Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/net/sunrpc/auth_gss/auth_gss.c |
1da177e4 LT |
3 | * |
4 | * RPCSEC_GSS client authentication. | |
cca5172a | 5 | * |
1da177e4 LT |
6 | * Copyright (c) 2000 The Regents of the University of Michigan. |
7 | * All rights reserved. | |
8 | * | |
9 | * Dug Song <dugsong@monkey.org> | |
10 | * Andy Adamson <andros@umich.edu> | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * | |
16 | * 1. Redistributions of source code must retain the above copyright | |
17 | * notice, this list of conditions and the following disclaimer. | |
18 | * 2. Redistributions in binary form must reproduce the above copyright | |
19 | * notice, this list of conditions and the following disclaimer in the | |
20 | * documentation and/or other materials provided with the distribution. | |
21 | * 3. Neither the name of the University nor the names of its | |
22 | * contributors may be used to endorse or promote products derived | |
23 | * from this software without specific prior written permission. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
26 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
27 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
28 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
32 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
33 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
34 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
35 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
1da177e4 LT |
36 | */ |
37 | ||
38 | ||
39 | #include <linux/module.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/types.h> | |
42 | #include <linux/slab.h> | |
1da177e4 | 43 | #include <linux/sched.h> |
2d2da60c | 44 | #include <linux/pagemap.h> |
1da177e4 LT |
45 | #include <linux/sunrpc/clnt.h> |
46 | #include <linux/sunrpc/auth.h> | |
47 | #include <linux/sunrpc/auth_gss.h> | |
48 | #include <linux/sunrpc/svcauth_gss.h> | |
49 | #include <linux/sunrpc/gss_err.h> | |
50 | #include <linux/workqueue.h> | |
51 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
52 | #include <linux/sunrpc/gss_api.h> | |
53 | #include <asm/uaccess.h> | |
54 | ||
abfdbd53 TM |
55 | #include "../netns.h" |
56 | ||
f1c0a861 | 57 | static const struct rpc_authops authgss_ops; |
1da177e4 | 58 | |
f1c0a861 | 59 | static const struct rpc_credops gss_credops; |
0df7fb74 | 60 | static const struct rpc_credops gss_nullops; |
1da177e4 | 61 | |
126e216a TM |
62 | #define GSS_RETRY_EXPIRED 5 |
63 | static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; | |
64 | ||
1da177e4 LT |
65 | #ifdef RPC_DEBUG |
66 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
67 | #endif | |
68 | ||
725f2865 | 69 | #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) |
1da177e4 LT |
70 | /* length of a krb5 verifier (48), plus data added before arguments when |
71 | * using integrity (two 4-byte integers): */ | |
adeb8133 | 72 | #define GSS_VERF_SLACK 100 |
1da177e4 | 73 | |
1da177e4 | 74 | struct gss_auth { |
0285ed1f | 75 | struct kref kref; |
1da177e4 LT |
76 | struct rpc_auth rpc_auth; |
77 | struct gss_api_mech *mech; | |
78 | enum rpc_gss_svc service; | |
1da177e4 | 79 | struct rpc_clnt *client; |
34769fc4 BF |
80 | /* |
81 | * There are two upcall pipes; dentry[1], named "gssd", is used | |
82 | * for the new text-based upcall; dentry[0] is named after the | |
83 | * mechanism (for example, "krb5") and exists for | |
84 | * backwards-compatibility with older gssd's. | |
85 | */ | |
c239d83b | 86 | struct rpc_pipe *pipe[2]; |
1da177e4 LT |
87 | }; |
88 | ||
79a3f20b BF |
89 | /* pipe_version >= 0 if and only if someone has a pipe open. */ |
90 | static int pipe_version = -1; | |
cf81939d | 91 | static atomic_t pipe_users = ATOMIC_INIT(0); |
79a3f20b BF |
92 | static DEFINE_SPINLOCK(pipe_version_lock); |
93 | static struct rpc_wait_queue pipe_version_rpc_waitqueue; | |
94 | static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); | |
cf81939d | 95 | |
5d28dc82 | 96 | static void gss_free_ctx(struct gss_cl_ctx *); |
b693ba4a TM |
97 | static const struct rpc_pipe_ops gss_upcall_ops_v0; |
98 | static const struct rpc_pipe_ops gss_upcall_ops_v1; | |
1da177e4 | 99 | |
1da177e4 LT |
100 | static inline struct gss_cl_ctx * |
101 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
102 | { | |
103 | atomic_inc(&ctx->count); | |
104 | return ctx; | |
105 | } | |
106 | ||
107 | static inline void | |
108 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
109 | { | |
110 | if (atomic_dec_and_test(&ctx->count)) | |
5d28dc82 | 111 | gss_free_ctx(ctx); |
1da177e4 LT |
112 | } |
113 | ||
5d28dc82 TM |
114 | /* gss_cred_set_ctx: |
115 | * called by gss_upcall_callback and gss_create_upcall in order | |
116 | * to set the gss context. The actual exchange of an old context | |
9beae467 | 117 | * and a new one is protected by the pipe->lock. |
5d28dc82 | 118 | */ |
1da177e4 LT |
119 | static void |
120 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
121 | { | |
122 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
5d28dc82 | 123 | |
cd019f75 TM |
124 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
125 | return; | |
7b6962b0 | 126 | gss_get_ctx(ctx); |
cf778b00 | 127 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 | 128 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
cd019f75 | 129 | smp_mb__before_clear_bit(); |
fc432dd9 | 130 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
1da177e4 LT |
131 | } |
132 | ||
133 | static const void * | |
134 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
135 | { | |
136 | const void *q = (const void *)((const char *)p + len); | |
137 | if (unlikely(q > end || q < p)) | |
138 | return ERR_PTR(-EFAULT); | |
139 | memcpy(res, p, len); | |
140 | return q; | |
141 | } | |
142 | ||
143 | static inline const void * | |
144 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
145 | { | |
146 | const void *q; | |
147 | unsigned int len; | |
148 | ||
149 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
150 | if (IS_ERR(p)) | |
151 | return p; | |
152 | q = (const void *)((const char *)p + len); | |
153 | if (unlikely(q > end || q < p)) | |
154 | return ERR_PTR(-EFAULT); | |
0f38b873 | 155 | dest->data = kmemdup(p, len, GFP_NOFS); |
1da177e4 LT |
156 | if (unlikely(dest->data == NULL)) |
157 | return ERR_PTR(-ENOMEM); | |
158 | dest->len = len; | |
1da177e4 LT |
159 | return q; |
160 | } | |
161 | ||
162 | static struct gss_cl_ctx * | |
163 | gss_cred_get_ctx(struct rpc_cred *cred) | |
164 | { | |
165 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
166 | struct gss_cl_ctx *ctx = NULL; | |
167 | ||
5d28dc82 | 168 | rcu_read_lock(); |
1da177e4 LT |
169 | if (gss_cred->gc_ctx) |
170 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
5d28dc82 | 171 | rcu_read_unlock(); |
1da177e4 LT |
172 | return ctx; |
173 | } | |
174 | ||
175 | static struct gss_cl_ctx * | |
176 | gss_alloc_context(void) | |
177 | { | |
178 | struct gss_cl_ctx *ctx; | |
179 | ||
0f38b873 | 180 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
1da177e4 | 181 | if (ctx != NULL) { |
1da177e4 LT |
182 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
183 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
184 | spin_lock_init(&ctx->gc_seq_lock); | |
185 | atomic_set(&ctx->count,1); | |
186 | } | |
187 | return ctx; | |
188 | } | |
189 | ||
190 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
191 | static const void * | |
192 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
193 | { | |
194 | const void *q; | |
195 | unsigned int seclen; | |
196 | unsigned int timeout; | |
620038f6 | 197 | unsigned long now = jiffies; |
1da177e4 LT |
198 | u32 window_size; |
199 | int ret; | |
200 | ||
620038f6 AA |
201 | /* First unsigned int gives the remaining lifetime in seconds of the |
202 | * credential - e.g. the remaining TGT lifetime for Kerberos or | |
203 | * the -t value passed to GSSD. | |
204 | */ | |
1da177e4 LT |
205 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); |
206 | if (IS_ERR(p)) | |
207 | goto err; | |
208 | if (timeout == 0) | |
209 | timeout = GSSD_MIN_TIMEOUT; | |
620038f6 AA |
210 | ctx->gc_expiry = now + ((unsigned long)timeout * HZ); |
211 | /* Sequence number window. Determines the maximum number of | |
