Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/net/sunrpc/auth_gss/auth_gss.c |
1da177e4 LT |
3 | * |
4 | * RPCSEC_GSS client authentication. | |
cca5172a | 5 | * |
1da177e4 LT |
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): */ | |
adeb8133 | 71 | #define GSS_VERF_SLACK 100 |
1da177e4 LT |
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 | ||
cca5172a | 77 | #define CA_RUN_AS_MACHINE 0x00000200 |
1da177e4 LT |
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; | |
1da177e4 LT |
91 | }; |
92 | ||
93 | static void gss_destroy_ctx(struct gss_cl_ctx *); | |
94 | static struct rpc_pipe_ops gss_upcall_ops; | |
95 | ||
1da177e4 LT |
96 | static inline struct gss_cl_ctx * |
97 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
98 | { | |
99 | atomic_inc(&ctx->count); | |
100 | return ctx; | |
101 | } | |
102 | ||
103 | static inline void | |
104 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
105 | { | |
106 | if (atomic_dec_and_test(&ctx->count)) | |
107 | gss_destroy_ctx(ctx); | |
108 | } | |
109 | ||
110 | static void | |
111 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
112 | { | |
113 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
114 | struct gss_cl_ctx *old; | |
115 | write_lock(&gss_ctx_lock); | |
116 | old = gss_cred->gc_ctx; | |
117 | gss_cred->gc_ctx = ctx; | |
118 | cred->cr_flags |= RPCAUTH_CRED_UPTODATE; | |
8a317760 | 119 | cred->cr_flags &= ~RPCAUTH_CRED_NEW; |
1da177e4 LT |
120 | write_unlock(&gss_ctx_lock); |
121 | if (old) | |
122 | gss_put_ctx(old); | |
123 | } | |
124 | ||
125 | static int | |
126 | gss_cred_is_uptodate_ctx(struct rpc_cred *cred) | |
127 | { | |
128 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
129 | int res = 0; | |
130 | ||
131 | read_lock(&gss_ctx_lock); | |
132 | if ((cred->cr_flags & RPCAUTH_CRED_UPTODATE) && gss_cred->gc_ctx) | |
133 | res = 1; | |
134 | read_unlock(&gss_ctx_lock); | |
135 | return res; | |
136 | } | |
137 | ||
138 | static const void * | |
139 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
140 | { | |
141 | const void *q = (const void *)((const char *)p + len); | |
142 | if (unlikely(q > end || q < p)) | |
143 | return ERR_PTR(-EFAULT); | |
144 | memcpy(res, p, len); | |
145 | return q; | |
146 | } | |
147 | ||
148 | static inline const void * | |
149 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
150 | { | |
151 | const void *q; | |
152 | unsigned int len; | |
153 | ||
154 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
155 | if (IS_ERR(p)) | |
156 | return p; | |
157 | q = (const void *)((const char *)p + len); | |
158 | if (unlikely(q > end || q < p)) | |
159 | return ERR_PTR(-EFAULT); | |
e69062b4 | 160 | dest->data = kmemdup(p, len, GFP_KERNEL); |
1da177e4 LT |
161 | if (unlikely(dest->data == NULL)) |
162 | return ERR_PTR(-ENOMEM); | |
163 | dest->len = len; | |
1da177e4 LT |
164 | return q; |
165 | } | |
166 | ||
167 | static struct gss_cl_ctx * | |
168 | gss_cred_get_ctx(struct rpc_cred *cred) | |
169 | { | |
170 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
171 | struct gss_cl_ctx *ctx = NULL; | |
172 | ||
173 | read_lock(&gss_ctx_lock); | |
174 | if (gss_cred->gc_ctx) | |
175 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
176 | read_unlock(&gss_ctx_lock); | |
177 | return ctx; | |
178 | } | |
179 | ||
180 | static struct gss_cl_ctx * | |
181 | gss_alloc_context(void) | |
182 | { | |
183 | struct gss_cl_ctx *ctx; | |
184 | ||
0da974f4 | 185 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
1da177e4 | 186 | if (ctx != NULL) { |
1da177e4 LT |
187 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
188 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
189 | spin_lock_init(&ctx->gc_seq_lock); | |
190 | atomic_set(&ctx->count,1); | |
191 | } | |
192 | return ctx; | |
193 | } | |
194 | ||
195 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
196 | static const void * | |
197 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
198 | { | |
199 | const void *q; | |
200 | unsigned int seclen; | |
201 | unsigned int timeout; | |
202 | u32 window_size; | |
203 | int ret; | |
204 | ||
205 | /* First unsigned int gives the lifetime (in seconds) of the cred */ | |
206 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); | |
207 | if (IS_ERR(p)) | |
208 | goto err; | |
209 | if (timeout == 0) | |
210 | timeout = GSSD_MIN_TIMEOUT; | |
211 | ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; | |
212 | /* Sequence number window. Determines the maximum number of simultaneous requests */ | |
213 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); | |
214 | if (IS_ERR(p)) | |
215 | goto err; | |
216 | ctx->gc_win = window_size; | |
217 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
218 | if (ctx->gc_win == 0) { | |
219 | /* in which case, p points to an error code which we ignore */ | |
220 | p = ERR_PTR(-EACCES); | |
221 | goto err; | |
222 | } | |
223 | /* copy the opaque wire context */ | |
224 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
225 | if (IS_ERR(p)) | |
226 | goto err; | |
227 | /* import the opaque security context */ | |
228 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
229 | if (IS_ERR(p)) | |
230 | goto err; | |
231 | q = (const void *)((const char *)p + seclen); | |
