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47686178 | 1 | /* $OpenBSD: misc.c,v 1.67 2008/01/01 08:47:04 dtucker Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
9108f8d9 | 4 | * Copyright (c) 2005,2006 Damien Miller. All rights reserved. |
3c0ef626 | 5 | * |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include "includes.h" | |
2c06c99b | 28 | |
9108f8d9 | 29 | #include <sys/types.h> |
30 | #include <sys/ioctl.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/param.h> | |
33 | ||
34 | #include <stdarg.h> | |
35 | #include <stdio.h> | |
36 | #include <stdlib.h> | |
37 | #include <string.h> | |
38 | #include <unistd.h> | |
39 | ||
40 | #include <netinet/in.h> | |
41 | #include <netinet/tcp.h> | |
42 | ||
43 | #include <errno.h> | |
44 | #include <fcntl.h> | |
47686178 | 45 | #include <netdb.h> |
9108f8d9 | 46 | #ifdef HAVE_PATHS_H |
47 | # include <paths.h> | |
48 | #include <pwd.h> | |
49 | #endif | |
2c06c99b | 50 | #ifdef SSH_TUN_OPENBSD |
51 | #include <net/if.h> | |
52 | #endif | |
3c0ef626 | 53 | |
9108f8d9 | 54 | #include "xmalloc.h" |
3c0ef626 | 55 | #include "misc.h" |
56 | #include "log.h" | |
9108f8d9 | 57 | #include "ssh.h" |
3c0ef626 | 58 | |
59 | /* remove newline at end of string */ | |
60 | char * | |
61 | chop(char *s) | |
62 | { | |
63 | char *t = s; | |
64 | while (*t) { | |
e9a17296 | 65 | if (*t == '\n' || *t == '\r') { |
3c0ef626 | 66 | *t = '\0'; |
67 | return s; | |
68 | } | |
69 | t++; | |
70 | } | |
71 | return s; | |
72 | ||
73 | } | |
74 | ||
75 | /* set/unset filedescriptor to non-blocking */ | |
c9f39d2c | 76 | int |
3c0ef626 | 77 | set_nonblock(int fd) |
78 | { | |
79 | int val; | |
80 | ||
81 | val = fcntl(fd, F_GETFL, 0); | |
82 | if (val < 0) { | |
83 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
c9f39d2c | 84 | return (-1); |
3c0ef626 | 85 | } |
86 | if (val & O_NONBLOCK) { | |
c9f39d2c | 87 | debug3("fd %d is O_NONBLOCK", fd); |
88 | return (0); | |
3c0ef626 | 89 | } |
0fff78ff | 90 | debug2("fd %d setting O_NONBLOCK", fd); |
3c0ef626 | 91 | val |= O_NONBLOCK; |
c9f39d2c | 92 | if (fcntl(fd, F_SETFL, val) == -1) { |
93 | debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, | |
94 | strerror(errno)); | |
95 | return (-1); | |
96 | } | |
97 | return (0); | |
3c0ef626 | 98 | } |
99 | ||
c9f39d2c | 100 | int |
3c0ef626 | 101 | unset_nonblock(int fd) |
102 | { | |
103 | int val; | |
104 | ||
105 | val = fcntl(fd, F_GETFL, 0); | |
106 | if (val < 0) { | |
107 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
c9f39d2c | 108 | return (-1); |
3c0ef626 | 109 | } |
110 | if (!(val & O_NONBLOCK)) { | |
c9f39d2c | 111 | debug3("fd %d is not O_NONBLOCK", fd); |
112 | return (0); | |
3c0ef626 | 113 | } |
114 | debug("fd %d clearing O_NONBLOCK", fd); | |
115 | val &= ~O_NONBLOCK; | |
c9f39d2c | 116 | if (fcntl(fd, F_SETFL, val) == -1) { |
117 | debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", | |
e9a17296 | 118 | fd, strerror(errno)); |
c9f39d2c | 119 | return (-1); |
120 | } | |
121 | return (0); | |
