2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * Code to connect to a remote host, and to perform the client side of the
6 * login (authentication) dialog.
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
16 RCSID("$OpenBSD: sshconnect.c,v 1.144 2003/06/04 08:25:18 djm Exp $");
18 #include <openssl/bn.h>
28 #include "sshconnect.h"
40 char *client_version_string = NULL;
41 char *server_version_string = NULL;
44 extern Options options;
45 extern char *__progname;
46 extern uid_t original_real_uid;
47 extern uid_t original_effective_uid;
48 extern pid_t proxy_command_pid;
50 #ifndef INET6_ADDRSTRLEN /* for non IPv6 machines */
51 #define INET6_ADDRSTRLEN 46
54 static int show_other_keys(const char *, Key *);
57 * Connect to the given ssh server using a proxy command.
60 ssh_proxy_connect(const char *host, u_short port, const char *proxy_command)
67 char strport[NI_MAXSERV];
69 /* Convert the port number into a string. */
70 snprintf(strport, sizeof strport, "%hu", port);
73 * Build the final command string in the buffer by making the
74 * appropriate substitutions to the given proxy command.
76 * Use "exec" to avoid "sh -c" processes on some platforms
79 buffer_init(&command);
80 buffer_append(&command, "exec ", 5);
82 for (cp = proxy_command; *cp; cp++) {
83 if (cp[0] == '%' && cp[1] == '%') {
84 buffer_append(&command, "%", 1);
88 if (cp[0] == '%' && cp[1] == 'h') {
89 buffer_append(&command, host, strlen(host));
93 if (cp[0] == '%' && cp[1] == 'p') {
94 buffer_append(&command, strport, strlen(strport));
98 buffer_append(&command, cp, 1);
100 buffer_append(&command, "\0", 1);
102 /* Get the final command string. */
103 command_string = buffer_ptr(&command);
105 /* Create pipes for communicating with the proxy. */
106 if (pipe(pin) < 0 || pipe(pout) < 0)
107 fatal("Could not create pipes to communicate with the proxy: %.100s",
110 debug("Executing proxy command: %.500s", command_string);
112 /* Fork and execute the proxy command. */
113 if ((pid = fork()) == 0) {
116 /* Child. Permanently give up superuser privileges. */
117 seteuid(original_real_uid);
118 setuid(original_real_uid);
120 /* Redirect stdin and stdout. */
123 if (dup2(pin[0], 0) < 0)
124 perror("dup2 stdin");
128 if (dup2(pout[1], 1) < 0)
129 perror("dup2 stdout");
130 /* Cannot be 1 because pin allocated two descriptors. */
133 /* Stderr is left as it is so that error messages get
134 printed on the user's terminal. */
135 argv[0] = _PATH_BSHELL;
137 argv[2] = command_string;
140 /* Execute the proxy command. Note that we gave up any
141 extra privileges above. */
142 execv(argv[0], argv);
148 fatal("fork failed: %.100s", strerror(errno));
150 proxy_command_pid = pid; /* save pid to clean up later */
152 /* Close child side of the descriptors. */
156 /* Free the command name. */
157 buffer_free(&command);
159 /* Set the connection file descriptors. */
160 packet_set_connection(pout[0], pin[1]);
162 /* Indicate OK return */
167 * Creates a (possibly privileged) socket for use as the ssh connection.
170 ssh_create_socket(int privileged, struct addrinfo *ai)
173 struct addrinfo hints, *res;
176 * If we are running as root and want to connect to a privileged
177 * port, bind our own socket to a privileged port.
