Annotation of src/usr.bin/ssh/misc.c, Revision 1.125
1.125 ! djm 1: /* $OpenBSD: misc.c,v 1.124 2018/03/02 03:02:11 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>
1.43 stevesk 39:
1.92 djm 40: #include <ctype.h>
1.58 stevesk 41: #include <errno.h>
1.55 stevesk 42: #include <fcntl.h>
1.66 dtucker 43: #include <netdb.h>
1.43 stevesk 44: #include <paths.h>
1.54 stevesk 45: #include <pwd.h>
1.112 djm 46: #include <libgen.h>
1.96 deraadt 47: #include <limits.h>
1.112 djm 48: #include <signal.h>
1.57 stevesk 49: #include <stdarg.h>
1.63 stevesk 50: #include <stdio.h>
1.62 stevesk 51: #include <stdlib.h>
1.60 stevesk 52: #include <string.h>
1.59 stevesk 53: #include <unistd.h>
1.1 markus 54:
1.64 deraadt 55: #include "xmalloc.h"
1.1 markus 56: #include "misc.h"
57: #include "log.h"
1.56 dtucker 58: #include "ssh.h"
1.112 djm 59: #include "sshbuf.h"
60: #include "ssherr.h"
61: #include "uidswap.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 */
1.1 markus 217: char *
218: strdelim(char **s)
219: {
1.124 djm 220: char *old, *cp;
1.1 markus 221: int wspace = 0;
222:
223: if (*s == NULL)
224: return NULL;
225:
226: old = *s;
227:
1.46 dtucker 228: *s = strpbrk(*s, WHITESPACE QUOTE "=");
1.1 markus 229: if (*s == NULL)
230: return (old);
231:
1.46 dtucker 232: if (*s[0] == '\"') {
233: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
1.124 djm 234:
1.46 dtucker 235: /* Find matching quote */
1.124 djm 236: for (cp = *s; ; cp++) {
237: if (*cp == '\0')
238: return NULL; /* no matching quote */
239: if (*cp == '\\') {
240: /* Escape sequence */
241: if (cp[1] == '\"' || cp[1] == '\'' ||
242: cp[1] == '\\') {
243: memmove(cp, cp + 1, strlen(cp));
244: continue;
245: }
246: return NULL; /* invalid escape */
247: } else if (*cp == '\"') {
248: *(cp++) = '\0';
249: *s += strspn(cp, WHITESPACE);
250: return old;
251: }
1.46 dtucker 252: }
253: }
254:
1.1 markus 255: /* Allow only one '=' to be skipped */
256: if (*s[0] == '=')
257: wspace = 1;
258: *s[0] = '\0';
259:
1.46 dtucker 260: /* Skip any extra whitespace after first token */
1.1 markus 261: *s += strspn(*s + 1, WHITESPACE) + 1;
262: if (*s[0] == '=' && !wspace)
263: *s += strspn(*s + 1, WHITESPACE) + 1;
264:
265: return (old);
1.2 markus 266: }
267:
268: struct passwd *
269: pwcopy(struct passwd *pw)
270: {
1.49 djm 271: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 272:
1.2 markus 273: copy->pw_name = xstrdup(pw->pw_name);
274: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 275: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 276: copy->pw_uid = pw->pw_uid;
277: copy->pw_gid = pw->pw_gid;
1.11 markus 278: copy->pw_expire = pw->pw_expire;
279: copy->pw_change = pw->pw_change;
1.2 markus 280: copy->pw_class = xstrdup(pw->pw_class);
281: copy->pw_dir = xstrdup(pw->pw_dir);
282: copy->pw_shell = xstrdup(pw->pw_shell);
283: return copy;
1.5 stevesk 284: }
285:
1.12 markus 286: /*
287: * Convert ASCII string to TCP/IP port number.
1.70 djm 288: * Port must be >=0 and <=65535.
289: * Return -1 if invalid.
1.12 markus 290: */
291: int
292: a2port(const char *s)
1.5 stevesk 293: {
1.70 djm 294: long long port;
295: const char *errstr;
1.5 stevesk 296:
1.70 djm 297: port = strtonum(s, 0, 65535, &errstr);
298: if (errstr != NULL)
299: return -1;
300: return (int)port;
1.9 stevesk 301: }
302:
1.36 reyk 303: int
304: a2tun(const char *s, int *remote)
305: {
306: const char *errstr = NULL;
307: char *sp, *ep;
308: int tun;
309:
310: if (remote != NULL) {
1.37 reyk 311: *remote = SSH_TUNID_ANY;
1.36 reyk 312: sp = xstrdup(s);
313: if ((ep = strchr(sp, ':')) == NULL) {
1.89 djm 314: free(sp);
1.36 reyk 315: return (a2tun(s, NULL));
316: }
317: ep[0] = '\0'; ep++;
318: *remote = a2tun(ep, NULL);
319: tun = a2tun(sp, NULL);
1.89 djm 320: free(sp);
1.37 reyk 321: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 322: }
323:
324: if (strcasecmp(s, "any") == 0)
1.37 reyk 325: return (SSH_TUNID_ANY);
1.36 reyk 326:
1.37 reyk 327: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
328: if (errstr != NULL)
329: return (SSH_TUNID_ERR);
1.36 reyk 330:
331: return (tun);
332: }
333:
1.9 stevesk 334: #define SECONDS 1
335: #define MINUTES (SECONDS * 60)
336: #define HOURS (MINUTES * 60)
337: #define DAYS (HOURS * 24)
338: #define WEEKS (DAYS * 7)
339:
1.12 markus 340: /*
341: * Convert a time string into seconds; format is
342: * a sequence of:
343: * time[qualifier]
344: *
345: * Valid time qualifiers are:
346: * <none> seconds
347: * s|S seconds
348: * m|M minutes
349: * h|H hours
350: * d|D days
351: * w|W weeks
352: *
353: * Examples:
354: * 90m 90 minutes
355: * 1h30m 90 minutes
356: * 2d 2 days
357: * 1w 1 week
358: *
359: * Return -1 if time string is invalid.
360: */
361: long
362: convtime(const char *s)
1.9 stevesk 363: {
1.108 dtucker 364: long total, secs, multiplier = 1;
1.9 stevesk 365: const char *p;
366: char *endp;
367:
368: errno = 0;
369: total = 0;
370: p = s;
371:
372: if (p == NULL || *p == '\0')
373: return -1;
374:
375: while (*p) {
376: secs = strtol(p, &endp, 10);
377: if (p == endp ||
378: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
379: secs < 0)
380: return -1;
381:
382: switch (*endp++) {
383: case '\0':
384: endp--;
1.48 deraadt 385: break;
1.9 stevesk 386: case 's':
387: case 'S':
388: break;
389: case 'm':
390: case 'M':
1.108 dtucker 391: multiplier = MINUTES;
1.9 stevesk 392: break;
393: case 'h':
394: case 'H':
1.108 dtucker 395: multiplier = HOURS;
1.9 stevesk 396: break;
397: case 'd':
398: case 'D':
1.108 dtucker 399: multiplier = DAYS;
1.9 stevesk 400: break;
401: case 'w':
402: case 'W':
1.108 dtucker 403: multiplier = WEEKS;
1.9 stevesk 404: break;
405: default:
406: return -1;
407: }
1.109 dtucker 408: if (secs >= LONG_MAX / multiplier)
1.108 dtucker 409: return -1;
410: secs *= multiplier;
1.109 dtucker 411: if (total >= LONG_MAX - secs)
1.108 dtucker 412: return -1;
1.9 stevesk 413: total += secs;
414: if (total < 0)
415: return -1;
416: p = endp;
417: }
418:
419: return total;
1.56 dtucker 420: }
421:
422: /*
423: * Returns a standardized host+port identifier string.
