Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 5 | * Code to connect to a remote host, and to perform the client side of the |
| 6 | * login (authentication) dialog. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 7 | * |
| 8 | * As far as I am concerned, the code I have written for this software |
| 9 | * can be used freely for any purpose. Any derived versions of this |
| 10 | * software must be clearly marked as such, and if the derived work is |
| 11 | * incompatible with the protocol description in the RFC file, it must be |
| 12 | * called by a name other than "ssh" or "Secure Shell". |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 13 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 14 | |
| 15 | #include "includes.h" |
Damien Miller | 59d9fb9 | 2001-10-10 15:03:11 +1000 | [diff] [blame^] | 16 | RCSID("$OpenBSD: sshconnect.c,v 1.113 2001/10/06 11:18:19 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 17 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 18 | #include <openssl/bn.h> |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 19 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 20 | #include "ssh.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 21 | #include "xmalloc.h" |
| 22 | #include "rsa.h" |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 23 | #include "buffer.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 24 | #include "packet.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 25 | #include "uidswap.h" |
| 26 | #include "compat.h" |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 27 | #include "key.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 28 | #include "sshconnect.h" |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 29 | #include "hostfile.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 30 | #include "log.h" |
| 31 | #include "readconf.h" |
| 32 | #include "atomicio.h" |
| 33 | #include "misc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 34 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 35 | char *client_version_string = NULL; |
| 36 | char *server_version_string = NULL; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 37 | |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 38 | extern Options options; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 39 | extern char *__progname; |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 40 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 41 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
| 42 | extern int IPv4or6; |
| 43 | |
Tim Rice | e991e3c | 2001-08-07 15:29:07 -0700 | [diff] [blame] | 44 | #ifndef INET6_ADDRSTRLEN /* for non IPv6 machines */ |
| 45 | #define INET6_ADDRSTRLEN 46 |
| 46 | #endif |
| 47 | |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 48 | static const char * |
| 49 | sockaddr_ntop(struct sockaddr *sa) |
| 50 | { |
| 51 | void *addr; |
| 52 | static char addrbuf[INET6_ADDRSTRLEN]; |
| 53 | |
| 54 | switch (sa->sa_family) { |
| 55 | case AF_INET: |
| 56 | addr = &((struct sockaddr_in *)sa)->sin_addr; |
| 57 | break; |
| 58 | case AF_INET6: |
| 59 | addr = &((struct sockaddr_in6 *)sa)->sin6_addr; |
| 60 | break; |
| 61 | default: |
| 62 | /* This case should be protected against elsewhere */ |
| 63 | abort(); |
| 64 | } |
| 65 | inet_ntop(sa->sa_family, addr, addrbuf, sizeof(addrbuf)); |
| 66 | return addrbuf; |
| 67 | } |
| 68 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 69 | /* |
| 70 | * Connect to the given ssh server using a proxy command. |
| 71 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 72 | static int |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 73 | ssh_proxy_connect(const char *host, u_short port, struct passwd *pw, |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 74 | const char *proxy_command) |
| 75 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 76 | Buffer command; |
| 77 | const char *cp; |
| 78 | char *command_string; |
| 79 | int pin[2], pout[2]; |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 80 | pid_t pid; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 81 | char strport[NI_MAXSERV]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 82 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 83 | /* Convert the port number into a string. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 84 | snprintf(strport, sizeof strport, "%hu", port); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 85 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 86 | /* Build the final command string in the buffer by making the |
| 87 | appropriate substitutions to the given proxy command. */ |
| 88 | buffer_init(&command); |
| 89 | for (cp = proxy_command; *cp; cp++) { |
| 90 | if (cp[0] == '%' && cp[1] == '%') { |
| 91 | buffer_append(&command, "%", 1); |
| 92 | cp++; |
| 93 | continue; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 94 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 95 | if (cp[0] == '%' && cp[1] == 'h') { |
| 96 | buffer_append(&command, host, strlen(host)); |
| 97 | cp++; |
| 98 | continue; |
| 99 | } |
| 100 | if (cp[0] == '%' && cp[1] == 'p') { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 101 | buffer_append(&command, strport, strlen(strport)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 102 | cp++; |
| 103 | continue; |
| 104 | } |
| 105 | buffer_append(&command, cp, 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 106 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 107 | buffer_append(&command, "\0", 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 108 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 109 | /* Get the final command string. */ |
| 110 | command_string = buffer_ptr(&command); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 111 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 112 | /* Create pipes for communicating with the proxy. */ |
| 113 | if (pipe(pin) < 0 || pipe(pout) < 0) |
| 114 | fatal("Could not create pipes to communicate with the proxy: %.100s", |
| 115 | strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 116 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 117 | debug("Executing proxy command: %.500s", command_string); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 118 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 119 | /* Fork and execute the proxy command. */ |
| 120 | if ((pid = fork()) == 0) { |
