Annotation of src/usr.bin/ssh/misc.c, Revision 1.131
1.131 ! dtucker 1: /* $OpenBSD: misc.c,v 1.130 2018/07/18 11:34:04 dtucker Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.52 djm 4: * Copyright (c) 2005,2006 Damien Miller. All rights reserved.
1.1 markus 5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
1.64 deraadt 27: #include <sys/types.h>
1.45 stevesk 28: #include <sys/ioctl.h>
1.53 stevesk 29: #include <sys/socket.h>
1.112 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"
1.1 markus 61:
1.12 markus 62: /* remove newline at end of string */
1.1 markus 63: char *
64: chop(char *s)
65: {
66: char *t = s;
67: while (*t) {
1.13 deraadt 68: if (*t == '\n' || *t == '\r') {
1.1 markus 69: *t = '\0';
70: return s;
71: }
72: t++;
73: }
74: return s;
75:
76: }
77:
1.12 markus 78: /* set/unset filedescriptor to non-blocking */
1.24 djm 79: int
1.1 markus 80: set_nonblock(int fd)
81: {
82: int val;
1.8 markus 83:
1.103 krw 84: val = fcntl(fd, F_GETFL);
1.1 markus 85: if (val < 0) {
1.103 krw 86: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 87: return (-1);
1.1 markus 88: }
89: if (val & O_NONBLOCK) {
1.24 djm 90: debug3("fd %d is O_NONBLOCK", fd);
91: return (0);
1.1 markus 92: }
1.21 markus 93: debug2("fd %d setting O_NONBLOCK", fd);
1.1 markus 94: val |= O_NONBLOCK;
1.24 djm 95: if (fcntl(fd, F_SETFL, val) == -1) {
96: debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
97: strerror(errno));
98: return (-1);
99: }
100: return (0);
1.8 markus 101: }
102:
1.24 djm 103: int
1.8 markus 104: unset_nonblock(int fd)
105: {
106: int val;
107:
1.103 krw 108: val = fcntl(fd, F_GETFL);
1.8 markus 109: if (val < 0) {
1.103 krw 110: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 111: return (-1);
1.8 markus 112: }
113: if (!(val & O_NONBLOCK)) {
1.24 djm 114: debug3("fd %d is not O_NONBLOCK", fd);
115: return (0);
1.8 markus 116: }
1.10 markus 117: debug("fd %d clearing O_NONBLOCK", fd);
1.8 markus 118: val &= ~O_NONBLOCK;
1.24 djm 119: if (fcntl(fd, F_SETFL, val) == -1) {
120: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
1.18 markus 121: fd, strerror(errno));
1.24 djm 122: return (-1);
123: }
124: return (0);
1.66 dtucker 125: }
126:
127: const char *
128: ssh_gai_strerror(int gaierr)
129: {
1.91 djm 130: if (gaierr == EAI_SYSTEM && errno != 0)
1.67 dtucker 131: return strerror(errno);
132: return gai_strerror(gaierr);
1.15 stevesk 133: }
134:
135: /* disable nagle on socket */
136: void
137: set_nodelay(int fd)
138: {
1.17 stevesk 139: int opt;
140: socklen_t optlen;
1.15 stevesk 141:
1.16 stevesk 142: optlen = sizeof opt;
143: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
1.23 markus 144: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
1.16 stevesk 145: return;
146: }
147: if (opt == 1) {
148: debug2("fd %d is TCP_NODELAY", fd);
149: return;
150: }
151: opt = 1;
1.20 markus 152: debug2("fd %d setting TCP_NODELAY", fd);
1.16 stevesk 153: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
1.15 stevesk 154: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.117 djm 155: }
156:
157: /* Allow local port reuse in TIME_WAIT */
158: int
159: set_reuseaddr(int fd)
160: {
161: int on = 1;
162:
163: if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
164: error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
165: return -1;
166: }
167: return 0;
168: }
169:
1.118 djm 170: /* Get/set routing domain */
171: char *
172: get_rdomain(int fd)
173: {
174: int rtable;
175: char *ret;
176: socklen_t len = sizeof(rtable);
177:
178: if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) {
179: error("Failed to get routing domain for fd %d: %s",
180: fd, strerror(errno));
181: return NULL;
182: }
183: xasprintf(&ret, "%d", rtable);
184: return ret;
185: }
186:
1.117 djm 187: int
188: set_rdomain(int fd, const char *name)
189: {
190: int rtable;
191: const char *errstr;
192:
193: if (name == NULL)
194: return 0; /* default table */
195:
196: rtable = (int)strtonum(name, 0, 255, &errstr);
197: if (errstr != NULL) {
198: /* Shouldn't happen */
199: error("Invalid routing domain \"%s\": %s", name, errstr);
200: return -1;
201: }
202: if (setsockopt(fd, SOL_SOCKET, SO_RTABLE,
203: &rtable, sizeof(rtable)) == -1) {
204: error("Failed to set routing domain %d on fd %d: %s",
205: rtable, fd, strerror(errno));
206: return -1;
207: }
208: return 0;
1.72 reyk 209: }
210:
1.1 markus 211: /* Characters considered whitespace in strsep calls. */
212: #define WHITESPACE " \t\r\n"
1.46 dtucker 213: #define QUOTE "\""
1.1 markus 214:
1.12 markus 215: /* return next token in configuration line */
1.129 djm 216: static char *
217: strdelim_internal(char **s, int split_equals)
1.1 markus 218: {
1.126 djm 219: char *old;
1.1 markus 220: int wspace = 0;
221:
222: if (*s == NULL)
223: return NULL;
224:
225: old = *s;
226:
1.129 djm 227: *s = strpbrk(*s,
228: split_equals ? WHITESPACE QUOTE "=" : 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 */
234: /* Find matching quote */
1.126 djm 235: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
236: return (NULL); /* no matching quote */
237: } else {
238: *s[0] = '\0';
239: *s += strspn(*s + 1, WHITESPACE) + 1;
240: return (old);
1.46 dtucker 241: }
242: }
243:
1.1 markus 244: /* Allow only one '=' to be skipped */
1.129 djm 245: if (split_equals && *s[0] == '=')
1.1 markus 246: wspace = 1;
247: *s[0] = '\0';
248:
1.46 dtucker 249: /* Skip any extra whitespace after first token */
1.1 markus 250: *s += strspn(*s + 1, WHITESPACE) + 1;
1.129 djm 251: if (split_equals && *s[0] == '=' && !wspace)
1.1 markus 252: *s += strspn(*s + 1, WHITESPACE) + 1;
253:
254: return (old);
1.129 djm 255: }
256:
257: /*
258: * Return next token in configuration line; splts on whitespace or a
259: * single '=' character.
260: */
261: char *
262: strdelim(char **s)
263: {
264: return strdelim_internal(s, 1);
265: }
266:
267: /*
268: * Return next token in configuration line; splts on whitespace only.
269: */
270: char *
271: strdelimw(char **s)
272: {
273: return strdelim_internal(s, 0);
1.2 markus 274: }
275:
276: struct passwd *
277: pwcopy(struct passwd *pw)
278: {
1.49 djm 279: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 280:
1.2 markus 281: copy->pw_name = xstrdup(pw->pw_name);
282: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 283: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 284: copy->pw_uid = pw->pw_uid;
285: copy->pw_gid = pw->pw_gid;
1.11 markus 286: copy->pw_expire = pw->pw_expire;
287: copy->pw_change = pw->pw_change;
1.2 markus 288: copy->pw_class = xstrdup(pw->pw_class);
289: copy->pw_dir = xstrdup(pw->pw_dir);
290: copy->pw_shell = xstrdup(pw->pw_shell);
291: return copy;
1.5 stevesk 292: }
293:
1.12 markus 294: /*
295: * Convert ASCII string to TCP/IP port number.
