djm@openbsd.org | 7c85685 | 2018-03-03 03:15:51 +0000 | [diff] [blame] | 1 | /* $OpenBSD: misc.c,v 1.125 2018/03/03 03:15:51 djm Exp $ */ |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
Damien Miller | 3f94188 | 2006-03-31 23:13:02 +1100 | [diff] [blame] | 4 | * Copyright (c) 2005,2006 Damien Miller. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 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 | |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 27 | #include "includes.h" |
Damien Miller | 17e91c0 | 2006-03-15 11:28:34 +1100 | [diff] [blame] | 28 | |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 29 | #include <sys/types.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 30 | #include <sys/ioctl.h> |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 31 | #include <sys/socket.h> |
djm@openbsd.org | de4ae07 | 2017-08-18 05:36:45 +0000 | [diff] [blame] | 32 | #include <sys/stat.h> |
dtucker@openbsd.org | 65a3c0d | 2016-01-20 09:22:39 +0000 | [diff] [blame] | 33 | #include <sys/time.h> |
djm@openbsd.org | de4ae07 | 2017-08-18 05:36:45 +0000 | [diff] [blame] | 34 | #include <sys/wait.h> |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 35 | #include <sys/un.h> |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 36 | |
deraadt@openbsd.org | 2ae4f33 | 2015-01-16 06:40:12 +0000 | [diff] [blame] | 37 | #include <limits.h> |
djm@openbsd.org | de4ae07 | 2017-08-18 05:36:45 +0000 | [diff] [blame] | 38 | #ifdef HAVE_LIBGEN_H |
| 39 | # include <libgen.h> |
| 40 | #endif |
| 41 | #include <signal.h> |
Darren Tucker | 5d19626 | 2006-07-12 22:15:16 +1000 | [diff] [blame] | 42 | #include <stdarg.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 43 | #include <stdio.h> |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 44 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 45 | #include <string.h> |
Damien Miller | 1708cb7 | 2011-01-13 12:21:34 +1100 | [diff] [blame] | 46 | #include <time.h> |
Damien Miller | e6b3b61 | 2006-07-24 14:01:23 +1000 | [diff] [blame] | 47 | #include <unistd.h> |
Darren Tucker | 5d19626 | 2006-07-12 22:15:16 +1000 | [diff] [blame] | 48 | |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 49 | #include <netinet/in.h> |
Damien Miller | 0dac6fb | 2010-11-20 15:19:38 +1100 | [diff] [blame] | 50 | #include <netinet/in_systm.h> |
| 51 | #include <netinet/ip.h> |
Damien Miller | 3a4051e | 2006-03-15 11:19:42 +1100 | [diff] [blame] | 52 | #include <netinet/tcp.h> |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 53 | |
Damien Miller | e9fc72e | 2013-10-15 12:14:12 +1100 | [diff] [blame] | 54 | #include <ctype.h> |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 55 | #include <errno.h> |
Damien Miller | 57cf638 | 2006-07-10 21:13:46 +1000 | [diff] [blame] | 56 | #include <fcntl.h> |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 57 | #include <netdb.h> |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 58 | #ifdef HAVE_PATHS_H |
Damien Miller | a9263d0 | 2006-03-15 11:18:26 +1100 | [diff] [blame] | 59 | # include <paths.h> |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 60 | #include <pwd.h> |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 61 | #endif |
Damien Miller | 3beb852 | 2006-01-02 23:40:10 +1100 | [diff] [blame] | 62 | #ifdef SSH_TUN_OPENBSD |
| 63 | #include <net/if.h> |
| 64 | #endif |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 65 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 66 | #include "xmalloc.h" |
Kevin Steves | b6e773a | 2001-02-04 13:20:36 +0000 | [diff] [blame] | 67 | #include "misc.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 68 | #include "log.h" |
Darren Tucker | da34553 | 2006-07-10 23:04:19 +1000 | [diff] [blame] | 69 | #include "ssh.h" |
djm@openbsd.org | de4ae07 | 2017-08-18 05:36:45 +0000 | [diff] [blame] | 70 | #include "sshbuf.h" |
| 71 | #include "ssherr.h" |
| 72 | #include "uidswap.h" |
Damien Miller | 07949bf | 2017-08-23 20:13:18 +1000 | [diff] [blame] | 73 | #include "platform.h" |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 74 | |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 75 | /* remove newline at end of string */ |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 76 | char * |
| 77 | chop(char *s) |
| 78 | { |
| 79 | char *t = s; |
| 80 | while (*t) { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 81 | if (*t == '\n' || *t == '\r') { |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 82 | *t = '\0'; |
| 83 | return s; |
| 84 | } |
| 85 | t++; |
| 86 | } |
| 87 | return s; |
| 88 | |
| 89 | } |
| 90 | |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 91 | /* set/unset filedescriptor to non-blocking */ |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 92 | int |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 93 | set_nonblock(int fd) |
| 94 | { |
| 95 | int val; |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 96 | |
krw@openbsd.org | 574def0 | 2016-04-02 14:37:42 +0000 | [diff] [blame] | 97 | val = fcntl(fd, F_GETFL); |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 98 | if (val < 0) { |
krw@openbsd.org | 574def0 | 2016-04-02 14:37:42 +0000 | [diff] [blame] | 99 | error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 100 | return (-1); |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 101 | } |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 102 | if (val & O_NONBLOCK) { |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 103 | debug3("fd %d is O_NONBLOCK", fd); |
| 104 | return (0); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 105 | } |
Damien Miller | ef095ce | 2003-05-14 13:41:39 +1000 | [diff] [blame] | 106 | debug2("fd %d setting O_NONBLOCK", fd); |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 107 | val |= O_NONBLOCK; |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 108 | if (fcntl(fd, F_SETFL, val) == -1) { |
| 109 | debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, |
| 110 | strerror(errno)); |
| 111 | return (-1); |
| 112 | } |
| 113 | return (0); |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 114 | } |
| 115 | |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 116 | int |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 117 | unset_nonblock(int fd) |
| 118 | { |
| 119 | int val; |
| 120 | |
krw@openbsd.org | 574def0 | 2016-04-02 14:37:42 +0000 | [diff] [blame] | 121 | val = fcntl(fd, F_GETFL); |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 122 | if (val < 0) { |
krw@openbsd.org | 574def0 | 2016-04-02 14:37:42 +0000 | [diff] [blame] | 123 | error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 124 | return (-1); |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 125 | } |
| 126 | if (!(val & O_NONBLOCK)) { |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 127 | debug3("fd %d is not O_NONBLOCK", fd); |
| 128 | return (0); |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 129 | } |
Ben Lindstrom | 352b1c2 | 2001-06-21 03:04:37 +0000 | [diff] [blame] | 130 | debug("fd %d clearing O_NONBLOCK", fd); |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 131 | val &= ~O_NONBLOCK; |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 132 | if (fcntl(fd, F_SETFL, val) == -1) { |
| 133 | debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", |
Ben Lindstrom | 84fcb31 | 2002-03-05 01:48:09 +0000 | [diff] [blame] | 134 | fd, strerror(errno)); |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 135 | return (-1); |
| 136 | } |
| 137 | return (0); |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 138 | } |
| 139 | |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 140 | const char * |
| 141 | ssh_gai_strerror(int gaierr) |
| 142 | { |
Damien Miller | 7313fc9 | 2013-07-18 16:13:19 +1000 | [diff] [blame] | 143 | if (gaierr == EAI_SYSTEM && errno != 0) |
Darren Tucker | 912428c | 2008-01-01 20:33:35 +1100 | [diff] [blame] | 144 | return strerror(errno); |
| 145 | return gai_strerror(gaierr); |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 146 | } |
| 147 | |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 148 | /* disable nagle on socket */ |
| 149 | void |
| 150 | set_nodelay(int fd) |
| 151 | { |
Ben Lindstrom | e86de51 | 2002-03-05 01:28:14 +0000 | [diff] [blame] | 152 | int opt; |
| 153 | socklen_t optlen; |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 154 | |
Ben Lindstrom | 1ebd7a5 | 2002-02-26 18:12:51 +0000 | [diff] [blame] | 155 | optlen = sizeof opt; |
| 156 | if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { |
Darren Tucker | 6db8f93 | 2003-11-03 20:07:14 +1100 | [diff] [blame] | 157 | debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); |
Ben Lindstrom | 1ebd7a5 | 2002-02-26 18:12:51 +0000 | [diff] [blame] | 158 | return; |
| 159 | } |
| 160 | if (opt == 1) { |
| 161 | debug2("fd %d is TCP_NODELAY", fd); |
| 162 | return; |
| 163 | } |
| 164 | opt = 1; |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 165 | debug2("fd %d setting TCP_NODELAY", fd); |
Ben Lindstrom | 1ebd7a5 | 2002-02-26 18:12:51 +0000 | [diff] [blame] | 166 | if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 167 | error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); |
| 168 | } |
| 169 | |
djm@openbsd.org | acf559e | 2017-10-25 00:15:35 +0000 | [diff] [blame] | 170 | /* Allow local port reuse in TIME_WAIT */ |
| 171 | int |
| 172 | set_reuseaddr(int fd) |
| 173 | { |
| 174 | int on = 1; |
| 175 | |
| 176 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) { |
| 177 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); |
| 178 | return -1; |
| 179 | } |
| 180 | return 0; |
| 181 | } |
| 182 | |
djm@openbsd.org | 35eb33f | 2017-10-25 00:17:08 +0000 | [diff] [blame] | 183 | /* Get/set routing domain */ |
| 184 | char * |
| 185 | get_rdomain(int fd) |
| 186 | { |
Damien Miller | 43c29bb | 2017-10-25 13:10:59 +1100 | [diff] [blame] | 187 | #if defined(HAVE_SYS_GET_RDOMAIN) |
| 188 | return sys_get_rdomain(fd); |
| 189 | #elif defined(__OpenBSD__) |
djm@openbsd.org | 35eb33f | 2017-10-25 00:17:08 +0000 | [diff] [blame] | 190 | int rtable; |
| 191 | char *ret; |
| 192 | socklen_t len = sizeof(rtable); |
| 193 | |
| 194 | if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) { |
| 195 | error("Failed to get routing domain for fd %d: %s", |
| 196 | fd, strerror(errno)); |
| 197 | return NULL; |
| 198 | } |
| 199 | xasprintf(&ret, "%d", rtable); |
| 200 | return ret; |
Damien Miller | 43c29bb | 2017-10-25 13:10:59 +1100 | [diff] [blame] | 201 | #else /* defined(__OpenBSD__) */ |
| 202 | return NULL; |
| 203 | #endif |
djm@openbsd.org | 35eb33f | 2017-10-25 00:17:08 +0000 | [diff] [blame] | 204 | } |
| 205 | |
djm@openbsd.org | acf559e | 2017-10-25 00:15:35 +0000 | [diff] [blame] | 206 | int |
