| /* |
| * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| * All rights reserved |
| * Created: Sat Mar 18 22:15:47 1995 ylo |
| * Code to connect to a remote host, and to perform the client side of the |
| * login (authentication) dialog. |
| */ |
| |
| #include "includes.h" |
| RCSID("$OpenBSD: sshconnect.c,v 1.77 2000/08/28 03:50:54 deraadt Exp $"); |
| |
| #include <openssl/bn.h> |
| #include <openssl/dsa.h> |
| #include <openssl/rsa.h> |
| |
| #include "xmalloc.h" |
| #include "rsa.h" |
| #include "ssh.h" |
| #include "buffer.h" |
| #include "packet.h" |
| #include "uidswap.h" |
| #include "compat.h" |
| #include "readconf.h" |
| #include "key.h" |
| #include "sshconnect.h" |
| #include "hostfile.h" |
| |
| char *client_version_string = NULL; |
| char *server_version_string = NULL; |
| |
| extern Options options; |
| #ifdef HAVE___PROGNAME |
| extern char *__progname; |
| #else /* HAVE___PROGNAME */ |
| static const char *__progname = "ssh"; |
| #endif /* HAVE___PROGNAME */ |
| |
| /* |
| * Connect to the given ssh server using a proxy command. |
| */ |
| int |
| ssh_proxy_connect(const char *host, u_short port, uid_t original_real_uid, |
| const char *proxy_command) |
| { |
| Buffer command; |
| const char *cp; |
| char *command_string; |
| int pin[2], pout[2]; |
| pid_t pid; |
| char strport[NI_MAXSERV]; |
| |
| /* Convert the port number into a string. */ |
| snprintf(strport, sizeof strport, "%hu", port); |
| |
| /* Build the final command string in the buffer by making the |
| appropriate substitutions to the given proxy command. */ |
| buffer_init(&command); |
| for (cp = proxy_command; *cp; cp++) { |
| if (cp[0] == '%' && cp[1] == '%') { |
| buffer_append(&command, "%", 1); |
| cp++; |
| continue; |
| } |
| if (cp[0] == '%' && cp[1] == 'h') { |
| buffer_append(&command, host, strlen(host)); |
| cp++; |
| continue; |
| } |
| if (cp[0] == '%' && cp[1] == 'p') { |
| buffer_append(&command, strport, strlen(strport)); |
| cp++; |
| continue; |
| } |
| buffer_append(&command, cp, 1); |
| } |
| buffer_append(&command, "\0", 1); |
| |
| /* Get the final command string. */ |
| command_string = buffer_ptr(&command); |
| |
| /* Create pipes for communicating with the proxy. */ |
| if (pipe(pin) < 0 || pipe(pout) < 0) |
| fatal("Could not create pipes to communicate with the proxy: %.100s", |
| strerror(errno)); |
| |
| debug("Executing proxy command: %.500s", command_string); |
| |
| /* Fork and execute the proxy command. */ |
| if ((pid = fork()) == 0) { |
| char *argv[10]; |
| |
| /* Child. Permanently give up superuser privileges. */ |
| permanently_set_uid(original_real_uid); |
| |
| /* Redirect stdin and stdout. */ |
| close(pin[1]); |
| if (pin[0] != 0) { |
| if (dup2(pin[0], 0) < 0) |
| perror("dup2 stdin"); |
| close(pin[0]); |
| } |
| close(pout[0]); |
| if (dup2(pout[1], 1) < 0) |
| perror("dup2 stdout"); |
| /* Cannot be 1 because pin allocated two descriptors. */ |
| close(pout[1]); |
| |
| /* Stderr is left as it is so that error messages get |
| printed on the user's terminal. */ |
| argv[0] = _PATH_BSHELL; |
| argv[1] = "-c"; |
| argv[2] = command_string; |
| argv[3] = NULL; |
| |
| /* Execute the proxy command. Note that we gave up any |
| extra privileges above. */ |
| execv(_PATH_BSHELL, argv); |
| perror(_PATH_BSHELL); |
| exit(1); |
| } |
| /* Parent. */ |
| if (pid < 0) |
| fatal("fork failed: %.100s", strerror(errno)); |
| |
| /* Close child side of the descriptors. */ |
| close(pin[0]); |
| close(pout[1]); |
| |
| /* Free the command name. */ |
| buffer_free(&command); |
| |
| /* Set the connection file descriptors. */ |
| packet_set_connection(pout[0], pin[1]); |
