Annotation of src/usr.bin/ssh/misc.c, Revision 1.135
1.135 ! dtucker 1: /* $OpenBSD: misc.c,v 1.134 2018/11/16 03:26:01 djm 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>
1.112 djm 30: #include <sys/stat.h>
1.101 dtucker 31: #include <sys/time.h>
1.112 djm 32: #include <sys/wait.h>
1.94 millert 33: #include <sys/un.h>
1.38 stevesk 34:
35: #include <net/if.h>
1.53 stevesk 36: #include <netinet/in.h>
1.83 djm 37: #include <netinet/ip.h>
1.44 stevesk 38: #include <netinet/tcp.h>
1.133 naddy 39: #include <arpa/inet.h>
1.43 stevesk 40:
1.92 djm 41: #include <ctype.h>
1.58 stevesk 42: #include <errno.h>
1.55 stevesk 43: #include <fcntl.h>
1.66 dtucker 44: #include <netdb.h>
1.43 stevesk 45: #include <paths.h>
1.54 stevesk 46: #include <pwd.h>
1.112 djm 47: #include <libgen.h>
1.96 deraadt 48: #include <limits.h>
1.112 djm 49: #include <signal.h>
1.57 stevesk 50: #include <stdarg.h>
1.63 stevesk 51: #include <stdio.h>
1.62 stevesk 52: #include <stdlib.h>
1.60 stevesk 53: #include <string.h>
1.59 stevesk 54: #include <unistd.h>
1.1 markus 55:
1.64 deraadt 56: #include "xmalloc.h"
1.1 markus 57: #include "misc.h"
58: #include "log.h"
1.56 dtucker 59: #include "ssh.h"
1.112 djm 60: #include "sshbuf.h"
61: #include "ssherr.h"
1.1 markus 62:
1.12 markus 63: /* remove newline at end of string */
1.1 markus 64: char *
65: chop(char *s)
66: {
67: char *t = s;
68: while (*t) {
1.13 deraadt 69: if (*t == '\n' || *t == '\r') {
1.1 markus 70: *t = '\0';
71: return s;
72: }
73: t++;
74: }
75: return s;
76:
77: }
78:
1.12 markus 79: /* set/unset filedescriptor to non-blocking */
1.24 djm 80: int
1.1 markus 81: set_nonblock(int fd)
82: {
83: int val;
1.8 markus 84:
1.103 krw 85: val = fcntl(fd, F_GETFL);
1.1 markus 86: if (val < 0) {
1.103 krw 87: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 88: return (-1);
1.1 markus 89: }
90: if (val & O_NONBLOCK) {
1.24 djm 91: debug3("fd %d is O_NONBLOCK", fd);
92: return (0);
1.1 markus 93: }
1.21 markus 94: debug2("fd %d setting O_NONBLOCK", fd);
1.1 markus 95: val |= O_NONBLOCK;
1.24 djm 96: if (fcntl(fd, F_SETFL, val) == -1) {
97: debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
98: strerror(errno));
99: return (-1);
100: }
101: return (0);
1.8 markus 102: }
103:
1.24 djm 104: int
1.8 markus 105: unset_nonblock(int fd)
106: {
107: int val;
108:
1.103 krw 109: val = fcntl(fd, F_GETFL);
1.8 markus 110: if (val < 0) {
1.103 krw 111: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 112: return (-1);
1.8 markus 113: }
114: if (!(val & O_NONBLOCK)) {
1.24 djm 115: debug3("fd %d is not O_NONBLOCK", fd);
116: return (0);
1.8 markus 117: }
1.10 markus 118: debug("fd %d clearing O_NONBLOCK", fd);
1.8 markus 119: val &= ~O_NONBLOCK;
1.24 djm 120: if (fcntl(fd, F_SETFL, val) == -1) {
121: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
1.18 markus 122: fd, strerror(errno));
1.24 djm 123: return (-1);
124: }
125: return (0);
1.66 dtucker 126: }
127:
128: const char *
129: ssh_gai_strerror(int gaierr)
130: {
1.91 djm 131: if (gaierr == EAI_SYSTEM && errno != 0)
1.67 dtucker 132: return strerror(errno);
133: return gai_strerror(gaierr);
1.15 stevesk 134: }
135:
136: /* disable nagle on socket */
137: void
138: set_nodelay(int fd)
139: {
1.17 stevesk 140: int opt;
141: socklen_t optlen;
1.15 stevesk 142:
1.16 stevesk 143: optlen = sizeof opt;
144: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
1.23 markus 145: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
1.16 stevesk 146: return;
147: }
148: if (opt == 1) {
149: debug2("fd %d is TCP_NODELAY", fd);
150: return;
151: }
152: opt = 1;
1.20 markus 153: debug2("fd %d setting TCP_NODELAY", fd);
1.16 stevesk 154: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
1.15 stevesk 155: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.117 djm 156: }
157:
158: /* Allow local port reuse in TIME_WAIT */
159: int
160: set_reuseaddr(int fd)
161: {
162: int on = 1;
163:
164: if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
165: error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
166: return -1;
167: }
168: return 0;
169: }
170:
1.118 djm 171: /* Get/set routing domain */
172: char *
173: get_rdomain(int fd)
174: {
175: int rtable;
176: char *ret;
177: socklen_t len = sizeof(rtable);
178:
179: if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) {
180: error("Failed to get routing domain for fd %d: %s",
181: fd, strerror(errno));
182: return NULL;
183: }
184: xasprintf(&ret, "%d", rtable);
185: return ret;
186: }
187:
1.117 djm 188: int
189: set_rdomain(int fd, const char *name)
190: {
191: int rtable;
192: const char *errstr;
193:
194: if (name == NULL)
195: return 0; /* default table */
196:
197: rtable = (int)strtonum(name, 0, 255, &errstr);
198: if (errstr != NULL) {
199: /* Shouldn't happen */
200: error("Invalid routing domain \"%s\": %s", name, errstr);
201: return -1;
202: }
203: if (setsockopt(fd, SOL_SOCKET, SO_RTABLE,
204: &rtable, sizeof(rtable)) == -1) {
205: error("Failed to set routing domain %d on fd %d: %s",
206: rtable, fd, strerror(errno));
207: return -1;
208: }
209: return 0;
1.72 reyk 210: }
211:
1.1 markus 212: /* Characters considered whitespace in strsep calls. */
213: #define WHITESPACE " \t\r\n"
1.46 dtucker 214: #define QUOTE "\""
1.1 markus 215:
1.12 markus 216: /* return next token in configuration line */
1.129 djm 217: static char *
218: strdelim_internal(char **s, int split_equals)
1.1 markus 219: {
1.126 djm 220: char *old;
1.1 markus 221: int wspace = 0;
222:
223: if (*s == NULL)
224: return NULL;
225:
226: old = *s;
227:
1.129 djm 228: *s = strpbrk(*s,
229: split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE);
1.1 markus 230: if (*s == NULL)
231: return (old);
232:
1.46 dtucker 233: if (*s[0] == '\"') {
234: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
235: /* Find matching quote */
1.126 djm 236: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
237: return (NULL); /* no matching quote */
238: } else {
239: *s[0] = '\0';
240: *s += strspn(*s + 1, WHITESPACE) + 1;
241: return (old);
1.46 dtucker 242: }
243: }
244:
1.1 markus 245: /* Allow only one '=' to be skipped */
1.129 djm 246: if (split_equals && *s[0] == '=')
1.1 markus 247: wspace = 1;
248: *s[0] = '\0';
249:
1.46 dtucker 250: /* Skip any extra whitespace after first token */
1.1 markus 251: *s += strspn(*s + 1, WHITESPACE) + 1;
1.129 djm 252: if (split_equals && *s[0] == '=' && !wspace)
1.1 markus 253: *s += strspn(*s + 1, WHITESPACE) + 1;
254:
255: return (old);
1.129 djm 256: }
257:
258: /*
259: * Return next token in configuration line; splts on whitespace or a
260: * single '=' character.
