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 LT |
59 | |
60 | #ifdef RPC_DEBUG | |
61 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
62 | #endif | |
63 | ||
d25a03cf | 64 | #define GSS_CRED_SLACK 1024 |
1da177e4 LT |
65 | /* length of a krb5 verifier (48), plus data added before arguments when |
66 | * using integrity (two 4-byte integers): */ | |
adeb8133 | 67 | #define GSS_VERF_SLACK 100 |
1da177e4 | 68 | |
1da177e4 | 69 | struct gss_auth { |
0285ed1f | 70 | struct kref kref; |
1da177e4 LT |
71 | struct rpc_auth rpc_auth; |
72 | struct gss_api_mech *mech; | |
73 | enum rpc_gss_svc service; | |
1da177e4 | 74 | struct rpc_clnt *client; |
34769fc4 BF |
75 | /* |
76 | * There are two upcall pipes; dentry[1], named "gssd", is used | |
77 | * for the new text-based upcall; dentry[0] is named after the | |
78 | * mechanism (for example, "krb5") and exists for | |
79 | * backwards-compatibility with older gssd's. | |
80 | */ | |
81 | struct dentry *dentry[2]; | |
1da177e4 LT |
82 | }; |
83 | ||
79a3f20b BF |
84 | /* pipe_version >= 0 if and only if someone has a pipe open. */ |
85 | static int pipe_version = -1; | |
cf81939d | 86 | static atomic_t pipe_users = ATOMIC_INIT(0); |
79a3f20b BF |
87 | static DEFINE_SPINLOCK(pipe_version_lock); |
88 | static struct rpc_wait_queue pipe_version_rpc_waitqueue; | |
89 | static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); | |
cf81939d | 90 | |
5d28dc82 | 91 | static void gss_free_ctx(struct gss_cl_ctx *); |
b693ba4a TM |
92 | static const struct rpc_pipe_ops gss_upcall_ops_v0; |
93 | static const struct rpc_pipe_ops gss_upcall_ops_v1; | |
1da177e4 | 94 | |
1da177e4 LT |
95 | static inline struct gss_cl_ctx * |
96 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
97 | { | |
98 | atomic_inc(&ctx->count); | |
99 | return ctx; | |
100 | } | |
101 | ||
102 | static inline void | |
103 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
104 | { | |
105 | if (atomic_dec_and_test(&ctx->count)) | |
5d28dc82 | 106 | gss_free_ctx(ctx); |
1da177e4 LT |
107 | } |
108 | ||
5d28dc82 TM |
109 | /* gss_cred_set_ctx: |
110 | * called by gss_upcall_callback and gss_create_upcall in order | |
111 | * to set the gss context. The actual exchange of an old context | |
112 | * and a new one is protected by the inode->i_lock. | |
113 | */ | |
1da177e4 LT |
114 | static void |
115 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
116 | { | |
117 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
5d28dc82 | 118 | |
cd019f75 TM |
119 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
120 | return; | |
7b6962b0 | 121 | gss_get_ctx(ctx); |
5d28dc82 | 122 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 | 123 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
cd019f75 | 124 | smp_mb__before_clear_bit(); |
fc432dd9 | 125 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
1da177e4 LT |
126 | } |
127 | ||
128 | static const void * | |
129 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
130 | { | |
131 | const void *q = (const void *)((const char *)p + len); | |
132 | if (unlikely(q > end || q < p)) | |
133 | return ERR_PTR(-EFAULT); | |
134 | memcpy(res, p, len); | |
135 | return q; | |
136 | } | |
137 | ||
138 | static inline const void * | |
139 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
140 | { | |
141 | const void *q; | |
142 | unsigned int len; | |
143 | ||
144 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
145 | if (IS_ERR(p)) | |
146 | return p; | |
147 | q = (const void *)((const char *)p + len); | |
148 | if (unlikely(q > end || q < p)) | |
149 | return ERR_PTR(-EFAULT); | |
0f38b873 | 150 | dest->data = kmemdup(p, len, GFP_NOFS); |
1da177e4 LT |
151 | if (unlikely(dest->data == NULL)) |
152 | return ERR_PTR(-ENOMEM); | |
153 | dest->len = len; | |
1da177e4 LT |
154 | return q; |
155 | } | |
156 | ||
157 | static struct gss_cl_ctx * | |
158 | gss_cred_get_ctx(struct rpc_cred *cred) | |
159 | { | |
160 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
161 | struct gss_cl_ctx *ctx = NULL; | |
162 | ||
5d28dc82 | 163 | rcu_read_lock(); |
1da177e4 LT |
164 | if (gss_cred->gc_ctx) |
165 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
5d28dc82 | 166 | rcu_read_unlock(); |
1da177e4 LT |
167 | return ctx; |
168 | } | |
169 | ||
170 | static struct gss_cl_ctx * | |
171 | gss_alloc_context(void) | |
172 | { | |
173 | struct gss_cl_ctx *ctx; | |
174 | ||
0f38b873 | 175 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
1da177e4 | 176 | if (ctx != NULL) { |
1da177e4 LT |
177 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
178 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
179 | spin_lock_init(&ctx->gc_seq_lock); | |
180 | atomic_set(&ctx->count,1); | |
181 | } | |
182 | return ctx; | |
183 | } | |
184 | ||
185 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
186 | static const void * | |
187 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
188 | { | |
189 | const void *q; | |
190 | unsigned int seclen; | |
191 | unsigned int timeout; | |
192 | u32 window_size; | |
193 | int ret; | |
194 | ||
195 | /* First unsigned int gives the lifetime (in seconds) of the cred */ | |
196 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); | |
197 | if (IS_ERR(p)) | |
198 | goto err; | |
199 | if (timeout == 0) | |
200 | timeout = GSSD_MIN_TIMEOUT; | |
201 | ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; | |
202 | /* Sequence number window. Determines the maximum number of simultaneous requests */ | |
203 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); | |
204 | if (IS_ERR(p)) | |
205 | goto err; | |
206 | ctx->gc_win = window_size; | |
207 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
208 | if (ctx->gc_win == 0) { | |
dc5ddce9 JL |
209 | /* |
210 | * in which case, p points to an error code. Anything other | |
211 | * than -EKEYEXPIRED gets converted to -EACCES. | |
212 | */ | |
213 | p = simple_get_bytes(p, end, &ret, sizeof(ret)); | |
214 | if (!IS_ERR(p)) | |
215 | p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : | |
216 | ERR_PTR(-EACCES); | |
1da177e4 LT |
217 | goto err; |
218 | } | |
219 | /* copy the opaque wire context */ | |
220 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
221 | if (IS_ERR(p)) | |
222 | goto err; | |
223 | /* import the opaque security context */ | |
224 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
225 | if (IS_ERR(p)) | |
226 | goto err; | |
227 | q = (const void *)((const char *)p + seclen); | |
228 | if (unlikely(q > end || q < p)) { | |
229 | p = ERR_PTR(-EFAULT); | |
230 | goto err; | |
231 | } | |
232 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); | |
233 | if (ret < 0) { | |
234 | p = ERR_PTR(ret); | |
235 | goto err; | |
236 | } | |
237 | return q; | |
238 | err: | |
8885cb36 | 239 | dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); |
1da177e4 LT |
240 | return p; |
241 | } | |
242 | ||
34769fc4 | 243 | #define UPCALL_BUF_LEN 128 |
1da177e4 LT |
244 | |
