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Start using client IP in HelloVerifyRequest

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Dummy fixed key for now.
This commit is contained in:
Manuel Pégourié-Gonnard 2014-07-22 20:40:40 +02:00 committed by Paul Bakker
parent 336b824f07
commit dd3cdb0fbc
1 changed files with 46 additions and 3 deletions
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49
library/ssl_srv.c
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@ -1137,25 +1137,68 @@ have_ciphersuite_v2:
#endif /* POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */
#if defined(POLARSSL_SSL_PROTO_DTLS)
/*
* If DTLS is in use, then at least one of SHA-1, SHA-256, SHA-512 is
* available. Try SHA-256 first, 512 wastes resources since we need to stay
* with max 32 bytes of cookie for DTLS 1.0
*/
#if defined(POLARSSL_SHA256_C)
#define HVR_MD POLARSSL_MD_SHA256
#define HVR_MD_LEN 32
#define HVR_MD_USE 32
#elif defined(POLARSSL_SHA512_C)
#define HVR_MD POLARSSL_MD_SHA384
#define HVR_MD_LEN 48
#define HVR_MD_USE 32
#elif defined(POLARSSL_SHA1_C)
#define HVR_MD POLARSSL_MD_SHA1
#define HVR_MD_LEN 20
#define HVR_MD_USE 20
#else
#error "DTLS hello verify needs SHA-1 or SHA-2"
#endif
/*
* Generate cookie for DTLS ClientHello verification
*/
static int ssl_generate_verify_cookie( ssl_context *ssl )
{
int ret;
unsigned char *cookie = ssl->handshake->verify_cookie;
unsigned char cookie_len;
unsigned char hmac_out[HVR_MD_LEN];
unsigned char hmac_key[32] = { 0 }; /* temporary! */
md_context_t hmac_ctx;
md_init( &hmac_ctx );
polarssl_free( cookie );
cookie_len = 16; /* fixed for now */
cookie_len = HVR_MD_LEN;
if( ( cookie = polarssl_malloc( cookie_len ) ) == NULL )
{
SSL_DEBUG_MSG( 1, ( "malloc (%d bytes) failed\n", cookie_len ) );
return( POLARSSL_ERR_SSL_MALLOC_FAILED );
}
/* Dummy, fixed string for now */
memset( cookie, 0x2a, cookie_len );
/* Do a HMAC of client id */
ret = md_init_ctx( &hmac_ctx, md_info_from_type( HVR_MD ) );
if( ret != 0 )
{
SSL_DEBUG_RET( 0, "md_init_ctx", ret );
return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
}
/* Only possible error is if hmac_ctx wasn't initialized */
(void) md_hmac_starts( &hmac_ctx, hmac_key, sizeof( hmac_key ) );
(void) md_hmac_update( &hmac_ctx, ssl->cli_id, ssl->cli_id_len );
(void) md_hmac_finish( &hmac_ctx, hmac_out );
memcpy( cookie, hmac_out, HVR_MD_USE );
md_free( &hmac_ctx );
ssl->handshake->verify_cookie = cookie;
ssl->handshake->verify_cookie_len = cookie_len;