1 /* $OpenBSD: sshconnect.c,v 1.187 2006/07/05 02:42:09 stevesk Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * Code to connect to a remote host, and to perform the client side of the
7 * login (authentication) dialog.
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".
18 #include <sys/types.h>
21 #include <sys/socket.h>
23 #include <netinet/in.h>
38 #include "sshconnect.h"
47 char *client_version_string = NULL;
48 char *server_version_string = NULL;
50 static int matching_host_key_dns = 0;
53 extern Options options;
54 extern char *__progname;
55 extern uid_t original_real_uid;
56 extern uid_t original_effective_uid;
57 extern pid_t proxy_command_pid;
59 #ifndef INET6_ADDRSTRLEN /* for non IPv6 machines */
60 #define INET6_ADDRSTRLEN 46
63 static int show_other_keys(const char *, Key *);
64 static void warn_changed_key(Key *);
67 * Connect to the given ssh server using a proxy command.
70 ssh_proxy_connect(const char *host, u_short port, const char *proxy_command)
72 char *command_string, *tmp;
75 char strport[NI_MAXSERV];
77 /* Convert the port number into a string. */
78 snprintf(strport, sizeof strport, "%hu", port);
81 * Build the final command string in the buffer by making the
82 * appropriate substitutions to the given proxy command.
84 * Use "exec" to avoid "sh -c" processes on some platforms
87 xasprintf(&tmp, "exec %s", proxy_command);
88 command_string = percent_expand(tmp, "h", host,
89 "p", strport, (char *)NULL);
92 /* Create pipes for communicating with the proxy. */
93 if (pipe(pin) < 0 || pipe(pout) < 0)
94 fatal("Could not create pipes to communicate with the proxy: %.100s",
97 debug("Executing proxy command: %.500s", command_string);
99 /* Fork and execute the proxy command. */
100 if ((pid = fork()) == 0) {
103 /* Child. Permanently give up superuser privileges. */
104 permanently_drop_suid(original_real_uid);
106 /* Redirect stdin and stdout. */
109 if (dup2(pin[0], 0) < 0)
110 perror("dup2 stdin");
114 if (dup2(pout[1], 1) < 0)
115 perror("dup2 stdout");
116 /* Cannot be 1 because pin allocated two descriptors. */
119 /* Stderr is left as it is so that error messages get
120 printed on the user's terminal. */
121 argv[0] = _PATH_BSHELL;
123 argv[2] = command_string;
126 /* Execute the proxy command. Note that we gave up any
127 extra privileges above. */
128 execv(argv[0], argv);
134 fatal("fork failed: %.100s", strerror(errno));
136 proxy_command_pid = pid; /* save pid to clean up later */
138 /* Close child side of the descriptors. */
142 /* Free the command name. */
143 xfree(command_string);
145 /* Set the connection file descriptors. */
146 packet_set_connection(pout[0], pin[1]);
148 /* Indicate OK return */
153 * Creates a (possibly privileged) socket for use as the ssh connection.
156 ssh_create_socket(int privileged, struct addrinfo *ai)
159 struct addrinfo hints, *res;
162 * If we are running as root and want to connect to a privileged
163 * port, bind our own socket to a privileged port.
166 int p = IPPORT_RESERVED - 1;
168 sock = rresvport_af(&p, ai->ai_family);
171 error("rresvport: af=%d %.100s", ai->ai_family,
174 debug("Allocated local port %d.", p);
177 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
179 error("socket: %.100s", strerror(errno));
181 /* Bind the socket to an alternative local IP address */
182 if (options.bind_address == NULL)
185 memset(&hints, 0, sizeof(hints));
186 hints.ai_family = ai->ai_family;
187 hints.ai_socktype = ai->ai_socktype;
188 hints.ai_protocol = ai->ai_protocol;
189 hints.ai_flags = AI_PASSIVE;
190 gaierr = getaddrinfo(options.bind_address, "0", &hints, &res);
192 error("getaddrinfo: %s: %s", options.bind_address,
193 gai_strerror(gaierr));
197 if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) {
198 error("bind: %s: %s", options.bind_address, strerror(errno));
208 timeout_connect(int sockfd, const struct sockaddr *serv_addr,
209 socklen_t addrlen, int timeout)
214 int optval, rc, result = -1;
217 return (connect(sockfd, serv_addr, addrlen));
219 set_nonblock(sockfd);
220 rc = connect(sockfd, serv_addr, addrlen);
222 unset_nonblock(sockfd);
225 if (errno != EINPROGRESS)
228 fdset = (fd_set *)xcalloc(howmany(sockfd + 1, NFDBITS),
230 FD_SET(sockfd, fdset);
235 rc = select(sockfd + 1, NULL, fdset, NULL, &tv);
236 if (rc != -1 || errno != EINTR)
247 debug("select: %s", strerror(errno));
250 /* Completed or failed */
252 optlen = sizeof(optval);
253 if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval,
255 debug("getsockopt: %s", strerror(errno));
263 unset_nonblock(sockfd);
266 /* Should not occur */
267 fatal("Bogus return (%d) from select()", rc);
275 * Opens a TCP/IP connection to the remote server on the given host.