245 | struct gss_upcall_msg { | |
246 | atomic_t count; | |
247 | uid_t uid; | |
248 | struct rpc_pipe_msg msg; | |
249 | struct list_head list; | |
250 | struct gss_auth *auth; | |
5b7ddd4a | 251 | struct rpc_inode *inode; |
1da177e4 LT |
252 | struct rpc_wait_queue rpc_waitqueue; |
253 | wait_queue_head_t waitqueue; | |
254 | struct gss_cl_ctx *ctx; | |
34769fc4 | 255 | char databuf[UPCALL_BUF_LEN]; |
1da177e4 LT |
256 | }; |
257 | ||
79a3f20b BF |
258 | static int get_pipe_version(void) |
259 | { | |
260 | int ret; | |
261 | ||
262 | spin_lock(&pipe_version_lock); | |
263 | if (pipe_version >= 0) { | |
264 | atomic_inc(&pipe_users); | |
34769fc4 | 265 | ret = pipe_version; |
79a3f20b BF |
266 | } else |
267 | ret = -EAGAIN; | |
268 | spin_unlock(&pipe_version_lock); | |
269 | return ret; | |
270 | } | |
271 | ||
272 | static void put_pipe_version(void) | |
273 | { | |
274 | if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) { | |
275 | pipe_version = -1; | |
276 | spin_unlock(&pipe_version_lock); | |
277 | } | |
278 | } | |
279 | ||
1da177e4 LT |
280 | static void |
281 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
282 | { | |
283 | if (!atomic_dec_and_test(&gss_msg->count)) | |
284 | return; | |
79a3f20b | 285 | put_pipe_version(); |
1da177e4 LT |
286 | BUG_ON(!list_empty(&gss_msg->list)); |
287 | if (gss_msg->ctx != NULL) | |
288 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 289 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
1da177e4 LT |
290 | kfree(gss_msg); |
291 | } | |
292 | ||
293 | static struct gss_upcall_msg * | |
6e84c7b6 | 294 | __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) |
1da177e4 LT |
295 | { |
296 | struct gss_upcall_msg *pos; | |
6e84c7b6 | 297 | list_for_each_entry(pos, &rpci->in_downcall, list) { |
1da177e4 LT |
298 | if (pos->uid != uid) |
299 | continue; | |
300 | atomic_inc(&pos->count); | |
8885cb36 | 301 | dprintk("RPC: gss_find_upcall found msg %p\n", pos); |
1da177e4 LT |
302 | return pos; |
303 | } | |
8885cb36 | 304 | dprintk("RPC: gss_find_upcall found nothing\n"); |
1da177e4 LT |
305 | return NULL; |
306 | } | |
307 | ||
720b8f2d | 308 | /* Try to add an upcall to the pipefs queue. |
1da177e4 LT |
309 | * If an upcall owned by our uid already exists, then we return a reference |
310 | * to that upcall instead of adding the new upcall. | |
311 | */ | |
312 | static inline struct gss_upcall_msg * | |
053e324f | 313 | gss_add_msg(struct gss_upcall_msg *gss_msg) |
1da177e4 | 314 | { |
5b7ddd4a BF |
315 | struct rpc_inode *rpci = gss_msg->inode; |
316 | struct inode *inode = &rpci->vfs_inode; | |
1da177e4 LT |
317 | struct gss_upcall_msg *old; |
318 | ||
b185f835 | 319 | spin_lock(&inode->i_lock); |
6e84c7b6 | 320 | old = __gss_find_upcall(rpci, gss_msg->uid); |
1da177e4 LT |
321 | if (old == NULL) { |
322 | atomic_inc(&gss_msg->count); | |
6e84c7b6 | 323 | list_add(&gss_msg->list, &rpci->in_downcall); |
1da177e4 LT |
324 | } else |
325 | gss_msg = old; | |
b185f835 | 326 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
327 | return gss_msg; |
328 | } | |
329 | ||
330 | static void | |
331 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
332 | { | |
1da177e4 LT |
333 | list_del_init(&gss_msg->list); |
334 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
335 | wake_up_all(&gss_msg->waitqueue); | |
336 | atomic_dec(&gss_msg->count); | |
337 | } | |
338 | ||
339 | static void | |
340 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
341 | { | |
5b7ddd4a | 342 | struct inode *inode = &gss_msg->inode->vfs_inode; |
1da177e4 | 343 | |
3b68aaea TM |
344 | if (list_empty(&gss_msg->list)) |
345 | return; | |
b185f835 | 346 | spin_lock(&inode->i_lock); |
3b68aaea TM |
347 | if (!list_empty(&gss_msg->list)) |
348 | __gss_unhash_msg(gss_msg); | |
b185f835 | 349 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
350 | } |
351 | ||
352 | static void | |
353 | gss_upcall_callback(struct rpc_task *task) | |
354 | { | |
355 | struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, | |
356 | struct gss_cred, gc_base); | |
357 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
5b7ddd4a | 358 | struct inode *inode = &gss_msg->inode->vfs_inode; |
1da177e4 | 359 | |
5d28dc82 | 360 | spin_lock(&inode->i_lock); |
1da177e4 | 361 | if (gss_msg->ctx) |
7b6962b0 | 362 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); |
1da177e4 LT |
363 | else |
364 | task->tk_status = gss_msg->msg.errno; | |
1da177e4 LT |
365 | gss_cred->gc_upcall = NULL; |
366 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
b185f835 | 367 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
368 | gss_release_msg(gss_msg); |
369 | } | |
370 | ||
34769fc4 BF |
371 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) |
372 | { | |
373 | gss_msg->msg.data = &gss_msg->uid; | |
374 | gss_msg->msg.len = sizeof(gss_msg->uid); | |
375 | } | |
376 | ||
8b1c7bf5 | 377 | static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
2efef708 | 378 | struct rpc_clnt *clnt, int machine_cred) |
34769fc4 | 379 | { |
8b1c7bf5 OK |
380 | char *p = gss_msg->databuf; |
381 | int len = 0; | |
382 | ||
383 | gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ", | |
34769fc4 BF |
384 | gss_msg->auth->mech->gm_name, |
385 | gss_msg->uid); | |
8b1c7bf5 OK |
386 | p += gss_msg->msg.len; |
387 | if (clnt->cl_principal) { | |
388 | len = sprintf(p, "target=%s ", clnt->cl_principal); | |
389 | p += len; | |
390 | gss_msg->msg.len += len; | |
391 | } | |
2efef708 OK |
392 | if (machine_cred) { |
393 | len = sprintf(p, "service=* "); | |
394 | p += len; | |
395 | gss_msg->msg.len += len; | |
396 | } else if (!strcmp(clnt->cl_program->name, "nfs4_cb")) { | |
397 | len = sprintf(p, "service=nfs "); | |
398 | p += len; | |
399 | gss_msg->msg.len += len; | |
400 | } | |
8b1c7bf5 OK |
401 | len = sprintf(p, "\n"); |
402 | gss_msg->msg.len += len; | |
403 | ||
34769fc4 BF |
404 | gss_msg->msg.data = gss_msg->databuf; |
405 | BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN); | |
406 | } | |
407 | ||
8b1c7bf5 | 408 | static void gss_encode_msg(struct gss_upcall_msg *gss_msg, |
2efef708 | 409 | struct rpc_clnt *clnt, int machine_cred) |
34769fc4 BF |
410 | { |
411 | if (pipe_version == 0) | |
412 | gss_encode_v0_msg(gss_msg); | |
413 | else /* pipe_version == 1 */ | |
2efef708 | 414 | gss_encode_v1_msg(gss_msg, clnt, machine_cred); |
34769fc4 BF |
415 | } |
416 | ||
1da177e4 | 417 | static inline struct gss_upcall_msg * |
2efef708 OK |
418 | gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid, struct rpc_clnt *clnt, |
419 | int machine_cred) | |
1da177e4 LT |
420 | { |
421 | struct gss_upcall_msg *gss_msg; | |
79a3f20b | 422 | int vers; |
1da177e4 | 423 | |
0f38b873 | 424 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
db75b3d6 BF |
425 | if (gss_msg == NULL) |
426 | return ERR_PTR(-ENOMEM); | |
79a3f20b BF |
427 | vers = get_pipe_version(); |
428 | if (vers < 0) { | |
429 | kfree(gss_msg); | |
430 | return ERR_PTR(vers); | |
431 | } | |