212 | * simultaneous requests | |
213 | */ | |
1da177e4 LT |
214 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); |
215 | if (IS_ERR(p)) | |
216 | goto err; | |
217 | ctx->gc_win = window_size; | |
218 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
219 | if (ctx->gc_win == 0) { | |
dc5ddce9 JL |
220 | /* |
221 | * in which case, p points to an error code. Anything other | |
222 | * than -EKEYEXPIRED gets converted to -EACCES. | |
223 | */ | |
224 | p = simple_get_bytes(p, end, &ret, sizeof(ret)); | |
225 | if (!IS_ERR(p)) | |
226 | p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : | |
227 | ERR_PTR(-EACCES); | |
1da177e4 LT |
228 | goto err; |
229 | } | |
230 | /* copy the opaque wire context */ | |
231 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
232 | if (IS_ERR(p)) | |
233 | goto err; | |
234 | /* import the opaque security context */ | |
235 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
236 | if (IS_ERR(p)) | |
237 | goto err; | |
238 | q = (const void *)((const char *)p + seclen); | |
239 | if (unlikely(q > end || q < p)) { | |
240 | p = ERR_PTR(-EFAULT); | |
241 | goto err; | |
242 | } | |
400f26b5 | 243 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); |
1da177e4 LT |
244 | if (ret < 0) { |
245 | p = ERR_PTR(ret); | |
246 | goto err; | |
247 | } | |
620038f6 AA |
248 | dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u\n", |
249 | __func__, ctx->gc_expiry, now, timeout); | |
1da177e4 LT |
250 | return q; |
251 | err: | |
173db309 | 252 | dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); |
1da177e4 LT |
253 | return p; |
254 | } | |
255 | ||
34769fc4 | 256 | #define UPCALL_BUF_LEN 128 |
1da177e4 LT |
257 | |
258 | struct gss_upcall_msg { | |
259 | atomic_t count; | |
7eaf040b | 260 | kuid_t uid; |
1da177e4 LT |
261 | struct rpc_pipe_msg msg; |
262 | struct list_head list; | |
263 | struct gss_auth *auth; | |
9beae467 | 264 | struct rpc_pipe *pipe; |
1da177e4 LT |
265 | struct rpc_wait_queue rpc_waitqueue; |
266 | wait_queue_head_t waitqueue; | |
267 | struct gss_cl_ctx *ctx; | |
34769fc4 | 268 | char databuf[UPCALL_BUF_LEN]; |
1da177e4 LT |
269 | }; |
270 | ||
79a3f20b BF |
271 | static int get_pipe_version(void) |
272 | { | |
273 | int ret; | |
274 | ||
275 | spin_lock(&pipe_version_lock); | |
276 | if (pipe_version >= 0) { | |
277 | atomic_inc(&pipe_users); | |
34769fc4 | 278 | ret = pipe_version; |
79a3f20b BF |
279 | } else |
280 | ret = -EAGAIN; | |
281 | spin_unlock(&pipe_version_lock); | |
282 | return ret; | |
283 | } | |
284 | ||
285 | static void put_pipe_version(void) | |
286 | { | |
287 | if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) { | |
288 | pipe_version = -1; | |
289 | spin_unlock(&pipe_version_lock); | |
290 | } | |
291 | } | |
292 | ||
1da177e4 LT |
293 | static void |
294 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
295 | { | |
296 | if (!atomic_dec_and_test(&gss_msg->count)) | |
297 | return; | |
79a3f20b | 298 | put_pipe_version(); |
1da177e4 LT |
299 | BUG_ON(!list_empty(&gss_msg->list)); |
300 | if (gss_msg->ctx != NULL) | |
301 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 302 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
1da177e4 LT |
303 | kfree(gss_msg); |
304 | } | |
305 | ||
306 | static struct gss_upcall_msg * | |
7eaf040b | 307 | __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid) |
1da177e4 LT |
308 | { |
309 | struct gss_upcall_msg *pos; | |
9beae467 | 310 | list_for_each_entry(pos, &pipe->in_downcall, list) { |
0b4d51b0 | 311 | if (!uid_eq(pos->uid, uid)) |
1da177e4 LT |
312 | continue; |
313 | atomic_inc(&pos->count); | |
632f0d05 | 314 | dprintk("RPC: %s found msg %p\n", __func__, pos); |
1da177e4 LT |
315 | return pos; |
316 | } | |
632f0d05 | 317 | dprintk("RPC: %s found nothing\n", __func__); |
1da177e4 LT |
318 | return NULL; |
319 | } | |
320 | ||
720b8f2d | 321 | /* Try to add an upcall to the pipefs queue. |
1da177e4 LT |
322 | * If an upcall owned by our uid already exists, then we return a reference |
323 | * to that upcall instead of adding the new upcall. | |
324 | */ | |
325 | static inline struct gss_upcall_msg * | |
053e324f | 326 | gss_add_msg(struct gss_upcall_msg *gss_msg) |
1da177e4 | 327 | { |
9beae467 | 328 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 LT |
329 | struct gss_upcall_msg *old; |
330 | ||
9beae467 SK |
331 | spin_lock(&pipe->lock); |
332 | old = __gss_find_upcall(pipe, gss_msg->uid); | |
1da177e4 LT |
333 | if (old == NULL) { |
334 | atomic_inc(&gss_msg->count); | |
9beae467 | 335 | list_add(&gss_msg->list, &pipe->in_downcall); |
1da177e4 LT |
336 | } else |
337 | gss_msg = old; | |
9beae467 | 338 | spin_unlock(&pipe->lock); |
1da177e4 LT |
339 | return gss_msg; |
340 | } | |
341 | ||
342 | static void | |
343 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
344 | { | |
1da177e4 LT |
345 | list_del_init(&gss_msg->list); |
346 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
347 | wake_up_all(&gss_msg->waitqueue); | |
348 | atomic_dec(&gss_msg->count); | |
349 | } | |
350 | ||
351 | static void | |
352 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
353 | { | |
9beae467 | 354 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 355 | |
3b68aaea TM |
356 | if (list_empty(&gss_msg->list)) |
357 | return; | |
9beae467 | 358 | spin_lock(&pipe->lock); |
3b68aaea TM |
359 | if (!list_empty(&gss_msg->list)) |
360 | __gss_unhash_msg(gss_msg); | |
9beae467 | 361 | spin_unlock(&pipe->lock); |
1da177e4 LT |
362 | } |
363 | ||
126e216a TM |
364 | static void |
365 | gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) | |
366 | { | |
367 | switch (gss_msg->msg.errno) { | |
368 | case 0: | |
369 | if (gss_msg->ctx == NULL) | |
370 | break; | |
371 | clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
372 | gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); | |
373 | break; | |
374 | case -EKEYEXPIRED: | |
375 | set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
376 | } | |
377 | gss_cred->gc_upcall_timestamp = jiffies; | |
378 | gss_cred->gc_upcall = NULL; | |
379 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
380 | } | |
381 | ||
1da177e4 LT |
382 | static void |
383 | gss_upcall_callback(struct rpc_task *task) | |
384 | { | |
a17c2153 | 385 | struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, |
1da177e4 LT |
386 | struct gss_cred, gc_base); |
387 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
9beae467 | 388 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 389 | |
9beae467 | 390 | spin_lock(&pipe->lock); |
126e216a | 391 | gss_handle_downcall_result(gss_cred, gss_msg); |
9beae467 | 392 | spin_unlock(&pipe->lock); |
126e216a | 393 | task->tk_status = gss_msg->msg.errno; |
1da177e4 LT |
394 | gss_release_msg(gss_msg); |
395 | } | |
396 | ||
34769fc4 BF |
397 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) |
398 | { | |
90602c7b EB |
399 | uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); |
400 | memcpy(gss_msg->databuf, &uid, sizeof(uid)); | |
401 | gss_msg->msg.data = gss_msg->databuf; | |
402 | gss_msg->msg.len = sizeof(uid); | |
403 | BUG_ON(sizeof(uid) > UPCALL_BUF_LEN); | |
34769fc4 BF |
404 | } |
405 | ||
8b1c7bf5 | 406 | static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
68c97153 TM |
407 | struct rpc_clnt *clnt, |
408 | const char *service_name) | |
34769fc4 | 409 | { |
683ac665 | 410 | struct gss_api_mech *mech = gss_msg->auth->mech; |
8b1c7bf5 OK |
411 | char *p = gss_msg->databuf; |
412 | int len = 0; | |
413 | ||
414 | gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ", | |
683ac665 | 415 | mech->gm_name, |
90602c7b | 416 | from_kuid(&init_user_ns, gss_msg->uid)); |
8b1c7bf5 OK |
417 | p += gss_msg->msg.len; |
418 | if (clnt->cl_principal) { | |
419 | len = sprintf(p, "target=%s ", clnt->cl_principal); | |
420 | p += len; | |
421 | gss_msg->msg.len += len; | |
422 | } | |
68c97153 TM |
423 | if (service_name != NULL) { |
424 | len = sprintf(p, "service=%s ", service_name); | |
2efef708 OK |
425 | p += len; |
426 | gss_msg->msg.len += len; | |
427 | } | |
683ac665 | 428 | if (mech->gm_upcall_enctypes) { |
f8628220 | 429 | len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes); |