276 * The address of the remote host will be returned in hostaddr.
277 * If port is 0, the default port will be used. If needpriv is true,
278 * a privileged port will be allocated to make the connection.
279 * This requires super-user privileges if needpriv is true.
280 * Connection_attempts specifies the maximum number of tries (one per
281 * second). If proxy_command is non-NULL, it specifies the command (with %h
282 * and %p substituted for host and port, respectively) to use to contact
286 ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
287 u_short port, int family, int connection_attempts,
288 int needpriv, const char *proxy_command)
292 int sock = -1, attempt;
293 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
294 struct addrinfo hints, *ai, *aitop;
296 debug2("ssh_connect: needpriv %d", needpriv);
298 /* If a proxy command is given, connect using it. */
299 if (proxy_command != NULL)
300 return ssh_proxy_connect(host, port, proxy_command);
302 /* No proxy command. */
304 memset(&hints, 0, sizeof(hints));
305 hints.ai_family = family;
306 hints.ai_socktype = SOCK_STREAM;
307 snprintf(strport, sizeof strport, "%u", port);
308 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
309 fatal("%s: %.100s: %s", __progname, host,
310 gai_strerror(gaierr));
312 for (attempt = 0; attempt < connection_attempts; attempt++) {
314 debug("Trying again...");
317 * Loop through addresses for this host, and try each one in
318 * sequence until the connection succeeds.
320 for (ai = aitop; ai; ai = ai->ai_next) {
321 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
323 if (getnameinfo(ai->ai_addr, ai->ai_addrlen,
324 ntop, sizeof(ntop), strport, sizeof(strport),
325 NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
326 error("ssh_connect: getnameinfo failed");
329 debug("Connecting to %.200s [%.100s] port %s.",
330 host, ntop, strport);
332 /* Create a socket for connecting. */
333 sock = ssh_create_socket(needpriv, ai);
335 /* Any error is already output */
338 if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen,
339 options.connection_timeout) >= 0) {
340 /* Successful connection. */
341 memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen);
344 debug("connect to address %s port %s: %s",
345 ntop, strport, strerror(errno));
351 break; /* Successful connection. */
353 /* Sleep a moment before retrying. */
359 /* Return failure if we didn't get a successful connection. */
361 error("ssh: connect to host %s port %s: %s",
362 host, strport, strerror(errno));
366 debug("Connection established.");
368 /* Set SO_KEEPALIVE if requested. */
369 if (options.tcp_keep_alive &&
370 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on,
372 error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
374 /* Set the connection. */
375 packet_set_connection(sock, sock);
381 * Waits for the server identification string, and sends our own
382 * identification string.
385 ssh_exchange_identification(void)
387 char buf[256], remote_version[256]; /* must be same size! */
388 int remote_major, remote_minor, mismatch;
389 int connection_in = packet_get_connection_in();
390 int connection_out = packet_get_connection_out();
391 int minor1 = PROTOCOL_MINOR_1;
394 /* Read other side's version identification. */
396 for (i = 0; i < sizeof(buf) - 1; i++) {
397 size_t len = atomicio(read, connection_in, &buf[i], 1);
399 if (len != 1 && errno == EPIPE)
400 fatal("ssh_exchange_identification: Connection closed by remote host");
402 fatal("ssh_exchange_identification: read: %.100s", strerror(errno));
403 if (buf[i] == '\r') {
406 continue; /**XXX wait for \n */
408 if (buf[i] == '\n') {
413 fatal("ssh_exchange_identification: No banner received");
415 buf[sizeof(buf) - 1] = 0;
416 if (strncmp(buf, "SSH-", 4) == 0)
418 debug("ssh_exchange_identification: %s", buf);
420 server_version_string = xstrdup(buf);
423 * Check that the versions match. In future this might accept
424 * several versions and set appropriate flags to handle them.
