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Minor fix and improvements

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Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
This commit is contained in:
Johan Pascal 2020-10-22 23:31:00 +02:00
parent 104031547f
commit 76fdf1d60e
6 changed files with 77 additions and 53 deletions
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51
include/mbedtls/ssl.h
View file

@ -414,19 +414,6 @@
#define MBEDTLS_TLS_EXT_RENEGOTIATION_INFO 0xFF01
#if defined(MBEDTLS_SSL_DTLS_SRTP)
/*
* Use_srtp extension protection profiles values as defined in
* http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml
*/
#define MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80 0x0001
#define MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32 0x0002
#define MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80 0x0005
#define MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32 0x0006
/* This one is not iana defined, but for code readability. */
#define MBEDTLS_TLS_SRTP_UNSET 0x0000
#endif /* MBEDTLS_SSL_DTLS_SRTP*/
/*
* Size defines
*/
@ -871,18 +858,24 @@ typedef void mbedtls_ssl_async_cancel_t( mbedtls_ssl_context *ssl );
#if defined(MBEDTLS_SSL_DTLS_SRTP)
#define MBEDTLS_TLS_SRTP_MAX_KEY_MATERIAL_LENGTH 60
#define MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH 255
#define MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH 4
/*
* For code readability use a typedef for DTLS-SRTP profiles
* The supported profiles are defines as macro above:
* MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80
* MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32
* MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80
* MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32
* MBEDTLS_TLS_SRTP_UNSET
*
* Use_srtp extension protection profiles values as defined in
* http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml
*
* Reminder: if this list is expanded mbedtls_ssl_check_srtp_profile_value
* must be updated too.
*/
#define MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80 ( (uint16_t) 0x0001)
#define MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32 ( (uint16_t) 0x0002)
#define MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80 ( (uint16_t) 0x0005)
#define MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32 ( (uint16_t) 0x0006)
/* This one is not iana defined, but for code readability. */
#define MBEDTLS_TLS_SRTP_UNSET ( (uint16_t) 0x0000)
typedef uint16_t mbedtls_ssl_srtp_profile;
typedef struct mbedtls_dtls_srtp_info_t
@ -2096,6 +2089,8 @@ void mbedtls_ssl_conf_export_keys_cb( mbedtls_ssl_config *conf,
* (Default: none.)
*
* \note See \c mbedtls_ssl_export_keys_ext_t.
* \warning Exported key material must not be used for any purpose
* before the (D)TLS handshake is completed
*
* \param conf SSL configuration context
* \param f_export_keys_ext Callback for exporting keys
@ -3249,6 +3244,11 @@ int mbedtls_ssl_conf_dtls_srtp_protection_profiles
* \param mki_value The MKI value to set.
* \param mki_len The length of the MKI value.
*
* \note This function is relevant on client side only.
* The server discovers the mki value during handshake.
* A mki value set on server side using this function
* is ignored.
*
* \return 0 on success
* \return #MBEDTLS_ERR_SSL_BAD_INPUT_DATA
* \return #MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE
@ -3258,12 +3258,17 @@ int mbedtls_ssl_dtls_srtp_set_mki_value( mbedtls_ssl_context *ssl,
uint16_t mki_len );
/**
* \brief Get the negotiated DTLS-SRTP Protection Profile.
* This function should be called after the handshake is
* completed.
*
* \warning This function must be called after the handshake is
* completed. The value returned by this function must
* not be trusted or acted upon before the handshake completes.
*
* \param ssl The SSL context to query.
*
* \return The DTLS SRTP protection profile in use.
* \return The DTLS SRTP protection profile in use. The return type is
* a direct mapping of the iana defined value for protection
* profile on an uint16_t.
* http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml
* \return #MBEDTLS_TLS_SRTP_UNSET if the use of SRTP was not negotiated
* or peer's Hello packet was not parsed yet.
*/

19
library/ssl_cli.c
View file

@ -837,13 +837,14 @@ static int ssl_write_use_srtp_ext( mbedtls_ssl_context *ssl,
{
/*
* Note: we shall never arrive here as protection profiles
* is checked by ssl_set_dtls_srtp_protection_profiles function
* is checked by mbedtls_ssl_conf_dtls_srtp_protection_profiles function
*/
MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, "
"ignore illegal DTLS-SRTP protection profile %d",
"illegal DTLS-SRTP protection profile %d",
ssl->conf->dtls_srtp_profile_list[protection_profiles_index]
) );
return( MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED );
}
}
@ -1872,11 +1873,12 @@ static int ssl_parse_use_srtp_ext( mbedtls_ssl_context *ssl,
}
/*
* Length is 5 and optional mki_value : one protection profile(2 bytes)
* + length(2 bytes) + mki_len(1 byte)
* Length is 5 + optional mki_value : one protection profile length (2 bytes)
* + protection profile (2 bytes)
* + mki_len(1 byte)
* and optional srtp_mki
*/
if( ( len != 5 ) && ( len != ( 5 + mki_len ) ) )
if( len != ( buf[4] + 5u ) )
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
/*
@ -2509,8 +2511,11 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
case MBEDTLS_TLS_EXT_ALPN:
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
if( ( ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ) ) != 0 )
return( ret );
if ( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
{
if( ( ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ) ) != 0 )
return( ret );
}
break;
#endif /* MBEDTLS_SSL_ALPN */

