r1274: revert -r 1239 as discussed with abartlet

metze
(This used to be commit 52e2d038252bd745d53c687d266ad3ad62efa6fc)

5 files changed, 433 insertions, 159 deletions

diff --git a/source4/libcli/auth/ntlmssp.c b/source4/libcli/auth/ntlmssp.c
index f72f98d8a0..6830db3f90 100644
--- a/source4/libcli/auth/ntlmssp.c
+++ b/source4/libcli/auth/ntlmssp.c
@@ -1,7 +1,7 @@
 /* 
    Unix SMB/Netbios implementation.
-
-   NLTMSSP code
+   Version 3.0
+   handle NLTMSSP, server side
 
    Copyright (C) Andrew Tridgell      2001
    Copyright (C) Andrew Bartlett 2001-2003
@@ -221,7 +221,6 @@ NTSTATUS ntlmssp_update(struct ntlmssp_state *ntlmssp_state,
 			TALLOC_CTX *out_mem_ctx, 
 			const DATA_BLOB in, DATA_BLOB *out) 
 {
-	NTSTATUS nt_status;
 	DATA_BLOB input;
 	uint32_t ntlmssp_command;
 	int i;
@@ -258,15 +257,13 @@ NTSTATUS ntlmssp_update(struct ntlmssp_state *ntlmssp_state,
 			break;
 		}
 	} else {
-		nt_status = ndr_pull_format_blob(&input, ntlmssp_state->mem_ctx, 
-				 	"Cd",
-				 	"NTLMSSP",
-				 	&ntlmssp_command);
-
-		if (!NT_STATUS_IS_OK(nt_status)) {
+		if (!msrpc_parse(ntlmssp_state->mem_ctx, 
+				 &input, "Cd",
+				 "NTLMSSP",
+				 &ntlmssp_command)) {
 			DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 			dump_data(2, (const char *)input.data, input.length);
-			return nt_status;
+			return NT_STATUS_INVALID_PARAMETER;
 		}
 	}
 
@@ -445,7 +442,6 @@ static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 					 TALLOC_CTX *out_mem_ctx, 
 					 const DATA_BLOB in, DATA_BLOB *out) 
 {
-	NTSTATUS nt_status;
 	DATA_BLOB struct_blob;
 	fstring dnsname, dnsdomname;
 	uint32_t neg_flags = 0;
@@ -460,18 +456,16 @@ static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 #endif
 
 	if (in.length) {
-		nt_status = ndr_pull_format_blob(&in, ntlmssp_state->mem_ctx, 
-				"CddAA",
-				"NTLMSSP",
-				&ntlmssp_command,
-				&neg_flags,
-				&cliname,
-				&domname);
-
-		if (!NT_STATUS_IS_OK(nt_status)) {
+		if (!msrpc_parse(ntlmssp_state->mem_ctx, 
+				 &in, "CddAA",
+				 "NTLMSSP",
+				 &ntlmssp_command,
+				 &neg_flags,
+				 &cliname,
+				 &domname)) {
 			DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP:\n"));
 			dump_data(2, (const char *)in.data, in.length);
-			return nt_status;
+			return NT_STATUS_INVALID_PARAMETER;
 		}
 		
 		debug_ntlmssp_flags(neg_flags);
@@ -521,14 +515,13 @@ static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 			target_name_dns = dnsname;
 		}
 