232 | if (unlikely(q > end || q < p)) { | |
233 | p = ERR_PTR(-EFAULT); | |
234 | goto err; | |
235 | } | |
236 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); | |
237 | if (ret < 0) { | |
238 | p = ERR_PTR(ret); | |
239 | goto err; | |
240 | } | |
241 | return q; | |
242 | err: | |
8885cb36 | 243 | dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); |
1da177e4 LT |
244 | return p; |
245 | } | |
246 | ||
247 | ||
248 | struct gss_upcall_msg { | |
249 | atomic_t count; | |
250 | uid_t uid; | |
251 | struct rpc_pipe_msg msg; | |
252 | struct list_head list; | |
253 | struct gss_auth *auth; | |
254 | struct rpc_wait_queue rpc_waitqueue; | |
255 | wait_queue_head_t waitqueue; | |
256 | struct gss_cl_ctx *ctx; | |
257 | }; | |
258 | ||
259 | static void | |
260 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
261 | { | |
262 | if (!atomic_dec_and_test(&gss_msg->count)) | |
263 | return; | |
264 | BUG_ON(!list_empty(&gss_msg->list)); | |
265 | if (gss_msg->ctx != NULL) | |
266 | gss_put_ctx(gss_msg->ctx); | |
267 | kfree(gss_msg); | |
268 | } | |
269 | ||
270 | static struct gss_upcall_msg * | |
271 | __gss_find_upcall(struct gss_auth *gss_auth, uid_t uid) | |
272 | { | |
273 | struct gss_upcall_msg *pos; | |
274 | list_for_each_entry(pos, &gss_auth->upcalls, list) { | |
275 | if (pos->uid != uid) | |
276 | continue; | |
277 | atomic_inc(&pos->count); | |
8885cb36 | 278 | dprintk("RPC: gss_find_upcall found msg %p\n", pos); |
1da177e4 LT |
279 | return pos; |
280 | } | |
8885cb36 | 281 | dprintk("RPC: gss_find_upcall found nothing\n"); |
1da177e4 LT |
282 | return NULL; |
283 | } | |
284 | ||
285 | /* Try to add a upcall to the pipefs queue. | |
286 | * If an upcall owned by our uid already exists, then we return a reference | |
287 | * to that upcall instead of adding the new upcall. | |
288 | */ | |
289 | static inline struct gss_upcall_msg * | |
290 | gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) | |
291 | { | |
b185f835 | 292 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 LT |
293 | struct gss_upcall_msg *old; |
294 | ||
b185f835 | 295 | spin_lock(&inode->i_lock); |
1da177e4 LT |
296 | old = __gss_find_upcall(gss_auth, gss_msg->uid); |
297 | if (old == NULL) { | |
298 | atomic_inc(&gss_msg->count); | |
299 | list_add(&gss_msg->list, &gss_auth->upcalls); | |
300 | } else | |
301 | gss_msg = old; | |
b185f835 | 302 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
303 | return gss_msg; |
304 | } | |
305 | ||
306 | static void | |
307 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
308 | { | |
309 | if (list_empty(&gss_msg->list)) | |
310 | return; | |
311 | list_del_init(&gss_msg->list); | |
312 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
313 | wake_up_all(&gss_msg->waitqueue); | |
314 | atomic_dec(&gss_msg->count); | |
315 | } | |
316 | ||
317 | static void | |
318 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
319 | { | |
320 | struct gss_auth *gss_auth = gss_msg->auth; | |
b185f835 | 321 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 | 322 | |
b185f835 | 323 | spin_lock(&inode->i_lock); |
1da177e4 | 324 | __gss_unhash_msg(gss_msg); |
b185f835 | 325 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
326 | } |
327 | ||
328 | static void | |
329 | gss_upcall_callback(struct rpc_task *task) | |
330 | { | |
331 | struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, | |
332 | struct gss_cred, gc_base); | |
333 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
b185f835 | 334 | struct inode *inode = gss_msg->auth->dentry->d_inode; |
1da177e4 | 335 | |
1da177e4 LT |
336 | if (gss_msg->ctx) |
337 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); | |
338 | else | |
339 | task->tk_status = gss_msg->msg.errno; | |
b185f835 | 340 | spin_lock(&inode->i_lock); |
1da177e4 LT |
341 | gss_cred->gc_upcall = NULL; |
342 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
b185f835 | 343 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
344 | gss_release_msg(gss_msg); |
345 | } | |
346 | ||
347 | static inline struct gss_upcall_msg * | |
348 | gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) | |
349 | { | |
350 | struct gss_upcall_msg *gss_msg; | |
351 | ||
0da974f4 | 352 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL); |
1da177e4 | 353 | if (gss_msg != NULL) { |
1da177e4 LT |
354 | INIT_LIST_HEAD(&gss_msg->list); |
355 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
356 | init_waitqueue_head(&gss_msg->waitqueue); | |
357 | atomic_set(&gss_msg->count, 1); | |
358 | gss_msg->msg.data = &gss_msg->uid; | |
359 | gss_msg->msg.len = sizeof(gss_msg->uid); | |
360 | gss_msg->uid = uid; | |
361 | gss_msg->auth = gss_auth; | |
362 | } | |
363 | return gss_msg; | |
364 | } | |
365 | ||
366 | static struct gss_upcall_msg * | |
367 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
368 | { | |
369 | struct gss_upcall_msg *gss_new, *gss_msg; | |
370 | ||
371 | gss_new = gss_alloc_msg(gss_auth, cred->cr_uid); | |
372 | if (gss_new == NULL) | |
373 | return ERR_PTR(-ENOMEM); | |
374 | gss_msg = gss_add_msg(gss_auth, gss_new); | |
375 | if (gss_msg == gss_new) { | |
376 | int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); | |
377 | if (res) { | |
378 | gss_unhash_msg(gss_new); | |
379 | gss_msg = ERR_PTR(res); | |
