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TOMOYO Linux Cross Reference
Linux/crypto/algif_aead.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * algif_aead: User-space interface for AEAD algorithms
  4  *
  5  * Copyright (C) 2014, Stephan Mueller <smueller@chronox.de>
  6  *
  7  * This file provides the user-space API for AEAD ciphers.
  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 sendpage/sendmsg. Filling
 13  * up the TX SGL does not cause a crypto operation -- the data will only be
 14  * tracked by the kernel. Upon receipt of one recvmsg call, the caller must
 15  * provide a 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/internal/aead.h>
 27 #include <crypto/scatterwalk.h>
 28 #include <crypto/if_alg.h>
 29 #include <crypto/skcipher.h>
 30 #include <crypto/null.h>
 31 #include <linux/init.h>
 32 #include <linux/list.h>
 33 #include <linux/kernel.h>
 34 #include <linux/mm.h>
 35 #include <linux/module.h>
 36 #include <linux/net.h>
 37 #include <net/sock.h>
 38 
 39 struct aead_tfm {
 40         struct crypto_aead *aead;
 41         struct crypto_sync_skcipher *null_tfm;
 42 };
 43 
 44 static inline bool aead_sufficient_data(struct sock *sk)
 45 {
 46         struct alg_sock *ask = alg_sk(sk);
 47         struct sock *psk = ask->parent;
 48         struct alg_sock *pask = alg_sk(psk);
 49         struct af_alg_ctx *ctx = ask->private;
 50         struct aead_tfm *aeadc = pask->private;
 51         struct crypto_aead *tfm = aeadc->aead;
 52         unsigned int as = crypto_aead_authsize(tfm);
 53 
 54         /*
 55          * The minimum amount of memory needed for an AEAD cipher is
 56          * the AAD and in case of decryption the tag.
 57          */
 58         return ctx->used >= ctx->aead_assoclen + (ctx->enc ? 0 : as);
 59 }
 60 
 61 static int aead_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 62 {
 63         struct sock *sk = sock->sk;
 64         struct alg_sock *ask = alg_sk(sk);
 65         struct sock *psk = ask->parent;
 66         struct alg_sock *pask = alg_sk(psk);
 67         struct aead_tfm *aeadc = pask->private;
 68         struct crypto_aead *tfm = aeadc->aead;
 69         unsigned int ivsize = crypto_aead_ivsize(tfm);
 70 
 71         return af_alg_sendmsg(sock, msg, size, ivsize);
 72 }
 73 
 74 static int crypto_aead_copy_sgl(struct crypto_sync_skcipher *null_tfm,
 75                                 struct scatterlist *src,
 76                                 struct scatterlist *dst, unsigned int len)
 77 {
 78         SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, null_tfm);
 79 
 80         skcipher_request_set_sync_tfm(skreq, null_tfm);
 81         skcipher_request_set_callback(skreq, CRYPTO_TFM_REQ_MAY_BACKLOG,
 82                                       NULL, NULL);
 83         skcipher_request_set_crypt(skreq, src, dst, len, NULL);
 84 
 85         return crypto_skcipher_encrypt(skreq);
 86 }
 87 
 88 static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
 89                          size_t ignored, int flags)
 90 {
 91         struct sock *sk = sock->sk;
 92         struct alg_sock *ask = alg_sk(sk);
 93         struct sock *psk = ask->parent;
 94         struct alg_sock *pask = alg_sk(psk);
 95         struct af_alg_ctx *ctx = ask->private;
 96         struct aead_tfm *aeadc = pask->private;
 97         struct crypto_aead *tfm = aeadc->aead;
 98         struct crypto_sync_skcipher *null_tfm = aeadc->null_tfm;
 99         unsigned int i, as = crypto_aead_authsize(tfm);
100         struct af_alg_async_req *areq;
101         struct af_alg_tsgl *tsgl, *tmp;
102         struct scatterlist *rsgl_src, *tsgl_src = NULL;
103         int err = 0;
104         size_t used = 0;                /* [in]  TX bufs to be en/decrypted */
105         size_t outlen = 0;              /* [out] RX bufs produced by kernel */
106         size_t usedpages = 0;           /* [in]  RX bufs to be used from user */
107         size_t processed = 0;           /* [in]  TX bufs to be consumed */
108 
109         if (!ctx->used) {
110                 err = af_alg_wait_for_data(sk, flags);
111                 if (err)
112                         return err;
113         }
114 
115         /*
116          * Data length provided by caller via sendmsg/sendpage that has not
117          * yet been processed.
