blob: 6c9b1927a52084a909093b40ef47fe92b2703db0 [file] [log] [blame]
Herbert Xufe869cd2010-10-19 21:23:00 +08001/*
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
24struct hash_ctx {
25 struct af_alg_sgl sgl;
26
27 u8 *result;
28
Gilad Ben-Yossef2c3f8b12017-10-18 08:00:39 +010029 struct crypto_wait wait;
Herbert Xufe869cd2010-10-19 21:23:00 +080030
31 unsigned int len;
32 bool more;
33
34 struct ahash_request req;
35};
36
Herbert Xu493b2ed2016-09-01 17:16:44 +080037static int hash_alloc_result(struct sock *sk, struct hash_ctx *ctx)
38{
39 unsigned ds;
40
41 if (ctx->result)
42 return 0;
43
44 ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
45
46 ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
47 if (!ctx->result)
48 return -ENOMEM;
49
50 memset(ctx->result, 0, ds);
51
52 return 0;
53}
54
55static void hash_free_result(struct sock *sk, struct hash_ctx *ctx)
56{
57 unsigned ds;
58
59 if (!ctx->result)
60 return;
61
62 ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
63
64 sock_kzfree_s(sk, ctx->result, ds);
65 ctx->result = NULL;
66}
67
Ying Xue1b784142015-03-02 15:37:48 +080068static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
69 size_t ignored)
Herbert Xufe869cd2010-10-19 21:23:00 +080070{
71 int limit = ALG_MAX_PAGES * PAGE_SIZE;
72 struct sock *sk = sock->sk;
73 struct alg_sock *ask = alg_sk(sk);
74 struct hash_ctx *ctx = ask->private;
Herbert Xufe869cd2010-10-19 21:23:00 +080075 long copied = 0;
76 int err;
77
78 if (limit > sk->sk_sndbuf)
79 limit = sk->sk_sndbuf;
80
81 lock_sock(sk);
82 if (!ctx->more) {
Herbert Xu493b2ed2016-09-01 17:16:44 +080083 if ((msg->msg_flags & MSG_MORE))
84 hash_free_result(sk, ctx);
85
Gilad Ben-Yossef2c3f8b12017-10-18 08:00:39 +010086 err = crypto_wait_req(crypto_ahash_init(&ctx->req), &ctx->wait);
Herbert Xufe869cd2010-10-19 21:23:00 +080087 if (err)
88 goto unlock;
89 }
90
91 ctx->more = 0;
92
Al Viro01e97e62014-12-15 21:39:31 -050093 while (msg_data_left(msg)) {
94 int len = msg_data_left(msg);
Herbert Xufe869cd2010-10-19 21:23:00 +080095
Al Viro1d10eb22014-11-28 16:39:25 -050096 if (len > limit)
97 len = limit;
Herbert Xufe869cd2010-10-19 21:23:00 +080098
Al Viro1d10eb22014-11-28 16:39:25 -050099 len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
100 if (len < 0) {
101 err = copied ? 0 : len;
102 goto unlock;
Herbert Xufe869cd2010-10-19 21:23:00 +0800103 }
Al Viro1d10eb22014-11-28 16:39:25 -0500104
105 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
106
Gilad Ben-Yossef2c3f8b12017-10-18 08:00:39 +0100107 err = crypto_wait_req(crypto_ahash_update(&ctx->req),
108 &ctx->wait);
Al Viro1d10eb22014-11-28 16:39:25 -0500109 af_alg_free_sg(&ctx->sgl);
110 if (err)
111 goto unlock;
112
113 copied += len;
114 iov_iter_advance(&msg->msg_iter, len);
Herbert Xufe869cd2010-10-19 21:23:00 +0800115 }
116
117 err = 0;
118
119 ctx->more = msg->msg_flags & MSG_MORE;
120 if (!ctx->more) {
Herbert Xu493b2ed2016-09-01 17:16:44 +0800121 err = hash_alloc_result(sk, ctx);
122 if (err)
123 goto unlock;
124
Herbert Xufe869cd2010-10-19 21:23:00 +0800125 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
