blob: 5204c1e9f22f0b0e53a92d63c5aa2a10e20ebb5b [file] [log] [blame]
dtucker@openbsd.orge2c0a212019-11-22 06:50:30 +00001/* $OpenBSD: misc.c,v 1.143 2019/11/22 06:50:30 dtucker Exp $ */
Damien Millere4340be2000-09-16 13:29:08 +11002/*
3 * Copyright (c) 2000 Markus Friedl. All rights reserved.
Damien Miller3f941882006-03-31 23:13:02 +11004 * Copyright (c) 2005,2006 Damien Miller. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +11005 *
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
Damien Miller61c51502000-08-18 14:01:04 +100027#include "includes.h"
Damien Miller17e91c02006-03-15 11:28:34 +110028
Damien Miller9f2abc42006-07-10 20:53:08 +100029#include <sys/types.h>
Damien Millerd7834352006-08-05 12:39:39 +100030#include <sys/ioctl.h>
Damien Miller8ec8c3e2006-07-10 20:35:38 +100031#include <sys/socket.h>
djm@openbsd.orgde4ae072017-08-18 05:36:45 +000032#include <sys/stat.h>
dtucker@openbsd.org65a3c0d2016-01-20 09:22:39 +000033#include <sys/time.h>
djm@openbsd.orgde4ae072017-08-18 05:36:45 +000034#include <sys/wait.h>
Damien Miller7acefbb2014-07-18 14:11:24 +100035#include <sys/un.h>
Damien Miller8ec8c3e2006-07-10 20:35:38 +100036
deraadt@openbsd.org2ae4f332015-01-16 06:40:12 +000037#include <limits.h>
djm@openbsd.orgde4ae072017-08-18 05:36:45 +000038#ifdef HAVE_LIBGEN_H
39# include <libgen.h>
40#endif
Darren Tucker6fc7e1c2019-10-28 15:53:25 +110041#ifdef HAVE_POLL_H
djm@openbsd.org0a843d92018-12-27 03:25:24 +000042#include <poll.h>
Darren Tucker6fc7e1c2019-10-28 15:53:25 +110043#endif
djm@openbsd.orgde4ae072017-08-18 05:36:45 +000044#include <signal.h>
Darren Tucker5d196262006-07-12 22:15:16 +100045#include <stdarg.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100046#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100047#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100048#include <string.h>
Damien Miller1708cb72011-01-13 12:21:34 +110049#include <time.h>
Damien Millere6b3b612006-07-24 14:01:23 +100050#include <unistd.h>
Darren Tucker5d196262006-07-12 22:15:16 +100051
Damien Miller8ec8c3e2006-07-10 20:35:38 +100052#include <netinet/in.h>
Damien Miller0dac6fb2010-11-20 15:19:38 +110053#include <netinet/in_systm.h>
54#include <netinet/ip.h>
Damien Miller3a4051e2006-03-15 11:19:42 +110055#include <netinet/tcp.h>
naddy@openbsd.org25813332018-10-05 14:26:09 +000056#include <arpa/inet.h>
Damien Miller8ec8c3e2006-07-10 20:35:38 +100057
Damien Millere9fc72e2013-10-15 12:14:12 +110058#include <ctype.h>
Darren Tucker39972492006-07-12 22:22:46 +100059#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100060#include <fcntl.h>
Darren Tucker4abde772007-12-29 02:43:51 +110061#include <netdb.h>
Damien Miller03e20032006-03-15 11:16:59 +110062#ifdef HAVE_PATHS_H
Damien Millera9263d02006-03-15 11:18:26 +110063# include <paths.h>
Damien Miller9f2abc42006-07-10 20:53:08 +100064#include <pwd.h>
Damien Miller03e20032006-03-15 11:16:59 +110065#endif
Damien Miller3beb8522006-01-02 23:40:10 +110066#ifdef SSH_TUN_OPENBSD
67#include <net/if.h>
68#endif
Damien Miller61c51502000-08-18 14:01:04 +100069
Damien Millerd7834352006-08-05 12:39:39 +100070#include "xmalloc.h"
Kevin Stevesb6e773a2001-02-04 13:20:36 +000071#include "misc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000072#include "log.h"
Darren Tuckerda345532006-07-10 23:04:19 +100073#include "ssh.h"
djm@openbsd.orgde4ae072017-08-18 05:36:45 +000074#include "sshbuf.h"
75#include "ssherr.h"
Damien Miller07949bf2017-08-23 20:13:18 +100076#include "platform.h"
Damien Miller61c51502000-08-18 14:01:04 +100077
Ben Lindstrom4cc240d2001-07-04 04:46:56 +000078/* remove newline at end of string */
Damien Miller61c51502000-08-18 14:01:04 +100079char *
80chop(char *s)
81{
82 char *t = s;
83 while (*t) {
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +000084 if (*t == '\n' || *t == '\r') {
Damien Miller61c51502000-08-18 14:01:04 +100085 *t = '\0';
86 return s;
87 }
88 t++;
89 }
90 return s;
91
92}
93
Ben Lindstrom4cc240d2001-07-04 04:46:56 +000094/* set/unset filedescriptor to non-blocking */
Damien Miller232711f2004-06-15 10:35:30 +100095int
Damien Miller61c51502000-08-18 14:01:04 +100096set_nonblock(int fd)
97{
98 int val;
Ben Lindstromc93e84c2001-05-12 00:08:37 +000099
krw@openbsd.org574def02016-04-02 14:37:42 +0000100 val = fcntl(fd, F_GETFL);
deraadt@openbsd.org4d28fa72019-06-28 13:35:04 +0000101 if (val == -1) {
krw@openbsd.org574def02016-04-02 14:37:42 +0000102 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
Damien Miller232711f2004-06-15 10:35:30 +1000103 return (-1);
Damien Miller61c51502000-08-18 14:01:04 +1000104 }
Damien Miller69b69aa2000-10-28 14:19:58 +1100105 if (val & O_NONBLOCK) {
Damien Miller232711f2004-06-15 10:35:30 +1000106 debug3("fd %d is O_NONBLOCK", fd);
107 return (0);
Damien Miller69b69aa2000-10-28 14:19:58 +1100108 }
Damien Milleref095ce2003-05-14 13:41:39 +1000109 debug2("fd %d setting O_NONBLOCK", fd);
Damien Miller61c51502000-08-18 14:01:04 +1000110 val |= O_NONBLOCK;
Damien Miller232711f2004-06-15 10:35:30 +1000111 if (fcntl(fd, F_SETFL, val) == -1) {
112 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
113 strerror(errno));
114 return (-1);
115 }
116 return (0);
Damien Miller61c51502000-08-18 14:01:04 +1000117}
118
Damien Miller232711f2004-06-15 10:35:30 +1000119int
Ben Lindstromc93e84c2001-05-12 00:08:37 +0000120unset_nonblock(int fd)
121{
122 int val;
123
krw@openbsd.org574def02016-04-02 14:37:42 +0000124 val = fcntl(fd, F_GETFL);
deraadt@openbsd.org4d28fa72019-06-28 13:35:04 +0000125 if (val == -1) {
krw@openbsd.org574def02016-04-02 14:37:42 +0000126 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
Damien Miller232711f2004-06-15 10:35:30 +1000127 return (-1);
Ben Lindstromc93e84c2001-05-12 00:08:37 +0000128 }
129 if (!(val & O_NONBLOCK)) {
Damien Miller232711f2004-06-15 10:35:30 +1000130 debug3("fd %d is not O_NONBLOCK", fd);
131 return (0);
Ben Lindstromc93e84c2001-05-12 00:08:37 +0000132 }
Ben Lindstrom352b1c22001-06-21 03:04:37 +0000133 debug("fd %d clearing O_NONBLOCK", fd);
Ben Lindstromc93e84c2001-05-12 00:08:37 +0000134 val &= ~O_NONBLOCK;
Damien Miller232711f2004-06-15 10:35:30 +1000135 if (fcntl(fd, F_SETFL, val) == -1) {
136 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
Ben Lindstrom84fcb312002-03-05 01:48:09 +0000137 fd, strerror(errno));
Damien Miller232711f2004-06-15 10:35:30 +1000138 return (-1);
139 }
140 return (0);
Ben Lindstromc93e84c2001-05-12 00:08:37 +0000141}
142
Darren Tucker4abde772007-12-29 02:43:51 +1100143const char *
144ssh_gai_strerror(int gaierr)
145{
Damien Miller7313fc92013-07-18 16:13:19 +1000146 if (gaierr == EAI_SYSTEM && errno != 0)
Darren Tucker912428c2008-01-01 20:33:35 +1100147 return strerror(errno);
148 return gai_strerror(gaierr);
Darren Tucker4abde772007-12-29 02:43:51 +1100149}
150
Damien Miller398e1cf2002-02-05 11:52:13 +1100151/* disable nagle on socket */
152void
153set_nodelay(int fd)
154{
Ben Lindstrome86de512002-03-05 01:28:14 +0000155 int opt;
156 socklen_t optlen;
Damien Miller398e1cf2002-02-05 11:52:13 +1100157
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +0000158 optlen = sizeof opt;
159 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
Darren Tucker6db8f932003-11-03 20:07:14 +1100160 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +0000161 return;
162 }
163 if (opt == 1) {
164 debug2("fd %d is TCP_NODELAY", fd);
165 return;
166 }
167 opt = 1;
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000168 debug2("fd %d setting TCP_NODELAY", fd);
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +0000169 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
Damien Miller398e1cf2002-02-05 11:52:13 +1100170 error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
171}
172
djm@openbsd.orgacf559e2017-10-25 00:15:35 +0000173/* Allow local port reuse in TIME_WAIT */
174int
175set_reuseaddr(int fd)
176{
177 int on = 1;
178
179 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
180 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
181 return -1;
182 }
183 return 0;
184}
185
djm@openbsd.org35eb33f2017-10-25 00:17:08 +0000186/* Get/set routing domain */
187char *
188get_rdomain(int fd)
189{
Damien Miller43c29bb2017-10-25 13:10:59 +1100190#if defined(HAVE_SYS_GET_RDOMAIN)
191 return sys_get_rdomain(fd);
192#elif defined(__OpenBSD__)
djm@openbsd.org35eb33f2017-10-25 00:17:08 +0000193 int rtable;
194 char *ret;
195 socklen_t len = sizeof(rtable);
196
197 if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) {
198 error("Failed to get routing domain for fd %d: %s",
199 fd, strerror(errno));
200 return NULL;
201 }
202 xasprintf(&ret, "%d", rtable);
203 return ret;
Damien Miller43c29bb2017-10-25 13:10:59 +1100204#else /* defined(__OpenBSD__) */
205 return NULL;
206#endif
djm@openbsd.org35eb33f2017-10-25 00:17:08 +0000207}
208
djm@openbsd.orgacf559e2017-10-25 00:15:35 +0000209int
210set_rdomain(int fd, const char *name)
211{
Damien Miller43c29bb2017-10-25 13:10:59 +1100212#if defined(HAVE_SYS_SET_RDOMAIN)
213 return sys_set_rdomain(fd, name);
214#elif defined(__OpenBSD__)
djm@openbsd.orgacf559e2017-10-25 00:15:35 +0000215 int rtable;
216 const char *errstr;
217
218 if (name == NULL)
219 return 0; /* default table */
220
221 rtable = (int)strtonum(name, 0, 255, &errstr);
222 if (errstr != NULL) {
223 /* Shouldn't happen */
224 error("Invalid routing domain \"%s\": %s", name, errstr);
225 return -1;
226 }
227 if (setsockopt(fd, SOL_SOCKET, SO_RTABLE,
228 &rtable, sizeof(rtable)) == -1) {
229 error("Failed to set routing domain %d on fd %d: %s",
230 rtable, fd, strerror(errno));
231 return -1;
232 }
233 return 0;
Damien Miller43c29bb2017-10-25 13:10:59 +1100234#else /* defined(__OpenBSD__) */
235 error("Setting routing domain is not supported on this platform");
236 return -1;
237#endif
djm@openbsd.orgacf559e2017-10-25 00:15:35 +0000238}
239
djm@openbsd.org0a843d92018-12-27 03:25:24 +0000240/*
dtucker@openbsd.orge2c0a212019-11-22 06:50:30 +0000241 * Wait up to *timeoutp milliseconds for events on fd. Updates
djm@openbsd.org0a843d92018-12-27 03:25:24 +0000242 * *timeoutp with time remaining.
