| File: | src/usr.bin/ssh/ssh/../sshconnect.c |
| Warning: | line 1672, column 7 Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r' |
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| 1 | /* $OpenBSD: sshconnect.c,v 1.366 2024/01/11 01:45:36 djm Exp $ */ |
| 2 | /* |
| 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
| 6 | * Code to connect to a remote host, and to perform the client side of the |
| 7 | * login (authentication) dialog. |
| 8 | * |
| 9 | * As far as I am concerned, the code I have written for this software |
| 10 | * can be used freely for any purpose. Any derived versions of this |
| 11 | * software must be clearly marked as such, and if the derived work is |
| 12 | * incompatible with the protocol description in the RFC file, it must be |
| 13 | * called by a name other than "ssh" or "Secure Shell". |
| 14 | */ |
| 15 | |
| 16 | #include <sys/types.h> |
| 17 | #include <sys/wait.h> |
| 18 | #include <sys/stat.h> |
| 19 | #include <sys/socket.h> |
| 20 | #include <sys/time.h> |
| 21 | |
| 22 | #include <net/if.h> |
| 23 | #include <netinet/in.h> |
| 24 | |
| 25 | #include <ctype.h> |
| 26 | #include <errno(*__errno()).h> |
| 27 | #include <fcntl.h> |
| 28 | #include <netdb.h> |
| 29 | #include <limits.h> |
| 30 | #include <paths.h> |
| 31 | #include <signal.h> |
| 32 | #include <pwd.h> |
| 33 | #include <stdio.h> |
| 34 | #include <stdlib.h> |
| 35 | #include <stdarg.h> |
| 36 | #include <string.h> |
| 37 | #include <unistd.h> |
| 38 | #include <ifaddrs.h> |
| 39 | |
| 40 | #include "xmalloc.h" |
| 41 | #include "ssh.h" |
| 42 | #include "sshbuf.h" |
| 43 | #include "packet.h" |
| 44 | #include "sshkey.h" |
| 45 | #include "sshconnect.h" |
| 46 | #include "hostfile.h" |
| 47 | #include "log.h" |
| 48 | #include "misc.h" |
| 49 | #include "readconf.h" |
| 50 | #include "atomicio.h" |
| 51 | #include "dns.h" |
| 52 | #include "monitor_fdpass.h" |
| 53 | #include "ssh2.h" |
| 54 | #include "version.h" |
| 55 | #include "authfile.h" |
| 56 | #include "ssherr.h" |
| 57 | #include "authfd.h" |
| 58 | #include "kex.h" |
| 59 | |
| 60 | struct sshkey *previous_host_key = NULL((void *)0); |
| 61 | |
| 62 | static int matching_host_key_dns = 0; |
| 63 | |
| 64 | static pid_t proxy_command_pid = 0; |
| 65 | |
| 66 | /* import */ |
| 67 | extern int debug_flag; |
| 68 | extern Options options; |
| 69 | extern char *__progname; |
| 70 | |
| 71 | static int show_other_keys(struct hostkeys *, struct sshkey *); |
| 72 | static void warn_changed_key(struct sshkey *); |
| 73 | |
| 74 | /* Expand a proxy command */ |
| 75 | static char * |
| 76 | expand_proxy_command(const char *proxy_command, const char *user, |
| 77 | const char *host, const char *host_arg, int port) |
| 78 | { |
| 79 | char *tmp, *ret, strport[NI_MAXSERV32]; |
| 80 | const char *keyalias = options.host_key_alias ? |
| 81 | options.host_key_alias : host_arg; |
| 82 | |
| 83 | snprintf(strport, sizeof strport, "%d", port); |
| 84 | xasprintf(&tmp, "exec %s", proxy_command); |
| 85 | ret = percent_expand(tmp, |
| 86 | "h", host, |
| 87 | "k", keyalias, |
| 88 | "n", host_arg, |
| 89 | "p", strport, |
| 90 | "r", options.user, |
| 91 | (char *)NULL((void *)0)); |
| 92 | free(tmp); |
| 93 | return ret; |
| 94 | } |
| 95 | |
| 96 | /* |
| 97 | * Connect to the given ssh server using a proxy command that passes a |
| 98 | * a connected fd back to us. |
| 99 | */ |
| 100 | static int |
| 101 | ssh_proxy_fdpass_connect(struct ssh *ssh, const char *host, |
| 102 | const char *host_arg, u_short port, const char *proxy_command) |
| 103 | { |
| 104 | char *command_string; |
| 105 | int sp[2], sock; |
| 106 | pid_t pid; |
| 107 | char *shell; |
| 108 | |
| 109 | if ((shell = getenv("SHELL")) == NULL((void *)0)) |
| 110 | shell = _PATH_BSHELL"/bin/sh"; |
| 111 | |
| 112 | if (socketpair(AF_UNIX1, SOCK_STREAM1, 0, sp) == -1) |
| 113 | fatal("Could not create socketpair to communicate with "sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 114, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Could not create socketpair to communicate with " "proxy dialer: %.100s", strerror((*__errno()))) |
| 114 | "proxy dialer: %.100s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 114, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Could not create socketpair to communicate with " "proxy dialer: %.100s", strerror((*__errno()))); |
| 115 | |
| 116 | command_string = expand_proxy_command(proxy_command, options.user, |
| 117 | host, host_arg, port); |
| 118 | debug("Executing proxy dialer command: %.500s", command_string)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 118 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Executing proxy dialer command: %.500s" , command_string); |
| 119 | |
| 120 | /* Fork and execute the proxy command. */ |
| 121 | if ((pid = fork()) == 0) { |
| 122 | char *argv[10]; |
| 123 | |
| 124 | close(sp[1]); |
| 125 | /* Redirect stdin and stdout. */ |
| 126 | if (sp[0] != 0) { |
| 127 | if (dup2(sp[0], 0) == -1) |
| 128 | perror("dup2 stdin"); |
| 129 | } |
| 130 | if (sp[0] != 1) { |
| 131 | if (dup2(sp[0], 1) == -1) |
| 132 | perror("dup2 stdout"); |
| 133 | } |
| 134 | if (sp[0] >= 2) |
| 135 | close(sp[0]); |
| 136 | |
| 137 | /* |
| 138 | * Stderr is left for non-ControlPersist connections is so |
| 139 | * error messages may be printed on the user's terminal. |
| 140 | */ |
| 141 | if (!debug_flag && options.control_path != NULL((void *)0) && |
| 142 | options.control_persist && stdfd_devnull(0, 0, 1) == -1) |
| 143 | error_f("stdfd_devnull failed")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 143 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "stdfd_devnull failed"); |
| 144 | |
| 145 | argv[0] = shell; |
| 146 | argv[1] = "-c"; |
| 147 | argv[2] = command_string; |
| 148 | argv[3] = NULL((void *)0); |
| 149 | |
| 150 | /* |
| 151 | * Execute the proxy command. |
| 152 | * Note that we gave up any extra privileges above. |
| 153 | */ |
| 154 | execv(argv[0], argv); |
| 155 | perror(argv[0]); |
| 156 | exit(1); |
| 157 | } |
| 158 | /* Parent. */ |
| 159 | if (pid == -1) |
| 160 | fatal("fork failed: %.100s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 160, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "fork failed: %.100s" , strerror((*__errno()))); |
| 161 | close(sp[0]); |
| 162 | free(command_string); |
| 163 | |
| 164 | if ((sock = mm_receive_fd(sp[1])) == -1) |
| 165 | fatal("proxy dialer did not pass back a connection")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 165, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "proxy dialer did not pass back a connection" ); |
| 166 | close(sp[1]); |
| 167 | |
| 168 | while (waitpid(pid, NULL((void *)0), 0) == -1) |
| 169 | if (errno(*__errno()) != EINTR4) |
| 170 | fatal("Couldn't wait for child: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 170, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Couldn't wait for child: %s" , strerror((*__errno()))); |
| 171 | |
| 172 | /* Set the connection file descriptors. */ |
| 173 | if (ssh_packet_set_connection(ssh, sock, sock) == NULL((void *)0)) |
| 174 | return -1; /* ssh_packet_set_connection logs error */ |
| 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Connect to the given ssh server using a proxy command. |
| 181 | */ |
| 182 | static int |
| 183 | ssh_proxy_connect(struct ssh *ssh, const char *host, const char *host_arg, |
| 184 | u_short port, const char *proxy_command) |
| 185 | { |
| 186 | char *command_string; |
| 187 | int pin[2], pout[2]; |
| 188 | pid_t pid; |
| 189 | char *shell; |
| 190 | |
| 191 | if ((shell = getenv("SHELL")) == NULL((void *)0) || *shell == '\0') |
| 192 | shell = _PATH_BSHELL"/bin/sh"; |
| 193 | |
| 194 | /* Create pipes for communicating with the proxy. */ |
| 195 | if (pipe(pin) == -1 || pipe(pout) == -1) |
| 196 | fatal("Could not create pipes to communicate with the proxy: %.100s",sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 197, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Could not create pipes to communicate with the proxy: %.100s" , strerror((*__errno()))) |
| 197 | strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 197, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Could not create pipes to communicate with the proxy: %.100s" , strerror((*__errno()))); |
| 198 | |
| 199 | command_string = expand_proxy_command(proxy_command, options.user, |
| 200 | host, host_arg, port); |
| 201 | debug("Executing proxy command: %.500s", command_string)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 201 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Executing proxy command: %.500s" , command_string); |
| 202 | |
| 203 | /* Fork and execute the proxy command. */ |
| 204 | if ((pid = fork()) == 0) { |
| 205 | char *argv[10]; |
| 206 | |
| 207 | /* Redirect stdin and stdout. */ |
| 208 | close(pin[1]); |
| 209 | if (pin[0] != 0) { |
| 210 | if (dup2(pin[0], 0) == -1) |
| 211 | perror("dup2 stdin"); |
| 212 | close(pin[0]); |
| 213 | } |
| 214 | close(pout[0]); |
| 215 | if (dup2(pout[1], 1) == -1) |
| 216 | perror("dup2 stdout"); |
| 217 | /* Cannot be 1 because pin allocated two descriptors. */ |
| 218 | close(pout[1]); |
| 219 | |
| 220 | /* |
| 221 | * Stderr is left for non-ControlPersist connections is so |
| 222 | * error messages may be printed on the user's terminal. |
| 223 | */ |
| 224 | if (!debug_flag && options.control_path != NULL((void *)0) && |
| 225 | options.control_persist && stdfd_devnull(0, 0, 1) == -1) |
| 226 | error_f("stdfd_devnull failed")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 226 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "stdfd_devnull failed"); |
| 227 | |
| 228 | argv[0] = shell; |
| 229 | argv[1] = "-c"; |
| 230 | argv[2] = command_string; |
| 231 | argv[3] = NULL((void *)0); |
| 232 | |
| 233 | /* |
| 234 | * Execute the proxy command. Note that we gave up any |
| 235 | * extra privileges above. |
| 236 | */ |
| 237 | ssh_signal(SIGPIPE13, SIG_DFL(void (*)(int))0); |
| 238 | execv(argv[0], argv); |
| 239 | perror(argv[0]); |
| 240 | exit(1); |
| 241 | } |
| 242 | /* Parent. */ |
| 243 | if (pid == -1) |
| 244 | fatal("fork failed: %.100s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 244, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "fork failed: %.100s" , strerror((*__errno()))); |
| 245 | else |
| 246 | proxy_command_pid = pid; /* save pid to clean up later */ |
| 247 | |
| 248 | /* Close child side of the descriptors. */ |
| 249 | close(pin[0]); |
| 250 | close(pout[1]); |
| 251 | |
| 252 | /* Free the command name. */ |
| 253 | free(command_string); |
| 254 | |
| 255 | /* Set the connection file descriptors. */ |
| 256 | if (ssh_packet_set_connection(ssh, pout[0], pin[1]) == NULL((void *)0)) |
| 257 | return -1; /* ssh_packet_set_connection logs error */ |
| 258 | |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | void |
| 263 | ssh_kill_proxy_command(void) |
| 264 | { |
| 265 | /* |
| 266 | * Send SIGHUP to proxy command if used. We don't wait() in |
| 267 | * case it hangs and instead rely on init to reap the child |
| 268 | */ |
| 269 | if (proxy_command_pid > 1) |
| 270 | kill(proxy_command_pid, SIGHUP1); |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Search a interface address list (returned from getifaddrs(3)) for an |
| 275 | * address that matches the desired address family on the specified interface. |
| 276 | * Returns 0 and fills in *resultp and *rlenp on success. Returns -1 on failure. |
| 277 | */ |
| 278 | static int |
| 279 | check_ifaddrs(const char *ifname, int af, const struct ifaddrs *ifaddrs, |
| 280 | struct sockaddr_storage *resultp, socklen_t *rlenp) |
| 281 | { |
| 282 | struct sockaddr_in6 *sa6; |
| 283 | struct sockaddr_in *sa; |
| 284 | struct in6_addr *v6addr; |
| 285 | const struct ifaddrs *ifa; |
| 286 | int allow_local; |
| 287 | |
| 288 | /* |
| 289 | * Prefer addresses that are not loopback or linklocal, but use them |
| 290 | * if nothing else matches. |
| 291 | */ |
| 292 | for (allow_local = 0; allow_local < 2; allow_local++) { |
| 293 | for (ifa = ifaddrs; ifa != NULL((void *)0); ifa = ifa->ifa_next) { |
| 294 | if (ifa->ifa_addr == NULL((void *)0) || ifa->ifa_name == NULL((void *)0) || |
| 295 | (ifa->ifa_flags & IFF_UP0x1) == 0 || |
| 296 | ifa->ifa_addr->sa_family != af || |
| 297 | strcmp(ifa->ifa_name, options.bind_interface) != 0) |
| 298 | continue; |
| 299 | switch (ifa->ifa_addr->sa_family) { |
| 300 | case AF_INET2: |
| 301 | sa = (struct sockaddr_in *)ifa->ifa_addr; |
| 302 | if (!allow_local && sa->sin_addr.s_addr == |
| 303 | htonl(INADDR_LOOPBACK)(__uint32_t)(__builtin_constant_p(((u_int32_t)(0x7f000001))) ? (__uint32_t)(((__uint32_t)(((u_int32_t)(0x7f000001))) & 0xff ) << 24 | ((__uint32_t)(((u_int32_t)(0x7f000001))) & 0xff00) << 8 | ((__uint32_t)(((u_int32_t)(0x7f000001)) ) & 0xff0000) >> 8 | ((__uint32_t)(((u_int32_t)(0x7f000001 ))) & 0xff000000) >> 24) : __swap32md(((u_int32_t)( 0x7f000001))))) |