e9a17296 | 122 | } |
123 | ||
47686178 | 124 | const char * |
125 | ssh_gai_strerror(int gaierr) | |
126 | { | |
127 | if (gaierr == EAI_SYSTEM) | |
128 | return strerror(errno); | |
129 | return gai_strerror(gaierr); | |
130 | } | |
131 | ||
e9a17296 | 132 | /* disable nagle on socket */ |
133 | void | |
134 | set_nodelay(int fd) | |
135 | { | |
136 | int opt; | |
137 | socklen_t optlen; | |
138 | ||
139 | optlen = sizeof opt; | |
140 | if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { | |
cdd66111 | 141 | debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); |
e9a17296 | 142 | return; |
143 | } | |
144 | if (opt == 1) { | |
145 | debug2("fd %d is TCP_NODELAY", fd); | |
146 | return; | |
147 | } | |
148 | opt = 1; | |
6a9b3198 | 149 | debug2("fd %d setting TCP_NODELAY", fd); |
e9a17296 | 150 | if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) |
151 | error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); | |
3c0ef626 | 152 | } |
153 | ||
154 | /* Characters considered whitespace in strsep calls. */ | |
155 | #define WHITESPACE " \t\r\n" | |
9108f8d9 | 156 | #define QUOTE "\"" |
3c0ef626 | 157 | |
158 | /* return next token in configuration line */ | |
159 | char * | |
160 | strdelim(char **s) | |
161 | { | |
162 | char *old; | |
163 | int wspace = 0; | |
164 | ||
165 | if (*s == NULL) | |
166 | return NULL; | |
167 | ||
168 | old = *s; | |
169 | ||
9108f8d9 | 170 | *s = strpbrk(*s, WHITESPACE QUOTE "="); |
3c0ef626 | 171 | if (*s == NULL) |
172 | return (old); | |
173 | ||
9108f8d9 | 174 | if (*s[0] == '\"') { |
175 | memmove(*s, *s + 1, strlen(*s)); /* move nul too */ | |
176 | /* Find matching quote */ | |
177 | if ((*s = strpbrk(*s, QUOTE)) == NULL) { | |
178 | return (NULL); /* no matching quote */ | |
179 | } else { | |
180 | *s[0] = '\0'; | |
181 | return (old); | |
182 | } | |
183 | } | |
184 | ||
3c0ef626 | 185 | /* Allow only one '=' to be skipped */ |
186 | if (*s[0] == '=') | |
187 | wspace = 1; | |
188 | *s[0] = '\0'; | |
189 | ||
9108f8d9 | 190 | /* Skip any extra whitespace after first token */ |
3c0ef626 | 191 | *s += strspn(*s + 1, WHITESPACE) + 1; |
192 | if (*s[0] == '=' && !wspace) | |
193 | *s += strspn(*s + 1, WHITESPACE) + 1; | |
194 | ||
195 | return (old); | |
196 | } | |
197 | ||
198 | struct passwd * | |
199 | pwcopy(struct passwd *pw) | |
200 | { | |
9108f8d9 | 201 | struct passwd *copy = xcalloc(1, sizeof(*copy)); |
3c0ef626 | 202 | |
3c0ef626 | 203 | copy->pw_name = xstrdup(pw->pw_name); |
204 | copy->pw_passwd = xstrdup(pw->pw_passwd); | |
205 | copy->pw_gecos = xstrdup(pw->pw_gecos); | |
206 | copy->pw_uid = pw->pw_uid; | |
207 | copy->pw_gid = pw->pw_gid; | |
208 | #ifdef HAVE_PW_EXPIRE_IN_PASSWD | |
209 | copy->pw_expire = pw->pw_expire; | |
210 | #endif | |
211 | #ifdef HAVE_PW_CHANGE_IN_PASSWD | |
212 | copy->pw_change = pw->pw_change; | |
213 | #endif | |
214 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
215 | copy->pw_class = xstrdup(pw->pw_class); | |
216 | #endif | |