243 * Returns 0 if fd ready or -1 on timeout or error (see errno).
244 */
dtucker@openbsd.orge2c0a212019-11-22 06:50:30 +0000245static int
246waitfd(int fd, int *timeoutp, short events)
djm@openbsd.org0a843d92018-12-27 03:25:24 +0000247{
248 struct pollfd pfd;
249 struct timeval t_start;
250 int oerrno, r;
251
252 monotime_tv(&t_start);
253 pfd.fd = fd;
dtucker@openbsd.orge2c0a212019-11-22 06:50:30 +0000254 pfd.events = events;
djm@openbsd.org0a843d92018-12-27 03:25:24 +0000255 for (; *timeoutp >= 0;) {
256 r = poll(&pfd, 1, *timeoutp);
257 oerrno = errno;
258 ms_subtract_diff(&t_start, timeoutp);
259 errno = oerrno;
260 if (r > 0)
261 return 0;
262 else if (r == -1 && errno != EAGAIN)
263 return -1;
264 else if (r == 0)
265 break;
266 }
267 /* timeout */
268 errno = ETIMEDOUT;
269 return -1;
270}
271
272/*
dtucker@openbsd.orge2c0a212019-11-22 06:50:30 +0000273 * Wait up to *timeoutp milliseconds for fd to be readable. Updates
274 * *timeoutp with time remaining.
275 * Returns 0 if fd ready or -1 on timeout or error (see errno).
276 */
277int
278waitrfd(int fd, int *timeoutp) {
279 return waitfd(fd, timeoutp, POLLIN);
280}
281
282/*
djm@openbsd.org0a843d92018-12-27 03:25:24 +0000283 * Attempt a non-blocking connect(2) to the specified address, waiting up to
284 * *timeoutp milliseconds for the connection to complete. If the timeout is
285 * <=0, then wait indefinitely.
286 *
287 * Returns 0 on success or -1 on failure.
288 */
289int
290timeout_connect(int sockfd, const struct sockaddr *serv_addr,
291 socklen_t addrlen, int *timeoutp)
292{
293 int optval = 0;
294 socklen_t optlen = sizeof(optval);
295
296 /* No timeout: just do a blocking connect() */
297 if (timeoutp == NULL || *timeoutp <= 0)
298 return connect(sockfd, serv_addr, addrlen);
299
300 set_nonblock(sockfd);
301 if (connect(sockfd, serv_addr, addrlen) == 0) {
302 /* Succeeded already? */
303 unset_nonblock(sockfd);
304 return 0;
305 } else if (errno != EINPROGRESS)
306 return -1;
307
dtucker@openbsd.orge2c0a212019-11-22 06:50:30 +0000308 if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT) == -1)
djm@openbsd.org0a843d92018-12-27 03:25:24 +0000309 return -1;
310
311 /* Completed or failed */
312 if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) {
313 debug("getsockopt: %s", strerror(errno));
314 return -1;
315 }
316 if (optval != 0) {
317 errno = optval;
318 return -1;
319 }
320 unset_nonblock(sockfd);
321 return 0;
322}
323
Damien Miller61c51502000-08-18 14:01:04 +1000324/* Characters considered whitespace in strsep calls. */
325#define WHITESPACE " \t\r\n"
Damien Miller306d1182006-03-15 12:05:59 +1100326#define QUOTE "\""
Damien Miller61c51502000-08-18 14:01:04 +1000327
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000328/* return next token in configuration line */
djm@openbsd.org7082bb52018-06-09 03:01:12 +0000329static char *
330strdelim_internal(char **s, int split_equals)
Damien Miller61c51502000-08-18 14:01:04 +1000331{
djm@openbsd.orgc7c458e2018-03-07 23:53:08 +0000332 char *old;
Damien Miller61c51502000-08-18 14:01:04 +1000333 int wspace = 0;
334
335 if (*s == NULL)
336 return NULL;
337
338 old = *s;
339
djm@openbsd.org7082bb52018-06-09 03:01:12 +0000340 *s = strpbrk(*s,
341 split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE);
Damien Miller61c51502000-08-18 14:01:04 +1000342 if (*s == NULL)
343 return (old);
344
Damien Miller306d1182006-03-15 12:05:59 +1100345 if (*s[0] == '\"') {
346 memmove(*s, *s + 1, strlen(*s)); /* move nul too */
347 /* Find matching quote */
djm@openbsd.orgc7c458e2018-03-07 23:53:08 +0000348 if ((*s = strpbrk(*s, QUOTE)) == NULL) {
349 return (NULL); /* no matching quote */
350 } else {
351 *s[0] = '\0';
352 *s += strspn(*s + 1, WHITESPACE) + 1;
353 return (old);
Damien Miller306d1182006-03-15 12:05:59 +1100354 }
355 }
356
Damien Miller61c51502000-08-18 14:01:04 +1000357 /* Allow only one '=' to be skipped */
djm@openbsd.org7082bb52018-06-09 03:01:12 +0000358 if (split_equals && *s[0] == '=')
Damien Miller61c51502000-08-18 14:01:04 +1000359 wspace = 1;
360 *s[0] = '\0';
361
Damien Miller306d1182006-03-15 12:05:59 +1100362 /* Skip any extra whitespace after first token */
Damien Miller61c51502000-08-18 14:01:04 +1000363 *s += strspn(*s + 1, WHITESPACE) + 1;
djm@openbsd.org7082bb52018-06-09 03:01:12 +0000364 if (split_equals && *s[0] == '=' && !wspace)
Damien Miller61c51502000-08-18 14:01:04 +1000365 *s += strspn(*s + 1, WHITESPACE) + 1;
366
367 return (old);
368}
Kevin Stevesb6e773a2001-02-04 13:20:36 +0000369
djm@openbsd.org7082bb52018-06-09 03:01:12 +0000370/*
371 * Return next token in configuration line; splts on whitespace or a
372 * single '=' character.
373 */
374char *
375strdelim(char **s)
376{
377 return strdelim_internal(s, 1);
378}
379
380/*
381 * Return next token in configuration line; splts on whitespace only.
382 */
383char *
384strdelimw(char **s)
385{
386 return strdelim_internal(s, 0);
387}
388
Ben Lindstrom086cf212001-03-05 05:56:40 +0000389struct passwd *
390pwcopy(struct passwd *pw)
391{
Damien Miller07d86be2006-03-26 14:19:21 +1100392 struct passwd *copy = xcalloc(1, sizeof(*copy));
Ben Lindstrom40304422001-03-05 06:22:01 +0000393
Ben Lindstrom086cf212001-03-05 05:56:40 +0000394 copy->pw_name = xstrdup(pw->pw_name);
395 copy->pw_passwd = xstrdup(pw->pw_passwd);
Damien Miller6332da22013-04-23 14:25:52 +1000396#ifdef HAVE_STRUCT_PASSWD_PW_GECOS
Ben Lindstrom40304422001-03-05 06:22:01 +0000397 copy->pw_gecos = xstrdup(pw->pw_gecos);
Damien Miller6332da22013-04-23 14:25:52 +1000398#endif
Ben Lindstrom086cf212001-03-05 05:56:40 +0000399 copy->pw_uid = pw->pw_uid;
400 copy->pw_gid = pw->pw_gid;
Damien Miller6332da22013-04-23 14:25:52 +1000401#ifdef HAVE_STRUCT_PASSWD_PW_EXPIRE
Ben Lindstrom3af4d462001-06-21 03:11:27 +0000402 copy->pw_expire = pw->pw_expire;
Kevin Steves82456952001-06-22 21:14:18 +0000403#endif
Damien Miller6332da22013-04-23 14:25:52 +1000404#ifdef HAVE_STRUCT_PASSWD_PW_CHANGE
Ben Lindstrom3af4d462001-06-21 03:11:27 +0000405 copy->pw_change = pw->pw_change;
Kevin Steves82456952001-06-22 21:14:18 +0000406#endif
Damien Miller6332da22013-04-23 14:25:52 +1000407#ifdef HAVE_STRUCT_PASSWD_PW_CLASS
Ben Lindstrom086cf212001-03-05 05:56:40 +0000408 copy->pw_class = xstrdup(pw->pw_class);
Ben Lindstrom0f68db42001-03-05 07:57:09 +0000409#endif
Ben Lindstrom086cf212001-03-05 05:56:40 +0000410 copy->pw_dir = xstrdup(pw->pw_dir);
411 copy->pw_shell = xstrdup(pw->pw_shell);
412 return copy;
413}
414
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000415/*
416 * Convert ASCII string to TCP/IP port number.
Damien Miller3dc71ad2009-01-28 16:31:22 +1100417 * Port must be >=0 and <=65535.
418 * Return -1 if invalid.
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000419 */
420int
421a2port(const char *s)
Ben Lindstrom19066a12001-04-12 23:39:26 +0000422{
naddy@openbsd.org25813332018-10-05 14:26:09 +0000423 struct servent *se;
Damien Miller3dc71ad2009-01-28 16:31:22 +1100424 long long port;
425 const char *errstr;
Ben Lindstrom19066a12001-04-12 23:39:26 +0000426
Damien Miller3dc71ad2009-01-28 16:31:22 +1100427 port = strtonum(s, 0, 65535, &errstr);
naddy@openbsd.org25813332018-10-05 14:26:09 +0000428 if (errstr == NULL)
429 return (int)port;
430 if ((se = getservbyname(s, "tcp")) != NULL)
431 return ntohs(se->s_port);
432 return -1;
Ben Lindstrom19066a12001-04-12 23:39:26 +0000433}
434
Damien Millerd27b9472005-12-13 19:29:02 +1100435int
436a2tun(const char *s, int *remote)
437{
438 const char *errstr = NULL;
439 char *sp, *ep;
440 int tun;
441
442 if (remote != NULL) {
Damien Miller7b58e802005-12-13 19:33:19 +1100443 *remote = SSH_TUNID_ANY;
Damien Millerd27b9472005-12-13 19:29:02 +1100444 sp = xstrdup(s);
445 if ((ep = strchr(sp, ':')) == NULL) {
Darren Tuckera627d422013-06-02 07:31:17 +1000446 free(sp);
Damien Millerd27b9472005-12-13 19:29:02 +1100447 return (a2tun(s, NULL));
448 }
449 ep[0] = '\0'; ep++;
450 *remote = a2tun(ep, NULL);
451 tun = a2tun(sp, NULL);
Darren Tuckera627d422013-06-02 07:31:17 +1000452 free(sp);
Damien Miller7b58e802005-12-13 19:33:19 +1100453 return (*remote == SSH_TUNID_ERR ? *remote : tun);
Damien Millerd27b9472005-12-13 19:29:02 +1100454 }
455
456 if (strcasecmp(s, "any") == 0)
Damien Miller7b58e802005-12-13 19:33:19 +1100457 return (SSH_TUNID_ANY);
Damien Millerd27b9472005-12-13 19:29:02 +1100458
Damien Miller7b58e802005-12-13 19:33:19 +1100459 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
460 if (errstr != NULL)
461 return (SSH_TUNID_ERR);
Damien Millerd27b9472005-12-13 19:29:02 +1100462
463 return (tun);
464}
465
Ben Lindstrom1bda4c82001-06-05 19:59:08 +0000466#define SECONDS 1
467#define MINUTES (SECONDS * 60)
468#define HOURS (MINUTES * 60)
469#define DAYS (HOURS * 24)
470#define WEEKS (DAYS * 7)
471
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000472/*
473 * Convert a time string into seconds; format is
474 * a sequence of:
475 * time[qualifier]
476 *
477 * Valid time qualifiers are:
478 * <none> seconds
479 * s|S seconds
480 * m|M minutes
481 * h|H hours
482 * d|D days
483 * w|W weeks
484 *
485 * Examples:
486 * 90m 90 minutes
487 * 1h30m 90 minutes
488 * 2d 2 days
489 * 1w 1 week
490 *
491 * Return -1 if time string is invalid.
