Annotation of src/usr.bin/ssh/sshconnect.c, Revision 1.353
1.353 ! djm 1: /* $OpenBSD: sshconnect.c,v 1.352 2021/04/03 06:18:41 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 ?
1.352 djm 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:
1.352 djm 234: /*
235: * Execute the proxy command. Note that we gave up any
236: * extra privileges above.
237: */
1.327 dtucker 238: ssh_signal(SIGPIPE, SIG_DFL);
1.89 markus 239: execv(argv[0], argv);
240: perror(argv[0]);
1.38 markus 241: exit(1);
242: }
243: /* Parent. */
1.317 deraadt 244: if (pid == -1)
1.38 markus 245: fatal("fork failed: %.100s", strerror(errno));
1.135 djm 246: else
247: proxy_command_pid = pid; /* save pid to clean up later */
1.38 markus 248:
249: /* Close child side of the descriptors. */
250: close(pin[0]);
251: close(pout[1]);
252:
253: /* Free the command name. */
1.238 djm 254: free(command_string);
1.38 markus 255:
256: /* Set the connection file descriptors. */
1.286 djm 257: if (ssh_packet_set_connection(ssh, pout[0], pin[1]) == NULL)
258: return -1; /* ssh_packet_set_connection logs error */
1.1 deraadt 259:
1.110 markus 260: return 0;
1.227 djm 261: }
262:
263: void
264: ssh_kill_proxy_command(void)
265: {
266: /*
267: * Send SIGHUP to proxy command if used. We don't wait() in
268: * case it hangs and instead rely on init to reap the child
269: */
270: if (proxy_command_pid > 1)
1.228 djm 271: kill(proxy_command_pid, SIGHUP);
1.1 deraadt 272: }
273:
1.39 deraadt 274: /*
1.295 djm 275: * Search a interface address list (returned from getifaddrs(3)) for an
1.298 djm 276: * address that matches the desired address family on the specified interface.
1.295 djm 277: * Returns 0 and fills in *resultp and *rlenp on success. Returns -1 on failure.
278: */
279: static int
280: check_ifaddrs(const char *ifname, int af, const struct ifaddrs *ifaddrs,
281: struct sockaddr_storage *resultp, socklen_t *rlenp)
282: {
283: struct sockaddr_in6 *sa6;
284: struct sockaddr_in *sa;
285: struct in6_addr *v6addr;
286: const struct ifaddrs *ifa;
287: int allow_local;
288:
289: /*
290: * Prefer addresses that are not loopback or linklocal, but use them
291: * if nothing else matches.
292: */
293: for (allow_local = 0; allow_local < 2; allow_local++) {
294: for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
295: if (ifa->ifa_addr == NULL || ifa->ifa_name == NULL ||
296: (ifa->ifa_flags & IFF_UP) == 0 ||
297: ifa->ifa_addr->sa_family != af ||
298: strcmp(ifa->ifa_name, options.bind_interface) != 0)
299: continue;
300: switch (ifa->ifa_addr->sa_family) {
301: case AF_INET:
302: sa = (struct sockaddr_in *)ifa->ifa_addr;
303: if (!allow_local && sa->sin_addr.s_addr ==
304: htonl(INADDR_LOOPBACK))
305: continue;
306: if (*rlenp < sizeof(struct sockaddr_in)) {
1.341 djm 307: error_f("v4 addr doesn't fit");
1.295 djm 308: return -1;
309: }
310: *rlenp = sizeof(struct sockaddr_in);
311: memcpy(resultp, sa, *rlenp);
312: return 0;
313: case AF_INET6:
314: sa6 = (struct sockaddr_in6 *)ifa->ifa_addr;
315: v6addr = &sa6->sin6_addr;
316: if (!allow_local &&
317: (IN6_IS_ADDR_LINKLOCAL(v6addr) ||
318: IN6_IS_ADDR_LOOPBACK(v6addr)))
319: continue;
320: if (*rlenp < sizeof(struct sockaddr_in6)) {
1.341 djm 321: error_f("v6 addr doesn't fit");
1.295 djm 322: return -1;
323: }
324: *rlenp = sizeof(struct sockaddr_in6);
325: memcpy(resultp, sa6, *rlenp);
326: return 0;
327: }
328: }
329: }
330: return -1;
331: }
332:
333: /*
1.303 dtucker 334: * Creates a socket for use as the ssh connection.
1.39 deraadt 335: */
1.109 itojun 336: static int
1.302 dtucker 337: ssh_create_socket(struct addrinfo *ai)
1.1 deraadt 338: {
1.301 dtucker 339: int sock, r;
1.295 djm 340: struct sockaddr_storage bindaddr;
341: socklen_t bindaddrlen = 0;
1.246 djm 342: struct addrinfo hints, *res = NULL;
1.295 djm 343: struct ifaddrs *ifaddrs = NULL;
344: char ntop[NI_MAXHOST];
1.1 deraadt 345:
1.217 dtucker 346: sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.317 deraadt 347: if (sock == -1) {
1.240 djm 348: error("socket: %s", strerror(errno));
1.216 dtucker 349: return -1;
350: }
351: fcntl(sock, F_SETFD, FD_CLOEXEC);
1.345 djm 352:
353: /* Use interactive QOS (if specified) until authentication completed */
354: if (options.ip_qos_interactive != INT_MAX)
355: set_sock_tos(sock, options.ip_qos_interactive);
1.105 markus 356:
357: /* Bind the socket to an alternative local IP address */
1.302 dtucker 358: if (options.bind_address == NULL && options.bind_interface == NULL)
1.105 markus 359: return sock;
360:
1.295 djm 361: if (options.bind_address != NULL) {
1.246 djm 362: memset(&hints, 0, sizeof(hints));
363: hints.ai_family = ai->ai_family;
364: hints.ai_socktype = ai->ai_socktype;
365: hints.ai_protocol = ai->ai_protocol;
366: hints.ai_flags = AI_PASSIVE;
1.295 djm 367: if ((r = getaddrinfo(options.bind_address, NULL,
368: &hints, &res)) != 0) {
1.246 djm 369: error("getaddrinfo: %s: %s", options.bind_address,
1.295 djm 370: ssh_gai_strerror(r));
371: goto fail;
372: }
1.296 dtucker 373: if (res == NULL) {
1.295 djm 374: error("getaddrinfo: no addrs");
375: goto fail;
376: }
377: memcpy(&bindaddr, res->ai_addr, res->ai_addrlen);
378: bindaddrlen = res->ai_addrlen;
379: } else if (options.bind_interface != NULL) {
380: if ((r = getifaddrs(&ifaddrs)) != 0) {
381: error("getifaddrs: %s: %s", options.bind_interface,
1.352 djm 382: strerror(errno));
1.295 djm 383: goto fail;
384: }
385: bindaddrlen = sizeof(bindaddr);
386: if (check_ifaddrs(options.bind_interface, ai->ai_family,
387: ifaddrs, &bindaddr, &bindaddrlen) != 0) {
388: logit("getifaddrs: %s: no suitable addresses",
1.352 djm 389: options.bind_interface);
1.295 djm 390: goto fail;
1.246 djm 391: }
1.105 markus 392: }
1.295 djm 393: if ((r = getnameinfo((struct sockaddr *)&bindaddr, bindaddrlen,
394: ntop, sizeof(ntop), NULL, 0, NI_NUMERICHOST)) != 0) {
1.341 djm 395: error_f("getnameinfo failed: %s", ssh_gai_strerror(r));
1.295 djm 396: goto fail;
397: }
1.301 dtucker 398: if (bind(sock, (struct sockaddr *)&bindaddr, bindaddrlen) != 0) {
1.295 djm 399: error("bind %s: %s", ntop, strerror(errno));
400: goto fail;
1.38 markus 401: }
1.341 djm 402: debug_f("bound to %s", ntop);
1.295 djm 403: /* success */
404: goto out;
405: fail:
406: close(sock);
407: sock = -1;
408: out:
1.246 djm 409: if (res != NULL)
410: freeaddrinfo(res);
1.295 djm 411: if (ifaddrs != NULL)
412: freeifaddrs(ifaddrs);
1.38 markus 413: return sock;
1.1 deraadt 414: }
415:
1.282 djm 416: /*
1.49 markus 417: * Opens a TCP/IP connection to the remote server on the given host.
