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 | 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; | |
620038f6 | 195 | unsigned long now = jiffies; |
1da177e4 LT |
196 | u32 window_size; |
197 | int ret; | |
198 | ||
620038f6 AA |
199 | /* First unsigned int gives the remaining lifetime in seconds of the |
200 | * credential - e.g. the remaining TGT lifetime for Kerberos or | |
201 | * the -t value passed to GSSD. | |
202 | */ | |
1da177e4 LT |
203 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); |
204 | if (IS_ERR(p)) | |
205 | goto err; | |
206 | if (timeout == 0) | |
207 | timeout = GSSD_MIN_TIMEOUT; | |
620038f6 AA |
208 | ctx->gc_expiry = now + ((unsigned long)timeout * HZ); |
209 | /* Sequence number window. Determines the maximum number of | |
210 | * simultaneous requests | |
211 | */ | |
1da177e4 LT |
212 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); |
213 | if (IS_ERR(p)) | |
214 | goto err; | |
215 | ctx->gc_win = window_size; | |
216 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
217 | if (ctx->gc_win == 0) { | |
dc5ddce9 JL |
218 | /* |
219 | * in which case, p points to an error code. Anything other | |
220 | * than -EKEYEXPIRED gets converted to -EACCES. | |
221 | */ | |
222 | p = simple_get_bytes(p, end, &ret, sizeof(ret)); | |
223 | if (!IS_ERR(p)) | |
224 | p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : | |
225 | ERR_PTR(-EACCES); | |
1da177e4 LT |
226 | goto err; |
227 | } | |
228 | /* copy the opaque wire context */ | |
229 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
230 | if (IS_ERR(p)) | |
231 | goto err; | |
232 | /* import the opaque security context */ | |
233 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
234 | if (IS_ERR(p)) | |
235 | goto err; | |
236 | q = (const void *)((const char *)p + seclen); | |
237 | if (unlikely(q > end || q < p)) { | |
238 | p = ERR_PTR(-EFAULT); | |
239 | goto err; | |
240 | } | |
1f4c86c0 | 241 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, GFP_NOFS); |
1da177e4 LT |
242 | if (ret < 0) { |
243 | p = ERR_PTR(ret); | |
244 | goto err; | |
245 | } | |
620038f6 AA |
246 | dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u\n", |
247 | __func__, ctx->gc_expiry, now, timeout); | |
1da177e4 LT |
248 | return q; |
249 | err: | |
620038f6 AA |
250 | dprintk("RPC: %s returns %ld gc_expiry %lu now %lu timeout %u\n", |
251 | __func__, -PTR_ERR(p), ctx->gc_expiry, now, timeout); | |
1da177e4 LT |
252 | return p; |
253 | } | |
254 | ||
34769fc4 | 255 | #define UPCALL_BUF_LEN 128 |
1da177e4 LT |
256 | |
257 | struct gss_upcall_msg { | |
258 | atomic_t count; | |
259 | uid_t uid; | |
260 | struct rpc_pipe_msg msg; | |
261 | struct list_head list; | |
262 | struct gss_auth *auth; | |
9beae467 | 263 | struct rpc_pipe *pipe; |
1da177e4 LT |
264 | struct rpc_wait_queue rpc_waitqueue; |
265 | wait_queue_head_t waitqueue; | |
266 | struct gss_cl_ctx *ctx; | |
34769fc4 | 267 | char databuf[UPCALL_BUF_LEN]; |
1da177e4 LT |
268 | }; |
269 | ||
79a3f20b BF |
270 | static int get_pipe_version(void) |
271 | { | |
272 | int ret; | |
273 | ||
274 | spin_lock(&pipe_version_lock); | |
275 | if (pipe_version >= 0) { | |
276 | atomic_inc(&pipe_users); | |
34769fc4 | 277 | ret = pipe_version; |
79a3f20b BF |
278 | } else |
279 | ret = -EAGAIN; | |
280 | spin_unlock(&pipe_version_lock); | |
281 | return ret; | |
282 | } | |
283 | ||
284 | static void put_pipe_version(void) | |
285 | { | |
286 | if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) { | |
287 | pipe_version = -1; | |
288 | spin_unlock(&pipe_version_lock); | |
289 | } | |
290 | } | |
291 | ||
1da177e4 LT |
292 | static void |
293 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
294 | { | |
295 | if (!atomic_dec_and_test(&gss_msg->count)) | |
296 | return; | |
79a3f20b | 297 | put_pipe_version(); |
1da177e4 LT |
298 | BUG_ON(!list_empty(&gss_msg->list)); |
299 | if (gss_msg->ctx != NULL) | |
300 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 301 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
1da177e4 LT |
302 | kfree(gss_msg); |
303 | } | |
304 | ||
305 | static struct gss_upcall_msg * | |
9beae467 | 306 | __gss_find_upcall(struct rpc_pipe *pipe, uid_t uid) |
1da177e4 LT |
307 | { |
308 | struct gss_upcall_msg *pos; | |
9beae467 | 309 | list_for_each_entry(pos, &pipe->in_downcall, list) { |
1da177e4 LT |
310 | if (pos->uid != uid) |
311 | continue; | |
312 | atomic_inc(&pos->count); | |
632f0d05 | 313 | dprintk("RPC: %s found msg %p\n", __func__, pos); |
1da177e4 LT |
314 | return pos; |
315 | } | |
632f0d05 | 316 | dprintk("RPC: %s found nothing\n", __func__); |
1da177e4 LT |
317 | return NULL; |
318 | } | |
319 | ||
720b8f2d | 320 | /* Try to add an upcall to the pipefs queue. |
1da177e4 LT |
321 | * If an upcall owned by our uid already exists, then we return a reference |
322 | * to that upcall instead of adding the new upcall. | |
323 | */ | |
324 | static inline struct gss_upcall_msg * | |
053e324f | 325 | gss_add_msg(struct gss_upcall_msg *gss_msg) |
1da177e4 | 326 | { |
9beae467 | 327 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 LT |
328 | struct gss_upcall_msg *old; |
329 | ||
9beae467 SK |
330 | spin_lock(&pipe->lock); |
331 | old = __gss_find_upcall(pipe, gss_msg->uid); | |
1da177e4 LT |
332 | if (old == NULL) { |
333 | atomic_inc(&gss_msg->count); | |
9beae467 | 334 | list_add(&gss_msg->list, &pipe->in_downcall); |
1da177e4 LT |
335 | } else |
336 | gss_msg = old; | |
9beae467 | 337 | spin_unlock(&pipe->lock); |
1da177e4 LT |
338 | return gss_msg; |
339 | } | |
340 | ||
341 | static void | |
342 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
343 | { | |
1da177e4 LT |
344 | list_del_init(&gss_msg->list); |
345 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
346 | wake_up_all(&gss_msg->waitqueue); | |
347 | atomic_dec(&gss_msg->count); | |
348 | } | |
349 | ||
350 | static void | |
351 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
352 | { | |
9beae467 | 353 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 354 | |
3b68aaea TM |
355 | if (list_empty(&gss_msg->list)) |
356 | return; | |
9beae467 | 357 | spin_lock(&pipe->lock); |
3b68aaea TM |
358 | if (!list_empty(&gss_msg->list)) |
359 | __gss_unhash_msg(gss_msg); | |
9beae467 | 360 | spin_unlock(&pipe->lock); |
1da177e4 LT |
361 | } |
362 | ||
126e216a TM |
363 | static void |
364 | gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) | |
365 | { | |
366 | switch (gss_msg->msg.errno) { | |
367 | case 0: | |
368 | if (gss_msg->ctx == NULL) | |
369 | break; | |
370 | clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
371 | gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); | |
372 | break; | |
373 | case -EKEYEXPIRED: | |
374 | set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
375 | } | |
376 | gss_cred->gc_upcall_timestamp = jiffies; | |
377 | gss_cred->gc_upcall = NULL; | |
378 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
379 | } | |
380 | ||
1da177e4 LT |
381 | static void |
382 | gss_upcall_callback(struct rpc_task *task) | |
383 | { | |
a17c2153 | 384 | struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, |