| 121 | char *argv[10]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 122 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 123 | /* Child. Permanently give up superuser privileges. */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 124 | permanently_set_uid(pw); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 125 | |
| 126 | /* Redirect stdin and stdout. */ |
| 127 | close(pin[1]); |
| 128 | if (pin[0] != 0) { |
| 129 | if (dup2(pin[0], 0) < 0) |
| 130 | perror("dup2 stdin"); |
| 131 | close(pin[0]); |
| 132 | } |
| 133 | close(pout[0]); |
| 134 | if (dup2(pout[1], 1) < 0) |
| 135 | perror("dup2 stdout"); |
| 136 | /* Cannot be 1 because pin allocated two descriptors. */ |
| 137 | close(pout[1]); |
| 138 | |
| 139 | /* Stderr is left as it is so that error messages get |
| 140 | printed on the user's terminal. */ |
Damien Miller | 7b413d2 | 2000-07-01 13:24:21 +1000 | [diff] [blame] | 141 | argv[0] = _PATH_BSHELL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 142 | argv[1] = "-c"; |
| 143 | argv[2] = command_string; |
| 144 | argv[3] = NULL; |
| 145 | |
| 146 | /* Execute the proxy command. Note that we gave up any |
| 147 | extra privileges above. */ |
Kevin Steves | fcd5d60 | 2001-01-07 11:45:22 +0000 | [diff] [blame] | 148 | execv(argv[0], argv); |
| 149 | perror(argv[0]); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 150 | exit(1); |
| 151 | } |
| 152 | /* Parent. */ |
| 153 | if (pid < 0) |
| 154 | fatal("fork failed: %.100s", strerror(errno)); |
| 155 | |
| 156 | /* Close child side of the descriptors. */ |
| 157 | close(pin[0]); |
| 158 | close(pout[1]); |
| 159 | |
| 160 | /* Free the command name. */ |
| 161 | buffer_free(&command); |
| 162 | |
| 163 | /* Set the connection file descriptors. */ |
| 164 | packet_set_connection(pout[0], pin[1]); |
| 165 | |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 166 | /* Indicate OK return */ |
| 167 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 168 | } |
| 169 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 170 | /* |
| 171 | * Creates a (possibly privileged) socket for use as the ssh connection. |
| 172 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 173 | static int |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 174 | ssh_create_socket(struct passwd *pw, int privileged, int family) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 175 | { |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 176 | int sock, gaierr; |
| 177 | struct addrinfo hints, *res; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 178 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 179 | /* |
| 180 | * If we are running as root and want to connect to a privileged |
| 181 | * port, bind our own socket to a privileged port. |
| 182 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 183 | if (privileged) { |
| 184 | int p = IPPORT_RESERVED - 1; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 185 | sock = rresvport_af(&p, family); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 186 | if (sock < 0) |
Damien Miller | 98c7ad6 | 2000-03-09 21:27:49 +1100 | [diff] [blame] | 187 | error("rresvport: af=%d %.100s", family, strerror(errno)); |
| 188 | else |
| 189 | debug("Allocated local port %d.", p); |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 190 | return sock; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 191 | } |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 192 | /* |
| 193 | * Just create an ordinary socket on arbitrary port. We use |
| 194 | * the user's uid to create the socket. |
| 195 | */ |
| 196 | temporarily_use_uid(pw); |
| 197 | sock = socket(family, SOCK_STREAM, 0); |
| 198 | if (sock < 0) |
| 199 | error("socket: %.100s", strerror(errno)); |
| 200 | restore_uid(); |
| 201 | |
| 202 | /* Bind the socket to an alternative local IP address */ |
| 203 | if (options.bind_address == NULL) |
| 204 | return sock; |
| 205 | |
| 206 | memset(&hints, 0, sizeof(hints)); |
| 207 | hints.ai_family = IPv4or6; |
| 208 | hints.ai_socktype = SOCK_STREAM; |
| 209 | hints.ai_flags = AI_PASSIVE; |
| 210 | gaierr = getaddrinfo(options.bind_address, "0", &hints, &res); |
| 211 | if (gaierr) { |
| 212 | error("getaddrinfo: %s: %s", options.bind_address, |
| 213 | gai_strerror(gaierr)); |
| 214 | close(sock); |
| 215 | return -1; |
| 216 | } |
| 217 | if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) { |
| 218 | error("bind: %s: %s", options.bind_address, strerror(errno)); |
| 219 | close(sock); |
| 220 | freeaddrinfo(res); |
| 221 | return -1; |
| 222 | } |
| 223 | freeaddrinfo(res); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 224 | return sock; |
| 225 | } |
| 226 | |
| 227 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 228 | * Opens a TCP/IP connection to the remote server on the given host. |
| 229 | * The address of the remote host will be returned in hostaddr. |
| 230 | * If port is 0, the default port will be used. If anonymous is zero, |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 231 | * a privileged port will be allocated to make the connection. |
| 232 | * This requires super-user privileges if anonymous is false. |
| 233 | * Connection_attempts specifies the maximum number of tries (one per |
| 234 | * second). If proxy_command is non-NULL, it specifies the command (with %h |
| 235 | * and %p substituted for host and port, respectively) to use to contact |
| 236 | * the daemon. |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 237 | * Return values: |
| 238 | * 0 for OK |
| 239 | * ECONNREFUSED if we got a "Connection Refused" by the peer on any address |
| 240 | * ECONNABORTED if we failed without a "Connection refused" |
| 241 | * Suitable error messages for the connection failure will already have been |
| 242 | * printed. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 243 | */ |
| 244 | int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 245 | ssh_connect(const char *host, struct sockaddr_storage * hostaddr, |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 246 | u_short port, int connection_attempts, |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 247 | int anonymous, struct passwd *pw, |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 248 | const char *proxy_command) |
| 249 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 250 | int gaierr; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 251 | int on = 1; |
| 252 | int sock = -1, attempt; |
