Annotation of src/crypto/external/bsd/openssh/dist/misc.c, Revision 1.1.1.15
1.1.1.15! christos 1: /* $OpenBSD: misc.c,v 1.127 2018/03/12 00:52:01 djm Exp $ */
1.1 christos 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
4: * Copyright (c) 2005,2006 Damien Miller. All rights reserved.
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:
27: #include <sys/types.h>
28: #include <sys/ioctl.h>
29: #include <sys/socket.h>
1.1.1.14 christos 30: #include <sys/stat.h>
1.1.1.10 christos 31: #include <sys/time.h>
1.1.1.14 christos 32: #include <sys/wait.h>
1.1.1.7 christos 33: #include <sys/un.h>
1.1 christos 34:
35: #include <net/if.h>
36: #include <netinet/in.h>
1.1.1.3 christos 37: #include <netinet/ip.h>
1.1 christos 38: #include <netinet/tcp.h>
39:
1.1.1.7 christos 40: #include <ctype.h>
1.1 christos 41: #include <errno.h>
42: #include <fcntl.h>
43: #include <netdb.h>
44: #include <paths.h>
45: #include <pwd.h>
1.1.1.14 christos 46: #include <libgen.h>
1.1.1.8 christos 47: #include <limits.h>
1.1.1.14 christos 48: #include <signal.h>
1.1 christos 49: #include <stdarg.h>
50: #include <stdio.h>
51: #include <stdlib.h>
52: #include <string.h>
53: #include <unistd.h>
54:
55: #include "xmalloc.h"
56: #include "misc.h"
57: #include "log.h"
58: #include "ssh.h"
1.1.1.14 christos 59: #include "sshbuf.h"
60: #include "ssherr.h"
61: #include "uidswap.h"
1.1 christos 62:
63: /* remove newline at end of string */
64: char *
65: chop(char *s)
66: {
67: char *t = s;
68: while (*t) {
69: if (*t == '\n' || *t == '\r') {
70: *t = '\0';
71: return s;
72: }
73: t++;
74: }
75: return s;
76:
77: }
78:
79: /* set/unset filedescriptor to non-blocking */
80: int
81: set_nonblock(int fd)
82: {
83: int val;
84:
1.1.1.11 christos 85: val = fcntl(fd, F_GETFL);
1.1 christos 86: if (val < 0) {
1.1.1.11 christos 87: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.1 christos 88: return (-1);
89: }
90: if (val & O_NONBLOCK) {
91: debug3("fd %d is O_NONBLOCK", fd);
92: return (0);
93: }
94: debug2("fd %d setting O_NONBLOCK", fd);
95: val |= O_NONBLOCK;
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);
102: }
103:
104: int
105: unset_nonblock(int fd)
106: {
107: int val;
108:
1.1.1.11 christos 109: val = fcntl(fd, F_GETFL);
1.1 christos 110: if (val < 0) {
1.1.1.11 christos 111: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.1 christos 112: return (-1);
113: }
114: if (!(val & O_NONBLOCK)) {
115: debug3("fd %d is not O_NONBLOCK", fd);
116: return (0);
117: }
118: debug("fd %d clearing O_NONBLOCK", fd);
119: val &= ~O_NONBLOCK;
120: if (fcntl(fd, F_SETFL, val) == -1) {
121: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
122: fd, strerror(errno));
123: return (-1);
124: }
125: return (0);
126: }
127:
128: const char *
129: ssh_gai_strerror(int gaierr)
130: {
1.1.1.6 christos 131: if (gaierr == EAI_SYSTEM && errno != 0)
1.1 christos 132: return strerror(errno);
133: return gai_strerror(gaierr);
134: }
135:
136: /* disable nagle on socket */
137: void
138: set_nodelay(int fd)
139: {
140: int opt;
141: socklen_t optlen;
142:
143: optlen = sizeof opt;
144: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
145: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
146: return;
147: }
148: if (opt == 1) {
149: debug2("fd %d is TCP_NODELAY", fd);
150: return;
151: }
152: opt = 1;
153: debug2("fd %d setting TCP_NODELAY", fd);
154: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
155: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
156: }
157:
1.1.1.15! christos 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:
! 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:
! 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;
! 210: }
! 211:
1.1 christos 212: /* Characters considered whitespace in strsep calls. */
213: #define WHITESPACE " \t\r\n"
214: #define QUOTE "\""
215:
216: /* return next token in configuration line */
217: char *
218: strdelim(char **s)
219: {
220: char *old;
221: int wspace = 0;
222:
223: if (*s == NULL)
224: return NULL;
225:
226: old = *s;
227:
228: *s = strpbrk(*s, WHITESPACE QUOTE "=");
229: if (*s == NULL)
230: return (old);
231:
232: if (*s[0] == '\"') {
233: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
234: /* Find matching quote */
235: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
236: return (NULL); /* no matching quote */
237: } else {
238: *s[0] = '\0';
1.1.1.2 adam 239: *s += strspn(*s + 1, WHITESPACE) + 1;
1.1 christos 240: return (old);
241: }
242: }
243:
244: /* Allow only one '=' to be skipped */
245: if (*s[0] == '=')
246: wspace = 1;
247: *s[0] = '\0';
248:
249: /* Skip any extra whitespace after first token */
250: *s += strspn(*s + 1, WHITESPACE) + 1;
251: if (*s[0] == '=' && !wspace)
252: *s += strspn(*s + 1, WHITESPACE) + 1;
253:
254: return (old);
255: }
256:
257: struct passwd *
258: pwcopy(struct passwd *pw)
259: {
260: struct passwd *copy = xcalloc(1, sizeof(*copy));
261:
262: copy->pw_name = xstrdup(pw->pw_name);
263: copy->pw_passwd = xstrdup(pw->pw_passwd);
264: copy->pw_gecos = xstrdup(pw->pw_gecos);
265: copy->pw_uid = pw->pw_uid;
266: copy->pw_gid = pw->pw_gid;
267: copy->pw_expire = pw->pw_expire;
268: copy->pw_change = pw->pw_change;
269: copy->pw_class = xstrdup(pw->pw_class);
270: copy->pw_dir = xstrdup(pw->pw_dir);
271: copy->pw_shell = xstrdup(pw->pw_shell);
272: return copy;
273: }
274:
275: /*
276: * Convert ASCII string to TCP/IP port number.
277: * Port must be >=0 and <=65535.
278: * Return -1 if invalid.
279: */
280: int
281: a2port(const char *s)
282: {
283: long long port;
284: const char *errstr;
285:
286: port = strtonum(s, 0, 65535, &errstr);
287: if (errstr != NULL)
288: return -1;
289: return (int)port;
290: }
291:
292: int
293: a2tun(const char *s, int *remote)
294: {
295: const char *errstr = NULL;
296: char *sp, *ep;
297: int tun;
298:
299: if (remote != NULL) {
300: *remote = SSH_TUNID_ANY;
301: sp = xstrdup(s);
302: if ((ep = strchr(sp, ':')) == NULL) {
1.1.1.6 christos 303: free(sp);
1.1 christos 304: return (a2tun(s, NULL));
305: }
306: ep[0] = '\0'; ep++;
307: *remote = a2tun(ep, NULL);
308: tun = a2tun(sp, NULL);
1.1.1.6 christos 309: free(sp);
1.1 christos 310: return (*remote == SSH_TUNID_ERR ? *remote : tun);
311: }
312:
313: if (strcasecmp(s, "any") == 0)
314: return (SSH_TUNID_ANY);
315:
316: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
317: if (errstr != NULL)
318: return (SSH_TUNID_ERR);
319:
320: return (tun);
321: }
322:
323: #define SECONDS 1
324: #define MINUTES (SECONDS * 60)
325: #define HOURS (MINUTES * 60)
326: #define DAYS (HOURS * 24)
327: #define WEEKS (DAYS * 7)
328:
329: /*
330: * Convert a time string into seconds; format is
331: * a sequence of:
332: * time[qualifier]
333: *
334: * Valid time qualifiers are:
335: * <none> seconds
336: * s|S seconds
337: * m|M minutes
338: * h|H hours
339: * d|D days
340: * w|W weeks
341: *
342: * Examples:
343: * 90m 90 minutes
344: * 1h30m 90 minutes
345: * 2d 2 days
346: * 1w 1 week
347: *
348: * Return -1 if time string is invalid.
