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Commit | Line | Data |
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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 | 59 | |
126e216a TM |
60 | #define GSS_RETRY_EXPIRED 5 |
61 | static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; | |
62 | ||
1da177e4 LT |
63 | #ifdef RPC_DEBUG |
64 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
65 | #endif | |
66 | ||
725f2865 | 67 | #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) |
1da177e4 LT |
68 | /* length of a krb5 verifier (48), plus data added before arguments when |
69 | * using integrity (two 4-byte integers): */ | |
adeb8133 | 70 | #define GSS_VERF_SLACK 100 |
1da177e4 | 71 | |
1da177e4 | 72 | struct gss_auth { |
0285ed1f | 73 | struct kref kref; |
1da177e4 LT |
74 | struct rpc_auth rpc_auth; |
75 | struct gss_api_mech *mech; | |
76 | enum rpc_gss_svc service; | |
1da177e4 | 77 | struct rpc_clnt *client; |
34769fc4 BF |
78 | /* |
79 | * There are two upcall pipes; dentry[1], named "gssd", is used | |
80 | * for the new text-based upcall; dentry[0] is named after the | |
81 | * mechanism (for example, "krb5") and exists for | |
82 | * backwards-compatibility with older gssd's. | |
83 | */ | |
c239d83b | 84 | struct rpc_pipe *pipe[2]; |
1da177e4 LT |
85 | }; |
86 | ||
79a3f20b BF |
87 | /* pipe_version >= 0 if and only if someone has a pipe open. */ |
88 | static int pipe_version = -1; | |
cf81939d | 89 | static atomic_t pipe_users = ATOMIC_INIT(0); |
79a3f20b BF |
90 | static DEFINE_SPINLOCK(pipe_version_lock); |
91 | static struct rpc_wait_queue pipe_version_rpc_waitqueue; | |
92 | static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); | |
cf81939d | 93 | |
5d28dc82 | 94 | static void gss_free_ctx(struct gss_cl_ctx *); |
b693ba4a TM |
95 | static const struct rpc_pipe_ops gss_upcall_ops_v0; |
96 | static const struct rpc_pipe_ops gss_upcall_ops_v1; | |
1da177e4 | 97 | |
1da177e4 LT |
98 | static inline struct gss_cl_ctx * |
99 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
100 | { | |
101 | atomic_inc(&ctx->count); | |
102 | return ctx; | |
103 | } | |
104 | ||
105 | static inline void | |
106 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
107 | { | |
108 | if (atomic_dec_and_test(&ctx->count)) | |
5d28dc82 | 109 | gss_free_ctx(ctx); |
1da177e4 LT |
110 | } |
111 | ||
5d28dc82 TM |
112 | /* gss_cred_set_ctx: |
113 | * called by gss_upcall_callback and gss_create_upcall in order | |
114 | * to set the gss context. The actual exchange of an old context | |
9beae467 | 115 | * and a new one is protected by the pipe->lock. |
5d28dc82 | 116 | */ |
1da177e4 LT |
117 | static void |
118 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
119 | { | |
120 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
5d28dc82 | 121 | |
cd019f75 TM |
122 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
123 | return; | |
7b6962b0 | 124 | gss_get_ctx(ctx); |
cf778b00 | 125 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 | 126 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
cd019f75 | 127 | smp_mb__before_clear_bit(); |
fc432dd9 | 128 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
1da177e4 LT |
129 | } |
130 | ||
131 | static const void * | |
132 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
133 | { | |
134 | const void *q = (const void *)((const char *)p + len); | |
135 | if (unlikely(q > end || q < p)) | |
136 | return ERR_PTR(-EFAULT); | |
137 | memcpy(res, p, len); | |
138 | return q; | |
139 | } | |
140 | ||
141 | static inline const void * | |
142 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
143 | { | |
144 | const void *q; | |
145 | unsigned int len; | |
146 | ||
147 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
148 | if (IS_ERR(p)) | |
149 | return p; | |
150 | q = (const void *)((const char *)p + len); | |
151 | if (unlikely(q > end || q < p)) | |
152 | return ERR_PTR(-EFAULT); | |
0f38b873 | 153 | dest->data = kmemdup(p, len, GFP_NOFS); |
1da177e4 LT |
154 | if (unlikely(dest->data == NULL)) |
155 | return ERR_PTR(-ENOMEM); | |
156 | dest->len = len; | |
1da177e4 LT |
157 | return q; |
158 | } | |
159 | ||
160 | static struct gss_cl_ctx * | |
161 | gss_cred_get_ctx(struct rpc_cred *cred) | |
162 | { | |
163 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
164 | struct gss_cl_ctx *ctx = NULL; | |
165 | ||
5d28dc82 | 166 | rcu_read_lock(); |
1da177e4 LT |
167 | if (gss_cred->gc_ctx) |
168 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
5d28dc82 | 169 | rcu_read_unlock(); |
1da177e4 LT |
170 | return ctx; |
171 | } | |
172 | ||
173 | static struct gss_cl_ctx * | |
174 | gss_alloc_context(void) | |
175 | { | |
176 | struct gss_cl_ctx *ctx; | |
177 | ||
0f38b873 | 178 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
1da177e4 | 179 | if (ctx != NULL) { |
1da177e4 LT |
180 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
181 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
182 | spin_lock_init(&ctx->gc_seq_lock); | |
183 | atomic_set(&ctx->count,1); | |
184 | } | |
185 | return ctx; | |
186 | } | |
187 | ||
188 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
189 | static const void * | |
190 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
191 | { | |
192 | const void *q; | |
193 | unsigned int seclen; | |
194 | unsigned int timeout; | |
195 | u32 window_size; | |
196 | int ret; | |
197 | ||
198 | /* First unsigned int gives the lifetime (in seconds) of the cred */ | |
199 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); | |
200 | if (IS_ERR(p)) | |
201 | goto err; | |
202 | if (timeout == 0) | |
203 | timeout = GSSD_MIN_TIMEOUT; | |
204 | ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; | |
205 | /* Sequence number window. Determines the maximum number of simultaneous requests */ | |
206 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); | |
207 | if (IS_ERR(p)) | |
208 | goto err; | |
209 | ctx->gc_win = window_size; | |
210 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
211 | if (ctx->gc_win == 0) { | |
dc5ddce9 JL |
212 | /* |
213 | * in which case, p points to an error code. Anything other | |
214 | * than -EKEYEXPIRED gets converted to -EACCES. | |
215 | */ | |
216 | p = simple_get_bytes(p, end, &ret, sizeof(ret)); | |
217 | if (!IS_ERR(p)) | |
218 | p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : | |
219 | ERR_PTR(-EACCES); | |
1da177e4 LT |
220 | goto err; |
221 | } | |
222 | /* copy the opaque wire context */ | |
223 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
224 | if (IS_ERR(p)) | |
225 | goto err; | |
226 | /* import the opaque security context */ | |
227 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
228 | if (IS_ERR(p)) | |
229 | goto err; | |
230 | q = (const void *)((const char *)p + seclen); | |
231 | if (unlikely(q > end || q < p)) { | |
232 | p = ERR_PTR(-EFAULT); | |
233 | goto err; | |
234 | } | |
1f4c86c0 | 235 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, GFP_NOFS); |
1da177e4 LT |
236 | if (ret < 0) { |
237 | p = ERR_PTR(ret); | |
238 | goto err; | |
239 | } | |
240 | return q; | |
241 | err: | |
8885cb36 | 242 | dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); |
1da177e4 LT |
243 | return p; |
244 | } | |
245 | ||
34769fc4 | 246 | #define UPCALL_BUF_LEN 128 |
1da177e4 LT |
247 | |
248 | struct gss_upcall_msg { | |
249 | atomic_t count; | |
250 | uid_t uid; | |
251 | struct rpc_pipe_msg msg; | |
252 | struct list_head list; | |
253 | struct gss_auth *auth; | |
9beae467 | 254 | struct rpc_pipe *pipe; |
1da177e4 LT |
255 | struct rpc_wait_queue rpc_waitqueue; |
