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![Eric Biggers](/assets/img/avatar_default.png)
The flag CRYPTO_ALG_ASYNC is "inherited" in the sense that when a template is instantiated, the template will have CRYPTO_ALG_ASYNC set if any of the algorithms it uses has CRYPTO_ALG_ASYNC set. We'd like to add a second flag (CRYPTO_ALG_ALLOCATES_MEMORY) that gets "inherited" in the same way. This is difficult because the handling of CRYPTO_ALG_ASYNC is hardcoded everywhere. Address this by: - Add CRYPTO_ALG_INHERITED_FLAGS, which contains the set of flags that have these inheritance semantics. - Add crypto_algt_inherited_mask(), for use by template ->create() methods. It returns any of these flags that the user asked to be unset and thus must be passed in the 'mask' to crypto_grab_*(). - Also modify crypto_check_attr_type() to handle computing the 'mask' so that most templates can just use this. - Make crypto_grab_*() propagate these flags to the template instance being created so that templates don't have to do this themselves. Make crypto/simd.c propagate these flags too, since it "wraps" another algorithm, similar to a template. Based on a patch by Mikulas Patocka <mpatocka@redhat.com> (https://lore.kernel.org/r/alpine.LRH.2.02.2006301414580.30526@file01.intranet.prod.int.rdu2.redhat.com). Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
485 lines
14 KiB
C
485 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* authencesn.c - AEAD wrapper for IPsec with extended sequence numbers,
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* derived from authenc.c
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*
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* Copyright (C) 2010 secunet Security Networks AG
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* Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
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* Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <crypto/internal/aead.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/authenc.h>
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#include <crypto/null.h>
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#include <crypto/scatterwalk.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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struct authenc_esn_instance_ctx {
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struct crypto_ahash_spawn auth;
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struct crypto_skcipher_spawn enc;
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};
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struct crypto_authenc_esn_ctx {
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unsigned int reqoff;
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struct crypto_ahash *auth;
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struct crypto_skcipher *enc;
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struct crypto_sync_skcipher *null;
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};
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struct authenc_esn_request_ctx {
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struct scatterlist src[2];
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struct scatterlist dst[2];
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char tail[];
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};
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static void authenc_esn_request_complete(struct aead_request *req, int err)
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{
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if (err != -EINPROGRESS)
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aead_request_complete(req, err);
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}
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static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn,
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unsigned int authsize)
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{
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if (authsize > 0 && authsize < 4)
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return -EINVAL;
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return 0;
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}
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static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct crypto_ahash *auth = ctx->auth;
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struct crypto_skcipher *enc = ctx->enc;
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struct crypto_authenc_keys keys;
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int err = -EINVAL;
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if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
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goto out;
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crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
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crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
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if (err)
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goto out;
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crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
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crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
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out:
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memzero_explicit(&keys, sizeof(keys));
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return err;
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}
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static int crypto_authenc_esn_genicv_tail(struct aead_request *req,
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unsigned int flags)
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{
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct crypto_ahash *auth = ctx->auth;
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u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
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crypto_ahash_alignmask(auth) + 1);
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unsigned int authsize = crypto_aead_authsize(authenc_esn);
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unsigned int assoclen = req->assoclen;
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unsigned int cryptlen = req->cryptlen;
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struct scatterlist *dst = req->dst;
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u32 tmp[2];
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/* Move high-order bits of sequence number back. */
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scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
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scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
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scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
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scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1);
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return 0;
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}
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static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq,
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int err)
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{
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struct aead_request *req = areq->data;
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err = err ?: crypto_authenc_esn_genicv_tail(req, 0);
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aead_request_complete(req, err);
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}
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static int crypto_authenc_esn_genicv(struct aead_request *req,
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unsigned int flags)
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{
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct crypto_ahash *auth = ctx->auth;
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u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
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crypto_ahash_alignmask(auth) + 1);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
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unsigned int authsize = crypto_aead_authsize(authenc_esn);
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unsigned int assoclen = req->assoclen;
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unsigned int cryptlen = req->cryptlen;
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struct scatterlist *dst = req->dst;
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u32 tmp[2];
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if (!authsize)
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return 0;
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/* Move high-order bits of sequence number to the end. */
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scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
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scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
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scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
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sg_init_table(areq_ctx->dst, 2);
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dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
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ahash_request_set_tfm(ahreq, auth);
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ahash_request_set_crypt(ahreq, dst, hash, assoclen + cryptlen);
