r6113: Move GENSEC and the kerberos code out of libcli/auth, and into

auth/gensec and auth/kerberos.

This also pulls the kerberos configure code out of libads (which is
otherwise dead), and into auth/kerberos/kerberos.m4

Andrew Bartlett
(This used to be commit e074d63f3dcf4f84239a10879112ebaf1cfa6c4f)

1 files changed, 884 insertions, 0 deletions

diff --git a/source4/auth/gensec/spnego.c b/source4/auth/gensec/spnego.c
new file mode 100644
index 0000000000..f5a091cd78
--- /dev/null
+++ b/source4/auth/gensec/spnego.c
@@ -0,0 +1,884 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   RFC2478 Compliant SPNEGO implementation
+   
+   Copyright (C) Jim McDonough <jmcd@us.ibm.com>      2003
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
+
+   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"
+#include "auth/auth.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+enum spnego_state_position {
+	SPNEGO_SERVER_START,
+	SPNEGO_CLIENT_START,
+	SPNEGO_SERVER_TARG,
+	SPNEGO_CLIENT_TARG,
+	SPNEGO_FALLBACK,
+	SPNEGO_DONE
+};
+
+struct spnego_state {
+	uint_t ref_count;
+	enum spnego_message_type expected_packet;
+	enum spnego_state_position state_position;
+	struct gensec_security *sub_sec_security;
+	BOOL no_response_expected;
+};
+
+
+static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
+{
+	struct spnego_state *spnego_state;
+
+	spnego_state = talloc(gensec_security, struct spnego_state);		
+	if (!spnego_state) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
+	spnego_state->state_position = SPNEGO_CLIENT_START;
+	spnego_state->sub_sec_security = NULL;
+	spnego_state->no_response_expected = False;
+
+	gensec_security->private_data = spnego_state;
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
+{
+	struct spnego_state *spnego_state;
+
+	spnego_state = talloc(gensec_security, struct spnego_state);		
+	if (!spnego_state) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
+	spnego_state->state_position = SPNEGO_SERVER_START;
+	spnego_state->sub_sec_security = NULL;
+	spnego_state->no_response_expected = False;
+
+	gensec_security->private_data = spnego_state;
+	return NT_STATUS_OK;
+}
+
+/*
+  wrappers for the spnego_*() functions
+*/
+static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security, 
+					    TALLOC_CTX *mem_ctx, 
+					    uint8_t *data, size_t length, 
+					    const uint8_t *whole_pdu, size_t pdu_length, 
+					    DATA_BLOB *sig)
+{
+	struct spnego_state *spnego_state = gensec_security->private_data;
+
+	if (spnego_state->state_position != SPNEGO_DONE 
+	    && spnego_state->state_position != SPNEGO_FALLBACK) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
+	return gensec_unseal_packet(spnego_state->sub_sec_security, 
+				    mem_ctx, 
+				    data, length, 
+				    whole_pdu, pdu_length,
+				    sig); 
+}
+
+static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security, 
+					   TALLOC_CTX *mem_ctx, 
+					   const uint8_t *data, size_t length, 
+					   const uint8_t *whole_pdu, size_t pdu_length, 
+					   const DATA_BLOB *sig)
+{
+	struct spnego_state *spnego_state = gensec_security->private_data;
+
+	if (spnego_state->state_position != SPNEGO_DONE 
+	    && spnego_state->state_position != SPNEGO_FALLBACK) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
+	return gensec_check_packet(spnego_state->sub_sec_security, 
+				   mem_ctx, 
+				   data, length, 
+				   whole_pdu, pdu_length,
+				   sig);
+}
+
+static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security, 
+					  TALLOC_CTX *mem_ctx, 
+					  uint8_t *data, size_t length, 
+					  const uint8_t *whole_pdu, size_t pdu_length, 
+					  DATA_BLOB *sig)
+{
+	struct spnego_state *spnego_state = gensec_security->private_data;
+
+	if (spnego_state->state_position != SPNEGO_DONE 
+	    && spnego_state->state_position != SPNEGO_FALLBACK) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
+	return gensec_seal_packet(spnego_state->sub_sec_security, 
+				  mem_ctx, 
+				  data, length, 
+				  whole_pdu, pdu_length,
+				  sig);
+}
+
+static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security, 
+					  TALLOC_CTX *mem_ctx, 
+					  const uint8_t *data, size_t length, 
