s4:kdc add mit plugin code

source4/kdc/config.mk

@@ -60,3 +60,28 @@ PRIVATE_DEPENDENCIES = \
 #######################
 
 DB_GLUE_OBJ_FILES = $(addprefix $(kdcsrcdir)/, db-glue.o)
+
+###############################################################
+# MIT KDC Plugin
+
+#######################
+# Start SUBSYSTEM MIT plugin
+[SUBSYSTEM::MIT_SAMBA]
+PRIVATE_DEPENDENCIES = \
+		LIBLDB auth_sam auth_sam_reply CREDENTIALS \
+		HEIMDAL_HDB DB_GLUE PAC_GLUE LIBSAMBA-HOSTCONFIG
+# End SUBSYSTEM MIT plugin
+#######################
+
+MIT_SAMBA_OBJ_FILES = $(addprefix $(kdcsrcdir)/, mit_samba.o)
+
+###################################
+# Start Library mit_samba
+[LIBRARY::mit_samba]
+PRIVATE_DEPENDENCIES = MIT_SAMBA
+LIBRARY_REALNAME = mit_samba.$(SHLIBEXT)
+OUTPUT_TYPE = SHARED_LIBRARY
+ENABLE = YES
+# End Library mit_samba
+###################################
+

source4/kdc/mit_samba.c

@@ -0,0 +1,374 @@
+/*
+   MIT-Samba4 library
+
+   Copyright (c) 2010, Simo Sorce <idra@samba.org>
+
+   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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+#include "param/param.h"
+#include "dsdb/samdb/samdb.h"
+#include "auth/auth.h"
+#include "auth/credentials/credentials.h"
+#include "system/kerberos.h"
+#include "hdb.h"
+#include "mit_samba_interface.h"
+#include "auth/kerberos/kerberos.h"
+#include "kdc/samba_kdc.h"
+#include "kdc/pac-glue.h"
+#include "kdc/db-glue.h"
+
+const int mit_samba_interface_version = MIT_SAMBA_INTERFACE_VERSION;
+
+struct mit_samba_context {
+	struct auth_session_info *session_info;
+
+	/* for compat with hdb plugin common code */
+	krb5_context context;
+	struct samba_kdc_db_context *db_ctx;
+};
+
+static void mit_samba_context_free(struct mit_samba_context *ctx)
+{
+	/* free heimdal's krb5_context */
+	if (ctx->context) {
+		krb5_free_context(ctx->context);
+	}
+
+	/* then free everything else */
+	talloc_free(ctx);
+}
+
+static int mit_samba_context_init(struct mit_samba_context **_ctx)
+{
+	struct mit_samba_context *ctx;
+	const char *s4_conf_file;
+	int ret;
+
+
+	ctx = talloc(NULL, struct mit_samba_context);
+	if (!ctx) {
+		ret = ENOMEM;
+		goto done;
+	}
+
+	ctx->db_ctx = talloc_zero(ctx, struct samba_kdc_db_context);
+	if (!ctx->db_ctx) {
+		ret = ENOMEM;
+		goto done;
+	}
+
+	ctx->db_ctx->ev_ctx = tevent_context_init(ctx);
+	if (!ctx->db_ctx->ev_ctx) {
+		ret = ENOMEM;
+		goto done;
+	}
+	ctx->db_ctx->lp_ctx = loadparm_init(ctx);
+	if (!ctx->db_ctx->lp_ctx) {
+		ret = ENOMEM;
+		goto done;
+	}
+
+	/* init s4 configuration */
+	s4_conf_file = lp_configfile(ctx->db_ctx->lp_ctx);
+	if (s4_conf_file) {
+		lp_load(ctx->db_ctx->lp_ctx, s4_conf_file);
+	} else {
+		lp_load_default(ctx->db_ctx->lp_ctx);
+	}
+
+	ctx->session_info = system_session(ctx->db_ctx->lp_ctx);
+	if (!ctx->session_info) {
+		ret = EFAULT;
+		goto done;
+	}
+
+	cli_credentials_set_kerberos_state(ctx->session_info->credentials,
+					   CRED_DONT_USE_KERBEROS);
+
+	ctx->db_ctx->ic_ctx = lp_iconv_convenience(ctx->db_ctx->lp_ctx);
+
+	ctx->db_ctx->samdb = samdb_connect(ctx,
+					   ctx->db_ctx->ev_ctx,
+					   ctx->db_ctx->lp_ctx,
+					   ctx->session_info);
+	if (!ctx->db_ctx->samdb) {
+		ret = EFAULT;
+		goto done;
+	}
+
+	/* init heimdal's krb_context and log facilities */
+	ret = smb_krb5_init_context_basic(ctx,
+					  ctx->db_ctx->ev_ctx,
+					  ctx->db_ctx->lp_ctx,
+					  &ctx->context);
+	if (ret) {
+		goto done;
+	}
+
+	ret = 0;
+
+done:
+	if (ret) {
+		mit_samba_context_free(ctx);
+	} else {
+		*_ctx = ctx;
+	}
+	return ret;
+}
+
+
+static int mit_samba_get_principal(struct mit_samba_context *ctx,
+				   char *principal_string,
+				   unsigned int flags,
+				   hdb_entry_ex **_hentry)
+{
+	krb5_principal principal;
+	hdb_entry_ex *hentry;
+	int ret;
+
+	hentry = talloc(ctx, hdb_entry_ex);
+	if (!hentry) {
+		return ENOMEM;
+	}
+
+	ret = krb5_parse_name(ctx->context, principal_string, &principal);
+	if (ret) {
+		goto done;
+	}
+
+	ret = samba_kdc_fetch(ctx->context, ctx->db_ctx,
+			      principal, flags, hentry);
+
+	krb5_free_principal(ctx->context, principal);
+
+done:
+	if (ret) {
+		talloc_free(hentry);
+	} else {
+		talloc_steal(hentry->ctx, hentry);
+		*_hentry = hentry;
+	}
+	return ret;
+}
+
+static int mit_samba_get_firstkey(struct mit_samba_context *ctx,
+				  hdb_entry_ex **_hentry)
+{
+	hdb_entry_ex *hentry;
+	int ret;
+
+	hentry = talloc(ctx, hdb_entry_ex);
+	if (!hentry) {
+		return ENOMEM;
+	}
+
