dtucker@openbsd.org | 1c554a5 | 2019-05-03 03:27:38 +0000 | [diff] [blame] | 1 | /* $OpenBSD: sshconnect.c,v 1.315 2019/05/03 03:27:38 dtucker Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 6 | * Code to connect to a remote host, and to perform the client side of the |
| 7 | * login (authentication) dialog. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 8 | * |
| 9 | * As far as I am concerned, the code I have written for this software |
| 10 | * can be used freely for any purpose. Any derived versions of this |
| 11 | * software must be clearly marked as such, and if the derived work is |
| 12 | * incompatible with the protocol description in the RFC file, it must be |
| 13 | * called by a name other than "ssh" or "Secure Shell". |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 14 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 15 | |
| 16 | #include "includes.h" |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 17 | |
| 18 | #include <sys/types.h> |
| 19 | #include <sys/wait.h> |
Damien Miller | f17883e | 2006-03-15 11:45:54 +1100 | [diff] [blame] | 20 | #include <sys/stat.h> |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 21 | #include <sys/socket.h> |
Damien Miller | 9aec919 | 2006-08-05 10:57:45 +1000 | [diff] [blame] | 22 | #ifdef HAVE_SYS_TIME_H |
| 23 | # include <sys/time.h> |
| 24 | #endif |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 25 | |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 26 | #include <net/if.h> |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 27 | #include <netinet/in.h> |
Darren Tucker | 46aa3e0 | 2006-09-02 15:32:40 +1000 | [diff] [blame] | 28 | #include <arpa/inet.h> |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 29 | |
Damien Miller | c7b0636 | 2006-03-15 11:53:45 +1100 | [diff] [blame] | 30 | #include <ctype.h> |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 31 | #include <errno.h> |
Darren Tucker | 6e7fe1c | 2010-01-08 17:07:22 +1100 | [diff] [blame] | 32 | #include <fcntl.h> |
Damien Miller | b8fe89c | 2006-07-24 14:51:00 +1000 | [diff] [blame] | 33 | #include <netdb.h> |
Damien Miller | 6645e7a | 2006-03-15 14:42:54 +1100 | [diff] [blame] | 34 | #ifdef HAVE_PATHS_H |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 35 | #include <paths.h> |
Damien Miller | 6645e7a | 2006-03-15 14:42:54 +1100 | [diff] [blame] | 36 | #endif |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 37 | #include <pwd.h> |
djm@openbsd.org | 4540428 | 2017-06-24 05:37:44 +0000 | [diff] [blame] | 38 | #ifdef HAVE_POLL_H |
| 39 | #include <poll.h> |
| 40 | #endif |
Damien Miller | 9c0c31d | 2010-10-12 13:30:44 +1100 | [diff] [blame] | 41 | #include <signal.h> |
Damien Miller | ded319c | 2006-09-01 15:38:36 +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 | e6b3b61 | 2006-07-24 14:01:23 +1000 | [diff] [blame] | 46 | #include <unistd.h> |
Darren Tucker | b59162d | 2018-02-23 15:20:42 +1100 | [diff] [blame] | 47 | #ifdef HAVE_IFADDRS_H |
| 48 | # include <ifaddrs.h> |
| 49 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 50 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 51 | #include "xmalloc.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 52 | #include "hostfile.h" |
| 53 | #include "ssh.h" |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 54 | #include "sshbuf.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 55 | #include "packet.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 56 | #include "compat.h" |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 57 | #include "sshkey.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 58 | #include "sshconnect.h" |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 59 | #include "hostfile.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 60 | #include "log.h" |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 61 | #include "misc.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 62 | #include "readconf.h" |
| 63 | #include "atomicio.h" |
Damien Miller | 37876e9 | 2003-05-15 10:19:46 +1000 | [diff] [blame] | 64 | #include "dns.h" |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 65 | #include "monitor_fdpass.h" |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 66 | #include "ssh2.h" |
Damien Miller | b757677 | 2006-07-10 20:23:39 +1000 | [diff] [blame] | 67 | #include "version.h" |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 68 | #include "authfile.h" |
| 69 | #include "ssherr.h" |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 70 | #include "authfd.h" |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 71 | #include "kex.h" |
Damien Miller | 37876e9 | 2003-05-15 10:19:46 +1000 | [diff] [blame] | 72 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 73 | struct sshkey *previous_host_key = NULL; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 74 | |
Damien Miller | c1af1d5 | 2005-11-05 15:08:57 +1100 | [diff] [blame] | 75 | static int matching_host_key_dns = 0; |
Damien Miller | 7392ae6 | 2003-06-11 22:05:25 +1000 | [diff] [blame] | 76 | |
Damien Miller | a41ccca | 2010-10-07 22:07:32 +1100 | [diff] [blame] | 77 | static pid_t proxy_command_pid = 0; |
| 78 | |
Ben Lindstrom | f9c4884 | 2002-06-11 16:37:51 +0000 | [diff] [blame] | 79 | /* import */ |
djm@openbsd.org | ccef7c4 | 2018-11-16 06:17:38 +0000 | [diff] [blame] | 80 | extern int debug_flag; |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 81 | extern Options options; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 82 | extern char *__progname; |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 83 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 84 | static int show_other_keys(struct hostkeys *, struct sshkey *); |
| 85 | static void warn_changed_key(struct sshkey *); |
Ben Lindstrom | 3ed6640 | 2002-08-01 01:21:56 +0000 | [diff] [blame] | 86 | |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 87 | /* Expand a proxy command */ |
| 88 | static char * |
| 89 | expand_proxy_command(const char *proxy_command, const char *user, |
| 90 | const char *host, int port) |
| 91 | { |
| 92 | char *tmp, *ret, strport[NI_MAXSERV]; |
| 93 | |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 94 | snprintf(strport, sizeof strport, "%d", port); |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 95 | xasprintf(&tmp, "exec %s", proxy_command); |
| 96 | ret = percent_expand(tmp, "h", host, "p", strport, |
| 97 | "r", options.user, (char *)NULL); |
| 98 | free(tmp); |
| 99 | return ret; |
| 100 | } |
| 101 | |
djm@openbsd.org | ccef7c4 | 2018-11-16 06:17:38 +0000 | [diff] [blame] | 102 | static void |
| 103 | stderr_null(void) |
| 104 | { |
| 105 | int devnull; |
| 106 | |
| 107 | if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1) { |
| 108 | error("Can't open %s for stderr redirection: %s", |
| 109 | _PATH_DEVNULL, strerror(errno)); |
| 110 | return; |
| 111 | } |
| 112 | if (devnull == STDERR_FILENO) |
| 113 | return; |
| 114 | if (dup2(devnull, STDERR_FILENO) == -1) |
| 115 | error("Cannot redirect stderr to %s", _PATH_DEVNULL); |
| 116 | if (devnull > STDERR_FILENO) |
| 117 | close(devnull); |
| 118 | } |
| 119 | |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 120 | /* |
| 121 | * Connect to the given ssh server using a proxy command that passes a |
| 122 | * a connected fd back to us. |
| 123 | */ |
| 124 | static int |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 125 | ssh_proxy_fdpass_connect(struct ssh *ssh, const char *host, u_short port, |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 126 | const char *proxy_command) |
| 127 | { |
| 128 | char *command_string; |
| 129 | int sp[2], sock; |
| 130 | pid_t pid; |
| 131 | char *shell; |
| 132 | |
| 133 | if ((shell = getenv("SHELL")) == NULL) |
| 134 | shell = _PATH_BSHELL; |
| 135 | |
| 136 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) < 0) |
| 137 | fatal("Could not create socketpair to communicate with " |
| 138 | "proxy dialer: %.100s", strerror(errno)); |
| 139 | |
| 140 | command_string = expand_proxy_command(proxy_command, options.user, |
| 141 | host, port); |
| 142 | debug("Executing proxy dialer command: %.500s", command_string); |
| 143 | |
| 144 | /* Fork and execute the proxy command. */ |
| 145 | if ((pid = fork()) == 0) { |
| 146 | char *argv[10]; |
| 147 | |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 148 | close(sp[1]); |
| 149 | /* Redirect stdin and stdout. */ |
| 150 | if (sp[0] != 0) { |
| 151 | if (dup2(sp[0], 0) < 0) |
| 152 | perror("dup2 stdin"); |
| 153 | } |
| 154 | if (sp[0] != 1) { |
| 155 | if (dup2(sp[0], 1) < 0) |
| 156 | perror("dup2 stdout"); |
| 157 | } |
| 158 | if (sp[0] >= 2) |
| 159 | close(sp[0]); |
| 160 | |
| 161 | /* |
djm@openbsd.org | ccef7c4 | 2018-11-16 06:17:38 +0000 | [diff] [blame] | 162 | * Stderr is left for non-ControlPersist connections is so |
| 163 | * error messages may be printed on the user's terminal. |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 164 | */ |
dtucker@openbsd.org | 7fca94e | 2018-11-18 22:43:29 +0000 | [diff] [blame] | 165 | if (!debug_flag && options.control_path != NULL && |
| 166 | options.control_persist) |
djm@openbsd.org | ccef7c4 | 2018-11-16 06:17:38 +0000 | [diff] [blame] | 167 | stderr_null(); |
| 168 | |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 169 | argv[0] = shell; |
| 170 | argv[1] = "-c"; |
| 171 | argv[2] = command_string; |
| 172 | argv[3] = NULL; |
| 173 | |
| 174 | /* |
| 175 | * Execute the proxy command. |
| 176 | * Note that we gave up any extra privileges above. |
| 177 | */ |
| 178 | execv(argv[0], argv); |
| 179 | perror(argv[0]); |
| 180 | exit(1); |
| 181 | } |
| 182 | /* Parent. */ |
| 183 | if (pid < 0) |
| 184 | fatal("fork failed: %.100s", strerror(errno)); |
| 185 | close(sp[0]); |
| 186 | free(command_string); |
| 187 | |
| 188 | if ((sock = mm_receive_fd(sp[1])) == -1) |
| 189 | fatal("proxy dialer did not pass back a connection"); |
markus@openbsd.org | fc77ccd | 2016-01-14 22:56:56 +0000 | [diff] [blame] | 190 | close(sp[1]); |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 191 | |
| 192 | while (waitpid(pid, NULL, 0) == -1) |
| 193 | if (errno != EINTR) |
| 194 | fatal("Couldn't wait for child: %s", strerror(errno)); |
| 195 | |
| 196 | /* Set the connection file descriptors. */ |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 197 | if (ssh_packet_set_connection(ssh, sock, sock) == NULL) |
| 198 | return -1; /* ssh_packet_set_connection logs error */ |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 199 | |
| 200 | return 0; |
| 201 | } |
| 202 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 203 | /* |
| 204 | * Connect to the given ssh server using a proxy command. |
| 205 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 206 | static int |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 207 | ssh_proxy_connect(struct ssh *ssh, const char *host, u_short port, |
| 208 | const char *proxy_command) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 209 | { |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 210 | char *command_string; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 211 | int pin[2], pout[2]; |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 212 | pid_t pid; |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 213 | char *shell; |
