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nm-l2tp-service.c
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nm-l2tp-service.c
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* nm-l2tp-service - L2TP VPN integration with NetworkManager
*
* Geo Carncross <geocar@gmail.com>
* Alexey Torkhov <atorkhov@gmail.com>
* Based on work by Dan Williams <dcbw@redhat.com>
*
* (C) Copyright 2008 - 2009 Red Hat, Inc.
* (C) Copyright 2011 Alexey Torkhov <atorkhov@gmail.com>
* (C) Copyright 2011 Geo Carncross <geocar@gmail.com>
* (C) Copyright 2012 Sergey Prokhorov <me@seriyps.ru>
* (C) Copyright 2014 Nathan Dorfman <ndorf@rtfm.net>
* (C) Copyright 2016 - 2020 Douglas Kosovic <doug@uq.edu.au>
*/
#include "nm-default.h"
#include "nm-l2tp-service.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <ctype.h>
#include <locale.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "nm-l2tp-pppd-status.h"
#include "nm-l2tp-pppd-service-dbus.h"
#include "nm-utils/nm-shared-utils.h"
#include "nm-utils/nm-secret-utils.h"
#include "nm-utils/nm-vpn-plugin-macros.h"
#include "shared/utils.h"
#include "nm-l2tp-crypto-nss.h"
#include "nm-l2tp-crypto-openssl.h"
#ifndef DIST_VERSION
#define DIST_VERSION VERSION
#endif
#ifndef RUNSTATEDIR
#define RUNSTATEDIR "/run"
#endif
static struct {
gboolean debug;
int log_level;
} gl /*lobal*/;
static void nm_l2tp_plugin_initable_iface_init(GInitableIface *iface);
G_DEFINE_TYPE_WITH_CODE(NML2tpPlugin,
nm_l2tp_plugin,
NM_TYPE_VPN_SERVICE_PLUGIN,
G_IMPLEMENT_INTERFACE(G_TYPE_INITABLE, nm_l2tp_plugin_initable_iface_init));
typedef enum { PASSWORD_AUTH, TLS_AUTH, PSK_AUTH } NML2tpAuthType;
typedef struct {
GPid pid_l2tpd;
gboolean ipsec_up;
guint32 ppp_timeout_handler;
NMConnection * connection;
NMDBusL2tpPpp * dbus_skeleton;
char ipsec_binary_path[256];
char * uuid;
NML2tpAuthType user_authtype;
NML2tpAuthType machine_authtype;
NML2tpIpsecDaemon ipsec_daemon;
NML2tpL2tpDaemon l2tp_daemon;
/* IP of L2TP gateway in numeric and string format */
guint32 naddr;
char * saddr;
/* Local IP route to the L2TP gateway */
char * slocaladdr;
} NML2tpPluginPrivate;
#define NM_L2TP_PLUGIN_GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE((o), NM_TYPE_L2TP_PLUGIN, NML2tpPluginPrivate))
#define NM_L2TP_PPPD_PLUGIN PLUGINDIR "/nm-l2tp-pppd-plugin.so"
#define NM_L2TP_WAIT_IPSEC 16000 /* 16 seconds */
#define NM_L2TP_WAIT_PPPD 16000 /* 16 seconds */
#define L2TP_SERVICE_SECRET_TRIES "l2tp-service-secret-tries"
/* Default Phase 1 (Main Mode) and Phase 2 (Quick Mode) proposals which are a
* merge of Windows 10 and macOS/iOS/iPadOS L2TP/IPsec clients' IKEv1 proposal
* algorithms */
#define STRONGSWAN_IKEV1_ALGORITHMS_PHASE1 \
"aes256-sha2_256-modp2048,aes256-sha2_256-modp1536,aes256-sha2_256-modp1024,aes256-sha1-" \
"modp2048,aes256-sha1-modp1536,aes256-sha1-modp1024,aes256-sha1-ecp384,aes128-sha1-modp1024," \
"aes128-sha1-ecp256,3des-sha1-modp2048,3des-sha1-modp1024!"
#define STRONGSWAN_IKEV1_ALGORITHMS_PHASE2 "aes256-sha1,aes128-sha1,3des-sha1!"