492 */
493long
494convtime(const char *s)
Ben Lindstrom1bda4c82001-06-05 19:59:08 +0000495{
dtucker@openbsd.orgf5746b42017-03-14 00:25:03 +0000496 long total, secs, multiplier = 1;
Ben Lindstrom1bda4c82001-06-05 19:59:08 +0000497 const char *p;
498 char *endp;
499
500 errno = 0;
501 total = 0;
502 p = s;
503
504 if (p == NULL || *p == '\0')
505 return -1;
506
507 while (*p) {
508 secs = strtol(p, &endp, 10);
509 if (p == endp ||
510 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
511 secs < 0)
512 return -1;
513
514 switch (*endp++) {
515 case '\0':
516 endp--;
Damien Miller69b72032006-03-26 14:02:35 +1100517 break;
Ben Lindstrom1bda4c82001-06-05 19:59:08 +0000518 case 's':
519 case 'S':
520 break;
521 case 'm':
522 case 'M':
dtucker@openbsd.orgf5746b42017-03-14 00:25:03 +0000523 multiplier = MINUTES;
Ben Lindstrom1bda4c82001-06-05 19:59:08 +0000524 break;
525 case 'h':
526 case 'H':
dtucker@openbsd.orgf5746b42017-03-14 00:25:03 +0000527 multiplier = HOURS;
Ben Lindstrom1bda4c82001-06-05 19:59:08 +0000528 break;
529 case 'd':
530 case 'D':
dtucker@openbsd.orgf5746b42017-03-14 00:25:03 +0000531 multiplier = DAYS;
Ben Lindstrom1bda4c82001-06-05 19:59:08 +0000532 break;
533 case 'w':
534 case 'W':
dtucker@openbsd.orgf5746b42017-03-14 00:25:03 +0000535 multiplier = WEEKS;
Ben Lindstrom1bda4c82001-06-05 19:59:08 +0000536 break;
537 default:
538 return -1;
539 }
dtucker@openbsd.orgc6774d22017-03-14 00:55:37 +0000540 if (secs >= LONG_MAX / multiplier)
dtucker@openbsd.orgf5746b42017-03-14 00:25:03 +0000541 return -1;
542 secs *= multiplier;
dtucker@openbsd.orgc6774d22017-03-14 00:55:37 +0000543 if (total >= LONG_MAX - secs)
dtucker@openbsd.orgf5746b42017-03-14 00:25:03 +0000544 return -1;
Ben Lindstrom1bda4c82001-06-05 19:59:08 +0000545 total += secs;
546 if (total < 0)
547 return -1;
548 p = endp;
549 }
550
551 return total;
552}
553
Damien Millerf91ee4c2005-03-01 21:24:33 +1100554/*
Darren Tuckerda345532006-07-10 23:04:19 +1000555 * Returns a standardized host+port identifier string.
556 * Caller must free returned string.
557 */
558char *
559put_host_port(const char *host, u_short port)
560{
561 char *hoststr;
562
563 if (port == 0 || port == SSH_DEFAULT_PORT)
564 return(xstrdup(host));
deraadt@openbsd.org5cdbaa72019-06-27 18:03:37 +0000565 if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1)
Darren Tuckerda345532006-07-10 23:04:19 +1000566 fatal("put_host_port: asprintf: %s", strerror(errno));
567 debug3("put_host_port: %s", hoststr);
568 return hoststr;
569}
570
571/*
Damien Millerf91ee4c2005-03-01 21:24:33 +1100572 * Search for next delimiter between hostnames/addresses and ports.
573 * Argument may be modified (for termination).
574 * Returns *cp if parsing succeeds.
millert@openbsd.org887669e2017-10-21 23:06:24 +0000575 * *cp is set to the start of the next field, if one was found.
576 * The delimiter char, if present, is stored in delim.
Damien Millerf91ee4c2005-03-01 21:24:33 +1100577 * If this is the last field, *cp is set to NULL.
578 */
dtucker@openbsd.orgd05ea252019-01-23 21:50:56 +0000579char *
millert@openbsd.org887669e2017-10-21 23:06:24 +0000580hpdelim2(char **cp, char *delim)
Damien Millerf91ee4c2005-03-01 21:24:33 +1100581{
582 char *s, *old;
583
584 if (cp == NULL || *cp == NULL)
585 return NULL;
586
587 old = s = *cp;
588 if (*s == '[') {
589 if ((s = strchr(s, ']')) == NULL)
590 return NULL;
591 else
592 s++;
593 } else if ((s = strpbrk(s, ":/")) == NULL)
594 s = *cp + strlen(*cp); /* skip to end (see first case below) */
595
596 switch (*s) {
597 case '\0':
598 *cp = NULL; /* no more fields*/
599 break;
Darren Tucker47eede72005-03-14 23:08:12 +1100600
Damien Millerf91ee4c2005-03-01 21:24:33 +1100601 case ':':
602 case '/':
millert@openbsd.org887669e2017-10-21 23:06:24 +0000603 if (delim != NULL)
604 *delim = *s;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100605 *s = '\0'; /* terminate */
606 *cp = s + 1;
607 break;
Darren Tucker47eede72005-03-14 23:08:12 +1100608
Damien Millerf91ee4c2005-03-01 21:24:33 +1100609 default:
610 return NULL;
611 }
612
613 return old;
614}
615
Ben Lindstrom4529b702001-05-03 23:39:53 +0000616char *
millert@openbsd.org887669e2017-10-21 23:06:24 +0000617hpdelim(char **cp)
618{
619 return hpdelim2(cp, NULL);
620}
621
622char *
Ben Lindstrom4529b702001-05-03 23:39:53 +0000623cleanhostname(char *host)
624{
625 if (*host == '[' && host[strlen(host) - 1] == ']') {
626 host[strlen(host) - 1] = '\0';
627 return (host + 1);
628 } else
629 return host;
630}
631
632char *
633colon(char *cp)
634{
635 int flag = 0;
636
637 if (*cp == ':') /* Leading colon is part of file name. */
Damien Miller2e774462010-06-26 09:30:47 +1000638 return NULL;
Ben Lindstrom4529b702001-05-03 23:39:53 +0000639 if (*cp == '[')
640 flag = 1;
641
642 for (; *cp; ++cp) {
643 if (*cp == '@' && *(cp+1) == '[')
644 flag = 1;
645 if (*cp == ']' && *(cp+1) == ':' && flag)
646 return (cp+1);
647 if (*cp == ':' && !flag)
648 return (cp);
649 if (*cp == '/')
Damien Miller2e774462010-06-26 09:30:47 +1000650 return NULL;
Ben Lindstrom4529b702001-05-03 23:39:53 +0000651 }
Damien Miller2e774462010-06-26 09:30:47 +1000652 return NULL;
Ben Lindstrom4529b702001-05-03 23:39:53 +0000653}
654
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000655/*
millert@openbsd.org887669e2017-10-21 23:06:24 +0000656 * Parse a [user@]host:[path] string.
657 * Caller must free returned user, host and path.
658 * Any of the pointer return arguments may be NULL (useful for syntax checking).
659 * If user was not specified then *userp will be set to NULL.
660 * If host was not specified then *hostp will be set to NULL.
661 * If path was not specified then *pathp will be set to ".".
662 * Returns 0 on success, -1 on failure.
663 */
664int
665parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
666{
667 char *user = NULL, *host = NULL, *path = NULL;
668 char *sdup, *tmp;
669 int ret = -1;
670
671 if (userp != NULL)
672 *userp = NULL;
673 if (hostp != NULL)
674 *hostp = NULL;
675 if (pathp != NULL)
676 *pathp = NULL;
677
millert@openbsd.orgb9903ee2017-10-24 19:41:45 +0000678 sdup = xstrdup(s);
millert@openbsd.org887669e2017-10-21 23:06:24 +0000679
680 /* Check for remote syntax: [user@]host:[path] */
681 if ((tmp = colon(sdup)) == NULL)
682 goto out;
683
684 /* Extract optional path */
685 *tmp++ = '\0';
686 if (*tmp == '\0')
687 tmp = ".";
688 path = xstrdup(tmp);
689
690 /* Extract optional user and mandatory host */
691 tmp = strrchr(sdup, '@');
692 if (tmp != NULL) {
693 *tmp++ = '\0';
694 host = xstrdup(cleanhostname(tmp));
695 if (*sdup != '\0')
696 user = xstrdup(sdup);
697 } else {
698 host = xstrdup(cleanhostname(sdup));
699 user = NULL;
700 }
701
702 /* Success */
703 if (userp != NULL) {
704 *userp = user;
705 user = NULL;
706 }
707 if (hostp != NULL) {
708 *hostp = host;
709 host = NULL;
millert@openbsd.orgb9903ee2017-10-24 19:41:45 +0000710 }
millert@openbsd.org887669e2017-10-21 23:06:24 +0000711 if (pathp != NULL) {
712 *pathp = path;
713 path = NULL;
millert@openbsd.orgb9903ee2017-10-24 19:41:45 +0000714 }
millert@openbsd.org887669e2017-10-21 23:06:24 +0000715 ret = 0;
716out:
717 free(sdup);
718 free(user);
719 free(host);
720 free(path);
721 return ret;
722}
723
724/*
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000725 * Parse a [user@]host[:port] string.
726 * Caller must free returned user and host.
727 * Any of the pointer return arguments may be NULL (useful for syntax checking).
728 * If user was not specified then *userp will be set to NULL.
729 * If port was not specified then *portp will be -1.
730 * Returns 0 on success, -1 on failure.
731 */
732int
733parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
734{
735 char *sdup, *cp, *tmp;
736 char *user = NULL, *host = NULL;
737 int port = -1, ret = -1;
738
739 if (userp != NULL)
740 *userp = NULL;
741 if (hostp != NULL)
742 *hostp = NULL;
743 if (portp != NULL)
744 *portp = -1;
745
746 if ((sdup = tmp = strdup(s)) == NULL)
747 return -1;
748 /* Extract optional username */
millert@openbsd.org887669e2017-10-21 23:06:24 +0000749 if ((cp = strrchr(tmp, '@')) != NULL) {
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000750 *cp = '\0';
751 if (*tmp == '\0')
752 goto out;
753 if ((user = strdup(tmp)) == NULL)
754 goto out;
755 tmp = cp + 1;
756 }
757 /* Extract mandatory hostname */
758 if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
759 goto out;
760 host = xstrdup(cleanhostname(cp));
761 /* Convert and verify optional port */
762 if (tmp != NULL && *tmp != '\0') {
763 if ((port = a2port(tmp)) <= 0)
764 goto out;
765 }
766 /* Success */
767 if (userp != NULL) {
768 *userp = user;
769 user = NULL;
770 }
771 if (hostp != NULL) {
772 *hostp = host;
773 host = NULL;
774 }
775 if (portp != NULL)
776 *portp = port;
777 ret = 0;
778 out:
779 free(sdup);
780 free(user);
781 free(host);
782 return ret;
783}
784
millert@openbsd.org887669e2017-10-21 23:06:24 +0000785/*
786 * Converts a two-byte hex string to decimal.
