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1 | /* | |
2 | * linux/net/sunrpc/auth_gss/auth_gss.c | |
3 | * | |
4 | * RPCSEC_GSS client authentication. | |
5 | * | |
6 | * Copyright (c) 2000 The Regents of the University of Michigan. | |
7 | * All rights reserved. | |
8 | * | |
9 | * Dug Song <dugsong@monkey.org> | |
10 | * Andy Adamson <andros@umich.edu> | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * | |
16 | * 1. Redistributions of source code must retain the above copyright | |
17 | * notice, this list of conditions and the following disclaimer. | |
18 | * 2. Redistributions in binary form must reproduce the above copyright | |
19 | * notice, this list of conditions and the following disclaimer in the | |
20 | * documentation and/or other materials provided with the distribution. | |
21 | * 3. Neither the name of the University nor the names of its | |
22 | * contributors may be used to endorse or promote products derived | |
23 | * from this software without specific prior written permission. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
26 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
27 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
28 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
32 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
33 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
34 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
35 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
36 | */ | |
37 | ||
38 | ||
39 | #include <linux/module.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/types.h> | |
42 | #include <linux/slab.h> | |
43 | #include <linux/sched.h> | |
44 | #include <linux/pagemap.h> | |
45 | #include <linux/sunrpc/clnt.h> | |
46 | #include <linux/sunrpc/auth.h> | |
47 | #include <linux/sunrpc/auth_gss.h> | |
48 | #include <linux/sunrpc/svcauth_gss.h> | |
49 | #include <linux/sunrpc/gss_err.h> | |
50 | #include <linux/workqueue.h> | |
51 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
52 | #include <linux/sunrpc/gss_api.h> | |
53 | #include <linux/uaccess.h> | |
54 | #include <linux/hashtable.h> | |
55 | ||
56 | #include "../netns.h" | |
57 | ||
58 | static const struct rpc_authops authgss_ops; | |
59 | ||
60 | static const struct rpc_credops gss_credops; | |
61 | static const struct rpc_credops gss_nullops; | |
62 | ||
63 | #define GSS_RETRY_EXPIRED 5 | |
64 | static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; | |
65 | ||
66 | #define GSS_KEY_EXPIRE_TIMEO 240 | |
67 | static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO; | |
68 | ||
69 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) | |
70 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
71 | #endif | |
72 | ||
73 | #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) | |
74 | /* length of a krb5 verifier (48), plus data added before arguments when | |
75 | * using integrity (two 4-byte integers): */ | |
76 | #define GSS_VERF_SLACK 100 | |
77 | ||
78 | static DEFINE_HASHTABLE(gss_auth_hash_table, 4); | |
79 | static DEFINE_SPINLOCK(gss_auth_hash_lock); | |
80 | ||
81 | struct gss_pipe { | |
82 | struct rpc_pipe_dir_object pdo; | |
83 | struct rpc_pipe *pipe; | |
84 | struct rpc_clnt *clnt; | |
85 | const char *name; | |
86 | struct kref kref; | |
87 | }; | |
88 | ||
89 | struct gss_auth { | |
90 | struct kref kref; | |
91 | struct hlist_node hash; | |
92 | struct rpc_auth rpc_auth; | |
93 | struct gss_api_mech *mech; | |
94 | enum rpc_gss_svc service; | |
95 | struct rpc_clnt *client; | |
96 | struct net *net; | |
97 | /* | |
98 | * There are two upcall pipes; dentry[1], named "gssd", is used | |
99 | * for the new text-based upcall; dentry[0] is named after the | |
100 | * mechanism (for example, "krb5") and exists for | |
101 | * backwards-compatibility with older gssd's. | |
102 | */ | |
103 | struct gss_pipe *gss_pipe[2]; | |
104 | const char *target_name; | |
105 | }; | |
106 | ||
107 | /* pipe_version >= 0 if and only if someone has a pipe open. */ | |
108 | static DEFINE_SPINLOCK(pipe_version_lock); | |
109 | static struct rpc_wait_queue pipe_version_rpc_waitqueue; | |
110 | static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); | |
111 | static void gss_put_auth(struct gss_auth *gss_auth); | |
112 | ||
113 | static void gss_free_ctx(struct gss_cl_ctx *); | |
114 | static const struct rpc_pipe_ops gss_upcall_ops_v0; | |
115 | static const struct rpc_pipe_ops gss_upcall_ops_v1; | |
116 | ||
117 | static inline struct gss_cl_ctx * | |
118 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
119 | { | |
120 | atomic_inc(&ctx->count); | |
121 | return ctx; | |
122 | } | |
123 | ||
124 | static inline void | |
125 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
126 | { | |
127 | if (atomic_dec_and_test(&ctx->count)) | |
128 | gss_free_ctx(ctx); | |
129 | } | |
130 | ||
131 | /* gss_cred_set_ctx: | |
132 | * called by gss_upcall_callback and gss_create_upcall in order | |
133 | * to set the gss context. The actual exchange of an old context | |
134 | * and a new one is protected by the pipe->lock. | |
135 | */ | |
136 | static void | |
137 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
138 | { | |
139 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
140 | ||
141 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) | |
142 | return; | |
143 | gss_get_ctx(ctx); | |
144 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); | |
145 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); | |
146 | smp_mb__before_atomic(); | |
147 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); | |
148 | } | |
149 | ||
150 | static const void * | |
151 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
152 | { | |
153 | const void *q = (const void *)((const char *)p + len); | |
154 | if (unlikely(q > end || q < p)) | |
155 | return ERR_PTR(-EFAULT); | |
156 | memcpy(res, p, len); | |
157 | return q; | |
158 | } | |
159 | ||
160 | static inline const void * | |
161 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
162 | { | |
163 | const void *q; | |
164 | unsigned int len; | |
165 | ||
166 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
167 | if (IS_ERR(p)) | |
168 | return p; | |
169 | q = (const void *)((const char *)p + len); | |
170 | if (unlikely(q > end || q < p)) | |
171 | return ERR_PTR(-EFAULT); | |
172 | dest->data = kmemdup(p, len, GFP_NOFS); | |
173 | if (unlikely(dest->data == NULL)) | |
174 | return ERR_PTR(-ENOMEM); | |
175 | dest->len = len; | |
176 | return q; | |
177 | } | |
178 | ||
179 | static struct gss_cl_ctx * | |
180 | gss_cred_get_ctx(struct rpc_cred *cred) | |
181 | { | |
182 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
183 | struct gss_cl_ctx *ctx = NULL; | |
184 | ||
185 | rcu_read_lock(); | |
186 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
187 | if (ctx) | |
188 | gss_get_ctx(ctx); | |
189 | rcu_read_unlock(); | |
190 | return ctx; | |
191 | } | |
192 | ||
193 | static struct gss_cl_ctx * | |
194 | gss_alloc_context(void) | |
195 | { | |
196 | struct gss_cl_ctx *ctx; | |
197 | ||
198 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); | |
199 | if (ctx != NULL) { | |
200 | ctx->gc_proc = RPC_GSS_PROC_DATA; | |
201 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
202 | spin_lock_init(&ctx->gc_seq_lock); | |
203 | atomic_set(&ctx->count,1); | |
204 | } | |
205 | return ctx; | |
206 | } | |
207 | ||
208 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
209 | static const void * | |
210 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
211 | { | |
212 | const void *q; | |
213 | unsigned int seclen; | |
214 | unsigned int timeout; | |
215 | unsigned long now = jiffies; | |
216 | u32 window_size; | |
217 | int ret; | |
218 | ||
219 | /* First unsigned int gives the remaining lifetime in seconds of the | |
220 | * credential - e.g. the remaining TGT lifetime for Kerberos or | |
221 | * the -t value passed to GSSD. | |
222 | */ | |
223 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); | |
224 | if (IS_ERR(p)) | |
225 | goto err; | |
226 | if (timeout == 0) | |
227 | timeout = GSSD_MIN_TIMEOUT; | |
228 | ctx->gc_expiry = now + ((unsigned long)timeout * HZ); | |
229 | /* Sequence number window. Determines the maximum number of | |
230 | * simultaneous requests | |
231 | */ | |
232 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); | |
233 | if (IS_ERR(p)) | |
234 | goto err; | |
235 | ctx->gc_win = window_size; | |
236 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
237 | if (ctx->gc_win == 0) { | |
238 | /* | |
239 | * in which case, p points to an error code. Anything other | |
240 | * than -EKEYEXPIRED gets converted to -EACCES. | |
241 | */ | |
242 | p = simple_get_bytes(p, end, &ret, sizeof(ret)); | |
243 | if (!IS_ERR(p)) | |
244 | p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : | |
245 | ERR_PTR(-EACCES); | |
246 | goto err; | |
247 | } | |
248 | /* copy the opaque wire context */ | |
249 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
250 | if (IS_ERR(p)) | |
251 | goto err; | |