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ahash_request_set_callback(ahreq, flags,
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authenc_esn_geniv_ahash_done, req);
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return crypto_ahash_digest(ahreq) ?:
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crypto_authenc_esn_genicv_tail(req, aead_request_flags(req));
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}
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static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req,
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int err)
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{
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struct aead_request *areq = req->data;
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if (!err)
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err = crypto_authenc_esn_genicv(areq, 0);
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authenc_esn_request_complete(areq, err);
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}
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static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len)
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{
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
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skcipher_request_set_sync_tfm(skreq, ctx->null);
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skcipher_request_set_callback(skreq, aead_request_flags(req),
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NULL, NULL);
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skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL);
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return crypto_skcipher_encrypt(skreq);
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}
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static int crypto_authenc_esn_encrypt(struct aead_request *req)
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{
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct skcipher_request *skreq = (void *)(areq_ctx->tail +
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ctx->reqoff);
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struct crypto_skcipher *enc = ctx->enc;
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unsigned int assoclen = req->assoclen;
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unsigned int cryptlen = req->cryptlen;
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struct scatterlist *src, *dst;
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int err;
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sg_init_table(areq_ctx->src, 2);
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src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen);
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dst = src;
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if (req->src != req->dst) {
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err = crypto_authenc_esn_copy(req, assoclen);
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if (err)
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return err;
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sg_init_table(areq_ctx->dst, 2);
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dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen);
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}
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skcipher_request_set_tfm(skreq, enc);
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skcipher_request_set_callback(skreq, aead_request_flags(req),
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crypto_authenc_esn_encrypt_done, req);
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skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
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err = crypto_skcipher_encrypt(skreq);
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if (err)
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return err;
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return crypto_authenc_esn_genicv(req, aead_request_flags(req));
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}
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static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
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unsigned int flags)
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{
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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unsigned int authsize = crypto_aead_authsize(authenc_esn);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct skcipher_request *skreq = (void *)(areq_ctx->tail +
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ctx->reqoff);
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struct crypto_ahash *auth = ctx->auth;
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u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
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crypto_ahash_alignmask(auth) + 1);
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unsigned int cryptlen = req->cryptlen - authsize;
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unsigned int assoclen = req->assoclen;
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struct scatterlist *dst = req->dst;
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u8 *ihash = ohash + crypto_ahash_digestsize(auth);
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u32 tmp[2];
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if (!authsize)
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goto decrypt;
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/* Move high-order bits of sequence number back. */
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scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
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scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
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scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
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if (crypto_memneq(ihash, ohash, authsize))
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return -EBADMSG;
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decrypt:
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sg_init_table(areq_ctx->dst, 2);
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dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen);
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skcipher_request_set_tfm(skreq, ctx->enc);
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skcipher_request_set_callback(skreq, flags,
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req->base.complete, req->base.data);
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skcipher_request_set_crypt(skreq, dst, dst, cryptlen, req->iv);
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return crypto_skcipher_decrypt(skreq);
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}
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static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq,
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int err)
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{
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struct aead_request *req = areq->data;
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err = err ?: crypto_authenc_esn_decrypt_tail(req, 0);
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authenc_esn_request_complete(req, err);
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}
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static int crypto_authenc_esn_decrypt(struct aead_request *req)
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{
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
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unsigned int authsize = crypto_aead_authsize(authenc_esn);
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struct crypto_ahash *auth = ctx->auth;
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u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
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crypto_ahash_alignmask(auth) + 1);
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unsigned int assoclen = req->assoclen;
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unsigned int cryptlen = req->cryptlen;
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u8 *ihash = ohash + crypto_ahash_digestsize(auth);
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struct scatterlist *dst = req->dst;
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u32 tmp[2];
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int err;
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cryptlen -= authsize;
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if (req->src != dst) {
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err = crypto_authenc_esn_copy(req, assoclen + cryptlen);
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if (err)
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return err;
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}
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scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen,
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authsize, 0);
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if (!authsize)
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goto tail;
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/* Move high-order bits of sequence number to the end. */
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scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
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scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
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scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