180 int p = IPPORT_RESERVED - 1;
182 sock = rresvport_af(&p, ai->ai_family);
185 error("rresvport: af=%d %.100s", ai->ai_family,
188 debug("Allocated local port %d.", p);
191 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
193 error("socket: %.100s", strerror(errno));
195 /* Bind the socket to an alternative local IP address */
196 if (options.bind_address == NULL)
199 memset(&hints, 0, sizeof(hints));
200 hints.ai_family = ai->ai_family;
201 hints.ai_socktype = ai->ai_socktype;
202 hints.ai_protocol = ai->ai_protocol;
203 hints.ai_flags = AI_PASSIVE;
204 gaierr = getaddrinfo(options.bind_address, "0", &hints, &res);
206 error("getaddrinfo: %s: %s", options.bind_address,
207 gai_strerror(gaierr));
211 if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) {
212 error("bind: %s: %s", options.bind_address, strerror(errno));
222 timeout_connect(int sockfd, const struct sockaddr *serv_addr,
223 socklen_t addrlen, int timeout)
228 int fdsetsz, optval, rc, result = -1;
231 return (connect(sockfd, serv_addr, addrlen));
233 if (fcntl(sockfd, F_SETFL, O_NONBLOCK) < 0)
236 rc = connect(sockfd, serv_addr, addrlen);
239 if (errno != EINPROGRESS)
242 fdsetsz = howmany(sockfd + 1, NFDBITS) * sizeof(fd_mask);
243 fdset = (fd_set *)xmalloc(fdsetsz);
245 memset(fdset, '\0', fdsetsz);
246 FD_SET(sockfd, fdset);
251 rc = select(sockfd + 1, NULL, fdset, NULL, &tv);
252 if (rc != -1 || errno != EINTR)
263 debug("select: %s", strerror(errno));
266 /* Completed or failed */
268 optlen = sizeof(optval);
269 if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval,
271 debug("getsockopt: %s", strerror(errno));
280 /* Should not occur */
281 fatal("Bogus return (%d) from select()", rc);
289 * Opens a TCP/IP connection to the remote server on the given host.
290 * The address of the remote host will be returned in hostaddr.
291 * If port is 0, the default port will be used. If needpriv is true,
292 * a privileged port will be allocated to make the connection.
293 * This requires super-user privileges if needpriv is true.
294 * Connection_attempts specifies the maximum number of tries (one per
295 * second). If proxy_command is non-NULL, it specifies the command (with %h
296 * and %p substituted for host and port, respectively) to use to contact
300 * ECONNREFUSED if we got a "Connection Refused" by the peer on any address
301 * ECONNABORTED if we failed without a "Connection refused"
302 * Suitable error messages for the connection failure will already have been
306 ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
307 u_short port, int family, int connection_attempts,
308 int needpriv, const char *proxy_command)
312 int sock = -1, attempt;
313 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
314 struct addrinfo hints, *ai, *aitop;
317 * Did we get only other errors than "Connection refused" (which
318 * should block fallback to rsh and similar), or did we get at least
319 * one "Connection refused"?
321 int full_failure = 1;
323 debug2("ssh_connect: needpriv %d", needpriv);
325 /* Get default port if port has not been set. */
327 sp = getservbyname(SSH_SERVICE_NAME, "tcp");
329 port = ntohs(sp->s_port);
331 port = SSH_DEFAULT_PORT;
333 /* If a proxy command is given, connect using it. */
334 if (proxy_command != NULL)
335 return ssh_proxy_connect(host, port, proxy_command);
337 /* No proxy command. */
339 memset(&hints, 0, sizeof(hints));
340 hints.ai_family = family;
341 hints.ai_socktype = SOCK_STREAM;
342 snprintf(strport, sizeof strport, "%u", port);
343 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
344 fatal("%s: %.100s: %s", __progname, host,
345 gai_strerror(gaierr));
348 * Try to connect several times. On some machines, the first time
349 * will sometimes fail. In general socket code appears to behave
350 * quite magically on many machines.
352 for (attempt = 0; ;) {
354 debug("Trying again...");
356 /* Loop through addresses for this host, and try each one in
357 sequence until the connection succeeds. */
358 for (ai = aitop; ai; ai = ai->ai_next) {
359 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
361 if (getnameinfo(ai->ai_addr, ai->ai_addrlen,
362 ntop, sizeof(ntop), strport, sizeof(strport),
363 NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
364 error("ssh_connect: getnameinfo failed");
367 debug("Connecting to %.200s [%.100s] port %s.",
368 host, ntop, strport);
370 /* Create a socket for connecting. */
371 sock = ssh_create_socket(needpriv, ai);
373 /* Any error is already output */
376 if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen,
377 options.connection_timeout) >= 0) {
378 /* Successful connection. */
379 memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen);
382 if (errno == ECONNREFUSED)
384 debug("connect to address %s port %s: %s",
385 ntop, strport, strerror(errno));
387 * Close the failed socket; there appear to
388 * be some problems when reusing a socket for
389 * which connect() has already returned an
396 break; /* Successful connection. */
399 if (attempt >= connection_attempts)
401 /* Sleep a moment before retrying. */
407 /* Return failure if we didn't get a successful connection. */
408 if (attempt >= connection_attempts) {
409 logit("ssh: connect to host %s port %s: %s",
410 host, strport, strerror(errno));
411 return full_failure ? ECONNABORTED : ECONNREFUSED;
414 debug("Connection established.");
416 /* Set keepalives if requested. */
417 if (options.keepalives &&
418 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on,
420 error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
422 /* Set the connection. */
423 packet_set_connection(sock, sock);
429 * Waits for the server identification string, and sends our own
430 * identification string.
