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" |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 16 | RCSID("$OpenBSD: sshconnect.c,v 1.110 2001/07/25 14:35:18 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 | |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 44 | static const char * |
| 45 | sockaddr_ntop(struct sockaddr *sa) |
| 46 | { |
| 47 | void *addr; |
| 48 | static char addrbuf[INET6_ADDRSTRLEN]; |
| 49 | |
| 50 | switch (sa->sa_family) { |
| 51 | case AF_INET: |
| 52 | addr = &((struct sockaddr_in *)sa)->sin_addr; |
| 53 | break; |
| 54 | case AF_INET6: |
| 55 | addr = &((struct sockaddr_in6 *)sa)->sin6_addr; |
| 56 | break; |
| 57 | default: |
| 58 | /* This case should be protected against elsewhere */ |
| 59 | abort(); |
| 60 | } |
| 61 | inet_ntop(sa->sa_family, addr, addrbuf, sizeof(addrbuf)); |
| 62 | return addrbuf; |
| 63 | } |
| 64 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 65 | /* |
| 66 | * Connect to the given ssh server using a proxy command. |
| 67 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 68 | static int |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 69 | ssh_proxy_connect(const char *host, u_short port, struct passwd *pw, |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 70 | const char *proxy_command) |
| 71 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 72 | Buffer command; |
| 73 | const char *cp; |
| 74 | char *command_string; |
| 75 | int pin[2], pout[2]; |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 76 | pid_t pid; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 77 | char strport[NI_MAXSERV]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 78 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 79 | /* Convert the port number into a string. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 80 | snprintf(strport, sizeof strport, "%hu", port); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 81 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 82 | /* Build the final command string in the buffer by making the |
| 83 | appropriate substitutions to the given proxy command. */ |
| 84 | buffer_init(&command); |
| 85 | for (cp = proxy_command; *cp; cp++) { |
| 86 | if (cp[0] == '%' && cp[1] == '%') { |
| 87 | buffer_append(&command, "%", 1); |
| 88 | cp++; |
| 89 | continue; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 90 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 91 | if (cp[0] == '%' && cp[1] == 'h') { |
| 92 | buffer_append(&command, host, strlen(host)); |
| 93 | cp++; |
| 94 | continue; |
| 95 | } |
| 96 | if (cp[0] == '%' && cp[1] == 'p') { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 97 | buffer_append(&command, strport, strlen(strport)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 98 | cp++; |
| 99 | continue; |
| 100 | } |
| 101 | buffer_append(&command, cp, 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 102 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 103 | buffer_append(&command, "\0", 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 104 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 105 | /* Get the final command string. */ |
| 106 | command_string = buffer_ptr(&command); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 107 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 108 | /* Create pipes for communicating with the proxy. */ |
| 109 | if (pipe(pin) < 0 || pipe(pout) < 0) |
| 110 | fatal("Could not create pipes to communicate with the proxy: %.100s", |
| 111 | strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 112 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 113 | debug("Executing proxy command: %.500s", command_string); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 114 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 115 | /* Fork and execute the proxy command. */ |
| 116 | if ((pid = fork()) == 0) { |
| 117 | char *argv[10]; |
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 | /* Child. Permanently give up superuser privileges. */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 120 | permanently_set_uid(pw); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 121 | |
| 122 | /* Redirect stdin and stdout. */ |
| 123 | close(pin[1]); |
| 124 | if (pin[0] != 0) { |
| 125 | if (dup2(pin[0], 0) < 0) |
| 126 | perror("dup2 stdin"); |
| 127 | close(pin[0]); |
| 128 | } |
| 129 | close(pout[0]); |
| 130 | if (dup2(pout[1], 1) < 0) |
| 131 | perror("dup2 stdout"); |
| 132 | /* Cannot be 1 because pin allocated two descriptors. */ |
| 133 | close(pout[1]); |
| 134 | |
| 135 | /* Stderr is left as it is so that error messages get |
| 136 | printed on the user's terminal. */ |
Damien Miller | 7b413d2 | 2000-07-01 13:24:21 +1000 | [diff] [blame] | 137 | argv[0] = _PATH_BSHELL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 138 | argv[1] = "-c"; |
| 139 | argv[2] = command_string; |
| 140 | argv[3] = NULL; |
| 141 | |
| 142 | /* Execute the proxy command. Note that we gave up any |
| 143 | extra privileges above. */ |
Kevin Steves | fcd5d60 | 2001-01-07 11:45:22 +0000 | [diff] [blame] | 144 | execv(argv[0], argv); |
| 145 | perror(argv[0]); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 146 | exit(1); |
| 147 | } |
| 148 | /* Parent. */ |
| 149 | if (pid < 0) |
| 150 | fatal("fork failed: %.100s", strerror(errno)); |
| 151 | |
| 152 | /* Close child side of the descriptors. */ |
| 153 | close(pin[0]); |
| 154 | close(pout[1]); |
| 155 | |
| 156 | /* Free the command name. */ |
| 157 | buffer_free(&command); |
| 158 | |
| 159 | /* Set the connection file descriptors. */ |
| 160 | packet_set_connection(pout[0], pin[1]); |
| 161 | |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 162 | /* Indicate OK return */ |
| 163 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 164 | } |
| 165 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 166 | /* |
| 167 | * Creates a (possibly privileged) socket for use as the ssh connection. |