252 | /* import the opaque security context */ | |
253 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
254 | if (IS_ERR(p)) | |
255 | goto err; | |
256 | q = (const void *)((const char *)p + seclen); | |
257 | if (unlikely(q > end || q < p)) { | |
258 | p = ERR_PTR(-EFAULT); | |
259 | goto err; | |
260 | } | |
261 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); | |
262 | if (ret < 0) { | |
263 | p = ERR_PTR(ret); | |
264 | goto err; | |
265 | } | |
266 | ||
267 | /* is there any trailing data? */ | |
268 | if (q == end) { | |
269 | p = q; | |
270 | goto done; | |
271 | } | |
272 | ||
273 | /* pull in acceptor name (if there is one) */ | |
274 | p = simple_get_netobj(q, end, &ctx->gc_acceptor); | |
275 | if (IS_ERR(p)) | |
276 | goto err; | |
277 | done: | |
278 | dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u acceptor %.*s\n", | |
279 | __func__, ctx->gc_expiry, now, timeout, ctx->gc_acceptor.len, | |
280 | ctx->gc_acceptor.data); | |
281 | return p; | |
282 | err: | |
283 | dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); | |
284 | return p; | |
285 | } | |
286 | ||
287 | #define UPCALL_BUF_LEN 128 | |
288 | ||
289 | struct gss_upcall_msg { | |
290 | atomic_t count; | |
291 | kuid_t uid; | |
292 | struct rpc_pipe_msg msg; | |
293 | struct list_head list; | |
294 | struct gss_auth *auth; | |
295 | struct rpc_pipe *pipe; | |
296 | struct rpc_wait_queue rpc_waitqueue; | |
297 | wait_queue_head_t waitqueue; | |
298 | struct gss_cl_ctx *ctx; | |
299 | char databuf[UPCALL_BUF_LEN]; | |
300 | }; | |
301 | ||
302 | static int get_pipe_version(struct net *net) | |
303 | { | |
304 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
305 | int ret; | |
306 | ||
307 | spin_lock(&pipe_version_lock); | |
308 | if (sn->pipe_version >= 0) { | |
309 | atomic_inc(&sn->pipe_users); | |
310 | ret = sn->pipe_version; | |
311 | } else | |
312 | ret = -EAGAIN; | |
313 | spin_unlock(&pipe_version_lock); | |
314 | return ret; | |
315 | } | |
316 | ||
317 | static void put_pipe_version(struct net *net) | |
318 | { | |
319 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
320 | ||
321 | if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { | |
322 | sn->pipe_version = -1; | |
323 | spin_unlock(&pipe_version_lock); | |
324 | } | |
325 | } | |
326 | ||
327 | static void | |
328 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
329 | { | |
330 | struct net *net = gss_msg->auth->net; | |
331 | if (!atomic_dec_and_test(&gss_msg->count)) | |
332 | return; | |
333 | put_pipe_version(net); | |
334 | BUG_ON(!list_empty(&gss_msg->list)); | |
335 | if (gss_msg->ctx != NULL) | |
336 | gss_put_ctx(gss_msg->ctx); | |
337 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); | |
338 | gss_put_auth(gss_msg->auth); | |
339 | kfree(gss_msg); | |
340 | } | |
341 | ||
342 | static struct gss_upcall_msg * | |
343 | __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid, const struct gss_auth *auth) | |
344 | { | |
345 | struct gss_upcall_msg *pos; | |
346 | list_for_each_entry(pos, &pipe->in_downcall, list) { | |
347 | if (!uid_eq(pos->uid, uid)) | |
348 | continue; | |
349 | if (auth && pos->auth->service != auth->service) | |
350 | continue; | |
351 | atomic_inc(&pos->count); | |
352 | dprintk("RPC: %s found msg %p\n", __func__, pos); | |
353 | return pos; | |
354 | } | |
355 | dprintk("RPC: %s found nothing\n", __func__); | |
356 | return NULL; | |
357 | } | |
358 | ||
359 | /* Try to add an upcall to the pipefs queue. | |
360 | * If an upcall owned by our uid already exists, then we return a reference | |
361 | * to that upcall instead of adding the new upcall. | |
362 | */ | |
363 | static inline struct gss_upcall_msg * | |
364 | gss_add_msg(struct gss_upcall_msg *gss_msg) | |
365 | { | |
366 | struct rpc_pipe *pipe = gss_msg->pipe; | |
367 | struct gss_upcall_msg *old; | |
368 | ||
369 | spin_lock(&pipe->lock); | |
370 | old = __gss_find_upcall(pipe, gss_msg->uid, gss_msg->auth); | |
371 | if (old == NULL) { | |
372 | atomic_inc(&gss_msg->count); | |
373 | list_add(&gss_msg->list, &pipe->in_downcall); | |
374 | } else | |
375 | gss_msg = old; | |
376 | spin_unlock(&pipe->lock); | |
377 | return gss_msg; | |
378 | } | |
379 | ||
380 | static void | |
381 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
382 | { | |
383 | list_del_init(&gss_msg->list); | |
384 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
385 | wake_up_all(&gss_msg->waitqueue); | |
386 | atomic_dec(&gss_msg->count); | |
387 | } | |
388 | ||
389 | static void | |
390 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
391 | { | |
392 | struct rpc_pipe *pipe = gss_msg->pipe; | |
393 | ||
394 | if (list_empty(&gss_msg->list)) | |
395 | return; | |
396 | spin_lock(&pipe->lock); | |
397 | if (!list_empty(&gss_msg->list)) | |
398 | __gss_unhash_msg(gss_msg); | |
399 | spin_unlock(&pipe->lock); | |
400 | } | |
401 | ||
402 | static void | |
403 | gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) | |
404 | { | |
405 | switch (gss_msg->msg.errno) { | |
406 | case 0: | |
407 | if (gss_msg->ctx == NULL) | |
408 | break; | |
409 | clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
410 | gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); | |
411 | break; | |
412 | case -EKEYEXPIRED: | |
413 | set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
414 | } | |
415 | gss_cred->gc_upcall_timestamp = jiffies; | |
416 | gss_cred->gc_upcall = NULL; | |
417 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
418 | } | |
419 | ||
420 | static void | |
421 | gss_upcall_callback(struct rpc_task *task) | |
422 | { | |
423 | struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, | |
424 | struct gss_cred, gc_base); | |
425 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
426 | struct rpc_pipe *pipe = gss_msg->pipe; | |
427 | ||
428 | spin_lock(&pipe->lock); | |
429 | gss_handle_downcall_result(gss_cred, gss_msg); | |
430 | spin_unlock(&pipe->lock); | |
431 | task->tk_status = gss_msg->msg.errno; | |
432 | gss_release_msg(gss_msg); | |
433 | } | |
434 | ||
435 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) | |
436 | { | |
437 | uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); | |
438 | memcpy(gss_msg->databuf, &uid, sizeof(uid)); | |
439 | gss_msg->msg.data = gss_msg->databuf; | |
440 | gss_msg->msg.len = sizeof(uid); | |
441 | ||
442 | BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf)); | |
443 | } | |
444 | ||
445 | static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, | |
446 | const char *service_name, | |
447 | const char *target_name) | |
448 | { | |
449 | struct gss_api_mech *mech = gss_msg->auth->mech; | |
450 | char *p = gss_msg->databuf; | |
451 | size_t buflen = sizeof(gss_msg->databuf); | |
452 | int len; | |
453 | ||
454 | len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name, | |
455 | from_kuid(&init_user_ns, gss_msg->uid)); | |
456 | buflen -= len; | |
457 | p += len; | |
458 | gss_msg->msg.len = len; | |
459 | if (target_name) { | |
460 | len = scnprintf(p, buflen, "target=%s ", target_name); | |
461 | buflen -= len; | |
462 | p += len; | |
463 | gss_msg->msg.len += len; | |
464 | } | |
465 | if (service_name != NULL) { | |
466 | len = scnprintf(p, buflen, "service=%s ", service_name); | |
467 | buflen -= len; | |
468 | p += len; | |
469 | gss_msg->msg.len += len; | |
470 | } | |
471 | if (mech->gm_upcall_enctypes) { | |
472 | len = scnprintf(p, buflen, "enctypes=%s ", | |
473 | mech->gm_upcall_enctypes); | |
474 | buflen -= len; | |
475 | p += len; | |
476 | gss_msg->msg.len += len; | |
477 | } | |
478 | len = scnprintf(p, buflen, "\n"); | |
479 | if (len == 0) | |
480 | goto out_overflow; | |
481 | gss_msg->msg.len += len; | |
482 | ||
483 | gss_msg->msg.data = gss_msg->databuf; | |
484 | return 0; | |
485 | out_overflow: | |
486 | WARN_ON_ONCE(1); | |
487 | return -ENOMEM; | |
488 | } | |
489 | ||
490 | static struct gss_upcall_msg * | |
491 | gss_alloc_msg(struct gss_auth *gss_auth, | |
492 | kuid_t uid, const char *service_name) | |
493 | { | |
494 | struct gss_upcall_msg *gss_msg; | |
495 | int vers; | |
496 | int err = -ENOMEM; | |
497 | ||
498 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); | |
499 | if (gss_msg == NULL) | |
500 | goto err; | |
501 | vers = get_pipe_version(gss_auth->net); | |
502 | err = vers; | |
503 | if (err < 0) | |
504 | goto err_free_msg; | |
505 | gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe; | |
506 | INIT_LIST_HEAD(&gss_msg->list); | |
507 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
508 | init_waitqueue_head(&gss_msg->waitqueue); | |
509 | atomic_set(&gss_msg->count, 1); | |
510 | gss_msg->uid = uid; | |
511 | gss_msg->auth = gss_auth; | |
512 | switch (vers) { | |
513 | case 0: | |
514 | gss_encode_v0_msg(gss_msg); | |
515 | break; | |
516 | default: | |
517 | err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name); | |
518 | if (err) | |
519 | goto err_put_pipe_version; | |
520 | }; | |
521 | kref_get(&gss_auth->kref); | |
522 | return gss_msg; | |
