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strongswan/src/starter/confread.c

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/*
* Copyright (C) 2014 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* Copyright (C) 2001-2002 Mathieu Lafon - Arkoon Network Security
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <netdb.h>
#include <library.h>
#include <utils/debug.h>
#include "keywords.h"
#include "confread.h"
#include "args.h"
#include "files.h"
#include "parser/conf_parser.h"
#define IKE_LIFETIME_DEFAULT 10800 /* 3 hours */
#define IPSEC_LIFETIME_DEFAULT 3600 /* 1 hour */
#define SA_REPLACEMENT_MARGIN_DEFAULT 540 /* 9 minutes */
#define SA_REPLACEMENT_FUZZ_DEFAULT 100 /* 100% of margin */
#define SA_REPLACEMENT_RETRIES_DEFAULT 3
#define SA_REPLAY_WINDOW_DEFAULT -1 /* use charon.replay_window */
static const char ike_defaults[] = "aes128-sha256-curve25519";
static const char esp_defaults[] = "aes128-sha256";
static const char firewall_defaults[] = IPSEC_SCRIPT " _updown iptables";
/**
* Provided by GPERF
*/
extern const kw_entry_t *in_word_set(register const char*, register GPERF_LEN_TYPE);
/**
* Process deprecated keywords
*/
static bool is_deprecated(kw_token_t token, char *name, char *conn)
{
switch (token)
{
case KW_SETUP_DEPRECATED:
case KW_PKCS11_DEPRECATED:
DBG1(DBG_APP, "# deprecated keyword '%s' in config setup", name);
break;
case KW_CONN_DEPRECATED:
case KW_END_DEPRECATED:
case KW_PFS_DEPRECATED:
DBG1(DBG_APP, "# deprecated keyword '%s' in conn '%s'", name, conn);
break;
case KW_CA_DEPRECATED:
DBG1(DBG_APP, "# deprecated keyword '%s' in ca '%s'", name, conn);
break;
default:
return FALSE;
}
/* additional messages for some */
switch (token)
{
case KW_PKCS11_DEPRECATED:
DBG1(DBG_APP, " use the 'pkcs11' plugin instead");
break;
case KW_PFS_DEPRECATED:
DBG1(DBG_APP, " PFS is enabled by specifying a DH group in the "
"'esp' cipher suite");
break;
default:
break;
}
return TRUE;
}
/*
* parse config setup section
*/
static void load_setup(starter_config_t *cfg, conf_parser_t *parser)
{
enumerator_t *enumerator;
dictionary_t *dict;
const kw_entry_t *entry;
char *key, *value;
DBG2(DBG_APP, "Loading config setup");
dict = parser->get_section(parser, CONF_PARSER_CONFIG_SETUP, NULL);
if (!dict)
{
return;
}
enumerator = dict->create_enumerator(dict);
while (enumerator->enumerate(enumerator, &key, &value))
{
bool assigned = FALSE;
entry = in_word_set(key, strlen(key));
if (!entry)
{
DBG1(DBG_APP, "# unknown keyword '%s'", key);
cfg->non_fatal_err++;
continue;
}
if ((int)entry->token < KW_SETUP_FIRST || entry->token > KW_SETUP_LAST)
{
DBG1(DBG_APP, "# unsupported keyword '%s' in config setup", key);
cfg->err++;
continue;
}
if (is_deprecated(entry->token, key, ""))
{
cfg->non_fatal_err++;
continue;
}
if (!assign_arg(entry->token, KW_SETUP_FIRST, key, value, cfg,
&assigned))
{
DBG1(DBG_APP, " bad argument value in config setup");
cfg->err++;
}
}
enumerator->destroy(enumerator);
dict->destroy(dict);
}
/*
* parse a ca section
*/
static void load_ca(starter_ca_t *ca, starter_config_t *cfg,