Damien Miller | 1d824ab | 2007-09-17 11:58:04 +1000 | [diff] [blame] | 214 | |
Damien Miller | 38d9a96 | 2010-10-07 22:07:11 +1100 | [diff] [blame] | 215 | if ((shell = getenv("SHELL")) == NULL || *shell == '\0') |
Damien Miller | 1d824ab | 2007-09-17 11:58:04 +1000 | [diff] [blame] | 216 | shell = _PATH_BSHELL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 217 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 218 | /* Create pipes for communicating with the proxy. */ |
| 219 | if (pipe(pin) < 0 || pipe(pout) < 0) |
| 220 | fatal("Could not create pipes to communicate with the proxy: %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 221 | strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 222 | |
Damien Miller | 1262b66 | 2013-08-21 02:44:24 +1000 | [diff] [blame] | 223 | command_string = expand_proxy_command(proxy_command, options.user, |
| 224 | host, port); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 225 | debug("Executing proxy command: %.500s", command_string); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 226 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 227 | /* Fork and execute the proxy command. */ |
| 228 | if ((pid = fork()) == 0) { |
| 229 | char *argv[10]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 230 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 231 | /* Redirect stdin and stdout. */ |
| 232 | close(pin[1]); |
| 233 | if (pin[0] != 0) { |
| 234 | if (dup2(pin[0], 0) < 0) |
| 235 | perror("dup2 stdin"); |
| 236 | close(pin[0]); |
| 237 | } |
| 238 | close(pout[0]); |
| 239 | if (dup2(pout[1], 1) < 0) |
| 240 | perror("dup2 stdout"); |
| 241 | /* Cannot be 1 because pin allocated two descriptors. */ |
| 242 | close(pout[1]); |
| 243 | |
djm@openbsd.org | ccef7c4 | 2018-11-16 06:17:38 +0000 | [diff] [blame] | 244 | /* |
| 245 | * Stderr is left for non-ControlPersist connections is so |
| 246 | * error messages may be printed on the user's terminal. |
| 247 | */ |
dtucker@openbsd.org | 7fca94e | 2018-11-18 22:43:29 +0000 | [diff] [blame] | 248 | if (!debug_flag && options.control_path != NULL && |
| 249 | options.control_persist) |
djm@openbsd.org | ccef7c4 | 2018-11-16 06:17:38 +0000 | [diff] [blame] | 250 | stderr_null(); |
| 251 | |
Damien Miller | 1d824ab | 2007-09-17 11:58:04 +1000 | [diff] [blame] | 252 | argv[0] = shell; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 253 | argv[1] = "-c"; |
| 254 | argv[2] = command_string; |
| 255 | argv[3] = NULL; |
| 256 | |
| 257 | /* Execute the proxy command. Note that we gave up any |
| 258 | extra privileges above. */ |
Damien Miller | 6fb6fd5 | 2011-01-16 23:17:45 +1100 | [diff] [blame] | 259 | signal(SIGPIPE, SIG_DFL); |
Kevin Steves | fcd5d60 | 2001-01-07 11:45:22 +0000 | [diff] [blame] | 260 | execv(argv[0], argv); |
| 261 | perror(argv[0]); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 262 | exit(1); |
| 263 | } |
| 264 | /* Parent. */ |
| 265 | if (pid < 0) |
| 266 | fatal("fork failed: %.100s", strerror(errno)); |
Damien Miller | 8c4e18a | 2002-09-19 12:05:02 +1000 | [diff] [blame] | 267 | else |
| 268 | proxy_command_pid = pid; /* save pid to clean up later */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 269 | |
| 270 | /* Close child side of the descriptors. */ |
| 271 | close(pin[0]); |
| 272 | close(pout[1]); |
| 273 | |
| 274 | /* Free the command name. */ |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 275 | free(command_string); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 276 | |
| 277 | /* Set the connection file descriptors. */ |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 278 | if (ssh_packet_set_connection(ssh, pout[0], pin[1]) == NULL) |
| 279 | return -1; /* ssh_packet_set_connection logs error */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 280 | |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 281 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 282 | } |
| 283 | |
Damien Miller | a41ccca | 2010-10-07 22:07:32 +1100 | [diff] [blame] | 284 | void |
| 285 | ssh_kill_proxy_command(void) |
| 286 | { |
| 287 | /* |
| 288 | * Send SIGHUP to proxy command if used. We don't wait() in |
| 289 | * case it hangs and instead rely on init to reap the child |
| 290 | */ |
| 291 | if (proxy_command_pid > 1) |
Damien Miller | 45fcdaa | 2010-10-07 22:07:58 +1100 | [diff] [blame] | 292 | kill(proxy_command_pid, SIGHUP); |
Damien Miller | a41ccca | 2010-10-07 22:07:32 +1100 | [diff] [blame] | 293 | } |
| 294 | |
Darren Tucker | b59162d | 2018-02-23 15:20:42 +1100 | [diff] [blame] | 295 | #ifdef HAVE_IFADDRS_H |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 296 | /* |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 297 | * Search a interface address list (returned from getifaddrs(3)) for an |
djm@openbsd.org | 001aa55 | 2018-04-10 00:10:49 +0000 | [diff] [blame] | 298 | * address that matches the desired address family on the specified interface. |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 299 | * Returns 0 and fills in *resultp and *rlenp on success. Returns -1 on failure. |
| 300 | */ |
| 301 | static int |
| 302 | check_ifaddrs(const char *ifname, int af, const struct ifaddrs *ifaddrs, |
| 303 | struct sockaddr_storage *resultp, socklen_t *rlenp) |
| 304 | { |
| 305 | struct sockaddr_in6 *sa6; |
| 306 | struct sockaddr_in *sa; |
| 307 | struct in6_addr *v6addr; |
| 308 | const struct ifaddrs *ifa; |
| 309 | int allow_local; |
| 310 | |
| 311 | /* |
| 312 | * Prefer addresses that are not loopback or linklocal, but use them |
| 313 | * if nothing else matches. |
| 314 | */ |
| 315 | for (allow_local = 0; allow_local < 2; allow_local++) { |
| 316 | for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) { |
| 317 | if (ifa->ifa_addr == NULL || ifa->ifa_name == NULL || |
| 318 | (ifa->ifa_flags & IFF_UP) == 0 || |
| 319 | ifa->ifa_addr->sa_family != af || |
| 320 | strcmp(ifa->ifa_name, options.bind_interface) != 0) |
| 321 | continue; |
| 322 | switch (ifa->ifa_addr->sa_family) { |
| 323 | case AF_INET: |
| 324 | sa = (struct sockaddr_in *)ifa->ifa_addr; |
| 325 | if (!allow_local && sa->sin_addr.s_addr == |
| 326 | htonl(INADDR_LOOPBACK)) |
| 327 | continue; |
| 328 | if (*rlenp < sizeof(struct sockaddr_in)) { |
| 329 | error("%s: v4 addr doesn't fit", |
| 330 | __func__); |
| 331 | return -1; |
| 332 | } |
| 333 | *rlenp = sizeof(struct sockaddr_in); |
| 334 | memcpy(resultp, sa, *rlenp); |
| 335 | return 0; |
| 336 | case AF_INET6: |
| 337 | sa6 = (struct sockaddr_in6 *)ifa->ifa_addr; |
| 338 | v6addr = &sa6->sin6_addr; |
| 339 | if (!allow_local && |
| 340 | (IN6_IS_ADDR_LINKLOCAL(v6addr) || |
| 341 | IN6_IS_ADDR_LOOPBACK(v6addr))) |
| 342 | continue; |
| 343 | if (*rlenp < sizeof(struct sockaddr_in6)) { |
| 344 | error("%s: v6 addr doesn't fit", |
| 345 | __func__); |
| 346 | return -1; |
| 347 | } |
| 348 | *rlenp = sizeof(struct sockaddr_in6); |
| 349 | memcpy(resultp, sa6, *rlenp); |
| 350 | return 0; |
| 351 | } |
| 352 | } |
| 353 | } |
| 354 | return -1; |
| 355 | } |
Darren Tucker | b59162d | 2018-02-23 15:20:42 +1100 | [diff] [blame] | 356 | #endif |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 357 | |
| 358 | /* |
dtucker@openbsd.org | 3ba6e68 | 2018-07-19 23:03:16 +0000 | [diff] [blame] | 359 | * Creates a socket for use as the ssh connection. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 360 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 361 | static int |
dtucker@openbsd.org | 95d41e9 | 2018-07-19 10:28:47 +0000 | [diff] [blame] | 362 | ssh_create_socket(struct addrinfo *ai) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 363 | { |
dtucker@openbsd.org | 258dc8b | 2018-07-18 11:34:04 +0000 | [diff] [blame] | 364 | int sock, r; |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 365 | struct sockaddr_storage bindaddr; |
| 366 | socklen_t bindaddrlen = 0; |
Damien Miller | d1a7a9c | 2014-02-07 09:24:33 +1100 | [diff] [blame] | 367 | struct addrinfo hints, *res = NULL; |
Darren Tucker | b59162d | 2018-02-23 15:20:42 +1100 | [diff] [blame] | 368 | #ifdef HAVE_IFADDRS_H |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 369 | struct ifaddrs *ifaddrs = NULL; |
Darren Tucker | b59162d | 2018-02-23 15:20:42 +1100 | [diff] [blame] | 370 | #endif |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 371 | char ntop[NI_MAXHOST]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 372 | |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 373 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
Darren Tucker | 6e7fe1c | 2010-01-08 17:07:22 +1100 | [diff] [blame] | 374 | if (sock < 0) { |
Darren Tucker | e6e52f8 | 2013-10-10 10:28:07 +1100 | [diff] [blame] | 375 | error("socket: %s", strerror(errno)); |
Darren Tucker | 6e7fe1c | 2010-01-08 17:07:22 +1100 | [diff] [blame] | 376 | return -1; |
| 377 | } |
| 378 | fcntl(sock, F_SETFD, FD_CLOEXEC); |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 379 | |
| 380 | /* Bind the socket to an alternative local IP address */ |
dtucker@openbsd.org | 95d41e9 | 2018-07-19 10:28:47 +0000 | [diff] [blame] | 381 | if (options.bind_address == NULL && options.bind_interface == NULL) |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 382 | return sock; |
| 383 | |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 384 | if (options.bind_address != NULL) { |
Damien Miller | d1a7a9c | 2014-02-07 09:24:33 +1100 | [diff] [blame] | 385 | memset(&hints, 0, sizeof(hints)); |
| 386 | hints.ai_family = ai->ai_family; |
| 387 | hints.ai_socktype = ai->ai_socktype; |
| 388 | hints.ai_protocol = ai->ai_protocol; |
| 389 | hints.ai_flags = AI_PASSIVE; |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 390 | if ((r = getaddrinfo(options.bind_address, NULL, |
| 391 | &hints, &res)) != 0) { |
Damien Miller | d1a7a9c | 2014-02-07 09:24:33 +1100 | [diff] [blame] | 392 | error("getaddrinfo: %s: %s", options.bind_address, |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 393 | ssh_gai_strerror(r)); |
| 394 | goto fail; |
Damien Miller | d1a7a9c | 2014-02-07 09:24:33 +1100 | [diff] [blame] | 395 | } |
dtucker@openbsd.org | 3e19fb9 | 2018-02-23 04:18:46 +0000 | [diff] [blame] | 396 | if (res == NULL) { |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 397 | error("getaddrinfo: no addrs"); |
| 398 | goto fail; |
dtucker@openbsd.org | 3e19fb9 | 2018-02-23 04:18:46 +0000 | [diff] [blame] | 399 | } |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 400 | memcpy(&bindaddr, res->ai_addr, res->ai_addrlen); |
| 401 | bindaddrlen = res->ai_addrlen; |
| 402 | } else if (options.bind_interface != NULL) { |
Darren Tucker | b59162d | 2018-02-23 15:20:42 +1100 | [diff] [blame] | 403 | #ifdef HAVE_IFADDRS_H |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 404 | if ((r = getifaddrs(&ifaddrs)) != 0) { |
| 405 | error("getifaddrs: %s: %s", options.bind_interface, |
| 406 | strerror(errno)); |
| 407 | goto fail; |
| 408 | } |
| 409 | bindaddrlen = sizeof(bindaddr); |
| 410 | if (check_ifaddrs(options.bind_interface, ai->ai_family, |
| 411 | ifaddrs, &bindaddr, &bindaddrlen) != 0) { |
| 412 | logit("getifaddrs: %s: no suitable addresses", |
