gss_impl.c revision 293446 
1/*-
2 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
3 * Authors: Doug Rabson <dfr@rabson.org>
4 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: stable/10/sys/kgssapi/gss_impl.c 293446 2016-01-08 23:58:32Z jpaetzel $");
30
31#include <sys/param.h>
32#include <sys/kernel.h>
33#include <sys/kobj.h>
34#include <sys/lock.h>
35#include <sys/malloc.h>
36#include <sys/module.h>
37#include <sys/mutex.h>
38#include <sys/priv.h>
39#include <sys/syscall.h>
40#include <sys/sysent.h>
41#include <sys/sysproto.h>
42
43#include <kgssapi/gssapi.h>
44#include <kgssapi/gssapi_impl.h>
45#include <rpc/rpc.h>
46#include <rpc/rpc_com.h>
47#include <rpc/rpcsec_gss.h>
48
49#include "gssd.h"
50#include "kgss_if.h"
51
52MALLOC_DEFINE(M_GSSAPI, "GSS-API", "GSS-API");
53
54/*
55 * Syscall hooks
56 */
57static int gssd_syscall_offset = SYS_gssd_syscall;
58static struct sysent gssd_syscall_prev_sysent;
59MAKE_SYSENT(gssd_syscall);
60static bool_t gssd_syscall_registered = FALSE;
61
62struct kgss_mech_list kgss_mechs;
63CLIENT *kgss_gssd_handle;
64struct mtx kgss_gssd_lock;
65
66static void
67kgss_init(void *dummy)
68{
69	int error;
70
71	LIST_INIT(&kgss_mechs);
72	error = syscall_register(&gssd_syscall_offset, &gssd_syscall_sysent,
73	    &gssd_syscall_prev_sysent);
74	if (error)
75		printf("Can't register GSSD syscall\n");
76	else
77		gssd_syscall_registered = TRUE;
78}
79SYSINIT(kgss_init, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_init, NULL);
80
81static void
82kgss_uninit(void *dummy)
83{
84
85	if (gssd_syscall_registered)
86		syscall_deregister(&gssd_syscall_offset,
87		    &gssd_syscall_prev_sysent);
88}
89SYSUNINIT(kgss_uninit, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_uninit, NULL);
90
91int
92sys_gssd_syscall(struct thread *td, struct gssd_syscall_args *uap)
93{
94        struct sockaddr_un sun;
95        struct netconfig *nconf;
96	char path[MAXPATHLEN];
97	int error;
98	CLIENT *cl, *oldcl;
99
100	error = priv_check(td, PRIV_NFS_DAEMON);
101	if (error)
102		return (error);
103
104	error = copyinstr(uap->path, path, sizeof(path), NULL);
105	if (error)
106		return (error);
107
108	if (path[0] != '\0') {
109		sun.sun_family = AF_LOCAL;
110		strcpy(sun.sun_path, path);
111		sun.sun_len = SUN_LEN(&sun);
112
113		nconf = getnetconfigent("local");
114		cl = clnt_reconnect_create(nconf,
115		    (struct sockaddr *) &sun, GSSD, GSSDVERS,
116		    RPC_MAXDATASIZE, RPC_MAXDATASIZE);
117	} else
118		cl = NULL;
119
120	mtx_lock(&kgss_gssd_lock);
121	oldcl = kgss_gssd_handle;
122	kgss_gssd_handle = cl;
123	mtx_unlock(&kgss_gssd_lock);
124
125	if (oldcl != NULL) {
126		CLNT_CLOSE(oldcl);
127		CLNT_RELEASE(oldcl);
128	}
129
130	return (0);
131}
132
133int
134kgss_oid_equal(const gss_OID oid1, const gss_OID oid2)
135{
136
137	if (oid1 == oid2)
138		return (1);
139	if (!oid1 || !oid2)
140		return (0);
141	if (oid1->length != oid2->length)
142		return (0);
143	if (memcmp(oid1->elements, oid2->elements, oid1->length))
144		return (0);
145	return (1);
146}
147
148void
149kgss_install_mech(gss_OID mech_type, const char *name, struct kobj_class *cls)
150{
151	struct kgss_mech *km;
152
153	km = malloc(sizeof(struct kgss_mech), M_GSSAPI, M_WAITOK);
154	km->km_mech_type = mech_type;
155	km->km_mech_name = name;
156	km->km_class = cls;
157	LIST_INSERT_HEAD(&kgss_mechs, km, km_link);
158}
159
160void
161kgss_uninstall_mech(gss_OID mech_type)
162{
163	struct kgss_mech *km;
164
165	LIST_FOREACH(km, &kgss_mechs, km_link) {
166		if (kgss_oid_equal(km->km_mech_type, mech_type)) {
167			LIST_REMOVE(km, km_link);
168			free(km, M_GSSAPI);
169			return;
170		}
171	}
172}
173
174gss_OID
175kgss_find_mech_by_name(const char *name)
176{
177	struct kgss_mech *km;
178
179	LIST_FOREACH(km, &kgss_mechs, km_link) {
180		if (!strcmp(km->km_mech_name, name)) {
181			return (km->km_mech_type);
182		}
183	}
184	return (GSS_C_NO_OID);
185}
186
187const char *
188kgss_find_mech_by_oid(const gss_OID oid)
189{
190	struct kgss_mech *km;
191
192	LIST_FOREACH(km, &kgss_mechs, km_link) {
193		if (kgss_oid_equal(km->km_mech_type, oid)) {