349: */
350: long
351: convtime(const char *s)
352: {
1.1.1.13 christos 353: long total, secs, multiplier = 1;
1.1 christos 354: const char *p;
355: char *endp;
356:
357: errno = 0;
358: total = 0;
359: p = s;
360:
361: if (p == NULL || *p == '\0')
362: return -1;
363:
364: while (*p) {
365: secs = strtol(p, &endp, 10);
366: if (p == endp ||
367: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
368: secs < 0)
369: return -1;
370:
371: switch (*endp++) {
372: case '\0':
373: endp--;
374: break;
375: case 's':
376: case 'S':
377: break;
378: case 'm':
379: case 'M':
1.1.1.13 christos 380: multiplier = MINUTES;
1.1 christos 381: break;
382: case 'h':
383: case 'H':
1.1.1.13 christos 384: multiplier = HOURS;
1.1 christos 385: break;
386: case 'd':
387: case 'D':
1.1.1.13 christos 388: multiplier = DAYS;
1.1 christos 389: break;
390: case 'w':
391: case 'W':
1.1.1.13 christos 392: multiplier = WEEKS;
1.1 christos 393: break;
394: default:
395: return -1;
396: }
1.1.1.13 christos 397: if (secs >= LONG_MAX / multiplier)
398: return -1;
399: secs *= multiplier;
400: if (total >= LONG_MAX - secs)
401: return -1;
1.1 christos 402: total += secs;
403: if (total < 0)
404: return -1;
405: p = endp;
406: }
407:
408: return total;
409: }
410:
411: /*
412: * Returns a standardized host+port identifier string.
413: * Caller must free returned string.
414: */
415: char *
416: put_host_port(const char *host, u_short port)
417: {
418: char *hoststr;
419:
420: if (port == 0 || port == SSH_DEFAULT_PORT)
421: return(xstrdup(host));
422: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
423: fatal("put_host_port: asprintf: %s", strerror(errno));
424: debug3("put_host_port: %s", hoststr);
425: return hoststr;
426: }
427:
428: /*
429: * Search for next delimiter between hostnames/addresses and ports.
430: * Argument may be modified (for termination).
431: * Returns *cp if parsing succeeds.
1.1.1.15! christos 432: * *cp is set to the start of the next field, if one was found.
! 433: * The delimiter char, if present, is stored in delim.
1.1 christos 434: * If this is the last field, *cp is set to NULL.
435: */
1.1.1.15! christos 436: static char *
! 437: hpdelim2(char **cp, char *delim)
1.1 christos 438: {
439: char *s, *old;
440:
441: if (cp == NULL || *cp == NULL)
442: return NULL;
443:
444: old = s = *cp;
445: if (*s == '[') {
446: if ((s = strchr(s, ']')) == NULL)
447: return NULL;
448: else
449: s++;
450: } else if ((s = strpbrk(s, ":/")) == NULL)
451: s = *cp + strlen(*cp); /* skip to end (see first case below) */
452:
453: switch (*s) {
454: case '\0':
455: *cp = NULL; /* no more fields*/
456: break;
457:
458: case ':':
459: case '/':
1.1.1.15! christos 460: if (delim != NULL)
! 461: *delim = *s;
1.1 christos 462: *s = '\0'; /* terminate */
463: *cp = s + 1;
464: break;
465:
466: default:
467: return NULL;
468: }
469:
470: return old;
471: }
472:
473: char *
1.1.1.15! christos 474: hpdelim(char **cp)
! 475: {
! 476: return hpdelim2(cp, NULL);
! 477: }
! 478:
! 479: char *
1.1 christos 480: cleanhostname(char *host)
481: {
482: if (*host == '[' && host[strlen(host) - 1] == ']') {
483: host[strlen(host) - 1] = '\0';
484: return (host + 1);
485: } else
486: return host;
487: }
488:
489: char *
490: colon(char *cp)
491: {
492: int flag = 0;
493:
494: if (*cp == ':') /* Leading colon is part of file name. */
1.1.1.2 adam 495: return NULL;
1.1 christos 496: if (*cp == '[')
497: flag = 1;
498:
499: for (; *cp; ++cp) {
500: if (*cp == '@' && *(cp+1) == '[')
501: flag = 1;
502: if (*cp == ']' && *(cp+1) == ':' && flag)
503: return (cp+1);
504: if (*cp == ':' && !flag)
505: return (cp);
506: if (*cp == '/')
1.1.1.2 adam 507: return NULL;
1.1 christos 508: }
1.1.1.2 adam 509: return NULL;
1.1 christos 510: }
511:
1.1.1.11 christos 512: /*
1.1.1.15! christos 513: * Parse a [user@]host:[path] string.
! 514: * Caller must free returned user, host and path.
! 515: * Any of the pointer return arguments may be NULL (useful for syntax checking).
! 516: * If user was not specified then *userp will be set to NULL.
! 517: * If host was not specified then *hostp will be set to NULL.
! 518: * If path was not specified then *pathp will be set to ".".
! 519: * Returns 0 on success, -1 on failure.
! 520: */
! 521: int
! 522: parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
! 523: {
! 524: char *user = NULL, *host = NULL, *path = NULL;
! 525: char *sdup, *tmp;
! 526: int ret = -1;
! 527:
! 528: if (userp != NULL)
! 529: *userp = NULL;
! 530: if (hostp != NULL)
! 531: *hostp = NULL;
! 532: if (pathp != NULL)
! 533: *pathp = NULL;
! 534:
! 535: sdup = xstrdup(s);
! 536:
! 537: /* Check for remote syntax: [user@]host:[path] */
! 538: if ((tmp = colon(sdup)) == NULL)
! 539: goto out;
! 540:
! 541: /* Extract optional path */
! 542: *tmp++ = '\0';
! 543: if (*tmp == '\0')
! 544: tmp = ".";
! 545: path = xstrdup(tmp);
! 546:
! 547: /* Extract optional user and mandatory host */
! 548: tmp = strrchr(sdup, '@');
! 549: if (tmp != NULL) {
! 550: *tmp++ = '\0';
! 551: host = xstrdup(cleanhostname(tmp));
! 552: if (*sdup != '\0')
! 553: user = xstrdup(sdup);
! 554: } else {
! 555: host = xstrdup(cleanhostname(sdup));
! 556: user = NULL;
! 557: }
! 558:
! 559: /* Success */
! 560: if (userp != NULL) {
! 561: *userp = user;
! 562: user = NULL;
! 563: }
! 564: if (hostp != NULL) {
! 565: *hostp = host;
! 566: host = NULL;
! 567: }
! 568: if (pathp != NULL) {
! 569: *pathp = path;
! 570: path = NULL;
! 571: }
! 572: ret = 0;
! 573: out:
! 574: free(sdup);
! 575: free(user);
! 576: free(host);
! 577: free(path);
! 578: return ret;
! 579: }
! 580:
! 581: /*
1.1.1.11 christos 582: * Parse a [user@]host[:port] string.
583: * Caller must free returned user and host.
