diff options
author | des <des@FreeBSD.org> | 2008-07-22 18:58:19 +0000 |
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committer | des <des@FreeBSD.org> | 2008-07-22 18:58:19 +0000 |
commit | 666aa9cc1660793c97ef29a6cb66dfbb894dde8f (patch) | |
tree | 209e642fbe2a816041f67bc27c9800879f5541bc /crypto/openssh/readconf.c | |
parent | 624d93001f28e236c027516d88282351eb7bffbe (diff) | |
download | FreeBSD-src-666aa9cc1660793c97ef29a6cb66dfbb894dde8f.zip FreeBSD-src-666aa9cc1660793c97ef29a6cb66dfbb894dde8f.tar.gz |
Revert part of 180714 - the intent was to flatten dist, not to nuke it.
Diffstat (limited to 'crypto/openssh/readconf.c')
-rw-r--r-- | crypto/openssh/readconf.c | 1273 |
1 files changed, 1273 insertions, 0 deletions
diff --git a/crypto/openssh/readconf.c b/crypto/openssh/readconf.c new file mode 100644 index 0000000..4cacf60 --- /dev/null +++ b/crypto/openssh/readconf.c @@ -0,0 +1,1273 @@ +/* $OpenBSD: readconf.c,v 1.159 2006/08/03 03:34:42 deraadt 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 <ctype.h> +#include <errno.h> +#include <netdb.h> +#include <signal.h> +#include <stdarg.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#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, 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, oSmartcardDevice, + oClearAllForwardings, oNoHostAuthenticationForLocalhost, + oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout, + oAddressFamily, oGssAuthentication, oGssDelegateCreds, + oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly, + oSendEnv, oControlPath, oControlMaster, oHashKnownHosts, + oTunnel, oTunnelDevice, oLocalCommand, oPermitLocalCommand, + oDeprecated, oUnsupported +} OpCodes; + +/* Textual representations of the tokens. */ + +static struct { + const char *name; + OpCodes opcode; +} keywords[] = { + { "forwardagent", oForwardAgent }, + { "forwardx11", oForwardX11 }, + { "forwardx11trusted", oForwardX11Trusted }, + { "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 }, /* alias */ + { "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 }, + { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */ + { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, + { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ + { "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 SMARTCARD + { "smartcarddevice", oSmartcardDevice }, +#else + { "smartcarddevice", 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 }, + { "hashknownhosts", oHashKnownHosts }, + { "tunnel", oTunnel }, + { "tunneldevice", oTunnelDevice }, + { "localcommand", oLocalCommand }, + { "permitlocalcommand", oPermitLocalCommand }, + { 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 + if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) + fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); + fwd = &options->local_forwards[options->num_local_forwards++]; + + fwd->listen_host = (newfwd->listen_host == NULL) ? + NULL : xstrdup(newfwd->listen_host); + fwd->listen_port = newfwd->listen_port; + fwd->connect_host = xstrdup(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; + if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) + fatal("Too many remote forwards (max %d).", + SSH_MAX_FORWARDS_PER_DIRECTION); + fwd = &options->remote_forwards[options->num_remote_forwards++]; + + fwd->listen_host = (newfwd->listen_host == NULL) ? + NULL : xstrdup(newfwd->listen_host); + fwd->listen_port = newfwd->listen_port; + fwd->connect_host = xstrdup(newfwd->connect_host); + fwd->connect_port = newfwd->connect_port; +} + +static void +clear_forwardings(Options *options) +{ + int i; + + for (i = 0; i < options->num_local_forwards; i++) { + if (options->local_forwards[i].listen_host != NULL) + xfree(options->local_forwards[i].listen_host); + xfree(options->local_forwards[i].connect_host); + } + options->num_local_forwards = 0; + for (i = 0; i < options->num_remote_forwards; i++) { + if (options->remote_forwards[i].listen_host != NULL) + xfree(options->remote_forwards[i].listen_host); + xfree(options->remote_forwards[i].connect_host); + } + options->num_remote_forwards = 0; + options->tun_open = SSH_TUNMODE_NO; +} + +/* + * Returns the number of the token pointed to by cp or oBadOption. + */ + +static OpCodes +parse_token(const char *cp, const char *filename, int linenum) +{ + u_int i; + + for (i = 0; keywords[i].name; i++) + if (strcasecmp(cp, keywords[i].name) == 0) + return keywords[i].opcode; + + 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) +{ + char *s, **charptr, *endofnumber, *keyword, *arg, *arg2, fwdarg[256]; + int opcode, *intptr, value, value2, scale; + 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 (*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 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 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: + intptr = &options->rekey_limit; + 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 > INT_MAX) + fatal("%.200s line %d: RekeyLimit too large", + filename, linenum); + if (val64 < 16) + fatal("%.200s line %d: RekeyLimit too small", + filename, linenum); + if (*activep && *intptr == -1) + *intptr = (int)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 oSmartcardDevice: + charptr = &options->smartcard_device; + 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 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: + intptr = (int *) &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 && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET) + *intptr = (LogLevel) value; + break; + + case oLocalForward: + case oRemoteForward: + arg = strdelim(&s); + if (arg == NULL || *arg == '\0') + fatal("%.200s line %d: Missing port argument.", + filename, linenum); + 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); + + if (parse_forward(&fwd, fwdarg) == 0) + fatal("%.200s line %d: Bad forwarding specification.", + filename, linenum); + + if (*activep) { + if (opcode == oLocalForward) + add_local_forward(options, &fwd); + else if (opcode == oRemoteForward) + add_remote_forward(options, &fwd); + } + break; + + case oDynamicForward: + arg = strdelim(&s); + if (!arg || *arg == '\0') + fatal("%.200s line %d: Missing port argument.", + filename, linenum); + memset(&fwd, '\0', sizeof(fwd)); + fwd.connect_host = "socks"; + fwd.listen_host = hpdelim(&arg); + if (fwd.listen_host == NULL || + strlen(fwd.listen_host) >= NI_MAXHOST) + fatal("%.200s line %d: Bad forwarding specification.", + filename, linenum); + if (arg) { + fwd.listen_port = a2port(arg); + fwd.listen_host = cleanhostname(fwd.listen_host); + } else { + fwd.listen_port = a2port(fwd.listen_host); + fwd.listen_host = NULL; + } + if (fwd.listen_port == 0) + fatal("%.200s line %d: Badly formatted port number.", + filename, linenum); + if (*activep) + add_local_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 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 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 checkperm) +{ + FILE *f; + char line[1024]; + int active, linenum; + int bad_options = 0; + + /* Open the file. */ + if ((f = fopen(filename, "r")) == NULL) + return 0; + + if (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) != 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->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->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->system_hostfile = NULL; + options->user_hostfile = NULL; + options->system_hostfile2 = NULL; + options->user_hostfile2 = NULL; + options->num_local_forwards = 0; + 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->smartcard_device = NULL; + options->enable_ssh_keysign = - 1; + options->no_host_authentication_for_localhost = - 1; + options->identities_only = - 1; + options->rekey_limit = - 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->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; +} + +/* + * 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) +{ + int len; + + 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->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->hostkeyalgorithms, default set in myproposals.h */ + if (options->protocol == SSH_PROTO_UNKNOWN) + options->protocol = SSH_PROTO_1|SSH_PROTO_2; + if (options->num_identity_files == 0) { + if (options->protocol & SSH_PROTO_1) { + len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; + options->identity_files[options->num_identity_files] = + xmalloc(len); + snprintf(options->identity_files[options->num_identity_files++], + len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); + } + if (options->protocol & SSH_PROTO_2) { + len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; + options->identity_files[options->num_identity_files] = + xmalloc(len); + snprintf(options->identity_files[options->num_identity_files++], + len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); + + len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; + options->identity_files[options->num_identity_files] = + xmalloc(len); + snprintf(options->identity_files[options->num_identity_files++], + len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); + } + } + if (options->escape_char == -1) + options->escape_char = '~'; + if (options->system_hostfile == NULL) + options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; + if (options->user_hostfile == NULL) + options->user_hostfile = _PATH_SSH_USER_HOSTFILE; + if (options->system_hostfile2 == NULL) + options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; + if (options->user_hostfile2 == NULL) + options->user_hostfile2 = _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->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->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; + /* 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: + * [listenhost:]listenport:connecthost:connectport + * returns number of arguments parsed or zero on error + */ +int +parse_forward(Forward *fwd, const char *fwdspec) +{ + int i; + char *p, *cp, *fwdarg[4]; + + memset(fwd, '\0', sizeof(*fwd)); + + cp = p = xstrdup(fwdspec); + + /* skip leading spaces */ + while (*cp && isspace(*cp)) + cp++; + + for (i = 0; i < 4; ++i) + if ((fwdarg[i] = hpdelim(&cp)) == NULL) + break; + + /* Check for trailing garbage in 4-arg case*/ + if (cp != NULL) + i = 0; /* failure */ + + switch (i) { + 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 */ + } + + xfree(p); + + if (fwd->listen_port == 0 && fwd->connect_port == 0) + goto fail_free; + + if (fwd->connect_host != NULL && + strlen(fwd->connect_host) >= NI_MAXHOST) + goto fail_free; + + return (i); + + fail_free: + if (fwd->connect_host != NULL) + xfree(fwd->connect_host); + if (fwd->listen_host != NULL) + xfree(fwd->listen_host); + return (0); +} |