34769fc4 | 432 | gss_msg->inode = RPC_I(gss_auth->dentry[vers]->d_inode); |
db75b3d6 BF |
433 | INIT_LIST_HEAD(&gss_msg->list); |
434 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
435 | init_waitqueue_head(&gss_msg->waitqueue); | |
436 | atomic_set(&gss_msg->count, 1); | |
db75b3d6 BF |
437 | gss_msg->uid = uid; |
438 | gss_msg->auth = gss_auth; | |
2efef708 | 439 | gss_encode_msg(gss_msg, clnt, machine_cred); |
1da177e4 LT |
440 | return gss_msg; |
441 | } | |
442 | ||
443 | static struct gss_upcall_msg * | |
444 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
445 | { | |
7c67db3a TM |
446 | struct gss_cred *gss_cred = container_of(cred, |
447 | struct gss_cred, gc_base); | |
1da177e4 | 448 | struct gss_upcall_msg *gss_new, *gss_msg; |
7c67db3a | 449 | uid_t uid = cred->cr_uid; |
1da177e4 | 450 | |
2efef708 | 451 | gss_new = gss_alloc_msg(gss_auth, uid, clnt, gss_cred->gc_machine_cred); |
db75b3d6 BF |
452 | if (IS_ERR(gss_new)) |
453 | return gss_new; | |
053e324f | 454 | gss_msg = gss_add_msg(gss_new); |
1da177e4 | 455 | if (gss_msg == gss_new) { |
5b7ddd4a BF |
456 | struct inode *inode = &gss_new->inode->vfs_inode; |
457 | int res = rpc_queue_upcall(inode, &gss_new->msg); | |
1da177e4 LT |
458 | if (res) { |
459 | gss_unhash_msg(gss_new); | |
460 | gss_msg = ERR_PTR(res); | |
461 | } | |
462 | } else | |
463 | gss_release_msg(gss_new); | |
464 | return gss_msg; | |
465 | } | |
466 | ||
b03568c3 BF |
467 | static void warn_gssd(void) |
468 | { | |
469 | static unsigned long ratelimit; | |
470 | unsigned long now = jiffies; | |
471 | ||
472 | if (time_after(now, ratelimit)) { | |
473 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" | |
474 | "Please check user daemon is running.\n"); | |
475 | ratelimit = now + 15*HZ; | |
476 | } | |
477 | } | |
478 | ||
1da177e4 LT |
479 | static inline int |
480 | gss_refresh_upcall(struct rpc_task *task) | |
481 | { | |
482 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
4a8c1344 | 483 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
484 | struct gss_auth, rpc_auth); |
485 | struct gss_cred *gss_cred = container_of(cred, | |
486 | struct gss_cred, gc_base); | |
487 | struct gss_upcall_msg *gss_msg; | |
5b7ddd4a | 488 | struct inode *inode; |
1da177e4 LT |
489 | int err = 0; |
490 | ||
8885cb36 CL |
491 | dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, |
492 | cred->cr_uid); | |
1da177e4 | 493 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
480e3243 | 494 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
79a3f20b BF |
495 | /* XXX: warning on the first, under the assumption we |
496 | * shouldn't normally hit this case on a refresh. */ | |
497 | warn_gssd(); | |
498 | task->tk_timeout = 15*HZ; | |
499 | rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); | |
500 | return 0; | |
501 | } | |
1da177e4 LT |
502 | if (IS_ERR(gss_msg)) { |
503 | err = PTR_ERR(gss_msg); | |
504 | goto out; | |
505 | } | |
5b7ddd4a | 506 | inode = &gss_msg->inode->vfs_inode; |
b185f835 | 507 | spin_lock(&inode->i_lock); |
1da177e4 | 508 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 509 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
7b6962b0 TM |
510 | else if (gss_msg->ctx != NULL) { |
511 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); | |
512 | gss_cred->gc_upcall = NULL; | |
513 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
514 | } else if (gss_msg->msg.errno >= 0) { | |
1da177e4 LT |
515 | task->tk_timeout = 0; |
516 | gss_cred->gc_upcall = gss_msg; | |
517 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
518 | atomic_inc(&gss_msg->count); | |
5d00837b | 519 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
1da177e4 LT |
520 | } else |
521 | err = gss_msg->msg.errno; | |
b185f835 | 522 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
523 | gss_release_msg(gss_msg); |
524 | out: | |
8885cb36 CL |
525 | dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", |
526 | task->tk_pid, cred->cr_uid, err); | |
1da177e4 LT |
527 | return err; |
528 | } | |
529 | ||
530 | static inline int | |
531 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
532 | { | |
5b7ddd4a | 533 | struct inode *inode; |
1da177e4 LT |
534 | struct rpc_cred *cred = &gss_cred->gc_base; |
535 | struct gss_upcall_msg *gss_msg; | |
536 | DEFINE_WAIT(wait); | |
537 | int err = 0; | |
538 | ||
8885cb36 | 539 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); |
79a3f20b | 540 | retry: |
1da177e4 | 541 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
79a3f20b BF |
542 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
543 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, | |
544 | pipe_version >= 0, 15*HZ); | |
545 | if (err) | |
546 | goto out; | |
547 | if (pipe_version < 0) | |
548 | warn_gssd(); | |
549 | goto retry; | |
550 | } | |
1da177e4 LT |
551 | if (IS_ERR(gss_msg)) { |
552 | err = PTR_ERR(gss_msg); | |
553 | goto out; | |
554 | } | |
5b7ddd4a | 555 | inode = &gss_msg->inode->vfs_inode; |
1da177e4 LT |
556 | for (;;) { |
557 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); | |
b185f835 | 558 | spin_lock(&inode->i_lock); |
1da177e4 | 559 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
560 | break; |
561 | } | |
b185f835 | 562 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
563 | if (signalled()) { |
564 | err = -ERESTARTSYS; | |
565 | goto out_intr; | |
566 | } | |
567 | schedule(); | |
568 | } | |
569 | if (gss_msg->ctx) | |
7b6962b0 | 570 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
571 | else |
572 | err = gss_msg->msg.errno; | |
5d28dc82 | 573 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
574 | out_intr: |
575 | finish_wait(&gss_msg->waitqueue, &wait); | |
576 | gss_release_msg(gss_msg); | |
577 | out: | |
8885cb36 CL |
578 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", |
579 | cred->cr_uid, err); | |
1da177e4 LT |
580 | return err; |
581 | } | |
582 | ||
583 | static ssize_t | |
584 | gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, | |
585 | char __user *dst, size_t buflen) | |
586 | { | |
587 | char *data = (char *)msg->data + msg->copied; | |
7df08995 CL |
588 | size_t mlen = min(msg->len, buflen); |
589 | unsigned long left; | |
1da177e4 | 590 | |
1da177e4 | 591 | left = copy_to_user(dst, data, mlen); |
7df08995 CL |
592 | if (left == mlen) { |
593 | msg->errno = -EFAULT; | |
594 | return -EFAULT; | |
1da177e4 | 595 | } |
7df08995 | 596 | |
1da177e4 LT |
597 | mlen -= left; |
598 | msg->copied += mlen; | |
599 | msg->errno = 0; | |
600 | return mlen; | |
601 | } | |
602 | ||
603 | #define MSG_BUF_MAXSIZE 1024 | |
604 | ||
605 | static ssize_t | |
606 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
607 | { | |
608 | const void *p, *end; | |
609 | void *buf; | |
1da177e4 | 610 | struct gss_upcall_msg *gss_msg; |
b185f835 | 611 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
612 | struct gss_cl_ctx *ctx; |
613 | uid_t uid; | |
3b68aaea | 614 | ssize_t err = -EFBIG; |
1da177e4 LT |
615 | |
