Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 377 insertions, 0 deletions

diff --git a/lib/ldb-samba/ldb_wrap.c b/lib/ldb-samba/ldb_wrap.c
new file mode 100644
index 0000000..cfc8732
--- /dev/null
+++ b/lib/ldb-samba/ldb_wrap.c
@@ -0,0 +1,377 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   LDB wrap functions
+
+   Copyright (C) Andrew Tridgell 2004-2009
+
+   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/>.
+*/
+
+/*
+  the stupidity of the unix fcntl locking design forces us to never
+  allow a database file to be opened twice in the same process. These
+  wrappers provide convenient access to a tdb or ldb, taking advantage
+  of talloc destructors to ensure that only a single open is done
+*/
+
+#include "includes.h"
+#include "lib/events/events.h"
+#include <ldb.h>
+#include <ldb_errors.h>
+#include "lib/ldb-samba/ldif_handlers.h"
+#include "ldb_wrap.h"
+#include "dsdb/samdb/samdb.h"
+#include "dsdb/common/util.h"
+#include "param/param.h"
+#include "../lib/util/dlinklist.h"
+#include "lib/util/util_paths.h"
+#include <tdb.h>
+#include <unistd.h>
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_LDB
+
+/*
+  this is used to catch debug messages from ldb
+*/
+static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
+			   const char *fmt, va_list ap)  PRINTF_ATTRIBUTE(3,0);
+
+static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
+			   const char *fmt, va_list ap)
+{
+	int samba_level = -1;
+	switch (level) {
+	case LDB_DEBUG_FATAL:
+		samba_level = DBGLVL_ERR;
+		break;
+	case LDB_DEBUG_ERROR:
+		samba_level = DBGLVL_WARNING;
+		break;
+	case LDB_DEBUG_WARNING:
+		samba_level = DBGLVL_NOTICE;
+		break;
+	case LDB_DEBUG_TRACE:
+		samba_level = DBGLVL_DEBUG + 1;
+		break;
+
+	};
+	if (CHECK_DEBUGLVL(samba_level)) {
+		char *s = NULL;
+		int ret;
+
+		ret = vasprintf(&s, fmt, ap);
+		if (ret == -1) {
+			return;
+		}
+		DEBUG(samba_level, ("ldb: %s\n", s));
+		free(s);
+	}
+}
+
+
+/*
+  connecting to a ldb can be a relatively expensive operation because
+  of the schema and partition loads. We keep a list of open ldb
+  contexts here, and try to re-use when possible.
+
+  This means callers of ldb_wrap_connect() must use talloc_unlink() or
+  the free of a parent to destroy the context
+ */
+static struct ldb_wrap {
+	struct ldb_wrap *next, *prev;
+	struct ldb_wrap_context {
+		/* the context is what we use to tell if two ldb
+		 * connections are exactly equivalent
+		 */
+		pid_t pid; /* We want to re-open in a new PID due to
+			    * the LMDB backend */
+		const char *url;
+		struct tevent_context *ev;
+		struct loadparm_context *lp_ctx;
+		struct auth_session_info *session_info;
+		struct cli_credentials *credentials;
+		unsigned int flags;
+	} context;
+	struct ldb_context *ldb;
+} *ldb_wrap_list;
+
+/*
+   free a ldb_wrap structure
+ */
+static int ldb_wrap_destructor(struct ldb_wrap *w)
+{
+	DLIST_REMOVE(ldb_wrap_list, w);
+	return 0;
+}
+
+/*
+ * The casefolder for s4's LDB databases - Unicode-safe
+ */
+char *wrap_casefold(void *context, void *mem_ctx, const char *s, size_t n)
+{
+	return strupper_talloc_n(mem_ctx, s, n);
+}
+
+