| 304 | continue; |
| 305 | if (*rlenp < sizeof(struct sockaddr_in)) { |
| 306 | error_f("v4 addr doesn't fit")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 306 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "v4 addr doesn't fit"); |
| 307 | return -1; |
| 308 | } |
| 309 | *rlenp = sizeof(struct sockaddr_in); |
| 310 | memcpy(resultp, sa, *rlenp); |
| 311 | return 0; |
| 312 | case AF_INET624: |
| 313 | sa6 = (struct sockaddr_in6 *)ifa->ifa_addr; |
| 314 | v6addr = &sa6->sin6_addr; |
| 315 | if (!allow_local && |
| 316 | (IN6_IS_ADDR_LINKLOCAL(v6addr)(((v6addr)->__u6_addr.__u6_addr8[0] == 0xfe) && (( (v6addr)->__u6_addr.__u6_addr8[1] & 0xc0) == 0x80)) || |
| 317 | IN6_IS_ADDR_LOOPBACK(v6addr)((*(const u_int32_t *)(const void *)(&(v6addr)->__u6_addr .__u6_addr8[0]) == 0) && (*(const u_int32_t *)(const void *)(&(v6addr)->__u6_addr.__u6_addr8[4]) == 0) && (*(const u_int32_t *)(const void *)(&(v6addr)->__u6_addr .__u6_addr8[8]) == 0) && (*(const u_int32_t *)(const void *)(&(v6addr)->__u6_addr.__u6_addr8[12]) == (__uint32_t )(__builtin_constant_p(1) ? (__uint32_t)(((__uint32_t)(1) & 0xff) << 24 | ((__uint32_t)(1) & 0xff00) << 8 | ((__uint32_t)(1) & 0xff0000) >> 8 | ((__uint32_t )(1) & 0xff000000) >> 24) : __swap32md(1)))))) |
| 318 | continue; |
| 319 | if (*rlenp < sizeof(struct sockaddr_in6)) { |
| 320 | error_f("v6 addr doesn't fit")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 320 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "v6 addr doesn't fit"); |
| 321 | return -1; |
| 322 | } |
| 323 | *rlenp = sizeof(struct sockaddr_in6); |
| 324 | memcpy(resultp, sa6, *rlenp); |
| 325 | return 0; |
| 326 | } |
| 327 | } |
| 328 | } |
| 329 | return -1; |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * Creates a socket for use as the ssh connection. |
| 334 | */ |
| 335 | static int |
| 336 | ssh_create_socket(struct addrinfo *ai) |
| 337 | { |
| 338 | int sock, r; |
| 339 | struct sockaddr_storage bindaddr; |
| 340 | socklen_t bindaddrlen = 0; |
| 341 | struct addrinfo hints, *res = NULL((void *)0); |
| 342 | struct ifaddrs *ifaddrs = NULL((void *)0); |
| 343 | char ntop[NI_MAXHOST256]; |
| 344 | |
| 345 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
| 346 | if (sock == -1) { |
| 347 | error("socket: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 347 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "socket: %s", strerror( (*__errno()))); |
| 348 | return -1; |
| 349 | } |
| 350 | (void)fcntl(sock, F_SETFD2, FD_CLOEXEC1); |
| 351 | |
| 352 | /* Use interactive QOS (if specified) until authentication completed */ |
| 353 | if (options.ip_qos_interactive != INT_MAX0x7fffffff) |
| 354 | set_sock_tos(sock, options.ip_qos_interactive); |
| 355 | |
| 356 | /* Bind the socket to an alternative local IP address */ |
| 357 | if (options.bind_address == NULL((void *)0) && options.bind_interface == NULL((void *)0)) |
| 358 | return sock; |
| 359 | |
| 360 | if (options.bind_address != NULL((void *)0)) { |
| 361 | memset(&hints, 0, sizeof(hints)); |
| 362 | hints.ai_family = ai->ai_family; |
| 363 | hints.ai_socktype = ai->ai_socktype; |
| 364 | hints.ai_protocol = ai->ai_protocol; |
| 365 | hints.ai_flags = AI_PASSIVE1; |
| 366 | if ((r = getaddrinfo(options.bind_address, NULL((void *)0), |
| 367 | &hints, &res)) != 0) { |
| 368 | error("getaddrinfo: %s: %s", options.bind_address,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 369 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "getaddrinfo: %s: %s", options .bind_address, ssh_gai_strerror(r)) |
| 369 | ssh_gai_strerror(r))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 369 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "getaddrinfo: %s: %s", options .bind_address, ssh_gai_strerror(r)); |
| 370 | goto fail; |
| 371 | } |
| 372 | if (res == NULL((void *)0)) { |
| 373 | error("getaddrinfo: no addrs")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 373 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "getaddrinfo: no addrs" ); |
| 374 | goto fail; |
| 375 | } |
| 376 | memcpy(&bindaddr, res->ai_addr, res->ai_addrlen); |
| 377 | bindaddrlen = res->ai_addrlen; |
| 378 | } else if (options.bind_interface != NULL((void *)0)) { |
| 379 | if ((r = getifaddrs(&ifaddrs)) != 0) { |
| 380 | error("getifaddrs: %s: %s", options.bind_interface,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 381 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "getifaddrs: %s: %s", options .bind_interface, strerror((*__errno()))) |
| 381 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 381 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "getifaddrs: %s: %s", options .bind_interface, strerror((*__errno()))); |
| 382 | goto fail; |
| 383 | } |
| 384 | bindaddrlen = sizeof(bindaddr); |
| 385 | if (check_ifaddrs(options.bind_interface, ai->ai_family, |
| 386 | ifaddrs, &bindaddr, &bindaddrlen) != 0) { |
| 387 | logit("getifaddrs: %s: no suitable addresses",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 388 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "getifaddrs: %s: no suitable addresses" , options.bind_interface) |
| 388 | options.bind_interface)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 388 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "getifaddrs: %s: no suitable addresses" , options.bind_interface); |
| 389 | goto fail; |
| 390 | } |
| 391 | } |
| 392 | if ((r = getnameinfo((struct sockaddr *)&bindaddr, bindaddrlen, |
| 393 | ntop, sizeof(ntop), NULL((void *)0), 0, NI_NUMERICHOST1)) != 0) { |
| 394 | error_f("getnameinfo failed: %s", ssh_gai_strerror(r))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 394 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "getnameinfo failed: %s" , ssh_gai_strerror(r)); |
| 395 | goto fail; |
| 396 | } |
| 397 | if (bind(sock, (struct sockaddr *)&bindaddr, bindaddrlen) != 0) { |
| 398 | error("bind %s: %s", ntop, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 398 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "bind %s: %s", ntop, strerror ((*__errno()))); |
| 399 | goto fail; |
| 400 | } |
| 401 | debug_f("bound to %s", ntop)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 401 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "bound to %s", ntop); |
| 402 | /* success */ |
| 403 | goto out; |
| 404 | fail: |
| 405 | close(sock); |
| 406 | sock = -1; |
| 407 | out: |
| 408 | if (res != NULL((void *)0)) |
| 409 | freeaddrinfo(res); |
| 410 | if (ifaddrs != NULL((void *)0)) |
| 411 | freeifaddrs(ifaddrs); |
| 412 | return sock; |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * Opens a TCP/IP connection to the remote server on the given host. |
| 417 | * The address of the remote host will be returned in hostaddr. |
| 418 | * If port is 0, the default port will be used. |
| 419 | * Connection_attempts specifies the maximum number of tries (one per |
| 420 | * second). If proxy_command is non-NULL, it specifies the command (with %h |
| 421 | * and %p substituted for host and port, respectively) to use to contact |
| 422 | * the daemon. |
| 423 | */ |
| 424 | static int |
| 425 | ssh_connect_direct(struct ssh *ssh, const char *host, struct addrinfo *aitop, |
| 426 | struct sockaddr_storage *hostaddr, u_short port, int connection_attempts, |
| 427 | int *timeout_ms, int want_keepalive) |
| 428 | { |
| 429 | int on = 1, saved_timeout_ms = *timeout_ms; |
| 430 | int oerrno, sock = -1, attempt; |
| 431 | char ntop[NI_MAXHOST256], strport[NI_MAXSERV32]; |
| 432 | struct addrinfo *ai; |
| 433 | |
| 434 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 434 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "entering"); |
| 435 | memset(ntop, 0, sizeof(ntop)); |
| 436 | memset(strport, 0, sizeof(strport)); |
| 437 | |
| 438 | for (attempt = 0; attempt < connection_attempts; attempt++) { |
| 439 | if (attempt > 0) { |
| 440 | /* Sleep a moment before retrying. */ |
| 441 | sleep(1); |
| 442 | debug("Trying again...")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 442 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Trying again..."); |
| 443 | } |
| 444 | /* |
| 445 | * Loop through addresses for this host, and try each one in |
| 446 | * sequence until the connection succeeds. |
| 447 | */ |
| 448 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 449 | if (ai->ai_family != AF_INET2 && |
| 450 | ai->ai_family != AF_INET624) { |
| 451 | errno(*__errno()) = EAFNOSUPPORT47; |
| 452 | continue; |
| 453 | } |
| 454 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, |
| 455 | ntop, sizeof(ntop), strport, sizeof(strport), |
| 456 | NI_NUMERICHOST1|NI_NUMERICSERV2) != 0) { |
| 457 | oerrno = errno(*__errno()); |
| 458 | error_f("getnameinfo failed")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 458 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "getnameinfo failed"); |
| 459 | errno(*__errno()) = oerrno; |
| 460 | continue; |
| 461 | } |
| 462 | if (options.address_family != AF_UNSPEC0 && |
| 463 | ai->ai_family != options.address_family) { |
| 464 | debug2_f("skipping address [%s]:%s: "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 465 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "skipping address [%s]:%s: " "wrong address family", ntop, strport) |
| 465 | "wrong address family", ntop, strport)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 465 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "skipping address [%s]:%s: " "wrong address family", ntop, strport); |
| 466 | errno(*__errno()) = EAFNOSUPPORT47; |
| 467 | continue; |
| 468 | } |
| 469 | |
| 470 | debug("Connecting to %.200s [%.100s] port %s.",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 471 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Connecting to %.200s [%.100s] port %s." , host, ntop, strport) |
| 471 | host, ntop, strport)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 471 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Connecting to %.200s [%.100s] port %s." , host, ntop, strport); |
| 472 | |
| 473 | /* Create a socket for connecting. */ |
| 474 | sock = ssh_create_socket(ai); |
| 475 | if (sock < 0) { |
| 476 | /* Any error is already output */ |
| 477 | errno(*__errno()) = 0; |
| 478 | continue; |
| 479 | } |
| 480 | |
| 481 | *timeout_ms = saved_timeout_ms; |
| 482 | if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen, |
| 483 | timeout_ms) >= 0) { |
| 484 | /* Successful connection. */ |
| 485 | memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen); |
| 486 | break; |
| 487 | } else { |
| 488 | oerrno = errno(*__errno()); |
| 489 | debug("connect to address %s port %s: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 490 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "connect to address %s port %s: %s" , ntop, strport, strerror((*__errno()))) |
| 490 | ntop, strport, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 490 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "connect to address %s port %s: %s" , ntop, strport, strerror((*__errno()))); |
| 491 | close(sock); |
| 492 | sock = -1; |
| 493 | errno(*__errno()) = oerrno; |
| 494 | } |
| 495 | } |
| 496 | if (sock != -1) |
| 497 | break; /* Successful connection. */ |
| 498 | } |
| 499 | |
| 500 | /* Return failure if we didn't get a successful connection. */ |
| 501 | if (sock == -1) { |
| 502 | error("ssh: connect to host %s port %s: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 503 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "ssh: connect to host %s port %s: %s" , host, strport, (*__errno()) == 0 ? "failure" : strerror((*__errno ()))) |
| 503 | host, strport, errno == 0 ? "failure" : strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 503 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "ssh: connect to host %s port %s: %s" , host, strport, (*__errno()) == 0 ? "failure" : strerror((*__errno ()))); |
| 504 | return -1; |
| 505 | } |
| 506 | |
| 507 | debug("Connection established.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 507 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Connection established." ); |
| 508 | |
| 509 | /* Set SO_KEEPALIVE if requested. */ |
| 510 | if (want_keepalive && |
| 511 | setsockopt(sock, SOL_SOCKET0xffff, SO_KEEPALIVE0x0008, (void *)&on, |
| 512 | sizeof(on)) == -1) |
| 513 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 513 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt SO_KEEPALIVE: %.100s" , strerror((*__errno()))); |
| 514 | |
| 515 | /* Set the connection. */ |
| 516 | if (ssh_packet_set_connection(ssh, sock, sock) == NULL((void *)0)) |
| 517 | return -1; /* ssh_packet_set_connection logs error */ |
| 518 | |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | int |
| 523 | ssh_connect(struct ssh *ssh, const char *host, const char *host_arg, |