433 ssh_exchange_identification(void)
435 char buf[256], remote_version[256]; /* must be same size! */
436 int remote_major, remote_minor, i, mismatch;
437 int connection_in = packet_get_connection_in();
438 int connection_out = packet_get_connection_out();
439 int minor1 = PROTOCOL_MINOR_1;
441 /* Read other side\'s version identification. */
443 for (i = 0; i < sizeof(buf) - 1; i++) {
444 int len = atomicio(read, connection_in, &buf[i], 1);
446 fatal("ssh_exchange_identification: read: %.100s", strerror(errno));
448 fatal("ssh_exchange_identification: Connection closed by remote host");
449 if (buf[i] == '\r') {
452 continue; /**XXX wait for \n */
454 if (buf[i] == '\n') {
459 buf[sizeof(buf) - 1] = 0;
460 if (strncmp(buf, "SSH-", 4) == 0)
462 debug("ssh_exchange_identification: %s", buf);
464 server_version_string = xstrdup(buf);
467 * Check that the versions match. In future this might accept
468 * several versions and set appropriate flags to handle them.
470 if (sscanf(server_version_string, "SSH-%d.%d-%[^\n]\n",
471 &remote_major, &remote_minor, remote_version) != 3)
472 fatal("Bad remote protocol version identification: '%.100s'", buf);
473 debug("Remote protocol version %d.%d, remote software version %.100s",
474 remote_major, remote_minor, remote_version);
476 compat_datafellows(remote_version);
479 switch (remote_major) {
481 if (remote_minor == 99 &&
482 (options.protocol & SSH_PROTO_2) &&
483 !(options.protocol & SSH_PROTO_1_PREFERRED)) {
487 if (!(options.protocol & SSH_PROTO_1)) {
491 if (remote_minor < 3) {
492 fatal("Remote machine has too old SSH software version.");
493 } else if (remote_minor == 3 || remote_minor == 4) {
494 /* We speak 1.3, too. */
497 if (options.forward_agent) {
498 logit("Agent forwarding disabled for protocol 1.3");
499 options.forward_agent = 0;
504 if (options.protocol & SSH_PROTO_2) {
514 fatal("Protocol major versions differ: %d vs. %d",
515 (options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1,
517 /* Send our own protocol version identification. */
518 snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n",
519 compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1,
520 compat20 ? PROTOCOL_MINOR_2 : minor1,
522 if (atomicio(write, connection_out, buf, strlen(buf)) != strlen(buf))
523 fatal("write: %.100s", strerror(errno));
524 client_version_string = xstrdup(buf);
525 chop(client_version_string);
526 chop(server_version_string);
527 debug("Local version string %.100s", client_version_string);
530 /* defaults to 'no' */
532 confirm(const char *prompt)
534 const char *msg, *again = "Please type 'yes' or 'no': ";
538 if (options.batch_mode)
540 for (msg = prompt;;msg = again) {
541 p = read_passphrase(msg, RP_ECHO);
543 (p[0] == '\0') || (p[0] == '\n') ||
544 strncasecmp(p, "no", 2) == 0)
546 if (p && strncasecmp(p, "yes", 3) == 0)
556 * check whether the supplied host key is valid, return -1 if the key
557 * is not valid. the user_hostfile will not be updated if 'readonly' is true.
