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![Herbert Xu](/assets/img/avatar_default.png)
This patch replaces the custom crypto completion function with crypto_req_done. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
313 lines
6.3 KiB
C
313 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Crypto operations using stored keys
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*
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* Copyright (c) 2016, Intel Corporation
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*/
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/scatterlist.h>
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#include <linux/crypto.h>
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#include <crypto/hash.h>
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#include <crypto/kpp.h>
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#include <crypto/dh.h>
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#include <crypto/kdf_sp800108.h>
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#include <keys/user-type.h>
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#include "internal.h"
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static ssize_t dh_data_from_key(key_serial_t keyid, const void **data)
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{
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struct key *key;
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key_ref_t key_ref;
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long status;
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ssize_t ret;
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key_ref = lookup_user_key(keyid, 0, KEY_NEED_READ);
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if (IS_ERR(key_ref)) {
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ret = -ENOKEY;
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goto error;
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}
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key = key_ref_to_ptr(key_ref);
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ret = -EOPNOTSUPP;
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if (key->type == &key_type_user) {
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down_read(&key->sem);
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status = key_validate(key);
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if (status == 0) {
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const struct user_key_payload *payload;
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uint8_t *duplicate;
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payload = user_key_payload_locked(key);
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duplicate = kmemdup(payload->data, payload->datalen,
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GFP_KERNEL);
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if (duplicate) {
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*data = duplicate;
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ret = payload->datalen;
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} else {
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ret = -ENOMEM;
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}
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}
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up_read(&key->sem);
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}
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key_put(key);
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error:
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return ret;
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}
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static void dh_free_data(struct dh *dh)
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{
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kfree_sensitive(dh->key);
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kfree_sensitive(dh->p);
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kfree_sensitive(dh->g);
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}
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static int kdf_alloc(struct crypto_shash **hash, char *hashname)
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{
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struct crypto_shash *tfm;
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/* allocate synchronous hash */
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tfm = crypto_alloc_shash(hashname, 0, 0);
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if (IS_ERR(tfm)) {
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pr_info("could not allocate digest TFM handle %s\n", hashname);
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return PTR_ERR(tfm);
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}
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if (crypto_shash_digestsize(tfm) == 0) {
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crypto_free_shash(tfm);
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return -EINVAL;
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}
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*hash = tfm;
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return 0;
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}
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static void kdf_dealloc(struct crypto_shash *hash)
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{
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if (hash)
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crypto_free_shash(hash);
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}
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static int keyctl_dh_compute_kdf(struct crypto_shash *hash,
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char __user *buffer, size_t buflen,
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uint8_t *kbuf, size_t kbuflen)
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{
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struct kvec kbuf_iov = { .iov_base = kbuf, .iov_len = kbuflen };
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uint8_t *outbuf = NULL;
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int ret;
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size_t outbuf_len = roundup(buflen, crypto_shash_digestsize(hash));
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outbuf = kmalloc(outbuf_len, GFP_KERNEL);
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if (!outbuf) {
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ret = -ENOMEM;
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goto err;
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}
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ret = crypto_kdf108_ctr_generate(hash, &kbuf_iov, 1, outbuf, outbuf_len);
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if (ret)
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goto err;
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ret = buflen;
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if (copy_to_user(buffer, outbuf, buflen) != 0)
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ret = -EFAULT;
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err:
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kfree_sensitive(outbuf);
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return ret;
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}
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long __keyctl_dh_compute(struct keyctl_dh_params __user *params,
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char __user *buffer, size_t buflen,
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struct keyctl_kdf_params *kdfcopy)
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{
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long ret;
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ssize_t dlen;
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int secretlen;
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int outlen;
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struct keyctl_dh_params pcopy;
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struct dh dh_inputs;
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struct scatterlist outsg;
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DECLARE_CRYPTO_WAIT(compl);