523 | err_put_pipe_version: | |
524 | put_pipe_version(gss_auth->net); | |
525 | err_free_msg: | |
526 | kfree(gss_msg); | |
527 | err: | |
528 | return ERR_PTR(err); | |
529 | } | |
530 | ||
531 | static struct gss_upcall_msg * | |
532 | gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred) | |
533 | { | |
534 | struct gss_cred *gss_cred = container_of(cred, | |
535 | struct gss_cred, gc_base); | |
536 | struct gss_upcall_msg *gss_new, *gss_msg; | |
537 | kuid_t uid = cred->cr_uid; | |
538 | ||
539 | gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal); | |
540 | if (IS_ERR(gss_new)) | |
541 | return gss_new; | |
542 | gss_msg = gss_add_msg(gss_new); | |
543 | if (gss_msg == gss_new) { | |
544 | int res; | |
545 | atomic_inc(&gss_msg->count); | |
546 | res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); | |
547 | if (res) { | |
548 | gss_unhash_msg(gss_new); | |
549 | atomic_dec(&gss_msg->count); | |
550 | gss_release_msg(gss_new); | |
551 | gss_msg = ERR_PTR(res); | |
552 | } | |
553 | } else | |
554 | gss_release_msg(gss_new); | |
555 | return gss_msg; | |
556 | } | |
557 | ||
558 | static void warn_gssd(void) | |
559 | { | |
560 | dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n"); | |
561 | } | |
562 | ||
563 | static inline int | |
564 | gss_refresh_upcall(struct rpc_task *task) | |
565 | { | |
566 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; | |
567 | struct gss_auth *gss_auth = container_of(cred->cr_auth, | |
568 | struct gss_auth, rpc_auth); | |
569 | struct gss_cred *gss_cred = container_of(cred, | |
570 | struct gss_cred, gc_base); | |
571 | struct gss_upcall_msg *gss_msg; | |
572 | struct rpc_pipe *pipe; | |
573 | int err = 0; | |
574 | ||
575 | dprintk("RPC: %5u %s for uid %u\n", | |
576 | task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid)); | |
577 | gss_msg = gss_setup_upcall(gss_auth, cred); | |
578 | if (PTR_ERR(gss_msg) == -EAGAIN) { | |
579 | /* XXX: warning on the first, under the assumption we | |
580 | * shouldn't normally hit this case on a refresh. */ | |
581 | warn_gssd(); | |
582 | task->tk_timeout = 15*HZ; | |
583 | rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); | |
584 | return -EAGAIN; | |
585 | } | |
586 | if (IS_ERR(gss_msg)) { | |
587 | err = PTR_ERR(gss_msg); | |
588 | goto out; | |
589 | } | |
590 | pipe = gss_msg->pipe; | |
591 | spin_lock(&pipe->lock); | |
592 | if (gss_cred->gc_upcall != NULL) | |
593 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); | |
594 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { | |
595 | task->tk_timeout = 0; | |
596 | gss_cred->gc_upcall = gss_msg; | |
597 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
598 | atomic_inc(&gss_msg->count); | |
599 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); | |
600 | } else { | |
601 | gss_handle_downcall_result(gss_cred, gss_msg); | |
602 | err = gss_msg->msg.errno; | |
603 | } | |
604 | spin_unlock(&pipe->lock); | |
605 | gss_release_msg(gss_msg); | |
606 | out: | |
607 | dprintk("RPC: %5u %s for uid %u result %d\n", | |
608 | task->tk_pid, __func__, | |
609 | from_kuid(&init_user_ns, cred->cr_uid), err); | |
610 | return err; | |
611 | } | |
612 | ||
613 | static inline int | |
614 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
615 | { | |
616 | struct net *net = gss_auth->net; | |
617 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
618 | struct rpc_pipe *pipe; | |
619 | struct rpc_cred *cred = &gss_cred->gc_base; | |
620 | struct gss_upcall_msg *gss_msg; | |
621 | DEFINE_WAIT(wait); | |
622 | int err; | |
623 | ||
624 | dprintk("RPC: %s for uid %u\n", | |
625 | __func__, from_kuid(&init_user_ns, cred->cr_uid)); | |
626 | retry: | |
627 | err = 0; | |
628 | /* if gssd is down, just skip upcalling altogether */ | |
629 | if (!gssd_running(net)) { | |
630 | warn_gssd(); | |
631 | return -EACCES; | |
632 | } | |
633 | gss_msg = gss_setup_upcall(gss_auth, cred); | |
634 | if (PTR_ERR(gss_msg) == -EAGAIN) { | |
635 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, | |
636 | sn->pipe_version >= 0, 15 * HZ); | |
637 | if (sn->pipe_version < 0) { | |
638 | warn_gssd(); | |
639 | err = -EACCES; | |
640 | } | |
641 | if (err < 0) | |
642 | goto out; | |
643 | goto retry; | |
644 | } | |
645 | if (IS_ERR(gss_msg)) { | |
646 | err = PTR_ERR(gss_msg); | |
647 | goto out; | |
648 | } | |
649 | pipe = gss_msg->pipe; | |
650 | for (;;) { | |
651 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); | |
652 | spin_lock(&pipe->lock); | |
653 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { | |
654 | break; | |
655 | } | |
656 | spin_unlock(&pipe->lock); | |
657 | if (fatal_signal_pending(current)) { | |
658 | err = -ERESTARTSYS; | |
659 | goto out_intr; | |
660 | } | |
661 | schedule(); | |
662 | } | |
663 | if (gss_msg->ctx) | |
664 | gss_cred_set_ctx(cred, gss_msg->ctx); | |
665 | else | |
666 | err = gss_msg->msg.errno; | |
667 | spin_unlock(&pipe->lock); | |
668 | out_intr: | |
669 | finish_wait(&gss_msg->waitqueue, &wait); | |
670 | gss_release_msg(gss_msg); | |
671 | out: | |
672 | dprintk("RPC: %s for uid %u result %d\n", | |
673 | __func__, from_kuid(&init_user_ns, cred->cr_uid), err); | |
674 | return err; | |
675 | } | |
676 | ||
677 | #define MSG_BUF_MAXSIZE 1024 | |
678 | ||
679 | static ssize_t | |
680 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
681 | { | |
682 | const void *p, *end; | |
683 | void *buf; | |
684 | struct gss_upcall_msg *gss_msg; | |
685 | struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; | |
686 | struct gss_cl_ctx *ctx; | |
687 | uid_t id; | |
688 | kuid_t uid; | |
689 | ssize_t err = -EFBIG; | |
690 | ||
691 | if (mlen > MSG_BUF_MAXSIZE) | |
692 | goto out; | |
693 | err = -ENOMEM; | |
694 | buf = kmalloc(mlen, GFP_NOFS); | |
695 | if (!buf) | |
696 | goto out; | |
697 | ||
698 | err = -EFAULT; | |
699 | if (copy_from_user(buf, src, mlen)) | |
700 | goto err; | |
701 | ||
702 | end = (const void *)((char *)buf + mlen); | |
703 | p = simple_get_bytes(buf, end, &id, sizeof(id)); | |
704 | if (IS_ERR(p)) { | |
705 | err = PTR_ERR(p); | |
706 | goto err; | |
707 | } | |
708 | ||
709 | uid = make_kuid(&init_user_ns, id); | |
710 | if (!uid_valid(uid)) { | |
711 | err = -EINVAL; | |
712 | goto err; | |
713 | } | |
714 | ||
715 | err = -ENOMEM; | |
716 | ctx = gss_alloc_context(); | |
717 | if (ctx == NULL) | |
718 | goto err; | |
719 | ||
720 | err = -ENOENT; | |
721 | /* Find a matching upcall */ | |
722 | spin_lock(&pipe->lock); | |
723 | gss_msg = __gss_find_upcall(pipe, uid, NULL); | |
724 | if (gss_msg == NULL) { | |
725 | spin_unlock(&pipe->lock); | |
726 | goto err_put_ctx; | |
727 | } | |
728 | list_del_init(&gss_msg->list); | |
729 | spin_unlock(&pipe->lock); | |
730 | ||
731 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); | |
732 | if (IS_ERR(p)) { | |
733 | err = PTR_ERR(p); | |
734 | switch (err) { | |
735 | case -EACCES: | |
736 | case -EKEYEXPIRED: | |
737 | gss_msg->msg.errno = err; | |
738 | err = mlen; | |
739 | break; | |
740 | case -EFAULT: | |
741 | case -ENOMEM: | |
742 | case -EINVAL: | |
743 | case -ENOSYS: | |
744 | gss_msg->msg.errno = -EAGAIN; | |
745 | break; | |
746 | default: | |
747 | printk(KERN_CRIT "%s: bad return from " | |
748 | "gss_fill_context: %zd\n", __func__, err); | |
749 | gss_msg->msg.errno = -EIO; | |
750 | } | |
751 | goto err_release_msg; | |
752 | } | |
753 | gss_msg->ctx = gss_get_ctx(ctx); | |
754 | err = mlen; | |
755 | ||
756 | err_release_msg: | |
757 | spin_lock(&pipe->lock); | |
758 | __gss_unhash_msg(gss_msg); | |
759 | spin_unlock(&pipe->lock); | |
760 | gss_release_msg(gss_msg); | |
761 | err_put_ctx: | |
762 | gss_put_ctx(ctx); | |
763 | err: | |
764 | kfree(buf); | |
765 | out: | |
766 | dprintk("RPC: %s returning %zd\n", __func__, err); | |
767 | return err; | |
768 | } | |
769 | ||
770 | static int gss_pipe_open(struct inode *inode, int new_version) | |
771 | { | |
772 | struct net *net = inode->i_sb->s_fs_info; | |
773 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
774 | int ret = 0; | |
775 | ||
776 | spin_lock(&pipe_version_lock); | |
777 | if (sn->pipe_version < 0) { | |
778 | /* First open of any gss pipe determines the version: */ | |
779 | sn->pipe_version = new_version; | |
780 | rpc_wake_up(&pipe_version_rpc_waitqueue); | |
781 | wake_up(&pipe_version_waitqueue); | |
782 | } else if (sn->pipe_version != new_version) { | |
783 | /* Trying to open a pipe of a different version */ | |
784 | ret = -EBUSY; | |
785 | goto out; | |
786 | } | |
787 | atomic_inc(&sn->pipe_users); | |
788 | out: | |
789 | spin_unlock(&pipe_version_lock); | |
790 | return ret; | |
791 | ||
792 | } | |
793 | ||
794 | static int gss_pipe_open_v0(struct inode *inode) | |
795 | { | |
796 | return gss_pipe_open(inode, 0); | |
797 | } | |
798 | ||
799 | static int gss_pipe_open_v1(struct inode *inode) | |
800 | { | |
801 | return gss_pipe_open(inode, 1); | |
802 | } | |
803 | ||
804 | static void | |
805 | gss_pipe_release(struct inode *inode) | |
806 | { | |
807 | struct net *net = inode->i_sb->s_fs_info; | |
