Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/net/sunrpc/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 | * $Id$ | |
38 | */ | |
39 | ||
40 | ||
41 | #include <linux/module.h> | |
42 | #include <linux/init.h> | |
43 | #include <linux/types.h> | |
44 | #include <linux/slab.h> | |
1da177e4 | 45 | #include <linux/sched.h> |
2d2da60c | 46 | #include <linux/pagemap.h> |
1da177e4 LT |
47 | #include <linux/sunrpc/clnt.h> |
48 | #include <linux/sunrpc/auth.h> | |
49 | #include <linux/sunrpc/auth_gss.h> | |
50 | #include <linux/sunrpc/svcauth_gss.h> | |
51 | #include <linux/sunrpc/gss_err.h> | |
52 | #include <linux/workqueue.h> | |
53 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
54 | #include <linux/sunrpc/gss_api.h> | |
55 | #include <asm/uaccess.h> | |
56 | ||
57 | static struct rpc_authops authgss_ops; | |
58 | ||
59 | static struct rpc_credops gss_credops; | |
60 | ||
61 | #ifdef RPC_DEBUG | |
62 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
63 | #endif | |
64 | ||
65 | #define NFS_NGROUPS 16 | |
66 | ||
67 | #define GSS_CRED_EXPIRE (60 * HZ) /* XXX: reasonable? */ | |
68 | #define GSS_CRED_SLACK 1024 /* XXX: unused */ | |
69 | /* length of a krb5 verifier (48), plus data added before arguments when | |
70 | * using integrity (two 4-byte integers): */ | |
71 | #define GSS_VERF_SLACK 56 | |
72 | ||
73 | /* XXX this define must match the gssd define | |
74 | * as it is passed to gssd to signal the use of | |
75 | * machine creds should be part of the shared rpc interface */ | |
76 | ||
77 | #define CA_RUN_AS_MACHINE 0x00000200 | |
78 | ||
79 | /* dump the buffer in `emacs-hexl' style */ | |
80 | #define isprint(c) ((c > 0x1f) && (c < 0x7f)) | |
81 | ||
82 | static DEFINE_RWLOCK(gss_ctx_lock); | |
83 | ||
84 | struct gss_auth { | |
85 | struct rpc_auth rpc_auth; | |
86 | struct gss_api_mech *mech; | |
87 | enum rpc_gss_svc service; | |
88 | struct list_head upcalls; | |
89 | struct rpc_clnt *client; | |
90 | struct dentry *dentry; | |
f134585a | 91 | char path[48]; |
1da177e4 LT |
92 | spinlock_t lock; |
93 | }; | |
94 | ||
95 | static void gss_destroy_ctx(struct gss_cl_ctx *); | |
96 | static struct rpc_pipe_ops gss_upcall_ops; | |
97 | ||
98 | void | |
99 | print_hexl(u32 *p, u_int length, u_int offset) | |
100 | { | |
101 | u_int i, j, jm; | |
102 | u8 c, *cp; | |
103 | ||
104 | dprintk("RPC: print_hexl: length %d\n",length); | |
105 | dprintk("\n"); | |
106 | cp = (u8 *) p; | |
107 | ||
108 | for (i = 0; i < length; i += 0x10) { | |
109 | dprintk(" %04x: ", (u_int)(i + offset)); | |
110 | jm = length - i; | |
111 | jm = jm > 16 ? 16 : jm; | |
112 | ||
113 | for (j = 0; j < jm; j++) { | |
114 | if ((j % 2) == 1) | |
115 | dprintk("%02x ", (u_int)cp[i+j]); | |
116 | else | |
117 | dprintk("%02x", (u_int)cp[i+j]); | |
118 | } | |
119 | for (; j < 16; j++) { | |
120 | if ((j % 2) == 1) | |
121 | dprintk(" "); | |
122 | else | |
123 | dprintk(" "); | |
124 | } | |
125 | dprintk(" "); | |
126 | ||
127 | for (j = 0; j < jm; j++) { | |
128 | c = cp[i+j]; | |
129 | c = isprint(c) ? c : '.'; | |
130 | dprintk("%c", c); | |
131 | } | |
132 | dprintk("\n"); | |
133 | } | |
134 | } | |
135 | ||
136 | EXPORT_SYMBOL(print_hexl); | |
137 | ||
138 | static inline struct gss_cl_ctx * | |
139 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
140 | { | |
141 | atomic_inc(&ctx->count); | |
142 | return ctx; | |
143 | } | |
144 | ||
145 | static inline void | |
146 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
147 | { | |
148 | if (atomic_dec_and_test(&ctx->count)) | |
149 | gss_destroy_ctx(ctx); | |
150 | } | |
151 | ||
152 | static void | |
153 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
154 | { | |
155 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
156 | struct gss_cl_ctx *old; | |
157 | write_lock(&gss_ctx_lock); | |
158 | old = gss_cred->gc_ctx; | |
159 | gss_cred->gc_ctx = ctx; | |
160 | cred->cr_flags |= RPCAUTH_CRED_UPTODATE; | |
161 | write_unlock(&gss_ctx_lock); | |
162 | if (old) | |
163 | gss_put_ctx(old); | |
164 | } | |
165 | ||
166 | static int | |
167 | gss_cred_is_uptodate_ctx(struct rpc_cred *cred) | |
168 | { | |
169 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
170 | int res = 0; | |
171 | ||
172 | read_lock(&gss_ctx_lock); | |
173 | if ((cred->cr_flags & RPCAUTH_CRED_UPTODATE) && gss_cred->gc_ctx) | |
174 | res = 1; | |
175 | read_unlock(&gss_ctx_lock); | |
176 | return res; | |
177 | } | |
178 | ||
179 | static const void * | |
180 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
181 | { | |
182 | const void *q = (const void *)((const char *)p + len); | |
183 | if (unlikely(q > end || q < p)) | |
184 | return ERR_PTR(-EFAULT); | |
185 | memcpy(res, p, len); | |
186 | return q; | |
187 | } | |
188 | ||
189 | static inline const void * | |
190 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
191 | { | |
192 | const void *q; | |
193 | unsigned int len; | |
194 | ||
195 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
196 | if (IS_ERR(p)) | |
197 | return p; | |
198 | q = (const void *)((const char *)p + len); | |
199 | if (unlikely(q > end || q < p)) | |
200 | return ERR_PTR(-EFAULT); | |
201 | dest->data = kmalloc(len, GFP_KERNEL); | |
202 | if (unlikely(dest->data == NULL)) | |
203 | return ERR_PTR(-ENOMEM); | |
204 | dest->len = len; | |
