s3:libsmb: rename smb_signing.c => clisigning.c

This prepares a large simplification of the smb_signing code

metze

1 files changed, 0 insertions, 1006 deletions

diff --git a/source3/libsmb/smb_signing.c b/source3/libsmb/smb_signing.c
deleted file mode 100644
index a3ed0e7572..0000000000
--- a/source3/libsmb/smb_signing.c
+++ /dev/null
@@ -1,1006 +0,0 @@
-/* 
-   Unix SMB/CIFS implementation.
-   SMB Signing Code
-   Copyright (C) Jeremy Allison 2003.
-   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
-
-   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/>.
-*/
-
-#include "includes.h"
-
-/* Lookup a packet's MID (multiplex id) and figure out it's sequence number */
-struct outstanding_packet_lookup {
-	struct outstanding_packet_lookup *prev, *next;
-	uint16 mid;
-	uint32 reply_seq_num;
-	bool can_delete; /* Set to False in trans state. */
-};
-
-struct smb_basic_signing_context {
-	DATA_BLOB mac_key;
-	uint32 send_seq_num;
-	struct outstanding_packet_lookup *outstanding_packet_list;
-};
-
-static bool store_sequence_for_reply(struct outstanding_packet_lookup **list, 
-				     uint16 mid, uint32 reply_seq_num)
-{
-	struct outstanding_packet_lookup *t;
-
-	/* Ensure we only add a mid once. */
-	for (t = *list; t; t = t->next) {
-		if (t->mid == mid) {
-			return False;
-		}
-	}
-
-	t = SMB_XMALLOC_P(struct outstanding_packet_lookup);
-	ZERO_STRUCTP(t);
-
-	t->mid = mid;
-	t->reply_seq_num = reply_seq_num;
-	t->can_delete = True;
-
-	/*
-	 * Add to the *start* of the list not the end of the list.
-	 * This ensures that the *last* send sequence with this mid
-	 * is returned by preference.
-	 * This can happen if the mid wraps and one of the early
-	 * mid numbers didn't get a reply and is still lurking on
-	 * the list. JRA. Found by Fran Fabrizio <fran@cis.uab.edu>.
-	 */
-
-	DLIST_ADD(*list, t);
-	DEBUG(10,("store_sequence_for_reply: stored seq = %u mid = %u\n",
-			(unsigned int)reply_seq_num, (unsigned int)mid ));
-	return True;
-}
-
-static bool get_sequence_for_reply(struct outstanding_packet_lookup **list,
-				   uint16 mid, uint32 *reply_seq_num)
-{
-	struct outstanding_packet_lookup *t;
-
-	for (t = *list; t; t = t->next) {
-		if (t->mid == mid) {
-			*reply_seq_num = t->reply_seq_num;
-			DEBUG(10,("get_sequence_for_reply: found seq = %u mid = %u\n",
-				(unsigned int)t->reply_seq_num, (unsigned int)t->mid ));
-			if (t->can_delete) {
-				DLIST_REMOVE(*list, t);
-				SAFE_FREE(t);
-			}
-			return True;
-		}
-	}
-	return False;
-}
-
-static bool set_sequence_can_delete_flag(struct outstanding_packet_lookup **list, uint16 mid, bool can_delete_entry)
-{
-	struct outstanding_packet_lookup *t;
-
-	for (t = *list; t; t = t->next) {
-		if (t->mid == mid) {
-			t->can_delete = can_delete_entry;
-			return True;
-		}
-	}
-	return False;
-}
-
-/***********************************************************
- SMB signing - Common code before we set a new signing implementation
-************************************************************/
-
-static bool cli_set_smb_signing_common(struct cli_state *cli) 
-{
-	if (!cli->sign_info.allow_smb_signing) {
-		return False;
-	}
-
-	if (!cli->sign_info.negotiated_smb_signing 
-	    && !cli->sign_info.mandatory_signing) {
-		return False;
-	}
-
-	if (cli->sign_info.doing_signing) {
-		return False;
-	}
-
-	if (cli->sign_info.free_signing_context)
-		cli->sign_info.free_signing_context(&cli->sign_info);
-
-	/* These calls are INCOMPATIBLE with SMB signing */
-	cli->readbraw_supported = False;
-	cli->writebraw_supported = False;
-
-	return True;
-}
-
-/***********************************************************
- SMB signing - Common code for 'real' implementations
-************************************************************/
-
-static bool set_smb_signing_real_common(struct smb_sign_info *si)
-{
-	if (si->mandatory_signing) {
-		DEBUG(5, ("Mandatory SMB signing enabled!\n"));
-	}
-
-	si->doing_signing = True;
-	DEBUG(5, ("SMB signing enabled!\n"));
-
-	return True;
-}
-
-static void mark_packet_signed(char *outbuf)
-{
-	uint16 flags2;
-	flags2 = SVAL(outbuf,smb_flg2);
-	flags2 |= FLAGS2_SMB_SECURITY_SIGNATURES;
-	SSVAL(outbuf,smb_flg2, flags2);
-}
-
-/***********************************************************
- SMB signing - NULL implementation - calculate a MAC to send.