| 168 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 169 | static int |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 170 | ssh_create_socket(struct passwd *pw, int privileged, int family) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 171 | { |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 172 | int sock, gaierr; |
| 173 | struct addrinfo hints, *res; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 174 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 175 | /* |
| 176 | * If we are running as root and want to connect to a privileged |
| 177 | * port, bind our own socket to a privileged port. |
| 178 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 179 | if (privileged) { |
| 180 | int p = IPPORT_RESERVED - 1; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 181 | sock = rresvport_af(&p, family); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 182 | if (sock < 0) |
Damien Miller | 98c7ad6 | 2000-03-09 21:27:49 +1100 | [diff] [blame] | 183 | error("rresvport: af=%d %.100s", family, strerror(errno)); |
| 184 | else |
| 185 | debug("Allocated local port %d.", p); |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 186 | return sock; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 187 | } |
Ben Lindstrom | e0f8804 | 2001-04-30 13:06:24 +0000 | [diff] [blame] | 188 | /* |
| 189 | * Just create an ordinary socket on arbitrary port. We use |
| 190 | * the user's uid to create the socket. |
| 191 | */ |
| 192 | temporarily_use_uid(pw); |
| 193 | sock = socket(family, SOCK_STREAM, 0); |
| 194 | if (sock < 0) |
| 195 | error("socket: %.100s", strerror(errno)); |
| 196 | restore_uid(); |
| 197 | |
| 198 | /* Bind the socket to an alternative local IP address */ |
| 199 | if (options.bind_address == NULL) |
| 200 | return sock; |
| 201 | |
| 202 | memset(&hints, 0, sizeof(hints)); |
| 203 | hints.ai_family = IPv4or6; |
| 204 | hints.ai_socktype = SOCK_STREAM; |
| 205 | hints.ai_flags = AI_PASSIVE; |
| 206 | gaierr = getaddrinfo(options.bind_address, "0", &hints, &res); |
| 207 | if (gaierr) { |
| 208 | error("getaddrinfo: %s: %s", options.bind_address, |
| 209 | gai_strerror(gaierr)); |
| 210 | close(sock); |
| 211 | return -1; |
| 212 | } |
| 213 | if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) { |
| 214 | error("bind: %s: %s", options.bind_address, strerror(errno)); |
| 215 | close(sock); |
| 216 | freeaddrinfo(res); |
| 217 | return -1; |
| 218 | } |
| 219 | freeaddrinfo(res); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 220 | return sock; |
| 221 | } |
| 222 | |
| 223 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 224 | * Opens a TCP/IP connection to the remote server on the given host. |
| 225 | * The address of the remote host will be returned in hostaddr. |
| 226 | * 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] | 227 | * a privileged port will be allocated to make the connection. |
| 228 | * This requires super-user privileges if anonymous is false. |
| 229 | * Connection_attempts specifies the maximum number of tries (one per |
| 230 | * second). If proxy_command is non-NULL, it specifies the command (with %h |
| 231 | * and %p substituted for host and port, respectively) to use to contact |
| 232 | * the daemon. |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 233 | * Return values: |
| 234 | * 0 for OK |
| 235 | * ECONNREFUSED if we got a "Connection Refused" by the peer on any address |
| 236 | * ECONNABORTED if we failed without a "Connection refused" |
| 237 | * Suitable error messages for the connection failure will already have been |
| 238 | * printed. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 239 | */ |
| 240 | int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 241 | ssh_connect(const char *host, struct sockaddr_storage * hostaddr, |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 242 | u_short port, int connection_attempts, |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 243 | int anonymous, struct passwd *pw, |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 244 | const char *proxy_command) |
| 245 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 246 | int gaierr; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 247 | int on = 1; |
| 248 | int sock = -1, attempt; |
| 249 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| 250 | struct addrinfo hints, *ai, *aitop; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 251 | struct linger linger; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 252 | struct servent *sp; |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 253 | /* |
| 254 | * Did we get only other errors than "Connection refused" (which |
| 255 | * should block fallback to rsh and similar), or did we get at least |
| 256 | * one "Connection refused"? |
| 257 | */ |
| 258 | int full_failure = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 259 | |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 260 | debug("ssh_connect: getuid %u geteuid %u anon %d", |
| 261 | (u_int) getuid(), (u_int) geteuid(), anonymous); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 262 | |
| 263 | /* Get default port if port has not been set. */ |
| 264 | if (port == 0) { |
| 265 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); |
| 266 | if (sp) |
| 267 | port = ntohs(sp->s_port); |
| 268 | else |
| 269 | port = SSH_DEFAULT_PORT; |
| 270 | } |
| 271 | /* If a proxy command is given, connect using it. */ |
| 272 | if (proxy_command != NULL) |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 273 | return ssh_proxy_connect(host, port, pw, proxy_command); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 274 | |
| 275 | /* No proxy command. */ |
| 276 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 277 | memset(&hints, 0, sizeof(hints)); |
| 278 | hints.ai_family = IPv4or6; |
| 279 | hints.ai_socktype = SOCK_STREAM; |
| 280 | snprintf(strport, sizeof strport, "%d", port); |
| 281 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) |
| 282 | fatal("%s: %.100s: %s", __progname, host, |
