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-rw-r--r--source3/lib/replace/system/wait.h2
-rw-r--r--source3/nsswitch/wbinfo.c2
-rw-r--r--source3/nsswitch/winbindd.c16
-rw-r--r--source3/nsswitch/winbindd_cache.c230
4 files changed, 248 insertions, 2 deletions
diff --git a/source3/lib/replace/system/wait.h b/source3/lib/replace/system/wait.h
index c2041a5938..47e3e84bb1 100644
--- a/source3/lib/replace/system/wait.h
+++ b/source3/lib/replace/system/wait.h
@@ -36,4 +36,6 @@
#define SIGNAL_CAST (RETSIGTYPE (*)(int))
#endif
+#include <setjmp.h>
+
#endif
diff --git a/source3/nsswitch/wbinfo.c b/source3/nsswitch/wbinfo.c
index ffca4121fa..cabf995042 100644
--- a/source3/nsswitch/wbinfo.c
+++ b/source3/nsswitch/wbinfo.c
@@ -1182,7 +1182,7 @@ enum {
OPT_GROUP_INFO,
};
-int main(int argc, char **argv)
+int main(int argc, char **argv, char **envp)
{
int opt;
diff --git a/source3/nsswitch/winbindd.c b/source3/nsswitch/winbindd.c
index e9e51449d6..41662900ce 100644
--- a/source3/nsswitch/winbindd.c
+++ b/source3/nsswitch/winbindd.c
@@ -879,7 +879,7 @@ static void process_loop(void)
struct winbindd_state server_state; /* Server state information */
-int main(int argc, char **argv)
+int main(int argc, char **argv, char **envp)
{
pstring logfile;
static BOOL Fork = True;
@@ -1022,6 +1022,17 @@ int main(int argc, char **argv)
pidfile_create("winbindd");
+ if (winbindd_validate_cache()) {
+ /* We have a bad cache, but luckily we
+ just deleted it. Restart ourselves */
+ int i;
+ /* Ensure we have no open low fd's. */
+ for (i = 3; i < 100; i++) {
+ close(i);
+ }
+ return execve(argv[0], argv, envp);
+ }
+
#if HAVE_SETPGID
/*
* If we're interactive we want to set our own process group for
@@ -1040,6 +1051,9 @@ int main(int argc, char **argv)
exit(1);
}
+ /* Ensure all cache and idmap caches are consistent
+ before we startup. */
+
/* React on 'smbcontrol winbindd reload-config' in the same way
as to SIGHUP signal */
message_register(MSG_SMB_CONF_UPDATED, msg_reload_services);
diff --git a/source3/nsswitch/winbindd_cache.c b/source3/nsswitch/winbindd_cache.c
index baaa5826bb..e9b0d2e8f9 100644
--- a/source3/nsswitch/winbindd_cache.c
+++ b/source3/nsswitch/winbindd_cache.c
@@ -2594,6 +2594,236 @@ BOOL get_global_winbindd_state_offline(void)
return global_winbindd_offline_state;
}
+/***********************************************************************
+ Validate functions for all possible cache tdb keys.
+***********************************************************************/
+
+static int validate_seqnum(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_ns(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_sn(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_u(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_loc_pol(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_pwd_pol(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_cred(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_ul(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_gl(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_ug(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_ua(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_gm(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+static int validate_trustdoms(TDB_DATA kbuf, TDB_DATA dbuf)
+{
+ return 0;
+}
+
+/***********************************************************************
+ A list of all possible cache tdb keys with associated validation
+ functions.
+***********************************************************************/
+
+struct key_val_struct {
+ const char *keyname;
+ int (*validate_data_fn)(TDB_DATA kbuf, TDB_DATA dbuf);
+} key_val[] = {
+ {"SEQNUM/", validate_seqnum},
+ {"NS/", validate_ns},
+ {"SN/", validate_sn},
+ {"U/", validate_u},
+ {"LOC_POL/", validate_loc_pol},
+ {"PWD_POL/", validate_pwd_pol},
+ {"CRED/", validate_cred},
+ {"UL/", validate_ul},
+ {"GL/", validate_gl},
+ {"UG/", validate_ug},
+ {"UA", validate_ua},
+ {"GM/", validate_gm},
+ {"TRUSTDOMS/", validate_trustdoms},
+ {NULL, NULL}
+};
+
+/***********************************************************************
+ Function to look at every entry in the tdb and validate it as far as
+ possible.