616 | if (mlen > MSG_BUF_MAXSIZE) | |
617 | goto out; | |
618 | err = -ENOMEM; | |
0f38b873 | 619 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
620 | if (!buf) |
621 | goto out; | |
622 | ||
1da177e4 LT |
623 | err = -EFAULT; |
624 | if (copy_from_user(buf, src, mlen)) | |
625 | goto err; | |
626 | ||
627 | end = (const void *)((char *)buf + mlen); | |
628 | p = simple_get_bytes(buf, end, &uid, sizeof(uid)); | |
629 | if (IS_ERR(p)) { | |
630 | err = PTR_ERR(p); | |
631 | goto err; | |
632 | } | |
633 | ||
634 | err = -ENOMEM; | |
635 | ctx = gss_alloc_context(); | |
636 | if (ctx == NULL) | |
637 | goto err; | |
3b68aaea TM |
638 | |
639 | err = -ENOENT; | |
640 | /* Find a matching upcall */ | |
3b68aaea | 641 | spin_lock(&inode->i_lock); |
6e84c7b6 | 642 | gss_msg = __gss_find_upcall(RPC_I(inode), uid); |
3b68aaea TM |
643 | if (gss_msg == NULL) { |
644 | spin_unlock(&inode->i_lock); | |
645 | goto err_put_ctx; | |
646 | } | |
647 | list_del_init(&gss_msg->list); | |
648 | spin_unlock(&inode->i_lock); | |
649 | ||
6e84c7b6 | 650 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
651 | if (IS_ERR(p)) { |
652 | err = PTR_ERR(p); | |
486bad2e JL |
653 | switch (err) { |
654 | case -EACCES: | |
dc5ddce9 | 655 | case -EKEYEXPIRED: |
486bad2e JL |
656 | gss_msg->msg.errno = err; |
657 | err = mlen; | |
658 | break; | |
659 | case -EFAULT: | |
660 | case -ENOMEM: | |
661 | case -EINVAL: | |
662 | case -ENOSYS: | |
663 | gss_msg->msg.errno = -EAGAIN; | |
664 | break; | |
665 | default: | |
666 | printk(KERN_CRIT "%s: bad return from " | |
6c853099 | 667 | "gss_fill_context: %zd\n", __func__, err); |
486bad2e JL |
668 | BUG(); |
669 | } | |
3b68aaea | 670 | goto err_release_msg; |
1da177e4 | 671 | } |
3b68aaea TM |
672 | gss_msg->ctx = gss_get_ctx(ctx); |
673 | err = mlen; | |
674 | ||
675 | err_release_msg: | |
b185f835 | 676 | spin_lock(&inode->i_lock); |
3b68aaea TM |
677 | __gss_unhash_msg(gss_msg); |
678 | spin_unlock(&inode->i_lock); | |
679 | gss_release_msg(gss_msg); | |
1da177e4 LT |
680 | err_put_ctx: |
681 | gss_put_ctx(ctx); | |
682 | err: | |
683 | kfree(buf); | |
684 | out: | |
3b68aaea | 685 | dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); |
1da177e4 LT |
686 | return err; |
687 | } | |
688 | ||
34769fc4 | 689 | static int gss_pipe_open(struct inode *inode, int new_version) |
cf81939d | 690 | { |
34769fc4 BF |
691 | int ret = 0; |
692 | ||
79a3f20b BF |
693 | spin_lock(&pipe_version_lock); |
694 | if (pipe_version < 0) { | |
34769fc4 BF |
695 | /* First open of any gss pipe determines the version: */ |
696 | pipe_version = new_version; | |
79a3f20b BF |
697 | rpc_wake_up(&pipe_version_rpc_waitqueue); |
698 | wake_up(&pipe_version_waitqueue); | |
34769fc4 BF |
699 | } else if (pipe_version != new_version) { |
700 | /* Trying to open a pipe of a different version */ | |
701 | ret = -EBUSY; | |
702 | goto out; | |
79a3f20b | 703 | } |
cf81939d | 704 | atomic_inc(&pipe_users); |
34769fc4 | 705 | out: |
79a3f20b | 706 | spin_unlock(&pipe_version_lock); |
34769fc4 BF |
707 | return ret; |
708 | ||
709 | } | |
710 | ||
711 | static int gss_pipe_open_v0(struct inode *inode) | |
712 | { | |
713 | return gss_pipe_open(inode, 0); | |
714 | } | |
715 | ||
716 | static int gss_pipe_open_v1(struct inode *inode) | |
717 | { | |
718 | return gss_pipe_open(inode, 1); | |
cf81939d BF |
719 | } |
720 | ||
1da177e4 LT |
721 | static void |
722 | gss_pipe_release(struct inode *inode) | |
723 | { | |
724 | struct rpc_inode *rpci = RPC_I(inode); | |
6e84c7b6 | 725 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 726 | |
b185f835 | 727 | spin_lock(&inode->i_lock); |
6e84c7b6 | 728 | while (!list_empty(&rpci->in_downcall)) { |
1da177e4 | 729 | |
6e84c7b6 | 730 | gss_msg = list_entry(rpci->in_downcall.next, |
1da177e4 LT |
731 | struct gss_upcall_msg, list); |
732 | gss_msg->msg.errno = -EPIPE; | |
733 | atomic_inc(&gss_msg->count); | |
734 | __gss_unhash_msg(gss_msg); | |
b185f835 | 735 | spin_unlock(&inode->i_lock); |
1da177e4 | 736 | gss_release_msg(gss_msg); |
b185f835 | 737 | spin_lock(&inode->i_lock); |
1da177e4 | 738 | } |
b185f835 | 739 | spin_unlock(&inode->i_lock); |
cf81939d | 740 | |
79a3f20b | 741 | put_pipe_version(); |
1da177e4 LT |
742 | } |
743 | ||
744 | static void | |
745 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
746 | { | |
747 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
1da177e4 LT |
748 | |
749 | if (msg->errno < 0) { | |
8885cb36 | 750 | dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", |
1da177e4 LT |
751 | gss_msg); |
752 | atomic_inc(&gss_msg->count); | |
753 | gss_unhash_msg(gss_msg); | |
b03568c3 BF |
754 | if (msg->errno == -ETIMEDOUT) |
755 | warn_gssd(); | |
1da177e4 LT |
756 | gss_release_msg(gss_msg); |
757 | } | |
758 | } | |
759 | ||
cca5172a YH |
760 | /* |
761 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
762 | * parameters based on the input flavor (which must be a pseudoflavor) |
763 | */ | |
764 | static struct rpc_auth * | |
765 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
766 | { | |
767 | struct gss_auth *gss_auth; | |
768 | struct rpc_auth * auth; | |
6a19275a | 769 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 770 | |
8885cb36 | 771 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
772 | |
773 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 774 | return ERR_PTR(err); |
1da177e4 LT |
775 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
776 | goto out_dec; | |
777 | gss_auth->client = clnt; | |
6a19275a | 778 | err = -EINVAL; |
1da177e4 LT |
779 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
780 | if (!gss_auth->mech) { | |
3392c349 | 781 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", |
0dc47877 | 782 | __func__, flavor); |
1da177e4 LT |
783 | goto err_free; |
784 | } | |
785 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
786 | if (gss_auth->service == 0) |
787 | goto err_put_mech; | |
1da177e4 LT |
788 | auth = &gss_auth->rpc_auth; |
789 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
790 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
791 | auth->au_ops = &authgss_ops; | |
792 | auth->au_flavor = flavor; | |
793 | atomic_set(&auth->au_count, 1); | |
0285ed1f | 794 | kref_init(&gss_auth->kref); |
1da177e4 | 795 | |
34769fc4 BF |
796 | /* |
797 | * Note: if we created the old pipe first, then someone who | |
798 | * examined the directory at the right moment might conclude | |
799 | * that we supported only the old pipe. So we instead create | |
800 | * the new pipe first. | |
801 | */ | |
7d217cac | 802 | gss_auth->dentry[1] = rpc_mkpipe(clnt->cl_path.dentry, |
34769fc4 BF |
803 | "gssd", |
804 | clnt, &gss_upcall_ops_v1, | |
805 | RPC_PIPE_WAIT_FOR_OPEN); | |
806 | if (IS_ERR(gss_auth->dentry[1])) { | |
807 | err = PTR_ERR(gss_auth->dentry[1]); | |
1da177e4 | 808 | goto err_put_mech; |
6a19275a | 809 | } |
1da177e4 | 810 | |
7d217cac | 811 | gss_auth->dentry[0] = rpc_mkpipe(clnt->cl_path.dentry, |
34769fc4 BF |
