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authorKai Blin <kai@samba.org>2008-02-18 14:33:58 +0100
committerKai Blin <kai@samba.org>2008-02-21 11:21:59 +0100
commit895874d9663ccb95883579d145018ec8a8add9c8 (patch)
treeaa1cab86c67be63d53622796b3c6e8f2a9a60263 /source4/winbind
parent2ca1aeb59be0267858c9cd46a04d37d982b79990 (diff)
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idmap: Handle uid->SID mapping
(This used to be commit 6ac6de8476ba036eb041e054bc37e4503dc2fde8)
Diffstat (limited to 'source4/winbind')
-rw-r--r--source4/winbind/config.mk11
-rw-r--r--source4/winbind/idmap.c415
-rw-r--r--source4/winbind/idmap.h33
-rw-r--r--source4/winbind/wb_server.c6
-rw-r--r--source4/winbind/wb_server.h2
-rw-r--r--source4/winbind/wb_uid2sid.c15
6 files changed, 477 insertions, 5 deletions
diff --git a/source4/winbind/config.mk b/source4/winbind/config.mk
index da5b71f2ae..2567d617da 100644
--- a/source4/winbind/config.mk
+++ b/source4/winbind/config.mk
@@ -37,6 +37,7 @@ OBJ_FILES = \
wb_sam_logon.o
PRIVATE_DEPENDENCIES = \
WB_HELPER \
+ IDMAP \
NDR_WINBIND \
process_model \
RPC_NDR_LSA \
@@ -56,3 +57,13 @@ OBJ_FILES = \
PUBLIC_DEPENDENCIES = RPC_NDR_LSA dcerpc_samr
# End SUBSYSTEM WB_HELPER
################################################
+
+################################################
+# Start SUBYSTEM IDMAP
+[SUBSYSTEM::IDMAP]
+PRIVATE_PROTO_HEADER = idmap_proto.h
+OBJ_FILES = \
+ idmap.o
+PUBLIC_DEPENDENCIES = SAMDB_COMMON
+# End SUBSYSTEM IDMAP
+################################################
diff --git a/source4/winbind/idmap.c b/source4/winbind/idmap.c
new file mode 100644
index 0000000000..b14885213e
--- /dev/null
+++ b/source4/winbind/idmap.c
@@ -0,0 +1,415 @@
+/*
+ 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;
+}
+
diff --git a/source4/winbind/idmap.h b/source4/winbind/idmap.h
new file mode 100644
index 0000000000..8781819be0
--- /dev/null
+++ b/source4/winbind/idmap.h
@@ -0,0 +1,33 @@
+/*
+ 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/>.
+*/
+
+#ifndef _IDMAP_H_
+#define _IDMAP_H_
+
+struct idmap_context {
+ struct loadparm_context *lp_ctx;
+ struct ldb_context *ldb_ctx;
+};
+
+#include "winbind/idmap_proto.h"
+
+#endif
+
diff --git a/source4/winbind/wb_server.c b/source4/winbind/wb_server.c
index 9b303f3615..99191f3c6c 100644
--- a/source4/winbind/wb_server.c
+++ b/source4/winbind/wb_server.c
@@ -149,6 +149,12 @@ static void winbind_task_init(struct task_server *task)
return;
}
+ service->idmap_ctx = idmap_init(service, task->lp_ctx);
+ if (service->idmap_ctx == NULL) {
+ task_server_terminate(task, "Failed to load idmap database");
+ return;
+ }
+
/* setup the unprivileged samba3 socket */
listen_socket = talloc(service, struct wbsrv_listen_socket);
if (!listen_socket) goto nomem;
diff --git a/source4/winbind/wb_server.h b/source4/winbind/wb_server.h
index f3cfc18565..ce972932f5 100644
--- a/source4/winbind/wb_server.h
+++ b/source4/winbind/wb_server.h
@@ -21,6 +21,7 @@
#include "nsswitch/winbind_nss_config.h"
#include "nsswitch/winbind_struct_protocol.h"
+#include "winbind/idmap.h"
#include "libnet/libnet.h"
#define WINBINDD_SAMBA3_SOCKET "pipe"
@@ -33,6 +34,7 @@ struct wbsrv_service {
const struct dom_sid *primary_sid;
struct wbsrv_domain *domains;
+ struct idmap_context *idmap_ctx;
};
struct wbsrv_samconn {
diff --git a/source4/winbind/wb_uid2sid.c b/source4/winbind/wb_uid2sid.c
index d7a909fda2..e81d2e4671 100644
--- a/source4/winbind/wb_uid2sid.c
+++ b/source4/winbind/wb_uid2sid.c
@@ -3,7 +3,7 @@
Command backend for wbinfo -U
- Copyright (C) Kai Blin 2007
+ Copyright (C) Kai Blin 2007-2008
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
@@ -25,6 +25,7 @@
#include "smbd/service_task.h"
#include "winbind/wb_helper.h"
#include "libcli/security/proto.h"
+#include "winbind/idmap.h"
struct uid2sid_state {
struct composite_context *ctx;
@@ -50,10 +51,14 @@ struct composite_context *wb_uid2sid_send(TALLOC_CTX *mem_ctx,
result->private_data = state;
state->service = service;
- /* FIXME: This is a stub so far.
- * We cheat by just using the uid as RID with the domain SID.*/
- state->sid = dom_sid_add_rid(result, service->primary_sid, uid);
- if (composite_nomem(state->sid, state->ctx)) return result;
+ state->ctx->status = idmap_uid_to_sid(service->idmap_ctx, mem_ctx, uid,
+ &state->sid);
+ if (NT_STATUS_EQUAL(state->ctx->status, NT_STATUS_RETRY)) {
+ state->ctx->status = idmap_uid_to_sid(service->idmap_ctx,
+ mem_ctx, uid,
+ &state->sid);
+ }
+ if (!composite_is_ok(state->ctx)) return result;
composite_done(state->ctx);
return result;