261: */
262: char *
263: strdelim(char **s)
264: {
265: return strdelim_internal(s, 1);
266: }
267:
268: /*
269: * Return next token in configuration line; splts on whitespace only.
270: */
271: char *
272: strdelimw(char **s)
273: {
274: return strdelim_internal(s, 0);
1.2 markus 275: }
276:
277: struct passwd *
278: pwcopy(struct passwd *pw)
279: {
1.49 djm 280: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 281:
1.2 markus 282: copy->pw_name = xstrdup(pw->pw_name);
283: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 284: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 285: copy->pw_uid = pw->pw_uid;
286: copy->pw_gid = pw->pw_gid;
1.11 markus 287: copy->pw_expire = pw->pw_expire;
288: copy->pw_change = pw->pw_change;
1.2 markus 289: copy->pw_class = xstrdup(pw->pw_class);
290: copy->pw_dir = xstrdup(pw->pw_dir);
291: copy->pw_shell = xstrdup(pw->pw_shell);
292: return copy;
1.5 stevesk 293: }
294:
1.12 markus 295: /*
296: * Convert ASCII string to TCP/IP port number.
1.70 djm 297: * Port must be >=0 and <=65535.
298: * Return -1 if invalid.
1.12 markus 299: */
300: int
301: a2port(const char *s)
1.5 stevesk 302: {
1.133 naddy 303: struct servent *se;
1.70 djm 304: long long port;
305: const char *errstr;
1.5 stevesk 306:
1.70 djm 307: port = strtonum(s, 0, 65535, &errstr);
1.133 naddy 308: if (errstr == NULL)
309: return (int)port;
310: if ((se = getservbyname(s, "tcp")) != NULL)
311: return ntohs(se->s_port);
312: return -1;
1.9 stevesk 313: }
314:
1.36 reyk 315: int
316: a2tun(const char *s, int *remote)
317: {
318: const char *errstr = NULL;
319: char *sp, *ep;
320: int tun;
321:
322: if (remote != NULL) {
1.37 reyk 323: *remote = SSH_TUNID_ANY;
1.36 reyk 324: sp = xstrdup(s);
325: if ((ep = strchr(sp, ':')) == NULL) {
1.89 djm 326: free(sp);
1.36 reyk 327: return (a2tun(s, NULL));
328: }
329: ep[0] = '\0'; ep++;
330: *remote = a2tun(ep, NULL);
331: tun = a2tun(sp, NULL);
1.89 djm 332: free(sp);
1.37 reyk 333: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 334: }
335:
336: if (strcasecmp(s, "any") == 0)
1.37 reyk 337: return (SSH_TUNID_ANY);
1.36 reyk 338:
1.37 reyk 339: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
340: if (errstr != NULL)
341: return (SSH_TUNID_ERR);
1.36 reyk 342:
343: return (tun);
344: }
345:
1.9 stevesk 346: #define SECONDS 1
347: #define MINUTES (SECONDS * 60)
348: #define HOURS (MINUTES * 60)
349: #define DAYS (HOURS * 24)
350: #define WEEKS (DAYS * 7)
351:
1.12 markus 352: /*
353: * Convert a time string into seconds; format is
354: * a sequence of:
355: * time[qualifier]
356: *
357: * Valid time qualifiers are:
358: * <none> seconds
359: * s|S seconds
360: * m|M minutes
361: * h|H hours
362: * d|D days
363: * w|W weeks
364: *
365: * Examples:
366: * 90m 90 minutes
367: * 1h30m 90 minutes
368: * 2d 2 days
369: * 1w 1 week
370: *
371: * Return -1 if time string is invalid.
372: */
373: long
374: convtime(const char *s)
1.9 stevesk 375: {
1.108 dtucker 376: long total, secs, multiplier = 1;
1.9 stevesk 377: const char *p;
378: char *endp;
379:
380: errno = 0;
381: total = 0;
382: p = s;
383:
384: if (p == NULL || *p == '\0')
385: return -1;
386:
387: while (*p) {
388: secs = strtol(p, &endp, 10);
389: if (p == endp ||
390: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
391: secs < 0)
392: return -1;
393:
394: switch (*endp++) {
395: case '\0':
396: endp--;
1.48 deraadt 397: break;
1.9 stevesk 398: case 's':
399: case 'S':
400: break;
401: case 'm':
402: case 'M':
1.108 dtucker 403: multiplier = MINUTES;
1.9 stevesk 404: break;
405: case 'h':
406: case 'H':
1.108 dtucker 407: multiplier = HOURS;
1.9 stevesk 408: break;
409: case 'd':
410: case 'D':
1.108 dtucker 411: multiplier = DAYS;
1.9 stevesk 412: break;
413: case 'w':
414: case 'W':
1.108 dtucker 415: multiplier = WEEKS;
1.9 stevesk 416: break;
417: default:
418: return -1;
419: }
1.109 dtucker 420: if (secs >= LONG_MAX / multiplier)
1.108 dtucker 421: return -1;
422: secs *= multiplier;
1.109 dtucker 423: if (total >= LONG_MAX - secs)
1.108 dtucker 424: return -1;
1.9 stevesk 425: total += secs;
426: if (total < 0)
427: return -1;
428: p = endp;
429: }
430:
431: return total;
1.56 dtucker 432: }
433:
434: /*
435: * Returns a standardized host+port identifier string.
436: * Caller must free returned string.
437: */
438: char *
439: put_host_port(const char *host, u_short port)
440: {
441: char *hoststr;
442:
443: if (port == 0 || port == SSH_DEFAULT_PORT)
444: return(xstrdup(host));
445: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
446: fatal("put_host_port: asprintf: %s", strerror(errno));
447: debug3("put_host_port: %s", hoststr);
448: return hoststr;
1.28 djm 449: }
450:
451: /*
452: * Search for next delimiter between hostnames/addresses and ports.
453: * Argument may be modified (for termination).
454: * Returns *cp if parsing succeeds.
1.114 millert 455: * *cp is set to the start of the next field, if one was found.
456: * The delimiter char, if present, is stored in delim.
1.28 djm 457: * If this is the last field, *cp is set to NULL.
458: */
1.114 millert 459: static char *
460: hpdelim2(char **cp, char *delim)
1.28 djm 461: {
462: char *s, *old;
463:
464: if (cp == NULL || *cp == NULL)
465: return NULL;
466:
467: old = s = *cp;
468: if (*s == '[') {
469: if ((s = strchr(s, ']')) == NULL)
470: return NULL;
471: else
472: s++;
473: } else if ((s = strpbrk(s, ":/")) == NULL)
474: s = *cp + strlen(*cp); /* skip to end (see first case below) */
475:
476: switch (*s) {
477: case '\0':
478: *cp = NULL; /* no more fields*/
479: break;
1.29 deraadt 480:
1.28 djm 481: case ':':
482: case '/':
1.114 millert 483: if (delim != NULL)
484: *delim = *s;
1.28 djm 485: *s = '\0'; /* terminate */
486: *cp = s + 1;
487: break;
1.29 deraadt 488:
1.28 djm 489: default:
490: return NULL;
491: }
492:
493: return old;
1.6 mouring 494: }
495:
496: char *
1.114 millert 497: hpdelim(char **cp)
498: {
499: return hpdelim2(cp, NULL);
500: }
501:
502: char *
1.6 mouring 503: cleanhostname(char *host)
504: {
505: if (*host == '[' && host[strlen(host) - 1] == ']') {
506: host[strlen(host) - 1] = '\0';
507: return (host + 1);
508: } else
509: return host;
510: }
511:
512: char *
513: colon(char *cp)
514: {
515: int flag = 0;
516:
517: if (*cp == ':') /* Leading colon is part of file name. */
1.76 djm 518: return NULL;
1.6 mouring 519: if (*cp == '[')
520: flag = 1;
521:
522: for (; *cp; ++cp) {
523: if (*cp == '@' && *(cp+1) == '[')
524: flag = 1;
525: if (*cp == ']' && *(cp+1) == ':' && flag)
526: return (cp+1);
527: if (*cp == ':' && !flag)
528: return (cp);
529: if (*cp == '/')
1.76 djm 530: return NULL;
1.6 mouring 531: }
1.76 djm 532: return NULL;
1.105 djm 533: }
534:
535: /*
1.114 millert 536: * Parse a [user@]host:[path] string.