-************************************************************/
-
-static void null_sign_outgoing_message(char *outbuf, struct smb_sign_info *si)
-{
-	/* we can't zero out the sig, as we might be trying to send a
-	   session request - which is NBT-level, not SMB level and doesn't
-	   have the field */
-	return;
-}
-
-/***********************************************************
- SMB signing - NULL implementation - check a MAC sent by server.
-************************************************************/
-
-static bool null_check_incoming_message(const char *inbuf,
-					struct smb_sign_info *si,
-					bool must_be_ok)
-{
-	return True;
-}
-
-/***********************************************************
- SMB signing - NULL implementation - free signing context
-************************************************************/
-
-static void null_free_signing_context(struct smb_sign_info *si)
-{
-	return;
-}
-
-/**
- SMB signing - NULL implementation - setup the MAC key.
-
- @note Used as an initialisation only - it will not correctly
-       shut down a real signing mechanism
-*/
-
-static bool null_set_signing(struct smb_sign_info *si)
-{
-	si->signing_context = NULL;
-
-	si->sign_outgoing_message = null_sign_outgoing_message;
-	si->check_incoming_message = null_check_incoming_message;
-	si->free_signing_context = null_free_signing_context;
-
-	return True;
-}
-
-/**
- * Free the signing context
- */
-
-static void free_signing_context(struct smb_sign_info *si)
-{
-	if (si->free_signing_context) {
-		si->free_signing_context(si);
-		si->signing_context = NULL;
-	}
-
-	null_set_signing(si);
-}
-
-
-static bool signing_good(const char *inbuf, struct smb_sign_info *si,
-			 bool good, uint32 seq, bool must_be_ok)
-{
-	if (good) {
-
-		if (!si->doing_signing) {
-			si->doing_signing = True;
-		}
-
-		if (!si->seen_valid) {
-			si->seen_valid = True;
-		}
-
-	} else {
-		if (!si->mandatory_signing && !si->seen_valid) {
-
-			if (!must_be_ok) {
-				return True;
-			}
-			/* Non-mandatory signing - just turn off if this is the first bad packet.. */
-			DEBUG(5, ("srv_check_incoming_message: signing negotiated but not required and peer\n"
-				  "isn't sending correct signatures. Turning off.\n"));
-			si->negotiated_smb_signing = False;
-			si->allow_smb_signing = False;
-			si->doing_signing = False;
-			free_signing_context(si);
-			return True;
-		} else if (!must_be_ok) {
-			/* This packet is known to be unsigned */
-			return True;
-		} else {
-			/* Mandatory signing or bad packet after signing started - fail and disconnect. */
-			if (seq)
-				DEBUG(0, ("signing_good: BAD SIG: seq %u\n", (unsigned int)seq));
-			return False;
-		}
-	}
-	return True;
-}	
-
-/***********************************************************
- SMB signing - Simple implementation - calculate a MAC on the packet
-************************************************************/
-
-static void simple_packet_signature(struct smb_basic_signing_context *data, 
-				    const uchar *buf, uint32 seq_number, 
-				    unsigned char calc_md5_mac[16])
-{
-	const size_t offset_end_of_sig = (smb_ss_field + 8);
-	unsigned char sequence_buf[8];
-	struct MD5Context md5_ctx;
-#if 0
-        /* JRA - apparently this is incorrect. */
-	unsigned char key_buf[16];
-#endif
-
-	/*
-	 * Firstly put the sequence number into the first 4 bytes.