380 | } | |
381 | } else | |
382 | gss_release_msg(gss_new); | |
383 | return gss_msg; | |
384 | } | |
385 | ||
386 | static inline int | |
387 | gss_refresh_upcall(struct rpc_task *task) | |
388 | { | |
389 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
4a8c1344 | 390 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
391 | struct gss_auth, rpc_auth); |
392 | struct gss_cred *gss_cred = container_of(cred, | |
393 | struct gss_cred, gc_base); | |
394 | struct gss_upcall_msg *gss_msg; | |
b185f835 | 395 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 LT |
396 | int err = 0; |
397 | ||
8885cb36 CL |
398 | dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, |
399 | cred->cr_uid); | |
1da177e4 LT |
400 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
401 | if (IS_ERR(gss_msg)) { | |
402 | err = PTR_ERR(gss_msg); | |
403 | goto out; | |
404 | } | |
b185f835 | 405 | spin_lock(&inode->i_lock); |
1da177e4 LT |
406 | if (gss_cred->gc_upcall != NULL) |
407 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL); | |
408 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { | |
409 | task->tk_timeout = 0; | |
410 | gss_cred->gc_upcall = gss_msg; | |
411 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
412 | atomic_inc(&gss_msg->count); | |
413 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL); | |
414 | } else | |
415 | err = gss_msg->msg.errno; | |
b185f835 | 416 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
417 | gss_release_msg(gss_msg); |
418 | out: | |
8885cb36 CL |
419 | dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", |
420 | task->tk_pid, cred->cr_uid, err); | |
1da177e4 LT |
421 | return err; |
422 | } | |
423 | ||
424 | static inline int | |
425 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
426 | { | |
b185f835 | 427 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 LT |
428 | struct rpc_cred *cred = &gss_cred->gc_base; |
429 | struct gss_upcall_msg *gss_msg; | |
430 | DEFINE_WAIT(wait); | |
431 | int err = 0; | |
432 | ||
8885cb36 | 433 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); |
1da177e4 LT |
434 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
435 | if (IS_ERR(gss_msg)) { | |
436 | err = PTR_ERR(gss_msg); | |
437 | goto out; | |
438 | } | |
439 | for (;;) { | |
440 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); | |
b185f835 | 441 | spin_lock(&inode->i_lock); |
1da177e4 | 442 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
b185f835 | 443 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
444 | break; |
445 | } | |
b185f835 | 446 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
447 | if (signalled()) { |
448 | err = -ERESTARTSYS; | |
449 | goto out_intr; | |
450 | } | |
451 | schedule(); | |
452 | } | |
453 | if (gss_msg->ctx) | |
454 | gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx)); | |
455 | else | |
456 | err = gss_msg->msg.errno; | |
457 | out_intr: | |
458 | finish_wait(&gss_msg->waitqueue, &wait); | |
459 | gss_release_msg(gss_msg); | |
460 | out: | |
8885cb36 CL |
461 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", |
462 | cred->cr_uid, err); | |
1da177e4 LT |
463 | return err; |
464 | } | |
465 | ||
466 | static ssize_t | |
467 | gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, | |
468 | char __user *dst, size_t buflen) | |
469 | { | |
470 | char *data = (char *)msg->data + msg->copied; | |
471 | ssize_t mlen = msg->len; | |
472 | ssize_t left; | |
473 | ||
474 | if (mlen > buflen) | |
475 | mlen = buflen; | |
476 | left = copy_to_user(dst, data, mlen); | |
477 | if (left < 0) { | |
478 | msg->errno = left; | |
479 | return left; | |
480 | } | |
481 | mlen -= left; | |
482 | msg->copied += mlen; | |
483 | msg->errno = 0; | |
484 | return mlen; | |
485 | } | |
486 | ||
487 | #define MSG_BUF_MAXSIZE 1024 | |
488 | ||
489 | static ssize_t | |
490 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
491 | { | |
492 | const void *p, *end; | |
493 | void *buf; | |
494 | struct rpc_clnt *clnt; | |
495 | struct gss_auth *gss_auth; | |
496 | struct rpc_cred *cred; | |
497 | struct gss_upcall_msg *gss_msg; | |
b185f835 | 498 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
499 | struct gss_cl_ctx *ctx; |
500 | uid_t uid; | |
501 | int err = -EFBIG; | |
502 | ||
503 | if (mlen > MSG_BUF_MAXSIZE) | |
504 | goto out; | |
505 | err = -ENOMEM; | |
506 | buf = kmalloc(mlen, GFP_KERNEL); | |
507 | if (!buf) | |
508 | goto out; | |
509 | ||
b185f835 | 510 | clnt = RPC_I(inode)->private; |
1da177e4 LT |
511 | err = -EFAULT; |
512 | if (copy_from_user(buf, src, mlen)) | |
513 | goto err; | |
514 | ||
515 | end = (const void *)((char *)buf + mlen); | |
516 | p = simple_get_bytes(buf, end, &uid, sizeof(uid)); | |
517 | if (IS_ERR(p)) { | |
518 | err = PTR_ERR(p); | |
519 | goto err; | |
520 | } | |
521 | ||
522 | err = -ENOMEM; | |
523 | ctx = gss_alloc_context(); | |
524 | if (ctx == NULL) | |
525 | goto err; | |
526 | err = 0; | |
527 | gss_auth = container_of(clnt->cl_auth, struct gss_auth, rpc_auth); | |
528 | p = gss_fill_context(p, end, ctx, gss_auth->mech); | |
529 | if (IS_ERR(p)) { | |
530 | err = PTR_ERR(p); | |
531 | if (err != -EACCES) | |
532 | goto err_put_ctx; | |
533 | } | |
b185f835 | 534 | spin_lock(&inode->i_lock); |
1da177e4 LT |
