Annotation of src/usr.bin/ssh/misc.c, Revision 1.110
1.110 ! deraadt 1: /* $OpenBSD: misc.c,v 1.109 2017/03/14 00:55:37 dtucker Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.52 djm 4: * Copyright (c) 2005,2006 Damien Miller. All rights reserved.
1.1 markus 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:
1.64 deraadt 27: #include <sys/types.h>
1.45 stevesk 28: #include <sys/ioctl.h>
1.53 stevesk 29: #include <sys/socket.h>
1.101 dtucker 30: #include <sys/time.h>
1.94 millert 31: #include <sys/un.h>
1.38 stevesk 32:
33: #include <net/if.h>
1.53 stevesk 34: #include <netinet/in.h>
1.83 djm 35: #include <netinet/ip.h>
1.44 stevesk 36: #include <netinet/tcp.h>
1.43 stevesk 37:
1.92 djm 38: #include <ctype.h>
1.58 stevesk 39: #include <errno.h>
1.55 stevesk 40: #include <fcntl.h>
1.66 dtucker 41: #include <netdb.h>
1.43 stevesk 42: #include <paths.h>
1.54 stevesk 43: #include <pwd.h>
1.96 deraadt 44: #include <limits.h>
1.57 stevesk 45: #include <stdarg.h>
1.63 stevesk 46: #include <stdio.h>
1.62 stevesk 47: #include <stdlib.h>
1.60 stevesk 48: #include <string.h>
1.59 stevesk 49: #include <unistd.h>
1.1 markus 50:
1.64 deraadt 51: #include "xmalloc.h"
1.1 markus 52: #include "misc.h"
53: #include "log.h"
1.56 dtucker 54: #include "ssh.h"
1.1 markus 55:
1.12 markus 56: /* remove newline at end of string */
1.1 markus 57: char *
58: chop(char *s)
59: {
60: char *t = s;
61: while (*t) {
1.13 deraadt 62: if (*t == '\n' || *t == '\r') {
1.1 markus 63: *t = '\0';
64: return s;
65: }
66: t++;
67: }
68: return s;
69:
70: }
71:
1.12 markus 72: /* set/unset filedescriptor to non-blocking */
1.24 djm 73: int
1.1 markus 74: set_nonblock(int fd)
75: {
76: int val;
1.8 markus 77:
1.103 krw 78: val = fcntl(fd, F_GETFL);
1.1 markus 79: if (val < 0) {
1.103 krw 80: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 81: return (-1);
1.1 markus 82: }
83: if (val & O_NONBLOCK) {
1.24 djm 84: debug3("fd %d is O_NONBLOCK", fd);
85: return (0);
1.1 markus 86: }
1.21 markus 87: debug2("fd %d setting O_NONBLOCK", fd);
1.1 markus 88: val |= O_NONBLOCK;
1.24 djm 89: if (fcntl(fd, F_SETFL, val) == -1) {
90: debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
91: strerror(errno));
92: return (-1);
93: }
94: return (0);
1.8 markus 95: }
96:
1.24 djm 97: int
1.8 markus 98: unset_nonblock(int fd)
99: {
100: int val;
101:
1.103 krw 102: val = fcntl(fd, F_GETFL);
1.8 markus 103: if (val < 0) {
1.103 krw 104: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 105: return (-1);
1.8 markus 106: }
107: if (!(val & O_NONBLOCK)) {
1.24 djm 108: debug3("fd %d is not O_NONBLOCK", fd);
109: return (0);
1.8 markus 110: }
1.10 markus 111: debug("fd %d clearing O_NONBLOCK", fd);
1.8 markus 112: val &= ~O_NONBLOCK;
1.24 djm 113: if (fcntl(fd, F_SETFL, val) == -1) {
114: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
1.18 markus 115: fd, strerror(errno));
1.24 djm 116: return (-1);
117: }
118: return (0);
1.66 dtucker 119: }
120:
121: const char *
122: ssh_gai_strerror(int gaierr)
123: {
1.91 djm 124: if (gaierr == EAI_SYSTEM && errno != 0)
1.67 dtucker 125: return strerror(errno);
126: return gai_strerror(gaierr);
1.15 stevesk 127: }
128:
129: /* disable nagle on socket */
130: void
131: set_nodelay(int fd)
132: {
1.17 stevesk 133: int opt;
134: socklen_t optlen;
1.15 stevesk 135:
1.16 stevesk 136: optlen = sizeof opt;
137: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
1.23 markus 138: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
1.16 stevesk 139: return;
140: }
141: if (opt == 1) {
142: debug2("fd %d is TCP_NODELAY", fd);
143: return;
144: }
145: opt = 1;
1.20 markus 146: debug2("fd %d setting TCP_NODELAY", fd);
1.16 stevesk 147: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