-		/* TODO: do we need to check the result here? --metze */
-		ndr_push_format_blob(&struct_blob, out_mem_ctx, 
-				"aaaaa",
-				NTLMSSP_NAME_TYPE_DOMAIN, target_name,
-				NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
-				NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
-				NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
-				0, "");
+		msrpc_gen(out_mem_ctx, 
+			  &struct_blob, "aaaaa",
+			  NTLMSSP_NAME_TYPE_DOMAIN, target_name,
+			  NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
+			  NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
+			  NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
+			  0, "");
 	} else {
 		struct_blob = data_blob(NULL, 0);
 	}
@@ -541,17 +534,16 @@ static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 		} else {
 			gen_string = "CdAdbddB";
 		}
-
-		/* TODO: do we need to check the result here? --metze */
-		ndr_push_format_blob(out, out_mem_ctx, 
-			 	gen_string,
-			 	"NTLMSSP", 
-			 	NTLMSSP_CHALLENGE,
-			 	target_name,
-			 	chal_flags,
-			 	cryptkey, 8,
-			 	0, 0,
-			 	struct_blob.data, struct_blob.length);
+		
+		msrpc_gen(out_mem_ctx, 
+			  out, gen_string,
+			  "NTLMSSP", 
+			  NTLMSSP_CHALLENGE,
+			  target_name,
+			  chal_flags,
+			  cryptkey, 8,
+			  0, 0,
+			  struct_blob.data, struct_blob.length);
 	}
 		
 	ntlmssp_state->expected_state = NTLMSSP_AUTH;
@@ -599,20 +591,18 @@ static NTSTATUS ntlmssp_server_preauth(struct ntlmssp_state *ntlmssp_state,
 	ntlmssp_state->workstation = NULL;
 
 	/* now the NTLMSSP encoded auth hashes */
-	nt_status = ndr_pull_format_blob(&request, ntlmssp_state->mem_ctx, 
-				parse_string,
-				"NTLMSSP", 
-				&ntlmssp_command, 
-				&ntlmssp_state->lm_resp,
-				&ntlmssp_state->nt_resp,
-				&domain, 
-				&user, 
-				&workstation,
-				&ntlmssp_state->encrypted_session_key,
-				&auth_flags);
-	
-	if (!NT_STATUS_IS_OK(nt_status)) {
-		DEBUG(10, ("ntlmssp_server_preauth: failed to parse NTLMSSP (nonfatal):\n"));
+	if (!msrpc_parse(ntlmssp_state->mem_ctx, 
+			 &request, parse_string,
+			 "NTLMSSP", 
+			 &ntlmssp_command, 
+			 &ntlmssp_state->lm_resp,
+			 &ntlmssp_state->nt_resp,
+			 &domain, 
+			 &user, 
+			 &workstation,
+			 &ntlmssp_state->encrypted_session_key,
+			 &auth_flags)) {
+		DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 		dump_data(10, (const char *)request.data, request.length);
 
 		/* zero this out */
@@ -627,20 +617,19 @@ static NTSTATUS ntlmssp_server_preauth(struct ntlmssp_state *ntlmssp_state,
 		}
 
 		/* now the NTLMSSP encoded auth hashes */
-		nt_status = ndr_pull_format_blob(&request, ntlmssp_state->mem_ctx, 
-					parse_string,
-					"NTLMSSP", 
-					&ntlmssp_command, 
-					&ntlmssp_state->lm_resp,
-					&ntlmssp_state->nt_resp,
-					&domain, 
-					&user, 
-					&workstation);
-
-		if (!NT_STATUS_IS_OK(nt_status)) {
-			DEBUG(1, ("ntlmssp_server_preauth: failed to parse NTLMSSP:\n"));
+		if (!msrpc_parse(ntlmssp_state->mem_ctx, 
+				 &request, parse_string,
+				 "NTLMSSP", 
+				 &ntlmssp_command, 
+				 &ntlmssp_state->lm_resp,
+				 &ntlmssp_state->nt_resp,
+				 &domain, 
+				 &user, 
+				 &workstation)) {
+			DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 			dump_data(2, (const char *)request.data, request.length);
-			return nt_status;
+
+			return NT_STATUS_INVALID_PARAMETER;
 		}
 	}
 
@@ -969,8 +958,6 @@ static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 				       TALLOC_CTX *out_mem_ctx, 
 				       DATA_BLOB in, DATA_BLOB *out) 
 {
-	NTSTATUS nt_status;
-
 	if (ntlmssp_state->unicode) {
 		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 	} else {
@@ -982,17 +969,13 @@ static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 	}
 
