/* $OpenBSD: ssh.c,v 1.574 2022/03/30 04:33:09 djm Exp $ */ /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland * All rights reserved * Ssh client program. This program can be used to log into a remote machine. * The software supports strong authentication, encryption, and forwarding * of X11, TCP/IP, and authentication connections. * * As far as I am concerned, the code I have written for this software * can be used freely for any purpose. Any derived versions of this * software must be clearly marked as such, and if the derived work is * incompatible with the protocol description in the RFC file, it must be * called by a name other than "ssh" or "Secure Shell". * * Copyright (c) 1999 Niels Provos. All rights reserved. * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved. * * Modified to work with SSLeay by Niels Provos * in Canada (German citizen). * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "includes.h" #include #ifdef HAVE_SYS_STAT_H # include #endif #include #include #include #include #include #include #include #include #ifdef HAVE_PATHS_H #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef WITH_OPENSSL #include #include #endif #include "openbsd-compat/openssl-compat.h" #include "openbsd-compat/sys-queue.h" #include "xmalloc.h" #include "ssh.h" #include "ssh2.h" #include "canohost.h" #include "compat.h" #include "cipher.h" #include "packet.h" #include "sshbuf.h" #include "channels.h" #include "sshkey.h" #include "authfd.h" #include "authfile.h" #include "pathnames.h" #include "dispatch.h" #include "clientloop.h" #include "log.h" #include "misc.h" #include "readconf.h" #include "sshconnect.h" #include "kex.h" #include "mac.h" #include "sshpty.h" #include "match.h" #include "msg.h" #include "version.h" #include "ssherr.h" #include "myproposal.h" #include "utf8.h" #ifdef ENABLE_PKCS11 #include "ssh-pkcs11.h" #endif extern char *__progname; /* Saves a copy of argv for setproctitle emulation */ #ifndef HAVE_SETPROCTITLE static char **saved_av; #endif /* Flag indicating whether debug mode is on. May be set on the command line. */ int debug_flag = 0; /* Flag indicating whether a tty should be requested */ int tty_flag = 0; /* * Flag indicating that the current process should be backgrounded and * a new mux-client launched in the foreground for ControlPersist. */ int need_controlpersist_detach = 0; /* Copies of flags for ControlPersist foreground mux-client */ int ostdin_null_flag, osession_type, otty_flag, orequest_tty; /* * General data structure for command line options and options configurable * in configuration files. See readconf.h. */ Options options; /* optional user configfile */ char *config = NULL; /* * Name of the host we are connecting to. This is the name given on the * command line, or the Hostname specified for the user-supplied name in a * configuration file. */ char *host; /* * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is * not NULL, forward the socket at this path instead. */ char *forward_agent_sock_path = NULL; /* socket address the host resolves to */ struct sockaddr_storage hostaddr; /* Private host keys. */ Sensitive sensitive_data; /* command to be executed */ struct sshbuf *command; /* # of replies received for global requests */ static int forward_confirms_pending = -1; /* mux.c */ extern int muxserver_sock; extern u_int muxclient_command; /* Prints a help message to the user. This function never returns. */ static void usage(void) { fprintf(stderr, "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n" " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n" " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n" " [-i identity_file] [-J [user@]host[:port]] [-L address]\n" " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n" " [-w local_tun[:remote_tun]] destination [command [argument ...]]\n" ); exit(255); } static int ssh_session2(struct ssh *, const struct ssh_conn_info *); static void load_public_identity_files(const struct ssh_conn_info *); static void main_sigchld_handler(int); /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */ static void tilde_expand_paths(char **paths, u_int num_paths) { u_int i; char *cp; for (i = 0; i < num_paths; i++) { cp = tilde_expand_filename(paths[i], getuid()); free(paths[i]); paths[i] = cp; } } /* * Expands the set of percent_expand options used by the majority of keywords * in the client that support percent expansion. * Caller must free returned string. */ static char * default_client_percent_expand(const char *str, const struct ssh_conn_info *cinfo) { return percent_expand(str, DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo), (char *)NULL); } /* * Expands the set of percent_expand options used by the majority of keywords * AND perform environment variable substitution. * Caller must free returned string. */ static char * default_client_percent_dollar_expand(const char *str, const struct ssh_conn_info *cinfo) { char *ret; ret = percent_dollar_expand(str, DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo), (char *)NULL); if (ret == NULL) fatal("invalid environment variable expansion"); return ret; } /* * Attempt to resolve a host name / port to a set of addresses and * optionally return any CNAMEs encountered along the way. * Returns NULL on failure. * NB. this function must operate with a options having undefined members. */ static struct addrinfo * resolve_host(const char *name, int port, int logerr, char *cname, size_t clen) { char strport[NI_MAXSERV]; struct addrinfo hints, *res; int gaierr; LogLevel loglevel = SYSLOG_LEVEL_DEBUG1; if (port <= 0) port = default_ssh_port(); if (cname != NULL) *cname = '\0'; debug3_f("lookup %s:%d", name, port); snprintf(strport, sizeof strport, "%d", port); memset(&hints, 0, sizeof(hints)); hints.ai_family = options.address_family == -1 ? AF_UNSPEC : options.address_family; hints.ai_socktype = SOCK_STREAM; if (cname != NULL) hints.ai_flags = AI_CANONNAME; if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) { if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA)) loglevel = SYSLOG_LEVEL_ERROR; do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s", __progname, name, ssh_gai_strerror(gaierr)); return NULL; } if (cname != NULL && res->ai_canonname != NULL) { if (strlcpy(cname, res->ai_canonname, clen) >= clen) { error_f("host \"%s\" cname \"%s\" too long (max %lu)", name, res->ai_canonname, (u_long)clen); if (clen > 0) *cname = '\0'; } } return res; } /* Returns non-zero if name can only be an address and not a hostname */ static int is_addr_fast(const char *name) { return (strchr(name, '%') != NULL || strchr(name, ':') != NULL || strspn(name, "0123456789.") == strlen(name)); } /* Returns non-zero if name represents a valid, single address */ static int is_addr(const char *name) { char strport[NI_MAXSERV]; struct addrinfo hints, *res; if (is_addr_fast(name)) return 1; snprintf(strport, sizeof strport, "%u", default_ssh_port()); memset(&hints, 0, sizeof(hints)); hints.ai_family = options.address_family == -1 ? AF_UNSPEC : options.address_family; hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV; if (getaddrinfo(name, strport, &hints, &res) != 0) return 0; if (res == NULL || res->ai_next != NULL) { freeaddrinfo(res); return 0; } freeaddrinfo(res); return 1; } /* * Attempt to resolve a numeric host address / port to a single address. * Returns a canonical address string. * Returns NULL on failure. * NB. this function must operate with a options having undefined members. */ static struct addrinfo * resolve_addr(const char *name, int port, char *caddr, size_t clen) { char addr[NI_MAXHOST], strport[NI_MAXSERV]; struct addrinfo hints, *res; int gaierr; if (port <= 0) port = default_ssh_port(); snprintf(strport, sizeof strport, "%u", port); memset(&hints, 0, sizeof(hints)); hints.ai_family = options.address_family == -1 ? AF_UNSPEC : options.address_family; hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV; if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) { debug2_f("could