424: * Caller must free returned string.
425: */
426: char *
427: put_host_port(const char *host, u_short port)
428: {
429: char *hoststr;
430:
431: if (port == 0 || port == SSH_DEFAULT_PORT)
432: return(xstrdup(host));
433: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
434: fatal("put_host_port: asprintf: %s", strerror(errno));
435: debug3("put_host_port: %s", hoststr);
436: return hoststr;
1.28 djm 437: }
438:
439: /*
440: * Search for next delimiter between hostnames/addresses and ports.
441: * Argument may be modified (for termination).
442: * Returns *cp if parsing succeeds.
1.114 millert 443: * *cp is set to the start of the next field, if one was found.
444: * The delimiter char, if present, is stored in delim.
1.28 djm 445: * If this is the last field, *cp is set to NULL.
446: */
1.114 millert 447: static char *
448: hpdelim2(char **cp, char *delim)
1.28 djm 449: {
450: char *s, *old;
451:
452: if (cp == NULL || *cp == NULL)
453: return NULL;
454:
455: old = s = *cp;
456: if (*s == '[') {
457: if ((s = strchr(s, ']')) == NULL)
458: return NULL;
459: else
460: s++;
461: } else if ((s = strpbrk(s, ":/")) == NULL)
462: s = *cp + strlen(*cp); /* skip to end (see first case below) */
463:
464: switch (*s) {
465: case '\0':
466: *cp = NULL; /* no more fields*/
467: break;
1.29 deraadt 468:
1.28 djm 469: case ':':
470: case '/':
1.114 millert 471: if (delim != NULL)
472: *delim = *s;
1.28 djm 473: *s = '\0'; /* terminate */
474: *cp = s + 1;
475: break;
1.29 deraadt 476:
1.28 djm 477: default:
478: return NULL;
479: }
480:
481: return old;
1.6 mouring 482: }
483:
484: char *
1.114 millert 485: hpdelim(char **cp)
486: {
487: return hpdelim2(cp, NULL);
488: }
489:
490: char *
1.6 mouring 491: cleanhostname(char *host)
492: {
493: if (*host == '[' && host[strlen(host) - 1] == ']') {
494: host[strlen(host) - 1] = '\0';
495: return (host + 1);
496: } else
497: return host;
498: }
499:
500: char *
501: colon(char *cp)
502: {
503: int flag = 0;
504:
505: if (*cp == ':') /* Leading colon is part of file name. */
1.76 djm 506: return NULL;
1.6 mouring 507: if (*cp == '[')
508: flag = 1;
509:
510: for (; *cp; ++cp) {
511: if (*cp == '@' && *(cp+1) == '[')
512: flag = 1;
513: if (*cp == ']' && *(cp+1) == ':' && flag)
514: return (cp+1);
515: if (*cp == ':' && !flag)
516: return (cp);
517: if (*cp == '/')
1.76 djm 518: return NULL;
1.6 mouring 519: }
1.76 djm 520: return NULL;
1.105 djm 521: }
522:
523: /*
1.114 millert 524: * Parse a [user@]host:[path] string.
525: * Caller must free returned user, host and path.
526: * Any of the pointer return arguments may be NULL (useful for syntax checking).
527: * If user was not specified then *userp will be set to NULL.
528: * If host was not specified then *hostp will be set to NULL.
529: * If path was not specified then *pathp will be set to ".".
530: * Returns 0 on success, -1 on failure.
531: */
532: int
533: parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
534: {
535: char *user = NULL, *host = NULL, *path = NULL;
536: char *sdup, *tmp;
537: int ret = -1;
538:
539: if (userp != NULL)
540: *userp = NULL;
541: if (hostp != NULL)
542: *hostp = NULL;
543: if (pathp != NULL)
544: *pathp = NULL;
545:
1.116 millert 546: sdup = xstrdup(s);
1.114 millert 547:
548: /* Check for remote syntax: [user@]host:[path] */
549: if ((tmp = colon(sdup)) == NULL)
550: goto out;
551:
552: /* Extract optional path */
553: *tmp++ = '\0';
554: if (*tmp == '\0')
555: tmp = ".";
556: path = xstrdup(tmp);
557:
558: /* Extract optional user and mandatory host */
559: tmp = strrchr(sdup, '@');
560: if (tmp != NULL) {
561: *tmp++ = '\0';
562: host = xstrdup(cleanhostname(tmp));
563: if (*sdup != '\0')
564: user = xstrdup(sdup);
565: } else {
566: host = xstrdup(cleanhostname(sdup));
567: user = NULL;
568: }
569:
570: /* Success */
571: if (userp != NULL) {
572: *userp = user;
573: user = NULL;
574: }
575: if (hostp != NULL) {
576: *hostp = host;
577: host = NULL;
1.116 millert 578: }
1.114 millert 579: if (pathp != NULL) {
580: *pathp = path;
581: path = NULL;
1.116 millert 582: }
1.114 millert 583: ret = 0;
584: out:
585: free(sdup);
586: free(user);
587: free(host);
588: free(path);
589: return ret;
590: }
591:
592: /*
1.105 djm 593: * Parse a [user@]host[:port] string.
594: * Caller must free returned user and host.
595: * Any of the pointer return arguments may be NULL (useful for syntax checking).
596: * If user was not specified then *userp will be set to NULL.
597: * If port was not specified then *portp will be -1.
598: * Returns 0 on success, -1 on failure.
599: */
600: int
601: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
602: {
603: char *sdup, *cp, *tmp;
604: char *user = NULL, *host = NULL;
605: int port = -1, ret = -1;
606:
607: if (userp != NULL)
608: *userp = NULL;
609: if (hostp != NULL)
610: *hostp = NULL;
611: if (portp != NULL)
612: *portp = -1;
613:
614: if ((sdup = tmp = strdup(s)) == NULL)
615: return -1;
616: /* Extract optional username */
1.114 millert 617: if ((cp = strrchr(tmp, '@')) != NULL) {
1.105 djm 618: *cp = '\0';
619: if (*tmp == '\0')
620: goto out;
621: if ((user = strdup(tmp)) == NULL)
622: goto out;
623: tmp = cp + 1;
624: }
625: /* Extract mandatory hostname */
626: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
627: goto out;
628: host = xstrdup(cleanhostname(cp));
629: /* Convert and verify optional port */
630: if (tmp != NULL && *tmp != '\0') {
631: if ((port = a2port(tmp)) <= 0)
632: goto out;
633: }
634: /* Success */
635: if (userp != NULL) {
636: *userp = user;
637: user = NULL;
638: }
639: if (hostp != NULL) {
640: *hostp = host;
641: host = NULL;
642: }
643: if (portp != NULL)
644: *portp = port;
645: ret = 0;
646: out:
647: free(sdup);
648: free(user);
649: free(host);
650: return ret;
1.7 mouring 651: }
652:
1.114 millert 653: /*
654: * Converts a two-byte hex string to decimal.
