This source file includes following definitions.
- gss_get_ctx
- gss_put_ctx
- gss_cred_set_ctx
- simple_get_bytes
- simple_get_netobj
- gss_cred_get_ctx
- gss_alloc_context
- gss_fill_context
- get_pipe_version
- put_pipe_version
- gss_release_msg
- __gss_find_upcall
- gss_add_msg
- __gss_unhash_msg
- gss_unhash_msg
- gss_handle_downcall_result
- gss_upcall_callback
- gss_encode_v0_msg
- gss_v0_upcall
- gss_encode_v1_msg
- gss_v1_upcall
- gss_alloc_msg
- gss_setup_upcall
- warn_gssd
- gss_refresh_upcall
- gss_create_upcall
- gss_pipe_downcall
- gss_pipe_open
- gss_pipe_open_v0
- gss_pipe_open_v1
- gss_pipe_release
- gss_pipe_destroy_msg
- gss_pipe_dentry_destroy
- gss_pipe_dentry_create
- gss_pipe_alloc
- gss_pipe_match_pdo
- gss_pipe_alloc_pdo
- gss_pipe_get
- __gss_pipe_free
- __gss_pipe_release
- gss_pipe_free
- gss_create_new
- gss_free
- gss_free_callback
- gss_put_auth
- gss_destroy
- gss_auth_find_or_add_hashed
- gss_create_hashed
- gss_create
- gss_dup_cred
- gss_send_destroy_context
- gss_do_free_ctx
- gss_free_ctx_callback
- gss_free_ctx
- gss_free_cred
- gss_free_cred_callback
- gss_destroy_nullcred
- gss_destroy_cred
- gss_hash_cred
- gss_lookup_cred
- gss_create_cred
- gss_cred_init
- gss_stringify_acceptor
- gss_key_timeout
- gss_match
- gss_marshal
- gss_renew_cred
- gss_cred_is_negative_entry
- gss_refresh
- gss_refresh_null
- gss_validate
- gss_wrap_req_integ
- priv_release_snd_buf
- alloc_enc_pages
- gss_wrap_req_priv
- gss_wrap_req
- gss_unwrap_resp_auth
- gss_unwrap_resp_integ
- gss_unwrap_resp_priv
- gss_seq_is_newer
- gss_xmit_need_reencode
- gss_unwrap_resp
- rpcsec_gss_init_net
- rpcsec_gss_exit_net
- init_rpcsec_gss
- exit_rpcsec_gss
1
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13
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/sched.h>
19 #include <linux/pagemap.h>
20 #include <linux/sunrpc/clnt.h>
21 #include <linux/sunrpc/auth.h>
22 #include <linux/sunrpc/auth_gss.h>
23 #include <linux/sunrpc/gss_krb5.h>
24 #include <linux/sunrpc/svcauth_gss.h>
25 #include <linux/sunrpc/gss_err.h>
26 #include <linux/workqueue.h>
27 #include <linux/sunrpc/rpc_pipe_fs.h>
28 #include <linux/sunrpc/gss_api.h>
29 #include <linux/uaccess.h>
30 #include <linux/hashtable.h>
31
32 #include "../netns.h"
33
34 #include <trace/events/rpcgss.h>
35
36 static const struct rpc_authops authgss_ops;
37
38 static const struct rpc_credops gss_credops;
39 static const struct rpc_credops gss_nullops;
40
41 #define GSS_RETRY_EXPIRED 5
42 static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;
43
44 #define GSS_KEY_EXPIRE_TIMEO 240
45 static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO;
46
47 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
48 # define RPCDBG_FACILITY RPCDBG_AUTH
49 #endif
50
51 #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2)
52
53
54 #define GSS_VERF_SLACK 100
55
56 static DEFINE_HASHTABLE(gss_auth_hash_table, 4);
57 static DEFINE_SPINLOCK(gss_auth_hash_lock);
58
59 struct gss_pipe {
60 struct rpc_pipe_dir_object pdo;
61 struct rpc_pipe *pipe;
62 struct rpc_clnt *clnt;
63 const char *name;
64 struct kref kref;
65 };
66
67 struct gss_auth {
68 struct kref kref;
69 struct hlist_node hash;
70 struct rpc_auth rpc_auth;
71 struct gss_api_mech *mech;
72 enum rpc_gss_svc service;
73 struct rpc_clnt *client;
74 struct net *net;
75
76
77
78
79
80
81 struct gss_pipe *gss_pipe[2];
82 const char *target_name;
83 };
84
85
86 static DEFINE_SPINLOCK(pipe_version_lock);
87 static struct rpc_wait_queue pipe_version_rpc_waitqueue;
88 static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
89 static void gss_put_auth(struct gss_auth *gss_auth);
90
91 static void gss_free_ctx(struct gss_cl_ctx *);
92 static const struct rpc_pipe_ops gss_upcall_ops_v0;
93 static const struct rpc_pipe_ops gss_upcall_ops_v1;
94
95 static inline struct gss_cl_ctx *
96 gss_get_ctx(struct gss_cl_ctx *ctx)
97 {
98 refcount_inc(&ctx->count);
99 return ctx;
100 }
101
102 static inline void
103 gss_put_ctx(struct gss_cl_ctx *ctx)
104 {
105 if (refcount_dec_and_test(&ctx->count))
106 gss_free_ctx(ctx);
107 }
108
109
110
111
112
113
114 static void
115 gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
116 {
117 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
118
119 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
120 return;
121 gss_get_ctx(ctx);
122 rcu_assign_pointer(gss_cred->gc_ctx, ctx);
123 set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
124 smp_mb__before_atomic();
125 clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
126 }
127
128 static const void *
129 simple_get_bytes(const void *p, const void *end, void *res, size_t len)
130 {
131 const void *q = (const void *)((const char *)p + len);
132 if (unlikely(q > end || q < p))
133 return ERR_PTR(-EFAULT);
134 memcpy(res, p, len);
135 return q;
136 }
137
138 static inline const void *
139 simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
140 {
141 const void *q;
142 unsigned int len;
143
144 p = simple_get_bytes(p, end, &len, sizeof(len));
145 if (IS_ERR(p))
146 return p;
147 q = (const void *)((const char *)p + len);
148 if (unlikely(q > end || q < p))
149 return ERR_PTR(-EFAULT);
150 dest->data = kmemdup(p, len, GFP_NOFS);
151 if (unlikely(dest->data == NULL))
152 return ERR_PTR(-ENOMEM);
153 dest->len = len;
154 return q;
155 }
156
157 static struct gss_cl_ctx *
158 gss_cred_get_ctx(struct rpc_cred *cred)
159 {
160 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
161 struct gss_cl_ctx *ctx = NULL;
162
163 rcu_read_lock();
164 ctx = rcu_dereference(gss_cred->gc_ctx);
165 if (ctx)
166 gss_get_ctx(ctx);
167 rcu_read_unlock();
168 return ctx;
169 }
170
171 static struct gss_cl_ctx *
172 gss_alloc_context(void)
173 {
174 struct gss_cl_ctx *ctx;
175
176 ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
177 if (ctx != NULL) {
178 ctx->gc_proc = RPC_GSS_PROC_DATA;
179 ctx->gc_seq = 1;
180 spin_lock_init(&ctx->gc_seq_lock);
181 refcount_set(&ctx->count,1);
182 }
183 return ctx;
184 }
185
186 #define GSSD_MIN_TIMEOUT (60 * 60)
187 static const void *
188 gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
189 {
190 const void *q;
191 unsigned int seclen;
192 unsigned int timeout;
193 unsigned long now = jiffies;
194 u32 window_size;
195 int ret;
196
197
198
199
200
201 p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
202 if (IS_ERR(p))
203 goto err;
204 if (timeout == 0)
205 timeout = GSSD_MIN_TIMEOUT;
206 ctx->gc_expiry = now + ((unsigned long)timeout * HZ);
207
208
209
210 p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
211 if (IS_ERR(p))
212 goto err;
213 ctx->gc_win = window_size;
214
215 if (ctx->gc_win == 0) {
216
217
218
219
220 p = simple_get_bytes(p, end, &ret, sizeof(ret));
221 if (!IS_ERR(p))
222 p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
223 ERR_PTR(-EACCES);
224 goto err;
225 }
226
227 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
228 if (IS_ERR(p))
229 goto err;
230
231 p = simple_get_bytes(p, end, &seclen, sizeof(seclen));
232 if (IS_ERR(p))
233 goto err;
234 q = (const void *)((const char *)p + seclen);
235 if (unlikely(q > end || q < p)) {
236 p = ERR_PTR(-EFAULT);
237 goto err;
238 }
239 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS);
240 if (ret < 0) {
241 trace_rpcgss_import_ctx(ret);
242 p = ERR_PTR(ret);
243 goto err;
244 }
245
246
247 if (q == end) {
248 p = q;
249 goto done;
250 }
251
252
