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/8.3/sys/kgssapi/gss_impl.c 224850 2011-08-13 17:20:00Z zack $");
30
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/kobj.h>
34 #include <sys/malloc.h>
35 #include <sys/module.h>
36 #include <sys/priv.h>
37 #include <sys/syscall.h>
38 #include <sys/sysent.h>
39 #include <sys/sysproto.h>
40
41 #include <kgssapi/gssapi.h>
42 #include <kgssapi/gssapi_impl.h>
43 #include <rpc/rpc.h>
44 #include <rpc/rpc_com.h>
45 #include <rpc/rpcsec_gss.h>
46
47 #include "gssd.h"
48 #include "kgss_if.h"
49
50 MALLOC_DEFINE(M_GSSAPI, "GSS-API", "GSS-API");
51
52 /*
53 * Syscall hooks
54 */
55 static int gssd_syscall_offset = SYS_gssd_syscall;
56 static struct sysent gssd_syscall_prev_sysent;
57 MAKE_SYSENT(gssd_syscall);
58 static bool_t gssd_syscall_registered = FALSE;
59
60 struct kgss_mech_list kgss_mechs;
61 CLIENT *kgss_gssd_handle;
62
63 static void
64 kgss_init(void *dummy)
65 {
66 int error;
67
68 LIST_INIT(&kgss_mechs);
69 error = syscall_register(&gssd_syscall_offset, &gssd_syscall_sysent,
70 &gssd_syscall_prev_sysent);
71 if (error)
72 printf("Can't register GSSD syscall\n");
73 else
74 gssd_syscall_registered = TRUE;
75 }
76 SYSINIT(kgss_init, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_init, NULL);
77
78 static void
79 kgss_uninit(void *dummy)
80 {
81
82 if (gssd_syscall_registered)
83 syscall_deregister(&gssd_syscall_offset,
84 &gssd_syscall_prev_sysent);
85 }
86 SYSUNINIT(kgss_uninit, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_uninit, NULL);
87
88 int
89 gssd_syscall(struct thread *td, struct gssd_syscall_args *uap)
90 {
91 struct sockaddr_un sun;
92 struct netconfig *nconf;
93 char path[MAXPATHLEN];
94 int error;
95
96 error = priv_check(td, PRIV_NFS_DAEMON);
97 if (error)
98 return (error);
99
100 if (kgss_gssd_handle)
101 CLNT_DESTROY(kgss_gssd_handle);
102
103 error = copyinstr(uap->path, path, sizeof(path), NULL);
104 if (error)
105 return (error);
106
107 sun.sun_family = AF_LOCAL;
108 strcpy(sun.sun_path, path);
109 sun.sun_len = SUN_LEN(&sun);
110
111 nconf = getnetconfigent("local");
112 kgss_gssd_handle = clnt_reconnect_create(nconf,
113 (struct sockaddr *) &sun, GSSD, GSSDVERS,
114 RPC_MAXDATASIZE, RPC_MAXDATASIZE);
115
116 return (0);
117 }
118
119 int
120 kgss_oid_equal(const gss_OID oid1, const gss_OID oid2)
121 {
122
123 if (oid1 == oid2)
124 return (1);
125 if (!oid1 || !oid2)
126 return (0);
127 if (oid1->length != oid2->length)
128 return (0);
129 if (memcmp(oid1->elements, oid2->elements, oid1->length))
130 return (0);
131 return (1);
132 }
133
134 void
135 kgss_install_mech(gss_OID mech_type, const char *name, struct kobj_class *cls)
136 {
137 struct kgss_mech *km;
138
139 km = malloc(sizeof(struct kgss_mech), M_GSSAPI, M_WAITOK);
140 km->km_mech_type = mech_type;
141 km->km_mech_name = name;
142 km->km_class = cls;
143 LIST_INSERT_HEAD(&kgss_mechs, km, km_link);
144 }
145
146 void
147 kgss_uninstall_mech(gss_OID mech_type)
148 {
149 struct kgss_mech *km;
150
151 LIST_FOREACH(km, &kgss_mechs, km_link) {
152 if (kgss_oid_equal(km->km_mech_type, mech_type)) {
153 LIST_REMOVE(km, km_link);
154 free(km, M_GSSAPI);
155 return;
156 }
157 }
158 }
159
160 gss_OID
161 kgss_find_mech_by_name(const char *name)
162 {
163 struct kgss_mech *km;
164
165 LIST_FOREACH(km, &kgss_mechs, km_link) {
166 if (!strcmp(km->km_mech_name, name)) {
167 return (km->km_mech_type);
168 }
169 }
170 return (GSS_C_NO_OID);
171 }
172
173 const char *
174 kgss_find_mech_by_oid(const gss_OID oid)
175 {
176 struct kgss_mech *km;
177
178 LIST_FOREACH(km, &kgss_mechs, km_link) {
179 if (kgss_oid_equal(km->km_mech_type, oid)) {
