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; |
0df7fb74 | 60 | static const struct rpc_credops gss_nullops; |
1da177e4 LT |
61 | |
62 | #ifdef RPC_DEBUG | |
63 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
64 | #endif | |
65 | ||
66 | #define NFS_NGROUPS 16 | |
67 | ||
1da177e4 LT |
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 | ||
1da177e4 | 82 | struct gss_auth { |
0285ed1f | 83 | struct kref kref; |
1da177e4 LT |
84 | struct rpc_auth rpc_auth; |
85 | struct gss_api_mech *mech; | |
86 | enum rpc_gss_svc service; | |
1da177e4 LT |
87 | struct rpc_clnt *client; |
88 | struct dentry *dentry; | |
1da177e4 LT |
89 | }; |
90 | ||
5d28dc82 | 91 | static void gss_free_ctx(struct gss_cl_ctx *); |
1da177e4 LT |
92 | static struct rpc_pipe_ops gss_upcall_ops; |
93 | ||
1da177e4 LT |
94 | static inline struct gss_cl_ctx * |
95 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
96 | { | |
97 | atomic_inc(&ctx->count); | |
98 | return ctx; | |
99 | } | |
100 | ||
101 | static inline void | |
102 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
103 | { | |
104 | if (atomic_dec_and_test(&ctx->count)) | |
5d28dc82 | 105 | gss_free_ctx(ctx); |
1da177e4 LT |
106 | } |
107 | ||
5d28dc82 TM |
108 | /* gss_cred_set_ctx: |
109 | * called by gss_upcall_callback and gss_create_upcall in order | |
110 | * to set the gss context. The actual exchange of an old context | |
111 | * and a new one is protected by the inode->i_lock. | |
112 | */ | |
1da177e4 LT |
113 | static void |
114 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
115 | { | |
116 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
5d28dc82 | 117 | |
cd019f75 TM |
118 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
119 | return; | |
7b6962b0 | 120 | gss_get_ctx(ctx); |
5d28dc82 | 121 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 | 122 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
cd019f75 | 123 | smp_mb__before_clear_bit(); |
fc432dd9 | 124 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
1da177e4 LT |
125 | } |
126 | ||
127 | static const void * | |
128 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
129 | { | |
130 | const void *q = (const void *)((const char *)p + len); | |
131 | if (unlikely(q > end || q < p)) | |
132 | return ERR_PTR(-EFAULT); | |
133 | memcpy(res, p, len); | |
134 | return q; | |
135 | } | |
136 | ||
137 | static inline const void * | |
138 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
139 | { | |
140 | const void *q; | |
141 | unsigned int len; | |
142 | ||
143 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
144 | if (IS_ERR(p)) | |
145 | return p; | |
146 | q = (const void *)((const char *)p + len); | |
147 | if (unlikely(q > end || q < p)) | |
148 | return ERR_PTR(-EFAULT); | |
e69062b4 | 149 | dest->data = kmemdup(p, len, GFP_KERNEL); |
1da177e4 LT |
150 | if (unlikely(dest->data == NULL)) |
151 | return ERR_PTR(-ENOMEM); | |
152 | dest->len = len; | |
1da177e4 LT |
153 | return q; |
154 | } | |
155 | ||
156 | static struct gss_cl_ctx * | |
157 | gss_cred_get_ctx(struct rpc_cred *cred) | |
158 | { | |
159 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
160 | struct gss_cl_ctx *ctx = NULL; | |
161 | ||
5d28dc82 | 162 | rcu_read_lock(); |
1da177e4 LT |
163 | if (gss_cred->gc_ctx) |
164 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
5d28dc82 | 165 | rcu_read_unlock(); |
1da177e4 LT |
166 | return ctx; |
167 | } | |
168 | ||
169 | static struct gss_cl_ctx * | |
170 | gss_alloc_context(void) | |
171 | { | |
172 | struct gss_cl_ctx *ctx; | |
173 | ||
0da974f4 | 174 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
1da177e4 | 175 | if (ctx != NULL) { |
1da177e4 LT |
176 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
177 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
178 | spin_lock_init(&ctx->gc_seq_lock); | |
179 | atomic_set(&ctx->count,1); | |
180 | } | |
181 | return ctx; | |
182 | } | |
183 | ||
184 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
185 | static const void * | |
186 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
187 | { | |
188 | const void *q; | |
189 | unsigned int seclen; | |
190 | unsigned int timeout; | |
191 | u32 window_size; | |
192 | int ret; | |
193 | ||
194 | /* First unsigned int gives the lifetime (in seconds) of the cred */ | |
195 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); | |
196 | if (IS_ERR(p)) | |
197 | goto err; | |
198 | if (timeout == 0) | |
199 | timeout = GSSD_MIN_TIMEOUT; | |
200 | ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; | |
201 | /* Sequence number window. Determines the maximum number of simultaneous requests */ | |
202 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); | |
203 | if (IS_ERR(p)) | |
204 | goto err; | |
205 | ctx->gc_win = window_size; | |
206 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
207 | if (ctx->gc_win == 0) { | |
208 | /* in which case, p points to an error code which we ignore */ | |
209 | p = ERR_PTR(-EACCES); | |
210 | goto err; | |
211 | } | |
212 | /* copy the opaque wire context */ | |
213 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
214 | if (IS_ERR(p)) | |
215 | goto err; | |
216 | /* import the opaque security context */ | |
217 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
218 | if (IS_ERR(p)) | |
219 | goto err; | |