683ac665 TM |
430 | p += len; |
431 | gss_msg->msg.len += len; | |
432 | } | |
8b1c7bf5 OK |
433 | len = sprintf(p, "\n"); |
434 | gss_msg->msg.len += len; | |
435 | ||
34769fc4 BF |
436 | gss_msg->msg.data = gss_msg->databuf; |
437 | BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN); | |
438 | } | |
439 | ||
8b1c7bf5 | 440 | static void gss_encode_msg(struct gss_upcall_msg *gss_msg, |
68c97153 TM |
441 | struct rpc_clnt *clnt, |
442 | const char *service_name) | |
34769fc4 BF |
443 | { |
444 | if (pipe_version == 0) | |
445 | gss_encode_v0_msg(gss_msg); | |
446 | else /* pipe_version == 1 */ | |
68c97153 | 447 | gss_encode_v1_msg(gss_msg, clnt, service_name); |
34769fc4 BF |
448 | } |
449 | ||
68c97153 TM |
450 | static struct gss_upcall_msg * |
451 | gss_alloc_msg(struct gss_auth *gss_auth, struct rpc_clnt *clnt, | |
7eaf040b | 452 | kuid_t uid, const char *service_name) |
1da177e4 LT |
453 | { |
454 | struct gss_upcall_msg *gss_msg; | |
79a3f20b | 455 | int vers; |
1da177e4 | 456 | |
0f38b873 | 457 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
db75b3d6 BF |
458 | if (gss_msg == NULL) |
459 | return ERR_PTR(-ENOMEM); | |
79a3f20b BF |
460 | vers = get_pipe_version(); |
461 | if (vers < 0) { | |
462 | kfree(gss_msg); | |
463 | return ERR_PTR(vers); | |
464 | } | |
c239d83b | 465 | gss_msg->pipe = gss_auth->pipe[vers]; |
db75b3d6 BF |
466 | INIT_LIST_HEAD(&gss_msg->list); |
467 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
468 | init_waitqueue_head(&gss_msg->waitqueue); | |
469 | atomic_set(&gss_msg->count, 1); | |
db75b3d6 BF |
470 | gss_msg->uid = uid; |
471 | gss_msg->auth = gss_auth; | |
68c97153 | 472 | gss_encode_msg(gss_msg, clnt, service_name); |
1da177e4 LT |
473 | return gss_msg; |
474 | } | |
475 | ||
476 | static struct gss_upcall_msg * | |
477 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
478 | { | |
7c67db3a TM |
479 | struct gss_cred *gss_cred = container_of(cred, |
480 | struct gss_cred, gc_base); | |
1da177e4 | 481 | struct gss_upcall_msg *gss_new, *gss_msg; |
7eaf040b | 482 | kuid_t uid = cred->cr_uid; |
1da177e4 | 483 | |
68c97153 | 484 | gss_new = gss_alloc_msg(gss_auth, clnt, uid, gss_cred->gc_principal); |
db75b3d6 BF |
485 | if (IS_ERR(gss_new)) |
486 | return gss_new; | |
053e324f | 487 | gss_msg = gss_add_msg(gss_new); |
1da177e4 | 488 | if (gss_msg == gss_new) { |
9beae467 | 489 | int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); |
1da177e4 LT |
490 | if (res) { |
491 | gss_unhash_msg(gss_new); | |
492 | gss_msg = ERR_PTR(res); | |
493 | } | |
494 | } else | |
495 | gss_release_msg(gss_new); | |
496 | return gss_msg; | |
497 | } | |
498 | ||
b03568c3 BF |
499 | static void warn_gssd(void) |
500 | { | |
501 | static unsigned long ratelimit; | |
502 | unsigned long now = jiffies; | |
503 | ||
504 | if (time_after(now, ratelimit)) { | |
505 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" | |
506 | "Please check user daemon is running.\n"); | |
507 | ratelimit = now + 15*HZ; | |
508 | } | |
509 | } | |
510 | ||
1da177e4 LT |
511 | static inline int |
512 | gss_refresh_upcall(struct rpc_task *task) | |
513 | { | |
a17c2153 | 514 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
4a8c1344 | 515 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
516 | struct gss_auth, rpc_auth); |
517 | struct gss_cred *gss_cred = container_of(cred, | |
518 | struct gss_cred, gc_base); | |
519 | struct gss_upcall_msg *gss_msg; | |
9beae467 | 520 | struct rpc_pipe *pipe; |
1da177e4 LT |
521 | int err = 0; |
522 | ||
632f0d05 | 523 | dprintk("RPC: %5u %s for uid %u\n", |
cdba321e | 524 | task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid)); |
1da177e4 | 525 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
480e3243 | 526 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
79a3f20b BF |
527 | /* XXX: warning on the first, under the assumption we |
528 | * shouldn't normally hit this case on a refresh. */ | |
529 | warn_gssd(); | |
530 | task->tk_timeout = 15*HZ; | |
531 | rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); | |
d1a8016a | 532 | return -EAGAIN; |
79a3f20b | 533 | } |
1da177e4 LT |
534 | if (IS_ERR(gss_msg)) { |
535 | err = PTR_ERR(gss_msg); | |
536 | goto out; | |
537 | } | |
9beae467 SK |
538 | pipe = gss_msg->pipe; |
539 | spin_lock(&pipe->lock); | |
1da177e4 | 540 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 541 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
126e216a | 542 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
1da177e4 LT |
543 | task->tk_timeout = 0; |
544 | gss_cred->gc_upcall = gss_msg; | |
545 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
546 | atomic_inc(&gss_msg->count); | |
5d00837b | 547 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
126e216a TM |
548 | } else { |
549 | gss_handle_downcall_result(gss_cred, gss_msg); | |
1da177e4 | 550 | err = gss_msg->msg.errno; |
126e216a | 551 | } |
9beae467 | 552 | spin_unlock(&pipe->lock); |
1da177e4 LT |
553 | gss_release_msg(gss_msg); |
554 | out: | |
632f0d05 | 555 | dprintk("RPC: %5u %s for uid %u result %d\n", |
cdba321e EB |
556 | task->tk_pid, __func__, |
557 | from_kuid(&init_user_ns, cred->cr_uid), err); | |
1da177e4 LT |
558 | return err; |
559 | } | |
560 | ||
561 | static inline int | |
562 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
563 | { | |
abfdbd53 TM |
564 | struct net *net = rpc_net_ns(gss_auth->client); |
565 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
9beae467 | 566 | struct rpc_pipe *pipe; |
1da177e4 LT |
567 | struct rpc_cred *cred = &gss_cred->gc_base; |
568 | struct gss_upcall_msg *gss_msg; | |
abfdbd53 | 569 | unsigned long timeout; |
1da177e4 | 570 | DEFINE_WAIT(wait); |
d36ccb9c | 571 | int err; |
1da177e4 | 572 | |
cdba321e EB |
573 | dprintk("RPC: %s for uid %u\n", |
574 | __func__, from_kuid(&init_user_ns, cred->cr_uid)); | |
79a3f20b | 575 | retry: |
d36ccb9c | 576 | err = 0; |
abfdbd53 TM |
577 | /* Default timeout is 15s unless we know that gssd is not running */ |
578 | timeout = 15 * HZ; | |
579 | if (!sn->gssd_running) | |
580 | timeout = HZ >> 2; | |
1da177e4 | 581 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
79a3f20b BF |
582 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
583 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, | |
abfdbd53 | 584 | pipe_version >= 0, timeout); |
d1a8016a | 585 | if (pipe_version < 0) { |
abfdbd53 TM |
586 | if (err == 0) |
587 | sn->gssd_running = 0; | |
d1a8016a BS |
588 | warn_gssd(); |
589 | err = -EACCES; | |
590 | } | |
d36ccb9c | 591 | if (err < 0) |
79a3f20b | 592 | goto out; |
79a3f20b BF |
593 | goto retry; |
594 | } | |
1da177e4 LT |
595 | if (IS_ERR(gss_msg)) { |
596 | err = PTR_ERR(gss_msg); | |
597 | goto out; | |
598 | } | |
9beae467 | 599 | pipe = gss_msg->pipe; |
1da177e4 | 600 | for (;;) { |
5afa9133 | 601 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); |
9beae467 | 602 | spin_lock(&pipe->lock); |
1da177e4 | 603 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
604 | break; |
605 | } | |
9beae467 | 606 | spin_unlock(&pipe->lock); |
5afa9133 | 607 | if (fatal_signal_pending(current)) { |
1da177e4 LT |
608 | err = -ERESTARTSYS; |
609 | goto out_intr; | |
610 | } | |
611 | schedule(); | |
612 | } | |
613 | if (gss_msg->ctx) | |
7b6962b0 | 614 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
615 | else |
616 | err = gss_msg->msg.errno; | |
9beae467 | 617 | spin_unlock(&pipe->lock); |
1da177e4 LT |
618 | out_intr: |
619 | finish_wait(&gss_msg->waitqueue, &wait); | |
620 | gss_release_msg(gss_msg); | |
621 | out: | |
632f0d05 | 622 | dprintk("RPC: %s for uid %u result %d\n", |
cdba321e | 623 | __func__, from_kuid(&init_user_ns, cred->cr_uid), err); |
1da177e4 LT |
624 | return err; |
625 | } | |
626 | ||
1da177e4 LT |
627 | #define MSG_BUF_MAXSIZE 1024 |
628 | ||
629 | static ssize_t | |
630 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
631 | { | |
632 | const void *p, *end; | |
633 | void *buf; | |
1da177e4 | 634 | struct gss_upcall_msg *gss_msg; |
496ad9aa | 635 | struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; |
1da177e4 | 636 | struct gss_cl_ctx *ctx; |
90602c7b EB |
637 | uid_t id; |
638 | kuid_t uid; | |
3b68aaea | 639 | ssize_t err = -EFBIG; |
