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Add test with sending application data via DTLS

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Signed-off-by: Piotr Nowicki <piotr.nowicki@arm.com>
This commit is contained in:
Piotr Nowicki 2020-02-12 13:53:36 +01:00
parent 20b3a68e70
commit 6a7f01c237
2 changed files with 327 additions and 101 deletions
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58
tests/suites/test_suite_ssl.data
View File

@ -275,44 +275,82 @@ DTLS Handshake with serialization, tls1_2
depends_on:MBEDTLS_SSL_PROTO_TLS1_2:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_SSL_PROTO_DTLS depends_on:MBEDTLS_SSL_PROTO_TLS1_2:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_SSL_PROTO_DTLS
handshake:"":MBEDTLS_SSL_MINOR_VERSION_3:MBEDTLS_PK_RSA:"":1:1 handshake:"":MBEDTLS_SSL_MINOR_VERSION_3:MBEDTLS_PK_RSA:"":1:1
Test sending app data MFL=512 without fragmentation Sending app data via TLS, MFL=512 without fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_512:400:512:1:1 send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_512:400:512:1:1
Test sending app data MFL=512 with fragmentation Sending app data via TLS, MFL=512 with fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_512:513:1536:2:3 send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_512:513:1536:2:3
Test sending app data MFL=1024 without fragmentation Sending app data via TLS, MFL=1024 without fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_1024:1000:1024:1:1 send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_1024:1000:1024:1:1
Test sending app data MFL=1024 with fragmentation Sending app data via TLS, MFL=1024 with fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_1024:1025:5120:2:5 send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_1024:1025:5120:2:5
Test sending app data MFL=2048 without fragmentation Sending app data via TLS, MFL=2048 without fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_2048:2000:2048:1:1 send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_2048:2000:2048:1:1
Test sending app data MFL=2048 with fragmentation Sending app data via TLS, MFL=2048 with fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_2048:2049:8192:2:4 send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_2048:2049:8192:2:4
Test sending app data MFL=4096 without fragmentation Sending app data via TLS, MFL=4096 without fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_4096:4000:4096:1:1 send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_4096:4000:4096:1:1
Test sending app data MFL=4096 with fragmentation Sending app data via TLS, MFL=4096 with fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_4096:4097:12288:2:3 send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_4096:4097:12288:2:3
Test sending app data without MFL and without fragmentation Sending app data via TLS without MFL and without fragmentation
send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_NONE:16001:16384:1:1 send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_NONE:16001:16384:1:1
Test sending app data without MFL and with fragmentation Sending app data via TLS without MFL and with fragmentation
send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_NONE:16385:100000:2:7 send_application_data:MBEDTLS_SSL_MAX_FRAG_LEN_NONE:16385:100000:2:7
Sending app data via DTLS, MFL=512 without fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data_dtls:MBEDTLS_SSL_MAX_FRAG_LEN_512:400:512:1:1
Sending app data via DTLS, MFL=512 with fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data_dtls:MBEDTLS_SSL_MAX_FRAG_LEN_512:513:1536:0:0
Sending app data via DTLS, MFL=1024 without fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data_dtls:MBEDTLS_SSL_MAX_FRAG_LEN_1024:1000:1024:1:1
Sending app data via DTLS, MFL=1024 with fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data_dtls:MBEDTLS_SSL_MAX_FRAG_LEN_1024:1025:5120:0:0
Sending app data via DTLS, MFL=2048 without fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data_dtls:MBEDTLS_SSL_MAX_FRAG_LEN_2048:2000:2048:1:1
Sending app data via DTLS, MFL=2048 with fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data_dtls:MBEDTLS_SSL_MAX_FRAG_LEN_2048:2049:8192:0:0
Sending app data via DTLS, MFL=4096 without fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data_dtls:MBEDTLS_SSL_MAX_FRAG_LEN_4096:4000:4096:1:1
Sending app data via DTLS, MFL=4096 with fragmentation
depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
send_application_data_dtls:MBEDTLS_SSL_MAX_FRAG_LEN_4096:4097:12288:0:0
Sending app data via DTLS, without MFL and without fragmentation
send_application_data_dtls:MBEDTLS_SSL_MAX_FRAG_LEN_NONE:16001:16384:1:1
Sending app data via DTLS, without MFL and with fragmentation
send_application_data_dtls:MBEDTLS_SSL_MAX_FRAG_LEN_NONE:16385:100000:0:0
SSL DTLS replay: initial state, seqnum 0 SSL DTLS replay: initial state, seqnum 0
ssl_dtls_replay:"":"000000000000":0 ssl_dtls_replay:"":"000000000000":0

370
tests/suites/test_suite_ssl.function
View File

@ -928,31 +928,87 @@ int mbedtls_move_handshake_to_state( mbedtls_ssl_context *ssl,
#endif /* MBEDTLS_X509_CRT_PARSE_C */ #endif /* MBEDTLS_X509_CRT_PARSE_C */
/* /*
* Write application data. Then increase write and fragments counter * Write application data. Increase write counter and fragments counter if
* necessary.