| 283 | gai_strerror(gaierr)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 284 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 285 | /* |
| 286 | * Try to connect several times. On some machines, the first time |
| 287 | * will sometimes fail. In general socket code appears to behave |
| 288 | * quite magically on many machines. |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 289 | */ |
| 290 | for (attempt = 0; ;) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 291 | if (attempt > 0) |
| 292 | debug("Trying again..."); |
| 293 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 294 | /* Loop through addresses for this host, and try each one in |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 295 | sequence until the connection succeeds. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 296 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 297 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 298 | continue; |
| 299 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, |
| 300 | ntop, sizeof(ntop), strport, sizeof(strport), |
| 301 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
| 302 | error("ssh_connect: getnameinfo failed"); |
| 303 | continue; |
| 304 | } |
| 305 | debug("Connecting to %.200s [%.100s] port %s.", |
| 306 | host, ntop, strport); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 307 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 308 | /* Create a socket for connecting. */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 309 | sock = ssh_create_socket(pw, |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 310 | #ifdef HAVE_CYGWIN |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 311 | !anonymous, |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 312 | #else |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 313 | !anonymous && geteuid() == 0, |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 314 | #endif |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 315 | ai->ai_family); |
| 316 | if (sock < 0) |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 317 | /* Any error is already output */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 318 | continue; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 319 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 320 | /* Connect to the host. We use the user's uid in the |
| 321 | * hope that it will help with tcp_wrappers showing |
| 322 | * the remote uid as root. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 323 | */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 324 | temporarily_use_uid(pw); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 325 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) >= 0) { |
| 326 | /* Successful connection. */ |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 327 | memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 328 | restore_uid(); |
| 329 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 330 | } else { |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 331 | if (errno == ECONNREFUSED) |
| 332 | full_failure = 0; |
| 333 | log("ssh: connect to address %s port %s: %s", |
| 334 | sockaddr_ntop(ai->ai_addr), strport, |
| 335 | strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 336 | restore_uid(); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 337 | /* |
| 338 | * Close the failed socket; there appear to |
| 339 | * be some problems when reusing a socket for |
| 340 | * which connect() has already returned an |
| 341 | * error. |
| 342 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 343 | shutdown(sock, SHUT_RDWR); |
| 344 | close(sock); |
| 345 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 346 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 347 | if (ai) |
| 348 | break; /* Successful connection. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 349 | |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 350 | attempt++; |
| 351 | if (attempt >= connection_attempts) |
| 352 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 353 | /* Sleep a moment before retrying. */ |
| 354 | sleep(1); |
| 355 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 356 | |
| 357 | freeaddrinfo(aitop); |
| 358 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 359 | /* Return failure if we didn't get a successful connection. */ |
| 360 | if (attempt >= connection_attempts) |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 361 | return full_failure ? ECONNABORTED : ECONNREFUSED; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 362 | |
| 363 | debug("Connection established."); |
| 364 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 365 | /* |
| 366 | * Set socket options. We would like the socket to disappear as soon |
| 367 | * as it has been closed for whatever reason. |
| 368 | */ |
| 369 | /* setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 370 | linger.l_onoff = 1; |
| 371 | linger.l_linger = 5; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 372 | setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); |
| 373 | |
| 374 | /* Set keepalives if requested. */ |
| 375 | if (options.keepalives && |
| 376 | setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, |
| 377 | sizeof(on)) < 0) |
| 378 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 379 | |
| 380 | /* Set the connection. */ |
| 381 | packet_set_connection(sock, sock); |
| 382 | |
Ben Lindstrom | f9cedb9 | 2001-08-06 21:07:11 +0000 | [diff] [blame] | 383 | return 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 384 | } |
| 385 | |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 386 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 387 | * Waits for the server identification string, and sends our own |
| 388 | * identification string. |
| 389 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 390 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 391 | ssh_exchange_identification(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 392 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 393 | char buf[256], remote_version[256]; /* must be same size! */ |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 394 | int remote_major, remote_minor, i, mismatch; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 395 | int connection_in = packet_get_connection_in(); |