conf_parser_t *parser)
{
enumerator_t *enumerator;
dictionary_t *dict;
const kw_entry_t *entry;
kw_token_t token;
char *key, *value;
DBG2(DBG_APP, "Loading ca '%s'", ca->name);
dict = parser->get_section(parser, CONF_PARSER_CA, ca->name);
if (!dict)
{
return;
}
enumerator = dict->create_enumerator(dict);
while (enumerator->enumerate(enumerator, &key, &value))
{
bool assigned = FALSE;
entry = in_word_set(key, strlen(key));
if (!entry)
{
DBG1(DBG_APP, "# unknown keyword '%s'", key);
cfg->non_fatal_err++;
continue;
}
token = entry->token;
if (token == KW_AUTO)
{
token = KW_CA_SETUP;
}
if (token < KW_CA_FIRST || token > KW_CA_LAST)
{
DBG1(DBG_APP, "# unsupported keyword '%s' in ca '%s'",
key, ca->name);
cfg->err++;
continue;
}
if (is_deprecated(token, key, ca->name))
{
cfg->non_fatal_err++;
continue;
}
if (!assign_arg(token, KW_CA_FIRST, key, value, ca, &assigned))
{
DBG1(DBG_APP, " bad argument value in ca '%s'", ca->name);
cfg->err++;
}
}
enumerator->destroy(enumerator);
dict->destroy(dict);
/* treat 'route' and 'start' as 'add' */
if (ca->startup != STARTUP_NO)
{
ca->startup = STARTUP_ADD;
}
}
/*
* set some default values
*/
static void conn_defaults(starter_conn_t *conn)
{
conn->startup = STARTUP_NO;
conn->state = STATE_IGNORE;
conn->mode = MODE_TUNNEL;
conn->options = SA_OPTION_MOBIKE;
conn->ike = strdupnull(ike_defaults);
/* esp defaults are set after parsing the conn section */
conn->sa_ike_life_seconds = IKE_LIFETIME_DEFAULT;
conn->sa_ipsec_life_seconds = IPSEC_LIFETIME_DEFAULT;
conn->sa_rekey_margin = SA_REPLACEMENT_MARGIN_DEFAULT;
conn->sa_rekey_fuzz = SA_REPLACEMENT_FUZZ_DEFAULT;
conn->sa_keying_tries = SA_REPLACEMENT_RETRIES_DEFAULT;
conn->install_policy = TRUE;
conn->dpd_delay = 30; /* seconds */
conn->dpd_timeout = 150; /* seconds */
conn->replay_window = SA_REPLAY_WINDOW_DEFAULT;
conn->fragmentation = FRAGMENTATION_YES;
conn->left.sendcert = CERT_SEND_IF_ASKED;
conn->right.sendcert = CERT_SEND_IF_ASKED;
conn->left.ikeport = 500;
conn->right.ikeport = 500;
conn->left.to_port = 0xffff;
conn->right.to_port = 0xffff;
}
/*
* parse left|right specific options
*/
static void kw_end(starter_conn_t *conn, starter_end_t *end, kw_token_t token,
char *key, char *value, starter_config_t *cfg)
{
bool assigned = FALSE;
if (is_deprecated(token, key, conn->name))
{
cfg->non_fatal_err++;
return;
}
if (!assign_arg(token, KW_END_FIRST, key, value, end, &assigned))
{
goto err;
}
/* post processing of some keywords that were assigned automatically */
switch (token)
{
case KW_HOST:
if (value && strlen(value) > 0 && value[0] == '%')
{
if (streq(value, "%defaultroute"))
{
value = "%any";
}
if (!streq(value, "%any") && !streq(value, "%any4") &&
!streq(value, "%any6"))
{ /* allow_any prefix */
end->allow_any = TRUE;
value++;
}
}
free(end->host);
end->host = strdupnull(value);
break;
case KW_SOURCEIP:
conn->mode = MODE_TUNNEL;
conn->proxy_mode = FALSE;
break;
case KW_SENDCERT:
if (end->sendcert == CERT_YES_SEND)
{
end->sendcert = CERT_ALWAYS_SEND;
}
else if (end->sendcert == CERT_NO_SEND)
{
end->sendcert = CERT_NEVER_SEND;
}
break;
