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-rw-r--r--source3/winbindd/idmap_tdb_common.c664
1 files changed, 664 insertions, 0 deletions
diff --git a/source3/winbindd/idmap_tdb_common.c b/source3/winbindd/idmap_tdb_common.c
new file mode 100644
index 0000000..0df8f2f
--- /dev/null
+++ b/source3/winbindd/idmap_tdb_common.c
@@ -0,0 +1,664 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ common functions for TDB based idmapping backends
+
+ Copyright (C) Christian Ambach 2012
+
+ These functions were initially copied over from idmap_tdb.c and idmap_tdb2.c
+ which are:
+
+ 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
+ Copyright (C) Andrew Tridgell 2007
+
+ 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 "idmap_tdb_common.h"
+#include "dbwrap/dbwrap.h"
+#include "util_tdb.h"
+#include "idmap_rw.h"
+#include "../libcli/security/dom_sid.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_IDMAP
+
+struct idmap_tdb_common_allocate_id_context {
+ const char *hwmkey;
+ const char *hwmtype;
+ uint32_t high_hwm;
+ uint32_t hwm;
+};
+
+static NTSTATUS idmap_tdb_common_allocate_id_action(struct db_context *db,
+ void *private_data)
+{
+ NTSTATUS ret;
+ struct idmap_tdb_common_allocate_id_context *state = private_data;
+ uint32_t hwm;
+
+ ret = dbwrap_fetch_uint32_bystring(db, state->hwmkey, &hwm);
+ if (!NT_STATUS_IS_OK(ret)) {
+ ret = NT_STATUS_INTERNAL_DB_ERROR;
+ goto done;
+ }
+
+ /* check it is in the range */
+ if (hwm > state->high_hwm) {
+ DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
+ state->hwmtype, (unsigned long)state->high_hwm));
+ ret = NT_STATUS_UNSUCCESSFUL;
+ goto done;
+ }
+
+ /* fetch a new id and increment it */
+ ret = dbwrap_change_uint32_atomic_bystring(db, state->hwmkey, &hwm, 1);
+ if (!NT_STATUS_IS_OK(ret)) {
+ DEBUG(1, ("Fatal error while fetching a new %s value\n!",
+ state->hwmtype));
+ goto done;
+ }
+
+ /* recheck it is in the range */
+ if (hwm > state->high_hwm) {
+ DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
+ state->hwmtype, (unsigned long)state->high_hwm));
+ ret = NT_STATUS_UNSUCCESSFUL;
+ goto done;
+ }
+
+ ret = NT_STATUS_OK;
+ state->hwm = hwm;
+
+ done:
+ return ret;
+}
+
+static NTSTATUS idmap_tdb_common_allocate_id(struct idmap_domain *dom,
+ struct unixid *xid)
+{
+ const char *hwmkey;
+ const char *hwmtype;
+ uint32_t hwm = 0;
+ NTSTATUS status;
+ struct idmap_tdb_common_allocate_id_context state;
+ struct idmap_tdb_common_context *ctx;
+
+ ctx =
+ talloc_get_type_abort(dom->private_data,
+ struct idmap_tdb_common_context);
+
+ /* Get current high water mark */
+ switch (xid->type) {
+
+ case ID_TYPE_UID:
+ hwmkey = ctx->hwmkey_uid;
+ hwmtype = "UID";
+ break;
+
+ case ID_TYPE_GID:
+ hwmkey = ctx->hwmkey_gid;
+ hwmtype = "GID";
+ break;
+
+ case ID_TYPE_BOTH:
+ /*
+ * This is not supported here yet and
+ * already handled in idmap_rw_new_mapping()
+ */
+ FALL_THROUGH;
+ case ID_TYPE_NOT_SPECIFIED:
+ /*
+ * This is handled in idmap_rw_new_mapping()
+ */
+ FALL_THROUGH;
+ default:
+ DEBUG(2, ("Invalid ID type (0x%x)\n", xid->type));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ state.hwm = hwm;
+ state.high_hwm = ctx->max_id;
+ state.hwmtype = hwmtype;
+ state.hwmkey = hwmkey;
+
+ status = dbwrap_trans_do(ctx->db, idmap_tdb_common_allocate_id_action,
+ &state);
+
+ if (NT_STATUS_IS_OK(status)) {
+ xid->id = state.hwm;
+ DEBUG(10, ("New %s = %d\n", hwmtype, state.hwm));
+ } else {
+ DEBUG(1, ("Error allocating a new %s\n", hwmtype));
+ }
+
+ return status;
+}
+
+/**
+ * Allocate a new unix-ID.