256 | wait_queue_head_t waitqueue; | |
257 | struct gss_cl_ctx *ctx; | |
34769fc4 | 258 | char databuf[UPCALL_BUF_LEN]; |
1da177e4 LT |
259 | }; |
260 | ||
79a3f20b BF |
261 | static int get_pipe_version(void) |
262 | { | |
263 | int ret; | |
264 | ||
265 | spin_lock(&pipe_version_lock); | |
266 | if (pipe_version >= 0) { | |
267 | atomic_inc(&pipe_users); | |
34769fc4 | 268 | ret = pipe_version; |
79a3f20b BF |
269 | } else |
270 | ret = -EAGAIN; | |
271 | spin_unlock(&pipe_version_lock); | |
272 | return ret; | |
273 | } | |
274 | ||
275 | static void put_pipe_version(void) | |
276 | { | |
277 | if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) { | |
278 | pipe_version = -1; | |
279 | spin_unlock(&pipe_version_lock); | |
280 | } | |
281 | } | |
282 | ||
1da177e4 LT |
283 | static void |
284 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
285 | { | |
286 | if (!atomic_dec_and_test(&gss_msg->count)) | |
287 | return; | |
79a3f20b | 288 | put_pipe_version(); |
1da177e4 LT |
289 | BUG_ON(!list_empty(&gss_msg->list)); |
290 | if (gss_msg->ctx != NULL) | |
291 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 292 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
1da177e4 LT |
293 | kfree(gss_msg); |
294 | } | |
295 | ||
296 | static struct gss_upcall_msg * | |
9beae467 | 297 | __gss_find_upcall(struct rpc_pipe *pipe, uid_t uid) |
1da177e4 LT |
298 | { |
299 | struct gss_upcall_msg *pos; | |
9beae467 | 300 | list_for_each_entry(pos, &pipe->in_downcall, list) { |
1da177e4 LT |
301 | if (pos->uid != uid) |
302 | continue; | |
303 | atomic_inc(&pos->count); | |
8885cb36 | 304 | dprintk("RPC: gss_find_upcall found msg %p\n", pos); |
1da177e4 LT |
305 | return pos; |
306 | } | |
8885cb36 | 307 | dprintk("RPC: gss_find_upcall found nothing\n"); |
1da177e4 LT |
308 | return NULL; |
309 | } | |
310 | ||
720b8f2d | 311 | /* Try to add an upcall to the pipefs queue. |
1da177e4 LT |
312 | * If an upcall owned by our uid already exists, then we return a reference |
313 | * to that upcall instead of adding the new upcall. | |
314 | */ | |
315 | static inline struct gss_upcall_msg * | |
053e324f | 316 | gss_add_msg(struct gss_upcall_msg *gss_msg) |
1da177e4 | 317 | { |
9beae467 | 318 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 LT |
319 | struct gss_upcall_msg *old; |
320 | ||
9beae467 SK |
321 | spin_lock(&pipe->lock); |
322 | old = __gss_find_upcall(pipe, gss_msg->uid); | |
1da177e4 LT |
323 | if (old == NULL) { |
324 | atomic_inc(&gss_msg->count); | |
9beae467 | 325 | list_add(&gss_msg->list, &pipe->in_downcall); |
1da177e4 LT |
326 | } else |
327 | gss_msg = old; | |
9beae467 | 328 | spin_unlock(&pipe->lock); |
1da177e4 LT |
329 | return gss_msg; |
330 | } | |
331 | ||
332 | static void | |
333 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
334 | { | |
1da177e4 LT |
335 | list_del_init(&gss_msg->list); |
336 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
337 | wake_up_all(&gss_msg->waitqueue); | |
338 | atomic_dec(&gss_msg->count); | |
339 | } | |
340 | ||
341 | static void | |
342 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
343 | { | |
9beae467 | 344 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 345 | |
3b68aaea TM |
346 | if (list_empty(&gss_msg->list)) |
347 | return; | |
9beae467 | 348 | spin_lock(&pipe->lock); |
3b68aaea TM |
349 | if (!list_empty(&gss_msg->list)) |
350 | __gss_unhash_msg(gss_msg); | |
9beae467 | 351 | spin_unlock(&pipe->lock); |
1da177e4 LT |
352 | } |
353 | ||
126e216a TM |
354 | static void |
355 | gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) | |
356 | { | |
357 | switch (gss_msg->msg.errno) { | |
358 | case 0: | |
359 | if (gss_msg->ctx == NULL) | |
360 | break; | |
361 | clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
362 | gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); | |
363 | break; | |
364 | case -EKEYEXPIRED: | |
365 | set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
366 | } | |
367 | gss_cred->gc_upcall_timestamp = jiffies; | |
368 | gss_cred->gc_upcall = NULL; | |
369 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
370 | } | |
371 | ||
1da177e4 LT |
372 | static void |
373 | gss_upcall_callback(struct rpc_task *task) | |
374 | { | |
a17c2153 | 375 | struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, |
1da177e4 LT |
376 | struct gss_cred, gc_base); |
377 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
9beae467 | 378 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 379 | |
9beae467 | 380 | spin_lock(&pipe->lock); |
126e216a | 381 | gss_handle_downcall_result(gss_cred, gss_msg); |
9beae467 | 382 | spin_unlock(&pipe->lock); |
126e216a | 383 | task->tk_status = gss_msg->msg.errno; |
1da177e4 LT |
384 | gss_release_msg(gss_msg); |
385 | } | |
386 | ||
34769fc4 BF |
387 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) |
388 | { | |
389 | gss_msg->msg.data = &gss_msg->uid; | |
390 | gss_msg->msg.len = sizeof(gss_msg->uid); | |
391 | } | |
392 | ||
8b1c7bf5 | 393 | static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
68c97153 TM |
394 | struct rpc_clnt *clnt, |
395 | const char *service_name) | |
34769fc4 | 396 | { |
683ac665 | 397 | struct gss_api_mech *mech = gss_msg->auth->mech; |
8b1c7bf5 OK |
398 | char *p = gss_msg->databuf; |
399 | int len = 0; | |
400 | ||
401 | gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ", | |
683ac665 | 402 | mech->gm_name, |
34769fc4 | 403 | gss_msg->uid); |
8b1c7bf5 OK |
404 | p += gss_msg->msg.len; |
405 | if (clnt->cl_principal) { | |
406 | len = sprintf(p, "target=%s ", clnt->cl_principal); | |
407 | p += len; | |
408 | gss_msg->msg.len += len; | |
409 | } | |
68c97153 TM |
410 | if (service_name != NULL) { |
411 | len = sprintf(p, "service=%s ", service_name); | |
2efef708 OK |
412 | p += len; |
413 | gss_msg->msg.len += len; | |
414 | } | |
683ac665 | 415 | if (mech->gm_upcall_enctypes) { |
f8628220 | 416 | len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes); |
683ac665 TM |
417 | p += len; |
418 | gss_msg->msg.len += len; | |
419 | } | |
8b1c7bf5 OK |
420 | len = sprintf(p, "\n"); |
421 | gss_msg->msg.len += len; | |
422 | ||
34769fc4 BF |
423 | gss_msg->msg.data = gss_msg->databuf; |
424 | BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN); | |
425 | } | |
426 | ||
8b1c7bf5 | 427 | static void gss_encode_msg(struct gss_upcall_msg *gss_msg, |
68c97153 TM |
428 | struct rpc_clnt *clnt, |
429 | const char *service_name) | |
34769fc4 BF |
430 | { |
431 | if (pipe_version == 0) | |
432 | gss_encode_v0_msg(gss_msg); | |
433 | else /* pipe_version == 1 */ | |
68c97153 | 434 | gss_encode_v1_msg(gss_msg, clnt, service_name); |
34769fc4 BF |
435 | } |
436 | ||
68c97153 TM |
437 | static struct gss_upcall_msg * |
438 | gss_alloc_msg(struct gss_auth *gss_auth, struct rpc_clnt *clnt, | |
439 | uid_t uid, const char *service_name) | |
1da177e4 LT |
440 | { |
441 | struct gss_upcall_msg *gss_msg; | |
79a3f20b | 442 | int vers; |
1da177e4 | 443 | |
0f38b873 | 444 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
db75b3d6 BF |
445 | if (gss_msg == NULL) |
446 | return ERR_PTR(-ENOMEM); | |
79a3f20b BF |
447 | vers = get_pipe_version(); |
448 | if (vers < 0) { | |
449 | kfree(gss_msg); | |
450 | return ERR_PTR(vers); | |
451 | } | |
c239d83b | 452 | gss_msg->pipe = gss_auth->pipe[vers]; |
db75b3d6 BF |
453 | INIT_LIST_HEAD(&gss_msg->list); |
454 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
455 | init_waitqueue_head(&gss_msg->waitqueue); | |
456 | atomic_set(&gss_msg->count, 1); | |
db75b3d6 BF |
457 | gss_msg->uid = uid; |
458 | gss_msg->auth = gss_auth; | |