217 | copy->pw_dir = xstrdup(pw->pw_dir); | |
218 | copy->pw_shell = xstrdup(pw->pw_shell); | |
219 | return copy; | |
220 | } | |
221 | ||
222 | /* | |
223 | * Convert ASCII string to TCP/IP port number. | |
224 | * Port must be >0 and <=65535. | |
225 | * Return 0 if invalid. | |
226 | */ | |
227 | int | |
228 | a2port(const char *s) | |
229 | { | |
230 | long port; | |
231 | char *endp; | |
232 | ||
233 | errno = 0; | |
234 | port = strtol(s, &endp, 0); | |
235 | if (s == endp || *endp != '\0' || | |
236 | (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) || | |
237 | port <= 0 || port > 65535) | |
238 | return 0; | |
239 | ||
240 | return port; | |
241 | } | |
242 | ||
2c06c99b | 243 | int |
244 | a2tun(const char *s, int *remote) | |
245 | { | |
246 | const char *errstr = NULL; | |
247 | char *sp, *ep; | |
248 | int tun; | |
249 | ||
250 | if (remote != NULL) { | |
251 | *remote = SSH_TUNID_ANY; | |
252 | sp = xstrdup(s); | |
253 | if ((ep = strchr(sp, ':')) == NULL) { | |
254 | xfree(sp); | |
255 | return (a2tun(s, NULL)); | |
256 | } | |
257 | ep[0] = '\0'; ep++; | |
258 | *remote = a2tun(ep, NULL); | |
259 | tun = a2tun(sp, NULL); | |
260 | xfree(sp); | |
261 | return (*remote == SSH_TUNID_ERR ? *remote : tun); | |
262 | } | |
263 | ||
264 | if (strcasecmp(s, "any") == 0) | |
265 | return (SSH_TUNID_ANY); | |
266 | ||
267 | tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); | |
268 | if (errstr != NULL) | |
269 | return (SSH_TUNID_ERR); | |
270 | ||
271 | return (tun); | |
272 | } | |
273 | ||
3c0ef626 | 274 | #define SECONDS 1 |
275 | #define MINUTES (SECONDS * 60) | |
276 | #define HOURS (MINUTES * 60) | |
277 | #define DAYS (HOURS * 24) | |
278 | #define WEEKS (DAYS * 7) | |
279 | ||
280 | /* | |
281 | * Convert a time string into seconds; format is | |
282 | * a sequence of: | |
283 | * time[qualifier] | |
284 | * | |
285 | * Valid time qualifiers are: | |
286 | * <none> seconds | |
287 | * s|S seconds | |
288 | * m|M minutes | |
289 | * h|H hours | |
290 | * d|D days | |
291 | * w|W weeks | |
292 | * | |
293 | * Examples: | |
294 | * 90m 90 minutes | |
295 | * 1h30m 90 minutes | |
296 | * 2d 2 days | |
297 | * 1w 1 week | |
298 | * | |
299 | * Return -1 if time string is invalid. | |
300 | */ | |
301 | long | |
302 | convtime(const char *s) | |
303 | { | |
304 | long total, secs; | |
305 | const char *p; | |
306 | char *endp; | |
307 | ||
308 | errno = 0; | |
309 | total = 0; | |
310 | p = s; | |
311 | ||
312 | if (p == NULL || *p == '\0') | |
313 | return -1; | |
314 | ||
315 | while (*p) { | |
316 | secs = strtol(p, &endp, 10); | |
317 | if (p == endp || | |
318 | (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || | |
319 | secs < 0) | |
320 | return -1; | |
321 | ||
322 | switch (*endp++) { | |
323 | case '\0': | |
324 | endp--; | |
9108f8d9 | 325 | break; |
3c0ef626 | 326 | case 's': |
327 | case 'S': | |
328 | break; | |
329 | case 'm': | |
330 | case 'M': | |
331 | secs *= MINUTES; | |
332 | break; | |
333 | case 'h': | |
334 | case 'H': | |