537: * Caller must free returned user, host and path.
538: * Any of the pointer return arguments may be NULL (useful for syntax checking).
539: * If user was not specified then *userp will be set to NULL.
540: * If host was not specified then *hostp will be set to NULL.
541: * If path was not specified then *pathp will be set to ".".
542: * Returns 0 on success, -1 on failure.
543: */
544: int
545: parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
546: {
547: char *user = NULL, *host = NULL, *path = NULL;
548: char *sdup, *tmp;
549: int ret = -1;
550:
551: if (userp != NULL)
552: *userp = NULL;
553: if (hostp != NULL)
554: *hostp = NULL;
555: if (pathp != NULL)
556: *pathp = NULL;
557:
1.116 millert 558: sdup = xstrdup(s);
1.114 millert 559:
560: /* Check for remote syntax: [user@]host:[path] */
561: if ((tmp = colon(sdup)) == NULL)
562: goto out;
563:
564: /* Extract optional path */
565: *tmp++ = '\0';
566: if (*tmp == '\0')
567: tmp = ".";
568: path = xstrdup(tmp);
569:
570: /* Extract optional user and mandatory host */
571: tmp = strrchr(sdup, '@');
572: if (tmp != NULL) {
573: *tmp++ = '\0';
574: host = xstrdup(cleanhostname(tmp));
575: if (*sdup != '\0')
576: user = xstrdup(sdup);
577: } else {
578: host = xstrdup(cleanhostname(sdup));
579: user = NULL;
580: }
581:
582: /* Success */
583: if (userp != NULL) {
584: *userp = user;
585: user = NULL;
586: }
587: if (hostp != NULL) {
588: *hostp = host;
589: host = NULL;
1.116 millert 590: }
1.114 millert 591: if (pathp != NULL) {
592: *pathp = path;
593: path = NULL;
1.116 millert 594: }
1.114 millert 595: ret = 0;
596: out:
597: free(sdup);
598: free(user);
599: free(host);
600: free(path);
601: return ret;
602: }
603:
604: /*
1.105 djm 605: * Parse a [user@]host[:port] string.
606: * Caller must free returned user and host.
607: * Any of the pointer return arguments may be NULL (useful for syntax checking).
608: * If user was not specified then *userp will be set to NULL.
609: * If port was not specified then *portp will be -1.
610: * Returns 0 on success, -1 on failure.
611: */
612: int
613: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
614: {
615: char *sdup, *cp, *tmp;
616: char *user = NULL, *host = NULL;
617: int port = -1, ret = -1;
618:
619: if (userp != NULL)
620: *userp = NULL;
621: if (hostp != NULL)
622: *hostp = NULL;
623: if (portp != NULL)
624: *portp = -1;
625:
626: if ((sdup = tmp = strdup(s)) == NULL)
627: return -1;
628: /* Extract optional username */
1.114 millert 629: if ((cp = strrchr(tmp, '@')) != NULL) {
1.105 djm 630: *cp = '\0';
631: if (*tmp == '\0')
632: goto out;
633: if ((user = strdup(tmp)) == NULL)
634: goto out;
635: tmp = cp + 1;
636: }
637: /* Extract mandatory hostname */
638: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
639: goto out;
640: host = xstrdup(cleanhostname(cp));
641: /* Convert and verify optional port */
642: if (tmp != NULL && *tmp != '\0') {
643: if ((port = a2port(tmp)) <= 0)
644: goto out;
645: }
646: /* Success */
647: if (userp != NULL) {
648: *userp = user;
649: user = NULL;
650: }
651: if (hostp != NULL) {
652: *hostp = host;
653: host = NULL;
654: }
655: if (portp != NULL)
656: *portp = port;
657: ret = 0;
658: out:
659: free(sdup);
660: free(user);
661: free(host);
662: return ret;
1.7 mouring 663: }
664:
1.114 millert 665: /*
666: * Converts a two-byte hex string to decimal.
667: * Returns the decimal value or -1 for invalid input.
668: */
669: static int
670: hexchar(const char *s)
671: {
672: unsigned char result[2];
673: int i;
674:
675: for (i = 0; i < 2; i++) {
676: if (s[i] >= '0' && s[i] <= '9')
677: result[i] = (unsigned char)(s[i] - '0');
678: else if (s[i] >= 'a' && s[i] <= 'f')
679: result[i] = (unsigned char)(s[i] - 'a') + 10;
680: else if (s[i] >= 'A' && s[i] <= 'F')
681: result[i] = (unsigned char)(s[i] - 'A') + 10;
682: else
683: return -1;
684: }
685: return (result[0] << 4) | result[1];
686: }
687:
688: /*
689: * Decode an url-encoded string.
690: * Returns a newly allocated string on success or NULL on failure.
691: */
692: static char *
693: urldecode(const char *src)
694: {
695: char *ret, *dst;
696: int ch;
697:
698: ret = xmalloc(strlen(src) + 1);
699: for (dst = ret; *src != '\0'; src++) {
700: switch (*src) {
701: case '+':
702: *dst++ = ' ';
703: break;
704: case '%':
705: if (!isxdigit((unsigned char)src[1]) ||
706: !isxdigit((unsigned char)src[2]) ||
707: (ch = hexchar(src + 1)) == -1) {
708: free(ret);
709: return NULL;
710: }
711: *dst++ = ch;
712: src += 2;
713: break;
714: default:
715: *dst++ = *src;
716: break;
717: }
718: }
719: *dst = '\0';
720:
721: return ret;
722: }
723:
724: /*
725: * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
726: * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
727: * Either user or path may be url-encoded (but not host or port).
728: * Caller must free returned user, host and path.
729: * Any of the pointer return arguments may be NULL (useful for syntax checking)
730: * but the scheme must always be specified.
731: * If user was not specified then *userp will be set to NULL.
732: * If port was not specified then *portp will be -1.
733: * If path was not specified then *pathp will be set to NULL.
734: * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
735: */
736: int
737: parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
738: int *portp, char **pathp)
739: {
740: char *uridup, *cp, *tmp, ch;
741: char *user = NULL, *host = NULL, *path = NULL;
742: int port = -1, ret = -1;
743: size_t len;
744:
745: len = strlen(scheme);
746: if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
747: return 1;
748: uri += len + 3;
749:
750: if (userp != NULL)
751: *userp = NULL;
752: if (hostp != NULL)
753: *hostp = NULL;
754: if (portp != NULL)
755: *portp = -1;
756: if (pathp != NULL)
757: *pathp = NULL;
758:
759: uridup = tmp = xstrdup(uri);
760:
761: /* Extract optional ssh-info (username + connection params) */
762: if ((cp = strchr(tmp, '@')) != NULL) {
763: char *delim;
764:
765: *cp = '\0';
766: /* Extract username and connection params */
767: if ((delim = strchr(tmp, ';')) != NULL) {
768: /* Just ignore connection params for now */
769: *delim = '\0';
770: }
771: if (*tmp == '\0') {
772: /* Empty username */
773: goto out;
774: }
775: if ((user = urldecode(tmp)) == NULL)
776: goto out;
777: tmp = cp + 1;
778: }
779:
780: /* Extract mandatory hostname */
781: if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
782: goto out;
783: host = xstrdup(cleanhostname(cp));
784: if (!valid_domain(host, 0, NULL))
785: goto out;
786:
787: if (tmp != NULL && *tmp != '\0') {
788: if (ch == ':') {
789: /* Convert and verify port. */
790: if ((cp = strchr(tmp, '/')) != NULL)
791: *cp = '\0';
792: if ((port = a2port(tmp)) <= 0)
793: goto out;
794: tmp = cp ? cp + 1 : NULL;
795: }
796: if (tmp != NULL && *tmp != '\0') {
797: /* Extract optional path */
798: if ((path = urldecode(tmp)) == NULL)
799: goto out;
800: }
801: }
802:
803: /* Success */
804: if (userp != NULL) {
805: *userp = user;
806: user = NULL;
807: }
808: if (hostp != NULL) {
809: *hostp = host;
810: host = NULL;
811: }
812: if (portp != NULL)
813: *portp = port;
814: if (pathp != NULL) {
815: *pathp = path;
816: path = NULL;
817: }
818: ret = 0;
819: out:
820: free(uridup);
821: free(user);
822: free(host);
823: free(path);
824: return ret;
825: }
826:
1.12 markus 827: /* function to assist building execv() arguments */
1.7 mouring 828: void
829: addargs(arglist *args, char *fmt, ...)
