--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+
+ Map SIDs to uids/gids and back
+
+ Copyright (C) Kai Blin 2008
+
+ 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 "auth/auth.h"
+#include "librpc/gen_ndr/lsa.h"
+#include "librpc/gen_ndr/samr.h"
+#include "librpc/gen_ndr/ndr_security.h"
+#include "lib/ldb/include/ldb.h"
+#include "lib/ldb/include/ldb_errors.h"
+#include "lib/ldb_wrap.h"
+#include "param/param.h"
+#include "winbind/idmap.h"
+#include "libcli/security/proto.h"
+#include "libcli/ldap/ldap_ndr.h"
+
+/**
+ * Get uid/gid bounds from idmap database
+ *
+ * \param idmap_ctx idmap context to use
+ * \param low lower uid/gid bound is stored here
+ * \param high upper uid/gid bound is stored here
+ * \return 0 on success, nonzero on failure
+ */
+static int idmap_get_bounds(struct idmap_context *idmap_ctx, uint32_t *low,
+ uint32_t *high)
+{
+ int ret = -1;
+ struct ldb_context *ldb = idmap_ctx->ldb_ctx;
+ struct ldb_dn *dn;
+ struct ldb_result *res = NULL;
+ TALLOC_CTX *tmp_ctx = talloc_new(idmap_ctx);
+ uint32_t lower_bound = (uint32_t) -1;
+ uint32_t upper_bound = (uint32_t) -1;
+
+ dn = ldb_dn_new(tmp_ctx, ldb, "CN=CONFIG");
+ if (dn == NULL) goto failed;
+
+ ret = ldb_search(ldb, dn, LDB_SCOPE_BASE, NULL, NULL, &res);
+ if (ret != LDB_SUCCESS) goto failed;
+
+ talloc_steal(tmp_ctx, res);
+
+ if (res->count != 1) {
+ ret = -1;
+ goto failed;
+ }
+
+ lower_bound = ldb_msg_find_attr_as_uint(res->msgs[0], "lowerBound", -1);
+ if (lower_bound != (uint32_t) -1) {
+ ret = LDB_SUCCESS;
+ } else {
+ ret = -1;
+ goto failed;
+ }
+
+ upper_bound = ldb_msg_find_attr_as_uint(res->msgs[0], "upperBound", -1);
+ if (upper_bound != (uint32_t) -1) {
+ ret = LDB_SUCCESS;
+ } else {
+ ret = -1;
+ }
+
+failed:
+ talloc_free(tmp_ctx);
+ *low = lower_bound;
+ *high = upper_bound;
+ return ret;
+}
+
+/**
+ * Add a dom_sid structure to a ldb_message
+ * \param idmap_ctx idmap context to use
+ * \param mem_ctx talloc context to use
+ * \param ldb_message ldb message to add dom_sid to
+ * \param attr_name name of the attribute to store the dom_sid in
+ * \param sid dom_sid to store
+ * \return 0 on success, an ldb error code on failure.
+ */
+static int idmap_msg_add_dom_sid(struct idmap_context *idmap_ctx,
+ TALLOC_CTX *mem_ctx, struct ldb_message *msg,
+ const char *attr_name, const struct dom_sid *sid)
+{
+ struct ldb_val val;
+ enum ndr_err_code ndr_err;
+
+ ndr_err = ndr_push_struct_blob(&val, mem_ctx,
+ lp_iconv_convenience(idmap_ctx->lp_ctx),
+ sid,
+ (ndr_push_flags_fn_t)ndr_push_dom_sid);
+
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ return -1;
+ }
+
+ return ldb_msg_add_value(msg, attr_name, &val, NULL);
+}
+
+/**
+ * Get a dom_sid structure from a ldb message.
+ *
+ * \param mem_ctx talloc context to allocate dom_sid memory in
+ * \param msg ldb_message to get dom_sid from
+ * \param attr_name key that has the dom_sid as data
+ * \return dom_sid structure on success, NULL on failure
+ */
+static struct dom_sid *idmap_msg_get_dom_sid(TALLOC_CTX *mem_ctx,
+ struct ldb_message *msg, const char *attr_name)
+{
+ struct dom_sid *sid;
+ const struct ldb_val *val;
+ enum ndr_err_code ndr_err;
+
+ val = ldb_msg_find_ldb_val(msg, attr_name);
+ if (val == NULL) {
+ return NULL;
+ }
+
+ sid = talloc(mem_ctx, struct dom_sid);
+ if (sid == NULL) {
+ return NULL;
+ }
+
+ ndr_err = ndr_pull_struct_blob(val, sid, NULL, sid,
+ (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ talloc_free(sid);
+ return NULL;
+ }
+
+ return sid;
+}
+
+/**
+ * Initialize idmap context
+ *
+ * talloc_free to close.
+ *
+ * \param mem_ctx talloc context to use.