426 if (sscanf(server_version_string, "SSH-%d.%d-%[^\n]\n",
427 &remote_major, &remote_minor, remote_version) != 3)
428 fatal("Bad remote protocol version identification: '%.100s'", buf);
429 debug("Remote protocol version %d.%d, remote software version %.100s",
430 remote_major, remote_minor, remote_version);
432 compat_datafellows(remote_version);
435 switch (remote_major) {
437 if (remote_minor == 99 &&
438 (options.protocol & SSH_PROTO_2) &&
439 !(options.protocol & SSH_PROTO_1_PREFERRED)) {
443 if (!(options.protocol & SSH_PROTO_1)) {
447 if (remote_minor < 3) {
448 fatal("Remote machine has too old SSH software version.");
449 } else if (remote_minor == 3 || remote_minor == 4) {
450 /* We speak 1.3, too. */
453 if (options.forward_agent) {
454 logit("Agent forwarding disabled for protocol 1.3");
455 options.forward_agent = 0;
460 if (options.protocol & SSH_PROTO_2) {
470 fatal("Protocol major versions differ: %d vs. %d",
471 (options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1,
473 /* Send our own protocol version identification. */
474 snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n",
475 compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1,
476 compat20 ? PROTOCOL_MINOR_2 : minor1,
478 if (atomicio(vwrite, connection_out, buf, strlen(buf)) != strlen(buf))
479 fatal("write: %.100s", strerror(errno));
480 client_version_string = xstrdup(buf);
481 chop(client_version_string);
482 chop(server_version_string);
483 debug("Local version string %.100s", client_version_string);
486 /* defaults to 'no' */
488 confirm(const char *prompt)
490 const char *msg, *again = "Please type 'yes' or 'no': ";
494 if (options.batch_mode)
496 for (msg = prompt;;msg = again) {
497 p = read_passphrase(msg, RP_ECHO);
499 (p[0] == '\0') || (p[0] == '\n') ||
500 strncasecmp(p, "no", 2) == 0)
502 if (p && strncasecmp(p, "yes", 3) == 0)
512 * check whether the supplied host key is valid, return -1 if the key
513 * is not valid. the user_hostfile will not be updated if 'readonly' is true.
516 check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
517 int readonly, const char *user_hostfile, const char *system_hostfile)
520 const char *type = key_type(host_key);
522 char hostline[1000], *hostp, *fp;
523 HostStatus host_status;
524 HostStatus ip_status;
525 int r, local = 0, host_ip_differ = 0;
527 char ntop[NI_MAXHOST];
529 int len, host_line, ip_line;
530 const char *host_file = NULL, *ip_file = NULL;
533 * Force accepting of the host key for loopback/localhost. The
534 * problem is that if the home directory is NFS-mounted to multiple
535 * machines, localhost will refer to a different machine in each of
536 * them, and the user will get bogus HOST_CHANGED warnings. This
537 * essentially disables host authentication for localhost; however,
538 * this is probably not a real problem.
540 /** hostaddr == 0! */
541 switch (hostaddr->sa_family) {
543 local = (ntohl(((struct sockaddr_in *)hostaddr)->
544 sin_addr.s_addr) >> 24) == IN_LOOPBACKNET;
545 salen = sizeof(struct sockaddr_in);
548 local = IN6_IS_ADDR_LOOPBACK(
549 &(((struct sockaddr_in6 *)hostaddr)->sin6_addr));
550 salen = sizeof(struct sockaddr_in6);
554 salen = sizeof(struct sockaddr_storage);
557 if (options.no_host_authentication_for_localhost == 1 && local &&
558 options.host_key_alias == NULL) {
559 debug("Forcing accepting of host key for "
560 "loopback/localhost.");
565 * We don't have the remote ip-address for connections
566 * using a proxy command
568 if (options.proxy_command == NULL) {
569 if (getnameinfo(hostaddr, salen, ntop, sizeof(ntop),
570 NULL, 0, NI_NUMERICHOST) != 0)
571 fatal("check_host_key: getnameinfo failed");
574 ip = xstrdup("<no hostip for proxy command>");
577 * Turn off check_host_ip if the connection is to localhost, via proxy
578 * command or if we don't have a hostname to compare with
580 if (options.check_host_ip &&
581 (local || strcmp(host, ip) == 0 || options.proxy_command != NULL))
582 options.check_host_ip = 0;
585 * Allow the user to record the key under a different name. This is
586 * useful for ssh tunneling over forwarded connections or if you run
587 * multiple sshd's on different ports on the same machine.