#ifdef LIBRESWAN_DH2 /* DH2(modp1024) enabled with configure time --enable_libreswan_dh2 switch */
#define LIBRESWAN_IKEV1_ALGORITHMS_PHASE1 \
"aes256-sha2_256-modp2048,aes256-sha2_256-modp1536,aes256-sha2_256-modp1024,aes256-sha1-" \
"modp2048,aes256-sha1-modp1536,aes256-sha1-modp1024,aes256-sha1-ecp_384,aes128-sha1-modp1024," \
"aes128-sha1-ecp_256,3des-sha1-modp2048,3des-sha1-modp1024"
#else
#define LIBRESWAN_IKEV1_ALGORITHMS_PHASE1 \
"aes256-sha2_256-modp2048,aes256-sha2_256-modp1536,aes256-sha1-modp2048,aes256-sha1-modp1536," \
"aes256-sha1-ecp_384,aes128-sha1-ecp_256,3des-sha1-modp2048"
#endif
#define LIBRESWAN_IKEV1_ALGORITHMS_PHASE2 "aes256-sha1,aes128-sha1,3des-sha1"
/*****************************************************************************/
#define _NMLOG(level, ...) \
G_STMT_START \
{ \
if (gl.log_level >= (level)) { \
g_print("nm-l2tp[%ld] %-7s " _NM_UTILS_MACRO_FIRST(__VA_ARGS__) "\n", \
(long) getpid(), \
nm_utils_syslog_to_str(level) _NM_UTILS_MACRO_REST(__VA_ARGS__)); \
} \
} \
G_STMT_END
static gboolean
_LOGD_enabled(void)
{
return gl.log_level >= LOG_INFO;
}
#define _LOGD(...) _NMLOG(LOG_INFO, __VA_ARGS__)
#define _LOGI(...) _NMLOG(LOG_NOTICE, __VA_ARGS__)
#define _LOGW(...) _NMLOG(LOG_WARNING, __VA_ARGS__)
/*****************************************************************************/
/* Legacy KDE Plasma-nm L2TP keys */
#define KDE_PLASMA_L2TP_KEY_USE_CERT "use-cert"
#define KDE_PLASMA_L2TP_KEY_CERT_PUB "cert-pub"
#define KDE_PLASMA_L2TP_KEY_CERT_CA "cert-ca"
#define KDE_PLASMA_L2TP_KEY_CERT_KEY "cert-key"
typedef struct {
const char *name;
GType type;
bool required : 1;
} ValidProperty;
static const ValidProperty valid_properties[] = {
{NM_L2TP_KEY_GATEWAY, G_TYPE_STRING, TRUE},
{NM_L2TP_KEY_USER_AUTH_TYPE, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_USER, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_DOMAIN, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_EPHEMERAL_PORT, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_USER_CA, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_USER_CERT, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_USER_KEY, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_MTU, G_TYPE_UINT, FALSE},
{NM_L2TP_KEY_MRU, G_TYPE_UINT, FALSE},
{NM_L2TP_KEY_MRRU, G_TYPE_UINT, FALSE},
{NM_L2TP_KEY_REFUSE_EAP, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_REFUSE_PAP, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_REFUSE_CHAP, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_REFUSE_MSCHAP, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_REFUSE_MSCHAPV2, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_REQUIRE_MPPE, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_REQUIRE_MPPE_40, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_REQUIRE_MPPE_128, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_MPPE_STATEFUL, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_NOBSDCOMP, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_NODEFLATE, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_NO_VJ_COMP, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_NO_PCOMP, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_NO_ACCOMP, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_LCP_ECHO_FAILURE, G_TYPE_UINT, FALSE},
{NM_L2TP_KEY_LCP_ECHO_INTERVAL, G_TYPE_UINT, FALSE},
{NM_L2TP_KEY_UNIT_NUM, G_TYPE_UINT, FALSE},
{NM_L2TP_KEY_MACHINE_AUTH_TYPE, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_MACHINE_CA, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_MACHINE_CERT, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_MACHINE_KEY, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_IPSEC_ENABLE, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_IPSEC_REMOTE_ID, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_IPSEC_GATEWAY_ID, G_TYPE_STRING, FALSE},