+	ret = samba_kdc_firstkey(ctx->context, ctx->db_ctx, hentry);
+
+	if (ret) {
+		talloc_free(hentry);
+	} else {
+		talloc_steal(hentry->ctx, hentry);
+		*_hentry = hentry;
+	}
+	return ret;
+}
+
+static int mit_samba_get_nextkey(struct mit_samba_context *ctx,
+				 hdb_entry_ex **_hentry)
+{
+	hdb_entry_ex *hentry;
+	int ret;
+
+	hentry = talloc(ctx, hdb_entry_ex);
+	if (!hentry) {
+		return ENOMEM;
+	}
+
+	ret = samba_kdc_nextkey(ctx->context, ctx->db_ctx, hentry);
+
+	if (ret) {
+		talloc_free(hentry);
+	} else {
+		talloc_steal(hentry->ctx, hentry);
+		*_hentry = hentry;
+	}
+	return ret;
+}
+
+static int mit_samba_get_pac_data(struct mit_samba_context *ctx,
+				  hdb_entry_ex *client,
+				  DATA_BLOB *data)
+{
+	TALLOC_CTX *tmp_ctx;
+	DATA_BLOB *pac_blob;
+	NTSTATUS nt_status;
+
+	tmp_ctx = talloc_named(ctx, 0, "mit_samba_get_pac_data context");
+	if (!tmp_ctx) {
+		return ENOMEM;
+	}
+
+	nt_status = samba_kdc_get_pac_blob(tmp_ctx, client, &pac_blob);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		talloc_free(tmp_ctx);
+		return EINVAL;
+	}
+
+	data->data = (uint8_t *)malloc(pac_blob->length);
+	if (!data->data) {
+		talloc_free(tmp_ctx);
+		return ENOMEM;
+	}
+	memcpy(data->data, pac_blob->data, pac_blob->length);
+	data->length = pac_blob->length;
+
+	talloc_free(tmp_ctx);
+	return 0;
+}
+
+static int mit_samba_update_pac_data(struct mit_samba_context *ctx,
+				     hdb_entry_ex *client,
+				     DATA_BLOB *pac_data,
+				     DATA_BLOB *logon_data)
+{
+	TALLOC_CTX *tmp_ctx;
+	DATA_BLOB *logon_blob;
+	krb5_error_code code;
+	NTSTATUS nt_status;
+	krb5_pac pac = NULL;
+	int ret;
+
+	/* The user account may be set not to want the PAC */
+    	if (client && !samba_princ_needs_pac(client)) {
+		return EINVAL;
+	}
+
+	tmp_ctx = talloc_named(ctx, 0, "mit_samba_update_pac_data context");
+	if (!tmp_ctx) {
+		return ENOMEM;
+	}
+
+	logon_blob = talloc_zero(tmp_ctx, DATA_BLOB);
+	if (!logon_blob) {
+		ret = ENOMEM;
+		goto done;
+	}
+
+	code = krb5_pac_parse(ctx->context,
+			      pac_data->data, pac_data->length, &pac);
+	if (code) {
+		ret = EINVAL;
+		goto done;
+	}
+
+	nt_status = samba_kdc_update_pac_blob(tmp_ctx, ctx->context,
+					      ctx->db_ctx->ic_ctx,
+					      &pac, logon_blob);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		DEBUG(0, ("Building PAC failed: %s\n",
+			  nt_errstr(nt_status)));
+		ret = EINVAL;
+		goto done;
+	}
+
+	logon_data->data = (uint8_t *)malloc(logon_blob->length);
+	if (!logon_data->data) {
+		ret = ENOMEM;
+		goto done;
+	}
+	memcpy(logon_data->data, logon_blob->data, logon_blob->length);
+	logon_data->length = logon_blob->length;
+
+	ret = 0;
+
+done:
+	if (pac) krb5_pac_free(ctx->context, pac);
+	talloc_free(tmp_ctx);
+	return ret;
+}
+
+static int mit_samba_check_client_access(struct mit_samba_context *ctx,
+					 hdb_entry_ex *client,
+					 const char *client_name,
+					 hdb_entry_ex *server,
+					 const char *server_name,
+					 const char *netbios_name,
+					 bool password_change,
+					 DATA_BLOB *e_data)
+{
+	struct samba_kdc_entry *kdc_entry;
+	NTSTATUS nt_status;
+
+	kdc_entry = talloc_get_type(client->ctx, struct samba_kdc_entry);
+
+	nt_status = samba_kdc_check_client_access(kdc_entry,
+						  client_name,
+						  netbios_name,
+						  password_change);
+
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
+			return ENOMEM;
+		}
+
+		samba_kdc_build_edata_reply(nt_status, e_data);
+
+		return samba_kdc_map_policy_err(nt_status);
+	}
+
+	return 0;
+}
+
+static int mit_samba_check_s4u2proxy(struct mit_samba_context *ctx,
+				     hdb_entry_ex *entry,
+				     const char *target_name,
+				     bool is_nt_enterprise_name)
+{
+	krb5_principal target_principal;
+	int flags = 0;
+	int ret;
+
+	if (is_nt_enterprise_name) {
+		flags = KRB5_PRINCIPAL_PARSE_ENTERPRISE;
+	}
+
+	ret = krb5_parse_name_flags(ctx->context, target_name,
+				    flags, &target_principal);
+	if (ret) {
+		return ret;
+	}
+
+	ret = samba_kdc_check_constrained_delegation(ctx->context,
+						     ctx->db_ctx,
+						     entry,
+						     target_principal);
+
+	krb5_free_principal(ctx->context, target_principal);
+
+	return ret;
+}
+
+struct mit_samba_function_table mit_samba_function_table = {
+	mit_samba_context_init,
+	mit_samba_context_free,
+	mit_samba_get_principal,
+	mit_samba_get_firstkey,
+	mit_samba_get_nextkey,
+	mit_samba_get_pac_data,
+	mit_samba_update_pac_data,
+	mit_samba_check_client_access,
+	mit_samba_check_s4u2proxy
+};