194			return (km->km_mech_name);
195		}
196	}
197	return (NULL);
198}
199
200gss_ctx_id_t
201kgss_create_context(gss_OID mech_type)
202{
203	struct kgss_mech *km;
204	gss_ctx_id_t ctx;
205
206	LIST_FOREACH(km, &kgss_mechs, km_link) {
207		if (kgss_oid_equal(km->km_mech_type, mech_type))
208			break;
209	}
210	if (!km)
211		return (NULL);
212
213	ctx = (gss_ctx_id_t) kobj_create(km->km_class, M_GSSAPI, M_WAITOK);
214	KGSS_INIT(ctx);
215
216	return (ctx);
217}
218
219void
220kgss_delete_context(gss_ctx_id_t ctx, gss_buffer_t output_token)
221{
222
223	KGSS_DELETE(ctx, output_token);
224	kobj_delete((kobj_t) ctx, M_GSSAPI);
225}
226
227OM_uint32
228kgss_transfer_context(gss_ctx_id_t ctx)
229{
230	struct export_sec_context_res res;
231	struct export_sec_context_args args;
232	enum clnt_stat stat;
233	OM_uint32 maj_stat;
234
235	if (!kgss_gssd_handle)
236		return (GSS_S_FAILURE);
237
238	args.ctx = ctx->handle;
239	bzero(&res, sizeof(res));
240	stat = gssd_export_sec_context_1(&args, &res, kgss_gssd_handle);
241	if (stat != RPC_SUCCESS) {
242		return (GSS_S_FAILURE);
243	}
244
245	maj_stat = KGSS_IMPORT(ctx, res.format, &res.interprocess_token);
246	ctx->handle = 0;
247
248	xdr_free((xdrproc_t) xdr_export_sec_context_res, &res);
249
250	return (maj_stat);
251}
252
253void
254kgss_copy_buffer(const gss_buffer_t from, gss_buffer_t to)
255{
256	to->length = from->length;
257	if (from->length) {
258		to->value = malloc(from->length, M_GSSAPI, M_WAITOK);
259		bcopy(from->value, to->value, from->length);
260	} else {
261		to->value = NULL;
262	}
263}
264
265/*
266 * Acquire the kgss_gssd_handle and return it with a reference count,
267 * if it is available.
268 */
269CLIENT *
270kgss_gssd_client(void)
271{
272	CLIENT *cl;
273
274	mtx_lock(&kgss_gssd_lock);
275	cl = kgss_gssd_handle;
276	if (cl != NULL)
277		CLNT_ACQUIRE(cl);
278	mtx_unlock(&kgss_gssd_lock);
279	return (cl);
280}
281
282/*
283 * Kernel module glue
284 */
285static int
286kgssapi_modevent(module_t mod, int type, void *data)
287{
288	int error = 0;
289
290	switch (type) {
291	case MOD_LOAD:
292		rpc_gss_entries.rpc_gss_refresh_auth = rpc_gss_refresh_auth;
293		rpc_gss_entries.rpc_gss_secfind = rpc_gss_secfind;
294		rpc_gss_entries.rpc_gss_secpurge = rpc_gss_secpurge;
295		rpc_gss_entries.rpc_gss_seccreate = rpc_gss_seccreate;
296		rpc_gss_entries.rpc_gss_set_defaults = rpc_gss_set_defaults;
297		rpc_gss_entries.rpc_gss_max_data_length =
298		    rpc_gss_max_data_length;
299		rpc_gss_entries.rpc_gss_get_error = rpc_gss_get_error;
300		rpc_gss_entries.rpc_gss_mech_to_oid = rpc_gss_mech_to_oid;
301		rpc_gss_entries.rpc_gss_oid_to_mech = rpc_gss_oid_to_mech;
302		rpc_gss_entries.rpc_gss_qop_to_num = rpc_gss_qop_to_num;
303		rpc_gss_entries.rpc_gss_get_mechanisms = rpc_gss_get_mechanisms;
304		rpc_gss_entries.rpc_gss_get_versions = rpc_gss_get_versions;
305		rpc_gss_entries.rpc_gss_is_installed = rpc_gss_is_installed;
306		rpc_gss_entries.rpc_gss_set_svc_name = rpc_gss_set_svc_name;
307		rpc_gss_entries.rpc_gss_clear_svc_name = rpc_gss_clear_svc_name;
308		rpc_gss_entries.rpc_gss_getcred = rpc_gss_getcred;
309		rpc_gss_entries.rpc_gss_set_callback = rpc_gss_set_callback;
310		rpc_gss_entries.rpc_gss_clear_callback = rpc_gss_clear_callback;
311		rpc_gss_entries.rpc_gss_get_principal_name =
312		    rpc_gss_get_principal_name;
313		rpc_gss_entries.rpc_gss_svc_max_data_length =
314		    rpc_gss_svc_max_data_length;
315		mtx_init(&kgss_gssd_lock, "kgss_gssd_lock", NULL, MTX_DEF);
316		break;
317	case MOD_UNLOAD:
318		/*
319		 * Unloading of the kgssapi module is not currently supported.
320		 * If somebody wants this, we would need to keep track of
321		 * currently executing threads and make sure the count is 0.
322		 */
323		/* FALLTHROUGH */
324	default:
325		error = EOPNOTSUPP;
326	};
327	return (error);
328}
329static moduledata_t kgssapi_mod = {
330	"kgssapi",
331	kgssapi_modevent,
332	NULL,
333};
334DECLARE_MODULE(kgssapi, kgssapi_mod, SI_SUB_VFS, SI_ORDER_ANY);
335MODULE_DEPEND(kgssapi, krpc, 1, 1, 1);
336MODULE_VERSION(kgssapi, 1);
337