68c97153 | 459 | gss_encode_msg(gss_msg, clnt, service_name); |
1da177e4 LT |
460 | return gss_msg; |
461 | } | |
462 | ||
463 | static struct gss_upcall_msg * | |
464 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
465 | { | |
7c67db3a TM |
466 | struct gss_cred *gss_cred = container_of(cred, |
467 | struct gss_cred, gc_base); | |
1da177e4 | 468 | struct gss_upcall_msg *gss_new, *gss_msg; |
7c67db3a | 469 | uid_t uid = cred->cr_uid; |
1da177e4 | 470 | |
68c97153 | 471 | gss_new = gss_alloc_msg(gss_auth, clnt, uid, gss_cred->gc_principal); |
db75b3d6 BF |
472 | if (IS_ERR(gss_new)) |
473 | return gss_new; | |
053e324f | 474 | gss_msg = gss_add_msg(gss_new); |
1da177e4 | 475 | if (gss_msg == gss_new) { |
9beae467 | 476 | int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); |
1da177e4 LT |
477 | if (res) { |
478 | gss_unhash_msg(gss_new); | |
479 | gss_msg = ERR_PTR(res); | |
480 | } | |
481 | } else | |
482 | gss_release_msg(gss_new); | |
483 | return gss_msg; | |
484 | } | |
485 | ||
b03568c3 BF |
486 | static void warn_gssd(void) |
487 | { | |
488 | static unsigned long ratelimit; | |
489 | unsigned long now = jiffies; | |
490 | ||
491 | if (time_after(now, ratelimit)) { | |
492 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" | |
493 | "Please check user daemon is running.\n"); | |
494 | ratelimit = now + 15*HZ; | |
495 | } | |
496 | } | |
497 | ||
1da177e4 LT |
498 | static inline int |
499 | gss_refresh_upcall(struct rpc_task *task) | |
500 | { | |
a17c2153 | 501 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
4a8c1344 | 502 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
503 | struct gss_auth, rpc_auth); |
504 | struct gss_cred *gss_cred = container_of(cred, | |
505 | struct gss_cred, gc_base); | |
506 | struct gss_upcall_msg *gss_msg; | |
9beae467 | 507 | struct rpc_pipe *pipe; |
1da177e4 LT |
508 | int err = 0; |
509 | ||
8885cb36 CL |
510 | dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, |
511 | cred->cr_uid); | |
1da177e4 | 512 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
480e3243 | 513 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
79a3f20b BF |
514 | /* XXX: warning on the first, under the assumption we |
515 | * shouldn't normally hit this case on a refresh. */ | |
516 | warn_gssd(); | |
517 | task->tk_timeout = 15*HZ; | |
518 | rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); | |
d1a8016a | 519 | return -EAGAIN; |
79a3f20b | 520 | } |
1da177e4 LT |
521 | if (IS_ERR(gss_msg)) { |
522 | err = PTR_ERR(gss_msg); | |
523 | goto out; | |
524 | } | |
9beae467 SK |
525 | pipe = gss_msg->pipe; |
526 | spin_lock(&pipe->lock); | |
1da177e4 | 527 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 528 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
126e216a | 529 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
1da177e4 LT |
530 | task->tk_timeout = 0; |
531 | gss_cred->gc_upcall = gss_msg; | |
532 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
533 | atomic_inc(&gss_msg->count); | |
5d00837b | 534 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
126e216a TM |
535 | } else { |
536 | gss_handle_downcall_result(gss_cred, gss_msg); | |
1da177e4 | 537 | err = gss_msg->msg.errno; |
126e216a | 538 | } |
9beae467 | 539 | spin_unlock(&pipe->lock); |
1da177e4 LT |
540 | gss_release_msg(gss_msg); |
541 | out: | |
8885cb36 CL |
542 | dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", |
543 | task->tk_pid, cred->cr_uid, err); | |
1da177e4 LT |
544 | return err; |
545 | } | |
546 | ||
547 | static inline int | |
548 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
549 | { | |
9beae467 | 550 | struct rpc_pipe *pipe; |
1da177e4 LT |
551 | struct rpc_cred *cred = &gss_cred->gc_base; |
552 | struct gss_upcall_msg *gss_msg; | |
553 | DEFINE_WAIT(wait); | |
554 | int err = 0; | |
555 | ||
8885cb36 | 556 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); |
79a3f20b | 557 | retry: |
1da177e4 | 558 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
79a3f20b BF |
559 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
560 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, | |
561 | pipe_version >= 0, 15*HZ); | |
d1a8016a BS |
562 | if (pipe_version < 0) { |
563 | warn_gssd(); | |
564 | err = -EACCES; | |
565 | } | |
79a3f20b BF |
566 | if (err) |
567 | goto out; | |
79a3f20b BF |
568 | goto retry; |
569 | } | |
1da177e4 LT |
570 | if (IS_ERR(gss_msg)) { |
571 | err = PTR_ERR(gss_msg); | |
572 | goto out; | |
573 | } | |
9beae467 | 574 | pipe = gss_msg->pipe; |
1da177e4 | 575 | for (;;) { |
5afa9133 | 576 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); |
9beae467 | 577 | spin_lock(&pipe->lock); |
1da177e4 | 578 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
579 | break; |
580 | } | |
9beae467 | 581 | spin_unlock(&pipe->lock); |
5afa9133 | 582 | if (fatal_signal_pending(current)) { |
1da177e4 LT |
583 | err = -ERESTARTSYS; |
584 | goto out_intr; | |
585 | } | |
586 | schedule(); | |
587 | } | |
588 | if (gss_msg->ctx) | |
7b6962b0 | 589 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
590 | else |
591 | err = gss_msg->msg.errno; | |
9beae467 | 592 | spin_unlock(&pipe->lock); |
1da177e4 LT |
593 | out_intr: |
594 | finish_wait(&gss_msg->waitqueue, &wait); | |
595 | gss_release_msg(gss_msg); | |
596 | out: | |
8885cb36 CL |
597 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", |
598 | cred->cr_uid, err); | |
1da177e4 LT |
599 | return err; |
600 | } | |
601 | ||
1da177e4 LT |
602 | #define MSG_BUF_MAXSIZE 1024 |
603 | ||
604 | static ssize_t | |
605 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
606 | { | |
607 | const void *p, *end; | |
608 | void *buf; | |
1da177e4 | 609 | struct gss_upcall_msg *gss_msg; |
9beae467 | 610 | struct rpc_pipe *pipe = RPC_I(filp->f_dentry->d_inode)->pipe; |
1da177e4 LT |
611 | struct gss_cl_ctx *ctx; |
612 | uid_t uid; | |
3b68aaea | 613 | ssize_t err = -EFBIG; |
1da177e4 LT |
614 | |
615 | if (mlen > MSG_BUF_MAXSIZE) | |
616 | goto out; | |
617 | err = -ENOMEM; | |
0f38b873 | 618 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
619 | if (!buf) |
620 | goto out; | |
621 | ||
1da177e4 LT |
622 | err = -EFAULT; |
623 | if (copy_from_user(buf, src, mlen)) | |
624 | goto err; | |
625 | ||
626 | end = (const void *)((char *)buf + mlen); | |
627 | p = simple_get_bytes(buf, end, &uid, sizeof(uid)); | |
628 | if (IS_ERR(p)) { | |
629 | err = PTR_ERR(p); | |
630 | goto err; | |
631 | } | |
632 | ||
633 | err = -ENOMEM; | |
634 | ctx = gss_alloc_context(); | |
635 | if (ctx == NULL) | |
636 | goto err; | |
3b68aaea TM |
637 | |
638 | err = -ENOENT; | |
639 | /* Find a matching upcall */ | |
9beae467 SK |
640 | spin_lock(&pipe->lock); |
641 | gss_msg = __gss_find_upcall(pipe, uid); | |
3b68aaea | 642 | if (gss_msg == NULL) { |
9beae467 | 643 | spin_unlock(&pipe->lock); |
3b68aaea TM |
644 | goto err_put_ctx; |
645 | } | |
646 | list_del_init(&gss_msg->list); | |
9beae467 | 647 | spin_unlock(&pipe->lock); |
3b68aaea | 648 | |
6e84c7b6 | 649 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
650 | if (IS_ERR(p)) { |
651 | err = PTR_ERR(p); | |
486bad2e JL |
652 | switch (err) { |
653 | case -EACCES: | |
dc5ddce9 | 654 | case -EKEYEXPIRED: |
486bad2e JL |
655 | gss_msg->msg.errno = err; |
656 | err = mlen; | |
657 | break; | |
658 | case -EFAULT: | |
659 | case -ENOMEM: | |
660 | case -EINVAL: | |
661 | case -ENOSYS: | |
662 | gss_msg->msg.errno = -EAGAIN; | |
663 | break; | |
664 | default: | |
665 | printk(KERN_CRIT "%s: bad return from " | |
6c853099 | 666 | "gss_fill_context: %zd\n", __func__, err); |
