Annotation of src/usr.bin/ssh/misc.c, Revision 1.172
1.172 ! djm 1: /* $OpenBSD: misc.c,v 1.171 2021/11/13 21:14:13 deraadt Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.148 djm 4: * Copyright (c) 2005-2020 Damien Miller. All rights reserved.
5: * Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
1.1 markus 6: *
1.148 djm 7: * Permission to use, copy, modify, and distribute this software for any
8: * purpose with or without fee is hereby granted, provided that the above
9: * copyright notice and this permission notice appear in all copies.
1.1 markus 10: *
1.148 djm 11: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 markus 18: */
19:
1.148 djm 20:
1.64 deraadt 21: #include <sys/types.h>
1.45 stevesk 22: #include <sys/ioctl.h>
1.53 stevesk 23: #include <sys/socket.h>
1.112 djm 24: #include <sys/stat.h>
1.101 dtucker 25: #include <sys/time.h>
1.112 djm 26: #include <sys/wait.h>
1.94 millert 27: #include <sys/un.h>
1.38 stevesk 28:
29: #include <net/if.h>
1.53 stevesk 30: #include <netinet/in.h>
1.83 djm 31: #include <netinet/ip.h>
1.44 stevesk 32: #include <netinet/tcp.h>
1.133 naddy 33: #include <arpa/inet.h>
1.43 stevesk 34:
1.92 djm 35: #include <ctype.h>
1.58 stevesk 36: #include <errno.h>
1.55 stevesk 37: #include <fcntl.h>
1.66 dtucker 38: #include <netdb.h>
1.43 stevesk 39: #include <paths.h>
1.54 stevesk 40: #include <pwd.h>
1.112 djm 41: #include <libgen.h>
1.96 deraadt 42: #include <limits.h>
1.136 djm 43: #include <poll.h>
1.112 djm 44: #include <signal.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"
1.112 djm 55: #include "sshbuf.h"
56: #include "ssherr.h"
1.1 markus 57:
1.12 markus 58: /* remove newline at end of string */
1.1 markus 59: char *
60: chop(char *s)
61: {
62: char *t = s;
63: while (*t) {
1.13 deraadt 64: if (*t == '\n' || *t == '\r') {
1.1 markus 65: *t = '\0';
66: return s;
67: }
68: t++;
69: }
70: return s;
71:
72: }
73:
1.166 djm 74: /* remove whitespace from end of string */
75: void
76: rtrim(char *s)
77: {
78: size_t i;
79:
80: if ((i = strlen(s)) == 0)
81: return;
82: for (i--; i > 0; i--) {
83: if (isspace((int)s[i]))
84: s[i] = '\0';
85: }
86: }
87:
1.12 markus 88: /* set/unset filedescriptor to non-blocking */
1.24 djm 89: int
1.1 markus 90: set_nonblock(int fd)
91: {
92: int val;
1.8 markus 93:
1.103 krw 94: val = fcntl(fd, F_GETFL);
1.139 deraadt 95: if (val == -1) {
1.103 krw 96: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 97: return (-1);
1.1 markus 98: }
99: if (val & O_NONBLOCK) {
1.24 djm 100: debug3("fd %d is O_NONBLOCK", fd);
101: return (0);
1.1 markus 102: }
1.21 markus 103: debug2("fd %d setting O_NONBLOCK", fd);
1.1 markus 104: val |= O_NONBLOCK;
1.24 djm 105: if (fcntl(fd, F_SETFL, val) == -1) {
106: debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
107: strerror(errno));
108: return (-1);
109: }
110: return (0);
1.8 markus 111: }
112:
1.24 djm 113: int
1.8 markus 114: unset_nonblock(int fd)
115: {
116: int val;
117:
1.103 krw 118: val = fcntl(fd, F_GETFL);
1.139 deraadt 119: if (val == -1) {
1.103 krw 120: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 121: return (-1);
1.8 markus 122: }
123: if (!(val & O_NONBLOCK)) {
1.24 djm 124: debug3("fd %d is not O_NONBLOCK", fd);
125: return (0);
1.8 markus 126: }
1.10 markus 127: debug("fd %d clearing O_NONBLOCK", fd);
1.8 markus 128: val &= ~O_NONBLOCK;
1.24 djm 129: if (fcntl(fd, F_SETFL, val) == -1) {
130: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
1.18 markus 131: fd, strerror(errno));
1.24 djm 132: return (-1);
133: }
134: return (0);
1.66 dtucker 135: }
136:
137: const char *
138: ssh_gai_strerror(int gaierr)
139: {
1.91 djm 140: if (gaierr == EAI_SYSTEM && errno != 0)
1.67 dtucker 141: return strerror(errno);
142: return gai_strerror(gaierr);
1.15 stevesk 143: }
144:
145: /* disable nagle on socket */
146: void
147: set_nodelay(int fd)
148: {
1.17 stevesk 149: int opt;
150: socklen_t optlen;
1.15 stevesk 151:
1.16 stevesk 152: optlen = sizeof opt;
153: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
1.23 markus 154: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
1.16 stevesk 155: return;
156: }
157: if (opt == 1) {
158: debug2("fd %d is TCP_NODELAY", fd);
159: return;
160: }
161: opt = 1;
1.20 markus 162: debug2("fd %d setting TCP_NODELAY", fd);
1.16 stevesk 163: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
1.15 stevesk 164: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.117 djm 165: }
166:
167: /* Allow local port reuse in TIME_WAIT */
168: int
169: set_reuseaddr(int fd)
170: {
171: int on = 1;
172:
173: if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
174: error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
175: return -1;
176: }
177: return 0;
178: }
179:
1.118 djm 180: /* Get/set routing domain */
181: char *
182: get_rdomain(int fd)
183: {
184: int rtable;
185: char *ret;
186: socklen_t len = sizeof(rtable);
187:
188: if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) {
189: error("Failed to get routing domain for fd %d: %s",
190: fd, strerror(errno));
191: return NULL;
192: }
193: xasprintf(&ret, "%d", rtable);
194: return ret;
195: }
196:
1.117 djm 197: int
198: set_rdomain(int fd, const char *name)
199: {
200: int rtable;
201: const char *errstr;
202:
203: if (name == NULL)
204: return 0; /* default table */
205:
206: rtable = (int)strtonum(name, 0, 255, &errstr);
207: if (errstr != NULL) {
208: /* Shouldn't happen */
209: error("Invalid routing domain \"%s\": %s", name, errstr);
210: return -1;
211: }
212: if (setsockopt(fd, SOL_SOCKET, SO_RTABLE,
213: &rtable, sizeof(rtable)) == -1) {
214: error("Failed to set routing domain %d on fd %d: %s",
215: rtable, fd, strerror(errno));
216: return -1;
217: }
1.136 djm 218: return 0;
1.156 djm 219: }
220:
221: int
222: get_sock_af(int fd)
223: {
224: struct sockaddr_storage to;
225: socklen_t tolen = sizeof(to);
226:
227: memset(&to, 0, sizeof(to));
228: if (getsockname(fd, (struct sockaddr *)&to, &tolen) == -1)
229: return -1;
230: return to.ss_family;
231: }
232:
233: void
234: set_sock_tos(int fd, int tos)
235: {
236: int af;
237:
238: switch ((af = get_sock_af(fd))) {
239: case -1:
240: /* assume not a socket */
241: break;
242: case AF_INET:
243: debug3_f("set socket %d IP_TOS 0x%02x", fd, tos);
244: if (setsockopt(fd, IPPROTO_IP, IP_TOS,
245: &tos, sizeof(tos)) == -1) {
246: error("setsockopt socket %d IP_TOS %d: %s:",
247: fd, tos, strerror(errno));
248: }
249: break;
250: case AF_INET6:
251: debug3_f("set socket %d IPV6_TCLASS 0x%02x", fd, tos);
252: if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS,
253: &tos, sizeof(tos)) == -1) {
254: error("setsockopt socket %d IPV6_TCLASS %d: %.100s:",
255: fd, tos, strerror(errno));
256: }
257: break;
258: default:
259: debug2_f("unsupported socket family %d", af);
260: break;
261: }
1.136 djm 262: }
263:
264: /*
1.143 dtucker 265: * Wait up to *timeoutp milliseconds for events on fd. Updates
1.136 djm 266: * *timeoutp with time remaining.
267: * Returns 0 if fd ready or -1 on timeout or error (see errno).
268: */
1.143 dtucker 269: static int
270: waitfd(int fd, int *timeoutp, short events)
1.136 djm 271: {
272: struct pollfd pfd;
273: struct timeval t_start;
274: int oerrno, r;
275:
276: pfd.fd = fd;
1.143 dtucker 277: pfd.events = events;
1.136 djm 278: for (; *timeoutp >= 0;) {
1.159 dtucker 279: monotime_tv(&t_start);
1.136 djm 280: r = poll(&pfd, 1, *timeoutp);
281: oerrno = errno;
282: ms_subtract_diff(&t_start, timeoutp);
283: errno = oerrno;
284: if (r > 0)
285: return 0;
1.153 djm 286: else if (r == -1 && errno != EAGAIN && errno != EINTR)
1.136 djm 287: return -1;
288: else if (r == 0)
289: break;
290: }
291: /* timeout */
292: errno = ETIMEDOUT;
293: return -1;
294: }
295:
296: /*
1.143 dtucker 297: * Wait up to *timeoutp milliseconds for fd to be readable. Updates
298: * *timeoutp with time remaining.
299: * Returns 0 if fd ready or -1 on timeout or error (see errno).
300: */
301: int
302: waitrfd(int fd, int *timeoutp) {
303: return waitfd(fd, timeoutp, POLLIN);
304: }
305:
306: /*
1.136 djm 307: * Attempt a non-blocking connect(2) to the specified address, waiting up to
308: * *timeoutp milliseconds for the connection to complete. If the timeout is
309: * <=0, then wait indefinitely.
310: *
311: * Returns 0 on success or -1 on failure.