32
library/ssl_srv.c
View file

@ -810,8 +810,9 @@ static int ssl_parse_use_srtp_ext( mbedtls_ssl_context *ssl,
* Min length is 5: at least one protection profile(2 bytes)
* and length(2 bytes) + srtp_mki length(1 byte)
* Check here that we have at least 2 bytes of protection profiles length
* and one of srtp_mki length
*/
if( len < 2 )
if( len < size_of_lengths )
{
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
@ -824,8 +825,8 @@ static int ssl_parse_use_srtp_ext( mbedtls_ssl_context *ssl,
profile_length = ( buf[0] << 8 ) | buf[1];
buf += 2;
/* check the buffer size: at least profiles + profile and mki length */
if( profile_length + size_of_lengths > len ||
/* The profile length cannot be bigger than input buffer size - lengths fields */
if( profile_length > len - size_of_lengths ||
profile_length % 2 != 0 ) /* profiles are 2 bytes long, so the length must be even */
{
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
@ -836,9 +837,9 @@ static int ssl_parse_use_srtp_ext( mbedtls_ssl_context *ssl,
* 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 )
for( j = 0; j < profile_length; j += 2 )
{
uint16_t protection_profile_value = buf[j] << 8 | buf[j+1];
uint16_t protection_profile_value = buf[j] << 8 | buf[j + 1];
client_protection = mbedtls_ssl_check_srtp_profile_value( protection_profile_value );
if( client_protection != MBEDTLS_TLS_SRTP_UNSET )
@ -884,10 +885,7 @@ static int ssl_parse_use_srtp_ext( mbedtls_ssl_context *ssl,
{
ssl->dtls_srtp_info.mki_len = mki_length;
for( i=0; i < mki_length; i++ )
{
ssl->dtls_srtp_info.mki_value[i] = buf[i];
}
memcpy(ssl->dtls_srtp_info.mki_value, buf, mki_length);
MBEDTLS_SSL_DEBUG_BUF( 3, "using mki", ssl->dtls_srtp_info.mki_value,
ssl->dtls_srtp_info.mki_len );
@ -2067,9 +2065,12 @@ read_record_header:
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 );
if ( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
{
ret = ssl_parse_use_srtp_ext( ssl, ext + 4, ext_size );
if ( ret != 0 )
return( ret );
}
break;
#endif /* MBEDTLS_SSL_DTLS_SRTP */
@ -2991,8 +2992,11 @@ static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
#endif
#if defined(MBEDTLS_SSL_DTLS_SRTP)
ssl_write_use_srtp_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
if ( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
{
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 ) );

16
library/ssl_tls.c
View file

@ -4727,16 +4727,14 @@ int mbedtls_ssl_conf_dtls_srtp_protection_profiles( mbedtls_ssl_config *conf,
list_size <= MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH;
p++ )
{
switch( *p )
if ( mbedtls_ssl_check_srtp_profile_value( *p ) != MBEDTLS_TLS_SRTP_UNSET )
{
case MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80:
case MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32:
case MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80:
case MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32:
list_size++;
break;
default: /* unsupported value, stop parsing and set the size to an error value */
list_size = MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH + 1;
list_size++;
}
else
{
/* unsupported value, stop parsing and set the size to an error value */
list_size = MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH + 1;
}
}

6
programs/ssl/ssl_client2.c
View file

@ -680,6 +680,12 @@ exit:
}
#if defined( MBEDTLS_SSL_DTLS_SRTP )
/* Supported SRTP mode needs a maximum of :
* - 16 bytes for key (AES-128)
* - 14 bytes SALT
* One for sender, one for receiver context
*/
#define MBEDTLS_TLS_SRTP_MAX_KEY_MATERIAL_LENGTH 60
typedef struct dtls_srtp_keys
{
unsigned char master_secret[48];

6
programs/ssl/ssl_server2.c
View file

@ -782,6 +782,12 @@ exit:
}
#if defined( MBEDTLS_SSL_DTLS_SRTP )
/* Supported SRTP mode needs a maximum of :
* - 16 bytes for key (AES-128)
* - 14 bytes SALT
* One for sender, one for receiver context
*/
#define MBEDTLS_TLS_SRTP_MAX_KEY_MATERIAL_LENGTH 60
typedef struct dtls_srtp_keys
{
unsigned char master_secret[48];