diff options
| -rw-r--r-- | libcli/smb/smb2_signing.c | 76 |
1 files changed, 58 insertions, 18 deletions
diff --git a/libcli/smb/smb2_signing.c b/libcli/smb/smb2_signing.c index 62a5ade043..4204ed1f85 100644 --- a/libcli/smb/smb2_signing.c +++ b/libcli/smb/smb2_signing.c @@ -30,8 +30,7 @@ NTSTATUS smb2_signing_sign_pdu(DATA_BLOB signing_key, { uint8_t *hdr; uint64_t session_id; - struct HMACSHA256Context m; - uint8_t res[SHA256_DIGEST_LENGTH]; + uint8_t res[16]; int i; if (count < 2) { @@ -63,13 +62,33 @@ NTSTATUS smb2_signing_sign_pdu(DATA_BLOB signing_key, SIVAL(hdr, SMB2_HDR_FLAGS, IVAL(hdr, SMB2_HDR_FLAGS) | SMB2_HDR_FLAG_SIGNED); - ZERO_STRUCT(m); - hmac_sha256_init(signing_key.data, MIN(signing_key.length, 16), &m); - for (i=0; i < count; i++) { - hmac_sha256_update((const uint8_t *)vector[i].iov_base, - vector[i].iov_len, &m); + if (protocol >= PROTOCOL_SMB2_24) { + struct aes_cmac_128_context ctx; + uint8_t key[AES_BLOCK_SIZE]; + + ZERO_STRUCT(key); + memcpy(key, signing_key.data, MIN(signing_key.length, 16)); + + aes_cmac_128_init(&ctx, key); + for (i=0; i < count; i++) { + aes_cmac_128_update(&ctx, + (const uint8_t *)vector[i].iov_base, + vector[i].iov_len); + } + aes_cmac_128_final(&ctx, res); + } else { + struct HMACSHA256Context m; + uint8_t digest[SHA256_DIGEST_LENGTH]; + + ZERO_STRUCT(m); + hmac_sha256_init(signing_key.data, MIN(signing_key.length, 16), &m); + for (i=0; i < count; i++) { + hmac_sha256_update((const uint8_t *)vector[i].iov_base, + vector[i].iov_len, &m); + } + hmac_sha256_final(digest, &m); + memcpy(res, digest, 16); } - hmac_sha256_final(res, &m); DEBUG(5,("signed SMB2 message\n")); memcpy(hdr + SMB2_HDR_SIGNATURE, res, 16); @@ -85,8 +104,7 @@ NTSTATUS smb2_signing_check_pdu(DATA_BLOB signing_key, const uint8_t *hdr; const uint8_t *sig; uint64_t session_id; - struct HMACSHA256Context m; - uint8_t res[SHA256_DIGEST_LENGTH]; + uint8_t res[16]; static const uint8_t zero_sig[16] = { 0, }; int i; @@ -116,15 +134,37 @@ NTSTATUS smb2_signing_check_pdu(DATA_BLOB signing_key, sig = hdr+SMB2_HDR_SIGNATURE; - ZERO_STRUCT(m); - hmac_sha256_init(signing_key.data, MIN(signing_key.length, 16), &m); - hmac_sha256_update(hdr, SMB2_HDR_SIGNATURE, &m); - hmac_sha256_update(zero_sig, 16, &m); - for (i=1; i < count; i++) { - hmac_sha256_update((const uint8_t *)vector[i].iov_base, - vector[i].iov_len, &m); + if (protocol >= PROTOCOL_SMB2_24) { + struct aes_cmac_128_context ctx; + uint8_t key[AES_BLOCK_SIZE]; + + ZERO_STRUCT(key); + memcpy(key, signing_key.data, MIN(signing_key.length, 16)); + + aes_cmac_128_init(&ctx, key); + aes_cmac_128_update(&ctx, hdr, SMB2_HDR_SIGNATURE); + aes_cmac_128_update(&ctx, zero_sig, 16); + for (i=1; i < count; i++) { + aes_cmac_128_update(&ctx, + (const uint8_t *)vector[i].iov_base, + vector[i].iov_len); + } + aes_cmac_128_final(&ctx, res); + } else { + struct HMACSHA256Context m; + uint8_t digest[SHA256_DIGEST_LENGTH]; + + ZERO_STRUCT(m); + hmac_sha256_init(signing_key.data, MIN(signing_key.length, 16), &m); + hmac_sha256_update(hdr, SMB2_HDR_SIGNATURE, &m); + hmac_sha256_update(zero_sig, 16, &m); + for (i=1; i < count; i++) { + hmac_sha256_update((const uint8_t *)vector[i].iov_base, + vector[i].iov_len, &m); + } + hmac_sha256_final(digest, &m); + memcpy(res, digest, 16); } - hmac_sha256_final(res, &m); if (memcmp(res, sig, 16) != 0) { DEBUG(0,("Bad SMB2 signature for message\n")); |