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. | |
1da177e4 LT |
36 | */ |
37 | ||
38 | ||
39 | #include <linux/module.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/types.h> | |
42 | #include <linux/slab.h> | |
1da177e4 | 43 | #include <linux/sched.h> |
2d2da60c | 44 | #include <linux/pagemap.h> |
1da177e4 LT |
45 | #include <linux/sunrpc/clnt.h> |
46 | #include <linux/sunrpc/auth.h> | |
47 | #include <linux/sunrpc/auth_gss.h> | |
48 | #include <linux/sunrpc/svcauth_gss.h> | |
49 | #include <linux/sunrpc/gss_err.h> | |
50 | #include <linux/workqueue.h> | |
51 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
52 | #include <linux/sunrpc/gss_api.h> | |
53 | #include <asm/uaccess.h> | |
54 | ||
f1c0a861 | 55 | static const struct rpc_authops authgss_ops; |
1da177e4 | 56 | |
f1c0a861 | 57 | static const struct rpc_credops gss_credops; |
0df7fb74 | 58 | static const struct rpc_credops gss_nullops; |
1da177e4 LT |
59 | |
60 | #ifdef RPC_DEBUG | |
61 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
62 | #endif | |
63 | ||
d25a03cf | 64 | #define GSS_CRED_SLACK 1024 |
1da177e4 LT |
65 | /* length of a krb5 verifier (48), plus data added before arguments when |
66 | * using integrity (two 4-byte integers): */ | |
adeb8133 | 67 | #define GSS_VERF_SLACK 100 |
1da177e4 | 68 | |
1da177e4 | 69 | struct gss_auth { |
0285ed1f | 70 | struct kref kref; |
1da177e4 LT |
71 | struct rpc_auth rpc_auth; |
72 | struct gss_api_mech *mech; | |
73 | enum rpc_gss_svc service; | |
1da177e4 LT |
74 | struct rpc_clnt *client; |
75 | struct dentry *dentry; | |
1da177e4 LT |
76 | }; |
77 | ||
5d28dc82 | 78 | static void gss_free_ctx(struct gss_cl_ctx *); |
1da177e4 LT |
79 | static struct rpc_pipe_ops gss_upcall_ops; |
80 | ||
1da177e4 LT |
81 | static inline struct gss_cl_ctx * |
82 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
83 | { | |
84 | atomic_inc(&ctx->count); | |
85 | return ctx; | |
86 | } | |
87 | ||
88 | static inline void | |
89 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
90 | { | |
91 | if (atomic_dec_and_test(&ctx->count)) | |
5d28dc82 | 92 | gss_free_ctx(ctx); |
1da177e4 LT |
93 | } |
94 | ||
5d28dc82 TM |
95 | /* gss_cred_set_ctx: |
96 | * called by gss_upcall_callback and gss_create_upcall in order | |
97 | * to set the gss context. The actual exchange of an old context | |
98 | * and a new one is protected by the inode->i_lock. | |
99 | */ | |
1da177e4 LT |
100 | static void |
101 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
102 | { | |
103 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
5d28dc82 | 104 | |
cd019f75 TM |
105 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
106 | return; | |
7b6962b0 | 107 | gss_get_ctx(ctx); |
5d28dc82 | 108 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 | 109 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
cd019f75 | 110 | smp_mb__before_clear_bit(); |
fc432dd9 | 111 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
1da177e4 LT |
112 | } |
113 | ||
114 | static const void * | |
115 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
116 | { | |
117 | const void *q = (const void *)((const char *)p + len); | |
118 | if (unlikely(q > end || q < p)) | |
119 | return ERR_PTR(-EFAULT); | |
120 | memcpy(res, p, len); | |
121 | return q; | |
122 | } | |
123 | ||
124 | static inline const void * | |
125 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
126 | { | |
127 | const void *q; | |
128 | unsigned int len; | |
129 | ||
130 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
131 | if (IS_ERR(p)) | |
132 | return p; | |
133 | q = (const void *)((const char *)p + len); | |
134 | if (unlikely(q > end || q < p)) | |
135 | return ERR_PTR(-EFAULT); | |
0f38b873 | 136 | dest->data = kmemdup(p, len, GFP_NOFS); |
1da177e4 LT |
137 | if (unlikely(dest->data == NULL)) |
138 | return ERR_PTR(-ENOMEM); | |
139 | dest->len = len; | |
1da177e4 LT |
140 | return q; |
141 | } | |
142 | ||
143 | static struct gss_cl_ctx * | |
144 | gss_cred_get_ctx(struct rpc_cred *cred) | |
145 | { | |
146 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
147 | struct gss_cl_ctx *ctx = NULL; | |
148 | ||
5d28dc82 | 149 | rcu_read_lock(); |
1da177e4 LT |
150 | if (gss_cred->gc_ctx) |
151 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
5d28dc82 | 152 | rcu_read_unlock(); |
1da177e4 LT |
153 | return ctx; |
154 | } | |
155 | ||
156 | static struct gss_cl_ctx * | |
157 | gss_alloc_context(void) | |
158 | { | |
159 | struct gss_cl_ctx *ctx; | |
160 | ||
0f38b873 | 161 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
1da177e4 | 162 | if (ctx != NULL) { |
1da177e4 LT |
163 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
164 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
165 | spin_lock_init(&ctx->gc_seq_lock); | |
166 | atomic_set(&ctx->count,1); | |
167 | } | |
168 | return ctx; | |
169 | } | |
170 | ||
171 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
172 | static const void * | |
173 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
174 | { | |
175 | const void *q; | |
176 | unsigned int seclen; | |
177 | unsigned int timeout; | |
178 | u32 window_size; | |
179 | int ret; | |
180 | ||
181 | /* First unsigned int gives the lifetime (in seconds) of the cred */ | |
182 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); | |
183 | if (IS_ERR(p)) | |
184 | goto err; | |
185 | if (timeout == 0) | |
186 | timeout = GSSD_MIN_TIMEOUT; | |
187 | ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; | |
188 | /* Sequence number window. Determines the maximum number of simultaneous requests */ | |
189 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); | |
190 | if (IS_ERR(p)) | |
191 | goto err; | |
192 | ctx->gc_win = window_size; | |
193 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
194 | if (ctx->gc_win == 0) { | |
195 | /* in which case, p points to an error code which we ignore */ | |
196 | p = ERR_PTR(-EACCES); | |
197 | goto err; | |
198 | } | |
199 | /* copy the opaque wire context */ | |
200 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
201 | if (IS_ERR(p)) | |
