Commit | Line | Data |
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2573a464 | 1 | // SPDX-License-Identifier: BSD-3-Clause |
1da177e4 | 2 | /* |
f30c2269 | 3 | * linux/net/sunrpc/auth_gss/auth_gss.c |
1da177e4 LT |
4 | * |
5 | * RPCSEC_GSS client authentication. | |
cca5172a | 6 | * |
1da177e4 LT |
7 | * Copyright (c) 2000 The Regents of the University of Michigan. |
8 | * All rights reserved. | |
9 | * | |
10 | * Dug Song <dugsong@monkey.org> | |
11 | * Andy Adamson <andros@umich.edu> | |
1da177e4 LT |
12 | */ |
13 | ||
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/slab.h> | |
1da177e4 | 18 | #include <linux/sched.h> |
2d2da60c | 19 | #include <linux/pagemap.h> |
1da177e4 LT |
20 | #include <linux/sunrpc/clnt.h> |
21 | #include <linux/sunrpc/auth.h> | |
22 | #include <linux/sunrpc/auth_gss.h> | |
23 | #include <linux/sunrpc/svcauth_gss.h> | |
24 | #include <linux/sunrpc/gss_err.h> | |
25 | #include <linux/workqueue.h> | |
26 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
27 | #include <linux/sunrpc/gss_api.h> | |
7c0f6ba6 | 28 | #include <linux/uaccess.h> |
eb6dc19d | 29 | #include <linux/hashtable.h> |
1da177e4 | 30 | |
abfdbd53 TM |
31 | #include "../netns.h" |
32 | ||
0c77668d CL |
33 | #include <trace/events/rpcgss.h> |
34 | ||
f1c0a861 | 35 | static const struct rpc_authops authgss_ops; |
1da177e4 | 36 | |
f1c0a861 | 37 | static const struct rpc_credops gss_credops; |
0df7fb74 | 38 | static const struct rpc_credops gss_nullops; |
1da177e4 | 39 | |
126e216a TM |
40 | #define GSS_RETRY_EXPIRED 5 |
41 | static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; | |
42 | ||
4de6caa2 AA |
43 | #define GSS_KEY_EXPIRE_TIMEO 240 |
44 | static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO; | |
45 | ||
f895b252 | 46 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
47 | # define RPCDBG_FACILITY RPCDBG_AUTH |
48 | #endif | |
49 | ||
725f2865 | 50 | #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) |
1da177e4 LT |
51 | /* length of a krb5 verifier (48), plus data added before arguments when |
52 | * using integrity (two 4-byte integers): */ | |
adeb8133 | 53 | #define GSS_VERF_SLACK 100 |
1da177e4 | 54 | |
23c323af | 55 | static DEFINE_HASHTABLE(gss_auth_hash_table, 4); |
eb6dc19d TM |
56 | static DEFINE_SPINLOCK(gss_auth_hash_lock); |
57 | ||
19172284 TM |
58 | struct gss_pipe { |
59 | struct rpc_pipe_dir_object pdo; | |
60 | struct rpc_pipe *pipe; | |
61 | struct rpc_clnt *clnt; | |
62 | const char *name; | |
414a6295 | 63 | struct kref kref; |
19172284 TM |
64 | }; |
65 | ||
1da177e4 | 66 | struct gss_auth { |
0285ed1f | 67 | struct kref kref; |
eb6dc19d | 68 | struct hlist_node hash; |
1da177e4 LT |
69 | struct rpc_auth rpc_auth; |
70 | struct gss_api_mech *mech; | |
71 | enum rpc_gss_svc service; | |
1da177e4 | 72 | struct rpc_clnt *client; |
e726340a | 73 | struct net *net; |
34769fc4 BF |
74 | /* |
75 | * There are two upcall pipes; dentry[1], named "gssd", is used | |
76 | * for the new text-based upcall; dentry[0] is named after the | |
77 | * mechanism (for example, "krb5") and exists for | |
78 | * backwards-compatibility with older gssd's. | |
79 | */ | |
19172284 | 80 | struct gss_pipe *gss_pipe[2]; |
bd4a3eb1 | 81 | const char *target_name; |
1da177e4 LT |
82 | }; |
83 | ||
79a3f20b | 84 | /* pipe_version >= 0 if and only if someone has a pipe open. */ |
79a3f20b BF |
85 | static DEFINE_SPINLOCK(pipe_version_lock); |
86 | static struct rpc_wait_queue pipe_version_rpc_waitqueue; | |
87 | static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); | |
9eb2ddb4 | 88 | static void gss_put_auth(struct gss_auth *gss_auth); |
cf81939d | 89 | |
5d28dc82 | 90 | static void gss_free_ctx(struct gss_cl_ctx *); |
b693ba4a TM |
91 | static const struct rpc_pipe_ops gss_upcall_ops_v0; |
92 | static const struct rpc_pipe_ops gss_upcall_ops_v1; | |
1da177e4 | 93 | |
1da177e4 LT |
94 | static inline struct gss_cl_ctx * |
95 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
96 | { | |
0fa10472 | 97 | refcount_inc(&ctx->count); |
1da177e4 LT |
98 | return ctx; |
99 | } | |
100 | ||
101 | static inline void | |
102 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
103 | { | |
0fa10472 | 104 | if (refcount_dec_and_test(&ctx->count)) |
5d28dc82 | 105 | gss_free_ctx(ctx); |
1da177e4 LT |
106 | } |
107 | ||
5d28dc82 TM |
108 | /* gss_cred_set_ctx: |
109 | * called by gss_upcall_callback and gss_create_upcall in order | |
110 | * to set the gss context. The actual exchange of an old context | |
9beae467 | 111 | * and a new one is protected by the pipe->lock. |
5d28dc82 | 112 | */ |
1da177e4 LT |
113 | static void |
114 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
115 | { | |
116 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
5d28dc82 | 117 | |
cd019f75 TM |
118 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
119 | return; | |
7b6962b0 | 120 | gss_get_ctx(ctx); |
cf778b00 | 121 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 | 122 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
4e857c58 | 123 | smp_mb__before_atomic(); |
fc432dd9 | 124 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
1da177e4 LT |
125 | } |
126 | ||
127 | static const void * | |
128 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
129 | { | |
130 | const void *q = (const void *)((const char *)p + len); | |
131 | if (unlikely(q > end || q < p)) | |
132 | return ERR_PTR(-EFAULT); | |
133 | memcpy(res, p, len); | |
134 | return q; | |
135 | } | |
136 | ||
137 | static inline const void * | |
138 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
139 | { | |
140 | const void *q; | |
141 | unsigned int len; | |
142 | ||
143 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
144 | if (IS_ERR(p)) | |
145 | return p; | |
146 | q = (const void *)((const char *)p + len); | |
147 | if (unlikely(q > end || q < p)) | |
148 | return ERR_PTR(-EFAULT); | |
0f38b873 | 149 | dest->data = kmemdup(p, len, GFP_NOFS); |
1da177e4 LT |
150 | if (unlikely(dest->data == NULL)) |
151 | return ERR_PTR(-ENOMEM); | |
152 | dest->len = len; | |
1da177e4 LT |
153 | return q; |
154 | } | |
155 | ||
156 | static struct gss_cl_ctx * | |
157 | gss_cred_get_ctx(struct rpc_cred *cred) | |
158 | { | |
159 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
160 | struct gss_cl_ctx *ctx = NULL; | |
161 | ||
5d28dc82 | 162 | rcu_read_lock(); |
c5e6aecd JL |
163 | ctx = rcu_dereference(gss_cred->gc_ctx); |
164 | if (ctx) | |
165 | gss_get_ctx(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); | |
0fa10472 | 180 | refcount_set(&ctx->count,1); |
1da177e4 LT |
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; | |
620038f6 | 192 | unsigned long now = jiffies; |
1da177e4 LT |
193 | u32 window_size; |
194 | int ret; | |
195 | ||
620038f6 AA |
196 | /* First unsigned int gives the remaining lifetime in seconds of the |
197 | * credential - e.g. the remaining TGT lifetime for Kerberos or | |
198 | * the -t value passed to GSSD. | |
199 | */ | |
1da177e4 LT |
200 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); |
201 | if (IS_ERR(p)) | |
202 | goto err; | |
203 | if (timeout == 0) | |
204 | timeout = GSSD_MIN_TIMEOUT; | |
620038f6 AA |
205 | ctx->gc_expiry = now + ((unsigned long)timeout * HZ); |
206 | /* Sequence number window. Determines the maximum number of | |
207 | * simultaneous requests | |
208 | */ | |
1da177e4 LT |
209 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); |
210 | if (IS_ERR(p)) | |
211 | goto err; | |
212 | ctx->gc_win = window_size; | |
213 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
214 | if (ctx->gc_win == 0) { | |
dc5ddce9 JL |
215 | /* |
216 | * in which case, p points to an error code. Anything other | |
217 | * than -EKEYEXPIRED gets converted to -EACCES. | |
218 | */ | |
219 | p = simple_get_bytes(p, end, &ret, sizeof(ret)); | |
220 | if (!IS_ERR(p)) | |
221 | p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : | |
222 | ERR_PTR(-EACCES); | |
1da177e4 LT |
223 | goto err; |
224 | } | |
225 | /* copy the opaque wire context */ | |
226 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
227 | if (IS_ERR(p)) | |
228 | goto err; | |
229 | /* import the opaque security context */ | |
230 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
231 | if (IS_ERR(p)) | |
232 | goto err; | |
233 | q = (const void *)((const char *)p + seclen); | |
234 | if (unlikely(q > end || q < p)) { | |
235 | p = ERR_PTR(-EFAULT); | |
236 | goto err; | |
237 | } | |
400f26b5 | 238 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); |
1da177e4 | 239 | if (ret < 0) { |
0c77668d | 240 | trace_rpcgss_import_ctx(ret); |
1da177e4 LT |
241 | p = ERR_PTR(ret); |
242 | goto err; | |
243 | } | |
2004c726 JL |
244 | |
245 | /* is there any trailing data? */ | |
246 | if (q == end) { | |
247 | p = q; | |
248 | goto done; | |
249 | } | |
250 | ||
251 | /* pull in acceptor name (if there is one) */ | |
252 | p = simple_get_netobj(q, end, &ctx->gc_acceptor); | |
253 | if (IS_ERR(p)) | |
254 | goto err; | |
255 | done: | |
0c77668d CL |
256 | trace_rpcgss_context(ctx->gc_expiry, now, timeout, |
257 | ctx->gc_acceptor.len, ctx->gc_acceptor.data); | |
1da177e4 | 258 | err: |
1da177e4 LT |
259 | return p; |
260 | } | |
261 | ||
a1a23777 CL |
262 | /* XXX: Need some documentation about why UPCALL_BUF_LEN is so small. |
263 | * Is user space expecting no more than UPCALL_BUF_LEN bytes? | |
264 | * Note that there are now _two_ NI_MAXHOST sized data items | |
265 | * being passed in this string. | |
266 | */ | |
267 | #define UPCALL_BUF_LEN 256 | |
1da177e4 LT |
268 | |
269 | struct gss_upcall_msg { | |
7ff13969 | 270 | refcount_t count; |
7eaf040b | 271 | kuid_t uid; |
ac83228a | 272 | const char *service_name; |
1da177e4 LT |
273 | struct rpc_pipe_msg msg; |
274 | struct list_head list; | |
275 | struct gss_auth *auth; | |
9beae467 | 276 | struct rpc_pipe *pipe; |
1da177e4 LT |
277 | struct rpc_wait_queue rpc_waitqueue; |
278 | wait_queue_head_t waitqueue; | |
279 | struct gss_cl_ctx *ctx; | |
34769fc4 | 280 | char databuf[UPCALL_BUF_LEN]; |
1da177e4 LT |
281 | }; |
282 | ||
2aed8b47 | 283 | static int get_pipe_version(struct net *net) |
79a3f20b | 284 | { |
2aed8b47 | 285 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
79a3f20b BF |
286 | int ret; |
287 | ||
288 | spin_lock(&pipe_version_lock); | |
2aed8b47 TM |
289 | if (sn->pipe_version >= 0) { |
290 | atomic_inc(&sn->pipe_users); | |
291 | ret = sn->pipe_version; | |
79a3f20b BF |
292 | } else |
293 | ret = -EAGAIN; | |
294 | spin_unlock(&pipe_version_lock); | |
295 | return ret; | |
296 | } | |
297 | ||
2aed8b47 | 298 | static void put_pipe_version(struct net *net) |
