1 files changed, 612 insertions, 0 deletions

diff --git a/source3/winbindd/idmap_tdb2.c b/source3/winbindd/idmap_tdb2.c
new file mode 100644
index 0000000..d843aee
--- /dev/null
+++ b/source3/winbindd/idmap_tdb2.c
@@ -0,0 +1,612 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   idmap TDB2 backend, used for clustered Samba setups.
+
+   This uses dbwrap to access tdb files. The location can be set
+   using tdb:idmap2.tdb =" in smb.conf
+
+   Copyright (C) Andrew Tridgell 2007
+
+   This is heavily based upon idmap_tdb.c, which is:
+
+   Copyright (C) Tim Potter 2000
+   Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
+   Copyright (C) Jeremy Allison 2006
+   Copyright (C) Simo Sorce 2003-2006
+   Copyright (C) Michael Adam 2009-2010
+
+   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/filesys.h"
+#include "winbindd.h"
+#include "idmap.h"
+#include "idmap_rw.h"
+#include "dbwrap/dbwrap.h"
+#include "dbwrap/dbwrap_open.h"
+#include "../libcli/security/dom_sid.h"
+#include "util_tdb.h"
+#include "idmap_tdb_common.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_IDMAP
+
+struct idmap_tdb2_context {
+	const char *script; /* script to provide idmaps */
+};
+
+/* High water mark keys */
+#define HWM_GROUP  "GROUP HWM"
+#define HWM_USER   "USER HWM"
+
+/*
+ * check and initialize high/low water marks in the db
+ */
+static NTSTATUS idmap_tdb2_init_hwm(struct idmap_domain *dom)
+{
+	NTSTATUS status;
+	uint32_t low_id;
+	struct idmap_tdb_common_context *ctx;
+
+	ctx = talloc_get_type(dom->private_data,
+			      struct idmap_tdb_common_context);
+
+	/* Create high water marks for group and user id */
+
+	status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_USER, &low_id);
+	if (!NT_STATUS_IS_OK(status) || (low_id < dom->low_id)) {
+		status = dbwrap_trans_store_uint32_bystring(ctx->db, HWM_USER,
+							    dom->low_id);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(0, ("Unable to initialise user hwm in idmap "
+				  "database: %s\n", nt_errstr(status)));
+			return NT_STATUS_INTERNAL_DB_ERROR;
+		}
+	}
+
+	status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_GROUP, &low_id);
+	if (!NT_STATUS_IS_OK(status) || (low_id < dom->low_id)) {
+		status = dbwrap_trans_store_uint32_bystring(ctx->db, HWM_GROUP,
+							    dom->low_id);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(0, ("Unable to initialise group hwm in idmap "
+				  "database: %s\n", nt_errstr(status)));
+			return NT_STATUS_INTERNAL_DB_ERROR;
+		}
+	}
+
+	return NT_STATUS_OK;
+}
+
+
+/*
+  open the permanent tdb
+ */
+static NTSTATUS idmap_tdb2_open_db(struct idmap_domain *dom)
+{
+	char *db_path;
+	struct idmap_tdb_common_context *ctx;
+
+	ctx = talloc_get_type(dom->private_data,
+			      struct idmap_tdb_common_context);
+
+	if (ctx->db) {
+		/* its already open */
+		return NT_STATUS_OK;
+	}
+
+	db_path = talloc_asprintf(NULL, "%s/idmap2.tdb", lp_private_dir());
+	NT_STATUS_HAVE_NO_MEMORY(db_path);
+
+	/* Open idmap repository */
+	ctx->db = db_open(ctx, db_path, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0644,
+			  DBWRAP_LOCK_ORDER_1, DBWRAP_FLAG_NONE);
+	if (ctx->db == NULL) {
+		DEBUG(0, ("Unable to open idmap_tdb2 database '%s'\n",
+			  db_path));
+		TALLOC_FREE(db_path);
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+	TALLOC_FREE(db_path);
+
+	return idmap_tdb2_init_hwm(dom);
+}
+
+/**
+ * store a mapping in the database.
