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 | ||
f1c0a861 | 57 | static const struct rpc_authops authgss_ops; |
1da177e4 | 58 | |
f1c0a861 | 59 | static const struct rpc_credops gss_credops; |
1da177e4 LT |
60 | |
61 | #ifdef RPC_DEBUG | |
62 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
63 | #endif | |
64 | ||
65 | #define NFS_NGROUPS 16 | |
66 | ||
1da177e4 LT |
67 | #define GSS_CRED_SLACK 1024 /* XXX: unused */ |
68 | /* length of a krb5 verifier (48), plus data added before arguments when | |
69 | * using integrity (two 4-byte integers): */ | |
adeb8133 | 70 | #define GSS_VERF_SLACK 100 |
1da177e4 LT |
71 | |
72 | /* XXX this define must match the gssd define | |
73 | * as it is passed to gssd to signal the use of | |
74 | * machine creds should be part of the shared rpc interface */ | |
75 | ||
cca5172a | 76 | #define CA_RUN_AS_MACHINE 0x00000200 |
1da177e4 LT |
77 | |
78 | /* dump the buffer in `emacs-hexl' style */ | |
79 | #define isprint(c) ((c > 0x1f) && (c < 0x7f)) | |
80 | ||
1da177e4 LT |
81 | struct gss_auth { |
82 | struct rpc_auth rpc_auth; | |
83 | struct gss_api_mech *mech; | |
84 | enum rpc_gss_svc service; | |
1da177e4 LT |
85 | struct rpc_clnt *client; |
86 | struct dentry *dentry; | |
1da177e4 LT |
87 | }; |
88 | ||
5d28dc82 | 89 | static void gss_free_ctx(struct gss_cl_ctx *); |
1da177e4 LT |
90 | static struct rpc_pipe_ops gss_upcall_ops; |
91 | ||
1da177e4 LT |
92 | static inline struct gss_cl_ctx * |
93 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
94 | { | |
95 | atomic_inc(&ctx->count); | |
96 | return ctx; | |
97 | } | |
98 | ||
99 | static inline void | |
100 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
101 | { | |
102 | if (atomic_dec_and_test(&ctx->count)) | |
5d28dc82 | 103 | gss_free_ctx(ctx); |
1da177e4 LT |
104 | } |
105 | ||
5d28dc82 TM |
106 | /* gss_cred_set_ctx: |
107 | * called by gss_upcall_callback and gss_create_upcall in order | |
108 | * to set the gss context. The actual exchange of an old context | |
109 | * and a new one is protected by the inode->i_lock. | |
110 | */ | |
1da177e4 LT |
111 | static void |
112 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
113 | { | |
114 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
115 | struct gss_cl_ctx *old; | |
5d28dc82 | 116 | |
1da177e4 | 117 | old = gss_cred->gc_ctx; |
5d28dc82 | 118 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 TM |
119 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
120 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); | |
1da177e4 LT |
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 | ||
5d28dc82 | 131 | rcu_read_lock(); |
fc432dd9 | 132 | if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) && gss_cred->gc_ctx) |
1da177e4 | 133 | res = 1; |
5d28dc82 | 134 | rcu_read_unlock(); |
1da177e4 LT |
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 | ||
5d28dc82 | 173 | rcu_read_lock(); |
1da177e4 LT |
174 | if (gss_cred->gc_ctx) |
175 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
5d28dc82 | 176 | rcu_read_unlock(); |
1da177e4 LT |
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 * | |
6e84c7b6 | 271 | __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) |
1da177e4 LT |
272 | { |
273 | struct gss_upcall_msg *pos; | |
6e84c7b6 | 274 | list_for_each_entry(pos, &rpci->in_downcall, list) { |
1da177e4 LT |
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; |
6e84c7b6 | 293 | struct rpc_inode *rpci = RPC_I(inode); |
1da177e4 LT |
294 | struct gss_upcall_msg *old; |
295 | ||
b185f835 | 296 | spin_lock(&inode->i_lock); |
6e84c7b6 | 297 | old = __gss_find_upcall(rpci, gss_msg->uid); |
1da177e4 LT |
298 | if (old == NULL) { |
299 | atomic_inc(&gss_msg->count); | |
6e84c7b6 | 300 | list_add(&gss_msg->list, &rpci->in_downcall); |
1da177e4 LT |
301 | } else |
302 | gss_msg = old; | |
b185f835 | 303 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
304 | return gss_msg; |
305 | } | |
306 | ||
307 | static void | |
308 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
309 | { | |
1da177e4 LT |
310 | list_del_init(&gss_msg->list); |
311 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
312 | wake_up_all(&gss_msg->waitqueue); | |
313 | atomic_dec(&gss_msg->count); | |
314 | } | |
315 | ||
316 | static void | |
317 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
318 | { | |
319 | struct gss_auth *gss_auth = gss_msg->auth; | |
b185f835 | 320 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 | 321 | |
3b68aaea TM |
322 | if (list_empty(&gss_msg->list)) |
323 | return; | |
b185f835 | 324 | spin_lock(&inode->i_lock); |
3b68aaea TM |
325 | if (!list_empty(&gss_msg->list)) |
326 | __gss_unhash_msg(gss_msg); | |
b185f835 | 327 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