| 253 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| 254 | struct addrinfo hints, *ai, *aitop; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 255 | struct linger linger; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 256 | struct servent *sp; |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 257 | /* |
| 258 | * Did we get only other errors than "Connection refused" (which |
| 259 | * should block fallback to rsh and similar), or did we get at least |
| 260 | * one "Connection refused"? |
| 261 | */ |
| 262 | int full_failure = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 263 | |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 264 | debug("ssh_connect: getuid %u geteuid %u anon %d", |
| 265 | (u_int) getuid(), (u_int) geteuid(), anonymous); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 266 | |
| 267 | /* Get default port if port has not been set. */ |
| 268 | if (port == 0) { |
| 269 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); |
| 270 | if (sp) |
| 271 | port = ntohs(sp->s_port); |
| 272 | else |
| 273 | port = SSH_DEFAULT_PORT; |
| 274 | } |
| 275 | /* If a proxy command is given, connect using it. */ |
| 276 | if (proxy_command != NULL) |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 277 | return ssh_proxy_connect(host, port, pw, proxy_command); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 278 | |
| 279 | /* No proxy command. */ |
| 280 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 281 | memset(&hints, 0, sizeof(hints)); |
| 282 | hints.ai_family = IPv4or6; |
| 283 | hints.ai_socktype = SOCK_STREAM; |
| 284 | snprintf(strport, sizeof strport, "%d", port); |
| 285 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) |
| 286 | fatal("%s: %.100s: %s", __progname, host, |
| 287 | gai_strerror(gaierr)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 288 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 289 | /* |
| 290 | * Try to connect several times. On some machines, the first time |
| 291 | * will sometimes fail. In general socket code appears to behave |
| 292 | * quite magically on many machines. |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 293 | */ |
| 294 | for (attempt = 0; ;) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 295 | if (attempt > 0) |
| 296 | debug("Trying again..."); |
| 297 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 298 | /* Loop through addresses for this host, and try each one in |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 299 | sequence until the connection succeeds. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 300 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 301 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 302 | continue; |
| 303 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, |
| 304 | ntop, sizeof(ntop), strport, sizeof(strport), |
| 305 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
| 306 | error("ssh_connect: getnameinfo failed"); |
| 307 | continue; |
| 308 | } |
| 309 | debug("Connecting to %.200s [%.100s] port %s.", |
| 310 | host, ntop, strport); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 311 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 312 | /* Create a socket for connecting. */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 313 | sock = ssh_create_socket(pw, |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 314 | #ifdef HAVE_CYGWIN |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 315 | !anonymous, |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 316 | #else |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 317 | !anonymous && geteuid() == 0, |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 318 | #endif |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 319 | ai->ai_family); |
| 320 | if (sock < 0) |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 321 | /* Any error is already output */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 322 | continue; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 323 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 324 | /* Connect to the host. We use the user's uid in the |
| 325 | * hope that it will help with tcp_wrappers showing |
| 326 | * the remote uid as root. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 327 | */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 328 | temporarily_use_uid(pw); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 329 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) >= 0) { |
| 330 | /* Successful connection. */ |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 331 | memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 332 | restore_uid(); |
| 333 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 334 | } else { |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 335 | if (errno == ECONNREFUSED) |
| 336 | full_failure = 0; |
| 337 | log("ssh: connect to address %s port %s: %s", |
| 338 | sockaddr_ntop(ai->ai_addr), strport, |
| 339 | strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 340 | restore_uid(); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 341 | /* |
| 342 | * Close the failed socket; there appear to |
| 343 | * be some problems when reusing a socket for |
| 344 | * which connect() has already returned an |
| 345 | * error. |
| 346 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 347 | shutdown(sock, SHUT_RDWR); |
| 348 | close(sock); |
| 349 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 350 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 351 | if (ai) |
| 352 | break; /* Successful connection. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 353 | |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 354 | attempt++; |
| 355 | if (attempt >= connection_attempts) |
| 356 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 357 | /* Sleep a moment before retrying. */ |
| 358 | sleep(1); |
| 359 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 360 | |
| 361 | freeaddrinfo(aitop); |
| 362 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 363 | /* Return failure if we didn't get a successful connection. */ |
| 364 | if (attempt >= connection_attempts) |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 365 | return full_failure ? ECONNABORTED : ECONNREFUSED; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 366 | |
| 367 | debug("Connection established."); |
| 368 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 369 | /* |