/* For legacy purposes, the PSK can also be specified as a non-secret */
{NM_L2TP_KEY_IPSEC_PSK, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_IPSEC_IKE, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_IPSEC_ESP, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_IPSEC_IKELIFETIME, G_TYPE_UINT, FALSE},
{NM_L2TP_KEY_IPSEC_SALIFETIME, G_TYPE_UINT, FALSE},
{NM_L2TP_KEY_IPSEC_FORCEENCAPS, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_IPSEC_IPCOMP, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_IPSEC_IKEV2, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_IPSEC_PFS, G_TYPE_BOOLEAN, FALSE},
{NM_L2TP_KEY_PASSWORD "-flags", G_TYPE_UINT, FALSE},
{NM_L2TP_KEY_USER_CERTPASS "-flags", G_TYPE_UINT, FALSE},
{NM_L2TP_KEY_IPSEC_PSK "-flags", G_TYPE_UINT, FALSE},
{NM_L2TP_KEY_MACHINE_CERTPASS "-flags", G_TYPE_UINT, FALSE},
{KDE_PLASMA_L2TP_KEY_USE_CERT, G_TYPE_UINT, FALSE},
{KDE_PLASMA_L2TP_KEY_CERT_CA, G_TYPE_STRING, FALSE},
{KDE_PLASMA_L2TP_KEY_CERT_PUB, G_TYPE_STRING, FALSE},
{KDE_PLASMA_L2TP_KEY_CERT_KEY, G_TYPE_STRING, FALSE},
{NULL}};
static ValidProperty valid_secrets[] = {{NM_L2TP_KEY_PASSWORD, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_USER_CERTPASS, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_IPSEC_PSK, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_MACHINE_CERTPASS, G_TYPE_STRING, FALSE},
{NM_L2TP_KEY_NOSECRET, G_TYPE_STRING, FALSE},
{NULL}};
static gboolean
nm_l2tp_ipsec_error(GError **error, const char *msg)
{
g_set_error_literal(error, NM_VPN_PLUGIN_ERROR, NM_VPN_PLUGIN_ERROR_LAUNCH_FAILED, msg);
return FALSE;
}
static gboolean
has_include_ipsec_secrets(const char *ipsec_secrets_file)
{
g_autofree char *contents = NULL;
g_auto(GStrv) all_lines = NULL;
if (!g_file_get_contents(ipsec_secrets_file, &contents, NULL, NULL))
return FALSE;
all_lines = g_strsplit(contents, "\n", 0);
for (int i = 0; all_lines[i]; i++) {
if (g_str_has_prefix(all_lines[i], "include ")) {
if (strstr(all_lines[i], "ipsec.d/ipsec.nm-l2tp.secrets"))
return TRUE;
}
}
return FALSE;
}
static gboolean
validate_gateway(const char *gateway)
{
const char *p = gateway;
if (!gateway || !gateway[0])
return FALSE;
/* Ensure it's a valid DNS name or IP address */
p = gateway;
while (*p) {
if (!isalnum(*p) && (*p != '-') && (*p != '.'))
return FALSE;
p++;
}
return TRUE;
}
typedef struct ValidateInfo {
const ValidProperty *table;
GError ** error;
gboolean have_items;
} ValidateInfo;
static void
validate_one_property(const char *key, const char *value, gpointer user_data)
{
ValidateInfo *info = (ValidateInfo *) user_data;
int i;
if (*(info->error))
return;
info->have_items = TRUE;
/* 'name' is the setting name; always allowed but unused */
if (!strcmp(key, NM_SETTING_NAME))
return;
for (i = 0; info->table[i].name; i++) {
const ValidProperty prop = info->table[i];
long int tmp;
if (strcmp(prop.name, key))
continue;
switch (prop.type) {
case G_TYPE_STRING:
if (!strcmp(prop.name, NM_L2TP_KEY_GATEWAY)) {
if (validate_gateway(value))
return; /* valid */
g_set_error(info->error,
NM_VPN_PLUGIN_ERROR,
NM_VPN_PLUGIN_ERROR_BAD_ARGUMENTS,
_("invalid gateway '%s'"),
value);
}
return;
case G_TYPE_UINT:
errno = 0;
tmp = strtol(value, NULL, 10);
if (errno == 0)
return; /* valid */
g_set_error(info->error,
NM_VPN_PLUGIN_ERROR,
NM_VPN_PLUGIN_ERROR_BAD_ARGUMENTS,
_("invalid integer property '%s'"),
key);
break;
case G_TYPE_BOOLEAN:
if (nm_streq(value, "yes") || nm_streq(value, "no"))
return; /* valid */
g_set_error(info->error,
NM_VPN_PLUGIN_ERROR,
NM_VPN_PLUGIN_ERROR_BAD_ARGUMENTS,
_("invalid boolean property '%s' (not yes or no)"),
key);
break;
default:
g_set_error(info->error,
NM_VPN_PLUGIN_ERROR,
NM_VPN_PLUGIN_ERROR_BAD_ARGUMENTS,
_("unhandled property '%s' type %s"),
key,
g_type_name(prop.type));
break;
}
}
/* Did not find the property from valid_properties or the type did not match */
if (!info->table[i].name) {