808 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; | |
809 | struct gss_upcall_msg *gss_msg; | |
810 | ||
811 | restart: | |
812 | spin_lock(&pipe->lock); | |
813 | list_for_each_entry(gss_msg, &pipe->in_downcall, list) { | |
814 | ||
815 | if (!list_empty(&gss_msg->msg.list)) | |
816 | continue; | |
817 | gss_msg->msg.errno = -EPIPE; | |
818 | atomic_inc(&gss_msg->count); | |
819 | __gss_unhash_msg(gss_msg); | |
820 | spin_unlock(&pipe->lock); | |
821 | gss_release_msg(gss_msg); | |
822 | goto restart; | |
823 | } | |
824 | spin_unlock(&pipe->lock); | |
825 | ||
826 | put_pipe_version(net); | |
827 | } | |
828 | ||
829 | static void | |
830 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
831 | { | |
832 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
833 | ||
834 | if (msg->errno < 0) { | |
835 | dprintk("RPC: %s releasing msg %p\n", | |
836 | __func__, gss_msg); | |
837 | atomic_inc(&gss_msg->count); | |
838 | gss_unhash_msg(gss_msg); | |
839 | if (msg->errno == -ETIMEDOUT) | |
840 | warn_gssd(); | |
841 | gss_release_msg(gss_msg); | |
842 | } | |
843 | gss_release_msg(gss_msg); | |
844 | } | |
845 | ||
846 | static void gss_pipe_dentry_destroy(struct dentry *dir, | |
847 | struct rpc_pipe_dir_object *pdo) | |
848 | { | |
849 | struct gss_pipe *gss_pipe = pdo->pdo_data; | |
850 | struct rpc_pipe *pipe = gss_pipe->pipe; | |
851 | ||
852 | if (pipe->dentry != NULL) { | |
853 | rpc_unlink(pipe->dentry); | |
854 | pipe->dentry = NULL; | |
855 | } | |
856 | } | |
857 | ||
858 | static int gss_pipe_dentry_create(struct dentry *dir, | |
859 | struct rpc_pipe_dir_object *pdo) | |
860 | { | |
861 | struct gss_pipe *p = pdo->pdo_data; | |
862 | struct dentry *dentry; | |
863 | ||
864 | dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe); | |
865 | if (IS_ERR(dentry)) | |
866 | return PTR_ERR(dentry); | |
867 | p->pipe->dentry = dentry; | |
868 | return 0; | |
869 | } | |
870 | ||
871 | static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = { | |
872 | .create = gss_pipe_dentry_create, | |
873 | .destroy = gss_pipe_dentry_destroy, | |
874 | }; | |
875 | ||
876 | static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt, | |
877 | const char *name, | |
878 | const struct rpc_pipe_ops *upcall_ops) | |
879 | { | |
880 | struct gss_pipe *p; | |
881 | int err = -ENOMEM; | |
882 | ||
883 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
884 | if (p == NULL) | |
885 | goto err; | |
886 | p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
887 | if (IS_ERR(p->pipe)) { | |
888 | err = PTR_ERR(p->pipe); | |
889 | goto err_free_gss_pipe; | |
890 | } | |
891 | p->name = name; | |
892 | p->clnt = clnt; | |
893 | kref_init(&p->kref); | |
894 | rpc_init_pipe_dir_object(&p->pdo, | |
895 | &gss_pipe_dir_object_ops, | |
896 | p); | |
897 | return p; | |
898 | err_free_gss_pipe: | |
899 | kfree(p); | |
900 | err: | |
901 | return ERR_PTR(err); | |
902 | } | |
903 | ||
904 | struct gss_alloc_pdo { | |
905 | struct rpc_clnt *clnt; | |
906 | const char *name; | |
907 | const struct rpc_pipe_ops *upcall_ops; | |
908 | }; | |
909 | ||
910 | static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data) | |
911 | { | |
912 | struct gss_pipe *gss_pipe; | |
913 | struct gss_alloc_pdo *args = data; | |
914 | ||
915 | if (pdo->pdo_ops != &gss_pipe_dir_object_ops) | |
916 | return 0; | |
917 | gss_pipe = container_of(pdo, struct gss_pipe, pdo); | |
918 | if (strcmp(gss_pipe->name, args->name) != 0) | |
919 | return 0; | |
920 | if (!kref_get_unless_zero(&gss_pipe->kref)) | |
921 | return 0; | |
922 | return 1; | |
923 | } | |
924 | ||
925 | static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data) | |
926 | { | |
927 | struct gss_pipe *gss_pipe; | |
928 | struct gss_alloc_pdo *args = data; | |
929 | ||
930 | gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops); | |
931 | if (!IS_ERR(gss_pipe)) | |
932 | return &gss_pipe->pdo; | |
933 | return NULL; | |
934 | } | |
935 | ||
936 | static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt, | |
937 | const char *name, | |
938 | const struct rpc_pipe_ops *upcall_ops) | |
939 | { | |
940 | struct net *net = rpc_net_ns(clnt); | |
941 | struct rpc_pipe_dir_object *pdo; | |
942 | struct gss_alloc_pdo args = { | |
943 | .clnt = clnt, | |
944 | .name = name, | |
945 | .upcall_ops = upcall_ops, | |
946 | }; | |
947 | ||
948 | pdo = rpc_find_or_alloc_pipe_dir_object(net, | |
949 | &clnt->cl_pipedir_objects, | |
950 | gss_pipe_match_pdo, | |
951 | gss_pipe_alloc_pdo, | |
952 | &args); | |
953 | if (pdo != NULL) | |
954 | return container_of(pdo, struct gss_pipe, pdo); | |
955 | return ERR_PTR(-ENOMEM); | |
956 | } | |
957 | ||
958 | static void __gss_pipe_free(struct gss_pipe *p) | |
959 | { | |
960 | struct rpc_clnt *clnt = p->clnt; | |
961 | struct net *net = rpc_net_ns(clnt); | |
962 | ||
963 | rpc_remove_pipe_dir_object(net, | |
964 | &clnt->cl_pipedir_objects, | |
965 | &p->pdo); | |
966 | rpc_destroy_pipe_data(p->pipe); | |
967 | kfree(p); | |
968 | } | |
969 | ||
970 | static void __gss_pipe_release(struct kref *kref) | |
971 | { | |
972 | struct gss_pipe *p = container_of(kref, struct gss_pipe, kref); | |
973 | ||
974 | __gss_pipe_free(p); | |
975 | } | |
976 | ||
977 | static void gss_pipe_free(struct gss_pipe *p) | |
978 | { | |
979 | if (p != NULL) | |
980 | kref_put(&p->kref, __gss_pipe_release); | |
981 | } | |
982 | ||
983 | /* | |
984 | * NOTE: we have the opportunity to use different | |
985 | * parameters based on the input flavor (which must be a pseudoflavor) | |
986 | */ | |
987 | static struct gss_auth * | |
988 | gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) | |
989 | { | |
990 | rpc_authflavor_t flavor = args->pseudoflavor; | |
991 | struct gss_auth *gss_auth; | |
992 | struct gss_pipe *gss_pipe; | |
993 | struct rpc_auth * auth; | |
994 | int err = -ENOMEM; /* XXX? */ | |
995 | ||
996 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); | |
997 | ||
998 | if (!try_module_get(THIS_MODULE)) | |
999 | return ERR_PTR(err); | |
1000 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) | |
1001 | goto out_dec; | |
1002 | INIT_HLIST_NODE(&gss_auth->hash); | |
1003 | gss_auth->target_name = NULL; | |
1004 | if (args->target_name) { | |
1005 | gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL); | |
1006 | if (gss_auth->target_name == NULL) | |
1007 | goto err_free; | |
1008 | } | |
1009 | gss_auth->client = clnt; | |
1010 | gss_auth->net = get_net(rpc_net_ns(clnt)); | |
1011 | err = -EINVAL; | |
1012 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); | |
1013 | if (!gss_auth->mech) { | |
1014 | dprintk("RPC: Pseudoflavor %d not found!\n", flavor); | |
1015 | goto err_put_net; | |
1016 | } | |
1017 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
1018 | if (gss_auth->service == 0) | |
1019 | goto err_put_mech; | |
1020 | if (!gssd_running(gss_auth->net)) | |
1021 | goto err_put_mech; | |
1022 | auth = &gss_auth->rpc_auth; | |
1023 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
1024 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
1025 | auth->au_flags = 0; | |
1026 | auth->au_ops = &authgss_ops; | |
1027 | auth->au_flavor = flavor; | |
1028 | if (gss_pseudoflavor_to_datatouch(gss_auth->mech, flavor)) | |
1029 | auth->au_flags |= RPCAUTH_AUTH_DATATOUCH; | |
1030 | atomic_set(&auth->au_count, 1); | |
1031 | kref_init(&gss_auth->kref); | |
1032 | ||
1033 | err = rpcauth_init_credcache(auth); | |
1034 | if (err) | |
1035 | goto err_put_mech; | |
1036 | /* | |
1037 | * Note: if we created the old pipe first, then someone who | |
1038 | * examined the directory at the right moment might conclude | |
1039 | * that we supported only the old pipe. So we instead create | |
1040 | * the new pipe first. | |
1041 | */ | |
1042 | gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1); | |
1043 | if (IS_ERR(gss_pipe)) { | |
1044 | err = PTR_ERR(gss_pipe); | |
1045 | goto err_destroy_credcache; | |
1046 | } | |
1047 | gss_auth->gss_pipe[1] = gss_pipe; | |
1048 | ||
1049 | gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name, | |
1050 | &gss_upcall_ops_v0); | |
1051 | if (IS_ERR(gss_pipe)) { | |
1052 | err = PTR_ERR(gss_pipe); | |
1053 | goto err_destroy_pipe_1; | |
1054 | } | |
1055 | gss_auth->gss_pipe[0] = gss_pipe; | |
1056 | ||
1057 | return gss_auth; | |
1058 | err_destroy_pipe_1: | |
1059 | gss_pipe_free(gss_auth->gss_pipe[1]); | |
1060 | err_destroy_credcache: | |
1061 | rpcauth_destroy_credcache(auth); | |
1062 | err_put_mech: | |
1063 | gss_mech_put(gss_auth->mech); | |
1064 | err_put_net: | |
1065 | put_net(gss_auth->net); | |
1066 | err_free: | |
1067 | kfree(gss_auth->target_name); | |
1068 | kfree(gss_auth); | |
1069 | out_dec: | |
1070 | module_put(THIS_MODULE); | |
1071 | return ERR_PTR(err); | |
1072 | } | |
1073 | ||
1074 | static void | |
1075 | gss_free(struct gss_auth *gss_auth) | |
1076 | { | |
1077 | gss_pipe_free(gss_auth->gss_pipe[0]); | |
1078 | gss_pipe_free(gss_auth->gss_pipe[1]); | |
1079 | gss_mech_put(gss_auth->mech); | |
1080 | put_net(gss_auth->net); | |