+					  const uint8_t *whole_pdu, size_t pdu_length, 
+					  DATA_BLOB *sig)
+{
+	struct spnego_state *spnego_state = gensec_security->private_data;
+
+	if (spnego_state->state_position != SPNEGO_DONE 
+	    && spnego_state->state_position != SPNEGO_FALLBACK) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
+	return gensec_sign_packet(spnego_state->sub_sec_security, 
+				  mem_ctx, 
+				  data, length, 
+				  whole_pdu, pdu_length,
+				  sig);
+}
+
+static NTSTATUS gensec_spnego_wrap(struct gensec_security *gensec_security, 
+				   TALLOC_CTX *mem_ctx, 
+				   const DATA_BLOB *in, 
+				   DATA_BLOB *out)
+{
+	struct spnego_state *spnego_state = gensec_security->private_data;
+
+	if (spnego_state->state_position != SPNEGO_DONE 
+	    && spnego_state->state_position != SPNEGO_FALLBACK) {
+		DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
+	return gensec_wrap(spnego_state->sub_sec_security, 
+			   mem_ctx, in, out);
+}
+
+static NTSTATUS gensec_spnego_unwrap(struct gensec_security *gensec_security, 
+				     TALLOC_CTX *mem_ctx, 
+				     const DATA_BLOB *in, 
+				     DATA_BLOB *out)
+{
+	struct spnego_state *spnego_state = gensec_security->private_data;
+
+	if (spnego_state->state_position != SPNEGO_DONE 
+	    && spnego_state->state_position != SPNEGO_FALLBACK) {
+		DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
+	return gensec_unwrap(spnego_state->sub_sec_security, 
+			     mem_ctx, in, out);
+}
+
+static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security) 
+{
+	struct spnego_state *spnego_state = gensec_security->private_data;
+
+	if (spnego_state->state_position != SPNEGO_DONE 
+	    && spnego_state->state_position != SPNEGO_FALLBACK) {
+		return 0;
+	}
+	
+	return gensec_sig_size(spnego_state->sub_sec_security);
+}
+
+static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security, 
+					  DATA_BLOB *session_key)
+{
+	struct spnego_state *spnego_state = gensec_security->private_data;
+	if (!spnego_state->sub_sec_security) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
+	return gensec_session_key(spnego_state->sub_sec_security, 
+				  session_key);
+}
+
+static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
+								      struct auth_session_info **session_info) 
+{
+	struct spnego_state *spnego_state = gensec_security->private_data;
+	if (!spnego_state->sub_sec_security) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
+	return gensec_session_info(spnego_state->sub_sec_security, 
+				   session_info);
+}
+
+/** Fallback to another GENSEC mechanism, based on magic strings 
+ *
+ * This is the 'fallback' case, where we don't get SPNEGO, and have to
+ * try all the other options (and hope they all have a magic string
+ * they check)
+*/
+
+static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security, 
+						  struct spnego_state *spnego_state,
+						  TALLOC_CTX *out_mem_ctx, 
+						  const DATA_BLOB in, DATA_BLOB *out) 
+{
+	int i;
+	int num_ops;
+	const struct gensec_security_ops **all_ops = gensec_security_all(&num_ops);
+	for (i=0; i < num_ops; i++) {
+		NTSTATUS nt_status;
+		if (!all_ops[i]->oid) {
+			continue;
+		}
+		if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid) == 0) {
+			continue;
+		}
+
+		nt_status = gensec_subcontext_start(spnego_state, 
+						    gensec_security, 
+						    &spnego_state->sub_sec_security);
+		if (!NT_STATUS_IS_OK(nt_status)) {
+			return nt_status;
+		}
+		/* select the sub context */
+		nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
+						     all_ops[i]->oid);
+		if (!NT_STATUS_IS_OK(nt_status)) {
+			talloc_free(spnego_state->sub_sec_security);
+			spnego_state->sub_sec_security = NULL;
+			continue;
+		}
+		nt_status = gensec_update(spnego_state->sub_sec_security,
+							  out_mem_ctx, in, out);
+		if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+			spnego_state->state_position = SPNEGO_FALLBACK;
+			return nt_status;
+		}
+		talloc_free(spnego_state->sub_sec_security);
+		spnego_state->sub_sec_security = NULL;
+	}
+	DEBUG(1, ("Failed to parse SPNEGO request\n"));
+	return NT_STATUS_INVALID_PARAMETER;
+	
+}
+
+/* 
+   Parse the netTokenInit from the client, to the server.  
