1 files changed, 407 insertions, 0 deletions
diff --git a/source/libsmb/ntlmssp_sign.c b/source/libsmb/ntlmssp_sign.c
new file mode 100644
index 00000000000..2347619e57d
--- /dev/null
+++ b/source/libsmb/ntlmssp_sign.c
@@ -0,0 +1,407 @@
+/* 
+ *  Unix SMB/CIFS implementation.
+ *  Version 3.0
+ *  NTLMSSP Signing routines
+ *  Copyright (C) Luke Kenneth Casson Leighton 1996-2001
+ *  Copyright (C) Andrew Bartlett 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 2 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, write to the Free Software Foundation,
+ *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "includes.h"
+
+#define CLI_SIGN "session key to client-to-server signing key magic constant"
+#define CLI_SEAL "session key to client-to-server sealing key magic constant"
+#define SRV_SIGN "session key to server-to-client signing key magic constant"
+#define SRV_SEAL "session key to server-to-client sealing key magic constant"
+
+static void NTLMSSPcalc_ap( unsigned char *hash, unsigned char *data, int len)
+{
+    unsigned char index_i = hash[256];
+    unsigned char index_j = hash[257];
+    int ind;
+
+    for (ind = 0; ind < len; ind++)
+    {
+        unsigned char tc;
+        unsigned char t;
+
+        index_i++;
+        index_j += hash[index_i];
+
+        tc = hash[index_i];
+        hash[index_i] = hash[index_j];
+        hash[index_j] = tc;
+
+        t = hash[index_i] + hash[index_j];
+        data[ind] = data[ind] ^ hash[t];
+    }
+
+    hash[256] = index_i;
+    hash[257] = index_j;
+}
+
+static void calc_hash(unsigned char hash[258], const char *k2, int k2l)
+{
+	unsigned char j = 0;
+	int ind;
+
+	for (ind = 0; ind < 256; ind++)
+	{
+		hash[ind] = (unsigned char)ind;
+	}
+
+	for (ind = 0; ind < 256; ind++)
+	{
+		unsigned char tc;
+
+		j += (hash[ind] + k2[ind%k2l]);
+
+		tc = hash[ind];
+		hash[ind] = hash[j];
+		hash[j] = tc;
+	}
+
+	hash[256] = 0;
+	hash[257] = 0;
+}
+
+static void calc_ntlmv2_hash(unsigned char hash[258], unsigned char digest[16],
+			     DATA_BLOB session_key, 
+			     const char *constant)
+{
+	struct MD5Context ctx3;
+
+	/* NOTE:  This code is currently complate fantasy - it's
+	   got more in common with reality than the previous code
+	   (the LM session key is not the right thing to use) but
+	   it still needs work */
+
+	MD5Init(&ctx3);
+	MD5Update(&ctx3, session_key.data, session_key.length);
+	MD5Update(&ctx3, (const unsigned char *)constant, strlen(constant)+1);
+	MD5Final(digest, &ctx3);
+
+	calc_hash(hash, digest, 16);
+}
+
+enum ntlmssp_direction {
+	NTLMSSP_SEND,
+	NTLMSSP_RECEIVE
+};
+
+static NTSTATUS ntlmssp_make_packet_signature(NTLMSSP_STATE *ntlmssp_state,
+					      const uchar *data, size_t length, 
+					      enum ntlmssp_direction direction,
+					      DATA_BLOB *sig) 
+{
+	if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
+		HMACMD5Context ctx;
+		uchar seq_num[4];
+		uchar digest[16];
+		SIVAL(seq_num, 0, ntlmssp_state->ntlmssp_seq_num);
+
+		hmac_md5_init_limK_to_64((const unsigned char *)(ntlmssp_state->send_sign_const), 16, &ctx);
+		hmac_md5_update(seq_num, 4, &ctx);
+		hmac_md5_update(data, length, &ctx);