*/ */
int mbedtls_ssl_write_fragment( mbedtls_ssl_context *ssl, unsigned char *buf, int mbedtls_ssl_write_fragment( mbedtls_ssl_context *ssl, unsigned char *buf,
int ln, int *writen, int *fragments ) int buf_len, int *written,
int *fragments, const int expected_fragments )
{ {
int ret = mbedtls_ssl_write( ssl, buf + *writen, ln - *writen ); int ret = mbedtls_ssl_write( ssl, buf + *written, buf_len - *written );
if( ret >= 0 ) if( ret > 0 )
{ {
(*fragments)++; (*fragments)++;
*writen += ret; *written += ret;
} }
return ret;
if( expected_fragments == 0 )
{
/* Used for DTLS and the message size larger than MFL. In that case
* the message can not be fragmented and the library should return
* MBEDTLS_ERR_SSL_BAD_INPUT_DATA error. This error must be returned
* to prevent a dead loop inside mbedtls_exchange_data(). */
return ret;
}
else if( expected_fragments == 1 )
{
/* Used for TLS/DTLS and the message size lower than MFL */
TEST_ASSERT( ret == buf_len ||
ret == MBEDTLS_ERR_SSL_WANT_READ ||
ret == MBEDTLS_ERR_SSL_WANT_WRITE );
}
else
{
/* Used for TLS and the message size larger than MFL */
TEST_ASSERT( expected_fragments > 1 );
TEST_ASSERT( ( ret >= 0 && ret <= buf_len ) ||
ret == MBEDTLS_ERR_SSL_WANT_READ ||
ret == MBEDTLS_ERR_SSL_WANT_WRITE );
}
return 0;
exit:
/* Some of the tests failed */
return -1;
} }
/* /*
* Read application data and increase read counter * Read application data and increase read counter if necessary.
*/ */
int mbedtls_ssl_read_fragment( mbedtls_ssl_context *ssl, unsigned char *buf, int ln, int *read ) int mbedtls_ssl_read_fragment( mbedtls_ssl_context *ssl, unsigned char *buf,
int buf_len, int *read,
const int expected_fragments )
{ {
int ret = mbedtls_ssl_read( ssl, buf + *read, ln - *read ); int ret = mbedtls_ssl_read( ssl, buf + *read, buf_len - *read );
if( ret >= 0 ) if( ret > 0 )
{ {
*read += ret; *read += ret;
} }
return ret;
if( expected_fragments == 0 )
{
TEST_ASSERT( ret == 0 );
}
else if( expected_fragments == 1 )
{
TEST_ASSERT( ret == buf_len ||
ret == MBEDTLS_ERR_SSL_WANT_READ ||
ret == MBEDTLS_ERR_SSL_WANT_WRITE );
}
else
{
TEST_ASSERT( expected_fragments > 1 );
TEST_ASSERT( ( ret >= 0 && ret <= buf_len ) ||
ret == MBEDTLS_ERR_SSL_WANT_READ ||
ret == MBEDTLS_ERR_SSL_WANT_WRITE );
}
return 0;
exit:
/* Some of the tests failed */
return -1;
} }
/* /*
@ -1347,6 +1403,146 @@ static int ssl_populate_session( mbedtls_ssl_session *session,
return( 0 ); return( 0 );
} }
/*
* Perform data exchanging between \p ssl_1 and \p ssl_2 and check if the
* message was sent in the correct number of fragments.