535 | gss_msg = __gss_find_upcall(gss_auth, uid); |
536 | if (gss_msg) { | |
537 | if (err == 0 && gss_msg->ctx == NULL) | |
538 | gss_msg->ctx = gss_get_ctx(ctx); | |
539 | gss_msg->msg.errno = err; | |
540 | __gss_unhash_msg(gss_msg); | |
b185f835 | 541 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
542 | gss_release_msg(gss_msg); |
543 | } else { | |
544 | struct auth_cred acred = { .uid = uid }; | |
b185f835 | 545 | spin_unlock(&inode->i_lock); |
8a317760 | 546 | cred = rpcauth_lookup_credcache(clnt->cl_auth, &acred, RPCAUTH_LOOKUP_NEW); |
1da177e4 LT |
547 | if (IS_ERR(cred)) { |
548 | err = PTR_ERR(cred); | |
549 | goto err_put_ctx; | |
550 | } | |
551 | gss_cred_set_ctx(cred, gss_get_ctx(ctx)); | |
552 | } | |
553 | gss_put_ctx(ctx); | |
554 | kfree(buf); | |
8885cb36 | 555 | dprintk("RPC: gss_pipe_downcall returning length %Zu\n", mlen); |
1da177e4 LT |
556 | return mlen; |
557 | err_put_ctx: | |
558 | gss_put_ctx(ctx); | |
559 | err: | |
560 | kfree(buf); | |
561 | out: | |
8885cb36 | 562 | dprintk("RPC: gss_pipe_downcall returning %d\n", err); |
1da177e4 LT |
563 | return err; |
564 | } | |
565 | ||
566 | static void | |
567 | gss_pipe_release(struct inode *inode) | |
568 | { | |
569 | struct rpc_inode *rpci = RPC_I(inode); | |
570 | struct rpc_clnt *clnt; | |
571 | struct rpc_auth *auth; | |
572 | struct gss_auth *gss_auth; | |
573 | ||
574 | clnt = rpci->private; | |
575 | auth = clnt->cl_auth; | |
576 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
b185f835 | 577 | spin_lock(&inode->i_lock); |
1da177e4 LT |
578 | while (!list_empty(&gss_auth->upcalls)) { |
579 | struct gss_upcall_msg *gss_msg; | |
580 | ||
581 | gss_msg = list_entry(gss_auth->upcalls.next, | |
582 | struct gss_upcall_msg, list); | |
583 | gss_msg->msg.errno = -EPIPE; | |
584 | atomic_inc(&gss_msg->count); | |
585 | __gss_unhash_msg(gss_msg); | |
b185f835 | 586 | spin_unlock(&inode->i_lock); |
1da177e4 | 587 | gss_release_msg(gss_msg); |
b185f835 | 588 | spin_lock(&inode->i_lock); |
1da177e4 | 589 | } |
b185f835 | 590 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
591 | } |
592 | ||
593 | static void | |
594 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
595 | { | |
596 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
597 | static unsigned long ratelimit; | |
598 | ||
599 | if (msg->errno < 0) { | |
8885cb36 | 600 | dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", |
1da177e4 LT |
601 | gss_msg); |
602 | atomic_inc(&gss_msg->count); | |
603 | gss_unhash_msg(gss_msg); | |
48e49187 | 604 | if (msg->errno == -ETIMEDOUT) { |
1da177e4 LT |
605 | unsigned long now = jiffies; |
606 | if (time_after(now, ratelimit)) { | |
607 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" | |
608 | "Please check user daemon is running!\n"); | |
609 | ratelimit = now + 15*HZ; | |
610 | } | |
611 | } | |
612 | gss_release_msg(gss_msg); | |
613 | } | |
614 | } | |
615 | ||
cca5172a YH |
616 | /* |
617 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
618 | * parameters based on the input flavor (which must be a pseudoflavor) |
619 | */ | |
620 | static struct rpc_auth * | |
621 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
622 | { | |
623 | struct gss_auth *gss_auth; | |
624 | struct rpc_auth * auth; | |
6a19275a | 625 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 626 | |
8885cb36 | 627 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
628 | |
629 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 630 | return ERR_PTR(err); |
1da177e4 LT |
631 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
632 | goto out_dec; | |
633 | gss_auth->client = clnt; | |
6a19275a | 634 | err = -EINVAL; |
1da177e4 LT |
635 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
636 | if (!gss_auth->mech) { | |
637 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!", | |
638 | __FUNCTION__, flavor); | |
639 | goto err_free; | |
640 | } | |
641 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
642 | if (gss_auth->service == 0) |
643 | goto err_put_mech; | |
1da177e4 | 644 | INIT_LIST_HEAD(&gss_auth->upcalls); |
1da177e4 LT |
645 | auth = &gss_auth->rpc_auth; |
646 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
647 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
648 | auth->au_ops = &authgss_ops; | |
649 | auth->au_flavor = flavor; | |
650 | atomic_set(&auth->au_count, 1); | |
651 | ||
6a19275a BF |
652 | err = rpcauth_init_credcache(auth, GSS_CRED_EXPIRE); |
653 | if (err) | |
1da177e4 LT |
654 | goto err_put_mech; |
655 | ||
158998b6 TM |
656 | gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, |
657 | clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
6a19275a BF |
658 | if (IS_ERR(gss_auth->dentry)) { |
659 | err = PTR_ERR(gss_auth->dentry); | |
1da177e4 | 660 | goto err_put_mech; |
6a19275a | 661 | } |
1da177e4 LT |
662 | |
663 | return auth; | |
664 | err_put_mech: | |
665 | gss_mech_put(gss_auth->mech); | |
666 | err_free: | |
667 | kfree(gss_auth); | |
668 | out_dec: | |
669 | module_put(THIS_MODULE); | |
6a19275a | 670 | return ERR_PTR(err); |
1da177e4 LT |
671 | } |
672 | ||
673 | static void | |
674 | gss_destroy(struct rpc_auth *auth) | |
675 | { | |
676 | struct gss_auth *gss_auth; | |
677 | ||
8885cb36 CL |