418: * The address of the remote host will be returned in hostaddr.
1.302 dtucker 419: * If port is 0, the default port will be used.
1.39 deraadt 420: * Connection_attempts specifies the maximum number of tries (one per
421: * second). If proxy_command is non-NULL, it specifies the command (with %h
422: * and %p substituted for host and port, respectively) to use to contact
423: * the daemon.
424: */
1.241 djm 425: static int
1.286 djm 426: ssh_connect_direct(struct ssh *ssh, const char *host, struct addrinfo *aitop,
1.340 kn 427: struct sockaddr_storage *hostaddr, u_short port, int connection_attempts,
428: int *timeout_ms, int want_keepalive)
1.1 deraadt 429: {
1.313 dtucker 430: int on = 1, saved_timeout_ms = *timeout_ms;
1.290 djm 431: int oerrno, sock = -1, attempt;
1.90 markus 432: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1.241 djm 433: struct addrinfo *ai;
1.38 markus 434:
1.341 djm 435: debug3_f("entering");
1.268 djm 436: memset(ntop, 0, sizeof(ntop));
437: memset(strport, 0, sizeof(strport));
1.38 markus 438:
1.181 markus 439: for (attempt = 0; attempt < connection_attempts; attempt++) {
1.200 markus 440: if (attempt > 0) {
441: /* Sleep a moment before retrying. */
442: sleep(1);
1.38 markus 443: debug("Trying again...");
1.200 markus 444: }
1.181 markus 445: /*
446: * Loop through addresses for this host, and try each one in
447: * sequence until the connection succeeds.
448: */
1.49 markus 449: for (ai = aitop; ai; ai = ai->ai_next) {
1.241 djm 450: if (ai->ai_family != AF_INET &&
1.290 djm 451: ai->ai_family != AF_INET6) {
452: errno = EAFNOSUPPORT;
1.49 markus 453: continue;
1.290 djm 454: }
1.49 markus 455: if (getnameinfo(ai->ai_addr, ai->ai_addrlen,
456: ntop, sizeof(ntop), strport, sizeof(strport),
457: NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.290 djm 458: oerrno = errno;
1.341 djm 459: error_f("getnameinfo failed");
1.290 djm 460: errno = oerrno;
1.49 markus 461: continue;
462: }
463: debug("Connecting to %.200s [%.100s] port %s.",
464: host, ntop, strport);
465:
466: /* Create a socket for connecting. */
1.302 dtucker 467: sock = ssh_create_socket(ai);
1.292 stsp 468: if (sock < 0) {
1.110 markus 469: /* Any error is already output */
1.290 djm 470: errno = 0;
1.49 markus 471: continue;
1.292 stsp 472: }
1.49 markus 473:
1.313 dtucker 474: *timeout_ms = saved_timeout_ms;
1.141 djm 475: if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen,
1.202 djm 476: timeout_ms) >= 0) {
1.49 markus 477: /* Successful connection. */
1.102 markus 478: memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen);
1.38 markus 479: break;
1.49 markus 480: } else {
1.290 djm 481: oerrno = errno;
1.131 itojun 482: debug("connect to address %s port %s: %s",
483: ntop, strport, strerror(errno));
1.38 markus 484: close(sock);
1.181 markus 485: sock = -1;
1.290 djm 486: errno = oerrno;
1.38 markus 487: }
488: }
1.181 markus 489: if (sock != -1)
1.49 markus 490: break; /* Successful connection. */
1.38 markus 491: }
1.49 markus 492:
1.38 markus 493: /* Return failure if we didn't get a successful connection. */
1.181 markus 494: if (sock == -1) {
1.159 markus 495: error("ssh: connect to host %s port %s: %s",
1.290 djm 496: host, strport, errno == 0 ? "failure" : strerror(errno));
497: return -1;
1.130 itojun 498: }
1.38 markus 499:
500: debug("Connection established.");
1.90 markus 501:
1.155 markus 502: /* Set SO_KEEPALIVE if requested. */
1.202 djm 503: if (want_keepalive &&
1.90 markus 504: setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on,
1.317 deraadt 505: sizeof(on)) == -1)
1.90 markus 506: error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
1.38 markus 507:
508: /* Set the connection. */
1.286 djm 509: if (ssh_packet_set_connection(ssh, sock, sock) == NULL)
510: return -1; /* ssh_packet_set_connection logs error */
1.1 deraadt 511:
1.319 djm 512: return 0;
1.59 markus 513: }
514:
1.241 djm 515: int
1.318 djm 516: ssh_connect(struct ssh *ssh, const char *host, const char *host_arg,
517: struct addrinfo *addrs, struct sockaddr_storage *hostaddr, u_short port,
1.340 kn 518: int connection_attempts, int *timeout_ms, int want_keepalive)
1.241 djm 519: {
1.314 markus 520: int in, out;
521:
1.241 djm 522: if (options.proxy_command == NULL) {
1.286 djm 523: return ssh_connect_direct(ssh, host, addrs, hostaddr, port,
1.340 kn 524: connection_attempts, timeout_ms, want_keepalive);
1.241 djm 525: } else if (strcmp(options.proxy_command, "-") == 0) {
1.317 deraadt 526: if ((in = dup(STDIN_FILENO)) == -1 ||
527: (out = dup(STDOUT_FILENO)) == -1) {
1.314 markus 528: if (in >= 0)
529: close(in);
1.341 djm 530: error_f("dup() in/out failed");
1.314 markus 531: return -1; /* ssh_packet_set_connection logs error */
532: }
533: if ((ssh_packet_set_connection(ssh, in, out)) == NULL)
1.286 djm 534: return -1; /* ssh_packet_set_connection logs error */
535: return 0;
1.241 djm 536: } else if (options.proxy_use_fdpass) {
1.318 djm 537: return ssh_proxy_fdpass_connect(ssh, host, host_arg, port,
1.241 djm 538: options.proxy_command);
539: }
1.318 djm 540: return ssh_proxy_connect(ssh, host, host_arg, port,
541: options.proxy_command);
1.241 djm 542: }
543:
1.96 markus 544: /* defaults to 'no' */
1.109 itojun 545: static int
1.312 dtucker 546: confirm(const char *prompt, const char *fingerprint)
1.1 deraadt 547: {
1.119 markus 548: const char *msg, *again = "Please type 'yes' or 'no': ";
1.312 dtucker 549: const char *again_fp = "Please type 'yes', 'no' or the fingerprint: ";
1.326 dtucker 550: char *p, *cp;
1.119 markus 551: int ret = -1;
1.96 markus 552:
553: if (options.batch_mode)
554: return 0;
1.312 dtucker 555: for (msg = prompt;;msg = fingerprint ? again_fp : again) {
1.326 dtucker 556: cp = p = read_passphrase(msg, RP_ECHO);
1.289 djm 557: if (p == NULL)
558: return 0;
1.326 dtucker 559: p += strspn(p, " \t"); /* skip leading whitespace */
560: p[strcspn(p, " \t\n")] = '\0'; /* remove trailing whitespace */
1.289 djm 561: if (p[0] == '\0' || strcasecmp(p, "no") == 0)
1.119 markus 562: ret = 0;
1.312 dtucker 563: else if (strcasecmp(p, "yes") == 0 || (fingerprint != NULL &&
1.332 djm 564: strcmp(p, fingerprint) == 0))
1.119 markus 565: ret = 1;
1.326 dtucker 566: free(cp);
1.119 markus 567: if (ret != -1)
568: return ret;
1.1 deraadt 569: }
570: }
571:
1.219 djm 572: static int
1.229 djm 573: sockaddr_is_local(struct sockaddr *hostaddr)
574: {
575: switch (hostaddr->sa_family) {
576: case AF_INET:
577: return (ntohl(((struct sockaddr_in *)hostaddr)->
578: sin_addr.s_addr) >> 24) == IN_LOOPBACKNET;
579: case AF_INET6:
580: return IN6_IS_ADDR_LOOPBACK(
581: &(((struct sockaddr_in6 *)hostaddr)->sin6_addr));
582: default:
583: return 0;
584: }
585: }
586:
587: /*
588: * Prepare the hostname and ip address strings that are used to lookup
589: * host keys in known_hosts files. These may have a port number appended.
