/* * Main program for the ssh client. */ int main(int ac, char **av) { int i, r, opt, exit_status, use_syslog; char *p, *cp, *line, *argv0, buf[MAXPATHLEN], *host_arg; char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV]; struct stat st; struct passwd *pw; int dummy, timeout_ms; extern int optind, optreset; extern char *optarg; struct servent *sp; Forward fwd; /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ sanitise_stdfd(); __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 /* * Discard other fds that are hanging around. These can cause problem * with backgrounded ssh processes started by ControlPersist. */ closefrom(STDERR_FILENO + 1); /* * Save the original real uid. It will be needed later (uid-swapping * may clobber the real uid). */ original_real_uid = getuid(); original_effective_uid = geteuid(); /* * Use uid-swapping to give up root privileges for the duration of * option processing. We will re-instantiate the rights when we are * ready to create the privileged port, and will permanently drop * them when the port has been created (actually, when the connection * has been made, as we may need to create the port several times). */ PRIV_END; #ifdef HAVE_SETRLIMIT /* If we are installed setuid root be careful to not drop core. */ if (original_real_uid != original_effective_uid) { struct rlimit rlim; rlim.rlim_cur = rlim.rlim_max = 0; if (setrlimit(RLIMIT_CORE, &rlim) < 0) fatal("setrlimit failed: %.100s", strerror(errno)); } #endif /* Get user data. */ pw = getpwuid(original_real_uid); if (!pw) { logit("You don't exist, go away!"); 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); /* * Initialize option structure to indicate that no values have been * set. */ initialize_options(&options); /* Parse command-line arguments. */ host = NULL; use_syslog = 0; argv0 = av[0]; again: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx" "ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -1) { switch (opt) { case '1': options.protocol = SSH_PROTO_1; break; case '2': options.protocol = SSH_PROTO_2; break; case '4': options.address_family = AF_INET; break; case '6': options.address_family = AF_INET6; break; case 'n': stdin_null_flag = 1; break; case 'f': fork_after_authentication_flag = 1; stdin_null_flag = 1; break; case 'x': options.forward_x11 = 0; break; case 'X': options.forward_x11 = 1; break; case 'y': use_syslog = 1; break; case 'Y': options.forward_x11 = 1; options.forward_x11_trusted = 1; break; case 'g': options.gateway_ports = 1; break; case 'O': if (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 fatal("Invalid multiplex command."); break; case 'P': /* deprecated */ options.use_privileged_port = 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': if (stat(optarg, &st) < 0) { fprintf(stderr, "Warning: Identity file %s " "not accessible: %s.\n", optarg, strerror(errno)); break; } if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) fatal("Too many identity files specified " "(max %d)", SSH_MAX_IDENTITY_FILES); options.identity_files[options.num_identity_files++] = xstrdup(optarg); break; case 'I': #ifdef ENABLE_PKCS11 options.pkcs11_provider = xstrdup(optarg); #else fprintf(stderr, "no support for PKCS#11.\n"); #endif 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) options.log_level++; break; } /* FALLTHROUGH */ case 'V': fprintf(stderr, "%s, %s\n", SSH_RELEASE, SSLeay_version(SSLEAY_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 (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)) { stdio_forward_host = fwd.listen_host; stdio_forward_port = fwd.listen_port; xfree(fwd.connect_host); } else { fprintf(stderr, "Bad stdio forwarding specification '%s'\n", optarg); exit(255); } options.request_tty = REQUEST_TTY_NO; no_shell_flag = 1; options.clear_forwardings = 1; options.exit_on_forward_failure = 1; 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)) { /* SSH2 only */ options.ciphers = xstrdup(optarg); options.cipher = SSH_CIPHER_INVALID; } else { /* SSH1 only */ options.cipher = cipher_number(optarg); if (options.cipher == -1) { fprintf(stderr, "Unknown cipher type '%s'\n", optarg); exit(255); } if (options.cipher == SSH_CIPHER_3DES) options.ciphers = "3des-cbc"; else if (options.cipher == SSH_CIPHER_BLOWFISH) options.ciphers = "blowfish-cbc"; else options.ciphers = (char *)-1; } break; case 'm': if (mac_valid(optarg)) 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': options.port = a2port(optarg); if (options.port <= 0) { fprintf(stderr, "Bad port '%s'\n", optarg); exit(255); } break; case 'l': 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)) { 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': options.compression = 1; break; case 'N': no_shell_flag = 1; options.request_tty = REQUEST_TTY_NO; break; case 'T': options.request_tty = REQUEST_TTY_NO; break; case 'o': dummy = 1; line = xstrdup(optarg); if (process_config_line(&options, host ? host : "", line, "command-line", 0, &dummy) != 0) exit(255); xfree(line); break; case 's': subsystem_flag = 1; break; case 'S': if (options.control_path != NULL) free(options.control_path); options.control_path = xstrdup(optarg); break; case 'b': options.bind_address = optarg; break; case 'F': config = optarg; break; default: usage(); } } ac -= optind; av += optind; if (ac > 0 && !host) { if (strrchr(*av, '@')) { p = xstrdup(*av); cp = strrchr(p, '@'); if (cp == NULL || cp == p) usage(); options.user = p; *cp = '\0'; host = ++cp; } else host = *av; if (ac > 1) { optind = optreset = 1; goto again; } ac--, av++; } /* Check that we got a host name. */ if (!host) usage(); OpenSSL_add_all_algorithms(); ERR_load_crypto_strings(); /* Initialize the command to execute on remote host. */ buffer_init(&command); if (options.request_tty == REQUEST_TTY_YES || options.request_tty == REQUEST_TTY_FORCE) tty_flag = 1; /* * 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. */ tty_flag = options.request_tty != REQUEST_TTY_NO; if (subsystem_flag) { 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 (i) buffer_append(&command, " ", 1); buffer_append(&command, av[i], strlen(av[i])); } } /* Cannot fork to background if no command. */ if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) fatal("Cannot fork into background without a command " "to execute."); /* Allocate a tty by default if no command specified. */ if (buffer_len(&command) == 0) tty_flag = options.request_tty != REQUEST_TTY_NO; /* Force no tty */ if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0) tty_flag = 0; /* Do not allocate a tty if stdin is not a tty. */ if ((!isatty(fileno(stdin)) || stdin_null_flag) && 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; } /* * Initialize "log" output. Since we are the client all output * actually goes to stderr. */ log_init(argv0, options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, SYSLOG_FACILITY_USER, !use_syslog); /* * Read per-user configuration file. Ignore the system wide config * file if the user specifies a config file on the command line. */ if (config != NULL) { if (!read_config_file(config, host, &options, 0)) 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, host, &options, 1); /* Read systemwide configuration file after user config. */ (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options, 0); } /* Fill configuration defaults. */ fill_default_options(&options); channel_set_af(options.address_family); /* reinit */ log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog); seed_rng(); if (options.user == NULL) options.user = xstrdup(pw->pw_name); /* Get default port if port has not been set. */ if (options.port == 0) { sp = getservbyname(SSH_SERVICE_NAME, "tcp"); options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; } /* preserve host name given on command line for %n expansion */ host_arg = host; if (options.hostname != NULL) { host = percent_expand(options.hostname, "h", host, (char *)NULL); } if (gethostname(thishost, sizeof(thishost)) == -1) fatal("gethostname: %s", strerror(errno)); strlcpy(shorthost, thishost, sizeof(shorthost)); shorthost[strcspn(thishost, ".")] = '\0'; snprintf(portstr, sizeof(portstr), "%d", options.port); if (options.local_command != NULL) { debug3("expanding LocalCommand: %s", options.local_command); cp = options.local_command; options.local_command = percent_expand(cp, "d", pw->pw_dir, "h", host, "l", thishost, "n", host_arg, "r", options.user, "p", portstr, "u", pw->pw_name, "L", shorthost, (char *)NULL); debug3("expanded LocalCommand: %s", options.local_command); xfree(cp); } /* force lowercase for hostkey matching */ if (options.host_key_alias != NULL) { for (p = options.host_key_alias; *p; p++) if (isupper(*p)) *p = (char)tolower(*p); } if (options.proxy_command != NULL && strcmp(options.proxy_command, "none") == 0) { xfree(options.proxy_command); options.proxy_command = NULL; } if (options.control_path != NULL && strcmp(options.control_path, "none") == 0) { xfree(options.control_path); options.control_path = NULL; } if (options.control_path != NULL) { cp = tilde_expand_filename(options.control_path, original_real_uid); xfree(options.control_path); options.control_path = percent_expand(cp, "h", host, "l", thishost, "n", host_arg, "r", options.user, "p", portstr, "u", pw->pw_name, "L", shorthost, (char *)NULL); xfree(cp); } if (muxclient_command != 0 && options.control_path == NULL) fatal("No ControlPath specified for \"-O\" command"); if (options.control_path != NULL) muxclient(options.control_path); timeout_ms = options.connection_timeout * 1000; /* Open a connection to the remote host. */ if (ssh_connect(host, &hostaddr, options.port, options.address_family, options.connection_attempts, &timeout_ms, options.tcp_keep_alive, #ifdef HAVE_CYGWIN options.use_privileged_port, #else original_effective_uid == 0 && options.use_privileged_port, #endif options.proxy_command) != 0) exit(255); if (timeout_ms > 0) debug3("timeout: %d ms remain after connect", timeout_ms); /* * If we successfully made the connection, load the host private key * in case we will need it later for combined rsa-rhosts * authentication. This must be done before releasing extra * privileges, because the file is only readable by root. * If we cannot access the private keys, load the public keys * instead and try to execute the ssh-keysign helper instead. */ sensitive_data.nkeys = 0; sensitive_data.keys = NULL; sensitive_data.external_keysign = 0; if (options.rhosts_rsa_authentication || options.hostbased_authentication) { sensitive_data.nkeys = 7; sensitive_data.keys = xcalloc(sensitive_data.nkeys, sizeof(Key)); for (i = 0; i < sensitive_data.nkeys; i++) sensitive_data.keys[i] = NULL; PRIV_START; sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, _PATH_HOST_KEY_FILE, "", NULL, NULL); sensitive_data.keys[1] = key_load_private_cert(KEY_DSA, _PATH_HOST_DSA_KEY_FILE, "", NULL); #ifdef OPENSSL_HAS_ECC sensitive_data.keys[2] = key_load_private_cert(KEY_ECDSA, _PATH_HOST_ECDSA_KEY_FILE, "", NULL); #endif sensitive_data.keys[3] = key_load_private_cert(KEY_RSA, _PATH_HOST_RSA_KEY_FILE, "", NULL); sensitive_data.keys[4] = key_load_private_type(KEY_DSA, _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); #ifdef OPENSSL_HAS_ECC sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA, _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL); #endif sensitive_data.keys[6] = key_load_private_type(KEY_RSA, _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); PRIV_END; if (options.hostbased_authentication == 1 && sensitive_data.keys[0] == NULL && sensitive_data.keys[4] == NULL && sensitive_data.keys[5] == NULL && sensitive_data.keys[6] == NULL) { sensitive_data.keys[1] = key_load_cert( _PATH_HOST_DSA_KEY_FILE); #ifdef OPENSSL_HAS_ECC sensitive_data.keys[2] = key_load_cert( _PATH_HOST_ECDSA_KEY_FILE); #endif sensitive_data.keys[3] = key_load_cert( _PATH_HOST_RSA_KEY_FILE); sensitive_data.keys[4] = key_load_public( _PATH_HOST_DSA_KEY_FILE, NULL); #ifdef OPENSSL_HAS_ECC sensitive_data.keys[5] = key_load_public( _PATH_HOST_ECDSA_KEY_FILE, NULL); #endif sensitive_data.keys[6] = key_load_public( _PATH_HOST_RSA_KEY_FILE, NULL); sensitive_data.external_keysign = 1; } } /* * Get rid of any extra privileges that we may have. We will no * longer need them. Also, extra privileges could make it very hard * to read identity files and other non-world-readable files from the * user's home directory if it happens to be on a NFS volume where * root is mapped to nobody. */ if (original_effective_uid == 0) { PRIV_START; permanently_set_uid(pw); } /* * Now that we are back to our own permissions, create ~/.ssh * directory if it doesn't already exist. */ if (config == NULL) { r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) { #ifdef WITH_SELINUX ssh_selinux_setfscreatecon(buf); #endif if (mkdir(buf, 0700) < 0) error("Could not create directory '%.200s'.", buf); #ifdef WITH_SELINUX ssh_selinux_setfscreatecon(NULL); #endif } } /* load options.identity_files */ load_public_identity_files(); /* 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); signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ signal(SIGCHLD, main_sigchld_handler); /* Log into the remote system. Never returns if the login fails. */ ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, options.port, pw, timeout_ms); if (packet_connection_is_on_socket()) { verbose("Authenticated to %s ([%s]:%d).", host, get_remote_ipaddr(), get_remote_port()); } else { verbose("Authenticated to %s (via proxy).", host); } /* 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); key_free(sensitive_data.keys[i]); sensitive_data.keys[i] = NULL; } } xfree(sensitive_data.keys); } for (i = 0; i < options.num_identity_files; i++) { if (options.identity_files[i]) { xfree(options.identity_files[i]); options.identity_files[i] = NULL; } if (options.identity_keys[i]) { key_free(options.identity_keys[i]); options.identity_keys[i] = NULL; } } exit_status = compat20 ? ssh_session2() : ssh_session(); packet_close(); 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; }
/* * return 1 if access is granted, 0 if not. * side effect: sets key option flags */ int auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum) { struct ssh *ssh = active_state; /* XXX */ const char *cp; int i, r; /* reset options */ auth_clear_options(); if (!opts) return 1; while (*opts && *opts != ' ' && *opts != '\t') { if ((r = match_flag("cert-authority", 0, &opts, NULL)) != -1) { key_is_cert_authority = r; goto next_option; } if ((r = match_flag("restrict", 0, &opts, NULL)) != -1) { auth_debug_add("Key is restricted."); no_port_forwarding_flag = 1; no_agent_forwarding_flag = 1; no_x11_forwarding_flag = 1; no_pty_flag = 1; no_user_rc = 1; goto next_option; } if ((r = match_flag("port-forwarding", 1, &opts, "Port forwarding")) != -1) { no_port_forwarding_flag = r != 1; goto next_option; } if ((r = match_flag("agent-forwarding", 1, &opts, "Agent forwarding")) != -1) { no_agent_forwarding_flag = r != 1; goto next_option; } if ((r = match_flag("x11-forwarding", 1, &opts, "X11 forwarding")) != -1) { no_x11_forwarding_flag = r != 1; goto next_option; } if ((r = match_flag("pty", 1, &opts, "PTY allocation")) != -1) { no_pty_flag = r != 1; goto next_option; } if ((r = match_flag("user-rc", 1, &opts, "User rc execution")) != -1) { no_user_rc = r != 1; goto next_option; } cp = "command=\""; if (strncasecmp(opts, cp, strlen(cp)) == 0) { opts += strlen(cp); free(forced_command); forced_command = xmalloc(strlen(opts) + 1); i = 0; while (*opts) { if (*opts == '"') break; if (*opts == '\\' && opts[1] == '"') { opts += 2; forced_command[i++] = '"'; continue; } forced_command[i++] = *opts++; } if (!*opts) { debug("%.100s, line %lu: missing end quote", file, linenum); auth_debug_add("%.100s, line %lu: missing end quote", file, linenum); free(forced_command); forced_command = NULL; goto bad_option; } forced_command[i] = '\0'; auth_debug_add("Forced command."); opts++; goto next_option; } cp = "principals=\""; if (strncasecmp(opts, cp, strlen(cp)) == 0) { opts += strlen(cp); free(authorized_principals); authorized_principals = xmalloc(strlen(opts) + 1); i = 0; while (*opts) { if (*opts == '"') break; if (*opts == '\\' && opts[1] == '"') { opts += 2; authorized_principals[i++] = '"'; continue; } authorized_principals[i++] = *opts++; } if (!