787 * Returns the decimal value or -1 for invalid input.
788 */
789static int
790hexchar(const char *s)
791{
792 unsigned char result[2];
793 int i;
794
795 for (i = 0; i < 2; i++) {
796 if (s[i] >= '0' && s[i] <= '9')
797 result[i] = (unsigned char)(s[i] - '0');
798 else if (s[i] >= 'a' && s[i] <= 'f')
799 result[i] = (unsigned char)(s[i] - 'a') + 10;
800 else if (s[i] >= 'A' && s[i] <= 'F')
801 result[i] = (unsigned char)(s[i] - 'A') + 10;
802 else
803 return -1;
804 }
805 return (result[0] << 4) | result[1];
806}
807
808/*
809 * Decode an url-encoded string.
810 * Returns a newly allocated string on success or NULL on failure.
811 */
812static char *
813urldecode(const char *src)
814{
815 char *ret, *dst;
816 int ch;
817
818 ret = xmalloc(strlen(src) + 1);
819 for (dst = ret; *src != '\0'; src++) {
820 switch (*src) {
821 case '+':
822 *dst++ = ' ';
823 break;
824 case '%':
825 if (!isxdigit((unsigned char)src[1]) ||
826 !isxdigit((unsigned char)src[2]) ||
827 (ch = hexchar(src + 1)) == -1) {
828 free(ret);
829 return NULL;
830 }
831 *dst++ = ch;
832 src += 2;
833 break;
834 default:
835 *dst++ = *src;
836 break;
837 }
838 }
839 *dst = '\0';
840
841 return ret;
842}
843
844/*
845 * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
846 * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
847 * Either user or path may be url-encoded (but not host or port).
848 * Caller must free returned user, host and path.
849 * Any of the pointer return arguments may be NULL (useful for syntax checking)
850 * but the scheme must always be specified.
851 * If user was not specified then *userp will be set to NULL.
852 * If port was not specified then *portp will be -1.
853 * If path was not specified then *pathp will be set to NULL.
854 * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
855 */
856int
857parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
858 int *portp, char **pathp)
859{
860 char *uridup, *cp, *tmp, ch;
861 char *user = NULL, *host = NULL, *path = NULL;
862 int port = -1, ret = -1;
863 size_t len;
864
865 len = strlen(scheme);
866 if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
867 return 1;
868 uri += len + 3;
869
870 if (userp != NULL)
871 *userp = NULL;
872 if (hostp != NULL)
873 *hostp = NULL;
874 if (portp != NULL)
875 *portp = -1;
876 if (pathp != NULL)
877 *pathp = NULL;
878
879 uridup = tmp = xstrdup(uri);
880
881 /* Extract optional ssh-info (username + connection params) */
882 if ((cp = strchr(tmp, '@')) != NULL) {
883 char *delim;
884
885 *cp = '\0';
886 /* Extract username and connection params */
887 if ((delim = strchr(tmp, ';')) != NULL) {
888 /* Just ignore connection params for now */
889 *delim = '\0';
890 }
891 if (*tmp == '\0') {
892 /* Empty username */
893 goto out;
894 }
895 if ((user = urldecode(tmp)) == NULL)
896 goto out;
897 tmp = cp + 1;
898 }
899
900 /* Extract mandatory hostname */
901 if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
902 goto out;
903 host = xstrdup(cleanhostname(cp));
904 if (!valid_domain(host, 0, NULL))
905 goto out;
906
907 if (tmp != NULL && *tmp != '\0') {
908 if (ch == ':') {
909 /* Convert and verify port. */
910 if ((cp = strchr(tmp, '/')) != NULL)
911 *cp = '\0';
912 if ((port = a2port(tmp)) <= 0)
913 goto out;
914 tmp = cp ? cp + 1 : NULL;
915 }
916 if (tmp != NULL && *tmp != '\0') {
917 /* Extract optional path */
918 if ((path = urldecode(tmp)) == NULL)
919 goto out;
920 }
921 }
922
923 /* Success */
924 if (userp != NULL) {
925 *userp = user;
926 user = NULL;
927 }
928 if (hostp != NULL) {
929 *hostp = host;
930 host = NULL;
931 }
932 if (portp != NULL)
933 *portp = port;
934 if (pathp != NULL) {
935 *pathp = path;
936 path = NULL;
937 }
938 ret = 0;
939 out:
940 free(uridup);
941 free(user);
942 free(host);
943 free(path);
944 return ret;
945}
946
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000947/* function to assist building execv() arguments */
Ben Lindstrom387c4722001-05-08 20:27:25 +0000948void
949addargs(arglist *args, char *fmt, ...)
950{
951 va_list ap;
Damien Miller3eec6b72006-01-31 21:49:27 +1100952 char *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000953 u_int nalloc;
Damien Miller3eec6b72006-01-31 21:49:27 +1100954 int r;
Ben Lindstrom387c4722001-05-08 20:27:25 +0000955
956 va_start(ap, fmt);
Damien Miller3eec6b72006-01-31 21:49:27 +1100957 r = vasprintf(&cp, fmt, ap);
Ben Lindstrom387c4722001-05-08 20:27:25 +0000958 va_end(ap);
Damien Miller3eec6b72006-01-31 21:49:27 +1100959 if (r == -1)
960 fatal("addargs: argument too long");
Ben Lindstrom387c4722001-05-08 20:27:25 +0000961
Darren Tuckerfb16b242003-09-22 21:04:23 +1000962 nalloc = args->nalloc;
Ben Lindstrom387c4722001-05-08 20:27:25 +0000963 if (args->list == NULL) {
Darren Tuckerfb16b242003-09-22 21:04:23 +1000964 nalloc = 32;
Ben Lindstrom387c4722001-05-08 20:27:25 +0000965 args->num = 0;
Darren Tuckerfb16b242003-09-22 21:04:23 +1000966 } else if (args->num+2 >= nalloc)
967 nalloc *= 2;
Ben Lindstrom387c4722001-05-08 20:27:25 +0000968
deraadt@openbsd.org9e509d42017-05-31 09:15:42 +0000969 args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *));
Darren Tuckerfb16b242003-09-22 21:04:23 +1000970 args->nalloc = nalloc;
Damien Miller3eec6b72006-01-31 21:49:27 +1100971 args->list[args->num++] = cp;
Ben Lindstrom387c4722001-05-08 20:27:25 +0000972 args->list[args->num] = NULL;
973}
Darren Tucker22cc7412004-12-06 22:47:41 +1100974
Damien Miller3eec6b72006-01-31 21:49:27 +1100975void
976replacearg(arglist *args, u_int which, char *fmt, ...)
977{
978 va_list ap;
979 char *cp;
980 int r;
981
982 va_start(ap, fmt);
983 r = vasprintf(&cp, fmt, ap);
984 va_end(ap);
985 if (r == -1)
986 fatal("replacearg: argument too long");
987
988 if (which >= args->num)
989 fatal("replacearg: tried to replace invalid arg %d >= %d",
990 which, args->num);
Darren Tuckera627d422013-06-02 07:31:17 +1000991 free(args->list[which]);
Damien Miller3eec6b72006-01-31 21:49:27 +1100992 args->list[which] = cp;
993}
994
995void
996freeargs(arglist *args)
997{
998 u_int i;
999
1000 if (args->list != NULL) {
1001 for (i = 0; i < args->num; i++)
Darren Tuckera627d422013-06-02 07:31:17 +10001002 free(args->list[i]);
1003 free(args->list);
Damien Miller3eec6b72006-01-31 21:49:27 +11001004 args->nalloc = args->num = 0;
1005 args->list = NULL;
1006 }
1007}
1008
Darren Tucker22cc7412004-12-06 22:47:41 +11001009/*
Damien Miller5fd38c02005-05-26 12:02:14 +10001010 * Expands tildes in the file name. Returns data allocated by xmalloc.
1011 * Warning: this calls getpw*.
1012 */
1013char *
1014tilde_expand_filename(const char *filename, uid_t uid)
1015{
Darren Tucker2ca51bf2013-05-16 20:22:46 +10001016 const char *path, *sep;
1017 char user[128], *ret;
Damien Miller5fd38c02005-05-26 12:02:14 +10001018 struct passwd *pw;
Damien Millereccb9de2005-06-17 12:59:34 +10001019 u_int len, slash;
Damien Miller5fd38c02005-05-26 12:02:14 +10001020
1021 if (*filename != '~')
1022 return (xstrdup(filename));
1023 filename++;
1024
1025 path = strchr(filename, '/');
1026 if (path != NULL && path > filename) { /* ~user/path */
Damien Millereccb9de2005-06-17 12:59:34 +10001027 slash = path - filename;
1028 if (slash > sizeof(user) - 1)
Damien Miller5fd38c02005-05-26 12:02:14 +10001029 fatal("tilde_expand_filename: ~username too long");
Damien Millereccb9de2005-06-17 12:59:34 +10001030 memcpy(user, filename, slash);
1031 user[slash] = '\0';
Damien Miller5fd38c02005-05-26 12:02:14 +10001032 if ((pw = getpwnam(user)) == NULL)
1033 fatal("tilde_expand_filename: No such user %s", user);
1034 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
Darren Tucker7517b5b2008-06-13 14:48:59 +10001035 fatal("tilde_expand_filename: No such uid %ld", (long)uid);
Damien Miller5fd38c02005-05-26 12:02:14 +10001036
Damien Miller5fd38c02005-05-26 12:02:14 +10001037 /* Make sure directory has a trailing '/' */
1038 len = strlen(pw->pw_dir);
Darren Tucker026d9db2013-05-16 20:23:52 +10001039 if (len == 0 || pw->pw_dir[len - 1] != '/')
Darren Tucker2ca51bf2013-05-16 20:22:46 +10001040 sep = "/";
1041 else
1042 sep = "";
Damien Miller5fd38c02005-05-26 12:02:14 +10001043
1044 /* Skip leading '/' from specified path */
1045 if (path != NULL)
1046 filename = path + 1;
Darren Tucker2ca51bf2013-05-16 20:22:46 +10001047
deraadt@openbsd.org2ae4f332015-01-16 06:40:12 +00001048 if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX)
Damien Miller5fd38c02005-05-26 12:02:14 +10001049 fatal("tilde_expand_filename: Path too long");
1050
Darren Tucker2ca51bf2013-05-16 20:22:46 +10001051 return (ret);
Damien Miller5fd38c02005-05-26 12:02:14 +10001052}
1053
1054/*
Damien Miller6476cad2005-06-16 13:18:34 +10001055 * Expand a string with a set of %[char] escapes. A number of escapes may be
1056 * specified as (char *escape_chars, char *replacement) pairs. The list must
Darren Tuckerbee73d52005-07-14 17:05:02 +10001057 * be terminated by a NULL escape_char. Returns replaced string in memory
Damien Miller6476cad2005-06-16 13:18:34 +10001058 * allocated by xmalloc.
1059 */
1060char *
1061percent_expand(const char *string, ...)