486bad2e JL |
667 | BUG(); |
668 | } | |
3b68aaea | 669 | goto err_release_msg; |
1da177e4 | 670 | } |
3b68aaea TM |
671 | gss_msg->ctx = gss_get_ctx(ctx); |
672 | err = mlen; | |
673 | ||
674 | err_release_msg: | |
9beae467 | 675 | spin_lock(&pipe->lock); |
3b68aaea | 676 | __gss_unhash_msg(gss_msg); |
9beae467 | 677 | spin_unlock(&pipe->lock); |
3b68aaea | 678 | gss_release_msg(gss_msg); |
1da177e4 LT |
679 | err_put_ctx: |
680 | gss_put_ctx(ctx); | |
681 | err: | |
682 | kfree(buf); | |
683 | out: | |
3b68aaea | 684 | dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); |
1da177e4 LT |
685 | return err; |
686 | } | |
687 | ||
34769fc4 | 688 | static int gss_pipe_open(struct inode *inode, int new_version) |
cf81939d | 689 | { |
34769fc4 BF |
690 | int ret = 0; |
691 | ||
79a3f20b BF |
692 | spin_lock(&pipe_version_lock); |
693 | if (pipe_version < 0) { | |
34769fc4 BF |
694 | /* First open of any gss pipe determines the version: */ |
695 | pipe_version = new_version; | |
79a3f20b BF |
696 | rpc_wake_up(&pipe_version_rpc_waitqueue); |
697 | wake_up(&pipe_version_waitqueue); | |
34769fc4 BF |
698 | } else if (pipe_version != new_version) { |
699 | /* Trying to open a pipe of a different version */ | |
700 | ret = -EBUSY; | |
701 | goto out; | |
79a3f20b | 702 | } |
cf81939d | 703 | atomic_inc(&pipe_users); |
34769fc4 | 704 | out: |
79a3f20b | 705 | spin_unlock(&pipe_version_lock); |
34769fc4 BF |
706 | return ret; |
707 | ||
708 | } | |
709 | ||
710 | static int gss_pipe_open_v0(struct inode *inode) | |
711 | { | |
712 | return gss_pipe_open(inode, 0); | |
713 | } | |
714 | ||
715 | static int gss_pipe_open_v1(struct inode *inode) | |
716 | { | |
717 | return gss_pipe_open(inode, 1); | |
cf81939d BF |
718 | } |
719 | ||
1da177e4 LT |
720 | static void |
721 | gss_pipe_release(struct inode *inode) | |
722 | { | |
9beae467 | 723 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
6e84c7b6 | 724 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 725 | |
5a67657a | 726 | restart: |
9beae467 SK |
727 | spin_lock(&pipe->lock); |
728 | list_for_each_entry(gss_msg, &pipe->in_downcall, list) { | |
1da177e4 | 729 | |
5a67657a TM |
730 | if (!list_empty(&gss_msg->msg.list)) |
731 | continue; | |
1da177e4 LT |
732 | gss_msg->msg.errno = -EPIPE; |
733 | atomic_inc(&gss_msg->count); | |
734 | __gss_unhash_msg(gss_msg); | |
9beae467 | 735 | spin_unlock(&pipe->lock); |
1da177e4 | 736 | gss_release_msg(gss_msg); |
5a67657a | 737 | goto restart; |
1da177e4 | 738 | } |
9beae467 | 739 | spin_unlock(&pipe->lock); |
cf81939d | 740 | |
79a3f20b | 741 | put_pipe_version(); |
1da177e4 LT |
742 | } |
743 | ||
744 | static void | |
745 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
746 | { | |
747 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
1da177e4 LT |
748 | |
749 | if (msg->errno < 0) { | |
8885cb36 | 750 | dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", |
1da177e4 LT |
751 | gss_msg); |
752 | atomic_inc(&gss_msg->count); | |
753 | gss_unhash_msg(gss_msg); | |
b03568c3 BF |
754 | if (msg->errno == -ETIMEDOUT) |
755 | warn_gssd(); | |
1da177e4 LT |
756 | gss_release_msg(gss_msg); |
757 | } | |
758 | } | |
759 | ||
ccdc28f8 SK |
760 | static void gss_pipes_dentries_destroy(struct rpc_auth *auth) |
761 | { | |
762 | struct gss_auth *gss_auth; | |
763 | ||
764 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
765 | rpc_unlink(gss_auth->pipe[0]->dentry); | |
766 | rpc_unlink(gss_auth->pipe[1]->dentry); | |
767 | } | |
768 | ||
769 | static int gss_pipes_dentries_create(struct rpc_auth *auth) | |
770 | { | |
771 | int err; | |
772 | struct gss_auth *gss_auth; | |
773 | struct rpc_clnt *clnt; | |
774 | ||
775 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
776 | clnt = gss_auth->client; | |
777 | ||
778 | gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_path.dentry, | |
779 | "gssd", | |
780 | clnt, gss_auth->pipe[1]); | |
781 | if (IS_ERR(gss_auth->pipe[1]->dentry)) | |
782 | return PTR_ERR(gss_auth->pipe[1]->dentry); | |
783 | gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_path.dentry, | |
784 | gss_auth->mech->gm_name, | |
785 | clnt, gss_auth->pipe[0]); | |
786 | if (IS_ERR(gss_auth->pipe[0]->dentry)) { | |
787 | err = PTR_ERR(gss_auth->pipe[0]->dentry); | |
788 | goto err_unlink_pipe_1; | |
789 | } | |
790 | return 0; | |
791 | ||
792 | err_unlink_pipe_1: | |
793 | rpc_unlink(gss_auth->pipe[1]->dentry); | |
794 | return err; | |
795 | } | |
796 | ||
797 | static void gss_pipes_dentries_destroy_net(struct rpc_clnt *clnt, | |
798 | struct rpc_auth *auth) | |
799 | { | |
800 | struct net *net = clnt->cl_xprt->xprt_net; | |
801 | struct super_block *sb; | |
802 | ||
803 | sb = rpc_get_sb_net(net); | |
804 | if (sb) { | |
805 | if (clnt->cl_path.dentry) | |
806 | gss_pipes_dentries_destroy(auth); | |
807 | rpc_put_sb_net(net); | |
808 | } | |
809 | } | |
810 | ||
811 | static int gss_pipes_dentries_create_net(struct rpc_clnt *clnt, | |
812 | struct rpc_auth *auth) | |
813 | { | |
814 | struct net *net = clnt->cl_xprt->xprt_net; | |
815 | struct super_block *sb; | |
816 | int err = 0; | |
817 | ||
818 | sb = rpc_get_sb_net(net); | |
819 | if (sb) { | |
820 | if (clnt->cl_path.dentry) | |
821 | err = gss_pipes_dentries_create(auth); | |
822 | rpc_put_sb_net(net); | |
823 | } | |
824 | return err; | |
825 | } | |
826 | ||
cca5172a YH |
827 | /* |
828 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
829 | * parameters based on the input flavor (which must be a pseudoflavor) |
830 | */ | |
831 | static struct rpc_auth * | |
832 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
833 | { | |
834 | struct gss_auth *gss_auth; | |
835 | struct rpc_auth * auth; | |
6a19275a | 836 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 837 | |
8885cb36 | 838 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
839 | |
840 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 841 | return ERR_PTR(err); |
1da177e4 LT |
842 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
843 | goto out_dec; | |
844 | gss_auth->client = clnt; | |
6a19275a | 845 | err = -EINVAL; |
1da177e4 LT |
846 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
847 | if (!gss_auth->mech) { | |
3392c349 | 848 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", |
0dc47877 | 849 | __func__, flavor); |
1da177e4 LT |
850 | goto err_free; |
851 | } | |
852 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
853 | if (gss_auth->service == 0) |
854 | goto err_put_mech; | |
1da177e4 LT |
855 | auth = &gss_auth->rpc_auth; |
856 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
857 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
858 | auth->au_ops = &authgss_ops; | |
859 | auth->au_flavor = flavor; | |
860 | atomic_set(&auth->au_count, 1); | |
0285ed1f | 861 | kref_init(&gss_auth->kref); |
1da177e4 | 862 | |
34769fc4 BF |
863 | /* |
864 | * Note: if we created the old pipe first, then someone who | |
865 | * examined the directory at the right moment might conclude | |
866 | * that we supported only the old pipe. So we instead create | |
867 | * the new pipe first. | |
868 | */ | |
c239d83b SK |
869 | gss_auth->pipe[1] = rpc_mkpipe_data(&gss_upcall_ops_v1, |
870 | RPC_PIPE_WAIT_FOR_OPEN); | |
871 | if (IS_ERR(gss_auth->pipe[1])) { | |
872 | err = PTR_ERR(gss_auth->pipe[1]); | |
1da177e4 | 873 | goto err_put_mech; |
6a19275a | 874 | } |
1da177e4 | 875 | |
c239d83b SK |
876 | gss_auth->pipe[0] = rpc_mkpipe_data(&gss_upcall_ops_v0, |
877 | RPC_PIPE_WAIT_FOR_OPEN); | |
878 | if (IS_ERR(gss_auth->pipe[0])) { | |
879 | err = PTR_ERR(gss_auth->pipe[0]); | |