79a3f20b | 299 | { |
2aed8b47 TM |
300 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
301 | ||
302 | if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { | |
303 | sn->pipe_version = -1; | |
79a3f20b BF |
304 | spin_unlock(&pipe_version_lock); |
305 | } | |
306 | } | |
307 | ||
1da177e4 LT |
308 | static void |
309 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
310 | { | |
e726340a | 311 | struct net *net = gss_msg->auth->net; |
7ff13969 | 312 | if (!refcount_dec_and_test(&gss_msg->count)) |
1da177e4 | 313 | return; |
2aed8b47 | 314 | put_pipe_version(net); |
1da177e4 LT |
315 | BUG_ON(!list_empty(&gss_msg->list)); |
316 | if (gss_msg->ctx != NULL) | |
317 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 318 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
9eb2ddb4 | 319 | gss_put_auth(gss_msg->auth); |
ac83228a | 320 | kfree_const(gss_msg->service_name); |
1da177e4 LT |
321 | kfree(gss_msg); |
322 | } | |
323 | ||
324 | static struct gss_upcall_msg * | |
9130b8db | 325 | __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid, const struct gss_auth *auth) |
1da177e4 LT |
326 | { |
327 | struct gss_upcall_msg *pos; | |
9beae467 | 328 | list_for_each_entry(pos, &pipe->in_downcall, list) { |
0b4d51b0 | 329 | if (!uid_eq(pos->uid, uid)) |
1da177e4 | 330 | continue; |
9130b8db OK |
331 | if (auth && pos->auth->service != auth->service) |
332 | continue; | |
7ff13969 | 333 | refcount_inc(&pos->count); |
1da177e4 LT |
334 | return pos; |
335 | } | |
1da177e4 LT |
336 | return NULL; |
337 | } | |
338 | ||
720b8f2d | 339 | /* Try to add an upcall to the pipefs queue. |
1da177e4 LT |
340 | * If an upcall owned by our uid already exists, then we return a reference |
341 | * to that upcall instead of adding the new upcall. | |
342 | */ | |
343 | static inline struct gss_upcall_msg * | |
053e324f | 344 | gss_add_msg(struct gss_upcall_msg *gss_msg) |
1da177e4 | 345 | { |
9beae467 | 346 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 LT |
347 | struct gss_upcall_msg *old; |
348 | ||
9beae467 | 349 | spin_lock(&pipe->lock); |
9130b8db | 350 | old = __gss_find_upcall(pipe, gss_msg->uid, gss_msg->auth); |
1da177e4 | 351 | if (old == NULL) { |
7ff13969 | 352 | refcount_inc(&gss_msg->count); |
9beae467 | 353 | list_add(&gss_msg->list, &pipe->in_downcall); |
1da177e4 LT |
354 | } else |
355 | gss_msg = old; | |
9beae467 | 356 | spin_unlock(&pipe->lock); |
1da177e4 LT |
357 | return gss_msg; |
358 | } | |
359 | ||
360 | static void | |
361 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
362 | { | |
1da177e4 LT |
363 | list_del_init(&gss_msg->list); |
364 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
365 | wake_up_all(&gss_msg->waitqueue); | |
7ff13969 | 366 | refcount_dec(&gss_msg->count); |
1da177e4 LT |
367 | } |
368 | ||
369 | static void | |
370 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
371 | { | |
9beae467 | 372 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 373 | |
3b68aaea TM |
374 | if (list_empty(&gss_msg->list)) |
375 | return; | |
9beae467 | 376 | spin_lock(&pipe->lock); |
3b68aaea TM |
377 | if (!list_empty(&gss_msg->list)) |
378 | __gss_unhash_msg(gss_msg); | |
9beae467 | 379 | spin_unlock(&pipe->lock); |
1da177e4 LT |
380 | } |
381 | ||
126e216a TM |
382 | static void |
383 | gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) | |
384 | { | |
385 | switch (gss_msg->msg.errno) { | |
386 | case 0: | |
387 | if (gss_msg->ctx == NULL) | |
388 | break; | |
389 | clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
390 | gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); | |
391 | break; | |
392 | case -EKEYEXPIRED: | |
393 | set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
394 | } | |
395 | gss_cred->gc_upcall_timestamp = jiffies; | |
396 | gss_cred->gc_upcall = NULL; | |
397 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
398 | } | |
399 | ||
1da177e4 LT |
400 | static void |
401 | gss_upcall_callback(struct rpc_task *task) | |
402 | { | |
a17c2153 | 403 | struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, |
1da177e4 LT |
404 | struct gss_cred, gc_base); |
405 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
9beae467 | 406 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 407 | |
9beae467 | 408 | spin_lock(&pipe->lock); |
126e216a | 409 | gss_handle_downcall_result(gss_cred, gss_msg); |
9beae467 | 410 | spin_unlock(&pipe->lock); |
126e216a | 411 | task->tk_status = gss_msg->msg.errno; |
1da177e4 LT |
412 | gss_release_msg(gss_msg); |
413 | } | |
414 | ||
ac83228a TM |
415 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg, |
416 | const struct cred *cred) | |
34769fc4 | 417 | { |
ac83228a | 418 | struct user_namespace *userns = cred->user_ns; |
283ebe3e TM |
419 | |
420 | uid_t uid = from_kuid_munged(userns, gss_msg->uid); | |
90602c7b EB |
421 | memcpy(gss_msg->databuf, &uid, sizeof(uid)); |
422 | gss_msg->msg.data = gss_msg->databuf; | |
423 | gss_msg->msg.len = sizeof(uid); | |
9d3a2260 TM |
424 | |
425 | BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf)); | |
34769fc4 BF |
426 | } |
427 | ||
ac83228a TM |
428 | static ssize_t |
429 | gss_v0_upcall(struct file *file, struct rpc_pipe_msg *msg, | |
430 | char __user *buf, size_t buflen) | |
431 | { | |
432 | struct gss_upcall_msg *gss_msg = container_of(msg, | |
433 | struct gss_upcall_msg, | |
434 | msg); | |
435 | if (msg->copied == 0) | |
436 | gss_encode_v0_msg(gss_msg, file->f_cred); | |
437 | return rpc_pipe_generic_upcall(file, msg, buf, buflen); | |
438 | } | |
439 | ||
9d3a2260 | 440 | static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
bd4a3eb1 | 441 | const char *service_name, |
ac83228a TM |
442 | const char *target_name, |
443 | const struct cred *cred) | |
34769fc4 | 444 | { |
ac83228a | 445 | struct user_namespace *userns = cred->user_ns; |
683ac665 | 446 | struct gss_api_mech *mech = gss_msg->auth->mech; |
8b1c7bf5 | 447 | char *p = gss_msg->databuf; |
9d3a2260 TM |
448 | size_t buflen = sizeof(gss_msg->databuf); |
449 | int len; | |
450 | ||
0c77668d | 451 | len = scnprintf(p, buflen, "mech=%s uid=%d", mech->gm_name, |
283ebe3e | 452 | from_kuid_munged(userns, gss_msg->uid)); |
9d3a2260 TM |
453 | buflen -= len; |
454 | p += len; | |
455 | gss_msg->msg.len = len; | |
108b833c CL |
456 | |
457 | /* | |
458 | * target= is a full service principal that names the remote | |
459 | * identity that we are authenticating to. | |
460 | */ | |
bd4a3eb1 | 461 | if (target_name) { |
0c77668d | 462 | len = scnprintf(p, buflen, " target=%s", target_name); |
9d3a2260 | 463 | buflen -= len; |
8b1c7bf5 OK |
464 | p += len; |
465 | gss_msg->msg.len += len; | |
466 | } | |
108b833c CL |
467 | |
468 | /* | |
469 | * gssd uses service= and srchost= to select a matching key from | |
470 | * the system's keytab to use as the source principal. | |
471 | * | |
472 | * service= is the service name part of the source principal, | |
473 | * or "*" (meaning choose any). | |
474 | * | |
475 | * srchost= is the hostname part of the source principal. When | |
476 | * not provided, gssd uses the local hostname. | |
477 | */ | |
a1a23777 CL |
478 | if (service_name) { |
479 | char *c = strchr(service_name, '@'); | |
480 | ||
481 | if (!c) | |
0c77668d | 482 | len = scnprintf(p, buflen, " service=%s", |
a1a23777 CL |
483 | service_name); |
484 | else | |
485 | len = scnprintf(p, buflen, | |
0c77668d | 486 | " service=%.*s srchost=%s", |
a1a23777 CL |
487 | (int)(c - service_name), |
488 | service_name, c + 1); | |
9d3a2260 | 489 | buflen -= len; |
2efef708 OK |
490 | p += len; |
491 | gss_msg->msg.len += len; | |
492 | } | |
108b833c | 493 | |
683ac665 | 494 | if (mech->gm_upcall_enctypes) { |
0c77668d | 495 | len = scnprintf(p, buflen, " enctypes=%s", |
9d3a2260 TM |
496 | mech->gm_upcall_enctypes); |
497 | buflen -= len; | |
683ac665 TM |
498 | p += len; |
499 | gss_msg->msg.len += len; | |
500 | } | |
0c77668d | 501 | trace_rpcgss_upcall_msg(gss_msg->databuf); |
9d3a2260 TM |
502 | len = scnprintf(p, buflen, "\n"); |
503 | if (len == 0) | |
504 | goto out_overflow; | |
8b1c7bf5 | 505 | gss_msg->msg.len += len; |
34769fc4 | 506 | gss_msg->msg.data = gss_msg->databuf; |
9d3a2260 TM |
507 | return 0; |
508 | out_overflow: | |
509 | WARN_ON_ONCE(1); | |
510 | return -ENOMEM; | |
34769fc4 BF |
511 | } |
512 | ||
ac83228a TM |
513 | static ssize_t |
514 | gss_v1_upcall(struct file *file, struct rpc_pipe_msg *msg, | |
515 | char __user *buf, size_t buflen) | |
516 | { | |
517 | struct gss_upcall_msg *gss_msg = container_of(msg, | |
518 | struct gss_upcall_msg, | |
519 | msg); | |
520 | int err; | |
521 | if (msg->copied == 0) { | |
522 | err = gss_encode_v1_msg(gss_msg, | |
523 | gss_msg->service_name, | |
524 | gss_msg->auth->target_name, | |
525 | file->f_cred); | |
526 | if (err) | |
527 | return err; | |
528 | } | |
529 | return rpc_pipe_generic_upcall(file, msg, buf, buflen); | |
530 | } | |
531 | ||
68c97153 | 532 | static struct gss_upcall_msg * |
e726340a | 533 | gss_alloc_msg(struct gss_auth *gss_auth, |
7eaf040b | 534 | kuid_t uid, const char *service_name) |
1da177e4 LT |
535 | { |
536 | struct gss_upcall_msg *gss_msg; | |
79a3f20b | 537 | int vers; |
9d3a2260 | 538 | int err = -ENOMEM; |
1da177e4 | 539 | |
0f38b873 | 540 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
db75b3d6 | 541 | if (gss_msg == NULL) |
9d3a2260 | 542 | goto err; |
e726340a | 543 | vers = get_pipe_version(gss_auth->net); |
9d3a2260 TM |
544 | err = vers; |
545 | if (err < 0) | |
546 | goto err_free_msg; | |
19172284 | 547 | gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe; |
db75b3d6 BF |
548 | INIT_LIST_HEAD(&gss_msg->list); |
549 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
550 | init_waitqueue_head(&gss_msg->waitqueue); | |
7ff13969 | 551 | refcount_set(&gss_msg->count, 1); |
db75b3d6 BF |
552 | gss_msg->uid = uid; |
553 | gss_msg->auth = gss_auth; | |
5940d1cf | 554 | kref_get(&gss_auth->kref); |
ac83228a TM |
555 | if (service_name) { |
556 | gss_msg->service_name = kstrdup_const(service_name, GFP_NOFS); | |
fe31ce83 DC |
557 | if (!gss_msg->service_name) { |
558 | err = -ENOMEM; | |
e9776d0f | 559 | goto err_put_pipe_version; |
fe31ce83 | 560 | } |
07d53ae4 | 561 | } |
1da177e4 | 562 | return gss_msg; |
e9776d0f TM |
563 | err_put_pipe_version: |
564 | put_pipe_version(gss_auth->net); | |
9d3a2260 TM |
565 | err_free_msg: |
566 | kfree(gss_msg); | |
567 | err: | |
568 | return ERR_PTR(err); | |
1da177e4 LT |
569 | } |
570 | ||
571 | static struct gss_upcall_msg * | |
e726340a | 572 | gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred) |