1da177e4 LT |
640 | |
641 | if (mlen > MSG_BUF_MAXSIZE) | |
642 | goto out; | |
643 | err = -ENOMEM; | |
0f38b873 | 644 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
645 | if (!buf) |
646 | goto out; | |
647 | ||
1da177e4 LT |
648 | err = -EFAULT; |
649 | if (copy_from_user(buf, src, mlen)) | |
650 | goto err; | |
651 | ||
652 | end = (const void *)((char *)buf + mlen); | |
90602c7b | 653 | p = simple_get_bytes(buf, end, &id, sizeof(id)); |
1da177e4 LT |
654 | if (IS_ERR(p)) { |
655 | err = PTR_ERR(p); | |
656 | goto err; | |
657 | } | |
658 | ||
90602c7b EB |
659 | uid = make_kuid(&init_user_ns, id); |
660 | if (!uid_valid(uid)) { | |
661 | err = -EINVAL; | |
662 | goto err; | |
663 | } | |
664 | ||
1da177e4 LT |
665 | err = -ENOMEM; |
666 | ctx = gss_alloc_context(); | |
667 | if (ctx == NULL) | |
668 | goto err; | |
3b68aaea TM |
669 | |
670 | err = -ENOENT; | |
671 | /* Find a matching upcall */ | |
9beae467 SK |
672 | spin_lock(&pipe->lock); |
673 | gss_msg = __gss_find_upcall(pipe, uid); | |
3b68aaea | 674 | if (gss_msg == NULL) { |
9beae467 | 675 | spin_unlock(&pipe->lock); |
3b68aaea TM |
676 | goto err_put_ctx; |
677 | } | |
678 | list_del_init(&gss_msg->list); | |
9beae467 | 679 | spin_unlock(&pipe->lock); |
3b68aaea | 680 | |
6e84c7b6 | 681 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
682 | if (IS_ERR(p)) { |
683 | err = PTR_ERR(p); | |
486bad2e JL |
684 | switch (err) { |
685 | case -EACCES: | |
dc5ddce9 | 686 | case -EKEYEXPIRED: |
486bad2e JL |
687 | gss_msg->msg.errno = err; |
688 | err = mlen; | |
689 | break; | |
690 | case -EFAULT: | |
691 | case -ENOMEM: | |
692 | case -EINVAL: | |
693 | case -ENOSYS: | |
694 | gss_msg->msg.errno = -EAGAIN; | |
695 | break; | |
696 | default: | |
697 | printk(KERN_CRIT "%s: bad return from " | |
6c853099 | 698 | "gss_fill_context: %zd\n", __func__, err); |
486bad2e JL |
699 | BUG(); |
700 | } | |
3b68aaea | 701 | goto err_release_msg; |
1da177e4 | 702 | } |
3b68aaea TM |
703 | gss_msg->ctx = gss_get_ctx(ctx); |
704 | err = mlen; | |
705 | ||
706 | err_release_msg: | |
9beae467 | 707 | spin_lock(&pipe->lock); |
3b68aaea | 708 | __gss_unhash_msg(gss_msg); |
9beae467 | 709 | spin_unlock(&pipe->lock); |
3b68aaea | 710 | gss_release_msg(gss_msg); |
1da177e4 LT |
711 | err_put_ctx: |
712 | gss_put_ctx(ctx); | |
713 | err: | |
714 | kfree(buf); | |
715 | out: | |
632f0d05 | 716 | dprintk("RPC: %s returning %Zd\n", __func__, err); |
1da177e4 LT |
717 | return err; |
718 | } | |
719 | ||
34769fc4 | 720 | static int gss_pipe_open(struct inode *inode, int new_version) |
cf81939d | 721 | { |
34769fc4 BF |
722 | int ret = 0; |
723 | ||
79a3f20b BF |
724 | spin_lock(&pipe_version_lock); |
725 | if (pipe_version < 0) { | |
34769fc4 BF |
726 | /* First open of any gss pipe determines the version: */ |
727 | pipe_version = new_version; | |
79a3f20b BF |
728 | rpc_wake_up(&pipe_version_rpc_waitqueue); |
729 | wake_up(&pipe_version_waitqueue); | |
34769fc4 BF |
730 | } else if (pipe_version != new_version) { |
731 | /* Trying to open a pipe of a different version */ | |
732 | ret = -EBUSY; | |
733 | goto out; | |
79a3f20b | 734 | } |
cf81939d | 735 | atomic_inc(&pipe_users); |
34769fc4 | 736 | out: |
79a3f20b | 737 | spin_unlock(&pipe_version_lock); |
34769fc4 BF |
738 | return ret; |
739 | ||
740 | } | |
741 | ||
742 | static int gss_pipe_open_v0(struct inode *inode) | |
743 | { | |
744 | return gss_pipe_open(inode, 0); | |
745 | } | |
746 | ||
747 | static int gss_pipe_open_v1(struct inode *inode) | |
748 | { | |
749 | return gss_pipe_open(inode, 1); | |
cf81939d BF |
750 | } |
751 | ||
1da177e4 LT |
752 | static void |
753 | gss_pipe_release(struct inode *inode) | |
754 | { | |
9beae467 | 755 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
6e84c7b6 | 756 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 757 | |
5a67657a | 758 | restart: |
9beae467 SK |
759 | spin_lock(&pipe->lock); |
760 | list_for_each_entry(gss_msg, &pipe->in_downcall, list) { | |
1da177e4 | 761 | |
5a67657a TM |
762 | if (!list_empty(&gss_msg->msg.list)) |
763 | continue; | |
1da177e4 LT |
764 | gss_msg->msg.errno = -EPIPE; |
765 | atomic_inc(&gss_msg->count); | |
766 | __gss_unhash_msg(gss_msg); | |
9beae467 | 767 | spin_unlock(&pipe->lock); |
1da177e4 | 768 | gss_release_msg(gss_msg); |
5a67657a | 769 | goto restart; |
1da177e4 | 770 | } |
9beae467 | 771 | spin_unlock(&pipe->lock); |
cf81939d | 772 | |
79a3f20b | 773 | put_pipe_version(); |
1da177e4 LT |
774 | } |
775 | ||
776 | static void | |
777 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
778 | { | |
779 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
1da177e4 LT |
780 | |
781 | if (msg->errno < 0) { | |
632f0d05 CL |
782 | dprintk("RPC: %s releasing msg %p\n", |
783 | __func__, gss_msg); | |
1da177e4 LT |
784 | atomic_inc(&gss_msg->count); |
785 | gss_unhash_msg(gss_msg); | |
b03568c3 BF |
786 | if (msg->errno == -ETIMEDOUT) |
787 | warn_gssd(); | |
1da177e4 LT |
788 | gss_release_msg(gss_msg); |
789 | } | |
790 | } | |
791 | ||
ccdc28f8 SK |
792 | static void gss_pipes_dentries_destroy(struct rpc_auth *auth) |
793 | { | |
794 | struct gss_auth *gss_auth; | |
795 | ||
796 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
80df9d20 SK |
797 | if (gss_auth->pipe[0]->dentry) |
798 | rpc_unlink(gss_auth->pipe[0]->dentry); | |
799 | if (gss_auth->pipe[1]->dentry) | |
800 | rpc_unlink(gss_auth->pipe[1]->dentry); | |
ccdc28f8 SK |
801 | } |
802 | ||
803 | static int gss_pipes_dentries_create(struct rpc_auth *auth) | |
804 | { | |
805 | int err; | |
806 | struct gss_auth *gss_auth; | |
807 | struct rpc_clnt *clnt; | |
808 | ||
809 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
810 | clnt = gss_auth->client; | |
811 | ||
30507f58 | 812 | gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry, |
ccdc28f8 SK |
813 | "gssd", |
814 | clnt, gss_auth->pipe[1]); | |
815 | if (IS_ERR(gss_auth->pipe[1]->dentry)) | |
816 | return PTR_ERR(gss_auth->pipe[1]->dentry); | |
30507f58 | 817 | gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry, |
ccdc28f8 SK |
818 | gss_auth->mech->gm_name, |
819 | clnt, gss_auth->pipe[0]); | |
820 | if (IS_ERR(gss_auth->pipe[0]->dentry)) { | |
821 | err = PTR_ERR(gss_auth->pipe[0]->dentry); | |
822 | goto err_unlink_pipe_1; | |
823 | } | |
824 | return 0; | |
825 | ||
826 | err_unlink_pipe_1: | |
827 | rpc_unlink(gss_auth->pipe[1]->dentry); | |
828 | return err; | |
829 | } | |
830 | ||
831 | static void gss_pipes_dentries_destroy_net(struct rpc_clnt *clnt, | |
832 | struct rpc_auth *auth) | |
833 | { | |
2446ab60 | 834 | struct net *net = rpc_net_ns(clnt); |
ccdc28f8 SK |
835 | struct super_block *sb; |
836 | ||
837 | sb = rpc_get_sb_net(net); | |
838 | if (sb) { | |
30507f58 | 839 | if (clnt->cl_dentry) |
ccdc28f8 SK |
840 | gss_pipes_dentries_destroy(auth); |
841 | rpc_put_sb_net(net); | |
842 | } | |
843 | } | |
844 | ||
845 | static int gss_pipes_dentries_create_net(struct rpc_clnt *clnt, | |
846 | struct rpc_auth *auth) | |
847 | { | |
2446ab60 | 848 | struct net *net = rpc_net_ns(clnt); |
ccdc28f8 SK |
849 | struct super_block *sb; |
850 | int err = 0; | |
851 | ||
852 | sb = rpc_get_sb_net(net); | |
853 | if (sb) { | |
30507f58 | 854 | if (clnt->cl_dentry) |
ccdc28f8 SK |
855 | err = gss_pipes_dentries_create(auth); |
856 | rpc_put_sb_net(net); | |
857 | } | |
858 | return err; | |
859 | } | |
860 | ||
cca5172a YH |
861 | /* |
862 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
863 | * parameters based on the input flavor (which must be a pseudoflavor) |
864 | */ | |
865 | static struct rpc_auth * | |
866 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
867 | { | |
868 | struct gss_auth *gss_auth; | |
869 | struct rpc_auth * auth; | |
6a19275a | 870 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 871 | |
8885cb36 | 872 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
873 | |
874 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 875 | return ERR_PTR(err); |
1da177e4 LT |
876 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
877 | goto out_dec; | |
878 | gss_auth->client = clnt; | |
6a19275a | 879 | err = -EINVAL; |
1da177e4 LT |
880 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