880 | goto err_destroy_pipe_1; | |
881 | } | |
ccdc28f8 SK |
882 | err = gss_pipes_dentries_create_net(clnt, auth); |
883 | if (err) | |
c239d83b | 884 | goto err_destroy_pipe_0; |
f5c2187c | 885 | err = rpcauth_init_credcache(auth); |
07a2bf1d | 886 | if (err) |
ccdc28f8 | 887 | goto err_unlink_pipes; |
07a2bf1d | 888 | |
1da177e4 | 889 | return auth; |
ccdc28f8 SK |
890 | err_unlink_pipes: |
891 | gss_pipes_dentries_destroy_net(clnt, auth); | |
c239d83b SK |
892 | err_destroy_pipe_0: |
893 | rpc_destroy_pipe_data(gss_auth->pipe[0]); | |
894 | err_destroy_pipe_1: | |
895 | rpc_destroy_pipe_data(gss_auth->pipe[1]); | |
1da177e4 LT |
896 | err_put_mech: |
897 | gss_mech_put(gss_auth->mech); | |
898 | err_free: | |
899 | kfree(gss_auth); | |
900 | out_dec: | |
901 | module_put(THIS_MODULE); | |
6a19275a | 902 | return ERR_PTR(err); |
1da177e4 LT |
903 | } |
904 | ||
0285ed1f TM |
905 | static void |
906 | gss_free(struct gss_auth *gss_auth) | |
907 | { | |
ccdc28f8 | 908 | gss_pipes_dentries_destroy_net(gss_auth->client, &gss_auth->rpc_auth); |
c239d83b SK |
909 | rpc_destroy_pipe_data(gss_auth->pipe[0]); |
910 | rpc_destroy_pipe_data(gss_auth->pipe[1]); | |
0285ed1f TM |
911 | gss_mech_put(gss_auth->mech); |
912 | ||
913 | kfree(gss_auth); | |
914 | module_put(THIS_MODULE); | |
915 | } | |
916 | ||
917 | static void | |
918 | gss_free_callback(struct kref *kref) | |
919 | { | |
920 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
921 | ||
922 | gss_free(gss_auth); | |
923 | } | |
924 | ||
1da177e4 LT |
925 | static void |
926 | gss_destroy(struct rpc_auth *auth) | |
927 | { | |
928 | struct gss_auth *gss_auth; | |
929 | ||
8885cb36 CL |
930 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
931 | auth, auth->au_flavor); | |
1da177e4 | 932 | |
3ab9bb72 TM |
933 | rpcauth_destroy_credcache(auth); |
934 | ||
1da177e4 | 935 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
0285ed1f | 936 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
937 | } |
938 | ||
0df7fb74 TM |
939 | /* |
940 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
941 | * to the server with the GSS control procedure field set to | |
942 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
943 | * all RPCSEC_GSS state associated with that context. | |
944 | */ | |
945 | static int | |
946 | gss_destroying_context(struct rpc_cred *cred) | |
947 | { | |
948 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
949 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
950 | struct rpc_task *task; | |
951 | ||
952 | if (gss_cred->gc_ctx == NULL || | |
6dcd3926 | 953 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
0df7fb74 TM |
954 | return 0; |
955 | ||
956 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
957 | cred->cr_ops = &gss_nullops; | |
958 | ||
959 | /* Take a reference to ensure the cred will be destroyed either | |
960 | * by the RPC call or by the put_rpccred() below */ | |
961 | get_rpccred(cred); | |
962 | ||
080a1f14 | 963 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
0df7fb74 TM |
964 | if (!IS_ERR(task)) |
965 | rpc_put_task(task); | |
966 | ||
967 | put_rpccred(cred); | |
968 | return 1; | |
969 | } | |
970 | ||
971 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
972 | * to create a new cred or context, so they check that things have been |
973 | * allocated before freeing them. */ | |
974 | static void | |
5d28dc82 | 975 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 976 | { |
5d28dc82 | 977 | dprintk("RPC: gss_free_ctx\n"); |
1da177e4 | 978 | |
0d8a3746 | 979 | gss_delete_sec_context(&ctx->gc_gss_ctx); |
1da177e4 LT |
980 | kfree(ctx->gc_wire_ctx.data); |
981 | kfree(ctx); | |
982 | } | |
983 | ||
5d28dc82 TM |
984 | static void |
985 | gss_free_ctx_callback(struct rcu_head *head) | |
986 | { | |
987 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
988 | gss_do_free_ctx(ctx); | |
989 | } | |
990 | ||
991 | static void | |
992 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
993 | { | |
994 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); | |
995 | } | |
996 | ||
1da177e4 | 997 | static void |
31be5bf1 | 998 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 999 | { |
31be5bf1 | 1000 | dprintk("RPC: gss_free_cred %p\n", gss_cred); |
31be5bf1 TM |
1001 | kfree(gss_cred); |
1002 | } | |
1da177e4 | 1003 | |
31be5bf1 TM |
1004 | static void |
1005 | gss_free_cred_callback(struct rcu_head *head) | |
1006 | { | |
1007 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
1008 | gss_free_cred(gss_cred); | |
1009 | } | |
1da177e4 | 1010 | |
31be5bf1 | 1011 | static void |
6dcd3926 | 1012 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 1013 | { |
5d28dc82 | 1014 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 1015 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
5d28dc82 TM |
1016 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
1017 | ||
a9b3cd7f | 1018 | RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); |
31be5bf1 | 1019 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
1020 | if (ctx) |
1021 | gss_put_ctx(ctx); | |
0285ed1f | 1022 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
1023 | } |
1024 | ||
6dcd3926 JL |
1025 | static void |
1026 | gss_destroy_cred(struct rpc_cred *cred) | |
1027 | { | |
1028 | ||
1029 | if (gss_destroying_context(cred)) | |
1030 | return; | |
1031 | gss_destroy_nullcred(cred); | |
1032 | } | |
1033 | ||
1da177e4 LT |
1034 | /* |
1035 | * Lookup RPCSEC_GSS cred for the current process | |
1036 | */ | |
1037 | static struct rpc_cred * | |
8a317760 | 1038 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 1039 | { |
8a317760 | 1040 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
1041 | } |
1042 | ||
1043 | static struct rpc_cred * | |
8a317760 | 1044 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
1045 | { |
1046 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1047 | struct gss_cred *cred = NULL; | |
1048 | int err = -ENOMEM; | |
1049 | ||
8885cb36 | 1050 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", |
1da177e4 LT |
1051 | acred->uid, auth->au_flavor); |
1052 | ||
0f38b873 | 1053 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
1da177e4 LT |
1054 | goto out_err; |
1055 | ||
5fe4755e | 1056 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
1057 | /* |
1058 | * Note: in order to force a call to call_refresh(), we deliberately | |
1059 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
1060 | */ | |
fc432dd9 | 1061 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 1062 | cred->gc_service = gss_auth->service; |
68c97153 TM |
1063 | cred->gc_principal = NULL; |
1064 | if (acred->machine_cred) | |
1065 | cred->gc_principal = acred->principal; | |
0285ed1f | 1066 | kref_get(&gss_auth->kref); |
1da177e4 LT |
1067 | return &cred->gc_base; |
1068 | ||
1069 | out_err: | |
8885cb36 | 1070 | dprintk("RPC: gss_create_cred failed with error %d\n", err); |
1da177e4 LT |
1071 | return ERR_PTR(err); |
1072 | } | |
1073 | ||
fba3bad4 TM |
1074 | static int |
1075 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
1076 | { | |
1077 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1078 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
1079 | int err; | |
1080 | ||
1081 | do { | |
1082 | err = gss_create_upcall(gss_auth, gss_cred); | |
1083 | } while (err == -EAGAIN); | |
1084 | return err; | |
1085 | } | |
1086 | ||
1da177e4 | 1087 | static int |
8a317760 | 1088 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
1089 | { |
1090 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
1091 | ||