+ struct ldb_context *samba_ldb_init(TALLOC_CTX *mem_ctx,
+				    struct tevent_context *ev,
+				    struct loadparm_context *lp_ctx,
+				    struct auth_session_info *session_info,
+				    struct cli_credentials *credentials)
+{
+	struct ldb_context *ldb;
+	int ret;
+
+	ldb = ldb_init(mem_ctx, ev);
+	if (ldb == NULL) {
+		return NULL;
+	}
+
+	ldb_set_modules_dir(ldb, modules_path(ldb, "ldb"));
+
+	ldb_set_debug(ldb, ldb_wrap_debug, NULL);
+
+	ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
+
+	if (session_info) {
+		if (ldb_set_opaque(ldb, DSDB_SESSION_INFO, session_info)) {
+			talloc_free(ldb);
+			return NULL;
+		}
+	}
+
+	if (credentials) {
+		if (ldb_set_opaque(ldb, "credentials", credentials)) {
+			talloc_free(ldb);
+			return NULL;
+		}
+	}
+
+	if (ldb_set_opaque(ldb, "loadparm", lp_ctx)) {
+		talloc_free(ldb);
+		return NULL;
+	}
+
+	/* This must be done before we load the schema, as these
+	 * handlers for objectSid and objectGUID etc must take
+	 * precedence over the 'binary attribute' declaration in the
+	 * schema */
+	ret = ldb_register_samba_handlers(ldb);
+	if (ret != LDB_SUCCESS) {
+		talloc_free(ldb);
+		return NULL;
+	}
+
+	/* we usually want Samba databases to be private. If we later
+	   find we need one public, we will need to add a parameter to
+	   ldb_wrap_connect() */
+	ldb_set_create_perms(ldb, 0600);
+
+	return ldb;
+}
+
+ struct ldb_context *ldb_wrap_find(const char *url,
+				   struct tevent_context *ev,
+				   struct loadparm_context *lp_ctx,
+				   struct auth_session_info *session_info,
+				   struct cli_credentials *credentials,
+				   unsigned int flags)
+{
+	pid_t pid = getpid();
+	struct ldb_wrap *w;
+	/* see if we can re-use an existing ldb */
+	for (w=ldb_wrap_list; w; w=w->next) {
+		if (w->context.pid == pid &&
+		    w->context.ev == ev &&
+		    w->context.lp_ctx == lp_ctx &&
+		    w->context.session_info == session_info &&
+		    w->context.credentials == credentials &&
+		    w->context.flags == flags &&
+		    (w->context.url == url || strcmp(w->context.url, url) == 0))
+			return w->ldb;
+	}
+
+	return NULL;
+}
+
+int samba_ldb_connect(struct ldb_context *ldb, struct loadparm_context *lp_ctx,
+		      const char *url, unsigned int flags)
+{
+	int ret;
+	char *real_url = NULL;
+
+	/* allow admins to force non-sync ldb for all databases */
+	if (lpcfg_parm_bool(lp_ctx, NULL, "ldb", "nosync", false)) {
+		flags |= LDB_FLG_NOSYNC;
+	}
+
+	if (DEBUGLVL(10)) {
+		flags |= LDB_FLG_ENABLE_TRACING;
+	}
+
+	real_url = lpcfg_private_path(ldb, lp_ctx, url);
+	if (real_url == NULL) {
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+
+	ret = ldb_connect(ldb, real_url, flags, NULL);
+
+	if (ret != LDB_SUCCESS) {
+		return ret;
+	}
+
+	/* setup for leak detection */
+	ldb_set_opaque(ldb, "wrap_url", real_url);
+
+	return LDB_SUCCESS;
+}
+
+ bool ldb_wrap_add(const char *url, struct tevent_context *ev,
+		   struct loadparm_context *lp_ctx,
+		   struct auth_session_info *session_info,
+		   struct cli_credentials *credentials,
+		   unsigned int flags,
+		   struct ldb_context *ldb)
+{
+	struct ldb_wrap *w;
+	struct ldb_wrap_context c;
