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tls_mod.c
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tls_mod.c
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/*
* TLS module
*
* Copyright (C) 2007 iptelorg GmbH
* Copyright (C) Motorola Solutions, Inc.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/** Kamailio TLS support :: Module interface.
* @file
* @ingroup tls
* Module: @ref tls
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include "../../core/locking.h"
#include "../../core/sr_module.h"
#include "../../core/ip_addr.h"
#include "../../core/trim.h"
#include "../../core/globals.h"
#include "../../core/timer_ticks.h"
#include "../../core/timer.h" /* ticks_t */
#include "../../core/tls_hooks.h"
#include "../../core/ut.h"
#include "../../core/shm_init.h"
#include "../../core/rpc_lookup.h"
#include "../../core/cfg/cfg.h"
#include "../../core/dprint.h"
#include "../../core/kemi.h"
#include "tls_init.h"
#include "tls_server.h"
#include "tls_domain.h"
#include "tls_select.h"
#include "tls_config.h"
#include "tls_rpc.h"
#include "tls_util.h"
#include "tls_mod.h"
#include "tls_cfg.h"
#include "tls_rand.h"
#ifndef TLS_HOOKS
#error "TLS_HOOKS must be defined, or the tls module won't work"
#endif
#ifdef CORE_TLS
#error "conflict: CORE_TLS must _not_ be defined"
#endif
/*
* FIXME:
* - How do we ask for secret key password ? Mod_init is called after
* daemonize and thus has no console access
* - forward_tls and t_relay_to_tls should be here
* add tls_log
* - Currently it is not possible to reset certificate in a domain,
* for example if you specify client certificate in the default client
* domain then there is no way to define another client domain which would
* have no client certificate configured
*/
/*
* Module management function prototypes
*/
static int mod_init(void);
static int mod_child(int rank);
static void destroy(void);
static int w_is_peer_verified(struct sip_msg* msg, char* p1, char* p2);
int ksr_rand_engine_param(modparam_t type, void* val);
MODULE_VERSION
extern str sr_tls_event_callback;
str sr_tls_xavp_cfg = {0, 0};
/*
* Default settings when modparams are used
*/
static tls_domain_t mod_params = {
TLS_DOMAIN_DEF | TLS_DOMAIN_SRV, /* Domain Type */
{}, /* IP address */
0, /* Port number */
0, /* SSL ctx */
STR_STATIC_INIT(TLS_CERT_FILE), /* Certificate file */
STR_STATIC_INIT(TLS_PKEY_FILE), /* Private key file */
0, /* Verify certificate */
9, /* Verify depth */
STR_STATIC_INIT(TLS_CA_FILE), /* CA file */
STR_STATIC_INIT(TLS_CA_PATH), /* CA path */
0, /* Require certificate */
{0, 0}, /* Cipher list */
TLS_USE_TLSv1_PLUS, /* TLS method */
STR_STATIC_INIT(TLS_CRL_FILE), /* Certificate revocation list */
{0, 0}, /* Server name (SNI) */
0, /* Server name (SNI) mode */
{0, 0}, /* Server id */
TLS_VERIFY_CLIENT_OFF, /* Verify client */
0 /* next */
};
/*
* Default settings for server domains when using external config file
*/
tls_domain_t srv_defaults = {
TLS_DOMAIN_DEF | TLS_DOMAIN_SRV, /* Domain Type */
{}, /* IP address */
0, /* Port number */
0, /* SSL ctx */
STR_STATIC_INIT(TLS_CERT_FILE), /* Certificate file */
STR_STATIC_INIT(TLS_PKEY_FILE), /* Private key file */
0, /* Verify certificate */
9, /* Verify depth */
STR_STATIC_INIT(TLS_CA_FILE), /* CA file */
STR_STATIC_INIT(TLS_CA_PATH), /* CA path */
0, /* Require certificate */
{0, 0}, /* Cipher list */
TLS_USE_TLSv1_PLUS, /* TLS method */
STR_STATIC_INIT(TLS_CRL_FILE), /* Certificate revocation list */