g_set_error(info->error,
NM_VPN_PLUGIN_ERROR,
NM_VPN_PLUGIN_ERROR_BAD_ARGUMENTS,
_("property '%s' invalid or not supported"),
key);
}
}
static gboolean
nm_l2tp_properties_validate(NMSettingVpn *s_vpn, GError **error)
{
ValidateInfo info = {&valid_properties[0], error, FALSE};
int i;
nm_setting_vpn_foreach_data_item(s_vpn, validate_one_property, &info);
if (!info.have_items) {
g_set_error(error,
NM_VPN_PLUGIN_ERROR,
NM_VPN_PLUGIN_ERROR_BAD_ARGUMENTS,
"%s",
_("No VPN configuration options."));
return FALSE;
}
if (*error)
return FALSE;
/* Ensure required properties exist */
for (i = 0; valid_properties[i].name; i++) {
const ValidProperty prop = valid_properties[i];
const char * value;
if (!prop.required)
continue;
value = nm_setting_vpn_get_data_item(s_vpn, prop.name);
if (!value || !strlen(value)) {
g_set_error(error,
NM_VPN_PLUGIN_ERROR,
NM_VPN_PLUGIN_ERROR_BAD_ARGUMENTS,
_("Missing required option '%s'."),
prop.name);
return FALSE;
}
}
return TRUE;
}
static gboolean
nm_l2tp_secrets_validate(NMSettingVpn *s_vpn, GError **error)
{
GError * validate_error = NULL;
ValidateInfo info = {&valid_secrets[0], error, FALSE};
nm_setting_vpn_foreach_secret(s_vpn, validate_one_property, &info);
if (validate_error) {
g_propagate_error(error, validate_error);
return FALSE;
}
return TRUE;
}
static void nm_l2tp_stop_ipsec(NML2tpPluginPrivate *priv);
static void
l2tpd_watch_cb(GPid pid, gint status, gpointer user_data)
{
NML2tpPlugin * plugin = NM_L2TP_PLUGIN(user_data);
NML2tpPluginPrivate *priv = NM_L2TP_PLUGIN_GET_PRIVATE(plugin);
guint error = 0;
if (priv->l2tp_daemon == NM_L2TP_L2TP_DAEMON_KL2TPD) {
if (WIFEXITED(status)) {
error = WEXITSTATUS(status);
if (error != 0)
_LOGW("kl2tpd exited with error code %d", error);
} else if (WIFSTOPPED(status))
_LOGW("kl2tpd stopped unexpectedly with signal %d", WSTOPSIG(status));
else if (WIFSIGNALED(status))
_LOGW("kl2tpd died with signal %d", WTERMSIG(status));
else
_LOGW("kl2tpd died from an unknown cause");
} else {
if (WIFEXITED(status)) {
error = WEXITSTATUS(status);
if (error != 0)
_LOGW("xl2tpd exited with error code %d", error);
} else if (WIFSTOPPED(status))
_LOGW("xl2tpd stopped unexpectedly with signal %d", WSTOPSIG(status));
else if (WIFSIGNALED(status))
_LOGW("xl2tpd died with signal %d", WTERMSIG(status));
else
_LOGW("xl2tpd died from an unknown cause");
}
/* Reap child if needed. */
waitpid(priv->pid_l2tpd, NULL, WNOHANG);
priv->pid_l2tpd = 0;
if (priv->ipsec_up) {
nm_l2tp_stop_ipsec(priv);
}
/* Must be after data->state is set since signals use data->state */
switch (error) {
case 16:
/* hangup */
// FIXME: better failure reason
nm_vpn_service_plugin_failure(NM_VPN_SERVICE_PLUGIN(plugin),
NM_VPN_PLUGIN_FAILURE_CONNECT_FAILED);
break;
case 2:
/* Couldn't log in due to bad user/pass */
nm_vpn_service_plugin_failure(NM_VPN_SERVICE_PLUGIN(plugin),
NM_VPN_PLUGIN_FAILURE_LOGIN_FAILED);
break;
case 1:
/* Other error (couldn't bind to address, etc) */
nm_vpn_service_plugin_failure(NM_VPN_SERVICE_PLUGIN(plugin),
NM_VPN_PLUGIN_FAILURE_CONNECT_FAILED);
break;
default:
nm_vpn_service_plugin_disconnect(NM_VPN_SERVICE_PLUGIN(plugin), NULL);
break;
}
}
static gboolean
pppd_timed_out(gpointer user_data)
{
NML2tpPlugin *plugin = NM_L2TP_PLUGIN(user_data);
_LOGW("Looks like pppd didn't initialize our dbus module");
nm_vpn_service_plugin_failure(NM_VPN_SERVICE_PLUGIN(plugin),
NM_VPN_PLUGIN_FAILURE_CONNECT_FAILED);
return FALSE;
}
static void
free_l2tpd_args(GPtrArray *args)
{
int i;
if (!args)
return;
for (i = 0; i < args->len; i++)
g_free(g_ptr_array_index(args, i));
g_ptr_array_free(args, TRUE);
}
static gboolean
str_to_int(const char *str, long int *out)
{
long int tmp_int;
if (!str)
return FALSE;
errno = 0;
tmp_int = strtol(str, NULL, 10);
if (errno == 0) {
*out = tmp_int;
return TRUE;
}
return FALSE;
}
static inline void
write_config_option(int fd, const char *format, ...)