1.15 stevesk 148: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.72 reyk 149: }
150:
1.1 markus 151: /* Characters considered whitespace in strsep calls. */
152: #define WHITESPACE " \t\r\n"
1.46 dtucker 153: #define QUOTE "\""
1.1 markus 154:
1.12 markus 155: /* return next token in configuration line */
1.1 markus 156: char *
157: strdelim(char **s)
158: {
159: char *old;
160: int wspace = 0;
161:
162: if (*s == NULL)
163: return NULL;
164:
165: old = *s;
166:
1.46 dtucker 167: *s = strpbrk(*s, WHITESPACE QUOTE "=");
1.1 markus 168: if (*s == NULL)
169: return (old);
170:
1.46 dtucker 171: if (*s[0] == '\"') {
172: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
173: /* Find matching quote */
174: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
175: return (NULL); /* no matching quote */
176: } else {
177: *s[0] = '\0';
1.77 djm 178: *s += strspn(*s + 1, WHITESPACE) + 1;
1.46 dtucker 179: return (old);
180: }
181: }
182:
1.1 markus 183: /* Allow only one '=' to be skipped */
184: if (*s[0] == '=')
185: wspace = 1;
186: *s[0] = '\0';
187:
1.46 dtucker 188: /* Skip any extra whitespace after first token */
1.1 markus 189: *s += strspn(*s + 1, WHITESPACE) + 1;
190: if (*s[0] == '=' && !wspace)
191: *s += strspn(*s + 1, WHITESPACE) + 1;
192:
193: return (old);
1.2 markus 194: }
195:
196: struct passwd *
197: pwcopy(struct passwd *pw)
198: {
1.49 djm 199: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 200:
1.2 markus 201: copy->pw_name = xstrdup(pw->pw_name);
202: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 203: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 204: copy->pw_uid = pw->pw_uid;
205: copy->pw_gid = pw->pw_gid;
1.11 markus 206: copy->pw_expire = pw->pw_expire;
207: copy->pw_change = pw->pw_change;
1.2 markus 208: copy->pw_class = xstrdup(pw->pw_class);
209: copy->pw_dir = xstrdup(pw->pw_dir);
210: copy->pw_shell = xstrdup(pw->pw_shell);
211: return copy;
1.5 stevesk 212: }
213:
1.12 markus 214: /*
215: * Convert ASCII string to TCP/IP port number.
1.70 djm 216: * Port must be >=0 and <=65535.
217: * Return -1 if invalid.
1.12 markus 218: */
219: int
220: a2port(const char *s)
1.5 stevesk 221: {
1.70 djm 222: long long port;
223: const char *errstr;
1.5 stevesk 224:
1.70 djm 225: port = strtonum(s, 0, 65535, &errstr);
226: if (errstr != NULL)
227: return -1;
228: return (int)port;
1.9 stevesk 229: }
230:
1.36 reyk 231: int
232: a2tun(const char *s, int *remote)
233: {
234: const char *errstr = NULL;
235: char *sp, *ep;
236: int tun;
237:
238: if (remote != NULL) {
1.37 reyk 239: *remote = SSH_TUNID_ANY;
1.36 reyk 240: sp = xstrdup(s);
241: if ((ep = strchr(sp, ':')) == NULL) {
1.89 djm 242: free(sp);
1.36 reyk 243: return (a2tun(s, NULL));
244: }
245: ep[0] = '\0'; ep++;
246: *remote = a2tun(ep, NULL);
247: tun = a2tun(sp, NULL);
1.89 djm 248: free(sp);
1.37 reyk 249: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 250: }
251:
252: if (strcasecmp(s, "any") == 0)
1.37 reyk 253: return (SSH_TUNID_ANY);
1.36 reyk 254:
1.37 reyk 255: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
256: if (errstr != NULL)
257: return (SSH_TUNID_ERR);
1.36 reyk 258:
259: return (tun);
260: }
261:
1.9 stevesk 262: #define SECONDS 1
263: #define MINUTES (SECONDS * 60)
264: #define HOURS (MINUTES * 60)
265: #define DAYS (HOURS * 24)
266: #define WEEKS (DAYS * 7)
267:
1.12 markus 268: /*
269: * Convert a time string into seconds; format is
270: * a sequence of:
271: * time[qualifier]
272: *
273: * Valid time qualifiers are:
274: * <none> seconds
275: * s|S seconds
276: * m|M minutes
277: * h|H hours
278: * d|D days
279: * w|W weeks
280: *
281: * Examples:
282: * 90m 90 minutes
283: * 1h30m 90 minutes
284: * 2d 2 days
285: * 1w 1 week
286: *
287: * Return -1 if time string is invalid.