678 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
679 | auth, auth->au_flavor); | |
1da177e4 LT |
680 | |
681 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
5d67476f | 682 | rpc_unlink(gss_auth->dentry); |
12de3b35 | 683 | gss_auth->dentry = NULL; |
1da177e4 LT |
684 | gss_mech_put(gss_auth->mech); |
685 | ||
686 | rpcauth_free_credcache(auth); | |
687 | kfree(gss_auth); | |
688 | module_put(THIS_MODULE); | |
689 | } | |
690 | ||
691 | /* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure | |
692 | * to create a new cred or context, so they check that things have been | |
693 | * allocated before freeing them. */ | |
694 | static void | |
695 | gss_destroy_ctx(struct gss_cl_ctx *ctx) | |
696 | { | |
8885cb36 | 697 | dprintk("RPC: gss_destroy_ctx\n"); |
1da177e4 LT |
698 | |
699 | if (ctx->gc_gss_ctx) | |
700 | gss_delete_sec_context(&ctx->gc_gss_ctx); | |
701 | ||
702 | kfree(ctx->gc_wire_ctx.data); | |
703 | kfree(ctx); | |
704 | } | |
705 | ||
706 | static void | |
707 | gss_destroy_cred(struct rpc_cred *rc) | |
708 | { | |
709 | struct gss_cred *cred = container_of(rc, struct gss_cred, gc_base); | |
710 | ||
8885cb36 | 711 | dprintk("RPC: gss_destroy_cred \n"); |
1da177e4 LT |
712 | |
713 | if (cred->gc_ctx) | |
714 | gss_put_ctx(cred->gc_ctx); | |
715 | kfree(cred); | |
716 | } | |
717 | ||
718 | /* | |
719 | * Lookup RPCSEC_GSS cred for the current process | |
720 | */ | |
721 | static struct rpc_cred * | |
8a317760 | 722 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 723 | { |
8a317760 | 724 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
725 | } |
726 | ||
727 | static struct rpc_cred * | |
8a317760 | 728 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
729 | { |
730 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
731 | struct gss_cred *cred = NULL; | |
732 | int err = -ENOMEM; | |
733 | ||
8885cb36 | 734 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", |
1da177e4 LT |
735 | acred->uid, auth->au_flavor); |
736 | ||
0da974f4 | 737 | if (!(cred = kzalloc(sizeof(*cred), GFP_KERNEL))) |
1da177e4 LT |
738 | goto out_err; |
739 | ||
1da177e4 LT |
740 | atomic_set(&cred->gc_count, 1); |
741 | cred->gc_uid = acred->uid; | |
742 | /* | |
743 | * Note: in order to force a call to call_refresh(), we deliberately | |
744 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
745 | */ | |
746 | cred->gc_flags = 0; | |
4a8c1344 | 747 | cred->gc_base.cr_auth = auth; |
1da177e4 | 748 | cred->gc_base.cr_ops = &gss_credops; |
8a317760 | 749 | cred->gc_base.cr_flags = RPCAUTH_CRED_NEW; |
1da177e4 | 750 | cred->gc_service = gss_auth->service; |
1da177e4 LT |
751 | return &cred->gc_base; |
752 | ||
753 | out_err: | |
8885cb36 | 754 | dprintk("RPC: gss_create_cred failed with error %d\n", err); |
1da177e4 LT |
755 | return ERR_PTR(err); |
756 | } | |
757 | ||
fba3bad4 TM |
758 | static int |
759 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
760 | { | |
761 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
762 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
763 | int err; | |
764 | ||
765 | do { | |
766 | err = gss_create_upcall(gss_auth, gss_cred); | |
767 | } while (err == -EAGAIN); | |
768 | return err; | |
769 | } | |
770 | ||
1da177e4 | 771 | static int |
8a317760 | 772 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
773 | { |
774 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
775 | ||
8a317760 TM |
776 | /* |
777 | * If the searchflags have set RPCAUTH_LOOKUP_NEW, then | |
778 | * we don't really care if the credential has expired or not, | |
779 | * since the caller should be prepared to reinitialise it. | |
780 | */ | |
781 | if ((flags & RPCAUTH_LOOKUP_NEW) && (rc->cr_flags & RPCAUTH_CRED_NEW)) | |
782 | goto out; | |
1da177e4 LT |
783 | /* Don't match with creds that have expired. */ |
784 | if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) | |
785 | return 0; | |
8a317760 | 786 | out: |
1da177e4 LT |
787 | return (rc->cr_uid == acred->uid); |
788 | } | |
789 | ||
790 | /* | |
791 | * Marshal credentials. | |
792 | * Maybe we should keep a cached credential for performance reasons. | |
793 | */ | |
d8ed029d AD |
794 | static __be32 * |
795 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
796 | { |
797 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
798 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
799 | gc_base); | |
800 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 801 | __be32 *cred_len; |
1da177e4 LT |
802 | struct rpc_rqst *req = task->tk_rqstp; |
803 | u32 maj_stat = 0; | |
804 | struct xdr_netobj mic; | |
805 | struct kvec iov; | |
806 | struct xdr_buf verf_buf; | |
807 | ||
8885cb36 | 808 | dprintk("RPC: %5u gss_marshal\n", task->tk_pid); |
1da177e4 LT |
809 | |
810 | *p++ = htonl(RPC_AUTH_GSS); | |
811 | cred_len = p++; | |
812 | ||
813 | spin_lock(&ctx->gc_seq_lock); | |
814 | req->rq_seqno = ctx->gc_seq++; | |
815 | spin_unlock(&ctx->gc_seq_lock); | |
816 | ||
817 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
818 | *p++ = htonl((u32) ctx->gc_proc); | |
819 | *p++ = htonl((u32) req->rq_seqno); | |
820 | *p++ = htonl((u32) gss_cred->gc_service); | |
821 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
822 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
823 | ||
