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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 | */ | |
84 | struct dentry *dentry[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 | |
115 | * and a new one is protected by the inode->i_lock. | |
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; | |
5b7ddd4a | 254 | struct rpc_inode *inode; |
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 * | |
6e84c7b6 | 297 | __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) |
1da177e4 LT |
298 | { |
299 | struct gss_upcall_msg *pos; | |
6e84c7b6 | 300 | list_for_each_entry(pos, &rpci->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 | { |
5b7ddd4a BF |
318 | struct rpc_inode *rpci = gss_msg->inode; |
319 | struct inode *inode = &rpci->vfs_inode; | |
1da177e4 LT |
320 | struct gss_upcall_msg *old; |
321 | ||
b185f835 | 322 | spin_lock(&inode->i_lock); |
6e84c7b6 | 323 | old = __gss_find_upcall(rpci, gss_msg->uid); |
1da177e4 LT |
324 | if (old == NULL) { |
325 | atomic_inc(&gss_msg->count); | |
6e84c7b6 | 326 | list_add(&gss_msg->list, &rpci->in_downcall); |
1da177e4 LT |
327 | } else |
328 | gss_msg = old; | |
b185f835 | 329 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
330 | return gss_msg; |
331 | } | |
332 | ||
333 | static void | |
334 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
335 | { | |
1da177e4 LT |
336 | list_del_init(&gss_msg->list); |
337 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
338 | wake_up_all(&gss_msg->waitqueue); | |
339 | atomic_dec(&gss_msg->count); | |
340 | } | |
341 | ||
342 | static void | |
343 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
344 | { | |
5b7ddd4a | 345 | struct inode *inode = &gss_msg->inode->vfs_inode; |
1da177e4 | 346 | |
3b68aaea TM |
347 | if (list_empty(&gss_msg->list)) |
348 | return; | |
b185f835 | 349 | spin_lock(&inode->i_lock); |
3b68aaea TM |
350 | if (!list_empty(&gss_msg->list)) |
351 | __gss_unhash_msg(gss_msg); | |
b185f835 | 352 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
353 | } |
354 | ||
126e216a TM |
355 | static void |
356 | gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) | |
357 | { | |
358 | switch (gss_msg->msg.errno) { | |
359 | case 0: | |
360 | if (gss_msg->ctx == NULL) | |
361 | break; | |
362 | clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
363 | gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); | |
364 | break; | |
365 | case -EKEYEXPIRED: | |
366 | set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
367 | } | |
368 | gss_cred->gc_upcall_timestamp = jiffies; | |
369 | gss_cred->gc_upcall = NULL; | |
370 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
371 | } | |
372 | ||
1da177e4 LT |
373 | static void |
374 | gss_upcall_callback(struct rpc_task *task) | |
375 | { | |
a17c2153 | 376 | struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, |
1da177e4 LT |
377 | struct gss_cred, gc_base); |
378 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
5b7ddd4a | 379 | struct inode *inode = &gss_msg->inode->vfs_inode; |
1da177e4 | 380 | |
5d28dc82 | 381 | spin_lock(&inode->i_lock); |
126e216a | 382 | gss_handle_downcall_result(gss_cred, gss_msg); |
b185f835 | 383 | spin_unlock(&inode->i_lock); |
126e216a | 384 | task->tk_status = gss_msg->msg.errno; |
1da177e4 LT |
385 | gss_release_msg(gss_msg); |
386 | } | |
387 | ||
34769fc4 BF |
388 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) |
389 | { | |
390 | gss_msg->msg.data = &gss_msg->uid; | |
391 | gss_msg->msg.len = sizeof(gss_msg->uid); | |
392 | } | |
393 | ||
8b1c7bf5 | 394 | static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
2efef708 | 395 | struct rpc_clnt *clnt, int machine_cred) |
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 | } | |
2efef708 OK |
410 | if (machine_cred) { |
411 | len = sprintf(p, "service=* "); | |
412 | p += len; | |
413 | gss_msg->msg.len += len; | |
414 | } else if (!strcmp(clnt->cl_program->name, "nfs4_cb")) { | |
415 | len = sprintf(p, "service=nfs "); | |
416 | p += len; | |
417 | gss_msg->msg.len += len; | |
418 | } | |
683ac665 | 419 | if (mech->gm_upcall_enctypes) { |
f8628220 | 420 | len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes); |
683ac665 TM |
421 | p += len; |
422 | gss_msg->msg.len += len; | |
423 | } | |
8b1c7bf5 OK |
424 | len = sprintf(p, "\n"); |
425 | gss_msg->msg.len += len; | |
426 | ||
34769fc4 BF |
427 | gss_msg->msg.data = gss_msg->databuf; |
428 | BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN); | |
429 | } | |
430 | ||
8b1c7bf5 | 431 | static void gss_encode_msg(struct gss_upcall_msg *gss_msg, |
2efef708 | 432 | struct rpc_clnt *clnt, int machine_cred) |
34769fc4 BF |
433 | { |
434 | if (pipe_version == 0) | |
435 | gss_encode_v0_msg(gss_msg); | |
436 | else /* pipe_version == 1 */ | |
2efef708 | 437 | gss_encode_v1_msg(gss_msg, clnt, machine_cred); |
34769fc4 BF |
438 | } |
439 | ||
1da177e4 | 440 | static inline struct gss_upcall_msg * |
2efef708 OK |
441 | gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid, struct rpc_clnt *clnt, |
442 | int machine_cred) | |
1da177e4 LT |
443 | { |
444 | struct gss_upcall_msg *gss_msg; | |
79a3f20b | 445 | int vers; |
1da177e4 | 446 | |
0f38b873 | 447 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
db75b3d6 BF |
448 | if (gss_msg == NULL) |
449 | return ERR_PTR(-ENOMEM); | |
79a3f20b BF |
450 | vers = get_pipe_version(); |
451 | if (vers < 0) { | |
452 | kfree(gss_msg); | |
453 | return ERR_PTR(vers); | |
454 | } | |
34769fc4 | 455 | gss_msg->inode = RPC_I(gss_auth->dentry[vers]->d_inode); |
db75b3d6 BF |
456 | INIT_LIST_HEAD(&gss_msg->list); |
457 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
458 | init_waitqueue_head(&gss_msg->waitqueue); | |
459 | atomic_set(&gss_msg->count, 1); | |
db75b3d6 BF |
460 | gss_msg->uid = uid; |
461 | gss_msg->auth = gss_auth; | |
2efef708 | 462 | gss_encode_msg(gss_msg, clnt, machine_cred); |
1da177e4 LT |
463 | return gss_msg; |
464 | } | |
465 | ||
466 | static struct gss_upcall_msg * | |
467 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
468 | { | |
