blob: 3db745379d060a0d3e0a653636223e3d7d460ab4 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/module.h>
39#include <linux/sunrpc/msg_prot.h>
40#include <linux/sunrpc/gss_asn1.h>
41#include <linux/sunrpc/auth_gss.h>
42#include <linux/sunrpc/svcauth_gss.h>
43#include <linux/sunrpc/gss_err.h>
44#include <linux/sunrpc/sched.h>
45#include <linux/sunrpc/gss_api.h>
46#include <linux/sunrpc/clnt.h>
47
48#ifdef RPC_DEBUG
49# define RPCDBG_FACILITY RPCDBG_AUTH
50#endif
51
52static LIST_HEAD(registered_mechs);
53static DEFINE_SPINLOCK(registered_mechs_lock);
54
55static void
56gss_mech_free(struct gss_api_mech *gm)
57{
58 struct pf_desc *pf;
59 int i;
60
61 for (i = 0; i < gm->gm_pf_num; i++) {
62 pf = &gm->gm_pfs[i];
Jesper Juhla51482b2005-11-08 09:41:34 -080063 kfree(pf->auth_domain_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 pf->auth_domain_name = NULL;
65 }
66}
67
68static inline char *
69make_auth_domain_name(char *name)
70{
71 static char *prefix = "gss/";
72 char *new;
73
74 new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
75 if (new) {
76 strcpy(new, prefix);
77 strcat(new, name);
78 }
79 return new;
80}
81
82static int
83gss_mech_svc_setup(struct gss_api_mech *gm)
84{
85 struct pf_desc *pf;
86 int i, status;
87
88 for (i = 0; i < gm->gm_pf_num; i++) {
89 pf = &gm->gm_pfs[i];
90 pf->auth_domain_name = make_auth_domain_name(pf->name);
91 status = -ENOMEM;
92 if (pf->auth_domain_name == NULL)
93 goto out;
94 status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor,
95 pf->auth_domain_name);
96 if (status)
97 goto out;
98 }
99 return 0;
100out:
101 gss_mech_free(gm);
102 return status;
103}
104
105int
106gss_mech_register(struct gss_api_mech *gm)
107{
108 int status;
109
110 status = gss_mech_svc_setup(gm);
111 if (status)
112 return status;
113 spin_lock(&registered_mechs_lock);
114 list_add(&gm->gm_list, &registered_mechs);
115 spin_unlock(&registered_mechs_lock);
116 dprintk("RPC: registered gss mechanism %s\n", gm->gm_name);
117 return 0;
118}
119
120EXPORT_SYMBOL(gss_mech_register);
121
122void
123gss_mech_unregister(struct gss_api_mech *gm)
124{
125 spin_lock(&registered_mechs_lock);
126 list_del(&gm->gm_list);
127 spin_unlock(&registered_mechs_lock);
128 dprintk("RPC: unregistered gss mechanism %s\n", gm->gm_name);
129 gss_mech_free(gm);
130}
131
132EXPORT_SYMBOL(gss_mech_unregister);
133
134struct gss_api_mech *
135gss_mech_get(struct gss_api_mech *gm)
136{
137 __module_get(gm->gm_owner);
138 return gm;
139}
140
141EXPORT_SYMBOL(gss_mech_get);
142
143struct gss_api_mech *
144gss_mech_get_by_name(const char *name)
145{
146 struct gss_api_mech *pos, *gm = NULL;
147
148 spin_lock(&registered_mechs_lock);
149 list_for_each_entry(pos, &registered_mechs, gm_list) {
150 if (0 == strcmp(name, pos->gm_name)) {
151 if (try_module_get(pos->gm_owner))
152 gm = pos;
153 break;
154 }
155 }
156 spin_unlock(&registered_mechs_lock);
157 return gm;
158
159}
160
161EXPORT_SYMBOL(gss_mech_get_by_name);
162
163static inline int
164mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
165{
166 int i;
167
168 for (i = 0; i < gm->gm_pf_num; i++) {
169 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
170 return 1;
171 }
172 return 0;
173}
174
175struct gss_api_mech *
176gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
177{
178 struct gss_api_mech *pos, *gm = NULL;
179
180 spin_lock(&registered_mechs_lock);
181 list_for_each_entry(pos, &registered_mechs, gm_list) {
182 if (!mech_supports_pseudoflavor(pos, pseudoflavor)) {
183 module_put(pos->gm_owner);
184 continue;
185 }
186 if (try_module_get(pos->gm_owner))
187 gm = pos;
188 break;
189 }
190 spin_unlock(&registered_mechs_lock);
191 return gm;
192}
193
194EXPORT_SYMBOL(gss_mech_get_by_pseudoflavor);
195
196u32
197gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
198{
199 int i;
200
201 for (i = 0; i < gm->gm_pf_num; i++) {