118          */
119         used = ctx->used;
120 
121         /*
122          * Make sure sufficient data is present -- note, the same check is
123          * is also present in sendmsg/sendpage. The checks in sendpage/sendmsg
124          * shall provide an information to the data sender that something is
125          * wrong, but they are irrelevant to maintain the kernel integrity.
126          * We need this check here too in case user space decides to not honor
127          * the error message in sendmsg/sendpage and still call recvmsg. This
128          * check here protects the kernel integrity.
129          */
130         if (!aead_sufficient_data(sk))
131                 return -EINVAL;
132 
133         /*
134          * Calculate the minimum output buffer size holding the result of the
135          * cipher operation. When encrypting data, the receiving buffer is
136          * larger by the tag length compared to the input buffer as the
137          * encryption operation generates the tag. For decryption, the input
138          * buffer provides the tag which is consumed resulting in only the
139          * plaintext without a buffer for the tag returned to the caller.
140          */
141         if (ctx->enc)
142                 outlen = used + as;
143         else
144                 outlen = used - as;
145 
146         /*
147          * The cipher operation input data is reduced by the associated data
148          * length as this data is processed separately later on.
149          */
150         used -= ctx->aead_assoclen;
151 
152         /* Allocate cipher request for current operation. */
153         areq = af_alg_alloc_areq(sk, sizeof(struct af_alg_async_req) +
154                                      crypto_aead_reqsize(tfm));
155         if (IS_ERR(areq))
156                 return PTR_ERR(areq);
157 
158         /* convert iovecs of output buffers into RX SGL */
159         err = af_alg_get_rsgl(sk, msg, flags, areq, outlen, &usedpages);
160         if (err)
161                 goto free;
162 
163         /*
164          * Ensure output buffer is sufficiently large. If the caller provides
165          * less buffer space, only use the relative required input size. This
166          * allows AIO operation where the caller sent all data to be processed
167          * and the AIO operation performs the operation on the different chunks
168          * of the input data.
169          */
170         if (usedpages < outlen) {
171                 size_t less = outlen - usedpages;
172 
173                 if (used < less) {
174                         err = -EINVAL;
175                         goto free;
176                 }
177                 used -= less;
178                 outlen -= less;
179         }
180 
181         processed = used + ctx->aead_assoclen;
182         list_for_each_entry_safe(tsgl, tmp, &ctx->tsgl_list, list) {
183                 for (i = 0; i < tsgl->cur; i++) {
184                         struct scatterlist *process_sg = tsgl->sg + i;
185 
186                         if (!(process_sg->length) || !sg_page(process_sg))
187                                 continue;
188                         tsgl_src = process_sg;
189                         break;
190                 }
191                 if (tsgl_src)
192                         break;
193         }
194         if (processed && !tsgl_src) {
195                 err = -EFAULT;
196                 goto free;
197         }
198 
199         /*
200          * Copy of AAD from source to destination
201          *
202          * The AAD is copied to the destination buffer without change. Even
203          * when user space uses an in-place cipher operation, the kernel
204          * will copy the data as it does not see whether such in-place operation
205          * is initiated.
206          *
207          * To ensure efficiency, the following implementation ensure that the
208          * ciphers are invoked to perform a crypto operation in-place. This
209          * is achieved by memory management specified as follows.
210          */
211 
212         /* Use the RX SGL as source (and destination) for crypto op. */
213         rsgl_src = areq->first_rsgl.sgl.sg;
214 
215         if (ctx->enc) {
216                 /*
217                  * Encryption operation - The in-place cipher operation is
218                  * achieved by the following operation:
219                  *
220                  * TX SGL: AAD || PT
221                  *          |      |
222                  *          | copy |
223                  *          v      v
224                  * RX SGL: AAD || PT || Tag
225                  */
226                 err = crypto_aead_copy_sgl(null_tfm, tsgl_src,
227                                            areq->first_rsgl.sgl.sg, processed);
228                 if (err)
229                         goto free;
230                 af_alg_pull_tsgl(sk, processed, NULL, 0);
231         } else {
232                 /*
233                  * Decryption operation - To achieve an in-place cipher
234                  * operation, the following  SGL structure is used:
235                  *
236                  * TX SGL: AAD || CT || Tag
237                  *          |      |     ^
238                  *          | copy |     | Create SGL link.