220 | q = (const void *)((const char *)p + seclen); | |
221 | if (unlikely(q > end || q < p)) { | |
222 | p = ERR_PTR(-EFAULT); | |
223 | goto err; | |
224 | } | |
225 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); | |
226 | if (ret < 0) { | |
227 | p = ERR_PTR(ret); | |
228 | goto err; | |
229 | } | |
230 | return q; | |
231 | err: | |
8885cb36 | 232 | dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); |
1da177e4 LT |
233 | return p; |
234 | } | |
235 | ||
236 | ||
237 | struct gss_upcall_msg { | |
238 | atomic_t count; | |
239 | uid_t uid; | |
240 | struct rpc_pipe_msg msg; | |
241 | struct list_head list; | |
242 | struct gss_auth *auth; | |
243 | struct rpc_wait_queue rpc_waitqueue; | |
244 | wait_queue_head_t waitqueue; | |
245 | struct gss_cl_ctx *ctx; | |
246 | }; | |
247 | ||
248 | static void | |
249 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
250 | { | |
251 | if (!atomic_dec_and_test(&gss_msg->count)) | |
252 | return; | |
253 | BUG_ON(!list_empty(&gss_msg->list)); | |
254 | if (gss_msg->ctx != NULL) | |
255 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 256 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
1da177e4 LT |
257 | kfree(gss_msg); |
258 | } | |
259 | ||
260 | static struct gss_upcall_msg * | |
6e84c7b6 | 261 | __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) |
1da177e4 LT |
262 | { |
263 | struct gss_upcall_msg *pos; | |
6e84c7b6 | 264 | list_for_each_entry(pos, &rpci->in_downcall, list) { |
1da177e4 LT |
265 | if (pos->uid != uid) |
266 | continue; | |
267 | atomic_inc(&pos->count); | |
8885cb36 | 268 | dprintk("RPC: gss_find_upcall found msg %p\n", pos); |
1da177e4 LT |
269 | return pos; |
270 | } | |
8885cb36 | 271 | dprintk("RPC: gss_find_upcall found nothing\n"); |
1da177e4 LT |
272 | return NULL; |
273 | } | |
274 | ||
275 | /* Try to add a upcall to the pipefs queue. | |
276 | * If an upcall owned by our uid already exists, then we return a reference | |
277 | * to that upcall instead of adding the new upcall. | |
278 | */ | |
279 | static inline struct gss_upcall_msg * | |
280 | gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) | |
281 | { | |
b185f835 | 282 | struct inode *inode = gss_auth->dentry->d_inode; |
6e84c7b6 | 283 | struct rpc_inode *rpci = RPC_I(inode); |
1da177e4 LT |
284 | struct gss_upcall_msg *old; |
285 | ||
b185f835 | 286 | spin_lock(&inode->i_lock); |
6e84c7b6 | 287 | old = __gss_find_upcall(rpci, gss_msg->uid); |
1da177e4 LT |
288 | if (old == NULL) { |
289 | atomic_inc(&gss_msg->count); | |
6e84c7b6 | 290 | list_add(&gss_msg->list, &rpci->in_downcall); |
1da177e4 LT |
291 | } else |
292 | gss_msg = old; | |
b185f835 | 293 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
294 | return gss_msg; |
295 | } | |
296 | ||
297 | static void | |
298 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
299 | { | |
1da177e4 LT |
300 | list_del_init(&gss_msg->list); |
301 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
302 | wake_up_all(&gss_msg->waitqueue); | |
303 | atomic_dec(&gss_msg->count); | |
304 | } | |
305 | ||
306 | static void | |
307 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
308 | { | |
309 | struct gss_auth *gss_auth = gss_msg->auth; | |
b185f835 | 310 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 | 311 | |
3b68aaea TM |
312 | if (list_empty(&gss_msg->list)) |
313 | return; | |
b185f835 | 314 | spin_lock(&inode->i_lock); |
3b68aaea TM |
315 | if (!list_empty(&gss_msg->list)) |
316 | __gss_unhash_msg(gss_msg); | |
b185f835 | 317 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
318 | } |
319 | ||
320 | static void | |
321 | gss_upcall_callback(struct rpc_task *task) | |
322 | { | |
323 | struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, | |
324 | struct gss_cred, gc_base); | |
325 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
b185f835 | 326 | struct inode *inode = gss_msg->auth->dentry->d_inode; |
1da177e4 | 327 | |
5d28dc82 | 328 | spin_lock(&inode->i_lock); |
1da177e4 | 329 | if (gss_msg->ctx) |
7b6962b0 | 330 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); |
1da177e4 LT |
331 | else |
332 | task->tk_status = gss_msg->msg.errno; | |
1da177e4 LT |
333 | gss_cred->gc_upcall = NULL; |
334 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
b185f835 | 335 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
336 | gss_release_msg(gss_msg); |
337 | } | |
338 | ||
339 | static inline struct gss_upcall_msg * | |
340 | gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) | |
341 | { | |
342 | struct gss_upcall_msg *gss_msg; | |
343 | ||
0da974f4 | 344 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL); |
1da177e4 | 345 | if (gss_msg != NULL) { |
1da177e4 LT |
346 | INIT_LIST_HEAD(&gss_msg->list); |
347 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
348 | init_waitqueue_head(&gss_msg->waitqueue); | |
349 | atomic_set(&gss_msg->count, 1); | |
350 | gss_msg->msg.data = &gss_msg->uid; | |
351 | gss_msg->msg.len = sizeof(gss_msg->uid); | |
352 | gss_msg->uid = uid; | |
353 | gss_msg->auth = gss_auth; | |
354 | } | |
355 | return gss_msg; | |
356 | } | |
357 | ||
358 | static struct gss_upcall_msg * | |
359 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
360 | { | |
7c67db3a TM |
361 | struct gss_cred *gss_cred = container_of(cred, |
362 | struct gss_cred, gc_base); | |
