Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/net/sunrpc/auth_gss/auth_gss.c |
1da177e4 LT |
3 | * |
4 | * RPCSEC_GSS client authentication. | |
cca5172a | 5 | * |
1da177e4 LT |
6 | * Copyright (c) 2000 The Regents of the University of Michigan. |
7 | * All rights reserved. | |
8 | * | |
9 | * Dug Song <dugsong@monkey.org> | |
10 | * Andy Adamson <andros@umich.edu> | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * | |
16 | * 1. Redistributions of source code must retain the above copyright | |
17 | * notice, this list of conditions and the following disclaimer. | |
18 | * 2. Redistributions in binary form must reproduce the above copyright | |
19 | * notice, this list of conditions and the following disclaimer in the | |
20 | * documentation and/or other materials provided with the distribution. | |
21 | * 3. Neither the name of the University nor the names of its | |
22 | * contributors may be used to endorse or promote products derived | |
23 | * from this software without specific prior written permission. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
26 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
27 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
28 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
32 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
33 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
34 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
35 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
1da177e4 LT |
36 | */ |
37 | ||
38 | ||
39 | #include <linux/module.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/types.h> | |
42 | #include <linux/slab.h> | |
1da177e4 | 43 | #include <linux/sched.h> |
2d2da60c | 44 | #include <linux/pagemap.h> |
1da177e4 LT |
45 | #include <linux/sunrpc/clnt.h> |
46 | #include <linux/sunrpc/auth.h> | |
47 | #include <linux/sunrpc/auth_gss.h> | |
48 | #include <linux/sunrpc/svcauth_gss.h> | |
49 | #include <linux/sunrpc/gss_err.h> | |
50 | #include <linux/workqueue.h> | |
51 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
52 | #include <linux/sunrpc/gss_api.h> | |
53 | #include <asm/uaccess.h> | |
54 | ||
abfdbd53 TM |
55 | #include "../netns.h" |
56 | ||
f1c0a861 | 57 | static const struct rpc_authops authgss_ops; |
1da177e4 | 58 | |
f1c0a861 | 59 | static const struct rpc_credops gss_credops; |
0df7fb74 | 60 | static const struct rpc_credops gss_nullops; |
1da177e4 | 61 | |
126e216a TM |
62 | #define GSS_RETRY_EXPIRED 5 |
63 | static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; | |
64 | ||
1da177e4 LT |
65 | #ifdef RPC_DEBUG |
66 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
67 | #endif | |
68 | ||
725f2865 | 69 | #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) |
1da177e4 LT |
70 | /* length of a krb5 verifier (48), plus data added before arguments when |
71 | * using integrity (two 4-byte integers): */ | |
adeb8133 | 72 | #define GSS_VERF_SLACK 100 |
1da177e4 | 73 | |
1da177e4 | 74 | struct gss_auth { |
0285ed1f | 75 | struct kref kref; |
1da177e4 LT |
76 | struct rpc_auth rpc_auth; |
77 | struct gss_api_mech *mech; | |
78 | enum rpc_gss_svc service; | |
1da177e4 | 79 | struct rpc_clnt *client; |
34769fc4 BF |
80 | /* |
81 | * There are two upcall pipes; dentry[1], named "gssd", is used | |
82 | * for the new text-based upcall; dentry[0] is named after the | |
83 | * mechanism (for example, "krb5") and exists for | |
84 | * backwards-compatibility with older gssd's. | |
85 | */ | |
c239d83b | 86 | struct rpc_pipe *pipe[2]; |
1da177e4 LT |
87 | }; |
88 | ||
79a3f20b | 89 | /* pipe_version >= 0 if and only if someone has a pipe open. */ |
79a3f20b BF |
90 | static DEFINE_SPINLOCK(pipe_version_lock); |
91 | static struct rpc_wait_queue pipe_version_rpc_waitqueue; | |
92 | static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); | |
cf81939d | 93 | |
5d28dc82 | 94 | static void gss_free_ctx(struct gss_cl_ctx *); |
b693ba4a TM |
95 | static const struct rpc_pipe_ops gss_upcall_ops_v0; |
96 | static const struct rpc_pipe_ops gss_upcall_ops_v1; | |
1da177e4 | 97 | |
1da177e4 LT |
98 | static inline struct gss_cl_ctx * |
99 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
100 | { | |
101 | atomic_inc(&ctx->count); | |
102 | return ctx; | |
103 | } | |
104 | ||
105 | static inline void | |
106 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
107 | { | |
108 | if (atomic_dec_and_test(&ctx->count)) | |
5d28dc82 | 109 | gss_free_ctx(ctx); |
1da177e4 LT |
110 | } |
111 | ||
5d28dc82 TM |
112 | /* gss_cred_set_ctx: |
113 | * called by gss_upcall_callback and gss_create_upcall in order | |
114 | * to set the gss context. The actual exchange of an old context | |
9beae467 | 115 | * and a new one is protected by the pipe->lock. |
5d28dc82 | 116 | */ |
1da177e4 LT |
117 | static void |
118 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
119 | { | |
120 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
5d28dc82 | 121 | |
cd019f75 TM |
122 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
123 | return; | |
7b6962b0 | 124 | gss_get_ctx(ctx); |
cf778b00 | 125 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 | 126 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
cd019f75 | 127 | smp_mb__before_clear_bit(); |
fc432dd9 | 128 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
1da177e4 LT |
129 | } |
130 | ||
131 | static const void * | |
132 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
133 | { | |
134 | const void *q = (const void *)((const char *)p + len); | |
135 | if (unlikely(q > end || q < p)) | |
136 | return ERR_PTR(-EFAULT); | |
137 | memcpy(res, p, len); | |
138 | return q; | |
139 | } | |
140 | ||
141 | static inline const void * | |
142 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
143 | { | |
144 | const void *q; | |
145 | unsigned int len; | |
146 | ||
147 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
148 | if (IS_ERR(p)) | |
149 | return p; | |
150 | q = (const void *)((const char *)p + len); | |
151 | if (unlikely(q > end || q < p)) | |
152 | return ERR_PTR(-EFAULT); | |
0f38b873 | 153 | dest->data = kmemdup(p, len, GFP_NOFS); |
1da177e4 LT |
154 | if (unlikely(dest->data == NULL)) |
155 | return ERR_PTR(-ENOMEM); | |
156 | dest->len = len; | |
1da177e4 LT |
157 | return q; |
158 | } | |
159 | ||
160 | static struct gss_cl_ctx * | |
161 | gss_cred_get_ctx(struct rpc_cred *cred) | |
162 | { | |
163 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
164 | struct gss_cl_ctx *ctx = NULL; | |
165 | ||
5d28dc82 | 166 | rcu_read_lock(); |
1da177e4 LT |
167 | if (gss_cred->gc_ctx) |
168 | ctx = gss_get_ctx(gss_cred->gc_ctx); | |
5d28dc82 | 169 | rcu_read_unlock(); |
1da177e4 LT |
170 | return ctx; |
171 | } | |
172 | ||
173 | static struct gss_cl_ctx * | |
174 | gss_alloc_context(void) | |
175 | { | |
176 | struct gss_cl_ctx *ctx; | |
177 | ||
0f38b873 | 178 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
1da177e4 | 179 | if (ctx != NULL) { |
1da177e4 LT |
180 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
181 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
182 | spin_lock_init(&ctx->gc_seq_lock); | |
183 | atomic_set(&ctx->count,1); | |
184 | } | |
185 | return ctx; | |
186 | } | |
187 | ||
188 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
189 | static const void * | |
190 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
191 | { | |
192 | const void *q; | |
193 | unsigned int seclen; | |
194 | unsigned int timeout; | |
620038f6 | 195 | unsigned long now = jiffies; |
1da177e4 LT |
196 | u32 window_size; |
197 | int ret; | |
198 | ||
620038f6 AA |
199 | /* First unsigned int gives the remaining lifetime in seconds of the |
200 | * credential - e.g. the remaining TGT lifetime for Kerberos or | |
201 | * the -t value passed to GSSD. | |
202 | */ | |
1da177e4 LT |
203 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); |
204 | if (IS_ERR(p)) | |
205 | goto err; | |
206 | if (timeout == 0) | |
207 | timeout = GSSD_MIN_TIMEOUT; | |
620038f6 AA |
208 | ctx->gc_expiry = now + ((unsigned long)timeout * HZ); |
209 | /* Sequence number window. Determines the maximum number of | |
210 | * simultaneous requests | |
211 | */ | |
1da177e4 LT |
212 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); |
213 | if (IS_ERR(p)) | |
214 | goto err; | |
