nfsd: don't fail unchecked creates of non-special files
[zen-stable.git] / net / sunrpc / auth_gss / gss_mech_switch.c
blobca8cad8251c7ff1c13c9bff6757e098c4f1cd9b2
1 /*
2 * linux/net/sunrpc/gss_mech_switch.c
4 * Copyright (c) 2001 The Regents of the University of Michigan.
5 * All rights reserved.
7 * J. Bruce Fields <bfields@umich.edu>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
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.
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.
36 #include <linux/types.h>
37 #include <linux/slab.h>
38 #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>
48 #ifdef RPC_DEBUG
49 # define RPCDBG_FACILITY RPCDBG_AUTH
50 #endif
52 static LIST_HEAD(registered_mechs);
53 static DEFINE_SPINLOCK(registered_mechs_lock);
55 static void
56 gss_mech_free(struct gss_api_mech *gm)
58 struct pf_desc *pf;
59 int i;
61 for (i = 0; i < gm->gm_pf_num; i++) {
62 pf = &gm->gm_pfs[i];
63 kfree(pf->auth_domain_name);
64 pf->auth_domain_name = NULL;
68 static inline char *
69 make_auth_domain_name(char *name)
71 static char *prefix = "gss/";
72 char *new;
74 new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
75 if (new) {
76 strcpy(new, prefix);
77 strcat(new, name);
79 return new;
82 static int
83 gss_mech_svc_setup(struct gss_api_mech *gm)
85 struct pf_desc *pf;
86 int i, status;
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;
99 return 0;
100 out:
101 gss_mech_free(gm);
102 return status;
106 gss_mech_register(struct gss_api_mech *gm)
108 int status;
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;
120 EXPORT_SYMBOL_GPL(gss_mech_register);
122 void
123 gss_mech_unregister(struct gss_api_mech *gm)
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);
132 EXPORT_SYMBOL_GPL(gss_mech_unregister);
134 struct gss_api_mech *
135 gss_mech_get(struct gss_api_mech *gm)
137 __module_get(gm->gm_owner);
138 return gm;
141 EXPORT_SYMBOL_GPL(gss_mech_get);
143 struct gss_api_mech *
144 _gss_mech_get_by_name(const char *name)
146 struct gss_api_mech *pos, *gm = NULL;
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;
156 spin_unlock(&registered_mechs_lock);
157 return gm;
161 struct gss_api_mech * gss_mech_get_by_name(const char *name)
163 struct gss_api_mech *gm = NULL;
165 gm = _gss_mech_get_by_name(name);
166 if (!gm) {
167 request_module("rpc-auth-gss-%s", name);
168 gm = _gss_mech_get_by_name(name);
170 return gm;
172 EXPORT_SYMBOL_GPL(gss_mech_get_by_name);
174 struct gss_api_mech *
175 gss_mech_get_by_OID(struct xdr_netobj *obj)
177 struct gss_api_mech *pos, *gm = NULL;
179 spin_lock(&registered_mechs_lock);
180 list_for_each_entry(pos, &registered_mechs, gm_list) {
181 if (obj->len == pos->gm_oid.len) {
182 if (0 == memcmp(obj->data, pos->gm_oid.data, obj->len)) {
183 if (try_module_get(pos->gm_owner))
184 gm = pos;
185 break;
189 spin_unlock(&registered_mechs_lock);
190 return gm;
194 EXPORT_SYMBOL_GPL(gss_mech_get_by_OID);
196 static inline int
197 mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
199 int i;
201 for (i = 0; i < gm->gm_pf_num; i++) {
202 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
203 return 1;
205 return 0;
208 struct gss_api_mech *_gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
210 struct gss_api_mech *gm = NULL, *pos;
212 spin_lock(&registered_mechs_lock);
213 list_for_each_entry(pos, &registered_mechs, gm_list) {
214 if (!mech_supports_pseudoflavor(pos, pseudoflavor)) {
215 module_put(pos->gm_owner);
216 continue;
218 if (try_module_get(pos->gm_owner))
219 gm = pos;
220 break;
222 spin_unlock(&registered_mechs_lock);
223 return gm;
226 struct gss_api_mech *
227 gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
229 struct gss_api_mech *gm;
231 gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
233 if (!gm) {
234 request_module("rpc-auth-gss-%u", pseudoflavor);
235 gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
237 return gm;
240 EXPORT_SYMBOL_GPL(gss_mech_get_by_pseudoflavor);
242 int gss_mech_list_pseudoflavors(rpc_authflavor_t *array_ptr)
