blob: 9dfb68377d694818beabf3983d3e19a891bf020e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/net/sunrpc/gss_mech_switch.c
3 *
4 * Copyright (c) 2001 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * J. Bruce Fields <bfields@umich.edu>
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 */
35
36#include <linux/types.h>
37#include <linux/slab.h>
38#include <linux/socket.h>
39#include <linux/module.h>
40#include <linux/sunrpc/msg_prot.h>
41#include <linux/sunrpc/gss_asn1.h>
42#include <linux/sunrpc/auth_gss.h>
43#include <linux/sunrpc/svcauth_gss.h>
44#include <linux/sunrpc/gss_err.h>
45#include <linux/sunrpc/sched.h>
46#include <linux/sunrpc/gss_api.h>
47#include <linux/sunrpc/clnt.h>
48
49#ifdef RPC_DEBUG
50# define RPCDBG_FACILITY RPCDBG_AUTH
51#endif
52
53static LIST_HEAD(registered_mechs);
54static DEFINE_SPINLOCK(registered_mechs_lock);
55
56static void
57gss_mech_free(struct gss_api_mech *gm)
58{
59 struct pf_desc *pf;
60 int i;
61
62 for (i = 0; i < gm->gm_pf_num; i++) {
63 pf = &gm->gm_pfs[i];
64 if (pf->auth_domain_name)
65 kfree(pf->auth_domain_name);
66 pf->auth_domain_name = NULL;
67 }
68}
69
70static inline char *
71make_auth_domain_name(char *name)
72{
73 static char *prefix = "gss/";
74 char *new;
75
76 new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
77 if (new) {
78 strcpy(new, prefix);
79 strcat(new, name);
80 }
81 return new;
82}
83
84static int
85gss_mech_svc_setup(struct gss_api_mech *gm)
86{
87 struct pf_desc *pf;
88 int i, status;
89
90 for (i = 0; i < gm->gm_pf_num; i++) {
91 pf = &gm->gm_pfs[i];
92 pf->auth_domain_name = make_auth_domain_name(pf->name);
93 status = -ENOMEM;
94 if (pf->auth_domain_name == NULL)
95 goto out;
96 status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor,
97 pf->auth_domain_name);
98 if (status)
99 goto out;
100 }
101 return 0;
102out:
103 gss_mech_free(gm);
104 return status;
105}
106
107int
108gss_mech_register(struct gss_api_mech *gm)
109{
110 int status;
111
112 status = gss_mech_svc_setup(gm);
113 if (status)
114 return status;
115 spin_lock(&registered_mechs_lock);
116 list_add(&gm->gm_list, &registered_mechs);
117 spin_unlock(&registered_mechs_lock);
118 dprintk("RPC: registered gss mechanism %s\n", gm->gm_name);
119 return 0;
120}
121
122EXPORT_SYMBOL(gss_mech_register);
123
124void
125gss_mech_unregister(struct gss_api_mech *gm)
126{
127 spin_lock(&registered_mechs_lock);
128 list_del(&gm->gm_list);
129 spin_unlock(&registered_mechs_lock);
130 dprintk("RPC: unregistered gss mechanism %s\n", gm->gm_name);
131 gss_mech_free(gm);
132}
133
134EXPORT_SYMBOL(gss_mech_unregister);
135
136struct gss_api_mech *
137gss_mech_get(struct gss_api_mech *gm)
138{
139 __module_get(gm->gm_owner);
140 return gm;
141}
142
143EXPORT_SYMBOL(gss_mech_get);
144
145struct gss_api_mech *
146gss_mech_get_by_name(const char *name)
147{
148 struct gss_api_mech *pos, *gm = NULL;
149
150 spin_lock(&registered_mechs_lock);
151 list_for_each_entry(pos, &registered_mechs, gm_list) {
152 if (0 == strcmp(name, pos->gm_name)) {
153 if (try_module_get(pos->gm_owner))
154 gm = pos;
155 break;
156 }
157 }
158 spin_unlock(&registered_mechs_lock);
159 return gm;
160
161}
162
163EXPORT_SYMBOL(gss_mech_get_by_name);
164
165static inline int
166mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
167{
168 int i;
169
170 for (i = 0; i < gm->gm_pf_num; i++) {