215 | ctx->gc_win = window_size; | |
216 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
217 | if (ctx->gc_win == 0) { | |
dc5ddce9 JL |
218 | /* |
219 | * in which case, p points to an error code. Anything other | |
220 | * than -EKEYEXPIRED gets converted to -EACCES. | |
221 | */ | |
222 | p = simple_get_bytes(p, end, &ret, sizeof(ret)); | |
223 | if (!IS_ERR(p)) | |
224 | p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : | |
225 | ERR_PTR(-EACCES); | |
1da177e4 LT |
226 | goto err; |
227 | } | |
228 | /* copy the opaque wire context */ | |
229 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
230 | if (IS_ERR(p)) | |
231 | goto err; | |
232 | /* import the opaque security context */ | |
233 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
234 | if (IS_ERR(p)) | |
235 | goto err; | |
236 | q = (const void *)((const char *)p + seclen); | |
237 | if (unlikely(q > end || q < p)) { | |
238 | p = ERR_PTR(-EFAULT); | |
239 | goto err; | |
240 | } | |
400f26b5 | 241 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); |
1da177e4 LT |
242 | if (ret < 0) { |
243 | p = ERR_PTR(ret); | |
244 | goto err; | |
245 | } | |
620038f6 AA |
246 | dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u\n", |
247 | __func__, ctx->gc_expiry, now, timeout); | |
1da177e4 LT |
248 | return q; |
249 | err: | |
173db309 | 250 | dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); |
1da177e4 LT |
251 | return p; |
252 | } | |
253 | ||
34769fc4 | 254 | #define UPCALL_BUF_LEN 128 |
1da177e4 LT |
255 | |
256 | struct gss_upcall_msg { | |
257 | atomic_t count; | |
7eaf040b | 258 | kuid_t uid; |
1da177e4 LT |
259 | struct rpc_pipe_msg msg; |
260 | struct list_head list; | |
261 | struct gss_auth *auth; | |
9beae467 | 262 | struct rpc_pipe *pipe; |
1da177e4 LT |
263 | struct rpc_wait_queue rpc_waitqueue; |
264 | wait_queue_head_t waitqueue; | |
265 | struct gss_cl_ctx *ctx; | |
34769fc4 | 266 | char databuf[UPCALL_BUF_LEN]; |
1da177e4 LT |
267 | }; |
268 | ||
2aed8b47 | 269 | static int get_pipe_version(struct net *net) |
79a3f20b | 270 | { |
2aed8b47 | 271 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
79a3f20b BF |
272 | int ret; |
273 | ||
274 | spin_lock(&pipe_version_lock); | |
2aed8b47 TM |
275 | if (sn->pipe_version >= 0) { |
276 | atomic_inc(&sn->pipe_users); | |
277 | ret = sn->pipe_version; | |
79a3f20b BF |
278 | } else |
279 | ret = -EAGAIN; | |
280 | spin_unlock(&pipe_version_lock); | |
281 | return ret; | |
282 | } | |
283 | ||
2aed8b47 | 284 | static void put_pipe_version(struct net *net) |
79a3f20b | 285 | { |
2aed8b47 TM |
286 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
287 | ||
288 | if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { | |
289 | sn->pipe_version = -1; | |
79a3f20b BF |
290 | spin_unlock(&pipe_version_lock); |
291 | } | |
292 | } | |
293 | ||
1da177e4 LT |
294 | static void |
295 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
296 | { | |
2aed8b47 | 297 | struct net *net = rpc_net_ns(gss_msg->auth->client); |
1da177e4 LT |
298 | if (!atomic_dec_and_test(&gss_msg->count)) |
299 | return; | |
2aed8b47 | 300 | put_pipe_version(net); |
1da177e4 LT |
301 | BUG_ON(!list_empty(&gss_msg->list)); |
302 | if (gss_msg->ctx != NULL) | |
303 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 304 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
1da177e4 LT |
305 | kfree(gss_msg); |
306 | } | |
307 | ||
308 | static struct gss_upcall_msg * | |
7eaf040b | 309 | __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid) |
1da177e4 LT |
310 | { |
311 | struct gss_upcall_msg *pos; | |
9beae467 | 312 | list_for_each_entry(pos, &pipe->in_downcall, list) { |
0b4d51b0 | 313 | if (!uid_eq(pos->uid, uid)) |
1da177e4 LT |
314 | continue; |
315 | atomic_inc(&pos->count); | |
632f0d05 | 316 | dprintk("RPC: %s found msg %p\n", __func__, pos); |
1da177e4 LT |
317 | return pos; |
318 | } | |
632f0d05 | 319 | dprintk("RPC: %s found nothing\n", __func__); |
1da177e4 LT |
320 | return NULL; |
321 | } | |
322 | ||
720b8f2d | 323 | /* Try to add an upcall to the pipefs queue. |
1da177e4 LT |
324 | * If an upcall owned by our uid already exists, then we return a reference |
325 | * to that upcall instead of adding the new upcall. | |
326 | */ | |
327 | static inline struct gss_upcall_msg * | |
053e324f | 328 | gss_add_msg(struct gss_upcall_msg *gss_msg) |
1da177e4 | 329 | { |
9beae467 | 330 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 LT |
331 | struct gss_upcall_msg *old; |
332 | ||
9beae467 SK |
333 | spin_lock(&pipe->lock); |
334 | old = __gss_find_upcall(pipe, gss_msg->uid); | |
1da177e4 LT |
335 | if (old == NULL) { |
336 | atomic_inc(&gss_msg->count); | |
9beae467 | 337 | list_add(&gss_msg->list, &pipe->in_downcall); |
1da177e4 LT |
338 | } else |
339 | gss_msg = old; | |
9beae467 | 340 | spin_unlock(&pipe->lock); |
1da177e4 LT |
341 | return gss_msg; |
342 | } | |
343 | ||
344 | static void | |
345 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
346 | { | |
1da177e4 LT |
347 | list_del_init(&gss_msg->list); |
348 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
349 | wake_up_all(&gss_msg->waitqueue); | |
350 | atomic_dec(&gss_msg->count); | |
351 | } | |
352 | ||
353 | static void | |
354 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
355 | { | |
9beae467 | 356 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 357 | |
3b68aaea TM |
358 | if (list_empty(&gss_msg->list)) |
359 | return; | |
9beae467 | 360 | spin_lock(&pipe->lock); |
3b68aaea TM |
361 | if (!list_empty(&gss_msg->list)) |
362 | __gss_unhash_msg(gss_msg); | |
9beae467 | 363 | spin_unlock(&pipe->lock); |
1da177e4 LT |
364 | } |
365 | ||
126e216a TM |
366 | static void |
367 | gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) | |
368 | { | |
369 | switch (gss_msg->msg.errno) { | |
370 | case 0: | |
371 | if (gss_msg->ctx == NULL) | |
372 | break; | |
373 | clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
374 | gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); | |
375 | break; | |
376 | case -EKEYEXPIRED: | |
377 | set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
378 | } | |
379 | gss_cred->gc_upcall_timestamp = jiffies; | |
380 | gss_cred->gc_upcall = NULL; | |
381 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
382 | } | |
383 | ||
1da177e4 LT |
384 | static void |
385 | gss_upcall_callback(struct rpc_task *task) | |
386 | { | |
a17c2153 | 387 | struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, |
1da177e4 LT |
388 | struct gss_cred, gc_base); |
389 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
9beae467 | 390 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 391 | |
9beae467 | 392 | spin_lock(&pipe->lock); |
126e216a | 393 | gss_handle_downcall_result(gss_cred, gss_msg); |
9beae467 | 394 | spin_unlock(&pipe->lock); |
126e216a | 395 | task->tk_status = gss_msg->msg.errno; |
1da177e4 LT |
396 | gss_release_msg(gss_msg); |
397 | } | |
398 | ||
34769fc4 BF |
399 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) |
400 | { | |
90602c7b EB |
401 | uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); |
402 | memcpy(gss_msg->databuf, &uid, sizeof(uid)); | |
403 | gss_msg->msg.data = gss_msg->databuf; | |
404 | gss_msg->msg.len = sizeof(uid); | |
405 | BUG_ON(sizeof(uid) > UPCALL_BUF_LEN); | |
34769fc4 BF |
406 | } |
407 | ||
8b1c7bf5 | 408 | static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
68c97153 TM |
409 | struct rpc_clnt *clnt, |
410 | const char *service_name) | |
34769fc4 | 411 | { |
683ac665 | 412 | struct gss_api_mech *mech = gss_msg->auth->mech; |
8b1c7bf5 OK |
413 | char *p = gss_msg->databuf; |
414 | int len = 0; | |
415 | ||
416 | gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ", | |
683ac665 | 417 | mech->gm_name, |
90602c7b | 418 | from_kuid(&init_user_ns, gss_msg->uid)); |
8b1c7bf5 OK |
419 | p += gss_msg->msg.len; |
420 | if (clnt->cl_principal) { | |
421 | len = sprintf(p, "target=%s ", clnt->cl_principal); | |
422 | p += len; | |
423 | gss_msg->msg.len += len; | |
424 | } | |
68c97153 TM |
425 | if (service_name != NULL) { |
426 | len = sprintf(p, "service=%s ", service_name); | |
2efef708 OK |
427 | p += len; |
428 | gss_msg->msg.len += len; | |
429 | } | |
683ac665 | 430 | if (mech->gm_upcall_enctypes) { |
f8628220 | 431 | len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes); |