*
* /p ssl_1 and /p ssl_2 Endpoints represented by mbedtls_ssl_context. Both
* of them must be initialized and connected beforehand.
* /p msg_len_1 and /p msg_len_2 specify the size of the message to send.
* /p expected_fragments_1 and /p expected_fragments_2 determine in how many
* fragments the message should be sent.
* expected_fragments is 0: can be used for DTLS testing while the message
* size is larger than MFL. In that case the message
* cannot be fragmented and sent to the second endpoint.
* This value can be used for negative tests.
* expected_fragments is 1: can be used for TLS/DTLS testing while the
* message size is below MFL
* expected_fragments > 1: can be used for TLS testing while the message
* size is larger than MFL
*
* \retval 0 on success, otherwise error code.
*/
int mbedtls_exchange_data( mbedtls_ssl_context *ssl_1,
int msg_len_1, const int expected_fragments_1,
mbedtls_ssl_context *ssl_2,
int msg_len_2, const int expected_fragments_2 )
{
unsigned char *msg_buf_1 = malloc( msg_len_1 );
unsigned char *msg_buf_2 = malloc( msg_len_2 );
unsigned char *in_buf_1 = malloc( msg_len_2 );
unsigned char *in_buf_2 = malloc( msg_len_1 );
int msg_type, ret = -1;
/* Perform this test with two message types. At first use a message
* consisting of only 0x00 for the client and only 0xFF for the server.
* At the second time use message with generated data */
for( msg_type = 0; msg_type < 2; msg_type++ )
{
int written_1 = 0;
int written_2 = 0;
int read_1 = 0;
int read_2 = 0;
int fragments_1 = 0;
int fragments_2 = 0;
if( msg_type == 0 )
{
memset( msg_buf_1, 0x00, msg_len_1 );
memset( msg_buf_2, 0xff, msg_len_2 );
}
else
{
int i, j = 0;
for( i = 0; i < msg_len_1; i++ )
{
msg_buf_1[i] = j++ & 0xFF;
}
for( i = 0; i < msg_len_2; i++ )
{
msg_buf_2[i] = ( j -= 5 ) & 0xFF;
}
}
while( read_1 < msg_len_2 || read_2 < msg_len_1 )
{
/* ssl_1 sending */
if( msg_len_1 > written_1 )
{
ret = mbedtls_ssl_write_fragment( ssl_1, msg_buf_1,
msg_len_1, &written_1,
&fragments_1,
expected_fragments_1 );
if( expected_fragments_1 == 0 )
{
/* This error is expected when the message is too large and
* cannot be fragmented */
TEST_ASSERT( ret == MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
msg_len_1 = 0;
}
else
{
TEST_ASSERT( ret == 0 );
}
}
/* ssl_2 sending */
if( msg_len_2 > written_2 )
{
ret = mbedtls_ssl_write_fragment( ssl_2, msg_buf_2,
msg_len_2, &written_2,
&fragments_2,
expected_fragments_2 );
if( expected_fragments_2 == 0 )
{
/* This error is expected when the message is too large and
* cannot be fragmented */
TEST_ASSERT( ret == MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
msg_len_2 = 0;
}
else
{
TEST_ASSERT( ret == 0 );
}
}
/* ssl_1 reading */
if( read_1 < msg_len_2 )
{
ret = mbedtls_ssl_read_fragment( ssl_1, in_buf_1,
msg_len_2, &read_1,
expected_fragments_1 );
TEST_ASSERT( ret == 0 );
}
/* ssl_2 reading */
if( read_2 < msg_len_1 )
{
ret = mbedtls_ssl_read_fragment( ssl_2, in_buf_2,
msg_len_1, &read_2,
expected_fragments_2 );
TEST_ASSERT( ret == 0 );
}
}
ret = -1;
TEST_ASSERT( 0 == memcmp( msg_buf_1, in_buf_2, msg_len_1 ) );
TEST_ASSERT( 0 == memcmp( msg_buf_2, in_buf_1, msg_len_2 ) );