7c67db3a TM |
469 | struct gss_cred *gss_cred = container_of(cred, |
470 | struct gss_cred, gc_base); | |
1da177e4 | 471 | struct gss_upcall_msg *gss_new, *gss_msg; |
7c67db3a | 472 | uid_t uid = cred->cr_uid; |
1da177e4 | 473 | |
2efef708 | 474 | gss_new = gss_alloc_msg(gss_auth, uid, clnt, gss_cred->gc_machine_cred); |
db75b3d6 BF |
475 | if (IS_ERR(gss_new)) |
476 | return gss_new; | |
053e324f | 477 | gss_msg = gss_add_msg(gss_new); |
1da177e4 | 478 | if (gss_msg == gss_new) { |
5b7ddd4a BF |
479 | struct inode *inode = &gss_new->inode->vfs_inode; |
480 | int res = rpc_queue_upcall(inode, &gss_new->msg); | |
1da177e4 LT |
481 | if (res) { |
482 | gss_unhash_msg(gss_new); | |
483 | gss_msg = ERR_PTR(res); | |
484 | } | |
485 | } else | |
486 | gss_release_msg(gss_new); | |
487 | return gss_msg; | |
488 | } | |
489 | ||
b03568c3 BF |
490 | static void warn_gssd(void) |
491 | { | |
492 | static unsigned long ratelimit; | |
493 | unsigned long now = jiffies; | |
494 | ||
495 | if (time_after(now, ratelimit)) { | |
496 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" | |
497 | "Please check user daemon is running.\n"); | |
498 | ratelimit = now + 15*HZ; | |
499 | } | |
500 | } | |
501 | ||
1da177e4 LT |
502 | static inline int |
503 | gss_refresh_upcall(struct rpc_task *task) | |
504 | { | |
a17c2153 | 505 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
4a8c1344 | 506 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
507 | struct gss_auth, rpc_auth); |
508 | struct gss_cred *gss_cred = container_of(cred, | |
509 | struct gss_cred, gc_base); | |
510 | struct gss_upcall_msg *gss_msg; | |
5b7ddd4a | 511 | struct inode *inode; |
1da177e4 LT |
512 | int err = 0; |
513 | ||
8885cb36 CL |
514 | dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, |
515 | cred->cr_uid); | |
1da177e4 | 516 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
480e3243 | 517 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
79a3f20b BF |
518 | /* XXX: warning on the first, under the assumption we |
519 | * shouldn't normally hit this case on a refresh. */ | |
520 | warn_gssd(); | |
521 | task->tk_timeout = 15*HZ; | |
522 | rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); | |
d1a8016a | 523 | return -EAGAIN; |
79a3f20b | 524 | } |
1da177e4 LT |
525 | if (IS_ERR(gss_msg)) { |
526 | err = PTR_ERR(gss_msg); | |
527 | goto out; | |
528 | } | |
5b7ddd4a | 529 | inode = &gss_msg->inode->vfs_inode; |
b185f835 | 530 | spin_lock(&inode->i_lock); |
1da177e4 | 531 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 532 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
126e216a | 533 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
1da177e4 LT |
534 | task->tk_timeout = 0; |
535 | gss_cred->gc_upcall = gss_msg; | |
536 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
537 | atomic_inc(&gss_msg->count); | |
5d00837b | 538 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
126e216a TM |
539 | } else { |
540 | gss_handle_downcall_result(gss_cred, gss_msg); | |
1da177e4 | 541 | err = gss_msg->msg.errno; |
126e216a | 542 | } |
b185f835 | 543 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
544 | gss_release_msg(gss_msg); |
545 | out: | |
8885cb36 CL |
546 | dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", |
547 | task->tk_pid, cred->cr_uid, err); | |
1da177e4 LT |
548 | return err; |
549 | } | |
550 | ||
551 | static inline int | |
552 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
553 | { | |
5b7ddd4a | 554 | struct inode *inode; |
1da177e4 LT |
555 | struct rpc_cred *cred = &gss_cred->gc_base; |
556 | struct gss_upcall_msg *gss_msg; | |
557 | DEFINE_WAIT(wait); | |
558 | int err = 0; | |
559 | ||
8885cb36 | 560 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); |
79a3f20b | 561 | retry: |
1da177e4 | 562 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
79a3f20b BF |
563 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
564 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, | |
565 | pipe_version >= 0, 15*HZ); | |
d1a8016a BS |
566 | if (pipe_version < 0) { |
567 | warn_gssd(); | |
568 | err = -EACCES; | |
569 | } | |
79a3f20b BF |
570 | if (err) |
571 | goto out; | |
79a3f20b BF |
572 | goto retry; |
573 | } | |
1da177e4 LT |
574 | if (IS_ERR(gss_msg)) { |
575 | err = PTR_ERR(gss_msg); | |
576 | goto out; | |
577 | } | |
5b7ddd4a | 578 | inode = &gss_msg->inode->vfs_inode; |
1da177e4 | 579 | for (;;) { |
5afa9133 | 580 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); |
b185f835 | 581 | spin_lock(&inode->i_lock); |
1da177e4 | 582 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
583 | break; |
584 | } | |
b185f835 | 585 | spin_unlock(&inode->i_lock); |
5afa9133 | 586 | if (fatal_signal_pending(current)) { |
1da177e4 LT |
587 | err = -ERESTARTSYS; |
588 | goto out_intr; | |
589 | } | |
590 | schedule(); | |
591 | } | |
592 | if (gss_msg->ctx) | |
7b6962b0 | 593 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
594 | else |
595 | err = gss_msg->msg.errno; | |
5d28dc82 | 596 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
597 | out_intr: |
598 | finish_wait(&gss_msg->waitqueue, &wait); | |
599 | gss_release_msg(gss_msg); | |
600 | out: | |
8885cb36 CL |
601 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", |
602 | cred->cr_uid, err); | |
1da177e4 LT |
603 | return err; |
604 | } | |
605 | ||
1da177e4 LT |
606 | #define MSG_BUF_MAXSIZE 1024 |
607 | ||
608 | static ssize_t | |
609 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
610 | { | |
611 | const void *p, *end; | |
612 | void *buf; | |
1da177e4 | 613 | struct gss_upcall_msg *gss_msg; |
b185f835 | 614 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
615 | struct gss_cl_ctx *ctx; |
616 | uid_t uid; | |
3b68aaea | 617 | ssize_t err = -EFBIG; |
1da177e4 LT |
618 | |
619 | if (mlen > MSG_BUF_MAXSIZE) | |
620 | goto out; | |
621 | err = -ENOMEM; | |
0f38b873 | 622 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
623 | if (!buf) |
624 | goto out; | |
625 | ||
1da177e4 LT |
626 | err = -EFAULT; |
627 | if (copy_from_user(buf, src, mlen)) | |