202 | goto err; | |
203 | /* import the opaque security context */ | |
204 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
205 | if (IS_ERR(p)) | |
206 | goto err; | |
207 | q = (const void *)((const char *)p + seclen); | |
208 | if (unlikely(q > end || q < p)) { | |
209 | p = ERR_PTR(-EFAULT); | |
210 | goto err; | |
211 | } | |
212 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); | |
213 | if (ret < 0) { | |
214 | p = ERR_PTR(ret); | |
215 | goto err; | |
216 | } | |
217 | return q; | |
218 | err: | |
8885cb36 | 219 | dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); |
1da177e4 LT |
220 | return p; |
221 | } | |
222 | ||
223 | ||
224 | struct gss_upcall_msg { | |
225 | atomic_t count; | |
226 | uid_t uid; | |
227 | struct rpc_pipe_msg msg; | |
228 | struct list_head list; | |
229 | struct gss_auth *auth; | |
230 | struct rpc_wait_queue rpc_waitqueue; | |
231 | wait_queue_head_t waitqueue; | |
232 | struct gss_cl_ctx *ctx; | |
233 | }; | |
234 | ||
235 | static void | |
236 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
237 | { | |
238 | if (!atomic_dec_and_test(&gss_msg->count)) | |
239 | return; | |
240 | BUG_ON(!list_empty(&gss_msg->list)); | |
241 | if (gss_msg->ctx != NULL) | |
242 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 243 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
1da177e4 LT |
244 | kfree(gss_msg); |
245 | } | |
246 | ||
247 | static struct gss_upcall_msg * | |
6e84c7b6 | 248 | __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) |
1da177e4 LT |
249 | { |
250 | struct gss_upcall_msg *pos; | |
6e84c7b6 | 251 | list_for_each_entry(pos, &rpci->in_downcall, list) { |
1da177e4 LT |
252 | if (pos->uid != uid) |
253 | continue; | |
254 | atomic_inc(&pos->count); | |
8885cb36 | 255 | dprintk("RPC: gss_find_upcall found msg %p\n", pos); |
1da177e4 LT |
256 | return pos; |
257 | } | |
8885cb36 | 258 | dprintk("RPC: gss_find_upcall found nothing\n"); |
1da177e4 LT |
259 | return NULL; |
260 | } | |
261 | ||
720b8f2d | 262 | /* Try to add an upcall to the pipefs queue. |
1da177e4 LT |
263 | * If an upcall owned by our uid already exists, then we return a reference |
264 | * to that upcall instead of adding the new upcall. | |
265 | */ | |
266 | static inline struct gss_upcall_msg * | |
267 | gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) | |
268 | { | |
b185f835 | 269 | struct inode *inode = gss_auth->dentry->d_inode; |
6e84c7b6 | 270 | struct rpc_inode *rpci = RPC_I(inode); |
1da177e4 LT |
271 | struct gss_upcall_msg *old; |
272 | ||
b185f835 | 273 | spin_lock(&inode->i_lock); |
6e84c7b6 | 274 | old = __gss_find_upcall(rpci, gss_msg->uid); |
1da177e4 LT |
275 | if (old == NULL) { |
276 | atomic_inc(&gss_msg->count); | |
6e84c7b6 | 277 | list_add(&gss_msg->list, &rpci->in_downcall); |
1da177e4 LT |
278 | } else |
279 | gss_msg = old; | |
b185f835 | 280 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
281 | return gss_msg; |
282 | } | |
283 | ||
284 | static void | |
285 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
286 | { | |
1da177e4 LT |
287 | list_del_init(&gss_msg->list); |
288 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
289 | wake_up_all(&gss_msg->waitqueue); | |
290 | atomic_dec(&gss_msg->count); | |
291 | } | |
292 | ||
293 | static void | |
294 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
295 | { | |
296 | struct gss_auth *gss_auth = gss_msg->auth; | |
b185f835 | 297 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 | 298 | |
3b68aaea TM |
299 | if (list_empty(&gss_msg->list)) |
300 | return; | |
b185f835 | 301 | spin_lock(&inode->i_lock); |
3b68aaea TM |
302 | if (!list_empty(&gss_msg->list)) |
303 | __gss_unhash_msg(gss_msg); | |
b185f835 | 304 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
305 | } |
306 | ||
307 | static void | |
308 | gss_upcall_callback(struct rpc_task *task) | |
309 | { | |
310 | struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, | |
311 | struct gss_cred, gc_base); | |
312 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
b185f835 | 313 | struct inode *inode = gss_msg->auth->dentry->d_inode; |
1da177e4 | 314 | |
5d28dc82 | 315 | spin_lock(&inode->i_lock); |
1da177e4 | 316 | if (gss_msg->ctx) |
7b6962b0 | 317 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); |
1da177e4 LT |
318 | else |
319 | task->tk_status = gss_msg->msg.errno; | |
1da177e4 LT |
320 | gss_cred->gc_upcall = NULL; |
321 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
b185f835 | 322 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
323 | gss_release_msg(gss_msg); |
324 | } | |
325 | ||
326 | static inline struct gss_upcall_msg * | |
327 | gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) | |
328 | { | |
329 | struct gss_upcall_msg *gss_msg; | |
330 | ||
0f38b873 | 331 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
1da177e4 | 332 | if (gss_msg != NULL) { |
1da177e4 LT |
333 | INIT_LIST_HEAD(&gss_msg->list); |
334 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
335 | init_waitqueue_head(&gss_msg->waitqueue); | |
336 | atomic_set(&gss_msg->count, 1); | |
337 | gss_msg->msg.data = &gss_msg->uid; | |
338 | gss_msg->msg.len = sizeof(gss_msg->uid); | |
339 | gss_msg->uid = uid; | |
340 | gss_msg->auth = gss_auth; | |
341 | } | |
342 | return gss_msg; | |
343 | } | |
344 | ||
345 | static struct gss_upcall_msg * | |
346 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
347 | { | |
7c67db3a TM |
348 | struct gss_cred *gss_cred = container_of(cred, |
349 | struct gss_cred, gc_base); | |
1da177e4 | 350 | struct gss_upcall_msg *gss_new, *gss_msg; |
7c67db3a | 351 | uid_t uid = cred->cr_uid; |
1da177e4 | 352 | |
7c67db3a TM |
353 | /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */ |
354 | if (gss_cred->gc_machine_cred != 0) | |
355 | uid = 0; | |
356 | ||
357 | gss_new = gss_alloc_msg(gss_auth, uid); | |
1da177e4 LT |
358 | if (gss_new == NULL) |
359 | return ERR_PTR(-ENOMEM); | |
360 | gss_msg = gss_add_msg(gss_auth, gss_new); | |
361 | if (gss_msg == gss_new) { | |
362 | int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); | |
363 | if (res) { | |
