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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); | |
9eb2ddb4 | 111 | static void gss_put_auth(struct gss_auth *gss_auth); |
cf81939d | 112 | |
5d28dc82 | 113 | static void gss_free_ctx(struct gss_cl_ctx *); |
b693ba4a TM |
114 | static const struct rpc_pipe_ops gss_upcall_ops_v0; |
115 | static const struct rpc_pipe_ops gss_upcall_ops_v1; | |
1da177e4 | 116 | |
1da177e4 LT |
117 | static inline struct gss_cl_ctx * |
118 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
119 | { | |
120 | atomic_inc(&ctx->count); | |
121 | return ctx; | |
122 | } | |
123 | ||
124 | static inline void | |
125 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
126 | { | |
127 | if (atomic_dec_and_test(&ctx->count)) | |
5d28dc82 | 128 | gss_free_ctx(ctx); |
1da177e4 LT |
129 | } |
130 | ||
5d28dc82 TM |
131 | /* gss_cred_set_ctx: |
132 | * called by gss_upcall_callback and gss_create_upcall in order | |
133 | * to set the gss context. The actual exchange of an old context | |
9beae467 | 134 | * and a new one is protected by the pipe->lock. |
5d28dc82 | 135 | */ |
1da177e4 LT |
136 | static void |
137 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
138 | { | |
139 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
5d28dc82 | 140 | |
cd019f75 TM |
141 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
142 | return; | |
7b6962b0 | 143 | gss_get_ctx(ctx); |
cf778b00 | 144 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 | 145 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
cd019f75 | 146 | smp_mb__before_clear_bit(); |
fc432dd9 | 147 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
1da177e4 LT |
148 | } |
149 | ||
150 | static const void * | |
151 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
152 | { | |
153 | const void *q = (const void *)((const char *)p + len); | |
154 | if (unlikely(q > end || q < p)) | |
155 | return ERR_PTR(-EFAULT); | |
156 | memcpy(res, p, len); | |
157 | return q; | |
158 | } | |
159 | ||
160 | static inline const void * | |
161 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
162 | { | |
163 | const void *q; | |
164 | unsigned int len; | |
165 | ||
166 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
167 | if (IS_ERR(p)) | |
168 | return p; | |
169 | q = (const void *)((const char *)p + len); | |
170 | if (unlikely(q > end || q < p)) | |
171 | return ERR_PTR(-EFAULT); | |
0f38b873 | 172 | dest->data = kmemdup(p, len, GFP_NOFS); |
1da177e4 LT |
173 | if (unlikely(dest->data == NULL)) |
174 | return ERR_PTR(-ENOMEM); | |
175 | dest->len = len; | |
1da177e4 LT |
176 | return q; |
177 | } | |
178 | ||
179 | static struct gss_cl_ctx * | |
180 | gss_cred_get_ctx(struct rpc_cred *cred) | |
181 | { | |
182 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
183 | struct gss_cl_ctx *ctx = NULL; | |
184 | ||
5d28dc82 | 185 | rcu_read_lock(); |
1da177e4 LT |
186 | if (gss_cred->gc_ctx) |
187 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
5d28dc82 | 188 | rcu_read_unlock(); |
1da177e4 LT |
189 | return ctx; |
190 | } | |
191 | ||
192 | static struct gss_cl_ctx * | |
193 | gss_alloc_context(void) | |
194 | { | |
195 | struct gss_cl_ctx *ctx; | |
196 | ||
0f38b873 | 197 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
1da177e4 | 198 | if (ctx != NULL) { |
1da177e4 LT |
199 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
200 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
201 | spin_lock_init(&ctx->gc_seq_lock); | |
202 | atomic_set(&ctx->count,1); | |
203 | } | |
204 | return ctx; | |
205 | } | |
206 | ||
207 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
208 | static const void * | |
209 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
210 | { | |
211 | const void *q; | |
212 | unsigned int seclen; | |
213 | unsigned int timeout; | |
620038f6 | 214 | unsigned long now = jiffies; |
1da177e4 LT |
215 | u32 window_size; |
216 | int ret; | |
217 | ||
620038f6 AA |
218 | /* First unsigned int gives the remaining lifetime in seconds of the |
219 | * credential - e.g. the remaining TGT lifetime for Kerberos or | |
220 | * the -t value passed to GSSD. | |
221 | */ | |
1da177e4 LT |
222 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); |
223 | if (IS_ERR(p)) | |
224 | goto err; | |
225 | if (timeout == 0) | |
226 | timeout = GSSD_MIN_TIMEOUT; | |
620038f6 AA |
227 | ctx->gc_expiry = now + ((unsigned long)timeout * HZ); |
228 | /* Sequence number window. Determines the maximum number of | |
229 | * simultaneous requests | |
230 | */ | |
1da177e4 LT |
231 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); |
232 | if (IS_ERR(p)) | |
233 | goto err; | |
234 | ctx->gc_win = window_size; | |
235 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
236 | if (ctx->gc_win == 0) { | |
dc5ddce9 JL |
237 | /* |
238 | * in which case, p points to an error code. Anything other | |
239 | * than -EKEYEXPIRED gets converted to -EACCES. | |
240 | */ | |
241 | p = simple_get_bytes(p, end, &ret, sizeof(ret)); | |
242 | if (!IS_ERR(p)) | |
243 | p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : | |
244 | ERR_PTR(-EACCES); | |
1da177e4 LT |
245 | goto err; |
246 | } | |
247 | /* copy the opaque wire context */ | |
248 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
249 | if (IS_ERR(p)) | |
250 | goto err; | |
251 | /* import the opaque security context */ | |
252 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
253 | if (IS_ERR(p)) | |
254 | goto err; | |
255 | q = (const void *)((const char *)p + seclen); | |
256 | if (unlikely(q > end || q < p)) { | |
257 | p = ERR_PTR(-EFAULT); | |
258 | goto err; | |
259 | } | |
400f26b5 | 260 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); |
1da177e4 LT |
261 | if (ret < 0) { |
262 | p = ERR_PTR(ret); | |
263 | goto err; | |
264 | } | |
620038f6 AA |
265 | dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u\n", |
266 | __func__, ctx->gc_expiry, now, timeout); | |
1da177e4 LT |
267 | return q; |
268 | err: | |
173db309 | 269 | dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); |
1da177e4 LT |
270 | return p; |
271 | } | |
272 | ||
34769fc4 | 273 | #define UPCALL_BUF_LEN 128 |
1da177e4 LT |
274 | |
275 | struct gss_upcall_msg { | |
276 | atomic_t count; | |
7eaf040b | 277 | kuid_t uid; |
1da177e4 LT |
278 | struct rpc_pipe_msg msg; |
279 | struct list_head list; | |
280 | struct gss_auth *auth; | |
9beae467 | 281 | struct rpc_pipe *pipe; |
1da177e4 LT |
282 | struct rpc_wait_queue rpc_waitqueue; |
283 | wait_queue_head_t waitqueue; | |
284 | struct gss_cl_ctx *ctx; | |
34769fc4 | 285 | char databuf[UPCALL_BUF_LEN]; |
1da177e4 LT |
286 | }; |
287 | ||
2aed8b47 | 288 | static int get_pipe_version(struct net *net) |
79a3f20b | 289 | { |
2aed8b47 | 290 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
79a3f20b BF |
291 | int ret; |
292 | ||
293 | spin_lock(&pipe_version_lock); | |
2aed8b47 TM |
294 | if (sn->pipe_version >= 0) { |
295 | atomic_inc(&sn->pipe_users); | |
296 | ret = sn->pipe_version; | |
79a3f20b BF |
297 | } else |
298 | ret = -EAGAIN; | |
299 | spin_unlock(&pipe_version_lock); | |
300 | return ret; | |
301 | } | |
302 | ||
2aed8b47 | 303 | static void put_pipe_version(struct net *net) |
79a3f20b | 304 | { |
2aed8b47 TM |
305 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
306 | ||
307 | if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { | |
308 | sn->pipe_version = -1; | |
79a3f20b BF |
309 | spin_unlock(&pipe_version_lock); |
310 | } | |
311 | } | |
312 | ||
1da177e4 LT |
313 | static void |
314 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
315 | { | |
e726340a | 316 | struct net *net = gss_msg->auth->net; |
1da177e4 LT |
317 | if (!atomic_dec_and_test(&gss_msg->count)) |
318 | return; | |
2aed8b47 | 319 | put_pipe_version(net); |
1da177e4 LT |
320 | BUG_ON(!list_empty(&gss_msg->list)); |
321 | if (gss_msg->ctx != NULL) | |
322 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 323 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
9eb2ddb4 | 324 | gss_put_auth(gss_msg->auth); |
1da177e4 LT |
325 | kfree(gss_msg); |
326 | } | |
327 | ||
328 | static struct gss_upcall_msg * | |
7eaf040b | 329 | __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid) |
1da177e4 LT |
330 | { |
331 | struct gss_upcall_msg *pos; | |
9beae467 | 332 | list_for_each_entry(pos, &pipe->in_downcall, list) { |
0b4d51b0 | 333 | if (!uid_eq(pos->uid, uid)) |
1da177e4 LT |
334 | continue; |
335 | atomic_inc(&pos->count); | |
632f0d05 | 336 | dprintk("RPC: %s found msg %p\n", __func__, pos); |
1da177e4 LT |
337 | return pos; |
338 | } | |
632f0d05 | 339 | dprintk("RPC: %s found nothing\n", __func__); |
1da177e4 LT |
340 | return NULL; |
341 | } | |
342 | ||
720b8f2d | 343 | /* Try to add an upcall to the pipefs queue. |
1da177e4 LT |
344 | * If an upcall owned by our uid already exists, then we return a reference |