 	/* generate the ntlmssp negotiate packet */
-	nt_status = ndr_push_format_blob(out, out_mem_ctx, 
-		 		"CddAA",
-		 		"NTLMSSP",
-		 		NTLMSSP_NEGOTIATE,
-		 		ntlmssp_state->neg_flags,
-		 		ntlmssp_state->get_domain(), 
-		 		ntlmssp_state->get_global_myname());
-
-	if (!NT_STATUS_IS_OK(nt_status)) {
-		return nt_status;
-	}
+	msrpc_gen(out_mem_ctx, 
+		  out, "CddAA",
+		  "NTLMSSP",
+		  NTLMSSP_NEGOTIATE,
+		  ntlmssp_state->neg_flags,
+		  ntlmssp_state->get_domain(), 
+		  ntlmssp_state->get_global_myname());
 
 	ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 
@@ -1027,17 +1010,16 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 	DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
 	NTSTATUS nt_status;
 
-	nt_status = ndr_pull_format_blob(&in, ntlmssp_state->mem_ctx, 
-				"CdBd",
-				"NTLMSSP",
-				&ntlmssp_command, 
-				&server_domain_blob,
-				&chal_flags);
-
-	if (!NT_STATUS_IS_OK(nt_status)) {
+	if (!msrpc_parse(ntlmssp_state->mem_ctx, 
+			 &in, "CdBd",
+			 "NTLMSSP",
+			 &ntlmssp_command, 
+			 &server_domain_blob,
+			 &chal_flags)) {
 		DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
 		dump_data(2, (const char *)in.data, in.length);
-		return nt_status;
+
+		return NT_STATUS_INVALID_PARAMETER;
 	}
 	
 	data_blob_free(&server_domain_blob);
@@ -1067,20 +1049,18 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 	DEBUG(3, ("NTLMSSP: Set final flags:\n"));
 	debug_ntlmssp_flags(ntlmssp_state->neg_flags);
 
-	nt_status = ndr_pull_format_blob(&in, ntlmssp_state->mem_ctx, 
-			 	chal_parse_string,
-			 	"NTLMSSP",
-			 	&ntlmssp_command, 
-			 	&server_domain,
-			 	&chal_flags,
-			 	&challenge_blob, 8,
-			 	&unkn1, &unkn2,
-			 	&struct_blob);
-
-	if (!NT_STATUS_IS_OK(nt_status)) {
+	if (!msrpc_parse(ntlmssp_state->mem_ctx, 
+			 &in, chal_parse_string,
+			 "NTLMSSP",
+			 &ntlmssp_command, 
+			 &server_domain,
+			 &chal_flags,
+			 &challenge_blob, 8,
+			 &unkn1, &unkn2,
+			 &struct_blob)) {
 		DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
 		dump_data(2, (const char *)in.data, in.length);
-		return nt_status;
+		return NT_STATUS_INVALID_PARAMETER;
 	}
 
 	ntlmssp_state->server_domain = server_domain;
@@ -1236,20 +1216,19 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 	}
 
 	/* this generates the actual auth packet */
-	nt_status = ndr_push_format_blob(out, out_mem_ctx, 
-					auth_gen_string, 
-				"NTLMSSP", 
-				NTLMSSP_AUTH, 
-				lm_response.data, lm_response.length,
-				nt_response.data, nt_response.length,
-				ntlmssp_state->domain, 
-				ntlmssp_state->user, 
-				ntlmssp_state->get_global_myname(), 
-				encrypted_session_key.data, encrypted_session_key.length,
-				ntlmssp_state->neg_flags);
-
-	if (!NT_STATUS_IS_OK(nt_status)) {		
-		return nt_status;
+	if (!msrpc_gen(out_mem_ctx, 
+		       out, auth_gen_string, 
+		       "NTLMSSP", 
+		       NTLMSSP_AUTH, 
+		       lm_response.data, lm_response.length,
+		       nt_response.data, nt_response.length,
+		       ntlmssp_state->domain, 
+		       ntlmssp_state->user, 
+		       ntlmssp_state->get_global_myname(), 
+		       encrypted_session_key.data, encrypted_session_key.length,
+		       ntlmssp_state->neg_flags)) {
+		
+		return NT_STATUS_NO_MEMORY;
 	}
 
 	ntlmssp_state->session_key = session_key;
@@ -1263,9 +1242,7 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 
 	ntlmssp_state->expected_state = NTLMSSP_DONE;
 
