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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> | |
eb6dc19d | 54 | #include <linux/hashtable.h> |
1da177e4 | 55 | |
abfdbd53 TM |
56 | #include "../netns.h" |
57 | ||
f1c0a861 | 58 | static const struct rpc_authops authgss_ops; |
1da177e4 | 59 | |
f1c0a861 | 60 | static const struct rpc_credops gss_credops; |
0df7fb74 | 61 | static const struct rpc_credops gss_nullops; |
1da177e4 | 62 | |
126e216a TM |
63 | #define GSS_RETRY_EXPIRED 5 |
64 | static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; | |
65 | ||
4de6caa2 AA |
66 | #define GSS_KEY_EXPIRE_TIMEO 240 |
67 | static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO; | |
68 | ||
1da177e4 LT |
69 | #ifdef RPC_DEBUG |
70 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
71 | #endif | |
72 | ||
725f2865 | 73 | #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) |
1da177e4 LT |
74 | /* length of a krb5 verifier (48), plus data added before arguments when |
75 | * using integrity (two 4-byte integers): */ | |
adeb8133 | 76 | #define GSS_VERF_SLACK 100 |
1da177e4 | 77 | |
23c323af | 78 | static DEFINE_HASHTABLE(gss_auth_hash_table, 4); |
eb6dc19d TM |
79 | static DEFINE_SPINLOCK(gss_auth_hash_lock); |
80 | ||
19172284 TM |
81 | struct gss_pipe { |
82 | struct rpc_pipe_dir_object pdo; | |
83 | struct rpc_pipe *pipe; | |
84 | struct rpc_clnt *clnt; | |
85 | const char *name; | |
414a6295 | 86 | struct kref kref; |
19172284 TM |
87 | }; |
88 | ||
1da177e4 | 89 | struct gss_auth { |
0285ed1f | 90 | struct kref kref; |
eb6dc19d | 91 | struct hlist_node hash; |
1da177e4 LT |
92 | struct rpc_auth rpc_auth; |
93 | struct gss_api_mech *mech; | |
94 | enum rpc_gss_svc service; | |
1da177e4 | 95 | struct rpc_clnt *client; |
e726340a | 96 | struct net *net; |
34769fc4 BF |
97 | /* |
98 | * There are two upcall pipes; dentry[1], named "gssd", is used | |
99 | * for the new text-based upcall; dentry[0] is named after the | |
100 | * mechanism (for example, "krb5") and exists for | |
101 | * backwards-compatibility with older gssd's. | |
102 | */ | |
19172284 | 103 | struct gss_pipe *gss_pipe[2]; |
bd4a3eb1 | 104 | const char *target_name; |
1da177e4 LT |
105 | }; |
106 | ||
79a3f20b | 107 | /* pipe_version >= 0 if and only if someone has a pipe open. */ |
79a3f20b BF |
108 | static DEFINE_SPINLOCK(pipe_version_lock); |
109 | static struct rpc_wait_queue pipe_version_rpc_waitqueue; | |
110 | static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); | |
cf81939d | 111 | |
5d28dc82 | 112 | static void gss_free_ctx(struct gss_cl_ctx *); |
b693ba4a TM |
113 | static const struct rpc_pipe_ops gss_upcall_ops_v0; |
114 | static const struct rpc_pipe_ops gss_upcall_ops_v1; | |
1da177e4 | 115 | |
1da177e4 LT |
116 | static inline struct gss_cl_ctx * |
117 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
118 | { | |
119 | atomic_inc(&ctx->count); | |
120 | return ctx; | |
121 | } | |
122 | ||
123 | static inline void | |
124 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
125 | { | |
126 | if (atomic_dec_and_test(&ctx->count)) | |
5d28dc82 | 127 | gss_free_ctx(ctx); |
1da177e4 LT |
128 | } |
129 | ||
5d28dc82 TM |
130 | /* gss_cred_set_ctx: |
131 | * called by gss_upcall_callback and gss_create_upcall in order | |
132 | * to set the gss context. The actual exchange of an old context | |
9beae467 | 133 | * and a new one is protected by the pipe->lock. |
5d28dc82 | 134 | */ |
1da177e4 LT |
135 | static void |
136 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
137 | { | |
138 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
5d28dc82 | 139 | |
cd019f75 TM |
140 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
141 | return; | |
7b6962b0 | 142 | gss_get_ctx(ctx); |
cf778b00 | 143 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 | 144 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
cd019f75 | 145 | smp_mb__before_clear_bit(); |
fc432dd9 | 146 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
1da177e4 LT |
147 | } |
148 | ||
149 | static const void * | |
150 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
151 | { | |
152 | const void *q = (const void *)((const char *)p + len); | |
153 | if (unlikely(q > end || q < p)) | |
154 | return ERR_PTR(-EFAULT); | |
155 | memcpy(res, p, len); | |
156 | return q; | |
157 | } | |
158 | ||
159 | static inline const void * | |
160 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
161 | { | |
162 | const void *q; | |
163 | unsigned int len; | |
164 | ||
165 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
166 | if (IS_ERR(p)) | |
167 | return p; | |
168 | q = (const void *)((const char *)p + len); | |
169 | if (unlikely(q > end || q < p)) | |
170 | return ERR_PTR(-EFAULT); | |
0f38b873 | 171 | dest->data = kmemdup(p, len, GFP_NOFS); |
1da177e4 LT |
172 | if (unlikely(dest->data == NULL)) |
173 | return ERR_PTR(-ENOMEM); | |
174 | dest->len = len; | |
1da177e4 LT |
175 | return q; |
176 | } | |
177 | ||
178 | static struct gss_cl_ctx * | |
179 | gss_cred_get_ctx(struct rpc_cred *cred) | |
180 | { | |
181 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
182 | struct gss_cl_ctx *ctx = NULL; | |
183 | ||
5d28dc82 | 184 | rcu_read_lock(); |
1da177e4 LT |
185 | if (gss_cred->gc_ctx) |
186 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
5d28dc82 | 187 | rcu_read_unlock(); |
1da177e4 LT |
188 | return ctx; |
189 | } | |
190 | ||
191 | static struct gss_cl_ctx * | |
192 | gss_alloc_context(void) | |
193 | { | |
194 | struct gss_cl_ctx *ctx; | |
195 | ||
0f38b873 | 196 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
1da177e4 | 197 | if (ctx != NULL) { |
1da177e4 LT |
198 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
199 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
200 | spin_lock_init(&ctx->gc_seq_lock); | |
201 | atomic_set(&ctx->count,1); | |
202 | } | |
203 | return ctx; | |
204 | } | |
205 | ||
206 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
207 | static const void * | |
208 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
209 | { | |
210 | const void *q; | |
211 | unsigned int seclen; | |
212 | unsigned int timeout; | |
620038f6 | 213 | unsigned long now = jiffies; |
1da177e4 LT |
214 | u32 window_size; |
215 | int ret; | |
216 | ||
620038f6 AA |
217 | /* First unsigned int gives the remaining lifetime in seconds of the |
218 | * credential - e.g. the remaining TGT lifetime for Kerberos or | |
219 | * the -t value passed to GSSD. | |
220 | */ | |
1da177e4 LT |
221 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); |
222 | if (IS_ERR(p)) | |
223 | goto err; | |
224 | if (timeout == 0) | |
225 | timeout = GSSD_MIN_TIMEOUT; | |
620038f6 AA |
226 | ctx->gc_expiry = now + ((unsigned long)timeout * HZ); |
227 | /* Sequence number window. Determines the maximum number of | |
228 | * simultaneous requests | |
229 | */ | |
1da177e4 LT |
230 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); |
231 | if (IS_ERR(p)) | |
232 | goto err; | |
233 | ctx->gc_win = window_size; | |
234 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
235 | if (ctx->gc_win == 0) { | |
dc5ddce9 JL |
236 | /* |
237 | * in which case, p points to an error code. Anything other | |
238 | * than -EKEYEXPIRED gets converted to -EACCES. | |
239 | */ | |
240 | p = simple_get_bytes(p, end, &ret, sizeof(ret)); | |
241 | if (!IS_ERR(p)) | |
242 | p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : | |
243 | ERR_PTR(-EACCES); | |
1da177e4 LT |
244 | goto err; |
245 | } | |
246 | /* copy the opaque wire context */ | |
247 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
248 | if (IS_ERR(p)) | |
249 | goto err; | |
250 | /* import the opaque security context */ | |
251 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
252 | if (IS_ERR(p)) | |
253 | goto err; | |
254 | q = (const void *)((const char *)p + seclen); | |
255 | if (unlikely(q > end || q < p)) { | |
256 | p = ERR_PTR(-EFAULT); | |
257 | goto err; | |
258 | } | |
400f26b5 | 259 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); |
1da177e4 LT |
260 | if (ret < 0) { |
261 | p = ERR_PTR(ret); | |
262 | goto err; | |
263 | } | |
620038f6 AA |
264 | dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u\n", |
265 | __func__, ctx->gc_expiry, now, timeout); | |
1da177e4 LT |
266 | return q; |
267 | err: | |
173db309 | 268 | dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); |
1da177e4 LT |
269 | return p; |
270 | } | |
271 | ||
34769fc4 | 272 | #define UPCALL_BUF_LEN 128 |
1da177e4 LT |
273 | |
274 | struct gss_upcall_msg { | |
275 | atomic_t count; | |
7eaf040b | 276 | kuid_t uid; |
1da177e4 LT |
277 | struct rpc_pipe_msg msg; |
278 | struct list_head list; | |
279 | struct gss_auth *auth; | |
9beae467 | 280 | struct rpc_pipe *pipe; |
1da177e4 LT |
281 | struct rpc_wait_queue rpc_waitqueue; |
282 | wait_queue_head_t waitqueue; | |
283 | struct gss_cl_ctx *ctx; | |
34769fc4 | 284 | char databuf[UPCALL_BUF_LEN]; |
1da177e4 LT |
285 | }; |
286 | ||
2aed8b47 | 287 | static int get_pipe_version(struct net *net) |
79a3f20b | 288 | { |
2aed8b47 | 289 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
79a3f20b BF |
290 | int ret; |