+
+   
+*/
+
+static NTSTATUS gensec_spnego_server_parse_negTokenInit(struct gensec_security *gensec_security,
+							struct spnego_state *spnego_state, 
+							TALLOC_CTX *out_mem_ctx, 
+							const char **mechType,
+							const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out) 
+{
+	NTSTATUS nt_status;
+
+	if (!mechType || !mechType[0]) {
+		DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	nt_status = gensec_subcontext_start(spnego_state,
+					    gensec_security,
+					    &spnego_state->sub_sec_security);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		return nt_status;
+	}
+	/* select the sub context */
+	nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
+					     mechType[0]);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		talloc_free(spnego_state->sub_sec_security);
+		spnego_state->sub_sec_security = NULL;
+		return nt_status;
+	}
+
+	if (!unwrapped_in.length) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+		
+	nt_status = gensec_update(spnego_state->sub_sec_security,
+				  out_mem_ctx, 
+				  unwrapped_in,
+				  unwrapped_out);
+
+	if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
+		DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n", 
+			  spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
+		talloc_free(spnego_state->sub_sec_security);
+		spnego_state->sub_sec_security = NULL;
+	}
+	return nt_status;
+}
+
+static NTSTATUS gensec_spnego_client_parse_negTokenInit(struct gensec_security *gensec_security,
+							struct spnego_state *spnego_state, 
+							TALLOC_CTX *out_mem_ctx, 
+							const char **mechType,
+							const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out) 
+{
+	int i;
+	NTSTATUS nt_status;
+	DATA_BLOB null_data_blob = data_blob(NULL,0);
+
+	for (i=0; mechType && mechType[i]; i++) {
+		nt_status = gensec_subcontext_start(spnego_state,
+						    gensec_security,
+						    &spnego_state->sub_sec_security);
+		if (!NT_STATUS_IS_OK(nt_status)) {
+			break;
+		}
+		/* select the sub context */
+		nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
+						     mechType[i]);
+		if (!NT_STATUS_IS_OK(nt_status)) {
+			talloc_free(spnego_state->sub_sec_security);
+			spnego_state->sub_sec_security = NULL;
+			continue;
+		}
+		
+		if (i == 0) {
+			nt_status = gensec_update(spnego_state->sub_sec_security,
+						  out_mem_ctx, 
+						  unwrapped_in,
+						  unwrapped_out);
+		} else {
+			/* only get the helping start blob for the first OID */
+			nt_status = gensec_update(spnego_state->sub_sec_security,
+						  out_mem_ctx, 
+						  null_data_blob, 
+						  unwrapped_out);
+		}
+		if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
+			DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n", 
+				  spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
+			talloc_free(spnego_state->sub_sec_security);
+			spnego_state->sub_sec_security = NULL;
+		}
+		return nt_status;
+	}
+	if (!mechType || !mechType[i]) {
+		DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
+	}
+	return NT_STATUS_INVALID_PARAMETER;
+}
+
+/** create a client negTokenInit 
+ *
+ * This is the case, where the client is the first one who sends data
+*/
+
+static NTSTATUS gensec_spnego_client_negTokenInit(struct gensec_security *gensec_security, 
+						  struct spnego_state *spnego_state,
+						  TALLOC_CTX *out_mem_ctx, 
+						  const DATA_BLOB in, DATA_BLOB *out) 
+{
+	DATA_BLOB null_data_blob = data_blob(NULL,0);
+	NTSTATUS nt_status;
+	const char **mechTypes = NULL;
+	DATA_BLOB unwrapped_out = data_blob(NULL,0);
+
+	mechTypes = gensec_security_oids(out_mem_ctx, GENSEC_OID_SPNEGO);
+
+	if (!mechTypes) {