| 207 | set_rdomain(int fd, const char *name) |
| 208 | { |
Damien Miller | 43c29bb | 2017-10-25 13:10:59 +1100 | [diff] [blame] | 209 | #if defined(HAVE_SYS_SET_RDOMAIN) |
| 210 | return sys_set_rdomain(fd, name); |
| 211 | #elif defined(__OpenBSD__) |
djm@openbsd.org | acf559e | 2017-10-25 00:15:35 +0000 | [diff] [blame] | 212 | int rtable; |
| 213 | const char *errstr; |
| 214 | |
| 215 | if (name == NULL) |
| 216 | return 0; /* default table */ |
| 217 | |
| 218 | rtable = (int)strtonum(name, 0, 255, &errstr); |
| 219 | if (errstr != NULL) { |
| 220 | /* Shouldn't happen */ |
| 221 | error("Invalid routing domain \"%s\": %s", name, errstr); |
| 222 | return -1; |
| 223 | } |
| 224 | if (setsockopt(fd, SOL_SOCKET, SO_RTABLE, |
| 225 | &rtable, sizeof(rtable)) == -1) { |
| 226 | error("Failed to set routing domain %d on fd %d: %s", |
| 227 | rtable, fd, strerror(errno)); |
| 228 | return -1; |
| 229 | } |
| 230 | return 0; |
Damien Miller | 43c29bb | 2017-10-25 13:10:59 +1100 | [diff] [blame] | 231 | #else /* defined(__OpenBSD__) */ |
| 232 | error("Setting routing domain is not supported on this platform"); |
| 233 | return -1; |
| 234 | #endif |
djm@openbsd.org | acf559e | 2017-10-25 00:15:35 +0000 | [diff] [blame] | 235 | } |
| 236 | |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 237 | /* Characters considered whitespace in strsep calls. */ |
| 238 | #define WHITESPACE " \t\r\n" |
Damien Miller | 306d118 | 2006-03-15 12:05:59 +1100 | [diff] [blame] | 239 | #define QUOTE "\"" |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 240 | |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 241 | /* return next token in configuration line */ |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 242 | char * |
| 243 | strdelim(char **s) |
| 244 | { |
djm@openbsd.org | 713d9cb | 2018-03-02 03:02:11 +0000 | [diff] [blame] | 245 | char *old, *cp; |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 246 | int wspace = 0; |
| 247 | |
| 248 | if (*s == NULL) |
| 249 | return NULL; |
| 250 | |
| 251 | old = *s; |
| 252 | |
Damien Miller | 306d118 | 2006-03-15 12:05:59 +1100 | [diff] [blame] | 253 | *s = strpbrk(*s, WHITESPACE QUOTE "="); |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 254 | if (*s == NULL) |
| 255 | return (old); |
| 256 | |
Damien Miller | 306d118 | 2006-03-15 12:05:59 +1100 | [diff] [blame] | 257 | if (*s[0] == '\"') { |
| 258 | memmove(*s, *s + 1, strlen(*s)); /* move nul too */ |
djm@openbsd.org | 713d9cb | 2018-03-02 03:02:11 +0000 | [diff] [blame] | 259 | |
Damien Miller | 306d118 | 2006-03-15 12:05:59 +1100 | [diff] [blame] | 260 | /* Find matching quote */ |
djm@openbsd.org | 713d9cb | 2018-03-02 03:02:11 +0000 | [diff] [blame] | 261 | for (cp = *s; ; cp++) { |
| 262 | if (*cp == '\0') |
| 263 | return NULL; /* no matching quote */ |
| 264 | if (*cp == '\\') { |
| 265 | /* Escape sequence */ |
| 266 | if (cp[1] == '\"' || cp[1] == '\'' || |
| 267 | cp[1] == '\\') { |
| 268 | memmove(cp, cp + 1, strlen(cp)); |
| 269 | continue; |
| 270 | } |
| 271 | return NULL; /* invalid escape */ |
| 272 | } else if (*cp == '\"') { |
| 273 | *(cp++) = '\0'; |
| 274 | *s += strspn(cp, WHITESPACE); |
| 275 | return old; |
| 276 | } |
Damien Miller | 306d118 | 2006-03-15 12:05:59 +1100 | [diff] [blame] | 277 | } |
| 278 | } |
| 279 | |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 280 | /* Allow only one '=' to be skipped */ |
| 281 | if (*s[0] == '=') |
| 282 | wspace = 1; |
| 283 | *s[0] = '\0'; |
| 284 | |
Damien Miller | 306d118 | 2006-03-15 12:05:59 +1100 | [diff] [blame] | 285 | /* Skip any extra whitespace after first token */ |
Damien Miller | 61c5150 | 2000-08-18 14:01:04 +1000 | [diff] [blame] | 286 | *s += strspn(*s + 1, WHITESPACE) + 1; |
| 287 | if (*s[0] == '=' && !wspace) |
| 288 | *s += strspn(*s + 1, WHITESPACE) + 1; |
| 289 | |
| 290 | return (old); |
| 291 | } |
Kevin Steves | b6e773a | 2001-02-04 13:20:36 +0000 | [diff] [blame] | 292 | |
Ben Lindstrom | 086cf21 | 2001-03-05 05:56:40 +0000 | [diff] [blame] | 293 | struct passwd * |
| 294 | pwcopy(struct passwd *pw) |
| 295 | { |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 296 | struct passwd *copy = xcalloc(1, sizeof(*copy)); |
Ben Lindstrom | 4030442 | 2001-03-05 06:22:01 +0000 | [diff] [blame] | 297 | |
Ben Lindstrom | 086cf21 | 2001-03-05 05:56:40 +0000 | [diff] [blame] | 298 | copy->pw_name = xstrdup(pw->pw_name); |
| 299 | copy->pw_passwd = xstrdup(pw->pw_passwd); |
Damien Miller | 6332da2 | 2013-04-23 14:25:52 +1000 | [diff] [blame] | 300 | #ifdef HAVE_STRUCT_PASSWD_PW_GECOS |
Ben Lindstrom | 4030442 | 2001-03-05 06:22:01 +0000 | [diff] [blame] | 301 | copy->pw_gecos = xstrdup(pw->pw_gecos); |
Damien Miller | 6332da2 | 2013-04-23 14:25:52 +1000 | [diff] [blame] | 302 | #endif |
Ben Lindstrom | 086cf21 | 2001-03-05 05:56:40 +0000 | [diff] [blame] | 303 | copy->pw_uid = pw->pw_uid; |
| 304 | copy->pw_gid = pw->pw_gid; |
Damien Miller | 6332da2 | 2013-04-23 14:25:52 +1000 | [diff] [blame] | 305 | #ifdef HAVE_STRUCT_PASSWD_PW_EXPIRE |
Ben Lindstrom | 3af4d46 | 2001-06-21 03:11:27 +0000 | [diff] [blame] | 306 | copy->pw_expire = pw->pw_expire; |
Kevin Steves | 8245695 | 2001-06-22 21:14:18 +0000 | [diff] [blame] | 307 | #endif |
Damien Miller | 6332da2 | 2013-04-23 14:25:52 +1000 | [diff] [blame] | 308 | #ifdef HAVE_STRUCT_PASSWD_PW_CHANGE |
Ben Lindstrom | 3af4d46 | 2001-06-21 03:11:27 +0000 | [diff] [blame] | 309 | copy->pw_change = pw->pw_change; |
Kevin Steves | 8245695 | 2001-06-22 21:14:18 +0000 | [diff] [blame] | 310 | #endif |
Damien Miller | 6332da2 | 2013-04-23 14:25:52 +1000 | [diff] [blame] | 311 | #ifdef HAVE_STRUCT_PASSWD_PW_CLASS |
Ben Lindstrom | 086cf21 | 2001-03-05 05:56:40 +0000 | [diff] [blame] | 312 | copy->pw_class = xstrdup(pw->pw_class); |
Ben Lindstrom | 0f68db4 | 2001-03-05 07:57:09 +0000 | [diff] [blame] | 313 | #endif |
Ben Lindstrom | 086cf21 | 2001-03-05 05:56:40 +0000 | [diff] [blame] | 314 | copy->pw_dir = xstrdup(pw->pw_dir); |
| 315 | copy->pw_shell = xstrdup(pw->pw_shell); |
| 316 | return copy; |
| 317 | } |
| 318 | |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 319 | /* |
| 320 | * Convert ASCII string to TCP/IP port number. |
Damien Miller | 3dc71ad | 2009-01-28 16:31:22 +1100 | [diff] [blame] | 321 | * Port must be >=0 and <=65535. |
| 322 | * Return -1 if invalid. |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 323 | */ |
| 324 | int |
| 325 | a2port(const char *s) |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 326 | { |
Damien Miller | 3dc71ad | 2009-01-28 16:31:22 +1100 | [diff] [blame] | 327 | long long port; |
| 328 | const char *errstr; |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 329 | |
Damien Miller | 3dc71ad | 2009-01-28 16:31:22 +1100 | [diff] [blame] | 330 | port = strtonum(s, 0, 65535, &errstr); |
| 331 | if (errstr != NULL) |
| 332 | return -1; |
| 333 | return (int)port; |
Ben Lindstrom | 19066a1 | 2001-04-12 23:39:26 +0000 | [diff] [blame] | 334 | } |
| 335 | |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 336 | int |
| 337 | a2tun(const char *s, int *remote) |
| 338 | { |
| 339 | const char *errstr = NULL; |
| 340 | char *sp, *ep; |
| 341 | int tun; |
| 342 | |
| 343 | if (remote != NULL) { |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 344 | *remote = SSH_TUNID_ANY; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 345 | sp = xstrdup(s); |
| 346 | if ((ep = strchr(sp, ':')) == NULL) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 347 | free(sp); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 348 | return (a2tun(s, NULL)); |
| 349 | } |
| 350 | ep[0] = '\0'; ep++; |
| 351 | *remote = a2tun(ep, NULL); |
| 352 | tun = a2tun(sp, NULL); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 353 | free(sp); |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 354 | return (*remote == SSH_TUNID_ERR ? *remote : tun); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | if (strcasecmp(s, "any") == 0) |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 358 | return (SSH_TUNID_ANY); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 359 | |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 360 | tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); |
| 361 | if (errstr != NULL) |
| 362 | return (SSH_TUNID_ERR); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 363 | |
| 364 | return (tun); |
| 365 | } |
| 366 | |
Ben Lindstrom | 1bda4c8 | 2001-06-05 19:59:08 +0000 | [diff] [blame] | 367 | #define SECONDS 1 |
| 368 | #define MINUTES (SECONDS * 60) |
| 369 | #define HOURS (MINUTES * 60) |
| 370 | #define DAYS (HOURS * 24) |
| 371 | #define WEEKS (DAYS * 7) |
| 372 | |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 373 | /* |
| 374 | * Convert a time string into seconds; format is |
| 375 | * a sequence of: |
| 376 | * time[qualifier] |
| 377 | * |
| 378 | * Valid time qualifiers are: |
| 379 | * <none> seconds |
| 380 | * s|S seconds |
| 381 | * m|M minutes |
| 382 | * h|H hours |
| 383 | * d|D days |
| 384 | * w|W weeks |
| 385 | * |
| 386 | * Examples: |
| 387 | * 90m 90 minutes |
| 388 | * 1h30m 90 minutes |
| 389 | * 2d 2 days |
| 390 | * 1w 1 week |
| 391 | * |
| 392 | * Return -1 if time string is invalid. |
| 393 | */ |
| 394 | long |
| 395 | convtime(const char *s) |
Ben Lindstrom | 1bda4c8 | 2001-06-05 19:59:08 +0000 | [diff] [blame] | 396 | { |
dtucker@openbsd.org | f5746b4 | 2017-03-14 00:25:03 +0000 | [diff] [blame] | 397 | long total, secs, multiplier = 1; |
Ben Lindstrom | 1bda4c8 | 2001-06-05 19:59:08 +0000 | [diff] [blame] | 398 | const char *p; |
| 399 | char *endp; |
| 400 | |
| 401 | errno = 0; |
| 402 | total = 0; |
| 403 | p = s; |
| 404 | |
| 405 | if (p == NULL || *p == '\0') |
| 406 | return -1; |
| 407 | |
| 408 | while (*p) { |
| 409 | secs = strtol(p, &endp, 10); |
| 410 | if (p == endp || |
| 411 | (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || |
| 412 | secs < 0) |
| 413 | return -1; |
| 414 | |
| 415 | switch (*endp++) { |
| 416 | case '\0': |
| 417 | endp--; |
Damien Miller | 69b7203 | 2006-03-26 14:02:35 +1100 | [diff] [blame] | 418 | break; |
Ben Lindstrom | 1bda4c8 | 2001-06-05 19:59:08 +0000 | [diff] [blame] | 419 | case 's': |
| 420 | case 'S': |
| 421 | break; |
| 422 | case 'm': |
| 423 | case 'M': |
dtucker@openbsd.org | f5746b4 | 2017-03-14 00:25:03 +0000 | [diff] [blame] | 424 | multiplier = MINUTES; |
Ben Lindstrom | 1bda4c8 | 2001-06-05 19:59:08 +0000 | [diff] [blame] | 425 | break; |
| 426 | case 'h': |
| 427 | case 'H': |
dtucker@openbsd.org | f5746b4 | 2017-03-14 00:25:03 +0000 | [diff] [blame] | 428 | multiplier = HOURS; |
Ben Lindstrom | 1bda4c8 | 2001-06-05 19:59:08 +0000 | [diff] [blame] | 429 | break; |
| 430 | case 'd': |
| 431 | case 'D': |