-	 * and zero out the next 4 bytes.
-	 *
-	 * We do this here, to avoid modifying the packet.
-	 */
-
-	DEBUG(10,("simple_packet_signature: sequence number %u\n", seq_number ));
-
-	SIVAL(sequence_buf, 0, seq_number);
-	SIVAL(sequence_buf, 4, 0);
-
-	/* Calculate the 16 byte MAC - but don't alter the data in the
-	   incoming packet.
-
-	   This makes for a bit of fussing about, but it's not too bad.
-	*/
-	MD5Init(&md5_ctx);
-
-	/* intialise with the key */
-	MD5Update(&md5_ctx, data->mac_key.data, data->mac_key.length); 
-#if 0
-	/* JRA - apparently this is incorrect. */
-	/* NB. When making and verifying SMB signatures, Windows apparently
-		zero-pads the key to 128 bits if it isn't long enough.
-		From Nalin Dahyabhai <nalin@redhat.com> */
-	if (data->mac_key.length < sizeof(key_buf)) {
-		memset(key_buf, 0, sizeof(key_buf));
-		MD5Update(&md5_ctx, key_buf, sizeof(key_buf) - data->mac_key.length);
-	}
-#endif
-
-	/* copy in the first bit of the SMB header */
-	MD5Update(&md5_ctx, buf + 4, smb_ss_field - 4);
-
-	/* copy in the sequence number, instead of the signature */
-	MD5Update(&md5_ctx, sequence_buf, sizeof(sequence_buf));
-
-	/* copy in the rest of the packet in, skipping the signature */
-	MD5Update(&md5_ctx, buf + offset_end_of_sig, 
-		  smb_len(buf) - (offset_end_of_sig - 4));
-
-	/* calculate the MD5 sig */ 
-	MD5Final(calc_md5_mac, &md5_ctx);
-}
-
-
-/***********************************************************
- SMB signing - Client implementation - send the MAC.
-************************************************************/
-
-static void client_sign_outgoing_message(char *outbuf, struct smb_sign_info *si)
-{
-	unsigned char calc_md5_mac[16];
-	struct smb_basic_signing_context *data =
-		(struct smb_basic_signing_context *)si->signing_context;
-
-	if (!si->doing_signing)
-		return;
-
-	/* JRA Paranioa test - we should be able to get rid of this... */
-	if (smb_len(outbuf) < (smb_ss_field + 8 - 4)) {
-		DEBUG(1, ("client_sign_outgoing_message: Logic error. Can't check signature on short packet! smb_len = %u\n",
-					smb_len(outbuf) ));
-		abort();
-	}
-
-	/* mark the packet as signed - BEFORE we sign it...*/
-	mark_packet_signed(outbuf);
-
-	simple_packet_signature(data, (const unsigned char *)outbuf,
-				data->send_seq_num, calc_md5_mac);
-
-	DEBUG(10, ("client_sign_outgoing_message: sent SMB signature of\n"));
-	dump_data(10, calc_md5_mac, 8);
-
-	memcpy(&outbuf[smb_ss_field], calc_md5_mac, 8);
-
-/*	cli->outbuf[smb_ss_field+2]=0; 
-	Uncomment this to test if the remote server actually verifies signatures...*/
-
-	/* Instead of re-introducing the trans_info_conect we
-	   used to have here, we use the fact that during a
-	   SMBtrans/SMBtrans2/SMBnttrans send that the mid stays
-	   constant. This means that calling store_sequence_for_reply()
-	   will return False for all trans secondaries, as the mid is already
-	   on the stored sequence list. As the send_seqence_number must
-	   remain constant for all primary+secondary trans sends, we
-	   only increment the send sequence number when we successfully
-	   add a new entry to the outstanding sequence list. This means
-	   I can isolate the fix here rather than re-adding the trans
-	   signing on/off calls in libsmb/clitrans2.c JRA.
-	 */
-
-	if (store_sequence_for_reply(&data->outstanding_packet_list, SVAL(outbuf,smb_mid), data->send_seq_num + 1)) {
-		data->send_seq_num += 2;
-	}
-}
-
-/***********************************************************
- SMB signing - Client implementation - check a MAC sent by server.