1da177e4 | 363 | struct gss_upcall_msg *gss_new, *gss_msg; |
7c67db3a | 364 | uid_t uid = cred->cr_uid; |
1da177e4 | 365 | |
7c67db3a TM |
366 | /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */ |
367 | if (gss_cred->gc_machine_cred != 0) | |
368 | uid = 0; | |
369 | ||
370 | gss_new = gss_alloc_msg(gss_auth, uid); | |
1da177e4 LT |
371 | if (gss_new == NULL) |
372 | return ERR_PTR(-ENOMEM); | |
373 | gss_msg = gss_add_msg(gss_auth, gss_new); | |
374 | if (gss_msg == gss_new) { | |
375 | int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); | |
376 | if (res) { | |
377 | gss_unhash_msg(gss_new); | |
378 | gss_msg = ERR_PTR(res); | |
379 | } | |
380 | } else | |
381 | gss_release_msg(gss_new); | |
382 | return gss_msg; | |
383 | } | |
384 | ||
385 | static inline int | |
386 | gss_refresh_upcall(struct rpc_task *task) | |
387 | { | |
388 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
4a8c1344 | 389 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
390 | struct gss_auth, rpc_auth); |
391 | struct gss_cred *gss_cred = container_of(cred, | |
392 | struct gss_cred, gc_base); | |
393 | struct gss_upcall_msg *gss_msg; | |
b185f835 | 394 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 LT |
395 | int err = 0; |
396 | ||
8885cb36 CL |
397 | dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, |
398 | cred->cr_uid); | |
1da177e4 LT |
399 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
400 | if (IS_ERR(gss_msg)) { | |
401 | err = PTR_ERR(gss_msg); | |
402 | goto out; | |
403 | } | |
b185f835 | 404 | spin_lock(&inode->i_lock); |
1da177e4 | 405 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 406 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
7b6962b0 TM |
407 | else if (gss_msg->ctx != NULL) { |
408 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); | |
409 | gss_cred->gc_upcall = NULL; | |
410 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
411 | } else if (gss_msg->msg.errno >= 0) { | |
1da177e4 LT |
412 | task->tk_timeout = 0; |
413 | gss_cred->gc_upcall = gss_msg; | |
414 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
415 | atomic_inc(&gss_msg->count); | |
5d00837b | 416 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
1da177e4 LT |
417 | } else |
418 | err = gss_msg->msg.errno; | |
b185f835 | 419 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
420 | gss_release_msg(gss_msg); |
421 | out: | |
8885cb36 CL |
422 | dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", |
423 | task->tk_pid, cred->cr_uid, err); | |
1da177e4 LT |
424 | return err; |
425 | } | |
426 | ||
427 | static inline int | |
428 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
429 | { | |
b185f835 | 430 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 LT |
431 | struct rpc_cred *cred = &gss_cred->gc_base; |
432 | struct gss_upcall_msg *gss_msg; | |
433 | DEFINE_WAIT(wait); | |
434 | int err = 0; | |
435 | ||
8885cb36 | 436 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); |
1da177e4 LT |
437 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
438 | if (IS_ERR(gss_msg)) { | |
439 | err = PTR_ERR(gss_msg); | |
440 | goto out; | |
441 | } | |
442 | for (;;) { | |
443 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); | |
b185f835 | 444 | spin_lock(&inode->i_lock); |
1da177e4 | 445 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
446 | break; |
447 | } | |
b185f835 | 448 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
449 | if (signalled()) { |
450 | err = -ERESTARTSYS; | |
451 | goto out_intr; | |
452 | } | |
453 | schedule(); | |
454 | } | |
455 | if (gss_msg->ctx) | |
7b6962b0 | 456 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
457 | else |
458 | err = gss_msg->msg.errno; | |
5d28dc82 | 459 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
460 | out_intr: |
461 | finish_wait(&gss_msg->waitqueue, &wait); | |
462 | gss_release_msg(gss_msg); | |
463 | out: | |
8885cb36 CL |
464 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", |
465 | cred->cr_uid, err); | |
1da177e4 LT |
466 | return err; |
467 | } | |
468 | ||
469 | static ssize_t | |
470 | gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, | |
471 | char __user *dst, size_t buflen) | |
472 | { | |
473 | char *data = (char *)msg->data + msg->copied; | |
7df08995 CL |
474 | size_t mlen = min(msg->len, buflen); |
475 | unsigned long left; | |
1da177e4 | 476 | |
1da177e4 | 477 | left = copy_to_user(dst, data, mlen); |
7df08995 CL |
478 | if (left == mlen) { |
479 | msg->errno = -EFAULT; | |
480 | return -EFAULT; | |
1da177e4 | 481 | } |
7df08995 | 482 | |
1da177e4 LT |
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); | |
ffc40f56 | 541 | gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES; |
3b68aaea | 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) { | |
3392c349 | 626 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", |
0dc47877 | 627 | __func__, flavor); |
1da177e4 LT |
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); | |
0285ed1f | 639 | kref_init(&gss_auth->kref); |
1da177e4 | 640 | |
158998b6 TM |
641 | gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, |
642 | clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
6a19275a BF |
643 | if (IS_ERR(gss_auth->dentry)) { |
644 | err = PTR_ERR(gss_auth->dentry); | |
1da177e4 | 645 | goto err_put_mech; |
6a19275a | 646 | } |
1da177e4 | 647 | |
