[SCM] Samba Shared Repository - branch v4-0-test updated
Karolin Seeger
kseeger at samba.org
Mon Apr 7 03:56:06 MDT 2014
The branch, v4-0-test has been updated
via e6ff129 s3: messages: Implement cleanup of dead records.
via b649fdb s3: smbd: Ensure we always go via getgroups_unix_user() when creating an NT token.
from fc185a5 tevent: fix crash bug in tevent_queue_immediate_trigger()
http://gitweb.samba.org/?p=samba.git;a=shortlog;h=v4-0-test
- Log -----------------------------------------------------------------
commit e6ff1291fa940294689d46bd2795281d45fbc07e
Author: Jeremy Allison <jra at samba.org>
Date: Wed Apr 2 16:45:25 2014 -0700
s3: messages: Implement cleanup of dead records.
When a smbd process dies, pending messages.tdb records for this process
might not get cleaned up. Implement a cleanup for dead records that is
triggered after a smbd dies uncleanly; the records for that PID are
deleted.
Based on a patchset from Christof Schmitt <cs at samba.org>.
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Christof Schmitt <cs at samba.org>
(cherry picked from commit 837671f47670b16726aa96ba7a0902974a1037eb)
Bug: https://bugzilla.samba.org/show_bug.cgi?id=10534
Cleanup messages.tdb record after unclean smbd shutdown
Autobuild-User(v4-0-test): Karolin Seeger <kseeger at samba.org>
Autobuild-Date(v4-0-test): Mon Apr 7 11:55:50 CEST 2014 on sn-devel-104
commit b649fdb8d63a5b14bb9dc567de1ddd640ae165f3
Author: Jeremy Allison <jra at samba.org>
Date: Tue Mar 25 08:47:39 2014 -0700
s3: smbd: Ensure we always go via getgroups_unix_user() when creating an NT token.
This has to be done in every code path that creates
an NT token, as remote users may have been added to
the local /etc/group database. Tokens created merely
from the info3 structs (via the DC or via the krb5 PAC)
won't have these local groups.
This code needs to special-case the guest user, as
this token can have the token_sid[0] set to the Guest
SID, not the mapping of UNIX uid -> SID.
Other users that may have a well-known SID
set in token_sid[0] (like SYSTEM) are usually
not mappable to UNIX users and can be ignored
when adding local groups from /etc/group.
Combined back-port of fixes
6034ab521c47fc5f4732398652c9c6847ff92035 and
a9fa09723bee3588db2168ac13f7ad0334452c11 from
master.
https://bugzilla.samba.org/show_bug.cgi?id=10508
Signed-off-by: Jeremy Allison <jra at samba.org>
-----------------------------------------------------------------------
Summary of changes:
source3/auth/token_util.c | 101 ++++++++++++++++++++++++++++++++++++++++++
source3/include/messages.h | 6 +++
source3/lib/messages.c | 17 +++++++
source3/lib/messages_local.c | 38 ++++++++++++++++
source3/smbd/server.c | 7 +++
5 files changed, 169 insertions(+), 0 deletions(-)
Changeset truncated at 500 lines:
diff --git a/source3/auth/token_util.c b/source3/auth/token_util.c
index 841bc52..09959f4 100644
--- a/source3/auth/token_util.c
+++ b/source3/auth/token_util.c
@@ -389,6 +389,100 @@ struct security_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
return result;
}
+/***************************************************
+ Merge in any groups from /etc/group.
+***************************************************/
+
+static NTSTATUS add_local_groups(struct security_token *result,
+ bool is_guest)
+{
+ gid_t *gids = NULL;
+ uint32_t getgroups_num_group_sids = 0;
+ struct passwd *pass = NULL;
+ TALLOC_CTX *tmp_ctx = talloc_stackframe();
+ int i;
+
+ if (is_guest) {
+ /*
+ * Guest is a special case. It's always
+ * a user that can be looked up, but
+ * result->sids[0] is set to DOMAIN\Guest.
+ * Lookup by account name instead.
+ */
+ pass = Get_Pwnam_alloc(tmp_ctx, lp_guestaccount());
+ } else {
+ uid_t uid;
+
+ /* For non-guest result->sids[0] is always the user sid. */
+ if (!sid_to_uid(&result->sids[0], &uid)) {
+ /*
+ * Non-mappable SID like SYSTEM.
+ * Can't be in any /etc/group groups.
+ */
+ TALLOC_FREE(tmp_ctx);
+ return NT_STATUS_OK;
+ }
+
+ pass = getpwuid_alloc(tmp_ctx, uid);
+ if (pass == NULL) {
+ DEBUG(1, ("SID %s -> getpwuid(%u) failed\n",
+ sid_string_dbg(&result->sids[0]),
+ (unsigned int)uid));
+ }
+ }
+
+ if (!pass) {
+ TALLOC_FREE(tmp_ctx);
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ /*
+ * Now we must get any groups this user has been
+ * added to in /etc/group and merge them in.
+ * This has to be done in every code path
+ * that creates an NT token, as remote users
+ * may have been added to the local /etc/group
+ * database. Tokens created merely from the
+ * info3 structs (via the DC or via the krb5 PAC)
+ * won't have these local groups. Note the
+ * groups added here will only be UNIX groups
+ * (S-1-22-2-XXXX groups) as getgroups_unix_user()
+ * turns off winbindd before calling getgroups().
+ *
+ * NB. This is duplicating work already
+ * done in the 'unix_user:' case of
+ * create_token_from_sid() but won't
+ * do anything other than be inefficient
+ * in that case.
