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Add RFC5764 - SRTP key generation during DTLS handshake

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Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
This commit is contained in:
Johan Pascal 2015-12-03 21:56:45 +01:00
parent 935b4f96f9
commit b62bb51aff
5 changed files with 449 additions and 0 deletions
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11
include/mbedtls/config.h
View file

@ -1812,6 +1812,17 @@
*/
#define MBEDTLS_SSL_DTLS_HELLO_VERIFY
/**
* \def MBEDTLS_SSL_DTLS_SRTP
*
* Enable support for DTLS-SRTP, RFC5764
*
* Requires: MBEDTLS_SSL_PROTO_DTLS
*
* Comment this to disable support for DTLS-SRTP.
*/
#define MBEDTLS_SSL_DTLS_SRTP
/**
* \def MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE
*

59
include/mbedtls/ssl.h
View file

@ -393,6 +393,8 @@
#define MBEDTLS_TLS_EXT_SIG_ALG 13
#define MBEDTLS_TLS_EXT_USE_SRTP 14
#define MBEDTLS_TLS_EXT_ALPN 16
#define MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC 22 /* 0x16 */
@ -409,6 +411,14 @@
#define MBEDTLS_TLS_EXT_RENEGOTIATION_INFO 0xFF01
/*
* use_srtp extension protection profiles values as defined in http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml
*/
#define MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80_IANA_VALUE 0x0001
#define MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32_IANA_VALUE 0x0002
#define MBEDTLS_SRTP_NULL_HMAC_SHA1_80_IANA_VALUE 0x0005
#define MBEDTLS_SRTP_NULL_HMAC_SHA1_32_IANA_VALUE 0x0006
/*
* Size defines
*/
@ -851,6 +861,19 @@ typedef void mbedtls_ssl_async_cancel_t( mbedtls_ssl_context *ssl );
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED &&
!MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
/*
* List of SRTP profiles for DTLS-SRTP
*/
enum mbedtls_DTLS_SRTP_protection_profiles {
MBEDTLS_SRTP_UNSET_PROFILE,
MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80,
MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32,
MBEDTLS_SRTP_NULL_HMAC_SHA1_80,
MBEDTLS_SRTP_NULL_HMAC_SHA1_32,
};
#endif /* MBEDTLS_SSL_DTLS_SRTP */
/*
* This structure is used for storing current session data.
*
@ -1298,6 +1321,17 @@ struct mbedtls_ssl_context
const char *alpn_chosen; /*!< negotiated protocol */
#endif /* MBEDTLS_SSL_ALPN */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
/*
* use_srtp extension
*/
enum mbedtls_DTLS_SRTP_protection_profiles *dtls_srtp_profiles_list; /*!< ordered list of supported srtp profile */
size_t dtls_srtp_profiles_list_len; /*!< number of supported profiles */
enum mbedtls_DTLS_SRTP_protection_profiles chosen_dtls_srtp_profile; /*!< negotiated profil */
unsigned char *dtls_srtp_keys; /*<! master keys and master salt for SRTP generated during handshake */
size_t dtls_srtp_keys_len; /*<! length in bytes of master keys and master salt for SRTP generated during handshake */
#endif /* MBEDTLS_SSL_DTLS_SRTP */
/*
* Information for DTLS hello verify
*/
@ -3120,6 +3154,31 @@ int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **prot
const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl );
#endif /* MBEDTLS_SSL_ALPN */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
/**
* \brief Set the supported DTLS-SRTP protection profiles.
*
* \param ssl SSL context
* \param protos List of supported protection profiles,
* in decreasing preference order.
* \param profiles_number Number of supported profiles.
*
* \return 0 on success, or MBEDTLS_ERR_SSL_BAD_INPUT_DATA.
*/
int mbedtls_ssl_set_dtls_srtp_protection_profiles( mbedtls_ssl_context *ssl, const enum mbedtls_DTLS_SRTP_protection_profiles *profiles, size_t profiles_number);
/**
* \brief Get the negotiated DTLS-SRTP Protection Profile.
* This function should be called after the handshake is
* completed.
*
* \param ssl SSL context
*
* \return Protection Profile enum member, SRTP_UNSET_PROFILE if no protocol was negotiated.
*/
enum mbedtls_DTLS_SRTP_protection_profiles mbedtls_ssl_get_dtls_srtp_protection_profile( const mbedtls_ssl_context *ssl);
#endif /* MBEDTLS_SSL_DTLS_SRTP */
/**
* \brief Set the maximum supported version sent from the client side
* and/or accepted at the server side

