wip

Makefile.am

@@ -232,6 +232,7 @@ libfreeswitch_la_SOURCES = \
 	src/switch_core_memory.c \
 	src/switch_core_codec.c \
 	src/switch_core_file.c \
+	src/switch_core_cert.c \
 	src/switch_core_hash.c \
 	src/switch_core_sqldb.c \
 	src/switch_core_session.c \

configure.in

@@ -76,6 +76,11 @@ AC_ARG_WITH([grammardir],
 AC_SUBST(grammardir)
 AC_DEFINE_UNQUOTED([SWITCH_GRAMMAR_DIR],"${grammardir}",[where to put grammar files])
 
+AC_ARG_WITH([certsdir],
+	[AS_HELP_STRING([--with-certsdir=DIR], [Put certs files into this location (default: $prefix/certs)])], [certsdir="$withval"], [certsdir="$prefix/certs"])
+AC_SUBST(certsdir)
+AC_DEFINE_UNQUOTED([SWITCH_CERTS_DIR],"${certsdir}",[where to put certs files])
+
 AC_ARG_WITH([scriptdir],
 	[AS_HELP_STRING([--with-scriptdir=DIR], [Put script files into this location (default: $prefix/scripts)])], [scriptdir="$withval"], [scriptdir="$prefix/scripts"])
 AC_SUBST(scriptdir)

src/include/switch_core.h

@@ -40,6 +40,12 @@
 #define SWITCH_CORE_H
 
 #include <switch.h>
+#include <openssl/pem.h>
+#include <openssl/conf.h>
+#include <openssl/x509v3.h>
+#ifndef OPENSSL_NO_ENGINE
+#include <openssl/engine.h>
+#endif
 
 SWITCH_BEGIN_EXTERN_C
 #define SWITCH_MAX_CORE_THREAD_SESSION_OBJS 128
@@ -77,6 +83,37 @@ typedef struct switch_thread_data_s {
 } switch_thread_data_t;
 
 
+#define DTLS_SRTP_FNAME "dtls-srtp"
+#define MAX_FPLEN 64
+#define MAX_FPSTRLEN 192
+
+typedef struct dtls_fp_s { 
+	uint32_t len;
+	uint8_t data[MAX_FPLEN+1];
+	char *type;
+	char str[MAX_FPSTRLEN];
+} dtls_fingerprint_t;
+
+typedef enum {
+	DTLS_TYPE_CLIENT = (1 << 0),
+	DTLS_TYPE_SERVER = (1 << 1),
+	DTLS_TYPE_RTP = (1 << 2),
+	DTLS_TYPE_RTCP = (1 << 3)
+} dtls_type_t;
+
+typedef enum {
+	DS_HANDSHAKE,
+	DS_SETUP,
+	DS_READY,
+	DS_FAIL,
+	DS_INVALID,
+} dtls_state_t;
+
+
+
+
+
+
 #define MESSAGE_STAMP_FFL(_m) _m->_file = __FILE__; _m->_func = __SWITCH_FUNC__; _m->_line = __LINE__
 
 #define MESSAGE_STRING_ARG_MAX 10
@@ -2478,6 +2515,12 @@ SWITCH_DECLARE(void) switch_sql_queue_manger_execute_sql_event_callback(switch_s
 							
 SWITCH_DECLARE(pid_t) switch_fork(void);
 
+SWITCH_DECLARE(int) switch_core_gen_certs(const char *prefix);
+SWITCH_DECLARE(int) switch_core_cert_gen_fingerprint(const char *prefix, dtls_fingerprint_t *fp);
+SWITCH_DECLARE(int) switch_core_cert_expand_fingerprint(dtls_fingerprint_t *fp, const char *str);
+SWITCH_DECLARE(int) switch_core_cert_extract_fingerprint(X509* x509, dtls_fingerprint_t *fp);
+SWITCH_DECLARE(int) switch_core_cert_verify(dtls_fingerprint_t *fp);
+
 SWITCH_END_EXTERN_C
 #endif
 /* For Emacs:

src/include/switch_rtp.h

@@ -96,7 +96,7 @@ typedef struct icand_s {
 #define MAX_CAND 25
 typedef struct ice_s {
 