628 | goto err; | |
629 | ||
630 | end = (const void *)((char *)buf + mlen); | |
631 | p = simple_get_bytes(buf, end, &uid, sizeof(uid)); | |
632 | if (IS_ERR(p)) { | |
633 | err = PTR_ERR(p); | |
634 | goto err; | |
635 | } | |
636 | ||
637 | err = -ENOMEM; | |
638 | ctx = gss_alloc_context(); | |
639 | if (ctx == NULL) | |
640 | goto err; | |
3b68aaea TM |
641 | |
642 | err = -ENOENT; | |
643 | /* Find a matching upcall */ | |
3b68aaea | 644 | spin_lock(&inode->i_lock); |
6e84c7b6 | 645 | gss_msg = __gss_find_upcall(RPC_I(inode), uid); |
3b68aaea TM |
646 | if (gss_msg == NULL) { |
647 | spin_unlock(&inode->i_lock); | |
648 | goto err_put_ctx; | |
649 | } | |
650 | list_del_init(&gss_msg->list); | |
651 | spin_unlock(&inode->i_lock); | |
652 | ||
6e84c7b6 | 653 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
654 | if (IS_ERR(p)) { |
655 | err = PTR_ERR(p); | |
486bad2e JL |
656 | switch (err) { |
657 | case -EACCES: | |
dc5ddce9 | 658 | case -EKEYEXPIRED: |
486bad2e JL |
659 | gss_msg->msg.errno = err; |
660 | err = mlen; | |
661 | break; | |
662 | case -EFAULT: | |
663 | case -ENOMEM: | |
664 | case -EINVAL: | |
665 | case -ENOSYS: | |
666 | gss_msg->msg.errno = -EAGAIN; | |
667 | break; | |
668 | default: | |
669 | printk(KERN_CRIT "%s: bad return from " | |
6c853099 | 670 | "gss_fill_context: %zd\n", __func__, err); |
486bad2e JL |
671 | BUG(); |
672 | } | |
3b68aaea | 673 | goto err_release_msg; |
1da177e4 | 674 | } |
3b68aaea TM |
675 | gss_msg->ctx = gss_get_ctx(ctx); |
676 | err = mlen; | |
677 | ||
678 | err_release_msg: | |
b185f835 | 679 | spin_lock(&inode->i_lock); |
3b68aaea TM |
680 | __gss_unhash_msg(gss_msg); |
681 | spin_unlock(&inode->i_lock); | |
682 | gss_release_msg(gss_msg); | |
1da177e4 LT |
683 | err_put_ctx: |
684 | gss_put_ctx(ctx); | |
685 | err: | |
686 | kfree(buf); | |
687 | out: | |
3b68aaea | 688 | dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); |
1da177e4 LT |
689 | return err; |
690 | } | |
691 | ||
34769fc4 | 692 | static int gss_pipe_open(struct inode *inode, int new_version) |
cf81939d | 693 | { |
34769fc4 BF |
694 | int ret = 0; |
695 | ||
79a3f20b BF |
696 | spin_lock(&pipe_version_lock); |
697 | if (pipe_version < 0) { | |
34769fc4 BF |
698 | /* First open of any gss pipe determines the version: */ |
699 | pipe_version = new_version; | |
79a3f20b BF |
700 | rpc_wake_up(&pipe_version_rpc_waitqueue); |
701 | wake_up(&pipe_version_waitqueue); | |
34769fc4 BF |
702 | } else if (pipe_version != new_version) { |
703 | /* Trying to open a pipe of a different version */ | |
704 | ret = -EBUSY; | |
705 | goto out; | |
79a3f20b | 706 | } |
cf81939d | 707 | atomic_inc(&pipe_users); |
34769fc4 | 708 | out: |
79a3f20b | 709 | spin_unlock(&pipe_version_lock); |
34769fc4 BF |
710 | return ret; |
711 | ||
712 | } | |
713 | ||
714 | static int gss_pipe_open_v0(struct inode *inode) | |
715 | { | |
716 | return gss_pipe_open(inode, 0); | |
717 | } | |
718 | ||
719 | static int gss_pipe_open_v1(struct inode *inode) | |
720 | { | |
721 | return gss_pipe_open(inode, 1); | |
cf81939d BF |
722 | } |
723 | ||
1da177e4 LT |
724 | static void |
725 | gss_pipe_release(struct inode *inode) | |
726 | { | |
727 | struct rpc_inode *rpci = RPC_I(inode); | |
6e84c7b6 | 728 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 729 | |
5a67657a | 730 | restart: |
b185f835 | 731 | spin_lock(&inode->i_lock); |
5a67657a | 732 | list_for_each_entry(gss_msg, &rpci->in_downcall, list) { |
1da177e4 | 733 | |
5a67657a TM |
734 | if (!list_empty(&gss_msg->msg.list)) |
735 | continue; | |
1da177e4 LT |
736 | gss_msg->msg.errno = -EPIPE; |
737 | atomic_inc(&gss_msg->count); | |
738 | __gss_unhash_msg(gss_msg); | |
b185f835 | 739 | spin_unlock(&inode->i_lock); |
1da177e4 | 740 | gss_release_msg(gss_msg); |
5a67657a | 741 | goto restart; |
1da177e4 | 742 | } |
b185f835 | 743 | spin_unlock(&inode->i_lock); |
cf81939d | 744 | |
79a3f20b | 745 | put_pipe_version(); |
1da177e4 LT |
746 | } |
747 | ||
748 | static void | |
749 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
750 | { | |
751 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
1da177e4 LT |
752 | |
753 | if (msg->errno < 0) { | |
8885cb36 | 754 | dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", |
1da177e4 LT |
755 | gss_msg); |
756 | atomic_inc(&gss_msg->count); | |
757 | gss_unhash_msg(gss_msg); | |
b03568c3 BF |
758 | if (msg->errno == -ETIMEDOUT) |
759 | warn_gssd(); | |
1da177e4 LT |
760 | gss_release_msg(gss_msg); |
761 | } | |
762 | } | |
763 | ||
cca5172a YH |
764 | /* |
765 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
766 | * parameters based on the input flavor (which must be a pseudoflavor) |
767 | */ | |
768 | static struct rpc_auth * | |
769 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
770 | { | |
771 | struct gss_auth *gss_auth; | |
772 | struct rpc_auth * auth; | |
6a19275a | 773 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 774 | |
8885cb36 | 775 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
776 | |
777 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 778 | return ERR_PTR(err); |
1da177e4 LT |
779 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
780 | goto out_dec; | |
781 | gss_auth->client = clnt; | |
6a19275a | 782 | err = -EINVAL; |
1da177e4 LT |
783 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
784 | if (!gss_auth->mech) { | |
3392c349 | 785 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", |
0dc47877 | 786 | __func__, flavor); |
1da177e4 LT |
787 | goto err_free; |
788 | } | |
789 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
790 | if (gss_auth->service == 0) |
791 | goto err_put_mech; | |
1da177e4 LT |
792 | auth = &gss_auth->rpc_auth; |
793 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
794 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
795 | auth->au_ops = &authgss_ops; | |
796 | auth->au_flavor = flavor; | |
797 | atomic_set(&auth->au_count, 1); | |
0285ed1f | 798 | kref_init(&gss_auth->kref); |
1da177e4 | 799 | |
34769fc4 BF |
800 | /* |
801 | * Note: if we created the old pipe first, then someone who | |