683ac665 TM |
432 | p += len; |
433 | gss_msg->msg.len += len; | |
434 | } | |
8b1c7bf5 OK |
435 | len = sprintf(p, "\n"); |
436 | gss_msg->msg.len += len; | |
437 | ||
34769fc4 BF |
438 | gss_msg->msg.data = gss_msg->databuf; |
439 | BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN); | |
440 | } | |
441 | ||
8b1c7bf5 | 442 | static void gss_encode_msg(struct gss_upcall_msg *gss_msg, |
68c97153 TM |
443 | struct rpc_clnt *clnt, |
444 | const char *service_name) | |
34769fc4 | 445 | { |
2aed8b47 TM |
446 | struct net *net = rpc_net_ns(clnt); |
447 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
448 | ||
449 | if (sn->pipe_version == 0) | |
34769fc4 BF |
450 | gss_encode_v0_msg(gss_msg); |
451 | else /* pipe_version == 1 */ | |
68c97153 | 452 | gss_encode_v1_msg(gss_msg, clnt, service_name); |
34769fc4 BF |
453 | } |
454 | ||
68c97153 TM |
455 | static struct gss_upcall_msg * |
456 | gss_alloc_msg(struct gss_auth *gss_auth, struct rpc_clnt *clnt, | |
7eaf040b | 457 | kuid_t uid, const char *service_name) |
1da177e4 LT |
458 | { |
459 | struct gss_upcall_msg *gss_msg; | |
79a3f20b | 460 | int vers; |
1da177e4 | 461 | |
0f38b873 | 462 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
db75b3d6 BF |
463 | if (gss_msg == NULL) |
464 | return ERR_PTR(-ENOMEM); | |
2aed8b47 | 465 | vers = get_pipe_version(rpc_net_ns(clnt)); |
79a3f20b BF |
466 | if (vers < 0) { |
467 | kfree(gss_msg); | |
468 | return ERR_PTR(vers); | |
469 | } | |
c239d83b | 470 | gss_msg->pipe = gss_auth->pipe[vers]; |
db75b3d6 BF |
471 | INIT_LIST_HEAD(&gss_msg->list); |
472 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
473 | init_waitqueue_head(&gss_msg->waitqueue); | |
474 | atomic_set(&gss_msg->count, 1); | |
db75b3d6 BF |
475 | gss_msg->uid = uid; |
476 | gss_msg->auth = gss_auth; | |
68c97153 | 477 | gss_encode_msg(gss_msg, clnt, service_name); |
1da177e4 LT |
478 | return gss_msg; |
479 | } | |
480 | ||
481 | static struct gss_upcall_msg * | |
482 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) | |
483 | { | |
7c67db3a TM |
484 | struct gss_cred *gss_cred = container_of(cred, |
485 | struct gss_cred, gc_base); | |
1da177e4 | 486 | struct gss_upcall_msg *gss_new, *gss_msg; |
7eaf040b | 487 | kuid_t uid = cred->cr_uid; |
1da177e4 | 488 | |
68c97153 | 489 | gss_new = gss_alloc_msg(gss_auth, clnt, uid, gss_cred->gc_principal); |
db75b3d6 BF |
490 | if (IS_ERR(gss_new)) |
491 | return gss_new; | |
053e324f | 492 | gss_msg = gss_add_msg(gss_new); |
1da177e4 | 493 | if (gss_msg == gss_new) { |
9beae467 | 494 | int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); |
1da177e4 LT |
495 | if (res) { |
496 | gss_unhash_msg(gss_new); | |
497 | gss_msg = ERR_PTR(res); | |
498 | } | |
499 | } else | |
500 | gss_release_msg(gss_new); | |
501 | return gss_msg; | |
502 | } | |
503 | ||
b03568c3 BF |
504 | static void warn_gssd(void) |
505 | { | |
506 | static unsigned long ratelimit; | |
507 | unsigned long now = jiffies; | |
508 | ||
509 | if (time_after(now, ratelimit)) { | |
510 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" | |
511 | "Please check user daemon is running.\n"); | |
512 | ratelimit = now + 15*HZ; | |
513 | } | |
514 | } | |
515 | ||
1da177e4 LT |
516 | static inline int |
517 | gss_refresh_upcall(struct rpc_task *task) | |
518 | { | |
a17c2153 | 519 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
4a8c1344 | 520 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
521 | struct gss_auth, rpc_auth); |
522 | struct gss_cred *gss_cred = container_of(cred, | |
523 | struct gss_cred, gc_base); | |
524 | struct gss_upcall_msg *gss_msg; | |
9beae467 | 525 | struct rpc_pipe *pipe; |
1da177e4 LT |
526 | int err = 0; |
527 | ||
632f0d05 | 528 | dprintk("RPC: %5u %s for uid %u\n", |
cdba321e | 529 | task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid)); |
1da177e4 | 530 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
480e3243 | 531 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
79a3f20b BF |
532 | /* XXX: warning on the first, under the assumption we |
533 | * shouldn't normally hit this case on a refresh. */ | |
534 | warn_gssd(); | |
535 | task->tk_timeout = 15*HZ; | |
536 | rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); | |
d1a8016a | 537 | return -EAGAIN; |
79a3f20b | 538 | } |
1da177e4 LT |
539 | if (IS_ERR(gss_msg)) { |
540 | err = PTR_ERR(gss_msg); | |
541 | goto out; | |
542 | } | |
9beae467 SK |
543 | pipe = gss_msg->pipe; |
544 | spin_lock(&pipe->lock); | |
1da177e4 | 545 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 546 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
126e216a | 547 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
1da177e4 LT |
548 | task->tk_timeout = 0; |
549 | gss_cred->gc_upcall = gss_msg; | |
550 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
551 | atomic_inc(&gss_msg->count); | |
5d00837b | 552 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
126e216a TM |
553 | } else { |
554 | gss_handle_downcall_result(gss_cred, gss_msg); | |
1da177e4 | 555 | err = gss_msg->msg.errno; |
126e216a | 556 | } |
9beae467 | 557 | spin_unlock(&pipe->lock); |
1da177e4 LT |
558 | gss_release_msg(gss_msg); |
559 | out: | |
632f0d05 | 560 | dprintk("RPC: %5u %s for uid %u result %d\n", |
cdba321e EB |
561 | task->tk_pid, __func__, |
562 | from_kuid(&init_user_ns, cred->cr_uid), err); | |
1da177e4 LT |
563 | return err; |
564 | } | |
565 | ||
566 | static inline int | |
567 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
568 | { | |
abfdbd53 TM |
569 | struct net *net = rpc_net_ns(gss_auth->client); |
570 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
9beae467 | 571 | struct rpc_pipe *pipe; |
1da177e4 LT |
572 | struct rpc_cred *cred = &gss_cred->gc_base; |
573 | struct gss_upcall_msg *gss_msg; | |
abfdbd53 | 574 | unsigned long timeout; |
1da177e4 | 575 | DEFINE_WAIT(wait); |
d36ccb9c | 576 | int err; |
1da177e4 | 577 | |
cdba321e EB |
578 | dprintk("RPC: %s for uid %u\n", |
579 | __func__, from_kuid(&init_user_ns, cred->cr_uid)); | |
79a3f20b | 580 | retry: |
d36ccb9c | 581 | err = 0; |
abfdbd53 TM |
582 | /* Default timeout is 15s unless we know that gssd is not running */ |
583 | timeout = 15 * HZ; | |
584 | if (!sn->gssd_running) | |
585 | timeout = HZ >> 2; | |
1da177e4 | 586 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
79a3f20b BF |
587 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
588 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, | |
2aed8b47 TM |
589 | sn->pipe_version >= 0, timeout); |
590 | if (sn->pipe_version < 0) { | |
abfdbd53 TM |
591 | if (err == 0) |
592 | sn->gssd_running = 0; | |
d1a8016a BS |
593 | warn_gssd(); |
594 | err = -EACCES; | |
595 | } | |
d36ccb9c | 596 | if (err < 0) |
79a3f20b | 597 | goto out; |
79a3f20b BF |
598 | goto retry; |
599 | } | |
1da177e4 LT |
600 | if (IS_ERR(gss_msg)) { |
601 | err = PTR_ERR(gss_msg); | |
602 | goto out; | |
603 | } | |
9beae467 | 604 | pipe = gss_msg->pipe; |
1da177e4 | 605 | for (;;) { |
5afa9133 | 606 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); |
9beae467 | 607 | spin_lock(&pipe->lock); |
1da177e4 | 608 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
609 | break; |
610 | } | |
9beae467 | 611 | spin_unlock(&pipe->lock); |
5afa9133 | 612 | if (fatal_signal_pending(current)) { |
1da177e4 LT |
613 | err = -ERESTARTSYS; |
614 | goto out_intr; | |
615 | } | |
616 | schedule(); | |
617 | } | |
618 | if (gss_msg->ctx) | |
7b6962b0 | 619 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
620 | else |
621 | err = gss_msg->msg.errno; | |
9beae467 | 622 | spin_unlock(&pipe->lock); |
1da177e4 LT |
623 | out_intr: |
624 | finish_wait(&gss_msg->waitqueue, &wait); | |
625 | gss_release_msg(gss_msg); | |
626 | out: | |
632f0d05 | 627 | dprintk("RPC: %s for uid %u result %d\n", |
cdba321e | 628 | __func__, from_kuid(&init_user_ns, cred->cr_uid), err); |
1da177e4 LT |
629 | return err; |
630 | } | |
631 | ||
1da177e4 LT |
632 | #define MSG_BUF_MAXSIZE 1024 |
633 | ||
634 | static ssize_t | |
635 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
636 | { | |
637 | const void *p, *end; | |
638 | void *buf; | |
1da177e4 | 639 | struct gss_upcall_msg *gss_msg; |
496ad9aa | 640 | struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; |
1da177e4 | 641 | struct gss_cl_ctx *ctx; |