590: */
591: void
592: get_hostfile_hostname_ipaddr(char *hostname, struct sockaddr *hostaddr,
593: u_short port, char **hostfile_hostname, char **hostfile_ipaddr)
594: {
595: char ntop[NI_MAXHOST];
596:
597: /*
598: * We don't have the remote ip-address for connections
599: * using a proxy command
600: */
601: if (hostfile_ipaddr != NULL) {
602: if (options.proxy_command == NULL) {
603: if (getnameinfo(hostaddr, hostaddr->sa_len,
604: ntop, sizeof(ntop), NULL, 0, NI_NUMERICHOST) != 0)
1.341 djm 605: fatal_f("getnameinfo failed");
1.229 djm 606: *hostfile_ipaddr = put_host_port(ntop, port);
607: } else {
608: *hostfile_ipaddr = xstrdup("<no hostip for proxy "
609: "command>");
610: }
611: }
612:
613: /*
614: * Allow the user to record the key under a different name or
615: * differentiate a non-standard port. This is useful for ssh
616: * tunneling over forwarded connections or if you run multiple
617: * sshd's on different ports on the same machine.
618: */
619: if (hostfile_hostname != NULL) {
620: if (options.host_key_alias != NULL) {
621: *hostfile_hostname = xstrdup(options.host_key_alias);
622: debug("using hostkeyalias: %s", *hostfile_hostname);
623: } else {
624: *hostfile_hostname = put_host_port(hostname, port);
625: }
626: }
627: }
628:
1.338 djm 629: /* returns non-zero if path appears in hostfiles, or 0 if not. */
630: static int
631: path_in_hostfiles(const char *path, char **hostfiles, u_int num_hostfiles)
632: {
633: u_int i;
634:
635: for (i = 0; i < num_hostfiles; i++) {
636: if (strcmp(path, hostfiles[i]) == 0)
637: return 1;
638: }
639: return 0;
640: }
641:
1.342 djm 642: struct find_by_key_ctx {
643: const char *host, *ip;
644: const struct sshkey *key;
645: char **names;
646: u_int nnames;
647: };
648:
649: /* Try to replace home directory prefix (per $HOME) with a ~/ sequence */
650: static char *
651: try_tilde_unexpand(const char *path)
652: {
653: char *home, *ret = NULL;
654: size_t l;
655:
656: if (*path != '/')
657: return xstrdup(path);
658: if ((home = getenv("HOME")) == NULL || (l = strlen(home)) == 0)
659: return xstrdup(path);
660: if (strncmp(path, home, l) != 0)
661: return xstrdup(path);
662: /*
663: * ensure we have matched on a path boundary: either the $HOME that
664: * we just compared ends with a '/' or the next character of the path
665: * must be a '/'.
666: */
667: if (home[l - 1] != '/' && path[l] != '/')
668: return xstrdup(path);
669: if (path[l] == '/')
670: l++;
671: xasprintf(&ret, "~/%s", path + l);
672: return ret;
673: }
674:
675: static int
676: hostkeys_find_by_key_cb(struct hostkey_foreach_line *l, void *_ctx)
677: {
678: struct find_by_key_ctx *ctx = (struct find_by_key_ctx *)_ctx;
679: char *path;
680:
681: /* we are looking for keys with names that *do not* match */
682: if ((l->match & HKF_MATCH_HOST) != 0)
683: return 0;
684: /* not interested in marker lines */
685: if (l->marker != MRK_NONE)
686: return 0;
687: /* we are only interested in exact key matches */
688: if (l->key == NULL || !sshkey_equal(ctx->key, l->key))
689: return 0;
690: path = try_tilde_unexpand(l->path);
691: debug_f("found matching key in %s:%lu", path, l->linenum);
692: ctx->names = xrecallocarray(ctx->names,
693: ctx->nnames, ctx->nnames + 1, sizeof(*ctx->names));
694: xasprintf(&ctx->names[ctx->nnames], "%s:%lu: %s", path, l->linenum,
695: strncmp(l->hosts, HASH_MAGIC, strlen(HASH_MAGIC)) == 0 ?
696: "[hashed name]" : l->hosts);
697: ctx->nnames++;
698: free(path);
699: return 0;
700: }
701:
702: static int
703: hostkeys_find_by_key_hostfile(const char *file, const char *which,
704: struct find_by_key_ctx *ctx)
705: {
706: int r;
707:
708: debug3_f("trying %s hostfile \"%s\"", which, file);
709: if ((r = hostkeys_foreach(file, hostkeys_find_by_key_cb, ctx,
1.346 djm 710: ctx->host, ctx->ip, HKF_WANT_PARSE_KEY, 0)) != 0) {
1.342 djm 711: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
712: debug_f("hostkeys file %s does not exist", file);
713: return 0;
714: }
715: error_fr(r, "hostkeys_foreach failed for %s", file);
716: return r;
717: }
718: return 0;
719: }
720:
721: /*
722: * Find 'key' in known hosts file(s) that do not match host/ip.
723: * Used to display also-known-as information for previously-unseen hostkeys.
724: */
725: static void
726: hostkeys_find_by_key(const char *host, const char *ip, const struct sshkey *key,
727: char **user_hostfiles, u_int num_user_hostfiles,
728: char **system_hostfiles, u_int num_system_hostfiles,
729: char ***names, u_int *nnames)
730: {
1.343 dtucker 731: struct find_by_key_ctx ctx = {0, 0, 0, 0, 0};
1.342 djm 732: u_int i;
733:
734: *names = NULL;
735: *nnames = 0;
736:
737: if (key == NULL || sshkey_is_cert(key))
738: return;
739:
740: ctx.host = host;
741: ctx.ip = ip;
742: ctx.key = key;
743:
744: for (i = 0; i < num_user_hostfiles; i++) {
745: if (hostkeys_find_by_key_hostfile(user_hostfiles[i],
746: "user", &ctx) != 0)
747: goto fail;
748: }
749: for (i = 0; i < num_system_hostfiles; i++) {
750: if (hostkeys_find_by_key_hostfile(system_hostfiles[i],
751: "system", &ctx) != 0)
752: goto fail;
753: }
754: /* success */
755: *names = ctx.names;
756: *nnames = ctx.nnames;
757: ctx.names = NULL;
758: ctx.nnames = 0;
759: return;
760: fail:
761: for (i = 0; i < ctx.nnames; i++)
762: free(ctx.names[i]);
763: free(ctx.names);
764: }
765:
766: #define MAX_OTHER_NAMES 8 /* Maximum number of names to list */
767: static char *
768: other_hostkeys_message(const char *host, const char *ip,
769: const struct sshkey *key,
770: char **user_hostfiles, u_int num_user_hostfiles,
771: char **system_hostfiles, u_int num_system_hostfiles)
772: {
773: char *ret = NULL, **othernames = NULL;
774: u_int i, n, num_othernames = 0;
775:
776: hostkeys_find_by_key(host, ip, key,
777: user_hostfiles, num_user_hostfiles,
778: system_hostfiles, num_system_hostfiles,
779: &othernames, &num_othernames);
780: if (num_othernames == 0)
781: return xstrdup("This key is not known by any other names");
782:
783: xasprintf(&ret, "This host key is known by the following other "
784: "names/addresses:");
785:
786: n = num_othernames;
787: if (n > MAX_OTHER_NAMES)
788: n = MAX_OTHER_NAMES;
789: for (i = 0; i < n; i++) {
790: xextendf(&ret, "\n", " %s", othernames[i]);
791: }
792: if (n < num_othernames) {
1.351 sthen 793: xextendf(&ret, "\n", " (%d additional names omitted)",
1.342 djm 794: num_othernames - n);
795: }
796: for (i = 0; i < num_othernames; i++)
797: free(othernames[i]);
798: free(othernames);
799: return ret;
800: }
801:
1.349 djm 802: void
803: load_hostkeys_command(struct hostkeys *hostkeys, const char *command_template,
804: const char *invocation, const struct ssh_conn_info *cinfo,
805: const struct sshkey *host_key, const char *hostfile_hostname)
806: {
807: int r, i, ac = 0;
808: char *key_fp = NULL, *keytext = NULL, *tmp;
809: char *command = NULL, *tag = NULL, **av = NULL;
810: FILE *f = NULL;
811: pid_t pid;
812: void (*osigchld)(int);
813:
814: xasprintf(&tag, "KnownHostsCommand-%s", invocation);
815:
816: if (host_key != NULL) {
817: if ((key_fp = sshkey_fingerprint(host_key,
818: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
819: fatal_f("sshkey_fingerprint failed");
820: if ((r = sshkey_to_base64(host_key, &keytext)) != 0)
821: fatal_fr(r, "sshkey_to_base64 failed");
822: }
823: /*
824: * NB. all returns later this function should go via "out" to
825: * ensure the original SIGCHLD handler is restored properly.