802 | * examined the directory at the right moment might conclude | |
803 | * that we supported only the old pipe. So we instead create | |
804 | * the new pipe first. | |
805 | */ | |
7d217cac | 806 | gss_auth->dentry[1] = rpc_mkpipe(clnt->cl_path.dentry, |
34769fc4 BF |
807 | "gssd", |
808 | clnt, &gss_upcall_ops_v1, | |
809 | RPC_PIPE_WAIT_FOR_OPEN); | |
810 | if (IS_ERR(gss_auth->dentry[1])) { | |
811 | err = PTR_ERR(gss_auth->dentry[1]); | |
1da177e4 | 812 | goto err_put_mech; |
6a19275a | 813 | } |
1da177e4 | 814 | |
7d217cac | 815 | gss_auth->dentry[0] = rpc_mkpipe(clnt->cl_path.dentry, |
34769fc4 BF |
816 | gss_auth->mech->gm_name, |
817 | clnt, &gss_upcall_ops_v0, | |
818 | RPC_PIPE_WAIT_FOR_OPEN); | |
819 | if (IS_ERR(gss_auth->dentry[0])) { | |
820 | err = PTR_ERR(gss_auth->dentry[0]); | |
821 | goto err_unlink_pipe_1; | |
822 | } | |
f5c2187c | 823 | err = rpcauth_init_credcache(auth); |
07a2bf1d | 824 | if (err) |
34769fc4 | 825 | goto err_unlink_pipe_0; |
07a2bf1d | 826 | |
1da177e4 | 827 | return auth; |
34769fc4 BF |
828 | err_unlink_pipe_0: |
829 | rpc_unlink(gss_auth->dentry[0]); | |
830 | err_unlink_pipe_1: | |
831 | rpc_unlink(gss_auth->dentry[1]); | |
1da177e4 LT |
832 | err_put_mech: |
833 | gss_mech_put(gss_auth->mech); | |
834 | err_free: | |
835 | kfree(gss_auth); | |
836 | out_dec: | |
837 | module_put(THIS_MODULE); | |
6a19275a | 838 | return ERR_PTR(err); |
1da177e4 LT |
839 | } |
840 | ||
0285ed1f TM |
841 | static void |
842 | gss_free(struct gss_auth *gss_auth) | |
843 | { | |
34769fc4 BF |
844 | rpc_unlink(gss_auth->dentry[1]); |
845 | rpc_unlink(gss_auth->dentry[0]); | |
0285ed1f TM |
846 | gss_mech_put(gss_auth->mech); |
847 | ||
848 | kfree(gss_auth); | |
849 | module_put(THIS_MODULE); | |
850 | } | |
851 | ||
852 | static void | |
853 | gss_free_callback(struct kref *kref) | |
854 | { | |
855 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
856 | ||
857 | gss_free(gss_auth); | |
858 | } | |
859 | ||
1da177e4 LT |
860 | static void |
861 | gss_destroy(struct rpc_auth *auth) | |
862 | { | |
863 | struct gss_auth *gss_auth; | |
864 | ||
8885cb36 CL |
865 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
866 | auth, auth->au_flavor); | |
1da177e4 | 867 | |
3ab9bb72 TM |
868 | rpcauth_destroy_credcache(auth); |
869 | ||
1da177e4 | 870 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
0285ed1f | 871 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
872 | } |
873 | ||
0df7fb74 TM |
874 | /* |
875 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
876 | * to the server with the GSS control procedure field set to | |
877 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
878 | * all RPCSEC_GSS state associated with that context. | |
879 | */ | |
880 | static int | |
881 | gss_destroying_context(struct rpc_cred *cred) | |
882 | { | |
883 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
884 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
885 | struct rpc_task *task; | |
886 | ||
887 | if (gss_cred->gc_ctx == NULL || | |
6dcd3926 | 888 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
0df7fb74 TM |
889 | return 0; |
890 | ||
891 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
892 | cred->cr_ops = &gss_nullops; | |
893 | ||
894 | /* Take a reference to ensure the cred will be destroyed either | |
895 | * by the RPC call or by the put_rpccred() below */ | |
896 | get_rpccred(cred); | |
897 | ||
080a1f14 | 898 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
0df7fb74 TM |
899 | if (!IS_ERR(task)) |
900 | rpc_put_task(task); | |
901 | ||
902 | put_rpccred(cred); | |
903 | return 1; | |
904 | } | |
905 | ||
906 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
907 | * to create a new cred or context, so they check that things have been |
908 | * allocated before freeing them. */ | |
909 | static void | |
5d28dc82 | 910 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 911 | { |
5d28dc82 | 912 | dprintk("RPC: gss_free_ctx\n"); |
1da177e4 | 913 | |
0d8a3746 | 914 | gss_delete_sec_context(&ctx->gc_gss_ctx); |
1da177e4 LT |
915 | kfree(ctx->gc_wire_ctx.data); |
916 | kfree(ctx); | |
917 | } | |
918 | ||
5d28dc82 TM |
919 | static void |
920 | gss_free_ctx_callback(struct rcu_head *head) | |
921 | { | |
922 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
923 | gss_do_free_ctx(ctx); | |
924 | } | |
925 | ||
926 | static void | |
927 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
928 | { | |
929 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); | |
930 | } | |
931 | ||
1da177e4 | 932 | static void |
31be5bf1 | 933 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 934 | { |
31be5bf1 | 935 | dprintk("RPC: gss_free_cred %p\n", gss_cred); |
31be5bf1 TM |
936 | kfree(gss_cred); |
937 | } | |
1da177e4 | 938 | |
31be5bf1 TM |
939 | static void |
940 | gss_free_cred_callback(struct rcu_head *head) | |
941 | { | |
942 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
943 | gss_free_cred(gss_cred); | |
944 | } | |
1da177e4 | 945 | |
31be5bf1 | 946 | static void |
6dcd3926 | 947 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 948 | { |
5d28dc82 | 949 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 950 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
5d28dc82 TM |
951 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
952 | ||
a9b3cd7f | 953 | RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); |
31be5bf1 | 954 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
955 | if (ctx) |
956 | gss_put_ctx(ctx); | |
0285ed1f | 957 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
958 | } |
959 | ||
6dcd3926 JL |
960 | static void |
961 | gss_destroy_cred(struct rpc_cred *cred) | |
962 | { | |
963 | ||
964 | if (gss_destroying_context(cred)) | |
965 | return; | |
966 | gss_destroy_nullcred(cred); | |
967 | } | |
968 | ||
1da177e4 LT |
969 | /* |
970 | * Lookup RPCSEC_GSS cred for the current process | |
971 | */ | |
972 | static struct rpc_cred * | |
8a317760 | 973 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 974 | { |