-	nt_status = ntlmssp_sign_init(ntlmssp_state);
-
-	if (!NT_STATUS_IS_OK(nt_status)) {
+	if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
 		DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", 
 			  nt_errstr(nt_status)));
 		return nt_status;
diff --git a/source4/libcli/auth/ntlmssp_parse.c b/source4/libcli/auth/ntlmssp_parse.c
new file mode 100644
index 0000000000..251effd7e1
--- /dev/null
+++ b/source4/libcli/auth/ntlmssp_parse.c
@@ -0,0 +1,321 @@
+/* 
+   Unix SMB/CIFS implementation.
+   simple kerberos5/SPNEGO routines
+   Copyright (C) Andrew Tridgell 2001
+   Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
+   Copyright (C) Andrew Bartlett 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/*
+  this is a tiny msrpc packet generator. I am only using this to
+  avoid tying this code to a particular varient of our rpc code. This
+  generator is not general enough for all our rpc needs, its just
+  enough for the spnego/ntlmssp code
+
+  format specifiers are:
+
+  U = unicode string (input is unix string)
+  a = address (input is char *unix_string)
+      (1 byte type, 1 byte length, unicode/ASCII string, all inline)
+  A = ASCII string (input is unix string)
+  B = data blob (pointer + length)
+  b = data blob in header (pointer + length)
+  D
+  d = word (4 bytes)
+  C = constant ascii string
+ */
+BOOL msrpc_gen(TALLOC_CTX *mem_ctx, DATA_BLOB *blob,
+	       const char *format, ...)
+{
+	int i, n;
+	va_list ap;
+	char *s;
+	uint8_t *b;
+	int head_size=0, data_size=0;
+	int head_ofs, data_ofs;
+
+	/* first scan the format to work out the header and body size */
+	va_start(ap, format);
+	for (i=0; format[i]; i++) {
+		switch (format[i]) {
+		case 'U':
+			s = va_arg(ap, char *);
+			head_size += 8;
+			data_size += str_charnum(s) * 2;
+			break;
+		case 'A':
+			s = va_arg(ap, char *);
+			head_size += 8;
+			data_size += str_ascii_charnum(s);
+			break;
+		case 'a':
+			n = va_arg(ap, int);
+			s = va_arg(ap, char *);
+			data_size += (str_charnum(s) * 2) + 4;
+			break;
+		case 'B':
+			b = va_arg(ap, uint8_t *);
+			head_size += 8;
+			data_size += va_arg(ap, int);
+			break;
+		case 'b':
+			b = va_arg(ap, uint8_t *);
+			head_size += va_arg(ap, int);
+			break;
+		case 'd':
+			n = va_arg(ap, int);
+			head_size += 4;
+			break;
+		case 'C':
+			s = va_arg(ap, char *);
+			head_size += str_charnum(s) + 1;
+			break;
+		}
+	}
+	va_end(ap);
+
+	/* allocate the space, then scan the format again to fill in the values */
+	*blob = data_blob_talloc(mem_ctx, NULL, head_size + data_size);
+
+	head_ofs = 0;
+	data_ofs = head_size;
+
+	va_start(ap, format);
+	for (i=0; format[i]; i++) {
+		switch (format[i]) {
+		case 'U':
+			s = va_arg(ap, char *);
+			n = str_charnum(s);
+			SSVAL(blob->data, head_ofs, n*2); head_ofs += 2;
+			SSVAL(blob->data, head_ofs, n*2); head_ofs += 2;
+			SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
+			push_string(NULL, blob->data+data_ofs, s, n*2, STR_UNICODE|STR_NOALIGN);
+			data_ofs += n*2;
+			break;
+		case 'A':
+			s = va_arg(ap, char *);
+			n = str_ascii_charnum(s);
+			SSVAL(blob->data, head_ofs, n); head_ofs += 2;
+			SSVAL(blob->data, head_ofs, n); head_ofs += 2;
+			SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
+			push_string(NULL, blob->data+data_ofs, s, n, STR_ASCII|STR_NOALIGN);
+			data_ofs += n;
+			break;
+		case 'a':
+			n = va_arg(ap, int);
+			SSVAL(blob->data, data_ofs, n); data_ofs += 2;
+			s = va_arg(ap, char *);
+			n = str_charnum(s);
+			SSVAL(blob->data, data_ofs, n*2); data_ofs += 2;
+			if (0 < n) {
+				push_string(NULL, blob->data+data_ofs, s, n*2,
+					    STR_UNICODE|STR_NOALIGN);
+			}
+			data_ofs += n*2;
+			break;
+
+		case 'B':
+			b = va_arg(ap, uint8_t *);
+			n = va_arg(ap, int);
+			SSVAL(blob->data, head_ofs, n); head_ofs += 2;
+			SSVAL(blob->data, head_ofs, n); head_ofs += 2;
+			SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
+			if (n && b) /* don't follow null pointers... */
+				memcpy(blob->data+data_ofs, b, n);
+			data_ofs += n;
+			break;
+		case 'd':
+			n = va_arg(ap, int);
+			SIVAL(blob->data, head_ofs, n); head_ofs += 4;
+			break;
+		case 'b':
+			b = va_arg(ap, uint8_t *);
+			n = va_arg(ap, int);
+			memcpy(blob->data + head_ofs, b, n);
+			head_ofs += n;
+			break;
+		case 'C':
+			s = va_arg(ap, char *);
+			head_ofs += push_string(NULL, blob->data+head_ofs, s, -1, 
+						STR_ASCII|STR_TERMINATE);
+			break;
+		}
+	}
+	va_end(ap);
+
+	return True;
+}
+
+
+/* a helpful macro to avoid running over the end of our blob */
+#define NEED_DATA(amount) \
