| /* $OpenBSD: readconf.c,v 1.203 2013/06/05 22:00:28 dtucker Exp $ */ |
| /* |
| * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| * All rights reserved |
| * Functions for reading the configuration files. |
| * |
| * 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". |
| */ |
| |
| #include "includes.h" |
| |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/socket.h> |
| |
| #include <netinet/in.h> |
| #include <netinet/in_systm.h> |
| #include <netinet/ip.h> |
| |
| #include <ctype.h> |
| #include <errno.h> |
| #include <netdb.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| #ifdef HAVE_UTIL_H |
| #include <util.h> |
| #endif |
| |
| #include "xmalloc.h" |
| #include "ssh.h" |
| #include "compat.h" |
| #include "cipher.h" |
| #include "pathnames.h" |
| #include "log.h" |
| #include "key.h" |
| #include "readconf.h" |
| #include "match.h" |
| #include "misc.h" |
| #include "buffer.h" |
| #include "kex.h" |
| #include "mac.h" |
| |
| /* Format of the configuration file: |
| |
| # Configuration data is parsed as follows: |
| # 1. command line options |
| # 2. user-specific file |
| # 3. system-wide file |
| # Any configuration value is only changed the first time it is set. |
| # Thus, host-specific definitions should be at the beginning of the |
| # configuration file, and defaults at the end. |
| |
| # Host-specific declarations. These may override anything above. A single |
| # host may match multiple declarations; these are processed in the order |
| # that they are given in. |
| |
| Host *.ngs.fi ngs.fi |
| User foo |
| |
| Host fake.com |
| HostName another.host.name.real.org |
| User blaah |
| Port 34289 |
| ForwardX11 no |
| ForwardAgent no |
| |
| Host books.com |
| RemoteForward 9999 shadows.cs.hut.fi:9999 |
| Cipher 3des |
| |
| Host fascist.blob.com |
| Port 23123 |
| User tylonen |
| PasswordAuthentication no |
| |
| Host puukko.hut.fi |
| User t35124p |
| ProxyCommand ssh-proxy %h %p |
| |
| Host *.fr |
| PublicKeyAuthentication no |
| |
| Host *.su |
| Cipher none |
| PasswordAuthentication no |
| |
| Host vpn.fake.com |
| Tunnel yes |
| TunnelDevice 3 |
| |
| # Defaults for various options |
| Host * |
| ForwardAgent no |
| ForwardX11 no |
| PasswordAuthentication yes |
| RSAAuthentication yes |
| RhostsRSAAuthentication yes |
| StrictHostKeyChecking yes |
| TcpKeepAlive no |
| IdentityFile ~/.ssh/identity |
| Port 22 |
| EscapeChar ~ |
| |
| */ |
| |
| /* Keyword tokens. */ |
| |
| typedef enum { |
| oBadOption, |
| oForwardAgent, oForwardX11, oForwardX11Trusted, oForwardX11Timeout, |
| oGatewayPorts, oExitOnForwardFailure, |
| oPasswordAuthentication, oRSAAuthentication, |
| oChallengeResponseAuthentication, oXAuthLocation, |
| oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, |
| oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, |
| oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, |
| oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, |
| oCompressionLevel, oTCPKeepAlive, oNumberOfPasswordPrompts, |
| oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, |
| oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, |
| oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, |
| oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication, |
| oHostKeyAlgorithms, oBindAddress, oPKCS11Provider, |
| oClearAllForwardings, oNoHostAuthenticationForLocalhost, |
| oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout, |
| oAddressFamily, oGssAuthentication, oGssDelegateCreds, |
| oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly, |
| oSendEnv, oControlPath, oControlMaster, oControlPersist, |
| oHashKnownHosts, |