824 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
825 | * starting with the xid and ending at the end of the credential: */ | |
808012fb CL |
826 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
827 | req->rq_snd_buf.head[0].iov_base); | |
1da177e4 LT |
828 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
829 | xdr_buf_from_iov(&iov, &verf_buf); | |
830 | ||
831 | /* set verifier flavor*/ | |
832 | *p++ = htonl(RPC_AUTH_GSS); | |
833 | ||
834 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 835 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 LT |
836 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
837 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
838 | } else if (maj_stat != 0) { | |
839 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
840 | goto out_put_ctx; | |
841 | } | |
842 | p = xdr_encode_opaque(p, NULL, mic.len); | |
843 | gss_put_ctx(ctx); | |
844 | return p; | |
845 | out_put_ctx: | |
846 | gss_put_ctx(ctx); | |
847 | return NULL; | |
848 | } | |
849 | ||
850 | /* | |
851 | * Refresh credentials. XXX - finish | |
852 | */ | |
853 | static int | |
854 | gss_refresh(struct rpc_task *task) | |
855 | { | |
856 | ||
857 | if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) | |
858 | return gss_refresh_upcall(task); | |
859 | return 0; | |
860 | } | |
861 | ||
d8ed029d AD |
862 | static __be32 * |
863 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
864 | { |
865 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1da177e4 | 866 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 867 | __be32 seq; |
1da177e4 LT |
868 | struct kvec iov; |
869 | struct xdr_buf verf_buf; | |
870 | struct xdr_netobj mic; | |
871 | u32 flav,len; | |
872 | u32 maj_stat; | |
873 | ||
8885cb36 | 874 | dprintk("RPC: %5u gss_validate\n", task->tk_pid); |
1da177e4 LT |
875 | |
876 | flav = ntohl(*p++); | |
877 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 878 | goto out_bad; |
1da177e4 LT |
879 | if (flav != RPC_AUTH_GSS) |
880 | goto out_bad; | |
881 | seq = htonl(task->tk_rqstp->rq_seqno); | |
882 | iov.iov_base = &seq; | |
883 | iov.iov_len = sizeof(seq); | |
884 | xdr_buf_from_iov(&iov, &verf_buf); | |
885 | mic.data = (u8 *)p; | |
886 | mic.len = len; | |
887 | ||
00fd6e14 | 888 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 LT |
889 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
890 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
891 | if (maj_stat) | |
892 | goto out_bad; | |
24b2605b BF |
893 | /* We leave it to unwrap to calculate au_rslack. For now we just |
894 | * calculate the length of the verifier: */ | |
895 | task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2; | |
1da177e4 | 896 | gss_put_ctx(ctx); |
8885cb36 | 897 | dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", |
1da177e4 LT |
898 | task->tk_pid); |
899 | return p + XDR_QUADLEN(len); | |
900 | out_bad: | |
901 | gss_put_ctx(ctx); | |
8885cb36 | 902 | dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); |
1da177e4 LT |
903 | return NULL; |
904 | } | |
905 | ||
906 | static inline int | |
907 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 908 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
909 | { |
910 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
911 | struct xdr_buf integ_buf; | |
d8ed029d | 912 | __be32 *integ_len = NULL; |
1da177e4 | 913 | struct xdr_netobj mic; |
d8ed029d AD |
914 | u32 offset; |
915 | __be32 *q; | |
1da177e4 LT |
916 | struct kvec *iov; |
917 | u32 maj_stat = 0; | |
918 | int status = -EIO; | |
919 | ||
920 | integ_len = p++; | |
921 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
922 | *p++ = htonl(rqstp->rq_seqno); | |
923 | ||
924 | status = encode(rqstp, p, obj); | |
925 | if (status) | |
926 | return status; | |
927 | ||
928 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
929 | offset, snd_buf->len - offset)) | |
930 | return status; | |
931 | *integ_len = htonl(integ_buf.len); | |
932 | ||
933 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 934 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
935 | iov = snd_buf->tail; |
936 | else | |
937 | iov = snd_buf->head; | |
938 | p = iov->iov_base + iov->iov_len; | |
939 | mic.data = (u8 *)(p + 1); | |
940 | ||
00fd6e14 | 941 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
942 | status = -EIO; /* XXX? */ |
943 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
944 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
945 | else if (maj_stat) | |
946 | return status; | |
947 | q = xdr_encode_opaque(p, NULL, mic.len); | |
948 | ||
949 | offset = (u8 *)q - (u8 *)p; | |
950 | iov->iov_len += offset; | |
951 | snd_buf->len += offset; | |
952 | return 0; | |
953 | } | |
954 | ||
2d2da60c BF |
955 | static void |
956 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
957 | { | |
958 | int i; | |
959 | ||
960 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
961 | __free_page(rqstp->rq_enc_pages[i]); | |
962 | kfree(rqstp->rq_enc_pages); | |
963 | } | |
964 | ||
965 | static int | |
966 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
967 | { | |
968 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
969 | int first, last, i; | |
970 | ||
971 | if (snd_buf->page_len == 0) { | |
972 | rqstp->rq_enc_pages_num = 0; | |
