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https://github.com/yuzu-emu/mbedtls.git
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Added pre-shared key handling for the server side of SSL / TLS
Server side handling of the pure PSK ciphersuites is now in the base code.
This commit is contained in:
Paul Bakker
parent
70df2fbaa5
commit
fbb17804d8
@ -1026,14 +1026,16 @@ static int ssl_write_certificate_request( ssl_context *ssl )
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size_t n = 0, dn_size, total_dn_size;
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unsigned char *buf, *p;
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const x509_cert *crt;
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const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
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SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
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ssl->state++;
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if( ssl->authmode == SSL_VERIFY_NONE )
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if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
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ssl->authmode == SSL_VERIFY_NONE )
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{
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SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
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SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
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return( 0 );
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}
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@ -1536,6 +1538,57 @@ static int ssl_parse_encrypted_pms_secret( ssl_context *ssl )
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return( ret );
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}
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static int ssl_parse_client_psk_identity( ssl_context *ssl )
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{
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int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
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#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
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size_t n;
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unsigned char *p = ssl->handshake->premaster;
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if( ssl->psk == NULL || ssl->psk_identity == NULL ||
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ssl->psk_identity_len == 0 || ssl->psk_len == 0 )
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{
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SSL_DEBUG_MSG( 1, ( "got no pre-shared key" ) );
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return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED );
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}
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/*
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* Receive client pre-shared key identiy name
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*/
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n = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
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if( n < 1 || n > 65535 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
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}
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if( n != ssl->psk_identity_len ||
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memcmp( ssl->psk_identity, ssl->in_msg + 6, n ) != 0 )
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{
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SSL_DEBUG_BUF( 3, "Unknown PSK identity", ssl->in_msg + 6, n );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
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}
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*(p++) = (unsigned char)( ssl->psk_len >> 8 );
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*(p++) = (unsigned char)( ssl->psk_len );
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p += ssl->psk_len;
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*(p++) = (unsigned char)( ssl->psk_len >> 8 );
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*(p++) = (unsigned char)( ssl->psk_len );
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memcpy( p, ssl->psk, ssl->psk_len );
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p += ssl->psk_len;
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ssl->handshake->pmslen = 4 + 2 * ssl->psk_len;
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ret = 0;
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#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */
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return( ret );
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}
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static int ssl_parse_client_key_exchange( ssl_context *ssl )
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{
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int ret;
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@ -1579,6 +1632,14 @@ static int ssl_parse_client_key_exchange( ssl_context *ssl )
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return( ret );
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}
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}
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else if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK )
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{
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if( ( ret = ssl_parse_client_psk_identity( ssl ) ) != 0 )
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{
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SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
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return( ret );
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}
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}
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else
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{
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if( ( ret = ssl_parse_encrypted_pms_secret( ssl ) ) != 0 )
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@ -1608,10 +1669,12 @@ static int ssl_parse_certificate_verify( ssl_context *ssl )
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unsigned char hash[48];
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md_type_t md_alg = POLARSSL_MD_NONE;
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unsigned int hashlen = 0;
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const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
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SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
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if( ssl->session_negotiate->peer_cert == NULL )
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if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
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ssl->session_negotiate->peer_cert == NULL )
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{
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SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
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ssl->state++;
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@ -56,6 +56,8 @@
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#define DFL_CA_PATH ""
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#define DFL_CRT_FILE ""
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#define DFL_KEY_FILE ""
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#define DFL_PSK ""
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#define DFL_PSK_IDENTITY "Client_identity"
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#define DFL_FORCE_CIPHER 0
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#define DFL_RENEGOTIATION SSL_RENEGOTIATION_ENABLED
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#define DFL_ALLOW_LEGACY SSL_LEGACY_NO_RENEGOTIATION