345 | * to that upcall instead of adding the new upcall. | |
346 | */ | |
347 | static inline struct gss_upcall_msg * | |
053e324f | 348 | gss_add_msg(struct gss_upcall_msg *gss_msg) |
1da177e4 | 349 | { |
9beae467 | 350 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 LT |
351 | struct gss_upcall_msg *old; |
352 | ||
9beae467 SK |
353 | spin_lock(&pipe->lock); |
354 | old = __gss_find_upcall(pipe, gss_msg->uid); | |
1da177e4 LT |
355 | if (old == NULL) { |
356 | atomic_inc(&gss_msg->count); | |
9beae467 | 357 | list_add(&gss_msg->list, &pipe->in_downcall); |
1da177e4 LT |
358 | } else |
359 | gss_msg = old; | |
9beae467 | 360 | spin_unlock(&pipe->lock); |
1da177e4 LT |
361 | return gss_msg; |
362 | } | |
363 | ||
364 | static void | |
365 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
366 | { | |
1da177e4 LT |
367 | list_del_init(&gss_msg->list); |
368 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
369 | wake_up_all(&gss_msg->waitqueue); | |
370 | atomic_dec(&gss_msg->count); | |
371 | } | |
372 | ||
373 | static void | |
374 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
375 | { | |
9beae467 | 376 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 377 | |
3b68aaea TM |
378 | if (list_empty(&gss_msg->list)) |
379 | return; | |
9beae467 | 380 | spin_lock(&pipe->lock); |
3b68aaea TM |
381 | if (!list_empty(&gss_msg->list)) |
382 | __gss_unhash_msg(gss_msg); | |
9beae467 | 383 | spin_unlock(&pipe->lock); |
1da177e4 LT |
384 | } |
385 | ||
126e216a TM |
386 | static void |
387 | gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) | |
388 | { | |
389 | switch (gss_msg->msg.errno) { | |
390 | case 0: | |
391 | if (gss_msg->ctx == NULL) | |
392 | break; | |
393 | clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
394 | gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); | |
395 | break; | |
396 | case -EKEYEXPIRED: | |
397 | set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
398 | } | |
399 | gss_cred->gc_upcall_timestamp = jiffies; | |
400 | gss_cred->gc_upcall = NULL; | |
401 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
402 | } | |
403 | ||
1da177e4 LT |
404 | static void |
405 | gss_upcall_callback(struct rpc_task *task) | |
406 | { | |
a17c2153 | 407 | struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, |
1da177e4 LT |
408 | struct gss_cred, gc_base); |
409 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
9beae467 | 410 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 411 | |
9beae467 | 412 | spin_lock(&pipe->lock); |
126e216a | 413 | gss_handle_downcall_result(gss_cred, gss_msg); |
9beae467 | 414 | spin_unlock(&pipe->lock); |
126e216a | 415 | task->tk_status = gss_msg->msg.errno; |
1da177e4 LT |
416 | gss_release_msg(gss_msg); |
417 | } | |
418 | ||
34769fc4 BF |
419 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) |
420 | { | |
90602c7b EB |
421 | uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); |
422 | memcpy(gss_msg->databuf, &uid, sizeof(uid)); | |
423 | gss_msg->msg.data = gss_msg->databuf; | |
424 | gss_msg->msg.len = sizeof(uid); | |
9d3a2260 TM |
425 | |
426 | BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf)); | |
34769fc4 BF |
427 | } |
428 | ||
9d3a2260 | 429 | static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
bd4a3eb1 TM |
430 | const char *service_name, |
431 | const char *target_name) | |
34769fc4 | 432 | { |
683ac665 | 433 | struct gss_api_mech *mech = gss_msg->auth->mech; |
8b1c7bf5 | 434 | char *p = gss_msg->databuf; |
9d3a2260 TM |
435 | size_t buflen = sizeof(gss_msg->databuf); |
436 | int len; | |
437 | ||
438 | len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name, | |
439 | from_kuid(&init_user_ns, gss_msg->uid)); | |
440 | buflen -= len; | |
441 | p += len; | |
442 | gss_msg->msg.len = len; | |
bd4a3eb1 | 443 | if (target_name) { |
9d3a2260 TM |
444 | len = scnprintf(p, buflen, "target=%s ", target_name); |
445 | buflen -= len; | |
8b1c7bf5 OK |
446 | p += len; |
447 | gss_msg->msg.len += len; | |
448 | } | |
68c97153 | 449 | if (service_name != NULL) { |
9d3a2260 TM |
450 | len = scnprintf(p, buflen, "service=%s ", service_name); |
451 | buflen -= len; | |
2efef708 OK |
452 | p += len; |
453 | gss_msg->msg.len += len; | |
454 | } | |
683ac665 | 455 | if (mech->gm_upcall_enctypes) { |
9d3a2260 TM |
456 | len = scnprintf(p, buflen, "enctypes=%s ", |
457 | mech->gm_upcall_enctypes); | |
458 | buflen -= len; | |
683ac665 TM |
459 | p += len; |
460 | gss_msg->msg.len += len; | |
461 | } | |
9d3a2260 TM |
462 | len = scnprintf(p, buflen, "\n"); |
463 | if (len == 0) | |
464 | goto out_overflow; | |
8b1c7bf5 OK |
465 | gss_msg->msg.len += len; |
466 | ||
34769fc4 | 467 | gss_msg->msg.data = gss_msg->databuf; |
9d3a2260 TM |
468 | return 0; |
469 | out_overflow: | |
470 | WARN_ON_ONCE(1); | |
471 | return -ENOMEM; | |
34769fc4 BF |
472 | } |
473 | ||
68c97153 | 474 | static struct gss_upcall_msg * |
e726340a | 475 | gss_alloc_msg(struct gss_auth *gss_auth, |
7eaf040b | 476 | kuid_t uid, const char *service_name) |
1da177e4 LT |
477 | { |
478 | struct gss_upcall_msg *gss_msg; | |
79a3f20b | 479 | int vers; |
9d3a2260 | 480 | int err = -ENOMEM; |
1da177e4 | 481 | |
0f38b873 | 482 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
db75b3d6 | 483 | if (gss_msg == NULL) |
9d3a2260 | 484 | goto err; |
e726340a | 485 | vers = get_pipe_version(gss_auth->net); |
9d3a2260 TM |
486 | err = vers; |
487 | if (err < 0) | |
488 | goto err_free_msg; | |
19172284 | 489 | gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe; |
db75b3d6 BF |
490 | INIT_LIST_HEAD(&gss_msg->list); |
491 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
492 | init_waitqueue_head(&gss_msg->waitqueue); | |
493 | atomic_set(&gss_msg->count, 1); | |
db75b3d6 BF |
494 | gss_msg->uid = uid; |
495 | gss_msg->auth = gss_auth; | |
bd4a3eb1 TM |
496 | switch (vers) { |
497 | case 0: | |
498 | gss_encode_v0_msg(gss_msg); | |
5fccc5b5 | 499 | break; |
bd4a3eb1 | 500 | default: |
9d3a2260 TM |
501 | err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name); |
502 | if (err) | |
e9776d0f | 503 | goto err_put_pipe_version; |
bd4a3eb1 | 504 | }; |
9eb2ddb4 | 505 | kref_get(&gss_auth->kref); |
1da177e4 | 506 | return gss_msg; |
e9776d0f TM |
507 | err_put_pipe_version: |
508 | put_pipe_version(gss_auth->net); | |
9d3a2260 TM |
509 | err_free_msg: |
510 | kfree(gss_msg); | |
511 | err: | |
512 | return ERR_PTR(err); | |
1da177e4 LT |
513 | } |
514 | ||
515 | static struct gss_upcall_msg * | |
e726340a | 516 | gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred) |
1da177e4 | 517 | { |
7c67db3a TM |
518 | struct gss_cred *gss_cred = container_of(cred, |
519 | struct gss_cred, gc_base); | |
1da177e4 | 520 | struct gss_upcall_msg *gss_new, *gss_msg; |
7eaf040b | 521 | kuid_t uid = cred->cr_uid; |
1da177e4 | 522 | |
e726340a | 523 | gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal); |
db75b3d6 BF |
524 | if (IS_ERR(gss_new)) |
525 | return gss_new; | |
053e324f | 526 | gss_msg = gss_add_msg(gss_new); |
1da177e4 | 527 | if (gss_msg == gss_new) { |
9beae467 | 528 | int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); |
1da177e4 LT |
529 | if (res) { |
530 | gss_unhash_msg(gss_new); | |
531 | gss_msg = ERR_PTR(res); | |
532 | } | |
533 | } else | |
534 | gss_release_msg(gss_new); | |
535 | return gss_msg; | |
536 | } | |
537 | ||
b03568c3 BF |
538 | static void warn_gssd(void) |
539 | { | |
0ea9de0e | 540 | dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n"); |
b03568c3 BF |
541 | } |
542 | ||
1da177e4 LT |
543 | static inline int |
544 | gss_refresh_upcall(struct rpc_task *task) | |
545 | { | |
a17c2153 | 546 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
4a8c1344 | 547 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
548 | struct gss_auth, rpc_auth); |
549 | struct gss_cred *gss_cred = container_of(cred, | |
550 | struct gss_cred, gc_base); | |
551 | struct gss_upcall_msg *gss_msg; | |
9beae467 | 552 | struct rpc_pipe *pipe; |
1da177e4 LT |
553 | int err = 0; |
554 | ||
632f0d05 | 555 | dprintk("RPC: %5u %s for uid %u\n", |
cdba321e | 556 | task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid)); |
e726340a | 557 | gss_msg = gss_setup_upcall(gss_auth, cred); |
480e3243 | 558 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
79a3f20b BF |
559 | /* XXX: warning on the first, under the assumption we |
560 | * shouldn't normally hit this case on a refresh. */ | |
561 | warn_gssd(); | |
562 | task->tk_timeout = 15*HZ; | |
563 | rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); | |
d1a8016a | 564 | return -EAGAIN; |
79a3f20b | 565 | } |
1da177e4 LT |
566 | if (IS_ERR(gss_msg)) { |
567 | err = PTR_ERR(gss_msg); | |
568 | goto out; | |
569 | } | |
9beae467 SK |
570 | pipe = gss_msg->pipe; |
571 | spin_lock(&pipe->lock); | |
1da177e4 | 572 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 573 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