881 | if (!gss_auth->mech) { | |
9b1d75b7 | 882 | dprintk("RPC: Pseudoflavor %d not found!\n", flavor); |
1da177e4 LT |
883 | goto err_free; |
884 | } | |
885 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
886 | if (gss_auth->service == 0) |
887 | goto err_put_mech; | |
1da177e4 LT |
888 | auth = &gss_auth->rpc_auth; |
889 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
890 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
891 | auth->au_ops = &authgss_ops; | |
892 | auth->au_flavor = flavor; | |
893 | atomic_set(&auth->au_count, 1); | |
0285ed1f | 894 | kref_init(&gss_auth->kref); |
1da177e4 | 895 | |
34769fc4 BF |
896 | /* |
897 | * Note: if we created the old pipe first, then someone who | |
898 | * examined the directory at the right moment might conclude | |
899 | * that we supported only the old pipe. So we instead create | |
900 | * the new pipe first. | |
901 | */ | |
c239d83b SK |
902 | gss_auth->pipe[1] = rpc_mkpipe_data(&gss_upcall_ops_v1, |
903 | RPC_PIPE_WAIT_FOR_OPEN); | |
904 | if (IS_ERR(gss_auth->pipe[1])) { | |
905 | err = PTR_ERR(gss_auth->pipe[1]); | |
1da177e4 | 906 | goto err_put_mech; |
6a19275a | 907 | } |
1da177e4 | 908 | |
c239d83b SK |
909 | gss_auth->pipe[0] = rpc_mkpipe_data(&gss_upcall_ops_v0, |
910 | RPC_PIPE_WAIT_FOR_OPEN); | |
911 | if (IS_ERR(gss_auth->pipe[0])) { | |
912 | err = PTR_ERR(gss_auth->pipe[0]); | |
913 | goto err_destroy_pipe_1; | |
914 | } | |
ccdc28f8 SK |
915 | err = gss_pipes_dentries_create_net(clnt, auth); |
916 | if (err) | |
c239d83b | 917 | goto err_destroy_pipe_0; |
f5c2187c | 918 | err = rpcauth_init_credcache(auth); |
07a2bf1d | 919 | if (err) |
ccdc28f8 | 920 | goto err_unlink_pipes; |
07a2bf1d | 921 | |
1da177e4 | 922 | return auth; |
ccdc28f8 SK |
923 | err_unlink_pipes: |
924 | gss_pipes_dentries_destroy_net(clnt, auth); | |
c239d83b SK |
925 | err_destroy_pipe_0: |
926 | rpc_destroy_pipe_data(gss_auth->pipe[0]); | |
927 | err_destroy_pipe_1: | |
928 | rpc_destroy_pipe_data(gss_auth->pipe[1]); | |
1da177e4 LT |
929 | err_put_mech: |
930 | gss_mech_put(gss_auth->mech); | |
931 | err_free: | |
932 | kfree(gss_auth); | |
933 | out_dec: | |
934 | module_put(THIS_MODULE); | |
6a19275a | 935 | return ERR_PTR(err); |
1da177e4 LT |
936 | } |
937 | ||
0285ed1f TM |
938 | static void |
939 | gss_free(struct gss_auth *gss_auth) | |
940 | { | |
ccdc28f8 | 941 | gss_pipes_dentries_destroy_net(gss_auth->client, &gss_auth->rpc_auth); |
c239d83b SK |
942 | rpc_destroy_pipe_data(gss_auth->pipe[0]); |
943 | rpc_destroy_pipe_data(gss_auth->pipe[1]); | |
0285ed1f TM |
944 | gss_mech_put(gss_auth->mech); |
945 | ||
946 | kfree(gss_auth); | |
947 | module_put(THIS_MODULE); | |
948 | } | |
949 | ||
950 | static void | |
951 | gss_free_callback(struct kref *kref) | |
952 | { | |
953 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
954 | ||
955 | gss_free(gss_auth); | |
956 | } | |
957 | ||
1da177e4 LT |
958 | static void |
959 | gss_destroy(struct rpc_auth *auth) | |
960 | { | |
961 | struct gss_auth *gss_auth; | |
962 | ||
8885cb36 CL |
963 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
964 | auth, auth->au_flavor); | |
1da177e4 | 965 | |
3ab9bb72 TM |
966 | rpcauth_destroy_credcache(auth); |
967 | ||
1da177e4 | 968 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
0285ed1f | 969 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
970 | } |
971 | ||
0df7fb74 TM |
972 | /* |
973 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
974 | * to the server with the GSS control procedure field set to | |
975 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
976 | * all RPCSEC_GSS state associated with that context. | |
977 | */ | |
978 | static int | |
979 | gss_destroying_context(struct rpc_cred *cred) | |
980 | { | |
981 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
982 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
983 | struct rpc_task *task; | |
984 | ||
985 | if (gss_cred->gc_ctx == NULL || | |
6dcd3926 | 986 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
0df7fb74 TM |
987 | return 0; |
988 | ||
989 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
990 | cred->cr_ops = &gss_nullops; | |
991 | ||
992 | /* Take a reference to ensure the cred will be destroyed either | |
993 | * by the RPC call or by the put_rpccred() below */ | |
994 | get_rpccred(cred); | |
995 | ||
080a1f14 | 996 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
0df7fb74 TM |
997 | if (!IS_ERR(task)) |
998 | rpc_put_task(task); | |
999 | ||
1000 | put_rpccred(cred); | |
1001 | return 1; | |
1002 | } | |
1003 | ||
1004 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
1005 | * to create a new cred or context, so they check that things have been |
1006 | * allocated before freeing them. */ | |
1007 | static void | |
5d28dc82 | 1008 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 1009 | { |
632f0d05 | 1010 | dprintk("RPC: %s\n", __func__); |
1da177e4 | 1011 | |
0d8a3746 | 1012 | gss_delete_sec_context(&ctx->gc_gss_ctx); |
1da177e4 LT |
1013 | kfree(ctx->gc_wire_ctx.data); |
1014 | kfree(ctx); | |
1015 | } | |
1016 | ||
5d28dc82 TM |
1017 | static void |
1018 | gss_free_ctx_callback(struct rcu_head *head) | |
1019 | { | |
1020 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
1021 | gss_do_free_ctx(ctx); | |
1022 | } | |
1023 | ||
1024 | static void | |
1025 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
1026 | { | |
1027 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); | |
1028 | } | |
1029 | ||
1da177e4 | 1030 | static void |
31be5bf1 | 1031 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 1032 | { |
632f0d05 | 1033 | dprintk("RPC: %s cred=%p\n", __func__, gss_cred); |
31be5bf1 TM |
1034 | kfree(gss_cred); |
1035 | } | |
1da177e4 | 1036 | |
31be5bf1 TM |
1037 | static void |
1038 | gss_free_cred_callback(struct rcu_head *head) | |
1039 | { | |
1040 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
1041 | gss_free_cred(gss_cred); | |
1042 | } | |
1da177e4 | 1043 | |
31be5bf1 | 1044 | static void |
6dcd3926 | 1045 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 1046 | { |
5d28dc82 | 1047 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 1048 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
5d28dc82 TM |
1049 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
1050 | ||
a9b3cd7f | 1051 | RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); |
31be5bf1 | 1052 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
1053 | if (ctx) |
1054 | gss_put_ctx(ctx); | |
0285ed1f | 1055 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
1056 | } |
1057 | ||
6dcd3926 JL |
1058 | static void |
1059 | gss_destroy_cred(struct rpc_cred *cred) | |
1060 | { | |
1061 | ||
1062 | if (gss_destroying_context(cred)) | |
1063 | return; | |
1064 | gss_destroy_nullcred(cred); | |
1065 | } | |
1066 | ||
1da177e4 LT |
1067 | /* |
1068 | * Lookup RPCSEC_GSS cred for the current process | |
1069 | */ | |
1070 | static struct rpc_cred * | |
8a317760 | 1071 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 1072 | { |
8a317760 | 1073 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
1074 | } |
1075 | ||
1076 | static struct rpc_cred * | |
8a317760 | 1077 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
1078 | { |
1079 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1080 | struct gss_cred *cred = NULL; | |
1081 | int err = -ENOMEM; | |
1082 | ||
632f0d05 | 1083 | dprintk("RPC: %s for uid %d, flavor %d\n", |
cdba321e EB |
1084 | __func__, from_kuid(&init_user_ns, acred->uid), |
1085 | auth->au_flavor); | |
1da177e4 | 1086 | |
0f38b873 | 1087 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
1da177e4 LT |
1088 | goto out_err; |
1089 | ||
5fe4755e | 1090 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
1091 | /* |
1092 | * Note: in order to force a call to call_refresh(), we deliberately | |
1093 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
1094 | */ | |
fc432dd9 | 1095 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 1096 | cred->gc_service = gss_auth->service; |
68c97153 TM |
1097 | cred->gc_principal = NULL; |
1098 | if (acred->machine_cred) | |
1099 | cred->gc_principal = acred->principal; | |
0285ed1f | 1100 | kref_get(&gss_auth->kref); |