288: */
289: long
290: convtime(const char *s)
1.9 stevesk 291: {
1.108 dtucker 292: long total, secs, multiplier = 1;
1.9 stevesk 293: const char *p;
294: char *endp;
295:
296: errno = 0;
297: total = 0;
298: p = s;
299:
300: if (p == NULL || *p == '\0')
301: return -1;
302:
303: while (*p) {
304: secs = strtol(p, &endp, 10);
305: if (p == endp ||
306: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
307: secs < 0)
308: return -1;
309:
310: switch (*endp++) {
311: case '\0':
312: endp--;
1.48 deraadt 313: break;
1.9 stevesk 314: case 's':
315: case 'S':
316: break;
317: case 'm':
318: case 'M':
1.108 dtucker 319: multiplier = MINUTES;
1.9 stevesk 320: break;
321: case 'h':
322: case 'H':
1.108 dtucker 323: multiplier = HOURS;
1.9 stevesk 324: break;
325: case 'd':
326: case 'D':
1.108 dtucker 327: multiplier = DAYS;
1.9 stevesk 328: break;
329: case 'w':
330: case 'W':
1.108 dtucker 331: multiplier = WEEKS;
1.9 stevesk 332: break;
333: default:
334: return -1;
335: }
1.109 dtucker 336: if (secs >= LONG_MAX / multiplier)
1.108 dtucker 337: return -1;
338: secs *= multiplier;
1.109 dtucker 339: if (total >= LONG_MAX - secs)
1.108 dtucker 340: return -1;
1.9 stevesk 341: total += secs;
342: if (total < 0)
343: return -1;
344: p = endp;
345: }
346:
347: return total;
1.56 dtucker 348: }
349:
350: /*
351: * Returns a standardized host+port identifier string.
352: * Caller must free returned string.
353: */
354: char *
355: put_host_port(const char *host, u_short port)
356: {
357: char *hoststr;
358:
359: if (port == 0 || port == SSH_DEFAULT_PORT)
360: return(xstrdup(host));
361: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
362: fatal("put_host_port: asprintf: %s", strerror(errno));
363: debug3("put_host_port: %s", hoststr);
364: return hoststr;
1.28 djm 365: }
366:
367: /*
368: * Search for next delimiter between hostnames/addresses and ports.
369: * Argument may be modified (for termination).
370: * Returns *cp if parsing succeeds.
371: * *cp is set to the start of the next delimiter, if one was found.
372: * If this is the last field, *cp is set to NULL.
373: */
374: char *
375: hpdelim(char **cp)
376: {
377: char *s, *old;
378:
379: if (cp == NULL || *cp == NULL)
380: return NULL;
381:
382: old = s = *cp;
383: if (*s == '[') {
384: if ((s = strchr(s, ']')) == NULL)
385: return NULL;
386: else
387: s++;
388: } else if ((s = strpbrk(s, ":/")) == NULL)
389: s = *cp + strlen(*cp); /* skip to end (see first case below) */
390:
391: switch (*s) {
392: case '\0':
393: *cp = NULL; /* no more fields*/
394: break;
1.29 deraadt 395:
1.28 djm 396: case ':':
397: case '/':
398: *s = '\0'; /* terminate */
399: *cp = s + 1;
400: break;
1.29 deraadt 401:
1.28 djm 402: default:
403: return NULL;
404: }
405:
406: return old;
1.6 mouring 407: }
408:
409: char *
410: cleanhostname(char *host)
411: {
412: if (*host == '[' && host[strlen(host) - 1] == ']') {
413: host[strlen(host) - 1] = '\0';
414: return (host + 1);
415: } else
416: return host;
417: }
418:
419: char *
420: colon(char *cp)
421: {
422: int flag = 0;
423:
424: if (*cp == ':') /* Leading colon is part of file name. */
1.76 djm 425: return NULL;
1.6 mouring 426: if (*cp == '[')
427: flag = 1;
428:
429: for (; *cp; ++cp) {
430: if (*cp == '@' && *(cp+1) == '[')
431: flag = 1;
432: if (*cp == ']' && *(cp+1) == ':' && flag)
433: return (cp+1);
434: if (*cp == ':' && !flag)
435: return (cp);
436: if (*cp == '/')
1.76 djm 437: return NULL;
1.6 mouring 438: }
1.76 djm 439: return NULL;
1.105 djm 440: }
441:
442: /*
443: * Parse a [user@]host[:port] string.
444: * Caller must free returned user and host.
445: * Any of the pointer return arguments may be NULL (useful for syntax checking).
446: * If user was not specified then *userp will be set to NULL.
447: * If port was not specified then *portp will be -1.
448: * Returns 0 on success, -1 on failure.
