Refactor the NTLMSSP code again - this time we use function pointers to

eliminate the dependency on the auth subsystem.  The next step is to add
the required code to 'ntlm_auth', for export to Squid etc.

Andrew Bartlett
(This used to be commit 9e48ab86da40e4c1cafa70c04fb9ebdcce23dfab)

2 files changed, 280 insertions, 1 deletions

diff --git a/source3/libsmb/cliconnect.c b/source3/libsmb/cliconnect.c
index cc3aaf92be..389b7a1733 100644
--- a/source3/libsmb/cliconnect.c
+++ b/source3/libsmb/cliconnect.c
@@ -465,7 +465,8 @@ static BOOL cli_session_setup_ntlmssp(struct cli_state *cli, const char *user,
 
 	neg_flags = NTLMSSP_NEGOTIATE_UNICODE | 
 		NTLMSSP_NEGOTIATE_128 | 
-		NTLMSSP_NEGOTIATE_NTLM;
+		NTLMSSP_NEGOTIATE_NTLM |
+		NTLMSSP_REQUEST_TARGET;
 
 	memset(sess_key, 0, 16);
 
diff --git a/source3/libsmb/ntlmssp.c b/source3/libsmb/ntlmssp.c
new file mode 100644
index 0000000000..4183f3e77a
--- /dev/null
+++ b/source3/libsmb/ntlmssp.c
@@ -0,0 +1,278 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 3.0
+   handle NLTMSSP, server side
+
+   Copyright (C) Andrew Tridgell      2001
+   Copyright (C) Andrew Bartlett 2001-2003
+
+   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"
+
+/**
+ * Default challange generation code.
+ *
+ */
+   
+
+static const uint8 *get_challenge(void *cookie)
+{
+	static uchar chal[8];
+	generate_random_buffer(chal, sizeof(chal), False);
+
+	return chal;
+}
+
+NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
+{
+	TALLOC_CTX *mem_ctx;
+
+	mem_ctx = talloc_init("NTLMSSP context");
+	
+	*ntlmssp_state = talloc_zero(mem_ctx, sizeof(**ntlmssp_state));
+	if (!*ntlmssp_state) {
+		DEBUG(0,("ntlmssp_start: talloc failed!\n"));
+		talloc_destroy(mem_ctx);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	ZERO_STRUCTP(*ntlmssp_state);
+
+	(*ntlmssp_state)->mem_ctx = mem_ctx;
+	(*ntlmssp_state)->get_challenge = get_challenge;
+
+	(*ntlmssp_state)->get_global_myname = global_myname;
+	(*ntlmssp_state)->get_domain = lp_workgroup;
+
+	return NT_STATUS_OK;
+}
+
+NTSTATUS ntlmssp_server_end(NTLMSSP_STATE **ntlmssp_state)
+{
+	TALLOC_CTX *mem_ctx = (*ntlmssp_state)->mem_ctx;
+
+	data_blob_free(&(*ntlmssp_state)->lm_resp);
+	data_blob_free(&(*ntlmssp_state)->nt_resp);
+
+	SAFE_FREE((*ntlmssp_state)->user);
+	SAFE_FREE((*ntlmssp_state)->domain);
+	SAFE_FREE((*ntlmssp_state)->workstation);
+
+	talloc_destroy(mem_ctx);
+	*ntlmssp_state = NULL;
+	return NT_STATUS_OK;
+}
+
+NTSTATUS ntlmssp_server_update(NTLMSSP_STATE *ntlmssp_state, 
+			       DATA_BLOB request, DATA_BLOB *reply) 
+{
+	uint32 ntlmssp_command;
+		
+	if (!msrpc_parse(&request, "Cd",
+			 "NTLMSSP",
+			 &ntlmssp_command)) {
+		return NT_STATUS_LOGON_FAILURE;
+	}
+
+	if (ntlmssp_command == NTLMSSP_NEGOTIATE) {
+		return ntlmssp_negotiate(ntlmssp_state, request, reply);
+	} else if (ntlmssp_command == NTLMSSP_AUTH) {
+		return ntlmssp_auth(ntlmssp_state, request, reply);
+	} else {
+		return NT_STATUS_LOGON_FAILURE;
+	}
+}
+
+static const char *ntlmssp_target_name(NTLMSSP_STATE *ntlmssp_state, 
+				       uint32 neg_flags, uint32 *chal_flags) 
+{
+	if (neg_flags & NTLMSSP_REQUEST_TARGET) {
+		*chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
+		*chal_flags |= NTLMSSP_REQUEST_TARGET;
+		if (lp_server_role() == ROLE_STANDALONE) {
+			*chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
+			return ntlmssp_state->get_global_myname();
+		} else {
+			*chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
+			return ntlmssp_state->get_domain();
+		};
+	} else {
+		return "";
+	}
+}
+
+NTSTATUS ntlmssp_negotiate(NTLMSSP_STATE *ntlmssp_state, 
+			   DATA_BLOB request, DATA_BLOB *reply) 
+{
+	DATA_BLOB struct_blob;
+	fstring dnsname, dnsdomname;
+	uint32 ntlmssp_command, neg_flags, chal_flags;
+	char *cliname=NULL, *domname=NULL;
+	const uint8 *cryptkey;
+	const char *target_name;
+
+	/* parse the NTLMSSP packet */