335 | secs *= HOURS; | |
336 | break; | |
337 | case 'd': | |
338 | case 'D': | |
339 | secs *= DAYS; | |
340 | break; | |
341 | case 'w': | |
342 | case 'W': | |
343 | secs *= WEEKS; | |
344 | break; | |
345 | default: | |
346 | return -1; | |
347 | } | |
348 | total += secs; | |
349 | if (total < 0) | |
350 | return -1; | |
351 | p = endp; | |
352 | } | |
353 | ||
354 | return total; | |
355 | } | |
356 | ||
9108f8d9 | 357 | /* |
358 | * Returns a standardized host+port identifier string. | |
359 | * Caller must free returned string. | |
360 | */ | |
361 | char * | |
362 | put_host_port(const char *host, u_short port) | |
363 | { | |
364 | char *hoststr; | |
365 | ||
366 | if (port == 0 || port == SSH_DEFAULT_PORT) | |
367 | return(xstrdup(host)); | |
368 | if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0) | |
369 | fatal("put_host_port: asprintf: %s", strerror(errno)); | |
370 | debug3("put_host_port: %s", hoststr); | |
371 | return hoststr; | |
372 | } | |
373 | ||
996d5e62 | 374 | /* |
375 | * Search for next delimiter between hostnames/addresses and ports. | |
376 | * Argument may be modified (for termination). | |
377 | * Returns *cp if parsing succeeds. | |
378 | * *cp is set to the start of the next delimiter, if one was found. | |
379 | * If this is the last field, *cp is set to NULL. | |
380 | */ | |
381 | char * | |
382 | hpdelim(char **cp) | |
383 | { | |
384 | char *s, *old; | |
385 | ||
386 | if (cp == NULL || *cp == NULL) | |
387 | return NULL; | |
388 | ||
389 | old = s = *cp; | |
390 | if (*s == '[') { | |
391 | if ((s = strchr(s, ']')) == NULL) | |
392 | return NULL; | |
393 | else | |
394 | s++; | |
395 | } else if ((s = strpbrk(s, ":/")) == NULL) | |
396 | s = *cp + strlen(*cp); /* skip to end (see first case below) */ | |
397 | ||
398 | switch (*s) { | |
399 | case '\0': | |
400 | *cp = NULL; /* no more fields*/ | |
401 | break; | |
dec6d9fe | 402 | |
996d5e62 | 403 | case ':': |
404 | case '/': | |
405 | *s = '\0'; /* terminate */ | |
406 | *cp = s + 1; | |
407 | break; | |
dec6d9fe | 408 | |
996d5e62 | 409 | default: |
410 | return NULL; | |
411 | } | |
412 | ||
413 | return old; | |
414 | } | |
415 | ||
3c0ef626 | 416 | char * |
417 | cleanhostname(char *host) | |
418 | { | |
419 | if (*host == '[' && host[strlen(host) - 1] == ']') { | |
420 | host[strlen(host) - 1] = '\0'; | |
421 | return (host + 1); | |
422 | } else | |
423 | return host; | |
424 | } | |
425 | ||
426 | char * | |
427 | colon(char *cp) | |
428 | { | |
429 | int flag = 0; | |
430 | ||
431 | if (*cp == ':') /* Leading colon is part of file name. */ | |
432 | return (0); | |
433 | if (*cp == '[') | |
434 | flag = 1; | |
435 | ||
436 | for (; *cp; ++cp) { | |
437 | if (*cp == '@' && *(cp+1) == '[') | |
438 | flag = 1; | |
439 | if (*cp == ']' && *(cp+1) == ':' && flag) | |
440 | return (cp+1); | |
441 | if (*cp == ':' && !flag) | |
442 | return (cp); | |
443 | if (*cp == '/') | |
444 | return (0); | |
445 | } | |
446 | return (0); | |
447 | } | |
448 | ||
