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1 /*
2 * authencesn.c - AEAD wrapper for IPsec with extended sequence numbers,
3 * derived from authenc.c
4 *
5 * Copyright (C) 2010 secunet Security Networks AG
6 * Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
7 * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 */
15
16 #include <crypto/internal/aead.h>
17 #include <crypto/internal/hash.h>
18 #include <crypto/internal/skcipher.h>
19 #include <crypto/authenc.h>
20 #include <crypto/null.h>
21 #include <crypto/scatterwalk.h>
22 #include <linux/err.h>
23 #include <linux/init.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/rtnetlink.h>
27 #include <linux/slab.h>
28 #include <linux/spinlock.h>
29
30 struct authenc_esn_instance_ctx {
31 struct crypto_ahash_spawn auth;
32 struct crypto_skcipher_spawn enc;
33 };
34
35 struct crypto_authenc_esn_ctx {
36 unsigned int reqoff;
37 struct crypto_ahash *auth;
38 struct crypto_skcipher *enc;
39 struct crypto_skcipher *null;
40 };
41
42 struct authenc_esn_request_ctx {
43 struct scatterlist src[2];
44 struct scatterlist dst[2];
45 char tail[];
46 };
47
48 static void authenc_esn_request_complete(struct aead_request *req, int err)
49 {
50 if (err != -EINPROGRESS)
51 aead_request_complete(req, err);
52 }
53
54 static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn,
55 unsigned int authsize)
56 {
57 if (authsize > 0 && authsize < 4)
58 return -EINVAL;
59
60 return 0;
61 }
62
63 static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key,
64 unsigned int keylen)
65 {
66 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
67 struct crypto_ahash *auth = ctx->auth;
68 struct crypto_skcipher *enc = ctx->enc;
69 struct crypto_authenc_keys keys;
70 int err = -EINVAL;
71
72 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
73 goto badkey;
74
75 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
76 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
77 CRYPTO_TFM_REQ_MASK);
78 err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
79 crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) &
80 CRYPTO_TFM_RES_MASK);
81
82 if (err)
83 goto out;
84
85 crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
86 crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
87 CRYPTO_TFM_REQ_MASK);
88 err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
89 crypto_aead_set_flags(authenc_esn, crypto_skcipher_get_flags(enc) &
90 CRYPTO_TFM_RES_MASK);
91
92 out:
93 return err;
94
95 badkey:
96 crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
97 goto out;
98 }
99
100 static int crypto_authenc_esn_genicv_tail(struct aead_request *req,
101 unsigned int flags)
102 {
103 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
104 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
105 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
106 struct crypto_ahash *auth = ctx->auth;
107 u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
108 crypto_ahash_alignmask(auth) + 1);
109 unsigned int authsize = crypto_aead_authsize(authenc_esn);
110 unsigned int assoclen = req->assoclen;
111 unsigned int cryptlen = req->cryptlen;
112 struct scatterlist *dst = req->dst;
113 u32 tmp[2];
114
115 /* Move high-order bits of sequence number back. */
116 scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
117 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
118 scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
119
120 scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1);
121 return 0;
122 }
123
124 static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq,
125 int err)
126 {
127 struct aead_request *req = areq->data;
128
129 err = err ?: crypto_authenc_esn_genicv_tail(req, 0);
130 aead_request_complete(req, err);
131 }
132
133 static int crypto_authenc_esn_genicv(struct aead_request *req,
134 unsigned int flags)
135 {
136 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
137 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
138 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
139 struct crypto_ahash *auth = ctx->auth;
140 u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
141 crypto_ahash_alignmask(auth) + 1);
142 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
143 unsigned int authsize = crypto_aead_authsize(authenc_esn);
144 unsigned int assoclen = req->assoclen;
145 unsigned int cryptlen = req->cryptlen;
146 struct scatterlist *dst = req->dst;
147 u32 tmp[2];
148
149 if (!authsize)
150 return 0;
151
152 /* Move high-order bits of sequence number to the end. */
153 scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
154 scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
155 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
156
157 sg_init_table(areq_ctx->dst, 2);
158 dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
159
160 ahash_request_set_tfm(ahreq, auth);
161 ahash_request_set_crypt(ahreq, dst, hash, assoclen + cryptlen);
162 ahash_request_set_callback(ahreq, flags,
163 authenc_esn_geniv_ahash_done, req);
164
165 return crypto_ahash_digest(ahreq) ?:
166 crypto_authenc_esn_genicv_tail(req, aead_request_flags(req));
167 }
168
169
170 static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req,
171 int err)
172 {
173 struct aead_request *areq = req->data;
174
175 if (!err)
176 err = crypto_authenc_esn_genicv(areq, 0);
177
178 authenc_esn_request_complete(areq, err);
179 }
180