449: */
450: int
451: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
452: {
453: char *sdup, *cp, *tmp;
454: char *user = NULL, *host = NULL;
455: int port = -1, ret = -1;
456:
457: if (userp != NULL)
458: *userp = NULL;
459: if (hostp != NULL)
460: *hostp = NULL;
461: if (portp != NULL)
462: *portp = -1;
463:
464: if ((sdup = tmp = strdup(s)) == NULL)
465: return -1;
466: /* Extract optional username */
467: if ((cp = strchr(tmp, '@')) != NULL) {
468: *cp = '\0';
469: if (*tmp == '\0')
470: goto out;
471: if ((user = strdup(tmp)) == NULL)
472: goto out;
473: tmp = cp + 1;
474: }
475: /* Extract mandatory hostname */
476: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
477: goto out;
478: host = xstrdup(cleanhostname(cp));
479: /* Convert and verify optional port */
480: if (tmp != NULL && *tmp != '\0') {
481: if ((port = a2port(tmp)) <= 0)
482: goto out;
483: }
484: /* Success */
485: if (userp != NULL) {
486: *userp = user;
487: user = NULL;
488: }
489: if (hostp != NULL) {
490: *hostp = host;
491: host = NULL;
492: }
493: if (portp != NULL)
494: *portp = port;
495: ret = 0;
496: out:
497: free(sdup);
498: free(user);
499: free(host);
500: return ret;
1.7 mouring 501: }
502:
1.12 markus 503: /* function to assist building execv() arguments */
1.7 mouring 504: void
505: addargs(arglist *args, char *fmt, ...)
506: {
507: va_list ap;
1.42 djm 508: char *cp;
1.25 avsm 509: u_int nalloc;
1.42 djm 510: int r;
1.7 mouring 511:
512: va_start(ap, fmt);
1.42 djm 513: r = vasprintf(&cp, fmt, ap);
1.7 mouring 514: va_end(ap);
1.42 djm 515: if (r == -1)
516: fatal("addargs: argument too long");
1.7 mouring 517:
1.22 markus 518: nalloc = args->nalloc;
1.7 mouring 519: if (args->list == NULL) {
1.22 markus 520: nalloc = 32;
1.7 mouring 521: args->num = 0;
1.22 markus 522: } else if (args->num+2 >= nalloc)
523: nalloc *= 2;
1.7 mouring 524:
1.110 ! deraadt 525: args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *));
1.22 markus 526: args->nalloc = nalloc;
1.42 djm 527: args->list[args->num++] = cp;
1.7 mouring 528: args->list[args->num] = NULL;
1.42 djm 529: }
530:
531: void
532: replacearg(arglist *args, u_int which, char *fmt, ...)
533: {
534: va_list ap;
535: char *cp;
536: int r;
537:
538: va_start(ap, fmt);
539: r = vasprintf(&cp, fmt, ap);
540: va_end(ap);
541: if (r == -1)
542: fatal("replacearg: argument too long");
543:
544: if (which >= args->num)
545: fatal("replacearg: tried to replace invalid arg %d >= %d",
546: which, args->num);
1.89 djm 547: free(args->list[which]);
1.42 djm 548: args->list[which] = cp;
549: }
550:
551: void
552: freeargs(arglist *args)
553: {
554: u_int i;
555:
556: if (args->list != NULL) {
557: for (i = 0; i < args->num; i++)
1.89 djm 558: free(args->list[i]);
559: free(args->list);
1.42 djm 560: args->nalloc = args->num = 0;
561: args->list = NULL;
562: }
1.30 djm 563: }
564:
565: /*
566: * Expands tildes in the file name. Returns data allocated by xmalloc.
567: * Warning: this calls getpw*.
568: */
569: char *
570: tilde_expand_filename(const char *filename, uid_t uid)
571: {
1.87 tedu 572: const char *path, *sep;
573: char user[128], *ret;
1.30 djm 574: struct passwd *pw;
1.32 djm 575: u_int len, slash;
1.30 djm 576:
577: if (*filename != '~')
578: return (xstrdup(filename));
579: filename++;
580:
581: path = strchr(filename, '/');
582: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 583: slash = path - filename;
584: if (slash > sizeof(user) - 1)
1.30 djm 585: fatal("tilde_expand_filename: ~username too long");
1.32 djm 586: memcpy(user, filename, slash);
587: user[slash] = '\0';
1.30 djm 588: if ((pw = getpwnam(user)) == NULL)
589: fatal("tilde_expand_filename: No such user %s", user);
590: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
1.69 dtucker 591: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
1.30 djm 592:
593: /* Make sure directory has a trailing '/' */
594: len = strlen(pw->pw_dir);
1.88 tedu 595: if (len == 0 || pw->pw_dir[len - 1] != '/')
1.87 tedu 596: sep = "/";
597: else
598: sep = "";
1.30 djm 599:
600: /* Skip leading '/' from specified path */
601: if (path != NULL)
602: filename = path + 1;
1.87 tedu 603:
1.96 deraadt 604: if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX)
1.30 djm 605: fatal("tilde_expand_filename: Path too long");
606:
1.87 tedu 607: return (ret);
1.31 djm 608: }
609:
610: /*
611: * Expand a string with a set of %[char] escapes. A number of escapes may be
612: * specified as (char *escape_chars, char *replacement) pairs. The list must
1.34 dtucker 613: * be terminated by a NULL escape_char. Returns replaced string in memory
1.31 djm 614: * allocated by xmalloc.
