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 | ||
cf81939d BF |
78 | static atomic_t pipe_users = ATOMIC_INIT(0); |
79 | ||
5d28dc82 | 80 | static void gss_free_ctx(struct gss_cl_ctx *); |
1da177e4 LT |
81 | static struct rpc_pipe_ops gss_upcall_ops; |
82 | ||
1da177e4 LT |
83 | static inline struct gss_cl_ctx * |
84 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
85 | { | |
86 | atomic_inc(&ctx->count); | |
87 | return ctx; | |
88 | } | |
89 | ||
90 | static inline void | |
91 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
92 | { | |
93 | if (atomic_dec_and_test(&ctx->count)) | |
5d28dc82 | 94 | gss_free_ctx(ctx); |
1da177e4 LT |
95 | } |
96 | ||
5d28dc82 TM |
97 | /* gss_cred_set_ctx: |
98 | * called by gss_upcall_callback and gss_create_upcall in order | |
99 | * to set the gss context. The actual exchange of an old context | |
100 | * and a new one is protected by the inode->i_lock. | |
101 | */ | |
1da177e4 LT |
102 | static void |
103 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
104 | { | |
105 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
5d28dc82 | 106 | |
cd019f75 TM |
107 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
108 | return; | |
7b6962b0 | 109 | gss_get_ctx(ctx); |
5d28dc82 | 110 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 | 111 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
cd019f75 | 112 | smp_mb__before_clear_bit(); |
fc432dd9 | 113 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
1da177e4 LT |
114 | } |
115 | ||
116 | static const void * | |
117 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
118 | { | |
119 | const void *q = (const void *)((const char *)p + len); | |
120 | if (unlikely(q > end || q < p)) | |
121 | return ERR_PTR(-EFAULT); | |
122 | memcpy(res, p, len); | |
123 | return q; | |
124 | } | |
125 | ||
126 | static inline const void * | |
127 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
128 | { | |
129 | const void *q; | |
130 | unsigned int len; | |
131 | ||
132 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
133 | if (IS_ERR(p)) | |
134 | return p; | |
135 | q = (const void *)((const char *)p + len); | |
136 | if (unlikely(q > end || q < p)) | |
137 | return ERR_PTR(-EFAULT); | |
0f38b873 | 138 | dest->data = kmemdup(p, len, GFP_NOFS); |
1da177e4 LT |
139 | if (unlikely(dest->data == NULL)) |
140 | return ERR_PTR(-ENOMEM); | |
141 | dest->len = len; | |
1da177e4 LT |
142 | return q; |
143 | } | |
144 | ||
145 | static struct gss_cl_ctx * | |
146 | gss_cred_get_ctx(struct rpc_cred *cred) | |
147 | { | |
148 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
149 | struct gss_cl_ctx *ctx = NULL; | |
150 | ||
5d28dc82 | 151 | rcu_read_lock(); |
1da177e4 LT |
152 | if (gss_cred->gc_ctx) |
153 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
5d28dc82 | 154 | rcu_read_unlock(); |
1da177e4 LT |
155 | return ctx; |
156 | } | |
157 | ||
158 | static struct gss_cl_ctx * | |
159 | gss_alloc_context(void) | |
160 | { | |
161 | struct gss_cl_ctx *ctx; | |
162 | ||
0f38b873 | 163 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
1da177e4 | 164 | if (ctx != NULL) { |
1da177e4 LT |
165 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
166 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
167 | spin_lock_init(&ctx->gc_seq_lock); | |
168 | atomic_set(&ctx->count,1); | |
169 | } | |
170 | return ctx; | |
171 | } | |
172 | ||
173 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
174 | static const void * | |
175 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
176 | { | |
177 | const void *q; | |
178 | unsigned int seclen; | |
179 | unsigned int timeout; | |
180 | u32 window_size; | |
181 | int ret; | |
182 | ||
183 | /* First unsigned int gives the lifetime (in seconds) of the cred */ | |
184 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); | |
185 | if (IS_ERR(p)) | |
186 | goto err; | |
187 | if (timeout == 0) | |
188 | timeout = GSSD_MIN_TIMEOUT; | |
189 | ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; | |
190 | /* Sequence number window. Determines the maximum number of simultaneous requests */ | |
191 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); | |
192 | if (IS_ERR(p)) | |
193 | goto err; | |
194 | ctx->gc_win = window_size; | |
195 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
196 | if (ctx->gc_win == 0) { | |
197 | /* in which case, p points to an error code which we ignore */ | |
198 | p = ERR_PTR(-EACCES); | |
199 | goto err; | |
200 | } | |
201 | /* copy the opaque wire context */ | |
202 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
203 | if (IS_ERR(p)) | |
204 | goto err; | |
205 | /* import the opaque security context */ | |
206 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
207 | if (IS_ERR(p)) | |
208 | goto err; | |
209 | q = (const void *)((const char *)p + seclen); | |
210 | if (unlikely(q > end || q < p)) { | |
211 | p = ERR_PTR(-EFAULT); | |
212 | goto err; | |
213 | } | |
214 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); | |
215 | if (ret < 0) { | |
216 | p = ERR_PTR(ret); | |
217 | goto err; | |
218 | } | |
219 | return q; | |
220 | err: | |
8885cb36 | 221 | dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); |
1da177e4 LT |
222 | return p; |
223 | } | |
224 | ||
225 | ||
226 | struct gss_upcall_msg { | |
227 | atomic_t count; | |
228 | uid_t uid; | |
229 | struct rpc_pipe_msg msg; | |
230 | struct list_head list; | |
231 | struct gss_auth *auth; | |
232 | struct rpc_wait_queue rpc_waitqueue; | |
233 | wait_queue_head_t waitqueue; | |
234 | struct gss_cl_ctx *ctx; | |
235 | }; | |
236 | ||
237 | static void | |
238 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
239 | { | |
240 | if (!atomic_dec_and_test(&gss_msg->count)) | |
241 | return; | |
cf81939d | 242 | atomic_dec(&pipe_users); |
1da177e4 LT |
243 | BUG_ON(!list_empty(&gss_msg->list)); |
244 | if (gss_msg->ctx != NULL) | |