1da177e4 LT |
385 | struct gss_cred, gc_base); |
386 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
9beae467 | 387 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 388 | |
9beae467 | 389 | spin_lock(&pipe->lock); |
126e216a | 390 | gss_handle_downcall_result(gss_cred, gss_msg); |
9beae467 | 391 | spin_unlock(&pipe->lock); |
126e216a | 392 | task->tk_status = gss_msg->msg.errno; |
1da177e4 LT |
393 | gss_release_msg(gss_msg); |
394 | } | |
395 | ||
34769fc4 BF |
396 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) |
397 | { | |
398 | gss_msg->msg.data = &gss_msg->uid; | |
399 | gss_msg->msg.len = sizeof(gss_msg->uid); | |
400 | } | |
401 | ||
8b1c7bf5 | 402 | static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
68c97153 TM |
403 | struct rpc_clnt *clnt, |
404 | const char *service_name) | |
34769fc4 | 405 | { |
683ac665 | 406 | struct gss_api_mech *mech = gss_msg->auth->mech; |
8b1c7bf5 OK |
407 | char *p = gss_msg->databuf; |
408 | int len = 0; | |
409 | ||
410 | gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ", | |
683ac665 | 411 | mech->gm_name, |
34769fc4 | 412 | gss_msg->uid); |
8b1c7bf5 OK |
413 | p += gss_msg->msg.len; |
414 | if (clnt->cl_principal) { | |
415 | len = sprintf(p, "target=%s ", clnt->cl_principal); | |
416 | p += len; | |
417 | gss_msg->msg.len += len; | |
418 | } | |
68c97153 TM |
419 | if (service_name != NULL) { |
420 | len = sprintf(p, "service=%s ", service_name); | |
2efef708 OK |
421 | p += len; |
422 | gss_msg->msg.len += len; | |
423 | } | |
683ac665 | 424 | if (mech->gm_upcall_enctypes) { |
f8628220 | 425 | len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes); |
683ac665 TM |
426 | p += len; |
427 | gss_msg->msg.len += len; | |
428 | } | |
8b1c7bf5 OK |
429 | len = sprintf(p, "\n"); |
430 | gss_msg->msg.len += len; | |
431 | ||
34769fc4 BF |
432 | gss_msg->msg.data = gss_msg->databuf; |
433 | BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN); | |
434 | } | |
435 | ||
8b1c7bf5 | 436 | static void gss_encode_msg(struct gss_upcall_msg *gss_msg, |
68c97153 TM |
437 | struct rpc_clnt *clnt, |
438 | const char *service_name) | |
34769fc4 BF |
439 | { |
440 | if (pipe_version == 0) | |
441 | gss_encode_v0_msg(gss_msg); | |
442 | else /* pipe_version == 1 */ | |
68c97153 | 443 | gss_encode_v1_msg(gss_msg, clnt, service_name); |
34769fc4 BF |
444 | } |
445 | ||
68c97153 TM |
446 | static struct gss_upcall_msg * |
447 | gss_alloc_msg(struct gss_auth *gss_auth, struct rpc_clnt *clnt, | |
448 | uid_t uid, const char *service_name) | |
1da177e4 LT |
449 | { |
450 | struct gss_upcall_msg *gss_msg; | |
79a3f20b | 451 | int vers; |
1da177e4 | 452 | |
0f38b873 | 453 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
db75b3d6 BF |
454 | if (gss_msg == NULL) |
455 | return ERR_PTR(-ENOMEM); | |
79a3f20b BF |
456 | vers = get_pipe_version(); |
457 | if (vers < 0) { | |
458 | kfree(gss_msg); | |
459 | return ERR_PTR(vers); | |
460 | } | |
c239d83b | 461 | gss_msg->pipe = gss_auth->pipe[vers]; |
db75b3d6 BF |
462 | INIT_LIST_HEAD(&gss_msg->list); |
463 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
464 | init_waitqueue_head(&gss_msg->waitqueue); | |
465 | atomic_set(&gss_msg->count, 1); | |
db75b3d6 BF |
466 | gss_msg->uid = uid; |
467 | gss_msg->auth = gss_auth; | |
68c97153 | 468 | gss_encode_msg(gss_msg, clnt, service_name); |
1da177e4 LT |
469 | return gss_msg; |
470 | } | |
471 | ||
472 | static struct gss_upcall_msg * | |
473 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
474 | { | |
7c67db3a TM |
475 | struct gss_cred *gss_cred = container_of(cred, |
476 | struct gss_cred, gc_base); | |
1da177e4 | 477 | struct gss_upcall_msg *gss_new, *gss_msg; |
7c67db3a | 478 | uid_t uid = cred->cr_uid; |
1da177e4 | 479 | |
68c97153 | 480 | gss_new = gss_alloc_msg(gss_auth, clnt, uid, gss_cred->gc_principal); |
db75b3d6 BF |
481 | if (IS_ERR(gss_new)) |
482 | return gss_new; | |
053e324f | 483 | gss_msg = gss_add_msg(gss_new); |
1da177e4 | 484 | if (gss_msg == gss_new) { |
9beae467 | 485 | int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); |
1da177e4 LT |
486 | if (res) { |
487 | gss_unhash_msg(gss_new); | |
488 | gss_msg = ERR_PTR(res); | |
489 | } | |
490 | } else | |
491 | gss_release_msg(gss_new); | |
492 | return gss_msg; | |
493 | } | |
494 | ||
b03568c3 BF |
495 | static void warn_gssd(void) |
496 | { | |
497 | static unsigned long ratelimit; | |
498 | unsigned long now = jiffies; | |
499 | ||
500 | if (time_after(now, ratelimit)) { | |
501 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" | |
502 | "Please check user daemon is running.\n"); | |
503 | ratelimit = now + 15*HZ; | |
504 | } | |
505 | } | |
506 | ||
1da177e4 LT |
507 | static inline int |
508 | gss_refresh_upcall(struct rpc_task *task) | |
509 | { | |
a17c2153 | 510 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
4a8c1344 | 511 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
512 | struct gss_auth, rpc_auth); |
513 | struct gss_cred *gss_cred = container_of(cred, | |
514 | struct gss_cred, gc_base); | |
515 | struct gss_upcall_msg *gss_msg; | |
9beae467 | 516 | struct rpc_pipe *pipe; |
1da177e4 LT |
517 | int err = 0; |
518 | ||
632f0d05 CL |
519 | dprintk("RPC: %5u %s for uid %u\n", |
520 | task->tk_pid, __func__, cred->cr_uid); | |
1da177e4 | 521 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
480e3243 | 522 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
79a3f20b BF |
523 | /* XXX: warning on the first, under the assumption we |
524 | * shouldn't normally hit this case on a refresh. */ | |
525 | warn_gssd(); | |
526 | task->tk_timeout = 15*HZ; | |
527 | rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); | |
d1a8016a | 528 | return -EAGAIN; |
79a3f20b | 529 | } |
1da177e4 LT |
530 | if (IS_ERR(gss_msg)) { |
531 | err = PTR_ERR(gss_msg); | |
532 | goto out; | |
533 | } | |
9beae467 SK |
534 | pipe = gss_msg->pipe; |
535 | spin_lock(&pipe->lock); | |
1da177e4 | 536 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 537 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
126e216a | 538 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
1da177e4 LT |
539 | task->tk_timeout = 0; |
540 | gss_cred->gc_upcall = gss_msg; | |
541 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
542 | atomic_inc(&gss_msg->count); | |
5d00837b | 543 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
126e216a TM |
544 | } else { |
545 | gss_handle_downcall_result(gss_cred, gss_msg); | |
1da177e4 | 546 | err = gss_msg->msg.errno; |
126e216a | 547 | } |
9beae467 | 548 | spin_unlock(&pipe->lock); |
1da177e4 LT |
549 | gss_release_msg(gss_msg); |
550 | out: | |
632f0d05 CL |
551 | dprintk("RPC: %5u %s for uid %u result %d\n", |
552 | task->tk_pid, __func__, cred->cr_uid, err); | |
1da177e4 LT |
553 | return err; |
554 | } | |
555 | ||
556 | static inline int | |
557 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
558 | { | |
9beae467 | 559 | struct rpc_pipe *pipe; |
1da177e4 LT |
560 | struct rpc_cred *cred = &gss_cred->gc_base; |
561 | struct gss_upcall_msg *gss_msg; | |
562 | DEFINE_WAIT(wait); | |
563 | int err = 0; | |
564 | ||