291 | ||
292 | spin_lock(&pipe_version_lock); | |
2aed8b47 TM |
293 | if (sn->pipe_version >= 0) { |
294 | atomic_inc(&sn->pipe_users); | |
295 | ret = sn->pipe_version; | |
79a3f20b BF |
296 | } else |
297 | ret = -EAGAIN; | |
298 | spin_unlock(&pipe_version_lock); | |
299 | return ret; | |
300 | } | |
301 | ||
2aed8b47 | 302 | static void put_pipe_version(struct net *net) |
79a3f20b | 303 | { |
2aed8b47 TM |
304 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
305 | ||
306 | if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { | |
307 | sn->pipe_version = -1; | |
79a3f20b BF |
308 | spin_unlock(&pipe_version_lock); |
309 | } | |
310 | } | |
311 | ||
1da177e4 LT |
312 | static void |
313 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
314 | { | |
e726340a | 315 | struct net *net = gss_msg->auth->net; |
1da177e4 LT |
316 | if (!atomic_dec_and_test(&gss_msg->count)) |
317 | return; | |
2aed8b47 | 318 | put_pipe_version(net); |
1da177e4 LT |
319 | BUG_ON(!list_empty(&gss_msg->list)); |
320 | if (gss_msg->ctx != NULL) | |
321 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 322 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
1da177e4 LT |
323 | kfree(gss_msg); |
324 | } | |
325 | ||
326 | static struct gss_upcall_msg * | |
7eaf040b | 327 | __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid) |
1da177e4 LT |
328 | { |
329 | struct gss_upcall_msg *pos; | |
9beae467 | 330 | list_for_each_entry(pos, &pipe->in_downcall, list) { |
0b4d51b0 | 331 | if (!uid_eq(pos->uid, uid)) |
1da177e4 LT |
332 | continue; |
333 | atomic_inc(&pos->count); | |
632f0d05 | 334 | dprintk("RPC: %s found msg %p\n", __func__, pos); |
1da177e4 LT |
335 | return pos; |
336 | } | |
632f0d05 | 337 | dprintk("RPC: %s found nothing\n", __func__); |
1da177e4 LT |
338 | return NULL; |
339 | } | |
340 | ||
720b8f2d | 341 | /* Try to add an upcall to the pipefs queue. |
1da177e4 LT |
342 | * If an upcall owned by our uid already exists, then we return a reference |
343 | * to that upcall instead of adding the new upcall. | |
344 | */ | |
345 | static inline struct gss_upcall_msg * | |
053e324f | 346 | gss_add_msg(struct gss_upcall_msg *gss_msg) |
1da177e4 | 347 | { |
9beae467 | 348 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 LT |
349 | struct gss_upcall_msg *old; |
350 | ||
9beae467 SK |
351 | spin_lock(&pipe->lock); |
352 | old = __gss_find_upcall(pipe, gss_msg->uid); | |
1da177e4 LT |
353 | if (old == NULL) { |
354 | atomic_inc(&gss_msg->count); | |
9beae467 | 355 | list_add(&gss_msg->list, &pipe->in_downcall); |
1da177e4 LT |
356 | } else |
357 | gss_msg = old; | |
9beae467 | 358 | spin_unlock(&pipe->lock); |
1da177e4 LT |
359 | return gss_msg; |
360 | } | |
361 | ||
362 | static void | |
363 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
364 | { | |
1da177e4 LT |
365 | list_del_init(&gss_msg->list); |
366 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
367 | wake_up_all(&gss_msg->waitqueue); | |
368 | atomic_dec(&gss_msg->count); | |
369 | } | |
370 | ||
371 | static void | |
372 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
373 | { | |
9beae467 | 374 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 375 | |
3b68aaea TM |
376 | if (list_empty(&gss_msg->list)) |
377 | return; | |
9beae467 | 378 | spin_lock(&pipe->lock); |
3b68aaea TM |
379 | if (!list_empty(&gss_msg->list)) |
380 | __gss_unhash_msg(gss_msg); | |
9beae467 | 381 | spin_unlock(&pipe->lock); |
1da177e4 LT |
382 | } |
383 | ||
126e216a TM |
384 | static void |
385 | gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) | |
386 | { | |
387 | switch (gss_msg->msg.errno) { | |
388 | case 0: | |
389 | if (gss_msg->ctx == NULL) | |
390 | break; | |
391 | clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
392 | gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); | |
393 | break; | |
394 | case -EKEYEXPIRED: | |
395 | set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
396 | } | |
397 | gss_cred->gc_upcall_timestamp = jiffies; | |
398 | gss_cred->gc_upcall = NULL; | |
399 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
400 | } | |
401 | ||
1da177e4 LT |
402 | static void |
403 | gss_upcall_callback(struct rpc_task *task) | |
404 | { | |
a17c2153 | 405 | struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, |
1da177e4 LT |
406 | struct gss_cred, gc_base); |
407 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
9beae467 | 408 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 409 | |
9beae467 | 410 | spin_lock(&pipe->lock); |
126e216a | 411 | gss_handle_downcall_result(gss_cred, gss_msg); |
9beae467 | 412 | spin_unlock(&pipe->lock); |
126e216a | 413 | task->tk_status = gss_msg->msg.errno; |
1da177e4 LT |
414 | gss_release_msg(gss_msg); |
415 | } | |
416 | ||
34769fc4 BF |
417 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) |
418 | { | |
90602c7b EB |
419 | uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); |
420 | memcpy(gss_msg->databuf, &uid, sizeof(uid)); | |
421 | gss_msg->msg.data = gss_msg->databuf; | |
422 | gss_msg->msg.len = sizeof(uid); | |
9d3a2260 TM |
423 | |
424 | BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf)); | |
34769fc4 BF |
425 | } |
426 | ||
9d3a2260 | 427 | static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
bd4a3eb1 TM |
428 | const char *service_name, |
429 | const char *target_name) | |
34769fc4 | 430 | { |
683ac665 | 431 | struct gss_api_mech *mech = gss_msg->auth->mech; |
8b1c7bf5 | 432 | char *p = gss_msg->databuf; |
9d3a2260 TM |
433 | size_t buflen = sizeof(gss_msg->databuf); |
434 | int len; | |
435 | ||
436 | len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name, | |
437 | from_kuid(&init_user_ns, gss_msg->uid)); | |
438 | buflen -= len; | |
439 | p += len; | |
440 | gss_msg->msg.len = len; | |
bd4a3eb1 | 441 | if (target_name) { |
9d3a2260 TM |
442 | len = scnprintf(p, buflen, "target=%s ", target_name); |
443 | buflen -= len; | |
8b1c7bf5 OK |
444 | p += len; |
445 | gss_msg->msg.len += len; | |
446 | } | |
68c97153 | 447 | if (service_name != NULL) { |
9d3a2260 TM |
448 | len = scnprintf(p, buflen, "service=%s ", service_name); |
449 | buflen -= len; | |
2efef708 OK |
450 | p += len; |
451 | gss_msg->msg.len += len; | |
452 | } | |
683ac665 | 453 | if (mech->gm_upcall_enctypes) { |
9d3a2260 TM |
454 | len = scnprintf(p, buflen, "enctypes=%s ", |
455 | mech->gm_upcall_enctypes); | |
456 | buflen -= len; | |
683ac665 TM |
457 | p += len; |
458 | gss_msg->msg.len += len; | |
459 | } | |
9d3a2260 TM |
460 | len = scnprintf(p, buflen, "\n"); |
461 | if (len == 0) | |
462 | goto out_overflow; | |
8b1c7bf5 OK |
463 | gss_msg->msg.len += len; |
464 | ||
34769fc4 | 465 | gss_msg->msg.data = gss_msg->databuf; |
9d3a2260 TM |
466 | return 0; |
467 | out_overflow: | |
468 | WARN_ON_ONCE(1); | |
469 | return -ENOMEM; | |
34769fc4 BF |
470 | } |
471 | ||
68c97153 | 472 | static struct gss_upcall_msg * |
e726340a | 473 | gss_alloc_msg(struct gss_auth *gss_auth, |
7eaf040b | 474 | kuid_t uid, const char *service_name) |
1da177e4 LT |
475 | { |
476 | struct gss_upcall_msg *gss_msg; | |
79a3f20b | 477 | int vers; |
9d3a2260 | 478 | int err = -ENOMEM; |
1da177e4 | 479 | |
0f38b873 | 480 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
db75b3d6 | 481 | if (gss_msg == NULL) |
9d3a2260 | 482 | goto err; |
e726340a | 483 | vers = get_pipe_version(gss_auth->net); |
9d3a2260 TM |
484 | err = vers; |
485 | if (err < 0) | |
486 | goto err_free_msg; | |
19172284 | 487 | gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe; |
db75b3d6 BF |
488 | INIT_LIST_HEAD(&gss_msg->list); |
489 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
490 | init_waitqueue_head(&gss_msg->waitqueue); | |
491 | atomic_set(&gss_msg->count, 1); | |
db75b3d6 BF |
492 | gss_msg->uid = uid; |
493 | gss_msg->auth = gss_auth; | |
bd4a3eb1 TM |
494 | switch (vers) { |
495 | case 0: | |
496 | gss_encode_v0_msg(gss_msg); | |
5fccc5b5 | 497 | break; |
bd4a3eb1 | 498 | default: |
9d3a2260 TM |
499 | err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name); |
500 | if (err) | |
501 | goto err_free_msg; | |
bd4a3eb1 | 502 | }; |
1da177e4 | 503 | return gss_msg; |
9d3a2260 TM |
504 | err_free_msg: |
505 | kfree(gss_msg); | |
506 | err: | |
507 | return ERR_PTR(err); | |
1da177e4 LT |
508 | } |
509 | ||
510 | static struct gss_upcall_msg * | |
e726340a | 511 | gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred) |
1da177e4 | 512 | { |
7c67db3a TM |
513 | struct gss_cred *gss_cred = container_of(cred, |
514 | struct gss_cred, gc_base); | |
1da177e4 | 515 | struct gss_upcall_msg *gss_new, *gss_msg; |
7eaf040b | 516 | kuid_t uid = cred->cr_uid; |
1da177e4 | 517 | |
e726340a | 518 | gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal); |
db75b3d6 BF |
519 | if (IS_ERR(gss_new)) |
520 | return gss_new; | |
053e324f | 521 | gss_msg = gss_add_msg(gss_new); |
1da177e4 | 522 | if (gss_msg == gss_new) { |
9beae467 | 523 | int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); |
1da177e4 LT |
524 | if (res) { |
525 | gss_unhash_msg(gss_new); | |
526 | gss_msg = ERR_PTR(res); | |
527 | } | |
528 | } else | |
529 | gss_release_msg(gss_new); | |
530 | return gss_msg; | |