245 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 246 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
1da177e4 LT |
247 | kfree(gss_msg); |
248 | } | |
249 | ||
250 | static struct gss_upcall_msg * | |
6e84c7b6 | 251 | __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) |
1da177e4 LT |
252 | { |
253 | struct gss_upcall_msg *pos; | |
6e84c7b6 | 254 | list_for_each_entry(pos, &rpci->in_downcall, list) { |
1da177e4 LT |
255 | if (pos->uid != uid) |
256 | continue; | |
257 | atomic_inc(&pos->count); | |
8885cb36 | 258 | dprintk("RPC: gss_find_upcall found msg %p\n", pos); |
1da177e4 LT |
259 | return pos; |
260 | } | |
8885cb36 | 261 | dprintk("RPC: gss_find_upcall found nothing\n"); |
1da177e4 LT |
262 | return NULL; |
263 | } | |
264 | ||
720b8f2d | 265 | /* Try to add an upcall to the pipefs queue. |
1da177e4 LT |
266 | * If an upcall owned by our uid already exists, then we return a reference |
267 | * to that upcall instead of adding the new upcall. | |
268 | */ | |
269 | static inline struct gss_upcall_msg * | |
270 | gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) | |
271 | { | |
b185f835 | 272 | struct inode *inode = gss_auth->dentry->d_inode; |
6e84c7b6 | 273 | struct rpc_inode *rpci = RPC_I(inode); |
1da177e4 LT |
274 | struct gss_upcall_msg *old; |
275 | ||
b185f835 | 276 | spin_lock(&inode->i_lock); |
6e84c7b6 | 277 | old = __gss_find_upcall(rpci, gss_msg->uid); |
1da177e4 LT |
278 | if (old == NULL) { |
279 | atomic_inc(&gss_msg->count); | |
6e84c7b6 | 280 | list_add(&gss_msg->list, &rpci->in_downcall); |
1da177e4 LT |
281 | } else |
282 | gss_msg = old; | |
b185f835 | 283 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
284 | return gss_msg; |
285 | } | |
286 | ||
287 | static void | |
288 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
289 | { | |
1da177e4 LT |
290 | list_del_init(&gss_msg->list); |
291 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
292 | wake_up_all(&gss_msg->waitqueue); | |
293 | atomic_dec(&gss_msg->count); | |
294 | } | |
295 | ||
296 | static void | |
297 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
298 | { | |
299 | struct gss_auth *gss_auth = gss_msg->auth; | |
b185f835 | 300 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 | 301 | |
3b68aaea TM |
302 | if (list_empty(&gss_msg->list)) |
303 | return; | |
b185f835 | 304 | spin_lock(&inode->i_lock); |
3b68aaea TM |
305 | if (!list_empty(&gss_msg->list)) |
306 | __gss_unhash_msg(gss_msg); | |
b185f835 | 307 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
308 | } |
309 | ||
310 | static void | |
311 | gss_upcall_callback(struct rpc_task *task) | |
312 | { | |
313 | struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, | |
314 | struct gss_cred, gc_base); | |
315 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
b185f835 | 316 | struct inode *inode = gss_msg->auth->dentry->d_inode; |
1da177e4 | 317 | |
5d28dc82 | 318 | spin_lock(&inode->i_lock); |
1da177e4 | 319 | if (gss_msg->ctx) |
7b6962b0 | 320 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); |
1da177e4 LT |
321 | else |
322 | task->tk_status = gss_msg->msg.errno; | |
1da177e4 LT |
323 | gss_cred->gc_upcall = NULL; |
324 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
b185f835 | 325 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
326 | gss_release_msg(gss_msg); |
327 | } | |
328 | ||
329 | static inline struct gss_upcall_msg * | |
330 | gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) | |
331 | { | |
332 | struct gss_upcall_msg *gss_msg; | |
333 | ||
0f38b873 | 334 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
db75b3d6 BF |
335 | if (gss_msg == NULL) |
336 | return ERR_PTR(-ENOMEM); | |
cf81939d | 337 | atomic_inc(&pipe_users); |
db75b3d6 BF |
338 | INIT_LIST_HEAD(&gss_msg->list); |
339 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
340 | init_waitqueue_head(&gss_msg->waitqueue); | |
341 | atomic_set(&gss_msg->count, 1); | |
342 | gss_msg->msg.data = &gss_msg->uid; | |
343 | gss_msg->msg.len = sizeof(gss_msg->uid); | |
344 | gss_msg->uid = uid; | |
345 | gss_msg->auth = gss_auth; | |
1da177e4 LT |
346 | return gss_msg; |
347 | } | |
348 | ||
349 | static struct gss_upcall_msg * | |
350 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
351 | { | |
7c67db3a TM |
352 | struct gss_cred *gss_cred = container_of(cred, |
353 | struct gss_cred, gc_base); | |
1da177e4 | 354 | struct gss_upcall_msg *gss_new, *gss_msg; |
7c67db3a | 355 | uid_t uid = cred->cr_uid; |
1da177e4 | 356 | |
7c67db3a TM |
357 | /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */ |
358 | if (gss_cred->gc_machine_cred != 0) | |
359 | uid = 0; | |
360 | ||
361 | gss_new = gss_alloc_msg(gss_auth, uid); | |
db75b3d6 BF |
362 | if (IS_ERR(gss_new)) |
363 | return gss_new; | |
1da177e4 LT |
364 | gss_msg = gss_add_msg(gss_auth, gss_new); |
365 | if (gss_msg == gss_new) { | |
366 | int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); | |
367 | if (res) { | |
368 | gss_unhash_msg(gss_new); | |
369 | gss_msg = ERR_PTR(res); | |
370 | } | |
371 | } else | |
372 | gss_release_msg(gss_new); | |
373 | return gss_msg; | |
374 | } | |
375 | ||
b03568c3 BF |
376 | static void warn_gssd(void) |
377 | { | |
378 | static unsigned long ratelimit; | |
379 | unsigned long now = jiffies; | |
380 | ||
381 | if (time_after(now, ratelimit)) { | |
382 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" | |
383 | "Please check user daemon is running.\n"); | |
384 | ratelimit = now + 15*HZ; | |
385 | } | |
386 | } | |
387 | ||
1da177e4 LT |
388 | static inline int |
389 | gss_refresh_upcall(struct rpc_task *task) | |
390 | { | |
391 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
4a8c1344 | 392 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
393 | struct gss_auth, rpc_auth); |
394 | struct gss_cred *gss_cred = container_of(cred, | |
395 | struct gss_cred, gc_base); | |
396 | struct gss_upcall_msg *gss_msg; | |
b185f835 | 397 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 LT |
398 | int err = 0; |