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@ -78,6 +80,8 @@ struct options
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char *ca_path; /* the path with the CA certificate(s) reside */
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char *crt_file; /* the file with the client certificate */
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char *key_file; /* the file with the client key */
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char *psk; /* the pre-shared key */
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char *psk_identity; /* the pre-shared key identity */
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int force_ciphersuite[2]; /* protocol/ciphersuite to use, or all */
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int renegotiation; /* enable / disable renegotiation */
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int allow_legacy; /* allow legacy renegotiation */
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@ -121,6 +125,9 @@ void my_debug( void *ctx, int level, const char *str )
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" options: ssl3, tls1, tls1_1, tls1_2\n" \
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" auth_mode=%%s default: \"optional\"\n" \
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" options: none, optional, required\n" \
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" psk=%%s default: \"\" (in hex, without 0x)\n" \
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" psk_identity=%%s default: \"Client_identity\"\n" \
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"\n" \
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" force_ciphersuite=<name> default: all enabled\n"\
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" acceptable ciphersuite names:\n"
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@ -146,6 +153,8 @@ int main( int argc, char *argv[] )
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int listen_fd;
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int client_fd = -1;
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unsigned char buf[1024];
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unsigned char psk[256];
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size_t psk_len = 0;
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char *pers = "ssl_server2";
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entropy_context entropy;
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@ -197,6 +206,8 @@ int main( int argc, char *argv[] )
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opt.ca_path = DFL_CA_PATH;
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opt.crt_file = DFL_CRT_FILE;
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opt.key_file = DFL_KEY_FILE;
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opt.psk = DFL_PSK;
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opt.psk_identity = DFL_PSK_IDENTITY;
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opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
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opt.renegotiation = DFL_RENEGOTIATION;
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opt.allow_legacy = DFL_ALLOW_LEGACY;
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@ -230,6 +241,10 @@ int main( int argc, char *argv[] )
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opt.crt_file = q;
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else if( strcmp( p, "key_file" ) == 0 )
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opt.key_file = q;
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else if( strcmp( p, "psk" ) == 0 )
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opt.psk = q;
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else if( strcmp( p, "psk_identity" ) == 0 )
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opt.psk_identity = q;
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else if( strcmp( p, "force_ciphersuite" ) == 0 )
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{
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opt.force_ciphersuite[0] = -1;
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@ -282,6 +297,54 @@ int main( int argc, char *argv[] )
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goto usage;
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}
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/*
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* Unhexify the pre-shared key if any is given
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*/
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if( strlen( opt.psk ) )
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{
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unsigned char c;
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size_t j;
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if( strlen( opt.psk ) % 2 != 0 )
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{
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printf("pre-shared key not valid hex\n");
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goto exit;
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}
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psk_len = strlen( opt.psk ) / 2;
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for( j = 0; j < strlen( opt.psk ); j += 2 )
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{
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c = opt.psk[j];
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if( c >= '0' && c <= '9' )
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c -= '0';
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else if( c >= 'a' && c <= 'f' )
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c -= 'a' - 10;
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else if( c >= 'A' && c <= 'F' )
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c -= 'A' - 10;
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else
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{
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printf("pre-shared key not valid hex\n");
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goto exit;
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}
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psk[ j / 2 ] = c << 4;
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c = opt.psk[j + 1];
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if( c >= '0' && c <= '9' )
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c -= '0';
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else if( c >= 'a' && c <= 'f' )
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c -= 'a' - 10;
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else if( c >= 'A' && c <= 'F' )
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c -= 'A' - 10;
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else
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{
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printf("pre-shared key not valid hex\n");
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goto exit;
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}
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psk[ j / 2 ] |= c;
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}
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}
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/*
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* 0. Initialize the RNG and the session data
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*/
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@ -421,6 +484,8 @@ int main( int argc, char *argv[] )
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ssl_set_ca_chain( &ssl, &cacert, NULL, NULL );
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ssl_set_own_cert( &ssl, &srvcert, &rsa );
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ssl_set_psk( &ssl, psk, psk_len, (unsigned char *) opt.psk_identity,
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strlen( opt.psk_identity ) );
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#if defined(POLARSSL_DHM_C)
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/*
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