312: */
313: int
314: timeout_connect(int sockfd, const struct sockaddr *serv_addr,
315: socklen_t addrlen, int *timeoutp)
316: {
317: int optval = 0;
318: socklen_t optlen = sizeof(optval);
319:
320: /* No timeout: just do a blocking connect() */
321: if (timeoutp == NULL || *timeoutp <= 0)
322: return connect(sockfd, serv_addr, addrlen);
323:
324: set_nonblock(sockfd);
1.153 djm 325: for (;;) {
326: if (connect(sockfd, serv_addr, addrlen) == 0) {
327: /* Succeeded already? */
328: unset_nonblock(sockfd);
329: return 0;
330: } else if (errno == EINTR)
331: continue;
332: else if (errno != EINPROGRESS)
333: return -1;
334: break;
335: }
1.136 djm 336:
1.143 dtucker 337: if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT) == -1)
1.136 djm 338: return -1;
339:
340: /* Completed or failed */
341: if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) {
342: debug("getsockopt: %s", strerror(errno));
343: return -1;
344: }
345: if (optval != 0) {
346: errno = optval;
347: return -1;
348: }
349: unset_nonblock(sockfd);
1.117 djm 350: return 0;
1.72 reyk 351: }
352:
1.1 markus 353: /* Characters considered whitespace in strsep calls. */
354: #define WHITESPACE " \t\r\n"
1.46 dtucker 355: #define QUOTE "\""
1.1 markus 356:
1.12 markus 357: /* return next token in configuration line */
1.129 djm 358: static char *
359: strdelim_internal(char **s, int split_equals)
1.1 markus 360: {
1.126 djm 361: char *old;
1.1 markus 362: int wspace = 0;
363:
364: if (*s == NULL)
365: return NULL;
366:
367: old = *s;
368:
1.129 djm 369: *s = strpbrk(*s,
370: split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE);
1.1 markus 371: if (*s == NULL)
372: return (old);
373:
1.46 dtucker 374: if (*s[0] == '\"') {
375: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
376: /* Find matching quote */
1.126 djm 377: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
378: return (NULL); /* no matching quote */
379: } else {
380: *s[0] = '\0';
381: *s += strspn(*s + 1, WHITESPACE) + 1;
382: return (old);
1.46 dtucker 383: }
384: }
385:
1.1 markus 386: /* Allow only one '=' to be skipped */
1.129 djm 387: if (split_equals && *s[0] == '=')
1.1 markus 388: wspace = 1;
389: *s[0] = '\0';
390:
1.46 dtucker 391: /* Skip any extra whitespace after first token */
1.1 markus 392: *s += strspn(*s + 1, WHITESPACE) + 1;
1.129 djm 393: if (split_equals && *s[0] == '=' && !wspace)
1.1 markus 394: *s += strspn(*s + 1, WHITESPACE) + 1;
395:
396: return (old);
1.129 djm 397: }
398:
399: /*
400: * Return next token in configuration line; splts on whitespace or a
401: * single '=' character.
402: */
403: char *
404: strdelim(char **s)
405: {
406: return strdelim_internal(s, 1);
407: }
408:
409: /*
410: * Return next token in configuration line; splts on whitespace only.
411: */
412: char *
413: strdelimw(char **s)
414: {
415: return strdelim_internal(s, 0);
1.2 markus 416: }
417:
418: struct passwd *
419: pwcopy(struct passwd *pw)
420: {
1.49 djm 421: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 422:
1.2 markus 423: copy->pw_name = xstrdup(pw->pw_name);
424: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 425: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 426: copy->pw_uid = pw->pw_uid;
427: copy->pw_gid = pw->pw_gid;
1.11 markus 428: copy->pw_expire = pw->pw_expire;
429: copy->pw_change = pw->pw_change;
1.2 markus 430: copy->pw_class = xstrdup(pw->pw_class);
431: copy->pw_dir = xstrdup(pw->pw_dir);
432: copy->pw_shell = xstrdup(pw->pw_shell);
433: return copy;
1.5 stevesk 434: }
435:
1.12 markus 436: /*
437: * Convert ASCII string to TCP/IP port number.
1.70 djm 438: * Port must be >=0 and <=65535.
439: * Return -1 if invalid.
1.12 markus 440: */
441: int
442: a2port(const char *s)
1.5 stevesk 443: {
1.133 naddy 444: struct servent *se;
1.70 djm 445: long long port;
446: const char *errstr;
1.5 stevesk 447:
1.70 djm 448: port = strtonum(s, 0, 65535, &errstr);
1.133 naddy 449: if (errstr == NULL)
450: return (int)port;
451: if ((se = getservbyname(s, "tcp")) != NULL)
452: return ntohs(se->s_port);
453: return -1;
1.9 stevesk 454: }
455:
1.36 reyk 456: int
457: a2tun(const char *s, int *remote)
458: {
459: const char *errstr = NULL;
460: char *sp, *ep;
461: int tun;
462:
463: if (remote != NULL) {
1.37 reyk 464: *remote = SSH_TUNID_ANY;
1.36 reyk 465: sp = xstrdup(s);
466: if ((ep = strchr(sp, ':')) == NULL) {
1.89 djm 467: free(sp);
1.36 reyk 468: return (a2tun(s, NULL));
469: }
470: ep[0] = '\0'; ep++;
471: *remote = a2tun(ep, NULL);
472: tun = a2tun(sp, NULL);
1.89 djm 473: free(sp);
1.37 reyk 474: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 475: }
476:
477: if (strcasecmp(s, "any") == 0)
1.37 reyk 478: return (SSH_TUNID_ANY);
1.36 reyk 479:
1.37 reyk 480: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
481: if (errstr != NULL)
482: return (SSH_TUNID_ERR);
1.36 reyk 483:
484: return (tun);
485: }
486:
1.9 stevesk 487: #define SECONDS 1
488: #define MINUTES (SECONDS * 60)
489: #define HOURS (MINUTES * 60)
490: #define DAYS (HOURS * 24)
491: #define WEEKS (DAYS * 7)
492:
1.12 markus 493: /*
494: * Convert a time string into seconds; format is
495: * a sequence of:
496: * time[qualifier]
497: *
498: * Valid time qualifiers are:
499: * <none> seconds
500: * s|S seconds
501: * m|M minutes
502: * h|H hours
503: * d|D days
504: * w|W weeks
505: *
506: * Examples:
507: * 90m 90 minutes
508: * 1h30m 90 minutes
509: * 2d 2 days
510: * 1w 1 week
511: *
512: * Return -1 if time string is invalid.
513: */
1.158 dtucker 514: int
1.12 markus 515: convtime(const char *s)
1.9 stevesk 516: {
1.149 dtucker 517: long total, secs, multiplier;
1.9 stevesk 518: const char *p;
519: char *endp;
520:
521: errno = 0;
522: total = 0;
523: p = s;
524:
525: if (p == NULL || *p == '\0')
526: return -1;
527:
528: while (*p) {
529: secs = strtol(p, &endp, 10);
530: if (p == endp ||
1.158 dtucker 531: (errno == ERANGE && (secs == INT_MIN || secs == INT_MAX)) ||
1.9 stevesk 532: secs < 0)
533: return -1;
534:
1.149 dtucker 535: multiplier = 1;
1.9 stevesk 536: switch (*endp++) {
537: case '\0':
538: endp--;
1.48 deraadt 539: break;
1.9 stevesk 540: case 's':
541: case 'S':
542: break;
543: case 'm':
544: case 'M':
1.108 dtucker 545: multiplier = MINUTES;
1.9 stevesk 546: break;
547: case 'h':
548: case 'H':
1.108 dtucker 549: multiplier = HOURS;
1.9 stevesk 550: break;
551: case 'd':
552: case 'D':
1.108 dtucker 553: multiplier = DAYS;
1.9 stevesk 554: break;
555: case 'w':
556: case 'W':
1.108 dtucker 557: multiplier = WEEKS;
1.9 stevesk 558: break;
559: default:
560: return -1;
561: }
1.160 dtucker 562: if (secs > INT_MAX / multiplier)
1.108 dtucker 563: return -1;
564: secs *= multiplier;
1.160 dtucker 565: if (total > INT_MAX - secs)
1.108 dtucker 566: return -1;
1.9 stevesk 567: total += secs;
568: if (total < 0)
569: return -1;
570: p = endp;
571: }
572:
573: return total;
1.148 djm 574: }
575:
576: #define TF_BUFS 8
577: #define TF_LEN 9
578:
579: const char *
580: fmt_timeframe(time_t t)
581: {
582: char *buf;
583: static char tfbuf[TF_BUFS][TF_LEN]; /* ring buffer */
584: static int idx = 0;
585: unsigned int sec, min, hrs, day;
586: unsigned long long week;
587:
588: buf = tfbuf[idx++];
589: if (idx == TF_BUFS)
590: idx = 0;
591:
592: week = t;
593:
594: sec = week % 60;
595: week /= 60;
596: min = week % 60;
597: week /= 60;
598: hrs = week % 24;
599: week /= 24;
600: day = week % 7;
601: week /= 7;
602:
603: if (week > 0)
604: snprintf(buf, TF_LEN, "%02lluw%01ud%02uh", week, day, hrs);
605: else if (day > 0)
606: snprintf(buf, TF_LEN, "%01ud%02uh%02um", day, hrs, min);
607: else
608: snprintf(buf, TF_LEN, "%02u:%02u:%02u", hrs, min, sec);
609:
610: return (buf);
1.56 dtucker 611: }
612:
613: /*
614: * Returns a standardized host+port identifier string.
615: * Caller must free returned string.
616: */
617: char *
618: put_host_port(const char *host, u_short port)
619: {
620: char *hoststr;
621:
622: if (port == 0 || port == SSH_DEFAULT_PORT)
623: return(xstrdup(host));
1.138 deraadt 624: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1)
1.56 dtucker 625: fatal("put_host_port: asprintf: %s", strerror(errno));
626: debug3("put_host_port: %s", hoststr);
627: return hoststr;
1.28 djm 628: }
629:
630: /*
631: * Search for next delimiter between hostnames/addresses and ports.
632: * Argument may be modified (for termination).
633: * Returns *cp if parsing succeeds.
1.114 millert 634: * *cp is set to the start of the next field, if one was found.
635: * The delimiter char, if present, is stored in delim.
1.28 djm 636: * If this is the last field, *cp is set to NULL.
637: */
1.137 dtucker 638: char *
1.114 millert 639: hpdelim2(char **cp, char *delim)
1.28 djm 640: {
641: char *s, *old;
642:
643: if (cp == NULL || *cp == NULL)
644: return NULL;
645:
646: old = s = *cp;
647: if (*s == '[') {
648: if ((s = strchr(s, ']')) == NULL)
649: return NULL;
650: else
651: s++;
652: } else if ((s = strpbrk(s, ":/")) == NULL)
653: s = *cp + strlen(*cp); /* skip to end (see first case below) */
654:
655: switch (*s) {
656: case '\0':
657: *cp = NULL; /* no more fields*/
658: break;
1.29 deraadt 659:
1.28 djm 660: case ':':
661: case '/':
1.114 millert 662: if (delim != NULL)
663: *delim = *s;
1.28 djm 664: *s = '\0'; /* terminate */
665: *cp = s + 1;
666: break;
1.29 deraadt 667:
1.28 djm 668: default:
669: return NULL;
670: }
671:
672: return old;
1.6 mouring 673: }
674:
675: char *
1.114 millert 676: hpdelim(char **cp)
677: {
678: return hpdelim2(cp, NULL);
679: }
680:
681: char *
1.6 mouring 682: cleanhostname(char *host)
683: {
684: if (*host == '[' && host[strlen(host) - 1] == ']') {
685: host[strlen(host) - 1] = '\0';
686: return (host + 1);
687: } else
688: return host;
689: }
690:
691: char *
692: colon(char *cp)
693: {
694: int flag = 0;
695:
696: if (*cp == ':') /* Leading colon is part of file name. */
1.76 djm 697: return NULL;
1.6 mouring 698: if (*cp == '[')
699: flag = 1;
700:
701: for (; *cp; ++cp) {
702: if (*cp == '@' && *(cp+1) == '[')
703: flag = 1;
704: if (*cp == ']' && *(cp+1) == ':' && flag)
705: return (cp+1);
706: if (*cp == ':' && !flag)
707: return (cp);
708: if (*cp == '/')
1.76 djm 709: return NULL;
1.6 mouring 710: }
1.76 djm 711: return NULL;
1.105 djm 712: }
713:
714: /*
1.114 millert 715: * Parse a [user@]host:[path] string.
716: * Caller must free returned user, host and path.