399 | ||
8885cb36 CL |
400 | dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, |
401 | cred->cr_uid); | |
1da177e4 LT |
402 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
403 | if (IS_ERR(gss_msg)) { | |
404 | err = PTR_ERR(gss_msg); | |
405 | goto out; | |
406 | } | |
b185f835 | 407 | spin_lock(&inode->i_lock); |
1da177e4 | 408 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 409 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
7b6962b0 TM |
410 | else if (gss_msg->ctx != NULL) { |
411 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); | |
412 | gss_cred->gc_upcall = NULL; | |
413 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
414 | } else if (gss_msg->msg.errno >= 0) { | |
1da177e4 LT |
415 | task->tk_timeout = 0; |
416 | gss_cred->gc_upcall = gss_msg; | |
417 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
418 | atomic_inc(&gss_msg->count); | |
5d00837b | 419 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
1da177e4 LT |
420 | } else |
421 | err = gss_msg->msg.errno; | |
b185f835 | 422 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
423 | gss_release_msg(gss_msg); |
424 | out: | |
8885cb36 CL |
425 | dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", |
426 | task->tk_pid, cred->cr_uid, err); | |
1da177e4 LT |
427 | return err; |
428 | } | |
429 | ||
430 | static inline int | |
431 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
432 | { | |
b185f835 | 433 | struct inode *inode = gss_auth->dentry->d_inode; |
1da177e4 LT |
434 | struct rpc_cred *cred = &gss_cred->gc_base; |
435 | struct gss_upcall_msg *gss_msg; | |
436 | DEFINE_WAIT(wait); | |
437 | int err = 0; | |
438 | ||
8885cb36 | 439 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); |
1da177e4 LT |
440 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
441 | if (IS_ERR(gss_msg)) { | |
442 | err = PTR_ERR(gss_msg); | |
443 | goto out; | |
444 | } | |
445 | for (;;) { | |
446 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); | |
b185f835 | 447 | spin_lock(&inode->i_lock); |
1da177e4 | 448 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
449 | break; |
450 | } | |
b185f835 | 451 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
452 | if (signalled()) { |
453 | err = -ERESTARTSYS; | |
454 | goto out_intr; | |
455 | } | |
456 | schedule(); | |
457 | } | |
458 | if (gss_msg->ctx) | |
7b6962b0 | 459 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
460 | else |
461 | err = gss_msg->msg.errno; | |
5d28dc82 | 462 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
463 | out_intr: |
464 | finish_wait(&gss_msg->waitqueue, &wait); | |
465 | gss_release_msg(gss_msg); | |
466 | out: | |
8885cb36 CL |
467 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", |
468 | cred->cr_uid, err); | |
1da177e4 LT |
469 | return err; |
470 | } | |
471 | ||
472 | static ssize_t | |
473 | gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, | |
474 | char __user *dst, size_t buflen) | |
475 | { | |
476 | char *data = (char *)msg->data + msg->copied; | |
7df08995 CL |
477 | size_t mlen = min(msg->len, buflen); |
478 | unsigned long left; | |
1da177e4 | 479 | |
1da177e4 | 480 | left = copy_to_user(dst, data, mlen); |
7df08995 CL |
481 | if (left == mlen) { |
482 | msg->errno = -EFAULT; | |
483 | return -EFAULT; | |
1da177e4 | 484 | } |
7df08995 | 485 | |
1da177e4 LT |
486 | mlen -= left; |
487 | msg->copied += mlen; | |
488 | msg->errno = 0; | |
489 | return mlen; | |
490 | } | |
491 | ||
492 | #define MSG_BUF_MAXSIZE 1024 | |
493 | ||
494 | static ssize_t | |
495 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
496 | { | |
497 | const void *p, *end; | |
498 | void *buf; | |
1da177e4 | 499 | struct gss_upcall_msg *gss_msg; |
b185f835 | 500 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
501 | struct gss_cl_ctx *ctx; |
502 | uid_t uid; | |
3b68aaea | 503 | ssize_t err = -EFBIG; |
1da177e4 LT |
504 | |
505 | if (mlen > MSG_BUF_MAXSIZE) | |
506 | goto out; | |
507 | err = -ENOMEM; | |
0f38b873 | 508 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
509 | if (!buf) |
510 | goto out; | |
511 | ||
1da177e4 LT |
512 | err = -EFAULT; |
513 | if (copy_from_user(buf, src, mlen)) | |
514 | goto err; | |
515 | ||
516 | end = (const void *)((char *)buf + mlen); | |
517 | p = simple_get_bytes(buf, end, &uid, sizeof(uid)); | |
518 | if (IS_ERR(p)) { | |
519 | err = PTR_ERR(p); | |
520 | goto err; | |
521 | } | |
522 | ||
523 | err = -ENOMEM; | |
524 | ctx = gss_alloc_context(); | |
525 | if (ctx == NULL) | |
526 | goto err; | |
3b68aaea TM |
527 | |
528 | err = -ENOENT; | |
529 | /* Find a matching upcall */ | |
3b68aaea | 530 | spin_lock(&inode->i_lock); |
6e84c7b6 | 531 | gss_msg = __gss_find_upcall(RPC_I(inode), uid); |
3b68aaea TM |
532 | if (gss_msg == NULL) { |
533 | spin_unlock(&inode->i_lock); | |
534 | goto err_put_ctx; | |
535 | } | |
536 | list_del_init(&gss_msg->list); | |
537 | spin_unlock(&inode->i_lock); | |
538 | ||
6e84c7b6 | 539 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
540 | if (IS_ERR(p)) { |
541 | err = PTR_ERR(p); | |
ffc40f56 | 542 | gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES; |
3b68aaea | 543 | goto err_release_msg; |
1da177e4 | 544 | } |
3b68aaea TM |
545 | gss_msg->ctx = gss_get_ctx(ctx); |
546 | err = mlen; | |
547 | ||
548 | err_release_msg: | |
b185f835 | 549 | spin_lock(&inode->i_lock); |
3b68aaea TM |
550 | __gss_unhash_msg(gss_msg); |
551 | spin_unlock(&inode->i_lock); | |
552 | gss_release_msg(gss_msg); | |
1da177e4 LT |
553 | err_put_ctx: |
554 | gss_put_ctx(ctx); | |
555 | err: | |
556 | kfree(buf); | |
557 | out: | |
3b68aaea | 558 | dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); |
1da177e4 LT |
559 | return err; |
560 | } | |
561 | ||
cf81939d BF |
562 | static int |
563 | gss_pipe_open(struct inode *inode) | |
564 | { | |
565 | atomic_inc(&pipe_users); | |
566 | return 0; | |
567 | } | |
568 | ||
1da177e4 LT |
569 | static void |
570 | gss_pipe_release(struct inode *inode) | |