| 524 | struct addrinfo *addrs, struct sockaddr_storage *hostaddr, u_short port, |
| 525 | int connection_attempts, int *timeout_ms, int want_keepalive) |
| 526 | { |
| 527 | int in, out; |
| 528 | |
| 529 | if (options.proxy_command == NULL((void *)0)) { |
| 530 | return ssh_connect_direct(ssh, host, addrs, hostaddr, port, |
| 531 | connection_attempts, timeout_ms, want_keepalive); |
| 532 | } else if (strcmp(options.proxy_command, "-") == 0) { |
| 533 | if ((in = dup(STDIN_FILENO0)) == -1 || |
| 534 | (out = dup(STDOUT_FILENO1)) == -1) { |
| 535 | if (in >= 0) |
| 536 | close(in); |
| 537 | error_f("dup() in/out failed")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 537 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "dup() in/out failed"); |
| 538 | return -1; /* ssh_packet_set_connection logs error */ |
| 539 | } |
| 540 | if ((ssh_packet_set_connection(ssh, in, out)) == NULL((void *)0)) |
| 541 | return -1; /* ssh_packet_set_connection logs error */ |
| 542 | return 0; |
| 543 | } else if (options.proxy_use_fdpass) { |
| 544 | return ssh_proxy_fdpass_connect(ssh, host, host_arg, port, |
| 545 | options.proxy_command); |
| 546 | } |
| 547 | return ssh_proxy_connect(ssh, host, host_arg, port, |
| 548 | options.proxy_command); |
| 549 | } |
| 550 | |
| 551 | /* defaults to 'no' */ |
| 552 | static int |
| 553 | confirm(const char *prompt, const char *fingerprint) |
| 554 | { |
| 555 | const char *msg, *again = "Please type 'yes' or 'no': "; |
| 556 | const char *again_fp = "Please type 'yes', 'no' or the fingerprint: "; |
| 557 | char *p, *cp; |
| 558 | int ret = -1; |
| 559 | |
| 560 | if (options.batch_mode) |
| 561 | return 0; |
| 562 | for (msg = prompt;;msg = fingerprint ? again_fp : again) { |
| 563 | cp = p = read_passphrase(msg, RP_ECHO0x0001); |
| 564 | if (p == NULL((void *)0)) |
| 565 | return 0; |
| 566 | p += strspn(p, " \t"); /* skip leading whitespace */ |
| 567 | p[strcspn(p, " \t\n")] = '\0'; /* remove trailing whitespace */ |
| 568 | if (p[0] == '\0' || strcasecmp(p, "no") == 0) |
| 569 | ret = 0; |
| 570 | else if (strcasecmp(p, "yes") == 0 || (fingerprint != NULL((void *)0) && |
| 571 | strcmp(p, fingerprint) == 0)) |
| 572 | ret = 1; |
| 573 | free(cp); |
| 574 | if (ret != -1) |
| 575 | return ret; |
| 576 | } |
| 577 | } |
| 578 | |
| 579 | static int |
| 580 | sockaddr_is_local(struct sockaddr *hostaddr) |
| 581 | { |
| 582 | switch (hostaddr->sa_family) { |
| 583 | case AF_INET2: |
| 584 | return (ntohl(((struct sockaddr_in *)hostaddr)->(__uint32_t)(__builtin_constant_p(((struct sockaddr_in *)hostaddr )-> sin_addr.s_addr) ? (__uint32_t)(((__uint32_t)(((struct sockaddr_in *)hostaddr)-> sin_addr.s_addr) & 0xff) << 24 | ((__uint32_t)(((struct sockaddr_in *)hostaddr)-> sin_addr .s_addr) & 0xff00) << 8 | ((__uint32_t)(((struct sockaddr_in *)hostaddr)-> sin_addr.s_addr) & 0xff0000) >> 8 | ((__uint32_t)(((struct sockaddr_in *)hostaddr)-> sin_addr .s_addr) & 0xff000000) >> 24) : __swap32md(((struct sockaddr_in *)hostaddr)-> sin_addr.s_addr)) |
| 585 | sin_addr.s_addr)(__uint32_t)(__builtin_constant_p(((struct sockaddr_in *)hostaddr )-> sin_addr.s_addr) ? (__uint32_t)(((__uint32_t)(((struct sockaddr_in *)hostaddr)-> sin_addr.s_addr) & 0xff) << 24 | ((__uint32_t)(((struct sockaddr_in *)hostaddr)-> sin_addr .s_addr) & 0xff00) << 8 | ((__uint32_t)(((struct sockaddr_in *)hostaddr)-> sin_addr.s_addr) & 0xff0000) >> 8 | ((__uint32_t)(((struct sockaddr_in *)hostaddr)-> sin_addr .s_addr) & 0xff000000) >> 24) : __swap32md(((struct sockaddr_in *)hostaddr)-> sin_addr.s_addr)) >> 24) == IN_LOOPBACKNET127; |
| 586 | case AF_INET624: |
| 587 | return IN6_IS_ADDR_LOOPBACK(((*(const u_int32_t *)(const void *)(&(&(((struct sockaddr_in6 *)hostaddr)->sin6_addr))->__u6_addr.__u6_addr8[0]) == 0 ) && (*(const u_int32_t *)(const void *)(&(&( ((struct sockaddr_in6 *)hostaddr)->sin6_addr))->__u6_addr .__u6_addr8[4]) == 0) && (*(const u_int32_t *)(const void *)(&(&(((struct sockaddr_in6 *)hostaddr)->sin6_addr ))->__u6_addr.__u6_addr8[8]) == 0) && (*(const u_int32_t *)(const void *)(&(&(((struct sockaddr_in6 *)hostaddr )->sin6_addr))->__u6_addr.__u6_addr8[12]) == (__uint32_t )(__builtin_constant_p(1) ? (__uint32_t)(((__uint32_t)(1) & 0xff) << 24 | ((__uint32_t)(1) & 0xff00) << 8 | ((__uint32_t)(1) & 0xff0000) >> 8 | ((__uint32_t )(1) & 0xff000000) >> 24) : __swap32md(1)))) |
| 588 | &(((struct sockaddr_in6 *)hostaddr)->sin6_addr))((*(const u_int32_t *)(const void *)(&(&(((struct sockaddr_in6 *)hostaddr)->sin6_addr))->__u6_addr.__u6_addr8[0]) == 0 ) && (*(const u_int32_t *)(const void *)(&(&( ((struct sockaddr_in6 *)hostaddr)->sin6_addr))->__u6_addr .__u6_addr8[4]) == 0) && (*(const u_int32_t *)(const void *)(&(&(((struct sockaddr_in6 *)hostaddr)->sin6_addr ))->__u6_addr.__u6_addr8[8]) == 0) && (*(const u_int32_t *)(const void *)(&(&(((struct sockaddr_in6 *)hostaddr )->sin6_addr))->__u6_addr.__u6_addr8[12]) == (__uint32_t )(__builtin_constant_p(1) ? (__uint32_t)(((__uint32_t)(1) & 0xff) << 24 | ((__uint32_t)(1) & 0xff00) << 8 | ((__uint32_t)(1) & 0xff0000) >> 8 | ((__uint32_t )(1) & 0xff000000) >> 24) : __swap32md(1)))); |
| 589 | default: |
| 590 | return 0; |
| 591 | } |
| 592 | } |
| 593 | |
| 594 | /* |
| 595 | * Prepare the hostname and ip address strings that are used to lookup |
| 596 | * host keys in known_hosts files. These may have a port number appended. |
| 597 | */ |
| 598 | void |
| 599 | get_hostfile_hostname_ipaddr(char *hostname, struct sockaddr *hostaddr, |
| 600 | u_short port, char **hostfile_hostname, char **hostfile_ipaddr) |
| 601 | { |
| 602 | char ntop[NI_MAXHOST256]; |
| 603 | |
| 604 | /* |
| 605 | * We don't have the remote ip-address for connections |
| 606 | * using a proxy command |
| 607 | */ |
| 608 | if (hostfile_ipaddr != NULL((void *)0)) { |
| 609 | if (options.proxy_command == NULL((void *)0)) { |
| 610 | if (getnameinfo(hostaddr, hostaddr->sa_len, |
| 611 | ntop, sizeof(ntop), NULL((void *)0), 0, NI_NUMERICHOST1) != 0) |
| 612 | fatal_f("getnameinfo failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 612, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "getnameinfo failed" ); |
| 613 | *hostfile_ipaddr = put_host_port(ntop, port); |
| 614 | } else { |
| 615 | *hostfile_ipaddr = xstrdup("<no hostip for proxy " |
| 616 | "command>"); |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | /* |
| 621 | * Allow the user to record the key under a different name or |
| 622 | * differentiate a non-standard port. This is useful for ssh |
| 623 | * tunneling over forwarded connections or if you run multiple |
| 624 | * sshd's on different ports on the same machine. |
| 625 | */ |
| 626 | if (hostfile_hostname != NULL((void *)0)) { |
| 627 | if (options.host_key_alias != NULL((void *)0)) { |
| 628 | *hostfile_hostname = xstrdup(options.host_key_alias); |
| 629 | debug("using hostkeyalias: %s", *hostfile_hostname)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 629 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "using hostkeyalias: %s" , *hostfile_hostname); |
| 630 | } else { |
| 631 | *hostfile_hostname = put_host_port(hostname, port); |
| 632 | } |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | /* returns non-zero if path appears in hostfiles, or 0 if not. */ |
| 637 | static int |
| 638 | path_in_hostfiles(const char *path, char **hostfiles, u_int num_hostfiles) |
| 639 | { |
| 640 | u_int i; |
| 641 | |
| 642 | for (i = 0; i < num_hostfiles; i++) { |
| 643 | if (strcmp(path, hostfiles[i]) == 0) |
| 644 | return 1; |
| 645 | } |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | struct find_by_key_ctx { |
| 650 | const char *host, *ip; |
| 651 | const struct sshkey *key; |
| 652 | char **names; |
| 653 | u_int nnames; |
| 654 | }; |
| 655 | |
| 656 | /* Try to replace home directory prefix (per $HOME) with a ~/ sequence */ |
| 657 | static char * |
| 658 | try_tilde_unexpand(const char *path) |
| 659 | { |
| 660 | char *home, *ret = NULL((void *)0); |
| 661 | size_t l; |
| 662 | |
| 663 | if (*path != '/') |
| 664 | return xstrdup(path); |
| 665 | if ((home = getenv("HOME")) == NULL((void *)0) || (l = strlen(home)) == 0) |
| 666 | return xstrdup(path); |
| 667 | if (strncmp(path, home, l) != 0) |
| 668 | return xstrdup(path); |
| 669 | /* |
| 670 | * ensure we have matched on a path boundary: either the $HOME that |
| 671 | * we just compared ends with a '/' or the next character of the path |
| 672 | * must be a '/'. |
| 673 | */ |
| 674 | if (home[l - 1] != '/' && path[l] != '/') |
| 675 | return xstrdup(path); |
| 676 | if (path[l] == '/') |
| 677 | l++; |
| 678 | xasprintf(&ret, "~/%s", path + l); |
| 679 | return ret; |
| 680 | } |
| 681 | |
| 682 | static int |
| 683 | hostkeys_find_by_key_cb(struct hostkey_foreach_line *l, void *_ctx) |
| 684 | { |
| 685 | struct find_by_key_ctx *ctx = (struct find_by_key_ctx *)_ctx; |
| 686 | char *path; |
| 687 | |
| 688 | /* we are looking for keys with names that *do not* match */ |
| 689 | if ((l->match & HKF_MATCH_HOST(1)) != 0) |
| 690 | return 0; |
| 691 | /* not interested in marker lines */ |
| 692 | if (l->marker != MRK_NONE) |
| 693 | return 0; |
| 694 | /* we are only interested in exact key matches */ |
| 695 | if (l->key == NULL((void *)0) || !sshkey_equal(ctx->key, l->key)) |
| 696 | return 0; |
| 697 | path = try_tilde_unexpand(l->path); |
| 698 | debug_f("found matching key in %s:%lu", path, l->linenum)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 698 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "found matching key in %s:%lu" , path, l->linenum); |
| 699 | ctx->names = xrecallocarray(ctx->names, |
| 700 | ctx->nnames, ctx->nnames + 1, sizeof(*ctx->names)); |
| 701 | xasprintf(&ctx->names[ctx->nnames], "%s:%lu: %s", path, l->linenum, |
| 702 | strncmp(l->hosts, HASH_MAGIC"|1|", strlen(HASH_MAGIC"|1|")) == 0 ? |
| 703 | "[hashed name]" : l->hosts); |
| 704 | ctx->nnames++; |
| 705 | free(path); |
| 706 | return 0; |
| 707 | } |
| 708 | |
| 709 | static int |
| 710 | hostkeys_find_by_key_hostfile(const char *file, const char *which, |
| 711 | struct find_by_key_ctx *ctx) |
| 712 | { |
| 713 | int r; |
| 714 | |
| 715 | debug3_f("trying %s hostfile \"%s\"", which, file)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 715 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "trying %s hostfile \"%s\"" , which, file); |
| 716 | if ((r = hostkeys_foreach(file, hostkeys_find_by_key_cb, ctx, |
| 717 | ctx->host, ctx->ip, HKF_WANT_PARSE_KEY(1<<1), 0)) != 0) { |
| 718 | if (r == SSH_ERR_SYSTEM_ERROR-24 && errno(*__errno()) == ENOENT2) { |
| 719 | debug_f("hostkeys file %s does not exist", file)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 719 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "hostkeys file %s does not exist" , file); |
| 720 | return 0; |
| 721 | } |
| 722 | error_fr(r, "hostkeys_foreach failed for %s", file)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 722 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "hostkeys_foreach failed for %s" , file); |
| 723 | return r; |
| 724 | } |
| 725 | return 0; |
| 726 | } |
| 727 | |
| 728 | /* |
| 729 | * Find 'key' in known hosts file(s) that do not match host/ip. |
| 730 | * Used to display also-known-as information for previously-unseen hostkeys. |
| 731 | */ |
| 732 | static void |
| 733 | hostkeys_find_by_key(const char *host, const char *ip, const struct sshkey *key, |
| 734 | char **user_hostfiles, u_int num_user_hostfiles, |
| 735 | char **system_hostfiles, u_int num_system_hostfiles, |
| 736 | char ***names, u_int *nnames) |
| 737 | { |
| 738 | struct find_by_key_ctx ctx = {0, 0, 0, 0, 0}; |
| 739 | u_int i; |
| 740 | |
| 741 | *names = NULL((void *)0); |
| 742 | *nnames = 0; |
| 743 | |
| 744 | if (key == NULL((void *)0) || sshkey_is_cert(key)) |
| 745 | return; |
| 746 | |
| 747 | ctx.host = host; |
| 748 | ctx.ip = ip; |
| 749 | ctx.key = key; |
| 750 | |
| 751 | for (i = 0; i < num_user_hostfiles; i++) { |
| 752 | if (hostkeys_find_by_key_hostfile(user_hostfiles[i], |
| 753 | "user", &ctx) != 0) |
| 754 | goto fail; |
| 755 | } |
| 756 | for (i = 0; i < num_system_hostfiles; i++) { |
| 757 | if (hostkeys_find_by_key_hostfile(system_hostfiles[i], |
| 758 | "system", &ctx) != 0) |
| 759 | goto fail; |
| 760 | } |
| 761 | /* success */ |
| 762 | *names = ctx.names; |
| 763 | *nnames = ctx.nnames; |
| 764 | ctx.names = NULL((void *)0); |
| 765 | ctx.nnames = 0; |
| 766 | return; |
| 767 | fail: |
| 768 | for (i = 0; i < ctx.nnames; i++) |
| 769 | free(ctx.names[i]); |
| 770 | free(ctx.names); |
| 771 | } |
| 772 | |
| 773 | #define MAX_OTHER_NAMES8 8 /* Maximum number of names to list */ |
| 774 | static char * |
| 775 | other_hostkeys_message(const char *host, const char *ip, |
| 776 | const struct sshkey *key, |
| 777 | char **user_hostfiles, u_int num_user_hostfiles, |