90602c7b EB |
642 | uid_t id; |
643 | kuid_t uid; | |
3b68aaea | 644 | ssize_t err = -EFBIG; |
1da177e4 LT |
645 | |
646 | if (mlen > MSG_BUF_MAXSIZE) | |
647 | goto out; | |
648 | err = -ENOMEM; | |
0f38b873 | 649 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
650 | if (!buf) |
651 | goto out; | |
652 | ||
1da177e4 LT |
653 | err = -EFAULT; |
654 | if (copy_from_user(buf, src, mlen)) | |
655 | goto err; | |
656 | ||
657 | end = (const void *)((char *)buf + mlen); | |
90602c7b | 658 | p = simple_get_bytes(buf, end, &id, sizeof(id)); |
1da177e4 LT |
659 | if (IS_ERR(p)) { |
660 | err = PTR_ERR(p); | |
661 | goto err; | |
662 | } | |
663 | ||
90602c7b EB |
664 | uid = make_kuid(&init_user_ns, id); |
665 | if (!uid_valid(uid)) { | |
666 | err = -EINVAL; | |
667 | goto err; | |
668 | } | |
669 | ||
1da177e4 LT |
670 | err = -ENOMEM; |
671 | ctx = gss_alloc_context(); | |
672 | if (ctx == NULL) | |
673 | goto err; | |
3b68aaea TM |
674 | |
675 | err = -ENOENT; | |
676 | /* Find a matching upcall */ | |
9beae467 SK |
677 | spin_lock(&pipe->lock); |
678 | gss_msg = __gss_find_upcall(pipe, uid); | |
3b68aaea | 679 | if (gss_msg == NULL) { |
9beae467 | 680 | spin_unlock(&pipe->lock); |
3b68aaea TM |
681 | goto err_put_ctx; |
682 | } | |
683 | list_del_init(&gss_msg->list); | |
9beae467 | 684 | spin_unlock(&pipe->lock); |
3b68aaea | 685 | |
6e84c7b6 | 686 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
687 | if (IS_ERR(p)) { |
688 | err = PTR_ERR(p); | |
486bad2e JL |
689 | switch (err) { |
690 | case -EACCES: | |
dc5ddce9 | 691 | case -EKEYEXPIRED: |
486bad2e JL |
692 | gss_msg->msg.errno = err; |
693 | err = mlen; | |
694 | break; | |
695 | case -EFAULT: | |
696 | case -ENOMEM: | |
697 | case -EINVAL: | |
698 | case -ENOSYS: | |
699 | gss_msg->msg.errno = -EAGAIN; | |
700 | break; | |
701 | default: | |
702 | printk(KERN_CRIT "%s: bad return from " | |
6c853099 | 703 | "gss_fill_context: %zd\n", __func__, err); |
486bad2e JL |
704 | BUG(); |
705 | } | |
3b68aaea | 706 | goto err_release_msg; |
1da177e4 | 707 | } |
3b68aaea TM |
708 | gss_msg->ctx = gss_get_ctx(ctx); |
709 | err = mlen; | |
710 | ||
711 | err_release_msg: | |
9beae467 | 712 | spin_lock(&pipe->lock); |
3b68aaea | 713 | __gss_unhash_msg(gss_msg); |
9beae467 | 714 | spin_unlock(&pipe->lock); |
3b68aaea | 715 | gss_release_msg(gss_msg); |
1da177e4 LT |
716 | err_put_ctx: |
717 | gss_put_ctx(ctx); | |
718 | err: | |
719 | kfree(buf); | |
720 | out: | |
632f0d05 | 721 | dprintk("RPC: %s returning %Zd\n", __func__, err); |
1da177e4 LT |
722 | return err; |
723 | } | |
724 | ||
34769fc4 | 725 | static int gss_pipe_open(struct inode *inode, int new_version) |
cf81939d | 726 | { |
2aed8b47 TM |
727 | struct net *net = inode->i_sb->s_fs_info; |
728 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
34769fc4 BF |
729 | int ret = 0; |
730 | ||
79a3f20b | 731 | spin_lock(&pipe_version_lock); |
2aed8b47 | 732 | if (sn->pipe_version < 0) { |
34769fc4 | 733 | /* First open of any gss pipe determines the version: */ |
2aed8b47 | 734 | sn->pipe_version = new_version; |
79a3f20b BF |
735 | rpc_wake_up(&pipe_version_rpc_waitqueue); |
736 | wake_up(&pipe_version_waitqueue); | |
2aed8b47 | 737 | } else if (sn->pipe_version != new_version) { |
34769fc4 BF |
738 | /* Trying to open a pipe of a different version */ |
739 | ret = -EBUSY; | |
740 | goto out; | |
79a3f20b | 741 | } |
2aed8b47 | 742 | atomic_inc(&sn->pipe_users); |
34769fc4 | 743 | out: |
79a3f20b | 744 | spin_unlock(&pipe_version_lock); |
34769fc4 BF |
745 | return ret; |
746 | ||
747 | } | |
748 | ||
749 | static int gss_pipe_open_v0(struct inode *inode) | |
750 | { | |
751 | return gss_pipe_open(inode, 0); | |
752 | } | |
753 | ||
754 | static int gss_pipe_open_v1(struct inode *inode) | |
755 | { | |
756 | return gss_pipe_open(inode, 1); | |
cf81939d BF |
757 | } |
758 | ||
1da177e4 LT |
759 | static void |
760 | gss_pipe_release(struct inode *inode) | |
761 | { | |
2aed8b47 | 762 | struct net *net = inode->i_sb->s_fs_info; |
9beae467 | 763 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
6e84c7b6 | 764 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 765 | |
5a67657a | 766 | restart: |
9beae467 SK |
767 | spin_lock(&pipe->lock); |
768 | list_for_each_entry(gss_msg, &pipe->in_downcall, list) { | |
1da177e4 | 769 | |
5a67657a TM |
770 | if (!list_empty(&gss_msg->msg.list)) |
771 | continue; | |
1da177e4 LT |
772 | gss_msg->msg.errno = -EPIPE; |
773 | atomic_inc(&gss_msg->count); | |
774 | __gss_unhash_msg(gss_msg); | |
9beae467 | 775 | spin_unlock(&pipe->lock); |
1da177e4 | 776 | gss_release_msg(gss_msg); |
5a67657a | 777 | goto restart; |
1da177e4 | 778 | } |
9beae467 | 779 | spin_unlock(&pipe->lock); |
cf81939d | 780 | |
2aed8b47 | 781 | put_pipe_version(net); |
1da177e4 LT |
782 | } |
783 | ||
784 | static void | |
785 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
786 | { | |
787 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
1da177e4 LT |
788 | |
789 | if (msg->errno < 0) { | |
632f0d05 CL |
790 | dprintk("RPC: %s releasing msg %p\n", |
791 | __func__, gss_msg); | |
1da177e4 LT |
792 | atomic_inc(&gss_msg->count); |
793 | gss_unhash_msg(gss_msg); | |
b03568c3 BF |
794 | if (msg->errno == -ETIMEDOUT) |
795 | warn_gssd(); | |
1da177e4 LT |
796 | gss_release_msg(gss_msg); |
797 | } | |
798 | } | |
799 | ||
ccdc28f8 SK |
800 | static void gss_pipes_dentries_destroy(struct rpc_auth *auth) |
801 | { | |
802 | struct gss_auth *gss_auth; | |
803 | ||
804 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
80df9d20 SK |
805 | if (gss_auth->pipe[0]->dentry) |
806 | rpc_unlink(gss_auth->pipe[0]->dentry); | |
807 | if (gss_auth->pipe[1]->dentry) | |
808 | rpc_unlink(gss_auth->pipe[1]->dentry); | |
ccdc28f8 SK |
809 | } |
810 | ||
811 | static int gss_pipes_dentries_create(struct rpc_auth *auth) | |
812 | { | |
813 | int err; | |
814 | struct gss_auth *gss_auth; | |
815 | struct rpc_clnt *clnt; | |
816 | ||
817 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
818 | clnt = gss_auth->client; | |
819 | ||
30507f58 | 820 | gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry, |
ccdc28f8 SK |
821 | "gssd", |
822 | clnt, gss_auth->pipe[1]); | |
823 | if (IS_ERR(gss_auth->pipe[1]->dentry)) | |
824 | return PTR_ERR(gss_auth->pipe[1]->dentry); | |
30507f58 | 825 | gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry, |
ccdc28f8 SK |
826 | gss_auth->mech->gm_name, |
827 | clnt, gss_auth->pipe[0]); | |
828 | if (IS_ERR(gss_auth->pipe[0]->dentry)) { | |
829 | err = PTR_ERR(gss_auth->pipe[0]->dentry); | |
830 | goto err_unlink_pipe_1; | |
831 | } | |
832 | return 0; | |
833 | ||
834 | err_unlink_pipe_1: | |
835 | rpc_unlink(gss_auth->pipe[1]->dentry); | |
836 | return err; | |
837 | } | |
838 | ||
839 | static void gss_pipes_dentries_destroy_net(struct rpc_clnt *clnt, | |
840 | struct rpc_auth *auth) | |
841 | { | |
2446ab60 | 842 | struct net *net = rpc_net_ns(clnt); |
ccdc28f8 SK |
843 | struct super_block *sb; |
844 | ||
845 | sb = rpc_get_sb_net(net); | |
846 | if (sb) { | |
30507f58 | 847 | if (clnt->cl_dentry) |
ccdc28f8 SK |
848 | gss_pipes_dentries_destroy(auth); |
849 | rpc_put_sb_net(net); | |
850 | } | |
851 | } | |
852 | ||
853 | static int gss_pipes_dentries_create_net(struct rpc_clnt *clnt, | |
854 | struct rpc_auth *auth) | |
855 | { | |
2446ab60 | 856 | struct net *net = rpc_net_ns(clnt); |
ccdc28f8 SK |
857 | struct super_block *sb; |
858 | int err = 0; | |
859 | ||
860 | sb = rpc_get_sb_net(net); | |
861 | if (sb) { | |
30507f58 | 862 | if (clnt->cl_dentry) |
ccdc28f8 SK |
863 | err = gss_pipes_dentries_create(auth); |
864 | rpc_put_sb_net(net); | |
865 | } | |
866 | return err; | |
867 | } | |
868 | ||
cca5172a YH |
869 | /* |
870 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
871 | * parameters based on the input flavor (which must be a pseudoflavor) |
872 | */ | |
873 | static struct rpc_auth * | |
874 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
875 | { | |
876 | struct gss_auth *gss_auth; | |
877 | struct rpc_auth * auth; | |
6a19275a | 878 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 879 | |
8885cb36 | 880 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
881 | |
882 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 883 | return ERR_PTR(err); |
1da177e4 LT |
