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