-************************************************************/
-
-static bool client_check_incoming_message(const char *inbuf,
-					  struct smb_sign_info *si,
-					  bool must_be_ok)
-{
-	bool good;
-	uint32 reply_seq_number;
-	unsigned char calc_md5_mac[16];
-	unsigned char *server_sent_mac;
-
-	struct smb_basic_signing_context *data =
-		(struct smb_basic_signing_context *)si->signing_context;
-
-	if (!si->doing_signing)
-		return True;
-
-	if (smb_len(inbuf) < (smb_ss_field + 8 - 4)) {
-		DEBUG(1, ("client_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf)));
-		return False;
-	}
-
-	if (!get_sequence_for_reply(&data->outstanding_packet_list, SVAL(inbuf, smb_mid), &reply_seq_number)) {
-		DEBUG(1, ("client_check_incoming_message: received message "
-			"with mid %u with no matching send record.\n", (unsigned int)SVAL(inbuf, smb_mid) ));
-		return False;
-	}
-
-	simple_packet_signature(data, (const unsigned char *)inbuf,
-				reply_seq_number, calc_md5_mac);
-
-	server_sent_mac = (unsigned char *)&inbuf[smb_ss_field];
-	good = (memcmp(server_sent_mac, calc_md5_mac, 8) == 0);
-
-	if (!good) {
-		DEBUG(5, ("client_check_incoming_message: BAD SIG: wanted SMB signature of\n"));
-		dump_data(5, calc_md5_mac, 8);
-
-		DEBUG(5, ("client_check_incoming_message: BAD SIG: got SMB signature of\n"));
-		dump_data(5, server_sent_mac, 8);
-#if 1 /* JRATEST */
-		{
-			int i;
-			for (i = -5; i < 5; i++) {
-				simple_packet_signature(data, (const unsigned char *)inbuf, reply_seq_number+i, calc_md5_mac);
-				if (memcmp(server_sent_mac, calc_md5_mac, 8) == 0) {
-					DEBUG(0,("client_check_incoming_message: out of seq. seq num %u matches. \
-We were expecting seq %u\n", reply_seq_number+i, reply_seq_number ));
-					break;
-				}
-			}
-		}
-#endif /* JRATEST */
-
-	} else {
-		DEBUG(10, ("client_check_incoming_message: seq %u: got good SMB signature of\n", (unsigned int)reply_seq_number));
-		dump_data(10, server_sent_mac, 8);
-	}
-	return signing_good(inbuf, si, good, reply_seq_number, must_be_ok);
-}
-
-/***********************************************************
- SMB signing - Simple implementation - free signing context
-************************************************************/
-
-static void simple_free_signing_context(struct smb_sign_info *si)
-{
-	struct smb_basic_signing_context *data =
-		(struct smb_basic_signing_context *)si->signing_context;
-	struct outstanding_packet_lookup *list;
-	struct outstanding_packet_lookup *next;
-
-	for (list = data->outstanding_packet_list; list; list = next) {
-		next = list->next;
-		DLIST_REMOVE(data->outstanding_packet_list, list);
-		SAFE_FREE(list);
-	}
-
-	data_blob_free(&data->mac_key);
-
-	SAFE_FREE(si->signing_context);
-
-	return;
-}
-
-/***********************************************************
- SMB signing - Simple implementation - setup the MAC key.