f5c2187c | 648 | err = rpcauth_init_credcache(auth); |
07a2bf1d TM |
649 | if (err) |
650 | goto err_unlink_pipe; | |
651 | ||
1da177e4 | 652 | return auth; |
07a2bf1d TM |
653 | err_unlink_pipe: |
654 | rpc_unlink(gss_auth->dentry); | |
1da177e4 LT |
655 | err_put_mech: |
656 | gss_mech_put(gss_auth->mech); | |
657 | err_free: | |
658 | kfree(gss_auth); | |
659 | out_dec: | |
660 | module_put(THIS_MODULE); | |
6a19275a | 661 | return ERR_PTR(err); |
1da177e4 LT |
662 | } |
663 | ||
0285ed1f TM |
664 | static void |
665 | gss_free(struct gss_auth *gss_auth) | |
666 | { | |
667 | rpc_unlink(gss_auth->dentry); | |
668 | gss_auth->dentry = NULL; | |
669 | gss_mech_put(gss_auth->mech); | |
670 | ||
671 | kfree(gss_auth); | |
672 | module_put(THIS_MODULE); | |
673 | } | |
674 | ||
675 | static void | |
676 | gss_free_callback(struct kref *kref) | |
677 | { | |
678 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
679 | ||
680 | gss_free(gss_auth); | |
681 | } | |
682 | ||
1da177e4 LT |
683 | static void |
684 | gss_destroy(struct rpc_auth *auth) | |
685 | { | |
686 | struct gss_auth *gss_auth; | |
687 | ||
8885cb36 CL |
688 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
689 | auth, auth->au_flavor); | |
1da177e4 | 690 | |
3ab9bb72 TM |
691 | rpcauth_destroy_credcache(auth); |
692 | ||
1da177e4 | 693 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
0285ed1f | 694 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
695 | } |
696 | ||
0df7fb74 TM |
697 | /* |
698 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
699 | * to the server with the GSS control procedure field set to | |
700 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
701 | * all RPCSEC_GSS state associated with that context. | |
702 | */ | |
703 | static int | |
704 | gss_destroying_context(struct rpc_cred *cred) | |
705 | { | |
706 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
707 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
708 | struct rpc_task *task; | |
709 | ||
710 | if (gss_cred->gc_ctx == NULL || | |
080a1f14 | 711 | test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
0df7fb74 TM |
712 | return 0; |
713 | ||
714 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
715 | cred->cr_ops = &gss_nullops; | |
716 | ||
717 | /* Take a reference to ensure the cred will be destroyed either | |
718 | * by the RPC call or by the put_rpccred() below */ | |
719 | get_rpccred(cred); | |
720 | ||
080a1f14 | 721 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
0df7fb74 TM |
722 | if (!IS_ERR(task)) |
723 | rpc_put_task(task); | |
724 | ||
725 | put_rpccred(cred); | |
726 | return 1; | |
727 | } | |
728 | ||
729 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
730 | * to create a new cred or context, so they check that things have been |
731 | * allocated before freeing them. */ | |
732 | static void | |
5d28dc82 | 733 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 734 | { |
5d28dc82 | 735 | dprintk("RPC: gss_free_ctx\n"); |
1da177e4 | 736 | |
1da177e4 LT |
737 | kfree(ctx->gc_wire_ctx.data); |
738 | kfree(ctx); | |
739 | } | |
740 | ||
5d28dc82 TM |
741 | static void |
742 | gss_free_ctx_callback(struct rcu_head *head) | |
743 | { | |
744 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
745 | gss_do_free_ctx(ctx); | |
746 | } | |
747 | ||
748 | static void | |
749 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
750 | { | |
a4deb81b TM |
751 | struct gss_ctx *gc_gss_ctx; |
752 | ||
753 | gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); | |
754 | rcu_assign_pointer(ctx->gc_gss_ctx, NULL); | |
5d28dc82 | 755 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); |
a4deb81b TM |
756 | if (gc_gss_ctx) |
757 | gss_delete_sec_context(&gc_gss_ctx); | |
5d28dc82 TM |
758 | } |
759 | ||
1da177e4 | 760 | static void |
31be5bf1 | 761 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 762 | { |
31be5bf1 | 763 | dprintk("RPC: gss_free_cred %p\n", gss_cred); |
31be5bf1 TM |
764 | kfree(gss_cred); |
765 | } | |
1da177e4 | 766 | |
31be5bf1 TM |
767 | static void |
768 | gss_free_cred_callback(struct rcu_head *head) | |
769 | { | |
770 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
771 | gss_free_cred(gss_cred); | |
772 | } | |
1da177e4 | 773 | |
31be5bf1 TM |
774 | static void |
775 | gss_destroy_cred(struct rpc_cred *cred) | |
776 | { | |
5d28dc82 | 777 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 778 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
5d28dc82 TM |
779 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
780 | ||
0df7fb74 TM |
781 | if (gss_destroying_context(cred)) |
782 | return; | |
5d28dc82 | 783 | rcu_assign_pointer(gss_cred->gc_ctx, NULL); |
31be5bf1 | 784 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
785 | if (ctx) |
786 | gss_put_ctx(ctx); | |
0285ed1f | 787 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
788 | } |
789 | ||
790 | /* | |
791 | * Lookup RPCSEC_GSS cred for the current process | |
792 | */ | |
793 | static struct rpc_cred * | |
8a317760 | 794 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 795 | { |
8a317760 | 796 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
797 | } |
798 | ||
799 | static struct rpc_cred * | |
8a317760 | 800 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
801 | { |
802 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