1.70 djm 296: * Port must be >=0 and <=65535.
297: * Return -1 if invalid.
1.12 markus 298: */
299: int
300: a2port(const char *s)
1.5 stevesk 301: {
1.70 djm 302: long long port;
303: const char *errstr;
1.5 stevesk 304:
1.70 djm 305: port = strtonum(s, 0, 65535, &errstr);
306: if (errstr != NULL)
307: return -1;
308: return (int)port;
1.9 stevesk 309: }
310:
1.36 reyk 311: int
312: a2tun(const char *s, int *remote)
313: {
314: const char *errstr = NULL;
315: char *sp, *ep;
316: int tun;
317:
318: if (remote != NULL) {
1.37 reyk 319: *remote = SSH_TUNID_ANY;
1.36 reyk 320: sp = xstrdup(s);
321: if ((ep = strchr(sp, ':')) == NULL) {
1.89 djm 322: free(sp);
1.36 reyk 323: return (a2tun(s, NULL));
324: }
325: ep[0] = '\0'; ep++;
326: *remote = a2tun(ep, NULL);
327: tun = a2tun(sp, NULL);
1.89 djm 328: free(sp);
1.37 reyk 329: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 330: }
331:
332: if (strcasecmp(s, "any") == 0)
1.37 reyk 333: return (SSH_TUNID_ANY);
1.36 reyk 334:
1.37 reyk 335: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
336: if (errstr != NULL)
337: return (SSH_TUNID_ERR);
1.36 reyk 338:
339: return (tun);
340: }
341:
1.9 stevesk 342: #define SECONDS 1
343: #define MINUTES (SECONDS * 60)
344: #define HOURS (MINUTES * 60)
345: #define DAYS (HOURS * 24)
346: #define WEEKS (DAYS * 7)
347:
1.12 markus 348: /*
349: * Convert a time string into seconds; format is
350: * a sequence of:
351: * time[qualifier]
352: *
353: * Valid time qualifiers are:
354: * <none> seconds
355: * s|S seconds
356: * m|M minutes
357: * h|H hours
358: * d|D days
359: * w|W weeks
360: *
361: * Examples:
362: * 90m 90 minutes
363: * 1h30m 90 minutes
364: * 2d 2 days
365: * 1w 1 week
366: *
367: * Return -1 if time string is invalid.
368: */
369: long
370: convtime(const char *s)
1.9 stevesk 371: {
1.108 dtucker 372: long total, secs, multiplier = 1;
1.9 stevesk 373: const char *p;
374: char *endp;
375:
376: errno = 0;
377: total = 0;
378: p = s;
379:
380: if (p == NULL || *p == '\0')
381: return -1;
382:
383: while (*p) {
384: secs = strtol(p, &endp, 10);
385: if (p == endp ||
386: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
387: secs < 0)
388: return -1;
389:
390: switch (*endp++) {
391: case '\0':
392: endp--;
1.48 deraadt 393: break;
1.9 stevesk 394: case 's':
395: case 'S':
396: break;
397: case 'm':
398: case 'M':
1.108 dtucker 399: multiplier = MINUTES;
1.9 stevesk 400: break;
401: case 'h':
402: case 'H':
1.108 dtucker 403: multiplier = HOURS;
1.9 stevesk 404: break;
405: case 'd':
406: case 'D':
1.108 dtucker 407: multiplier = DAYS;
1.9 stevesk 408: break;
409: case 'w':
410: case 'W':
1.108 dtucker 411: multiplier = WEEKS;
1.9 stevesk 412: break;
413: default:
414: return -1;
415: }
1.109 dtucker 416: if (secs >= LONG_MAX / multiplier)
1.108 dtucker 417: return -1;
418: secs *= multiplier;
1.109 dtucker 419: if (total >= LONG_MAX - secs)
1.108 dtucker 420: return -1;
1.9 stevesk 421: total += secs;
422: if (total < 0)
423: return -1;
424: p = endp;
425: }
426:
427: return total;
1.56 dtucker 428: }
429:
430: /*
431: * Returns a standardized host+port identifier string.
432: * Caller must free returned string.
433: */
434: char *
435: put_host_port(const char *host, u_short port)
436: {
437: char *hoststr;
438:
439: if (port == 0 || port == SSH_DEFAULT_PORT)
440: return(xstrdup(host));
441: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
442: fatal("put_host_port: asprintf: %s", strerror(errno));
443: debug3("put_host_port: %s", hoststr);
444: return hoststr;
1.28 djm 445: }
446:
447: /*
448: * Search for next delimiter between hostnames/addresses and ports.
449: * Argument may be modified (for termination).
450: * Returns *cp if parsing succeeds.
1.114 millert 451: * *cp is set to the start of the next field, if one was found.
452: * The delimiter char, if present, is stored in delim.
1.28 djm 453: * If this is the last field, *cp is set to NULL.
454: */
1.114 millert 455: static char *
456: hpdelim2(char **cp, char *delim)
1.28 djm 457: {
458: char *s, *old;
459:
460: if (cp == NULL || *cp == NULL)
461: return NULL;
462:
463: old = s = *cp;
464: if (*s == '[') {
465: if ((s = strchr(s, ']')) == NULL)
466: return NULL;
467: else
468: s++;
469: } else if ((s = strpbrk(s, ":/")) == NULL)
470: s = *cp + strlen(*cp); /* skip to end (see first case below) */
471:
472: switch (*s) {
473: case '\0':
474: *cp = NULL; /* no more fields*/
475: break;
1.29 deraadt 476:
1.28 djm 477: case ':':
478: case '/':
1.114 millert 479: if (delim != NULL)
480: *delim = *s;
1.28 djm 481: *s = '\0'; /* terminate */
482: *cp = s + 1;
483: break;
1.29 deraadt 484:
1.28 djm 485: default:
486: return NULL;
487: }
488:
489: return old;
1.6 mouring 490: }
491:
492: char *
1.114 millert 493: hpdelim(char **cp)
494: {
495: return hpdelim2(cp, NULL);
496: }
497:
498: char *
1.6 mouring 499: cleanhostname(char *host)
500: {
501: if (*host == '[' && host[strlen(host) - 1] == ']') {
502: host[strlen(host) - 1] = '\0';
503: return (host + 1);
504: } else
505: return host;
506: }
507:
508: char *
509: colon(char *cp)
510: {
511: int flag = 0;
512:
513: if (*cp == ':') /* Leading colon is part of file name. */
1.76 djm 514: return NULL;
1.6 mouring 515: if (*cp == '[')
516: flag = 1;
517:
518: for (; *cp; ++cp) {
519: if (*cp == '@' && *(cp+1) == '[')
520: flag = 1;
521: if (*cp == ']' && *(cp+1) == ':' && flag)
522: return (cp+1);
523: if (*cp == ':' && !flag)
524: return (cp);
525: if (*cp == '/')
1.76 djm 526: return NULL;
1.6 mouring 527: }
1.76 djm 528: return NULL;
1.105 djm 529: }
530:
531: /*
1.114 millert 532: * Parse a [user@]host:[path] string.
533: * Caller must free returned user, host and path.
534: * Any of the pointer return arguments may be NULL (useful for syntax checking).
535: * If user was not specified then *userp will be set to NULL.
536: * If host was not specified then *hostp will be set to NULL.
537: * If path was not specified then *pathp will be set to ".".
538: * Returns 0 on success, -1 on failure.
