Annotation of src/usr.bin/ssh/sshconnect.c, Revision 1.350
1.350 ! djm 1: /* $OpenBSD: sshconnect.c,v 1.349 2020/12/22 00:15:23 djm Exp $ */
1.1 deraadt 2: /*
1.39 deraadt 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.
1.78 deraadt 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".
1.39 deraadt 14: */
1.1 deraadt 15:
1.174 stevesk 16: #include <sys/types.h>
17: #include <sys/wait.h>
1.175 stevesk 18: #include <sys/stat.h>
1.187 stevesk 19: #include <sys/socket.h>
1.195 stevesk 20: #include <sys/time.h>
1.187 stevesk 21:
1.295 djm 22: #include <net/if.h>
1.187 stevesk 23: #include <netinet/in.h>
1.172 stevesk 24:
1.176 stevesk 25: #include <ctype.h>
1.190 stevesk 26: #include <errno.h>
1.216 dtucker 27: #include <fcntl.h>
1.191 stevesk 28: #include <netdb.h>
1.345 djm 29: #include <limits.h>
1.172 stevesk 30: #include <paths.h>
1.199 deraadt 31: #include <signal.h>
1.188 stevesk 32: #include <pwd.h>
1.198 stevesk 33: #include <stdio.h>
1.196 stevesk 34: #include <stdlib.h>
1.323 deraadt 35: #include <stdarg.h>
1.193 stevesk 36: #include <string.h>
1.192 stevesk 37: #include <unistd.h>
1.295 djm 38: #include <ifaddrs.h>
1.71 markus 39:
1.199 deraadt 40: #include "xmalloc.h"
1.91 markus 41: #include "ssh.h"
1.299 markus 42: #include "sshbuf.h"
1.1 deraadt 43: #include "packet.h"
1.21 markus 44: #include "compat.h"
1.300 markus 45: #include "sshkey.h"
1.71 markus 46: #include "sshconnect.h"
1.58 markus 47: #include "hostfile.h"
1.91 markus 48: #include "log.h"
1.251 millert 49: #include "misc.h"
1.91 markus 50: #include "readconf.h"
51: #include "atomicio.h"
1.140 jakob 52: #include "dns.h"
1.239 djm 53: #include "monitor_fdpass.h"
1.219 djm 54: #include "ssh2.h"
1.186 stevesk 55: #include "version.h"
1.252 djm 56: #include "authfile.h"
57: #include "ssherr.h"
1.266 jcs 58: #include "authfd.h"
1.309 djm 59: #include "kex.h"
1.310 djm 60:
1.279 markus 61: struct sshkey *previous_host_key = NULL;
1.59 markus 62:
1.169 stevesk 63: static int matching_host_key_dns = 0;
1.145 jakob 64:
1.227 djm 65: static pid_t proxy_command_pid = 0;
66:
1.124 markus 67: /* import */
1.307 djm 68: extern int debug_flag;
1.43 markus 69: extern Options options;
1.50 markus 70: extern char *__progname;
1.91 markus 71:
1.279 markus 72: static int show_other_keys(struct hostkeys *, struct sshkey *);
73: static void warn_changed_key(struct sshkey *);
1.132 markus 74:
1.239 djm 75: /* Expand a proxy command */
76: static char *
77: expand_proxy_command(const char *proxy_command, const char *user,
1.325 naddy 78: const char *host, const char *host_arg, int port)
1.239 djm 79: {
80: char *tmp, *ret, strport[NI_MAXSERV];
1.330 dtucker 81: const char *keyalias = options.host_key_alias ?
82: options.host_key_alias : host_arg;
1.239 djm 83:
1.241 djm 84: snprintf(strport, sizeof strport, "%d", port);
1.239 djm 85: xasprintf(&tmp, "exec %s", proxy_command);
1.318 djm 86: ret = percent_expand(tmp,
87: "h", host,
1.330 dtucker 88: "k", keyalias,
1.318 djm 89: "n", host_arg,
90: "p", strport,
91: "r", options.user,
92: (char *)NULL);
1.239 djm 93: free(tmp);
94: return ret;
95: }
96:
97: /*
98: * Connect to the given ssh server using a proxy command that passes a
99: * a connected fd back to us.
100: */
101: static int
1.318 djm 102: ssh_proxy_fdpass_connect(struct ssh *ssh, const char *host,
103: const char *host_arg, u_short port, const char *proxy_command)
1.239 djm 104: {
105: char *command_string;
106: int sp[2], sock;
107: pid_t pid;
108: char *shell;
109:
110: if ((shell = getenv("SHELL")) == NULL)
111: shell = _PATH_BSHELL;
112:
1.317 deraadt 113: if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) == -1)
1.239 djm 114: fatal("Could not create socketpair to communicate with "
115: "proxy dialer: %.100s", strerror(errno));
116:
117: command_string = expand_proxy_command(proxy_command, options.user,
1.325 naddy 118: host, host_arg, port);
1.239 djm 119: debug("Executing proxy dialer command: %.500s", command_string);
120:
121: /* Fork and execute the proxy command. */
122: if ((pid = fork()) == 0) {
123: char *argv[10];
124:
125: close(sp[1]);
126: /* Redirect stdin and stdout. */
127: if (sp[0] != 0) {
1.317 deraadt 128: if (dup2(sp[0], 0) == -1)
1.239 djm 129: perror("dup2 stdin");
130: }
131: if (sp[0] != 1) {
1.317 deraadt 132: if (dup2(sp[0], 1) == -1)
1.239 djm 133: perror("dup2 stdout");
134: }
135: if (sp[0] >= 2)
136: close(sp[0]);
137:
138: /*
1.307 djm 139: * Stderr is left for non-ControlPersist connections is so
140: * error messages may be printed on the user's terminal.
1.239 djm 141: */
1.308 dtucker 142: if (!debug_flag && options.control_path != NULL &&
1.334 djm 143: options.control_persist && stdfd_devnull(0, 0, 1) == -1)
1.341 djm 144: error_f("stdfd_devnull failed");
1.307 djm 145:
1.239 djm 146: argv[0] = shell;
147: argv[1] = "-c";
148: argv[2] = command_string;
149: argv[3] = NULL;
150:
151: /*
152: * Execute the proxy command.
153: * Note that we gave up any extra privileges above.
154: */
155: execv(argv[0], argv);
156: perror(argv[0]);
157: exit(1);
158: }
159: /* Parent. */
1.317 deraadt 160: if (pid == -1)
1.239 djm 161: fatal("fork failed: %.100s", strerror(errno));
162: close(sp[0]);
163: free(command_string);
164:
165: if ((sock = mm_receive_fd(sp[1])) == -1)
166: fatal("proxy dialer did not pass back a connection");
1.271 markus 167: close(sp[1]);
1.239 djm 168:
169: while (waitpid(pid, NULL, 0) == -1)
170: if (errno != EINTR)
171: fatal("Couldn't wait for child: %s", strerror(errno));
172:
173: /* Set the connection file descriptors. */
1.286 djm 174: if (ssh_packet_set_connection(ssh, sock, sock) == NULL)
175: return -1; /* ssh_packet_set_connection logs error */
1.239 djm 176:
177: return 0;
178: }
179:
1.39 deraadt 180: /*
181: * Connect to the given ssh server using a proxy command.
182: */
1.109 itojun 183: static int
1.318 djm 184: ssh_proxy_connect(struct ssh *ssh, const char *host, const char *host_arg,
185: u_short port, const char *proxy_command)
1.1 deraadt 186: {
1.239 djm 187: char *command_string;
1.38 markus 188: int pin[2], pout[2];
1.69 deraadt 189: pid_t pid;
1.239 djm 190: char *shell;
1.237 markus 191:
1.226 djm 192: if ((shell = getenv("SHELL")) == NULL || *shell == '\0')
1.201 djm 193: shell = _PATH_BSHELL;
1.38 markus 194:
195: /* Create pipes for communicating with the proxy. */
1.317 deraadt 196: if (pipe(pin) == -1 || pipe(pout) == -1)
1.38 markus 197: fatal("Could not create pipes to communicate with the proxy: %.100s",
1.118 deraadt 198: strerror(errno));
1.38 markus 199:
1.239 djm 200: command_string = expand_proxy_command(proxy_command, options.user,
1.325 naddy 201: host, host_arg, port);
1.38 markus 202: debug("Executing proxy command: %.500s", command_string);
203:
204: /* Fork and execute the proxy command. */
205: if ((pid = fork()) == 0) {
206: char *argv[10];
207:
208: /* Redirect stdin and stdout. */
209: close(pin[1]);
210: if (pin[0] != 0) {
1.317 deraadt 211: if (dup2(pin[0], 0) == -1)
1.38 markus 212: perror("dup2 stdin");
213: close(pin[0]);
214: }
215: close(pout[0]);
1.317 deraadt 216: if (dup2(pout[1], 1) == -1)
1.38 markus 217: perror("dup2 stdout");
218: /* Cannot be 1 because pin allocated two descriptors. */
219: close(pout[1]);
220:
1.307 djm 221: /*
222: * Stderr is left for non-ControlPersist connections is so
223: * error messages may be printed on the user's terminal.