364 | gss_unhash_msg(gss_new); | |
365 | gss_msg = ERR_PTR(res); | |
366 | } | |
367 | } else | |
368 | gss_release_msg(gss_new); | |
369 | return gss_msg; | |
370 | } | |
371 | ||
372 | static inline int | |
373 | gss_refresh_upcall(struct rpc_task *task) | |
374 | { | |
375 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
4a8c1344 | 376 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
377 | struct gss_auth, rpc_auth); |
378 | struct gss_cred *gss_cred = container_of(cred, | |
379 | struct gss_cred, gc_base); | |
380 | struct gss_upcall_msg *gss_msg; | |
b185f835 | 381 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 LT |
382 | int err = 0; |
383 | ||
8885cb36 CL |
384 | dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, |
385 | cred->cr_uid); | |
1da177e4 LT |
386 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
387 | if (IS_ERR(gss_msg)) { | |
388 | err = PTR_ERR(gss_msg); | |
389 | goto out; | |
390 | } | |
b185f835 | 391 | spin_lock(&inode->i_lock); |
1da177e4 | 392 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 393 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
7b6962b0 TM |
394 | else if (gss_msg->ctx != NULL) { |
395 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); | |
396 | gss_cred->gc_upcall = NULL; | |
397 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
398 | } else if (gss_msg->msg.errno >= 0) { | |
1da177e4 LT |
399 | task->tk_timeout = 0; |
400 | gss_cred->gc_upcall = gss_msg; | |
401 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
402 | atomic_inc(&gss_msg->count); | |
5d00837b | 403 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
1da177e4 LT |
404 | } else |
405 | err = gss_msg->msg.errno; | |
b185f835 | 406 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
407 | gss_release_msg(gss_msg); |
408 | out: | |
8885cb36 CL |
409 | dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", |
410 | task->tk_pid, cred->cr_uid, err); | |
1da177e4 LT |
411 | return err; |
412 | } | |
413 | ||
414 | static inline int | |
415 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
416 | { | |
b185f835 | 417 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 LT |
418 | struct rpc_cred *cred = &gss_cred->gc_base; |
419 | struct gss_upcall_msg *gss_msg; | |
420 | DEFINE_WAIT(wait); | |
421 | int err = 0; | |
422 | ||
8885cb36 | 423 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); |
1da177e4 LT |
424 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
425 | if (IS_ERR(gss_msg)) { | |
426 | err = PTR_ERR(gss_msg); | |
427 | goto out; | |
428 | } | |
429 | for (;;) { | |
430 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); | |
b185f835 | 431 | spin_lock(&inode->i_lock); |
1da177e4 | 432 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
433 | break; |
434 | } | |
b185f835 | 435 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
436 | if (signalled()) { |
437 | err = -ERESTARTSYS; | |
438 | goto out_intr; | |
439 | } | |
440 | schedule(); | |
441 | } | |
442 | if (gss_msg->ctx) | |
7b6962b0 | 443 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
444 | else |
445 | err = gss_msg->msg.errno; | |
5d28dc82 | 446 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
447 | out_intr: |
448 | finish_wait(&gss_msg->waitqueue, &wait); | |
449 | gss_release_msg(gss_msg); | |
450 | out: | |
8885cb36 CL |
451 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", |
452 | cred->cr_uid, err); | |
1da177e4 LT |
453 | return err; |
454 | } | |
455 | ||
456 | static ssize_t | |
457 | gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, | |
458 | char __user *dst, size_t buflen) | |
459 | { | |
460 | char *data = (char *)msg->data + msg->copied; | |
7df08995 CL |
461 | size_t mlen = min(msg->len, buflen); |
462 | unsigned long left; | |
1da177e4 | 463 | |
1da177e4 | 464 | left = copy_to_user(dst, data, mlen); |
7df08995 CL |
465 | if (left == mlen) { |
466 | msg->errno = -EFAULT; | |
467 | return -EFAULT; | |
1da177e4 | 468 | } |
7df08995 | 469 | |
1da177e4 LT |
470 | mlen -= left; |
471 | msg->copied += mlen; | |
472 | msg->errno = 0; | |
473 | return mlen; | |
474 | } | |
475 | ||
476 | #define MSG_BUF_MAXSIZE 1024 | |
477 | ||
478 | static ssize_t | |
479 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
480 | { | |
481 | const void *p, *end; | |
482 | void *buf; | |
1da177e4 | 483 | struct gss_upcall_msg *gss_msg; |
b185f835 | 484 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
485 | struct gss_cl_ctx *ctx; |
486 | uid_t uid; | |
3b68aaea | 487 | ssize_t err = -EFBIG; |
1da177e4 LT |
488 | |
489 | if (mlen > MSG_BUF_MAXSIZE) | |
490 | goto out; | |
491 | err = -ENOMEM; | |
0f38b873 | 492 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
493 | if (!buf) |
494 | goto out; | |
495 | ||
1da177e4 LT |
496 | err = -EFAULT; |
497 | if (copy_from_user(buf, src, mlen)) | |
498 | goto err; | |
499 | ||
500 | end = (const void *)((char *)buf + mlen); | |
501 | p = simple_get_bytes(buf, end, &uid, sizeof(uid)); | |
502 | if (IS_ERR(p)) { | |
503 | err = PTR_ERR(p); | |
504 | goto err; | |
505 | } | |
506 | ||
507 | err = -ENOMEM; | |
508 | ctx = gss_alloc_context(); | |
509 | if (ctx == NULL) | |
510 | goto err; | |
3b68aaea TM |
511 | |
512 | err = -ENOENT; | |
513 | /* Find a matching upcall */ | |
3b68aaea | 514 | spin_lock(&inode->i_lock); |
6e84c7b6 | 515 | gss_msg = __gss_find_upcall(RPC_I(inode), uid); |
3b68aaea TM |
516 | if (gss_msg == NULL) { |
517 | spin_unlock(&inode->i_lock); | |
518 | goto err_put_ctx; | |
519 | } | |
520 | list_del_init(&gss_msg->list); | |
521 | spin_unlock(&inode->i_lock); | |
522 | ||
6e84c7b6 | 523 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
524 | if (IS_ERR(p)) { |
525 | err = PTR_ERR(p); | |
ffc40f56 | 526 | gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES; |
3b68aaea | 527 | goto err_release_msg; |
1da177e4 | 528 | } |
3b68aaea TM |
529 | gss_msg->ctx = gss_get_ctx(ctx); |
530 | err = mlen; | |
531 | ||
532 | err_release_msg: | |
b185f835 | 533 | spin_lock(&inode->i_lock); |
3b68aaea TM |
534 | __gss_unhash_msg(gss_msg); |
535 | spin_unlock(&inode->i_lock); | |
