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https://github.com/samba-team/samba.git
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5b0ab386cb
Samba's NTLMSSP code is now fully talloc based, which should go a long
way to cleaning up the memory leaks in this code. This also avoids a
lot of extra copies of data, as we now allocate the 'return' blobs on
a caller-supplied context.
I have also been doing a lot of work towards NTLM2 signing and
sealing. I have this working for sealing, but not for the verifier
(MD5 integrity check on the stream) which is still incorrect.
(I can aim a rpcecho sinkdata from a Win2k3 box to my server, and the
data arrives intact, but the signature check fails. It does however
match the test values I have...).
The new torture test is cludged in - when we get a unit test suite
back, I'll happliy put it in the 'right' place....
Andrew Bartlett
(This used to be commit 399e2e2b11)
313 lines
8.0 KiB
C
313 lines
8.0 KiB
C
/*
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Unix SMB/CIFS implementation.
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schannel library code
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Copyright (C) Andrew Tridgell 2004
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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/*******************************************************************
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Encode or Decode the sequence number (which is symmetric)
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********************************************************************/
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static void netsec_deal_with_seq_num(struct schannel_state *state,
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const uchar packet_digest[8],
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uchar seq_num[8])
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{
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static const uchar zeros[4];
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uchar sequence_key[16];
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uchar digest1[16];
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hmac_md5(state->session_key, zeros, sizeof(zeros), digest1);
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hmac_md5(digest1, packet_digest, 8, sequence_key);
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SamOEMhash(seq_num, sequence_key, 8);
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state->seq_num++;
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}
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/*******************************************************************
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Calculate the key with which to encode the data payload
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********************************************************************/
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static void netsec_get_sealing_key(const uchar session_key[16],
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const uchar seq_num[8],
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uchar sealing_key[16])
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{
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static const uchar zeros[4];
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uchar digest2[16];
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uchar sess_kf0[16];
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int i;
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for (i = 0; i < 16; i++) {
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sess_kf0[i] = session_key[i] ^ 0xf0;
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}
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hmac_md5(sess_kf0, zeros, 4, digest2);
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hmac_md5(digest2, seq_num, 8, sealing_key);
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}
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/*******************************************************************
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Create a digest over the entire packet (including the data), and
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MD5 it with the session key.
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********************************************************************/
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static void schannel_digest(const uchar sess_key[16],
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const uchar netsec_sig[8],
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const uchar *confounder,
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const uchar *data, size_t data_len,
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uchar digest_final[16])
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{
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uchar packet_digest[16];
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static const uchar zeros[4];
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struct MD5Context ctx;
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MD5Init(&ctx);
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MD5Update(&ctx, zeros, 4);
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MD5Update(&ctx, netsec_sig, 8);
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if (confounder) {
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MD5Update(&ctx, confounder, 8);
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}
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MD5Update(&ctx, data, data_len);
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MD5Final(packet_digest, &ctx);
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hmac_md5(sess_key, packet_digest, sizeof(packet_digest), digest_final);
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}
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/*
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unseal a packet
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*/
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NTSTATUS schannel_unseal_packet(struct schannel_state *state,
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TALLOC_CTX *mem_ctx,
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uchar *data, size_t length,
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DATA_BLOB *sig)
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{
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uchar digest_final[16];
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uchar confounder[8];
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uchar seq_num[8];
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uchar sealing_key[16];
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static const uchar netsec_sig[8] = NETSEC_SEAL_SIGNATURE;
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if (sig->length != 32) {
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return NT_STATUS_ACCESS_DENIED;
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}
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memcpy(confounder, sig->data+24, 8);
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RSIVAL(seq_num, 0, state->seq_num);
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SIVAL(seq_num, 4, state->initiator?0:0x80);
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netsec_get_sealing_key(state->session_key, seq_num, sealing_key);
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SamOEMhash(confounder, sealing_key, 8);
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SamOEMhash(data, sealing_key, length);
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schannel_digest(state->session_key,
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netsec_sig, confounder,
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data, length, digest_final);
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if (memcmp(digest_final, sig->data+16, 8) != 0) {
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dump_data_pw("calc digest:", digest_final, 8);
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dump_data_pw("wire digest:", sig->data+16, 8);
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return NT_STATUS_ACCESS_DENIED;
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}
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netsec_deal_with_seq_num(state, digest_final, seq_num);
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if (memcmp(seq_num, sig->data+8, 8) != 0) {
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dump_data_pw("calc seq num:", seq_num, 8);
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dump_data_pw("wire seq num:", sig->data+8, 8);
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return NT_STATUS_ACCESS_DENIED;
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}
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return NT_STATUS_OK;
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}
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/*
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check the signature on a packet
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*/
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NTSTATUS schannel_check_packet(struct schannel_state *state,
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const uchar *data, size_t length,
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const DATA_BLOB *sig)
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{
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uchar digest_final[16];
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uchar seq_num[8];
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static const uchar netsec_sig[8] = NETSEC_SIGN_SIGNATURE;
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if (sig->length != 32) {
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return NT_STATUS_ACCESS_DENIED;
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}