| oTunnel, oTunnelDevice, oLocalCommand, oPermitLocalCommand, |
| oVisualHostKey, oUseRoaming, oZeroKnowledgePasswordAuthentication, |
| oKexAlgorithms, oIPQoS, oRequestTTY, oIgnoreUnknown, |
| oIgnoredUnknownOption, oDeprecated, oUnsupported |
| } OpCodes; |
| |
| /* Textual representations of the tokens. */ |
| |
| static struct { |
| const char *name; |
| OpCodes opcode; |
| } keywords[] = { |
| { "forwardagent", oForwardAgent }, |
| { "forwardx11", oForwardX11 }, |
| { "forwardx11trusted", oForwardX11Trusted }, |
| { "forwardx11timeout", oForwardX11Timeout }, |
| { "exitonforwardfailure", oExitOnForwardFailure }, |
| { "xauthlocation", oXAuthLocation }, |
| { "gatewayports", oGatewayPorts }, |
| { "useprivilegedport", oUsePrivilegedPort }, |
| { "rhostsauthentication", oDeprecated }, |
| { "passwordauthentication", oPasswordAuthentication }, |
| { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, |
| { "kbdinteractivedevices", oKbdInteractiveDevices }, |
| { "rsaauthentication", oRSAAuthentication }, |
| { "pubkeyauthentication", oPubkeyAuthentication }, |
| { "dsaauthentication", oPubkeyAuthentication }, /* alias */ |
| { "rhostsrsaauthentication", oRhostsRSAAuthentication }, |
| { "hostbasedauthentication", oHostbasedAuthentication }, |
| { "challengeresponseauthentication", oChallengeResponseAuthentication }, |
| { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ |
| { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ |
| { "kerberosauthentication", oUnsupported }, |
| { "kerberostgtpassing", oUnsupported }, |
| { "afstokenpassing", oUnsupported }, |
| #if defined(GSSAPI) |
| { "gssapiauthentication", oGssAuthentication }, |
| { "gssapidelegatecredentials", oGssDelegateCreds }, |
| #else |
| { "gssapiauthentication", oUnsupported }, |
| { "gssapidelegatecredentials", oUnsupported }, |
| #endif |
| { "fallbacktorsh", oDeprecated }, |
| { "usersh", oDeprecated }, |
| { "identityfile", oIdentityFile }, |
| { "identityfile2", oIdentityFile }, /* obsolete */ |
| { "identitiesonly", oIdentitiesOnly }, |
| { "hostname", oHostName }, |
| { "hostkeyalias", oHostKeyAlias }, |
| { "proxycommand", oProxyCommand }, |
| { "port", oPort }, |
| { "cipher", oCipher }, |
| { "ciphers", oCiphers }, |
| { "macs", oMacs }, |
| { "protocol", oProtocol }, |
| { "remoteforward", oRemoteForward }, |
| { "localforward", oLocalForward }, |
| { "user", oUser }, |
| { "host", oHost }, |
| { "escapechar", oEscapeChar }, |
| { "globalknownhostsfile", oGlobalKnownHostsFile }, |
| { "globalknownhostsfile2", oDeprecated }, |
| { "userknownhostsfile", oUserKnownHostsFile }, |
| { "userknownhostsfile2", oDeprecated }, |
| { "connectionattempts", oConnectionAttempts }, |
| { "batchmode", oBatchMode }, |
| { "checkhostip", oCheckHostIP }, |
| { "stricthostkeychecking", oStrictHostKeyChecking }, |
| { "compression", oCompression }, |
| { "compressionlevel", oCompressionLevel }, |
| { "tcpkeepalive", oTCPKeepAlive }, |
| { "keepalive", oTCPKeepAlive }, /* obsolete */ |
| { "numberofpasswordprompts", oNumberOfPasswordPrompts }, |
| { "loglevel", oLogLevel }, |
| { "dynamicforward", oDynamicForward }, |
| { "preferredauthentications", oPreferredAuthentications }, |
| { "hostkeyalgorithms", oHostKeyAlgorithms }, |
| { "bindaddress", oBindAddress }, |
| #ifdef ENABLE_PKCS11 |
| { "smartcarddevice", oPKCS11Provider }, |
| { "pkcs11provider", oPKCS11Provider }, |
| #else |
| { "smartcarddevice", oUnsupported }, |
| { "pkcs11provider", oUnsupported }, |
| #endif |
| { "clearallforwardings", oClearAllForwardings }, |
| { "enablesshkeysign", oEnableSSHKeysign }, |
| { "verifyhostkeydns", oVerifyHostKeyDNS }, |
| { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost }, |
| { "rekeylimit", oRekeyLimit }, |
| { "connecttimeout", oConnectTimeout }, |
| { "addressfamily", oAddressFamily }, |
| { "serveraliveinterval", oServerAliveInterval }, |
| { "serveralivecountmax", oServerAliveCountMax }, |
| { "sendenv", oSendEnv }, |
| { "controlpath", oControlPath }, |
| { "controlmaster", oControlMaster }, |
| { "controlpersist", oControlPersist }, |
| { "hashknownhosts", oHashKnownHosts }, |
| { "tunnel", oTunnel }, |
| { "tunneldevice", oTunnelDevice }, |
| { "localcommand", oLocalCommand }, |
| { "permitlocalcommand", oPermitLocalCommand }, |
| { "visualhostkey", oVisualHostKey }, |
| { "useroaming", oUseRoaming }, |
| #ifdef JPAKE |
| { "zeroknowledgepasswordauthentication", |
| oZeroKnowledgePasswordAuthentication }, |
| #else |
| { "zeroknowledgepasswordauthentication", oUnsupported }, |
| #endif |
| { "kexalgorithms", oKexAlgorithms }, |
| { "ipqos", oIPQoS }, |
| { "requesttty", oRequestTTY }, |
| { "ignoreunknown", oIgnoreUnknown }, |
| |
| { NULL, oBadOption } |
| }; |
| |
| /* |
| * Adds a local TCP/IP port forward to options. Never returns if there is an |
| * error. |
| */ |
| |
| void |
| add_local_forward(Options *options, const Forward *newfwd) |
| { |
| Forward *fwd; |
| #ifndef NO_IPPORT_RESERVED_CONCEPT |
| extern uid_t original_real_uid; |
| if (newfwd->listen_port < IPPORT_RESERVED && original_real_uid != 0) |
| fatal("Privileged ports can only be forwarded by root."); |
| #endif |
| options->local_forwards = xrealloc(options->local_forwards, |
| options->num_local_forwards + 1, |
| sizeof(*options->local_forwards)); |
| fwd = &options->local_forwards[options->num_local_forwards++]; |
| |
| fwd->listen_host = newfwd->listen_host; |
| fwd->listen_port = newfwd->listen_port; |
| fwd->connect_host = newfwd->connect_host; |
| fwd->connect_port = newfwd->connect_port; |
| } |
| |
| /* |
| * Adds a remote TCP/IP port forward to options. Never returns if there is |
| * an error. |
| */ |
| |
| void |
| add_remote_forward(Options *options, const Forward *newfwd) |
| { |
| Forward *fwd; |
| |
| options->remote_forwards = xrealloc(options->remote_forwards, |
| options->num_remote_forwards + 1, |
| sizeof(*options->remote_forwards)); |
| fwd = &options->remote_forwards[options->num_remote_forwards++]; |
| |
| fwd->listen_host = newfwd->listen_host; |
| fwd->listen_port = newfwd->listen_port; |
| fwd->connect_host = newfwd->connect_host; |
| fwd->connect_port = newfwd->connect_port; |
| fwd->handle = newfwd->handle; |
| fwd->allocated_port = 0; |
| } |
| |
| static void |
| clear_forwardings(Options *options) |
| { |
| int i; |
| |
| for (i = 0; i < options->num_local_forwards; i++) { |
| free(options->local_forwards[i].listen_host); |
| free(options->local_forwards[i].connect_host); |
| } |
| if (options->num_local_forwards > 0) { |
| free(options->local_forwards); |
| options->local_forwards = NULL; |
| } |
| options->num_local_forwards = 0; |
| for (i = 0; i < options->num_remote_forwards; i++) { |
| free(options->remote_forwards[i].listen_host); |
| free(options->remote_forwards[i].connect_host); |
| } |
| if (options->num_remote_forwards > 0) { |
| free(options->remote_forwards); |
| options->remote_forwards = NULL; |
| } |
| options->num_remote_forwards = 0; |
| options->tun_open = SSH_TUNMODE_NO; |
| } |
| |
| void |
| add_identity_file(Options *options, const char *dir, const char *filename, |
| int userprovided) |
| { |
| char *path; |
| |
| if (options->num_identity_files >= SSH_MAX_IDENTITY_FILES) |
| fatal("Too many identity files specified (max %d)", |
| SSH_MAX_IDENTITY_FILES); |
| |