812 | gss_auth->mech->gm_name, |
813 | clnt, &gss_upcall_ops_v0, | |
814 | RPC_PIPE_WAIT_FOR_OPEN); | |
815 | if (IS_ERR(gss_auth->dentry[0])) { | |
816 | err = PTR_ERR(gss_auth->dentry[0]); | |
817 | goto err_unlink_pipe_1; | |
818 | } | |
f5c2187c | 819 | err = rpcauth_init_credcache(auth); |
07a2bf1d | 820 | if (err) |
34769fc4 | 821 | goto err_unlink_pipe_0; |
07a2bf1d | 822 | |
1da177e4 | 823 | return auth; |
34769fc4 BF |
824 | err_unlink_pipe_0: |
825 | rpc_unlink(gss_auth->dentry[0]); | |
826 | err_unlink_pipe_1: | |
827 | rpc_unlink(gss_auth->dentry[1]); | |
1da177e4 LT |
828 | err_put_mech: |
829 | gss_mech_put(gss_auth->mech); | |
830 | err_free: | |
831 | kfree(gss_auth); | |
832 | out_dec: | |
833 | module_put(THIS_MODULE); | |
6a19275a | 834 | return ERR_PTR(err); |
1da177e4 LT |
835 | } |
836 | ||
0285ed1f TM |
837 | static void |
838 | gss_free(struct gss_auth *gss_auth) | |
839 | { | |
34769fc4 BF |
840 | rpc_unlink(gss_auth->dentry[1]); |
841 | rpc_unlink(gss_auth->dentry[0]); | |
0285ed1f TM |
842 | gss_mech_put(gss_auth->mech); |
843 | ||
844 | kfree(gss_auth); | |
845 | module_put(THIS_MODULE); | |
846 | } | |
847 | ||
848 | static void | |
849 | gss_free_callback(struct kref *kref) | |
850 | { | |
851 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
852 | ||
853 | gss_free(gss_auth); | |
854 | } | |
855 | ||
1da177e4 LT |
856 | static void |
857 | gss_destroy(struct rpc_auth *auth) | |
858 | { | |
859 | struct gss_auth *gss_auth; | |
860 | ||
8885cb36 CL |
861 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
862 | auth, auth->au_flavor); | |
1da177e4 | 863 | |
3ab9bb72 TM |
864 | rpcauth_destroy_credcache(auth); |
865 | ||
1da177e4 | 866 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
0285ed1f | 867 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
868 | } |
869 | ||
0df7fb74 TM |
870 | /* |
871 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
872 | * to the server with the GSS control procedure field set to | |
873 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
874 | * all RPCSEC_GSS state associated with that context. | |
875 | */ | |
876 | static int | |
877 | gss_destroying_context(struct rpc_cred *cred) | |
878 | { | |
879 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
880 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
881 | struct rpc_task *task; | |
882 | ||
883 | if (gss_cred->gc_ctx == NULL || | |
6dcd3926 | 884 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
0df7fb74 TM |
885 | return 0; |
886 | ||
887 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
888 | cred->cr_ops = &gss_nullops; | |
889 | ||
890 | /* Take a reference to ensure the cred will be destroyed either | |
891 | * by the RPC call or by the put_rpccred() below */ | |
892 | get_rpccred(cred); | |
893 | ||
080a1f14 | 894 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
0df7fb74 TM |
895 | if (!IS_ERR(task)) |
896 | rpc_put_task(task); | |
897 | ||
898 | put_rpccred(cred); | |
899 | return 1; | |
900 | } | |
901 | ||
902 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
903 | * to create a new cred or context, so they check that things have been |
904 | * allocated before freeing them. */ | |
905 | static void | |
5d28dc82 | 906 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 907 | { |
5d28dc82 | 908 | dprintk("RPC: gss_free_ctx\n"); |
1da177e4 | 909 | |
1da177e4 LT |
910 | kfree(ctx->gc_wire_ctx.data); |
911 | kfree(ctx); | |
912 | } | |
913 | ||
5d28dc82 TM |
914 | static void |
915 | gss_free_ctx_callback(struct rcu_head *head) | |
916 | { | |
917 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
918 | gss_do_free_ctx(ctx); | |
919 | } | |
920 | ||
921 | static void | |
922 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
923 | { | |
a4deb81b TM |
924 | struct gss_ctx *gc_gss_ctx; |
925 | ||
926 | gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); | |
927 | rcu_assign_pointer(ctx->gc_gss_ctx, NULL); | |
5d28dc82 | 928 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); |
a4deb81b TM |
929 | if (gc_gss_ctx) |
930 | gss_delete_sec_context(&gc_gss_ctx); | |
5d28dc82 TM |
931 | } |
932 | ||
1da177e4 | 933 | static void |
31be5bf1 | 934 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 935 | { |
31be5bf1 | 936 | dprintk("RPC: gss_free_cred %p\n", gss_cred); |
31be5bf1 TM |
937 | kfree(gss_cred); |
938 | } | |
1da177e4 | 939 | |
31be5bf1 TM |
940 | static void |
941 | gss_free_cred_callback(struct rcu_head *head) | |
942 | { | |
943 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
944 | gss_free_cred(gss_cred); | |
945 | } | |
1da177e4 | 946 | |
31be5bf1 | 947 | static void |
6dcd3926 | 948 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 949 | { |
5d28dc82 | 950 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 951 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
5d28dc82 TM |
952 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
953 | ||
954 | rcu_assign_pointer(gss_cred->gc_ctx, NULL); | |
31be5bf1 | 955 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
956 | if (ctx) |
957 | gss_put_ctx(ctx); | |
0285ed1f | 958 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
959 | } |
960 | ||
6dcd3926 JL |
961 | static void |
962 | gss_destroy_cred(struct rpc_cred *cred) | |
963 | { | |
964 | ||
965 | if (gss_destroying_context(cred)) | |
966 | return; | |
967 | gss_destroy_nullcred(cred); | |
968 | } | |
969 | ||
1da177e4 LT |
970 | /* |
971 | * Lookup RPCSEC_GSS cred for the current process | |
972 | */ | |
973 | static struct rpc_cred * | |
8a317760 | 974 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 975 | { |
8a317760 | 976 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
977 | } |
978 | ||
979 | static struct rpc_cred * | |
8a317760 | 980 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
981 | { |
982 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
983 | struct gss_cred *cred = NULL; | |
984 | int err = -ENOMEM; | |
985 | ||
8885cb36 | 986 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", |
1da177e4 LT |
987 | acred->uid, auth->au_flavor); |
988 | ||
0f38b873 | 989 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
1da177e4 LT |
990 | goto out_err; |
991 | ||
5fe4755e | 992 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
993 | /* |
994 | * Note: in order to force a call to call_refresh(), we deliberately | |
995 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
996 | */ | |
fc432dd9 | 997 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 998 | cred->gc_service = gss_auth->service; |
7c67db3a | 999 | cred->gc_machine_cred = acred->machine_cred; |
0285ed1f | 1000 | kref_get(&gss_auth->kref); |
1da177e4 LT |
1001 | return &cred->gc_base; |
1002 | ||
1003 | out_err: | |
8885cb36 | 1004 | dprintk("RPC: gss_create_cred failed with error %d\n", err); |
1da177e4 LT |
1005 | return ERR_PTR(err); |
1006 | } | |
1007 | ||
fba3bad4 TM |
1008 | static int |
1009 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
1010 | { | |