1062{
1063#define EXPAND_MAX_KEYS 16
djm@openbsd.orge3b6c962019-08-16 06:13:15 +00001064 u_int num_keys, i;
Damien Miller6476cad2005-06-16 13:18:34 +10001065 struct {
1066 const char *key;
1067 const char *repl;
1068 } keys[EXPAND_MAX_KEYS];
djm@openbsd.orge3b6c962019-08-16 06:13:15 +00001069 struct sshbuf *buf;
Damien Miller6476cad2005-06-16 13:18:34 +10001070 va_list ap;
djm@openbsd.orge3b6c962019-08-16 06:13:15 +00001071 int r;
1072 char *ret;
1073
1074 if ((buf = sshbuf_new()) == NULL)
1075 fatal("%s: sshbuf_new failed", __func__);
Damien Miller6476cad2005-06-16 13:18:34 +10001076
1077 /* Gather keys */
1078 va_start(ap, string);
1079 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
1080 keys[num_keys].key = va_arg(ap, char *);
1081 if (keys[num_keys].key == NULL)
1082 break;
1083 keys[num_keys].repl = va_arg(ap, char *);
1084 if (keys[num_keys].repl == NULL)
Darren Tucker70d87692010-01-08 18:49:16 +11001085 fatal("%s: NULL replacement", __func__);
Damien Miller6476cad2005-06-16 13:18:34 +10001086 }
Darren Tucker70d87692010-01-08 18:49:16 +11001087 if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
1088 fatal("%s: too many keys", __func__);
Damien Miller6476cad2005-06-16 13:18:34 +10001089 va_end(ap);
1090
Damien Miller6476cad2005-06-16 13:18:34 +10001091 /* Expand string */
Damien Miller6476cad2005-06-16 13:18:34 +10001092 for (i = 0; *string != '\0'; string++) {
1093 if (*string != '%') {
1094 append:
djm@openbsd.orge3b6c962019-08-16 06:13:15 +00001095 if ((r = sshbuf_put_u8(buf, *string)) != 0) {
1096 fatal("%s: sshbuf_put_u8: %s",
1097 __func__, ssh_err(r));
1098 }
Damien Miller6476cad2005-06-16 13:18:34 +10001099 continue;
1100 }
1101 string++;
Darren Tucker70d87692010-01-08 18:49:16 +11001102 /* %% case */
Damien Miller6476cad2005-06-16 13:18:34 +10001103 if (*string == '%')
1104 goto append;
tobias@openbsd.org8b56e592015-12-04 21:51:06 +00001105 if (*string == '\0')
1106 fatal("%s: invalid format", __func__);
djm@openbsd.orge3b6c962019-08-16 06:13:15 +00001107 for (i = 0; i < num_keys; i++) {
1108 if (strchr(keys[i].key, *string) != NULL) {
1109 if ((r = sshbuf_put(buf, keys[i].repl,
1110 strlen(keys[i].repl))) != 0) {
1111 fatal("%s: sshbuf_put: %s",
1112 __func__, ssh_err(r));
1113 }
Damien Miller6476cad2005-06-16 13:18:34 +10001114 break;
1115 }
1116 }
djm@openbsd.orge3b6c962019-08-16 06:13:15 +00001117 if (i >= num_keys)
Darren Tucker70d87692010-01-08 18:49:16 +11001118 fatal("%s: unknown key %%%c", __func__, *string);
Damien Miller6476cad2005-06-16 13:18:34 +10001119 }
djm@openbsd.orge3b6c962019-08-16 06:13:15 +00001120 if ((ret = sshbuf_dup_string(buf)) == NULL)
1121 fatal("%s: sshbuf_dup_string failed", __func__);
1122 sshbuf_free(buf);
1123 return ret;
Damien Miller6476cad2005-06-16 13:18:34 +10001124#undef EXPAND_MAX_KEYS
1125}
1126
Damien Millerd27b9472005-12-13 19:29:02 +11001127int
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001128tun_open(int tun, int mode, char **ifname)
Damien Millerd27b9472005-12-13 19:29:02 +11001129{
Damien Miller62a31c92005-12-13 20:44:13 +11001130#if defined(CUSTOM_SYS_TUN_OPEN)
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001131 return (sys_tun_open(tun, mode, ifname));
Damien Miller2dcddbf2006-01-01 19:47:05 +11001132#elif defined(SSH_TUN_OPENBSD)
Damien Miller7b58e802005-12-13 19:33:19 +11001133 struct ifreq ifr;
Damien Millerd27b9472005-12-13 19:29:02 +11001134 char name[100];
Damien Miller7b58e802005-12-13 19:33:19 +11001135 int fd = -1, sock;
sthen@openbsd.orga820a862015-10-24 08:34:09 +00001136 const char *tunbase = "tun";
1137
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001138 if (ifname != NULL)
1139 *ifname = NULL;
1140
sthen@openbsd.orga820a862015-10-24 08:34:09 +00001141 if (mode == SSH_TUNMODE_ETHERNET)
1142 tunbase = "tap";
Damien Millerd27b9472005-12-13 19:29:02 +11001143
Damien Miller7b58e802005-12-13 19:33:19 +11001144 /* Open the tunnel device */
1145 if (tun <= SSH_TUNID_MAX) {
sthen@openbsd.orga820a862015-10-24 08:34:09 +00001146 snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
Damien Miller7b58e802005-12-13 19:33:19 +11001147 fd = open(name, O_RDWR);
1148 } else if (tun == SSH_TUNID_ANY) {
1149 for (tun = 100; tun >= 0; tun--) {
sthen@openbsd.orga820a862015-10-24 08:34:09 +00001150 snprintf(name, sizeof(name), "/dev/%s%d",
1151 tunbase, tun);
Damien Miller7b58e802005-12-13 19:33:19 +11001152 if ((fd = open(name, O_RDWR)) >= 0)
1153 break;
Damien Millerd27b9472005-12-13 19:29:02 +11001154 }
1155 } else {
Damien Millera210d522006-01-02 23:40:30 +11001156 debug("%s: invalid tunnel %u", __func__, tun);
djm@openbsd.org2905d6f2015-10-07 00:54:06 +00001157 return -1;
Damien Millerd27b9472005-12-13 19:29:02 +11001158 }
Damien Miller7b58e802005-12-13 19:33:19 +11001159
deraadt@openbsd.org4d28fa72019-06-28 13:35:04 +00001160 if (fd == -1) {
djm@openbsd.org2905d6f2015-10-07 00:54:06 +00001161 debug("%s: %s open: %s", __func__, name, strerror(errno));
1162 return -1;
Damien Miller7b58e802005-12-13 19:33:19 +11001163 }
1164
1165 debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
1166
sthen@openbsd.orga820a862015-10-24 08:34:09 +00001167 /* Bring interface up if it is not already */
1168 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
1169 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
Damien Miller7b58e802005-12-13 19:33:19 +11001170 goto failed;
1171
djm@openbsd.org2905d6f2015-10-07 00:54:06 +00001172 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
1173 debug("%s: get interface %s flags: %s", __func__,
1174 ifr.ifr_name, strerror(errno));
Damien Miller7b58e802005-12-13 19:33:19 +11001175 goto failed;
djm@openbsd.org2905d6f2015-10-07 00:54:06 +00001176 }
Damien Millera1d9a182006-01-02 23:41:21 +11001177
djm@openbsd.org2905d6f2015-10-07 00:54:06 +00001178 if (!(ifr.ifr_flags & IFF_UP)) {
1179 ifr.ifr_flags |= IFF_UP;
1180 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
1181 debug("%s: activate interface %s: %s", __func__,
1182 ifr.ifr_name, strerror(errno));
1183 goto failed;
1184 }
1185 }
Damien Miller7b58e802005-12-13 19:33:19 +11001186
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001187 if (ifname != NULL)
1188 *ifname = xstrdup(ifr.ifr_name);
1189
Damien Miller7b58e802005-12-13 19:33:19 +11001190 close(sock);
djm@openbsd.org2905d6f2015-10-07 00:54:06 +00001191 return fd;
Damien Miller7b58e802005-12-13 19:33:19 +11001192
1193 failed:
1194 if (fd >= 0)
1195 close(fd);
1196 if (sock >= 0)
1197 close(sock);
djm@openbsd.org2905d6f2015-10-07 00:54:06 +00001198 return -1;
Damien Miller62a31c92005-12-13 20:44:13 +11001199#else
1200 error("Tunnel interfaces are not supported on this platform");
1201 return (-1);
1202#endif
Damien Millerd27b9472005-12-13 19:29:02 +11001203}
1204
Darren Tuckerce321d82005-10-03 18:11:24 +10001205void
1206sanitise_stdfd(void)
1207{
Damien Miller72c5b7d2006-01-06 14:50:44 +11001208 int nullfd, dupfd;
Darren Tuckerce321d82005-10-03 18:11:24 +10001209
Damien Miller72c5b7d2006-01-06 14:50:44 +11001210 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
Damien Miller9eab9562009-02-22 08:47:02 +11001211 fprintf(stderr, "Couldn't open /dev/null: %s\n",
1212 strerror(errno));
Darren Tuckerce321d82005-10-03 18:11:24 +10001213 exit(1);
1214 }
krw@openbsd.org574def02016-04-02 14:37:42 +00001215 while (++dupfd <= STDERR_FILENO) {
1216 /* Only populate closed fds. */
1217 if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
1218 if (dup2(nullfd, dupfd) == -1) {
1219 fprintf(stderr, "dup2: %s\n", strerror(errno));
1220 exit(1);
1221 }
Darren Tuckerce321d82005-10-03 18:11:24 +10001222 }
Darren Tuckerce321d82005-10-03 18:11:24 +10001223 }
krw@openbsd.org574def02016-04-02 14:37:42 +00001224 if (nullfd > STDERR_FILENO)
Darren Tuckerce321d82005-10-03 18:11:24 +10001225 close(nullfd);
1226}
1227
Damien Miller13390022005-07-06 09:44:19 +10001228char *
Damien Miller3f941882006-03-31 23:13:02 +11001229tohex(const void *vp, size_t l)
Damien Miller13390022005-07-06 09:44:19 +10001230{
Damien Miller3f941882006-03-31 23:13:02 +11001231 const u_char *p = (const u_char *)vp;
Damien Miller13390022005-07-06 09:44:19 +10001232 char b[3], *r;
Damien Miller3f941882006-03-31 23:13:02 +11001233 size_t i, hl;
1234
1235 if (l > 65536)
1236 return xstrdup("tohex: length > 65536");
Damien Miller13390022005-07-06 09:44:19 +10001237
1238 hl = l * 2 + 1;
Damien Miller07d86be2006-03-26 14:19:21 +11001239 r = xcalloc(1, hl);
Damien Miller13390022005-07-06 09:44:19 +10001240 for (i = 0; i < l; i++) {
Damien Miller3f941882006-03-31 23:13:02 +11001241 snprintf(b, sizeof(b), "%02x", p[i]);
Damien Miller13390022005-07-06 09:44:19 +10001242 strlcat(r, b, hl);
1243 }
1244 return (r);
1245}
1246
Damien Miller3f941882006-03-31 23:13:02 +11001247u_int64_t
1248get_u64(const void *vp)
1249{
1250 const u_char *p = (const u_char *)vp;
1251 u_int64_t v;
1252
1253 v = (u_int64_t)p[0] << 56;
1254 v |= (u_int64_t)p[1] << 48;
1255 v |= (u_int64_t)p[2] << 40;
1256 v |= (u_int64_t)p[3] << 32;
1257 v |= (u_int64_t)p[4] << 24;
1258 v |= (u_int64_t)p[5] << 16;
1259 v |= (u_int64_t)p[6] << 8;
1260 v |= (u_int64_t)p[7];
1261
1262 return (v);
1263}
1264
1265u_int32_t
1266get_u32(const void *vp)
1267{
1268 const u_char *p = (const u_char *)vp;
1269 u_int32_t v;
1270
1271 v = (u_int32_t)p[0] << 24;
1272 v |= (u_int32_t)p[1] << 16;