Gilad Ben-Yossef2c3f8b12017-10-18 08:00:39 +0100126 err = crypto_wait_req(crypto_ahash_final(&ctx->req),
127 &ctx->wait);
Herbert Xufe869cd2010-10-19 21:23:00 +0800128 }
129
130unlock:
131 release_sock(sk);
132
133 return err ?: copied;
134}
135
136static ssize_t hash_sendpage(struct socket *sock, struct page *page,
137 int offset, size_t size, int flags)
138{
139 struct sock *sk = sock->sk;
140 struct alg_sock *ask = alg_sk(sk);
141 struct hash_ctx *ctx = ask->private;
142 int err;
143
Shawn Landdend3f7d562013-11-24 22:36:28 -0800144 if (flags & MSG_SENDPAGE_NOTLAST)
145 flags |= MSG_MORE;
146
Herbert Xufe869cd2010-10-19 21:23:00 +0800147 lock_sock(sk);
148 sg_init_table(ctx->sgl.sg, 1);
149 sg_set_page(ctx->sgl.sg, page, size, offset);
150
Herbert Xu493b2ed2016-09-01 17:16:44 +0800151 if (!(flags & MSG_MORE)) {
152 err = hash_alloc_result(sk, ctx);
153 if (err)
154 goto unlock;
155 } else if (!ctx->more)
156 hash_free_result(sk, ctx);
157
Herbert Xufe869cd2010-10-19 21:23:00 +0800158 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
159
160 if (!(flags & MSG_MORE)) {
161 if (ctx->more)
162 err = crypto_ahash_finup(&ctx->req);
163 else
164 err = crypto_ahash_digest(&ctx->req);
165 } else {
166 if (!ctx->more) {
167 err = crypto_ahash_init(&ctx->req);
Gilad Ben-Yossef2c3f8b12017-10-18 08:00:39 +0100168 err = crypto_wait_req(err, &ctx->wait);
Herbert Xufe869cd2010-10-19 21:23:00 +0800169 if (err)
170 goto unlock;
171 }
172
173 err = crypto_ahash_update(&ctx->req);
174 }
175
Gilad Ben-Yossef2c3f8b12017-10-18 08:00:39 +0100176 err = crypto_wait_req(err, &ctx->wait);
Herbert Xufe869cd2010-10-19 21:23:00 +0800177 if (err)
178 goto unlock;
179
180 ctx->more = flags & MSG_MORE;
181
182unlock:
183 release_sock(sk);
184
185 return err ?: size;
186}
187
Ying Xue1b784142015-03-02 15:37:48 +0800188static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
189 int flags)
Herbert Xufe869cd2010-10-19 21:23:00 +0800190{
191 struct sock *sk = sock->sk;
192 struct alg_sock *ask = alg_sk(sk);
193 struct hash_ctx *ctx = ask->private;
194 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
Herbert Xu493b2ed2016-09-01 17:16:44 +0800195 bool result;
Herbert Xufe869cd2010-10-19 21:23:00 +0800196 int err;
197
198 if (len > ds)
199 len = ds;
200 else if (len < ds)
201 msg->msg_flags |= MSG_TRUNC;
202
Herbert Xufe869cd2010-10-19 21:23:00 +0800203 lock_sock(sk);
Herbert Xu493b2ed2016-09-01 17:16:44 +0800204 result = ctx->result;
205 err = hash_alloc_result(sk, ctx);
206 if (err)
207 goto unlock;
208
209 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
210
Herbert Xu8acf7a12016-11-21 15:34:00 +0800211 if (!result && !ctx->more) {
Gilad Ben-Yossef2c3f8b12017-10-18 08:00:39 +0100212 err = crypto_wait_req(crypto_ahash_init(&ctx->req),
213 &ctx->wait);
Herbert Xua8348bc2016-11-17 22:07:58 +0800214 if (err)
215 goto unlock;
216 }
217
218 if (!result || ctx->more) {
Herbert Xufe869cd2010-10-19 21:23:00 +0800219 ctx->more = 0;
Gilad Ben-Yossef2c3f8b12017-10-18 08:00:39 +0100220 err = crypto_wait_req(crypto_ahash_final(&ctx->req),
221 &ctx->wait);
