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libcli:smb: Use gnutls_aead_cipher_encryptv2() for AES GCM or CCM

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This is a new call which has been added with GnuTLS 3.6.10 and will
recuduce memory allocations and copying of data.

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Simo Sorce <idra@samba.org>
This commit is contained in:
Andreas Schneider 2019-08-23 08:54:54 +02:00 committed by Andreas Schneider
parent fa255a36df
commit 70fdd4821a
1 changed files with 30 additions and 2 deletions
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32
libcli/smb/smb2_signing.c
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@ -392,12 +392,11 @@ NTSTATUS smb2_signing_encrypt_pdu(struct smb2_signing_key *encryption_key,
int count)
{
uint8_t *tf;
int i;
size_t a_total;
ssize_t m_total;
uint32_t iv_size = 0;
uint32_t key_size = 0;
uint32_t tag_size = 0;
size_t tag_size = 0;
uint8_t _key[16] = {0};
gnutls_cipher_algorithm_t algo = 0;
gnutls_datum_t key;
@ -479,12 +478,40 @@ NTSTATUS smb2_signing_encrypt_pdu(struct smb2_signing_key *encryption_key,
0,
16 - iv_size);
#ifdef HAVE_GNUTLS_AEAD_CIPHER_ENCRYPTV2
{
uint8_t tag[tag_size];
giovec_t auth_iov[1];
auth_iov[0] = (giovec_t) {
.iov_base = tf + SMB2_TF_NONCE,
.iov_len = a_total,
};
rc = gnutls_aead_cipher_encryptv2(encryption_key->cipher_hnd,
iv.data,
iv.size,
auth_iov,
1,
&vector[1],
count - 1,
tag,
&tag_size);
if (rc < 0) {
status = gnutls_error_to_ntstatus(rc, NT_STATUS_INTERNAL_ERROR);
goto out;
}
memcpy(tf + SMB2_TF_SIGNATURE, tag, tag_size);
}
#else /* HAVE_GNUTLS_AEAD_CIPHER_ENCRYPTV2 */
{
size_t ptext_size = m_total;
uint8_t *ptext = NULL;
size_t ctext_size = m_total + tag_size;
uint8_t *ctext = NULL;
size_t len = 0;
int i;
ptext = talloc_size(talloc_tos(), ptext_size);
if (ptext == NULL) {
@ -543,6 +570,7 @@ NTSTATUS smb2_signing_encrypt_pdu(struct smb2_signing_key *encryption_key,
TALLOC_FREE(ptext);
TALLOC_FREE(ctext);
}
#endif /* HAVE_GNUTLS_AEAD_CIPHER_ENCRYPTV2 */
DBG_INFO("Enencrypted SMB2 message\n");