1011 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1012 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
1013 | int err; | |
1014 | ||
1015 | do { | |
1016 | err = gss_create_upcall(gss_auth, gss_cred); | |
1017 | } while (err == -EAGAIN); | |
1018 | return err; | |
1019 | } | |
1020 | ||
1da177e4 | 1021 | static int |
8a317760 | 1022 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
1023 | { |
1024 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
1025 | ||
cd019f75 | 1026 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 1027 | goto out; |
1da177e4 | 1028 | /* Don't match with creds that have expired. */ |
cd019f75 TM |
1029 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
1030 | return 0; | |
1031 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1da177e4 | 1032 | return 0; |
8a317760 | 1033 | out: |
7c67db3a TM |
1034 | if (acred->machine_cred != gss_cred->gc_machine_cred) |
1035 | return 0; | |
1da177e4 LT |
1036 | return (rc->cr_uid == acred->uid); |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * Marshal credentials. | |
1041 | * Maybe we should keep a cached credential for performance reasons. | |
1042 | */ | |
d8ed029d AD |
1043 | static __be32 * |
1044 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
1045 | { |
1046 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1047 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1048 | gc_base); | |
1049 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1050 | __be32 *cred_len; |
1da177e4 LT |
1051 | struct rpc_rqst *req = task->tk_rqstp; |
1052 | u32 maj_stat = 0; | |
1053 | struct xdr_netobj mic; | |
1054 | struct kvec iov; | |
1055 | struct xdr_buf verf_buf; | |
1056 | ||
8885cb36 | 1057 | dprintk("RPC: %5u gss_marshal\n", task->tk_pid); |
1da177e4 LT |
1058 | |
1059 | *p++ = htonl(RPC_AUTH_GSS); | |
1060 | cred_len = p++; | |
1061 | ||
1062 | spin_lock(&ctx->gc_seq_lock); | |
1063 | req->rq_seqno = ctx->gc_seq++; | |
1064 | spin_unlock(&ctx->gc_seq_lock); | |
1065 | ||
1066 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
1067 | *p++ = htonl((u32) ctx->gc_proc); | |
1068 | *p++ = htonl((u32) req->rq_seqno); | |
1069 | *p++ = htonl((u32) gss_cred->gc_service); | |
1070 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
1071 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
1072 | ||
1073 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
1074 | * starting with the xid and ending at the end of the credential: */ | |
808012fb CL |
1075 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
1076 | req->rq_snd_buf.head[0].iov_base); | |
1da177e4 LT |
1077 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
1078 | xdr_buf_from_iov(&iov, &verf_buf); | |
1079 | ||
1080 | /* set verifier flavor*/ | |
1081 | *p++ = htonl(RPC_AUTH_GSS); | |
1082 | ||
1083 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 1084 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1085 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 1086 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1087 | } else if (maj_stat != 0) { |
1088 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
1089 | goto out_put_ctx; | |
1090 | } | |
1091 | p = xdr_encode_opaque(p, NULL, mic.len); | |
1092 | gss_put_ctx(ctx); | |
1093 | return p; | |
1094 | out_put_ctx: | |
1095 | gss_put_ctx(ctx); | |
1096 | return NULL; | |
1097 | } | |
1098 | ||
cd019f75 TM |
1099 | static int gss_renew_cred(struct rpc_task *task) |
1100 | { | |
1101 | struct rpc_cred *oldcred = task->tk_msg.rpc_cred; | |
1102 | struct gss_cred *gss_cred = container_of(oldcred, | |
1103 | struct gss_cred, | |
1104 | gc_base); | |
1105 | struct rpc_auth *auth = oldcred->cr_auth; | |
1106 | struct auth_cred acred = { | |
1107 | .uid = oldcred->cr_uid, | |
1108 | .machine_cred = gss_cred->gc_machine_cred, | |
1109 | }; | |
1110 | struct rpc_cred *new; | |
1111 | ||
1112 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
1113 | if (IS_ERR(new)) | |
1114 | return PTR_ERR(new); | |
1115 | task->tk_msg.rpc_cred = new; | |
1116 | put_rpccred(oldcred); | |
1117 | return 0; | |
1118 | } | |
1119 | ||
1da177e4 LT |
1120 | /* |
1121 | * Refresh credentials. XXX - finish | |
1122 | */ | |
1123 | static int | |
1124 | gss_refresh(struct rpc_task *task) | |
1125 | { | |
cd019f75 TM |
1126 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
1127 | int ret = 0; | |
1128 | ||
1129 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && | |
1130 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
1131 | ret = gss_renew_cred(task); | |
1132 | if (ret < 0) | |
1133 | goto out; | |
1134 | cred = task->tk_msg.rpc_cred; | |
1135 | } | |
1da177e4 | 1136 | |
cd019f75 TM |
1137 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
1138 | ret = gss_refresh_upcall(task); | |
1139 | out: | |
1140 | return ret; | |
1da177e4 LT |
1141 | } |
1142 | ||
0df7fb74 TM |
1143 | /* Dummy refresh routine: used only when destroying the context */ |
1144 | static int | |
1145 | gss_refresh_null(struct rpc_task *task) | |
1146 | { | |
1147 | return -EACCES; | |
1148 | } | |
1149 | ||
d8ed029d AD |
1150 | static __be32 * |
1151 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 LT |
1152 | { |
1153 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1da177e4 | 1154 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 1155 | __be32 seq; |
1da177e4 LT |
1156 | struct kvec iov; |
1157 | struct xdr_buf verf_buf; | |
1158 | struct xdr_netobj mic; | |
1159 | u32 flav,len; | |
1160 | u32 maj_stat; | |
1161 | ||
8885cb36 | 1162 | dprintk("RPC: %5u gss_validate\n", task->tk_pid); |
1da177e4 LT |
1163 | |
1164 | flav = ntohl(*p++); | |
1165 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 1166 | goto out_bad; |
1da177e4 LT |
1167 | if (flav != RPC_AUTH_GSS) |
1168 | goto out_bad; | |
1169 | seq = htonl(task->tk_rqstp->rq_seqno); | |
1170 | iov.iov_base = &seq; | |
1171 | iov.iov_len = sizeof(seq); | |
1172 | xdr_buf_from_iov(&iov, &verf_buf); | |
1173 | mic.data = (u8 *)p; | |
1174 | mic.len = len; | |
1175 | ||
00fd6e14 | 1176 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1177 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1178 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 1179 | if (maj_stat) { |
014313a9 | 1180 | dprintk("RPC: %5u gss_validate: gss_verify_mic returned " |
0df7fb74 | 1181 | "error 0x%08x\n", task->tk_pid, maj_stat); |
1da177e4 | 1182 | goto out_bad; |
0df7fb74 | 1183 | } |
24b2605b BF |
1184 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1185 | * calculate the length of the verifier: */ | |
1be27f36 | 1186 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 1187 | gss_put_ctx(ctx); |
8885cb36 | 1188 | dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", |
1da177e4 LT |
1189 | task->tk_pid); |
1190 | return p + XDR_QUADLEN(len); | |
1191 | out_bad: | |
1192 | gss_put_ctx(ctx); | |
8885cb36 | 1193 | dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); |
1da177e4 LT |
1194 | return NULL; |
1195 | } | |
1196 | ||