830: {
831: va_list ap;
1.42 djm 832: char *cp;
1.25 avsm 833: u_int nalloc;
1.42 djm 834: int r;
1.7 mouring 835:
836: va_start(ap, fmt);
1.42 djm 837: r = vasprintf(&cp, fmt, ap);
1.7 mouring 838: va_end(ap);
1.42 djm 839: if (r == -1)
840: fatal("addargs: argument too long");
1.7 mouring 841:
1.22 markus 842: nalloc = args->nalloc;
1.7 mouring 843: if (args->list == NULL) {
1.22 markus 844: nalloc = 32;
1.7 mouring 845: args->num = 0;
1.22 markus 846: } else if (args->num+2 >= nalloc)
847: nalloc *= 2;
1.7 mouring 848:
1.110 deraadt 849: args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *));
1.22 markus 850: args->nalloc = nalloc;
1.42 djm 851: args->list[args->num++] = cp;
1.7 mouring 852: args->list[args->num] = NULL;
1.42 djm 853: }
854:
855: void
856: replacearg(arglist *args, u_int which, char *fmt, ...)
857: {
858: va_list ap;
859: char *cp;
860: int r;
861:
862: va_start(ap, fmt);
863: r = vasprintf(&cp, fmt, ap);
864: va_end(ap);
865: if (r == -1)
866: fatal("replacearg: argument too long");
867:
868: if (which >= args->num)
869: fatal("replacearg: tried to replace invalid arg %d >= %d",
870: which, args->num);
1.89 djm 871: free(args->list[which]);
1.42 djm 872: args->list[which] = cp;
873: }
874:
875: void
876: freeargs(arglist *args)
877: {
878: u_int i;
879:
880: if (args->list != NULL) {
881: for (i = 0; i < args->num; i++)
1.89 djm 882: free(args->list[i]);
883: free(args->list);
1.42 djm 884: args->nalloc = args->num = 0;
885: args->list = NULL;
886: }
1.30 djm 887: }
888:
889: /*
890: * Expands tildes in the file name. Returns data allocated by xmalloc.
891: * Warning: this calls getpw*.
892: */
893: char *
894: tilde_expand_filename(const char *filename, uid_t uid)
895: {
1.87 tedu 896: const char *path, *sep;
897: char user[128], *ret;
1.30 djm 898: struct passwd *pw;
1.32 djm 899: u_int len, slash;
1.30 djm 900:
901: if (*filename != '~')
902: return (xstrdup(filename));
903: filename++;
904:
905: path = strchr(filename, '/');
906: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 907: slash = path - filename;
908: if (slash > sizeof(user) - 1)
1.30 djm 909: fatal("tilde_expand_filename: ~username too long");
1.32 djm 910: memcpy(user, filename, slash);
911: user[slash] = '\0';
1.30 djm 912: if ((pw = getpwnam(user)) == NULL)
913: fatal("tilde_expand_filename: No such user %s", user);
914: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
1.69 dtucker 915: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
1.30 djm 916:
917: /* Make sure directory has a trailing '/' */
918: len = strlen(pw->pw_dir);
1.88 tedu 919: if (len == 0 || pw->pw_dir[len - 1] != '/')
1.87 tedu 920: sep = "/";
921: else
922: sep = "";
1.30 djm 923:
924: /* Skip leading '/' from specified path */
925: if (path != NULL)
926: filename = path + 1;
1.87 tedu 927:
1.96 deraadt 928: if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX)
1.30 djm 929: fatal("tilde_expand_filename: Path too long");
930:
1.87 tedu 931: return (ret);
1.31 djm 932: }
933:
934: /*
935: * Expand a string with a set of %[char] escapes. A number of escapes may be
936: * specified as (char *escape_chars, char *replacement) pairs. The list must
1.34 dtucker 937: * be terminated by a NULL escape_char. Returns replaced string in memory
1.31 djm 938: * allocated by xmalloc.
939: */
940: char *
941: percent_expand(const char *string, ...)
942: {
943: #define EXPAND_MAX_KEYS 16
1.73 djm 944: u_int num_keys, i, j;
1.31 djm 945: struct {
946: const char *key;
947: const char *repl;
948: } keys[EXPAND_MAX_KEYS];
949: char buf[4096];
950: va_list ap;
951:
952: /* Gather keys */
953: va_start(ap, string);
954: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
955: keys[num_keys].key = va_arg(ap, char *);
956: if (keys[num_keys].key == NULL)
957: break;
958: keys[num_keys].repl = va_arg(ap, char *);
959: if (keys[num_keys].repl == NULL)
1.73 djm 960: fatal("%s: NULL replacement", __func__);
1.31 djm 961: }
1.73 djm 962: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
963: fatal("%s: too many keys", __func__);
1.31 djm 964: va_end(ap);
965:
966: /* Expand string */
967: *buf = '\0';
968: for (i = 0; *string != '\0'; string++) {
969: if (*string != '%') {
970: append:
971: buf[i++] = *string;
972: if (i >= sizeof(buf))
1.73 djm 973: fatal("%s: string too long", __func__);
1.31 djm 974: buf[i] = '\0';
975: continue;
976: }
977: string++;
1.73 djm 978: /* %% case */
1.31 djm 979: if (*string == '%')
980: goto append;
1.100 tobias 981: if (*string == '\0')
982: fatal("%s: invalid format", __func__);
1.31 djm 983: for (j = 0; j < num_keys; j++) {
984: if (strchr(keys[j].key, *string) != NULL) {
985: i = strlcat(buf, keys[j].repl, sizeof(buf));
986: if (i >= sizeof(buf))
1.73 djm 987: fatal("%s: string too long", __func__);
1.31 djm 988: break;
989: }
990: }
991: if (j >= num_keys)
1.73 djm 992: fatal("%s: unknown key %%%c", __func__, *string);
1.31 djm 993: }
994: return (xstrdup(buf));
995: #undef EXPAND_MAX_KEYS
1.36 reyk 996: }
997:
998: int
1.115 djm 999: tun_open(int tun, int mode, char **ifname)
1.36 reyk 1000: {
1.37 reyk 1001: struct ifreq ifr;
1.36 reyk 1002: char name[100];
1.37 reyk 1003: int fd = -1, sock;
1.99 sthen 1004: const char *tunbase = "tun";
1005:
1.115 djm 1006: if (ifname != NULL)
1007: *ifname = NULL;
1008:
1.99 sthen 1009: if (mode == SSH_TUNMODE_ETHERNET)
1010: tunbase = "tap";
1.36 reyk 1011:
1.37 reyk 1012: /* Open the tunnel device */
1013: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 1014: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 1015: fd = open(name, O_RDWR);
1016: } else if (tun == SSH_TUNID_ANY) {
1017: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 1018: snprintf(name, sizeof(name), "/dev/%s%d",
1019: tunbase, tun);
1.37 reyk 1020: if ((fd = open(name, O_RDWR)) >= 0)
1021: break;
1.36 reyk 1022: }
1023: } else {
1.39 stevesk 1024: debug("%s: invalid tunnel %u", __func__, tun);
1.98 djm 1025: return -1;
1.37 reyk 1026: }
1027:
1028: if (fd < 0) {