1da177e4 LT |
1101 | return &cred->gc_base; |
1102 | ||
1103 | out_err: | |
632f0d05 | 1104 | dprintk("RPC: %s failed with error %d\n", __func__, err); |
1da177e4 LT |
1105 | return ERR_PTR(err); |
1106 | } | |
1107 | ||
fba3bad4 TM |
1108 | static int |
1109 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
1110 | { | |
1111 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1112 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
1113 | int err; | |
1114 | ||
1115 | do { | |
1116 | err = gss_create_upcall(gss_auth, gss_cred); | |
1117 | } while (err == -EAGAIN); | |
1118 | return err; | |
1119 | } | |
1120 | ||
1da177e4 | 1121 | static int |
8a317760 | 1122 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
1123 | { |
1124 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
1125 | ||
cd019f75 | 1126 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 1127 | goto out; |
1da177e4 | 1128 | /* Don't match with creds that have expired. */ |
cd019f75 TM |
1129 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
1130 | return 0; | |
1131 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1da177e4 | 1132 | return 0; |
8a317760 | 1133 | out: |
68c97153 TM |
1134 | if (acred->principal != NULL) { |
1135 | if (gss_cred->gc_principal == NULL) | |
1136 | return 0; | |
1137 | return strcmp(acred->principal, gss_cred->gc_principal) == 0; | |
1138 | } | |
1139 | if (gss_cred->gc_principal != NULL) | |
7c67db3a | 1140 | return 0; |
0b4d51b0 | 1141 | return uid_eq(rc->cr_uid, acred->uid); |
1da177e4 LT |
1142 | } |
1143 | ||
1144 | /* | |
1145 | * Marshal credentials. | |
1146 | * Maybe we should keep a cached credential for performance reasons. | |
1147 | */ | |
d8ed029d AD |
1148 | static __be32 * |
1149 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1150 | { |
a17c2153 TM |
1151 | struct rpc_rqst *req = task->tk_rqstp; |
1152 | struct rpc_cred *cred = req->rq_cred; | |
1da177e4 LT |
1153 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1154 | gc_base); | |
1155 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1156 | __be32 *cred_len; |
1da177e4 LT |
1157 | u32 maj_stat = 0; |
1158 | struct xdr_netobj mic; | |
1159 | struct kvec iov; | |
1160 | struct xdr_buf verf_buf; | |
1161 | ||
632f0d05 | 1162 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1163 | |
1164 | *p++ = htonl(RPC_AUTH_GSS); | |
1165 | cred_len = p++; | |
1166 | ||
1167 | spin_lock(&ctx->gc_seq_lock); | |
1168 | req->rq_seqno = ctx->gc_seq++; | |
1169 | spin_unlock(&ctx->gc_seq_lock); | |
1170 | ||
1171 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
1172 | *p++ = htonl((u32) ctx->gc_proc); | |
1173 | *p++ = htonl((u32) req->rq_seqno); | |
1174 | *p++ = htonl((u32) gss_cred->gc_service); | |
1175 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
1176 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
1177 | ||
1178 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
1179 | * starting with the xid and ending at the end of the credential: */ | |
a4f0835c | 1180 | iov.iov_base = xprt_skip_transport_header(req->rq_xprt, |
808012fb | 1181 | req->rq_snd_buf.head[0].iov_base); |
1da177e4 LT |
1182 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
1183 | xdr_buf_from_iov(&iov, &verf_buf); | |
1184 | ||
1185 | /* set verifier flavor*/ | |
1186 | *p++ = htonl(RPC_AUTH_GSS); | |
1187 | ||
1188 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 1189 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1190 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 1191 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1192 | } else if (maj_stat != 0) { |
1193 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
1194 | goto out_put_ctx; | |
1195 | } | |
1196 | p = xdr_encode_opaque(p, NULL, mic.len); | |
1197 | gss_put_ctx(ctx); | |
1198 | return p; | |
1199 | out_put_ctx: | |
1200 | gss_put_ctx(ctx); | |
1201 | return NULL; | |
1202 | } | |
1203 | ||
cd019f75 TM |
1204 | static int gss_renew_cred(struct rpc_task *task) |
1205 | { | |
a17c2153 | 1206 | struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1207 | struct gss_cred *gss_cred = container_of(oldcred, |
1208 | struct gss_cred, | |
1209 | gc_base); | |
1210 | struct rpc_auth *auth = oldcred->cr_auth; | |
1211 | struct auth_cred acred = { | |
1212 | .uid = oldcred->cr_uid, | |
68c97153 TM |
1213 | .principal = gss_cred->gc_principal, |
1214 | .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), | |
cd019f75 TM |
1215 | }; |
1216 | struct rpc_cred *new; | |
1217 | ||
1218 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
1219 | if (IS_ERR(new)) | |
1220 | return PTR_ERR(new); | |
a17c2153 | 1221 | task->tk_rqstp->rq_cred = new; |
cd019f75 TM |
1222 | put_rpccred(oldcred); |
1223 | return 0; | |
1224 | } | |
1225 | ||
126e216a TM |
1226 | static int gss_cred_is_negative_entry(struct rpc_cred *cred) |
1227 | { | |
1228 | if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { | |
1229 | unsigned long now = jiffies; | |
1230 | unsigned long begin, expire; | |
1231 | struct gss_cred *gss_cred; | |
1232 | ||
1233 | gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1234 | begin = gss_cred->gc_upcall_timestamp; | |
1235 | expire = begin + gss_expired_cred_retry_delay * HZ; | |
1236 | ||
1237 | if (time_in_range_open(now, begin, expire)) | |
1238 | return 1; | |
1239 | } | |
1240 | return 0; | |
1241 | } | |
1242 | ||
1da177e4 LT |
1243 | /* |
1244 | * Refresh credentials. XXX - finish | |
1245 | */ | |
1246 | static int | |
1247 | gss_refresh(struct rpc_task *task) | |
1248 | { | |
a17c2153 | 1249 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1250 | int ret = 0; |
1251 | ||
126e216a TM |
1252 | if (gss_cred_is_negative_entry(cred)) |
1253 | return -EKEYEXPIRED; | |
1254 | ||
cd019f75 TM |
1255 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
1256 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
1257 | ret = gss_renew_cred(task); | |
1258 | if (ret < 0) | |
1259 | goto out; | |
a17c2153 | 1260 | cred = task->tk_rqstp->rq_cred; |
cd019f75 | 1261 | } |
1da177e4 | 1262 | |
cd019f75 TM |
1263 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
1264 | ret = gss_refresh_upcall(task); | |
1265 | out: | |
1266 | return ret; | |
1da177e4 LT |
1267 | } |
1268 | ||
0df7fb74 TM |
1269 | /* Dummy refresh routine: used only when destroying the context */ |
1270 | static int | |
1271 | gss_refresh_null(struct rpc_task *task) | |
1272 | { | |
1273 | return -EACCES; | |
1274 | } | |
1275 | ||
d8ed029d AD |
1276 | static __be32 * |
1277 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1278 | { |
a17c2153 | 1279 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 | 1280 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 1281 | __be32 seq; |
1da177e4 LT |
1282 | struct kvec iov; |
1283 | struct xdr_buf verf_buf; | |
1284 | struct xdr_netobj mic; | |
1285 | u32 flav,len; | |
1286 | u32 maj_stat; | |
1287 | ||
632f0d05 | 1288 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1289 | |
1290 | flav = ntohl(*p++); | |
1291 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 1292 | goto out_bad; |
1da177e4 LT |
1293 | if (flav != RPC_AUTH_GSS) |
1294 | goto out_bad; | |
1295 | seq = htonl(task->tk_rqstp->rq_seqno); | |
1296 | iov.iov_base = &seq; | |
1297 | iov.iov_len = sizeof(seq); | |
1298 | xdr_buf_from_iov(&iov, &verf_buf); | |
1299 | mic.data = (u8 *)p; | |
1300 | mic.len = len; | |
1301 | ||
00fd6e14 | 1302 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1303 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1304 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 1305 | if (maj_stat) { |
632f0d05 CL |
1306 | dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", |
1307 | task->tk_pid, __func__, maj_stat); | |
1da177e4 | 1308 | goto out_bad; |
0df7fb74 | 1309 | } |
24b2605b BF |
1310 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1311 | * calculate the length of the verifier: */ | |
1be27f36 | 1312 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 1313 | gss_put_ctx(ctx); |
632f0d05 CL |
1314 | dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", |
1315 | task->tk_pid, __func__); | |
1da177e4 LT |
1316 | return p + XDR_QUADLEN(len); |
1317 | out_bad: | |
1318 | gss_put_ctx(ctx); | |
