r10897: added in a hackish ldb proxy module that I am using to experiment with

mmc management support
(This used to be commit 99a5b088810e8e2f4e28b99a4a0e5e7dc9301594)

3 files changed, 351 insertions, 0 deletions

diff --git a/source4/dsdb/config.mk b/source4/dsdb/config.mk
index 0b03d221ba..e1d5a39c0e 100644
--- a/source4/dsdb/config.mk
+++ b/source4/dsdb/config.mk
@@ -32,6 +32,16 @@ INIT_OBJ_FILES = \
 ################################################
 
 ################################################
+# Start MODULE libldb_proxy
+[MODULE::libldb_proxy]
+SUBSYSTEM = LIBLDB
+INIT_OBJ_FILES = \
+		dsdb/samdb/ldb_modules/proxy.o
+#
+# End MODULE libldb_proxy
+################################################
+
+################################################
 # Start SUBSYSTEM SAMDB
 [SUBSYSTEM::SAMDB]
 INIT_OBJ_FILES = \
diff --git a/source4/dsdb/samdb/ldb_modules/proxy.c b/source4/dsdb/samdb/ldb_modules/proxy.c
new file mode 100644
index 0000000000..4ef5e450aa
--- /dev/null
+++ b/source4/dsdb/samdb/ldb_modules/proxy.c
@@ -0,0 +1,340 @@
+/* 
+   samdb proxy module
+
+   Copyright (C) Andrew Tridgell 2005
+
+     ** NOTE! The following LGPL license applies to the ldb
+     ** library. This does NOT imply that all of Samba is released
+     ** under the LGPL
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/*
+  ldb proxy module. At startup this looks for a record like this:
+
+   dn=@PROXYINFO
+   url=destination url
+   olddn = basedn to proxy in upstream server
+   newdn = basedn in local server
+   username = username to connect to upstream
+   password = password for upstream
+
+   NOTE: this module is a complete hack at this stage. I am committing it just
+   so others can know how I am investigating mmc support
+   
+ */
+
+#include "includes.h"
+#include "ldb/include/ldb.h"
+#include "ldb/include/ldb_private.h"
+#include "lib/cmdline/popt_common.h"
+
+struct proxy_data {
+	struct ldb_context *upstream;
+	struct ldb_dn *olddn;
+	struct ldb_dn *newdn;
+	const char **oldstr;
+	const char **newstr;
+};
+
+
+/*
+  load the @PROXYINFO record
+*/
+static int load_proxy_info(struct ldb_module *module)
+{
+	struct proxy_data *proxy = talloc_get_type(module->private_data, struct proxy_data);
+	struct ldb_dn *dn;
+	struct ldb_message **msg;
+	int res;
+	const char *olddn, *newdn, *url, *username, *password, *oldstr, *newstr;
+	struct cli_credentials *creds;
+	
+
+	/* see if we have already loaded it */
+	if (proxy->upstream != NULL) {
+		return 0;
+	}
+
+	dn = ldb_dn_explode(proxy, "@PROXYINFO");
+	if (dn == NULL) {
+		goto failed;
+	}
+	res = ldb_search(module->ldb, dn, LDB_SCOPE_BASE, NULL, NULL, &msg);
+	talloc_free(dn);
+	if (res != 1) {
+		ldb_debug(module->ldb, LDB_DEBUG_FATAL, "Can't find @PROXYINFO\n");
+		goto failed;
+	}
+
+	url      = ldb_msg_find_string(msg[0], "url", NULL);
+	olddn    = ldb_msg_find_string(msg[0], "olddn", NULL);
+	newdn    = ldb_msg_find_string(msg[0], "newdn", NULL);
+	username = ldb_msg_find_string(msg[0], "username", NULL);
+	password = ldb_msg_find_string(msg[0], "password", NULL);
+	oldstr   = ldb_msg_find_string(msg[0], "oldstr", NULL);
+	newstr   = ldb_msg_find_string(msg[0], "newstr", NULL);
+
+	if (url == NULL || olddn == NULL || newdn == NULL || username == NULL || password == NULL) {
+		ldb_debug(module->ldb, LDB_DEBUG_FATAL, "Need url, olddn, newdn, oldstr, newstr, username and password in @PROXYINFO\n");
+		goto failed;
+	}
+
+	proxy->olddn = ldb_dn_explode(proxy, olddn);
+	if (proxy->olddn == NULL) {