253 p = simple_get_netobj(q, end, &ctx->gc_acceptor);
254 if (IS_ERR(p))
255 goto err;
256 done:
257 trace_rpcgss_context(ctx->gc_expiry, now, timeout,
258 ctx->gc_acceptor.len, ctx->gc_acceptor.data);
259 err:
260 return p;
261 }
262
263
264
265
266
267
268 #define UPCALL_BUF_LEN 256
269
270 struct gss_upcall_msg {
271 refcount_t count;
272 kuid_t uid;
273 const char *service_name;
274 struct rpc_pipe_msg msg;
275 struct list_head list;
276 struct gss_auth *auth;
277 struct rpc_pipe *pipe;
278 struct rpc_wait_queue rpc_waitqueue;
279 wait_queue_head_t waitqueue;
280 struct gss_cl_ctx *ctx;
281 char databuf[UPCALL_BUF_LEN];
282 };
283
284 static int get_pipe_version(struct net *net)
285 {
286 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
287 int ret;
288
289 spin_lock(&pipe_version_lock);
290 if (sn->pipe_version >= 0) {
291 atomic_inc(&sn->pipe_users);
292 ret = sn->pipe_version;
293 } else
294 ret = -EAGAIN;
295 spin_unlock(&pipe_version_lock);
296 return ret;
297 }
298
299 static void put_pipe_version(struct net *net)
300 {
301 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
302
303 if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) {
304 sn->pipe_version = -1;
305 spin_unlock(&pipe_version_lock);
306 }
307 }
308
309 static void
310 gss_release_msg(struct gss_upcall_msg *gss_msg)
311 {
312 struct net *net = gss_msg->auth->net;
313 if (!refcount_dec_and_test(&gss_msg->count))
314 return;
315 put_pipe_version(net);
316 BUG_ON(!list_empty(&gss_msg->list));
317 if (gss_msg->ctx != NULL)
318 gss_put_ctx(gss_msg->ctx);
319 rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
320 gss_put_auth(gss_msg->auth);
321 kfree_const(gss_msg->service_name);
322 kfree(gss_msg);
323 }
324
325 static struct gss_upcall_msg *
326 __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid, const struct gss_auth *auth)
327 {
328 struct gss_upcall_msg *pos;
329 list_for_each_entry(pos, &pipe->in_downcall, list) {
330 if (!uid_eq(pos->uid, uid))
331 continue;
332 if (auth && pos->auth->service != auth->service)
333 continue;
334 refcount_inc(&pos->count);
335 return pos;
336 }
337 return NULL;
338 }
339
340
341
342
343
344 static inline struct gss_upcall_msg *
345 gss_add_msg(struct gss_upcall_msg *gss_msg)
346 {
347 struct rpc_pipe *pipe = gss_msg->pipe;
348 struct gss_upcall_msg *old;
349
350 spin_lock(&pipe->lock);
351 old = __gss_find_upcall(pipe, gss_msg->uid, gss_msg->auth);
352 if (old == NULL) {
353 refcount_inc(&gss_msg->count);
354 list_add(&gss_msg->list, &pipe->in_downcall);
355 } else
356 gss_msg = old;
357 spin_unlock(&pipe->lock);
358 return gss_msg;
359 }
360
361 static void
362 __gss_unhash_msg(struct gss_upcall_msg *gss_msg)
363 {
364 list_del_init(&gss_msg->list);
365 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
366 wake_up_all(&gss_msg->waitqueue);
367 refcount_dec(&gss_msg->count);
368 }
369
370 static void
371 gss_unhash_msg(struct gss_upcall_msg *gss_msg)
372 {
373 struct rpc_pipe *pipe = gss_msg->pipe;
374
375 if (list_empty(&gss_msg->list))
376 return;
377 spin_lock(&pipe->lock);
378 if (!list_empty(&gss_msg->list))
379 __gss_unhash_msg(gss_msg);
380 spin_unlock(&pipe->lock);
381 }
382
383 static void
384 gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
385 {
386 switch (gss_msg->msg.errno) {
387 case 0:
388 if (gss_msg->ctx == NULL)
389 break;
390 clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
391 gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
392 break;
393 case -EKEYEXPIRED:
394 set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
395 }
396 gss_cred->gc_upcall_timestamp = jiffies;
397 gss_cred->gc_upcall = NULL;
398 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
399 }
400
401 static void
402 gss_upcall_callback(struct rpc_task *task)
403 {
404 struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred,
405 struct gss_cred, gc_base);
406 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
407 struct rpc_pipe *pipe = gss_msg->pipe;
408
409 spin_lock(&pipe->lock);
410 gss_handle_downcall_result(gss_cred, gss_msg);
411 spin_unlock(&pipe->lock);
412 task->tk_status = gss_msg->msg.errno;
413 gss_release_msg(gss_msg);
414 }
415
416 static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg,
417 const struct cred *cred)
418 {
419 struct user_namespace *userns = cred->user_ns;
420
421 uid_t uid = from_kuid_munged(userns, gss_msg->uid);
422 memcpy(gss_msg->databuf, &uid, sizeof(uid));
423 gss_msg->msg.data = gss_msg->databuf;
424 gss_msg->msg.len = sizeof(uid);
425
426 BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf));
427 }
428
429 static ssize_t
430 gss_v0_upcall(struct file *file, struct rpc_pipe_msg *msg,
431 char __user *buf, size_t buflen)
432 {
433 struct gss_upcall_msg *gss_msg = container_of(msg,
434 struct gss_upcall_msg,
435 msg);
436 if (msg->copied == 0)
437 gss_encode_v0_msg(gss_msg, file->f_cred);
438 return rpc_pipe_generic_upcall(file, msg, buf, buflen);
439 }
440
441 static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
442 const char *service_name,
443 const char *target_name,
444 const struct cred *cred)
445 {
446 struct user_namespace *userns = cred->user_ns;
447 struct gss_api_mech *mech = gss_msg->auth->mech;
448 char *p = gss_msg->databuf;
449 size_t buflen = sizeof(gss_msg->databuf);
450 int len;
451
452 len = scnprintf(p, buflen, "mech=%s uid=%d", mech->gm_name,
453 from_kuid_munged(userns, gss_msg->uid));
454 buflen -= len;
455 p += len;
456 gss_msg->msg.len = len;
457
458
459
460
461
462 if (target_name) {
463 len = scnprintf(p, buflen, " target=%s", target_name);
464 buflen -= len;
465 p += len;
466 gss_msg->msg.len += len;
467 }
468
469
470
471
472
473
474
475
476
477
478
479 if (service_name) {
480 char *c = strchr(service_name, '@');
481
482 if (!c)
483 len = scnprintf(p, buflen, " service=%s",
484 service_name);
485 else
486 len = scnprintf(p, buflen,
487 " service=%.*s srchost=%s",
488 (int)(c - service_name),
489 service_name, c + 1);
490 buflen -= len;
491 p += len;
492 gss_msg->msg.len += len;
493 }
494
495 if (mech->gm_upcall_enctypes) {
496 len = scnprintf(p, buflen, " enctypes=%s",
497 mech->gm_upcall_enctypes);
498 buflen -= len;
499 p += len;
500 gss_msg->msg.len += len;
501 }
502 trace_rpcgss_upcall_msg(gss_msg->databuf);
503 len = scnprintf(p, buflen, "\n");
504 if (len == 0)
505 goto out_overflow;
506 gss_msg->msg.len += len;
507 gss_msg->msg.data = gss_msg->databuf;
508 return 0;
509 out_overflow:
510 WARN_ON_ONCE(1);
511 return -ENOMEM;
512 }
513
514 static ssize_t
515 gss_v1_upcall(struct file *file, struct rpc_pipe_msg *msg,
516 char __user *buf, size_t buflen)
517 {
518 struct gss_upcall_msg *gss_msg = container_of(msg,
519 struct gss_upcall_msg,
520 msg);
521 int err;
522 if (msg->copied == 0) {
523 err = gss_encode_v1_msg(gss_msg,
524 gss_msg->service_name,
525 gss_msg->auth->target_name,
526 file->f_cred);
527 if (err)
528 return err;
529 }
530 return rpc_pipe_generic_upcall(file, msg, buf, buflen);
531 }
532
533 static struct gss_upcall_msg *
534 gss_alloc_msg(struct gss_auth *gss_auth,
535 kuid_t uid, const char *service_name)
536 {
537 struct gss_upcall_msg *gss_msg;
538 int vers;
539 int err = -ENOMEM;
540
541 gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
542 if (gss_msg == NULL)
543 goto err;
544 vers = get_pipe_version(gss_auth->net);
545 err = vers;
546 if (err < 0)
547 goto err_free_msg;
548 gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe;
