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nfs-utils/SOURCES/nfs-utils-2.3.3-gssd-multithread-updates.patch
CentOS Sources 729a14eba8 import nfs-utils-2.3.3-41.el8
2021-10-08 14:02:54 +00:00

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29 KiB
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diff --git a/aclocal/libevent.m4 b/aclocal/libevent.m4
index b5ac00ff..0ebcb524 100644
--- a/aclocal/libevent.m4
+++ b/aclocal/libevent.m4
@@ -4,9 +4,13 @@ AC_DEFUN([AC_LIBEVENT], [
dnl Check for libevent, but do not add -levent to LIBS
AC_CHECK_LIB([event], [event_dispatch], [LIBEVENT=-levent],
[AC_MSG_ERROR([libevent not found.])])
+ AC_CHECK_LIB([event_core], [event_base_dispatch], [LIBEVENT=-levent_core],
+ [AC_MSG_ERROR([libevent2 not found.])])
AC_SUBST(LIBEVENT)
AC_CHECK_HEADERS([event.h], ,
[AC_MSG_ERROR([libevent headers not found.])])
+ AC_CHECK_HEADERS([event2/event.h], ,
+ [AC_MSG_ERROR([libevent headers not found.])])
])dnl
diff --git a/utils/gssd/gss_names.c b/utils/gssd/gss_names.c
index 2a7f3a13..982b96f4 100644
--- a/utils/gssd/gss_names.c
+++ b/utils/gssd/gss_names.c
@@ -110,10 +110,12 @@ get_hostbased_client_name(gss_name_t client_name, gss_OID mech,
/* For Kerberos, transform the NT_KRB5_PRINCIPAL name to
* an NT_HOSTBASED_SERVICE name */
if (g_OID_equal(&krb5oid, mech)) {
- if (get_krb5_hostbased_name(&name, &cname) == 0)
- *hostbased_name = cname;
+ if (get_krb5_hostbased_name(&name, &cname) != 0)
+ goto out_rel_buf;
+ *hostbased_name = cname;
} else {
printerr(1, "WARNING: unknown/unsupport mech OID\n");
+ goto out_rel_buf;
}
res = 0;
diff --git a/utils/gssd/gssd.c b/utils/gssd/gssd.c
index af66ed62..6f461fdf 100644
--- a/utils/gssd/gssd.c
+++ b/utils/gssd/gssd.c
@@ -64,7 +64,7 @@
#include <fcntl.h>
#include <dirent.h>
#include <netdb.h>
-#include <event.h>
+#include <event2/event.h>
#include "gssd.h"
#include "err_util.h"
@@ -77,7 +77,7 @@ static char *pipefs_path = GSSD_PIPEFS_DIR;
static DIR *pipefs_dir;
static int pipefs_fd;
static int inotify_fd;
-struct event inotify_ev;
+struct event *inotify_ev;
char *keytabfile = GSSD_DEFAULT_KEYTAB_FILE;
char **ccachesearch;
@@ -90,9 +90,9 @@ char *ccachedir = NULL;
/* Avoid DNS reverse lookups on server names */
static bool avoid_dns = true;
static bool use_gssproxy = false;
-int thread_started = false;
-pthread_mutex_t pmutex = PTHREAD_MUTEX_INITIALIZER;
-pthread_cond_t pcond = PTHREAD_COND_INITIALIZER;
+pthread_mutex_t clp_lock = PTHREAD_MUTEX_INITIALIZER;
+static bool signal_received = false;
+static struct event_base *evbase = NULL;
TAILQ_HEAD(topdir_list_head, topdir) topdir_list;
@@ -359,20 +359,28 @@ out:
free(port);
}
+/* Actually frees clp and fields that might be used from other
+ * threads if was last reference.
+ */
static void
-gssd_destroy_client(struct clnt_info *clp)
+gssd_free_client(struct clnt_info *clp)
{
- if (clp->krb5_fd >= 0) {
+ int refcnt;
+
+ pthread_mutex_lock(&clp_lock);
+ refcnt = --clp->refcount;
+ pthread_mutex_unlock(&clp_lock);
+ if (refcnt > 0)
+ return;
+
+ printerr(3, "freeing client %s\n", clp->relpath);
+
+ if (clp->krb5_fd >= 0)
close(clp->krb5_fd);
- event_del(&clp->krb5_ev);
- }
- if (clp->gssd_fd >= 0) {
+ if (clp->gssd_fd >= 0)
close(clp->gssd_fd);
- event_del(&clp->gssd_ev);
- }
- inotify_rm_watch(inotify_fd, clp->wd);
free(clp->relpath);
free(clp->servicename);
free(clp->servername);
@@ -380,6 +388,30 @@ gssd_destroy_client(struct clnt_info *clp)
free(clp);
}
+/* Called when removing from clnt_list to tear down event handling.
+ * Will then free clp if was last reference.
+ */
+static void
+gssd_destroy_client(struct clnt_info *clp)
+{
+ printerr(3, "destroying client %s\n", clp->relpath);
+
+ if (clp->krb5_ev) {
+ event_del(clp->krb5_ev);
+ event_free(clp->krb5_ev);
+ clp->krb5_ev = NULL;
+ }
+
+ if (clp->gssd_ev) {
+ event_del(clp->gssd_ev);
+ event_free(clp->gssd_ev);
+ clp->gssd_ev = NULL;
+ }
+
+ inotify_rm_watch(inotify_fd, clp->wd);
+ gssd_free_client(clp);
+}
+
static void gssd_scan(void);
static int
@@ -416,11 +448,21 @@ static struct clnt_upcall_info *alloc_upcall_info(struct clnt_info *clp)
info = malloc(sizeof(struct clnt_upcall_info));
if (info == NULL)
return NULL;
+
+ pthread_mutex_lock(&clp_lock);
+ clp->refcount++;
+ pthread_mutex_unlock(&clp_lock);
info->clp = clp;
return info;
}
+void free_upcall_info(struct clnt_upcall_info *info)
+{
+ gssd_free_client(info->clp);
+ free(info);
+}
+
/* For each upcall read the upcall info into the buffer, then create a
* thread in a detached state so that resources are released back into
* the system without the need for a join.
@@ -438,13 +480,13 @@ gssd_clnt_gssd_cb(int UNUSED(fd), short UNUSED(which), void *data)
info->lbuflen = read(clp->gssd_fd, info->lbuf, sizeof(info->lbuf));
if (info->lbuflen <= 0 || info->lbuf[info->lbuflen-1] != '\n') {
printerr(0, "WARNING: %s: failed reading request\n", __func__);
- free(info);
+ free_upcall_info(info);
return;
}
info->lbuf[info->lbuflen-1] = 0;
if (start_upcall_thread(handle_gssd_upcall, info))
- free(info);
+ free_upcall_info(info);
}
static void
@@ -461,12 +503,12 @@ gssd_clnt_krb5_cb(int UNUSED(fd), short UNUSED(which), void *data)
sizeof(info->uid)) < (ssize_t)sizeof(info->uid)) {
printerr(0, "WARNING: %s: failed reading uid from krb5 "
"upcall pipe: %s\n", __func__, strerror(errno));
- free(info);
+ free_upcall_info(info);
return;
}
if (start_upcall_thread(handle_krb5_upcall, info))
- free(info);
+ free_upcall_info(info);
}
static struct clnt_info *
@@ -501,6 +543,7 @@ gssd_get_clnt(struct topdir *tdi, const char *name)
clp->name = clp->relpath + strlen(tdi->name) + 1;
clp->krb5_fd = -1;
clp->gssd_fd = -1;
+ clp->refcount = 1;
TAILQ_INSERT_HEAD(&tdi->clnt_list, clp, list);
return clp;
@@ -535,15 +578,15 @@ gssd_scan_clnt(struct clnt_info *clp)
clp->krb5_fd = openat(clntfd, "krb5", O_RDWR | O_NONBLOCK);
if (gssd_was_closed && clp->gssd_fd >= 0) {
- event_set(&clp->gssd_ev, clp->gssd_fd, EV_READ | EV_PERSIST,
- gssd_clnt_gssd_cb, clp);
- event_add(&clp->gssd_ev, NULL);
+ clp->gssd_ev = event_new(evbase, clp->gssd_fd, EV_READ | EV_PERSIST,
+ gssd_clnt_gssd_cb, clp);
+ event_add(clp->gssd_ev, NULL);
}
if (krb5_was_closed && clp->krb5_fd >= 0) {
- event_set(&clp->krb5_ev, clp->krb5_fd, EV_READ | EV_PERSIST,
- gssd_clnt_krb5_cb, clp);
- event_add(&clp->krb5_ev, NULL);
+ clp->krb5_ev = event_new(evbase, clp->krb5_fd, EV_READ | EV_PERSIST,
+ gssd_clnt_krb5_cb, clp);
+ event_add(clp->krb5_ev, NULL);
}
if (clp->krb5_fd == -1 && clp->gssd_fd == -1)
@@ -649,7 +692,7 @@ gssd_scan_topdir(const char *name)
if (clp->scanned)
continue;
- printerr(3, "destroying client %s\n", clp->relpath);
+ printerr(3, "orphaned client %s\n", clp->relpath);
saveprev = clp->list.tqe_prev;
TAILQ_REMOVE(&tdi->clnt_list, clp, list);
gssd_destroy_client(clp);
@@ -746,12 +789,16 @@ gssd_inotify_clnt(struct topdir *tdi, struct clnt_info *clp, const struct inotif
} else if (ev->mask & IN_DELETE) {
if (!strcmp(ev->name, "gssd") && clp->gssd_fd >= 0) {
close(clp->gssd_fd);
- event_del(&clp->gssd_ev);
+ event_del(clp->gssd_ev);
+ event_free(clp->gssd_ev);
+ clp->gssd_ev = NULL;
clp->gssd_fd = -1;
} else if (!strcmp(ev->name, "krb5") && clp->krb5_fd >= 0) {
close(clp->krb5_fd);
- event_del(&clp->krb5_ev);
+ event_del(clp->krb5_ev);
+ event_free(clp->krb5_ev);
+ clp->krb5_ev = NULL;
clp->krb5_fd = -1;
}
@@ -824,10 +871,15 @@ found:
static void
sig_die(int signal)
{
- if (root_uses_machine_creds)
- gssd_destroy_krb5_machine_creds();
+ if (signal_received) {
+ gssd_destroy_krb5_principals(root_uses_machine_creds);
+ printerr(1, "forced exiting on signal %d\n", signal);
+ exit(0);
+ }
+
+ signal_received = true;
printerr(1, "exiting on signal %d\n", signal);
- exit(0);
+ event_base_loopexit(evbase, NULL);
}
static void
@@ -884,9 +936,10 @@ main(int argc, char *argv[])
int rpc_verbosity = 0;
int opt;
int i;
+ int rc;
extern char *optarg;
char *progname;
- struct event sighup_ev;
+ struct event *sighup_ev;
read_gss_conf();
@@ -1025,7 +1078,11 @@ main(int argc, char *argv[])
if (gssd_check_mechs() != 0)
errx(1, "Problem with gssapi library");
- event_init();
+ evbase = event_base_new();
+ if (!evbase) {
+ printerr(0, "ERROR: failed to create event base\n");
+ exit(EXIT_FAILURE);
+ }
pipefs_dir = opendir(pipefs_path);
if (!pipefs_dir) {
@@ -1047,18 +1104,43 @@ main(int argc, char *argv[])
signal(SIGINT, sig_die);
signal(SIGTERM, sig_die);
- signal_set(&sighup_ev, SIGHUP, gssd_scan_cb, NULL);
- signal_add(&sighup_ev, NULL);
- event_set(&inotify_ev, inotify_fd, EV_READ | EV_PERSIST, gssd_inotify_cb, NULL);
- event_add(&inotify_ev, NULL);
+ sighup_ev = evsignal_new(evbase, SIGHUP, gssd_scan_cb, NULL);
+ evsignal_add(sighup_ev, NULL);
+ inotify_ev = event_new(evbase, inotify_fd, EV_READ | EV_PERSIST,
+ gssd_inotify_cb, NULL);
+ event_add(inotify_ev, NULL);
TAILQ_INIT(&topdir_list);
gssd_scan();
daemon_ready();
- event_dispatch();
+ rc = event_base_dispatch(evbase);
- printerr(0, "ERROR: event_dispatch() returned!\n");
- return EXIT_FAILURE;
-}
+ printerr(0, "event_dispatch() returned %i!\n", rc);
+
+ gssd_destroy_krb5_principals(root_uses_machine_creds);
+
+ while (!TAILQ_EMPTY(&topdir_list)) {
+ struct topdir *tdi = TAILQ_FIRST(&topdir_list);
+ TAILQ_REMOVE(&topdir_list, tdi, list);
+ while (!TAILQ_EMPTY(&tdi->clnt_list)) {
+ struct clnt_info *clp = TAILQ_FIRST(&tdi->clnt_list);
+ TAILQ_REMOVE(&tdi->clnt_list, clp, list);
+ gssd_destroy_client(clp);
+ }
+ free(tdi);
+ }
+
+ event_free(inotify_ev);
+ event_free(sighup_ev);
+ event_base_free(evbase);
+
+ close(inotify_fd);
+ close(pipefs_fd);
+ closedir(pipefs_dir);
+ free(preferred_realm);
+ free(ccachesearch);
+
+ return rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
diff --git a/utils/gssd/gssd.h b/utils/gssd/gssd.h
index f4f59754..1e8c58d4 100644
--- a/utils/gssd/gssd.h
+++ b/utils/gssd/gssd.h
@@ -62,13 +62,10 @@ extern int root_uses_machine_creds;
extern unsigned int context_timeout;
extern unsigned int rpc_timeout;
extern char *preferred_realm;
-extern pthread_mutex_t ple_lock;
-extern pthread_cond_t pcond;
-extern pthread_mutex_t pmutex;
-extern int thread_started;
struct clnt_info {
TAILQ_ENTRY(clnt_info) list;
+ int refcount;
int wd;
bool scanned;
char *name;
@@ -79,9 +76,9 @@ struct clnt_info {
int vers;
char *protocol;
int krb5_fd;
- struct event krb5_ev;
+ struct event *krb5_ev;
int gssd_fd;
- struct event gssd_ev;
+ struct event *gssd_ev;
struct sockaddr_storage addr;
};
@@ -94,6 +91,7 @@ struct clnt_upcall_info {
void handle_krb5_upcall(struct clnt_upcall_info *clp);
void handle_gssd_upcall(struct clnt_upcall_info *clp);
+void free_upcall_info(struct clnt_upcall_info *info);
#endif /* _RPC_GSSD_H_ */
diff --git a/utils/gssd/gssd_proc.c b/utils/gssd/gssd_proc.c
index bfcf3f09..ae3ebe81 100644
--- a/utils/gssd/gssd_proc.c
+++ b/utils/gssd/gssd_proc.c
@@ -149,9 +149,10 @@ do_downcall(int k5_fd, uid_t uid, struct authgss_private_data *pd,
char *buf = NULL, *p = NULL, *end = NULL;
unsigned int timeout = context_timeout;
unsigned int buf_size = 0;
+ pthread_t tid = pthread_self();
- printerr(2, "doing downcall: lifetime_rec=%u acceptor=%.*s\n",
- lifetime_rec, acceptor->length, acceptor->value);
+ printerr(2, "do_downcall(0x%x): lifetime_rec=%u acceptor=%.*s\n",
+ tid, lifetime_rec, acceptor->length, acceptor->value);
buf_size = sizeof(uid) + sizeof(timeout) + sizeof(pd->pd_seq_win) +
sizeof(pd->pd_ctx_hndl.length) + pd->pd_ctx_hndl.length +
sizeof(context_token->length) + context_token->length +
@@ -177,7 +178,7 @@ do_downcall(int k5_fd, uid_t uid, struct authgss_private_data *pd,
return;
out_err:
free(buf);
- printerr(1, "Failed to write downcall!\n");
+ printerr(1, "do_downcall(0x%x): Failed to write downcall!\n", tid);
return;
}
@@ -231,7 +232,7 @@ populate_port(struct sockaddr *sa, const socklen_t salen,
switch (sa->sa_family) {
case AF_INET:
if (s4->sin_port != 0) {
- printerr(2, "DEBUG: port already set to %d\n",
+ printerr(4, "DEBUG: port already set to %d\n",
ntohs(s4->sin_port));
return 1;
}
@@ -239,7 +240,7 @@ populate_port(struct sockaddr *sa, const socklen_t salen,
#ifdef IPV6_SUPPORTED
case AF_INET6:
if (s6->sin6_port != 0) {
- printerr(2, "DEBUG: port already set to %d\n",
+ printerr(4, "DEBUG: port already set to %d\n",
ntohs(s6->sin6_port));
return 1;
}
@@ -544,7 +545,7 @@ krb5_use_machine_creds(struct clnt_info *clp, uid_t uid,
uid, tgtname);
do {
- gssd_refresh_krb5_machine_credential(clp->servername, NULL,
+ gssd_refresh_krb5_machine_credential(clp->servername,
service, srchost);
/*
* Get a list of credential cache names and try each
@@ -726,7 +727,7 @@ handle_krb5_upcall(struct clnt_upcall_info *info)
printerr(2, "\n%s: uid %d (%s)\n", __func__, info->uid, clp->relpath);
process_krb5_upcall(clp, info->uid, clp->krb5_fd, NULL, NULL, NULL);
- free(info);
+ free_upcall_info(info);
}
void
@@ -743,8 +744,10 @@ handle_gssd_upcall(struct clnt_upcall_info *info)
char *enctypes = NULL;
char *upcall_str;
char *pbuf = info->lbuf;
+ pthread_t tid = pthread_self();
- printerr(2, "%s: '%s' (%s)\n", __func__, info->lbuf, clp->relpath);
+ printerr(2, "\n%s(0x%x): '%s' (%s)\n", __func__, tid,
+ info->lbuf, clp->relpath);
upcall_str = strdup(info->lbuf);
if (upcall_str == NULL) {
@@ -826,6 +829,6 @@ handle_gssd_upcall(struct clnt_upcall_info *info)
out:
free(upcall_str);
out_nomem:
- free(info);
+ free_upcall_info(info);
return;
}
diff --git a/utils/gssd/krb5_util.c b/utils/gssd/krb5_util.c
index 26e51edf..d675c3a4 100644
--- a/utils/gssd/krb5_util.c
+++ b/utils/gssd/krb5_util.c
@@ -126,9 +126,28 @@
#include "gss_util.h"
#include "krb5_util.h"
+/*
+ * List of principals from our keytab that we
+ * will try to use to obtain credentials
+ * (known as a principal list entry (ple))
+ */
+struct gssd_k5_kt_princ {
+ struct gssd_k5_kt_princ *next;
+ // Only protect against deletion, not modification
+ int refcount;
+ // Only set during creation in new_ple()
+ krb5_principal princ;
+ char *realm;
+ // Modified during usage by gssd_get_single_krb5_cred()
+ char *ccname;
+ krb5_timestamp endtime;
+};
+
+
/* Global list of principals/cache file names for machine credentials */
-struct gssd_k5_kt_princ *gssd_k5_kt_princ_list = NULL;
-pthread_mutex_t ple_lock = PTHREAD_MUTEX_INITIALIZER;
+static struct gssd_k5_kt_princ *gssd_k5_kt_princ_list = NULL;
+/* This mutex protects list modification & ple->ccname */
+static pthread_mutex_t ple_lock = PTHREAD_MUTEX_INITIALIZER;
#ifdef HAVE_SET_ALLOWABLE_ENCTYPES
int limit_to_legacy_enctypes = 0;
@@ -146,6 +165,18 @@ static int gssd_get_single_krb5_cred(krb5_context context,
static int query_krb5_ccache(const char* cred_cache, char **ret_princname,
char **ret_realm);
+static void release_ple(krb5_context context, struct gssd_k5_kt_princ *ple)
+{
+ if (--ple->refcount)
+ return;
+
+ printerr(3, "freeing cached principal (ccname=%s, realm=%s)\n", ple->ccname, ple->realm);
+ krb5_free_principal(context, ple->princ);
+ free(ple->ccname);
+ free(ple->realm);
+ free(ple);
+}
+
/*
* Called from the scandir function to weed out potential krb5
* credentials cache files
@@ -352,12 +383,15 @@ gssd_get_single_krb5_cred(krb5_context context,
* 300 because clock skew must be within 300sec for kerberos
*/
now += 300;
+ pthread_mutex_lock(&ple_lock);
if (ple->ccname && ple->endtime > now && !nocache) {
printerr(3, "INFO: Credentials in CC '%s' are good until %d\n",
ple->ccname, ple->endtime);
code = 0;
+ pthread_mutex_unlock(&ple_lock);
goto out;
}
+ pthread_mutex_unlock(&ple_lock);
if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
printerr(0, "ERROR: Unable to get keytab name in "
@@ -410,6 +444,7 @@ gssd_get_single_krb5_cred(krb5_context context,
* Initialize cache file which we're going to be using
*/
+ pthread_mutex_lock(&ple_lock);
if (use_memcache)
cache_type = "MEMORY";
else
@@ -419,15 +454,18 @@ gssd_get_single_krb5_cred(krb5_context context,
ccachesearch[0], GSSD_DEFAULT_CRED_PREFIX,
GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
ple->endtime = my_creds.times.endtime;
- if (ple->ccname != NULL)
+ if (ple->ccname == NULL || strcmp(ple->ccname, cc_name) != 0) {
free(ple->ccname);
- ple->ccname = strdup(cc_name);
- if (ple->ccname == NULL) {
- printerr(0, "ERROR: no storage to duplicate credentials "
- "cache name '%s'\n", cc_name);
- code = ENOMEM;
- goto out;
+ ple->ccname = strdup(cc_name);
+ if (ple->ccname == NULL) {
+ printerr(0, "ERROR: no storage to duplicate credentials "
+ "cache name '%s'\n", cc_name);
+ code = ENOMEM;
+ pthread_mutex_unlock(&ple_lock);
+ goto out;
+ }
}
+ pthread_mutex_unlock(&ple_lock);
if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
k5err = gssd_k5_err_msg(context, code);
printerr(0, "ERROR: %s while opening credential cache '%s'\n",
@@ -465,6 +503,7 @@ gssd_get_single_krb5_cred(krb5_context context,
/*
* Given a principal, find a matching ple structure
+ * Called with mutex held
*/
static struct gssd_k5_kt_princ *
find_ple_by_princ(krb5_context context, krb5_principal princ)
@@ -481,6 +520,7 @@ find_ple_by_princ(krb5_context context, krb5_principal princ)
/*
* Create, initialize, and add a new ple structure to the global list
+ * Called with mutex held
*/
static struct gssd_k5_kt_princ *
new_ple(krb5_context context, krb5_principal princ)
@@ -532,6 +572,7 @@ new_ple(krb5_context context, krb5_principal princ)
p->next = ple;
}
+ ple->refcount = 1;
return ple;
outerr:
if (ple) {
@@ -550,13 +591,14 @@ get_ple_by_princ(krb5_context context, krb5_principal princ)
{
struct gssd_k5_kt_princ *ple;
- /* Need to serialize list if we ever become multi-threaded! */
-
pthread_mutex_lock(&ple_lock);
ple = find_ple_by_princ(context, princ);
if (ple == NULL) {
ple = new_ple(context, princ);
}
+ if (ple != NULL) {
+ ple->refcount++;
+ }
pthread_mutex_unlock(&ple_lock);
return ple;
@@ -721,6 +763,8 @@ gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
retval = ENOMEM;
k5_free_kt_entry(context, kte);
} else {
+ release_ple(context, ple);
+ ple = NULL;
retval = 0;
*found = 1;
}
@@ -796,12 +840,12 @@ find_keytab_entry(krb5_context context, krb5_keytab kt,
/* Compute the active directory machine name HOST$ */
krb5_appdefault_string(context, "nfs", NULL, "ad_principal_name",
notsetstr, &adhostoverride);
- if (strcmp(adhostoverride, notsetstr) != 0) {
- printerr (1,
- "AD host string overridden with \"%s\" from appdefaults\n",
- adhostoverride);
- /* No overflow: Windows cannot handle strings longer than 19 chars */
- strcpy(myhostad, adhostoverride);
+ if (adhostoverride && strcmp(adhostoverride, notsetstr) != 0) {
+ printerr(1,
+ "AD host string overridden with \"%s\" from appdefaults\n",
+ adhostoverride);
+ /* No overflow: Windows cannot handle strings longer than 19 chars */
+ strcpy(myhostad, adhostoverride);
} else {
strcpy(myhostad, myhostname);
for (i = 0; myhostad[i] != 0; ++i) {
@@ -928,7 +972,7 @@ find_keytab_entry(krb5_context context, krb5_keytab kt,
tried_upper = 1;
}
} else {
- printerr(3, "Success getting keytab entry for '%s'\n",spn);
+ printerr(2, "Success getting keytab entry for '%s'\n",spn);
retval = 0;
goto out;
}
@@ -1053,6 +1097,93 @@ err_cache:
return (*ret_princname && *ret_realm);
}
+/*
+ * Obtain (or refresh if necessary) Kerberos machine credentials
+ * If a ple is passed in, it's reference will be released
+ */
+static int
+gssd_refresh_krb5_machine_credential_internal(char *hostname,
+ struct gssd_k5_kt_princ *ple,
+ char *service, char *srchost)
+{
+ krb5_error_code code = 0;
+ krb5_context context;
+ krb5_keytab kt = NULL;;
+ int retval = 0;
+ char *k5err = NULL;
+ const char *svcnames[] = { "$", "root", "nfs", "host", NULL };
+
+ printerr(2, "%s: hostname=%s ple=%p service=%s srchost=%s\n",
+ __func__, hostname, ple, service, srchost);
+
+ /*
+ * If a specific service name was specified, use it.
+ * Otherwise, use the default list.
+ */
+ if (service != NULL && strcmp(service, "*") != 0) {
+ svcnames[0] = service;
+ svcnames[1] = NULL;
+ }
+ if (hostname == NULL && ple == NULL)
+ return EINVAL;
+
+ code = krb5_init_context(&context);
+ if (code) {
+ k5err = gssd_k5_err_msg(NULL, code);
+ printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
+ __func__, k5err);
+ retval = code;
+ goto out;
+ }
+
+ if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
+ k5err = gssd_k5_err_msg(context, code);
+ printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
+ __func__, k5err, keytabfile);
+ goto out_free_context;
+ }
+
+ if (ple == NULL) {
+ krb5_keytab_entry kte;
+
+ code = find_keytab_entry(context, kt, srchost, hostname,
+ &kte, svcnames);
+ if (code) {
+ printerr(0, "ERROR: %s: no usable keytab entry found "
+ "in keytab %s for connection with host %s\n",
+ __FUNCTION__, keytabfile, hostname);
+ retval = code;
+ goto out_free_kt;
+ }
+
+ ple = get_ple_by_princ(context, kte.principal);
+ k5_free_kt_entry(context, &kte);
+ if (ple == NULL) {
+ char *pname;
+ if ((krb5_unparse_name(context, kte.principal, &pname))) {
+ pname = NULL;
+ }
+ printerr(0, "ERROR: %s: Could not locate or create "
+ "ple struct for principal %s for connection "
+ "with host %s\n",
+ __FUNCTION__, pname ? pname : "<unparsable>",
+ hostname);
+ if (pname) k5_free_unparsed_name(context, pname);
+ goto out_free_kt;
+ }
+ }
+ retval = gssd_get_single_krb5_cred(context, kt, ple, 0);
+out_free_kt:
+ krb5_kt_close(context, kt);
+out_free_context:
+ if (ple)
+ release_ple(context, ple);
+ krb5_free_context(context);
+out:
+ free(k5err);
+ return retval;
+}
+
/*==========================*/
/*=== External routines ===*/
/*==========================*/
@@ -1146,37 +1277,56 @@ gssd_get_krb5_machine_cred_list(char ***list)
goto out;
}
- /* Need to serialize list if we ever become multi-threaded! */
-
+ pthread_mutex_lock(&ple_lock);
for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
- if (ple->ccname) {
- /* Make sure cred is up-to-date before returning it */
- retval = gssd_refresh_krb5_machine_credential(NULL, ple,
- NULL, NULL);
- if (retval)
- continue;
- if (i + 1 > listsize) {
- listsize += listinc;
- l = (char **)
- realloc(l, listsize * sizeof(char *));
- if (l == NULL) {
- retval = ENOMEM;
- goto out;
- }
- }
- if ((l[i++] = strdup(ple->ccname)) == NULL) {
+ if (!ple->ccname)
+ continue;
+
+ /* Take advantage of the fact we only remove the ple
+ * from the list during shutdown. If it's modified
+ * concurrently at worst we'll just miss a new entry
+ * before the current ple
+ *
+ * gssd_refresh_krb5_machine_credential_internal() will
+ * release the ple refcount
+ */
+ ple->refcount++;
+ pthread_mutex_unlock(&ple_lock);
+ /* Make sure cred is up-to-date before returning it */
+ retval = gssd_refresh_krb5_machine_credential_internal(NULL, ple,
+ NULL, NULL);
+ pthread_mutex_lock(&ple_lock);
+ if (gssd_k5_kt_princ_list == NULL) {
+ /* Looks like we did shutdown... abort */
+ l[i] = NULL;
+ gssd_free_krb5_machine_cred_list(l);
+ retval = ENOMEM;
+ goto out_lock;
+ }
+ if (retval)
+ continue;
+ if (i + 1 > listsize) {
+ listsize += listinc;
+ l = (char **)
+ realloc(l, listsize * sizeof(char *));
+ if (l == NULL) {
retval = ENOMEM;
- goto out;
+ goto out_lock;
}
}
+ if ((l[i++] = strdup(ple->ccname)) == NULL) {
+ retval = ENOMEM;
+ goto out_lock;
+ }
}
if (i > 0) {
l[i] = NULL;
*list = l;
retval = 0;
- goto out;
} else
free((void *)l);
+out_lock:
+ pthread_mutex_unlock(&ple_lock);
out:
return retval;
}
@@ -1201,7 +1351,7 @@ gssd_free_krb5_machine_cred_list(char **list)
* Called upon exit. Destroys machine credentials.
*/
void
-gssd_destroy_krb5_machine_creds(void)
+gssd_destroy_krb5_principals(int destroy_machine_creds)
{
krb5_context context;
krb5_error_code code = 0;
@@ -1213,33 +1363,38 @@ gssd_destroy_krb5_machine_creds(void)
if (code) {
k5err = gssd_k5_err_msg(NULL, code);
printerr(0, "ERROR: %s while initializing krb5\n", k5err);
- goto out;
+ free(k5err);
+ return;
}
- for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
- if (!ple->ccname)
- continue;
- if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
- k5err = gssd_k5_err_msg(context, code);
- printerr(0, "WARNING: %s while resolving credential "
- "cache '%s' for destruction\n", k5err,
- ple->ccname);
- krb5_free_string(context, k5err);
- k5err = NULL;
- continue;
- }
+ pthread_mutex_lock(&ple_lock);
+ while (gssd_k5_kt_princ_list) {
+ ple = gssd_k5_kt_princ_list;
+ gssd_k5_kt_princ_list = ple->next;
- if ((code = krb5_cc_destroy(context, ccache))) {
- k5err = gssd_k5_err_msg(context, code);
- printerr(0, "WARNING: %s while destroying credential "
- "cache '%s'\n", k5err, ple->ccname);
- krb5_free_string(context, k5err);
- k5err = NULL;
+ if (destroy_machine_creds && ple->ccname) {
+ if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
+ k5err = gssd_k5_err_msg(context, code);
+ printerr(0, "WARNING: %s while resolving credential "
+ "cache '%s' for destruction\n", k5err,
+ ple->ccname);
+ free(k5err);
+ k5err = NULL;
+ }
+
+ if (!code && (code = krb5_cc_destroy(context, ccache))) {
+ k5err = gssd_k5_err_msg(context, code);
+ printerr(0, "WARNING: %s while destroying credential "
+ "cache '%s'\n", k5err, ple->ccname);
+ free(k5err);
+ k5err = NULL;
+ }
}
+
+ release_ple(context, ple);
}
+ pthread_mutex_unlock(&ple_lock);
krb5_free_context(context);
- out:
- krb5_free_string(context, k5err);
}
/*
@@ -1247,83 +1402,10 @@ gssd_destroy_krb5_machine_creds(void)
*/
int
gssd_refresh_krb5_machine_credential(char *hostname,
- struct gssd_k5_kt_princ *ple,
char *service, char *srchost)
{
- krb5_error_code code = 0;
- krb5_context context;
- krb5_keytab kt = NULL;;
- int retval = 0;
- char *k5err = NULL;
- const char *svcnames[] = { "$", "root", "nfs", "host", NULL };
-
- printerr(2, "%s: hostname=%s ple=%p service=%s srchost=%s\n",
- __func__, hostname, ple, service, srchost);
-
- /*
- * If a specific service name was specified, use it.
- * Otherwise, use the default list.
- */
- if (service != NULL && strcmp(service, "*") != 0) {
- svcnames[0] = service;
- svcnames[1] = NULL;
- }
- if (hostname == NULL && ple == NULL)
- return EINVAL;
-
- code = krb5_init_context(&context);
- if (code) {
- k5err = gssd_k5_err_msg(NULL, code);
- printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
- __func__, k5err);
- retval = code;
- goto out;
- }
-
- if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
- k5err = gssd_k5_err_msg(context, code);
- printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
- __func__, k5err, keytabfile);
- goto out_free_context;
- }
-
- if (ple == NULL) {
- krb5_keytab_entry kte;
-
- code = find_keytab_entry(context, kt, srchost, hostname,
- &kte, svcnames);
- if (code) {
- printerr(0, "ERROR: %s: no usable keytab entry found "
- "in keytab %s for connection with host %s\n",
- __FUNCTION__, keytabfile, hostname);
- retval = code;
- goto out_free_kt;
- }
-
- ple = get_ple_by_princ(context, kte.principal);
- k5_free_kt_entry(context, &kte);
- if (ple == NULL) {
- char *pname;
- if ((krb5_unparse_name(context, kte.principal, &pname))) {
- pname = NULL;
- }
- printerr(0, "ERROR: %s: Could not locate or create "
- "ple struct for principal %s for connection "
- "with host %s\n",
- __FUNCTION__, pname ? pname : "<unparsable>",
- hostname);
- if (pname) k5_free_unparsed_name(context, pname);
- goto out_free_kt;
- }
- }
- retval = gssd_get_single_krb5_cred(context, kt, ple, 0);
-out_free_kt:
- krb5_kt_close(context, kt);
-out_free_context:
- krb5_free_context(context);
-out:
- krb5_free_string(context, k5err);
- return retval;
+ return gssd_refresh_krb5_machine_credential_internal(hostname, NULL,
+ service, srchost);
}
/*
diff --git a/utils/gssd/krb5_util.h b/utils/gssd/krb5_util.h
index b000b444..2415205a 100644
--- a/utils/gssd/krb5_util.h
+++ b/utils/gssd/krb5_util.h
@@ -9,27 +9,13 @@
#include "gss_oids.h"
#endif
-/*
- * List of principals from our keytab that we
- * will try to use to obtain credentials
- * (known as a principal list entry (ple))
- */
-struct gssd_k5_kt_princ {
- struct gssd_k5_kt_princ *next;
- krb5_principal princ;
- char *ccname;
- char *realm;
- krb5_timestamp endtime;
-};
-
int gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername,
char *dirname);
int gssd_get_krb5_machine_cred_list(char ***list);
void gssd_free_krb5_machine_cred_list(char **list);
-void gssd_destroy_krb5_machine_creds(void);
+void gssd_destroy_krb5_principals(int destroy_machine_creds);
int gssd_refresh_krb5_machine_credential(char *hostname,
- struct gssd_k5_kt_princ *ple,
char *service, char *srchost);
char *gssd_k5_err_msg(krb5_context context, krb5_error_code code);
void gssd_k5_get_default_realm(char **def_realm);
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