+		hmac_md5_final(digest, &ctx);
+
+		if (!msrpc_gen(sig, "dBd", NTLMSSP_SIGN_VERSION, digest, 8 /* only copy first 8 bytes */
+			       , ntlmssp_state->ntlmssp_seq_num)) {
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
+			switch (direction) {
+			case NTLMSSP_SEND:
+				NTLMSSPcalc_ap(ntlmssp_state->send_sign_hash,  sig->data+4, sig->length-4);
+				break;
+			case NTLMSSP_RECEIVE:
+				NTLMSSPcalc_ap(ntlmssp_state->recv_sign_hash,  sig->data+4, sig->length-4);
+				break;
+			}
+		}
+	} else {
+		uint32 crc;
+		crc = crc32_calc_buffer((const char *)data, length);
+		if (!msrpc_gen(sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, ntlmssp_state->ntlmssp_seq_num)) {
+			return NT_STATUS_NO_MEMORY;
+		}
+		
+		dump_data_pw("ntlmssp hash:\n", ntlmssp_state->ntlmssp_hash,
+			     sizeof(ntlmssp_state->ntlmssp_hash));
+		NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, sig->data+4, sig->length-4);
+	}
+	return NT_STATUS_OK;
+}
+
+NTSTATUS ntlmssp_sign_packet(NTLMSSP_STATE *ntlmssp_state,
+				    const uchar *data, size_t length, 
+				    DATA_BLOB *sig) 
+{
+	NTSTATUS nt_status;
+	if (!ntlmssp_state->session_key.length) {
+		DEBUG(3, ("NO session key, cannot check sign packet\n"));
+		return NT_STATUS_NO_USER_SESSION_KEY;
+	}
+
+	nt_status = ntlmssp_make_packet_signature(ntlmssp_state, data, length, NTLMSSP_SEND, sig);
+
+	/* increment counter on send */
+	ntlmssp_state->ntlmssp_seq_num++;
+	return nt_status;
+}
+
+/**
+ * Check the signature of an incoming packet 
+ * @note caller *must* check that the signature is the size it expects 
+ *
+ */
+
+NTSTATUS ntlmssp_check_packet(NTLMSSP_STATE *ntlmssp_state,
+			      const uchar *data, size_t length, 
+			      const DATA_BLOB *sig) 
+{
+	DATA_BLOB local_sig;
+	NTSTATUS nt_status;
+
+	if (!ntlmssp_state->session_key.length) {
+		DEBUG(3, ("NO session key, cannot check packet signature\n"));
+		return NT_STATUS_NO_USER_SESSION_KEY;
+	}
+
+	if (sig->length < 8) {
+		DEBUG(0, ("NTLMSSP packet check failed due to short signature (%lu bytes)!\n", 
+			  (unsigned long)sig->length));
+	}
+
+	nt_status = ntlmssp_make_packet_signature(ntlmssp_state, data, 
+						  length, NTLMSSP_RECEIVE, &local_sig);
+	
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		DEBUG(0, ("NTLMSSP packet check failed with %s\n", nt_errstr(nt_status)));
+		return nt_status;
+	}
+	
+	if (memcmp(sig->data+sig->length - 8, local_sig.data+local_sig.length - 8, 8) != 0) {
+		DEBUG(5, ("BAD SIG: wanted signature of\n"));
+		dump_data(5, (const char *)local_sig.data, local_sig.length);
+		
+		DEBUG(5, ("BAD SIG: got signature of\n"));
+		dump_data(5, (const char *)(sig->data), sig->length);
+
+		DEBUG(0, ("NTLMSSP packet check failed due to invalid signature!\n"));
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	/* increment counter on recieive */
+	ntlmssp_state->ntlmssp_seq_num++;
+
+	return NT_STATUS_OK;
+}
+
+
+/**
+ * Seal data with the NTLMSSP algorithm
+ *
+ */
+
+NTSTATUS ntlmssp_seal_packet(NTLMSSP_STATE *ntlmssp_state,
+			     uchar *data, size_t length,
+			     DATA_BLOB *sig)
+{	
+	if (!ntlmssp_state->session_key.length) {