| if (dir == NULL) /* no dir, filename is absolute */ |
| path = xstrdup(filename); |
| else |
| (void)xasprintf(&path, "%.100s%.100s", dir, filename); |
| |
| options->identity_file_userprovided[options->num_identity_files] = |
| userprovided; |
| options->identity_files[options->num_identity_files++] = path; |
| } |
| |
| /* |
| * Returns the number of the token pointed to by cp or oBadOption. |
| */ |
| |
| static OpCodes |
| parse_token(const char *cp, const char *filename, int linenum, |
| const char *ignored_unknown) |
| { |
| int i; |
| |
| for (i = 0; keywords[i].name; i++) |
| if (strcmp(cp, keywords[i].name) == 0) |
| return keywords[i].opcode; |
| if (ignored_unknown != NULL && match_pattern_list(cp, ignored_unknown, |
| strlen(ignored_unknown), 1) == 1) |
| return oIgnoredUnknownOption; |
| error("%s: line %d: Bad configuration option: %s", |
| filename, linenum, cp); |
| return oBadOption; |
| } |
| |
| /* |
| * Processes a single option line as used in the configuration files. This |
| * only sets those values that have not already been set. |
| */ |
| #define WHITESPACE " \t\r\n" |
| |
| 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); |
| } |
| free(fwd.connect_host); |
| free(fwd.listen_host); |
| 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 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; |
| } |
| |
| |
| /* |
| * Reads the config file and modifies the options accordingly. Options |
| * should already be initialized before this call. This never returns if |
| * there is an error. If the file does not exist, this returns 0. |
| */ |
| |
| int |
| read_config_file(const char *filename, const char *host, Options *options, |
| int flags) |
| { |
| FILE *f; |
| char line[1024]; |
| int active, linenum; |
| int bad_options = 0; |
| |
| if ((f = fopen(filename, "r")) == NULL) |
| return 0; |
| |
| if (flags & SSHCONF_CHECKPERM) { |
| struct stat sb; |
| |
| if (fstat(fileno(f), &sb) == -1) |
| fatal("fstat %s: %s", filename, strerror(errno)); |
| if (((sb.st_uid != 0 && sb.st_uid != getuid()) || |
| (sb.st_mode & 022) != 0)) |
| fatal("Bad owner or permissions on %s", filename); |
| } |
| |
| debug("Reading configuration data %.200s", filename); |
| |
| /* |
| * Mark that we are now processing the options. This flag is turned |
| * on/off by Host specifications. |
| */ |
| active = 1; |
| linenum = 0; |
| while (fgets(line, sizeof(line), f)) { |
| /* Update line number counter. */ |
| linenum++; |
| if (process_config_line(options, host, line, filename, linenum, |
| &active, flags & SSHCONF_USERCONF) != 0) |
| bad_options++; |
| } |
| fclose(f); |
| if (bad_options > 0) |
| fatal("%s: terminating, %d bad configuration options", |
| filename, bad_options); |
| return 1; |
| } |
| |
| /* |
| * Initializes options to special values that indicate that they have not yet |
| * been set. Read_config_file will only set options with this value. Options |
| * are processed in the following order: command line, user config file, |
| * system config file. Last, fill_default_options is called. |
| */ |
| |
| void |
| initialize_options(Options * options) |
| { |
| memset(options, 'X', sizeof(*options)); |
| options->forward_agent = -1; |
| options->forward_x11 = -1; |
| options->forward_x11_trusted = -1; |
| options->forward_x11_timeout = -1; |
| options->exit_on_forward_failure = -1; |
| options->xauth_location = NULL; |
| options->gateway_ports = -1; |
| options->use_privileged_port = -1; |
| options->rsa_authentication = -1; |
| options->pubkey_authentication = -1; |
| options->challenge_response_authentication = -1; |
| options->gss_authentication = -1; |
| options->gss_deleg_creds = -1; |