539: */
540: int
541: parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
542: {
543: char *user = NULL, *host = NULL, *path = NULL;
544: char *sdup, *tmp;
545: int ret = -1;
546:
547: if (userp != NULL)
548: *userp = NULL;
549: if (hostp != NULL)
550: *hostp = NULL;
551: if (pathp != NULL)
552: *pathp = NULL;
553:
1.116 millert 554: sdup = xstrdup(s);
1.114 millert 555:
556: /* Check for remote syntax: [user@]host:[path] */
557: if ((tmp = colon(sdup)) == NULL)
558: goto out;
559:
560: /* Extract optional path */
561: *tmp++ = '\0';
562: if (*tmp == '\0')
563: tmp = ".";
564: path = xstrdup(tmp);
565:
566: /* Extract optional user and mandatory host */
567: tmp = strrchr(sdup, '@');
568: if (tmp != NULL) {
569: *tmp++ = '\0';
570: host = xstrdup(cleanhostname(tmp));
571: if (*sdup != '\0')
572: user = xstrdup(sdup);
573: } else {
574: host = xstrdup(cleanhostname(sdup));
575: user = NULL;
576: }
577:
578: /* Success */
579: if (userp != NULL) {
580: *userp = user;
581: user = NULL;
582: }
583: if (hostp != NULL) {
584: *hostp = host;
585: host = NULL;
1.116 millert 586: }
1.114 millert 587: if (pathp != NULL) {
588: *pathp = path;
589: path = NULL;
1.116 millert 590: }
1.114 millert 591: ret = 0;
592: out:
593: free(sdup);
594: free(user);
595: free(host);
596: free(path);
597: return ret;
598: }
599:
600: /*
1.105 djm 601: * Parse a [user@]host[:port] string.
602: * Caller must free returned user and host.
603: * Any of the pointer return arguments may be NULL (useful for syntax checking).
604: * If user was not specified then *userp will be set to NULL.
605: * If port was not specified then *portp will be -1.
606: * Returns 0 on success, -1 on failure.
607: */
608: int
609: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
610: {
611: char *sdup, *cp, *tmp;
612: char *user = NULL, *host = NULL;
613: int port = -1, ret = -1;
614:
615: if (userp != NULL)
616: *userp = NULL;
617: if (hostp != NULL)
618: *hostp = NULL;
619: if (portp != NULL)
620: *portp = -1;
621:
622: if ((sdup = tmp = strdup(s)) == NULL)
623: return -1;
624: /* Extract optional username */
1.114 millert 625: if ((cp = strrchr(tmp, '@')) != NULL) {
1.105 djm 626: *cp = '\0';
627: if (*tmp == '\0')
628: goto out;
629: if ((user = strdup(tmp)) == NULL)
630: goto out;
631: tmp = cp + 1;
632: }
633: /* Extract mandatory hostname */
634: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
635: goto out;
636: host = xstrdup(cleanhostname(cp));
637: /* Convert and verify optional port */
638: if (tmp != NULL && *tmp != '\0') {
639: if ((port = a2port(tmp)) <= 0)
640: goto out;
641: }
642: /* Success */
643: if (userp != NULL) {
644: *userp = user;
645: user = NULL;
646: }
647: if (hostp != NULL) {
648: *hostp = host;
649: host = NULL;
650: }
651: if (portp != NULL)
652: *portp = port;
653: ret = 0;
654: out:
655: free(sdup);
656: free(user);
657: free(host);
658: return ret;
1.7 mouring 659: }
660:
1.114 millert 661: /*
662: * Converts a two-byte hex string to decimal.
663: * Returns the decimal value or -1 for invalid input.
664: */
665: static int
666: hexchar(const char *s)
667: {
668: unsigned char result[2];
669: int i;
670:
671: for (i = 0; i < 2; i++) {
672: if (s[i] >= '0' && s[i] <= '9')
673: result[i] = (unsigned char)(s[i] - '0');
674: else if (s[i] >= 'a' && s[i] <= 'f')
675: result[i] = (unsigned char)(s[i] - 'a') + 10;
676: else if (s[i] >= 'A' && s[i] <= 'F')
677: result[i] = (unsigned char)(s[i] - 'A') + 10;
678: else
679: return -1;
680: }
681: return (result[0] << 4) | result[1];
682: }
683:
684: /*
685: * Decode an url-encoded string.
686: * Returns a newly allocated string on success or NULL on failure.
687: */
688: static char *
689: urldecode(const char *src)
690: {
691: char *ret, *dst;
692: int ch;
693:
694: ret = xmalloc(strlen(src) + 1);
695: for (dst = ret; *src != '\0'; src++) {
696: switch (*src) {
697: case '+':
698: *dst++ = ' ';
699: break;
700: case '%':
701: if (!isxdigit((unsigned char)src[1]) ||
702: !isxdigit((unsigned char)src[2]) ||
703: (ch = hexchar(src + 1)) == -1) {
704: free(ret);
705: return NULL;
706: }
707: *dst++ = ch;
708: src += 2;
709: break;
710: default:
711: *dst++ = *src;
712: break;
713: }
714: }
715: *dst = '\0';
716:
717: return ret;
718: }
719:
720: /*
721: * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
722: * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
723: * Either user or path may be url-encoded (but not host or port).
724: * Caller must free returned user, host and path.
725: * Any of the pointer return arguments may be NULL (useful for syntax checking)
726: * but the scheme must always be specified.
727: * If user was not specified then *userp will be set to NULL.
728: * If port was not specified then *portp will be -1.
729: * If path was not specified then *pathp will be set to NULL.
730: * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
731: */
732: int
733: parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
734: int *portp, char **pathp)
735: {
736: char *uridup, *cp, *tmp, ch;
737: char *user = NULL, *host = NULL, *path = NULL;
738: int port = -1, ret = -1;
739: size_t len;
740:
741: len = strlen(scheme);
742: if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
743: return 1;
744: uri += len + 3;
745:
746: if (userp != NULL)
747: *userp = NULL;
748: if (hostp != NULL)
749: *hostp = NULL;
750: if (portp != NULL)
751: *portp = -1;
752: if (pathp != NULL)
753: *pathp = NULL;
754:
755: uridup = tmp = xstrdup(uri);
756:
757: /* Extract optional ssh-info (username + connection params) */
758: if ((cp = strchr(tmp, '@')) != NULL) {
759: char *delim;
760:
761: *cp = '\0';
762: /* Extract username and connection params */
763: if ((delim = strchr(tmp, ';')) != NULL) {
764: /* Just ignore connection params for now */
765: *delim = '\0';
766: }
767: if (*tmp == '\0') {
768: /* Empty username */
769: goto out;
770: }
771: if ((user = urldecode(tmp)) == NULL)
772: goto out;
773: tmp = cp + 1;
774: }
775:
776: /* Extract mandatory hostname */
777: if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
778: goto out;
779: host = xstrdup(cleanhostname(cp));
780: if (!valid_domain(host, 0, NULL))
781: goto out;
782:
783: if (tmp != NULL && *tmp != '\0') {
784: if (ch == ':') {
785: /* Convert and verify port. */
786: if ((cp = strchr(tmp, '/')) != NULL)
787: *cp = '\0';
788: if ((port = a2port(tmp)) <= 0)
789: goto out;
790: tmp = cp ? cp + 1 : NULL;
791: }
792: if (tmp != NULL && *tmp != '\0') {
793: /* Extract optional path */
794: if ((path = urldecode(tmp)) == NULL)
795: goto out;
796: }
797: }
798:
799: /* Success */
800: if (userp != NULL) {
801: *userp = user;
802: user = NULL;
803: }
804: if (hostp != NULL) {
805: *hostp = host;
806: host = NULL;
807: }
808: if (portp != NULL)
809: *portp = port;
810: if (pathp != NULL) {
811: *pathp = path;
812: path = NULL;
813: }
814: ret = 0;
815: out:
816: free(uridup);
817: free(user);
818: free(host);
819: free(path);
820: return ret;
821: }
822:
1.12 markus 823: /* function to assist building execv() arguments */
1.7 mouring 824: void
825: addargs(arglist *args, char *fmt, ...)