224: */
1.308 dtucker 225: if (!debug_flag && options.control_path != NULL &&
1.334 djm 226: options.control_persist && stdfd_devnull(0, 0, 1) == -1)
1.341 djm 227: error_f("stdfd_devnull failed");
1.307 djm 228:
1.201 djm 229: argv[0] = shell;
1.38 markus 230: argv[1] = "-c";
231: argv[2] = command_string;
232: argv[3] = NULL;
233:
234: /* Execute the proxy command. Note that we gave up any
235: extra privileges above. */
1.327 dtucker 236: ssh_signal(SIGPIPE, SIG_DFL);
1.89 markus 237: execv(argv[0], argv);
238: perror(argv[0]);
1.38 markus 239: exit(1);
240: }
241: /* Parent. */
1.317 deraadt 242: if (pid == -1)
1.38 markus 243: fatal("fork failed: %.100s", strerror(errno));
1.135 djm 244: else
245: proxy_command_pid = pid; /* save pid to clean up later */
1.38 markus 246:
247: /* Close child side of the descriptors. */
248: close(pin[0]);
249: close(pout[1]);
250:
251: /* Free the command name. */
1.238 djm 252: free(command_string);
1.38 markus 253:
254: /* Set the connection file descriptors. */
1.286 djm 255: if (ssh_packet_set_connection(ssh, pout[0], pin[1]) == NULL)
256: return -1; /* ssh_packet_set_connection logs error */
1.1 deraadt 257:
1.110 markus 258: return 0;
1.227 djm 259: }
260:
261: void
262: ssh_kill_proxy_command(void)
263: {
264: /*
265: * Send SIGHUP to proxy command if used. We don't wait() in
266: * case it hangs and instead rely on init to reap the child
267: */
268: if (proxy_command_pid > 1)
1.228 djm 269: kill(proxy_command_pid, SIGHUP);
1.1 deraadt 270: }
271:
1.39 deraadt 272: /*
1.295 djm 273: * Search a interface address list (returned from getifaddrs(3)) for an
1.298 djm 274: * address that matches the desired address family on the specified interface.
1.295 djm 275: * Returns 0 and fills in *resultp and *rlenp on success. Returns -1 on failure.
276: */
277: static int
278: check_ifaddrs(const char *ifname, int af, const struct ifaddrs *ifaddrs,
279: struct sockaddr_storage *resultp, socklen_t *rlenp)
280: {
281: struct sockaddr_in6 *sa6;
282: struct sockaddr_in *sa;
283: struct in6_addr *v6addr;
284: const struct ifaddrs *ifa;
285: int allow_local;
286:
287: /*
288: * Prefer addresses that are not loopback or linklocal, but use them
289: * if nothing else matches.
290: */
291: for (allow_local = 0; allow_local < 2; allow_local++) {
292: for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
293: if (ifa->ifa_addr == NULL || ifa->ifa_name == NULL ||
294: (ifa->ifa_flags & IFF_UP) == 0 ||
295: ifa->ifa_addr->sa_family != af ||
296: strcmp(ifa->ifa_name, options.bind_interface) != 0)
297: continue;
298: switch (ifa->ifa_addr->sa_family) {
299: case AF_INET:
300: sa = (struct sockaddr_in *)ifa->ifa_addr;
301: if (!allow_local && sa->sin_addr.s_addr ==
302: htonl(INADDR_LOOPBACK))
303: continue;
304: if (*rlenp < sizeof(struct sockaddr_in)) {
1.341 djm 305: error_f("v4 addr doesn't fit");
1.295 djm 306: return -1;
307: }
308: *rlenp = sizeof(struct sockaddr_in);
309: memcpy(resultp, sa, *rlenp);
310: return 0;
311: case AF_INET6:
312: sa6 = (struct sockaddr_in6 *)ifa->ifa_addr;
313: v6addr = &sa6->sin6_addr;
314: if (!allow_local &&
315: (IN6_IS_ADDR_LINKLOCAL(v6addr) ||
316: IN6_IS_ADDR_LOOPBACK(v6addr)))
317: continue;
318: if (*rlenp < sizeof(struct sockaddr_in6)) {
1.341 djm 319: error_f("v6 addr doesn't fit");
1.295 djm 320: return -1;
321: }
322: *rlenp = sizeof(struct sockaddr_in6);
323: memcpy(resultp, sa6, *rlenp);
324: return 0;
325: }
326: }
327: }
328: return -1;
329: }
330:
331: /*
1.303 dtucker 332: * Creates a socket for use as the ssh connection.
1.39 deraadt 333: */
1.109 itojun 334: static int
1.302 dtucker 335: ssh_create_socket(struct addrinfo *ai)
1.1 deraadt 336: {
1.301 dtucker 337: int sock, r;
1.295 djm 338: struct sockaddr_storage bindaddr;
339: socklen_t bindaddrlen = 0;
1.246 djm 340: struct addrinfo hints, *res = NULL;
1.295 djm 341: struct ifaddrs *ifaddrs = NULL;
342: char ntop[NI_MAXHOST];
1.1 deraadt 343:
1.217 dtucker 344: sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.317 deraadt 345: if (sock == -1) {
1.240 djm 346: error("socket: %s", strerror(errno));
1.216 dtucker 347: return -1;
348: }
349: fcntl(sock, F_SETFD, FD_CLOEXEC);
1.345 djm 350:
351: /* Use interactive QOS (if specified) until authentication completed */
352: if (options.ip_qos_interactive != INT_MAX)
353: set_sock_tos(sock, options.ip_qos_interactive);
1.105 markus 354:
355: /* Bind the socket to an alternative local IP address */
1.302 dtucker 356: if (options.bind_address == NULL && options.bind_interface == NULL)
1.105 markus 357: return sock;
358:
1.295 djm 359: if (options.bind_address != NULL) {
1.246 djm 360: memset(&hints, 0, sizeof(hints));
361: hints.ai_family = ai->ai_family;
362: hints.ai_socktype = ai->ai_socktype;
363: hints.ai_protocol = ai->ai_protocol;
364: hints.ai_flags = AI_PASSIVE;
1.295 djm 365: if ((r = getaddrinfo(options.bind_address, NULL,
366: &hints, &res)) != 0) {
1.246 djm 367: error("getaddrinfo: %s: %s", options.bind_address,
1.295 djm 368: ssh_gai_strerror(r));
369: goto fail;
370: }
1.296 dtucker 371: if (res == NULL) {
1.295 djm 372: error("getaddrinfo: no addrs");
373: goto fail;
374: }
375: memcpy(&bindaddr, res->ai_addr, res->ai_addrlen);
376: bindaddrlen = res->ai_addrlen;
377: } else if (options.bind_interface != NULL) {
378: if ((r = getifaddrs(&ifaddrs)) != 0) {
379: error("getifaddrs: %s: %s", options.bind_interface,
380: strerror(errno));
381: goto fail;
382: }
383: bindaddrlen = sizeof(bindaddr);
384: if (check_ifaddrs(options.bind_interface, ai->ai_family,
385: ifaddrs, &bindaddr, &bindaddrlen) != 0) {
386: logit("getifaddrs: %s: no suitable addresses",
387: options.bind_interface);
388: goto fail;
1.246 djm 389: }
1.105 markus 390: }
1.295 djm 391: if ((r = getnameinfo((struct sockaddr *)&bindaddr, bindaddrlen,
392: ntop, sizeof(ntop), NULL, 0, NI_NUMERICHOST)) != 0) {
1.341 djm 393: error_f("getnameinfo failed: %s", ssh_gai_strerror(r));
1.295 djm 394: goto fail;
395: }
1.301 dtucker 396: if (bind(sock, (struct sockaddr *)&bindaddr, bindaddrlen) != 0) {
1.295 djm 397: error("bind %s: %s", ntop, strerror(errno));
398: goto fail;
1.38 markus 399: }
1.341 djm 400: debug_f("bound to %s", ntop);
1.295 djm 401: /* success */
402: goto out;
403: fail:
404: close(sock);
405: sock = -1;
406: out:
1.246 djm 407: if (res != NULL)
408: freeaddrinfo(res);
1.295 djm 409: if (ifaddrs != NULL)
410: freeifaddrs(ifaddrs);
1.38 markus 411: return sock;
1.1 deraadt 412: }
413:
1.282 djm 414: /*
1.49 markus 415: * Opens a TCP/IP connection to the remote server on the given host.
416: * The address of the remote host will be returned in hostaddr.
1.302 dtucker 417: * If port is 0, the default port will be used.
1.39 deraadt 418: * Connection_attempts specifies the maximum number of tries (one per
419: * second). If proxy_command is non-NULL, it specifies the command (with %h
420: * and %p substituted for host and port, respectively) to use to contact
421: * the daemon.
422: */
1.241 djm 423: static int
1.286 djm 424: ssh_connect_direct(struct ssh *ssh, const char *host, struct addrinfo *aitop,
1.340 kn 425: struct sockaddr_storage *hostaddr, u_short port, int connection_attempts,
426: int *timeout_ms, int want_keepalive)
1.1 deraadt 427: {
1.313 dtucker 428: int on = 1, saved_timeout_ms = *timeout_ms;
1.290 djm 429: int oerrno, sock = -1, attempt;
1.90 markus 430: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1.241 djm 431: struct addrinfo *ai;
1.38 markus 432:
1.341 djm 433: debug3_f("entering");
1.268 djm 434: memset(ntop, 0, sizeof(ntop));
435: memset(strport, 0, sizeof(strport));
1.38 markus 436:
1.181 markus 437: for (attempt = 0; attempt < connection_attempts; attempt++) {
1.200 markus 438: if (attempt > 0) {
439: /* Sleep a moment before retrying. */
440: sleep(1);
1.38 markus 441: debug("Trying again...");
1.200 markus 442: }
1.181 markus 443: /*
444: * Loop through addresses for this host, and try each one in
445: * sequence until the connection succeeds.