884 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
885 | goto out_dec; | |
886 | gss_auth->client = clnt; | |
6a19275a | 887 | err = -EINVAL; |
1da177e4 LT |
888 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
889 | if (!gss_auth->mech) { | |
9b1d75b7 | 890 | dprintk("RPC: Pseudoflavor %d not found!\n", flavor); |
1da177e4 LT |
891 | goto err_free; |
892 | } | |
893 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
894 | if (gss_auth->service == 0) |
895 | goto err_put_mech; | |
1da177e4 LT |
896 | auth = &gss_auth->rpc_auth; |
897 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
898 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
899 | auth->au_ops = &authgss_ops; | |
900 | auth->au_flavor = flavor; | |
901 | atomic_set(&auth->au_count, 1); | |
0285ed1f | 902 | kref_init(&gss_auth->kref); |
1da177e4 | 903 | |
34769fc4 BF |
904 | /* |
905 | * Note: if we created the old pipe first, then someone who | |
906 | * examined the directory at the right moment might conclude | |
907 | * that we supported only the old pipe. So we instead create | |
908 | * the new pipe first. | |
909 | */ | |
c239d83b SK |
910 | gss_auth->pipe[1] = rpc_mkpipe_data(&gss_upcall_ops_v1, |
911 | RPC_PIPE_WAIT_FOR_OPEN); | |
912 | if (IS_ERR(gss_auth->pipe[1])) { | |
913 | err = PTR_ERR(gss_auth->pipe[1]); | |
1da177e4 | 914 | goto err_put_mech; |
6a19275a | 915 | } |
1da177e4 | 916 | |
c239d83b SK |
917 | gss_auth->pipe[0] = rpc_mkpipe_data(&gss_upcall_ops_v0, |
918 | RPC_PIPE_WAIT_FOR_OPEN); | |
919 | if (IS_ERR(gss_auth->pipe[0])) { | |
920 | err = PTR_ERR(gss_auth->pipe[0]); | |
921 | goto err_destroy_pipe_1; | |
922 | } | |
ccdc28f8 SK |
923 | err = gss_pipes_dentries_create_net(clnt, auth); |
924 | if (err) | |
c239d83b | 925 | goto err_destroy_pipe_0; |
f5c2187c | 926 | err = rpcauth_init_credcache(auth); |
07a2bf1d | 927 | if (err) |
ccdc28f8 | 928 | goto err_unlink_pipes; |
07a2bf1d | 929 | |
1da177e4 | 930 | return auth; |
ccdc28f8 SK |
931 | err_unlink_pipes: |
932 | gss_pipes_dentries_destroy_net(clnt, auth); | |
c239d83b SK |
933 | err_destroy_pipe_0: |
934 | rpc_destroy_pipe_data(gss_auth->pipe[0]); | |
935 | err_destroy_pipe_1: | |
936 | rpc_destroy_pipe_data(gss_auth->pipe[1]); | |
1da177e4 LT |
937 | err_put_mech: |
938 | gss_mech_put(gss_auth->mech); | |
939 | err_free: | |
940 | kfree(gss_auth); | |
941 | out_dec: | |
942 | module_put(THIS_MODULE); | |
6a19275a | 943 | return ERR_PTR(err); |
1da177e4 LT |
944 | } |
945 | ||
0285ed1f TM |
946 | static void |
947 | gss_free(struct gss_auth *gss_auth) | |
948 | { | |
ccdc28f8 | 949 | gss_pipes_dentries_destroy_net(gss_auth->client, &gss_auth->rpc_auth); |
c239d83b SK |
950 | rpc_destroy_pipe_data(gss_auth->pipe[0]); |
951 | rpc_destroy_pipe_data(gss_auth->pipe[1]); | |
0285ed1f TM |
952 | gss_mech_put(gss_auth->mech); |
953 | ||
954 | kfree(gss_auth); | |
955 | module_put(THIS_MODULE); | |
956 | } | |
957 | ||
958 | static void | |
959 | gss_free_callback(struct kref *kref) | |
960 | { | |
961 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
962 | ||
963 | gss_free(gss_auth); | |
964 | } | |
965 | ||
1da177e4 LT |
966 | static void |
967 | gss_destroy(struct rpc_auth *auth) | |
968 | { | |
969 | struct gss_auth *gss_auth; | |
970 | ||
8885cb36 CL |
971 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
972 | auth, auth->au_flavor); | |
1da177e4 | 973 | |
3ab9bb72 TM |
974 | rpcauth_destroy_credcache(auth); |
975 | ||
1da177e4 | 976 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
0285ed1f | 977 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
978 | } |
979 | ||
0df7fb74 TM |
980 | /* |
981 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call | |
982 | * to the server with the GSS control procedure field set to | |
983 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
984 | * all RPCSEC_GSS state associated with that context. | |
985 | */ | |
986 | static int | |
987 | gss_destroying_context(struct rpc_cred *cred) | |
988 | { | |
989 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
990 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
991 | struct rpc_task *task; | |
992 | ||
993 | if (gss_cred->gc_ctx == NULL || | |
6dcd3926 | 994 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
0df7fb74 TM |
995 | return 0; |
996 | ||
997 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
998 | cred->cr_ops = &gss_nullops; | |
999 | ||
1000 | /* Take a reference to ensure the cred will be destroyed either | |
1001 | * by the RPC call or by the put_rpccred() below */ | |
1002 | get_rpccred(cred); | |
1003 | ||
080a1f14 | 1004 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
0df7fb74 TM |
1005 | if (!IS_ERR(task)) |
1006 | rpc_put_task(task); | |
1007 | ||
1008 | put_rpccred(cred); | |
1009 | return 1; | |
1010 | } | |
1011 | ||
1012 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
1013 | * to create a new cred or context, so they check that things have been |
1014 | * allocated before freeing them. */ | |
1015 | static void | |
5d28dc82 | 1016 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 1017 | { |
632f0d05 | 1018 | dprintk("RPC: %s\n", __func__); |
1da177e4 | 1019 | |
0d8a3746 | 1020 | gss_delete_sec_context(&ctx->gc_gss_ctx); |
1da177e4 LT |
1021 | kfree(ctx->gc_wire_ctx.data); |
1022 | kfree(ctx); | |
1023 | } | |
1024 | ||
5d28dc82 TM |
1025 | static void |
1026 | gss_free_ctx_callback(struct rcu_head *head) | |
1027 | { | |
1028 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
1029 | gss_do_free_ctx(ctx); | |
1030 | } | |
1031 | ||
1032 | static void | |
1033 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
1034 | { | |
1035 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); | |
1036 | } | |
1037 | ||
1da177e4 | 1038 | static void |
31be5bf1 | 1039 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 1040 | { |
632f0d05 | 1041 | dprintk("RPC: %s cred=%p\n", __func__, gss_cred); |
31be5bf1 TM |
1042 | kfree(gss_cred); |
1043 | } | |
1da177e4 | 1044 | |
31be5bf1 TM |
1045 | static void |
1046 | gss_free_cred_callback(struct rcu_head *head) | |
1047 | { | |
1048 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
1049 | gss_free_cred(gss_cred); | |
1050 | } | |
1da177e4 | 1051 | |
31be5bf1 | 1052 | static void |
6dcd3926 | 1053 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 1054 | { |
5d28dc82 | 1055 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 1056 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
5d28dc82 TM |
1057 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
1058 | ||
a9b3cd7f | 1059 | RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); |
31be5bf1 | 1060 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
1061 | if (ctx) |
1062 | gss_put_ctx(ctx); | |
0285ed1f | 1063 | kref_put(&gss_auth->kref, gss_free_callback); |
1da177e4 LT |
1064 | } |
1065 | ||
6dcd3926 JL |
1066 | static void |
1067 | gss_destroy_cred(struct rpc_cred *cred) | |
1068 | { | |
1069 | ||
1070 | if (gss_destroying_context(cred)) | |
1071 | return; | |
1072 | gss_destroy_nullcred(cred); | |
1073 | } | |
1074 | ||
1da177e4 LT |
1075 | /* |
1076 | * Lookup RPCSEC_GSS cred for the current process | |
1077 | */ | |
1078 | static struct rpc_cred * | |
8a317760 | 1079 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 1080 | { |
8a317760 | 1081 | return rpcauth_lookup_credcache(auth, acred, flags); |
1da177e4 LT |
1082 | } |
1083 | ||
1084 | static struct rpc_cred * | |
8a317760 | 1085 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 LT |
1086 | { |
1087 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1088 | struct gss_cred *cred = NULL; | |
1089 | int err = -ENOMEM; | |
1090 | ||
632f0d05 | 1091 | dprintk("RPC: %s for uid %d, flavor %d\n", |
cdba321e EB |
1092 | __func__, from_kuid(&init_user_ns, acred->uid), |
1093 | auth->au_flavor); | |
1da177e4 | 1094 | |
0f38b873 | 1095 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
1da177e4 LT |
1096 | goto out_err; |
1097 | ||
5fe4755e | 1098 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
1099 | /* |
1100 | * Note: in order to force a call to call_refresh(), we deliberately | |
1101 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
1102 | */ | |
fc432dd9 | 1103 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 1104 | cred->gc_service = gss_auth->service; |
68c97153 TM |