655: * Returns the decimal value or -1 for invalid input.
656: */
657: static int
658: hexchar(const char *s)
659: {
660: unsigned char result[2];
661: int i;
662:
663: for (i = 0; i < 2; i++) {
664: if (s[i] >= '0' && s[i] <= '9')
665: result[i] = (unsigned char)(s[i] - '0');
666: else if (s[i] >= 'a' && s[i] <= 'f')
667: result[i] = (unsigned char)(s[i] - 'a') + 10;
668: else if (s[i] >= 'A' && s[i] <= 'F')
669: result[i] = (unsigned char)(s[i] - 'A') + 10;
670: else
671: return -1;
672: }
673: return (result[0] << 4) | result[1];
674: }
675:
676: /*
677: * Decode an url-encoded string.
678: * Returns a newly allocated string on success or NULL on failure.
679: */
680: static char *
681: urldecode(const char *src)
682: {
683: char *ret, *dst;
684: int ch;
685:
686: ret = xmalloc(strlen(src) + 1);
687: for (dst = ret; *src != '\0'; src++) {
688: switch (*src) {
689: case '+':
690: *dst++ = ' ';
691: break;
692: case '%':
693: if (!isxdigit((unsigned char)src[1]) ||
694: !isxdigit((unsigned char)src[2]) ||
695: (ch = hexchar(src + 1)) == -1) {
696: free(ret);
697: return NULL;
698: }
699: *dst++ = ch;
700: src += 2;
701: break;
702: default:
703: *dst++ = *src;
704: break;
705: }
706: }
707: *dst = '\0';
708:
709: return ret;
710: }
711:
712: /*
713: * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
714: * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
715: * Either user or path may be url-encoded (but not host or port).
716: * Caller must free returned user, host and path.
717: * Any of the pointer return arguments may be NULL (useful for syntax checking)
718: * but the scheme must always be specified.
719: * If user was not specified then *userp will be set to NULL.
720: * If port was not specified then *portp will be -1.
721: * If path was not specified then *pathp will be set to NULL.
722: * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
723: */
724: int
725: parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
726: int *portp, char **pathp)
727: {
728: char *uridup, *cp, *tmp, ch;
729: char *user = NULL, *host = NULL, *path = NULL;
730: int port = -1, ret = -1;
731: size_t len;
732:
733: len = strlen(scheme);
734: if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
735: return 1;
736: uri += len + 3;
737:
738: if (userp != NULL)
739: *userp = NULL;
740: if (hostp != NULL)
741: *hostp = NULL;
742: if (portp != NULL)
743: *portp = -1;
744: if (pathp != NULL)
745: *pathp = NULL;
746:
747: uridup = tmp = xstrdup(uri);
748:
749: /* Extract optional ssh-info (username + connection params) */
750: if ((cp = strchr(tmp, '@')) != NULL) {
751: char *delim;
752:
753: *cp = '\0';
754: /* Extract username and connection params */
755: if ((delim = strchr(tmp, ';')) != NULL) {
756: /* Just ignore connection params for now */
757: *delim = '\0';
758: }
759: if (*tmp == '\0') {
760: /* Empty username */
761: goto out;
762: }
763: if ((user = urldecode(tmp)) == NULL)
764: goto out;
765: tmp = cp + 1;
766: }
767:
768: /* Extract mandatory hostname */
769: if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
770: goto out;
771: host = xstrdup(cleanhostname(cp));
772: if (!valid_domain(host, 0, NULL))
773: goto out;
774:
775: if (tmp != NULL && *tmp != '\0') {
776: if (ch == ':') {
777: /* Convert and verify port. */
778: if ((cp = strchr(tmp, '/')) != NULL)
779: *cp = '\0';
780: if ((port = a2port(tmp)) <= 0)
781: goto out;
782: tmp = cp ? cp + 1 : NULL;
783: }
784: if (tmp != NULL && *tmp != '\0') {
785: /* Extract optional path */
786: if ((path = urldecode(tmp)) == NULL)
787: goto out;
788: }
789: }
790:
791: /* Success */
792: if (userp != NULL) {
793: *userp = user;
794: user = NULL;
795: }
796: if (hostp != NULL) {
797: *hostp = host;
798: host = NULL;
799: }
800: if (portp != NULL)
801: *portp = port;
802: if (pathp != NULL) {
803: *pathp = path;
804: path = NULL;
805: }
806: ret = 0;
807: out:
808: free(uridup);
809: free(user);
810: free(host);
811: free(path);
812: return ret;
813: }
814:
1.12 markus 815: /* function to assist building execv() arguments */
1.7 mouring 816: void
817: addargs(arglist *args, char *fmt, ...)
818: {
819: va_list ap;
1.42 djm 820: char *cp;
1.25 avsm 821: u_int nalloc;
1.42 djm 822: int r;
1.7 mouring 823:
824: va_start(ap, fmt);
1.42 djm 825: r = vasprintf(&cp, fmt, ap);
1.7 mouring 826: va_end(ap);
1.42 djm 827: if (r == -1)
828: fatal("addargs: argument too long");
1.7 mouring 829:
1.22 markus 830: nalloc = args->nalloc;
1.7 mouring 831: if (args->list == NULL) {
1.22 markus 832: nalloc = 32;
1.7 mouring 833: args->num = 0;
1.22 markus 834: } else if (args->num+2 >= nalloc)
835: nalloc *= 2;
1.7 mouring 836:
1.110 deraadt 837: args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *));
1.22 markus 838: args->nalloc = nalloc;
1.42 djm 839: args->list[args->num++] = cp;
1.7 mouring 840: args->list[args->num] = NULL;
1.42 djm 841: }
842:
843: void
844: replacearg(arglist *args, u_int which, char *fmt, ...)
845: {
846: va_list ap;
847: char *cp;
848: int r;
849:
850: va_start(ap, fmt);
851: r = vasprintf(&cp, fmt, ap);
852: va_end(ap);
853: if (r == -1)
854: fatal("replacearg: argument too long");
855:
856: if (which >= args->num)
857: fatal("replacearg: tried to replace invalid arg %d >= %d",
858: which, args->num);
1.89 djm 859: free(args->list[which]);
1.42 djm 860: args->list[which] = cp;
861: }
862:
863: void
864: freeargs(arglist *args)
865: {
866: u_int i;
867:
868: if (args->list != NULL) {
869: for (i = 0; i < args->num; i++)
1.89 djm 870: free(args->list[i]);
871: free(args->list);
1.42 djm 872: args->nalloc = args->num = 0;
873: args->list = NULL;
874: }
1.30 djm 875: }
876:
877: /*
878: * Expands tildes in the file name. Returns data allocated by xmalloc.