531 | } | |
532 | ||
b03568c3 BF |
533 | static void warn_gssd(void) |
534 | { | |
535 | static unsigned long ratelimit; | |
536 | unsigned long now = jiffies; | |
537 | ||
538 | if (time_after(now, ratelimit)) { | |
89f84243 | 539 | pr_warn("RPC: AUTH_GSS upcall failed. Please check user daemon is running.\n"); |
b03568c3 BF |
540 | ratelimit = now + 15*HZ; |
541 | } | |
542 | } | |
543 | ||
1da177e4 LT |
544 | static inline int |
545 | gss_refresh_upcall(struct rpc_task *task) | |
546 | { | |
a17c2153 | 547 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
4a8c1344 | 548 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
549 | struct gss_auth, rpc_auth); |
550 | struct gss_cred *gss_cred = container_of(cred, | |
551 | struct gss_cred, gc_base); | |
552 | struct gss_upcall_msg *gss_msg; | |
9beae467 | 553 | struct rpc_pipe *pipe; |
1da177e4 LT |
554 | int err = 0; |
555 | ||
632f0d05 | 556 | dprintk("RPC: %5u %s for uid %u\n", |
cdba321e | 557 | task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid)); |
e726340a | 558 | gss_msg = gss_setup_upcall(gss_auth, cred); |
480e3243 | 559 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
79a3f20b BF |
560 | /* XXX: warning on the first, under the assumption we |
561 | * shouldn't normally hit this case on a refresh. */ | |
562 | warn_gssd(); | |
563 | task->tk_timeout = 15*HZ; | |
564 | rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); | |
d1a8016a | 565 | return -EAGAIN; |
79a3f20b | 566 | } |
1da177e4 LT |
567 | if (IS_ERR(gss_msg)) { |
568 | err = PTR_ERR(gss_msg); | |
569 | goto out; | |
570 | } | |
9beae467 SK |
571 | pipe = gss_msg->pipe; |
572 | spin_lock(&pipe->lock); | |
1da177e4 | 573 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 574 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
126e216a | 575 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
1da177e4 LT |
576 | task->tk_timeout = 0; |
577 | gss_cred->gc_upcall = gss_msg; | |
578 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
579 | atomic_inc(&gss_msg->count); | |
5d00837b | 580 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
126e216a TM |
581 | } else { |
582 | gss_handle_downcall_result(gss_cred, gss_msg); | |
1da177e4 | 583 | err = gss_msg->msg.errno; |
126e216a | 584 | } |
9beae467 | 585 | spin_unlock(&pipe->lock); |
1da177e4 LT |
586 | gss_release_msg(gss_msg); |
587 | out: | |
632f0d05 | 588 | dprintk("RPC: %5u %s for uid %u result %d\n", |
cdba321e EB |
589 | task->tk_pid, __func__, |
590 | from_kuid(&init_user_ns, cred->cr_uid), err); | |
1da177e4 LT |
591 | return err; |
592 | } | |
593 | ||
594 | static inline int | |
595 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
596 | { | |
e726340a | 597 | struct net *net = gss_auth->net; |
abfdbd53 | 598 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
9beae467 | 599 | struct rpc_pipe *pipe; |
1da177e4 LT |
600 | struct rpc_cred *cred = &gss_cred->gc_base; |
601 | struct gss_upcall_msg *gss_msg; | |
602 | DEFINE_WAIT(wait); | |
d36ccb9c | 603 | int err; |
1da177e4 | 604 | |
cdba321e EB |
605 | dprintk("RPC: %s for uid %u\n", |
606 | __func__, from_kuid(&init_user_ns, cred->cr_uid)); | |
79a3f20b | 607 | retry: |
d36ccb9c | 608 | err = 0; |
89f84243 JL |
609 | /* if gssd is down, just skip upcalling altogether */ |
610 | if (!gssd_running(net)) { | |
611 | warn_gssd(); | |
612 | return -EACCES; | |
613 | } | |
e726340a | 614 | gss_msg = gss_setup_upcall(gss_auth, cred); |
79a3f20b BF |
615 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
616 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, | |
89f84243 | 617 | sn->pipe_version >= 0, 15 * HZ); |
2aed8b47 | 618 | if (sn->pipe_version < 0) { |
d1a8016a BS |
619 | warn_gssd(); |
620 | err = -EACCES; | |
621 | } | |
d36ccb9c | 622 | if (err < 0) |
79a3f20b | 623 | goto out; |
79a3f20b BF |
624 | goto retry; |
625 | } | |
1da177e4 LT |
626 | if (IS_ERR(gss_msg)) { |
627 | err = PTR_ERR(gss_msg); | |
628 | goto out; | |
629 | } | |
9beae467 | 630 | pipe = gss_msg->pipe; |
1da177e4 | 631 | for (;;) { |
5afa9133 | 632 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); |
9beae467 | 633 | spin_lock(&pipe->lock); |
1da177e4 | 634 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
635 | break; |
636 | } | |
9beae467 | 637 | spin_unlock(&pipe->lock); |
5afa9133 | 638 | if (fatal_signal_pending(current)) { |
1da177e4 LT |
639 | err = -ERESTARTSYS; |
640 | goto out_intr; | |
641 | } | |
642 | schedule(); | |
643 | } | |
644 | if (gss_msg->ctx) | |
7b6962b0 | 645 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
646 | else |
647 | err = gss_msg->msg.errno; | |
9beae467 | 648 | spin_unlock(&pipe->lock); |
1da177e4 LT |
649 | out_intr: |
650 | finish_wait(&gss_msg->waitqueue, &wait); | |
651 | gss_release_msg(gss_msg); | |
652 | out: | |
632f0d05 | 653 | dprintk("RPC: %s for uid %u result %d\n", |
cdba321e | 654 | __func__, from_kuid(&init_user_ns, cred->cr_uid), err); |
1da177e4 LT |
655 | return err; |
656 | } | |
657 | ||
1da177e4 LT |
658 | #define MSG_BUF_MAXSIZE 1024 |
659 | ||
660 | static ssize_t | |
661 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
662 | { | |
663 | const void *p, *end; | |
664 | void *buf; | |
1da177e4 | 665 | struct gss_upcall_msg *gss_msg; |
496ad9aa | 666 | struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; |
1da177e4 | 667 | struct gss_cl_ctx *ctx; |
90602c7b EB |
668 | uid_t id; |
669 | kuid_t uid; | |
3b68aaea | 670 | ssize_t err = -EFBIG; |
1da177e4 LT |
671 | |
672 | if (mlen > MSG_BUF_MAXSIZE) | |
673 | goto out; | |
674 | err = -ENOMEM; | |
0f38b873 | 675 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
676 | if (!buf) |
677 | goto out; | |
678 | ||
1da177e4 LT |
679 | err = -EFAULT; |
680 | if (copy_from_user(buf, src, mlen)) | |
681 | goto err; | |
682 | ||
683 | end = (const void *)((char *)buf + mlen); | |
90602c7b | 684 | p = simple_get_bytes(buf, end, &id, sizeof(id)); |
1da177e4 LT |
685 | if (IS_ERR(p)) { |
686 | err = PTR_ERR(p); | |
687 | goto err; | |
688 | } | |
689 | ||
90602c7b EB |
690 | uid = make_kuid(&init_user_ns, id); |
691 | if (!uid_valid(uid)) { | |
692 | err = -EINVAL; | |
693 | goto err; | |
694 | } | |
695 | ||
1da177e4 LT |
696 | err = -ENOMEM; |
697 | ctx = gss_alloc_context(); | |
698 | if (ctx == NULL) | |
699 | goto err; | |
3b68aaea TM |
700 | |
701 | err = -ENOENT; | |
702 | /* Find a matching upcall */ | |
9beae467 SK |
703 | spin_lock(&pipe->lock); |
704 | gss_msg = __gss_find_upcall(pipe, uid); | |
3b68aaea | 705 | if (gss_msg == NULL) { |
9beae467 | 706 | spin_unlock(&pipe->lock); |
3b68aaea TM |
707 | goto err_put_ctx; |
708 | } | |
709 | list_del_init(&gss_msg->list); | |
9beae467 | 710 | spin_unlock(&pipe->lock); |
3b68aaea | 711 | |
6e84c7b6 | 712 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
713 | if (IS_ERR(p)) { |
714 | err = PTR_ERR(p); | |
486bad2e JL |
715 | switch (err) { |
716 | case -EACCES: | |
dc5ddce9 | 717 | case -EKEYEXPIRED: |
486bad2e JL |
718 | gss_msg->msg.errno = err; |
719 | err = mlen; | |
720 | break; | |
721 | case -EFAULT: | |
722 | case -ENOMEM: | |
723 | case -EINVAL: | |
724 | case -ENOSYS: | |
725 | gss_msg->msg.errno = -EAGAIN; | |
726 | break; | |
727 | default: | |
728 | printk(KERN_CRIT "%s: bad return from " | |
6c853099 | 729 | "gss_fill_context: %zd\n", __func__, err); |
486bad2e JL |
730 | BUG(); |
731 | } | |
3b68aaea | 732 | goto err_release_msg; |
1da177e4 | 733 | } |
3b68aaea TM |
734 | gss_msg->ctx = gss_get_ctx(ctx); |
735 | err = mlen; | |
736 | ||
737 | err_release_msg: | |
9beae467 | 738 | spin_lock(&pipe->lock); |
3b68aaea | 739 | __gss_unhash_msg(gss_msg); |
9beae467 | 740 | spin_unlock(&pipe->lock); |
3b68aaea | 741 | gss_release_msg(gss_msg); |
1da177e4 LT |
742 | err_put_ctx: |
743 | gss_put_ctx(ctx); | |
744 | err: | |
745 | kfree(buf); | |
746 | out: | |
632f0d05 | 747 | dprintk("RPC: %s returning %Zd\n", __func__, err); |
1da177e4 LT |
748 | return err; |
749 | } | |
750 | ||
34769fc4 | 751 | static int gss_pipe_open(struct inode *inode, int new_version) |
cf81939d | 752 | { |
2aed8b47 TM |
753 | struct net *net = inode->i_sb->s_fs_info; |
754 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
34769fc4 BF |
755 | int ret = 0; |
756 | ||
79a3f20b | 757 | spin_lock(&pipe_version_lock); |
2aed8b47 | 758 | if (sn->pipe_version < 0) { |
34769fc4 | 759 | /* First open of any gss pipe determines the version: */ |
2aed8b47 | 760 | sn->pipe_version = new_version; |
79a3f20b BF |
761 | rpc_wake_up(&pipe_version_rpc_waitqueue); |
762 | wake_up(&pipe_version_waitqueue); | |
2aed8b47 | 763 | } else if (sn->pipe_version != new_version) { |
34769fc4 BF |
764 | /* Trying to open a pipe of a different version */ |
765 | ret = -EBUSY; | |
766 | goto out; | |
79a3f20b | 767 | } |
2aed8b47 | 768 | atomic_inc(&sn->pipe_users); |
34769fc4 | 769 | out: |
79a3f20b | 770 | spin_unlock(&pipe_version_lock); |
34769fc4 BF |
771 | return ret; |
772 | ||
773 | } | |
774 | ||
775 | static int gss_pipe_open_v0(struct inode *inode) | |
776 | { | |
777 | return gss_pipe_open(inode, 0); | |
778 | } | |
779 | ||
780 | static int gss_pipe_open_v1(struct inode *inode) | |
781 | { | |