default:
break;
}
if (assigned)
{
return;
}
/* individual processing of keywords that were not assigned automatically */
switch (token)
{
case KW_PROTOPORT:
{
struct protoent *proto;
struct servent *svc;
char *sep, *port = "", *endptr;
long int p;
sep = strchr(value, '/');
if (sep)
{ /* protocol/port */
*sep = '\0';
port = sep + 1;
}
if (streq(value, "%any"))
{
end->protocol = 0;
}
else
{
proto = getprotobyname(value);
if (proto)
{
end->protocol = proto->p_proto;
}
else
{
p = strtol(value, &endptr, 0);
if ((*value && *endptr) || p < 0 || p > 0xff)
{
DBG1(DBG_APP, "# bad protocol: %s=%s", key, value);
goto err;
}
end->protocol = (uint8_t)p;
}
}
if (streq(port, "%any"))
{
end->from_port = 0;
end->to_port = 0xffff;
}
else if (streq(port, "%opaque"))
{
end->from_port = 0xffff;
end->to_port = 0;
}
else if (*port)
{
svc = getservbyname(port, NULL);
if (svc)
{
end->from_port = end->to_port = ntohs(svc->s_port);
}
else
{
p = strtol(port, &endptr, 0);
if (p < 0 || p > 0xffff)
{
DBG1(DBG_APP, "# bad port: %s=%s", key, port);
goto err;
}
end->from_port = p;
if (*endptr == '-')
{
port = endptr + 1;
p = strtol(port, &endptr, 0);
if (p < 0 || p > 0xffff)
{
DBG1(DBG_APP, "# bad port: %s=%s", key, port);
goto err;
}
}
end->to_port = p;
if (*endptr)
{
DBG1(DBG_APP, "# bad port: %s=%s", key, port);
goto err;
}
}
}
if (sep)
{ /* restore the original text in case also= is used */
*sep = '/';
}
break;
}
default:
break;
}
return;
err:
DBG1(DBG_APP, " bad argument value in conn '%s'", conn->name);
cfg->err++;
}
/*
* macro to handle simple flags
*/
#define KW_SA_OPTION_FLAG(sy, sn, fl) \
if (streq(value, sy)) { conn->options |= fl; } \
else if (streq(value, sn)) { conn->options &= ~fl; } \
else { DBG1(DBG_APP, "# bad option value: %s=%s", key, value); cfg->err++; }
/*
* parse settings not handled by the simple argument parser
*/
static void handle_keyword(kw_token_t token, starter_conn_t *conn, char *key,
char *value, starter_config_t *cfg)
{
if ((token == KW_ESP && conn->ah) || (token == KW_AH && conn->esp))
{
DBG1(DBG_APP, "# can't have both 'ah' and 'esp' options");
cfg->err++;
return;
}
switch (token)
{
case KW_TYPE:
{
conn->mode = MODE_TRANSPORT;
conn->proxy_mode = FALSE;
if (streq(value, "tunnel"))
{
conn->mode = MODE_TUNNEL;
}
else if (streq(value, "beet"))
{
conn->mode = MODE_BEET;
}
else if (streq(value, "transport_proxy"))
{
conn->mode = MODE_TRANSPORT;
conn->proxy_mode = TRUE;
}
else if (streq(value, "passthrough") || streq(value, "pass"))
{
conn->mode = MODE_PASS;
}
else if (streq(value, "drop") || streq(value, "reject"))
{
conn->mode = MODE_DROP;
}
else if (!streq(value, "transport"))
{
DBG1(DBG_APP, "# bad policy value: %s=%s", key, value);
cfg->err++;
}
break;
}
case KW_COMPRESS:
KW_SA_OPTION_FLAG("yes", "no", SA_OPTION_COMPRESS)
break;
case KW_MARK:
if (!mark_from_string(value, &conn->mark_in))
{
cfg->err++;
break;
}
conn->mark_out = conn->mark_in;
break;
case KW_MARK_IN:
if (!mark_from_string(value, &conn->mark_in))
{
cfg->err++;
}
break;
case KW_MARK_OUT:
if (!mark_from_string(value, &conn->mark_out))
{
cfg->err++;