1da177e4 | 573 | { |
7c67db3a TM |
574 | struct gss_cred *gss_cred = container_of(cred, |
575 | struct gss_cred, gc_base); | |
1da177e4 | 576 | struct gss_upcall_msg *gss_new, *gss_msg; |
04d1532b | 577 | kuid_t uid = cred->cr_cred->fsuid; |
1da177e4 | 578 | |
e726340a | 579 | gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal); |
db75b3d6 BF |
580 | if (IS_ERR(gss_new)) |
581 | return gss_new; | |
053e324f | 582 | gss_msg = gss_add_msg(gss_new); |
1da177e4 | 583 | if (gss_msg == gss_new) { |
1cded9d2 | 584 | int res; |
7ff13969 | 585 | refcount_inc(&gss_msg->count); |
1cded9d2 | 586 | res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); |
1da177e4 LT |
587 | if (res) { |
588 | gss_unhash_msg(gss_new); | |
7ff13969 | 589 | refcount_dec(&gss_msg->count); |
1cded9d2 | 590 | gss_release_msg(gss_new); |
1da177e4 LT |
591 | gss_msg = ERR_PTR(res); |
592 | } | |
593 | } else | |
594 | gss_release_msg(gss_new); | |
595 | return gss_msg; | |
596 | } | |
597 | ||
b03568c3 BF |
598 | static void warn_gssd(void) |
599 | { | |
0ea9de0e | 600 | dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n"); |
b03568c3 BF |
601 | } |
602 | ||
1da177e4 LT |
603 | static inline int |
604 | gss_refresh_upcall(struct rpc_task *task) | |
605 | { | |
a17c2153 | 606 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
4a8c1344 | 607 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
608 | struct gss_auth, rpc_auth); |
609 | struct gss_cred *gss_cred = container_of(cred, | |
610 | struct gss_cred, gc_base); | |
611 | struct gss_upcall_msg *gss_msg; | |
9beae467 | 612 | struct rpc_pipe *pipe; |
1da177e4 LT |
613 | int err = 0; |
614 | ||
e726340a | 615 | gss_msg = gss_setup_upcall(gss_auth, cred); |
480e3243 | 616 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
79a3f20b BF |
617 | /* XXX: warning on the first, under the assumption we |
618 | * shouldn't normally hit this case on a refresh. */ | |
619 | warn_gssd(); | |
6b2e6856 TM |
620 | rpc_sleep_on_timeout(&pipe_version_rpc_waitqueue, |
621 | task, NULL, jiffies + (15 * HZ)); | |
0c77668d CL |
622 | err = -EAGAIN; |
623 | goto out; | |
79a3f20b | 624 | } |
1da177e4 LT |
625 | if (IS_ERR(gss_msg)) { |
626 | err = PTR_ERR(gss_msg); | |
627 | goto out; | |
628 | } | |
9beae467 SK |
629 | pipe = gss_msg->pipe; |
630 | spin_lock(&pipe->lock); | |
1da177e4 | 631 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 632 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
126e216a | 633 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
1da177e4 LT |
634 | gss_cred->gc_upcall = gss_msg; |
635 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
7ff13969 | 636 | refcount_inc(&gss_msg->count); |
5d00837b | 637 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
126e216a TM |
638 | } else { |
639 | gss_handle_downcall_result(gss_cred, gss_msg); | |
1da177e4 | 640 | err = gss_msg->msg.errno; |
126e216a | 641 | } |
9beae467 | 642 | spin_unlock(&pipe->lock); |
1da177e4 LT |
643 | gss_release_msg(gss_msg); |
644 | out: | |
0c77668d CL |
645 | trace_rpcgss_upcall_result(from_kuid(&init_user_ns, |
646 | cred->cr_cred->fsuid), err); | |
1da177e4 LT |
647 | return err; |
648 | } | |
649 | ||
650 | static inline int | |
651 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
652 | { | |
e726340a | 653 | struct net *net = gss_auth->net; |
abfdbd53 | 654 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
9beae467 | 655 | struct rpc_pipe *pipe; |
1da177e4 LT |
656 | struct rpc_cred *cred = &gss_cred->gc_base; |
657 | struct gss_upcall_msg *gss_msg; | |
658 | DEFINE_WAIT(wait); | |
d36ccb9c | 659 | int err; |
1da177e4 | 660 | |
79a3f20b | 661 | retry: |
d36ccb9c | 662 | err = 0; |
89f84243 JL |
663 | /* if gssd is down, just skip upcalling altogether */ |
664 | if (!gssd_running(net)) { | |
665 | warn_gssd(); | |
0c77668d CL |
666 | err = -EACCES; |
667 | goto out; | |
89f84243 | 668 | } |
e726340a | 669 | gss_msg = gss_setup_upcall(gss_auth, cred); |
79a3f20b BF |
670 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
671 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, | |
89f84243 | 672 | sn->pipe_version >= 0, 15 * HZ); |
2aed8b47 | 673 | if (sn->pipe_version < 0) { |
d1a8016a BS |
674 | warn_gssd(); |
675 | err = -EACCES; | |
676 | } | |
d36ccb9c | 677 | if (err < 0) |
79a3f20b | 678 | goto out; |
79a3f20b BF |
679 | goto retry; |
680 | } | |
1da177e4 LT |
681 | if (IS_ERR(gss_msg)) { |
682 | err = PTR_ERR(gss_msg); | |
683 | goto out; | |
684 | } | |
9beae467 | 685 | pipe = gss_msg->pipe; |
1da177e4 | 686 | for (;;) { |
5afa9133 | 687 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); |
9beae467 | 688 | spin_lock(&pipe->lock); |
1da177e4 | 689 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
690 | break; |
691 | } | |
9beae467 | 692 | spin_unlock(&pipe->lock); |
5afa9133 | 693 | if (fatal_signal_pending(current)) { |
1da177e4 LT |
694 | err = -ERESTARTSYS; |
695 | goto out_intr; | |
696 | } | |
697 | schedule(); | |
698 | } | |
699 | if (gss_msg->ctx) | |
7b6962b0 | 700 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
701 | else |
702 | err = gss_msg->msg.errno; | |
9beae467 | 703 | spin_unlock(&pipe->lock); |
1da177e4 LT |
704 | out_intr: |
705 | finish_wait(&gss_msg->waitqueue, &wait); | |
706 | gss_release_msg(gss_msg); | |
707 | out: | |
0c77668d CL |
708 | trace_rpcgss_upcall_result(from_kuid(&init_user_ns, |
709 | cred->cr_cred->fsuid), err); | |
1da177e4 LT |
710 | return err; |
711 | } | |
712 | ||
1da177e4 LT |
713 | #define MSG_BUF_MAXSIZE 1024 |
714 | ||
715 | static ssize_t | |
716 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
717 | { | |
718 | const void *p, *end; | |
719 | void *buf; | |
1da177e4 | 720 | struct gss_upcall_msg *gss_msg; |
496ad9aa | 721 | struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; |
1da177e4 | 722 | struct gss_cl_ctx *ctx; |
90602c7b EB |
723 | uid_t id; |
724 | kuid_t uid; | |
3b68aaea | 725 | ssize_t err = -EFBIG; |
1da177e4 LT |
726 | |
727 | if (mlen > MSG_BUF_MAXSIZE) | |
728 | goto out; | |
729 | err = -ENOMEM; | |
0f38b873 | 730 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
731 | if (!buf) |
732 | goto out; | |
733 | ||
1da177e4 LT |
734 | err = -EFAULT; |
735 | if (copy_from_user(buf, src, mlen)) | |
736 | goto err; | |
737 | ||
738 | end = (const void *)((char *)buf + mlen); | |
90602c7b | 739 | p = simple_get_bytes(buf, end, &id, sizeof(id)); |
1da177e4 LT |
740 | if (IS_ERR(p)) { |
741 | err = PTR_ERR(p); | |
742 | goto err; | |
743 | } | |
744 | ||
283ebe3e | 745 | uid = make_kuid(current_user_ns(), id); |
90602c7b EB |
746 | if (!uid_valid(uid)) { |
747 | err = -EINVAL; | |
748 | goto err; | |
749 | } | |
750 | ||
1da177e4 LT |
751 | err = -ENOMEM; |
752 | ctx = gss_alloc_context(); | |
753 | if (ctx == NULL) | |
754 | goto err; | |
3b68aaea TM |
755 | |
756 | err = -ENOENT; | |
757 | /* Find a matching upcall */ | |
9beae467 | 758 | spin_lock(&pipe->lock); |
9130b8db | 759 | gss_msg = __gss_find_upcall(pipe, uid, NULL); |
3b68aaea | 760 | if (gss_msg == NULL) { |
9beae467 | 761 | spin_unlock(&pipe->lock); |
3b68aaea TM |
762 | goto err_put_ctx; |
763 | } | |
764 | list_del_init(&gss_msg->list); | |
9beae467 | 765 | spin_unlock(&pipe->lock); |
3b68aaea | 766 | |
6e84c7b6 | 767 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
768 | if (IS_ERR(p)) { |
769 | err = PTR_ERR(p); | |
486bad2e JL |
770 | switch (err) { |
771 | case -EACCES: | |
dc5ddce9 | 772 | case -EKEYEXPIRED: |
486bad2e JL |
773 | gss_msg->msg.errno = err; |
774 | err = mlen; | |
775 | break; | |
776 | case -EFAULT: | |
777 | case -ENOMEM: | |
778 | case -EINVAL: | |
779 | case -ENOSYS: | |
780 | gss_msg->msg.errno = -EAGAIN; | |
781 | break; | |
782 | default: | |
783 | printk(KERN_CRIT "%s: bad return from " | |
6c853099 | 784 | "gss_fill_context: %zd\n", __func__, err); |
437b300c | 785 | gss_msg->msg.errno = -EIO; |
486bad2e | 786 | } |
3b68aaea | 787 | goto err_release_msg; |
1da177e4 | 788 | } |
3b68aaea TM |
789 | gss_msg->ctx = gss_get_ctx(ctx); |
790 | err = mlen; | |
791 | ||
792 | err_release_msg: | |
9beae467 | 793 | spin_lock(&pipe->lock); |
3b68aaea | 794 | __gss_unhash_msg(gss_msg); |
9beae467 | 795 | spin_unlock(&pipe->lock); |
3b68aaea | 796 | gss_release_msg(gss_msg); |
1da177e4 LT |
797 | err_put_ctx: |
798 | gss_put_ctx(ctx); | |
799 | err: | |
800 | kfree(buf); | |
801 | out: | |
1da177e4 LT |
802 | return err; |
803 | } | |
804 | ||
34769fc4 | 805 | static int gss_pipe_open(struct inode *inode, int new_version) |
cf81939d | 806 | { |
2aed8b47 TM |
807 | struct net *net = inode->i_sb->s_fs_info; |
808 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
34769fc4 BF |
809 | int ret = 0; |
810 | ||
79a3f20b | 811 | spin_lock(&pipe_version_lock); |
2aed8b47 | 812 | if (sn->pipe_version < 0) { |
34769fc4 | 813 | /* First open of any gss pipe determines the version: */ |
2aed8b47 | 814 | sn->pipe_version = new_version; |
79a3f20b BF |
815 | rpc_wake_up(&pipe_version_rpc_waitqueue); |
816 | wake_up(&pipe_version_waitqueue); | |
2aed8b47 | 817 | } else if (sn->pipe_version != new_version) { |
34769fc4 BF |
818 | /* Trying to open a pipe of a different version */ |
819 | ret = -EBUSY; | |
820 | goto out; | |
79a3f20b | 821 | } |
2aed8b47 | 822 | atomic_inc(&sn->pipe_users); |
34769fc4 | 823 | out: |
79a3f20b | 824 | spin_unlock(&pipe_version_lock); |
34769fc4 BF |
825 | return ret; |
826 | ||
827 | } | |
828 | ||
829 | static int gss_pipe_open_v0(struct inode *inode) | |
830 | { | |
831 | return gss_pipe_open(inode, 0); | |
832 | } | |
833 | ||
834 | static int gss_pipe_open_v1(struct inode *inode) | |
835 | { | |
836 | return gss_pipe_open(inode, 1); | |
cf81939d BF |
837 | } |
838 | ||
1da177e4 LT |
839 | static void |
840 | gss_pipe_release(struct inode *inode) | |
841 | { | |
2aed8b47 | 842 | struct net *net = inode->i_sb->s_fs_info; |
9beae467 | 843 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
6e84c7b6 | 844 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 845 | |
5a67657a | 846 | restart: |
9beae467 SK |
847 | spin_lock(&pipe->lock); |
848 | list_for_each_entry(gss_msg, &pipe->in_downcall, list) { | |
1da177e4 | 849 | |
5a67657a TM |
850 | if (!list_empty(&gss_msg->msg.list)) |
851 | continue; | |
1da177e4 | 852 | gss_msg->msg.errno = -EPIPE; |
7ff13969 | 853 | refcount_inc(&gss_msg->count); |
1da177e4 | 854 | __gss_unhash_msg(gss_msg); |
9beae467 | 855 | spin_unlock(&pipe->lock); |
1da177e4 | 856 | gss_release_msg(gss_msg); |
5a67657a | 857 | goto restart; |
1da177e4 | 858 | } |
9beae467 | 859 | spin_unlock(&pipe->lock); |
cf81939d | 860 | |
2aed8b47 | 861 | put_pipe_version(net); |