446: */
1.49 markus 447: for (ai = aitop; ai; ai = ai->ai_next) {
1.241 djm 448: if (ai->ai_family != AF_INET &&
1.290 djm 449: ai->ai_family != AF_INET6) {
450: errno = EAFNOSUPPORT;
1.49 markus 451: continue;
1.290 djm 452: }
1.49 markus 453: if (getnameinfo(ai->ai_addr, ai->ai_addrlen,
454: ntop, sizeof(ntop), strport, sizeof(strport),
455: NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.290 djm 456: oerrno = errno;
1.341 djm 457: error_f("getnameinfo failed");
1.290 djm 458: errno = oerrno;
1.49 markus 459: continue;
460: }
461: debug("Connecting to %.200s [%.100s] port %s.",
462: host, ntop, strport);
463:
464: /* Create a socket for connecting. */
1.302 dtucker 465: sock = ssh_create_socket(ai);
1.292 stsp 466: if (sock < 0) {
1.110 markus 467: /* Any error is already output */
1.290 djm 468: errno = 0;
1.49 markus 469: continue;
1.292 stsp 470: }
1.49 markus 471:
1.313 dtucker 472: *timeout_ms = saved_timeout_ms;
1.141 djm 473: if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen,
1.202 djm 474: timeout_ms) >= 0) {
1.49 markus 475: /* Successful connection. */
1.102 markus 476: memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen);
1.38 markus 477: break;
1.49 markus 478: } else {
1.290 djm 479: oerrno = errno;
1.131 itojun 480: debug("connect to address %s port %s: %s",
481: ntop, strport, strerror(errno));
1.38 markus 482: close(sock);
1.181 markus 483: sock = -1;
1.290 djm 484: errno = oerrno;
1.38 markus 485: }
486: }
1.181 markus 487: if (sock != -1)
1.49 markus 488: break; /* Successful connection. */
1.38 markus 489: }
1.49 markus 490:
1.38 markus 491: /* Return failure if we didn't get a successful connection. */
1.181 markus 492: if (sock == -1) {
1.159 markus 493: error("ssh: connect to host %s port %s: %s",
1.290 djm 494: host, strport, errno == 0 ? "failure" : strerror(errno));
495: return -1;
1.130 itojun 496: }
1.38 markus 497:
498: debug("Connection established.");
1.90 markus 499:
1.155 markus 500: /* Set SO_KEEPALIVE if requested. */
1.202 djm 501: if (want_keepalive &&
1.90 markus 502: setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on,
1.317 deraadt 503: sizeof(on)) == -1)
1.90 markus 504: error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
1.38 markus 505:
506: /* Set the connection. */
1.286 djm 507: if (ssh_packet_set_connection(ssh, sock, sock) == NULL)
508: return -1; /* ssh_packet_set_connection logs error */
1.1 deraadt 509:
1.319 djm 510: return 0;
1.59 markus 511: }
512:
1.241 djm 513: int
1.318 djm 514: ssh_connect(struct ssh *ssh, const char *host, const char *host_arg,
515: struct addrinfo *addrs, struct sockaddr_storage *hostaddr, u_short port,
1.340 kn 516: int connection_attempts, int *timeout_ms, int want_keepalive)
1.241 djm 517: {
1.314 markus 518: int in, out;
519:
1.241 djm 520: if (options.proxy_command == NULL) {
1.286 djm 521: return ssh_connect_direct(ssh, host, addrs, hostaddr, port,
1.340 kn 522: connection_attempts, timeout_ms, want_keepalive);
1.241 djm 523: } else if (strcmp(options.proxy_command, "-") == 0) {
1.317 deraadt 524: if ((in = dup(STDIN_FILENO)) == -1 ||
525: (out = dup(STDOUT_FILENO)) == -1) {
1.314 markus 526: if (in >= 0)
527: close(in);
1.341 djm 528: error_f("dup() in/out failed");
1.314 markus 529: return -1; /* ssh_packet_set_connection logs error */
530: }
531: if ((ssh_packet_set_connection(ssh, in, out)) == NULL)
1.286 djm 532: return -1; /* ssh_packet_set_connection logs error */
533: return 0;
1.241 djm 534: } else if (options.proxy_use_fdpass) {
1.318 djm 535: return ssh_proxy_fdpass_connect(ssh, host, host_arg, port,
1.241 djm 536: options.proxy_command);
537: }
1.318 djm 538: return ssh_proxy_connect(ssh, host, host_arg, port,
539: options.proxy_command);
1.241 djm 540: }
541:
1.96 markus 542: /* defaults to 'no' */
1.109 itojun 543: static int
1.312 dtucker 544: confirm(const char *prompt, const char *fingerprint)
1.1 deraadt 545: {
1.119 markus 546: const char *msg, *again = "Please type 'yes' or 'no': ";
1.312 dtucker 547: const char *again_fp = "Please type 'yes', 'no' or the fingerprint: ";
1.326 dtucker 548: char *p, *cp;
1.119 markus 549: int ret = -1;
1.96 markus 550:
551: if (options.batch_mode)
552: return 0;
1.312 dtucker 553: for (msg = prompt;;msg = fingerprint ? again_fp : again) {
1.326 dtucker 554: cp = p = read_passphrase(msg, RP_ECHO);
1.289 djm 555: if (p == NULL)
556: return 0;
1.326 dtucker 557: p += strspn(p, " \t"); /* skip leading whitespace */
558: p[strcspn(p, " \t\n")] = '\0'; /* remove trailing whitespace */
1.289 djm 559: if (p[0] == '\0' || strcasecmp(p, "no") == 0)
1.119 markus 560: ret = 0;
1.312 dtucker 561: else if (strcasecmp(p, "yes") == 0 || (fingerprint != NULL &&
1.332 djm 562: strcmp(p, fingerprint) == 0))
1.119 markus 563: ret = 1;
1.326 dtucker 564: free(cp);
1.119 markus 565: if (ret != -1)
566: return ret;
1.1 deraadt 567: }
568: }
569:
1.219 djm 570: static int
1.229 djm 571: sockaddr_is_local(struct sockaddr *hostaddr)
572: {
573: switch (hostaddr->sa_family) {
574: case AF_INET:
575: return (ntohl(((struct sockaddr_in *)hostaddr)->
576: sin_addr.s_addr) >> 24) == IN_LOOPBACKNET;
577: case AF_INET6:
578: return IN6_IS_ADDR_LOOPBACK(
579: &(((struct sockaddr_in6 *)hostaddr)->sin6_addr));
580: default:
581: return 0;
582: }
583: }
584:
585: /*
586: * Prepare the hostname and ip address strings that are used to lookup
587: * host keys in known_hosts files. These may have a port number appended.
588: */
589: void
590: get_hostfile_hostname_ipaddr(char *hostname, struct sockaddr *hostaddr,
591: u_short port, char **hostfile_hostname, char **hostfile_ipaddr)
592: {
593: char ntop[NI_MAXHOST];
594:
595: /*
596: * We don't have the remote ip-address for connections
597: * using a proxy command
598: */
599: if (hostfile_ipaddr != NULL) {
600: if (options.proxy_command == NULL) {
601: if (getnameinfo(hostaddr, hostaddr->sa_len,
602: ntop, sizeof(ntop), NULL, 0, NI_NUMERICHOST) != 0)
1.341 djm 603: fatal_f("getnameinfo failed");
1.229 djm 604: *hostfile_ipaddr = put_host_port(ntop, port);
605: } else {
606: *hostfile_ipaddr = xstrdup("<no hostip for proxy "
607: "command>");
608: }
609: }
610:
611: /*
612: * Allow the user to record the key under a different name or
613: * differentiate a non-standard port. This is useful for ssh
614: * tunneling over forwarded connections or if you run multiple
615: * sshd's on different ports on the same machine.
616: */
617: if (hostfile_hostname != NULL) {
618: if (options.host_key_alias != NULL) {
619: *hostfile_hostname = xstrdup(options.host_key_alias);
620: debug("using hostkeyalias: %s", *hostfile_hostname);
621: } else {
622: *hostfile_hostname = put_host_port(hostname, port);
623: }
624: }
625: }
626:
1.338 djm 627: /* returns non-zero if path appears in hostfiles, or 0 if not. */
628: static int
629: path_in_hostfiles(const char *path, char **hostfiles, u_int num_hostfiles)
630: {
631: u_int i;
632:
633: for (i = 0; i < num_hostfiles; i++) {
634: if (strcmp(path, hostfiles[i]) == 0)
635: return 1;
636: }
637: return 0;
638: }
639:
1.342 djm 640: struct find_by_key_ctx {
641: const char *host, *ip;
642: const struct sshkey *key;
643: char **names;
644: u_int nnames;
645: };
646:
647: /* Try to replace home directory prefix (per $HOME) with a ~/ sequence */
648: static char *
649: try_tilde_unexpand(const char *path)
650: {
651: char *home, *ret = NULL;
652: size_t l;
653:
654: if (*path != '/')
655: return xstrdup(path);
656: if ((home = getenv("HOME")) == NULL || (l = strlen(home)) == 0)
657: return xstrdup(path);
658: if (strncmp(path, home, l) != 0)
659: return xstrdup(path);
660: /*
661: * ensure we have matched on a path boundary: either the $HOME that
662: * we just compared ends with a '/' or the next character of the path
663: * must be a '/'.
