1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * algif_skcipher: User-space interface for skcipher algorithms
4 *
5 * This file provides the user-space API for symmetric key ciphers.
6 *
7 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
8 *
9 * The following concept of the memory management is used:
10 *
11 * The kernel maintains two SGLs, the TX SGL and the RX SGL. The TX SGL is
12 * filled by user space with the data submitted via sendmsg. Filling up the TX
13 * SGL does not cause a crypto operation -- the data will only be tracked by
14 * the kernel. Upon receipt of one recvmsg call, the caller must provide a
15 * buffer which is tracked with the RX SGL.
16 *
17 * During the processing of the recvmsg operation, the cipher request is
18 * allocated and prepared. As part of the recvmsg operation, the processed
19 * TX buffers are extracted from the TX SGL into a separate SGL.
20 *
21 * After the completion of the crypto operation, the RX SGL and the cipher
22 * request is released. The extracted TX SGL parts are released together with
23 * the RX SGL release.
24 */
25
26#include <crypto/scatterwalk.h>
27#include <crypto/skcipher.h>
28#include <crypto/if_alg.h>
29#include <linux/init.h>
30#include <linux/list.h>
31#include <linux/kernel.h>
32#include <linux/mm.h>
33#include <linux/module.h>
34#include <linux/net.h>
35#include <net/sock.h>
36
37static int skcipher_sendmsg(struct socket *sock, struct msghdr *msg,
38 size_t size)
39{
40 struct sock *sk = sock->sk;
41 struct alg_sock *ask = alg_sk(sk);
42 struct sock *psk = ask->parent;
43 struct alg_sock *pask = alg_sk(sk: psk);
44 struct crypto_skcipher *tfm = pask->private;
45 unsigned ivsize = crypto_skcipher_ivsize(tfm);
46
47 return af_alg_sendmsg(sock, msg, size, ivsize);
48}
49
50static int algif_skcipher_export(struct sock *sk, struct skcipher_request *req)
51{
52 struct alg_sock *ask = alg_sk(sk);
53 struct crypto_skcipher *tfm;
54 struct af_alg_ctx *ctx;
55 struct alg_sock *pask;
56 unsigned statesize;
57 struct sock *psk;
58 int err;
59
60 if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL))
61 return 0;
62
63 ctx = ask->private;
64 psk = ask->parent;
65 pask = alg_sk(sk: psk);
66 tfm = pask->private;
67
68 statesize = crypto_skcipher_statesize(tfm);
69 ctx->state = sock_kmalloc(sk, size: statesize, GFP_ATOMIC);
70 if (!ctx->state)
71 return -ENOMEM;
72
73 err = crypto_skcipher_export(req, out: ctx->state);
74 if (err) {
75 sock_kzfree_s(sk, mem: ctx->state, size: statesize);
76 ctx->state = NULL;
77 }
78
79 return err;
80}
81
82static void algif_skcipher_done(void *data, int err)
83{
84 struct af_alg_async_req *areq = data;
85 struct sock *sk = areq->sk;
86
87 if (err)
88 goto out;
89
90 err = algif_skcipher_export(sk, req: &areq->cra_u.skcipher_req);
91
92out:
93 af_alg_async_cb(data, err);
94}
95
96static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
97 size_t ignored, int flags)
98{
99 struct sock *sk = sock->sk;
100 struct alg_sock *ask = alg_sk(sk);
101 struct sock *psk = ask->parent;
102 struct alg_sock *pask = alg_sk(sk: psk);
103 struct af_alg_ctx *ctx = ask->private;
104 struct crypto_skcipher *tfm = pask->private;
105 unsigned int bs = crypto_skcipher_chunksize(tfm);
106 struct af_alg_async_req *areq;
107 unsigned cflags = 0;
108 int err = 0;
109 size_t len = 0;
110
111 if (!ctx->init || (ctx->more && ctx->used < bs)) {
112 err = af_alg_wait_for_data(sk, flags, min: bs);
113 if (err)
114 return err;
115 }
116
117 /* Allocate cipher request for current operation. */
118 areq = af_alg_alloc_areq(sk, areqlen: sizeof(struct af_alg_async_req) +
119 crypto_skcipher_reqsize(tfm));
120 if (IS_ERR(ptr: areq))
121 return PTR_ERR(ptr: areq);
122
123 /* convert iovecs of output buffers into RX SGL */
124 err = af_alg_get_rsgl(sk, msg, flags, areq, maxsize: ctx->used, outlen: &len);
125 if (err)
126 goto free;
127
128 /*
129 * If more buffers are to be expected to be processed, process only
130 * full block size buffers.
131 */
132 if (ctx->more || len < ctx->used) {
133 len -= len % bs;
134 cflags |= CRYPTO_SKCIPHER_REQ_NOTFINAL;
135 }
136
137 /*
138 * Create a per request TX SGL for this request which tracks the
139 * SG entries from the global TX SGL.