8a317760 | 975 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
976 | } |
977 | ||
978 | static struct rpc_cred * | |
8a317760 | 979 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
980 | { |
981 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
982 | struct gss_cred *cred = NULL; | |
983 | int err = -ENOMEM; | |
984 | ||
8885cb36 | 985 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", |
1da177e4 LT |
986 | acred->uid, auth->au_flavor); |
987 | ||
0f38b873 | 988 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
1da177e4 LT |
989 | goto out_err; |
990 | ||
5fe4755e | 991 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
992 | /* |
993 | * Note: in order to force a call to call_refresh(), we deliberately | |
994 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
995 | */ | |
fc432dd9 | 996 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 997 | cred->gc_service = gss_auth->service; |
7c67db3a | 998 | cred->gc_machine_cred = acred->machine_cred; |
0285ed1f | 999 | kref_get(&gss_auth->kref); |
1da177e4 LT |
1000 | return &cred->gc_base; |
1001 | ||
1002 | out_err: | |
8885cb36 | 1003 | dprintk("RPC: gss_create_cred failed with error %d\n", err); |
1da177e4 LT |
1004 | return ERR_PTR(err); |
1005 | } | |
1006 | ||
fba3bad4 TM |
1007 | static int |
1008 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
1009 | { | |
1010 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1011 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
1012 | int err; | |
1013 | ||
1014 | do { | |
1015 | err = gss_create_upcall(gss_auth, gss_cred); | |
1016 | } while (err == -EAGAIN); | |
1017 | return err; | |
1018 | } | |
1019 | ||
1da177e4 | 1020 | static int |
8a317760 | 1021 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
1022 | { |
1023 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
1024 | ||
cd019f75 | 1025 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 1026 | goto out; |
1da177e4 | 1027 | /* Don't match with creds that have expired. */ |
cd019f75 TM |
1028 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
1029 | return 0; | |
1030 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1da177e4 | 1031 | return 0; |
8a317760 | 1032 | out: |
7c67db3a TM |
1033 | if (acred->machine_cred != gss_cred->gc_machine_cred) |
1034 | return 0; | |
a02cec21 | 1035 | return rc->cr_uid == acred->uid; |
1da177e4 LT |
1036 | } |
1037 | ||
1038 | /* | |
1039 | * Marshal credentials. | |
1040 | * Maybe we should keep a cached credential for performance reasons. | |
1041 | */ | |
d8ed029d AD |
1042 | static __be32 * |
1043 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1044 | { |
a17c2153 TM |
1045 | struct rpc_rqst *req = task->tk_rqstp; |
1046 | struct rpc_cred *cred = req->rq_cred; | |
1da177e4 LT |
1047 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1048 | gc_base); | |
1049 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1050 | __be32 *cred_len; |
1da177e4 LT |
1051 | u32 maj_stat = 0; |
1052 | struct xdr_netobj mic; | |
1053 | struct kvec iov; | |
1054 | struct xdr_buf verf_buf; | |
1055 | ||
8885cb36 | 1056 | dprintk("RPC: %5u gss_marshal\n", task->tk_pid); |
1da177e4 LT |
1057 | |
1058 | *p++ = htonl(RPC_AUTH_GSS); | |
1059 | cred_len = p++; | |
1060 | ||
1061 | spin_lock(&ctx->gc_seq_lock); | |
1062 | req->rq_seqno = ctx->gc_seq++; | |
1063 | spin_unlock(&ctx->gc_seq_lock); | |
1064 | ||
1065 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
1066 | *p++ = htonl((u32) ctx->gc_proc); | |
1067 | *p++ = htonl((u32) req->rq_seqno); | |
1068 | *p++ = htonl((u32) gss_cred->gc_service); | |
1069 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
1070 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
1071 | ||
1072 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
1073 | * starting with the xid and ending at the end of the credential: */ | |
808012fb CL |
1074 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
1075 | req->rq_snd_buf.head[0].iov_base); | |
1da177e4 LT |
1076 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
1077 | xdr_buf_from_iov(&iov, &verf_buf); | |
1078 | ||
1079 | /* set verifier flavor*/ | |
1080 | *p++ = htonl(RPC_AUTH_GSS); | |
1081 | ||
1082 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 1083 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1084 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 1085 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1086 | } else if (maj_stat != 0) { |
1087 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
1088 | goto out_put_ctx; | |
1089 | } | |
1090 | p = xdr_encode_opaque(p, NULL, mic.len); | |
1091 | gss_put_ctx(ctx); | |
1092 | return p; | |
1093 | out_put_ctx: | |
1094 | gss_put_ctx(ctx); | |
1095 | return NULL; | |
1096 | } | |
1097 | ||
cd019f75 TM |
1098 | static int gss_renew_cred(struct rpc_task *task) |
1099 | { | |
a17c2153 | 1100 | struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1101 | struct gss_cred *gss_cred = container_of(oldcred, |
1102 | struct gss_cred, | |
1103 | gc_base); | |
1104 | struct rpc_auth *auth = oldcred->cr_auth; | |
1105 | struct auth_cred acred = { | |
1106 | .uid = oldcred->cr_uid, | |
1107 | .machine_cred = gss_cred->gc_machine_cred, | |
1108 | }; | |
1109 | struct rpc_cred *new; | |
1110 | ||
1111 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
1112 | if (IS_ERR(new)) | |
1113 | return PTR_ERR(new); | |
a17c2153 | 1114 | task->tk_rqstp->rq_cred = new; |
cd019f75 TM |
1115 | put_rpccred(oldcred); |
1116 | return 0; | |
1117 | } | |
1118 | ||
126e216a TM |
1119 | static int gss_cred_is_negative_entry(struct rpc_cred *cred) |
1120 | { | |
1121 | if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { | |
1122 | unsigned long now = jiffies; | |
1123 | unsigned long begin, expire; | |
1124 | struct gss_cred *gss_cred; | |
1125 | ||
1126 | gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1127 | begin = gss_cred->gc_upcall_timestamp; | |
1128 | expire = begin + gss_expired_cred_retry_delay * HZ; | |
1129 | ||
1130 | if (time_in_range_open(now, begin, expire)) | |
1131 | return 1; | |
1132 | } | |