181 static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len)
182 {
183 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
184 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
185 SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
186
187 skcipher_request_set_tfm(skreq, ctx->null);
188 skcipher_request_set_callback(skreq, aead_request_flags(req),
189 NULL, NULL);
190 skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL);
191
192 return crypto_skcipher_encrypt(skreq);
193 }
194
195 static int crypto_authenc_esn_encrypt(struct aead_request *req)
196 {
197 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
198 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
199 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
200 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
201 ctx->reqoff);
202 struct crypto_skcipher *enc = ctx->enc;
203 unsigned int assoclen = req->assoclen;
204 unsigned int cryptlen = req->cryptlen;
205 struct scatterlist *src, *dst;
206 int err;
207
208 sg_init_table(areq_ctx->src, 2);
209 src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen);
210 dst = src;
211
212 if (req->src != req->dst) {
213 err = crypto_authenc_esn_copy(req, assoclen);
214 if (err)
215 return err;
216
217 sg_init_table(areq_ctx->dst, 2);
218 dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen);
219 }
220
221 skcipher_request_set_tfm(skreq, enc);
222 skcipher_request_set_callback(skreq, aead_request_flags(req),
223 crypto_authenc_esn_encrypt_done, req);
224 skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
225
226 err = crypto_skcipher_encrypt(skreq);
227 if (err)
228 return err;
229
230 return crypto_authenc_esn_genicv(req, aead_request_flags(req));
231 }
232
233 static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
234 unsigned int flags)
235 {
236 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
237 unsigned int authsize = crypto_aead_authsize(authenc_esn);
238 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
239 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
240 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
241 ctx->reqoff);
242 struct crypto_ahash *auth = ctx->auth;
243 u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
244 crypto_ahash_alignmask(auth) + 1);
245 unsigned int cryptlen = req->cryptlen - authsize;
246 unsigned int assoclen = req->assoclen;
247 struct scatterlist *dst = req->dst;
248 u8 *ihash = ohash + crypto_ahash_digestsize(auth);
249 u32 tmp[2];
250
251 /* Move high-order bits of sequence number back. */
252 scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
253 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
254 scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
255
256 if (crypto_memneq(ihash, ohash, authsize))
257 return -EBADMSG;
258
259 sg_init_table(areq_ctx->dst, 2);
260 dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen);
261
262 skcipher_request_set_tfm(skreq, ctx->enc);
263 skcipher_request_set_callback(skreq, flags,
264 req->base.complete, req->base.data);
265 skcipher_request_set_crypt(skreq, dst, dst, cryptlen, req->iv);
266
267 return crypto_skcipher_decrypt(skreq);
268 }
269
270 static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq,
271 int err)
272 {
273 struct aead_request *req = areq->data;
274
275 err = err ?: crypto_authenc_esn_decrypt_tail(req, 0);
276 aead_request_complete(req, err);
277 }
278
279 static int crypto_authenc_esn_decrypt(struct aead_request *req)
280 {
281 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
282 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
283 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
284 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
285 unsigned int authsize = crypto_aead_authsize(authenc_esn);
286 struct crypto_ahash *auth = ctx->auth;
287 u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
288 crypto_ahash_alignmask(auth) + 1);
289 unsigned int assoclen = req->assoclen;
290 unsigned int cryptlen = req->cryptlen;
291 u8 *ihash = ohash + crypto_ahash_digestsize(auth);
292 struct scatterlist *dst = req->dst;
293 u32 tmp[2];
294 int err;
295
296 cryptlen -= authsize;
297
298 if (req->src != dst) {
299 err = crypto_authenc_esn_copy(req, assoclen + cryptlen);
300 if (err)
301 return err;
302 }
303
304 scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen,
305 authsize, 0);
306
307 if (!authsize)
308 goto tail;
309
310 /* Move high-order bits of sequence number to the end. */
311 scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
312 scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
313 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
314
315 sg_init_table(areq_ctx->dst, 2);
316 dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
317
318 ahash_request_set_tfm(ahreq, auth);
319 ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen);
320 ahash_request_set_callback(ahreq, aead_request_flags(req),
321 authenc_esn_verify_ahash_done, req);
322
323 err = crypto_ahash_digest(ahreq);
324 if (err)
325 return err;
326
327 tail:
328 return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req));
329 }
330
331 static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm)
332 {
333 struct aead_instance *inst = aead_alg_instance(tfm);
334 struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst);
335 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
336 struct crypto_ahash *auth;