205 | memcpy(dest->data, p, len); | |
206 | return q; | |
207 | } | |
208 | ||
209 | static struct gss_cl_ctx * | |
210 | gss_cred_get_ctx(struct rpc_cred *cred) | |
211 | { | |
212 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
213 | struct gss_cl_ctx *ctx = NULL; | |
214 | ||
215 | read_lock(&gss_ctx_lock); | |
216 | if (gss_cred->gc_ctx) | |
217 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
218 | read_unlock(&gss_ctx_lock); | |
219 | return ctx; | |
220 | } | |
221 | ||
222 | static struct gss_cl_ctx * | |
223 | gss_alloc_context(void) | |
224 | { | |
225 | struct gss_cl_ctx *ctx; | |
226 | ||
227 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
228 | if (ctx != NULL) { | |
229 | memset(ctx, 0, sizeof(*ctx)); | |
230 | ctx->gc_proc = RPC_GSS_PROC_DATA; | |
231 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
232 | spin_lock_init(&ctx->gc_seq_lock); | |
233 | atomic_set(&ctx->count,1); | |
234 | } | |
235 | return ctx; | |
236 | } | |
237 | ||
238 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
239 | static const void * | |
240 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
241 | { | |
242 | const void *q; | |
243 | unsigned int seclen; | |
244 | unsigned int timeout; | |
245 | u32 window_size; | |
246 | int ret; | |
247 | ||
248 | /* First unsigned int gives the lifetime (in seconds) of the cred */ | |
249 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); | |
250 | if (IS_ERR(p)) | |
251 | goto err; | |
252 | if (timeout == 0) | |
253 | timeout = GSSD_MIN_TIMEOUT; | |
254 | ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; | |
255 | /* Sequence number window. Determines the maximum number of simultaneous requests */ | |
256 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); | |
257 | if (IS_ERR(p)) | |
258 | goto err; | |
259 | ctx->gc_win = window_size; | |
260 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
261 | if (ctx->gc_win == 0) { | |
262 | /* in which case, p points to an error code which we ignore */ | |
263 | p = ERR_PTR(-EACCES); | |
264 | goto err; | |
265 | } | |
266 | /* copy the opaque wire context */ | |
267 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
268 | if (IS_ERR(p)) | |
269 | goto err; | |
270 | /* import the opaque security context */ | |
271 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
272 | if (IS_ERR(p)) | |
273 | goto err; | |
274 | q = (const void *)((const char *)p + seclen); | |
275 | if (unlikely(q > end || q < p)) { | |
276 | p = ERR_PTR(-EFAULT); | |
277 | goto err; | |
278 | } | |
279 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); | |
280 | if (ret < 0) { | |
281 | p = ERR_PTR(ret); | |
282 | goto err; | |
283 | } | |
284 | return q; | |
285 | err: | |
286 | dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); | |
287 | return p; | |
288 | } | |
289 | ||
290 | ||
291 | struct gss_upcall_msg { | |
292 | atomic_t count; | |
293 | uid_t uid; | |
294 | struct rpc_pipe_msg msg; | |
295 | struct list_head list; | |
296 | struct gss_auth *auth; | |
297 | struct rpc_wait_queue rpc_waitqueue; | |
298 | wait_queue_head_t waitqueue; | |
299 | struct gss_cl_ctx *ctx; | |
300 | }; | |
301 | ||
302 | static void | |
303 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
304 | { | |
305 | if (!atomic_dec_and_test(&gss_msg->count)) | |
306 | return; | |
307 | BUG_ON(!list_empty(&gss_msg->list)); | |
308 | if (gss_msg->ctx != NULL) | |
309 | gss_put_ctx(gss_msg->ctx); | |
310 | kfree(gss_msg); | |
311 | } | |
312 | ||
313 | static struct gss_upcall_msg * | |
314 | __gss_find_upcall(struct gss_auth *gss_auth, uid_t uid) | |
315 | { | |
316 | struct gss_upcall_msg *pos; | |
317 | list_for_each_entry(pos, &gss_auth->upcalls, list) { | |
318 | if (pos->uid != uid) | |
319 | continue; | |
320 | atomic_inc(&pos->count); | |
321 | dprintk("RPC: gss_find_upcall found msg %p\n", pos); | |
322 | return pos; | |
323 | } | |
324 | dprintk("RPC: gss_find_upcall found nothing\n"); | |
325 | return NULL; | |
326 | } | |
327 | ||
328 | /* Try to add a upcall to the pipefs queue. | |
329 | * If an upcall owned by our uid already exists, then we return a reference | |
330 | * to that upcall instead of adding the new upcall. | |
331 | */ | |
332 | static inline struct gss_upcall_msg * | |
333 | gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) | |
334 | { | |
335 | struct gss_upcall_msg *old; | |
336 | ||
337 | spin_lock(&gss_auth->lock); | |
338 | old = __gss_find_upcall(gss_auth, gss_msg->uid); | |
339 | if (old == NULL) { | |
340 | atomic_inc(&gss_msg->count); | |
341 | list_add(&gss_msg->list, &gss_auth->upcalls); | |
342 | } else | |
343 | gss_msg = old; | |
344 | spin_unlock(&gss_auth->lock); | |
345 | return gss_msg; | |
346 | } | |
347 | ||
348 | static void | |
349 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
350 | { | |
351 | if (list_empty(&gss_msg->list)) | |
352 | return; | |
353 | list_del_init(&gss_msg->list); | |
354 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
355 | wake_up_all(&gss_msg->waitqueue); | |
356 | atomic_dec(&gss_msg->count); | |
357 | } | |
358 | ||
359 | static void | |
360 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
361 | { | |
362 | struct gss_auth *gss_auth = gss_msg->auth; | |
363 | ||
364 | spin_lock(&gss_auth->lock); | |
365 | __gss_unhash_msg(gss_msg); | |