632f0d05 | 1319 | dprintk("RPC: %5u %s failed.\n", task->tk_pid, __func__); |
1da177e4 LT |
1320 | return NULL; |
1321 | } | |
1322 | ||
9f06c719 CL |
1323 | static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, |
1324 | __be32 *p, void *obj) | |
1325 | { | |
1326 | struct xdr_stream xdr; | |
1327 | ||
1328 | xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); | |
1329 | encode(rqstp, &xdr, obj); | |
1330 | } | |
1331 | ||
1da177e4 LT |
1332 | static inline int |
1333 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1334 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1335 | __be32 *p, void *obj) | |
1da177e4 LT |
1336 | { |
1337 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1338 | struct xdr_buf integ_buf; | |
d8ed029d | 1339 | __be32 *integ_len = NULL; |
1da177e4 | 1340 | struct xdr_netobj mic; |
d8ed029d AD |
1341 | u32 offset; |
1342 | __be32 *q; | |
1da177e4 LT |
1343 | struct kvec *iov; |
1344 | u32 maj_stat = 0; | |
1345 | int status = -EIO; | |
1346 | ||
1347 | integ_len = p++; | |
1348 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1349 | *p++ = htonl(rqstp->rq_seqno); | |
1350 | ||
9f06c719 | 1351 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1da177e4 LT |
1352 | |
1353 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1354 | offset, snd_buf->len - offset)) | |
1355 | return status; | |
1356 | *integ_len = htonl(integ_buf.len); | |
1357 | ||
1358 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1359 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1360 | iov = snd_buf->tail; |
1361 | else | |
1362 | iov = snd_buf->head; | |
1363 | p = iov->iov_base + iov->iov_len; | |
1364 | mic.data = (u8 *)(p + 1); | |
1365 | ||
00fd6e14 | 1366 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1367 | status = -EIO; /* XXX? */ |
1368 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1369 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1370 | else if (maj_stat) |
1371 | return status; | |
1372 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1373 | ||
1374 | offset = (u8 *)q - (u8 *)p; | |
1375 | iov->iov_len += offset; | |
1376 | snd_buf->len += offset; | |
1377 | return 0; | |
1378 | } | |
1379 | ||
2d2da60c BF |
1380 | static void |
1381 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1382 | { | |
1383 | int i; | |
1384 | ||
1385 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1386 | __free_page(rqstp->rq_enc_pages[i]); | |
1387 | kfree(rqstp->rq_enc_pages); | |
1388 | } | |
1389 | ||
1390 | static int | |
1391 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1392 | { | |
1393 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1394 | int first, last, i; | |
1395 | ||
1396 | if (snd_buf->page_len == 0) { | |
1397 | rqstp->rq_enc_pages_num = 0; | |
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1402 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1403 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1404 | rqstp->rq_enc_pages | |
1405 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1406 | GFP_NOFS); | |
1407 | if (!rqstp->rq_enc_pages) | |
1408 | goto out; | |
1409 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1410 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1411 | if (rqstp->rq_enc_pages[i] == NULL) | |
1412 | goto out_free; | |
1413 | } | |
1414 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1415 | return 0; | |
1416 | out_free: | |
cdead7cf TM |
1417 | rqstp->rq_enc_pages_num = i; |
1418 | priv_release_snd_buf(rqstp); | |
2d2da60c BF |
1419 | out: |
1420 | return -EAGAIN; | |
1421 | } | |
1422 | ||
1423 | static inline int | |
1424 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1425 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1426 | __be32 *p, void *obj) | |
2d2da60c BF |
1427 | { |
1428 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1429 | u32 offset; | |
1430 | u32 maj_stat; | |
1431 | int status; | |
d8ed029d | 1432 | __be32 *opaque_len; |
2d2da60c BF |
1433 | struct page **inpages; |
1434 | int first; | |
1435 | int pad; | |
1436 | struct kvec *iov; | |
1437 | char *tmp; | |
1438 | ||
1439 | opaque_len = p++; | |
1440 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1441 | *p++ = htonl(rqstp->rq_seqno); | |
1442 | ||
9f06c719 | 1443 | gss_wrap_req_encode(encode, rqstp, p, obj); |
2d2da60c BF |
1444 | |
1445 | status = alloc_enc_pages(rqstp); | |
1446 | if (status) | |
1447 | return status; | |
1448 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1449 | inpages = snd_buf->pages + first; | |
1450 | snd_buf->pages = rqstp->rq_enc_pages; | |
1451 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
7561042f KC |
1452 | /* |
1453 | * Give the tail its own page, in case we need extra space in the | |
1454 | * head when wrapping: | |
1455 | * | |
1456 | * call_allocate() allocates twice the slack space required | |
1457 | * by the authentication flavor to rq_callsize. | |
1458 | * For GSS, slack is GSS_CRED_SLACK. | |
1459 | */ | |
2d2da60c BF |
1460 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
1461 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1462 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1463 | snd_buf->tail[0].iov_base = tmp; | |
1464 | } | |
00fd6e14 | 1465 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
7561042f | 1466 | /* slack space should prevent this ever happening: */ |
2d2da60c | 1467 | BUG_ON(snd_buf->len > snd_buf->buflen); |
cca5172a | 1468 | status = -EIO; |
2d2da60c BF |
1469 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1470 | * done anyway, so it's safe to put the request on the wire: */ | |
1471 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1472 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1473 | else if (maj_stat) |
1474 | return status; | |
1475 | ||
1476 | *opaque_len = htonl(snd_buf->len - offset); | |
1477 | /* guess whether we're in the head or the tail: */ | |
1478 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1479 | iov = snd_buf->tail; | |
1480 | else | |
1481 | iov = snd_buf->head; | |
1482 | p = iov->iov_base + iov->iov_len; | |
1483 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1484 | memset(p, 0, pad); | |
1485 | iov->iov_len += pad; | |
1486 | snd_buf->len += pad; | |
1487 | ||
1488 | return 0; | |
1489 | } | |
1490 | ||
1da177e4 LT |
1491 | static int |
1492 | gss_wrap_req(struct rpc_task *task, | |
9f06c719 | 1493 | kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1494 | { |
a17c2153 | 1495 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1496 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1497 | gc_base); | |
1498 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1499 | int status = -EIO; | |
1500 | ||
632f0d05 | 1501 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1502 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1503 | /* The spec seems a little ambiguous here, but I think that not | |
1504 | * wrapping context destruction requests makes the most sense. | |
1505 | */ | |
9f06c719 CL |
1506 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1507 | status = 0; | |
1da177e4 LT |
1508 | goto out; |
1509 | } | |
1510 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1511 | case RPC_GSS_SVC_NONE: |
1512 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1513 | status = 0; | |
1514 | break; | |
1515 | case RPC_GSS_SVC_INTEGRITY: | |
1516 | status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); | |
1517 | break; | |
1518 | case RPC_GSS_SVC_PRIVACY: | |
1519 | status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); | |
1520 | break; | |
1da177e4 LT |
1521 | } |
1522 | out: | |
1523 | gss_put_ctx(ctx); | |
632f0d05 | 1524 | dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); |
1da177e4 LT |
1525 | return status; |
1526 | } | |
1527 | ||
1528 | static inline int | |
1529 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1530 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1531 | { |
1532 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1533 | struct xdr_buf integ_buf; | |
1534 | struct xdr_netobj mic; | |
1535 | u32 data_offset, mic_offset; | |
1536 | u32 integ_len; | |
1537 | u32 maj_stat; | |
1538 | int status = -EIO; | |
1539 | ||
1540 | integ_len = ntohl(*(*p)++); | |