| 396 | int connection_out = packet_get_connection_out(); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 397 | int minor1 = PROTOCOL_MINOR_1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 398 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 399 | /* Read other side\'s version identification. */ |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 400 | for (;;) { |
| 401 | for (i = 0; i < sizeof(buf) - 1; i++) { |
| 402 | int len = atomicio(read, connection_in, &buf[i], 1); |
| 403 | if (len < 0) |
| 404 | fatal("ssh_exchange_identification: read: %.100s", strerror(errno)); |
| 405 | if (len != 1) |
| 406 | fatal("ssh_exchange_identification: Connection closed by remote host"); |
| 407 | if (buf[i] == '\r') { |
| 408 | buf[i] = '\n'; |
| 409 | buf[i + 1] = 0; |
| 410 | continue; /**XXX wait for \n */ |
| 411 | } |
| 412 | if (buf[i] == '\n') { |
| 413 | buf[i + 1] = 0; |
| 414 | break; |
| 415 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 416 | } |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 417 | buf[sizeof(buf) - 1] = 0; |
| 418 | if (strncmp(buf, "SSH-", 4) == 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 419 | break; |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 420 | debug("ssh_exchange_identification: %s", buf); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 421 | } |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 422 | server_version_string = xstrdup(buf); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 423 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 424 | /* |
| 425 | * Check that the versions match. In future this might accept |
| 426 | * several versions and set appropriate flags to handle them. |
| 427 | */ |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 428 | if (sscanf(server_version_string, "SSH-%d.%d-%[^\n]\n", |
| 429 | &remote_major, &remote_minor, remote_version) != 3) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 430 | fatal("Bad remote protocol version identification: '%.100s'", buf); |
| 431 | debug("Remote protocol version %d.%d, remote software version %.100s", |
| 432 | remote_major, remote_minor, remote_version); |
| 433 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 434 | compat_datafellows(remote_version); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 435 | mismatch = 0; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 436 | |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 437 | switch(remote_major) { |
| 438 | case 1: |
| 439 | if (remote_minor == 99 && |
| 440 | (options.protocol & SSH_PROTO_2) && |
| 441 | !(options.protocol & SSH_PROTO_1_PREFERRED)) { |
| 442 | enable_compat20(); |
| 443 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 444 | } |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 445 | if (!(options.protocol & SSH_PROTO_1)) { |
| 446 | mismatch = 1; |
| 447 | break; |
| 448 | } |
| 449 | if (remote_minor < 3) { |
| 450 | fatal("Remote machine has too old SSH software version."); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 451 | } else if (remote_minor == 3 || remote_minor == 4) { |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 452 | /* We speak 1.3, too. */ |
| 453 | enable_compat13(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 454 | minor1 = 3; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 455 | if (options.forward_agent) { |
| 456 | log("Agent forwarding disabled for protocol 1.3"); |
| 457 | options.forward_agent = 0; |
| 458 | } |
| 459 | } |
| 460 | break; |
| 461 | case 2: |
| 462 | if (options.protocol & SSH_PROTO_2) { |
| 463 | enable_compat20(); |
| 464 | break; |
| 465 | } |
| 466 | /* FALLTHROUGH */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 467 | default: |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 468 | mismatch = 1; |
| 469 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 470 | } |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 471 | if (mismatch) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 472 | fatal("Protocol major versions differ: %d vs. %d", |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 473 | (options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
| 474 | remote_major); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 475 | /* Send our own protocol version identification. */ |
| 476 | snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 477 | compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 478 | compat20 ? PROTOCOL_MINOR_2 : minor1, |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 479 | SSH_VERSION); |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 480 | if (atomicio(write, connection_out, buf, strlen(buf)) != strlen(buf)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 481 | fatal("write: %.100s", strerror(errno)); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 482 | client_version_string = xstrdup(buf); |
| 483 | chop(client_version_string); |
| 484 | chop(server_version_string); |
| 485 | debug("Local version string %.100s", client_version_string); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 486 | } |
| 487 | |
Ben Lindstrom | b6c06d9 | 2001-02-10 23:21:09 +0000 | [diff] [blame] | 488 | /* defaults to 'no' */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 489 | static int |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 490 | read_yes_or_no(const char *prompt, int defval) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 491 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 492 | char buf[1024]; |
| 493 | FILE *f; |
| 494 | int retval = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 495 | |
Ben Lindstrom | b6c06d9 | 2001-02-10 23:21:09 +0000 | [diff] [blame] | 496 | if (options.batch_mode) |
| 497 | return 0; |
