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Linux/net/sunrpc/auth_gss/gss_mech_switch.c

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  1 /*
  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/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 
 52 static LIST_HEAD(registered_mechs);
 53 static DEFINE_SPINLOCK(registered_mechs_lock);
 54 
 55 static void
 56 gss_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];
 63                 kfree(pf->auth_domain_name);
 64                 pf->auth_domain_name = NULL;
 65         }
 66 }
 67 
 68 static inline char *
 69 make_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 
 82 static int
 83 gss_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;
100 out:
101         gss_mech_free(gm);
102         return status;
103 }
104 
105 int
106 gss_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 
120 EXPORT_SYMBOL_GPL(gss_mech_register);
121 
122 void
123 gss_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 
132 EXPORT_SYMBOL_GPL(gss_mech_unregister);
133 
134 struct gss_api_mech *
135 gss_mech_get(struct gss_api_mech *gm)
136 {
137         __module_get(gm->gm_owner);
138         return gm;
139 }
140 
141 EXPORT_SYMBOL_GPL(gss_mech_get);
142 
143 struct gss_api_mech *
144 _gss_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 
161 struct gss_api_mech * gss_mech_get_by_name(const char *name)
162 {
163         struct gss_api_mech *gm = NULL;
164 
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);
169         }
170         return gm;
171 }
172 EXPORT_SYMBOL_GPL(gss_mech_get_by_name);
173 
174 struct gss_api_mech *
175 gss_mech_get_by_OID(struct xdr_netobj *obj)
176 {
177         struct gss_api_mech     *pos, *gm = NULL;
178 
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;
186                         }
187                 }
188         }
189         spin_unlock(&registered_mechs_lock);
190         return gm;
191 
192 }
193 
194 EXPORT_SYMBOL_GPL(gss_mech_get_by_OID);
195 
196 static inline int
197 mech_supports_pseudoflavor(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 1;
204         }
205         return 0;
206 }
207 
208 struct gss_api_mech *_gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
209 {
210         struct gss_api_mech *gm = NULL, *pos;
211 
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;
217                 }
218                 if (try_module_get(pos->gm_owner))
219                         gm = pos;
220                 break;
221         }
222         spin_unlock(&registered_mechs_lock);
223         return gm;
224 }
225 
226 struct gss_api_mech *
227 gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
228 {
229         struct gss_api_mech *gm;
230 
231         gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
232 
233         if (!gm) {
234                 request_module("rpc-auth-gss-%u", pseudoflavor);
235                 gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
236         }
237         return gm;
238 }
239 
240 EXPORT_SYMBOL_GPL(gss_mech_get_by_pseudoflavor);
241 
242 int gss_mech_list_pseudoflavors(rpc_authflavor_t *array_ptr)
243 {
244         struct gss_api_mech *pos = NULL;
245         int j, i = 0;
246 
247         spin_lock(&registered_mechs_lock);
248         list_for_each_entry(pos, &registered_mechs, gm_list) {
249                 for (j=0; j < pos->gm_pf_num; j++) {
250                         array_ptr[i++] = pos->gm_pfs[j].pseudoflavor;
251                 }
252         }
253         spin_unlock(&registered_mechs_lock);
254         return i;
255 }
256 
257 EXPORT_SYMBOL_GPL(gss_mech_list_pseudoflavors);
258 
259 u32
260 gss_svc_to_pseudoflavor(struct gss_api_mech *gm, u32 service)
261 {
262         int i;
263 
264         for (i = 0; i < gm->gm_pf_num; i++) {
265                 if (gm->gm_pfs[i].service == service) {
266                         return gm->gm_pfs[i].pseudoflavor;
267                 }
268         }
269         return RPC_AUTH_MAXFLAVOR; /* illegal value */
270 }
271 EXPORT_SYMBOL_GPL(gss_svc_to_pseudoflavor);
272 
273 u32
274 gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
275 {
276         int i;
277 
278         for (i = 0; i < gm->gm_pf_num; i++) {
279                 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
280                         return gm->gm_pfs[i].service;
281         }
282         return 0;