366 | spin_unlock(&gss_auth->lock); | |
367 | } | |
368 | ||
369 | static void | |
370 | gss_upcall_callback(struct rpc_task *task) | |
371 | { | |
372 | struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, | |
373 | struct gss_cred, gc_base); | |
374 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
375 | ||
376 | BUG_ON(gss_msg == NULL); | |
377 | if (gss_msg->ctx) | |
378 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); | |
379 | else | |
380 | task->tk_status = gss_msg->msg.errno; | |
381 | spin_lock(&gss_msg->auth->lock); | |
382 | gss_cred->gc_upcall = NULL; | |
383 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
384 | spin_unlock(&gss_msg->auth->lock); | |
385 | gss_release_msg(gss_msg); | |
386 | } | |
387 | ||
388 | static inline struct gss_upcall_msg * | |
389 | gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) | |
390 | { | |
391 | struct gss_upcall_msg *gss_msg; | |
392 | ||
393 | gss_msg = kmalloc(sizeof(*gss_msg), GFP_KERNEL); | |
394 | if (gss_msg != NULL) { | |
395 | memset(gss_msg, 0, sizeof(*gss_msg)); | |
396 | INIT_LIST_HEAD(&gss_msg->list); | |
397 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
398 | init_waitqueue_head(&gss_msg->waitqueue); | |
399 | atomic_set(&gss_msg->count, 1); | |
400 | gss_msg->msg.data = &gss_msg->uid; | |
401 | gss_msg->msg.len = sizeof(gss_msg->uid); | |
402 | gss_msg->uid = uid; | |
403 | gss_msg->auth = gss_auth; | |
404 | } | |
405 | return gss_msg; | |
406 | } | |
407 | ||
408 | static struct gss_upcall_msg * | |
409 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
410 | { | |
411 | struct gss_upcall_msg *gss_new, *gss_msg; | |
412 | ||
413 | gss_new = gss_alloc_msg(gss_auth, cred->cr_uid); | |
414 | if (gss_new == NULL) | |
415 | return ERR_PTR(-ENOMEM); | |
416 | gss_msg = gss_add_msg(gss_auth, gss_new); | |
417 | if (gss_msg == gss_new) { | |
418 | int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); | |
419 | if (res) { | |
420 | gss_unhash_msg(gss_new); | |
421 | gss_msg = ERR_PTR(res); | |
422 | } | |
423 | } else | |
424 | gss_release_msg(gss_new); | |
425 | return gss_msg; | |
426 | } | |
427 | ||
428 | static inline int | |
429 | gss_refresh_upcall(struct rpc_task *task) | |
430 | { | |
431 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
432 | struct gss_auth *gss_auth = container_of(task->tk_client->cl_auth, | |
433 | struct gss_auth, rpc_auth); | |
434 | struct gss_cred *gss_cred = container_of(cred, | |
435 | struct gss_cred, gc_base); | |
436 | struct gss_upcall_msg *gss_msg; | |
437 | int err = 0; | |
438 | ||
439 | dprintk("RPC: %4u gss_refresh_upcall for uid %u\n", task->tk_pid, cred->cr_uid); | |
440 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); | |
441 | if (IS_ERR(gss_msg)) { | |
442 | err = PTR_ERR(gss_msg); | |
443 | goto out; | |
444 | } | |
445 | spin_lock(&gss_auth->lock); | |
446 | if (gss_cred->gc_upcall != NULL) | |
447 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL); | |
448 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { | |
449 | task->tk_timeout = 0; | |
450 | gss_cred->gc_upcall = gss_msg; | |
451 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
452 | atomic_inc(&gss_msg->count); | |
453 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL); | |
454 | } else | |
455 | err = gss_msg->msg.errno; | |
456 | spin_unlock(&gss_auth->lock); | |
457 | gss_release_msg(gss_msg); | |
458 | out: | |
459 | dprintk("RPC: %4u gss_refresh_upcall for uid %u result %d\n", task->tk_pid, | |
460 | cred->cr_uid, err); | |
461 | return err; | |
462 | } | |
463 | ||
464 | static inline int | |
465 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
466 | { | |
467 | struct rpc_cred *cred = &gss_cred->gc_base; | |
468 | struct gss_upcall_msg *gss_msg; | |
469 | DEFINE_WAIT(wait); | |
470 | int err = 0; | |
471 | ||
472 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); | |
473 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); | |
474 | if (IS_ERR(gss_msg)) { | |
475 | err = PTR_ERR(gss_msg); | |
476 | goto out; | |
477 | } | |
478 | for (;;) { | |
479 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); | |
480 | spin_lock(&gss_auth->lock); | |
481 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { | |
482 | spin_unlock(&gss_auth->lock); | |
483 | break; | |
484 | } | |
485 | spin_unlock(&gss_auth->lock); | |
486 | if (signalled()) { | |
487 | err = -ERESTARTSYS; | |
488 | goto out_intr; | |
489 | } | |
490 | schedule(); | |
491 | } | |
492 | if (gss_msg->ctx) | |
493 | gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx)); | |
494 | else | |
495 | err = gss_msg->msg.errno; | |
496 | out_intr: | |
497 | finish_wait(&gss_msg->waitqueue, &wait); | |
498 | gss_release_msg(gss_msg); | |
499 | out: | |
500 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", cred->cr_uid, err); | |
501 | return err; | |
502 | } | |
503 | ||
504 | static ssize_t | |
505 | gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, | |
506 | char __user *dst, size_t buflen) | |
507 | { | |
508 | char *data = (char *)msg->data + msg->copied; | |
509 | ssize_t mlen = msg->len; | |
510 | ssize_t left; | |
511 | ||
512 | if (mlen > buflen) | |
513 | mlen = buflen; | |
514 | left = copy_to_user(dst, data, mlen); | |
515 | if (left < 0) { | |
516 | msg->errno = left; | |
517 | return left; | |
518 | } | |