| 498 | |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 499 | if (isatty(STDIN_FILENO)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 500 | f = stdin; |
| 501 | else |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 502 | f = fopen(_PATH_TTY, "rw"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 503 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 504 | if (f == NULL) |
| 505 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 506 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 507 | fflush(stdout); |
| 508 | |
| 509 | while (1) { |
| 510 | fprintf(stderr, "%s", prompt); |
| 511 | if (fgets(buf, sizeof(buf), f) == NULL) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 512 | /* |
| 513 | * Print a newline (the prompt probably didn\'t have |
| 514 | * one). |
| 515 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 516 | fprintf(stderr, "\n"); |
| 517 | strlcpy(buf, "no", sizeof buf); |
| 518 | } |
| 519 | /* Remove newline from response. */ |
| 520 | if (strchr(buf, '\n')) |
| 521 | *strchr(buf, '\n') = 0; |
| 522 | |
| 523 | if (buf[0] == 0) |
| 524 | retval = defval; |
| 525 | if (strcmp(buf, "yes") == 0) |
| 526 | retval = 1; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 527 | else if (strcmp(buf, "no") == 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 528 | retval = 0; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 529 | else |
| 530 | fprintf(stderr, "Please type 'yes' or 'no'.\n"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 531 | |
| 532 | if (retval != -1) { |
| 533 | if (f != stdin) |
| 534 | fclose(f); |
| 535 | return retval; |
| 536 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 537 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 538 | } |
| 539 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 540 | /* |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 541 | * check whether the supplied host key is valid, return -1 if the key |
| 542 | * 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] | 543 | */ |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 544 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 545 | static int |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 546 | check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key, |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 547 | int readonly, const char *user_hostfile, const char *system_hostfile) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 548 | { |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 549 | Key *file_key; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 550 | char *type = key_type(host_key); |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 551 | char *ip = NULL; |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 552 | char hostline[1000], *hostp, *fp; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 553 | HostStatus host_status; |
| 554 | HostStatus ip_status; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 555 | int local = 0, host_ip_differ = 0; |
Damien Miller | eaf9994 | 2000-01-19 13:45:07 +1100 | [diff] [blame] | 556 | int salen; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 557 | char ntop[NI_MAXHOST]; |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 558 | int host_line, ip_line; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 559 | const char *host_file = NULL, *ip_file = NULL; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 560 | |
| 561 | /* |
| 562 | * Force accepting of the host key for loopback/localhost. The |
| 563 | * problem is that if the home directory is NFS-mounted to multiple |
| 564 | * machines, localhost will refer to a different machine in each of |
| 565 | * them, and the user will get bogus HOST_CHANGED warnings. This |
| 566 | * essentially disables host authentication for localhost; however, |
| 567 | * this is probably not a real problem. |
| 568 | */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 569 | /** hostaddr == 0! */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 570 | switch (hostaddr->sa_family) { |
| 571 | case AF_INET: |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 572 | local = (ntohl(((struct sockaddr_in *)hostaddr)-> |
| 573 | sin_addr.s_addr) >> 24) == IN_LOOPBACKNET; |
Damien Miller | eaf9994 | 2000-01-19 13:45:07 +1100 | [diff] [blame] | 574 | salen = sizeof(struct sockaddr_in); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 575 | break; |
| 576 | case AF_INET6: |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 577 | local = IN6_IS_ADDR_LOOPBACK( |
| 578 | &(((struct sockaddr_in6 *)hostaddr)->sin6_addr)); |
Damien Miller | eaf9994 | 2000-01-19 13:45:07 +1100 | [diff] [blame] | 579 | salen = sizeof(struct sockaddr_in6); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 580 | break; |
| 581 | default: |
| 582 | local = 0; |
Damien Miller | eaf9994 | 2000-01-19 13:45:07 +1100 | [diff] [blame] | 583 | salen = sizeof(struct sockaddr_storage); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 584 | break; |
| 585 | } |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 586 | if (local && options.host_key_alias == NULL) { |
| 587 | debug("Forcing accepting of host key for " |
| 588 | "loopback/localhost."); |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 589 | return 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 590 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 591 | |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 592 | /* |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 593 | * We don't have the remote ip-address for connections |
| 594 | * using a proxy command |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 595 | */ |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 596 | if (options.proxy_command == NULL) { |
| 597 | if (getnameinfo(hostaddr, salen, ntop, sizeof(ntop), |
| 598 | NULL, 0, NI_NUMERICHOST) != 0) |
| 599 | fatal("check_host_key: getnameinfo failed"); |
| 600 | ip = xstrdup(ntop); |
| 601 | } else { |
| 602 | ip = xstrdup("<no hostip for proxy command>"); |
| 603 | } |
| 604 | /* |
| 605 | * Turn off check_host_ip if the connection is to localhost, via proxy |