584: * Any of the pointer return arguments may be NULL (useful for syntax checking).
585: * If user was not specified then *userp will be set to NULL.
586: * If port was not specified then *portp will be -1.
587: * Returns 0 on success, -1 on failure.
588: */
589: int
590: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
591: {
592: char *sdup, *cp, *tmp;
593: char *user = NULL, *host = NULL;
594: int port = -1, ret = -1;
595:
596: if (userp != NULL)
597: *userp = NULL;
598: if (hostp != NULL)
599: *hostp = NULL;
600: if (portp != NULL)
601: *portp = -1;
602:
603: if ((sdup = tmp = strdup(s)) == NULL)
604: return -1;
605: /* Extract optional username */
1.1.1.15! christos 606: if ((cp = strrchr(tmp, '@')) != NULL) {
1.1.1.11 christos 607: *cp = '\0';
608: if (*tmp == '\0')
609: goto out;
610: if ((user = strdup(tmp)) == NULL)
611: goto out;
612: tmp = cp + 1;
613: }
614: /* Extract mandatory hostname */
615: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
616: goto out;
617: host = xstrdup(cleanhostname(cp));
618: /* Convert and verify optional port */
619: if (tmp != NULL && *tmp != '\0') {
620: if ((port = a2port(tmp)) <= 0)
621: goto out;
622: }
623: /* Success */
624: if (userp != NULL) {
625: *userp = user;
626: user = NULL;
627: }
628: if (hostp != NULL) {
629: *hostp = host;
630: host = NULL;
631: }
632: if (portp != NULL)
633: *portp = port;
634: ret = 0;
635: out:
636: free(sdup);
637: free(user);
638: free(host);
639: return ret;
640: }
641:
1.1.1.15! christos 642: /*
! 643: * Converts a two-byte hex string to decimal.
! 644: * Returns the decimal value or -1 for invalid input.
! 645: */
! 646: static int
! 647: hexchar(const char *s)
! 648: {
! 649: unsigned char result[2];
! 650: int i;
! 651:
! 652: for (i = 0; i < 2; i++) {
! 653: if (s[i] >= '0' && s[i] <= '9')
! 654: result[i] = (unsigned char)(s[i] - '0');
! 655: else if (s[i] >= 'a' && s[i] <= 'f')
! 656: result[i] = (unsigned char)(s[i] - 'a') + 10;
! 657: else if (s[i] >= 'A' && s[i] <= 'F')
! 658: result[i] = (unsigned char)(s[i] - 'A') + 10;
! 659: else
! 660: return -1;
! 661: }
! 662: return (result[0] << 4) | result[1];
! 663: }
! 664:
! 665: /*
! 666: * Decode an url-encoded string.
! 667: * Returns a newly allocated string on success or NULL on failure.
! 668: */
! 669: static char *
! 670: urldecode(const char *src)
! 671: {
! 672: char *ret, *dst;
! 673: int ch;
! 674:
! 675: ret = xmalloc(strlen(src) + 1);
! 676: for (dst = ret; *src != '\0'; src++) {
! 677: switch (*src) {
! 678: case '+':
! 679: *dst++ = ' ';
! 680: break;
! 681: case '%':
! 682: if (!isxdigit((unsigned char)src[1]) ||
! 683: !isxdigit((unsigned char)src[2]) ||
! 684: (ch = hexchar(src + 1)) == -1) {
! 685: free(ret);
! 686: return NULL;
! 687: }
! 688: *dst++ = ch;
! 689: src += 2;
! 690: break;
! 691: default:
! 692: *dst++ = *src;
! 693: break;
! 694: }
! 695: }
! 696: *dst = '\0';
! 697:
! 698: return ret;
! 699: }
! 700:
! 701: /*
! 702: * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
! 703: * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
! 704: * Either user or path may be url-encoded (but not host or port).
! 705: * Caller must free returned user, host and path.
! 706: * Any of the pointer return arguments may be NULL (useful for syntax checking)
! 707: * but the scheme must always be specified.
! 708: * If user was not specified then *userp will be set to NULL.
! 709: * If port was not specified then *portp will be -1.
! 710: * If path was not specified then *pathp will be set to NULL.
! 711: * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
! 712: */
! 713: int
! 714: parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
! 715: int *portp, char **pathp)
! 716: {
! 717: char *uridup, *cp, *tmp, ch;
! 718: char *user = NULL, *host = NULL, *path = NULL;
! 719: int port = -1, ret = -1;
! 720: size_t len;
! 721:
! 722: len = strlen(scheme);
! 723: if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
! 724: return 1;
! 725: uri += len + 3;
! 726:
! 727: if (userp != NULL)
! 728: *userp = NULL;
! 729: if (hostp != NULL)
! 730: *hostp = NULL;
! 731: if (portp != NULL)
! 732: *portp = -1;
! 733: if (pathp != NULL)
! 734: *pathp = NULL;
! 735:
! 736: uridup = tmp = xstrdup(uri);
! 737:
! 738: /* Extract optional ssh-info (username + connection params) */
! 739: if ((cp = strchr(tmp, '@')) != NULL) {
! 740: char *delim;
! 741:
! 742: *cp = '\0';
! 743: /* Extract username and connection params */
! 744: if ((delim = strchr(tmp, ';')) != NULL) {
! 745: /* Just ignore connection params for now */
! 746: *delim = '\0';
! 747: }
! 748: if (*tmp == '\0') {
! 749: /* Empty username */
! 750: goto out;
! 751: }
! 752: if ((user = urldecode(tmp)) == NULL)
! 753: goto out;
! 754: tmp = cp + 1;
! 755: }
! 756:
! 757: /* Extract mandatory hostname */
! 758: if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
! 759: goto out;
! 760: host = xstrdup(cleanhostname(cp));
! 761: if (!valid_domain(host, 0, NULL))
! 762: goto out;
! 763:
! 764: if (tmp != NULL && *tmp != '\0') {
! 765: if (ch == ':') {
! 766: /* Convert and verify port. */
! 767: if ((cp = strchr(tmp, '/')) != NULL)
! 768: *cp = '\0';
! 769: if ((port = a2port(tmp)) <= 0)
! 770: goto out;
! 771: tmp = cp ? cp + 1 : NULL;
! 772: }
! 773: if (tmp != NULL && *tmp != '\0') {
! 774: /* Extract optional path */
! 775: if ((path = urldecode(tmp)) == NULL)
! 776: goto out;
! 777: }
! 778: }
! 779:
! 780: /* Success */
! 781: if (userp != NULL) {
! 782: *userp = user;
! 783: user = NULL;
! 784: }
! 785: if (hostp != NULL) {
! 786: *hostp = host;
! 787: host = NULL;
! 788: }
! 789: if (portp != NULL)
! 790: *portp = port;
! 791: if (pathp != NULL) {
! 792: *pathp = path;
! 793: path = NULL;
! 794: }
! 795: ret = 0;
! 796: out:
! 797: free(uridup);
! 798: free(user);
! 799: free(host);
! 800: free(path);
! 801: return ret;
! 802: }
! 803:
1.1 christos 804: /* function to assist building execv() arguments */
805: void
806: addargs(arglist *args, char *fmt, ...)
807: {
808: va_list ap;
809: char *cp;
810: u_int nalloc;
811: int r;
812:
813: va_start(ap, fmt);
814: r = vasprintf(&cp, fmt, ap);
815: va_end(ap);
816: if (r == -1)
817: fatal("addargs: argument too long");
818:
819: nalloc = args->nalloc;
820: if (args->list == NULL) {
821: nalloc = 32;
822: args->num = 0;
823: } else if (args->num+2 >= nalloc)
824: nalloc *= 2;
825:
1.1.1.14 christos 826: args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *));
1.1 christos 827: args->nalloc = nalloc;
828: args->list[args->num++] = cp;
829: args->list[args->num] = NULL;
830: }
831:
832: void
833: replacearg(arglist *args, u_int which, char *fmt, ...)