}
break;
case KW_TFC:
if (streq(value, "%mtu"))
{
conn->tfc = -1;
}
else
{
char *endptr;
conn->tfc = strtoul(value, &endptr, 10);
if (*endptr != '\0')
{
DBG1(DBG_APP, "# bad integer value: %s=%s", key, value);
cfg->err++;
}
}
break;
case KW_KEYINGTRIES:
if (streq(value, "%forever"))
{
conn->sa_keying_tries = 0;
}
else
{
char *endptr;
conn->sa_keying_tries = strtoul(value, &endptr, 10);
if (*endptr != '\0')
{
DBG1(DBG_APP, "# bad integer value: %s=%s", key, value);
cfg->err++;
}
}
break;
case KW_REKEY:
KW_SA_OPTION_FLAG("no", "yes", SA_OPTION_DONT_REKEY)
break;
case KW_REAUTH:
KW_SA_OPTION_FLAG("no", "yes", SA_OPTION_DONT_REAUTH)
break;
case KW_MOBIKE:
KW_SA_OPTION_FLAG("yes", "no", SA_OPTION_MOBIKE)
break;
case KW_FORCEENCAPS:
KW_SA_OPTION_FLAG("yes", "no", SA_OPTION_FORCE_ENCAP)
break;
case KW_MODECONFIG:
KW_SA_OPTION_FLAG("push", "pull", SA_OPTION_MODECFG_PUSH)
break;
case KW_XAUTH:
KW_SA_OPTION_FLAG("server", "client", SA_OPTION_XAUTH_SERVER)
break;
default:
break;
}
}
/*
* handles left|rightfirewall and left|rightupdown parameters
*/
static void handle_firewall(const char *label, starter_end_t *end,
starter_config_t *cfg)
{
if (end->firewall)
{
if (end->updown != NULL)
{
DBG1(DBG_APP, "# cannot have both %sfirewall and %supdown", label,
label);
cfg->err++;
}
else
{
end->updown = strdupnull(firewall_defaults);
end->firewall = FALSE;
}
}
}
/*
* parse a conn section
*/
static void load_conn(starter_conn_t *conn, starter_config_t *cfg,
conf_parser_t *parser)
{
enumerator_t *enumerator;
dictionary_t *dict;
const kw_entry_t *entry;
kw_token_t token;
char *key, *value;
DBG2(DBG_APP, "Loading conn '%s'", conn->name);
dict = parser->get_section(parser, CONF_PARSER_CONN, conn->name);
if (!dict)
{
return;
}
enumerator = dict->create_enumerator(dict);
while (enumerator->enumerate(enumerator, &key, &value))
{
bool assigned = FALSE;
entry = in_word_set(key, strlen(key));
if (!entry)
{
DBG1(DBG_APP, "# unknown keyword '%s'", key);
cfg->non_fatal_err++;
continue;
}
token = entry->token;
if (token >= KW_LEFT_FIRST && token <= KW_LEFT_LAST)
{
kw_end(conn, &conn->left, token - KW_LEFT_FIRST + KW_END_FIRST,
key, value, cfg);
continue;
}
else if (token >= KW_RIGHT_FIRST && token <= KW_RIGHT_LAST)
{
kw_end(conn, &conn->right, token - KW_RIGHT_FIRST + KW_END_FIRST,
key, value, cfg);
continue;
}
if (token == KW_AUTO)
{
token = KW_CONN_SETUP;
}
if (token < KW_CONN_FIRST || token > KW_CONN_LAST)
{
DBG1(DBG_APP, "# unsupported keyword '%s' in conn '%s'",
key, conn->name);
cfg->err++;
continue;
}
if (is_deprecated(token, key, conn->name))
{
cfg->non_fatal_err++;
continue;
}
if (!assign_arg(token, KW_CONN_FIRST, key, value, conn,
&assigned))
{
DBG1(DBG_APP, " bad argument value in conn '%s'", conn->name);
cfg->err++;
continue;
}
if (!assigned)
{
handle_keyword(token, conn, key, value, cfg);
}
}
enumerator->destroy(enumerator);
dict->destroy(dict);
handle_firewall("left", &conn->left, cfg);
handle_firewall("right", &conn->right, cfg);
if (!conn->esp && !conn->ah)
{
conn->esp = strdupnull(esp_defaults);
}
}
/*
* free the memory used by a starter_ca_t object