549 INIT_LIST_HEAD(&gss_msg->list);
550 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
551 init_waitqueue_head(&gss_msg->waitqueue);
552 refcount_set(&gss_msg->count, 1);
553 gss_msg->uid = uid;
554 gss_msg->auth = gss_auth;
555 kref_get(&gss_auth->kref);
556 if (service_name) {
557 gss_msg->service_name = kstrdup_const(service_name, GFP_NOFS);
558 if (!gss_msg->service_name) {
559 err = -ENOMEM;
560 goto err_put_pipe_version;
561 }
562 }
563 return gss_msg;
564 err_put_pipe_version:
565 put_pipe_version(gss_auth->net);
566 err_free_msg:
567 kfree(gss_msg);
568 err:
569 return ERR_PTR(err);
570 }
571
572 static struct gss_upcall_msg *
573 gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred)
574 {
575 struct gss_cred *gss_cred = container_of(cred,
576 struct gss_cred, gc_base);
577 struct gss_upcall_msg *gss_new, *gss_msg;
578 kuid_t uid = cred->cr_cred->fsuid;
579
580 gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal);
581 if (IS_ERR(gss_new))
582 return gss_new;
583 gss_msg = gss_add_msg(gss_new);
584 if (gss_msg == gss_new) {
585 int res;
586 refcount_inc(&gss_msg->count);
587 res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
588 if (res) {
589 gss_unhash_msg(gss_new);
590 refcount_dec(&gss_msg->count);
591 gss_release_msg(gss_new);
592 gss_msg = ERR_PTR(res);
593 }
594 } else
595 gss_release_msg(gss_new);
596 return gss_msg;
597 }
598
599 static void warn_gssd(void)
600 {
601 dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n");
602 }
603
604 static inline int
605 gss_refresh_upcall(struct rpc_task *task)
606 {
607 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
608 struct gss_auth *gss_auth = container_of(cred->cr_auth,
609 struct gss_auth, rpc_auth);
610 struct gss_cred *gss_cred = container_of(cred,
611 struct gss_cred, gc_base);
612 struct gss_upcall_msg *gss_msg;
613 struct rpc_pipe *pipe;
614 int err = 0;
615
616 gss_msg = gss_setup_upcall(gss_auth, cred);
617 if (PTR_ERR(gss_msg) == -EAGAIN) {
618
619
620 warn_gssd();
621 rpc_sleep_on_timeout(&pipe_version_rpc_waitqueue,
622 task, NULL, jiffies + (15 * HZ));
623 err = -EAGAIN;
624 goto out;
625 }
626 if (IS_ERR(gss_msg)) {
627 err = PTR_ERR(gss_msg);
628 goto out;
629 }
630 pipe = gss_msg->pipe;
631 spin_lock(&pipe->lock);
632 if (gss_cred->gc_upcall != NULL)
633 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
634 else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
635 gss_cred->gc_upcall = gss_msg;
636
637 refcount_inc(&gss_msg->count);
638 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
639 } else {
640 gss_handle_downcall_result(gss_cred, gss_msg);
641 err = gss_msg->msg.errno;
642 }
643 spin_unlock(&pipe->lock);
644 gss_release_msg(gss_msg);
645 out:
646 trace_rpcgss_upcall_result(from_kuid(&init_user_ns,
647 cred->cr_cred->fsuid), err);
648 return err;
649 }
650
651 static inline int
652 gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
653 {
654 struct net *net = gss_auth->net;
655 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
656 struct rpc_pipe *pipe;
657 struct rpc_cred *cred = &gss_cred->gc_base;
658 struct gss_upcall_msg *gss_msg;
659 DEFINE_WAIT(wait);
660 int err;
661
662 retry:
663 err = 0;
664
665 if (!gssd_running(net)) {
666 warn_gssd();
667 err = -EACCES;
668 goto out;
669 }
670 gss_msg = gss_setup_upcall(gss_auth, cred);
671 if (PTR_ERR(gss_msg) == -EAGAIN) {
672 err = wait_event_interruptible_timeout(pipe_version_waitqueue,
673 sn->pipe_version >= 0, 15 * HZ);
674 if (sn->pipe_version < 0) {
675 warn_gssd();
676 err = -EACCES;
677 }
678 if (err < 0)
679 goto out;
680 goto retry;
681 }
682 if (IS_ERR(gss_msg)) {
683 err = PTR_ERR(gss_msg);
684 goto out;
685 }
686 pipe = gss_msg->pipe;
687 for (;;) {
688 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
689 spin_lock(&pipe->lock);
690 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
691 break;
692 }
693 spin_unlock(&pipe->lock);
694 if (fatal_signal_pending(current)) {
695 err = -ERESTARTSYS;
696 goto out_intr;
697 }
698 schedule();
699 }
700 if (gss_msg->ctx)
701 gss_cred_set_ctx(cred, gss_msg->ctx);
702 else
703 err = gss_msg->msg.errno;
704 spin_unlock(&pipe->lock);
705 out_intr:
706 finish_wait(&gss_msg->waitqueue, &wait);
707 gss_release_msg(gss_msg);
708 out:
709 trace_rpcgss_upcall_result(from_kuid(&init_user_ns,
710 cred->cr_cred->fsuid), err);
711 return err;
712 }
713
714 #define MSG_BUF_MAXSIZE 1024
715
716 static ssize_t
717 gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
718 {
719 const void *p, *end;
720 void *buf;
721 struct gss_upcall_msg *gss_msg;
722 struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe;
723 struct gss_cl_ctx *ctx;
724 uid_t id;
725 kuid_t uid;
726 ssize_t err = -EFBIG;
727
728 if (mlen > MSG_BUF_MAXSIZE)
729 goto out;
730 err = -ENOMEM;
731 buf = kmalloc(mlen, GFP_NOFS);
732 if (!buf)
733 goto out;
734
735 err = -EFAULT;
736 if (copy_from_user(buf, src, mlen))
737 goto err;
738
739 end = (const void *)((char *)buf + mlen);
740 p = simple_get_bytes(buf, end, &id, sizeof(id));
741 if (IS_ERR(p)) {
742 err = PTR_ERR(p);
743 goto err;
744 }
745
746 uid = make_kuid(current_user_ns(), id);
747 if (!uid_valid(uid)) {
748 err = -EINVAL;
749 goto err;
750 }
751
752 err = -ENOMEM;
753 ctx = gss_alloc_context();
754 if (ctx == NULL)
755 goto err;
756
757 err = -ENOENT;
758
759 spin_lock(&pipe->lock);
760 gss_msg = __gss_find_upcall(pipe, uid, NULL);
761 if (gss_msg == NULL) {
762 spin_unlock(&pipe->lock);
763 goto err_put_ctx;
764 }
765 list_del_init(&gss_msg->list);
766 spin_unlock(&pipe->lock);
767
768 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
769 if (IS_ERR(p)) {
770 err = PTR_ERR(p);
771 switch (err) {
772 case -EACCES:
773 case -EKEYEXPIRED:
774 gss_msg->msg.errno = err;
775 err = mlen;
776 break;
777 case -EFAULT:
778 case -ENOMEM:
779 case -EINVAL:
780 case -ENOSYS:
781 gss_msg->msg.errno = -EAGAIN;
782 break;
783 default:
784 printk(KERN_CRIT "%s: bad return from "
785 "gss_fill_context: %zd\n", __func__, err);
786 gss_msg->msg.errno = -EIO;
787 }
788 goto err_release_msg;
789 }
790 gss_msg->ctx = gss_get_ctx(ctx);
791 err = mlen;
792
793 err_release_msg:
794 spin_lock(&pipe->lock);
795 __gss_unhash_msg(gss_msg);
796 spin_unlock(&pipe->lock);
797 gss_release_msg(gss_msg);
798 err_put_ctx:
799 gss_put_ctx(ctx);
800 err:
801 kfree(buf);
802 out:
803 return err;
804 }
805
806 static int gss_pipe_open(struct inode *inode, int new_version)
807 {
808 struct net *net = inode->i_sb->s_fs_info;
809 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
810 int ret = 0;
811
812 spin_lock(&pipe_version_lock);
813 if (sn->pipe_version < 0) {
814
815 sn->pipe_version = new_version;
816 rpc_wake_up(&pipe_version_rpc_waitqueue);
817 wake_up(&pipe_version_waitqueue);
818 } else if (sn->pipe_version != new_version) {
819
820 ret = -EBUSY;
821 goto out;
822 }
823 atomic_inc(&sn->pipe_users);
824 out:
825 spin_unlock(&pipe_version_lock);
826 return ret;
827
828 }
829
830 static int gss_pipe_open_v0(struct inode *inode)
831 {
832 return gss_pipe_open(inode, 0);
833 }
834
835 static int gss_pipe_open_v1(struct inode *inode)
836 {
837 return gss_pipe_open(inode, 1);
838 }
839
840 static void
841 gss_pipe_release(struct inode *inode)
842 {
843 struct net *net = inode->i_sb->s_fs_info;
844 struct rpc_pipe *pipe = RPC_I(inode)->pipe;
845 struct gss_upcall_msg *gss_msg;
846
847 restart:
848 spin_lock(&pipe->lock);