+ */
+
+struct idmap_tdb2_set_mapping_context {
+	const char *ksidstr;
+	const char *kidstr;
+};
+
+static NTSTATUS idmap_tdb2_set_mapping_action(struct db_context *db,
+					      void *private_data)
+{
+	TDB_DATA data;
+	NTSTATUS ret;
+	struct idmap_tdb2_set_mapping_context *state;
+	TALLOC_CTX *tmp_ctx = talloc_stackframe();
+
+	state = (struct idmap_tdb2_set_mapping_context *)private_data;
+
+	DEBUG(10, ("Storing %s <-> %s map\n", state->ksidstr, state->kidstr));
+
+	/* check whether sid mapping is already present in db */
+	ret = dbwrap_fetch_bystring(db, tmp_ctx, state->ksidstr, &data);
+	if (NT_STATUS_IS_OK(ret)) {
+		ret = NT_STATUS_OBJECT_NAME_COLLISION;
+		goto done;
+	}
+
+	ret = dbwrap_store_bystring(db, state->ksidstr,
+				    string_term_tdb_data(state->kidstr),
+				    TDB_INSERT);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0, ("Error storing SID -> ID: %s\n", nt_errstr(ret)));
+		goto done;
+	}
+
+	ret = dbwrap_store_bystring(db, state->kidstr,
+				    string_term_tdb_data(state->ksidstr),
+				    TDB_INSERT);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0, ("Error storing ID -> SID: %s\n", nt_errstr(ret)));
+		/* try to remove the previous stored SID -> ID map */
+		dbwrap_delete_bystring(db, state->ksidstr);
+		goto done;
+	}
+
+	DEBUG(10,("Stored %s <-> %s\n", state->ksidstr, state->kidstr));
+
+done:
+	talloc_free(tmp_ctx);
+	return ret;
+}
+
+static NTSTATUS idmap_tdb2_set_mapping(struct idmap_domain *dom, const struct id_map *map)
+{
+	struct idmap_tdb2_context *ctx;
+	NTSTATUS ret;
+	char *kidstr;
+	struct dom_sid_buf sid_str;
+	struct idmap_tdb_common_context *commonctx;
+	struct idmap_tdb2_set_mapping_context state;
+
+	if (!map || !map->sid) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	kidstr = NULL;
+
+	/* TODO: should we filter a set_mapping using low/high filters ? */
+
+	commonctx = talloc_get_type(dom->private_data,
+				    struct idmap_tdb_common_context);
+
+	ctx = talloc_get_type(commonctx->private_data,
+			      struct idmap_tdb2_context);
+
+	switch (map->xid.type) {
+
+	case ID_TYPE_UID:
+		kidstr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
+		break;
+
+	case ID_TYPE_GID:
+		kidstr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
+		break;
+
+	default:
+		DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	if (kidstr == NULL) {
+		DEBUG(0, ("ERROR: Out of memory!\n"));
+		ret = NT_STATUS_NO_MEMORY;
+		goto done;
+	}
+
+	state.ksidstr = dom_sid_str_buf(map->sid, &sid_str);
+	state.kidstr = kidstr;
+
+	ret = dbwrap_trans_do(commonctx->db, idmap_tdb2_set_mapping_action,
+			      &state);
+
+done:
+	talloc_free(kidstr);
+	return ret;
+}
+
+/*
+  run a script to perform a mapping
+
+  The script should the following command lines:
+
+      SIDTOID S-1-xxxx
+      IDTOSID UID xxxx
+      IDTOSID GID xxxx
+
+  and should return one of the following as a single line of text
+     UID:xxxx
+     GID:xxxx
+     SID:xxxx
+     ERR:xxxx
+ */
+static NTSTATUS idmap_tdb2_script(struct idmap_tdb2_context *ctx,
+				  struct id_map *map, const char *fmt, ...)
+				  PRINTF_ATTRIBUTE(3,4);
+
+static NTSTATUS idmap_tdb2_script(struct idmap_tdb2_context *ctx, struct id_map *map,
+				  const char *fmt, ...)