| 606 | * command or if we don't have a hostname to compare with |
| 607 | */ |
| 608 | if (options.check_host_ip && |
| 609 | (local || strcmp(host, ip) == 0 || options.proxy_command != NULL)) |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 610 | options.check_host_ip = 0; |
| 611 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 612 | /* |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 613 | * 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] | 614 | * useful for ssh tunneling over forwarded connections or if you run |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 615 | * multiple sshd's on different ports on the same machine. |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 616 | */ |
| 617 | if (options.host_key_alias != NULL) { |
| 618 | host = options.host_key_alias; |
| 619 | debug("using hostkeyalias: %s", host); |
| 620 | } |
| 621 | |
| 622 | /* |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 623 | * Store the host key from the known host file in here so that we can |
| 624 | * compare it with the key for the IP address. |
| 625 | */ |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 626 | file_key = key_new(host_key->type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 627 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 628 | /* |
| 629 | * Check if the host key is present in the user\'s list of known |
| 630 | * hosts or in the systemwide list. |
| 631 | */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 632 | host_file = user_hostfile; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 633 | host_status = check_host_in_hostfile(host_file, host, host_key, |
| 634 | file_key, &host_line); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 635 | if (host_status == HOST_NEW) { |
| 636 | host_file = system_hostfile; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 637 | host_status = check_host_in_hostfile(host_file, host, host_key, |
| 638 | file_key, &host_line); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 639 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 640 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 641 | * Also perform check for the ip address, skip the check if we are |
| 642 | * localhost or the hostname was an ip address to begin with |
| 643 | */ |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 644 | if (options.check_host_ip) { |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 645 | Key *ip_key = key_new(host_key->type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 646 | |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 647 | ip_file = user_hostfile; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 648 | ip_status = check_host_in_hostfile(ip_file, ip, host_key, |
| 649 | ip_key, &ip_line); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 650 | if (ip_status == HOST_NEW) { |
| 651 | ip_file = system_hostfile; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 652 | ip_status = check_host_in_hostfile(ip_file, ip, |
| 653 | host_key, ip_key, &ip_line); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 654 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 655 | if (host_status == HOST_CHANGED && |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 656 | (ip_status != HOST_CHANGED || !key_equal(ip_key, file_key))) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 657 | host_ip_differ = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 658 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 659 | key_free(ip_key); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 660 | } else |
| 661 | ip_status = host_status; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 662 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 663 | key_free(file_key); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 664 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 665 | switch (host_status) { |
| 666 | case HOST_OK: |
| 667 | /* The host is known and the key matches. */ |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 668 | debug("Host '%.200s' is known and matches the %s host key.", |
| 669 | host, type); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 670 | debug("Found key in %s:%d", host_file, host_line); |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 671 | if (options.check_host_ip && ip_status == HOST_NEW) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 672 | if (readonly) |
| 673 | log("%s host key for IP address " |
| 674 | "'%.128s' not in list of known hosts.", |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 675 | type, ip); |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 676 | else if (!add_host_to_hostfile(user_hostfile, ip, |
| 677 | host_key)) |
| 678 | log("Failed to add the %s host key for IP " |
| 679 | "address '%.128s' to the list of known " |
| 680 | "hosts (%.30s).", type, ip, user_hostfile); |
| 681 | else |
| 682 | log("Warning: Permanently added the %s host " |
| 683 | "key for IP address '%.128s' to the list " |
| 684 | "of known hosts.", type, ip); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 685 | } |
| 686 | break; |
| 687 | case HOST_NEW: |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 688 | if (readonly) |
| 689 | goto fail; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 690 | /* The host is new. */ |
| 691 | if (options.strict_host_key_checking == 1) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 692 | /* |
| 693 | * User has requested strict host key checking. We |
| 694 | * will not add the host key automatically. The only |
| 695 | * alternative left is to abort. |
| 696 | */ |
| 697 | error("No %s host key is known for %.200s and you " |
| 698 | "have requested strict checking.", type, host); |
| 699 | goto fail; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 700 | } else if (options.strict_host_key_checking == 2) { |
| 701 | /* The default */ |
| 702 | char prompt[1024]; |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 703 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 704 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 705 | "The authenticity of host '%.200s (%s)' can't be " |