328 | } |
329 | ||
330 | static void | |
331 | gss_upcall_callback(struct rpc_task *task) | |
332 | { | |
333 | struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, | |
334 | struct gss_cred, gc_base); | |
335 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
b185f835 | 336 | struct inode *inode = gss_msg->auth->dentry->d_inode; |
1da177e4 | 337 | |
5d28dc82 | 338 | spin_lock(&inode->i_lock); |
1da177e4 LT |
339 | if (gss_msg->ctx) |
340 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); | |
341 | else | |
342 | task->tk_status = gss_msg->msg.errno; | |
1da177e4 LT |
343 | gss_cred->gc_upcall = NULL; |
344 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
b185f835 | 345 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
346 | gss_release_msg(gss_msg); |
347 | } | |
348 | ||
349 | static inline struct gss_upcall_msg * | |
350 | gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) | |
351 | { | |
352 | struct gss_upcall_msg *gss_msg; | |
353 | ||
0da974f4 | 354 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL); |
1da177e4 | 355 | if (gss_msg != NULL) { |
1da177e4 LT |
356 | INIT_LIST_HEAD(&gss_msg->list); |
357 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
358 | init_waitqueue_head(&gss_msg->waitqueue); | |
359 | atomic_set(&gss_msg->count, 1); | |
360 | gss_msg->msg.data = &gss_msg->uid; | |
361 | gss_msg->msg.len = sizeof(gss_msg->uid); | |
362 | gss_msg->uid = uid; | |
363 | gss_msg->auth = gss_auth; | |
364 | } | |
365 | return gss_msg; | |
366 | } | |
367 | ||
368 | static struct gss_upcall_msg * | |
369 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
370 | { | |
371 | struct gss_upcall_msg *gss_new, *gss_msg; | |
372 | ||
373 | gss_new = gss_alloc_msg(gss_auth, cred->cr_uid); | |
374 | if (gss_new == NULL) | |
375 | return ERR_PTR(-ENOMEM); | |
376 | gss_msg = gss_add_msg(gss_auth, gss_new); | |
377 | if (gss_msg == gss_new) { | |
378 | int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); | |
379 | if (res) { | |
380 | gss_unhash_msg(gss_new); | |
381 | gss_msg = ERR_PTR(res); | |
382 | } | |
383 | } else | |
384 | gss_release_msg(gss_new); | |
385 | return gss_msg; | |
386 | } | |
387 | ||
388 | static inline int | |
389 | gss_refresh_upcall(struct rpc_task *task) | |
390 | { | |
391 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
4a8c1344 | 392 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
393 | struct gss_auth, rpc_auth); |
394 | struct gss_cred *gss_cred = container_of(cred, | |
395 | struct gss_cred, gc_base); | |
396 | struct gss_upcall_msg *gss_msg; | |
b185f835 | 397 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 LT |
398 | int err = 0; |
399 | ||
8885cb36 CL |
400 | dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, |
401 | cred->cr_uid); | |
1da177e4 LT |
402 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
403 | if (IS_ERR(gss_msg)) { | |
404 | err = PTR_ERR(gss_msg); | |
405 | goto out; | |
406 | } | |
b185f835 | 407 | spin_lock(&inode->i_lock); |
1da177e4 LT |
408 | if (gss_cred->gc_upcall != NULL) |
409 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL); | |
410 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { | |
411 | task->tk_timeout = 0; | |
412 | gss_cred->gc_upcall = gss_msg; | |
413 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
414 | atomic_inc(&gss_msg->count); | |
415 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL); | |
416 | } else | |
417 | err = gss_msg->msg.errno; | |
b185f835 | 418 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
419 | gss_release_msg(gss_msg); |
420 | out: | |
8885cb36 CL |
421 | dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", |
422 | task->tk_pid, cred->cr_uid, err); | |
1da177e4 LT |
423 | return err; |
424 | } | |
425 | ||
426 | static inline int | |
427 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
428 | { | |
b185f835 | 429 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 LT |
430 | struct rpc_cred *cred = &gss_cred->gc_base; |
431 | struct gss_upcall_msg *gss_msg; | |
432 | DEFINE_WAIT(wait); | |
433 | int err = 0; | |
434 | ||
8885cb36 | 435 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); |
1da177e4 LT |
436 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
437 | if (IS_ERR(gss_msg)) { | |
438 | err = PTR_ERR(gss_msg); | |
439 | goto out; | |
440 | } | |
441 | for (;;) { | |
442 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); | |
b185f835 | 443 | spin_lock(&inode->i_lock); |
1da177e4 | 444 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
445 | break; |
446 | } | |
b185f835 | 447 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
448 | if (signalled()) { |
449 | err = -ERESTARTSYS; | |
450 | goto out_intr; | |
451 | } | |
452 | schedule(); | |
453 | } | |
454 | if (gss_msg->ctx) | |