879: * Warning: this calls getpw*.
880: */
881: char *
882: tilde_expand_filename(const char *filename, uid_t uid)
883: {
1.87 tedu 884: const char *path, *sep;
885: char user[128], *ret;
1.30 djm 886: struct passwd *pw;
1.32 djm 887: u_int len, slash;
1.30 djm 888:
889: if (*filename != '~')
890: return (xstrdup(filename));
891: filename++;
892:
893: path = strchr(filename, '/');
894: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 895: slash = path - filename;
896: if (slash > sizeof(user) - 1)
1.30 djm 897: fatal("tilde_expand_filename: ~username too long");
1.32 djm 898: memcpy(user, filename, slash);
899: user[slash] = '\0';
1.30 djm 900: if ((pw = getpwnam(user)) == NULL)
901: fatal("tilde_expand_filename: No such user %s", user);
902: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
1.69 dtucker 903: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
1.30 djm 904:
905: /* Make sure directory has a trailing '/' */
906: len = strlen(pw->pw_dir);
1.88 tedu 907: if (len == 0 || pw->pw_dir[len - 1] != '/')
1.87 tedu 908: sep = "/";
909: else
910: sep = "";
1.30 djm 911:
912: /* Skip leading '/' from specified path */
913: if (path != NULL)
914: filename = path + 1;
1.87 tedu 915:
1.96 deraadt 916: if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX)
1.30 djm 917: fatal("tilde_expand_filename: Path too long");
918:
1.87 tedu 919: return (ret);
1.31 djm 920: }
921:
922: /*
923: * Expand a string with a set of %[char] escapes. A number of escapes may be
924: * specified as (char *escape_chars, char *replacement) pairs. The list must
1.34 dtucker 925: * be terminated by a NULL escape_char. Returns replaced string in memory
1.31 djm 926: * allocated by xmalloc.
927: */
928: char *
929: percent_expand(const char *string, ...)
930: {
931: #define EXPAND_MAX_KEYS 16
1.73 djm 932: u_int num_keys, i, j;
1.31 djm 933: struct {
934: const char *key;
935: const char *repl;
936: } keys[EXPAND_MAX_KEYS];
937: char buf[4096];
938: va_list ap;
939:
940: /* Gather keys */
941: va_start(ap, string);
942: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
943: keys[num_keys].key = va_arg(ap, char *);
944: if (keys[num_keys].key == NULL)
945: break;
946: keys[num_keys].repl = va_arg(ap, char *);
947: if (keys[num_keys].repl == NULL)
1.73 djm 948: fatal("%s: NULL replacement", __func__);
1.31 djm 949: }
1.73 djm 950: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
951: fatal("%s: too many keys", __func__);
1.31 djm 952: va_end(ap);
953:
954: /* Expand string */
955: *buf = '\0';
956: for (i = 0; *string != '\0'; string++) {
957: if (*string != '%') {
958: append:
959: buf[i++] = *string;
960: if (i >= sizeof(buf))
1.73 djm 961: fatal("%s: string too long", __func__);
1.31 djm 962: buf[i] = '\0';
963: continue;
964: }
965: string++;
1.73 djm 966: /* %% case */
1.31 djm 967: if (*string == '%')
968: goto append;
1.100 tobias 969: if (*string == '\0')
970: fatal("%s: invalid format", __func__);
1.31 djm 971: for (j = 0; j < num_keys; j++) {
972: if (strchr(keys[j].key, *string) != NULL) {
973: i = strlcat(buf, keys[j].repl, sizeof(buf));
974: if (i >= sizeof(buf))
1.73 djm 975: fatal("%s: string too long", __func__);
1.31 djm 976: break;
977: }
978: }
979: if (j >= num_keys)
1.73 djm 980: fatal("%s: unknown key %%%c", __func__, *string);
1.31 djm 981: }
982: return (xstrdup(buf));
983: #undef EXPAND_MAX_KEYS
1.26 dtucker 984: }
985:
986: /*
987: * Read an entire line from a public key file into a static buffer, discarding
988: * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
989: */
990: int
991: read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
1.27 dtucker 992: u_long *lineno)
1.26 dtucker 993: {
994: while (fgets(buf, bufsz, f) != NULL) {
1.65 ray 995: if (buf[0] == '\0')
996: continue;
1.26 dtucker 997: (*lineno)++;
998: if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
999: return 0;
1000: } else {
1.27 dtucker 1001: debug("%s: %s line %lu exceeds size limit", __func__,
1002: filename, *lineno);
1.26 dtucker 1003: /* discard remainder of line */
1.29 deraadt 1004: while (fgetc(f) != '\n' && !feof(f))
1.26 dtucker 1005: ; /* nothing */
1006: }
1007: }
1008: return -1;
1.36 reyk 1009: }
1010:
1011: int
1.115 djm 1012: tun_open(int tun, int mode, char **ifname)
1.36 reyk 1013: {
1.37 reyk 1014: struct ifreq ifr;
1.36 reyk 1015: char name[100];
1.37 reyk 1016: int fd = -1, sock;
1.99 sthen 1017: const char *tunbase = "tun";
1018:
1.115 djm 1019: if (ifname != NULL)
1020: *ifname = NULL;
1021:
1.99 sthen 1022: if (mode == SSH_TUNMODE_ETHERNET)
1023: tunbase = "tap";
1.36 reyk 1024:
1.37 reyk 1025: /* Open the tunnel device */
1026: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 1027: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 1028: fd = open(name, O_RDWR);
1029: } else if (tun == SSH_TUNID_ANY) {
1030: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 1031: snprintf(name, sizeof(name), "/dev/%s%d",
1032: tunbase, tun);
1.37 reyk 1033: if ((fd = open(name, O_RDWR)) >= 0)
1034: break;
1.36 reyk 1035: }
1036: } else {
1.39 stevesk 1037: debug("%s: invalid tunnel %u", __func__, tun);
1.98 djm 1038: return -1;
1.37 reyk 1039: }
1040:
1041: if (fd < 0) {
1.98 djm 1042: debug("%s: %s open: %s", __func__, name, strerror(errno));
1043: return -1;
1.36 reyk 1044: }
1.37 reyk 1045:
1046: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
1047:
1.99 sthen 1048: /* Bring interface up if it is not already */
1049: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
1050: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 1051: goto failed;
1052:
1.98 djm 1053: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
1054: debug("%s: get interface %s flags: %s", __func__,