244 struct gss_api_mech *pos = NULL;
245 int i = 0;
247 spin_lock(&registered_mechs_lock);
248 list_for_each_entry(pos, &registered_mechs, gm_list) {
249 array_ptr[i] = pos->gm_pfs->pseudoflavor;
250 i++;
252 spin_unlock(&registered_mechs_lock);
253 return i;
256 EXPORT_SYMBOL_GPL(gss_mech_list_pseudoflavors);
259 gss_svc_to_pseudoflavor(struct gss_api_mech *gm, u32 service)
261 int i;
263 for (i = 0; i < gm->gm_pf_num; i++) {
264 if (gm->gm_pfs[i].service == service) {
265 return gm->gm_pfs[i].pseudoflavor;
268 return RPC_AUTH_MAXFLAVOR; /* illegal value */
270 EXPORT_SYMBOL_GPL(gss_svc_to_pseudoflavor);
273 gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
275 int i;
277 for (i = 0; i < gm->gm_pf_num; i++) {
278 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
279 return gm->gm_pfs[i].service;
281 return 0;
284 EXPORT_SYMBOL_GPL(gss_pseudoflavor_to_service);
286 char *
287 gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
289 int i;
291 for (i = 0; i < gm->gm_pf_num; i++) {
292 if (gm->gm_pfs[i].service == service)
293 return gm->gm_pfs[i].auth_domain_name;
295 return NULL;
298 EXPORT_SYMBOL_GPL(gss_service_to_auth_domain_name);
300 void
301 gss_mech_put(struct gss_api_mech * gm)
303 if (gm)
304 module_put(gm->gm_owner);
307 EXPORT_SYMBOL_GPL(gss_mech_put);
309 /* The mech could probably be determined from the token instead, but it's just
310 * as easy for now to pass it in. */
312 gss_import_sec_context(const void *input_token, size_t bufsize,
313 struct gss_api_mech *mech,
314 struct gss_ctx **ctx_id,
315 gfp_t gfp_mask)
317 if (!(*ctx_id = kzalloc(sizeof(**ctx_id), gfp_mask)))
318 return -ENOMEM;
319 (*ctx_id)->mech_type = gss_mech_get(mech);
321 return mech->gm_ops
322 ->gss_import_sec_context(input_token, bufsize, *ctx_id, gfp_mask);
325 /* gss_get_mic: compute a mic over message and return mic_token. */
328 gss_get_mic(struct gss_ctx *context_handle,
329 struct xdr_buf *message,
330 struct xdr_netobj *mic_token)
332 return context_handle->mech_type->gm_ops
333 ->gss_get_mic(context_handle,
334 message,
335 mic_token);
338 /* gss_verify_mic: check whether the provided mic_token verifies message. */
341 gss_verify_mic(struct gss_ctx *context_handle,
342 struct xdr_buf *message,
343 struct xdr_netobj *mic_token)
345 return context_handle->mech_type->gm_ops
346 ->gss_verify_mic(context_handle,
347 message,
348 mic_token);
352 * This function is called from both the client and server code.
353 * Each makes guarantees about how much "slack" space is available
354 * for the underlying function in "buf"'s head and tail while
355 * performing the wrap.
357 * The client and server code allocate RPC_MAX_AUTH_SIZE extra
358 * space in both the head and tail which is available for use by
359 * the wrap function.
361 * Underlying functions should verify they do not use more than
362 * RPC_MAX_AUTH_SIZE of extra space in either the head or tail
363 * when performing the wrap.
366 gss_wrap(struct gss_ctx *ctx_id,
367 int offset,
368 struct xdr_buf *buf,
369 struct page **inpages)
371 return ctx_id->mech_type->gm_ops
372 ->gss_wrap(ctx_id, offset, buf, inpages);
376 gss_unwrap(struct gss_ctx *ctx_id,
377 int offset,
378 struct xdr_buf *buf)
380 return ctx_id->mech_type->gm_ops
381 ->gss_unwrap(ctx_id, offset, buf);
385 /* gss_delete_sec_context: free all resources associated with context_handle.
386 * Note this differs from the RFC 2744-specified prototype in that we don't
387 * bother returning an output token, since it would never be used anyway. */
390 gss_delete_sec_context(struct gss_ctx **context_handle)
392 dprintk("RPC: gss_delete_sec_context deleting %p\n",
393 *context_handle);
395 if (!*context_handle)
396 return GSS_S_NO_CONTEXT;
397 if ((*context_handle)->internal_ctx_id)
398 (*context_handle)->mech_type->gm_ops
399 ->gss_delete_sec_context((*context_handle)
400 ->internal_ctx_id);
401 gss_mech_put((*context_handle)->mech_type);
402 kfree(*context_handle);
403 *context_handle=NULL;
404 return GSS_S_COMPLETE;