| 706 | "established.\n" |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 707 | "%s key fingerprint is %s.\n" |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 708 | "Are you sure you want to continue connecting " |
| 709 | "(yes/no)? ", host, ip, type, fp); |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 710 | xfree(fp); |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 711 | if (!read_yes_or_no(prompt, -1)) { |
| 712 | log("Aborted by user!"); |
| 713 | goto fail; |
| 714 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 715 | } |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 716 | if (options.check_host_ip && ip_status == HOST_NEW) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 717 | snprintf(hostline, sizeof(hostline), "%s,%s", host, ip); |
| 718 | hostp = hostline; |
| 719 | } else |
| 720 | hostp = host; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 721 | |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 722 | /* |
| 723 | * If not in strict mode, add the key automatically to the |
| 724 | * local known_hosts file. |
| 725 | */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 726 | if (!add_host_to_hostfile(user_hostfile, hostp, host_key)) |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 727 | log("Failed to add the host to the list of known " |
| 728 | "hosts (%.500s).", user_hostfile); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 729 | else |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 730 | log("Warning: Permanently added '%.200s' (%s) to the " |
| 731 | "list of known hosts.", hostp, type); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 732 | break; |
| 733 | case HOST_CHANGED: |
| 734 | if (options.check_host_ip && host_ip_differ) { |
| 735 | char *msg; |
| 736 | if (ip_status == HOST_NEW) |
| 737 | msg = "is unknown"; |
| 738 | else if (ip_status == HOST_OK) |
| 739 | msg = "is unchanged"; |
| 740 | else |
| 741 | msg = "has a different value"; |
| 742 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 743 | error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @"); |
| 744 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 745 | error("The %s host key for %s has changed,", type, host); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 746 | error("and the key for the according IP address %s", ip); |
| 747 | error("%s. This could either mean that", msg); |
| 748 | error("DNS SPOOFING is happening or the IP address for the host"); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 749 | error("and its host key have changed at the same time."); |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 750 | if (ip_status != HOST_NEW) |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 751 | error("Offending key for IP in %s:%d", ip_file, ip_line); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 752 | } |
| 753 | /* The host key has changed. */ |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 754 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 755 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
Damien Miller | f039bad | 1999-12-21 20:57:20 +1100 | [diff] [blame] | 756 | error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 757 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 758 | error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!"); |
| 759 | 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] | 760 | 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] | 761 | 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] | 762 | type, fp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 763 | error("Please contact your system administrator."); |
| 764 | 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] | 765 | user_hostfile); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 766 | error("Offending key in %s:%d", host_file, host_line); |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 767 | xfree(fp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 768 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 769 | /* |
| 770 | * If strict host key checking is in use, the user will have |
| 771 | * to edit the key manually and we can only abort. |
| 772 | */ |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 773 | if (options.strict_host_key_checking) { |
| 774 | error("%s host key for %.200s has changed and you have " |
| 775 | "requested strict checking.", type, host); |
| 776 | goto fail; |
| 777 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 778 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 779 | /* |
| 780 | * If strict host key checking has not been requested, allow |
| 781 | * the connection but without password authentication or |
| 782 | * agent forwarding. |
| 783 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 784 | if (options.password_authentication) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 785 | error("Password authentication is disabled to avoid " |
| 786 | "man-in-the-middle attacks."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 787 | options.password_authentication = 0; |
| 788 | } |
| 789 | if (options.forward_agent) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 790 | error("Agent forwarding is disabled to avoid " |
| 791 | "man-in-the-middle attacks."); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 792 | options.forward_agent = 0; |
| 793 | } |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 794 | if (options.forward_x11) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 795 | error("X11 forwarding is disabled to avoid " |
| 796 | "man-in-the-middle attacks."); |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 797 | options.forward_x11 = 0; |
| 798 | } |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 799 | if (options.num_local_forwards > 0 || |
| 800 | options.num_remote_forwards > 0) { |
| 801 | error("Port forwarding is disabled to avoid " |
| 802 | "man-in-the-middle attacks."); |