| 778 | char **system_hostfiles, u_int num_system_hostfiles) |
| 779 | { |
| 780 | char *ret = NULL((void *)0), **othernames = NULL((void *)0); |
| 781 | u_int i, n, num_othernames = 0; |
| 782 | |
| 783 | hostkeys_find_by_key(host, ip, key, |
| 784 | user_hostfiles, num_user_hostfiles, |
| 785 | system_hostfiles, num_system_hostfiles, |
| 786 | &othernames, &num_othernames); |
| 787 | if (num_othernames == 0) |
| 788 | return xstrdup("This key is not known by any other names."); |
| 789 | |
| 790 | xasprintf(&ret, "This host key is known by the following other " |
| 791 | "names/addresses:"); |
| 792 | |
| 793 | n = num_othernames; |
| 794 | if (n > MAX_OTHER_NAMES8) |
| 795 | n = MAX_OTHER_NAMES8; |
| 796 | for (i = 0; i < n; i++) { |
| 797 | xextendf(&ret, "\n", " %s", othernames[i]); |
| 798 | } |
| 799 | if (n < num_othernames) { |
| 800 | xextendf(&ret, "\n", " (%d additional names omitted)", |
| 801 | num_othernames - n); |
| 802 | } |
| 803 | for (i = 0; i < num_othernames; i++) |
| 804 | free(othernames[i]); |
| 805 | free(othernames); |
| 806 | return ret; |
| 807 | } |
| 808 | |
| 809 | void |
| 810 | load_hostkeys_command(struct hostkeys *hostkeys, const char *command_template, |
| 811 | const char *invocation, const struct ssh_conn_info *cinfo, |
| 812 | const struct sshkey *host_key, const char *hostfile_hostname) |
| 813 | { |
| 814 | int r, i, ac = 0; |
| 815 | char *key_fp = NULL((void *)0), *keytext = NULL((void *)0), *tmp; |
| 816 | char *command = NULL((void *)0), *tag = NULL((void *)0), **av = NULL((void *)0); |
| 817 | FILE *f = NULL((void *)0); |
| 818 | pid_t pid; |
| 819 | void (*osigchld)(int); |
| 820 | |
| 821 | xasprintf(&tag, "KnownHostsCommand-%s", invocation); |
| 822 | |
| 823 | if (host_key != NULL((void *)0)) { |
| 824 | if ((key_fp = sshkey_fingerprint(host_key, |
| 825 | options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL((void *)0)) |
| 826 | fatal_f("sshkey_fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 826, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshkey_fingerprint failed" ); |
| 827 | if ((r = sshkey_to_base64(host_key, &keytext)) != 0) |
| 828 | fatal_fr(r, "sshkey_to_base64 failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 828, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshkey_to_base64 failed" ); |
| 829 | } |
| 830 | /* |
| 831 | * NB. all returns later this function should go via "out" to |
| 832 | * ensure the original SIGCHLD handler is restored properly. |
| 833 | */ |
| 834 | osigchld = ssh_signal(SIGCHLD20, SIG_DFL(void (*)(int))0); |
| 835 | |
| 836 | /* Turn the command into an argument vector */ |
| 837 | if (argv_split(command_template, &ac, &av, 0) != 0) { |
| 838 | error("%s \"%s\" contains invalid quotes", tag,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 839 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%s \"%s\" contains invalid quotes" , tag, command_template) |
| 839 | command_template)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 839 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%s \"%s\" contains invalid quotes" , tag, command_template); |
| 840 | goto out; |
| 841 | } |
| 842 | if (ac == 0) { |
| 843 | error("%s \"%s\" yielded no arguments", tag,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 844 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%s \"%s\" yielded no arguments" , tag, command_template) |
| 844 | command_template)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 844 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%s \"%s\" yielded no arguments" , tag, command_template); |
| 845 | goto out; |
| 846 | } |
| 847 | for (i = 1; i < ac; i++) { |
| 848 | tmp = percent_dollar_expand(av[i], |
| 849 | DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo)"C", cinfo->conn_hash_hex, "L", cinfo->shorthost, "i", cinfo ->uidstr, "k", cinfo->keyalias, "l", cinfo->thishost , "n", cinfo->host_arg, "p", cinfo->portstr, "d", cinfo ->homedir, "h", cinfo->remhost, "r", cinfo->remuser, "u", cinfo->locuser, "j", cinfo->jmphost, |
| 850 | "H", hostfile_hostname, |
| 851 | "I", invocation, |
| 852 | "t", host_key == NULL((void *)0) ? "NONE" : sshkey_ssh_name(host_key), |
| 853 | "f", key_fp == NULL((void *)0) ? "NONE" : key_fp, |
| 854 | "K", keytext == NULL((void *)0) ? "NONE" : keytext, |
| 855 | (char *)NULL((void *)0)); |
| 856 | if (tmp == NULL((void *)0)) |
| 857 | fatal_f("percent_expand failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 857, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "percent_expand failed" ); |
| 858 | free(av[i]); |
| 859 | av[i] = tmp; |
| 860 | } |
| 861 | /* Prepare a printable command for logs, etc. */ |
| 862 | command = argv_assemble(ac, av); |
| 863 | |
| 864 | if ((pid = subprocess(tag, command, ac, av, &f, |
| 865 | SSH_SUBPROCESS_STDOUT_CAPTURE(1<<1)|SSH_SUBPROCESS_UNSAFE_PATH(1<<3)| |
| 866 | SSH_SUBPROCESS_PRESERVE_ENV(1<<4), NULL((void *)0), NULL((void *)0), NULL((void *)0))) == 0) |
| 867 | goto out; |
| 868 | |
| 869 | load_hostkeys_file(hostkeys, hostfile_hostname, tag, f, 1); |
| 870 | |
| 871 | if (exited_cleanly(pid, tag, command, 0) != 0) |
| 872 | fatal("KnownHostsCommand failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 872, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "KnownHostsCommand failed" ); |
| 873 | |
| 874 | out: |
| 875 | if (f != NULL((void *)0)) |
| 876 | fclose(f); |
| 877 | ssh_signal(SIGCHLD20, osigchld); |
| 878 | for (i = 0; i < ac; i++) |
| 879 | free(av[i]); |
| 880 | free(av); |
| 881 | free(tag); |
| 882 | free(command); |
| 883 | free(key_fp); |
| 884 | free(keytext); |
| 885 | } |
| 886 | |
| 887 | /* |
| 888 | * check whether the supplied host key is valid, return -1 if the key |
| 889 | * is not valid. user_hostfile[0] will not be updated if 'readonly' is true. |
| 890 | */ |
| 891 | #define RDRW0 0 |
| 892 | #define RDONLY1 1 |
| 893 | #define ROQUIET2 2 |
| 894 | static int |
| 895 | check_host_key(char *hostname, const struct ssh_conn_info *cinfo, |
| 896 | struct sockaddr *hostaddr, u_short port, |
| 897 | struct sshkey *host_key, int readonly, int clobber_port, |
| 898 | char **user_hostfiles, u_int num_user_hostfiles, |
| 899 | char **system_hostfiles, u_int num_system_hostfiles, |
| 900 | const char *hostfile_command) |
| 901 | { |
| 902 | HostStatus host_status = -1, ip_status = -1; |
| 903 | struct sshkey *raw_key = NULL((void *)0); |
| 904 | char *ip = NULL((void *)0), *host = NULL((void *)0); |
| 905 | char hostline[1000], *hostp, *fp, *ra; |
| 906 | char msg[1024]; |
| 907 | const char *type, *fail_reason = NULL((void *)0); |
| 908 | const struct hostkey_entry *host_found = NULL((void *)0), *ip_found = NULL((void *)0); |
| 909 | int len, cancelled_forwarding = 0, confirmed; |
| 910 | int local = sockaddr_is_local(hostaddr); |
| 911 | int r, want_cert = sshkey_is_cert(host_key), host_ip_differ = 0; |
| 912 | int hostkey_trusted = 0; /* Known or explicitly accepted by user */ |
| 913 | struct hostkeys *host_hostkeys, *ip_hostkeys; |
| 914 | u_int i; |
| 915 | |
| 916 | /* |
| 917 | * Force accepting of the host key for loopback/localhost. The |
| 918 | * problem is that if the home directory is NFS-mounted to multiple |
| 919 | * machines, localhost will refer to a different machine in each of |
| 920 | * them, and the user will get bogus HOST_CHANGED warnings. This |
| 921 | * essentially disables host authentication for localhost; however, |
| 922 | * this is probably not a real problem. |
| 923 | */ |
| 924 | if (options.no_host_authentication_for_localhost == 1 && local && |
| 925 | options.host_key_alias == NULL((void *)0)) { |
| 926 | debug("Forcing accepting of host key for "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 927 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Forcing accepting of host key for " "loopback/localhost.") |
| 927 | "loopback/localhost.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 927 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Forcing accepting of host key for " "loopback/localhost."); |
| 928 | options.update_hostkeys = 0; |
| 929 | return 0; |
| 930 | } |
| 931 | |
| 932 | /* |
| 933 | * Don't ever try to write an invalid name to a known hosts file. |
| 934 | * Note: do this before get_hostfile_hostname_ipaddr() to catch |
| 935 | * '[' or ']' in the name before they are added. |
| 936 | */ |
| 937 | if (strcspn(hostname, "@?*#[]|'\'\"\\") != strlen(hostname)) { |
| 938 | debug_f("invalid hostname \"%s\"; will not record: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 939 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "invalid hostname \"%s\"; will not record: %s" , hostname, fail_reason) |
| 939 | hostname, fail_reason)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 939 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "invalid hostname \"%s\"; will not record: %s" , hostname, fail_reason); |
| 940 | readonly = RDONLY1; |
| 941 | } |
| 942 | |
| 943 | /* |
| 944 | * Prepare the hostname and address strings used for hostkey lookup. |
| 945 | * In some cases, these will have a port number appended. |
| 946 | */ |
| 947 | get_hostfile_hostname_ipaddr(hostname, hostaddr, |
| 948 | clobber_port ? 0 : port, &host, &ip); |
| 949 | |
| 950 | /* |
| 951 | * Turn off check_host_ip if the connection is to localhost, via proxy |
| 952 | * command or if we don't have a hostname to compare with |
| 953 | */ |
| 954 | if (options.check_host_ip && (local || |
| 955 | strcmp(hostname, ip) == 0 || options.proxy_command != NULL((void *)0))) |
| 956 | options.check_host_ip = 0; |
| 957 | |
| 958 | host_hostkeys = init_hostkeys(); |
| 959 | for (i = 0; i < num_user_hostfiles; i++) |
| 960 | load_hostkeys(host_hostkeys, host, user_hostfiles[i], 0); |
| 961 | for (i = 0; i < num_system_hostfiles; i++) |
| 962 | load_hostkeys(host_hostkeys, host, system_hostfiles[i], 0); |
| 963 | if (hostfile_command != NULL((void *)0) && !clobber_port) { |
| 964 | load_hostkeys_command(host_hostkeys, hostfile_command, |
| 965 | "HOSTNAME", cinfo, host_key, host); |
| 966 | } |
| 967 | |
| 968 | ip_hostkeys = NULL((void *)0); |
| 969 | if (!want_cert && options.check_host_ip) { |
| 970 | ip_hostkeys = init_hostkeys(); |
| 971 | for (i = 0; i < num_user_hostfiles; i++) |
| 972 | load_hostkeys(ip_hostkeys, ip, user_hostfiles[i], 0); |
| 973 | for (i = 0; i < num_system_hostfiles; i++) |
| 974 | load_hostkeys(ip_hostkeys, ip, system_hostfiles[i], 0); |
| 975 | if (hostfile_command != NULL((void *)0) && !clobber_port) { |
| 976 | load_hostkeys_command(ip_hostkeys, hostfile_command, |
| 977 | "ADDRESS", cinfo, host_key, ip); |
| 978 | } |
| 979 | } |
| 980 | |
| 981 | retry: |
| 982 | /* Reload these as they may have changed on cert->key downgrade */ |
| 983 | want_cert = sshkey_is_cert(host_key); |
| 984 | type = sshkey_type(host_key); |
| 985 | |
| 986 | /* |
| 987 | * Check if the host key is present in the user's list of known |
| 988 | * hosts or in the systemwide list. |
| 989 | */ |
| 990 | host_status = check_key_in_hostkeys(host_hostkeys, host_key, |
| 991 | &host_found); |
| 992 | |
| 993 | /* |
| 994 | * If there are no hostfiles, or if the hostkey was found via |
| 995 | * KnownHostsCommand, then don't try to touch the disk. |
| 996 | */ |
| 997 | if (!readonly && (num_user_hostfiles == 0 || |
| 998 | (host_found != NULL((void *)0) && host_found->note != 0))) |
| 999 | readonly = RDONLY1; |
| 1000 | |
| 1001 | /* |
| 1002 | * Also perform check for the ip address, skip the check if we are |
| 1003 | * localhost, looking for a certificate, or the hostname was an ip |
| 1004 | * address to begin with. |
| 1005 | */ |
| 1006 | if (!want_cert && ip_hostkeys != NULL((void *)0)) { |
| 1007 | ip_status = check_key_in_hostkeys(ip_hostkeys, host_key, |
| 1008 | &ip_found); |
| 1009 | if (host_status == HOST_CHANGED && |
| 1010 | (ip_status != HOST_CHANGED || |
| 1011 | (ip_found != NULL((void *)0) && |
| 1012 | !sshkey_equal(ip_found->key, host_found->key)))) |
| 1013 | host_ip_differ = 1; |
| 1014 | } else |
| 1015 | ip_status = host_status; |
| 1016 | |
| 1017 | switch (host_status) { |
| 1018 | case HOST_OK: |
| 1019 | /* The host is known and the key matches. */ |
| 1020 | debug("Host '%.200s' is known and matches the %s host %s.",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1021 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Host '%.200s' is known and matches the %s host %s." , host, type, want_cert ? "certificate" : "key") |
| 1021 | host, type, want_cert ? "certificate" : "key")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1021 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Host '%.200s' is known and matches the %s host %s." , host, type, want_cert ? "certificate" : "key"); |