+{
+	va_list ap;
+	char *cmd;
+	FILE *p;
+	char line[64];
+	unsigned long v;
+
+	cmd = talloc_asprintf(ctx, "%s ", ctx->script);
+	NT_STATUS_HAVE_NO_MEMORY(cmd);
+
+	va_start(ap, fmt);
+	cmd = talloc_vasprintf_append(cmd, fmt, ap);
+	va_end(ap);
+	NT_STATUS_HAVE_NO_MEMORY(cmd);
+
+	p = popen(cmd, "r");
+	talloc_free(cmd);
+	if (p == NULL) {
+		return NT_STATUS_NONE_MAPPED;
+	}
+
+	if (fgets(line, sizeof(line)-1, p) == NULL) {
+		pclose(p);
+		return NT_STATUS_NONE_MAPPED;
+	}
+	pclose(p);
+
+	DEBUG(10,("idmap script gave: %s\n", line));
+
+	if (sscanf(line, "UID:%lu", &v) == 1) {
+		map->xid.id   = v;
+		map->xid.type = ID_TYPE_UID;
+	} else if (sscanf(line, "GID:%lu", &v) == 1) {
+		map->xid.id   = v;
+		map->xid.type = ID_TYPE_GID;
+	} else if (strncmp(line, "SID:S-", 6) == 0) {
+		if (!string_to_sid(map->sid, &line[4])) {
+			DEBUG(0,("Bad SID in '%s' from idmap script %s\n",
+				 line, ctx->script));
+			return NT_STATUS_NONE_MAPPED;
+		}
+	} else {
+		DEBUG(0,("Bad reply '%s' from idmap script %s\n",
+			 line, ctx->script));
+		return NT_STATUS_NONE_MAPPED;
+	}
+
+	return NT_STATUS_OK;
+}
+
+
+
+/*
+  Single id to sid lookup function.
+*/
+static NTSTATUS idmap_tdb2_id_to_sid(struct idmap_domain *dom, struct id_map *map)
+{
+	NTSTATUS ret;
+	TDB_DATA data;
+	char *keystr;
+	NTSTATUS status;
+	struct idmap_tdb_common_context *commonctx;
+	struct idmap_tdb2_context *ctx;
+
+
+	if (!dom || !map) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	status = idmap_tdb2_open_db(dom);
+	NT_STATUS_NOT_OK_RETURN(status);
+
+	commonctx = talloc_get_type(dom->private_data,
+				    struct idmap_tdb_common_context);
+
+	ctx = talloc_get_type(commonctx->private_data,
+			      struct idmap_tdb2_context);
+
+	/* apply filters before checking */
+	if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
+		DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
+				map->xid.id, dom->low_id, dom->high_id));
+		return NT_STATUS_NONE_MAPPED;
+	}
+
+	switch (map->xid.type) {
+
+	case ID_TYPE_UID:
+		keystr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
+		break;
+
+	case ID_TYPE_GID:
+		keystr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
+		break;
+
+	default:
+		DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	if (keystr == NULL) {
+		DEBUG(0, ("Out of memory!\n"));
+		ret = NT_STATUS_NO_MEMORY;
+		goto done;
+	}
+
+	DEBUG(10,("Fetching record %s\n", keystr));
+
+	/* Check if the mapping exists */
+	status = dbwrap_fetch_bystring(commonctx->db, keystr, keystr, &data);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		struct dom_sid_buf sidstr;
+		struct idmap_tdb2_set_mapping_context store_state;
+
+		DEBUG(10,("Record %s not found\n", keystr));
+		if (ctx->script == NULL) {
+			ret = NT_STATUS_NONE_MAPPED;
+			goto done;
+		}
+
+		ret = idmap_tdb2_script(ctx, map, "IDTOSID %s", keystr);
+		if (!NT_STATUS_IS_OK(ret)) {
+			goto done;
+		}
+
+		store_state.ksidstr = dom_sid_str_buf(map->sid, &sidstr);
+		store_state.kidstr = keystr;
+
+		ret = dbwrap_trans_do(commonctx->db,
+				      idmap_tdb2_set_mapping_action,
+				      &store_state);
+		goto done;
+	}
+
+	if (!string_to_sid(map->sid, (const char *)data.dptr)) {
+		DEBUG(10,("INVALID SID (%s) in record %s\n",
+			(const char *)data.dptr, keystr));
+		ret = NT_STATUS_INTERNAL_DB_ERROR;
+		goto done;
+	}
+
+	DEBUG(10,("Found record %s -> %s\n", keystr, (const char *)data.dptr));
+	ret = NT_STATUS_OK;
+
+done:
+	talloc_free(keystr);
+	return ret;
+}
+
+
+/*
+ Single sid to id lookup function.