dtucker@openbsd.org | f5746b4 | 2017-03-14 00:25:03 +0000 | [diff] [blame] | 432 | multiplier = DAYS; |
Ben Lindstrom | 1bda4c8 | 2001-06-05 19:59:08 +0000 | [diff] [blame] | 433 | break; |
| 434 | case 'w': |
| 435 | case 'W': |
dtucker@openbsd.org | f5746b4 | 2017-03-14 00:25:03 +0000 | [diff] [blame] | 436 | multiplier = WEEKS; |
Ben Lindstrom | 1bda4c8 | 2001-06-05 19:59:08 +0000 | [diff] [blame] | 437 | break; |
| 438 | default: |
| 439 | return -1; |
| 440 | } |
dtucker@openbsd.org | c6774d2 | 2017-03-14 00:55:37 +0000 | [diff] [blame] | 441 | if (secs >= LONG_MAX / multiplier) |
dtucker@openbsd.org | f5746b4 | 2017-03-14 00:25:03 +0000 | [diff] [blame] | 442 | return -1; |
| 443 | secs *= multiplier; |
dtucker@openbsd.org | c6774d2 | 2017-03-14 00:55:37 +0000 | [diff] [blame] | 444 | if (total >= LONG_MAX - secs) |
dtucker@openbsd.org | f5746b4 | 2017-03-14 00:25:03 +0000 | [diff] [blame] | 445 | return -1; |
Ben Lindstrom | 1bda4c8 | 2001-06-05 19:59:08 +0000 | [diff] [blame] | 446 | total += secs; |
| 447 | if (total < 0) |
| 448 | return -1; |
| 449 | p = endp; |
| 450 | } |
| 451 | |
| 452 | return total; |
| 453 | } |
| 454 | |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 455 | /* |
Darren Tucker | da34553 | 2006-07-10 23:04:19 +1000 | [diff] [blame] | 456 | * Returns a standardized host+port identifier string. |
| 457 | * Caller must free returned string. |
| 458 | */ |
| 459 | char * |
| 460 | put_host_port(const char *host, u_short port) |
| 461 | { |
| 462 | char *hoststr; |
| 463 | |
| 464 | if (port == 0 || port == SSH_DEFAULT_PORT) |
| 465 | return(xstrdup(host)); |
| 466 | if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0) |
| 467 | fatal("put_host_port: asprintf: %s", strerror(errno)); |
| 468 | debug3("put_host_port: %s", hoststr); |
| 469 | return hoststr; |
| 470 | } |
| 471 | |
| 472 | /* |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 473 | * Search for next delimiter between hostnames/addresses and ports. |
| 474 | * Argument may be modified (for termination). |
| 475 | * Returns *cp if parsing succeeds. |
millert@openbsd.org | 887669e | 2017-10-21 23:06:24 +0000 | [diff] [blame] | 476 | * *cp is set to the start of the next field, if one was found. |
| 477 | * The delimiter char, if present, is stored in delim. |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 478 | * If this is the last field, *cp is set to NULL. |
| 479 | */ |
millert@openbsd.org | 887669e | 2017-10-21 23:06:24 +0000 | [diff] [blame] | 480 | static char * |
| 481 | hpdelim2(char **cp, char *delim) |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 482 | { |
| 483 | char *s, *old; |
| 484 | |
| 485 | if (cp == NULL || *cp == NULL) |
| 486 | return NULL; |
| 487 | |
| 488 | old = s = *cp; |
| 489 | if (*s == '[') { |
| 490 | if ((s = strchr(s, ']')) == NULL) |
| 491 | return NULL; |
| 492 | else |
| 493 | s++; |
| 494 | } else if ((s = strpbrk(s, ":/")) == NULL) |
| 495 | s = *cp + strlen(*cp); /* skip to end (see first case below) */ |
| 496 | |
| 497 | switch (*s) { |
| 498 | case '\0': |
| 499 | *cp = NULL; /* no more fields*/ |
| 500 | break; |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 501 | |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 502 | case ':': |
| 503 | case '/': |
millert@openbsd.org | 887669e | 2017-10-21 23:06:24 +0000 | [diff] [blame] | 504 | if (delim != NULL) |
| 505 | *delim = *s; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 506 | *s = '\0'; /* terminate */ |
| 507 | *cp = s + 1; |
| 508 | break; |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 509 | |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 510 | default: |
| 511 | return NULL; |
| 512 | } |
| 513 | |
| 514 | return old; |
| 515 | } |
| 516 | |
Ben Lindstrom | 4529b70 | 2001-05-03 23:39:53 +0000 | [diff] [blame] | 517 | char * |
millert@openbsd.org | 887669e | 2017-10-21 23:06:24 +0000 | [diff] [blame] | 518 | hpdelim(char **cp) |
| 519 | { |
| 520 | return hpdelim2(cp, NULL); |
| 521 | } |
| 522 | |
| 523 | char * |
Ben Lindstrom | 4529b70 | 2001-05-03 23:39:53 +0000 | [diff] [blame] | 524 | cleanhostname(char *host) |
| 525 | { |
| 526 | if (*host == '[' && host[strlen(host) - 1] == ']') { |
| 527 | host[strlen(host) - 1] = '\0'; |
| 528 | return (host + 1); |
| 529 | } else |
| 530 | return host; |
| 531 | } |
| 532 | |
| 533 | char * |
| 534 | colon(char *cp) |
| 535 | { |
| 536 | int flag = 0; |
| 537 | |
| 538 | if (*cp == ':') /* Leading colon is part of file name. */ |
Damien Miller | 2e77446 | 2010-06-26 09:30:47 +1000 | [diff] [blame] | 539 | return NULL; |
Ben Lindstrom | 4529b70 | 2001-05-03 23:39:53 +0000 | [diff] [blame] | 540 | if (*cp == '[') |
| 541 | flag = 1; |
| 542 | |
| 543 | for (; *cp; ++cp) { |
| 544 | if (*cp == '@' && *(cp+1) == '[') |
| 545 | flag = 1; |
| 546 | if (*cp == ']' && *(cp+1) == ':' && flag) |
| 547 | return (cp+1); |
| 548 | if (*cp == ':' && !flag) |
| 549 | return (cp); |
| 550 | if (*cp == '/') |
Damien Miller | 2e77446 | 2010-06-26 09:30:47 +1000 | [diff] [blame] | 551 | return NULL; |
Ben Lindstrom | 4529b70 | 2001-05-03 23:39:53 +0000 | [diff] [blame] | 552 | } |
Damien Miller | 2e77446 | 2010-06-26 09:30:47 +1000 | [diff] [blame] | 553 | return NULL; |
Ben Lindstrom | 4529b70 | 2001-05-03 23:39:53 +0000 | [diff] [blame] | 554 | } |
| 555 | |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 556 | /* |
millert@openbsd.org | 887669e | 2017-10-21 23:06:24 +0000 | [diff] [blame] | 557 | * Parse a [user@]host:[path] string. |
| 558 | * Caller must free returned user, host and path. |
| 559 | * Any of the pointer return arguments may be NULL (useful for syntax checking). |
| 560 | * If user was not specified then *userp will be set to NULL. |
| 561 | * If host was not specified then *hostp will be set to NULL. |
| 562 | * If path was not specified then *pathp will be set to ".". |
| 563 | * Returns 0 on success, -1 on failure. |
| 564 | */ |
| 565 | int |
| 566 | parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp) |
| 567 | { |
| 568 | char *user = NULL, *host = NULL, *path = NULL; |
| 569 | char *sdup, *tmp; |
| 570 | int ret = -1; |
| 571 | |
| 572 | if (userp != NULL) |
| 573 | *userp = NULL; |
| 574 | if (hostp != NULL) |
| 575 | *hostp = NULL; |
| 576 | if (pathp != NULL) |
| 577 | *pathp = NULL; |
| 578 | |
millert@openbsd.org | b9903ee | 2017-10-24 19:41:45 +0000 | [diff] [blame] | 579 | sdup = xstrdup(s); |
millert@openbsd.org | 887669e | 2017-10-21 23:06:24 +0000 | [diff] [blame] | 580 | |
| 581 | /* Check for remote syntax: [user@]host:[path] */ |
| 582 | if ((tmp = colon(sdup)) == NULL) |
| 583 | goto out; |
| 584 | |
| 585 | /* Extract optional path */ |
| 586 | *tmp++ = '\0'; |
| 587 | if (*tmp == '\0') |
| 588 | tmp = "."; |
| 589 | path = xstrdup(tmp); |
| 590 | |
| 591 | /* Extract optional user and mandatory host */ |
| 592 | tmp = strrchr(sdup, '@'); |
| 593 | if (tmp != NULL) { |
| 594 | *tmp++ = '\0'; |
| 595 | host = xstrdup(cleanhostname(tmp)); |
| 596 | if (*sdup != '\0') |
| 597 | user = xstrdup(sdup); |
| 598 | } else { |
| 599 | host = xstrdup(cleanhostname(sdup)); |
| 600 | user = NULL; |
| 601 | } |
| 602 | |
| 603 | /* Success */ |
| 604 | if (userp != NULL) { |
| 605 | *userp = user; |
| 606 | user = NULL; |
| 607 | } |
| 608 | if (hostp != NULL) { |
| 609 | *hostp = host; |
| 610 | host = NULL; |
millert@openbsd.org | b9903ee | 2017-10-24 19:41:45 +0000 | [diff] [blame] | 611 | } |
millert@openbsd.org | 887669e | 2017-10-21 23:06:24 +0000 | [diff] [blame] | 612 | if (pathp != NULL) { |
| 613 | *pathp = path; |
| 614 | path = NULL; |
millert@openbsd.org | b9903ee | 2017-10-24 19:41:45 +0000 | [diff] [blame] | 615 | } |
millert@openbsd.org | 887669e | 2017-10-21 23:06:24 +0000 | [diff] [blame] | 616 | ret = 0; |
| 617 | out: |
| 618 | free(sdup); |
| 619 | free(user); |
| 620 | free(host); |
| 621 | free(path); |
| 622 | return ret; |
| 623 | } |
| 624 | |
| 625 | /* |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 626 | * Parse a [user@]host[:port] string. |
| 627 | * Caller must free returned user and host. |
| 628 | * Any of the pointer return arguments may be NULL (useful for syntax checking). |
| 629 | * If user was not specified then *userp will be set to NULL. |
| 630 | * If port was not specified then *portp will be -1. |
| 631 | * Returns 0 on success, -1 on failure. |
| 632 | */ |
| 633 | int |
| 634 | parse_user_host_port(const char *s, char **userp, char **hostp, int *portp) |
| 635 | { |
| 636 | char *sdup, *cp, *tmp; |
| 637 | char *user = NULL, *host = NULL; |
| 638 | int port = -1, ret = -1; |
| 639 | |
| 640 | if (userp != NULL) |
| 641 | *userp = NULL; |
| 642 | if (hostp != NULL) |
| 643 | *hostp = NULL; |
| 644 | if (portp != NULL) |
| 645 | *portp = -1; |
| 646 | |
| 647 | if ((sdup = tmp = strdup(s)) == NULL) |
| 648 | return -1; |
| 649 | /* Extract optional username */ |
millert@openbsd.org | 887669e | 2017-10-21 23:06:24 +0000 | [diff] [blame] | 650 | if ((cp = strrchr(tmp, '@')) != NULL) { |
djm@openbsd.org | ed877ef | 2016-07-15 00:24:30 +0000 | [diff] [blame] | 651 | *cp = '\0'; |
| 652 | if (*tmp == '\0') |
| 653 | goto out; |
| 654 | if ((user = strdup(tmp)) == NULL) |
| 655 | goto out; |
| 656 | tmp = cp + 1; |
| 657 | } |
| 658 | /* Extract mandatory hostname */ |
| 659 | if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0') |
| 660 | goto out; |
| 661 | host = xstrdup(cleanhostname(cp)); |
| 662 | /* Convert and verify optional port */ |
| 663 | if (tmp != NULL && *tmp != '\0') { |
| 664 | if ((port = a2port(tmp)) <= 0) |
| 665 | goto out; |
| 666 | } |
| 667 | /* Success */ |
| 668 | if (userp != NULL) { |
| 669 | *userp = user; |
| 670 | user = NULL; |
| 671 | } |
| 672 | if (hostp != NULL) { |
| 673 | *hostp = host; |
| 674 | host = NULL; |
| 675 | } |
| 676 | if (portp != NULL) |
| 677 | *portp = port; |
| 678 | ret = 0; |
| 679 | out: |
| 680 | free(sdup); |
| 681 | free(user); |
| 682 | free(host); |
| 683 | return ret; |
| 684 | } |
| 685 | |
millert@openbsd.org | 887669e | 2017-10-21 23:06:24 +0000 | [diff] [blame] | 686 | /* |
| 687 | * Converts a two-byte hex string to decimal. |
| 688 | * Returns the decimal value or -1 for invalid input. |
| 689 | */ |
| 690 | static int |
| 691 | hexchar(const char *s) |
| 692 | { |
| 693 | unsigned char result[2]; |
| 694 | int i; |
| 695 | |
| 696 | for (i = 0; i < 2; i++) { |
| 697 | if (s[i] >= '0' && s[i] <= '9') |
| 698 | result[i] = (unsigned char)(s[i] - '0'); |
| 699 | else if (s[i] >= 'a' && s[i] <= 'f') |
| 700 | result[i] = (unsigned char)(s[i] - 'a') + 10; |
| 701 | else if (s[i] >= 'A' && s[i] <= 'F') |
| 702 | result[i] = (unsigned char)(s[i] - 'A') + 10; |
| 703 | else |
| 704 | return -1; |
| 705 | } |
| 706 | return (result[0] << 4) | result[1]; |
| 707 | } |
| 708 | |