519 | mlen -= left; | |
520 | msg->copied += mlen; | |
521 | msg->errno = 0; | |
522 | return mlen; | |
523 | } | |
524 | ||
525 | #define MSG_BUF_MAXSIZE 1024 | |
526 | ||
527 | static ssize_t | |
528 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
529 | { | |
530 | const void *p, *end; | |
531 | void *buf; | |
532 | struct rpc_clnt *clnt; | |
533 | struct gss_auth *gss_auth; | |
534 | struct rpc_cred *cred; | |
535 | struct gss_upcall_msg *gss_msg; | |
536 | struct gss_cl_ctx *ctx; | |
537 | uid_t uid; | |
538 | int err = -EFBIG; | |
539 | ||
540 | if (mlen > MSG_BUF_MAXSIZE) | |
541 | goto out; | |
542 | err = -ENOMEM; | |
543 | buf = kmalloc(mlen, GFP_KERNEL); | |
544 | if (!buf) | |
545 | goto out; | |
546 | ||
547 | clnt = RPC_I(filp->f_dentry->d_inode)->private; | |
548 | err = -EFAULT; | |
549 | if (copy_from_user(buf, src, mlen)) | |
550 | goto err; | |
551 | ||
552 | end = (const void *)((char *)buf + mlen); | |
553 | p = simple_get_bytes(buf, end, &uid, sizeof(uid)); | |
554 | if (IS_ERR(p)) { | |
555 | err = PTR_ERR(p); | |
556 | goto err; | |
557 | } | |
558 | ||
559 | err = -ENOMEM; | |
560 | ctx = gss_alloc_context(); | |
561 | if (ctx == NULL) | |
562 | goto err; | |
563 | err = 0; | |
564 | gss_auth = container_of(clnt->cl_auth, struct gss_auth, rpc_auth); | |
565 | p = gss_fill_context(p, end, ctx, gss_auth->mech); | |
566 | if (IS_ERR(p)) { | |
567 | err = PTR_ERR(p); | |
568 | if (err != -EACCES) | |
569 | goto err_put_ctx; | |
570 | } | |
571 | spin_lock(&gss_auth->lock); | |
572 | gss_msg = __gss_find_upcall(gss_auth, uid); | |
573 | if (gss_msg) { | |
574 | if (err == 0 && gss_msg->ctx == NULL) | |
575 | gss_msg->ctx = gss_get_ctx(ctx); | |
576 | gss_msg->msg.errno = err; | |
577 | __gss_unhash_msg(gss_msg); | |
578 | spin_unlock(&gss_auth->lock); | |
579 | gss_release_msg(gss_msg); | |
580 | } else { | |
581 | struct auth_cred acred = { .uid = uid }; | |
582 | spin_unlock(&gss_auth->lock); | |
583 | cred = rpcauth_lookup_credcache(clnt->cl_auth, &acred, 0); | |
584 | if (IS_ERR(cred)) { | |
585 | err = PTR_ERR(cred); | |
586 | goto err_put_ctx; | |
587 | } | |
588 | gss_cred_set_ctx(cred, gss_get_ctx(ctx)); | |
589 | } | |
590 | gss_put_ctx(ctx); | |
591 | kfree(buf); | |
592 | dprintk("RPC: gss_pipe_downcall returning length %Zu\n", mlen); | |
593 | return mlen; | |
594 | err_put_ctx: | |
595 | gss_put_ctx(ctx); | |
596 | err: | |
597 | kfree(buf); | |
598 | out: | |
599 | dprintk("RPC: gss_pipe_downcall returning %d\n", err); | |
600 | return err; | |
601 | } | |
602 | ||
603 | static void | |
604 | gss_pipe_release(struct inode *inode) | |
605 | { | |
606 | struct rpc_inode *rpci = RPC_I(inode); | |
607 | struct rpc_clnt *clnt; | |
608 | struct rpc_auth *auth; | |
609 | struct gss_auth *gss_auth; | |
610 | ||
611 | clnt = rpci->private; | |
612 | auth = clnt->cl_auth; | |
613 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
614 | spin_lock(&gss_auth->lock); | |
615 | while (!list_empty(&gss_auth->upcalls)) { | |
616 | struct gss_upcall_msg *gss_msg; | |
617 | ||
618 | gss_msg = list_entry(gss_auth->upcalls.next, | |
619 | struct gss_upcall_msg, list); | |
620 | gss_msg->msg.errno = -EPIPE; | |
621 | atomic_inc(&gss_msg->count); | |
622 | __gss_unhash_msg(gss_msg); | |
623 | spin_unlock(&gss_auth->lock); | |
624 | gss_release_msg(gss_msg); | |
625 | spin_lock(&gss_auth->lock); | |
626 | } | |
627 | spin_unlock(&gss_auth->lock); | |
628 | } | |
629 | ||
630 | static void | |
631 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
632 | { | |
633 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
634 | static unsigned long ratelimit; | |
635 | ||
636 | if (msg->errno < 0) { | |
637 | dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", | |
638 | gss_msg); | |
639 | atomic_inc(&gss_msg->count); | |
640 | gss_unhash_msg(gss_msg); | |
48e49187 | 641 | if (msg->errno == -ETIMEDOUT) { |
1da177e4 LT |
642 | unsigned long now = jiffies; |
643 | if (time_after(now, ratelimit)) { | |
644 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" | |
645 | "Please check user daemon is running!\n"); | |
646 | ratelimit = now + 15*HZ; | |
647 | } | |
648 | } | |
649 | gss_release_msg(gss_msg); | |
650 | } | |
651 | } | |
652 | ||
653 | /* | |
654 | * NOTE: we have the opportunity to use different | |
655 | * parameters based on the input flavor (which must be a pseudoflavor) | |
656 | */ | |
657 | static struct rpc_auth * | |
658 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
659 | { | |
660 | struct gss_auth *gss_auth; | |
661 | struct rpc_auth * auth; | |
6a19275a | 662 | int err = -ENOMEM; /* XXX? */ |
1da177e4 LT |
663 | |
664 | dprintk("RPC: creating GSS authenticator for client %p\n",clnt); | |
665 | ||
666 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 667 | return ERR_PTR(err); |
1da177e4 LT |
668 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
669 | goto out_dec; | |
670 | gss_auth->client = clnt; | |
6a19275a | 671 | err = -EINVAL; |
1da177e4 LT |
672 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
673 | if (!gss_auth->mech) { | |
674 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!", | |
675 | __FUNCTION__, flavor); | |
676 | goto err_free; | |
677 | } | |
678 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
679 | if (gss_auth->service == 0) |