455 | gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx)); | |
456 | else | |
457 | err = gss_msg->msg.errno; | |
5d28dc82 | 458 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
459 | out_intr: |
460 | finish_wait(&gss_msg->waitqueue, &wait); | |
461 | gss_release_msg(gss_msg); | |
462 | out: | |
8885cb36 CL |
463 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", |
464 | cred->cr_uid, err); | |
1da177e4 LT |
465 | return err; |
466 | } | |
467 | ||
468 | static ssize_t | |
469 | gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, | |
470 | char __user *dst, size_t buflen) | |
471 | { | |
472 | char *data = (char *)msg->data + msg->copied; | |
473 | ssize_t mlen = msg->len; | |
474 | ssize_t left; | |
475 | ||
476 | if (mlen > buflen) | |
477 | mlen = buflen; | |
478 | left = copy_to_user(dst, data, mlen); | |
479 | if (left < 0) { | |
480 | msg->errno = left; | |
481 | return left; | |
482 | } | |
483 | mlen -= left; | |
484 | msg->copied += mlen; | |
485 | msg->errno = 0; | |
486 | return mlen; | |
487 | } | |
488 | ||
489 | #define MSG_BUF_MAXSIZE 1024 | |
490 | ||
491 | static ssize_t | |
492 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
493 | { | |
494 | const void *p, *end; | |
495 | void *buf; | |
496 | struct rpc_clnt *clnt; | |
1da177e4 | 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; | |
3b68aaea | 501 | ssize_t err = -EFBIG; |
1da177e4 LT |
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; | |
3b68aaea TM |
526 | |
527 | err = -ENOENT; | |
528 | /* Find a matching upcall */ | |
3b68aaea | 529 | spin_lock(&inode->i_lock); |
6e84c7b6 | 530 | gss_msg = __gss_find_upcall(RPC_I(inode), uid); |
3b68aaea TM |
531 | if (gss_msg == NULL) { |
532 | spin_unlock(&inode->i_lock); | |
533 | goto err_put_ctx; | |
534 | } | |
535 | list_del_init(&gss_msg->list); | |
536 | spin_unlock(&inode->i_lock); | |
537 | ||
6e84c7b6 | 538 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
539 | if (IS_ERR(p)) { |
540 | err = PTR_ERR(p); | |
3b68aaea TM |
541 | gss_msg->msg.errno = (err == -EACCES) ? -EACCES : -EAGAIN; |
542 | goto err_release_msg; | |
1da177e4 | 543 | } |
3b68aaea TM |
544 | gss_msg->ctx = gss_get_ctx(ctx); |
545 | err = mlen; | |
546 | ||
547 | err_release_msg: | |
b185f835 | 548 | spin_lock(&inode->i_lock); |
3b68aaea TM |
549 | __gss_unhash_msg(gss_msg); |
550 | spin_unlock(&inode->i_lock); | |
551 | gss_release_msg(gss_msg); | |
1da177e4 LT |
552 | err_put_ctx: |
553 | gss_put_ctx(ctx); | |
554 | err: | |
555 | kfree(buf); | |
556 | out: | |
3b68aaea | 557 | dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); |
1da177e4 LT |
558 | return err; |
559 | } | |
560 | ||
561 | static void | |
562 | gss_pipe_release(struct inode *inode) | |
563 | { | |
564 | struct rpc_inode *rpci = RPC_I(inode); | |
6e84c7b6 | 565 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 566 | |
b185f835 | 567 | spin_lock(&inode->i_lock); |
6e84c7b6 | 568 | while (!list_empty(&rpci->in_downcall)) { |
1da177e4 | 569 | |
6e84c7b6 | 570 | gss_msg = list_entry(rpci->in_downcall.next, |
1da177e4 LT |
571 | struct gss_upcall_msg, list); |
572 | gss_msg->msg.errno = -EPIPE; | |
573 | atomic_inc(&gss_msg->count); | |
574 | __gss_unhash_msg(gss_msg); | |
b185f835 | 575 | spin_unlock(&inode->i_lock); |
1da177e4 | 576 | gss_release_msg(gss_msg); |
b185f835 | 577 | spin_lock(&inode->i_lock); |
1da177e4 | 578 | } |
b185f835 | 579 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
580 | } |
581 | ||
582 | static void | |
583 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
584 | { | |
585 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
586 | static unsigned long ratelimit; | |
587 | ||
588 | if (msg->errno < 0) { | |
8885cb36 | 589 | dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", |
1da177e4 LT |
590 | gss_msg); |
591 | atomic_inc(&gss_msg->count); | |
592 | gss_unhash_msg(gss_msg); | |
48e49187 | 593 | if (msg->errno == -ETIMEDOUT) { |
1da177e4 LT |
594 | unsigned long now = jiffies; |
595 | if (time_after(now, ratelimit)) { | |
596 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" | |
597 | "Please check user daemon is running!\n"); | |
598 | ratelimit = now + 15*HZ; | |
599 | } | |
600 | } | |
601 | gss_release_msg(gss_msg); | |
602 | } | |
603 | } | |
604 | ||
cca5172a YH |
605 | /* |
606 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
607 | * parameters based on the input flavor (which must be a pseudoflavor) |
608 | */ | |
609 | static struct rpc_auth * | |
610 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
611 | { | |
612 | struct gss_auth *gss_auth; | |
613 | struct rpc_auth * auth; | |
6a19275a | 614 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 615 | |
8885cb36 | 616 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