| |
| return 1; |
| } |
| |
| /* |
| * Creates a (possibly privileged) socket for use as the ssh connection. |
| */ |
| int |
| ssh_create_socket(uid_t original_real_uid, int privileged, int family) |
| { |
| int sock; |
| |
| /* |
| * If we are running as root and want to connect to a privileged |
| * port, bind our own socket to a privileged port. |
| */ |
| if (privileged) { |
| int p = IPPORT_RESERVED - 1; |
| sock = rresvport_af(&p, family); |
| if (sock < 0) |
| error("rresvport: af=%d %.100s", family, strerror(errno)); |
| else |
| debug("Allocated local port %d.", p); |
| } else { |
| /* |
| * Just create an ordinary socket on arbitrary port. We use |
| * the user's uid to create the socket. |
| */ |
| temporarily_use_uid(original_real_uid); |
| sock = socket(family, SOCK_STREAM, 0); |
| if (sock < 0) |
| error("socket: %.100s", strerror(errno)); |
| restore_uid(); |
| } |
| return sock; |
| } |
| |
| /* |
| * Opens a TCP/IP connection to the remote server on the given host. |
| * The address of the remote host will be returned in hostaddr. |
| * If port is 0, the default port will be used. If anonymous is zero, |
| * a privileged port will be allocated to make the connection. |
| * This requires super-user privileges if anonymous is false. |
| * Connection_attempts specifies the maximum number of tries (one per |
| * second). If proxy_command is non-NULL, it specifies the command (with %h |
| * and %p substituted for host and port, respectively) to use to contact |
| * the daemon. |
| */ |
| int |
| ssh_connect(const char *host, struct sockaddr_storage * hostaddr, |
| u_short port, int connection_attempts, |
| int anonymous, uid_t original_real_uid, |
| const char *proxy_command) |
| { |
| int sock = -1, attempt; |
| struct servent *sp; |
| struct addrinfo hints, *ai, *aitop; |
| char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| int gaierr; |
| struct linger linger; |
| |
| debug("ssh_connect: getuid %u geteuid %u anon %d", |
| (u_int) getuid(), (u_int) geteuid(), anonymous); |
| |
| /* Get default port if port has not been set. */ |
| if (port == 0) { |
| sp = getservbyname(SSH_SERVICE_NAME, "tcp"); |
| if (sp) |
| port = ntohs(sp->s_port); |
| else |
| port = SSH_DEFAULT_PORT; |
| } |
| /* If a proxy command is given, connect using it. */ |
| if (proxy_command != NULL) |
| return ssh_proxy_connect(host, port, original_real_uid, proxy_command); |
| |
| /* No proxy command. */ |
| |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_family = IPv4or6; |
| hints.ai_socktype = SOCK_STREAM; |
| snprintf(strport, sizeof strport, "%d", port); |
| if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) |
| fatal("%s: %.100s: %s", __progname, host, |
| gai_strerror(gaierr)); |
| |
| /* |
| * Try to connect several times. On some machines, the first time |
| * will sometimes fail. In general socket code appears to behave |
| * quite magically on many machines. |
| */ |
| for (attempt = 0; attempt < connection_attempts; attempt++) { |
| if (attempt > 0) |
| debug("Trying again..."); |
| |
| /* Loop through addresses for this host, and try each one in |
| sequence until the connection succeeds. */ |
| for (ai = aitop; ai; ai = ai->ai_next) { |
| if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| continue; |
| if (getnameinfo(ai->ai_addr, ai->ai_addrlen, |
| ntop, sizeof(ntop), strport, sizeof(strport), |
| NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
| error("ssh_connect: getnameinfo failed"); |
| continue; |
| } |
| debug("Connecting to %.200s [%.100s] port %s.", |
| host, ntop, strport); |
| |
| /* Create a socket for connecting. */ |