| 413 | options.bind_interface); |
| 414 | goto fail; |
| 415 | } |
Darren Tucker | b59162d | 2018-02-23 15:20:42 +1100 | [diff] [blame] | 416 | #else |
| 417 | error("BindInterface not supported on this platform."); |
| 418 | #endif |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 419 | } |
| 420 | if ((r = getnameinfo((struct sockaddr *)&bindaddr, bindaddrlen, |
| 421 | ntop, sizeof(ntop), NULL, 0, NI_NUMERICHOST)) != 0) { |
| 422 | error("%s: getnameinfo failed: %s", __func__, |
| 423 | ssh_gai_strerror(r)); |
| 424 | goto fail; |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 425 | } |
dtucker@openbsd.org | 258dc8b | 2018-07-18 11:34:04 +0000 | [diff] [blame] | 426 | if (bind(sock, (struct sockaddr *)&bindaddr, bindaddrlen) != 0) { |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 427 | error("bind %s: %s", ntop, strerror(errno)); |
| 428 | goto fail; |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 429 | } |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 430 | debug("%s: bound to %s", __func__, ntop); |
| 431 | /* success */ |
| 432 | goto out; |
| 433 | fail: |
| 434 | close(sock); |
| 435 | sock = -1; |
| 436 | out: |
Damien Miller | d1a7a9c | 2014-02-07 09:24:33 +1100 | [diff] [blame] | 437 | if (res != NULL) |
| 438 | freeaddrinfo(res); |
Darren Tucker | b59162d | 2018-02-23 15:20:42 +1100 | [diff] [blame] | 439 | #ifdef HAVE_IFADDRS_H |
djm@openbsd.org | ac2e302 | 2018-02-23 02:34:33 +0000 | [diff] [blame] | 440 | if (ifaddrs != NULL) |
| 441 | freeifaddrs(ifaddrs); |
Darren Tucker | b59162d | 2018-02-23 15:20:42 +1100 | [diff] [blame] | 442 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 443 | return sock; |
| 444 | } |
| 445 | |
djm@openbsd.org | 4540428 | 2017-06-24 05:37:44 +0000 | [diff] [blame] | 446 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 447 | * Opens a TCP/IP connection to the remote server on the given host. |
| 448 | * The address of the remote host will be returned in hostaddr. |
dtucker@openbsd.org | 95d41e9 | 2018-07-19 10:28:47 +0000 | [diff] [blame] | 449 | * If port is 0, the default port will be used. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 450 | * Connection_attempts specifies the maximum number of tries (one per |
| 451 | * second). If proxy_command is non-NULL, it specifies the command (with %h |
| 452 | * and %p substituted for host and port, respectively) to use to contact |
| 453 | * the daemon. |
| 454 | */ |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 455 | static int |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 456 | ssh_connect_direct(struct ssh *ssh, const char *host, struct addrinfo *aitop, |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 457 | struct sockaddr_storage *hostaddr, u_short port, int family, |
dtucker@openbsd.org | 95d41e9 | 2018-07-19 10:28:47 +0000 | [diff] [blame] | 458 | int connection_attempts, int *timeout_ms, int want_keepalive) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 459 | { |
dtucker@openbsd.org | 483b3b6 | 2019-02-01 03:52:23 +0000 | [diff] [blame] | 460 | int on = 1, saved_timeout_ms = *timeout_ms; |
djm@openbsd.org | 7c77991 | 2018-01-23 05:17:04 +0000 | [diff] [blame] | 461 | int oerrno, sock = -1, attempt; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 462 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 463 | struct addrinfo *ai; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 464 | |
dtucker@openbsd.org | 95d41e9 | 2018-07-19 10:28:47 +0000 | [diff] [blame] | 465 | debug2("%s", __func__); |
djm@openbsd.org | 88b6fcd | 2015-11-19 08:23:27 +0000 | [diff] [blame] | 466 | memset(ntop, 0, sizeof(ntop)); |
| 467 | memset(strport, 0, sizeof(strport)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 468 | |
Damien Miller | 56e5e6a | 2006-04-23 12:08:59 +1000 | [diff] [blame] | 469 | for (attempt = 0; attempt < connection_attempts; attempt++) { |
Damien Miller | f4bcd10 | 2006-10-24 03:02:23 +1000 | [diff] [blame] | 470 | if (attempt > 0) { |
| 471 | /* Sleep a moment before retrying. */ |
| 472 | sleep(1); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 473 | debug("Trying again..."); |
Damien Miller | f4bcd10 | 2006-10-24 03:02:23 +1000 | [diff] [blame] | 474 | } |
Damien Miller | 56e5e6a | 2006-04-23 12:08:59 +1000 | [diff] [blame] | 475 | /* |
| 476 | * Loop through addresses for this host, and try each one in |
| 477 | * sequence until the connection succeeds. |
| 478 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 479 | for (ai = aitop; ai; ai = ai->ai_next) { |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 480 | if (ai->ai_family != AF_INET && |
djm@openbsd.org | 7c77991 | 2018-01-23 05:17:04 +0000 | [diff] [blame] | 481 | ai->ai_family != AF_INET6) { |
| 482 | errno = EAFNOSUPPORT; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 483 | continue; |
djm@openbsd.org | 7c77991 | 2018-01-23 05:17:04 +0000 | [diff] [blame] | 484 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 485 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, |
| 486 | ntop, sizeof(ntop), strport, sizeof(strport), |
| 487 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
djm@openbsd.org | 7c77991 | 2018-01-23 05:17:04 +0000 | [diff] [blame] | 488 | oerrno = errno; |
djm@openbsd.org | 46152af | 2015-09-04 04:55:24 +0000 | [diff] [blame] | 489 | error("%s: getnameinfo failed", __func__); |
djm@openbsd.org | 7c77991 | 2018-01-23 05:17:04 +0000 | [diff] [blame] | 490 | errno = oerrno; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 491 | continue; |
| 492 | } |
| 493 | debug("Connecting to %.200s [%.100s] port %s.", |
| 494 | host, ntop, strport); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 495 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 496 | /* Create a socket for connecting. */ |
dtucker@openbsd.org | 95d41e9 | 2018-07-19 10:28:47 +0000 | [diff] [blame] | 497 | sock = ssh_create_socket(ai); |
stsp@openbsd.org | a60c5dc | 2018-01-23 18:33:49 +0000 | [diff] [blame] | 498 | if (sock < 0) { |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 499 | /* Any error is already output */ |
djm@openbsd.org | 7c77991 | 2018-01-23 05:17:04 +0000 | [diff] [blame] | 500 | errno = 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 501 | continue; |
stsp@openbsd.org | a60c5dc | 2018-01-23 18:33:49 +0000 | [diff] [blame] | 502 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 503 | |
dtucker@openbsd.org | 483b3b6 | 2019-02-01 03:52:23 +0000 | [diff] [blame] | 504 | *timeout_ms = saved_timeout_ms; |
Damien Miller | b78d5eb | 2003-05-16 11:39:04 +1000 | [diff] [blame] | 505 | if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen, |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 506 | timeout_ms) >= 0) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 507 | /* Successful connection. */ |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 508 | memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 509 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 510 | } else { |
djm@openbsd.org | 7c77991 | 2018-01-23 05:17:04 +0000 | [diff] [blame] | 511 | oerrno = errno; |
Ben Lindstrom | 728aa7e | 2002-07-15 17:48:11 +0000 | [diff] [blame] | 512 | debug("connect to address %s port %s: %s", |
| 513 | ntop, strport, strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 514 | close(sock); |
Damien Miller | 56e5e6a | 2006-04-23 12:08:59 +1000 | [diff] [blame] | 515 | sock = -1; |
djm@openbsd.org | 7c77991 | 2018-01-23 05:17:04 +0000 | [diff] [blame] | 516 | errno = oerrno; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 517 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 518 | } |
Damien Miller | 56e5e6a | 2006-04-23 12:08:59 +1000 | [diff] [blame] | 519 | if (sock != -1) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 520 | break; /* Successful connection. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 521 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 522 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 523 | /* Return failure if we didn't get a successful connection. */ |
Damien Miller | 56e5e6a | 2006-04-23 12:08:59 +1000 | [diff] [blame] | 524 | if (sock == -1) { |
Darren Tucker | b2161e3 | 2005-01-20 11:00:46 +1100 | [diff] [blame] | 525 | error("ssh: connect to host %s port %s: %s", |
djm@openbsd.org | 7c77991 | 2018-01-23 05:17:04 +0000 | [diff] [blame] | 526 | host, strport, errno == 0 ? "failure" : strerror(errno)); |
| 527 | return -1; |
Ben Lindstrom | a6cd75c | 2002-07-11 04:00:19 +0000 | [diff] [blame] | 528 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 529 | |
| 530 | debug("Connection established."); |
| 531 | |
Damien Miller | 12c150e | 2003-12-17 16:31:10 +1100 | [diff] [blame] | 532 | /* Set SO_KEEPALIVE if requested. */ |
Damien Miller | 67bd062 | 2007-09-17 12:06:57 +1000 | [diff] [blame] | 533 | if (want_keepalive && |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 534 | setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, |
| 535 | sizeof(on)) < 0) |
| 536 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 537 | |
| 538 | /* Set the connection. */ |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 539 | if (ssh_packet_set_connection(ssh, sock, sock) == NULL) |
| 540 | return -1; /* ssh_packet_set_connection logs error */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 541 | |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 542 | return 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 543 | } |
| 544 | |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 545 | int |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 546 | ssh_connect(struct ssh *ssh, const char *host, struct addrinfo *addrs, |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 547 | struct sockaddr_storage *hostaddr, u_short port, int family, |
dtucker@openbsd.org | 95d41e9 | 2018-07-19 10:28:47 +0000 | [diff] [blame] | 548 | int connection_attempts, int *timeout_ms, int want_keepalive) |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 549 | { |
markus@openbsd.org | 8e7bac3 | 2019-02-27 19:37:01 +0000 | [diff] [blame] | 550 | int in, out; |
| 551 | |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 552 | if (options.proxy_command == NULL) { |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 553 | return ssh_connect_direct(ssh, host, addrs, hostaddr, port, |
dtucker@openbsd.org | 95d41e9 | 2018-07-19 10:28:47 +0000 | [diff] [blame] | 554 | family, connection_attempts, timeout_ms, want_keepalive); |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 555 | } else if (strcmp(options.proxy_command, "-") == 0) { |
markus@openbsd.org | 8e7bac3 | 2019-02-27 19:37:01 +0000 | [diff] [blame] | 556 | if ((in = dup(STDIN_FILENO)) < 0 || |
| 557 | (out = dup(STDOUT_FILENO)) < 0) { |
| 558 | if (in >= 0) |
| 559 | close(in); |
| 560 | error("%s: dup() in/out failed", __func__); |
| 561 | return -1; /* ssh_packet_set_connection logs error */ |
| 562 | } |
| 563 | if ((ssh_packet_set_connection(ssh, in, out)) == NULL) |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 564 | return -1; /* ssh_packet_set_connection logs error */ |
