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4943ba16bb
This adds the module loading prefix "crypto-" to the template lookup as well. For example, attempting to load 'vfat(blowfish)' via AF_ALG now correctly includes the "crypto-" prefix at every level, correctly rejecting "vfat": net-pf-38 algif-hash crypto-vfat(blowfish) crypto-vfat(blowfish)-all crypto-vfat Reported-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
471 lines
12 KiB
C
471 lines
12 KiB
C
/*
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* CTR: Counter mode
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*
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* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/algapi.h>
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#include <crypto/ctr.h>
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#include <crypto/internal/skcipher.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/random.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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struct crypto_ctr_ctx {
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struct crypto_cipher *child;
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};
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struct crypto_rfc3686_ctx {
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struct crypto_ablkcipher *child;
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u8 nonce[CTR_RFC3686_NONCE_SIZE];
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};
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struct crypto_rfc3686_req_ctx {
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u8 iv[CTR_RFC3686_BLOCK_SIZE];
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struct ablkcipher_request subreq CRYPTO_MINALIGN_ATTR;
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};
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static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(parent);
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struct crypto_cipher *child = ctx->child;
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int err;
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crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_cipher_setkey(child, key, keylen);
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crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
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CRYPTO_TFM_RES_MASK);
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return err;
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}
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static void crypto_ctr_crypt_final(struct blkcipher_walk *walk,
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struct crypto_cipher *tfm)
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{
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unsigned int bsize = crypto_cipher_blocksize(tfm);
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unsigned long alignmask = crypto_cipher_alignmask(tfm);
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u8 *ctrblk = walk->iv;
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u8 tmp[bsize + alignmask];
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u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1);
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u8 *src = walk->src.virt.addr;
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u8 *dst = walk->dst.virt.addr;
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unsigned int nbytes = walk->nbytes;
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crypto_cipher_encrypt_one(tfm, keystream, ctrblk);
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crypto_xor(keystream, src, nbytes);
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memcpy(dst, keystream, nbytes);
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crypto_inc(ctrblk, bsize);
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}
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static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk,
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struct crypto_cipher *tfm)
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{
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
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crypto_cipher_alg(tfm)->cia_encrypt;
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unsigned int bsize = crypto_cipher_blocksize(tfm);
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u8 *ctrblk = walk->iv;
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u8 *src = walk->src.virt.addr;
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u8 *dst = walk->dst.virt.addr;
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unsigned int nbytes = walk->nbytes;
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do {
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/* create keystream */
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fn(crypto_cipher_tfm(tfm), dst, ctrblk);
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crypto_xor(dst, src, bsize);
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/* increment counter in counterblock */
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crypto_inc(ctrblk, bsize);
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src += bsize;
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dst += bsize;
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} while ((nbytes -= bsize) >= bsize);
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return nbytes;
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}
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static int crypto_ctr_crypt_inplace(struct blkcipher_walk *walk,
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struct crypto_cipher *tfm)
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{
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
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crypto_cipher_alg(tfm)->cia_encrypt;
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unsigned int bsize = crypto_cipher_blocksize(tfm);
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unsigned long alignmask = crypto_cipher_alignmask(tfm);
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unsigned int nbytes = walk->nbytes;
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u8 *ctrblk = walk->iv;
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u8 *src = walk->src.virt.addr;
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u8 tmp[bsize + alignmask];
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u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1);
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do {
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/* create keystream */
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fn(crypto_cipher_tfm(tfm), keystream, ctrblk);
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crypto_xor(src, keystream, bsize);
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/* increment counter in counterblock */
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crypto_inc(ctrblk, bsize);
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src += bsize;
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} while ((nbytes -= bsize) >= bsize);
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return nbytes;
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}
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static int crypto_ctr_crypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct blkcipher_walk walk;
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struct crypto_blkcipher *tfm = desc->tfm;
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struct crypto_ctr_ctx *ctx = crypto_blkcipher_ctx(tfm);
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struct crypto_cipher *child = ctx->child;
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unsigned int bsize = crypto_cipher_blocksize(child);
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt_block(desc, &walk, bsize);
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while (walk.nbytes >= bsize) {
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if (walk.src.virt.addr == walk.dst.virt.addr)
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nbytes = crypto_ctr_crypt_inplace(&walk, child);
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else
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nbytes = crypto_ctr_crypt_segment(&walk, child);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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if (walk.nbytes) {
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crypto_ctr_crypt_final(&walk, child);
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err = blkcipher_walk_done(desc, &walk, 0);
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}
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return err;
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}
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static int crypto_ctr_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = (void *)tfm->__crt_alg;
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struct crypto_spawn *spawn = crypto_instance_ctx(inst);
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struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_cipher *cipher;