589 if (options.host_key_alias != NULL) {
590 host = options.host_key_alias;
591 debug("using hostkeyalias: %s", host);
595 * Store the host key from the known host file in here so that we can
596 * compare it with the key for the IP address.
598 file_key = key_new(host_key->type);
601 * Check if the host key is present in the user's list of known
602 * hosts or in the systemwide list.
604 host_file = user_hostfile;
605 host_status = check_host_in_hostfile(host_file, host, host_key,
606 file_key, &host_line);
607 if (host_status == HOST_NEW) {
608 host_file = system_hostfile;
609 host_status = check_host_in_hostfile(host_file, host, host_key,
610 file_key, &host_line);
613 * Also perform check for the ip address, skip the check if we are
614 * localhost or the hostname was an ip address to begin with
616 if (options.check_host_ip) {
617 Key *ip_key = key_new(host_key->type);
619 ip_file = user_hostfile;
620 ip_status = check_host_in_hostfile(ip_file, ip, host_key,
622 if (ip_status == HOST_NEW) {
623 ip_file = system_hostfile;
624 ip_status = check_host_in_hostfile(ip_file, ip,
625 host_key, ip_key, &ip_line);
627 if (host_status == HOST_CHANGED &&
628 (ip_status != HOST_CHANGED || !key_equal(ip_key, file_key)))
633 ip_status = host_status;
637 switch (host_status) {
639 /* The host is known and the key matches. */
640 debug("Host '%.200s' is known and matches the %s host key.",
642 debug("Found key in %s:%d", host_file, host_line);
643 if (options.check_host_ip && ip_status == HOST_NEW) {
645 logit("%s host key for IP address "
646 "'%.128s' not in list of known hosts.",
648 else if (!add_host_to_hostfile(user_hostfile, ip,
649 host_key, options.hash_known_hosts))
650 logit("Failed to add the %s host key for IP "
651 "address '%.128s' to the list of known "
652 "hosts (%.30s).", type, ip, user_hostfile);
654 logit("Warning: Permanently added the %s host "
655 "key for IP address '%.128s' to the list "
656 "of known hosts.", type, ip);
662 /* The host is new. */
663 if (options.strict_host_key_checking == 1) {
665 * User has requested strict host key checking. We
666 * will not add the host key automatically. The only
667 * alternative left is to abort.
669 error("No %s host key is known for %.200s and you "
670 "have requested strict checking.", type, host);
672 } else if (options.strict_host_key_checking == 2) {
673 char msg1[1024], msg2[1024];
675 if (show_other_keys(host, host_key))
676 snprintf(msg1, sizeof(msg1),
677 "\nbut keys of different type are already"
678 " known for this host.");
680 snprintf(msg1, sizeof(msg1), ".");
682 fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX);
684 if (options.verify_host_key_dns) {
685 if (matching_host_key_dns)
686 snprintf(msg2, sizeof(msg2),
687 "Matching host key fingerprint"
690 snprintf(msg2, sizeof(msg2),
691 "No matching host key fingerprint"
694 snprintf(msg, sizeof(msg),
695 "The authenticity of host '%.200s (%s)' can't be "
697 "%s key fingerprint is %s.\n%s"
698 "Are you sure you want to continue connecting "
700 host, ip, msg1, type, fp, msg2);
706 * If not in strict mode, add the key automatically to the
707 * local known_hosts file.