803 | struct gss_cred *cred = NULL; | |
804 | int err = -ENOMEM; | |
805 | ||
8885cb36 | 806 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", |
1da177e4 LT |
807 | acred->uid, auth->au_flavor); |
808 | ||
0da974f4 | 809 | if (!(cred = kzalloc(sizeof(*cred), GFP_KERNEL))) |
1da177e4 LT |
810 | goto out_err; |
811 | ||
5fe4755e | 812 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
813 | /* |
814 | * Note: in order to force a call to call_refresh(), we deliberately | |
815 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
816 | */ | |
fc432dd9 | 817 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 818 | cred->gc_service = gss_auth->service; |
7c67db3a | 819 | cred->gc_machine_cred = acred->machine_cred; |
0285ed1f | 820 | kref_get(&gss_auth->kref); |
1da177e4 LT |
821 | return &cred->gc_base; |
822 | ||
823 | out_err: | |
8885cb36 | 824 | dprintk("RPC: gss_create_cred failed with error %d\n", err); |
1da177e4 LT |
825 | return ERR_PTR(err); |
826 | } | |
827 | ||
fba3bad4 TM |
828 | static int |
829 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
830 | { | |
831 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
832 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
833 | int err; | |
834 | ||
835 | do { | |
836 | err = gss_create_upcall(gss_auth, gss_cred); | |
837 | } while (err == -EAGAIN); | |
838 | return err; | |
839 | } | |
840 | ||
1da177e4 | 841 | static int |
8a317760 | 842 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
843 | { |
844 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
845 | ||
cd019f75 | 846 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 847 | goto out; |
1da177e4 | 848 | /* Don't match with creds that have expired. */ |
cd019f75 TM |
849 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
850 | return 0; | |
851 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1da177e4 | 852 | return 0; |
8a317760 | 853 | out: |
7c67db3a TM |
854 | if (acred->machine_cred != gss_cred->gc_machine_cred) |
855 | return 0; | |
1da177e4 LT |
856 | return (rc->cr_uid == acred->uid); |
857 | } | |
858 | ||
859 | /* | |
860 | * Marshal credentials. | |
861 | * Maybe we should keep a cached credential for performance reasons. | |
862 | */ | |
d8ed029d AD |
863 | static __be32 * |
864 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
865 | { |
866 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
867 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
868 | gc_base); | |
869 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 870 | __be32 *cred_len; |
1da177e4 LT |
871 | struct rpc_rqst *req = task->tk_rqstp; |
872 | u32 maj_stat = 0; | |
873 | struct xdr_netobj mic; | |
874 | struct kvec iov; | |
875 | struct xdr_buf verf_buf; | |
876 | ||
8885cb36 | 877 | dprintk("RPC: %5u gss_marshal\n", task->tk_pid); |
1da177e4 LT |
878 | |
879 | *p++ = htonl(RPC_AUTH_GSS); | |
880 | cred_len = p++; | |
881 | ||
882 | spin_lock(&ctx->gc_seq_lock); | |
883 | req->rq_seqno = ctx->gc_seq++; | |
884 | spin_unlock(&ctx->gc_seq_lock); | |
885 | ||
886 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
887 | *p++ = htonl((u32) ctx->gc_proc); | |
888 | *p++ = htonl((u32) req->rq_seqno); | |
889 | *p++ = htonl((u32) gss_cred->gc_service); | |
890 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
891 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
892 | ||
893 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
894 | * starting with the xid and ending at the end of the credential: */ | |
808012fb CL |
895 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
896 | req->rq_snd_buf.head[0].iov_base); | |
1da177e4 LT |
897 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
898 | xdr_buf_from_iov(&iov, &verf_buf); | |
899 | ||
900 | /* set verifier flavor*/ | |
901 | *p++ = htonl(RPC_AUTH_GSS); | |
902 | ||
903 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 904 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 905 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 906 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
907 | } else if (maj_stat != 0) { |
908 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
909 | goto out_put_ctx; | |
910 | } | |
911 | p = xdr_encode_opaque(p, NULL, mic.len); | |
912 | gss_put_ctx(ctx); | |
913 | return p; | |
914 | out_put_ctx: | |
915 | gss_put_ctx(ctx); | |
916 | return NULL; | |
917 | } | |
918 | ||
cd019f75 TM |
919 | static int gss_renew_cred(struct rpc_task *task) |
920 | { | |
921 | struct rpc_cred *oldcred = task->tk_msg.rpc_cred; | |
922 | struct gss_cred *gss_cred = container_of(oldcred, | |
923 | struct gss_cred, | |
924 | gc_base); | |
925 | struct rpc_auth *auth = oldcred->cr_auth; | |
926 | struct auth_cred acred = { | |
927 | .uid = oldcred->cr_uid, | |
928 | .machine_cred = gss_cred->gc_machine_cred, | |
929 | }; | |
930 | struct rpc_cred *new; | |
931 | ||
932 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
933 | if (IS_ERR(new)) | |
934 | return PTR_ERR(new); | |
935 | task->tk_msg.rpc_cred = new; | |
936 | put_rpccred(oldcred); | |
937 | return 0; | |
938 | } | |
939 | ||
1da177e4 LT |
940 | /* |
941 | * Refresh credentials. XXX - finish | |
942 | */ | |
943 | static int | |
944 | gss_refresh(struct rpc_task *task) | |
945 | { | |
cd019f75 TM |
946 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
947 | int ret = 0; | |