617 | |
618 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 619 | return ERR_PTR(err); |
1da177e4 LT |
620 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
621 | goto out_dec; | |
622 | gss_auth->client = clnt; | |
6a19275a | 623 | err = -EINVAL; |
1da177e4 LT |
624 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
625 | if (!gss_auth->mech) { | |
626 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!", | |
627 | __FUNCTION__, flavor); | |
628 | goto err_free; | |
629 | } | |
630 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
631 | if (gss_auth->service == 0) |
632 | goto err_put_mech; | |
1da177e4 LT |
633 | auth = &gss_auth->rpc_auth; |
634 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
635 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
636 | auth->au_ops = &authgss_ops; | |
637 | auth->au_flavor = flavor; | |
638 | atomic_set(&auth->au_count, 1); | |
639 | ||
158998b6 TM |
640 | gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, |
641 | clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
6a19275a BF |
642 | if (IS_ERR(gss_auth->dentry)) { |
643 | err = PTR_ERR(gss_auth->dentry); | |
1da177e4 | 644 | goto err_put_mech; |
6a19275a | 645 | } |
1da177e4 | 646 | |
f5c2187c | 647 | err = rpcauth_init_credcache(auth); |
07a2bf1d TM |
648 | if (err) |
649 | goto err_unlink_pipe; | |
650 | ||
1da177e4 | 651 | return auth; |
07a2bf1d TM |
652 | err_unlink_pipe: |
653 | rpc_unlink(gss_auth->dentry); | |
1da177e4 LT |
654 | err_put_mech: |
655 | gss_mech_put(gss_auth->mech); | |
656 | err_free: | |
657 | kfree(gss_auth); | |
658 | out_dec: | |
659 | module_put(THIS_MODULE); | |
6a19275a | 660 | return ERR_PTR(err); |
1da177e4 LT |
661 | } |
662 | ||
663 | static void | |
664 | gss_destroy(struct rpc_auth *auth) | |
665 | { | |
666 | struct gss_auth *gss_auth; | |
667 | ||
8885cb36 CL |
668 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
669 | auth, auth->au_flavor); | |
1da177e4 | 670 | |
3ab9bb72 TM |
671 | rpcauth_destroy_credcache(auth); |
672 | ||
1da177e4 | 673 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
5d67476f | 674 | rpc_unlink(gss_auth->dentry); |
12de3b35 | 675 | gss_auth->dentry = NULL; |
1da177e4 LT |
676 | gss_mech_put(gss_auth->mech); |
677 | ||
1da177e4 LT |
678 | kfree(gss_auth); |
679 | module_put(THIS_MODULE); | |
680 | } | |
681 | ||
682 | /* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure | |
683 | * to create a new cred or context, so they check that things have been | |
684 | * allocated before freeing them. */ | |
685 | static void | |
5d28dc82 | 686 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 687 | { |
5d28dc82 | 688 | dprintk("RPC: gss_free_ctx\n"); |
1da177e4 LT |
689 | |
690 | if (ctx->gc_gss_ctx) | |
691 | gss_delete_sec_context(&ctx->gc_gss_ctx); | |
692 | ||
693 | kfree(ctx->gc_wire_ctx.data); | |
694 | kfree(ctx); | |
695 | } | |
696 | ||
5d28dc82 TM |
697 | static void |
698 | gss_free_ctx_callback(struct rcu_head *head) | |
699 | { | |
700 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
701 | gss_do_free_ctx(ctx); | |
702 | } | |
703 | ||
704 | static void | |
705 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
706 | { | |
707 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); | |
708 | } | |
709 | ||
1da177e4 | 710 | static void |
31be5bf1 | 711 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 712 | { |
31be5bf1 | 713 | dprintk("RPC: gss_free_cred %p\n", gss_cred); |
31be5bf1 TM |
714 | kfree(gss_cred); |
715 | } | |
1da177e4 | 716 | |
31be5bf1 TM |
717 | static void |
718 | gss_free_cred_callback(struct rcu_head *head) | |
719 | { | |
720 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
721 | gss_free_cred(gss_cred); | |
722 | } | |
1da177e4 | 723 | |
31be5bf1 TM |
724 | static void |
725 | gss_destroy_cred(struct rpc_cred *cred) | |
726 | { | |
5d28dc82 TM |
727 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
728 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; | |
729 | ||
730 | rcu_assign_pointer(gss_cred->gc_ctx, NULL); | |
31be5bf1 | 731 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
732 | if (ctx) |
733 | gss_put_ctx(ctx); | |
1da177e4 LT |
734 | } |
735 | ||
736 | /* | |
737 | * Lookup RPCSEC_GSS cred for the current process | |
738 | */ | |
739 | static struct rpc_cred * | |
8a317760 | 740 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 741 | { |
8a317760 | 742 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
743 | } |
744 | ||
745 | static struct rpc_cred * | |
8a317760 | 746 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
747 | { |
748 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
749 | struct gss_cred *cred = NULL; | |
750 | int err = -ENOMEM; | |
751 | ||