717: * Any of the pointer return arguments may be NULL (useful for syntax checking).
718: * If user was not specified then *userp will be set to NULL.
719: * If host was not specified then *hostp will be set to NULL.
720: * If path was not specified then *pathp will be set to ".".
721: * Returns 0 on success, -1 on failure.
722: */
723: int
724: parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
725: {
726: char *user = NULL, *host = NULL, *path = NULL;
727: char *sdup, *tmp;
728: int ret = -1;
729:
730: if (userp != NULL)
731: *userp = NULL;
732: if (hostp != NULL)
733: *hostp = NULL;
734: if (pathp != NULL)
735: *pathp = NULL;
736:
1.116 millert 737: sdup = xstrdup(s);
1.114 millert 738:
739: /* Check for remote syntax: [user@]host:[path] */
740: if ((tmp = colon(sdup)) == NULL)
741: goto out;
742:
743: /* Extract optional path */
744: *tmp++ = '\0';
745: if (*tmp == '\0')
746: tmp = ".";
747: path = xstrdup(tmp);
748:
749: /* Extract optional user and mandatory host */
750: tmp = strrchr(sdup, '@');
751: if (tmp != NULL) {
752: *tmp++ = '\0';
753: host = xstrdup(cleanhostname(tmp));
754: if (*sdup != '\0')
755: user = xstrdup(sdup);
756: } else {
757: host = xstrdup(cleanhostname(sdup));
758: user = NULL;
759: }
760:
761: /* Success */
762: if (userp != NULL) {
763: *userp = user;
764: user = NULL;
765: }
766: if (hostp != NULL) {
767: *hostp = host;
768: host = NULL;
1.116 millert 769: }
1.114 millert 770: if (pathp != NULL) {
771: *pathp = path;
772: path = NULL;
1.116 millert 773: }
1.114 millert 774: ret = 0;
775: out:
776: free(sdup);
777: free(user);
778: free(host);
779: free(path);
780: return ret;
781: }
782:
783: /*
1.105 djm 784: * Parse a [user@]host[:port] string.
785: * Caller must free returned user and host.
786: * Any of the pointer return arguments may be NULL (useful for syntax checking).
787: * If user was not specified then *userp will be set to NULL.
788: * If port was not specified then *portp will be -1.
789: * Returns 0 on success, -1 on failure.
790: */
791: int
792: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
793: {
794: char *sdup, *cp, *tmp;
795: char *user = NULL, *host = NULL;
796: int port = -1, ret = -1;
797:
798: if (userp != NULL)
799: *userp = NULL;
800: if (hostp != NULL)
801: *hostp = NULL;
802: if (portp != NULL)
803: *portp = -1;
804:
805: if ((sdup = tmp = strdup(s)) == NULL)
806: return -1;
807: /* Extract optional username */
1.114 millert 808: if ((cp = strrchr(tmp, '@')) != NULL) {
1.105 djm 809: *cp = '\0';
810: if (*tmp == '\0')
811: goto out;
812: if ((user = strdup(tmp)) == NULL)
813: goto out;
814: tmp = cp + 1;
815: }
816: /* Extract mandatory hostname */
817: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
818: goto out;
819: host = xstrdup(cleanhostname(cp));
820: /* Convert and verify optional port */
821: if (tmp != NULL && *tmp != '\0') {
822: if ((port = a2port(tmp)) <= 0)
823: goto out;
824: }
825: /* Success */
826: if (userp != NULL) {
827: *userp = user;
828: user = NULL;
829: }
830: if (hostp != NULL) {
831: *hostp = host;
832: host = NULL;
833: }
834: if (portp != NULL)
835: *portp = port;
836: ret = 0;
837: out:
838: free(sdup);
839: free(user);
840: free(host);
841: return ret;
1.7 mouring 842: }
843:
1.114 millert 844: /*
845: * Converts a two-byte hex string to decimal.
846: * Returns the decimal value or -1 for invalid input.
847: */
848: static int
849: hexchar(const char *s)
850: {
851: unsigned char result[2];
852: int i;
853:
854: for (i = 0; i < 2; i++) {
855: if (s[i] >= '0' && s[i] <= '9')
856: result[i] = (unsigned char)(s[i] - '0');
857: else if (s[i] >= 'a' && s[i] <= 'f')
858: result[i] = (unsigned char)(s[i] - 'a') + 10;
859: else if (s[i] >= 'A' && s[i] <= 'F')
860: result[i] = (unsigned char)(s[i] - 'A') + 10;
861: else
862: return -1;
863: }
864: return (result[0] << 4) | result[1];
865: }
866:
867: /*
868: * Decode an url-encoded string.
869: * Returns a newly allocated string on success or NULL on failure.
870: */
871: static char *
872: urldecode(const char *src)
873: {
874: char *ret, *dst;
875: int ch;
876:
877: ret = xmalloc(strlen(src) + 1);
878: for (dst = ret; *src != '\0'; src++) {
879: switch (*src) {
880: case '+':
881: *dst++ = ' ';
882: break;
883: case '%':
884: if (!isxdigit((unsigned char)src[1]) ||
885: !isxdigit((unsigned char)src[2]) ||
886: (ch = hexchar(src + 1)) == -1) {
887: free(ret);
888: return NULL;
889: }
890: *dst++ = ch;
891: src += 2;
892: break;
893: default:
894: *dst++ = *src;
895: break;
896: }
897: }
898: *dst = '\0';
899:
900: return ret;
901: }
902:
903: /*
904: * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
905: * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
906: * Either user or path may be url-encoded (but not host or port).
907: * Caller must free returned user, host and path.
908: * Any of the pointer return arguments may be NULL (useful for syntax checking)
909: * but the scheme must always be specified.
910: * If user was not specified then *userp will be set to NULL.
911: * If port was not specified then *portp will be -1.
912: * If path was not specified then *pathp will be set to NULL.
913: * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
914: */
915: int
916: parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
917: int *portp, char **pathp)
918: {
919: char *uridup, *cp, *tmp, ch;
920: char *user = NULL, *host = NULL, *path = NULL;
921: int port = -1, ret = -1;
922: size_t len;
923:
924: len = strlen(scheme);
925: if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
926: return 1;
927: uri += len + 3;
928:
929: if (userp != NULL)
930: *userp = NULL;
931: if (hostp != NULL)
932: *hostp = NULL;
933: if (portp != NULL)
934: *portp = -1;
935: if (pathp != NULL)
936: *pathp = NULL;
937:
938: uridup = tmp = xstrdup(uri);
939:
940: /* Extract optional ssh-info (username + connection params) */
941: if ((cp = strchr(tmp, '@')) != NULL) {
942: char *delim;
943:
944: *cp = '\0';
945: /* Extract username and connection params */
946: if ((delim = strchr(tmp, ';')) != NULL) {
947: /* Just ignore connection params for now */
948: *delim = '\0';
949: }
950: if (*tmp == '\0') {
951: /* Empty username */
952: goto out;
953: }
954: if ((user = urldecode(tmp)) == NULL)
955: goto out;
956: tmp = cp + 1;
957: }
958:
959: /* Extract mandatory hostname */
960: if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
961: goto out;
962: host = xstrdup(cleanhostname(cp));
963: if (!valid_domain(host, 0, NULL))
964: goto out;
965:
966: if (tmp != NULL && *tmp != '\0') {
967: if (ch == ':') {
968: /* Convert and verify port. */
969: if ((cp = strchr(tmp, '/')) != NULL)
970: *cp = '\0';
971: if ((port = a2port(tmp)) <= 0)
972: goto out;
973: tmp = cp ? cp + 1 : NULL;
974: }
975: if (tmp != NULL && *tmp != '\0') {
976: /* Extract optional path */
977: if ((path = urldecode(tmp)) == NULL)
978: goto out;
979: }
980: }
981:
982: /* Success */
983: if (userp != NULL) {
984: *userp = user;
985: user = NULL;
986: }
987: if (hostp != NULL) {
988: *hostp = host;
989: host = NULL;
990: }
991: if (portp != NULL)
992: *portp = port;
993: if (pathp != NULL) {
994: *pathp = path;
995: path = NULL;
996: }
997: ret = 0;
998: out:
999: free(uridup);
1000: free(user);
1001: free(host);
1002: free(path);
1003: return ret;
1004: }
1005:
1.12 markus 1006: /* function to assist building execv() arguments */
1.7 mouring 1007: void
1008: addargs(arglist *args, char *fmt, ...)
1009: {
1010: va_list ap;
1.42 djm 1011: char *cp;
1.25 avsm 1012: u_int nalloc;
1.42 djm 1013: int r;
1.7 mouring 1014:
1015: va_start(ap, fmt);
1.42 djm 1016: r = vasprintf(&cp, fmt, ap);
1.7 mouring 1017: va_end(ap);
1.42 djm 1018: if (r == -1)
1019: fatal("addargs: argument too long");
1.7 mouring 1020:
1.22 markus 1021: nalloc = args->nalloc;
1.7 mouring 1022: if (args->list == NULL) {
1.22 markus 1023: nalloc = 32;
1.7 mouring 1024: args->num = 0;
1.22 markus 1025: } else if (args->num+2 >= nalloc)
1026: nalloc *= 2;
1.7 mouring 1027:
1.110 deraadt 1028: args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *));
1.22 markus 1029: args->nalloc = nalloc;
1.42 djm 1030: args->list[args->num++] = cp;
1.7 mouring 1031: args->list[args->num] = NULL;
1.42 djm 1032: }
1033:
1034: void
1035: replacearg(arglist *args, u_int which, char *fmt, ...)
1036: {
1037: va_list ap;
1038: char *cp;
1039: int r;
1040:
1041: va_start(ap, fmt);
1042: r = vasprintf(&cp, fmt, ap);
1043: va_end(ap);
1044: if (r == -1)
1045: fatal("replacearg: argument too long");
1046:
1047: if (which >= args->num)
1048: fatal("replacearg: tried to replace invalid arg %d >= %d",
1049: which, args->num);
1.89 djm 1050: free(args->list[which]);
1.42 djm 1051: args->list[which] = cp;
1052: }
1053:
1054: void
1055: freeargs(arglist *args)
1056: {
1057: u_int i;
1058:
1059: if (args->list != NULL) {
1060: for (i = 0; i < args->num; i++)
1.89 djm 1061: free(args->list[i]);
1062: free(args->list);
1.42 djm 1063: args->nalloc = args->num = 0;
1064: args->list = NULL;
1065: }
1.30 djm 1066: }
1067:
1068: /*
1069: * Expands tildes in the file name. Returns data allocated by xmalloc.
1070: * Warning: this calls getpw*.
