servconf.c

OpenSSL Source code for SFTP, SSH, and many others

			    filename, linenum);
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing port number.",
			    filename, linenum);
		options->ports[options->num_ports++] = a2port(arg);
		if (options->ports[options->num_ports-1] == 0)
			fatal("%s line %d: Badly formatted port number.",
			    filename, linenum);
		break;

	case sServerKeyBits:
		intptr = &options->server_key_bits;
parse_int:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing integer value.",
			    filename, linenum);
		value = atoi(arg);
		if (*intptr == -1)
			*intptr = value;
		break;

	case sLoginGraceTime:
		intptr = &options->login_grace_time;
parse_time:
		arg = strdelim(&cp);
		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 (*intptr == -1)
			*intptr = value;
		break;

	case sKeyRegenerationTime:
		intptr = &options->key_regeneration_time;
		goto parse_time;

	case sListenAddress:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0)
			fatal("%s line %d: missing inet addr.",
			    filename, linenum);
		if (*arg == '[') {
			if ((p = strchr(arg, ']')) == NULL)
				fatal("%s line %d: bad ipv6 inet addr usage.",
				    filename, linenum);
			arg++;
			memmove(p, p+1, strlen(p+1)+1);
		} else if (((p = strchr(arg, ':')) == NULL) ||
			    (strchr(p+1, ':') != NULL)) {
			add_listen_addr(options, arg, 0);
			break;
		}
		if (*p == ':') {
			u_short port;

			p++;
			if (*p == '\0')
				fatal("%s line %d: bad inet addr:port usage.",
				    filename, linenum);
			else {
				*(p-1) = '\0';
				if ((port = a2port(p)) == 0)
					fatal("%s line %d: bad port number.",
					    filename, linenum);
				add_listen_addr(options, arg, port);
			}
		} else if (*p == '\0')
			add_listen_addr(options, arg, 0);
		else
			fatal("%s line %d: bad inet addr usage.",
			    filename, linenum);
		break;

	case sHostKeyFile:
		intptr = &options->num_host_key_files;
		if (*intptr >= MAX_HOSTKEYS)
			fatal("%s line %d: too many host keys specified (max %d).",
			    filename, linenum, MAX_HOSTKEYS);
		charptr = &options->host_key_files[*intptr];
parse_filename:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing file name.",
			    filename, linenum);
		if (*charptr == NULL) {
			*charptr = tilde_expand_filename(arg, getuid());
			/* increase optional counter */
			if (intptr != NULL)
				*intptr = *intptr + 1;
		}
		break;

	case sPidFile:
		charptr = &options->pid_file;
		goto parse_filename;

	case sPermitRootLogin:
		intptr = &options->permit_root_login;
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing yes/"
			    "without-password/forced-commands-only/no "
			    "argument.", filename, linenum);
		value = 0;	/* silence compiler */
		if (strcmp(arg, "without-password") == 0)
			value = PERMIT_NO_PASSWD;
		else if (strcmp(arg, "forced-commands-only") == 0)
			value = PERMIT_FORCED_ONLY;
		else if (strcmp(arg, "yes") == 0)
			value = PERMIT_YES;
		else if (strcmp(arg, "no") == 0)
			value = PERMIT_NO;
		else
			fatal("%s line %d: Bad yes/"
			    "without-password/forced-commands-only/no "
			    "argument: %s", filename, linenum, arg);
		if (*intptr == -1)
			*intptr = value;
		break;

	case sIgnoreRhosts:
		intptr = &options->ignore_rhosts;
parse_flag:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing yes/no argument.",
			    filename, linenum);
		value = 0;	/* silence compiler */
		if (strcmp(arg, "yes") == 0)
			value = 1;
		else if (strcmp(arg, "no") == 0)
			value = 0;
		else
			fatal("%s line %d: Bad yes/no argument: %s",
				filename, linenum, arg);
		if (*intptr == -1)
			*intptr = value;
		break;

	case sIgnoreUserKnownHosts:
		intptr = &options->ignore_user_known_hosts;
		goto parse_flag;

	case sRhostsAuthentication:
		intptr = &options->rhosts_authentication;
		goto parse_flag;