571 | { | |
572 | struct rpc_inode *rpci = RPC_I(inode); | |
6e84c7b6 | 573 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 574 | |
b185f835 | 575 | spin_lock(&inode->i_lock); |
6e84c7b6 | 576 | while (!list_empty(&rpci->in_downcall)) { |
1da177e4 | 577 | |
6e84c7b6 | 578 | gss_msg = list_entry(rpci->in_downcall.next, |
1da177e4 LT |
579 | struct gss_upcall_msg, list); |
580 | gss_msg->msg.errno = -EPIPE; | |
581 | atomic_inc(&gss_msg->count); | |
582 | __gss_unhash_msg(gss_msg); | |
b185f835 | 583 | spin_unlock(&inode->i_lock); |
1da177e4 | 584 | gss_release_msg(gss_msg); |
b185f835 | 585 | spin_lock(&inode->i_lock); |
1da177e4 | 586 | } |
b185f835 | 587 | spin_unlock(&inode->i_lock); |
cf81939d BF |
588 | |
589 | atomic_dec(&pipe_users); | |
1da177e4 LT |
590 | } |
591 | ||
592 | static void | |
593 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
594 | { | |
595 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
1da177e4 LT |
596 | |
597 | if (msg->errno < 0) { | |
8885cb36 | 598 | dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", |
1da177e4 LT |
599 | gss_msg); |
600 | atomic_inc(&gss_msg->count); | |
601 | gss_unhash_msg(gss_msg); | |
b03568c3 BF |
602 | if (msg->errno == -ETIMEDOUT) |
603 | warn_gssd(); | |
1da177e4 LT |
604 | gss_release_msg(gss_msg); |
605 | } | |
606 | } | |
607 | ||
cca5172a YH |
608 | /* |
609 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
610 | * parameters based on the input flavor (which must be a pseudoflavor) |
611 | */ | |
612 | static struct rpc_auth * | |
613 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
614 | { | |
615 | struct gss_auth *gss_auth; | |
616 | struct rpc_auth * auth; | |
6a19275a | 617 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 618 | |
8885cb36 | 619 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
620 | |
621 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 622 | return ERR_PTR(err); |
1da177e4 LT |
623 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
624 | goto out_dec; | |
625 | gss_auth->client = clnt; | |
6a19275a | 626 | err = -EINVAL; |
1da177e4 LT |
627 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
628 | if (!gss_auth->mech) { | |
3392c349 | 629 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", |
0dc47877 | 630 | __func__, flavor); |
1da177e4 LT |
631 | goto err_free; |
632 | } | |
633 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
634 | if (gss_auth->service == 0) |
635 | goto err_put_mech; | |
1da177e4 LT |
636 | auth = &gss_auth->rpc_auth; |
637 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
638 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
639 | auth->au_ops = &authgss_ops; | |
640 | auth->au_flavor = flavor; | |
641 | atomic_set(&auth->au_count, 1); | |
0285ed1f | 642 | kref_init(&gss_auth->kref); |
1da177e4 | 643 | |
158998b6 TM |
644 | gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, |
645 | clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
6a19275a BF |
646 | if (IS_ERR(gss_auth->dentry)) { |
647 | err = PTR_ERR(gss_auth->dentry); | |
1da177e4 | 648 | goto err_put_mech; |
6a19275a | 649 | } |
1da177e4 | 650 | |
f5c2187c | 651 | err = rpcauth_init_credcache(auth); |
07a2bf1d TM |
652 | if (err) |
653 | goto err_unlink_pipe; | |
654 | ||
1da177e4 | 655 | return auth; |
07a2bf1d TM |
656 | err_unlink_pipe: |
657 | rpc_unlink(gss_auth->dentry); | |
1da177e4 LT |
658 | err_put_mech: |
659 | gss_mech_put(gss_auth->mech); | |
660 | err_free: | |
661 | kfree(gss_auth); | |
662 | out_dec: | |
663 | module_put(THIS_MODULE); | |
6a19275a | 664 | return ERR_PTR(err); |
1da177e4 LT |
665 | } |
666 | ||
0285ed1f TM |
667 | static void |
668 | gss_free(struct gss_auth *gss_auth) | |
669 | { | |
670 | rpc_unlink(gss_auth->dentry); | |
0285ed1f TM |
671 | gss_mech_put(gss_auth->mech); |
672 | ||
673 | kfree(gss_auth); | |
674 | module_put(THIS_MODULE); | |
675 | } | |
676 | ||
677 | static void | |
678 | gss_free_callback(struct kref *kref) | |
679 | { | |
680 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
681 | ||
682 | gss_free(gss_auth); | |
683 | } | |
684 | ||
1da177e4 LT |
685 | static void |
686 | gss_destroy(struct rpc_auth *auth) | |
687 | { | |
688 | struct gss_auth *gss_auth; | |
689 | ||
8885cb36 CL |
690 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
691 | auth, auth->au_flavor); | |
1da177e4 | 692 | |
3ab9bb72 TM |
693 | rpcauth_destroy_credcache(auth); |
694 | ||
1da177e4 | 695 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
0285ed1f | 696 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
697 | } |
698 | ||
0df7fb74 TM |
699 | /* |
700 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
701 | * to the server with the GSS control procedure field set to | |
702 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
703 | * all RPCSEC_GSS state associated with that context. | |
704 | */ | |
705 | static int | |
706 | gss_destroying_context(struct rpc_cred *cred) | |
707 | { | |
708 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
709 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
710 | struct rpc_task *task; | |
711 | ||
712 | if (gss_cred->gc_ctx == NULL || | |
6dcd3926 | 713 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
0df7fb74 TM |
714 | return 0; |
715 | ||
716 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
717 | cred->cr_ops = &gss_nullops; | |
718 | ||
719 | /* Take a reference to ensure the cred will be destroyed either | |
720 | * by the RPC call or by the put_rpccred() below */ | |
721 | get_rpccred(cred); | |
722 | ||
080a1f14 | 723 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
0df7fb74 TM |
724 | if (!IS_ERR(task)) |
725 | rpc_put_task(task); | |
726 | ||
727 | put_rpccred(cred); | |
728 | return 1; | |
729 | } | |
730 | ||
731 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
732 | * to create a new cred or context, so they check that things have been |
733 | * allocated before freeing them. */ | |