1.98 djm 1029: debug("%s: %s open: %s", __func__, name, strerror(errno));
1030: return -1;
1.36 reyk 1031: }
1.37 reyk 1032:
1033: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
1034:
1.99 sthen 1035: /* Bring interface up if it is not already */
1036: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
1037: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 1038: goto failed;
1039:
1.98 djm 1040: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
1041: debug("%s: get interface %s flags: %s", __func__,
1042: ifr.ifr_name, strerror(errno));
1.37 reyk 1043: goto failed;
1.98 djm 1044: }
1.40 reyk 1045:
1.98 djm 1046: if (!(ifr.ifr_flags & IFF_UP)) {
1047: ifr.ifr_flags |= IFF_UP;
1048: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
1049: debug("%s: activate interface %s: %s", __func__,
1050: ifr.ifr_name, strerror(errno));
1051: goto failed;
1052: }
1053: }
1.115 djm 1054:
1055: if (ifname != NULL)
1056: *ifname = xstrdup(ifr.ifr_name);
1.37 reyk 1057:
1058: close(sock);
1.98 djm 1059: return fd;
1.37 reyk 1060:
1061: failed:
1062: if (fd >= 0)
1063: close(fd);
1064: if (sock >= 0)
1065: close(sock);
1.98 djm 1066: return -1;
1.35 djm 1067: }
1068:
1069: void
1070: sanitise_stdfd(void)
1071: {
1.41 djm 1072: int nullfd, dupfd;
1.35 djm 1073:
1.41 djm 1074: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 1075: fprintf(stderr, "Couldn't open /dev/null: %s\n",
1076: strerror(errno));
1.35 djm 1077: exit(1);
1078: }
1.103 krw 1079: while (++dupfd <= STDERR_FILENO) {
1080: /* Only populate closed fds. */
1081: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
1082: if (dup2(nullfd, dupfd) == -1) {
1083: fprintf(stderr, "dup2: %s\n", strerror(errno));
1084: exit(1);
1085: }
1.35 djm 1086: }
1087: }
1.103 krw 1088: if (nullfd > STDERR_FILENO)
1.35 djm 1089: close(nullfd);
1.1 markus 1090: }
1.33 djm 1091:
1092: char *
1.52 djm 1093: tohex(const void *vp, size_t l)
1.33 djm 1094: {
1.52 djm 1095: const u_char *p = (const u_char *)vp;
1.33 djm 1096: char b[3], *r;
1.52 djm 1097: size_t i, hl;
1098:
1099: if (l > 65536)
1100: return xstrdup("tohex: length > 65536");
1.33 djm 1101:
1102: hl = l * 2 + 1;
1.49 djm 1103: r = xcalloc(1, hl);
1.33 djm 1104: for (i = 0; i < l; i++) {
1.52 djm 1105: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 1106: strlcat(r, b, hl);
1107: }
1108: return (r);
1109: }
1110:
1.52 djm 1111: u_int64_t
1112: get_u64(const void *vp)
1113: {
1114: const u_char *p = (const u_char *)vp;
1115: u_int64_t v;
1116:
1117: v = (u_int64_t)p[0] << 56;
1118: v |= (u_int64_t)p[1] << 48;
1119: v |= (u_int64_t)p[2] << 40;
1120: v |= (u_int64_t)p[3] << 32;
1121: v |= (u_int64_t)p[4] << 24;
1122: v |= (u_int64_t)p[5] << 16;
1123: v |= (u_int64_t)p[6] << 8;
1124: v |= (u_int64_t)p[7];
1125:
1126: return (v);
1127: }
1128:
1129: u_int32_t
1130: get_u32(const void *vp)
1131: {
1132: const u_char *p = (const u_char *)vp;
1133: u_int32_t v;
1134:
1135: v = (u_int32_t)p[0] << 24;
1136: v |= (u_int32_t)p[1] << 16;
1137: v |= (u_int32_t)p[2] << 8;
1138: v |= (u_int32_t)p[3];
1139:
1140: return (v);
1141: }
1142:
1.93 djm 1143: u_int32_t
1144: get_u32_le(const void *vp)
1145: {
1146: const u_char *p = (const u_char *)vp;
1147: u_int32_t v;
1148:
1149: v = (u_int32_t)p[0];
1150: v |= (u_int32_t)p[1] << 8;
1151: v |= (u_int32_t)p[2] << 16;
1152: v |= (u_int32_t)p[3] << 24;
1153:
1154: return (v);
1155: }
1156:
1.52 djm 1157: u_int16_t
1158: get_u16(const void *vp)
1159: {
1160: const u_char *p = (const u_char *)vp;
1161: u_int16_t v;
1162:
1163: v = (u_int16_t)p[0] << 8;
1164: v |= (u_int16_t)p[1];
1165:
1166: return (v);
1167: }
1168:
1169: void
1170: put_u64(void *vp, u_int64_t v)
1171: {
1172: u_char *p = (u_char *)vp;
1173:
1174: p[0] = (u_char)(v >> 56) & 0xff;
1175: p[1] = (u_char)(v >> 48) & 0xff;
1176: p[2] = (u_char)(v >> 40) & 0xff;
1177: p[3] = (u_char)(v >> 32) & 0xff;
1178: p[4] = (u_char)(v >> 24) & 0xff;
1179: p[5] = (u_char)(v >> 16) & 0xff;
1180: p[6] = (u_char)(v >> 8) & 0xff;
1181: p[7] = (u_char)v & 0xff;
1182: }
1183:
1184: void
1185: put_u32(void *vp, u_int32_t v)
1186: {
1187: u_char *p = (u_char *)vp;
1188:
1189: p[0] = (u_char)(v >> 24) & 0xff;
1190: p[1] = (u_char)(v >> 16) & 0xff;
1191: p[2] = (u_char)(v >> 8) & 0xff;
1192: p[3] = (u_char)v & 0xff;
1193: }
1194:
1.93 djm 1195: void
1196: put_u32_le(void *vp, u_int32_t v)
1197: {
1198: u_char *p = (u_char *)vp;
1199:
1200: p[0] = (u_char)v & 0xff;
1201: p[1] = (u_char)(v >> 8) & 0xff;
1202: p[2] = (u_char)(v >> 16) & 0xff;
1203: p[3] = (u_char)(v >> 24) & 0xff;
1204: }
1.52 djm 1205:
1206: void
1207: put_u16(void *vp, u_int16_t v)
1208: {
1209: u_char *p = (u_char *)vp;
1210:
1211: p[0] = (u_char)(v >> 8) & 0xff;
1212: p[1] = (u_char)v & 0xff;
1213: }
1.68 dtucker 1214:
1215: void
1216: ms_subtract_diff(struct timeval *start, int *ms)
1217: {
1218: struct timeval diff, finish;
1219:
1.119 dtucker 1220: monotime_tv(&finish);
1221: timersub(&finish, start, &diff);
1.68 dtucker 1222: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
1223: }
1224:
1225: void
1226: ms_to_timeval(struct timeval *tv, int ms)
1227: {
1228: if (ms < 0)
1229: ms = 0;
1230: tv->tv_sec = ms / 1000;
1231: tv->tv_usec = (ms % 1000) * 1000;
1.90 dtucker 1232: }
1233:
1.119 dtucker 1234: void
1235: monotime_ts(struct timespec *ts)
1236: {
1237: if (clock_gettime(CLOCK_MONOTONIC, ts) != 0)
1238: fatal("clock_gettime: %s", strerror(errno));
1239: }
1240:
1241: void
1242: monotime_tv(struct timeval *tv)
1243: {
1244: struct timespec ts;
1245:
1246: monotime_ts(&ts);
1247: tv->tv_sec = ts.tv_sec;
1248: tv->tv_usec = ts.tv_nsec / 1000;
1249: }
1250:
1.90 dtucker 1251: time_t
1252: monotime(void)
1253: {
1254: struct timespec ts;
1255:
1.119 dtucker 1256: monotime_ts(&ts);
1.90 dtucker 1257: return (ts.tv_sec);
1.102 dtucker 1258: }
1259:
1260: double
1261: monotime_double(void)
1262: {
1263: struct timespec ts;
1264:
1.119 dtucker 1265: monotime_ts(&ts);
1266: return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
1.81 djm 1267: }