| 1022 | debug("Found %s in %s:%lu", want_cert ? "CA key" : "key",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1023 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Found %s in %s:%lu", want_cert ? "CA key" : "key", host_found->file, host_found->line ) |
| 1023 | host_found->file, host_found->line)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1023 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Found %s in %s:%lu", want_cert ? "CA key" : "key", host_found->file, host_found->line ); |
| 1024 | if (want_cert) { |
| 1025 | if (sshkey_cert_check_host(host_key, |
| 1026 | options.host_key_alias == NULL((void *)0) ? |
| 1027 | hostname : options.host_key_alias, 0, |
| 1028 | options.ca_sign_algorithms, &fail_reason) != 0) { |
| 1029 | error("%s", fail_reason)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1029 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%s", fail_reason); |
| 1030 | goto fail; |
| 1031 | } |
| 1032 | /* |
| 1033 | * Do not attempt hostkey update if a certificate was |
| 1034 | * successfully matched. |
| 1035 | */ |
| 1036 | if (options.update_hostkeys != 0) { |
| 1037 | options.update_hostkeys = 0; |
| 1038 | debug3_f("certificate host key in use; "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1039 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "certificate host key in use; " "disabling UpdateHostkeys") |
| 1039 | "disabling UpdateHostkeys")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1039 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "certificate host key in use; " "disabling UpdateHostkeys"); |
| 1040 | } |
| 1041 | } |
| 1042 | /* Turn off UpdateHostkeys if key was in system known_hosts */ |
| 1043 | if (options.update_hostkeys != 0 && |
| 1044 | (path_in_hostfiles(host_found->file, |
| 1045 | system_hostfiles, num_system_hostfiles) || |
| 1046 | (ip_status == HOST_OK && ip_found != NULL((void *)0) && |
| 1047 | path_in_hostfiles(ip_found->file, |
| 1048 | system_hostfiles, num_system_hostfiles)))) { |
| 1049 | options.update_hostkeys = 0; |
| 1050 | debug3_f("host key found in GlobalKnownHostsFile; "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1051 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "host key found in GlobalKnownHostsFile; " "disabling UpdateHostkeys") |
| 1051 | "disabling UpdateHostkeys")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1051 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "host key found in GlobalKnownHostsFile; " "disabling UpdateHostkeys"); |
| 1052 | } |
| 1053 | if (options.update_hostkeys != 0 && host_found->note) { |
| 1054 | options.update_hostkeys = 0; |
| 1055 | debug3_f("host key found via KnownHostsCommand; "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1056 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "host key found via KnownHostsCommand; " "disabling UpdateHostkeys") |
| 1056 | "disabling UpdateHostkeys")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1056 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "host key found via KnownHostsCommand; " "disabling UpdateHostkeys"); |
| 1057 | } |
| 1058 | if (options.check_host_ip && ip_status == HOST_NEW) { |
| 1059 | if (readonly || want_cert) |
| 1060 | logit("%s host key for IP address "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1062 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "%s host key for IP address " "'%.128s' not in list of known hosts.", type, ip) |
| 1061 | "'%.128s' not in list of known hosts.",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1062 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "%s host key for IP address " "'%.128s' not in list of known hosts.", type, ip) |
| 1062 | type, ip)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1062 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "%s host key for IP address " "'%.128s' not in list of known hosts.", type, ip); |
| 1063 | else if (!add_host_to_hostfile(user_hostfiles[0], ip, |
| 1064 | host_key, options.hash_known_hosts)) |
| 1065 | logit("Failed to add the %s host key for IP "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1068 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Failed to add the %s host key for IP " "address '%.128s' to the list of known " "hosts (%.500s).", type , ip, user_hostfiles[0]) |
| 1066 | "address '%.128s' to the list of known "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1068 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Failed to add the %s host key for IP " "address '%.128s' to the list of known " "hosts (%.500s).", type , ip, user_hostfiles[0]) |
| 1067 | "hosts (%.500s).", type, ip,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1068 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Failed to add the %s host key for IP " "address '%.128s' to the list of known " "hosts (%.500s).", type , ip, user_hostfiles[0]) |
| 1068 | user_hostfiles[0])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1068 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Failed to add the %s host key for IP " "address '%.128s' to the list of known " "hosts (%.500s).", type , ip, user_hostfiles[0]); |
| 1069 | else |
| 1070 | logit("Warning: Permanently added the %s host "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1072 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Warning: Permanently added the %s host " "key for IP address '%.128s' to the list " "of known hosts." , type, ip) |
| 1071 | "key for IP address '%.128s' to the list "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1072 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Warning: Permanently added the %s host " "key for IP address '%.128s' to the list " "of known hosts." , type, ip) |
| 1072 | "of known hosts.", type, ip)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1072 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Warning: Permanently added the %s host " "key for IP address '%.128s' to the list " "of known hosts." , type, ip); |
| 1073 | } else if (options.visual_host_key) { |
| 1074 | fp = sshkey_fingerprint(host_key, |
| 1075 | options.fingerprint_hash, SSH_FP_DEFAULT); |
| 1076 | ra = sshkey_fingerprint(host_key, |
| 1077 | options.fingerprint_hash, SSH_FP_RANDOMART); |
| 1078 | if (fp == NULL((void *)0) || ra == NULL((void *)0)) |
| 1079 | fatal_f("sshkey_fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 1079, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshkey_fingerprint failed" ); |
| 1080 | logit("Host key fingerprint is %s\n%s", fp, ra)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1080 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Host key fingerprint is %s\n%s" , fp, ra); |
| 1081 | free(ra); |
| 1082 | free(fp); |
| 1083 | } |
| 1084 | hostkey_trusted = 1; |
| 1085 | break; |
| 1086 | case HOST_NEW: |
| 1087 | if (options.host_key_alias == NULL((void *)0) && port != 0 && |
| 1088 | port != SSH_DEFAULT_PORT22 && !clobber_port) { |
| 1089 | debug("checking without port identifier")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1089 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "checking without port identifier" ); |
| 1090 | if (check_host_key(hostname, cinfo, hostaddr, 0, |
| 1091 | host_key, ROQUIET2, 1, |
| 1092 | user_hostfiles, num_user_hostfiles, |
| 1093 | system_hostfiles, num_system_hostfiles, |
| 1094 | hostfile_command) == 0) { |
| 1095 | debug("found matching key w/out port")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1095 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "found matching key w/out port" ); |
| 1096 | break; |
| 1097 | } |
| 1098 | } |
| 1099 | if (readonly || want_cert) |
| 1100 | goto fail; |
| 1101 | /* The host is new. */ |
| 1102 | if (options.strict_host_key_checking == |
| 1103 | SSH_STRICT_HOSTKEY_YES2) { |
| 1104 | /* |
| 1105 | * User has requested strict host key checking. We |
| 1106 | * will not add the host key automatically. The only |
| 1107 | * alternative left is to abort. |
| 1108 | */ |
| 1109 | error("No %s host key is known for %.200s and you "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1110 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "No %s host key is known for %.200s and you " "have requested strict checking.", type, host) |
| 1110 | "have requested strict checking.", type, host)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1110 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "No %s host key is known for %.200s and you " "have requested strict checking.", type, host); |
| 1111 | goto fail; |
| 1112 | } else if (options.strict_host_key_checking == |
| 1113 | SSH_STRICT_HOSTKEY_ASK3) { |
| 1114 | char *msg1 = NULL((void *)0), *msg2 = NULL((void *)0); |
| 1115 | |
| 1116 | xasprintf(&msg1, "The authenticity of host " |
| 1117 | "'%.200s (%s)' can't be established", host, ip); |
| 1118 | |
| 1119 | if (show_other_keys(host_hostkeys, host_key)) { |
| 1120 | xextendf(&msg1, "\n", "but keys of different " |
| 1121 | "type are already known for this host."); |
| 1122 | } else |
| 1123 | xextendf(&msg1, "", "."); |
| 1124 | |
| 1125 | fp = sshkey_fingerprint(host_key, |
| 1126 | options.fingerprint_hash, SSH_FP_DEFAULT); |
| 1127 | ra = sshkey_fingerprint(host_key, |
| 1128 | options.fingerprint_hash, SSH_FP_RANDOMART); |
| 1129 | if (fp == NULL((void *)0) || ra == NULL((void *)0)) |
| 1130 | fatal_f("sshkey_fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 1130, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshkey_fingerprint failed" ); |
| 1131 | xextendf(&msg1, "\n", "%s key fingerprint is %s.", |
| 1132 | type, fp); |
| 1133 | if (options.visual_host_key) |
| 1134 | xextendf(&msg1, "\n", "%s", ra); |
| 1135 | if (options.verify_host_key_dns) { |
| 1136 | xextendf(&msg1, "\n", |
| 1137 | "%s host key fingerprint found in DNS.", |
| 1138 | matching_host_key_dns ? |
| 1139 | "Matching" : "No matching"); |
| 1140 | } |
| 1141 | /* msg2 informs for other names matching this key */ |
| 1142 | if ((msg2 = other_hostkeys_message(host, ip, host_key, |
| 1143 | user_hostfiles, num_user_hostfiles, |
| 1144 | system_hostfiles, num_system_hostfiles)) != NULL((void *)0)) |
| 1145 | xextendf(&msg1, "\n", "%s", msg2); |
| 1146 | |
| 1147 | xextendf(&msg1, "\n", |
| 1148 | "Are you sure you want to continue connecting " |
| 1149 | "(yes/no/[fingerprint])? "); |
| 1150 | |
| 1151 | confirmed = confirm(msg1, fp); |
| 1152 | free(ra); |
| 1153 | free(fp); |
| 1154 | free(msg1); |
| 1155 | free(msg2); |
| 1156 | if (!confirmed) |
| 1157 | goto fail; |
| 1158 | hostkey_trusted = 1; /* user explicitly confirmed */ |
| 1159 | } |
| 1160 | /* |
| 1161 | * If in "new" or "off" strict mode, add the key automatically |
| 1162 | * to the local known_hosts file. |
| 1163 | */ |
| 1164 | if (options.check_host_ip && ip_status == HOST_NEW) { |
| 1165 | snprintf(hostline, sizeof(hostline), "%s,%s", host, ip); |
| 1166 | hostp = hostline; |
| 1167 | if (options.hash_known_hosts) { |
| 1168 | /* Add hash of host and IP separately */ |
| 1169 | r = add_host_to_hostfile(user_hostfiles[0], |
| 1170 | host, host_key, options.hash_known_hosts) && |
| 1171 | add_host_to_hostfile(user_hostfiles[0], ip, |
| 1172 | host_key, options.hash_known_hosts); |
| 1173 | } else { |
| 1174 | /* Add unhashed "host,ip" */ |
| 1175 | r = add_host_to_hostfile(user_hostfiles[0], |
| 1176 | hostline, host_key, |
| 1177 | options.hash_known_hosts); |
| 1178 | } |
| 1179 | } else { |
| 1180 | r = add_host_to_hostfile(user_hostfiles[0], host, |
| 1181 | host_key, options.hash_known_hosts); |
| 1182 | hostp = host; |
| 1183 | } |
| 1184 | |
| 1185 | if (!r) |
| 1186 | logit("Failed to add the host to the list of known "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1187 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Failed to add the host to the list of known " "hosts (%.500s).", user_hostfiles[0]) |
| 1187 | "hosts (%.500s).", user_hostfiles[0])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1187 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Failed to add the host to the list of known " "hosts (%.500s).", user_hostfiles[0]); |
| 1188 | else |
| 1189 | logit("Warning: Permanently added '%.200s' (%s) to the "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1190 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Warning: Permanently added '%.200s' (%s) to the " "list of known hosts.", hostp, type) |
| 1190 | "list of known hosts.", hostp, type)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1190 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Warning: Permanently added '%.200s' (%s) to the " "list of known hosts.", hostp, type); |
| 1191 | break; |
| 1192 | case HOST_REVOKED: |
| 1193 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1193 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@" ); |
| 1194 | error("@ WARNING: REVOKED HOST KEY DETECTED! @")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1194 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "@ WARNING: REVOKED HOST KEY DETECTED! @" ); |