734 | static void | |
5d28dc82 | 735 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 736 | { |
5d28dc82 | 737 | dprintk("RPC: gss_free_ctx\n"); |
1da177e4 | 738 | |
1da177e4 LT |
739 | kfree(ctx->gc_wire_ctx.data); |
740 | kfree(ctx); | |
741 | } | |
742 | ||
5d28dc82 TM |
743 | static void |
744 | gss_free_ctx_callback(struct rcu_head *head) | |
745 | { | |
746 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
747 | gss_do_free_ctx(ctx); | |
748 | } | |
749 | ||
750 | static void | |
751 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
752 | { | |
a4deb81b TM |
753 | struct gss_ctx *gc_gss_ctx; |
754 | ||
755 | gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); | |
756 | rcu_assign_pointer(ctx->gc_gss_ctx, NULL); | |
5d28dc82 | 757 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); |
a4deb81b TM |
758 | if (gc_gss_ctx) |
759 | gss_delete_sec_context(&gc_gss_ctx); | |
5d28dc82 TM |
760 | } |
761 | ||
1da177e4 | 762 | static void |
31be5bf1 | 763 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 764 | { |
31be5bf1 | 765 | dprintk("RPC: gss_free_cred %p\n", gss_cred); |
31be5bf1 TM |
766 | kfree(gss_cred); |
767 | } | |
1da177e4 | 768 | |
31be5bf1 TM |
769 | static void |
770 | gss_free_cred_callback(struct rcu_head *head) | |
771 | { | |
772 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
773 | gss_free_cred(gss_cred); | |
774 | } | |
1da177e4 | 775 | |
31be5bf1 | 776 | static void |
6dcd3926 | 777 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 778 | { |
5d28dc82 | 779 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 780 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
5d28dc82 TM |
781 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
782 | ||
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 | ||
6dcd3926 JL |
790 | static void |
791 | gss_destroy_cred(struct rpc_cred *cred) | |
792 | { | |
793 | ||
794 | if (gss_destroying_context(cred)) | |
795 | return; | |
796 | gss_destroy_nullcred(cred); | |
797 | } | |
798 | ||
1da177e4 LT |
799 | /* |
800 | * Lookup RPCSEC_GSS cred for the current process | |
801 | */ | |
802 | static struct rpc_cred * | |
8a317760 | 803 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 804 | { |
8a317760 | 805 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
806 | } |
807 | ||
808 | static struct rpc_cred * | |
8a317760 | 809 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
810 | { |
811 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
812 | struct gss_cred *cred = NULL; | |
813 | int err = -ENOMEM; | |
814 | ||
8885cb36 | 815 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", |
1da177e4 LT |
816 | acred->uid, auth->au_flavor); |
817 | ||
0f38b873 | 818 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
1da177e4 LT |
819 | goto out_err; |
820 | ||
5fe4755e | 821 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
822 | /* |
823 | * Note: in order to force a call to call_refresh(), we deliberately | |
824 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
825 | */ | |
fc432dd9 | 826 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 827 | cred->gc_service = gss_auth->service; |
7c67db3a | 828 | cred->gc_machine_cred = acred->machine_cred; |
0285ed1f | 829 | kref_get(&gss_auth->kref); |
1da177e4 LT |
830 | return &cred->gc_base; |
831 | ||
832 | out_err: | |
8885cb36 | 833 | dprintk("RPC: gss_create_cred failed with error %d\n", err); |
1da177e4 LT |
834 | return ERR_PTR(err); |
835 | } | |
836 | ||
fba3bad4 TM |
837 | static int |
838 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
839 | { | |
840 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
841 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
842 | int err; | |
843 | ||
844 | do { | |
845 | err = gss_create_upcall(gss_auth, gss_cred); | |
846 | } while (err == -EAGAIN); | |
847 | return err; | |
848 | } | |
849 | ||
1da177e4 | 850 | static int |
8a317760 | 851 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
852 | { |
853 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
854 | ||
cd019f75 | 855 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 856 | goto out; |
1da177e4 | 857 | /* Don't match with creds that have expired. */ |
cd019f75 TM |
858 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
859 | return 0; | |
860 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1da177e4 | 861 | return 0; |
8a317760 | 862 | out: |
7c67db3a TM |
863 | if (acred->machine_cred != gss_cred->gc_machine_cred) |
864 | return 0; | |
1da177e4 LT |
865 | return (rc->cr_uid == acred->uid); |
866 | } | |
867 | ||
868 | /* | |
869 | * Marshal credentials. | |
870 | * Maybe we should keep a cached credential for performance reasons. | |
871 | */ | |
d8ed029d AD |
872 | static __be32 * |
873 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
874 | { |
875 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
876 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
877 | gc_base); | |
878 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 879 | __be32 *cred_len; |
1da177e4 LT |
880 | struct rpc_rqst *req = task->tk_rqstp; |
881 | u32 maj_stat = 0; | |
882 | struct xdr_netobj mic; | |
883 | struct kvec iov; | |
884 | struct xdr_buf verf_buf; | |
885 | ||
8885cb36 | 886 | dprintk("RPC: %5u gss_marshal\n", task->tk_pid); |
1da177e4 LT |
887 | |
888 | *p++ = htonl(RPC_AUTH_GSS); | |
889 | cred_len = p++; | |
890 | ||
891 | spin_lock(&ctx->gc_seq_lock); | |
892 | req->rq_seqno = ctx->gc_seq++; | |
893 | spin_unlock(&ctx->gc_seq_lock); | |
894 | ||
895 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
896 | *p++ = htonl((u32) ctx->gc_proc); | |
897 | *p++ = htonl((u32) req->rq_seqno); | |
898 | *p++ = htonl((u32) gss_cred->gc_service); | |
899 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
900 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
901 | ||
902 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
903 | * starting with the xid and ending at the end of the credential: */ | |