1133 | return 0; | |
1134 | } | |
1135 | ||
1da177e4 LT |
1136 | /* |
1137 | * Refresh credentials. XXX - finish | |
1138 | */ | |
1139 | static int | |
1140 | gss_refresh(struct rpc_task *task) | |
1141 | { | |
a17c2153 | 1142 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1143 | int ret = 0; |
1144 | ||
126e216a TM |
1145 | if (gss_cred_is_negative_entry(cred)) |
1146 | return -EKEYEXPIRED; | |
1147 | ||
cd019f75 TM |
1148 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
1149 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
1150 | ret = gss_renew_cred(task); | |
1151 | if (ret < 0) | |
1152 | goto out; | |
a17c2153 | 1153 | cred = task->tk_rqstp->rq_cred; |
cd019f75 | 1154 | } |
1da177e4 | 1155 | |
cd019f75 TM |
1156 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
1157 | ret = gss_refresh_upcall(task); | |
1158 | out: | |
1159 | return ret; | |
1da177e4 LT |
1160 | } |
1161 | ||
0df7fb74 TM |
1162 | /* Dummy refresh routine: used only when destroying the context */ |
1163 | static int | |
1164 | gss_refresh_null(struct rpc_task *task) | |
1165 | { | |
1166 | return -EACCES; | |
1167 | } | |
1168 | ||
d8ed029d AD |
1169 | static __be32 * |
1170 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1171 | { |
a17c2153 | 1172 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 | 1173 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 1174 | __be32 seq; |
1da177e4 LT |
1175 | struct kvec iov; |
1176 | struct xdr_buf verf_buf; | |
1177 | struct xdr_netobj mic; | |
1178 | u32 flav,len; | |
1179 | u32 maj_stat; | |
1180 | ||
8885cb36 | 1181 | dprintk("RPC: %5u gss_validate\n", task->tk_pid); |
1da177e4 LT |
1182 | |
1183 | flav = ntohl(*p++); | |
1184 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 1185 | goto out_bad; |
1da177e4 LT |
1186 | if (flav != RPC_AUTH_GSS) |
1187 | goto out_bad; | |
1188 | seq = htonl(task->tk_rqstp->rq_seqno); | |
1189 | iov.iov_base = &seq; | |
1190 | iov.iov_len = sizeof(seq); | |
1191 | xdr_buf_from_iov(&iov, &verf_buf); | |
1192 | mic.data = (u8 *)p; | |
1193 | mic.len = len; | |
1194 | ||
00fd6e14 | 1195 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1196 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1197 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 1198 | if (maj_stat) { |
014313a9 | 1199 | dprintk("RPC: %5u gss_validate: gss_verify_mic returned " |
0df7fb74 | 1200 | "error 0x%08x\n", task->tk_pid, maj_stat); |
1da177e4 | 1201 | goto out_bad; |
0df7fb74 | 1202 | } |
24b2605b BF |
1203 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1204 | * calculate the length of the verifier: */ | |
1be27f36 | 1205 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 1206 | gss_put_ctx(ctx); |
8885cb36 | 1207 | dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", |
1da177e4 LT |
1208 | task->tk_pid); |
1209 | return p + XDR_QUADLEN(len); | |
1210 | out_bad: | |
1211 | gss_put_ctx(ctx); | |
8885cb36 | 1212 | dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); |
1da177e4 LT |
1213 | return NULL; |
1214 | } | |
1215 | ||
9f06c719 CL |
1216 | static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, |
1217 | __be32 *p, void *obj) | |
1218 | { | |
1219 | struct xdr_stream xdr; | |
1220 | ||
1221 | xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); | |
1222 | encode(rqstp, &xdr, obj); | |
1223 | } | |
1224 | ||
1da177e4 LT |
1225 | static inline int |
1226 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1227 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1228 | __be32 *p, void *obj) | |
1da177e4 LT |
1229 | { |
1230 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1231 | struct xdr_buf integ_buf; | |
d8ed029d | 1232 | __be32 *integ_len = NULL; |
1da177e4 | 1233 | struct xdr_netobj mic; |
d8ed029d AD |
1234 | u32 offset; |
1235 | __be32 *q; | |
1da177e4 LT |
1236 | struct kvec *iov; |
1237 | u32 maj_stat = 0; | |
1238 | int status = -EIO; | |
1239 | ||
1240 | integ_len = p++; | |
1241 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1242 | *p++ = htonl(rqstp->rq_seqno); | |
1243 | ||
9f06c719 | 1244 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1da177e4 LT |
1245 | |
1246 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1247 | offset, snd_buf->len - offset)) | |
1248 | return status; | |
1249 | *integ_len = htonl(integ_buf.len); | |
1250 | ||
1251 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1252 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1253 | iov = snd_buf->tail; |
1254 | else | |
1255 | iov = snd_buf->head; | |
1256 | p = iov->iov_base + iov->iov_len; | |
1257 | mic.data = (u8 *)(p + 1); | |
1258 | ||
00fd6e14 | 1259 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1260 | status = -EIO; /* XXX? */ |
1261 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1262 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1263 | else if (maj_stat) |
1264 | return status; | |
1265 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1266 | ||
1267 | offset = (u8 *)q - (u8 *)p; | |
1268 | iov->iov_len += offset; | |
1269 | snd_buf->len += offset; | |
1270 | return 0; | |
1271 | } | |
1272 | ||
2d2da60c BF |
1273 | static void |
1274 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1275 | { | |
1276 | int i; | |
1277 | ||
1278 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1279 | __free_page(rqstp->rq_enc_pages[i]); | |
1280 | kfree(rqstp->rq_enc_pages); | |
1281 | } | |
1282 | ||
1283 | static int | |
1284 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1285 | { | |
1286 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1287 | int first, last, i; | |
1288 | ||
1289 | if (snd_buf->page_len == 0) { | |
1290 | rqstp->rq_enc_pages_num = 0; | |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1295 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1296 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1297 | rqstp->rq_enc_pages | |
1298 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1299 | GFP_NOFS); | |
1300 | if (!rqstp->rq_enc_pages) | |
1301 | goto out; | |