239                  *          v      v     |
240                  * RX SGL: AAD || CT ----+
241                  */
242 
243                  /* Copy AAD || CT to RX SGL buffer for in-place operation. */
244                 err = crypto_aead_copy_sgl(null_tfm, tsgl_src,
245                                            areq->first_rsgl.sgl.sg, outlen);
246                 if (err)
247                         goto free;
248 
249                 /* Create TX SGL for tag and chain it to RX SGL. */
250                 areq->tsgl_entries = af_alg_count_tsgl(sk, processed,
251                                                        processed - as);
252                 if (!areq->tsgl_entries)
253                         areq->tsgl_entries = 1;
254                 areq->tsgl = sock_kmalloc(sk, array_size(sizeof(*areq->tsgl),
255                                                          areq->tsgl_entries),
256                                           GFP_KERNEL);
257                 if (!areq->tsgl) {
258                         err = -ENOMEM;
259                         goto free;
260                 }
261                 sg_init_table(areq->tsgl, areq->tsgl_entries);
262 
263                 /* Release TX SGL, except for tag data and reassign tag data. */
264                 af_alg_pull_tsgl(sk, processed, areq->tsgl, processed - as);
265 
266                 /* chain the areq TX SGL holding the tag with RX SGL */
267                 if (usedpages) {
268                         /* RX SGL present */
269                         struct af_alg_sgl *sgl_prev = &areq->last_rsgl->sgl;
270 
271                         sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
272                         sg_chain(sgl_prev->sg, sgl_prev->npages + 1,
273                                  areq->tsgl);
274                 } else
275                         /* no RX SGL present (e.g. authentication only) */
276                         rsgl_src = areq->tsgl;
277         }
278 
279         /* Initialize the crypto operation */
280         aead_request_set_crypt(&areq->cra_u.aead_req, rsgl_src,
281                                areq->first_rsgl.sgl.sg, used, ctx->iv);
282         aead_request_set_ad(&areq->cra_u.aead_req, ctx->aead_assoclen);
283         aead_request_set_tfm(&areq->cra_u.aead_req, tfm);
284 
285         if (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) {
286                 /* AIO operation */
287                 sock_hold(sk);
288                 areq->iocb = msg->msg_iocb;
289 
290                 /* Remember output size that will be generated. */
291                 areq->outlen = outlen;
292 
293                 aead_request_set_callback(&areq->cra_u.aead_req,
294                                           CRYPTO_TFM_REQ_MAY_BACKLOG,
295                                           af_alg_async_cb, areq);
296                 err = ctx->enc ? crypto_aead_encrypt(&areq->cra_u.aead_req) :
297                                  crypto_aead_decrypt(&areq->cra_u.aead_req);
298 
299                 /* AIO operation in progress */
300                 if (err == -EINPROGRESS || err == -EBUSY)
301                         return -EIOCBQUEUED;
302 
303                 sock_put(sk);
304         } else {
305                 /* Synchronous operation */
306                 aead_request_set_callback(&areq->cra_u.aead_req,
307                                           CRYPTO_TFM_REQ_MAY_BACKLOG,
308                                           crypto_req_done, &ctx->wait);
309                 err = crypto_wait_req(ctx->enc ?
310                                 crypto_aead_encrypt(&areq->cra_u.aead_req) :
311                                 crypto_aead_decrypt(&areq->cra_u.aead_req),
312                                 &ctx->wait);
313         }
314 
315 
316 free:
317         af_alg_free_resources(areq);
318 
319         return err ? err : outlen;
320 }
321 
322 static int aead_recvmsg(struct socket *sock, struct msghdr *msg,
323                         size_t ignored, int flags)
324 {
325         struct sock *sk = sock->sk;
326         int ret = 0;
327 
328         lock_sock(sk);
329         while (msg_data_left(msg)) {
330                 int err = _aead_recvmsg(sock, msg, ignored, flags);
331 
332                 /*
333                  * This error covers -EIOCBQUEUED which implies that we can
334                  * only handle one AIO request. If the caller wants to have
335                  * multiple AIO requests in parallel, he must make multiple
336                  * separate AIO calls.
337                  *
338                  * Also return the error if no data has been processed so far.