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sg_init_table(areq_ctx->dst, 2);
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dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
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ahash_request_set_tfm(ahreq, auth);
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ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen);
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ahash_request_set_callback(ahreq, aead_request_flags(req),
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authenc_esn_verify_ahash_done, req);
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err = crypto_ahash_digest(ahreq);
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if (err)
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return err;
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tail:
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return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req));
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}
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static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm)
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{
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struct aead_instance *inst = aead_alg_instance(tfm);
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struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst);
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
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struct crypto_ahash *auth;
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struct crypto_skcipher *enc;
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struct crypto_sync_skcipher *null;
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int err;
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auth = crypto_spawn_ahash(&ictx->auth);
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if (IS_ERR(auth))
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return PTR_ERR(auth);
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enc = crypto_spawn_skcipher(&ictx->enc);
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err = PTR_ERR(enc);
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if (IS_ERR(enc))
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goto err_free_ahash;
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null = crypto_get_default_null_skcipher();
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err = PTR_ERR(null);
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if (IS_ERR(null))
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goto err_free_skcipher;
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ctx->auth = auth;
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ctx->enc = enc;
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ctx->null = null;
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ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth),
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crypto_ahash_alignmask(auth) + 1);
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crypto_aead_set_reqsize(
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tfm,
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sizeof(struct authenc_esn_request_ctx) +
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ctx->reqoff +
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max_t(unsigned int,
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crypto_ahash_reqsize(auth) +
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sizeof(struct ahash_request),
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sizeof(struct skcipher_request) +
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crypto_skcipher_reqsize(enc)));
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return 0;
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err_free_skcipher:
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crypto_free_skcipher(enc);
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err_free_ahash:
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crypto_free_ahash(auth);
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return err;
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}
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static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm)
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{
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
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crypto_free_ahash(ctx->auth);
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crypto_free_skcipher(ctx->enc);
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crypto_put_default_null_skcipher();
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}
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static void crypto_authenc_esn_free(struct aead_instance *inst)
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{
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struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst);
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crypto_drop_skcipher(&ctx->enc);
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crypto_drop_ahash(&ctx->auth);
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kfree(inst);
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}
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static int crypto_authenc_esn_create(struct crypto_template *tmpl,
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struct rtattr **tb)
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{
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u32 mask;
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struct aead_instance *inst;
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struct authenc_esn_instance_ctx *ctx;
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struct hash_alg_common *auth;
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struct crypto_alg *auth_base;
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struct skcipher_alg *enc;
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int err;
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
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if (err)
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return err;
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inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
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if (!inst)
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return -ENOMEM;
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ctx = aead_instance_ctx(inst);
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err = crypto_grab_ahash(&ctx->auth, aead_crypto_instance(inst),
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crypto_attr_alg_name(tb[1]), 0, mask);
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if (err)
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goto err_free_inst;
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auth = crypto_spawn_ahash_alg(&ctx->auth);
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auth_base = &auth->base;
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err = crypto_grab_skcipher(&ctx->enc, aead_crypto_instance(inst),
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crypto_attr_alg_name(tb[2]), 0, mask);
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if (err)
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goto err_free_inst;
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enc = crypto_spawn_skcipher_alg(&ctx->enc);
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err = -ENAMETOOLONG;
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if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
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"authencesn(%s,%s)", auth_base->cra_name,
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enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
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goto err_free_inst;
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if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
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"authencesn(%s,%s)", auth_base->cra_driver_name,
|
|
enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
|
|
auth_base->cra_priority;
|
|
inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
|
|
inst->alg.base.cra_alignmask = auth_base->cra_alignmask |
|
|
enc->base.cra_alignmask;
|
|
inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
|
|
|
|
inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
|
|
inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
|
|
inst->alg.maxauthsize = auth->digestsize;
|
|
|
|
inst->alg.init = crypto_authenc_esn_init_tfm;
|
|
inst->alg.exit = crypto_authenc_esn_exit_tfm;
|
|
|
|
inst->alg.setkey = crypto_authenc_esn_setkey;
|
|
inst->alg.setauthsize = crypto_authenc_esn_setauthsize;
|
|
inst->alg.encrypt = crypto_authenc_esn_encrypt;
|
|
inst->alg.decrypt = crypto_authenc_esn_decrypt;
|
|
|
|
inst->free = crypto_authenc_esn_free;
|
|
|
|
err = aead_register_instance(tmpl, inst);
|
|
if (err) {
|
|
err_free_inst:
|
|
crypto_authenc_esn_free(inst);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static struct crypto_template crypto_authenc_esn_tmpl = {
|
|
.name = "authencesn",
|
|
.create = crypto_authenc_esn_create,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
static int __init crypto_authenc_esn_module_init(void)
|
|
{
|
|
return crypto_register_template(&crypto_authenc_esn_tmpl);
|
|
}
|
|
|
|
static void __exit crypto_authenc_esn_module_exit(void)
|
|
{
|
|
crypto_unregister_template(&crypto_authenc_esn_tmpl);
|
|
}
|
|
|
|
subsys_initcall(crypto_authenc_esn_module_init);
|
|
module_exit(crypto_authenc_esn_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
|
|
MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
|
|
MODULE_ALIAS_CRYPTO("authencesn");
|