8885cb36 | 752 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", |
1da177e4 LT |
753 | acred->uid, auth->au_flavor); |
754 | ||
0da974f4 | 755 | if (!(cred = kzalloc(sizeof(*cred), GFP_KERNEL))) |
1da177e4 LT |
756 | goto out_err; |
757 | ||
5fe4755e | 758 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
759 | /* |
760 | * Note: in order to force a call to call_refresh(), we deliberately | |
761 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
762 | */ | |
fc432dd9 | 763 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 764 | cred->gc_service = gss_auth->service; |
1da177e4 LT |
765 | return &cred->gc_base; |
766 | ||
767 | out_err: | |
8885cb36 | 768 | dprintk("RPC: gss_create_cred failed with error %d\n", err); |
1da177e4 LT |
769 | return ERR_PTR(err); |
770 | } | |
771 | ||
fba3bad4 TM |
772 | static int |
773 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
774 | { | |
775 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
776 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
777 | int err; | |
778 | ||
779 | do { | |
780 | err = gss_create_upcall(gss_auth, gss_cred); | |
781 | } while (err == -EAGAIN); | |
782 | return err; | |
783 | } | |
784 | ||
1da177e4 | 785 | static int |
8a317760 | 786 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
787 | { |
788 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
789 | ||
8a317760 TM |
790 | /* |
791 | * If the searchflags have set RPCAUTH_LOOKUP_NEW, then | |
792 | * we don't really care if the credential has expired or not, | |
793 | * since the caller should be prepared to reinitialise it. | |
794 | */ | |
fc432dd9 | 795 | if ((flags & RPCAUTH_LOOKUP_NEW) && test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 796 | goto out; |
1da177e4 LT |
797 | /* Don't match with creds that have expired. */ |
798 | if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) | |
799 | return 0; | |
8a317760 | 800 | out: |
1da177e4 LT |
801 | return (rc->cr_uid == acred->uid); |
802 | } | |
803 | ||
804 | /* | |
805 | * Marshal credentials. | |
806 | * Maybe we should keep a cached credential for performance reasons. | |
807 | */ | |
d8ed029d AD |
808 | static __be32 * |
809 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
810 | { |
811 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
812 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
813 | gc_base); | |
814 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 815 | __be32 *cred_len; |
1da177e4 LT |
816 | struct rpc_rqst *req = task->tk_rqstp; |
817 | u32 maj_stat = 0; | |
818 | struct xdr_netobj mic; | |
819 | struct kvec iov; | |
820 | struct xdr_buf verf_buf; | |
821 | ||
8885cb36 | 822 | dprintk("RPC: %5u gss_marshal\n", task->tk_pid); |
1da177e4 LT |
823 | |
824 | *p++ = htonl(RPC_AUTH_GSS); | |
825 | cred_len = p++; | |
826 | ||
827 | spin_lock(&ctx->gc_seq_lock); | |
828 | req->rq_seqno = ctx->gc_seq++; | |
829 | spin_unlock(&ctx->gc_seq_lock); | |
830 | ||
831 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
832 | *p++ = htonl((u32) ctx->gc_proc); | |
833 | *p++ = htonl((u32) req->rq_seqno); | |
834 | *p++ = htonl((u32) gss_cred->gc_service); | |
835 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
836 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
837 | ||
838 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
839 | * starting with the xid and ending at the end of the credential: */ | |
808012fb CL |
840 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
841 | req->rq_snd_buf.head[0].iov_base); | |
1da177e4 LT |
842 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
843 | xdr_buf_from_iov(&iov, &verf_buf); | |
844 | ||
845 | /* set verifier flavor*/ | |
846 | *p++ = htonl(RPC_AUTH_GSS); | |
847 | ||
848 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 849 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 850 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 851 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
852 | } else if (maj_stat != 0) { |
853 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
854 | goto out_put_ctx; | |
855 | } | |
856 | p = xdr_encode_opaque(p, NULL, mic.len); | |
857 | gss_put_ctx(ctx); | |
858 | return p; | |
859 | out_put_ctx: | |
860 | gss_put_ctx(ctx); | |
861 | return NULL; | |
862 | } | |
863 | ||
864 | /* | |
865 | * Refresh credentials. XXX - finish | |
866 | */ | |
867 | static int | |
868 | gss_refresh(struct rpc_task *task) | |
869 | { | |
870 | ||
871 | if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) | |
872 | return gss_refresh_upcall(task); | |
873 | return 0; | |
874 | } | |
875 | ||
d8ed029d AD |
876 | static __be32 * |
877 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
878 | { |
879 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1da177e4 | 880 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 881 | __be32 seq; |