| 370 | * Set socket options. We would like the socket to disappear as soon |
| 371 | * as it has been closed for whatever reason. |
| 372 | */ |
| 373 | /* setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 374 | linger.l_onoff = 1; |
| 375 | linger.l_linger = 5; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 376 | setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); |
| 377 | |
| 378 | /* Set keepalives if requested. */ |
| 379 | if (options.keepalives && |
| 380 | setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, |
| 381 | sizeof(on)) < 0) |
| 382 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 383 | |
| 384 | /* Set the connection. */ |
| 385 | packet_set_connection(sock, sock); |
| 386 | |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 387 | return 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 388 | } |
| 389 | |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 390 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 391 | * Waits for the server identification string, and sends our own |
| 392 | * identification string. |
| 393 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 394 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 395 | ssh_exchange_identification(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 396 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 397 | char buf[256], remote_version[256]; /* must be same size! */ |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 398 | int remote_major, remote_minor, i, mismatch; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 399 | int connection_in = packet_get_connection_in(); |
| 400 | int connection_out = packet_get_connection_out(); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 401 | int minor1 = PROTOCOL_MINOR_1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 402 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 403 | /* Read other side\'s version identification. */ |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 404 | for (;;) { |
| 405 | for (i = 0; i < sizeof(buf) - 1; i++) { |
| 406 | int len = atomicio(read, connection_in, &buf[i], 1); |
| 407 | if (len < 0) |
| 408 | fatal("ssh_exchange_identification: read: %.100s", strerror(errno)); |
| 409 | if (len != 1) |
| 410 | fatal("ssh_exchange_identification: Connection closed by remote host"); |
| 411 | if (buf[i] == '\r') { |
| 412 | buf[i] = '\n'; |
| 413 | buf[i + 1] = 0; |
| 414 | continue; /**XXX wait for \n */ |
| 415 | } |
| 416 | if (buf[i] == '\n') { |
| 417 | buf[i + 1] = 0; |
| 418 | break; |
| 419 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 420 | } |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 421 | buf[sizeof(buf) - 1] = 0; |
| 422 | if (strncmp(buf, "SSH-", 4) == 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 423 | break; |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 424 | debug("ssh_exchange_identification: %s", buf); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 425 | } |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 426 | server_version_string = xstrdup(buf); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 427 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 428 | /* |
| 429 | * Check that the versions match. In future this might accept |
| 430 | * several versions and set appropriate flags to handle them. |
| 431 | */ |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 432 | if (sscanf(server_version_string, "SSH-%d.%d-%[^\n]\n", |
| 433 | &remote_major, &remote_minor, remote_version) != 3) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 434 | fatal("Bad remote protocol version identification: '%.100s'", buf); |
| 435 | debug("Remote protocol version %d.%d, remote software version %.100s", |
| 436 | remote_major, remote_minor, remote_version); |
| 437 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 438 | compat_datafellows(remote_version); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 439 | mismatch = 0; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 440 | |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 441 | switch(remote_major) { |
| 442 | case 1: |
| 443 | if (remote_minor == 99 && |
| 444 | (options.protocol & SSH_PROTO_2) && |
| 445 | !(options.protocol & SSH_PROTO_1_PREFERRED)) { |
| 446 | enable_compat20(); |
| 447 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 448 | } |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 449 | if (!(options.protocol & SSH_PROTO_1)) { |
| 450 | mismatch = 1; |
| 451 | break; |
| 452 | } |
| 453 | if (remote_minor < 3) { |
| 454 | fatal("Remote machine has too old SSH software version."); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 455 | } else if (remote_minor == 3 || remote_minor == 4) { |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 456 | /* We speak 1.3, too. */ |
| 457 | enable_compat13(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 458 | minor1 = 3; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 459 | if (options.forward_agent) { |
| 460 | log("Agent forwarding disabled for protocol 1.3"); |
| 461 | options.forward_agent = 0; |
| 462 | } |
| 463 | } |
| 464 | break; |
| 465 | case 2: |
| 466 | if (options.protocol & SSH_PROTO_2) { |
| 467 | enable_compat20(); |
| 468 | break; |
| 469 | } |
| 470 | /* FALLTHROUGH */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 471 | default: |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 472 | mismatch = 1; |
| 473 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 474 | } |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 475 | if (mismatch) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 476 | fatal("Protocol major versions differ: %d vs. %d", |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 477 | (options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
| 478 | remote_major); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 479 | /* Send our own protocol version identification. */ |
| 480 | snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 481 | compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 482 | compat20 ? PROTOCOL_MINOR_2 : minor1, |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 483 | SSH_VERSION); |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 484 | if (atomicio(write, connection_out, buf, strlen(buf)) != strlen(buf)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 485 | fatal("write: %.100s", strerror(errno)); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 486 | client_version_string = xstrdup(buf); |