834: {
835: va_list ap;
836: char *cp;
837: int r;
838:
839: va_start(ap, fmt);
840: r = vasprintf(&cp, fmt, ap);
841: va_end(ap);
842: if (r == -1)
843: fatal("replacearg: argument too long");
844:
845: if (which >= args->num)
846: fatal("replacearg: tried to replace invalid arg %d >= %d",
847: which, args->num);
1.1.1.6 christos 848: free(args->list[which]);
1.1 christos 849: args->list[which] = cp;
850: }
851:
852: void
853: freeargs(arglist *args)
854: {
855: u_int i;
856:
857: if (args->list != NULL) {
858: for (i = 0; i < args->num; i++)
1.1.1.6 christos 859: free(args->list[i]);
860: free(args->list);
1.1 christos 861: args->nalloc = args->num = 0;
862: args->list = NULL;
863: }
864: }
865:
866: /*
867: * Expands tildes in the file name. Returns data allocated by xmalloc.
868: * Warning: this calls getpw*.
869: */
870: char *
871: tilde_expand_filename(const char *filename, uid_t uid)
872: {
1.1.1.6 christos 873: const char *path, *sep;
874: char user[128], *ret;
1.1 christos 875: struct passwd *pw;
876: u_int len, slash;
877:
878: if (*filename != '~')
879: return (xstrdup(filename));
880: filename++;
881:
882: path = strchr(filename, '/');
883: if (path != NULL && path > filename) { /* ~user/path */
884: slash = path - filename;
885: if (slash > sizeof(user) - 1)
886: fatal("tilde_expand_filename: ~username too long");
887: memcpy(user, filename, slash);
888: user[slash] = '\0';
889: if ((pw = getpwnam(user)) == NULL)
890: fatal("tilde_expand_filename: No such user %s", user);
891: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
892: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
893:
894: /* Make sure directory has a trailing '/' */
895: len = strlen(pw->pw_dir);
1.1.1.6 christos 896: if (len == 0 || pw->pw_dir[len - 1] != '/')
897: sep = "/";
898: else
899: sep = "";
1.1 christos 900:
901: /* Skip leading '/' from specified path */
902: if (path != NULL)
903: filename = path + 1;
1.1.1.6 christos 904:
1.1.1.8 christos 905: if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX)
1.1 christos 906: fatal("tilde_expand_filename: Path too long");
907:
1.1.1.6 christos 908: return (ret);
1.1 christos 909: }
910:
911: /*
912: * Expand a string with a set of %[char] escapes. A number of escapes may be
913: * specified as (char *escape_chars, char *replacement) pairs. The list must
914: * be terminated by a NULL escape_char. Returns replaced string in memory
915: * allocated by xmalloc.
916: */
917: char *
918: percent_expand(const char *string, ...)
919: {
920: #define EXPAND_MAX_KEYS 16
1.1.1.2 adam 921: u_int num_keys, i, j;
1.1 christos 922: struct {
923: const char *key;
924: const char *repl;
925: } keys[EXPAND_MAX_KEYS];
926: char buf[4096];
927: va_list ap;
928:
929: /* Gather keys */
930: va_start(ap, string);
931: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
932: keys[num_keys].key = va_arg(ap, char *);
933: if (keys[num_keys].key == NULL)
934: break;
935: keys[num_keys].repl = va_arg(ap, char *);
936: if (keys[num_keys].repl == NULL)
1.1.1.2 adam 937: fatal("%s: NULL replacement", __func__);
1.1 christos 938: }
1.1.1.2 adam 939: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
940: fatal("%s: too many keys", __func__);
1.1 christos 941: va_end(ap);
942:
943: /* Expand string */
944: *buf = '\0';
945: for (i = 0; *string != '\0'; string++) {
946: if (*string != '%') {
947: append:
948: buf[i++] = *string;
949: if (i >= sizeof(buf))
1.1.1.2 adam 950: fatal("%s: string too long", __func__);
1.1 christos 951: buf[i] = '\0';
952: continue;
953: }
954: string++;
1.1.1.2 adam 955: /* %% case */
1.1 christos 956: if (*string == '%')
957: goto append;
1.1.1.10 christos 958: if (*string == '\0')
959: fatal("%s: invalid format", __func__);
1.1 christos 960: for (j = 0; j < num_keys; j++) {
961: if (strchr(keys[j].key, *string) != NULL) {
962: i = strlcat(buf, keys[j].repl, sizeof(buf));
963: if (i >= sizeof(buf))
1.1.1.2 adam 964: fatal("%s: string too long", __func__);
1.1 christos 965: break;
966: }
967: }
968: if (j >= num_keys)
1.1.1.2 adam 969: fatal("%s: unknown key %%%c", __func__, *string);
1.1 christos 970: }
971: return (xstrdup(buf));
972: #undef EXPAND_MAX_KEYS
973: }
974:
975: /*
976: * Read an entire line from a public key file into a static buffer, discarding
977: * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
978: */
979: int
980: read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
981: u_long *lineno)
982: {
983: while (fgets(buf, bufsz, f) != NULL) {
984: if (buf[0] == '\0')
985: continue;
986: (*lineno)++;
987: if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
988: return 0;
989: } else {
990: debug("%s: %s line %lu exceeds size limit", __func__,
991: filename, *lineno);
992: /* discard remainder of line */
993: while (fgetc(f) != '\n' && !feof(f))
994: ; /* nothing */
995: }
996: }
997: return -1;
998: }
999:
1000: int
1.1.1.15! christos 1001: tun_open(int tun, int mode, char **ifname)
1.1 christos 1002: {
1003: struct ifreq ifr;
1004: char name[100];
1005: int fd = -1, sock;
1.1.1.10 christos 1006: const char *tunbase = "tun";
1007:
1.1.1.15! christos 1008: if (ifname != NULL)
! 1009: *ifname = NULL;
! 1010:
1.1.1.10 christos 1011: if (mode == SSH_TUNMODE_ETHERNET)
1012: tunbase = "tap";
1.1 christos 1013:
1014: /* Open the tunnel device */
1015: if (tun <= SSH_TUNID_MAX) {
1.1.1.10 christos 1016: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.1 christos 1017: fd = open(name, O_RDWR);
1018: } else if (tun == SSH_TUNID_ANY) {
1019: for (tun = 100; tun >= 0; tun--) {
1.1.1.10 christos 1020: snprintf(name, sizeof(name), "/dev/%s%d",
1021: tunbase, tun);
1.1 christos 1022: if ((fd = open(name, O_RDWR)) >= 0)
1023: break;
1024: }
1025: } else {
1026: debug("%s: invalid tunnel %u", __func__, tun);
1.1.1.10 christos 1027: return -1;
1.1 christos 1028: }
1029:
1030: if (fd < 0) {
1.1.1.10 christos 1031: debug("%s: %s open: %s", __func__, name, strerror(errno));
1032: return -1;
1.1 christos 1033: }
1034:
1035: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
1036:
1.1.1.10 christos 1037: /* Bring interface up if it is not already */
1038: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
1.1 christos 1039: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1040: goto failed;
1041:
1.1.1.10 christos 1042: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
1043: debug("%s: get interface %s flags: %s", __func__,
1044: ifr.ifr_name, strerror(errno));
1.1 christos 1045: goto failed;
1.1.1.10 christos 1046: }
1.1 christos 1047:
1.1.1.10 christos 1048: if (!(ifr.ifr_flags & IFF_UP)) {
1049: ifr.ifr_flags |= IFF_UP;
1050: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
1051: debug("%s: activate interface %s: %s", __func__,
1052: ifr.ifr_name, strerror(errno));
1053: goto failed;
1054: }
1055: }
1.1 christos 1056:
1.1.1.15! christos 1057: if (ifname != NULL)
! 1058: *ifname = xstrdup(ifr.ifr_name);
! 1059:
1.1 christos 1060: close(sock);
1.1.1.10 christos 1061: return fd;
1.1 christos 1062:
1063: failed:
1064: if (fd >= 0)
1065: close(fd);
1066: if (sock >= 0)
1067: close(sock);
1.1.1.10 christos 1068: return -1;
1.1 christos 1069: }
1070:
1071: void
1072: sanitise_stdfd(void)
1073: {
1074: int nullfd, dupfd;
1075:
1076: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1077: fprintf(stderr, "Couldn't open /dev/null: %s\n",
1078: strerror(errno));
1079: exit(1);
1080: }
1.1.1.11 christos 1081: while (++dupfd <= STDERR_FILENO) {
1082: /* Only populate closed fds. */
1083: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
1084: if (dup2(nullfd, dupfd) == -1) {
1085: fprintf(stderr, "dup2: %s\n", strerror(errno));
1086: exit(1);
1087: }
1.1 christos 1088: }
1089: }
1.1.1.11 christos 1090: if (nullfd > STDERR_FILENO)
1.1 christos 1091: close(nullfd);
1092: }
1093:
1094: char *
1095: tohex(const void *vp, size_t l)
1096: {
1097: const u_char *p = (const u_char *)vp;
1098: char b[3], *r;
1099: size_t i, hl;
1100:
1101: if (l > 65536)
1102: return xstrdup("tohex: length > 65536");
1103:
1104: hl = l * 2 + 1;
1105: r = xcalloc(1, hl);
1106: for (i = 0; i < l; i++) {
1107: snprintf(b, sizeof(b), "%02x", p[i]);
1108: strlcat(r, b, hl);
1109: }
1110: return (r);
1111: }
1112:
1113: u_int64_t
1114: get_u64(const void *vp)
1115: {
1116: const u_char *p = (const u_char *)vp;
1117: u_int64_t v;
1118:
1119: v = (u_int64_t)p[0] << 56;
1120: v |= (u_int64_t)p[1] << 48;
1121: v |= (u_int64_t)p[2] << 40;
1122: v |= (u_int64_t)p[3] << 32;
1123: v |= (u_int64_t)p[4] << 24;
1124: v |= (u_int64_t)p[5] << 16;
1125: v |= (u_int64_t)p[6] << 8;
1126: v |= (u_int64_t)p[7];
1127:
1128: return (v);
1129: }
1130:
1131: u_int32_t
1132: get_u32(const void *vp)
1133: {
1134: const u_char *p = (const u_char *)vp;
1135: u_int32_t v;
1136:
1137: v = (u_int32_t)p[0] << 24;
1138: v |= (u_int32_t)p[1] << 16;
1139: v |= (u_int32_t)p[2] << 8;
1140: v |= (u_int32_t)p[3];
1141:
1142: return (v);
1143: }
1144:
1.1.1.7 christos 1145: u_int32_t
1146: get_u32_le(const void *vp)
1147: {
1148: const u_char *p = (const u_char *)vp;
1149: u_int32_t v;
1150:
1151: v = (u_int32_t)p[0];
1152: v |= (u_int32_t)p[1] << 8;
1153: v |= (u_int32_t)p[2] << 16;
1154: v |= (u_int32_t)p[3] << 24;
1155:
1156: return (v);
1157: }
1158:
1.1 christos 1159: u_int16_t
1160: get_u16(const void *vp)
1161: {
1162: const u_char *p = (const u_char *)vp;
1163: u_int16_t v;
1164:
1165: v = (u_int16_t)p[0] << 8;
1166: v |= (u_int16_t)p[1];
1167:
1168: return (v);
1169: }
1170:
1171: void
1172: put_u64(void *vp, u_int64_t v)
1173: {
1174: u_char *p = (u_char *)vp;
1175:
1176: p[0] = (u_char)(v >> 56) & 0xff;
1177: p[1] = (u_char)(v >> 48) & 0xff;
1178: p[2] = (u_char)(v >> 40) & 0xff;
1179: p[3] = (u_char)(v >> 32) & 0xff;
1180: p[4] = (u_char)(v >> 24) & 0xff;
1181: p[5] = (u_char)(v >> 16) & 0xff;
1182: p[6] = (u_char)(v >> 8) & 0xff;
1183: p[7] = (u_char)v & 0xff;
1184: }
1185:
1186: void
1187: put_u32(void *vp, u_int32_t v)
1188: {
1189: u_char *p = (u_char *)vp;
1190:
1191: p[0] = (u_char)(v >> 24) & 0xff;
1192: p[1] = (u_char)(v >> 16) & 0xff;
1193: p[2] = (u_char)(v >> 8) & 0xff;
1194: p[3] = (u_char)v & 0xff;
1195: }
1196:
1.1.1.7 christos 1197: void
1198: put_u32_le(void *vp, u_int32_t v)
1199: {
1200: u_char *p = (u_char *)vp;
1201:
1202: p[0] = (u_char)v & 0xff;
1203: p[1] = (u_char)(v >> 8) & 0xff;
1204: p[2] = (u_char)(v >> 16) & 0xff;
1205: p[3] = (u_char)(v >> 24) & 0xff;
1206: }
1.1 christos 1207:
1208: void
1209: put_u16(void *vp, u_int16_t v)
1210: {
1211: u_char *p = (u_char *)vp;
1212:
1213: p[0] = (u_char)(v >> 8) & 0xff;
1214: p[1] = (u_char)v & 0xff;
1215: }
1216:
1217: void
1218: ms_subtract_diff(struct timeval *start, int *ms)
1219: {
1220: struct timeval diff, finish;
1221:
1.1.1.15! christos 1222: monotime_tv(&finish);
! 1223: timersub(&finish, start, &diff);
1.1 christos 1224: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
1225: }
1226:
1227: void
1228: ms_to_timeval(struct timeval *tv, int ms)
1229: {
1230: if (ms < 0)
1231: ms = 0;
1232: tv->tv_sec = ms / 1000;
1233: tv->tv_usec = (ms % 1000) * 1000;
1234: }
1235:
1.1.1.15! christos 1236: void
! 1237: monotime_ts(struct timespec *ts)
! 1238: {
! 1239: if (clock_gettime(CLOCK_MONOTONIC, ts) != 0)
! 1240: fatal("clock_gettime: %s", strerror(errno));
! 1241: }
! 1242:
! 1243: void
! 1244: monotime_tv(struct timeval *tv)
! 1245: {
! 1246: struct timespec ts;
! 1247:
! 1248: monotime_ts(&ts);
! 1249: tv->tv_sec = ts.tv_sec;
! 1250: tv->tv_usec = ts.tv_nsec / 1000;
! 1251: }
! 1252:
1.1.1.6 christos 1253: time_t
1254: monotime(void)
1255: {
1256: struct timespec ts;
1257:
1.1.1.15! christos 1258: monotime_ts(&ts);
1.1.1.6 christos 1259: return (ts.tv_sec);
1260: }
1261:
1.1.1.11 christos 1262: double
1263: monotime_double(void)
1264: {
1265: struct timespec ts;
1266:
1.1.1.15! christos 1267: monotime_ts(&ts);
! 1268: return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
1.1.1.11 christos 1269: }
1270:
1.1.1.3 christos 1271: void
1272: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
1273: {
1274: bw->buflen = buflen;