680 | goto err_put_mech; | |
1da177e4 LT |
681 | INIT_LIST_HEAD(&gss_auth->upcalls); |
682 | spin_lock_init(&gss_auth->lock); | |
683 | auth = &gss_auth->rpc_auth; | |
684 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
685 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
686 | auth->au_ops = &authgss_ops; | |
687 | auth->au_flavor = flavor; | |
688 | atomic_set(&auth->au_count, 1); | |
689 | ||
6a19275a BF |
690 | err = rpcauth_init_credcache(auth, GSS_CRED_EXPIRE); |
691 | if (err) | |
1da177e4 LT |
692 | goto err_put_mech; |
693 | ||
f134585a TM |
694 | snprintf(gss_auth->path, sizeof(gss_auth->path), "%s/%s", |
695 | clnt->cl_pathname, | |
696 | gss_auth->mech->gm_name); | |
697 | gss_auth->dentry = rpc_mkpipe(gss_auth->path, clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
6a19275a BF |
698 | if (IS_ERR(gss_auth->dentry)) { |
699 | err = PTR_ERR(gss_auth->dentry); | |
1da177e4 | 700 | goto err_put_mech; |
6a19275a | 701 | } |
1da177e4 LT |
702 | |
703 | return auth; | |
704 | err_put_mech: | |
705 | gss_mech_put(gss_auth->mech); | |
706 | err_free: | |
707 | kfree(gss_auth); | |
708 | out_dec: | |
709 | module_put(THIS_MODULE); | |
6a19275a | 710 | return ERR_PTR(err); |
1da177e4 LT |
711 | } |
712 | ||
713 | static void | |
714 | gss_destroy(struct rpc_auth *auth) | |
715 | { | |
716 | struct gss_auth *gss_auth; | |
717 | ||
718 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", | |
719 | auth, auth->au_flavor); | |
720 | ||
721 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
f134585a | 722 | rpc_unlink(gss_auth->path); |
1da177e4 LT |
723 | gss_mech_put(gss_auth->mech); |
724 | ||
725 | rpcauth_free_credcache(auth); | |
726 | kfree(gss_auth); | |
727 | module_put(THIS_MODULE); | |
728 | } | |
729 | ||
730 | /* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure | |
731 | * to create a new cred or context, so they check that things have been | |
732 | * allocated before freeing them. */ | |
733 | static void | |
734 | gss_destroy_ctx(struct gss_cl_ctx *ctx) | |
735 | { | |
736 | dprintk("RPC: gss_destroy_ctx\n"); | |
737 | ||
738 | if (ctx->gc_gss_ctx) | |
739 | gss_delete_sec_context(&ctx->gc_gss_ctx); | |
740 | ||
741 | kfree(ctx->gc_wire_ctx.data); | |
742 | kfree(ctx); | |
743 | } | |
744 | ||
745 | static void | |
746 | gss_destroy_cred(struct rpc_cred *rc) | |
747 | { | |
748 | struct gss_cred *cred = container_of(rc, struct gss_cred, gc_base); | |
749 | ||
750 | dprintk("RPC: gss_destroy_cred \n"); | |
751 | ||
752 | if (cred->gc_ctx) | |
753 | gss_put_ctx(cred->gc_ctx); | |
754 | kfree(cred); | |
755 | } | |
756 | ||
757 | /* | |
758 | * Lookup RPCSEC_GSS cred for the current process | |
759 | */ | |
760 | static struct rpc_cred * | |
761 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int taskflags) | |
762 | { | |
763 | return rpcauth_lookup_credcache(auth, acred, taskflags); | |
764 | } | |
765 | ||
766 | static struct rpc_cred * | |
767 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int taskflags) | |
768 | { | |
769 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
770 | struct gss_cred *cred = NULL; | |
771 | int err = -ENOMEM; | |
772 | ||
773 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", | |
774 | acred->uid, auth->au_flavor); | |
775 | ||
776 | if (!(cred = kmalloc(sizeof(*cred), GFP_KERNEL))) | |
777 | goto out_err; | |
778 | ||
779 | memset(cred, 0, sizeof(*cred)); | |
780 | atomic_set(&cred->gc_count, 1); | |
781 | cred->gc_uid = acred->uid; | |
782 | /* | |
783 | * Note: in order to force a call to call_refresh(), we deliberately | |
784 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
785 | */ | |
786 | cred->gc_flags = 0; | |
787 | cred->gc_base.cr_ops = &gss_credops; | |
788 | cred->gc_service = gss_auth->service; | |
48e49187 TM |
789 | do { |
790 | err = gss_create_upcall(gss_auth, cred); | |
791 | } while (err == -EAGAIN); | |
1da177e4 LT |
792 | if (err < 0) |
793 | goto out_err; | |
794 | ||
795 | return &cred->gc_base; | |
796 | ||
797 | out_err: | |
798 | dprintk("RPC: gss_create_cred failed with error %d\n", err); | |
799 | if (cred) gss_destroy_cred(&cred->gc_base); | |
800 | return ERR_PTR(err); | |
801 | } | |
802 | ||
803 | static int | |
804 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int taskflags) | |
805 | { | |
806 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
807 | ||
808 | /* Don't match with creds that have expired. */ | |
809 | if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) | |
810 | return 0; | |
811 | return (rc->cr_uid == acred->uid); | |
812 | } | |
813 | ||
814 | /* | |
815 | * Marshal credentials. | |
816 | * Maybe we should keep a cached credential for performance reasons. | |
817 | */ | |
818 | static u32 * | |
819 | gss_marshal(struct rpc_task *task, u32 *p) | |
820 | { | |
821 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
822 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
823 | gc_base); | |
824 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
825 | u32 *cred_len; | |
826 | struct rpc_rqst *req = task->tk_rqstp; | |
827 | u32 maj_stat = 0; | |
828 | struct xdr_netobj mic; | |
829 | struct kvec iov; | |
830 | struct xdr_buf verf_buf; | |
831 | ||
832 | dprintk("RPC: %4u gss_marshal\n", task->tk_pid); | |
833 | ||
834 | *p++ = htonl(RPC_AUTH_GSS); | |
835 | cred_len = p++; | |