536 | gss_release_msg(gss_msg); | |
1da177e4 LT |
537 | err_put_ctx: |
538 | gss_put_ctx(ctx); | |
539 | err: | |
540 | kfree(buf); | |
541 | out: | |
3b68aaea | 542 | dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); |
1da177e4 LT |
543 | return err; |
544 | } | |
545 | ||
546 | static void | |
547 | gss_pipe_release(struct inode *inode) | |
548 | { | |
549 | struct rpc_inode *rpci = RPC_I(inode); | |
6e84c7b6 | 550 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 551 | |
b185f835 | 552 | spin_lock(&inode->i_lock); |
6e84c7b6 | 553 | while (!list_empty(&rpci->in_downcall)) { |
1da177e4 | 554 | |
6e84c7b6 | 555 | gss_msg = list_entry(rpci->in_downcall.next, |
1da177e4 LT |
556 | struct gss_upcall_msg, list); |
557 | gss_msg->msg.errno = -EPIPE; | |
558 | atomic_inc(&gss_msg->count); | |
559 | __gss_unhash_msg(gss_msg); | |
b185f835 | 560 | spin_unlock(&inode->i_lock); |
1da177e4 | 561 | gss_release_msg(gss_msg); |
b185f835 | 562 | spin_lock(&inode->i_lock); |
1da177e4 | 563 | } |
b185f835 | 564 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
565 | } |
566 | ||
567 | static void | |
568 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
569 | { | |
570 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
571 | static unsigned long ratelimit; | |
572 | ||
573 | if (msg->errno < 0) { | |
8885cb36 | 574 | dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", |
1da177e4 LT |
575 | gss_msg); |
576 | atomic_inc(&gss_msg->count); | |
577 | gss_unhash_msg(gss_msg); | |
48e49187 | 578 | if (msg->errno == -ETIMEDOUT) { |
1da177e4 LT |
579 | unsigned long now = jiffies; |
580 | if (time_after(now, ratelimit)) { | |
581 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" | |
582 | "Please check user daemon is running!\n"); | |
583 | ratelimit = now + 15*HZ; | |
584 | } | |
585 | } | |
586 | gss_release_msg(gss_msg); | |
587 | } | |
588 | } | |
589 | ||
cca5172a YH |
590 | /* |
591 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
592 | * parameters based on the input flavor (which must be a pseudoflavor) |
593 | */ | |
594 | static struct rpc_auth * | |
595 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
596 | { | |
597 | struct gss_auth *gss_auth; | |
598 | struct rpc_auth * auth; | |
6a19275a | 599 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 600 | |
8885cb36 | 601 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
602 | |
603 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 604 | return ERR_PTR(err); |
1da177e4 LT |
605 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
606 | goto out_dec; | |
607 | gss_auth->client = clnt; | |
6a19275a | 608 | err = -EINVAL; |
1da177e4 LT |
609 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
610 | if (!gss_auth->mech) { | |
3392c349 | 611 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", |
0dc47877 | 612 | __func__, flavor); |
1da177e4 LT |
613 | goto err_free; |
614 | } | |
615 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
616 | if (gss_auth->service == 0) |
617 | goto err_put_mech; | |
1da177e4 LT |
618 | auth = &gss_auth->rpc_auth; |
619 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
620 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
621 | auth->au_ops = &authgss_ops; | |
622 | auth->au_flavor = flavor; | |
623 | atomic_set(&auth->au_count, 1); | |
0285ed1f | 624 | kref_init(&gss_auth->kref); |
1da177e4 | 625 | |
158998b6 TM |
626 | gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, |
627 | clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
6a19275a BF |
628 | if (IS_ERR(gss_auth->dentry)) { |
629 | err = PTR_ERR(gss_auth->dentry); | |
1da177e4 | 630 | goto err_put_mech; |
6a19275a | 631 | } |
1da177e4 | 632 | |
f5c2187c | 633 | err = rpcauth_init_credcache(auth); |
07a2bf1d TM |
634 | if (err) |
635 | goto err_unlink_pipe; | |
636 | ||
1da177e4 | 637 | return auth; |
07a2bf1d TM |
638 | err_unlink_pipe: |
639 | rpc_unlink(gss_auth->dentry); | |
1da177e4 LT |
640 | err_put_mech: |
641 | gss_mech_put(gss_auth->mech); | |
642 | err_free: | |
643 | kfree(gss_auth); | |
644 | out_dec: | |
645 | module_put(THIS_MODULE); | |
6a19275a | 646 | return ERR_PTR(err); |
1da177e4 LT |
647 | } |
648 | ||
0285ed1f TM |
649 | static void |
650 | gss_free(struct gss_auth *gss_auth) | |
651 | { | |
652 | rpc_unlink(gss_auth->dentry); | |
0285ed1f TM |
653 | gss_mech_put(gss_auth->mech); |
654 | ||
655 | kfree(gss_auth); | |
656 | module_put(THIS_MODULE); | |
657 | } | |
658 | ||
659 | static void | |
660 | gss_free_callback(struct kref *kref) | |
661 | { | |
662 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
663 | ||
664 | gss_free(gss_auth); | |
665 | } | |
666 | ||
1da177e4 LT |
667 | static void |
668 | gss_destroy(struct rpc_auth *auth) | |
669 | { | |
670 | struct gss_auth *gss_auth; | |
671 | ||
8885cb36 CL |
672 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
673 | auth, auth->au_flavor); | |
1da177e4 | 674 | |
3ab9bb72 TM |
675 | rpcauth_destroy_credcache(auth); |
676 | ||
1da177e4 | 677 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
0285ed1f | 678 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
679 | } |
680 | ||
0df7fb74 TM |
681 | /* |
682 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
683 | * to the server with the GSS control procedure field set to | |
684 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
685 | * all RPCSEC_GSS state associated with that context. | |
686 | */ | |
687 | static int | |
688 | gss_destroying_context(struct rpc_cred *cred) | |
689 | { | |
690 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
691 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
692 | struct rpc_task *task; | |
693 | ||
694 | if (gss_cred->gc_ctx == NULL || | |
6dcd3926 | 695 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
0df7fb74 TM |
696 | return 0; |
697 | ||
698 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
699 | cred->cr_ops = &gss_nullops; | |
700 | ||
701 | /* Take a reference to ensure the cred will be destroyed either | |
702 | * by the RPC call or by the put_rpccred() below */ | |
703 | get_rpccred(cred); | |