1055: ifr.ifr_name, strerror(errno));
1.37 reyk 1056: goto failed;
1.98 djm 1057: }
1.40 reyk 1058:
1.98 djm 1059: if (!(ifr.ifr_flags & IFF_UP)) {
1060: ifr.ifr_flags |= IFF_UP;
1061: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
1062: debug("%s: activate interface %s: %s", __func__,
1063: ifr.ifr_name, strerror(errno));
1064: goto failed;
1065: }
1066: }
1.115 djm 1067:
1068: if (ifname != NULL)
1069: *ifname = xstrdup(ifr.ifr_name);
1.37 reyk 1070:
1071: close(sock);
1.98 djm 1072: return fd;
1.37 reyk 1073:
1074: failed:
1075: if (fd >= 0)
1076: close(fd);
1077: if (sock >= 0)
1078: close(sock);
1.98 djm 1079: return -1;
1.35 djm 1080: }
1081:
1082: void
1083: sanitise_stdfd(void)
1084: {
1.41 djm 1085: int nullfd, dupfd;
1.35 djm 1086:
1.41 djm 1087: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 1088: fprintf(stderr, "Couldn't open /dev/null: %s\n",
1089: strerror(errno));
1.35 djm 1090: exit(1);
1091: }
1.103 krw 1092: while (++dupfd <= STDERR_FILENO) {
1093: /* Only populate closed fds. */
1094: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
1095: if (dup2(nullfd, dupfd) == -1) {
1096: fprintf(stderr, "dup2: %s\n", strerror(errno));
1097: exit(1);
1098: }
1.35 djm 1099: }
1100: }
1.103 krw 1101: if (nullfd > STDERR_FILENO)
1.35 djm 1102: close(nullfd);
1.1 markus 1103: }
1.33 djm 1104:
1105: char *
1.52 djm 1106: tohex(const void *vp, size_t l)
1.33 djm 1107: {
1.52 djm 1108: const u_char *p = (const u_char *)vp;
1.33 djm 1109: char b[3], *r;
1.52 djm 1110: size_t i, hl;
1111:
1112: if (l > 65536)
1113: return xstrdup("tohex: length > 65536");
1.33 djm 1114:
1115: hl = l * 2 + 1;
1.49 djm 1116: r = xcalloc(1, hl);
1.33 djm 1117: for (i = 0; i < l; i++) {
1.52 djm 1118: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 1119: strlcat(r, b, hl);
1120: }
1121: return (r);
1122: }
1123:
1.52 djm 1124: u_int64_t
1125: get_u64(const void *vp)
1126: {
1127: const u_char *p = (const u_char *)vp;
1128: u_int64_t v;
1129:
1130: v = (u_int64_t)p[0] << 56;
1131: v |= (u_int64_t)p[1] << 48;
1132: v |= (u_int64_t)p[2] << 40;
1133: v |= (u_int64_t)p[3] << 32;
1134: v |= (u_int64_t)p[4] << 24;
1135: v |= (u_int64_t)p[5] << 16;
1136: v |= (u_int64_t)p[6] << 8;
1137: v |= (u_int64_t)p[7];
1138:
1139: return (v);
1140: }
1141:
1142: u_int32_t
1143: get_u32(const void *vp)
1144: {
1145: const u_char *p = (const u_char *)vp;
1146: u_int32_t v;
1147:
1148: v = (u_int32_t)p[0] << 24;
1149: v |= (u_int32_t)p[1] << 16;
1150: v |= (u_int32_t)p[2] << 8;
1151: v |= (u_int32_t)p[3];
1152:
1153: return (v);
1154: }
1155:
1.93 djm 1156: u_int32_t
1157: get_u32_le(const void *vp)
1158: {
1159: const u_char *p = (const u_char *)vp;
1160: u_int32_t v;
1161:
1162: v = (u_int32_t)p[0];
1163: v |= (u_int32_t)p[1] << 8;
1164: v |= (u_int32_t)p[2] << 16;
1165: v |= (u_int32_t)p[3] << 24;
1166:
1167: return (v);
1168: }
1169:
1.52 djm 1170: u_int16_t
1171: get_u16(const void *vp)
1172: {
1173: const u_char *p = (const u_char *)vp;
1174: u_int16_t v;
1175:
1176: v = (u_int16_t)p[0] << 8;
1177: v |= (u_int16_t)p[1];
1178:
1179: return (v);
1180: }
1181:
1182: void
1183: put_u64(void *vp, u_int64_t v)
1184: {
1185: u_char *p = (u_char *)vp;
1186:
1187: p[0] = (u_char)(v >> 56) & 0xff;
1188: p[1] = (u_char)(v >> 48) & 0xff;
1189: p[2] = (u_char)(v >> 40) & 0xff;
1190: p[3] = (u_char)(v >> 32) & 0xff;
1191: p[4] = (u_char)(v >> 24) & 0xff;
1192: p[5] = (u_char)(v >> 16) & 0xff;
1193: p[6] = (u_char)(v >> 8) & 0xff;
1194: p[7] = (u_char)v & 0xff;
1195: }
1196:
1197: void
1198: put_u32(void *vp, u_int32_t v)
1199: {
1200: u_char *p = (u_char *)vp;
1201:
1202: p[0] = (u_char)(v >> 24) & 0xff;
1203: p[1] = (u_char)(v >> 16) & 0xff;
1204: p[2] = (u_char)(v >> 8) & 0xff;
1205: p[3] = (u_char)v & 0xff;
1206: }
1207:
1.93 djm 1208: void
1209: put_u32_le(void *vp, u_int32_t v)
1210: {
1211: u_char *p = (u_char *)vp;
1212:
1213: p[0] = (u_char)v & 0xff;
1214: p[1] = (u_char)(v >> 8) & 0xff;
1215: p[2] = (u_char)(v >> 16) & 0xff;
1216: p[3] = (u_char)(v >> 24) & 0xff;
1217: }
1.52 djm 1218:
1219: void
1220: put_u16(void *vp, u_int16_t v)
1221: {
1222: u_char *p = (u_char *)vp;
1223:
1224: p[0] = (u_char)(v >> 8) & 0xff;
1225: p[1] = (u_char)v & 0xff;
1226: }
1.68 dtucker 1227:
1228: void
1229: ms_subtract_diff(struct timeval *start, int *ms)
1230: {
1231: struct timeval diff, finish;
1232:
1.119 dtucker 1233: monotime_tv(&finish);
1234: timersub(&finish, start, &diff);
1.68 dtucker 1235: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
1236: }
1237:
1238: void
1239: ms_to_timeval(struct timeval *tv, int ms)
1240: {
1241: if (ms < 0)
1242: ms = 0;
1243: tv->tv_sec = ms / 1000;
1244: tv->tv_usec = (ms % 1000) * 1000;
1.90 dtucker 1245: }
1246:
1.119 dtucker 1247: void
1248: monotime_ts(struct timespec *ts)
1249: {
1250: if (clock_gettime(CLOCK_MONOTONIC, ts) != 0)
1251: fatal("clock_gettime: %s", strerror(errno));
1252: }
1253:
1254: void
1255: monotime_tv(struct timeval *tv)
1256: {
1257: struct timespec ts;
1258:
1259: monotime_ts(&ts);
1260: tv->tv_sec = ts.tv_sec;
1261: tv->tv_usec = ts.tv_nsec / 1000;
1262: }
1263:
1.90 dtucker 1264: time_t
1265: monotime(void)
1266: {
1267: struct timespec ts;
1268:
1.119 dtucker 1269: monotime_ts(&ts);
1.90 dtucker 1270: return (ts.tv_sec);
1.102 dtucker 1271: }
1272:
1273: double
1274: monotime_double(void)
1275: {
1276: struct timespec ts;
1277:
1.119 dtucker 1278: monotime_ts(&ts);
1279: return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
1.81 djm 1280: }
1281:
1282: void
1283: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
1284: {
1285: bw->buflen = buflen;
1286: bw->rate = kbps;
1287: bw->thresh = bw->rate;
1288: bw->lamt = 0;
1289: timerclear(&bw->bwstart);