449 | /* function to assist building execv() arguments */ | |
450 | void | |
451 | addargs(arglist *args, char *fmt, ...) | |
452 | { | |
453 | va_list ap; | |
2c06c99b | 454 | char *cp; |
c9f39d2c | 455 | u_int nalloc; |
2c06c99b | 456 | int r; |
3c0ef626 | 457 | |
458 | va_start(ap, fmt); | |
2c06c99b | 459 | r = vasprintf(&cp, fmt, ap); |
3c0ef626 | 460 | va_end(ap); |
2c06c99b | 461 | if (r == -1) |
462 | fatal("addargs: argument too long"); | |
3c0ef626 | 463 | |
acc3d05e | 464 | nalloc = args->nalloc; |
3c0ef626 | 465 | if (args->list == NULL) { |
acc3d05e | 466 | nalloc = 32; |
3c0ef626 | 467 | args->num = 0; |
acc3d05e | 468 | } else if (args->num+2 >= nalloc) |
469 | nalloc *= 2; | |
3c0ef626 | 470 | |
9108f8d9 | 471 | args->list = xrealloc(args->list, nalloc, sizeof(char *)); |
acc3d05e | 472 | args->nalloc = nalloc; |
2c06c99b | 473 | args->list[args->num++] = cp; |
3c0ef626 | 474 | args->list[args->num] = NULL; |
475 | } | |
996d5e62 | 476 | |
2c06c99b | 477 | void |
478 | replacearg(arglist *args, u_int which, char *fmt, ...) | |
479 | { | |
480 | va_list ap; | |
481 | char *cp; | |
482 | int r; | |
483 | ||
484 | va_start(ap, fmt); | |
485 | r = vasprintf(&cp, fmt, ap); | |
486 | va_end(ap); | |
487 | if (r == -1) | |
488 | fatal("replacearg: argument too long"); | |
489 | ||
490 | if (which >= args->num) | |
491 | fatal("replacearg: tried to replace invalid arg %d >= %d", | |
492 | which, args->num); | |
493 | xfree(args->list[which]); | |
494 | args->list[which] = cp; | |
495 | } | |
496 | ||
497 | void | |
498 | freeargs(arglist *args) | |
499 | { | |
500 | u_int i; | |
501 | ||
502 | if (args->list != NULL) { | |
503 | for (i = 0; i < args->num; i++) | |
504 | xfree(args->list[i]); | |
505 | xfree(args->list); | |
506 | args->nalloc = args->num = 0; | |
507 | args->list = NULL; | |
508 | } | |
509 | } | |
510 | ||
665a873d | 511 | /* |
512 | * Expands tildes in the file name. Returns data allocated by xmalloc. | |
513 | * Warning: this calls getpw*. | |
514 | */ | |
515 | char * | |
516 | tilde_expand_filename(const char *filename, uid_t uid) | |
517 | { | |
518 | const char *path; | |
519 | char user[128], ret[MAXPATHLEN]; | |
520 | struct passwd *pw; | |
521 | u_int len, slash; | |
522 | ||
523 | if (*filename != '~') | |
524 | return (xstrdup(filename)); | |
525 | filename++; | |
526 | ||
527 | path = strchr(filename, '/'); | |
528 | if (path != NULL && path > filename) { /* ~user/path */ | |
529 | slash = path - filename; | |
530 | if (slash > sizeof(user) - 1) | |
531 | fatal("tilde_expand_filename: ~username too long"); | |
532 | memcpy(user, filename, slash); | |
533 | user[slash] = '\0'; | |
534 | if ((pw = getpwnam(user)) == NULL) | |
535 | fatal("tilde_expand_filename: No such user %s", user); | |
536 | } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ | |
537 | fatal("tilde_expand_filename: No such uid %d", uid); | |
538 | ||
539 | if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret)) | |
540 | fatal("tilde_expand_filename: Path too long"); | |