704 | ||
080a1f14 | 705 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
0df7fb74 TM |
706 | if (!IS_ERR(task)) |
707 | rpc_put_task(task); | |
708 | ||
709 | put_rpccred(cred); | |
710 | return 1; | |
711 | } | |
712 | ||
713 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
714 | * to create a new cred or context, so they check that things have been |
715 | * allocated before freeing them. */ | |
716 | static void | |
5d28dc82 | 717 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 718 | { |
5d28dc82 | 719 | dprintk("RPC: gss_free_ctx\n"); |
1da177e4 | 720 | |
1da177e4 LT |
721 | kfree(ctx->gc_wire_ctx.data); |
722 | kfree(ctx); | |
723 | } | |
724 | ||
5d28dc82 TM |
725 | static void |
726 | gss_free_ctx_callback(struct rcu_head *head) | |
727 | { | |
728 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
729 | gss_do_free_ctx(ctx); | |
730 | } | |
731 | ||
732 | static void | |
733 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
734 | { | |
a4deb81b TM |
735 | struct gss_ctx *gc_gss_ctx; |
736 | ||
737 | gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); | |
738 | rcu_assign_pointer(ctx->gc_gss_ctx, NULL); | |
5d28dc82 | 739 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); |
a4deb81b TM |
740 | if (gc_gss_ctx) |
741 | gss_delete_sec_context(&gc_gss_ctx); | |
5d28dc82 TM |
742 | } |
743 | ||
1da177e4 | 744 | static void |
31be5bf1 | 745 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 746 | { |
31be5bf1 | 747 | dprintk("RPC: gss_free_cred %p\n", gss_cred); |
31be5bf1 TM |
748 | kfree(gss_cred); |
749 | } | |
1da177e4 | 750 | |
31be5bf1 TM |
751 | static void |
752 | gss_free_cred_callback(struct rcu_head *head) | |
753 | { | |
754 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
755 | gss_free_cred(gss_cred); | |
756 | } | |
1da177e4 | 757 | |
31be5bf1 | 758 | static void |
6dcd3926 | 759 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 760 | { |
5d28dc82 | 761 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 762 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
5d28dc82 TM |
763 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
764 | ||
765 | rcu_assign_pointer(gss_cred->gc_ctx, NULL); | |
31be5bf1 | 766 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
767 | if (ctx) |
768 | gss_put_ctx(ctx); | |
0285ed1f | 769 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
770 | } |
771 | ||
6dcd3926 JL |
772 | static void |
773 | gss_destroy_cred(struct rpc_cred *cred) | |
774 | { | |
775 | ||
776 | if (gss_destroying_context(cred)) | |
777 | return; | |
778 | gss_destroy_nullcred(cred); | |
779 | } | |
780 | ||
1da177e4 LT |
781 | /* |
782 | * Lookup RPCSEC_GSS cred for the current process | |
783 | */ | |
784 | static struct rpc_cred * | |
8a317760 | 785 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 786 | { |
8a317760 | 787 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
788 | } |
789 | ||
790 | static struct rpc_cred * | |
8a317760 | 791 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
792 | { |
793 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
794 | struct gss_cred *cred = NULL; | |
795 | int err = -ENOMEM; | |
796 | ||
8885cb36 | 797 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", |
1da177e4 LT |
798 | acred->uid, auth->au_flavor); |
799 | ||
0f38b873 | 800 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
1da177e4 LT |
801 | goto out_err; |
802 | ||
5fe4755e | 803 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
804 | /* |
805 | * Note: in order to force a call to call_refresh(), we deliberately | |
806 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
807 | */ | |
fc432dd9 | 808 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 809 | cred->gc_service = gss_auth->service; |
7c67db3a | 810 | cred->gc_machine_cred = acred->machine_cred; |
0285ed1f | 811 | kref_get(&gss_auth->kref); |
1da177e4 LT |
812 | return &cred->gc_base; |
813 | ||
814 | out_err: | |
8885cb36 | 815 | dprintk("RPC: gss_create_cred failed with error %d\n", err); |
1da177e4 LT |
816 | return ERR_PTR(err); |
817 | } | |
818 | ||
fba3bad4 TM |
819 | static int |
820 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
821 | { | |
822 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
823 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
824 | int err; | |
825 | ||
826 | do { | |
827 | err = gss_create_upcall(gss_auth, gss_cred); | |
828 | } while (err == -EAGAIN); | |
829 | return err; | |
830 | } | |
831 | ||
1da177e4 | 832 | static int |
8a317760 | 833 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
834 | { |
835 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
836 | ||
cd019f75 | 837 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 838 | goto out; |
1da177e4 | 839 | /* Don't match with creds that have expired. */ |
cd019f75 TM |
840 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
841 | return 0; | |
842 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1da177e4 | 843 | return 0; |
8a317760 | 844 | out: |
7c67db3a TM |
845 | if (acred->machine_cred != gss_cred->gc_machine_cred) |
846 | return 0; | |
1da177e4 LT |
847 | return (rc->cr_uid == acred->uid); |
848 | } | |
849 | ||
850 | /* | |
851 | * Marshal credentials. | |
852 | * Maybe we should keep a cached credential for performance reasons. | |
853 | */ | |
d8ed029d AD |
854 | static __be32 * |
855 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
856 | { |
857 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
858 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
859 | gc_base); | |
860 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 861 | __be32 *cred_len; |
1da177e4 LT |
862 | struct rpc_rqst *req = task->tk_rqstp; |
863 | u32 maj_stat = 0; | |
864 | struct xdr_netobj mic; | |
865 | struct kvec iov; | |
866 | struct xdr_buf verf_buf; | |
867 | ||
8885cb36 | 868 | dprintk("RPC: %5u gss_marshal\n", task->tk_pid); |
1da177e4 LT |
869 | |
870 | *p++ = htonl(RPC_AUTH_GSS); | |
871 | cred_len = p++; | |
872 | ||
873 | spin_lock(&ctx->gc_seq_lock); | |
874 | req->rq_seqno = ctx->gc_seq++; | |