1290: timerclear(&bw->bwend);
1291: }
1292:
1293: /* Callback from read/write loop to insert bandwidth-limiting delays */
1294: void
1295: bandwidth_limit(struct bwlimit *bw, size_t read_len)
1296: {
1297: u_int64_t waitlen;
1298: struct timespec ts, rm;
1299:
1300: if (!timerisset(&bw->bwstart)) {
1.119 dtucker 1301: monotime_tv(&bw->bwstart);
1.81 djm 1302: return;
1303: }
1304:
1305: bw->lamt += read_len;
1306: if (bw->lamt < bw->thresh)
1307: return;
1308:
1.119 dtucker 1309: monotime_tv(&bw->bwend);
1.81 djm 1310: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
1311: if (!timerisset(&bw->bwend))
1312: return;
1313:
1314: bw->lamt *= 8;
1315: waitlen = (double)1000000L * bw->lamt / bw->rate;
1316:
1317: bw->bwstart.tv_sec = waitlen / 1000000L;
1318: bw->bwstart.tv_usec = waitlen % 1000000L;
1319:
1320: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
1321: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
1322:
1323: /* Adjust the wait time */
1324: if (bw->bwend.tv_sec) {
1325: bw->thresh /= 2;
1326: if (bw->thresh < bw->buflen / 4)
1327: bw->thresh = bw->buflen / 4;
1328: } else if (bw->bwend.tv_usec < 10000) {
1329: bw->thresh *= 2;
1330: if (bw->thresh > bw->buflen * 8)
1331: bw->thresh = bw->buflen * 8;
1332: }
1333:
1334: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1335: while (nanosleep(&ts, &rm) == -1) {
1336: if (errno != EINTR)
1337: break;
1338: ts = rm;
1339: }
1340: }
1341:
1342: bw->lamt = 0;
1.119 dtucker 1343: monotime_tv(&bw->bwstart);
1.84 djm 1344: }
1345:
1346: /* Make a template filename for mk[sd]temp() */
1347: void
1348: mktemp_proto(char *s, size_t len)
1349: {
1350: const char *tmpdir;
1351: int r;
1352:
1353: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1354: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1355: if (r > 0 && (size_t)r < len)
1356: return;
1357: }
1358: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1359: if (r < 0 || (size_t)r >= len)
1360: fatal("%s: template string too short", __func__);
1.68 dtucker 1361: }
1.83 djm 1362:
1363: static const struct {
1364: const char *name;
1365: int value;
1366: } ipqos[] = {
1.111 djm 1367: { "none", INT_MAX }, /* can't use 0 here; that's CS0 */
1.83 djm 1368: { "af11", IPTOS_DSCP_AF11 },
1369: { "af12", IPTOS_DSCP_AF12 },
1370: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 1371: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 1372: { "af22", IPTOS_DSCP_AF22 },
1373: { "af23", IPTOS_DSCP_AF23 },
1374: { "af31", IPTOS_DSCP_AF31 },
1375: { "af32", IPTOS_DSCP_AF32 },
1376: { "af33", IPTOS_DSCP_AF33 },
1377: { "af41", IPTOS_DSCP_AF41 },
1378: { "af42", IPTOS_DSCP_AF42 },
1379: { "af43", IPTOS_DSCP_AF43 },
1380: { "cs0", IPTOS_DSCP_CS0 },
1381: { "cs1", IPTOS_DSCP_CS1 },
1382: { "cs2", IPTOS_DSCP_CS2 },
1383: { "cs3", IPTOS_DSCP_CS3 },
1384: { "cs4", IPTOS_DSCP_CS4 },
1385: { "cs5", IPTOS_DSCP_CS5 },
1386: { "cs6", IPTOS_DSCP_CS6 },
1387: { "cs7", IPTOS_DSCP_CS7 },
1388: { "ef", IPTOS_DSCP_EF },
1389: { "lowdelay", IPTOS_LOWDELAY },
1390: { "throughput", IPTOS_THROUGHPUT },
1391: { "reliability", IPTOS_RELIABILITY },
1392: { NULL, -1 }
1393: };
1394:
1395: int
1396: parse_ipqos(const char *cp)
1397: {
1398: u_int i;
1399: char *ep;
1400: long val;
1401:
1402: if (cp == NULL)
1403: return -1;
1404: for (i = 0; ipqos[i].name != NULL; i++) {
1405: if (strcasecmp(cp, ipqos[i].name) == 0)
1406: return ipqos[i].value;
1407: }
1408: /* Try parsing as an integer */
1409: val = strtol(cp, &ep, 0);
1410: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1411: return -1;
1412: return val;
1413: }
1414:
1.85 stevesk 1415: const char *
1416: iptos2str(int iptos)
1417: {
1418: int i;
1419: static char iptos_str[sizeof "0xff"];
1420:
1421: for (i = 0; ipqos[i].name != NULL; i++) {
1422: if (ipqos[i].value == iptos)
1423: return ipqos[i].name;
1424: }
1425: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1426: return iptos_str;
1.92 djm 1427: }
1428:
1429: void
1430: lowercase(char *s)
1431: {
1432: for (; *s; s++)
1433: *s = tolower((u_char)*s);
1.94 millert 1434: }
1435:
1436: int
1437: unix_listener(const char *path, int backlog, int unlink_first)
1438: {
1439: struct sockaddr_un sunaddr;
1440: int saved_errno, sock;
1441:
1442: memset(&sunaddr, 0, sizeof(sunaddr));
1443: sunaddr.sun_family = AF_UNIX;
1.121 djm 1444: if (strlcpy(sunaddr.sun_path, path,
1445: sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1446: error("%s: path \"%s\" too long for Unix domain socket",
1447: __func__, path);
1.94 millert 1448: errno = ENAMETOOLONG;
1449: return -1;
1450: }
1451:
1452: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1453: if (sock < 0) {
1454: saved_errno = errno;
1.121 djm 1455: error("%s: socket: %.100s", __func__, strerror(errno));
1.94 millert 1456: errno = saved_errno;
1457: return -1;
1458: }
1459: if (unlink_first == 1) {
1460: if (unlink(path) != 0 && errno != ENOENT)
1461: error("unlink(%s): %.100s", path, strerror(errno));
1462: }
1463: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1464: saved_errno = errno;
1.121 djm 1465: error("%s: cannot bind to path %s: %s",
1466: __func__, path, strerror(errno));
1.122 djm 1467: close(sock);
1.94 millert 1468: errno = saved_errno;
1469: return -1;
1470: }
1471: if (listen(sock, backlog) < 0) {
1472: saved_errno = errno;
1.122 djm 1473: error("%s: cannot listen on path %s: %s",
1474: __func__, path, strerror(errno));
1.94 millert 1475: close(sock);
1476: unlink(path);
1477: errno = saved_errno;
1478: return -1;
1479: }
1480: return sock;
1.85 stevesk 1481: }
1.104 djm 1482:
1483: /*
1484: * Compares two strings that maybe be NULL. Returns non-zero if strings
1485: * are both NULL or are identical, returns zero otherwise.
