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Add NSS keylog support to ssl_server2 and ssl_client2

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This commit adds command line options

- nss_keylog=0/1
- nss_keylog_file=FILENAME

to the example programs ssl/ssl_client2 and ssl/ssl_server2 which
allow to print and export the session keys in the NSS keylog
for debugging purposes.
This commit is contained in:
Hanno Becker 2019-08-29 06:31:22 +01:00
parent 4197f0e28e
commit 48f3a3d101
2 changed files with 213 additions and 0 deletions
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105
programs/ssl/ssl_client2.c
View File

@ -135,6 +135,8 @@ int main( void )
#define DFL_CA_CALLBACK 0
#define DFL_EAP_TLS 0
#define DFL_REPRODUCIBLE 0
#define DFL_NSS_KEYLOG 0
#define DFL_NSS_KEYLOG_FILE NULL
#define GET_REQUEST "GET %s HTTP/1.0\r\nExtra-header: "
#define GET_REQUEST_END "\r\n\r\n"
@ -231,8 +233,14 @@ int main( void )
#if defined(MBEDTLS_SSL_EXPORT_KEYS)
#define USAGE_EAP_TLS \
" eap_tls=%%d default: 0 (disabled)\n"
#define USAGE_NSS_KEYLOG \
" nss_keylog=%%d default: 0 (disabled)\n"
#define USAGE_NSS_KEYLOG_FILE \
" nss_keylog_file=%%s\n"
#else
#define USAGE_EAP_TLS ""
#define USAGE_NSS_KEYLOG ""
#define USAGE_NSS_KEYLOG_FILE ""
#endif /* MBEDTLS_SSL_EXPORT_KEYS */
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
@ -489,6 +497,8 @@ struct options
int etm; /* negotiate encrypt then mac? */
int context_crt_cb; /* use context-specific CRT verify callback */
int eap_tls; /* derive EAP-TLS keying material? */
int nss_keylog; /* export NSS key log material */
const char *nss_keylog_file; /* NSS key log file */
int cid_enabled; /* whether to use the CID extension or not */
int cid_enabled_renego; /* whether to use the CID extension or not
* during renegotiation */
@ -535,6 +545,81 @@ static int eap_tls_key_derivation ( void *p_expkey,
}
return( 0 );
}
static int nss_keylog_export( void *p_expkey,
const unsigned char *ms,
const unsigned char *kb,
size_t maclen,
size_t keylen,
size_t ivlen,
unsigned char client_random[32],
unsigned char server_random[32],
mbedtls_tls_prf_types tls_prf_type )
{
char nss_keylog_line[ 200 ];
size_t const client_random_len = 32;
size_t const master_secret_len = 48;
size_t len = 0;
size_t j;
int ret = 0;
((void) p_expkey);
((void) kb);
((void) maclen);
((void) keylen);
((void) ivlen);
((void) server_random);
((void) tls_prf_type);
len += sprintf( nss_keylog_line + len,
"%s", "CLIENT_RANDOM " );
for( j = 0; j < client_random_len; j++ )
{
len += sprintf( nss_keylog_line + len,
"%02x", client_random[j] );
}
len += sprintf( nss_keylog_line + len, " " );
for( j = 0; j < master_secret_len; j++ )
{
len += sprintf( nss_keylog_line + len,
"%02x", ms[j] );
}
len += sprintf( nss_keylog_line + len, "\n" );
nss_keylog_line[ len ] = '\0';
mbedtls_printf( "\n" );
mbedtls_printf( "---------------- NSS KEYLOG -----------------\n" );
mbedtls_printf( "%s", nss_keylog_line );
mbedtls_printf( "---------------------------------------------\n" );
if( opt.nss_keylog_file != NULL )
{
FILE *f;
if( ( f = fopen( opt.nss_keylog_file, "a" ) ) == NULL )
{
ret = -1;
goto exit;
}
if( fwrite( nss_keylog_line, 1, len, f ) != len )
{
ret = -1;
goto exit;
}
fclose( f );
}
exit:
mbedtls_platform_zeroize( nss_keylog_line,
sizeof( nss_keylog_line ) );
return( ret );
}
#endif
static void my_debug( void *ctx, int level,
@ -1204,6 +1289,8 @@ int main( int argc, char *argv[] )
opt.serialize = DFL_SERIALIZE;
opt.eap_tls = DFL_EAP_TLS;
opt.reproducible = DFL_REPRODUCIBLE;
opt.nss_keylog = DFL_NSS_KEYLOG;
opt.nss_keylog_file = DFL_NSS_KEYLOG_FILE;
for( i = 1; i < argc; i++ )
{
@ -1606,6 +1693,16 @@ int main( int argc, char *argv[] )
{
opt.reproducible = 1;
}
else if( strcmp( p, "nss_keylog" ) == 0 )
{
opt.nss_keylog = atoi( q );
if( opt.nss_keylog < 0 || opt.nss_keylog > 1 )
goto usage;
}
else if( strcmp( p, "nss_keylog_file" ) == 0 )
{
opt.nss_keylog_file = q;
}
else
goto usage;
}
@ -2145,8 +2242,16 @@ int main( int argc, char *argv[] )
#if defined(MBEDTLS_SSL_EXPORT_KEYS)
if( opt.eap_tls != 0 )
{
mbedtls_ssl_conf_export_keys_ext_cb( &conf, eap_tls_key_derivation,
&eap_tls_keying );
}
else if( opt.nss_keylog != 0 )
{
mbedtls_ssl_conf_export_keys_ext_cb( &conf,
nss_keylog_export,
NULL );
}
#endif
#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)