973 | return 0; | |
974 | } | |
975 | ||
976 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
977 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
978 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
979 | rqstp->rq_enc_pages | |
980 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
981 | GFP_NOFS); | |
982 | if (!rqstp->rq_enc_pages) | |
983 | goto out; | |
984 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
985 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
986 | if (rqstp->rq_enc_pages[i] == NULL) | |
987 | goto out_free; | |
988 | } | |
989 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
990 | return 0; | |
991 | out_free: | |
992 | for (i--; i >= 0; i--) { | |
993 | __free_page(rqstp->rq_enc_pages[i]); | |
994 | } | |
995 | out: | |
996 | return -EAGAIN; | |
997 | } | |
998 | ||
999 | static inline int | |
1000 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1001 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
2d2da60c BF |
1002 | { |
1003 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1004 | u32 offset; | |
1005 | u32 maj_stat; | |
1006 | int status; | |
d8ed029d | 1007 | __be32 *opaque_len; |
2d2da60c BF |
1008 | struct page **inpages; |
1009 | int first; | |
1010 | int pad; | |
1011 | struct kvec *iov; | |
1012 | char *tmp; | |
1013 | ||
1014 | opaque_len = p++; | |
1015 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1016 | *p++ = htonl(rqstp->rq_seqno); | |
1017 | ||
1018 | status = encode(rqstp, p, obj); | |
1019 | if (status) | |
1020 | return status; | |
1021 | ||
1022 | status = alloc_enc_pages(rqstp); | |
1023 | if (status) | |
1024 | return status; | |
1025 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1026 | inpages = snd_buf->pages + first; | |
1027 | snd_buf->pages = rqstp->rq_enc_pages; | |
1028 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
1029 | /* Give the tail its own page, in case we need extra space in the | |
1030 | * head when wrapping: */ | |
1031 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { | |
1032 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1033 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1034 | snd_buf->tail[0].iov_base = tmp; | |
1035 | } | |
00fd6e14 | 1036 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
2d2da60c BF |
1037 | /* RPC_SLACK_SPACE should prevent this ever happening: */ |
1038 | BUG_ON(snd_buf->len > snd_buf->buflen); | |
cca5172a | 1039 | status = -EIO; |
2d2da60c BF |
1040 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1041 | * done anyway, so it's safe to put the request on the wire: */ | |
1042 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
1043 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
1044 | else if (maj_stat) | |
1045 | return status; | |
1046 | ||
1047 | *opaque_len = htonl(snd_buf->len - offset); | |
1048 | /* guess whether we're in the head or the tail: */ | |
1049 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1050 | iov = snd_buf->tail; | |
1051 | else | |
1052 | iov = snd_buf->head; | |
1053 | p = iov->iov_base + iov->iov_len; | |
1054 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1055 | memset(p, 0, pad); | |
1056 | iov->iov_len += pad; | |
1057 | snd_buf->len += pad; | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | ||
1da177e4 LT |
1062 | static int |
1063 | gss_wrap_req(struct rpc_task *task, | |
d8ed029d | 1064 | kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1065 | { |
1066 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1067 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1068 | gc_base); | |
1069 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1070 | int status = -EIO; | |
1071 | ||
8885cb36 | 1072 | dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); |
1da177e4 LT |
1073 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1074 | /* The spec seems a little ambiguous here, but I think that not | |
1075 | * wrapping context destruction requests makes the most sense. | |
1076 | */ | |
1077 | status = encode(rqstp, p, obj); | |
1078 | goto out; | |
1079 | } | |
1080 | switch (gss_cred->gc_service) { | |
1081 | case RPC_GSS_SVC_NONE: | |
1082 | status = encode(rqstp, p, obj); | |
1083 | break; | |
1084 | case RPC_GSS_SVC_INTEGRITY: | |
1085 | status = gss_wrap_req_integ(cred, ctx, encode, | |
1086 | rqstp, p, obj); | |
1087 | break; | |
cca5172a | 1088 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1089 | status = gss_wrap_req_priv(cred, ctx, encode, |
1090 | rqstp, p, obj); | |
1da177e4 LT |
1091 | break; |
1092 | } | |
1093 | out: | |
1094 | gss_put_ctx(ctx); | |
8885cb36 | 1095 | dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); |
1da177e4 LT |
1096 | return status; |
1097 | } | |
1098 | ||
1099 | static inline int | |
1100 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1101 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1102 | { |
1103 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1104 | struct xdr_buf integ_buf; | |
1105 | struct xdr_netobj mic; | |
1106 | u32 data_offset, mic_offset; | |
1107 | u32 integ_len; | |
1108 | u32 maj_stat; | |
1109 | int status = -EIO; | |
1110 | ||
1111 | integ_len = ntohl(*(*p)++); | |
1112 | if (integ_len & 3) | |
1113 | return status; | |
