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-rw-r--r--source4/lib/crypto/config.mk2
-rw-r--r--source4/lib/crypto/crypto.h2
-rw-r--r--source4/lib/crypto/hmacsha256.c92
-rw-r--r--source4/lib/crypto/hmacsha256.h38
-rw-r--r--source4/libcli/smb2/signing.c21
5 files changed, 142 insertions, 13 deletions
diff --git a/source4/lib/crypto/config.mk b/source4/lib/crypto/config.mk
index b9a7f7cb9e..fb1c1bf6ce 100644
--- a/source4/lib/crypto/config.mk
+++ b/source4/lib/crypto/config.mk
@@ -6,7 +6,7 @@
LIBCRYPTO_OBJ_FILES = $(addprefix $(libcryptosrcdir)/, \
crc32.o md5.o hmacmd5.o md4.o \
- arcfour.o sha1.o hmacsha1.o)
+ arcfour.o sha1.o hmacsha1.o hmacsha256.o)
[MODULE::TORTURE_LIBCRYPTO]
diff --git a/source4/lib/crypto/crypto.h b/source4/lib/crypto/crypto.h
index 10e2258fa7..03a233ec98 100644
--- a/source4/lib/crypto/crypto.h
+++ b/source4/lib/crypto/crypto.h
@@ -23,6 +23,8 @@
#include "lib/crypto/hmacmd5.h"
#include "lib/crypto/sha1.h"
#include "lib/crypto/hmacsha1.h"
+#include "heimdal/lib/hcrypto/sha.h"
+#include "lib/crypto/hmacsha256.h"
struct arcfour_state {
uint8_t sbox[256];
diff --git a/source4/lib/crypto/hmacsha256.c b/source4/lib/crypto/hmacsha256.c
new file mode 100644
index 0000000000..5503bdd59b
--- /dev/null
+++ b/source4/lib/crypto/hmacsha256.c
@@ -0,0 +1,92 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ Interface header: HMAC SHA-256 code
+
+ Copyright (C) Andrew Tridgell 2008
+
+ based in hmacsha1.c which is:
+ Copyright (C) Stefan Metzmacher
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+ taken direct from rfc2202 implementation and modified for suitable use
+ */
+
+#include "includes.h"
+#include "lib/crypto/crypto.h"
+#include "heimdal/lib/hcrypto/sha.h"
+
+/***********************************************************************
+ the rfc 2104/2202 version of hmac_sha256 initialisation.
+***********************************************************************/
+_PUBLIC_ void hmac_sha256_init(const uint8_t *key, size_t key_len, struct HMACSHA256Context *ctx)
+{
+ int i;
+ uint8_t tk[SHA256_DIGEST_LENGTH];
+
+ /* if key is longer than 64 bytes reset it to key=HASH(key) */
+ if (key_len > 64)
+ {
+ SHA256_CTX tctx;
+
+ SHA256_Init(&tctx);
+ SHA256_Update(&tctx, key, key_len);
+ SHA256_Final(tk, &tctx);
+
+ key = tk;
+ key_len = SHA256_DIGEST_LENGTH;
+ }
+
+ /* start out by storing key in pads */
+ ZERO_STRUCT(ctx->k_ipad);
+ ZERO_STRUCT(ctx->k_opad);
+ memcpy( ctx->k_ipad, key, key_len);
+ memcpy( ctx->k_opad, key, key_len);
+
+ /* XOR key with ipad and opad values */
+ for (i=0; i<64; i++)
+ {
+ ctx->k_ipad[i] ^= 0x36;
+ ctx->k_opad[i] ^= 0x5c;
+ }
+
+ SHA256_Init(&ctx->ctx);
+ SHA256_Update(&ctx->ctx, ctx->k_ipad, 64);
+}
+
+/***********************************************************************
+ update hmac_sha256 "inner" buffer
+***********************************************************************/
+_PUBLIC_ void hmac_sha256_update(const uint8_t *data, size_t data_len, struct HMACSHA256Context *ctx)
+{
+ SHA256_Update(&ctx->ctx, data, data_len); /* then text of datagram */
+}
+
+/***********************************************************************
+ finish off hmac_sha256 "inner" buffer and generate outer one.