826: {
827: va_list ap;
1.42 djm 828: char *cp;
1.25 avsm 829: u_int nalloc;
1.42 djm 830: int r;
1.7 mouring 831:
832: va_start(ap, fmt);
1.42 djm 833: r = vasprintf(&cp, fmt, ap);
1.7 mouring 834: va_end(ap);
1.42 djm 835: if (r == -1)
836: fatal("addargs: argument too long");
1.7 mouring 837:
1.22 markus 838: nalloc = args->nalloc;
1.7 mouring 839: if (args->list == NULL) {
1.22 markus 840: nalloc = 32;
1.7 mouring 841: args->num = 0;
1.22 markus 842: } else if (args->num+2 >= nalloc)
843: nalloc *= 2;
1.7 mouring 844:
1.110 deraadt 845: args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *));
1.22 markus 846: args->nalloc = nalloc;
1.42 djm 847: args->list[args->num++] = cp;
1.7 mouring 848: args->list[args->num] = NULL;
1.42 djm 849: }
850:
851: void
852: replacearg(arglist *args, u_int which, char *fmt, ...)
853: {
854: va_list ap;
855: char *cp;
856: int r;
857:
858: va_start(ap, fmt);
859: r = vasprintf(&cp, fmt, ap);
860: va_end(ap);
861: if (r == -1)
862: fatal("replacearg: argument too long");
863:
864: if (which >= args->num)
865: fatal("replacearg: tried to replace invalid arg %d >= %d",
866: which, args->num);
1.89 djm 867: free(args->list[which]);
1.42 djm 868: args->list[which] = cp;
869: }
870:
871: void
872: freeargs(arglist *args)
873: {
874: u_int i;
875:
876: if (args->list != NULL) {
877: for (i = 0; i < args->num; i++)
1.89 djm 878: free(args->list[i]);
879: free(args->list);
1.42 djm 880: args->nalloc = args->num = 0;
881: args->list = NULL;
882: }
1.30 djm 883: }
884:
885: /*
886: * Expands tildes in the file name. Returns data allocated by xmalloc.
887: * Warning: this calls getpw*.
888: */
889: char *
890: tilde_expand_filename(const char *filename, uid_t uid)
891: {
1.87 tedu 892: const char *path, *sep;
893: char user[128], *ret;
1.30 djm 894: struct passwd *pw;
1.32 djm 895: u_int len, slash;
1.30 djm 896:
897: if (*filename != '~')
898: return (xstrdup(filename));
899: filename++;
900:
901: path = strchr(filename, '/');
902: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 903: slash = path - filename;
904: if (slash > sizeof(user) - 1)
1.30 djm 905: fatal("tilde_expand_filename: ~username too long");
1.32 djm 906: memcpy(user, filename, slash);
907: user[slash] = '\0';
1.30 djm 908: if ((pw = getpwnam(user)) == NULL)
909: fatal("tilde_expand_filename: No such user %s", user);
910: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
1.69 dtucker 911: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
1.30 djm 912:
913: /* Make sure directory has a trailing '/' */
914: len = strlen(pw->pw_dir);
1.88 tedu 915: if (len == 0 || pw->pw_dir[len - 1] != '/')
1.87 tedu 916: sep = "/";
917: else
918: sep = "";
1.30 djm 919:
920: /* Skip leading '/' from specified path */
921: if (path != NULL)
922: filename = path + 1;
1.87 tedu 923:
1.96 deraadt 924: if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX)
1.30 djm 925: fatal("tilde_expand_filename: Path too long");
926:
1.87 tedu 927: return (ret);
1.31 djm 928: }
929:
930: /*
931: * Expand a string with a set of %[char] escapes. A number of escapes may be
932: * specified as (char *escape_chars, char *replacement) pairs. The list must
1.34 dtucker 933: * be terminated by a NULL escape_char. Returns replaced string in memory
1.31 djm 934: * allocated by xmalloc.
935: */
936: char *
937: percent_expand(const char *string, ...)
938: {
939: #define EXPAND_MAX_KEYS 16
1.73 djm 940: u_int num_keys, i, j;
1.31 djm 941: struct {
942: const char *key;
943: const char *repl;
944: } keys[EXPAND_MAX_KEYS];
945: char buf[4096];
946: va_list ap;
947:
948: /* Gather keys */
949: va_start(ap, string);
950: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
951: keys[num_keys].key = va_arg(ap, char *);
952: if (keys[num_keys].key == NULL)
953: break;
954: keys[num_keys].repl = va_arg(ap, char *);
955: if (keys[num_keys].repl == NULL)
1.73 djm 956: fatal("%s: NULL replacement", __func__);
1.31 djm 957: }
1.73 djm 958: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
959: fatal("%s: too many keys", __func__);
1.31 djm 960: va_end(ap);
961:
962: /* Expand string */
963: *buf = '\0';
964: for (i = 0; *string != '\0'; string++) {
965: if (*string != '%') {
966: append:
967: buf[i++] = *string;
968: if (i >= sizeof(buf))
1.73 djm 969: fatal("%s: string too long", __func__);
1.31 djm 970: buf[i] = '\0';
971: continue;
972: }
973: string++;
1.73 djm 974: /* %% case */
1.31 djm 975: if (*string == '%')
976: goto append;
1.100 tobias 977: if (*string == '\0')
978: fatal("%s: invalid format", __func__);
1.31 djm 979: for (j = 0; j < num_keys; j++) {
980: if (strchr(keys[j].key, *string) != NULL) {
981: i = strlcat(buf, keys[j].repl, sizeof(buf));
982: if (i >= sizeof(buf))
1.73 djm 983: fatal("%s: string too long", __func__);
1.31 djm 984: break;
985: }
986: }
987: if (j >= num_keys)
1.73 djm 988: fatal("%s: unknown key %%%c", __func__, *string);
1.31 djm 989: }
990: return (xstrdup(buf));
991: #undef EXPAND_MAX_KEYS
1.36 reyk 992: }
993:
994: int
1.115 djm 995: tun_open(int tun, int mode, char **ifname)
1.36 reyk 996: {
1.37 reyk 997: struct ifreq ifr;
1.36 reyk 998: char name[100];
1.37 reyk 999: int fd = -1, sock;
1.99 sthen 1000: const char *tunbase = "tun";
1001:
1.115 djm 1002: if (ifname != NULL)
1003: *ifname = NULL;
1004:
1.99 sthen 1005: if (mode == SSH_TUNMODE_ETHERNET)
1006: tunbase = "tap";
1.36 reyk 1007:
1.37 reyk 1008: /* Open the tunnel device */
1009: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 1010: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 1011: fd = open(name, O_RDWR);
1012: } else if (tun == SSH_TUNID_ANY) {
1013: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 1014: snprintf(name, sizeof(name), "/dev/%s%d",
1015: tunbase, tun);
1.37 reyk 1016: if ((fd = open(name, O_RDWR)) >= 0)
1017: break;
1.36 reyk 1018: }
1019: } else {
1.39 stevesk 1020: debug("%s: invalid tunnel %u", __func__, tun);
1.98 djm 1021: return -1;
1.37 reyk 1022: }
1023:
1024: if (fd < 0) {
1.98 djm 1025: debug("%s: %s open: %s", __func__, name, strerror(errno));
1026: return -1;
1.36 reyk 1027: }
1.37 reyk 1028:
1029: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
1030:
1.99 sthen 1031: /* Bring interface up if it is not already */
1032: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
1033: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 1034: goto failed;
1035:
1.98 djm 1036: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
1037: debug("%s: get interface %s flags: %s", __func__,
1038: ifr.ifr_name, strerror(errno));
1.37 reyk 1039: goto failed;
1.98 djm 1040: }
1.40 reyk 1041:
1.98 djm 1042: if (!(ifr.ifr_flags & IFF_UP)) {
1043: ifr.ifr_flags |= IFF_UP;
1044: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
1045: debug("%s: activate interface %s: %s", __func__,
1046: ifr.ifr_name, strerror(errno));
1047: goto failed;
1048: }
1049: }
1.115 djm 1050:
1051: if (ifname != NULL)
1052: *ifname = xstrdup(ifr.ifr_name);
1.37 reyk 1053:
1054: close(sock);
1.98 djm 1055: return fd;
1.37 reyk 1056:
1057: failed:
1058: if (fd >= 0)
1059: close(fd);
1060: if (sock >= 0)
1061: close(sock);
1.98 djm 1062: return -1;
1.35 djm 1063: }
1064:
1065: void
1066: sanitise_stdfd(void)
1067: {
1.41 djm 1068: int nullfd, dupfd;
1.35 djm 1069:
1.41 djm 1070: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 1071: fprintf(stderr, "Couldn't open /dev/null: %s\n",
1072: strerror(errno));
1.35 djm 1073: exit(1);
1074: }
1.103 krw 1075: while (++dupfd <= STDERR_FILENO) {
1076: /* Only populate closed fds. */
1077: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
1078: if (dup2(nullfd, dupfd) == -1) {
1079: fprintf(stderr, "dup2: %s\n", strerror(errno));
1080: exit(1);
1081: }
1.35 djm 1082: }
1083: }
1.103 krw 1084: if (nullfd > STDERR_FILENO)
1.35 djm 1085: close(nullfd);
1.1 markus 1086: }
1.33 djm 1087:
1088: char *
1.52 djm 1089: tohex(const void *vp, size_t l)
1.33 djm 1090: {
1.52 djm 1091: const u_char *p = (const u_char *)vp;
1.33 djm 1092: char b[3], *r;
1.52 djm 1093: size_t i, hl;
1094:
1095: if (l > 65536)
1096: return xstrdup("tohex: length > 65536");
1.33 djm 1097:
1098: hl = l * 2 + 1;
1.49 djm 1099: r = xcalloc(1, hl);
1.33 djm 1100: for (i = 0; i < l; i++) {
1.52 djm 1101: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 1102: strlcat(r, b, hl);
1103: }
1104: return (r);
1105: }
1106:
1.52 djm 1107: u_int64_t
1108: get_u64(const void *vp)
1109: {
1110: const u_char *p = (const u_char *)vp;
1111: u_int64_t v;
1112:
1113: v = (u_int64_t)p[0] << 56;
1114: v |= (u_int64_t)p[1] << 48;
1115: v |= (u_int64_t)p[2] << 40;
1116: v |= (u_int64_t)p[3] << 32;
1117: v |= (u_int64_t)p[4] << 24;
1118: v |= (u_int64_t)p[5] << 16;
1119: v |= (u_int64_t)p[6] << 8;
1120: v |= (u_int64_t)p[7];
1121:
1122: return (v);
1123: }
1124:
1125: u_int32_t
1126: get_u32(const void *vp)
1127: {
1128: const u_char *p = (const u_char *)vp;
1129: u_int32_t v;
1130:
1131: v = (u_int32_t)p[0] << 24;
1132: v |= (u_int32_t)p[1] << 16;
1133: v |= (u_int32_t)p[2] << 8;
1134: v |= (u_int32_t)p[3];
1135:
1136: return (v);
1137: }
1138:
1.93 djm 1139: u_int32_t
1140: get_u32_le(const void *vp)
1141: {
1142: const u_char *p = (const u_char *)vp;
1143: u_int32_t v;
1144:
1145: v = (u_int32_t)p[0];
1146: v |= (u_int32_t)p[1] << 8;
1147: v |= (u_int32_t)p[2] << 16;
1148: v |= (u_int32_t)p[3] << 24;
1149:
1150: return (v);
1151: }
1152:
1.52 djm 1153: u_int16_t
1154: get_u16(const void *vp)
1155: {
1156: const u_char *p = (const u_char *)vp;
1157: u_int16_t v;
1158:
1159: v = (u_int16_t)p[0] << 8;
1160: v |= (u_int16_t)p[1];
1161:
1162: return (v);
1163: }
1164:
1165: void
1166: put_u64(void *vp, u_int64_t v)
1167: {
1168: u_char *p = (u_char *)vp;
1169:
1170: p[0] = (u_char)(v >> 56) & 0xff;
1171: p[1] = (u_char)(v >> 48) & 0xff;
1172: p[2] = (u_char)(v >> 40) & 0xff;
1173: p[3] = (u_char)(v >> 32) & 0xff;
1174: p[4] = (u_char)(v >> 24) & 0xff;
1175: p[5] = (u_char)(v >> 16) & 0xff;
1176: p[6] = (u_char)(v >> 8) & 0xff;
1177: p[7] = (u_char)v & 0xff;
1178: }
1179:
1180: void
1181: put_u32(void *vp, u_int32_t v)
1182: {
1183: u_char *p = (u_char *)vp;
1184:
1185: p[0] = (u_char)(v >> 24) & 0xff;
1186: p[1] = (u_char)(v >> 16) & 0xff;
1187: p[2] = (u_char)(v >> 8) & 0xff;
1188: p[3] = (u_char)v & 0xff;
1189: }
1190:
1.93 djm 1191: void
1192: put_u32_le(void *vp, u_int32_t v)
1193: {
1194: u_char *p = (u_char *)vp;
1195:
1196: p[0] = (u_char)v & 0xff;
1197: p[1] = (u_char)(v >> 8) & 0xff;
1198: p[2] = (u_char)(v >> 16) & 0xff;
1199: p[3] = (u_char)(v >> 24) & 0xff;
1200: }
1.52 djm 1201:
1202: void
1203: put_u16(void *vp, u_int16_t v)
1204: {
1205: u_char *p = (u_char *)vp;
1206:
1207: p[0] = (u_char)(v >> 8) & 0xff;
1208: p[1] = (u_char)v & 0xff;
1209: }
1.68 dtucker 1210:
1211: void
1212: ms_subtract_diff(struct timeval *start, int *ms)
1213: {
1214: struct timeval diff, finish;
1215:
1.119 dtucker 1216: monotime_tv(&finish);
1217: timersub(&finish, start, &diff);
1.68 dtucker 1218: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
1219: }
1220:
1221: void
1222: ms_to_timeval(struct timeval *tv, int ms)
1223: {
1224: if (ms < 0)
1225: ms = 0;
1226: tv->tv_sec = ms / 1000;
1227: tv->tv_usec = (ms % 1000) * 1000;
1.90 dtucker 1228: }
1229:
1.119 dtucker 1230: void
1231: monotime_ts(struct timespec *ts)
1232: {
1233: if (clock_gettime(CLOCK_MONOTONIC, ts) != 0)
1234: fatal("clock_gettime: %s", strerror(errno));
1235: }
1236:
1237: void
1238: monotime_tv(struct timeval *tv)
1239: {
1240: struct timespec ts;
1241:
1242: monotime_ts(&ts);
1243: tv->tv_sec = ts.tv_sec;
1244: tv->tv_usec = ts.tv_nsec / 1000;
1245: }
1246:
1.90 dtucker 1247: time_t
1248: monotime(void)
1249: {
1250: struct timespec ts;
1251:
1.119 dtucker 1252: monotime_ts(&ts);
1.90 dtucker 1253: return (ts.tv_sec);
1.102 dtucker 1254: }
1255:
1256: double
1257: monotime_double(void)
1258: {
1259: struct timespec ts;
1260:
1.119 dtucker 1261: monotime_ts(&ts);
1262: return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