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cipher = crypto_spawn_cipher(spawn);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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ctx->child = cipher;
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return 0;
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}
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static void crypto_ctr_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_cipher(ctx->child);
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}
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static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb)
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{
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struct crypto_instance *inst;
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struct crypto_alg *alg;
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int err;
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
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if (err)
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return ERR_PTR(err);
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alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_CIPHER,
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CRYPTO_ALG_TYPE_MASK);
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if (IS_ERR(alg))
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return ERR_CAST(alg);
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/* Block size must be >= 4 bytes. */
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err = -EINVAL;
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if (alg->cra_blocksize < 4)
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goto out_put_alg;
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/* If this is false we'd fail the alignment of crypto_inc. */
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if (alg->cra_blocksize % 4)
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goto out_put_alg;
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inst = crypto_alloc_instance("ctr", alg);
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if (IS_ERR(inst))
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goto out;
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inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
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inst->alg.cra_priority = alg->cra_priority;
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inst->alg.cra_blocksize = 1;
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inst->alg.cra_alignmask = alg->cra_alignmask | (__alignof__(u32) - 1);
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inst->alg.cra_type = &crypto_blkcipher_type;
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inst->alg.cra_blkcipher.ivsize = alg->cra_blocksize;
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inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
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inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
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inst->alg.cra_ctxsize = sizeof(struct crypto_ctr_ctx);
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inst->alg.cra_init = crypto_ctr_init_tfm;
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inst->alg.cra_exit = crypto_ctr_exit_tfm;
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inst->alg.cra_blkcipher.setkey = crypto_ctr_setkey;
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inst->alg.cra_blkcipher.encrypt = crypto_ctr_crypt;
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inst->alg.cra_blkcipher.decrypt = crypto_ctr_crypt;
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inst->alg.cra_blkcipher.geniv = "chainiv";
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out:
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crypto_mod_put(alg);
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return inst;
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out_put_alg:
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inst = ERR_PTR(err);
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goto out;
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}
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static void crypto_ctr_free(struct crypto_instance *inst)
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{
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crypto_drop_spawn(crypto_instance_ctx(inst));
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kfree(inst);
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}
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static struct crypto_template crypto_ctr_tmpl = {
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.name = "ctr",
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.alloc = crypto_ctr_alloc,
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.free = crypto_ctr_free,
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.module = THIS_MODULE,
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};
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static int crypto_rfc3686_setkey(struct crypto_ablkcipher *parent,
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const u8 *key, unsigned int keylen)
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{
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struct crypto_rfc3686_ctx *ctx = crypto_ablkcipher_ctx(parent);
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struct crypto_ablkcipher *child = ctx->child;
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int err;
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/* the nonce is stored in bytes at end of key */
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if (keylen < CTR_RFC3686_NONCE_SIZE)
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return -EINVAL;
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memcpy(ctx->nonce, key + (keylen - CTR_RFC3686_NONCE_SIZE),
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CTR_RFC3686_NONCE_SIZE);
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keylen -= CTR_RFC3686_NONCE_SIZE;
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crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_ablkcipher_setkey(child, key, keylen);
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crypto_ablkcipher_set_flags(parent, crypto_ablkcipher_get_flags(child) &
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CRYPTO_TFM_RES_MASK);
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return err;
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}
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static int crypto_rfc3686_crypt(struct ablkcipher_request *req)
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{
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struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
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struct crypto_rfc3686_ctx *ctx = crypto_ablkcipher_ctx(tfm);
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struct crypto_ablkcipher *child = ctx->child;
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unsigned long align = crypto_ablkcipher_alignmask(tfm);
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struct crypto_rfc3686_req_ctx *rctx =
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(void *)PTR_ALIGN((u8 *)ablkcipher_request_ctx(req), align + 1);
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struct ablkcipher_request *subreq = &rctx->subreq;
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u8 *iv = rctx->iv;
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/* set up counter block */
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memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE);
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memcpy(iv + CTR_RFC3686_NONCE_SIZE, req->info, CTR_RFC3686_IV_SIZE);
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/* initialize counter portion of counter block */
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*(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) =
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cpu_to_be32(1);
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ablkcipher_request_set_tfm(subreq, child);
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ablkcipher_request_set_callback(subreq, req->base.flags,
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req->base.complete, req->base.data);
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ablkcipher_request_set_crypt(subreq, req->src, req->dst, req->nbytes,
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iv);
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return crypto_ablkcipher_encrypt(subreq);
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}
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static int crypto_rfc3686_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = (void *)tfm->__crt_alg;
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struct crypto_skcipher_spawn *spawn = crypto_instance_ctx(inst);
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struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_ablkcipher *cipher;
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unsigned long align;
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cipher = crypto_spawn_skcipher(spawn);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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ctx->child = cipher;
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align = crypto_tfm_alg_alignmask(tfm);