283 }
284 
285 EXPORT_SYMBOL_GPL(gss_pseudoflavor_to_service);
286 
287 char *
288 gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
289 {
290         int i;
291 
292         for (i = 0; i < gm->gm_pf_num; i++) {
293                 if (gm->gm_pfs[i].service == service)
294                         return gm->gm_pfs[i].auth_domain_name;
295         }
296         return NULL;
297 }
298 
299 EXPORT_SYMBOL_GPL(gss_service_to_auth_domain_name);
300 
301 void
302 gss_mech_put(struct gss_api_mech * gm)
303 {
304         if (gm)
305                 module_put(gm->gm_owner);
306 }
307 
308 EXPORT_SYMBOL_GPL(gss_mech_put);
309 
310 /* The mech could probably be determined from the token instead, but it's just
311  * as easy for now to pass it in. */
312 int
313 gss_import_sec_context(const void *input_token, size_t bufsize,
314                        struct gss_api_mech      *mech,
315                        struct gss_ctx           **ctx_id,
316                        gfp_t gfp_mask)
317 {
318         if (!(*ctx_id = kzalloc(sizeof(**ctx_id), gfp_mask)))
319                 return -ENOMEM;
320         (*ctx_id)->mech_type = gss_mech_get(mech);
321 
322         return mech->gm_ops
323                 ->gss_import_sec_context(input_token, bufsize, *ctx_id, gfp_mask);
324 }
325 
326 /* gss_get_mic: compute a mic over message and return mic_token. */
327 
328 u32
329 gss_get_mic(struct gss_ctx      *context_handle,
330             struct xdr_buf      *message,
331             struct xdr_netobj   *mic_token)
332 {
333          return context_handle->mech_type->gm_ops
334                 ->gss_get_mic(context_handle,
335                               message,
336                               mic_token);
337 }
338 
339 /* gss_verify_mic: check whether the provided mic_token verifies message. */
340 
341 u32
342 gss_verify_mic(struct gss_ctx           *context_handle,
343                struct xdr_buf           *message,
344                struct xdr_netobj        *mic_token)
345 {
346         return context_handle->mech_type->gm_ops
347                 ->gss_verify_mic(context_handle,
348                                  message,
349                                  mic_token);
350 }
351 
352 /*
353  * This function is called from both the client and server code.
354  * Each makes guarantees about how much "slack" space is available
355  * for the underlying function in "buf"'s head and tail while
356  * performing the wrap.
357  *
358  * The client and server code allocate RPC_MAX_AUTH_SIZE extra
359  * space in both the head and tail which is available for use by
360  * the wrap function.
361  *
362  * Underlying functions should verify they do not use more than
363  * RPC_MAX_AUTH_SIZE of extra space in either the head or tail
364  * when performing the wrap.
365  */
366 u32
367 gss_wrap(struct gss_ctx *ctx_id,
368          int            offset,
369          struct xdr_buf *buf,
370          struct page    **inpages)
371 {
372         return ctx_id->mech_type->gm_ops
373                 ->gss_wrap(ctx_id, offset, buf, inpages);
374 }
375 
376 u32
377 gss_unwrap(struct gss_ctx       *ctx_id,
378            int                  offset,
379            struct xdr_buf       *buf)
380 {
381         return ctx_id->mech_type->gm_ops
382                 ->gss_unwrap(ctx_id, offset, buf);
383 }
384 
385 
386 /* gss_delete_sec_context: free all resources associated with context_handle.
387  * Note this differs from the RFC 2744-specified prototype in that we don't
388  * bother returning an output token, since it would never be used anyway. */
389 
390 u32
391 gss_delete_sec_context(struct gss_ctx   **context_handle)
392 {
393         dprintk("RPC:       gss_delete_sec_context deleting %p\n",
394                         *context_handle);
395 
396         if (!*context_handle)
397                 return GSS_S_NO_CONTEXT;
398         if ((*context_handle)->internal_ctx_id)
399                 (*context_handle)->mech_type->gm_ops
400                         ->gss_delete_sec_context((*context_handle)
401                                                         ->internal_ctx_id);
402         gss_mech_put((*context_handle)->mech_type);
403         kfree(*context_handle);
404         *context_handle=NULL;
405         return GSS_S_COMPLETE;
406 }
407 

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