Herbert Xufe869cd2010-10-19 21:23:00 +0800222 if (err)
223 goto unlock;
224 }
225
Al Viro7eab8d92014-04-06 21:51:23 -0400226 err = memcpy_to_msg(msg, ctx->result, len);
Herbert Xufe869cd2010-10-19 21:23:00 +0800227
228unlock:
Herbert Xua8348bc2016-11-17 22:07:58 +0800229 hash_free_result(sk, ctx);
Herbert Xufe869cd2010-10-19 21:23:00 +0800230 release_sock(sk);
231
232 return err ?: len;
233}
234
David Howellscdfbabf2017-03-09 08:09:05 +0000235static int hash_accept(struct socket *sock, struct socket *newsock, int flags,
236 bool kern)
Herbert Xufe869cd2010-10-19 21:23:00 +0800237{
238 struct sock *sk = sock->sk;
239 struct alg_sock *ask = alg_sk(sk);
240 struct hash_ctx *ctx = ask->private;
241 struct ahash_request *req = &ctx->req;
Jiri Slaby620711942016-12-15 14:31:01 +0100242 char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req)) ? : 1];
Herbert Xufe869cd2010-10-19 21:23:00 +0800243 struct sock *sk2;
244 struct alg_sock *ask2;
245 struct hash_ctx *ctx2;
Herbert Xu4afa5f92015-11-01 17:11:19 +0800246 bool more;
Herbert Xufe869cd2010-10-19 21:23:00 +0800247 int err;
248
Herbert Xu4afa5f92015-11-01 17:11:19 +0800249 lock_sock(sk);
250 more = ctx->more;
251 err = more ? crypto_ahash_export(req, state) : 0;
252 release_sock(sk);
253
Herbert Xufe869cd2010-10-19 21:23:00 +0800254 if (err)
255 return err;
256
David Howellscdfbabf2017-03-09 08:09:05 +0000257 err = af_alg_accept(ask->parent, newsock, kern);
Herbert Xufe869cd2010-10-19 21:23:00 +0800258 if (err)
259 return err;
260
261 sk2 = newsock->sk;
262 ask2 = alg_sk(sk2);
263 ctx2 = ask2->private;
Herbert Xu4afa5f92015-11-01 17:11:19 +0800264 ctx2->more = more;
265
266 if (!more)
267 return err;
Herbert Xufe869cd2010-10-19 21:23:00 +0800268
269 err = crypto_ahash_import(&ctx2->req, state);
270 if (err) {
271 sock_orphan(sk2);
272 sock_put(sk2);
273 }
274
275 return err;
276}
277
278static struct proto_ops algif_hash_ops = {
279 .family = PF_ALG,
280
281 .connect = sock_no_connect,
282 .socketpair = sock_no_socketpair,
283 .getname = sock_no_getname,
284 .ioctl = sock_no_ioctl,
285 .listen = sock_no_listen,
286 .shutdown = sock_no_shutdown,
287 .getsockopt = sock_no_getsockopt,
288 .mmap = sock_no_mmap,
289 .bind = sock_no_bind,
290 .setsockopt = sock_no_setsockopt,
291 .poll = sock_no_poll,
292
293 .release = af_alg_release,
294 .sendmsg = hash_sendmsg,
295 .sendpage = hash_sendpage,
296 .recvmsg = hash_recvmsg,
297 .accept = hash_accept,
298};
299
Herbert Xu6de62f12016-01-08 21:31:04 +0800300static int hash_check_key(struct socket *sock)
301{
Herbert Xuad46d7e2016-01-15 22:01:08 +0800302 int err = 0;
Herbert Xu6de62f12016-01-08 21:31:04 +0800303 struct sock *psk;
304 struct alg_sock *pask;
Eric Biggers9fa68f62018-01-03 11:16:27 -0800305 struct crypto_ahash *tfm;
Herbert Xu6de62f12016-01-08 21:31:04 +0800306 struct sock *sk = sock->sk;
307 struct alg_sock *ask = alg_sk(sk);
308
Herbert Xuad46d7e2016-01-15 22:01:08 +0800309 lock_sock(sk);
Herbert Xu6de62f12016-01-08 21:31:04 +0800310 if (ask->refcnt)
Herbert Xuad46d7e2016-01-15 22:01:08 +0800311 goto unlock_child;
Herbert Xu6de62f12016-01-08 21:31:04 +0800312