*/
static void confread_free_ca(starter_ca_t *ca)
{
free_args(KW_CA_NAME, KW_CA_LAST, (char *)ca);
free(ca);
}
/*
* free the memory used by a starter_conn_t object
*/
static void confread_free_conn(starter_conn_t *conn)
{
free_args(KW_END_FIRST, KW_END_LAST, (char *)&conn->left);
free_args(KW_END_FIRST, KW_END_LAST, (char *)&conn->right);
free_args(KW_CONN_NAME, KW_CONN_LAST, (char *)conn);
free(conn);
}
/*
* free the memory used by a starter_config_t object
*/
void confread_free(starter_config_t *cfg)
{
starter_conn_t *conn = cfg->conn_first;
starter_ca_t *ca = cfg->ca_first;
free_args(KW_SETUP_FIRST, KW_SETUP_LAST, (char *)cfg);
while (conn != NULL)
{
starter_conn_t *conn_aux = conn;
conn = conn->next;
confread_free_conn(conn_aux);
}
while (ca != NULL)
{
starter_ca_t *ca_aux = ca;
ca = ca->next;
confread_free_ca(ca_aux);
}
free(cfg);
}
/*
* load and parse an IPsec configuration file
*/
starter_config_t* confread_load(const char *file)
{
conf_parser_t *parser;
starter_config_t *cfg = NULL;
enumerator_t *enumerator;
u_int total_err;
char *name;
parser = conf_parser_create(file);
if (!parser->parse(parser))
{
parser->destroy(parser);
return NULL;
}
INIT(cfg,
.setup = {
.uniqueids = TRUE,
}
);
/* load config setup section */
load_setup(cfg, parser);
/* load ca sections */
enumerator = parser->get_sections(parser, CONF_PARSER_CA);
while (enumerator->enumerate(enumerator, &name))
{
u_int previous_err = cfg->err;
starter_ca_t *ca;
INIT(ca,
.name = strdup(name),
);
load_ca(ca, cfg, parser);
if (cfg->err > previous_err)
{
total_err = cfg->err - previous_err;
DBG1(DBG_APP, "# ignored ca '%s' due to %d parsing error%s", name,
total_err, (total_err > 1) ? "s" : "");
confread_free_ca(ca);
cfg->non_fatal_err += cfg->err - previous_err;
cfg->err = previous_err;
}
else
{
if (cfg->ca_last)
{
cfg->ca_last->next = ca;
}
cfg->ca_last = ca;
if (!cfg->ca_first)
{
cfg->ca_first = ca;
}
if (ca->startup != STARTUP_NO)
{
ca->state = STATE_TO_ADD;
}
}
}
enumerator->destroy(enumerator);
/* load conn sections */
enumerator = parser->get_sections(parser, CONF_PARSER_CONN);
while (enumerator->enumerate(enumerator, &name))
{
u_int previous_err = cfg->err;
starter_conn_t *conn;
INIT(conn,
.name = strdup(name),
);
conn_defaults(conn);
load_conn(conn, cfg, parser);
if (cfg->err > previous_err)
{
total_err = cfg->err - previous_err;
DBG1(DBG_APP, "# ignored conn '%s' due to %d parsing error%s", name,
total_err, (total_err > 1) ? "s" : "");
confread_free_conn(conn);
cfg->non_fatal_err += cfg->err - previous_err;
cfg->err = previous_err;
}
else
{
if (cfg->conn_last)
{
cfg->conn_last->next = conn;
}
cfg->conn_last = conn;
if (!cfg->conn_first)
{
cfg->conn_first = conn;
}
if (conn->startup != STARTUP_NO)
{
conn->state = STATE_TO_ADD;
}
}
}
enumerator->destroy(enumerator);
parser->destroy(parser);
total_err = cfg->err + cfg->non_fatal_err;
if (total_err > 0)
{
DBG1(DBG_APP, "### %d parsing error%s (%d fatal) ###",
total_err, (total_err > 1)?"s":"", cfg->err);
}
return cfg;
}
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