cd019f75 | 1092 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 1093 | goto out; |
1da177e4 | 1094 | /* Don't match with creds that have expired. */ |
cd019f75 TM |
1095 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
1096 | return 0; | |
1097 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1da177e4 | 1098 | return 0; |
8a317760 | 1099 | out: |
68c97153 TM |
1100 | if (acred->principal != NULL) { |
1101 | if (gss_cred->gc_principal == NULL) | |
1102 | return 0; | |
1103 | return strcmp(acred->principal, gss_cred->gc_principal) == 0; | |
1104 | } | |
1105 | if (gss_cred->gc_principal != NULL) | |
7c67db3a | 1106 | return 0; |
a02cec21 | 1107 | return rc->cr_uid == acred->uid; |
1da177e4 LT |
1108 | } |
1109 | ||
1110 | /* | |
1111 | * Marshal credentials. | |
1112 | * Maybe we should keep a cached credential for performance reasons. | |
1113 | */ | |
d8ed029d AD |
1114 | static __be32 * |
1115 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1116 | { |
a17c2153 TM |
1117 | struct rpc_rqst *req = task->tk_rqstp; |
1118 | struct rpc_cred *cred = req->rq_cred; | |
1da177e4 LT |
1119 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1120 | gc_base); | |
1121 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1122 | __be32 *cred_len; |
1da177e4 LT |
1123 | u32 maj_stat = 0; |
1124 | struct xdr_netobj mic; | |
1125 | struct kvec iov; | |
1126 | struct xdr_buf verf_buf; | |
1127 | ||
8885cb36 | 1128 | dprintk("RPC: %5u gss_marshal\n", task->tk_pid); |
1da177e4 LT |
1129 | |
1130 | *p++ = htonl(RPC_AUTH_GSS); | |
1131 | cred_len = p++; | |
1132 | ||
1133 | spin_lock(&ctx->gc_seq_lock); | |
1134 | req->rq_seqno = ctx->gc_seq++; | |
1135 | spin_unlock(&ctx->gc_seq_lock); | |
1136 | ||
1137 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
1138 | *p++ = htonl((u32) ctx->gc_proc); | |
1139 | *p++ = htonl((u32) req->rq_seqno); | |
1140 | *p++ = htonl((u32) gss_cred->gc_service); | |
1141 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
1142 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
1143 | ||
1144 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
1145 | * starting with the xid and ending at the end of the credential: */ | |
808012fb CL |
1146 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
1147 | req->rq_snd_buf.head[0].iov_base); | |
1da177e4 LT |
1148 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
1149 | xdr_buf_from_iov(&iov, &verf_buf); | |
1150 | ||
1151 | /* set verifier flavor*/ | |
1152 | *p++ = htonl(RPC_AUTH_GSS); | |
1153 | ||
1154 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 1155 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1156 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 1157 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1158 | } else if (maj_stat != 0) { |
1159 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
1160 | goto out_put_ctx; | |
1161 | } | |
1162 | p = xdr_encode_opaque(p, NULL, mic.len); | |
1163 | gss_put_ctx(ctx); | |
1164 | return p; | |
1165 | out_put_ctx: | |
1166 | gss_put_ctx(ctx); | |
1167 | return NULL; | |
1168 | } | |
1169 | ||
cd019f75 TM |
1170 | static int gss_renew_cred(struct rpc_task *task) |
1171 | { | |
a17c2153 | 1172 | struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1173 | struct gss_cred *gss_cred = container_of(oldcred, |
1174 | struct gss_cred, | |
1175 | gc_base); | |
1176 | struct rpc_auth *auth = oldcred->cr_auth; | |
1177 | struct auth_cred acred = { | |
1178 | .uid = oldcred->cr_uid, | |
68c97153 TM |
1179 | .principal = gss_cred->gc_principal, |
1180 | .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), | |
cd019f75 TM |
1181 | }; |
1182 | struct rpc_cred *new; | |
1183 | ||
1184 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
1185 | if (IS_ERR(new)) | |
1186 | return PTR_ERR(new); | |
a17c2153 | 1187 | task->tk_rqstp->rq_cred = new; |
cd019f75 TM |
1188 | put_rpccred(oldcred); |
1189 | return 0; | |
1190 | } | |
1191 | ||
126e216a TM |
1192 | static int gss_cred_is_negative_entry(struct rpc_cred *cred) |
1193 | { | |
1194 | if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { | |
1195 | unsigned long now = jiffies; | |
1196 | unsigned long begin, expire; | |
1197 | struct gss_cred *gss_cred; | |
1198 | ||
1199 | gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1200 | begin = gss_cred->gc_upcall_timestamp; | |
1201 | expire = begin + gss_expired_cred_retry_delay * HZ; | |
1202 | ||
1203 | if (time_in_range_open(now, begin, expire)) | |
1204 | return 1; | |
1205 | } | |
1206 | return 0; | |
1207 | } | |
1208 | ||
1da177e4 LT |
1209 | /* |
1210 | * Refresh credentials. XXX - finish | |
1211 | */ | |
1212 | static int | |
1213 | gss_refresh(struct rpc_task *task) | |
1214 | { | |
a17c2153 | 1215 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1216 | int ret = 0; |
1217 | ||
126e216a TM |
1218 | if (gss_cred_is_negative_entry(cred)) |
1219 | return -EKEYEXPIRED; | |
1220 | ||
cd019f75 TM |
1221 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
1222 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
1223 | ret = gss_renew_cred(task); | |
1224 | if (ret < 0) | |
1225 | goto out; | |
a17c2153 | 1226 | cred = task->tk_rqstp->rq_cred; |
cd019f75 | 1227 | } |
1da177e4 | 1228 | |
cd019f75 TM |
1229 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
1230 | ret = gss_refresh_upcall(task); | |
1231 | out: | |
1232 | return ret; | |
1da177e4 LT |
1233 | } |
1234 | ||
0df7fb74 TM |
1235 | /* Dummy refresh routine: used only when destroying the context */ |
1236 | static int | |
1237 | gss_refresh_null(struct rpc_task *task) | |
1238 | { | |
1239 | return -EACCES; | |
1240 | } | |
1241 | ||
d8ed029d AD |
1242 | static __be32 * |
1243 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1244 | { |
a17c2153 | 1245 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 | 1246 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 1247 | __be32 seq; |
1da177e4 LT |
1248 | struct kvec iov; |
1249 | struct xdr_buf verf_buf; | |
1250 | struct xdr_netobj mic; | |
1251 | u32 flav,len; | |
1252 | u32 maj_stat; | |
1253 | ||
8885cb36 | 1254 | dprintk("RPC: %5u gss_validate\n", task->tk_pid); |
1da177e4 LT |
1255 | |
1256 | flav = ntohl(*p++); | |
1257 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 1258 | goto out_bad; |
1da177e4 LT |
1259 | if (flav != RPC_AUTH_GSS) |
1260 | goto out_bad; | |
1261 | seq = htonl(task->tk_rqstp->rq_seqno); | |
1262 | iov.iov_base = &seq; | |
1263 | iov.iov_len = sizeof(seq); | |
1264 | xdr_buf_from_iov(&iov, &verf_buf); | |
1265 | mic.data = (u8 *)p; | |
1266 | mic.len = len; | |
1267 | ||
00fd6e14 | 1268 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1269 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1270 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 1271 | if (maj_stat) { |
014313a9 | 1272 | dprintk("RPC: %5u gss_validate: gss_verify_mic returned " |
0df7fb74 | 1273 | "error 0x%08x\n", task->tk_pid, maj_stat); |
1da177e4 | 1274 | goto out_bad; |
0df7fb74 | 1275 | } |
24b2605b BF |
1276 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1277 | * calculate the length of the verifier: */ | |
1be27f36 | 1278 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 1279 | gss_put_ctx(ctx); |
8885cb36 | 1280 | dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", |
1da177e4 LT |
1281 | task->tk_pid); |
1282 | return p + XDR_QUADLEN(len); | |
1283 | out_bad: | |
1284 | gss_put_ctx(ctx); | |
8885cb36 | 1285 | dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); |
1da177e4 LT |
1286 | return NULL; |
1287 | } | |
1288 | ||
9f06c719 CL |