849 list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
850
851 if (!list_empty(&gss_msg->msg.list))
852 continue;
853 gss_msg->msg.errno = -EPIPE;
854 refcount_inc(&gss_msg->count);
855 __gss_unhash_msg(gss_msg);
856 spin_unlock(&pipe->lock);
857 gss_release_msg(gss_msg);
858 goto restart;
859 }
860 spin_unlock(&pipe->lock);
861
862 put_pipe_version(net);
863 }
864
865 static void
866 gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
867 {
868 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
869
870 if (msg->errno < 0) {
871 refcount_inc(&gss_msg->count);
872 gss_unhash_msg(gss_msg);
873 if (msg->errno == -ETIMEDOUT)
874 warn_gssd();
875 gss_release_msg(gss_msg);
876 }
877 gss_release_msg(gss_msg);
878 }
879
880 static void gss_pipe_dentry_destroy(struct dentry *dir,
881 struct rpc_pipe_dir_object *pdo)
882 {
883 struct gss_pipe *gss_pipe = pdo->pdo_data;
884 struct rpc_pipe *pipe = gss_pipe->pipe;
885
886 if (pipe->dentry != NULL) {
887 rpc_unlink(pipe->dentry);
888 pipe->dentry = NULL;
889 }
890 }
891
892 static int gss_pipe_dentry_create(struct dentry *dir,
893 struct rpc_pipe_dir_object *pdo)
894 {
895 struct gss_pipe *p = pdo->pdo_data;
896 struct dentry *dentry;
897
898 dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe);
899 if (IS_ERR(dentry))
900 return PTR_ERR(dentry);
901 p->pipe->dentry = dentry;
902 return 0;
903 }
904
905 static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = {
906 .create = gss_pipe_dentry_create,
907 .destroy = gss_pipe_dentry_destroy,
908 };
909
910 static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt,
911 const char *name,
912 const struct rpc_pipe_ops *upcall_ops)
913 {
914 struct gss_pipe *p;
915 int err = -ENOMEM;
916
917 p = kmalloc(sizeof(*p), GFP_KERNEL);
918 if (p == NULL)
919 goto err;
920 p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
921 if (IS_ERR(p->pipe)) {
922 err = PTR_ERR(p->pipe);
923 goto err_free_gss_pipe;
924 }
925 p->name = name;
926 p->clnt = clnt;
927 kref_init(&p->kref);
928 rpc_init_pipe_dir_object(&p->pdo,
929 &gss_pipe_dir_object_ops,
930 p);
931 return p;
932 err_free_gss_pipe:
933 kfree(p);
934 err:
935 return ERR_PTR(err);
936 }
937
938 struct gss_alloc_pdo {
939 struct rpc_clnt *clnt;
940 const char *name;
941 const struct rpc_pipe_ops *upcall_ops;
942 };
943
944 static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data)
945 {
946 struct gss_pipe *gss_pipe;
947 struct gss_alloc_pdo *args = data;
948
949 if (pdo->pdo_ops != &gss_pipe_dir_object_ops)
950 return 0;
951 gss_pipe = container_of(pdo, struct gss_pipe, pdo);
952 if (strcmp(gss_pipe->name, args->name) != 0)
953 return 0;
954 if (!kref_get_unless_zero(&gss_pipe->kref))
955 return 0;
956 return 1;
957 }
958
959 static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data)
960 {
961 struct gss_pipe *gss_pipe;
962 struct gss_alloc_pdo *args = data;
963
964 gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops);
965 if (!IS_ERR(gss_pipe))
966 return &gss_pipe->pdo;
967 return NULL;
968 }
969
970 static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt,
971 const char *name,
972 const struct rpc_pipe_ops *upcall_ops)
973 {
974 struct net *net = rpc_net_ns(clnt);
975 struct rpc_pipe_dir_object *pdo;
976 struct gss_alloc_pdo args = {
977 .clnt = clnt,
978 .name = name,
979 .upcall_ops = upcall_ops,
980 };
981
982 pdo = rpc_find_or_alloc_pipe_dir_object(net,
983 &clnt->cl_pipedir_objects,
984 gss_pipe_match_pdo,
985 gss_pipe_alloc_pdo,
986 &args);
987 if (pdo != NULL)
988 return container_of(pdo, struct gss_pipe, pdo);
989 return ERR_PTR(-ENOMEM);
990 }
991
992 static void __gss_pipe_free(struct gss_pipe *p)
993 {
994 struct rpc_clnt *clnt = p->clnt;
995 struct net *net = rpc_net_ns(clnt);
996
997 rpc_remove_pipe_dir_object(net,
998 &clnt->cl_pipedir_objects,
999 &p->pdo);
1000 rpc_destroy_pipe_data(p->pipe);
1001 kfree(p);
1002 }
1003
1004 static void __gss_pipe_release(struct kref *kref)
1005 {
1006 struct gss_pipe *p = container_of(kref, struct gss_pipe, kref);
1007
1008 __gss_pipe_free(p);
1009 }
1010
1011 static void gss_pipe_free(struct gss_pipe *p)
1012 {
1013 if (p != NULL)
1014 kref_put(&p->kref, __gss_pipe_release);
1015 }
1016
1017
1018
1019
1020
1021 static struct gss_auth *
1022 gss_create_new(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
1023 {
1024 rpc_authflavor_t flavor = args->pseudoflavor;
1025 struct gss_auth *gss_auth;
1026 struct gss_pipe *gss_pipe;
1027 struct rpc_auth * auth;
1028 int err = -ENOMEM;
1029
1030 if (!try_module_get(THIS_MODULE))
1031 return ERR_PTR(err);
1032 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
1033 goto out_dec;
1034 INIT_HLIST_NODE(&gss_auth->hash);
1035 gss_auth->target_name = NULL;
1036 if (args->target_name) {
1037 gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL);
1038 if (gss_auth->target_name == NULL)
1039 goto err_free;
1040 }
1041 gss_auth->client = clnt;
1042 gss_auth->net = get_net(rpc_net_ns(clnt));
1043 err = -EINVAL;
1044 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
1045 if (!gss_auth->mech)
1046 goto err_put_net;
1047 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
1048 if (gss_auth->service == 0)
1049 goto err_put_mech;
1050 if (!gssd_running(gss_auth->net))
1051 goto err_put_mech;
1052 auth = &gss_auth->rpc_auth;
1053 auth->au_cslack = GSS_CRED_SLACK >> 2;
1054 auth->au_rslack = GSS_KRB5_MAX_SLACK_NEEDED >> 2;
1055 auth->au_verfsize = GSS_VERF_SLACK >> 2;
1056 auth->au_ralign = GSS_VERF_SLACK >> 2;
1057 auth->au_flags = 0;
1058 auth->au_ops = &authgss_ops;
1059 auth->au_flavor = flavor;
1060 if (gss_pseudoflavor_to_datatouch(gss_auth->mech, flavor))
1061 auth->au_flags |= RPCAUTH_AUTH_DATATOUCH;
1062 refcount_set(&auth->au_count, 1);
1063 kref_init(&gss_auth->kref);
1064
1065 err = rpcauth_init_credcache(auth);
1066 if (err)
1067 goto err_put_mech;
1068
1069
1070
1071
1072
1073
1074 gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1);
1075 if (IS_ERR(gss_pipe)) {
1076 err = PTR_ERR(gss_pipe);
1077 goto err_destroy_credcache;
1078 }
1079 gss_auth->gss_pipe[1] = gss_pipe;
1080
1081 gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name,
1082 &gss_upcall_ops_v0);
1083 if (IS_ERR(gss_pipe)) {
1084 err = PTR_ERR(gss_pipe);
1085 goto err_destroy_pipe_1;
1086 }
1087 gss_auth->gss_pipe[0] = gss_pipe;
1088
1089 return gss_auth;
1090 err_destroy_pipe_1:
1091 gss_pipe_free(gss_auth->gss_pipe[1]);
1092 err_destroy_credcache:
1093 rpcauth_destroy_credcache(auth);
1094 err_put_mech:
1095 gss_mech_put(gss_auth->mech);
1096 err_put_net:
1097 put_net(gss_auth->net);
1098 err_free:
1099 kfree(gss_auth->target_name);
1100 kfree(gss_auth);
1101 out_dec:
1102 module_put(THIS_MODULE);
1103 trace_rpcgss_createauth(flavor, err);
1104 return ERR_PTR(err);
1105 }
1106
1107 static void
1108 gss_free(struct gss_auth *gss_auth)
1109 {
1110 gss_pipe_free(gss_auth->gss_pipe[0]);
1111 gss_pipe_free(gss_auth->gss_pipe[1]);
1112 gss_mech_put(gss_auth->mech);
1113 put_net(gss_auth->net);
1114 kfree(gss_auth->target_name);
1115
1116 kfree(gss_auth);
1117 module_put(THIS_MODULE);
1118 }
1119
1120 static void
1121 gss_free_callback(struct kref *kref)
1122 {
1123 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
1124
1125 gss_free(gss_auth);
1126 }
1127
1128 static void
1129 gss_put_auth(struct gss_auth *gss_auth)
1130 {
1131 kref_put(&gss_auth->kref, gss_free_callback);
1132 }
1133
1134 static void
1135 gss_destroy(struct rpc_auth *auth)