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RSIVAL(seq_num, 0, state->seq_num);
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SIVAL(seq_num, 4, state->initiator?0:0x80);
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dump_data_pw("seq_num:\n", seq_num, 8);
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dump_data_pw("sess_key:\n", state->session_key, 16);
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schannel_digest(state->session_key,
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netsec_sig, NULL,
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data, length, digest_final);
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netsec_deal_with_seq_num(state, digest_final, seq_num);
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if (memcmp(seq_num, sig->data+8, 8) != 0) {
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dump_data_pw("calc seq num:", seq_num, 8);
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dump_data_pw("wire seq num:", sig->data+8, 8);
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return NT_STATUS_ACCESS_DENIED;
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}
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if (memcmp(digest_final, sig->data+16, 8) != 0) {
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dump_data_pw("calc digest:", digest_final, 8);
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dump_data_pw("wire digest:", sig->data+16, 8);
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return NT_STATUS_ACCESS_DENIED;
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}
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return NT_STATUS_OK;
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}
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/*
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seal a packet
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*/
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NTSTATUS schannel_seal_packet(struct schannel_state *state,
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TALLOC_CTX *mem_ctx,
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uchar *data, size_t length,
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DATA_BLOB *sig)
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{
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uchar digest_final[16];
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uchar confounder[8];
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uchar seq_num[8];
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uchar sealing_key[16];
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static const uchar netsec_sig[8] = NETSEC_SEAL_SIGNATURE;
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generate_random_buffer(confounder, 8, False);
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RSIVAL(seq_num, 0, state->seq_num);
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SIVAL(seq_num, 4, state->initiator?0x80:0);
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schannel_digest(state->session_key,
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netsec_sig, confounder,
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data, length, digest_final);
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netsec_get_sealing_key(state->session_key, seq_num, sealing_key);
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SamOEMhash(confounder, sealing_key, 8);
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SamOEMhash(data, sealing_key, length);
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netsec_deal_with_seq_num(state, digest_final, seq_num);
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if (!state->signature.data) {
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state->signature = data_blob_talloc(mem_ctx, NULL, 32);
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if (!state->signature.data) {
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return NT_STATUS_NO_MEMORY;
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}
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}
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(*sig) = state->signature;
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memcpy(sig->data, netsec_sig, 8);
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memcpy(sig->data+8, seq_num, 8);
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memcpy(sig->data+16, digest_final, 8);
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memcpy(sig->data+24, confounder, 8);
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dump_data_pw("signature:", sig->data+ 0, 8);
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dump_data_pw("seq_num :", sig->data+ 8, 8);
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dump_data_pw("digest :", sig->data+16, 8);
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dump_data_pw("confound :", sig->data+24, 8);
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return NT_STATUS_OK;
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}
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/*
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sign a packet
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*/
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NTSTATUS schannel_sign_packet(struct schannel_state *state,
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TALLOC_CTX *mem_ctx,
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const uchar *data, size_t length,
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DATA_BLOB *sig)
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{
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uchar digest_final[16];
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uchar seq_num[8];
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static const uchar netsec_sig[8] = NETSEC_SIGN_SIGNATURE;
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RSIVAL(seq_num, 0, state->seq_num);
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SIVAL(seq_num, 4, state->initiator?0x80:0);
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schannel_digest(state->session_key,
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netsec_sig, NULL,
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data, length, digest_final);
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netsec_deal_with_seq_num(state, digest_final, seq_num);
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if (!state->signature.data) {
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state->signature = data_blob_talloc(mem_ctx, NULL, 32);
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if (!state->signature.data) {
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return NT_STATUS_NO_MEMORY;
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}
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}
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(*sig) = state->signature;
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memcpy(sig->data, netsec_sig, 8);
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memcpy(sig->data+8, seq_num, 8);
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memcpy(sig->data+16, digest_final, 8);
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memset(sig->data+24, 0, 8);
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dump_data_pw("signature:", sig->data+ 0, 8);
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dump_data_pw("seq_num :", sig->data+ 8, 8);
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dump_data_pw("digest :", sig->data+16, 8);
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dump_data_pw("confound :", sig->data+24, 8);
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return NT_STATUS_OK;
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}
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/*
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destroy an schannel context
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*/
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void schannel_end(struct schannel_state **state)
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{
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talloc_destroy((*state)->mem_ctx);
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(*state) = NULL;
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}
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/*
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create an schannel context state
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*/
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NTSTATUS schannel_start(struct schannel_state **state,
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uint8 session_key[16],
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BOOL initiator)
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{
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TALLOC_CTX *mem_ctx;
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mem_ctx = talloc_init("schannel_state");
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if (!mem_ctx) {
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return NT_STATUS_NO_MEMORY;
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}
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(*state) = talloc_p(mem_ctx, struct schannel_state);
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if (!(*state)) {
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talloc_destroy(mem_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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(*state)->mem_ctx = mem_ctx;
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memcpy((*state)->session_key, session_key, 16);
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(*state)->initiator = initiator;
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(*state)->signature = data_blob(NULL, 0);
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(*state)->seq_num = 0;
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return NT_STATUS_OK;
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}
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