| sock = ssh_create_socket(original_real_uid, |
| #ifdef HAVE_CYGWIN |
| !anonymous && port < IPPORT_RESERVED, |
| #else |
| !anonymous && geteuid() == 0 && port < IPPORT_RESERVED, |
| #endif |
| ai->ai_family); |
| if (sock < 0) |
| continue; |
| |
| /* Connect to the host. We use the user's uid in the |
| * hope that it will help with tcp_wrappers showing |
| * the remote uid as root. |
| */ |
| temporarily_use_uid(original_real_uid); |
| if (connect(sock, ai->ai_addr, ai->ai_addrlen) >= 0) { |
| /* Successful connection. */ |
| memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen); |
| restore_uid(); |
| break; |
| } else { |
| debug("connect: %.100s", strerror(errno)); |
| restore_uid(); |
| /* |
| * Close the failed socket; there appear to |
| * be some problems when reusing a socket for |
| * which connect() has already returned an |
| * error. |
| */ |
| shutdown(sock, SHUT_RDWR); |
| close(sock); |
| } |
| } |
| if (ai) |
| break; /* Successful connection. */ |
| |
| /* Sleep a moment before retrying. */ |
| sleep(1); |
| } |
| |
| freeaddrinfo(aitop); |
| |
| /* Return failure if we didn't get a successful connection. */ |
| if (attempt >= connection_attempts) |
| return 0; |
| |
| debug("Connection established."); |
| |
| /* |
| * Set socket options. We would like the socket to disappear as soon |
| * as it has been closed for whatever reason. |
| */ |
| /* setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); */ |
| linger.l_onoff = 1; |
| linger.l_linger = 5; |
| setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &linger, sizeof(linger)); |
| |
| /* Set the connection. */ |
| packet_set_connection(sock, sock); |
| |
| return 1; |
| } |
| |
| /* |
| * Waits for the server identification string, and sends our own |
| * identification string. |
| */ |
| void |
| ssh_exchange_identification() |
| { |
| char buf[256], remote_version[256]; /* must be same size! */ |
| int remote_major, remote_minor, i, mismatch; |
| int connection_in = packet_get_connection_in(); |
| int connection_out = packet_get_connection_out(); |
| |
| /* Read other side\'s version identification. */ |
| for (;;) { |
| for (i = 0; i < sizeof(buf) - 1; i++) { |
| int len = atomicio(read, connection_in, &buf[i], 1); |
| if (len < 0) |
| fatal("ssh_exchange_identification: read: %.100s", strerror(errno)); |
| if (len != 1) |
| fatal("ssh_exchange_identification: Connection closed by remote host"); |
| if (buf[i] == '\r') { |
| buf[i] = '\n'; |
| buf[i + 1] = 0; |
| continue; /**XXX wait for \n */ |
| } |
| if (buf[i] == '\n') { |
| buf[i + 1] = 0; |
| break; |
| } |
| } |
| buf[sizeof(buf) - 1] = 0; |
| if (strncmp(buf, "SSH-", 4) == 0) |
| break; |
| debug("ssh_exchange_identification: %s", buf); |
| } |
| server_version_string = xstrdup(buf); |
| |
| /* |
| * Check that the versions match. In future this might accept |
| * several versions and set appropriate flags to handle them. |
| */ |
| if (sscanf(server_version_string, "SSH-%d.%d-%[^\n]\n", |
| &remote_major, &remote_minor, remote_version) != 3) |
| fatal("Bad remote protocol version identification: '%.100s'", buf); |
| debug("Remote protocol version %d.%d, remote software version %.100s", |
| remote_major, remote_minor, remote_version); |
| |
| compat_datafellows(remote_version); |
| mismatch = 0; |
| |
| switch(remote_major) { |
| case 1: |
| if (remote_minor == 99 && |
| (options.protocol & SSH_PROTO_2) && |
| !(options.protocol & SSH_PROTO_1_PREFERRED)) { |
| enable_compat20(); |
| break; |
| } |
| if (!(options.protocol & SSH_PROTO_1)) { |
| mismatch = 1; |
| break; |
| } |
| if (remote_minor < 3) { |
| fatal("Remote machine has too old SSH software version."); |