560 check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
561 int readonly, const char *user_hostfile, const char *system_hostfile)
564 char *type = key_type(host_key);
566 char hostline[1000], *hostp, *fp;
567 HostStatus host_status;
568 HostStatus ip_status;
569 int local = 0, host_ip_differ = 0;
571 char ntop[NI_MAXHOST];
573 int len, host_line, ip_line, has_keys;
574 const char *host_file = NULL, *ip_file = NULL;
577 * Force accepting of the host key for loopback/localhost. The
578 * problem is that if the home directory is NFS-mounted to multiple
579 * machines, localhost will refer to a different machine in each of
580 * them, and the user will get bogus HOST_CHANGED warnings. This
581 * essentially disables host authentication for localhost; however,
582 * this is probably not a real problem.
584 /** hostaddr == 0! */
585 switch (hostaddr->sa_family) {
587 local = (ntohl(((struct sockaddr_in *)hostaddr)->
588 sin_addr.s_addr) >> 24) == IN_LOOPBACKNET;
589 salen = sizeof(struct sockaddr_in);
592 local = IN6_IS_ADDR_LOOPBACK(
593 &(((struct sockaddr_in6 *)hostaddr)->sin6_addr));
594 salen = sizeof(struct sockaddr_in6);
598 salen = sizeof(struct sockaddr_storage);
601 if (options.no_host_authentication_for_localhost == 1 && local &&
602 options.host_key_alias == NULL) {
603 debug("Forcing accepting of host key for "
604 "loopback/localhost.");
609 * We don't have the remote ip-address for connections
610 * using a proxy command
612 if (options.proxy_command == NULL) {
613 if (getnameinfo(hostaddr, salen, ntop, sizeof(ntop),
614 NULL, 0, NI_NUMERICHOST) != 0)
615 fatal("check_host_key: getnameinfo failed");
618 ip = xstrdup("<no hostip for proxy command>");
621 * Turn off check_host_ip if the connection is to localhost, via proxy
622 * command or if we don't have a hostname to compare with
624 if (options.check_host_ip &&
625 (local || strcmp(host, ip) == 0 || options.proxy_command != NULL))
626 options.check_host_ip = 0;
629 * Allow the user to record the key under a different name. This is
630 * useful for ssh tunneling over forwarded connections or if you run
631 * multiple sshd's on different ports on the same machine.
633 if (options.host_key_alias != NULL) {
634 host = options.host_key_alias;
635 debug("using hostkeyalias: %s", host);
639 * Store the host key from the known host file in here so that we can
640 * compare it with the key for the IP address.
642 file_key = key_new(host_key->type);
645 * Check if the host key is present in the user\'s list of known
646 * hosts or in the systemwide list.
648 host_file = user_hostfile;
649 host_status = check_host_in_hostfile(host_file, host, host_key,
650 file_key, &host_line);
651 if (host_status == HOST_NEW) {
652 host_file = system_hostfile;
653 host_status = check_host_in_hostfile(host_file, host, host_key,
654 file_key, &host_line);
657 * Also perform check for the ip address, skip the check if we are
658 * localhost or the hostname was an ip address to begin with
660 if (options.check_host_ip) {
661 Key *ip_key = key_new(host_key->type);
663 ip_file = user_hostfile;
664 ip_status = check_host_in_hostfile(ip_file, ip, host_key,
666 if (ip_status == HOST_NEW) {
667 ip_file = system_hostfile;
668 ip_status = check_host_in_hostfile(ip_file, ip,
669 host_key, ip_key, &ip_line);
671 if (host_status == HOST_CHANGED &&
672 (ip_status != HOST_CHANGED || !key_equal(ip_key, file_key)))
677 ip_status = host_status;
681 switch (host_status) {
683 /* The host is known and the key matches. */
684 debug("Host '%.200s' is known and matches the %s host key.",
686 debug("Found key in %s:%d", host_file, host_line);
687 if (options.check_host_ip && ip_status == HOST_NEW) {
689 logit("%s host key for IP address "
690 "'%.128s' not in list of known hosts.",
692 else if (!add_host_to_hostfile(user_hostfile, ip,
694 logit("Failed to add the %s host key for IP "
695 "address '%.128s' to the list of known "
696 "hosts (%.30s).", type, ip, user_hostfile);
698 logit("Warning: Permanently added the %s host "
699 "key for IP address '%.128s' to the list "
700 "of known hosts.", type, ip);
706 /* The host is new. */
707 if (options.strict_host_key_checking == 1) {
709 * User has requested strict host key checking. We
710 * will not add the host key automatically. The only
711 * alternative left is to abort.
