+/* $OpenBSD: readconf.c,v 1.152 2006/07/05 02:42:09 stevesk Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
*/
#include "includes.h"
-RCSID("$OpenBSD: readconf.c,v 1.134 2004/07/11 17:48:47 deraadt Exp $");
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
+#include <ctype.h>
#include "ssh.h"
#include "xmalloc.h"
Cipher none
PasswordAuthentication no
+ Host vpn.fake.com
+ Tunnel yes
+ TunnelDevice 3
+
# Defaults for various options
Host *
ForwardAgent no
oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
oAddressFamily, oGssAuthentication, oGssDelegateCreds,
oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly,
- oSendEnv, oControlPath, oControlMaster,
+ oSendEnv, oControlPath, oControlMaster, oHashKnownHosts,
+ oTunnel, oTunnelDevice, oLocalCommand, oPermitLocalCommand,
oDeprecated, oUnsupported
} OpCodes;
{ "sendenv", oSendEnv },
{ "controlpath", oControlPath },
{ "controlmaster", oControlMaster },
+ { "hashknownhosts", oHashKnownHosts },
+ { "tunnel", oTunnel },
+ { "tunneldevice", oTunnelDevice },
+ { "localcommand", oLocalCommand },
+ { "permitlocalcommand", oPermitLocalCommand },
{ NULL, oBadOption }
};
*/
void
-add_local_forward(Options *options, u_short port, const char *host,
- u_short host_port)
+add_local_forward(Options *options, const Forward *newfwd)
{
Forward *fwd;
#ifndef NO_IPPORT_RESERVED_CONCEPT
extern uid_t original_real_uid;
- if (port < IPPORT_RESERVED && original_real_uid != 0)
+ 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->port = port;
- fwd->host = xstrdup(host);
- fwd->host_port = host_port;
+
+ 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;
}
/*
*/
void
-add_remote_forward(Options *options, u_short port, const char *host,
- u_short host_port)
+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->port = port;
- fwd->host = xstrdup(host);
- fwd->host_port = host_port;
+
+ 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
{
int i;
- for (i = 0; i < options->num_local_forwards; i++)
- xfree(options->local_forwards[i].host);
+ 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++)
- xfree(options->remote_forwards[i].host);
+ 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;
}
/*
char *line, const char *filename, int linenum,
int *activep)
{
- char buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
- int opcode, *intptr, value;
+ char *s, **charptr, *endofnumber, *keyword, *arg, *arg2, fwdarg[256];
+ int opcode, *intptr, value, value2, scale;
+ long long orig, val64;
size_t len;
- u_short fwd_port, fwd_host_port;
- char sfwd_host_port[6];
+ Forward fwd;
/* Strip trailing whitespace */
- for(len = strlen(line) - 1; len > 0; len--) {
+ 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);
+ if ((keyword = strdelim(&s)) == NULL)
+ return 0;
/* Ignore leading whitespace. */
if (*keyword == '\0')
keyword = strdelim(&s);
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);
+ 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':
- value *= 1<<10;
+ scale = 1<<10;
break;
case 'M':
- value *= 1<<20;
+ scale = 1<<20;
break;
case 'G':
- value *= 1<<30;
+ 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 = value;
+ *intptr = (int)val64;
break;
case oIdentityFile:
goto parse_string;
case oProxyCommand:
+ charptr = &options->proxy_command;
+parse_command:
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);
case oLocalForward:
case oRemoteForward:
arg = strdelim(&s);
- if (!arg || *arg == '\0')
+ if (arg == NULL || *arg == '\0')
fatal("%.200s line %d: Missing port argument.",
filename, linenum);
- if ((fwd_port = a2port(arg)) == 0)
- fatal("%.200s line %d: Bad listen port.",
+ arg2 = strdelim(&s);
+ if (arg2 == NULL || *arg2 == '\0')
+ fatal("%.200s line %d: Missing target argument.",
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)
+
+ /* 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 ((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);
+ add_local_forward(options, &fwd);
else if (opcode == oRemoteForward)
- add_remote_forward(options, fwd_port, buf,
- fwd_host_port);
+ add_remote_forward(options, &fwd);
}
break;
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing port argument.",
filename, linenum);
- fwd_port = a2port(arg);
- if (fwd_port == 0)
+ 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_port, "socks", 0);
+ add_local_forward(options, &fwd);
break;
case oClearAllForwardings:
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;
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);
case oControlMaster:
intptr = &options->control_master;
- goto parse_yesnoask;
+ 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\"",
/* 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);
+ filename, linenum, arg);
}
return 0;
}
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;
}
/*
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);
+}
andersk / openssh.git / blobdiff