+if ((head_ofs + amount) > blob->length) { \
+        return False; \
+}
+
+/*
+  this is a tiny msrpc packet parser. This the the partner of msrpc_gen
+
+  format specifiers are:
+
+  U = unicode string (output is unix string)
+  A = ascii string
+  B = data blob
+  b = data blob in header
+  d = word (4 bytes)
+  C = constant ascii string
+ */
+
+BOOL msrpc_parse(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob,
+		 const char *format, ...)
+{
+	int i;
+	va_list ap;
+	const char **ps, *s;
+	DATA_BLOB *b;
+	size_t head_ofs = 0;
+	uint16_t len1, len2;
+	uint32_t ptr;
+	uint32_t *v;
+	pstring p;
+
+	va_start(ap, format);
+	for (i=0; format[i]; i++) {
+		switch (format[i]) {
+		case 'U':
+			NEED_DATA(8);
+			len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
+			len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
+			ptr =  IVAL(blob->data, head_ofs); head_ofs += 4;
+
+			ps = va_arg(ap, char **);
+			if (len1 == 0 && len2 == 0) {
+				*ps = "";
+			} else {
+				/* make sure its in the right format - be strict */
+				if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
+					return False;
+				}
+				if (len1 & 1) {
+					/* if odd length and unicode */
+					return False;
+				}
+				if (blob->data + ptr < (uint8_t *)ptr || blob->data + ptr < blob->data)
+					return False;
+
+				if (0 < len1) {
+					pull_string(NULL, p, blob->data + ptr, sizeof(p), 
+						    len1, 
+						    STR_UNICODE|STR_NOALIGN);
+					(*ps) = talloc_strdup(mem_ctx, p);
+					if (!(*ps)) {
+						return False;
+					}
+				} else {
+					(*ps) = "";
+				}
+			}
+			break;
+		case 'A':
+			NEED_DATA(8);
+			len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
+			len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
+			ptr =  IVAL(blob->data, head_ofs); head_ofs += 4;
+
+			ps = va_arg(ap, char **);
+			/* make sure its in the right format - be strict */
+			if (len1 == 0 && len2 == 0) {
+				*ps = "";
+			} else {
+				if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
+					return False;
+				}
+
+				if (blob->data + ptr < (uint8_t *)ptr || blob->data + ptr < blob->data)
+					return False;	
+
+				if (0 < len1) {
+					pull_string(NULL, p, blob->data + ptr, sizeof(p), 
+						    len1, 
+						    STR_ASCII|STR_NOALIGN);
+					(*ps) = talloc_strdup(mem_ctx, p);
+					if (!(*ps)) {
+						return False;
+					}
+				} else {
+					(*ps) = "";
+				}
+			}
+			break;
+		case 'B':
+			NEED_DATA(8);
+			len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
+			len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
+			ptr =  IVAL(blob->data, head_ofs); head_ofs += 4;
+
+			b = (DATA_BLOB *)va_arg(ap, void *);
+			if (len1 == 0 && len2 == 0) {
+				*b = data_blob_talloc(mem_ctx, NULL, 0);
+			} else {
+				/* make sure its in the right format - be strict */
+				if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
+					return False;
+				}
+
+				if (blob->data + ptr < (uint8_t *)ptr || blob->data + ptr < blob->data)
+					return False;	
+			
+				*b = data_blob_talloc(mem_ctx, blob->data + ptr, len1);
+			}
+			break;
+		case 'b':
+			b = (DATA_BLOB *)va_arg(ap, void *);
+			len1 = va_arg(ap, uint_t);
+			/* make sure its in the right format - be strict */
+			NEED_DATA(len1);
+			if (blob->data + head_ofs < (uint8_t *)head_ofs || blob->data + head_ofs < blob->data)
+				return False;	
+			
+			*b = data_blob_talloc(mem_ctx, blob->data + head_ofs, len1);
+			head_ofs += len1;
+			break;
+		case 'd':
+			v = va_arg(ap, uint32_t *);
+			NEED_DATA(4);
+			*v = IVAL(blob->data, head_ofs); head_ofs += 4;
+			break;
+		case 'C':
+			s = va_arg(ap, char *);
+
+			if (blob->data + head_ofs < (uint8_t *)head_ofs || blob->data + head_ofs < blob->data)
+				return False;	
+	
+			head_ofs += pull_string(NULL, p, blob->data+head_ofs, sizeof(p), 
+						blob->length - head_ofs, 
+						STR_ASCII|STR_TERMINATE);
+			if (strcmp(s, p) != 0) {
+				return False;
+			}
+			break;
+		}
+	}
+	va_end(ap);
+
+	return True;
+}
diff --git a/source4/libcli/auth/ntlmssp_sign.c b/source4/libcli/auth/ntlmssp_sign.c
index 385ea18cd2..d680da9495 100644
--- a/source4/libcli/auth/ntlmssp_sign.c
+++ b/source4/libcli/auth/ntlmssp_sign.c
@@ -117,8 +117,6 @@ static NTSTATUS ntlmssp_make_packet_signature(struct ntlmssp_state *ntlmssp_stat
 					      enum ntlmssp_direction direction,
 					      DATA_BLOB *sig) 
 {
-	NTSTATUS nt_status;
-
 	if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 
 		HMACMD5Context ctx;
@@ -157,18 +155,9 @@ static NTSTATUS ntlmssp_make_packet_signature(struct ntlmssp_state *ntlmssp_stat
 