1268:
1269: void
1270: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
1271: {
1272: bw->buflen = buflen;
1273: bw->rate = kbps;
1.135 ! dtucker 1274: bw->thresh = buflen;
1.81 djm 1275: bw->lamt = 0;
1276: timerclear(&bw->bwstart);
1277: timerclear(&bw->bwend);
1.135 ! dtucker 1278: }
1.81 djm 1279:
1280: /* Callback from read/write loop to insert bandwidth-limiting delays */
1281: void
1282: bandwidth_limit(struct bwlimit *bw, size_t read_len)
1283: {
1284: u_int64_t waitlen;
1285: struct timespec ts, rm;
1286:
1.135 ! dtucker 1287: bw->lamt += read_len;
1.81 djm 1288: if (!timerisset(&bw->bwstart)) {
1.119 dtucker 1289: monotime_tv(&bw->bwstart);
1.81 djm 1290: return;
1291: }
1292: if (bw->lamt < bw->thresh)
1293: return;
1294:
1.119 dtucker 1295: monotime_tv(&bw->bwend);
1.81 djm 1296: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
1297: if (!timerisset(&bw->bwend))
1298: return;
1299:
1300: bw->lamt *= 8;
1301: waitlen = (double)1000000L * bw->lamt / bw->rate;
1302:
1303: bw->bwstart.tv_sec = waitlen / 1000000L;
1304: bw->bwstart.tv_usec = waitlen % 1000000L;
1305:
1306: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
1307: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
1308:
1309: /* Adjust the wait time */
1310: if (bw->bwend.tv_sec) {
1311: bw->thresh /= 2;
1312: if (bw->thresh < bw->buflen / 4)
1313: bw->thresh = bw->buflen / 4;
1314: } else if (bw->bwend.tv_usec < 10000) {
1315: bw->thresh *= 2;
1316: if (bw->thresh > bw->buflen * 8)
1317: bw->thresh = bw->buflen * 8;
1318: }
1319:
1320: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1321: while (nanosleep(&ts, &rm) == -1) {
1322: if (errno != EINTR)
1323: break;
1324: ts = rm;
1325: }
1326: }
1327:
1328: bw->lamt = 0;
1.119 dtucker 1329: monotime_tv(&bw->bwstart);
1.84 djm 1330: }
1331:
1332: /* Make a template filename for mk[sd]temp() */
1333: void
1334: mktemp_proto(char *s, size_t len)
1335: {
1336: const char *tmpdir;
1337: int r;
1338:
1339: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1340: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1341: if (r > 0 && (size_t)r < len)
1342: return;
1343: }
1344: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1345: if (r < 0 || (size_t)r >= len)
1346: fatal("%s: template string too short", __func__);
1.68 dtucker 1347: }
1.83 djm 1348:
1349: static const struct {
1350: const char *name;
1351: int value;
1352: } ipqos[] = {
1.111 djm 1353: { "none", INT_MAX }, /* can't use 0 here; that's CS0 */
1.83 djm 1354: { "af11", IPTOS_DSCP_AF11 },
1355: { "af12", IPTOS_DSCP_AF12 },
1356: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 1357: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 1358: { "af22", IPTOS_DSCP_AF22 },
1359: { "af23", IPTOS_DSCP_AF23 },
1360: { "af31", IPTOS_DSCP_AF31 },
1361: { "af32", IPTOS_DSCP_AF32 },
1362: { "af33", IPTOS_DSCP_AF33 },
1363: { "af41", IPTOS_DSCP_AF41 },
1364: { "af42", IPTOS_DSCP_AF42 },
1365: { "af43", IPTOS_DSCP_AF43 },
1366: { "cs0", IPTOS_DSCP_CS0 },
1367: { "cs1", IPTOS_DSCP_CS1 },
1368: { "cs2", IPTOS_DSCP_CS2 },
1369: { "cs3", IPTOS_DSCP_CS3 },
1370: { "cs4", IPTOS_DSCP_CS4 },
1371: { "cs5", IPTOS_DSCP_CS5 },
1372: { "cs6", IPTOS_DSCP_CS6 },
1373: { "cs7", IPTOS_DSCP_CS7 },
1374: { "ef", IPTOS_DSCP_EF },
1375: { "lowdelay", IPTOS_LOWDELAY },
1376: { "throughput", IPTOS_THROUGHPUT },
1377: { "reliability", IPTOS_RELIABILITY },
1378: { NULL, -1 }
1379: };
1380:
1381: int
1382: parse_ipqos(const char *cp)
1383: {
1384: u_int i;
1385: char *ep;
1386: long val;
1387:
1388: if (cp == NULL)
1389: return -1;
1390: for (i = 0; ipqos[i].name != NULL; i++) {
1391: if (strcasecmp(cp, ipqos[i].name) == 0)
1392: return ipqos[i].value;
1393: }
1394: /* Try parsing as an integer */
1395: val = strtol(cp, &ep, 0);
1396: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1397: return -1;
1398: return val;
1399: }
1400:
1.85 stevesk 1401: const char *
1402: iptos2str(int iptos)
1403: {
1404: int i;
1405: static char iptos_str[sizeof "0xff"];
1406:
1407: for (i = 0; ipqos[i].name != NULL; i++) {
1408: if (ipqos[i].value == iptos)
1409: return ipqos[i].name;
1410: }
1411: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1412: return iptos_str;
1.92 djm 1413: }
1414:
1415: void
1416: lowercase(char *s)
1417: {
1418: for (; *s; s++)
1419: *s = tolower((u_char)*s);
1.94 millert 1420: }
1421:
1422: int
1423: unix_listener(const char *path, int backlog, int unlink_first)
1424: {
1425: struct sockaddr_un sunaddr;
1426: int saved_errno, sock;
1427:
1428: memset(&sunaddr, 0, sizeof(sunaddr));
1429: sunaddr.sun_family = AF_UNIX;
1.121 djm 1430: if (strlcpy(sunaddr.sun_path, path,
1431: sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1432: error("%s: path \"%s\" too long for Unix domain socket",
1433: __func__, path);
1.94 millert 1434: errno = ENAMETOOLONG;
1435: return -1;
1436: }
1437:
1438: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1439: if (sock < 0) {
1440: saved_errno = errno;
1.121 djm 1441: error("%s: socket: %.100s", __func__, strerror(errno));
1.94 millert 1442: errno = saved_errno;
1443: return -1;
1444: }
1445: if (unlink_first == 1) {
1446: if (unlink(path) != 0 && errno != ENOENT)
1447: error("unlink(%s): %.100s", path, strerror(errno));
1448: }
1449: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1450: saved_errno = errno;
1.121 djm 1451: error("%s: cannot bind to path %s: %s",
1452: __func__, path, strerror(errno));
1.122 djm 1453: close(sock);
1.94 millert 1454: errno = saved_errno;
1455: return -1;
1456: }
1457: if (listen(sock, backlog) < 0) {
1458: saved_errno = errno;
1.122 djm 1459: error("%s: cannot listen on path %s: %s",
1460: __func__, path, strerror(errno));
1.94 millert 1461: close(sock);
1462: unlink(path);
1463: errno = saved_errno;
1464: return -1;
1465: }
1466: return sock;
1.85 stevesk 1467: }
1.104 djm 1468:
1469: /*
1470: * Compares two strings that maybe be NULL. Returns non-zero if strings
1471: * are both NULL or are identical, returns zero otherwise.