180 return (km->km_mech_name);
181 }
182 }
183 return (NULL);
184 }
185
186 gss_ctx_id_t
187 kgss_create_context(gss_OID mech_type)
188 {
189 struct kgss_mech *km;
190 gss_ctx_id_t ctx;
191
192 LIST_FOREACH(km, &kgss_mechs, km_link) {
193 if (kgss_oid_equal(km->km_mech_type, mech_type))
194 break;
195 }
196 if (!km)
197 return (NULL);
198
199 ctx = (gss_ctx_id_t) kobj_create(km->km_class, M_GSSAPI, M_WAITOK);
200 KGSS_INIT(ctx);
201
202 return (ctx);
203 }
204
205 void
206 kgss_delete_context(gss_ctx_id_t ctx, gss_buffer_t output_token)
207 {
208
209 KGSS_DELETE(ctx, output_token);
210 kobj_delete((kobj_t) ctx, M_GSSAPI);
211 }
212
213 OM_uint32
214 kgss_transfer_context(gss_ctx_id_t ctx)
215 {
216 struct export_sec_context_res res;
217 struct export_sec_context_args args;
218 enum clnt_stat stat;
219 OM_uint32 maj_stat;
220
221 if (!kgss_gssd_handle)
222 return (GSS_S_FAILURE);
223
224 args.ctx = ctx->handle;
225 bzero(&res, sizeof(res));
226 stat = gssd_export_sec_context_1(&args, &res, kgss_gssd_handle);
227 if (stat != RPC_SUCCESS) {
228 return (GSS_S_FAILURE);
229 }
230
231 maj_stat = KGSS_IMPORT(ctx, res.format, &res.interprocess_token);
232 ctx->handle = 0;
233
234 xdr_free((xdrproc_t) xdr_export_sec_context_res, &res);
235
236 return (maj_stat);
237 }
238
239 void
240 kgss_copy_buffer(const gss_buffer_t from, gss_buffer_t to)
241 {
242 to->length = from->length;
243 if (from->length) {
244 to->value = malloc(from->length, M_GSSAPI, M_WAITOK);
245 bcopy(from->value, to->value, from->length);
246 } else {
247 to->value = NULL;
248 }
249 }
250
251 /*
252 * Kernel module glue
253 */
254 static int
255 kgssapi_modevent(module_t mod, int type, void *data)
256 {
257 int error = 0;
258
259 switch (type) {
260 case MOD_LOAD:
261 rpc_gss_entries.rpc_gss_secfind = rpc_gss_secfind;
262 rpc_gss_entries.rpc_gss_secpurge = rpc_gss_secpurge;
263 rpc_gss_entries.rpc_gss_seccreate = rpc_gss_seccreate;
264 rpc_gss_entries.rpc_gss_set_defaults = rpc_gss_set_defaults;
265 rpc_gss_entries.rpc_gss_max_data_length =
266 rpc_gss_max_data_length;
267 rpc_gss_entries.rpc_gss_get_error = rpc_gss_get_error;
268 rpc_gss_entries.rpc_gss_mech_to_oid = rpc_gss_mech_to_oid;
269 rpc_gss_entries.rpc_gss_oid_to_mech = rpc_gss_oid_to_mech;
270 rpc_gss_entries.rpc_gss_qop_to_num = rpc_gss_qop_to_num;
271 rpc_gss_entries.rpc_gss_get_mechanisms = rpc_gss_get_mechanisms;
272 rpc_gss_entries.rpc_gss_get_versions = rpc_gss_get_versions;
273 rpc_gss_entries.rpc_gss_is_installed = rpc_gss_is_installed;
274 rpc_gss_entries.rpc_gss_set_svc_name = rpc_gss_set_svc_name;
275 rpc_gss_entries.rpc_gss_clear_svc_name = rpc_gss_clear_svc_name;
276 rpc_gss_entries.rpc_gss_getcred = rpc_gss_getcred;
277 rpc_gss_entries.rpc_gss_set_callback = rpc_gss_set_callback;
278 rpc_gss_entries.rpc_gss_clear_callback = rpc_gss_clear_callback;
279 rpc_gss_entries.rpc_gss_get_principal_name =
280 rpc_gss_get_principal_name;
281 rpc_gss_entries.rpc_gss_svc_max_data_length =
282 rpc_gss_svc_max_data_length;
283 break;
284 case MOD_UNLOAD:
285 /*
286 * Unloading of the kgssapi module is not currently supported.
287 * If somebody wants this, we would need to keep track of
288 * currently executing threads and make sure the count is 0.
289 */
290 /* FALLTHROUGH */
291 default:
292 error = EOPNOTSUPP;
293 };
294 return (error);
295 }
296 static moduledata_t kgssapi_mod = {
297 "kgssapi",
298 kgssapi_modevent,
299 NULL,
300 };
301 DECLARE_MODULE(kgssapi, kgssapi_mod, SI_SUB_VFS, SI_ORDER_ANY);
302 MODULE_DEPEND(kgssapi, krpc, 1, 1, 1);
303 MODULE_VERSION(kgssapi, 1);
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