615: */
616: char *
617: percent_expand(const char *string, ...)
618: {
619: #define EXPAND_MAX_KEYS 16
1.73 djm 620: u_int num_keys, i, j;
1.31 djm 621: struct {
622: const char *key;
623: const char *repl;
624: } keys[EXPAND_MAX_KEYS];
625: char buf[4096];
626: va_list ap;
627:
628: /* Gather keys */
629: va_start(ap, string);
630: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
631: keys[num_keys].key = va_arg(ap, char *);
632: if (keys[num_keys].key == NULL)
633: break;
634: keys[num_keys].repl = va_arg(ap, char *);
635: if (keys[num_keys].repl == NULL)
1.73 djm 636: fatal("%s: NULL replacement", __func__);
1.31 djm 637: }
1.73 djm 638: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
639: fatal("%s: too many keys", __func__);
1.31 djm 640: va_end(ap);
641:
642: /* Expand string */
643: *buf = '\0';
644: for (i = 0; *string != '\0'; string++) {
645: if (*string != '%') {
646: append:
647: buf[i++] = *string;
648: if (i >= sizeof(buf))
1.73 djm 649: fatal("%s: string too long", __func__);
1.31 djm 650: buf[i] = '\0';
651: continue;
652: }
653: string++;
1.73 djm 654: /* %% case */
1.31 djm 655: if (*string == '%')
656: goto append;
1.100 tobias 657: if (*string == '\0')
658: fatal("%s: invalid format", __func__);
1.31 djm 659: for (j = 0; j < num_keys; j++) {
660: if (strchr(keys[j].key, *string) != NULL) {
661: i = strlcat(buf, keys[j].repl, sizeof(buf));
662: if (i >= sizeof(buf))
1.73 djm 663: fatal("%s: string too long", __func__);
1.31 djm 664: break;
665: }
666: }
667: if (j >= num_keys)
1.73 djm 668: fatal("%s: unknown key %%%c", __func__, *string);
1.31 djm 669: }
670: return (xstrdup(buf));
671: #undef EXPAND_MAX_KEYS
1.26 dtucker 672: }
673:
674: /*
675: * Read an entire line from a public key file into a static buffer, discarding
676: * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
677: */
678: int
679: read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
1.27 dtucker 680: u_long *lineno)
1.26 dtucker 681: {
682: while (fgets(buf, bufsz, f) != NULL) {
1.65 ray 683: if (buf[0] == '\0')
684: continue;
1.26 dtucker 685: (*lineno)++;
686: if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
687: return 0;
688: } else {
1.27 dtucker 689: debug("%s: %s line %lu exceeds size limit", __func__,
690: filename, *lineno);
1.26 dtucker 691: /* discard remainder of line */
1.29 deraadt 692: while (fgetc(f) != '\n' && !feof(f))
1.26 dtucker 693: ; /* nothing */
694: }
695: }
696: return -1;
1.36 reyk 697: }
698:
699: int
1.37 reyk 700: tun_open(int tun, int mode)
1.36 reyk 701: {
1.37 reyk 702: struct ifreq ifr;
1.36 reyk 703: char name[100];
1.37 reyk 704: int fd = -1, sock;
1.99 sthen 705: const char *tunbase = "tun";
706:
707: if (mode == SSH_TUNMODE_ETHERNET)
708: tunbase = "tap";
1.36 reyk 709:
1.37 reyk 710: /* Open the tunnel device */
711: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 712: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 713: fd = open(name, O_RDWR);
714: } else if (tun == SSH_TUNID_ANY) {
715: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 716: snprintf(name, sizeof(name), "/dev/%s%d",
717: tunbase, tun);
1.37 reyk 718: if ((fd = open(name, O_RDWR)) >= 0)
719: break;
1.36 reyk 720: }
721: } else {
1.39 stevesk 722: debug("%s: invalid tunnel %u", __func__, tun);
1.98 djm 723: return -1;
1.37 reyk 724: }
725:
726: if (fd < 0) {
1.98 djm 727: debug("%s: %s open: %s", __func__, name, strerror(errno));
728: return -1;
1.36 reyk 729: }
1.37 reyk 730:
731: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
732:
1.99 sthen 733: /* Bring interface up if it is not already */
734: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
735: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 736: goto failed;
737:
1.98 djm 738: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
739: debug("%s: get interface %s flags: %s", __func__,
740: ifr.ifr_name, strerror(errno));
1.37 reyk 741: goto failed;
1.98 djm 742: }
1.40 reyk 743:
1.98 djm 744: if (!(ifr.ifr_flags & IFF_UP)) {
745: ifr.ifr_flags |= IFF_UP;