TEST_ASSERT( fragments_1 == expected_fragments_1 );
TEST_ASSERT( fragments_2 == expected_fragments_2 );
}
ret = 0;
exit:
free( msg_buf_1 );
free( in_buf_1 );
free( msg_buf_2 );
free( in_buf_2 );
return ret;
}
/* END_HEADER */ /* END_HEADER */
/* BEGIN_DEPENDENCIES /* BEGIN_DEPENDENCIES
@ -3262,15 +3458,11 @@ exit:
/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED:!MBEDTLS_USE_PSA_CRYPTO:MBEDTLS_PKCS1_V15 */ /* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED:!MBEDTLS_USE_PSA_CRYPTO:MBEDTLS_PKCS1_V15 */
void send_application_data( int mfl, int cli_msg_len, int srv_msg_len, void send_application_data( int mfl, int cli_msg_len, int srv_msg_len,
const int expected_cli_frames, const int expected_cli_fragments,
const int expected_srv_frames ) const int expected_srv_fragments )
{ {
enum { BUFFSIZE = 2048 }; enum { BUFFSIZE = 2048 };
mbedtls_endpoint server, client; mbedtls_endpoint server, client;
unsigned char *cli_msg_buf = malloc( cli_msg_len );
unsigned char *cli_in_buf = malloc( srv_msg_len );
unsigned char *srv_msg_buf = malloc( srv_msg_len );
unsigned char *srv_in_buf = malloc( cli_msg_len );
int ret = -1; int ret = -1;
ret = mbedtls_endpoint_init( &server, MBEDTLS_SSL_IS_SERVER, MBEDTLS_PK_RSA, ret = mbedtls_endpoint_init( &server, MBEDTLS_SSL_IS_SERVER, MBEDTLS_PK_RSA,
@ -3302,83 +3494,79 @@ void send_application_data( int mfl, int cli_msg_len, int srv_msg_len,
TEST_ASSERT( client.ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER ); TEST_ASSERT( client.ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER );
TEST_ASSERT( server.ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER ); TEST_ASSERT( server.ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER );
/* Perform this test with two message types. At first use a message /* Start data exchanging test */
* consisting of only 0x00 for the client and only 0xFF for the server. ret = mbedtls_exchange_data( &(client.ssl), cli_msg_len, expected_cli_fragments,
* At the second time use message with generated data */ &(server.ssl), srv_msg_len, expected_srv_fragments );
for( int msg_type = 0; msg_type < 2; msg_type++ ) TEST_ASSERT( ret == 0 );
{
int cli_writen = 0;
int srv_writen = 0;
int cli_read = 0;
int srv_read = 0;
int cli_fragments = 0;
int srv_fragments = 0;
if( msg_type == 0 )
{
memset( cli_msg_buf, 0x00, cli_msg_len );
memset( srv_msg_buf, 0xff, srv_msg_len );
}
else
{
int j = 0;
for( int i = 0; i < cli_msg_len; i++ )
cli_msg_buf[i] = j++ & 0xFF;
for( int i = 0; i < srv_msg_len; i++ )
srv_msg_buf[i] = ( j -= 5 ) & 0xFF;
}
while( cli_read < srv_msg_len || srv_read < cli_msg_len )
{
/* Client sending */
if( cli_msg_len > cli_writen )
{
ret = mbedtls_ssl_write_fragment( &(client.ssl), cli_msg_buf,
cli_msg_len, &cli_writen, &cli_fragments );
TEST_ASSERT( ( ret >= 0 && ret <= cli_msg_len ) ||
ret == MBEDTLS_ERR_SSL_WANT_WRITE );
}
/* Server sending */
if( srv_msg_len > srv_writen )
{
ret = mbedtls_ssl_write_fragment( &(server.ssl), srv_msg_buf,
srv_msg_len, &srv_writen, &srv_fragments );
TEST_ASSERT( ( ret >= 0 && ret <= srv_msg_len ) ||
ret == MBEDTLS_ERR_SSL_WANT_WRITE );
}
/* Client reading */
if( cli_read < srv_msg_len )
{