| 709 | /* |
| 710 | * Decode an url-encoded string. |
| 711 | * Returns a newly allocated string on success or NULL on failure. |
| 712 | */ |
| 713 | static char * |
| 714 | urldecode(const char *src) |
| 715 | { |
| 716 | char *ret, *dst; |
| 717 | int ch; |
| 718 | |
| 719 | ret = xmalloc(strlen(src) + 1); |
| 720 | for (dst = ret; *src != '\0'; src++) { |
| 721 | switch (*src) { |
| 722 | case '+': |
| 723 | *dst++ = ' '; |
| 724 | break; |
| 725 | case '%': |
| 726 | if (!isxdigit((unsigned char)src[1]) || |
| 727 | !isxdigit((unsigned char)src[2]) || |
| 728 | (ch = hexchar(src + 1)) == -1) { |
| 729 | free(ret); |
| 730 | return NULL; |
| 731 | } |
| 732 | *dst++ = ch; |
| 733 | src += 2; |
| 734 | break; |
| 735 | default: |
| 736 | *dst++ = *src; |
| 737 | break; |
| 738 | } |
| 739 | } |
| 740 | *dst = '\0'; |
| 741 | |
| 742 | return ret; |
| 743 | } |
| 744 | |
| 745 | /* |
| 746 | * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI. |
| 747 | * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04 |
| 748 | * Either user or path may be url-encoded (but not host or port). |
| 749 | * Caller must free returned user, host and path. |
| 750 | * Any of the pointer return arguments may be NULL (useful for syntax checking) |
| 751 | * but the scheme must always be specified. |
| 752 | * If user was not specified then *userp will be set to NULL. |
| 753 | * If port was not specified then *portp will be -1. |
| 754 | * If path was not specified then *pathp will be set to NULL. |
| 755 | * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri. |
| 756 | */ |
| 757 | int |
| 758 | parse_uri(const char *scheme, const char *uri, char **userp, char **hostp, |
| 759 | int *portp, char **pathp) |
| 760 | { |
| 761 | char *uridup, *cp, *tmp, ch; |
| 762 | char *user = NULL, *host = NULL, *path = NULL; |
| 763 | int port = -1, ret = -1; |
| 764 | size_t len; |
| 765 | |
| 766 | len = strlen(scheme); |
| 767 | if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0) |
| 768 | return 1; |
| 769 | uri += len + 3; |
| 770 | |
| 771 | if (userp != NULL) |
| 772 | *userp = NULL; |
| 773 | if (hostp != NULL) |
| 774 | *hostp = NULL; |
| 775 | if (portp != NULL) |
| 776 | *portp = -1; |
| 777 | if (pathp != NULL) |
| 778 | *pathp = NULL; |
| 779 | |
| 780 | uridup = tmp = xstrdup(uri); |
| 781 | |
| 782 | /* Extract optional ssh-info (username + connection params) */ |
| 783 | if ((cp = strchr(tmp, '@')) != NULL) { |
| 784 | char *delim; |
| 785 | |
| 786 | *cp = '\0'; |
| 787 | /* Extract username and connection params */ |
| 788 | if ((delim = strchr(tmp, ';')) != NULL) { |
| 789 | /* Just ignore connection params for now */ |
| 790 | *delim = '\0'; |
| 791 | } |
| 792 | if (*tmp == '\0') { |
| 793 | /* Empty username */ |
| 794 | goto out; |
| 795 | } |
| 796 | if ((user = urldecode(tmp)) == NULL) |
| 797 | goto out; |
| 798 | tmp = cp + 1; |
| 799 | } |
| 800 | |
| 801 | /* Extract mandatory hostname */ |
| 802 | if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0') |
| 803 | goto out; |
| 804 | host = xstrdup(cleanhostname(cp)); |
| 805 | if (!valid_domain(host, 0, NULL)) |
| 806 | goto out; |
| 807 | |
| 808 | if (tmp != NULL && *tmp != '\0') { |
| 809 | if (ch == ':') { |
| 810 | /* Convert and verify port. */ |
| 811 | if ((cp = strchr(tmp, '/')) != NULL) |
| 812 | *cp = '\0'; |
| 813 | if ((port = a2port(tmp)) <= 0) |
| 814 | goto out; |
| 815 | tmp = cp ? cp + 1 : NULL; |
| 816 | } |
| 817 | if (tmp != NULL && *tmp != '\0') { |
| 818 | /* Extract optional path */ |
| 819 | if ((path = urldecode(tmp)) == NULL) |
| 820 | goto out; |
| 821 | } |
| 822 | } |
| 823 | |
| 824 | /* Success */ |
| 825 | if (userp != NULL) { |
| 826 | *userp = user; |
| 827 | user = NULL; |
| 828 | } |
| 829 | if (hostp != NULL) { |
| 830 | *hostp = host; |
| 831 | host = NULL; |
| 832 | } |
| 833 | if (portp != NULL) |
| 834 | *portp = port; |
| 835 | if (pathp != NULL) { |
| 836 | *pathp = path; |
| 837 | path = NULL; |
| 838 | } |
| 839 | ret = 0; |
| 840 | out: |
| 841 | free(uridup); |
| 842 | free(user); |
| 843 | free(host); |
| 844 | free(path); |
| 845 | return ret; |
| 846 | } |
| 847 | |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 848 | /* function to assist building execv() arguments */ |
Ben Lindstrom | 387c472 | 2001-05-08 20:27:25 +0000 | [diff] [blame] | 849 | void |
| 850 | addargs(arglist *args, char *fmt, ...) |
| 851 | { |
| 852 | va_list ap; |
Damien Miller | 3eec6b7 | 2006-01-31 21:49:27 +1100 | [diff] [blame] | 853 | char *cp; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 854 | u_int nalloc; |
Damien Miller | 3eec6b7 | 2006-01-31 21:49:27 +1100 | [diff] [blame] | 855 | int r; |
Ben Lindstrom | 387c472 | 2001-05-08 20:27:25 +0000 | [diff] [blame] | 856 | |
| 857 | va_start(ap, fmt); |
Damien Miller | 3eec6b7 | 2006-01-31 21:49:27 +1100 | [diff] [blame] | 858 | r = vasprintf(&cp, fmt, ap); |
Ben Lindstrom | 387c472 | 2001-05-08 20:27:25 +0000 | [diff] [blame] | 859 | va_end(ap); |
Damien Miller | 3eec6b7 | 2006-01-31 21:49:27 +1100 | [diff] [blame] | 860 | if (r == -1) |
| 861 | fatal("addargs: argument too long"); |
Ben Lindstrom | 387c472 | 2001-05-08 20:27:25 +0000 | [diff] [blame] | 862 | |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 863 | nalloc = args->nalloc; |
Ben Lindstrom | 387c472 | 2001-05-08 20:27:25 +0000 | [diff] [blame] | 864 | if (args->list == NULL) { |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 865 | nalloc = 32; |
Ben Lindstrom | 387c472 | 2001-05-08 20:27:25 +0000 | [diff] [blame] | 866 | args->num = 0; |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 867 | } else if (args->num+2 >= nalloc) |
| 868 | nalloc *= 2; |
Ben Lindstrom | 387c472 | 2001-05-08 20:27:25 +0000 | [diff] [blame] | 869 | |
deraadt@openbsd.org | 9e509d4 | 2017-05-31 09:15:42 +0000 | [diff] [blame] | 870 | args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *)); |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 871 | args->nalloc = nalloc; |
Damien Miller | 3eec6b7 | 2006-01-31 21:49:27 +1100 | [diff] [blame] | 872 | args->list[args->num++] = cp; |
Ben Lindstrom | 387c472 | 2001-05-08 20:27:25 +0000 | [diff] [blame] | 873 | args->list[args->num] = NULL; |
| 874 | } |
Darren Tucker | 22cc741 | 2004-12-06 22:47:41 +1100 | [diff] [blame] | 875 | |
Damien Miller | 3eec6b7 | 2006-01-31 21:49:27 +1100 | [diff] [blame] | 876 | void |
| 877 | replacearg(arglist *args, u_int which, char *fmt, ...) |
| 878 | { |
| 879 | va_list ap; |
| 880 | char *cp; |
| 881 | int r; |
| 882 | |
| 883 | va_start(ap, fmt); |
| 884 | r = vasprintf(&cp, fmt, ap); |
| 885 | va_end(ap); |
| 886 | if (r == -1) |
| 887 | fatal("replacearg: argument too long"); |
| 888 | |
| 889 | if (which >= args->num) |
| 890 | fatal("replacearg: tried to replace invalid arg %d >= %d", |
| 891 | which, args->num); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 892 | free(args->list[which]); |
Damien Miller | 3eec6b7 | 2006-01-31 21:49:27 +1100 | [diff] [blame] | 893 | args->list[which] = cp; |
| 894 | } |
| 895 | |
| 896 | void |
| 897 | freeargs(arglist *args) |
| 898 | { |
| 899 | u_int i; |
| 900 | |
| 901 | if (args->list != NULL) { |
| 902 | for (i = 0; i < args->num; i++) |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 903 | free(args->list[i]); |
| 904 | free(args->list); |
Damien Miller | 3eec6b7 | 2006-01-31 21:49:27 +1100 | [diff] [blame] | 905 | args->nalloc = args->num = 0; |
| 906 | args->list = NULL; |
| 907 | } |
| 908 | } |
| 909 | |
Darren Tucker | 22cc741 | 2004-12-06 22:47:41 +1100 | [diff] [blame] | 910 | /* |
Damien Miller | 5fd38c0 | 2005-05-26 12:02:14 +1000 | [diff] [blame] | 911 | * Expands tildes in the file name. Returns data allocated by xmalloc. |
| 912 | * Warning: this calls getpw*. |
| 913 | */ |
| 914 | char * |
| 915 | tilde_expand_filename(const char *filename, uid_t uid) |
| 916 | { |
Darren Tucker | 2ca51bf | 2013-05-16 20:22:46 +1000 | [diff] [blame] | 917 | const char *path, *sep; |
| 918 | char user[128], *ret; |
Damien Miller | 5fd38c0 | 2005-05-26 12:02:14 +1000 | [diff] [blame] | 919 | struct passwd *pw; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 920 | u_int len, slash; |
Damien Miller | 5fd38c0 | 2005-05-26 12:02:14 +1000 | [diff] [blame] | 921 | |
| 922 | if (*filename != '~') |
| 923 | return (xstrdup(filename)); |
| 924 | filename++; |
| 925 | |
| 926 | path = strchr(filename, '/'); |
| 927 | if (path != NULL && path > filename) { /* ~user/path */ |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 928 | slash = path - filename; |
| 929 | if (slash > sizeof(user) - 1) |
Damien Miller | 5fd38c0 | 2005-05-26 12:02:14 +1000 | [diff] [blame] | 930 | fatal("tilde_expand_filename: ~username too long"); |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 931 | memcpy(user, filename, slash); |
| 932 | user[slash] = '\0'; |
Damien Miller | 5fd38c0 | 2005-05-26 12:02:14 +1000 | [diff] [blame] | 933 | if ((pw = getpwnam(user)) == NULL) |
| 934 | fatal("tilde_expand_filename: No such user %s", user); |
| 935 | } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ |
Darren Tucker | 7517b5b | 2008-06-13 14:48:59 +1000 | [diff] [blame] | 936 | fatal("tilde_expand_filename: No such uid %ld", (long)uid); |
Damien Miller | 5fd38c0 | 2005-05-26 12:02:14 +1000 | [diff] [blame] | 937 | |
Damien Miller | 5fd38c0 | 2005-05-26 12:02:14 +1000 | [diff] [blame] | 938 | /* Make sure directory has a trailing '/' */ |
| 939 | len = strlen(pw->pw_dir); |
Darren Tucker | 026d9db | 2013-05-16 20:23:52 +1000 | [diff] [blame] | 940 | if (len == 0 || pw->pw_dir[len - 1] != '/') |
Darren Tucker | 2ca51bf | 2013-05-16 20:22:46 +1000 | [diff] [blame] | 941 | sep = "/"; |
| 942 | else |
| 943 | sep = ""; |
Damien Miller | 5fd38c0 | 2005-05-26 12:02:14 +1000 | [diff] [blame] | 944 | |
| 945 | /* Skip leading '/' from specified path */ |
| 946 | if (path != NULL) |
| 947 | filename = path + 1; |
Darren Tucker | 2ca51bf | 2013-05-16 20:22:46 +1000 | [diff] [blame] | 948 | |
deraadt@openbsd.org | 2ae4f33 | 2015-01-16 06:40:12 +0000 | [diff] [blame] | 949 | if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX) |
Damien Miller | 5fd38c0 | 2005-05-26 12:02:14 +1000 | [diff] [blame] | 950 | fatal("tilde_expand_filename: Path too long"); |
| 951 | |
Darren Tucker | 2ca51bf | 2013-05-16 20:22:46 +1000 | [diff] [blame] | 952 | return (ret); |
Damien Miller | 5fd38c0 | 2005-05-26 12:02:14 +1000 | [diff] [blame] | 953 | } |
| 954 | |
| 955 | /* |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 956 | * Expand a string with a set of %[char] escapes. A number of escapes may be |
| 957 | * specified as (char *escape_chars, char *replacement) pairs. The list must |