1.81 djm 1263: }
1264:
1265: void
1266: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
1267: {
1268: bw->buflen = buflen;
1269: bw->rate = kbps;
1270: bw->thresh = bw->rate;
1271: bw->lamt = 0;
1272: timerclear(&bw->bwstart);
1273: timerclear(&bw->bwend);
1274: }
1275:
1276: /* Callback from read/write loop to insert bandwidth-limiting delays */
1277: void
1278: bandwidth_limit(struct bwlimit *bw, size_t read_len)
1279: {
1280: u_int64_t waitlen;
1281: struct timespec ts, rm;
1282:
1283: if (!timerisset(&bw->bwstart)) {
1.119 dtucker 1284: monotime_tv(&bw->bwstart);
1.81 djm 1285: return;
1286: }
1287:
1288: bw->lamt += read_len;
1289: if (bw->lamt < bw->thresh)
1290: return;
1291:
1.119 dtucker 1292: monotime_tv(&bw->bwend);
1.81 djm 1293: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
1294: if (!timerisset(&bw->bwend))
1295: return;
1296:
1297: bw->lamt *= 8;
1298: waitlen = (double)1000000L * bw->lamt / bw->rate;
1299:
1300: bw->bwstart.tv_sec = waitlen / 1000000L;
1301: bw->bwstart.tv_usec = waitlen % 1000000L;
1302:
1303: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
1304: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
1305:
1306: /* Adjust the wait time */
1307: if (bw->bwend.tv_sec) {
1308: bw->thresh /= 2;
1309: if (bw->thresh < bw->buflen / 4)
1310: bw->thresh = bw->buflen / 4;
1311: } else if (bw->bwend.tv_usec < 10000) {
1312: bw->thresh *= 2;
1313: if (bw->thresh > bw->buflen * 8)
1314: bw->thresh = bw->buflen * 8;
1315: }
1316:
1317: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1318: while (nanosleep(&ts, &rm) == -1) {
1319: if (errno != EINTR)
1320: break;
1321: ts = rm;
1322: }
1323: }
1324:
1325: bw->lamt = 0;
1.119 dtucker 1326: monotime_tv(&bw->bwstart);
1.84 djm 1327: }
1328:
1329: /* Make a template filename for mk[sd]temp() */
1330: void
1331: mktemp_proto(char *s, size_t len)
1332: {
1333: const char *tmpdir;
1334: int r;
1335:
1336: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1337: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1338: if (r > 0 && (size_t)r < len)
1339: return;
1340: }
1341: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1342: if (r < 0 || (size_t)r >= len)
1343: fatal("%s: template string too short", __func__);
1.68 dtucker 1344: }
1.83 djm 1345:
1346: static const struct {
1347: const char *name;
1348: int value;
1349: } ipqos[] = {
1.111 djm 1350: { "none", INT_MAX }, /* can't use 0 here; that's CS0 */
1.83 djm 1351: { "af11", IPTOS_DSCP_AF11 },
1352: { "af12", IPTOS_DSCP_AF12 },
1353: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 1354: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 1355: { "af22", IPTOS_DSCP_AF22 },
1356: { "af23", IPTOS_DSCP_AF23 },
1357: { "af31", IPTOS_DSCP_AF31 },
1358: { "af32", IPTOS_DSCP_AF32 },
1359: { "af33", IPTOS_DSCP_AF33 },
1360: { "af41", IPTOS_DSCP_AF41 },
1361: { "af42", IPTOS_DSCP_AF42 },
1362: { "af43", IPTOS_DSCP_AF43 },
1363: { "cs0", IPTOS_DSCP_CS0 },
1364: { "cs1", IPTOS_DSCP_CS1 },
1365: { "cs2", IPTOS_DSCP_CS2 },
1366: { "cs3", IPTOS_DSCP_CS3 },
1367: { "cs4", IPTOS_DSCP_CS4 },
1368: { "cs5", IPTOS_DSCP_CS5 },
1369: { "cs6", IPTOS_DSCP_CS6 },
1370: { "cs7", IPTOS_DSCP_CS7 },
1371: { "ef", IPTOS_DSCP_EF },
1372: { "lowdelay", IPTOS_LOWDELAY },
1373: { "throughput", IPTOS_THROUGHPUT },
1374: { "reliability", IPTOS_RELIABILITY },
1375: { NULL, -1 }
1376: };
1377:
1378: int
1379: parse_ipqos(const char *cp)
1380: {
1381: u_int i;
1382: char *ep;
1383: long val;
1384:
1385: if (cp == NULL)
1386: return -1;
1387: for (i = 0; ipqos[i].name != NULL; i++) {
1388: if (strcasecmp(cp, ipqos[i].name) == 0)
1389: return ipqos[i].value;
1390: }
1391: /* Try parsing as an integer */
1392: val = strtol(cp, &ep, 0);
1393: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1394: return -1;
1395: return val;
1396: }
1397:
1.85 stevesk 1398: const char *
1399: iptos2str(int iptos)
1400: {
1401: int i;
1402: static char iptos_str[sizeof "0xff"];
1403:
1404: for (i = 0; ipqos[i].name != NULL; i++) {
1405: if (ipqos[i].value == iptos)
1406: return ipqos[i].name;
1407: }
1408: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1409: return iptos_str;
1.92 djm 1410: }
1411:
1412: void
1413: lowercase(char *s)
1414: {
1415: for (; *s; s++)
1416: *s = tolower((u_char)*s);
1.94 millert 1417: }
1418:
1419: int
1420: unix_listener(const char *path, int backlog, int unlink_first)
1421: {
1422: struct sockaddr_un sunaddr;
1423: int saved_errno, sock;
1424:
1425: memset(&sunaddr, 0, sizeof(sunaddr));
1426: sunaddr.sun_family = AF_UNIX;
1.121 djm 1427: if (strlcpy(sunaddr.sun_path, path,
1428: sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1429: error("%s: path \"%s\" too long for Unix domain socket",
1430: __func__, path);
1.94 millert 1431: errno = ENAMETOOLONG;
1432: return -1;
1433: }
1434:
1435: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1436: if (sock < 0) {
1437: saved_errno = errno;
1.121 djm 1438: error("%s: socket: %.100s", __func__, strerror(errno));
1.94 millert 1439: errno = saved_errno;
1440: return -1;
1441: }
1442: if (unlink_first == 1) {
1443: if (unlink(path) != 0 && errno != ENOENT)
1444: error("unlink(%s): %.100s", path, strerror(errno));
1445: }
1446: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1447: saved_errno = errno;
1.121 djm 1448: error("%s: cannot bind to path %s: %s",
1449: __func__, path, strerror(errno));
1.122 djm 1450: close(sock);
1.94 millert 1451: errno = saved_errno;
1452: return -1;
1453: }
1454: if (listen(sock, backlog) < 0) {
1455: saved_errno = errno;
1.122 djm 1456: error("%s: cannot listen on path %s: %s",
1457: __func__, path, strerror(errno));
1.94 millert 1458: close(sock);
1459: unlink(path);
1460: errno = saved_errno;
1461: return -1;
1462: }
1463: return sock;
1.85 stevesk 1464: }
1.104 djm 1465:
1466: /*
1467: * Compares two strings that maybe be NULL. Returns non-zero if strings
1468: * are both NULL or are identical, returns zero otherwise.