{0, 0}, /* Server name (SNI) */
0, /* Server name (SNI) mode */
{0, 0}, /* Server id */
TLS_VERIFY_CLIENT_OFF, /* Verify client */
0 /* next */
};
#ifndef OPENSSL_NO_ENGINE
typedef struct tls_engine {
str engine;
str engine_config;
str engine_algorithms;
} tls_engine_t;
#include <openssl/conf.h>
#include <openssl/engine.h>
static ENGINE *ksr_tls_engine;
static tls_engine_t tls_engine_settings = {
STR_STATIC_INIT("NONE"),
STR_STATIC_INIT("NONE"),
STR_STATIC_INIT("ALL"),
};
#endif /* OPENSSL_NO_ENGINE */
/*
* Default settings for client domains when using external config file
*/
tls_domain_t cli_defaults = {
TLS_DOMAIN_DEF | TLS_DOMAIN_CLI, /* Domain Type */
{}, /* IP address */
0, /* Port number */
0, /* SSL ctx */
{0, 0}, /* Certificate file */
{0, 0}, /* Private key file */
0, /* Verify certificate */
9, /* Verify depth */
STR_STATIC_INIT(TLS_CA_FILE), /* CA file */
STR_STATIC_INIT(TLS_CA_PATH), /* CA path */
0, /* Require certificate */
{0, 0}, /* Cipher list */
TLS_USE_TLSv1_PLUS, /* TLS method */
{0, 0}, /* Certificate revocation list */
{0, 0}, /* Server name (SNI) */
0, /* Server name (SNI) mode */
{0, 0}, /* Server id */
TLS_VERIFY_CLIENT_OFF, /* Verify client */
0 /* next */
};
/* Current TLS configuration */
tls_domains_cfg_t** tls_domains_cfg = NULL;
/* List lock, used by garbage collector */
gen_lock_t* tls_domains_cfg_lock = NULL;
int sr_tls_renegotiation = 0;
/*
* Exported functions
*/
static cmd_export_t cmds[] = {
{"is_peer_verified", (cmd_function)w_is_peer_verified, 0, 0, 0,
REQUEST_ROUTE},
{0,0,0,0,0,0}
};
/*
* Exported parameters
*/
static param_export_t params[] = {
{"tls_method", PARAM_STR, &default_tls_cfg.method },
{"server_name", PARAM_STR, &default_tls_cfg.server_name },
{"verify_certificate", PARAM_INT, &default_tls_cfg.verify_cert },
{"verify_depth", PARAM_INT, &default_tls_cfg.verify_depth },
{"require_certificate", PARAM_INT, &default_tls_cfg.require_cert },
{"verify_client", PARAM_STR, &default_tls_cfg.verify_client},
{"private_key", PARAM_STR, &default_tls_cfg.private_key },
{"ca_list", PARAM_STR, &default_tls_cfg.ca_list },
{"ca_path", PARAM_STR, &default_tls_cfg.ca_path },
{"certificate", PARAM_STR, &default_tls_cfg.certificate },
{"crl", PARAM_STR, &default_tls_cfg.crl },
{"cipher_list", PARAM_STR, &default_tls_cfg.cipher_list },
{"connection_timeout", PARAM_INT, &default_tls_cfg.con_lifetime },
#ifndef OPENSSL_NO_ENGINE
{"engine", PARAM_STR, &tls_engine_settings.engine },
{"engine_config", PARAM_STR, &tls_engine_settings.engine_config },
{"engine_algorithms", PARAM_STR, &tls_engine_settings.engine_algorithms },
#endif /* OPENSSL_NO_ENGINE */
{"tls_log", PARAM_INT, &default_tls_cfg.log },
{"tls_debug", PARAM_INT, &default_tls_cfg.debug },
{"session_cache", PARAM_INT, &default_tls_cfg.session_cache},
{"session_id", PARAM_STR, &default_tls_cfg.session_id },
{"config", PARAM_STR, &default_tls_cfg.config_file },
{"tls_disable_compression", PARAM_INT,
&default_tls_cfg.disable_compression},
{"ssl_release_buffers", PARAM_INT, &default_tls_cfg.ssl_release_buffers},
{"ssl_freelist_max_len", PARAM_INT, &default_tls_cfg.ssl_freelist_max},
{"ssl_max_send_fragment", PARAM_INT,
&default_tls_cfg.ssl_max_send_fragment},
{"ssl_read_ahead", PARAM_INT, &default_tls_cfg.ssl_read_ahead},
{"send_close_notify", PARAM_INT, &default_tls_cfg.send_close_notify},
{"con_ct_wq_max", PARAM_INT, &default_tls_cfg.con_ct_wq_max},
{"ct_wq_max", PARAM_INT, &default_tls_cfg.ct_wq_max},