948 | ||
949 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && | |
950 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
951 | ret = gss_renew_cred(task); | |
952 | if (ret < 0) | |
953 | goto out; | |
954 | cred = task->tk_msg.rpc_cred; | |
955 | } | |
1da177e4 | 956 | |
cd019f75 TM |
957 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
958 | ret = gss_refresh_upcall(task); | |
959 | out: | |
960 | return ret; | |
1da177e4 LT |
961 | } |
962 | ||
0df7fb74 TM |
963 | /* Dummy refresh routine: used only when destroying the context */ |
964 | static int | |
965 | gss_refresh_null(struct rpc_task *task) | |
966 | { | |
967 | return -EACCES; | |
968 | } | |
969 | ||
d8ed029d AD |
970 | static __be32 * |
971 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
972 | { |
973 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1da177e4 | 974 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 975 | __be32 seq; |
1da177e4 LT |
976 | struct kvec iov; |
977 | struct xdr_buf verf_buf; | |
978 | struct xdr_netobj mic; | |
979 | u32 flav,len; | |
980 | u32 maj_stat; | |
981 | ||
8885cb36 | 982 | dprintk("RPC: %5u gss_validate\n", task->tk_pid); |
1da177e4 LT |
983 | |
984 | flav = ntohl(*p++); | |
985 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 986 | goto out_bad; |
1da177e4 LT |
987 | if (flav != RPC_AUTH_GSS) |
988 | goto out_bad; | |
989 | seq = htonl(task->tk_rqstp->rq_seqno); | |
990 | iov.iov_base = &seq; | |
991 | iov.iov_len = sizeof(seq); | |
992 | xdr_buf_from_iov(&iov, &verf_buf); | |
993 | mic.data = (u8 *)p; | |
994 | mic.len = len; | |
995 | ||
00fd6e14 | 996 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 997 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 998 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 999 | if (maj_stat) { |
014313a9 | 1000 | dprintk("RPC: %5u gss_validate: gss_verify_mic returned " |
0df7fb74 | 1001 | "error 0x%08x\n", task->tk_pid, maj_stat); |
1da177e4 | 1002 | goto out_bad; |
0df7fb74 | 1003 | } |
24b2605b BF |
1004 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1005 | * calculate the length of the verifier: */ | |
1be27f36 | 1006 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 1007 | gss_put_ctx(ctx); |
8885cb36 | 1008 | dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", |
1da177e4 LT |
1009 | task->tk_pid); |
1010 | return p + XDR_QUADLEN(len); | |
1011 | out_bad: | |
1012 | gss_put_ctx(ctx); | |
8885cb36 | 1013 | dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); |
1da177e4 LT |
1014 | return NULL; |
1015 | } | |
1016 | ||
1017 | static inline int | |
1018 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1019 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1020 | { |
1021 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1022 | struct xdr_buf integ_buf; | |
d8ed029d | 1023 | __be32 *integ_len = NULL; |
1da177e4 | 1024 | struct xdr_netobj mic; |
d8ed029d AD |
1025 | u32 offset; |
1026 | __be32 *q; | |
1da177e4 LT |
1027 | struct kvec *iov; |
1028 | u32 maj_stat = 0; | |
1029 | int status = -EIO; | |
1030 | ||
1031 | integ_len = p++; | |
1032 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1033 | *p++ = htonl(rqstp->rq_seqno); | |
1034 | ||
be879c4e | 1035 | status = rpc_call_xdrproc(encode, rqstp, p, obj); |
1da177e4 LT |
1036 | if (status) |
1037 | return status; | |
1038 | ||
1039 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1040 | offset, snd_buf->len - offset)) | |
1041 | return status; | |
1042 | *integ_len = htonl(integ_buf.len); | |
1043 | ||
1044 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1045 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1046 | iov = snd_buf->tail; |
1047 | else | |
1048 | iov = snd_buf->head; | |
1049 | p = iov->iov_base + iov->iov_len; | |
1050 | mic.data = (u8 *)(p + 1); | |
1051 | ||
00fd6e14 | 1052 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1053 | status = -EIO; /* XXX? */ |
1054 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1055 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1056 | else if (maj_stat) |
1057 | return status; | |
1058 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1059 | ||
1060 | offset = (u8 *)q - (u8 *)p; | |
1061 | iov->iov_len += offset; | |
1062 | snd_buf->len += offset; | |
1063 | return 0; | |
1064 | } | |
1065 | ||
2d2da60c BF |
1066 | static void |
1067 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1068 | { | |
1069 | int i; | |
1070 | ||
1071 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1072 | __free_page(rqstp->rq_enc_pages[i]); | |
1073 | kfree(rqstp->rq_enc_pages); | |
1074 | } | |
1075 | ||
1076 | static int | |
1077 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1078 | { | |
1079 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1080 | int first, last, i; | |
1081 | ||
1082 | if (snd_buf->page_len == 0) { | |
1083 | rqstp->rq_enc_pages_num = 0; | |
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1088 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1089 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1090 | rqstp->rq_enc_pages | |
1091 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1092 | GFP_NOFS); | |
1093 | if (!rqstp->rq_enc_pages) | |
1094 | goto out; | |
1095 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1096 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1097 | if (rqstp->rq_enc_pages[i] == NULL) | |
