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