126e216a | 574 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
1da177e4 LT |
575 | task->tk_timeout = 0; |
576 | gss_cred->gc_upcall = gss_msg; | |
577 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
578 | atomic_inc(&gss_msg->count); | |
5d00837b | 579 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
126e216a TM |
580 | } else { |
581 | gss_handle_downcall_result(gss_cred, gss_msg); | |
1da177e4 | 582 | err = gss_msg->msg.errno; |
126e216a | 583 | } |
9beae467 | 584 | spin_unlock(&pipe->lock); |
1da177e4 LT |
585 | gss_release_msg(gss_msg); |
586 | out: | |
632f0d05 | 587 | dprintk("RPC: %5u %s for uid %u result %d\n", |
cdba321e EB |
588 | task->tk_pid, __func__, |
589 | from_kuid(&init_user_ns, cred->cr_uid), err); | |
1da177e4 LT |
590 | return err; |
591 | } | |
592 | ||
593 | static inline int | |
594 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
595 | { | |
e726340a | 596 | struct net *net = gss_auth->net; |
abfdbd53 | 597 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
9beae467 | 598 | struct rpc_pipe *pipe; |
1da177e4 LT |
599 | struct rpc_cred *cred = &gss_cred->gc_base; |
600 | struct gss_upcall_msg *gss_msg; | |
601 | DEFINE_WAIT(wait); | |
d36ccb9c | 602 | int err; |
1da177e4 | 603 | |
cdba321e EB |
604 | dprintk("RPC: %s for uid %u\n", |
605 | __func__, from_kuid(&init_user_ns, cred->cr_uid)); | |
79a3f20b | 606 | retry: |
d36ccb9c | 607 | err = 0; |
89f84243 JL |
608 | /* if gssd is down, just skip upcalling altogether */ |
609 | if (!gssd_running(net)) { | |
610 | warn_gssd(); | |
611 | return -EACCES; | |
612 | } | |
e726340a | 613 | gss_msg = gss_setup_upcall(gss_auth, cred); |
79a3f20b BF |
614 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
615 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, | |
89f84243 | 616 | sn->pipe_version >= 0, 15 * HZ); |
2aed8b47 | 617 | if (sn->pipe_version < 0) { |
d1a8016a BS |
618 | warn_gssd(); |
619 | err = -EACCES; | |
620 | } | |
d36ccb9c | 621 | if (err < 0) |
79a3f20b | 622 | goto out; |
79a3f20b BF |
623 | goto retry; |
624 | } | |
1da177e4 LT |
625 | if (IS_ERR(gss_msg)) { |
626 | err = PTR_ERR(gss_msg); | |
627 | goto out; | |
628 | } | |
9beae467 | 629 | pipe = gss_msg->pipe; |
1da177e4 | 630 | for (;;) { |
5afa9133 | 631 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); |
9beae467 | 632 | spin_lock(&pipe->lock); |
1da177e4 | 633 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
634 | break; |
635 | } | |
9beae467 | 636 | spin_unlock(&pipe->lock); |
5afa9133 | 637 | if (fatal_signal_pending(current)) { |
1da177e4 LT |
638 | err = -ERESTARTSYS; |
639 | goto out_intr; | |
640 | } | |
641 | schedule(); | |
642 | } | |
643 | if (gss_msg->ctx) | |
7b6962b0 | 644 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
645 | else |
646 | err = gss_msg->msg.errno; | |
9beae467 | 647 | spin_unlock(&pipe->lock); |
1da177e4 LT |
648 | out_intr: |
649 | finish_wait(&gss_msg->waitqueue, &wait); | |
650 | gss_release_msg(gss_msg); | |
651 | out: | |
632f0d05 | 652 | dprintk("RPC: %s for uid %u result %d\n", |
cdba321e | 653 | __func__, from_kuid(&init_user_ns, cred->cr_uid), err); |
1da177e4 LT |
654 | return err; |
655 | } | |
656 | ||
1da177e4 LT |
657 | #define MSG_BUF_MAXSIZE 1024 |
658 | ||
659 | static ssize_t | |
660 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
661 | { | |
662 | const void *p, *end; | |
663 | void *buf; | |
1da177e4 | 664 | struct gss_upcall_msg *gss_msg; |
496ad9aa | 665 | struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; |
1da177e4 | 666 | struct gss_cl_ctx *ctx; |
90602c7b EB |
667 | uid_t id; |
668 | kuid_t uid; | |
3b68aaea | 669 | ssize_t err = -EFBIG; |
1da177e4 LT |
670 | |
671 | if (mlen > MSG_BUF_MAXSIZE) | |
672 | goto out; | |
673 | err = -ENOMEM; | |
0f38b873 | 674 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
675 | if (!buf) |
676 | goto out; | |
677 | ||
1da177e4 LT |
678 | err = -EFAULT; |
679 | if (copy_from_user(buf, src, mlen)) | |
680 | goto err; | |
681 | ||
682 | end = (const void *)((char *)buf + mlen); | |
90602c7b | 683 | p = simple_get_bytes(buf, end, &id, sizeof(id)); |
1da177e4 LT |
684 | if (IS_ERR(p)) { |
685 | err = PTR_ERR(p); | |
686 | goto err; | |
687 | } | |
688 | ||
90602c7b EB |
689 | uid = make_kuid(&init_user_ns, id); |
690 | if (!uid_valid(uid)) { | |
691 | err = -EINVAL; | |
692 | goto err; | |
693 | } | |
694 | ||
1da177e4 LT |
695 | err = -ENOMEM; |
696 | ctx = gss_alloc_context(); | |
697 | if (ctx == NULL) | |
698 | goto err; | |
3b68aaea TM |
699 | |
700 | err = -ENOENT; | |
701 | /* Find a matching upcall */ | |
9beae467 SK |
702 | spin_lock(&pipe->lock); |
703 | gss_msg = __gss_find_upcall(pipe, uid); | |
3b68aaea | 704 | if (gss_msg == NULL) { |
9beae467 | 705 | spin_unlock(&pipe->lock); |
3b68aaea TM |
706 | goto err_put_ctx; |
707 | } | |
708 | list_del_init(&gss_msg->list); | |
9beae467 | 709 | spin_unlock(&pipe->lock); |
3b68aaea | 710 | |
6e84c7b6 | 711 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
712 | if (IS_ERR(p)) { |
713 | err = PTR_ERR(p); | |
486bad2e JL |
714 | switch (err) { |
715 | case -EACCES: | |
dc5ddce9 | 716 | case -EKEYEXPIRED: |
486bad2e JL |
717 | gss_msg->msg.errno = err; |
718 | err = mlen; | |
719 | break; | |
720 | case -EFAULT: | |
721 | case -ENOMEM: | |
722 | case -EINVAL: | |
723 | case -ENOSYS: | |
724 | gss_msg->msg.errno = -EAGAIN; | |
725 | break; | |
726 | default: | |
727 | printk(KERN_CRIT "%s: bad return from " | |
6c853099 | 728 | "gss_fill_context: %zd\n", __func__, err); |
486bad2e JL |
729 | BUG(); |
730 | } | |
3b68aaea | 731 | goto err_release_msg; |
1da177e4 | 732 | } |
3b68aaea TM |
733 | gss_msg->ctx = gss_get_ctx(ctx); |
734 | err = mlen; | |
735 | ||
736 | err_release_msg: | |
9beae467 | 737 | spin_lock(&pipe->lock); |
3b68aaea | 738 | __gss_unhash_msg(gss_msg); |
9beae467 | 739 | spin_unlock(&pipe->lock); |
3b68aaea | 740 | gss_release_msg(gss_msg); |
1da177e4 LT |
741 | err_put_ctx: |
742 | gss_put_ctx(ctx); | |
743 | err: | |
744 | kfree(buf); | |
745 | out: | |
632f0d05 | 746 | dprintk("RPC: %s returning %Zd\n", __func__, err); |
1da177e4 LT |
747 | return err; |
748 | } | |
749 | ||
34769fc4 | 750 | static int gss_pipe_open(struct inode *inode, int new_version) |
cf81939d | 751 | { |
2aed8b47 TM |
752 | struct net *net = inode->i_sb->s_fs_info; |
753 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
34769fc4 BF |
754 | int ret = 0; |
755 | ||
79a3f20b | 756 | spin_lock(&pipe_version_lock); |
2aed8b47 | 757 | if (sn->pipe_version < 0) { |
34769fc4 | 758 | /* First open of any gss pipe determines the version: */ |
2aed8b47 | 759 | sn->pipe_version = new_version; |
79a3f20b BF |
760 | rpc_wake_up(&pipe_version_rpc_waitqueue); |
761 | wake_up(&pipe_version_waitqueue); | |
2aed8b47 | 762 | } else if (sn->pipe_version != new_version) { |
34769fc4 BF |
763 | /* Trying to open a pipe of a different version */ |
764 | ret = -EBUSY; | |
765 | goto out; | |
79a3f20b | 766 | } |
2aed8b47 | 767 | atomic_inc(&sn->pipe_users); |
34769fc4 | 768 | out: |
79a3f20b | 769 | spin_unlock(&pipe_version_lock); |
34769fc4 BF |
770 | return ret; |
771 | ||
772 | } | |
773 | ||
774 | static int gss_pipe_open_v0(struct inode *inode) | |
775 | { | |
776 | return gss_pipe_open(inode, 0); | |
777 | } | |
778 | ||
779 | static int gss_pipe_open_v1(struct inode *inode) | |
780 | { | |
781 | return gss_pipe_open(inode, 1); | |
cf81939d BF |
782 | } |
783 | ||
1da177e4 LT |
784 | static void |
785 | gss_pipe_release(struct inode *inode) | |
786 | { | |
2aed8b47 | 787 | struct net *net = inode->i_sb->s_fs_info; |
9beae467 | 788 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
6e84c7b6 | 789 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 790 | |
5a67657a | 791 | restart: |
9beae467 SK |
792 | spin_lock(&pipe->lock); |
793 | list_for_each_entry(gss_msg, &pipe->in_downcall, list) { | |
1da177e4 | 794 | |
5a67657a TM |
795 | if (!list_empty(&gss_msg->msg.list)) |
796 | continue; | |
1da177e4 LT |
797 | gss_msg->msg.errno = -EPIPE; |
798 | atomic_inc(&gss_msg->count); | |
799 | __gss_unhash_msg(gss_msg); | |
9beae467 | 800 | spin_unlock(&pipe->lock); |
1da177e4 | 801 | gss_release_msg(gss_msg); |
5a67657a | 802 | goto restart; |
1da177e4 | 803 | } |
9beae467 | 804 | spin_unlock(&pipe->lock); |
cf81939d | 805 | |
2aed8b47 | 806 | put_pipe_version(net); |
1da177e4 LT |
807 | } |
808 | ||
809 | static void | |
810 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
811 | { | |
812 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
1da177e4 LT |
813 | |
814 | if (msg->errno < 0) { | |
632f0d05 CL |
815 | dprintk("RPC: %s releasing msg %p\n", |
816 | __func__, gss_msg); | |
1da177e4 LT |
817 | atomic_inc(&gss_msg->count); |
818 | gss_unhash_msg(gss_msg); | |
b03568c3 BF |
819 | if (msg->errno == -ETIMEDOUT) |
820 | warn_gssd(); | |
1da177e4 LT |
821 | gss_release_msg(gss_msg); |
822 | } | |
823 | } | |