632f0d05 | 565 | dprintk("RPC: %s for uid %u\n", __func__, cred->cr_uid); |
79a3f20b | 566 | retry: |
1da177e4 | 567 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
79a3f20b BF |
568 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
569 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, | |
570 | pipe_version >= 0, 15*HZ); | |
d1a8016a BS |
571 | if (pipe_version < 0) { |
572 | warn_gssd(); | |
573 | err = -EACCES; | |
574 | } | |
79a3f20b BF |
575 | if (err) |
576 | goto out; | |
79a3f20b BF |
577 | goto retry; |
578 | } | |
1da177e4 LT |
579 | if (IS_ERR(gss_msg)) { |
580 | err = PTR_ERR(gss_msg); | |
581 | goto out; | |
582 | } | |
9beae467 | 583 | pipe = gss_msg->pipe; |
1da177e4 | 584 | for (;;) { |
5afa9133 | 585 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); |
9beae467 | 586 | spin_lock(&pipe->lock); |
1da177e4 | 587 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
588 | break; |
589 | } | |
9beae467 | 590 | spin_unlock(&pipe->lock); |
5afa9133 | 591 | if (fatal_signal_pending(current)) { |
1da177e4 LT |
592 | err = -ERESTARTSYS; |
593 | goto out_intr; | |
594 | } | |
595 | schedule(); | |
596 | } | |
597 | if (gss_msg->ctx) | |
7b6962b0 | 598 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
599 | else |
600 | err = gss_msg->msg.errno; | |
9beae467 | 601 | spin_unlock(&pipe->lock); |
1da177e4 LT |
602 | out_intr: |
603 | finish_wait(&gss_msg->waitqueue, &wait); | |
604 | gss_release_msg(gss_msg); | |
605 | out: | |
632f0d05 CL |
606 | dprintk("RPC: %s for uid %u result %d\n", |
607 | __func__, cred->cr_uid, err); | |
1da177e4 LT |
608 | return err; |
609 | } | |
610 | ||
1da177e4 LT |
611 | #define MSG_BUF_MAXSIZE 1024 |
612 | ||
613 | static ssize_t | |
614 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
615 | { | |
616 | const void *p, *end; | |
617 | void *buf; | |
1da177e4 | 618 | struct gss_upcall_msg *gss_msg; |
496ad9aa | 619 | struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; |
1da177e4 LT |
620 | struct gss_cl_ctx *ctx; |
621 | uid_t uid; | |
3b68aaea | 622 | ssize_t err = -EFBIG; |
1da177e4 LT |
623 | |
624 | if (mlen > MSG_BUF_MAXSIZE) | |
625 | goto out; | |
626 | err = -ENOMEM; | |
0f38b873 | 627 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
628 | if (!buf) |
629 | goto out; | |
630 | ||
1da177e4 LT |
631 | err = -EFAULT; |
632 | if (copy_from_user(buf, src, mlen)) | |
633 | goto err; | |
634 | ||
635 | end = (const void *)((char *)buf + mlen); | |
636 | p = simple_get_bytes(buf, end, &uid, sizeof(uid)); | |
637 | if (IS_ERR(p)) { | |
638 | err = PTR_ERR(p); | |
639 | goto err; | |
640 | } | |
641 | ||
642 | err = -ENOMEM; | |
643 | ctx = gss_alloc_context(); | |
644 | if (ctx == NULL) | |
645 | goto err; | |
3b68aaea TM |
646 | |
647 | err = -ENOENT; | |
648 | /* Find a matching upcall */ | |
9beae467 SK |
649 | spin_lock(&pipe->lock); |
650 | gss_msg = __gss_find_upcall(pipe, uid); | |
3b68aaea | 651 | if (gss_msg == NULL) { |
9beae467 | 652 | spin_unlock(&pipe->lock); |
3b68aaea TM |
653 | goto err_put_ctx; |
654 | } | |
655 | list_del_init(&gss_msg->list); | |
9beae467 | 656 | spin_unlock(&pipe->lock); |
3b68aaea | 657 | |
6e84c7b6 | 658 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
659 | if (IS_ERR(p)) { |
660 | err = PTR_ERR(p); | |
486bad2e JL |
661 | switch (err) { |
662 | case -EACCES: | |
dc5ddce9 | 663 | case -EKEYEXPIRED: |
486bad2e JL |
664 | gss_msg->msg.errno = err; |
665 | err = mlen; | |
666 | break; | |
667 | case -EFAULT: | |
668 | case -ENOMEM: | |
669 | case -EINVAL: | |
670 | case -ENOSYS: | |
671 | gss_msg->msg.errno = -EAGAIN; | |
672 | break; | |
673 | default: | |
674 | printk(KERN_CRIT "%s: bad return from " | |
6c853099 | 675 | "gss_fill_context: %zd\n", __func__, err); |
486bad2e JL |
676 | BUG(); |
677 | } | |
3b68aaea | 678 | goto err_release_msg; |
1da177e4 | 679 | } |
3b68aaea TM |
680 | gss_msg->ctx = gss_get_ctx(ctx); |
681 | err = mlen; | |
682 | ||
683 | err_release_msg: | |
9beae467 | 684 | spin_lock(&pipe->lock); |
3b68aaea | 685 | __gss_unhash_msg(gss_msg); |
9beae467 | 686 | spin_unlock(&pipe->lock); |
3b68aaea | 687 | gss_release_msg(gss_msg); |
1da177e4 LT |
688 | err_put_ctx: |
689 | gss_put_ctx(ctx); | |
690 | err: | |
691 | kfree(buf); | |
692 | out: | |
632f0d05 | 693 | dprintk("RPC: %s returning %Zd\n", __func__, err); |
1da177e4 LT |
694 | return err; |
695 | } | |
696 | ||
34769fc4 | 697 | static int gss_pipe_open(struct inode *inode, int new_version) |
cf81939d | 698 | { |
34769fc4 BF |
699 | int ret = 0; |
700 | ||
79a3f20b BF |
701 | spin_lock(&pipe_version_lock); |
702 | if (pipe_version < 0) { | |
34769fc4 BF |
703 | /* First open of any gss pipe determines the version: */ |
704 | pipe_version = new_version; | |
79a3f20b BF |
705 | rpc_wake_up(&pipe_version_rpc_waitqueue); |
706 | wake_up(&pipe_version_waitqueue); | |
34769fc4 BF |
707 | } else if (pipe_version != new_version) { |
708 | /* Trying to open a pipe of a different version */ | |
709 | ret = -EBUSY; | |
710 | goto out; | |
79a3f20b | 711 | } |
cf81939d | 712 | atomic_inc(&pipe_users); |
34769fc4 | 713 | out: |
79a3f20b | 714 | spin_unlock(&pipe_version_lock); |
34769fc4 BF |
715 | return ret; |
716 | ||
717 | } | |
718 | ||
719 | static int gss_pipe_open_v0(struct inode *inode) | |
720 | { | |
721 | return gss_pipe_open(inode, 0); | |
722 | } | |
723 | ||
724 | static int gss_pipe_open_v1(struct inode *inode) | |
725 | { | |
726 | return gss_pipe_open(inode, 1); | |
cf81939d BF |
727 | } |
728 | ||
1da177e4 LT |
729 | static void |
730 | gss_pipe_release(struct inode *inode) | |
731 | { | |
9beae467 | 732 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
6e84c7b6 | 733 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 734 | |
5a67657a | 735 | restart: |
9beae467 SK |
736 | spin_lock(&pipe->lock); |
737 | list_for_each_entry(gss_msg, &pipe->in_downcall, list) { | |
1da177e4 | 738 | |
5a67657a TM |
739 | if (!list_empty(&gss_msg->msg.list)) |
740 | continue; | |
1da177e4 LT |
741 | gss_msg->msg.errno = -EPIPE; |
742 | atomic_inc(&gss_msg->count); | |
743 | __gss_unhash_msg(gss_msg); | |
9beae467 | 744 | spin_unlock(&pipe->lock); |
1da177e4 | 745 | gss_release_msg(gss_msg); |
5a67657a | 746 | goto restart; |
1da177e4 | 747 | } |
9beae467 | 748 | spin_unlock(&pipe->lock); |
cf81939d | 749 | |
79a3f20b | 750 | put_pipe_version(); |
1da177e4 LT |
751 | } |
752 | ||
753 | static void | |
754 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
755 | { | |
756 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
1da177e4 LT |
757 | |
758 | if (msg->errno < 0) { | |
632f0d05 CL |
759 | dprintk("RPC: %s releasing msg %p\n", |
760 | __func__, gss_msg); | |
1da177e4 LT |
761 | atomic_inc(&gss_msg->count); |
762 | gss_unhash_msg(gss_msg); | |
b03568c3 BF |
763 | if (msg->errno == -ETIMEDOUT) |
764 | warn_gssd(); | |
1da177e4 LT |
765 | gss_release_msg(gss_msg); |
766 | } | |
767 | } | |
768 | ||
ccdc28f8 SK |
769 | static void gss_pipes_dentries_destroy(struct rpc_auth *auth) |
770 | { | |
771 | struct gss_auth *gss_auth; | |
772 | ||
773 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
80df9d20 SK |