541 | ||
542 | /* Make sure directory has a trailing '/' */ | |
543 | len = strlen(pw->pw_dir); | |
544 | if ((len == 0 || pw->pw_dir[len - 1] != '/') && | |
545 | strlcat(ret, "/", sizeof(ret)) >= sizeof(ret)) | |
546 | fatal("tilde_expand_filename: Path too long"); | |
547 | ||
548 | /* Skip leading '/' from specified path */ | |
549 | if (path != NULL) | |
550 | filename = path + 1; | |
551 | if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret)) | |
552 | fatal("tilde_expand_filename: Path too long"); | |
553 | ||
554 | return (xstrdup(ret)); | |
555 | } | |
556 | ||
557 | /* | |
558 | * Expand a string with a set of %[char] escapes. A number of escapes may be | |
559 | * specified as (char *escape_chars, char *replacement) pairs. The list must | |
560 | * be terminated by a NULL escape_char. Returns replaced string in memory | |
561 | * allocated by xmalloc. | |
562 | */ | |
563 | char * | |
564 | percent_expand(const char *string, ...) | |
565 | { | |
566 | #define EXPAND_MAX_KEYS 16 | |
567 | struct { | |
568 | const char *key; | |
569 | const char *repl; | |
570 | } keys[EXPAND_MAX_KEYS]; | |
571 | u_int num_keys, i, j; | |
572 | char buf[4096]; | |
573 | va_list ap; | |
574 | ||
575 | /* Gather keys */ | |
576 | va_start(ap, string); | |
577 | for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { | |
578 | keys[num_keys].key = va_arg(ap, char *); | |
579 | if (keys[num_keys].key == NULL) | |
580 | break; | |
581 | keys[num_keys].repl = va_arg(ap, char *); | |
582 | if (keys[num_keys].repl == NULL) | |
583 | fatal("percent_expand: NULL replacement"); | |
584 | } | |
585 | va_end(ap); | |
586 | ||
587 | if (num_keys >= EXPAND_MAX_KEYS) | |
588 | fatal("percent_expand: too many keys"); | |
589 | ||
590 | /* Expand string */ | |
591 | *buf = '\0'; | |
592 | for (i = 0; *string != '\0'; string++) { | |
593 | if (*string != '%') { | |
594 | append: | |
595 | buf[i++] = *string; | |
596 | if (i >= sizeof(buf)) | |
597 | fatal("percent_expand: string too long"); | |
598 | buf[i] = '\0'; | |
599 | continue; | |
600 | } | |
601 | string++; | |
602 | if (*string == '%') | |
603 | goto append; | |
604 | for (j = 0; j < num_keys; j++) { | |
605 | if (strchr(keys[j].key, *string) != NULL) { | |
606 | i = strlcat(buf, keys[j].repl, sizeof(buf)); | |
607 | if (i >= sizeof(buf)) | |
608 | fatal("percent_expand: string too long"); | |
609 | break; | |
610 | } | |
611 | } | |
612 | if (j >= num_keys) | |
613 | fatal("percent_expand: unknown key %%%c", *string); | |
614 | } | |
615 | return (xstrdup(buf)); | |
616 | #undef EXPAND_MAX_KEYS | |
617 | } | |
618 | ||
996d5e62 | 619 | /* |
620 | * Read an entire line from a public key file into a static buffer, discarding | |
621 | * lines that exceed the buffer size. Returns 0 on success, -1 on failure. | |
622 | */ | |
623 | int | |
624 | read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, | |
625 | u_long *lineno) | |
626 | { | |
627 | while (fgets(buf, bufsz, f) != NULL) { | |