Darren Tucker | bee73d5 | 2005-07-14 17:05:02 +1000 | [diff] [blame] | 958 | * be terminated by a NULL escape_char. Returns replaced string in memory |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 959 | * allocated by xmalloc. |
| 960 | */ |
| 961 | char * |
| 962 | percent_expand(const char *string, ...) |
| 963 | { |
| 964 | #define EXPAND_MAX_KEYS 16 |
Darren Tucker | 70d8769 | 2010-01-08 18:49:16 +1100 | [diff] [blame] | 965 | u_int num_keys, i, j; |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 966 | struct { |
| 967 | const char *key; |
| 968 | const char *repl; |
| 969 | } keys[EXPAND_MAX_KEYS]; |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 970 | char buf[4096]; |
| 971 | va_list ap; |
| 972 | |
| 973 | /* Gather keys */ |
| 974 | va_start(ap, string); |
| 975 | for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { |
| 976 | keys[num_keys].key = va_arg(ap, char *); |
| 977 | if (keys[num_keys].key == NULL) |
| 978 | break; |
| 979 | keys[num_keys].repl = va_arg(ap, char *); |
| 980 | if (keys[num_keys].repl == NULL) |
Darren Tucker | 70d8769 | 2010-01-08 18:49:16 +1100 | [diff] [blame] | 981 | fatal("%s: NULL replacement", __func__); |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 982 | } |
Darren Tucker | 70d8769 | 2010-01-08 18:49:16 +1100 | [diff] [blame] | 983 | if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) |
| 984 | fatal("%s: too many keys", __func__); |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 985 | va_end(ap); |
| 986 | |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 987 | /* Expand string */ |
| 988 | *buf = '\0'; |
| 989 | for (i = 0; *string != '\0'; string++) { |
| 990 | if (*string != '%') { |
| 991 | append: |
| 992 | buf[i++] = *string; |
| 993 | if (i >= sizeof(buf)) |
Darren Tucker | 70d8769 | 2010-01-08 18:49:16 +1100 | [diff] [blame] | 994 | fatal("%s: string too long", __func__); |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 995 | buf[i] = '\0'; |
| 996 | continue; |
| 997 | } |
| 998 | string++; |
Darren Tucker | 70d8769 | 2010-01-08 18:49:16 +1100 | [diff] [blame] | 999 | /* %% case */ |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 1000 | if (*string == '%') |
| 1001 | goto append; |
tobias@openbsd.org | 8b56e59 | 2015-12-04 21:51:06 +0000 | [diff] [blame] | 1002 | if (*string == '\0') |
| 1003 | fatal("%s: invalid format", __func__); |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 1004 | for (j = 0; j < num_keys; j++) { |
| 1005 | if (strchr(keys[j].key, *string) != NULL) { |
| 1006 | i = strlcat(buf, keys[j].repl, sizeof(buf)); |
| 1007 | if (i >= sizeof(buf)) |
Darren Tucker | 70d8769 | 2010-01-08 18:49:16 +1100 | [diff] [blame] | 1008 | fatal("%s: string too long", __func__); |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 1009 | break; |
| 1010 | } |
| 1011 | } |
| 1012 | if (j >= num_keys) |
Darren Tucker | 70d8769 | 2010-01-08 18:49:16 +1100 | [diff] [blame] | 1013 | fatal("%s: unknown key %%%c", __func__, *string); |
Damien Miller | 6476cad | 2005-06-16 13:18:34 +1000 | [diff] [blame] | 1014 | } |
| 1015 | return (xstrdup(buf)); |
| 1016 | #undef EXPAND_MAX_KEYS |
| 1017 | } |
| 1018 | |
| 1019 | /* |
Darren Tucker | 22cc741 | 2004-12-06 22:47:41 +1100 | [diff] [blame] | 1020 | * Read an entire line from a public key file into a static buffer, discarding |
| 1021 | * lines that exceed the buffer size. Returns 0 on success, -1 on failure. |
| 1022 | */ |
| 1023 | int |
| 1024 | read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, |
Darren Tucker | f0f9098 | 2004-12-11 13:39:50 +1100 | [diff] [blame] | 1025 | u_long *lineno) |
Darren Tucker | 22cc741 | 2004-12-06 22:47:41 +1100 | [diff] [blame] | 1026 | { |
| 1027 | while (fgets(buf, bufsz, f) != NULL) { |
Damien Miller | 3ca8b77 | 2007-01-05 16:24:47 +1100 | [diff] [blame] | 1028 | if (buf[0] == '\0') |
| 1029 | continue; |
Darren Tucker | 22cc741 | 2004-12-06 22:47:41 +1100 | [diff] [blame] | 1030 | (*lineno)++; |
| 1031 | if (buf[strlen(buf) - 1] == '\n' || feof(f)) { |
| 1032 | return 0; |
| 1033 | } else { |
Darren Tucker | f0f9098 | 2004-12-11 13:39:50 +1100 | [diff] [blame] | 1034 | debug("%s: %s line %lu exceeds size limit", __func__, |
| 1035 | filename, *lineno); |
Darren Tucker | 22cc741 | 2004-12-06 22:47:41 +1100 | [diff] [blame] | 1036 | /* discard remainder of line */ |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 1037 | while (fgetc(f) != '\n' && !feof(f)) |
Darren Tucker | 22cc741 | 2004-12-06 22:47:41 +1100 | [diff] [blame] | 1038 | ; /* nothing */ |
| 1039 | } |
| 1040 | } |
| 1041 | return -1; |
| 1042 | } |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 1043 | |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1044 | int |
djm@openbsd.org | b7548b1 | 2017-10-23 05:08:00 +0000 | [diff] [blame] | 1045 | tun_open(int tun, int mode, char **ifname) |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1046 | { |
Damien Miller | 62a31c9 | 2005-12-13 20:44:13 +1100 | [diff] [blame] | 1047 | #if defined(CUSTOM_SYS_TUN_OPEN) |
djm@openbsd.org | b7548b1 | 2017-10-23 05:08:00 +0000 | [diff] [blame] | 1048 | return (sys_tun_open(tun, mode, ifname)); |
Damien Miller | 2dcddbf | 2006-01-01 19:47:05 +1100 | [diff] [blame] | 1049 | #elif defined(SSH_TUN_OPENBSD) |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1050 | struct ifreq ifr; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1051 | char name[100]; |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1052 | int fd = -1, sock; |
sthen@openbsd.org | a820a86 | 2015-10-24 08:34:09 +0000 | [diff] [blame] | 1053 | const char *tunbase = "tun"; |
| 1054 | |
djm@openbsd.org | b7548b1 | 2017-10-23 05:08:00 +0000 | [diff] [blame] | 1055 | if (ifname != NULL) |
| 1056 | *ifname = NULL; |
| 1057 | |
sthen@openbsd.org | a820a86 | 2015-10-24 08:34:09 +0000 | [diff] [blame] | 1058 | if (mode == SSH_TUNMODE_ETHERNET) |
| 1059 | tunbase = "tap"; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1060 | |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1061 | /* Open the tunnel device */ |
| 1062 | if (tun <= SSH_TUNID_MAX) { |
sthen@openbsd.org | a820a86 | 2015-10-24 08:34:09 +0000 | [diff] [blame] | 1063 | snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1064 | fd = open(name, O_RDWR); |
| 1065 | } else if (tun == SSH_TUNID_ANY) { |
| 1066 | for (tun = 100; tun >= 0; tun--) { |
sthen@openbsd.org | a820a86 | 2015-10-24 08:34:09 +0000 | [diff] [blame] | 1067 | snprintf(name, sizeof(name), "/dev/%s%d", |
| 1068 | tunbase, tun); |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1069 | if ((fd = open(name, O_RDWR)) >= 0) |
| 1070 | break; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1071 | } |
| 1072 | } else { |
Damien Miller | a210d52 | 2006-01-02 23:40:30 +1100 | [diff] [blame] | 1073 | debug("%s: invalid tunnel %u", __func__, tun); |
djm@openbsd.org | 2905d6f | 2015-10-07 00:54:06 +0000 | [diff] [blame] | 1074 | return -1; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1075 | } |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1076 | |
| 1077 | if (fd < 0) { |
djm@openbsd.org | 2905d6f | 2015-10-07 00:54:06 +0000 | [diff] [blame] | 1078 | debug("%s: %s open: %s", __func__, name, strerror(errno)); |
| 1079 | return -1; |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | debug("%s: %s mode %d fd %d", __func__, name, mode, fd); |
| 1083 | |
sthen@openbsd.org | a820a86 | 2015-10-24 08:34:09 +0000 | [diff] [blame] | 1084 | /* Bring interface up if it is not already */ |
| 1085 | snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); |
| 1086 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1087 | goto failed; |
| 1088 | |
djm@openbsd.org | 2905d6f | 2015-10-07 00:54:06 +0000 | [diff] [blame] | 1089 | if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) { |
| 1090 | debug("%s: get interface %s flags: %s", __func__, |
| 1091 | ifr.ifr_name, strerror(errno)); |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1092 | goto failed; |
djm@openbsd.org | 2905d6f | 2015-10-07 00:54:06 +0000 | [diff] [blame] | 1093 | } |
Damien Miller | a1d9a18 | 2006-01-02 23:41:21 +1100 | [diff] [blame] | 1094 | |
djm@openbsd.org | 2905d6f | 2015-10-07 00:54:06 +0000 | [diff] [blame] | 1095 | if (!(ifr.ifr_flags & IFF_UP)) { |
| 1096 | ifr.ifr_flags |= IFF_UP; |
| 1097 | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) { |
| 1098 | debug("%s: activate interface %s: %s", __func__, |
| 1099 | ifr.ifr_name, strerror(errno)); |
| 1100 | goto failed; |
| 1101 | } |
| 1102 | } |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1103 | |
djm@openbsd.org | b7548b1 | 2017-10-23 05:08:00 +0000 | [diff] [blame] | 1104 | if (ifname != NULL) |
| 1105 | *ifname = xstrdup(ifr.ifr_name); |
| 1106 | |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1107 | close(sock); |
djm@openbsd.org | 2905d6f | 2015-10-07 00:54:06 +0000 | [diff] [blame] | 1108 | return fd; |
Damien Miller | 7b58e80 | 2005-12-13 19:33:19 +1100 | [diff] [blame] | 1109 | |
| 1110 | failed: |
| 1111 | if (fd >= 0) |
| 1112 | close(fd); |
| 1113 | if (sock >= 0) |
| 1114 | close(sock); |
djm@openbsd.org | 2905d6f | 2015-10-07 00:54:06 +0000 | [diff] [blame] | 1115 | return -1; |
Damien Miller | 62a31c9 | 2005-12-13 20:44:13 +1100 | [diff] [blame] | 1116 | #else |
| 1117 | error("Tunnel interfaces are not supported on this platform"); |
| 1118 | return (-1); |
| 1119 | #endif |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1120 | } |
| 1121 | |
Darren Tucker | ce321d8 | 2005-10-03 18:11:24 +1000 | [diff] [blame] | 1122 | void |
| 1123 | sanitise_stdfd(void) |
| 1124 | { |
Damien Miller | 72c5b7d | 2006-01-06 14:50:44 +1100 | [diff] [blame] | 1125 | int nullfd, dupfd; |
Darren Tucker | ce321d8 | 2005-10-03 18:11:24 +1000 | [diff] [blame] | 1126 | |
Damien Miller | 72c5b7d | 2006-01-06 14:50:44 +1100 | [diff] [blame] | 1127 | if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { |
Damien Miller | 9eab956 | 2009-02-22 08:47:02 +1100 | [diff] [blame] | 1128 | fprintf(stderr, "Couldn't open /dev/null: %s\n", |
| 1129 | strerror(errno)); |
Darren Tucker | ce321d8 | 2005-10-03 18:11:24 +1000 | [diff] [blame] | 1130 | exit(1); |
| 1131 | } |
krw@openbsd.org | 574def0 | 2016-04-02 14:37:42 +0000 | [diff] [blame] | 1132 | while (++dupfd <= STDERR_FILENO) { |
| 1133 | /* Only populate closed fds. */ |
| 1134 | if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) { |
| 1135 | if (dup2(nullfd, dupfd) == -1) { |
| 1136 | fprintf(stderr, "dup2: %s\n", strerror(errno)); |
| 1137 | exit(1); |
| 1138 | } |
Darren Tucker | ce321d8 | 2005-10-03 18:11:24 +1000 | [diff] [blame] | 1139 | } |
Darren Tucker | ce321d8 | 2005-10-03 18:11:24 +1000 | [diff] [blame] | 1140 | } |
krw@openbsd.org | 574def0 | 2016-04-02 14:37:42 +0000 | [diff] [blame] | 1141 | if (nullfd > STDERR_FILENO) |
