mirror of git://anongit.mindrot.org/openssh.git
1039 lines
30 KiB
C
1039 lines
30 KiB
C
/*
|
|
* 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"
|
|
RCSID("$OpenBSD: readconf.c,v 1.130 2004/04/27 09:46:36 djm Exp $");
|
|
|
|
#include "ssh.h"
|
|
#include "xmalloc.h"
|
|
#include "compat.h"
|
|
#include "cipher.h"
|
|
#include "pathnames.h"
|
|
#include "log.h"
|
|
#include "readconf.h"
|
|
#include "match.h"
|
|
#include "misc.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
|
|
|
|
# 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,
|
|
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,
|
|
oDeprecated, oUnsupported
|
|
} OpCodes;
|
|
|
|
/* Textual representations of the tokens. */
|
|
|
|
static struct {
|
|
const char *name;
|
|
OpCodes opcode;
|
|
} keywords[] = {
|
|
{ "forwardagent", oForwardAgent },
|
|
{ "forwardx11", oForwardX11 },
|
|
{ "forwardx11trusted", oForwardX11Trusted },
|
|
{ "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 },
|
|
{ NULL, oBadOption }
|
|
};
|
|
|
|
/*
|
|
* Adds a local TCP/IP port forward to options. Never returns if there is an
|
|
* error.
|
|
*/
|
|
|
|
void
|
|
add_local_forward(Options *options, u_short port, const char *host,
|
|
u_short host_port)
|
|
{
|
|
Forward *fwd;
|
|
#ifndef NO_IPPORT_RESERVED_CONCEPT
|
|
extern uid_t original_real_uid;
|
|
if (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->port = port;
|
|
fwd->host = xstrdup(host);
|
|
fwd->host_port = host_port;
|
|
}
|
|
|
|
/*
|
|
* Adds a remote TCP/IP port forward to options. Never returns if there is
|
|
* an error.
|
|
*/
|
|
|
|
void
|
|
add_remote_forward(Options *options, u_short port, const char *host,
|
|
u_short host_port)
|
|
{
|
|
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->port = port;
|
|
fwd->host = xstrdup(host);
|
|
fwd->host_port = host_port;
|
|
}
|
|
|
|
static void
|
|
clear_forwardings(Options *options)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < options->num_local_forwards; i++)
|
|
xfree(options->local_forwards[i].host);
|
|
options->num_local_forwards = 0;
|
|
for (i = 0; i < options->num_remote_forwards; i++)
|
|
xfree(options->remote_forwards[i].host);
|
|
options->num_remote_forwards = 0;
|
|
}
|
|
|
|
/*
|
|
* 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 buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
|
|
int opcode, *intptr, value;
|
|
size_t len;
|
|
u_short fwd_port, fwd_host_port;
|
|
char sfwd_host_port[6];
|
|
|
|
/* 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). */
|
|
keyword = strdelim(&s);
|
|
/* 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 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);
|
|
value = strtol(arg, &endofnumber, 10);
|
|
if (arg == endofnumber)
|
|
fatal("%.200s line %d: Bad number.", filename, linenum);
|
|
switch (toupper(*endofnumber)) {
|
|
case 'K':
|
|
value *= 1<<10;
|
|
break;
|
|
case 'M':
|
|
value *= 1<<20;
|
|
break;
|
|
case 'G':
|
|
value *= 1<<30;
|
|
break;
|
|
}
|
|
if (*activep && *intptr == -1)
|
|
*intptr = value;
|
|
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:
|
|
if (s == NULL)
|
|
fatal("%.200s line %d: Missing argument.", filename, linenum);
|
|
charptr = &options->proxy_command;
|
|
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 || *arg == '\0')
|
|
fatal("%.200s line %d: Missing port argument.",
|
|
filename, linenum);
|
|
if ((fwd_port = a2port(arg)) == 0)
|
|
fatal("%.200s line %d: Bad listen port.",
|
|
filename, linenum);
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing second argument.",
|
|
filename, linenum);
|
|
if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
|
|
sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
|
|
fatal("%.200s line %d: Bad forwarding specification.",
|
|
filename, linenum);
|
|
if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
|
|
fatal("%.200s line %d: Bad forwarding port.",
|
|
filename, linenum);
|
|
if (*activep) {
|
|
if (opcode == oLocalForward)
|
|
add_local_forward(options, fwd_port, buf,
|
|
fwd_host_port);
|
|
else if (opcode == oRemoteForward)
|
|
add_remote_forward(options, fwd_port, buf,
|
|
fwd_host_port);
|
|
}
|
|
break;
|
|
|
|
case oDynamicForward:
|
|
arg = strdelim(&s);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing port argument.",
|
|
filename, linenum);
|
|
fwd_port = a2port(arg);
|
|
if (fwd_port == 0)
|
|
fatal("%.200s line %d: Badly formatted port number.",
|
|
filename, linenum);
|
|
if (*activep)
|
|
add_local_forward(options, fwd_port, "socks", 0);
|
|
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);
|
|
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 (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 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));
|
|
fclose(f);
|
|
return (0);
|
|
}
|
|
if (((sb.st_uid != 0 && sb.st_uid != getuid()) ||
|
|
(sb.st_mode & 022) != 0)) {
|
|
fatal("Bad owner or permissions on %s", filename);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
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->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;
|
|
}
|
|
|
|
/*
|
|
* 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->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;
|
|
/* 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 */
|
|
}
|