1da177e4 LT |
882 | struct kvec iov; |
883 | struct xdr_buf verf_buf; | |
884 | struct xdr_netobj mic; | |
885 | u32 flav,len; | |
886 | u32 maj_stat; | |
887 | ||
8885cb36 | 888 | dprintk("RPC: %5u gss_validate\n", task->tk_pid); |
1da177e4 LT |
889 | |
890 | flav = ntohl(*p++); | |
891 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 892 | goto out_bad; |
1da177e4 LT |
893 | if (flav != RPC_AUTH_GSS) |
894 | goto out_bad; | |
895 | seq = htonl(task->tk_rqstp->rq_seqno); | |
896 | iov.iov_base = &seq; | |
897 | iov.iov_len = sizeof(seq); | |
898 | xdr_buf_from_iov(&iov, &verf_buf); | |
899 | mic.data = (u8 *)p; | |
900 | mic.len = len; | |
901 | ||
00fd6e14 | 902 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 903 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 904 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
905 | if (maj_stat) |
906 | goto out_bad; | |
24b2605b BF |
907 | /* We leave it to unwrap to calculate au_rslack. For now we just |
908 | * calculate the length of the verifier: */ | |
909 | task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2; | |
1da177e4 | 910 | gss_put_ctx(ctx); |
8885cb36 | 911 | dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", |
1da177e4 LT |
912 | task->tk_pid); |
913 | return p + XDR_QUADLEN(len); | |
914 | out_bad: | |
915 | gss_put_ctx(ctx); | |
8885cb36 | 916 | dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); |
1da177e4 LT |
917 | return NULL; |
918 | } | |
919 | ||
920 | static inline int | |
921 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 922 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
923 | { |
924 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
925 | struct xdr_buf integ_buf; | |
d8ed029d | 926 | __be32 *integ_len = NULL; |
1da177e4 | 927 | struct xdr_netobj mic; |
d8ed029d AD |
928 | u32 offset; |
929 | __be32 *q; | |
1da177e4 LT |
930 | struct kvec *iov; |
931 | u32 maj_stat = 0; | |
932 | int status = -EIO; | |
933 | ||
934 | integ_len = p++; | |
935 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
936 | *p++ = htonl(rqstp->rq_seqno); | |
937 | ||
938 | status = encode(rqstp, p, obj); | |
939 | if (status) | |
940 | return status; | |
941 | ||
942 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
943 | offset, snd_buf->len - offset)) | |
944 | return status; | |
945 | *integ_len = htonl(integ_buf.len); | |
946 | ||
947 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 948 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
949 | iov = snd_buf->tail; |
950 | else | |
951 | iov = snd_buf->head; | |
952 | p = iov->iov_base + iov->iov_len; | |
953 | mic.data = (u8 *)(p + 1); | |
954 | ||
00fd6e14 | 955 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
956 | status = -EIO; /* XXX? */ |
957 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 958 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
959 | else if (maj_stat) |
960 | return status; | |
961 | q = xdr_encode_opaque(p, NULL, mic.len); | |
962 | ||
963 | offset = (u8 *)q - (u8 *)p; | |
964 | iov->iov_len += offset; | |
965 | snd_buf->len += offset; | |
966 | return 0; | |
967 | } | |
968 | ||
2d2da60c BF |
969 | static void |
970 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
971 | { | |
972 | int i; | |
973 | ||
974 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
975 | __free_page(rqstp->rq_enc_pages[i]); | |
976 | kfree(rqstp->rq_enc_pages); | |
977 | } | |
978 | ||
979 | static int | |
980 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
981 | { | |
982 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
983 | int first, last, i; | |
984 | ||
985 | if (snd_buf->page_len == 0) { | |
986 | rqstp->rq_enc_pages_num = 0; | |
987 | return 0; | |
988 | } | |
989 | ||
990 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
991 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
992 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
993 | rqstp->rq_enc_pages | |
994 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
995 | GFP_NOFS); | |
996 | if (!rqstp->rq_enc_pages) | |
997 | goto out; | |
998 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
999 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1000 | if (rqstp->rq_enc_pages[i] == NULL) | |
1001 | goto out_free; | |
1002 | } | |
1003 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1004 | return 0; | |
1005 | out_free: | |
1006 | for (i--; i >= 0; i--) { | |
1007 | __free_page(rqstp->rq_enc_pages[i]); | |
1008 | } | |
1009 | out: | |
1010 | return -EAGAIN; | |
1011 | } | |
1012 | ||
1013 | static inline int | |
1014 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1015 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
2d2da60c BF |