ret = mbedtls_ssl_read_fragment( &(client.ssl), cli_in_buf,
srv_msg_len, &cli_read );
TEST_ASSERT( ( ret >= 0 && ret <= srv_msg_len ) ||
ret == MBEDTLS_ERR_SSL_WANT_READ );
}
/* Server reading */
if( srv_read < cli_msg_len )
{
ret = mbedtls_ssl_read_fragment( &(server.ssl), srv_in_buf,
cli_msg_len, &srv_read );
TEST_ASSERT( ( ret >= 0 && ret <= cli_msg_len ) ||
ret == MBEDTLS_ERR_SSL_WANT_READ );
}
}
TEST_ASSERT( 0 == memcmp( cli_msg_buf, srv_in_buf, cli_msg_len ) );
TEST_ASSERT( 0 == memcmp( srv_msg_buf, cli_in_buf, srv_msg_len ) );
TEST_ASSERT( cli_fragments == expected_cli_frames );
TEST_ASSERT( srv_fragments == expected_srv_frames );
}
exit: exit:
mbedtls_endpoint_free( &client, NULL ); mbedtls_endpoint_free( &client, NULL );
mbedtls_endpoint_free( &server, NULL ); mbedtls_endpoint_free( &server, NULL );
free( cli_msg_buf ); }
free( cli_in_buf ); /* END_CASE */
free( srv_msg_buf );
free( srv_in_buf ); /* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED:!MBEDTLS_USE_PSA_CRYPTO:MBEDTLS_PKCS1_V15 */
void send_application_data_dtls( int mfl, int cli_msg_len, int srv_msg_len,
const int expected_cli_fragments,
const int expected_srv_fragments )
{
enum { BUFFSIZE = 17000 };
#if defined(MBEDTLS_TIMING_C)
mbedtls_timing_delay_context timer_client, timer_server;
#endif
mbedtls_endpoint server, client;
mbedtls_test_message_queue server_queue, client_queue;
mbedtls_test_message_socket_context server_context, client_context;
int ret = -1;
/* Initializing endpoints and communication */
ret = mbedtls_endpoint_init( &server, MBEDTLS_SSL_IS_SERVER, MBEDTLS_PK_RSA,
&server_context, &server_queue, &client_queue );
TEST_ASSERT( ret == 0 );
ret = mbedtls_endpoint_init( &client, MBEDTLS_SSL_IS_CLIENT, MBEDTLS_PK_RSA,
&client_context, &client_queue, &server_queue );
TEST_ASSERT( ret == 0 );
#if defined(MBEDTLS_TIMING_C)
mbedtls_ssl_set_timer_cb( &client.ssl, &timer_client,
mbedtls_timing_set_delay,
mbedtls_timing_get_delay );
mbedtls_ssl_set_timer_cb( &server.ssl, &timer_server,
mbedtls_timing_set_delay,
mbedtls_timing_get_delay );
#endif /* MBEDTLS_TIMING_C */
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
ret = mbedtls_ssl_conf_max_frag_len( &(server.conf), (unsigned char) mfl );
TEST_ASSERT( ret == 0 );
ret = mbedtls_ssl_conf_max_frag_len( &(client.conf), (unsigned char) mfl );
TEST_ASSERT( ret == 0 );
#else
TEST_ASSERT( MBEDTLS_SSL_MAX_FRAG_LEN_NONE == mfl );
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
ret = mbedtls_mock_socket_connect( &(server.socket), &(client.socket),
BUFFSIZE );
TEST_ASSERT( ret == 0 );
ret = mbedtls_move_handshake_to_state( &(client.ssl),
&(server.ssl),
MBEDTLS_SSL_HANDSHAKE_OVER );
TEST_ASSERT( ret == 0 );
TEST_ASSERT( client.ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER );
TEST_ASSERT( server.ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER );
/* Start data exchanging test */
ret = mbedtls_exchange_data( &(client.ssl), cli_msg_len, expected_cli_fragments,
&(server.ssl), srv_msg_len, expected_srv_fragments );
TEST_ASSERT( ret == 0 );
exit:
mbedtls_endpoint_free( &client, &client_context );
mbedtls_endpoint_free( &server, &server_context );
} }
/* END_CASE */ /* END_CASE */