1105 | cred->gc_principal = NULL; |
1106 | if (acred->machine_cred) | |
1107 | cred->gc_principal = acred->principal; | |
0285ed1f | 1108 | kref_get(&gss_auth->kref); |
1da177e4 LT |
1109 | return &cred->gc_base; |
1110 | ||
1111 | out_err: | |
632f0d05 | 1112 | dprintk("RPC: %s failed with error %d\n", __func__, err); |
1da177e4 LT |
1113 | return ERR_PTR(err); |
1114 | } | |
1115 | ||
fba3bad4 TM |
1116 | static int |
1117 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
1118 | { | |
1119 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1120 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
1121 | int err; | |
1122 | ||
1123 | do { | |
1124 | err = gss_create_upcall(gss_auth, gss_cred); | |
1125 | } while (err == -EAGAIN); | |
1126 | return err; | |
1127 | } | |
1128 | ||
1da177e4 | 1129 | static int |
8a317760 | 1130 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
1131 | { |
1132 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
1133 | ||
cd019f75 | 1134 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 1135 | goto out; |
1da177e4 | 1136 | /* Don't match with creds that have expired. */ |
cd019f75 TM |
1137 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
1138 | return 0; | |
1139 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) | |
1da177e4 | 1140 | return 0; |
8a317760 | 1141 | out: |
68c97153 TM |
1142 | if (acred->principal != NULL) { |
1143 | if (gss_cred->gc_principal == NULL) | |
1144 | return 0; | |
1145 | return strcmp(acred->principal, gss_cred->gc_principal) == 0; | |
1146 | } | |
1147 | if (gss_cred->gc_principal != NULL) | |
7c67db3a | 1148 | return 0; |
0b4d51b0 | 1149 | return uid_eq(rc->cr_uid, acred->uid); |
1da177e4 LT |
1150 | } |
1151 | ||
1152 | /* | |
1153 | * Marshal credentials. | |
1154 | * Maybe we should keep a cached credential for performance reasons. | |
1155 | */ | |
d8ed029d AD |
1156 | static __be32 * |
1157 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1158 | { |
a17c2153 TM |
1159 | struct rpc_rqst *req = task->tk_rqstp; |
1160 | struct rpc_cred *cred = req->rq_cred; | |
1da177e4 LT |
1161 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1162 | gc_base); | |
1163 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1164 | __be32 *cred_len; |
1da177e4 LT |
1165 | u32 maj_stat = 0; |
1166 | struct xdr_netobj mic; | |
1167 | struct kvec iov; | |
1168 | struct xdr_buf verf_buf; | |
1169 | ||
632f0d05 | 1170 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1171 | |
1172 | *p++ = htonl(RPC_AUTH_GSS); | |
1173 | cred_len = p++; | |
1174 | ||
1175 | spin_lock(&ctx->gc_seq_lock); | |
1176 | req->rq_seqno = ctx->gc_seq++; | |
1177 | spin_unlock(&ctx->gc_seq_lock); | |
1178 | ||
1179 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
1180 | *p++ = htonl((u32) ctx->gc_proc); | |
1181 | *p++ = htonl((u32) req->rq_seqno); | |
1182 | *p++ = htonl((u32) gss_cred->gc_service); | |
1183 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
1184 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
1185 | ||
1186 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
1187 | * starting with the xid and ending at the end of the credential: */ | |
a4f0835c | 1188 | iov.iov_base = xprt_skip_transport_header(req->rq_xprt, |
808012fb | 1189 | req->rq_snd_buf.head[0].iov_base); |
1da177e4 LT |
1190 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
1191 | xdr_buf_from_iov(&iov, &verf_buf); | |
1192 | ||
1193 | /* set verifier flavor*/ | |
1194 | *p++ = htonl(RPC_AUTH_GSS); | |
1195 | ||
1196 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 1197 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1198 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 1199 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1200 | } else if (maj_stat != 0) { |
1201 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
1202 | goto out_put_ctx; | |
1203 | } | |
1204 | p = xdr_encode_opaque(p, NULL, mic.len); | |
1205 | gss_put_ctx(ctx); | |
1206 | return p; | |
1207 | out_put_ctx: | |
1208 | gss_put_ctx(ctx); | |
1209 | return NULL; | |
1210 | } | |
1211 | ||
cd019f75 TM |
1212 | static int gss_renew_cred(struct rpc_task *task) |
1213 | { | |
a17c2153 | 1214 | struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1215 | struct gss_cred *gss_cred = container_of(oldcred, |
1216 | struct gss_cred, | |
1217 | gc_base); | |
1218 | struct rpc_auth *auth = oldcred->cr_auth; | |
1219 | struct auth_cred acred = { | |
1220 | .uid = oldcred->cr_uid, | |
68c97153 TM |
1221 | .principal = gss_cred->gc_principal, |
1222 | .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), | |
cd019f75 TM |
1223 | }; |
1224 | struct rpc_cred *new; | |
1225 | ||
1226 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
1227 | if (IS_ERR(new)) | |
1228 | return PTR_ERR(new); | |
a17c2153 | 1229 | task->tk_rqstp->rq_cred = new; |
cd019f75 TM |
1230 | put_rpccred(oldcred); |
1231 | return 0; | |
1232 | } | |
1233 | ||
126e216a TM |
1234 | static int gss_cred_is_negative_entry(struct rpc_cred *cred) |
1235 | { | |
1236 | if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { | |
1237 | unsigned long now = jiffies; | |
1238 | unsigned long begin, expire; | |
1239 | struct gss_cred *gss_cred; | |
1240 | ||
1241 | gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1242 | begin = gss_cred->gc_upcall_timestamp; | |
1243 | expire = begin + gss_expired_cred_retry_delay * HZ; | |
1244 | ||
1245 | if (time_in_range_open(now, begin, expire)) | |
1246 | return 1; | |
1247 | } | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1da177e4 LT |
1251 | /* |
1252 | * Refresh credentials. XXX - finish | |
1253 | */ | |
1254 | static int | |
1255 | gss_refresh(struct rpc_task *task) | |
1256 | { | |
a17c2153 | 1257 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1258 | int ret = 0; |
1259 | ||
126e216a TM |
1260 | if (gss_cred_is_negative_entry(cred)) |
1261 | return -EKEYEXPIRED; | |
1262 | ||
cd019f75 TM |
1263 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
1264 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
1265 | ret = gss_renew_cred(task); | |
1266 | if (ret < 0) | |
1267 | goto out; | |
a17c2153 | 1268 | cred = task->tk_rqstp->rq_cred; |
cd019f75 | 1269 | } |
1da177e4 | 1270 | |
cd019f75 TM |
1271 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
1272 | ret = gss_refresh_upcall(task); | |
1273 | out: | |
1274 | return ret; | |
1da177e4 LT |
1275 | } |
1276 | ||
0df7fb74 TM |
1277 | /* Dummy refresh routine: used only when destroying the context */ |
1278 | static int | |
1279 | gss_refresh_null(struct rpc_task *task) | |
1280 | { | |
1281 | return -EACCES; | |
1282 | } | |
1283 | ||
d8ed029d AD |
1284 | static __be32 * |
1285 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1286 | { |
a17c2153 | 1287 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 | 1288 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
d8ed029d | 1289 | __be32 seq; |
1da177e4 LT |
1290 | struct kvec iov; |
1291 | struct xdr_buf verf_buf; | |
1292 | struct xdr_netobj mic; | |
1293 | u32 flav,len; | |
1294 | u32 maj_stat; | |
1295 | ||
632f0d05 | 1296 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1297 | |
1298 | flav = ntohl(*p++); | |
1299 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 1300 | goto out_bad; |
1da177e4 LT |
1301 | if (flav != RPC_AUTH_GSS) |
1302 | goto out_bad; | |
1303 | seq = htonl(task->tk_rqstp->rq_seqno); | |
1304 | iov.iov_base = &seq; | |
1305 | iov.iov_len = sizeof(seq); | |
1306 | xdr_buf_from_iov(&iov, &verf_buf); | |
1307 | mic.data = (u8 *)p; | |
1308 | mic.len = len; | |
1309 | ||
00fd6e14 | 1310 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1311 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1312 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 1313 | if (maj_stat) { |
632f0d05 CL |
1314 | dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", |
1315 | task->tk_pid, __func__, maj_stat); | |
1da177e4 | 1316 | goto out_bad; |
0df7fb74 | 1317 | } |
24b2605b BF |
1318 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1319 | * calculate the length of the verifier: */ | |
1be27f36 | 1320 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 1321 | gss_put_ctx(ctx); |
632f0d05 CL |
1322 | dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", |
1323 | task->tk_pid, __func__); | |