799ae497 | 628 | if (buf[0] == '\0') |
629 | continue; | |
996d5e62 | 630 | (*lineno)++; |
631 | if (buf[strlen(buf) - 1] == '\n' || feof(f)) { | |
632 | return 0; | |
633 | } else { | |
634 | debug("%s: %s line %lu exceeds size limit", __func__, | |
635 | filename, *lineno); | |
636 | /* discard remainder of line */ | |
dec6d9fe | 637 | while (fgetc(f) != '\n' && !feof(f)) |
996d5e62 | 638 | ; /* nothing */ |
639 | } | |
640 | } | |
641 | return -1; | |
642 | } | |
665a873d | 643 | |
2c06c99b | 644 | int |
645 | tun_open(int tun, int mode) | |
646 | { | |
647 | #if defined(CUSTOM_SYS_TUN_OPEN) | |
648 | return (sys_tun_open(tun, mode)); | |
649 | #elif defined(SSH_TUN_OPENBSD) | |
650 | struct ifreq ifr; | |
651 | char name[100]; | |
652 | int fd = -1, sock; | |
653 | ||
654 | /* Open the tunnel device */ | |
655 | if (tun <= SSH_TUNID_MAX) { | |
656 | snprintf(name, sizeof(name), "/dev/tun%d", tun); | |
657 | fd = open(name, O_RDWR); | |
658 | } else if (tun == SSH_TUNID_ANY) { | |
659 | for (tun = 100; tun >= 0; tun--) { | |
660 | snprintf(name, sizeof(name), "/dev/tun%d", tun); | |
661 | if ((fd = open(name, O_RDWR)) >= 0) | |
662 | break; | |
663 | } | |
664 | } else { | |
665 | debug("%s: invalid tunnel %u", __func__, tun); | |
666 | return (-1); | |
667 | } | |
668 | ||
669 | if (fd < 0) { | |
670 | debug("%s: %s open failed: %s", __func__, name, strerror(errno)); | |
671 | return (-1); | |
672 | } | |
673 | ||
674 | debug("%s: %s mode %d fd %d", __func__, name, mode, fd); | |
675 | ||
676 | /* Set the tunnel device operation mode */ | |
677 | snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun); | |
678 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) | |
679 | goto failed; | |
680 | ||
681 | if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) | |
682 | goto failed; | |
683 | ||
684 | /* Set interface mode */ | |
685 | ifr.ifr_flags &= ~IFF_UP; | |
686 | if (mode == SSH_TUNMODE_ETHERNET) | |
687 | ifr.ifr_flags |= IFF_LINK0; | |
688 | else | |
689 | ifr.ifr_flags &= ~IFF_LINK0; | |
690 | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) | |
691 | goto failed; | |
692 | ||
693 | /* Bring interface up */ | |
694 | ifr.ifr_flags |= IFF_UP; | |
695 | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) | |
696 | goto failed; | |
697 | ||
698 | close(sock); | |
699 | return (fd); | |
700 | ||
701 | failed: | |
702 | if (fd >= 0) | |
703 | close(fd); | |
704 | if (sock >= 0) | |
705 | close(sock); | |
706 | debug("%s: failed to set %s mode %d: %s", __func__, name, | |
707 | mode, strerror(errno)); | |
708 | return (-1); | |
709 | #else | |
710 | error("Tunnel interfaces are not supported on this platform"); | |
711 | return (-1); | |
712 | #endif | |
713 | } | |
714 | ||
715 | void | |
716 | sanitise_stdfd(void) | |
717 | { | |
718 | int nullfd, dupfd; | |
719 | ||
720 | if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { | |
721 | fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno)); | |
722 | exit(1); | |
723 | } | |