+***********************************************************************/
+_PUBLIC_ void hmac_sha256_final(uint8_t digest[SHA256_DIGEST_LENGTH], struct HMACSHA256Context *ctx)
+{
+ SHA256_CTX ctx_o;
+
+ SHA256_Final(digest, &ctx->ctx);
+
+ SHA256_Init(&ctx_o);
+ SHA256_Update(&ctx_o, ctx->k_opad, 64);
+ SHA256_Update(&ctx_o, digest, SHA256_DIGEST_LENGTH);
+ SHA256_Final(digest, &ctx_o);
+}
diff --git a/source4/lib/crypto/hmacsha256.h b/source4/lib/crypto/hmacsha256.h
new file mode 100644
index 0000000000..8960c636c1
--- /dev/null
+++ b/source4/lib/crypto/hmacsha256.h
@@ -0,0 +1,38 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ Interface header: HMAC SHA256 code
+
+ Copyright (C) Andrew Tridgell 2008
+
+ based on hmacsha1.h which is:
+
+ Copyright (C) Stefan Metzmacher 2006
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _HMAC_SHA256_H
+
+struct HMACSHA256Context {
+ SHA256_CTX ctx;
+ uint8_t k_ipad[65];
+ uint8_t k_opad[65];
+};
+
+void hmac_sha256_init(const uint8_t *key, size_t key_len, struct HMACSHA256Context *ctx);
+void hmac_sha256_update(const uint8_t *data, size_t data_len, struct HMACSHA256Context *ctx);
+void hmac_sha256_final(uint8_t digest[20], struct HMACSHA256Context *ctx);
+
+#endif /* _HMAC_SHA256_H */
diff --git a/source4/libcli/smb2/signing.c b/source4/libcli/smb2/signing.c
index 01f7576134..16c0ff99c1 100644
--- a/source4/libcli/smb2/signing.c
+++ b/source4/libcli/smb2/signing.c
@@ -23,7 +23,7 @@
#include "libcli/raw/libcliraw.h"
#include "libcli/smb2/smb2.h"
#include "libcli/smb2/smb2_calls.h"
-#include "heimdal/lib/hcrypto/sha.h"
+#include "lib/crypto/crypto.h"
/*
NOTE: this code does not yet interoperate with the windows SMB2
@@ -54,7 +54,7 @@ NTSTATUS smb2_sign_message(struct smb2_request *req)
{
struct smb2_request_buffer *buf = &req->out;
uint64_t session_id;
- SHA256_CTX m;
+ struct HMACSHA256Context m;
uint8_t res[32];
if (!req->transport->signing.doing_signing ||
@@ -85,11 +85,9 @@ NTSTATUS smb2_sign_message(struct smb2_request *req)
SIVAL(buf->hdr, SMB2_HDR_FLAGS, IVAL(buf->hdr, SMB2_HDR_FLAGS) | SMB2_HDR_FLAG_SIGNED);
ZERO_STRUCT(m);
- SHA256_Init(&m);
- SHA256_Update(&m, req->transport->signing.session_key.data,
- req->transport->signing.session_key.length);
- SHA256_Update(&m, buf->buffer+NBT_HDR_SIZE, buf->size-NBT_HDR_SIZE);
- SHA256_Final(res, &m);
+ hmac_sha256_init(req->transport->signing.session_key.data, 16, &m);
+ hmac_sha256_update(buf->buffer+NBT_HDR_SIZE, buf->size-NBT_HDR_SIZE, &m);
+ hmac_sha256_final(res, &m);
DEBUG(5,("signed SMB2 message of size %u\n", (unsigned)buf->size - NBT_HDR_SIZE));
@@ -110,7 +108,7 @@ NTSTATUS smb2_check_signature(struct smb2_transport *transport,
uint8_t *buffer, uint_t length)
{
uint64_t session_id;
- SHA256_CTX m;
+ struct HMACSHA256Context m;
uint8_t res[SHA256_DIGEST_LENGTH];
uint8_t sig[16];
@@ -147,10 +145,9 @@ NTSTATUS smb2_check_signature(struct smb2_transport *transport,
memset(buffer + NBT_HDR_SIZE + SMB2_HDR_SIGNATURE, 0, 16);
ZERO_STRUCT(m);
- SHA256_Init(&m);
- SHA256_Update(&m, transport->signing.session_key.data, 16);
- SHA256_Update(&m, buffer+NBT_HDR_SIZE, length-NBT_HDR_SIZE);
- SHA256_Final(res, &m);
+ hmac_sha256_init(transport->signing.session_key.data, 16, &m);
+ hmac_sha256_update(buffer+NBT_HDR_SIZE, length-NBT_HDR_SIZE, &m);
+ hmac_sha256_final(res, &m);
memcpy(buffer+NBT_HDR_SIZE+SMB2_HDR_SIGNATURE, sig, 16);
generated by cgit (git 2.34.1) at 2024-11-23 23:19:06 +0000