664: */
665: if (home[l - 1] != '/' && path[l] != '/')
666: return xstrdup(path);
667: if (path[l] == '/')
668: l++;
669: xasprintf(&ret, "~/%s", path + l);
670: return ret;
671: }
672:
673: static int
674: hostkeys_find_by_key_cb(struct hostkey_foreach_line *l, void *_ctx)
675: {
676: struct find_by_key_ctx *ctx = (struct find_by_key_ctx *)_ctx;
677: char *path;
678:
679: /* we are looking for keys with names that *do not* match */
680: if ((l->match & HKF_MATCH_HOST) != 0)
681: return 0;
682: /* not interested in marker lines */
683: if (l->marker != MRK_NONE)
684: return 0;
685: /* we are only interested in exact key matches */
686: if (l->key == NULL || !sshkey_equal(ctx->key, l->key))
687: return 0;
688: path = try_tilde_unexpand(l->path);
689: debug_f("found matching key in %s:%lu", path, l->linenum);
690: ctx->names = xrecallocarray(ctx->names,
691: ctx->nnames, ctx->nnames + 1, sizeof(*ctx->names));
692: xasprintf(&ctx->names[ctx->nnames], "%s:%lu: %s", path, l->linenum,
693: strncmp(l->hosts, HASH_MAGIC, strlen(HASH_MAGIC)) == 0 ?
694: "[hashed name]" : l->hosts);
695: ctx->nnames++;
696: free(path);
697: return 0;
698: }
699:
700: static int
701: hostkeys_find_by_key_hostfile(const char *file, const char *which,
702: struct find_by_key_ctx *ctx)
703: {
704: int r;
705:
706: debug3_f("trying %s hostfile \"%s\"", which, file);
707: if ((r = hostkeys_foreach(file, hostkeys_find_by_key_cb, ctx,
1.346 djm 708: ctx->host, ctx->ip, HKF_WANT_PARSE_KEY, 0)) != 0) {
1.342 djm 709: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
710: debug_f("hostkeys file %s does not exist", file);
711: return 0;
712: }
713: error_fr(r, "hostkeys_foreach failed for %s", file);
714: return r;
715: }
716: return 0;
717: }
718:
719: /*
720: * Find 'key' in known hosts file(s) that do not match host/ip.
721: * Used to display also-known-as information for previously-unseen hostkeys.
722: */
723: static void
724: hostkeys_find_by_key(const char *host, const char *ip, const struct sshkey *key,
725: char **user_hostfiles, u_int num_user_hostfiles,
726: char **system_hostfiles, u_int num_system_hostfiles,
727: char ***names, u_int *nnames)
728: {
1.343 dtucker 729: struct find_by_key_ctx ctx = {0, 0, 0, 0, 0};
1.342 djm 730: u_int i;
731:
732: *names = NULL;
733: *nnames = 0;
734:
735: if (key == NULL || sshkey_is_cert(key))
736: return;
737:
738: ctx.host = host;
739: ctx.ip = ip;
740: ctx.key = key;
741:
742: for (i = 0; i < num_user_hostfiles; i++) {
743: if (hostkeys_find_by_key_hostfile(user_hostfiles[i],
744: "user", &ctx) != 0)
745: goto fail;
746: }
747: for (i = 0; i < num_system_hostfiles; i++) {
748: if (hostkeys_find_by_key_hostfile(system_hostfiles[i],
749: "system", &ctx) != 0)
750: goto fail;
751: }
752: /* success */
753: *names = ctx.names;
754: *nnames = ctx.nnames;
755: ctx.names = NULL;
756: ctx.nnames = 0;
757: return;
758: fail:
759: for (i = 0; i < ctx.nnames; i++)
760: free(ctx.names[i]);
761: free(ctx.names);
762: }
763:
764: #define MAX_OTHER_NAMES 8 /* Maximum number of names to list */
765: static char *
766: other_hostkeys_message(const char *host, const char *ip,
767: const struct sshkey *key,
768: char **user_hostfiles, u_int num_user_hostfiles,
769: char **system_hostfiles, u_int num_system_hostfiles)
770: {
771: char *ret = NULL, **othernames = NULL;
772: u_int i, n, num_othernames = 0;
773:
774: hostkeys_find_by_key(host, ip, key,
775: user_hostfiles, num_user_hostfiles,
776: system_hostfiles, num_system_hostfiles,
777: &othernames, &num_othernames);
778: if (num_othernames == 0)
779: return xstrdup("This key is not known by any other names");
780:
781: xasprintf(&ret, "This host key is known by the following other "
782: "names/addresses:");
783:
784: n = num_othernames;
785: if (n > MAX_OTHER_NAMES)
786: n = MAX_OTHER_NAMES;
787: for (i = 0; i < n; i++) {
788: xextendf(&ret, "\n", " %s", othernames[i]);
789: }
790: if (n < num_othernames) {
791: xextendf(&ret, "\n", " (%d additional names ommitted)",
792: num_othernames - n);
793: }
794: for (i = 0; i < num_othernames; i++)
795: free(othernames[i]);
796: free(othernames);
797: return ret;
798: }
799:
1.349 djm 800: void
801: load_hostkeys_command(struct hostkeys *hostkeys, const char *command_template,
802: const char *invocation, const struct ssh_conn_info *cinfo,
803: const struct sshkey *host_key, const char *hostfile_hostname)
804: {
805: int r, i, ac = 0;
806: char *key_fp = NULL, *keytext = NULL, *tmp;
807: char *command = NULL, *tag = NULL, **av = NULL;
808: FILE *f = NULL;
809: pid_t pid;
810: void (*osigchld)(int);
811:
812: xasprintf(&tag, "KnownHostsCommand-%s", invocation);
813:
814: if (host_key != NULL) {
815: if ((key_fp = sshkey_fingerprint(host_key,
816: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
817: fatal_f("sshkey_fingerprint failed");
818: if ((r = sshkey_to_base64(host_key, &keytext)) != 0)
819: fatal_fr(r, "sshkey_to_base64 failed");
820: }
821: /*
822: * NB. all returns later this function should go via "out" to
823: * ensure the original SIGCHLD handler is restored properly.
824: */
825: osigchld = ssh_signal(SIGCHLD, SIG_DFL);
826:
827: /* Turn the command into an argument vector */
828: if (argv_split(command_template, &ac, &av) != 0) {
829: error("%s \"%s\" contains invalid quotes", tag,
830: command_template);
831: goto out;
832: }
833: if (ac == 0) {
834: error("%s \"%s\" yielded no arguments", tag,
835: command_template);
836: goto out;
837: }
838: for (i = 1; i < ac; i++) {
839: tmp = percent_dollar_expand(av[i],
840: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
841: "H", hostfile_hostname,
842: "I", invocation,
843: "t", host_key == NULL ? "NONE" : sshkey_ssh_name(host_key),
844: "f", key_fp == NULL ? "NONE" : key_fp,
845: "K", keytext == NULL ? "NONE" : keytext,
846: (char *)NULL);
847: if (tmp == NULL)
848: fatal_f("percent_expand failed");
849: free(av[i]);
850: av[i] = tmp;
851: }
852: /* Prepare a printable command for logs, etc. */
853: command = argv_assemble(ac, av);
854:
855: if ((pid = subprocess(tag, command, ac, av, &f,
856: SSH_SUBPROCESS_STDOUT_CAPTURE|SSH_SUBPROCESS_UNSAFE_PATH|
857: SSH_SUBPROCESS_PRESERVE_ENV, NULL, NULL, NULL)) == 0)
858: goto out;
859:
860: load_hostkeys_file(hostkeys, hostfile_hostname, tag, f, 1);
861:
862: if (exited_cleanly(pid, tag, command, 0) != 0)
863: fatal("KnownHostsCommand failed");
864:
865: out:
866: if (f != NULL)
867: fclose(f);
868: ssh_signal(SIGCHLD, osigchld);
869: for (i = 0; i < ac; i++)
870: free(av[i]);
871: free(av);
872: free(tag);
873: free(command);
874: free(key_fp);
875: free(keytext);
876: }
877:
1.39 deraadt 878: /*
1.108 markus 879: * check whether the supplied host key is valid, return -1 if the key
1.234 djm 880: * is not valid. user_hostfile[0] will not be updated if 'readonly' is true.