746: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
747: debug("%s: activate interface %s: %s", __func__,
748: ifr.ifr_name, strerror(errno));
749: goto failed;
750: }
751: }
1.37 reyk 752:
753: close(sock);
1.98 djm 754: return fd;
1.37 reyk 755:
756: failed:
757: if (fd >= 0)
758: close(fd);
759: if (sock >= 0)
760: close(sock);
1.98 djm 761: return -1;
1.35 djm 762: }
763:
764: void
765: sanitise_stdfd(void)
766: {
1.41 djm 767: int nullfd, dupfd;
1.35 djm 768:
1.41 djm 769: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 770: fprintf(stderr, "Couldn't open /dev/null: %s\n",
771: strerror(errno));
1.35 djm 772: exit(1);
773: }
1.103 krw 774: while (++dupfd <= STDERR_FILENO) {
775: /* Only populate closed fds. */
776: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
777: if (dup2(nullfd, dupfd) == -1) {
778: fprintf(stderr, "dup2: %s\n", strerror(errno));
779: exit(1);
780: }
1.35 djm 781: }
782: }
1.103 krw 783: if (nullfd > STDERR_FILENO)
1.35 djm 784: close(nullfd);
1.1 markus 785: }
1.33 djm 786:
787: char *
1.52 djm 788: tohex(const void *vp, size_t l)
1.33 djm 789: {
1.52 djm 790: const u_char *p = (const u_char *)vp;
1.33 djm 791: char b[3], *r;
1.52 djm 792: size_t i, hl;
793:
794: if (l > 65536)
795: return xstrdup("tohex: length > 65536");
1.33 djm 796:
797: hl = l * 2 + 1;
1.49 djm 798: r = xcalloc(1, hl);
1.33 djm 799: for (i = 0; i < l; i++) {
1.52 djm 800: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 801: strlcat(r, b, hl);
802: }
803: return (r);
804: }
805:
1.52 djm 806: u_int64_t
807: get_u64(const void *vp)
808: {
809: const u_char *p = (const u_char *)vp;
810: u_int64_t v;
811:
812: v = (u_int64_t)p[0] << 56;
813: v |= (u_int64_t)p[1] << 48;
814: v |= (u_int64_t)p[2] << 40;
815: v |= (u_int64_t)p[3] << 32;
816: v |= (u_int64_t)p[4] << 24;
817: v |= (u_int64_t)p[5] << 16;
818: v |= (u_int64_t)p[6] << 8;
819: v |= (u_int64_t)p[7];
820:
821: return (v);
822: }
823:
824: u_int32_t
825: get_u32(const void *vp)
826: {
827: const u_char *p = (const u_char *)vp;
828: u_int32_t v;
829:
830: v = (u_int32_t)p[0] << 24;
831: v |= (u_int32_t)p[1] << 16;
832: v |= (u_int32_t)p[2] << 8;
833: v |= (u_int32_t)p[3];
834:
835: return (v);
836: }
837:
1.93 djm 838: u_int32_t
839: get_u32_le(const void *vp)
840: {
841: const u_char *p = (const u_char *)vp;
842: u_int32_t v;
843:
844: v = (u_int32_t)p[0];
845: v |= (u_int32_t)p[1] << 8;
846: v |= (u_int32_t)p[2] << 16;
847: v |= (u_int32_t)p[3] << 24;
848:
849: return (v);
850: }
851:
1.52 djm 852: u_int16_t
853: get_u16(const void *vp)
854: {
855: const u_char *p = (const u_char *)vp;
856: u_int16_t v;
857:
858: v = (u_int16_t)p[0] << 8;
859: v |= (u_int16_t)p[1];
860:
861: return (v);
862: }
863:
864: void
865: put_u64(void *vp, u_int64_t v)
866: {
867: u_char *p = (u_char *)vp;
868:
869: p[0] = (u_char)(v >> 56) & 0xff;
870: p[1] = (u_char)(v >> 48) & 0xff;
871: p[2] = (u_char)(v >> 40) & 0xff;
872: p[3] = (u_char)(v >> 32) & 0xff;
873: p[4] = (u_char)(v >> 24) & 0xff;
874: p[5] = (u_char)(v >> 16) & 0xff;
875: p[6] = (u_char)(v >> 8) & 0xff;
876: p[7] = (u_char)v & 0xff;
877: }
878:
879: void
880: put_u32(void *vp, u_int32_t v)
881: {
882: u_char *p = (u_char *)vp;
883:
884: p[0] = (u_char)(v >> 24) & 0xff;
885: p[1] = (u_char)(v >> 16) & 0xff;
886: p[2] = (u_char)(v >> 8) & 0xff;
887: p[3] = (u_char)v & 0xff;
888: }
889:
1.93 djm 890: void
891: put_u32_le(void *vp, u_int32_t v)
892: {
893: u_char *p = (u_char *)vp;
894:
895: p[0] = (u_char)v & 0xff;
896: p[1] = (u_char)(v >> 8) & 0xff;
897: p[2] = (u_char)(v >> 16) & 0xff;
898: p[3] = (u_char)(v >> 24) & 0xff;
899: }
1.52 djm 900:
901: void
902: put_u16(void *vp, u_int16_t v)
903: {
904: u_char *p = (u_char *)vp;
905:
906: p[0] = (u_char)(v >> 8) & 0xff;
907: p[1] = (u_char)v & 0xff;
908: }
1.68 dtucker 909:
910: void
911: ms_subtract_diff(struct timeval *start, int *ms)
912: {
913: struct timeval diff, finish;
914:
915: gettimeofday(&finish, NULL);
916: timersub(&finish, start, &diff);
917: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
918: }