+*/
+static NTSTATUS idmap_tdb2_sid_to_id(struct idmap_domain *dom, struct id_map *map)
+{
+	NTSTATUS ret;
+	TDB_DATA data;
+	struct dom_sid_buf keystr;
+	unsigned long rec_id = 0;
+	struct idmap_tdb_common_context *commonctx;
+	struct idmap_tdb2_context *ctx;
+	TALLOC_CTX *tmp_ctx = talloc_stackframe();
+
+	ret = idmap_tdb2_open_db(dom);
+	NT_STATUS_NOT_OK_RETURN(ret);
+
+	commonctx = talloc_get_type(dom->private_data,
+				    struct idmap_tdb_common_context);
+
+	ctx = talloc_get_type(commonctx->private_data,
+			      struct idmap_tdb2_context);
+
+	dom_sid_str_buf(map->sid, &keystr);
+
+	DEBUG(10, ("Fetching record %s\n", keystr.buf));
+
+	/* Check if sid is present in database */
+	ret = dbwrap_fetch_bystring(commonctx->db, tmp_ctx, keystr.buf, &data);
+	if (!NT_STATUS_IS_OK(ret)) {
+		char *idstr;
+		struct idmap_tdb2_set_mapping_context store_state;
+
+		DBG_DEBUG("Record %s not found\n", keystr.buf);
+
+		if (ctx->script == NULL) {
+			ret = NT_STATUS_NONE_MAPPED;
+			goto done;
+		}
+
+		ret = idmap_tdb2_script(ctx, map, "SIDTOID %s", keystr.buf);
+		if (!NT_STATUS_IS_OK(ret)) {
+			goto done;
+		}
+
+		/* apply filters before returning result */
+		if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
+			DEBUG(5, ("Script returned id (%u) out of range "
+				  "(%u - %u). Filtered!\n",
+				  map->xid.id, dom->low_id, dom->high_id));
+			ret = NT_STATUS_NONE_MAPPED;
+			goto done;
+		}
+
+		idstr = talloc_asprintf(tmp_ctx, "%cID %lu",
+					map->xid.type == ID_TYPE_UID?'U':'G',
+					(unsigned long)map->xid.id);
+		if (idstr == NULL) {
+			ret = NT_STATUS_NO_MEMORY;
+			goto done;
+		}
+
+		store_state.ksidstr = keystr.buf;
+		store_state.kidstr = idstr;
+
+		ret = dbwrap_trans_do(commonctx->db,
+				      idmap_tdb2_set_mapping_action,
+				      &store_state);
+		goto done;
+	}
+
+	/* What type of record is this ? */
+	if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) { /* Try a UID record. */
+		map->xid.id = rec_id;
+		map->xid.type = ID_TYPE_UID;
+		DBG_DEBUG("Found uid record %s -> %s \n",
+			  keystr.buf,
+			  (const char *)data.dptr );
+		ret = NT_STATUS_OK;
+
+	} else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) { /* Try a GID record. */
+		map->xid.id = rec_id;
+		map->xid.type = ID_TYPE_GID;
+		DBG_DEBUG("Found gid record %s -> %s \n",
+			  keystr.buf,
+			  (const char *)data.dptr );
+		ret = NT_STATUS_OK;
+
+	} else { /* Unknown record type ! */
+		DBG_WARNING("Found INVALID record %s -> %s\n",
+			    keystr.buf,
+			    (const char *)data.dptr);
+		ret = NT_STATUS_INTERNAL_DB_ERROR;
+		goto done;
+	}
+
+	/* apply filters before returning result */
+	if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
+		DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
+				map->xid.id, dom->low_id, dom->high_id));
+		ret = NT_STATUS_NONE_MAPPED;
+	}
+
+done:
+	talloc_free(tmp_ctx);
+	return ret;
+}
+
+/*
+  Initialise idmap database.