1da177e4 LT |
862 | } |
863 | ||
864 | static void | |
865 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
866 | { | |
867 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
1da177e4 LT |
868 | |
869 | if (msg->errno < 0) { | |
7ff13969 | 870 | refcount_inc(&gss_msg->count); |
1da177e4 | 871 | gss_unhash_msg(gss_msg); |
b03568c3 BF |
872 | if (msg->errno == -ETIMEDOUT) |
873 | warn_gssd(); | |
1da177e4 LT |
874 | gss_release_msg(gss_msg); |
875 | } | |
1cded9d2 | 876 | gss_release_msg(gss_msg); |
1da177e4 LT |
877 | } |
878 | ||
19172284 TM |
879 | static void gss_pipe_dentry_destroy(struct dentry *dir, |
880 | struct rpc_pipe_dir_object *pdo) | |
ccdc28f8 | 881 | { |
19172284 TM |
882 | struct gss_pipe *gss_pipe = pdo->pdo_data; |
883 | struct rpc_pipe *pipe = gss_pipe->pipe; | |
ccdc28f8 | 884 | |
19172284 TM |
885 | if (pipe->dentry != NULL) { |
886 | rpc_unlink(pipe->dentry); | |
887 | pipe->dentry = NULL; | |
6b2fddd3 | 888 | } |
ccdc28f8 SK |
889 | } |
890 | ||
19172284 TM |
891 | static int gss_pipe_dentry_create(struct dentry *dir, |
892 | struct rpc_pipe_dir_object *pdo) | |
ccdc28f8 | 893 | { |
19172284 | 894 | struct gss_pipe *p = pdo->pdo_data; |
6b2fddd3 | 895 | struct dentry *dentry; |
ccdc28f8 | 896 | |
19172284 TM |
897 | dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe); |
898 | if (IS_ERR(dentry)) | |
899 | return PTR_ERR(dentry); | |
900 | p->pipe->dentry = dentry; | |
901 | return 0; | |
902 | } | |
903 | ||
904 | static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = { | |
905 | .create = gss_pipe_dentry_create, | |
906 | .destroy = gss_pipe_dentry_destroy, | |
907 | }; | |
908 | ||
909 | static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt, | |
910 | const char *name, | |
911 | const struct rpc_pipe_ops *upcall_ops) | |
912 | { | |
19172284 TM |
913 | struct gss_pipe *p; |
914 | int err = -ENOMEM; | |
ccdc28f8 | 915 | |
19172284 TM |
916 | p = kmalloc(sizeof(*p), GFP_KERNEL); |
917 | if (p == NULL) | |
6b2fddd3 | 918 | goto err; |
19172284 TM |
919 | p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); |
920 | if (IS_ERR(p->pipe)) { | |
921 | err = PTR_ERR(p->pipe); | |
922 | goto err_free_gss_pipe; | |
6b2fddd3 | 923 | } |
19172284 TM |
924 | p->name = name; |
925 | p->clnt = clnt; | |
414a6295 | 926 | kref_init(&p->kref); |
19172284 TM |
927 | rpc_init_pipe_dir_object(&p->pdo, |
928 | &gss_pipe_dir_object_ops, | |
929 | p); | |
414a6295 | 930 | return p; |
19172284 TM |
931 | err_free_gss_pipe: |
932 | kfree(p); | |
6b2fddd3 | 933 | err: |
19172284 | 934 | return ERR_PTR(err); |
ccdc28f8 SK |
935 | } |
936 | ||
414a6295 TM |
937 | struct gss_alloc_pdo { |
938 | struct rpc_clnt *clnt; | |
939 | const char *name; | |
940 | const struct rpc_pipe_ops *upcall_ops; | |
941 | }; | |
942 | ||
943 | static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data) | |
944 | { | |
945 | struct gss_pipe *gss_pipe; | |
946 | struct gss_alloc_pdo *args = data; | |
947 | ||
948 | if (pdo->pdo_ops != &gss_pipe_dir_object_ops) | |
949 | return 0; | |
950 | gss_pipe = container_of(pdo, struct gss_pipe, pdo); | |
951 | if (strcmp(gss_pipe->name, args->name) != 0) | |
952 | return 0; | |
953 | if (!kref_get_unless_zero(&gss_pipe->kref)) | |
954 | return 0; | |
955 | return 1; | |
956 | } | |
957 | ||
958 | static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data) | |
959 | { | |
960 | struct gss_pipe *gss_pipe; | |
961 | struct gss_alloc_pdo *args = data; | |
962 | ||
963 | gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops); | |
964 | if (!IS_ERR(gss_pipe)) | |
965 | return &gss_pipe->pdo; | |
966 | return NULL; | |
967 | } | |
968 | ||
969 | static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt, | |
970 | const char *name, | |
971 | const struct rpc_pipe_ops *upcall_ops) | |
972 | { | |
973 | struct net *net = rpc_net_ns(clnt); | |
974 | struct rpc_pipe_dir_object *pdo; | |
975 | struct gss_alloc_pdo args = { | |
976 | .clnt = clnt, | |
977 | .name = name, | |
978 | .upcall_ops = upcall_ops, | |
979 | }; | |
980 | ||
981 | pdo = rpc_find_or_alloc_pipe_dir_object(net, | |
982 | &clnt->cl_pipedir_objects, | |
983 | gss_pipe_match_pdo, | |
984 | gss_pipe_alloc_pdo, | |
985 | &args); | |
986 | if (pdo != NULL) | |
987 | return container_of(pdo, struct gss_pipe, pdo); | |
988 | return ERR_PTR(-ENOMEM); | |
989 | } | |
990 | ||
19172284 | 991 | static void __gss_pipe_free(struct gss_pipe *p) |
ccdc28f8 | 992 | { |
19172284 TM |
993 | struct rpc_clnt *clnt = p->clnt; |
994 | struct net *net = rpc_net_ns(clnt); | |
ccdc28f8 | 995 | |
19172284 TM |
996 | rpc_remove_pipe_dir_object(net, |
997 | &clnt->cl_pipedir_objects, | |
998 | &p->pdo); | |
999 | rpc_destroy_pipe_data(p->pipe); | |
1000 | kfree(p); | |
ccdc28f8 SK |
1001 | } |
1002 | ||
414a6295 TM |
1003 | static void __gss_pipe_release(struct kref *kref) |
1004 | { | |
1005 | struct gss_pipe *p = container_of(kref, struct gss_pipe, kref); | |
1006 | ||
1007 | __gss_pipe_free(p); | |
1008 | } | |
1009 | ||
19172284 | 1010 | static void gss_pipe_free(struct gss_pipe *p) |
ccdc28f8 | 1011 | { |
19172284 | 1012 | if (p != NULL) |
414a6295 | 1013 | kref_put(&p->kref, __gss_pipe_release); |
ccdc28f8 SK |
1014 | } |
1015 | ||
cca5172a YH |
1016 | /* |
1017 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
1018 | * parameters based on the input flavor (which must be a pseudoflavor) |
1019 | */ | |
eb6dc19d | 1020 | static struct gss_auth * |
82b98ca5 | 1021 | gss_create_new(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
1da177e4 | 1022 | { |
c2190661 | 1023 | rpc_authflavor_t flavor = args->pseudoflavor; |
1da177e4 | 1024 | struct gss_auth *gss_auth; |
19172284 | 1025 | struct gss_pipe *gss_pipe; |
1da177e4 | 1026 | struct rpc_auth * auth; |
6a19275a | 1027 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 1028 | |
1da177e4 | 1029 | if (!try_module_get(THIS_MODULE)) |
6a19275a | 1030 | return ERR_PTR(err); |
1da177e4 LT |
1031 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
1032 | goto out_dec; | |
eb6dc19d | 1033 | INIT_HLIST_NODE(&gss_auth->hash); |
bd4a3eb1 | 1034 | gss_auth->target_name = NULL; |
c2190661 TM |
1035 | if (args->target_name) { |
1036 | gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL); | |
bd4a3eb1 TM |
1037 | if (gss_auth->target_name == NULL) |
1038 | goto err_free; | |
1039 | } | |
1da177e4 | 1040 | gss_auth->client = clnt; |
e726340a | 1041 | gss_auth->net = get_net(rpc_net_ns(clnt)); |
6a19275a | 1042 | err = -EINVAL; |
1da177e4 | 1043 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
0c77668d | 1044 | if (!gss_auth->mech) |
e726340a | 1045 | goto err_put_net; |
1da177e4 | 1046 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); |
438b6fde BF |
1047 | if (gss_auth->service == 0) |
1048 | goto err_put_mech; | |
a699d65e TM |
1049 | if (!gssd_running(gss_auth->net)) |
1050 | goto err_put_mech; | |
1da177e4 LT |
1051 | auth = &gss_auth->rpc_auth; |
1052 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
1053 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
a00275ba | 1054 | auth->au_verfsize = GSS_VERF_SLACK >> 2; |
35e77d21 | 1055 | auth->au_ralign = GSS_VERF_SLACK >> 2; |
ce52914e | 1056 | auth->au_flags = 0; |
1da177e4 LT |
1057 | auth->au_ops = &authgss_ops; |
1058 | auth->au_flavor = flavor; | |
65b80179 CL |
1059 | if (gss_pseudoflavor_to_datatouch(gss_auth->mech, flavor)) |
1060 | auth->au_flags |= RPCAUTH_AUTH_DATATOUCH; | |
331bc71c | 1061 | refcount_set(&auth->au_count, 1); |
0285ed1f | 1062 | kref_init(&gss_auth->kref); |
1da177e4 | 1063 | |
19172284 TM |
1064 | err = rpcauth_init_credcache(auth); |
1065 | if (err) | |
1066 | goto err_put_mech; | |
34769fc4 BF |
1067 | /* |
1068 | * Note: if we created the old pipe first, then someone who | |
1069 | * examined the directory at the right moment might conclude | |
1070 | * that we supported only the old pipe. So we instead create | |
1071 | * the new pipe first. | |
1072 | */ | |
414a6295 | 1073 | gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1); |
19172284 TM |
1074 | if (IS_ERR(gss_pipe)) { |
1075 | err = PTR_ERR(gss_pipe); | |
1076 | goto err_destroy_credcache; | |
6a19275a | 1077 | } |
19172284 | 1078 | gss_auth->gss_pipe[1] = gss_pipe; |
1da177e4 | 1079 | |
414a6295 | 1080 | gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name, |
19172284 TM |
1081 | &gss_upcall_ops_v0); |
1082 | if (IS_ERR(gss_pipe)) { | |
1083 | err = PTR_ERR(gss_pipe); | |
c239d83b SK |
1084 | goto err_destroy_pipe_1; |
1085 | } | |
19172284 | 1086 | gss_auth->gss_pipe[0] = gss_pipe; |
07a2bf1d | 1087 | |
eb6dc19d | 1088 | return gss_auth; |
c239d83b | 1089 | err_destroy_pipe_1: |
414a6295 | 1090 | gss_pipe_free(gss_auth->gss_pipe[1]); |
19172284 TM |
1091 | err_destroy_credcache: |
1092 | rpcauth_destroy_credcache(auth); | |
1da177e4 LT |
1093 | err_put_mech: |
1094 | gss_mech_put(gss_auth->mech); | |
e726340a TM |
1095 | err_put_net: |
1096 | put_net(gss_auth->net); | |
1da177e4 | 1097 | err_free: |
bd4a3eb1 | 1098 | kfree(gss_auth->target_name); |
1da177e4 LT |
1099 | kfree(gss_auth); |
1100 | out_dec: | |
1101 | module_put(THIS_MODULE); | |
0c77668d | 1102 | trace_rpcgss_createauth(flavor, err); |
6a19275a | 1103 | return ERR_PTR(err); |
1da177e4 LT |
1104 | } |
1105 | ||
0285ed1f TM |
1106 | static void |
1107 | gss_free(struct gss_auth *gss_auth) | |
1108 | { | |
19172284 TM |
1109 | gss_pipe_free(gss_auth->gss_pipe[0]); |
1110 | gss_pipe_free(gss_auth->gss_pipe[1]); | |
0285ed1f | 1111 | gss_mech_put(gss_auth->mech); |
e726340a | 1112 | put_net(gss_auth->net); |
bd4a3eb1 | 1113 | kfree(gss_auth->target_name); |
0285ed1f TM |
1114 | |
1115 | kfree(gss_auth); | |
1116 | module_put(THIS_MODULE); | |
1117 | } | |
1118 | ||
1119 | static void | |
1120 | gss_free_callback(struct kref *kref) | |
1121 | { | |
1122 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
1123 | ||
1124 | gss_free(gss_auth); | |
1125 | } | |
1126 | ||
9eb2ddb4 TM |
1127 | static void |
1128 | gss_put_auth(struct gss_auth *gss_auth) | |
1129 | { | |
1130 | kref_put(&gss_auth->kref, gss_free_callback); | |
1131 | } | |
1132 | ||
1da177e4 LT |
1133 | static void |
1134 | gss_destroy(struct rpc_auth *auth) | |
1135 | { | |
19172284 TM |
1136 | struct gss_auth *gss_auth = container_of(auth, |
1137 | struct gss_auth, rpc_auth); | |
1da177e4 | 1138 | |
eb6dc19d TM |
1139 | if (hash_hashed(&gss_auth->hash)) { |
1140 | spin_lock(&gss_auth_hash_lock); | |
1141 | hash_del(&gss_auth->hash); | |
1142 | spin_unlock(&gss_auth_hash_lock); | |
1143 | } | |
1144 | ||
19172284 TM |
1145 | gss_pipe_free(gss_auth->gss_pipe[0]); |
1146 | gss_auth->gss_pipe[0] = NULL; | |