826: */
827: osigchld = ssh_signal(SIGCHLD, SIG_DFL);
828:
829: /* Turn the command into an argument vector */
1.353 ! djm 830: if (argv_split(command_template, &ac, &av, 0) != 0) {
1.349 djm 831: error("%s \"%s\" contains invalid quotes", tag,
1.352 djm 832: command_template);
1.349 djm 833: goto out;
834: }
835: if (ac == 0) {
836: error("%s \"%s\" yielded no arguments", tag,
837: command_template);
838: goto out;
839: }
840: for (i = 1; i < ac; i++) {
841: tmp = percent_dollar_expand(av[i],
842: DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
843: "H", hostfile_hostname,
844: "I", invocation,
845: "t", host_key == NULL ? "NONE" : sshkey_ssh_name(host_key),
846: "f", key_fp == NULL ? "NONE" : key_fp,
847: "K", keytext == NULL ? "NONE" : keytext,
848: (char *)NULL);
849: if (tmp == NULL)
850: fatal_f("percent_expand failed");
851: free(av[i]);
852: av[i] = tmp;
853: }
854: /* Prepare a printable command for logs, etc. */
855: command = argv_assemble(ac, av);
856:
857: if ((pid = subprocess(tag, command, ac, av, &f,
858: SSH_SUBPROCESS_STDOUT_CAPTURE|SSH_SUBPROCESS_UNSAFE_PATH|
859: SSH_SUBPROCESS_PRESERVE_ENV, NULL, NULL, NULL)) == 0)
860: goto out;
861:
862: load_hostkeys_file(hostkeys, hostfile_hostname, tag, f, 1);
863:
864: if (exited_cleanly(pid, tag, command, 0) != 0)
865: fatal("KnownHostsCommand failed");
866:
867: out:
868: if (f != NULL)
869: fclose(f);
870: ssh_signal(SIGCHLD, osigchld);
871: for (i = 0; i < ac; i++)
872: free(av[i]);
873: free(av);
874: free(tag);
875: free(command);
876: free(key_fp);
877: free(keytext);
878: }
879:
1.39 deraadt 880: /*
1.108 markus 881: * check whether the supplied host key is valid, return -1 if the key
1.234 djm 882: * is not valid. user_hostfile[0] will not be updated if 'readonly' is true.
1.39 deraadt 883: */
1.197 dtucker 884: #define RDRW 0
885: #define RDONLY 1
886: #define ROQUIET 2
1.109 itojun 887: static int
1.348 djm 888: check_host_key(char *hostname, const struct ssh_conn_info *cinfo,
889: struct sockaddr *hostaddr, u_short port,
890: struct sshkey *host_key, int readonly, int clobber_port,
1.234 djm 891: char **user_hostfiles, u_int num_user_hostfiles,
1.349 djm 892: char **system_hostfiles, u_int num_system_hostfiles,
893: const char *hostfile_command)
1.1 deraadt 894: {
1.338 djm 895: HostStatus host_status = -1, ip_status = -1;
1.279 markus 896: struct sshkey *raw_key = NULL;
1.189 dtucker 897: char *ip = NULL, *host = NULL;
1.204 grunk 898: char hostline[1000], *hostp, *fp, *ra;
1.119 markus 899: char msg[1024];
1.350 djm 900: const char *type, *fail_reason;
1.338 djm 901: const struct hostkey_entry *host_found = NULL, *ip_found = NULL;
1.312 dtucker 902: int len, cancelled_forwarding = 0, confirmed;
1.337 djm 903: int local = sockaddr_is_local(hostaddr);
1.280 markus 904: int r, want_cert = sshkey_is_cert(host_key), host_ip_differ = 0;
1.257 djm 905: int hostkey_trusted = 0; /* Known or explicitly accepted by user */
1.229 djm 906: struct hostkeys *host_hostkeys, *ip_hostkeys;
1.234 djm 907: u_int i;
1.49 markus 908:
909: /*
910: * Force accepting of the host key for loopback/localhost. The
911: * problem is that if the home directory is NFS-mounted to multiple
912: * machines, localhost will refer to a different machine in each of
913: * them, and the user will get bogus HOST_CHANGED warnings. This
914: * essentially disables host authentication for localhost; however,
915: * this is probably not a real problem.
916: */
1.111 markus 917: if (options.no_host_authentication_for_localhost == 1 && local &&
918: options.host_key_alias == NULL) {
1.88 markus 919: debug("Forcing accepting of host key for "
920: "loopback/localhost.");
1.338 djm 921: options.update_hostkeys = 0;
1.108 markus 922: return 0;
1.49 markus 923: }
1.42 markus 924:
925: /*
1.229 djm 926: * Prepare the hostname and address strings used for hostkey lookup.
927: * In some cases, these will have a port number appended.
1.42 markus 928: */
1.348 djm 929: get_hostfile_hostname_ipaddr(hostname, hostaddr,
930: clobber_port ? 0 : port, &host, &ip);
1.206 grunk 931:
932: /*
1.88 markus 933: * Turn off check_host_ip if the connection is to localhost, via proxy
934: * command or if we don't have a hostname to compare with
935: */
1.189 dtucker 936: if (options.check_host_ip && (local ||
937: strcmp(hostname, ip) == 0 || options.proxy_command != NULL))
1.88 markus 938: options.check_host_ip = 0;
1.86 markus 939:
1.229 djm 940: host_hostkeys = init_hostkeys();
1.234 djm 941: for (i = 0; i < num_user_hostfiles; i++)
1.346 djm 942: load_hostkeys(host_hostkeys, host, user_hostfiles[i], 0);
1.234 djm 943: for (i = 0; i < num_system_hostfiles; i++)
1.346 djm 944: load_hostkeys(host_hostkeys, host, system_hostfiles[i], 0);
1.349 djm 945: if (hostfile_command != NULL && !clobber_port) {
946: load_hostkeys_command(host_hostkeys, hostfile_command,
947: "HOSTNAME", cinfo, host_key, host);
948: }
1.229 djm 949:
950: ip_hostkeys = NULL;
951: if (!want_cert && options.check_host_ip) {
952: ip_hostkeys = init_hostkeys();
1.234 djm 953: for (i = 0; i < num_user_hostfiles; i++)
1.346 djm 954: load_hostkeys(ip_hostkeys, ip, user_hostfiles[i], 0);
1.234 djm 955: for (i = 0; i < num_system_hostfiles; i++)
1.346 djm 956: load_hostkeys(ip_hostkeys, ip, system_hostfiles[i], 0);
1.349 djm 957: if (hostfile_command != NULL && !clobber_port) {
958: load_hostkeys_command(ip_hostkeys, hostfile_command,
959: "ADDRESS", cinfo, host_key, ip);
960: }
1.84 markus 961: }
1.38 markus 962:
1.219 djm 963: retry:
1.229 djm 964: /* Reload these as they may have changed on cert->key downgrade */
1.280 markus 965: want_cert = sshkey_is_cert(host_key);
966: type = sshkey_type(host_key);
1.219 djm 967:
1.46 markus 968: /*
1.170 djm 969: * Check if the host key is present in the user's list of known
1.40 markus 970: * hosts or in the systemwide list.
971: */
1.229 djm 972: host_status = check_key_in_hostkeys(host_hostkeys, host_key,
973: &host_found);
1.347 djm 974:
1.349 djm 975: /*
976: * If there are no hostfiles, or if the hostkey was found via
977: * KnownHostsCommand, then don't try to touch the disk.