+		DEBUG(3, ("NO session key, cannot seal packet\n"));
+		return NT_STATUS_NO_USER_SESSION_KEY;
+	}
+
+	DEBUG(10,("ntlmssp_seal_data: seal\n"));
+	dump_data_pw("ntlmssp clear data\n", data, length);
+	if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
+		HMACMD5Context ctx;
+		char seq_num[4];
+		uchar digest[16];
+		SIVAL(seq_num, 0, ntlmssp_state->ntlmssp_seq_num);
+
+		hmac_md5_init_limK_to_64((const unsigned char *)(ntlmssp_state->send_sign_const), 16, &ctx);
+		hmac_md5_update((const unsigned char *)seq_num, 4, &ctx);
+		hmac_md5_update(data, length, &ctx);
+		hmac_md5_final(digest, &ctx);
+
+		if (!msrpc_gen(sig, "dBd", NTLMSSP_SIGN_VERSION, digest, 8 /* only copy first 8 bytes */
+			       , ntlmssp_state->ntlmssp_seq_num)) {
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		dump_data_pw("ntlmssp client sealing hash:\n", 
+			     ntlmssp_state->send_seal_hash,
+			     sizeof(ntlmssp_state->send_seal_hash));
+		NTLMSSPcalc_ap(ntlmssp_state->send_seal_hash, data, length);
+		dump_data_pw("ntlmssp client signing hash:\n", 
+			     ntlmssp_state->send_sign_hash,
+			     sizeof(ntlmssp_state->send_sign_hash));
+		NTLMSSPcalc_ap(ntlmssp_state->send_sign_hash,  sig->data+4, sig->length-4);
+	} else {
+		uint32 crc;
+		crc = crc32_calc_buffer((const char *)data, length);
+		if (!msrpc_gen(sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, ntlmssp_state->ntlmssp_seq_num)) {
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		/* The order of these two operations matters - we must first seal the packet,
+		   then seal the sequence number - this is becouse the ntlmssp_hash is not
+		   constant, but is is rather updated with each iteration */
+		
+		dump_data_pw("ntlmssp hash:\n", ntlmssp_state->ntlmssp_hash,
+			     sizeof(ntlmssp_state->ntlmssp_hash));
+		NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, data, length);
+
+		dump_data_pw("ntlmssp hash:\n", ntlmssp_state->ntlmssp_hash,
+			     sizeof(ntlmssp_state->ntlmssp_hash));
+		NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, sig->data+4, sig->length-4);
+	}
+	dump_data_pw("ntlmssp sealed data\n", data, length);
+
+	/* increment counter on send */
+	ntlmssp_state->ntlmssp_seq_num++;
+
+	return NT_STATUS_OK;
+}
+
+/**
+ * Unseal data with the NTLMSSP algorithm
+ *
+ */
+
+NTSTATUS ntlmssp_unseal_packet(NTLMSSP_STATE *ntlmssp_state,
+				      uchar *data, size_t length,
+				      DATA_BLOB *sig)
+{
+	if (!ntlmssp_state->session_key.length) {
+		DEBUG(3, ("NO session key, cannot unseal packet\n"));
+		return NT_STATUS_NO_USER_SESSION_KEY;
+	}
+
+	DEBUG(10,("ntlmssp__unseal_data: seal\n"));
+	dump_data_pw("ntlmssp sealed data\n", data, length);
+	if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
+		NTLMSSPcalc_ap(ntlmssp_state->recv_seal_hash, data, length);
+	} else {
+		dump_data_pw("ntlmssp hash:\n", ntlmssp_state->ntlmssp_hash,
+			     sizeof(ntlmssp_state->ntlmssp_hash));
+		NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, data, length);
+	}
+	dump_data_pw("ntlmssp clear data\n", data, length);
+
+	return ntlmssp_check_packet(ntlmssp_state, data, length, sig);
+}
+
+/**
+   Initialise the state for NTLMSSP signing.