+#if 0
+	file_save("ntlmssp_negotiate.dat", request.data, request.length);
+#endif
+
+	if (!msrpc_parse(&request, "CddAA",
+			 "NTLMSSP",
+			 &ntlmssp_command,
+			 &neg_flags,
+			 &cliname,
+			 &domname)) {
+		return NT_STATUS_LOGON_FAILURE;
+	}
+
+	SAFE_FREE(cliname);
+	SAFE_FREE(domname);
+  
+	debug_ntlmssp_flags(neg_flags);
+
+	cryptkey = ntlmssp_state->get_challenge(ntlmssp_state->auth_context);
+
+	/* Give them the challenge. For now, ignore neg_flags and just
+	   return the flags we want. Obviously this is not correct */
+	
+	chal_flags = 
+		NTLMSSP_NEGOTIATE_128 | 
+		NTLMSSP_NEGOTIATE_NTLM;
+	
+	if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
+		chal_flags |= NTLMSSP_NEGOTIATE_UNICODE;
+		ntlmssp_state->unicode = True;
+	} else {
+		chal_flags |= NTLMSSP_NEGOTIATE_OEM;
+	}
+
+	target_name = ntlmssp_target_name(ntlmssp_state, 
+					  neg_flags, &chal_flags); 
+
+	/* This should be a 'netbios domain -> DNS domain' mapping */
+	dnsdomname[0] = '\0';
+	get_mydomname(dnsdomname);
+	strlower(dnsdomname);
+	
+	dnsname[0] = '\0';
+	get_myfullname(dnsname);
+	strlower(dnsname);
+	
+	if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) 
+	{
+		const char *target_name_dns = "";
+		if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
+			target_name_dns = dnsdomname;
+		} else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
+			target_name_dns = dnsname;
+		}
+
+		/* the numbers here are the string type flags */
+		msrpc_gen(&struct_blob, "aaaaa",
+			  ntlmssp_state->unicode, NTLMSSP_NAME_TYPE_DOMAIN, target_name,
+			  ntlmssp_state->unicode, NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
+			  ntlmssp_state->unicode, NTLMSSP_NAME_TYPE_DOMAIN_DNS, target_name_dns,
+			  ntlmssp_state->unicode, NTLMSSP_NAME_TYPE_SERVER_DNS, dnsdomname,
+			  ntlmssp_state->unicode, 0, "");
+	} else {
+		struct_blob = data_blob(NULL, 0);
+	}
+
+	{
+		const char *gen_string;
+		if (ntlmssp_state->unicode) {
+			gen_string = "CdUdbddB";
+		} else {
+			gen_string = "CdAdbddB";
+		}
+		
+		msrpc_gen(reply, gen_string,
+			  "NTLMSSP", 
+			  NTLMSSP_CHALLENGE,
+			  target_name,
+			  chal_flags,
+			  cryptkey, 8,
+			  0, 0,
+			  struct_blob.data, struct_blob.length);
+	}
+		
+	data_blob_free(&struct_blob);
+
+	return NT_STATUS_MORE_PROCESSING_REQUIRED;
+}
+
+NTSTATUS ntlmssp_auth(NTLMSSP_STATE *ntlmssp_state, 
+		      DATA_BLOB request, DATA_BLOB *reply) 
+{
+	DATA_BLOB sess_key;
+	uint32 ntlmssp_command, neg_flags;
+	NTSTATUS nt_status;
+
+	const char *parse_string;
+
+	/* parse the NTLMSSP packet */
+#if 0
+	file_save("ntlmssp_auth.dat", request.data, request.length);
+#endif
+
+	if (ntlmssp_state->unicode) {
+		parse_string = "CdBBUUUBd";
+	} else {
+		parse_string = "CdBBAAABd";
+	}
+
+	data_blob_free(&ntlmssp_state->lm_resp);
+	data_blob_free(&ntlmssp_state->nt_resp);
+
+	SAFE_FREE(ntlmssp_state->user);
+	SAFE_FREE(ntlmssp_state->domain);
+	SAFE_FREE(ntlmssp_state->workstation);
+
+	/* now the NTLMSSP encoded auth hashes */
+	if (!msrpc_parse(&request, parse_string,
+			 "NTLMSSP", 
+			 &ntlmssp_command, 
+			 &ntlmssp_state->lm_resp,
+			 &ntlmssp_state->nt_resp,
+			 &ntlmssp_state->domain, 
+			 &ntlmssp_state->user, 
+			 &ntlmssp_state->workstation,
+			 &sess_key,
+			 &neg_flags)) {
+		return NT_STATUS_LOGON_FAILURE;
+	}
+
+	data_blob_free(&sess_key);
+	
+	DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%d len2=%d\n",
+		 ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, ntlmssp_state->lm_resp.length, ntlmssp_state->nt_resp.length));
+
+#if 0
+	file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
+	file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
+#endif
+
+	nt_status = ntlmssp_state->check_password(ntlmssp_state->auth_context);
+	
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		return nt_status;
+	}
+
+	*reply = data_blob(NULL, 0);
+
+	return nt_status;
+}