1098 | goto out_free; | |
1099 | } | |
1100 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1101 | return 0; | |
1102 | out_free: | |
1103 | for (i--; i >= 0; i--) { | |
1104 | __free_page(rqstp->rq_enc_pages[i]); | |
1105 | } | |
1106 | out: | |
1107 | return -EAGAIN; | |
1108 | } | |
1109 | ||
1110 | static inline int | |
1111 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1112 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
2d2da60c BF |
1113 | { |
1114 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1115 | u32 offset; | |
1116 | u32 maj_stat; | |
1117 | int status; | |
d8ed029d | 1118 | __be32 *opaque_len; |
2d2da60c BF |
1119 | struct page **inpages; |
1120 | int first; | |
1121 | int pad; | |
1122 | struct kvec *iov; | |
1123 | char *tmp; | |
1124 | ||
1125 | opaque_len = p++; | |
1126 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1127 | *p++ = htonl(rqstp->rq_seqno); | |
1128 | ||
be879c4e | 1129 | status = rpc_call_xdrproc(encode, rqstp, p, obj); |
2d2da60c BF |
1130 | if (status) |
1131 | return status; | |
1132 | ||
1133 | status = alloc_enc_pages(rqstp); | |
1134 | if (status) | |
1135 | return status; | |
1136 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1137 | inpages = snd_buf->pages + first; | |
1138 | snd_buf->pages = rqstp->rq_enc_pages; | |
1139 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
1140 | /* Give the tail its own page, in case we need extra space in the | |
1141 | * head when wrapping: */ | |
1142 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { | |
1143 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1144 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1145 | snd_buf->tail[0].iov_base = tmp; | |
1146 | } | |
00fd6e14 | 1147 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
2d2da60c BF |
1148 | /* RPC_SLACK_SPACE should prevent this ever happening: */ |
1149 | BUG_ON(snd_buf->len > snd_buf->buflen); | |
cca5172a | 1150 | status = -EIO; |
2d2da60c BF |
1151 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1152 | * done anyway, so it's safe to put the request on the wire: */ | |
1153 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1154 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1155 | else if (maj_stat) |
1156 | return status; | |
1157 | ||
1158 | *opaque_len = htonl(snd_buf->len - offset); | |
1159 | /* guess whether we're in the head or the tail: */ | |
1160 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1161 | iov = snd_buf->tail; | |
1162 | else | |
1163 | iov = snd_buf->head; | |
1164 | p = iov->iov_base + iov->iov_len; | |
1165 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1166 | memset(p, 0, pad); | |
1167 | iov->iov_len += pad; | |
1168 | snd_buf->len += pad; | |
1169 | ||
1170 | return 0; | |
1171 | } | |
1172 | ||
1da177e4 LT |
1173 | static int |
1174 | gss_wrap_req(struct rpc_task *task, | |
d8ed029d | 1175 | kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1176 | { |
1177 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1178 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1179 | gc_base); | |
1180 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1181 | int status = -EIO; | |
1182 | ||
8885cb36 | 1183 | dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); |
1da177e4 LT |
1184 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1185 | /* The spec seems a little ambiguous here, but I think that not | |
1186 | * wrapping context destruction requests makes the most sense. | |
1187 | */ | |
be879c4e | 1188 | status = rpc_call_xdrproc(encode, rqstp, p, obj); |
1da177e4 LT |
1189 | goto out; |
1190 | } | |
1191 | switch (gss_cred->gc_service) { | |
1192 | case RPC_GSS_SVC_NONE: | |
be879c4e | 1193 | status = rpc_call_xdrproc(encode, rqstp, p, obj); |
1da177e4 LT |
1194 | break; |
1195 | case RPC_GSS_SVC_INTEGRITY: | |
1196 | status = gss_wrap_req_integ(cred, ctx, encode, | |
1197 | rqstp, p, obj); | |
1198 | break; | |
cca5172a | 1199 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1200 | status = gss_wrap_req_priv(cred, ctx, encode, |
1201 | rqstp, p, obj); | |
1da177e4 LT |
1202 | break; |
1203 | } | |
1204 | out: | |
1205 | gss_put_ctx(ctx); | |
8885cb36 | 1206 | dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); |
1da177e4 LT |
1207 | return status; |
1208 | } | |
1209 | ||
1210 | static inline int | |
1211 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1212 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1213 | { |
1214 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1215 | struct xdr_buf integ_buf; | |
1216 | struct xdr_netobj mic; | |
1217 | u32 data_offset, mic_offset; | |
1218 | u32 integ_len; | |
1219 | u32 maj_stat; | |
1220 | int status = -EIO; | |
1221 | ||
1222 | integ_len = ntohl(*(*p)++); | |
1223 | if (integ_len & 3) | |
1224 | return status; | |
1225 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1226 | mic_offset = integ_len + data_offset; | |
1227 | if (mic_offset > rcv_buf->len) | |
1228 | return status; | |
1229 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1230 | return status; | |
1231 | ||
1232 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1233 | mic_offset - data_offset)) | |
1234 | return status; | |
1235 | ||
1236 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1237 | return status; | |