875 | spin_unlock(&ctx->gc_seq_lock); | |
876 | ||
877 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
878 | *p++ = htonl((u32) ctx->gc_proc); | |
879 | *p++ = htonl((u32) req->rq_seqno); | |
880 | *p++ = htonl((u32) gss_cred->gc_service); | |
881 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
882 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
883 | ||
884 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
885 | * starting with the xid and ending at the end of the credential: */ | |
808012fb CL |
886 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
887 | req->rq_snd_buf.head[0].iov_base); | |
1da177e4 LT |
888 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
889 | xdr_buf_from_iov(&iov, &verf_buf); | |
890 | ||
891 | /* set verifier flavor*/ | |
892 | *p++ = htonl(RPC_AUTH_GSS); | |
893 | ||
894 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 895 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 896 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 897 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
898 | } else if (maj_stat != 0) { |
899 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
900 | goto out_put_ctx; | |
901 | } | |
902 | p = xdr_encode_opaque(p, NULL, mic.len); | |
903 | gss_put_ctx(ctx); | |
904 | return p; | |
905 | out_put_ctx: | |
906 | gss_put_ctx(ctx); | |
907 | return NULL; | |
908 | } | |
909 | ||
cd019f75 TM |
910 | static int gss_renew_cred(struct rpc_task *task) |
911 | { | |
912 | struct rpc_cred *oldcred = task->tk_msg.rpc_cred; | |
913 | struct gss_cred *gss_cred = container_of(oldcred, | |
914 | struct gss_cred, | |
915 | gc_base); | |
916 | struct rpc_auth *auth = oldcred->cr_auth; | |
917 | struct auth_cred acred = { | |
918 | .uid = oldcred->cr_uid, | |
919 | .machine_cred = gss_cred->gc_machine_cred, | |
920 | }; | |
921 | struct rpc_cred *new; | |
922 | ||
923 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
924 | if (IS_ERR(new)) | |
925 | return PTR_ERR(new); | |
926 | task->tk_msg.rpc_cred = new; | |
927 | put_rpccred(oldcred); | |
928 | return 0; | |
929 | } | |
930 | ||
1da177e4 LT |
931 | /* |
932 | * Refresh credentials. XXX - finish | |
933 | */ | |
934 | static int | |
935 | gss_refresh(struct rpc_task *task) | |
936 | { | |
cd019f75 TM |
937 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
938 | int ret = 0; | |
939 | ||
940 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && | |
941 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
942 | ret = gss_renew_cred(task); | |
943 | if (ret < 0) | |
944 | goto out; | |
945 | cred = task->tk_msg.rpc_cred; | |
946 | } | |
1da177e4 | 947 | |
cd019f75 TM |
948 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
949 | ret = gss_refresh_upcall(task); | |
950 | out: | |
951 | return ret; | |
1da177e4 LT |
952 | } |
953 | ||
0df7fb74 TM |
954 | /* Dummy refresh routine: used only when destroying the context */ |
955 | static int | |
956 | gss_refresh_null(struct rpc_task *task) | |
957 | { | |
958 | return -EACCES; | |
959 | } | |
960 | ||
d8ed029d AD |
961 | static __be32 * |
962 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
963 | { |
964 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1da177e4 | 965 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 966 | __be32 seq; |
1da177e4 LT |
967 | struct kvec iov; |
968 | struct xdr_buf verf_buf; | |
969 | struct xdr_netobj mic; | |
970 | u32 flav,len; | |
971 | u32 maj_stat; | |
972 | ||
8885cb36 | 973 | dprintk("RPC: %5u gss_validate\n", task->tk_pid); |
1da177e4 LT |
974 | |
975 | flav = ntohl(*p++); | |
976 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 977 | goto out_bad; |
1da177e4 LT |
978 | if (flav != RPC_AUTH_GSS) |
979 | goto out_bad; | |
980 | seq = htonl(task->tk_rqstp->rq_seqno); | |
981 | iov.iov_base = &seq; | |
982 | iov.iov_len = sizeof(seq); | |
983 | xdr_buf_from_iov(&iov, &verf_buf); | |
984 | mic.data = (u8 *)p; | |
985 | mic.len = len; | |
986 | ||
00fd6e14 | 987 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 988 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 989 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 990 | if (maj_stat) { |
014313a9 | 991 | dprintk("RPC: %5u gss_validate: gss_verify_mic returned " |
0df7fb74 | 992 | "error 0x%08x\n", task->tk_pid, maj_stat); |
1da177e4 | 993 | goto out_bad; |
0df7fb74 | 994 | } |
24b2605b BF |
995 | /* We leave it to unwrap to calculate au_rslack. For now we just |
996 | * calculate the length of the verifier: */ | |
1be27f36 | 997 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 998 | gss_put_ctx(ctx); |
8885cb36 | 999 | dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", |
1da177e4 LT |
1000 | task->tk_pid); |
1001 | return p + XDR_QUADLEN(len); | |
1002 | out_bad: | |
1003 | gss_put_ctx(ctx); | |
8885cb36 | 1004 | dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); |
1da177e4 LT |
1005 | return NULL; |
1006 | } | |
1007 | ||
1008 | static inline int | |
1009 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1010 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1011 | { |
1012 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1013 | struct xdr_buf integ_buf; | |
d8ed029d | 1014 | __be32 *integ_len = NULL; |
1da177e4 | 1015 | struct xdr_netobj mic; |
d8ed029d AD |
1016 | u32 offset; |
1017 | __be32 *q; | |
1da177e4 LT |
1018 | struct kvec *iov; |
1019 | u32 maj_stat = 0; | |
1020 | int status = -EIO; | |
1021 | ||
1022 | integ_len = p++; | |
1023 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1024 | *p++ = htonl(rqstp->rq_seqno); | |
1025 | ||
88a9fe8c | 1026 | status = encode(rqstp, p, obj); |
1da177e4 LT |
1027 | if (status) |
1028 | return status; | |
1029 | ||
1030 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1031 | offset, snd_buf->len - offset)) | |
1032 | return status; | |
1033 | *integ_len = htonl(integ_buf.len); | |
1034 | ||
1035 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1036 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1037 | iov = snd_buf->tail; |
1038 | else | |
1039 | iov = snd_buf->head; | |
1040 | p = iov->iov_base + iov->iov_len; | |