	case sRhostsRSAAuthentication:
		intptr = &options->rhosts_rsa_authentication;
		goto parse_flag;

	case sHostbasedAuthentication:
		intptr = &options->hostbased_authentication;
		goto parse_flag;

	case sHostbasedUsesNameFromPacketOnly:
		intptr = &options->hostbased_uses_name_from_packet_only;
		goto parse_flag;

	case sRSAAuthentication:
		intptr = &options->rsa_authentication;
		goto parse_flag;

	case sPubkeyAuthentication:
		intptr = &options->pubkey_authentication;
		goto parse_flag;
#if defined(KRB4) || defined(KRB5)
	case sKerberosAuthentication:
		intptr = &options->kerberos_authentication;
		goto parse_flag;

	case sKerberosOrLocalPasswd:
		intptr = &options->kerberos_or_local_passwd;
		goto parse_flag;

	case sKerberosTicketCleanup:
		intptr = &options->kerberos_ticket_cleanup;
		goto parse_flag;
#endif
#if defined(AFS) || defined(KRB5)
	case sKerberosTgtPassing:
		intptr = &options->kerberos_tgt_passing;
		goto parse_flag;
#endif
#ifdef AFS
	case sAFSTokenPassing:
		intptr = &options->afs_token_passing;
		goto parse_flag;
#endif

	case sPasswordAuthentication:
		intptr = &options->password_authentication;
		goto parse_flag;

	case sKbdInteractiveAuthentication:
		intptr = &options->kbd_interactive_authentication;
		goto parse_flag;

	case sChallengeResponseAuthentication:
		intptr = &options->challenge_response_authentication;
		goto parse_flag;

	case sPrintMotd:
		intptr = &options->print_motd;
		goto parse_flag;

	case sPrintLastLog:
		intptr = &options->print_lastlog;
		goto parse_flag;

	case sX11Forwarding:
		intptr = &options->x11_forwarding;
		goto parse_flag;

	case sX11DisplayOffset:
		intptr = &options->x11_display_offset;
		goto parse_int;

	case sX11UseLocalhost:
		intptr = &options->x11_use_localhost;
		goto parse_flag;

	case sXAuthLocation:
		charptr = &options->xauth_location;
		goto parse_filename;

	case sStrictModes:
		intptr = &options->strict_modes;
		goto parse_flag;

	case sKeepAlives:
		intptr = &options->keepalives;
		goto parse_flag;

	case sEmptyPasswd:
		intptr = &options->permit_empty_passwd;
		goto parse_flag;

	case sUseLogin:
		intptr = &options->use_login;
		goto parse_flag;

	case sCompression:
		intptr = &options->compression;
		goto parse_flag;

	case sGatewayPorts:
		intptr = &options->gateway_ports;
		goto parse_flag;

	case sVerifyReverseMapping:
		intptr = &options->verify_reverse_mapping;
		goto parse_flag;

	case sLogFacility:
		intptr = (int *) &options->log_facility;
		arg = strdelim(&cp);
		value = log_facility_number(arg);
		if (value == SYSLOG_FACILITY_NOT_SET)
			fatal("%.200s line %d: unsupported log facility '%s'",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*intptr == -1)
			*intptr = (SyslogFacility) value;
		break;

	case sLogLevel:
		intptr = (int *) &options->log_level;
		arg = strdelim(&cp);
		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 (*intptr == -1)
			*intptr = (LogLevel) value;
		break;

	case sAllowTcpForwarding:
		intptr = &options->allow_tcp_forwarding;
		goto parse_flag;

	case sUsePrivilegeSeparation:
		intptr = &use_privsep;
		goto parse_flag;

	case sAllowUsers:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_allow_users >= MAX_ALLOW_USERS)
				fatal("%s line %d: too many allow users.",
				    filename, linenum);
			options->allow_users[options->num_allow_users++] = xstrdup(arg);
		}
		break;

	case sDenyUsers:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_deny_users >= MAX_DENY_USERS)
				fatal( "%s line %d: too many deny users.",
				    filename, linenum);
			options->deny_users[options->num_deny_users++] = xstrdup(arg);
		}
		break;

	case sAllowGroups:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
				fatal("%s line %d: too many allow groups.",
				    filename, linenum);
			options->allow_groups[options->num_allow_groups++] = xstrdup(arg);
		}
		break;