1469: */
1470: static int
1471: strcmp_maybe_null(const char *a, const char *b)
1472: {
1473: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1474: return 0;
1475: if (a != NULL && strcmp(a, b) != 0)
1476: return 0;
1477: return 1;
1478: }
1479:
1480: /*
1481: * Compare two forwards, returning non-zero if they are identical or
1482: * zero otherwise.
1483: */
1484: int
1485: forward_equals(const struct Forward *a, const struct Forward *b)
1486: {
1487: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1488: return 0;
1489: if (a->listen_port != b->listen_port)
1490: return 0;
1491: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1492: return 0;
1493: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1494: return 0;
1495: if (a->connect_port != b->connect_port)
1496: return 0;
1497: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1498: return 0;
1499: /* allocated_port and handle are not checked */
1.107 dtucker 1500: return 1;
1501: }
1502:
1503: /* returns 1 if process is already daemonized, 0 otherwise */
1504: int
1505: daemonized(void)
1506: {
1507: int fd;
1508:
1509: if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1510: close(fd);
1511: return 0; /* have controlling terminal */
1512: }
1513: if (getppid() != 1)
1514: return 0; /* parent is not init */
1515: if (getsid(0) != getpid())
1516: return 0; /* not session leader */
1517: debug3("already daemonized");
1.106 dtucker 1518: return 1;
1519: }
1.112 djm 1520:
1521:
1522: /*
1523: * Splits 's' into an argument vector. Handles quoted string and basic
1524: * escape characters (\\, \", \'). Caller must free the argument vector
1525: * and its members.
1526: */
1527: int
1528: argv_split(const char *s, int *argcp, char ***argvp)
1529: {
1530: int r = SSH_ERR_INTERNAL_ERROR;
1531: int argc = 0, quote, i, j;
1532: char *arg, **argv = xcalloc(1, sizeof(*argv));
1533:
1534: *argvp = NULL;
1535: *argcp = 0;
1536:
1537: for (i = 0; s[i] != '\0'; i++) {
1538: /* Skip leading whitespace */
1539: if (s[i] == ' ' || s[i] == '\t')
1540: continue;
1541:
1542: /* Start of a token */
1543: quote = 0;
1544: if (s[i] == '\\' &&
1545: (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\'))
1546: i++;
1547: else if (s[i] == '\'' || s[i] == '"')
1548: quote = s[i++];
1549:
1550: argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
1551: arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
1552: argv[argc] = NULL;
1553:
1554: /* Copy the token in, removing escapes */
1555: for (j = 0; s[i] != '\0'; i++) {
1556: if (s[i] == '\\') {
1557: if (s[i + 1] == '\'' ||
1558: s[i + 1] == '\"' ||
1559: s[i + 1] == '\\') {
1560: i++; /* Skip '\' */
1561: arg[j++] = s[i];
1562: } else {
1563: /* Unrecognised escape */
1564: arg[j++] = s[i];
1565: }
1566: } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
1567: break; /* done */
1568: else if (quote != 0 && s[i] == quote)
1569: break; /* done */
1570: else
1571: arg[j++] = s[i];
1572: }
1573: if (s[i] == '\0') {
1574: if (quote != 0) {
1575: /* Ran out of string looking for close quote */
1576: r = SSH_ERR_INVALID_FORMAT;
1577: goto out;
1578: }
1579: break;
1580: }
1581: }
1582: /* Success */
1583: *argcp = argc;
1584: *argvp = argv;
1585: argc = 0;
1586: argv = NULL;
1587: r = 0;
1588: out:
1589: if (argc != 0 && argv != NULL) {
1590: for (i = 0; i < argc; i++)
1591: free(argv[i]);
1592: free(argv);
1593: }
1594: return r;
1595: }
1596:
1597: /*
1598: * Reassemble an argument vector into a string, quoting and escaping as
1599: * necessary. Caller must free returned string.
1600: */
1601: char *
1602: argv_assemble(int argc, char **argv)
1603: {
1604: int i, j, ws, r;
1605: char c, *ret;
1606: struct sshbuf *buf, *arg;
1607:
1608: if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
1609: fatal("%s: sshbuf_new failed", __func__);
1610:
1611: for (i = 0; i < argc; i++) {
1612: ws = 0;
1613: sshbuf_reset(arg);
1614: for (j = 0; argv[i][j] != '\0'; j++) {
1615: r = 0;
1616: c = argv[i][j];
1617: switch (c) {
1618: case ' ':
1619: case '\t':
1620: ws = 1;
1621: r = sshbuf_put_u8(arg, c);
1622: break;
1623: case '\\':
1624: case '\'':
1625: case '"':
1626: if ((r = sshbuf_put_u8(arg, '\\')) != 0)
1627: break;
1628: /* FALLTHROUGH */
1629: default:
1630: r = sshbuf_put_u8(arg, c);
1631: break;
1632: }
1633: if (r != 0)
1634: fatal("%s: sshbuf_put_u8: %s",
1635: __func__, ssh_err(r));
1636: }
1637: if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
1638: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
1639: (r = sshbuf_putb(buf, arg)) != 0 ||
1640: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
1641: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1642: }
1643: if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
1644: fatal("%s: malloc failed", __func__);
1645: memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
1646: ret[sshbuf_len(buf)] = '\0';
1647: sshbuf_free(buf);
1648: sshbuf_free(arg);
1649: return ret;
1650: }
1651:
1652: /* Returns 0 if pid exited cleanly, non-zero otherwise */
1653: int
1.113 djm 1654: exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
1.112 djm 1655: {
1656: int status;
1657:
1658: while (waitpid(pid, &status, 0) == -1) {
1659: if (errno != EINTR) {
1660: error("%s: waitpid: %s", tag, strerror(errno));
1661: return -1;
1662: }
1663: }
1664: if (WIFSIGNALED(status)) {
1665: error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
1666: return -1;
1667: } else if (WEXITSTATUS(status) != 0) {
1.113 djm 1668: do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
1669: "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
1.112 djm 1670: return -1;
1671: }
1672: return 0;
1673: }
1674:
1675: /*
1676: * Check a given path for security. This is defined as all components
1677: * of the path to the file must be owned by either the owner of
1678: * of the file or root and no directories must be group or world writable.
1679: *
1680: * XXX Should any specific check be done for sym links ?
1681: *
1682: * Takes a file name, its stat information (preferably from fstat() to
1683: * avoid races), the uid of the expected owner, their home directory and an
1684: * error buffer plus max size as arguments.