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align &= ~(crypto_tfm_ctx_alignment() - 1);
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tfm->crt_ablkcipher.reqsize = align +
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sizeof(struct crypto_rfc3686_req_ctx) +
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crypto_ablkcipher_reqsize(cipher);
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return 0;
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}
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static void crypto_rfc3686_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_ablkcipher(ctx->child);
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}
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static struct crypto_instance *crypto_rfc3686_alloc(struct rtattr **tb)
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{
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struct crypto_attr_type *algt;
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struct crypto_instance *inst;
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struct crypto_alg *alg;
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struct crypto_skcipher_spawn *spawn;
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const char *cipher_name;
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int err;
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algt = crypto_get_attr_type(tb);
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if (IS_ERR(algt))
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return ERR_CAST(algt);
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if ((algt->type ^ CRYPTO_ALG_TYPE_BLKCIPHER) & algt->mask)
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return ERR_PTR(-EINVAL);
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cipher_name = crypto_attr_alg_name(tb[1]);
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if (IS_ERR(cipher_name))
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return ERR_CAST(cipher_name);
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inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
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if (!inst)
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return ERR_PTR(-ENOMEM);
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spawn = crypto_instance_ctx(inst);
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crypto_set_skcipher_spawn(spawn, inst);
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err = crypto_grab_skcipher(spawn, cipher_name, 0,
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crypto_requires_sync(algt->type,
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algt->mask));
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if (err)
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goto err_free_inst;
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alg = crypto_skcipher_spawn_alg(spawn);
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/* We only support 16-byte blocks. */
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err = -EINVAL;
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if (alg->cra_ablkcipher.ivsize != CTR_RFC3686_BLOCK_SIZE)
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goto err_drop_spawn;
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/* Not a stream cipher? */
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if (alg->cra_blocksize != 1)
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goto err_drop_spawn;
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err = -ENAMETOOLONG;
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if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "rfc3686(%s)",
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alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
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goto err_drop_spawn;
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if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
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"rfc3686(%s)", alg->cra_driver_name) >=
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CRYPTO_MAX_ALG_NAME)
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goto err_drop_spawn;
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inst->alg.cra_priority = alg->cra_priority;
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inst->alg.cra_blocksize = 1;
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inst->alg.cra_alignmask = alg->cra_alignmask;
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inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
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(alg->cra_flags & CRYPTO_ALG_ASYNC);
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inst->alg.cra_type = &crypto_ablkcipher_type;
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inst->alg.cra_ablkcipher.ivsize = CTR_RFC3686_IV_SIZE;
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inst->alg.cra_ablkcipher.min_keysize =
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alg->cra_ablkcipher.min_keysize + CTR_RFC3686_NONCE_SIZE;
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inst->alg.cra_ablkcipher.max_keysize =
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alg->cra_ablkcipher.max_keysize + CTR_RFC3686_NONCE_SIZE;
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inst->alg.cra_ablkcipher.geniv = "seqiv";
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inst->alg.cra_ablkcipher.setkey = crypto_rfc3686_setkey;
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inst->alg.cra_ablkcipher.encrypt = crypto_rfc3686_crypt;
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inst->alg.cra_ablkcipher.decrypt = crypto_rfc3686_crypt;
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inst->alg.cra_ctxsize = sizeof(struct crypto_rfc3686_ctx);
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inst->alg.cra_init = crypto_rfc3686_init_tfm;
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inst->alg.cra_exit = crypto_rfc3686_exit_tfm;
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return inst;
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err_drop_spawn:
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crypto_drop_skcipher(spawn);
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err_free_inst:
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kfree(inst);
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return ERR_PTR(err);
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}
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static void crypto_rfc3686_free(struct crypto_instance *inst)
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{
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struct crypto_skcipher_spawn *spawn = crypto_instance_ctx(inst);
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crypto_drop_skcipher(spawn);
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kfree(inst);
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}
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static struct crypto_template crypto_rfc3686_tmpl = {
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.name = "rfc3686",
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.alloc = crypto_rfc3686_alloc,
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.free = crypto_rfc3686_free,
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.module = THIS_MODULE,
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};
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static int __init crypto_ctr_module_init(void)
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{
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int err;
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err = crypto_register_template(&crypto_ctr_tmpl);
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if (err)
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goto out;
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err = crypto_register_template(&crypto_rfc3686_tmpl);
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if (err)
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goto out_drop_ctr;
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out:
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return err;
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out_drop_ctr:
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crypto_unregister_template(&crypto_ctr_tmpl);
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goto out;
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}
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static void __exit crypto_ctr_module_exit(void)
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{
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crypto_unregister_template(&crypto_rfc3686_tmpl);
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crypto_unregister_template(&crypto_ctr_tmpl);
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}
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module_init(crypto_ctr_module_init);
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module_exit(crypto_ctr_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("CTR Counter block mode");
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MODULE_ALIAS_CRYPTO("rfc3686");
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MODULE_ALIAS_CRYPTO("ctr");
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