| options->password_authentication = -1; |
| options->kbd_interactive_authentication = -1; |
| options->kbd_interactive_devices = NULL; |
| options->rhosts_rsa_authentication = -1; |
| options->hostbased_authentication = -1; |
| options->batch_mode = -1; |
| options->check_host_ip = -1; |
| options->strict_host_key_checking = -1; |
| options->compression = -1; |
| options->tcp_keep_alive = -1; |
| options->compression_level = -1; |
| options->port = -1; |
| options->address_family = -1; |
| options->connection_attempts = -1; |
| options->connection_timeout = -1; |
| options->number_of_password_prompts = -1; |
| options->cipher = -1; |
| options->ciphers = NULL; |
| options->macs = NULL; |
| options->kex_algorithms = NULL; |
| options->hostkeyalgorithms = NULL; |
| options->protocol = SSH_PROTO_UNKNOWN; |
| options->num_identity_files = 0; |
| options->hostname = NULL; |
| options->host_key_alias = NULL; |
| options->proxy_command = NULL; |
| options->user = NULL; |
| options->escape_char = -1; |
| options->num_system_hostfiles = 0; |
| options->num_user_hostfiles = 0; |
| options->local_forwards = NULL; |
| options->num_local_forwards = 0; |
| options->remote_forwards = NULL; |
| options->num_remote_forwards = 0; |
| options->clear_forwardings = -1; |
| options->log_level = SYSLOG_LEVEL_NOT_SET; |
| options->preferred_authentications = NULL; |
| options->bind_address = NULL; |
| options->pkcs11_provider = NULL; |
| options->enable_ssh_keysign = - 1; |
| options->no_host_authentication_for_localhost = - 1; |
| options->identities_only = - 1; |
| options->rekey_limit = - 1; |
| options->rekey_interval = -1; |
| options->verify_host_key_dns = -1; |
| options->server_alive_interval = -1; |
| options->server_alive_count_max = -1; |
| options->num_send_env = 0; |
| options->control_path = NULL; |
| options->control_master = -1; |
| options->control_persist = -1; |
| options->control_persist_timeout = 0; |
| options->hash_known_hosts = -1; |
| options->tun_open = -1; |
| options->tun_local = -1; |
| options->tun_remote = -1; |
| options->local_command = NULL; |
| options->permit_local_command = -1; |
| options->use_roaming = -1; |
| options->visual_host_key = -1; |
| options->zero_knowledge_password_authentication = -1; |
| options->ip_qos_interactive = -1; |
| options->ip_qos_bulk = -1; |
| options->request_tty = -1; |
| options->ignored_unknown = NULL; |
| } |
| |
| /* |
| * Called after processing other sources of option data, this fills those |
| * options for which no value has been specified with their default values. |
| */ |
| |
| void |
| fill_default_options(Options * options) |
| { |
| if (options->forward_agent == -1) |
| options->forward_agent = 0; |
| if (options->forward_x11 == -1) |
| options->forward_x11 = 0; |
| if (options->forward_x11_trusted == -1) |
| options->forward_x11_trusted = 0; |
| if (options->forward_x11_timeout == -1) |
| options->forward_x11_timeout = 1200; |
| if (options->exit_on_forward_failure == -1) |
| options->exit_on_forward_failure = 0; |
| if (options->xauth_location == NULL) |
| options->xauth_location = _PATH_XAUTH; |
| if (options->gateway_ports == -1) |
| options->gateway_ports = 0; |
| if (options->use_privileged_port == -1) |
| options->use_privileged_port = 0; |
| if (options->rsa_authentication == -1) |
| options->rsa_authentication = 1; |
| if (options->pubkey_authentication == -1) |
| options->pubkey_authentication = 1; |
| if (options->challenge_response_authentication == -1) |
| options->challenge_response_authentication = 1; |
| if (options->gss_authentication == -1) |
| options->gss_authentication = 0; |