1275: bw->rate = kbps;
1276: bw->thresh = bw->rate;
1277: bw->lamt = 0;
1278: timerclear(&bw->bwstart);
1279: timerclear(&bw->bwend);
1280: }
1281:
1282: /* Callback from read/write loop to insert bandwidth-limiting delays */
1283: void
1284: bandwidth_limit(struct bwlimit *bw, size_t read_len)
1285: {
1286: u_int64_t waitlen;
1287: struct timespec ts, rm;
1288:
1289: if (!timerisset(&bw->bwstart)) {
1.1.1.15! christos 1290: monotime_tv(&bw->bwstart);
1.1.1.3 christos 1291: return;
1292: }
1293:
1294: bw->lamt += read_len;
1295: if (bw->lamt < bw->thresh)
1296: return;
1297:
1.1.1.15! christos 1298: monotime_tv(&bw->bwend);
1.1.1.3 christos 1299: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
1300: if (!timerisset(&bw->bwend))
1301: return;
1302:
1303: bw->lamt *= 8;
1304: waitlen = (double)1000000L * bw->lamt / bw->rate;
1305:
1306: bw->bwstart.tv_sec = waitlen / 1000000L;
1307: bw->bwstart.tv_usec = waitlen % 1000000L;
1308:
1309: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
1310: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
1311:
1312: /* Adjust the wait time */
1313: if (bw->bwend.tv_sec) {
1314: bw->thresh /= 2;
1315: if (bw->thresh < bw->buflen / 4)
1316: bw->thresh = bw->buflen / 4;
1317: } else if (bw->bwend.tv_usec < 10000) {
1318: bw->thresh *= 2;
1319: if (bw->thresh > bw->buflen * 8)
1320: bw->thresh = bw->buflen * 8;
1321: }
1322:
1323: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1324: while (nanosleep(&ts, &rm) == -1) {
1325: if (errno != EINTR)
1326: break;
1327: ts = rm;
1328: }
1329: }
1330:
1331: bw->lamt = 0;
1.1.1.15! christos 1332: monotime_tv(&bw->bwstart);
1.1.1.3 christos 1333: }
1334:
1335: /* Make a template filename for mk[sd]temp() */
1336: void
1337: mktemp_proto(char *s, size_t len)
1338: {
1339: const char *tmpdir;
1340: int r;
1341:
1342: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1343: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1344: if (r > 0 && (size_t)r < len)
1345: return;
1346: }
1347: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1348: if (r < 0 || (size_t)r >= len)
1349: fatal("%s: template string too short", __func__);
1350: }
1351:
1352: static const struct {
1353: const char *name;
1354: int value;
1355: } ipqos[] = {
1.1.1.14 christos 1356: { "none", INT_MAX }, /* can't use 0 here; that's CS0 */
1.1.1.3 christos 1357: { "af11", IPTOS_DSCP_AF11 },
1358: { "af12", IPTOS_DSCP_AF12 },
1359: { "af13", IPTOS_DSCP_AF13 },
1.1.1.5 christos 1360: { "af21", IPTOS_DSCP_AF21 },
1.1.1.3 christos 1361: { "af22", IPTOS_DSCP_AF22 },
1362: { "af23", IPTOS_DSCP_AF23 },
1363: { "af31", IPTOS_DSCP_AF31 },
1364: { "af32", IPTOS_DSCP_AF32 },
1365: { "af33", IPTOS_DSCP_AF33 },
1366: { "af41", IPTOS_DSCP_AF41 },
1367: { "af42", IPTOS_DSCP_AF42 },
1368: { "af43", IPTOS_DSCP_AF43 },
1369: { "cs0", IPTOS_DSCP_CS0 },
1370: { "cs1", IPTOS_DSCP_CS1 },
1371: { "cs2", IPTOS_DSCP_CS2 },
1372: { "cs3", IPTOS_DSCP_CS3 },
1373: { "cs4", IPTOS_DSCP_CS4 },
1374: { "cs5", IPTOS_DSCP_CS5 },
1375: { "cs6", IPTOS_DSCP_CS6 },
1376: { "cs7", IPTOS_DSCP_CS7 },
1377: { "ef", IPTOS_DSCP_EF },
1378: { "lowdelay", IPTOS_LOWDELAY },
1379: { "throughput", IPTOS_THROUGHPUT },
1380: { "reliability", IPTOS_RELIABILITY },
1381: { NULL, -1 }
1382: };
1383:
1.1.1.2 adam 1384: int
1.1.1.3 christos 1385: parse_ipqos(const char *cp)
1.1.1.2 adam 1386: {
1.1.1.3 christos 1387: u_int i;
1388: char *ep;
1389: long val;
1.1.1.2 adam 1390:
1.1.1.3 christos 1391: if (cp == NULL)
1392: return -1;
1393: for (i = 0; ipqos[i].name != NULL; i++) {
1394: if (strcasecmp(cp, ipqos[i].name) == 0)
1395: return ipqos[i].value;
1396: }
1397: /* Try parsing as an integer */
1398: val = strtol(cp, &ep, 0);
1399: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1400: return -1;
1401: return val;
1.1.1.2 adam 1402: }
1.1.1.3 christos 1403:
1.1.1.4 christos 1404: const char *
1405: iptos2str(int iptos)
1406: {
1407: int i;
1408: static char iptos_str[sizeof "0xff"];
1409:
1410: for (i = 0; ipqos[i].name != NULL; i++) {
1411: if (ipqos[i].value == iptos)
1412: return ipqos[i].name;
1413: }
1414: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1415: return iptos_str;
1416: }
1.1.1.7 christos 1417:
1418: void
1419: lowercase(char *s)
1420: {
1421: for (; *s; s++)
1422: *s = tolower((u_char)*s);
1423: }
1424:
1425: int
1426: unix_listener(const char *path, int backlog, int unlink_first)
1427: {
1428: struct sockaddr_un sunaddr;
1429: int saved_errno, sock;
1430:
1431: memset(&sunaddr, 0, sizeof(sunaddr));
1432: sunaddr.sun_family = AF_UNIX;
1.1.1.15! christos 1433: if (strlcpy(sunaddr.sun_path, path,
! 1434: sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
! 1435: error("%s: path \"%s\" too long for Unix domain socket",
! 1436: __func__, path);
1.1.1.7 christos 1437: errno = ENAMETOOLONG;
1438: return -1;
1439: }
1440:
1441: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1442: if (sock < 0) {
1443: saved_errno = errno;
1.1.1.15! christos 1444: error("%s: socket: %.100s", __func__, strerror(errno));
1.1.1.7 christos 1445: errno = saved_errno;
1446: return -1;
1447: }
1448: if (unlink_first == 1) {
1449: if (unlink(path) != 0 && errno != ENOENT)
1450: error("unlink(%s): %.100s", path, strerror(errno));
1451: }
1452: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1453: saved_errno = errno;
1.1.1.15! christos 1454: error("%s: cannot bind to path %s: %s",
! 1455: __func__, path, strerror(errno));
1.1.1.7 christos 1456: close(sock);
1457: errno = saved_errno;
1458: return -1;
1459: }
1460: if (listen(sock, backlog) < 0) {
1461: saved_errno = errno;
1.1.1.15! christos 1462: error("%s: cannot listen on path %s: %s",
! 1463: __func__, path, strerror(errno));
1.1.1.7 christos 1464: close(sock);
1465: unlink(path);
1466: errno = saved_errno;
1467: return -1;
1468: }
1469: return sock;
1470: }
1.1.1.11 christos 1471:
1472: /*
1473: * Compares two strings that maybe be NULL. Returns non-zero if strings
1474: * are both NULL or are identical, returns zero otherwise.
