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-rw-r--r--utils/gssd/svcgssd.c348
1 files changed, 348 insertions, 0 deletions
diff --git a/utils/gssd/svcgssd.c b/utils/gssd/svcgssd.c
new file mode 100644
index 0000000..ce78d8f
--- /dev/null
+++ b/utils/gssd/svcgssd.c
@@ -0,0 +1,348 @@
+/*
+ gssd.c
+
+ Copyright (c) 2000 The Regents of the University of Michigan.
+ All rights reserved.
+
+ Copyright (c) 2000 Dug Song <dugsong@UMICH.EDU>.
+ Copyright (c) 2002 Andy Adamson <andros@UMICH.EDU>.
+ Copyright (c) 2002 Marius Aamodt Eriksen <marius@UMICH.EDU>.
+ Copyright (c) 2002 J. Bruce Fields <bfields@UMICH.EDU>.
+ All rights reserved, all wrongs reversed.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ 3. Neither the name of the University nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <rpc/rpc.h>
+#include <fcntl.h>
+#include <errno.h>
+
+
+#include <unistd.h>
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <nfsidmap.h>
+#include <event2/event.h>
+
+#include "nfslib.h"
+#include "svcgssd.h"
+#include "gss_util.h"
+#include "err_util.h"
+#include "conffile.h"
+#include "misc.h"
+#include "svcgssd_krb5.h"
+
+static bool signal_received = false;
+static struct event_base *evbase = NULL;
+static int nullrpc_fd = -1;
+static struct event *nullrpc_event = NULL;
+static struct event *wait_event = NULL;
+
+#define NULLRPC_FILE "/proc/net/rpc/auth.rpcsec.init/channel"
+
+static void
+sig_die(int signal)
+{
+ if (signal_received) {
+ /* destroy krb5 machine creds */
+ printerr(1, "forced exiting on signal %d\n", signal);
+ exit(0);
+ }
+ signal_received = true;
+ printerr(1, "exiting on signal %d\n", signal);
+ event_base_loopexit(evbase, NULL);
+}
+
+static void
+sig_hup(int signal)
+{
+ /* don't exit on SIGHUP */
+ printerr(1, "Received SIGHUP(%d)... Ignoring.\n", signal);
+ return;
+}
+
+static void
+usage(char *progname)
+{
+ fprintf(stderr, "usage: %s [-n] [-f] [-v] [-r] [-i] [-p principal]\n",
+ progname);
+ exit(1);
+}
+
+static void
+svcgssd_nullrpc_cb(int fd, short UNUSED(which), void *UNUSED(data))
+{
+ char lbuf[RPC_CHAN_BUF_SIZE];
+ int lbuflen = 0;
+
+ printerr(1, "reading null request\n");
+
+ lbuflen = read(fd, lbuf, sizeof(lbuf));
+ if (lbuflen <= 0 || lbuf[lbuflen-1] != '\n') {
+ printerr(0, "WARNING: handle_nullreq: failed reading request\n");
+ return;
+ }
+ lbuf[lbuflen-1] = 0;
+
+ handle_nullreq(lbuf);
+}
+
+static void
+svcgssd_nullrpc_close(void)
+{
+ if (nullrpc_event) {
+ printerr(2, "closing nullrpc channel %s\n", NULLRPC_FILE);
+ event_free(nullrpc_event);
+ nullrpc_event = NULL;
+ }
+ if (nullrpc_fd != -1) {
+ close(nullrpc_fd);
+ nullrpc_fd = -1;
+ }
+}
+
+static void
+svcgssd_nullrpc_open(void)
+{
+ nullrpc_fd = open(NULLRPC_FILE, O_RDWR);
+ if (nullrpc_fd < 0) {
+ printerr(0, "failed to open %s: %s\n",
+ NULLRPC_FILE, strerror(errno));
+ return;
+ }
+ nullrpc_event = event_new(evbase, nullrpc_fd, EV_READ | EV_PERSIST,
+ svcgssd_nullrpc_cb, NULL);
+ if (!nullrpc_event) {
+ printerr(0, "failed to create event for %s: %s\n",
+ NULLRPC_FILE, strerror(errno));
+ close(nullrpc_fd);
+ nullrpc_fd = -1;
+ return;
+ }
+ event_add(nullrpc_event, NULL);
+ printerr(2, "opened nullrpc channel %s\n", NULLRPC_FILE);
+}
+
+static void
+svcgssd_wait_cb(int UNUSED(fd), short UNUSED(which), void *UNUSED(data))
+{
+ static int times = 0;
+ int rc;
+
+ rc = access(NULLRPC_FILE, R_OK | W_OK);
+ if (rc != 0) {
+ struct timeval t = {times < 10 ? 1 : 10, 0};
+ times++;
+ if (times % 30 == 0)
+ printerr(2, "still waiting for nullrpc channel: %s\n",
+ NULLRPC_FILE);
+ evtimer_add(wait_event, &t);
+ return;
+ }
+
+ svcgssd_nullrpc_open();
+ event_free(wait_event);
+ wait_event = NULL;
+}
+
+
+
+int
+main(int argc, char *argv[])
+{
+ int get_creds = 1;
+ int fg = 0;
+ int verbosity = 0;
+ int rpc_verbosity = 0;
+ int idmap_verbosity = 0;
+ int opt, status;
+ extern char *optarg;
+ char *progname;
+ char *principal = NULL;
+ char *s;
+ int rc;
+
+ conf_init_file(NFS_CONFFILE);
+
+ s = conf_get_str("svcgssd", "principal");
+ if (!s)
+ ;
+ else if (strcmp(s, "system")== 0)
+ get_creds = 0;
+ else
+ principal = s;
+
+ verbosity = conf_get_num("svcgssd", "Verbosity", verbosity);
+ rpc_verbosity = conf_get_num("svcgssd", "RPC-Verbosity", rpc_verbosity);
+ idmap_verbosity = conf_get_num("svcgssd", "IDMAP-Verbosity", idmap_verbosity);
+
+ while ((opt = getopt(argc, argv, "fivrnp:")) != -1) {
+ switch (opt) {
+ case 'f':
+ fg = 1;
+ break;
+ case 'i':
+ idmap_verbosity++;
+ break;
+ case 'n':
+ get_creds = 0;
+ break;
+ case 'v':
+ verbosity++;
+ break;
+ case 'r':
+ rpc_verbosity++;
+ break;
+ case 'p':
+ principal = optarg;
+ break;
+ default:
+ usage(argv[0]);
+ break;
+ }
+ }
+
+ if ((progname = strrchr(argv[0], '/')))
+ progname++;
+ else
+ progname = argv[0];
+
+ initerr(progname, verbosity, fg);
+#ifdef HAVE_AUTHGSS_SET_DEBUG_LEVEL
+ if (verbosity && rpc_verbosity == 0)
+ rpc_verbosity = verbosity;
+ authgss_set_debug_level(rpc_verbosity);
+#elif HAVE_LIBTIRPC_SET_DEBUG
+ /*
+ * Only set the libtirpc debug level if explicitly requested via -r...
+ * svcgssd is chatty enough as it is.
+ */
+ if (rpc_verbosity > 0)
+ libtirpc_set_debug(progname, rpc_verbosity, fg);
+#else
+ if (rpc_verbosity > 0)
+ printerr(0, "Warning: rpcsec_gss library does not "
+ "support setting debug level\n");
+#endif
+#ifdef HAVE_NFS4_SET_DEBUG
+ if (verbosity && idmap_verbosity == 0)
+ idmap_verbosity = verbosity;
+ nfs4_set_debug(idmap_verbosity, NULL);
+#else
+ if (idmap_verbosity > 0)
+ printerr(0, "Warning: your nfsidmap library does not "
+ "support setting debug level\n");
+#endif
+
+ if (gssd_check_mechs() != 0) {
+ printerr(0, "ERROR: Problem with gssapi library\n");
+ exit(1);
+ }
+
+ daemon_init(fg);
+
+ evbase = event_base_new();
+ if (!evbase) {
+ printerr(0, "ERROR: failed to create event base: %s\n", strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+
+ signal(SIGINT, sig_die);
+ signal(SIGTERM, sig_die);
+ signal(SIGHUP, sig_hup);
+
+ if (get_creds) {
+ if (principal)
+ status = gssd_acquire_cred(principal,
+ ((const gss_OID)GSS_C_NT_USER_NAME));
+ else
+ status = gssd_acquire_cred(GSSD_SERVICE_NAME,
+ (const gss_OID)GSS_C_NT_HOSTBASED_SERVICE);
+ if (status == FALSE) {
+ printerr(0, "unable to obtain root (machine) credentials\n");
+ printerr(0, "do you have a keytab entry for %s in"
+ "/etc/krb5.keytab?\n",
+ principal ? principal : "nfs/<your.host>@<YOUR.REALM>");
+ exit(1);
+ }
+ } else {
+ status = gssd_acquire_cred(NULL,
+ (const gss_OID)GSS_C_NT_HOSTBASED_SERVICE);
+ if (status == FALSE) {
+ printerr(0, "unable to obtain nameless credentials\n");
+ exit(1);
+ }
+ }
+
+ svcgssd_nullrpc_open();
+ if (!nullrpc_event) {
+ struct timeval t = {1, 0};
+
+ printerr(2, "waiting for nullrpc channel to appear\n");
+ wait_event = evtimer_new(evbase, svcgssd_wait_cb, NULL);
+ if (!wait_event) {
+ printerr(0, "ERROR: failed to create wait event: %s\n",
+ strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+ evtimer_add(wait_event, &t);
+ }
+
+ daemon_ready();
+
+ /* We don't need the config anymore */
+ conf_cleanup();
+
+ nfs4_init_name_mapping(NULL); /* XXX: should only do this once */
+
+ rc = event_base_dispatch(evbase);
+ if (rc < 0)
+ printerr(0, "event_base_dispatch() returned %i!\n", rc);
+
+ svcgssd_nullrpc_close();
+ if (wait_event)
+ event_free(wait_event);
+
+ event_base_free(evbase);
+
+ nfs4_term_name_mapping();
+ svcgssd_free_enctypes();
+ gssd_cleanup();
+
+ return EXIT_SUCCESS;
+}
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