140 */
141 areq->tsgl_entries = af_alg_count_tsgl(sk, bytes: len, offset: 0);
142 if (!areq->tsgl_entries)
143 areq->tsgl_entries = 1;
144 areq->tsgl = sock_kmalloc(sk, array_size(sizeof(*areq->tsgl),
145 areq->tsgl_entries),
146 GFP_KERNEL);
147 if (!areq->tsgl) {
148 err = -ENOMEM;
149 goto free;
150 }
151 sg_init_table(areq->tsgl, areq->tsgl_entries);
152 af_alg_pull_tsgl(sk, used: len, dst: areq->tsgl, dst_offset: 0);
153
154 /* Initialize the crypto operation */
155 skcipher_request_set_tfm(req: &areq->cra_u.skcipher_req, tfm);
156 skcipher_request_set_crypt(req: &areq->cra_u.skcipher_req, src: areq->tsgl,
157 dst: areq->first_rsgl.sgl.sgt.sgl, cryptlen: len, iv: ctx->iv);
158
159 if (ctx->state) {
160 err = crypto_skcipher_import(req: &areq->cra_u.skcipher_req,
161 in: ctx->state);
162 sock_kzfree_s(sk, mem: ctx->state, size: crypto_skcipher_statesize(tfm));
163 ctx->state = NULL;
164 if (err)
165 goto free;
166 cflags |= CRYPTO_SKCIPHER_REQ_CONT;
167 }
168
169 if (msg->msg_iocb && !is_sync_kiocb(kiocb: msg->msg_iocb)) {
170 /* AIO operation */
171 sock_hold(sk);
172 areq->iocb = msg->msg_iocb;
173
174 /* Remember output size that will be generated. */
175 areq->outlen = len;
176
177 skcipher_request_set_callback(req: &areq->cra_u.skcipher_req,
178 flags: cflags |
179 CRYPTO_TFM_REQ_MAY_SLEEP,
180 compl: algif_skcipher_done, data: areq);
181 err = ctx->enc ?
182 crypto_skcipher_encrypt(req: &areq->cra_u.skcipher_req) :
183 crypto_skcipher_decrypt(req: &areq->cra_u.skcipher_req);
184
185 /* AIO operation in progress */
186 if (err == -EINPROGRESS)
187 return -EIOCBQUEUED;
188
189 sock_put(sk);
190 } else {
191 /* Synchronous operation */
192 skcipher_request_set_callback(req: &areq->cra_u.skcipher_req,
193 flags: cflags |
194 CRYPTO_TFM_REQ_MAY_SLEEP |
195 CRYPTO_TFM_REQ_MAY_BACKLOG,
196 compl: crypto_req_done, data: &ctx->wait);
197 err = crypto_wait_req(err: ctx->enc ?
198 crypto_skcipher_encrypt(req: &areq->cra_u.skcipher_req) :
199 crypto_skcipher_decrypt(req: &areq->cra_u.skcipher_req),
200 wait: &ctx->wait);
201
202 if (!err)
203 err = algif_skcipher_export(
204 sk, req: &areq->cra_u.skcipher_req);
205 }
206
207free:
208 af_alg_free_resources(areq);
209
210 return err ? err : len;
211}
212
213static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
214 size_t ignored, int flags)
215{
216 struct sock *sk = sock->sk;
217 int ret = 0;
218
219 lock_sock(sk);
220 while (msg_data_left(msg)) {
221 int err = _skcipher_recvmsg(sock, msg, ignored, flags);
222
223 /*
224 * This error covers -EIOCBQUEUED which implies that we can
225 * only handle one AIO request. If the caller wants to have
226 * multiple AIO requests in parallel, he must make multiple
227 * separate AIO calls.
228 *
229 * Also return the error if no data has been processed so far.
230 */
231 if (err <= 0) {
232 if (err == -EIOCBQUEUED || !ret)
233 ret = err;
234 goto out;
235 }
236
237 ret += err;
238 }
239
240out:
241 af_alg_wmem_wakeup(sk);
242 release_sock(sk);
243 return ret;
244}
245
246static struct proto_ops algif_skcipher_ops = {
247 .family = PF_ALG,
248
249 .connect = sock_no_connect,
250 .socketpair = sock_no_socketpair,
251 .getname = sock_no_getname,
252 .ioctl = sock_no_ioctl,
253 .listen = sock_no_listen,
254 .shutdown = sock_no_shutdown,
255 .mmap = sock_no_mmap,
256 .bind = sock_no_bind,
257 .accept = sock_no_accept,
258
259 .release = af_alg_release,
260 .sendmsg = skcipher_sendmsg,
261 .recvmsg = skcipher_recvmsg,
262 .poll = af_alg_poll,
263};
264
265static int skcipher_check_key(struct socket *sock)
266{
267 int err = 0;
268 struct sock *psk;
269 struct alg_sock *pask;
270 struct crypto_skcipher *tfm;
271 struct sock *sk = sock->sk;
272 struct alg_sock *ask = alg_sk(sk);
273
274 lock_sock(sk);
275 if (!atomic_read(v: &ask->nokey_refcnt))
276 goto unlock_child;
277
278 psk = ask->parent;
279 pask = alg_sk(sk: ask->parent);
280 tfm = pask->private;
281
282 err = -ENOKEY;
283 lock_sock_nested(sk: psk, SINGLE_DEPTH_NESTING);
284 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
285 goto unlock;