808012fb CL |
904 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
905 | req->rq_snd_buf.head[0].iov_base); | |
1da177e4 LT |
906 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
907 | xdr_buf_from_iov(&iov, &verf_buf); | |
908 | ||
909 | /* set verifier flavor*/ | |
910 | *p++ = htonl(RPC_AUTH_GSS); | |
911 | ||
912 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 913 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 914 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 915 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
916 | } else if (maj_stat != 0) { |
917 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
918 | goto out_put_ctx; | |
919 | } | |
920 | p = xdr_encode_opaque(p, NULL, mic.len); | |
921 | gss_put_ctx(ctx); | |
922 | return p; | |
923 | out_put_ctx: | |
924 | gss_put_ctx(ctx); | |
925 | return NULL; | |
926 | } | |
927 | ||
cd019f75 TM |
928 | static int gss_renew_cred(struct rpc_task *task) |
929 | { | |
930 | struct rpc_cred *oldcred = task->tk_msg.rpc_cred; | |
931 | struct gss_cred *gss_cred = container_of(oldcred, | |
932 | struct gss_cred, | |
933 | gc_base); | |
934 | struct rpc_auth *auth = oldcred->cr_auth; | |
935 | struct auth_cred acred = { | |
936 | .uid = oldcred->cr_uid, | |
937 | .machine_cred = gss_cred->gc_machine_cred, | |
938 | }; | |
939 | struct rpc_cred *new; | |
940 | ||
941 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
942 | if (IS_ERR(new)) | |
943 | return PTR_ERR(new); | |
944 | task->tk_msg.rpc_cred = new; | |
945 | put_rpccred(oldcred); | |
946 | return 0; | |
947 | } | |
948 | ||
1da177e4 LT |
949 | /* |
950 | * Refresh credentials. XXX - finish | |
951 | */ | |
952 | static int | |
953 | gss_refresh(struct rpc_task *task) | |
954 | { | |
cd019f75 TM |
955 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
956 | int ret = 0; | |
957 | ||
958 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && | |
959 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
960 | ret = gss_renew_cred(task); | |
961 | if (ret < 0) | |
962 | goto out; | |
963 | cred = task->tk_msg.rpc_cred; | |
964 | } | |
1da177e4 | 965 | |
cd019f75 TM |
966 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
967 | ret = gss_refresh_upcall(task); | |
968 | out: | |
969 | return ret; | |
1da177e4 LT |
970 | } |
971 | ||
0df7fb74 TM |
972 | /* Dummy refresh routine: used only when destroying the context */ |
973 | static int | |
974 | gss_refresh_null(struct rpc_task *task) | |
975 | { | |
976 | return -EACCES; | |
977 | } | |
978 | ||
d8ed029d AD |
979 | static __be32 * |
980 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
981 | { |
982 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1da177e4 | 983 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 984 | __be32 seq; |
1da177e4 LT |
985 | struct kvec iov; |
986 | struct xdr_buf verf_buf; | |
987 | struct xdr_netobj mic; | |
988 | u32 flav,len; | |
989 | u32 maj_stat; | |
990 | ||
8885cb36 | 991 | dprintk("RPC: %5u gss_validate\n", task->tk_pid); |
1da177e4 LT |
992 | |
993 | flav = ntohl(*p++); | |
994 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 995 | goto out_bad; |
1da177e4 LT |
996 | if (flav != RPC_AUTH_GSS) |
997 | goto out_bad; | |
998 | seq = htonl(task->tk_rqstp->rq_seqno); | |
999 | iov.iov_base = &seq; | |
1000 | iov.iov_len = sizeof(seq); | |
1001 | xdr_buf_from_iov(&iov, &verf_buf); | |
1002 | mic.data = (u8 *)p; | |
1003 | mic.len = len; | |
1004 | ||
00fd6e14 | 1005 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1006 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1007 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 1008 | if (maj_stat) { |
014313a9 | 1009 | dprintk("RPC: %5u gss_validate: gss_verify_mic returned " |
0df7fb74 | 1010 | "error 0x%08x\n", task->tk_pid, maj_stat); |
1da177e4 | 1011 | goto out_bad; |
0df7fb74 | 1012 | } |
24b2605b BF |
1013 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1014 | * calculate the length of the verifier: */ | |
1be27f36 | 1015 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 1016 | gss_put_ctx(ctx); |
8885cb36 | 1017 | dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", |
1da177e4 LT |
1018 | task->tk_pid); |
1019 | return p + XDR_QUADLEN(len); | |
1020 | out_bad: | |
1021 | gss_put_ctx(ctx); | |
8885cb36 | 1022 | dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); |
1da177e4 LT |
1023 | return NULL; |
1024 | } | |
1025 | ||
1026 | static inline int | |
1027 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1028 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1029 | { |
1030 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1031 | struct xdr_buf integ_buf; | |
d8ed029d | 1032 | __be32 *integ_len = NULL; |
1da177e4 | 1033 | struct xdr_netobj mic; |
d8ed029d AD |
1034 | u32 offset; |
1035 | __be32 *q; | |
1da177e4 LT |
1036 | struct kvec *iov; |
1037 | u32 maj_stat = 0; | |
1038 | int status = -EIO; | |
1039 | ||
1040 | integ_len = p++; | |
1041 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1042 | *p++ = htonl(rqstp->rq_seqno); | |
1043 | ||
88a9fe8c | 1044 | status = encode(rqstp, p, obj); |
1da177e4 LT |
1045 | if (status) |
1046 | return status; | |
1047 | ||
1048 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1049 | offset, snd_buf->len - offset)) | |
1050 | return status; | |
1051 | *integ_len = htonl(integ_buf.len); | |
1052 | ||
1053 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1054 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1055 | iov = snd_buf->tail; |
1056 | else | |
1057 | iov = snd_buf->head; | |
1058 | p = iov->iov_base + iov->iov_len; | |
1059 | mic.data = (u8 *)(p + 1); | |
1060 | ||
00fd6e14 | 1061 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1062 | status = -EIO; /* XXX? */ |
1063 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1064 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1065 | else if (maj_stat) |
1066 | return status; | |