1041 | mic.data = (u8 *)(p + 1); | |
1042 | ||
00fd6e14 | 1043 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1044 | status = -EIO; /* XXX? */ |
1045 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1046 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1047 | else if (maj_stat) |
1048 | return status; | |
1049 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1050 | ||
1051 | offset = (u8 *)q - (u8 *)p; | |
1052 | iov->iov_len += offset; | |
1053 | snd_buf->len += offset; | |
1054 | return 0; | |
1055 | } | |
1056 | ||
2d2da60c BF |
1057 | static void |
1058 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1059 | { | |
1060 | int i; | |
1061 | ||
1062 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1063 | __free_page(rqstp->rq_enc_pages[i]); | |
1064 | kfree(rqstp->rq_enc_pages); | |
1065 | } | |
1066 | ||
1067 | static int | |
1068 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1069 | { | |
1070 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1071 | int first, last, i; | |
1072 | ||
1073 | if (snd_buf->page_len == 0) { | |
1074 | rqstp->rq_enc_pages_num = 0; | |
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1079 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1080 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1081 | rqstp->rq_enc_pages | |
1082 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1083 | GFP_NOFS); | |
1084 | if (!rqstp->rq_enc_pages) | |
1085 | goto out; | |
1086 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1087 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1088 | if (rqstp->rq_enc_pages[i] == NULL) | |
1089 | goto out_free; | |
1090 | } | |
1091 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1092 | return 0; | |
1093 | out_free: | |
1094 | for (i--; i >= 0; i--) { | |
1095 | __free_page(rqstp->rq_enc_pages[i]); | |
1096 | } | |
1097 | out: | |
1098 | return -EAGAIN; | |
1099 | } | |
1100 | ||
1101 | static inline int | |
1102 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1103 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
2d2da60c BF |
1104 | { |
1105 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1106 | u32 offset; | |
1107 | u32 maj_stat; | |
1108 | int status; | |
d8ed029d | 1109 | __be32 *opaque_len; |
2d2da60c BF |
1110 | struct page **inpages; |
1111 | int first; | |
1112 | int pad; | |
1113 | struct kvec *iov; | |
1114 | char *tmp; | |
1115 | ||
1116 | opaque_len = p++; | |
1117 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1118 | *p++ = htonl(rqstp->rq_seqno); | |
1119 | ||
88a9fe8c | 1120 | status = encode(rqstp, p, obj); |
2d2da60c BF |
1121 | if (status) |
1122 | return status; | |
1123 | ||
1124 | status = alloc_enc_pages(rqstp); | |
1125 | if (status) | |
1126 | return status; | |
1127 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1128 | inpages = snd_buf->pages + first; | |
1129 | snd_buf->pages = rqstp->rq_enc_pages; | |
1130 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
1131 | /* Give the tail its own page, in case we need extra space in the | |
1132 | * head when wrapping: */ | |
1133 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { | |
1134 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1135 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1136 | snd_buf->tail[0].iov_base = tmp; | |
1137 | } | |
00fd6e14 | 1138 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
2d2da60c BF |
1139 | /* RPC_SLACK_SPACE should prevent this ever happening: */ |
1140 | BUG_ON(snd_buf->len > snd_buf->buflen); | |
cca5172a | 1141 | status = -EIO; |
2d2da60c BF |
1142 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1143 | * done anyway, so it's safe to put the request on the wire: */ | |
1144 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1145 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1146 | else if (maj_stat) |
1147 | return status; | |
1148 | ||
1149 | *opaque_len = htonl(snd_buf->len - offset); | |
1150 | /* guess whether we're in the head or the tail: */ | |
1151 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1152 | iov = snd_buf->tail; | |
1153 | else | |
1154 | iov = snd_buf->head; | |
1155 | p = iov->iov_base + iov->iov_len; | |
1156 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1157 | memset(p, 0, pad); | |
1158 | iov->iov_len += pad; | |
1159 | snd_buf->len += pad; | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
1da177e4 LT |
1164 | static int |
1165 | gss_wrap_req(struct rpc_task *task, | |
d8ed029d | 1166 | kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1167 | { |
1168 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1169 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1170 | gc_base); | |
1171 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1172 | int status = -EIO; | |
1173 | ||
8885cb36 | 1174 | dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); |
1da177e4 LT |
1175 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1176 | /* The spec seems a little ambiguous here, but I think that not | |
1177 | * wrapping context destruction requests makes the most sense. | |
1178 | */ | |
88a9fe8c | 1179 | status = encode(rqstp, p, obj); |
1da177e4 LT |
1180 | goto out; |
1181 | } | |
1182 | switch (gss_cred->gc_service) { | |
1183 | case RPC_GSS_SVC_NONE: | |
88a9fe8c | 1184 | status = encode(rqstp, p, obj); |
1da177e4 LT |
1185 | break; |
1186 | case RPC_GSS_SVC_INTEGRITY: | |
1187 | status = gss_wrap_req_integ(cred, ctx, encode, | |
1188 | rqstp, p, obj); | |
1189 | break; | |
cca5172a | 1190 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1191 | status = gss_wrap_req_priv(cred, ctx, encode, |
1192 | rqstp, p, obj); | |
1da177e4 LT |
1193 | break; |
1194 | } | |
1195 | out: | |
1196 | gss_put_ctx(ctx); | |
8885cb36 | 1197 | dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); |
1da177e4 LT |
1198 | return status; |
1199 | } | |
1200 | ||
1201 | static inline int | |
1202 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1203 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1204 | { |
1205 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1206 | struct xdr_buf integ_buf; | |