713 error("No %s host key is known for %.200s and you "
714 "have requested strict checking.", type, host);
716 } else if (options.strict_host_key_checking == 2) {
717 has_keys = show_other_keys(host, host_key);
719 fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX);
720 snprintf(msg, sizeof(msg),
721 "The authenticity of host '%.200s (%s)' can't be "
723 "%s key fingerprint is %s.\n"
724 "Are you sure you want to continue connecting "
727 has_keys ? ",\nbut keys of different type are already "
728 "known for this host." : ".",
734 if (options.check_host_ip && ip_status == HOST_NEW) {
735 snprintf(hostline, sizeof(hostline), "%s,%s", host, ip);
741 * If not in strict mode, add the key automatically to the
742 * local known_hosts file.
744 if (!add_host_to_hostfile(user_hostfile, hostp, host_key))
745 logit("Failed to add the host to the list of known "
746 "hosts (%.500s).", user_hostfile);
748 logit("Warning: Permanently added '%.200s' (%s) to the "
749 "list of known hosts.", hostp, type);
752 if (options.check_host_ip && host_ip_differ) {
754 if (ip_status == HOST_NEW)
756 else if (ip_status == HOST_OK)
757 msg = "is unchanged";
759 msg = "has a different value";
760 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
761 error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @");
762 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
763 error("The %s host key for %s has changed,", type, host);
764 error("and the key for the according IP address %s", ip);
765 error("%s. This could either mean that", msg);
766 error("DNS SPOOFING is happening or the IP address for the host");
767 error("and its host key have changed at the same time.");
768 if (ip_status != HOST_NEW)
769 error("Offending key for IP in %s:%d", ip_file, ip_line);
771 /* The host key has changed. */
772 fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX);
773 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
774 error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @");
775 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
776 error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!");
777 error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!");
778 error("It is also possible that the %s host key has just been changed.", type);
779 error("The fingerprint for the %s key sent by the remote host is\n%s.",
781 error("Please contact your system administrator.");
782 error("Add correct host key in %.100s to get rid of this message.",
784 error("Offending key in %s:%d", host_file, host_line);
788 * If strict host key checking is in use, the user will have
789 * to edit the key manually and we can only abort.
791 if (options.strict_host_key_checking) {
792 error("%s host key for %.200s has changed and you have "
793 "requested strict checking.", type, host);
798 * If strict host key checking has not been requested, allow
799 * the connection but without MITM-able authentication or
802 if (options.password_authentication) {
803 error("Password authentication is disabled to avoid "
804 "man-in-the-middle attacks.");
805 options.password_authentication = 0;
807 if (options.kbd_interactive_authentication) {
808 error("Keyboard-interactive authentication is disabled"
809 " to avoid man-in-the-middle attacks.");
810 options.kbd_interactive_authentication = 0;
811 options.challenge_response_authentication = 0;
813 if (options.challenge_response_authentication) {
814 error("Challenge/response authentication is disabled"
815 " to avoid man-in-the-middle attacks.");
816 options.challenge_response_authentication = 0;
818 if (options.forward_agent) {
819 error("Agent forwarding is disabled to avoid "
820 "man-in-the-middle attacks.");
821 options.forward_agent = 0;
823 if (options.forward_x11) {
824 error("X11 forwarding is disabled to avoid "
825 "man-in-the-middle attacks.");
826 options.forward_x11 = 0;
828 if (options.num_local_forwards > 0 ||
829 options.num_remote_forwards > 0) {
830 error("Port forwarding is disabled to avoid "
831 "man-in-the-middle attacks.");
832 options.num_local_forwards =
833 options.num_remote_forwards = 0;
836 * XXX Should permit the user to change to use the new id.
837 * This could be done by converting the host key to an
838 * identifying sentence, tell that the host identifies itself
839 * by that sentence, and ask the user if he/she whishes to
840 * accept the authentication.