1.39 deraadt 881: */
1.197 dtucker 882: #define RDRW 0
883: #define RDONLY 1
884: #define ROQUIET 2
1.109 itojun 885: static int
1.348 djm 886: check_host_key(char *hostname, const struct ssh_conn_info *cinfo,
887: struct sockaddr *hostaddr, u_short port,
888: struct sshkey *host_key, int readonly, int clobber_port,
1.234 djm 889: char **user_hostfiles, u_int num_user_hostfiles,
1.349 djm 890: char **system_hostfiles, u_int num_system_hostfiles,
891: const char *hostfile_command)
1.1 deraadt 892: {
1.338 djm 893: HostStatus host_status = -1, ip_status = -1;
1.279 markus 894: struct sshkey *raw_key = NULL;
1.189 dtucker 895: char *ip = NULL, *host = NULL;
1.204 grunk 896: char hostline[1000], *hostp, *fp, *ra;
1.119 markus 897: char msg[1024];
1.350 ! djm 898: const char *type, *fail_reason;
1.338 djm 899: const struct hostkey_entry *host_found = NULL, *ip_found = NULL;
1.312 dtucker 900: int len, cancelled_forwarding = 0, confirmed;
1.337 djm 901: int local = sockaddr_is_local(hostaddr);
1.280 markus 902: int r, want_cert = sshkey_is_cert(host_key), host_ip_differ = 0;
1.257 djm 903: int hostkey_trusted = 0; /* Known or explicitly accepted by user */
1.229 djm 904: struct hostkeys *host_hostkeys, *ip_hostkeys;
1.234 djm 905: u_int i;
1.49 markus 906:
907: /*
908: * Force accepting of the host key for loopback/localhost. The
909: * problem is that if the home directory is NFS-mounted to multiple
910: * machines, localhost will refer to a different machine in each of
911: * them, and the user will get bogus HOST_CHANGED warnings. This
912: * essentially disables host authentication for localhost; however,
913: * this is probably not a real problem.
914: */
1.111 markus 915: if (options.no_host_authentication_for_localhost == 1 && local &&
916: options.host_key_alias == NULL) {
1.88 markus 917: debug("Forcing accepting of host key for "
918: "loopback/localhost.");
1.338 djm 919: options.update_hostkeys = 0;
1.108 markus 920: return 0;
1.49 markus 921: }
1.42 markus 922:
923: /*
1.229 djm 924: * Prepare the hostname and address strings used for hostkey lookup.
925: * In some cases, these will have a port number appended.
1.42 markus 926: */
1.348 djm 927: get_hostfile_hostname_ipaddr(hostname, hostaddr,
928: clobber_port ? 0 : port, &host, &ip);
1.206 grunk 929:
930: /*
1.88 markus 931: * Turn off check_host_ip if the connection is to localhost, via proxy
932: * command or if we don't have a hostname to compare with
933: */
1.189 dtucker 934: if (options.check_host_ip && (local ||
935: strcmp(hostname, ip) == 0 || options.proxy_command != NULL))
1.88 markus 936: options.check_host_ip = 0;
1.86 markus 937:
1.229 djm 938: host_hostkeys = init_hostkeys();
1.234 djm 939: for (i = 0; i < num_user_hostfiles; i++)
1.346 djm 940: load_hostkeys(host_hostkeys, host, user_hostfiles[i], 0);
1.234 djm 941: for (i = 0; i < num_system_hostfiles; i++)
1.346 djm 942: load_hostkeys(host_hostkeys, host, system_hostfiles[i], 0);
1.349 djm 943: if (hostfile_command != NULL && !clobber_port) {
944: load_hostkeys_command(host_hostkeys, hostfile_command,
945: "HOSTNAME", cinfo, host_key, host);
946: }
1.229 djm 947:
948: ip_hostkeys = NULL;
949: if (!want_cert && options.check_host_ip) {
950: ip_hostkeys = init_hostkeys();
1.234 djm 951: for (i = 0; i < num_user_hostfiles; i++)
1.346 djm 952: load_hostkeys(ip_hostkeys, ip, user_hostfiles[i], 0);
1.234 djm 953: for (i = 0; i < num_system_hostfiles; i++)
1.346 djm 954: load_hostkeys(ip_hostkeys, ip, system_hostfiles[i], 0);
1.349 djm 955: if (hostfile_command != NULL && !clobber_port) {
956: load_hostkeys_command(ip_hostkeys, hostfile_command,
957: "ADDRESS", cinfo, host_key, ip);
958: }
1.84 markus 959: }
1.38 markus 960:
1.219 djm 961: retry:
1.229 djm 962: /* Reload these as they may have changed on cert->key downgrade */
1.280 markus 963: want_cert = sshkey_is_cert(host_key);
964: type = sshkey_type(host_key);
1.219 djm 965:
1.46 markus 966: /*
1.170 djm 967: * Check if the host key is present in the user's list of known
1.40 markus 968: * hosts or in the systemwide list.
969: */
1.229 djm 970: host_status = check_key_in_hostkeys(host_hostkeys, host_key,
971: &host_found);
1.347 djm 972:
1.349 djm 973: /*
974: * If there are no hostfiles, or if the hostkey was found via
975: * KnownHostsCommand, then don't try to touch the disk.
976: */
977: if (!readonly && (num_user_hostfiles == 0 ||
978: (host_found != NULL && host_found->note != 0)))
1.347 djm 979: readonly = RDONLY;
1.229 djm 980:
1.40 markus 981: /*
982: * Also perform check for the ip address, skip the check if we are
1.219 djm 983: * localhost, looking for a certificate, or the hostname was an ip
984: * address to begin with.
1.40 markus 985: */
1.229 djm 986: if (!want_cert && ip_hostkeys != NULL) {
987: ip_status = check_key_in_hostkeys(ip_hostkeys, host_key,
988: &ip_found);
1.38 markus 989: if (host_status == HOST_CHANGED &&
1.319 djm 990: (ip_status != HOST_CHANGED ||
1.229 djm 991: (ip_found != NULL &&
1.280 markus 992: !sshkey_equal(ip_found->key, host_found->key))))
1.38 markus 993: host_ip_differ = 1;
994: } else
995: ip_status = host_status;
996:
997: switch (host_status) {
998: case HOST_OK:
999: /* The host is known and the key matches. */
1.219 djm 1000: debug("Host '%.200s' is known and matches the %s host %s.",
1001: host, type, want_cert ? "certificate" : "key");
1.229 djm 1002: debug("Found %s in %s:%lu", want_cert ? "CA key" : "key",
1003: host_found->file, host_found->line);
1.350 ! djm 1004: if (want_cert) {
! 1005: if (sshkey_cert_check_host(host_key,
! 1006: options.host_key_alias == NULL ?
! 1007: hostname : options.host_key_alias, 0,
! 1008: options.ca_sign_algorithms, &fail_reason) != 0) {
! 1009: error("%s", fail_reason);
! 1010: goto fail;
! 1011: }
! 1012: /*
! 1013: * Do not attempt hostkey update if a certificate was
! 1014: * successfully matched.
! 1015: */
! 1016: if (options.update_hostkeys != 0) {
! 1017: options.update_hostkeys = 0;
! 1018: debug3_f("certificate host key in use; "
! 1019: "disabling UpdateHostkeys");
! 1020: }
! 1021: }
1.338 djm 1022: /* Turn off UpdateHostkeys if key was in system known_hosts */
1023: if (options.update_hostkeys != 0 &&
1024: (path_in_hostfiles(host_found->file,
1025: system_hostfiles, num_system_hostfiles) ||
1026: (ip_status == HOST_OK && ip_found != NULL &&
1027: path_in_hostfiles(ip_found->file,
1028: system_hostfiles, num_system_hostfiles)))) {
1029: options.update_hostkeys = 0;
1.341 djm 1030: debug3_f("host key found in GlobalKnownHostsFile; "
1031: "disabling UpdateHostkeys");
1.338 djm 1032: }
1.349 djm 1033: if (options.update_hostkeys != 0 && host_found->note) {
1034: options.update_hostkeys = 0;
1035: debug3_f("host key found via KnownHostsCommand; "
1036: "disabling UpdateHostkeys");
1037: }
1.88 markus 1038: if (options.check_host_ip && ip_status == HOST_NEW) {
1.219 djm 1039: if (readonly || want_cert)
1.138 itojun 1040: logit("%s host key for IP address "
1.108 markus 1041: "'%.128s' not in list of known hosts.",
1042: type, ip);
1.234 djm 1043: else if (!add_host_to_hostfile(user_hostfiles[0], ip,
1.160 djm 1044: host_key, options.hash_known_hosts))
1.138 itojun 1045: logit("Failed to add the %s host key for IP "
1.108 markus 1046: "address '%.128s' to the list of known "
1.262 dtucker 1047: "hosts (%.500s).", type, ip,
1.234 djm 1048: user_hostfiles[0]);
1.88 markus 1049: else
1.138 itojun 1050: logit("Warning: Permanently added the %s host "
1.108 markus 1051: "key for IP address '%.128s' to the list "
1052: "of known hosts.", type, ip);
1.209 grunk 1053: } else if (options.visual_host_key) {
1.259 djm 1054: fp = sshkey_fingerprint(host_key,
1.254 djm 1055: options.fingerprint_hash, SSH_FP_DEFAULT);
1.259 djm 1056: ra = sshkey_fingerprint(host_key,
1.254 djm 1057: options.fingerprint_hash, SSH_FP_RANDOMART);
1.259 djm 1058: if (fp == NULL || ra == NULL)
1.341 djm 1059: fatal_f("sshkey_fingerprint failed");
1.264 djm 1060: logit("Host key fingerprint is %s\n%s", fp, ra);
1.238 djm 1061: free(ra);
1062: free(fp);
1.38 markus 1063: }
1.257 djm 1064: hostkey_trusted = 1;
1.38 markus 1065: break;
1066: case HOST_NEW:
1.197 dtucker 1067: if (options.host_key_alias == NULL && port != 0 &&
1.348 djm 1068: port != SSH_DEFAULT_PORT && !clobber_port) {
1.197 dtucker 1069: debug("checking without port identifier");
1.348 djm 1070: if (check_host_key(hostname, cinfo, hostaddr, 0,
1071: host_key, ROQUIET, 1,
1072: user_hostfiles, num_user_hostfiles,
1.349 djm 1073: system_hostfiles, num_system_hostfiles,
1074: hostfile_command) == 0) {
1.197 dtucker 1075: debug("found matching key w/out port");
1076: break;
1077: }
1078: }
1.219 djm 1079: if (readonly || want_cert)
1.108 markus 1080: goto fail;
1.38 markus 1081: /* The host is new. */
1.285 djm 1082: if (options.strict_host_key_checking ==
1083: SSH_STRICT_HOSTKEY_YES) {
1.108 markus 1084: /*
1085: * User has requested strict host key checking. We
1086: * will not add the host key automatically. The only
1087: * alternative left is to abort.
