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TOMOYO Linux Cross Reference
Linux/crypto/algif_hash.c

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  1 /*
  2  * algif_hash: User-space interface for hash algorithms
  3  *
  4  * This file provides the user-space API for hash algorithms.
  5  *
  6  * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
  7  *
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms of the GNU General Public License as published by the Free
 10  * Software Foundation; either version 2 of the License, or (at your option)
 11  * any later version.
 12  *
 13  */
 14 
 15 #include <crypto/hash.h>
 16 #include <crypto/if_alg.h>
 17 #include <linux/init.h>
 18 #include <linux/kernel.h>
 19 #include <linux/mm.h>
 20 #include <linux/module.h>
 21 #include <linux/net.h>
 22 #include <net/sock.h>
 23 
 24 struct hash_ctx {
 25         struct af_alg_sgl sgl;
 26 
 27         u8 *result;
 28 
 29         struct af_alg_completion completion;
 30 
 31         unsigned int len;
 32         bool more;
 33 
 34         struct ahash_request req;
 35 };
 36 
 37 struct algif_hash_tfm {
 38         struct crypto_ahash *hash;
 39         bool has_key;
 40 };
 41 
 42 static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
 43                         size_t ignored)
 44 {
 45         int limit = ALG_MAX_PAGES * PAGE_SIZE;
 46         struct sock *sk = sock->sk;
 47         struct alg_sock *ask = alg_sk(sk);
 48         struct hash_ctx *ctx = ask->private;
 49         long copied = 0;
 50         int err;
 51 
 52         if (limit > sk->sk_sndbuf)
 53                 limit = sk->sk_sndbuf;
 54 
 55         lock_sock(sk);
 56         if (!ctx->more) {
 57                 err = af_alg_wait_for_completion(crypto_ahash_init(&ctx->req),
 58                                                 &ctx->completion);
 59                 if (err)
 60                         goto unlock;
 61         }
 62 
 63         ctx->more = 0;
 64 
 65         while (msg_data_left(msg)) {
 66                 int len = msg_data_left(msg);
 67 
 68                 if (len > limit)
 69                         len = limit;
 70 
 71                 len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
 72                 if (len < 0) {
 73                         err = copied ? 0 : len;
 74                         goto unlock;
 75                 }
 76 
 77                 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
 78 
 79                 err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
 80                                                  &ctx->completion);
 81                 af_alg_free_sg(&ctx->sgl);
 82                 if (err)
 83                         goto unlock;
 84 
 85                 copied += len;
 86                 iov_iter_advance(&msg->msg_iter, len);
 87         }
 88 
 89         err = 0;
 90 
 91         ctx->more = msg->msg_flags & MSG_MORE;
 92         if (!ctx->more) {
 93                 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
 94                 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
 95                                                  &ctx->completion);
 96         }
 97 
 98 unlock:
 99         release_sock(sk);
100 
101         return err ?: copied;
102 }
103 
104 static ssize_t hash_sendpage(struct socket *sock, struct page *page,
105                              int offset, size_t size, int flags)
106 {
107         struct sock *sk = sock->sk;
108         struct alg_sock *ask = alg_sk(sk);
109         struct hash_ctx *ctx = ask->private;
110         int err;
111 
112         if (flags & MSG_SENDPAGE_NOTLAST)
113                 flags |= MSG_MORE;
114 
115         lock_sock(sk);
116         sg_init_table(ctx->sgl.sg, 1);
117         sg_set_page(ctx->sgl.sg, page, size, offset);
118 
119         ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
120 
121         if (!(flags & MSG_MORE)) {
122                 if (ctx->more)
123                         err = crypto_ahash_finup(&ctx->req);
124                 else
125                         err = crypto_ahash_digest(&ctx->req);
126         } else {
127                 if (!ctx->more) {
128                         err = crypto_ahash_init(&ctx->req);
129                         err = af_alg_wait_for_completion(err, &ctx->completion);
130                         if (err)
131                                 goto unlock;
132                 }
133 
134                 err = crypto_ahash_update(&ctx->req);
135         }
136 
137         err = af_alg_wait_for_completion(err, &ctx->completion);
138         if (err)
139                 goto unlock;
140 
141         ctx->more = flags & MSG_MORE;
142 
143 unlock:
144         release_sock(sk);
145 
146         return err ?: size;
147 }
148 
149 static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
150                         int flags)
151 {
152         struct sock *sk = sock->sk;
153         struct alg_sock *ask = alg_sk(sk);