not resolve name %.100s as address: %s", name, ssh_gai_strerror(gaierr)); return NULL; } if (res == NULL) { debug_f("getaddrinfo %.100s returned no addresses", name); return NULL; } if (res->ai_next != NULL) { debug_f("getaddrinfo %.100s returned multiple addresses", name); goto fail; } if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen, addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) { debug_f("Could not format address for name %.100s: %s", name, ssh_gai_strerror(gaierr)); goto fail; } if (strlcpy(caddr, addr, clen) >= clen) { error_f("host \"%s\" addr \"%s\" too long (max %lu)", name, addr, (u_long)clen); if (clen > 0) *caddr = '\0'; fail: freeaddrinfo(res); return NULL; } return res; } /* * Check whether the cname is a permitted replacement for the hostname * and perform the replacement if it is. * NB. this function must operate with a options having undefined members. */ static int check_follow_cname(int direct, char **namep, const char *cname) { int i; struct allowed_cname *rule; if (*cname == '\0' || !config_has_permitted_cnames(&options) || strcmp(*namep, cname) == 0) return 0; if (options.canonicalize_hostname == SSH_CANONICALISE_NO) return 0; /* * Don't attempt to canonicalize names that will be interpreted by * a proxy or jump host unless the user specifically requests so. */ if (!direct && options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS) return 0; debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname); for (i = 0; i < options.num_permitted_cnames; i++) { rule = options.permitted_cnames + i; if (match_pattern_list(*namep, rule->source_list, 1) != 1 || match_pattern_list(cname, rule->target_list, 1) != 1) continue; verbose("Canonicalized DNS aliased hostname " "\"%s\" => \"%s\"", *namep, cname); free(*namep); *namep = xstrdup(cname); return 1; } return 0; } /* * Attempt to resolve the supplied hostname after applying the user's * canonicalization rules. Returns the address list for the host or NULL * if no name was found after canonicalization. * NB. this function must operate with a options having undefined members. */ static struct addrinfo * resolve_canonicalize(char **hostp, int port) { int i, direct, ndots; char *cp, *fullhost, newname[NI_MAXHOST]; struct addrinfo *addrs; /* * Attempt to canonicalise addresses, regardless of * whether hostname canonicalisation was requested */ if ((addrs = resolve_addr(*hostp, port, newname, sizeof(newname))) != NULL) { debug2_f("hostname %.100s is address", *hostp); if (strcasecmp(*hostp, newname) != 0) { debug2_f("canonicalised address \"%s\" => \"%s\"", *hostp, newname); free(*hostp); *hostp = xstrdup(newname); } return addrs; } /* * If this looks like an address but didn't parse as one, it might * be an address with an invalid interface scope. Skip further * attempts at canonicalisation. */ if (is_addr_fast(*hostp)) { debug_f("hostname %.100s is an unrecognised address", *hostp); return NULL; } if (options.canonicalize_hostname == SSH_CANONICALISE_NO) return NULL; /* * Don't attempt to canonicalize names that will be interpreted by * a proxy unless the user specifically requests so. */ direct = option_clear_or_none(options.proxy_command) && options.jump_host == NULL; if (!direct && options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS) return NULL; /* If domain name is anchored, then resolve it now */ if ((*hostp)[strlen(*hostp) - 1] == '.') { debug3_f("name is fully qualified"); fullhost = xstrdup(*hostp); if ((addrs = resolve_host(fullhost, port, 0, newname, sizeof(newname))) != NULL) goto found; free(fullhost); goto notfound; } /* Don't apply canonicalization to sufficiently-qualified hostnames */ ndots = 0; for (cp = *hostp; *cp != '\0'; cp++) { if (*cp == '.') ndots++; } if (ndots > options.canonicalize_max_dots) { debug3_f("not canonicalizing hostname \"%s\" (max dots %d)", *hostp, options.canonicalize_max_dots); return NULL; } /* Attempt each supplied suffix */ for (i = 0; i < options.num_canonical_domains; i++) { if (strcasecmp(options.canonical_domains[i], "none") == 0) break; xasprintf(&fullhost, "%s.%s.", *hostp, options.canonical_domains[i]); debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost); if ((addrs = resolve_host(fullhost, port, 0, newname, sizeof(newname))) == NULL) { free(fullhost); continue; } found: /* Remove trailing '.' */ fullhost[strlen(fullhost) - 1] = '\0'; /* Follow CNAME if requested */ if (!check_follow_cname(direct, &fullhost, newname)) { debug("Canonicalized hostname \"%s\" => \"%s\"", *hostp, fullhost); } free(*hostp); *hostp = fullhost; return addrs; } notfound: if (!options.canonicalize_fallback_local) fatal("%s: Could not resolve host \"%s\"", __progname, *hostp); debug2_f("host %s not found in any suffix", *hostp); return NULL; } /* * Check the result of hostkey loading, ignoring some errors and * fatal()ing for others. */ static void check_load(int r, const char *path, const char *message) { switch (r) { case 0: break; case SSH_ERR_INTERNAL_ERROR: case SSH_ERR_ALLOC_FAIL: fatal_r(r, "load %s \"%s\"", message, path); case SSH_ERR_SYSTEM_ERROR: /* Ignore missing files */ if (errno == ENOENT) break; /* FALLTHROUGH */ default: error_r(r, "load %s \"%s\"", message, path); break; } } /* * Read per-user configuration file. Ignore the system wide config * file if the user specifies a config file on the command line. */ static void process_config_files(const char *host_name, struct passwd *pw, int final_pass, int *want_final_pass) { char buf[PATH_MAX]; int r; if (config != NULL) { if (strcasecmp(config, "none") != 0 && !read_config_file(config, pw, host, host_name, &options, SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0), want_final_pass)) fatal("Can't open user config file %.100s: " "%.100s", config, strerror(errno)); } else { r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); if (r > 0 && (size_t)r < sizeof(buf)) (void)read_config_file(buf, pw, host, host_name, &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0), want_final_pass); /* Read systemwide configuration file after user config. */ (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw, host, host_name, &options, final_pass ? SSHCONF_FINAL : 0, want_final_pass); } } /* Rewrite the port number in an addrinfo list of addresses */ static void set_addrinfo_port(struct addrinfo *addrs, int port) { struct addrinfo *addr; for (addr = addrs; addr != NULL; addr = addr->ai_next) { switch (addr->ai_family) { case AF_INET: ((struct sockaddr_in *)addr->ai_addr)-> sin_port = htons(port); break; case AF_INET6: ((struct sockaddr_in6 *)addr->ai_addr)-> sin6_port = htons(port); break; } } } static void ssh_conn_info_free(struct ssh_conn_info *cinfo) { if (cinfo == NULL) return; free(cinfo->conn_hash_hex); free(cinfo->shorthost); free(cinfo->uidstr); free(cinfo->keyalias); free(cinfo->thishost); free(cinfo->host_arg); free(cinfo->portstr); free(cinfo->remhost); free(cinfo->remuser); free(cinfo->homedir); free(cinfo->locuser); free(cinfo); } /* * Main program for the ssh client. */ int main(int ac, char **av) { struct ssh *ssh = NULL; int i, r, opt, exit_status, use_syslog, direct, timeout_ms; int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0; char *p, *cp, *line, *argv0, *logfile, *host_arg; char cname[NI_MAXHOST], thishost[NI_MAXHOST]; struct stat st; struct passwd *pw; extern int optind, optreset; extern char *optarg; struct Forward fwd; struct addrinfo *addrs = NULL; size_t n, len; u_int j; struct ssh_conn_info *cinfo = NULL; /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ sanitise_stdfd(); /* * Discard other fds that are hanging around. These can cause problem * with backgrounded ssh processes started by ControlPersist. */ closefrom(STDERR_FILENO + 1); __progname = ssh_get_progname(av[0]); #ifndef HAVE_SETPROCTITLE /* Prepare for later setproctitle emulation */ /* Save argv so it isn't clobbered by setproctitle() emulation */ saved_av = xcalloc(ac + 1, sizeof(*saved_av)); for (i = 0; i < ac; i++) saved_av[i] = xstrdup(av[i]); saved_av[i] = NULL; compat_init_setproctitle(ac, av); av = saved_av; #endif seed_rng(); /* Get user data. */ pw = getpwuid(getuid()); if (!pw) { logit("No user exists for uid %lu", (u_long)getuid()); exit(255); } /* Take a copy of the returned structure. */ pw = pwcopy(pw); /* * Set our umask to something reasonable, as some files are created * with the default umask. This will make them world-readable but * writable only by the owner, which is ok for all files for which we * don't set the modes explicitly. */ umask(022); msetlocale(); /* * Initialize option structure to indicate that no values have been * set. */ initialize_options(&options); /* * Prepare main ssh transport/connection structures */ if ((ssh = ssh_alloc_session_state()) == NULL) fatal("Couldn't allocate session state"); channel_init_channels(ssh); /* Parse command-line arguments. */ host = NULL; use_syslog = 0; logfile = NULL; argv0 = av[0]; again: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx" "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) { /* HUZdhjruz */ switch (opt) { case '1': fatal("SSH protocol v.1 is no longer supported"); break; case '2': /* Ignored */ break; case '4': options.address_family = AF_INET; break; case '6': options.address_family = AF_INET6; break; case 'n': options.stdin_null = 1; break; case 'f': options.fork_after_authentication = 1; options.stdin_null = 1; break; case 'x': options.forward_x11 = 0; break; case 'X': options.forward_x11 = 1; break; case 'y': use_syslog = 1; break; case 'E': logfile = optarg; break; case 'G': config_test = 1; break; case 'Y': options.forward_x11 = 1; options.forward_x11_trusted = 1; break; case 'g': options.fwd_opts.gateway_ports = 1; break; case 'O': if (options.stdio_forward_host != NULL) fatal("Cannot specify multiplexing " "command with -W"); else if (muxclient_command != 0) fatal("Multiplexing command already specified"); if (strcmp(optarg, "check") == 0) muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK; else if (strcmp(optarg, "forward") == 0) muxclient_command = SSHMUX_COMMAND_FORWARD; else if (strcmp(optarg, "exit") == 0) muxclient_command = SSHMUX_COMMAND_TERMINATE; else if (strcmp(optarg, "stop") == 0) muxclient_command = SSHMUX_COMMAND_STOP; else if (strcmp(optarg, "cancel") == 0) muxclient_command = SSHMUX_COMMAND_CANCEL_FWD; else if (strcmp(optarg, "proxy") == 0) muxclient_command = SSHMUX_COMMAND_PROXY; else fatal("Invalid multiplex command."); break; case 'P': /* deprecated */ break; case 'Q': cp = NULL; if (strcmp(optarg, "cipher") == 0 || strcasecmp(optarg, "Ciphers") == 0) cp = cipher_alg_list('\n', 0); else if (strcmp(optarg, "cipher-auth") == 0) cp = cipher_alg_list('\n', 1); else if (strcmp(optarg, "mac") == 0 || strcasecmp(optarg, "MACs") == 0) cp = mac_alg_list('\n'); else if (strcmp(optarg, "kex") == 0 || strcasecmp(optarg, "KexAlgorithms") == 0) cp = kex_alg_list('\n'); else if (strcmp(optarg, "key") == 0) cp = sshkey_alg_list(0, 0, 0, '\n'); else if (strcmp(optarg, "key-cert") == 0) cp = sshkey_alg_list(1, 0, 0, '\n'); else if (strcmp(optarg, "key-plain") == 0) cp = sshkey_alg_list(0, 1, 0, '\n'); else if (strcmp(optarg, "key-sig") == 0 || strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */ strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 || strcasecmp(optarg, "HostKeyAlgorithms") == 0 || strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */ strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */ strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0) cp = sshkey_alg_list(0, 0, 1, '\n'); else if (strcmp(optarg, "sig") == 0) cp = sshkey_alg_list(0, 1, 1, '\n'); else if (strcmp(optarg, "protocol-version") == 0) cp = xstrdup("2"); else if (strcmp(optarg, "compression") == 0) { cp = xstrdup(compression_alg_list(0)); len = strlen(cp); for (n = 0; n < len; n++) if (cp[n] == ',') cp[n] = '\n'; } else if (strcmp(optarg, "help") == 0) { cp = xstrdup( "cipher\ncipher-auth\ncompression\nkex\n" "key\nkey-cert\nkey-plain\nkey-sig\nmac\n" "protocol-version\nsig"); } if (cp == NULL) fatal("Unsupported query \"%s\"", optarg); printf("%s\n", cp); free(cp); exit(0); break; case 'a': options.forward_agent = 0; break; case 'A': options.forward_agent = 1; break; case 'k': options.gss_deleg_creds = 0; break; case 'K': options.gss_authentication = 1; options.gss_deleg_creds = 1; break; case 'i': p = tilde_expand_filename(optarg, getuid()); if (stat(p, &st) == -1) fprintf(stderr, "Warning: Identity file %s " "not accessible: %s.\n", p, strerror(errno)); else add_identity_file(&options, NULL, p, 1); free(p); break; case 'I': #ifdef ENABLE_PKCS11 free(options.pkcs11_provider); options.pkcs11_provider = xstrdup(optarg); #else fprintf(stderr, "no support for PKCS#11.\n"); #endif break; case 'J': if (options.jump_host != NULL) { fatal("Only a single -J option is permitted " "(use commas to separate multiple " "jump hops)"); } if (options.proxy_command != NULL) fatal("Cannot specify -J with ProxyCommand"); if (parse_jump(optarg, &options, 1) == -1) fatal("Invalid -J argument"); options.proxy_command = xstrdup("none"); break; case 't': if (options.request_tty == REQUEST_TTY_YES) options.request_tty = REQUEST_TTY_FORCE; else options.request_tty = REQUEST_TTY_YES; break; case 'v': if (debug_flag == 0) { debug_flag = 1; options.log_level = SYSLOG_LEVEL_DEBUG1; } else { if (options.log_level < SYSLOG_LEVEL_DEBUG3) { debug_flag++; options.log_level++; } } break; case 'V': fprintf(stderr, "%s, %s\n", SSH_RELEASE, SSH_OPENSSL_VERSION); if (opt == 'V') exit(0); break; case 'w': if (options.tun_open == -1) options.tun_open = SSH_TUNMODE_DEFAULT; options.tun_local = a2tun(optarg, &options.tun_remote); if (options.tun_local == SSH_TUNID_ERR) { fprintf(stderr, "Bad tun device '%s'\n", optarg); exit(255); } break; case 'W': if (options.stdio_forward_host != NULL) fatal("stdio forward already specified"); if (muxclient_command != 0) fatal("Cannot specify stdio forward with -O"); if (parse_forward(&fwd, optarg, 1, 0)) { options.stdio_forward_host = fwd.listen_host; options.stdio_forward_port = fwd.listen_port; free(fwd.connect_host); } else { fprintf(stderr, "Bad stdio forwarding specification '%s'\n", optarg); exit(255); } options.request_tty = REQUEST_TTY_NO; options.session_type = SESSION_TYPE_NONE; break; case 'q': options.log_level = SYSLOG_LEVEL_QUIET; break; case 'e': if (optarg[0] == '^' && optarg[2] == 0 && (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) options.escape_char = (u_char) optarg[1] & 31; else if (strlen(optarg) == 1) options.escape_char = (u_char) optarg[0]; else if (strcmp(optarg, "none") == 0) options.escape_char = SSH_ESCAPECHAR_NONE; else { fprintf(stderr, "Bad escape character '%s'.\n", optarg); exit(255); } break; case 'c': if (!ciphers_valid(*optarg == '+' || *optarg == '^' ? optarg + 1 : optarg)) { fprintf(stderr, "Unknown cipher type '%s'\n", optarg); exit(255); } free(options.ciphers); options.ciphers = xstrdup(optarg); break; case 'm': if (mac_valid(optarg)) { free(options.macs); options.macs = xstrdup(optarg); } else { fprintf(stderr, "Unknown mac type '%s'\n", optarg); exit(255); } break; case 'M': if (options.control_master == SSHCTL_MASTER_YES) options.control_master = SSHCTL_MASTER_ASK; else options.control_master = SSHCTL_MASTER_YES; break; case 'p': if (options.port == -1) { options.port = a2port(optarg); if (options.port <= 0) { fprintf(stderr, "Bad port '%s'\n", optarg); exit(255); } } break; case 'l': if (options.user == NULL) options.user = optarg; break; case 'L': if (parse_forward(&fwd, optarg, 0, 0)) add_local_forward(&options, &fwd); else { fprintf(stderr, "Bad local forwarding specification '%s'\n", optarg); exit(255); } break; case 'R': if (parse_forward(&fwd, optarg, 0, 1) || parse_forward(&fwd, optarg, 1, 1)) { add_remote_forward(&options, &fwd); } else { fprintf(stderr, "Bad remote forwarding specification " "'%s'\n", optarg); exit(255); } break; case 'D': if (parse_forward(&fwd, optarg, 1, 0)) { add_local_forward(&options, &fwd); } else { fprintf(stderr, "Bad dynamic forwarding specification " "'%s'\n", optarg); exit(255); } break; case 'C': #ifdef WITH_ZLIB options.compression = 1; #else error("Compression not supported, disabling."); #endif break; case 'N': if (options.session_type != -1 && options.session_type != SESSION_TYPE_NONE) fatal("Cannot specify -N with -s/SessionType"); options.session_type = SESSION_TYPE_NONE; options.request_tty = REQUEST_TTY_NO; break; case 'T': options.request_tty = REQUEST_TTY_NO; break; case 'o': line = xstrdup(optarg); if (process_config_line(&options, pw, host ? host : "", host ? host : "", line, "command-line", 0, NULL, SSHCONF_USERCONF) != 0) exit(255); free(line); break; case 's': if (options.session_type != -1 && options.session_type != SESSION_TYPE_SUBSYSTEM) fatal("Cannot specify -s with -N/SessionType"); options.session_type = SESSION_TYPE_SUBSYSTEM; break; case 'S': free(options.control_path); options.control_path = xstrdup(optarg); break; case 'b': options.bind_address = optarg; break; case 'B': options.bind_interface = optarg; break; case 'F': config = optarg; break; default: usage(); } } if (optind > 1 && strcmp(av[optind - 1], "--") == 0) opt_terminated = 1; ac -= optind; av += optind; if (ac > 0 && !host) { int tport; char *tuser; switch (parse_ssh_uri(*av, &tuser, &host, &tport)) { case -1: usage(); break; case 0: if (options.user == NULL) { options.user = tuser; tuser = NULL; } free(tuser); if (options.port == -1 && tport != -1) options.port = tport; break; default: p = xstrdup(*av); cp = strrchr(p, '@'); if (cp != NULL) { if (cp == p) usage(); if (options.user == NULL) { options.user = p; p = NULL; } *cp++ = '\0'; host = xstrdup(cp); free(p); } else host = p; break; } if (ac > 1 && !opt_terminated) { optind = optreset = 1; goto again; } ac--, av++; } /* Check that we got a host name. */ if (!host) usage(); host_arg = xstrdup(host); /* Initialize the command to execute on remote host. */ if ((command = sshbuf_new()) == NULL) fatal("sshbuf_new failed"); /* * Save the command to execute on the remote host in a buffer. There * is no limit on the length of the command, except by the maximum * packet size. Also sets the tty flag if there is no command. */ if (!ac) { /* No command specified - execute shell on a tty. */ if (options.session_type == SESSION_TYPE_SUBSYSTEM) { fprintf(stderr, "You must specify a subsystem to invoke.\n"); usage(); } } else { /* A command has been specified. Store it into the buffer. */ for (i = 0; i < ac; i++) { if ((r = sshbuf_putf(command, "%s%s", i ? " " : "", av[i])) != 0) fatal_fr(r, "buffer error"); } } /* * Initialize "log" output. Since we are the client all output * goes to stderr unless otherwise specified by -y or -E. */ if (use_syslog && logfile != NULL) fatal("Can't specify both -y and -E"); if (logfile != NULL) log_redirect_stderr_to(logfile); log_init(argv0, options.log_level == SYSLOG_LEVEL_NOT_SET ? SYSLOG_LEVEL_INFO : options.log_level, options.log_facility == SYSLOG_FACILITY_NOT_SET ? SYSLOG_FACILITY_USER : options.log_facility, !use_syslog); if (debug_flag) logit("%s, %s", SSH_RELEASE, SSH_OPENSSL_VERSION); /* Parse the configuration files */ process_config_files(host_arg, pw, 0, &want_final_pass); if (want_final_pass) debug("configuration requests final Match pass"); /* Hostname canonicalisation needs a few options filled. */ fill_default_options_for_canonicalization(&options); /* If the user has replaced the hostname then take it into use now */ if (options.hostname != NULL) { /* NB. Please keep in sync with readconf.c:match_cfg_line() */ cp = percent_expand(options.hostname, "h", host, (char *)NULL); free(host); host = cp; free(options.hostname); options.hostname = xstrdup(host); } /* Don't lowercase addresses, they will be explicitly canonicalised */ if ((was_addr = is_addr(host)) == 0) lowercase(host); /* * Try to canonicalize if requested by configuration or the * hostname is an address. */ if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr) addrs = resolve_canonicalize(&host, options.port); /* * If CanonicalizePermittedCNAMEs have been specified but * other canonicalization did not happen (by not being requested * or by failing with fallback) then the hostname may still be changed * as a result of CNAME following. * * Try to resolve the bare hostname name using the system resolver's * usual search rules and then apply the CNAME follow rules. * * Skip the lookup if a ProxyCommand is being used unless the user * has specifically requested canonicalisation for this case via * CanonicalizeHostname=always */ direct = option_clear_or_none(options.proxy_command) && options.jump_host == NULL; if (addrs == NULL && config_has_permitted_cnames(&options) && (direct || options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) { if ((addrs = resolve_host(host, options.port, direct, cname, sizeof(cname))) == NULL) { /* Don't fatal proxied host names not in the DNS */ if (direct) cleanup_exit(255); /* logged in resolve_host */ } else check_follow_cname(direct, &host, cname); } /* * If canonicalisation is enabled then re-parse the configuration * files as new stanzas may match. */ if (options.canonicalize_hostname != 0 && !want_final_pass) { debug("hostname canonicalisation enabled, " "will re-parse configuration"); want_final_pass = 1; } if (want_final_pass) { debug("re-parsing configuration"); free(options.hostname); options.hostname = xstrdup(host); process_config_files(host_arg, pw, 1, NULL); /* * Address resolution happens early with canonicalisation * enabled and the port number may have changed since, so * reset it in address list */ if (addrs != NULL && options.port > 0) set_addrinfo_port(addrs, options.port); } /* Fill configuration defaults. */ if (fill_default_options(&options) != 0) cleanup_exit(255); if (options.user == NULL) options.user = xstrdup(pw->pw_name); /* * If ProxyJump option specified, then construct a ProxyCommand now. */ if (options.jump_host != NULL) { char port_s[8]; const char *jumpuser = options.jump_user, *sshbin = argv0; int port = options.port, jumpport = options.jump_port; if (port <= 0) port = default_ssh_port(); if (jumpport <= 0) jumpport = default_ssh_port(); if (jumpuser == NULL) jumpuser = options.user; if (strcmp(options.jump_host, host) == 0 && port == jumpport && strcmp(options.user, jumpuser) == 0) fatal("jumphost loop via %s", options.jump_host); /* * Try to use SSH indicated by argv[0], but fall back to * "ssh" if it appears unavailable. */ if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0) sshbin = "ssh"; /* Consistency check */ if (options.proxy_command != NULL) fatal("inconsistent options: ProxyCommand+ProxyJump"); /* Never use FD passing for ProxyJump */ options.proxy_use_fdpass = 0; snprintf(port_s, sizeof(port_s), "%d", options.jump_port); xasprintf(&options.proxy_command, "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s", sshbin, /* Optional "-l user" argument if jump_user set */ options.jump_user == NULL ? "" : " -l ", options.jump_user == NULL ? "" : options.jump_user, /* Optional "-p port" argument if jump_port set */ options.jump_port <= 0 ? "" : " -p ", options.jump_port <= 0 ? "" : port_s, /* Optional additional jump hosts ",..." */ options.jump_extra == NULL ? "" : " -J ", options.jump_extra == NULL ? "" : options.jump_extra, /* Optional "-F" argument if -F specified */ config == NULL ? "" : " -F ", config == NULL ? "" : config, /* Optional "-v" arguments if -v set */ debug_flag ? " -" : "", debug_flag, "vvv", /* Mandatory hostname */ options.jump_host); debug("Setting implicit ProxyCommand from ProxyJump: %s", options.proxy_command); } if (options.port == 0) options.port = default_ssh_port(); channel_set_af(ssh, options.address_family); /* Tidy and check options */ if (options.host_key_alias != NULL) lowercase(options.host_key_alias); if (options.proxy_command != NULL && strcmp(options.proxy_command, "-") == 0 && options.proxy_use_fdpass) fatal("ProxyCommand=- and ProxyUseFDPass are incompatible"); if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) { if (options.control_persist && options.control_path != NULL) { debug("UpdateHostKeys=ask is incompatible with " "ControlPersist; disabling"); options.update_hostkeys = 0; } else if (sshbuf_len(command) != 0 || options.remote_command != NULL || options.request_tty == REQUEST_TTY_NO) { debug("UpdateHostKeys=ask is incompatible with " "remote command execution; disabling"); options.update_hostkeys = 0; } else if (options.log_level < SYSLOG_LEVEL_INFO) { /* no point logging anything; user won't see it */ options.update_hostkeys = 0; } } if (options.connection_attempts <= 0) fatal("Invalid number of ConnectionAttempts"); if (sshbuf_len(command) != 0 && options.remote_command != NULL) fatal("Cannot execute command-line and remote command."); /* Cannot fork to background if no command. */ if (options.fork_after_authentication && sshbuf_len(command) == 0 && options.remote_command == NULL && options.session_type != SESSION_TYPE_NONE) fatal("Cannot fork into background without a command " "to execute."); /* reinit */ log_init(argv0, options.log_level, options.log_facility, !use_syslog); for (j = 0; j < options.num_log_verbose; j++) { if (strcasecmp(options.log_verbose[j], "none") == 0) break; log_verbose_add(options.log_verbose[j]); } if (options.request_tty == REQUEST_TTY_YES || options.request_tty == REQUEST_TTY_FORCE) tty_flag = 1; /* Allocate a tty by default if no command specified. */ if (sshbuf_len(command) == 0 && options.remote_command == NULL) tty_flag = options.request_tty != REQUEST_TTY_NO; /* Force no tty */ if (options.request_tty == REQUEST_TTY_NO || (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY) || options.session_type == SESSION_TYPE_NONE) tty_flag = 0; /* Do not allocate a tty if stdin is not a tty. */ if ((!isatty(fileno(stdin)) || options.stdin_null) && options.request_tty != REQUEST_TTY_FORCE) { if (tty_flag) logit("Pseudo-terminal will not be allocated because " "stdin is not a terminal."); tty_flag = 0; } /* Set up strings used to percent_expand() arguments */ cinfo = xcalloc(1, sizeof(*cinfo)); if (gethostname(thishost, sizeof(thishost)) == -1) fatal("gethostname: %s", strerror(errno)); cinfo->thishost = xstrdup(thishost); thishost[strcspn(thishost, ".")] = '\0'; cinfo->shorthost = xstrdup(thishost); xasprintf(&cinfo->portstr, "%d", options.port); xasprintf(&cinfo->uidstr, "%llu", (unsigned long long)pw->pw_uid); cinfo->keyalias = xstrdup(options.host_key_alias ? options.host_key_alias : host_arg); cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host, cinfo->portstr, options.user); cinfo->host_arg = xstrdup(host_arg); cinfo->remhost = xstrdup(host); cinfo->remuser = xstrdup(options.user); cinfo->homedir = xstrdup(pw->pw_dir); cinfo->locuser = xstrdup(pw->pw_name); /* Find canonic host name. */ if (strchr(host, '.') == 0) { struct addrinfo hints; struct addrinfo *ai = NULL; int errgai; memset(&hints, 0, sizeof(hints)); hints.ai_family = options.address_family; hints.ai_flags = AI_CANONNAME; hints.ai_socktype = SOCK_STREAM; errgai = getaddrinfo(host, NULL, &hints, &ai); if (errgai == 0) { if (ai->ai_canonname != NULL) host = xstrdup(ai->ai_canonname); freeaddrinfo(ai); } } /* * Expand tokens in arguments. NB. LocalCommand is expanded later, * after port-forwarding is set up, so it may pick up any local * tunnel interface name allocated. */ if (options.remote_command != NULL) { debug3("expanding RemoteCommand: %s", options.remote_command); cp = options.remote_command; options.remote_command = default_client_percent_expand(cp, cinfo); debug3("expanded RemoteCommand: %s", options.remote_command); free(cp); if ((r = sshbuf_put(command, options.remote_command, strlen(options.remote_command))) != 0) fatal_fr(r, "buffer error"); } if (options.control_path != NULL) { cp = tilde_expand_filename(options.control_path, getuid()); free(options.control_path); options.control_path = default_client_percent_dollar_expand(cp, cinfo); free(cp); } if (options.identity_agent != NULL) { p = tilde_expand_filename(options.identity_agent, getuid()); cp = default_client_percent_dollar_expand(p, cinfo); free(p); free(options.identity_agent); options.identity_agent = cp; } if (options.forward_agent_sock_path != NULL) { p = tilde_expand_filename(options.forward_agent_sock_path, getuid()); cp = default_client_percent_dollar_expand(p, cinfo); free(p); free(options.forward_agent_sock_path); options.forward_agent_sock_path = cp; if (stat(options.forward_agent_sock_path, &st) != 0) { error("Cannot forward agent socket path \"%s\": %s", options.forward_agent_sock_path, strerror(errno)); if (options.exit_on_forward_failure) cleanup_exit(255); } } if (options.num_system_hostfiles > 0 && strcasecmp(options.system_hostfiles[0], "none") == 0) { if (options.num_system_hostfiles > 1) fatal("Invalid GlobalKnownHostsFiles: \"none\" " "appears with other entries"); free(options.system_hostfiles[0]); options.system_hostfiles[0] = NULL; options.num_system_hostfiles = 0; } if (options.num_user_hostfiles > 0 && strcasecmp(options.user_hostfiles[0], "none") == 0) { if (options.num_user_hostfiles > 1) fatal("Invalid UserKnownHostsFiles: \"none\" " "appears with other entries"); free(options.user_hostfiles[0]); options.user_hostfiles[0] = NULL; options.num_user_hostfiles = 0; } for (j = 0; j < options.num_user_hostfiles; j++) { if (options.user_hostfiles[j] == NULL) continue; cp = tilde_expand_filename(options.user_hostfiles[j], getuid()); p = default_client_percent_dollar_expand(cp, cinfo); if (strcmp(options.user_hostfiles[j], p) != 0) debug3("expanded UserKnownHostsFile '%s' -> " "'%s'", options.user_hostfiles[j], p); free(options.user_hostfiles[j]); free(cp); options.user_hostfiles[j] = p; } for (i = 0; i < options.num_local_forwards; i++) { if (options.local_forwards[i].listen_path != NULL) { cp = options.local_forwards[i].listen_path; p = options.local_forwards[i].listen_path = default_client_percent_expand(cp, cinfo); if (strcmp(cp, p) != 0) debug3("expanded LocalForward listen path " "'%s' -> '%s'", cp, p); free(cp); } if (options.local_forwards[i].connect_path != NULL) { cp = options.local_forwards[i].connect_path; p = options.local_forwards[i].connect_path = default_client_percent_expand(cp, cinfo); if (strcmp(cp, p) != 0) debug3("expanded LocalForward connect path " "'%s' -> '%s'", cp, p); free(cp); } } for (i = 0; i < options.num_remote_forwards; i++) { if (options.remote_forwards[i].listen_path != NULL) { cp = options.remote_forwards[i].listen_path; p = options.remote_forwards[i].listen_path = default_client_percent_expand(cp, cinfo); if (strcmp(cp, p) != 0) debug3("expanded RemoteForward listen path " "'%s' -> '%s'", cp, p); free(cp); } if (options.remote_forwards[i].connect_path != NULL) { cp = options.remote_forwards[i].connect_path; p = options.remote_forwards[i].connect_path = default_client_percent_expand(cp, cinfo); if (strcmp(cp, p) != 0) debug3("expanded RemoteForward connect path " "'%s' -> '%s'", cp, p); free(cp); } } if (config_test) { dump_client_config(&options, host); exit(0); } /* Expand SecurityKeyProvider if it refers to an environment variable */ if (options.sk_provider != NULL && *options.sk_provider == '$' && strlen(options.sk_provider) > 1) { if ((cp = getenv(options.sk_provider + 1)) == NULL) { debug("Authenticator provider %s did not resolve; " "disabling", options.sk_provider); free(options.sk_provider); options.sk_provider = NULL; } else { debug2("resolved SecurityKeyProvider %s => %s", options.sk_provider, cp); free(options.sk_provider); options.sk_provider = xstrdup(cp); } } if (muxclient_command != 0 && options.control_path == NULL) fatal("No ControlPath specified for \"-O\" command"); if (options.control_path != NULL) { int sock; if ((sock = muxclient(options.control_path)) >= 0) { ssh_packet_set_connection(ssh, sock, sock); ssh_packet_set_mux(ssh); goto skip_connect; } } /* * If hostname canonicalisation was not enabled, then we may not * have yet resolved the hostname. Do so now. */ if (addrs == NULL && options.proxy_command == NULL) { debug2("resolving \"%s\" port %d", host, options.port); if ((addrs = resolve_host(host, options.port, 1, cname, sizeof(cname))) == NULL) cleanup_exit(255); /* resolve_host logs the error */ } if (options.connection_timeout >= INT_MAX/1000) timeout_ms = INT_MAX; else timeout_ms = options.connection_timeout * 1000; /* Open a connection to the remote host. */ if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port, options.connection_attempts, &timeout_ms, options.tcp_keep_alive) != 0) exit(255); if (addrs != NULL) freeaddrinfo(addrs); ssh_packet_set_timeout(ssh, options.server_alive_interval, options.server_alive_count_max); if (timeout_ms > 0) debug3("timeout: %d ms remain after connect", timeout_ms); /* * If we successfully made the connection and we have hostbased auth * enabled, load the public keys so we can later use the ssh-keysign * helper to sign challenges. */ sensitive_data.nkeys = 0; sensitive_data.keys = NULL; if (options.hostbased_authentication) { sensitive_data.nkeys = 10; sensitive_data.keys = xcalloc(sensitive_data.nkeys, sizeof(struct sshkey)); /* XXX check errors? */ #define L_PUBKEY(p,o) do { \ if ((o) >= sensitive_data.nkeys) \ fatal_f("pubkey out of array bounds"); \ check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \ p, "pubkey"); \ if (sensitive_data.keys[o] != NULL) \ debug2("hostbased key %d: %s key from \"%s\"", o, \ sshkey_ssh_name(sensitive_data.keys[o]), p); \ } while (0) #define L_CERT(p,o) do { \ if ((o) >= sensitive_data.nkeys) \ fatal_f("cert out of array bounds"); \ check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \ if (sensitive_data.keys[o] != NULL) \ debug2("hostbased key %d: %s cert from \"%s\"", o, \ sshkey_ssh_name(sensitive_data.keys[o]), p); \ } while (0) if (options.hostbased_authentication == 1) { L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0); L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1); L_CERT(_PATH_HOST_RSA_KEY_FILE, 2); L_CERT(_PATH_HOST_DSA_KEY_FILE, 3); L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4); L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5); L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6); L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7); L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8); L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9); } } /* load options.identity_files */ load_public_identity_files(cinfo); /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */ if (options.identity_agent && strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) { if (strcmp(options.identity_agent, "none") == 0) { unsetenv(SSH_AUTHSOCKET_ENV_NAME); } else { cp = options.identity_agent; /* legacy (limited) format */ if (cp[0] == '$' && cp[1] != '{') { if (!valid_env_name(cp + 1)) { fatal("Invalid IdentityAgent " "environment variable name %s", cp); } if ((p = getenv(cp + 1)) == NULL) unsetenv(SSH_AUTHSOCKET_ENV_NAME); else setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1); } else { /* identity_agent specifies a path directly */ setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1); } } } if (options.forward_agent && options.forward_agent_sock_path != NULL) { cp = options.forward_agent_sock_path; if (cp[0] == '$') { if (!valid_env_name(cp + 1)) { fatal("Invalid ForwardAgent environment variable name %s", cp); } if ((p = getenv(cp + 1)) != NULL) forward_agent_sock_path = xstrdup(p); else options.forward_agent = 0; free(cp); } else { forward_agent_sock_path = cp; } } /* Expand ~ in known host file names. */ tilde_expand_paths(options.system_hostfiles, options.num_system_hostfiles); tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles); ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ ssh_signal(SIGCHLD, main_sigchld_handler); /* Log into the remote system. Never returns if the login fails. */ ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr, options.port, pw, timeout_ms, cinfo); /* We no longer need the private host keys. Clear them now. */ if (sensitive_data.nkeys != 0) { for (i = 0; i < sensitive_data.nkeys; i++) { if (sensitive_data.keys[i] != NULL) { /* Destroys contents safely */ debug3("clear hostkey %d", i); sshkey_free(sensitive_data.keys[i]); sensitive_data.keys[i] = NULL; } } free(sensitive_data.keys); } for (i = 0; i < options.num_identity_files; i++) { free(options.identity_files[i]); options.identity_files[i] = NULL; if (options.identity_keys[i]) { sshkey_free(options.identity_keys[i]); options.identity_keys[i] = NULL; } } for (i = 0; i < options.num_certificate_files; i++) { free(options.certificate_files[i]); options.certificate_files[i] = NULL; } #ifdef ENABLE_PKCS11 (void)pkcs11_del_provider(options.pkcs11_provider); #endif skip_connect: exit_status = ssh_session2(ssh, cinfo); ssh_conn_info_free(cinfo); ssh_packet_close(ssh); if (options.control_path != NULL && muxserver_sock != -1) unlink(options.control_path); /* Kill ProxyCommand if it is running. */ ssh_kill_proxy_command(); return exit_status; } static void control_persist_detach(void) { pid_t pid; debug_f("backgrounding master process"); /* * master (current process) into the background, and make the * foreground process a client of the backgrounded master. */ switch ((pid = fork())) { case -1: fatal_f("fork: %s", strerror(errno)); case 0: /* Child: master process continues mainloop */ break; default: /* Parent: set up mux client to connect to backgrounded master */ debug2_f("background process is %ld", (long)pid); options.stdin_null = ostdin_null_flag; options.request_tty = orequest_tty; tty_flag = otty_flag; options.session_type = osession_type; close(muxserver_sock); muxserver_sock = -1; options.control_master = SSHCTL_MASTER_NO; muxclient(options.control_path); /* muxclient() doesn't return on success. */ fatal("Failed to connect to new control master"); } if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1) error_f("stdfd_devnull failed"); daemon(1, 1); setproctitle("%s [mux]", options.control_path); } /* Do fork() after authentication. Used by "ssh -f" */ static void fork_postauth(void) { if (need_controlpersist_detach) control_persist_detach(); debug("forking to background"); options.fork_after_authentication = 0; if (daemon(1, 1) == -1) fatal("daemon() failed: %.200s", strerror(errno)); if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1) error_f("stdfd_devnull failed"); } static void forwarding_success(void) { if (forward_confirms_pending == -1) return; if (--forward_confirms_pending == 0) { debug_f("all expected forwarding replies received"); if (options.fork_after_authentication) fork_postauth(); } else { debug2_f("%d expected forwarding replies remaining", forward_confirms_pending); } } /* Callback for remote forward global requests */ static void ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt) { struct Forward *rfwd = (struct Forward *)ctxt; u_int port; int r; /* XXX verbose() on failure? */ debug("remote forward %s for: listen %s%s%d, connect %s:%d", type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", rfwd->listen_path ? rfwd->listen_path : rfwd->listen_host ? rfwd->listen_host : "", (rfwd->listen_path || rfwd->listen_host) ? ":" : "", rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path : rfwd->connect_host, rfwd->connect_port); if (rfwd->listen_path == NULL && rfwd->listen_port == 0) { if (type == SSH2_MSG_REQUEST_SUCCESS) { if ((r = sshpkt_get_u32(ssh, &port)) != 0) fatal_fr(r, "parse packet"); if (port > 65535) { error("Invalid allocated port %u for remote " "forward to %s:%d", port, rfwd->connect_host, rfwd->connect_port); /* Ensure failure processing runs below */ type = SSH2_MSG_REQUEST_FAILURE; channel_update_permission(ssh, rfwd->handle, -1); } else { rfwd->allocated_port = (int)port; logit("Allocated port %u for remote " "forward to %s:%d", rfwd->allocated_port, rfwd->connect_path ? rfwd->connect_path : rfwd->connect_host, rfwd->connect_port); channel_update_permission(ssh, rfwd->handle, rfwd->allocated_port); } } else { channel_update_permission(ssh, rfwd->handle, -1); } } if (type == SSH2_MSG_REQUEST_FAILURE) { if (options.exit_on_forward_failure) { if (rfwd->listen_path != NULL) fatal("Error: remote port forwarding failed " "for listen path %s", rfwd->listen_path); else fatal("Error: remote port forwarding failed " "for listen port %d", rfwd->listen_port); } else { if (rfwd->listen_path != NULL) logit("Warning: remote port forwarding failed " "for listen path %s", rfwd->listen_path); else logit("Warning: remote port forwarding failed " "for listen port %d", rfwd->listen_port); } } forwarding_success(); } static void client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg) { debug("stdio forwarding: done"); cleanup_exit(0); } static void ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg) { if (!success) fatal("stdio forwarding failed"); } static void ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg) { if (!success) { error("Tunnel forwarding failed"); if (options.exit_on_forward_failure) cleanup_exit(255); } debug_f("tunnel forward established, id=%d", id); forwarding_success(); } static void ssh_init_stdio_forwarding(struct ssh *ssh) { Channel *c; int in, out; if (options.stdio_forward_host == NULL) return; debug3_f("%s:%d", options.stdio_forward_host, options.stdio_forward_port); if ((in = dup(STDIN_FILENO)) == -1 || (out = dup(STDOUT_FILENO)) == -1) fatal_f("dup() in/out failed"); if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host, options.stdio_forward_port, in, out, CHANNEL_NONBLOCK_STDIO)) == NULL) fatal_f("channel_connect_stdio_fwd failed"); channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0); channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL); } static void ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens, u_int num_opens) { u_int i; int port; char *addr, *arg, *oarg; int where = FORWARD_LOCAL; channel_clear_permission(ssh, FORWARD_ADM, where); if (num_opens == 0) return; /* permit any */ /* handle keywords: "any" / "none" */ if (num_opens == 1 && strcmp(opens[0], "any") == 0) return; if (num_opens == 1 && strcmp(opens[0], "none") == 0) { channel_disable_admin(ssh, where); return; } /* Otherwise treat it as a list of permitted host:port */ for (i = 0; i < num_opens; i++) { oarg = arg = xstrdup(opens[i]); addr = hpdelim(&arg); if (addr == NULL) fatal_f("missing host in %s", what); addr = cleanhostname(addr); if (arg == NULL || ((port = permitopen_port(arg)) < 0)) fatal_f("bad port number in %s", what); /* Send it to channels layer */ channel_add_permission(ssh, FORWARD_ADM, where, addr, port); free(oarg); } } static void ssh_init_forwarding(struct ssh *ssh, char **ifname) { int success = 0; int i; ssh_init_forward_permissions(ssh, "permitremoteopen", options.permitted_remote_opens, options.num_permitted_remote_opens); if (options.exit_on_forward_failure) forward_confirms_pending = 0; /* track pending requests */ /* Initiate local TCP/IP port forwardings. */ for (i = 0; i < options.num_local_forwards; i++) { debug("Local connections to %.200s:%d forwarded to remote " "address %.200s:%d", (options.local_forwards[i].listen_path != NULL) ? options.local_forwards[i].listen_path : (options.local_forwards[i].listen_host == NULL) ? (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") : options.local_forwards[i].listen_host, options.local_forwards[i].listen_port, (options.local_forwards[i].connect_path != NULL) ? options.local_forwards[i].connect_path : options.local_forwards[i].connect_host, options.local_forwards[i].connect_port); success += channel_setup_local_fwd_listener(ssh, &options.local_forwards[i], &options.fwd_opts); } if (i > 0 && success != i && options.exit_on_forward_failure) fatal("Could not request local forwarding."); if (i > 0 && success == 0) error("Could not request local forwarding."); /* Initiate remote TCP/IP port forwardings. */ for (i = 0; i < options.num_remote_forwards; i++) { debug("Remote connections from %.200s:%d forwarded to " "local address %.200s:%d", (options.remote_forwards[i].listen_path != NULL) ? options.remote_forwards[i].listen_path : (options.remote_forwards[i].listen_host == NULL) ? "LOCALHOST" : options.remote_forwards[i].listen_host, options.remote_forwards[i].listen_port, (options.remote_forwards[i].connect_path != NULL) ? options.remote_forwards[i].connect_path : options.remote_forwards[i].connect_host, options.remote_forwards[i].connect_port); if ((options.remote_forwards[i].handle = channel_request_remote_forwarding(ssh, &options.remote_forwards[i])) >= 0) { client_register_global_confirm( ssh_confirm_remote_forward, &options.remote_forwards[i]); forward_confirms_pending++; } else if (options.exit_on_forward_failure) fatal("Could not request remote forwarding."); else logit("Warning: Could not request remote forwarding."); } /* Initiate tunnel forwarding. */ if (options.tun_open != SSH_TUNMODE_NO) { if ((*ifname = client_request_tun_fwd(ssh, options.tun_open, options.tun_local, options.tun_remote, ssh_tun_confirm, NULL)) != NULL) forward_confirms_pending++; else if (options.exit_on_forward_failure) fatal("Could not request tunnel forwarding."); else error("Could not request tunnel forwarding."); } if (forward_confirms_pending > 0) { debug_f("expecting replies for %d forwards", forward_confirms_pending); } } static void check_agent_present(void) { int r; if (options.forward_agent) { /* Clear agent forwarding if we don't have an agent. */ if ((r = ssh_get_authentication_socket(NULL)) != 0) { options.forward_agent = 0; if (r != SSH_ERR_AGENT_NOT_PRESENT) debug_r(r, "ssh_get_authentication_socket"); } } } static void ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg) { extern char **environ; const char *display, *term; int r, interactive = tty_flag; char *proto = NULL, *data = NULL; if (!success) return; /* No need for error message, channels code sens one */ display = getenv("DISPLAY"); if (display == NULL && options.forward_x11) debug("X11 forwarding requested but DISPLAY not set"); if (options.forward_x11 && client_x11_get_proto(ssh, display, options.xauth_location, options.forward_x11_trusted, options.forward_x11_timeout, &proto, &data) == 0) { /* Request forwarding with authentication spoofing. */ debug("Requesting X11 forwarding with authentication " "spoofing."); x11_request_forwarding_with_spoofing(ssh, id, display, proto, data, 1); client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN); /* XXX exit_on_forward_failure */ interactive = 1; } check_agent_present(); if (options.forward_agent) { debug("Requesting authentication agent forwarding."); channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0); if ((r = sshpkt_send(ssh)) != 0) fatal_fr(r, "send packet"); } /* Tell the packet module whether this is an interactive session. */ ssh_packet_set_interactive(ssh, interactive, options.ip_qos_interactive, options.ip_qos_bulk); if ((term = lookup_env_in_list("TERM", options.setenv, options.num_setenv)) == NULL || *term == '\0') term = getenv("TERM"); client_session2_setup(ssh, id, tty_flag, options.session_type == SESSION_TYPE_SUBSYSTEM, term, NULL, fileno(stdin), command, environ); } /* open new channel for a session */ static int ssh_session2_open(struct ssh *ssh) { Channel *c; int window, packetmax, in, out, err; if (options.stdin_null) { in = open(_PATH_DEVNULL, O_RDONLY); } else { in = dup(STDIN_FILENO); } out = dup(STDOUT_FILENO); err = dup(STDERR_FILENO); if (in == -1 || out == -1 || err == -1) fatal("dup() in/out/err failed"); window = CHAN_SES_WINDOW_DEFAULT; packetmax = CHAN_SES_PACKET_DEFAULT; if (tty_flag) { window >>= 1; packetmax >>= 1; } c = channel_new(ssh, "session", SSH_CHANNEL_OPENING, in, out, err, window, packetmax, CHAN_EXTENDED_WRITE, "client-session", CHANNEL_NONBLOCK_STDIO); debug3_f("channel_new: %d", c->self); channel_send_open(ssh, c->self); if (options.session_type != SESSION_TYPE_NONE) channel_register_open_confirm(ssh, c->self, ssh_session2_setup, NULL); return c->self; } static int ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo) { int