1136 {
1137 struct gss_auth *gss_auth = container_of(auth,
1138 struct gss_auth, rpc_auth);
1139
1140 if (hash_hashed(&gss_auth->hash)) {
1141 spin_lock(&gss_auth_hash_lock);
1142 hash_del(&gss_auth->hash);
1143 spin_unlock(&gss_auth_hash_lock);
1144 }
1145
1146 gss_pipe_free(gss_auth->gss_pipe[0]);
1147 gss_auth->gss_pipe[0] = NULL;
1148 gss_pipe_free(gss_auth->gss_pipe[1]);
1149 gss_auth->gss_pipe[1] = NULL;
1150 rpcauth_destroy_credcache(auth);
1151
1152 gss_put_auth(gss_auth);
1153 }
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164 static struct gss_auth *
1165 gss_auth_find_or_add_hashed(const struct rpc_auth_create_args *args,
1166 struct rpc_clnt *clnt,
1167 struct gss_auth *new)
1168 {
1169 struct gss_auth *gss_auth;
1170 unsigned long hashval = (unsigned long)clnt;
1171
1172 spin_lock(&gss_auth_hash_lock);
1173 hash_for_each_possible(gss_auth_hash_table,
1174 gss_auth,
1175 hash,
1176 hashval) {
1177 if (gss_auth->client != clnt)
1178 continue;
1179 if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor)
1180 continue;
1181 if (gss_auth->target_name != args->target_name) {
1182 if (gss_auth->target_name == NULL)
1183 continue;
1184 if (args->target_name == NULL)
1185 continue;
1186 if (strcmp(gss_auth->target_name, args->target_name))
1187 continue;
1188 }
1189 if (!refcount_inc_not_zero(&gss_auth->rpc_auth.au_count))
1190 continue;
1191 goto out;
1192 }
1193 if (new)
1194 hash_add(gss_auth_hash_table, &new->hash, hashval);
1195 gss_auth = new;
1196 out:
1197 spin_unlock(&gss_auth_hash_lock);
1198 return gss_auth;
1199 }
1200
1201 static struct gss_auth *
1202 gss_create_hashed(const struct rpc_auth_create_args *args,
1203 struct rpc_clnt *clnt)
1204 {
1205 struct gss_auth *gss_auth;
1206 struct gss_auth *new;
1207
1208 gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL);
1209 if (gss_auth != NULL)
1210 goto out;
1211 new = gss_create_new(args, clnt);
1212 if (IS_ERR(new))
1213 return new;
1214 gss_auth = gss_auth_find_or_add_hashed(args, clnt, new);
1215 if (gss_auth != new)
1216 gss_destroy(&new->rpc_auth);
1217 out:
1218 return gss_auth;
1219 }
1220
1221 static struct rpc_auth *
1222 gss_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
1223 {
1224 struct gss_auth *gss_auth;
1225 struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
1226
1227 while (clnt != clnt->cl_parent) {
1228 struct rpc_clnt *parent = clnt->cl_parent;
1229
1230 if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
1231 break;
1232 clnt = parent;
1233 }
1234
1235 gss_auth = gss_create_hashed(args, clnt);
1236 if (IS_ERR(gss_auth))
1237 return ERR_CAST(gss_auth);
1238 return &gss_auth->rpc_auth;
1239 }
1240
1241 static struct gss_cred *
1242 gss_dup_cred(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
1243 {
1244 struct gss_cred *new;
1245
1246
1247 new = kzalloc(sizeof(*gss_cred), GFP_NOFS);
1248 if (new) {
1249 struct auth_cred acred = {
1250 .cred = gss_cred->gc_base.cr_cred,
1251 };
1252 struct gss_cl_ctx *ctx =
1253 rcu_dereference_protected(gss_cred->gc_ctx, 1);
1254
1255 rpcauth_init_cred(&new->gc_base, &acred,
1256 &gss_auth->rpc_auth,
1257 &gss_nullops);
1258 new->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
1259 new->gc_service = gss_cred->gc_service;
1260 new->gc_principal = gss_cred->gc_principal;
1261 kref_get(&gss_auth->kref);
1262 rcu_assign_pointer(new->gc_ctx, ctx);
1263 gss_get_ctx(ctx);
1264 }
1265 return new;
1266 }
1267
1268
1269
1270
1271
1272
1273
1274 static void
1275 gss_send_destroy_context(struct rpc_cred *cred)
1276 {
1277 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1278 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1279 struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
1280 struct gss_cred *new;
1281 struct rpc_task *task;
1282
1283 new = gss_dup_cred(gss_auth, gss_cred);
1284 if (new) {
1285 ctx->gc_proc = RPC_GSS_PROC_DESTROY;
1286
1287 task = rpc_call_null(gss_auth->client, &new->gc_base,
1288 RPC_TASK_ASYNC|RPC_TASK_SOFT);
1289 if (!IS_ERR(task))
1290 rpc_put_task(task);
1291
1292 put_rpccred(&new->gc_base);
1293 }
1294 }
1295
1296
1297
1298
1299 static void
1300 gss_do_free_ctx(struct gss_cl_ctx *ctx)
1301 {
1302 gss_delete_sec_context(&ctx->gc_gss_ctx);
1303 kfree(ctx->gc_wire_ctx.data);
1304 kfree(ctx->gc_acceptor.data);
1305 kfree(ctx);
1306 }
1307
1308 static void
1309 gss_free_ctx_callback(struct rcu_head *head)
1310 {
1311 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
1312 gss_do_free_ctx(ctx);
1313 }
1314
1315 static void
1316 gss_free_ctx(struct gss_cl_ctx *ctx)
1317 {
1318 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
1319 }
1320
1321 static void
1322 gss_free_cred(struct gss_cred *gss_cred)
1323 {
1324 kfree(gss_cred);
1325 }
1326
1327 static void
1328 gss_free_cred_callback(struct rcu_head *head)
1329 {
1330 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
1331 gss_free_cred(gss_cred);
1332 }
1333
1334 static void
1335 gss_destroy_nullcred(struct rpc_cred *cred)
1336 {
1337 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1338 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1339 struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
1340
1341 RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
1342 put_cred(cred->cr_cred);
1343 call_rcu(&cred->cr_rcu, gss_free_cred_callback);
1344 if (ctx)
1345 gss_put_ctx(ctx);
1346 gss_put_auth(gss_auth);
1347 }
1348
1349 static void
1350 gss_destroy_cred(struct rpc_cred *cred)
1351 {
1352
1353 if (test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0)
1354 gss_send_destroy_context(cred);
1355 gss_destroy_nullcred(cred);
1356 }
1357
1358 static int
1359 gss_hash_cred(struct auth_cred *acred, unsigned int hashbits)
1360 {
1361 return hash_64(from_kuid(&init_user_ns, acred->cred->fsuid), hashbits);
1362 }
1363
1364
1365
1366
1367 static struct rpc_cred *
1368 gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1369 {
1370 return rpcauth_lookup_credcache(auth, acred, flags, GFP_NOFS);
1371 }
1372
1373 static struct rpc_cred *
1374 gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp)
1375 {
1376 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1377 struct gss_cred *cred = NULL;
1378 int err = -ENOMEM;
1379
1380 if (!(cred = kzalloc(sizeof(*cred), gfp)))
1381 goto out_err;
1382
1383 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
1384
1385
1386
1387
1388 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
1389 cred->gc_service = gss_auth->service;
1390 cred->gc_principal = acred->principal;
1391 kref_get(&gss_auth->kref);
1392 return &cred->gc_base;
1393
1394 out_err:
1395 return ERR_PTR(err);
1396 }
1397
1398 static int
1399 gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
1400 {
1401 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1402 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
1403 int err;
1404
1405 do {
1406 err = gss_create_upcall(gss_auth, gss_cred);
1407 } while (err == -EAGAIN);
1408 return err;
1409 }
1410
1411 static char *
1412 gss_stringify_acceptor(struct rpc_cred *cred)
1413 {
1414 char *string = NULL;
1415 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1416 struct gss_cl_ctx *ctx;
1417 unsigned int len;
1418 struct xdr_netobj *acceptor;
1419
1420 rcu_read_lock();
1421 ctx = rcu_dereference(gss_cred->gc_ctx);
1422 if (!ctx)
1423 goto out;
1424
1425 len = ctx->gc_acceptor.len;
1426 rcu_read_unlock();
1427
1428
1429 if (!len)