| 1195 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1195 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@" ); |
| 1196 | error("The %s host key for %s is marked as revoked.", type, host)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1196 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "The %s host key for %s is marked as revoked." , type, host); |
| 1197 | error("This could mean that a stolen key is being used to")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1197 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "This could mean that a stolen key is being used to" ); |
| 1198 | error("impersonate this host.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1198 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "impersonate this host." ); |
| 1199 | |
| 1200 | /* |
| 1201 | * If strict host key checking is in use, the user will have |
| 1202 | * to edit the key manually and we can only abort. |
| 1203 | */ |
| 1204 | if (options.strict_host_key_checking != |
| 1205 | SSH_STRICT_HOSTKEY_OFF0) { |
| 1206 | error("%s host key for %.200s was revoked and you have "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1207 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%s host key for %.200s was revoked and you have " "requested strict checking.", type, host) |
| 1207 | "requested strict checking.", type, host)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1207 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%s host key for %.200s was revoked and you have " "requested strict checking.", type, host); |
| 1208 | goto fail; |
| 1209 | } |
| 1210 | goto continue_unsafe; |
| 1211 | |
| 1212 | case HOST_CHANGED: |
| 1213 | if (want_cert) { |
| 1214 | /* |
| 1215 | * This is only a debug() since it is valid to have |
| 1216 | * CAs with wildcard DNS matches that don't match |
| 1217 | * all hosts that one might visit. |
| 1218 | */ |
| 1219 | debug("Host certificate authority does not "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1221 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Host certificate authority does not " "match %s in %s:%lu", "@cert-authority", host_found->file , host_found->line) |
| 1220 | "match %s in %s:%lu", CA_MARKER,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1221 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Host certificate authority does not " "match %s in %s:%lu", "@cert-authority", host_found->file , host_found->line) |
| 1221 | host_found->file, host_found->line)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1221 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Host certificate authority does not " "match %s in %s:%lu", "@cert-authority", host_found->file , host_found->line); |
| 1222 | goto fail; |
| 1223 | } |
| 1224 | if (readonly == ROQUIET2) |
| 1225 | goto fail; |
| 1226 | if (options.check_host_ip && host_ip_differ) { |
| 1227 | char *key_msg; |
| 1228 | if (ip_status == HOST_NEW) |
| 1229 | key_msg = "is unknown"; |
| 1230 | else if (ip_status == HOST_OK) |
| 1231 | key_msg = "is unchanged"; |
| 1232 | else |
| 1233 | key_msg = "has a different value"; |
| 1234 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1234 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@" ); |
| 1235 | error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1235 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @" ); |
| 1236 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1236 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@" ); |
| 1237 | error("The %s host key for %s has changed,", type, host)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1237 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "The %s host key for %s has changed," , type, host); |
| 1238 | error("and the key for the corresponding IP address %s", ip)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1238 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "and the key for the corresponding IP address %s" , ip); |
| 1239 | error("%s. This could either mean that", key_msg)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1239 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%s. This could either mean that" , key_msg); |
| 1240 | error("DNS SPOOFING is happening or the IP address for the host")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1240 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "DNS SPOOFING is happening or the IP address for the host" ); |
| 1241 | error("and its host key have changed at the same time.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1241 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "and its host key have changed at the same time." ); |
| 1242 | if (ip_status != HOST_NEW) |
| 1243 | error("Offending key for IP in %s:%lu",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1244 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Offending key for IP in %s:%lu" , ip_found->file, ip_found->line) |
| 1244 | ip_found->file, ip_found->line)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1244 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Offending key for IP in %s:%lu" , ip_found->file, ip_found->line); |
| 1245 | } |
| 1246 | /* The host key has changed. */ |
| 1247 | warn_changed_key(host_key); |
| 1248 | if (num_user_hostfiles > 0 || num_system_hostfiles > 0) { |
| 1249 | error("Add correct host key in %.100s to get rid "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1251 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Add correct host key in %.100s to get rid " "of this message.", num_user_hostfiles > 0 ? user_hostfiles [0] : system_hostfiles[0]) |
| 1250 | "of this message.", num_user_hostfiles > 0 ?sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1251 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Add correct host key in %.100s to get rid " "of this message.", num_user_hostfiles > 0 ? user_hostfiles [0] : system_hostfiles[0]) |
| 1251 | user_hostfiles[0] : system_hostfiles[0])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1251 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Add correct host key in %.100s to get rid " "of this message.", num_user_hostfiles > 0 ? user_hostfiles [0] : system_hostfiles[0]); |
| 1252 | } |
| 1253 | error("Offending %s key in %s:%lu",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1255 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Offending %s key in %s:%lu" , sshkey_type(host_found->key), host_found->file, host_found ->line) |
| 1254 | sshkey_type(host_found->key),sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1255 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Offending %s key in %s:%lu" , sshkey_type(host_found->key), host_found->file, host_found ->line) |
| 1255 | host_found->file, host_found->line)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1255 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Offending %s key in %s:%lu" , sshkey_type(host_found->key), host_found->file, host_found ->line); |
| 1256 | |
| 1257 | /* |
| 1258 | * If strict host key checking is in use, the user will have |
| 1259 | * to edit the key manually and we can only abort. |
| 1260 | */ |
| 1261 | if (options.strict_host_key_checking != |
| 1262 | SSH_STRICT_HOSTKEY_OFF0) { |
| 1263 | error("Host key for %.200s has changed and you have "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1264 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Host key for %.200s has changed and you have " "requested strict checking.", host) |
| 1264 | "requested strict checking.", host)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1264 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Host key for %.200s has changed and you have " "requested strict checking.", host); |
| 1265 | goto fail; |
| 1266 | } |
| 1267 | |
| 1268 | continue_unsafe: |
| 1269 | /* |
| 1270 | * If strict host key checking has not been requested, allow |
| 1271 | * the connection but without MITM-able authentication or |
| 1272 | * forwarding. |
| 1273 | */ |
| 1274 | if (options.password_authentication) { |
| 1275 | error("Password authentication is disabled to avoid "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1276 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Password authentication is disabled to avoid " "man-in-the-middle attacks.") |
| 1276 | "man-in-the-middle attacks.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1276 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Password authentication is disabled to avoid " "man-in-the-middle attacks."); |
| 1277 | options.password_authentication = 0; |
| 1278 | cancelled_forwarding = 1; |
| 1279 | } |
| 1280 | if (options.kbd_interactive_authentication) { |
| 1281 | error("Keyboard-interactive authentication is disabled"sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1282 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Keyboard-interactive authentication is disabled" " to avoid man-in-the-middle attacks.") |
| 1282 | " to avoid man-in-the-middle attacks.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1282 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Keyboard-interactive authentication is disabled" " to avoid man-in-the-middle attacks."); |
| 1283 | options.kbd_interactive_authentication = 0; |
| 1284 | cancelled_forwarding = 1; |
| 1285 | } |
| 1286 | if (options.forward_agent) { |
| 1287 | error("Agent forwarding is disabled to avoid "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1288 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Agent forwarding is disabled to avoid " "man-in-the-middle attacks.") |
| 1288 | "man-in-the-middle attacks.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1288 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Agent forwarding is disabled to avoid " "man-in-the-middle attacks."); |
| 1289 | options.forward_agent = 0; |
| 1290 | cancelled_forwarding = 1; |
| 1291 | } |
| 1292 | if (options.forward_x11) { |
| 1293 | error("X11 forwarding is disabled to avoid "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1294 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "X11 forwarding is disabled to avoid " "man-in-the-middle attacks.") |
| 1294 | "man-in-the-middle attacks.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1294 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "X11 forwarding is disabled to avoid " "man-in-the-middle attacks."); |
| 1295 | options.forward_x11 = 0; |
| 1296 | cancelled_forwarding = 1; |
| 1297 | } |
| 1298 | if (options.num_local_forwards > 0 || |
| 1299 | options.num_remote_forwards > 0) { |
| 1300 | error("Port forwarding is disabled to avoid "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1301 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Port forwarding is disabled to avoid " "man-in-the-middle attacks.") |
| 1301 | "man-in-the-middle attacks.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1301 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Port forwarding is disabled to avoid " "man-in-the-middle attacks."); |
| 1302 | options.num_local_forwards = |
| 1303 | options.num_remote_forwards = 0; |
| 1304 | cancelled_forwarding = 1; |
| 1305 | } |
| 1306 | if (options.tun_open != SSH_TUNMODE_NO0x00) { |
| 1307 | error("Tunnel forwarding is disabled to avoid "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1308 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Tunnel forwarding is disabled to avoid " "man-in-the-middle attacks.") |
| 1308 | "man-in-the-middle attacks.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1308 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Tunnel forwarding is disabled to avoid " "man-in-the-middle attacks."); |
| 1309 | options.tun_open = SSH_TUNMODE_NO0x00; |
| 1310 | cancelled_forwarding = 1; |
| 1311 | } |
| 1312 | if (options.update_hostkeys != 0) { |
| 1313 | error("UpdateHostkeys is disabled because the host "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1314 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "UpdateHostkeys is disabled because the host " "key is not trusted.") |
| 1314 | "key is not trusted.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1314 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "UpdateHostkeys is disabled because the host " "key is not trusted."); |
| 1315 | options.update_hostkeys = 0; |
| 1316 | } |
| 1317 | if (options.exit_on_forward_failure && cancelled_forwarding) |
| 1318 | fatal("Error: forwarding disabled due to host key "sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 1319, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Error: forwarding disabled due to host key " "check failure") |
| 1319 | "check failure")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 1319, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Error: forwarding disabled due to host key " "check failure"); |