782 | return gss_pipe_open(inode, 1); | |
cf81939d BF |
783 | } |
784 | ||
1da177e4 LT |
785 | static void |
786 | gss_pipe_release(struct inode *inode) | |
787 | { | |
2aed8b47 | 788 | struct net *net = inode->i_sb->s_fs_info; |
9beae467 | 789 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
6e84c7b6 | 790 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 791 | |
5a67657a | 792 | restart: |
9beae467 SK |
793 | spin_lock(&pipe->lock); |
794 | list_for_each_entry(gss_msg, &pipe->in_downcall, list) { | |
1da177e4 | 795 | |
5a67657a TM |
796 | if (!list_empty(&gss_msg->msg.list)) |
797 | continue; | |
1da177e4 LT |
798 | gss_msg->msg.errno = -EPIPE; |
799 | atomic_inc(&gss_msg->count); | |
800 | __gss_unhash_msg(gss_msg); | |
9beae467 | 801 | spin_unlock(&pipe->lock); |
1da177e4 | 802 | gss_release_msg(gss_msg); |
5a67657a | 803 | goto restart; |
1da177e4 | 804 | } |
9beae467 | 805 | spin_unlock(&pipe->lock); |
cf81939d | 806 | |
2aed8b47 | 807 | put_pipe_version(net); |
1da177e4 LT |
808 | } |
809 | ||
810 | static void | |
811 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
812 | { | |
813 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
1da177e4 LT |
814 | |
815 | if (msg->errno < 0) { | |
632f0d05 CL |
816 | dprintk("RPC: %s releasing msg %p\n", |
817 | __func__, gss_msg); | |
1da177e4 LT |
818 | atomic_inc(&gss_msg->count); |
819 | gss_unhash_msg(gss_msg); | |
b03568c3 BF |
820 | if (msg->errno == -ETIMEDOUT) |
821 | warn_gssd(); | |
1da177e4 LT |
822 | gss_release_msg(gss_msg); |
823 | } | |
824 | } | |
825 | ||
19172284 TM |
826 | static void gss_pipe_dentry_destroy(struct dentry *dir, |
827 | struct rpc_pipe_dir_object *pdo) | |
ccdc28f8 | 828 | { |
19172284 TM |
829 | struct gss_pipe *gss_pipe = pdo->pdo_data; |
830 | struct rpc_pipe *pipe = gss_pipe->pipe; | |
ccdc28f8 | 831 | |
19172284 TM |
832 | if (pipe->dentry != NULL) { |
833 | rpc_unlink(pipe->dentry); | |
834 | pipe->dentry = NULL; | |
6b2fddd3 | 835 | } |
ccdc28f8 SK |
836 | } |
837 | ||
19172284 TM |
838 | static int gss_pipe_dentry_create(struct dentry *dir, |
839 | struct rpc_pipe_dir_object *pdo) | |
ccdc28f8 | 840 | { |
19172284 | 841 | struct gss_pipe *p = pdo->pdo_data; |
6b2fddd3 | 842 | struct dentry *dentry; |
ccdc28f8 | 843 | |
19172284 TM |
844 | dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe); |
845 | if (IS_ERR(dentry)) | |
846 | return PTR_ERR(dentry); | |
847 | p->pipe->dentry = dentry; | |
848 | return 0; | |
849 | } | |
850 | ||
851 | static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = { | |
852 | .create = gss_pipe_dentry_create, | |
853 | .destroy = gss_pipe_dentry_destroy, | |
854 | }; | |
855 | ||
856 | static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt, | |
857 | const char *name, | |
858 | const struct rpc_pipe_ops *upcall_ops) | |
859 | { | |
19172284 TM |
860 | struct gss_pipe *p; |
861 | int err = -ENOMEM; | |
ccdc28f8 | 862 | |
19172284 TM |
863 | p = kmalloc(sizeof(*p), GFP_KERNEL); |
864 | if (p == NULL) | |
6b2fddd3 | 865 | goto err; |
19172284 TM |
866 | p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); |
867 | if (IS_ERR(p->pipe)) { | |
868 | err = PTR_ERR(p->pipe); | |
869 | goto err_free_gss_pipe; | |
6b2fddd3 | 870 | } |
19172284 TM |
871 | p->name = name; |
872 | p->clnt = clnt; | |
414a6295 | 873 | kref_init(&p->kref); |
19172284 TM |
874 | rpc_init_pipe_dir_object(&p->pdo, |
875 | &gss_pipe_dir_object_ops, | |
876 | p); | |
414a6295 | 877 | return p; |
19172284 TM |
878 | err_free_gss_pipe: |
879 | kfree(p); | |
6b2fddd3 | 880 | err: |
19172284 | 881 | return ERR_PTR(err); |
ccdc28f8 SK |
882 | } |
883 | ||
414a6295 TM |
884 | struct gss_alloc_pdo { |
885 | struct rpc_clnt *clnt; | |
886 | const char *name; | |
887 | const struct rpc_pipe_ops *upcall_ops; | |
888 | }; | |
889 | ||
890 | static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data) | |
891 | { | |
892 | struct gss_pipe *gss_pipe; | |
893 | struct gss_alloc_pdo *args = data; | |
894 | ||
895 | if (pdo->pdo_ops != &gss_pipe_dir_object_ops) | |
896 | return 0; | |
897 | gss_pipe = container_of(pdo, struct gss_pipe, pdo); | |
898 | if (strcmp(gss_pipe->name, args->name) != 0) | |
899 | return 0; | |
900 | if (!kref_get_unless_zero(&gss_pipe->kref)) | |
901 | return 0; | |
902 | return 1; | |
903 | } | |
904 | ||
905 | static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data) | |
906 | { | |
907 | struct gss_pipe *gss_pipe; | |
908 | struct gss_alloc_pdo *args = data; | |
909 | ||
910 | gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops); | |
911 | if (!IS_ERR(gss_pipe)) | |
912 | return &gss_pipe->pdo; | |
913 | return NULL; | |
914 | } | |
915 | ||
916 | static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt, | |
917 | const char *name, | |
918 | const struct rpc_pipe_ops *upcall_ops) | |
919 | { | |
920 | struct net *net = rpc_net_ns(clnt); | |
921 | struct rpc_pipe_dir_object *pdo; | |
922 | struct gss_alloc_pdo args = { | |
923 | .clnt = clnt, | |
924 | .name = name, | |
925 | .upcall_ops = upcall_ops, | |
926 | }; | |
927 | ||
928 | pdo = rpc_find_or_alloc_pipe_dir_object(net, | |
929 | &clnt->cl_pipedir_objects, | |
930 | gss_pipe_match_pdo, | |
931 | gss_pipe_alloc_pdo, | |
932 | &args); | |
933 | if (pdo != NULL) | |
934 | return container_of(pdo, struct gss_pipe, pdo); | |
935 | return ERR_PTR(-ENOMEM); | |
936 | } | |
937 | ||
19172284 | 938 | static void __gss_pipe_free(struct gss_pipe *p) |
ccdc28f8 | 939 | { |
19172284 TM |
940 | struct rpc_clnt *clnt = p->clnt; |
941 | struct net *net = rpc_net_ns(clnt); | |
ccdc28f8 | 942 | |
19172284 TM |
943 | rpc_remove_pipe_dir_object(net, |
944 | &clnt->cl_pipedir_objects, | |
945 | &p->pdo); | |
946 | rpc_destroy_pipe_data(p->pipe); | |
947 | kfree(p); | |
ccdc28f8 SK |
948 | } |
949 | ||
414a6295 TM |
950 | static void __gss_pipe_release(struct kref *kref) |
951 | { | |
952 | struct gss_pipe *p = container_of(kref, struct gss_pipe, kref); | |
953 | ||
954 | __gss_pipe_free(p); | |
955 | } | |
956 | ||
19172284 | 957 | static void gss_pipe_free(struct gss_pipe *p) |
ccdc28f8 | 958 | { |
19172284 | 959 | if (p != NULL) |
414a6295 | 960 | kref_put(&p->kref, __gss_pipe_release); |
ccdc28f8 SK |
961 | } |
962 | ||
cca5172a YH |
963 | /* |
964 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
965 | * parameters based on the input flavor (which must be a pseudoflavor) |
966 | */ | |
eb6dc19d TM |
967 | static struct gss_auth * |
968 | gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) | |
1da177e4 | 969 | { |
c2190661 | 970 | rpc_authflavor_t flavor = args->pseudoflavor; |
1da177e4 | 971 | struct gss_auth *gss_auth; |
19172284 | 972 | struct gss_pipe *gss_pipe; |
1da177e4 | 973 | struct rpc_auth * auth; |
6a19275a | 974 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 975 | |
8885cb36 | 976 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
977 | |
978 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 979 | return ERR_PTR(err); |
1da177e4 LT |
980 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
981 | goto out_dec; | |
eb6dc19d | 982 | INIT_HLIST_NODE(&gss_auth->hash); |
bd4a3eb1 | 983 | gss_auth->target_name = NULL; |
c2190661 TM |
984 | if (args->target_name) { |
985 | gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL); | |
bd4a3eb1 TM |
986 | if (gss_auth->target_name == NULL) |
987 | goto err_free; | |
988 | } | |
1da177e4 | 989 | gss_auth->client = clnt; |
e726340a | 990 | gss_auth->net = get_net(rpc_net_ns(clnt)); |
6a19275a | 991 | err = -EINVAL; |
1da177e4 LT |
992 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
993 | if (!gss_auth->mech) { | |
9b1d75b7 | 994 | dprintk("RPC: Pseudoflavor %d not found!\n", flavor); |
e726340a | 995 | goto err_put_net; |
1da177e4 LT |
996 | } |
997 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
998 | if (gss_auth->service == 0) |
999 | goto err_put_mech; | |
1da177e4 LT |
1000 | auth = &gss_auth->rpc_auth; |
1001 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
1002 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
1003 | auth->au_ops = &authgss_ops; | |
1004 | auth->au_flavor = flavor; | |
1005 | atomic_set(&auth->au_count, 1); | |
0285ed1f | 1006 | kref_init(&gss_auth->kref); |
1da177e4 | 1007 | |
19172284 TM |
1008 | err = rpcauth_init_credcache(auth); |
1009 | if (err) | |
1010 | goto err_put_mech; | |
34769fc4 BF |
1011 | /* |
1012 | * Note: if we created the old pipe first, then someone who | |
1013 | * examined the directory at the right moment might conclude | |
1014 | * that we supported only the old pipe. So we instead create | |
1015 | * the new pipe first. | |
1016 | */ | |
414a6295 | 1017 | gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1); |
19172284 TM |
1018 | if (IS_ERR(gss_pipe)) { |
1019 | err = PTR_ERR(gss_pipe); | |
1020 | goto err_destroy_credcache; | |
6a19275a | 1021 | } |
19172284 | 1022 | gss_auth->gss_pipe[1] = gss_pipe; |
1da177e4 | 1023 | |
414a6295 | 1024 | gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name, |
19172284 TM |
1025 | &gss_upcall_ops_v0); |
1026 | if (IS_ERR(gss_pipe)) { | |
1027 | err = PTR_ERR(gss_pipe); | |
c239d83b SK |
1028 | goto err_destroy_pipe_1; |
1029 | } | |