| } else if (remote_minor == 3) { |
| /* We speak 1.3, too. */ |
| enable_compat13(); |
| if (options.forward_agent) { |
| log("Agent forwarding disabled for protocol 1.3"); |
| options.forward_agent = 0; |
| } |
| } |
| break; |
| case 2: |
| if (options.protocol & SSH_PROTO_2) { |
| enable_compat20(); |
| break; |
| } |
| /* FALLTHROUGH */ |
| default: |
| mismatch = 1; |
| break; |
| } |
| if (mismatch) |
| fatal("Protocol major versions differ: %d vs. %d", |
| (options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
| remote_major); |
| if (compat20) |
| packet_set_ssh2_format(); |
| /* Send our own protocol version identification. */ |
| snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", |
| compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
| compat20 ? PROTOCOL_MINOR_2 : PROTOCOL_MINOR_1, |
| SSH_VERSION); |
| if (atomicio(write, connection_out, buf, strlen(buf)) != strlen(buf)) |
| fatal("write: %.100s", strerror(errno)); |
| client_version_string = xstrdup(buf); |
| chop(client_version_string); |
| chop(server_version_string); |
| debug("Local version string %.100s", client_version_string); |
| } |
| |
| int |
| read_yes_or_no(const char *prompt, int defval) |
| { |
| char buf[1024]; |
| FILE *f; |
| int retval = -1; |
| |
| if (isatty(0)) |
| f = stdin; |
| else |
| f = fopen("/dev/tty", "rw"); |
| |
| if (f == NULL) |
| return 0; |
| |
| fflush(stdout); |
| |
| while (1) { |
| fprintf(stderr, "%s", prompt); |
| if (fgets(buf, sizeof(buf), f) == NULL) { |
| /* Print a newline (the prompt probably didn\'t have one). */ |
| fprintf(stderr, "\n"); |
| strlcpy(buf, "no", sizeof buf); |
| } |
| /* Remove newline from response. */ |
| if (strchr(buf, '\n')) |
| *strchr(buf, '\n') = 0; |
| |
| if (buf[0] == 0) |
| retval = defval; |
| if (strcmp(buf, "yes") == 0) |
| retval = 1; |
| if (strcmp(buf, "no") == 0) |
| retval = 0; |
| |
| if (retval != -1) { |
| if (f != stdin) |
| fclose(f); |
| return retval; |
| } |
| } |
| } |
| |
| /* |
| * check whether the supplied host key is valid, return only if ok. |
| */ |
| |
| void |
| check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key, |
| const char *user_hostfile, const char *system_hostfile) |
| { |
| Key *file_key; |
| char *type = key_type(host_key); |
| char *ip = NULL; |
| char hostline[1000], *hostp; |
| HostStatus host_status; |
| HostStatus ip_status; |
| int local = 0, host_ip_differ = 0; |
| int salen; |
| char ntop[NI_MAXHOST]; |
| |
| /* |
| * Force accepting of the host key for loopback/localhost. The |
| * problem is that if the home directory is NFS-mounted to multiple |
| * machines, localhost will refer to a different machine in each of |
| * them, and the user will get bogus HOST_CHANGED warnings. This |
| * essentially disables host authentication for localhost; however, |
| * this is probably not a real problem. |
| */ |
| /** hostaddr == 0! */ |
| switch (hostaddr->sa_family) { |
| case AF_INET: |
| local = (ntohl(((struct sockaddr_in *)hostaddr)->sin_addr.s_addr) >> 24) == IN_LOOPBACKNET; |
| salen = sizeof(struct sockaddr_in); |
| break; |
| case AF_INET6: |
| local = IN6_IS_ADDR_LOOPBACK(&(((struct sockaddr_in6 *)hostaddr)->sin6_addr)); |
| salen = sizeof(struct sockaddr_in6); |
| break; |
| default: |
| local = 0; |
| salen = sizeof(struct sockaddr_storage); |
| break; |
| } |
| if (local) { |
| debug("Forcing accepting of host key for loopback/localhost."); |
| return; |
| } |
| |
| /* |
| * Turn off check_host_ip for proxy connects, since |
| * we don't have the remote ip-address |
| */ |
| if (options.proxy_command != NULL && options.check_host_ip) |