-************************************************************/
-
-bool cli_simple_set_signing(struct cli_state *cli,
-			    const DATA_BLOB user_session_key,
-			    const DATA_BLOB response)
-{
-	struct smb_basic_signing_context *data;
-
-	if (!user_session_key.length)
-		return False;
-
-	if (!cli_set_smb_signing_common(cli)) {
-		return False;
-	}
-
-	if (!set_smb_signing_real_common(&cli->sign_info)) {
-		return False;
-	}
-
-	data = SMB_XMALLOC_P(struct smb_basic_signing_context);
-	memset(data, '\0', sizeof(*data));
-
-	cli->sign_info.signing_context = data;
-
-	data->mac_key = data_blob(NULL, response.length + user_session_key.length);
-
-	memcpy(&data->mac_key.data[0], user_session_key.data, user_session_key.length);
-
-	DEBUG(10, ("cli_simple_set_signing: user_session_key\n"));
-	dump_data(10, user_session_key.data, user_session_key.length);
-
-	if (response.length) {
-		memcpy(&data->mac_key.data[user_session_key.length],response.data, response.length);
-		DEBUG(10, ("cli_simple_set_signing: response_data\n"));
-		dump_data(10, response.data, response.length);
-	} else {
-		DEBUG(10, ("cli_simple_set_signing: NULL response_data\n"));
-	}
-
-	dump_data_pw("MAC ssession key is:\n", data->mac_key.data, data->mac_key.length);
-
-	/* Initialise the sequence number */
-	data->send_seq_num = 0;
-
-	/* Initialise the list of outstanding packets */
-	data->outstanding_packet_list = NULL;
-
-	cli->sign_info.sign_outgoing_message = client_sign_outgoing_message;
-	cli->sign_info.check_incoming_message = client_check_incoming_message;
-	cli->sign_info.free_signing_context = simple_free_signing_context;
-
-	return True;
-}
-
-/***********************************************************
- SMB signing - TEMP implementation - calculate a MAC to send.
-************************************************************/
-
-static void temp_sign_outgoing_message(char *outbuf, struct smb_sign_info *si)
-{
-	/* mark the packet as signed - BEFORE we sign it...*/
-	mark_packet_signed(outbuf);
-
-	/* I wonder what BSRSPYL stands for - but this is what MS 
-	   actually sends! */
-	memcpy(&outbuf[smb_ss_field], "BSRSPYL ", 8);
-	return;
-}
-
-/***********************************************************
- SMB signing - TEMP implementation - check a MAC sent by server.
-************************************************************/
-
-static bool temp_check_incoming_message(const char *inbuf,
-					struct smb_sign_info *si, bool foo)
-{
-	return True;
-}
-
-/***********************************************************
- SMB signing - TEMP implementation - free signing context
-************************************************************/
-
-static void temp_free_signing_context(struct smb_sign_info *si)
-{
-	return;
-}
-
-/***********************************************************
- SMB signing - NULL implementation - setup the MAC key.
-************************************************************/
-
-bool cli_null_set_signing(struct cli_state *cli)
-{
-	return null_set_signing(&cli->sign_info);
-}
-
-/***********************************************************
- SMB signing - temp implementation - setup the MAC key.
-************************************************************/
-
-bool cli_temp_set_signing(struct cli_state *cli)
-{
-	if (!cli_set_smb_signing_common(cli)) {
-		return False;
-	}
-
-	cli->sign_info.signing_context = NULL;
-
-	cli->sign_info.sign_outgoing_message = temp_sign_outgoing_message;
-	cli->sign_info.check_incoming_message = temp_check_incoming_message;
-	cli->sign_info.free_signing_context = temp_free_signing_context;
-
-	return True;
-}
-
-void cli_free_signing_context(struct cli_state *cli)
-{
-	free_signing_context(&cli->sign_info);
-}
-
-/**
- * Sign a packet with the current mechanism
- */
-
-void cli_calculate_sign_mac(struct cli_state *cli, char *buf)
-{
-	cli->sign_info.sign_outgoing_message(buf, &cli->sign_info);
-}
-
-/**
- * Check a packet with the current mechanism
- * @return False if we had an established signing connection
- *         which had a bad checksum, True otherwise.
- */
-
-bool cli_check_sign_mac(struct cli_state *cli, char *buf)
-{
-	if (!cli->sign_info.check_incoming_message(buf, &cli->sign_info, True)) {
-		free_signing_context(&cli->sign_info);	
-		return False;
-	}
-	return True;
-}
-
-/***********************************************************
- Enter trans/trans2/nttrans state.
-************************************************************/
-
-bool client_set_trans_sign_state_on(struct cli_state *cli, uint16 mid)
-{
-	struct smb_sign_info *si = &cli->sign_info;
-	struct smb_basic_signing_context *data = (struct smb_basic_signing_context *)si->signing_context;
-
-	if (!si->doing_signing) {
-		return True;
-	}
-
-	if (!data) {
-		return False;
-	}
-
-	if (!set_sequence_can_delete_flag(&data->outstanding_packet_list, mid, False)) {
-		return False;
-	}
-
-	return True;
-}
-
-/***********************************************************
- Leave trans/trans2/nttrans state.