163
library/ssl_cli.c
View file

@ -756,6 +756,79 @@ static int ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
}
#endif /* MBEDTLS_SSL_ALPN */
#if defined (MBEDTLS_SSL_DTLS_SRTP)
static void ssl_write_use_srtp_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, size_t *olen )
{
unsigned char *p = buf;
size_t protection_profiles_index = 0;
*olen = 0;
if( (ssl->dtls_srtp_profiles_list == NULL) || (ssl->dtls_srtp_profiles_list_len == 0) )
{
return;
}
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding use_srtp extension" ) );
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_USE_SRTP >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_USE_SRTP ) & 0xFF );
/* RFC5764 section 4.1.1
* uint8 SRTPProtectionProfile[2];
*
* struct {
* SRTPProtectionProfiles SRTPProtectionProfiles;
* opaque srtp_mki<0..255>;
* } UseSRTPData;
* SRTPProtectionProfile SRTPProtectionProfiles<2..2^16-1>;
*
* Note: srtp_mki is not supported
*/
/* Extension length = 2bytes for profiles lenght, ssl->dtls_srtp_profiles_list_len*2 (each profile is 2 bytes length ) + 1 byte for the non implemented srtp_mki vector length (always 0) */
*p++ = (unsigned char)( ( ( 2 + 2*(ssl->dtls_srtp_profiles_list_len) + 1 ) >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( ( 2 + 2*(ssl->dtls_srtp_profiles_list_len) + 1 ) ) & 0xFF );
/* protection profile length: 2*(ssl->dtls_srtp_profiles_list_len) */
*p++ = (unsigned char)( ( ( 2*(ssl->dtls_srtp_profiles_list_len) ) >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( 2*(ssl->dtls_srtp_profiles_list_len) ) & 0xFF );
for( protection_profiles_index=0; protection_profiles_index < ssl->dtls_srtp_profiles_list_len; protection_profiles_index++ )
{
switch (ssl->dtls_srtp_profiles_list[protection_profiles_index]) {
case MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80:
*p++ = ( ( ( MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80_IANA_VALUE ) >> 8 ) & 0xFF);
*p++ = ( ( MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80_IANA_VALUE ) & 0xFF);
break;
case MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32:
*p++ = ( ( ( MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32_IANA_VALUE ) >> 8 ) & 0xFF);
*p++ = ( ( MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32_IANA_VALUE ) & 0xFF);
break;
case MBEDTLS_SRTP_NULL_HMAC_SHA1_80:
*p++ = ( ( ( MBEDTLS_SRTP_NULL_HMAC_SHA1_80_IANA_VALUE ) >> 8 ) & 0xFF);
*p++ = ( ( MBEDTLS_SRTP_NULL_HMAC_SHA1_80_IANA_VALUE ) & 0xFF);
break;
case MBEDTLS_SRTP_NULL_HMAC_SHA1_32:
*p++ = ( ( ( MBEDTLS_SRTP_NULL_HMAC_SHA1_32_IANA_VALUE ) >> 8 ) & 0xFF);
*p++ = ( ( MBEDTLS_SRTP_NULL_HMAC_SHA1_32_IANA_VALUE ) & 0xFF);
break;
default:
/* Note: we shall never arrive here as protection profiles is checked by ssl_set_dtls_srtp_protection_profiles function */
MBEDTLS_SSL_DEBUG_MSG( 1, ( "client hello, ignore illegal DTLS-SRTP protection profile %d", ssl->dtls_srtp_profiles_list[protection_profiles_index]) );
break;
}
}
*p++ = 0x00; /* non implemented srtp_mki vector length is always 0 */
/* total extension length: extension type (2 bytes) + extension length (2 bytes) + protection profile length (2 bytes) + 2*nb protection profiles + srtp_mki vector length(1 byte)*/
*olen = 2 + 2 + 2 + 2*(ssl->dtls_srtp_profiles_list_len) + 1;
}
#endif /* MBEDTLS_SSL_DTLS_SRTP */
/*
* Generate random bytes for ClientHello
*/
@ -1277,6 +1350,11 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