Darren Tucker | ce321d8 | 2005-10-03 18:11:24 +1000 | [diff] [blame] | 1142 | close(nullfd); |
| 1143 | } |
| 1144 | |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 1145 | char * |
Damien Miller | 3f94188 | 2006-03-31 23:13:02 +1100 | [diff] [blame] | 1146 | tohex(const void *vp, size_t l) |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 1147 | { |
Damien Miller | 3f94188 | 2006-03-31 23:13:02 +1100 | [diff] [blame] | 1148 | const u_char *p = (const u_char *)vp; |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 1149 | char b[3], *r; |
Damien Miller | 3f94188 | 2006-03-31 23:13:02 +1100 | [diff] [blame] | 1150 | size_t i, hl; |
| 1151 | |
| 1152 | if (l > 65536) |
| 1153 | return xstrdup("tohex: length > 65536"); |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 1154 | |
| 1155 | hl = l * 2 + 1; |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 1156 | r = xcalloc(1, hl); |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 1157 | for (i = 0; i < l; i++) { |
Damien Miller | 3f94188 | 2006-03-31 23:13:02 +1100 | [diff] [blame] | 1158 | snprintf(b, sizeof(b), "%02x", p[i]); |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 1159 | strlcat(r, b, hl); |
| 1160 | } |
| 1161 | return (r); |
| 1162 | } |
| 1163 | |
Damien Miller | 3f94188 | 2006-03-31 23:13:02 +1100 | [diff] [blame] | 1164 | u_int64_t |
| 1165 | get_u64(const void *vp) |
| 1166 | { |
| 1167 | const u_char *p = (const u_char *)vp; |
| 1168 | u_int64_t v; |
| 1169 | |
| 1170 | v = (u_int64_t)p[0] << 56; |
| 1171 | v |= (u_int64_t)p[1] << 48; |
| 1172 | v |= (u_int64_t)p[2] << 40; |
| 1173 | v |= (u_int64_t)p[3] << 32; |
| 1174 | v |= (u_int64_t)p[4] << 24; |
| 1175 | v |= (u_int64_t)p[5] << 16; |
| 1176 | v |= (u_int64_t)p[6] << 8; |
| 1177 | v |= (u_int64_t)p[7]; |
| 1178 | |
| 1179 | return (v); |
| 1180 | } |
| 1181 | |
| 1182 | u_int32_t |
| 1183 | get_u32(const void *vp) |
| 1184 | { |
| 1185 | const u_char *p = (const u_char *)vp; |
| 1186 | u_int32_t v; |
| 1187 | |
| 1188 | v = (u_int32_t)p[0] << 24; |
| 1189 | v |= (u_int32_t)p[1] << 16; |
| 1190 | v |= (u_int32_t)p[2] << 8; |
| 1191 | v |= (u_int32_t)p[3]; |
| 1192 | |
| 1193 | return (v); |
| 1194 | } |
| 1195 | |
Damien Miller | 8885669 | 2014-04-20 13:33:19 +1000 | [diff] [blame] | 1196 | u_int32_t |
| 1197 | get_u32_le(const void *vp) |
| 1198 | { |
| 1199 | const u_char *p = (const u_char *)vp; |
| 1200 | u_int32_t v; |
| 1201 | |
| 1202 | v = (u_int32_t)p[0]; |
| 1203 | v |= (u_int32_t)p[1] << 8; |
| 1204 | v |= (u_int32_t)p[2] << 16; |
| 1205 | v |= (u_int32_t)p[3] << 24; |
| 1206 | |
| 1207 | return (v); |
| 1208 | } |
| 1209 | |
Damien Miller | 3f94188 | 2006-03-31 23:13:02 +1100 | [diff] [blame] | 1210 | u_int16_t |
| 1211 | get_u16(const void *vp) |
| 1212 | { |
| 1213 | const u_char *p = (const u_char *)vp; |
| 1214 | u_int16_t v; |
| 1215 | |
| 1216 | v = (u_int16_t)p[0] << 8; |
| 1217 | v |= (u_int16_t)p[1]; |
| 1218 | |
| 1219 | return (v); |
| 1220 | } |
| 1221 | |
| 1222 | void |
| 1223 | put_u64(void *vp, u_int64_t v) |
| 1224 | { |
| 1225 | u_char *p = (u_char *)vp; |
| 1226 | |
| 1227 | p[0] = (u_char)(v >> 56) & 0xff; |
| 1228 | p[1] = (u_char)(v >> 48) & 0xff; |
| 1229 | p[2] = (u_char)(v >> 40) & 0xff; |
| 1230 | p[3] = (u_char)(v >> 32) & 0xff; |
| 1231 | p[4] = (u_char)(v >> 24) & 0xff; |
| 1232 | p[5] = (u_char)(v >> 16) & 0xff; |
| 1233 | p[6] = (u_char)(v >> 8) & 0xff; |
| 1234 | p[7] = (u_char)v & 0xff; |
| 1235 | } |
| 1236 | |
| 1237 | void |
| 1238 | put_u32(void *vp, u_int32_t v) |
| 1239 | { |
| 1240 | u_char *p = (u_char *)vp; |
| 1241 | |
| 1242 | p[0] = (u_char)(v >> 24) & 0xff; |
| 1243 | p[1] = (u_char)(v >> 16) & 0xff; |
| 1244 | p[2] = (u_char)(v >> 8) & 0xff; |
| 1245 | p[3] = (u_char)v & 0xff; |
| 1246 | } |
| 1247 | |
Damien Miller | 8885669 | 2014-04-20 13:33:19 +1000 | [diff] [blame] | 1248 | void |
| 1249 | put_u32_le(void *vp, u_int32_t v) |
| 1250 | { |
| 1251 | u_char *p = (u_char *)vp; |
| 1252 | |
| 1253 | p[0] = (u_char)v & 0xff; |
| 1254 | p[1] = (u_char)(v >> 8) & 0xff; |
| 1255 | p[2] = (u_char)(v >> 16) & 0xff; |
| 1256 | p[3] = (u_char)(v >> 24) & 0xff; |
| 1257 | } |
Damien Miller | 3f94188 | 2006-03-31 23:13:02 +1100 | [diff] [blame] | 1258 | |
| 1259 | void |
| 1260 | put_u16(void *vp, u_int16_t v) |
| 1261 | { |
| 1262 | u_char *p = (u_char *)vp; |
| 1263 | |
| 1264 | p[0] = (u_char)(v >> 8) & 0xff; |
| 1265 | p[1] = (u_char)v & 0xff; |
| 1266 | } |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1267 | |
| 1268 | void |
| 1269 | ms_subtract_diff(struct timeval *start, int *ms) |
| 1270 | { |
| 1271 | struct timeval diff, finish; |
| 1272 | |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1273 | monotime_tv(&finish); |
| 1274 | timersub(&finish, start, &diff); |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1275 | *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); |
| 1276 | } |
| 1277 | |
| 1278 | void |
| 1279 | ms_to_timeval(struct timeval *tv, int ms) |
| 1280 | { |
| 1281 | if (ms < 0) |
| 1282 | ms = 0; |
| 1283 | tv->tv_sec = ms / 1000; |
| 1284 | tv->tv_usec = (ms % 1000) * 1000; |
| 1285 | } |
| 1286 | |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1287 | void |
| 1288 | monotime_ts(struct timespec *ts) |
Darren Tucker | b759c9c | 2013-06-02 07:46:16 +1000 | [diff] [blame] | 1289 | { |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1290 | struct timeval tv; |
| 1291 | #if defined(HAVE_CLOCK_GETTIME) && (defined(CLOCK_BOOTTIME) || \ |
| 1292 | defined(CLOCK_MONOTONIC) || defined(CLOCK_REALTIME)) |
Darren Tucker | 94396b7 | 2013-08-08 11:52:37 +1000 | [diff] [blame] | 1293 | static int gettime_failed = 0; |
Darren Tucker | b759c9c | 2013-06-02 07:46:16 +1000 | [diff] [blame] | 1294 | |
Darren Tucker | 94396b7 | 2013-08-08 11:52:37 +1000 | [diff] [blame] | 1295 | if (!gettime_failed) { |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1296 | # ifdef CLOCK_BOOTTIME |
| 1297 | if (clock_gettime(CLOCK_BOOTTIME, ts) == 0) |
| 1298 | return; |
| 1299 | # endif /* CLOCK_BOOTTIME */ |
| 1300 | # ifdef CLOCK_MONOTONIC |
| 1301 | if (clock_gettime(CLOCK_MONOTONIC, ts) == 0) |
| 1302 | return; |
| 1303 | # endif /* CLOCK_MONOTONIC */ |
| 1304 | # ifdef CLOCK_REALTIME |
| 1305 | /* Not monotonic, but we're almost out of options here. */ |
| 1306 | if (clock_gettime(CLOCK_REALTIME, ts) == 0) |
| 1307 | return; |
| 1308 | # endif /* CLOCK_REALTIME */ |
Darren Tucker | 94396b7 | 2013-08-08 11:52:37 +1000 | [diff] [blame] | 1309 | debug3("clock_gettime: %s", strerror(errno)); |
| 1310 | gettime_failed = 1; |
| 1311 | } |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1312 | #endif /* HAVE_CLOCK_GETTIME && (BOOTTIME || MONOTONIC || REALTIME) */ |
| 1313 | gettimeofday(&tv, NULL); |
| 1314 | ts->tv_sec = tv.tv_sec; |
| 1315 | ts->tv_nsec = (long)tv.tv_usec * 1000; |
| 1316 | } |
Darren Tucker | 94396b7 | 2013-08-08 11:52:37 +1000 | [diff] [blame] | 1317 | |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1318 | void |
| 1319 | monotime_tv(struct timeval *tv) |
| 1320 | { |
| 1321 | struct timespec ts; |
| 1322 | |
| 1323 | monotime_ts(&ts); |
| 1324 | tv->tv_sec = ts.tv_sec; |
| 1325 | tv->tv_usec = ts.tv_nsec / 1000; |
| 1326 | } |
| 1327 | |
| 1328 | time_t |
| 1329 | monotime(void) |
| 1330 | { |
| 1331 | struct timespec ts; |
| 1332 | |
| 1333 | monotime_ts(&ts); |
| 1334 | return ts.tv_sec; |
Darren Tucker | b759c9c | 2013-06-02 07:46:16 +1000 | [diff] [blame] | 1335 | } |
| 1336 | |
dtucker@openbsd.org | b8d4eaf | 2016-03-02 22:42:40 +0000 | [diff] [blame] | 1337 | double |
| 1338 | monotime_double(void) |
| 1339 | { |
| 1340 | struct timespec ts; |
| 1341 | |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1342 | monotime_ts(&ts); |
| 1343 | return ts.tv_sec + ((double)ts.tv_nsec / 1000000000); |
dtucker@openbsd.org | b8d4eaf | 2016-03-02 22:42:40 +0000 | [diff] [blame] | 1344 | } |
| 1345 | |
Damien Miller | 65e42f8 | 2010-09-24 22:15:11 +1000 | [diff] [blame] | 1346 | void |
| 1347 | bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) |
| 1348 | { |
| 1349 | bw->buflen = buflen; |
| 1350 | bw->rate = kbps; |
| 1351 | bw->thresh = bw->rate; |
| 1352 | bw->lamt = 0; |
| 1353 | timerclear(&bw->bwstart); |
| 1354 | timerclear(&bw->bwend); |
| 1355 | } |
| 1356 | |
| 1357 | /* Callback from read/write loop to insert bandwidth-limiting delays */ |
| 1358 | void |
| 1359 | bandwidth_limit(struct bwlimit *bw, size_t read_len) |
| 1360 | { |
| 1361 | u_int64_t waitlen; |
| 1362 | struct timespec ts, rm; |
| 1363 | |
| 1364 | if (!timerisset(&bw->bwstart)) { |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1365 | monotime_tv(&bw->bwstart); |
Damien Miller | 65e42f8 | 2010-09-24 22:15:11 +1000 | [diff] [blame] | 1366 | return; |
| 1367 | } |
| 1368 | |
| 1369 | bw->lamt += read_len; |
| 1370 | if (bw->lamt < bw->thresh) |
| 1371 | return; |
| 1372 | |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1373 | monotime_tv(&bw->bwend); |
Damien Miller | 65e42f8 | 2010-09-24 22:15:11 +1000 | [diff] [blame] | 1374 | timersub(&bw->bwend, &bw->bwstart, &bw->bwend); |
| 1375 | if (!timerisset(&bw->bwend)) |
| 1376 | return; |
| 1377 | |
| 1378 | bw->lamt *= 8; |
| 1379 | waitlen = (double)1000000L * bw->lamt / bw->rate; |
| 1380 | |
| 1381 | bw->bwstart.tv_sec = waitlen / 1000000L; |
| 1382 | bw->bwstart.tv_usec = waitlen % 1000000L; |
| 1383 | |
| 1384 | if (timercmp(&bw->bwstart, &bw->bwend, >)) { |
| 1385 | timersub(&bw->bwstart, &bw->bwend, &bw->bwend); |
| 1386 | |
| 1387 | /* Adjust the wait time */ |
| 1388 | if (bw->bwend.tv_sec) { |
| 1389 | bw->thresh /= 2; |
| 1390 | if (bw->thresh < bw->buflen / 4) |
| 1391 | bw->thresh = bw->buflen / 4; |
| 1392 | } else if (bw->bwend.tv_usec < 10000) { |
| 1393 | bw->thresh *= 2; |
| 1394 | if (bw->thresh > bw->buflen * 8) |
| 1395 | bw->thresh = bw->buflen * 8; |
| 1396 | } |
| 1397 | |
| 1398 | TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); |
| 1399 | while (nanosleep(&ts, &rm) == -1) { |
| 1400 | if (errno != EINTR) |
| 1401 | break; |
| 1402 | ts = rm; |
| 1403 | } |
| 1404 | } |
| 1405 | |
| 1406 | bw->lamt = 0; |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1407 | monotime_tv(&bw->bwstart); |
Damien Miller | 65e42f8 | 2010-09-24 22:15:11 +1000 | [diff] [blame] | 1408 | } |
Damien Miller | 0dac6fb | 2010-11-20 15:19:38 +1100 | [diff] [blame] | 1409 | |
Damien Miller | 2cd6293 | 2010-12-01 11:50:35 +1100 | [diff] [blame] | 1410 | /* Make a template filename for mk[sd]temp() */ |
| 1411 | void |
| 1412 | mktemp_proto(char *s, size_t len) |
| 1413 | { |
| 1414 | const char *tmpdir; |
| 1415 | int r; |
| 1416 | |
| 1417 | if ((tmpdir = getenv("TMPDIR")) != NULL) { |
| 1418 | r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); |