| 487 | chop(client_version_string); |
| 488 | chop(server_version_string); |
| 489 | debug("Local version string %.100s", client_version_string); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 490 | } |
| 491 | |
Ben Lindstrom | b6c06d9 | 2001-02-10 23:21:09 +0000 | [diff] [blame] | 492 | /* defaults to 'no' */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 493 | static int |
Damien Miller | e398004 | 2001-10-10 15:02:03 +1000 | [diff] [blame] | 494 | confirm(const char *prompt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 495 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 496 | char buf[1024]; |
| 497 | FILE *f; |
| 498 | int retval = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 499 | |
Ben Lindstrom | b6c06d9 | 2001-02-10 23:21:09 +0000 | [diff] [blame] | 500 | if (options.batch_mode) |
| 501 | return 0; |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 502 | if (isatty(STDIN_FILENO)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 503 | f = stdin; |
| 504 | else |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 505 | f = fopen(_PATH_TTY, "rw"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 506 | if (f == NULL) |
| 507 | return 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 508 | fflush(stdout); |
Damien Miller | 59d9fb9 | 2001-10-10 15:03:11 +1000 | [diff] [blame^] | 509 | fprintf(stderr, "%s", prompt); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 510 | while (1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 511 | if (fgets(buf, sizeof(buf), f) == NULL) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 512 | fprintf(stderr, "\n"); |
| 513 | strlcpy(buf, "no", sizeof buf); |
| 514 | } |
| 515 | /* Remove newline from response. */ |
| 516 | if (strchr(buf, '\n')) |
| 517 | *strchr(buf, '\n') = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 518 | if (strcmp(buf, "yes") == 0) |
| 519 | retval = 1; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 520 | else if (strcmp(buf, "no") == 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 521 | retval = 0; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 522 | else |
Damien Miller | 59d9fb9 | 2001-10-10 15:03:11 +1000 | [diff] [blame^] | 523 | fprintf(stderr, "Please type 'yes' or 'no': "); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 524 | |
| 525 | if (retval != -1) { |
| 526 | if (f != stdin) |
| 527 | fclose(f); |
| 528 | return retval; |
| 529 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 530 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 531 | } |
| 532 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 533 | /* |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 534 | * check whether the supplied host key is valid, return -1 if the key |
| 535 | * is not valid. the user_hostfile will not be updated if 'readonly' is true. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 536 | */ |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 537 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 538 | static int |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 539 | check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key, |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 540 | int readonly, const char *user_hostfile, const char *system_hostfile) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 541 | { |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 542 | Key *file_key; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 543 | char *type = key_type(host_key); |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 544 | char *ip = NULL; |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 545 | char hostline[1000], *hostp, *fp; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 546 | HostStatus host_status; |
| 547 | HostStatus ip_status; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 548 | int local = 0, host_ip_differ = 0; |
Damien Miller | eaf9994 | 2000-01-19 13:45:07 +1100 | [diff] [blame] | 549 | int salen; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 550 | char ntop[NI_MAXHOST]; |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 551 | int host_line, ip_line; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 552 | const char *host_file = NULL, *ip_file = NULL; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 553 | |
| 554 | /* |
| 555 | * Force accepting of the host key for loopback/localhost. The |
| 556 | * problem is that if the home directory is NFS-mounted to multiple |
| 557 | * machines, localhost will refer to a different machine in each of |
| 558 | * them, and the user will get bogus HOST_CHANGED warnings. This |
| 559 | * essentially disables host authentication for localhost; however, |
| 560 | * this is probably not a real problem. |
| 561 | */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 562 | /** hostaddr == 0! */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 563 | switch (hostaddr->sa_family) { |
| 564 | case AF_INET: |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 565 | local = (ntohl(((struct sockaddr_in *)hostaddr)-> |
| 566 | sin_addr.s_addr) >> 24) == IN_LOOPBACKNET; |
Damien Miller | eaf9994 | 2000-01-19 13:45:07 +1100 | [diff] [blame] | 567 | salen = sizeof(struct sockaddr_in); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 568 | break; |
| 569 | case AF_INET6: |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 570 | local = IN6_IS_ADDR_LOOPBACK( |
| 571 | &(((struct sockaddr_in6 *)hostaddr)->sin6_addr)); |
Damien Miller | eaf9994 | 2000-01-19 13:45:07 +1100 | [diff] [blame] | 572 | salen = sizeof(struct sockaddr_in6); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 573 | break; |
| 574 | default: |
| 575 | local = 0; |
Damien Miller | eaf9994 | 2000-01-19 13:45:07 +1100 | [diff] [blame] | 576 | salen = sizeof(struct sockaddr_storage); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 577 | break; |
| 578 | } |
Ben Lindstrom | 3cecc9a | 2001-10-03 17:39:38 +0000 | [diff] [blame] | 579 | if (options.no_host_authentication_for_localhost == 1 && local && |
| 580 | options.host_key_alias == NULL) { |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 581 | debug("Forcing accepting of host key for " |