+ * For now this is for the default idmap domain only.
+ * Should be extended later on.
+ */
+NTSTATUS idmap_tdb_common_get_new_id(struct idmap_domain * dom,
+ struct unixid * id)
+{
+ NTSTATUS ret;
+
+ if (!strequal(dom->name, "*")) {
+ DEBUG(3, ("idmap_tdb_common_get_new_id: "
+ "Refusing allocation of a new unixid for domain'%s'. "
+ "Currently only supported for the default "
+ "domain \"*\".\n", dom->name));
+ return NT_STATUS_NOT_IMPLEMENTED;
+ }
+
+ ret = idmap_tdb_common_allocate_id(dom, id);
+
+ return ret;
+}
+
+/**
+ * store a mapping in the database.
+ */
+
+struct idmap_tdb_common_set_mapping_context {
+ const char *ksidstr;
+ const char *kidstr;
+};
+
+static NTSTATUS idmap_tdb_common_set_mapping_action(struct db_context *db,
+ void *private_data)
+{
+ TDB_DATA data;
+ NTSTATUS ret;
+ struct idmap_tdb_common_set_mapping_context *state = private_data;
+ TALLOC_CTX *tmp_ctx = talloc_stackframe();
+
+ 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;
+}
+
+NTSTATUS idmap_tdb_common_set_mapping(struct idmap_domain * dom,
+ const struct id_map * map)
+{
+ struct idmap_tdb_common_context *ctx;
+ struct idmap_tdb_common_set_mapping_context state;
+ NTSTATUS ret;
+ struct dom_sid_buf ksidstr;
+ char *kidstr = NULL;
+
+ if (!map || !map->sid) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ /* TODO: should we filter a set_mapping using low/high filters ? */
+
+ ctx =
+ talloc_get_type_abort(dom->private_data,
+ struct idmap_tdb_common_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: 0x%02x\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, &ksidstr);
+ state.kidstr = kidstr;
+
+ ret = dbwrap_trans_do(ctx->db, idmap_tdb_common_set_mapping_action,
+ &state);
+
+ done:
+ talloc_free(kidstr);
+ return ret;
+}
+
+/*
+ * Create a new mapping for an unmapped SID, also allocating a new ID.
+ * This should be run inside a transaction.
+ *
+ * TODO:
+ * Properly integrate this with multi domain idmap config:
+ * Currently, the allocator is default-config only.
+ */
+NTSTATUS idmap_tdb_common_new_mapping(struct idmap_domain * dom,
+ struct id_map * map)
+{
+ NTSTATUS ret;
+ struct idmap_tdb_common_context *ctx;
+
+ ctx =
+ talloc_get_type_abort(dom->private_data,
+ struct idmap_tdb_common_context);
+
+ ret = idmap_rw_new_mapping(dom, ctx->rw_ops, map);
+
+ return ret;
+}
+
+/*
+ lookup a set of unix ids
+*/
+NTSTATUS idmap_tdb_common_unixids_to_sids(struct idmap_domain * dom,
+ struct id_map ** ids)
+{
+ NTSTATUS ret;
+ size_t i, num_mapped = 0;
+ struct idmap_tdb_common_context *ctx;
+
+ NTSTATUS(*unixid_to_sid_fn) (struct idmap_domain * dom,
+ struct id_map * map);
+ ctx =
+ talloc_get_type_abort(dom->private_data,
+ struct idmap_tdb_common_context);
+
+ if (ctx->unixid_to_sid_fn == NULL) {
+ unixid_to_sid_fn = idmap_tdb_common_unixid_to_sid;
+ } else {
+ unixid_to_sid_fn = ctx->unixid_to_sid_fn;
+ }
+
+ /* initialize the status to avoid surprise */
+ for (i = 0; ids[i]; i++) {
+ ids[i]->status = ID_UNKNOWN;