1147 | gss_pipe_free(gss_auth->gss_pipe[1]); | |
1148 | gss_auth->gss_pipe[1] = NULL; | |
3ab9bb72 TM |
1149 | rpcauth_destroy_credcache(auth); |
1150 | ||
9eb2ddb4 | 1151 | gss_put_auth(gss_auth); |
1da177e4 LT |
1152 | } |
1153 | ||
a0f6ed8e BF |
1154 | /* |
1155 | * Auths may be shared between rpc clients that were cloned from a | |
1156 | * common client with the same xprt, if they also share the flavor and | |
1157 | * target_name. | |
1158 | * | |
1159 | * The auth is looked up from the oldest parent sharing the same | |
1160 | * cl_xprt, and the auth itself references only that common parent | |
1161 | * (which is guaranteed to last as long as any of its descendants). | |
1162 | */ | |
eb6dc19d | 1163 | static struct gss_auth * |
82b98ca5 | 1164 | gss_auth_find_or_add_hashed(const struct rpc_auth_create_args *args, |
eb6dc19d TM |
1165 | struct rpc_clnt *clnt, |
1166 | struct gss_auth *new) | |
1167 | { | |
1168 | struct gss_auth *gss_auth; | |
1169 | unsigned long hashval = (unsigned long)clnt; | |
1170 | ||
1171 | spin_lock(&gss_auth_hash_lock); | |
1172 | hash_for_each_possible(gss_auth_hash_table, | |
1173 | gss_auth, | |
1174 | hash, | |
1175 | hashval) { | |
a0f6ed8e BF |
1176 | if (gss_auth->client != clnt) |
1177 | continue; | |
eb6dc19d TM |
1178 | if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor) |
1179 | continue; | |
1180 | if (gss_auth->target_name != args->target_name) { | |
1181 | if (gss_auth->target_name == NULL) | |
1182 | continue; | |
1183 | if (args->target_name == NULL) | |
1184 | continue; | |
1185 | if (strcmp(gss_auth->target_name, args->target_name)) | |
1186 | continue; | |
1187 | } | |
331bc71c | 1188 | if (!refcount_inc_not_zero(&gss_auth->rpc_auth.au_count)) |
eb6dc19d TM |
1189 | continue; |
1190 | goto out; | |
1191 | } | |
1192 | if (new) | |
1193 | hash_add(gss_auth_hash_table, &new->hash, hashval); | |
1194 | gss_auth = new; | |
1195 | out: | |
1196 | spin_unlock(&gss_auth_hash_lock); | |
1197 | return gss_auth; | |
1198 | } | |
1199 | ||
1200 | static struct gss_auth * | |
82b98ca5 SD |
1201 | gss_create_hashed(const struct rpc_auth_create_args *args, |
1202 | struct rpc_clnt *clnt) | |
eb6dc19d TM |
1203 | { |
1204 | struct gss_auth *gss_auth; | |
1205 | struct gss_auth *new; | |
1206 | ||
1207 | gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL); | |
1208 | if (gss_auth != NULL) | |
1209 | goto out; | |
1210 | new = gss_create_new(args, clnt); | |
1211 | if (IS_ERR(new)) | |
1212 | return new; | |
1213 | gss_auth = gss_auth_find_or_add_hashed(args, clnt, new); | |
1214 | if (gss_auth != new) | |
1215 | gss_destroy(&new->rpc_auth); | |
1216 | out: | |
1217 | return gss_auth; | |
1218 | } | |
1219 | ||
1220 | static struct rpc_auth * | |
82b98ca5 | 1221 | gss_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
eb6dc19d TM |
1222 | { |
1223 | struct gss_auth *gss_auth; | |
ad01b2c6 | 1224 | struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch); |
eb6dc19d TM |
1225 | |
1226 | while (clnt != clnt->cl_parent) { | |
1227 | struct rpc_clnt *parent = clnt->cl_parent; | |
1228 | /* Find the original parent for this transport */ | |
ad01b2c6 | 1229 | if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps) |
eb6dc19d TM |
1230 | break; |
1231 | clnt = parent; | |
1232 | } | |
1233 | ||
1234 | gss_auth = gss_create_hashed(args, clnt); | |
1235 | if (IS_ERR(gss_auth)) | |
1236 | return ERR_CAST(gss_auth); | |
1237 | return &gss_auth->rpc_auth; | |
1238 | } | |
1239 | ||
a652a4bc TM |
1240 | static struct gss_cred * |
1241 | gss_dup_cred(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
1242 | { | |
1243 | struct gss_cred *new; | |
1244 | ||
1245 | /* Make a copy of the cred so that we can reference count it */ | |
12a3ad61 | 1246 | new = kzalloc(sizeof(*gss_cred), GFP_NOFS); |
a652a4bc TM |
1247 | if (new) { |
1248 | struct auth_cred acred = { | |
8276c902 | 1249 | .cred = gss_cred->gc_base.cr_cred, |
a652a4bc TM |
1250 | }; |
1251 | struct gss_cl_ctx *ctx = | |
1252 | rcu_dereference_protected(gss_cred->gc_ctx, 1); | |
1253 | ||
1254 | rpcauth_init_cred(&new->gc_base, &acred, | |
1255 | &gss_auth->rpc_auth, | |
1256 | &gss_nullops); | |
1257 | new->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE; | |
1258 | new->gc_service = gss_cred->gc_service; | |
1259 | new->gc_principal = gss_cred->gc_principal; | |
1260 | kref_get(&gss_auth->kref); | |
1261 | rcu_assign_pointer(new->gc_ctx, ctx); | |
1262 | gss_get_ctx(ctx); | |
1263 | } | |
1264 | return new; | |
1265 | } | |
1266 | ||
0df7fb74 | 1267 | /* |
a652a4bc | 1268 | * gss_send_destroy_context will cause the RPCSEC_GSS to send a NULL RPC call |
0df7fb74 TM |
1269 | * to the server with the GSS control procedure field set to |
1270 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
1271 | * all RPCSEC_GSS state associated with that context. | |
1272 | */ | |
a652a4bc TM |
1273 | static void |
1274 | gss_send_destroy_context(struct rpc_cred *cred) | |
0df7fb74 TM |
1275 | { |
1276 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1277 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
c5e6aecd | 1278 | struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1); |
a652a4bc | 1279 | struct gss_cred *new; |
0df7fb74 TM |
1280 | struct rpc_task *task; |
1281 | ||
a652a4bc TM |
1282 | new = gss_dup_cred(gss_auth, gss_cred); |
1283 | if (new) { | |
1284 | ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
0df7fb74 | 1285 | |
a652a4bc TM |
1286 | task = rpc_call_null(gss_auth->client, &new->gc_base, |
1287 | RPC_TASK_ASYNC|RPC_TASK_SOFT); | |
1288 | if (!IS_ERR(task)) | |
1289 | rpc_put_task(task); | |
0df7fb74 | 1290 | |
a652a4bc TM |
1291 | put_rpccred(&new->gc_base); |
1292 | } | |
0df7fb74 TM |
1293 | } |
1294 | ||
1295 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
1296 | * to create a new cred or context, so they check that things have been |
1297 | * allocated before freeing them. */ | |
1298 | static void | |
5d28dc82 | 1299 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 1300 | { |
0d8a3746 | 1301 | gss_delete_sec_context(&ctx->gc_gss_ctx); |
1da177e4 | 1302 | kfree(ctx->gc_wire_ctx.data); |
2004c726 | 1303 | kfree(ctx->gc_acceptor.data); |
1da177e4 LT |
1304 | kfree(ctx); |
1305 | } | |
1306 | ||
5d28dc82 TM |
1307 | static void |
1308 | gss_free_ctx_callback(struct rcu_head *head) | |
1309 | { | |
1310 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
1311 | gss_do_free_ctx(ctx); | |
1312 | } | |
1313 | ||
1314 | static void | |
1315 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
1316 | { | |
1317 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); | |
1318 | } | |
1319 | ||
1da177e4 | 1320 | static void |
31be5bf1 | 1321 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 1322 | { |
31be5bf1 TM |
1323 | kfree(gss_cred); |
1324 | } | |
1da177e4 | 1325 | |
31be5bf1 TM |
1326 | static void |
1327 | gss_free_cred_callback(struct rcu_head *head) | |
1328 | { | |
1329 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
1330 | gss_free_cred(gss_cred); | |
1331 | } | |
1da177e4 | 1332 | |
31be5bf1 | 1333 | static void |
6dcd3926 | 1334 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 1335 | { |
5d28dc82 | 1336 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 1337 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
c5e6aecd | 1338 | struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1); |
5d28dc82 | 1339 | |
a9b3cd7f | 1340 | RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); |
97f68c6b | 1341 | put_cred(cred->cr_cred); |
31be5bf1 | 1342 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
1343 | if (ctx) |
1344 | gss_put_ctx(ctx); | |
9eb2ddb4 | 1345 | gss_put_auth(gss_auth); |
1da177e4 LT |
1346 | } |
1347 | ||
6dcd3926 JL |
1348 | static void |
1349 | gss_destroy_cred(struct rpc_cred *cred) | |
1350 | { | |
1351 | ||
a652a4bc TM |
1352 | if (test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) |
1353 | gss_send_destroy_context(cred); | |
6dcd3926 JL |
1354 | gss_destroy_nullcred(cred); |
1355 | } | |
1356 | ||
a960f8d6 FS |
1357 | static int |
1358 | gss_hash_cred(struct auth_cred *acred, unsigned int hashbits) | |
1359 | { | |
8276c902 | 1360 | return hash_64(from_kuid(&init_user_ns, acred->cred->fsuid), hashbits); |
a960f8d6 FS |
1361 | } |
1362 | ||
1da177e4 LT |
1363 | /* |
1364 | * Lookup RPCSEC_GSS cred for the current process | |
1365 | */ | |
1366 | static struct rpc_cred * | |
8a317760 | 1367 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 1368 | { |
3c6e0bc8 | 1369 | return rpcauth_lookup_credcache(auth, acred, flags, GFP_NOFS); |
1da177e4 LT |
1370 | } |
1371 | ||
1372 | static struct rpc_cred * | |
3c6e0bc8 | 1373 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp) |
1da177e4 LT |
1374 | { |
1375 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1376 | struct gss_cred *cred = NULL; | |
1377 | int err = -ENOMEM; | |
1378 | ||
3c6e0bc8 | 1379 | if (!(cred = kzalloc(sizeof(*cred), gfp))) |
1da177e4 LT |
1380 | goto out_err; |
1381 | ||
5fe4755e | 1382 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
1383 | /* |
1384 | * Note: in order to force a call to call_refresh(), we deliberately | |
1385 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
1386 | */ | |
fc432dd9 | 1387 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 1388 | cred->gc_service = gss_auth->service; |
1a80810f | 1389 | cred->gc_principal = acred->principal; |
0285ed1f | 1390 | kref_get(&gss_auth->kref); |
1da177e4 LT |
1391 | return &cred->gc_base; |
1392 | ||
1393 | out_err: | |
1da177e4 LT |
1394 | return ERR_PTR(err); |
1395 | } | |
1396 | ||
fba3bad4 TM |
1397 | static int |
1398 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
1399 | { | |
1400 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1401 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
1402 | int err; | |
1403 | ||
1404 | do { | |
1405 | err = gss_create_upcall(gss_auth, gss_cred); | |
1406 | } while (err == -EAGAIN); | |
1407 | return err; | |
1408 | } | |
1409 | ||
a0337d1d JL |
1410 | static char * |
1411 | gss_stringify_acceptor(struct rpc_cred *cred) | |
1412 | { | |
c5e6aecd | 1413 | char *string = NULL; |
a0337d1d | 1414 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
c5e6aecd | 1415 | struct gss_cl_ctx *ctx; |
b3ecba09 | 1416 | unsigned int len; |
c5e6aecd JL |
1417 | struct xdr_netobj *acceptor; |
1418 | ||
1419 | rcu_read_lock(); | |
1420 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
1421 | if (!ctx) | |
1422 | goto out; | |
1423 | ||
b3ecba09 JL |
1424 | len = ctx->gc_acceptor.len; |
1425 | rcu_read_unlock(); | |
