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Avoid using old OpenSSL HMAC functions

This commit is contained in:
Willem Toorop 2022-08-11 12:26:41 +02:00
parent 1748ca4c29
commit 0cb72000f8
6 changed files with 27 additions and 171 deletions
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6
src/gnutls/tls-internal.h
View File

@ -94,10 +94,4 @@ typedef struct _getdns_tls_x509
gnutls_datum_t tls;
} _getdns_tls_x509;
typedef struct _getdns_tls_hmac
{
gnutls_hmac_hd_t tls;
unsigned int md_len;
} _getdns_tls_hmac;
#endif /* _GETDNS_TLS_INTERNAL_H */

49
src/gnutls/tls.c
View File

@ -869,55 +869,6 @@ unsigned char* _getdns_tls_hmac_hash(struct mem_funcs* mfs, int algorithm, const
return res;
}
_getdns_tls_hmac* _getdns_tls_hmac_new(struct mem_funcs* mfs, int algorithm, const void* key, size_t key_size)
{
gnutls_mac_algorithm_t alg;
_getdns_tls_hmac* res;
if (get_gnu_mac_algorithm(algorithm, &alg) != GETDNS_RETURN_GOOD)
return NULL;
if (!(res = GETDNS_MALLOC(*mfs, struct _getdns_tls_hmac)))
return NULL;
if (gnutls_hmac_init(&res->tls, alg, key, key_size) < 0) {
GETDNS_FREE(*mfs, res);
return NULL;
}
res->md_len = gnutls_hmac_get_len(alg);
return res;
}
getdns_return_t _getdns_tls_hmac_add(_getdns_tls_hmac* h, const void* data, size_t data_size)
{
if (!h || !h->tls || !data)
return GETDNS_RETURN_INVALID_PARAMETER;
if (gnutls_hmac(h->tls, data, data_size) < 0)
return GETDNS_RETURN_GENERIC_ERROR;
else
return GETDNS_RETURN_GOOD;
}
unsigned char* _getdns_tls_hmac_end(struct mem_funcs* mfs, _getdns_tls_hmac* h, size_t* output_size)
{
unsigned char* res;
if (!h || !h->tls)
return NULL;
res = (unsigned char*) GETDNS_XMALLOC(*mfs, unsigned char, h->md_len);
if (!res)
return NULL;
gnutls_hmac_deinit(h->tls, res);
if (output_size)
*output_size = h->md_len;
GETDNS_FREE(*mfs, h);
return res;
}
void _getdns_tls_sha1(const void* data, size_t data_size, unsigned char* buf)
{
gnutls_hash_fast(GNUTLS_DIG_SHA1, data, data_size, buf);

8
src/openssl/tls-internal.h
View File

@ -81,12 +81,4 @@ typedef struct _getdns_tls_x509
X509* ssl;
} _getdns_tls_x509;
typedef struct _getdns_tls_hmac
{
HMAC_CTX *ctx;
#ifndef HAVE_HMAC_CTX_NEW
HMAC_CTX ctx_space;
#endif
} _getdns_tls_hmac;
#endif /* _GETDNS_TLS_INTERNAL_H */

64
src/openssl/tls.c
View File

@ -1197,70 +1197,6 @@ unsigned char* _getdns_tls_hmac_hash(struct mem_funcs* mfs, int algorithm, const
return res;
}
_getdns_tls_hmac* _getdns_tls_hmac_new(struct mem_funcs* mfs, int algorithm, const void* key, size_t key_size)
{
const EVP_MD *digester = get_digester(algorithm);
_getdns_tls_hmac* res;
if (!digester)
return NULL;
if (!(res = GETDNS_MALLOC(*mfs, struct _getdns_tls_hmac)))
return NULL;
#ifdef HAVE_HMAC_CTX_NEW
res->ctx = HMAC_CTX_new();
if (!res->ctx) {
GETDNS_FREE(*mfs, res);
return NULL;
}
#else
res->ctx = &res->ctx_space;
HMAC_CTX_init(res->ctx);
#endif
if (!HMAC_Init_ex(res->ctx, key, key_size, digester, NULL)) {
#ifdef HAVE_HMAC_CTX_NEW
HMAC_CTX_free(res->ctx);
#endif
GETDNS_FREE(*mfs, res);
return NULL;
}
return res;
}
getdns_return_t _getdns_tls_hmac_add(_getdns_tls_hmac* h, const void* data, size_t data_size)
{
if (!h || !h->ctx || !data)
return GETDNS_RETURN_INVALID_PARAMETER;
if (!HMAC_Update(h->ctx, data, data_size))
return GETDNS_RETURN_GENERIC_ERROR;
else
return GETDNS_RETURN_GOOD;
}
unsigned char* _getdns_tls_hmac_end(struct mem_funcs* mfs, _getdns_tls_hmac* h, size_t* output_size)
{
unsigned char* res;
unsigned int md_len;
res = (unsigned char*) GETDNS_XMALLOC(*mfs, unsigned char, GETDNS_TLS_MAX_DIGEST_LENGTH);
if (!res)
return NULL;
(void) HMAC_Final(h->ctx, res, &md_len);
#ifdef HAVE_HMAC_CTX_NEW
HMAC_CTX_free(h->ctx);
#endif
GETDNS_FREE(*mfs, h);
if (output_size)
*output_size = md_len;
return res;
}
void _getdns_tls_sha1(const void* data, size_t data_size, unsigned char* buf)
{
SHA1(data, data_size, buf);