1302 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1303 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1304 | if (rqstp->rq_enc_pages[i] == NULL) | |
1305 | goto out_free; | |
1306 | } | |
1307 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1308 | return 0; | |
1309 | out_free: | |
cdead7cf TM |
1310 | rqstp->rq_enc_pages_num = i; |
1311 | priv_release_snd_buf(rqstp); | |
2d2da60c BF |
1312 | out: |
1313 | return -EAGAIN; | |
1314 | } | |
1315 | ||
1316 | static inline int | |
1317 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1318 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1319 | __be32 *p, void *obj) | |
2d2da60c BF |
1320 | { |
1321 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1322 | u32 offset; | |
1323 | u32 maj_stat; | |
1324 | int status; | |
d8ed029d | 1325 | __be32 *opaque_len; |
2d2da60c BF |
1326 | struct page **inpages; |
1327 | int first; | |
1328 | int pad; | |
1329 | struct kvec *iov; | |
1330 | char *tmp; | |
1331 | ||
1332 | opaque_len = p++; | |
1333 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1334 | *p++ = htonl(rqstp->rq_seqno); | |
1335 | ||
9f06c719 | 1336 | gss_wrap_req_encode(encode, rqstp, p, obj); |
2d2da60c BF |
1337 | |
1338 | status = alloc_enc_pages(rqstp); | |
1339 | if (status) | |
1340 | return status; | |
1341 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1342 | inpages = snd_buf->pages + first; | |
1343 | snd_buf->pages = rqstp->rq_enc_pages; | |
1344 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
7561042f KC |
1345 | /* |
1346 | * Give the tail its own page, in case we need extra space in the | |
1347 | * head when wrapping: | |
1348 | * | |
1349 | * call_allocate() allocates twice the slack space required | |
1350 | * by the authentication flavor to rq_callsize. | |
1351 | * For GSS, slack is GSS_CRED_SLACK. | |
1352 | */ | |
2d2da60c BF |
1353 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
1354 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1355 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1356 | snd_buf->tail[0].iov_base = tmp; | |
1357 | } | |
00fd6e14 | 1358 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
7561042f | 1359 | /* slack space should prevent this ever happening: */ |
2d2da60c | 1360 | BUG_ON(snd_buf->len > snd_buf->buflen); |
cca5172a | 1361 | status = -EIO; |
2d2da60c BF |
1362 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1363 | * done anyway, so it's safe to put the request on the wire: */ | |
1364 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1365 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1366 | else if (maj_stat) |
1367 | return status; | |
1368 | ||
1369 | *opaque_len = htonl(snd_buf->len - offset); | |
1370 | /* guess whether we're in the head or the tail: */ | |
1371 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1372 | iov = snd_buf->tail; | |
1373 | else | |
1374 | iov = snd_buf->head; | |
1375 | p = iov->iov_base + iov->iov_len; | |
1376 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1377 | memset(p, 0, pad); | |
1378 | iov->iov_len += pad; | |
1379 | snd_buf->len += pad; | |
1380 | ||
1381 | return 0; | |
1382 | } | |
1383 | ||
1da177e4 LT |
1384 | static int |
1385 | gss_wrap_req(struct rpc_task *task, | |
9f06c719 | 1386 | kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1387 | { |
a17c2153 | 1388 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1389 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1390 | gc_base); | |
1391 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1392 | int status = -EIO; | |
1393 | ||
8885cb36 | 1394 | dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); |
1da177e4 LT |
1395 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1396 | /* The spec seems a little ambiguous here, but I think that not | |
1397 | * wrapping context destruction requests makes the most sense. | |
1398 | */ | |
9f06c719 CL |
1399 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1400 | status = 0; | |
1da177e4 LT |
1401 | goto out; |
1402 | } | |
1403 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1404 | case RPC_GSS_SVC_NONE: |
1405 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1406 | status = 0; | |
1407 | break; | |
1408 | case RPC_GSS_SVC_INTEGRITY: | |
1409 | status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); | |
1410 | break; | |
1411 | case RPC_GSS_SVC_PRIVACY: | |
1412 | status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); | |
1413 | break; | |
1da177e4 LT |
1414 | } |
1415 | out: | |
1416 | gss_put_ctx(ctx); | |
8885cb36 | 1417 | dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); |
1da177e4 LT |
1418 | return status; |
1419 | } | |
1420 | ||
1421 | static inline int | |
1422 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1423 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1424 | { |
1425 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1426 | struct xdr_buf integ_buf; | |
1427 | struct xdr_netobj mic; | |
1428 | u32 data_offset, mic_offset; | |
1429 | u32 integ_len; | |
1430 | u32 maj_stat; | |
1431 | int status = -EIO; | |
1432 | ||
1433 | integ_len = ntohl(*(*p)++); | |
1434 | if (integ_len & 3) | |
1435 | return status; | |
1436 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1437 | mic_offset = integ_len + data_offset; | |
1438 | if (mic_offset > rcv_buf->len) | |
1439 | return status; | |
1440 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1441 | return status; | |
1442 | ||
1443 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1444 | mic_offset - data_offset)) | |
1445 | return status; | |
1446 | ||
1447 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1448 | return status; | |
1449 | ||
00fd6e14 | 1450 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1451 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1452 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1453 | if (maj_stat != GSS_S_COMPLETE) |
1454 | return status; | |
1455 | return 0; | |
1456 | } | |
1457 | ||
2d2da60c BF |
1458 | static inline int |
1459 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1460 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1461 | { |