1088: */
1089: error("No %s host key is known for %.200s and you "
1090: "have requested strict checking.", type, host);
1091: goto fail;
1.285 djm 1092: } else if (options.strict_host_key_checking ==
1093: SSH_STRICT_HOSTKEY_ASK) {
1.342 djm 1094: char *msg1 = NULL, *msg2 = NULL;
1095:
1096: xasprintf(&msg1, "The authenticity of host "
1097: "'%.200s (%s)' can't be established", host, ip);
1098:
1099: if (show_other_keys(host_hostkeys, host_key)) {
1100: xextendf(&msg1, "\n", "but keys of different "
1101: "type are already known for this host.");
1102: } else
1103: xextendf(&msg1, "", ".");
1.145 jakob 1104:
1.259 djm 1105: fp = sshkey_fingerprint(host_key,
1.254 djm 1106: options.fingerprint_hash, SSH_FP_DEFAULT);
1.259 djm 1107: ra = sshkey_fingerprint(host_key,
1.254 djm 1108: options.fingerprint_hash, SSH_FP_RANDOMART);
1.259 djm 1109: if (fp == NULL || ra == NULL)
1.341 djm 1110: fatal_f("sshkey_fingerprint failed");
1.342 djm 1111: xextendf(&msg1, "\n", "%s key fingerprint is %s.",
1112: type, fp);
1113: if (options.visual_host_key)
1114: xextendf(&msg1, "\n", "%s", ra);
1.145 jakob 1115: if (options.verify_host_key_dns) {
1.342 djm 1116: xextendf(&msg1, "\n",
1117: "%s host key fingerprint found in DNS.",
1118: matching_host_key_dns ?
1119: "Matching" : "No matching");
1.145 jakob 1120: }
1.342 djm 1121: /* msg2 informs for other names matching this key */
1122: if ((msg2 = other_hostkeys_message(host, ip, host_key,
1123: user_hostfiles, num_user_hostfiles,
1124: system_hostfiles, num_system_hostfiles)) != NULL)
1125: xextendf(&msg1, "\n", "%s", msg2);
1126:
1127: xextendf(&msg1, "\n",
1.108 markus 1128: "Are you sure you want to continue connecting "
1.342 djm 1129: "(yes/no/[fingerprint])? ");
1130:
1131: confirmed = confirm(msg1, fp);
1.238 djm 1132: free(ra);
1133: free(fp);
1.342 djm 1134: free(msg1);
1135: free(msg2);
1.312 dtucker 1136: if (!confirmed)
1.108 markus 1137: goto fail;
1.257 djm 1138: hostkey_trusted = 1; /* user explicitly confirmed */
1.38 markus 1139: }
1.161 djm 1140: /*
1.285 djm 1141: * If in "new" or "off" strict mode, add the key automatically
1142: * to the local known_hosts file.
1.161 djm 1143: */
1.88 markus 1144: if (options.check_host_ip && ip_status == HOST_NEW) {
1.229 djm 1145: snprintf(hostline, sizeof(hostline), "%s,%s", host, ip);
1.38 markus 1146: hostp = hostline;
1.161 djm 1147: if (options.hash_known_hosts) {
1148: /* Add hash of host and IP separately */
1.234 djm 1149: r = add_host_to_hostfile(user_hostfiles[0],
1150: host, host_key, options.hash_known_hosts) &&
1151: add_host_to_hostfile(user_hostfiles[0], ip,
1.161 djm 1152: host_key, options.hash_known_hosts);
1153: } else {
1154: /* Add unhashed "host,ip" */
1.234 djm 1155: r = add_host_to_hostfile(user_hostfiles[0],
1.161 djm 1156: hostline, host_key,
1157: options.hash_known_hosts);
1158: }
1159: } else {
1.234 djm 1160: r = add_host_to_hostfile(user_hostfiles[0], host,
1161: host_key, options.hash_known_hosts);
1.38 markus 1162: hostp = host;
1.161 djm 1163: }
1.38 markus 1164:
1.161 djm 1165: if (!r)
1.138 itojun 1166: logit("Failed to add the host to the list of known "
1.234 djm 1167: "hosts (%.500s).", user_hostfiles[0]);
1.38 markus 1168: else
1.138 itojun 1169: logit("Warning: Permanently added '%.200s' (%s) to the "
1.108 markus 1170: "list of known hosts.", hostp, type);
1.38 markus 1171: break;
1.220 djm 1172: case HOST_REVOKED:
1173: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1174: error("@ WARNING: REVOKED HOST KEY DETECTED! @");
1175: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1176: error("The %s host key for %s is marked as revoked.", type, host);
1177: error("This could mean that a stolen key is being used to");
1178: error("impersonate this host.");
1179:
1180: /*
1181: * If strict host key checking is in use, the user will have
1182: * to edit the key manually and we can only abort.
1183: */
1.285 djm 1184: if (options.strict_host_key_checking !=
1185: SSH_STRICT_HOSTKEY_OFF) {
1.220 djm 1186: error("%s host key for %.200s was revoked and you have "
1187: "requested strict checking.", type, host);
1188: goto fail;
1189: }
1190: goto continue_unsafe;
1191:
1.38 markus 1192: case HOST_CHANGED:
1.219 djm 1193: if (want_cert) {
1194: /*
1195: * This is only a debug() since it is valid to have
1196: * CAs with wildcard DNS matches that don't match
1197: * all hosts that one might visit.
1198: */
1199: debug("Host certificate authority does not "
1.229 djm 1200: "match %s in %s:%lu", CA_MARKER,
1201: host_found->file, host_found->line);
1.219 djm 1202: goto fail;
1203: }
1.197 dtucker 1204: if (readonly == ROQUIET)
1205: goto fail;
1.38 markus 1206: if (options.check_host_ip && host_ip_differ) {
1.158 avsm 1207: char *key_msg;
1.38 markus 1208: if (ip_status == HOST_NEW)
1.158 avsm 1209: key_msg = "is unknown";
1.38 markus 1210: else if (ip_status == HOST_OK)
1.158 avsm 1211: key_msg = "is unchanged";
1.38 markus 1212: else
1.158 avsm 1213: key_msg = "has a different value";
1.38 markus 1214: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1215: error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @");
1216: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.72 markus 1217: error("The %s host key for %s has changed,", type, host);
1.208 ian 1218: error("and the key for the corresponding IP address %s", ip);
1.158 avsm 1219: error("%s. This could either mean that", key_msg);
1.38 markus 1220: error("DNS SPOOFING is happening or the IP address for the host");
1.85 markus 1221: error("and its host key have changed at the same time.");
1.88 markus 1222: if (ip_status != HOST_NEW)
1.229 djm 1223: error("Offending key for IP in %s:%lu",
1224: ip_found->file, ip_found->line);
1.38 markus 1225: }
1226: /* The host key has changed. */
1.150 jakob 1227: warn_changed_key(host_key);
1.38 markus 1228: error("Add correct host key in %.100s to get rid of this message.",
1.234 djm 1229: user_hostfiles[0]);
1.280 markus 1230: error("Offending %s key in %s:%lu",
1231: sshkey_type(host_found->key),
1.229 djm 1232: host_found->file, host_found->line);
1.38 markus 1233:
1.40 markus 1234: /*
1235: * If strict host key checking is in use, the user will have
1236: * to edit the key manually and we can only abort.
1237: */
1.285 djm 1238: if (options.strict_host_key_checking !=
1239: SSH_STRICT_HOSTKEY_OFF) {
1.344 djm 1240: error("Host key for %.200s has changed and you have "
1241: "requested strict checking.", host);
1.108 markus 1242: goto fail;
1243: }
1.38 markus 1244:
1.220 djm 1245: continue_unsafe:
1.40 markus 1246: /*
1247: * If strict host key checking has not been requested, allow
1.144 djm 1248: * the connection but without MITM-able authentication or
1.194 stevesk 1249: * forwarding.