1067 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1068 | ||
1069 | offset = (u8 *)q - (u8 *)p; | |
1070 | iov->iov_len += offset; | |
1071 | snd_buf->len += offset; | |
1072 | return 0; | |
1073 | } | |
1074 | ||
2d2da60c BF |
1075 | static void |
1076 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1077 | { | |
1078 | int i; | |
1079 | ||
1080 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1081 | __free_page(rqstp->rq_enc_pages[i]); | |
1082 | kfree(rqstp->rq_enc_pages); | |
1083 | } | |
1084 | ||
1085 | static int | |
1086 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1087 | { | |
1088 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1089 | int first, last, i; | |
1090 | ||
1091 | if (snd_buf->page_len == 0) { | |
1092 | rqstp->rq_enc_pages_num = 0; | |
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1097 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1098 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1099 | rqstp->rq_enc_pages | |
1100 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1101 | GFP_NOFS); | |
1102 | if (!rqstp->rq_enc_pages) | |
1103 | goto out; | |
1104 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1105 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1106 | if (rqstp->rq_enc_pages[i] == NULL) | |
1107 | goto out_free; | |
1108 | } | |
1109 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1110 | return 0; | |
1111 | out_free: | |
1112 | for (i--; i >= 0; i--) { | |
1113 | __free_page(rqstp->rq_enc_pages[i]); | |
1114 | } | |
1115 | out: | |
1116 | return -EAGAIN; | |
1117 | } | |
1118 | ||
1119 | static inline int | |
1120 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1121 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
2d2da60c BF |
1122 | { |
1123 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1124 | u32 offset; | |
1125 | u32 maj_stat; | |
1126 | int status; | |
d8ed029d | 1127 | __be32 *opaque_len; |
2d2da60c BF |
1128 | struct page **inpages; |
1129 | int first; | |
1130 | int pad; | |
1131 | struct kvec *iov; | |
1132 | char *tmp; | |
1133 | ||
1134 | opaque_len = p++; | |
1135 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1136 | *p++ = htonl(rqstp->rq_seqno); | |
1137 | ||
88a9fe8c | 1138 | status = encode(rqstp, p, obj); |
2d2da60c BF |
1139 | if (status) |
1140 | return status; | |
1141 | ||
1142 | status = alloc_enc_pages(rqstp); | |
1143 | if (status) | |
1144 | return status; | |
1145 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1146 | inpages = snd_buf->pages + first; | |
1147 | snd_buf->pages = rqstp->rq_enc_pages; | |
1148 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
1149 | /* Give the tail its own page, in case we need extra space in the | |
1150 | * head when wrapping: */ | |
1151 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { | |
1152 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1153 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1154 | snd_buf->tail[0].iov_base = tmp; | |
1155 | } | |
00fd6e14 | 1156 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
2d2da60c BF |
1157 | /* RPC_SLACK_SPACE should prevent this ever happening: */ |
1158 | BUG_ON(snd_buf->len > snd_buf->buflen); | |
cca5172a | 1159 | status = -EIO; |
2d2da60c BF |
1160 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1161 | * done anyway, so it's safe to put the request on the wire: */ | |
1162 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1163 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1164 | else if (maj_stat) |
1165 | return status; | |
1166 | ||
1167 | *opaque_len = htonl(snd_buf->len - offset); | |
1168 | /* guess whether we're in the head or the tail: */ | |
1169 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1170 | iov = snd_buf->tail; | |
1171 | else | |
1172 | iov = snd_buf->head; | |
1173 | p = iov->iov_base + iov->iov_len; | |
1174 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1175 | memset(p, 0, pad); | |
1176 | iov->iov_len += pad; | |
1177 | snd_buf->len += pad; | |
1178 | ||
1179 | return 0; | |
1180 | } | |
1181 | ||
1da177e4 LT |
1182 | static int |
1183 | gss_wrap_req(struct rpc_task *task, | |
d8ed029d | 1184 | kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1185 | { |
1186 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1187 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1188 | gc_base); | |
1189 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1190 | int status = -EIO; | |
1191 | ||
8885cb36 | 1192 | dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); |
1da177e4 LT |
1193 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1194 | /* The spec seems a little ambiguous here, but I think that not | |
1195 | * wrapping context destruction requests makes the most sense. | |
1196 | */ | |
88a9fe8c | 1197 | status = encode(rqstp, p, obj); |
1da177e4 LT |
1198 | goto out; |
1199 | } | |
1200 | switch (gss_cred->gc_service) { | |
1201 | case RPC_GSS_SVC_NONE: | |
88a9fe8c | 1202 | status = encode(rqstp, p, obj); |
1da177e4 LT |
1203 | break; |
1204 | case RPC_GSS_SVC_INTEGRITY: | |
1205 | status = gss_wrap_req_integ(cred, ctx, encode, | |
1206 | rqstp, p, obj); | |
1207 | break; | |
cca5172a | 1208 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1209 | status = gss_wrap_req_priv(cred, ctx, encode, |
1210 | rqstp, p, obj); | |
1da177e4 LT |
1211 | break; |
1212 | } | |
1213 | out: | |
1214 | gss_put_ctx(ctx); | |
8885cb36 | 1215 | dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); |
1da177e4 LT |
1216 | return status; |
1217 | } | |
1218 | ||
1219 | static inline int | |
1220 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1221 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1222 | { |
1223 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1224 | struct xdr_buf integ_buf; | |
1225 | struct xdr_netobj mic; | |
1226 | u32 data_offset, mic_offset; | |
1227 | u32 integ_len; | |
1228 | u32 maj_stat; | |
1229 | int status = -EIO; | |
1230 | ||