| options.check_host_ip = 0; |
| |
| if (options.check_host_ip) { |
| if (getnameinfo(hostaddr, salen, ntop, sizeof(ntop), |
| NULL, 0, NI_NUMERICHOST) != 0) |
| fatal("check_host_key: getnameinfo failed"); |
| ip = xstrdup(ntop); |
| } |
| |
| /* |
| * Store the host key from the known host file in here so that we can |
| * compare it with the key for the IP address. |
| */ |
| file_key = key_new(host_key->type); |
| |
| /* |
| * Check if the host key is present in the user\'s list of known |
| * hosts or in the systemwide list. |
| */ |
| host_status = check_host_in_hostfile(user_hostfile, host, host_key, file_key); |
| if (host_status == HOST_NEW) |
| host_status = check_host_in_hostfile(system_hostfile, host, host_key, file_key); |
| /* |
| * Also perform check for the ip address, skip the check if we are |
| * localhost or the hostname was an ip address to begin with |
| */ |
| if (options.check_host_ip && !local && strcmp(host, ip)) { |
| Key *ip_key = key_new(host_key->type); |
| ip_status = check_host_in_hostfile(user_hostfile, ip, host_key, ip_key); |
| |
| if (ip_status == HOST_NEW) |
| ip_status = check_host_in_hostfile(system_hostfile, ip, host_key, ip_key); |
| if (host_status == HOST_CHANGED && |
| (ip_status != HOST_CHANGED || !key_equal(ip_key, file_key))) |
| host_ip_differ = 1; |
| |
| key_free(ip_key); |
| } else |
| ip_status = host_status; |
| |
| key_free(file_key); |
| |
| switch (host_status) { |
| case HOST_OK: |
| /* The host is known and the key matches. */ |
| debug("Host '%.200s' is known and matches the %s host key.", |
| host, type); |
| if (options.check_host_ip) { |
| if (ip_status == HOST_NEW) { |
| if (!add_host_to_hostfile(user_hostfile, ip, host_key)) |
| log("Failed to add the %s host key for IP address '%.30s' to the list of known hosts (%.30s).", |
| type, ip, user_hostfile); |
| else |
| log("Warning: Permanently added the %s host key for IP address '%.30s' to the list of known hosts.", |
| type, ip); |
| } else if (ip_status != HOST_OK) |
| log("Warning: the %s host key for '%.200s' differs from the key for the IP address '%.30s'", |
| type, host, ip); |
| } |
| break; |
| case HOST_NEW: |
| /* The host is new. */ |
| if (options.strict_host_key_checking == 1) { |
| /* User has requested strict host key checking. We will not add the host key |
| automatically. The only alternative left is to abort. */ |
| fatal("No %s host key is known for %.200s and you have requested strict checking.", type, host); |
| } else if (options.strict_host_key_checking == 2) { |
| /* The default */ |
| char prompt[1024]; |
| char *fp = key_fingerprint(host_key); |
| snprintf(prompt, sizeof(prompt), |
| "The authenticity of host '%.200s' can't be established.\n" |
| "%s key fingerprint is %s.\n" |
| "Are you sure you want to continue connecting (yes/no)? ", |
| host, type, fp); |
| if (!read_yes_or_no(prompt, -1)) |
| fatal("Aborted by user!\n"); |
| } |
| if (options.check_host_ip && ip_status == HOST_NEW && strcmp(host, ip)) { |
| snprintf(hostline, sizeof(hostline), "%s,%s", host, ip); |
| hostp = hostline; |
| } else |
| hostp = host; |
| |
| /* If not in strict mode, add the key automatically to the local known_hosts file. */ |
| if (!add_host_to_hostfile(user_hostfile, hostp, host_key)) |
| log("Failed to add the host to the list of known hosts (%.500s).", |
| user_hostfile); |
| else |
| log("Warning: Permanently added '%.200s' (%s) to the list of known hosts.", |
| hostp, type); |
| break; |
| case HOST_CHANGED: |
| if (options.check_host_ip && host_ip_differ) { |
| char *msg; |
| if (ip_status == HOST_NEW) |
| msg = "is unknown"; |
| else if (ip_status == HOST_OK) |