+ */
+
+ if (!getgroups_unix_user(tmp_ctx, pass->pw_name, pass->pw_gid,
+ &gids, &getgroups_num_group_sids)) {
+ DEBUG(1, ("getgroups_unix_user for user %s failed\n",
+ pass->pw_name));
+ TALLOC_FREE(tmp_ctx);
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ for (i=0; i<getgroups_num_group_sids; i++) {
+ NTSTATUS status;
+ struct dom_sid grp_sid;
+ gid_to_sid(&grp_sid, gids[i]);
+
+ status = add_sid_to_array_unique(result,
+ &grp_sid,
+ &result->sids,
+ &result->num_sids);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(3, ("Failed to add UNIX SID to nt token\n"));
+ TALLOC_FREE(tmp_ctx);
+ return status;
+ }
+ }
+ TALLOC_FREE(tmp_ctx);
+ return NT_STATUS_OK;
+}
+
static NTSTATUS finalize_local_nt_token(struct security_token *result,
bool is_guest)
{
@@ -396,6 +490,13 @@ static NTSTATUS finalize_local_nt_token(struct security_token *result,
gid_t gid;
NTSTATUS status;
+ /* Add any local groups. */
+
+ status = add_local_groups(result, is_guest);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
/* Add in BUILTIN sids */
status = add_sid_to_array(result, &global_sid_World,
diff --git a/source3/include/messages.h b/source3/include/messages.h
index 4b45901..a45f5a5 100644
--- a/source3/include/messages.h
+++ b/source3/include/messages.h
@@ -101,6 +101,9 @@ bool messaging_tdb_parent_init(TALLOC_CTX *mem_ctx);
void *messaging_tdb_event(TALLOC_CTX *mem_ctx, struct messaging_context *msg,
struct tevent_context *ev);
+NTSTATUS messaging_tdb_cleanup(struct messaging_context *msg_ctx,
+ struct server_id pid);
+
NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
TALLOC_CTX *mem_ctx,
struct messaging_backend **presult);
@@ -140,6 +143,9 @@ NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
void messaging_dispatch_rec(struct messaging_context *msg_ctx,
struct messaging_rec *rec);
+void messaging_cleanup_server(struct messaging_context *msg_ctx,
+ struct server_id pid);
+
#include "librpc/gen_ndr/ndr_messaging.h"
#endif
diff --git a/source3/lib/messages.c b/source3/lib/messages.c
index cd763e7..5e738c7 100644
--- a/source3/lib/messages.c
+++ b/source3/lib/messages.c
@@ -397,4 +397,21 @@ void messaging_dispatch_rec(struct messaging_context *msg_ctx,
return;
}
+/*
+ Call when a process has terminated abnormally.
+*/
+void messaging_cleanup_server(struct messaging_context *msg_ctx,
+ struct server_id server)
+{
+ if (server_id_is_disconnected(&server)) {
+ return;
+ }
+
+ if (!procid_is_local(&server)) {
+ return;
+ }
+
+ (void)messaging_tdb_cleanup(msg_ctx, server);
+
+}
/** @} **/
diff --git a/source3/lib/messages_local.c b/source3/lib/messages_local.c
index 6b63d72..859eeb8 100644
--- a/source3/lib/messages_local.c
+++ b/source3/lib/messages_local.c
@@ -45,6 +45,7 @@
#include "includes.h"
#include "system/filesys.h"
#include "messages.h"
+#include "serverid.h"
#include "lib/tdb_wrap/tdb_wrap.h"
#include "lib/param/param.h"
@@ -200,6 +201,43 @@ static TDB_DATA message_key_pid(TALLOC_CTX *mem_ctx, struct server_id pid)
return kbuf;
}
+/*******************************************************************
+ Called when a process has terminated abnormally. Remove all messages
+ pending for it.
+******************************************************************/
+
+NTSTATUS messaging_tdb_cleanup(struct messaging_context *msg_ctx,
+ struct server_id pid)
+{
+ struct messaging_tdb_context *ctx = talloc_get_type(
+ msg_ctx->local->private_data,
+ struct messaging_tdb_context);
+ struct tdb_wrap *tdb = ctx->tdb;
+ TDB_DATA key;
+ TALLOC_CTX *frame = talloc_stackframe();
+
+ key = message_key_pid(frame, pid);
+ /*
+ * We have to lock the key to avoid
+ * races in case the server_id was
+ * re-used and is active (a remote
+ * possibility, true). We only
+ * clean up the database if we
+ * know server_id doesn't exist
+ * while checked under the chainlock.
+ */
+ if (tdb_chainlock(tdb->tdb, key) != 0) {
+ TALLOC_FREE(frame);
+ return NT_STATUS_LOCK_NOT_GRANTED;
+ }
+ if (!serverid_exists(&pid)) {
+ (void)tdb_delete(tdb->tdb, key);
+ }
+ tdb_chainunlock(tdb->tdb, key);
+ TALLOC_FREE(frame);
+ return NT_STATUS_OK;
+}
+
/*
Fetch the messaging array for a process
*/
diff --git a/source3/smbd/server.c b/source3/smbd/server.c
index a86fa48..86c20ba 100644
--- a/source3/smbd/server.c
+++ b/source3/smbd/server.c
@@ -455,6 +455,13 @@ static void remove_child_pid(struct smbd_parent_context *parent,
parent);
DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
}
+
+ /*
+ * Ensure we flush any stored messages
+ * queued for the child process that
+ * terminated uncleanly.
+ */
+ messaging_cleanup_server(parent->msg_ctx, child_id);
}
if (!serverid_deregister(child_id)) {
--
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