1114 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1115 | mic_offset = integ_len + data_offset; | |
1116 | if (mic_offset > rcv_buf->len) | |
1117 | return status; | |
1118 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1119 | return status; | |
1120 | ||
1121 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1122 | mic_offset - data_offset)) | |
1123 | return status; | |
1124 | ||
1125 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1126 | return status; | |
1127 | ||
00fd6e14 | 1128 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1129 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
1130 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
1131 | if (maj_stat != GSS_S_COMPLETE) | |
1132 | return status; | |
1133 | return 0; | |
1134 | } | |
1135 | ||
2d2da60c BF |
1136 | static inline int |
1137 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1138 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1139 | { |
1140 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1141 | u32 offset; | |
1142 | u32 opaque_len; | |
1143 | u32 maj_stat; | |
1144 | int status = -EIO; | |
1145 | ||
1146 | opaque_len = ntohl(*(*p)++); | |
1147 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1148 | if (offset + opaque_len > rcv_buf->len) | |
1149 | return status; | |
1150 | /* remove padding: */ | |
1151 | rcv_buf->len = offset + opaque_len; | |
1152 | ||
00fd6e14 | 1153 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c BF |
1154 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
1155 | cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; | |
1156 | if (maj_stat != GSS_S_COMPLETE) | |
1157 | return status; | |
1158 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1159 | return status; | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | ||
1da177e4 LT |
1165 | static int |
1166 | gss_unwrap_resp(struct rpc_task *task, | |
d8ed029d | 1167 | kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1168 | { |
1169 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1170 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1171 | gc_base); | |
1172 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1173 | __be32 *savedp = p; |
2d2da60c BF |
1174 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1175 | int savedlen = head->iov_len; | |
1da177e4 LT |
1176 | int status = -EIO; |
1177 | ||
1178 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1179 | goto out_decode; | |
1180 | switch (gss_cred->gc_service) { | |
1181 | case RPC_GSS_SVC_NONE: | |
1182 | break; | |
1183 | case RPC_GSS_SVC_INTEGRITY: | |
1184 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1185 | if (status) | |
1186 | goto out; | |
1187 | break; | |
cca5172a | 1188 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1189 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); |
1190 | if (status) | |
1191 | goto out; | |
1da177e4 LT |
1192 | break; |
1193 | } | |
24b2605b | 1194 | /* take into account extra slack for integrity and privacy cases: */ |
2d2da60c BF |
1195 | task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp) |
1196 | + (savedlen - head->iov_len); | |
1da177e4 LT |
1197 | out_decode: |
1198 | status = decode(rqstp, p, obj); | |
1199 | out: | |
1200 | gss_put_ctx(ctx); | |
8885cb36 | 1201 | dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, |
1da177e4 LT |
1202 | status); |
1203 | return status; | |
1204 | } | |
cca5172a | 1205 | |
1da177e4 LT |
1206 | static struct rpc_authops authgss_ops = { |
1207 | .owner = THIS_MODULE, | |
1208 | .au_flavor = RPC_AUTH_GSS, | |
1209 | #ifdef RPC_DEBUG | |
1210 | .au_name = "RPCSEC_GSS", | |
1211 | #endif | |
1212 | .create = gss_create, | |
1213 | .destroy = gss_destroy, | |
1214 | .lookup_cred = gss_lookup_cred, | |
1215 | .crcreate = gss_create_cred | |
1216 | }; | |
1217 | ||
1218 | static struct rpc_credops gss_credops = { | |
1219 | .cr_name = "AUTH_GSS", | |
1220 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1221 | .cr_init = gss_cred_init, |
1da177e4 LT |
1222 | .crmatch = gss_match, |
1223 | .crmarshal = gss_marshal, | |
1224 | .crrefresh = gss_refresh, | |
1225 | .crvalidate = gss_validate, | |
1226 | .crwrap_req = gss_wrap_req, | |
1227 | .crunwrap_resp = gss_unwrap_resp, | |
1228 | }; | |
1229 | ||
1230 | static struct rpc_pipe_ops gss_upcall_ops = { | |
1231 | .upcall = gss_pipe_upcall, | |
1232 | .downcall = gss_pipe_downcall, | |
1233 | .destroy_msg = gss_pipe_destroy_msg, | |
1234 | .release_pipe = gss_pipe_release, | |
1235 | }; | |
1236 | ||
1237 | /* | |
1238 | * Initialize RPCSEC_GSS module | |
1239 | */ | |
1240 | static int __init init_rpcsec_gss(void) | |
1241 | { | |
1242 | int err = 0; | |
1243 | ||
1244 | err = rpcauth_register(&authgss_ops); | |
1245 | if (err) | |
1246 | goto out; | |
1247 | err = gss_svc_init(); | |
1248 | if (err) | |
1249 | goto out_unregister; | |
1250 | return 0; | |
1251 | out_unregister: | |
1252 | rpcauth_unregister(&authgss_ops); | |
1253 | out: | |
1254 | return err; | |
1255 | } | |
1256 | ||
1257 | static void __exit exit_rpcsec_gss(void) | |
1258 | { | |
1259 | gss_svc_shutdown(); | |
1260 | rpcauth_unregister(&authgss_ops); | |
1261 | } | |
1262 | ||
1263 | MODULE_LICENSE("GPL"); | |
1264 | module_init(init_rpcsec_gss) | |
1265 | module_exit(exit_rpcsec_gss) |