337 struct crypto_skcipher *enc;
338 struct crypto_skcipher *null;
339 int err;
340
341 auth = crypto_spawn_ahash(&ictx->auth);
342 if (IS_ERR(auth))
343 return PTR_ERR(auth);
344
345 enc = crypto_spawn_skcipher(&ictx->enc);
346 err = PTR_ERR(enc);
347 if (IS_ERR(enc))
348 goto err_free_ahash;
349
350 null = crypto_get_default_null_skcipher2();
351 err = PTR_ERR(null);
352 if (IS_ERR(null))
353 goto err_free_skcipher;
354
355 ctx->auth = auth;
356 ctx->enc = enc;
357 ctx->null = null;
358
359 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth),
360 crypto_ahash_alignmask(auth) + 1);
361
362 crypto_aead_set_reqsize(
363 tfm,
364 sizeof(struct authenc_esn_request_ctx) +
365 ctx->reqoff +
366 max_t(unsigned int,
367 crypto_ahash_reqsize(auth) +
368 sizeof(struct ahash_request),
369 sizeof(struct skcipher_request) +
370 crypto_skcipher_reqsize(enc)));
371
372 return 0;
373
374 err_free_skcipher:
375 crypto_free_skcipher(enc);
376 err_free_ahash:
377 crypto_free_ahash(auth);
378 return err;
379 }
380
381 static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm)
382 {
383 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
384
385 crypto_free_ahash(ctx->auth);
386 crypto_free_skcipher(ctx->enc);
387 crypto_put_default_null_skcipher2();
388 }
389
390 static void crypto_authenc_esn_free(struct aead_instance *inst)
391 {
392 struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst);
393
394 crypto_drop_skcipher(&ctx->enc);
395 crypto_drop_ahash(&ctx->auth);
396 kfree(inst);
397 }
398
399 static int crypto_authenc_esn_create(struct crypto_template *tmpl,
400 struct rtattr **tb)
401 {
402 struct crypto_attr_type *algt;
403 struct aead_instance *inst;
404 struct hash_alg_common *auth;
405 struct crypto_alg *auth_base;
406 struct skcipher_alg *enc;
407 struct authenc_esn_instance_ctx *ctx;
408 const char *enc_name;
409 int err;
410
411 algt = crypto_get_attr_type(tb);
412 if (IS_ERR(algt))
413 return PTR_ERR(algt);
414
415 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
416 return -EINVAL;
417
418 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
419 CRYPTO_ALG_TYPE_AHASH_MASK |
420 crypto_requires_sync(algt->type, algt->mask));
421 if (IS_ERR(auth))
422 return PTR_ERR(auth);
423
424 auth_base = &auth->base;
425
426 enc_name = crypto_attr_alg_name(tb[2]);
427 err = PTR_ERR(enc_name);
428 if (IS_ERR(enc_name))
429 goto out_put_auth;
430
431 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
432 err = -ENOMEM;
433 if (!inst)
434 goto out_put_auth;
435
436 ctx = aead_instance_ctx(inst);
437
438 err = crypto_init_ahash_spawn(&ctx->auth, auth,
439 aead_crypto_instance(inst));
440 if (err)
441 goto err_free_inst;
442
443 crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));
444 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
445 crypto_requires_sync(algt->type,
446 algt->mask));
447 if (err)
448 goto err_drop_auth;
449
450 enc = crypto_spawn_skcipher_alg(&ctx->enc);
451
452 err = -ENAMETOOLONG;
453 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
454 "authencesn(%s,%s)", auth_base->cra_name,
455 enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
456 goto err_drop_enc;
457
458 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
459 "authencesn(%s,%s)", auth_base->cra_driver_name,
460 enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
461 goto err_drop_enc;
462
463 inst->alg.base.cra_flags = (auth_base->cra_flags |
464 enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
465 inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
466 auth_base->cra_priority;
467 inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
468 inst->alg.base.cra_alignmask = auth_base->cra_alignmask |
469 enc->base.cra_alignmask;
470 inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
471
472 inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
473 inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
474 inst->alg.maxauthsize = auth->digestsize;
475
476 inst->alg.init = crypto_authenc_esn_init_tfm;
477 inst->alg.exit = crypto_authenc_esn_exit_tfm;
478
479 inst->alg.setkey = crypto_authenc_esn_setkey;
480 inst->alg.setauthsize = crypto_authenc_esn_setauthsize;
481 inst->alg.encrypt = crypto_authenc_esn_encrypt;
482 inst->alg.decrypt = crypto_authenc_esn_decrypt;
483
484 inst->free = crypto_authenc_esn_free,
485
486 err = aead_register_instance(tmpl, inst);
487 if (err)
488 goto err_drop_enc;
489
490 out:
491 crypto_mod_put(auth_base);
492 return err;
493
494 err_drop_enc:
495 crypto_drop_skcipher(&ctx->enc);
496 err_drop_auth:
497 crypto_drop_ahash(&ctx->auth);
498 err_free_inst:
499 kfree(inst);
500 out_put_auth:
501 goto out;
502 }
503
504 static struct crypto_template crypto_authenc_esn_tmpl = {
505 .name = "authencesn",
506 .create = crypto_authenc_esn_create,
507 .module = THIS_MODULE,
508 };
509
510 static int __init crypto_authenc_esn_module_init(void)
511 {
512 return crypto_register_template(&crypto_authenc_esn_tmpl);
513 }
514
515 static void __exit crypto_authenc_esn_module_exit(void)
516 {
517 crypto_unregister_template(&crypto_authenc_esn_tmpl);
518 }
519
520 module_init(crypto_authenc_esn_module_init);
521 module_exit(crypto_authenc_esn_module_exit);
522
523 MODULE_LICENSE("GPL");
524 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
525 MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
526 MODULE_ALIAS_CRYPTO("authencesn");