1da177e4 LT |
1324 | return p + XDR_QUADLEN(len); |
1325 | out_bad: | |
1326 | gss_put_ctx(ctx); | |
632f0d05 | 1327 | dprintk("RPC: %5u %s failed.\n", task->tk_pid, __func__); |
1da177e4 LT |
1328 | return NULL; |
1329 | } | |
1330 | ||
9f06c719 CL |
1331 | static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, |
1332 | __be32 *p, void *obj) | |
1333 | { | |
1334 | struct xdr_stream xdr; | |
1335 | ||
1336 | xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); | |
1337 | encode(rqstp, &xdr, obj); | |
1338 | } | |
1339 | ||
1da177e4 LT |
1340 | static inline int |
1341 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1342 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1343 | __be32 *p, void *obj) | |
1da177e4 LT |
1344 | { |
1345 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1346 | struct xdr_buf integ_buf; | |
d8ed029d | 1347 | __be32 *integ_len = NULL; |
1da177e4 | 1348 | struct xdr_netobj mic; |
d8ed029d AD |
1349 | u32 offset; |
1350 | __be32 *q; | |
1da177e4 LT |
1351 | struct kvec *iov; |
1352 | u32 maj_stat = 0; | |
1353 | int status = -EIO; | |
1354 | ||
1355 | integ_len = p++; | |
1356 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1357 | *p++ = htonl(rqstp->rq_seqno); | |
1358 | ||
9f06c719 | 1359 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1da177e4 LT |
1360 | |
1361 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1362 | offset, snd_buf->len - offset)) | |
1363 | return status; | |
1364 | *integ_len = htonl(integ_buf.len); | |
1365 | ||
1366 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1367 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1368 | iov = snd_buf->tail; |
1369 | else | |
1370 | iov = snd_buf->head; | |
1371 | p = iov->iov_base + iov->iov_len; | |
1372 | mic.data = (u8 *)(p + 1); | |
1373 | ||
00fd6e14 | 1374 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1375 | status = -EIO; /* XXX? */ |
1376 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1377 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1378 | else if (maj_stat) |
1379 | return status; | |
1380 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1381 | ||
1382 | offset = (u8 *)q - (u8 *)p; | |
1383 | iov->iov_len += offset; | |
1384 | snd_buf->len += offset; | |
1385 | return 0; | |
1386 | } | |
1387 | ||
2d2da60c BF |
1388 | static void |
1389 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1390 | { | |
1391 | int i; | |
1392 | ||
1393 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1394 | __free_page(rqstp->rq_enc_pages[i]); | |
1395 | kfree(rqstp->rq_enc_pages); | |
1396 | } | |
1397 | ||
1398 | static int | |
1399 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1400 | { | |
1401 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1402 | int first, last, i; | |
1403 | ||
1404 | if (snd_buf->page_len == 0) { | |
1405 | rqstp->rq_enc_pages_num = 0; | |
1406 | return 0; | |
1407 | } | |
1408 | ||
1409 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1410 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; | |
1411 | rqstp->rq_enc_pages_num = last - first + 1 + 1; | |
1412 | rqstp->rq_enc_pages | |
1413 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), | |
1414 | GFP_NOFS); | |
1415 | if (!rqstp->rq_enc_pages) | |
1416 | goto out; | |
1417 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1418 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1419 | if (rqstp->rq_enc_pages[i] == NULL) | |
1420 | goto out_free; | |
1421 | } | |
1422 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1423 | return 0; | |
1424 | out_free: | |
cdead7cf TM |
1425 | rqstp->rq_enc_pages_num = i; |
1426 | priv_release_snd_buf(rqstp); | |
2d2da60c BF |
1427 | out: |
1428 | return -EAGAIN; | |
1429 | } | |
1430 | ||
1431 | static inline int | |
1432 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1433 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1434 | __be32 *p, void *obj) | |
2d2da60c BF |
1435 | { |
1436 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1437 | u32 offset; | |
1438 | u32 maj_stat; | |
1439 | int status; | |
d8ed029d | 1440 | __be32 *opaque_len; |
2d2da60c BF |
1441 | struct page **inpages; |
1442 | int first; | |
1443 | int pad; | |
1444 | struct kvec *iov; | |
1445 | char *tmp; | |
1446 | ||
1447 | opaque_len = p++; | |
1448 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1449 | *p++ = htonl(rqstp->rq_seqno); | |
1450 | ||
9f06c719 | 1451 | gss_wrap_req_encode(encode, rqstp, p, obj); |
2d2da60c BF |
1452 | |
1453 | status = alloc_enc_pages(rqstp); | |
1454 | if (status) | |
1455 | return status; | |
1456 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; | |
1457 | inpages = snd_buf->pages + first; | |
1458 | snd_buf->pages = rqstp->rq_enc_pages; | |
1459 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; | |
7561042f KC |
1460 | /* |
1461 | * Give the tail its own page, in case we need extra space in the | |
1462 | * head when wrapping: | |
1463 | * | |
1464 | * call_allocate() allocates twice the slack space required | |
1465 | * by the authentication flavor to rq_callsize. | |
1466 | * For GSS, slack is GSS_CRED_SLACK. | |
1467 | */ | |
2d2da60c BF |
1468 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
1469 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1470 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1471 | snd_buf->tail[0].iov_base = tmp; | |
1472 | } | |
00fd6e14 | 1473 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
7561042f | 1474 | /* slack space should prevent this ever happening: */ |
2d2da60c | 1475 | BUG_ON(snd_buf->len > snd_buf->buflen); |
cca5172a | 1476 | status = -EIO; |
2d2da60c BF |
1477 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1478 | * done anyway, so it's safe to put the request on the wire: */ | |
1479 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1480 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1481 | else if (maj_stat) |
1482 | return status; | |
1483 | ||
1484 | *opaque_len = htonl(snd_buf->len - offset); | |
1485 | /* guess whether we're in the head or the tail: */ | |
1486 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1487 | iov = snd_buf->tail; | |
1488 | else | |
1489 | iov = snd_buf->head; | |
1490 | p = iov->iov_base + iov->iov_len; | |
1491 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1492 | memset(p, 0, pad); | |
1493 | iov->iov_len += pad; | |
1494 | snd_buf->len += pad; | |
1495 | ||
1496 | return 0; | |
1497 | } | |
1498 | ||
1da177e4 LT |
1499 | static int |
1500 | gss_wrap_req(struct rpc_task *task, | |
9f06c719 | 1501 | kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1502 | { |
a17c2153 | 1503 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1504 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1505 | gc_base); | |
1506 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1507 | int status = -EIO; | |
1508 | ||
632f0d05 | 1509 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1510 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1511 | /* The spec seems a little ambiguous here, but I think that not | |
1512 | * wrapping context destruction requests makes the most sense. | |
1513 | */ | |
9f06c719 CL |
1514 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1515 | status = 0; | |
1da177e4 LT |
1516 | goto out; |
1517 | } | |
1518 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1519 | case RPC_GSS_SVC_NONE: |
1520 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1521 | status = 0; | |
1522 | break; | |
1523 | case RPC_GSS_SVC_INTEGRITY: | |
1524 | status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); | |
1525 | break; | |
1526 | case RPC_GSS_SVC_PRIVACY: | |
1527 | status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); | |
1528 | break; | |
1da177e4 LT |
1529 | } |
1530 | out: | |
1531 | gss_put_ctx(ctx); | |
632f0d05 | 1532 | dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); |
1da177e4 LT |
1533 | return status; |
1534 | } | |
1535 | ||
1536 | static inline int | |
1537 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1538 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1539 | { |
1540 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1541 | struct xdr_buf integ_buf; | |
1542 | struct xdr_netobj mic; | |
1543 | u32 data_offset, mic_offset; | |
1544 | u32 integ_len; | |
1545 | u32 maj_stat; | |