154         struct hash_ctx *ctx = ask->private;
155         unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
156         int err;
157 
158         if (len > ds)
159                 len = ds;
160         else if (len < ds)
161                 msg->msg_flags |= MSG_TRUNC;
162 
163         lock_sock(sk);
164         if (ctx->more) {
165                 ctx->more = 0;
166                 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
167                 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
168                                                  &ctx->completion);
169                 if (err)
170                         goto unlock;
171         }
172 
173         err = memcpy_to_msg(msg, ctx->result, len);
174 
175 unlock:
176         release_sock(sk);
177 
178         return err ?: len;
179 }
180 
181 static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
182 {
183         struct sock *sk = sock->sk;
184         struct alg_sock *ask = alg_sk(sk);
185         struct hash_ctx *ctx = ask->private;
186         struct ahash_request *req = &ctx->req;
187         char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
188         struct sock *sk2;
189         struct alg_sock *ask2;
190         struct hash_ctx *ctx2;
191         bool more;
192         int err;
193 
194         lock_sock(sk);
195         more = ctx->more;
196         err = more ? crypto_ahash_export(req, state) : 0;
197         release_sock(sk);
198 
199         if (err)
200                 return err;
201 
202         err = af_alg_accept(ask->parent, newsock);
203         if (err)
204                 return err;
205 
206         sk2 = newsock->sk;
207         ask2 = alg_sk(sk2);
208         ctx2 = ask2->private;
209         ctx2->more = more;
210 
211         if (!more)
212                 return err;
213 
214         err = crypto_ahash_import(&ctx2->req, state);
215         if (err) {
216                 sock_orphan(sk2);
217                 sock_put(sk2);
218         }
219 
220         return err;
221 }
222 
223 static struct proto_ops algif_hash_ops = {
224         .family         =       PF_ALG,
225 
226         .connect        =       sock_no_connect,
227         .socketpair     =       sock_no_socketpair,
228         .getname        =       sock_no_getname,
229         .ioctl          =       sock_no_ioctl,
230         .listen         =       sock_no_listen,
231         .shutdown       =       sock_no_shutdown,
232         .getsockopt     =       sock_no_getsockopt,
233         .mmap           =       sock_no_mmap,
234         .bind           =       sock_no_bind,
235         .setsockopt     =       sock_no_setsockopt,
236         .poll           =       sock_no_poll,
237 
238         .release        =       af_alg_release,
239         .sendmsg        =       hash_sendmsg,
240         .sendpage       =       hash_sendpage,
241         .recvmsg        =       hash_recvmsg,
242         .accept         =       hash_accept,
243 };
244 
245 static int hash_check_key(struct socket *sock)
246 {
247         int err = 0;
248         struct sock *psk;
249         struct alg_sock *pask;
250         struct algif_hash_tfm *tfm;
251         struct sock *sk = sock->sk;
252         struct alg_sock *ask = alg_sk(sk);
253 
254         lock_sock(sk);
255         if (ask->refcnt)
256                 goto unlock_child;
257 
258         psk = ask->parent;
259         pask = alg_sk(ask->parent);
260         tfm = pask->private;
261 
262         err = -ENOKEY;
263         lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
264         if (!tfm->has_key)
265                 goto unlock;
266 
267         if (!pask->refcnt++)
268                 sock_hold(psk);
269 
270         ask->refcnt = 1;
271         sock_put(psk);
272 
273         err = 0;
274 
275 unlock:
276         release_sock(psk);
277 unlock_child:
278         release_sock(sk);
279 
280         return err;
281 }
282 
283 static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
284                               size_t size)
285 {
286         int err;
287 
288         err = hash_check_key(sock);
289         if (err)
290                 return err;
291 
292         return hash_sendmsg(sock, msg, size);
293 }
294 
295 static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
296                                    int offset, size_t size, int flags)
297 {
298         int err;
299 
300         err = hash_check_key(sock);
301         if (err)
302                 return err;
303 
304         return hash_sendpage(sock, page, offset, size, flags);
305 }
306 
307 static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
308                               size_t ignored, int flags)
309 {
310         int err;
311 
312         err = hash_check_key(sock);
313         if (err)
314                 return err;
315 
316         return hash_recvmsg(sock, msg, ignored, flags);
317 }
318 
319 static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
320                              int flags)
321 {