286
287 atomic_dec(v: &pask->nokey_refcnt);
288 atomic_set(v: &ask->nokey_refcnt, i: 0);
289
290 err = 0;
291
292unlock:
293 release_sock(sk: psk);
294unlock_child:
295 release_sock(sk);
296
297 return err;
298}
299
300static int skcipher_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
301 size_t size)
302{
303 int err;
304
305 err = skcipher_check_key(sock);
306 if (err)
307 return err;
308
309 return skcipher_sendmsg(sock, msg, size);
310}
311
312static int skcipher_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
313 size_t ignored, int flags)
314{
315 int err;
316
317 err = skcipher_check_key(sock);
318 if (err)
319 return err;
320
321 return skcipher_recvmsg(sock, msg, ignored, flags);
322}
323
324static struct proto_ops algif_skcipher_ops_nokey = {
325 .family = PF_ALG,
326
327 .connect = sock_no_connect,
328 .socketpair = sock_no_socketpair,
329 .getname = sock_no_getname,
330 .ioctl = sock_no_ioctl,
331 .listen = sock_no_listen,
332 .shutdown = sock_no_shutdown,
333 .mmap = sock_no_mmap,
334 .bind = sock_no_bind,
335 .accept = sock_no_accept,
336
337 .release = af_alg_release,
338 .sendmsg = skcipher_sendmsg_nokey,
339 .recvmsg = skcipher_recvmsg_nokey,
340 .poll = af_alg_poll,
341};
342
343static void *skcipher_bind(const char *name, u32 type, u32 mask)
344{
345 return crypto_alloc_skcipher(alg_name: name, type, mask);
346}
347
348static void skcipher_release(void *private)
349{
350 crypto_free_skcipher(tfm: private);
351}
352
353static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
354{
355 return crypto_skcipher_setkey(tfm: private, key, keylen);
356}
357
358static void skcipher_sock_destruct(struct sock *sk)
359{
360 struct alg_sock *ask = alg_sk(sk);
361 struct af_alg_ctx *ctx = ask->private;
362 struct sock *psk = ask->parent;
363 struct alg_sock *pask = alg_sk(sk: psk);
364 struct crypto_skcipher *tfm = pask->private;
365
366 af_alg_pull_tsgl(sk, used: ctx->used, NULL, dst_offset: 0);
367 sock_kzfree_s(sk, mem: ctx->iv, size: crypto_skcipher_ivsize(tfm));
368 if (ctx->state)
369 sock_kzfree_s(sk, mem: ctx->state, size: crypto_skcipher_statesize(tfm));
370 sock_kfree_s(sk, mem: ctx, size: ctx->len);
371 af_alg_release_parent(sk);
372}
373
374static int skcipher_accept_parent_nokey(void *private, struct sock *sk)
375{
376 struct af_alg_ctx *ctx;
377 struct alg_sock *ask = alg_sk(sk);
378 struct crypto_skcipher *tfm = private;
379 unsigned int len = sizeof(*ctx);
380
381 ctx = sock_kmalloc(sk, size: len, GFP_KERNEL);
382 if (!ctx)
383 return -ENOMEM;
384 memset(ctx, 0, len);
385
386 ctx->iv = sock_kmalloc(sk, size: crypto_skcipher_ivsize(tfm),
387 GFP_KERNEL);
388 if (!ctx->iv) {
389 sock_kfree_s(sk, mem: ctx, size: len);
390 return -ENOMEM;
391 }
392 memset(ctx->iv, 0, crypto_skcipher_ivsize(tfm));
393
394 INIT_LIST_HEAD(list: &ctx->tsgl_list);
395 ctx->len = len;
396 crypto_init_wait(wait: &ctx->wait);
397
398 ask->private = ctx;
399
400 sk->sk_destruct = skcipher_sock_destruct;
401
402 return 0;
403}
404
405static int skcipher_accept_parent(void *private, struct sock *sk)
406{
407 struct crypto_skcipher *tfm = private;
408
409 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
410 return -ENOKEY;
411
412 return skcipher_accept_parent_nokey(private, sk);
413}
414
415static const struct af_alg_type algif_type_skcipher = {
416 .bind = skcipher_bind,
417 .release = skcipher_release,
418 .setkey = skcipher_setkey,
419 .accept = skcipher_accept_parent,
420 .accept_nokey = skcipher_accept_parent_nokey,
421 .ops = &algif_skcipher_ops,
422 .ops_nokey = &algif_skcipher_ops_nokey,
423 .name = "skcipher",
424 .owner = THIS_MODULE
425};
426
427static int __init algif_skcipher_init(void)
428{
429 return af_alg_register_type(type: &algif_type_skcipher);
430}
431
432static void __exit algif_skcipher_exit(void)
433{
434 int err = af_alg_unregister_type(type: &algif_type_skcipher);
435 BUG_ON(err);
436}
437
438module_init(algif_skcipher_init);
439module_exit(algif_skcipher_exit);
440MODULE_LICENSE("GPL");
441

source code of linux/crypto/algif_skcipher.c