+		DEBUG(1, ("no GENSEC OID backends available\n"));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	nt_status = gensec_subcontext_start(spnego_state, 
+					    gensec_security, 
+					    &spnego_state->sub_sec_security);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		return nt_status;
+	}
+	/* select our preferred mech */
+	nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
+					     mechTypes[0]);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		talloc_free(spnego_state->sub_sec_security);
+		spnego_state->sub_sec_security = NULL;
+		return nt_status;
+	}
+	nt_status = gensec_update(spnego_state->sub_sec_security,
+				  out_mem_ctx, in, &unwrapped_out);
+	if (NT_STATUS_IS_OK(nt_status) || NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+		struct spnego_data spnego_out;
+		spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
+		spnego_out.negTokenInit.mechTypes = mechTypes;
+		spnego_out.negTokenInit.reqFlags = 0;
+		spnego_out.negTokenInit.mechListMIC = null_data_blob;
+		spnego_out.negTokenInit.mechToken = unwrapped_out;
+		
+		if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
+			DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
+				return NT_STATUS_INVALID_PARAMETER;
+		}
+		
+		/* set next state */
+		spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
+		spnego_state->state_position = SPNEGO_CLIENT_TARG;
+		
+		if (NT_STATUS_IS_OK(nt_status)) {
+			spnego_state->no_response_expected = True;
+		}
+
+		return NT_STATUS_MORE_PROCESSING_REQUIRED;
+	} 
+	talloc_free(spnego_state->sub_sec_security);
+	spnego_state->sub_sec_security = NULL;
+
+	DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
+	return NT_STATUS_INVALID_PARAMETER;
+}
+
+
+/** create a client negTokenTarg 
+ *
+ * This is the case, where the client is the first one who sends data
+*/
+
+static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security, 
+						  struct spnego_state *spnego_state,
+						  TALLOC_CTX *out_mem_ctx, 
+						  NTSTATUS nt_status,
+						  const DATA_BLOB unwrapped_out, DATA_BLOB *out) 
+{
+	struct spnego_data spnego_out;
+	DATA_BLOB null_data_blob = data_blob(NULL, 0);
+
+	/* compose reply */
+	spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
+	spnego_out.negTokenTarg.responseToken = unwrapped_out;
+	spnego_out.negTokenTarg.mechListMIC = null_data_blob;
+	spnego_out.negTokenTarg.supportedMech = NULL;
+
+	if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+		spnego_out.negTokenTarg.supportedMech
+			= spnego_state->sub_sec_security->ops->oid;
+		spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
+		spnego_state->state_position = SPNEGO_SERVER_TARG;
+	} else if (NT_STATUS_IS_OK(nt_status)) {
+		if (unwrapped_out.data) {
+			spnego_out.negTokenTarg.supportedMech
+				= spnego_state->sub_sec_security->ops->oid;
+		}
+		spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
+		spnego_state->state_position = SPNEGO_DONE;
+	} else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
+		if (spnego_state->sub_sec_security) {
+			/* we have a mech, but we just didn't get the input parameter */
+			spnego_out.negTokenTarg.supportedMech
+				= spnego_state->sub_sec_security->ops->oid;
+		} else {
+			const char **mechTypes = gensec_security_oids(out_mem_ctx, GENSEC_OID_SPNEGO);
+			if (!mechTypes) {
+				DEBUG(1, ("no GENSEC OID backends available\n"));
+				return NT_STATUS_INVALID_PARAMETER;
+			}
+
+			nt_status = gensec_subcontext_start(spnego_state, 
+							    gensec_security, 
+							    &spnego_state->sub_sec_security);
+			if (!NT_STATUS_IS_OK(nt_status)) {
+				return nt_status;
+			}
+			/* select our preferred mech */
+			nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
+							     mechTypes[0]);
+			if (!NT_STATUS_IS_OK(nt_status)) {