{
char * string;
va_list args;
int x;
va_start(args, format);
string = g_strdup_vprintf(format, args);
x = write(fd, string, strlen(string));
g_free(string);
va_end(args);
}
typedef struct {
const char *name;
GType type;
const char *write_to_config;
} PPPOpt;
static PPPOpt ppp_auth_options[] = {
{NM_L2TP_KEY_REFUSE_EAP, G_TYPE_BOOLEAN, "refuse-eap\n"},
{NM_L2TP_KEY_REFUSE_PAP, G_TYPE_BOOLEAN, "refuse-pap\n"},
{NM_L2TP_KEY_REFUSE_CHAP, G_TYPE_BOOLEAN, "refuse-chap\n"},
{NM_L2TP_KEY_REFUSE_MSCHAP, G_TYPE_BOOLEAN, "refuse-mschap\n"},
{NM_L2TP_KEY_REFUSE_MSCHAPV2, G_TYPE_BOOLEAN, "refuse-mschap-v2\n"},
{NULL, G_TYPE_NONE, NULL}};
static PPPOpt ppp_options[] = {{NM_L2TP_KEY_REQUIRE_MPPE, G_TYPE_BOOLEAN, "require-mppe\n"},
{NM_L2TP_KEY_REQUIRE_MPPE_40, G_TYPE_BOOLEAN, "require-mppe-40\n"},
{NM_L2TP_KEY_REQUIRE_MPPE_128, G_TYPE_BOOLEAN, "require-mppe-128\n"},
{NM_L2TP_KEY_MPPE_STATEFUL, G_TYPE_BOOLEAN, "mppe-stateful\n"},
{NM_L2TP_KEY_NOBSDCOMP, G_TYPE_BOOLEAN, "nobsdcomp\n"},
{NM_L2TP_KEY_NODEFLATE, G_TYPE_BOOLEAN, "nodeflate\n"},
{NM_L2TP_KEY_NO_VJ_COMP, G_TYPE_BOOLEAN, "novj\n"},
{NM_L2TP_KEY_NO_PCOMP, G_TYPE_BOOLEAN, "nopcomp\n"},
{NM_L2TP_KEY_NO_ACCOMP, G_TYPE_BOOLEAN, "noaccomp\n"},
{NULL, G_TYPE_NONE, NULL}};
/**
* Check that specified UDP socket in 0.0.0.0 is not used and we can bind to it.
**/
static gboolean
is_port_free(int port)
{
struct sockaddr_in addr;
int sock;
g_message("Check port %d", port);
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (!sock) {
_LOGW("Can-not create new test socket");
return FALSE;
}
memset(&addr, 0, sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = INADDR_ANY;
if (bind(sock, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
g_message("Can't bind to port %d", port);
return FALSE;
}
close(sock); /* unbind */
return TRUE;
}
static gboolean
nm_l2tp_config_write(NML2tpPlugin *plugin, NMSettingVpn *s_vpn, GError **error)
{
GError * config_error = NULL;
NML2tpPluginPrivate * priv = NM_L2TP_PLUGIN_GET_PRIVATE(plugin);
NMSettingIPConfig * s_ip4;
const char * ipsec_secrets_file;
const char * ipsec_conf_dir;
const char * value;
char * filename;
g_autofree char * friendly_name = NULL;
g_autofree char * rundir;
char errorbuf[128];
gint fd = -1;
gint64 max_retries;
FILE * fp;
struct in_addr naddr;
int port;
int errsv;
gboolean use_ephemeral_port;
gboolean use_ikev2;
gboolean tls_need_password;
gboolean is_local_set = FALSE;
g_autofree char * pwd_base64 = NULL;
const char * tls_key_filename = NULL;
const char * tls_cert_filename = NULL;
const char * tls_ca_filename = NULL;
g_autofree char * tls_key_out_filename = NULL;
g_autofree char * tls_cert_out_filename = NULL;
g_autofree char * tls_ca_out_filename = NULL;
NML2tpCryptoFileFormat tls_key_fileformat = NM_L2TP_CRYPTO_FILE_FORMAT_UNKNOWN;
NML2tpCryptoFileFormat tls_cert_fileformat = NM_L2TP_CRYPTO_FILE_FORMAT_UNKNOWN;
NML2tpCryptoFileFormat tls_ca_fileformat = NM_L2TP_CRYPTO_FILE_FORMAT_UNKNOWN;
GByteArray * p12_array = NULL;
GString * subject_name_str;
GByteArray *subject_name_asn1;
rundir = g_strdup_printf(RUNSTATEDIR "/nm-l2tp-%s", priv->uuid);
if (!g_file_test(rundir, G_FILE_TEST_IS_DIR)) {
/* Setup runtime directory */
if (mkdir(rundir, 0700) != 0) {
errsv = errno;
g_set_error(error,
NM_VPN_PLUGIN_ERROR,
NM_VPN_PLUGIN_ERROR_BAD_ARGUMENTS,
"Cannot create run-dir %s (%s)",
rundir,
g_strerror(errsv));
return FALSE;
}
}
value = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_EPHEMERAL_PORT);
if (nm_streq0(value, "yes")) {
use_ephemeral_port = TRUE;
} else {
/* Check that UDP port 1701 for is free for L2TP source port */
use_ephemeral_port = !is_port_free(1701);
if (use_ephemeral_port) {
_LOGW("L2TP port 1701 is busy, using ephemeral.");
}
}