19172284 | 1030 | gss_auth->gss_pipe[0] = gss_pipe; |
07a2bf1d | 1031 | |
eb6dc19d | 1032 | return gss_auth; |
c239d83b | 1033 | err_destroy_pipe_1: |
414a6295 | 1034 | gss_pipe_free(gss_auth->gss_pipe[1]); |
19172284 TM |
1035 | err_destroy_credcache: |
1036 | rpcauth_destroy_credcache(auth); | |
1da177e4 LT |
1037 | err_put_mech: |
1038 | gss_mech_put(gss_auth->mech); | |
e726340a TM |
1039 | err_put_net: |
1040 | put_net(gss_auth->net); | |
1da177e4 | 1041 | err_free: |
bd4a3eb1 | 1042 | kfree(gss_auth->target_name); |
1da177e4 LT |
1043 | kfree(gss_auth); |
1044 | out_dec: | |
1045 | module_put(THIS_MODULE); | |
6a19275a | 1046 | return ERR_PTR(err); |
1da177e4 LT |
1047 | } |
1048 | ||
0285ed1f TM |
1049 | static void |
1050 | gss_free(struct gss_auth *gss_auth) | |
1051 | { | |
19172284 TM |
1052 | gss_pipe_free(gss_auth->gss_pipe[0]); |
1053 | gss_pipe_free(gss_auth->gss_pipe[1]); | |
0285ed1f | 1054 | gss_mech_put(gss_auth->mech); |
e726340a | 1055 | put_net(gss_auth->net); |
bd4a3eb1 | 1056 | kfree(gss_auth->target_name); |
0285ed1f TM |
1057 | |
1058 | kfree(gss_auth); | |
1059 | module_put(THIS_MODULE); | |
1060 | } | |
1061 | ||
1062 | static void | |
1063 | gss_free_callback(struct kref *kref) | |
1064 | { | |
1065 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
1066 | ||
1067 | gss_free(gss_auth); | |
1068 | } | |
1069 | ||
1da177e4 LT |
1070 | static void |
1071 | gss_destroy(struct rpc_auth *auth) | |
1072 | { | |
19172284 TM |
1073 | struct gss_auth *gss_auth = container_of(auth, |
1074 | struct gss_auth, rpc_auth); | |
1da177e4 | 1075 | |
8885cb36 CL |
1076 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
1077 | auth, auth->au_flavor); | |
1da177e4 | 1078 | |
eb6dc19d TM |
1079 | if (hash_hashed(&gss_auth->hash)) { |
1080 | spin_lock(&gss_auth_hash_lock); | |
1081 | hash_del(&gss_auth->hash); | |
1082 | spin_unlock(&gss_auth_hash_lock); | |
1083 | } | |
1084 | ||
19172284 TM |
1085 | gss_pipe_free(gss_auth->gss_pipe[0]); |
1086 | gss_auth->gss_pipe[0] = NULL; | |
1087 | gss_pipe_free(gss_auth->gss_pipe[1]); | |
1088 | gss_auth->gss_pipe[1] = NULL; | |
3ab9bb72 TM |
1089 | rpcauth_destroy_credcache(auth); |
1090 | ||
0285ed1f | 1091 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
1092 | } |
1093 | ||
a0f6ed8e BF |
1094 | /* |
1095 | * Auths may be shared between rpc clients that were cloned from a | |
1096 | * common client with the same xprt, if they also share the flavor and | |
1097 | * target_name. | |
1098 | * | |
1099 | * The auth is looked up from the oldest parent sharing the same | |
1100 | * cl_xprt, and the auth itself references only that common parent | |
1101 | * (which is guaranteed to last as long as any of its descendants). | |
1102 | */ | |
eb6dc19d TM |
1103 | static struct gss_auth * |
1104 | gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args, | |
1105 | struct rpc_clnt *clnt, | |
1106 | struct gss_auth *new) | |
1107 | { | |
1108 | struct gss_auth *gss_auth; | |
1109 | unsigned long hashval = (unsigned long)clnt; | |
1110 | ||
1111 | spin_lock(&gss_auth_hash_lock); | |
1112 | hash_for_each_possible(gss_auth_hash_table, | |
1113 | gss_auth, | |
1114 | hash, | |
1115 | hashval) { | |
a0f6ed8e BF |
1116 | if (gss_auth->client != clnt) |
1117 | continue; | |
eb6dc19d TM |
1118 | if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor) |
1119 | continue; | |
1120 | if (gss_auth->target_name != args->target_name) { | |
1121 | if (gss_auth->target_name == NULL) | |
1122 | continue; | |
1123 | if (args->target_name == NULL) | |
1124 | continue; | |
1125 | if (strcmp(gss_auth->target_name, args->target_name)) | |
1126 | continue; | |
1127 | } | |
1128 | if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count)) | |
1129 | continue; | |
1130 | goto out; | |
1131 | } | |
1132 | if (new) | |
1133 | hash_add(gss_auth_hash_table, &new->hash, hashval); | |
1134 | gss_auth = new; | |
1135 | out: | |
1136 | spin_unlock(&gss_auth_hash_lock); | |
1137 | return gss_auth; | |
1138 | } | |
1139 | ||
1140 | static struct gss_auth * | |
1141 | gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) | |
1142 | { | |
1143 | struct gss_auth *gss_auth; | |
1144 | struct gss_auth *new; | |
1145 | ||
1146 | gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL); | |
1147 | if (gss_auth != NULL) | |
1148 | goto out; | |
1149 | new = gss_create_new(args, clnt); | |
1150 | if (IS_ERR(new)) | |
1151 | return new; | |
1152 | gss_auth = gss_auth_find_or_add_hashed(args, clnt, new); | |
1153 | if (gss_auth != new) | |
1154 | gss_destroy(&new->rpc_auth); | |
1155 | out: | |
1156 | return gss_auth; | |
1157 | } | |
1158 | ||
1159 | static struct rpc_auth * | |
1160 | gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) | |
1161 | { | |
1162 | struct gss_auth *gss_auth; | |
1163 | struct rpc_xprt *xprt = rcu_access_pointer(clnt->cl_xprt); | |
1164 | ||
1165 | while (clnt != clnt->cl_parent) { | |
1166 | struct rpc_clnt *parent = clnt->cl_parent; | |
1167 | /* Find the original parent for this transport */ | |
1168 | if (rcu_access_pointer(parent->cl_xprt) != xprt) | |
1169 | break; | |
1170 | clnt = parent; | |
1171 | } | |
1172 | ||
1173 | gss_auth = gss_create_hashed(args, clnt); | |
1174 | if (IS_ERR(gss_auth)) | |
1175 | return ERR_CAST(gss_auth); | |
1176 | return &gss_auth->rpc_auth; | |
1177 | } | |
1178 | ||
0df7fb74 TM |
1179 | /* |
1180 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
1181 | * to the server with the GSS control procedure field set to | |
1182 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
1183 | * all RPCSEC_GSS state associated with that context. | |
1184 | */ | |
1185 | static int | |
1186 | gss_destroying_context(struct rpc_cred *cred) | |
1187 | { | |
1188 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1189 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
1190 | struct rpc_task *task; | |
1191 | ||
1192 | if (gss_cred->gc_ctx == NULL || | |
6dcd3926 | 1193 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
0df7fb74 TM |
1194 | return 0; |
1195 | ||
1196 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
1197 | cred->cr_ops = &gss_nullops; | |
1198 | ||
1199 | /* Take a reference to ensure the cred will be destroyed either | |
1200 | * by the RPC call or by the put_rpccred() below */ | |
1201 | get_rpccred(cred); | |
1202 | ||
080a1f14 | 1203 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
0df7fb74 TM |
1204 | if (!IS_ERR(task)) |
1205 | rpc_put_task(task); | |
1206 | ||
1207 | put_rpccred(cred); | |
1208 | return 1; | |
1209 | } | |
1210 | ||
1211 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
1212 | * to create a new cred or context, so they check that things have been |
1213 | * allocated before freeing them. */ | |
1214 | static void | |
5d28dc82 | 1215 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 1216 | { |
632f0d05 | 1217 | dprintk("RPC: %s\n", __func__); |
1da177e4 | 1218 | |
0d8a3746 | 1219 | gss_delete_sec_context(&ctx->gc_gss_ctx); |
1da177e4 LT |
1220 | kfree(ctx->gc_wire_ctx.data); |
1221 | kfree(ctx); | |
1222 | } | |
1223 | ||
5d28dc82 TM |
1224 | static void |
1225 | gss_free_ctx_callback(struct rcu_head *head) | |
1226 | { | |
1227 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
1228 | gss_do_free_ctx(ctx); | |
1229 | } | |
1230 | ||
1231 | static void | |
1232 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
1233 | { | |
1234 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); | |
1235 | } | |
1236 | ||
1da177e4 | 1237 | static void |
31be5bf1 | 1238 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 1239 | { |
632f0d05 | 1240 | dprintk("RPC: %s cred=%p\n", __func__, gss_cred); |
31be5bf1 TM |
1241 | kfree(gss_cred); |
1242 | } | |
1da177e4 | 1243 | |
31be5bf1 TM |
1244 | static void |
1245 | gss_free_cred_callback(struct rcu_head *head) | |
1246 | { | |
1247 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
1248 | gss_free_cred(gss_cred); | |
1249 | } | |
1da177e4 | 1250 | |
31be5bf1 | 1251 | static void |
6dcd3926 | 1252 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 1253 | { |
5d28dc82 | 1254 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 1255 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
5d28dc82 TM |
1256 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
1257 | ||
a9b3cd7f | 1258 | RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); |
31be5bf1 | 1259 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
1260 | if (ctx) |
1261 | gss_put_ctx(ctx); | |
0285ed1f | 1262 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
1263 | } |
1264 | ||
6dcd3926 JL |
1265 | static void |
1266 | gss_destroy_cred(struct rpc_cred *cred) | |
1267 | { | |
1268 | ||
1269 | if (gss_destroying_context(cred)) | |
1270 | return; | |
1271 | gss_destroy_nullcred(cred); | |
1272 | } | |
1273 | ||
1da177e4 LT |
1274 | /* |
1275 | * Lookup RPCSEC_GSS cred for the current process | |
1276 | */ | |
1277 | static struct rpc_cred * | |
8a317760 | 1278 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 1279 | { |
8a317760 | 1280 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
1281 | } |
1282 | ||
1283 | static struct rpc_cred * | |