+		ldb_debug(module->ldb, LDB_DEBUG_FATAL, "Failed to explode olddn '%s'\n", olddn);
+		goto failed;
+	}
+	
+	proxy->newdn = ldb_dn_explode(proxy, newdn);
+	if (proxy->newdn == NULL) {
+		ldb_debug(module->ldb, LDB_DEBUG_FATAL, "Failed to explode newdn '%s'\n", newdn);
+		goto failed;
+	}
+
+	proxy->upstream = ldb_init(proxy);
+	if (proxy->upstream == NULL) {
+		ldb_oom(module->ldb);
+		goto failed;
+	}
+
+	proxy->oldstr = str_list_make(proxy, oldstr, ", ");
+	if (proxy->oldstr == NULL) {
+		ldb_oom(module->ldb);
+		goto failed;
+	}
+
+	proxy->newstr = str_list_make(proxy, newstr, ", ");
+	if (proxy->newstr == NULL) {
+		ldb_oom(module->ldb);
+		goto failed;
+	}
+
+	/* setup credentials for connection */
+	creds = cli_credentials_init(proxy->upstream);
+	if (creds == NULL) {
+		ldb_oom(module->ldb);
+		goto failed;
+	}
+	cli_credentials_guess(creds);
+	cli_credentials_set_username(creds, username, CRED_SPECIFIED);
+	cli_credentials_set_password(creds, password, CRED_SPECIFIED);
+
+	ldb_set_opaque(proxy->upstream, "credentials", creds);
+
+	res = ldb_connect(proxy->upstream, url, 0, NULL);
+	if (res != 0) {
+		ldb_debug(module->ldb, LDB_DEBUG_FATAL, "proxy failed to connect to %s\n", url);
+		goto failed;
+	}
+
+	ldb_debug(module->ldb, LDB_DEBUG_TRACE, "proxy connected to %s\n", url);
+
+	talloc_free(msg);
+
+	return 0;
+
+failed:
+	talloc_free(msg);
+	talloc_free(proxy->olddn);
+	talloc_free(proxy->newdn);
+	talloc_free(proxy->upstream);
+	proxy->upstream = NULL;
+	return -1;
+}
+
+
+/*
+  convert a binary blob
+*/
+static void proxy_convert_blob(TALLOC_CTX *mem_ctx, struct ldb_val *v,
+			       const char *oldstr, const char *newstr)
+{
+	int len1, len2, len3;
+	uint8_t *olddata = v->data;
+	char *p = strcasestr((char *)v->data, oldstr);
+
+	len1 = (p - (char *)v->data);
+	len2 = strlen(newstr);
+	len3 = v->length - (p+strlen(oldstr) - (char *)v->data);
+	v->length = len1+len2+len3;
+	v->data = talloc_size(mem_ctx, v->length);
+	memcpy(v->data, olddata, len1);
+	memcpy(v->data+len1, newstr, len2);
+	memcpy(v->data+len1+len2, olddata + len1 + strlen(oldstr), len3);
+}
+
+/*
+  convert a returned value
+*/
+static void proxy_convert_value(struct ldb_module *module, struct ldb_message *msg, struct ldb_val *v)
+{
+	struct proxy_data *proxy = talloc_get_type(module->private_data, struct proxy_data);
+	int i;
+	for (i=0;proxy->oldstr[i];i++) {
+		char *p = strcasestr((char *)v->data, proxy->oldstr[i]);
+		if (p == NULL) continue;
+		proxy_convert_blob(msg, v, proxy->oldstr[i], proxy->newstr[i]);
+	}
+}
+
+
+/*
+  convert a returned value
+*/
+static struct ldb_parse_tree *proxy_convert_tree(struct ldb_module *module, 
+						 struct ldb_parse_tree *tree)
+{
+	struct proxy_data *proxy = talloc_get_type(module->private_data, struct proxy_data);
+	int i;
+	char *expression = ldb_filter_from_tree(module, tree);
+	for (i=0;proxy->newstr[i];i++) {
+		struct ldb_val v;
+		char *p = strcasestr(expression, proxy->newstr[i]);
+		if (p == NULL) continue;
+		v.data = (uint8_t *)expression;
+		v.length = strlen(expression)+1;
+		proxy_convert_blob(module, &v, proxy->newstr[i], proxy->oldstr[i]);
+		return ldb_parse_tree(module, (const char *)v.data);
+	}
+	return tree;
+}
+
+
+
+/*
+  convert a returned record
+*/
+static void proxy_convert_record(struct ldb_module *module, struct ldb_message *msg)
+{
+	struct proxy_data *proxy = talloc_get_type(module->private_data, struct proxy_data);
+	int attr, v;
+	
+	/* fix the message DN */
+	if (ldb_dn_compare_base(module->ldb, proxy->olddn, msg->dn) == 0) {