1.40 markus 1250: */
1.38 markus 1251: if (options.password_authentication) {
1.108 markus 1252: error("Password authentication is disabled to avoid "
1253: "man-in-the-middle attacks.");
1.38 markus 1254: options.password_authentication = 0;
1.210 dtucker 1255: cancelled_forwarding = 1;
1.144 djm 1256: }
1257: if (options.kbd_interactive_authentication) {
1258: error("Keyboard-interactive authentication is disabled"
1259: " to avoid man-in-the-middle attacks.");
1260: options.kbd_interactive_authentication = 0;
1261: options.challenge_response_authentication = 0;
1.210 dtucker 1262: cancelled_forwarding = 1;
1.144 djm 1263: }
1264: if (options.challenge_response_authentication) {
1265: error("Challenge/response authentication is disabled"
1266: " to avoid man-in-the-middle attacks.");
1267: options.challenge_response_authentication = 0;
1.210 dtucker 1268: cancelled_forwarding = 1;
1.38 markus 1269: }
1270: if (options.forward_agent) {
1.108 markus 1271: error("Agent forwarding is disabled to avoid "
1272: "man-in-the-middle attacks.");
1.38 markus 1273: options.forward_agent = 0;
1.210 dtucker 1274: cancelled_forwarding = 1;
1.83 markus 1275: }
1276: if (options.forward_x11) {
1.108 markus 1277: error("X11 forwarding is disabled to avoid "
1278: "man-in-the-middle attacks.");
1.83 markus 1279: options.forward_x11 = 0;
1.210 dtucker 1280: cancelled_forwarding = 1;
1.83 markus 1281: }
1.108 markus 1282: if (options.num_local_forwards > 0 ||
1283: options.num_remote_forwards > 0) {
1284: error("Port forwarding is disabled to avoid "
1285: "man-in-the-middle attacks.");
1286: options.num_local_forwards =
1.118 deraadt 1287: options.num_remote_forwards = 0;
1.210 dtucker 1288: cancelled_forwarding = 1;
1.194 stevesk 1289: }
1290: if (options.tun_open != SSH_TUNMODE_NO) {
1291: error("Tunnel forwarding is disabled to avoid "
1292: "man-in-the-middle attacks.");
1293: options.tun_open = SSH_TUNMODE_NO;
1.210 dtucker 1294: cancelled_forwarding = 1;
1.339 djm 1295: }
1296: if (options.update_hostkeys != 0) {
1297: error("UpdateHostkeys is disabled because the host "
1298: "key is not trusted.");
1299: options.update_hostkeys = 0;
1.38 markus 1300: }
1.210 dtucker 1301: if (options.exit_on_forward_failure && cancelled_forwarding)
1302: fatal("Error: forwarding disabled due to host key "
1303: "check failure");
1304:
1.40 markus 1305: /*
1306: * XXX Should permit the user to change to use the new id.
1307: * This could be done by converting the host key to an
1308: * identifying sentence, tell that the host identifies itself
1.218 dtucker 1309: * by that sentence, and ask the user if he/she wishes to
1.40 markus 1310: * accept the authentication.
1311: */
1.38 markus 1312: break;
1.132 markus 1313: case HOST_FOUND:
1314: fatal("internal error");
1315: break;
1.88 markus 1316: }
1317:
1318: if (options.check_host_ip && host_status != HOST_CHANGED &&
1319: ip_status == HOST_CHANGED) {
1.119 markus 1320: snprintf(msg, sizeof(msg),
1321: "Warning: the %s host key for '%.200s' "
1322: "differs from the key for the IP address '%.128s'"
1.229 djm 1323: "\nOffending key for IP in %s:%lu",
1324: type, host, ip, ip_found->file, ip_found->line);
1.119 markus 1325: if (host_status == HOST_OK) {
1326: len = strlen(msg);
1327: snprintf(msg + len, sizeof(msg) - len,
1.229 djm 1328: "\nMatching host key in %s:%lu",
1329: host_found->file, host_found->line);
1.119 markus 1330: }
1.285 djm 1331: if (options.strict_host_key_checking ==
1332: SSH_STRICT_HOSTKEY_ASK) {
1.119 markus 1333: strlcat(msg, "\nAre you sure you want "
1334: "to continue connecting (yes/no)? ", sizeof(msg));
1.312 dtucker 1335: if (!confirm(msg, NULL))
1.108 markus 1336: goto fail;
1.285 djm 1337: } else if (options.strict_host_key_checking !=
1338: SSH_STRICT_HOSTKEY_OFF) {
1339: logit("%s", msg);
1340: error("Exiting, you have requested strict checking.");
1341: goto fail;
1.119 markus 1342: } else {
1.143 djm 1343: logit("%s", msg);
1.88 markus 1344: }
1.257 djm 1345: }
1346:
1347: if (!hostkey_trusted && options.update_hostkeys) {
1.341 djm 1348: debug_f("hostkey not known or explicitly trusted: "
1349: "disabling UpdateHostkeys");
1.257 djm 1350: options.update_hostkeys = 0;
1.38 markus 1351: }
1.82 provos 1352:
1.238 djm 1353: free(ip);
1354: free(host);
1.229 djm 1355: if (host_hostkeys != NULL)
1356: free_hostkeys(host_hostkeys);
1357: if (ip_hostkeys != NULL)
1358: free_hostkeys(ip_hostkeys);
1.108 markus 1359: return 0;
1360:
1361: fail:
1.337 djm 1362: if (want_cert && host_status != HOST_REVOKED) {
1.219 djm 1363: /*
1364: * No matching certificate. Downgrade cert to raw key and
1365: * search normally.
1366: */
1367: debug("No matching CA found. Retry with plain key");
1.280 markus 1368: if ((r = sshkey_from_private(host_key, &raw_key)) != 0)
1.341 djm 1369: fatal_fr(r, "decode key");
1.280 markus 1370: if ((r = sshkey_drop_cert(raw_key)) != 0)
1.341 djm 1371: fatal_r(r, "Couldn't drop certificate");
1.219 djm 1372: host_key = raw_key;
1373: goto retry;
1374: }
1.293 dtucker 1375: sshkey_free(raw_key);
1.238 djm 1376: free(ip);
1377: free(host);
1.229 djm 1378: if (host_hostkeys != NULL)
1379: free_hostkeys(host_hostkeys);
1380: if (ip_hostkeys != NULL)
1381: free_hostkeys(ip_hostkeys);
1.108 markus 1382: return -1;
1383: }
1384:
1.337 djm 1385: /* returns 0 if key verifies or -1 if key does NOT verify */
1.108 markus 1386: int
1.348 djm 1387: verify_host_key(char *host, struct sockaddr *hostaddr, struct sshkey *host_key,
1388: const struct ssh_conn_info *cinfo)
1.108 markus 1389: {
1.267 djm 1390: u_int i;
1.337 djm 1391: int r = -1, flags = 0;
1.267 djm 1392: char valid[64], *fp = NULL, *cafp = NULL;
1.252 djm 1393: struct sshkey *plain = NULL;
1.229 djm 1394:
1.252 djm 1395: if ((fp = sshkey_fingerprint(host_key,
1.254 djm 1396: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL) {
1.341 djm 1397: error_fr(r, "fingerprint host key");
1.252 djm 1398: r = -1;
1399: goto out;
1400: }
1401:
1.267 djm 1402: if (sshkey_is_cert(host_key)) {
1403: if ((cafp = sshkey_fingerprint(host_key->cert->signature_key,
1404: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL) {
1.341 djm 1405: error_fr(r, "fingerprint CA key");
1.267 djm 1406: r = -1;
1407: goto out;
1408: }
1409: sshkey_format_cert_validity(host_key->cert,
1410: valid, sizeof(valid));
1411: debug("Server host certificate: %s %s, serial %llu "
1412: "ID \"%s\" CA %s %s valid %s",
1413: sshkey_ssh_name(host_key), fp,
1.269 djm 1414: (unsigned long long)host_key->cert->serial,
1415: host_key->cert->key_id,
1.267 djm 1416: sshkey_ssh_name(host_key->cert->signature_key), cafp,
1417: valid);
1418: for (i = 0; i < host_key->cert->nprincipals; i++) {
1419: debug2("Server host certificate hostname: %s",
1420: host_key->cert->principals[i]);
1421: }
1422: } else {
1.276 djm 1423: debug("Server host key: %s %s", sshkey_ssh_name(host_key), fp);
1.267 djm 1424: }
1.252 djm 1425:
1426: if (sshkey_equal(previous_host_key, host_key)) {
1.341 djm 1427: debug2_f("server host key %s %s matches cached key",
1428: sshkey_type(host_key), fp);
1.252 djm 1429: r = 0;
1430: goto out;
1431: }
1432:
1433: /* Check in RevokedHostKeys file if specified */
1434: if (options.revoked_host_keys != NULL) {
1435: r = sshkey_check_revoked(host_key, options.revoked_host_keys);
1436: switch (r) {
1437: case 0:
1438: break; /* not revoked */
1439: case SSH_ERR_KEY_REVOKED:
1440: error("Host key %s %s revoked by file %s",
1441: sshkey_type(host_key), fp,
1442: options.revoked_host_keys);
1443: r = -1;
1444: goto out;
1445: default:
1.341 djm 1446: error_r(r, "Error checking host key %s %s in "
1447: "revoked keys file %s", sshkey_type(host_key),
1448: fp, options.revoked_host_keys);
1.252 djm 1449: r = -1;
1450: goto out;
1451: }
1.250 djm 1452: }
1453:
1.247 djm 1454: if (options.verify_host_key_dns) {
1455: /*
1456: * XXX certs are not yet supported for DNS, so downgrade
1457: * them and try the plain key.
