2 * Copyright (c) 2000 Markus Friedl. All rights reserved.
3 * Copyright (c) 2005 Damien Miller. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include <sys/ioctl.h>
29 #include <netinet/tcp.h>
33 #ifdef SSH_TUN_OPENBSD
41 /* remove newline at end of string */
47 if (*t == '\n' || *t == '\r') {
57 /* set/unset filedescriptor to non-blocking */
63 val = fcntl(fd, F_GETFL, 0);
65 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
68 if (val & O_NONBLOCK) {
69 debug3("fd %d is O_NONBLOCK", fd);
72 debug2("fd %d setting O_NONBLOCK", fd);
74 if (fcntl(fd, F_SETFL, val) == -1) {
75 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
83 unset_nonblock(int fd)
87 val = fcntl(fd, F_GETFL, 0);
89 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
92 if (!(val & O_NONBLOCK)) {
93 debug3("fd %d is not O_NONBLOCK", fd);
96 debug("fd %d clearing O_NONBLOCK", fd);
98 if (fcntl(fd, F_SETFL, val) == -1) {
99 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
100 fd, strerror(errno));
106 /* disable nagle on socket */
114 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
115 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
119 debug2("fd %d is TCP_NODELAY", fd);
123 debug2("fd %d setting TCP_NODELAY", fd);
124 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
125 error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
128 /* Characters considered whitespace in strsep calls. */
129 #define WHITESPACE " \t\r\n"
132 /* return next token in configuration line */
144 *s = strpbrk(*s, WHITESPACE QUOTE "=");
149 memmove(*s, *s + 1, strlen(*s)); /* move nul too */
150 /* Find matching quote */
151 if ((*s = strpbrk(*s, QUOTE)) == NULL) {
152 return (NULL); /* no matching quote */
159 /* Allow only one '=' to be skipped */
164 /* Skip any extra whitespace after first token */
165 *s += strspn(*s + 1, WHITESPACE) + 1;
166 if (*s[0] == '=' && !wspace)
167 *s += strspn(*s + 1, WHITESPACE) + 1;
173 pwcopy(struct passwd *pw)
175 struct passwd *copy = xmalloc(sizeof(*copy));
177 memset(copy, 0, sizeof(*copy));
178 copy->pw_name = xstrdup(pw->pw_name);
179 copy->pw_passwd = xstrdup(pw->pw_passwd);
180 copy->pw_gecos = xstrdup(pw->pw_gecos);
181 copy->pw_uid = pw->pw_uid;
182 copy->pw_gid = pw->pw_gid;
183 #ifdef HAVE_PW_EXPIRE_IN_PASSWD
184 copy->pw_expire = pw->pw_expire;
186 #ifdef HAVE_PW_CHANGE_IN_PASSWD
187 copy->pw_change = pw->pw_change;
189 #ifdef HAVE_PW_CLASS_IN_PASSWD
190 copy->pw_class = xstrdup(pw->pw_class);
192 copy->pw_dir = xstrdup(pw->pw_dir);
193 copy->pw_shell = xstrdup(pw->pw_shell);
198 * Convert ASCII string to TCP/IP port number.
199 * Port must be >0 and <=65535.
200 * Return 0 if invalid.
203 a2port(const char *s)
209 port = strtol(s, &endp, 0);
210 if (s == endp || *endp != '\0' ||
211 (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) ||
212 port <= 0 || port > 65535)
219 a2tun(const char *s, int *remote)
221 const char *errstr = NULL;
225 if (remote != NULL) {
226 *remote = SSH_TUNID_ANY;
228 if ((ep = strchr(sp, ':')) == NULL) {
230 return (a2tun(s, NULL));
233 *remote = a2tun(ep, NULL);
234 tun = a2tun(sp, NULL);
236 return (*remote == SSH_TUNID_ERR ? *remote : tun);
239 if (strcasecmp(s, "any") == 0)
240 return (SSH_TUNID_ANY);
242 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
244 return (SSH_TUNID_ERR);
250 #define MINUTES (SECONDS * 60)
251 #define HOURS (MINUTES * 60)
252 #define DAYS (HOURS * 24)
253 #define WEEKS (DAYS * 7)
256 * Convert a time string into seconds; format is
260 * Valid time qualifiers are:
274 * Return -1 if time string is invalid.
277 convtime(const char *s)
287 if (p == NULL || *p == '\0')
291 secs = strtol(p, &endp, 10);
293 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
332 * Search for next delimiter between hostnames/addresses and ports.
333 * Argument may be modified (for termination).
334 * Returns *cp if parsing succeeds.
335 * *cp is set to the start of the next delimiter, if one was found.
336 * If this is the last field, *cp is set to NULL.
343 if (cp == NULL || *cp == NULL)
348 if ((s = strchr(s, ']')) == NULL)
352 } else if ((s = strpbrk(s, ":/")) == NULL)
353 s = *cp + strlen(*cp); /* skip to end (see first case below) */
357 *cp = NULL; /* no more fields*/
362 *s = '\0'; /* terminate */
374 cleanhostname(char *host)
376 if (*host == '[' && host[strlen(host) - 1] == ']') {
377 host[strlen(host) - 1] = '\0';
388 if (*cp == ':') /* Leading colon is part of file name. */
394 if (*cp == '@' && *(cp+1) == '[')
396 if (*cp == ']' && *(cp+1) == ':' && flag)
398 if (*cp == ':' && !flag)
406 /* function to assist building execv() arguments */
408 addargs(arglist *args, char *fmt, ...)