1071: */
1.169 djm 1072: int
1073: tilde_expand(const char *filename, uid_t uid, char **retp)
1.30 djm 1074: {
1.172 ! djm 1075: char *ocopy = NULL, *copy, *s = NULL;
! 1076: const char *path = NULL, *user = NULL;
1.30 djm 1077: struct passwd *pw;
1.172 ! djm 1078: size_t len;
! 1079: int ret = -1, r, slash;
1.30 djm 1080:
1.172 ! djm 1081: *retp = NULL;
1.169 djm 1082: if (*filename != '~') {
1083: *retp = xstrdup(filename);
1084: return 0;
1085: }
1.172 ! djm 1086: ocopy = copy = xstrdup(filename + 1);
1.30 djm 1087:
1.172 ! djm 1088: if (*copy == '\0') /* ~ */
! 1089: path = NULL;
! 1090: else if (*copy == '/') {
! 1091: copy += strspn(copy, "/");
! 1092: if (*copy == '\0')
! 1093: path = NULL; /* ~/ */
! 1094: else
! 1095: path = copy; /* ~/path */
! 1096: } else {
! 1097: user = copy;
! 1098: if ((path = strchr(copy, '/')) != NULL) {
! 1099: copy[path - copy] = '\0';
! 1100: path++;
! 1101: path += strspn(path, "/");
! 1102: if (*path == '\0') /* ~user/ */
! 1103: path = NULL;
! 1104: /* else ~user/path */
1.169 djm 1105: }
1.172 ! djm 1106: /* else ~user */
! 1107: }
! 1108: if (user != NULL) {
1.169 djm 1109: if ((pw = getpwnam(user)) == NULL) {
1110: error_f("No such user %s", user);
1.172 ! djm 1111: goto out;
1.169 djm 1112: }
1.172 ! djm 1113: } else if ((pw = getpwuid(uid)) == NULL) {
1.169 djm 1114: error_f("No such uid %ld", (long)uid);
1.172 ! djm 1115: goto out;
1.169 djm 1116: }
1.30 djm 1117:
1118: /* Make sure directory has a trailing '/' */
1.172 ! djm 1119: slash = (len = strlen(pw->pw_dir)) == 0 || pw->pw_dir[len - 1] != '/';
1.30 djm 1120:
1.172 ! djm 1121: if ((r = xasprintf(&s, "%s%s%s", pw->pw_dir,
! 1122: slash ? "/" : "", path != NULL ? path : "")) <= 0) {
! 1123: error_f("xasprintf failed");
! 1124: goto out;
! 1125: }
! 1126: if (r >= PATH_MAX) {
1.169 djm 1127: error_f("Path too long");
1.172 ! djm 1128: goto out;
1.169 djm 1129: }
1.172 ! djm 1130: /* success */
! 1131: ret = 0;
! 1132: *retp = s;
! 1133: s = NULL;
! 1134: out:
! 1135: free(s);
! 1136: free(ocopy);
! 1137: return ret;
1.169 djm 1138: }
1139:
1140: char *
1141: tilde_expand_filename(const char *filename, uid_t uid)
1142: {
1143: char *ret;
1.30 djm 1144:
1.169 djm 1145: if (tilde_expand(filename, uid, &ret) != 0)
1146: cleanup_exit(255);
1147: return ret;
1.31 djm 1148: }
1149:
1150: /*
1.150 dtucker 1151: * Expand a string with a set of %[char] escapes and/or ${ENVIRONMENT}
1152: * substitutions. A number of escapes may be specified as
1153: * (char *escape_chars, char *replacement) pairs. The list must be terminated
1154: * by a NULL escape_char. Returns replaced string in memory allocated by
1155: * xmalloc which the caller must free.
1.31 djm 1156: */
1.150 dtucker 1157: static char *
1158: vdollar_percent_expand(int *parseerror, int dollar, int percent,
1159: const char *string, va_list ap)
1.31 djm 1160: {
1161: #define EXPAND_MAX_KEYS 16
1.150 dtucker 1162: u_int num_keys = 0, i;
1.31 djm 1163: struct {
1164: const char *key;
1165: const char *repl;
1166: } keys[EXPAND_MAX_KEYS];
1.140 djm 1167: struct sshbuf *buf;
1.150 dtucker 1168: int r, missingvar = 0;
1169: char *ret = NULL, *var, *varend, *val;
1170: size_t len;
1.140 djm 1171:
1172: if ((buf = sshbuf_new()) == NULL)
1.155 djm 1173: fatal_f("sshbuf_new failed");
1.150 dtucker 1174: if (parseerror == NULL)
1.155 djm 1175: fatal_f("null parseerror arg");
1.150 dtucker 1176: *parseerror = 1;
1177:
1178: /* Gather keys if we're doing percent expansion. */
1179: if (percent) {
1180: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
1181: keys[num_keys].key = va_arg(ap, char *);
1182: if (keys[num_keys].key == NULL)
1183: break;
1184: keys[num_keys].repl = va_arg(ap, char *);
1.155 djm 1185: if (keys[num_keys].repl == NULL) {
1186: fatal_f("NULL replacement for token %s",
1187: keys[num_keys].key);
1188: }
1.150 dtucker 1189: }
1190: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
1.155 djm 1191: fatal_f("too many keys");
1.150 dtucker 1192: if (num_keys == 0)
1.155 djm 1193: fatal_f("percent expansion without token list");
1.31 djm 1194: }
1195:
1196: /* Expand string */
1197: for (i = 0; *string != '\0'; string++) {
1.150 dtucker 1198: /* Optionally process ${ENVIRONMENT} expansions. */
1199: if (dollar && string[0] == '$' && string[1] == '{') {
1200: string += 2; /* skip over '${' */
1201: if ((varend = strchr(string, '}')) == NULL) {
1.155 djm 1202: error_f("environment variable '%s' missing "
1.164 djm 1203: "closing '}'", string);
1.150 dtucker 1204: goto out;
1205: }
1206: len = varend - string;
1207: if (len == 0) {
1.155 djm 1208: error_f("zero-length environment variable");
1.150 dtucker 1209: goto out;
1210: }
1211: var = xmalloc(len + 1);
1212: (void)strlcpy(var, string, len + 1);
1213: if ((val = getenv(var)) == NULL) {
1.155 djm 1214: error_f("env var ${%s} has no value", var);
1.150 dtucker 1215: missingvar = 1;
1216: } else {
1.155 djm 1217: debug3_f("expand ${%s} -> '%s'", var, val);
1.150 dtucker 1218: if ((r = sshbuf_put(buf, val, strlen(val))) !=0)
1.155 djm 1219: fatal_fr(r, "sshbuf_put ${}");
1.150 dtucker 1220: }
1221: free(var);
1222: string += len;
1223: continue;
1224: }
1225:
1226: /*
1227: * Process percent expansions if we have a list of TOKENs.
1228: * If we're not doing percent expansion everything just gets
1229: * appended here.
1230: */
1231: if (*string != '%' || !percent) {
1.31 djm 1232: append:
1.155 djm 1233: if ((r = sshbuf_put_u8(buf, *string)) != 0)
1234: fatal_fr(r, "sshbuf_put_u8 %%");
1.31 djm 1235: continue;
1236: }
1237: string++;
1.73 djm 1238: /* %% case */
1.31 djm 1239: if (*string == '%')
1240: goto append;
1.150 dtucker 1241: if (*string == '\0') {
1.155 djm 1242: error_f("invalid format");
1.150 dtucker 1243: goto out;
1244: }
1.140 djm 1245: for (i = 0; i < num_keys; i++) {
1246: if (strchr(keys[i].key, *string) != NULL) {
1247: if ((r = sshbuf_put(buf, keys[i].repl,
1.155 djm 1248: strlen(keys[i].repl))) != 0)
1249: fatal_fr(r, "sshbuf_put %%-repl");
1.31 djm 1250: break;
1251: }
1252: }
1.150 dtucker 1253: if (i >= num_keys) {
1.155 djm 1254: error_f("unknown key %%%c", *string);
1.150 dtucker 1255: goto out;
1256: }
1.31 djm 1257: }
1.150 dtucker 1258: if (!missingvar && (ret = sshbuf_dup_string(buf)) == NULL)
1.155 djm 1259: fatal_f("sshbuf_dup_string failed");
1.150 dtucker 1260: *parseerror = 0;
1261: out:
1.140 djm 1262: sshbuf_free(buf);
1.150 dtucker 1263: return *parseerror ? NULL : ret;
1264: #undef EXPAND_MAX_KEYS
1265: }
1266:
1.152 dtucker 1267: /*
1268: * Expand only environment variables.
1269: * Note that although this function is variadic like the other similar
1270: * functions, any such arguments will be unused.
1271: */
1272:
1.150 dtucker 1273: char *
1.152 dtucker 1274: dollar_expand(int *parseerr, const char *string, ...)
1.150 dtucker 1275: {
1276: char *ret;
1277: int err;
1.152 dtucker 1278: va_list ap;
1.150 dtucker 1279:
1.152 dtucker 1280: va_start(ap, string);
1281: ret = vdollar_percent_expand(&err, 1, 0, string, ap);
1282: va_end(ap);
1.150 dtucker 1283: if (parseerr != NULL)
1284: *parseerr = err;
1285: return ret;
1286: }
1287:
1288: /*
1289: * Returns expanded string or NULL if a specified environment variable is
1290: * not defined, or calls fatal if the string is invalid.
1291: */
1292: char *
1293: percent_expand(const char *string, ...)
1294: {
1295: char *ret;
1296: int err;
1297: va_list ap;
1298:
1299: va_start(ap, string);
1300: ret = vdollar_percent_expand(&err, 0, 1, string, ap);
1301: va_end(ap);
1302: if (err)
1.155 djm 1303: fatal_f("failed");
1.150 dtucker 1304: return ret;
1305: }
1306:
1307: /*
1308: * Returns expanded string or NULL if a specified environment variable is
1309: * not defined, or calls fatal if the string is invalid.
1310: */
1311: char *
1312: percent_dollar_expand(const char *string, ...)