1430 return NULL;
1431 realloc:
1432 string = kmalloc(len + 1, GFP_KERNEL);
1433 if (!string)
1434 return NULL;
1435
1436 rcu_read_lock();
1437 ctx = rcu_dereference(gss_cred->gc_ctx);
1438
1439
1440 if (!ctx || !ctx->gc_acceptor.len) {
1441 kfree(string);
1442 string = NULL;
1443 goto out;
1444 }
1445
1446 acceptor = &ctx->gc_acceptor;
1447
1448
1449
1450
1451
1452 if (len < acceptor->len) {
1453 len = acceptor->len;
1454 rcu_read_unlock();
1455 kfree(string);
1456 goto realloc;
1457 }
1458
1459 memcpy(string, acceptor->data, acceptor->len);
1460 string[acceptor->len] = '\0';
1461 out:
1462 rcu_read_unlock();
1463 return string;
1464 }
1465
1466
1467
1468
1469
1470 static int
1471 gss_key_timeout(struct rpc_cred *rc)
1472 {
1473 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1474 struct gss_cl_ctx *ctx;
1475 unsigned long timeout = jiffies + (gss_key_expire_timeo * HZ);
1476 int ret = 0;
1477
1478 rcu_read_lock();
1479 ctx = rcu_dereference(gss_cred->gc_ctx);
1480 if (!ctx || time_after(timeout, ctx->gc_expiry))
1481 ret = -EACCES;
1482 rcu_read_unlock();
1483
1484 return ret;
1485 }
1486
1487 static int
1488 gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
1489 {
1490 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1491 struct gss_cl_ctx *ctx;
1492 int ret;
1493
1494 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1495 goto out;
1496
1497 rcu_read_lock();
1498 ctx = rcu_dereference(gss_cred->gc_ctx);
1499 if (!ctx || time_after(jiffies, ctx->gc_expiry)) {
1500 rcu_read_unlock();
1501 return 0;
1502 }
1503 rcu_read_unlock();
1504 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
1505 return 0;
1506 out:
1507 if (acred->principal != NULL) {
1508 if (gss_cred->gc_principal == NULL)
1509 return 0;
1510 ret = strcmp(acred->principal, gss_cred->gc_principal) == 0;
1511 } else {
1512 if (gss_cred->gc_principal != NULL)
1513 return 0;
1514 ret = uid_eq(rc->cr_cred->fsuid, acred->cred->fsuid);
1515 }
1516 return ret;
1517 }
1518
1519
1520
1521
1522
1523
1524
1525
1526 static int gss_marshal(struct rpc_task *task, struct xdr_stream *xdr)
1527 {
1528 struct rpc_rqst *req = task->tk_rqstp;
1529 struct rpc_cred *cred = req->rq_cred;
1530 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1531 gc_base);
1532 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1533 __be32 *p, *cred_len;
1534 u32 maj_stat = 0;
1535 struct xdr_netobj mic;
1536 struct kvec iov;
1537 struct xdr_buf verf_buf;
1538 int status;
1539
1540
1541
1542 p = xdr_reserve_space(xdr, 7 * sizeof(*p) +
1543 ctx->gc_wire_ctx.len);
1544 if (!p)
1545 goto marshal_failed;
1546 *p++ = rpc_auth_gss;
1547 cred_len = p++;
1548
1549 spin_lock(&ctx->gc_seq_lock);
1550 req->rq_seqno = (ctx->gc_seq < MAXSEQ) ? ctx->gc_seq++ : MAXSEQ;
1551 spin_unlock(&ctx->gc_seq_lock);
1552 if (req->rq_seqno == MAXSEQ)
1553 goto expired;
1554 trace_rpcgss_seqno(task);
1555
1556 *p++ = cpu_to_be32(RPC_GSS_VERSION);
1557 *p++ = cpu_to_be32(ctx->gc_proc);
1558 *p++ = cpu_to_be32(req->rq_seqno);
1559 *p++ = cpu_to_be32(gss_cred->gc_service);
1560 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
1561 *cred_len = cpu_to_be32((p - (cred_len + 1)) << 2);
1562
1563
1564
1565
1566
1567 iov.iov_base = req->rq_snd_buf.head[0].iov_base;
1568 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
1569 xdr_buf_from_iov(&iov, &verf_buf);
1570
1571 p = xdr_reserve_space(xdr, sizeof(*p));
1572 if (!p)
1573 goto marshal_failed;
1574 *p++ = rpc_auth_gss;
1575 mic.data = (u8 *)(p + 1);
1576 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1577 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1578 goto expired;
1579 else if (maj_stat != 0)
1580 goto bad_mic;
1581 if (xdr_stream_encode_opaque_inline(xdr, (void **)&p, mic.len) < 0)
1582 goto marshal_failed;
1583 status = 0;
1584 out:
1585 gss_put_ctx(ctx);
1586 return status;
1587 expired:
1588 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1589 status = -EKEYEXPIRED;
1590 goto out;
1591 marshal_failed:
1592 status = -EMSGSIZE;
1593 goto out;
1594 bad_mic:
1595 trace_rpcgss_get_mic(task, maj_stat);
1596 status = -EIO;
1597 goto out;
1598 }
1599
1600 static int gss_renew_cred(struct rpc_task *task)
1601 {
1602 struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1603 struct gss_cred *gss_cred = container_of(oldcred,
1604 struct gss_cred,
1605 gc_base);
1606 struct rpc_auth *auth = oldcred->cr_auth;
1607 struct auth_cred acred = {
1608 .cred = oldcred->cr_cred,
1609 .principal = gss_cred->gc_principal,
1610 };
1611 struct rpc_cred *new;
1612
1613 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
1614 if (IS_ERR(new))
1615 return PTR_ERR(new);
1616 task->tk_rqstp->rq_cred = new;
1617 put_rpccred(oldcred);
1618 return 0;
1619 }
1620
1621 static int gss_cred_is_negative_entry(struct rpc_cred *cred)
1622 {
1623 if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) {
1624 unsigned long now = jiffies;
1625 unsigned long begin, expire;
1626 struct gss_cred *gss_cred;
1627
1628 gss_cred = container_of(cred, struct gss_cred, gc_base);
1629 begin = gss_cred->gc_upcall_timestamp;
1630 expire = begin + gss_expired_cred_retry_delay * HZ;
1631
1632 if (time_in_range_open(now, begin, expire))
1633 return 1;
1634 }
1635 return 0;
1636 }
1637
1638
1639
1640
1641 static int
1642 gss_refresh(struct rpc_task *task)
1643 {
1644 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1645 int ret = 0;
1646
1647 if (gss_cred_is_negative_entry(cred))
1648 return -EKEYEXPIRED;
1649
1650 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
1651 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
1652 ret = gss_renew_cred(task);
1653 if (ret < 0)
1654 goto out;
1655 cred = task->tk_rqstp->rq_cred;
1656 }
1657
1658 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
1659 ret = gss_refresh_upcall(task);
1660 out:
1661 return ret;
1662 }
1663
1664
1665 static int
1666 gss_refresh_null(struct rpc_task *task)
1667 {
1668 return 0;
1669 }
1670
1671 static int
1672 gss_validate(struct rpc_task *task, struct xdr_stream *xdr)
1673 {
1674 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1675 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1676 __be32 *p, *seq = NULL;
1677 struct kvec iov;
1678 struct xdr_buf verf_buf;
1679 struct xdr_netobj mic;
1680 u32 len, maj_stat;
1681 int status;
1682
1683 p = xdr_inline_decode(xdr, 2 * sizeof(*p));
1684 if (!p)
1685 goto validate_failed;
1686 if (*p++ != rpc_auth_gss)
1687 goto validate_failed;
1688 len = be32_to_cpup(p);
1689 if (len > RPC_MAX_AUTH_SIZE)
1690 goto validate_failed;
1691 p = xdr_inline_decode(xdr, len);
1692 if (!p)
1693 goto validate_failed;
1694
1695 seq = kmalloc(4, GFP_NOFS);
1696 if (!seq)
1697 goto validate_failed;
1698 *seq = cpu_to_be32(task->tk_rqstp->rq_seqno);
1699 iov.iov_base = seq;
1700 iov.iov_len = 4;
1701 xdr_buf_from_iov(&iov, &verf_buf);
1702 mic.data = (u8 *)p;
1703 mic.len = len;
1704 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1705 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1706 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1707 if (maj_stat)
1708 goto bad_mic;
1709
1710
1711
1712 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
1713 status = 0;
1714 out:
1715 gss_put_ctx(ctx);
1716 kfree(seq);
1717 return status;
1718
1719 validate_failed:
1720 status = -EIO;
1721 goto out;
1722 bad_mic:
1723 trace_rpcgss_verify_mic(task, maj_stat);
1724 status = -EACCES;
1725 goto out;
1726 }
1727