8a317760 | 1284 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
1285 | { |
1286 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1287 | struct gss_cred *cred = NULL; | |
1288 | int err = -ENOMEM; | |
1289 | ||
632f0d05 | 1290 | dprintk("RPC: %s for uid %d, flavor %d\n", |
cdba321e EB |
1291 | __func__, from_kuid(&init_user_ns, acred->uid), |
1292 | auth->au_flavor); | |
1da177e4 | 1293 | |
0f38b873 | 1294 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
1da177e4 LT |
1295 | goto out_err; |
1296 | ||
5fe4755e | 1297 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
1298 | /* |
1299 | * Note: in order to force a call to call_refresh(), we deliberately | |
1300 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
1301 | */ | |
fc432dd9 | 1302 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 1303 | cred->gc_service = gss_auth->service; |
68c97153 TM |
1304 | cred->gc_principal = NULL; |
1305 | if (acred->machine_cred) | |
1306 | cred->gc_principal = acred->principal; | |
0285ed1f | 1307 | kref_get(&gss_auth->kref); |
1da177e4 LT |
1308 | return &cred->gc_base; |
1309 | ||
1310 | out_err: | |
632f0d05 | 1311 | dprintk("RPC: %s failed with error %d\n", __func__, err); |
1da177e4 LT |
1312 | return ERR_PTR(err); |
1313 | } | |
1314 | ||
fba3bad4 TM |
1315 | static int |
1316 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
1317 | { | |
1318 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1319 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
1320 | int err; | |
1321 | ||
1322 | do { | |
1323 | err = gss_create_upcall(gss_auth, gss_cred); | |
1324 | } while (err == -EAGAIN); | |
1325 | return err; | |
1326 | } | |
1327 | ||
4de6caa2 AA |
1328 | /* |
1329 | * Returns -EACCES if GSS context is NULL or will expire within the | |
1330 | * timeout (miliseconds) | |
1331 | */ | |
1332 | static int | |
1333 | gss_key_timeout(struct rpc_cred *rc) | |
1334 | { | |
1335 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
1336 | unsigned long now = jiffies; | |
1337 | unsigned long expire; | |
1338 | ||
1339 | if (gss_cred->gc_ctx == NULL) | |
1340 | return -EACCES; | |
1341 | ||
1342 | expire = gss_cred->gc_ctx->gc_expiry - (gss_key_expire_timeo * HZ); | |
1343 | ||
1344 | if (time_after(now, expire)) | |
1345 | return -EACCES; | |
1346 | return 0; | |
1347 | } | |
1348 | ||
1da177e4 | 1349 | static int |
8a317760 | 1350 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
1351 | { |
1352 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
4de6caa2 | 1353 | int ret; |
1da177e4 | 1354 | |
cd019f75 | 1355 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 1356 | goto out; |
1da177e4 | 1357 | /* Don't match with creds that have expired. */ |
cd019f75 TM |
1358 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
1359 | return 0; | |
1360 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1da177e4 | 1361 | return 0; |
8a317760 | 1362 | out: |
68c97153 TM |
1363 | if (acred->principal != NULL) { |
1364 | if (gss_cred->gc_principal == NULL) | |
1365 | return 0; | |
4de6caa2 AA |
1366 | ret = strcmp(acred->principal, gss_cred->gc_principal) == 0; |
1367 | goto check_expire; | |
68c97153 TM |
1368 | } |
1369 | if (gss_cred->gc_principal != NULL) | |
7c67db3a | 1370 | return 0; |
4de6caa2 AA |
1371 | ret = uid_eq(rc->cr_uid, acred->uid); |
1372 | ||
1373 | check_expire: | |
1374 | if (ret == 0) | |
1375 | return ret; | |
1376 | ||
1377 | /* Notify acred users of GSS context expiration timeout */ | |
1378 | if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) && | |
1379 | (gss_key_timeout(rc) != 0)) { | |
1380 | /* test will now be done from generic cred */ | |
1381 | test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags); | |
1382 | /* tell NFS layer that key will expire soon */ | |
1383 | set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags); | |
1384 | } | |
1385 | return ret; | |
1da177e4 LT |
1386 | } |
1387 | ||
1388 | /* | |
1389 | * Marshal credentials. | |
1390 | * Maybe we should keep a cached credential for performance reasons. | |
1391 | */ | |
d8ed029d AD |
1392 | static __be32 * |
1393 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1394 | { |
a17c2153 TM |
1395 | struct rpc_rqst *req = task->tk_rqstp; |
1396 | struct rpc_cred *cred = req->rq_cred; | |
1da177e4 LT |
1397 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1398 | gc_base); | |
1399 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1400 | __be32 *cred_len; |
1da177e4 LT |
1401 | u32 maj_stat = 0; |
1402 | struct xdr_netobj mic; | |
1403 | struct kvec iov; | |
1404 | struct xdr_buf verf_buf; | |
1405 | ||
632f0d05 | 1406 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1407 | |
1408 | *p++ = htonl(RPC_AUTH_GSS); | |
1409 | cred_len = p++; | |
1410 | ||
1411 | spin_lock(&ctx->gc_seq_lock); | |
1412 | req->rq_seqno = ctx->gc_seq++; | |
1413 | spin_unlock(&ctx->gc_seq_lock); | |
1414 | ||
1415 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
1416 | *p++ = htonl((u32) ctx->gc_proc); | |
1417 | *p++ = htonl((u32) req->rq_seqno); | |
1418 | *p++ = htonl((u32) gss_cred->gc_service); | |
1419 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
1420 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
1421 | ||
1422 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
1423 | * starting with the xid and ending at the end of the credential: */ | |
a4f0835c | 1424 | iov.iov_base = xprt_skip_transport_header(req->rq_xprt, |
808012fb | 1425 | req->rq_snd_buf.head[0].iov_base); |
1da177e4 LT |
1426 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
1427 | xdr_buf_from_iov(&iov, &verf_buf); | |
1428 | ||
1429 | /* set verifier flavor*/ | |
1430 | *p++ = htonl(RPC_AUTH_GSS); | |
1431 | ||
1432 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 1433 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1434 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 1435 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1436 | } else if (maj_stat != 0) { |
1437 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
1438 | goto out_put_ctx; | |
1439 | } | |
1440 | p = xdr_encode_opaque(p, NULL, mic.len); | |
1441 | gss_put_ctx(ctx); | |
1442 | return p; | |
1443 | out_put_ctx: | |
1444 | gss_put_ctx(ctx); | |
1445 | return NULL; | |
1446 | } | |
1447 | ||
cd019f75 TM |
1448 | static int gss_renew_cred(struct rpc_task *task) |
1449 | { | |
a17c2153 | 1450 | struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1451 | struct gss_cred *gss_cred = container_of(oldcred, |
1452 | struct gss_cred, | |
1453 | gc_base); | |
1454 | struct rpc_auth *auth = oldcred->cr_auth; | |
1455 | struct auth_cred acred = { | |
1456 | .uid = oldcred->cr_uid, | |
68c97153 TM |
1457 | .principal = gss_cred->gc_principal, |
1458 | .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), | |
cd019f75 TM |
1459 | }; |
1460 | struct rpc_cred *new; | |
1461 | ||
1462 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
1463 | if (IS_ERR(new)) | |
1464 | return PTR_ERR(new); | |
a17c2153 | 1465 | task->tk_rqstp->rq_cred = new; |
cd019f75 TM |
1466 | put_rpccred(oldcred); |
1467 | return 0; | |
1468 | } | |
1469 | ||
126e216a TM |
1470 | static int gss_cred_is_negative_entry(struct rpc_cred *cred) |
1471 | { | |
1472 | if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { | |
1473 | unsigned long now = jiffies; | |
1474 | unsigned long begin, expire; | |
1475 | struct gss_cred *gss_cred; | |
1476 | ||
1477 | gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1478 | begin = gss_cred->gc_upcall_timestamp; | |
1479 | expire = begin + gss_expired_cred_retry_delay * HZ; | |
1480 | ||
1481 | if (time_in_range_open(now, begin, expire)) | |
1482 | return 1; | |
1483 | } | |
1484 | return 0; | |
1485 | } | |
1486 | ||
1da177e4 LT |
1487 | /* |
1488 | * Refresh credentials. XXX - finish | |
1489 | */ | |
1490 | static int | |
1491 | gss_refresh(struct rpc_task *task) | |
1492 | { | |
a17c2153 | 1493 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1494 | int ret = 0; |
1495 | ||
126e216a TM |
1496 | if (gss_cred_is_negative_entry(cred)) |
1497 | return -EKEYEXPIRED; | |
1498 | ||
cd019f75 TM |
1499 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
1500 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
1501 | ret = gss_renew_cred(task); | |
1502 | if (ret < 0) | |
1503 | goto out; | |
a17c2153 | 1504 | cred = task->tk_rqstp->rq_cred; |
cd019f75 | 1505 | } |
1da177e4 | 1506 | |
cd019f75 TM |
1507 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
1508 | ret = gss_refresh_upcall(task); | |
1509 | out: | |
1510 | return ret; | |
1da177e4 LT |
1511 | } |
1512 | ||
0df7fb74 TM |
1513 | /* Dummy refresh routine: used only when destroying the context */ |
1514 | static int | |
1515 | gss_refresh_null(struct rpc_task *task) | |
1516 | { | |
c297c8b9 | 1517 | return 0; |
0df7fb74 TM |
1518 | } |
1519 | ||
d8ed029d AD |
1520 | static __be32 * |
1521 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1522 | { |
a17c2153 | 1523 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 | 1524 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 1525 | __be32 seq; |
1da177e4 LT |
1526 | struct kvec iov; |