171 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
172 return 1;
173 }
174 return 0;
175}
176
177struct gss_api_mech *
178gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
179{
180 struct gss_api_mech *pos, *gm = NULL;
181
182 spin_lock(&registered_mechs_lock);
183 list_for_each_entry(pos, &registered_mechs, gm_list) {
184 if (!mech_supports_pseudoflavor(pos, pseudoflavor)) {
185 module_put(pos->gm_owner);
186 continue;
187 }
188 if (try_module_get(pos->gm_owner))
189 gm = pos;
190 break;
191 }
192 spin_unlock(&registered_mechs_lock);
193 return gm;
194}
195
196EXPORT_SYMBOL(gss_mech_get_by_pseudoflavor);
197
198u32
199gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
200{
201 int i;
202
203 for (i = 0; i < gm->gm_pf_num; i++) {
204 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
205 return gm->gm_pfs[i].service;
206 }
207 return 0;
208}
209
210EXPORT_SYMBOL(gss_pseudoflavor_to_service);
211
212char *
213gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
214{
215 int i;
216
217 for (i = 0; i < gm->gm_pf_num; i++) {
218 if (gm->gm_pfs[i].service == service)
219 return gm->gm_pfs[i].auth_domain_name;
220 }
221 return NULL;
222}
223
224EXPORT_SYMBOL(gss_service_to_auth_domain_name);
225
226void
227gss_mech_put(struct gss_api_mech * gm)
228{
229 module_put(gm->gm_owner);
230}
231
232EXPORT_SYMBOL(gss_mech_put);
233
234/* The mech could probably be determined from the token instead, but it's just
235 * as easy for now to pass it in. */
236int
237gss_import_sec_context(const void *input_token, size_t bufsize,
238 struct gss_api_mech *mech,
239 struct gss_ctx **ctx_id)
240{
241 if (!(*ctx_id = kmalloc(sizeof(**ctx_id), GFP_KERNEL)))
242 return GSS_S_FAILURE;
243 memset(*ctx_id, 0, sizeof(**ctx_id));
244 (*ctx_id)->mech_type = gss_mech_get(mech);
245
246 return mech->gm_ops
247 ->gss_import_sec_context(input_token, bufsize, *ctx_id);
248}
249
250/* gss_get_mic: compute a mic over message and return mic_token. */
251
252u32
253gss_get_mic(struct gss_ctx *context_handle,
254 u32 qop,
255 struct xdr_buf *message,
256 struct xdr_netobj *mic_token)
257{
258 return context_handle->mech_type->gm_ops
259 ->gss_get_mic(context_handle,
260 qop,
261 message,
262 mic_token);
263}
264
265/* gss_verify_mic: check whether the provided mic_token verifies message. */
266
267u32
268gss_verify_mic(struct gss_ctx *context_handle,
269 struct xdr_buf *message,
270 struct xdr_netobj *mic_token,
271 u32 *qstate)
272{
273 return context_handle->mech_type->gm_ops
274 ->gss_verify_mic(context_handle,
275 message,
276 mic_token,
277 qstate);
278}
279
280/* gss_delete_sec_context: free all resources associated with context_handle.
281 * Note this differs from the RFC 2744-specified prototype in that we don't
282 * bother returning an output token, since it would never be used anyway. */
283
284u32
285gss_delete_sec_context(struct gss_ctx **context_handle)
286{
287 dprintk("RPC: gss_delete_sec_context deleting %p\n",
288 *context_handle);
289
290 if (!*context_handle)
291 return(GSS_S_NO_CONTEXT);
292 if ((*context_handle)->internal_ctx_id != 0)
293 (*context_handle)->mech_type->gm_ops
294 ->gss_delete_sec_context((*context_handle)
295 ->internal_ctx_id);
296 if ((*context_handle)->mech_type)
297 gss_mech_put((*context_handle)->mech_type);
298 kfree(*context_handle);
299 *context_handle=NULL;
300 return GSS_S_COMPLETE;
301}