1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
5 * Authors: Doug Rabson <dfr@rabson.org>
6 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/12.0/sys/kgssapi/gss_impl.c 329251 2018-02-14 00:12:03Z cem $");
32
33 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/kobj.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/module.h>
39 #include <sys/mutex.h>
40 #include <sys/priv.h>
41 #include <sys/syscall.h>
42 #include <sys/sysent.h>
43 #include <sys/sysproto.h>
44
45 #include <kgssapi/gssapi.h>
46 #include <kgssapi/gssapi_impl.h>
47 #include <rpc/rpc.h>
48 #include <rpc/rpc_com.h>
49 #include <rpc/rpcsec_gss.h>
50
51 #include "gssd.h"
52 #include "kgss_if.h"
53
54 MALLOC_DEFINE(M_GSSAPI, "GSS-API", "GSS-API");
55
56 /*
57 * Syscall hooks
58 */
59 static struct syscall_helper_data gssd_syscalls[] = {
60 SYSCALL_INIT_HELPER(gssd_syscall),
61 SYSCALL_INIT_LAST
62 };
63
64 struct kgss_mech_list kgss_mechs;
65 CLIENT *kgss_gssd_handle;
66 struct mtx kgss_gssd_lock;
67
68 static int
69 kgss_load(void)
70 {
71 int error;
72
73 LIST_INIT(&kgss_mechs);
74 error = syscall_helper_register(gssd_syscalls, SY_THR_STATIC_KLD);
75 if (error != 0)
76 return (error);
77 return (0);
78 }
79
80 static void
81 kgss_unload(void)
82 {
83
84 syscall_helper_unregister(gssd_syscalls);
85 }
86
87 int
88 sys_gssd_syscall(struct thread *td, struct gssd_syscall_args *uap)
89 {
90 struct sockaddr_un sun;
91 struct netconfig *nconf;
92 char path[MAXPATHLEN];
93 int error;
94 CLIENT *cl, *oldcl;
95
96 error = priv_check(td, PRIV_NFS_DAEMON);
97 if (error)
98 return (error);
99
100 error = copyinstr(uap->path, path, sizeof(path), NULL);
101 if (error)
102 return (error);
103 if (strlen(path) + 1 > sizeof(sun.sun_path))
104 return (EINVAL);
105
106 if (path[0] != '\0') {
107 sun.sun_family = AF_LOCAL;
108 strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
109 sun.sun_len = SUN_LEN(&sun);
110
111 nconf = getnetconfigent("local");
112 cl = clnt_reconnect_create(nconf,
113 (struct sockaddr *) &sun, GSSD, GSSDVERS,
114 RPC_MAXDATASIZE, RPC_MAXDATASIZE);
115 } else
116 cl = NULL;
117
118 mtx_lock(&kgss_gssd_lock);
119 oldcl = kgss_gssd_handle;
120 kgss_gssd_handle = cl;
121 mtx_unlock(&kgss_gssd_lock);
122
123 if (oldcl != NULL) {
124 CLNT_CLOSE(oldcl);
125 CLNT_RELEASE(oldcl);
126 }
127
128 return (0);
129 }
130
131 int
132 kgss_oid_equal(const gss_OID oid1, const gss_OID oid2)
133 {
134
135 if (oid1 == oid2)
136 return (1);
137 if (!oid1 || !oid2)
138 return (0);
139 if (oid1->length != oid2->length)
140 return (0);
141 if (memcmp(oid1->elements, oid2->elements, oid1->length))
142 return (0);
143 return (1);
144 }
145
146 void
147 kgss_install_mech(gss_OID mech_type, const char *name, struct kobj_class *cls)
148 {
149 struct kgss_mech *km;
150
151 km = malloc(sizeof(struct kgss_mech), M_GSSAPI, M_WAITOK);
152 km->km_mech_type = mech_type;
153 km->km_mech_name = name;
154 km->km_class = cls;
155 LIST_INSERT_HEAD(&kgss_mechs, km, km_link);
156 }
157
158 void
159 kgss_uninstall_mech(gss_OID mech_type)
160 {
161 struct kgss_mech *km;
162
163 LIST_FOREACH(km, &kgss_mechs, km_link) {
164 if (kgss_oid_equal(km->km_mech_type, mech_type)) {
165 LIST_REMOVE(km, km_link);
166 free(km, M_GSSAPI);
167 return;
168 }
169 }
170 }
171
172 gss_OID
173 kgss_find_mech_by_name(const char *name)
174 {
175 struct kgss_mech *km;
176
177 LIST_FOREACH(km, &kgss_mechs, km_link) {
178 if (!strcmp(km->km_mech_name, name)) {
179 return (km->km_mech_type);
180 }
181 }
182 return (GSS_C_NO_OID);
183 }
184
185 const char *
186 kgss_find_mech_by_oid(const gss_OID oid)
187 {
188 struct kgss_mech *km;
189
190 LIST_FOREACH(km, &kgss_mechs, km_link) {
191 if (kgss_oid_equal(km->km_mech_type, oid)) {
192 return (km->km_mech_name);
193 }
194 }
195 return (NULL);
196 }
197
198 gss_ctx_id_t
199 kgss_create_context(gss_OID mech_type)
200 {
201 struct kgss_mech *km;
202 gss_ctx_id_t ctx;
203
204 LIST_FOREACH(km, &kgss_mechs, km_link) {