978: */
979: if (!readonly && (num_user_hostfiles == 0 ||
980: (host_found != NULL && host_found->note != 0)))
1.347 djm 981: readonly = RDONLY;
1.229 djm 982:
1.40 markus 983: /*
984: * Also perform check for the ip address, skip the check if we are
1.219 djm 985: * localhost, looking for a certificate, or the hostname was an ip
986: * address to begin with.
1.40 markus 987: */
1.229 djm 988: if (!want_cert && ip_hostkeys != NULL) {
989: ip_status = check_key_in_hostkeys(ip_hostkeys, host_key,
990: &ip_found);
1.38 markus 991: if (host_status == HOST_CHANGED &&
1.319 djm 992: (ip_status != HOST_CHANGED ||
1.229 djm 993: (ip_found != NULL &&
1.280 markus 994: !sshkey_equal(ip_found->key, host_found->key))))
1.38 markus 995: host_ip_differ = 1;
996: } else
997: ip_status = host_status;
998:
999: switch (host_status) {
1000: case HOST_OK:
1001: /* The host is known and the key matches. */
1.219 djm 1002: debug("Host '%.200s' is known and matches the %s host %s.",
1003: host, type, want_cert ? "certificate" : "key");
1.229 djm 1004: debug("Found %s in %s:%lu", want_cert ? "CA key" : "key",
1005: host_found->file, host_found->line);
1.350 djm 1006: if (want_cert) {
1007: if (sshkey_cert_check_host(host_key,
1008: options.host_key_alias == NULL ?
1009: hostname : options.host_key_alias, 0,
1010: options.ca_sign_algorithms, &fail_reason) != 0) {
1011: error("%s", fail_reason);
1012: goto fail;
1013: }
1014: /*
1015: * Do not attempt hostkey update if a certificate was
1016: * successfully matched.
1017: */
1018: if (options.update_hostkeys != 0) {
1019: options.update_hostkeys = 0;
1020: debug3_f("certificate host key in use; "
1021: "disabling UpdateHostkeys");
1022: }
1023: }
1.338 djm 1024: /* Turn off UpdateHostkeys if key was in system known_hosts */
1025: if (options.update_hostkeys != 0 &&
1026: (path_in_hostfiles(host_found->file,
1027: system_hostfiles, num_system_hostfiles) ||
1028: (ip_status == HOST_OK && ip_found != NULL &&
1029: path_in_hostfiles(ip_found->file,
1030: system_hostfiles, num_system_hostfiles)))) {
1031: options.update_hostkeys = 0;
1.341 djm 1032: debug3_f("host key found in GlobalKnownHostsFile; "
1033: "disabling UpdateHostkeys");
1.338 djm 1034: }
1.349 djm 1035: if (options.update_hostkeys != 0 && host_found->note) {
1036: options.update_hostkeys = 0;
1037: debug3_f("host key found via KnownHostsCommand; "
1038: "disabling UpdateHostkeys");
1039: }
1.88 markus 1040: if (options.check_host_ip && ip_status == HOST_NEW) {
1.219 djm 1041: if (readonly || want_cert)
1.138 itojun 1042: logit("%s host key for IP address "
1.108 markus 1043: "'%.128s' not in list of known hosts.",
1044: type, ip);
1.234 djm 1045: else if (!add_host_to_hostfile(user_hostfiles[0], ip,
1.160 djm 1046: host_key, options.hash_known_hosts))
1.138 itojun 1047: logit("Failed to add the %s host key for IP "
1.108 markus 1048: "address '%.128s' to the list of known "
1.262 dtucker 1049: "hosts (%.500s).", type, ip,
1.234 djm 1050: user_hostfiles[0]);
1.88 markus 1051: else
1.138 itojun 1052: logit("Warning: Permanently added the %s host "
1.108 markus 1053: "key for IP address '%.128s' to the list "
1054: "of known hosts.", type, ip);
1.209 grunk 1055: } else if (options.visual_host_key) {
1.259 djm 1056: fp = sshkey_fingerprint(host_key,
1.254 djm 1057: options.fingerprint_hash, SSH_FP_DEFAULT);
1.259 djm 1058: ra = sshkey_fingerprint(host_key,
1.254 djm 1059: options.fingerprint_hash, SSH_FP_RANDOMART);
1.259 djm 1060: if (fp == NULL || ra == NULL)
1.341 djm 1061: fatal_f("sshkey_fingerprint failed");
1.264 djm 1062: logit("Host key fingerprint is %s\n%s", fp, ra);
1.238 djm 1063: free(ra);
1064: free(fp);
1.38 markus 1065: }
1.257 djm 1066: hostkey_trusted = 1;
1.38 markus 1067: break;
1068: case HOST_NEW:
1.197 dtucker 1069: if (options.host_key_alias == NULL && port != 0 &&
1.348 djm 1070: port != SSH_DEFAULT_PORT && !clobber_port) {
1.197 dtucker 1071: debug("checking without port identifier");
1.348 djm 1072: if (check_host_key(hostname, cinfo, hostaddr, 0,
1073: host_key, ROQUIET, 1,
1074: user_hostfiles, num_user_hostfiles,
1.349 djm 1075: system_hostfiles, num_system_hostfiles,
1076: hostfile_command) == 0) {
1.197 dtucker 1077: debug("found matching key w/out port");
1078: break;
1079: }
1080: }
1.219 djm 1081: if (readonly || want_cert)
1.108 markus 1082: goto fail;
1.38 markus 1083: /* The host is new. */
1.285 djm 1084: if (options.strict_host_key_checking ==
1085: SSH_STRICT_HOSTKEY_YES) {
1.108 markus 1086: /*
1087: * User has requested strict host key checking. We
1088: * will not add the host key automatically. The only
1089: * alternative left is to abort.
1090: */
1091: error("No %s host key is known for %.200s and you "
1092: "have requested strict checking.", type, host);
1093: goto fail;
1.285 djm 1094: } else if (options.strict_host_key_checking ==
1095: SSH_STRICT_HOSTKEY_ASK) {
1.342 djm 1096: char *msg1 = NULL, *msg2 = NULL;
1097:
1098: xasprintf(&msg1, "The authenticity of host "
1099: "'%.200s (%s)' can't be established", host, ip);
1100:
1101: if (show_other_keys(host_hostkeys, host_key)) {
1102: xextendf(&msg1, "\n", "but keys of different "
1103: "type are already known for this host.");
1104: } else
1105: xextendf(&msg1, "", ".");
1.145 jakob 1106:
1.259 djm 1107: fp = sshkey_fingerprint(host_key,
1.254 djm 1108: options.fingerprint_hash, SSH_FP_DEFAULT);
1.259 djm 1109: ra = sshkey_fingerprint(host_key,
1.254 djm 1110: options.fingerprint_hash, SSH_FP_RANDOMART);
1.259 djm 1111: if (fp == NULL || ra == NULL)
1.341 djm 1112: fatal_f("sshkey_fingerprint failed");
1.342 djm 1113: xextendf(&msg1, "\n", "%s key fingerprint is %s.",
1114: type, fp);
1115: if (options.visual_host_key)
1116: xextendf(&msg1, "\n", "%s", ra);
1.145 jakob 1117: if (options.verify_host_key_dns) {
1.342 djm 1118: xextendf(&msg1, "\n",
1119: "%s host key fingerprint found in DNS.",
1120: matching_host_key_dns ?
1121: "Matching" : "No matching");
1.145 jakob 1122: }
1.342 djm 1123: /* msg2 informs for other names matching this key */
1124: if ((msg2 = other_hostkeys_message(host, ip, host_key,
1125: user_hostfiles, num_user_hostfiles,
1126: system_hostfiles, num_system_hostfiles)) != NULL)
1127: xextendf(&msg1, "\n", "%s", msg2);
1128:
1129: xextendf(&msg1, "\n",
1.108 markus 1130: "Are you sure you want to continue connecting "
1.342 djm 1131: "(yes/no/[fingerprint])? ");
1132:
1133: confirmed = confirm(msg1, fp);
1.238 djm 1134: free(ra);
1135: free(fp);
1.342 djm 1136: free(msg1);
1137: free(msg2);
1.312 dtucker 1138: if (!confirmed)
1.108 markus 1139: goto fail;
1.257 djm 1140: hostkey_trusted = 1; /* user explicitly confirmed */
1.38 markus 1141: }
1.161 djm 1142: /*
1.285 djm 1143: * If in "new" or "off" strict mode, add the key automatically
1144: * to the local known_hosts file.