1458: */
1.252 djm 1459: if ((r = sshkey_from_private(host_key, &plain)) != 0)
1460: goto out;
1461: if (sshkey_is_cert(plain))
1462: sshkey_drop_cert(plain);
1.247 djm 1463: if (verify_host_key_dns(host, hostaddr, plain, &flags) == 0) {
1464: if (flags & DNS_VERIFY_FOUND) {
1465: if (options.verify_host_key_dns == 1 &&
1466: flags & DNS_VERIFY_MATCH &&
1467: flags & DNS_VERIFY_SECURE) {
1.250 djm 1468: r = 0;
1.252 djm 1469: goto out;
1.247 djm 1470: }
1471: if (flags & DNS_VERIFY_MATCH) {
1472: matching_host_key_dns = 1;
1473: } else {
1.287 djm 1474: warn_changed_key(plain);
1475: error("Update the SSHFP RR in DNS "
1476: "with the new host key to get rid "
1477: "of this message.");
1.247 djm 1478: }
1.153 jakob 1479: }
1.140 jakob 1480: }
1481: }
1.348 djm 1482: r = check_host_key(host, cinfo, hostaddr, options.port, host_key,
1483: RDRW, 0, options.user_hostfiles, options.num_user_hostfiles,
1.349 djm 1484: options.system_hostfiles, options.num_system_hostfiles,
1485: options.known_hosts_command);
1.250 djm 1486:
1.252 djm 1487: out:
1488: sshkey_free(plain);
1489: free(fp);
1.267 djm 1490: free(cafp);
1.337 djm 1491: if (r == 0 && host_key != NULL) {
1492: sshkey_free(previous_host_key);
1493: r = sshkey_from_private(host_key, &previous_host_key);
1.250 djm 1494: }
1495:
1496: return r;
1.51 markus 1497: }
1.70 markus 1498:
1.51 markus 1499: /*
1500: * Starts a dialog with the server, and authenticates the current user on the
1501: * server. This does not need any extra privileges. The basic connection
1502: * to the server must already have been established before this is called.
1503: * If login fails, this function prints an error and never returns.
1504: * This function does not require super-user privileges.
1505: */
1506: void
1.309 djm 1507: ssh_login(struct ssh *ssh, Sensitive *sensitive, const char *orighost,
1.348 djm 1508: struct sockaddr *hostaddr, u_short port, struct passwd *pw, int timeout_ms,
1509: const struct ssh_conn_info *cinfo)
1.51 markus 1510: {
1.241 djm 1511: char *host;
1.70 markus 1512: char *server_user, *local_user;
1.329 djm 1513: int r;
1.70 markus 1514:
1515: local_user = xstrdup(pw->pw_name);
1516: server_user = options.user ? options.user : local_user;
1.51 markus 1517:
1518: /* Convert the user-supplied hostname into all lowercase. */
1519: host = xstrdup(orighost);
1.241 djm 1520: lowercase(host);
1.51 markus 1521:
1522: /* Exchange protocol version identification strings with the server. */
1.329 djm 1523: if ((r = kex_exchange_identification(ssh, timeout_ms, NULL)) != 0)
1524: sshpkt_fatal(ssh, r, "banner exchange");
1.51 markus 1525:
1526: /* Put the connection into non-blocking mode. */
1.309 djm 1527: ssh_packet_set_nonblocking(ssh);
1.51 markus 1528:
1529: /* key exchange */
1530: /* authenticate user */
1.261 dtucker 1531: debug("Authenticating to %s:%d as '%s'", host, port, server_user);
1.348 djm 1532: ssh_kex2(ssh, host, hostaddr, port, cinfo);
1.309 djm 1533: ssh_userauth2(ssh, local_user, server_user, host, sensitive);
1.238 djm 1534: free(local_user);
1.315 dtucker 1535: free(host);
1.132 markus 1536: }
1537:
1538: /* print all known host keys for a given host, but skip keys of given type */
1539: static int
1.279 markus 1540: show_other_keys(struct hostkeys *hostkeys, struct sshkey *key)
1.132 markus 1541: {
1.242 djm 1542: int type[] = {
1543: KEY_RSA,
1544: KEY_DSA,
1545: KEY_ECDSA,
1546: KEY_ED25519,
1.297 markus 1547: KEY_XMSS,
1.242 djm 1548: -1
1549: };
1.229 djm 1550: int i, ret = 0;
1551: char *fp, *ra;
1552: const struct hostkey_entry *found;
1.132 markus 1553:
1554: for (i = 0; type[i] != -1; i++) {
1555: if (type[i] == key->type)
1556: continue;
1.335 djm 1557: if (!lookup_key_in_hostkeys_by_type(hostkeys, type[i],
1558: -1, &found))
1.132 markus 1559: continue;
1.259 djm 1560: fp = sshkey_fingerprint(found->key,
1.254 djm 1561: options.fingerprint_hash, SSH_FP_DEFAULT);
1.259 djm 1562: ra = sshkey_fingerprint(found->key,
1.254 djm 1563: options.fingerprint_hash, SSH_FP_RANDOMART);
1.259 djm 1564: if (fp == NULL || ra == NULL)
1.341 djm 1565: fatal_f("sshkey_fingerprint fail");
1.229 djm 1566: logit("WARNING: %s key found for host %s\n"
1567: "in %s:%lu\n"
1568: "%s key fingerprint %s.",
1.300 markus 1569: sshkey_type(found->key),
1.229 djm 1570: found->host, found->file, found->line,
1.300 markus 1571: sshkey_type(found->key), fp);
1.229 djm 1572: if (options.visual_host_key)
1573: logit("%s", ra);
1.238 djm 1574: free(ra);
1575: free(fp);
1.229 djm 1576: ret = 1;
1.132 markus 1577: }
1.229 djm 1578: return ret;
1.150 jakob 1579: }
1580:
1581: static void
1.279 markus 1582: warn_changed_key(struct sshkey *host_key)
1.150 jakob 1583: {
1584: char *fp;
1585:
1.259 djm 1586: fp = sshkey_fingerprint(host_key, options.fingerprint_hash,
1.254 djm 1587: SSH_FP_DEFAULT);
1.259 djm 1588: if (fp == NULL)
1.341 djm 1589: fatal_f("sshkey_fingerprint fail");
1.150 jakob 1590:
1591: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1592: error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @");
1593: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1594: error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!");
1595: error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!");
1.230 markus 1596: error("It is also possible that a host key has just been changed.");
1.150 jakob 1597: error("The fingerprint for the %s key sent by the remote host is\n%s.",
1.300 markus 1598: sshkey_type(host_key), fp);
1.150 jakob 1599: error("Please contact your system administrator.");
1600:
1.238 djm 1601: free(fp);
1.171 reyk 1602: }
1603:
1604: /*
1605: * Execute a local command
1606: */
1607: int
1608: ssh_local_cmd(const char *args)
1609: {
1610: char *shell;
1611: pid_t pid;
1612: int status;
1.231 djm 1613: void (*osighand)(int);
1.171 reyk 1614:
1615: if (!options.permit_local_command ||
1616: args == NULL || !*args)
1617: return (1);
1618:
1.226 djm 1619: if ((shell = getenv("SHELL")) == NULL || *shell == '\0')
1.171 reyk 1620: shell = _PATH_BSHELL;
1621:
1.327 dtucker 1622: osighand = ssh_signal(SIGCHLD, SIG_DFL);
1.171 reyk 1623: pid = fork();
1624: if (pid == 0) {
1.327 dtucker 1625: ssh_signal(SIGPIPE, SIG_DFL);
1.171 reyk 1626: debug3("Executing %s -c \"%s\"", shell, args);
1627: execl(shell, shell, "-c", args, (char *)NULL);
1628: error("Couldn't execute %s -c \"%s\": %s",
1629: shell, args, strerror(errno));
1630: _exit(1);
1631: } else if (pid == -1)
1632: fatal("fork failed: %.100s", strerror(errno));
1633: while (waitpid(pid, &status, 0) == -1)
1634: if (errno != EINTR)
1635: fatal("Couldn't wait for child: %s", strerror(errno));
1.327 dtucker 1636: ssh_signal(SIGCHLD, osighand);
1.171 reyk 1637:
1638: if (!WIFEXITED(status))
1639: return (1);
1640:
1641: return (WEXITSTATUS(status));
1.266 jcs 1642: }
1643:
1644: void
1.328 djm 1645: maybe_add_key_to_agent(const char *authfile, struct sshkey *private,
1646: const char *comment, const char *passphrase)
1.266 jcs 1647: {
1648: int auth_sock = -1, r;
1.321 djm 1649: const char *skprovider = NULL;
1.266 jcs 1650:
1651: if (options.add_keys_to_agent == 0)
1652: return;
1653:
1654: if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) {
1655: debug3("no authentication agent, not adding key");
1656: return;
1657: }
1658:
1659: if (options.add_keys_to_agent == 2 &&
1660: !ask_permission("Add key %s (%s) to agent?", authfile, comment)) {
1661: debug3("user denied adding this key");
1.273 dtucker 1662: close(auth_sock);
1.266 jcs 1663: return;
1664: }
1.322 markus 1665: if (sshkey_is_sk(private))
1.321 djm 1666: skprovider = options.sk_provider;
1.328 djm 1667: if ((r = ssh_add_identity_constrained(auth_sock, private,
1.331 djm 1668: comment == NULL ? authfile : comment,
1669: options.add_keys_to_agent_lifespan,
1.321 djm 1670: (options.add_keys_to_agent == 3), 0, skprovider)) == 0)
1.266 jcs 1671: debug("identity added to agent: %s", authfile);
1672: else
1673: debug("could not add identity to agent: %s (%d)", authfile, r);
1.273 dtucker 1674: close(auth_sock);
1.1 deraadt 1675: }
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