1486: */
1487: static int
1488: strcmp_maybe_null(const char *a, const char *b)
1489: {
1490: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1491: return 0;
1492: if (a != NULL && strcmp(a, b) != 0)
1493: return 0;
1494: return 1;
1495: }
1496:
1497: /*
1498: * Compare two forwards, returning non-zero if they are identical or
1499: * zero otherwise.
1500: */
1501: int
1502: forward_equals(const struct Forward *a, const struct Forward *b)
1503: {
1504: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1505: return 0;
1506: if (a->listen_port != b->listen_port)
1507: return 0;
1508: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1509: return 0;
1510: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1511: return 0;
1512: if (a->connect_port != b->connect_port)
1513: return 0;
1514: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1515: return 0;
1516: /* allocated_port and handle are not checked */
1517: return 1;
1518: }
1519:
1.106 dtucker 1520: /* returns 1 if bind to specified port by specified user is permitted */
1521: int
1522: bind_permitted(int port, uid_t uid)
1523: {
1524: if (port < IPPORT_RESERVED && uid != 0)
1525: return 0;
1.107 dtucker 1526: return 1;
1527: }
1528:
1529: /* returns 1 if process is already daemonized, 0 otherwise */
1530: int
1531: daemonized(void)
1532: {
1533: int fd;
1534:
1535: if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1536: close(fd);
1537: return 0; /* have controlling terminal */
1538: }
1539: if (getppid() != 1)
1540: return 0; /* parent is not init */
1541: if (getsid(0) != getpid())
1542: return 0; /* not session leader */
1543: debug3("already daemonized");
1.106 dtucker 1544: return 1;
1545: }
1.112 djm 1546:
1547:
1548: /*
1549: * Splits 's' into an argument vector. Handles quoted string and basic
1550: * escape characters (\\, \", \'). Caller must free the argument vector
1551: * and its members.
1552: */
1553: int
1554: argv_split(const char *s, int *argcp, char ***argvp)
1555: {
1556: int r = SSH_ERR_INTERNAL_ERROR;
1557: int argc = 0, quote, i, j;
1558: char *arg, **argv = xcalloc(1, sizeof(*argv));
1559:
1560: *argvp = NULL;
1561: *argcp = 0;
1562:
1563: for (i = 0; s[i] != '\0'; i++) {
1564: /* Skip leading whitespace */
1565: if (s[i] == ' ' || s[i] == '\t')
1566: continue;
1567:
1568: /* Start of a token */
1569: quote = 0;
1570: if (s[i] == '\\' &&
1571: (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\'))
1572: i++;
1573: else if (s[i] == '\'' || s[i] == '"')
1574: quote = s[i++];
1575:
1576: argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
1577: arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
1578: argv[argc] = NULL;
1579:
1580: /* Copy the token in, removing escapes */
1581: for (j = 0; s[i] != '\0'; i++) {
1582: if (s[i] == '\\') {
1583: if (s[i + 1] == '\'' ||
1584: s[i + 1] == '\"' ||
1585: s[i + 1] == '\\') {
1586: i++; /* Skip '\' */
1587: arg[j++] = s[i];
1588: } else {
1589: /* Unrecognised escape */
1590: arg[j++] = s[i];
1591: }
1592: } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
1593: break; /* done */
1594: else if (quote != 0 && s[i] == quote)
1595: break; /* done */
1596: else
1597: arg[j++] = s[i];
1598: }
1599: if (s[i] == '\0') {
1600: if (quote != 0) {
1601: /* Ran out of string looking for close quote */
1602: r = SSH_ERR_INVALID_FORMAT;
1603: goto out;
1604: }
1605: break;
1606: }
1607: }
1608: /* Success */
1609: *argcp = argc;
1610: *argvp = argv;
1611: argc = 0;
1612: argv = NULL;
1613: r = 0;
1614: out:
1615: if (argc != 0 && argv != NULL) {
1616: for (i = 0; i < argc; i++)
1617: free(argv[i]);
1618: free(argv);
1619: }
1620: return r;
1621: }
1622:
1623: /*
1624: * Reassemble an argument vector into a string, quoting and escaping as
1625: * necessary. Caller must free returned string.
1626: */
1627: char *
1628: argv_assemble(int argc, char **argv)
1629: {
1630: int i, j, ws, r;
1631: char c, *ret;
1632: struct sshbuf *buf, *arg;
1633:
1634: if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
1635: fatal("%s: sshbuf_new failed", __func__);
1636:
1637: for (i = 0; i < argc; i++) {
1638: ws = 0;
1639: sshbuf_reset(arg);
1640: for (j = 0; argv[i][j] != '\0'; j++) {
1641: r = 0;
1642: c = argv[i][j];
1643: switch (c) {
1644: case ' ':
1645: case '\t':
1646: ws = 1;
1647: r = sshbuf_put_u8(arg, c);
1648: break;
1649: case '\\':
1650: case '\'':
1651: case '"':
1652: if ((r = sshbuf_put_u8(arg, '\\')) != 0)
1653: break;
1654: /* FALLTHROUGH */
1655: default:
1656: r = sshbuf_put_u8(arg, c);
1657: break;
1658: }
1659: if (r != 0)
1660: fatal("%s: sshbuf_put_u8: %s",
1661: __func__, ssh_err(r));
1662: }
1663: if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
1664: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
1665: (r = sshbuf_putb(buf, arg)) != 0 ||
1666: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
1667: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1668: }
1669: if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
1670: fatal("%s: malloc failed", __func__);
1671: memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
1672: ret[sshbuf_len(buf)] = '\0';
1673: sshbuf_free(buf);
1674: sshbuf_free(arg);
1675: return ret;
1676: }
1677:
1678: /* Returns 0 if pid exited cleanly, non-zero otherwise */
1679: int
1.113 djm 1680: exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
1.112 djm 1681: {
1682: int status;
1683:
1684: while (waitpid(pid, &status, 0) == -1) {
1685: if (errno != EINTR) {
1686: error("%s: waitpid: %s", tag, strerror(errno));
1687: return -1;
1688: }
1689: }
1690: if (WIFSIGNALED(status)) {
1691: error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
1692: return -1;
1693: } else if (WEXITSTATUS(status) != 0) {
1.113 djm 1694: do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
1695: "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
1.112 djm 1696: return -1;
1697: }
1698: return 0;
1699: }
1700:
1701: /*
1702: * Check a given path for security. This is defined as all components
1703: * of the path to the file must be owned by either the owner of
1704: * of the file or root and no directories must be group or world writable.