1313: {
1314: char *ret;
1315: int err;
1316: va_list ap;
1317:
1318: va_start(ap, string);
1319: ret = vdollar_percent_expand(&err, 1, 1, string, ap);
1320: va_end(ap);
1321: if (err)
1.155 djm 1322: fatal_f("failed");
1.140 djm 1323: return ret;
1.36 reyk 1324: }
1325:
1326: int
1.115 djm 1327: tun_open(int tun, int mode, char **ifname)
1.36 reyk 1328: {
1.37 reyk 1329: struct ifreq ifr;
1.36 reyk 1330: char name[100];
1.37 reyk 1331: int fd = -1, sock;
1.99 sthen 1332: const char *tunbase = "tun";
1333:
1.115 djm 1334: if (ifname != NULL)
1335: *ifname = NULL;
1336:
1.99 sthen 1337: if (mode == SSH_TUNMODE_ETHERNET)
1338: tunbase = "tap";
1.36 reyk 1339:
1.37 reyk 1340: /* Open the tunnel device */
1341: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 1342: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 1343: fd = open(name, O_RDWR);
1344: } else if (tun == SSH_TUNID_ANY) {
1345: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 1346: snprintf(name, sizeof(name), "/dev/%s%d",
1347: tunbase, tun);
1.37 reyk 1348: if ((fd = open(name, O_RDWR)) >= 0)
1349: break;
1.36 reyk 1350: }
1351: } else {
1.155 djm 1352: debug_f("invalid tunnel %u", tun);
1.98 djm 1353: return -1;
1.37 reyk 1354: }
1355:
1.139 deraadt 1356: if (fd == -1) {
1.155 djm 1357: debug_f("%s open: %s", name, strerror(errno));
1.98 djm 1358: return -1;
1.36 reyk 1359: }
1.37 reyk 1360:
1.155 djm 1361: debug_f("%s mode %d fd %d", name, mode, fd);
1.37 reyk 1362:
1.99 sthen 1363: /* Bring interface up if it is not already */
1364: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
1365: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 1366: goto failed;
1367:
1.98 djm 1368: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
1.155 djm 1369: debug_f("get interface %s flags: %s", ifr.ifr_name,
1370: strerror(errno));
1.37 reyk 1371: goto failed;
1.98 djm 1372: }
1.40 reyk 1373:
1.98 djm 1374: if (!(ifr.ifr_flags & IFF_UP)) {
1375: ifr.ifr_flags |= IFF_UP;
1376: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
1.155 djm 1377: debug_f("activate interface %s: %s", ifr.ifr_name,
1378: strerror(errno));
1.98 djm 1379: goto failed;
1380: }
1381: }
1.115 djm 1382:
1383: if (ifname != NULL)
1384: *ifname = xstrdup(ifr.ifr_name);
1.37 reyk 1385:
1386: close(sock);
1.98 djm 1387: return fd;
1.37 reyk 1388:
1389: failed:
1390: if (fd >= 0)
1391: close(fd);
1392: if (sock >= 0)
1393: close(sock);
1.98 djm 1394: return -1;
1.35 djm 1395: }
1396:
1397: void
1398: sanitise_stdfd(void)
1399: {
1.41 djm 1400: int nullfd, dupfd;
1.35 djm 1401:
1.41 djm 1402: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 1403: fprintf(stderr, "Couldn't open /dev/null: %s\n",
1404: strerror(errno));
1.35 djm 1405: exit(1);
1406: }
1.103 krw 1407: while (++dupfd <= STDERR_FILENO) {
1408: /* Only populate closed fds. */
1409: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
1410: if (dup2(nullfd, dupfd) == -1) {
1411: fprintf(stderr, "dup2: %s\n", strerror(errno));
1412: exit(1);
1413: }
1.35 djm 1414: }
1415: }
1.103 krw 1416: if (nullfd > STDERR_FILENO)
1.35 djm 1417: close(nullfd);
1.1 markus 1418: }
1.33 djm 1419:
1420: char *
1.52 djm 1421: tohex(const void *vp, size_t l)
1.33 djm 1422: {
1.52 djm 1423: const u_char *p = (const u_char *)vp;
1.33 djm 1424: char b[3], *r;
1.52 djm 1425: size_t i, hl;
1426:
1427: if (l > 65536)
1428: return xstrdup("tohex: length > 65536");
1.33 djm 1429:
1430: hl = l * 2 + 1;
1.49 djm 1431: r = xcalloc(1, hl);
1.33 djm 1432: for (i = 0; i < l; i++) {
1.52 djm 1433: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 1434: strlcat(r, b, hl);
1435: }
1436: return (r);
1437: }
1.145 djm 1438:
1439: /*
1440: * Extend string *sp by the specified format. If *sp is not NULL (or empty),
1441: * then the separator 'sep' will be prepended before the formatted arguments.
1442: * Extended strings are heap allocated.
1443: */
1444: void
1445: xextendf(char **sp, const char *sep, const char *fmt, ...)
1446: {
1447: va_list ap;
1448: char *tmp1, *tmp2;
1449:
1450: va_start(ap, fmt);
1451: xvasprintf(&tmp1, fmt, ap);
1452: va_end(ap);
1453:
1454: if (*sp == NULL || **sp == '\0') {
1455: free(*sp);
1456: *sp = tmp1;
1457: return;
1458: }
1459: xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL ? "" : sep, tmp1);
1460: free(tmp1);
1461: free(*sp);
1462: *sp = tmp2;
1463: }
1464:
1.33 djm 1465:
1.52 djm 1466: u_int64_t
1467: get_u64(const void *vp)
1468: {
1469: const u_char *p = (const u_char *)vp;
1470: u_int64_t v;
1471:
1472: v = (u_int64_t)p[0] << 56;
1473: v |= (u_int64_t)p[1] << 48;
1474: v |= (u_int64_t)p[2] << 40;
1475: v |= (u_int64_t)p[3] << 32;
1476: v |= (u_int64_t)p[4] << 24;
1477: v |= (u_int64_t)p[5] << 16;
1478: v |= (u_int64_t)p[6] << 8;
1479: v |= (u_int64_t)p[7];
1480:
1481: return (v);
1482: }
1483:
1484: u_int32_t
1485: get_u32(const void *vp)
1486: {
1487: const u_char *p = (const u_char *)vp;
1488: u_int32_t v;
1489:
1490: v = (u_int32_t)p[0] << 24;
1491: v |= (u_int32_t)p[1] << 16;
1492: v |= (u_int32_t)p[2] << 8;
1493: v |= (u_int32_t)p[3];
1494:
1495: return (v);
1496: }
1497:
1.93 djm 1498: u_int32_t
1499: get_u32_le(const void *vp)
1500: {
1501: const u_char *p = (const u_char *)vp;
1502: u_int32_t v;
1503:
1504: v = (u_int32_t)p[0];
1505: v |= (u_int32_t)p[1] << 8;
1506: v |= (u_int32_t)p[2] << 16;
1507: v |= (u_int32_t)p[3] << 24;
1508:
1509: return (v);
1510: }
1511:
1.52 djm 1512: u_int16_t
1513: get_u16(const void *vp)
1514: {
1515: const u_char *p = (const u_char *)vp;
1516: u_int16_t v;
1517:
1518: v = (u_int16_t)p[0] << 8;
1519: v |= (u_int16_t)p[1];
1520:
1521: return (v);
1522: }
1523:
1524: void
1525: put_u64(void *vp, u_int64_t v)
1526: {
1527: u_char *p = (u_char *)vp;
1528:
1529: p[0] = (u_char)(v >> 56) & 0xff;
1530: p[1] = (u_char)(v >> 48) & 0xff;
1531: p[2] = (u_char)(v >> 40) & 0xff;
1532: p[3] = (u_char)(v >> 32) & 0xff;
1533: p[4] = (u_char)(v >> 24) & 0xff;
1534: p[5] = (u_char)(v >> 16) & 0xff;
1535: p[6] = (u_char)(v >> 8) & 0xff;
1536: p[7] = (u_char)v & 0xff;
1537: }
1538:
1539: void
1540: put_u32(void *vp, u_int32_t v)
1541: {
1542: u_char *p = (u_char *)vp;
1543:
1544: p[0] = (u_char)(v >> 24) & 0xff;
1545: p[1] = (u_char)(v >> 16) & 0xff;
1546: p[2] = (u_char)(v >> 8) & 0xff;
1547: p[3] = (u_char)v & 0xff;
1548: }
1549:
1.93 djm 1550: void
1551: put_u32_le(void *vp, u_int32_t v)
1552: {
1553: u_char *p = (u_char *)vp;
1554:
1555: p[0] = (u_char)v & 0xff;
1556: p[1] = (u_char)(v >> 8) & 0xff;
1557: p[2] = (u_char)(v >> 16) & 0xff;
1558: p[3] = (u_char)(v >> 24) & 0xff;
1559: }
1.52 djm 1560:
1561: void
1562: put_u16(void *vp, u_int16_t v)
1563: {
1564: u_char *p = (u_char *)vp;
1565:
1566: p[0] = (u_char)(v >> 8) & 0xff;
1567: p[1] = (u_char)v & 0xff;
1568: }
1.68 dtucker 1569:
1570: void
1571: ms_subtract_diff(struct timeval *start, int *ms)
1572: {
1573: struct timeval diff, finish;
1574:
1.119 dtucker 1575: monotime_tv(&finish);
1576: timersub(&finish, start, &diff);
1.68 dtucker 1577: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
1578: }
1579:
1580: void
1.171 deraadt 1581: ms_to_timespec(struct timespec *ts, int ms)
1.68 dtucker 1582: {
1583: if (ms < 0)
1584: ms = 0;
1.171 deraadt 1585: ts->tv_sec = ms / 1000;
1586: ts->tv_nsec = (ms % 1000) * 1000 * 1000;
1.90 dtucker 1587: }
1588:
1.119 dtucker 1589: void
1590: monotime_ts(struct timespec *ts)
1591: {
1592: if (clock_gettime(CLOCK_MONOTONIC, ts) != 0)
1593: fatal("clock_gettime: %s", strerror(errno));
1594: }
1595:
1596: void
1597: monotime_tv(struct timeval *tv)
1598: {
1599: struct timespec ts;
1600:
1601: monotime_ts(&ts);
1602: tv->tv_sec = ts.tv_sec;
1603: tv->tv_usec = ts.tv_nsec / 1000;
1604: }
1605:
1.90 dtucker 1606: time_t
1607: monotime(void)
1608: {
1609: struct timespec ts;
1610:
1.119 dtucker 1611: monotime_ts(&ts);
1.90 dtucker 1612: return (ts.tv_sec);
1.102 dtucker 1613: }
1614:
1615: double
1616: monotime_double(void)
1617: {
1618: struct timespec ts;
1619:
1.119 dtucker 1620: monotime_ts(&ts);
1621: return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
1.81 djm 1622: }
1623:
1624: void
1625: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
1626: {
1627: bw->buflen = buflen;
1628: bw->rate = kbps;
1.135 dtucker 1629: bw->thresh = buflen;
1.81 djm 1630: bw->lamt = 0;
1631: timerclear(&bw->bwstart);
1632: timerclear(&bw->bwend);
1.135 dtucker 1633: }
1.81 djm 1634:
1635: /* Callback from read/write loop to insert bandwidth-limiting delays */
1636: void
1637: bandwidth_limit(struct bwlimit *bw, size_t read_len)
1638: {
1639: u_int64_t waitlen;
1640: struct timespec ts, rm;
1641:
1.135 dtucker 1642: bw->lamt += read_len;
1.81 djm 1643: if (!timerisset(&bw->bwstart)) {
1.119 dtucker 1644: monotime_tv(&bw->bwstart);
1.81 djm 1645: return;
1646: }
1647: if (bw->lamt < bw->thresh)
1648: return;
1649:
1.119 dtucker 1650: monotime_tv(&bw->bwend);
1.81 djm 1651: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
1652: if (!timerisset(&bw->bwend))
1653: return;
1654:
1655: bw->lamt *= 8;
1656: waitlen = (double)1000000L * bw->lamt / bw->rate;
1657:
1658: bw->bwstart.tv_sec = waitlen / 1000000L;
1659: bw->bwstart.tv_usec = waitlen % 1000000L;
1660:
1661: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
1662: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
1663:
1664: /* Adjust the wait time */
1665: if (bw->bwend.tv_sec) {
1666: bw->thresh /= 2;
1667: if (bw->thresh < bw->buflen / 4)
1668: bw->thresh = bw->buflen / 4;
1669: } else if (bw->bwend.tv_usec < 10000) {
1670: bw->thresh *= 2;
1671: if (bw->thresh > bw->buflen * 8)
1672: bw->thresh = bw->buflen * 8;
1673: }
1674:
1675: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1676: while (nanosleep(&ts, &rm) == -1) {
1677: if (errno != EINTR)
1678: break;
1679: ts = rm;
1680: }
1681: }
1682:
1683: bw->lamt = 0;
1.119 dtucker 1684: monotime_tv(&bw->bwstart);
1.84 djm 1685: }
1686:
1687: /* Make a template filename for mk[sd]temp() */
1688: void
1689: mktemp_proto(char *s, size_t len)
1690: {
1691: const char *tmpdir;
1692: int r;
1693:
1694: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1695: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1696: if (r > 0 && (size_t)r < len)
1697: return;
1698: }
1699: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1700: if (r < 0 || (size_t)r >= len)
1.155 djm 1701: fatal_f("template string too short");
1.68 dtucker 1702: }