202 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
203 return gm->gm_pfs[i].service;
204 }
205 return 0;
206}
207
208EXPORT_SYMBOL(gss_pseudoflavor_to_service);
209
210char *
211gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
212{
213 int i;
214
215 for (i = 0; i < gm->gm_pf_num; i++) {
216 if (gm->gm_pfs[i].service == service)
217 return gm->gm_pfs[i].auth_domain_name;
218 }
219 return NULL;
220}
221
222EXPORT_SYMBOL(gss_service_to_auth_domain_name);
223
224void
225gss_mech_put(struct gss_api_mech * gm)
226{
J. Bruce Fields1df0cad2006-06-30 01:56:16 -0700227 if (gm)
228 module_put(gm->gm_owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229}
230
231EXPORT_SYMBOL(gss_mech_put);
232
233/* The mech could probably be determined from the token instead, but it's just
234 * as easy for now to pass it in. */
235int
236gss_import_sec_context(const void *input_token, size_t bufsize,
237 struct gss_api_mech *mech,
238 struct gss_ctx **ctx_id)
239{
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700240 if (!(*ctx_id = kzalloc(sizeof(**ctx_id), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 return GSS_S_FAILURE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 (*ctx_id)->mech_type = gss_mech_get(mech);
243
244 return mech->gm_ops
245 ->gss_import_sec_context(input_token, bufsize, *ctx_id);
246}
247
248/* gss_get_mic: compute a mic over message and return mic_token. */
249
250u32
251gss_get_mic(struct gss_ctx *context_handle,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 struct xdr_buf *message,
253 struct xdr_netobj *mic_token)
254{
255 return context_handle->mech_type->gm_ops
256 ->gss_get_mic(context_handle,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 message,
258 mic_token);
259}
260
261/* gss_verify_mic: check whether the provided mic_token verifies message. */
262
263u32
264gss_verify_mic(struct gss_ctx *context_handle,
265 struct xdr_buf *message,
J. Bruce Fields00fd6e12005-10-13 16:55:18 -0400266 struct xdr_netobj *mic_token)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
268 return context_handle->mech_type->gm_ops
269 ->gss_verify_mic(context_handle,
270 message,
J. Bruce Fields00fd6e12005-10-13 16:55:18 -0400271 mic_token);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272}
273
J. Bruce Fields293f1eb2005-10-13 16:54:37 -0400274u32
275gss_wrap(struct gss_ctx *ctx_id,
J. Bruce Fields293f1eb2005-10-13 16:54:37 -0400276 int offset,
277 struct xdr_buf *buf,
278 struct page **inpages)
279{
280 return ctx_id->mech_type->gm_ops
J. Bruce Fields00fd6e12005-10-13 16:55:18 -0400281 ->gss_wrap(ctx_id, offset, buf, inpages);
J. Bruce Fields293f1eb2005-10-13 16:54:37 -0400282}
283
284u32
285gss_unwrap(struct gss_ctx *ctx_id,
J. Bruce Fields293f1eb2005-10-13 16:54:37 -0400286 int offset,
287 struct xdr_buf *buf)
288{
289 return ctx_id->mech_type->gm_ops
J. Bruce Fields00fd6e12005-10-13 16:55:18 -0400290 ->gss_unwrap(ctx_id, offset, buf);
J. Bruce Fields293f1eb2005-10-13 16:54:37 -0400291}
292
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294/* gss_delete_sec_context: free all resources associated with context_handle.
295 * Note this differs from the RFC 2744-specified prototype in that we don't
296 * bother returning an output token, since it would never be used anyway. */
297
298u32
299gss_delete_sec_context(struct gss_ctx **context_handle)
300{
301 dprintk("RPC: gss_delete_sec_context deleting %p\n",
302 *context_handle);
303
304 if (!*context_handle)
305 return(GSS_S_NO_CONTEXT);
306 if ((*context_handle)->internal_ctx_id != 0)
307 (*context_handle)->mech_type->gm_ops
308 ->gss_delete_sec_context((*context_handle)
309 ->internal_ctx_id);
J. Bruce Fields1df0cad2006-06-30 01:56:16 -0700310 gss_mech_put((*context_handle)->mech_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 kfree(*context_handle);
312 *context_handle=NULL;
313 return GSS_S_COMPLETE;
314}