1705: *
1706: * XXX Should any specific check be done for sym links ?
1707: *
1708: * Takes a file name, its stat information (preferably from fstat() to
1709: * avoid races), the uid of the expected owner, their home directory and an
1710: * error buffer plus max size as arguments.
1711: *
1712: * Returns 0 on success and -1 on failure
1713: */
1714: int
1715: safe_path(const char *name, struct stat *stp, const char *pw_dir,
1716: uid_t uid, char *err, size_t errlen)
1717: {
1718: char buf[PATH_MAX], homedir[PATH_MAX];
1719: char *cp;
1720: int comparehome = 0;
1721: struct stat st;
1722:
1723: if (realpath(name, buf) == NULL) {
1724: snprintf(err, errlen, "realpath %s failed: %s", name,
1725: strerror(errno));
1726: return -1;
1727: }
1728: if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
1729: comparehome = 1;
1730:
1731: if (!S_ISREG(stp->st_mode)) {
1732: snprintf(err, errlen, "%s is not a regular file", buf);
1733: return -1;
1734: }
1735: if ((stp->st_uid != 0 && stp->st_uid != uid) ||
1736: (stp->st_mode & 022) != 0) {
1737: snprintf(err, errlen, "bad ownership or modes for file %s",
1738: buf);
1739: return -1;
1740: }
1741:
1742: /* for each component of the canonical path, walking upwards */
1743: for (;;) {
1744: if ((cp = dirname(buf)) == NULL) {
1745: snprintf(err, errlen, "dirname() failed");
1746: return -1;
1747: }
1748: strlcpy(buf, cp, sizeof(buf));
1749:
1750: if (stat(buf, &st) < 0 ||
1751: (st.st_uid != 0 && st.st_uid != uid) ||
1752: (st.st_mode & 022) != 0) {
1753: snprintf(err, errlen,
1754: "bad ownership or modes for directory %s", buf);
1755: return -1;
1756: }
1757:
1758: /* If are past the homedir then we can stop */
1759: if (comparehome && strcmp(homedir, buf) == 0)
1760: break;
1761:
1762: /*
1763: * dirname should always complete with a "/" path,
1764: * but we can be paranoid and check for "." too
1765: */
1766: if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
1767: break;
1768: }
1769: return 0;
1770: }
1771:
1772: /*
1773: * Version of safe_path() that accepts an open file descriptor to
1774: * avoid races.
1775: *
1776: * Returns 0 on success and -1 on failure
1777: */
1778: int
1779: safe_path_fd(int fd, const char *file, struct passwd *pw,
1780: char *err, size_t errlen)
1781: {
1782: struct stat st;
1783:
1784: /* check the open file to avoid races */
1785: if (fstat(fd, &st) < 0) {
1786: snprintf(err, errlen, "cannot stat file %s: %s",
1787: file, strerror(errno));
1788: return -1;
1789: }
1790: return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
1791: }
1792:
1793: /*
1794: * Sets the value of the given variable in the environment. If the variable
1795: * already exists, its value is overridden.
1796: */
1797: void
1798: child_set_env(char ***envp, u_int *envsizep, const char *name,
1799: const char *value)
1800: {
1801: char **env;
1802: u_int envsize;
1803: u_int i, namelen;
1804:
1805: if (strchr(name, '=') != NULL) {
1806: error("Invalid environment variable \"%.100s\"", name);
1807: return;
1808: }
1809:
1810: /*
1811: * Find the slot where the value should be stored. If the variable
1812: * already exists, we reuse the slot; otherwise we append a new slot
1813: * at the end of the array, expanding if necessary.
1814: */
1815: env = *envp;
1816: namelen = strlen(name);
1817: for (i = 0; env[i]; i++)
1818: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
1819: break;
1820: if (env[i]) {
1821: /* Reuse the slot. */
1822: free(env[i]);
1823: } else {
1824: /* New variable. Expand if necessary. */
1825: envsize = *envsizep;
1826: if (i >= envsize - 1) {
1827: if (envsize >= 1000)
1828: fatal("child_set_env: too many env vars");
1829: envsize += 50;
1830: env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
1831: *envsizep = envsize;
1832: }
1833: /* Need to set the NULL pointer at end of array beyond the new slot. */
1834: env[i + 1] = NULL;
1835: }
1836:
1837: /* Allocate space and format the variable in the appropriate slot. */
1.125 ! djm 1838: /* XXX xasprintf */
1.112 djm 1839: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
1840: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
1841: }
1842:
1.114 millert 1843: /*
1844: * Check and optionally lowercase a domain name, also removes trailing '.'
1845: * Returns 1 on success and 0 on failure, storing an error message in errstr.
1846: */
1847: int
1848: valid_domain(char *name, int makelower, const char **errstr)
1849: {
1850: size_t i, l = strlen(name);
1851: u_char c, last = '\0';
1852: static char errbuf[256];
1853:
1854: if (l == 0) {
1855: strlcpy(errbuf, "empty domain name", sizeof(errbuf));
1856: goto bad;
1857: }
1858: if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
1859: snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
1860: "starts with invalid character", name);
1861: goto bad;
1862: }
1863: for (i = 0; i < l; i++) {
1864: c = tolower((u_char)name[i]);
1865: if (makelower)
1866: name[i] = (char)c;
1867: if (last == '.' && c == '.') {
1868: snprintf(errbuf, sizeof(errbuf), "domain name "
1869: "\"%.100s\" contains consecutive separators", name);
1870: goto bad;
1871: }
1872: if (c != '.' && c != '-' && !isalnum(c) &&
1873: c != '_') /* technically invalid, but common */ {
1874: snprintf(errbuf, sizeof(errbuf), "domain name "
1875: "\"%.100s\" contains invalid characters", name);
1876: goto bad;
1877: }
1878: last = c;
1879: }
1880: if (name[l - 1] == '.')
1881: name[l - 1] = '\0';
1882: if (errstr != NULL)
1883: *errstr = NULL;
1884: return 1;
1885: bad:
1886: if (errstr != NULL)
1887: *errstr = errbuf;
1888: return 0;
1.120 dtucker 1889: }
1890:
1891: const char *
1892: atoi_err(const char *nptr, int *val)
1893: {
1894: const char *errstr = NULL;
1895: long long num;
1896:
1897: if (nptr == NULL || *nptr == '\0')
1898: return "missing";
1899: num = strtonum(nptr, 0, INT_MAX, &errstr);
1900: if (errstr == NULL)
1901: *val = (int)num;
1902: return errstr;
1.114 millert 1903: }
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