ext_len += olen;
#endif
#if defined(MBEDTLS_SSL_DTLS_SRTP)
ssl_write_use_srtp_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
#endif
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
if( ( ret = ssl_write_session_ticket_ext( ssl, p + 2 + ext_len,
end, &olen ) ) != 0 )
@ -1710,6 +1788,81 @@ static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
}
#endif /* MBEDTLS_SSL_ALPN */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
static int ssl_parse_use_srtp_ext( mbedtls_ssl_context *ssl,
const unsigned char *buf, size_t len )
{
enum mbedtls_DTLS_SRTP_protection_profiles server_protection = MBEDTLS_SRTP_UNSET_PROFILE;
size_t i;
uint16_t server_protection_profile_value = 0;
/* If use_srtp is not configured, just ignore the extension */
if( ( ssl->dtls_srtp_profiles_list == NULL ) || ( ssl->dtls_srtp_profiles_list_len == 0 ) )
return( 0 );
/* RFC5764 section 4.1.1
* uint8 SRTPProtectionProfile[2];
*
* struct {
* SRTPProtectionProfiles SRTPProtectionProfiles;
* opaque srtp_mki<0..255>;
* } UseSRTPData;
* SRTPProtectionProfile SRTPProtectionProfiles<2..2^16-1>;
*
* Note: srtp_mki is not supported
*/
/* Length is 5 : one protection profile(2 bytes) + length(2 bytes) and potential srtp_mki which won't be parsed */
if( len < 5 )
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
/*
* get the server protection profile
*/
if (((uint16_t)(buf[0]<<8 | buf[1])) != 0x0002) { /* protection profile length must be 0x0002 as we must have only one protection profile in server Hello */
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
} else {
server_protection_profile_value = buf[2]<<8 | buf[3];
}
/*
* Check we have the server profile in our list
*/
for( i=0; i < ssl->dtls_srtp_profiles_list_len; i++)
{
switch ( server_protection_profile_value ) {
case MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80_IANA_VALUE:
server_protection = MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80;
break;
case MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32_IANA_VALUE:
server_protection = MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32;
break;
case MBEDTLS_SRTP_NULL_HMAC_SHA1_80_IANA_VALUE:
server_protection = MBEDTLS_SRTP_NULL_HMAC_SHA1_80;
break;
case MBEDTLS_SRTP_NULL_HMAC_SHA1_32_IANA_VALUE:
server_protection = MBEDTLS_SRTP_NULL_HMAC_SHA1_32;
break;
default:
server_protection = MBEDTLS_SRTP_UNSET_PROFILE;
break;
}
if (server_protection == ssl->dtls_srtp_profiles_list[i]) {
ssl->chosen_dtls_srtp_profile = ssl->dtls_srtp_profiles_list[i];
return 0;
}
}
/* If we get there, no match was found : server problem, it shall never answer with incompatible profile */
ssl->chosen_dtls_srtp_profile = MBEDTLS_SRTP_UNSET_PROFILE;
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
}
#endif /* MBEDTLS_SSL_DTLS_SRTP */
/*
* Parse HelloVerifyRequest. Only called after verifying the HS type.
*/
@ -2278,6 +2431,16 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
break;
#endif /* MBEDTLS_SSL_ALPN */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
case MBEDTLS_TLS_EXT_USE_SRTP:
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found use_srtp extension" ) );
if( ( ret = ssl_parse_use_srtp_ext( ssl, ext + 4, ext_size ) ) != 0 )
return( ret );
break;
#endif /* MBEDTLS_SSL_DTLS_SRTP */
default:
MBEDTLS_SSL_DEBUG_MSG( 3,
( "unknown extension found: %d (ignoring)", ext_id ) );