1289 | static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, |
1290 | __be32 *p, void *obj) | |
1291 | { | |
1292 | struct xdr_stream xdr; | |
1293 | ||
1294 | xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); | |
1295 | encode(rqstp, &xdr, obj); | |
1296 | } | |
1297 | ||
1da177e4 LT |
1298 | static inline int |
1299 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1300 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1301 | __be32 *p, void *obj) | |
1da177e4 LT |
1302 | { |
1303 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1304 | struct xdr_buf integ_buf; | |
d8ed029d | 1305 | __be32 *integ_len = NULL; |
1da177e4 | 1306 | struct xdr_netobj mic; |
d8ed029d AD |
1307 | u32 offset; |
1308 | __be32 *q; | |
1da177e4 LT |
1309 | struct kvec *iov; |
1310 | u32 maj_stat = 0; | |
1311 | int status = -EIO; | |
1312 | ||
1313 | integ_len = p++; | |
1314 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1315 | *p++ = htonl(rqstp->rq_seqno); | |
1316 | ||
9f06c719 | 1317 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1da177e4 LT |
1318 | |
1319 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1320 | offset, snd_buf->len - offset)) | |
1321 | return status; | |
1322 | *integ_len = htonl(integ_buf.len); | |
1323 | ||
1324 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1325 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1326 | iov = snd_buf->tail; |
1327 | else | |
1328 | iov = snd_buf->head; | |
1329 | p = iov->iov_base + iov->iov_len; | |
1330 | mic.data = (u8 *)(p + 1); | |
1331 | ||
00fd6e14 | 1332 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1333 | status = -EIO; /* XXX? */ |
1334 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1335 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1336 | else if (maj_stat) |
1337 | return status; | |
1338 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1339 | ||
1340 | offset = (u8 *)q - (u8 *)p; | |
1341 | iov->iov_len += offset; | |
1342 | snd_buf->len += offset; | |
1343 | return 0; | |
1344 | } | |
1345 | ||
2d2da60c BF |
1346 | static void |
1347 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1348 | { | |
1349 | int i; | |
1350 | ||
1351 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1352 | __free_page(rqstp->rq_enc_pages[i]); | |
1353 | kfree(rqstp->rq_enc_pages); | |
1354 | } | |
1355 | ||
1356 | static int | |
1357 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1358 | { | |
1359 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1360 | int first, last, i; | |
1361 | ||
1362 | if (snd_buf->page_len == 0) { | |
1363 | rqstp->rq_enc_pages_num = 0; | |
1364 | return 0; | |
1365 | } | |
1366 | ||
1367 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1368 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1369 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1370 | rqstp->rq_enc_pages | |
1371 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1372 | GFP_NOFS); | |
1373 | if (!rqstp->rq_enc_pages) | |
1374 | goto out; | |
1375 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1376 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1377 | if (rqstp->rq_enc_pages[i] == NULL) | |
1378 | goto out_free; | |
1379 | } | |
1380 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1381 | return 0; | |
1382 | out_free: | |
cdead7cf TM |
1383 | rqstp->rq_enc_pages_num = i; |
1384 | priv_release_snd_buf(rqstp); | |
2d2da60c BF |
1385 | out: |
1386 | return -EAGAIN; | |
1387 | } | |
1388 | ||
1389 | static inline int | |
1390 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1391 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1392 | __be32 *p, void *obj) | |
2d2da60c BF |
1393 | { |
1394 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1395 | u32 offset; | |
1396 | u32 maj_stat; | |
1397 | int status; | |
d8ed029d | 1398 | __be32 *opaque_len; |
2d2da60c BF |
1399 | struct page **inpages; |
1400 | int first; | |
1401 | int pad; | |
1402 | struct kvec *iov; | |
1403 | char *tmp; | |
1404 | ||
1405 | opaque_len = p++; | |
1406 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1407 | *p++ = htonl(rqstp->rq_seqno); | |
1408 | ||
9f06c719 | 1409 | gss_wrap_req_encode(encode, rqstp, p, obj); |
2d2da60c BF |
1410 | |
1411 | status = alloc_enc_pages(rqstp); | |
1412 | if (status) | |
1413 | return status; | |
1414 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1415 | inpages = snd_buf->pages + first; | |
1416 | snd_buf->pages = rqstp->rq_enc_pages; | |
1417 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
7561042f KC |
1418 | /* |
1419 | * Give the tail its own page, in case we need extra space in the | |
1420 | * head when wrapping: | |
1421 | * | |
1422 | * call_allocate() allocates twice the slack space required | |
1423 | * by the authentication flavor to rq_callsize. | |
1424 | * For GSS, slack is GSS_CRED_SLACK. | |
1425 | */ | |
2d2da60c BF |
1426 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
1427 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1428 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1429 | snd_buf->tail[0].iov_base = tmp; | |
1430 | } | |
00fd6e14 | 1431 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
7561042f | 1432 | /* slack space should prevent this ever happening: */ |
2d2da60c | 1433 | BUG_ON(snd_buf->len > snd_buf->buflen); |
cca5172a | 1434 | status = -EIO; |
2d2da60c BF |
1435 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1436 | * done anyway, so it's safe to put the request on the wire: */ | |
1437 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1438 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1439 | else if (maj_stat) |
1440 | return status; | |
1441 | ||
1442 | *opaque_len = htonl(snd_buf->len - offset); | |
1443 | /* guess whether we're in the head or the tail: */ | |
1444 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1445 | iov = snd_buf->tail; | |
1446 | else | |
1447 | iov = snd_buf->head; | |
1448 | p = iov->iov_base + iov->iov_len; | |
1449 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1450 | memset(p, 0, pad); | |
1451 | iov->iov_len += pad; | |
1452 | snd_buf->len += pad; | |
1453 | ||
1454 | return 0; | |
1455 | } | |
1456 | ||
1da177e4 LT |
1457 | static int |
1458 | gss_wrap_req(struct rpc_task *task, | |
9f06c719 | 1459 | kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1460 | { |
a17c2153 | 1461 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1462 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1463 | gc_base); | |
1464 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1465 | int status = -EIO; | |
1466 | ||
8885cb36 | 1467 | dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); |
1da177e4 LT |
1468 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1469 | /* The spec seems a little ambiguous here, but I think that not | |
1470 | * wrapping context destruction requests makes the most sense. | |
1471 | */ | |
9f06c719 CL |
1472 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1473 | status = 0; | |
1da177e4 LT |
1474 | goto out; |
1475 | } | |
1476 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1477 | case RPC_GSS_SVC_NONE: |
1478 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1479 | status = 0; | |
1480 | break; | |
1481 | case RPC_GSS_SVC_INTEGRITY: | |
1482 | status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); | |
1483 | break; | |
1484 | case RPC_GSS_SVC_PRIVACY: | |
1485 | status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); | |
1486 | break; | |
1da177e4 LT |
1487 | } |
1488 | out: | |
1489 | gss_put_ctx(ctx); | |
8885cb36 | 1490 | dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); |