+ }
+
+ for (i = 0; ids[i]; i++) {
+ ret = unixid_to_sid_fn(dom, ids[i]);
+ if (!NT_STATUS_IS_OK(ret)) {
+
+ /* if it is just a failed mapping continue */
+ if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
+
+ /* make sure it is marked as unmapped */
+ ids[i]->status = ID_UNMAPPED;
+ continue;
+ }
+
+ /* some fatal error occurred, return immediately */
+ goto done;
+ }
+
+ /* all ok, id is mapped */
+ ids[i]->status = ID_MAPPED;
+ num_mapped += 1;
+ }
+
+ ret = NT_STATUS_OK;
+
+done:
+
+ if (NT_STATUS_IS_OK(ret)) {
+ if (i == 0 || num_mapped == 0) {
+ ret = NT_STATUS_NONE_MAPPED;
+ } else if (num_mapped < i) {
+ ret = STATUS_SOME_UNMAPPED;
+ } else {
+ ret = NT_STATUS_OK;
+ }
+ }
+
+ return ret;
+}
+
+/*
+ default single id to sid lookup function
+*/
+NTSTATUS idmap_tdb_common_unixid_to_sid(struct idmap_domain * dom,
+ struct id_map * map)
+{
+ NTSTATUS ret;
+ TDB_DATA data;
+ char *keystr;
+ struct idmap_tdb_common_context *ctx;
+
+ if (!dom || !map) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ ctx =
+ talloc_get_type_abort(dom->private_data,
+ struct idmap_tdb_common_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: 0x%02x\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 */
+ ret = dbwrap_fetch_bystring(ctx->db, keystr, keystr, &data);
+
+ if (!NT_STATUS_IS_OK(ret)) {
+ DEBUG(10, ("Record %s not found\n", keystr));
+ ret = NT_STATUS_NONE_MAPPED;
+ goto done;
+ }
+
+ if ((data.dsize == 0) || (data.dptr[data.dsize-1] != '\0')) {
+ DBG_DEBUG("Invalid record length %zu\n", data.dsize);
+ ret = NT_STATUS_INTERNAL_DB_ERROR;
+ 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.
+**********************************/
+
+NTSTATUS idmap_tdb_common_sid_to_unixid(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 *ctx;
+ TALLOC_CTX *tmp_ctx = talloc_stackframe();
+
+ if (!dom || !map) {
+ talloc_free(tmp_ctx);
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ ctx =
+ talloc_get_type_abort(dom->private_data,
+ struct idmap_tdb_common_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(ctx->db, tmp_ctx, keystr.buf, &data);
+ if (!NT_STATUS_IS_OK(ret)) {
+ DEBUG(10, ("Record %s not found\n", keystr.buf));
+ ret = NT_STATUS_NONE_MAPPED;
+ 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;
+ DEBUG(10,
+ ("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;
+ DEBUG(10,
+ ("Found gid record %s -> %s \n", keystr.buf,
+ (const char *)data.dptr));
+ ret = NT_STATUS_OK;
+
+ } else { /* Unknown record type ! */
+ DEBUG(2,
+ ("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;
+}
+
+/**********************************
+ lookup a set of sids
+**********************************/
+
+struct idmap_tdb_common_sids_to_unixids_context {
+ struct idmap_domain *dom;
+ struct id_map **ids;
+ bool allocate_unmapped;
+ NTSTATUS(*sid_to_unixid_fn) (struct idmap_domain * dom,
+ struct id_map * map);
+};
+
+static NTSTATUS idmap_tdb_common_sids_to_unixids_action(struct db_context *db,
+ void *private_data)
+{
+ struct idmap_tdb_common_sids_to_unixids_context *state = private_data;
+ size_t i, num_mapped = 0, num_required = 0;
+ NTSTATUS ret = NT_STATUS_OK;
+
+ DEBUG(10, ("idmap_tdb_common_sids_to_unixids: "
+ " domain: [%s], allocate: %s\n",
+ state->dom->name, state->allocate_unmapped ? "yes" : "no"));
+
+ for (i = 0; state->ids[i]; i++) {
+ if ((state->ids[i]->status == ID_UNKNOWN) ||
+ /* retry if we could not map in previous run: */
+ (state->ids[i]->status == ID_UNMAPPED)) {
+ NTSTATUS ret2;
+
+ ret2 = state->sid_to_unixid_fn(state->dom,
+ state->ids[i]);
+
+ if (!NT_STATUS_IS_OK(ret2)) {
+
+ /* if it is just a failed mapping, continue */
+ if (NT_STATUS_EQUAL
+ (ret2, NT_STATUS_NONE_MAPPED)) {
+
+ /* make sure it is marked as unmapped */
+ state->ids[i]->status = ID_UNMAPPED;
+ ret = STATUS_SOME_UNMAPPED;
+ } else {
+ /*
+ * some fatal error occurred,
+ * return immediately
+ */
+ ret = ret2;
+ goto done;
+ }
+ } else {
+ /* all ok, id is mapped */
+ state->ids[i]->status = ID_MAPPED;
+ }
+ }
+
+ if (state->ids[i]->status == ID_MAPPED) {
+ num_mapped += 1;
+ }
+
+ if ((state->ids[i]->status == ID_UNMAPPED) &&
+ state->allocate_unmapped) {
+ ret =
+ idmap_tdb_common_new_mapping(state->dom,
+ state->ids[i]);
+ DBG_DEBUG("idmap_tdb_common_new_mapping returned %s\n",
+ nt_errstr(ret));
+ if (NT_STATUS_EQUAL(ret, STATUS_SOME_UNMAPPED)) {
+ if (state->ids[i]->status == ID_REQUIRE_TYPE) {
+ num_required += 1;
+ continue;
+ }
+ }
+ if (!NT_STATUS_IS_OK(ret)) {
+ ret = STATUS_SOME_UNMAPPED;
+ continue;
+ }
+ num_mapped += 1;
+ }
+ }
+
+done:
+
+ if (NT_STATUS_IS_OK(ret) ||
+ NT_STATUS_EQUAL(ret, STATUS_SOME_UNMAPPED)) {
+ if (i == 0 || num_mapped == 0) {
+ ret = NT_STATUS_NONE_MAPPED;
+ } else if (num_mapped < i) {
+ ret = STATUS_SOME_UNMAPPED;
+ } else {
+ ret = NT_STATUS_OK;
+ }
+ if (num_required > 0) {
+ ret = STATUS_SOME_UNMAPPED;
+ }
+ }
+
+ return ret;
+}
+
+NTSTATUS idmap_tdb_common_sids_to_unixids(struct idmap_domain * dom,
+ struct id_map ** ids)
+{
+ NTSTATUS ret;
+ int i;
+ struct idmap_tdb_common_sids_to_unixids_context state;
+ struct idmap_tdb_common_context *ctx;
+
+ ctx =
+ talloc_get_type_abort(dom->private_data,
+ struct idmap_tdb_common_context);
+
+ /* initialize the status to avoid surprise */
+ for (i = 0; ids[i]; i++) {
+ ids[i]->status = ID_UNKNOWN;
+ }
+
+ state.dom = dom;
+ state.ids = ids;
+ state.allocate_unmapped = false;
+ if (ctx->sid_to_unixid_fn == NULL) {
+ state.sid_to_unixid_fn = idmap_tdb_common_sid_to_unixid;
+ } else {
+ state.sid_to_unixid_fn = ctx->sid_to_unixid_fn;
+ }
+
+ ret = idmap_tdb_common_sids_to_unixids_action(ctx->db, &state);
+
+ if ( (NT_STATUS_EQUAL(ret, STATUS_SOME_UNMAPPED) ||
+ NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) &&
+ !dom->read_only) {
+ state.allocate_unmapped = true;
+ ret = dbwrap_trans_do(ctx->db,
+ idmap_tdb_common_sids_to_unixids_action,
+ &state);
+ }
+
+ return ret;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 19:33:00 +0000