919:
920: void
921: ms_to_timeval(struct timeval *tv, int ms)
922: {
923: if (ms < 0)
924: ms = 0;
925: tv->tv_sec = ms / 1000;
926: tv->tv_usec = (ms % 1000) * 1000;
1.90 dtucker 927: }
928:
929: time_t
930: monotime(void)
931: {
932: struct timespec ts;
933:
934: if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
935: fatal("clock_gettime: %s", strerror(errno));
936:
937: return (ts.tv_sec);
1.102 dtucker 938: }
939:
940: double
941: monotime_double(void)
942: {
943: struct timespec ts;
944:
945: if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
946: fatal("clock_gettime: %s", strerror(errno));
947:
948: return (ts.tv_sec + (double)ts.tv_nsec / 1000000000);
1.81 djm 949: }
950:
951: void
952: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
953: {
954: bw->buflen = buflen;
955: bw->rate = kbps;
956: bw->thresh = bw->rate;
957: bw->lamt = 0;
958: timerclear(&bw->bwstart);
959: timerclear(&bw->bwend);
960: }
961:
962: /* Callback from read/write loop to insert bandwidth-limiting delays */
963: void
964: bandwidth_limit(struct bwlimit *bw, size_t read_len)
965: {
966: u_int64_t waitlen;
967: struct timespec ts, rm;
968:
969: if (!timerisset(&bw->bwstart)) {
970: gettimeofday(&bw->bwstart, NULL);
971: return;
972: }
973:
974: bw->lamt += read_len;
975: if (bw->lamt < bw->thresh)
976: return;
977:
978: gettimeofday(&bw->bwend, NULL);
979: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
980: if (!timerisset(&bw->bwend))
981: return;
982:
983: bw->lamt *= 8;
984: waitlen = (double)1000000L * bw->lamt / bw->rate;
985:
986: bw->bwstart.tv_sec = waitlen / 1000000L;
987: bw->bwstart.tv_usec = waitlen % 1000000L;
988:
989: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
990: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
991:
992: /* Adjust the wait time */
993: if (bw->bwend.tv_sec) {
994: bw->thresh /= 2;
995: if (bw->thresh < bw->buflen / 4)
996: bw->thresh = bw->buflen / 4;
997: } else if (bw->bwend.tv_usec < 10000) {
998: bw->thresh *= 2;
999: if (bw->thresh > bw->buflen * 8)
1000: bw->thresh = bw->buflen * 8;
1001: }
1002:
1003: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1004: while (nanosleep(&ts, &rm) == -1) {
1005: if (errno != EINTR)
1006: break;
1007: ts = rm;
1008: }
1009: }
1010:
1011: bw->lamt = 0;
1012: gettimeofday(&bw->bwstart, NULL);
1.84 djm 1013: }
1014:
1015: /* Make a template filename for mk[sd]temp() */
1016: void
1017: mktemp_proto(char *s, size_t len)
1018: {
1019: const char *tmpdir;
1020: int r;
1021:
1022: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1023: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1024: if (r > 0 && (size_t)r < len)
1025: return;
1026: }
1027: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1028: if (r < 0 || (size_t)r >= len)
1029: fatal("%s: template string too short", __func__);
1.68 dtucker 1030: }
1.83 djm 1031:
1032: static const struct {
1033: const char *name;
1034: int value;
1035: } ipqos[] = {
1036: { "af11", IPTOS_DSCP_AF11 },
1037: { "af12", IPTOS_DSCP_AF12 },
1038: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 1039: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 1040: { "af22", IPTOS_DSCP_AF22 },
1041: { "af23", IPTOS_DSCP_AF23 },
1042: { "af31", IPTOS_DSCP_AF31 },
1043: { "af32", IPTOS_DSCP_AF32 },
1044: { "af33", IPTOS_DSCP_AF33 },
1045: { "af41", IPTOS_DSCP_AF41 },
1046: { "af42", IPTOS_DSCP_AF42 },
1047: { "af43", IPTOS_DSCP_AF43 },
1048: { "cs0", IPTOS_DSCP_CS0 },
1049: { "cs1", IPTOS_DSCP_CS1 },
1050: { "cs2", IPTOS_DSCP_CS2 },
1051: { "cs3", IPTOS_DSCP_CS3 },
1052: { "cs4", IPTOS_DSCP_CS4 },
1053: { "cs5", IPTOS_DSCP_CS5 },
1054: { "cs6", IPTOS_DSCP_CS6 },
1055: { "cs7", IPTOS_DSCP_CS7 },
1056: { "ef", IPTOS_DSCP_EF },
1057: { "lowdelay", IPTOS_LOWDELAY },
1058: { "throughput", IPTOS_THROUGHPUT },
1059: { "reliability", IPTOS_RELIABILITY },
1060: { NULL, -1 }
1061: };
1062:
1063: int
1064: parse_ipqos(const char *cp)
1065: {
1066: u_int i;
1067: char *ep;
1068: long val;
1069:
1070: if (cp == NULL)
1071: return -1;