339                  */
340                 if (err <= 0) {
341                         if (err == -EIOCBQUEUED || err == -EBADMSG || !ret)
342                                 ret = err;
343                         goto out;
344                 }
345 
346                 ret += err;
347         }
348 
349 out:
350         af_alg_wmem_wakeup(sk);
351         release_sock(sk);
352         return ret;
353 }
354 
355 static struct proto_ops algif_aead_ops = {
356         .family         =       PF_ALG,
357 
358         .connect        =       sock_no_connect,
359         .socketpair     =       sock_no_socketpair,
360         .getname        =       sock_no_getname,
361         .ioctl          =       sock_no_ioctl,
362         .listen         =       sock_no_listen,
363         .shutdown       =       sock_no_shutdown,
364         .getsockopt     =       sock_no_getsockopt,
365         .mmap           =       sock_no_mmap,
366         .bind           =       sock_no_bind,
367         .accept         =       sock_no_accept,
368         .setsockopt     =       sock_no_setsockopt,
369 
370         .release        =       af_alg_release,
371         .sendmsg        =       aead_sendmsg,
372         .sendpage       =       af_alg_sendpage,
373         .recvmsg        =       aead_recvmsg,
374         .poll           =       af_alg_poll,
375 };
376 
377 static int aead_check_key(struct socket *sock)
378 {
379         int err = 0;
380         struct sock *psk;
381         struct alg_sock *pask;
382         struct aead_tfm *tfm;
383         struct sock *sk = sock->sk;
384         struct alg_sock *ask = alg_sk(sk);
385 
386         lock_sock(sk);
387         if (ask->refcnt)
388                 goto unlock_child;
389 
390         psk = ask->parent;
391         pask = alg_sk(ask->parent);
392         tfm = pask->private;
393 
394         err = -ENOKEY;
395         lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
396         if (crypto_aead_get_flags(tfm->aead) & CRYPTO_TFM_NEED_KEY)
397                 goto unlock;
398 
399         if (!pask->refcnt++)
400                 sock_hold(psk);
401 
402         ask->refcnt = 1;
403         sock_put(psk);
404 
405         err = 0;
406 
407 unlock:
408         release_sock(psk);
409 unlock_child:
410         release_sock(sk);
411 
412         return err;
413 }
414 
415 static int aead_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
416                                   size_t size)
417 {
418         int err;
419 
420         err = aead_check_key(sock);
421         if (err)
422                 return err;
423 
424         return aead_sendmsg(sock, msg, size);
425 }
426 
427 static ssize_t aead_sendpage_nokey(struct socket *sock, struct page *page,
428                                        int offset, size_t size, int flags)
429 {
430         int err;
431 
432         err = aead_check_key(sock);
433         if (err)
434                 return err;
435 
436         return af_alg_sendpage(sock, page, offset, size, flags);
437 }
438 
439 static int aead_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
440                                   size_t ignored, int flags)
441 {
442         int err;
443 
444         err = aead_check_key(sock);
445         if (err)
446                 return err;
447 
448         return aead_recvmsg(sock, msg, ignored, flags);
449 }
450 
451 static struct proto_ops algif_aead_ops_nokey = {
452         .family         =       PF_ALG,
453 
454         .connect        =       sock_no_connect,
455         .socketpair     =       sock_no_socketpair,
456         .getname        =       sock_no_getname,
457         .ioctl          =       sock_no_ioctl,
458         .listen         =       sock_no_listen,
459         .shutdown       =       sock_no_shutdown,
460         .getsockopt     =       sock_no_getsockopt,
461         .mmap           =       sock_no_mmap,
462         .bind           =       sock_no_bind,
463         .accept         =       sock_no_accept,
464         .setsockopt     =       sock_no_setsockopt,
465 
466         .release        =       af_alg_release,
467         .sendmsg        =       aead_sendmsg_nokey,
468         .sendpage       =       aead_sendpage_nokey,
469         .recvmsg        =       aead_recvmsg_nokey,
470         .poll           =       af_alg_poll,
471 };
472 
473 static void *aead_bind(const char *name, u32 type, u32 mask)
474 {
475         struct aead_tfm *tfm;
476         struct crypto_aead *aead;
477         struct crypto_sync_skcipher *null_tfm;