38
src/request-internal.c
View File

@ -500,7 +500,9 @@ _getdns_network_validate_tsig(getdns_network_req *req)
unsigned char *result_mac;
size_t result_mac_len;
uint16_t original_id;
_getdns_tls_hmac *hmac;
size_t data_size;
uint8_t *data;
DEBUG_STUB("%s %-35s: Validate TSIG\n", STUB_DEBUG_TSIG, __FUNC__);
for ( rr = _getdns_rr_iter_init(&rr_spc, req->query,
@ -607,19 +609,33 @@ _getdns_network_validate_tsig(getdns_network_req *req)
gldns_read_uint16(req->response + 10) - 1);
gldns_write_uint16(req->response, original_id);
hmac = _getdns_tls_hmac_new(&req->owner->my_mf, req->upstream->tsig_alg, req->upstream->tsig_key, req->upstream->tsig_size);
if (!hmac)
data_size = request_mac_len + 2
+ (size_t)(rr->pos - req->response)
+ gldns_buffer_position(&gbuf);
data = GETDNS_XMALLOC(req->owner->my_mf, uint8_t, data_size);
if (!data) {
DEBUG_STUB("%s %-35s: Error allocating %d bytes\n",
STUB_DEBUG_TSIG, __FUNC__, (int)(data_size));
return;
}
memcpy(data , request_mac - 2 , request_mac_len + 2);
memcpy(data + request_mac_len + 2, req->response, rr->pos - req->response);
memcpy(data + request_mac_len + 2 + (size_t)(rr->pos - req->response)
, tsig_vars, gldns_buffer_position(&gbuf));
_getdns_tls_hmac_add(hmac, request_mac - 2, request_mac_len + 2);
_getdns_tls_hmac_add(hmac, req->response, rr->pos - req->response);
_getdns_tls_hmac_add(hmac, tsig_vars, gldns_buffer_position(&gbuf));
result_mac = _getdns_tls_hmac_end(&req->owner->my_mf, hmac, &result_mac_len);
if (!result_mac)
result_mac = _getdns_tls_hmac_hash(&req->owner->my_mf
, req->upstream->tsig_alg
, req->upstream->tsig_key
, req->upstream->tsig_size
, data, data_size , &result_mac_len);
GETDNS_FREE(req->owner->my_mf, data);
if (!result_mac) {
DEBUG_STUB("%s %-35s: Error calculating TSIG digest\n",
STUB_DEBUG_TSIG, __FUNC__);
return;
DEBUG_STUB("%s %-35s: Result MAC length: %d\n",
STUB_DEBUG_TSIG, __FUNC__, (int)(result_mac_len));
}
DEBUG_STUB("%s %-35s: Result MAC length: %d for %d bytes of data\n",
STUB_DEBUG_TSIG, __FUNC__, (int)(result_mac_len), (int)data_size);
if (result_mac_len == response_mac_len &&
memcmp(result_mac, response_mac, result_mac_len) == 0)
req->tsig_status = GETDNS_DNSSEC_SECURE;

33
src/tls.h
View File

@ -408,39 +408,6 @@ getdns_return_t _getdns_tls_get_api_information(getdns_dict* dict);
*/
unsigned char* _getdns_tls_hmac_hash(struct mem_funcs* mfs, int algorithm, const void* key, size_t key_size, const void* data, size_t data_size, size_t* output_size);
/**
* Return a new HMAC handle.
*
* @param mfs pointer to getdns memory functions.
* @param algorithm hash algorithm to use (<code>GETDNS_HMAC_?</code>).
* @param key the key.
* @param key_size the key size.
* @return HMAC handle or NULL on error.
*/
_getdns_tls_hmac* _getdns_tls_hmac_new(struct mem_funcs* mfs, int algorithm, const void* key, size_t key_size);
/**
* Add data to a HMAC.
*
* @param h the HMAC.
* @param data the data to add.
* @param data_size the size of data to add.
* @return GETDNS_RETURN_GOOD if added.
* @return GETDNS_RETURN_INVALID_PARAMETER if h is null or has no HMAC.
* @return GETDNS_RETURN_GENERIC_ERROR on error.
*/
getdns_return_t _getdns_tls_hmac_add(_getdns_tls_hmac* h, const void* data, size_t data_size);
/**
* Return the HMAC digest and free the handle.
*
* @param mfs pointer to getdns memory functions.
* @param h the HMAC.
* @param output_size the output size will be written here if not NULL.
* @return output malloc'd buffer with output, NULL on error.
*/
unsigned char* _getdns_tls_hmac_end(struct mem_funcs* mfs, _getdns_tls_hmac* h, size_t* output_size);
/**
* Calculate a SHA1 hash.
*