*opts) { debug("%.100s, line %lu: missing end quote", file, linenum); auth_debug_add("%.100s, line %lu: missing end quote", file, linenum); free(authorized_principals); authorized_principals = NULL; goto bad_option; } authorized_principals[i] = '\0'; auth_debug_add("principals: %.900s", authorized_principals); opts++; goto next_option; } cp = "environment=\""; if (strncasecmp(opts, cp, strlen(cp)) == 0) { char *s; struct envstring *new_envstring; opts += strlen(cp); s = xmalloc(strlen(opts) + 1); i = 0; while (*opts) { if (*opts == '"') break; if (*opts == '\\' && opts[1] == '"') { opts += 2; s[i++] = '"'; continue; } s[i++] = *opts++; } if (!*opts) { debug("%.100s, line %lu: missing end quote", file, linenum); auth_debug_add("%.100s, line %lu: missing end quote", file, linenum); free(s); goto bad_option; } s[i] = '\0'; opts++; if (options.permit_user_env) { auth_debug_add("Adding to environment: " "%.900s", s); debug("Adding to environment: %.900s", s); new_envstring = xcalloc(1, sizeof(*new_envstring)); new_envstring->s = s; new_envstring->next = custom_environment; custom_environment = new_envstring; s = NULL; } free(s); goto next_option; } cp = "from=\""; if (strncasecmp(opts, cp, strlen(cp)) == 0) { const char *remote_ip = ssh_remote_ipaddr(ssh); const char *remote_host = auth_get_canonical_hostname( ssh, options.use_dns); char *patterns = xmalloc(strlen(opts) + 1); opts += strlen(cp); i = 0; while (*opts) { if (*opts == '"') break; if (*opts == '\\' && opts[1] == '"') { opts += 2; patterns[i++] = '"'; continue; } patterns[i++] = *opts++; } if (!*opts) { debug("%.100s, line %lu: missing end quote", file, linenum); auth_debug_add("%.100s, line %lu: missing end quote", file, linenum); free(patterns); goto bad_option; } patterns[i] = '\0'; opts++; switch (match_host_and_ip(remote_host, remote_ip, patterns)) { case 1: free(patterns); /* Host name matches. */ goto next_option; case -1: debug("%.100s, line %lu: invalid criteria", file, linenum); auth_debug_add("%.100s, line %lu: " "invalid criteria", file, linenum); /* FALLTHROUGH */ case 0: free(patterns); logit("Authentication tried for %.100s with " "correct key but not from a permitted " "host (host=%.200s, ip=%.200s).", pw->pw_name, remote_host, remote_ip); auth_debug_add("Your host '%.200s' is not " "permitted to use this key for login.", remote_host); break; } /* deny access */ return 0; } cp = "permitopen=\""; if (strncasecmp(opts, cp, strlen(cp)) == 0) { char *host, *p; int port; char *patterns = xmalloc(strlen(opts) + 1); opts += strlen(cp); i = 0; while (*opts) { if (*opts == '"') break; if (*opts == '\\' && opts[1] == '"') { opts += 2; patterns[i++] = '"'; continue; } patterns[i++] = *opts++; } if (!*opts) { debug("%.100s, line %lu: missing end quote", file, linenum); auth_debug_add("%.100s, line %lu: missing " "end quote", file, linenum); free(patterns); goto bad_option; } patterns[i] = '\0'; opts++; p = patterns; /* XXX - add streamlocal support */ host = hpdelim(&p); if (host == NULL || strlen(host) >= NI_MAXHOST) { debug("%.100s, line %lu: Bad permitopen " "specification <%.100s>", file, linenum, patterns); auth_debug_add("%.100s, line %lu: " "Bad permitopen specification", file, linenum); free(patterns); goto bad_option; } host = cleanhostname(host); if (p == NULL || (port = permitopen_port(p)) < 0) { debug("%.100s, line %lu: Bad permitopen port " "<%.100s>", file, linenum, p ? p : ""); auth_debug_add("%.100s, line %lu: " "Bad permitopen port", file, linenum); free(patterns); goto bad_option; } if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0) channel_add_permitted_opens(host, port); free(patterns); goto next_option; } cp = "tunnel=\""; if (strncasecmp(opts, cp, strlen(cp)) == 0) { char *tun = NULL; opts += strlen(cp); tun = xmalloc(strlen(opts) + 1); i = 0; while (*opts) { if (*opts == '"') break; tun[i++] = *opts++; } if (!*opts) { debug("%.100s, line %lu: missing end quote", file, linenum); auth_debug_add("%.100s, line %lu: missing end quote", file, linenum); free(tun); forced_tun_device = -1; goto bad_option; } tun[i] = '\0'; forced_tun_device = a2tun(tun, NULL); free(tun); if (forced_tun_device == SSH_TUNID_ERR) { debug("%.100s, line %lu: invalid tun device", file, linenum); auth_debug_add("%.100s, line %lu: invalid tun device", file, linenum); forced_tun_device = -1; goto bad_option; } auth_debug_add("Forced tun device: %d", forced_tun_device); opts++; goto next_option; } next_option: /* * Skip the comma, and move to the next option * (or break out if there are no more). */ if (!*opts) fatal("Bugs in auth-options.c option processing."); if (*opts == ' ' || *opts == '\t') break; /* End of options. */ if (*opts != ',') goto bad_option; opts++; /* Process the next option. */ } /* grant access */ return 1; bad_option: logit("Bad options in %.100s file, line %lu: %.50s", file, linenum, opts); auth_debug_add("Bad options in %.100s file, line %lu: %.50s", file, linenum, opts); /* deny access */ return 0; }
int process_config_line(Options *options, const char *host, char *line, const char *filename, int linenum, int *activep) { char *s, **charptr, *endofnumber, *keyword, *arg, *arg2, fwdarg[256]; int opcode, *intptr, value, value2, scale; LogLevel *log_level_ptr; long long orig, val64; size_t len; Forward fwd; /* Strip trailing whitespace */ for (len = strlen(line) - 1; len > 0; len--) { if (strchr(WHITESPACE, line[len]) == NULL) break; line[len] = '\0'; } s = line; /* Get the keyword. (Each line is supposed to begin with a keyword). */ if ((keyword = strdelim(&s)) == NULL) return 0; /* Ignore leading whitespace. */ if (*keyword == '\0') keyword = strdelim(&s); if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') return 0; opcode = parse_token(keyword, filename, linenum); switch (opcode) { case oBadOption: /* don't panic, but count bad options */ return -1; /* NOTREACHED */ case oConnectTimeout: intptr = &options->connection_timeout; parse_time: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%s line %d: missing time value.", filename, linenum); if ((value = convtime(arg)) == -1) fatal("%s line %d: invalid time value.", filename, linenum); if (*activep && *intptr == -1) *intptr = value; break; case oForwardAgent: intptr = &options->forward_agent; parse_flag: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); value = 0; /* To avoid compiler warning... */ if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) value = 1; else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) value = 0; else fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); if (*activep && *intptr == -1) *intptr = value; break; case oForwardX11: intptr = &options->forward_x11; goto parse_flag; case oForwardX11Trusted: intptr = &options->forward_x11_trusted; goto parse_flag; case oForwardX11Timeout: intptr = &options->forward_x11_timeout; goto parse_time; case oGatewayPorts: intptr = &options->gateway_ports; goto parse_flag; case oExitOnForwardFailure: intptr = &options->exit_on_forward_failure; goto parse_flag; case oUsePrivilegedPort: intptr = &options->use_privileged_port; goto parse_flag; case oPasswordAuthentication: intptr = &options->password_authentication; goto parse_flag; case oZeroKnowledgePasswordAuthentication: intptr = &options->zero_knowledge_password_authentication; goto parse_flag; case oKbdInteractiveAuthentication: intptr = &options->kbd_interactive_authentication; goto parse_flag; case oKbdInteractiveDevices: charptr = &options->kbd_interactive_devices; goto parse_string; case oPubkeyAuthentication: intptr = &options->pubkey_authentication; goto parse_flag; case oRSAAuthentication: intptr = &options->rsa_authentication; goto parse_flag; case oRhostsRSAAuthentication: intptr = &options->rhosts_rsa_authentication; goto parse_flag; case oHostbasedAuthentication: intptr = &options->hostbased_authentication; goto parse_flag; case oChallengeResponseAuthentication: intptr = &options->challenge_response_authentication; goto parse_flag; case oGssAuthentication: intptr = &options->gss_authentication; goto parse_flag; case oGssKeyEx: intptr = &options->gss_keyex; goto parse_flag; case oGssDelegateCreds: intptr = &options->gss_deleg_creds; goto parse_flag; case oGssTrustDns: intptr = &options->gss_trust_dns; goto parse_flag; case oGssClientIdentity: charptr = &options->gss_client_identity; goto parse_string; case oGssServerIdentity: charptr = &options->gss_server_identity; goto parse_string; case oGssRenewalRekey: intptr = &options->gss_renewal_rekey; goto parse_flag; case oBatchMode: intptr = &options->batch_mode; goto parse_flag; case oCheckHostIP: intptr = &options->check_host_ip; goto parse_flag; case oVerifyHostKeyDNS: intptr = &options->verify_host_key_dns; goto parse_yesnoask; case oStrictHostKeyChecking: intptr = &options->strict_host_key_checking; parse_yesnoask: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing yes/no/ask argument.", filename, linenum); value = 0; /* To avoid compiler warning... */ if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) value = 1; else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) value = 0; else if (strcmp(arg, "ask") == 0) value = 2; else fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); if (*activep && *intptr == -1) *intptr = value; break; case oCompression: intptr = &options->compression; goto parse_flag; case oTCPKeepAlive: intptr = &options->tcp_keep_alive; goto parse_flag; case oNoHostAuthenticationForLocalhost: intptr = &options->no_host_authentication_for_localhost; goto parse_flag; case oNumberOfPasswordPrompts: intptr = &options->number_of_password_prompts; goto parse_int; case oCompressionLevel: intptr = &options->compression_level; goto parse_int; case oRekeyLimit: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (arg[0] < '0' || arg[0] > '9') fatal("%.200s line %d: Bad number.", filename, linenum); orig = val64 = strtoll(arg, &endofnumber, 10); if (arg == endofnumber) fatal("%.200s line %d: Bad number.", filename, linenum); switch (toupper(*endofnumber)) { case '\0': scale = 1; break; case 'K': scale = 1<<10; break; case 'M': scale = 1<<20; break; case 'G': scale = 1<<30; break; default: fatal("%.200s line %d: Invalid RekeyLimit suffix", filename, linenum); } val64 *= scale; /* detect integer wrap and too-large limits */ if ((val64 / scale) != orig || val64 > UINT_MAX) fatal("%.200s line %d: RekeyLimit too large", filename, linenum); if (val64 < 16) fatal("%.200s line %d: RekeyLimit too small", filename, linenum); if (*activep && options->rekey_limit == -1) options->rekey_limit = (u_int32_t)val64; break; case oIdentityFile: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (*activep) { intptr = &options->num_identity_files; if (*intptr >= SSH_MAX_IDENTITY_FILES) fatal("%.200s line %d: Too many identity files specified (max %d).", filename, linenum, SSH_MAX_IDENTITY_FILES); charptr = &options->identity_files[*intptr]; *charptr = xstrdup(arg); *intptr = *intptr + 1; } break; case oXAuthLocation: charptr=&options->xauth_location; goto parse_string; case oUser: charptr = &options->user; parse_string: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (*activep && *charptr == NULL) *charptr = xstrdup(arg); break; case oGlobalKnownHostsFile: charptr = &options->system_hostfile; goto parse_string; case oUserKnownHostsFile: charptr = &options->user_hostfile; goto parse_string; case oGlobalKnownHostsFile2: charptr = &options->system_hostfile2; goto parse_string; case oUserKnownHostsFile2: charptr = &options->user_hostfile2; goto parse_string; case oHostName: charptr = &options->hostname; goto parse_string; case oHostKeyAlias: charptr = &options->host_key_alias; goto parse_string; case oPreferredAuthentications: charptr = &options->preferred_authentications; goto parse_string; case oBindAddress: charptr = &options->bind_address; goto parse_string; case oPKCS11Provider: charptr = &options->pkcs11_provider; goto parse_string; case oProxyCommand: charptr = &options->proxy_command; parse_command: if (s == NULL) fatal("%.200s line %d: Missing argument.", filename, linenum); len = strspn(s, WHITESPACE "="); if (*activep && *charptr == NULL) *charptr = xstrdup(s + len); return 0; case oPort: intptr = &options->port; parse_int: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (arg[0] < '0' || arg[0] > '9') fatal("%.200s line %d: Bad number.", filename, linenum); /* Octal, decimal, or hex format? */ value = strtol(arg, &endofnumber, 0); if (arg == endofnumber) fatal("%.200s line %d: Bad number.", filename, linenum); if (*activep && *intptr == -1) *intptr = value; break; case oConnectionAttempts: intptr = &options->connection_attempts; goto parse_int; case oCipher: intptr = &options->cipher; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); value = cipher_number(arg); if (value == -1) fatal("%.200s line %d: Bad cipher '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && *intptr == -1) *intptr = value; break; case oCiphers: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (!ciphers_valid(arg)) fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && options->ciphers == NULL) options->ciphers = xstrdup(arg); break; case oMacs: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (!mac_valid(arg)) fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && options->macs == NULL) options->macs = xstrdup(arg); break; case oKexAlgorithms: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (!kex_names_valid(arg)) fatal("%.200s line %d: Bad SSH2 KexAlgorithms '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && options->kex_algorithms == NULL) options->kex_algorithms = xstrdup(arg); break; case oHostKeyAlgorithms: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (!key_names_valid2(arg)) fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && options->hostkeyalgorithms == NULL) options->hostkeyalgorithms = xstrdup(arg); break; case oProtocol: intptr = &options->protocol; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); value = proto_spec(arg); if (value == SSH_PROTO_UNKNOWN) fatal("%.200s line %d: Bad protocol spec '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && *intptr == SSH_PROTO_UNKNOWN) *intptr = value; break; case oLogLevel: log_level_ptr = &options->log_level; arg = strdelim(&s); value = log_level_number(arg); if (value == SYSLOG_LEVEL_NOT_SET) fatal("%.200s line %d: unsupported log level '%s'", filename, linenum, arg ? arg : "<NONE>"); if (*activep && *log_level_ptr == SYSLOG_LEVEL_NOT_SET) *log_level_ptr = (LogLevel) value; break; case oLocalForward: case oRemoteForward: case oDynamicForward: arg = strdelim(&s); if (arg == NULL || *arg == '\0') fatal("%.200s line %d: Missing port argument.", filename, linenum); if (opcode == oLocalForward || opcode == oRemoteForward) { arg2 = strdelim(&s); if (arg2 == NULL || *arg2 == '\0') fatal("%.200s line %d: Missing target argument.", filename, linenum); /* construct a string for parse_forward */ snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg, arg2); } else if (opcode == oDynamicForward) { strlcpy(fwdarg, arg, sizeof(fwdarg)); } if (parse_forward(&fwd, fwdarg, opcode == oDynamicForward ? 1 : 0, opcode == oRemoteForward ? 1 : 0) == 0) fatal("%.200s line %d: Bad forwarding specification.", filename, linenum); if (*activep) { if (opcode == oLocalForward || opcode == oDynamicForward) add_local_forward(options, &fwd); else if (opcode == oRemoteForward) add_remote_forward(options, &fwd); } break; case oClearAllForwardings: intptr = &options->clear_forwardings; goto parse_flag; case oHost: *activep = 0; while ((arg = strdelim(&s)) != NULL && *arg != '\0') if (match_pattern(host, arg)) { debug("Applying options for %.100s", arg); *activep = 1; break; } /* Avoid garbage check below, as strdelim is done. */ return 0; case oEscapeChar: intptr = &options->escape_char; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (arg[0] == '^' && arg[2] == 0 && (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) value = (u_char) arg[1] & 31; else if (strlen(arg) == 1) value = (u_char) arg[0]; else if (strcmp(arg, "none") == 0) value = SSH_ESCAPECHAR_NONE; else { fatal("%.200s line %d: Bad escape character.", filename, linenum); /* NOTREACHED */ value = 0; /* Avoid compiler warning. */ } if (*activep && *intptr == -1) *intptr = value; break; case oAddressFamily: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%s line %d: missing address family.", filename, linenum); intptr = &options->address_family; if (strcasecmp(arg, "inet") == 0) value = AF_INET; else if (strcasecmp(arg, "inet6") == 0) value = AF_INET6; else if (strcasecmp(arg, "any") == 0) value = AF_UNSPEC; else fatal("Unsupported AddressFamily \"%s\"", arg); if (*activep && *intptr == -1) *intptr = value; break; case oEnableSSHKeysign: intptr = &options->enable_ssh_keysign; goto parse_flag; case oIdentitiesOnly: intptr = &options->identities_only; goto parse_flag; case oServerAliveInterval: intptr = &options->server_alive_interval; goto parse_time; case oServerAliveCountMax: intptr = &options->server_alive_count_max; goto parse_int; case oSendEnv: while ((arg = strdelim(&s)) != NULL && *arg != '\0') { if (strchr(arg, '=') != NULL) fatal("%s line %d: Invalid environment name.", filename, linenum); if (!