| 1419 | if (r > 0 && (size_t)r < len) |
| 1420 | return; |
| 1421 | } |
| 1422 | r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); |
| 1423 | if (r < 0 || (size_t)r >= len) |
| 1424 | fatal("%s: template string too short", __func__); |
| 1425 | } |
| 1426 | |
Damien Miller | 0dac6fb | 2010-11-20 15:19:38 +1100 | [diff] [blame] | 1427 | static const struct { |
| 1428 | const char *name; |
| 1429 | int value; |
| 1430 | } ipqos[] = { |
djm@openbsd.org | 51676ec | 2017-07-23 23:37:02 +0000 | [diff] [blame] | 1431 | { "none", INT_MAX }, /* can't use 0 here; that's CS0 */ |
Damien Miller | 0dac6fb | 2010-11-20 15:19:38 +1100 | [diff] [blame] | 1432 | { "af11", IPTOS_DSCP_AF11 }, |
| 1433 | { "af12", IPTOS_DSCP_AF12 }, |
| 1434 | { "af13", IPTOS_DSCP_AF13 }, |
Damien Miller | 2918e03 | 2011-09-22 21:34:35 +1000 | [diff] [blame] | 1435 | { "af21", IPTOS_DSCP_AF21 }, |
Damien Miller | 0dac6fb | 2010-11-20 15:19:38 +1100 | [diff] [blame] | 1436 | { "af22", IPTOS_DSCP_AF22 }, |
| 1437 | { "af23", IPTOS_DSCP_AF23 }, |
| 1438 | { "af31", IPTOS_DSCP_AF31 }, |
| 1439 | { "af32", IPTOS_DSCP_AF32 }, |
| 1440 | { "af33", IPTOS_DSCP_AF33 }, |
| 1441 | { "af41", IPTOS_DSCP_AF41 }, |
| 1442 | { "af42", IPTOS_DSCP_AF42 }, |
| 1443 | { "af43", IPTOS_DSCP_AF43 }, |
| 1444 | { "cs0", IPTOS_DSCP_CS0 }, |
| 1445 | { "cs1", IPTOS_DSCP_CS1 }, |
| 1446 | { "cs2", IPTOS_DSCP_CS2 }, |
| 1447 | { "cs3", IPTOS_DSCP_CS3 }, |
| 1448 | { "cs4", IPTOS_DSCP_CS4 }, |
| 1449 | { "cs5", IPTOS_DSCP_CS5 }, |
| 1450 | { "cs6", IPTOS_DSCP_CS6 }, |
| 1451 | { "cs7", IPTOS_DSCP_CS7 }, |
| 1452 | { "ef", IPTOS_DSCP_EF }, |
| 1453 | { "lowdelay", IPTOS_LOWDELAY }, |
| 1454 | { "throughput", IPTOS_THROUGHPUT }, |
| 1455 | { "reliability", IPTOS_RELIABILITY }, |
| 1456 | { NULL, -1 } |
| 1457 | }; |
| 1458 | |
| 1459 | int |
| 1460 | parse_ipqos(const char *cp) |
| 1461 | { |
| 1462 | u_int i; |
| 1463 | char *ep; |
| 1464 | long val; |
| 1465 | |
| 1466 | if (cp == NULL) |
| 1467 | return -1; |
| 1468 | for (i = 0; ipqos[i].name != NULL; i++) { |
| 1469 | if (strcasecmp(cp, ipqos[i].name) == 0) |
| 1470 | return ipqos[i].value; |
| 1471 | } |
| 1472 | /* Try parsing as an integer */ |
| 1473 | val = strtol(cp, &ep, 0); |
| 1474 | if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) |
| 1475 | return -1; |
| 1476 | return val; |
| 1477 | } |
| 1478 | |
Damien Miller | 9147586 | 2011-05-05 14:14:34 +1000 | [diff] [blame] | 1479 | const char * |
| 1480 | iptos2str(int iptos) |
| 1481 | { |
| 1482 | int i; |
| 1483 | static char iptos_str[sizeof "0xff"]; |
| 1484 | |
| 1485 | for (i = 0; ipqos[i].name != NULL; i++) { |
| 1486 | if (ipqos[i].value == iptos) |
| 1487 | return ipqos[i].name; |
| 1488 | } |
| 1489 | snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); |
| 1490 | return iptos_str; |
| 1491 | } |
Damien Miller | e9fc72e | 2013-10-15 12:14:12 +1100 | [diff] [blame] | 1492 | |
| 1493 | void |
| 1494 | lowercase(char *s) |
| 1495 | { |
| 1496 | for (; *s; s++) |
| 1497 | *s = tolower((u_char)*s); |
| 1498 | } |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1499 | |
| 1500 | int |
| 1501 | unix_listener(const char *path, int backlog, int unlink_first) |
| 1502 | { |
| 1503 | struct sockaddr_un sunaddr; |
| 1504 | int saved_errno, sock; |
| 1505 | |
| 1506 | memset(&sunaddr, 0, sizeof(sunaddr)); |
| 1507 | sunaddr.sun_family = AF_UNIX; |
djm@openbsd.org | 155072f | 2017-12-08 02:13:02 +0000 | [diff] [blame] | 1508 | if (strlcpy(sunaddr.sun_path, path, |
| 1509 | sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { |
| 1510 | error("%s: path \"%s\" too long for Unix domain socket", |
| 1511 | __func__, path); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1512 | errno = ENAMETOOLONG; |
| 1513 | return -1; |
| 1514 | } |
| 1515 | |
| 1516 | sock = socket(PF_UNIX, SOCK_STREAM, 0); |
| 1517 | if (sock < 0) { |
| 1518 | saved_errno = errno; |
djm@openbsd.org | 155072f | 2017-12-08 02:13:02 +0000 | [diff] [blame] | 1519 | error("%s: socket: %.100s", __func__, strerror(errno)); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1520 | errno = saved_errno; |
| 1521 | return -1; |
| 1522 | } |
| 1523 | if (unlink_first == 1) { |
| 1524 | if (unlink(path) != 0 && errno != ENOENT) |
| 1525 | error("unlink(%s): %.100s", path, strerror(errno)); |
| 1526 | } |
| 1527 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) { |
| 1528 | saved_errno = errno; |
djm@openbsd.org | 155072f | 2017-12-08 02:13:02 +0000 | [diff] [blame] | 1529 | error("%s: cannot bind to path %s: %s", |
| 1530 | __func__, path, strerror(errno)); |
djm@openbsd.org | fd4eeee | 2017-12-08 02:14:33 +0000 | [diff] [blame] | 1531 | close(sock); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1532 | errno = saved_errno; |
| 1533 | return -1; |
| 1534 | } |
| 1535 | if (listen(sock, backlog) < 0) { |
| 1536 | saved_errno = errno; |
djm@openbsd.org | 155072f | 2017-12-08 02:13:02 +0000 | [diff] [blame] | 1537 | error("%s: cannot listen on path %s: %s", |
| 1538 | __func__, path, strerror(errno)); |
djm@openbsd.org | fd4eeee | 2017-12-08 02:14:33 +0000 | [diff] [blame] | 1539 | close(sock); |
| 1540 | unlink(path); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1541 | errno = saved_errno; |
| 1542 | return -1; |
| 1543 | } |
| 1544 | return sock; |
| 1545 | } |
Damien Miller | 4687802 | 2014-08-30 03:29:19 +1000 | [diff] [blame] | 1546 | |
Damien Miller | 04ee0f8 | 2009-11-18 17:48:30 +1100 | [diff] [blame] | 1547 | void |
| 1548 | sock_set_v6only(int s) |
| 1549 | { |
Damien Miller | d86a3ba | 2015-12-09 09:18:45 +1100 | [diff] [blame] | 1550 | #if defined(IPV6_V6ONLY) && !defined(__OpenBSD__) |
Damien Miller | 04ee0f8 | 2009-11-18 17:48:30 +1100 | [diff] [blame] | 1551 | int on = 1; |
| 1552 | |
| 1553 | debug3("%s: set socket %d IPV6_V6ONLY", __func__, s); |
| 1554 | if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1) |
| 1555 | error("setsockopt IPV6_V6ONLY: %s", strerror(errno)); |
| 1556 | #endif |
| 1557 | } |
djm@openbsd.org | 0ccbd5e | 2016-04-06 06:42:17 +0000 | [diff] [blame] | 1558 | |
| 1559 | /* |
| 1560 | * Compares two strings that maybe be NULL. Returns non-zero if strings |
| 1561 | * are both NULL or are identical, returns zero otherwise. |
| 1562 | */ |
| 1563 | static int |
| 1564 | strcmp_maybe_null(const char *a, const char *b) |
| 1565 | { |
| 1566 | if ((a == NULL && b != NULL) || (a != NULL && b == NULL)) |
| 1567 | return 0; |
| 1568 | if (a != NULL && strcmp(a, b) != 0) |
| 1569 | return 0; |
| 1570 | return 1; |
| 1571 | } |
| 1572 | |
| 1573 | /* |
| 1574 | * Compare two forwards, returning non-zero if they are identical or |
| 1575 | * zero otherwise. |
| 1576 | */ |
| 1577 | int |
| 1578 | forward_equals(const struct Forward *a, const struct Forward *b) |
| 1579 | { |
| 1580 | if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0) |
| 1581 | return 0; |
| 1582 | if (a->listen_port != b->listen_port) |
| 1583 | return 0; |
| 1584 | if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0) |
| 1585 | return 0; |
| 1586 | if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0) |
| 1587 | return 0; |
| 1588 | if (a->connect_port != b->connect_port) |
| 1589 | return 0; |
| 1590 | if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0) |
| 1591 | return 0; |
| 1592 | /* allocated_port and handle are not checked */ |
| 1593 | return 1; |
| 1594 | } |
| 1595 | |
dtucker@openbsd.org | 1c4ef0b | 2016-10-23 22:04:05 +0000 | [diff] [blame] | 1596 | /* returns 1 if bind to specified port by specified user is permitted */ |
| 1597 | int |
| 1598 | bind_permitted(int port, uid_t uid) |
| 1599 | { |
| 1600 | if (port < IPPORT_RESERVED && uid != 0) |
| 1601 | return 0; |
| 1602 | return 1; |
| 1603 | } |
dtucker@openbsd.org | 7fc4766 | 2016-11-30 00:28:31 +0000 | [diff] [blame] | 1604 | |
| 1605 | /* returns 1 if process is already daemonized, 0 otherwise */ |
| 1606 | int |
| 1607 | daemonized(void) |
| 1608 | { |
| 1609 | int fd; |
| 1610 | |
| 1611 | if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) { |
| 1612 | close(fd); |
| 1613 | return 0; /* have controlling terminal */ |
| 1614 | } |
| 1615 | if (getppid() != 1) |
| 1616 | return 0; /* parent is not init */ |
| 1617 | if (getsid(0) != getpid()) |
| 1618 | return 0; /* not session leader */ |
| 1619 | debug3("already daemonized"); |
| 1620 | return 1; |
| 1621 | } |
djm@openbsd.org | de4ae07 | 2017-08-18 05:36:45 +0000 | [diff] [blame] | 1622 | |
| 1623 | |
| 1624 | /* |
| 1625 | * Splits 's' into an argument vector. Handles quoted string and basic |
| 1626 | * escape characters (\\, \", \'). Caller must free the argument vector |
| 1627 | * and its members. |
| 1628 | */ |
| 1629 | int |
| 1630 | argv_split(const char *s, int *argcp, char ***argvp) |
| 1631 | { |
| 1632 | int r = SSH_ERR_INTERNAL_ERROR; |
| 1633 | int argc = 0, quote, i, j; |
| 1634 | char *arg, **argv = xcalloc(1, sizeof(*argv)); |
| 1635 | |
| 1636 | *argvp = NULL; |
| 1637 | *argcp = 0; |
| 1638 | |
| 1639 | for (i = 0; s[i] != '\0'; i++) { |
| 1640 | /* Skip leading whitespace */ |
| 1641 | if (s[i] == ' ' || s[i] == '\t') |
| 1642 | continue; |
| 1643 | |
| 1644 | /* Start of a token */ |
| 1645 | quote = 0; |
| 1646 | if (s[i] == '\\' && |
| 1647 | (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\')) |
| 1648 | i++; |
| 1649 | else if (s[i] == '\'' || s[i] == '"') |
| 1650 | quote = s[i++]; |
| 1651 | |
| 1652 | argv = xreallocarray(argv, (argc + 2), sizeof(*argv)); |
| 1653 | arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1); |
| 1654 | argv[argc] = NULL; |
| 1655 | |
| 1656 | /* Copy the token in, removing escapes */ |
| 1657 | for (j = 0; s[i] != '\0'; i++) { |
| 1658 | if (s[i] == '\\') { |
| 1659 | if (s[i + 1] == '\'' || |
| 1660 | s[i + 1] == '\"' || |
| 1661 | s[i + 1] == '\\') { |
| 1662 | i++; /* Skip '\' */ |
| 1663 | arg[j++] = s[i]; |
| 1664 | } else { |
| 1665 | /* Unrecognised escape */ |
| 1666 | arg[j++] = s[i]; |
| 1667 | } |
| 1668 | } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t')) |
| 1669 | break; /* done */ |
| 1670 | else if (quote != 0 && s[i] == quote) |
| 1671 | break; /* done */ |
| 1672 | else |
| 1673 | arg[j++] = s[i]; |
| 1674 | } |
| 1675 | if (s[i] == '\0') { |
| 1676 | if (quote != 0) { |
| 1677 | /* Ran out of string looking for close quote */ |
| 1678 | r = SSH_ERR_INVALID_FORMAT; |
| 1679 | goto out; |
| 1680 | } |
| 1681 | break; |
| 1682 | } |
| 1683 | } |
| 1684 | /* Success */ |
| 1685 | *argcp = argc; |
| 1686 | *argvp = argv; |
| 1687 | argc = 0; |
| 1688 | argv = NULL; |
| 1689 | r = 0; |
| 1690 | out: |
| 1691 | if (argc != 0 && argv != NULL) { |
| 1692 | for (i = 0; i < argc; i++) |
| 1693 | free(argv[i]); |
| 1694 | free(argv); |
| 1695 | } |
| 1696 | return r; |
| 1697 | } |
| 1698 | |