1728 static int gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1729 struct rpc_task *task, struct xdr_stream *xdr)
1730 {
1731 struct rpc_rqst *rqstp = task->tk_rqstp;
1732 struct xdr_buf integ_buf, *snd_buf = &rqstp->rq_snd_buf;
1733 struct xdr_netobj mic;
1734 __be32 *p, *integ_len;
1735 u32 offset, maj_stat;
1736
1737 p = xdr_reserve_space(xdr, 2 * sizeof(*p));
1738 if (!p)
1739 goto wrap_failed;
1740 integ_len = p++;
1741 *p = cpu_to_be32(rqstp->rq_seqno);
1742
1743 if (rpcauth_wrap_req_encode(task, xdr))
1744 goto wrap_failed;
1745
1746 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1747 if (xdr_buf_subsegment(snd_buf, &integ_buf,
1748 offset, snd_buf->len - offset))
1749 goto wrap_failed;
1750 *integ_len = cpu_to_be32(integ_buf.len);
1751
1752 p = xdr_reserve_space(xdr, 0);
1753 if (!p)
1754 goto wrap_failed;
1755 mic.data = (u8 *)(p + 1);
1756 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1757 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1758 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1759 else if (maj_stat)
1760 goto bad_mic;
1761
1762 if (xdr_stream_encode_opaque_inline(xdr, (void **)&p, mic.len) < 0)
1763 goto wrap_failed;
1764 return 0;
1765 wrap_failed:
1766 return -EMSGSIZE;
1767 bad_mic:
1768 trace_rpcgss_get_mic(task, maj_stat);
1769 return -EIO;
1770 }
1771
1772 static void
1773 priv_release_snd_buf(struct rpc_rqst *rqstp)
1774 {
1775 int i;
1776
1777 for (i=0; i < rqstp->rq_enc_pages_num; i++)
1778 __free_page(rqstp->rq_enc_pages[i]);
1779 kfree(rqstp->rq_enc_pages);
1780 rqstp->rq_release_snd_buf = NULL;
1781 }
1782
1783 static int
1784 alloc_enc_pages(struct rpc_rqst *rqstp)
1785 {
1786 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1787 int first, last, i;
1788
1789 if (rqstp->rq_release_snd_buf)
1790 rqstp->rq_release_snd_buf(rqstp);
1791
1792 if (snd_buf->page_len == 0) {
1793 rqstp->rq_enc_pages_num = 0;
1794 return 0;
1795 }
1796
1797 first = snd_buf->page_base >> PAGE_SHIFT;
1798 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_SHIFT;
1799 rqstp->rq_enc_pages_num = last - first + 1 + 1;
1800 rqstp->rq_enc_pages
1801 = kmalloc_array(rqstp->rq_enc_pages_num,
1802 sizeof(struct page *),
1803 GFP_NOFS);
1804 if (!rqstp->rq_enc_pages)
1805 goto out;
1806 for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1807 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
1808 if (rqstp->rq_enc_pages[i] == NULL)
1809 goto out_free;
1810 }
1811 rqstp->rq_release_snd_buf = priv_release_snd_buf;
1812 return 0;
1813 out_free:
1814 rqstp->rq_enc_pages_num = i;
1815 priv_release_snd_buf(rqstp);
1816 out:
1817 return -EAGAIN;
1818 }
1819
1820 static int gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1821 struct rpc_task *task, struct xdr_stream *xdr)
1822 {
1823 struct rpc_rqst *rqstp = task->tk_rqstp;
1824 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1825 u32 pad, offset, maj_stat;
1826 int status;
1827 __be32 *p, *opaque_len;
1828 struct page **inpages;
1829 int first;
1830 struct kvec *iov;
1831
1832 status = -EIO;
1833 p = xdr_reserve_space(xdr, 2 * sizeof(*p));
1834 if (!p)
1835 goto wrap_failed;
1836 opaque_len = p++;
1837 *p = cpu_to_be32(rqstp->rq_seqno);
1838
1839 if (rpcauth_wrap_req_encode(task, xdr))
1840 goto wrap_failed;
1841
1842 status = alloc_enc_pages(rqstp);
1843 if (unlikely(status))
1844 goto wrap_failed;
1845 first = snd_buf->page_base >> PAGE_SHIFT;
1846 inpages = snd_buf->pages + first;
1847 snd_buf->pages = rqstp->rq_enc_pages;
1848 snd_buf->page_base -= first << PAGE_SHIFT;
1849
1850
1851
1852
1853
1854
1855 if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1856 char *tmp;
1857
1858 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1859 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1860 snd_buf->tail[0].iov_base = tmp;
1861 }
1862 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1863 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1864
1865 if (unlikely(snd_buf->len > snd_buf->buflen))
1866 goto wrap_failed;
1867
1868
1869 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1870 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1871 else if (maj_stat)
1872 goto bad_wrap;
1873
1874 *opaque_len = cpu_to_be32(snd_buf->len - offset);
1875
1876 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1877 iov = snd_buf->tail;
1878 else
1879 iov = snd_buf->head;
1880 p = iov->iov_base + iov->iov_len;
1881 pad = 3 - ((snd_buf->len - offset - 1) & 3);
1882 memset(p, 0, pad);
1883 iov->iov_len += pad;
1884 snd_buf->len += pad;
1885
1886 return 0;
1887 wrap_failed:
1888 return status;
1889 bad_wrap:
1890 trace_rpcgss_wrap(task, maj_stat);
1891 return -EIO;
1892 }
1893
1894 static int gss_wrap_req(struct rpc_task *task, struct xdr_stream *xdr)
1895 {
1896 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1897 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1898 gc_base);
1899 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1900 int status;
1901
1902 status = -EIO;
1903 if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1904
1905
1906
1907 status = rpcauth_wrap_req_encode(task, xdr);
1908 goto out;
1909 }
1910 switch (gss_cred->gc_service) {
1911 case RPC_GSS_SVC_NONE:
1912 status = rpcauth_wrap_req_encode(task, xdr);
1913 break;
1914 case RPC_GSS_SVC_INTEGRITY:
1915 status = gss_wrap_req_integ(cred, ctx, task, xdr);
1916 break;
1917 case RPC_GSS_SVC_PRIVACY:
1918 status = gss_wrap_req_priv(cred, ctx, task, xdr);
1919 break;
1920 default:
1921 status = -EIO;
1922 }
1923 out:
1924 gss_put_ctx(ctx);
1925 return status;
1926 }
1927
1928 static int
1929 gss_unwrap_resp_auth(struct rpc_cred *cred)
1930 {
1931 struct rpc_auth *auth = cred->cr_auth;
1932
1933 auth->au_rslack = auth->au_verfsize;
1934 auth->au_ralign = auth->au_verfsize;
1935 return 0;
1936 }
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951 static int
1952 gss_unwrap_resp_integ(struct rpc_task *task, struct rpc_cred *cred,
1953 struct gss_cl_ctx *ctx, struct rpc_rqst *rqstp,
1954 struct xdr_stream *xdr)
1955 {
1956 struct xdr_buf gss_data, *rcv_buf = &rqstp->rq_rcv_buf;
1957 struct rpc_auth *auth = cred->cr_auth;
1958 u32 len, offset, seqno, maj_stat;
1959 struct xdr_netobj mic;
1960 int ret;
1961
1962 ret = -EIO;
1963 mic.data = NULL;
1964
1965
1966 if (xdr_stream_decode_u32(xdr, &len))
1967 goto unwrap_failed;
1968 if (len & 3)
1969 goto unwrap_failed;
1970 offset = rcv_buf->len - xdr_stream_remaining(xdr);
1971 if (xdr_stream_decode_u32(xdr, &seqno))
1972 goto unwrap_failed;
1973 if (seqno != rqstp->rq_seqno)
1974 goto bad_seqno;
1975 if (xdr_buf_subsegment(rcv_buf, &gss_data, offset, len))
1976 goto unwrap_failed;
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987 offset += len;
1988 if (xdr_decode_word(rcv_buf, offset, &len))
1989 goto unwrap_failed;
1990 offset += sizeof(__be32);
1991 if (offset + len > rcv_buf->len)
1992 goto unwrap_failed;
1993 mic.len = len;
1994 mic.data = kmalloc(len, GFP_NOFS);
1995 if (!mic.data)
1996 goto unwrap_failed;
1997 if (read_bytes_from_xdr_buf(rcv_buf, offset, mic.data, mic.len))
1998 goto unwrap_failed;
1999
2000 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &gss_data, &mic);
2001 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
2002 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
2003 if (maj_stat != GSS_S_COMPLETE)
2004 goto bad_mic;
2005
2006 auth->au_rslack = auth->au_verfsize + 2 + 1 + XDR_QUADLEN(mic.len);