{"ct_wq_blk_size", PARAM_INT, &default_tls_cfg.ct_wq_blk_size},
{"tls_force_run", PARAM_INT, &default_tls_cfg.force_run},
{"low_mem_threshold1", PARAM_INT, &default_tls_cfg.low_mem_threshold1},
{"low_mem_threshold2", PARAM_INT, &default_tls_cfg.low_mem_threshold2},
{"renegotiation", PARAM_INT, &sr_tls_renegotiation},
{"xavp_cfg", PARAM_STR, &sr_tls_xavp_cfg},
{"event_callback", PARAM_STR, &sr_tls_event_callback},
{"rand_engine", PARAM_STR|USE_FUNC_PARAM, (void*)ksr_rand_engine_param},
{0, 0, 0}
};
/*
* Module interface
*/
struct module_exports exports = {
"tls", /* module name */
DEFAULT_DLFLAGS, /* dlopen flags */
cmds, /* exported functions */
params, /* exported parameters */
0, /* exported rpc command */
tls_pv, /* exported pseudo-variables */
0, /* response handling function */
mod_init, /* module init function */
mod_child, /* child initi function */
destroy /* destroy function */
};
static struct tls_hooks tls_h = {
tls_h_read_f,
tls_h_encode_f,
tls_h_tcpconn_init_f,
tls_h_tcpconn_clean_f,
tls_h_tcpconn_close_f,
tls_h_init_si_f,
tls_h_mod_init_f,
tls_h_mod_destroy_f,
tls_h_mod_pre_init_f,
};
#if 0
/*
* Create TLS configuration from modparams
*/
static tls_domains_cfg_t* tls_use_modparams(void)
{
tls_domains_cfg_t* ret;
ret = tls_new_cfg();
if (!ret) return;
}
#endif
static int mod_init(void)
{
int method;
int verify_client;
if (tls_disable){
LM_WARN("tls support is disabled "
"(set enable_tls=1 in the config to enable it)\n");
return 0;
}
if (fix_tls_cfg(&default_tls_cfg) < 0 ) {
LM_ERR("initial tls configuration fixup failed\n");
return -1;
}
/* declare configuration */
if (cfg_declare("tls", tls_cfg_def, &default_tls_cfg,
cfg_sizeof(tls), (void **)&tls_cfg)) {
LM_ERR("failed to register the configuration\n");
return -1;
}
/* Convert tls_method parameter to integer */
method = tls_parse_method(&cfg_get(tls, tls_cfg, method));
if (method < 0) {
LM_ERR("Invalid tls_method parameter value\n");
return -1;
}
/* fill mod_params */
mod_params.method = method;
mod_params.verify_cert = cfg_get(tls, tls_cfg, verify_cert);
mod_params.verify_depth = cfg_get(tls, tls_cfg, verify_depth);
mod_params.require_cert = cfg_get(tls, tls_cfg, require_cert);
mod_params.pkey_file = cfg_get(tls, tls_cfg, private_key);
mod_params.ca_file = cfg_get(tls, tls_cfg, ca_list);
mod_params.crl_file = cfg_get(tls, tls_cfg, crl);
mod_params.cert_file = cfg_get(tls, tls_cfg, certificate);
mod_params.cipher_list = cfg_get(tls, tls_cfg, cipher_list);
mod_params.server_name = cfg_get(tls, tls_cfg, server_name);
/* Convert verify_client parameter to integer */
verify_client = tls_parse_verify_client(&cfg_get(tls, tls_cfg, verify_client));
if (verify_client < 0) {
LM_ERR("Invalid tls_method parameter value\n");
return -1;
}
mod_params.verify_client = verify_client;
tls_domains_cfg =
(tls_domains_cfg_t**)shm_malloc(sizeof(tls_domains_cfg_t*));
if (!tls_domains_cfg) {
LM_ERR("Not enough shared memory left\n");
goto error;
}
*tls_domains_cfg = NULL;
register_select_table(tls_sel);
/* register the rpc interface */
if (rpc_register_array(tls_rpc)!=0) {
LM_ERR("failed to register RPC commands\n");
goto error;
}
/* if (init_tls() < 0) return -1; */
tls_domains_cfg_lock = lock_alloc();
if (tls_domains_cfg_lock == 0) {
LM_ERR("Unable to create TLS configuration lock\n");
goto error;
}
if (lock_init(tls_domains_cfg_lock) == 0) {
lock_dealloc(tls_domains_cfg_lock);
ERR("Unable to initialize TLS configuration lock\n");