1472: */
1473: static int
1474: strcmp_maybe_null(const char *a, const char *b)
1475: {
1476: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1477: return 0;
1478: if (a != NULL && strcmp(a, b) != 0)
1479: return 0;
1480: return 1;
1481: }
1482:
1483: /*
1484: * Compare two forwards, returning non-zero if they are identical or
1485: * zero otherwise.
1486: */
1487: int
1488: forward_equals(const struct Forward *a, const struct Forward *b)
1489: {
1490: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1491: return 0;
1492: if (a->listen_port != b->listen_port)
1493: return 0;
1494: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1495: return 0;
1496: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1497: return 0;
1498: if (a->connect_port != b->connect_port)
1499: return 0;
1500: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1501: return 0;
1502: /* allocated_port and handle are not checked */
1.107 dtucker 1503: return 1;
1504: }
1505:
1506: /* returns 1 if process is already daemonized, 0 otherwise */
1507: int
1508: daemonized(void)
1509: {
1510: int fd;
1511:
1512: if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1513: close(fd);
1514: return 0; /* have controlling terminal */
1515: }
1516: if (getppid() != 1)
1517: return 0; /* parent is not init */
1518: if (getsid(0) != getpid())
1519: return 0; /* not session leader */
1520: debug3("already daemonized");
1.106 dtucker 1521: return 1;
1522: }
1.112 djm 1523:
1524:
1525: /*
1526: * Splits 's' into an argument vector. Handles quoted string and basic
1527: * escape characters (\\, \", \'). Caller must free the argument vector
1528: * and its members.
1529: */
1530: int
1531: argv_split(const char *s, int *argcp, char ***argvp)
1532: {
1533: int r = SSH_ERR_INTERNAL_ERROR;
1534: int argc = 0, quote, i, j;
1535: char *arg, **argv = xcalloc(1, sizeof(*argv));
1536:
1537: *argvp = NULL;
1538: *argcp = 0;
1539:
1540: for (i = 0; s[i] != '\0'; i++) {
1541: /* Skip leading whitespace */
1542: if (s[i] == ' ' || s[i] == '\t')
1543: continue;
1544:
1545: /* Start of a token */
1546: quote = 0;
1547: if (s[i] == '\\' &&
1548: (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\'))
1549: i++;
1550: else if (s[i] == '\'' || s[i] == '"')
1551: quote = s[i++];
1552:
1553: argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
1554: arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
1555: argv[argc] = NULL;
1556:
1557: /* Copy the token in, removing escapes */
1558: for (j = 0; s[i] != '\0'; i++) {
1559: if (s[i] == '\\') {
1560: if (s[i + 1] == '\'' ||
1561: s[i + 1] == '\"' ||
1562: s[i + 1] == '\\') {
1563: i++; /* Skip '\' */
1564: arg[j++] = s[i];
1565: } else {
1566: /* Unrecognised escape */
1567: arg[j++] = s[i];
1568: }
1569: } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
1570: break; /* done */
1571: else if (quote != 0 && s[i] == quote)
1572: break; /* done */
1573: else
1574: arg[j++] = s[i];
1575: }
1576: if (s[i] == '\0') {
1577: if (quote != 0) {
1578: /* Ran out of string looking for close quote */
1579: r = SSH_ERR_INVALID_FORMAT;
1580: goto out;
1581: }
1582: break;
1583: }
1584: }
1585: /* Success */
1586: *argcp = argc;
1587: *argvp = argv;
1588: argc = 0;
1589: argv = NULL;
1590: r = 0;
1591: out:
1592: if (argc != 0 && argv != NULL) {
1593: for (i = 0; i < argc; i++)
1594: free(argv[i]);
1595: free(argv);
1596: }
1597: return r;
1598: }
1599:
1600: /*
1601: * Reassemble an argument vector into a string, quoting and escaping as
1602: * necessary. Caller must free returned string.
1603: */
1604: char *
1605: argv_assemble(int argc, char **argv)
1606: {
1607: int i, j, ws, r;
1608: char c, *ret;
1609: struct sshbuf *buf, *arg;
1610:
1611: if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
1612: fatal("%s: sshbuf_new failed", __func__);
1613:
1614: for (i = 0; i < argc; i++) {
1615: ws = 0;
1616: sshbuf_reset(arg);
1617: for (j = 0; argv[i][j] != '\0'; j++) {
1618: r = 0;
1619: c = argv[i][j];
1620: switch (c) {
1621: case ' ':
1622: case '\t':
1623: ws = 1;
1624: r = sshbuf_put_u8(arg, c);
1625: break;
1626: case '\\':
1627: case '\'':
1628: case '"':
1629: if ((r = sshbuf_put_u8(arg, '\\')) != 0)
1630: break;
1631: /* FALLTHROUGH */
1632: default:
1633: r = sshbuf_put_u8(arg, c);
1634: break;
1635: }
1636: if (r != 0)
1637: fatal("%s: sshbuf_put_u8: %s",
1638: __func__, ssh_err(r));
1639: }
1640: if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
1641: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
1642: (r = sshbuf_putb(buf, arg)) != 0 ||
1643: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
1644: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1645: }
1646: if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
1647: fatal("%s: malloc failed", __func__);
1648: memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
1649: ret[sshbuf_len(buf)] = '\0';
1650: sshbuf_free(buf);
1651: sshbuf_free(arg);
1652: return ret;
1653: }
1654:
1655: /* Returns 0 if pid exited cleanly, non-zero otherwise */
1656: int
1.113 djm 1657: exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
1.112 djm 1658: {
1659: int status;
1660:
1661: while (waitpid(pid, &status, 0) == -1) {
1662: if (errno != EINTR) {
1663: error("%s: waitpid: %s", tag, strerror(errno));
1664: return -1;
1665: }
1666: }
1667: if (WIFSIGNALED(status)) {
1668: error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
1669: return -1;
1670: } else if (WEXITSTATUS(status) != 0) {
1.113 djm 1671: do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
1672: "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
1.112 djm 1673: return -1;
1674: }
1675: return 0;
1676: }
1677:
1678: /*
1679: * Check a given path for security. This is defined as all components
1680: * of the path to the file must be owned by either the owner of
1681: * of the file or root and no directories must be group or world writable.
1682: *
1683: * XXX Should any specific check be done for sym links ?
1684: *
1685: * Takes a file name, its stat information (preferably from fstat() to
1686: * avoid races), the uid of the expected owner, their home directory and an
1687: * error buffer plus max size as arguments.