+
+	/* add to the list of open ldb contexts */
+	w = talloc(ldb, struct ldb_wrap);
+	if (w == NULL) {
+		return false;
+	}
+
+	c.pid          = getpid();
+	c.url          = url;
+	c.ev           = ev;
+	c.lp_ctx       = lp_ctx;
+	c.session_info = session_info;
+	c.credentials  = credentials;
+	c.flags        = flags;
+
+	w->context = c;
+	w->context.url = talloc_strdup(w, url);
+	if (w->context.url == NULL) {
+		return false;
+	}
+
+	if (session_info) {
+		/* take a reference to the session_info, as it is
+		 * possible for the ldb to live longer than the
+		 * session_info. This happens when a DRS DsBind call
+		 * reuses a handle, but the original connection is
+		 * shutdown. The token for the new connection is still
+		 * valid, so we need the session_info to remain valid for
+		 * ldb modules to use
+		 */
+		if (talloc_reference(w, session_info) == NULL) {
+			return false;
+		}
+	}
+
+	w->ldb = ldb;
+
+	DLIST_ADD(ldb_wrap_list, w);
+
+	talloc_set_destructor(w, ldb_wrap_destructor);
+
+	return true;
+}
+
+
+/*
+  wrapped connection to a ldb database
+  to close just talloc_free() the returned ldb_context
+
+  TODO:  We need an error_string parameter
+ */
+ struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
+				      struct tevent_context *ev,
+				      struct loadparm_context *lp_ctx,
+				      const char *url,
+				      struct auth_session_info *session_info,
+				      struct cli_credentials *credentials,
+				      unsigned int flags)
+{
+	struct ldb_context *ldb;
+	int ret;
+
+	/*
+	 * Unlike samdb_connect_url() do not try and cache the LDB
+	 * handle, get a new one each time.  Only sam.ldb is
+	 * punitively expensive to open and helpful caches like this
+	 * cause challenges (such as if the value for 'private dir'
+	 * changes).
+	 */
+
+	ldb = samba_ldb_init(mem_ctx, ev, lp_ctx, session_info, credentials);
+
+	if (ldb == NULL)
+		return NULL;
+
+	ret = samba_ldb_connect(ldb, lp_ctx, url, flags);
+	if (ret != LDB_SUCCESS) {
+		talloc_free(ldb);
+		return NULL;
+	}
+
+	DEBUG(3,("ldb_wrap open of %s\n", url));
+
+	return ldb;
+}
+
+/*
+  call tdb_reopen_all() in case there is a TDB open so we are
+  not blocked from re-opening it inside ldb_tdb.
+*/
+ void ldb_wrap_fork_hook(void)
+{
+	if (tdb_reopen_all(1) != 0) {
+		smb_panic("tdb_reopen_all failed\n");
+	}
+}
+
+ char *ldb_relative_path(struct ldb_context *ldb,
+			 TALLOC_CTX *mem_ctx,
+			 const char *name)
+{
+	const char *base_url =
+		(const char *)ldb_get_opaque(ldb, "ldb_url");
+	char *path, *p, *full_name;
+	if (name == NULL) {
+		return NULL;
+	}
+	if (strncmp("tdb://", base_url, 6) == 0) {
+		base_url = base_url+6;
+	} else if (strncmp("mdb://", base_url, 6) == 0) {
+		base_url = base_url+6;
+	} else if (strncmp("ldb://", base_url, 6) == 0) {
+		base_url = base_url+6;
+	}
+	path = talloc_strdup(mem_ctx, base_url);
+	if (path == NULL) {
+		return NULL;
+	}
+	if ( (p = strrchr(path, '/')) != NULL) {
+		p[0] = '\0';
+		full_name = talloc_asprintf(mem_ctx, "%s/%s", path, name);
+	} else {
+		full_name = talloc_asprintf(mem_ctx, "./%s", name);
+	}
+	talloc_free(path);
+	return full_name;
+}