1072: for (i = 0; ipqos[i].name != NULL; i++) {
1073: if (strcasecmp(cp, ipqos[i].name) == 0)
1074: return ipqos[i].value;
1075: }
1076: /* Try parsing as an integer */
1077: val = strtol(cp, &ep, 0);
1078: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1079: return -1;
1080: return val;
1081: }
1082:
1.85 stevesk 1083: const char *
1084: iptos2str(int iptos)
1085: {
1086: int i;
1087: static char iptos_str[sizeof "0xff"];
1088:
1089: for (i = 0; ipqos[i].name != NULL; i++) {
1090: if (ipqos[i].value == iptos)
1091: return ipqos[i].name;
1092: }
1093: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1094: return iptos_str;
1.92 djm 1095: }
1096:
1097: void
1098: lowercase(char *s)
1099: {
1100: for (; *s; s++)
1101: *s = tolower((u_char)*s);
1.94 millert 1102: }
1103:
1104: int
1105: unix_listener(const char *path, int backlog, int unlink_first)
1106: {
1107: struct sockaddr_un sunaddr;
1108: int saved_errno, sock;
1109:
1110: memset(&sunaddr, 0, sizeof(sunaddr));
1111: sunaddr.sun_family = AF_UNIX;
1112: if (strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1113: error("%s: \"%s\" too long for Unix domain socket", __func__,
1114: path);
1115: errno = ENAMETOOLONG;
1116: return -1;
1117: }
1118:
1119: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1120: if (sock < 0) {
1121: saved_errno = errno;
1122: error("socket: %.100s", strerror(errno));
1123: errno = saved_errno;
1124: return -1;
1125: }
1126: if (unlink_first == 1) {
1127: if (unlink(path) != 0 && errno != ENOENT)
1128: error("unlink(%s): %.100s", path, strerror(errno));
1129: }
1130: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1131: saved_errno = errno;
1132: error("bind: %.100s", strerror(errno));
1133: close(sock);
1134: error("%s: cannot bind to path: %s", __func__, path);
1135: errno = saved_errno;
1136: return -1;
1137: }
1138: if (listen(sock, backlog) < 0) {
1139: saved_errno = errno;
1140: error("listen: %.100s", strerror(errno));
1141: close(sock);
1142: unlink(path);
1143: error("%s: cannot listen on path: %s", __func__, path);
1144: errno = saved_errno;
1145: return -1;
1146: }
1147: return sock;
1.85 stevesk 1148: }
1.104 djm 1149:
1150: /*
1151: * Compares two strings that maybe be NULL. Returns non-zero if strings
1152: * are both NULL or are identical, returns zero otherwise.
1153: */
1154: static int
1155: strcmp_maybe_null(const char *a, const char *b)
1156: {
1157: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1158: return 0;
1159: if (a != NULL && strcmp(a, b) != 0)
1160: return 0;
1161: return 1;
1162: }
1163:
1164: /*
1165: * Compare two forwards, returning non-zero if they are identical or
1166: * zero otherwise.
1167: */
1168: int
1169: forward_equals(const struct Forward *a, const struct Forward *b)
1170: {
1171: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1172: return 0;
1173: if (a->listen_port != b->listen_port)
1174: return 0;
1175: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1176: return 0;
1177: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1178: return 0;
1179: if (a->connect_port != b->connect_port)
1180: return 0;
1181: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1182: return 0;
1183: /* allocated_port and handle are not checked */
1184: return 1;
1185: }
1186:
1.106 dtucker 1187: /* returns 1 if bind to specified port by specified user is permitted */
1188: int
1189: bind_permitted(int port, uid_t uid)
1190: {
1191: if (port < IPPORT_RESERVED && uid != 0)
1192: return 0;
1.107 dtucker 1193: return 1;
1194: }
1195:
1196: /* returns 1 if process is already daemonized, 0 otherwise */
1197: int
1198: daemonized(void)
1199: {
1200: int fd;
1201:
1202: if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1203: close(fd);
1204: return 0; /* have controlling terminal */
1205: }
1206: if (getppid() != 1)
1207: return 0; /* parent is not init */
1208: if (getsid(0) != getpid())
1209: return 0; /* not session leader */
1210: debug3("already daemonized");
1.106 dtucker 1211: return 1;
1212: }
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