1475: */
1476: static int
1477: strcmp_maybe_null(const char *a, const char *b)
1478: {
1479: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1480: return 0;
1481: if (a != NULL && strcmp(a, b) != 0)
1482: return 0;
1483: return 1;
1484: }
1485:
1486: /*
1487: * Compare two forwards, returning non-zero if they are identical or
1488: * zero otherwise.
1489: */
1490: int
1491: forward_equals(const struct Forward *a, const struct Forward *b)
1492: {
1493: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1494: return 0;
1495: if (a->listen_port != b->listen_port)
1496: return 0;
1497: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1498: return 0;
1499: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1500: return 0;
1501: if (a->connect_port != b->connect_port)
1502: return 0;
1503: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1504: return 0;
1505: /* allocated_port and handle are not checked */
1506: return 1;
1507: }
1508:
1.1.1.12 christos 1509: /* returns 1 if bind to specified port by specified user is permitted */
1510: int
1511: bind_permitted(int port, uid_t uid)
1512: {
1513: if (port < IPPORT_RESERVED && uid != 0)
1514: return 0;
1515: return 1;
1516: }
1517:
1518: /* returns 1 if process is already daemonized, 0 otherwise */
1519: int
1520: daemonized(void)
1521: {
1522: int fd;
1523:
1524: if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1525: close(fd);
1526: return 0; /* have controlling terminal */
1527: }
1528: if (getppid() != 1)
1529: return 0; /* parent is not init */
1530: if (getsid(0) != getpid())
1531: return 0; /* not session leader */
1532: debug3("already daemonized");
1533: return 1;
1534: }
1.1.1.14 christos 1535:
1536:
1537: /*
1538: * Splits 's' into an argument vector. Handles quoted string and basic
1539: * escape characters (\\, \", \'). Caller must free the argument vector
1540: * and its members.
1541: */
1542: int
1543: argv_split(const char *s, int *argcp, char ***argvp)
1544: {
1545: int r = SSH_ERR_INTERNAL_ERROR;
1546: int argc = 0, quote, i, j;
1547: char *arg, **argv = xcalloc(1, sizeof(*argv));
1548:
1549: *argvp = NULL;
1550: *argcp = 0;
1551:
1552: for (i = 0; s[i] != '\0'; i++) {
1553: /* Skip leading whitespace */
1554: if (s[i] == ' ' || s[i] == '\t')
1555: continue;
1556:
1557: /* Start of a token */
1558: quote = 0;
1559: if (s[i] == '\\' &&
1560: (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\'))
1561: i++;
1562: else if (s[i] == '\'' || s[i] == '"')
1563: quote = s[i++];
1564:
1565: argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
1566: arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
1567: argv[argc] = NULL;
1568:
1569: /* Copy the token in, removing escapes */
1570: for (j = 0; s[i] != '\0'; i++) {
1571: if (s[i] == '\\') {
1572: if (s[i + 1] == '\'' ||
1573: s[i + 1] == '\"' ||
1574: s[i + 1] == '\\') {
1575: i++; /* Skip '\' */
1576: arg[j++] = s[i];
1577: } else {
1578: /* Unrecognised escape */
1579: arg[j++] = s[i];
1580: }
1581: } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
1582: break; /* done */
1583: else if (quote != 0 && s[i] == quote)
1584: break; /* done */
1585: else
1586: arg[j++] = s[i];
1587: }
1588: if (s[i] == '\0') {
1589: if (quote != 0) {
1590: /* Ran out of string looking for close quote */
1591: r = SSH_ERR_INVALID_FORMAT;
1592: goto out;
1593: }
1594: break;
1595: }
1596: }
1597: /* Success */
1598: *argcp = argc;
1599: *argvp = argv;
1600: argc = 0;
1601: argv = NULL;
1602: r = 0;
1603: out:
1604: if (argc != 0 && argv != NULL) {
1605: for (i = 0; i < argc; i++)
1606: free(argv[i]);
1607: free(argv);
1608: }
1609: return r;
1610: }
1611:
1612: /*
1613: * Reassemble an argument vector into a string, quoting and escaping as
1614: * necessary. Caller must free returned string.
1615: */
1616: char *
1617: argv_assemble(int argc, char **argv)
1618: {
1619: int i, j, ws, r;
1620: char c, *ret;
1621: struct sshbuf *buf, *arg;
1622:
1623: if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
1624: fatal("%s: sshbuf_new failed", __func__);
1625:
1626: for (i = 0; i < argc; i++) {
1627: ws = 0;
1628: sshbuf_reset(arg);
1629: for (j = 0; argv[i][j] != '\0'; j++) {
1630: r = 0;
1631: c = argv[i][j];
1632: switch (c) {
1633: case ' ':
1634: case '\t':
1635: ws = 1;
1636: r = sshbuf_put_u8(arg, c);
1637: break;
1638: case '\\':
1639: case '\'':
1640: case '"':
1641: if ((r = sshbuf_put_u8(arg, '\\')) != 0)
1642: break;
1643: /* FALLTHROUGH */
1644: default:
1645: r = sshbuf_put_u8(arg, c);
1646: break;
1647: }
1648: if (r != 0)
1649: fatal("%s: sshbuf_put_u8: %s",
1650: __func__, ssh_err(r));
1651: }
1652: if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
1653: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
1654: (r = sshbuf_putb(buf, arg)) != 0 ||
1655: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
1656: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1657: }
1658: if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
1659: fatal("%s: malloc failed", __func__);
1660: memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
1661: ret[sshbuf_len(buf)] = '\0';
1662: sshbuf_free(buf);
1663: sshbuf_free(arg);
1664: return ret;
1665: }
1666:
1667: /* Returns 0 if pid exited cleanly, non-zero otherwise */
1668: int
1669: exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
1670: {
1671: int status;
1672:
1673: while (waitpid(pid, &status, 0) == -1) {
1674: if (errno != EINTR) {
1675: error("%s: waitpid: %s", tag, strerror(errno));
1676: return -1;
1677: }
1678: }
1679: if (WIFSIGNALED(status)) {
1680: error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
1681: return -1;
1682: } else if (WEXITSTATUS(status) != 0) {
1683: do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
1684: "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
1685: return -1;
1686: }
1687: return 0;
1688: }
1689:
1690: /*
1691: * Check a given path for security. This is defined as all components
1692: * of the path to the file must be owned by either the owner of
1693: * of the file or root and no directories must be group or world writable.
1694: *
1695: * XXX Should any specific check be done for sym links ?
1696: *
1697: * Takes a file name, its stat information (preferably from fstat() to
1698: * avoid races), the uid of the expected owner, their home directory and an
1699: * error buffer plus max size as arguments.