108
programs/ssl/ssl_server2.c
View File

@ -176,6 +176,8 @@ int main( void )
#define DFL_CA_CALLBACK 0
#define DFL_EAP_TLS 0
#define DFL_REPRODUCIBLE 0
#define DFL_NSS_KEYLOG 0
#define DFL_NSS_KEYLOG_FILE NULL
#define LONG_RESPONSE "<p>01-blah-blah-blah-blah-blah-blah-blah-blah-blah\r\n" \
"02-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah\r\n" \
@ -308,8 +310,14 @@ int main( void )
#if defined(MBEDTLS_SSL_EXPORT_KEYS)
#define USAGE_EAP_TLS \
" eap_tls=%%d default: 0 (disabled)\n"
#define USAGE_NSS_KEYLOG \
" nss_keylog=%%d default: 0 (disabled)\n"
#define USAGE_NSS_KEYLOG_FILE \
" nss_keylog_file=%%s\n"
#else
#define USAGE_EAP_TLS ""
#define USAGE_NSS_KEYLOG ""
#define USAGE_NSS_KEYLOG_FILE ""
#endif /* MBEDTLS_SSL_EXPORT_KEYS */
#if defined(MBEDTLS_SSL_CACHE_C)
@ -487,6 +495,8 @@ int main( void )
USAGE_TICKETS \
USAGE_EAP_TLS \
USAGE_REPRODUCIBLE \
USAGE_NSS_KEYLOG \
USAGE_NSS_KEYLOG_FILE \
USAGE_CACHE \
USAGE_MAX_FRAG_LEN \
USAGE_TRUNC_HMAC \
@ -598,6 +608,8 @@ struct options
int dgram_packing; /* allow/forbid datagram packing */
int badmac_limit; /* Limit of records with bad MAC */
int eap_tls; /* derive EAP-TLS keying material? */
int nss_keylog; /* export NSS key log material */
const char *nss_keylog_file; /* NSS key log file */
int cid_enabled; /* whether to use the CID extension or not */
int cid_enabled_renego; /* whether to use the CID extension or not
* during renegotiation */
@ -644,6 +656,82 @@ static int eap_tls_key_derivation ( void *p_expkey,
}
return( 0 );
}
static int nss_keylog_export( void *p_expkey,
const unsigned char *ms,
const unsigned char *kb,
size_t maclen,
size_t keylen,
size_t ivlen,
unsigned char client_random[32],
unsigned char server_random[32],
mbedtls_tls_prf_types tls_prf_type )
{
char nss_keylog_line[ 200 ];
size_t const client_random_len = 32;
size_t const master_secret_len = 48;
size_t len = 0;
size_t j;
int ret = 0;
((void) p_expkey);
((void) kb);
((void) maclen);
((void) keylen);
((void) ivlen);
((void) server_random);
((void) tls_prf_type);
len += sprintf( nss_keylog_line + len,
"%s", "CLIENT_RANDOM " );
for( j = 0; j < client_random_len; j++ )
{
len += sprintf( nss_keylog_line + len,
"%02x", client_random[j] );
}
len += sprintf( nss_keylog_line + len, " " );
for( j = 0; j < master_secret_len; j++ )
{
len += sprintf( nss_keylog_line + len,
"%02x", ms[j] );
}
len += sprintf( nss_keylog_line + len, "\n" );
nss_keylog_line[ len ] = '\0';
mbedtls_printf( "\n" );
mbedtls_printf( "---------------- NSS KEYLOG -----------------\n" );
mbedtls_printf( "%s", nss_keylog_line );
mbedtls_printf( "---------------------------------------------\n" );
if( opt.nss_keylog_file != NULL )
{
FILE *f;
if( ( f = fopen( opt.nss_keylog_file, "a" ) ) == NULL )
{
ret = -1;
goto exit;
}
if( fwrite( nss_keylog_line, 1, len, f ) != len )
{
ret = -1;
goto exit;
}
fclose( f );
}
exit:
mbedtls_platform_zeroize( nss_keylog_line,
sizeof( nss_keylog_line ) );
return( ret );
}
#endif
static void my_debug( void *ctx, int level,
@ -1892,6 +1980,8 @@ int main( int argc, char *argv[] )
opt.serialize = DFL_SERIALIZE;
opt.eap_tls = DFL_EAP_TLS;
opt.reproducible = DFL_REPRODUCIBLE;
opt.nss_keylog = DFL_NSS_KEYLOG;
opt.nss_keylog_file = DFL_NSS_KEYLOG_FILE;
for( i = 1; i < argc; i++ )
{
@ -2320,6 +2410,16 @@ int main( int argc, char *argv[] )
{
opt.reproducible = 1;
}
else if( strcmp( p, "nss_keylog" ) == 0 )
{
opt.nss_keylog = atoi( q );
if( opt.nss_keylog < 0 || opt.nss_keylog > 1 )
goto usage;
}
else if( strcmp( p, "nss_keylog_file" ) == 0 )
{
opt.nss_keylog_file = q;
}
else
goto usage;
}
@ -2960,8 +3060,16 @@ int main( int argc, char *argv[] )
#if defined(MBEDTLS_SSL_EXPORT_KEYS)
if( opt.eap_tls != 0 )
{
mbedtls_ssl_conf_export_keys_ext_cb( &conf, eap_tls_key_derivation,
&eap_tls_keying );
}
else if( opt.nss_keylog != 0 )
{
mbedtls_ssl_conf_export_keys_ext_cb( &conf,
nss_keylog_export,
NULL );
}
#endif
#if defined(MBEDTLS_SSL_ALPN)