| 565 | return 0; |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 566 | } else if (options.proxy_use_fdpass) { |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 567 | return ssh_proxy_fdpass_connect(ssh, host, port, |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 568 | options.proxy_command); |
| 569 | } |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 570 | return ssh_proxy_connect(ssh, host, port, options.proxy_command); |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 571 | } |
| 572 | |
Ben Lindstrom | b6c06d9 | 2001-02-10 23:21:09 +0000 | [diff] [blame] | 573 | /* defaults to 'no' */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 574 | static int |
dtucker@openbsd.org | 05b9a46 | 2019-01-24 17:00:29 +0000 | [diff] [blame] | 575 | confirm(const char *prompt, const char *fingerprint) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 576 | { |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 577 | const char *msg, *again = "Please type 'yes' or 'no': "; |
dtucker@openbsd.org | 05b9a46 | 2019-01-24 17:00:29 +0000 | [diff] [blame] | 578 | const char *again_fp = "Please type 'yes', 'no' or the fingerprint: "; |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 579 | char *p; |
| 580 | int ret = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 581 | |
Ben Lindstrom | b6c06d9 | 2001-02-10 23:21:09 +0000 | [diff] [blame] | 582 | if (options.batch_mode) |
| 583 | return 0; |
dtucker@openbsd.org | 05b9a46 | 2019-01-24 17:00:29 +0000 | [diff] [blame] | 584 | for (msg = prompt;;msg = fingerprint ? again_fp : again) { |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 585 | p = read_passphrase(msg, RP_ECHO); |
djm@openbsd.org | e0ce54c | 2017-12-06 05:06:21 +0000 | [diff] [blame] | 586 | if (p == NULL) |
| 587 | return 0; |
| 588 | p[strcspn(p, "\n")] = '\0'; |
| 589 | if (p[0] == '\0' || strcasecmp(p, "no") == 0) |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 590 | ret = 0; |
dtucker@openbsd.org | 05b9a46 | 2019-01-24 17:00:29 +0000 | [diff] [blame] | 591 | else if (strcasecmp(p, "yes") == 0 || (fingerprint != NULL && |
| 592 | strcasecmp(p, fingerprint) == 0)) |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 593 | ret = 1; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 594 | free(p); |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 595 | if (ret != -1) |
| 596 | return ret; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 597 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 598 | } |
| 599 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 600 | static int |
djm@openbsd.org | ecac7e1 | 2018-09-20 03:30:44 +0000 | [diff] [blame] | 601 | check_host_cert(const char *host, const struct sshkey *key) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 602 | { |
| 603 | const char *reason; |
djm@openbsd.org | ecac7e1 | 2018-09-20 03:30:44 +0000 | [diff] [blame] | 604 | int r; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 605 | |
djm@openbsd.org | ecac7e1 | 2018-09-20 03:30:44 +0000 | [diff] [blame] | 606 | if (sshkey_cert_check_authority(key, 1, 0, host, &reason) != 0) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 607 | error("%s", reason); |
| 608 | return 0; |
| 609 | } |
djm@openbsd.org | ecac7e1 | 2018-09-20 03:30:44 +0000 | [diff] [blame] | 610 | if (sshbuf_len(key->cert->critical) != 0) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 611 | error("Certificate for %s contains unsupported " |
| 612 | "critical options(s)", host); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 613 | return 0; |
| 614 | } |
djm@openbsd.org | ecac7e1 | 2018-09-20 03:30:44 +0000 | [diff] [blame] | 615 | if ((r = sshkey_check_cert_sigtype(key, |
| 616 | options.ca_sign_algorithms)) != 0) { |
| 617 | logit("%s: certificate signature algorithm %s: %s", __func__, |
| 618 | (key->cert == NULL || key->cert->signature_type == NULL) ? |
| 619 | "(null)" : key->cert->signature_type, ssh_err(r)); |
| 620 | return 0; |
| 621 | } |
| 622 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 623 | return 1; |
| 624 | } |
| 625 | |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 626 | static int |
| 627 | sockaddr_is_local(struct sockaddr *hostaddr) |
| 628 | { |
| 629 | switch (hostaddr->sa_family) { |
| 630 | case AF_INET: |
| 631 | return (ntohl(((struct sockaddr_in *)hostaddr)-> |
| 632 | sin_addr.s_addr) >> 24) == IN_LOOPBACKNET; |
| 633 | case AF_INET6: |
| 634 | return IN6_IS_ADDR_LOOPBACK( |
| 635 | &(((struct sockaddr_in6 *)hostaddr)->sin6_addr)); |
| 636 | default: |
| 637 | return 0; |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | /* |
| 642 | * Prepare the hostname and ip address strings that are used to lookup |
| 643 | * host keys in known_hosts files. These may have a port number appended. |
| 644 | */ |
| 645 | void |
| 646 | get_hostfile_hostname_ipaddr(char *hostname, struct sockaddr *hostaddr, |
| 647 | u_short port, char **hostfile_hostname, char **hostfile_ipaddr) |
| 648 | { |
| 649 | char ntop[NI_MAXHOST]; |
| 650 | socklen_t addrlen; |
| 651 | |
| 652 | switch (hostaddr == NULL ? -1 : hostaddr->sa_family) { |
| 653 | case -1: |
| 654 | addrlen = 0; |
| 655 | break; |
| 656 | case AF_INET: |
| 657 | addrlen = sizeof(struct sockaddr_in); |
| 658 | break; |
| 659 | case AF_INET6: |
| 660 | addrlen = sizeof(struct sockaddr_in6); |
| 661 | break; |
| 662 | default: |
| 663 | addrlen = sizeof(struct sockaddr); |
| 664 | break; |
| 665 | } |
| 666 | |
| 667 | /* |
| 668 | * We don't have the remote ip-address for connections |
| 669 | * using a proxy command |
| 670 | */ |
| 671 | if (hostfile_ipaddr != NULL) { |
| 672 | if (options.proxy_command == NULL) { |
| 673 | if (getnameinfo(hostaddr, addrlen, |
| 674 | ntop, sizeof(ntop), NULL, 0, NI_NUMERICHOST) != 0) |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 675 | fatal("%s: getnameinfo failed", __func__); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 676 | *hostfile_ipaddr = put_host_port(ntop, port); |
| 677 | } else { |
| 678 | *hostfile_ipaddr = xstrdup("<no hostip for proxy " |
| 679 | "command>"); |
| 680 | } |
| 681 | } |
| 682 | |
| 683 | /* |
| 684 | * Allow the user to record the key under a different name or |
| 685 | * differentiate a non-standard port. This is useful for ssh |
| 686 | * tunneling over forwarded connections or if you run multiple |
| 687 | * sshd's on different ports on the same machine. |
| 688 | */ |
| 689 | if (hostfile_hostname != NULL) { |
| 690 | if (options.host_key_alias != NULL) { |
| 691 | *hostfile_hostname = xstrdup(options.host_key_alias); |
| 692 | debug("using hostkeyalias: %s", *hostfile_hostname); |
| 693 | } else { |
| 694 | *hostfile_hostname = put_host_port(hostname, port); |
| 695 | } |
| 696 | } |
| 697 | } |
| 698 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 699 | /* |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 700 | * check whether the supplied host key is valid, return -1 if the key |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 701 | * is not valid. user_hostfile[0] will not be updated if 'readonly' is true. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 702 | */ |
Damien Miller | da82839 | 2006-08-05 11:35:45 +1000 | [diff] [blame] | 703 | #define RDRW 0 |
| 704 | #define RDONLY 1 |
| 705 | #define ROQUIET 2 |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 706 | static int |
Damien Miller | da82839 | 2006-08-05 11:35:45 +1000 | [diff] [blame] | 707 | check_host_key(char *hostname, struct sockaddr *hostaddr, u_short port, |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 708 | struct sshkey *host_key, int readonly, |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 709 | char **user_hostfiles, u_int num_user_hostfiles, |
| 710 | char **system_hostfiles, u_int num_system_hostfiles) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 711 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 712 | HostStatus host_status; |
| 713 | HostStatus ip_status; |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 714 | struct sshkey *raw_key = NULL; |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 715 | char *ip = NULL, *host = NULL; |
| 716 | char hostline[1000], *hostp, *fp, *ra; |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 717 | char msg[1024]; |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 718 | const char *type; |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 719 | const struct hostkey_entry *host_found, *ip_found; |
dtucker@openbsd.org | 05b9a46 | 2019-01-24 17:00:29 +0000 | [diff] [blame] | 720 | int len, cancelled_forwarding = 0, confirmed; |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 721 | int local = sockaddr_is_local(hostaddr); |
markus@openbsd.org | beb965b | 2017-05-30 14:13:40 +0000 | [diff] [blame] | 722 | int r, want_cert = sshkey_is_cert(host_key), host_ip_differ = 0; |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 723 | int hostkey_trusted = 0; /* Known or explicitly accepted by user */ |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 724 | struct hostkeys *host_hostkeys, *ip_hostkeys; |
| 725 | u_int i; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 726 | |
| 727 | /* |
| 728 | * Force accepting of the host key for loopback/localhost. The |
| 729 | * problem is that if the home directory is NFS-mounted to multiple |
| 730 | * machines, localhost will refer to a different machine in each of |
| 731 | * them, and the user will get bogus HOST_CHANGED warnings. This |
| 732 | * essentially disables host authentication for localhost; however, |
| 733 | * this is probably not a real problem. |
| 734 | */ |
Ben Lindstrom | 3cecc9a | 2001-10-03 17:39:38 +0000 | [diff] [blame] | 735 | if (options.no_host_authentication_for_localhost == 1 && local && |
| 736 | options.host_key_alias == NULL) { |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 737 | debug("Forcing accepting of host key for " |
| 738 | "loopback/localhost."); |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 739 | return 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 740 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 741 | |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 742 | /* |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 743 | * Prepare the hostname and address strings used for hostkey lookup. |
| 744 | * In some cases, these will have a port number appended. |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 745 | */ |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 746 | get_hostfile_hostname_ipaddr(hostname, hostaddr, port, &host, &ip); |
Darren Tucker | 78913e0 | 2008-06-13 04:47:34 +1000 | [diff] [blame] | 747 | |
| 748 | /* |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 749 | * Turn off check_host_ip if the connection is to localhost, via proxy |
| 750 | * command or if we don't have a hostname to compare with |
| 751 | */ |
Darren Tucker | da34553 | 2006-07-10 23:04:19 +1000 | [diff] [blame] | 752 | if (options.check_host_ip && (local || |
| 753 | strcmp(hostname, ip) == 0 || options.proxy_command != NULL)) |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 754 | options.check_host_ip = 0; |
| 755 | |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 756 | host_hostkeys = init_hostkeys(); |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 757 | for (i = 0; i < num_user_hostfiles; i++) |