836 | ||
837 | spin_lock(&ctx->gc_seq_lock); | |
838 | req->rq_seqno = ctx->gc_seq++; | |
839 | spin_unlock(&ctx->gc_seq_lock); | |
840 | ||
841 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
842 | *p++ = htonl((u32) ctx->gc_proc); | |
843 | *p++ = htonl((u32) req->rq_seqno); | |
844 | *p++ = htonl((u32) gss_cred->gc_service); | |
845 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
846 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
847 | ||
848 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
849 | * starting with the xid and ending at the end of the credential: */ | |
808012fb CL |
850 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
851 | req->rq_snd_buf.head[0].iov_base); | |
1da177e4 LT |
852 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
853 | xdr_buf_from_iov(&iov, &verf_buf); | |
854 | ||
855 | /* set verifier flavor*/ | |
856 | *p++ = htonl(RPC_AUTH_GSS); | |
857 | ||
858 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 859 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 LT |
860 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
861 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
862 | } else if (maj_stat != 0) { | |
863 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
864 | goto out_put_ctx; | |
865 | } | |
866 | p = xdr_encode_opaque(p, NULL, mic.len); | |
867 | gss_put_ctx(ctx); | |
868 | return p; | |
869 | out_put_ctx: | |
870 | gss_put_ctx(ctx); | |
871 | return NULL; | |
872 | } | |
873 | ||
874 | /* | |
875 | * Refresh credentials. XXX - finish | |
876 | */ | |
877 | static int | |
878 | gss_refresh(struct rpc_task *task) | |
879 | { | |
880 | ||
881 | if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) | |
882 | return gss_refresh_upcall(task); | |
883 | return 0; | |
884 | } | |
885 | ||
886 | static u32 * | |
887 | gss_validate(struct rpc_task *task, u32 *p) | |
888 | { | |
889 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1da177e4 | 890 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
00fd6e14 | 891 | u32 seq; |
1da177e4 LT |
892 | struct kvec iov; |
893 | struct xdr_buf verf_buf; | |
894 | struct xdr_netobj mic; | |
895 | u32 flav,len; | |
896 | u32 maj_stat; | |
897 | ||
898 | dprintk("RPC: %4u gss_validate\n", task->tk_pid); | |
899 | ||
900 | flav = ntohl(*p++); | |
901 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
902 | goto out_bad; | |
903 | if (flav != RPC_AUTH_GSS) | |
904 | goto out_bad; | |
905 | seq = htonl(task->tk_rqstp->rq_seqno); | |
906 | iov.iov_base = &seq; | |
907 | iov.iov_len = sizeof(seq); | |
908 | xdr_buf_from_iov(&iov, &verf_buf); | |
909 | mic.data = (u8 *)p; | |
910 | mic.len = len; | |
911 | ||
00fd6e14 | 912 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 LT |
913 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
914 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
915 | if (maj_stat) | |
916 | goto out_bad; | |
24b2605b BF |
917 | /* We leave it to unwrap to calculate au_rslack. For now we just |
918 | * calculate the length of the verifier: */ | |
919 | task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2; | |
1da177e4 LT |
920 | gss_put_ctx(ctx); |
921 | dprintk("RPC: %4u GSS gss_validate: gss_verify_mic succeeded.\n", | |
922 | task->tk_pid); | |
923 | return p + XDR_QUADLEN(len); | |
924 | out_bad: | |
925 | gss_put_ctx(ctx); | |
926 | dprintk("RPC: %4u gss_validate failed.\n", task->tk_pid); | |
927 | return NULL; | |
928 | } | |
929 | ||
930 | static inline int | |
931 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
932 | kxdrproc_t encode, struct rpc_rqst *rqstp, u32 *p, void *obj) | |
933 | { | |
934 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
935 | struct xdr_buf integ_buf; | |
936 | u32 *integ_len = NULL; | |
937 | struct xdr_netobj mic; | |
938 | u32 offset, *q; | |
939 | struct kvec *iov; | |
940 | u32 maj_stat = 0; | |
941 | int status = -EIO; | |
942 | ||
943 | integ_len = p++; | |
944 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
945 | *p++ = htonl(rqstp->rq_seqno); | |
946 | ||
947 | status = encode(rqstp, p, obj); | |
948 | if (status) | |
949 | return status; | |
950 | ||
951 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
952 | offset, snd_buf->len - offset)) | |
953 | return status; | |
954 | *integ_len = htonl(integ_buf.len); | |
955 | ||
956 | /* guess whether we're in the head or the tail: */ | |
957 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
958 | iov = snd_buf->tail; | |
959 | else | |
960 | iov = snd_buf->head; | |
961 | p = iov->iov_base + iov->iov_len; | |
962 | mic.data = (u8 *)(p + 1); | |
963 | ||
00fd6e14 | 964 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
965 | status = -EIO; /* XXX? */ |
966 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
967 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
968 | else if (maj_stat) | |
969 | return status; | |
970 | q = xdr_encode_opaque(p, NULL, mic.len); | |
971 | ||
972 | offset = (u8 *)q - (u8 *)p; | |
973 | iov->iov_len += offset; | |
974 | snd_buf->len += offset; | |
975 | return 0; | |
976 | } | |
977 | ||
2d2da60c BF |
978 | static void |
979 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
980 | { | |
981 | int i; | |
982 | ||
983 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
984 | __free_page(rqstp->rq_enc_pages[i]); | |