+		struct ldb_dn *newdn = ldb_dn_copy(msg, msg->dn);
+		newdn->comp_num -= proxy->olddn->comp_num;
+		msg->dn = ldb_dn_compose(msg, newdn, proxy->newdn);
+	}
+
+	/* fix any attributes */
+	for (attr=0;attr<msg->num_elements;attr++) {
+		for (v=0;v<msg->elements[attr].num_values;v++) {
+			proxy_convert_value(module, msg, &msg->elements[attr].values[v]);
+		}
+	}
+
+	/* fix any DN components */
+	for (attr=0;attr<msg->num_elements;attr++) {
+		for (v=0;v<msg->elements[attr].num_values;v++) {
+			proxy_convert_value(module, msg, &msg->elements[attr].values[v]);
+		}
+	}
+}
+
+/* search */
+static int proxy_search_bytree(struct ldb_module *module, const struct ldb_dn *base,
+			       enum ldb_scope scope, struct ldb_parse_tree *tree,
+			       const char * const *attrs, struct ldb_message ***res)
+{
+	struct proxy_data *proxy = talloc_get_type(module->private_data, struct proxy_data);
+	struct ldb_dn *newbase;
+	int ret, i;
+
+	if (base == NULL || (base->comp_num == 1 && base->components[0].name[0] == '@')) {
+		goto passthru;
+	}
+
+	if (load_proxy_info(module) != 0) {
+		return -1;
+	}
+
+	/* see if the dn is within olddn */
+	if (ldb_dn_compare_base(module->ldb, proxy->newdn, base) != 0) {
+		goto passthru;
+	}
+
+	tree = proxy_convert_tree(module, tree);
+
+	/* convert the basedn of this search */
+	newbase = ldb_dn_copy(proxy, base);
+	if (newbase == NULL) {
+		goto failed;
+	}
+	newbase->comp_num -= proxy->newdn->comp_num;
+	newbase = ldb_dn_compose(proxy, newbase, proxy->olddn);
+
+	ldb_debug(module->ldb, LDB_DEBUG_FATAL, "proxying: '%s' with dn '%s' \n", 
+		  ldb_filter_from_tree(proxy, tree), ldb_dn_linearize(proxy, newbase));
+	for (i=0;attrs && attrs[i];i++) {
+		ldb_debug(module->ldb, LDB_DEBUG_FATAL, "attr: '%s'\n", attrs[i]);
+	}
+	
+	ret = ldb_search_bytree(proxy->upstream, newbase, scope, tree, attrs, res);
+	if (ret == -1) {
+		ldb_set_errstring(module, talloc_strdup(module, ldb_errstring(proxy->upstream)));
+		return -1;
+	}
+
+	for (i=0;i<ret;i++) {
+		struct ldb_ldif ldif;
+		printf("# record %d\n", i+1);
+		
+		proxy_convert_record(module, (*res)[i]);
+
+		ldif.changetype = LDB_CHANGETYPE_NONE;
+		ldif.msg = (*res)[i];
+	}
+
+	return ret;
+
+failed:
+	ldb_debug(module->ldb, LDB_DEBUG_TRACE, "proxy failed for %s\n", 
+		  ldb_dn_linearize(proxy, base));
+
+passthru:
+	return ldb_next_search_bytree(module, base, scope, tree, attrs, res); 
+}
+
+
+static const struct ldb_module_ops proxy_ops = {
+	.name		   = "proxy",
+	.search_bytree     = proxy_search_bytree
+};
+
+#ifdef HAVE_DLOPEN_DISABLED
+struct ldb_module *init_module(struct ldb_context *ldb, const char *options[])
+#else
+struct ldb_module *proxy_module_init(struct ldb_context *ldb, const char *options[])
+#endif
+{
+	struct ldb_module *ctx;
+
+	ctx = talloc(ldb, struct ldb_module);
+	if (!ctx)
+		return NULL;
+
+	ctx->ldb = ldb;
+	ctx->prev = ctx->next = NULL;
+	ctx->ops = &proxy_ops;
+
+	ctx->private_data = talloc_zero(ctx, struct proxy_data);
+	if (ctx->private_data == NULL) {
+		return NULL;
+	}
+
+	return ctx;
+}
diff --git a/source4/lib/ldb/common/ldb_modules.c b/source4/lib/ldb/common/ldb_modules.c
index b0ede9893b..5ca666c194 100644
--- a/source4/lib/ldb/common/ldb_modules.c
+++ b/source4/lib/ldb/common/ldb_modules.c
@@ -133,6 +133,7 @@ int ldb_load_modules(struct ldb_context *ldb, const char *options[])
 		{ "objectguid", objectguid_module_init },
 		{ "samldb", samldb_module_init },
 		{ "samba3sam", ldb_samba3sam_module_init },
+		{ "proxy", proxy_module_init },
 #endif
 		{ NULL, NULL }
 	};