goto error;
}
if (tls_ct_wq_init() < 0) {
LM_ERR("Unable to initialize TLS buffering\n");
goto error;
}
if (cfg_get(tls, tls_cfg, config_file).s) {
*tls_domains_cfg =
tls_load_config(&cfg_get(tls, tls_cfg, config_file));
if (!(*tls_domains_cfg)) goto error;
} else {
*tls_domains_cfg = tls_new_cfg();
if (!(*tls_domains_cfg)) goto error;
}
if (tls_check_sockets(*tls_domains_cfg) < 0)
goto error;
LM_INFO("use OpenSSL version: %08x\n", (uint32_t)(OPENSSL_VERSION_NUMBER));
#ifndef OPENSSL_NO_ECDH
LM_INFO("With ECDH-Support!\n");
#endif
#ifndef OPENSSL_NO_DH
LM_INFO("With Diffie Hellman\n");
#endif
if(sr_tls_event_callback.s==NULL || sr_tls_event_callback.len<=0) {
tls_lookup_event_routes();
}
return 0;
error:
tls_h_mod_destroy_f();
return -1;
}
#ifndef OPENSSL_NO_ENGINE
static int tls_engine_init();
int tls_fix_engine_keys(tls_domains_cfg_t*, tls_domain_t*, tls_domain_t*);
#endif
static int mod_child(int rank)
{
if (tls_disable || (tls_domains_cfg==0))
return 0;
/* fix tls config only from the main proc/PROC_INIT., when we know
* the exact process number and before any other process starts*/
if (rank == PROC_INIT){
if (cfg_get(tls, tls_cfg, config_file).s){
if (tls_fix_domains_cfg(*tls_domains_cfg,
&srv_defaults, &cli_defaults) < 0)
return -1;
}else{
if (tls_fix_domains_cfg(*tls_domains_cfg,
&mod_params, &mod_params) < 0)
return -1;
}
}
#ifndef OPENSSL_NO_ENGINE
/*
* after the child is fork()ed we go through the TLS domains
* and fix up private keys from engine
*/
if (!strncmp(tls_engine_settings.engine.s, "NONE", 4)) return 0;
if (rank > 0) {
if (tls_engine_init() < 0)
return -1;
if (tls_fix_engine_keys(*tls_domains_cfg, &srv_defaults, &cli_defaults)<0)
return -1;
LM_INFO("OpenSSL Engine loaded private keys in child: %d\n", rank);
}
#endif
return 0;
}
static void destroy(void)
{
/* tls is destroyed via the registered destroy_tls_h callback
* => nothing to do here */
}
int ksr_rand_engine_param(modparam_t type, void* val)
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
str *reng;
if(val==NULL) {
return -1;
}
reng = (str*)val;
LM_DBG("random engine: %.*s\n", reng->len, reng->s);
if(reng->len == 5 && strncasecmp(reng->s, "krand", 5) == 0) {
LM_DBG("setting krand random engine\n");
RAND_set_rand_method(RAND_ksr_krand_method());
} else if(reng->len == 8 && strncasecmp(reng->s, "fastrand", 8) == 0) {
LM_DBG("setting fastrand random engine\n");
RAND_set_rand_method(RAND_ksr_fastrand_method());
} else if (reng->len == 10 && strncasecmp(reng->s, "cryptorand", 10) == 0) {
LM_DBG("setting cryptorand random engine\n");
RAND_set_rand_method(RAND_ksr_cryptorand_method());
} else if (reng->len == 8 && strncasecmp(reng->s, "kxlibssl", 8) == 0) {
LM_DBG("setting kxlibssl random engine\n");
RAND_set_rand_method(RAND_ksr_kxlibssl_method());
}
#endif
return 0;
}
static int ki_is_peer_verified(sip_msg_t* msg)
{
struct tcp_connection *c;
SSL *ssl;
long ssl_verify;
X509 *x509_cert;
LM_DBG("started...\n");
if (msg->rcv.proto != PROTO_TLS) {
LM_ERR("proto != TLS --> peer can't be verified, return -1\n");
return -1;
}
LM_DBG("trying to find TCP connection of received message...\n");
c = tcpconn_get(msg->rcv.proto_reserved1, 0, 0, 0,
cfg_get(tls, tls_cfg, con_lifetime));
if (!c) {
LM_ERR("connection no longer exists\n");
return -1;
}
if(c->type != PROTO_TLS) {
LM_ERR("Connection found but is not TLS\n");
tcpconn_put(c);
return -1;
}
if (!c->extra_data) {
LM_ERR("no extra_data specified in TLS/TCP connection found."