a0337d1d JL |
1426 | |
1427 | /* no point if there's no string */ | |
b3ecba09 JL |
1428 | if (!len) |
1429 | return NULL; | |
1430 | realloc: | |
1431 | string = kmalloc(len + 1, GFP_KERNEL); | |
a0337d1d | 1432 | if (!string) |
b3ecba09 JL |
1433 | return NULL; |
1434 | ||
1435 | rcu_read_lock(); | |
1436 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
1437 | ||
1438 | /* did the ctx disappear or was it replaced by one with no acceptor? */ | |
1439 | if (!ctx || !ctx->gc_acceptor.len) { | |
1440 | kfree(string); | |
1441 | string = NULL; | |
c5e6aecd | 1442 | goto out; |
b3ecba09 JL |
1443 | } |
1444 | ||
1445 | acceptor = &ctx->gc_acceptor; | |
1446 | ||
1447 | /* | |
1448 | * Did we find a new acceptor that's longer than the original? Allocate | |
1449 | * a longer buffer and try again. | |
1450 | */ | |
1451 | if (len < acceptor->len) { | |
1452 | len = acceptor->len; | |
1453 | rcu_read_unlock(); | |
1454 | kfree(string); | |
1455 | goto realloc; | |
1456 | } | |
a0337d1d JL |
1457 | |
1458 | memcpy(string, acceptor->data, acceptor->len); | |
1459 | string[acceptor->len] = '\0'; | |
c5e6aecd JL |
1460 | out: |
1461 | rcu_read_unlock(); | |
a0337d1d JL |
1462 | return string; |
1463 | } | |
1464 | ||
4de6caa2 AA |
1465 | /* |
1466 | * Returns -EACCES if GSS context is NULL or will expire within the | |
1467 | * timeout (miliseconds) | |
1468 | */ | |
1469 | static int | |
1470 | gss_key_timeout(struct rpc_cred *rc) | |
1471 | { | |
1472 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
c5e6aecd | 1473 | struct gss_cl_ctx *ctx; |
cc6a7aab AB |
1474 | unsigned long timeout = jiffies + (gss_key_expire_timeo * HZ); |
1475 | int ret = 0; | |
4de6caa2 | 1476 | |
c5e6aecd JL |
1477 | rcu_read_lock(); |
1478 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
cc6a7aab AB |
1479 | if (!ctx || time_after(timeout, ctx->gc_expiry)) |
1480 | ret = -EACCES; | |
c5e6aecd | 1481 | rcu_read_unlock(); |
cc6a7aab AB |
1482 | |
1483 | return ret; | |
4de6caa2 AA |
1484 | } |
1485 | ||
1da177e4 | 1486 | static int |
8a317760 | 1487 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
1488 | { |
1489 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
c5e6aecd | 1490 | struct gss_cl_ctx *ctx; |
4de6caa2 | 1491 | int ret; |
1da177e4 | 1492 | |
cd019f75 | 1493 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 1494 | goto out; |
1da177e4 | 1495 | /* Don't match with creds that have expired. */ |
c5e6aecd JL |
1496 | rcu_read_lock(); |
1497 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
1498 | if (!ctx || time_after(jiffies, ctx->gc_expiry)) { | |
1499 | rcu_read_unlock(); | |
cd019f75 | 1500 | return 0; |
c5e6aecd JL |
1501 | } |
1502 | rcu_read_unlock(); | |
cd019f75 | 1503 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) |
1da177e4 | 1504 | return 0; |
8a317760 | 1505 | out: |
68c97153 TM |
1506 | if (acred->principal != NULL) { |
1507 | if (gss_cred->gc_principal == NULL) | |
1508 | return 0; | |
4de6caa2 | 1509 | ret = strcmp(acred->principal, gss_cred->gc_principal) == 0; |
ddf529ee N |
1510 | } else { |
1511 | if (gss_cred->gc_principal != NULL) | |
1512 | return 0; | |
04d1532b | 1513 | ret = uid_eq(rc->cr_cred->fsuid, acred->cred->fsuid); |
4de6caa2 AA |
1514 | } |
1515 | return ret; | |
1da177e4 LT |
1516 | } |
1517 | ||
1518 | /* | |
e8680a24 CL |
1519 | * Marshal credentials. |
1520 | * | |
1521 | * The expensive part is computing the verifier. We can't cache a | |
1522 | * pre-computed version of the verifier because the seqno, which | |
1523 | * is different every time, is included in the MIC. | |
1524 | */ | |
1525 | static int gss_marshal(struct rpc_task *task, struct xdr_stream *xdr) | |
1da177e4 | 1526 | { |
a17c2153 TM |
1527 | struct rpc_rqst *req = task->tk_rqstp; |
1528 | struct rpc_cred *cred = req->rq_cred; | |
1da177e4 LT |
1529 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1530 | gc_base); | |
1531 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
e8680a24 | 1532 | __be32 *p, *cred_len; |
1da177e4 LT |
1533 | u32 maj_stat = 0; |
1534 | struct xdr_netobj mic; | |
1535 | struct kvec iov; | |
1536 | struct xdr_buf verf_buf; | |
0c77668d | 1537 | int status; |
1da177e4 | 1538 | |
e8680a24 CL |
1539 | /* Credential */ |
1540 | ||
1541 | p = xdr_reserve_space(xdr, 7 * sizeof(*p) + | |
1542 | ctx->gc_wire_ctx.len); | |
1543 | if (!p) | |
0c77668d | 1544 | goto marshal_failed; |
e8680a24 | 1545 | *p++ = rpc_auth_gss; |
1da177e4 LT |
1546 | cred_len = p++; |
1547 | ||
1548 | spin_lock(&ctx->gc_seq_lock); | |
97b78ae9 | 1549 | req->rq_seqno = (ctx->gc_seq < MAXSEQ) ? ctx->gc_seq++ : MAXSEQ; |
1da177e4 | 1550 | spin_unlock(&ctx->gc_seq_lock); |
97b78ae9 | 1551 | if (req->rq_seqno == MAXSEQ) |
0c77668d CL |
1552 | goto expired; |
1553 | trace_rpcgss_seqno(task); | |
1da177e4 | 1554 | |
e8680a24 CL |
1555 | *p++ = cpu_to_be32(RPC_GSS_VERSION); |
1556 | *p++ = cpu_to_be32(ctx->gc_proc); | |
1557 | *p++ = cpu_to_be32(req->rq_seqno); | |
1558 | *p++ = cpu_to_be32(gss_cred->gc_service); | |
1da177e4 | 1559 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); |
e8680a24 CL |
1560 | *cred_len = cpu_to_be32((p - (cred_len + 1)) << 2); |
1561 | ||
1562 | /* Verifier */ | |
1da177e4 LT |
1563 | |
1564 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
1565 | * starting with the xid and ending at the end of the credential: */ | |
067fb11b | 1566 | iov.iov_base = req->rq_snd_buf.head[0].iov_base; |
1da177e4 LT |
1567 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
1568 | xdr_buf_from_iov(&iov, &verf_buf); | |
1569 | ||
e8680a24 CL |
1570 | p = xdr_reserve_space(xdr, sizeof(*p)); |
1571 | if (!p) | |
0c77668d | 1572 | goto marshal_failed; |
e8680a24 | 1573 | *p++ = rpc_auth_gss; |
1da177e4 | 1574 | mic.data = (u8 *)(p + 1); |
00fd6e14 | 1575 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
e8680a24 | 1576 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
0c77668d | 1577 | goto expired; |
e8680a24 | 1578 | else if (maj_stat != 0) |
0c77668d | 1579 | goto bad_mic; |
e8680a24 | 1580 | if (xdr_stream_encode_opaque_inline(xdr, (void **)&p, mic.len) < 0) |
0c77668d CL |
1581 | goto marshal_failed; |
1582 | status = 0; | |
1583 | out: | |
e8680a24 | 1584 | gss_put_ctx(ctx); |
0c77668d CL |
1585 | return status; |
1586 | expired: | |
97b78ae9 | 1587 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0c77668d CL |
1588 | status = -EKEYEXPIRED; |
1589 | goto out; | |
1590 | marshal_failed: | |
1591 | status = -EMSGSIZE; | |
1592 | goto out; | |
1593 | bad_mic: | |
1594 | trace_rpcgss_get_mic(task, maj_stat); | |
1595 | status = -EIO; | |
1596 | goto out; | |
1da177e4 LT |
1597 | } |
1598 | ||
cd019f75 TM |
1599 | static int gss_renew_cred(struct rpc_task *task) |
1600 | { | |
a17c2153 | 1601 | struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1602 | struct gss_cred *gss_cred = container_of(oldcred, |
1603 | struct gss_cred, | |
1604 | gc_base); | |
1605 | struct rpc_auth *auth = oldcred->cr_auth; | |
1606 | struct auth_cred acred = { | |
97f68c6b | 1607 | .cred = oldcred->cr_cred, |
68c97153 | 1608 | .principal = gss_cred->gc_principal, |
cd019f75 TM |
1609 | }; |
1610 | struct rpc_cred *new; | |
1611 | ||
1612 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
1613 | if (IS_ERR(new)) | |
1614 | return PTR_ERR(new); | |
a17c2153 | 1615 | task->tk_rqstp->rq_cred = new; |
cd019f75 TM |
1616 | put_rpccred(oldcred); |
1617 | return 0; | |
1618 | } | |
1619 | ||
126e216a TM |
1620 | static int gss_cred_is_negative_entry(struct rpc_cred *cred) |
1621 | { | |
1622 | if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { | |
1623 | unsigned long now = jiffies; | |
1624 | unsigned long begin, expire; | |
8fdee4cc | 1625 | struct gss_cred *gss_cred; |
126e216a TM |
1626 | |
1627 | gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1628 | begin = gss_cred->gc_upcall_timestamp; | |
1629 | expire = begin + gss_expired_cred_retry_delay * HZ; | |
1630 | ||
1631 | if (time_in_range_open(now, begin, expire)) | |
1632 | return 1; | |
1633 | } | |
1634 | return 0; | |
1635 | } | |
1636 | ||
1da177e4 LT |
1637 | /* |
1638 | * Refresh credentials. XXX - finish | |
1639 | */ | |
1640 | static int | |
1641 | gss_refresh(struct rpc_task *task) | |
1642 | { | |
a17c2153 | 1643 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1644 | int ret = 0; |
1645 | ||
126e216a TM |
1646 | if (gss_cred_is_negative_entry(cred)) |
1647 | return -EKEYEXPIRED; | |
1648 | ||
cd019f75 TM |
1649 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
1650 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
1651 | ret = gss_renew_cred(task); | |
1652 | if (ret < 0) | |
1653 | goto out; | |
a17c2153 | 1654 | cred = task->tk_rqstp->rq_cred; |
cd019f75 | 1655 | } |
1da177e4 | 1656 | |
cd019f75 TM |
1657 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
1658 | ret = gss_refresh_upcall(task); | |
1659 | out: | |
1660 | return ret; | |
1da177e4 LT |
1661 | } |
1662 | ||
0df7fb74 TM |
1663 | /* Dummy refresh routine: used only when destroying the context */ |
1664 | static int | |
1665 | gss_refresh_null(struct rpc_task *task) | |
1666 | { | |
c297c8b9 | 1667 | return 0; |
0df7fb74 TM |
1668 | } |
1669 | ||
a0584ee9 CL |
1670 | static int |
1671 | gss_validate(struct rpc_task *task, struct xdr_stream *xdr) | |
1da177e4 | 1672 | { |
a17c2153 | 1673 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 | 1674 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
a0584ee9 | 1675 | __be32 *p, *seq = NULL; |
1da177e4 LT |
1676 | struct kvec iov; |
1677 | struct xdr_buf verf_buf; | |
1678 | struct xdr_netobj mic; | |
a0584ee9 CL |
1679 | u32 len, maj_stat; |
1680 | int status; | |
1da177e4 | 1681 | |
a0584ee9 CL |
1682 | p = xdr_inline_decode(xdr, 2 * sizeof(*p)); |
1683 | if (!p) | |
1684 | goto validate_failed; | |
1685 | if (*p++ != rpc_auth_gss) | |
1686 | goto validate_failed; | |
1687 | len = be32_to_cpup(p); | |
1688 | if (len > RPC_MAX_AUTH_SIZE) | |
1689 | goto validate_failed; | |
1690 | p = xdr_inline_decode(xdr, len); | |
1691 | if (!p) | |
1692 | goto validate_failed; | |
1da177e4 | 1693 | |
2876a344 BF |
1694 | seq = kmalloc(4, GFP_NOFS); |
1695 | if (!seq) | |
a0584ee9 CL |
1696 | goto validate_failed; |
1697 | *seq = cpu_to_be32(task->tk_rqstp->rq_seqno); | |
2876a344 BF |
1698 | iov.iov_base = seq; |
1699 | iov.iov_len = 4; | |
1da177e4 LT |
1700 | xdr_buf_from_iov(&iov, &verf_buf); |
1701 | mic.data = (u8 *)p; | |
1702 | mic.len = len; | |
00fd6e14 | 1703 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1704 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1705 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