1016 | { |
1017 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1018 | u32 offset; | |
1019 | u32 maj_stat; | |
1020 | int status; | |
d8ed029d | 1021 | __be32 *opaque_len; |
2d2da60c BF |
1022 | struct page **inpages; |
1023 | int first; | |
1024 | int pad; | |
1025 | struct kvec *iov; | |
1026 | char *tmp; | |
1027 | ||
1028 | opaque_len = p++; | |
1029 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1030 | *p++ = htonl(rqstp->rq_seqno); | |
1031 | ||
1032 | status = encode(rqstp, p, obj); | |
1033 | if (status) | |
1034 | return status; | |
1035 | ||
1036 | status = alloc_enc_pages(rqstp); | |
1037 | if (status) | |
1038 | return status; | |
1039 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1040 | inpages = snd_buf->pages + first; | |
1041 | snd_buf->pages = rqstp->rq_enc_pages; | |
1042 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
1043 | /* Give the tail its own page, in case we need extra space in the | |
1044 | * head when wrapping: */ | |
1045 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { | |
1046 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1047 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1048 | snd_buf->tail[0].iov_base = tmp; | |
1049 | } | |
00fd6e14 | 1050 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
2d2da60c BF |
1051 | /* RPC_SLACK_SPACE should prevent this ever happening: */ |
1052 | BUG_ON(snd_buf->len > snd_buf->buflen); | |
cca5172a | 1053 | status = -EIO; |
2d2da60c BF |
1054 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1055 | * done anyway, so it's safe to put the request on the wire: */ | |
1056 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1057 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1058 | else if (maj_stat) |
1059 | return status; | |
1060 | ||
1061 | *opaque_len = htonl(snd_buf->len - offset); | |
1062 | /* guess whether we're in the head or the tail: */ | |
1063 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1064 | iov = snd_buf->tail; | |
1065 | else | |
1066 | iov = snd_buf->head; | |
1067 | p = iov->iov_base + iov->iov_len; | |
1068 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1069 | memset(p, 0, pad); | |
1070 | iov->iov_len += pad; | |
1071 | snd_buf->len += pad; | |
1072 | ||
1073 | return 0; | |
1074 | } | |
1075 | ||
1da177e4 LT |
1076 | static int |
1077 | gss_wrap_req(struct rpc_task *task, | |
d8ed029d | 1078 | kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1079 | { |
1080 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1081 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1082 | gc_base); | |
1083 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1084 | int status = -EIO; | |
1085 | ||
8885cb36 | 1086 | dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); |
1da177e4 LT |
1087 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1088 | /* The spec seems a little ambiguous here, but I think that not | |
1089 | * wrapping context destruction requests makes the most sense. | |
1090 | */ | |
1091 | status = encode(rqstp, p, obj); | |
1092 | goto out; | |
1093 | } | |
1094 | switch (gss_cred->gc_service) { | |
1095 | case RPC_GSS_SVC_NONE: | |
1096 | status = encode(rqstp, p, obj); | |
1097 | break; | |
1098 | case RPC_GSS_SVC_INTEGRITY: | |
1099 | status = gss_wrap_req_integ(cred, ctx, encode, | |
1100 | rqstp, p, obj); | |
1101 | break; | |
cca5172a | 1102 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1103 | status = gss_wrap_req_priv(cred, ctx, encode, |
1104 | rqstp, p, obj); | |
1da177e4 LT |
1105 | break; |
1106 | } | |
1107 | out: | |
1108 | gss_put_ctx(ctx); | |
8885cb36 | 1109 | dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); |
1da177e4 LT |
1110 | return status; |
1111 | } | |
1112 | ||
1113 | static inline int | |
1114 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1115 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1116 | { |
1117 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1118 | struct xdr_buf integ_buf; | |
1119 | struct xdr_netobj mic; | |
1120 | u32 data_offset, mic_offset; | |
1121 | u32 integ_len; | |
1122 | u32 maj_stat; | |
1123 | int status = -EIO; | |
1124 | ||
1125 | integ_len = ntohl(*(*p)++); | |
1126 | if (integ_len & 3) | |
1127 | return status; | |
1128 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1129 | mic_offset = integ_len + data_offset; | |
1130 | if (mic_offset > rcv_buf->len) | |
1131 | return status; | |
1132 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1133 | return status; | |
1134 | ||
1135 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1136 | mic_offset - data_offset)) | |
1137 | return status; | |
1138 | ||
1139 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1140 | return status; | |
1141 | ||
