r5601: add a gsskrb5 backend that uses lorikeet-heimdal's new gssapi with

GSS_C_DCE_STYLE support, it's just a start and does work correctly yet

metze
(This used to be commit 87ff661703f467db3dfcb33084041c3e2951e0ee)

4 files changed, 607 insertions, 1 deletions

diff --git a/source4/libads/config.m4 b/source4/libads/config.m4
index 2ae82cd745..57416113b3 100644
--- a/source4/libads/config.m4
+++ b/source4/libads/config.m4
@@ -519,7 +519,7 @@ if test x"$with_krb5_support" != x"no"; then
 	fi
 
 	AC_CACHE_CHECK([for krb5_princ_realm returns krb5_realm or krb5_data],
-               samba_cv_KRB5_PRINC_REALM_RETURNS_REALM,[
+    		samba_cv_KRB5_PRINC_REALM_RETURNS_REALM,[
 		AC_TRY_COMPILE([#include <krb5.h>],
 		[krb5_context context;krb5_principal principal;krb5_realm realm;
 			realm = *krb5_princ_realm(context, principal);],
@@ -530,6 +530,14 @@ if test x"$with_krb5_support" != x"no"; then
 		[Whether krb5_princ_realm returns krb5_realm or krb5_data])
 	fi
 
+	# TODO: check all gssapi headers for this
+	AC_CACHE_CHECK([for GSS_C_DCE_STYLE in gssapi.h],
+    		samba_cv_GSS_C_DCE_STYLE,[
+		AC_TRY_COMPILE([#include <gssapi.h>],
+		[int flags = GSS_C_DCE_STYLE;],
+		samba_cv_GSS_C_DCE_STYLE=yes,
+		samba_cv_GSS_C_DCE_STYLE=no)])
+
 	if test x"$ac_cv_lib_ext_krb5_krb5_mk_req_extended" = x"yes"; then
 		AC_DEFINE(HAVE_KRB5,1,[Whether to have KRB5 support])
 		AC_MSG_CHECKING(whether KRB5 support is used)
diff --git a/source4/libcli/auth/gensec.m4 b/source4/libcli/auth/gensec.m4
index 356f857d81..6ccf45ad7e 100644
--- a/source4/libcli/auth/gensec.m4
+++ b/source4/libcli/auth/gensec.m4
@@ -1,8 +1,12 @@
 SMB_MODULE_DEFAULT(gensec_krb5, NOT)
 SMB_MODULE_DEFAULT(gensec_gssapi, NOT)
+SMB_MODULE_DEFAULT(gensec_gsskrb5, NOT)
 
 if test x"$SMB_EXT_LIB_ENABLE_KRB5" = x"YES"; then
 	# enable this when krb5 is fully working
 	SMB_MODULE_DEFAULT(gensec_krb5, STATIC)
 	SMB_MODULE_DEFAULT(gensec_gssapi, STATIC)
+	if test x"$samba_cv_GSS_C_DCE_STYLE" = x"yes"; then
+		SMB_MODULE_DEFAULT(gensec_gsskrb5, STATIC)
+	fi
 fi
diff --git a/source4/libcli/auth/gensec.mk b/source4/libcli/auth/gensec.mk
index b66006ce4f..e4559bb972 100644
--- a/source4/libcli/auth/gensec.mk
+++ b/source4/libcli/auth/gensec.mk
@@ -34,6 +34,16 @@ REQUIRED_SUBSYSTEMS = EXT_LIB_KRB5
 ################################################
 
 ################################################
+# Start MODULE gensec_gsskrb5
+[MODULE::gensec_gsskrb5]
+SUBSYSTEM = GENSEC
+INIT_FUNCTION = gensec_gsskrb5_init
+INIT_OBJ_FILES = libcli/auth/gensec_gsskrb5.o 
+REQUIRED_SUBSYSTEMS = EXT_LIB_KRB5
+# End MODULE gensec_gsskrb5
+################################################
+
+################################################
 # Start MODULE gensec_spnego
 [MODULE::gensec_spnego]
 SUBSYSTEM = GENSEC
diff --git a/source4/libcli/auth/gensec_gsskrb5.c b/source4/libcli/auth/gensec_gsskrb5.c
new file mode 100644
index 0000000000..77e077276b
--- /dev/null
+++ b/source4/libcli/auth/gensec_gsskrb5.c
@@ -0,0 +1,584 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   GSSAPI KRB5 backend for GENSEC
+   
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
+   Copyright (C) Stefan Metzmacher <metze@samba.org> 2005
+
+   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 "system/kerberos.h"
+#include "system/time.h"
+#include "libcli/auth/kerberos.h"
+#include "auth/auth.h"
+
+static const gss_OID_desc gensec_gss_krb5_mechanism_oid_desc =
+			{9, (void *)discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02")};
+
+enum GENSEC_GSSKRB5_STATE {
+	GENSEC_GSSKRB5_CLIENT_START,
+	GENSEC_GSSKRB5_CLIENT_MUTUAL_AUTH,
+	GENSEC_GSSKRB5_CLIENT_DCE_STYLE,
+	GENSEC_GSSKRB5_DONE
+};
+
+struct gensec_gsskrb5_state {