| 1320 | |
| 1321 | /* |
| 1322 | * XXX Should permit the user to change to use the new id. |
| 1323 | * This could be done by converting the host key to an |
| 1324 | * identifying sentence, tell that the host identifies itself |
| 1325 | * by that sentence, and ask the user if they wish to |
| 1326 | * accept the authentication. |
| 1327 | */ |
| 1328 | break; |
| 1329 | case HOST_FOUND: |
| 1330 | fatal("internal error")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 1330, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "internal error"); |
| 1331 | break; |
| 1332 | } |
| 1333 | |
| 1334 | if (options.check_host_ip && host_status != HOST_CHANGED && |
| 1335 | ip_status == HOST_CHANGED) { |
| 1336 | snprintf(msg, sizeof(msg), |
| 1337 | "Warning: the %s host key for '%.200s' " |
| 1338 | "differs from the key for the IP address '%.128s'" |
| 1339 | "\nOffending key for IP in %s:%lu", |
| 1340 | type, host, ip, ip_found->file, ip_found->line); |
| 1341 | if (host_status == HOST_OK) { |
| 1342 | len = strlen(msg); |
| 1343 | snprintf(msg + len, sizeof(msg) - len, |
| 1344 | "\nMatching host key in %s:%lu", |
| 1345 | host_found->file, host_found->line); |
| 1346 | } |
| 1347 | if (options.strict_host_key_checking == |
| 1348 | SSH_STRICT_HOSTKEY_ASK3) { |
| 1349 | strlcat(msg, "\nAre you sure you want " |
| 1350 | "to continue connecting (yes/no)? ", sizeof(msg)); |
| 1351 | if (!confirm(msg, NULL((void *)0))) |
| 1352 | goto fail; |
| 1353 | } else if (options.strict_host_key_checking != |
| 1354 | SSH_STRICT_HOSTKEY_OFF0) { |
| 1355 | logit("%s", msg)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1355 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "%s", msg); |
| 1356 | error("Exiting, you have requested strict checking.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1356 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Exiting, you have requested strict checking." ); |
| 1357 | goto fail; |
| 1358 | } else { |
| 1359 | logit("%s", msg)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1359 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "%s", msg); |
| 1360 | } |
| 1361 | } |
| 1362 | |
| 1363 | if (!hostkey_trusted && options.update_hostkeys) { |
| 1364 | debug_f("hostkey not known or explicitly trusted: "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1365 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "hostkey not known or explicitly trusted: " "disabling UpdateHostkeys") |
| 1365 | "disabling UpdateHostkeys")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1365 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "hostkey not known or explicitly trusted: " "disabling UpdateHostkeys"); |
| 1366 | options.update_hostkeys = 0; |
| 1367 | } |
| 1368 | |
| 1369 | free(ip); |
| 1370 | free(host); |
| 1371 | if (host_hostkeys != NULL((void *)0)) |
| 1372 | free_hostkeys(host_hostkeys); |
| 1373 | if (ip_hostkeys != NULL((void *)0)) |
| 1374 | free_hostkeys(ip_hostkeys); |
| 1375 | return 0; |
| 1376 | |
| 1377 | fail: |
| 1378 | if (want_cert && host_status != HOST_REVOKED) { |
| 1379 | /* |
| 1380 | * No matching certificate. Downgrade cert to raw key and |
| 1381 | * search normally. |
| 1382 | */ |
| 1383 | debug("No matching CA found. Retry with plain key")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1383 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "No matching CA found. Retry with plain key" ); |
| 1384 | if ((r = sshkey_from_private(host_key, &raw_key)) != 0) |
| 1385 | fatal_fr(r, "decode key")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 1385, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "decode key"); |
| 1386 | if ((r = sshkey_drop_cert(raw_key)) != 0) |
| 1387 | fatal_r(r, "Couldn't drop certificate")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 1387, 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "Couldn't drop certificate" ); |
| 1388 | host_key = raw_key; |
| 1389 | goto retry; |
| 1390 | } |
| 1391 | sshkey_free(raw_key); |
| 1392 | free(ip); |
| 1393 | free(host); |
| 1394 | if (host_hostkeys != NULL((void *)0)) |
| 1395 | free_hostkeys(host_hostkeys); |
| 1396 | if (ip_hostkeys != NULL((void *)0)) |
| 1397 | free_hostkeys(ip_hostkeys); |
| 1398 | return -1; |
| 1399 | } |
| 1400 | |
| 1401 | /* returns 0 if key verifies or -1 if key does NOT verify */ |
| 1402 | int |
| 1403 | verify_host_key(char *host, struct sockaddr *hostaddr, struct sshkey *host_key, |
| 1404 | const struct ssh_conn_info *cinfo) |
| 1405 | { |
| 1406 | u_int i; |
| 1407 | int r = -1, flags = 0; |
| 1408 | char valid[64], *fp = NULL((void *)0), *cafp = NULL((void *)0); |
| 1409 | struct sshkey *plain = NULL((void *)0); |
| 1410 | |
| 1411 | if ((fp = sshkey_fingerprint(host_key, |
| 1412 | options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL((void *)0)) { |
| 1413 | error_fr(r, "fingerprint host key")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1413 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "fingerprint host key"); |
| 1414 | r = -1; |
| 1415 | goto out; |
| 1416 | } |
| 1417 | |
| 1418 | if (sshkey_is_cert(host_key)) { |
| 1419 | if ((cafp = sshkey_fingerprint(host_key->cert->signature_key, |
| 1420 | options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL((void *)0)) { |
| 1421 | error_fr(r, "fingerprint CA key")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1421 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "fingerprint CA key"); |
| 1422 | r = -1; |
| 1423 | goto out; |
| 1424 | } |
| 1425 | sshkey_format_cert_validity(host_key->cert, |
| 1426 | valid, sizeof(valid)); |
| 1427 | debug("Server host certificate: %s %s, serial %llu "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1433 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Server host certificate: %s %s, serial %llu " "ID \"%s\" CA %s %s valid %s", sshkey_ssh_name(host_key), fp , (unsigned long long)host_key->cert->serial, host_key-> cert->key_id, sshkey_ssh_name(host_key->cert->signature_key ), cafp, valid) |
| 1428 | "ID \"%s\" CA %s %s valid %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1433 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Server host certificate: %s %s, serial %llu " "ID \"%s\" CA %s %s valid %s", sshkey_ssh_name(host_key), fp , (unsigned long long)host_key->cert->serial, host_key-> cert->key_id, sshkey_ssh_name(host_key->cert->signature_key ), cafp, valid) |
| 1429 | sshkey_ssh_name(host_key), fp,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1433 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Server host certificate: %s %s, serial %llu " "ID \"%s\" CA %s %s valid %s", sshkey_ssh_name(host_key), fp , (unsigned long long)host_key->cert->serial, host_key-> cert->key_id, sshkey_ssh_name(host_key->cert->signature_key ), cafp, valid) |
| 1430 | (unsigned long long)host_key->cert->serial,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1433 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Server host certificate: %s %s, serial %llu " "ID \"%s\" CA %s %s valid %s", sshkey_ssh_name(host_key), fp , (unsigned long long)host_key->cert->serial, host_key-> cert->key_id, sshkey_ssh_name(host_key->cert->signature_key ), cafp, valid) |
| 1431 | host_key->cert->key_id,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1433 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Server host certificate: %s %s, serial %llu " "ID \"%s\" CA %s %s valid %s", sshkey_ssh_name(host_key), fp , (unsigned long long)host_key->cert->serial, host_key-> cert->key_id, sshkey_ssh_name(host_key->cert->signature_key ), cafp, valid) |
| 1432 | sshkey_ssh_name(host_key->cert->signature_key), cafp,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1433 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Server host certificate: %s %s, serial %llu " "ID \"%s\" CA %s %s valid %s", sshkey_ssh_name(host_key), fp , (unsigned long long)host_key->cert->serial, host_key-> cert->key_id, sshkey_ssh_name(host_key->cert->signature_key ), cafp, valid) |
| 1433 | valid)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1433 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Server host certificate: %s %s, serial %llu " "ID \"%s\" CA %s %s valid %s", sshkey_ssh_name(host_key), fp , (unsigned long long)host_key->cert->serial, host_key-> cert->key_id, sshkey_ssh_name(host_key->cert->signature_key ), cafp, valid); |
| 1434 | for (i = 0; i < host_key->cert->nprincipals; i++) { |
| 1435 | debug2("Server host certificate hostname: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1436 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "Server host certificate hostname: %s" , host_key->cert->principals[i]) |
| 1436 | host_key->cert->principals[i])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1436 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "Server host certificate hostname: %s" , host_key->cert->principals[i]); |
| 1437 | } |
| 1438 | } else { |
| 1439 | debug("Server host key: %s %s", sshkey_ssh_name(host_key), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1439 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Server host key: %s %s" , sshkey_ssh_name(host_key), fp); |
| 1440 | } |
| 1441 | |
| 1442 | if (sshkey_equal(previous_host_key, host_key)) { |
| 1443 | debug2_f("server host key %s %s matches cached key",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1444 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "server host key %s %s matches cached key" , sshkey_type(host_key), fp) |
| 1444 | sshkey_type(host_key), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1444 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "server host key %s %s matches cached key" , sshkey_type(host_key), fp); |
| 1445 | r = 0; |
| 1446 | goto out; |
| 1447 | } |
| 1448 | |
| 1449 | /* Check in RevokedHostKeys file if specified */ |
| 1450 | if (options.revoked_host_keys != NULL((void *)0)) { |
| 1451 | r = sshkey_check_revoked(host_key, options.revoked_host_keys); |
| 1452 | switch (r) { |
| 1453 | case 0: |
| 1454 | break; /* not revoked */ |
| 1455 | case SSH_ERR_KEY_REVOKED-51: |
| 1456 | error("Host key %s %s revoked by file %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1458 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Host key %s %s revoked by file %s" , sshkey_type(host_key), fp, options.revoked_host_keys) |
| 1457 | sshkey_type(host_key), fp,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1458 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Host key %s %s revoked by file %s" , sshkey_type(host_key), fp, options.revoked_host_keys) |
| 1458 | options.revoked_host_keys)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1458 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Host key %s %s revoked by file %s" , sshkey_type(host_key), fp, options.revoked_host_keys); |
| 1459 | r = -1; |
| 1460 | goto out; |
| 1461 | default: |
| 1462 | error_r(r, "Error checking host key %s %s in "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1464 , 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Error checking host key %s %s in " "revoked keys file %s", sshkey_type(host_key), fp, options.revoked_host_keys ) |
| 1463 | "revoked keys file %s", sshkey_type(host_key),sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1464 , 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Error checking host key %s %s in " "revoked keys file %s", sshkey_type(host_key), fp, options.revoked_host_keys ) |
| 1464 | fp, options.revoked_host_keys)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1464 , 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Error checking host key %s %s in " "revoked keys file %s", sshkey_type(host_key), fp, options.revoked_host_keys ); |
| 1465 | r = -1; |
| 1466 | goto out; |
| 1467 | } |
| 1468 | } |
| 1469 | |
| 1470 | if (options.verify_host_key_dns) { |
| 1471 | /* |
| 1472 | * XXX certs are not yet supported for DNS, so downgrade |
| 1473 | * them and try the plain key. |
| 1474 | */ |
| 1475 | if ((r = sshkey_from_private(host_key, &plain)) != 0) |
| 1476 | goto out; |
| 1477 | if (sshkey_is_cert(plain)) |
| 1478 | sshkey_drop_cert(plain); |
| 1479 | if (verify_host_key_dns(host, hostaddr, plain, &flags) == 0) { |
| 1480 | if (flags & DNS_VERIFY_FOUND0x00000001) { |
| 1481 | if (options.verify_host_key_dns == 1 && |
| 1482 | flags & DNS_VERIFY_MATCH0x00000002 && |
| 1483 | flags & DNS_VERIFY_SECURE0x00000004) { |
| 1484 | r = 0; |
| 1485 | goto out; |
| 1486 | } |
| 1487 | if (flags & DNS_VERIFY_MATCH0x00000002) { |
| 1488 | matching_host_key_dns = 1; |
| 1489 | } else { |
| 1490 | warn_changed_key(plain); |
| 1491 | error("Update the SSHFP RR in DNS "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1493 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Update the SSHFP RR in DNS " "with the new host key to get rid " "of this message.") |