| 758 | load_hostkeys(host_hostkeys, host, user_hostfiles[i]); |
| 759 | for (i = 0; i < num_system_hostfiles; i++) |
| 760 | load_hostkeys(host_hostkeys, host, system_hostfiles[i]); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 761 | |
| 762 | ip_hostkeys = NULL; |
| 763 | if (!want_cert && options.check_host_ip) { |
| 764 | ip_hostkeys = init_hostkeys(); |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 765 | for (i = 0; i < num_user_hostfiles; i++) |
| 766 | load_hostkeys(ip_hostkeys, ip, user_hostfiles[i]); |
| 767 | for (i = 0; i < num_system_hostfiles; i++) |
| 768 | load_hostkeys(ip_hostkeys, ip, system_hostfiles[i]); |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 769 | } |
| 770 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 771 | retry: |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 772 | /* Reload these as they may have changed on cert->key downgrade */ |
markus@openbsd.org | beb965b | 2017-05-30 14:13:40 +0000 | [diff] [blame] | 773 | want_cert = sshkey_is_cert(host_key); |
| 774 | type = sshkey_type(host_key); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 775 | |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 776 | /* |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 777 | * Check if the host key is present in the user's list of known |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 778 | * hosts or in the systemwide list. |
| 779 | */ |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 780 | host_status = check_key_in_hostkeys(host_hostkeys, host_key, |
| 781 | &host_found); |
| 782 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 783 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 784 | * Also perform check for the ip address, skip the check if we are |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 785 | * localhost, looking for a certificate, or the hostname was an ip |
| 786 | * address to begin with. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 787 | */ |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 788 | if (!want_cert && ip_hostkeys != NULL) { |
| 789 | ip_status = check_key_in_hostkeys(ip_hostkeys, host_key, |
| 790 | &ip_found); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 791 | if (host_status == HOST_CHANGED && |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 792 | (ip_status != HOST_CHANGED || |
| 793 | (ip_found != NULL && |
markus@openbsd.org | beb965b | 2017-05-30 14:13:40 +0000 | [diff] [blame] | 794 | !sshkey_equal(ip_found->key, host_found->key)))) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 795 | host_ip_differ = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 796 | } else |
| 797 | ip_status = host_status; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 798 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 799 | switch (host_status) { |
| 800 | case HOST_OK: |
| 801 | /* The host is known and the key matches. */ |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 802 | debug("Host '%.200s' is known and matches the %s host %s.", |
| 803 | host, type, want_cert ? "certificate" : "key"); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 804 | debug("Found %s in %s:%lu", want_cert ? "CA key" : "key", |
| 805 | host_found->file, host_found->line); |
djm@openbsd.org | 6f8ca3b | 2017-06-24 05:35:05 +0000 | [diff] [blame] | 806 | if (want_cert && |
| 807 | !check_host_cert(options.host_key_alias == NULL ? |
| 808 | hostname : options.host_key_alias, host_key)) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 809 | goto fail; |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 810 | if (options.check_host_ip && ip_status == HOST_NEW) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 811 | if (readonly || want_cert) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 812 | logit("%s host key for IP address " |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 813 | "'%.128s' not in list of known hosts.", |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 814 | type, ip); |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 815 | else if (!add_host_to_hostfile(user_hostfiles[0], ip, |
Damien Miller | e177615 | 2005-03-01 21:47:37 +1100 | [diff] [blame] | 816 | host_key, options.hash_known_hosts)) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 817 | logit("Failed to add the %s host key for IP " |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 818 | "address '%.128s' to the list of known " |
dtucker@openbsd.org | 496aeb2 | 2015-05-28 05:41:29 +0000 | [diff] [blame] | 819 | "hosts (%.500s).", type, ip, |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 820 | user_hostfiles[0]); |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 821 | else |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 822 | logit("Warning: Permanently added the %s host " |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 823 | "key for IP address '%.128s' to the list " |
| 824 | "of known hosts.", type, ip); |
Damien Miller | 1028824 | 2008-06-30 00:04:03 +1000 | [diff] [blame] | 825 | } else if (options.visual_host_key) { |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 826 | fp = sshkey_fingerprint(host_key, |
djm@openbsd.org | 56d1c83 | 2014-12-21 22:27:55 +0000 | [diff] [blame] | 827 | options.fingerprint_hash, SSH_FP_DEFAULT); |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 828 | ra = sshkey_fingerprint(host_key, |
djm@openbsd.org | 56d1c83 | 2014-12-21 22:27:55 +0000 | [diff] [blame] | 829 | options.fingerprint_hash, SSH_FP_RANDOMART); |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 830 | if (fp == NULL || ra == NULL) |
| 831 | fatal("%s: sshkey_fingerprint fail", __func__); |
djm@openbsd.org | ac3451d | 2015-09-04 03:57:38 +0000 | [diff] [blame] | 832 | logit("Host key fingerprint is %s\n%s", fp, ra); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 833 | free(ra); |
| 834 | free(fp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 835 | } |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 836 | hostkey_trusted = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 837 | break; |
| 838 | case HOST_NEW: |
Damien Miller | da82839 | 2006-08-05 11:35:45 +1000 | [diff] [blame] | 839 | if (options.host_key_alias == NULL && port != 0 && |
| 840 | port != SSH_DEFAULT_PORT) { |
| 841 | debug("checking without port identifier"); |
Damien Miller | ece92c8 | 2008-11-03 19:25:03 +1100 | [diff] [blame] | 842 | if (check_host_key(hostname, hostaddr, 0, host_key, |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 843 | ROQUIET, user_hostfiles, num_user_hostfiles, |
| 844 | system_hostfiles, num_system_hostfiles) == 0) { |
Damien Miller | da82839 | 2006-08-05 11:35:45 +1000 | [diff] [blame] | 845 | debug("found matching key w/out port"); |
| 846 | break; |
| 847 | } |
| 848 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 849 | if (readonly || want_cert) |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 850 | goto fail; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 851 | /* The host is new. */ |
djm@openbsd.org | 22376d2 | 2017-09-03 23:33:13 +0000 | [diff] [blame] | 852 | if (options.strict_host_key_checking == |
| 853 | SSH_STRICT_HOSTKEY_YES) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 854 | /* |
| 855 | * User has requested strict host key checking. We |
| 856 | * will not add the host key automatically. The only |
| 857 | * alternative left is to abort. |
| 858 | */ |
| 859 | error("No %s host key is known for %.200s and you " |
| 860 | "have requested strict checking.", type, host); |
| 861 | goto fail; |
djm@openbsd.org | 22376d2 | 2017-09-03 23:33:13 +0000 | [diff] [blame] | 862 | } else if (options.strict_host_key_checking == |
| 863 | SSH_STRICT_HOSTKEY_ASK) { |
Damien Miller | 7392ae6 | 2003-06-11 22:05:25 +1000 | [diff] [blame] | 864 | char msg1[1024], msg2[1024]; |
| 865 | |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 866 | if (show_other_keys(host_hostkeys, host_key)) |
Damien Miller | 7392ae6 | 2003-06-11 22:05:25 +1000 | [diff] [blame] | 867 | snprintf(msg1, sizeof(msg1), |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 868 | "\nbut keys of different type are already" |
| 869 | " known for this host."); |
Damien Miller | 7392ae6 | 2003-06-11 22:05:25 +1000 | [diff] [blame] | 870 | else |
| 871 | snprintf(msg1, sizeof(msg1), "."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 872 | /* The default */ |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 873 | fp = sshkey_fingerprint(host_key, |
djm@openbsd.org | 56d1c83 | 2014-12-21 22:27:55 +0000 | [diff] [blame] | 874 | options.fingerprint_hash, SSH_FP_DEFAULT); |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 875 | ra = sshkey_fingerprint(host_key, |
djm@openbsd.org | 56d1c83 | 2014-12-21 22:27:55 +0000 | [diff] [blame] | 876 | options.fingerprint_hash, SSH_FP_RANDOMART); |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 877 | if (fp == NULL || ra == NULL) |
| 878 | fatal("%s: sshkey_fingerprint fail", __func__); |
Damien Miller | 7392ae6 | 2003-06-11 22:05:25 +1000 | [diff] [blame] | 879 | msg2[0] = '\0'; |
Damien Miller | 7392ae6 | 2003-06-11 22:05:25 +1000 | [diff] [blame] | 880 | if (options.verify_host_key_dns) { |
Damien Miller | 150b557 | 2003-11-17 21:19:29 +1100 | [diff] [blame] | 881 | if (matching_host_key_dns) |
Damien Miller | 7392ae6 | 2003-06-11 22:05:25 +1000 | [diff] [blame] | 882 | snprintf(msg2, sizeof(msg2), |
| 883 | "Matching host key fingerprint" |
| 884 | " found in DNS.\n"); |
| 885 | else |
| 886 | snprintf(msg2, sizeof(msg2), |
| 887 | "No matching host key fingerprint" |
| 888 | " found in DNS.\n"); |
| 889 | } |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 890 | snprintf(msg, sizeof(msg), |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 891 | "The authenticity of host '%.200s (%s)' can't be " |
Ben Lindstrom | 3ed6640 | 2002-08-01 01:21:56 +0000 | [diff] [blame] | 892 | "established%s\n" |
Damien Miller | 1028824 | 2008-06-30 00:04:03 +1000 | [diff] [blame] | 893 | "%s key fingerprint is %s.%s%s\n%s" |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 894 | "Are you sure you want to continue connecting " |
dtucker@openbsd.org | 05b9a46 | 2019-01-24 17:00:29 +0000 | [diff] [blame] | 895 | "(yes/no/[fingerprint])? ", |
Damien Miller | 1028824 | 2008-06-30 00:04:03 +1000 | [diff] [blame] | 896 | host, ip, msg1, type, fp, |
| 897 | options.visual_host_key ? "\n" : "", |
| 898 | options.visual_host_key ? ra : "", |
| 899 | msg2); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 900 | free(ra); |
dtucker@openbsd.org | 05b9a46 | 2019-01-24 17:00:29 +0000 | [diff] [blame] | 901 | confirmed = confirm(msg, fp); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 902 | free(fp); |
dtucker@openbsd.org | 05b9a46 | 2019-01-24 17:00:29 +0000 | [diff] [blame] | 903 | if (!confirmed) |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 904 | goto fail; |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 905 | hostkey_trusted = 1; /* user explicitly confirmed */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 906 | } |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 907 | /* |