709 if (options.check_host_ip && ip_status == HOST_NEW) {
710 snprintf(hostline, sizeof(hostline), "%s,%s",
713 if (options.hash_known_hosts) {
714 /* Add hash of host and IP separately */
715 r = add_host_to_hostfile(user_hostfile, host,
716 host_key, options.hash_known_hosts) &&
717 add_host_to_hostfile(user_hostfile, ip,
718 host_key, options.hash_known_hosts);
720 /* Add unhashed "host,ip" */
721 r = add_host_to_hostfile(user_hostfile,
723 options.hash_known_hosts);
726 r = add_host_to_hostfile(user_hostfile, host, host_key,
727 options.hash_known_hosts);
732 logit("Failed to add the host to the list of known "
733 "hosts (%.500s).", user_hostfile);
735 logit("Warning: Permanently added '%.200s' (%s) to the "
736 "list of known hosts.", hostp, type);
739 if (options.check_host_ip && host_ip_differ) {
741 if (ip_status == HOST_NEW)
742 key_msg = "is unknown";
743 else if (ip_status == HOST_OK)
744 key_msg = "is unchanged";
746 key_msg = "has a different value";
747 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
748 error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @");
749 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
750 error("The %s host key for %s has changed,", type, host);
751 error("and the key for the according IP address %s", ip);
752 error("%s. This could either mean that", key_msg);
753 error("DNS SPOOFING is happening or the IP address for the host");
754 error("and its host key have changed at the same time.");
755 if (ip_status != HOST_NEW)
756 error("Offending key for IP in %s:%d", ip_file, ip_line);
758 /* The host key has changed. */
759 warn_changed_key(host_key);
760 error("Add correct host key in %.100s to get rid of this message.",
762 error("Offending key in %s:%d", host_file, host_line);
765 * If strict host key checking is in use, the user will have
766 * to edit the key manually and we can only abort.
768 if (options.strict_host_key_checking) {
769 error("%s host key for %.200s has changed and you have "
770 "requested strict checking.", type, host);
775 * If strict host key checking has not been requested, allow
776 * the connection but without MITM-able authentication or
779 if (options.password_authentication) {
780 error("Password authentication is disabled to avoid "
781 "man-in-the-middle attacks.");
782 options.password_authentication = 0;
784 if (options.kbd_interactive_authentication) {
785 error("Keyboard-interactive authentication is disabled"
786 " to avoid man-in-the-middle attacks.");
787 options.kbd_interactive_authentication = 0;
788 options.challenge_response_authentication = 0;
790 if (options.challenge_response_authentication) {
791 error("Challenge/response authentication is disabled"
792 " to avoid man-in-the-middle attacks.");
793 options.challenge_response_authentication = 0;
795 if (options.forward_agent) {
796 error("Agent forwarding is disabled to avoid "
797 "man-in-the-middle attacks.");
798 options.forward_agent = 0;
800 if (options.forward_x11) {
801 error("X11 forwarding is disabled to avoid "
802 "man-in-the-middle attacks.");
803 options.forward_x11 = 0;
805 if (options.num_local_forwards > 0 ||
806 options.num_remote_forwards > 0) {
807 error("Port forwarding is disabled to avoid "
808 "man-in-the-middle attacks.");
809 options.num_local_forwards =
810 options.num_remote_forwards = 0;
813 * XXX Should permit the user to change to use the new id.
814 * This could be done by converting the host key to an
815 * identifying sentence, tell that the host identifies itself
816 * by that sentence, and ask the user if he/she whishes to
817 * accept the authentication.
821 fatal("internal error");
825 if (options.check_host_ip && host_status != HOST_CHANGED &&
826 ip_status == HOST_CHANGED) {
827 snprintf(msg, sizeof(msg),
828 "Warning: the %s host key for '%.200s' "
829 "differs from the key for the IP address '%.128s'"
830 "\nOffending key for IP in %s:%d",
831 type, host, ip, ip_file, ip_line);
832 if (host_status == HOST_OK) {
834 snprintf(msg + len, sizeof(msg) - len,
835 "\nMatching host key in %s:%d",
836 host_file, host_line);
838 if (options.strict_host_key_checking == 1) {
840 error("Exiting, you have requested strict checking.");
842 } else if (options.strict_host_key_checking == 2) {
843 strlcat(msg, "\nAre you sure you want "
844 "to continue connecting (yes/no)? ", sizeof(msg));
860 /* returns 0 if key verifies or -1 if key does NOT verify */
862 verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key)
867 if (options.verify_host_key_dns &&
868 verify_host_key_dns(host, hostaddr, host_key, &flags) == 0) {
870 if (flags & DNS_VERIFY_FOUND) {
872 if (options.verify_host_key_dns == 1 &&
873 flags & DNS_VERIFY_MATCH &&
874 flags & DNS_VERIFY_SECURE)
877 if (flags & DNS_VERIFY_MATCH) {
878 matching_host_key_dns = 1;
880 warn_changed_key(host_key);
881 error("Update the SSHFP RR in DNS with the new "
882 "host key to get rid of this message.");
887 /* return ok if the key can be found in an old keyfile */
888 if (stat(options.system_hostfile2, &st) == 0 ||
889 stat(options.user_hostfile2, &st) == 0) {
890 if (check_host_key(host, hostaddr, host_key, /*readonly*/ 1,
891 options.user_hostfile2, options.system_hostfile2) == 0)
894 return check_host_key(host, hostaddr, host_key, /*readonly*/ 0,
895 options.user_hostfile, options.system_hostfile);
899 * Starts a dialog with the server, and authenticates the current user on the
900 * server. This does not need any extra privileges. The basic connection
901 * to the server must already have been established before this is called.