 	} else {
 		uint32_t crc;
-
 		crc = crc32_calc_buffer((const char *)data, length);
-
-		nt_status = ndr_push_format_blob(sig, sig_mem_ctx,
-					"dddd",
-					NTLMSSP_SIGN_VERSION,
-					0,
-					crc,
-					ntlmssp_state->ntlmssp_seq_num);
-
-		if (!NT_STATUS_IS_OK(nt_status)) {
-			return nt_status;
+		if (!msrpc_gen(sig_mem_ctx, 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,
@@ -275,9 +264,7 @@ NTSTATUS ntlmssp_seal_packet(struct ntlmssp_state *ntlmssp_state,
 			     TALLOC_CTX *sig_mem_ctx, 
 			     uint8_t *data, size_t length,
 			     DATA_BLOB *sig)
-{
-	NTSTATUS nt_status;
-
+{	
 	if (!ntlmssp_state->session_key.length) {
 		DEBUG(3, ("NO session key, cannot seal packet\n"));
 		return NT_STATUS_NO_USER_SESSION_KEY;
@@ -313,18 +300,9 @@ NTSTATUS ntlmssp_seal_packet(struct ntlmssp_state *ntlmssp_state,
 		memcpy(sig->data + 12, seq_num, 4);
 	} else {
 		uint32_t crc;
-
 		crc = crc32_calc_buffer((const char *)data, length);
-
-		nt_status = ndr_push_format_blob(sig, sig_mem_ctx,
-					"dddd", 
-					NTLMSSP_SIGN_VERSION,
-					0,
-					crc, 
-					ntlmssp_state->ntlmssp_seq_num);
-
-		if (!NT_STATUS_IS_OK(nt_status)) {
-			return nt_status;
+		if (!msrpc_gen(sig_mem_ctx, 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,
diff --git a/source4/libcli/config.m4 b/source4/libcli/config.m4
index eb23c045af..992f84005d 100644
--- a/source4/libcli/config.m4
+++ b/source4/libcli/config.m4
@@ -44,6 +44,7 @@ SMB_SUBSYSTEM(LIBCLI_AUTH,[],
 		[libcli/auth/spnego.o
 		libcli/auth/spnego_parse.o
 		libcli/auth/ntlmssp.o
+		libcli/auth/ntlmssp_parse.o
 		libcli/auth/ntlmssp_sign.o
 		libcli/auth/schannel.o
 		libcli/auth/credentials.o
diff --git a/source4/libcli/util/smbencrypt.c b/source4/libcli/util/smbencrypt.c
index e2fb033279..72c6589097 100644
--- a/source4/libcli/util/smbencrypt.c
+++ b/source4/libcli/util/smbencrypt.c
@@ -267,12 +267,10 @@ DATA_BLOB NTLMv2_generate_names_blob(TALLOC_CTX *mem_ctx,
 {
 	DATA_BLOB names_blob = data_blob_talloc(mem_ctx, NULL, 0);
 	