2007 auth->au_ralign = auth->au_verfsize + 2;
2008 ret = 0;
2009
2010 out:
2011 kfree(mic.data);
2012 return ret;
2013
2014 unwrap_failed:
2015 trace_rpcgss_unwrap_failed(task);
2016 goto out;
2017 bad_seqno:
2018 trace_rpcgss_bad_seqno(task, rqstp->rq_seqno, seqno);
2019 goto out;
2020 bad_mic:
2021 trace_rpcgss_verify_mic(task, maj_stat);
2022 goto out;
2023 }
2024
2025 static int
2026 gss_unwrap_resp_priv(struct rpc_task *task, struct rpc_cred *cred,
2027 struct gss_cl_ctx *ctx, struct rpc_rqst *rqstp,
2028 struct xdr_stream *xdr)
2029 {
2030 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
2031 struct kvec *head = rqstp->rq_rcv_buf.head;
2032 struct rpc_auth *auth = cred->cr_auth;
2033 u32 offset, opaque_len, maj_stat;
2034 __be32 *p;
2035
2036 p = xdr_inline_decode(xdr, 2 * sizeof(*p));
2037 if (unlikely(!p))
2038 goto unwrap_failed;
2039 opaque_len = be32_to_cpup(p++);
2040 offset = (u8 *)(p) - (u8 *)head->iov_base;
2041 if (offset + opaque_len > rcv_buf->len)
2042 goto unwrap_failed;
2043
2044 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset,
2045 offset + opaque_len, rcv_buf);
2046 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
2047 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
2048 if (maj_stat != GSS_S_COMPLETE)
2049 goto bad_unwrap;
2050
2051 if (be32_to_cpup(p++) != rqstp->rq_seqno)
2052 goto bad_seqno;
2053
2054
2055
2056
2057 xdr_init_decode(xdr, rcv_buf, p, rqstp);
2058
2059 auth->au_rslack = auth->au_verfsize + 2 + ctx->gc_gss_ctx->slack;
2060 auth->au_ralign = auth->au_verfsize + 2 + ctx->gc_gss_ctx->align;
2061
2062 return 0;
2063 unwrap_failed:
2064 trace_rpcgss_unwrap_failed(task);
2065 return -EIO;
2066 bad_seqno:
2067 trace_rpcgss_bad_seqno(task, rqstp->rq_seqno, be32_to_cpup(--p));
2068 return -EIO;
2069 bad_unwrap:
2070 trace_rpcgss_unwrap(task, maj_stat);
2071 return -EIO;
2072 }
2073
2074 static bool
2075 gss_seq_is_newer(u32 new, u32 old)
2076 {
2077 return (s32)(new - old) > 0;
2078 }
2079
2080 static bool
2081 gss_xmit_need_reencode(struct rpc_task *task)
2082 {
2083 struct rpc_rqst *req = task->tk_rqstp;
2084 struct rpc_cred *cred = req->rq_cred;
2085 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
2086 u32 win, seq_xmit = 0;
2087 bool ret = true;
2088
2089 if (!ctx)
2090 goto out;
2091
2092 if (gss_seq_is_newer(req->rq_seqno, READ_ONCE(ctx->gc_seq)))
2093 goto out_ctx;
2094
2095 seq_xmit = READ_ONCE(ctx->gc_seq_xmit);
2096 while (gss_seq_is_newer(req->rq_seqno, seq_xmit)) {
2097 u32 tmp = seq_xmit;
2098
2099 seq_xmit = cmpxchg(&ctx->gc_seq_xmit, tmp, req->rq_seqno);
2100 if (seq_xmit == tmp) {
2101 ret = false;
2102 goto out_ctx;
2103 }
2104 }
2105
2106 win = ctx->gc_win;
2107 if (win > 0)
2108 ret = !gss_seq_is_newer(req->rq_seqno, seq_xmit - win);
2109
2110 out_ctx:
2111 gss_put_ctx(ctx);
2112 out:
2113 trace_rpcgss_need_reencode(task, seq_xmit, ret);
2114 return ret;
2115 }
2116
2117 static int
2118 gss_unwrap_resp(struct rpc_task *task, struct xdr_stream *xdr)
2119 {
2120 struct rpc_rqst *rqstp = task->tk_rqstp;
2121 struct rpc_cred *cred = rqstp->rq_cred;
2122 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
2123 gc_base);
2124 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
2125 int status = -EIO;
2126
2127 if (ctx->gc_proc != RPC_GSS_PROC_DATA)
2128 goto out_decode;
2129 switch (gss_cred->gc_service) {
2130 case RPC_GSS_SVC_NONE:
2131 status = gss_unwrap_resp_auth(cred);
2132 break;
2133 case RPC_GSS_SVC_INTEGRITY:
2134 status = gss_unwrap_resp_integ(task, cred, ctx, rqstp, xdr);
2135 break;
2136 case RPC_GSS_SVC_PRIVACY:
2137 status = gss_unwrap_resp_priv(task, cred, ctx, rqstp, xdr);
2138 break;
2139 }
2140 if (status)
2141 goto out;
2142
2143 out_decode:
2144 status = rpcauth_unwrap_resp_decode(task, xdr);
2145 out:
2146 gss_put_ctx(ctx);
2147 return status;
2148 }
2149
2150 static const struct rpc_authops authgss_ops = {
2151 .owner = THIS_MODULE,
2152 .au_flavor = RPC_AUTH_GSS,
2153 .au_name = "RPCSEC_GSS",
2154 .create = gss_create,
2155 .destroy = gss_destroy,
2156 .hash_cred = gss_hash_cred,
2157 .lookup_cred = gss_lookup_cred,
2158 .crcreate = gss_create_cred,
2159 .list_pseudoflavors = gss_mech_list_pseudoflavors,
2160 .info2flavor = gss_mech_info2flavor,
2161 .flavor2info = gss_mech_flavor2info,
2162 };
2163
2164 static const struct rpc_credops gss_credops = {
2165 .cr_name = "AUTH_GSS",
2166 .crdestroy = gss_destroy_cred,
2167 .cr_init = gss_cred_init,
2168 .crmatch = gss_match,
2169 .crmarshal = gss_marshal,
2170 .crrefresh = gss_refresh,
2171 .crvalidate = gss_validate,
2172 .crwrap_req = gss_wrap_req,
2173 .crunwrap_resp = gss_unwrap_resp,
2174 .crkey_timeout = gss_key_timeout,
2175 .crstringify_acceptor = gss_stringify_acceptor,
2176 .crneed_reencode = gss_xmit_need_reencode,
2177 };
2178
2179 static const struct rpc_credops gss_nullops = {
2180 .cr_name = "AUTH_GSS",
2181 .crdestroy = gss_destroy_nullcred,
2182 .crmatch = gss_match,
2183 .crmarshal = gss_marshal,
2184 .crrefresh = gss_refresh_null,
2185 .crvalidate = gss_validate,
2186 .crwrap_req = gss_wrap_req,
2187 .crunwrap_resp = gss_unwrap_resp,
2188 .crstringify_acceptor = gss_stringify_acceptor,
2189 };
2190
2191 static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
2192 .upcall = gss_v0_upcall,
2193 .downcall = gss_pipe_downcall,
2194 .destroy_msg = gss_pipe_destroy_msg,
2195 .open_pipe = gss_pipe_open_v0,
2196 .release_pipe = gss_pipe_release,
2197 };
2198
2199 static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
2200 .upcall = gss_v1_upcall,
2201 .downcall = gss_pipe_downcall,
2202 .destroy_msg = gss_pipe_destroy_msg,
2203 .open_pipe = gss_pipe_open_v1,
2204 .release_pipe = gss_pipe_release,
2205 };
2206
2207 static __net_init int rpcsec_gss_init_net(struct net *net)
2208 {
2209 return gss_svc_init_net(net);
2210 }
2211
2212 static __net_exit void rpcsec_gss_exit_net(struct net *net)
2213 {
2214 gss_svc_shutdown_net(net);
2215 }
2216
2217 static struct pernet_operations rpcsec_gss_net_ops = {
2218 .init = rpcsec_gss_init_net,
2219 .exit = rpcsec_gss_exit_net,
2220 };
2221
2222
2223
2224
2225 static int __init init_rpcsec_gss(void)
2226 {
2227 int err = 0;
2228
2229 err = rpcauth_register(&authgss_ops);
2230 if (err)
2231 goto out;
2232 err = gss_svc_init();
2233 if (err)
2234 goto out_unregister;
2235 err = register_pernet_subsys(&rpcsec_gss_net_ops);
2236 if (err)
2237 goto out_svc_exit;
2238 rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
2239 return 0;
2240 out_svc_exit:
2241 gss_svc_shutdown();
2242 out_unregister:
2243 rpcauth_unregister(&authgss_ops);
2244 out:
2245 return err;
2246 }
2247
2248 static void __exit exit_rpcsec_gss(void)
2249 {
2250 unregister_pernet_subsys(&rpcsec_gss_net_ops);
2251 gss_svc_shutdown();
2252 rpcauth_unregister(&authgss_ops);
2253 rcu_barrier();
2254 }
2255
2256 MODULE_ALIAS("rpc-auth-6");
2257 MODULE_LICENSE("GPL");
2258 module_param_named(expired_cred_retry_delay,
2259 gss_expired_cred_retry_delay,
2260 uint, 0644);
2261 MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until "
2262 "the RPC engine retries an expired credential");
2263
2264 module_param_named(key_expire_timeo,
2265 gss_key_expire_timeo,
2266 uint, 0644);
2267 MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a "
2268 "credential keys lifetime where the NFS layer cleans up "
2269 "prior to key expiration");
2270
2271 module_init(init_rpcsec_gss)
2272 module_exit(exit_rpcsec_gss)