1da177e4 LT |
1491 | return status; |
1492 | } | |
1493 | ||
1494 | static inline int | |
1495 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1496 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1497 | { |
1498 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1499 | struct xdr_buf integ_buf; | |
1500 | struct xdr_netobj mic; | |
1501 | u32 data_offset, mic_offset; | |
1502 | u32 integ_len; | |
1503 | u32 maj_stat; | |
1504 | int status = -EIO; | |
1505 | ||
1506 | integ_len = ntohl(*(*p)++); | |
1507 | if (integ_len & 3) | |
1508 | return status; | |
1509 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1510 | mic_offset = integ_len + data_offset; | |
1511 | if (mic_offset > rcv_buf->len) | |
1512 | return status; | |
1513 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1514 | return status; | |
1515 | ||
1516 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1517 | mic_offset - data_offset)) | |
1518 | return status; | |
1519 | ||
1520 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1521 | return status; | |
1522 | ||
00fd6e14 | 1523 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1524 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1525 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1526 | if (maj_stat != GSS_S_COMPLETE) |
1527 | return status; | |
1528 | return 0; | |
1529 | } | |
1530 | ||
2d2da60c BF |
1531 | static inline int |
1532 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1533 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1534 | { |
1535 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1536 | u32 offset; | |
1537 | u32 opaque_len; | |
1538 | u32 maj_stat; | |
1539 | int status = -EIO; | |
1540 | ||
1541 | opaque_len = ntohl(*(*p)++); | |
1542 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1543 | if (offset + opaque_len > rcv_buf->len) | |
1544 | return status; | |
1545 | /* remove padding: */ | |
1546 | rcv_buf->len = offset + opaque_len; | |
1547 | ||
00fd6e14 | 1548 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1549 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1550 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1551 | if (maj_stat != GSS_S_COMPLETE) |
1552 | return status; | |
1553 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1554 | return status; | |
1555 | ||
1556 | return 0; | |
1557 | } | |
1558 | ||
bf269551 CL |
1559 | static int |
1560 | gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, | |
1561 | __be32 *p, void *obj) | |
1562 | { | |
1563 | struct xdr_stream xdr; | |
1564 | ||
1565 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
1566 | return decode(rqstp, &xdr, obj); | |
1567 | } | |
2d2da60c | 1568 | |
1da177e4 LT |
1569 | static int |
1570 | gss_unwrap_resp(struct rpc_task *task, | |
bf269551 | 1571 | kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1572 | { |
a17c2153 | 1573 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1574 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1575 | gc_base); | |
1576 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1577 | __be32 *savedp = p; |
2d2da60c BF |
1578 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1579 | int savedlen = head->iov_len; | |
1da177e4 LT |
1580 | int status = -EIO; |
1581 | ||
1582 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1583 | goto out_decode; | |
1584 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1585 | case RPC_GSS_SVC_NONE: |
1586 | break; | |
1587 | case RPC_GSS_SVC_INTEGRITY: | |
1588 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1589 | if (status) | |
1590 | goto out; | |
1591 | break; | |
1592 | case RPC_GSS_SVC_PRIVACY: | |
1593 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); | |
1594 | if (status) | |
1595 | goto out; | |
1596 | break; | |
1da177e4 | 1597 | } |
24b2605b | 1598 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 1599 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 1600 | + (savedlen - head->iov_len); |
1da177e4 | 1601 | out_decode: |
bf269551 | 1602 | status = gss_unwrap_req_decode(decode, rqstp, p, obj); |
1da177e4 LT |
1603 | out: |
1604 | gss_put_ctx(ctx); | |
8885cb36 | 1605 | dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, |
1da177e4 LT |
1606 | status); |
1607 | return status; | |
1608 | } | |
cca5172a | 1609 | |
f1c0a861 | 1610 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1611 | .owner = THIS_MODULE, |
1612 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 1613 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
1614 | .create = gss_create, |
1615 | .destroy = gss_destroy, | |
1616 | .lookup_cred = gss_lookup_cred, | |
1617 | .crcreate = gss_create_cred | |
1618 | }; | |
1619 | ||
f1c0a861 | 1620 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1621 | .cr_name = "AUTH_GSS", |
1622 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1623 | .cr_init = gss_cred_init, |
5c691044 | 1624 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
1625 | .crmatch = gss_match, |
1626 | .crmarshal = gss_marshal, | |
1627 | .crrefresh = gss_refresh, | |
1628 | .crvalidate = gss_validate, | |
1629 | .crwrap_req = gss_wrap_req, | |
1630 | .crunwrap_resp = gss_unwrap_resp, | |
1631 | }; | |
1632 | ||
0df7fb74 TM |
1633 | static const struct rpc_credops gss_nullops = { |
1634 | .cr_name = "AUTH_GSS", | |
6dcd3926 | 1635 | .crdestroy = gss_destroy_nullcred, |
5c691044 | 1636 | .crbind = rpcauth_generic_bind_cred, |
0df7fb74 TM |
1637 | .crmatch = gss_match, |
1638 | .crmarshal = gss_marshal, | |
1639 | .crrefresh = gss_refresh_null, | |
1640 | .crvalidate = gss_validate, | |
1641 | .crwrap_req = gss_wrap_req, | |
1642 | .crunwrap_resp = gss_unwrap_resp, | |
1643 | }; | |
1644 | ||
b693ba4a | 1645 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
c1225158 | 1646 | .upcall = rpc_pipe_generic_upcall, |
34769fc4 BF |
1647 | .downcall = gss_pipe_downcall, |
1648 | .destroy_msg = gss_pipe_destroy_msg, | |
1649 | .open_pipe = gss_pipe_open_v0, | |
1650 | .release_pipe = gss_pipe_release, | |
1651 | }; | |
1652 | ||
b693ba4a | 1653 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
c1225158 | 1654 | .upcall = rpc_pipe_generic_upcall, |
1da177e4 LT |
1655 | .downcall = gss_pipe_downcall, |
1656 | .destroy_msg = gss_pipe_destroy_msg, | |
34769fc4 | 1657 | .open_pipe = gss_pipe_open_v1, |
1da177e4 LT |
1658 | .release_pipe = gss_pipe_release, |
1659 | }; | |
1660 | ||
1661 | /* | |
1662 | * Initialize RPCSEC_GSS module | |
1663 | */ | |
1664 | static int __init init_rpcsec_gss(void) | |
1665 | { | |
1666 | int err = 0; | |
1667 | ||
1668 | err = rpcauth_register(&authgss_ops); | |
1669 | if (err) | |
1670 | goto out; | |
1671 | err = gss_svc_init(); | |
1672 | if (err) | |
1673 | goto out_unregister; | |
79a3f20b | 1674 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
1da177e4 LT |
1675 | return 0; |
1676 | out_unregister: | |
1677 | rpcauth_unregister(&authgss_ops); | |
1678 | out: | |
1679 | return err; | |
1680 | } | |
1681 | ||
1682 | static void __exit exit_rpcsec_gss(void) | |
1683 | { | |
1684 | gss_svc_shutdown(); | |
1685 | rpcauth_unregister(&authgss_ops); | |
bf12691d | 1686 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1687 | } |
1688 | ||
1689 | MODULE_LICENSE("GPL"); | |
126e216a TM |
1690 | module_param_named(expired_cred_retry_delay, |
1691 | gss_expired_cred_retry_delay, | |
1692 | uint, 0644); | |
1693 | MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " | |
1694 | "the RPC engine retries an expired credential"); | |
1695 | ||
1da177e4 LT |
1696 | module_init(init_rpcsec_gss) |
1697 | module_exit(exit_rpcsec_gss) |