724 | while (++dupfd <= 2) { | |
725 | /* Only clobber closed fds */ | |
726 | if (fcntl(dupfd, F_GETFL, 0) >= 0) | |
727 | continue; | |
728 | if (dup2(nullfd, dupfd) == -1) { | |
729 | fprintf(stderr, "dup2: %s", strerror(errno)); | |
730 | exit(1); | |
731 | } | |
732 | } | |
733 | if (nullfd > 2) | |
734 | close(nullfd); | |
735 | } | |
736 | ||
665a873d | 737 | char * |
9108f8d9 | 738 | tohex(const void *vp, size_t l) |
665a873d | 739 | { |
9108f8d9 | 740 | const u_char *p = (const u_char *)vp; |
665a873d | 741 | char b[3], *r; |
9108f8d9 | 742 | size_t i, hl; |
743 | ||
744 | if (l > 65536) | |
745 | return xstrdup("tohex: length > 65536"); | |
665a873d | 746 | |
747 | hl = l * 2 + 1; | |
9108f8d9 | 748 | r = xcalloc(1, hl); |
665a873d | 749 | for (i = 0; i < l; i++) { |
9108f8d9 | 750 | snprintf(b, sizeof(b), "%02x", p[i]); |
665a873d | 751 | strlcat(r, b, hl); |
752 | } | |
753 | return (r); | |
754 | } | |
755 | ||
9108f8d9 | 756 | u_int64_t |
757 | get_u64(const void *vp) | |
758 | { | |
759 | const u_char *p = (const u_char *)vp; | |
760 | u_int64_t v; | |
761 | ||
762 | v = (u_int64_t)p[0] << 56; | |
763 | v |= (u_int64_t)p[1] << 48; | |
764 | v |= (u_int64_t)p[2] << 40; | |
765 | v |= (u_int64_t)p[3] << 32; | |
766 | v |= (u_int64_t)p[4] << 24; | |
767 | v |= (u_int64_t)p[5] << 16; | |
768 | v |= (u_int64_t)p[6] << 8; | |
769 | v |= (u_int64_t)p[7]; | |
770 | ||
771 | return (v); | |
772 | } | |
773 | ||
774 | u_int32_t | |
775 | get_u32(const void *vp) | |
776 | { | |
777 | const u_char *p = (const u_char *)vp; | |
778 | u_int32_t v; | |
779 | ||
780 | v = (u_int32_t)p[0] << 24; | |
781 | v |= (u_int32_t)p[1] << 16; | |
782 | v |= (u_int32_t)p[2] << 8; | |
783 | v |= (u_int32_t)p[3]; | |
784 | ||
785 | return (v); | |
786 | } | |
787 | ||
788 | u_int16_t | |
789 | get_u16(const void *vp) | |
790 | { | |
791 | const u_char *p = (const u_char *)vp; | |
792 | u_int16_t v; | |
793 | ||
794 | v = (u_int16_t)p[0] << 8; | |
795 | v |= (u_int16_t)p[1]; | |
796 | ||
797 | return (v); | |
798 | } | |
799 | ||
800 | void | |
801 | put_u64(void *vp, u_int64_t v) | |
802 | { | |
803 | u_char *p = (u_char *)vp; | |
804 | ||
805 | p[0] = (u_char)(v >> 56) & 0xff; | |
806 | p[1] = (u_char)(v >> 48) & 0xff; | |
807 | p[2] = (u_char)(v >> 40) & 0xff; | |
808 | p[3] = (u_char)(v >> 32) & 0xff; | |
809 | p[4] = (u_char)(v >> 24) & 0xff; | |
810 | p[5] = (u_char)(v >> 16) & 0xff; | |
811 | p[6] = (u_char)(v >> 8) & 0xff; | |
812 | p[7] = (u_char)v & 0xff; | |
813 | } | |
814 | ||
815 | void | |
816 | put_u32(void *vp, u_int32_t v) | |
817 | { | |
818 | u_char *p = (u_char *)vp; | |
819 | ||
820 | p[0] = (u_char)(v >> 24) & 0xff; | |
821 | p[1] = (u_char)(v >> 16) & 0xff; | |
822 | p[2] = (u_char)(v >> 8) & 0xff; | |
823 | p[3] = (u_char)v & 0xff; | |
824 | } | |
825 | ||
826 | ||
827 | void | |
828 | put_u16(void *vp, u_int16_t v) | |
829 | { | |
830 | u_char *p = (u_char *)vp; | |
831 | ||
832 | p[0] = (u_char)(v >> 8) & 0xff; | |
833 | p[1] = (u_char)v & 0xff; | |
834 | } |