| 803 | options.num_local_forwards = |
| 804 | options.num_remote_forwards = 0; |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 805 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 806 | /* |
| 807 | * XXX Should permit the user to change to use the new id. |
| 808 | * This could be done by converting the host key to an |
| 809 | * identifying sentence, tell that the host identifies itself |
| 810 | * by that sentence, and ask the user if he/she whishes to |
| 811 | * accept the authentication. |
| 812 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 813 | break; |
| 814 | } |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 815 | |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 816 | if (options.check_host_ip && host_status != HOST_CHANGED && |
| 817 | ip_status == HOST_CHANGED) { |
| 818 | log("Warning: the %s host key for '%.200s' " |
Kevin Steves | 4327686 | 2001-02-11 13:56:43 +0000 | [diff] [blame] | 819 | "differs from the key for the IP address '%.128s'", |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 820 | type, host, ip); |
| 821 | if (host_status == HOST_OK) |
| 822 | log("Matching host key in %s:%d", host_file, host_line); |
| 823 | log("Offending key for IP in %s:%d", ip_file, ip_line); |
| 824 | if (options.strict_host_key_checking == 1) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 825 | error("Exiting, you have requested strict checking."); |
| 826 | goto fail; |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 827 | } else if (options.strict_host_key_checking == 2) { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 828 | if (!read_yes_or_no("Are you sure you want " |
| 829 | "to continue connecting (yes/no)? ", -1)) { |
| 830 | log("Aborted by user!"); |
| 831 | goto fail; |
| 832 | } |
Ben Lindstrom | 5c1fbab | 2001-01-03 03:51:15 +0000 | [diff] [blame] | 833 | } |
| 834 | } |
| 835 | |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 836 | xfree(ip); |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 837 | return 0; |
| 838 | |
| 839 | fail: |
| 840 | xfree(ip); |
| 841 | return -1; |
| 842 | } |
| 843 | |
| 844 | int |
| 845 | verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key) |
| 846 | { |
| 847 | struct stat st; |
| 848 | |
| 849 | /* return ok if the key can be found in an old keyfile */ |
| 850 | if (stat(options.system_hostfile2, &st) == 0 || |
| 851 | stat(options.user_hostfile2, &st) == 0) { |
| 852 | if (check_host_key(host, hostaddr, host_key, /*readonly*/ 1, |
| 853 | options.user_hostfile2, options.system_hostfile2) == 0) |
| 854 | return 0; |
| 855 | } |
| 856 | return check_host_key(host, hostaddr, host_key, /*readonly*/ 0, |
| 857 | options.user_hostfile, options.system_hostfile); |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 858 | } |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 859 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 860 | /* |
| 861 | * Starts a dialog with the server, and authenticates the current user on the |
| 862 | * server. This does not need any extra privileges. The basic connection |
| 863 | * to the server must already have been established before this is called. |
| 864 | * If login fails, this function prints an error and never returns. |
| 865 | * This function does not require super-user privileges. |
| 866 | */ |
| 867 | void |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 868 | ssh_login(Key **keys, int nkeys, const char *orighost, |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 869 | struct sockaddr *hostaddr, struct passwd *pw) |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 870 | { |
| 871 | char *host, *cp; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 872 | char *server_user, *local_user; |
| 873 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 874 | local_user = xstrdup(pw->pw_name); |
| 875 | server_user = options.user ? options.user : local_user; |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 876 | |
| 877 | /* Convert the user-supplied hostname into all lowercase. */ |
| 878 | host = xstrdup(orighost); |
| 879 | for (cp = host; *cp; cp++) |
| 880 | if (isupper(*cp)) |
| 881 | *cp = tolower(*cp); |
| 882 | |
| 883 | /* Exchange protocol version identification strings with the server. */ |
| 884 | ssh_exchange_identification(); |
| 885 | |
| 886 | /* Put the connection into non-blocking mode. */ |
| 887 | packet_set_nonblocking(); |
| 888 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 889 | /* key exchange */ |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 890 | /* authenticate user */ |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 891 | if (compat20) { |
| 892 | ssh_kex2(host, hostaddr); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 893 | ssh_userauth2(local_user, server_user, host, keys, nkeys); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 894 | } else { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 895 | ssh_kex(host, hostaddr); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 896 | ssh_userauth1(local_user, server_user, host, keys, nkeys); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 897 | } |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 898 | } |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 899 | |
| 900 | void |
| 901 | ssh_put_password(char *password) |
| 902 | { |
| 903 | int size; |
| 904 | char *padded; |
| 905 | |
Ben Lindstrom | d20d0f3 | 2001-03-10 17:22:20 +0000 | [diff] [blame] | 906 | if (datafellows & SSH_BUG_PASSWORDPAD) { |
Ben Lindstrom | 664408d | 2001-06-09 01:42:01 +0000 | [diff] [blame] | 907 | packet_put_cstring(password); |
Ben Lindstrom | d20d0f3 | 2001-03-10 17:22:20 +0000 | [diff] [blame] | 908 | return; |
| 909 | } |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 910 | size = roundup(strlen(password) + 1, 32); |
| 911 | padded = xmalloc(size); |
| 912 | memset(padded, 0, size); |
| 913 | strlcpy(padded, password, size); |
| 914 | packet_put_string(padded, size); |
| 915 | memset(padded, 0, size); |
| 916 | xfree(padded); |
| 917 | } |