+***********************************************************************/
+
+static int cache_traverse_validate_fn(TDB_CONTEXT *the_tdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
+{
+ int i;
+
+ /* Ensure key is valid. */
+ if (kbuf.dsize < 3) {
+ return 1; /* terminate. */
+ }
+ /* Ensure key is a string. */
+ if (kbuf.dptr[kbuf.dsize] != '\0') {
+ return 1; /* terminate. */
+ }
+
+ for (i = 0; key_val[i].keyname; i++) {
+ if (strncmp(key_val[i].keyname, kbuf.dptr, strlen(key_val[i].keyname)) == 0) {
+ if (key_val[i].validate_data_fn(kbuf, dbuf)) {
+ return 1; /* terminate. */
+ }
+ }
+ }
+ return 0;
+}
+
+/* Handle any signals generated when validating a possibly
+ bad cache tdb. */
+
+static jmp_buf jmpbuf;
+
+#ifdef SIGSEGV
+static void sig_segv(int sig)
+{
+ longjmp(jmpbuf, SIGSEGV);
+}
+#endif
+
+#ifdef SIGBUS
+static void sig_bus(int sig)
+{
+ longjmp(jmpbuf, SIGBUS);
+}
+#endif
+
+#ifdef SIGABRT
+static void sig_abrt(int sig)
+{
+ longjmp(jmpbuf, SIGABRT);
+}
+#endif
+
+/***********************************************************************
+ Try and validate every entry in the winbindd cache. If we fail here,
+ delete the cache tdb and return non-zero - the caller (main winbindd
+ function) will restart us as we don't know if we crashed or not.
+***********************************************************************/
+
+int winbindd_validate_cache(void)
+{
+ BOOL ret = -1;
+ int fd = -1;
+ TDB_CONTEXT *tdb = NULL;
+ const char *cache_path = lock_path("winbindd_cache.tdb");
+
+#ifdef SIGSEGV
+ void (*old_segv_handler)(int) = CatchSignal(SIGSEGV,SIGNAL_CAST sig_segv);
+#endif
+#ifdef SIGBUS
+ void (*old_bus_handler)(int) = CatchSignal(SIGBUS,SIGNAL_CAST sig_bus);
+#endif
+#ifdef SIGABRT
+ void (*old_abrt_handler)(int) = CatchSignal(SIGABRT,SIGNAL_CAST sig_abrt);
+#endif
+
+ switch((ret = setjmp(jmpbuf))) {
+ case 0:
+ ret = -1;
+ break;
+ case SIGSEGV:
+ case SIGBUS:
+ case SIGABRT:
+ default:
+ goto out;
+ }
+
+ tdb = tdb_open_log(cache_path,
+ WINBINDD_CACHE_TDB_DEFAULT_HASH_SIZE,
+ lp_winbind_offline_logon() ? TDB_DEFAULT : (TDB_DEFAULT | TDB_CLEAR_IF_FIRST),
+ O_RDWR|O_CREAT, 0600);
+ if (!tdb) {
+ goto out;
+ }
+
+ fd = tdb_fd(tdb);
+
+ /* Now traverse the cache to validate it. */
+ if (tdb_traverse(tdb, cache_traverse_validate_fn, NULL)) {
+ goto out;
+ }
+
+ DEBUG(10,("winbindd_validate_cache: cache %s is good\n", cache_path));
+ ret = 0; /* Cache is good. */
+
+ out:
+
+ /* Ensure if we segv on exit we use the original
+ handlers to avoid a loop. */
+
+#ifdef SIGSEGV
+ CatchSignal(SIGSEGV,SIGNAL_CAST old_segv_handler);
+#endif
+#ifdef SIGBUS
+ CatchSignal(SIGBUS,SIGNAL_CAST old_bus_handler);
+#endif
+#ifdef SIGABRT
+ CatchSignal(SIGABRT,SIGNAL_CAST old_abrt_handler);
+#endif
+
+ if (tdb) {
+ if (ret == 0) {
+ tdb_close(tdb);
+ } else if (fd != -1) {
+ close(fd);
+ }
+ }
+
+ if (ret) {
+ unlink(cache_path);
+ }
+
+ return ret;
+}
+
/* the cache backend methods are exposed via this structure */
struct winbindd_methods cache_methods = {
True,