824 | ||
19172284 TM |
825 | static void gss_pipe_dentry_destroy(struct dentry *dir, |
826 | struct rpc_pipe_dir_object *pdo) | |
ccdc28f8 | 827 | { |
19172284 TM |
828 | struct gss_pipe *gss_pipe = pdo->pdo_data; |
829 | struct rpc_pipe *pipe = gss_pipe->pipe; | |
ccdc28f8 | 830 | |
19172284 TM |
831 | if (pipe->dentry != NULL) { |
832 | rpc_unlink(pipe->dentry); | |
833 | pipe->dentry = NULL; | |
6b2fddd3 | 834 | } |
ccdc28f8 SK |
835 | } |
836 | ||
19172284 TM |
837 | static int gss_pipe_dentry_create(struct dentry *dir, |
838 | struct rpc_pipe_dir_object *pdo) | |
ccdc28f8 | 839 | { |
19172284 | 840 | struct gss_pipe *p = pdo->pdo_data; |
6b2fddd3 | 841 | struct dentry *dentry; |
ccdc28f8 | 842 | |
19172284 TM |
843 | dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe); |
844 | if (IS_ERR(dentry)) | |
845 | return PTR_ERR(dentry); | |
846 | p->pipe->dentry = dentry; | |
847 | return 0; | |
848 | } | |
849 | ||
850 | static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = { | |
851 | .create = gss_pipe_dentry_create, | |
852 | .destroy = gss_pipe_dentry_destroy, | |
853 | }; | |
854 | ||
855 | static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt, | |
856 | const char *name, | |
857 | const struct rpc_pipe_ops *upcall_ops) | |
858 | { | |
19172284 TM |
859 | struct gss_pipe *p; |
860 | int err = -ENOMEM; | |
ccdc28f8 | 861 | |
19172284 TM |
862 | p = kmalloc(sizeof(*p), GFP_KERNEL); |
863 | if (p == NULL) | |
6b2fddd3 | 864 | goto err; |
19172284 TM |
865 | p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); |
866 | if (IS_ERR(p->pipe)) { | |
867 | err = PTR_ERR(p->pipe); | |
868 | goto err_free_gss_pipe; | |
6b2fddd3 | 869 | } |
19172284 TM |
870 | p->name = name; |
871 | p->clnt = clnt; | |
414a6295 | 872 | kref_init(&p->kref); |
19172284 TM |
873 | rpc_init_pipe_dir_object(&p->pdo, |
874 | &gss_pipe_dir_object_ops, | |
875 | p); | |
414a6295 | 876 | return p; |
19172284 TM |
877 | err_free_gss_pipe: |
878 | kfree(p); | |
6b2fddd3 | 879 | err: |
19172284 | 880 | return ERR_PTR(err); |
ccdc28f8 SK |
881 | } |
882 | ||
414a6295 TM |
883 | struct gss_alloc_pdo { |
884 | struct rpc_clnt *clnt; | |
885 | const char *name; | |
886 | const struct rpc_pipe_ops *upcall_ops; | |
887 | }; | |
888 | ||
889 | static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data) | |
890 | { | |
891 | struct gss_pipe *gss_pipe; | |
892 | struct gss_alloc_pdo *args = data; | |
893 | ||
894 | if (pdo->pdo_ops != &gss_pipe_dir_object_ops) | |
895 | return 0; | |
896 | gss_pipe = container_of(pdo, struct gss_pipe, pdo); | |
897 | if (strcmp(gss_pipe->name, args->name) != 0) | |
898 | return 0; | |
899 | if (!kref_get_unless_zero(&gss_pipe->kref)) | |
900 | return 0; | |
901 | return 1; | |
902 | } | |
903 | ||
904 | static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data) | |
905 | { | |
906 | struct gss_pipe *gss_pipe; | |
907 | struct gss_alloc_pdo *args = data; | |
908 | ||
909 | gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops); | |
910 | if (!IS_ERR(gss_pipe)) | |
911 | return &gss_pipe->pdo; | |
912 | return NULL; | |
913 | } | |
914 | ||
915 | static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt, | |
916 | const char *name, | |
917 | const struct rpc_pipe_ops *upcall_ops) | |
918 | { | |
919 | struct net *net = rpc_net_ns(clnt); | |
920 | struct rpc_pipe_dir_object *pdo; | |
921 | struct gss_alloc_pdo args = { | |
922 | .clnt = clnt, | |
923 | .name = name, | |
924 | .upcall_ops = upcall_ops, | |
925 | }; | |
926 | ||
927 | pdo = rpc_find_or_alloc_pipe_dir_object(net, | |
928 | &clnt->cl_pipedir_objects, | |
929 | gss_pipe_match_pdo, | |
930 | gss_pipe_alloc_pdo, | |
931 | &args); | |
932 | if (pdo != NULL) | |
933 | return container_of(pdo, struct gss_pipe, pdo); | |
934 | return ERR_PTR(-ENOMEM); | |
935 | } | |
936 | ||
19172284 | 937 | static void __gss_pipe_free(struct gss_pipe *p) |
ccdc28f8 | 938 | { |
19172284 TM |
939 | struct rpc_clnt *clnt = p->clnt; |
940 | struct net *net = rpc_net_ns(clnt); | |
ccdc28f8 | 941 | |
19172284 TM |
942 | rpc_remove_pipe_dir_object(net, |
943 | &clnt->cl_pipedir_objects, | |
944 | &p->pdo); | |
945 | rpc_destroy_pipe_data(p->pipe); | |
946 | kfree(p); | |
ccdc28f8 SK |
947 | } |
948 | ||
414a6295 TM |
949 | static void __gss_pipe_release(struct kref *kref) |
950 | { | |
951 | struct gss_pipe *p = container_of(kref, struct gss_pipe, kref); | |
952 | ||
953 | __gss_pipe_free(p); | |
954 | } | |
955 | ||
19172284 | 956 | static void gss_pipe_free(struct gss_pipe *p) |
ccdc28f8 | 957 | { |
19172284 | 958 | if (p != NULL) |
414a6295 | 959 | kref_put(&p->kref, __gss_pipe_release); |
ccdc28f8 SK |
960 | } |
961 | ||
cca5172a YH |
962 | /* |
963 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
964 | * parameters based on the input flavor (which must be a pseudoflavor) |
965 | */ | |
eb6dc19d TM |
966 | static struct gss_auth * |
967 | gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) | |
1da177e4 | 968 | { |
c2190661 | 969 | rpc_authflavor_t flavor = args->pseudoflavor; |
1da177e4 | 970 | struct gss_auth *gss_auth; |
19172284 | 971 | struct gss_pipe *gss_pipe; |
1da177e4 | 972 | struct rpc_auth * auth; |
6a19275a | 973 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 974 | |
8885cb36 | 975 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
976 | |
977 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 978 | return ERR_PTR(err); |
1da177e4 LT |
979 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
980 | goto out_dec; | |
eb6dc19d | 981 | INIT_HLIST_NODE(&gss_auth->hash); |
bd4a3eb1 | 982 | gss_auth->target_name = NULL; |
c2190661 TM |
983 | if (args->target_name) { |
984 | gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL); | |
bd4a3eb1 TM |
985 | if (gss_auth->target_name == NULL) |
986 | goto err_free; | |
987 | } | |
1da177e4 | 988 | gss_auth->client = clnt; |
e726340a | 989 | gss_auth->net = get_net(rpc_net_ns(clnt)); |
6a19275a | 990 | err = -EINVAL; |
1da177e4 LT |
991 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
992 | if (!gss_auth->mech) { | |
9b1d75b7 | 993 | dprintk("RPC: Pseudoflavor %d not found!\n", flavor); |
e726340a | 994 | goto err_put_net; |
1da177e4 LT |
995 | } |
996 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
997 | if (gss_auth->service == 0) |
998 | goto err_put_mech; | |
a699d65e TM |
999 | if (!gssd_running(gss_auth->net)) |
1000 | goto err_put_mech; | |
1da177e4 LT |
1001 | auth = &gss_auth->rpc_auth; |
1002 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
1003 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
1004 | auth->au_ops = &authgss_ops; | |
1005 | auth->au_flavor = flavor; | |
1006 | atomic_set(&auth->au_count, 1); | |
0285ed1f | 1007 | kref_init(&gss_auth->kref); |
1da177e4 | 1008 | |
19172284 TM |
1009 | err = rpcauth_init_credcache(auth); |
1010 | if (err) | |
1011 | goto err_put_mech; | |
34769fc4 BF |
1012 | /* |
1013 | * Note: if we created the old pipe first, then someone who | |
1014 | * examined the directory at the right moment might conclude | |
1015 | * that we supported only the old pipe. So we instead create | |
1016 | * the new pipe first. | |
1017 | */ | |
414a6295 | 1018 | gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1); |
19172284 TM |
1019 | if (IS_ERR(gss_pipe)) { |
1020 | err = PTR_ERR(gss_pipe); | |
1021 | goto err_destroy_credcache; | |
6a19275a | 1022 | } |
19172284 | 1023 | gss_auth->gss_pipe[1] = gss_pipe; |
1da177e4 | 1024 | |
414a6295 | 1025 | gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name, |
19172284 TM |
1026 | &gss_upcall_ops_v0); |
1027 | if (IS_ERR(gss_pipe)) { | |
1028 | err = PTR_ERR(gss_pipe); | |
c239d83b SK |
1029 | goto err_destroy_pipe_1; |
1030 | } | |
19172284 | 1031 | gss_auth->gss_pipe[0] = gss_pipe; |
07a2bf1d | 1032 | |
eb6dc19d | 1033 | return gss_auth; |
c239d83b | 1034 | err_destroy_pipe_1: |
414a6295 | 1035 | gss_pipe_free(gss_auth->gss_pipe[1]); |
19172284 TM |
1036 | err_destroy_credcache: |
1037 | rpcauth_destroy_credcache(auth); | |
1da177e4 LT |
1038 | err_put_mech: |
1039 | gss_mech_put(gss_auth->mech); | |
e726340a TM |
1040 | err_put_net: |
1041 | put_net(gss_auth->net); | |
1da177e4 | 1042 | err_free: |
bd4a3eb1 | 1043 | kfree(gss_auth->target_name); |
1da177e4 LT |
1044 | kfree(gss_auth); |
1045 | out_dec: | |
1046 | module_put(THIS_MODULE); | |
6a19275a | 1047 | return ERR_PTR(err); |
1da177e4 LT |
1048 | } |
1049 | ||
0285ed1f TM |
1050 | static void |
1051 | gss_free(struct gss_auth *gss_auth) | |
1052 | { | |
19172284 TM |
1053 | gss_pipe_free(gss_auth->gss_pipe[0]); |
1054 | gss_pipe_free(gss_auth->gss_pipe[1]); | |
0285ed1f | 1055 | gss_mech_put(gss_auth->mech); |
e726340a | 1056 | put_net(gss_auth->net); |
bd4a3eb1 | 1057 | kfree(gss_auth->target_name); |
0285ed1f TM |
1058 | |
1059 | kfree(gss_auth); | |
1060 | module_put(THIS_MODULE); | |
1061 | } | |
1062 | ||
1063 | static void | |