1527 | struct xdr_buf verf_buf; | |
1528 | struct xdr_netobj mic; | |
1529 | u32 flav,len; | |
1530 | u32 maj_stat; | |
35fa5f7b | 1531 | __be32 *ret = ERR_PTR(-EIO); |
1da177e4 | 1532 | |
632f0d05 | 1533 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1534 | |
1535 | flav = ntohl(*p++); | |
1536 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 1537 | goto out_bad; |
1da177e4 LT |
1538 | if (flav != RPC_AUTH_GSS) |
1539 | goto out_bad; | |
1540 | seq = htonl(task->tk_rqstp->rq_seqno); | |
1541 | iov.iov_base = &seq; | |
1542 | iov.iov_len = sizeof(seq); | |
1543 | xdr_buf_from_iov(&iov, &verf_buf); | |
1544 | mic.data = (u8 *)p; | |
1545 | mic.len = len; | |
1546 | ||
35fa5f7b | 1547 | ret = ERR_PTR(-EACCES); |
00fd6e14 | 1548 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1549 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1550 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 1551 | if (maj_stat) { |
632f0d05 CL |
1552 | dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", |
1553 | task->tk_pid, __func__, maj_stat); | |
1da177e4 | 1554 | goto out_bad; |
0df7fb74 | 1555 | } |
24b2605b BF |
1556 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1557 | * calculate the length of the verifier: */ | |
1be27f36 | 1558 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 1559 | gss_put_ctx(ctx); |
632f0d05 CL |
1560 | dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", |
1561 | task->tk_pid, __func__); | |
1da177e4 LT |
1562 | return p + XDR_QUADLEN(len); |
1563 | out_bad: | |
1564 | gss_put_ctx(ctx); | |
35fa5f7b AA |
1565 | dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__, |
1566 | PTR_ERR(ret)); | |
1567 | return ret; | |
1da177e4 LT |
1568 | } |
1569 | ||
9f06c719 CL |
1570 | static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, |
1571 | __be32 *p, void *obj) | |
1572 | { | |
1573 | struct xdr_stream xdr; | |
1574 | ||
1575 | xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); | |
1576 | encode(rqstp, &xdr, obj); | |
1577 | } | |
1578 | ||
1da177e4 LT |
1579 | static inline int |
1580 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1581 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1582 | __be32 *p, void *obj) | |
1da177e4 LT |
1583 | { |
1584 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1585 | struct xdr_buf integ_buf; | |
d8ed029d | 1586 | __be32 *integ_len = NULL; |
1da177e4 | 1587 | struct xdr_netobj mic; |
d8ed029d AD |
1588 | u32 offset; |
1589 | __be32 *q; | |
1da177e4 LT |
1590 | struct kvec *iov; |
1591 | u32 maj_stat = 0; | |
1592 | int status = -EIO; | |
1593 | ||
1594 | integ_len = p++; | |
1595 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1596 | *p++ = htonl(rqstp->rq_seqno); | |
1597 | ||
9f06c719 | 1598 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1da177e4 LT |
1599 | |
1600 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1601 | offset, snd_buf->len - offset)) | |
1602 | return status; | |
1603 | *integ_len = htonl(integ_buf.len); | |
1604 | ||
1605 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1606 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1607 | iov = snd_buf->tail; |
1608 | else | |
1609 | iov = snd_buf->head; | |
1610 | p = iov->iov_base + iov->iov_len; | |
1611 | mic.data = (u8 *)(p + 1); | |
1612 | ||
00fd6e14 | 1613 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1614 | status = -EIO; /* XXX? */ |
1615 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1616 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1617 | else if (maj_stat) |
1618 | return status; | |
1619 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1620 | ||
1621 | offset = (u8 *)q - (u8 *)p; | |
1622 | iov->iov_len += offset; | |
1623 | snd_buf->len += offset; | |
1624 | return 0; | |
1625 | } | |
1626 | ||
2d2da60c BF |
1627 | static void |
1628 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1629 | { | |
1630 | int i; | |
1631 | ||
1632 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1633 | __free_page(rqstp->rq_enc_pages[i]); | |
1634 | kfree(rqstp->rq_enc_pages); | |
1635 | } | |
1636 | ||
1637 | static int | |
1638 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1639 | { | |
1640 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1641 | int first, last, i; | |
1642 | ||
1643 | if (snd_buf->page_len == 0) { | |
1644 | rqstp->rq_enc_pages_num = 0; | |
1645 | return 0; | |
1646 | } | |
1647 | ||
1648 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1649 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1650 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1651 | rqstp->rq_enc_pages | |
1652 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1653 | GFP_NOFS); | |
1654 | if (!rqstp->rq_enc_pages) | |
1655 | goto out; | |
1656 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1657 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1658 | if (rqstp->rq_enc_pages[i] == NULL) | |
1659 | goto out_free; | |
1660 | } | |
1661 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1662 | return 0; | |
1663 | out_free: | |
cdead7cf TM |
1664 | rqstp->rq_enc_pages_num = i; |
1665 | priv_release_snd_buf(rqstp); | |
2d2da60c BF |
1666 | out: |
1667 | return -EAGAIN; | |
1668 | } | |
1669 | ||
1670 | static inline int | |
1671 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1672 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1673 | __be32 *p, void *obj) | |
2d2da60c BF |
1674 | { |
1675 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1676 | u32 offset; | |
1677 | u32 maj_stat; | |
1678 | int status; | |
d8ed029d | 1679 | __be32 *opaque_len; |
2d2da60c BF |
1680 | struct page **inpages; |
1681 | int first; | |
1682 | int pad; | |
1683 | struct kvec *iov; | |
1684 | char *tmp; | |
1685 | ||
1686 | opaque_len = p++; | |
1687 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1688 | *p++ = htonl(rqstp->rq_seqno); | |
1689 | ||
9f06c719 | 1690 | gss_wrap_req_encode(encode, rqstp, p, obj); |
2d2da60c BF |
1691 | |
1692 | status = alloc_enc_pages(rqstp); | |
1693 | if (status) | |
1694 | return status; | |
1695 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1696 | inpages = snd_buf->pages + first; | |
1697 | snd_buf->pages = rqstp->rq_enc_pages; | |
1698 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
7561042f KC |
1699 | /* |
1700 | * Give the tail its own page, in case we need extra space in the | |
1701 | * head when wrapping: | |
1702 | * | |
1703 | * call_allocate() allocates twice the slack space required | |
1704 | * by the authentication flavor to rq_callsize. | |
1705 | * For GSS, slack is GSS_CRED_SLACK. | |
1706 | */ | |
2d2da60c BF |
1707 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
1708 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1709 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1710 | snd_buf->tail[0].iov_base = tmp; | |
1711 | } | |
00fd6e14 | 1712 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
7561042f | 1713 | /* slack space should prevent this ever happening: */ |
2d2da60c | 1714 | BUG_ON(snd_buf->len > snd_buf->buflen); |
cca5172a | 1715 | status = -EIO; |
2d2da60c BF |
1716 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1717 | * done anyway, so it's safe to put the request on the wire: */ | |
1718 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1719 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1720 | else if (maj_stat) |
1721 | return status; | |
1722 | ||
1723 | *opaque_len = htonl(snd_buf->len - offset); | |
1724 | /* guess whether we're in the head or the tail: */ | |
1725 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1726 | iov = snd_buf->tail; | |
1727 | else | |
1728 | iov = snd_buf->head; | |
1729 | p = iov->iov_base + iov->iov_len; | |
1730 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1731 | memset(p, 0, pad); | |
1732 | iov->iov_len += pad; | |
1733 | snd_buf->len += pad; | |
1734 | ||
1735 | return 0; | |
1736 | } | |
1737 | ||
1da177e4 LT |
1738 | static int |
1739 | gss_wrap_req(struct rpc_task *task, | |
9f06c719 | 1740 | kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1741 | { |
a17c2153 | 1742 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1743 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1744 | gc_base); | |
1745 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1746 | int status = -EIO; | |
1747 | ||
632f0d05 | 1748 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1749 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1750 | /* The spec seems a little ambiguous here, but I think that not | |
1751 | * wrapping context destruction requests makes the most sense. | |
1752 | */ | |
9f06c719 CL |
1753 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1754 | status = 0; | |
1da177e4 LT |
1755 | goto out; |
1756 | } | |
1757 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1758 | case RPC_GSS_SVC_NONE: |
1759 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1760 | status = 0; | |
1761 | break; | |
1762 | case RPC_GSS_SVC_INTEGRITY: | |
1763 | status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); | |
1764 | break; | |
1765 | case RPC_GSS_SVC_PRIVACY: | |
1766 | status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); | |
