Hello,
we use a two-node cluster (pacemaker, corosync, drbd) as nfs-server.
We configured a virtual cluster-IP (using ocf::heartbeat:IPaddr2, iptables CLUSTERIP),
i.e. the nfs clients call the server as OurClusterIP.OurDomain.de while the real hostnames of the servers are
OurServer1.OurDomain.de and OurServer2.OurDomain.de.
If I tried to use the mount option krb5, svcgssd denied the mount with the message:
ERROR: GSS-API: error in handle_nullreq: gss_accept_sec_context(): Unspecified GSS failure. Minor code may provide more information - Wrong principal in request
I patched svcgssd that we can specify the principal to use as an option:
svcgssd -p nfs/OurClusterIP.OurDomain.de
Now, krb5 works fine!
I suggest to include that patch in the main line of nfs-utils to enable the use of krb5 with such virtual IP's.
The small patch is appended to the mail.
Best regards
Eberhard Kuemmerle
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Forschungszentrum Juelich GmbH
52425 Juelich
Sitz der Gesellschaft: Juelich
Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498
Vorsitzender des Aufsichtsrats: MinDirig Dr. Karl Eugen Huthmacher
Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender),
Dr. Ulrich Krafft (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt,
Prof. Dr. Sebastian M. Schmidt
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diff -rupN nfs-utils-1.2.1/utils/gssd/gssd.h nfs-utils-1.2.1_mod/utils/gssd/gssd.h
--- nfs-utils-1.2.1/utils/gssd/gssd.h 2009-11-04 12:13:56.000000000 +0100
+++ nfs-utils-1.2.1_mod/utils/gssd/gssd.h 2010-09-27 08:25:31.000000000 +0200
@@ -90,7 +90,6 @@ void init_client_list(void);
int update_client_list(void);
void handle_krb5_upcall(struct clnt_info *clp);
void handle_spkm3_upcall(struct clnt_info *clp);
-int gssd_acquire_cred(char *server_name);
void gssd_run(void);
diff -rupN nfs-utils-1.2.1/utils/gssd/gss_util.c nfs-utils-1.2.1_mod/utils/gssd/gss_util.c
--- nfs-utils-1.2.1/utils/gssd/gss_util.c 2009-11-04 12:13:56.000000000 +0100
+++ nfs-utils-1.2.1_mod/utils/gssd/gss_util.c 2010-09-27 08:14:47.000000000 +0200
@@ -191,7 +191,7 @@ pgsserr(char *msg, u_int32_t maj_stat, u
}
int
-gssd_acquire_cred(char *server_name)
+gssd_acquire_cred(char *server_name, const gss_OID oid)
{
gss_buffer_desc name;
gss_name_t target_name;
@@ -203,7 +203,7 @@ gssd_acquire_cred(char *server_name)
name.length = strlen(server_name);
maj_stat = gss_import_name(&min_stat, &name,
- (const gss_OID) GSS_C_NT_HOSTBASED_SERVICE,
+ oid,
&target_name);
if (maj_stat != GSS_S_COMPLETE) {
diff -rupN nfs-utils-1.2.1/utils/gssd/gss_util.h nfs-utils-1.2.1_mod/utils/gssd/gss_util.h
--- nfs-utils-1.2.1/utils/gssd/gss_util.h 2009-11-04 12:13:56.000000000 +0100
+++ nfs-utils-1.2.1_mod/utils/gssd/gss_util.h 2010-09-27 08:22:11.000000000 +0200
@@ -37,7 +37,7 @@
extern gss_cred_id_t gssd_creds;
-int gssd_acquire_cred(char *server_name);
+int gssd_acquire_cred(char *server_name, const gss_OID oid);
void pgsserr(char *msg, u_int32_t maj_stat, u_int32_t min_stat,
const gss_OID mech);
int gssd_check_mechs(void);
diff -rupN nfs-utils-1.2.1/utils/gssd/svcgssd.c nfs-utils-1.2.1_mod/utils/gssd/svcgssd.c
--- nfs-utils-1.2.1/utils/gssd/svcgssd.c 2009-11-04 12:13:56.000000000 +0100
+++ nfs-utils-1.2.1_mod/utils/gssd/svcgssd.c 2010-09-27 08:26:33.000000000 +0200
@@ -167,7 +167,7 @@ sig_hup(int signal)
static void
usage(char *progname)
{
- fprintf(stderr, "usage: %s [-n] [-f] [-v] [-r] [-i]\n",
+ fprintf(stderr, "usage: %s [-n] [-f] [-v] [-r] [-i] [-p principal]\n",
progname);
exit(1);
}
@@ -183,6 +183,7 @@ main(int argc, char *argv[])
int opt;
extern char *optarg;
char *progname;
+ char *principal = NULL;
while ((opt = getopt(argc, argv, "fivrnp:")) != -1) {
switch (opt) {
@@ -201,6 +202,9 @@ main(int argc, char *argv[])
case 'r':
rpc_verbosity++;
break;
+ case 'p':
+ principal = optarg;
+ break;
default:
usage(argv[0]);
break;
@@ -244,7 +248,9 @@ main(int argc, char *argv[])
signal(SIGTERM, sig_die);
signal(SIGHUP, sig_hup);
- if (get_creds && !gssd_acquire_cred(GSSD_SERVICE_NAME)) {
+ if (get_creds && !(principal
+ ? gssd_acquire_cred(principal, GSS_C_NT_USER_NAME)
+ : gssd_acquire_cred(GSSD_SERVICE_NAME, GSS_C_NT_HOSTBASED_SERVICE))) {
printerr(0, "unable to obtain root (machine) credentials\n");
printerr(0, "do you have a keytab entry for "
"nfs/<your.host>@<YOUR.REALM> in "