source4/kdc/mit_samba_interface.h

@@ -0,0 +1,60 @@
+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/*
+ * plugins/kdb/samba/kdb_samba_interface.h
+ *
+ * Copyright (c) 2009, Simo Sorce <idra@samba.org>
+ * All Rights Reserved.
+ *
+ *   Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ *
+ */
+
+#define MIT_SAMBA_INTERFACE_VERSION 1
+
+#ifndef _SAMBA_BUILD_
+typedef struct datablob {
+	uint8_t *data;
+	size_t length;
+} DATA_BLOB;
+#endif
+
+struct mit_samba_context;
+
+struct mit_samba_function_table {
+    int (*init)(struct mit_samba_context **ctx);
+    void (*fini)(struct mit_samba_context *ctx);
+
+    /* db */
+    int (*get_principal)(struct mit_samba_context *, char *,
+                         unsigned int, hdb_entry_ex **);
+    int (*get_firstkey)(struct mit_samba_context *, hdb_entry_ex **);
+    int (*get_nextkey)(struct mit_samba_context *, hdb_entry_ex **);
+
+    /* windc */
+    int (*get_pac)(struct mit_samba_context *, hdb_entry_ex *, DATA_BLOB *);
+    int (*update_pac)(struct mit_samba_context *, hdb_entry_ex *,
+                      DATA_BLOB *, DATA_BLOB *);
+    int (*client_access)(struct mit_samba_context *,
+                         hdb_entry_ex *, const char *,
+                         hdb_entry_ex *, const char *,
+                         const char *, bool, DATA_BLOB *);
+    int (*check_s4u2proxy)(struct mit_samba_context *,
+                           hdb_entry_ex *, const char *, bool);
+};