1.161 djm 1145: */
1.88 markus 1146: if (options.check_host_ip && ip_status == HOST_NEW) {
1.229 djm 1147: snprintf(hostline, sizeof(hostline), "%s,%s", host, ip);
1.38 markus 1148: hostp = hostline;
1.161 djm 1149: if (options.hash_known_hosts) {
1150: /* Add hash of host and IP separately */
1.234 djm 1151: r = add_host_to_hostfile(user_hostfiles[0],
1152: host, host_key, options.hash_known_hosts) &&
1153: add_host_to_hostfile(user_hostfiles[0], ip,
1.161 djm 1154: host_key, options.hash_known_hosts);
1155: } else {
1156: /* Add unhashed "host,ip" */
1.234 djm 1157: r = add_host_to_hostfile(user_hostfiles[0],
1.161 djm 1158: hostline, host_key,
1159: options.hash_known_hosts);
1160: }
1161: } else {
1.234 djm 1162: r = add_host_to_hostfile(user_hostfiles[0], host,
1163: host_key, options.hash_known_hosts);
1.38 markus 1164: hostp = host;
1.161 djm 1165: }
1.38 markus 1166:
1.161 djm 1167: if (!r)
1.138 itojun 1168: logit("Failed to add the host to the list of known "
1.234 djm 1169: "hosts (%.500s).", user_hostfiles[0]);
1.38 markus 1170: else
1.138 itojun 1171: logit("Warning: Permanently added '%.200s' (%s) to the "
1.108 markus 1172: "list of known hosts.", hostp, type);
1.38 markus 1173: break;
1.220 djm 1174: case HOST_REVOKED:
1175: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1176: error("@ WARNING: REVOKED HOST KEY DETECTED! @");
1177: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1178: error("The %s host key for %s is marked as revoked.", type, host);
1179: error("This could mean that a stolen key is being used to");
1180: error("impersonate this host.");
1181:
1182: /*
1183: * If strict host key checking is in use, the user will have
1184: * to edit the key manually and we can only abort.
1185: */
1.285 djm 1186: if (options.strict_host_key_checking !=
1187: SSH_STRICT_HOSTKEY_OFF) {
1.220 djm 1188: error("%s host key for %.200s was revoked and you have "
1189: "requested strict checking.", type, host);
1190: goto fail;
1191: }
1192: goto continue_unsafe;
1193:
1.38 markus 1194: case HOST_CHANGED:
1.219 djm 1195: if (want_cert) {
1196: /*
1197: * This is only a debug() since it is valid to have
1198: * CAs with wildcard DNS matches that don't match
1199: * all hosts that one might visit.
1200: */
1201: debug("Host certificate authority does not "
1.229 djm 1202: "match %s in %s:%lu", CA_MARKER,
1203: host_found->file, host_found->line);
1.219 djm 1204: goto fail;
1205: }
1.197 dtucker 1206: if (readonly == ROQUIET)
1207: goto fail;
1.38 markus 1208: if (options.check_host_ip && host_ip_differ) {
1.158 avsm 1209: char *key_msg;
1.38 markus 1210: if (ip_status == HOST_NEW)
1.158 avsm 1211: key_msg = "is unknown";
1.38 markus 1212: else if (ip_status == HOST_OK)
1.158 avsm 1213: key_msg = "is unchanged";
1.38 markus 1214: else
1.158 avsm 1215: key_msg = "has a different value";
1.38 markus 1216: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1217: error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @");
1218: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.72 markus 1219: error("The %s host key for %s has changed,", type, host);
1.208 ian 1220: error("and the key for the corresponding IP address %s", ip);
1.158 avsm 1221: error("%s. This could either mean that", key_msg);
1.38 markus 1222: error("DNS SPOOFING is happening or the IP address for the host");
1.85 markus 1223: error("and its host key have changed at the same time.");
1.88 markus 1224: if (ip_status != HOST_NEW)
1.229 djm 1225: error("Offending key for IP in %s:%lu",
1226: ip_found->file, ip_found->line);
1.38 markus 1227: }
1228: /* The host key has changed. */
1.150 jakob 1229: warn_changed_key(host_key);
1.38 markus 1230: error("Add correct host key in %.100s to get rid of this message.",
1.234 djm 1231: user_hostfiles[0]);
1.280 markus 1232: error("Offending %s key in %s:%lu",
1233: sshkey_type(host_found->key),
1.229 djm 1234: host_found->file, host_found->line);
1.38 markus 1235:
1.40 markus 1236: /*
1237: * If strict host key checking is in use, the user will have
1238: * to edit the key manually and we can only abort.
1239: */
1.285 djm 1240: if (options.strict_host_key_checking !=
1241: SSH_STRICT_HOSTKEY_OFF) {
1.344 djm 1242: error("Host key for %.200s has changed and you have "
1243: "requested strict checking.", host);
1.108 markus 1244: goto fail;
1245: }
1.38 markus 1246:
1.220 djm 1247: continue_unsafe:
1.40 markus 1248: /*
1249: * If strict host key checking has not been requested, allow
1.144 djm 1250: * the connection but without MITM-able authentication or
1.194 stevesk 1251: * forwarding.
1.40 markus 1252: */
1.38 markus 1253: if (options.password_authentication) {
1.108 markus 1254: error("Password authentication is disabled to avoid "
1255: "man-in-the-middle attacks.");
1.38 markus 1256: options.password_authentication = 0;
1.210 dtucker 1257: cancelled_forwarding = 1;
1.144 djm 1258: }
1259: if (options.kbd_interactive_authentication) {
1260: error("Keyboard-interactive authentication is disabled"
1261: " to avoid man-in-the-middle attacks.");
1262: options.kbd_interactive_authentication = 0;
1263: options.challenge_response_authentication = 0;
1.210 dtucker 1264: cancelled_forwarding = 1;
1.144 djm 1265: }
1266: if (options.challenge_response_authentication) {
1267: error("Challenge/response authentication is disabled"
1268: " to avoid man-in-the-middle attacks.");
1269: options.challenge_response_authentication = 0;
1.210 dtucker 1270: cancelled_forwarding = 1;
1.38 markus 1271: }
1272: if (options.forward_agent) {
1.108 markus 1273: error("Agent forwarding is disabled to avoid "
1274: "man-in-the-middle attacks.");
1.38 markus 1275: options.forward_agent = 0;
1.210 dtucker 1276: cancelled_forwarding = 1;
1.83 markus 1277: }
1278: if (options.forward_x11) {
1.108 markus 1279: error("X11 forwarding is disabled to avoid "
1280: "man-in-the-middle attacks.");
1.83 markus 1281: options.forward_x11 = 0;
1.210 dtucker 1282: cancelled_forwarding = 1;
1.83 markus 1283: }
1.108 markus 1284: if (options.num_local_forwards > 0 ||
1285: options.num_remote_forwards > 0) {
1286: error("Port forwarding is disabled to avoid "
1287: "man-in-the-middle attacks.");
1288: options.num_local_forwards =
1.118 deraadt 1289: options.num_remote_forwards = 0;
1.210 dtucker 1290: cancelled_forwarding = 1;
1.194 stevesk 1291: }
1292: if (options.tun_open != SSH_TUNMODE_NO) {
1293: error("Tunnel forwarding is disabled to avoid "
1294: "man-in-the-middle attacks.");
1295: options.tun_open = SSH_TUNMODE_NO;
1.210 dtucker 1296: cancelled_forwarding = 1;
1.339 djm 1297: }
1298: if (options.update_hostkeys != 0) {
1299: error("UpdateHostkeys is disabled because the host "
1300: "key is not trusted.");
1301: options.update_hostkeys = 0;
1.38 markus 1302: }
1.210 dtucker 1303: if (options.exit_on_forward_failure && cancelled_forwarding)
1304: fatal("Error: forwarding disabled due to host key "
1305: "check failure");
1306:
1.40 markus 1307: /*
1308: * XXX Should permit the user to change to use the new id.
1309: * This could be done by converting the host key to an
1310: * identifying sentence, tell that the host identifies itself
1.218 dtucker 1311: * by that sentence, and ask the user if he/she wishes to
1.40 markus 1312: * accept the authentication.