1081 | kfree(gss_auth->target_name); | |
1082 | ||
1083 | kfree(gss_auth); | |
1084 | module_put(THIS_MODULE); | |
1085 | } | |
1086 | ||
1087 | static void | |
1088 | gss_free_callback(struct kref *kref) | |
1089 | { | |
1090 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
1091 | ||
1092 | gss_free(gss_auth); | |
1093 | } | |
1094 | ||
1095 | static void | |
1096 | gss_put_auth(struct gss_auth *gss_auth) | |
1097 | { | |
1098 | kref_put(&gss_auth->kref, gss_free_callback); | |
1099 | } | |
1100 | ||
1101 | static void | |
1102 | gss_destroy(struct rpc_auth *auth) | |
1103 | { | |
1104 | struct gss_auth *gss_auth = container_of(auth, | |
1105 | struct gss_auth, rpc_auth); | |
1106 | ||
1107 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", | |
1108 | auth, auth->au_flavor); | |
1109 | ||
1110 | if (hash_hashed(&gss_auth->hash)) { | |
1111 | spin_lock(&gss_auth_hash_lock); | |
1112 | hash_del(&gss_auth->hash); | |
1113 | spin_unlock(&gss_auth_hash_lock); | |
1114 | } | |
1115 | ||
1116 | gss_pipe_free(gss_auth->gss_pipe[0]); | |
1117 | gss_auth->gss_pipe[0] = NULL; | |
1118 | gss_pipe_free(gss_auth->gss_pipe[1]); | |
1119 | gss_auth->gss_pipe[1] = NULL; | |
1120 | rpcauth_destroy_credcache(auth); | |
1121 | ||
1122 | gss_put_auth(gss_auth); | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Auths may be shared between rpc clients that were cloned from a | |
1127 | * common client with the same xprt, if they also share the flavor and | |
1128 | * target_name. | |
1129 | * | |
1130 | * The auth is looked up from the oldest parent sharing the same | |
1131 | * cl_xprt, and the auth itself references only that common parent | |
1132 | * (which is guaranteed to last as long as any of its descendants). | |
1133 | */ | |
1134 | static struct gss_auth * | |
1135 | gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args, | |
1136 | struct rpc_clnt *clnt, | |
1137 | struct gss_auth *new) | |
1138 | { | |
1139 | struct gss_auth *gss_auth; | |
1140 | unsigned long hashval = (unsigned long)clnt; | |
1141 | ||
1142 | spin_lock(&gss_auth_hash_lock); | |
1143 | hash_for_each_possible(gss_auth_hash_table, | |
1144 | gss_auth, | |
1145 | hash, | |
1146 | hashval) { | |
1147 | if (gss_auth->client != clnt) | |
1148 | continue; | |
1149 | if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor) | |
1150 | continue; | |
1151 | if (gss_auth->target_name != args->target_name) { | |
1152 | if (gss_auth->target_name == NULL) | |
1153 | continue; | |
1154 | if (args->target_name == NULL) | |
1155 | continue; | |
1156 | if (strcmp(gss_auth->target_name, args->target_name)) | |
1157 | continue; | |
1158 | } | |
1159 | if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count)) | |
1160 | continue; | |
1161 | goto out; | |
1162 | } | |
1163 | if (new) | |
1164 | hash_add(gss_auth_hash_table, &new->hash, hashval); | |
1165 | gss_auth = new; | |
1166 | out: | |
1167 | spin_unlock(&gss_auth_hash_lock); | |
1168 | return gss_auth; | |
1169 | } | |
1170 | ||
1171 | static struct gss_auth * | |
1172 | gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) | |
1173 | { | |
1174 | struct gss_auth *gss_auth; | |
1175 | struct gss_auth *new; | |
1176 | ||
1177 | gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL); | |
1178 | if (gss_auth != NULL) | |
1179 | goto out; | |
1180 | new = gss_create_new(args, clnt); | |
1181 | if (IS_ERR(new)) | |
1182 | return new; | |
1183 | gss_auth = gss_auth_find_or_add_hashed(args, clnt, new); | |
1184 | if (gss_auth != new) | |
1185 | gss_destroy(&new->rpc_auth); | |
1186 | out: | |
1187 | return gss_auth; | |
1188 | } | |
1189 | ||
1190 | static struct rpc_auth * | |
1191 | gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) | |
1192 | { | |
1193 | struct gss_auth *gss_auth; | |
1194 | struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch); | |
1195 | ||
1196 | while (clnt != clnt->cl_parent) { | |
1197 | struct rpc_clnt *parent = clnt->cl_parent; | |
1198 | /* Find the original parent for this transport */ | |
1199 | if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps) | |
1200 | break; | |
1201 | clnt = parent; | |
1202 | } | |
1203 | ||
1204 | gss_auth = gss_create_hashed(args, clnt); | |
1205 | if (IS_ERR(gss_auth)) | |
1206 | return ERR_CAST(gss_auth); | |
1207 | return &gss_auth->rpc_auth; | |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
1212 | * to the server with the GSS control procedure field set to | |
1213 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
1214 | * all RPCSEC_GSS state associated with that context. | |
1215 | */ | |
1216 | static int | |
1217 | gss_destroying_context(struct rpc_cred *cred) | |
1218 | { | |
1219 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1220 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
1221 | struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1); | |
1222 | struct rpc_task *task; | |
1223 | ||
1224 | if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) | |
1225 | return 0; | |
1226 | ||
1227 | ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
1228 | cred->cr_ops = &gss_nullops; | |
1229 | ||
1230 | /* Take a reference to ensure the cred will be destroyed either | |
1231 | * by the RPC call or by the put_rpccred() below */ | |
1232 | get_rpccred(cred); | |
1233 | ||
1234 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); | |
1235 | if (!IS_ERR(task)) | |
1236 | rpc_put_task(task); | |
1237 | ||
1238 | put_rpccred(cred); | |
1239 | return 1; | |
1240 | } | |
1241 | ||
1242 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1243 | * to create a new cred or context, so they check that things have been | |
1244 | * allocated before freeing them. */ | |
1245 | static void | |
1246 | gss_do_free_ctx(struct gss_cl_ctx *ctx) | |
1247 | { | |
1248 | dprintk("RPC: %s\n", __func__); | |
1249 | ||
1250 | gss_delete_sec_context(&ctx->gc_gss_ctx); | |
1251 | kfree(ctx->gc_wire_ctx.data); | |
1252 | kfree(ctx->gc_acceptor.data); | |
1253 | kfree(ctx); | |
1254 | } | |
1255 | ||
1256 | static void | |
1257 | gss_free_ctx_callback(struct rcu_head *head) | |
1258 | { | |
1259 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
1260 | gss_do_free_ctx(ctx); | |
1261 | } | |
1262 | ||
1263 | static void | |
1264 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
1265 | { | |
1266 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); | |
1267 | } | |
1268 | ||
1269 | static void | |
1270 | gss_free_cred(struct gss_cred *gss_cred) | |
1271 | { | |
1272 | dprintk("RPC: %s cred=%p\n", __func__, gss_cred); | |
1273 | kfree(gss_cred); | |
1274 | } | |
1275 | ||
1276 | static void | |
1277 | gss_free_cred_callback(struct rcu_head *head) | |
1278 | { | |
1279 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
1280 | gss_free_cred(gss_cred); | |
1281 | } | |
1282 | ||
1283 | static void | |
1284 | gss_destroy_nullcred(struct rpc_cred *cred) | |
1285 | { | |
1286 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1287 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
1288 | struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1); | |
1289 | ||
1290 | RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); | |
1291 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); | |
1292 | if (ctx) | |
1293 | gss_put_ctx(ctx); | |
1294 | gss_put_auth(gss_auth); | |
1295 | } | |
1296 | ||
1297 | static void | |
1298 | gss_destroy_cred(struct rpc_cred *cred) | |
1299 | { | |
1300 | ||
1301 | if (gss_destroying_context(cred)) | |
1302 | return; | |
1303 | gss_destroy_nullcred(cred); | |
1304 | } | |
1305 | ||
1306 | static int | |
1307 | gss_hash_cred(struct auth_cred *acred, unsigned int hashbits) | |
1308 | { | |
1309 | return hash_64(from_kuid(&init_user_ns, acred->uid), hashbits); | |
1310 | } | |
1311 | ||
1312 | /* | |
1313 | * Lookup RPCSEC_GSS cred for the current process | |
1314 | */ | |
1315 | static struct rpc_cred * | |
1316 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) | |
1317 | { | |
1318 | return rpcauth_lookup_credcache(auth, acred, flags, GFP_NOFS); | |
1319 | } | |
1320 | ||
1321 | static struct rpc_cred * | |
1322 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp) | |
1323 | { | |
1324 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1325 | struct gss_cred *cred = NULL; | |
1326 | int err = -ENOMEM; | |
1327 | ||
1328 | dprintk("RPC: %s for uid %d, flavor %d\n", | |
1329 | __func__, from_kuid(&init_user_ns, acred->uid), | |
1330 | auth->au_flavor); | |
1331 | ||
1332 | if (!(cred = kzalloc(sizeof(*cred), gfp))) | |
1333 | goto out_err; | |
1334 | ||
1335 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); | |
1336 | /* | |
1337 | * Note: in order to force a call to call_refresh(), we deliberately | |
1338 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
1339 | */ | |
1340 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; | |
1341 | cred->gc_service = gss_auth->service; | |
1342 | cred->gc_principal = NULL; | |
1343 | if (acred->machine_cred) | |
1344 | cred->gc_principal = acred->principal; | |