1273 v |= (u_int32_t)p[2] << 8;
1274 v |= (u_int32_t)p[3];
1275
1276 return (v);
1277}
1278
Damien Miller88856692014-04-20 13:33:19 +10001279u_int32_t
1280get_u32_le(const void *vp)
1281{
1282 const u_char *p = (const u_char *)vp;
1283 u_int32_t v;
1284
1285 v = (u_int32_t)p[0];
1286 v |= (u_int32_t)p[1] << 8;
1287 v |= (u_int32_t)p[2] << 16;
1288 v |= (u_int32_t)p[3] << 24;
1289
1290 return (v);
1291}
1292
Damien Miller3f941882006-03-31 23:13:02 +11001293u_int16_t
1294get_u16(const void *vp)
1295{
1296 const u_char *p = (const u_char *)vp;
1297 u_int16_t v;
1298
1299 v = (u_int16_t)p[0] << 8;
1300 v |= (u_int16_t)p[1];
1301
1302 return (v);
1303}
1304
1305void
1306put_u64(void *vp, u_int64_t v)
1307{
1308 u_char *p = (u_char *)vp;
1309
1310 p[0] = (u_char)(v >> 56) & 0xff;
1311 p[1] = (u_char)(v >> 48) & 0xff;
1312 p[2] = (u_char)(v >> 40) & 0xff;
1313 p[3] = (u_char)(v >> 32) & 0xff;
1314 p[4] = (u_char)(v >> 24) & 0xff;
1315 p[5] = (u_char)(v >> 16) & 0xff;
1316 p[6] = (u_char)(v >> 8) & 0xff;
1317 p[7] = (u_char)v & 0xff;
1318}
1319
1320void
1321put_u32(void *vp, u_int32_t v)
1322{
1323 u_char *p = (u_char *)vp;
1324
1325 p[0] = (u_char)(v >> 24) & 0xff;
1326 p[1] = (u_char)(v >> 16) & 0xff;
1327 p[2] = (u_char)(v >> 8) & 0xff;
1328 p[3] = (u_char)v & 0xff;
1329}
1330
Damien Miller88856692014-04-20 13:33:19 +10001331void
1332put_u32_le(void *vp, u_int32_t v)
1333{
1334 u_char *p = (u_char *)vp;
1335
1336 p[0] = (u_char)v & 0xff;
1337 p[1] = (u_char)(v >> 8) & 0xff;
1338 p[2] = (u_char)(v >> 16) & 0xff;
1339 p[3] = (u_char)(v >> 24) & 0xff;
1340}
Damien Miller3f941882006-03-31 23:13:02 +11001341
1342void
1343put_u16(void *vp, u_int16_t v)
1344{
1345 u_char *p = (u_char *)vp;
1346
1347 p[0] = (u_char)(v >> 8) & 0xff;
1348 p[1] = (u_char)v & 0xff;
1349}
Darren Tucker3fc464e2008-06-13 06:42:45 +10001350
1351void
1352ms_subtract_diff(struct timeval *start, int *ms)
1353{
1354 struct timeval diff, finish;
1355
dtucker@openbsd.org@openbsd.org5db6fbf2017-11-25 06:46:22 +00001356 monotime_tv(&finish);
1357 timersub(&finish, start, &diff);
Darren Tucker3fc464e2008-06-13 06:42:45 +10001358 *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
1359}
1360
1361void
1362ms_to_timeval(struct timeval *tv, int ms)
1363{
1364 if (ms < 0)
1365 ms = 0;
1366 tv->tv_sec = ms / 1000;
1367 tv->tv_usec = (ms % 1000) * 1000;
1368}
1369
dtucker@openbsd.org@openbsd.org5db6fbf2017-11-25 06:46:22 +00001370void
1371monotime_ts(struct timespec *ts)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001372{
dtucker@openbsd.org@openbsd.org5db6fbf2017-11-25 06:46:22 +00001373 struct timeval tv;
1374#if defined(HAVE_CLOCK_GETTIME) && (defined(CLOCK_BOOTTIME) || \
1375 defined(CLOCK_MONOTONIC) || defined(CLOCK_REALTIME))
Darren Tucker94396b72013-08-08 11:52:37 +10001376 static int gettime_failed = 0;
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001377
Darren Tucker94396b72013-08-08 11:52:37 +10001378 if (!gettime_failed) {
dtucker@openbsd.org@openbsd.org5db6fbf2017-11-25 06:46:22 +00001379# ifdef CLOCK_BOOTTIME
1380 if (clock_gettime(CLOCK_BOOTTIME, ts) == 0)
1381 return;
1382# endif /* CLOCK_BOOTTIME */
1383# ifdef CLOCK_MONOTONIC
1384 if (clock_gettime(CLOCK_MONOTONIC, ts) == 0)
1385 return;
1386# endif /* CLOCK_MONOTONIC */
1387# ifdef CLOCK_REALTIME
1388 /* Not monotonic, but we're almost out of options here. */
1389 if (clock_gettime(CLOCK_REALTIME, ts) == 0)
1390 return;
1391# endif /* CLOCK_REALTIME */
Darren Tucker94396b72013-08-08 11:52:37 +10001392 debug3("clock_gettime: %s", strerror(errno));
1393 gettime_failed = 1;
1394 }
dtucker@openbsd.org@openbsd.org5db6fbf2017-11-25 06:46:22 +00001395#endif /* HAVE_CLOCK_GETTIME && (BOOTTIME || MONOTONIC || REALTIME) */
1396 gettimeofday(&tv, NULL);
1397 ts->tv_sec = tv.tv_sec;
1398 ts->tv_nsec = (long)tv.tv_usec * 1000;
1399}
Darren Tucker94396b72013-08-08 11:52:37 +10001400
dtucker@openbsd.org@openbsd.org5db6fbf2017-11-25 06:46:22 +00001401void
1402monotime_tv(struct timeval *tv)
1403{
1404 struct timespec ts;
1405
1406 monotime_ts(&ts);
1407 tv->tv_sec = ts.tv_sec;
1408 tv->tv_usec = ts.tv_nsec / 1000;
1409}
1410
1411time_t
1412monotime(void)
1413{
1414 struct timespec ts;
1415
1416 monotime_ts(&ts);
1417 return ts.tv_sec;
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001418}
1419
dtucker@openbsd.orgb8d4eaf2016-03-02 22:42:40 +00001420double
1421monotime_double(void)
1422{
1423 struct timespec ts;
1424
dtucker@openbsd.org@openbsd.org5db6fbf2017-11-25 06:46:22 +00001425 monotime_ts(&ts);
1426 return ts.tv_sec + ((double)ts.tv_nsec / 1000000000);
dtucker@openbsd.orgb8d4eaf2016-03-02 22:42:40 +00001427}
1428
Damien Miller65e42f82010-09-24 22:15:11 +10001429void
1430bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
1431{
1432 bw->buflen = buflen;
1433 bw->rate = kbps;
dtucker@openbsd.org434b5872018-12-07 04:36:09 +00001434 bw->thresh = buflen;
Damien Miller65e42f82010-09-24 22:15:11 +10001435 bw->lamt = 0;
1436 timerclear(&bw->bwstart);
1437 timerclear(&bw->bwend);
dtucker@openbsd.org434b5872018-12-07 04:36:09 +00001438}
Damien Miller65e42f82010-09-24 22:15:11 +10001439
1440/* Callback from read/write loop to insert bandwidth-limiting delays */
1441void
1442bandwidth_limit(struct bwlimit *bw, size_t read_len)
1443{
1444 u_int64_t waitlen;
1445 struct timespec ts, rm;
1446
dtucker@openbsd.org434b5872018-12-07 04:36:09 +00001447 bw->lamt += read_len;
Damien Miller65e42f82010-09-24 22:15:11 +10001448 if (!timerisset(&bw->bwstart)) {
dtucker@openbsd.org@openbsd.org5db6fbf2017-11-25 06:46:22 +00001449 monotime_tv(&bw->bwstart);
Damien Miller65e42f82010-09-24 22:15:11 +10001450 return;
1451 }
Damien Miller65e42f82010-09-24 22:15:11 +10001452 if (bw->lamt < bw->thresh)
1453 return;
1454
dtucker@openbsd.org@openbsd.org5db6fbf2017-11-25 06:46:22 +00001455 monotime_tv(&bw->bwend);
Damien Miller65e42f82010-09-24 22:15:11 +10001456 timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
1457 if (!timerisset(&bw->bwend))
1458 return;
1459
1460 bw->lamt *= 8;
1461 waitlen = (double)1000000L * bw->lamt / bw->rate;
1462
1463 bw->bwstart.tv_sec = waitlen / 1000000L;
1464 bw->bwstart.tv_usec = waitlen % 1000000L;
1465
1466 if (timercmp(&bw->bwstart, &bw->bwend, >)) {
1467 timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
1468
1469 /* Adjust the wait time */
1470 if (bw->bwend.tv_sec) {
1471 bw->thresh /= 2;
1472 if (bw->thresh < bw->buflen / 4)
1473 bw->thresh = bw->buflen / 4;
1474 } else if (bw->bwend.tv_usec < 10000) {
1475 bw->thresh *= 2;
1476 if (bw->thresh > bw->buflen * 8)
1477 bw->thresh = bw->buflen * 8;
1478 }
1479
1480 TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1481 while (nanosleep(&ts, &rm) == -1) {
1482 if (errno != EINTR)
1483 break;
1484 ts = rm;
1485 }
1486 }
1487
1488 bw->lamt = 0;
dtucker@openbsd.org@openbsd.org5db6fbf2017-11-25 06:46:22 +00001489 monotime_tv(&bw->bwstart);
Damien Miller65e42f82010-09-24 22:15:11 +10001490}
Damien Miller0dac6fb2010-11-20 15:19:38 +11001491
Damien Miller2cd62932010-12-01 11:50:35 +11001492/* Make a template filename for mk[sd]temp() */
1493void
1494mktemp_proto(char *s, size_t len)
1495{
1496 const char *tmpdir;
1497 int r;
1498
1499 if ((tmpdir = getenv("TMPDIR")) != NULL) {
1500 r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1501 if (r > 0 && (size_t)r < len)
1502 return;
1503 }
1504 r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1505 if (r < 0 || (size_t)r >= len)
1506 fatal("%s: template string too short", __func__);
1507}
1508
Damien Miller0dac6fb2010-11-20 15:19:38 +11001509static const struct {
1510 const char *name;
1511 int value;
1512} ipqos[] = {
djm@openbsd.org51676ec2017-07-23 23:37:02 +00001513 { "none", INT_MAX }, /* can't use 0 here; that's CS0 */
Damien Miller0dac6fb2010-11-20 15:19:38 +11001514 { "af11", IPTOS_DSCP_AF11 },
1515 { "af12", IPTOS_DSCP_AF12 },
1516 { "af13", IPTOS_DSCP_AF13 },
Damien Miller2918e032011-09-22 21:34:35 +10001517 { "af21", IPTOS_DSCP_AF21 },
Damien Miller0dac6fb2010-11-20 15:19:38 +11001518 { "af22", IPTOS_DSCP_AF22 },
1519 { "af23", IPTOS_DSCP_AF23 },
1520 { "af31", IPTOS_DSCP_AF31 },
1521 { "af32", IPTOS_DSCP_AF32 },
1522 { "af33", IPTOS_DSCP_AF33 },
1523 { "af41", IPTOS_DSCP_AF41 },
1524 { "af42", IPTOS_DSCP_AF42 },
1525 { "af43", IPTOS_DSCP_AF43 },
1526 { "cs0", IPTOS_DSCP_CS0 },
1527 { "cs1", IPTOS_DSCP_CS1 },
1528 { "cs2", IPTOS_DSCP_CS2 },
1529 { "cs3", IPTOS_DSCP_CS3 },
1530 { "cs4", IPTOS_DSCP_CS4 },
1531 { "cs5", IPTOS_DSCP_CS5 },
1532 { "cs6", IPTOS_DSCP_CS6 },
1533 { "cs7", IPTOS_DSCP_CS7 },
1534 { "ef", IPTOS_DSCP_EF },
1535 { "lowdelay", IPTOS_LOWDELAY },
1536 { "throughput", IPTOS_THROUGHPUT },
1537 { "reliability", IPTOS_RELIABILITY },
1538 { NULL, -1 }
1539};
1540
1541int
1542parse_ipqos(const char *cp)
1543{
1544 u_int i;
1545 char *ep;
1546 long val;
1547
1548 if (cp == NULL)
1549 return -1;
1550 for (i = 0; ipqos[i].name != NULL; i++) {
1551 if (strcasecmp(cp, ipqos[i].name) == 0)
1552 return ipqos[i].value;
1553 }
1554 /* Try parsing as an integer */
1555 val = strtol(cp, &ep, 0);
1556 if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1557 return -1;
1558 return val;
1559}
1560
Damien Miller91475862011-05-05 14:14:34 +10001561const char *
1562iptos2str(int iptos)
1563{
1564 int i;
1565 static char iptos_str[sizeof "0xff"];
1566
1567 for (i = 0; ipqos[i].name != NULL; i++) {