322         int err;
323 
324         err = hash_check_key(sock);
325         if (err)
326                 return err;
327 
328         return hash_accept(sock, newsock, flags);
329 }
330 
331 static struct proto_ops algif_hash_ops_nokey = {
332         .family         =       PF_ALG,
333 
334         .connect        =       sock_no_connect,
335         .socketpair     =       sock_no_socketpair,
336         .getname        =       sock_no_getname,
337         .ioctl          =       sock_no_ioctl,
338         .listen         =       sock_no_listen,
339         .shutdown       =       sock_no_shutdown,
340         .getsockopt     =       sock_no_getsockopt,
341         .mmap           =       sock_no_mmap,
342         .bind           =       sock_no_bind,
343         .setsockopt     =       sock_no_setsockopt,
344         .poll           =       sock_no_poll,
345 
346         .release        =       af_alg_release,
347         .sendmsg        =       hash_sendmsg_nokey,
348         .sendpage       =       hash_sendpage_nokey,
349         .recvmsg        =       hash_recvmsg_nokey,
350         .accept         =       hash_accept_nokey,
351 };
352 
353 static void *hash_bind(const char *name, u32 type, u32 mask)
354 {
355         struct algif_hash_tfm *tfm;
356         struct crypto_ahash *hash;
357 
358         tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
359         if (!tfm)
360                 return ERR_PTR(-ENOMEM);
361 
362         hash = crypto_alloc_ahash(name, type, mask);
363         if (IS_ERR(hash)) {
364                 kfree(tfm);
365                 return ERR_CAST(hash);
366         }
367 
368         tfm->hash = hash;
369 
370         return tfm;
371 }
372 
373 static void hash_release(void *private)
374 {
375         struct algif_hash_tfm *tfm = private;
376 
377         crypto_free_ahash(tfm->hash);
378         kfree(tfm);
379 }
380 
381 static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
382 {
383         struct algif_hash_tfm *tfm = private;
384         int err;
385 
386         err = crypto_ahash_setkey(tfm->hash, key, keylen);
387         tfm->has_key = !err;
388 
389         return err;
390 }
391 
392 static void hash_sock_destruct(struct sock *sk)
393 {
394         struct alg_sock *ask = alg_sk(sk);
395         struct hash_ctx *ctx = ask->private;
396 
397         sock_kzfree_s(sk, ctx->result,
398                       crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
399         sock_kfree_s(sk, ctx, ctx->len);
400         af_alg_release_parent(sk);
401 }
402 
403 static int hash_accept_parent_nokey(void *private, struct sock *sk)
404 {
405         struct hash_ctx *ctx;
406         struct alg_sock *ask = alg_sk(sk);
407         struct algif_hash_tfm *tfm = private;
408         struct crypto_ahash *hash = tfm->hash;
409         unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
410         unsigned ds = crypto_ahash_digestsize(hash);
411 
412         ctx = sock_kmalloc(sk, len, GFP_KERNEL);
413         if (!ctx)
414                 return -ENOMEM;
415 
416         ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
417         if (!ctx->result) {
418                 sock_kfree_s(sk, ctx, len);
419                 return -ENOMEM;
420         }
421 
422         memset(ctx->result, 0, ds);
423 
424         ctx->len = len;
425         ctx->more = 0;
426         af_alg_init_completion(&ctx->completion);
427 
428         ask->private = ctx;
429 
430         ahash_request_set_tfm(&ctx->req, hash);
431         ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
432                                    af_alg_complete, &ctx->completion);
433 
434         sk->sk_destruct = hash_sock_destruct;
435 
436         return 0;
437 }
438 
439 static int hash_accept_parent(void *private, struct sock *sk)
440 {
441         struct algif_hash_tfm *tfm = private;
442 
443         if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
444                 return -ENOKEY;
445 
446         return hash_accept_parent_nokey(private, sk);
447 }
448 
449 static const struct af_alg_type algif_type_hash = {
450         .bind           =       hash_bind,
451         .release        =       hash_release,
452         .setkey         =       hash_setkey,
453         .accept         =       hash_accept_parent,
454         .accept_nokey   =       hash_accept_parent_nokey,
455         .ops            =       &algif_hash_ops,
456         .ops_nokey      =       &algif_hash_ops_nokey,
457         .name           =       "hash",
458         .owner          =       THIS_MODULE
459 };
460 
461 static int __init algif_hash_init(void)
462 {
463         return af_alg_register_type(&algif_type_hash);
464 }
465 
466 static void __exit algif_hash_exit(void)
467 {
468         int err = af_alg_unregister_type(&algif_type_hash);
469         BUG_ON(err);
470 }
471 
472 module_init(algif_hash_init);
473 module_exit(algif_hash_exit);
474 MODULE_LICENSE("GPL");
475 

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