-************************************************************/
-
-bool client_set_trans_sign_state_off(struct cli_state *cli, uint16 mid)
-{
-	uint32 reply_seq_num;
-	struct smb_sign_info *si = &cli->sign_info;
-	struct smb_basic_signing_context *data = (struct smb_basic_signing_context *)si->signing_context;
-
-	if (!si->doing_signing) {
-		return True;
-	}
-
-	if (!data) {
-		return False;
-	}
-
-	if (!set_sequence_can_delete_flag(&data->outstanding_packet_list, mid, True)) {
-		return False;
-	}
-
-	/* Now delete the stored mid entry. */
-	if (!get_sequence_for_reply(&data->outstanding_packet_list, mid, &reply_seq_num)) {
-		return False;
-	}
-
-	return True;
-}
-
-/***********************************************************
- Is client signing on ?
-************************************************************/
-
-bool client_is_signing_on(struct cli_state *cli)
-{
-	struct smb_sign_info *si = &cli->sign_info;
-	return si->doing_signing;
-}
-
-/***********************************************************
- SMB signing - Server implementation - send the MAC.
-************************************************************/
-
-static void srv_sign_outgoing_message(char *outbuf, struct smb_sign_info *si)
-{
-	unsigned char calc_md5_mac[16];
-	struct smb_basic_signing_context *data =
-		(struct smb_basic_signing_context *)si->signing_context;
-	uint32 send_seq_number = data->send_seq_num-1;
-	uint16 mid;
-
-	if (!si->doing_signing) {
-		return;
-	}
-
-	/* JRA Paranioa test - we should be able to get rid of this... */
-	if (smb_len(outbuf) < (smb_ss_field + 8 - 4)) {
-		DEBUG(1, ("srv_sign_outgoing_message: Logic error. Can't send signature on short packet! smb_len = %u\n",
-					smb_len(outbuf) ));
-		abort();
-	}
-
-	/* mark the packet as signed - BEFORE we sign it...*/
-	mark_packet_signed(outbuf);
-
-	mid = SVAL(outbuf, smb_mid);
-
-	/* See if this is a reply for a deferred packet. */
-	get_sequence_for_reply(&data->outstanding_packet_list, mid, &send_seq_number);
-
-	simple_packet_signature(data, (const unsigned char *)outbuf, send_seq_number, calc_md5_mac);
-
-	DEBUG(10, ("srv_sign_outgoing_message: seq %u: sent SMB signature of\n", (unsigned int)send_seq_number));
-	dump_data(10, calc_md5_mac, 8);
-
-	memcpy(&outbuf[smb_ss_field], calc_md5_mac, 8);
-
-/*	cli->outbuf[smb_ss_field+2]=0; 
-	Uncomment this to test if the remote client actually verifies signatures...*/
-}
-
-/***********************************************************
- SMB signing - Server implementation - check a MAC sent by server.