-	icand_t cands[2][MAX_CAND];
+	icand_t cands[MAX_CAND][2];
 	int cand_idx;
 	int chosen;
 	char *ufrag;
@@ -506,6 +506,9 @@ SWITCH_DECLARE(switch_rtp_stats_t *) switch_rtp_get_stats(switch_rtp_t *rtp_sess
 SWITCH_DECLARE(switch_byte_t) switch_rtp_check_auto_adj(switch_rtp_t *rtp_session);
 SWITCH_DECLARE(void) switch_rtp_set_interdigit_delay(switch_rtp_t *rtp_session, uint32_t delay);
 
+SWITCH_DECLARE(switch_status_t) switch_rtp_add_dtls(switch_rtp_t *rtp_session, dtls_fingerprint_t *local_fp, dtls_fingerprint_t *remote_fp, dtls_type_t type);
+
+
 /*!
   \}
 */

src/include/switch_types.h

@@ -486,6 +486,7 @@ struct switch_directories {
 	char *recordings_dir;
 	char *sounds_dir;
 	char *lib_dir;
+	char *certs_dir;
 };
 
 typedef struct switch_directories switch_directories;
@@ -1297,6 +1298,7 @@ typedef enum {
 	CF_RTP_NOTIMER_DURING_BRIDGE,
 	CF_WEBRTC,
 	CF_ICE,
+	CF_DTLS,
 	/* WARNING: DO NOT ADD ANY FLAGS BELOW THIS LINE */
 	/* IF YOU ADD NEW ONES CHECK IF THEY SHOULD PERSIST OR ZERO THEM IN switch_core_session.c switch_core_session_request_xml() */
 	CF_FLAG_MAX

src/switch_core.c

@@ -711,6 +711,17 @@ SWITCH_DECLARE(void) switch_core_set_globals(void)
 #endif
 	}
 
+	if (!SWITCH_GLOBAL_dirs.certs_dir && (SWITCH_GLOBAL_dirs.certs_dir = (char *) malloc(BUFSIZE))) {
+		if (SWITCH_GLOBAL_dirs.base_dir)
+			switch_snprintf(SWITCH_GLOBAL_dirs.certs_dir, BUFSIZE, "%s%scert", SWITCH_GLOBAL_dirs.base_dir, SWITCH_PATH_SEPARATOR);
+		else
+#ifdef SWITCH_CERTS_DIR
+			switch_snprintf(SWITCH_GLOBAL_dirs.certs_dir, BUFSIZE, "%s", SWITCH_CERTS_DIR);
+#else
+			switch_snprintf(SWITCH_GLOBAL_dirs.certs_dir, BUFSIZE, "%s%scert", base_dir, SWITCH_PATH_SEPARATOR);
+#endif
+	}
+
 	if (!SWITCH_GLOBAL_dirs.temp_dir && (SWITCH_GLOBAL_dirs.temp_dir = (char *) malloc(BUFSIZE))) {
 #ifdef SWITCH_TEMP_DIR
 		switch_snprintf(SWITCH_GLOBAL_dirs.temp_dir, BUFSIZE, "%s", SWITCH_TEMP_DIR);
@@ -745,6 +756,7 @@ SWITCH_DECLARE(void) switch_core_set_globals(void)
 	switch_assert(SWITCH_GLOBAL_dirs.grammar_dir);
 	switch_assert(SWITCH_GLOBAL_dirs.recordings_dir);
 	switch_assert(SWITCH_GLOBAL_dirs.sounds_dir);
+	switch_assert(SWITCH_GLOBAL_dirs.certs_dir);
 	switch_assert(SWITCH_GLOBAL_dirs.temp_dir);
 }
 
@@ -1593,7 +1605,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_init(switch_core_flag_t flags, switc
 	switch_dir_make_recursive(SWITCH_GLOBAL_dirs.recordings_dir, SWITCH_DEFAULT_DIR_PERMS, runtime.memory_pool);
 	switch_dir_make_recursive(SWITCH_GLOBAL_dirs.sounds_dir, SWITCH_DEFAULT_DIR_PERMS, runtime.memory_pool);
 	switch_dir_make_recursive(SWITCH_GLOBAL_dirs.temp_dir, SWITCH_DEFAULT_DIR_PERMS, runtime.memory_pool);
-
+	switch_dir_make_recursive(SWITCH_GLOBAL_dirs.certs_dir, SWITCH_DEFAULT_DIR_PERMS, runtime.memory_pool);
 
 	switch_mutex_init(&runtime.uuid_mutex, SWITCH_MUTEX_NESTED, runtime.memory_pool);
 

src/switch_core_media.c

@@ -137,6 +137,10 @@ typedef struct switch_rtp_engine_s {
 
 	int8_t rtcp_mux;
 