1345 | kref_get(&gss_auth->kref); | |
1346 | return &cred->gc_base; | |
1347 | ||
1348 | out_err: | |
1349 | dprintk("RPC: %s failed with error %d\n", __func__, err); | |
1350 | return ERR_PTR(err); | |
1351 | } | |
1352 | ||
1353 | static int | |
1354 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
1355 | { | |
1356 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1357 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
1358 | int err; | |
1359 | ||
1360 | do { | |
1361 | err = gss_create_upcall(gss_auth, gss_cred); | |
1362 | } while (err == -EAGAIN); | |
1363 | return err; | |
1364 | } | |
1365 | ||
1366 | static char * | |
1367 | gss_stringify_acceptor(struct rpc_cred *cred) | |
1368 | { | |
1369 | char *string = NULL; | |
1370 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1371 | struct gss_cl_ctx *ctx; | |
1372 | unsigned int len; | |
1373 | struct xdr_netobj *acceptor; | |
1374 | ||
1375 | rcu_read_lock(); | |
1376 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
1377 | if (!ctx) | |
1378 | goto out; | |
1379 | ||
1380 | len = ctx->gc_acceptor.len; | |
1381 | rcu_read_unlock(); | |
1382 | ||
1383 | /* no point if there's no string */ | |
1384 | if (!len) | |
1385 | return NULL; | |
1386 | realloc: | |
1387 | string = kmalloc(len + 1, GFP_KERNEL); | |
1388 | if (!string) | |
1389 | return NULL; | |
1390 | ||
1391 | rcu_read_lock(); | |
1392 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
1393 | ||
1394 | /* did the ctx disappear or was it replaced by one with no acceptor? */ | |
1395 | if (!ctx || !ctx->gc_acceptor.len) { | |
1396 | kfree(string); | |
1397 | string = NULL; | |
1398 | goto out; | |
1399 | } | |
1400 | ||
1401 | acceptor = &ctx->gc_acceptor; | |
1402 | ||
1403 | /* | |
1404 | * Did we find a new acceptor that's longer than the original? Allocate | |
1405 | * a longer buffer and try again. | |
1406 | */ | |
1407 | if (len < acceptor->len) { | |
1408 | len = acceptor->len; | |
1409 | rcu_read_unlock(); | |
1410 | kfree(string); | |
1411 | goto realloc; | |
1412 | } | |
1413 | ||
1414 | memcpy(string, acceptor->data, acceptor->len); | |
1415 | string[acceptor->len] = '\0'; | |
1416 | out: | |
1417 | rcu_read_unlock(); | |
1418 | return string; | |
1419 | } | |
1420 | ||
1421 | /* | |
1422 | * Returns -EACCES if GSS context is NULL or will expire within the | |
1423 | * timeout (miliseconds) | |
1424 | */ | |
1425 | static int | |
1426 | gss_key_timeout(struct rpc_cred *rc) | |
1427 | { | |
1428 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
1429 | struct gss_cl_ctx *ctx; | |
1430 | unsigned long timeout = jiffies + (gss_key_expire_timeo * HZ); | |
1431 | int ret = 0; | |
1432 | ||
1433 | rcu_read_lock(); | |
1434 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
1435 | if (!ctx || time_after(timeout, ctx->gc_expiry)) | |
1436 | ret = -EACCES; | |
1437 | rcu_read_unlock(); | |
1438 | ||
1439 | return ret; | |
1440 | } | |
1441 | ||
1442 | static int | |
1443 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) | |
1444 | { | |
1445 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
1446 | struct gss_cl_ctx *ctx; | |
1447 | int ret; | |
1448 | ||
1449 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) | |
1450 | goto out; | |
1451 | /* Don't match with creds that have expired. */ | |
1452 | rcu_read_lock(); | |
1453 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
1454 | if (!ctx || time_after(jiffies, ctx->gc_expiry)) { | |
1455 | rcu_read_unlock(); | |
1456 | return 0; | |
1457 | } | |
1458 | rcu_read_unlock(); | |
1459 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1460 | return 0; | |
1461 | out: | |
1462 | if (acred->principal != NULL) { | |
1463 | if (gss_cred->gc_principal == NULL) | |
1464 | return 0; | |
1465 | ret = strcmp(acred->principal, gss_cred->gc_principal) == 0; | |
1466 | goto check_expire; | |
1467 | } | |
1468 | if (gss_cred->gc_principal != NULL) | |
1469 | return 0; | |
1470 | ret = uid_eq(rc->cr_uid, acred->uid); | |
1471 | ||
1472 | check_expire: | |
1473 | if (ret == 0) | |
1474 | return ret; | |
1475 | ||
1476 | /* Notify acred users of GSS context expiration timeout */ | |
1477 | if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) && | |
1478 | (gss_key_timeout(rc) != 0)) { | |
1479 | /* test will now be done from generic cred */ | |
1480 | test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags); | |
1481 | /* tell NFS layer that key will expire soon */ | |
1482 | set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags); | |
1483 | } | |
1484 | return ret; | |
1485 | } | |
1486 | ||
1487 | /* | |
1488 | * Marshal credentials. | |
1489 | * Maybe we should keep a cached credential for performance reasons. | |
1490 | */ | |
1491 | static __be32 * | |
1492 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1493 | { | |
1494 | struct rpc_rqst *req = task->tk_rqstp; | |
1495 | struct rpc_cred *cred = req->rq_cred; | |
1496 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1497 | gc_base); | |
1498 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1499 | __be32 *cred_len; | |
1500 | u32 maj_stat = 0; | |
1501 | struct xdr_netobj mic; | |
1502 | struct kvec iov; | |
1503 | struct xdr_buf verf_buf; | |
1504 | ||
1505 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); | |
1506 | ||
1507 | *p++ = htonl(RPC_AUTH_GSS); | |
1508 | cred_len = p++; | |
1509 | ||
1510 | spin_lock(&ctx->gc_seq_lock); | |
1511 | req->rq_seqno = ctx->gc_seq++; | |
1512 | spin_unlock(&ctx->gc_seq_lock); | |
1513 | ||
1514 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
1515 | *p++ = htonl((u32) ctx->gc_proc); | |
1516 | *p++ = htonl((u32) req->rq_seqno); | |
1517 | *p++ = htonl((u32) gss_cred->gc_service); | |
1518 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
1519 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
1520 | ||
1521 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
1522 | * starting with the xid and ending at the end of the credential: */ | |
1523 | iov.iov_base = xprt_skip_transport_header(req->rq_xprt, | |
1524 | req->rq_snd_buf.head[0].iov_base); | |
1525 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; | |
1526 | xdr_buf_from_iov(&iov, &verf_buf); | |
1527 | ||
1528 | /* set verifier flavor*/ | |
1529 | *p++ = htonl(RPC_AUTH_GSS); | |
1530 | ||
1531 | mic.data = (u8 *)(p + 1); | |
1532 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); | |
1533 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { | |
1534 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); | |
1535 | } else if (maj_stat != 0) { | |
1536 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
1537 | goto out_put_ctx; | |
1538 | } | |
1539 | p = xdr_encode_opaque(p, NULL, mic.len); | |
1540 | gss_put_ctx(ctx); | |
1541 | return p; | |
1542 | out_put_ctx: | |
1543 | gss_put_ctx(ctx); | |
1544 | return NULL; | |
1545 | } | |
1546 | ||
1547 | static int gss_renew_cred(struct rpc_task *task) | |
1548 | { | |
1549 | struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; | |
1550 | struct gss_cred *gss_cred = container_of(oldcred, | |
1551 | struct gss_cred, | |
1552 | gc_base); | |
1553 | struct rpc_auth *auth = oldcred->cr_auth; | |
1554 | struct auth_cred acred = { | |
1555 | .uid = oldcred->cr_uid, | |
1556 | .principal = gss_cred->gc_principal, | |
1557 | .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), | |
1558 | }; | |
1559 | struct rpc_cred *new; | |
1560 | ||
1561 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
1562 | if (IS_ERR(new)) | |
1563 | return PTR_ERR(new); | |
1564 | task->tk_rqstp->rq_cred = new; | |
1565 | put_rpccred(oldcred); | |
1566 | return 0; | |
1567 | } | |
1568 | ||
1569 | static int gss_cred_is_negative_entry(struct rpc_cred *cred) | |
1570 | { | |
1571 | if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { | |
1572 | unsigned long now = jiffies; | |
1573 | unsigned long begin, expire; | |
1574 | struct gss_cred *gss_cred; | |
1575 | ||
1576 | gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1577 | begin = gss_cred->gc_upcall_timestamp; | |
1578 | expire = begin + gss_expired_cred_retry_delay * HZ; | |
1579 | ||
1580 | if (time_in_range_open(now, begin, expire)) | |
1581 | return 1; | |
1582 | } | |
1583 | return 0; | |
1584 | } | |
1585 | ||
1586 | /* | |
1587 | * Refresh credentials. XXX - finish | |
1588 | */ | |
1589 | static int | |
1590 | gss_refresh(struct rpc_task *task) | |
1591 | { | |
1592 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; | |
1593 | int ret = 0; | |
1594 | ||
1595 | if (gss_cred_is_negative_entry(cred)) | |
1596 | return -EKEYEXPIRED; | |
1597 | ||
1598 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && | |
1599 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
1600 | ret = gss_renew_cred(task); | |
1601 | if (ret < 0) | |
1602 | goto out; | |
1603 | cred = task->tk_rqstp->rq_cred; | |
1604 | } | |
1605 | ||
1606 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) | |
1607 | ret = gss_refresh_upcall(task); | |
1608 | out: | |
1609 | return ret; | |
1610 | } | |
1611 | ||