478 
479         tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
480         if (!tfm)
481                 return ERR_PTR(-ENOMEM);
482 
483         aead = crypto_alloc_aead(name, type, mask);
484         if (IS_ERR(aead)) {
485                 kfree(tfm);
486                 return ERR_CAST(aead);
487         }
488 
489         null_tfm = crypto_get_default_null_skcipher();
490         if (IS_ERR(null_tfm)) {
491                 crypto_free_aead(aead);
492                 kfree(tfm);
493                 return ERR_CAST(null_tfm);
494         }
495 
496         tfm->aead = aead;
497         tfm->null_tfm = null_tfm;
498 
499         return tfm;
500 }
501 
502 static void aead_release(void *private)
503 {
504         struct aead_tfm *tfm = private;
505 
506         crypto_free_aead(tfm->aead);
507         crypto_put_default_null_skcipher();
508         kfree(tfm);
509 }
510 
511 static int aead_setauthsize(void *private, unsigned int authsize)
512 {
513         struct aead_tfm *tfm = private;
514 
515         return crypto_aead_setauthsize(tfm->aead, authsize);
516 }
517 
518 static int aead_setkey(void *private, const u8 *key, unsigned int keylen)
519 {
520         struct aead_tfm *tfm = private;
521 
522         return crypto_aead_setkey(tfm->aead, key, keylen);
523 }
524 
525 static void aead_sock_destruct(struct sock *sk)
526 {
527         struct alg_sock *ask = alg_sk(sk);
528         struct af_alg_ctx *ctx = ask->private;
529         struct sock *psk = ask->parent;
530         struct alg_sock *pask = alg_sk(psk);
531         struct aead_tfm *aeadc = pask->private;
532         struct crypto_aead *tfm = aeadc->aead;
533         unsigned int ivlen = crypto_aead_ivsize(tfm);
534 
535         af_alg_pull_tsgl(sk, ctx->used, NULL, 0);
536         sock_kzfree_s(sk, ctx->iv, ivlen);
537         sock_kfree_s(sk, ctx, ctx->len);
538         af_alg_release_parent(sk);
539 }
540 
541 static int aead_accept_parent_nokey(void *private, struct sock *sk)
542 {
543         struct af_alg_ctx *ctx;
544         struct alg_sock *ask = alg_sk(sk);
545         struct aead_tfm *tfm = private;
546         struct crypto_aead *aead = tfm->aead;
547         unsigned int len = sizeof(*ctx);
548         unsigned int ivlen = crypto_aead_ivsize(aead);
549 
550         ctx = sock_kmalloc(sk, len, GFP_KERNEL);
551         if (!ctx)
552                 return -ENOMEM;
553         memset(ctx, 0, len);
554 
555         ctx->iv = sock_kmalloc(sk, ivlen, GFP_KERNEL);
556         if (!ctx->iv) {
557                 sock_kfree_s(sk, ctx, len);
558                 return -ENOMEM;
559         }
560         memset(ctx->iv, 0, ivlen);
561 
562         INIT_LIST_HEAD(&ctx->tsgl_list);
563         ctx->len = len;
564         ctx->used = 0;
565         atomic_set(&ctx->rcvused, 0);
566         ctx->more = 0;
567         ctx->merge = 0;
568         ctx->enc = 0;
569         ctx->aead_assoclen = 0;
570         crypto_init_wait(&ctx->wait);
571 
572         ask->private = ctx;
573 
574         sk->sk_destruct = aead_sock_destruct;
575 
576         return 0;
577 }
578 
579 static int aead_accept_parent(void *private, struct sock *sk)
580 {
581         struct aead_tfm *tfm = private;
582 
583         if (crypto_aead_get_flags(tfm->aead) & CRYPTO_TFM_NEED_KEY)
584                 return -ENOKEY;
585 
586         return aead_accept_parent_nokey(private, sk);
587 }
588 
589 static const struct af_alg_type algif_type_aead = {
590         .bind           =       aead_bind,
591         .release        =       aead_release,
592         .setkey         =       aead_setkey,
593         .setauthsize    =       aead_setauthsize,
594         .accept         =       aead_accept_parent,
595         .accept_nokey   =       aead_accept_parent_nokey,
596         .ops            =       &algif_aead_ops,
597         .ops_nokey      =       &algif_aead_ops_nokey,
598         .name           =       "aead",
599         .owner          =       THIS_MODULE
600 };
601 
602 static int __init algif_aead_init(void)
603 {
604         return af_alg_register_type(&algif_type_aead);
605 }
606 
607 static void __exit algif_aead_exit(void)
608 {
609         int err = af_alg_unregister_type(&algif_type_aead);
610         BUG_ON(err);
611 }
612 
613 module_init(algif_aead_init);
614 module_exit(algif_aead_exit);
615 MODULE_LICENSE("GPL");
616 MODULE_AUTHOR("Stephan Mueller <smueller@chronox.de>");
617 MODULE_DESCRIPTION("AEAD kernel crypto API user space interface");
618 

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