1.83 djm 1703:
1704: static const struct {
1705: const char *name;
1706: int value;
1707: } ipqos[] = {
1.111 djm 1708: { "none", INT_MAX }, /* can't use 0 here; that's CS0 */
1.83 djm 1709: { "af11", IPTOS_DSCP_AF11 },
1710: { "af12", IPTOS_DSCP_AF12 },
1711: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 1712: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 1713: { "af22", IPTOS_DSCP_AF22 },
1714: { "af23", IPTOS_DSCP_AF23 },
1715: { "af31", IPTOS_DSCP_AF31 },
1716: { "af32", IPTOS_DSCP_AF32 },
1717: { "af33", IPTOS_DSCP_AF33 },
1718: { "af41", IPTOS_DSCP_AF41 },
1719: { "af42", IPTOS_DSCP_AF42 },
1720: { "af43", IPTOS_DSCP_AF43 },
1721: { "cs0", IPTOS_DSCP_CS0 },
1722: { "cs1", IPTOS_DSCP_CS1 },
1723: { "cs2", IPTOS_DSCP_CS2 },
1724: { "cs3", IPTOS_DSCP_CS3 },
1725: { "cs4", IPTOS_DSCP_CS4 },
1726: { "cs5", IPTOS_DSCP_CS5 },
1727: { "cs6", IPTOS_DSCP_CS6 },
1728: { "cs7", IPTOS_DSCP_CS7 },
1729: { "ef", IPTOS_DSCP_EF },
1.146 djm 1730: { "le", IPTOS_DSCP_LE },
1.83 djm 1731: { "lowdelay", IPTOS_LOWDELAY },
1732: { "throughput", IPTOS_THROUGHPUT },
1733: { "reliability", IPTOS_RELIABILITY },
1734: { NULL, -1 }
1735: };
1736:
1737: int
1738: parse_ipqos(const char *cp)
1739: {
1740: u_int i;
1741: char *ep;
1742: long val;
1743:
1744: if (cp == NULL)
1745: return -1;
1746: for (i = 0; ipqos[i].name != NULL; i++) {
1747: if (strcasecmp(cp, ipqos[i].name) == 0)
1748: return ipqos[i].value;
1749: }
1750: /* Try parsing as an integer */
1751: val = strtol(cp, &ep, 0);
1752: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1753: return -1;
1754: return val;
1755: }
1756:
1.85 stevesk 1757: const char *
1758: iptos2str(int iptos)
1759: {
1760: int i;
1761: static char iptos_str[sizeof "0xff"];
1762:
1763: for (i = 0; ipqos[i].name != NULL; i++) {
1764: if (ipqos[i].value == iptos)
1765: return ipqos[i].name;
1766: }
1767: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1768: return iptos_str;
1.92 djm 1769: }
1770:
1771: void
1772: lowercase(char *s)
1773: {
1774: for (; *s; s++)
1775: *s = tolower((u_char)*s);
1.94 millert 1776: }
1777:
1778: int
1779: unix_listener(const char *path, int backlog, int unlink_first)
1780: {
1781: struct sockaddr_un sunaddr;
1782: int saved_errno, sock;
1783:
1784: memset(&sunaddr, 0, sizeof(sunaddr));
1785: sunaddr.sun_family = AF_UNIX;
1.121 djm 1786: if (strlcpy(sunaddr.sun_path, path,
1787: sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1.155 djm 1788: error_f("path \"%s\" too long for Unix domain socket", path);
1.94 millert 1789: errno = ENAMETOOLONG;
1790: return -1;
1791: }
1792:
1793: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1.139 deraadt 1794: if (sock == -1) {
1.94 millert 1795: saved_errno = errno;
1.155 djm 1796: error_f("socket: %.100s", strerror(errno));
1.94 millert 1797: errno = saved_errno;
1798: return -1;
1799: }
1800: if (unlink_first == 1) {
1801: if (unlink(path) != 0 && errno != ENOENT)
1802: error("unlink(%s): %.100s", path, strerror(errno));
1803: }
1.139 deraadt 1804: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1.94 millert 1805: saved_errno = errno;
1.155 djm 1806: error_f("cannot bind to path %s: %s", path, strerror(errno));
1.122 djm 1807: close(sock);
1.94 millert 1808: errno = saved_errno;
1809: return -1;
1810: }
1.139 deraadt 1811: if (listen(sock, backlog) == -1) {
1.94 millert 1812: saved_errno = errno;
1.155 djm 1813: error_f("cannot listen on path %s: %s", path, strerror(errno));
1.94 millert 1814: close(sock);
1815: unlink(path);
1816: errno = saved_errno;
1817: return -1;
1818: }
1819: return sock;
1.85 stevesk 1820: }
1.104 djm 1821:
1822: /*
1823: * Compares two strings that maybe be NULL. Returns non-zero if strings
1824: * are both NULL or are identical, returns zero otherwise.
1825: */
1826: static int
1827: strcmp_maybe_null(const char *a, const char *b)
1828: {
1829: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1830: return 0;
1831: if (a != NULL && strcmp(a, b) != 0)
1832: return 0;
1833: return 1;
1834: }
1835:
1836: /*
1837: * Compare two forwards, returning non-zero if they are identical or
1838: * zero otherwise.
1839: */
1840: int
1841: forward_equals(const struct Forward *a, const struct Forward *b)
1842: {
1843: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1844: return 0;
1845: if (a->listen_port != b->listen_port)
1846: return 0;
1847: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1848: return 0;
1849: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1850: return 0;
1851: if (a->connect_port != b->connect_port)
1852: return 0;
1853: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1854: return 0;
1855: /* allocated_port and handle are not checked */
1.107 dtucker 1856: return 1;
1857: }
1858:
1859: /* returns 1 if process is already daemonized, 0 otherwise */
1860: int
1861: daemonized(void)
1862: {
1863: int fd;
1864:
1865: if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1866: close(fd);
1867: return 0; /* have controlling terminal */
1868: }
1869: if (getppid() != 1)
1870: return 0; /* parent is not init */
1871: if (getsid(0) != getpid())
1872: return 0; /* not session leader */
1873: debug3("already daemonized");
1.106 dtucker 1874: return 1;
1875: }
1.112 djm 1876:
1877: /*
1878: * Splits 's' into an argument vector. Handles quoted string and basic
1879: * escape characters (\\, \", \'). Caller must free the argument vector
1880: * and its members.
1881: */
1882: int
1.166 djm 1883: argv_split(const char *s, int *argcp, char ***argvp, int terminate_on_comment)
1.112 djm 1884: {
1885: int r = SSH_ERR_INTERNAL_ERROR;
1886: int argc = 0, quote, i, j;
1887: char *arg, **argv = xcalloc(1, sizeof(*argv));
1888:
1889: *argvp = NULL;
1890: *argcp = 0;
1891:
1892: for (i = 0; s[i] != '\0'; i++) {
1893: /* Skip leading whitespace */
1894: if (s[i] == ' ' || s[i] == '\t')
1895: continue;
1.166 djm 1896: if (terminate_on_comment && s[i] == '#')
1897: break;
1.112 djm 1898: /* Start of a token */
1899: quote = 0;
1900:
1901: argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
1902: arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
1903: argv[argc] = NULL;
1904:
1905: /* Copy the token in, removing escapes */
1906: for (j = 0; s[i] != '\0'; i++) {
1907: if (s[i] == '\\') {
1908: if (s[i + 1] == '\'' ||
1909: s[i + 1] == '\"' ||
1.166 djm 1910: s[i + 1] == '\\' ||
1911: (quote == 0 && s[i + 1] == ' ')) {
1.112 djm 1912: i++; /* Skip '\' */
1913: arg[j++] = s[i];
1914: } else {
1915: /* Unrecognised escape */
1916: arg[j++] = s[i];
1917: }
1918: } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
1919: break; /* done */
1.163 djm 1920: else if (quote == 0 && (s[i] == '\"' || s[i] == '\''))
1921: quote = s[i]; /* quote start */
1.112 djm 1922: else if (quote != 0 && s[i] == quote)
1.163 djm 1923: quote = 0; /* quote end */
1.112 djm 1924: else
1925: arg[j++] = s[i];
1926: }
1927: if (s[i] == '\0') {
1928: if (quote != 0) {
1929: /* Ran out of string looking for close quote */
1930: r = SSH_ERR_INVALID_FORMAT;
1931: goto out;
1932: }
1933: break;
1934: }
1935: }
1936: /* Success */
1937: *argcp = argc;
1938: *argvp = argv;
1939: argc = 0;
1940: argv = NULL;
1941: r = 0;
1942: out:
1943: if (argc != 0 && argv != NULL) {
1944: for (i = 0; i < argc; i++)
1945: free(argv[i]);
1946: free(argv);
1947: }
1948: return r;
1949: }
1950:
1951: /*
1952: * Reassemble an argument vector into a string, quoting and escaping as
1953: * necessary. Caller must free returned string.
1954: */
1955: char *
1956: argv_assemble(int argc, char **argv)
1957: {
1958: int i, j, ws, r;
1959: char c, *ret;
1960: struct sshbuf *buf, *arg;
1961:
1962: if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
1.155 djm 1963: fatal_f("sshbuf_new failed");
1.112 djm 1964:
1965: for (i = 0; i < argc; i++) {
1966: ws = 0;
1967: sshbuf_reset(arg);
1968: for (j = 0; argv[i][j] != '\0'; j++) {
1969: r = 0;
1970: c = argv[i][j];
1971: switch (c) {
1972: case ' ':
1973: case '\t':
1974: ws = 1;
1975: r = sshbuf_put_u8(arg, c);
1976: break;
1977: case '\\':
1978: case '\'':
1979: case '"':
1980: if ((r = sshbuf_put_u8(arg, '\\')) != 0)
1981: break;
1982: /* FALLTHROUGH */
1983: default:
1984: r = sshbuf_put_u8(arg, c);
1985: break;
1986: }
1987: if (r != 0)
1.155 djm 1988: fatal_fr(r, "sshbuf_put_u8");
1.112 djm 1989: }
1990: if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
1991: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
1992: (r = sshbuf_putb(buf, arg)) != 0 ||
1993: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
1.155 djm 1994: fatal_fr(r, "assemble");
1.112 djm 1995: }
1996: if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
1.155 djm 1997: fatal_f("malloc failed");
1.112 djm 1998: memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
1999: ret[sshbuf_len(buf)] = '\0';
2000: sshbuf_free(buf);
2001: sshbuf_free(arg);
2002: return ret;
1.166 djm 2003: }
2004:
2005: char *
2006: argv_next(int *argcp, char ***argvp)
2007: {
2008: char *ret = (*argvp)[0];
2009:
2010: if (*argcp > 0 && ret != NULL) {
2011: (*argcp)--;
2012: (*argvp)++;
2013: }
2014: return ret;
2015: }
2016:
2017: void
2018: argv_consume(int *argcp)
2019: {
2020: *argcp = 0;
2021: }
2022:
2023: void
2024: argv_free(char **av, int ac)
2025: {
2026: int i;
2027:
2028: if (av == NULL)
2029: return;
2030: for (i = 0; i < ac; i++)
2031: free(av[i]);
2032: free(av);
1.112 djm 2033: }
2034:
2035: /* Returns 0 if pid exited cleanly, non-zero otherwise */
2036: int
1.113 djm 2037: exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
1.112 djm 2038: {
2039: int status;
2040:
2041: while (waitpid(pid, &status, 0) == -1) {
2042: if (errno != EINTR) {
1.155 djm 2043: error("%s waitpid: %s", tag, strerror(errno));
1.112 djm 2044: return -1;
2045: }
2046: }
2047: if (WIFSIGNALED(status)) {
2048: error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
2049: return -1;
2050: } else if (WEXITSTATUS(status) != 0) {
1.113 djm 2051: do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
2052: "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
1.112 djm 2053: return -1;
2054: }
2055: return 0;
2056: }
2057:
2058: /*
2059: * Check a given path for security. This is defined as all components
2060: * of the path to the file must be owned by either the owner of
2061: * of the file or root and no directories must be group or world writable.