137
library/ssl_srv.c
View file

@ -776,6 +776,78 @@ static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
}
#endif /* MBEDTLS_SSL_ALPN */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
static int ssl_parse_use_srtp_ext( mbedtls_ssl_context *ssl,
const unsigned char *buf, size_t len )
{
enum mbedtls_DTLS_SRTP_protection_profiles client_protection = MBEDTLS_SRTP_UNSET_PROFILE;
size_t i,j;
uint16_t profile_length;
/* If use_srtp is not configured, just ignore the extension */
if( ( ssl->dtls_srtp_profiles_list == NULL ) || ( ssl->dtls_srtp_profiles_list_len == 0 ) )
return( 0 );
/* RFC5764 section 4.1.1
* uint8 SRTPProtectionProfile[2];
*
* struct {
* SRTPProtectionProfiles SRTPProtectionProfiles;
* opaque srtp_mki<0..255>;
* } UseSRTPData;
* SRTPProtectionProfile SRTPProtectionProfiles<2..2^16-1>;
*
* Note: srtp_mki is not supported
*/
/* Min length is 5 : at least one protection profile(2 bytes) and length(2 bytes) + srtp_mki length(1 byte) */
if( len < 5 )
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
/*
* Use our order of preference
*/
profile_length = buf[0]<<8|buf[1]; /* first 2 bytes are protection profile length(in bytes) */
for( i=0; i < ssl->dtls_srtp_profiles_list_len; i++)
{
/* parse the extension list values are defined in http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml */
for (j=0; j<profile_length; j+=2) { /* parse only the protection profile, srtp_mki is not supported and ignored */
uint16_t protection_profile_value = buf[j+2]<<8 | buf[j+3]; /* +2 to skip the length field */
switch ( protection_profile_value ) {
case MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80_IANA_VALUE:
client_protection = MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80;
break;
case MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32_IANA_VALUE:
client_protection = MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32;
break;
case MBEDTLS_SRTP_NULL_HMAC_SHA1_80_IANA_VALUE:
client_protection = MBEDTLS_SRTP_NULL_HMAC_SHA1_80;
break;
case MBEDTLS_SRTP_NULL_HMAC_SHA1_32_IANA_VALUE:
client_protection = MBEDTLS_SRTP_NULL_HMAC_SHA1_32;
break;
default:
client_protection = MBEDTLS_SRTP_UNSET_PROFILE;
break;
}
if (client_protection == ssl->dtls_srtp_profiles_list[i]) {
ssl->chosen_dtls_srtp_profile = ssl->dtls_srtp_profiles_list[i];
return 0;
}
}
}
/* If we get there, no match was found */
ssl->chosen_dtls_srtp_profile = MBEDTLS_SRTP_UNSET_PROFILE;
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
}
#endif /* MBEDTLS_SSL_DTLS_SRTP */
/*
* Auxiliary functions for ServerHello parsing and related actions
*/
@ -1942,6 +2014,15 @@ read_record_header:
break;
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
case MBEDTLS_TLS_EXT_USE_SRTP:
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found use_srtp extension" ) );
ret = ssl_parse_use_srtp_ext( ssl, ext + 4, ext_size );
if ( ret != 0 )
return( ret );
break;
#endif /* MBEDTLS_SSL_DTLS_SRTP */
default:
MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
ext_id ) );
@ -2500,6 +2581,57 @@ static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
}
#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C */
#if defined(MBEDTLS_SSL_DTLS_SRTP )
static void ssl_write_use_srtp_ext( mbedtls_ssl_context *ssl,
unsigned char *buf, size_t *olen )
{
if( ssl->chosen_dtls_srtp_profile == MBEDTLS_SRTP_UNSET_PROFILE )
{
*olen = 0;
return;
}
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding use_srtp extension" ) );
/* extension */
buf[0] = (unsigned char)( ( MBEDTLS_TLS_EXT_USE_SRTP >> 8 ) & 0xFF );
buf[1] = (unsigned char)( ( MBEDTLS_TLS_EXT_USE_SRTP ) & 0xFF );
/* total length (5: only one profile(2 bytes) and length(2bytes) and srtp_mki not supported so zero length(1byte) ) */
buf[2] = 0x00;
buf[3] = 0x05;
/* protection profile length: 2 */
buf[4] = 0x00;
buf[5] = 0x02;
switch (ssl->chosen_dtls_srtp_profile) {
case MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80:
buf[6] = (unsigned char)( ( MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80_IANA_VALUE >> 8) & 0xFF );
buf[7] = (unsigned char)( ( MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80_IANA_VALUE ) & 0xFF );
break;
case MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32:
buf[6] = (unsigned char)( ( MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32_IANA_VALUE >> 8) & 0xFF );
buf[7] = (unsigned char)( ( MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32_IANA_VALUE ) & 0xFF );
break;
case MBEDTLS_SRTP_NULL_HMAC_SHA1_80:
buf[6] = (unsigned char)( ( MBEDTLS_SRTP_NULL_HMAC_SHA1_80_IANA_VALUE >> 8) & 0xFF );
buf[7] = (unsigned char)( ( MBEDTLS_SRTP_NULL_HMAC_SHA1_80_IANA_VALUE ) & 0xFF );
break;
case MBEDTLS_SRTP_NULL_HMAC_SHA1_32:
buf[6] = (unsigned char)( ( MBEDTLS_SRTP_NULL_HMAC_SHA1_32_IANA_VALUE >> 8) & 0xFF );
buf[7] = (unsigned char)( ( MBEDTLS_SRTP_NULL_HMAC_SHA1_32_IANA_VALUE ) & 0xFF );
break;
default:
*olen = 0;
return;
break;
}
buf[8] = 0x00; /* unsupported srtp_mki variable length vector set to 0 */
*olen = 9;
}
#endif /* MBEDTLS_SSL_DTLS_SRTP */
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl )
{
@ -2788,6 +2920,11 @@ static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
ext_len += olen;
#endif
#if defined(MBEDTLS_SSL_DTLS_SRTP)
ssl_write_use_srtp_ext( ssl, p + 2 + ext_len, &olen);
ext_len += olen;
#endif
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %d", ext_len ) );
if( ext_len > 0 )