774 | if (gss_auth->pipe[0]->dentry) |
775 | rpc_unlink(gss_auth->pipe[0]->dentry); | |
776 | if (gss_auth->pipe[1]->dentry) | |
777 | rpc_unlink(gss_auth->pipe[1]->dentry); | |
ccdc28f8 SK |
778 | } |
779 | ||
780 | static int gss_pipes_dentries_create(struct rpc_auth *auth) | |
781 | { | |
782 | int err; | |
783 | struct gss_auth *gss_auth; | |
784 | struct rpc_clnt *clnt; | |
785 | ||
786 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
787 | clnt = gss_auth->client; | |
788 | ||
30507f58 | 789 | gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry, |
ccdc28f8 SK |
790 | "gssd", |
791 | clnt, gss_auth->pipe[1]); | |
792 | if (IS_ERR(gss_auth->pipe[1]->dentry)) | |
793 | return PTR_ERR(gss_auth->pipe[1]->dentry); | |
30507f58 | 794 | gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry, |
ccdc28f8 SK |
795 | gss_auth->mech->gm_name, |
796 | clnt, gss_auth->pipe[0]); | |
797 | if (IS_ERR(gss_auth->pipe[0]->dentry)) { | |
798 | err = PTR_ERR(gss_auth->pipe[0]->dentry); | |
799 | goto err_unlink_pipe_1; | |
800 | } | |
801 | return 0; | |
802 | ||
803 | err_unlink_pipe_1: | |
804 | rpc_unlink(gss_auth->pipe[1]->dentry); | |
805 | return err; | |
806 | } | |
807 | ||
808 | static void gss_pipes_dentries_destroy_net(struct rpc_clnt *clnt, | |
809 | struct rpc_auth *auth) | |
810 | { | |
2446ab60 | 811 | struct net *net = rpc_net_ns(clnt); |
ccdc28f8 SK |
812 | struct super_block *sb; |
813 | ||
814 | sb = rpc_get_sb_net(net); | |
815 | if (sb) { | |
30507f58 | 816 | if (clnt->cl_dentry) |
ccdc28f8 SK |
817 | gss_pipes_dentries_destroy(auth); |
818 | rpc_put_sb_net(net); | |
819 | } | |
820 | } | |
821 | ||
822 | static int gss_pipes_dentries_create_net(struct rpc_clnt *clnt, | |
823 | struct rpc_auth *auth) | |
824 | { | |
2446ab60 | 825 | struct net *net = rpc_net_ns(clnt); |
ccdc28f8 SK |
826 | struct super_block *sb; |
827 | int err = 0; | |
828 | ||
829 | sb = rpc_get_sb_net(net); | |
830 | if (sb) { | |
30507f58 | 831 | if (clnt->cl_dentry) |
ccdc28f8 SK |
832 | err = gss_pipes_dentries_create(auth); |
833 | rpc_put_sb_net(net); | |
834 | } | |
835 | return err; | |
836 | } | |
837 | ||
cca5172a YH |
838 | /* |
839 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
840 | * parameters based on the input flavor (which must be a pseudoflavor) |
841 | */ | |
842 | static struct rpc_auth * | |
843 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
844 | { | |
845 | struct gss_auth *gss_auth; | |
846 | struct rpc_auth * auth; | |
6a19275a | 847 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 848 | |
8885cb36 | 849 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
850 | |
851 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 852 | return ERR_PTR(err); |
1da177e4 LT |
853 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
854 | goto out_dec; | |
855 | gss_auth->client = clnt; | |
6a19275a | 856 | err = -EINVAL; |
1da177e4 LT |
857 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
858 | if (!gss_auth->mech) { | |
3392c349 | 859 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", |
0dc47877 | 860 | __func__, flavor); |
1da177e4 LT |
861 | goto err_free; |
862 | } | |
863 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
864 | if (gss_auth->service == 0) |
865 | goto err_put_mech; | |
1da177e4 LT |
866 | auth = &gss_auth->rpc_auth; |
867 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
868 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
869 | auth->au_ops = &authgss_ops; | |
870 | auth->au_flavor = flavor; | |
871 | atomic_set(&auth->au_count, 1); | |
0285ed1f | 872 | kref_init(&gss_auth->kref); |
1da177e4 | 873 | |
34769fc4 BF |
874 | /* |
875 | * Note: if we created the old pipe first, then someone who | |
876 | * examined the directory at the right moment might conclude | |
877 | * that we supported only the old pipe. So we instead create | |
878 | * the new pipe first. | |
879 | */ | |
c239d83b SK |
880 | gss_auth->pipe[1] = rpc_mkpipe_data(&gss_upcall_ops_v1, |
881 | RPC_PIPE_WAIT_FOR_OPEN); | |
882 | if (IS_ERR(gss_auth->pipe[1])) { | |
883 | err = PTR_ERR(gss_auth->pipe[1]); | |
1da177e4 | 884 | goto err_put_mech; |
6a19275a | 885 | } |
1da177e4 | 886 | |
c239d83b SK |
887 | gss_auth->pipe[0] = rpc_mkpipe_data(&gss_upcall_ops_v0, |
888 | RPC_PIPE_WAIT_FOR_OPEN); | |
889 | if (IS_ERR(gss_auth->pipe[0])) { | |
890 | err = PTR_ERR(gss_auth->pipe[0]); | |
891 | goto err_destroy_pipe_1; | |
892 | } | |
ccdc28f8 SK |
893 | err = gss_pipes_dentries_create_net(clnt, auth); |
894 | if (err) | |
c239d83b | 895 | goto err_destroy_pipe_0; |
f5c2187c | 896 | err = rpcauth_init_credcache(auth); |
07a2bf1d | 897 | if (err) |
ccdc28f8 | 898 | goto err_unlink_pipes; |
07a2bf1d | 899 | |
1da177e4 | 900 | return auth; |
ccdc28f8 SK |
901 | err_unlink_pipes: |
902 | gss_pipes_dentries_destroy_net(clnt, auth); | |
c239d83b SK |
903 | err_destroy_pipe_0: |
904 | rpc_destroy_pipe_data(gss_auth->pipe[0]); | |
905 | err_destroy_pipe_1: | |
906 | rpc_destroy_pipe_data(gss_auth->pipe[1]); | |
1da177e4 LT |
907 | err_put_mech: |
908 | gss_mech_put(gss_auth->mech); | |
909 | err_free: | |
910 | kfree(gss_auth); | |
911 | out_dec: | |
912 | module_put(THIS_MODULE); | |
6a19275a | 913 | return ERR_PTR(err); |
1da177e4 LT |
914 | } |
915 | ||
0285ed1f TM |
916 | static void |
917 | gss_free(struct gss_auth *gss_auth) | |
918 | { | |
ccdc28f8 | 919 | gss_pipes_dentries_destroy_net(gss_auth->client, &gss_auth->rpc_auth); |
c239d83b SK |
920 | rpc_destroy_pipe_data(gss_auth->pipe[0]); |
921 | rpc_destroy_pipe_data(gss_auth->pipe[1]); | |
0285ed1f TM |
922 | gss_mech_put(gss_auth->mech); |
923 | ||
924 | kfree(gss_auth); | |
925 | module_put(THIS_MODULE); | |
926 | } | |
927 | ||
928 | static void | |
929 | gss_free_callback(struct kref *kref) | |
930 | { | |
931 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
932 | ||
933 | gss_free(gss_auth); | |
934 | } | |
935 | ||
1da177e4 LT |
936 | static void |
937 | gss_destroy(struct rpc_auth *auth) | |
938 | { | |
939 | struct gss_auth *gss_auth; | |
940 | ||
8885cb36 CL |
941 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
942 | auth, auth->au_flavor); | |
1da177e4 | 943 | |
3ab9bb72 TM |
944 | rpcauth_destroy_credcache(auth); |
945 | ||
1da177e4 | 946 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
0285ed1f | 947 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
948 | } |
949 | ||
0df7fb74 TM |
950 | /* |
951 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
952 | * to the server with the GSS control procedure field set to | |
953 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
954 | * all RPCSEC_GSS state associated with that context. | |
955 | */ | |
956 | static int | |
957 | gss_destroying_context(struct rpc_cred *cred) | |
958 | { | |
959 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
960 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
961 | struct rpc_task *task; | |
962 | ||
963 | if (gss_cred->gc_ctx == NULL || | |
6dcd3926 | 964 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
0df7fb74 TM |
965 | return 0; |
966 | ||
967 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