985 | kfree(rqstp->rq_enc_pages); | |
986 | } | |
987 | ||
988 | static int | |
989 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
990 | { | |
991 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
992 | int first, last, i; | |
993 | ||
994 | if (snd_buf->page_len == 0) { | |
995 | rqstp->rq_enc_pages_num = 0; | |
996 | return 0; | |
997 | } | |
998 | ||
999 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1000 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1001 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1002 | rqstp->rq_enc_pages | |
1003 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1004 | GFP_NOFS); | |
1005 | if (!rqstp->rq_enc_pages) | |
1006 | goto out; | |
1007 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1008 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1009 | if (rqstp->rq_enc_pages[i] == NULL) | |
1010 | goto out_free; | |
1011 | } | |
1012 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1013 | return 0; | |
1014 | out_free: | |
1015 | for (i--; i >= 0; i--) { | |
1016 | __free_page(rqstp->rq_enc_pages[i]); | |
1017 | } | |
1018 | out: | |
1019 | return -EAGAIN; | |
1020 | } | |
1021 | ||
1022 | static inline int | |
1023 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
1024 | kxdrproc_t encode, struct rpc_rqst *rqstp, u32 *p, void *obj) | |
1025 | { | |
1026 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1027 | u32 offset; | |
1028 | u32 maj_stat; | |
1029 | int status; | |
1030 | u32 *opaque_len; | |
1031 | struct page **inpages; | |
1032 | int first; | |
1033 | int pad; | |
1034 | struct kvec *iov; | |
1035 | char *tmp; | |
1036 | ||
1037 | opaque_len = p++; | |
1038 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1039 | *p++ = htonl(rqstp->rq_seqno); | |
1040 | ||
1041 | status = encode(rqstp, p, obj); | |
1042 | if (status) | |
1043 | return status; | |
1044 | ||
1045 | status = alloc_enc_pages(rqstp); | |
1046 | if (status) | |
1047 | return status; | |
1048 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1049 | inpages = snd_buf->pages + first; | |
1050 | snd_buf->pages = rqstp->rq_enc_pages; | |
1051 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
1052 | /* Give the tail its own page, in case we need extra space in the | |
1053 | * head when wrapping: */ | |
1054 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { | |
1055 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1056 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1057 | snd_buf->tail[0].iov_base = tmp; | |
1058 | } | |
00fd6e14 | 1059 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
2d2da60c BF |
1060 | /* RPC_SLACK_SPACE should prevent this ever happening: */ |
1061 | BUG_ON(snd_buf->len > snd_buf->buflen); | |
1062 | status = -EIO; | |
1063 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was | |
1064 | * done anyway, so it's safe to put the request on the wire: */ | |
1065 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
1066 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
1067 | else if (maj_stat) | |
1068 | return status; | |
1069 | ||
1070 | *opaque_len = htonl(snd_buf->len - offset); | |
1071 | /* guess whether we're in the head or the tail: */ | |
1072 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1073 | iov = snd_buf->tail; | |
1074 | else | |
1075 | iov = snd_buf->head; | |
1076 | p = iov->iov_base + iov->iov_len; | |
1077 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1078 | memset(p, 0, pad); | |
1079 | iov->iov_len += pad; | |
1080 | snd_buf->len += pad; | |
1081 | ||
1082 | return 0; | |
1083 | } | |
1084 | ||
1da177e4 LT |
1085 | static int |
1086 | gss_wrap_req(struct rpc_task *task, | |
1087 | kxdrproc_t encode, void *rqstp, u32 *p, void *obj) | |
1088 | { | |
1089 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1090 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1091 | gc_base); | |
1092 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1093 | int status = -EIO; | |
1094 | ||
1095 | dprintk("RPC: %4u gss_wrap_req\n", task->tk_pid); | |
1096 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { | |
1097 | /* The spec seems a little ambiguous here, but I think that not | |
1098 | * wrapping context destruction requests makes the most sense. | |
1099 | */ | |
1100 | status = encode(rqstp, p, obj); | |
1101 | goto out; | |
1102 | } | |
1103 | switch (gss_cred->gc_service) { | |
1104 | case RPC_GSS_SVC_NONE: | |
1105 | status = encode(rqstp, p, obj); | |
1106 | break; | |
1107 | case RPC_GSS_SVC_INTEGRITY: | |
1108 | status = gss_wrap_req_integ(cred, ctx, encode, | |
1109 | rqstp, p, obj); | |
1110 | break; | |
1111 | case RPC_GSS_SVC_PRIVACY: | |
2d2da60c BF |
1112 | status = gss_wrap_req_priv(cred, ctx, encode, |
1113 | rqstp, p, obj); | |
1da177e4 LT |
1114 | break; |
1115 | } | |
1116 | out: | |
1117 | gss_put_ctx(ctx); | |
1118 | dprintk("RPC: %4u gss_wrap_req returning %d\n", task->tk_pid, status); | |
1119 | return status; | |
1120 | } | |
1121 | ||
1122 | static inline int | |
1123 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
1124 | struct rpc_rqst *rqstp, u32 **p) | |
1125 | { | |
1126 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1127 | struct xdr_buf integ_buf; | |
1128 | struct xdr_netobj mic; | |
1129 | u32 data_offset, mic_offset; | |
1130 | u32 integ_len; | |