/* Map deprecated Gateway ID to Remote ID */
value = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_IPSEC_GATEWAY_ID);
if (value) {
nm_setting_vpn_add_data_item(s_vpn, NM_L2TP_KEY_IPSEC_REMOTE_ID, value);
}
/* Map legacy KDE Plasma-nm keys to equivalent new keys */
value = nm_setting_vpn_get_data_item(s_vpn, KDE_PLASMA_L2TP_KEY_USE_CERT);
if (nm_streq0(value, "yes")) {
nm_setting_vpn_add_data_item(s_vpn, NM_L2TP_KEY_USER_AUTH_TYPE, NM_L2TP_AUTHTYPE_TLS);
value = nm_setting_vpn_get_data_item(s_vpn, KDE_PLASMA_L2TP_KEY_CERT_CA);
nm_setting_vpn_add_data_item(s_vpn, NM_L2TP_KEY_USER_CA, value);
value = nm_setting_vpn_get_data_item(s_vpn, KDE_PLASMA_L2TP_KEY_CERT_PUB);
nm_setting_vpn_add_data_item(s_vpn, NM_L2TP_KEY_USER_CERT, value);
value = nm_setting_vpn_get_data_item(s_vpn, KDE_PLASMA_L2TP_KEY_CERT_KEY);
nm_setting_vpn_add_data_item(s_vpn, NM_L2TP_KEY_USER_KEY, value);
}
priv->user_authtype = PASSWORD_AUTH;
priv->machine_authtype = PSK_AUTH;
value = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_USER_AUTH_TYPE);
if (nm_streq0(value, NM_L2TP_AUTHTYPE_TLS)) {
priv->user_authtype = TLS_AUTH;
}
/**
* IPsec
**/
value = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_IPSEC_ENABLE);
if (nm_streq0(value, "yes")) {
value = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_MACHINE_AUTH_TYPE);
if (nm_streq0(value, NM_L2TP_AUTHTYPE_TLS)) {
priv->machine_authtype = TLS_AUTH;
tls_key_filename = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_MACHINE_KEY);
tls_cert_filename = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_MACHINE_CERT);
tls_ca_filename = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_MACHINE_CA);
}
if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_STRONGSWAN
|| priv->machine_authtype == PSK_AUTH) {
/**
* IPsec secrets
**/
ipsec_secrets_file = NM_IPSEC_SECRETS; /* typically /etc/ipsec.secrets */
ipsec_conf_dir = NM_IPSEC_SECRETS_DIR; /* typically /etc/ipsec.d */
if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_STRONGSWAN) {
if (g_file_test("/etc/strongswan", G_FILE_TEST_IS_DIR)) {
/* Fedora uses /etc/strongswan/ instead of /etc/ipsec/ */
ipsec_secrets_file = "/etc/strongswan/ipsec.secrets";
ipsec_conf_dir = "/etc/strongswan/ipsec.d";
}
/* if /etc/ipsec.secrets does not have "include ipsec.d/ipsec.nm-l2tp.secrets", add it */
if (g_file_test(ipsec_secrets_file, G_FILE_TEST_EXISTS)) {
if (!has_include_ipsec_secrets(ipsec_secrets_file)) {
fd = open(ipsec_secrets_file, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
if (fd == -1) {
errsv = errno;
snprintf(errorbuf,
sizeof(errorbuf),
_("Could not open %s for writing: %s"),
ipsec_secrets_file,
g_strerror(errsv));
return nm_l2tp_ipsec_error(error, errorbuf);
}
fp = fdopen(fd, "a");
if (fp == NULL) {
snprintf(errorbuf,
sizeof(errorbuf),
_("Could not append \"include ipsec.d/ipsec.nm-l2tp.secrets\" "
"to %s"),
ipsec_secrets_file);
return nm_l2tp_ipsec_error(error, errorbuf);
}
fprintf(fp, "\n\ninclude ipsec.d/ipsec.nm-l2tp.secrets\n");
fclose(fp);
close(fd);
}
}
}
filename = g_strdup_printf("%s/ipsec.nm-l2tp.secrets", ipsec_conf_dir);
fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
g_free(filename);
if (fd == -1) {
snprintf(errorbuf,
sizeof(errorbuf),
_("Could not write %s/ipsec.nm-l2tp.secrets"),
ipsec_conf_dir);
return nm_l2tp_ipsec_error(error, errorbuf);
}
if (priv->machine_authtype == PSK_AUTH) {
value = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_IPSEC_REMOTE_ID);
if (value) {
if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_LIBRESWAN) {
write_config_option(fd, "%%any ");
}
/* Only literal strings starting with @ and IP addresses
are allowed as IDs with IKEv1 PSK */
if (value[0] == '@') {
write_config_option(fd, "%s ", value);