1064 | gss_free_callback(struct kref *kref) | |
1065 | { | |
1066 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
1067 | ||
1068 | gss_free(gss_auth); | |
1069 | } | |
1070 | ||
9eb2ddb4 TM |
1071 | static void |
1072 | gss_put_auth(struct gss_auth *gss_auth) | |
1073 | { | |
1074 | kref_put(&gss_auth->kref, gss_free_callback); | |
1075 | } | |
1076 | ||
1da177e4 LT |
1077 | static void |
1078 | gss_destroy(struct rpc_auth *auth) | |
1079 | { | |
19172284 TM |
1080 | struct gss_auth *gss_auth = container_of(auth, |
1081 | struct gss_auth, rpc_auth); | |
1da177e4 | 1082 | |
8885cb36 CL |
1083 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
1084 | auth, auth->au_flavor); | |
1da177e4 | 1085 | |
eb6dc19d TM |
1086 | if (hash_hashed(&gss_auth->hash)) { |
1087 | spin_lock(&gss_auth_hash_lock); | |
1088 | hash_del(&gss_auth->hash); | |
1089 | spin_unlock(&gss_auth_hash_lock); | |
1090 | } | |
1091 | ||
19172284 TM |
1092 | gss_pipe_free(gss_auth->gss_pipe[0]); |
1093 | gss_auth->gss_pipe[0] = NULL; | |
1094 | gss_pipe_free(gss_auth->gss_pipe[1]); | |
1095 | gss_auth->gss_pipe[1] = NULL; | |
3ab9bb72 TM |
1096 | rpcauth_destroy_credcache(auth); |
1097 | ||
9eb2ddb4 | 1098 | gss_put_auth(gss_auth); |
1da177e4 LT |
1099 | } |
1100 | ||
a0f6ed8e BF |
1101 | /* |
1102 | * Auths may be shared between rpc clients that were cloned from a | |
1103 | * common client with the same xprt, if they also share the flavor and | |
1104 | * target_name. | |
1105 | * | |
1106 | * The auth is looked up from the oldest parent sharing the same | |
1107 | * cl_xprt, and the auth itself references only that common parent | |
1108 | * (which is guaranteed to last as long as any of its descendants). | |
1109 | */ | |
eb6dc19d TM |
1110 | static struct gss_auth * |
1111 | gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args, | |
1112 | struct rpc_clnt *clnt, | |
1113 | struct gss_auth *new) | |
1114 | { | |
1115 | struct gss_auth *gss_auth; | |
1116 | unsigned long hashval = (unsigned long)clnt; | |
1117 | ||
1118 | spin_lock(&gss_auth_hash_lock); | |
1119 | hash_for_each_possible(gss_auth_hash_table, | |
1120 | gss_auth, | |
1121 | hash, | |
1122 | hashval) { | |
a0f6ed8e BF |
1123 | if (gss_auth->client != clnt) |
1124 | continue; | |
eb6dc19d TM |
1125 | if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor) |
1126 | continue; | |
1127 | if (gss_auth->target_name != args->target_name) { | |
1128 | if (gss_auth->target_name == NULL) | |
1129 | continue; | |
1130 | if (args->target_name == NULL) | |
1131 | continue; | |
1132 | if (strcmp(gss_auth->target_name, args->target_name)) | |
1133 | continue; | |
1134 | } | |
1135 | if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count)) | |
1136 | continue; | |
1137 | goto out; | |
1138 | } | |
1139 | if (new) | |
1140 | hash_add(gss_auth_hash_table, &new->hash, hashval); | |
1141 | gss_auth = new; | |
1142 | out: | |
1143 | spin_unlock(&gss_auth_hash_lock); | |
1144 | return gss_auth; | |
1145 | } | |
1146 | ||
1147 | static struct gss_auth * | |
1148 | gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) | |
1149 | { | |
1150 | struct gss_auth *gss_auth; | |
1151 | struct gss_auth *new; | |
1152 | ||
1153 | gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL); | |
1154 | if (gss_auth != NULL) | |
1155 | goto out; | |
1156 | new = gss_create_new(args, clnt); | |
1157 | if (IS_ERR(new)) | |
1158 | return new; | |
1159 | gss_auth = gss_auth_find_or_add_hashed(args, clnt, new); | |
1160 | if (gss_auth != new) | |
1161 | gss_destroy(&new->rpc_auth); | |
1162 | out: | |
1163 | return gss_auth; | |
1164 | } | |
1165 | ||
1166 | static struct rpc_auth * | |
1167 | gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) | |
1168 | { | |
1169 | struct gss_auth *gss_auth; | |
1170 | struct rpc_xprt *xprt = rcu_access_pointer(clnt->cl_xprt); | |
1171 | ||
1172 | while (clnt != clnt->cl_parent) { | |
1173 | struct rpc_clnt *parent = clnt->cl_parent; | |
1174 | /* Find the original parent for this transport */ | |
1175 | if (rcu_access_pointer(parent->cl_xprt) != xprt) | |
1176 | break; | |
1177 | clnt = parent; | |
1178 | } | |
1179 | ||
1180 | gss_auth = gss_create_hashed(args, clnt); | |
1181 | if (IS_ERR(gss_auth)) | |
1182 | return ERR_CAST(gss_auth); | |
1183 | return &gss_auth->rpc_auth; | |
1184 | } | |
1185 | ||
0df7fb74 TM |
1186 | /* |
1187 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
1188 | * to the server with the GSS control procedure field set to | |
1189 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
1190 | * all RPCSEC_GSS state associated with that context. | |
1191 | */ | |
1192 | static int | |
1193 | gss_destroying_context(struct rpc_cred *cred) | |
1194 | { | |
1195 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1196 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
1197 | struct rpc_task *task; | |
1198 | ||
1199 | if (gss_cred->gc_ctx == NULL || | |
6dcd3926 | 1200 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
0df7fb74 TM |
1201 | return 0; |
1202 | ||
1203 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
1204 | cred->cr_ops = &gss_nullops; | |
1205 | ||
1206 | /* Take a reference to ensure the cred will be destroyed either | |
1207 | * by the RPC call or by the put_rpccred() below */ | |
1208 | get_rpccred(cred); | |
1209 | ||
080a1f14 | 1210 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
0df7fb74 TM |
1211 | if (!IS_ERR(task)) |
1212 | rpc_put_task(task); | |
1213 | ||
1214 | put_rpccred(cred); | |
1215 | return 1; | |
1216 | } | |
1217 | ||
1218 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
1219 | * to create a new cred or context, so they check that things have been |
1220 | * allocated before freeing them. */ | |
1221 | static void | |
5d28dc82 | 1222 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 1223 | { |
632f0d05 | 1224 | dprintk("RPC: %s\n", __func__); |
1da177e4 | 1225 | |
0d8a3746 | 1226 | gss_delete_sec_context(&ctx->gc_gss_ctx); |
1da177e4 LT |
1227 | kfree(ctx->gc_wire_ctx.data); |
1228 | kfree(ctx); | |
1229 | } | |
1230 | ||
5d28dc82 TM |
1231 | static void |
1232 | gss_free_ctx_callback(struct rcu_head *head) | |
1233 | { | |
1234 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
1235 | gss_do_free_ctx(ctx); | |
1236 | } | |
1237 | ||
1238 | static void | |
1239 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
1240 | { | |
1241 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); | |
1242 | } | |
1243 | ||
1da177e4 | 1244 | static void |
31be5bf1 | 1245 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 1246 | { |
632f0d05 | 1247 | dprintk("RPC: %s cred=%p\n", __func__, gss_cred); |
31be5bf1 TM |
1248 | kfree(gss_cred); |
1249 | } | |
1da177e4 | 1250 | |
31be5bf1 TM |
1251 | static void |
1252 | gss_free_cred_callback(struct rcu_head *head) | |
1253 | { | |
1254 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
1255 | gss_free_cred(gss_cred); | |
1256 | } | |
1da177e4 | 1257 | |
31be5bf1 | 1258 | static void |
6dcd3926 | 1259 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 1260 | { |
5d28dc82 | 1261 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 1262 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
5d28dc82 TM |
1263 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
1264 | ||
a9b3cd7f | 1265 | RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); |
31be5bf1 | 1266 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
1267 | if (ctx) |
1268 | gss_put_ctx(ctx); | |
9eb2ddb4 | 1269 | gss_put_auth(gss_auth); |
1da177e4 LT |
1270 | } |
1271 | ||
6dcd3926 JL |
1272 | static void |
1273 | gss_destroy_cred(struct rpc_cred *cred) | |
1274 | { | |
1275 | ||
1276 | if (gss_destroying_context(cred)) | |
1277 | return; | |
1278 | gss_destroy_nullcred(cred); | |
1279 | } | |
1280 | ||
1da177e4 LT |
1281 | /* |
1282 | * Lookup RPCSEC_GSS cred for the current process | |
1283 | */ | |
1284 | static struct rpc_cred * | |
8a317760 | 1285 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 1286 | { |
8a317760 | 1287 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
1288 | } |
1289 | ||
1290 | static struct rpc_cred * | |
8a317760 | 1291 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
1292 | { |
1293 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1294 | struct gss_cred *cred = NULL; | |
1295 | int err = -ENOMEM; | |
1296 | ||
632f0d05 | 1297 | dprintk("RPC: %s for uid %d, flavor %d\n", |
cdba321e EB |
1298 | __func__, from_kuid(&init_user_ns, acred->uid), |
1299 | auth->au_flavor); | |
1da177e4 | 1300 | |
0f38b873 | 1301 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
1da177e4 LT |
1302 | goto out_err; |
1303 | ||
5fe4755e | 1304 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
1305 | /* |
1306 | * Note: in order to force a call to call_refresh(), we deliberately | |
1307 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
1308 | */ | |