1313: */
1.38 markus 1314: break;
1.132 markus 1315: case HOST_FOUND:
1316: fatal("internal error");
1317: break;
1.88 markus 1318: }
1319:
1320: if (options.check_host_ip && host_status != HOST_CHANGED &&
1321: ip_status == HOST_CHANGED) {
1.119 markus 1322: snprintf(msg, sizeof(msg),
1323: "Warning: the %s host key for '%.200s' "
1324: "differs from the key for the IP address '%.128s'"
1.229 djm 1325: "\nOffending key for IP in %s:%lu",
1326: type, host, ip, ip_found->file, ip_found->line);
1.119 markus 1327: if (host_status == HOST_OK) {
1328: len = strlen(msg);
1329: snprintf(msg + len, sizeof(msg) - len,
1.229 djm 1330: "\nMatching host key in %s:%lu",
1331: host_found->file, host_found->line);
1.119 markus 1332: }
1.285 djm 1333: if (options.strict_host_key_checking ==
1334: SSH_STRICT_HOSTKEY_ASK) {
1.119 markus 1335: strlcat(msg, "\nAre you sure you want "
1336: "to continue connecting (yes/no)? ", sizeof(msg));
1.312 dtucker 1337: if (!confirm(msg, NULL))
1.108 markus 1338: goto fail;
1.285 djm 1339: } else if (options.strict_host_key_checking !=
1340: SSH_STRICT_HOSTKEY_OFF) {
1341: logit("%s", msg);
1342: error("Exiting, you have requested strict checking.");
1343: goto fail;
1.119 markus 1344: } else {
1.143 djm 1345: logit("%s", msg);
1.88 markus 1346: }
1.257 djm 1347: }
1348:
1349: if (!hostkey_trusted && options.update_hostkeys) {
1.341 djm 1350: debug_f("hostkey not known or explicitly trusted: "
1351: "disabling UpdateHostkeys");
1.257 djm 1352: options.update_hostkeys = 0;
1.38 markus 1353: }
1.82 provos 1354:
1.238 djm 1355: free(ip);
1356: free(host);
1.229 djm 1357: if (host_hostkeys != NULL)
1358: free_hostkeys(host_hostkeys);
1359: if (ip_hostkeys != NULL)
1360: free_hostkeys(ip_hostkeys);
1.108 markus 1361: return 0;
1362:
1363: fail:
1.337 djm 1364: if (want_cert && host_status != HOST_REVOKED) {
1.219 djm 1365: /*
1366: * No matching certificate. Downgrade cert to raw key and
1367: * search normally.
1368: */
1369: debug("No matching CA found. Retry with plain key");
1.280 markus 1370: if ((r = sshkey_from_private(host_key, &raw_key)) != 0)
1.341 djm 1371: fatal_fr(r, "decode key");
1.280 markus 1372: if ((r = sshkey_drop_cert(raw_key)) != 0)
1.341 djm 1373: fatal_r(r, "Couldn't drop certificate");
1.219 djm 1374: host_key = raw_key;
1375: goto retry;
1376: }
1.293 dtucker 1377: sshkey_free(raw_key);
1.238 djm 1378: free(ip);
1379: free(host);
1.229 djm 1380: if (host_hostkeys != NULL)
1381: free_hostkeys(host_hostkeys);
1382: if (ip_hostkeys != NULL)
1383: free_hostkeys(ip_hostkeys);
1.108 markus 1384: return -1;
1385: }
1386:
1.337 djm 1387: /* returns 0 if key verifies or -1 if key does NOT verify */
1.108 markus 1388: int
1.348 djm 1389: verify_host_key(char *host, struct sockaddr *hostaddr, struct sshkey *host_key,
1390: const struct ssh_conn_info *cinfo)
1.108 markus 1391: {
1.267 djm 1392: u_int i;
1.337 djm 1393: int r = -1, flags = 0;
1.267 djm 1394: char valid[64], *fp = NULL, *cafp = NULL;
1.252 djm 1395: struct sshkey *plain = NULL;
1.229 djm 1396:
1.252 djm 1397: if ((fp = sshkey_fingerprint(host_key,
1.254 djm 1398: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL) {
1.341 djm 1399: error_fr(r, "fingerprint host key");
1.252 djm 1400: r = -1;
1401: goto out;
1402: }
1403:
1.267 djm 1404: if (sshkey_is_cert(host_key)) {
1405: if ((cafp = sshkey_fingerprint(host_key->cert->signature_key,
1406: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL) {
1.341 djm 1407: error_fr(r, "fingerprint CA key");
1.267 djm 1408: r = -1;
1409: goto out;
1410: }
1411: sshkey_format_cert_validity(host_key->cert,
1412: valid, sizeof(valid));
1413: debug("Server host certificate: %s %s, serial %llu "
1414: "ID \"%s\" CA %s %s valid %s",
1415: sshkey_ssh_name(host_key), fp,
1.269 djm 1416: (unsigned long long)host_key->cert->serial,
1417: host_key->cert->key_id,
1.267 djm 1418: sshkey_ssh_name(host_key->cert->signature_key), cafp,
1419: valid);
1420: for (i = 0; i < host_key->cert->nprincipals; i++) {
1421: debug2("Server host certificate hostname: %s",
1422: host_key->cert->principals[i]);
1423: }
1424: } else {
1.276 djm 1425: debug("Server host key: %s %s", sshkey_ssh_name(host_key), fp);
1.267 djm 1426: }
1.252 djm 1427:
1428: if (sshkey_equal(previous_host_key, host_key)) {
1.341 djm 1429: debug2_f("server host key %s %s matches cached key",
1430: sshkey_type(host_key), fp);
1.252 djm 1431: r = 0;
1432: goto out;
1433: }
1434:
1435: /* Check in RevokedHostKeys file if specified */
1436: if (options.revoked_host_keys != NULL) {
1437: r = sshkey_check_revoked(host_key, options.revoked_host_keys);
1438: switch (r) {
1439: case 0:
1440: break; /* not revoked */
1441: case SSH_ERR_KEY_REVOKED:
1442: error("Host key %s %s revoked by file %s",
1443: sshkey_type(host_key), fp,
1444: options.revoked_host_keys);
1445: r = -1;
1446: goto out;
1447: default:
1.341 djm 1448: error_r(r, "Error checking host key %s %s in "
1449: "revoked keys file %s", sshkey_type(host_key),
1450: fp, options.revoked_host_keys);
1.252 djm 1451: r = -1;
1452: goto out;
1453: }
1.250 djm 1454: }
1455:
1.247 djm 1456: if (options.verify_host_key_dns) {
1457: /*
1458: * XXX certs are not yet supported for DNS, so downgrade
1459: * them and try the plain key.
1460: */
1.252 djm 1461: if ((r = sshkey_from_private(host_key, &plain)) != 0)
1462: goto out;
1463: if (sshkey_is_cert(plain))
1464: sshkey_drop_cert(plain);
1.247 djm 1465: if (verify_host_key_dns(host, hostaddr, plain, &flags) == 0) {
1466: if (flags & DNS_VERIFY_FOUND) {
1467: if (options.verify_host_key_dns == 1 &&
1468: flags & DNS_VERIFY_MATCH &&
1469: flags & DNS_VERIFY_SECURE) {
1.250 djm 1470: r = 0;
1.252 djm 1471: goto out;
1.247 djm 1472: }
1473: if (flags & DNS_VERIFY_MATCH) {
1474: matching_host_key_dns = 1;
1475: } else {
1.287 djm 1476: warn_changed_key(plain);
1477: error("Update the SSHFP RR in DNS "
1478: "with the new host key to get rid "
1479: "of this message.");
1.247 djm 1480: }
1.153 jakob 1481: }
1.140 jakob 1482: }
1483: }
1.348 djm 1484: r = check_host_key(host, cinfo, hostaddr, options.port, host_key,
1485: RDRW, 0, options.user_hostfiles, options.num_user_hostfiles,
1.349 djm 1486: options.system_hostfiles, options.num_system_hostfiles,
1487: options.known_hosts_command);
1.250 djm 1488:
1.252 djm 1489: out:
1490: sshkey_free(plain);
1491: free(fp);
1.267 djm 1492: free(cafp);
1.337 djm 1493: if (r == 0 && host_key != NULL) {
1494: sshkey_free(previous_host_key);
1495: r = sshkey_from_private(host_key, &previous_host_key);
1.250 djm 1496: }
1497:
1498: return r;
1.51 markus 1499: }
1.70 markus 1500:
1.51 markus 1501: /*
1502: * Starts a dialog with the server, and authenticates the current user on the
1503: * server. This does not need any extra privileges. The basic connection
1504: * to the server must already have been established before this is called.