1767 | break; | |
1da177e4 LT |
1768 | } |
1769 | out: | |
1770 | gss_put_ctx(ctx); | |
632f0d05 | 1771 | dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); |
1da177e4 LT |
1772 | return status; |
1773 | } | |
1774 | ||
1775 | static inline int | |
1776 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1777 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1778 | { |
1779 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1780 | struct xdr_buf integ_buf; | |
1781 | struct xdr_netobj mic; | |
1782 | u32 data_offset, mic_offset; | |
1783 | u32 integ_len; | |
1784 | u32 maj_stat; | |
1785 | int status = -EIO; | |
1786 | ||
1787 | integ_len = ntohl(*(*p)++); | |
1788 | if (integ_len & 3) | |
1789 | return status; | |
1790 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1791 | mic_offset = integ_len + data_offset; | |
1792 | if (mic_offset > rcv_buf->len) | |
1793 | return status; | |
1794 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1795 | return status; | |
1796 | ||
1797 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1798 | mic_offset - data_offset)) | |
1799 | return status; | |
1800 | ||
1801 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1802 | return status; | |
1803 | ||
00fd6e14 | 1804 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1805 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1806 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1807 | if (maj_stat != GSS_S_COMPLETE) |
1808 | return status; | |
1809 | return 0; | |
1810 | } | |
1811 | ||
2d2da60c BF |
1812 | static inline int |
1813 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1814 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1815 | { |
1816 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1817 | u32 offset; | |
1818 | u32 opaque_len; | |
1819 | u32 maj_stat; | |
1820 | int status = -EIO; | |
1821 | ||
1822 | opaque_len = ntohl(*(*p)++); | |
1823 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1824 | if (offset + opaque_len > rcv_buf->len) | |
1825 | return status; | |
1826 | /* remove padding: */ | |
1827 | rcv_buf->len = offset + opaque_len; | |
1828 | ||
00fd6e14 | 1829 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1830 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1831 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1832 | if (maj_stat != GSS_S_COMPLETE) |
1833 | return status; | |
1834 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1835 | return status; | |
1836 | ||
1837 | return 0; | |
1838 | } | |
1839 | ||
bf269551 CL |
1840 | static int |
1841 | gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, | |
1842 | __be32 *p, void *obj) | |
1843 | { | |
1844 | struct xdr_stream xdr; | |
1845 | ||
1846 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
1847 | return decode(rqstp, &xdr, obj); | |
1848 | } | |
2d2da60c | 1849 | |
1da177e4 LT |
1850 | static int |
1851 | gss_unwrap_resp(struct rpc_task *task, | |
bf269551 | 1852 | kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1853 | { |
a17c2153 | 1854 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1855 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1856 | gc_base); | |
1857 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1858 | __be32 *savedp = p; |
2d2da60c BF |
1859 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1860 | int savedlen = head->iov_len; | |
1da177e4 LT |
1861 | int status = -EIO; |
1862 | ||
1863 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1864 | goto out_decode; | |
1865 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1866 | case RPC_GSS_SVC_NONE: |
1867 | break; | |
1868 | case RPC_GSS_SVC_INTEGRITY: | |
1869 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1870 | if (status) | |
1871 | goto out; | |
1872 | break; | |
1873 | case RPC_GSS_SVC_PRIVACY: | |
1874 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); | |
1875 | if (status) | |
1876 | goto out; | |
1877 | break; | |
1da177e4 | 1878 | } |
24b2605b | 1879 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 1880 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 1881 | + (savedlen - head->iov_len); |
1da177e4 | 1882 | out_decode: |
bf269551 | 1883 | status = gss_unwrap_req_decode(decode, rqstp, p, obj); |
1da177e4 LT |
1884 | out: |
1885 | gss_put_ctx(ctx); | |
632f0d05 CL |
1886 | dprintk("RPC: %5u %s returning %d\n", |
1887 | task->tk_pid, __func__, status); | |
1da177e4 LT |
1888 | return status; |
1889 | } | |
cca5172a | 1890 | |
f1c0a861 | 1891 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1892 | .owner = THIS_MODULE, |
1893 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 1894 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
1895 | .create = gss_create, |
1896 | .destroy = gss_destroy, | |
1897 | .lookup_cred = gss_lookup_cred, | |
80df9d20 | 1898 | .crcreate = gss_create_cred, |
6a1a1e34 | 1899 | .list_pseudoflavors = gss_mech_list_pseudoflavors, |
9568c5e9 | 1900 | .info2flavor = gss_mech_info2flavor, |
a77c806f | 1901 | .flavor2info = gss_mech_flavor2info, |
1da177e4 LT |
1902 | }; |
1903 | ||
f1c0a861 | 1904 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1905 | .cr_name = "AUTH_GSS", |
1906 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1907 | .cr_init = gss_cred_init, |
5c691044 | 1908 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
1909 | .crmatch = gss_match, |
1910 | .crmarshal = gss_marshal, | |
1911 | .crrefresh = gss_refresh, | |
1912 | .crvalidate = gss_validate, | |
1913 | .crwrap_req = gss_wrap_req, | |
1914 | .crunwrap_resp = gss_unwrap_resp, | |
4de6caa2 | 1915 | .crkey_timeout = gss_key_timeout, |
1da177e4 LT |
1916 | }; |
1917 | ||
0df7fb74 TM |
1918 | static const struct rpc_credops gss_nullops = { |
1919 | .cr_name = "AUTH_GSS", | |
6dcd3926 | 1920 | .crdestroy = gss_destroy_nullcred, |
5c691044 | 1921 | .crbind = rpcauth_generic_bind_cred, |
0df7fb74 TM |
1922 | .crmatch = gss_match, |
1923 | .crmarshal = gss_marshal, | |
1924 | .crrefresh = gss_refresh_null, | |
1925 | .crvalidate = gss_validate, | |
1926 | .crwrap_req = gss_wrap_req, | |
1927 | .crunwrap_resp = gss_unwrap_resp, | |
1928 | }; | |
1929 | ||
b693ba4a | 1930 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
c1225158 | 1931 | .upcall = rpc_pipe_generic_upcall, |
34769fc4 BF |
1932 | .downcall = gss_pipe_downcall, |
1933 | .destroy_msg = gss_pipe_destroy_msg, | |
1934 | .open_pipe = gss_pipe_open_v0, | |
1935 | .release_pipe = gss_pipe_release, | |
1936 | }; | |
1937 | ||
b693ba4a | 1938 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
c1225158 | 1939 | .upcall = rpc_pipe_generic_upcall, |
1da177e4 LT |
1940 | .downcall = gss_pipe_downcall, |
1941 | .destroy_msg = gss_pipe_destroy_msg, | |
34769fc4 | 1942 | .open_pipe = gss_pipe_open_v1, |
1da177e4 LT |
1943 | .release_pipe = gss_pipe_release, |
1944 | }; | |
1945 | ||
a1db410d SK |
1946 | static __net_init int rpcsec_gss_init_net(struct net *net) |
1947 | { | |
1948 | return gss_svc_init_net(net); | |
1949 | } | |
1950 | ||
1951 | static __net_exit void rpcsec_gss_exit_net(struct net *net) | |
1952 | { | |
1953 | gss_svc_shutdown_net(net); | |
1954 | } | |
1955 | ||
1956 | static struct pernet_operations rpcsec_gss_net_ops = { | |
1957 | .init = rpcsec_gss_init_net, | |
1958 | .exit = rpcsec_gss_exit_net, | |
1959 | }; | |
1960 | ||
1da177e4 LT |
1961 | /* |
1962 | * Initialize RPCSEC_GSS module | |
1963 | */ | |
1964 | static int __init init_rpcsec_gss(void) | |
1965 | { | |
1966 | int err = 0; | |
1967 | ||
1968 | err = rpcauth_register(&authgss_ops); | |
1969 | if (err) | |
1970 | goto out; | |
1971 | err = gss_svc_init(); | |
1972 | if (err) | |
1973 | goto out_unregister; | |
a1db410d SK |
1974 | err = register_pernet_subsys(&rpcsec_gss_net_ops); |
1975 | if (err) | |
1976 | goto out_svc_exit; | |
79a3f20b | 1977 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
1da177e4 | 1978 | return 0; |
a1db410d SK |
1979 | out_svc_exit: |
1980 | gss_svc_shutdown(); | |
1da177e4 LT |
1981 | out_unregister: |
1982 | rpcauth_unregister(&authgss_ops); | |
1983 | out: | |
1984 | return err; | |
1985 | } | |
1986 | ||
1987 | static void __exit exit_rpcsec_gss(void) | |
1988 | { | |
a1db410d | 1989 | unregister_pernet_subsys(&rpcsec_gss_net_ops); |
1da177e4 LT |
1990 | gss_svc_shutdown(); |
1991 | rpcauth_unregister(&authgss_ops); | |
bf12691d | 1992 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1993 | } |
1994 | ||
71afa85e | 1995 | MODULE_ALIAS("rpc-auth-6"); |
1da177e4 | 1996 | MODULE_LICENSE("GPL"); |
126e216a TM |
1997 | module_param_named(expired_cred_retry_delay, |
1998 | gss_expired_cred_retry_delay, | |
1999 | uint, 0644); | |
2000 | MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " | |
2001 | "the RPC engine retries an expired credential"); | |
2002 | ||
4de6caa2 AA |
2003 | module_param_named(key_expire_timeo, |
2004 | gss_key_expire_timeo, | |
2005 | uint, 0644); | |
2006 | MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a " | |
2007 | "credential keys lifetime where the NFS layer cleans up " | |
2008 | "prior to key expiration"); | |
2009 | ||
1da177e4 LT |
2010 | module_init(init_rpcsec_gss) |
2011 | module_exit(exit_rpcsec_gss) |