00fd6e14 | 1142 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1143 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1144 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1145 | if (maj_stat != GSS_S_COMPLETE) |
1146 | return status; | |
1147 | return 0; | |
1148 | } | |
1149 | ||
2d2da60c BF |
1150 | static inline int |
1151 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1152 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1153 | { |
1154 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1155 | u32 offset; | |
1156 | u32 opaque_len; | |
1157 | u32 maj_stat; | |
1158 | int status = -EIO; | |
1159 | ||
1160 | opaque_len = ntohl(*(*p)++); | |
1161 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1162 | if (offset + opaque_len > rcv_buf->len) | |
1163 | return status; | |
1164 | /* remove padding: */ | |
1165 | rcv_buf->len = offset + opaque_len; | |
1166 | ||
00fd6e14 | 1167 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1168 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1169 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1170 | if (maj_stat != GSS_S_COMPLETE) |
1171 | return status; | |
1172 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1173 | return status; | |
1174 | ||
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | ||
1da177e4 LT |
1179 | static int |
1180 | gss_unwrap_resp(struct rpc_task *task, | |
d8ed029d | 1181 | kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1182 | { |
1183 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1184 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1185 | gc_base); | |
1186 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1187 | __be32 *savedp = p; |
2d2da60c BF |
1188 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1189 | int savedlen = head->iov_len; | |
1da177e4 LT |
1190 | int status = -EIO; |
1191 | ||
1192 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1193 | goto out_decode; | |
1194 | switch (gss_cred->gc_service) { | |
1195 | case RPC_GSS_SVC_NONE: | |
1196 | break; | |
1197 | case RPC_GSS_SVC_INTEGRITY: | |
1198 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1199 | if (status) | |
1200 | goto out; | |
1201 | break; | |
cca5172a | 1202 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1203 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); |
1204 | if (status) | |
1205 | goto out; | |
1da177e4 LT |
1206 | break; |
1207 | } | |
24b2605b | 1208 | /* take into account extra slack for integrity and privacy cases: */ |
2d2da60c BF |
1209 | task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp) |
1210 | + (savedlen - head->iov_len); | |
1da177e4 LT |
1211 | out_decode: |
1212 | status = decode(rqstp, p, obj); | |
1213 | out: | |
1214 | gss_put_ctx(ctx); | |
8885cb36 | 1215 | dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, |
1da177e4 LT |
1216 | status); |
1217 | return status; | |
1218 | } | |
cca5172a | 1219 | |
f1c0a861 | 1220 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1221 | .owner = THIS_MODULE, |
1222 | .au_flavor = RPC_AUTH_GSS, | |
1223 | #ifdef RPC_DEBUG | |
1224 | .au_name = "RPCSEC_GSS", | |
1225 | #endif | |
1226 | .create = gss_create, | |
1227 | .destroy = gss_destroy, | |
1228 | .lookup_cred = gss_lookup_cred, | |
1229 | .crcreate = gss_create_cred | |
1230 | }; | |
1231 | ||
f1c0a861 | 1232 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1233 | .cr_name = "AUTH_GSS", |
1234 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1235 | .cr_init = gss_cred_init, |
1da177e4 LT |
1236 | .crmatch = gss_match, |
1237 | .crmarshal = gss_marshal, | |
1238 | .crrefresh = gss_refresh, | |
1239 | .crvalidate = gss_validate, | |
1240 | .crwrap_req = gss_wrap_req, | |
1241 | .crunwrap_resp = gss_unwrap_resp, | |
1242 | }; | |
1243 | ||
1244 | static struct rpc_pipe_ops gss_upcall_ops = { | |
1245 | .upcall = gss_pipe_upcall, | |
1246 | .downcall = gss_pipe_downcall, | |
1247 | .destroy_msg = gss_pipe_destroy_msg, | |
1248 | .release_pipe = gss_pipe_release, | |
1249 | }; | |
1250 | ||
1251 | /* | |
1252 | * Initialize RPCSEC_GSS module | |
1253 | */ | |
1254 | static int __init init_rpcsec_gss(void) | |
1255 | { | |
1256 | int err = 0; | |
1257 | ||
1258 | err = rpcauth_register(&authgss_ops); | |
1259 | if (err) | |
1260 | goto out; | |
1261 | err = gss_svc_init(); | |
1262 | if (err) | |
1263 | goto out_unregister; | |
1264 | return 0; | |
1265 | out_unregister: | |
1266 | rpcauth_unregister(&authgss_ops); | |
1267 | out: | |
1268 | return err; | |
1269 | } | |
1270 | ||
1271 | static void __exit exit_rpcsec_gss(void) | |
1272 | { | |
1273 | gss_svc_shutdown(); | |
1274 | rpcauth_unregister(&authgss_ops); | |
1275 | } | |
1276 | ||
1277 | MODULE_LICENSE("GPL"); | |
1278 | module_init(init_rpcsec_gss) | |
1279 | module_exit(exit_rpcsec_gss) |