+ * \return allocated idmap_context on success, NULL on error
+ */
+struct idmap_context *idmap_init(TALLOC_CTX *mem_ctx,
+ struct loadparm_context *lp_ctx)
+{
+ struct idmap_context *idmap_ctx;
+
+ idmap_ctx = talloc(mem_ctx, struct idmap_context);
+ if (idmap_ctx == NULL) {
+ return NULL;
+ }
+
+ idmap_ctx->lp_ctx = lp_ctx;
+
+ idmap_ctx->ldb_ctx = ldb_wrap_connect(mem_ctx, lp_ctx,
+ lp_idmap_url(lp_ctx),
+ system_session(mem_ctx, lp_ctx),
+ NULL, 0, NULL);
+ if (idmap_ctx->ldb_ctx == NULL) {
+ return NULL;
+ }
+
+ return idmap_ctx;
+}
+
+/**
+ * Convert a uid to the corresponding SID
+ *
+ * \param idmap_ctx idmap context to use
+ * \param mem_ctx talloc context the memory for the struct dom_sid is allocated
+ * from.
+ * \param uid Unix uid to map to a SID
+ * \param sid Pointer that will take the struct dom_sid pointer if the mapping
+ * succeeds.
+ * \return NT_STATUS_OK on success, NT_STATUS_NONE_MAPPED if mapping not
+ * possible or some other NTSTATUS that is more descriptive on failure.
+ */
+
+NTSTATUS idmap_uid_to_sid(struct idmap_context *idmap_ctx, TALLOC_CTX *mem_ctx,
+ const uid_t uid, struct dom_sid **sid)
+{
+ int ret;
+ NTSTATUS status = NT_STATUS_NONE_MAPPED;
+ struct ldb_context *ldb = idmap_ctx->ldb_ctx;
+ struct ldb_message *msg;
+ struct ldb_result *res = NULL;
+ int trans = -1;
+ uid_t low, high;
+ char *sid_string, *uid_string;
+ struct dom_sid *unix_users_sid, *new_sid;
+ TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+
+ ret = ldb_search_exp_fmt(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
+ NULL, "(&(objectClass=sidMap)(uidNumber=%u))",
+ uid);
+ if (ret != LDB_SUCCESS) {
+ DEBUG(1, ("Search failed: %s\n", ldb_errstring(ldb)));
+ status = NT_STATUS_NONE_MAPPED;
+ goto failed;
+ }
+
+ if (res->count == 1) {
+ *sid = idmap_msg_get_dom_sid(mem_ctx, res->msgs[0],
+ "objectSid");
+ if (*sid == NULL) {
+ DEBUG(1, ("Failed to get sid from db: %u\n", ret));
+ status = NT_STATUS_NONE_MAPPED;
+ goto failed;
+ }
+ talloc_free(tmp_ctx);
+ return NT_STATUS_OK;
+ }
+
+ DEBUG(6, ("uid not found in idmap db, trying to allocate SID.\n"));
+
+ trans = ldb_transaction_start(ldb);
+ if (trans != LDB_SUCCESS) {
+ status = NT_STATUS_NONE_MAPPED;
+ goto failed;
+ }
+
+ /* Now redo the search to make sure noone added a mapping for that SID
+ * while we weren't looking.*/
+ ret = ldb_search_exp_fmt(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
+ NULL, "(&(objectClass=sidMap)(uidNumber=%u))",
+ uid);
+ if (ret != LDB_SUCCESS) {
+ DEBUG(1, ("Search failed: %s\n", ldb_errstring(ldb)));
+ status = NT_STATUS_NONE_MAPPED;
+ goto failed;
+ }
+
+ if (res->count > 0) {
+ DEBUG(1, ("sidMap modified while trying to add a mapping.\n"));
+ status = NT_STATUS_RETRY;
+ goto failed;
+ }
+
+ ret = idmap_get_bounds(idmap_ctx, &low, &high);
+ if (ret != LDB_SUCCESS) {
+ DEBUG(1, ("Failed to get id bounds from db: %u\n", ret));
+ status = NT_STATUS_NONE_MAPPED;
+ goto failed;
+ }
+
+ if (uid >= low && uid <= high) {
+ /* An existing user would have been mapped before */
+ status = NT_STATUS_NO_SUCH_USER;
+ goto failed;
+ }
+
+ /* For local users, we just create a rid = uid +1, so root doesn't end
+ * up with a 0 rid */
+ unix_users_sid = dom_sid_parse_talloc(tmp_ctx, "S-1-22-1");
+ if (unix_users_sid == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto failed;
+ }
+
+ new_sid = dom_sid_add_rid(mem_ctx, unix_users_sid, uid + 1);
+ if (new_sid == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto failed;
+ }
+
+ sid_string = dom_sid_string(tmp_ctx, new_sid);