1700: *
1701: * Returns 0 on success and -1 on failure
1702: */
1703: int
1704: safe_path(const char *name, struct stat *stp, const char *pw_dir,
1705: uid_t uid, char *err, size_t errlen)
1706: {
1707: char buf[PATH_MAX], homedir[PATH_MAX];
1708: char *cp;
1709: int comparehome = 0;
1710: struct stat st;
1711:
1712: if (realpath(name, buf) == NULL) {
1713: snprintf(err, errlen, "realpath %s failed: %s", name,
1714: strerror(errno));
1715: return -1;
1716: }
1717: if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
1718: comparehome = 1;
1719:
1720: if (!S_ISREG(stp->st_mode)) {
1721: snprintf(err, errlen, "%s is not a regular file", buf);
1722: return -1;
1723: }
1724: if ((stp->st_uid != 0 && stp->st_uid != uid) ||
1725: (stp->st_mode & 022) != 0) {
1726: snprintf(err, errlen, "bad ownership or modes for file %s",
1727: buf);
1728: return -1;
1729: }
1730:
1731: /* for each component of the canonical path, walking upwards */
1732: for (;;) {
1733: if ((cp = dirname(buf)) == NULL) {
1734: snprintf(err, errlen, "dirname() failed");
1735: return -1;
1736: }
1737: strlcpy(buf, cp, sizeof(buf));
1738:
1739: if (stat(buf, &st) < 0 ||
1740: (st.st_uid != 0 && st.st_uid != uid) ||
1741: (st.st_mode & 022) != 0) {
1742: snprintf(err, errlen,
1743: "bad ownership or modes for directory %s", buf);
1744: return -1;
1745: }
1746:
1747: /* If are past the homedir then we can stop */
1748: if (comparehome && strcmp(homedir, buf) == 0)
1749: break;
1750:
1751: /*
1752: * dirname should always complete with a "/" path,
1753: * but we can be paranoid and check for "." too
1754: */
1755: if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
1756: break;
1757: }
1758: return 0;
1759: }
1760:
1761: /*
1762: * Version of safe_path() that accepts an open file descriptor to
1763: * avoid races.
1764: *
1765: * Returns 0 on success and -1 on failure
1766: */
1767: int
1768: safe_path_fd(int fd, const char *file, struct passwd *pw,
1769: char *err, size_t errlen)
1770: {
1771: struct stat st;
1772:
1773: /* check the open file to avoid races */
1774: if (fstat(fd, &st) < 0) {
1775: snprintf(err, errlen, "cannot stat file %s: %s",
1776: file, strerror(errno));
1777: return -1;
1778: }
1779: return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
1780: }
1781:
1782: /*
1783: * Sets the value of the given variable in the environment. If the variable
1784: * already exists, its value is overridden.
1785: */
1786: void
1787: child_set_env(char ***envp, u_int *envsizep, const char *name,
1788: const char *value)
1789: {
1790: char **env;
1791: u_int envsize;
1792: u_int i, namelen;
1793:
1794: if (strchr(name, '=') != NULL) {
1795: error("Invalid environment variable \"%.100s\"", name);
1796: return;
1797: }
1798:
1799: /*
1800: * Find the slot where the value should be stored. If the variable
1801: * already exists, we reuse the slot; otherwise we append a new slot
1802: * at the end of the array, expanding if necessary.
1803: */
1804: env = *envp;
1805: namelen = strlen(name);
1806: for (i = 0; env[i]; i++)
1807: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
1808: break;
1809: if (env[i]) {
1810: /* Reuse the slot. */
1811: free(env[i]);
1812: } else {
1813: /* New variable. Expand if necessary. */
1814: envsize = *envsizep;
1815: if (i >= envsize - 1) {
1816: if (envsize >= 1000)
1817: fatal("child_set_env: too many env vars");
1818: envsize += 50;
1819: env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
1820: *envsizep = envsize;
1821: }
1822: /* Need to set the NULL pointer at end of array beyond the new slot. */
1823: env[i + 1] = NULL;
1824: }
1825:
1826: /* Allocate space and format the variable in the appropriate slot. */
1.1.1.15! christos 1827: /* XXX xasprintf */
1.1.1.14 christos 1828: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
1829: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
1830: }
1831:
1.1.1.15! christos 1832: /*
! 1833: * Check and optionally lowercase a domain name, also removes trailing '.'
! 1834: * Returns 1 on success and 0 on failure, storing an error message in errstr.
! 1835: */
! 1836: int
! 1837: valid_domain(char *name, int makelower, const char **errstr)
! 1838: {
! 1839: size_t i, l = strlen(name);
! 1840: u_char c, last = '\0';
! 1841: static char errbuf[256];
! 1842:
! 1843: if (l == 0) {
! 1844: strlcpy(errbuf, "empty domain name", sizeof(errbuf));
! 1845: goto bad;
! 1846: }
! 1847: if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
! 1848: snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
! 1849: "starts with invalid character", name);
! 1850: goto bad;
! 1851: }
! 1852: for (i = 0; i < l; i++) {
! 1853: c = tolower((u_char)name[i]);
! 1854: if (makelower)
! 1855: name[i] = (char)c;
! 1856: if (last == '.' && c == '.') {
! 1857: snprintf(errbuf, sizeof(errbuf), "domain name "
! 1858: "\"%.100s\" contains consecutive separators", name);
! 1859: goto bad;
! 1860: }
! 1861: if (c != '.' && c != '-' && !isalnum(c) &&
! 1862: c != '_') /* technically invalid, but common */ {
! 1863: snprintf(errbuf, sizeof(errbuf), "domain name "
! 1864: "\"%.100s\" contains invalid characters", name);
! 1865: goto bad;
! 1866: }
! 1867: last = c;
! 1868: }
! 1869: if (name[l - 1] == '.')
! 1870: name[l - 1] = '\0';
! 1871: if (errstr != NULL)
! 1872: *errstr = NULL;
! 1873: return 1;
! 1874: bad:
! 1875: if (errstr != NULL)
! 1876: *errstr = errbuf;
! 1877: return 0;
! 1878: }
! 1879:
! 1880: const char *
! 1881: atoi_err(const char *nptr, int *val)
! 1882: {
! 1883: const char *errstr = NULL;
! 1884: long long num;
! 1885:
! 1886: if (nptr == NULL || *nptr == '\0')
! 1887: return "missing";
! 1888: num = strtonum(nptr, 0, INT_MAX, &errstr);
! 1889: if (errstr == NULL)
! 1890: *val = (int)num;
! 1891: return errstr;
! 1892: }
! 1893:
! 1894: int
! 1895: parse_absolute_time(const char *s, uint64_t *tp)
! 1896: {
! 1897: struct tm tm;
! 1898: time_t tt;
! 1899: char buf[32], *fmt;
! 1900:
! 1901: *tp = 0;
! 1902:
! 1903: /*
! 1904: * POSIX strptime says "The application shall ensure that there
! 1905: * is white-space or other non-alphanumeric characters between
! 1906: * any two conversion specifications" so arrange things this way.
! 1907: */
! 1908: switch (strlen(s)) {
! 1909: case 8: /* YYYYMMDD */
! 1910: fmt = "%Y-%m-%d";
! 1911: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
! 1912: break;
! 1913: case 12: /* YYYYMMDDHHMM */
! 1914: fmt = "%Y-%m-%dT%H:%M";
! 1915: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s",
! 1916: s, s + 4, s + 6, s + 8, s + 10);
! 1917: break;
! 1918: case 14: /* YYYYMMDDHHMMSS */
! 1919: fmt = "%Y-%m-%dT%H:%M:%S";
! 1920: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
! 1921: s, s + 4, s + 6, s + 8, s + 10, s + 12);
! 1922: break;
! 1923: default:
! 1924: return SSH_ERR_INVALID_FORMAT;
! 1925: }
! 1926:
! 1927: memset(&tm, 0, sizeof(tm));
! 1928: if (strptime(buf, fmt, &tm) == NULL)
! 1929: return SSH_ERR_INVALID_FORMAT;
! 1930: if ((tt = mktime(&tm)) < 0)
! 1931: return SSH_ERR_INVALID_FORMAT;
! 1932: /* success */
! 1933: *tp = (uint64_t)tt;
! 1934: return 0;
! 1935: }
! 1936:
! 1937: void
! 1938: format_absolute_time(uint64_t t, char *buf, size_t len)
! 1939: {
! 1940: time_t tt = t > INT_MAX ? INT_MAX : t; /* XXX revisit in 2038 :P */
! 1941: struct tm tm;
! 1942:
! 1943: localtime_r(&tt, &tm);
! 1944: strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
! 1945: }
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