a0584ee9 CL |
1706 | if (maj_stat) |
1707 | goto bad_mic; | |
1708 | ||
24b2605b BF |
1709 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1710 | * calculate the length of the verifier: */ | |
1be27f36 | 1711 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
a0584ee9 CL |
1712 | status = 0; |
1713 | out: | |
1da177e4 | 1714 | gss_put_ctx(ctx); |
2876a344 | 1715 | kfree(seq); |
a0584ee9 CL |
1716 | return status; |
1717 | ||
1718 | validate_failed: | |
1719 | status = -EIO; | |
1720 | goto out; | |
1721 | bad_mic: | |
0c77668d | 1722 | trace_rpcgss_verify_mic(task, maj_stat); |
a0584ee9 CL |
1723 | status = -EACCES; |
1724 | goto out; | |
1da177e4 LT |
1725 | } |
1726 | ||
e8680a24 CL |
1727 | static int gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
1728 | struct rpc_task *task, struct xdr_stream *xdr) | |
1da177e4 | 1729 | { |
e8680a24 CL |
1730 | struct rpc_rqst *rqstp = task->tk_rqstp; |
1731 | struct xdr_buf integ_buf, *snd_buf = &rqstp->rq_snd_buf; | |
1da177e4 | 1732 | struct xdr_netobj mic; |
e8680a24 CL |
1733 | __be32 *p, *integ_len; |
1734 | u32 offset, maj_stat; | |
1da177e4 | 1735 | |
e8680a24 CL |
1736 | p = xdr_reserve_space(xdr, 2 * sizeof(*p)); |
1737 | if (!p) | |
1738 | goto wrap_failed; | |
1da177e4 | 1739 | integ_len = p++; |
e8680a24 | 1740 | *p = cpu_to_be32(rqstp->rq_seqno); |
1da177e4 | 1741 | |
e8680a24 CL |
1742 | if (rpcauth_wrap_req_encode(task, xdr)) |
1743 | goto wrap_failed; | |
1da177e4 | 1744 | |
e8680a24 | 1745 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; |
1da177e4 LT |
1746 | if (xdr_buf_subsegment(snd_buf, &integ_buf, |
1747 | offset, snd_buf->len - offset)) | |
e8680a24 CL |
1748 | goto wrap_failed; |
1749 | *integ_len = cpu_to_be32(integ_buf.len); | |
1da177e4 | 1750 | |
e8680a24 CL |
1751 | p = xdr_reserve_space(xdr, 0); |
1752 | if (!p) | |
1753 | goto wrap_failed; | |
1da177e4 | 1754 | mic.data = (u8 *)(p + 1); |
00fd6e14 | 1755 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1756 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1757 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 | 1758 | else if (maj_stat) |
0c77668d | 1759 | goto bad_mic; |
e8680a24 CL |
1760 | /* Check that the trailing MIC fit in the buffer, after the fact */ |
1761 | if (xdr_stream_encode_opaque_inline(xdr, (void **)&p, mic.len) < 0) | |
1762 | goto wrap_failed; | |
1da177e4 | 1763 | return 0; |
e8680a24 CL |
1764 | wrap_failed: |
1765 | return -EMSGSIZE; | |
0c77668d CL |
1766 | bad_mic: |
1767 | trace_rpcgss_get_mic(task, maj_stat); | |
1768 | return -EIO; | |
1da177e4 LT |
1769 | } |
1770 | ||
2d2da60c BF |
1771 | static void |
1772 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1773 | { | |
1774 | int i; | |
1775 | ||
1776 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1777 | __free_page(rqstp->rq_enc_pages[i]); | |
1778 | kfree(rqstp->rq_enc_pages); | |
8dae5398 | 1779 | rqstp->rq_release_snd_buf = NULL; |
2d2da60c BF |
1780 | } |
1781 | ||
1782 | static int | |
1783 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1784 | { | |
1785 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1786 | int first, last, i; | |
1787 | ||
8dae5398 CL |
1788 | if (rqstp->rq_release_snd_buf) |
1789 | rqstp->rq_release_snd_buf(rqstp); | |
1790 | ||
2d2da60c BF |
1791 | if (snd_buf->page_len == 0) { |
1792 | rqstp->rq_enc_pages_num = 0; | |
1793 | return 0; | |
1794 | } | |
1795 | ||
09cbfeaf KS |
1796 | first = snd_buf->page_base >> PAGE_SHIFT; |
1797 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_SHIFT; | |
2d2da60c BF |
1798 | rqstp->rq_enc_pages_num = last - first + 1 + 1; |
1799 | rqstp->rq_enc_pages | |
6da2ec56 KC |
1800 | = kmalloc_array(rqstp->rq_enc_pages_num, |
1801 | sizeof(struct page *), | |
2d2da60c BF |
1802 | GFP_NOFS); |
1803 | if (!rqstp->rq_enc_pages) | |
1804 | goto out; | |
1805 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1806 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1807 | if (rqstp->rq_enc_pages[i] == NULL) | |
1808 | goto out_free; | |
1809 | } | |
1810 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1811 | return 0; | |
1812 | out_free: | |
cdead7cf TM |
1813 | rqstp->rq_enc_pages_num = i; |
1814 | priv_release_snd_buf(rqstp); | |
2d2da60c BF |
1815 | out: |
1816 | return -EAGAIN; | |
1817 | } | |
1818 | ||
e8680a24 CL |
1819 | static int gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
1820 | struct rpc_task *task, struct xdr_stream *xdr) | |
2d2da60c | 1821 | { |
e8680a24 | 1822 | struct rpc_rqst *rqstp = task->tk_rqstp; |
2d2da60c | 1823 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
e8680a24 | 1824 | u32 pad, offset, maj_stat; |
2d2da60c | 1825 | int status; |
e8680a24 | 1826 | __be32 *p, *opaque_len; |
2d2da60c BF |
1827 | struct page **inpages; |
1828 | int first; | |
2d2da60c | 1829 | struct kvec *iov; |
2d2da60c | 1830 | |
e8680a24 CL |
1831 | status = -EIO; |
1832 | p = xdr_reserve_space(xdr, 2 * sizeof(*p)); | |
1833 | if (!p) | |
1834 | goto wrap_failed; | |
2d2da60c | 1835 | opaque_len = p++; |
e8680a24 | 1836 | *p = cpu_to_be32(rqstp->rq_seqno); |
2d2da60c | 1837 | |
e8680a24 CL |
1838 | if (rpcauth_wrap_req_encode(task, xdr)) |
1839 | goto wrap_failed; | |
2d2da60c BF |
1840 | |
1841 | status = alloc_enc_pages(rqstp); | |
e8680a24 CL |
1842 | if (unlikely(status)) |
1843 | goto wrap_failed; | |
09cbfeaf | 1844 | first = snd_buf->page_base >> PAGE_SHIFT; |
2d2da60c BF |
1845 | inpages = snd_buf->pages + first; |
1846 | snd_buf->pages = rqstp->rq_enc_pages; | |
09cbfeaf | 1847 | snd_buf->page_base -= first << PAGE_SHIFT; |
7561042f | 1848 | /* |
e8680a24 CL |
1849 | * Move the tail into its own page, in case gss_wrap needs |
1850 | * more space in the head when wrapping. | |
7561042f | 1851 | * |
e8680a24 | 1852 | * Still... Why can't gss_wrap just slide the tail down? |
7561042f | 1853 | */ |
2d2da60c | 1854 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
e8680a24 CL |
1855 | char *tmp; |
1856 | ||
2d2da60c BF |
1857 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); |
1858 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1859 | snd_buf->tail[0].iov_base = tmp; | |
1860 | } | |
e8680a24 | 1861 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; |
00fd6e14 | 1862 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
7561042f | 1863 | /* slack space should prevent this ever happening: */ |
e8680a24 CL |
1864 | if (unlikely(snd_buf->len > snd_buf->buflen)) |
1865 | goto wrap_failed; | |
2d2da60c BF |
1866 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1867 | * done anyway, so it's safe to put the request on the wire: */ | |
1868 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1869 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c | 1870 | else if (maj_stat) |
0c77668d | 1871 | goto bad_wrap; |
2d2da60c | 1872 | |
e8680a24 CL |
1873 | *opaque_len = cpu_to_be32(snd_buf->len - offset); |
1874 | /* guess whether the pad goes into the head or the tail: */ | |
2d2da60c BF |
1875 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1876 | iov = snd_buf->tail; | |
1877 | else | |
1878 | iov = snd_buf->head; | |
1879 | p = iov->iov_base + iov->iov_len; | |
1880 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1881 | memset(p, 0, pad); | |
1882 | iov->iov_len += pad; | |
1883 | snd_buf->len += pad; | |
1884 | ||
1885 | return 0; | |
e8680a24 CL |
1886 | wrap_failed: |
1887 | return status; | |
0c77668d CL |
1888 | bad_wrap: |
1889 | trace_rpcgss_wrap(task, maj_stat); | |
1890 | return -EIO; | |
2d2da60c BF |
1891 | } |
1892 | ||
e8680a24 | 1893 | static int gss_wrap_req(struct rpc_task *task, struct xdr_stream *xdr) |
1da177e4 | 1894 | { |
a17c2153 | 1895 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1896 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1897 | gc_base); | |
1898 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
e8680a24 | 1899 | int status; |
1da177e4 | 1900 | |
e8680a24 | 1901 | status = -EIO; |
1da177e4 LT |
1902 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1903 | /* The spec seems a little ambiguous here, but I think that not | |
1904 | * wrapping context destruction requests makes the most sense. | |
1905 | */ | |
e8680a24 | 1906 | status = rpcauth_wrap_req_encode(task, xdr); |
1da177e4 LT |
1907 | goto out; |
1908 | } | |
1909 | switch (gss_cred->gc_service) { | |
89f0e4fe | 1910 | case RPC_GSS_SVC_NONE: |
e8680a24 | 1911 | status = rpcauth_wrap_req_encode(task, xdr); |
89f0e4fe JP |
1912 | break; |
1913 | case RPC_GSS_SVC_INTEGRITY: | |
e8680a24 | 1914 | status = gss_wrap_req_integ(cred, ctx, task, xdr); |
89f0e4fe JP |
1915 | break; |
1916 | case RPC_GSS_SVC_PRIVACY: | |
e8680a24 | 1917 | status = gss_wrap_req_priv(cred, ctx, task, xdr); |
89f0e4fe | 1918 | break; |
0c77668d CL |
1919 | default: |
1920 | status = -EIO; | |
1da177e4 LT |
1921 | } |
1922 | out: | |
1923 | gss_put_ctx(ctx); | |
1da177e4 LT |
1924 | return status; |
1925 | } | |
1926 | ||
a0584ee9 CL |
1927 | static int |
1928 | gss_unwrap_resp_auth(struct rpc_cred *cred) | |
1929 | { | |
35e77d21 CL |
1930 | struct rpc_auth *auth = cred->cr_auth; |
1931 | ||
1932 | auth->au_rslack = auth->au_verfsize; | |
1933 | auth->au_ralign = auth->au_verfsize; | |
a0584ee9 CL |
1934 | return 0; |
1935 | } | |
1936 | ||
1937 | static int | |
0c77668d CL |
1938 | gss_unwrap_resp_integ(struct rpc_task *task, struct rpc_cred *cred, |
1939 | struct gss_cl_ctx *ctx, struct rpc_rqst *rqstp, | |
1940 | struct xdr_stream *xdr) | |
1da177e4 | 1941 | { |
a0584ee9 CL |
1942 | struct xdr_buf integ_buf, *rcv_buf = &rqstp->rq_rcv_buf; |
1943 | u32 data_offset, mic_offset, integ_len, maj_stat; | |
35e77d21 | 1944 | struct rpc_auth *auth = cred->cr_auth; |
1da177e4 | 1945 | struct xdr_netobj mic; |
a0584ee9 | 1946 | __be32 *p; |
1da177e4 | 1947 | |
a0584ee9 CL |
1948 | p = xdr_inline_decode(xdr, 2 * sizeof(*p)); |
1949 | if (unlikely(!p)) | |
1950 | goto unwrap_failed; | |
1951 | integ_len = be32_to_cpup(p++); | |
1da177e4 | 1952 | if (integ_len & 3) |
a0584ee9 CL |
1953 | goto unwrap_failed; |
1954 | data_offset = (u8 *)(p) - (u8 *)rcv_buf->head[0].iov_base; | |
1da177e4 LT |
1955 | mic_offset = integ_len + data_offset; |
1956 | if (mic_offset > rcv_buf->len) | |
a0584ee9 CL |
1957 | goto unwrap_failed; |
1958 | if (be32_to_cpup(p) != rqstp->rq_seqno) | |
0c77668d | 1959 | goto bad_seqno; |
1da177e4 | 1960 | |
a0584ee9 CL |
1961 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, integ_len)) |
1962 | goto unwrap_failed; | |
1da177e4 | 1963 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) |
a0584ee9 | 1964 | goto unwrap_failed; |