djm@openbsd.org | 22376d2 | 2017-09-03 23:33:13 +0000 | [diff] [blame] | 908 | * If in "new" or "off" strict mode, add the key automatically |
| 909 | * to the local known_hosts file. |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 910 | */ |
Damien Miller | 1227d4c | 2005-03-02 12:06:51 +1100 | [diff] [blame] | 911 | if (options.check_host_ip && ip_status == HOST_NEW) { |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 912 | snprintf(hostline, sizeof(hostline), "%s,%s", host, ip); |
Damien Miller | 1227d4c | 2005-03-02 12:06:51 +1100 | [diff] [blame] | 913 | hostp = hostline; |
| 914 | if (options.hash_known_hosts) { |
| 915 | /* Add hash of host and IP separately */ |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 916 | r = add_host_to_hostfile(user_hostfiles[0], |
| 917 | host, host_key, options.hash_known_hosts) && |
| 918 | add_host_to_hostfile(user_hostfiles[0], ip, |
Damien Miller | 1227d4c | 2005-03-02 12:06:51 +1100 | [diff] [blame] | 919 | host_key, options.hash_known_hosts); |
| 920 | } else { |
| 921 | /* Add unhashed "host,ip" */ |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 922 | r = add_host_to_hostfile(user_hostfiles[0], |
Damien Miller | 1227d4c | 2005-03-02 12:06:51 +1100 | [diff] [blame] | 923 | hostline, host_key, |
| 924 | options.hash_known_hosts); |
| 925 | } |
| 926 | } else { |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 927 | r = add_host_to_hostfile(user_hostfiles[0], host, |
| 928 | host_key, options.hash_known_hosts); |
Damien Miller | 1227d4c | 2005-03-02 12:06:51 +1100 | [diff] [blame] | 929 | hostp = host; |
| 930 | } |
| 931 | |
| 932 | if (!r) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 933 | logit("Failed to add the host to the list of known " |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 934 | "hosts (%.500s).", user_hostfiles[0]); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 935 | else |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 936 | logit("Warning: Permanently added '%.200s' (%s) to the " |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 937 | "list of known hosts.", hostp, type); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 938 | break; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 939 | case HOST_REVOKED: |
| 940 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 941 | error("@ WARNING: REVOKED HOST KEY DETECTED! @"); |
| 942 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 943 | error("The %s host key for %s is marked as revoked.", type, host); |
| 944 | error("This could mean that a stolen key is being used to"); |
| 945 | error("impersonate this host."); |
| 946 | |
| 947 | /* |
| 948 | * If strict host key checking is in use, the user will have |
| 949 | * to edit the key manually and we can only abort. |
| 950 | */ |
djm@openbsd.org | 22376d2 | 2017-09-03 23:33:13 +0000 | [diff] [blame] | 951 | if (options.strict_host_key_checking != |
| 952 | SSH_STRICT_HOSTKEY_OFF) { |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 953 | error("%s host key for %.200s was revoked and you have " |
| 954 | "requested strict checking.", type, host); |
| 955 | goto fail; |
| 956 | } |
| 957 | goto continue_unsafe; |
| 958 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 959 | case HOST_CHANGED: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 960 | if (want_cert) { |
| 961 | /* |
| 962 | * This is only a debug() since it is valid to have |
| 963 | * CAs with wildcard DNS matches that don't match |
| 964 | * all hosts that one might visit. |
| 965 | */ |
| 966 | debug("Host certificate authority does not " |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 967 | "match %s in %s:%lu", CA_MARKER, |
| 968 | host_found->file, host_found->line); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 969 | goto fail; |
| 970 | } |
Damien Miller | da82839 | 2006-08-05 11:35:45 +1000 | [diff] [blame] | 971 | if (readonly == ROQUIET) |
| 972 | goto fail; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 973 | if (options.check_host_ip && host_ip_differ) { |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 974 | char *key_msg; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 975 | if (ip_status == HOST_NEW) |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 976 | key_msg = "is unknown"; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 977 | else if (ip_status == HOST_OK) |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 978 | key_msg = "is unchanged"; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 979 | else |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 980 | key_msg = "has a different value"; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 981 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 982 | error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @"); |
| 983 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 984 | error("The %s host key for %s has changed,", type, host); |
Darren Tucker | ff4454d | 2008-06-13 10:21:51 +1000 | [diff] [blame] | 985 | error("and the key for the corresponding IP address %s", ip); |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 986 | error("%s. This could either mean that", key_msg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 987 | error("DNS SPOOFING is happening or the IP address for the host"); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 988 | error("and its host key have changed at the same time."); |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 989 | if (ip_status != HOST_NEW) |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 990 | error("Offending key for IP in %s:%lu", |
| 991 | ip_found->file, ip_found->line); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 992 | } |
| 993 | /* The host key has changed. */ |
Damien Miller | 5a38897 | 2003-11-17 21:10:47 +1100 | [diff] [blame] | 994 | warn_changed_key(host_key); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 995 | error("Add correct host key in %.100s to get rid of this message.", |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 996 | user_hostfiles[0]); |
markus@openbsd.org | beb965b | 2017-05-30 14:13:40 +0000 | [diff] [blame] | 997 | error("Offending %s key in %s:%lu", |
| 998 | sshkey_type(host_found->key), |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 999 | host_found->file, host_found->line); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1000 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1001 | /* |
| 1002 | * If strict host key checking is in use, the user will have |
| 1003 | * to edit the key manually and we can only abort. |
| 1004 | */ |
djm@openbsd.org | 22376d2 | 2017-09-03 23:33:13 +0000 | [diff] [blame] | 1005 | if (options.strict_host_key_checking != |
| 1006 | SSH_STRICT_HOSTKEY_OFF) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 1007 | error("%s host key for %.200s has changed and you have " |
| 1008 | "requested strict checking.", type, host); |
| 1009 | goto fail; |
| 1010 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1011 | |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 1012 | continue_unsafe: |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1013 | /* |
| 1014 | * If strict host key checking has not been requested, allow |
Damien Miller | 941ac45 | 2003-06-04 20:31:53 +1000 | [diff] [blame] | 1015 | * the connection but without MITM-able authentication or |
Damien Miller | 437edb9 | 2006-08-05 09:11:13 +1000 | [diff] [blame] | 1016 | * forwarding. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1017 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1018 | if (options.password_authentication) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 1019 | error("Password authentication is disabled to avoid " |
| 1020 | "man-in-the-middle attacks."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1021 | options.password_authentication = 0; |
Darren Tucker | 068e01f | 2008-07-02 22:33:55 +1000 | [diff] [blame] | 1022 | cancelled_forwarding = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1023 | } |
Damien Miller | 941ac45 | 2003-06-04 20:31:53 +1000 | [diff] [blame] | 1024 | if (options.kbd_interactive_authentication) { |
| 1025 | error("Keyboard-interactive authentication is disabled" |
| 1026 | " to avoid man-in-the-middle attacks."); |
| 1027 | options.kbd_interactive_authentication = 0; |
| 1028 | options.challenge_response_authentication = 0; |
Darren Tucker | 068e01f | 2008-07-02 22:33:55 +1000 | [diff] [blame] | 1029 | cancelled_forwarding = 1; |
Damien Miller | 941ac45 | 2003-06-04 20:31:53 +1000 | [diff] [blame] | 1030 | } |
| 1031 | if (options.challenge_response_authentication) { |
| 1032 | error("Challenge/response authentication is disabled" |
| 1033 | " to avoid man-in-the-middle attacks."); |
| 1034 | options.challenge_response_authentication = 0; |
Darren Tucker | 068e01f | 2008-07-02 22:33:55 +1000 | [diff] [blame] | 1035 | cancelled_forwarding = 1; |
Damien Miller | 941ac45 | 2003-06-04 20:31:53 +1000 | [diff] [blame] | 1036 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1037 | if (options.forward_agent) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 1038 | error("Agent forwarding is disabled to avoid " |
| 1039 | "man-in-the-middle attacks."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1040 | options.forward_agent = 0; |
Darren Tucker | 068e01f | 2008-07-02 22:33:55 +1000 | [diff] [blame] | 1041 | cancelled_forwarding = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1042 | } |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 1043 | if (options.forward_x11) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 1044 | error("X11 forwarding is disabled to avoid " |
| 1045 | "man-in-the-middle attacks."); |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 1046 | options.forward_x11 = 0; |
Darren Tucker | 068e01f | 2008-07-02 22:33:55 +1000 | [diff] [blame] | 1047 | cancelled_forwarding = 1; |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 1048 | } |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 1049 | if (options.num_local_forwards > 0 || |
| 1050 | options.num_remote_forwards > 0) { |
| 1051 | error("Port forwarding is disabled to avoid " |
| 1052 | "man-in-the-middle attacks."); |
| 1053 | options.num_local_forwards = |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1054 | options.num_remote_forwards = 0; |
Darren Tucker | 068e01f | 2008-07-02 22:33:55 +1000 | [diff] [blame] | 1055 | cancelled_forwarding = 1; |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 1056 | } |
Damien Miller | 437edb9 | 2006-08-05 09:11:13 +1000 | [diff] [blame] | 1057 | if (options.tun_open != SSH_TUNMODE_NO) { |
| 1058 | error("Tunnel forwarding is disabled to avoid " |
| 1059 | "man-in-the-middle attacks."); |
| 1060 | options.tun_open = SSH_TUNMODE_NO; |
Darren Tucker | 068e01f | 2008-07-02 22:33:55 +1000 | [diff] [blame] | 1061 | cancelled_forwarding = 1; |
Damien Miller | 437edb9 | 2006-08-05 09:11:13 +1000 | [diff] [blame] | 1062 | } |
Darren Tucker | 068e01f | 2008-07-02 22:33:55 +1000 | [diff] [blame] | 1063 | if (options.exit_on_forward_failure && cancelled_forwarding) |
| 1064 | fatal("Error: forwarding disabled due to host key " |
| 1065 | "check failure"); |
| 1066 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1067 | /* |