1238 | ||
00fd6e14 | 1239 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1240 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1241 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1242 | if (maj_stat != GSS_S_COMPLETE) |
1243 | return status; | |
1244 | return 0; | |
1245 | } | |
1246 | ||
2d2da60c BF |
1247 | static inline int |
1248 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1249 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1250 | { |
1251 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1252 | u32 offset; | |
1253 | u32 opaque_len; | |
1254 | u32 maj_stat; | |
1255 | int status = -EIO; | |
1256 | ||
1257 | opaque_len = ntohl(*(*p)++); | |
1258 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1259 | if (offset + opaque_len > rcv_buf->len) | |
1260 | return status; | |
1261 | /* remove padding: */ | |
1262 | rcv_buf->len = offset + opaque_len; | |
1263 | ||
00fd6e14 | 1264 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1265 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1266 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1267 | if (maj_stat != GSS_S_COMPLETE) |
1268 | return status; | |
1269 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1270 | return status; | |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | ||
1da177e4 LT |
1276 | static int |
1277 | gss_unwrap_resp(struct rpc_task *task, | |
d8ed029d | 1278 | kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1279 | { |
1280 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1281 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1282 | gc_base); | |
1283 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1284 | __be32 *savedp = p; |
2d2da60c BF |
1285 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1286 | int savedlen = head->iov_len; | |
1da177e4 LT |
1287 | int status = -EIO; |
1288 | ||
1289 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1290 | goto out_decode; | |
1291 | switch (gss_cred->gc_service) { | |
1292 | case RPC_GSS_SVC_NONE: | |
1293 | break; | |
1294 | case RPC_GSS_SVC_INTEGRITY: | |
1295 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1296 | if (status) | |
1297 | goto out; | |
1298 | break; | |
cca5172a | 1299 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1300 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); |
1301 | if (status) | |
1302 | goto out; | |
1da177e4 LT |
1303 | break; |
1304 | } | |
24b2605b | 1305 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 1306 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 1307 | + (savedlen - head->iov_len); |
1da177e4 | 1308 | out_decode: |
be879c4e | 1309 | status = rpc_call_xdrproc(decode, rqstp, p, obj); |
1da177e4 LT |
1310 | out: |
1311 | gss_put_ctx(ctx); | |
8885cb36 | 1312 | dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, |
1da177e4 LT |
1313 | status); |
1314 | return status; | |
1315 | } | |
cca5172a | 1316 | |
f1c0a861 | 1317 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1318 | .owner = THIS_MODULE, |
1319 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 1320 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
1321 | .create = gss_create, |
1322 | .destroy = gss_destroy, | |
1323 | .lookup_cred = gss_lookup_cred, | |
1324 | .crcreate = gss_create_cred | |
1325 | }; | |
1326 | ||
f1c0a861 | 1327 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1328 | .cr_name = "AUTH_GSS", |
1329 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1330 | .cr_init = gss_cred_init, |
5c691044 | 1331 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
1332 | .crmatch = gss_match, |
1333 | .crmarshal = gss_marshal, | |
1334 | .crrefresh = gss_refresh, | |
1335 | .crvalidate = gss_validate, | |
1336 | .crwrap_req = gss_wrap_req, | |
1337 | .crunwrap_resp = gss_unwrap_resp, | |
1338 | }; | |
1339 | ||
0df7fb74 TM |
1340 | static const struct rpc_credops gss_nullops = { |
1341 | .cr_name = "AUTH_GSS", | |
1342 | .crdestroy = gss_destroy_cred, | |
5c691044 | 1343 | .crbind = rpcauth_generic_bind_cred, |
0df7fb74 TM |
1344 | .crmatch = gss_match, |
1345 | .crmarshal = gss_marshal, | |
1346 | .crrefresh = gss_refresh_null, | |
1347 | .crvalidate = gss_validate, | |
1348 | .crwrap_req = gss_wrap_req, | |
1349 | .crunwrap_resp = gss_unwrap_resp, | |
1350 | }; | |
1351 | ||
1da177e4 LT |
1352 | static struct rpc_pipe_ops gss_upcall_ops = { |
1353 | .upcall = gss_pipe_upcall, | |
1354 | .downcall = gss_pipe_downcall, | |
1355 | .destroy_msg = gss_pipe_destroy_msg, | |
1356 | .release_pipe = gss_pipe_release, | |
1357 | }; | |
1358 | ||
1359 | /* | |
1360 | * Initialize RPCSEC_GSS module | |
1361 | */ | |
1362 | static int __init init_rpcsec_gss(void) | |
1363 | { | |
1364 | int err = 0; | |
1365 | ||
1366 | err = rpcauth_register(&authgss_ops); | |
1367 | if (err) | |
1368 | goto out; | |
1369 | err = gss_svc_init(); | |
1370 | if (err) | |
1371 | goto out_unregister; | |
1372 | return 0; | |
1373 | out_unregister: | |
1374 | rpcauth_unregister(&authgss_ops); | |
1375 | out: | |
1376 | return err; | |
1377 | } | |
1378 | ||
1379 | static void __exit exit_rpcsec_gss(void) | |
1380 | { | |
1381 | gss_svc_shutdown(); | |
1382 | rpcauth_unregister(&authgss_ops); | |
1383 | } | |
1384 | ||
1385 | MODULE_LICENSE("GPL"); | |
1386 | module_init(init_rpcsec_gss) | |
1387 | module_exit(exit_rpcsec_gss) |