fc432dd9 | 1309 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 1310 | cred->gc_service = gss_auth->service; |
68c97153 TM |
1311 | cred->gc_principal = NULL; |
1312 | if (acred->machine_cred) | |
1313 | cred->gc_principal = acred->principal; | |
0285ed1f | 1314 | kref_get(&gss_auth->kref); |
1da177e4 LT |
1315 | return &cred->gc_base; |
1316 | ||
1317 | out_err: | |
632f0d05 | 1318 | dprintk("RPC: %s failed with error %d\n", __func__, err); |
1da177e4 LT |
1319 | return ERR_PTR(err); |
1320 | } | |
1321 | ||
fba3bad4 TM |
1322 | static int |
1323 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
1324 | { | |
1325 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1326 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
1327 | int err; | |
1328 | ||
1329 | do { | |
1330 | err = gss_create_upcall(gss_auth, gss_cred); | |
1331 | } while (err == -EAGAIN); | |
1332 | return err; | |
1333 | } | |
1334 | ||
4de6caa2 AA |
1335 | /* |
1336 | * Returns -EACCES if GSS context is NULL or will expire within the | |
1337 | * timeout (miliseconds) | |
1338 | */ | |
1339 | static int | |
1340 | gss_key_timeout(struct rpc_cred *rc) | |
1341 | { | |
1342 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
1343 | unsigned long now = jiffies; | |
1344 | unsigned long expire; | |
1345 | ||
1346 | if (gss_cred->gc_ctx == NULL) | |
1347 | return -EACCES; | |
1348 | ||
1349 | expire = gss_cred->gc_ctx->gc_expiry - (gss_key_expire_timeo * HZ); | |
1350 | ||
1351 | if (time_after(now, expire)) | |
1352 | return -EACCES; | |
1353 | return 0; | |
1354 | } | |
1355 | ||
1da177e4 | 1356 | static int |
8a317760 | 1357 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
1358 | { |
1359 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
4de6caa2 | 1360 | int ret; |
1da177e4 | 1361 | |
cd019f75 | 1362 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 1363 | goto out; |
1da177e4 | 1364 | /* Don't match with creds that have expired. */ |
cd019f75 TM |
1365 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
1366 | return 0; | |
1367 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1da177e4 | 1368 | return 0; |
8a317760 | 1369 | out: |
68c97153 TM |
1370 | if (acred->principal != NULL) { |
1371 | if (gss_cred->gc_principal == NULL) | |
1372 | return 0; | |
4de6caa2 AA |
1373 | ret = strcmp(acred->principal, gss_cred->gc_principal) == 0; |
1374 | goto check_expire; | |
68c97153 TM |
1375 | } |
1376 | if (gss_cred->gc_principal != NULL) | |
7c67db3a | 1377 | return 0; |
4de6caa2 AA |
1378 | ret = uid_eq(rc->cr_uid, acred->uid); |
1379 | ||
1380 | check_expire: | |
1381 | if (ret == 0) | |
1382 | return ret; | |
1383 | ||
1384 | /* Notify acred users of GSS context expiration timeout */ | |
1385 | if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) && | |
1386 | (gss_key_timeout(rc) != 0)) { | |
1387 | /* test will now be done from generic cred */ | |
1388 | test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags); | |
1389 | /* tell NFS layer that key will expire soon */ | |
1390 | set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags); | |
1391 | } | |
1392 | return ret; | |
1da177e4 LT |
1393 | } |
1394 | ||
1395 | /* | |
1396 | * Marshal credentials. | |
1397 | * Maybe we should keep a cached credential for performance reasons. | |
1398 | */ | |
d8ed029d AD |
1399 | static __be32 * |
1400 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1401 | { |
a17c2153 TM |
1402 | struct rpc_rqst *req = task->tk_rqstp; |
1403 | struct rpc_cred *cred = req->rq_cred; | |
1da177e4 LT |
1404 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1405 | gc_base); | |
1406 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1407 | __be32 *cred_len; |
1da177e4 LT |
1408 | u32 maj_stat = 0; |
1409 | struct xdr_netobj mic; | |
1410 | struct kvec iov; | |
1411 | struct xdr_buf verf_buf; | |
1412 | ||
632f0d05 | 1413 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1414 | |
1415 | *p++ = htonl(RPC_AUTH_GSS); | |
1416 | cred_len = p++; | |
1417 | ||
1418 | spin_lock(&ctx->gc_seq_lock); | |
1419 | req->rq_seqno = ctx->gc_seq++; | |
1420 | spin_unlock(&ctx->gc_seq_lock); | |
1421 | ||
1422 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
1423 | *p++ = htonl((u32) ctx->gc_proc); | |
1424 | *p++ = htonl((u32) req->rq_seqno); | |
1425 | *p++ = htonl((u32) gss_cred->gc_service); | |
1426 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
1427 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
1428 | ||
1429 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
1430 | * starting with the xid and ending at the end of the credential: */ | |
a4f0835c | 1431 | iov.iov_base = xprt_skip_transport_header(req->rq_xprt, |
808012fb | 1432 | req->rq_snd_buf.head[0].iov_base); |
1da177e4 LT |
1433 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
1434 | xdr_buf_from_iov(&iov, &verf_buf); | |
1435 | ||
1436 | /* set verifier flavor*/ | |
1437 | *p++ = htonl(RPC_AUTH_GSS); | |
1438 | ||
1439 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 1440 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1441 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 1442 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1443 | } else if (maj_stat != 0) { |
1444 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
1445 | goto out_put_ctx; | |
1446 | } | |
1447 | p = xdr_encode_opaque(p, NULL, mic.len); | |
1448 | gss_put_ctx(ctx); | |
1449 | return p; | |
1450 | out_put_ctx: | |
1451 | gss_put_ctx(ctx); | |
1452 | return NULL; | |
1453 | } | |
1454 | ||
cd019f75 TM |
1455 | static int gss_renew_cred(struct rpc_task *task) |
1456 | { | |
a17c2153 | 1457 | struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1458 | struct gss_cred *gss_cred = container_of(oldcred, |
1459 | struct gss_cred, | |
1460 | gc_base); | |
1461 | struct rpc_auth *auth = oldcred->cr_auth; | |
1462 | struct auth_cred acred = { | |
1463 | .uid = oldcred->cr_uid, | |
68c97153 TM |
1464 | .principal = gss_cred->gc_principal, |
1465 | .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), | |
cd019f75 TM |
1466 | }; |
1467 | struct rpc_cred *new; | |
1468 | ||
1469 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
1470 | if (IS_ERR(new)) | |
1471 | return PTR_ERR(new); | |
a17c2153 | 1472 | task->tk_rqstp->rq_cred = new; |
cd019f75 TM |
1473 | put_rpccred(oldcred); |
1474 | return 0; | |
1475 | } | |
1476 | ||
126e216a TM |
1477 | static int gss_cred_is_negative_entry(struct rpc_cred *cred) |
1478 | { | |
1479 | if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { | |
1480 | unsigned long now = jiffies; | |
1481 | unsigned long begin, expire; | |
1482 | struct gss_cred *gss_cred; | |
1483 | ||
1484 | gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1485 | begin = gss_cred->gc_upcall_timestamp; | |
1486 | expire = begin + gss_expired_cred_retry_delay * HZ; | |
1487 | ||
1488 | if (time_in_range_open(now, begin, expire)) | |
1489 | return 1; | |
1490 | } | |
1491 | return 0; | |
1492 | } | |
1493 | ||
1da177e4 LT |
1494 | /* |
1495 | * Refresh credentials. XXX - finish | |
1496 | */ | |
1497 | static int | |
1498 | gss_refresh(struct rpc_task *task) | |
1499 | { | |
a17c2153 | 1500 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1501 | int ret = 0; |
1502 | ||
126e216a TM |
1503 | if (gss_cred_is_negative_entry(cred)) |
1504 | return -EKEYEXPIRED; | |
1505 | ||
cd019f75 TM |
1506 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
1507 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
1508 | ret = gss_renew_cred(task); | |
1509 | if (ret < 0) | |
1510 | goto out; | |
a17c2153 | 1511 | cred = task->tk_rqstp->rq_cred; |
cd019f75 | 1512 | } |
1da177e4 | 1513 | |
cd019f75 TM |
1514 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
1515 | ret = gss_refresh_upcall(task); | |
1516 | out: | |
1517 | return ret; | |
1da177e4 LT |
1518 | } |
1519 | ||
0df7fb74 TM |
1520 | /* Dummy refresh routine: used only when destroying the context */ |
1521 | static int | |
1522 | gss_refresh_null(struct rpc_task *task) | |
1523 | { | |
c297c8b9 | 1524 | return 0; |
0df7fb74 TM |
1525 | } |
1526 | ||
d8ed029d AD |
1527 | static __be32 * |
1528 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1529 | { |
a17c2153 | 1530 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 | 1531 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 1532 | __be32 seq; |
1da177e4 LT |
1533 | struct kvec iov; |
1534 | struct xdr_buf verf_buf; | |
1535 | struct xdr_netobj mic; | |
1536 | u32 flav,len; | |
1537 | u32 maj_stat; | |
35fa5f7b | 1538 | __be32 *ret = ERR_PTR(-EIO); |
1da177e4 | 1539 | |
632f0d05 | 1540 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1541 | |
1542 | flav = ntohl(*p++); | |
1543 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 1544 | goto out_bad; |
1da177e4 LT |
1545 | if (flav != RPC_AUTH_GSS) |
1546 | goto out_bad; | |
1547 | seq = htonl(task->tk_rqstp->rq_seqno); | |
1548 | iov.iov_base = &seq; | |