| 1699 | /* |
| 1700 | * Reassemble an argument vector into a string, quoting and escaping as |
| 1701 | * necessary. Caller must free returned string. |
| 1702 | */ |
| 1703 | char * |
| 1704 | argv_assemble(int argc, char **argv) |
| 1705 | { |
| 1706 | int i, j, ws, r; |
| 1707 | char c, *ret; |
| 1708 | struct sshbuf *buf, *arg; |
| 1709 | |
| 1710 | if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL) |
| 1711 | fatal("%s: sshbuf_new failed", __func__); |
| 1712 | |
| 1713 | for (i = 0; i < argc; i++) { |
| 1714 | ws = 0; |
| 1715 | sshbuf_reset(arg); |
| 1716 | for (j = 0; argv[i][j] != '\0'; j++) { |
| 1717 | r = 0; |
| 1718 | c = argv[i][j]; |
| 1719 | switch (c) { |
| 1720 | case ' ': |
| 1721 | case '\t': |
| 1722 | ws = 1; |
| 1723 | r = sshbuf_put_u8(arg, c); |
| 1724 | break; |
| 1725 | case '\\': |
| 1726 | case '\'': |
| 1727 | case '"': |
| 1728 | if ((r = sshbuf_put_u8(arg, '\\')) != 0) |
| 1729 | break; |
| 1730 | /* FALLTHROUGH */ |
| 1731 | default: |
| 1732 | r = sshbuf_put_u8(arg, c); |
| 1733 | break; |
| 1734 | } |
| 1735 | if (r != 0) |
| 1736 | fatal("%s: sshbuf_put_u8: %s", |
| 1737 | __func__, ssh_err(r)); |
| 1738 | } |
| 1739 | if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) || |
| 1740 | (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) || |
| 1741 | (r = sshbuf_putb(buf, arg)) != 0 || |
| 1742 | (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0)) |
| 1743 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 1744 | } |
| 1745 | if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL) |
| 1746 | fatal("%s: malloc failed", __func__); |
| 1747 | memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf)); |
| 1748 | ret[sshbuf_len(buf)] = '\0'; |
| 1749 | sshbuf_free(buf); |
| 1750 | sshbuf_free(arg); |
| 1751 | return ret; |
| 1752 | } |
| 1753 | |
djm@openbsd.org | de4ae07 | 2017-08-18 05:36:45 +0000 | [diff] [blame] | 1754 | /* Returns 0 if pid exited cleanly, non-zero otherwise */ |
| 1755 | int |
djm@openbsd.org | b074c3c | 2017-08-18 05:48:04 +0000 | [diff] [blame] | 1756 | exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet) |
djm@openbsd.org | de4ae07 | 2017-08-18 05:36:45 +0000 | [diff] [blame] | 1757 | { |
| 1758 | int status; |
| 1759 | |
| 1760 | while (waitpid(pid, &status, 0) == -1) { |
| 1761 | if (errno != EINTR) { |
| 1762 | error("%s: waitpid: %s", tag, strerror(errno)); |
| 1763 | return -1; |
| 1764 | } |
| 1765 | } |
| 1766 | if (WIFSIGNALED(status)) { |
| 1767 | error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status)); |
| 1768 | return -1; |
| 1769 | } else if (WEXITSTATUS(status) != 0) { |
djm@openbsd.org | b074c3c | 2017-08-18 05:48:04 +0000 | [diff] [blame] | 1770 | do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO, |
| 1771 | "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status)); |
djm@openbsd.org | de4ae07 | 2017-08-18 05:36:45 +0000 | [diff] [blame] | 1772 | return -1; |
| 1773 | } |
| 1774 | return 0; |
| 1775 | } |
| 1776 | |
| 1777 | /* |
| 1778 | * Check a given path for security. This is defined as all components |
| 1779 | * of the path to the file must be owned by either the owner of |
| 1780 | * of the file or root and no directories must be group or world writable. |
| 1781 | * |
| 1782 | * XXX Should any specific check be done for sym links ? |
| 1783 | * |
| 1784 | * Takes a file name, its stat information (preferably from fstat() to |
| 1785 | * avoid races), the uid of the expected owner, their home directory and an |
| 1786 | * error buffer plus max size as arguments. |
| 1787 | * |
| 1788 | * Returns 0 on success and -1 on failure |
| 1789 | */ |
| 1790 | int |
| 1791 | safe_path(const char *name, struct stat *stp, const char *pw_dir, |
| 1792 | uid_t uid, char *err, size_t errlen) |
| 1793 | { |
| 1794 | char buf[PATH_MAX], homedir[PATH_MAX]; |
| 1795 | char *cp; |
| 1796 | int comparehome = 0; |
| 1797 | struct stat st; |
| 1798 | |
| 1799 | if (realpath(name, buf) == NULL) { |
| 1800 | snprintf(err, errlen, "realpath %s failed: %s", name, |
| 1801 | strerror(errno)); |
| 1802 | return -1; |
| 1803 | } |
| 1804 | if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) |
| 1805 | comparehome = 1; |
| 1806 | |
| 1807 | if (!S_ISREG(stp->st_mode)) { |
| 1808 | snprintf(err, errlen, "%s is not a regular file", buf); |
| 1809 | return -1; |
| 1810 | } |
| 1811 | if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) || |
| 1812 | (stp->st_mode & 022) != 0) { |
| 1813 | snprintf(err, errlen, "bad ownership or modes for file %s", |
| 1814 | buf); |
| 1815 | return -1; |
| 1816 | } |
| 1817 | |
| 1818 | /* for each component of the canonical path, walking upwards */ |
| 1819 | for (;;) { |
| 1820 | if ((cp = dirname(buf)) == NULL) { |
| 1821 | snprintf(err, errlen, "dirname() failed"); |
| 1822 | return -1; |
| 1823 | } |
| 1824 | strlcpy(buf, cp, sizeof(buf)); |
| 1825 | |
| 1826 | if (stat(buf, &st) < 0 || |
| 1827 | (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) || |
| 1828 | (st.st_mode & 022) != 0) { |
| 1829 | snprintf(err, errlen, |
| 1830 | "bad ownership or modes for directory %s", buf); |
| 1831 | return -1; |
| 1832 | } |
| 1833 | |
| 1834 | /* If are past the homedir then we can stop */ |
| 1835 | if (comparehome && strcmp(homedir, buf) == 0) |
| 1836 | break; |
| 1837 | |
| 1838 | /* |
| 1839 | * dirname should always complete with a "/" path, |
| 1840 | * but we can be paranoid and check for "." too |
| 1841 | */ |
| 1842 | if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) |
| 1843 | break; |
| 1844 | } |
| 1845 | return 0; |
| 1846 | } |
| 1847 | |
| 1848 | /* |
| 1849 | * Version of safe_path() that accepts an open file descriptor to |
| 1850 | * avoid races. |
| 1851 | * |
| 1852 | * Returns 0 on success and -1 on failure |
| 1853 | */ |
| 1854 | int |
| 1855 | safe_path_fd(int fd, const char *file, struct passwd *pw, |
| 1856 | char *err, size_t errlen) |
| 1857 | { |
| 1858 | struct stat st; |
| 1859 | |
| 1860 | /* check the open file to avoid races */ |
| 1861 | if (fstat(fd, &st) < 0) { |
| 1862 | snprintf(err, errlen, "cannot stat file %s: %s", |
| 1863 | file, strerror(errno)); |
| 1864 | return -1; |
| 1865 | } |
| 1866 | return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); |
| 1867 | } |
| 1868 | |
| 1869 | /* |
| 1870 | * Sets the value of the given variable in the environment. If the variable |
| 1871 | * already exists, its value is overridden. |
| 1872 | */ |
| 1873 | void |
| 1874 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
| 1875 | const char *value) |
| 1876 | { |
| 1877 | char **env; |
| 1878 | u_int envsize; |
| 1879 | u_int i, namelen; |
| 1880 | |
| 1881 | if (strchr(name, '=') != NULL) { |
| 1882 | error("Invalid environment variable \"%.100s\"", name); |
| 1883 | return; |
| 1884 | } |
| 1885 | |
| 1886 | /* |
| 1887 | * If we're passed an uninitialized list, allocate a single null |
| 1888 | * entry before continuing. |
| 1889 | */ |
| 1890 | if (*envp == NULL && *envsizep == 0) { |
| 1891 | *envp = xmalloc(sizeof(char *)); |
| 1892 | *envp[0] = NULL; |
| 1893 | *envsizep = 1; |
| 1894 | } |
| 1895 | |
| 1896 | /* |
| 1897 | * Find the slot where the value should be stored. If the variable |
| 1898 | * already exists, we reuse the slot; otherwise we append a new slot |
| 1899 | * at the end of the array, expanding if necessary. |
| 1900 | */ |
| 1901 | env = *envp; |
| 1902 | namelen = strlen(name); |
| 1903 | for (i = 0; env[i]; i++) |
| 1904 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') |
| 1905 | break; |
| 1906 | if (env[i]) { |
| 1907 | /* Reuse the slot. */ |
| 1908 | free(env[i]); |
| 1909 | } else { |
| 1910 | /* New variable. Expand if necessary. */ |
| 1911 | envsize = *envsizep; |
| 1912 | if (i >= envsize - 1) { |
| 1913 | if (envsize >= 1000) |
| 1914 | fatal("child_set_env: too many env vars"); |
| 1915 | envsize += 50; |
| 1916 | env = (*envp) = xreallocarray(env, envsize, sizeof(char *)); |
| 1917 | *envsizep = envsize; |
| 1918 | } |
| 1919 | /* Need to set the NULL pointer at end of array beyond the new slot. */ |
| 1920 | env[i + 1] = NULL; |
| 1921 | } |
| 1922 | |
| 1923 | /* Allocate space and format the variable in the appropriate slot. */ |
djm@openbsd.org | 7c85685 | 2018-03-03 03:15:51 +0000 | [diff] [blame] | 1924 | /* XXX xasprintf */ |
djm@openbsd.org | de4ae07 | 2017-08-18 05:36:45 +0000 | [diff] [blame] | 1925 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); |
| 1926 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); |
| 1927 | } |
| 1928 | |
millert@openbsd.org | 887669e | 2017-10-21 23:06:24 +0000 | [diff] [blame] | 1929 | /* |
| 1930 | * Check and optionally lowercase a domain name, also removes trailing '.' |
| 1931 | * Returns 1 on success and 0 on failure, storing an error message in errstr. |
| 1932 | */ |
| 1933 | int |
| 1934 | valid_domain(char *name, int makelower, const char **errstr) |
| 1935 | { |
| 1936 | size_t i, l = strlen(name); |
| 1937 | u_char c, last = '\0'; |
| 1938 | static char errbuf[256]; |
| 1939 | |
| 1940 | if (l == 0) { |
| 1941 | strlcpy(errbuf, "empty domain name", sizeof(errbuf)); |
| 1942 | goto bad; |
| 1943 | } |
| 1944 | if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) { |
| 1945 | snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" " |
| 1946 | "starts with invalid character", name); |
| 1947 | goto bad; |
| 1948 | } |
| 1949 | for (i = 0; i < l; i++) { |
| 1950 | c = tolower((u_char)name[i]); |
| 1951 | if (makelower) |
| 1952 | name[i] = (char)c; |
| 1953 | if (last == '.' && c == '.') { |
| 1954 | snprintf(errbuf, sizeof(errbuf), "domain name " |
| 1955 | "\"%.100s\" contains consecutive separators", name); |
| 1956 | goto bad; |
| 1957 | } |
| 1958 | if (c != '.' && c != '-' && !isalnum(c) && |
| 1959 | c != '_') /* technically invalid, but common */ { |
| 1960 | snprintf(errbuf, sizeof(errbuf), "domain name " |
| 1961 | "\"%.100s\" contains invalid characters", name); |
| 1962 | goto bad; |
| 1963 | } |
| 1964 | last = c; |
| 1965 | } |
| 1966 | if (name[l - 1] == '.') |
| 1967 | name[l - 1] = '\0'; |
| 1968 | if (errstr != NULL) |
| 1969 | *errstr = NULL; |
| 1970 | return 1; |
| 1971 | bad: |
| 1972 | if (errstr != NULL) |
| 1973 | *errstr = errbuf; |
| 1974 | return 0; |
| 1975 | } |
dtucker@openbsd.org | 609d96b | 2017-12-05 23:59:47 +0000 | [diff] [blame] | 1976 | |
| 1977 | const char * |
| 1978 | atoi_err(const char *nptr, int *val) |
| 1979 | { |
| 1980 | const char *errstr = NULL; |
| 1981 | long long num; |
| 1982 | |
| 1983 | if (nptr == NULL || *nptr == '\0') |
| 1984 | return "missing"; |
| 1985 | num = strtonum(nptr, 0, INT_MAX, &errstr); |
| 1986 | if (errstr == NULL) |
| 1987 | *val = (int)num; |
| 1988 | return errstr; |
| 1989 | } |