1197 | static inline int | |
1198 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1199 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1200 | { |
1201 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1202 | struct xdr_buf integ_buf; | |
d8ed029d | 1203 | __be32 *integ_len = NULL; |
1da177e4 | 1204 | struct xdr_netobj mic; |
d8ed029d AD |
1205 | u32 offset; |
1206 | __be32 *q; | |
1da177e4 LT |
1207 | struct kvec *iov; |
1208 | u32 maj_stat = 0; | |
1209 | int status = -EIO; | |
1210 | ||
1211 | integ_len = p++; | |
1212 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1213 | *p++ = htonl(rqstp->rq_seqno); | |
1214 | ||
88a9fe8c | 1215 | status = encode(rqstp, p, obj); |
1da177e4 LT |
1216 | if (status) |
1217 | return status; | |
1218 | ||
1219 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1220 | offset, snd_buf->len - offset)) | |
1221 | return status; | |
1222 | *integ_len = htonl(integ_buf.len); | |
1223 | ||
1224 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1225 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1226 | iov = snd_buf->tail; |
1227 | else | |
1228 | iov = snd_buf->head; | |
1229 | p = iov->iov_base + iov->iov_len; | |
1230 | mic.data = (u8 *)(p + 1); | |
1231 | ||
00fd6e14 | 1232 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1233 | status = -EIO; /* XXX? */ |
1234 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1235 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1236 | else if (maj_stat) |
1237 | return status; | |
1238 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1239 | ||
1240 | offset = (u8 *)q - (u8 *)p; | |
1241 | iov->iov_len += offset; | |
1242 | snd_buf->len += offset; | |
1243 | return 0; | |
1244 | } | |
1245 | ||
2d2da60c BF |
1246 | static void |
1247 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1248 | { | |
1249 | int i; | |
1250 | ||
1251 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1252 | __free_page(rqstp->rq_enc_pages[i]); | |
1253 | kfree(rqstp->rq_enc_pages); | |
1254 | } | |
1255 | ||
1256 | static int | |
1257 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1258 | { | |
1259 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1260 | int first, last, i; | |
1261 | ||
1262 | if (snd_buf->page_len == 0) { | |
1263 | rqstp->rq_enc_pages_num = 0; | |
1264 | return 0; | |
1265 | } | |
1266 | ||
1267 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1268 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1269 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1270 | rqstp->rq_enc_pages | |
1271 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1272 | GFP_NOFS); | |
1273 | if (!rqstp->rq_enc_pages) | |
1274 | goto out; | |
1275 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1276 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1277 | if (rqstp->rq_enc_pages[i] == NULL) | |
1278 | goto out_free; | |
1279 | } | |
1280 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1281 | return 0; | |
1282 | out_free: | |
1283 | for (i--; i >= 0; i--) { | |
1284 | __free_page(rqstp->rq_enc_pages[i]); | |
1285 | } | |
1286 | out: | |
1287 | return -EAGAIN; | |
1288 | } | |
1289 | ||
1290 | static inline int | |
1291 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1292 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
2d2da60c BF |
1293 | { |
1294 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1295 | u32 offset; | |
1296 | u32 maj_stat; | |
1297 | int status; | |
d8ed029d | 1298 | __be32 *opaque_len; |
2d2da60c BF |
1299 | struct page **inpages; |
1300 | int first; | |
1301 | int pad; | |
1302 | struct kvec *iov; | |
1303 | char *tmp; | |
1304 | ||
1305 | opaque_len = p++; | |
1306 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1307 | *p++ = htonl(rqstp->rq_seqno); | |
1308 | ||
88a9fe8c | 1309 | status = encode(rqstp, p, obj); |
2d2da60c BF |
1310 | if (status) |
1311 | return status; | |
1312 | ||
1313 | status = alloc_enc_pages(rqstp); | |
1314 | if (status) | |
1315 | return status; | |
1316 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1317 | inpages = snd_buf->pages + first; | |
1318 | snd_buf->pages = rqstp->rq_enc_pages; | |
1319 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
1320 | /* Give the tail its own page, in case we need extra space in the | |
1321 | * head when wrapping: */ | |
1322 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { | |
1323 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1324 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1325 | snd_buf->tail[0].iov_base = tmp; | |
1326 | } | |
00fd6e14 | 1327 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
2d2da60c BF |
1328 | /* RPC_SLACK_SPACE should prevent this ever happening: */ |
1329 | BUG_ON(snd_buf->len > snd_buf->buflen); | |
cca5172a | 1330 | status = -EIO; |
2d2da60c BF |
1331 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1332 | * done anyway, so it's safe to put the request on the wire: */ | |
1333 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1334 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1335 | else if (maj_stat) |
1336 | return status; | |
1337 | ||
1338 | *opaque_len = htonl(snd_buf->len - offset); | |
1339 | /* guess whether we're in the head or the tail: */ | |
1340 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1341 | iov = snd_buf->tail; | |
1342 | else | |
1343 | iov = snd_buf->head; | |
1344 | p = iov->iov_base + iov->iov_len; | |
1345 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1346 | memset(p, 0, pad); | |
1347 | iov->iov_len += pad; | |
1348 | snd_buf->len += pad; | |
1349 | ||
1350 | return 0; | |
1351 | } | |
1352 | ||
1da177e4 LT |
1353 | static int |
1354 | gss_wrap_req(struct rpc_task *task, | |
d8ed029d | 1355 | kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1356 | { |
1357 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1358 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1359 | gc_base); | |
1360 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1361 | int status = -EIO; | |
1362 | ||
8885cb36 | 1363 | dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); |
1da177e4 LT |
1364 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1365 | /* The spec seems a little ambiguous here, but I think that not | |
1366 | * wrapping context destruction requests makes the most sense. | |
1367 | */ | |
88a9fe8c | 1368 | status = encode(rqstp, p, obj); |
1da177e4 LT |
1369 | goto out; |
1370 | } | |
1371 | switch (gss_cred->gc_service) { | |
1372 | case RPC_GSS_SVC_NONE: | |
88a9fe8c | 1373 | status = encode(rqstp, p, obj); |
1da177e4 LT |
1374 | break; |
1375 | case RPC_GSS_SVC_INTEGRITY: | |
1376 | status = gss_wrap_req_integ(cred, ctx, encode, | |
1377 | rqstp, p, obj); | |
1378 | break; | |
cca5172a | 1379 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1380 | status = gss_wrap_req_priv(cred, ctx, encode, |
1381 | rqstp, p, obj); | |
1da177e4 LT |
1382 | break; |
1383 | } | |
1384 | out: | |
1385 | gss_put_ctx(ctx); | |