+*/
+NTSTATUS ntlmssp_sign_init(NTLMSSP_STATE *ntlmssp_state)
+{
+	unsigned char p24[24];
+	ZERO_STRUCT(p24);
+
+	DEBUG(3, ("NTLMSSP Sign/Seal - Initialising with flags:\n"));
+	debug_ntlmssp_flags(ntlmssp_state->neg_flags);
+
+	if (!ntlmssp_state->session_key.length) {
+		DEBUG(3, ("NO session key, cannot intialise signing\n"));
+		return NT_STATUS_NO_USER_SESSION_KEY;
+	}
+
+	if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
+	{
+		const char *send_sign_const;
+		const char *send_seal_const;
+		const char *recv_sign_const;
+		const char *recv_seal_const;
+
+		switch (ntlmssp_state->role) {
+		case NTLMSSP_CLIENT:
+			send_sign_const = CLI_SIGN;
+			send_seal_const = CLI_SEAL;
+			recv_sign_const = SRV_SIGN;
+			recv_seal_const = SRV_SEAL;
+			break;
+		case NTLMSSP_SERVER:
+			send_sign_const = SRV_SIGN;
+			send_seal_const = SRV_SEAL;
+			recv_sign_const = CLI_SIGN;
+			recv_seal_const = CLI_SEAL;
+			break;
+		}
+
+		calc_ntlmv2_hash(ntlmssp_state->send_sign_hash, 
+				 ntlmssp_state->send_sign_const, 
+				 ntlmssp_state->session_key, send_sign_const);
+		dump_data_pw("NTLMSSP send sign hash:\n", 
+			     ntlmssp_state->send_sign_hash, 
+			     sizeof(ntlmssp_state->send_sign_hash));
+
+		calc_ntlmv2_hash(ntlmssp_state->send_seal_hash, 
+				 ntlmssp_state->send_seal_const, 
+				 ntlmssp_state->session_key, send_seal_const);
+		dump_data_pw("NTLMSSP send sesl hash:\n", 
+			     ntlmssp_state->send_seal_hash, 
+			     sizeof(ntlmssp_state->send_seal_hash));
+
+		calc_ntlmv2_hash(ntlmssp_state->recv_sign_hash, 
+				 ntlmssp_state->recv_sign_const, 
+				 ntlmssp_state->session_key, recv_sign_const);
+		dump_data_pw("NTLMSSP receive sign hash:\n", 
+			     ntlmssp_state->recv_sign_hash, 
+			     sizeof(ntlmssp_state->recv_sign_hash));
+
+		calc_ntlmv2_hash(ntlmssp_state->recv_seal_hash, 
+				 ntlmssp_state->recv_seal_const, 
+				 ntlmssp_state->session_key, recv_seal_const);
+		dump_data_pw("NTLMSSP receive seal hash:\n", 
+			     ntlmssp_state->recv_sign_hash, 
+			     sizeof(ntlmssp_state->recv_sign_hash));
+
+	} 
+	else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
+		if (!ntlmssp_state->session_key.data || ntlmssp_state->session_key.length < 8) {
+			/* can't sign or check signatures yet */ 
+			DEBUG(5, ("NTLMSSP Sign/Seal - cannot use LM KEY yet\n"));	
+			return NT_STATUS_UNSUCCESSFUL;
+		}
+		
+		DEBUG(5, ("NTLMSSP Sign/Seal - using LM KEY\n"));
+
+		calc_hash(ntlmssp_state->ntlmssp_hash, (const char *)(ntlmssp_state->session_key.data), 8);
+		dump_data_pw("NTLMSSP hash:\n", ntlmssp_state->ntlmssp_hash,
+			     sizeof(ntlmssp_state->ntlmssp_hash));
+	} else {
+		if (!ntlmssp_state->session_key.data || ntlmssp_state->session_key.length < 16) {
+			/* can't sign or check signatures yet */ 
+			DEBUG(5, ("NTLMSSP Sign/Seal - cannot use NT KEY yet\n"));
+			return NT_STATUS_UNSUCCESSFUL;
+		}
+		
+		DEBUG(5, ("NTLMSSP Sign/Seal - using NT KEY\n"));
+
+		calc_hash(ntlmssp_state->ntlmssp_hash, (const char *)(ntlmssp_state->session_key.data), 16);
+		dump_data_pw("NTLMSSP hash:\n", ntlmssp_state->ntlmssp_hash,
+			     sizeof(ntlmssp_state->ntlmssp_hash));
+	}
+
+	ntlmssp_state->ntlmssp_seq_num = 0;
+
+	return NT_STATUS_OK;
+}