+	dtls_fingerprint_t local_dtls_fingerprint;
+	dtls_fingerprint_t remote_dtls_fingerprint;
+
+
 } switch_rtp_engine_t;
 
 
@@ -742,7 +746,7 @@ SWITCH_DECLARE(void) switch_core_session_apply_crypto(switch_core_session_t *ses
 	engine = &session->media_handle->engines[type];
 
 	
-	if (engine->ssec.remote_crypto_key && switch_channel_test_flag(session->channel, CF_SECURE)) {
+	if (engine->ssec.remote_crypto_key && switch_channel_test_flag(session->channel, CF_SECURE) && !switch_channel_test_flag(session->channel, CF_DTLS)) {
 		switch_core_media_add_crypto(&engine->ssec, engine->ssec.remote_crypto_key, SWITCH_RTP_CRYPTO_RECV);
 
 		
@@ -801,7 +805,8 @@ SWITCH_DECLARE(int) switch_core_session_check_incoming_crypto(switch_core_sessio
 				switch_channel_set_variable(session->channel, "srtp_remote_audio_crypto_key", crypto);
 				engine->ssec.crypto_tag = crypto_tag;
 								
-				if (switch_rtp_ready(engine->rtp_session) && switch_channel_test_flag(session->channel, CF_SECURE)) {
+				if (switch_rtp_ready(engine->rtp_session) && switch_channel_test_flag(session->channel, CF_SECURE) && 
+					!switch_channel_test_flag(session->channel, CF_DTLS)) {
 					switch_core_media_add_crypto(&engine->ssec, engine->ssec.remote_crypto_key, SWITCH_RTP_CRYPTO_RECV);
 					switch_rtp_add_crypto_key(engine->rtp_session, SWITCH_RTP_CRYPTO_RECV, engine->ssec.crypto_tag,
 											  engine->ssec.crypto_type, engine->ssec.remote_raw_key, SWITCH_RTP_KEY_LEN);
@@ -840,7 +845,7 @@ SWITCH_DECLARE(void) switch_core_session_check_outgoing_crypto(switch_core_sessi
 	switch_channel_t *channel = switch_core_session_get_channel(session);
 	const char *var;
 
-	if (!switch_core_session_media_handle_ready(session) == SWITCH_STATUS_SUCCESS) {
+	if (!switch_core_session_media_handle_ready(session) == SWITCH_STATUS_SUCCESS || switch_channel_test_flag(channel, CF_DTLS)) {
 		return;
 	}
 	
@@ -1771,6 +1776,21 @@ SWITCH_DECLARE(void) switch_core_media_check_video_codecs(switch_core_session_t
 	}
 }
 
+//?
+static void generate_local_fingerprint(switch_media_handle_t *smh, switch_media_type_t type)
+{
+	switch_rtp_engine_t *engine = &smh->engines[type];
+
+	engine->local_dtls_fingerprint.type = "sha-256";
+	switch_core_cert_gen_fingerprint(DTLS_SRTP_FNAME, &engine->local_dtls_fingerprint);
+
+	
+	//engine->local_dtls_fingerprint.data[];
+	
+	
+}
+
+
 //?
 static void check_ice(switch_media_handle_t *smh, switch_media_type_t type, sdp_media_t *m)
 {
@@ -1799,6 +1819,28 @@ static void check_ice(switch_media_handle_t *smh, switch_media_type_t type, sdp_
 			engine->ice_in.pwd = switch_core_session_strdup(smh->session, attr->a_value);
 		} else if (!strcasecmp(attr->a_name, "ice-options")) {
 			engine->ice_in.options = switch_core_session_strdup(smh->session, attr->a_value);
+		} else if (!strcasecmp(attr->a_name, "fingerprint") && !zstr(attr->a_value)) {
+			//a=fingerprint:sha-256 B6:14:E2:59:58:C9:DD:44:50:91:D4:75:AE:23:9F:67:9F:8E:C2:B3:36:62:C7:9C:F4:25:1F:F3:EF:58:B1:BF
+
+			char *p;
+
+			engine->remote_dtls_fingerprint.type = switch_core_session_strdup(smh->session, attr->a_value);
+			
+			if ((p = strchr(engine->remote_dtls_fingerprint.type, ' '))) {
+				*p++ = '\0';
+				switch_set_string(engine->local_dtls_fingerprint.str, p);
+			}
+			
+			if (strcasecmp(engine->remote_dtls_fingerprint.type, "sha-256")) {
+				switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(smh->session), SWITCH_LOG_WARNING, "Unsupported fingerprint type.\n");
+				engine->local_dtls_fingerprint.type = NULL;
+				engine->remote_dtls_fingerprint.type = NULL;
+			}
+			
+			generate_local_fingerprint(smh, type);
+
+			switch_channel_set_flag(smh->session->channel, CF_DTLS);
+
 #ifdef RTCP_MUX
 		} else if (!strcasecmp(attr->a_name, "rtcp-mux")) {
 