1546 | int status = -EIO; | |
1547 | ||
1548 | integ_len = ntohl(*(*p)++); | |
1549 | if (integ_len & 3) | |
1550 | return status; | |
1551 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1552 | mic_offset = integ_len + data_offset; | |
1553 | if (mic_offset > rcv_buf->len) | |
1554 | return status; | |
1555 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1556 | return status; | |
1557 | ||
1558 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1559 | mic_offset - data_offset)) | |
1560 | return status; | |
1561 | ||
1562 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1563 | return status; | |
1564 | ||
00fd6e14 | 1565 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1566 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1567 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1568 | if (maj_stat != GSS_S_COMPLETE) |
1569 | return status; | |
1570 | return 0; | |
1571 | } | |
1572 | ||
2d2da60c BF |
1573 | static inline int |
1574 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1575 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1576 | { |
1577 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1578 | u32 offset; | |
1579 | u32 opaque_len; | |
1580 | u32 maj_stat; | |
1581 | int status = -EIO; | |
1582 | ||
1583 | opaque_len = ntohl(*(*p)++); | |
1584 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1585 | if (offset + opaque_len > rcv_buf->len) | |
1586 | return status; | |
1587 | /* remove padding: */ | |
1588 | rcv_buf->len = offset + opaque_len; | |
1589 | ||
00fd6e14 | 1590 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1591 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1592 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1593 | if (maj_stat != GSS_S_COMPLETE) |
1594 | return status; | |
1595 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1596 | return status; | |
1597 | ||
1598 | return 0; | |
1599 | } | |
1600 | ||
bf269551 CL |
1601 | static int |
1602 | gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, | |
1603 | __be32 *p, void *obj) | |
1604 | { | |
1605 | struct xdr_stream xdr; | |
1606 | ||
1607 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
1608 | return decode(rqstp, &xdr, obj); | |
1609 | } | |
2d2da60c | 1610 | |
1da177e4 LT |
1611 | static int |
1612 | gss_unwrap_resp(struct rpc_task *task, | |
bf269551 | 1613 | kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1614 | { |
a17c2153 | 1615 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1616 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1617 | gc_base); | |
1618 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1619 | __be32 *savedp = p; |
2d2da60c BF |
1620 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
1621 | int savedlen = head->iov_len; | |
1da177e4 LT |
1622 | int status = -EIO; |
1623 | ||
1624 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
1625 | goto out_decode; | |
1626 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1627 | case RPC_GSS_SVC_NONE: |
1628 | break; | |
1629 | case RPC_GSS_SVC_INTEGRITY: | |
1630 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
1631 | if (status) | |
1632 | goto out; | |
1633 | break; | |
1634 | case RPC_GSS_SVC_PRIVACY: | |
1635 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); | |
1636 | if (status) | |
1637 | goto out; | |
1638 | break; | |
1da177e4 | 1639 | } |
24b2605b | 1640 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 1641 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 1642 | + (savedlen - head->iov_len); |
1da177e4 | 1643 | out_decode: |
bf269551 | 1644 | status = gss_unwrap_req_decode(decode, rqstp, p, obj); |
1da177e4 LT |
1645 | out: |
1646 | gss_put_ctx(ctx); | |
632f0d05 CL |
1647 | dprintk("RPC: %5u %s returning %d\n", |
1648 | task->tk_pid, __func__, status); | |
1da177e4 LT |
1649 | return status; |
1650 | } | |
cca5172a | 1651 | |
f1c0a861 | 1652 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
1653 | .owner = THIS_MODULE, |
1654 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 1655 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
1656 | .create = gss_create, |
1657 | .destroy = gss_destroy, | |
1658 | .lookup_cred = gss_lookup_cred, | |
80df9d20 SK |
1659 | .crcreate = gss_create_cred, |
1660 | .pipes_create = gss_pipes_dentries_create, | |
1661 | .pipes_destroy = gss_pipes_dentries_destroy, | |
6a1a1e34 | 1662 | .list_pseudoflavors = gss_mech_list_pseudoflavors, |
9568c5e9 | 1663 | .info2flavor = gss_mech_info2flavor, |
a77c806f | 1664 | .flavor2info = gss_mech_flavor2info, |
1da177e4 LT |
1665 | }; |
1666 | ||
f1c0a861 | 1667 | static const struct rpc_credops gss_credops = { |
1da177e4 LT |
1668 | .cr_name = "AUTH_GSS", |
1669 | .crdestroy = gss_destroy_cred, | |
fba3bad4 | 1670 | .cr_init = gss_cred_init, |
5c691044 | 1671 | .crbind = rpcauth_generic_bind_cred, |
1da177e4 LT |
1672 | .crmatch = gss_match, |
1673 | .crmarshal = gss_marshal, | |
1674 | .crrefresh = gss_refresh, | |
1675 | .crvalidate = gss_validate, | |
1676 | .crwrap_req = gss_wrap_req, | |
1677 | .crunwrap_resp = gss_unwrap_resp, | |
1678 | }; | |
1679 | ||
0df7fb74 TM |
1680 | static const struct rpc_credops gss_nullops = { |
1681 | .cr_name = "AUTH_GSS", | |
6dcd3926 | 1682 | .crdestroy = gss_destroy_nullcred, |
5c691044 | 1683 | .crbind = rpcauth_generic_bind_cred, |
0df7fb74 TM |
1684 | .crmatch = gss_match, |
1685 | .crmarshal = gss_marshal, | |
1686 | .crrefresh = gss_refresh_null, | |
1687 | .crvalidate = gss_validate, | |
1688 | .crwrap_req = gss_wrap_req, | |
1689 | .crunwrap_resp = gss_unwrap_resp, | |
1690 | }; | |
1691 | ||
b693ba4a | 1692 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
c1225158 | 1693 | .upcall = rpc_pipe_generic_upcall, |
34769fc4 BF |
1694 | .downcall = gss_pipe_downcall, |
1695 | .destroy_msg = gss_pipe_destroy_msg, | |
1696 | .open_pipe = gss_pipe_open_v0, | |
1697 | .release_pipe = gss_pipe_release, | |
1698 | }; | |
1699 | ||
b693ba4a | 1700 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
c1225158 | 1701 | .upcall = rpc_pipe_generic_upcall, |
1da177e4 LT |
1702 | .downcall = gss_pipe_downcall, |
1703 | .destroy_msg = gss_pipe_destroy_msg, | |
34769fc4 | 1704 | .open_pipe = gss_pipe_open_v1, |
1da177e4 LT |
1705 | .release_pipe = gss_pipe_release, |
1706 | }; | |
1707 | ||
a1db410d SK |
1708 | static __net_init int rpcsec_gss_init_net(struct net *net) |
1709 | { | |
1710 | return gss_svc_init_net(net); | |
1711 | } | |
1712 | ||
1713 | static __net_exit void rpcsec_gss_exit_net(struct net *net) | |
1714 | { | |
1715 | gss_svc_shutdown_net(net); | |
1716 | } | |
1717 | ||
1718 | static struct pernet_operations rpcsec_gss_net_ops = { | |
1719 | .init = rpcsec_gss_init_net, | |
1720 | .exit = rpcsec_gss_exit_net, | |
1721 | }; | |
1722 | ||
1da177e4 LT |
1723 | /* |
1724 | * Initialize RPCSEC_GSS module | |
1725 | */ | |
1726 | static int __init init_rpcsec_gss(void) | |
1727 | { | |
1728 | int err = 0; | |
1729 | ||
1730 | err = rpcauth_register(&authgss_ops); | |
1731 | if (err) | |
1732 | goto out; | |
1733 | err = gss_svc_init(); | |
1734 | if (err) | |
1735 | goto out_unregister; | |
a1db410d SK |
1736 | err = register_pernet_subsys(&rpcsec_gss_net_ops); |
1737 | if (err) | |
1738 | goto out_svc_exit; | |
79a3f20b | 1739 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
1da177e4 | 1740 | return 0; |
a1db410d SK |
1741 | out_svc_exit: |
1742 | gss_svc_shutdown(); | |
1da177e4 LT |
1743 | out_unregister: |
1744 | rpcauth_unregister(&authgss_ops); | |
1745 | out: | |
1746 | return err; | |
1747 | } | |
1748 | ||
1749 | static void __exit exit_rpcsec_gss(void) | |
1750 | { | |
a1db410d | 1751 | unregister_pernet_subsys(&rpcsec_gss_net_ops); |
1da177e4 LT |
1752 | gss_svc_shutdown(); |
1753 | rpcauth_unregister(&authgss_ops); | |
bf12691d | 1754 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1755 | } |
1756 | ||
71afa85e | 1757 | MODULE_ALIAS("rpc-auth-6"); |
1da177e4 | 1758 | MODULE_LICENSE("GPL"); |
126e216a TM |
1759 | module_param_named(expired_cred_retry_delay, |
1760 | gss_expired_cred_retry_delay, | |
1761 | uint, 0644); | |
1762 | MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " | |
1763 | "the RPC engine retries an expired credential"); | |
1764 | ||
1da177e4 LT |
1765 | module_init(init_rpcsec_gss) |
1766 | module_exit(exit_rpcsec_gss) |