| msg = "is unchanged"; |
| else |
| msg = "has a different value"; |
| error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @"); |
| error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| error("The %s host key for %s has changed,", type, host); |
| error("and the key for the according IP address %s", ip); |
| error("%s. This could either mean that", msg); |
| error("DNS SPOOFING is happening or the IP address for the host"); |
| error("and its host key have changed at the same time"); |
| } |
| /* The host key has changed. */ |
| error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @"); |
| error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!"); |
| error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!"); |
| error("It is also possible that the %s host key has just been changed.", type); |
| error("Please contact your system administrator."); |
| error("Add correct host key in %.100s to get rid of this message.", |
| user_hostfile); |
| |
| /* |
| * If strict host key checking is in use, the user will have |
| * to edit the key manually and we can only abort. |
| */ |
| if (options.strict_host_key_checking) |
| fatal("%s host key for %.200s has changed and you have requested strict checking.", type, host); |
| |
| /* |
| * If strict host key checking has not been requested, allow |
| * the connection but without password authentication or |
| * agent forwarding. |
| */ |
| if (options.password_authentication) { |
| error("Password authentication is disabled to avoid trojan horses."); |
| options.password_authentication = 0; |
| } |
| if (options.forward_agent) { |
| error("Agent forwarding is disabled to avoid trojan horses."); |
| options.forward_agent = 0; |
| } |
| /* |
| * XXX Should permit the user to change to use the new id. |
| * This could be done by converting the host key to an |
| * identifying sentence, tell that the host identifies itself |
| * by that sentence, and ask the user if he/she whishes to |
| * accept the authentication. |
| */ |
| break; |
| } |
| if (options.check_host_ip) |
| xfree(ip); |
| } |
| |
| /* |
| * Starts a dialog with the server, and authenticates the current user on the |
| * server. This does not need any extra privileges. The basic connection |
| * to the server must already have been established before this is called. |
| * If login fails, this function prints an error and never returns. |
| * This function does not require super-user privileges. |
| */ |
| void |
| ssh_login(int host_key_valid, RSA *own_host_key, const char *orighost, |
| struct sockaddr *hostaddr, uid_t original_real_uid) |
| { |
| struct passwd *pw; |
| char *host, *cp; |
| char *server_user, *local_user; |
| |
| /* Get local user name. Use it as server user if no user name was given. */ |
| pw = getpwuid(original_real_uid); |
| if (!pw) |
| fatal("User id %u not found from user database.", original_real_uid); |
| local_user = xstrdup(pw->pw_name); |
| server_user = options.user ? options.user : local_user; |
| |
| /* Convert the user-supplied hostname into all lowercase. */ |
| host = xstrdup(orighost); |
| for (cp = host; *cp; cp++) |
| if (isupper(*cp)) |
| *cp = tolower(*cp); |
| |
| /* Exchange protocol version identification strings with the server. */ |
| ssh_exchange_identification(); |
| |
| /* Put the connection into non-blocking mode. */ |
| packet_set_nonblocking(); |
| |
| /* key exchange */ |
| /* authenticate user */ |
| if (compat20) { |
| ssh_kex2(host, hostaddr); |
| ssh_userauth2(server_user, host); |
| } else { |
| ssh_kex(host, hostaddr); |
| ssh_userauth(local_user, server_user, host, host_key_valid, own_host_key); |
| } |
| } |