844 fatal("internal error");
848 if (options.check_host_ip && host_status != HOST_CHANGED &&
849 ip_status == HOST_CHANGED) {
850 snprintf(msg, sizeof(msg),
851 "Warning: the %s host key for '%.200s' "
852 "differs from the key for the IP address '%.128s'"
853 "\nOffending key for IP in %s:%d",
854 type, host, ip, ip_file, ip_line);
855 if (host_status == HOST_OK) {
857 snprintf(msg + len, sizeof(msg) - len,
858 "\nMatching host key in %s:%d",
859 host_file, host_line);
861 if (options.strict_host_key_checking == 1) {
863 error("Exiting, you have requested strict checking.");
865 } else if (options.strict_host_key_checking == 2) {
866 strlcat(msg, "\nAre you sure you want "
867 "to continue connecting (yes/no)? ", sizeof(msg));
883 /* returns 0 if key verifies or -1 if key does NOT verify */
885 verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key)
890 if (options.verify_host_key_dns) {
891 switch(verify_host_key_dns(host, hostaddr, host_key)) {
894 case DNS_VERIFY_FAILED:
896 case DNS_VERIFY_ERROR:
899 debug3("bad return value from verify_host_key_dns");
905 /* return ok if the key can be found in an old keyfile */
906 if (stat(options.system_hostfile2, &st) == 0 ||
907 stat(options.user_hostfile2, &st) == 0) {
908 if (check_host_key(host, hostaddr, host_key, /*readonly*/ 1,
909 options.user_hostfile2, options.system_hostfile2) == 0)
912 return check_host_key(host, hostaddr, host_key, /*readonly*/ 0,
913 options.user_hostfile, options.system_hostfile);
917 * Starts a dialog with the server, and authenticates the current user on the
918 * server. This does not need any extra privileges. The basic connection
919 * to the server must already have been established before this is called.
920 * If login fails, this function prints an error and never returns.
921 * This function does not require super-user privileges.
924 ssh_login(Sensitive *sensitive, const char *orighost,
925 struct sockaddr *hostaddr, struct passwd *pw)
928 char *server_user, *local_user;
930 local_user = xstrdup(pw->pw_name);
931 server_user = options.user ? options.user : local_user;
933 /* Convert the user-supplied hostname into all lowercase. */
934 host = xstrdup(orighost);
935 for (cp = host; *cp; cp++)
939 /* Exchange protocol version identification strings with the server. */
940 ssh_exchange_identification();
942 /* Put the connection into non-blocking mode. */
943 packet_set_nonblocking();
946 /* authenticate user */
948 ssh_kex2(host, hostaddr);
949 ssh_userauth2(local_user, server_user, host, sensitive);
951 ssh_kex(host, hostaddr);
952 ssh_userauth1(local_user, server_user, host, sensitive);
957 ssh_put_password(char *password)
962 if (datafellows & SSH_BUG_PASSWORDPAD) {
963 packet_put_cstring(password);
966 size = roundup(strlen(password) + 1, 32);
967 padded = xmalloc(size);
968 memset(padded, 0, size);
969 strlcpy(padded, password, size);
970 packet_put_string(padded, size);
971 memset(padded, 0, size);
976 show_key_from_file(const char *file, const char *host, int keytype)
982 found = key_new(keytype);
983 if ((ret = lookup_key_in_hostfile_by_type(file, host,
984 keytype, found, &line))) {
985 fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX);
986 logit("WARNING: %s key found for host %s\n"
988 "%s key fingerprint %s.",
989 key_type(found), host, file, line,
990 key_type(found), fp);
997 /* print all known host keys for a given host, but skip keys of given type */
999 show_other_keys(const char *host, Key *key)
1001 int type[] = { KEY_RSA1, KEY_RSA, KEY_DSA, -1};
1004 for (i = 0; type[i] != -1; i++) {
1005 if (type[i] == key->type)
1007 if (type[i] != KEY_RSA1 &&
1008 show_key_from_file(options.user_hostfile2, host, type[i])) {
1012 if (type[i] != KEY_RSA1 &&
1013 show_key_from_file(options.system_hostfile2, host, type[i])) {
1017 if (show_key_from_file(options.user_hostfile, host, type[i])) {
1021 if (show_key_from_file(options.system_hostfile, host, type[i])) {
1025 debug2("no key of type %d for host %s", type[i], host);