8885cb36 | 1386 | dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); |
1da177e4 LT |
1387 | return status; |
1388 | } | |
1389 | ||
1390 | static inline int | |
1391 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1392 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1393 | { |
1394 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1395 | struct xdr_buf integ_buf; | |
1396 | struct xdr_netobj mic; | |
1397 | u32 data_offset, mic_offset; | |
1398 | u32 integ_len; | |
1399 | u32 maj_stat; | |
1400 | int status = -EIO; | |
1401 | ||
1402 | integ_len = ntohl(*(*p)++); | |
1403 | if (integ_len & 3) | |
1404 | return status; | |
1405 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1406 | mic_offset = integ_len + data_offset; | |
1407 | if (mic_offset > rcv_buf->len) | |
1408 | return status; | |
1409 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1410 | return status; | |
1411 | ||
1412 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1413 | mic_offset - data_offset)) | |
1414 | return status; | |
1415 | ||
1416 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1417 | return status; | |
1418 | ||
00fd6e14 | 1419 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1420 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1421 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1422 | if (maj_stat != GSS_S_COMPLETE) |
1423 | return status; | |
1424 | return 0; | |
1425 | } | |
1426 | ||
2d2da60c BF |
1427 | static inline int |
1428 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1429 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1430 | { |
1431 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1432 | u32 offset; | |
1433 | u32 opaque_len; | |
1434 | u32 maj_stat; | |
1435 | int status = -EIO; | |
1436 | ||
1437 | opaque_len = ntohl(*(*p)++); | |
1438 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1439 | if (offset + opaque_len > rcv_buf->len) | |
1440 | return status; | |
1441 | /* remove padding: */ | |
1442 | rcv_buf->len = offset + opaque_len; | |
1443 | ||
00fd6e14 | 1444 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1445 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1446 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1447 | if (maj_stat != GSS_S_COMPLETE) |
1448 | return status; | |
1449 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1450 | return status; | |
1451 | ||
1452 | return 0; | |
1453 | } | |
1454 | ||
1455 | ||
1da177e4 LT |
1456 | static int |
1457 | gss_unwrap_resp(struct rpc_task *task, | |
d8ed029d | 1458 | kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 LT |
1459 | { |
1460 | struct rpc_cred *cred = task->tk_msg.rpc_cred; | |
1461 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, | |
1462 | gc_base); | |
1463 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1464 | __be32 *savedp = p; |
2d2da60c BF |
1465 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1466 | int savedlen = head->iov_len; | |
1da177e4 LT |
1467 | int status = -EIO; |
1468 | ||
1469 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1470 | goto out_decode; | |
1471 | switch (gss_cred->gc_service) { | |
1472 | case RPC_GSS_SVC_NONE: | |
1473 | break; | |
1474 | case RPC_GSS_SVC_INTEGRITY: | |
1475 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1476 | if (status) | |
1477 | goto out; | |
1478 | break; | |
cca5172a | 1479 | case RPC_GSS_SVC_PRIVACY: |
2d2da60c BF |
1480 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); |
1481 | if (status) | |
1482 | goto out; | |
1da177e4 LT |
1483 | break; |
1484 | } | |
24b2605b | 1485 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 1486 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 1487 | + (savedlen - head->iov_len); |
1da177e4 | 1488 | out_decode: |
88a9fe8c | 1489 | status = decode(rqstp, p, obj); |
1da177e4 LT |
1490 | out: |
1491 | gss_put_ctx(ctx); | |
8885cb36 | 1492 | dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, |
1da177e4 LT |
1493 | status); |
1494 | return status; | |
1495 | } | |
cca5172a | 1496 | |
f1c0a861 | 1497 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1498 | .owner = THIS_MODULE, |
1499 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 1500 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
1501 | .create = gss_create, |
1502 | .destroy = gss_destroy, | |
1503 | .lookup_cred = gss_lookup_cred, | |
1504 | .crcreate = gss_create_cred | |
1505 | }; | |
1506 | ||
f1c0a861 | 1507 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1508 | .cr_name = "AUTH_GSS", |
1509 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1510 | .cr_init = gss_cred_init, |
5c691044 | 1511 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
1512 | .crmatch = gss_match, |
1513 | .crmarshal = gss_marshal, | |
1514 | .crrefresh = gss_refresh, | |
1515 | .crvalidate = gss_validate, | |
1516 | .crwrap_req = gss_wrap_req, | |
1517 | .crunwrap_resp = gss_unwrap_resp, | |
1518 | }; | |
1519 | ||
0df7fb74 TM |
1520 | static const struct rpc_credops gss_nullops = { |
1521 | .cr_name = "AUTH_GSS", | |
6dcd3926 | 1522 | .crdestroy = gss_destroy_nullcred, |
5c691044 | 1523 | .crbind = rpcauth_generic_bind_cred, |
0df7fb74 TM |
1524 | .crmatch = gss_match, |
1525 | .crmarshal = gss_marshal, | |
1526 | .crrefresh = gss_refresh_null, | |
1527 | .crvalidate = gss_validate, | |
1528 | .crwrap_req = gss_wrap_req, | |
1529 | .crunwrap_resp = gss_unwrap_resp, | |
1530 | }; | |
1531 | ||
b693ba4a | 1532 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
34769fc4 BF |
1533 | .upcall = gss_pipe_upcall, |
1534 | .downcall = gss_pipe_downcall, | |
1535 | .destroy_msg = gss_pipe_destroy_msg, | |
1536 | .open_pipe = gss_pipe_open_v0, | |
1537 | .release_pipe = gss_pipe_release, | |
1538 | }; | |
1539 | ||
b693ba4a | 1540 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
1da177e4 LT |
1541 | .upcall = gss_pipe_upcall, |
1542 | .downcall = gss_pipe_downcall, | |
1543 | .destroy_msg = gss_pipe_destroy_msg, | |
34769fc4 | 1544 | .open_pipe = gss_pipe_open_v1, |
1da177e4 LT |
1545 | .release_pipe = gss_pipe_release, |
1546 | }; | |
1547 | ||
1548 | /* | |
1549 | * Initialize RPCSEC_GSS module | |
1550 | */ | |
1551 | static int __init init_rpcsec_gss(void) | |
1552 | { | |
1553 | int err = 0; | |
1554 | ||
1555 | err = rpcauth_register(&authgss_ops); | |
1556 | if (err) | |
1557 | goto out; | |
1558 | err = gss_svc_init(); | |
1559 | if (err) | |
1560 | goto out_unregister; | |
79a3f20b | 1561 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
1da177e4 LT |
1562 | return 0; |
1563 | out_unregister: | |
1564 | rpcauth_unregister(&authgss_ops); | |
1565 | out: | |
1566 | return err; | |
1567 | } | |
1568 | ||
1569 | static void __exit exit_rpcsec_gss(void) | |
1570 | { | |
1571 | gss_svc_shutdown(); | |
1572 | rpcauth_unregister(&authgss_ops); | |
bf12691d | 1573 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1574 | } |
1575 | ||
1576 | MODULE_LICENSE("GPL"); | |
1577 | module_init(init_rpcsec_gss) | |
1578 | module_exit(exit_rpcsec_gss) |