+	enum GENSEC_GSSKRB5_STATE state_position;
+	gss_ctx_id_t gssapi_context;
+	struct gss_channel_bindings_struct *input_chan_bindings;
+	gss_name_t server_name;
+	gss_name_t client_name;
+	OM_uint32 want_flags, got_flags;
+};
+
+static int gensec_gsskrb5_destory(void *ptr) 
+{
+	struct gensec_gsskrb5_state *gensec_gsskrb5_state = ptr;
+	OM_uint32 maj_stat, min_stat;
+
+	if (gensec_gsskrb5_state->gssapi_context != GSS_C_NO_CONTEXT) {
+		maj_stat = gss_delete_sec_context (&min_stat,
+						   &gensec_gsskrb5_state->gssapi_context,
+						   GSS_C_NO_BUFFER);
+	}
+
+	if (gensec_gsskrb5_state->server_name != GSS_C_NO_NAME) {
+		maj_stat = gss_release_name(&min_stat, &gensec_gsskrb5_state->server_name);
+	}
+	if (gensec_gsskrb5_state->client_name != GSS_C_NO_NAME) {
+		maj_stat = gss_release_name(&min_stat, &gensec_gsskrb5_state->client_name);
+	}
+	return 0;
+}
+
+static NTSTATUS gensec_gsskrb5_start(struct gensec_security *gensec_security)
+{
+	struct gensec_gsskrb5_state *gensec_gsskrb5_state;
+
+	gensec_gsskrb5_state = talloc(gensec_security, struct gensec_gsskrb5_state);
+	if (!gensec_gsskrb5_state) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	gensec_security->private_data = gensec_gsskrb5_state;
+
+	gensec_gsskrb5_state->gssapi_context = GSS_C_NO_CONTEXT;
+	gensec_gsskrb5_state->server_name = GSS_C_NO_NAME;
+	gensec_gsskrb5_state->client_name = GSS_C_NO_NAME;
+
+	talloc_set_destructor(gensec_gsskrb5_state, gensec_gsskrb5_destory); 
+
+	/* TODO: Fill in channel bindings */
+	gensec_gsskrb5_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
+	
+	gensec_gsskrb5_state->want_flags = GSS_C_MUTUAL_FLAG;
+	gensec_gsskrb5_state->got_flags = 0;
+
+	if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
+		/* GSSAPI won't give us the session keys */
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
+		gensec_gsskrb5_state->want_flags |= GSS_C_INTEG_FLAG;
+	}
+	if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
+		gensec_gsskrb5_state->want_flags |= GSS_C_CONF_FLAG;
+	}
+	if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
+		gensec_gsskrb5_state->want_flags |= GSS_C_DCE_STYLE;
+	}
+
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_gsskrb5_client_start(struct gensec_security *gensec_security)
+{
+	struct gensec_gsskrb5_state *gensec_gsskrb5_state;
+	NTSTATUS nt_status;
+	gss_buffer_desc name_token;
+	OM_uint32 maj_stat, min_stat;
+
+	gss_OID_desc hostbased = {10, 
+				  (void *)discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12"
+							  "\x01\x02\x01\x04")};
+
+	nt_status = gensec_gsskrb5_start(gensec_security);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		return nt_status;
+	}
+
+	gensec_gsskrb5_state = gensec_security->private_data;
+
+	gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_START;
+
+	name_token.value = talloc_asprintf(gensec_gsskrb5_state, "%s@%s", gensec_get_target_service(gensec_security), 
+					   gensec_get_target_hostname(gensec_security));
+	DEBUG(0, ("name: %s\n", (char *)name_token.value));
+	name_token.length = strlen(name_token.value);
+
+	maj_stat = gss_import_name (&min_stat,
+				    &name_token,
+				    &hostbased,
+				    &gensec_gsskrb5_state->server_name);
+	if (maj_stat) {
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	return NT_STATUS_OK;
+}
+
+/**
+ * Next state function for the GSSKRB5 GENSEC mechanism
+ * 
+ * @param gensec_gsskrb5_state GSSAPI State
+ * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
+ * @param in The request, as a DATA_BLOB
+ * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
+ * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent, 
+ *                or NT_STATUS_OK if the user is authenticated. 