	case sDenyGroups:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_deny_groups >= MAX_DENY_GROUPS)
				fatal("%s line %d: too many deny groups.",
				    filename, linenum);
			options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
		}
		break;

	case sCiphers:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing argument.", filename, linenum);
		if (!ciphers_valid(arg))
			fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (options->ciphers == NULL)
			options->ciphers = xstrdup(arg);
		break;

	case sMacs:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing argument.", filename, linenum);
		if (!mac_valid(arg))
			fatal("%s line %d: Bad SSH2 mac spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (options->macs == NULL)
			options->macs = xstrdup(arg);
		break;

	case sProtocol:
		intptr = &options->protocol;
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing argument.", filename, linenum);
		value = proto_spec(arg);
		if (value == SSH_PROTO_UNKNOWN)
			fatal("%s line %d: Bad protocol spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*intptr == SSH_PROTO_UNKNOWN)
			*intptr = value;
		break;

	case sSubsystem:
		if (options->num_subsystems >= MAX_SUBSYSTEMS) {
			fatal("%s line %d: too many subsystems defined.",
			    filename, linenum);
		}
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing subsystem name.",
			    filename, linenum);
		for (i = 0; i < options->num_subsystems; i++)
			if (strcmp(arg, options->subsystem_name[i]) == 0)
				fatal("%s line %d: Subsystem '%s' already defined.",
				    filename, linenum, arg);
		options->subsystem_name[options->num_subsystems] = xstrdup(arg);
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing subsystem command.",
			    filename, linenum);
		options->subsystem_command[options->num_subsystems] = xstrdup(arg);
		options->num_subsystems++;
		break;

	case sMaxStartups:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing MaxStartups spec.",
			    filename, linenum);
		if ((n = sscanf(arg, "%d:%d:%d",
		    &options->max_startups_begin,
		    &options->max_startups_rate,
		    &options->max_startups)) == 3) {
			if (options->max_startups_begin >
			    options->max_startups ||
			    options->max_startups_rate > 100 ||
			    options->max_startups_rate < 1)
				fatal("%s line %d: Illegal MaxStartups spec.",
				    filename, linenum);
		} else if (n != 1)
			fatal("%s line %d: Illegal MaxStartups spec.",
			    filename, linenum);
		else
			options->max_startups = options->max_startups_begin;
		break;

	case sBanner:
		charptr = &options->banner;
		goto parse_filename;
	/*
	 * These options can contain %X options expanded at
	 * connect time, so that you can specify paths like:
	 *
	 * AuthorizedKeysFile	/etc/ssh_keys/%u
	 */
	case sAuthorizedKeysFile:
	case sAuthorizedKeysFile2:
		charptr = (opcode == sAuthorizedKeysFile ) ?
		    &options->authorized_keys_file :
		    &options->authorized_keys_file2;
		goto parse_filename;

	case sClientAliveInterval:
		intptr = &options->client_alive_interval;
		goto parse_time;

	case sClientAliveCountMax:
		intptr = &options->client_alive_count_max;
		goto parse_int;

	case sDeprecated:
		log("%s line %d: Deprecated option %s",
		    filename, linenum, arg);
		while (arg)
		    arg = strdelim(&cp);
		break;

	default:
		fatal("%s line %d: Missing handler for opcode %s (%d)",
		    filename, linenum, arg, opcode);
	}
	if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
		fatal("%s line %d: garbage at end of line; \"%.200s\".",
		    filename, linenum, arg);
	return 0;
}

/* Reads the server configuration file. */

void
read_server_config(ServerOptions *options, const char *filename)
{
	FILE *f;
	char line[1024];
	int linenum;
	int bad_options = 0;

	f = fopen(filename, "r");
	if (!f) {
		perror(filename);
		exit(1);
	}
	linenum = 0;
	while (fgets(line, sizeof(line), f)) {
		/* Update line number counter. */
		linenum++;
		if (process_server_config_line(options, line, filename, linenum) != 0)
			bad_options++;
	}
	fclose(f);
	if (bad_options > 0)
		fatal("%s: terminating, %d bad configuration options",
		    filename, bad_options);
}