902 * If login fails, this function prints an error and never returns.
903 * This function does not require super-user privileges.
906 ssh_login(Sensitive *sensitive, const char *orighost,
907 struct sockaddr *hostaddr, struct passwd *pw)
910 char *server_user, *local_user;
912 local_user = xstrdup(pw->pw_name);
913 server_user = options.user ? options.user : local_user;
915 /* Convert the user-supplied hostname into all lowercase. */
916 host = xstrdup(orighost);
917 for (cp = host; *cp; cp++)
919 *cp = (char)tolower(*cp);
921 /* Exchange protocol version identification strings with the server. */
922 ssh_exchange_identification();
924 /* Put the connection into non-blocking mode. */
925 packet_set_nonblocking();
928 /* authenticate user */
930 ssh_kex2(host, hostaddr);
931 ssh_userauth2(local_user, server_user, host, sensitive);
933 ssh_kex(host, hostaddr);
934 ssh_userauth1(local_user, server_user, host, sensitive);
940 ssh_put_password(char *password)
945 if (datafellows & SSH_BUG_PASSWORDPAD) {
946 packet_put_cstring(password);
949 size = roundup(strlen(password) + 1, 32);
950 padded = xcalloc(1, size);
951 strlcpy(padded, password, size);
952 packet_put_string(padded, size);
953 memset(padded, 0, size);
958 show_key_from_file(const char *file, const char *host, int keytype)
964 found = key_new(keytype);
965 if ((ret = lookup_key_in_hostfile_by_type(file, host,
966 keytype, found, &line))) {
967 fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX);
968 logit("WARNING: %s key found for host %s\n"
970 "%s key fingerprint %s.",
971 key_type(found), host, file, line,
972 key_type(found), fp);
979 /* print all known host keys for a given host, but skip keys of given type */
981 show_other_keys(const char *host, Key *key)
983 int type[] = { KEY_RSA1, KEY_RSA, KEY_DSA, -1};
986 for (i = 0; type[i] != -1; i++) {
987 if (type[i] == key->type)
989 if (type[i] != KEY_RSA1 &&
990 show_key_from_file(options.user_hostfile2, host, type[i])) {
994 if (type[i] != KEY_RSA1 &&
995 show_key_from_file(options.system_hostfile2, host, type[i])) {
999 if (show_key_from_file(options.user_hostfile, host, type[i])) {
1003 if (show_key_from_file(options.system_hostfile, host, type[i])) {
1007 debug2("no key of type %d for host %s", type[i], host);
1013 warn_changed_key(Key *host_key)
1016 const char *type = key_type(host_key);
1018 fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX);
1020 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1021 error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @");
1022 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1023 error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!");
1024 error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!");
1025 error("It is also possible that the %s host key has just been changed.", type);
1026 error("The fingerprint for the %s key sent by the remote host is\n%s.",
1028 error("Please contact your system administrator.");
1034 * Execute a local command
1037 ssh_local_cmd(const char *args)
1043 if (!options.permit_local_command ||
1044 args == NULL || !*args)
1047 if ((shell = getenv("SHELL")) == NULL)
1048 shell = _PATH_BSHELL;
1052 debug3("Executing %s -c \"%s\"", shell, args);
1053 execl(shell, shell, "-c", args, (char *)NULL);
1054 error("Couldn't execute %s -c \"%s\": %s",
1055 shell, args, strerror(errno));
1057 } else if (pid == -1)
1058 fatal("fork failed: %.100s", strerror(errno));
1059 while (waitpid(pid, &status, 0) == -1)
1061 fatal("Couldn't wait for child: %s", strerror(errno));
1063 if (!WIFEXITED(status))
1066 return (WEXITSTATUS(status));