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: releng/10.1/sys/kgssapi/gss_impl.c 253049 2013-07-09 01:05:28Z rmacklem $");
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
52 MALLOC_DEFINE(M_GSSAPI, "GSS-API", "GSS-API");
53
54 /*
55 * Syscall hooks
56 */
57 static int gssd_syscall_offset = SYS_gssd_syscall;
58 static struct sysent gssd_syscall_prev_sysent;
59 MAKE_SYSENT(gssd_syscall);
60 static bool_t gssd_syscall_registered = FALSE;
61
62 struct kgss_mech_list kgss_mechs;
63 CLIENT *kgss_gssd_handle;
64 struct mtx kgss_gssd_lock;
65
66 static void
67 kgss_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 }
79 SYSINIT(kgss_init, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_init, NULL);
80
81 static void
82 kgss_uninit(void *dummy)
83 {
84
85 if (gssd_syscall_registered)
86 syscall_deregister(&gssd_syscall_offset,
87 &gssd_syscall_prev_sysent);
88 }
89 SYSUNINIT(kgss_uninit, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_uninit, NULL);
90
91 int
92 sys_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
130 int
131 kgss_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
145 void
146 kgss_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
157 void
158 kgss_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
171 gss_OID
172 kgss_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
184 const char *
185 kgss_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
197 gss_ctx_id_t
198 kgss_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
216 void
217 kgss_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
224 OM_uint32
225 kgss_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
250 void
251 kgss_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 */
266 CLIENT *
267 kgss_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 */
282 static int
283 kgssapi_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_refresh_auth = rpc_gss_refresh_auth;
290 rpc_gss_entries.rpc_gss_secfind = rpc_gss_secfind;
291 rpc_gss_entries.rpc_gss_secpurge = rpc_gss_secpurge;
292 rpc_gss_entries.rpc_gss_seccreate = rpc_gss_seccreate;
293 rpc_gss_entries.rpc_gss_set_defaults = rpc_gss_set_defaults;
294 rpc_gss_entries.rpc_gss_max_data_length =
295 rpc_gss_max_data_length;
296 rpc_gss_entries.rpc_gss_get_error = rpc_gss_get_error;
297 rpc_gss_entries.rpc_gss_mech_to_oid = rpc_gss_mech_to_oid;
298 rpc_gss_entries.rpc_gss_oid_to_mech = rpc_gss_oid_to_mech;
299 rpc_gss_entries.rpc_gss_qop_to_num = rpc_gss_qop_to_num;
300 rpc_gss_entries.rpc_gss_get_mechanisms = rpc_gss_get_mechanisms;
301 rpc_gss_entries.rpc_gss_get_versions = rpc_gss_get_versions;
302 rpc_gss_entries.rpc_gss_is_installed = rpc_gss_is_installed;
303 rpc_gss_entries.rpc_gss_set_svc_name = rpc_gss_set_svc_name;
304 rpc_gss_entries.rpc_gss_clear_svc_name = rpc_gss_clear_svc_name;
305 rpc_gss_entries.rpc_gss_getcred = rpc_gss_getcred;
306 rpc_gss_entries.rpc_gss_set_callback = rpc_gss_set_callback;
307 rpc_gss_entries.rpc_gss_clear_callback = rpc_gss_clear_callback;
308 rpc_gss_entries.rpc_gss_get_principal_name =
309 rpc_gss_get_principal_name;
310 rpc_gss_entries.rpc_gss_svc_max_data_length =
311 rpc_gss_svc_max_data_length;
312 mtx_init(&kgss_gssd_lock, "kgss_gssd_lock", NULL, MTX_DEF);
313 break;
314 case MOD_UNLOAD:
315 /*
316 * Unloading of the kgssapi module is not currently supported.
317 * If somebody wants this, we would need to keep track of
318 * currently executing threads and make sure the count is 0.
319 */
320 /* FALLTHROUGH */
321 default:
322 error = EOPNOTSUPP;
323 };
324 return (error);
325 }
326 static moduledata_t kgssapi_mod = {
327 "kgssapi",
328 kgssapi_modevent,
329 NULL,
330 };
331 DECLARE_MODULE(kgssapi, kgssapi_mod, SI_SUB_VFS, SI_ORDER_ANY);
332 MODULE_DEPEND(kgssapi, krpc, 1, 1, 1);
333 MODULE_VERSION(kgssapi, 1);
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