1462 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1463 | u32 offset; | |
1464 | u32 opaque_len; | |
1465 | u32 maj_stat; | |
1466 | int status = -EIO; | |
1467 | ||
1468 | opaque_len = ntohl(*(*p)++); | |
1469 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1470 | if (offset + opaque_len > rcv_buf->len) | |
1471 | return status; | |
1472 | /* remove padding: */ | |
1473 | rcv_buf->len = offset + opaque_len; | |
1474 | ||
00fd6e14 | 1475 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1476 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1477 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1478 | if (maj_stat != GSS_S_COMPLETE) |
1479 | return status; | |
1480 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1481 | return status; | |
1482 | ||
1483 | return 0; | |
1484 | } | |
1485 | ||
bf269551 CL |
1486 | static int |
1487 | gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, | |
1488 | __be32 *p, void *obj) | |
1489 | { | |
1490 | struct xdr_stream xdr; | |
1491 | ||
1492 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
1493 | return decode(rqstp, &xdr, obj); | |
1494 | } | |
2d2da60c | 1495 | |
1da177e4 LT |
1496 | static int |
1497 | gss_unwrap_resp(struct rpc_task *task, | |
bf269551 | 1498 | kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1499 | { |
a17c2153 | 1500 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1501 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1502 | gc_base); | |
1503 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1504 | __be32 *savedp = p; |
2d2da60c BF |
1505 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1506 | int savedlen = head->iov_len; | |
1da177e4 LT |
1507 | int status = -EIO; |
1508 | ||
1509 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1510 | goto out_decode; | |
1511 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1512 | case RPC_GSS_SVC_NONE: |
1513 | break; | |
1514 | case RPC_GSS_SVC_INTEGRITY: | |
1515 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1516 | if (status) | |
1517 | goto out; | |
1518 | break; | |
1519 | case RPC_GSS_SVC_PRIVACY: | |
1520 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); | |
1521 | if (status) | |
1522 | goto out; | |
1523 | break; | |
1da177e4 | 1524 | } |
24b2605b | 1525 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 1526 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 1527 | + (savedlen - head->iov_len); |
1da177e4 | 1528 | out_decode: |
bf269551 | 1529 | status = gss_unwrap_req_decode(decode, rqstp, p, obj); |
1da177e4 LT |
1530 | out: |
1531 | gss_put_ctx(ctx); | |
8885cb36 | 1532 | dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, |
1da177e4 LT |
1533 | status); |
1534 | return status; | |
1535 | } | |
cca5172a | 1536 | |
f1c0a861 | 1537 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1538 | .owner = THIS_MODULE, |
1539 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 1540 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
1541 | .create = gss_create, |
1542 | .destroy = gss_destroy, | |
1543 | .lookup_cred = gss_lookup_cred, | |
1544 | .crcreate = gss_create_cred | |
1545 | }; | |
1546 | ||
f1c0a861 | 1547 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1548 | .cr_name = "AUTH_GSS", |
1549 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1550 | .cr_init = gss_cred_init, |
5c691044 | 1551 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
1552 | .crmatch = gss_match, |
1553 | .crmarshal = gss_marshal, | |
1554 | .crrefresh = gss_refresh, | |
1555 | .crvalidate = gss_validate, | |
1556 | .crwrap_req = gss_wrap_req, | |
1557 | .crunwrap_resp = gss_unwrap_resp, | |
1558 | }; | |
1559 | ||
0df7fb74 TM |
1560 | static const struct rpc_credops gss_nullops = { |
1561 | .cr_name = "AUTH_GSS", | |
6dcd3926 | 1562 | .crdestroy = gss_destroy_nullcred, |
5c691044 | 1563 | .crbind = rpcauth_generic_bind_cred, |
0df7fb74 TM |
1564 | .crmatch = gss_match, |
1565 | .crmarshal = gss_marshal, | |
1566 | .crrefresh = gss_refresh_null, | |
1567 | .crvalidate = gss_validate, | |
1568 | .crwrap_req = gss_wrap_req, | |
1569 | .crunwrap_resp = gss_unwrap_resp, | |
1570 | }; | |
1571 | ||
b693ba4a | 1572 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
c1225158 | 1573 | .upcall = rpc_pipe_generic_upcall, |
34769fc4 BF |
1574 | .downcall = gss_pipe_downcall, |
1575 | .destroy_msg = gss_pipe_destroy_msg, | |
1576 | .open_pipe = gss_pipe_open_v0, | |
1577 | .release_pipe = gss_pipe_release, | |
1578 | }; | |
1579 | ||
b693ba4a | 1580 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
c1225158 | 1581 | .upcall = rpc_pipe_generic_upcall, |
1da177e4 LT |
1582 | .downcall = gss_pipe_downcall, |
1583 | .destroy_msg = gss_pipe_destroy_msg, | |
34769fc4 | 1584 | .open_pipe = gss_pipe_open_v1, |
1da177e4 LT |
1585 | .release_pipe = gss_pipe_release, |
1586 | }; | |
1587 | ||
1588 | /* | |
1589 | * Initialize RPCSEC_GSS module | |
1590 | */ | |
1591 | static int __init init_rpcsec_gss(void) | |
1592 | { | |
1593 | int err = 0; | |
1594 | ||
1595 | err = rpcauth_register(&authgss_ops); | |
1596 | if (err) | |
1597 | goto out; | |
1598 | err = gss_svc_init(); | |
1599 | if (err) | |
1600 | goto out_unregister; | |
79a3f20b | 1601 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
1da177e4 LT |
1602 | return 0; |
1603 | out_unregister: | |
1604 | rpcauth_unregister(&authgss_ops); | |
1605 | out: | |
1606 | return err; | |
1607 | } | |
1608 | ||
1609 | static void __exit exit_rpcsec_gss(void) | |
1610 | { | |
1611 | gss_svc_shutdown(); | |
1612 | rpcauth_unregister(&authgss_ops); | |
bf12691d | 1613 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1614 | } |
1615 | ||
1616 | MODULE_LICENSE("GPL"); | |
126e216a TM |
1617 | module_param_named(expired_cred_retry_delay, |
1618 | gss_expired_cred_retry_delay, | |
1619 | uint, 0644); | |
1620 | MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " | |
1621 | "the RPC engine retries an expired credential"); | |
1622 | ||
1da177e4 LT |
1623 | module_init(init_rpcsec_gss) |
1624 | module_exit(exit_rpcsec_gss) |