1612 | /* Dummy refresh routine: used only when destroying the context */ | |
1613 | static int | |
1614 | gss_refresh_null(struct rpc_task *task) | |
1615 | { | |
1616 | return 0; | |
1617 | } | |
1618 | ||
1619 | static __be32 * | |
1620 | gss_validate(struct rpc_task *task, __be32 *p) | |
1621 | { | |
1622 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; | |
1623 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1624 | __be32 *seq = NULL; | |
1625 | struct kvec iov; | |
1626 | struct xdr_buf verf_buf; | |
1627 | struct xdr_netobj mic; | |
1628 | u32 flav,len; | |
1629 | u32 maj_stat; | |
1630 | __be32 *ret = ERR_PTR(-EIO); | |
1631 | ||
1632 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); | |
1633 | ||
1634 | flav = ntohl(*p++); | |
1635 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
1636 | goto out_bad; | |
1637 | if (flav != RPC_AUTH_GSS) | |
1638 | goto out_bad; | |
1639 | seq = kmalloc(4, GFP_NOFS); | |
1640 | if (!seq) | |
1641 | goto out_bad; | |
1642 | *seq = htonl(task->tk_rqstp->rq_seqno); | |
1643 | iov.iov_base = seq; | |
1644 | iov.iov_len = 4; | |
1645 | xdr_buf_from_iov(&iov, &verf_buf); | |
1646 | mic.data = (u8 *)p; | |
1647 | mic.len = len; | |
1648 | ||
1649 | ret = ERR_PTR(-EACCES); | |
1650 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); | |
1651 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
1652 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); | |
1653 | if (maj_stat) { | |
1654 | dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", | |
1655 | task->tk_pid, __func__, maj_stat); | |
1656 | goto out_bad; | |
1657 | } | |
1658 | /* We leave it to unwrap to calculate au_rslack. For now we just | |
1659 | * calculate the length of the verifier: */ | |
1660 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; | |
1661 | gss_put_ctx(ctx); | |
1662 | dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", | |
1663 | task->tk_pid, __func__); | |
1664 | kfree(seq); | |
1665 | return p + XDR_QUADLEN(len); | |
1666 | out_bad: | |
1667 | gss_put_ctx(ctx); | |
1668 | dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__, | |
1669 | PTR_ERR(ret)); | |
1670 | kfree(seq); | |
1671 | return ret; | |
1672 | } | |
1673 | ||
1674 | static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, | |
1675 | __be32 *p, void *obj) | |
1676 | { | |
1677 | struct xdr_stream xdr; | |
1678 | ||
1679 | xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); | |
1680 | encode(rqstp, &xdr, obj); | |
1681 | } | |
1682 | ||
1683 | static inline int | |
1684 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
1685 | kxdreproc_t encode, struct rpc_rqst *rqstp, | |
1686 | __be32 *p, void *obj) | |
1687 | { | |
1688 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1689 | struct xdr_buf integ_buf; | |
1690 | __be32 *integ_len = NULL; | |
1691 | struct xdr_netobj mic; | |
1692 | u32 offset; | |
1693 | __be32 *q; | |
1694 | struct kvec *iov; | |
1695 | u32 maj_stat = 0; | |
1696 | int status = -EIO; | |
1697 | ||
1698 | integ_len = p++; | |
1699 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1700 | *p++ = htonl(rqstp->rq_seqno); | |
1701 | ||
1702 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1703 | ||
1704 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1705 | offset, snd_buf->len - offset)) | |
1706 | return status; | |
1707 | *integ_len = htonl(integ_buf.len); | |
1708 | ||
1709 | /* guess whether we're in the head or the tail: */ | |
1710 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1711 | iov = snd_buf->tail; | |
1712 | else | |
1713 | iov = snd_buf->head; | |
1714 | p = iov->iov_base + iov->iov_len; | |
1715 | mic.data = (u8 *)(p + 1); | |
1716 | ||
1717 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); | |
1718 | status = -EIO; /* XXX? */ | |
1719 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
1720 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); | |
1721 | else if (maj_stat) | |
1722 | return status; | |
1723 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1724 | ||
1725 | offset = (u8 *)q - (u8 *)p; | |
1726 | iov->iov_len += offset; | |
1727 | snd_buf->len += offset; | |
1728 | return 0; | |
1729 | } | |
1730 | ||
1731 | static void | |
1732 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1733 | { | |
1734 | int i; | |
1735 | ||
1736 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1737 | __free_page(rqstp->rq_enc_pages[i]); | |
1738 | kfree(rqstp->rq_enc_pages); | |
1739 | } | |
1740 | ||
1741 | static int | |
1742 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1743 | { | |
1744 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1745 | int first, last, i; | |
1746 | ||
1747 | if (snd_buf->page_len == 0) { | |
1748 | rqstp->rq_enc_pages_num = 0; | |
1749 | return 0; | |
1750 | } | |
1751 | ||
1752 | first = snd_buf->page_base >> PAGE_SHIFT; | |
1753 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_SHIFT; | |
1754 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1755 | rqstp->rq_enc_pages | |
1756 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1757 | GFP_NOFS); | |
1758 | if (!rqstp->rq_enc_pages) | |
1759 | goto out; | |
1760 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1761 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1762 | if (rqstp->rq_enc_pages[i] == NULL) | |
1763 | goto out_free; | |
1764 | } | |
1765 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1766 | return 0; | |
1767 | out_free: | |
1768 | rqstp->rq_enc_pages_num = i; | |
1769 | priv_release_snd_buf(rqstp); | |
1770 | out: | |
1771 | return -EAGAIN; | |
1772 | } | |
1773 | ||
1774 | static inline int | |
1775 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
1776 | kxdreproc_t encode, struct rpc_rqst *rqstp, | |
1777 | __be32 *p, void *obj) | |
1778 | { | |
1779 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1780 | u32 offset; | |
1781 | u32 maj_stat; | |
1782 | int status; | |
1783 | __be32 *opaque_len; | |
1784 | struct page **inpages; | |
1785 | int first; | |
1786 | int pad; | |
1787 | struct kvec *iov; | |
1788 | char *tmp; | |
1789 | ||
1790 | opaque_len = p++; | |
1791 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1792 | *p++ = htonl(rqstp->rq_seqno); | |
1793 | ||
1794 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1795 | ||
1796 | status = alloc_enc_pages(rqstp); | |
1797 | if (status) | |
1798 | return status; | |
1799 | first = snd_buf->page_base >> PAGE_SHIFT; | |
1800 | inpages = snd_buf->pages + first; | |
1801 | snd_buf->pages = rqstp->rq_enc_pages; | |
1802 | snd_buf->page_base -= first << PAGE_SHIFT; | |
1803 | /* | |
1804 | * Give the tail its own page, in case we need extra space in the | |
1805 | * head when wrapping: | |
1806 | * | |
1807 | * call_allocate() allocates twice the slack space required | |
1808 | * by the authentication flavor to rq_callsize. | |
1809 | * For GSS, slack is GSS_CRED_SLACK. | |
1810 | */ | |
1811 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { | |
1812 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1813 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1814 | snd_buf->tail[0].iov_base = tmp; | |
1815 | } | |
1816 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); | |
1817 | /* slack space should prevent this ever happening: */ | |
1818 | BUG_ON(snd_buf->len > snd_buf->buflen); | |
1819 | status = -EIO; | |
1820 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was | |
1821 | * done anyway, so it's safe to put the request on the wire: */ | |
1822 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
1823 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); | |
1824 | else if (maj_stat) | |
1825 | return status; | |
1826 | ||
1827 | *opaque_len = htonl(snd_buf->len - offset); | |
1828 | /* guess whether we're in the head or the tail: */ | |
1829 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1830 | iov = snd_buf->tail; | |
1831 | else | |
1832 | iov = snd_buf->head; | |
1833 | p = iov->iov_base + iov->iov_len; | |
1834 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1835 | memset(p, 0, pad); | |
1836 | iov->iov_len += pad; | |
1837 | snd_buf->len += pad; | |
1838 | ||
1839 | return 0; | |
1840 | } | |
1841 | ||
1842 | static int | |
1843 | gss_wrap_req(struct rpc_task *task, | |
1844 | kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) | |
1845 | { | |
1846 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; | |
1847 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1848 | gc_base); | |
1849 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1850 | int status = -EIO; | |
1851 | ||
1852 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); | |
1853 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { | |
1854 | /* The spec seems a little ambiguous here, but I think that not | |
1855 | * wrapping context destruction requests makes the most sense. | |
1856 | */ | |
1857 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1858 | status = 0; | |
1859 | goto out; | |
1860 | } | |
1861 | switch (gss_cred->gc_service) { | |
1862 | case RPC_GSS_SVC_NONE: | |