2062: *
2063: * XXX Should any specific check be done for sym links ?
2064: *
2065: * Takes a file name, its stat information (preferably from fstat() to
2066: * avoid races), the uid of the expected owner, their home directory and an
2067: * error buffer plus max size as arguments.
2068: *
2069: * Returns 0 on success and -1 on failure
2070: */
2071: int
2072: safe_path(const char *name, struct stat *stp, const char *pw_dir,
2073: uid_t uid, char *err, size_t errlen)
2074: {
2075: char buf[PATH_MAX], homedir[PATH_MAX];
2076: char *cp;
2077: int comparehome = 0;
2078: struct stat st;
2079:
2080: if (realpath(name, buf) == NULL) {
2081: snprintf(err, errlen, "realpath %s failed: %s", name,
2082: strerror(errno));
2083: return -1;
2084: }
2085: if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
2086: comparehome = 1;
2087:
2088: if (!S_ISREG(stp->st_mode)) {
2089: snprintf(err, errlen, "%s is not a regular file", buf);
2090: return -1;
2091: }
2092: if ((stp->st_uid != 0 && stp->st_uid != uid) ||
2093: (stp->st_mode & 022) != 0) {
2094: snprintf(err, errlen, "bad ownership or modes for file %s",
2095: buf);
2096: return -1;
2097: }
2098:
2099: /* for each component of the canonical path, walking upwards */
2100: for (;;) {
2101: if ((cp = dirname(buf)) == NULL) {
2102: snprintf(err, errlen, "dirname() failed");
2103: return -1;
2104: }
2105: strlcpy(buf, cp, sizeof(buf));
2106:
1.139 deraadt 2107: if (stat(buf, &st) == -1 ||
1.112 djm 2108: (st.st_uid != 0 && st.st_uid != uid) ||
2109: (st.st_mode & 022) != 0) {
2110: snprintf(err, errlen,
2111: "bad ownership or modes for directory %s", buf);
2112: return -1;
2113: }
2114:
2115: /* If are past the homedir then we can stop */
2116: if (comparehome && strcmp(homedir, buf) == 0)
2117: break;
2118:
2119: /*
2120: * dirname should always complete with a "/" path,
2121: * but we can be paranoid and check for "." too
2122: */
2123: if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
2124: break;
2125: }
2126: return 0;
2127: }
2128:
2129: /*
2130: * Version of safe_path() that accepts an open file descriptor to
2131: * avoid races.
2132: *
2133: * Returns 0 on success and -1 on failure
2134: */
2135: int
2136: safe_path_fd(int fd, const char *file, struct passwd *pw,
2137: char *err, size_t errlen)
2138: {
2139: struct stat st;
2140:
2141: /* check the open file to avoid races */
1.139 deraadt 2142: if (fstat(fd, &st) == -1) {
1.112 djm 2143: snprintf(err, errlen, "cannot stat file %s: %s",
2144: file, strerror(errno));
2145: return -1;
2146: }
2147: return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
2148: }
2149:
2150: /*
2151: * Sets the value of the given variable in the environment. If the variable
2152: * already exists, its value is overridden.
2153: */
2154: void
2155: child_set_env(char ***envp, u_int *envsizep, const char *name,
2156: const char *value)
2157: {
2158: char **env;
2159: u_int envsize;
2160: u_int i, namelen;
2161:
2162: if (strchr(name, '=') != NULL) {
2163: error("Invalid environment variable \"%.100s\"", name);
2164: return;
2165: }
2166:
2167: /*
2168: * Find the slot where the value should be stored. If the variable
2169: * already exists, we reuse the slot; otherwise we append a new slot
2170: * at the end of the array, expanding if necessary.
2171: */
2172: env = *envp;
2173: namelen = strlen(name);
2174: for (i = 0; env[i]; i++)
2175: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
2176: break;
2177: if (env[i]) {
2178: /* Reuse the slot. */
2179: free(env[i]);
2180: } else {
2181: /* New variable. Expand if necessary. */
2182: envsize = *envsizep;
2183: if (i >= envsize - 1) {
2184: if (envsize >= 1000)
2185: fatal("child_set_env: too many env vars");
2186: envsize += 50;
2187: env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
2188: *envsizep = envsize;
2189: }
2190: /* Need to set the NULL pointer at end of array beyond the new slot. */
2191: env[i + 1] = NULL;
2192: }
2193:
2194: /* Allocate space and format the variable in the appropriate slot. */
1.125 djm 2195: /* XXX xasprintf */
1.112 djm 2196: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
2197: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
2198: }
2199:
1.114 millert 2200: /*
2201: * Check and optionally lowercase a domain name, also removes trailing '.'
2202: * Returns 1 on success and 0 on failure, storing an error message in errstr.
2203: */
2204: int
2205: valid_domain(char *name, int makelower, const char **errstr)
2206: {
2207: size_t i, l = strlen(name);
2208: u_char c, last = '\0';
2209: static char errbuf[256];
2210:
2211: if (l == 0) {
2212: strlcpy(errbuf, "empty domain name", sizeof(errbuf));
2213: goto bad;
2214: }
2215: if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
2216: snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
2217: "starts with invalid character", name);
2218: goto bad;
2219: }
2220: for (i = 0; i < l; i++) {
2221: c = tolower((u_char)name[i]);
2222: if (makelower)
2223: name[i] = (char)c;
2224: if (last == '.' && c == '.') {
2225: snprintf(errbuf, sizeof(errbuf), "domain name "
2226: "\"%.100s\" contains consecutive separators", name);
2227: goto bad;
2228: }
2229: if (c != '.' && c != '-' && !isalnum(c) &&
2230: c != '_') /* technically invalid, but common */ {
2231: snprintf(errbuf, sizeof(errbuf), "domain name "
2232: "\"%.100s\" contains invalid characters", name);
2233: goto bad;
2234: }
2235: last = c;
2236: }
2237: if (name[l - 1] == '.')
2238: name[l - 1] = '\0';
2239: if (errstr != NULL)
2240: *errstr = NULL;
2241: return 1;
2242: bad:
2243: if (errstr != NULL)
2244: *errstr = errbuf;
2245: return 0;
1.132 djm 2246: }
2247:
2248: /*
2249: * Verify that a environment variable name (not including initial '$') is
2250: * valid; consisting of one or more alphanumeric or underscore characters only.
2251: * Returns 1 on valid, 0 otherwise.
2252: */
2253: int
2254: valid_env_name(const char *name)
2255: {
2256: const char *cp;
2257:
2258: if (name[0] == '\0')
2259: return 0;
2260: for (cp = name; *cp != '\0'; cp++) {
2261: if (!isalnum((u_char)*cp) && *cp != '_')
2262: return 0;
2263: }
2264: return 1;
1.120 dtucker 2265: }
2266:
2267: const char *
2268: atoi_err(const char *nptr, int *val)
2269: {
2270: const char *errstr = NULL;
2271: long long num;
2272:
2273: if (nptr == NULL || *nptr == '\0')
2274: return "missing";
2275: num = strtonum(nptr, 0, INT_MAX, &errstr);
2276: if (errstr == NULL)
2277: *val = (int)num;
2278: return errstr;
1.127 djm 2279: }
2280:
2281: int
2282: parse_absolute_time(const char *s, uint64_t *tp)
2283: {
2284: struct tm tm;
2285: time_t tt;
2286: char buf[32], *fmt;
2287:
2288: *tp = 0;
2289:
2290: /*
2291: * POSIX strptime says "The application shall ensure that there
2292: * is white-space or other non-alphanumeric characters between
2293: * any two conversion specifications" so arrange things this way.
2294: */
2295: switch (strlen(s)) {
2296: case 8: /* YYYYMMDD */
2297: fmt = "%Y-%m-%d";
2298: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
2299: break;
2300: case 12: /* YYYYMMDDHHMM */
2301: fmt = "%Y-%m-%dT%H:%M";
2302: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s",
2303: s, s + 4, s + 6, s + 8, s + 10);
2304: break;
2305: case 14: /* YYYYMMDDHHMMSS */
2306: fmt = "%Y-%m-%dT%H:%M:%S";
2307: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
2308: s, s + 4, s + 6, s + 8, s + 10, s + 12);
2309: break;
2310: default:
2311: return SSH_ERR_INVALID_FORMAT;
2312: }
2313:
2314: memset(&tm, 0, sizeof(tm));
2315: if (strptime(buf, fmt, &tm) == NULL)
2316: return SSH_ERR_INVALID_FORMAT;
2317: if ((tt = mktime(&tm)) < 0)
2318: return SSH_ERR_INVALID_FORMAT;
2319: /* success */
2320: *tp = (uint64_t)tt;
2321: return 0;
2322: }
2323:
1.167 dtucker 2324: /* On OpenBSD time_t is int64_t which is long long. */
1.168 dtucker 2325: #define SSH_TIME_T_MAX LLONG_MAX
1.167 dtucker 2326:
1.127 djm 2327: void
2328: format_absolute_time(uint64_t t, char *buf, size_t len)
2329: {
1.167 dtucker 2330: time_t tt = t > SSH_TIME_T_MAX ? SSH_TIME_T_MAX : t;
1.127 djm 2331: struct tm tm;
2332:
2333: localtime_r(&tt, &tm);
2334: strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
1.134 djm 2335: }
2336:
2337: /* check if path is absolute */
2338: int
2339: path_absolute(const char *path)
2340: {
2341: return (*path == '/') ? 1 : 0;
1.141 djm 2342: }
2343:
2344: void
2345: skip_space(char **cpp)
2346: {
2347: char *cp;
2348:
2349: for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
2350: ;
2351: *cpp = cp;
1.114 millert 2352: }
1.142 djm 2353:
2354: /* authorized_key-style options parsing helpers */
2355:
2356: /*
2357: * Match flag 'opt' in *optsp, and if allow_negate is set then also match
2358: * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0
2359: * if negated option matches.
2360: * If the option or negated option matches, then *optsp is updated to
2361: * point to the first character after the option.