1688: *
1689: * Returns 0 on success and -1 on failure
1690: */
1691: int
1692: safe_path(const char *name, struct stat *stp, const char *pw_dir,
1693: uid_t uid, char *err, size_t errlen)
1694: {
1695: char buf[PATH_MAX], homedir[PATH_MAX];
1696: char *cp;
1697: int comparehome = 0;
1698: struct stat st;
1699:
1700: if (realpath(name, buf) == NULL) {
1701: snprintf(err, errlen, "realpath %s failed: %s", name,
1702: strerror(errno));
1703: return -1;
1704: }
1705: if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
1706: comparehome = 1;
1707:
1708: if (!S_ISREG(stp->st_mode)) {
1709: snprintf(err, errlen, "%s is not a regular file", buf);
1710: return -1;
1711: }
1712: if ((stp->st_uid != 0 && stp->st_uid != uid) ||
1713: (stp->st_mode & 022) != 0) {
1714: snprintf(err, errlen, "bad ownership or modes for file %s",
1715: buf);
1716: return -1;
1717: }
1718:
1719: /* for each component of the canonical path, walking upwards */
1720: for (;;) {
1721: if ((cp = dirname(buf)) == NULL) {
1722: snprintf(err, errlen, "dirname() failed");
1723: return -1;
1724: }
1725: strlcpy(buf, cp, sizeof(buf));
1726:
1727: if (stat(buf, &st) < 0 ||
1728: (st.st_uid != 0 && st.st_uid != uid) ||
1729: (st.st_mode & 022) != 0) {
1730: snprintf(err, errlen,
1731: "bad ownership or modes for directory %s", buf);
1732: return -1;
1733: }
1734:
1735: /* If are past the homedir then we can stop */
1736: if (comparehome && strcmp(homedir, buf) == 0)
1737: break;
1738:
1739: /*
1740: * dirname should always complete with a "/" path,
1741: * but we can be paranoid and check for "." too
1742: */
1743: if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
1744: break;
1745: }
1746: return 0;
1747: }
1748:
1749: /*
1750: * Version of safe_path() that accepts an open file descriptor to
1751: * avoid races.
1752: *
1753: * Returns 0 on success and -1 on failure
1754: */
1755: int
1756: safe_path_fd(int fd, const char *file, struct passwd *pw,
1757: char *err, size_t errlen)
1758: {
1759: struct stat st;
1760:
1761: /* check the open file to avoid races */
1762: if (fstat(fd, &st) < 0) {
1763: snprintf(err, errlen, "cannot stat file %s: %s",
1764: file, strerror(errno));
1765: return -1;
1766: }
1767: return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
1768: }
1769:
1770: /*
1771: * Sets the value of the given variable in the environment. If the variable
1772: * already exists, its value is overridden.
1773: */
1774: void
1775: child_set_env(char ***envp, u_int *envsizep, const char *name,
1776: const char *value)
1777: {
1778: char **env;
1779: u_int envsize;
1780: u_int i, namelen;
1781:
1782: if (strchr(name, '=') != NULL) {
1783: error("Invalid environment variable \"%.100s\"", name);
1784: return;
1785: }
1786:
1787: /*
1788: * Find the slot where the value should be stored. If the variable
1789: * already exists, we reuse the slot; otherwise we append a new slot
1790: * at the end of the array, expanding if necessary.
1791: */
1792: env = *envp;
1793: namelen = strlen(name);
1794: for (i = 0; env[i]; i++)
1795: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
1796: break;
1797: if (env[i]) {
1798: /* Reuse the slot. */
1799: free(env[i]);
1800: } else {
1801: /* New variable. Expand if necessary. */
1802: envsize = *envsizep;
1803: if (i >= envsize - 1) {
1804: if (envsize >= 1000)
1805: fatal("child_set_env: too many env vars");
1806: envsize += 50;
1807: env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
1808: *envsizep = envsize;
1809: }
1810: /* Need to set the NULL pointer at end of array beyond the new slot. */
1811: env[i + 1] = NULL;
1812: }
1813:
1814: /* Allocate space and format the variable in the appropriate slot. */
1.125 djm 1815: /* XXX xasprintf */
1.112 djm 1816: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
1817: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
1818: }
1819:
1.114 millert 1820: /*
1821: * Check and optionally lowercase a domain name, also removes trailing '.'
1822: * Returns 1 on success and 0 on failure, storing an error message in errstr.
1823: */
1824: int
1825: valid_domain(char *name, int makelower, const char **errstr)
1826: {
1827: size_t i, l = strlen(name);
1828: u_char c, last = '\0';
1829: static char errbuf[256];
1830:
1831: if (l == 0) {
1832: strlcpy(errbuf, "empty domain name", sizeof(errbuf));
1833: goto bad;
1834: }
1835: if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
1836: snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
1837: "starts with invalid character", name);
1838: goto bad;
1839: }
1840: for (i = 0; i < l; i++) {
1841: c = tolower((u_char)name[i]);
1842: if (makelower)
1843: name[i] = (char)c;
1844: if (last == '.' && c == '.') {
1845: snprintf(errbuf, sizeof(errbuf), "domain name "
1846: "\"%.100s\" contains consecutive separators", name);
1847: goto bad;
1848: }
1849: if (c != '.' && c != '-' && !isalnum(c) &&
1850: c != '_') /* technically invalid, but common */ {
1851: snprintf(errbuf, sizeof(errbuf), "domain name "
1852: "\"%.100s\" contains invalid characters", name);
1853: goto bad;
1854: }
1855: last = c;
1856: }
1857: if (name[l - 1] == '.')
1858: name[l - 1] = '\0';
1859: if (errstr != NULL)
1860: *errstr = NULL;
1861: return 1;
1862: bad:
1863: if (errstr != NULL)
1864: *errstr = errbuf;
1865: return 0;
1.132 djm 1866: }
1867:
1868: /*
1869: * Verify that a environment variable name (not including initial '$') is
1870: * valid; consisting of one or more alphanumeric or underscore characters only.
1871: * Returns 1 on valid, 0 otherwise.
1872: */
1873: int
1874: valid_env_name(const char *name)
1875: {
1876: const char *cp;
1877:
1878: if (name[0] == '\0')
1879: return 0;
1880: for (cp = name; *cp != '\0'; cp++) {
1881: if (!isalnum((u_char)*cp) && *cp != '_')
1882: return 0;
1883: }
1884: return 1;
1.120 dtucker 1885: }
1886:
1887: const char *
1888: atoi_err(const char *nptr, int *val)
1889: {
1890: const char *errstr = NULL;
1891: long long num;
1892:
1893: if (nptr == NULL || *nptr == '\0')
1894: return "missing";
1895: num = strtonum(nptr, 0, INT_MAX, &errstr);
1896: if (errstr == NULL)
1897: *val = (int)num;
1898: return errstr;
1.127 djm 1899: }
1900:
1901: int
1902: parse_absolute_time(const char *s, uint64_t *tp)
1903: {
1904: struct tm tm;
1905: time_t tt;
1906: char buf[32], *fmt;
1907:
1908: *tp = 0;
1909:
1910: /*
1911: * POSIX strptime says "The application shall ensure that there
1912: * is white-space or other non-alphanumeric characters between
1913: * any two conversion specifications" so arrange things this way.
1914: */
1915: switch (strlen(s)) {
1916: case 8: /* YYYYMMDD */
1917: fmt = "%Y-%m-%d";
1918: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
1919: break;
1920: case 12: /* YYYYMMDDHHMM */
1921: fmt = "%Y-%m-%dT%H:%M";
1922: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s",
1923: s, s + 4, s + 6, s + 8, s + 10);
1924: break;
1925: case 14: /* YYYYMMDDHHMMSS */
1926: fmt = "%Y-%m-%dT%H:%M:%S";
1927: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
1928: s, s + 4, s + 6, s + 8, s + 10, s + 12);
1929: break;
1930: default:
1931: return SSH_ERR_INVALID_FORMAT;
1932: }
1933:
1934: memset(&tm, 0, sizeof(tm));
1935: if (strptime(buf, fmt, &tm) == NULL)
1936: return SSH_ERR_INVALID_FORMAT;
1937: if ((tt = mktime(&tm)) < 0)
1938: return SSH_ERR_INVALID_FORMAT;
1939: /* success */
1940: *tp = (uint64_t)tt;
1941: return 0;
1942: }
1943:
1944: void
1945: format_absolute_time(uint64_t t, char *buf, size_t len)
1946: {
1947: time_t tt = t > INT_MAX ? INT_MAX : t; /* XXX revisit in 2038 :P */
1948: struct tm tm;
1949:
1950: localtime_r(&tt, &tm);
1951: strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
1.134 djm 1952: }
1953:
1954: /* check if path is absolute */
1955: int
1956: path_absolute(const char *path)
1957: {
1958: return (*path == '/') ? 1 : 0;
1.114 millert 1959: }
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