+				talloc_free(spnego_state->sub_sec_security);
+				spnego_state->sub_sec_security = NULL;
+				return nt_status;
+			}
+
+			/* we should be sending the whole list here */
+			spnego_out.negTokenTarg.supportedMech = mechTypes[0];
+		}
+			
+		spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
+		spnego_state->state_position = SPNEGO_SERVER_TARG;
+		nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
+	} else {
+		spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
+		DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
+		spnego_state->state_position = SPNEGO_DONE;
+	}
+
+	if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
+		DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
+
+	return nt_status;
+}
+
+
+static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx, 
+				     const DATA_BLOB in, DATA_BLOB *out) 
+{
+	struct spnego_state *spnego_state = gensec_security->private_data;
+	DATA_BLOB null_data_blob = data_blob(NULL, 0);
+	DATA_BLOB unwrapped_out = data_blob(NULL, 0);
+	struct spnego_data spnego_out;
+	struct spnego_data spnego;
+
+	ssize_t len;
+
+	*out = data_blob(NULL, 0);
+
+	if (!out_mem_ctx) {
+		out_mem_ctx = spnego_state;
+	}
+
+	/* and switch into the state machine */
+
+	switch (spnego_state->state_position) {
+	case SPNEGO_FALLBACK:
+		return gensec_update(spnego_state->sub_sec_security,
+				     out_mem_ctx, in, out);
+	case SPNEGO_SERVER_START:
+	{
+		if (in.length) {
+			NTSTATUS nt_status;
+
+			len = spnego_read_data(in, &spnego);
+			if (len == -1) {
+				return gensec_spnego_server_try_fallback(gensec_security, spnego_state, out_mem_ctx, in, out);
+			}
+			/* client sent NegTargetInit, we send NegTokenTarg */
+
+			/* OK, so it's real SPNEGO, check the packet's the one we expect */
+			if (spnego.type != spnego_state->expected_packet) {
+				DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type, 
+					  spnego_state->expected_packet));
+				dump_data(1, in.data, in.length);
+				spnego_free_data(&spnego);
+				return NT_STATUS_INVALID_PARAMETER;
+			}
+			
+			nt_status = gensec_spnego_server_parse_negTokenInit(gensec_security,
+								     spnego_state,
+								     out_mem_ctx, 
+								     spnego.negTokenInit.mechTypes,
+								     spnego.negTokenInit.mechToken, 
+								     &unwrapped_out);
+			
+			nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
+								      spnego_state,
+								      out_mem_ctx,
+								      nt_status,
+								      unwrapped_out, 
+								      out);
+			
+			spnego_free_data(&spnego);
+			
+			return nt_status;
+		} else {
+			const char **mechlist = gensec_security_oids(out_mem_ctx, GENSEC_OID_SPNEGO);
+
+			spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
+			spnego_out.negTokenInit.mechTypes = mechlist;
+			spnego_out.negTokenInit.reqFlags = 0;
+			spnego_out.negTokenInit.mechListMIC
+				= data_blob_string_const(talloc_asprintf(out_mem_ctx, "%s$@%s", lp_netbios_name(), lp_realm()));
+			spnego_out.negTokenInit.mechToken = unwrapped_out;
+			
+			if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
+				DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
+				return NT_STATUS_INVALID_PARAMETER;
+			}
+			
+			/* set next state */
+			spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
+			spnego_state->state_position = SPNEGO_SERVER_TARG;
+			
+			return NT_STATUS_MORE_PROCESSING_REQUIRED;
+		}
+	}
+	
+	case SPNEGO_CLIENT_START:
+	{
+		/* The server offers a list of mechanisms */
+		
+		const char *my_mechs[] = {NULL, NULL};
+		NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
+
+		if (!in.length) {
+			/* client to produce negTokenInit */
+			return gensec_spnego_client_negTokenInit(gensec_security, spnego_state, 