-************************************************************/
-
-static bool srv_check_incoming_message(const char *inbuf,
-				       struct smb_sign_info *si,
-				       bool must_be_ok)
-{
-	bool good;
-	struct smb_basic_signing_context *data =
-		(struct smb_basic_signing_context *)si->signing_context;
-	uint32 reply_seq_number = data->send_seq_num;
-	uint32 saved_seq;
-	unsigned char calc_md5_mac[16];
-	unsigned char *server_sent_mac;
-
-	if (!si->doing_signing)
-		return True;
-
-	if (smb_len(inbuf) < (smb_ss_field + 8 - 4)) {
-		DEBUG(1, ("srv_check_incoming_message: Can't check signature on short packet! smb_len = %u\n", smb_len(inbuf)));
-		return False;
-	}
-
-	/* We always increment the sequence number. */
-	data->send_seq_num += 2;
-
-	saved_seq = reply_seq_number;
-	simple_packet_signature(data, (const unsigned char *)inbuf, reply_seq_number, calc_md5_mac);
-
-	server_sent_mac = (unsigned char *)&inbuf[smb_ss_field];
-	good = (memcmp(server_sent_mac, calc_md5_mac, 8) == 0);
-
-	if (!good) {
-
-		if (saved_seq) {
-			DEBUG(0, ("srv_check_incoming_message: BAD SIG: seq %u wanted SMB signature of\n",
-					(unsigned int)saved_seq));
-			dump_data(5, calc_md5_mac, 8);
-
-			DEBUG(0, ("srv_check_incoming_message: BAD SIG: seq %u got SMB signature of\n",
-						(unsigned int)reply_seq_number));
-			dump_data(5, server_sent_mac, 8);
-		}
-
-#if 1 /* JRATEST */
-		{
-			int i;
-			reply_seq_number -= 5;
-			for (i = 0; i < 10; i++, reply_seq_number++) {
-				simple_packet_signature(data, (const unsigned char *)inbuf, reply_seq_number, calc_md5_mac);
-				if (memcmp(server_sent_mac, calc_md5_mac, 8) == 0) {
-					DEBUG(0,("srv_check_incoming_message: out of seq. seq num %u matches. \
-We were expecting seq %u\n", reply_seq_number, saved_seq ));
-					break;
-				}
-			}
-		}
-#endif /* JRATEST */
-
-	} else {
-		DEBUG(10, ("srv_check_incoming_message: seq %u: (current is %u) got good SMB signature of\n", (unsigned int)reply_seq_number, (unsigned int)data->send_seq_num));
-		dump_data(10, server_sent_mac, 8);
-	}
-
-	return (signing_good(inbuf, si, good, saved_seq, must_be_ok));
-}
-
-/***********************************************************
- SMB signing - server API's.
-************************************************************/
-
-static struct smb_sign_info srv_sign_info = {
-	null_sign_outgoing_message,
-	null_check_incoming_message,
-	null_free_signing_context,
-	NULL,
-	False,
-	False,
-	False,
-	False
-};
-
-/***********************************************************
- Turn signing off or on for oplock break code.
-************************************************************/
-
-bool srv_oplock_set_signing(bool onoff)
-{
-	bool ret = srv_sign_info.doing_signing;
-	srv_sign_info.doing_signing = onoff;
-	return ret;
-}
-
-/***********************************************************
- Called to validate an incoming packet from the client.
-************************************************************/
-
-bool srv_check_sign_mac(const char *inbuf, bool must_be_ok)
-{
-	/* Check if it's a non-session message. */
-	if(CVAL(inbuf,0)) {
-		return True;
-	}
-
-	return srv_sign_info.check_incoming_message(inbuf, &srv_sign_info, must_be_ok);
-}
-
-/***********************************************************
- Called to sign an outgoing packet to the client.
-************************************************************/
-
-void srv_calculate_sign_mac(char *outbuf)
-{
-	/* Check if it's a non-session message. */
-	if(CVAL(outbuf,0)) {
-		return;
-	}
-
-	srv_sign_info.sign_outgoing_message(outbuf, &srv_sign_info);
-}
-
-/***********************************************************
- Called by server to defer an outgoing packet.
-************************************************************/
-
-void srv_defer_sign_response(uint16 mid)
-{
-	struct smb_basic_signing_context *data;
-
-	if (!srv_sign_info.doing_signing)
-		return;
-
-	data = (struct smb_basic_signing_context *)srv_sign_info.signing_context;
-
-	if (!data)
-		return;
-
-	/*
-	 * Ensure we only store this mid reply once...
-	 */
-
-	store_sequence_for_reply(&data->outstanding_packet_list, mid,
-				 data->send_seq_num-1);
-}
-
-/***********************************************************
- Called to remove sequence records when a deferred packet is
- cancelled by mid. This should never find one....
-************************************************************/
-
-void srv_cancel_sign_response(uint16 mid, bool cancel)
-{
-	struct smb_basic_signing_context *data;
-	uint32 dummy_seq;
-
-	if (!srv_sign_info.doing_signing)
-		return;
-
-	data = (struct smb_basic_signing_context *)srv_sign_info.signing_context;
-
-	if (!data)
-		return;
-
-	DEBUG(10,("srv_cancel_sign_response: for mid %u\n", (unsigned int)mid ));
-
-	while (get_sequence_for_reply(&data->outstanding_packet_list, mid, &dummy_seq))
-		;
-
-	/* cancel doesn't send a reply so doesn't burn a sequence number. */
-	if (cancel) {
-		data->send_seq_num -= 1;
-	}
-}
-
-/***********************************************************
- Called by server negprot when signing has been negotiated.