1568 if (ipqos[i].value == iptos)
1569 return ipqos[i].name;
1570 }
1571 snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1572 return iptos_str;
1573}
Damien Millere9fc72e2013-10-15 12:14:12 +11001574
1575void
1576lowercase(char *s)
1577{
1578 for (; *s; s++)
1579 *s = tolower((u_char)*s);
1580}
Damien Miller7acefbb2014-07-18 14:11:24 +10001581
1582int
1583unix_listener(const char *path, int backlog, int unlink_first)
1584{
1585 struct sockaddr_un sunaddr;
1586 int saved_errno, sock;
1587
1588 memset(&sunaddr, 0, sizeof(sunaddr));
1589 sunaddr.sun_family = AF_UNIX;
djm@openbsd.org155072f2017-12-08 02:13:02 +00001590 if (strlcpy(sunaddr.sun_path, path,
1591 sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1592 error("%s: path \"%s\" too long for Unix domain socket",
1593 __func__, path);
Damien Miller7acefbb2014-07-18 14:11:24 +10001594 errno = ENAMETOOLONG;
1595 return -1;
1596 }
1597
1598 sock = socket(PF_UNIX, SOCK_STREAM, 0);
deraadt@openbsd.org4d28fa72019-06-28 13:35:04 +00001599 if (sock == -1) {
Damien Miller7acefbb2014-07-18 14:11:24 +10001600 saved_errno = errno;
djm@openbsd.org155072f2017-12-08 02:13:02 +00001601 error("%s: socket: %.100s", __func__, strerror(errno));
Damien Miller7acefbb2014-07-18 14:11:24 +10001602 errno = saved_errno;
1603 return -1;
1604 }
1605 if (unlink_first == 1) {
1606 if (unlink(path) != 0 && errno != ENOENT)
1607 error("unlink(%s): %.100s", path, strerror(errno));
1608 }
deraadt@openbsd.org4d28fa72019-06-28 13:35:04 +00001609 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
Damien Miller7acefbb2014-07-18 14:11:24 +10001610 saved_errno = errno;
djm@openbsd.org155072f2017-12-08 02:13:02 +00001611 error("%s: cannot bind to path %s: %s",
1612 __func__, path, strerror(errno));
djm@openbsd.orgfd4eeee2017-12-08 02:14:33 +00001613 close(sock);
Damien Miller7acefbb2014-07-18 14:11:24 +10001614 errno = saved_errno;
1615 return -1;
1616 }
deraadt@openbsd.org4d28fa72019-06-28 13:35:04 +00001617 if (listen(sock, backlog) == -1) {
Damien Miller7acefbb2014-07-18 14:11:24 +10001618 saved_errno = errno;
djm@openbsd.org155072f2017-12-08 02:13:02 +00001619 error("%s: cannot listen on path %s: %s",
1620 __func__, path, strerror(errno));
djm@openbsd.orgfd4eeee2017-12-08 02:14:33 +00001621 close(sock);
1622 unlink(path);
Damien Miller7acefbb2014-07-18 14:11:24 +10001623 errno = saved_errno;
1624 return -1;
1625 }
1626 return sock;
1627}
Damien Miller46878022014-08-30 03:29:19 +10001628
Damien Miller04ee0f82009-11-18 17:48:30 +11001629void
1630sock_set_v6only(int s)
1631{
Damien Millerd86a3ba2015-12-09 09:18:45 +11001632#if defined(IPV6_V6ONLY) && !defined(__OpenBSD__)
Damien Miller04ee0f82009-11-18 17:48:30 +11001633 int on = 1;
1634
1635 debug3("%s: set socket %d IPV6_V6ONLY", __func__, s);
1636 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1)
1637 error("setsockopt IPV6_V6ONLY: %s", strerror(errno));
1638#endif
1639}
djm@openbsd.org0ccbd5e2016-04-06 06:42:17 +00001640
1641/*
1642 * Compares two strings that maybe be NULL. Returns non-zero if strings
1643 * are both NULL or are identical, returns zero otherwise.
1644 */
1645static int
1646strcmp_maybe_null(const char *a, const char *b)
1647{
1648 if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1649 return 0;
1650 if (a != NULL && strcmp(a, b) != 0)
1651 return 0;
1652 return 1;
1653}
1654
1655/*
1656 * Compare two forwards, returning non-zero if they are identical or
1657 * zero otherwise.
1658 */
1659int
1660forward_equals(const struct Forward *a, const struct Forward *b)
1661{
1662 if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1663 return 0;
1664 if (a->listen_port != b->listen_port)
1665 return 0;
1666 if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1667 return 0;
1668 if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1669 return 0;
1670 if (a->connect_port != b->connect_port)
1671 return 0;
1672 if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1673 return 0;
1674 /* allocated_port and handle are not checked */
1675 return 1;
1676}
1677
dtucker@openbsd.org7fc47662016-11-30 00:28:31 +00001678/* returns 1 if process is already daemonized, 0 otherwise */
1679int
1680daemonized(void)
1681{
1682 int fd;
1683
1684 if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1685 close(fd);
1686 return 0; /* have controlling terminal */
1687 }
1688 if (getppid() != 1)
1689 return 0; /* parent is not init */
1690 if (getsid(0) != getpid())
1691 return 0; /* not session leader */
1692 debug3("already daemonized");
1693 return 1;
1694}
djm@openbsd.orgde4ae072017-08-18 05:36:45 +00001695
1696
1697/*
1698 * Splits 's' into an argument vector. Handles quoted string and basic
1699 * escape characters (\\, \", \'). Caller must free the argument vector
1700 * and its members.
1701 */
1702int
1703argv_split(const char *s, int *argcp, char ***argvp)
1704{
1705 int r = SSH_ERR_INTERNAL_ERROR;
1706 int argc = 0, quote, i, j;
1707 char *arg, **argv = xcalloc(1, sizeof(*argv));
1708
1709 *argvp = NULL;
1710 *argcp = 0;
1711
1712 for (i = 0; s[i] != '\0'; i++) {
1713 /* Skip leading whitespace */
1714 if (s[i] == ' ' || s[i] == '\t')
1715 continue;
1716
1717 /* Start of a token */
1718 quote = 0;
1719 if (s[i] == '\\' &&
1720 (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\'))
1721 i++;
1722 else if (s[i] == '\'' || s[i] == '"')
1723 quote = s[i++];
1724
1725 argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
1726 arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
1727 argv[argc] = NULL;
1728
1729 /* Copy the token in, removing escapes */
1730 for (j = 0; s[i] != '\0'; i++) {
1731 if (s[i] == '\\') {
1732 if (s[i + 1] == '\'' ||
1733 s[i + 1] == '\"' ||
1734 s[i + 1] == '\\') {
1735 i++; /* Skip '\' */
1736 arg[j++] = s[i];
1737 } else {
1738 /* Unrecognised escape */
1739 arg[j++] = s[i];
1740 }
1741 } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
1742 break; /* done */
1743 else if (quote != 0 && s[i] == quote)
1744 break; /* done */
1745 else
1746 arg[j++] = s[i];
1747 }
1748 if (s[i] == '\0') {
1749 if (quote != 0) {
1750 /* Ran out of string looking for close quote */
1751 r = SSH_ERR_INVALID_FORMAT;
1752 goto out;
1753 }
1754 break;
1755 }
1756 }
1757 /* Success */
1758 *argcp = argc;
1759 *argvp = argv;
1760 argc = 0;
1761 argv = NULL;
1762 r = 0;
1763 out:
1764 if (argc != 0 && argv != NULL) {
1765 for (i = 0; i < argc; i++)
1766 free(argv[i]);
1767 free(argv);
1768 }
1769 return r;
1770}
1771
1772/*
1773 * Reassemble an argument vector into a string, quoting and escaping as
1774 * necessary. Caller must free returned string.
1775 */
1776char *
1777argv_assemble(int argc, char **argv)
1778{
1779 int i, j, ws, r;
1780 char c, *ret;
1781 struct sshbuf *buf, *arg;
1782
1783 if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
1784 fatal("%s: sshbuf_new failed", __func__);
1785
1786 for (i = 0; i < argc; i++) {
1787 ws = 0;
1788 sshbuf_reset(arg);
1789 for (j = 0; argv[i][j] != '\0'; j++) {
1790 r = 0;
1791 c = argv[i][j];
1792 switch (c) {
1793 case ' ':
1794 case '\t':
1795 ws = 1;
1796 r = sshbuf_put_u8(arg, c);
1797 break;
1798 case '\\':
1799 case '\'':
1800 case '"':
1801 if ((r = sshbuf_put_u8(arg, '\\')) != 0)
1802 break;
1803 /* FALLTHROUGH */
1804 default:
1805 r = sshbuf_put_u8(arg, c);
1806 break;
1807 }
1808 if (r != 0)
1809 fatal("%s: sshbuf_put_u8: %s",
1810 __func__, ssh_err(r));
1811 }
1812 if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
1813 (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
1814 (r = sshbuf_putb(buf, arg)) != 0 ||
1815 (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
1816 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1817 }
1818 if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
1819 fatal("%s: malloc failed", __func__);
1820 memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
1821 ret[sshbuf_len(buf)] = '\0';
1822 sshbuf_free(buf);
1823 sshbuf_free(arg);
1824 return ret;
1825}
1826
djm@openbsd.orgde4ae072017-08-18 05:36:45 +00001827/* Returns 0 if pid exited cleanly, non-zero otherwise */
1828int
djm@openbsd.orgb074c3c2017-08-18 05:48:04 +00001829exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
djm@openbsd.orgde4ae072017-08-18 05:36:45 +00001830{
1831 int status;
1832
1833 while (waitpid(pid, &status, 0) == -1) {
1834 if (errno != EINTR) {
1835 error("%s: waitpid: %s", tag, strerror(errno));
1836 return -1;
1837 }
1838 }
1839 if (WIFSIGNALED(status)) {
1840 error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
1841 return -1;
1842 } else if (WEXITSTATUS(status) != 0) {
djm@openbsd.orgb074c3c2017-08-18 05:48:04 +00001843 do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
1844 "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
djm@openbsd.orgde4ae072017-08-18 05:36:45 +00001845 return -1;
1846 }
1847 return 0;
1848}
1849
1850/*
1851 * Check a given path for security. This is defined as all components
1852 * of the path to the file must be owned by either the owner of
1853 * of the file or root and no directories must be group or world writable.
1854 *
1855 * XXX Should any specific check be done for sym links ?
1856 *
1857 * Takes a file name, its stat information (preferably from fstat() to
1858 * avoid races), the uid of the expected owner, their home directory and an
1859 * error buffer plus max size as arguments.
