, &nenv, "PATH", _PATH_STDPATH"/usr/bin:/bin:/usr/sbin:/sbin:/usr/X11R6/bin:/usr/local/bin:/usr/local/sbin"); |
2581 | child_set_env(&env, &nenv, "USER", pw->pw_name); |
2582 | child_set_env(&env, &nenv, "LOGNAME", pw->pw_name); |
2583 | child_set_env(&env, &nenv, "HOME", pw->pw_dir); |
2584 | if ((cp = getenv("LANG")) != NULL((void *)0)) |
2585 | child_set_env(&env, &nenv, "LANG", cp); |
2586 | } |
2587 | |
2588 | for (i = 1; i < NSIG33; i++) |
2589 | ssh_signal(i, SIG_DFL(void (*)(int))0); |
2590 | |
2591 | if ((devnull = open(_PATH_DEVNULL"/dev/null", O_RDWR0x0002)) == -1) { |
2592 | error("%s: open %s: %s", tag, _PATH_DEVNULL,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2593, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: open %s: %s", tag, "/dev/null" , strerror((*__errno()))) |
2593 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2593, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: open %s: %s", tag, "/dev/null" , strerror((*__errno()))); |
2594 | _exit(1); |
2595 | } |
2596 | if (dup2(devnull, STDIN_FILENO0) == -1) { |
2597 | error("%s: dup2: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2597, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: dup2: %s", tag, strerror ((*__errno()))); |
2598 | _exit(1); |
2599 | } |
2600 | |
2601 | /* Set up stdout as requested; leave stderr in place for now. */ |
2602 | fd = -1; |
2603 | if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE(1<<1)) != 0) |
2604 | fd = p[1]; |
2605 | else if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD(1)) != 0) |
2606 | fd = devnull; |
2607 | if (fd != -1 && dup2(fd, STDOUT_FILENO1) == -1) { |
2608 | error("%s: dup2: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2608, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: dup2: %s", tag, strerror ((*__errno()))); |
2609 | _exit(1); |
2610 | } |
2611 | closefrom(STDERR_FILENO2 + 1); |
2612 | |
2613 | if (geteuid() == 0 && |
2614 | initgroups(pw->pw_name, pw->pw_gid) == -1) { |
2615 | error("%s: initgroups(%s, %u): %s", tag,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2616, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: initgroups(%s, %u): %s" , tag, pw->pw_name, (u_int)pw->pw_gid, strerror((*__errno ()))) |
2616 | pw->pw_name, (u_int)pw->pw_gid, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2616, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: initgroups(%s, %u): %s" , tag, pw->pw_name, (u_int)pw->pw_gid, strerror((*__errno ()))); |
2617 | _exit(1); |
2618 | } |
2619 | if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1) { |
2620 | error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2621, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: setresgid %u: %s", tag , (u_int)pw->pw_gid, strerror((*__errno()))) |
2621 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2621, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: setresgid %u: %s", tag , (u_int)pw->pw_gid, strerror((*__errno()))); |
2622 | _exit(1); |
2623 | } |
2624 | if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1) { |
2625 | error("%s: setresuid %u: %s", tag, (u_int)pw->pw_uid,sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2626, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: setresuid %u: %s", tag , (u_int)pw->pw_uid, strerror((*__errno()))) |
2626 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2626, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: setresuid %u: %s", tag , (u_int)pw->pw_uid, strerror((*__errno()))); |
2627 | _exit(1); |
2628 | } |
2629 | /* stdin is pointed to /dev/null at this point */ |
2630 | if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD(1)) != 0 && |
2631 | dup2(STDIN_FILENO0, STDERR_FILENO2) == -1) { |
2632 | error("%s: dup2: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2632, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: dup2: %s", tag, strerror ((*__errno()))); |
2633 | _exit(1); |
2634 | } |
2635 | if (env != NULL((void *)0)) |
2636 | execve(av[0], av, env); |
2637 | else |
2638 | execv(av[0], av); |
2639 | error("%s %s \"%s\": %s", tag, env == NULL ? "execv" : "execve",sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2640, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s %s \"%s\": %s", tag, env == ((void *)0) ? "execv" : "execve", command, strerror((*__errno ()))) |
2640 | command, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2640, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s %s \"%s\": %s", tag, env == ((void *)0) ? "execv" : "execve", command, strerror((*__errno ()))); |
2641 | _exit(127); |
2642 | default: /* parent */ |
2643 | break; |
2644 | } |
2645 | |
2646 | close(p[1]); |
2647 | if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE(1<<1)) == 0) |
2648 | close(p[0]); |
2649 | else if ((f = fdopen(p[0], "r")) == NULL((void *)0)) { |
2650 | error("%s: fdopen: %s", tag, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2650, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "%s: fdopen: %s", tag, strerror ((*__errno()))); |
2651 | close(p[0]); |
2652 | /* Don't leave zombie child */ |
2653 | kill(pid, SIGTERM15); |
2654 | while (waitpid(pid, NULL((void *)0), 0) == -1 && errno(*__errno()) == EINTR4) |
2655 | ; |
2656 | return 0; |
2657 | } |
2658 | /* Success */ |
2659 | debug3_f("%s pid %ld", tag, (long)pid)sshlog("/usr/src/usr.bin/ssh/ssh/../misc.c", __func__, 2659, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s pid %ld", tag, (long) pid); |
2660 | if (child != NULL((void *)0)) |
2661 | *child = f; |
2662 | return pid; |
2663 | } |
2664 | |
2665 | const char * |
2666 | lookup_env_in_list(const char *env, char * const *envs, size_t nenvs) |
2667 | { |
2668 | size_t i, envlen; |
2669 | |
2670 | envlen = strlen(env); |
2671 | for (i = 0; i < nenvs; i++) { |
2672 | if (strncmp(envs[i], env, envlen) == 0 && |
2673 | envs[i][envlen] == '=') { |
2674 | return envs[i] + envlen + 1; |
2675 | } |
2676 | } |
2677 | return NULL((void *)0); |
2678 | } |