416 r = vasprintf(&cp, fmt, ap);
419 fatal("addargs: argument too long");
421 nalloc = args->nalloc;
422 if (args->list == NULL) {
425 } else if (args->num+2 >= nalloc)
428 args->list = xrealloc(args->list, nalloc * sizeof(char *));
429 args->nalloc = nalloc;
430 args->list[args->num++] = cp;
431 args->list[args->num] = NULL;
435 replacearg(arglist *args, u_int which, char *fmt, ...)
442 r = vasprintf(&cp, fmt, ap);
445 fatal("replacearg: argument too long");
447 if (which >= args->num)
448 fatal("replacearg: tried to replace invalid arg %d >= %d",
450 xfree(args->list[which]);
451 args->list[which] = cp;
455 freeargs(arglist *args)
459 if (args->list != NULL) {
460 for (i = 0; i < args->num; i++)
461 xfree(args->list[i]);
463 args->nalloc = args->num = 0;
469 * Expands tildes in the file name. Returns data allocated by xmalloc.
470 * Warning: this calls getpw*.
473 tilde_expand_filename(const char *filename, uid_t uid)
476 char user[128], ret[MAXPATHLEN];
480 if (*filename != '~')
481 return (xstrdup(filename));
484 path = strchr(filename, '/');
485 if (path != NULL && path > filename) { /* ~user/path */
486 slash = path - filename;
487 if (slash > sizeof(user) - 1)
488 fatal("tilde_expand_filename: ~username too long");
489 memcpy(user, filename, slash);
491 if ((pw = getpwnam(user)) == NULL)
492 fatal("tilde_expand_filename: No such user %s", user);
493 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
494 fatal("tilde_expand_filename: No such uid %d", uid);
496 if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
497 fatal("tilde_expand_filename: Path too long");
499 /* Make sure directory has a trailing '/' */
500 len = strlen(pw->pw_dir);
501 if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
502 strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
503 fatal("tilde_expand_filename: Path too long");
505 /* Skip leading '/' from specified path */
508 if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
509 fatal("tilde_expand_filename: Path too long");
511 return (xstrdup(ret));
515 * Expand a string with a set of %[char] escapes. A number of escapes may be
516 * specified as (char *escape_chars, char *replacement) pairs. The list must
517 * be terminated by a NULL escape_char. Returns replaced string in memory
518 * allocated by xmalloc.
521 percent_expand(const char *string, ...)
523 #define EXPAND_MAX_KEYS 16
527 } keys[EXPAND_MAX_KEYS];
528 u_int num_keys, i, j;
533 va_start(ap, string);
534 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
535 keys[num_keys].key = va_arg(ap, char *);
536 if (keys[num_keys].key == NULL)
538 keys[num_keys].repl = va_arg(ap, char *);
539 if (keys[num_keys].repl == NULL)
540 fatal("percent_expand: NULL replacement");
544 if (num_keys >= EXPAND_MAX_KEYS)
545 fatal("percent_expand: too many keys");
549 for (i = 0; *string != '\0'; string++) {
550 if (*string != '%') {
553 if (i >= sizeof(buf))
554 fatal("percent_expand: string too long");
561 for (j = 0; j < num_keys; j++) {
562 if (strchr(keys[j].key, *string) != NULL) {
563 i = strlcat(buf, keys[j].repl, sizeof(buf));
564 if (i >= sizeof(buf))
565 fatal("percent_expand: string too long");
570 fatal("percent_expand: unknown key %%%c", *string);
572 return (xstrdup(buf));
573 #undef EXPAND_MAX_KEYS
577 * Read an entire line from a public key file into a static buffer, discarding
578 * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
581 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
584 while (fgets(buf, bufsz, f) != NULL) {
586 if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
589 debug("%s: %s line %lu exceeds size limit", __func__,
591 /* discard remainder of line */
592 while (fgetc(f) != '\n' && !feof(f))
600 tun_open(int tun, int mode)
602 #if defined(CUSTOM_SYS_TUN_OPEN)
603 return (sys_tun_open(tun, mode));
604 #elif defined(SSH_TUN_OPENBSD)
609 /* Open the tunnel device */
610 if (tun <= SSH_TUNID_MAX) {
611 snprintf(name, sizeof(name), "/dev/tun%d", tun);
612 fd = open(name, O_RDWR);
613 } else if (tun == SSH_TUNID_ANY) {
614 for (tun = 100; tun >= 0; tun--) {
615 snprintf(name, sizeof(name), "/dev/tun%d", tun);
616 if ((fd = open(name, O_RDWR)) >= 0)
620 debug("%s: invalid tunnel %u", __func__, tun);
625 debug("%s: %s open failed: %s", __func__, name, strerror(errno));
629 debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
631 /* Set the tunnel device operation mode */
632 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
633 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
636 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
639 /* Set interface mode */
640 ifr.ifr_flags &= ~IFF_UP;
641 if (mode == SSH_TUNMODE_ETHERNET)
642 ifr.ifr_flags |= IFF_LINK0;
644 ifr.ifr_flags &= ~IFF_LINK0;
645 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
648 /* Bring interface up */
649 ifr.ifr_flags |= IFF_UP;
650 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
661 debug("%s: failed to set %s mode %d: %s", __func__, name,
662 mode, strerror(errno));
665 error("Tunnel interfaces are not supported on this platform");
675 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
676 fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
679 while (++dupfd <= 2) {
680 /* Only clobber closed fds */
681 if (fcntl(dupfd, F_GETFL, 0) >= 0)
683 if (dup2(nullfd, dupfd) == -1) {
684 fprintf(stderr, "dup2: %s", strerror(errno));
693 tohex(const u_char *d, u_int l)
701 for (i = 0; i < l; i++) {
702 snprintf(b, sizeof(b), "%02x", d[i]);