968 | cred->cr_ops = &gss_nullops; | |
969 | ||
970 | /* Take a reference to ensure the cred will be destroyed either | |
971 | * by the RPC call or by the put_rpccred() below */ | |
972 | get_rpccred(cred); | |
973 | ||
080a1f14 | 974 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
0df7fb74 TM |
975 | if (!IS_ERR(task)) |
976 | rpc_put_task(task); | |
977 | ||
978 | put_rpccred(cred); | |
979 | return 1; | |
980 | } | |
981 | ||
982 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
983 | * to create a new cred or context, so they check that things have been |
984 | * allocated before freeing them. */ | |
985 | static void | |
5d28dc82 | 986 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 987 | { |
632f0d05 | 988 | dprintk("RPC: %s\n", __func__); |
1da177e4 | 989 | |
0d8a3746 | 990 | gss_delete_sec_context(&ctx->gc_gss_ctx); |
1da177e4 LT |
991 | kfree(ctx->gc_wire_ctx.data); |
992 | kfree(ctx); | |
993 | } | |
994 | ||
5d28dc82 TM |
995 | static void |
996 | gss_free_ctx_callback(struct rcu_head *head) | |
997 | { | |
998 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
999 | gss_do_free_ctx(ctx); | |
1000 | } | |
1001 | ||
1002 | static void | |
1003 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
1004 | { | |
1005 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); | |
1006 | } | |
1007 | ||
1da177e4 | 1008 | static void |
31be5bf1 | 1009 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 1010 | { |
632f0d05 | 1011 | dprintk("RPC: %s cred=%p\n", __func__, gss_cred); |
31be5bf1 TM |
1012 | kfree(gss_cred); |
1013 | } | |
1da177e4 | 1014 | |
31be5bf1 TM |
1015 | static void |
1016 | gss_free_cred_callback(struct rcu_head *head) | |
1017 | { | |
1018 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
1019 | gss_free_cred(gss_cred); | |
1020 | } | |
1da177e4 | 1021 | |
31be5bf1 | 1022 | static void |
6dcd3926 | 1023 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 1024 | { |
5d28dc82 | 1025 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 1026 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
5d28dc82 TM |
1027 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
1028 | ||
a9b3cd7f | 1029 | RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); |
31be5bf1 | 1030 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
1031 | if (ctx) |
1032 | gss_put_ctx(ctx); | |
0285ed1f | 1033 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
1034 | } |
1035 | ||
6dcd3926 JL |
1036 | static void |
1037 | gss_destroy_cred(struct rpc_cred *cred) | |
1038 | { | |
1039 | ||
1040 | if (gss_destroying_context(cred)) | |
1041 | return; | |
1042 | gss_destroy_nullcred(cred); | |
1043 | } | |
1044 | ||
1da177e4 LT |
1045 | /* |
1046 | * Lookup RPCSEC_GSS cred for the current process | |
1047 | */ | |
1048 | static struct rpc_cred * | |
8a317760 | 1049 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 1050 | { |
8a317760 | 1051 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
1052 | } |
1053 | ||
1054 | static struct rpc_cred * | |
8a317760 | 1055 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
1056 | { |
1057 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1058 | struct gss_cred *cred = NULL; | |
1059 | int err = -ENOMEM; | |
1060 | ||
632f0d05 CL |
1061 | dprintk("RPC: %s for uid %d, flavor %d\n", |
1062 | __func__, acred->uid, auth->au_flavor); | |
1da177e4 | 1063 | |
0f38b873 | 1064 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
1da177e4 LT |
1065 | goto out_err; |
1066 | ||
5fe4755e | 1067 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
1068 | /* |
1069 | * Note: in order to force a call to call_refresh(), we deliberately | |
1070 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
1071 | */ | |
fc432dd9 | 1072 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 1073 | cred->gc_service = gss_auth->service; |
68c97153 TM |
1074 | cred->gc_principal = NULL; |
1075 | if (acred->machine_cred) | |
1076 | cred->gc_principal = acred->principal; | |
0285ed1f | 1077 | kref_get(&gss_auth->kref); |
1da177e4 LT |
1078 | return &cred->gc_base; |
1079 | ||
1080 | out_err: | |
632f0d05 | 1081 | dprintk("RPC: %s failed with error %d\n", __func__, err); |
1da177e4 LT |
1082 | return ERR_PTR(err); |
1083 | } | |
1084 | ||
fba3bad4 TM |
1085 | static int |
1086 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
1087 | { | |
1088 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1089 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
1090 | int err; | |
1091 | ||
1092 | do { | |
1093 | err = gss_create_upcall(gss_auth, gss_cred); | |
1094 | } while (err == -EAGAIN); | |
1095 | return err; | |
1096 | } | |
1097 | ||
1da177e4 | 1098 | static int |
8a317760 | 1099 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
1100 | { |
1101 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
1102 | ||
cd019f75 | 1103 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 1104 | goto out; |
1da177e4 | 1105 | /* Don't match with creds that have expired. */ |
cd019f75 TM |
1106 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
1107 | return 0; | |
1108 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1da177e4 | 1109 | return 0; |
8a317760 | 1110 | out: |
68c97153 TM |
1111 | if (acred->principal != NULL) { |
1112 | if (gss_cred->gc_principal == NULL) | |
1113 | return 0; | |
1114 | return strcmp(acred->principal, gss_cred->gc_principal) == 0; | |
1115 | } | |
1116 | if (gss_cred->gc_principal != NULL) | |
7c67db3a | 1117 | return 0; |
a02cec21 | 1118 | return rc->cr_uid == acred->uid; |
1da177e4 LT |
1119 | } |
1120 | ||
1121 | /* | |
1122 | * Marshal credentials. | |
1123 | * Maybe we should keep a cached credential for performance reasons. | |
1124 | */ | |
d8ed029d AD |
1125 | static __be32 * |
1126 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1127 | { |
a17c2153 TM |
1128 | struct rpc_rqst *req = task->tk_rqstp; |
1129 | struct rpc_cred *cred = req->rq_cred; | |
1da177e4 LT |
1130 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1131 | gc_base); | |
1132 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1133 | __be32 *cred_len; |
1da177e4 LT |
1134 | u32 maj_stat = 0; |
1135 | struct xdr_netobj mic; | |
1136 | struct kvec iov; | |
1137 | struct xdr_buf verf_buf; | |
1138 | ||
632f0d05 | 1139 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1140 | |
1141 | *p++ = htonl(RPC_AUTH_GSS); | |
1142 | cred_len = p++; | |
1143 | ||
1144 | spin_lock(&ctx->gc_seq_lock); | |
1145 | req->rq_seqno = ctx->gc_seq++; | |
1146 | spin_unlock(&ctx->gc_seq_lock); | |
1147 | ||
1148 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
1149 | *p++ = htonl((u32) ctx->gc_proc); | |
1150 | *p++ = htonl((u32) req->rq_seqno); | |
1151 | *p++ = htonl((u32) gss_cred->gc_service); | |
1152 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
1153 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
1154 | ||
1155 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
1156 | * starting with the xid and ending at the end of the credential: */ | |
808012fb CL |
1157 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
1158 | req->rq_snd_buf.head[0].iov_base); | |
1da177e4 LT |