| 1068 | * XXX Should permit the user to change to use the new id. |
| 1069 | * This could be done by converting the host key to an |
| 1070 | * identifying sentence, tell that the host identifies itself |
Darren Tucker | e2b3674 | 2010-01-13 22:42:34 +1100 | [diff] [blame] | 1071 | * by that sentence, and ask the user if he/she wishes to |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1072 | * accept the authentication. |
| 1073 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1074 | break; |
Ben Lindstrom | 3ed6640 | 2002-08-01 01:21:56 +0000 | [diff] [blame] | 1075 | case HOST_FOUND: |
| 1076 | fatal("internal error"); |
| 1077 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1078 | } |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 1079 | |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 1080 | if (options.check_host_ip && host_status != HOST_CHANGED && |
| 1081 | ip_status == HOST_CHANGED) { |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 1082 | snprintf(msg, sizeof(msg), |
| 1083 | "Warning: the %s host key for '%.200s' " |
| 1084 | "differs from the key for the IP address '%.128s'" |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1085 | "\nOffending key for IP in %s:%lu", |
| 1086 | type, host, ip, ip_found->file, ip_found->line); |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 1087 | if (host_status == HOST_OK) { |
| 1088 | len = strlen(msg); |
| 1089 | snprintf(msg + len, sizeof(msg) - len, |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1090 | "\nMatching host key in %s:%lu", |
| 1091 | host_found->file, host_found->line); |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 1092 | } |
djm@openbsd.org | 22376d2 | 2017-09-03 23:33:13 +0000 | [diff] [blame] | 1093 | if (options.strict_host_key_checking == |
| 1094 | SSH_STRICT_HOSTKEY_ASK) { |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 1095 | strlcat(msg, "\nAre you sure you want " |
| 1096 | "to continue connecting (yes/no)? ", sizeof(msg)); |
dtucker@openbsd.org | 05b9a46 | 2019-01-24 17:00:29 +0000 | [diff] [blame] | 1097 | if (!confirm(msg, NULL)) |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 1098 | goto fail; |
djm@openbsd.org | 22376d2 | 2017-09-03 23:33:13 +0000 | [diff] [blame] | 1099 | } else if (options.strict_host_key_checking != |
| 1100 | SSH_STRICT_HOSTKEY_OFF) { |
| 1101 | logit("%s", msg); |
| 1102 | error("Exiting, you have requested strict checking."); |
| 1103 | goto fail; |
Damien Miller | 49d795c | 2002-01-22 23:34:12 +1100 | [diff] [blame] | 1104 | } else { |
Damien Miller | ab2db41 | 2003-06-02 19:09:13 +1000 | [diff] [blame] | 1105 | logit("%s", msg); |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 1106 | } |
| 1107 | } |
| 1108 | |
djm@openbsd.org | 8d4f872 | 2015-01-26 03:04:45 +0000 | [diff] [blame] | 1109 | if (!hostkey_trusted && options.update_hostkeys) { |
| 1110 | debug("%s: hostkey not known or explicitly trusted: " |
| 1111 | "disabling UpdateHostkeys", __func__); |
| 1112 | options.update_hostkeys = 0; |
| 1113 | } |
| 1114 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1115 | free(ip); |
| 1116 | free(host); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1117 | if (host_hostkeys != NULL) |
| 1118 | free_hostkeys(host_hostkeys); |
| 1119 | if (ip_hostkeys != NULL) |
| 1120 | free_hostkeys(ip_hostkeys); |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 1121 | return 0; |
| 1122 | |
| 1123 | fail: |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 1124 | if (want_cert && host_status != HOST_REVOKED) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1125 | /* |
| 1126 | * No matching certificate. Downgrade cert to raw key and |
| 1127 | * search normally. |
| 1128 | */ |
| 1129 | debug("No matching CA found. Retry with plain key"); |
markus@openbsd.org | beb965b | 2017-05-30 14:13:40 +0000 | [diff] [blame] | 1130 | if ((r = sshkey_from_private(host_key, &raw_key)) != 0) |
| 1131 | fatal("%s: sshkey_from_private: %s", |
| 1132 | __func__, ssh_err(r)); |
| 1133 | if ((r = sshkey_drop_cert(raw_key)) != 0) |
| 1134 | fatal("Couldn't drop certificate: %s", ssh_err(r)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1135 | host_key = raw_key; |
| 1136 | goto retry; |
| 1137 | } |
dtucker@openbsd.org | f1f047f | 2018-02-07 22:52:45 +0000 | [diff] [blame] | 1138 | sshkey_free(raw_key); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1139 | free(ip); |
| 1140 | free(host); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1141 | if (host_hostkeys != NULL) |
| 1142 | free_hostkeys(host_hostkeys); |
| 1143 | if (ip_hostkeys != NULL) |
| 1144 | free_hostkeys(ip_hostkeys); |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 1145 | return -1; |
| 1146 | } |
| 1147 | |
Damien Miller | 37876e9 | 2003-05-15 10:19:46 +1000 | [diff] [blame] | 1148 | /* returns 0 if key verifies or -1 if key does NOT verify */ |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 1149 | int |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1150 | verify_host_key(char *host, struct sockaddr *hostaddr, struct sshkey *host_key) |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 1151 | { |
djm@openbsd.org | f96516d | 2015-11-19 01:09:38 +0000 | [diff] [blame] | 1152 | u_int i; |
Damien Miller | 6b37fbb | 2014-07-04 08:59:24 +1000 | [diff] [blame] | 1153 | int r = -1, flags = 0; |
djm@openbsd.org | f96516d | 2015-11-19 01:09:38 +0000 | [diff] [blame] | 1154 | char valid[64], *fp = NULL, *cafp = NULL; |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 1155 | struct sshkey *plain = NULL; |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1156 | |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 1157 | if ((fp = sshkey_fingerprint(host_key, |
djm@openbsd.org | 56d1c83 | 2014-12-21 22:27:55 +0000 | [diff] [blame] | 1158 | options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL) { |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 1159 | error("%s: fingerprint host key: %s", __func__, ssh_err(r)); |
| 1160 | r = -1; |
| 1161 | goto out; |
| 1162 | } |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 1163 | |
djm@openbsd.org | f96516d | 2015-11-19 01:09:38 +0000 | [diff] [blame] | 1164 | if (sshkey_is_cert(host_key)) { |
| 1165 | if ((cafp = sshkey_fingerprint(host_key->cert->signature_key, |
| 1166 | options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL) { |
| 1167 | error("%s: fingerprint CA key: %s", |
| 1168 | __func__, ssh_err(r)); |
| 1169 | r = -1; |
| 1170 | goto out; |
| 1171 | } |
| 1172 | sshkey_format_cert_validity(host_key->cert, |
| 1173 | valid, sizeof(valid)); |
| 1174 | debug("Server host certificate: %s %s, serial %llu " |
| 1175 | "ID \"%s\" CA %s %s valid %s", |
| 1176 | sshkey_ssh_name(host_key), fp, |
djm@openbsd.org | 8ca915f | 2015-11-20 01:45:29 +0000 | [diff] [blame] | 1177 | (unsigned long long)host_key->cert->serial, |
| 1178 | host_key->cert->key_id, |
djm@openbsd.org | f96516d | 2015-11-19 01:09:38 +0000 | [diff] [blame] | 1179 | sshkey_ssh_name(host_key->cert->signature_key), cafp, |
| 1180 | valid); |
| 1181 | for (i = 0; i < host_key->cert->nprincipals; i++) { |
| 1182 | debug2("Server host certificate hostname: %s", |
| 1183 | host_key->cert->principals[i]); |
| 1184 | } |
| 1185 | } else { |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 1186 | debug("Server host key: %s %s", sshkey_ssh_name(host_key), fp); |
djm@openbsd.org | f96516d | 2015-11-19 01:09:38 +0000 | [diff] [blame] | 1187 | } |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 1188 | |
| 1189 | if (sshkey_equal(previous_host_key, host_key)) { |
| 1190 | debug2("%s: server host key %s %s matches cached key", |
| 1191 | __func__, sshkey_type(host_key), fp); |
| 1192 | r = 0; |
| 1193 | goto out; |
| 1194 | } |
| 1195 | |
| 1196 | /* Check in RevokedHostKeys file if specified */ |
| 1197 | if (options.revoked_host_keys != NULL) { |
| 1198 | r = sshkey_check_revoked(host_key, options.revoked_host_keys); |
| 1199 | switch (r) { |
| 1200 | case 0: |
| 1201 | break; /* not revoked */ |
| 1202 | case SSH_ERR_KEY_REVOKED: |
| 1203 | error("Host key %s %s revoked by file %s", |
| 1204 | sshkey_type(host_key), fp, |
| 1205 | options.revoked_host_keys); |
| 1206 | r = -1; |
| 1207 | goto out; |
| 1208 | default: |
| 1209 | error("Error checking host key %s %s in " |
| 1210 | "revoked keys file %s: %s", sshkey_type(host_key), |
| 1211 | fp, options.revoked_host_keys, ssh_err(r)); |
| 1212 | r = -1; |
| 1213 | goto out; |
| 1214 | } |
Damien Miller | 6b37fbb | 2014-07-04 08:59:24 +1000 | [diff] [blame] | 1215 | } |
| 1216 | |
Damien Miller | 7d6a9fb | 2014-04-20 13:23:43 +1000 | [diff] [blame] | 1217 | if (options.verify_host_key_dns) { |
| 1218 | /* |
| 1219 | * XXX certs are not yet supported for DNS, so downgrade |
| 1220 | * them and try the plain key. |
| 1221 | */ |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 1222 | if ((r = sshkey_from_private(host_key, &plain)) != 0) |
| 1223 | goto out; |
| 1224 | if (sshkey_is_cert(plain)) |
| 1225 | sshkey_drop_cert(plain); |
Damien Miller | 7d6a9fb | 2014-04-20 13:23:43 +1000 | [diff] [blame] | 1226 | if (verify_host_key_dns(host, hostaddr, plain, &flags) == 0) { |
| 1227 | if (flags & DNS_VERIFY_FOUND) { |
| 1228 | if (options.verify_host_key_dns == 1 && |
| 1229 | flags & DNS_VERIFY_MATCH && |
| 1230 | flags & DNS_VERIFY_SECURE) { |
Damien Miller | 6b37fbb | 2014-07-04 08:59:24 +1000 | [diff] [blame] | 1231 | r = 0; |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 1232 | goto out; |
Damien Miller | 7d6a9fb | 2014-04-20 13:23:43 +1000 | [diff] [blame] | 1233 | } |
| 1234 | if (flags & DNS_VERIFY_MATCH) { |
| 1235 | matching_host_key_dns = 1; |
| 1236 | } else { |
djm@openbsd.org | aea59a0 | 2017-09-14 04:32:21 +0000 | [diff] [blame] | 1237 | warn_changed_key(plain); |
| 1238 | error("Update the SSHFP RR in DNS " |
| 1239 | "with the new host key to get rid " |
| 1240 | "of this message."); |
Damien Miller | 7d6a9fb | 2014-04-20 13:23:43 +1000 | [diff] [blame] | 1241 | } |
Damien Miller | 150b557 | 2003-11-17 21:19:29 +1100 | [diff] [blame] | 1242 | } |
Damien Miller | 37876e9 | 2003-05-15 10:19:46 +1000 | [diff] [blame] | 1243 | } |
| 1244 | } |
Damien Miller | 6b37fbb | 2014-07-04 08:59:24 +1000 | [diff] [blame] | 1245 | r = check_host_key(host, hostaddr, options.port, host_key, RDRW, |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 1246 | options.user_hostfiles, options.num_user_hostfiles, |
| 1247 | options.system_hostfiles, options.num_system_hostfiles); |
Damien Miller | 6b37fbb | 2014-07-04 08:59:24 +1000 | [diff] [blame] | 1248 | |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 1249 | out: |
| 1250 | sshkey_free(plain); |
| 1251 | free(fp); |
djm@openbsd.org | f96516d | 2015-11-19 01:09:38 +0000 | [diff] [blame] | 1252 | free(cafp); |
Damien Miller | 6b37fbb | 2014-07-04 08:59:24 +1000 | [diff] [blame] | 1253 | if (r == 0 && host_key != NULL) { |
markus@openbsd.org | beb965b | 2017-05-30 14:13:40 +0000 | [diff] [blame] | 1254 | sshkey_free(previous_host_key); |
| 1255 | r = sshkey_from_private(host_key, &previous_host_key); |
Damien Miller | 6b37fbb | 2014-07-04 08:59:24 +1000 | [diff] [blame] | 1256 | } |
| 1257 | |