1131 | u32 maj_stat; | |
1132 | int status = -EIO; | |
1133 | ||
1134 | integ_len = ntohl(*(*p)++); | |
1135 | if (integ_len & 3) | |
1136 | return status; | |
1137 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1138 | mic_offset = integ_len + data_offset; | |
1139 | if (mic_offset > rcv_buf->len) | |
1140 | return status; | |
1141 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1142 | return status; | |
1143 | ||
1144 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1145 | mic_offset - data_offset)) | |
1146 | return status; | |
1147 | ||
1148 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1149 | return status; | |
1150 | ||
00fd6e14 | 1151 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1152 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
1153 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
1154 | if (maj_stat != GSS_S_COMPLETE) | |
1155 | return status; | |
1156 | return 0; | |
1157 | } | |
1158 | ||
2d2da60c BF |
1159 | static inline int |
1160 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
1161 | struct rpc_rqst *rqstp, u32 **p) | |
1162 | { | |
1163 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1164 | u32 offset; | |
1165 | u32 opaque_len; | |
1166 | u32 maj_stat; | |
1167 | int status = -EIO; | |
1168 | ||
1169 | opaque_len = ntohl(*(*p)++); | |
1170 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1171 | if (offset + opaque_len > rcv_buf->len) | |
1172 | return status; | |
1173 | /* remove padding: */ | |
1174 | rcv_buf->len = offset + opaque_len; | |
1175 | ||
00fd6e14 | 1176 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c BF |
1177 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
1178 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
1179 | if (maj_stat != GSS_S_COMPLETE) | |
1180 | return status; | |
1181 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1182 | return status; | |
1183 | ||
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | ||
1da177e4 LT |
1188 | static int |
1189 | gss_unwrap_resp(struct rpc_task *task, | |
1190 | kxdrproc_t decode, void *rqstp, u32 *p, void *obj) | |
1191 | { | |
1192 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1193 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1194 | gc_base); | |
1195 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
24b2605b | 1196 | u32 *savedp = p; |
2d2da60c BF |
1197 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1198 | int savedlen = head->iov_len; | |
1da177e4 LT |
1199 | int status = -EIO; |
1200 | ||
1201 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1202 | goto out_decode; | |
1203 | switch (gss_cred->gc_service) { | |
1204 | case RPC_GSS_SVC_NONE: | |
1205 | break; | |
1206 | case RPC_GSS_SVC_INTEGRITY: | |
1207 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1208 | if (status) | |
1209 | goto out; | |
1210 | break; | |
1211 | case RPC_GSS_SVC_PRIVACY: | |
2d2da60c BF |
1212 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); |
1213 | if (status) | |
1214 | goto out; | |
1da177e4 LT |
1215 | break; |
1216 | } | |
24b2605b | 1217 | /* take into account extra slack for integrity and privacy cases: */ |
2d2da60c BF |
1218 | task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp) |
1219 | + (savedlen - head->iov_len); | |
1da177e4 LT |
1220 | out_decode: |
1221 | status = decode(rqstp, p, obj); | |
1222 | out: | |
1223 | gss_put_ctx(ctx); | |
1224 | dprintk("RPC: %4u gss_unwrap_resp returning %d\n", task->tk_pid, | |
1225 | status); | |
1226 | return status; | |
1227 | } | |
1228 | ||
1229 | static struct rpc_authops authgss_ops = { | |
1230 | .owner = THIS_MODULE, | |
1231 | .au_flavor = RPC_AUTH_GSS, | |
1232 | #ifdef RPC_DEBUG | |
1233 | .au_name = "RPCSEC_GSS", | |
1234 | #endif | |
1235 | .create = gss_create, | |
1236 | .destroy = gss_destroy, | |
1237 | .lookup_cred = gss_lookup_cred, | |
1238 | .crcreate = gss_create_cred | |
1239 | }; | |
1240 | ||
1241 | static struct rpc_credops gss_credops = { | |
1242 | .cr_name = "AUTH_GSS", | |
1243 | .crdestroy = gss_destroy_cred, | |
1244 | .crmatch = gss_match, | |
1245 | .crmarshal = gss_marshal, | |
1246 | .crrefresh = gss_refresh, | |
1247 | .crvalidate = gss_validate, | |
1248 | .crwrap_req = gss_wrap_req, | |
1249 | .crunwrap_resp = gss_unwrap_resp, | |
1250 | }; | |
1251 | ||
1252 | static struct rpc_pipe_ops gss_upcall_ops = { | |
1253 | .upcall = gss_pipe_upcall, | |
1254 | .downcall = gss_pipe_downcall, | |
1255 | .destroy_msg = gss_pipe_destroy_msg, | |
1256 | .release_pipe = gss_pipe_release, | |
1257 | }; | |
1258 | ||
1259 | /* | |
1260 | * Initialize RPCSEC_GSS module | |
1261 | */ | |
1262 | static int __init init_rpcsec_gss(void) | |
1263 | { | |
1264 | int err = 0; | |
1265 | ||
1266 | err = rpcauth_register(&authgss_ops); | |
1267 | if (err) | |
1268 | goto out; | |
1269 | err = gss_svc_init(); | |
1270 | if (err) | |
1271 | goto out_unregister; | |
1272 | return 0; | |
1273 | out_unregister: | |
1274 | rpcauth_unregister(&authgss_ops); | |
1275 | out: | |
1276 | return err; | |
1277 | } | |
1278 | ||
1279 | static void __exit exit_rpcsec_gss(void) | |
1280 | { | |
1281 | gss_svc_shutdown(); | |
1282 | rpcauth_unregister(&authgss_ops); | |
1283 | } | |
1284 | ||
1285 | MODULE_LICENSE("GPL"); | |
1286 | module_init(init_rpcsec_gss) | |
1287 | module_exit(exit_rpcsec_gss) |