1159 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
1160 | xdr_buf_from_iov(&iov, &verf_buf); | |
1161 | ||
1162 | /* set verifier flavor*/ | |
1163 | *p++ = htonl(RPC_AUTH_GSS); | |
1164 | ||
1165 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 1166 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1167 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 1168 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1169 | } else if (maj_stat != 0) { |
1170 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
1171 | goto out_put_ctx; | |
1172 | } | |
1173 | p = xdr_encode_opaque(p, NULL, mic.len); | |
1174 | gss_put_ctx(ctx); | |
1175 | return p; | |
1176 | out_put_ctx: | |
1177 | gss_put_ctx(ctx); | |
1178 | return NULL; | |
1179 | } | |
1180 | ||
cd019f75 TM |
1181 | static int gss_renew_cred(struct rpc_task *task) |
1182 | { | |
a17c2153 | 1183 | struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1184 | struct gss_cred *gss_cred = container_of(oldcred, |
1185 | struct gss_cred, | |
1186 | gc_base); | |
1187 | struct rpc_auth *auth = oldcred->cr_auth; | |
1188 | struct auth_cred acred = { | |
1189 | .uid = oldcred->cr_uid, | |
68c97153 TM |
1190 | .principal = gss_cred->gc_principal, |
1191 | .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), | |
cd019f75 TM |
1192 | }; |
1193 | struct rpc_cred *new; | |
1194 | ||
1195 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
1196 | if (IS_ERR(new)) | |
1197 | return PTR_ERR(new); | |
a17c2153 | 1198 | task->tk_rqstp->rq_cred = new; |
cd019f75 TM |
1199 | put_rpccred(oldcred); |
1200 | return 0; | |
1201 | } | |
1202 | ||
126e216a TM |
1203 | static int gss_cred_is_negative_entry(struct rpc_cred *cred) |
1204 | { | |
1205 | if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { | |
1206 | unsigned long now = jiffies; | |
1207 | unsigned long begin, expire; | |
1208 | struct gss_cred *gss_cred; | |
1209 | ||
1210 | gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1211 | begin = gss_cred->gc_upcall_timestamp; | |
1212 | expire = begin + gss_expired_cred_retry_delay * HZ; | |
1213 | ||
1214 | if (time_in_range_open(now, begin, expire)) | |
1215 | return 1; | |
1216 | } | |
1217 | return 0; | |
1218 | } | |
1219 | ||
1da177e4 LT |
1220 | /* |
1221 | * Refresh credentials. XXX - finish | |
1222 | */ | |
1223 | static int | |
1224 | gss_refresh(struct rpc_task *task) | |
1225 | { | |
a17c2153 | 1226 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1227 | int ret = 0; |
1228 | ||
126e216a TM |
1229 | if (gss_cred_is_negative_entry(cred)) |
1230 | return -EKEYEXPIRED; | |
1231 | ||
cd019f75 TM |
1232 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
1233 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
1234 | ret = gss_renew_cred(task); | |
1235 | if (ret < 0) | |
1236 | goto out; | |
a17c2153 | 1237 | cred = task->tk_rqstp->rq_cred; |
cd019f75 | 1238 | } |
1da177e4 | 1239 | |
cd019f75 TM |
1240 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
1241 | ret = gss_refresh_upcall(task); | |
1242 | out: | |
1243 | return ret; | |
1da177e4 LT |
1244 | } |
1245 | ||
0df7fb74 TM |
1246 | /* Dummy refresh routine: used only when destroying the context */ |
1247 | static int | |
1248 | gss_refresh_null(struct rpc_task *task) | |
1249 | { | |
1250 | return -EACCES; | |
1251 | } | |
1252 | ||
d8ed029d AD |
1253 | static __be32 * |
1254 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1255 | { |
a17c2153 | 1256 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 | 1257 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 1258 | __be32 seq; |
1da177e4 LT |
1259 | struct kvec iov; |
1260 | struct xdr_buf verf_buf; | |
1261 | struct xdr_netobj mic; | |
1262 | u32 flav,len; | |
1263 | u32 maj_stat; | |
1264 | ||
632f0d05 | 1265 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1266 | |
1267 | flav = ntohl(*p++); | |
1268 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 1269 | goto out_bad; |
1da177e4 LT |
1270 | if (flav != RPC_AUTH_GSS) |
1271 | goto out_bad; | |
1272 | seq = htonl(task->tk_rqstp->rq_seqno); | |
1273 | iov.iov_base = &seq; | |
1274 | iov.iov_len = sizeof(seq); | |
1275 | xdr_buf_from_iov(&iov, &verf_buf); | |
1276 | mic.data = (u8 *)p; | |
1277 | mic.len = len; | |
1278 | ||
00fd6e14 | 1279 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1280 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1281 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 1282 | if (maj_stat) { |
632f0d05 CL |
1283 | dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", |
1284 | task->tk_pid, __func__, maj_stat); | |
1da177e4 | 1285 | goto out_bad; |
0df7fb74 | 1286 | } |
24b2605b BF |
1287 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1288 | * calculate the length of the verifier: */ | |
1be27f36 | 1289 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 1290 | gss_put_ctx(ctx); |
632f0d05 CL |
1291 | dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", |
1292 | task->tk_pid, __func__); | |
1da177e4 LT |
1293 | return p + XDR_QUADLEN(len); |
1294 | out_bad: | |
1295 | gss_put_ctx(ctx); | |
632f0d05 | 1296 | dprintk("RPC: %5u %s failed.\n", task->tk_pid, __func__); |
1da177e4 LT |
1297 | return NULL; |
1298 | } | |
1299 | ||
9f06c719 CL |
1300 | static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, |
1301 | __be32 *p, void *obj) | |
1302 | { | |
1303 | struct xdr_stream xdr; | |
1304 | ||
1305 | xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); | |
1306 | encode(rqstp, &xdr, obj); | |
1307 | } | |
1308 | ||
1da177e4 LT |
1309 | static inline int |
1310 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1311 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1312 | __be32 *p, void *obj) | |
1da177e4 LT |
1313 | { |
1314 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1315 | struct xdr_buf integ_buf; | |
d8ed029d | 1316 | __be32 *integ_len = NULL; |
1da177e4 | 1317 | struct xdr_netobj mic; |
d8ed029d AD |
1318 | u32 offset; |
1319 | __be32 *q; | |
1da177e4 LT |
1320 | struct kvec *iov; |
1321 | u32 maj_stat = 0; | |
1322 | int status = -EIO; | |
1323 | ||
1324 | integ_len = p++; | |
1325 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1326 | *p++ = htonl(rqstp->rq_seqno); | |
1327 | ||
9f06c719 | 1328 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1da177e4 LT |
1329 | |
1330 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1331 | offset, snd_buf->len - offset)) | |
1332 | return status; | |
1333 | *integ_len = htonl(integ_buf.len); | |
1334 | ||
1335 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1336 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1337 | iov = snd_buf->tail; |
1338 | else | |
1339 | iov = snd_buf->head; | |
1340 | p = iov->iov_base + iov->iov_len; | |
1341 | mic.data = (u8 *)(p + 1); | |
1342 | ||
00fd6e14 | 1343 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1344 | status = -EIO; /* XXX? */ |
1345 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1346 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1347 | else if (maj_stat) |
1348 | return status; | |
1349 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1350 | ||
