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libcli:smb: Use GnuTLS AES128 CMAC in smb2_signing_check_pdu()

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Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This commit is contained in:
Andreas Schneider 2019-03-15 16:58:21 +01:00 committed by Andreas Schneider
parent 9d8ffc81a5
commit 1490f92600
1 changed files with 38 additions and 0 deletions
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38
libcli/smb/smb2_signing.c
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@ -216,6 +216,43 @@ NTSTATUS smb2_signing_check_pdu(struct smb2_signing_key *signing_key,
sig = hdr+SMB2_HDR_SIGNATURE;
if (protocol >= PROTOCOL_SMB2_24) {
#ifdef HAVE_GNUTLS_AES_CMAC
gnutls_datum_t key = {
.data = signing_key->blob.data,
.size = MIN(signing_key->blob.length, 16),
};
int rc;
if (signing_key->hmac_hnd == NULL) {
rc = gnutls_hmac_init(&signing_key->hmac_hnd,
GNUTLS_MAC_AES_CMAC_128,
key.data,
key.size);
if (rc < 0) {
return NT_STATUS_NO_MEMORY;
}
}
rc = gnutls_hmac(signing_key->hmac_hnd, hdr, SMB2_HDR_SIGNATURE);
if (rc < 0) {
return NT_STATUS_INTERNAL_ERROR;
}
rc = gnutls_hmac(signing_key->hmac_hnd, zero_sig, 16);
if (rc < 0) {
return NT_STATUS_INTERNAL_ERROR;
}
for (i = 1; i < count; i++) {
rc = gnutls_hmac(signing_key->hmac_hnd,
vector[i].iov_base,
vector[i].iov_len);
if (rc < 0) {
return NT_STATUS_INTERNAL_ERROR;
}
}
gnutls_hmac_output(signing_key->hmac_hnd, res);
#else /* NOT HAVE_GNUTLS_AES_CMAC */
struct aes_cmac_128_context ctx;
uint8_t key[AES_BLOCK_SIZE] = {0};
@ -234,6 +271,7 @@ NTSTATUS smb2_signing_check_pdu(struct smb2_signing_key *signing_key,
aes_cmac_128_final(&ctx, res);
ZERO_ARRAY(key);
#endif
} else {
uint8_t digest[gnutls_hash_get_len(GNUTLS_MAC_SHA256)];
int rc;