205 if (kgss_oid_equal(km->km_mech_type, mech_type))
206 break;
207 }
208 if (!km)
209 return (NULL);
210
211 ctx = (gss_ctx_id_t) kobj_create(km->km_class, M_GSSAPI, M_WAITOK);
212 KGSS_INIT(ctx);
213
214 return (ctx);
215 }
216
217 void
218 kgss_delete_context(gss_ctx_id_t ctx, gss_buffer_t output_token)
219 {
220
221 KGSS_DELETE(ctx, output_token);
222 kobj_delete((kobj_t) ctx, M_GSSAPI);
223 }
224
225 OM_uint32
226 kgss_transfer_context(gss_ctx_id_t ctx)
227 {
228 struct export_sec_context_res res;
229 struct export_sec_context_args args;
230 enum clnt_stat stat;
231 OM_uint32 maj_stat;
232
233 if (!kgss_gssd_handle)
234 return (GSS_S_FAILURE);
235
236 args.ctx = ctx->handle;
237 bzero(&res, sizeof(res));
238 stat = gssd_export_sec_context_1(&args, &res, kgss_gssd_handle);
239 if (stat != RPC_SUCCESS) {
240 return (GSS_S_FAILURE);
241 }
242
243 maj_stat = KGSS_IMPORT(ctx, res.format, &res.interprocess_token);
244 ctx->handle = 0;
245
246 xdr_free((xdrproc_t) xdr_export_sec_context_res, &res);
247
248 return (maj_stat);
249 }
250
251 void
252 kgss_copy_buffer(const gss_buffer_t from, gss_buffer_t to)
253 {
254 to->length = from->length;
255 if (from->length) {
256 to->value = malloc(from->length, M_GSSAPI, M_WAITOK);
257 bcopy(from->value, to->value, from->length);
258 } else {
259 to->value = NULL;
260 }
261 }
262
263 /*
264 * Acquire the kgss_gssd_handle and return it with a reference count,
265 * if it is available.
266 */
267 CLIENT *
268 kgss_gssd_client(void)
269 {
270 CLIENT *cl;
271
272 mtx_lock(&kgss_gssd_lock);
273 cl = kgss_gssd_handle;
274 if (cl != NULL)
275 CLNT_ACQUIRE(cl);
276 mtx_unlock(&kgss_gssd_lock);
277 return (cl);
278 }
279
280 /*
281 * Kernel module glue
282 */
283 static int
284 kgssapi_modevent(module_t mod, int type, void *data)
285 {
286 int error = 0;
287
288 switch (type) {
289 case MOD_LOAD:
290 rpc_gss_entries.rpc_gss_refresh_auth = rpc_gss_refresh_auth;
291 rpc_gss_entries.rpc_gss_secfind = rpc_gss_secfind;
292 rpc_gss_entries.rpc_gss_secpurge = rpc_gss_secpurge;
293 rpc_gss_entries.rpc_gss_seccreate = rpc_gss_seccreate;
294 rpc_gss_entries.rpc_gss_set_defaults = rpc_gss_set_defaults;
295 rpc_gss_entries.rpc_gss_max_data_length =
296 rpc_gss_max_data_length;
297 rpc_gss_entries.rpc_gss_get_error = rpc_gss_get_error;
298 rpc_gss_entries.rpc_gss_mech_to_oid = rpc_gss_mech_to_oid;
299 rpc_gss_entries.rpc_gss_oid_to_mech = rpc_gss_oid_to_mech;
300 rpc_gss_entries.rpc_gss_qop_to_num = rpc_gss_qop_to_num;
301 rpc_gss_entries.rpc_gss_get_mechanisms = rpc_gss_get_mechanisms;
302 rpc_gss_entries.rpc_gss_get_versions = rpc_gss_get_versions;
303 rpc_gss_entries.rpc_gss_is_installed = rpc_gss_is_installed;
304 rpc_gss_entries.rpc_gss_set_svc_name = rpc_gss_set_svc_name;
305 rpc_gss_entries.rpc_gss_clear_svc_name = rpc_gss_clear_svc_name;
306 rpc_gss_entries.rpc_gss_getcred = rpc_gss_getcred;
307 rpc_gss_entries.rpc_gss_set_callback = rpc_gss_set_callback;
308 rpc_gss_entries.rpc_gss_clear_callback = rpc_gss_clear_callback;
309 rpc_gss_entries.rpc_gss_get_principal_name =
310 rpc_gss_get_principal_name;
311 rpc_gss_entries.rpc_gss_svc_max_data_length =
312 rpc_gss_svc_max_data_length;
313 mtx_init(&kgss_gssd_lock, "kgss_gssd_lock", NULL, MTX_DEF);
314 error = kgss_load();
315 break;
316 case MOD_UNLOAD:
317 kgss_unload();
318 mtx_destroy(&kgss_gssd_lock);
319 /*
320 * Unloading of the kgssapi module is not currently supported.
321 * If somebody wants this, we would need to keep track of
322 * currently executing threads and make sure the count is 0.
323 */
324 /* FALLTHROUGH */
325 default:
326 error = EOPNOTSUPP;
327 }
328 return (error);
329 }
330 static moduledata_t kgssapi_mod = {
331 "kgssapi",
332 kgssapi_modevent,
333 NULL,
334 };
335 DECLARE_MODULE(kgssapi, kgssapi_mod, SI_SUB_VFS, SI_ORDER_ANY);
336 MODULE_DEPEND(kgssapi, krpc, 1, 1, 1);
337 MODULE_VERSION(kgssapi, 1);
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