| 1492 | "with the new host key to get rid "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1493 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Update the SSHFP RR in DNS " "with the new host key to get rid " "of this message.") |
| 1493 | "of this message.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1493 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Update the SSHFP RR in DNS " "with the new host key to get rid " "of this message."); |
| 1494 | } |
| 1495 | } |
| 1496 | } |
| 1497 | } |
| 1498 | r = check_host_key(host, cinfo, hostaddr, options.port, host_key, |
| 1499 | RDRW0, 0, options.user_hostfiles, options.num_user_hostfiles, |
| 1500 | options.system_hostfiles, options.num_system_hostfiles, |
| 1501 | options.known_hosts_command); |
| 1502 | |
| 1503 | out: |
| 1504 | sshkey_free(plain); |
| 1505 | free(fp); |
| 1506 | free(cafp); |
| 1507 | if (r == 0 && host_key != NULL((void *)0)) { |
| 1508 | sshkey_free(previous_host_key); |
| 1509 | r = sshkey_from_private(host_key, &previous_host_key); |
| 1510 | } |
| 1511 | |
| 1512 | return r; |
| 1513 | } |
| 1514 | |
| 1515 | /* |
| 1516 | * Starts a dialog with the server, and authenticates the current user on the |
| 1517 | * server. This does not need any extra privileges. The basic connection |
| 1518 | * to the server must already have been established before this is called. |
| 1519 | * If login fails, this function prints an error and never returns. |
| 1520 | * This function does not require super-user privileges. |
| 1521 | */ |
| 1522 | void |
| 1523 | ssh_login(struct ssh *ssh, Sensitive *sensitive, const char *orighost, |
| 1524 | struct sockaddr *hostaddr, u_short port, struct passwd *pw, int timeout_ms, |
| 1525 | const struct ssh_conn_info *cinfo) |
| 1526 | { |
| 1527 | char *host; |
| 1528 | char *server_user, *local_user; |
| 1529 | int r; |
| 1530 | |
| 1531 | local_user = xstrdup(pw->pw_name); |
| 1532 | server_user = options.user ? options.user : local_user; |
| 1533 | |
| 1534 | /* Convert the user-supplied hostname into all lowercase. */ |
| 1535 | host = xstrdup(orighost); |
| 1536 | lowercase(host); |
| 1537 | |
| 1538 | /* Exchange protocol version identification strings with the server. */ |
| 1539 | if ((r = kex_exchange_identification(ssh, timeout_ms, NULL((void *)0))) != 0) |
| 1540 | sshpkt_fatal(ssh, r, "banner exchange"); |
| 1541 | |
| 1542 | /* Put the connection into non-blocking mode. */ |
| 1543 | ssh_packet_set_nonblocking(ssh); |
| 1544 | |
| 1545 | /* key exchange */ |
| 1546 | /* authenticate user */ |
| 1547 | debug("Authenticating to %s:%d as '%s'", host, port, server_user)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1547 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Authenticating to %s:%d as '%s'" , host, port, server_user); |
| 1548 | ssh_kex2(ssh, host, hostaddr, port, cinfo); |
| 1549 | ssh_userauth2(ssh, local_user, server_user, host, sensitive); |
| 1550 | free(local_user); |
| 1551 | free(host); |
| 1552 | } |
| 1553 | |
| 1554 | /* print all known host keys for a given host, but skip keys of given type */ |
| 1555 | static int |
| 1556 | show_other_keys(struct hostkeys *hostkeys, struct sshkey *key) |
| 1557 | { |
| 1558 | int type[] = { |
| 1559 | KEY_RSA, |
| 1560 | #ifdef WITH_DSA1 |
| 1561 | KEY_DSA, |
| 1562 | #endif |
| 1563 | KEY_ECDSA, |
| 1564 | KEY_ED25519, |
| 1565 | KEY_XMSS, |
| 1566 | -1 |
| 1567 | }; |
| 1568 | int i, ret = 0; |
| 1569 | char *fp, *ra; |
| 1570 | const struct hostkey_entry *found; |
| 1571 | |
| 1572 | for (i = 0; type[i] != -1; i++) { |
| 1573 | if (type[i] == key->type) |
| 1574 | continue; |
| 1575 | if (!lookup_key_in_hostkeys_by_type(hostkeys, type[i], |
| 1576 | -1, &found)) |
| 1577 | continue; |
| 1578 | fp = sshkey_fingerprint(found->key, |
| 1579 | options.fingerprint_hash, SSH_FP_DEFAULT); |
| 1580 | ra = sshkey_fingerprint(found->key, |
| 1581 | options.fingerprint_hash, SSH_FP_RANDOMART); |
| 1582 | if (fp == NULL((void *)0) || ra == NULL((void *)0)) |
| 1583 | fatal_f("sshkey_fingerprint fail")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 1583, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshkey_fingerprint fail" ); |
| 1584 | logit("WARNING: %s key found for host %s\n"sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1589 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "WARNING: %s key found for host %s\n" "in %s:%lu\n" "%s key fingerprint %s.", sshkey_type(found-> key), found->host, found->file, found->line, sshkey_type (found->key), fp) |
| 1585 | "in %s:%lu\n"sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1589 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "WARNING: %s key found for host %s\n" "in %s:%lu\n" "%s key fingerprint %s.", sshkey_type(found-> key), found->host, found->file, found->line, sshkey_type (found->key), fp) |
| 1586 | "%s key fingerprint %s.",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1589 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "WARNING: %s key found for host %s\n" "in %s:%lu\n" "%s key fingerprint %s.", sshkey_type(found-> key), found->host, found->file, found->line, sshkey_type (found->key), fp) |
| 1587 | sshkey_type(found->key),sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1589 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "WARNING: %s key found for host %s\n" "in %s:%lu\n" "%s key fingerprint %s.", sshkey_type(found-> key), found->host, found->file, found->line, sshkey_type (found->key), fp) |
| 1588 | found->host, found->file, found->line,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1589 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "WARNING: %s key found for host %s\n" "in %s:%lu\n" "%s key fingerprint %s.", sshkey_type(found-> key), found->host, found->file, found->line, sshkey_type (found->key), fp) |
| 1589 | sshkey_type(found->key), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1589 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "WARNING: %s key found for host %s\n" "in %s:%lu\n" "%s key fingerprint %s.", sshkey_type(found-> key), found->host, found->file, found->line, sshkey_type (found->key), fp); |
| 1590 | if (options.visual_host_key) |
| 1591 | logit("%s", ra)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1591 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "%s", ra); |
| 1592 | free(ra); |
| 1593 | free(fp); |
| 1594 | ret = 1; |
| 1595 | } |
| 1596 | return ret; |
| 1597 | } |
| 1598 | |
| 1599 | static void |
| 1600 | warn_changed_key(struct sshkey *host_key) |
| 1601 | { |
| 1602 | char *fp; |
| 1603 | |
| 1604 | fp = sshkey_fingerprint(host_key, options.fingerprint_hash, |
| 1605 | SSH_FP_DEFAULT); |
| 1606 | if (fp == NULL((void *)0)) |
| 1607 | fatal_f("sshkey_fingerprint fail")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 1607, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshkey_fingerprint fail" ); |
| 1608 | |
| 1609 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1609 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@" ); |
| 1610 | error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1610 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @" ); |
| 1611 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1611 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@" ); |
| 1612 | error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1612 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!" ); |
| 1613 | error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1613 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Someone could be eavesdropping on you right now (man-in-the-middle attack)!" ); |
| 1614 | error("It is also possible that a host key has just been changed.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1614 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "It is also possible that a host key has just been changed." ); |
| 1615 | error("The fingerprint for the %s key sent by the remote host is\n%s.",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1616 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "The fingerprint for the %s key sent by the remote host is\n%s." , sshkey_type(host_key), fp) |
| 1616 | sshkey_type(host_key), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1616 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "The fingerprint for the %s key sent by the remote host is\n%s." , sshkey_type(host_key), fp); |
| 1617 | error("Please contact your system administrator.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1617 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Please contact your system administrator." ); |
| 1618 | |
| 1619 | free(fp); |
| 1620 | } |
| 1621 | |
| 1622 | /* |
| 1623 | * Execute a local command |
| 1624 | */ |
| 1625 | int |
| 1626 | ssh_local_cmd(const char *args) |
| 1627 | { |
| 1628 | char *shell; |
| 1629 | pid_t pid; |
| 1630 | int status; |
| 1631 | void (*osighand)(int); |
| 1632 | |
| 1633 | if (!options.permit_local_command || |
| 1634 | args == NULL((void *)0) || !*args) |
| 1635 | return (1); |
| 1636 | |
| 1637 | if ((shell = getenv("SHELL")) == NULL((void *)0) || *shell == '\0') |
| 1638 | shell = _PATH_BSHELL"/bin/sh"; |
| 1639 | |
| 1640 | osighand = ssh_signal(SIGCHLD20, SIG_DFL(void (*)(int))0); |
| 1641 | pid = fork(); |
| 1642 | if (pid == 0) { |
| 1643 | ssh_signal(SIGPIPE13, SIG_DFL(void (*)(int))0); |
| 1644 | debug3("Executing %s -c \"%s\"", shell, args)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1644 , 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "Executing %s -c \"%s\"" , shell, args); |
| 1645 | execl(shell, shell, "-c", args, (char *)NULL((void *)0)); |
| 1646 | error("Couldn't execute %s -c \"%s\": %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1647 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Couldn't execute %s -c \"%s\": %s" , shell, args, strerror((*__errno()))) |
| 1647 | shell, args, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1647 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Couldn't execute %s -c \"%s\": %s" , shell, args, strerror((*__errno()))); |
| 1648 | _exit(1); |
| 1649 | } else if (pid == -1) |
| 1650 | fatal("fork failed: %.100s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 1650, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "fork failed: %.100s" , strerror((*__errno()))); |
| 1651 | while (waitpid(pid, &status, 0) == -1) |
| 1652 | if (errno(*__errno()) != EINTR4) |
| 1653 | fatal("Couldn't wait for child: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__ , 1653, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Couldn't wait for child: %s" , strerror((*__errno()))); |
| 1654 | ssh_signal(SIGCHLD20, osighand); |
| 1655 | |
| 1656 | if (!WIFEXITED(status)(((status) & 0177) == 0)) |
| 1657 | return (1); |
| 1658 | |
| 1659 | return (WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff)); |
| 1660 | } |
| 1661 | |
| 1662 | void |
| 1663 | maybe_add_key_to_agent(const char *authfile, struct sshkey *private, |
| 1664 | const char *comment, const char *passphrase) |
| 1665 | { |
| 1666 | int auth_sock = -1, r; |
| 1667 | const char *skprovider = NULL((void *)0); |
| 1668 | |
| 1669 | if (options.add_keys_to_agent == 0) |
| 1670 | return; |
| 1671 | |
| 1672 | if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) { |
Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r' | |
| 1673 | debug3("no authentication agent, not adding key")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1673 , 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "no authentication agent, not adding key" ); |
| 1674 | return; |
| 1675 | } |
| 1676 | |
| 1677 | if (options.add_keys_to_agent == 2 && |
| 1678 | !ask_permission("Add key %s (%s) to agent?", authfile, comment)) { |
| 1679 | debug3("user denied adding this key")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1679 , 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "user denied adding this key" ); |
| 1680 | close(auth_sock); |
| 1681 | return; |
| 1682 | } |
| 1683 | if (sshkey_is_sk(private)) |
| 1684 | skprovider = options.sk_provider; |
| 1685 | if ((r = ssh_add_identity_constrained(auth_sock, private, |
| 1686 | comment == NULL((void *)0) ? authfile : comment, |
| 1687 | options.add_keys_to_agent_lifespan, |
| 1688 | (options.add_keys_to_agent == 3), 0, skprovider, NULL((void *)0), 0)) == 0) |
| 1689 | debug("identity added to agent: %s", authfile)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1689 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "identity added to agent: %s" , authfile); |
| 1690 | else |
| 1691 | debug("could not add identity to agent: %s (%d)", authfile, r)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect.c", __func__, 1691 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "could not add identity to agent: %s (%d)" , authfile, r); |
| 1692 | close(auth_sock); |
| 1693 | } |