+ */
+
+static NTSTATUS gensec_gsskrb5_update(struct gensec_security *gensec_security, 
+				   TALLOC_CTX *out_mem_ctx, 
+				   const DATA_BLOB in, DATA_BLOB *out) 
+{
+	struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
+	NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
+	OM_uint32 maj_stat, min_stat;
+	OM_uint32 min_stat2;
+	gss_buffer_desc input_token, output_token;
+
+	*out = data_blob(NULL, 0);
+
+	input_token.length = in.length;
+	input_token.value = in.data;
+
+	switch (gensec_gsskrb5_state->state_position) {
+	case GENSEC_GSSKRB5_CLIENT_START:
+	{
+		maj_stat = gss_init_sec_context(&min_stat, 
+						GSS_C_NO_CREDENTIAL, 
+						&gensec_gsskrb5_state->gssapi_context, 
+						gensec_gsskrb5_state->server_name, 
+						discard_const_p(gss_OID_desc, &gensec_gss_krb5_mechanism_oid_desc),
+						gensec_gsskrb5_state->want_flags, 
+						0, 
+						gensec_gsskrb5_state->input_chan_bindings,
+						&input_token, 
+						NULL, 
+						&output_token, 
+						&gensec_gsskrb5_state->got_flags, /* ret flags */
+						NULL);
+		*out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
+		if (out->length != output_token.length) {
+			gss_release_buffer(&min_stat2, &output_token);
+			return NT_STATUS_NO_MEMORY;
+		}
+		gss_release_buffer(&min_stat2, &output_token);
+
+		if (maj_stat == GSS_S_COMPLETE) {
+			gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_DONE;
+			return NT_STATUS_OK;
+		} else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
+			gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_MUTUAL_AUTH;
+			return NT_STATUS_MORE_PROCESSING_REQUIRED;
+		} else {
+			gss_buffer_desc msg1, msg2;
+			OM_uint32 msg_ctx = 0;
+
+			msg1.value = NULL;
+			msg2.value = NULL;
+			gss_display_status(&min_stat2, maj_stat, GSS_C_GSS_CODE,
+					   GSS_C_NULL_OID, &msg_ctx, &msg1);
+			gss_display_status(&min_stat2, min_stat, GSS_C_MECH_CODE,
+					   GSS_C_NULL_OID, &msg_ctx, &msg2);
+			DEBUG(1, ("gensec_gsskrb5_update: %s : %s\n", (char *)msg1.value, (char *)msg2.value));
+			gss_release_buffer(&min_stat2, &msg1);
+			gss_release_buffer(&min_stat2, &msg2);
+
+			return nt_status;
+		}
+		break;
+	}
+	case GENSEC_GSSKRB5_CLIENT_MUTUAL_AUTH:
+	{
+		maj_stat = gss_init_sec_context(&min_stat, 
+						GSS_C_NO_CREDENTIAL, 
+						&gensec_gsskrb5_state->gssapi_context, 
+						gensec_gsskrb5_state->server_name, 
+						discard_const_p(gss_OID_desc, &gensec_gss_krb5_mechanism_oid_desc),
+						gensec_gsskrb5_state->want_flags, 
+						0, 
+						gensec_gsskrb5_state->input_chan_bindings,
+						&input_token, 
+						NULL, 
+						&output_token, 
+						&gensec_gsskrb5_state->got_flags, /* ret flags */
+						NULL);
+		*out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
+		if (out->length != output_token.length) {
+			gss_release_buffer(&min_stat2, &output_token);
+			return NT_STATUS_NO_MEMORY;
+		}
+		gss_release_buffer(&min_stat2, &output_token);
+
+		if (maj_stat == GSS_S_COMPLETE) {
+			if (gensec_gsskrb5_state->got_flags & GSS_C_DCE_STYLE) {
+				gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_DCE_STYLE;
+				return NT_STATUS_MORE_PROCESSING_REQUIRED;	
+			}
+			gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_DONE;
+			return NT_STATUS_OK;
+		} else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
+			gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_DCE_STYLE;
+			return NT_STATUS_MORE_PROCESSING_REQUIRED;
+		} else {
+			gss_buffer_desc msg1, msg2;
+			OM_uint32 msg_ctx = 0;
+
+			msg1.value = NULL;
+			msg2.value = NULL;
+			gss_display_status(&min_stat2, maj_stat, GSS_C_GSS_CODE,
+					   GSS_C_NULL_OID, &msg_ctx, &msg1);
+			gss_display_status(&min_stat2, min_stat, GSS_C_MECH_CODE,
+					   GSS_C_NULL_OID, &msg_ctx, &msg2);
+			DEBUG(1, ("gensec_gsskrb5_update: %s : %s\n", (char *)msg1.value, (char *)msg2.value));
+			gss_release_buffer(&min_stat2, &msg1);
+			gss_release_buffer(&min_stat2, &msg2);
+
+			return nt_status;
+		}
+		break;
+	}
+	case GENSEC_GSSKRB5_CLIENT_DCE_STYLE:
+	{
+		gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_DONE;
