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From 7f4ab026bdb4b276a76c8359481124ff77597a42 Mon Sep 17 00:00:00 2001
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From: Andreas Schneider <asn@samba.org>
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Date: Fri, 15 Mar 2019 16:58:21 +0100
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Subject: [PATCH 121/187] libcli:smb: Use GnuTLS AES128 CMAC in
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smb2_signing_check_pdu()
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Signed-off-by: Andreas Schneider <asn@samba.org>
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Reviewed-by: Andrew Bartlett <abartlet@samba.org>
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(cherry picked from commit 1490f9260060104b31beefac9e61addd36b1919a)
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---
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libcli/smb/smb2_signing.c | 38 ++++++++++++++++++++++++++++++++++++++
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1 file changed, 38 insertions(+)
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diff --git a/libcli/smb/smb2_signing.c b/libcli/smb/smb2_signing.c
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index 466fe9a49e3..5bf61bd477b 100644
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--- a/libcli/smb/smb2_signing.c
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+++ b/libcli/smb/smb2_signing.c
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@@ -216,6 +216,43 @@ NTSTATUS smb2_signing_check_pdu(struct smb2_signing_key *signing_key,
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sig = hdr+SMB2_HDR_SIGNATURE;
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if (protocol >= PROTOCOL_SMB2_24) {
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+#ifdef HAVE_GNUTLS_AES_CMAC
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+ gnutls_datum_t key = {
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+ .data = signing_key->blob.data,
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+ .size = MIN(signing_key->blob.length, 16),
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+ };
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+ int rc;
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+
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+ if (signing_key->hmac_hnd == NULL) {
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+ rc = gnutls_hmac_init(&signing_key->hmac_hnd,
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+ GNUTLS_MAC_AES_CMAC_128,
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+ key.data,
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+ key.size);
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+ if (rc < 0) {
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+ return NT_STATUS_NO_MEMORY;
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+ }
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+ }
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+
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+ rc = gnutls_hmac(signing_key->hmac_hnd, hdr, SMB2_HDR_SIGNATURE);
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+ if (rc < 0) {
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+ return NT_STATUS_INTERNAL_ERROR;
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+ }
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+
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+ rc = gnutls_hmac(signing_key->hmac_hnd, zero_sig, 16);
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+ if (rc < 0) {
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+ return NT_STATUS_INTERNAL_ERROR;
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+ }
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+
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+ for (i = 1; i < count; i++) {
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+ rc = gnutls_hmac(signing_key->hmac_hnd,
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+ vector[i].iov_base,
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+ vector[i].iov_len);
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+ if (rc < 0) {
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+ return NT_STATUS_INTERNAL_ERROR;
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+ }
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+ }
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+ gnutls_hmac_output(signing_key->hmac_hnd, res);
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+#else /* NOT HAVE_GNUTLS_AES_CMAC */
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struct aes_cmac_128_context ctx;
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uint8_t key[AES_BLOCK_SIZE] = {0};
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@@ -234,6 +271,7 @@ NTSTATUS smb2_signing_check_pdu(struct smb2_signing_key *signing_key,
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aes_cmac_128_final(&ctx, res);
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ZERO_ARRAY(key);
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+#endif
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} else {
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uint8_t digest[gnutls_hash_get_len(GNUTLS_MAC_SHA256)];
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int rc;
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--
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2.23.0
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