1207 | struct xdr_netobj mic; | |
1208 | u32 data_offset, mic_offset; | |
1209 | u32 integ_len; | |
1210 | u32 maj_stat; | |
1211 | int status = -EIO; | |
1212 | ||
1213 | integ_len = ntohl(*(*p)++); | |
1214 | if (integ_len & 3) | |
1215 | return status; | |
1216 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1217 | mic_offset = integ_len + data_offset; | |
1218 | if (mic_offset > rcv_buf->len) | |
1219 | return status; | |
1220 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1221 | return status; | |
1222 | ||
1223 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1224 | mic_offset - data_offset)) | |
1225 | return status; | |
1226 | ||
1227 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1228 | return status; | |
1229 | ||
00fd6e14 | 1230 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1231 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1232 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1233 | if (maj_stat != GSS_S_COMPLETE) |
1234 | return status; | |
1235 | return 0; | |
1236 | } | |
1237 | ||
2d2da60c BF |
1238 | static inline int |
1239 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1240 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1241 | { |
1242 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1243 | u32 offset; | |
1244 | u32 opaque_len; | |
1245 | u32 maj_stat; | |
1246 | int status = -EIO; | |
1247 | ||
1248 | opaque_len = ntohl(*(*p)++); | |
1249 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1250 | if (offset + opaque_len > rcv_buf->len) | |
1251 | return status; | |
1252 | /* remove padding: */ | |
1253 | rcv_buf->len = offset + opaque_len; | |
1254 | ||
00fd6e14 | 1255 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1256 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1257 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1258 | if (maj_stat != GSS_S_COMPLETE) |
1259 | return status; | |
1260 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1261 | return status; | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | ||
1da177e4 LT |
1267 | static int |
1268 | gss_unwrap_resp(struct rpc_task *task, | |
d8ed029d | 1269 | kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1270 | { |
1271 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1272 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1273 | gc_base); | |
1274 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1275 | __be32 *savedp = p; |
2d2da60c BF |
1276 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1277 | int savedlen = head->iov_len; | |
1da177e4 LT |
1278 | int status = -EIO; |
1279 | ||
1280 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1281 | goto out_decode; | |
1282 | switch (gss_cred->gc_service) { | |
1283 | case RPC_GSS_SVC_NONE: | |
1284 | break; | |
1285 | case RPC_GSS_SVC_INTEGRITY: | |
1286 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1287 | if (status) | |
1288 | goto out; | |
1289 | break; | |
cca5172a | 1290 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1291 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); |
1292 | if (status) | |
1293 | goto out; | |
1da177e4 LT |
1294 | break; |
1295 | } | |
24b2605b | 1296 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 1297 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 1298 | + (savedlen - head->iov_len); |
1da177e4 | 1299 | out_decode: |
88a9fe8c | 1300 | status = decode(rqstp, p, obj); |
1da177e4 LT |
1301 | out: |
1302 | gss_put_ctx(ctx); | |
8885cb36 | 1303 | dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, |
1da177e4 LT |
1304 | status); |
1305 | return status; | |
1306 | } | |
cca5172a | 1307 | |
f1c0a861 | 1308 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1309 | .owner = THIS_MODULE, |
1310 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 1311 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
1312 | .create = gss_create, |
1313 | .destroy = gss_destroy, | |
1314 | .lookup_cred = gss_lookup_cred, | |
1315 | .crcreate = gss_create_cred | |
1316 | }; | |
1317 | ||
f1c0a861 | 1318 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1319 | .cr_name = "AUTH_GSS", |
1320 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1321 | .cr_init = gss_cred_init, |
5c691044 | 1322 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
1323 | .crmatch = gss_match, |
1324 | .crmarshal = gss_marshal, | |
1325 | .crrefresh = gss_refresh, | |
1326 | .crvalidate = gss_validate, | |
1327 | .crwrap_req = gss_wrap_req, | |
1328 | .crunwrap_resp = gss_unwrap_resp, | |
1329 | }; | |
1330 | ||
0df7fb74 TM |
1331 | static const struct rpc_credops gss_nullops = { |
1332 | .cr_name = "AUTH_GSS", | |
6dcd3926 | 1333 | .crdestroy = gss_destroy_nullcred, |
5c691044 | 1334 | .crbind = rpcauth_generic_bind_cred, |
0df7fb74 TM |
1335 | .crmatch = gss_match, |
1336 | .crmarshal = gss_marshal, | |
1337 | .crrefresh = gss_refresh_null, | |
1338 | .crvalidate = gss_validate, | |
1339 | .crwrap_req = gss_wrap_req, | |
1340 | .crunwrap_resp = gss_unwrap_resp, | |
1341 | }; | |
1342 | ||
1da177e4 LT |
1343 | static struct rpc_pipe_ops gss_upcall_ops = { |
1344 | .upcall = gss_pipe_upcall, | |
1345 | .downcall = gss_pipe_downcall, | |
1346 | .destroy_msg = gss_pipe_destroy_msg, | |
1347 | .release_pipe = gss_pipe_release, | |
1348 | }; | |
1349 | ||
1350 | /* | |
1351 | * Initialize RPCSEC_GSS module | |
1352 | */ | |
1353 | static int __init init_rpcsec_gss(void) | |
1354 | { | |
1355 | int err = 0; | |
1356 | ||
1357 | err = rpcauth_register(&authgss_ops); | |
1358 | if (err) | |
1359 | goto out; | |
1360 | err = gss_svc_init(); | |
1361 | if (err) | |
1362 | goto out_unregister; | |
1363 | return 0; | |
1364 | out_unregister: | |
1365 | rpcauth_unregister(&authgss_ops); | |
1366 | out: | |
1367 | return err; | |
1368 | } | |
1369 | ||
1370 | static void __exit exit_rpcsec_gss(void) | |
1371 | { | |
1372 | gss_svc_shutdown(); | |
1373 | rpcauth_unregister(&authgss_ops); | |
1374 | } | |
1375 | ||
1376 | MODULE_LICENSE("GPL"); | |
1377 | module_init(init_rpcsec_gss) | |
1378 | module_exit(exit_rpcsec_gss) |