+ if (sid_string == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto failed;
+ }
+
+ uid_string = talloc_asprintf(tmp_ctx, "%u", uid);
+ if (uid_string == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto failed;
+ }
+
+ msg = ldb_msg_new(tmp_ctx);
+ if (msg == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto failed;
+ }
+
+ msg->dn = ldb_dn_new_fmt(tmp_ctx, ldb, "CN=%s", sid_string);
+ if (msg->dn == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto failed;
+ }
+
+ ret = ldb_msg_add_string(msg, "uidNumber", uid_string);
+ if (ret != LDB_SUCCESS) {
+ status = NT_STATUS_NONE_MAPPED;
+ goto failed;
+ }
+
+ ret = idmap_msg_add_dom_sid(idmap_ctx, tmp_ctx, msg, "objectSid",
+ new_sid);
+ if (ret != LDB_SUCCESS) {
+ status = NT_STATUS_NONE_MAPPED;
+ goto failed;
+ }
+
+ ret = ldb_msg_add_string(msg, "objectClass", "sidMap");
+ if (ret != LDB_SUCCESS) {
+ status = NT_STATUS_NONE_MAPPED;
+ goto failed;
+ }
+
+ ret = ldb_msg_add_string(msg, "cn", sid_string);
+ if (ret != LDB_SUCCESS) {
+ status = NT_STATUS_NONE_MAPPED;
+ goto failed;
+ }
+
+ ret = ldb_add(ldb, msg);
+ if (ret != LDB_SUCCESS) {
+ status = NT_STATUS_NONE_MAPPED;
+ goto failed;
+ }
+
+ trans = ldb_transaction_commit(ldb);
+ if (trans != LDB_SUCCESS) {
+ status = NT_STATUS_NONE_MAPPED;
+ goto failed;
+ }
+
+ *sid = new_sid;
+ talloc_free(tmp_ctx);
+ return NT_STATUS_OK;
+
+failed:
+ if (trans == LDB_SUCCESS) ldb_transaction_cancel(ldb);
+ talloc_free(tmp_ctx);
+ return status;
+}
+
+/**
+ * Map a Unix gid to the corresponding SID
+ *
+ * \todo Create a SID from the S-1-22-2 range for unmapped groups
+ *
+ * \param idmap_ctx idmap context to use
+ * \param mem_ctx talloc context the memory for the struct dom_sid is allocated
+ * from.
+ * \param gid Unix gid to map to a SID
+ * \param sid Pointer that will take the struct dom_sid pointer if mapping
+ * succeeds.
+ * \return NT_STATUS_OK on success, NT_STATUS_NONE_MAPPED if mapping not
+ * possible or some other NTSTATUS that is more descriptive on failure.
+ */
+NTSTATUS idmap_gid_to_sid(struct idmap_context *idmap_ctx, TALLOC_CTX *mem_ctx,
+ const gid_t gid, struct dom_sid **sid)
+{
+ return NT_STATUS_NONE_MAPPED;
+}
+
+/**
+ * Map a SID to a Unix uid.
+ *
+ * If no mapping exists, a new mapping will be created.
+ *
+ * \todo Create mappings for users not from our primary domain.
+ *
+ * \param idmap_ctx idmap context to use
+ * \param mem_ctx talloc context to use
+ * \param sid SID to map to a Unix uid
+ * \param uid pointer to receive the mapped uid
+ * \return NT_STATUS_OK on success, NT_STATUS_INVALID_SID if the sid is not from
+ * a trusted domain and idmap trusted only = true, NT_STATUS_NONE_MAPPED if the
+ * mapping failed.
+ */
+NTSTATUS idmap_sid_to_uid(struct idmap_context *idmap_ctx, TALLOC_CTX *mem_ctx,
+ const struct dom_sid *sid, uid_t *uid)
+{
+ return NT_STATUS_NONE_MAPPED;
+}
+
+/**
+ * Map a SID to a Unix gid.
+ *
+ * If no mapping exist, a new mapping will be created.
+ *
+ * \todo Create mappings for groups not from our primary domain.
+ *
+ * \param idmap_ctx idmap context to use
+ * \param mem_ctx talloc context to use
+ * \param sid SID to map to a Unix gid
+ * \param gid pointer to receive the mapped gid
+ * \return NT_STATUS_OK on success, NT_STATUS_INVALID_SID if the sid is not from
+ * a trusted domain and idmap trusted only = true, NT_STATUS_NONE_MAPPED if the
+ * mapping failed.
+ */
+NTSTATUS idmap_sid_to_gid(struct idmap_context *idmap_ctx, TALLOC_CTX *mem_ctx,
+ const struct dom_sid *sid, gid_t *gid)
+{
+ return NT_STATUS_NONE_MAPPED;
+}
+
git.samba.org / jelmer / samba4-debian.git / blobdiff