313 psk = ask->parent;
314 pask = alg_sk(ask->parent);
315 tfm = pask->private;
316
317 err = -ENOKEY;
Herbert Xuad46d7e2016-01-15 22:01:08 +0800318 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
Eric Biggers9fa68f62018-01-03 11:16:27 -0800319 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
Herbert Xu6de62f12016-01-08 21:31:04 +0800320 goto unlock;
321
322 if (!pask->refcnt++)
323 sock_hold(psk);
324
325 ask->refcnt = 1;
326 sock_put(psk);
327
328 err = 0;
329
330unlock:
331 release_sock(psk);
Herbert Xuad46d7e2016-01-15 22:01:08 +0800332unlock_child:
333 release_sock(sk);
Herbert Xu6de62f12016-01-08 21:31:04 +0800334
335 return err;
336}
337
338static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
339 size_t size)
340{
341 int err;
342
343 err = hash_check_key(sock);
344 if (err)
345 return err;
346
347 return hash_sendmsg(sock, msg, size);
348}
349
350static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
351 int offset, size_t size, int flags)
352{
353 int err;
354
355 err = hash_check_key(sock);
356 if (err)
357 return err;
358
359 return hash_sendpage(sock, page, offset, size, flags);
360}
361
362static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
363 size_t ignored, int flags)
364{
365 int err;
366
367 err = hash_check_key(sock);
368 if (err)
369 return err;
370
371 return hash_recvmsg(sock, msg, ignored, flags);
372}
373
374static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
David Howellscdfbabf2017-03-09 08:09:05 +0000375 int flags, bool kern)
Herbert Xu6de62f12016-01-08 21:31:04 +0800376{
377 int err;
378
379 err = hash_check_key(sock);
380 if (err)
381 return err;
382
David Howellscdfbabf2017-03-09 08:09:05 +0000383 return hash_accept(sock, newsock, flags, kern);
Herbert Xu6de62f12016-01-08 21:31:04 +0800384}
385
386static struct proto_ops algif_hash_ops_nokey = {
387 .family = PF_ALG,
388
389 .connect = sock_no_connect,
390 .socketpair = sock_no_socketpair,
391 .getname = sock_no_getname,
392 .ioctl = sock_no_ioctl,
393 .listen = sock_no_listen,
394 .shutdown = sock_no_shutdown,
395 .getsockopt = sock_no_getsockopt,
396 .mmap = sock_no_mmap,
397 .bind = sock_no_bind,
398 .setsockopt = sock_no_setsockopt,
399 .poll = sock_no_poll,
400
401 .release = af_alg_release,
402 .sendmsg = hash_sendmsg_nokey,
403 .sendpage = hash_sendpage_nokey,
404 .recvmsg = hash_recvmsg_nokey,
405 .accept = hash_accept_nokey,
406};
407
Herbert Xufe869cd2010-10-19 21:23:00 +0800408static void *hash_bind(const char *name, u32 type, u32 mask)
409{
Eric Biggers9fa68f62018-01-03 11:16:27 -0800410 return crypto_alloc_ahash(name, type, mask);
Herbert Xufe869cd2010-10-19 21:23:00 +0800411}
412
413static void hash_release(void *private)
414{
Eric Biggers9fa68f62018-01-03 11:16:27 -0800415 crypto_free_ahash(private);
Herbert Xufe869cd2010-10-19 21:23:00 +0800416}
417
418static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
419{
Eric Biggers9fa68f62018-01-03 11:16:27 -0800420 return crypto_ahash_setkey(private, key, keylen);
Herbert Xufe869cd2010-10-19 21:23:00 +0800421}
422