1549 | iov.iov_len = sizeof(seq); | |
1550 | xdr_buf_from_iov(&iov, &verf_buf); | |
1551 | mic.data = (u8 *)p; | |
1552 | mic.len = len; | |
1553 | ||
35fa5f7b | 1554 | ret = ERR_PTR(-EACCES); |
00fd6e14 | 1555 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1556 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1557 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 1558 | if (maj_stat) { |
632f0d05 CL |
1559 | dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", |
1560 | task->tk_pid, __func__, maj_stat); | |
1da177e4 | 1561 | goto out_bad; |
0df7fb74 | 1562 | } |
24b2605b BF |
1563 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1564 | * calculate the length of the verifier: */ | |
1be27f36 | 1565 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 1566 | gss_put_ctx(ctx); |
632f0d05 CL |
1567 | dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", |
1568 | task->tk_pid, __func__); | |
1da177e4 LT |
1569 | return p + XDR_QUADLEN(len); |
1570 | out_bad: | |
1571 | gss_put_ctx(ctx); | |
35fa5f7b AA |
1572 | dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__, |
1573 | PTR_ERR(ret)); | |
1574 | return ret; | |
1da177e4 LT |
1575 | } |
1576 | ||
9f06c719 CL |
1577 | static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, |
1578 | __be32 *p, void *obj) | |
1579 | { | |
1580 | struct xdr_stream xdr; | |
1581 | ||
1582 | xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); | |
1583 | encode(rqstp, &xdr, obj); | |
1584 | } | |
1585 | ||
1da177e4 LT |
1586 | static inline int |
1587 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1588 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1589 | __be32 *p, void *obj) | |
1da177e4 LT |
1590 | { |
1591 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1592 | struct xdr_buf integ_buf; | |
d8ed029d | 1593 | __be32 *integ_len = NULL; |
1da177e4 | 1594 | struct xdr_netobj mic; |
d8ed029d AD |
1595 | u32 offset; |
1596 | __be32 *q; | |
1da177e4 LT |
1597 | struct kvec *iov; |
1598 | u32 maj_stat = 0; | |
1599 | int status = -EIO; | |
1600 | ||
1601 | integ_len = p++; | |
1602 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1603 | *p++ = htonl(rqstp->rq_seqno); | |
1604 | ||
9f06c719 | 1605 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1da177e4 LT |
1606 | |
1607 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1608 | offset, snd_buf->len - offset)) | |
1609 | return status; | |
1610 | *integ_len = htonl(integ_buf.len); | |
1611 | ||
1612 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1613 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1614 | iov = snd_buf->tail; |
1615 | else | |
1616 | iov = snd_buf->head; | |
1617 | p = iov->iov_base + iov->iov_len; | |
1618 | mic.data = (u8 *)(p + 1); | |
1619 | ||
00fd6e14 | 1620 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1621 | status = -EIO; /* XXX? */ |
1622 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1623 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1624 | else if (maj_stat) |
1625 | return status; | |
1626 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1627 | ||
1628 | offset = (u8 *)q - (u8 *)p; | |
1629 | iov->iov_len += offset; | |
1630 | snd_buf->len += offset; | |
1631 | return 0; | |
1632 | } | |
1633 | ||
2d2da60c BF |
1634 | static void |
1635 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1636 | { | |
1637 | int i; | |
1638 | ||
1639 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1640 | __free_page(rqstp->rq_enc_pages[i]); | |
1641 | kfree(rqstp->rq_enc_pages); | |
1642 | } | |
1643 | ||
1644 | static int | |
1645 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1646 | { | |
1647 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1648 | int first, last, i; | |
1649 | ||
1650 | if (snd_buf->page_len == 0) { | |
1651 | rqstp->rq_enc_pages_num = 0; | |
1652 | return 0; | |
1653 | } | |
1654 | ||
1655 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1656 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1657 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1658 | rqstp->rq_enc_pages | |
1659 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1660 | GFP_NOFS); | |
1661 | if (!rqstp->rq_enc_pages) | |
1662 | goto out; | |
1663 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1664 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1665 | if (rqstp->rq_enc_pages[i] == NULL) | |
1666 | goto out_free; | |
1667 | } | |
1668 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1669 | return 0; | |
1670 | out_free: | |
cdead7cf TM |
1671 | rqstp->rq_enc_pages_num = i; |
1672 | priv_release_snd_buf(rqstp); | |
2d2da60c BF |
1673 | out: |
1674 | return -EAGAIN; | |
1675 | } | |
1676 | ||
1677 | static inline int | |
1678 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1679 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1680 | __be32 *p, void *obj) | |
2d2da60c BF |
1681 | { |
1682 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1683 | u32 offset; | |
1684 | u32 maj_stat; | |
1685 | int status; | |
d8ed029d | 1686 | __be32 *opaque_len; |
2d2da60c BF |
1687 | struct page **inpages; |
1688 | int first; | |
1689 | int pad; | |
1690 | struct kvec *iov; | |
1691 | char *tmp; | |
1692 | ||
1693 | opaque_len = p++; | |
1694 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1695 | *p++ = htonl(rqstp->rq_seqno); | |
1696 | ||
9f06c719 | 1697 | gss_wrap_req_encode(encode, rqstp, p, obj); |
2d2da60c BF |
1698 | |
1699 | status = alloc_enc_pages(rqstp); | |
1700 | if (status) | |
1701 | return status; | |
1702 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1703 | inpages = snd_buf->pages + first; | |
1704 | snd_buf->pages = rqstp->rq_enc_pages; | |
1705 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
7561042f KC |
1706 | /* |
1707 | * Give the tail its own page, in case we need extra space in the | |
1708 | * head when wrapping: | |
1709 | * | |
1710 | * call_allocate() allocates twice the slack space required | |
1711 | * by the authentication flavor to rq_callsize. | |
1712 | * For GSS, slack is GSS_CRED_SLACK. | |
1713 | */ | |
2d2da60c BF |
1714 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
1715 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1716 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1717 | snd_buf->tail[0].iov_base = tmp; | |
1718 | } | |
00fd6e14 | 1719 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
7561042f | 1720 | /* slack space should prevent this ever happening: */ |
2d2da60c | 1721 | BUG_ON(snd_buf->len > snd_buf->buflen); |
cca5172a | 1722 | status = -EIO; |
2d2da60c BF |
1723 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1724 | * done anyway, so it's safe to put the request on the wire: */ | |
1725 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1726 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1727 | else if (maj_stat) |
1728 | return status; | |
1729 | ||
1730 | *opaque_len = htonl(snd_buf->len - offset); | |
1731 | /* guess whether we're in the head or the tail: */ | |
1732 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1733 | iov = snd_buf->tail; | |
1734 | else | |
1735 | iov = snd_buf->head; | |
1736 | p = iov->iov_base + iov->iov_len; | |
1737 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1738 | memset(p, 0, pad); | |
1739 | iov->iov_len += pad; | |
1740 | snd_buf->len += pad; | |
1741 | ||
1742 | return 0; | |
1743 | } | |
1744 | ||
1da177e4 LT |
1745 | static int |
1746 | gss_wrap_req(struct rpc_task *task, | |
9f06c719 | 1747 | kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1748 | { |
a17c2153 | 1749 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1750 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1751 | gc_base); | |
1752 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1753 | int status = -EIO; | |
1754 | ||
632f0d05 | 1755 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1756 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1757 | /* The spec seems a little ambiguous here, but I think that not | |
1758 | * wrapping context destruction requests makes the most sense. | |
1759 | */ | |
9f06c719 CL |
1760 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1761 | status = 0; | |
1da177e4 LT |
1762 | goto out; |
1763 | } | |
1764 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1765 | case RPC_GSS_SVC_NONE: |
1766 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1767 | status = 0; | |
1768 | break; | |
1769 | case RPC_GSS_SVC_INTEGRITY: | |
1770 | status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); | |
1771 | break; | |
1772 | case RPC_GSS_SVC_PRIVACY: | |
1773 | status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); | |
1774 | break; | |
1da177e4 LT |
1775 | } |
1776 | out: | |
1777 | gss_put_ctx(ctx); | |
632f0d05 | 1778 | dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); |
1da177e4 LT |
1779 | return status; |
1780 | } | |
1781 | ||
1782 | static inline int | |