1541 | if (integ_len & 3) | |
1542 | return status; | |
1543 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1544 | mic_offset = integ_len + data_offset; | |
1545 | if (mic_offset > rcv_buf->len) | |
1546 | return status; | |
1547 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1548 | return status; | |
1549 | ||
1550 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1551 | mic_offset - data_offset)) | |
1552 | return status; | |
1553 | ||
1554 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1555 | return status; | |
1556 | ||
00fd6e14 | 1557 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1558 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1559 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1560 | if (maj_stat != GSS_S_COMPLETE) |
1561 | return status; | |
1562 | return 0; | |
1563 | } | |
1564 | ||
2d2da60c BF |
1565 | static inline int |
1566 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1567 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1568 | { |
1569 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1570 | u32 offset; | |
1571 | u32 opaque_len; | |
1572 | u32 maj_stat; | |
1573 | int status = -EIO; | |
1574 | ||
1575 | opaque_len = ntohl(*(*p)++); | |
1576 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1577 | if (offset + opaque_len > rcv_buf->len) | |
1578 | return status; | |
1579 | /* remove padding: */ | |
1580 | rcv_buf->len = offset + opaque_len; | |
1581 | ||
00fd6e14 | 1582 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1583 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1584 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1585 | if (maj_stat != GSS_S_COMPLETE) |
1586 | return status; | |
1587 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1588 | return status; | |
1589 | ||
1590 | return 0; | |
1591 | } | |
1592 | ||
bf269551 CL |
1593 | static int |
1594 | gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, | |
1595 | __be32 *p, void *obj) | |
1596 | { | |
1597 | struct xdr_stream xdr; | |
1598 | ||
1599 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
1600 | return decode(rqstp, &xdr, obj); | |
1601 | } | |
2d2da60c | 1602 | |
1da177e4 LT |
1603 | static int |
1604 | gss_unwrap_resp(struct rpc_task *task, | |
bf269551 | 1605 | kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1606 | { |
a17c2153 | 1607 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1608 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1609 | gc_base); | |
1610 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1611 | __be32 *savedp = p; |
2d2da60c BF |
1612 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1613 | int savedlen = head->iov_len; | |
1da177e4 LT |
1614 | int status = -EIO; |
1615 | ||
1616 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1617 | goto out_decode; | |
1618 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1619 | case RPC_GSS_SVC_NONE: |
1620 | break; | |
1621 | case RPC_GSS_SVC_INTEGRITY: | |
1622 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1623 | if (status) | |
1624 | goto out; | |
1625 | break; | |
1626 | case RPC_GSS_SVC_PRIVACY: | |
1627 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); | |
1628 | if (status) | |
1629 | goto out; | |
1630 | break; | |
1da177e4 | 1631 | } |
24b2605b | 1632 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 1633 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 1634 | + (savedlen - head->iov_len); |
1da177e4 | 1635 | out_decode: |
bf269551 | 1636 | status = gss_unwrap_req_decode(decode, rqstp, p, obj); |
1da177e4 LT |
1637 | out: |
1638 | gss_put_ctx(ctx); | |
632f0d05 CL |
1639 | dprintk("RPC: %5u %s returning %d\n", |
1640 | task->tk_pid, __func__, status); | |
1da177e4 LT |
1641 | return status; |
1642 | } | |
cca5172a | 1643 | |
f1c0a861 | 1644 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1645 | .owner = THIS_MODULE, |
1646 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 1647 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
1648 | .create = gss_create, |
1649 | .destroy = gss_destroy, | |
1650 | .lookup_cred = gss_lookup_cred, | |
80df9d20 SK |
1651 | .crcreate = gss_create_cred, |
1652 | .pipes_create = gss_pipes_dentries_create, | |
1653 | .pipes_destroy = gss_pipes_dentries_destroy, | |
6a1a1e34 | 1654 | .list_pseudoflavors = gss_mech_list_pseudoflavors, |
9568c5e9 | 1655 | .info2flavor = gss_mech_info2flavor, |
a77c806f | 1656 | .flavor2info = gss_mech_flavor2info, |
1da177e4 LT |
1657 | }; |
1658 | ||
f1c0a861 | 1659 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1660 | .cr_name = "AUTH_GSS", |
1661 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1662 | .cr_init = gss_cred_init, |
5c691044 | 1663 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
1664 | .crmatch = gss_match, |
1665 | .crmarshal = gss_marshal, | |
1666 | .crrefresh = gss_refresh, | |
1667 | .crvalidate = gss_validate, | |
1668 | .crwrap_req = gss_wrap_req, | |
1669 | .crunwrap_resp = gss_unwrap_resp, | |
1670 | }; | |
1671 | ||
0df7fb74 TM |
1672 | static const struct rpc_credops gss_nullops = { |
1673 | .cr_name = "AUTH_GSS", | |
6dcd3926 | 1674 | .crdestroy = gss_destroy_nullcred, |
5c691044 | 1675 | .crbind = rpcauth_generic_bind_cred, |
0df7fb74 TM |
1676 | .crmatch = gss_match, |
1677 | .crmarshal = gss_marshal, | |
1678 | .crrefresh = gss_refresh_null, | |
1679 | .crvalidate = gss_validate, | |
1680 | .crwrap_req = gss_wrap_req, | |
1681 | .crunwrap_resp = gss_unwrap_resp, | |
1682 | }; | |
1683 | ||
b693ba4a | 1684 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
c1225158 | 1685 | .upcall = rpc_pipe_generic_upcall, |
34769fc4 BF |
1686 | .downcall = gss_pipe_downcall, |
1687 | .destroy_msg = gss_pipe_destroy_msg, | |
1688 | .open_pipe = gss_pipe_open_v0, | |
1689 | .release_pipe = gss_pipe_release, | |
1690 | }; | |
1691 | ||
b693ba4a | 1692 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
c1225158 | 1693 | .upcall = rpc_pipe_generic_upcall, |
1da177e4 LT |
1694 | .downcall = gss_pipe_downcall, |
1695 | .destroy_msg = gss_pipe_destroy_msg, | |
34769fc4 | 1696 | .open_pipe = gss_pipe_open_v1, |
1da177e4 LT |
1697 | .release_pipe = gss_pipe_release, |
1698 | }; | |
1699 | ||
a1db410d SK |
1700 | static __net_init int rpcsec_gss_init_net(struct net *net) |
1701 | { | |
1702 | return gss_svc_init_net(net); | |
1703 | } | |
1704 | ||
1705 | static __net_exit void rpcsec_gss_exit_net(struct net *net) | |
1706 | { | |
1707 | gss_svc_shutdown_net(net); | |
1708 | } | |
1709 | ||
1710 | static struct pernet_operations rpcsec_gss_net_ops = { | |
1711 | .init = rpcsec_gss_init_net, | |
1712 | .exit = rpcsec_gss_exit_net, | |
1713 | }; | |
1714 | ||
1da177e4 LT |
1715 | /* |
1716 | * Initialize RPCSEC_GSS module | |
1717 | */ | |
1718 | static int __init init_rpcsec_gss(void) | |
1719 | { | |
1720 | int err = 0; | |
1721 | ||
1722 | err = rpcauth_register(&authgss_ops); | |
1723 | if (err) | |
1724 | goto out; | |
1725 | err = gss_svc_init(); | |
1726 | if (err) | |
1727 | goto out_unregister; | |
a1db410d SK |
1728 | err = register_pernet_subsys(&rpcsec_gss_net_ops); |
1729 | if (err) | |
1730 | goto out_svc_exit; | |
79a3f20b | 1731 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
1da177e4 | 1732 | return 0; |
a1db410d SK |
1733 | out_svc_exit: |
1734 | gss_svc_shutdown(); | |
1da177e4 LT |
1735 | out_unregister: |
1736 | rpcauth_unregister(&authgss_ops); | |
1737 | out: | |
1738 | return err; | |
1739 | } | |
1740 | ||
1741 | static void __exit exit_rpcsec_gss(void) | |
1742 | { | |
a1db410d | 1743 | unregister_pernet_subsys(&rpcsec_gss_net_ops); |
1da177e4 LT |
1744 | gss_svc_shutdown(); |
1745 | rpcauth_unregister(&authgss_ops); | |
bf12691d | 1746 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1747 | } |
1748 | ||
71afa85e | 1749 | MODULE_ALIAS("rpc-auth-6"); |
1da177e4 | 1750 | MODULE_LICENSE("GPL"); |
126e216a TM |
1751 | module_param_named(expired_cred_retry_delay, |
1752 | gss_expired_cred_retry_delay, | |
1753 | uint, 0644); | |
1754 | MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " | |
1755 | "the RPC engine retries an expired credential"); | |
1756 | ||
1da177e4 LT |
1757 | module_init(init_rpcsec_gss) |
1758 | module_exit(exit_rpcsec_gss) |