*activep) continue; if (options->num_send_env >= MAX_SEND_ENV) fatal("%s line %d: too many send env.", filename, linenum); options->send_env[options->num_send_env++] = xstrdup(arg); } break; case oControlPath: charptr = &options->control_path; goto parse_string; case oControlMaster: intptr = &options->control_master; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing ControlMaster argument.", filename, linenum); value = 0; /* To avoid compiler warning... */ if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) value = SSHCTL_MASTER_YES; else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) value = SSHCTL_MASTER_NO; else if (strcmp(arg, "auto") == 0) value = SSHCTL_MASTER_AUTO; else if (strcmp(arg, "ask") == 0) value = SSHCTL_MASTER_ASK; else if (strcmp(arg, "autoask") == 0) value = SSHCTL_MASTER_AUTO_ASK; else fatal("%.200s line %d: Bad ControlMaster argument.", filename, linenum); if (*activep && *intptr == -1) *intptr = value; break; case oControlPersist: /* no/false/yes/true, or a time spec */ intptr = &options->control_persist; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing ControlPersist" " argument.", filename, linenum); value = 0; value2 = 0; /* timeout */ if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) value = 0; else if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) value = 1; else if ((value2 = convtime(arg)) >= 0) value = 1; else fatal("%.200s line %d: Bad ControlPersist argument.", filename, linenum); if (*activep && *intptr == -1) { *intptr = value; options->control_persist_timeout = value2; } break; case oHashKnownHosts: intptr = &options->hash_known_hosts; goto parse_flag; case oTunnel: intptr = &options->tun_open; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%s line %d: Missing yes/point-to-point/" "ethernet/no argument.", filename, linenum); value = 0; /* silence compiler */ if (strcasecmp(arg, "ethernet") == 0) value = SSH_TUNMODE_ETHERNET; else if (strcasecmp(arg, "point-to-point") == 0) value = SSH_TUNMODE_POINTOPOINT; else if (strcasecmp(arg, "yes") == 0) value = SSH_TUNMODE_DEFAULT; else if (strcasecmp(arg, "no") == 0) value = SSH_TUNMODE_NO; else fatal("%s line %d: Bad yes/point-to-point/ethernet/" "no argument: %s", filename, linenum, arg); if (*activep) *intptr = value; break; case oTunnelDevice: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); value = a2tun(arg, &value2); if (value == SSH_TUNID_ERR) fatal("%.200s line %d: Bad tun device.", filename, linenum); if (*activep) { options->tun_local = value; options->tun_remote = value2; } break; case oLocalCommand: charptr = &options->local_command; goto parse_command; case oPermitLocalCommand: intptr = &options->permit_local_command; goto parse_flag; case oVisualHostKey: intptr = &options->visual_host_key; goto parse_flag; case oIPQoS: arg = strdelim(&s); if ((value = parse_ipqos(arg)) == -1) fatal("%s line %d: Bad IPQoS value: %s", filename, linenum, arg); arg = strdelim(&s); if (arg == NULL) value2 = value; else if ((value2 = parse_ipqos(arg)) == -1) fatal("%s line %d: Bad IPQoS value: %s", filename, linenum, arg); if (*activep) { options->ip_qos_interactive = value; options->ip_qos_bulk = value2; } break; case oUseRoaming: intptr = &options->use_roaming; goto parse_flag; case oDeprecated: debug("%s line %d: Deprecated option \"%s\"", filename, linenum, keyword); return 0; case oUnsupported: error("%s line %d: Unsupported option \"%s\"", filename, linenum, keyword); return 0; default: fatal("process_config_line: Unimplemented opcode %d", opcode); } /* Check that there is no garbage at end of line. */ if ((arg = strdelim(&s)) != NULL && *arg != '\0') { fatal("%.200s line %d: garbage at end of line; \"%.200s\".", filename, linenum, arg); } return 0; }
/* * return 1 if access is granted, 0 if not. * side effect: sets key option flags */ int auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum) { const char *cp; int i; /* reset options */ auth_clear_options(); if (!opts) return 1; while (*opts && *opts != ' ' && *opts != '\t') { cp = "no-port-forwarding"; if (strncasecmp(opts, cp, strlen(cp)) == 0) { auth_debug_add("Port forwarding disabled."); no_port_forwarding_flag = 1; opts += strlen(cp); goto next_option; } cp = "no-agent-forwarding"; if (strncasecmp(opts, cp, strlen(cp)) == 0) { auth_debug_add("Agent forwarding disabled."); no_agent_forwarding_flag = 1; opts += strlen(cp); goto next_option; } cp = "no-X11-forwarding"; if (strncasecmp(opts, cp, strlen(cp)) == 0) { auth_debug_add("X11 forwarding disabled."); no_x11_forwarding_flag = 1; opts += strlen(cp); goto next_option; } cp = "no-pty"; if (strncasecmp(opts, cp, strlen(cp)) == 0) { auth_debug_add("Pty allocation disabled."); no_pty_flag = 1; opts += strlen(cp); goto next_option; } cp = "command=\""; if (strncasecmp(opts, cp, strlen(cp)) == 0) { opts += strlen(cp); forced_command = xmalloc(strlen(opts) + 1); i = 0; while (*opts) { if (*opts == '"') break; if (*opts == '\\' && opts[1] == '"') { opts += 2; forced_command[i++] = '"'; continue; } forced_command[i++] = *opts++; } if (!*opts) { debug("%.100s, line %lu: missing end quote", file, linenum); auth_debug_add("%.100s, line %lu: missing end quote", file, linenum); xfree(forced_command); forced_command = NULL; goto bad_option; } forced_command[i] = '\0'; auth_debug_add("Forced command: %.900s", forced_command); opts++; goto next_option; } cp = "environment=\""; if (options.permit_user_env && strncasecmp(opts, cp, strlen(cp)) == 0) { char *s; struct envstring *new_envstring; opts += strlen(cp); s = xmalloc(strlen(opts) + 1); i = 0; while (*opts) { if (*opts == '"') break; if (*opts == '\\' && opts[1] == '"') { opts += 2; s[i++] = '"'; continue; } s[i++] = *opts++; } if (!*opts) { debug("%.100s, line %lu: missing end quote", file, linenum); auth_debug_add("%.100s, line %lu: missing end quote", file, linenum); xfree(s); goto bad_option; } s[i] = '\0'; auth_debug_add("Adding to environment: %.900s", s); debug("Adding to environment: %.900s", s); opts++; new_envstring = xmalloc(sizeof(struct envstring)); new_envstring->s = s; new_envstring->next = custom_environment; custom_environment = new_envstring; goto next_option; } cp = "from=\""; if (strncasecmp(opts, cp, strlen(cp)) == 0) { const char *remote_ip = get_remote_ipaddr(); const char *remote_host = get_canonical_hostname( options.use_dns); char *patterns = xmalloc(strlen(opts) + 1); opts += strlen(cp); i = 0; while (*opts) { if (*opts == '"') break; if (*opts == '\\' && opts[1] == '"') { opts += 2; patterns[i++] = '"'; continue; } patterns[i++] = *opts++; } if (!*opts) { debug("%.100s, line %lu: missing end quote", file, linenum); auth_debug_add("%.100s, line %lu: missing end quote", file, linenum); xfree(patterns); goto bad_option; } patterns[i] = '\0'; opts++; if (match_host_and_ip(remote_host, remote_ip, patterns) != 1) { xfree(patterns); logit("Authentication tried for %.100s with " "correct key but not from a permitted " "host (host=%.200s, ip=%.200s).", pw->pw_name, remote_host, remote_ip); auth_debug_add("Your host '%.200s' is not " "permitted to use this key for login.", remote_host); /* deny access */ return 0; } xfree(patterns); /* Host name matches. */ goto next_option; } cp = "permitopen=\""; if (strncasecmp(opts, cp, strlen(cp)) == 0) { char *host, *p; u_short port; char *patterns = xmalloc(strlen(opts) + 1); opts += strlen(cp); i = 0; while (*opts) { if (*opts == '"') break; if (*opts == '\\' && opts[1] == '"') { opts += 2; patterns[i++] = '"'; continue; } patterns[i++] = *opts++; } if (!