1783 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1784 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1785 | { |
1786 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1787 | struct xdr_buf integ_buf; | |
1788 | struct xdr_netobj mic; | |
1789 | u32 data_offset, mic_offset; | |
1790 | u32 integ_len; | |
1791 | u32 maj_stat; | |
1792 | int status = -EIO; | |
1793 | ||
1794 | integ_len = ntohl(*(*p)++); | |
1795 | if (integ_len & 3) | |
1796 | return status; | |
1797 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1798 | mic_offset = integ_len + data_offset; | |
1799 | if (mic_offset > rcv_buf->len) | |
1800 | return status; | |
1801 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1802 | return status; | |
1803 | ||
1804 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1805 | mic_offset - data_offset)) | |
1806 | return status; | |
1807 | ||
1808 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1809 | return status; | |
1810 | ||
00fd6e14 | 1811 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1812 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1813 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1814 | if (maj_stat != GSS_S_COMPLETE) |
1815 | return status; | |
1816 | return 0; | |
1817 | } | |
1818 | ||
2d2da60c BF |
1819 | static inline int |
1820 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1821 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1822 | { |
1823 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1824 | u32 offset; | |
1825 | u32 opaque_len; | |
1826 | u32 maj_stat; | |
1827 | int status = -EIO; | |
1828 | ||
1829 | opaque_len = ntohl(*(*p)++); | |
1830 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1831 | if (offset + opaque_len > rcv_buf->len) | |
1832 | return status; | |
1833 | /* remove padding: */ | |
1834 | rcv_buf->len = offset + opaque_len; | |
1835 | ||
00fd6e14 | 1836 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1837 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1838 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1839 | if (maj_stat != GSS_S_COMPLETE) |
1840 | return status; | |
1841 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1842 | return status; | |
1843 | ||
1844 | return 0; | |
1845 | } | |
1846 | ||
bf269551 CL |
1847 | static int |
1848 | gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, | |
1849 | __be32 *p, void *obj) | |
1850 | { | |
1851 | struct xdr_stream xdr; | |
1852 | ||
1853 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
1854 | return decode(rqstp, &xdr, obj); | |
1855 | } | |
2d2da60c | 1856 | |
1da177e4 LT |
1857 | static int |
1858 | gss_unwrap_resp(struct rpc_task *task, | |
bf269551 | 1859 | kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1860 | { |
a17c2153 | 1861 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1862 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1863 | gc_base); | |
1864 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1865 | __be32 *savedp = p; |
2d2da60c BF |
1866 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1867 | int savedlen = head->iov_len; | |
1da177e4 LT |
1868 | int status = -EIO; |
1869 | ||
1870 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1871 | goto out_decode; | |
1872 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1873 | case RPC_GSS_SVC_NONE: |
1874 | break; | |
1875 | case RPC_GSS_SVC_INTEGRITY: | |
1876 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1877 | if (status) | |
1878 | goto out; | |
1879 | break; | |
1880 | case RPC_GSS_SVC_PRIVACY: | |
1881 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); | |
1882 | if (status) | |
1883 | goto out; | |
1884 | break; | |
1da177e4 | 1885 | } |
24b2605b | 1886 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 1887 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 1888 | + (savedlen - head->iov_len); |
1da177e4 | 1889 | out_decode: |
bf269551 | 1890 | status = gss_unwrap_req_decode(decode, rqstp, p, obj); |
1da177e4 LT |
1891 | out: |
1892 | gss_put_ctx(ctx); | |
632f0d05 CL |
1893 | dprintk("RPC: %5u %s returning %d\n", |
1894 | task->tk_pid, __func__, status); | |
1da177e4 LT |
1895 | return status; |
1896 | } | |
cca5172a | 1897 | |
f1c0a861 | 1898 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1899 | .owner = THIS_MODULE, |
1900 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 1901 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
1902 | .create = gss_create, |
1903 | .destroy = gss_destroy, | |
1904 | .lookup_cred = gss_lookup_cred, | |
80df9d20 | 1905 | .crcreate = gss_create_cred, |
6a1a1e34 | 1906 | .list_pseudoflavors = gss_mech_list_pseudoflavors, |
9568c5e9 | 1907 | .info2flavor = gss_mech_info2flavor, |
a77c806f | 1908 | .flavor2info = gss_mech_flavor2info, |
1da177e4 LT |
1909 | }; |
1910 | ||
f1c0a861 | 1911 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1912 | .cr_name = "AUTH_GSS", |
1913 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1914 | .cr_init = gss_cred_init, |
5c691044 | 1915 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
1916 | .crmatch = gss_match, |
1917 | .crmarshal = gss_marshal, | |
1918 | .crrefresh = gss_refresh, | |
1919 | .crvalidate = gss_validate, | |
1920 | .crwrap_req = gss_wrap_req, | |
1921 | .crunwrap_resp = gss_unwrap_resp, | |
4de6caa2 | 1922 | .crkey_timeout = gss_key_timeout, |
1da177e4 LT |
1923 | }; |
1924 | ||
0df7fb74 TM |
1925 | static const struct rpc_credops gss_nullops = { |
1926 | .cr_name = "AUTH_GSS", | |
6dcd3926 | 1927 | .crdestroy = gss_destroy_nullcred, |
5c691044 | 1928 | .crbind = rpcauth_generic_bind_cred, |
0df7fb74 TM |
1929 | .crmatch = gss_match, |
1930 | .crmarshal = gss_marshal, | |
1931 | .crrefresh = gss_refresh_null, | |
1932 | .crvalidate = gss_validate, | |
1933 | .crwrap_req = gss_wrap_req, | |
1934 | .crunwrap_resp = gss_unwrap_resp, | |
1935 | }; | |
1936 | ||
b693ba4a | 1937 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
c1225158 | 1938 | .upcall = rpc_pipe_generic_upcall, |
34769fc4 BF |
1939 | .downcall = gss_pipe_downcall, |
1940 | .destroy_msg = gss_pipe_destroy_msg, | |
1941 | .open_pipe = gss_pipe_open_v0, | |
1942 | .release_pipe = gss_pipe_release, | |
1943 | }; | |
1944 | ||
b693ba4a | 1945 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
c1225158 | 1946 | .upcall = rpc_pipe_generic_upcall, |
1da177e4 LT |
1947 | .downcall = gss_pipe_downcall, |
1948 | .destroy_msg = gss_pipe_destroy_msg, | |
34769fc4 | 1949 | .open_pipe = gss_pipe_open_v1, |
1da177e4 LT |
1950 | .release_pipe = gss_pipe_release, |
1951 | }; | |
1952 | ||
a1db410d SK |
1953 | static __net_init int rpcsec_gss_init_net(struct net *net) |
1954 | { | |
1955 | return gss_svc_init_net(net); | |
1956 | } | |
1957 | ||
1958 | static __net_exit void rpcsec_gss_exit_net(struct net *net) | |
1959 | { | |
1960 | gss_svc_shutdown_net(net); | |
1961 | } | |
1962 | ||
1963 | static struct pernet_operations rpcsec_gss_net_ops = { | |
1964 | .init = rpcsec_gss_init_net, | |
1965 | .exit = rpcsec_gss_exit_net, | |
1966 | }; | |
1967 | ||
1da177e4 LT |
1968 | /* |
1969 | * Initialize RPCSEC_GSS module | |
1970 | */ | |
1971 | static int __init init_rpcsec_gss(void) | |
1972 | { | |
1973 | int err = 0; | |
1974 | ||
1975 | err = rpcauth_register(&authgss_ops); | |
1976 | if (err) | |
1977 | goto out; | |
1978 | err = gss_svc_init(); | |
1979 | if (err) | |
1980 | goto out_unregister; | |
a1db410d SK |
1981 | err = register_pernet_subsys(&rpcsec_gss_net_ops); |
1982 | if (err) | |
1983 | goto out_svc_exit; | |
79a3f20b | 1984 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
1da177e4 | 1985 | return 0; |
a1db410d SK |
1986 | out_svc_exit: |
1987 | gss_svc_shutdown(); | |
1da177e4 LT |
1988 | out_unregister: |
1989 | rpcauth_unregister(&authgss_ops); | |
1990 | out: | |
1991 | return err; | |
1992 | } | |
1993 | ||
1994 | static void __exit exit_rpcsec_gss(void) | |
1995 | { | |
a1db410d | 1996 | unregister_pernet_subsys(&rpcsec_gss_net_ops); |
1da177e4 LT |
1997 | gss_svc_shutdown(); |
1998 | rpcauth_unregister(&authgss_ops); | |
bf12691d | 1999 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
2000 | } |
2001 | ||
71afa85e | 2002 | MODULE_ALIAS("rpc-auth-6"); |
1da177e4 | 2003 | MODULE_LICENSE("GPL"); |
126e216a TM |
2004 | module_param_named(expired_cred_retry_delay, |
2005 | gss_expired_cred_retry_delay, | |
2006 | uint, 0644); | |
2007 | MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " | |
2008 | "the RPC engine retries an expired credential"); | |
2009 | ||
4de6caa2 AA |
2010 | module_param_named(key_expire_timeo, |
2011 | gss_key_expire_timeo, | |
2012 | uint, 0644); | |
2013 | MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a " | |
2014 | "credential keys lifetime where the NFS layer cleans up " | |
2015 | "prior to key expiration"); | |
2016 | ||
1da177e4 LT |
2017 | module_init(init_rpcsec_gss) |
2018 | module_exit(exit_rpcsec_gss) |