-************************************************************/
-
-void srv_set_signing_negotiated(void)
-{
-	srv_sign_info.allow_smb_signing = True;
-	srv_sign_info.negotiated_smb_signing = True;
-	if (lp_server_signing() == Required)
-		srv_sign_info.mandatory_signing = True;
-
-	srv_sign_info.sign_outgoing_message = temp_sign_outgoing_message;
-	srv_sign_info.check_incoming_message = temp_check_incoming_message;
-	srv_sign_info.free_signing_context = temp_free_signing_context;
-}
-
-/***********************************************************
- Returns whether signing is active. We can't use sendfile or raw
- reads/writes if it is.
-************************************************************/
-
-bool srv_is_signing_active(void)
-{
-	return srv_sign_info.doing_signing;
-}
-
-
-/***********************************************************
- Returns whether signing is negotiated. We can't use it unless it was
- in the negprot.  
-************************************************************/
-
-bool srv_is_signing_negotiated(void)
-{
-	return srv_sign_info.negotiated_smb_signing;
-}
-
-/***********************************************************
- Returns whether signing is actually happening
-************************************************************/
-
-bool srv_signing_started(void)
-{
-	struct smb_basic_signing_context *data;
-
-	if (!srv_sign_info.doing_signing) {
-		return False;
-	}
-
-	data = (struct smb_basic_signing_context *)srv_sign_info.signing_context;
-	if (!data)
-		return False;
-
-	if (data->send_seq_num == 0) {
-		return False;
-	}
-
-	return True;
-}
-
-/***********************************************************
- Turn on signing from this packet onwards. 
-************************************************************/
-
-void srv_set_signing(const DATA_BLOB user_session_key, const DATA_BLOB response)
-{
-	struct smb_basic_signing_context *data;
-
-	if (!user_session_key.length)
-		return;
-
-	if (!srv_sign_info.negotiated_smb_signing && !srv_sign_info.mandatory_signing) {
-		DEBUG(5,("srv_set_signing: signing negotiated = %u, mandatory_signing = %u. Not allowing smb signing.\n",
-			(unsigned int)srv_sign_info.negotiated_smb_signing,
-			(unsigned int)srv_sign_info.mandatory_signing ));
-		return;
-	}
-
-	/* Once we've turned on, ignore any more sessionsetups. */
-	if (srv_sign_info.doing_signing) {
-		return;
-	}
-
-	if (srv_sign_info.free_signing_context)
-		srv_sign_info.free_signing_context(&srv_sign_info);
-
-	srv_sign_info.doing_signing = True;
-
-	data = SMB_XMALLOC_P(struct smb_basic_signing_context);
-	memset(data, '\0', sizeof(*data));
-
-	srv_sign_info.signing_context = data;
-
-	data->mac_key = data_blob(NULL, response.length + user_session_key.length);
-
-	memcpy(&data->mac_key.data[0], user_session_key.data, user_session_key.length);
-	if (response.length)
-		memcpy(&data->mac_key.data[user_session_key.length],response.data, response.length);
-
-	dump_data_pw("MAC ssession key is:\n", data->mac_key.data, data->mac_key.length);
-
-	DEBUG(3,("srv_set_signing: turning on SMB signing: signing negotiated = %s, mandatory_signing = %s.\n",
-				BOOLSTR(srv_sign_info.negotiated_smb_signing),
-			 	BOOLSTR(srv_sign_info.mandatory_signing) ));
-
-	/* Initialise the sequence number */
-	data->send_seq_num = 0;
-
-	/* Initialise the list of outstanding packets */
-	data->outstanding_packet_list = NULL;
-
-	srv_sign_info.sign_outgoing_message = srv_sign_outgoing_message;
-	srv_sign_info.check_incoming_message = srv_check_incoming_message;
-	srv_sign_info.free_signing_context = simple_free_signing_context;
-}