1863 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1864 | status = 0; | |
1865 | break; | |
1866 | case RPC_GSS_SVC_INTEGRITY: | |
1867 | status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); | |
1868 | break; | |
1869 | case RPC_GSS_SVC_PRIVACY: | |
1870 | status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); | |
1871 | break; | |
1872 | } | |
1873 | out: | |
1874 | gss_put_ctx(ctx); | |
1875 | dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); | |
1876 | return status; | |
1877 | } | |
1878 | ||
1879 | static inline int | |
1880 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
1881 | struct rpc_rqst *rqstp, __be32 **p) | |
1882 | { | |
1883 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1884 | struct xdr_buf integ_buf; | |
1885 | struct xdr_netobj mic; | |
1886 | u32 data_offset, mic_offset; | |
1887 | u32 integ_len; | |
1888 | u32 maj_stat; | |
1889 | int status = -EIO; | |
1890 | ||
1891 | integ_len = ntohl(*(*p)++); | |
1892 | if (integ_len & 3) | |
1893 | return status; | |
1894 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1895 | mic_offset = integ_len + data_offset; | |
1896 | if (mic_offset > rcv_buf->len) | |
1897 | return status; | |
1898 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1899 | return status; | |
1900 | ||
1901 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1902 | mic_offset - data_offset)) | |
1903 | return status; | |
1904 | ||
1905 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1906 | return status; | |
1907 | ||
1908 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); | |
1909 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
1910 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); | |
1911 | if (maj_stat != GSS_S_COMPLETE) | |
1912 | return status; | |
1913 | return 0; | |
1914 | } | |
1915 | ||
1916 | static inline int | |
1917 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
1918 | struct rpc_rqst *rqstp, __be32 **p) | |
1919 | { | |
1920 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1921 | u32 offset; | |
1922 | u32 opaque_len; | |
1923 | u32 maj_stat; | |
1924 | int status = -EIO; | |
1925 | ||
1926 | opaque_len = ntohl(*(*p)++); | |
1927 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1928 | if (offset + opaque_len > rcv_buf->len) | |
1929 | return status; | |
1930 | /* remove padding: */ | |
1931 | rcv_buf->len = offset + opaque_len; | |
1932 | ||
1933 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); | |
1934 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
1935 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); | |
1936 | if (maj_stat != GSS_S_COMPLETE) | |
1937 | return status; | |
1938 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1939 | return status; | |
1940 | ||
1941 | return 0; | |
1942 | } | |
1943 | ||
1944 | static int | |
1945 | gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, | |
1946 | __be32 *p, void *obj) | |
1947 | { | |
1948 | struct xdr_stream xdr; | |
1949 | ||
1950 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
1951 | return decode(rqstp, &xdr, obj); | |
1952 | } | |
1953 | ||
1954 | static int | |
1955 | gss_unwrap_resp(struct rpc_task *task, | |
1956 | kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) | |
1957 | { | |
1958 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; | |
1959 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1960 | gc_base); | |
1961 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1962 | __be32 *savedp = p; | |
1963 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; | |
1964 | int savedlen = head->iov_len; | |
1965 | int status = -EIO; | |
1966 | ||
1967 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1968 | goto out_decode; | |
1969 | switch (gss_cred->gc_service) { | |
1970 | case RPC_GSS_SVC_NONE: | |
1971 | break; | |
1972 | case RPC_GSS_SVC_INTEGRITY: | |
1973 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1974 | if (status) | |
1975 | goto out; | |
1976 | break; | |
1977 | case RPC_GSS_SVC_PRIVACY: | |
1978 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); | |
1979 | if (status) | |
1980 | goto out; | |
1981 | break; | |
1982 | } | |
1983 | /* take into account extra slack for integrity and privacy cases: */ | |
1984 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) | |
1985 | + (savedlen - head->iov_len); | |
1986 | out_decode: | |
1987 | status = gss_unwrap_req_decode(decode, rqstp, p, obj); | |
1988 | out: | |
1989 | gss_put_ctx(ctx); | |
1990 | dprintk("RPC: %5u %s returning %d\n", | |
1991 | task->tk_pid, __func__, status); | |
1992 | return status; | |
1993 | } | |
1994 | ||
1995 | static const struct rpc_authops authgss_ops = { | |
1996 | .owner = THIS_MODULE, | |
1997 | .au_flavor = RPC_AUTH_GSS, | |
1998 | .au_name = "RPCSEC_GSS", | |
1999 | .create = gss_create, | |
2000 | .destroy = gss_destroy, | |
2001 | .hash_cred = gss_hash_cred, | |
2002 | .lookup_cred = gss_lookup_cred, | |
2003 | .crcreate = gss_create_cred, | |
2004 | .list_pseudoflavors = gss_mech_list_pseudoflavors, | |
2005 | .info2flavor = gss_mech_info2flavor, | |
2006 | .flavor2info = gss_mech_flavor2info, | |
2007 | }; | |
2008 | ||
2009 | static const struct rpc_credops gss_credops = { | |
2010 | .cr_name = "AUTH_GSS", | |
2011 | .crdestroy = gss_destroy_cred, | |
2012 | .cr_init = gss_cred_init, | |
2013 | .crbind = rpcauth_generic_bind_cred, | |
2014 | .crmatch = gss_match, | |
2015 | .crmarshal = gss_marshal, | |
2016 | .crrefresh = gss_refresh, | |
2017 | .crvalidate = gss_validate, | |
2018 | .crwrap_req = gss_wrap_req, | |
2019 | .crunwrap_resp = gss_unwrap_resp, | |
2020 | .crkey_timeout = gss_key_timeout, | |
2021 | .crstringify_acceptor = gss_stringify_acceptor, | |
2022 | }; | |
2023 | ||
2024 | static const struct rpc_credops gss_nullops = { | |
2025 | .cr_name = "AUTH_GSS", | |
2026 | .crdestroy = gss_destroy_nullcred, | |
2027 | .crbind = rpcauth_generic_bind_cred, | |
2028 | .crmatch = gss_match, | |
2029 | .crmarshal = gss_marshal, | |
2030 | .crrefresh = gss_refresh_null, | |
2031 | .crvalidate = gss_validate, | |
2032 | .crwrap_req = gss_wrap_req, | |
2033 | .crunwrap_resp = gss_unwrap_resp, | |
2034 | .crstringify_acceptor = gss_stringify_acceptor, | |
2035 | }; | |
2036 | ||
2037 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { | |
2038 | .upcall = rpc_pipe_generic_upcall, | |
2039 | .downcall = gss_pipe_downcall, | |
2040 | .destroy_msg = gss_pipe_destroy_msg, | |
2041 | .open_pipe = gss_pipe_open_v0, | |
2042 | .release_pipe = gss_pipe_release, | |
2043 | }; | |
2044 | ||
2045 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { | |
2046 | .upcall = rpc_pipe_generic_upcall, | |
2047 | .downcall = gss_pipe_downcall, | |
2048 | .destroy_msg = gss_pipe_destroy_msg, | |
2049 | .open_pipe = gss_pipe_open_v1, | |
2050 | .release_pipe = gss_pipe_release, | |
2051 | }; | |
2052 | ||
2053 | static __net_init int rpcsec_gss_init_net(struct net *net) | |
2054 | { | |
2055 | return gss_svc_init_net(net); | |
2056 | } | |
2057 | ||
2058 | static __net_exit void rpcsec_gss_exit_net(struct net *net) | |
2059 | { | |
2060 | gss_svc_shutdown_net(net); | |
2061 | } | |
2062 | ||
2063 | static struct pernet_operations rpcsec_gss_net_ops = { | |
2064 | .init = rpcsec_gss_init_net, | |
2065 | .exit = rpcsec_gss_exit_net, | |
2066 | }; | |
2067 | ||
2068 | /* | |
2069 | * Initialize RPCSEC_GSS module | |
2070 | */ | |
2071 | static int __init init_rpcsec_gss(void) | |
2072 | { | |
2073 | int err = 0; | |
2074 | ||
2075 | err = rpcauth_register(&authgss_ops); | |
2076 | if (err) | |
2077 | goto out; | |
2078 | err = gss_svc_init(); | |
2079 | if (err) | |
2080 | goto out_unregister; | |
2081 | err = register_pernet_subsys(&rpcsec_gss_net_ops); | |
2082 | if (err) | |
2083 | goto out_svc_exit; | |
2084 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); | |
2085 | return 0; | |
2086 | out_svc_exit: | |
2087 | gss_svc_shutdown(); | |
2088 | out_unregister: | |
2089 | rpcauth_unregister(&authgss_ops); | |
2090 | out: | |
2091 | return err; | |
2092 | } | |
2093 | ||
2094 | static void __exit exit_rpcsec_gss(void) | |
2095 | { | |
2096 | unregister_pernet_subsys(&rpcsec_gss_net_ops); | |
2097 | gss_svc_shutdown(); | |
2098 | rpcauth_unregister(&authgss_ops); | |
2099 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
2100 | } | |
2101 | ||
2102 | MODULE_ALIAS("rpc-auth-6"); | |
2103 | MODULE_LICENSE("GPL"); | |
2104 | module_param_named(expired_cred_retry_delay, | |
2105 | gss_expired_cred_retry_delay, | |
2106 | uint, 0644); | |
2107 | MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " | |
2108 | "the RPC engine retries an expired credential"); | |
2109 | ||
2110 | module_param_named(key_expire_timeo, | |
2111 | gss_key_expire_timeo, | |
2112 | uint, 0644); | |
2113 | MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a " | |
2114 | "credential keys lifetime where the NFS layer cleans up " | |
2115 | "prior to key expiration"); | |
2116 | ||
2117 | module_init(init_rpcsec_gss) | |
2118 | module_exit(exit_rpcsec_gss) |