*opts) { debug("%.100s, line %lu: missing end quote", file, linenum); auth_debug_add("%.100s, line %lu: missing " "end quote", file, linenum); xfree(patterns); goto bad_option; } patterns[i] = '\0'; opts++; p = patterns; host = hpdelim(&p); if (host == NULL || strlen(host) >= NI_MAXHOST) { debug("%.100s, line %lu: Bad permitopen " "specification <%.100s>", file, linenum, patterns); auth_debug_add("%.100s, line %lu: " "Bad permitopen specification", file, linenum); xfree(patterns); goto bad_option; } host = cleanhostname(host); if (p == NULL || (port = a2port(p)) == 0) { debug("%.100s, line %lu: Bad permitopen port " "<%.100s>", file, linenum, p ? p : ""); auth_debug_add("%.100s, line %lu: " "Bad permitopen port", file, linenum); xfree(patterns); goto bad_option; } if (options.allow_tcp_forwarding) channel_add_permitted_opens(host, port); xfree(patterns); goto next_option; } cp = "tunnel=\""; if (strncasecmp(opts, cp, strlen(cp)) == 0) { char *tun = NULL; opts += strlen(cp); tun = xmalloc(strlen(opts) + 1); i = 0; while (*opts) { if (*opts == '"') break; tun[i++] = *opts++; } if (!*opts) { debug("%.100s, line %lu: missing end quote", file, linenum); auth_debug_add("%.100s, line %lu: missing end quote", file, linenum); xfree(tun); forced_tun_device = -1; goto bad_option; } tun[i] = '\0'; forced_tun_device = a2tun(tun, NULL); xfree(tun); if (forced_tun_device == SSH_TUNID_ERR) { debug("%.100s, line %lu: invalid tun device", file, linenum); auth_debug_add("%.100s, line %lu: invalid tun device", file, linenum); forced_tun_device = -1; goto bad_option; } auth_debug_add("Forced tun device: %d", forced_tun_device); opts++; goto next_option; } next_option: /* * Skip the comma, and move to the next option * (or break out if there are no more). */ if (!*opts) fatal("Bugs in auth-options.c option processing."); if (*opts == ' ' || *opts == '\t') break; /* End of options. */ if (*opts != ',') goto bad_option; opts++; /* Process the next option. */ } if (!use_privsep) auth_debug_send(); /* grant access */ return 1; bad_option: logit("Bad options in %.100s file, line %lu: %.50s", file, linenum, opts); auth_debug_add("Bad options in %.100s file, line %lu: %.50s", file, linenum, opts); if (!use_privsep) auth_debug_send(); /* deny access */ return 0; }
int process_config_line(Options *options, const char *host, char *line, const char *filename, int linenum, int *activep, int userconfig) { char *s, **charptr, *endofnumber, *keyword, *arg, *arg2; char **cpptr, fwdarg[256]; u_int i, *uintptr, max_entries = 0; int negated, opcode, *intptr, value, value2; LogLevel *log_level_ptr; long long val64; size_t len; Forward fwd; /* Strip trailing whitespace */ for (len = strlen(line) - 1; len > 0; len--) { if (strchr(WHITESPACE, line[len]) == NULL) break; line[len] = '\0'; } s = line; /* Get the keyword. (Each line is supposed to begin with a keyword). */ if ((keyword = strdelim(&s)) == NULL) return 0; /* Ignore leading whitespace. */ if (*keyword == '\0') keyword = strdelim(&s); if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') return 0; /* Match lowercase keyword */ for (i = 0; i < strlen(keyword); i++) keyword[i] = tolower(keyword[i]); opcode = parse_token(keyword, filename, linenum, options->ignored_unknown); switch (opcode) { case oBadOption: /* don't panic, but count bad options */ return -1; /* NOTREACHED */ case oIgnoredUnknownOption: debug("%s line %d: Ignored unknown option \"%s\"", filename, linenum, keyword); return 0; case oConnectTimeout: intptr = &options->connection_timeout; parse_time: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%s line %d: missing time value.", filename, linenum); if ((value = convtime(arg)) == -1) fatal("%s line %d: invalid time value.", filename, linenum); if (*activep && *intptr == -1) *intptr = value; break; case oForwardAgent: intptr = &options->forward_agent; parse_flag: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); value = 0; /* To avoid compiler warning... */ if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) value = 1; else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) value = 0; else fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); if (*activep && *intptr == -1) *intptr = value; break; case oForwardX11: intptr = &options->forward_x11; goto parse_flag; case oForwardX11Trusted: intptr = &options->forward_x11_trusted; goto parse_flag; case oForwardX11Timeout: intptr = &options->forward_x11_timeout; goto parse_time; case oGatewayPorts: intptr = &options->gateway_ports; goto parse_flag; case oExitOnForwardFailure: intptr = &options->exit_on_forward_failure; goto parse_flag; case oUsePrivilegedPort: intptr = &options->use_privileged_port; goto parse_flag; case oPasswordAuthentication: intptr = &options->password_authentication; goto parse_flag; case oZeroKnowledgePasswordAuthentication: intptr = &options->zero_knowledge_password_authentication; goto parse_flag; case oKbdInteractiveAuthentication: intptr = &options->kbd_interactive_authentication; goto parse_flag; case oKbdInteractiveDevices: charptr = &options->kbd_interactive_devices; goto parse_string; case oPubkeyAuthentication: intptr = &options->pubkey_authentication; goto parse_flag; case oRSAAuthentication: intptr = &options->rsa_authentication; goto parse_flag; case oRhostsRSAAuthentication: intptr = &options->rhosts_rsa_authentication; goto parse_flag; case oHostbasedAuthentication: intptr = &options->hostbased_authentication; goto parse_flag; case oChallengeResponseAuthentication: intptr = &options->challenge_response_authentication; goto parse_flag; case oGssAuthentication: intptr = &options->gss_authentication; goto parse_flag; case oGssDelegateCreds: intptr = &options->gss_deleg_creds; goto parse_flag; case oBatchMode: intptr = &options->batch_mode; goto parse_flag; case oCheckHostIP: intptr = &options->check_host_ip; goto parse_flag; case oVerifyHostKeyDNS: intptr = &options->verify_host_key_dns; goto parse_yesnoask; case oStrictHostKeyChecking: intptr = &options->strict_host_key_checking; parse_yesnoask: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing yes/no/ask argument.", filename, linenum); value = 0; /* To avoid compiler warning... */ if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) value = 1; else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) value = 0; else if (strcmp(arg, "ask") == 0) value = 2; else fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); if (*activep && *intptr == -1) *intptr = value; break; case oCompression: intptr = &options->compression; goto parse_flag; case oTCPKeepAlive: intptr = &options->tcp_keep_alive; goto parse_flag; case oNoHostAuthenticationForLocalhost: intptr = &options->no_host_authentication_for_localhost; goto parse_flag; case oNumberOfPasswordPrompts: intptr = &options->number_of_password_prompts; goto parse_int; case oCompressionLevel: intptr = &options->compression_level; goto parse_int; case oRekeyLimit: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (strcmp(arg, "default") == 0) { val64 = 0; } else { if (scan_scaled(arg, &val64) == -1) fatal("%.200s line %d: Bad number '%s': %s", filename, linenum, arg, strerror(errno)); /* check for too-large or too-small limits */ if (val64 > UINT_MAX) fatal("%.200s line %d: RekeyLimit too large", filename, linenum); if (val64 != 0 && val64 < 16) fatal("%.200s line %d: RekeyLimit too small", filename, linenum); } if (*activep && options->rekey_limit == -1) options->rekey_limit = (u_int32_t)val64; if (s != NULL) { /* optional rekey interval present */ if (strcmp(s, "none") == 0) { (void)strdelim(&s); /* discard */ break; } intptr = &options->rekey_interval; goto parse_time; } break; case oIdentityFile: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (*activep) { intptr = &options->num_identity_files; if (*intptr >= SSH_MAX_IDENTITY_FILES) fatal("%.200s line %d: Too many identity files specified (max %d).", filename, linenum, SSH_MAX_IDENTITY_FILES); add_identity_file(options, NULL, arg, userconfig); } break; case oXAuthLocation: charptr=&options->xauth_location; goto parse_string; case oUser: charptr = &options->user; parse_string: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (*activep && *charptr == NULL) *charptr = xstrdup(arg); break; case oGlobalKnownHostsFile: cpptr = (char **)&options->system_hostfiles; uintptr = &options->num_system_hostfiles; max_entries = SSH_MAX_HOSTS_FILES; parse_char_array: if (*activep && *uintptr == 0) { while ((arg = strdelim(&s)) != NULL && *arg != '\0') { if ((*uintptr) >= max_entries) fatal("%s line %d: " "too many authorized keys files.", filename, linenum); cpptr[(*uintptr)++] = xstrdup(arg); } } return 0; case oUserKnownHostsFile: cpptr = (char **)&options->user_hostfiles; uintptr = &options->num_user_hostfiles; max_entries = SSH_MAX_HOSTS_FILES; goto parse_char_array; case oHostName: charptr = &options->hostname; goto parse_string; case oHostKeyAlias: charptr = &options->host_key_alias; goto parse_string; case oPreferredAuthentications: charptr = &options->preferred_authentications; goto parse_string; case oBindAddress: charptr = &options->bind_address; goto parse_string; case oPKCS11Provider: charptr = &options->pkcs11_provider; goto parse_string; case oProxyCommand: charptr = &options->proxy_command; parse_command: if (s == NULL) fatal("%.200s line %d: Missing argument.", filename, linenum); len = strspn(s, WHITESPACE "="); if (*activep && *charptr == NULL) *charptr = xstrdup(s + len); return 0; case oPort: intptr = &options->port; parse_int: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (arg[0] < '0' || arg[0] > '9') fatal("%.200s line %d: Bad number.", filename, linenum); /* Octal, decimal, or hex format? */ value = strtol(arg, &endofnumber, 0); if (arg == endofnumber) fatal("%.200s line %d: Bad number.", filename, linenum); if (*activep && *intptr == -1) *intptr = value; break; case oConnectionAttempts: intptr = &options->connection_attempts; goto parse_int; case oCipher: intptr = &options->cipher; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); value = cipher_number(arg); if (value == -1) fatal("%.200s line %d: Bad cipher '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && *intptr == -1) *intptr = value; break; case oCiphers: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (!ciphers_valid(arg)) fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && options->ciphers == NULL) options->ciphers = xstrdup(arg); break; case oMacs: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (!mac_valid(arg)) fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && options->macs == NULL) options->macs = xstrdup(arg); break; case oKexAlgorithms: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (!kex_names_valid(arg)) fatal("%.200s line %d: Bad SSH2 KexAlgorithms '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && options->kex_algorithms == NULL) options->kex_algorithms = xstrdup(arg); break; case oHostKeyAlgorithms: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (!key_names_valid2(arg)) fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && options->hostkeyalgorithms == NULL) options->hostkeyalgorithms = xstrdup(arg); break; case oProtocol: intptr = &options->protocol; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); value = proto_spec(arg); if (value == SSH_PROTO_UNKNOWN) fatal("%.200s line %d: Bad protocol spec '%s'.", filename, linenum, arg ? arg : "<NONE>"); if (*activep && *intptr == SSH_PROTO_UNKNOWN) *intptr = value; break; case oLogLevel: log_level_ptr = &options->log_level; arg = strdelim(&s); value = log_level_number(arg); if (value == SYSLOG_LEVEL_NOT_SET) fatal("%.200s line %d: unsupported log level '%s'", filename, linenum, arg ? arg : "<NONE>"); if (*activep && *log_level_ptr == SYSLOG_LEVEL_NOT_SET) *log_level_ptr = (LogLevel) value; break; case oLocalForward: case oRemoteForward: case oDynamicForward: arg = strdelim(&s); if (arg == NULL || *arg == '\0') fatal("%.200s line %d: Missing port argument.", filename, linenum); if (opcode == oLocalForward || opcode == oRemoteForward) { arg2 = strdelim(&s); if (arg2 == NULL || *arg2 == '\0') fatal("%.200s line %d: Missing target argument.", filename, linenum); /* construct a string for parse_forward */ snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg, arg2); } else if (opcode == oDynamicForward) { strlcpy(fwdarg, arg, sizeof(fwdarg)); } if (parse_forward(&fwd, fwdarg, opcode == oDynamicForward ? 1 : 0, opcode == oRemoteForward ? 1 : 0) == 0) fatal("%.200s line %d: Bad forwarding specification.", filename, linenum); if (*activep) { if (opcode == oLocalForward || opcode == oDynamicForward) add_local_forward(options, &fwd); else if (opcode == oRemoteForward) add_remote_forward(options, &fwd); } break; case oClearAllForwardings: intptr = &options->clear_forwardings; goto parse_flag; case oHost: *activep = 0; arg2 = NULL; while ((arg = strdelim(&s)) != NULL && *arg != '\0') { negated = *arg == '!'; if (negated) arg++; if (match_pattern(host, arg)) { if (negated) { debug("%.200s line %d: Skipping Host " "block because of negated match " "for %.100s", filename, linenum, arg); *activep = 0; break; } if (!*activep) arg2 = arg; /* logged below */ *activep = 1; } } if (*activep) debug("%.200s line %d: Applying options for %.100s", filename, linenum, arg2); /* Avoid garbage check below, as strdelim is done. */ return 0; case oEscapeChar: intptr = &options->escape_char; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); if (arg[0] == '^' && arg[2] == 0 && (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) value = (u_char) arg[1] & 31; else if (strlen(arg) == 1) value = (u_char) arg[0]; else if (strcmp(arg, "none") == 0) value = SSH_ESCAPECHAR_NONE; else { fatal("%.200s line %d: Bad escape character.", filename, linenum); /* NOTREACHED */ value = 0; /* Avoid compiler warning. */ } if (*activep && *intptr == -1) *intptr = value; break; case oAddressFamily: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%s line %d: missing address family.", filename, linenum); intptr = &options->address_family; if (strcasecmp(arg, "inet") == 0) value = AF_INET; else if (strcasecmp(arg, "inet6") == 0) value = AF_INET6; else if (strcasecmp(arg, "any") == 0) value = AF_UNSPEC; else fatal("Unsupported AddressFamily \"%s\"", arg); if (*activep && *intptr == -1) *intptr = value; break; case oEnableSSHKeysign: intptr = &options->enable_ssh_keysign; goto parse_flag; case oIdentitiesOnly: intptr = &options->identities_only; goto parse_flag; case oServerAliveInterval: intptr = &options->server_alive_interval; goto parse_time; case oServerAliveCountMax: intptr = &options->server_alive_count_max; goto parse_int; case oSendEnv: while ((arg = strdelim(&s)) != NULL && *arg != '\0') { if (strchr(arg, '=') != NULL) fatal("%s line %d: Invalid environment name.", filename, linenum); if (!*activep) continue; if (options->num_send_env >= MAX_SEND_ENV) fatal("%s line %d: too many send env.", filename, linenum); options->send_env[options->num_send_env++] = xstrdup(arg); } break; case oControlPath: charptr = &options->control_path; goto parse_string; case oControlMaster: intptr = &options->control_master; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing ControlMaster argument.", filename, linenum); value = 0; /* To avoid compiler warning... */ if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) value = SSHCTL_MASTER_YES; else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) value = SSHCTL_MASTER_NO; else if (strcmp(arg, "auto") == 0) value = SSHCTL_MASTER_AUTO; else if (strcmp(arg, "ask") == 0) value = SSHCTL_MASTER_ASK; else if (strcmp(arg, "autoask") == 0) value = SSHCTL_MASTER_AUTO_ASK; else fatal("%.200s line %d: Bad ControlMaster argument.", filename, linenum); if (*activep && *intptr == -1) *intptr = value; break; case oControlPersist: /* no/false/yes/true, or a time spec */ intptr = &options->control_persist; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing ControlPersist" " argument.", filename, linenum); value = 0; value2 = 0; /* timeout */ if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) value = 0; else if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) value = 1; else if ((value2 = convtime(arg)) >= 0) value = 1; else fatal("%.200s line %d: Bad ControlPersist argument.", filename, linenum); if (*activep && *intptr == -1) { *intptr = value; options->control_persist_timeout = value2; } break; case oHashKnownHosts: intptr = &options->hash_known_hosts; goto parse_flag; case oTunnel: intptr = &options->tun_open; arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%s line %d: Missing yes/point-to-point/" "ethernet/no argument.", filename, linenum); value = 0; /* silence compiler */ if (strcasecmp(arg, "ethernet") == 0) value = SSH_TUNMODE_ETHERNET; else if (strcasecmp(arg, "point-to-point") == 0) value = SSH_TUNMODE_POINTOPOINT; else if (strcasecmp(arg, "yes") == 0) value = SSH_TUNMODE_DEFAULT; else if (strcasecmp(arg, "no") == 0) value = SSH_TUNMODE_NO; else fatal("%s line %d: Bad yes/point-to-point/ethernet/" "no argument: %s", filename, linenum, arg); if (*activep) *intptr = value; break; case oTunnelDevice: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%.200s line %d: Missing argument.", filename, linenum); value = a2tun(arg, &value2); if (value == SSH_TUNID_ERR) fatal("%.200s line %d: Bad tun device.", filename, linenum); if (*activep) { options->tun_local = value; options->tun_remote = value2; } break; case oLocalCommand: charptr = &options->local_command; goto parse_command; case oPermitLocalCommand: intptr = &options->permit_local_command; goto parse_flag; case oVisualHostKey: intptr = &options->visual_host_key; goto parse_flag; case oIPQoS: arg = strdelim(&s); if ((value = parse_ipqos(arg)) == -1) fatal("%s line %d: Bad IPQoS value: %s", filename, linenum, arg); arg = strdelim(&s); if (arg == NULL) value2 = value; else if ((value2 = parse_ipqos(arg)) == -1) fatal("%s line %d: Bad IPQoS value: %s", filename, linenum, arg); if (*activep) { options->ip_qos_interactive = value; options->ip_qos_bulk = value2; } break; case oUseRoaming: intptr = &options->use_roaming; goto parse_flag; case oRequestTTY: arg = strdelim(&s); if (!arg || *arg == '\0') fatal("%s line %d: missing argument.", filename, linenum); intptr = &options->request_tty; if (strcasecmp(arg, "yes") == 0) value = REQUEST_TTY_YES; else if (strcasecmp(arg, "no") == 0) value = REQUEST_TTY_NO; else if (strcasecmp(arg, "force") == 0) value = REQUEST_TTY_FORCE; else if (strcasecmp(arg, "auto") == 0) value = REQUEST_TTY_AUTO; else fatal("Unsupported RequestTTY \"%s\"", arg); if (*activep && *intptr == -1) *intptr = value; break; case oHPNDisabled: intptr = &options->hpn_disabled; goto parse_flag; case oHPNBufferSize: intptr = &options->hpn_buffer_size; goto parse_int; case oTcpRcvBufPoll: intptr = &options->tcp_rcv_buf_poll; goto parse_flag; case oTcpRcvBuf: intptr = &options->tcp_rcv_buf; goto parse_int; #ifdef NONE_CIPHER_ENABLED case oNoneEnabled: intptr = &options->none_enabled; goto parse_flag; /* * We check to see if the command comes from the command line or not. * If it does then enable it otherwise fail. NONE must never be a * default configuration. */ case oNoneSwitch: if (strcmp(filename,"command-line") == 0) { intptr = &options->none_switch; goto parse_flag; } else { debug("NoneSwitch directive found in %.200s.", filename); error("NoneSwitch is found in %.200s.\n" "You may only use this configuration option " "from the command line", filename); error("Continuing..."); return 0; } #endif case oVersionAddendum: if (s == NULL) fatal("%.200s line %d: Missing argument.", filename, linenum); len = strspn(s, WHITESPACE); if (*activep && options->version_addendum == NULL) { if (strcasecmp(s + len, "none") == 0) options->version_addendum = xstrdup(""); else if (strchr(s + len, '\r') != NULL) fatal("%.200s line %d: Invalid argument", filename, linenum); else options->version_addendum = xstrdup(s + len); } return 0; case oIgnoreUnknown: charptr = &options->ignored_unknown; goto parse_string; case oDeprecated: debug("%s line %d: Deprecated option \"%s\"", filename, linenum, keyword); return 0; case oUnsupported: error("%s line %d: Unsupported option \"%s\"", filename, linenum, keyword); return 0; default: fatal("process_config_line: Unimplemented opcode %d", opcode); } /* Check that there is no garbage at end of line. */ if ((arg = strdelim(&s)) != NULL && *arg != '\0') { fatal("%.200s line %d: garbage at end of line; \"%.200s\".", filename, linenum, arg); } return 0; }
struct sshauthopt * sshauthopt_parse(const char *opts, const char **errstrp) { char **oarray, *opt, *cp, *tmp, *host; int r; struct sshauthopt *ret = NULL; const char *errstr = "unknown error"; uint64_t valid_before; if (errstrp != NULL) *errstrp = NULL; if ((ret = sshauthopt_new_with_keys_defaults()) == NULL) goto alloc_fail; if (opts == NULL) return ret; while (*opts && *opts != ' ' && *opts != '\t') { /* flag options */ if ((r = opt_flag("restrict", 0, &opts)) != -1) { ret->restricted = 1; ret->permit_port_forwarding_flag = 0; ret->permit_agent_forwarding_flag = 0; ret->permit_x11_forwarding_flag = 0; ret->permit_pty_flag = 0; ret->permit_user_rc = 0; } else if ((r = opt_flag("cert-authority", 0, &opts)) != -1) { ret->cert_authority = r; } else if ((r = opt_flag("port-forwarding", 1, &opts)) != -1) { ret->permit_port_forwarding_flag = r == 1; } else if ((r = opt_flag("agent-forwarding", 1, &opts)) != -1) { ret->permit_agent_forwarding_flag = r == 1; } else if ((r = opt_flag("x11-forwarding", 1, &opts)) != -1) { ret->permit_x11_forwarding_flag = r == 1; } else if ((r = opt_flag("pty", 1, &opts)) != -1) { ret->permit_pty_flag = r == 1; } else if ((r = opt_flag("user-rc", 1, &opts)) != -1) { ret->permit_user_rc = r == 1; } else if (opt_match(&opts, "command")) { if (ret->force_command != NULL) { errstr = "multiple \"command\" clauses"; goto fail; } ret->force_command = opt_dequote(&opts, &errstr); if (ret->force_command == NULL) goto fail; } else if (opt_match(&opts, "principals")) { if (ret->cert_principals != NULL) { errstr = "multiple \"principals\" clauses"; goto fail; } ret->cert_principals = opt_dequote(&opts, &errstr); if (ret->cert_principals == NULL) goto fail; } else if (opt_match(&opts, "from")) { if (ret->required_from_host_keys != NULL) { errstr = "multiple \"from\" clauses"; goto fail; } ret->required_from_host_keys = opt_dequote(&opts, &errstr); if (ret->required_from_host_keys == NULL) goto fail; } else if (opt_match(&opts, "expiry-time")) { if ((opt = opt_dequote(&opts, &errstr)) == NULL) goto fail; if (parse_absolute_time(opt, &valid_before) != 0 || valid_before == 0) { free(opt); errstr = "invalid expires time"; goto fail; } free(opt); if (ret->valid_before == 0 || valid_before < ret->valid_before) ret->valid_before = valid_before; } else if (opt_match(&opts, "environment")) { if (ret->nenv > INT_MAX) { errstr = "too many environment strings"; goto fail; } if ((opt = opt_dequote(&opts, &errstr)) == NULL) goto fail; /* env name must be alphanumeric and followed by '=' */ if ((tmp = strchr(opt, '=')) == NULL) { free(opt); errstr = "invalid environment string"; goto fail; } for (cp = opt; cp < tmp; cp++) { if (!isalnum((u_char)*cp)) { free(opt); errstr = "invalid environment string"; goto fail; } } /* Append it. */ oarray = ret->env; if ((ret->env = recallocarray(ret->env, ret->nenv, ret->nenv + 1, sizeof(*ret->env))) == NULL) { free(opt); ret->env = oarray; /* put it back for cleanup */ goto alloc_fail; } ret->env[ret->nenv++] = opt; } else if (opt_match(&opts, "permitopen")) { if (ret->npermitopen > INT_MAX) { errstr = "too many permitopens"; goto fail; } if ((opt = opt_dequote(&opts, &errstr)) == NULL) goto fail; if ((tmp = strdup(opt)) == NULL) { free(opt); goto alloc_fail; } cp = tmp; /* validate syntax of permitopen before recording it. */ host = hpdelim(&cp); if (host == NULL || strlen(host) >= NI_MAXHOST) { free(tmp); free(opt); errstr = "invalid permitopen hostname"; goto fail; } /* * don't want to use permitopen_port to avoid * dependency on channels.[ch] here. */ if (cp == NULL || (strcmp(cp, "*") != 0 && a2port(cp) <= 0)) { free(tmp); free(opt); errstr = "invalid permitopen port"; goto fail; } /* XXX - add streamlocal support */ free(tmp); /* Record it */ oarray = ret->permitopen; if ((ret->permitopen = recallocarray(ret->permitopen, ret->npermitopen, ret->npermitopen + 1, sizeof(*ret->permitopen))) == NULL) { free(opt); ret->permitopen = oarray; goto alloc_fail; } ret->permitopen[ret->npermitopen++] = opt; } else if (opt_match(&opts, "tunnel")) { if ((opt = opt_dequote(&opts, &errstr)) == NULL) goto fail; ret->force_tun_device = a2tun(opt, NULL); free(opt); if (ret->force_tun_device == SSH_TUNID_ERR) { errstr = "invalid tun device"; goto fail; } } /* * Skip the comma, and move to the next option * (or break out if there are no more). */ if (*opts == '\0' || *opts == ' ' || *opts == '\t') break; /* End of options. */ /* Anything other than a comma is an unknown option */ if (*opts != ',') { errstr = "unknown key option"; goto fail; } opts++; if (*opts == '\0') { errstr = "unexpected end-of-options"; goto fail; } } /* success */ if (errstrp != NULL) *errstrp = NULL; return ret; alloc_fail: errstr = "memory allocation failed"; fail: sshauthopt_free(ret); if (errstrp != NULL) *errstrp = errstr; return NULL; }