| 582 | "loopback/localhost."); |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 583 | return 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 584 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 585 | |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 586 | /* |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 587 | * We don't have the remote ip-address for connections |
| 588 | * using a proxy command |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 589 | */ |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 590 | if (options.proxy_command == NULL) { |
| 591 | if (getnameinfo(hostaddr, salen, ntop, sizeof(ntop), |
| 592 | NULL, 0, NI_NUMERICHOST) != 0) |
| 593 | fatal("check_host_key: getnameinfo failed"); |
| 594 | ip = xstrdup(ntop); |
| 595 | } else { |
| 596 | ip = xstrdup("<no hostip for proxy command>"); |
| 597 | } |
| 598 | /* |
| 599 | * Turn off check_host_ip if the connection is to localhost, via proxy |
| 600 | * command or if we don't have a hostname to compare with |
| 601 | */ |
| 602 | if (options.check_host_ip && |
| 603 | (local || strcmp(host, ip) == 0 || options.proxy_command != NULL)) |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 604 | options.check_host_ip = 0; |
| 605 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 606 | /* |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 607 | * Allow the user to record the key under a different name. This is |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 608 | * useful for ssh tunneling over forwarded connections or if you run |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 609 | * multiple sshd's on different ports on the same machine. |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 610 | */ |
| 611 | if (options.host_key_alias != NULL) { |
| 612 | host = options.host_key_alias; |
| 613 | debug("using hostkeyalias: %s", host); |
| 614 | } |
| 615 | |
| 616 | /* |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 617 | * Store the host key from the known host file in here so that we can |
| 618 | * compare it with the key for the IP address. |
| 619 | */ |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 620 | file_key = key_new(host_key->type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 621 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 622 | /* |
| 623 | * Check if the host key is present in the user\'s list of known |
| 624 | * hosts or in the systemwide list. |
| 625 | */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 626 | host_file = user_hostfile; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 627 | host_status = check_host_in_hostfile(host_file, host, host_key, |
| 628 | file_key, &host_line); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 629 | if (host_status == HOST_NEW) { |
| 630 | host_file = system_hostfile; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 631 | host_status = check_host_in_hostfile(host_file, host, host_key, |
| 632 | file_key, &host_line); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 633 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 634 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 635 | * Also perform check for the ip address, skip the check if we are |
| 636 | * localhost or the hostname was an ip address to begin with |
| 637 | */ |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 638 | if (options.check_host_ip) { |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 639 | Key *ip_key = key_new(host_key->type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 640 | |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 641 | ip_file = user_hostfile; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 642 | ip_status = check_host_in_hostfile(ip_file, ip, host_key, |
| 643 | ip_key, &ip_line); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 644 | if (ip_status == HOST_NEW) { |
| 645 | ip_file = system_hostfile; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 646 | ip_status = check_host_in_hostfile(ip_file, ip, |
| 647 | host_key, ip_key, &ip_line); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 648 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 649 | if (host_status == HOST_CHANGED && |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 650 | (ip_status != HOST_CHANGED || !key_equal(ip_key, file_key))) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 651 | host_ip_differ = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 652 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 653 | key_free(ip_key); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 654 | } else |
| 655 | ip_status = host_status; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 656 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 657 | key_free(file_key); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 658 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 659 | switch (host_status) { |
| 660 | case HOST_OK: |
| 661 | /* The host is known and the key matches. */ |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 662 | debug("Host '%.200s' is known and matches the %s host key.", |
| 663 | host, type); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 664 | debug("Found key in %s:%d", host_file, host_line); |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 665 | if (options.check_host_ip && ip_status == HOST_NEW) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 666 | if (readonly) |
| 667 | log("%s host key for IP address " |
| 668 | "'%.128s' not in list of known hosts.", |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 669 | type, ip); |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 670 | else if (!add_host_to_hostfile(user_hostfile, ip, |
| 671 | host_key)) |
| 672 | log("Failed to add the %s host key for IP " |
| 673 | "address '%.128s' to the list of known " |
| 674 | "hosts (%.30s).", type, ip, user_hostfile); |
| 675 | else |
| 676 | log("Warning: Permanently added the %s host " |
| 677 | "key for IP address '%.128s' to the list " |
| 678 | "of known hosts.", type, ip); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 679 | } |
| 680 | break; |
| 681 | case HOST_NEW: |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 682 | if (readonly) |
| 683 | goto fail; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 684 | /* The host is new. */ |
| 685 | if (options.strict_host_key_checking == 1) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 686 | /* |
| 687 | * User has requested strict host key checking. We |
| 688 | * will not add the host key automatically. The only |