1231 | integ_len = ntohl(*(*p)++); | |
1232 | if (integ_len & 3) | |
1233 | return status; | |
1234 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1235 | mic_offset = integ_len + data_offset; | |
1236 | if (mic_offset > rcv_buf->len) | |
1237 | return status; | |
1238 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1239 | return status; | |
1240 | ||
1241 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1242 | mic_offset - data_offset)) | |
1243 | return status; | |
1244 | ||
1245 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1246 | return status; | |
1247 | ||
00fd6e14 | 1248 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1249 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1250 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1251 | if (maj_stat != GSS_S_COMPLETE) |
1252 | return status; | |
1253 | return 0; | |
1254 | } | |
1255 | ||
2d2da60c BF |
1256 | static inline int |
1257 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1258 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1259 | { |
1260 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1261 | u32 offset; | |
1262 | u32 opaque_len; | |
1263 | u32 maj_stat; | |
1264 | int status = -EIO; | |
1265 | ||
1266 | opaque_len = ntohl(*(*p)++); | |
1267 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1268 | if (offset + opaque_len > rcv_buf->len) | |
1269 | return status; | |
1270 | /* remove padding: */ | |
1271 | rcv_buf->len = offset + opaque_len; | |
1272 | ||
00fd6e14 | 1273 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1274 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1275 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1276 | if (maj_stat != GSS_S_COMPLETE) |
1277 | return status; | |
1278 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1279 | return status; | |
1280 | ||
1281 | return 0; | |
1282 | } | |
1283 | ||
1284 | ||
1da177e4 LT |
1285 | static int |
1286 | gss_unwrap_resp(struct rpc_task *task, | |
d8ed029d | 1287 | kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1288 | { |
1289 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1290 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1291 | gc_base); | |
1292 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1293 | __be32 *savedp = p; |
2d2da60c BF |
1294 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1295 | int savedlen = head->iov_len; | |
1da177e4 LT |
1296 | int status = -EIO; |
1297 | ||
1298 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1299 | goto out_decode; | |
1300 | switch (gss_cred->gc_service) { | |
1301 | case RPC_GSS_SVC_NONE: | |
1302 | break; | |
1303 | case RPC_GSS_SVC_INTEGRITY: | |
1304 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1305 | if (status) | |
1306 | goto out; | |
1307 | break; | |
cca5172a | 1308 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1309 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); |
1310 | if (status) | |
1311 | goto out; | |
1da177e4 LT |
1312 | break; |
1313 | } | |
24b2605b | 1314 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 1315 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 1316 | + (savedlen - head->iov_len); |
1da177e4 | 1317 | out_decode: |
88a9fe8c | 1318 | status = decode(rqstp, p, obj); |
1da177e4 LT |
1319 | out: |
1320 | gss_put_ctx(ctx); | |
8885cb36 | 1321 | dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, |
1da177e4 LT |
1322 | status); |
1323 | return status; | |
1324 | } | |
cca5172a | 1325 | |
f1c0a861 | 1326 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1327 | .owner = THIS_MODULE, |
1328 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 1329 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
1330 | .create = gss_create, |
1331 | .destroy = gss_destroy, | |
1332 | .lookup_cred = gss_lookup_cred, | |
1333 | .crcreate = gss_create_cred | |
1334 | }; | |
1335 | ||
f1c0a861 | 1336 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1337 | .cr_name = "AUTH_GSS", |
1338 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1339 | .cr_init = gss_cred_init, |
5c691044 | 1340 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
1341 | .crmatch = gss_match, |
1342 | .crmarshal = gss_marshal, | |
1343 | .crrefresh = gss_refresh, | |
1344 | .crvalidate = gss_validate, | |
1345 | .crwrap_req = gss_wrap_req, | |
1346 | .crunwrap_resp = gss_unwrap_resp, | |
1347 | }; | |
1348 | ||
0df7fb74 TM |
1349 | static const struct rpc_credops gss_nullops = { |
1350 | .cr_name = "AUTH_GSS", | |
6dcd3926 | 1351 | .crdestroy = gss_destroy_nullcred, |
5c691044 | 1352 | .crbind = rpcauth_generic_bind_cred, |
0df7fb74 TM |
1353 | .crmatch = gss_match, |
1354 | .crmarshal = gss_marshal, | |
1355 | .crrefresh = gss_refresh_null, | |
1356 | .crvalidate = gss_validate, | |
1357 | .crwrap_req = gss_wrap_req, | |
1358 | .crunwrap_resp = gss_unwrap_resp, | |
1359 | }; | |
1360 | ||
1da177e4 LT |
1361 | static struct rpc_pipe_ops gss_upcall_ops = { |
1362 | .upcall = gss_pipe_upcall, | |
1363 | .downcall = gss_pipe_downcall, | |
1364 | .destroy_msg = gss_pipe_destroy_msg, | |
cf81939d | 1365 | .open_pipe = gss_pipe_open, |
1da177e4 LT |
1366 | .release_pipe = gss_pipe_release, |
1367 | }; | |
1368 | ||
1369 | /* | |
1370 | * Initialize RPCSEC_GSS module | |
1371 | */ | |
1372 | static int __init init_rpcsec_gss(void) | |
1373 | { | |
1374 | int err = 0; | |
1375 | ||
1376 | err = rpcauth_register(&authgss_ops); | |
1377 | if (err) | |
1378 | goto out; | |
1379 | err = gss_svc_init(); | |
1380 | if (err) | |
1381 | goto out_unregister; | |
1382 | return 0; | |
1383 | out_unregister: | |
1384 | rpcauth_unregister(&authgss_ops); | |
1385 | out: | |
1386 | return err; | |
1387 | } | |
1388 | ||
1389 | static void __exit exit_rpcsec_gss(void) | |
1390 | { | |
1391 | gss_svc_shutdown(); | |
1392 | rpcauth_unregister(&authgss_ops); | |
1393 | } | |
1394 | ||
1395 | MODULE_LICENSE("GPL"); | |
1396 | module_init(init_rpcsec_gss) | |
1397 | module_exit(exit_rpcsec_gss) |