Herbert Xuf1d84af2016-01-13 15:00:36 +0800423static void hash_sock_destruct(struct sock *sk)
Herbert Xufe869cd2010-10-19 21:23:00 +0800424{
425 struct alg_sock *ask = alg_sk(sk);
426 struct hash_ctx *ctx = ask->private;
427
Herbert Xu493b2ed2016-09-01 17:16:44 +0800428 hash_free_result(sk, ctx);
Herbert Xufe869cd2010-10-19 21:23:00 +0800429 sock_kfree_s(sk, ctx, ctx->len);
430 af_alg_release_parent(sk);
431}
432
Herbert Xuf1d84af2016-01-13 15:00:36 +0800433static int hash_accept_parent_nokey(void *private, struct sock *sk)
Herbert Xufe869cd2010-10-19 21:23:00 +0800434{
Eric Biggers9fa68f62018-01-03 11:16:27 -0800435 struct crypto_ahash *tfm = private;
Herbert Xufe869cd2010-10-19 21:23:00 +0800436 struct alg_sock *ask = alg_sk(sk);
Eric Biggers9fa68f62018-01-03 11:16:27 -0800437 struct hash_ctx *ctx;
438 unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
Herbert Xufe869cd2010-10-19 21:23:00 +0800439
440 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
441 if (!ctx)
442 return -ENOMEM;
443
Herbert Xu493b2ed2016-09-01 17:16:44 +0800444 ctx->result = NULL;
Herbert Xufe869cd2010-10-19 21:23:00 +0800445 ctx->len = len;
446 ctx->more = 0;
Gilad Ben-Yossef2c3f8b12017-10-18 08:00:39 +0100447 crypto_init_wait(&ctx->wait);
Herbert Xufe869cd2010-10-19 21:23:00 +0800448
449 ask->private = ctx;
450
Eric Biggers9fa68f62018-01-03 11:16:27 -0800451 ahash_request_set_tfm(&ctx->req, tfm);
Herbert Xufe869cd2010-10-19 21:23:00 +0800452 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
Gilad Ben-Yossef2c3f8b12017-10-18 08:00:39 +0100453 crypto_req_done, &ctx->wait);
Herbert Xufe869cd2010-10-19 21:23:00 +0800454
455 sk->sk_destruct = hash_sock_destruct;
456
457 return 0;
458}
459
Herbert Xu6de62f12016-01-08 21:31:04 +0800460static int hash_accept_parent(void *private, struct sock *sk)
461{
Eric Biggers9fa68f62018-01-03 11:16:27 -0800462 struct crypto_ahash *tfm = private;
Herbert Xu6de62f12016-01-08 21:31:04 +0800463
Eric Biggers9fa68f62018-01-03 11:16:27 -0800464 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
Herbert Xu6de62f12016-01-08 21:31:04 +0800465 return -ENOKEY;
466
Herbert Xuf1d84af2016-01-13 15:00:36 +0800467 return hash_accept_parent_nokey(private, sk);
Herbert Xu6de62f12016-01-08 21:31:04 +0800468}
469
Herbert Xufe869cd2010-10-19 21:23:00 +0800470static const struct af_alg_type algif_type_hash = {
471 .bind = hash_bind,
472 .release = hash_release,
473 .setkey = hash_setkey,
474 .accept = hash_accept_parent,
Herbert Xu6de62f12016-01-08 21:31:04 +0800475 .accept_nokey = hash_accept_parent_nokey,
Herbert Xufe869cd2010-10-19 21:23:00 +0800476 .ops = &algif_hash_ops,
Herbert Xu6de62f12016-01-08 21:31:04 +0800477 .ops_nokey = &algif_hash_ops_nokey,
Herbert Xufe869cd2010-10-19 21:23:00 +0800478 .name = "hash",
479 .owner = THIS_MODULE
480};
481
482static int __init algif_hash_init(void)
483{
484 return af_alg_register_type(&algif_type_hash);
485}
486
487static void __exit algif_hash_exit(void)
488{
489 int err = af_alg_unregister_type(&algif_type_hash);
490 BUG_ON(err);
491}
492
493module_init(algif_hash_init);
494module_exit(algif_hash_exit);
495MODULE_LICENSE("GPL");