1351 | offset = (u8 *)q - (u8 *)p; | |
1352 | iov->iov_len += offset; | |
1353 | snd_buf->len += offset; | |
1354 | return 0; | |
1355 | } | |
1356 | ||
2d2da60c BF |
1357 | static void |
1358 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1359 | { | |
1360 | int i; | |
1361 | ||
1362 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1363 | __free_page(rqstp->rq_enc_pages[i]); | |
1364 | kfree(rqstp->rq_enc_pages); | |
1365 | } | |
1366 | ||
1367 | static int | |
1368 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1369 | { | |
1370 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1371 | int first, last, i; | |
1372 | ||
1373 | if (snd_buf->page_len == 0) { | |
1374 | rqstp->rq_enc_pages_num = 0; | |
1375 | return 0; | |
1376 | } | |
1377 | ||
1378 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1379 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1380 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1381 | rqstp->rq_enc_pages | |
1382 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1383 | GFP_NOFS); | |
1384 | if (!rqstp->rq_enc_pages) | |
1385 | goto out; | |
1386 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1387 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1388 | if (rqstp->rq_enc_pages[i] == NULL) | |
1389 | goto out_free; | |
1390 | } | |
1391 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1392 | return 0; | |
1393 | out_free: | |
cdead7cf TM |
1394 | rqstp->rq_enc_pages_num = i; |
1395 | priv_release_snd_buf(rqstp); | |
2d2da60c BF |
1396 | out: |
1397 | return -EAGAIN; | |
1398 | } | |
1399 | ||
1400 | static inline int | |
1401 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1402 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1403 | __be32 *p, void *obj) | |
2d2da60c BF |
1404 | { |
1405 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1406 | u32 offset; | |
1407 | u32 maj_stat; | |
1408 | int status; | |
d8ed029d | 1409 | __be32 *opaque_len; |
2d2da60c BF |
1410 | struct page **inpages; |
1411 | int first; | |
1412 | int pad; | |
1413 | struct kvec *iov; | |
1414 | char *tmp; | |
1415 | ||
1416 | opaque_len = p++; | |
1417 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1418 | *p++ = htonl(rqstp->rq_seqno); | |
1419 | ||
9f06c719 | 1420 | gss_wrap_req_encode(encode, rqstp, p, obj); |
2d2da60c BF |
1421 | |
1422 | status = alloc_enc_pages(rqstp); | |
1423 | if (status) | |
1424 | return status; | |
1425 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1426 | inpages = snd_buf->pages + first; | |
1427 | snd_buf->pages = rqstp->rq_enc_pages; | |
1428 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
7561042f KC |
1429 | /* |
1430 | * Give the tail its own page, in case we need extra space in the | |
1431 | * head when wrapping: | |
1432 | * | |
1433 | * call_allocate() allocates twice the slack space required | |
1434 | * by the authentication flavor to rq_callsize. | |
1435 | * For GSS, slack is GSS_CRED_SLACK. | |
1436 | */ | |
2d2da60c BF |
1437 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
1438 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1439 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1440 | snd_buf->tail[0].iov_base = tmp; | |
1441 | } | |
00fd6e14 | 1442 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
7561042f | 1443 | /* slack space should prevent this ever happening: */ |
2d2da60c | 1444 | BUG_ON(snd_buf->len > snd_buf->buflen); |
cca5172a | 1445 | status = -EIO; |
2d2da60c BF |
1446 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1447 | * done anyway, so it's safe to put the request on the wire: */ | |
1448 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1449 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1450 | else if (maj_stat) |
1451 | return status; | |
1452 | ||
1453 | *opaque_len = htonl(snd_buf->len - offset); | |
1454 | /* guess whether we're in the head or the tail: */ | |
1455 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1456 | iov = snd_buf->tail; | |
1457 | else | |
1458 | iov = snd_buf->head; | |
1459 | p = iov->iov_base + iov->iov_len; | |
1460 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1461 | memset(p, 0, pad); | |
1462 | iov->iov_len += pad; | |
1463 | snd_buf->len += pad; | |
1464 | ||
1465 | return 0; | |
1466 | } | |
1467 | ||
1da177e4 LT |
1468 | static int |
1469 | gss_wrap_req(struct rpc_task *task, | |
9f06c719 | 1470 | kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1471 | { |
a17c2153 | 1472 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1473 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1474 | gc_base); | |
1475 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1476 | int status = -EIO; | |
1477 | ||
632f0d05 | 1478 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1479 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1480 | /* The spec seems a little ambiguous here, but I think that not | |
1481 | * wrapping context destruction requests makes the most sense. | |
1482 | */ | |
9f06c719 CL |
1483 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1484 | status = 0; | |
1da177e4 LT |
1485 | goto out; |
1486 | } | |
1487 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1488 | case RPC_GSS_SVC_NONE: |
1489 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1490 | status = 0; | |
1491 | break; | |
1492 | case RPC_GSS_SVC_INTEGRITY: | |
1493 | status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); | |
1494 | break; | |
1495 | case RPC_GSS_SVC_PRIVACY: | |
1496 | status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); | |
1497 | break; | |
1da177e4 LT |
1498 | } |
1499 | out: | |
1500 | gss_put_ctx(ctx); | |
632f0d05 | 1501 | dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); |
1da177e4 LT |
1502 | return status; |
1503 | } | |
1504 | ||
1505 | static inline int | |
1506 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1507 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1508 | { |
1509 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1510 | struct xdr_buf integ_buf; | |
1511 | struct xdr_netobj mic; | |
1512 | u32 data_offset, mic_offset; | |
1513 | u32 integ_len; | |
1514 | u32 maj_stat; | |
1515 | int status = -EIO; | |
1516 | ||
1517 | integ_len = ntohl(*(*p)++); | |
1518 | if (integ_len & 3) | |
1519 | return status; | |
1520 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1521 | mic_offset = integ_len + data_offset; | |
1522 | if (mic_offset > rcv_buf->len) | |
1523 | return status; | |
1524 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1525 | return status; | |
1526 | ||
1527 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1528 | mic_offset - data_offset)) | |
1529 | return status; | |
1530 | ||
1531 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1532 | return status; | |
1533 | ||
00fd6e14 | 1534 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1535 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1536 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1537 | if (maj_stat != GSS_S_COMPLETE) |
1538 | return status; | |
1539 | return 0; | |
1540 | } | |
1541 | ||
2d2da60c BF |
1542 | static inline int |