-	ndr_push_format_blob(&names_blob ,mem_ctx,
-			"aaa", 
-			NTLMSSP_NAME_TYPE_DOMAIN, domain,
-			NTLMSSP_NAME_TYPE_SERVER, hostname,
-			0, "");
-
+	msrpc_gen(mem_ctx, &names_blob, "aaa", 
+		  NTLMSSP_NAME_TYPE_DOMAIN, domain,
+		  NTLMSSP_NAME_TYPE_SERVER, hostname,
+		  0, "");
 	return names_blob;
 }
 
@@ -291,14 +289,13 @@ static DATA_BLOB NTLMv2_generate_client_data(TALLOC_CTX *mem_ctx, const DATA_BLO
 
 	/* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
 
-	ndr_push_format_blob(&response, mem_ctx,
-			"ddbbdb", 
-			0x00000101,     /* Header  */
-			0,              /* 'Reserved'  */
-			long_date, 8,	  /* Timestamp */
-			client_chal, 8, /* client challenge */
-			0,		  /* Unknown */
-			names_blob->data, names_blob->length);	/* End of name list */
+	msrpc_gen(mem_ctx, &response, "ddbbdb", 
+		  0x00000101,     /* Header  */
+		  0,              /* 'Reserved'  */
+		  long_date, 8,	  /* Timestamp */
+		  client_chal, 8, /* client challenge */
+		  0,		  /* Unknown */
+		  names_blob->data, names_blob->length);	/* End of name list */
 
 	return response;
 }