| 689 | * alternative left is to abort. |
| 690 | */ |
| 691 | error("No %s host key is known for %.200s and you " |
| 692 | "have requested strict checking.", type, host); |
| 693 | goto fail; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 694 | } else if (options.strict_host_key_checking == 2) { |
| 695 | /* The default */ |
| 696 | char prompt[1024]; |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 697 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 698 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 699 | "The authenticity of host '%.200s (%s)' can't be " |
| 700 | "established.\n" |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 701 | "%s key fingerprint is %s.\n" |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 702 | "Are you sure you want to continue connecting " |
| 703 | "(yes/no)? ", host, ip, type, fp); |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 704 | xfree(fp); |
Damien Miller | e398004 | 2001-10-10 15:02:03 +1000 | [diff] [blame] | 705 | if (!confirm(prompt)) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 706 | goto fail; |
| 707 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 708 | } |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 709 | if (options.check_host_ip && ip_status == HOST_NEW) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 710 | snprintf(hostline, sizeof(hostline), "%s,%s", host, ip); |
| 711 | hostp = hostline; |
| 712 | } else |
| 713 | hostp = host; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 714 | |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 715 | /* |
| 716 | * If not in strict mode, add the key automatically to the |
| 717 | * local known_hosts file. |
| 718 | */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 719 | if (!add_host_to_hostfile(user_hostfile, hostp, host_key)) |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 720 | log("Failed to add the host to the list of known " |
| 721 | "hosts (%.500s).", user_hostfile); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 722 | else |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 723 | log("Warning: Permanently added '%.200s' (%s) to the " |
| 724 | "list of known hosts.", hostp, type); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 725 | break; |
| 726 | case HOST_CHANGED: |
| 727 | if (options.check_host_ip && host_ip_differ) { |
| 728 | char *msg; |
| 729 | if (ip_status == HOST_NEW) |
| 730 | msg = "is unknown"; |
| 731 | else if (ip_status == HOST_OK) |
| 732 | msg = "is unchanged"; |
| 733 | else |
| 734 | msg = "has a different value"; |
| 735 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 736 | error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @"); |
| 737 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 738 | error("The %s host key for %s has changed,", type, host); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 739 | error("and the key for the according IP address %s", ip); |
| 740 | error("%s. This could either mean that", msg); |
| 741 | error("DNS SPOOFING is happening or the IP address for the host"); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 742 | error("and its host key have changed at the same time."); |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 743 | if (ip_status != HOST_NEW) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 744 | error("Offending key for IP in %s:%d", ip_file, ip_line); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 745 | } |
| 746 | /* The host key has changed. */ |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 747 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 748 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
Damien Miller | f039bad | 1999-12-21 20:57:20 +1100 | [diff] [blame] | 749 | error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 750 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 751 | error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!"); |
| 752 | error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!"); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 753 | error("It is also possible that the %s host key has just been changed.", type); |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 754 | error("The fingerprint for the %s key sent by the remote host is\n%s.", |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 755 | type, fp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 756 | error("Please contact your system administrator."); |
| 757 | error("Add correct host key in %.100s to get rid of this message.", |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 758 | user_hostfile); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 759 | error("Offending key in %s:%d", host_file, host_line); |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 760 | xfree(fp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 761 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 762 | /* |
| 763 | * If strict host key checking is in use, the user will have |
| 764 | * to edit the key manually and we can only abort. |
| 765 | */ |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 766 | if (options.strict_host_key_checking) { |
| 767 | error("%s host key for %.200s has changed and you have " |
| 768 | "requested strict checking.", type, host); |
| 769 | goto fail; |
| 770 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 771 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 772 | /* |
| 773 | * If strict host key checking has not been requested, allow |
| 774 | * the connection but without password authentication or |
| 775 | * agent forwarding. |
| 776 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 777 | if (options.password_authentication) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 778 | error("Password authentication is disabled to avoid " |
| 779 | "man-in-the-middle attacks."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 780 | options.password_authentication = 0; |
| 781 | } |
| 782 | if (options.forward_agent) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 783 | error("Agent forwarding is disabled to avoid " |
| 784 | "man-in-the-middle attacks."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 785 | options.forward_agent = 0; |
| 786 | } |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 787 | if (options.forward_x11) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 788 | error("X11 forwarding is disabled to avoid " |