+								 out_mem_ctx, in, out);
+		}
+		
+		len = spnego_read_data(in, &spnego);
+		
+		if (len == -1) {
+			DEBUG(1, ("Invalid SPNEGO request:\n"));
+			dump_data(1, in.data, in.length);
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+		
+		/* OK, so it's real SPNEGO, check the packet's the one we expect */
+		if (spnego.type != spnego_state->expected_packet) {
+			DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type, 
+				  spnego_state->expected_packet));
+			dump_data(1, in.data, in.length);
+			spnego_free_data(&spnego);
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+
+		if (spnego.negTokenInit.targetPrincipal) {
+			DEBUG(5, ("Server claims it's principal name is %s (ignored)\n", spnego.negTokenInit.targetPrincipal));
+		}
+
+		nt_status = gensec_spnego_client_parse_negTokenInit(gensec_security,
+							     spnego_state,
+							     out_mem_ctx, 
+							     spnego.negTokenInit.mechTypes,
+							     spnego.negTokenInit.mechToken, 
+							     &unwrapped_out);
+
+		if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
+			spnego_free_data(&spnego);
+			return nt_status;
+		}
+
+		/* compose reply */
+		my_mechs[0] = spnego_state->sub_sec_security->ops->oid;
+		
+		spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
+		spnego_out.negTokenInit.mechTypes = my_mechs;
+		spnego_out.negTokenInit.reqFlags = 0;
+		spnego_out.negTokenInit.mechListMIC = null_data_blob;
+		spnego_out.negTokenInit.mechToken = unwrapped_out;
+		
+		if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
+			DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
+				return NT_STATUS_INVALID_PARAMETER;
+		}
+		
+		/* set next state */
+		spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
+		spnego_state->state_position = SPNEGO_CLIENT_TARG;
+
+		if (NT_STATUS_IS_OK(nt_status)) {
+			spnego_state->no_response_expected = True;
+		}
+		
+		return NT_STATUS_MORE_PROCESSING_REQUIRED;
+	}
+	case SPNEGO_SERVER_TARG:
+	{
+		NTSTATUS nt_status;
+		if (!in.length) {
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+		
+		len = spnego_read_data(in, &spnego);
+		
+		if (len == -1) {
+			DEBUG(1, ("Invalid SPNEGO request:\n"));
+			dump_data(1, in.data, in.length);
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+		
+		/* OK, so it's real SPNEGO, check the packet's the one we expect */
+		if (spnego.type != spnego_state->expected_packet) {
+			DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type, 
+				  spnego_state->expected_packet));
+			dump_data(1, in.data, in.length);
+			spnego_free_data(&spnego);
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+
+		if (!spnego_state->sub_sec_security) {
+			DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+
+		nt_status = gensec_update(spnego_state->sub_sec_security,
+					  out_mem_ctx, 
+					  spnego.negTokenTarg.responseToken,
+					  &unwrapped_out);
+
+		nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
+							      spnego_state,
+							      out_mem_ctx, 
+							      nt_status,
+							      unwrapped_out, 
+							      out);
+
+		spnego_free_data(&spnego);
+		
+		return nt_status;
+	}
+	case SPNEGO_CLIENT_TARG:
+	{
+		NTSTATUS nt_status;
+		if (!in.length) {
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+		
+		len = spnego_read_data(in, &spnego);
+		
+		if (len == -1) {
+			DEBUG(1, ("Invalid SPNEGO request:\n"));
+			dump_data(1, in.data, in.length);
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+		
+		/* OK, so it's real SPNEGO, check the packet's the one we expect */
+		if (spnego.type != spnego_state->expected_packet) {
+			DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type, 
+				  spnego_state->expected_packet));