+*/
+static NTSTATUS idmap_tdb2_db_init(struct idmap_domain *dom)
+{
+	NTSTATUS ret;
+	struct idmap_tdb_common_context *commonctx;
+	struct idmap_tdb2_context *ctx;
+	const char * idmap_script = NULL;
+	const char *ctx_script = NULL;
+
+	commonctx = talloc_zero(dom, struct idmap_tdb_common_context);
+	if(!commonctx) {
+		DEBUG(0, ("Out of memory!\n"));
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	commonctx->rw_ops = talloc_zero(commonctx, struct idmap_rw_ops);
+	if (commonctx->rw_ops == NULL) {
+		DEBUG(0, ("Out of memory!\n"));
+		ret = NT_STATUS_NO_MEMORY;
+		goto failed;
+	}
+
+	ctx = talloc_zero(commonctx, struct idmap_tdb2_context);
+	if (!ctx) {
+		DEBUG(0, ("Out of memory!\n"));
+		ret = NT_STATUS_NO_MEMORY;
+		goto failed;
+	}
+
+	ctx_script = idmap_config_const_string(dom->name, "script", NULL);
+
+	idmap_script = lp_parm_const_string(-1, "idmap", "script", NULL);
+	if (idmap_script != NULL) {
+		DEBUG(0, ("Warning: 'idmap:script' is deprecated. "
+			  " Please use 'idmap config * : script' instead!\n"));
+	}
+
+	if (strequal(dom->name, "*") && ctx_script == NULL) {
+		/* fall back to idmap:script for backwards compatibility */
+		ctx_script = idmap_script;
+	}
+
+	if (ctx_script) {
+		DEBUG(1, ("using idmap script '%s'\n", ctx_script));
+		/*
+		 * We must ensure this memory is owned by ctx.
+		 * The ctx_script const pointer is a pointer into
+		 * the config file data and may become invalid
+		 * on config file reload. BUG: 13956
+		 */
+		ctx->script = talloc_strdup(ctx, ctx_script);
+		if (ctx->script == NULL) {
+			ret = NT_STATUS_NO_MEMORY;
+			goto failed;
+		}
+	}
+
+	commonctx->max_id = dom->high_id;
+	commonctx->hwmkey_uid = HWM_USER;
+	commonctx->hwmkey_gid = HWM_GROUP;
+
+	commonctx->sid_to_unixid_fn = idmap_tdb2_sid_to_id;
+	commonctx->unixid_to_sid_fn = idmap_tdb2_id_to_sid;
+
+	commonctx->rw_ops->get_new_id = idmap_tdb_common_get_new_id;
+	commonctx->rw_ops->set_mapping = idmap_tdb2_set_mapping;
+
+	commonctx->private_data = ctx;
+	dom->private_data = commonctx;
+
+	ret = idmap_tdb2_open_db(dom);
+	if (!NT_STATUS_IS_OK(ret)) {
+		goto failed;
+	}
+
+	return NT_STATUS_OK;
+
+failed:
+	talloc_free(commonctx);
+	return ret;
+}
+
+
+static const struct idmap_methods db_methods = {
+	.init            = idmap_tdb2_db_init,
+	.unixids_to_sids = idmap_tdb_common_unixids_to_sids,
+	.sids_to_unixids = idmap_tdb_common_sids_to_unixids,
+	.allocate_id     = idmap_tdb_common_get_new_id
+};
+
+static_decl_idmap;
+NTSTATUS idmap_tdb2_init(TALLOC_CTX *ctx)
+{
+	return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb2", &db_methods);
+}