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("$FreeBSD$");
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        sun.sun_family = AF_LOCAL;
109        strcpy(sun.sun_path, path);
110        sun.sun_len = SUN_LEN(&sun);
111
112        nconf = getnetconfigent("local");
113        cl = clnt_reconnect_create(nconf,
114	    (struct sockaddr *) &sun, GSSD, GSSDVERS,
115	    RPC_MAXDATASIZE, RPC_MAXDATASIZE);
116
117	mtx_lock(&kgss_gssd_lock);
118	oldcl = kgss_gssd_handle;
119	kgss_gssd_handle = cl;
120	mtx_unlock(&kgss_gssd_lock);
121
122	if (oldcl != NULL) {
123		CLNT_CLOSE(oldcl);
124		CLNT_RELEASE(oldcl);
125	}
126
127	return (0);
128}
129
130int
131kgss_oid_equal(const gss_OID oid1, const gss_OID oid2)
132{
133
134	if (oid1 == oid2)
135		return (1);
136	if (!oid1 || !oid2)
137		return (0);
138	if (oid1->length != oid2->length)
139		return (0);
140	if (memcmp(oid1->elements, oid2->elements, oid1->length))
141		return (0);
142	return (1);
143}
144
145void
146kgss_install_mech(gss_OID mech_type, const char *name, struct kobj_class *cls)
147{
148	struct kgss_mech *km;
149
150	km = malloc(sizeof(struct kgss_mech), M_GSSAPI, M_WAITOK);
151	km->km_mech_type = mech_type;
152	km->km_mech_name = name;
153	km->km_class = cls;
154	LIST_INSERT_HEAD(&kgss_mechs, km, km_link);
155}
156
157void
158kgss_uninstall_mech(gss_OID mech_type)
159{
160	struct kgss_mech *km;
161
162	LIST_FOREACH(km, &kgss_mechs, km_link) {
163		if (kgss_oid_equal(km->km_mech_type, mech_type)) {
164			LIST_REMOVE(km, km_link);
165			free(km, M_GSSAPI);
166			return;
167		}
168	}
169}
170
171gss_OID
172kgss_find_mech_by_name(const char *name)
173{
174	struct kgss_mech *km;
175
176	LIST_FOREACH(km, &kgss_mechs, km_link) {
177		if (!strcmp(km->km_mech_name, name)) {
178			return (km->km_mech_type);
179		}
180	}
181	return (GSS_C_NO_OID);
182}
183
184const char *
185kgss_find_mech_by_oid(const gss_OID oid)
186{
187	struct kgss_mech *km;
188
189	LIST_FOREACH(km, &kgss_mechs, km_link) {
190		if (kgss_oid_equal(km->km_mech_type, oid)) {
191			return (km->km_mech_name);
192		}
193	}
194	return (NULL);
195}
196
197gss_ctx_id_t
198kgss_create_context(gss_OID mech_type)
199{
200	struct kgss_mech *km;
201	gss_ctx_id_t ctx;
202
203	LIST_FOREACH(km, &kgss_mechs, km_link) {
204		if (kgss_oid_equal(km->km_mech_type, mech_type))
205			break;
206	}
207	if (!km)
208		return (NULL);
209
210	ctx = (gss_ctx_id_t) kobj_create(km->km_class, M_GSSAPI, M_WAITOK);
211	KGSS_INIT(ctx);
212
213	return (ctx);
214}
215
216void
217kgss_delete_context(gss_ctx_id_t ctx, gss_buffer_t output_token)
218{
219
220	KGSS_DELETE(ctx, output_token);
221	kobj_delete((kobj_t) ctx, M_GSSAPI);
222}
223
224OM_uint32
225kgss_transfer_context(gss_ctx_id_t ctx)
226{
227	struct export_sec_context_res res;
228	struct export_sec_context_args args;
229	enum clnt_stat stat;
230	OM_uint32 maj_stat;
231
232	if (!kgss_gssd_handle)
233		return (GSS_S_FAILURE);
234
235	args.ctx = ctx->handle;
236	bzero(&res, sizeof(res));
237	stat = gssd_export_sec_context_1(&args, &res, kgss_gssd_handle);
238	if (stat != RPC_SUCCESS) {
239		return (GSS_S_FAILURE);
240	}
241
242	maj_stat = KGSS_IMPORT(ctx, res.format, &res.interprocess_token);
243	ctx->handle = 0;
244
245	xdr_free((xdrproc_t) xdr_export_sec_context_res, &res);
246
247	return (maj_stat);
248}
249
250void
251kgss_copy_buffer(const gss_buffer_t from, gss_buffer_t to)
252{
253	to->length = from->length;
254	if (from->length) {
255		to->value = malloc(from->length, M_GSSAPI, M_WAITOK);
256		bcopy(from->value, to->value, from->length);
257	} else {
258		to->value = NULL;
259	}
260}
261
262/*
263 * Acquire the kgss_gssd_handle and return it with a reference count,
264 * if it is available.