1505: * If login fails, this function prints an error and never returns.
1506: * This function does not require super-user privileges.
1507: */
1508: void
1.309 djm 1509: ssh_login(struct ssh *ssh, Sensitive *sensitive, const char *orighost,
1.348 djm 1510: struct sockaddr *hostaddr, u_short port, struct passwd *pw, int timeout_ms,
1511: const struct ssh_conn_info *cinfo)
1.51 markus 1512: {
1.241 djm 1513: char *host;
1.70 markus 1514: char *server_user, *local_user;
1.329 djm 1515: int r;
1.70 markus 1516:
1517: local_user = xstrdup(pw->pw_name);
1518: server_user = options.user ? options.user : local_user;
1.51 markus 1519:
1520: /* Convert the user-supplied hostname into all lowercase. */
1521: host = xstrdup(orighost);
1.241 djm 1522: lowercase(host);
1.51 markus 1523:
1524: /* Exchange protocol version identification strings with the server. */
1.329 djm 1525: if ((r = kex_exchange_identification(ssh, timeout_ms, NULL)) != 0)
1526: sshpkt_fatal(ssh, r, "banner exchange");
1.51 markus 1527:
1528: /* Put the connection into non-blocking mode. */
1.309 djm 1529: ssh_packet_set_nonblocking(ssh);
1.51 markus 1530:
1531: /* key exchange */
1532: /* authenticate user */
1.261 dtucker 1533: debug("Authenticating to %s:%d as '%s'", host, port, server_user);
1.348 djm 1534: ssh_kex2(ssh, host, hostaddr, port, cinfo);
1.309 djm 1535: ssh_userauth2(ssh, local_user, server_user, host, sensitive);
1.238 djm 1536: free(local_user);
1.315 dtucker 1537: free(host);
1.132 markus 1538: }
1539:
1540: /* print all known host keys for a given host, but skip keys of given type */
1541: static int
1.279 markus 1542: show_other_keys(struct hostkeys *hostkeys, struct sshkey *key)
1.132 markus 1543: {
1.242 djm 1544: int type[] = {
1545: KEY_RSA,
1546: KEY_DSA,
1547: KEY_ECDSA,
1548: KEY_ED25519,
1.297 markus 1549: KEY_XMSS,
1.242 djm 1550: -1
1551: };
1.229 djm 1552: int i, ret = 0;
1553: char *fp, *ra;
1554: const struct hostkey_entry *found;
1.132 markus 1555:
1556: for (i = 0; type[i] != -1; i++) {
1557: if (type[i] == key->type)
1558: continue;
1.335 djm 1559: if (!lookup_key_in_hostkeys_by_type(hostkeys, type[i],
1560: -1, &found))
1.132 markus 1561: continue;
1.259 djm 1562: fp = sshkey_fingerprint(found->key,
1.254 djm 1563: options.fingerprint_hash, SSH_FP_DEFAULT);
1.259 djm 1564: ra = sshkey_fingerprint(found->key,
1.254 djm 1565: options.fingerprint_hash, SSH_FP_RANDOMART);
1.259 djm 1566: if (fp == NULL || ra == NULL)
1.341 djm 1567: fatal_f("sshkey_fingerprint fail");
1.229 djm 1568: logit("WARNING: %s key found for host %s\n"
1569: "in %s:%lu\n"
1570: "%s key fingerprint %s.",
1.300 markus 1571: sshkey_type(found->key),
1.229 djm 1572: found->host, found->file, found->line,
1.300 markus 1573: sshkey_type(found->key), fp);
1.229 djm 1574: if (options.visual_host_key)
1575: logit("%s", ra);
1.238 djm 1576: free(ra);
1577: free(fp);
1.229 djm 1578: ret = 1;
1.132 markus 1579: }
1.229 djm 1580: return ret;
1.150 jakob 1581: }
1582:
1583: static void
1.279 markus 1584: warn_changed_key(struct sshkey *host_key)
1.150 jakob 1585: {
1586: char *fp;
1587:
1.259 djm 1588: fp = sshkey_fingerprint(host_key, options.fingerprint_hash,
1.254 djm 1589: SSH_FP_DEFAULT);
1.259 djm 1590: if (fp == NULL)
1.341 djm 1591: fatal_f("sshkey_fingerprint fail");
1.150 jakob 1592:
1593: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1594: error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @");
1595: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1596: error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!");
1597: error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!");
1.230 markus 1598: error("It is also possible that a host key has just been changed.");
1.150 jakob 1599: error("The fingerprint for the %s key sent by the remote host is\n%s.",
1.300 markus 1600: sshkey_type(host_key), fp);
1.150 jakob 1601: error("Please contact your system administrator.");
1602:
1.238 djm 1603: free(fp);
1.171 reyk 1604: }
1605:
1606: /*
1607: * Execute a local command
1608: */
1609: int
1610: ssh_local_cmd(const char *args)
1611: {
1612: char *shell;
1613: pid_t pid;
1614: int status;
1.231 djm 1615: void (*osighand)(int);
1.171 reyk 1616:
1617: if (!options.permit_local_command ||
1618: args == NULL || !*args)
1619: return (1);
1620:
1.226 djm 1621: if ((shell = getenv("SHELL")) == NULL || *shell == '\0')
1.171 reyk 1622: shell = _PATH_BSHELL;
1623:
1.327 dtucker 1624: osighand = ssh_signal(SIGCHLD, SIG_DFL);
1.171 reyk 1625: pid = fork();
1626: if (pid == 0) {
1.327 dtucker 1627: ssh_signal(SIGPIPE, SIG_DFL);
1.171 reyk 1628: debug3("Executing %s -c \"%s\"", shell, args);
1629: execl(shell, shell, "-c", args, (char *)NULL);
1630: error("Couldn't execute %s -c \"%s\": %s",
1631: shell, args, strerror(errno));
1632: _exit(1);
1633: } else if (pid == -1)
1634: fatal("fork failed: %.100s", strerror(errno));
1635: while (waitpid(pid, &status, 0) == -1)
1636: if (errno != EINTR)
1637: fatal("Couldn't wait for child: %s", strerror(errno));
1.327 dtucker 1638: ssh_signal(SIGCHLD, osighand);
1.171 reyk 1639:
1640: if (!WIFEXITED(status))
1641: return (1);
1642:
1643: return (WEXITSTATUS(status));
1.266 jcs 1644: }
1645:
1646: void
1.328 djm 1647: maybe_add_key_to_agent(const char *authfile, struct sshkey *private,
1648: const char *comment, const char *passphrase)
1.266 jcs 1649: {
1650: int auth_sock = -1, r;
1.321 djm 1651: const char *skprovider = NULL;
1.266 jcs 1652:
1653: if (options.add_keys_to_agent == 0)
1654: return;
1655:
1656: if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) {
1657: debug3("no authentication agent, not adding key");
1658: return;
1659: }
1660:
1661: if (options.add_keys_to_agent == 2 &&
1662: !ask_permission("Add key %s (%s) to agent?", authfile, comment)) {
1663: debug3("user denied adding this key");
1.273 dtucker 1664: close(auth_sock);
1.266 jcs 1665: return;
1666: }
1.322 markus 1667: if (sshkey_is_sk(private))
1.321 djm 1668: skprovider = options.sk_provider;
1.328 djm 1669: if ((r = ssh_add_identity_constrained(auth_sock, private,
1.331 djm 1670: comment == NULL ? authfile : comment,
1671: options.add_keys_to_agent_lifespan,
1.321 djm 1672: (options.add_keys_to_agent == 3), 0, skprovider)) == 0)
1.266 jcs 1673: debug("identity added to agent: %s", authfile);
1674: else
1675: debug("could not add identity to agent: %s (%d)", authfile, r);
1.273 dtucker 1676: close(auth_sock);
1.1 deraadt 1677: }
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