+			dump_data(1, in.data, in.length);
+			spnego_free_data(&spnego);
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+	
+		if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
+			return NT_STATUS_ACCESS_DENIED;
+		}
+
+		if (spnego_state->no_response_expected) {
+			if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
+				DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
+				nt_status = NT_STATUS_INVALID_PARAMETER;
+			} else if (spnego.negTokenTarg.responseToken.length) {
+				DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
+				nt_status = NT_STATUS_INVALID_PARAMETER;
+			} else {
+				nt_status = NT_STATUS_OK;
+			}
+		} else {
+			nt_status = gensec_update(spnego_state->sub_sec_security,
+						  out_mem_ctx, 
+						  spnego.negTokenTarg.responseToken, 
+						  &unwrapped_out);
+
+			if (NT_STATUS_IS_OK(nt_status)) {
+				spnego_state->no_response_expected = True;
+			}
+		} 
+		
+		spnego_free_data(&spnego);
+
+		if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
+			&& !NT_STATUS_IS_OK(nt_status)) {
+			DEBUG(1, ("SPNEGO(%s) login failed: %s\n", 
+				  spnego_state->sub_sec_security->ops->name, 
+				  nt_errstr(nt_status)));
+			return nt_status;
+		}
+
+		if (unwrapped_out.length) {
+			/* compose reply */
+			spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
+			spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
+			spnego_out.negTokenTarg.supportedMech = NULL;
+			spnego_out.negTokenTarg.responseToken = unwrapped_out;
+			spnego_out.negTokenTarg.mechListMIC = null_data_blob;
+			
+			if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
+				DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
+				return NT_STATUS_INVALID_PARAMETER;
+			}
+		
+			spnego_state->state_position = SPNEGO_CLIENT_TARG;
+			nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
+		} else {
+
+			/* all done - server has accepted, and we agree */
+			*out = null_data_blob;
+
+			if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
+				/* unless of course it did not accept */
+				DEBUG(1,("gensec_update ok but not accepted\n"));
+				nt_status = NT_STATUS_INVALID_PARAMETER;
+			}
+		}
+		
+		spnego_state->state_position = SPNEGO_DONE;
+
+		return nt_status;
+	}
+	case SPNEGO_DONE:
+		return NT_STATUS_OK;
+	}
+	return NT_STATUS_INVALID_PARAMETER;
+}
+
+static BOOL gensec_spnego_have_feature(struct gensec_security *gensec_security,
+				       uint32_t feature) 
+{
+	struct spnego_state *spnego_state = gensec_security->private_data;
+	if (!spnego_state->sub_sec_security) {
+		return False;
+	}
+	
+	return gensec_have_feature(spnego_state->sub_sec_security, 
+				   feature);
+}
+
+static const struct gensec_security_ops gensec_spnego_security_ops = {
+	.name		= "spnego",
+	.sasl_name	= "GSS-SPNEGO",
+	.auth_type	= DCERPC_AUTH_TYPE_SPNEGO,
+	.oid            = GENSEC_OID_SPNEGO,
+	.client_start   = gensec_spnego_client_start,
+	.server_start   = gensec_spnego_server_start,
+	.update 	= gensec_spnego_update,
+	.seal_packet	= gensec_spnego_seal_packet,
+	.sign_packet	= gensec_spnego_sign_packet,
+	.sig_size	= gensec_spnego_sig_size,
+	.check_packet	= gensec_spnego_check_packet,
+	.unseal_packet	= gensec_spnego_unseal_packet,
+	.wrap           = gensec_spnego_wrap,
+	.unwrap         = gensec_spnego_unwrap,
+	.session_key	= gensec_spnego_session_key,
+	.session_info   = gensec_spnego_session_info,
+	.have_feature   = gensec_spnego_have_feature,
+	.enabled        = True
+};
+
+NTSTATUS gensec_spnego_init(void)
+{
+	NTSTATUS ret;
+	ret = gensec_register(&gensec_spnego_security_ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' gensec backend!\n",
+			gensec_spnego_security_ops.name));
+		return ret;
+	}
+
+	return ret;
+}