| 789 | "man-in-the-middle attacks."); |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 790 | options.forward_x11 = 0; |
| 791 | } |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 792 | if (options.num_local_forwards > 0 || |
| 793 | options.num_remote_forwards > 0) { |
| 794 | error("Port forwarding is disabled to avoid " |
| 795 | "man-in-the-middle attacks."); |
| 796 | options.num_local_forwards = |
| 797 | options.num_remote_forwards = 0; |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 798 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 799 | /* |
| 800 | * XXX Should permit the user to change to use the new id. |
| 801 | * This could be done by converting the host key to an |
| 802 | * identifying sentence, tell that the host identifies itself |
| 803 | * by that sentence, and ask the user if he/she whishes to |
| 804 | * accept the authentication. |
| 805 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 806 | break; |
| 807 | } |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 808 | |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 809 | if (options.check_host_ip && host_status != HOST_CHANGED && |
| 810 | ip_status == HOST_CHANGED) { |
| 811 | log("Warning: the %s host key for '%.200s' " |
Kevin Steves | 4327686 | 2001-02-11 13:56:43 +0000 | [diff] [blame] | 812 | "differs from the key for the IP address '%.128s'", |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 813 | type, host, ip); |
| 814 | if (host_status == HOST_OK) |
| 815 | log("Matching host key in %s:%d", host_file, host_line); |
| 816 | log("Offending key for IP in %s:%d", ip_file, ip_line); |
| 817 | if (options.strict_host_key_checking == 1) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 818 | error("Exiting, you have requested strict checking."); |
| 819 | goto fail; |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 820 | } else if (options.strict_host_key_checking == 2) { |
Damien Miller | e398004 | 2001-10-10 15:02:03 +1000 | [diff] [blame] | 821 | if (!confirm("Are you sure you want " |
| 822 | "to continue connecting (yes/no)? ")) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 823 | goto fail; |
| 824 | } |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 825 | } |
| 826 | } |
| 827 | |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 828 | xfree(ip); |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 829 | return 0; |
| 830 | |
| 831 | fail: |
| 832 | xfree(ip); |
| 833 | return -1; |
| 834 | } |
| 835 | |
| 836 | int |
| 837 | verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key) |
| 838 | { |
| 839 | struct stat st; |
| 840 | |
| 841 | /* return ok if the key can be found in an old keyfile */ |
| 842 | if (stat(options.system_hostfile2, &st) == 0 || |
| 843 | stat(options.user_hostfile2, &st) == 0) { |
| 844 | if (check_host_key(host, hostaddr, host_key, /*readonly*/ 1, |
| 845 | options.user_hostfile2, options.system_hostfile2) == 0) |
| 846 | return 0; |
| 847 | } |
| 848 | return check_host_key(host, hostaddr, host_key, /*readonly*/ 0, |
| 849 | options.user_hostfile, options.system_hostfile); |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 850 | } |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 851 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 852 | /* |
| 853 | * Starts a dialog with the server, and authenticates the current user on the |
| 854 | * server. This does not need any extra privileges. The basic connection |
| 855 | * to the server must already have been established before this is called. |
| 856 | * If login fails, this function prints an error and never returns. |
| 857 | * This function does not require super-user privileges. |
| 858 | */ |
| 859 | void |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 860 | ssh_login(Key **keys, int nkeys, const char *orighost, |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 861 | struct sockaddr *hostaddr, struct passwd *pw) |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 862 | { |
| 863 | char *host, *cp; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 864 | char *server_user, *local_user; |
| 865 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 866 | local_user = xstrdup(pw->pw_name); |
| 867 | server_user = options.user ? options.user : local_user; |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 868 | |
| 869 | /* Convert the user-supplied hostname into all lowercase. */ |
| 870 | host = xstrdup(orighost); |
| 871 | for (cp = host; *cp; cp++) |
| 872 | if (isupper(*cp)) |
| 873 | *cp = tolower(*cp); |
| 874 | |
| 875 | /* Exchange protocol version identification strings with the server. */ |
| 876 | ssh_exchange_identification(); |
| 877 | |
| 878 | /* Put the connection into non-blocking mode. */ |
| 879 | packet_set_nonblocking(); |
| 880 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 881 | /* key exchange */ |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 882 | /* authenticate user */ |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 883 | if (compat20) { |
| 884 | ssh_kex2(host, hostaddr); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 885 | ssh_userauth2(local_user, server_user, host, keys, nkeys); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 886 | } else { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 887 | ssh_kex(host, hostaddr); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 888 | ssh_userauth1(local_user, server_user, host, keys, nkeys); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 889 | } |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 890 | } |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 891 | |
| 892 | void |
| 893 | ssh_put_password(char *password) |
| 894 | { |
| 895 | int size; |
| 896 | char *padded; |
| 897 | |
Ben Lindstrom | d20d0f3 | 2001-03-10 17:22:20 +0000 | [diff] [blame] | 898 | if (datafellows & SSH_BUG_PASSWORDPAD) { |
Ben Lindstrom | 664408d | 2001-06-09 01:42:01 +0000 | [diff] [blame] | 899 | packet_put_cstring(password); |
Ben Lindstrom | d20d0f3 | 2001-03-10 17:22:20 +0000 | [diff] [blame] | 900 | return; |
| 901 | } |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 902 | size = roundup(strlen(password) + 1, 32); |
| 903 | padded = xmalloc(size); |
| 904 | memset(padded, 0, size); |
| 905 | strlcpy(padded, password, size); |
| 906 | packet_put_string(padded, size); |
| 907 | memset(padded, 0, size); |
| 908 | xfree(padded); |
| 909 | } |