+		return NT_STATUS_OK;
+	}
+	case GENSEC_GSSKRB5_DONE:
+	{
+		return NT_STATUS_OK;
+	}
+	default:
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	return NT_STATUS_INVALID_PARAMETER;
+}
+
+static NTSTATUS gensec_gsskrb5_wrap(struct gensec_security *gensec_security, 
+				   TALLOC_CTX *mem_ctx, 
+				   const DATA_BLOB *in, 
+				   DATA_BLOB *out)
+{
+	struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
+	OM_uint32 maj_stat, min_stat;
+	gss_buffer_desc input_token, output_token;
+	int conf_state;
+	input_token.length = in->length;
+	input_token.value = in->data;
+
+	maj_stat = gss_wrap(&min_stat, 
+			    gensec_gsskrb5_state->gssapi_context, 
+			    gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
+			    GSS_C_QOP_DEFAULT,
+			    &input_token,
+			    &conf_state,
+			    &output_token);
+	if (GSS_ERROR(maj_stat)) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+	*out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
+
+	gss_release_buffer(&min_stat, &output_token);
+
+	if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
+	    && !conf_state) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_gsskrb5_unwrap(struct gensec_security *gensec_security, 
+				     TALLOC_CTX *mem_ctx, 
+				     const DATA_BLOB *in, 
+				     DATA_BLOB *out)
+{
+	struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
+	OM_uint32 maj_stat, min_stat;
+	gss_buffer_desc input_token, output_token;
+	int conf_state;
+	gss_qop_t qop_state;
+	input_token.length = in->length;
+	input_token.value = in->data;
+	
+	maj_stat = gss_unwrap(&min_stat, 
+			      gensec_gsskrb5_state->gssapi_context, 
+			      &input_token,
+			      &output_token, 
+			      &conf_state,
+			      &qop_state);
+	if (GSS_ERROR(maj_stat)) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+	*out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
+
+	gss_release_buffer(&min_stat, &output_token);
+	
+	if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
+	    && !conf_state) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+	return NT_STATUS_OK;
+}
+
+static size_t gensec_gsskrb5_sig_size(struct gensec_security *gensec_security) 
+{
+	/* not const but work for DCERPC packets and arcfour */
+	return 45;
+}
+
+static NTSTATUS gensec_gsskrb5_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 gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
+	OM_uint32 maj_stat, min_stat;
+	gss_buffer_desc input_token, output_token;
+	int conf_state;
+	ssize_t sig_length = 0;
+
+	input_token.length = length;
+	input_token.value = data;
+	
+	maj_stat = gss_wrap(&min_stat, 
+			    gensec_gsskrb5_state->gssapi_context,
+			    gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
+			    GSS_C_QOP_DEFAULT,
+			    &input_token,
+			    &conf_state,
+			    &output_token);
+	if (GSS_ERROR(maj_stat)) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	if (output_token.length < length) {
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	sig_length = 45;
+
+	memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
+	*sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
+
+DEBUG(0,("gensec_gsskrb5_seal_packet: siglen: %d inlen: %d, wrap_len: %d\n", sig->length, length, output_token.length - sig_length));
+dump_data(0,sig->data, sig->length);
+dump_data(0,data, length);
+dump_data(0,((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
+
+	gss_release_buffer(&min_stat, &output_token);
+
+	if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
+	    && !conf_state) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_gsskrb5_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 gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
+	OM_uint32 maj_stat, min_stat;
+	gss_buffer_desc input_token, output_token;
+	int conf_state;
+	gss_qop_t qop_state;
+	DATA_BLOB in;
+
+DEBUG(0,("gensec_gsskrb5_unseal_packet: siglen: %d\n", sig->length));
+dump_data(0,sig->data, sig->length);
+
+	in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
+
+	memcpy(in.data, sig->data, sig->length);
+	memcpy(in.data + sig->length, data, length);