265 */
266CLIENT *
267kgss_gssd_client(void)
268{
269	CLIENT *cl;
270
271	mtx_lock(&kgss_gssd_lock);
272	cl = kgss_gssd_handle;
273	if (cl != NULL)
274		CLNT_ACQUIRE(cl);
275	mtx_unlock(&kgss_gssd_lock);
276	return (cl);
277}
278
279/*
280 * Kernel module glue
281 */
282static int
283kgssapi_modevent(module_t mod, int type, void *data)
284{
285	int error = 0;
286
287	switch (type) {
288	case MOD_LOAD:
289		rpc_gss_entries.rpc_gss_secfind = rpc_gss_secfind;
290		rpc_gss_entries.rpc_gss_secpurge = rpc_gss_secpurge;
291		rpc_gss_entries.rpc_gss_seccreate = rpc_gss_seccreate;
292		rpc_gss_entries.rpc_gss_set_defaults = rpc_gss_set_defaults;
293		rpc_gss_entries.rpc_gss_max_data_length =
294		    rpc_gss_max_data_length;
295		rpc_gss_entries.rpc_gss_get_error = rpc_gss_get_error;
296		rpc_gss_entries.rpc_gss_mech_to_oid = rpc_gss_mech_to_oid;
297		rpc_gss_entries.rpc_gss_oid_to_mech = rpc_gss_oid_to_mech;
298		rpc_gss_entries.rpc_gss_qop_to_num = rpc_gss_qop_to_num;
299		rpc_gss_entries.rpc_gss_get_mechanisms = rpc_gss_get_mechanisms;
300		rpc_gss_entries.rpc_gss_get_versions = rpc_gss_get_versions;
301		rpc_gss_entries.rpc_gss_is_installed = rpc_gss_is_installed;
302		rpc_gss_entries.rpc_gss_set_svc_name = rpc_gss_set_svc_name;
303		rpc_gss_entries.rpc_gss_clear_svc_name = rpc_gss_clear_svc_name;
304		rpc_gss_entries.rpc_gss_getcred = rpc_gss_getcred;
305		rpc_gss_entries.rpc_gss_set_callback = rpc_gss_set_callback;
306		rpc_gss_entries.rpc_gss_clear_callback = rpc_gss_clear_callback;
307		rpc_gss_entries.rpc_gss_get_principal_name =
308		    rpc_gss_get_principal_name;
309		rpc_gss_entries.rpc_gss_svc_max_data_length =
310		    rpc_gss_svc_max_data_length;
311		mtx_init(&kgss_gssd_lock, "kgss_gssd_lock", NULL, MTX_DEF);
312		break;
313	case MOD_UNLOAD:
314		/*
315		 * Unloading of the kgssapi module is not currently supported.
316		 * If somebody wants this, we would need to keep track of
317		 * currently executing threads and make sure the count is 0.
318		 */
319		/* FALLTHROUGH */
320	default:
321		error = EOPNOTSUPP;
322	};
323	return (error);
324}
325static moduledata_t kgssapi_mod = {
326	"kgssapi",
327	kgssapi_modevent,
328	NULL,
329};
330DECLARE_MODULE(kgssapi, kgssapi_mod, SI_SUB_VFS, SI_ORDER_ANY);
331MODULE_DEPEND(kgssapi, krpc, 1, 1, 1);
332MODULE_VERSION(kgssapi, 1);
333