} else if (inet_pton(AF_INET, value, &naddr)) {
write_config_option(fd, "%s ", value);
} else {
write_config_option(fd, "%%any ");
}
}
value = nm_setting_vpn_get_secret_or_legacy_data_item(s_vpn, NM_L2TP_KEY_IPSEC_PSK);
if (!value)
value = "";
if (g_str_has_prefix(value, "0s")) {
write_config_option(fd, ": PSK %s\n", value);
} else {
pwd_base64 = g_base64_encode((const unsigned char *) value, strlen(value));
write_config_option(fd, ": PSK 0s%s\n", pwd_base64);
}
} else { /* TLS_AUTH */
if (!tls_key_filename) {
close(fd);
return nm_l2tp_ipsec_error(error, _("Machine private key file not supplied"));
}
tls_key_fileformat =
crypto_file_format(tls_key_filename, &tls_need_password, &config_error);
if (config_error) {
close(fd);
g_propagate_error(error, config_error);
return FALSE;
}
switch (tls_key_fileformat) {
case NM_L2TP_CRYPTO_FILE_FORMAT_PKCS12:
write_config_option(fd, ": P12");
break;
case NM_L2TP_CRYPTO_FILE_FORMAT_PKCS8_DER:
case NM_L2TP_CRYPTO_FILE_FORMAT_PKCS8_PEM:
write_config_option(fd, ": PKCS8");
break;
default:
write_config_option(fd, ": RSA");
}
write_config_option(fd, " \"%s\"", tls_key_filename);
if (tls_need_password) {
/* password for PKC#12 certificate or private key */
value = nm_setting_vpn_get_secret(s_vpn, NM_L2TP_KEY_MACHINE_CERTPASS);
if (value) {
pwd_base64 = g_base64_encode((const unsigned char *) value, strlen(value));
write_config_option(fd, " 0s%s", pwd_base64);
}
}
write_config_option(fd, "\n");
}
close(fd);
}
/**
* Libreswan NSS database
**/
if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_LIBRESWAN
&& priv->machine_authtype == TLS_AUTH) {
crypto_init_nss(NM_IPSEC_NSS_DIR, &config_error);
if (config_error) {
close(fd);
g_propagate_error(error, config_error);
return FALSE;
}
tls_key_fileformat = crypto_file_format(tls_key_filename, NULL, &config_error);
if (config_error) {
close(fd);
crypto_deinit_nss(NULL);
g_propagate_error(error, config_error);
return FALSE;
}
friendly_name = g_strdup_printf("nm-l2tp-%s", priv->uuid);
if (tls_key_fileformat == NM_L2TP_CRYPTO_FILE_FORMAT_PKCS12) {
p12_array = crypto_decrypt_pkcs12_data(
tls_key_filename,
nm_setting_vpn_get_secret(s_vpn, NM_L2TP_KEY_MACHINE_CERTPASS),
friendly_name,
&config_error);
} else {
p12_array = crypto_create_pkcs12_data(
tls_key_filename,
tls_cert_filename,
tls_ca_filename,
nm_setting_vpn_get_secret(s_vpn, NM_L2TP_KEY_MACHINE_CERTPASS),
friendly_name,
&config_error);
}
if (config_error) {
crypto_deinit_nss(NULL);
g_propagate_error(error, config_error);
return FALSE;
}
crypto_import_nss_pkcs12(p12_array, &config_error);
g_byte_array_free(p12_array, TRUE);
if (config_error) {
crypto_deinit_nss(NULL);
g_propagate_error(error, config_error);
return FALSE;
}
crypto_deinit_nss(NULL);
}
/**
* IPsec config
**/
filename = g_strdup_printf("%s/ipsec.conf", rundir);
fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
g_free(filename);
if (fd == -1) {
return nm_l2tp_ipsec_error(error, _("Could not write ipsec config"));
}
/* IPsec config section */
write_config_option(fd, "config setup\n");
if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_LIBRESWAN) {
if (getenv("PLUTODEBUG")) {
write_config_option(fd, " plutodebug=\"%s\"\n\n", getenv("PLUTODEBUG"));
} else if (_LOGD_enabled()) {
write_config_option(fd, " plutodebug=\"all\"\n\n");
}
} else if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_STRONGSWAN) {
if (getenv("CHARONDEBUG")) {
write_config_option(fd, " charondebug=\"%s\"\n\n", getenv("CHARONDEBUG"));
} else if (_LOGD_enabled()) {
/* Default strongswan debug level is 1 (control), set it to 2 (controlmore) for ike, esp & cfg */
write_config_option(fd, " charondebug=\"ike 2, esp 2, cfg 2\"\n\n");
}
}
/* strongSwan CA section */
if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_STRONGSWAN