+
+	input_token.length = in.length;
+	input_token.value = in.data;
+	
+	maj_stat = gss_unwrap(&min_stat, 
+			      gensec_gsskrb5_state->gssapi_context, 
+			      &input_token,
+			      &output_token, 
+			      &conf_state,
+			      &qop_state);
+	if (GSS_ERROR(maj_stat)) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	if (output_token.length != length) {
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	memcpy(data, output_token.value, length);
+
+	gss_release_buffer(&min_stat, &output_token);
+	
+	if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
+	    && !conf_state) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_gsskrb5_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 gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
+	OM_uint32 maj_stat, min_stat;
+	gss_buffer_desc input_token, output_token;
+	int conf_state;
+	ssize_t sig_length = 0;
+
+	input_token.length = length;
+	input_token.value = data;
+	
+	maj_stat = gss_wrap(&min_stat, 
+			    gensec_gsskrb5_state->gssapi_context,
+			    0,
+			    GSS_C_QOP_DEFAULT,
+			    &input_token,
+			    &conf_state,
+			    &output_token);
+	if (GSS_ERROR(maj_stat)) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	if (output_token.length < length) {
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	sig_length = 45;
+
+	/*memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);*/
+	*sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
+
+DEBUG(0,("gensec_gsskrb5_sign_packet: siglen: %d\n", sig->length));
+dump_data(0,sig->data, sig->length);
+
+	gss_release_buffer(&min_stat, &output_token);
+
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_gsskrb5_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 gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
+	OM_uint32 maj_stat, min_stat;
+	gss_buffer_desc input_token, output_token;
+	int conf_state;
+	gss_qop_t qop_state;
+	DATA_BLOB in;
+
+DEBUG(0,("gensec_gsskrb5_check_packet: siglen: %d\n", sig->length));
+dump_data(0,sig->data, sig->length);
+
+	in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
+
+	memcpy(in.data, sig->data, sig->length);
+	memcpy(in.data + sig->length, data, length);
+
+	input_token.length = in.length;
+	input_token.value = in.data;
+	
+	maj_stat = gss_unwrap(&min_stat, 
+			      gensec_gsskrb5_state->gssapi_context, 
+			      &input_token,
+			      &output_token, 
+			      &conf_state,
+			      &qop_state);
+	if (GSS_ERROR(maj_stat)) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	if (output_token.length != length) {
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	/*memcpy(data, output_token.value, length);*/
+
+	gss_release_buffer(&min_stat, &output_token);
+
+	return NT_STATUS_OK;
+}
+
+static BOOL gensec_gsskrb5_have_feature(struct gensec_security *gensec_security, 
+				       uint32_t feature) 
+{
+	struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
+	if (feature & GENSEC_FEATURE_SIGN) {
+		return gensec_gsskrb5_state->got_flags & GSS_C_INTEG_FLAG;
+	}
+	if (feature & GENSEC_FEATURE_SEAL) {
+		return gensec_gsskrb5_state->got_flags & GSS_C_CONF_FLAG;
+	}
+	return False;
+}
+
+static const struct gensec_security_ops gensec_gsskrb5_security_ops = {
+	.name		= "gsskrb5",
+	.auth_type	= DCERPC_AUTH_TYPE_KRB5,
+	.oid            = GENSEC_OID_KERBEROS5,
+	.client_start   = gensec_gsskrb5_client_start,
+	.update 	= gensec_gsskrb5_update,
+	.sig_size	= gensec_gsskrb5_sig_size,
+	.sign_packet	= gensec_gsskrb5_sign_packet,
+	.check_packet	= gensec_gsskrb5_check_packet,
+	.seal_packet	= gensec_gsskrb5_seal_packet,
+	.unseal_packet	= gensec_gsskrb5_unseal_packet,
+	.wrap           = gensec_gsskrb5_wrap,
+	.unwrap         = gensec_gsskrb5_unwrap,
+	.have_feature   = gensec_gsskrb5_have_feature,
+	.enabled        = False
+};
+
+NTSTATUS gensec_gsskrb5_init(void)
+{
+	NTSTATUS ret;
+
+	ret = gensec_register(&gensec_gsskrb5_security_ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' gensec backend!\n",
+			gensec_gsskrb5_security_ops.name));
+		return ret;
+	}
+
+	return ret;
+}