2362: */
2363: int
2364: opt_flag(const char *opt, int allow_negate, const char **optsp)
2365: {
2366: size_t opt_len = strlen(opt);
2367: const char *opts = *optsp;
2368: int negate = 0;
2369:
2370: if (allow_negate && strncasecmp(opts, "no-", 3) == 0) {
2371: opts += 3;
2372: negate = 1;
2373: }
2374: if (strncasecmp(opts, opt, opt_len) == 0) {
2375: *optsp = opts + opt_len;
2376: return negate ? 0 : 1;
2377: }
2378: return -1;
2379: }
2380:
2381: char *
2382: opt_dequote(const char **sp, const char **errstrp)
2383: {
2384: const char *s = *sp;
2385: char *ret;
2386: size_t i;
2387:
2388: *errstrp = NULL;
2389: if (*s != '"') {
2390: *errstrp = "missing start quote";
2391: return NULL;
2392: }
2393: s++;
2394: if ((ret = malloc(strlen((s)) + 1)) == NULL) {
2395: *errstrp = "memory allocation failed";
2396: return NULL;
2397: }
2398: for (i = 0; *s != '\0' && *s != '"';) {
2399: if (s[0] == '\\' && s[1] == '"')
2400: s++;
2401: ret[i++] = *s++;
2402: }
2403: if (*s == '\0') {
2404: *errstrp = "missing end quote";
2405: free(ret);
2406: return NULL;
2407: }
2408: ret[i] = '\0';
2409: s++;
2410: *sp = s;
2411: return ret;
2412: }
2413:
2414: int
2415: opt_match(const char **opts, const char *term)
2416: {
2417: if (strncasecmp((*opts), term, strlen(term)) == 0 &&
2418: (*opts)[strlen(term)] == '=') {
2419: *opts += strlen(term) + 1;
2420: return 1;
2421: }
2422: return 0;
1.161 markus 2423: }
2424:
2425: void
2426: opt_array_append2(const char *file, const int line, const char *directive,
2427: char ***array, int **iarray, u_int *lp, const char *s, int i)
2428: {
2429:
2430: if (*lp >= INT_MAX)
2431: fatal("%s line %d: Too many %s entries", file, line, directive);
2432:
2433: if (iarray != NULL) {
2434: *iarray = xrecallocarray(*iarray, *lp, *lp + 1,
2435: sizeof(**iarray));
2436: (*iarray)[*lp] = i;
2437: }
2438:
2439: *array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array));
2440: (*array)[*lp] = xstrdup(s);
2441: (*lp)++;
2442: }
2443:
2444: void
2445: opt_array_append(const char *file, const int line, const char *directive,
2446: char ***array, u_int *lp, const char *s)
2447: {
2448: opt_array_append2(file, line, directive, array, NULL, lp, s, 0);
1.142 djm 2449: }
2450:
1.144 dtucker 2451: sshsig_t
2452: ssh_signal(int signum, sshsig_t handler)
2453: {
2454: struct sigaction sa, osa;
2455:
2456: /* mask all other signals while in handler */
1.147 dtucker 2457: memset(&sa, 0, sizeof(sa));
1.144 dtucker 2458: sa.sa_handler = handler;
2459: sigfillset(&sa.sa_mask);
2460: if (signum != SIGALRM)
2461: sa.sa_flags = SA_RESTART;
2462: if (sigaction(signum, &sa, &osa) == -1) {
2463: debug3("sigaction(%s): %s", strsignal(signum), strerror(errno));
2464: return SIG_ERR;
2465: }
2466: return osa.sa_handler;
1.154 djm 2467: }
2468:
2469: int
2470: stdfd_devnull(int do_stdin, int do_stdout, int do_stderr)
2471: {
2472: int devnull, ret = 0;
2473:
2474: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.155 djm 2475: error_f("open %s: %s", _PATH_DEVNULL,
1.154 djm 2476: strerror(errno));
2477: return -1;
2478: }
2479: if ((do_stdin && dup2(devnull, STDIN_FILENO) == -1) ||
2480: (do_stdout && dup2(devnull, STDOUT_FILENO) == -1) ||
2481: (do_stderr && dup2(devnull, STDERR_FILENO) == -1)) {
1.155 djm 2482: error_f("dup2: %s", strerror(errno));
1.154 djm 2483: ret = -1;
2484: }
2485: if (devnull > STDERR_FILENO)
2486: close(devnull);
2487: return ret;
1.157 djm 2488: }
2489:
2490: /*
2491: * Runs command in a subprocess with a minimal environment.
2492: * Returns pid on success, 0 on failure.
2493: * The child stdout and stderr maybe captured, left attached or sent to
2494: * /dev/null depending on the contents of flags.
2495: * "tag" is prepended to log messages.
2496: * NB. "command" is only used for logging; the actual command executed is
2497: * av[0].
2498: */
2499: pid_t
2500: subprocess(const char *tag, const char *command,
2501: int ac, char **av, FILE **child, u_int flags,
2502: struct passwd *pw, privdrop_fn *drop_privs, privrestore_fn *restore_privs)
2503: {
2504: FILE *f = NULL;
2505: struct stat st;
2506: int fd, devnull, p[2], i;
2507: pid_t pid;
2508: char *cp, errmsg[512];
2509: u_int nenv = 0;
2510: char **env = NULL;
2511:
2512: /* If dropping privs, then must specify user and restore function */
2513: if (drop_privs != NULL && (pw == NULL || restore_privs == NULL)) {
2514: error("%s: inconsistent arguments", tag); /* XXX fatal? */
2515: return 0;
2516: }
2517: if (pw == NULL && (pw = getpwuid(getuid())) == NULL) {
2518: error("%s: no user for current uid", tag);
2519: return 0;
2520: }
2521: if (child != NULL)
2522: *child = NULL;
2523:
2524: debug3_f("%s command \"%s\" running as %s (flags 0x%x)",
2525: tag, command, pw->pw_name, flags);
2526:
2527: /* Check consistency */
2528: if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 &&
2529: (flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0) {
2530: error_f("inconsistent flags");
2531: return 0;
2532: }
2533: if (((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0) != (child == NULL)) {
2534: error_f("inconsistent flags/output");
2535: return 0;
2536: }
2537:
2538: /*
2539: * If executing an explicit binary, then verify the it exists
2540: * and appears safe-ish to execute
2541: */
2542: if (!path_absolute(av[0])) {
2543: error("%s path is not absolute", tag);
2544: return 0;
2545: }
2546: if (drop_privs != NULL)
2547: drop_privs(pw);
2548: if (stat(av[0], &st) == -1) {
2549: error("Could not stat %s \"%s\": %s", tag,
2550: av[0], strerror(errno));
2551: goto restore_return;
2552: }
2553: if ((flags & SSH_SUBPROCESS_UNSAFE_PATH) == 0 &&
2554: safe_path(av[0], &st, NULL, 0, errmsg, sizeof(errmsg)) != 0) {
2555: error("Unsafe %s \"%s\": %s", tag, av[0], errmsg);
2556: goto restore_return;
2557: }
2558: /* Prepare to keep the child's stdout if requested */
2559: if (pipe(p) == -1) {
2560: error("%s: pipe: %s", tag, strerror(errno));
2561: restore_return:
2562: if (restore_privs != NULL)
2563: restore_privs();
2564: return 0;
2565: }
2566: if (restore_privs != NULL)
2567: restore_privs();
2568:
2569: switch ((pid = fork())) {
2570: case -1: /* error */
2571: error("%s: fork: %s", tag, strerror(errno));
2572: close(p[0]);
2573: close(p[1]);
2574: return 0;
2575: case 0: /* child */
2576: /* Prepare a minimal environment for the child. */
2577: if ((flags & SSH_SUBPROCESS_PRESERVE_ENV) == 0) {
2578: nenv = 5;
2579: env = xcalloc(sizeof(*env), nenv);
2580: child_set_env(&env, &nenv, "PATH", _PATH_STDPATH);
2581: child_set_env(&env, &nenv, "USER", pw->pw_name);
2582: child_set_env(&env, &nenv, "LOGNAME", pw->pw_name);
2583: child_set_env(&env, &nenv, "HOME", pw->pw_dir);
2584: if ((cp = getenv("LANG")) != NULL)
2585: child_set_env(&env, &nenv, "LANG", cp);
2586: }
2587:
1.162 dtucker 2588: for (i = 1; i < NSIG; i++)
1.157 djm 2589: ssh_signal(i, SIG_DFL);
2590:
2591: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
2592: error("%s: open %s: %s", tag, _PATH_DEVNULL,
2593: strerror(errno));
2594: _exit(1);
2595: }
2596: if (dup2(devnull, STDIN_FILENO) == -1) {
2597: error("%s: dup2: %s", tag, strerror(errno));
2598: _exit(1);
2599: }
2600:
2601: /* Set up stdout as requested; leave stderr in place for now. */
2602: fd = -1;
2603: if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0)
2604: fd = p[1];
2605: else if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0)
2606: fd = devnull;
2607: if (fd != -1 && dup2(fd, STDOUT_FILENO) == -1) {
2608: error("%s: dup2: %s", tag, strerror(errno));
2609: _exit(1);
2610: }
2611: closefrom(STDERR_FILENO + 1);
2612:
1.170 djm 2613: if (geteuid() == 0 &&
2614: initgroups(pw->pw_name, pw->pw_gid) == -1) {
2615: error("%s: initgroups(%s, %u): %s", tag,
2616: pw->pw_name, (u_int)pw->pw_gid, strerror(errno));
2617: _exit(1);
2618: }
1.157 djm 2619: if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1) {
2620: error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid,
2621: strerror(errno));
2622: _exit(1);
2623: }
2624: if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1) {
2625: error("%s: setresuid %u: %s", tag, (u_int)pw->pw_uid,
2626: strerror(errno));
2627: _exit(1);
2628: }
2629: /* stdin is pointed to /dev/null at this point */
2630: if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 &&
2631: dup2(STDIN_FILENO, STDERR_FILENO) == -1) {
2632: error("%s: dup2: %s", tag, strerror(errno));
2633: _exit(1);
2634: }
2635: if (env != NULL)
2636: execve(av[0], av, env);
2637: else
2638: execv(av[0], av);
2639: error("%s %s \"%s\": %s", tag, env == NULL ? "execv" : "execve",
2640: command, strerror(errno));
2641: _exit(127);
2642: default: /* parent */
2643: break;
2644: }
2645:
2646: close(p[1]);
2647: if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0)
2648: close(p[0]);
2649: else if ((f = fdopen(p[0], "r")) == NULL) {
2650: error("%s: fdopen: %s", tag, strerror(errno));
2651: close(p[0]);
2652: /* Don't leave zombie child */
2653: kill(pid, SIGTERM);
2654: while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
2655: ;
2656: return 0;
2657: }
2658: /* Success */
2659: debug3_f("%s pid %ld", tag, (long)pid);
2660: if (child != NULL)
2661: *child = f;
2662: return pid;
1.165 djm 2663: }
2664:
2665: const char *
2666: lookup_env_in_list(const char *env, char * const *envs, size_t nenvs)
2667: {
2668: size_t i, envlen;
2669:
2670: envlen = strlen(env);
2671: for (i = 0; i < nenvs; i++) {
2672: if (strncmp(envs[i], env, envlen) == 0 &&
2673: envs[i][envlen] == '=') {
2674: return envs[i] + envlen + 1;
2675: }
2676: }
2677: return NULL;
1.144 dtucker 2678: }