1860 *
1861 * Returns 0 on success and -1 on failure
1862 */
1863int
1864safe_path(const char *name, struct stat *stp, const char *pw_dir,
1865 uid_t uid, char *err, size_t errlen)
1866{
1867 char buf[PATH_MAX], homedir[PATH_MAX];
1868 char *cp;
1869 int comparehome = 0;
1870 struct stat st;
1871
1872 if (realpath(name, buf) == NULL) {
1873 snprintf(err, errlen, "realpath %s failed: %s", name,
1874 strerror(errno));
1875 return -1;
1876 }
1877 if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
1878 comparehome = 1;
1879
1880 if (!S_ISREG(stp->st_mode)) {
1881 snprintf(err, errlen, "%s is not a regular file", buf);
1882 return -1;
1883 }
1884 if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) ||
1885 (stp->st_mode & 022) != 0) {
1886 snprintf(err, errlen, "bad ownership or modes for file %s",
1887 buf);
1888 return -1;
1889 }
1890
1891 /* for each component of the canonical path, walking upwards */
1892 for (;;) {
1893 if ((cp = dirname(buf)) == NULL) {
1894 snprintf(err, errlen, "dirname() failed");
1895 return -1;
1896 }
1897 strlcpy(buf, cp, sizeof(buf));
1898
deraadt@openbsd.org4d28fa72019-06-28 13:35:04 +00001899 if (stat(buf, &st) == -1 ||
djm@openbsd.orgde4ae072017-08-18 05:36:45 +00001900 (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) ||
1901 (st.st_mode & 022) != 0) {
1902 snprintf(err, errlen,
1903 "bad ownership or modes for directory %s", buf);
1904 return -1;
1905 }
1906
1907 /* If are past the homedir then we can stop */
1908 if (comparehome && strcmp(homedir, buf) == 0)
1909 break;
1910
1911 /*
1912 * dirname should always complete with a "/" path,
1913 * but we can be paranoid and check for "." too
1914 */
1915 if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
1916 break;
1917 }
1918 return 0;
1919}
1920
1921/*
1922 * Version of safe_path() that accepts an open file descriptor to
1923 * avoid races.
1924 *
1925 * Returns 0 on success and -1 on failure
1926 */
1927int
1928safe_path_fd(int fd, const char *file, struct passwd *pw,
1929 char *err, size_t errlen)
1930{
1931 struct stat st;
1932
1933 /* check the open file to avoid races */
deraadt@openbsd.org4d28fa72019-06-28 13:35:04 +00001934 if (fstat(fd, &st) == -1) {
djm@openbsd.orgde4ae072017-08-18 05:36:45 +00001935 snprintf(err, errlen, "cannot stat file %s: %s",
1936 file, strerror(errno));
1937 return -1;
1938 }
1939 return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
1940}
1941
1942/*
1943 * Sets the value of the given variable in the environment. If the variable
1944 * already exists, its value is overridden.
1945 */
1946void
1947child_set_env(char ***envp, u_int *envsizep, const char *name,
1948 const char *value)
1949{
1950 char **env;
1951 u_int envsize;
1952 u_int i, namelen;
1953
1954 if (strchr(name, '=') != NULL) {
1955 error("Invalid environment variable \"%.100s\"", name);
1956 return;
1957 }
1958
1959 /*
1960 * If we're passed an uninitialized list, allocate a single null
1961 * entry before continuing.
1962 */
1963 if (*envp == NULL && *envsizep == 0) {
1964 *envp = xmalloc(sizeof(char *));
1965 *envp[0] = NULL;
1966 *envsizep = 1;
1967 }
1968
1969 /*
1970 * Find the slot where the value should be stored. If the variable
1971 * already exists, we reuse the slot; otherwise we append a new slot
1972 * at the end of the array, expanding if necessary.
1973 */
1974 env = *envp;
1975 namelen = strlen(name);
1976 for (i = 0; env[i]; i++)
1977 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
1978 break;
1979 if (env[i]) {
1980 /* Reuse the slot. */
1981 free(env[i]);
1982 } else {
1983 /* New variable. Expand if necessary. */
1984 envsize = *envsizep;
1985 if (i >= envsize - 1) {
1986 if (envsize >= 1000)
1987 fatal("child_set_env: too many env vars");
1988 envsize += 50;
1989 env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
1990 *envsizep = envsize;
1991 }
1992 /* Need to set the NULL pointer at end of array beyond the new slot. */
1993 env[i + 1] = NULL;
1994 }
1995
1996 /* Allocate space and format the variable in the appropriate slot. */
djm@openbsd.org7c856852018-03-03 03:15:51 +00001997 /* XXX xasprintf */
djm@openbsd.orgde4ae072017-08-18 05:36:45 +00001998 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
1999 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
2000}
2001
millert@openbsd.org887669e2017-10-21 23:06:24 +00002002/*
2003 * Check and optionally lowercase a domain name, also removes trailing '.'
2004 * Returns 1 on success and 0 on failure, storing an error message in errstr.
2005 */
2006int
2007valid_domain(char *name, int makelower, const char **errstr)
2008{
2009 size_t i, l = strlen(name);
2010 u_char c, last = '\0';
2011 static char errbuf[256];
2012
2013 if (l == 0) {
2014 strlcpy(errbuf, "empty domain name", sizeof(errbuf));
2015 goto bad;
2016 }
2017 if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
2018 snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
2019 "starts with invalid character", name);
2020 goto bad;
2021 }
2022 for (i = 0; i < l; i++) {
2023 c = tolower((u_char)name[i]);
2024 if (makelower)
2025 name[i] = (char)c;
2026 if (last == '.' && c == '.') {
2027 snprintf(errbuf, sizeof(errbuf), "domain name "
2028 "\"%.100s\" contains consecutive separators", name);
2029 goto bad;
2030 }
2031 if (c != '.' && c != '-' && !isalnum(c) &&
2032 c != '_') /* technically invalid, but common */ {
2033 snprintf(errbuf, sizeof(errbuf), "domain name "
2034 "\"%.100s\" contains invalid characters", name);
2035 goto bad;
2036 }
2037 last = c;
2038 }
2039 if (name[l - 1] == '.')
2040 name[l - 1] = '\0';
2041 if (errstr != NULL)
2042 *errstr = NULL;
2043 return 1;
2044bad:
2045 if (errstr != NULL)
2046 *errstr = errbuf;
2047 return 0;
2048}
dtucker@openbsd.org609d96b2017-12-05 23:59:47 +00002049
djm@openbsd.org5eff5b82018-10-03 06:38:35 +00002050/*
2051 * Verify that a environment variable name (not including initial '$') is
2052 * valid; consisting of one or more alphanumeric or underscore characters only.
2053 * Returns 1 on valid, 0 otherwise.
2054 */
2055int
2056valid_env_name(const char *name)
2057{
2058 const char *cp;
2059
2060 if (name[0] == '\0')
2061 return 0;
2062 for (cp = name; *cp != '\0'; cp++) {
2063 if (!isalnum((u_char)*cp) && *cp != '_')
2064 return 0;
2065 }
2066 return 1;
2067}
2068
dtucker@openbsd.org609d96b2017-12-05 23:59:47 +00002069const char *
2070atoi_err(const char *nptr, int *val)
2071{
2072 const char *errstr = NULL;
2073 long long num;
2074
2075 if (nptr == NULL || *nptr == '\0')
2076 return "missing";
2077 num = strtonum(nptr, 0, INT_MAX, &errstr);
2078 if (errstr == NULL)
2079 *val = (int)num;
2080 return errstr;
2081}
djm@openbsd.orgbf0fbf22018-03-12 00:52:01 +00002082
2083int
2084parse_absolute_time(const char *s, uint64_t *tp)
2085{
2086 struct tm tm;
2087 time_t tt;
2088 char buf[32], *fmt;
2089
2090 *tp = 0;
2091
2092 /*
2093 * POSIX strptime says "The application shall ensure that there
2094 * is white-space or other non-alphanumeric characters between
2095 * any two conversion specifications" so arrange things this way.
2096 */
2097 switch (strlen(s)) {
2098 case 8: /* YYYYMMDD */
2099 fmt = "%Y-%m-%d";
2100 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
2101 break;
2102 case 12: /* YYYYMMDDHHMM */
2103 fmt = "%Y-%m-%dT%H:%M";
2104 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s",
2105 s, s + 4, s + 6, s + 8, s + 10);
2106 break;
2107 case 14: /* YYYYMMDDHHMMSS */
2108 fmt = "%Y-%m-%dT%H:%M:%S";
2109 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
2110 s, s + 4, s + 6, s + 8, s + 10, s + 12);
2111 break;
2112 default:
2113 return SSH_ERR_INVALID_FORMAT;
2114 }
2115
2116 memset(&tm, 0, sizeof(tm));
2117 if (strptime(buf, fmt, &tm) == NULL)
2118 return SSH_ERR_INVALID_FORMAT;
2119 if ((tt = mktime(&tm)) < 0)
2120 return SSH_ERR_INVALID_FORMAT;
2121 /* success */
2122 *tp = (uint64_t)tt;
2123 return 0;
2124}
2125
2126void
2127format_absolute_time(uint64_t t, char *buf, size_t len)
2128{
2129 time_t tt = t > INT_MAX ? INT_MAX : t; /* XXX revisit in 2038 :P */
2130 struct tm tm;
2131
2132 localtime_r(&tt, &tm);
2133 strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
2134}
djm@openbsd.org2a358622018-11-16 03:26:01 +00002135
2136/* check if path is absolute */
2137int
2138path_absolute(const char *path)
2139{
2140 return (*path == '/') ? 1 : 0;
2141}
djm@openbsd.orgc72d78c2019-09-03 08:29:58 +00002142
2143void
2144skip_space(char **cpp)
2145{
2146 char *cp;
2147
2148 for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
2149 ;
2150 *cpp = cp;
2151}
djm@openbsd.org5485f8d2019-09-03 08:32:11 +00002152
2153/* authorized_key-style options parsing helpers */
2154
2155/*
2156 * Match flag 'opt' in *optsp, and if allow_negate is set then also match
2157 * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0
2158 * if negated option matches.
2159 * If the option or negated option matches, then *optsp is updated to
2160 * point to the first character after the option.
2161 */
2162int
2163opt_flag(const char *opt, int allow_negate, const char **optsp)
2164{
2165 size_t opt_len = strlen(opt);
2166 const char *opts = *optsp;
2167 int negate = 0;
2168
2169 if (allow_negate && strncasecmp(opts, "no-", 3) == 0) {
2170 opts += 3;
2171 negate = 1;
2172 }
2173 if (strncasecmp(opts, opt, opt_len) == 0) {
2174 *optsp = opts + opt_len;
2175 return negate ? 0 : 1;
2176 }
2177 return -1;
2178}
2179
2180char *
2181opt_dequote(const char **sp, const char **errstrp)
2182{
2183 const char *s = *sp;
2184 char *ret;
2185 size_t i;
2186
2187 *errstrp = NULL;
2188 if (*s != '"') {
2189 *errstrp = "missing start quote";
2190 return NULL;
2191 }
2192 s++;
2193 if ((ret = malloc(strlen((s)) + 1)) == NULL) {
2194 *errstrp = "memory allocation failed";
2195 return NULL;
2196 }
2197 for (i = 0; *s != '\0' && *s != '"';) {
2198 if (s[0] == '\\' && s[1] == '"')
2199 s++;
2200 ret[i++] = *s++;
2201 }
2202 if (*s == '\0') {
2203 *errstrp = "missing end quote";
2204 free(ret);
2205 return NULL;
2206 }
2207 ret[i] = '\0';
2208 s++;
2209 *sp = s;
2210 return ret;
2211}
2212
2213int
2214opt_match(const char **opts, const char *term)
2215{
2216 if (strncasecmp((*opts), term, strlen(term)) == 0 &&
2217 (*opts)[strlen(term)] == '=') {
2218 *opts += strlen(term) + 1;
2219 return 1;
2220 }
2221 return 0;
2222}
2223