00fd6e14 | 1965 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1966 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1967 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 | 1968 | if (maj_stat != GSS_S_COMPLETE) |
a0584ee9 CL |
1969 | goto bad_mic; |
1970 | ||
35e77d21 CL |
1971 | auth->au_rslack = auth->au_verfsize + 2 + 1 + XDR_QUADLEN(mic.len); |
1972 | auth->au_ralign = auth->au_verfsize + 2; | |
1da177e4 | 1973 | return 0; |
a0584ee9 | 1974 | unwrap_failed: |
0c77668d CL |
1975 | trace_rpcgss_unwrap_failed(task); |
1976 | return -EIO; | |
1977 | bad_seqno: | |
1978 | trace_rpcgss_bad_seqno(task, rqstp->rq_seqno, be32_to_cpup(p)); | |
a0584ee9 CL |
1979 | return -EIO; |
1980 | bad_mic: | |
0c77668d | 1981 | trace_rpcgss_verify_mic(task, maj_stat); |
a0584ee9 | 1982 | return -EIO; |
1da177e4 LT |
1983 | } |
1984 | ||
a0584ee9 | 1985 | static int |
0c77668d CL |
1986 | gss_unwrap_resp_priv(struct rpc_task *task, struct rpc_cred *cred, |
1987 | struct gss_cl_ctx *ctx, struct rpc_rqst *rqstp, | |
1988 | struct xdr_stream *xdr) | |
a0584ee9 CL |
1989 | { |
1990 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1991 | struct kvec *head = rqstp->rq_rcv_buf.head; | |
35e77d21 | 1992 | struct rpc_auth *auth = cred->cr_auth; |
a0584ee9 CL |
1993 | unsigned int savedlen = rcv_buf->len; |
1994 | u32 offset, opaque_len, maj_stat; | |
1995 | __be32 *p; | |
1996 | ||
1997 | p = xdr_inline_decode(xdr, 2 * sizeof(*p)); | |
1998 | if (unlikely(!p)) | |
1999 | goto unwrap_failed; | |
2000 | opaque_len = be32_to_cpup(p++); | |
2001 | offset = (u8 *)(p) - (u8 *)head->iov_base; | |
2d2da60c | 2002 | if (offset + opaque_len > rcv_buf->len) |
a0584ee9 | 2003 | goto unwrap_failed; |
2d2da60c BF |
2004 | rcv_buf->len = offset + opaque_len; |
2005 | ||
00fd6e14 | 2006 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 2007 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 2008 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c | 2009 | if (maj_stat != GSS_S_COMPLETE) |
a0584ee9 CL |
2010 | goto bad_unwrap; |
2011 | /* gss_unwrap decrypted the sequence number */ | |
2012 | if (be32_to_cpup(p++) != rqstp->rq_seqno) | |
0c77668d | 2013 | goto bad_seqno; |
2d2da60c | 2014 | |
a0584ee9 CL |
2015 | /* gss_unwrap redacts the opaque blob from the head iovec. |
2016 | * rcv_buf has changed, thus the stream needs to be reset. | |
2017 | */ | |
2018 | xdr_init_decode(xdr, rcv_buf, p, rqstp); | |
bf269551 | 2019 | |
35e77d21 CL |
2020 | auth->au_rslack = auth->au_verfsize + 2 + |
2021 | XDR_QUADLEN(savedlen - rcv_buf->len); | |
2022 | auth->au_ralign = auth->au_verfsize + 2 + | |
2023 | XDR_QUADLEN(savedlen - rcv_buf->len); | |
a0584ee9 CL |
2024 | return 0; |
2025 | unwrap_failed: | |
0c77668d CL |
2026 | trace_rpcgss_unwrap_failed(task); |
2027 | return -EIO; | |
2028 | bad_seqno: | |
2029 | trace_rpcgss_bad_seqno(task, rqstp->rq_seqno, be32_to_cpup(--p)); | |
a0584ee9 CL |
2030 | return -EIO; |
2031 | bad_unwrap: | |
0c77668d | 2032 | trace_rpcgss_unwrap(task, maj_stat); |
a0584ee9 | 2033 | return -EIO; |
bf269551 | 2034 | } |
2d2da60c | 2035 | |
3021a5bb TM |
2036 | static bool |
2037 | gss_seq_is_newer(u32 new, u32 old) | |
2038 | { | |
2039 | return (s32)(new - old) > 0; | |
2040 | } | |
2041 | ||
2042 | static bool | |
2043 | gss_xmit_need_reencode(struct rpc_task *task) | |
2044 | { | |
2045 | struct rpc_rqst *req = task->tk_rqstp; | |
2046 | struct rpc_cred *cred = req->rq_cred; | |
2047 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
0c77668d | 2048 | u32 win, seq_xmit = 0; |
3021a5bb TM |
2049 | bool ret = true; |
2050 | ||
2051 | if (!ctx) | |
0c77668d | 2052 | goto out; |
3021a5bb TM |
2053 | |
2054 | if (gss_seq_is_newer(req->rq_seqno, READ_ONCE(ctx->gc_seq))) | |
0c77668d | 2055 | goto out_ctx; |
3021a5bb TM |
2056 | |
2057 | seq_xmit = READ_ONCE(ctx->gc_seq_xmit); | |
2058 | while (gss_seq_is_newer(req->rq_seqno, seq_xmit)) { | |
2059 | u32 tmp = seq_xmit; | |
2060 | ||
2061 | seq_xmit = cmpxchg(&ctx->gc_seq_xmit, tmp, req->rq_seqno); | |
2062 | if (seq_xmit == tmp) { | |
2063 | ret = false; | |
0c77668d | 2064 | goto out_ctx; |
3021a5bb TM |
2065 | } |
2066 | } | |
2067 | ||
2068 | win = ctx->gc_win; | |
2069 | if (win > 0) | |
2070 | ret = !gss_seq_is_newer(req->rq_seqno, seq_xmit - win); | |
0c77668d CL |
2071 | |
2072 | out_ctx: | |
3021a5bb | 2073 | gss_put_ctx(ctx); |
0c77668d CL |
2074 | out: |
2075 | trace_rpcgss_need_reencode(task, seq_xmit, ret); | |
3021a5bb TM |
2076 | return ret; |
2077 | } | |
2078 | ||
1da177e4 | 2079 | static int |
a0584ee9 | 2080 | gss_unwrap_resp(struct rpc_task *task, struct xdr_stream *xdr) |
1da177e4 | 2081 | { |
a0584ee9 CL |
2082 | struct rpc_rqst *rqstp = task->tk_rqstp; |
2083 | struct rpc_cred *cred = rqstp->rq_cred; | |
1da177e4 LT |
2084 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
2085 | gc_base); | |
2086 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
a0584ee9 | 2087 | int status = -EIO; |
1da177e4 LT |
2088 | |
2089 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
2090 | goto out_decode; | |
2091 | switch (gss_cred->gc_service) { | |
89f0e4fe | 2092 | case RPC_GSS_SVC_NONE: |
a0584ee9 | 2093 | status = gss_unwrap_resp_auth(cred); |
89f0e4fe JP |
2094 | break; |
2095 | case RPC_GSS_SVC_INTEGRITY: | |
0c77668d | 2096 | status = gss_unwrap_resp_integ(task, cred, ctx, rqstp, xdr); |
89f0e4fe JP |
2097 | break; |
2098 | case RPC_GSS_SVC_PRIVACY: | |
0c77668d | 2099 | status = gss_unwrap_resp_priv(task, cred, ctx, rqstp, xdr); |
89f0e4fe | 2100 | break; |
1da177e4 | 2101 | } |
a0584ee9 CL |
2102 | if (status) |
2103 | goto out; | |
2104 | ||
1da177e4 | 2105 | out_decode: |
a0584ee9 | 2106 | status = rpcauth_unwrap_resp_decode(task, xdr); |
1da177e4 LT |
2107 | out: |
2108 | gss_put_ctx(ctx); | |
1da177e4 LT |
2109 | return status; |
2110 | } | |
cca5172a | 2111 | |
f1c0a861 | 2112 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
2113 | .owner = THIS_MODULE, |
2114 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 2115 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
2116 | .create = gss_create, |
2117 | .destroy = gss_destroy, | |
a960f8d6 | 2118 | .hash_cred = gss_hash_cred, |
1da177e4 | 2119 | .lookup_cred = gss_lookup_cred, |
80df9d20 | 2120 | .crcreate = gss_create_cred, |
6a1a1e34 | 2121 | .list_pseudoflavors = gss_mech_list_pseudoflavors, |
9568c5e9 | 2122 | .info2flavor = gss_mech_info2flavor, |
a77c806f | 2123 | .flavor2info = gss_mech_flavor2info, |
1da177e4 LT |
2124 | }; |
2125 | ||
f1c0a861 | 2126 | static const struct rpc_credops gss_credops = { |
a0337d1d JL |
2127 | .cr_name = "AUTH_GSS", |
2128 | .crdestroy = gss_destroy_cred, | |
2129 | .cr_init = gss_cred_init, | |
a0337d1d JL |
2130 | .crmatch = gss_match, |
2131 | .crmarshal = gss_marshal, | |
2132 | .crrefresh = gss_refresh, | |
2133 | .crvalidate = gss_validate, | |
2134 | .crwrap_req = gss_wrap_req, | |
2135 | .crunwrap_resp = gss_unwrap_resp, | |
2136 | .crkey_timeout = gss_key_timeout, | |
2137 | .crstringify_acceptor = gss_stringify_acceptor, | |
3021a5bb | 2138 | .crneed_reencode = gss_xmit_need_reencode, |
1da177e4 LT |
2139 | }; |
2140 | ||
0df7fb74 | 2141 | static const struct rpc_credops gss_nullops = { |
a0337d1d JL |
2142 | .cr_name = "AUTH_GSS", |
2143 | .crdestroy = gss_destroy_nullcred, | |
a0337d1d JL |
2144 | .crmatch = gss_match, |
2145 | .crmarshal = gss_marshal, | |
2146 | .crrefresh = gss_refresh_null, | |
2147 | .crvalidate = gss_validate, | |
2148 | .crwrap_req = gss_wrap_req, | |
2149 | .crunwrap_resp = gss_unwrap_resp, | |
2150 | .crstringify_acceptor = gss_stringify_acceptor, | |
0df7fb74 TM |
2151 | }; |
2152 | ||
b693ba4a | 2153 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
ac83228a | 2154 | .upcall = gss_v0_upcall, |
34769fc4 BF |
2155 | .downcall = gss_pipe_downcall, |
2156 | .destroy_msg = gss_pipe_destroy_msg, | |
2157 | .open_pipe = gss_pipe_open_v0, | |
2158 | .release_pipe = gss_pipe_release, | |
2159 | }; | |
2160 | ||
b693ba4a | 2161 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
ac83228a | 2162 | .upcall = gss_v1_upcall, |
1da177e4 LT |
2163 | .downcall = gss_pipe_downcall, |
2164 | .destroy_msg = gss_pipe_destroy_msg, | |
34769fc4 | 2165 | .open_pipe = gss_pipe_open_v1, |
1da177e4 LT |
2166 | .release_pipe = gss_pipe_release, |
2167 | }; | |
2168 | ||
a1db410d SK |
2169 | static __net_init int rpcsec_gss_init_net(struct net *net) |
2170 | { | |
2171 | return gss_svc_init_net(net); | |
2172 | } | |
2173 | ||
2174 | static __net_exit void rpcsec_gss_exit_net(struct net *net) | |
2175 | { | |
2176 | gss_svc_shutdown_net(net); | |
2177 | } | |
2178 | ||
2179 | static struct pernet_operations rpcsec_gss_net_ops = { | |
2180 | .init = rpcsec_gss_init_net, | |
2181 | .exit = rpcsec_gss_exit_net, | |
2182 | }; | |
2183 | ||
1da177e4 LT |
2184 | /* |
2185 | * Initialize RPCSEC_GSS module | |
2186 | */ | |
2187 | static int __init init_rpcsec_gss(void) | |
2188 | { | |
2189 | int err = 0; | |
2190 | ||
2191 | err = rpcauth_register(&authgss_ops); | |
2192 | if (err) | |
2193 | goto out; | |
2194 | err = gss_svc_init(); | |
2195 | if (err) | |
2196 | goto out_unregister; | |
a1db410d SK |
2197 | err = register_pernet_subsys(&rpcsec_gss_net_ops); |
2198 | if (err) | |
2199 | goto out_svc_exit; | |
79a3f20b | 2200 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
1da177e4 | 2201 | return 0; |
a1db410d SK |
2202 | out_svc_exit: |
2203 | gss_svc_shutdown(); | |
1da177e4 LT |
2204 | out_unregister: |
2205 | rpcauth_unregister(&authgss_ops); | |
2206 | out: | |
2207 | return err; | |
2208 | } | |
2209 | ||
2210 | static void __exit exit_rpcsec_gss(void) | |
2211 | { | |
a1db410d | 2212 | unregister_pernet_subsys(&rpcsec_gss_net_ops); |
1da177e4 LT |
2213 | gss_svc_shutdown(); |
2214 | rpcauth_unregister(&authgss_ops); | |
bf12691d | 2215 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
2216 | } |
2217 | ||
71afa85e | 2218 | MODULE_ALIAS("rpc-auth-6"); |
1da177e4 | 2219 | MODULE_LICENSE("GPL"); |
126e216a TM |
2220 | module_param_named(expired_cred_retry_delay, |
2221 | gss_expired_cred_retry_delay, | |
2222 | uint, 0644); | |
2223 | MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " | |
2224 | "the RPC engine retries an expired credential"); | |
2225 | ||
4de6caa2 AA |
2226 | module_param_named(key_expire_timeo, |
2227 | gss_key_expire_timeo, | |
2228 | uint, 0644); | |
2229 | MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a " | |
2230 | "credential keys lifetime where the NFS layer cleans up " | |
2231 | "prior to key expiration"); | |
2232 | ||
1da177e4 LT |
2233 | module_init(init_rpcsec_gss) |
2234 | module_exit(exit_rpcsec_gss) |