| 1258 | return r; |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 1259 | } |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 1260 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1261 | /* |
| 1262 | * Starts a dialog with the server, and authenticates the current user on the |
| 1263 | * server. This does not need any extra privileges. The basic connection |
| 1264 | * to the server must already have been established before this is called. |
| 1265 | * If login fails, this function prints an error and never returns. |
| 1266 | * This function does not require super-user privileges. |
| 1267 | */ |
| 1268 | void |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 1269 | ssh_login(struct ssh *ssh, Sensitive *sensitive, const char *orighost, |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1270 | struct sockaddr *hostaddr, u_short port, struct passwd *pw, int timeout_ms) |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1271 | { |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 1272 | char *host; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1273 | char *server_user, *local_user; |
| 1274 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1275 | local_user = xstrdup(pw->pw_name); |
| 1276 | server_user = options.user ? options.user : local_user; |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1277 | |
| 1278 | /* Convert the user-supplied hostname into all lowercase. */ |
| 1279 | host = xstrdup(orighost); |
Damien Miller | 0faf747 | 2013-10-17 11:47:23 +1100 | [diff] [blame] | 1280 | lowercase(host); |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1281 | |
| 1282 | /* Exchange protocol version identification strings with the server. */ |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 1283 | if (kex_exchange_identification(ssh, timeout_ms, NULL) != 0) |
| 1284 | cleanup_exit(255); /* error already logged */ |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1285 | |
| 1286 | /* Put the connection into non-blocking mode. */ |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 1287 | ssh_packet_set_nonblocking(ssh); |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1288 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1289 | /* key exchange */ |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1290 | /* authenticate user */ |
dtucker@openbsd.org | bb2289e | 2015-04-14 04:17:03 +0000 | [diff] [blame] | 1291 | debug("Authenticating to %s:%d as '%s'", host, port, server_user); |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 1292 | ssh_kex2(ssh, host, hostaddr, port); |
| 1293 | ssh_userauth2(ssh, local_user, server_user, host, sensitive); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1294 | free(local_user); |
dtucker@openbsd.org | 1c554a5 | 2019-05-03 03:27:38 +0000 | [diff] [blame] | 1295 | free(host); |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1296 | } |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1297 | |
Ben Lindstrom | 3ed6640 | 2002-08-01 01:21:56 +0000 | [diff] [blame] | 1298 | /* print all known host keys for a given host, but skip keys of given type */ |
| 1299 | static int |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1300 | show_other_keys(struct hostkeys *hostkeys, struct sshkey *key) |
Ben Lindstrom | 3ed6640 | 2002-08-01 01:21:56 +0000 | [diff] [blame] | 1301 | { |
Damien Miller | 106bf1c | 2013-12-29 17:54:03 +1100 | [diff] [blame] | 1302 | int type[] = { |
Damien Miller | 106bf1c | 2013-12-29 17:54:03 +1100 | [diff] [blame] | 1303 | KEY_RSA, |
| 1304 | KEY_DSA, |
| 1305 | KEY_ECDSA, |
| 1306 | KEY_ED25519, |
markus@openbsd.org | 1b11ea7 | 2018-02-23 15:58:37 +0000 | [diff] [blame] | 1307 | KEY_XMSS, |
Damien Miller | 106bf1c | 2013-12-29 17:54:03 +1100 | [diff] [blame] | 1308 | -1 |
| 1309 | }; |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1310 | int i, ret = 0; |
| 1311 | char *fp, *ra; |
| 1312 | const struct hostkey_entry *found; |
Ben Lindstrom | 3ed6640 | 2002-08-01 01:21:56 +0000 | [diff] [blame] | 1313 | |
| 1314 | for (i = 0; type[i] != -1; i++) { |
| 1315 | if (type[i] == key->type) |
| 1316 | continue; |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1317 | if (!lookup_key_in_hostkeys_by_type(hostkeys, type[i], &found)) |
Ben Lindstrom | 3ed6640 | 2002-08-01 01:21:56 +0000 | [diff] [blame] | 1318 | continue; |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 1319 | fp = sshkey_fingerprint(found->key, |
djm@openbsd.org | 56d1c83 | 2014-12-21 22:27:55 +0000 | [diff] [blame] | 1320 | options.fingerprint_hash, SSH_FP_DEFAULT); |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 1321 | ra = sshkey_fingerprint(found->key, |
djm@openbsd.org | 56d1c83 | 2014-12-21 22:27:55 +0000 | [diff] [blame] | 1322 | options.fingerprint_hash, SSH_FP_RANDOMART); |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 1323 | if (fp == NULL || ra == NULL) |
| 1324 | fatal("%s: sshkey_fingerprint fail", __func__); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1325 | logit("WARNING: %s key found for host %s\n" |
| 1326 | "in %s:%lu\n" |
| 1327 | "%s key fingerprint %s.", |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1328 | sshkey_type(found->key), |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1329 | found->host, found->file, found->line, |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1330 | sshkey_type(found->key), fp); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1331 | if (options.visual_host_key) |
| 1332 | logit("%s", ra); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1333 | free(ra); |
| 1334 | free(fp); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1335 | ret = 1; |
Ben Lindstrom | 3ed6640 | 2002-08-01 01:21:56 +0000 | [diff] [blame] | 1336 | } |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 1337 | return ret; |
Ben Lindstrom | 3ed6640 | 2002-08-01 01:21:56 +0000 | [diff] [blame] | 1338 | } |
Damien Miller | 5a38897 | 2003-11-17 21:10:47 +1100 | [diff] [blame] | 1339 | |
| 1340 | static void |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1341 | warn_changed_key(struct sshkey *host_key) |
Damien Miller | 5a38897 | 2003-11-17 21:10:47 +1100 | [diff] [blame] | 1342 | { |
| 1343 | char *fp; |
Damien Miller | 5a38897 | 2003-11-17 21:10:47 +1100 | [diff] [blame] | 1344 | |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 1345 | fp = sshkey_fingerprint(host_key, options.fingerprint_hash, |
djm@openbsd.org | 56d1c83 | 2014-12-21 22:27:55 +0000 | [diff] [blame] | 1346 | SSH_FP_DEFAULT); |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 1347 | if (fp == NULL) |
| 1348 | fatal("%s: sshkey_fingerprint fail", __func__); |
Damien Miller | 5a38897 | 2003-11-17 21:10:47 +1100 | [diff] [blame] | 1349 | |
| 1350 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 1351 | error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @"); |
| 1352 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 1353 | error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!"); |
| 1354 | error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!"); |
Damien Miller | 05c8997 | 2011-01-06 22:42:04 +1100 | [diff] [blame] | 1355 | error("It is also possible that a host key has just been changed."); |
Damien Miller | 5a38897 | 2003-11-17 21:10:47 +1100 | [diff] [blame] | 1356 | error("The fingerprint for the %s key sent by the remote host is\n%s.", |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1357 | sshkey_type(host_key), fp); |
Damien Miller | 5a38897 | 2003-11-17 21:10:47 +1100 | [diff] [blame] | 1358 | error("Please contact your system administrator."); |
| 1359 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1360 | free(fp); |
Damien Miller | 5a38897 | 2003-11-17 21:10:47 +1100 | [diff] [blame] | 1361 | } |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1362 | |
| 1363 | /* |
| 1364 | * Execute a local command |
| 1365 | */ |
| 1366 | int |
| 1367 | ssh_local_cmd(const char *args) |
| 1368 | { |
| 1369 | char *shell; |
| 1370 | pid_t pid; |
| 1371 | int status; |
Damien Miller | ed3a8eb | 2011-01-07 10:02:52 +1100 | [diff] [blame] | 1372 | void (*osighand)(int); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1373 | |
| 1374 | if (!options.permit_local_command || |
| 1375 | args == NULL || !*args) |
| 1376 | return (1); |
| 1377 | |
Damien Miller | 38d9a96 | 2010-10-07 22:07:11 +1100 | [diff] [blame] | 1378 | if ((shell = getenv("SHELL")) == NULL || *shell == '\0') |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1379 | shell = _PATH_BSHELL; |
| 1380 | |
Damien Miller | ed3a8eb | 2011-01-07 10:02:52 +1100 | [diff] [blame] | 1381 | osighand = signal(SIGCHLD, SIG_DFL); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1382 | pid = fork(); |
| 1383 | if (pid == 0) { |
Damien Miller | 6fb6fd5 | 2011-01-16 23:17:45 +1100 | [diff] [blame] | 1384 | signal(SIGPIPE, SIG_DFL); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1385 | debug3("Executing %s -c \"%s\"", shell, args); |
| 1386 | execl(shell, shell, "-c", args, (char *)NULL); |
| 1387 | error("Couldn't execute %s -c \"%s\": %s", |
| 1388 | shell, args, strerror(errno)); |
| 1389 | _exit(1); |
| 1390 | } else if (pid == -1) |
| 1391 | fatal("fork failed: %.100s", strerror(errno)); |
| 1392 | while (waitpid(pid, &status, 0) == -1) |
| 1393 | if (errno != EINTR) |
| 1394 | fatal("Couldn't wait for child: %s", strerror(errno)); |
Damien Miller | ed3a8eb | 2011-01-07 10:02:52 +1100 | [diff] [blame] | 1395 | signal(SIGCHLD, osighand); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1396 | |
| 1397 | if (!WIFEXITED(status)) |
| 1398 | return (1); |
| 1399 | |
| 1400 | return (WEXITSTATUS(status)); |
| 1401 | } |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1402 | |
| 1403 | void |
djm@openbsd.org | d9e5cf0 | 2018-02-10 09:25:34 +0000 | [diff] [blame] | 1404 | maybe_add_key_to_agent(char *authfile, const struct sshkey *private, |
| 1405 | char *comment, char *passphrase) |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1406 | { |
| 1407 | int auth_sock = -1, r; |
| 1408 | |
| 1409 | if (options.add_keys_to_agent == 0) |
| 1410 | return; |
| 1411 | |
| 1412 | if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) { |
| 1413 | debug3("no authentication agent, not adding key"); |
| 1414 | return; |
| 1415 | } |
| 1416 | |
| 1417 | if (options.add_keys_to_agent == 2 && |
| 1418 | !ask_permission("Add key %s (%s) to agent?", authfile, comment)) { |
| 1419 | debug3("user denied adding this key"); |
dtucker@openbsd.org | 566b3a4 | 2017-03-10 03:22:40 +0000 | [diff] [blame] | 1420 | close(auth_sock); |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1421 | return; |
| 1422 | } |
| 1423 | |
| 1424 | if ((r = ssh_add_identity_constrained(auth_sock, private, comment, 0, |
markus@openbsd.org | 1b11ea7 | 2018-02-23 15:58:37 +0000 | [diff] [blame] | 1425 | (options.add_keys_to_agent == 3), 0)) == 0) |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1426 | debug("identity added to agent: %s", authfile); |
| 1427 | else |
| 1428 | debug("could not add identity to agent: %s (%d)", authfile, r); |
dtucker@openbsd.org | 566b3a4 | 2017-03-10 03:22:40 +0000 | [diff] [blame] | 1429 | close(auth_sock); |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1430 | } |