1685: *
1686: * Returns 0 on success and -1 on failure
1687: */
1688: int
1689: safe_path(const char *name, struct stat *stp, const char *pw_dir,
1690: uid_t uid, char *err, size_t errlen)
1691: {
1692: char buf[PATH_MAX], homedir[PATH_MAX];
1693: char *cp;
1694: int comparehome = 0;
1695: struct stat st;
1696:
1697: if (realpath(name, buf) == NULL) {
1698: snprintf(err, errlen, "realpath %s failed: %s", name,
1699: strerror(errno));
1700: return -1;
1701: }
1702: if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
1703: comparehome = 1;
1704:
1705: if (!S_ISREG(stp->st_mode)) {
1706: snprintf(err, errlen, "%s is not a regular file", buf);
1707: return -1;
1708: }
1709: if ((stp->st_uid != 0 && stp->st_uid != uid) ||
1710: (stp->st_mode & 022) != 0) {
1711: snprintf(err, errlen, "bad ownership or modes for file %s",
1712: buf);
1713: return -1;
1714: }
1715:
1716: /* for each component of the canonical path, walking upwards */
1717: for (;;) {
1718: if ((cp = dirname(buf)) == NULL) {
1719: snprintf(err, errlen, "dirname() failed");
1720: return -1;
1721: }
1722: strlcpy(buf, cp, sizeof(buf));
1723:
1724: if (stat(buf, &st) < 0 ||
1725: (st.st_uid != 0 && st.st_uid != uid) ||
1726: (st.st_mode & 022) != 0) {
1727: snprintf(err, errlen,
1728: "bad ownership or modes for directory %s", buf);
1729: return -1;
1730: }
1731:
1732: /* If are past the homedir then we can stop */
1733: if (comparehome && strcmp(homedir, buf) == 0)
1734: break;
1735:
1736: /*
1737: * dirname should always complete with a "/" path,
1738: * but we can be paranoid and check for "." too
1739: */
1740: if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
1741: break;
1742: }
1743: return 0;
1744: }
1745:
1746: /*
1747: * Version of safe_path() that accepts an open file descriptor to
1748: * avoid races.
1749: *
1750: * Returns 0 on success and -1 on failure
1751: */
1752: int
1753: safe_path_fd(int fd, const char *file, struct passwd *pw,
1754: char *err, size_t errlen)
1755: {
1756: struct stat st;
1757:
1758: /* check the open file to avoid races */
1759: if (fstat(fd, &st) < 0) {
1760: snprintf(err, errlen, "cannot stat file %s: %s",
1761: file, strerror(errno));
1762: return -1;
1763: }
1764: return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
1765: }
1766:
1767: /*
1768: * Sets the value of the given variable in the environment. If the variable
1769: * already exists, its value is overridden.
1770: */
1771: void
1772: child_set_env(char ***envp, u_int *envsizep, const char *name,
1773: const char *value)
1774: {
1775: char **env;
1776: u_int envsize;
1777: u_int i, namelen;
1778:
1779: if (strchr(name, '=') != NULL) {
1780: error("Invalid environment variable \"%.100s\"", name);
1781: return;
1782: }
1783:
1784: /*
1785: * Find the slot where the value should be stored. If the variable
1786: * already exists, we reuse the slot; otherwise we append a new slot
1787: * at the end of the array, expanding if necessary.
1788: */
1789: env = *envp;
1790: namelen = strlen(name);
1791: for (i = 0; env[i]; i++)
1792: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
1793: break;
1794: if (env[i]) {
1795: /* Reuse the slot. */
1796: free(env[i]);
1797: } else {
1798: /* New variable. Expand if necessary. */
1799: envsize = *envsizep;
1800: if (i >= envsize - 1) {
1801: if (envsize >= 1000)
1802: fatal("child_set_env: too many env vars");
1803: envsize += 50;
1804: env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
1805: *envsizep = envsize;
1806: }
1807: /* Need to set the NULL pointer at end of array beyond the new slot. */
1808: env[i + 1] = NULL;
1809: }
1810:
1811: /* Allocate space and format the variable in the appropriate slot. */
1.125 djm 1812: /* XXX xasprintf */
1.112 djm 1813: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
1814: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
1815: }
1816:
1.114 millert 1817: /*
1818: * Check and optionally lowercase a domain name, also removes trailing '.'
1819: * Returns 1 on success and 0 on failure, storing an error message in errstr.
1820: */
1821: int
1822: valid_domain(char *name, int makelower, const char **errstr)
1823: {
1824: size_t i, l = strlen(name);
1825: u_char c, last = '\0';
1826: static char errbuf[256];
1827:
1828: if (l == 0) {
1829: strlcpy(errbuf, "empty domain name", sizeof(errbuf));
1830: goto bad;
1831: }
1832: if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
1833: snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
1834: "starts with invalid character", name);
1835: goto bad;
1836: }
1837: for (i = 0; i < l; i++) {
1838: c = tolower((u_char)name[i]);
1839: if (makelower)
1840: name[i] = (char)c;
1841: if (last == '.' && c == '.') {
1842: snprintf(errbuf, sizeof(errbuf), "domain name "
1843: "\"%.100s\" contains consecutive separators", name);
1844: goto bad;
1845: }
1846: if (c != '.' && c != '-' && !isalnum(c) &&
1847: c != '_') /* technically invalid, but common */ {
1848: snprintf(errbuf, sizeof(errbuf), "domain name "
1849: "\"%.100s\" contains invalid characters", name);
1850: goto bad;
1851: }
1852: last = c;
1853: }
1854: if (name[l - 1] == '.')
1855: name[l - 1] = '\0';
1856: if (errstr != NULL)
1857: *errstr = NULL;
1858: return 1;
1859: bad:
1860: if (errstr != NULL)
1861: *errstr = errbuf;
1862: return 0;
1.120 dtucker 1863: }
1864:
1865: const char *
1866: atoi_err(const char *nptr, int *val)
1867: {
1868: const char *errstr = NULL;
1869: long long num;
1870:
1871: if (nptr == NULL || *nptr == '\0')
1872: return "missing";
1873: num = strtonum(nptr, 0, INT_MAX, &errstr);
1874: if (errstr == NULL)
1875: *val = (int)num;
1876: return errstr;
1.127 djm 1877: }
1878:
1879: int
1880: parse_absolute_time(const char *s, uint64_t *tp)
1881: {
1882: struct tm tm;
1883: time_t tt;
1884: char buf[32], *fmt;
1885:
1886: *tp = 0;
1887:
1888: /*
1889: * POSIX strptime says "The application shall ensure that there
1890: * is white-space or other non-alphanumeric characters between
1891: * any two conversion specifications" so arrange things this way.
1892: */
1893: switch (strlen(s)) {
1894: case 8: /* YYYYMMDD */
1895: fmt = "%Y-%m-%d";
1896: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
1897: break;
1898: case 12: /* YYYYMMDDHHMM */
1899: fmt = "%Y-%m-%dT%H:%M";
1900: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s",
1901: s, s + 4, s + 6, s + 8, s + 10);
1902: break;
1903: case 14: /* YYYYMMDDHHMMSS */
1904: fmt = "%Y-%m-%dT%H:%M:%S";
1905: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
1906: s, s + 4, s + 6, s + 8, s + 10, s + 12);
1907: break;
1908: default:
1909: return SSH_ERR_INVALID_FORMAT;
1910: }
1911:
1912: memset(&tm, 0, sizeof(tm));
1913: if (strptime(buf, fmt, &tm) == NULL)
1914: return SSH_ERR_INVALID_FORMAT;
1915: if ((tt = mktime(&tm)) < 0)
1916: return SSH_ERR_INVALID_FORMAT;
1917: /* success */
1918: *tp = (uint64_t)tt;
1919: return 0;
1920: }
1921:
1922: void
1923: format_absolute_time(uint64_t t, char *buf, size_t len)
1924: {
1925: time_t tt = t > INT_MAX ? INT_MAX : t; /* XXX revisit in 2038 :P */
1926: struct tm tm;
1927:
1928: localtime_r(&tt, &tm);
1929: strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
1.114 millert 1930: }
![[BACK]](/icons/back.gif){kind=icon}
Return to misc.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh