Implement support for RPCSEC_GSS authentication to both the NFS client

and server. This replaces the RPC implementation of the NFS client and
server with the newer RPC implementation originally developed
(actually ported from the userland sunrpc code) to support the NFS
Lock Manager.  I have tested this code extensively and I believe it is
stable and that performance is at least equal to the legacy RPC
implementation.

The NFS code currently contains support for both the new RPC
implementation and the older legacy implementation inherited from the
original NFS codebase. The default is to use the new implementation -
add the NFS_LEGACYRPC option to fall back to the old code. When I
merge this support back to RELENG_7, I will probably change this so
that users have to 'opt in' to get the new code.

To use RPCSEC_GSS on either client or server, you must build a kernel
which includes the KGSSAPI option and the crypto device. On the
userland side, you must build at least a new libc, mountd, mount_nfs
and gssd. You must install new versions of /etc/rc.d/gssd and
/etc/rc.d/nfsd and add 'gssd_enable=YES' to /etc/rc.conf.

As long as gssd is running, you should be able to mount an NFS
filesystem from a server that requires RPCSEC_GSS authentication. The
mount itself can happen without any kerberos credentials but all
access to the filesystem will be denied unless the accessing user has
a valid ticket file in the standard place (/tmp/krb5cc_<uid>). There
is currently no support for situations where the ticket file is in a
different place, such as when the user logged in via SSH and has
delegated credentials from that login. This restriction is also
present in Solaris and Linux. In theory, we could improve this in
future, possibly using Brooks Davis' implementation of variant
symlinks.

Supporting RPCSEC_GSS on a server is nearly as simple. You must create
service creds for the server in the form 'nfs/<fqdn>@<REALM>' and
install them in /etc/krb5.keytab. The standard heimdal utility ktutil
makes this fairly easy. After the service creds have been created, you
can add a '-sec=krb5' option to /etc/exports and restart both mountd
and nfsd.

The only other difference an administrator should notice is that nfsd
doesn't fork to create service threads any more. In normal operation,
there will be two nfsd processes, one in userland waiting for TCP
connections and one in the kernel handling requests. The latter
process will create as many kthreads as required - these should be
visible via 'top -H'. The code has some support for varying the number
of service threads according to load but initially at least, nfsd uses
a fixed number of threads according to the value supplied to its '-n'
option.

Sponsored by:	Isilon Systems
MFC after:	1 month

4 files changed, 725 insertions, 0 deletions

diff --git a/tools/regression/kgssapi/Makefile b/tools/regression/kgssapi/Makefile
new file mode 100644
index 0000000..49059fa
--- /dev/null
+++ b/tools/regression/kgssapi/Makefile
@@ -0,0 +1,9 @@
+# $FreeBSD$
+
+PROG=	gsstest
+NO_MAN=
+WARNS?=	2
+LDADD=	-lgssapi -lgssapi_krb5
+DEBUG_FLAGS= -g -O0
+
+.include <bsd.prog.mk>
diff --git a/tools/regression/kgssapi/gsstest.c b/tools/regression/kgssapi/gsstest.c
new file mode 100644
index 0000000..acebf4c
--- /dev/null
+++ b/tools/regression/kgssapi/gsstest.c
@@ -0,0 +1,307 @@
+/*-
+ * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
+ * Authors: Doug Rabson <dfr@rabson.org>
+ * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <sys/module.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <err.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include <krb5.h>
+#include <gssapi/gssapi.h>
+#include <gssapi/gssapi_krb5.h>
+
+struct gsstest_2_args {
+	int step;		/* test step number */
+	gss_buffer_desc input_token; /* token from userland */
+	gss_buffer_desc output_token; /* buffer to receive reply token */
+};
+struct gsstest_2_res {
+	OM_uint32 maj_stat;	/* maj_stat from kernel */
+	OM_uint32 min_stat;	/* min_stat from kernel */
+	gss_buffer_desc output_token; /* reply token (using space from gsstest_2_args.output) */
+};
+
+static void
+report_error(gss_OID mech, OM_uint32 maj, OM_uint32 min)
+{
+	OM_uint32 maj_stat, min_stat;
+	OM_uint32 message_context;
+	gss_buffer_desc buf;
+
+	printf("major_stat=%d, minor_stat=%d\n", maj, min);
+	message_context = 0;
+	do {
+		maj_stat = gss_display_status(&min_stat, maj,
+		    GSS_C_GSS_CODE, GSS_C_NO_OID, &message_context, &buf);
+		printf("%.*s\n", (int)buf.length, (char *) buf.value);
+		gss_release_buffer(&min_stat, &buf);
+	} while (message_context);
+	if (mech) {
+		message_context = 0;
+		do {
+			maj_stat = gss_display_status(&min_stat, min,
+			    GSS_C_MECH_CODE, mech, &message_context, &buf);
+			printf("%.*s\n", (int)buf.length, (char *) buf.value);
+			gss_release_buffer(&min_stat, &buf);
+		} while (message_context);
+	}
+}
+
+int
+main(int argc, char **argv)
+{
+	struct module_stat stat;
+	int mod;
+	int syscall_num;
+
+	stat.version = sizeof(stat);
+	mod = modfind("gsstest_syscall");
+	if (mod < 0) {
+		fprintf(stderr, "%s: kernel support not present\n", argv[0]);
+		exit(1);
+	}
+	modstat(mod, &stat);
+	syscall_num = stat.data.intval;
+
+	switch (atoi(argv[1])) {
+	case 1:
+		syscall(syscall_num, 1, NULL, NULL);
+		break;
+
+	case 2: {
+		struct gsstest_2_args args;
+		struct gsstest_2_res res;
+		char hostname[512];
+		char token_buffer[8192];
+		OM_uint32 maj_stat, min_stat;
+		gss_ctx_id_t client_context = GSS_C_NO_CONTEXT;
+		gss_cred_id_t client_cred;
+		gss_OID mech_type = GSS_C_NO_OID;
+		gss_buffer_desc name_buf, message_buf;
+		gss_name_t name;
+		int32_t enctypes[] = {
+			ETYPE_DES_CBC_CRC,
+			ETYPE_ARCFOUR_HMAC_MD5,
+			ETYPE_ARCFOUR_HMAC_MD5_56,
+			ETYPE_AES256_CTS_HMAC_SHA1_96,
+			ETYPE_AES128_CTS_HMAC_SHA1_96,
+			ETYPE_DES3_CBC_SHA1,
+		};
+		int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
+		int established;
+		int i;
+
+		for (i = 0; i < num_enctypes; i++) {
+			printf("testing etype %d\n", enctypes[i]);
+			args.output_token.length = sizeof(token_buffer);
+			args.output_token.value = token_buffer;
+
+			gethostname(hostname, sizeof(hostname));
+			snprintf(token_buffer, sizeof(token_buffer),
+			    "nfs@%s", hostname);
+			name_buf.length = strlen(token_buffer);
+			name_buf.value = token_buffer;
+			maj_stat = gss_import_name(&min_stat, &name_buf,
+			    GSS_C_NT_HOSTBASED_SERVICE, &name);
+			if (GSS_ERROR(maj_stat)) {
+				printf("gss_import_name failed\n");
+				report_error(mech_type, maj_stat, min_stat);
+				goto out;
+			}
+
+			maj_stat = gss_acquire_cred(&min_stat, GSS_C_NO_NAME,
+			    0, GSS_C_NO_OID_SET, GSS_C_INITIATE, &client_cred,
+			    NULL, NULL);
+			if (GSS_ERROR(maj_stat)) {
+				printf("gss_acquire_cred (client) failed\n");
+				report_error(mech_type, maj_stat, min_stat);
+				goto out;
+			}
+
+			maj_stat = gss_krb5_set_allowable_enctypes(&min_stat,
+			    client_cred, 1, &enctypes[i]);
+			if (GSS_ERROR(maj_stat)) {
+				printf("gss_krb5_set_allowable_enctypes failed\n");
+				report_error(mech_type, maj_stat, min_stat);
+				goto out;
+			}
+
+			res.output_token.length = 0;
+			res.output_token.value = 0;
+			established = 0;
+			while (!established) {
+				maj_stat = gss_init_sec_context(&min_stat,
+				    client_cred,
+				    &client_context,
+				    name,
+				    GSS_C_NO_OID,
+				    (GSS_C_MUTUAL_FLAG
+					|GSS_C_CONF_FLAG
+					|GSS_C_INTEG_FLAG
+					|GSS_C_SEQUENCE_FLAG
+					|GSS_C_REPLAY_FLAG),
+				    0,
+				    GSS_C_NO_CHANNEL_BINDINGS,
+				    &res.output_token,
+				    &mech_type,
+				    &args.input_token,
+				    NULL,
+				    NULL);
+				if (GSS_ERROR(maj_stat)) {
+					printf("gss_init_sec_context failed\n");
+					report_error(mech_type, maj_stat, min_stat);
+					goto out;
+				}
+				if (args.input_token.length) {
+					args.step = 1;
+					syscall(syscall_num, 2, &args, &res);
+					gss_release_buffer(&min_stat,
+					    &args.input_token);
+					if (res.maj_stat != GSS_S_COMPLETE
+					    && res.maj_stat != GSS_S_CONTINUE_NEEDED) {
+						printf("gss_accept_sec_context (kernel) failed\n");
+						report_error(mech_type, res.maj_stat,
+						    res.min_stat);
+						goto out;
+					}
+				}
+				if (maj_stat == GSS_S_COMPLETE)
+					established = 1;
+			}
+
+			message_buf.value = "Hello world";
+			message_buf.length = strlen((char *) message_buf.value);
+
+			maj_stat = gss_get_mic(&min_stat, client_context,
+			    GSS_C_QOP_DEFAULT, &message_buf, &args.input_token);
+			if (GSS_ERROR(maj_stat)) {
+				printf("gss_get_mic failed\n");
+				report_error(mech_type, maj_stat, min_stat);
+				goto out;
+			}
+		
+			args.step = 2;
+			syscall(syscall_num, 2, &args, &res);
+			gss_release_buffer(&min_stat, &args.input_token);
+			if (GSS_ERROR(res.maj_stat)) {
+				printf("kernel gss_verify_mic failed\n");
+				report_error(mech_type, res.maj_stat, res.min_stat);
+				goto out;
+			}
+
+			maj_stat = gss_verify_mic(&min_stat, client_context,
+			    &message_buf, &res.output_token, NULL);
+			if (GSS_ERROR(maj_stat)) {
+				printf("gss_verify_mic failed\n");
+				report_error(mech_type, maj_stat, min_stat);
+				goto out;
+			}
+
+			maj_stat = gss_wrap(&min_stat, client_context,
+			    TRUE, GSS_C_QOP_DEFAULT, &message_buf, NULL,
+			    &args.input_token);
+			if (GSS_ERROR(maj_stat)) {
+				printf("gss_wrap failed\n");
+				report_error(mech_type, maj_stat, min_stat);
+				goto out;
+			}
+
+			args.step = 3;
+			syscall(syscall_num, 2, &args, &res);
+			gss_release_buffer(&min_stat, &args.input_token);
+			if (GSS_ERROR(res.maj_stat)) {
+				printf("kernel gss_unwrap failed\n");
+				report_error(mech_type, res.maj_stat, res.min_stat);
+				goto out;
+			}
+
+			maj_stat = gss_unwrap(&min_stat, client_context,
+			    &res.output_token, &message_buf, NULL, NULL);
+			if (GSS_ERROR(maj_stat)) {
+				printf("gss_unwrap failed\n");
+				report_error(mech_type, maj_stat, min_stat);
+				goto out;
+			}
+			gss_release_buffer(&min_stat, &message_buf);
+
+			maj_stat = gss_wrap(&min_stat, client_context,
+			    FALSE, GSS_C_QOP_DEFAULT, &message_buf, NULL,
+			    &args.input_token);
+			if (GSS_ERROR(maj_stat)) {
+				printf("gss_wrap failed\n");
+				report_error(mech_type, maj_stat, min_stat);
+				goto out;
+			}
+
+			args.step = 4;
+			syscall(syscall_num, 2, &args, &res);
+			gss_release_buffer(&min_stat, &args.input_token);
+			if (GSS_ERROR(res.maj_stat)) {
+				printf("kernel gss_unwrap failed\n");
+				report_error(mech_type, res.maj_stat, res.min_stat);
+				goto out;
+			}
+
+			maj_stat = gss_unwrap(&min_stat, client_context,
+			    &res.output_token, &message_buf, NULL, NULL);
+			if (GSS_ERROR(maj_stat)) {
+				printf("gss_unwrap failed\n");
+				report_error(mech_type, maj_stat, min_stat);
+				goto out;
+			}
+			gss_release_buffer(&min_stat, &message_buf);
+
+			args.step = 5;
+			syscall(syscall_num, 2, &args, &res);
+
+			gss_release_name(&min_stat, &name);
+			gss_release_cred(&min_stat, &client_cred);
+			gss_delete_sec_context(&min_stat, &client_context,
+			    GSS_C_NO_BUFFER);
+		}
+
+		break;
+	}
+	case 3:
+		syscall(syscall_num, 3, NULL, NULL);
+		break;
+	case 4:
+		syscall(syscall_num, 4, NULL, NULL);
+		break;
+	}
+	return (0);
+
+out:
+	return (1);
+}
diff --git a/tools/regression/rpcsec_gss/Makefile b/tools/regression/rpcsec_gss/Makefile
new file mode 100644
index 0000000..29b14d6
--- /dev/null
+++ b/tools/regression/rpcsec_gss/Makefile
@@ -0,0 +1,9 @@
+# $FreeBSD$
+
+PROG=	rpctest
+NO_MAN=
+WARNS?=	6
+LDADD=	-lrpcsec_gss
+DEBUG_FLAGS= -g -O0
+
+.include <bsd.prog.mk>
diff --git a/tools/regression/rpcsec_gss/rpctest.c b/tools/regression/rpcsec_gss/rpctest.c
new file mode 100644
index 0000000..847ae3b
--- /dev/null
+++ b/tools/regression/rpcsec_gss/rpctest.c
@@ -0,0 +1,400 @@
+/*-
+ * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
+ * Authors: Doug Rabson <dfr@rabson.org>
+ * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifdef __FreeBSD__
+#include <sys/cdefs.h>
+#else
+#define __unused
+#endif
+
+#include <ctype.h>
+#include <err.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <rpc/rpc.h>
+#include <rpc/rpcsec_gss.h>
+
+static rpc_gss_principal_t server_acl = NULL;
+
+static void
+usage(void)
+{
+	printf("rpctest client | server\n");
+	exit(1);
+}
+
+static void
+print_principal(rpc_gss_principal_t principal)
+{
+	int i, len, n;
+	uint8_t *p;
+
+	len = principal->len;
+	p = (uint8_t *) principal->name;
+	while (len > 0) {
+		n = len;
+		if (n > 16)
+			n = 16;
+		for (i = 0; i < n; i++)
+			printf("%02x ", p[i]);
+		for (; i < 16; i++)
+			printf("   ");
+		printf("|");
+		for (i = 0; i < n; i++)
+			printf("%c", isprint(p[i]) ? p[i] : '.');
+		printf("|\n");
+		len -= n;
+		p += n;
+	}
+}
+
+static void
+test_client(int argc, const char **argv)
+{
+	rpcproc_t prog = 123456;
+	rpcvers_t vers = 1;
+	const char *netid = "tcp";
+	char hostname[128], service[128+5];
+	CLIENT *client;
+	AUTH *auth;
+	const char **mechs;
+	rpc_gss_options_req_t options_req;
+	rpc_gss_options_ret_t options_ret;
+	rpc_gss_service_t svc;
+	struct timeval tv;
+	enum clnt_stat stat;
+
+	if (argc == 2)
+		strlcpy(hostname, argv[1], sizeof(hostname));
+	else
+		gethostname(hostname, sizeof(hostname));
+
+	client = clnt_create(hostname, prog, vers, netid);
+	if (!client) {
+		printf("rpc_createerr.cf_stat = %d\n",
+		    rpc_createerr.cf_stat);
+		printf("rpc_createerr.cf_error.re_errno = %d\n",
+		    rpc_createerr.cf_error.re_errno);
+		return;
+	}
+	
+	strcpy(service, "host");
+	strcat(service, "@");
+	strcat(service, hostname);
+
+	mechs = rpc_gss_get_mechanisms();
+	auth = NULL;
+	while (*mechs) {
+		options_req.req_flags = GSS_C_MUTUAL_FLAG;
+		options_req.time_req = 600;
+		options_req.my_cred = GSS_C_NO_CREDENTIAL;
+		options_req.input_channel_bindings = NULL;
+		auth = rpc_gss_seccreate(client, service,
+		    *mechs,
+		    rpc_gss_svc_none,
+		    NULL,
+		    &options_req,
+		    &options_ret);
+		if (auth)
+			break;
+		mechs++;
+	}
+	if (!auth) {
+		clnt_pcreateerror("rpc_gss_seccreate");
+		printf("Can't authenticate with server %s.\n",
+		    hostname);
+		exit(1);
+	}
+	client->cl_auth = auth;
+
+	for (svc = rpc_gss_svc_none; svc <= rpc_gss_svc_privacy; svc++) {
+		const char *svc_names[] = {
+			"rpc_gss_svc_default",
+			"rpc_gss_svc_none",
+			"rpc_gss_svc_integrity",
+			"rpc_gss_svc_privacy"
+		};
+		int num;
+
+		rpc_gss_set_defaults(auth, svc, NULL);
+		tv.tv_sec = 5;
+		tv.tv_usec = 0;
+		num = 42;
+		stat = CLNT_CALL(client, 1,
+		    (xdrproc_t) xdr_int, (char *) &num,
+		    (xdrproc_t) xdr_int, (char *) &num, tv);
+		if (stat == RPC_SUCCESS) {
+			printf("succeeded with %s\n", svc_names[svc]);
+			if (num != 142)
+				printf("unexpected reply %d\n", num);
+		} else {
+			clnt_perror(client, "call failed");
+		}
+	}
+	AUTH_DESTROY(auth);
+	CLNT_DESTROY(client);
+}
+
+static void
+server_program_1(struct svc_req *rqstp, register SVCXPRT *transp)
+{
+	rpc_gss_rawcred_t *rcred;
+	rpc_gss_ucred_t *ucred;
+	int		i, num;
+
+	if (rqstp->rq_cred.oa_flavor != RPCSEC_GSS) {
+		svcerr_weakauth(transp);
+		return;
+	}		
+		
+	if (!rpc_gss_getcred(rqstp, &rcred, &ucred, NULL)) {
+		svcerr_systemerr(transp);
+		return;
+	}
+
+	printf("svc=%d, mech=%s, uid=%d, gid=%d, gids={",
+	    rcred->service, rcred->mechanism, ucred->uid, ucred->gid);
+	for (i = 0; i < ucred->gidlen; i++) {
+		if (i > 0) printf(",");
+		printf("%d", ucred->gidlist[i]);
+	}
+	printf("}\n");
+
+	switch (rqstp->rq_proc) {
+	case 0:
+		if (!svc_getargs(transp, (xdrproc_t) xdr_void, 0)) {
+			svcerr_decode(transp);
+			goto out;
+		}
+		if (!svc_sendreply(transp, (xdrproc_t) xdr_void, 0)) {
+			svcerr_systemerr(transp);
+		}
+		goto out;
+
+	case 1:
+		if (!svc_getargs(transp, (xdrproc_t) xdr_int,
+			(char *) &num)) {
+			svcerr_decode(transp);
+			goto out;
+		}
+		num += 100;
+		if (!svc_sendreply(transp, (xdrproc_t) xdr_int,
+			(char *) &num)) {
+			svcerr_systemerr(transp);
+		}
+		goto out;
+
+	default:
+		svcerr_noproc(transp);
+		goto out;
+	}
+
+out:
+	return;
+}
+
+#if 0
+static void
+report_error(gss_OID mech, OM_uint32 maj, OM_uint32 min)
+{
+	OM_uint32 maj_stat, min_stat;
+	OM_uint32 message_context;
+	gss_buffer_desc buf;
+
+	printf("major_stat=%d, minor_stat=%d\n", maj, min);
+
+	message_context = 0;
+	do {
+		maj_stat = gss_display_status(&min_stat, maj,
+		    GSS_C_GSS_CODE, GSS_C_NO_OID, &message_context, &buf);
+		printf("%.*s\n", (int)buf.length, (char *) buf.value);
+		gss_release_buffer(&min_stat, &buf);
+	} while (message_context);
+	if (mech) {
+		message_context = 0;
+		do {
+			maj_stat = gss_display_status(&min_stat, min,
+			    GSS_C_MECH_CODE, mech, &message_context, &buf);
+			printf("%.*s\n", (int)buf.length, (char *) buf.value);
+			gss_release_buffer(&min_stat, &buf);
+		} while (message_context);
+	}
+	exit(1);
+}
+#endif
+
+static bool_t
+server_new_context(__unused struct svc_req *req,
+    __unused gss_cred_id_t deleg,
+    __unused gss_ctx_id_t gss_context,
+    rpc_gss_lock_t *lock,
+    __unused void **cookie)
+{
+	rpc_gss_rawcred_t *rcred = lock->raw_cred;
+
+	printf("new security context version=%d, mech=%s, qop=%s:\n",
+	    rcred->version, rcred->mechanism, rcred->qop);
+	print_principal(rcred->client_principal);
+
+	if (!server_acl)
+		return (TRUE);
+
+	if (rcred->client_principal->len != server_acl->len
+	    || memcmp(rcred->client_principal->name, server_acl->name,
+		server_acl->len)) {
+		return (FALSE);
+	}
+
+	return (TRUE);
+}
+
+static void
+test_server(__unused int argc, __unused const char **argv)
+{
+	char hostname[128];
+	char principal[128 + 5];
+	const char **mechs;
+	static rpc_gss_callback_t cb;
+
+	if (argc == 3) {
+		if (!rpc_gss_get_principal_name(&server_acl, argv[1],
+			argv[2], NULL, NULL)) {
+			printf("Can't create %s ACL entry for %s\n",
+			    argv[1], argv[2]);
+			return;
+		}
+	}
+
+	gethostname(hostname, sizeof(hostname));;
+	snprintf(principal, sizeof(principal), "host@%s", hostname);
+
+	mechs = rpc_gss_get_mechanisms();
+	while (*mechs) {
+		if (!rpc_gss_set_svc_name(principal, *mechs, GSS_C_INDEFINITE,
+			123456, 1)) {
+			rpc_gss_error_t e;
+
+			rpc_gss_get_error(&e);
+			printf("setting name for %s for %s failed: %d, %d\n",
+			    principal, *mechs,
+			     e.rpc_gss_error, e.system_error);
+
+#if 0
+			gss_OID mech_oid;
+			gss_OID_set_desc oid_set;
+			gss_name_t name;
+			OM_uint32 maj_stat, min_stat;
+			gss_buffer_desc namebuf;
+			gss_cred_id_t cred;
+
+			rpc_gss_mech_to_oid(*mechs, &mech_oid);
+			oid_set.count = 1;
+			oid_set.elements = mech_oid;
+
+			namebuf.value = principal;
+			namebuf.length = strlen(principal);
+			maj_stat = gss_import_name(&min_stat, &namebuf,
+			    GSS_C_NT_HOSTBASED_SERVICE, &name);
+			if (maj_stat) {
+				printf("gss_import_name failed\n");
+				report_error(mech_oid, maj_stat, min_stat);
+			}
+			maj_stat = gss_acquire_cred(&min_stat, name,
+			    0, &oid_set, GSS_C_ACCEPT, &cred, NULL, NULL);
+			if (maj_stat) {
+				printf("gss_acquire_cred failed\n");
+				report_error(mech_oid, maj_stat, min_stat);
+			}
+#endif
+		}
+		mechs++;
+	}
+
+	cb.program = 123456;
+	cb.version = 1;
+	cb.callback = server_new_context;
+	rpc_gss_set_callback(&cb);
+
+	svc_create(server_program_1, 123456, 1, 0);
+	svc_run();
+}
+
+static void
+test_get_principal_name(int argc, const char **argv)
+{
+	const char *mechname, *name, *node, *domain;
+	rpc_gss_principal_t principal;
+
+	if (argc < 3 || argc > 5) {
+		printf("usage: rpctest principal <mechname> <name> "
+		    "[<node> [<domain>] ]\n");
+		exit(1);
+	}
+
+	mechname = argv[1];
+	name = argv[2];
+	node = NULL;
+	domain = NULL;
+	if (argc > 3) {
+		node = argv[3];
+		if (argc > 4)
+			domain = argv[4];
+	}
+
+	if (rpc_gss_get_principal_name(&principal, mechname, name,
+		node, domain)) {
+		printf("succeeded:\n");
+		print_principal(principal);
+		free(principal);
+	} else {
+		printf("failed\n");
+	}
+}
+
+int
+main(int argc, const char **argv)
+{
+
+	if (argc < 2)
+		usage();
+	if (!strcmp(argv[1], "client"))
+		test_client(argc - 1, argv + 1);
+	else if (!strcmp(argv[1], "server"))
+		test_server(argc - 1, argv + 1);
+	else if (!strcmp(argv[1], "principal"))
+		test_get_principal_name(argc - 1, argv + 1);
+	else
+		usage();
+
+	return (0);
+}