| if (options->gss_deleg_creds == -1) |
| options->gss_deleg_creds = 0; |
| if (options->password_authentication == -1) |
| options->password_authentication = 1; |
| if (options->kbd_interactive_authentication == -1) |
| options->kbd_interactive_authentication = 1; |
| if (options->rhosts_rsa_authentication == -1) |
| options->rhosts_rsa_authentication = 0; |
| if (options->hostbased_authentication == -1) |
| options->hostbased_authentication = 0; |
| if (options->batch_mode == -1) |
| options->batch_mode = 0; |
| if (options->check_host_ip == -1) |
| options->check_host_ip = 1; |
| if (options->strict_host_key_checking == -1) |
| options->strict_host_key_checking = 2; /* 2 is default */ |
| if (options->compression == -1) |
| options->compression = 0; |
| if (options->tcp_keep_alive == -1) |
| options->tcp_keep_alive = 1; |
| if (options->compression_level == -1) |
| options->compression_level = 6; |
| if (options->port == -1) |
| options->port = 0; /* Filled in ssh_connect. */ |
| if (options->address_family == -1) |
| options->address_family = AF_UNSPEC; |
| if (options->connection_attempts == -1) |
| options->connection_attempts = 1; |
| if (options->number_of_password_prompts == -1) |
| options->number_of_password_prompts = 3; |
| /* Selected in ssh_login(). */ |
| if (options->cipher == -1) |
| options->cipher = SSH_CIPHER_NOT_SET; |
| /* options->ciphers, default set in myproposals.h */ |
| /* options->macs, default set in myproposals.h */ |
| /* options->kex_algorithms, default set in myproposals.h */ |
| /* options->hostkeyalgorithms, default set in myproposals.h */ |
| if (options->protocol == SSH_PROTO_UNKNOWN) |
| options->protocol = SSH_PROTO_2; |
| if (options->num_identity_files == 0) { |
| if (options->protocol & SSH_PROTO_1) { |
| add_identity_file(options, "~/", |
| _PATH_SSH_CLIENT_IDENTITY, 0); |
| } |
| if (options->protocol & SSH_PROTO_2) { |
| add_identity_file(options, "~/", |
| _PATH_SSH_CLIENT_ID_RSA, 0); |
| add_identity_file(options, "~/", |
| _PATH_SSH_CLIENT_ID_DSA, 0); |
| #ifdef OPENSSL_HAS_ECC |
| add_identity_file(options, "~/", |
| _PATH_SSH_CLIENT_ID_ECDSA, 0); |
| #endif |
| } |
| } |
| if (options->escape_char == -1) |
| options->escape_char = '~'; |
| if (options->num_system_hostfiles == 0) { |
| options->system_hostfiles[options->num_system_hostfiles++] = |
| xstrdup(_PATH_SSH_SYSTEM_HOSTFILE); |
| options->system_hostfiles[options->num_system_hostfiles++] = |
| xstrdup(_PATH_SSH_SYSTEM_HOSTFILE2); |
| } |
| if (options->num_user_hostfiles == 0) { |
| options->user_hostfiles[options->num_user_hostfiles++] = |
| xstrdup(_PATH_SSH_USER_HOSTFILE); |
| options->user_hostfiles[options->num_user_hostfiles++] = |
| xstrdup(_PATH_SSH_USER_HOSTFILE2); |
| } |
| if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
| options->log_level = SYSLOG_LEVEL_INFO; |
| if (options->clear_forwardings == 1) |
| clear_forwardings(options); |
| if (options->no_host_authentication_for_localhost == - 1) |
| options->no_host_authentication_for_localhost = 0; |
| if (options->identities_only == -1) |
| options->identities_only = 0; |
| if (options->enable_ssh_keysign == -1) |
| options->enable_ssh_keysign = 0; |
| if (options->rekey_limit == -1) |
| options->rekey_limit = 0; |
| if (options->rekey_interval == -1) |
| options->rekey_interval = 0; |
| if (options->verify_host_key_dns == -1) |
| options->verify_host_key_dns = 0; |
| if (options->server_alive_interval == -1) |
| options->server_alive_interval = 0; |
| if (options->server_alive_count_max == -1) |
| options->server_alive_count_max = 3; |
| if (options->control_master == -1) |
| options->control_master = 0; |
| if (options->control_persist == -1) { |