&& priv->machine_authtype == TLS_AUTH) {
if (tls_ca_filename) {
tls_ca_fileformat = crypto_file_format(tls_ca_filename, NULL, &config_error);
if (config_error) {
close(fd);
g_propagate_error(error, config_error);
return FALSE;
}
if (tls_ca_fileformat == NM_L2TP_CRYPTO_FILE_FORMAT_X509_DER
|| tls_ca_fileformat == NM_L2TP_CRYPTO_FILE_FORMAT_X509_PEM) {
write_config_option(fd, "ca %s-ca\n", priv->uuid);
write_config_option(fd, " cacert=\"%s\"\n", tls_ca_filename);
write_config_option(fd, " auto=add\n\n", tls_ca_filename);
}
}
}
/* IPsec connection section */
write_config_option(fd, "conn %s\n", priv->uuid);
write_config_option(fd, " auto=add\n");
write_config_option(fd, " type=transport\n");
if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_LIBRESWAN
&& priv->machine_authtype == TLS_AUTH) {
write_config_option(fd, " authby=rsasig\n");
} else if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_STRONGSWAN
&& priv->machine_authtype == TLS_AUTH) {
write_config_option(fd, " authby=pubkey\n");
} else {
write_config_option(fd, " authby=secret\n");
}
if (priv->slocaladdr) {
write_config_option(fd, " left=%s\n", priv->slocaladdr);
} else {
write_config_option(fd, " left=%%defaultroute\n");
}
if (!use_ephemeral_port) {
write_config_option(fd, " leftprotoport=udp/l2tp\n");
}
if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_LIBRESWAN
&& priv->machine_authtype == TLS_AUTH) {
write_config_option(fd, " leftcert=%s\n", friendly_name);
write_config_option(fd, " leftrsasigkey=%%cert\n");
} else if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_STRONGSWAN
&& priv->machine_authtype == TLS_AUTH) {
if (tls_key_fileformat == NM_L2TP_CRYPTO_FILE_FORMAT_PKCS12) {
crypto_pkcs12_get_subject_name(
tls_key_filename,
(const char *) nm_setting_vpn_get_secret(s_vpn, NM_L2TP_KEY_MACHINE_CERTPASS),
&subject_name_str,
&subject_name_asn1,
&config_error);
if (config_error) {
close(fd);
g_propagate_error(error, config_error);
return FALSE;
}
write_config_option(fd, " #leftid=\"%s\"\n", subject_name_str->str);
write_config_option(fd, " leftid=\"asn1dn:#");
for (size_t i = 0; i < subject_name_asn1->len; i++)
write_config_option(fd, "%02x", subject_name_asn1->data[i]);
write_config_option(fd, "\"\n");
g_string_free(subject_name_str, TRUE);
g_byte_array_free(subject_name_asn1, TRUE);
} else {
if (!tls_key_filename) {
close(fd);
return nm_l2tp_ipsec_error(error, _("Machine certificate file not supplied"));
}
write_config_option(fd, " leftcert=\"%s\"\n", tls_cert_filename);
}
}
write_config_option(fd, " rightprotoport=udp/l2tp\n");
write_config_option(fd, " right=%s\n", priv->saddr);
value = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_IPSEC_REMOTE_ID);
if (value) {
write_config_option(fd, " rightid=%s\n", value);
} else {
write_config_option(fd, " rightid=%%any\n");
}
if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_LIBRESWAN
&& priv->machine_authtype == TLS_AUTH) {
write_config_option(fd, " rightrsasigkey=%%cert\n");
}
write_config_option(fd, " keyingtries=%%forever\n");
use_ikev2 = FALSE;
value = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_IPSEC_IKEV2);
if (nm_streq0(value, "yes")) {
use_ikev2 = TRUE;
}
value = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_IPSEC_IKE);
if (value) {
write_config_option(fd, " ike=%s\n", value);
} else if (!use_ikev2) {
if (priv->ipsec_daemon == NM_L2TP_IPSEC_DAEMON_LIBRESWAN) {
write_config_option(fd, " ike=%s\n", LIBRESWAN_IKEV1_ALGORITHMS_PHASE1);
} else {
write_config_option(fd, " ike=%s\n", STRONGSWAN_IKEV1_ALGORITHMS_PHASE1);
}
}
value = nm_setting_vpn_get_data_item(s_vpn, NM_L2TP_KEY_IPSEC_ESP);
if (value) {
write_config_option(fd, " esp=%s\n", value);
} else if (!use_ikev2) {