1543 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1544 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1545 | { |
1546 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1547 | u32 offset; | |
1548 | u32 opaque_len; | |
1549 | u32 maj_stat; | |
1550 | int status = -EIO; | |
1551 | ||
1552 | opaque_len = ntohl(*(*p)++); | |
1553 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1554 | if (offset + opaque_len > rcv_buf->len) | |
1555 | return status; | |
1556 | /* remove padding: */ | |
1557 | rcv_buf->len = offset + opaque_len; | |
1558 | ||
00fd6e14 | 1559 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1560 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1561 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1562 | if (maj_stat != GSS_S_COMPLETE) |
1563 | return status; | |
1564 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1565 | return status; | |
1566 | ||
1567 | return 0; | |
1568 | } | |
1569 | ||
bf269551 CL |
1570 | static int |
1571 | gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, | |
1572 | __be32 *p, void *obj) | |
1573 | { | |
1574 | struct xdr_stream xdr; | |
1575 | ||
1576 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
1577 | return decode(rqstp, &xdr, obj); | |
1578 | } | |
2d2da60c | 1579 | |
1da177e4 LT |
1580 | static int |
1581 | gss_unwrap_resp(struct rpc_task *task, | |
bf269551 | 1582 | kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1583 | { |
a17c2153 | 1584 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1585 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1586 | gc_base); | |
1587 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1588 | __be32 *savedp = p; |
2d2da60c BF |
1589 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1590 | int savedlen = head->iov_len; | |
1da177e4 LT |
1591 | int status = -EIO; |
1592 | ||
1593 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1594 | goto out_decode; | |
1595 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1596 | case RPC_GSS_SVC_NONE: |
1597 | break; | |
1598 | case RPC_GSS_SVC_INTEGRITY: | |
1599 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1600 | if (status) | |
1601 | goto out; | |
1602 | break; | |
1603 | case RPC_GSS_SVC_PRIVACY: | |
1604 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); | |
1605 | if (status) | |
1606 | goto out; | |
1607 | break; | |
1da177e4 | 1608 | } |
24b2605b | 1609 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 1610 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 1611 | + (savedlen - head->iov_len); |
1da177e4 | 1612 | out_decode: |
bf269551 | 1613 | status = gss_unwrap_req_decode(decode, rqstp, p, obj); |
1da177e4 LT |
1614 | out: |
1615 | gss_put_ctx(ctx); | |
632f0d05 CL |
1616 | dprintk("RPC: %5u %s returning %d\n", |
1617 | task->tk_pid, __func__, status); | |
1da177e4 LT |
1618 | return status; |
1619 | } | |
cca5172a | 1620 | |
f1c0a861 | 1621 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1622 | .owner = THIS_MODULE, |
1623 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 1624 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
1625 | .create = gss_create, |
1626 | .destroy = gss_destroy, | |
1627 | .lookup_cred = gss_lookup_cred, | |
80df9d20 SK |
1628 | .crcreate = gss_create_cred, |
1629 | .pipes_create = gss_pipes_dentries_create, | |
1630 | .pipes_destroy = gss_pipes_dentries_destroy, | |
6a1a1e34 | 1631 | .list_pseudoflavors = gss_mech_list_pseudoflavors, |
1da177e4 LT |
1632 | }; |
1633 | ||
f1c0a861 | 1634 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1635 | .cr_name = "AUTH_GSS", |
1636 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1637 | .cr_init = gss_cred_init, |
5c691044 | 1638 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
1639 | .crmatch = gss_match, |
1640 | .crmarshal = gss_marshal, | |
1641 | .crrefresh = gss_refresh, | |
1642 | .crvalidate = gss_validate, | |
1643 | .crwrap_req = gss_wrap_req, | |
1644 | .crunwrap_resp = gss_unwrap_resp, | |
1645 | }; | |
1646 | ||
0df7fb74 TM |
1647 | static const struct rpc_credops gss_nullops = { |
1648 | .cr_name = "AUTH_GSS", | |
6dcd3926 | 1649 | .crdestroy = gss_destroy_nullcred, |
5c691044 | 1650 | .crbind = rpcauth_generic_bind_cred, |
0df7fb74 TM |
1651 | .crmatch = gss_match, |
1652 | .crmarshal = gss_marshal, | |
1653 | .crrefresh = gss_refresh_null, | |
1654 | .crvalidate = gss_validate, | |
1655 | .crwrap_req = gss_wrap_req, | |
1656 | .crunwrap_resp = gss_unwrap_resp, | |
1657 | }; | |
1658 | ||
b693ba4a | 1659 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
c1225158 | 1660 | .upcall = rpc_pipe_generic_upcall, |
34769fc4 BF |
1661 | .downcall = gss_pipe_downcall, |
1662 | .destroy_msg = gss_pipe_destroy_msg, | |
1663 | .open_pipe = gss_pipe_open_v0, | |
1664 | .release_pipe = gss_pipe_release, | |
1665 | }; | |
1666 | ||
b693ba4a | 1667 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
c1225158 | 1668 | .upcall = rpc_pipe_generic_upcall, |
1da177e4 LT |
1669 | .downcall = gss_pipe_downcall, |
1670 | .destroy_msg = gss_pipe_destroy_msg, | |
34769fc4 | 1671 | .open_pipe = gss_pipe_open_v1, |
1da177e4 LT |
1672 | .release_pipe = gss_pipe_release, |
1673 | }; | |
1674 | ||
a1db410d SK |
1675 | static __net_init int rpcsec_gss_init_net(struct net *net) |
1676 | { | |
1677 | return gss_svc_init_net(net); | |
1678 | } | |
1679 | ||
1680 | static __net_exit void rpcsec_gss_exit_net(struct net *net) | |
1681 | { | |
1682 | gss_svc_shutdown_net(net); | |
1683 | } | |
1684 | ||
1685 | static struct pernet_operations rpcsec_gss_net_ops = { | |
1686 | .init = rpcsec_gss_init_net, | |
1687 | .exit = rpcsec_gss_exit_net, | |
1688 | }; | |
1689 | ||
1da177e4 LT |
1690 | /* |
1691 | * Initialize RPCSEC_GSS module | |
1692 | */ | |
1693 | static int __init init_rpcsec_gss(void) | |
1694 | { | |
1695 | int err = 0; | |
1696 | ||
1697 | err = rpcauth_register(&authgss_ops); | |
1698 | if (err) | |
1699 | goto out; | |
1700 | err = gss_svc_init(); | |
1701 | if (err) | |
1702 | goto out_unregister; | |
a1db410d SK |
1703 | err = register_pernet_subsys(&rpcsec_gss_net_ops); |
1704 | if (err) | |
1705 | goto out_svc_exit; | |
79a3f20b | 1706 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
1da177e4 | 1707 | return 0; |
a1db410d SK |
1708 | out_svc_exit: |
1709 | gss_svc_shutdown(); | |
1da177e4 LT |
1710 | out_unregister: |
1711 | rpcauth_unregister(&authgss_ops); | |
1712 | out: | |
1713 | return err; | |
1714 | } | |
1715 | ||
1716 | static void __exit exit_rpcsec_gss(void) | |
1717 | { | |
a1db410d | 1718 | unregister_pernet_subsys(&rpcsec_gss_net_ops); |
1da177e4 LT |
1719 | gss_svc_shutdown(); |
1720 | rpcauth_unregister(&authgss_ops); | |
bf12691d | 1721 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1722 | } |
1723 | ||
1724 | MODULE_LICENSE("GPL"); | |
126e216a TM |
1725 | module_param_named(expired_cred_retry_delay, |
1726 | gss_expired_cred_retry_delay, | |
1727 | uint, 0644); | |
1728 | MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " | |
1729 | "the RPC engine retries an expired credential"); | |
1730 | ||
1da177e4 LT |
1731 | module_init(init_rpcsec_gss) |
1732 | module_exit(exit_rpcsec_gss) |