" This should not happen... return -1\n");
tcpconn_put(c);
return -1;
}
ssl = ((struct tls_extra_data*)c->extra_data)->ssl;
ssl_verify = SSL_get_verify_result(ssl);
if ( ssl_verify != X509_V_OK ) {
LM_WARN("verification of presented certificate failed... return -1\n");
tcpconn_put(c);
return -1;
}
/* now, we have only valid peer certificates or peers without certificates.
* Thus we have to check for the existence of a peer certificate
*/
x509_cert = SSL_get_peer_certificate(ssl);
if ( x509_cert == NULL ) {
LM_INFO("tlsops:is_peer_verified: WARNING: peer did not present "
"a certificate. Thus it could not be verified... return -1\n");
tcpconn_put(c);
return -1;
}
X509_free(x509_cert);
tcpconn_put(c);
LM_DBG("tlsops:is_peer_verified: peer is successfully verified"
"...done\n");
return 1;
}
static int w_is_peer_verified(struct sip_msg* msg, char* foo, char* foo2)
{
return ki_is_peer_verified(msg);
}
/**
*
*/
static sr_kemi_xval_t* ki_tls_cget(sip_msg_t *msg, str *aname)
{
return ki_tls_cget_attr(msg, aname);
}
/**
*
*/
/* clang-format off */
static sr_kemi_t sr_kemi_tls_exports[] = {
{ str_init("tls"), str_init("is_peer_verified"),
SR_KEMIP_INT, ki_is_peer_verified,
{ SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE,
SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
},
{ str_init("tls"), str_init("cget"),
SR_KEMIP_XVAL, ki_tls_cget,
{ SR_KEMIP_STR, SR_KEMIP_NONE, SR_KEMIP_NONE,
SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
},
{ {0, 0}, {0, 0}, 0, NULL, { 0, 0, 0, 0, 0, 0 } }
};
/* clang-format on */
/**
*
*/
int mod_register(char *path, int *dlflags, void *p1, void *p2)
{
if (tls_disable) {
LM_WARN("tls support is disabled "
"(set enable_tls=1 in the config to enable it)\n");
return 0;
}
/* shm is used, be sure it is initialized */
if(!shm_initialized() && init_shm()<0)
return -1;
if(tls_pre_init()<0)
return -1;
register_tls_hooks(&tls_h);
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
LM_DBG("setting cryptorand random engine\n");
RAND_set_rand_method(RAND_ksr_cryptorand_method());
#endif
sr_kemi_modules_add(sr_kemi_tls_exports);
return 0;
}
#ifndef OPENSSL_NO_ENGINE
/*
* initialize OpenSSL engine in child process
* PKCS#11 libraries are not guaranteed to be fork() safe
*
*/
static int tls_engine_init()
{
LM_DBG("With OpenSSL engine support\n");
if (strncmp(tls_engine_settings.engine.s, "NONE", 4)) {
int err = 0;
ENGINE_load_builtin_engines();
OPENSSL_load_builtin_modules();
if (strncmp(tls_engine_settings.engine_config.s, "NONE", 4)) {
err = CONF_modules_load_file(tls_engine_settings.engine_config.s, "kamailio", 0);
if (!err) {
LM_ERR("OpenSSL failed to load ENGINE configuration file: %*s\n", tls_engine_settings.engine_config.len, tls_engine_settings.engine_config.s);
goto error;
}
}
ksr_tls_engine = ENGINE_by_id(tls_engine_settings.engine.s);
if (!ksr_tls_engine) {
LM_ERR("OpenSSL failed to obtain ENGINE: %*s\n", tls_engine_settings.engine_config.len, tls_engine_settings.engine_config.s);
goto error;
}
err = ENGINE_init(ksr_tls_engine);
if (!err) {
LM_ERR("OpenSSL ENGINE_init() failed\n");
goto error;
}
if (strncmp(tls_engine_settings.engine_algorithms.s, "NONE", 4)) {
err = ENGINE_set_default_string(ksr_tls_engine, tls_engine_settings.engine_algorithms.s);
if (!err) {
LM_ERR("OpenSSL ENGINE could not set algorithms\n");
goto error;
}
}
LM_INFO("OpenSSL engine %*s initialized\n", tls_engine_settings.engine.len, tls_engine_settings.engine.s);
}
return 0;
error:
return -1;
}
EVP_PKEY *tls_engine_private_key(const char* key_id) {
return ENGINE_load_private_key(ksr_tls_engine, key_id, NULL, NULL);
}
#endif