r, id = -1; char *cp, *tun_fwd_ifname = NULL; /* XXX should be pre-session */ if (!options.control_persist) ssh_init_stdio_forwarding(ssh); ssh_init_forwarding(ssh, &tun_fwd_ifname); if (options.local_command != NULL) { debug3("expanding LocalCommand: %s", options.local_command); cp = options.local_command; options.local_command = percent_expand(cp, DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo), "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname, (char *)NULL); debug3("expanded LocalCommand: %s", options.local_command); free(cp); } /* Start listening for multiplex clients */ if (!ssh_packet_get_mux(ssh)) muxserver_listen(ssh); /* * If we are in control persist mode and have a working mux listen * socket, then prepare to background ourselves and have a foreground * client attach as a control client. * NB. we must save copies of the flags that we override for * the backgrounding, since we defer attachment of the client until * after the connection is fully established (in particular, * async rfwd replies have been received for ExitOnForwardFailure). */ if (options.control_persist && muxserver_sock != -1) { ostdin_null_flag = options.stdin_null; osession_type = options.session_type; orequest_tty = options.request_tty; otty_flag = tty_flag; options.stdin_null = 1; options.session_type = SESSION_TYPE_NONE; tty_flag = 0; if (!options.fork_after_authentication && (osession_type != SESSION_TYPE_NONE || options.stdio_forward_host != NULL)) need_controlpersist_detach = 1; options.fork_after_authentication = 1; } /* * ControlPersist mux listen socket setup failed, attempt the * stdio forward setup that we skipped earlier. */ if (options.control_persist && muxserver_sock == -1) ssh_init_stdio_forwarding(ssh); if (options.session_type != SESSION_TYPE_NONE) id = ssh_session2_open(ssh); else { ssh_packet_set_interactive(ssh, options.control_master == SSHCTL_MASTER_NO, options.ip_qos_interactive, options.ip_qos_bulk); } /* If we don't expect to open a new session, then disallow it */ if (options.control_master == SSHCTL_MASTER_NO && (ssh->compat & SSH_NEW_OPENSSH)) { debug("Requesting no-more-sessions@openssh.com"); if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 || (r = sshpkt_put_cstring(ssh, "no-more-sessions@openssh.com")) != 0 || (r = sshpkt_put_u8(ssh, 0)) != 0 || (r = sshpkt_send(ssh)) != 0) fatal_fr(r, "send packet"); } /* Execute a local command */ if (options.local_command != NULL && options.permit_local_command) ssh_local_cmd(options.local_command); /* * stdout is now owned by the session channel; clobber it here * so future channel closes are propagated to the local fd. * NB. this can only happen after LocalCommand has completed, * as it may want to write to stdout. */ if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1) error_f("stdfd_devnull failed"); /* * If requested and we are not interested in replies to remote * forwarding requests, then let ssh continue in the background. */ if (options.fork_after_authentication) { if (options.exit_on_forward_failure && options.num_remote_forwards > 0) { debug("deferring postauth fork until remote forward " "confirmation received"); } else fork_postauth(); } return client_loop(ssh, tty_flag, tty_flag ? options.escape_char : SSH_ESCAPECHAR_NONE, id); } /* Loads all IdentityFile and CertificateFile keys */ static void load_public_identity_files(const struct ssh_conn_info *cinfo) { char *filename, *cp; struct sshkey *public; int i; u_int n_ids, n_certs; char *identity_files[SSH_MAX_IDENTITY_FILES]; struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES]; int identity_file_userprovided[SSH_MAX_IDENTITY_FILES]; char *certificate_files[SSH_MAX_CERTIFICATE_FILES]; struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES]; int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES]; #ifdef ENABLE_PKCS11 struct sshkey **keys = NULL; char **comments = NULL; int nkeys; #endif /* PKCS11 */ n_ids = n_certs = 0; memset(identity_files, 0, sizeof(identity_files)); memset(identity_keys, 0, sizeof(identity_keys)); memset(identity_file_userprovided, 0, sizeof(identity_file_userprovided)); memset(certificate_files, 0, sizeof(certificate_files)); memset(certificates, 0, sizeof(certificates)); memset(certificate_file_userprovided, 0, sizeof(certificate_file_userprovided)); #ifdef ENABLE_PKCS11 if (options.pkcs11_provider != NULL && options.num_identity_files < SSH_MAX_IDENTITY_FILES && (pkcs11_init(!options.batch_mode) == 0) && (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL, &keys, &comments)) > 0) { for (i = 0; i < nkeys; i++) { if (n_ids >= SSH_MAX_IDENTITY_FILES) { sshkey_free(keys[i]); free(comments[i]); continue; } identity_keys[n_ids] = keys[i]; identity_files[n_ids] = comments[i]; /* transferred */ n_ids++; } free(keys); free(comments); } #endif /* ENABLE_PKCS11 */ for (i = 0; i < options.num_identity_files; i++) { if (n_ids >= SSH_MAX_IDENTITY_FILES || strcasecmp(options.identity_files[i], "none") == 0) { free(options.identity_files[i]); options.identity_files[i] = NULL; continue; } cp = tilde_expand_filename(options.identity_files[i], getuid()); filename = default_client_percent_dollar_expand(cp, cinfo); free(cp); check_load(sshkey_load_public(filename, &public, NULL), filename, "pubkey"); debug("identity file %s type %d", filename, public ? public->type : -1); free(options.identity_files[i]); identity_files[n_ids] = filename; identity_keys[n_ids] = public; identity_file_userprovided[n_ids] = options.identity_file_userprovided[i]; if (++n_ids >= SSH_MAX_IDENTITY_FILES) continue; /* * If no certificates have been explicitly listed then try * to add the default certificate variant too. */ if (options.num_certificate_files != 0) continue; xasprintf(&cp, "%s-cert", filename); check_load(sshkey_load_public(cp, &public, NULL), filename, "pubkey"); debug("identity file %s type %d", cp, public ? public->type : -1); if (public == NULL) { free(cp); continue; } if (!sshkey_is_cert(public)) { debug_f("key %s type %s is not a certificate", cp, sshkey_type(public)); sshkey_free(public); free(cp); continue; } /* NB. leave filename pointing to private key */ identity_files[n_ids] = xstrdup(filename); identity_keys[n_ids] = public; identity_file_userprovided[n_ids] = options.identity_file_userprovided[i]; n_ids++; } if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES) fatal_f("too many certificates"); for (i = 0; i < options.num_certificate_files; i++) { cp = tilde_expand_filename(options.certificate_files[i], getuid()); filename = default_client_percent_dollar_expand(cp, cinfo); free(cp); check_load(sshkey_load_public(filename, &public, NULL), filename, "certificate"); debug("certificate file %s type %d", filename, public ? public->type : -1); free(options.certificate_files[i]); options.certificate_files[i] = NULL; if (public == NULL) { free(filename); continue; } if (!sshkey_is_cert(public)) { debug_f("key %s type %s is not a certificate", filename, sshkey_type(public)); sshkey_free(public); free(filename); continue; } certificate_files[n_certs] = filename; certificates[n_certs] = public; certificate_file_userprovided[n_certs] = options.certificate_file_userprovided[i]; ++n_certs; } options.num_identity_files = n_ids; memcpy(options.identity_files, identity_files, sizeof(identity_files)); memcpy(options.identity_keys, identity_keys, sizeof(identity_keys)); memcpy(options.identity_file_userprovided, identity_file_userprovided, sizeof(identity_file_userprovided)); options.num_certificate_files = n_certs; memcpy(options.certificate_files, certificate_files, sizeof(certificate_files)); memcpy(options.certificates, certificates, sizeof(certificates)); memcpy(options.certificate_file_userprovided, certificate_file_userprovided, sizeof(certificate_file_userprovided)); } static void main_sigchld_handler(int sig) { int save_errno = errno; pid_t pid; int status; while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || (pid == -1 && errno == EINTR)) ; errno = save_errno; }