@@ -3652,6 +3694,16 @@ SWITCH_DECLARE(switch_status_t) switch_core_media_activate_rtp(switch_core_sessi
 		}
 
 
+		if (!zstr(a_engine->local_dtls_fingerprint.str)) {
+			dtls_type_t dtype = switch_channel_direction(smh->session->channel) == SWITCH_CALL_DIRECTION_INBOUND ? DTLS_TYPE_SERVER : DTLS_TYPE_CLIENT;
+
+			dtype |= DTLS_TYPE_RTP;
+			if (a_engine->rtcp_mux > 0) dtype |= DTLS_TYPE_RTCP;
+		
+			switch_rtp_add_dtls(a_engine->rtp_session, &a_engine->local_dtls_fingerprint, &a_engine->remote_dtls_fingerprint, dtype);
+		}
+
+
 		if (a_engine->ice_in.cands[a_engine->ice_in.chosen][0].ready) {
 			
 			gen_ice(session, SWITCH_MEDIA_TYPE_AUDIO, NULL, 0);
@@ -4756,8 +4808,11 @@ SWITCH_DECLARE(void) switch_core_media_gen_local_sdp(switch_core_session_t *sess
 		}
 	
 
-
-
+		if (!zstr(a_engine->local_dtls_fingerprint.type)) {
+			switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=fingerprint:%s %s\n", a_engine->local_dtls_fingerprint.type, 
+							a_engine->local_dtls_fingerprint.str);
+		}
+		
 		if (smh->mparams->rtcp_audio_interval_msec) {
 			if (a_engine->rtcp_mux > 0) {
 				switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=rtcp-mux\n");
@@ -4837,7 +4892,7 @@ SWITCH_DECLARE(void) switch_core_media_gen_local_sdp(switch_core_session_t *sess
 
 
 
-		if (!zstr(local_audio_crypto_key) && switch_channel_test_flag(session->channel, CF_SECURE)) {
+		if (!zstr(local_audio_crypto_key) && switch_channel_test_flag(session->channel, CF_SECURE) && !switch_channel_test_flag(session->channel, CF_DTLS)) {
 			switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=crypto:%s\n", local_audio_crypto_key);
 			//switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=encryption:optional\n");
 		}
@@ -5051,6 +5106,11 @@ SWITCH_DECLARE(void) switch_core_media_gen_local_sdp(switch_core_session_t *sess
 			}
 
 
+			if (!zstr(v_engine->local_dtls_fingerprint.type)) {
+				switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=fingerprint:%s %s\n", v_engine->local_dtls_fingerprint.type, 
+								v_engine->local_dtls_fingerprint.str);
+			}
+
 
 			if (smh->mparams->rtcp_audio_interval_msec) {
 				if (v_engine->rtcp_mux > 0) {
@@ -5130,7 +5190,8 @@ SWITCH_DECLARE(void) switch_core_media_gen_local_sdp(switch_core_session_t *sess
 				
 
 
-			if (switch_channel_test_flag(session->channel, CF_SECURE) && !zstr(local_video_crypto_key)) {
+			if (switch_channel_test_flag(session->channel, CF_SECURE) && !zstr(local_video_crypto_key) && 
+				!switch_channel_test_flag(session->channel, CF_DTLS)) {
 				switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=crypto:%s\n", local_video_crypto_key);
 				//switch_snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "a=encryption:optional\n");
 			}			
@@ -6807,7 +6868,7 @@ SWITCH_DECLARE (void) switch_core_media_recover_session(switch_core_session_t *s
 
 SWITCH_DECLARE(void) switch_core_media_init(void)
 {
-	
+	switch_core_gen_certs(DTLS_SRTP_FNAME);	
 }
 
 SWITCH_DECLARE(void) switch_core_media_deinit(void)