79
library/ssl_tls.c
View file

@ -871,6 +871,30 @@ static int ssl_populate_transform( mbedtls_ssl_transform *transform,
(void) ssl;
#endif
#if defined(MBEDTLS_SSL_DTLS_SRTP)
/* check if we have a chosen srtp protection profile */
if (ssl->chosen_dtls_srtp_profile != MBEDTLS_SRTP_UNSET_PROFILE) {
/* derive key material for srtp session RFC5764 section 4.2 */
/* master key and master salt are respectively 128 bits and 112 bits for all currently available modes :
* SRTP_AES128_CM_HMAC_SHA1_80, SRTP_AES128_CM_HMAC_SHA1_32
* SRTP_NULL_HMAC_SHA1_80, SRTP_NULL_HMAC_SHA1_32
* So we must export 2*(128 + 112) = 480 bits
*/
ssl->dtls_srtp_keys_len = 60;
ssl->dtls_srtp_keys = (unsigned char *)mbedtls_calloc(1, ssl->dtls_srtp_keys_len);
ret = handshake->tls_prf( session->master, 48, "EXTRACTOR-dtls_srtp",
handshake->randbytes, 64, ssl->dtls_srtp_keys, ssl->dtls_srtp_keys_len );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "dtls srtp prf", ret );
return( ret );
}
}
#endif /* MBEDTLS_SSL_DTLS_SRTP */
/*
* Some data just needs copying into the structure
*/
@ -3859,6 +3883,14 @@ int mbedtls_ssl_setup( mbedtls_ssl_context *ssl,
mbedtls_ssl_reset_in_out_pointers( ssl );
#if defined(MBEDTLS_SSL_DTLS_SRTP)
ssl->dtls_srtp_profiles_list = NULL;
ssl->dtls_srtp_profiles_list_len = 0;
ssl->chosen_dtls_srtp_profile = MBEDTLS_SRTP_UNSET_PROFILE;
ssl->dtls_srtp_keys = NULL;
ssl->dtls_srtp_keys_len = 0;
#endif
if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
goto error;
@ -4685,6 +4717,48 @@ const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl )
}
#endif /* MBEDTLS_SSL_ALPN */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
int mbedtls_ssl_set_dtls_srtp_protection_profiles( mbedtls_ssl_context *ssl, const enum mbedtls_DTLS_SRTP_protection_profiles *profiles, size_t profiles_number)
{
size_t i;
/* check in put validity : must be a list of profiles from enumeration */
/* maximum length is 4 as only 4 protection profiles are defined */
if (profiles_number>4) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
mbedtls_free(ssl->dtls_srtp_profiles_list);
ssl->dtls_srtp_profiles_list = (enum mbedtls_DTLS_SRTP_protection_profiles *)mbedtls_calloc(1, profiles_number*sizeof(enum mbedtls_DTLS_SRTP_protection_profiles));
for (i=0; i<profiles_number; i++) {
switch (profiles[i]) {
case MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80:
case MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32:
case MBEDTLS_SRTP_NULL_HMAC_SHA1_80:
case MBEDTLS_SRTP_NULL_HMAC_SHA1_32:
ssl->dtls_srtp_profiles_list[i] = profiles[i];
break;
default:
mbedtls_free(ssl->dtls_srtp_profiles_list);
ssl->dtls_srtp_profiles_list = NULL;
ssl->dtls_srtp_profiles_list_len = 0;
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
}
/* assign array length */
ssl->dtls_srtp_profiles_list_len = profiles_number;
return( 0 );
}
enum mbedtls_DTLS_SRTP_protection_profiles mbedtls_ssl_get_dtls_srtp_protection_profile( const mbedtls_ssl_context *ssl)
{
return( ssl->chosen_dtls_srtp_profile);
}
#endif /* MBEDTLS_SSL_DTLS_SRTP */
void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor )
{
conf->max_major_ver = major;
@ -6782,6 +6856,11 @@ void mbedtls_ssl_free( mbedtls_ssl_context *ssl )
mbedtls_free( ssl->cli_id );
#endif
#if defined (MBEDTLS_SSL_DTLS_SRTP)
mbedtls_free( ssl->dtls_srtp_profiles_list );
mbedtls_free( ssl->dtls_srtp_keys );
#endif /* MBEDTLS_SSL_DTLS_SRTP */
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) );
/* Actually clear after last debug message */