| options->control_persist = 0; |
| options->control_persist_timeout = 0; |
| } |
| if (options->hash_known_hosts == -1) |
| options->hash_known_hosts = 0; |
| if (options->tun_open == -1) |
| options->tun_open = SSH_TUNMODE_NO; |
| if (options->tun_local == -1) |
| options->tun_local = SSH_TUNID_ANY; |
| if (options->tun_remote == -1) |
| options->tun_remote = SSH_TUNID_ANY; |
| if (options->permit_local_command == -1) |
| options->permit_local_command = 0; |
| if (options->use_roaming == -1) |
| options->use_roaming = 1; |
| if (options->visual_host_key == -1) |
| options->visual_host_key = 0; |
| if (options->zero_knowledge_password_authentication == -1) |
| options->zero_knowledge_password_authentication = 0; |
| if (options->ip_qos_interactive == -1) |
| options->ip_qos_interactive = IPTOS_LOWDELAY; |
| if (options->ip_qos_bulk == -1) |
| options->ip_qos_bulk = IPTOS_THROUGHPUT; |
| if (options->request_tty == -1) |
| options->request_tty = REQUEST_TTY_AUTO; |
| /* options->local_command should not be set by default */ |
| /* options->proxy_command should not be set by default */ |
| /* options->user will be set in the main program if appropriate */ |
| /* options->hostname will be set in the main program if appropriate */ |
| /* options->host_key_alias should not be set by default */ |
| /* options->preferred_authentications will be set in ssh */ |
| } |
| |
| /* |
| * parse_forward |
| * parses a string containing a port forwarding specification of the form: |
| * dynamicfwd == 0 |
| * [listenhost:]listenport:connecthost:connectport |
| * dynamicfwd == 1 |
| * [listenhost:]listenport |
| * returns number of arguments parsed or zero on error |
| */ |
| int |
| parse_forward(Forward *fwd, const char *fwdspec, int dynamicfwd, int remotefwd) |
| { |
| int i; |
| char *p, *cp, *fwdarg[4]; |
| |
| memset(fwd, '\0', sizeof(*fwd)); |
| |
| cp = p = xstrdup(fwdspec); |
| |
| /* skip leading spaces */ |
| while (isspace(*cp)) |
| cp++; |
| |
| for (i = 0; i < 4; ++i) |
| if ((fwdarg[i] = hpdelim(&cp)) == NULL) |
| break; |
| |
| /* Check for trailing garbage */ |
| if (cp != NULL) |
| i = 0; /* failure */ |
| |
| switch (i) { |
| case 1: |
| fwd->listen_host = NULL; |
| fwd->listen_port = a2port(fwdarg[0]); |
| fwd->connect_host = xstrdup("socks"); |
| break; |
| |
| case 2: |
| fwd->listen_host = xstrdup(cleanhostname(fwdarg[0])); |
| fwd->listen_port = a2port(fwdarg[1]); |
| fwd->connect_host = xstrdup("socks"); |
| break; |
| |
| case 3: |
| fwd->listen_host = NULL; |
| fwd->listen_port = a2port(fwdarg[0]); |
| fwd->connect_host = xstrdup(cleanhostname(fwdarg[1])); |
| fwd->connect_port = a2port(fwdarg[2]); |
| break; |
| |
| case 4: |
| fwd->listen_host = xstrdup(cleanhostname(fwdarg[0])); |
| fwd->listen_port = a2port(fwdarg[1]); |
| fwd->connect_host = xstrdup(cleanhostname(fwdarg[2])); |
| fwd->connect_port = a2port(fwdarg[3]); |
| break; |
| default: |
| i = 0; /* failure */ |
| } |
| |
| free(p); |
| |
| if (dynamicfwd) { |
| if (!(i == 1 || i == 2)) |
| goto fail_free; |
| } else { |
| if (!(i == 3 || i == 4)) |
| goto fail_free; |
| if (fwd->connect_port <= 0) |
| goto fail_free; |
| } |
| |
| if (fwd->listen_port < 0 || (!remotefwd && fwd->listen_port == 0)) |
| goto fail_free; |
| |
| if (fwd->connect_host != NULL && |
| strlen(fwd->connect_host) >= NI_MAXHOST) |
| goto fail_free; |
| if (fwd->listen_host != NULL && |
| strlen(fwd->listen_host) >= NI_MAXHOST) |
| goto fail_free; |
| |
| |
| return (i); |
| |
| fail_free: |
| free(fwd->connect_host); |
| fwd->connect_host = NULL; |
| free(fwd->listen_host); |
| fwd->listen_host = NULL; |
| return (0); |
| } |