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struct crypto_kpp *tfm;
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struct kpp_request *req;
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uint8_t *secret;
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uint8_t *outbuf;
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struct crypto_shash *hash = NULL;
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if (!params || (!buffer && buflen)) {
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ret = -EINVAL;
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goto out1;
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}
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if (copy_from_user(&pcopy, params, sizeof(pcopy)) != 0) {
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ret = -EFAULT;
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goto out1;
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}
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if (kdfcopy) {
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char *hashname;
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if (memchr_inv(kdfcopy->__spare, 0, sizeof(kdfcopy->__spare))) {
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ret = -EINVAL;
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goto out1;
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}
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if (buflen > KEYCTL_KDF_MAX_OUTPUT_LEN ||
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kdfcopy->otherinfolen > KEYCTL_KDF_MAX_OI_LEN) {
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ret = -EMSGSIZE;
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goto out1;
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}
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/* get KDF name string */
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hashname = strndup_user(kdfcopy->hashname, CRYPTO_MAX_ALG_NAME);
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if (IS_ERR(hashname)) {
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ret = PTR_ERR(hashname);
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goto out1;
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}
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/* allocate KDF from the kernel crypto API */
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ret = kdf_alloc(&hash, hashname);
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kfree(hashname);
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if (ret)
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goto out1;
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}
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memset(&dh_inputs, 0, sizeof(dh_inputs));
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dlen = dh_data_from_key(pcopy.prime, &dh_inputs.p);
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if (dlen < 0) {
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ret = dlen;
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goto out1;
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}
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dh_inputs.p_size = dlen;
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dlen = dh_data_from_key(pcopy.base, &dh_inputs.g);
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if (dlen < 0) {
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ret = dlen;
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goto out2;
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}
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dh_inputs.g_size = dlen;
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dlen = dh_data_from_key(pcopy.private, &dh_inputs.key);
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if (dlen < 0) {
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ret = dlen;
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goto out2;
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}
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dh_inputs.key_size = dlen;
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secretlen = crypto_dh_key_len(&dh_inputs);
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secret = kmalloc(secretlen, GFP_KERNEL);
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if (!secret) {
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ret = -ENOMEM;
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goto out2;
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}
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ret = crypto_dh_encode_key(secret, secretlen, &dh_inputs);
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if (ret)
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goto out3;
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tfm = crypto_alloc_kpp("dh", 0, 0);
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if (IS_ERR(tfm)) {
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ret = PTR_ERR(tfm);
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goto out3;
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}
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ret = crypto_kpp_set_secret(tfm, secret, secretlen);
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if (ret)
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goto out4;
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outlen = crypto_kpp_maxsize(tfm);
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if (!kdfcopy) {
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/*
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* When not using a KDF, buflen 0 is used to read the
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* required buffer length
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*/
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if (buflen == 0) {
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ret = outlen;
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goto out4;
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} else if (outlen > buflen) {
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ret = -EOVERFLOW;
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goto out4;
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}
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}
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outbuf = kzalloc(kdfcopy ? (outlen + kdfcopy->otherinfolen) : outlen,
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GFP_KERNEL);
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if (!outbuf) {
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ret = -ENOMEM;
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goto out4;
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}
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sg_init_one(&outsg, outbuf, outlen);
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req = kpp_request_alloc(tfm, GFP_KERNEL);
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if (!req) {
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ret = -ENOMEM;
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goto out5;
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}
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kpp_request_set_input(req, NULL, 0);
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kpp_request_set_output(req, &outsg, outlen);
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kpp_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG |
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CRYPTO_TFM_REQ_MAY_SLEEP,
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crypto_req_done, &compl);
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/*
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* For DH, generate_public_key and generate_shared_secret are
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* the same calculation
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*/
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ret = crypto_kpp_generate_public_key(req);
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ret = crypto_wait_req(ret, &compl);
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if (ret)
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goto out6;
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if (kdfcopy) {
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/*
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* Concatenate SP800-56A otherinfo past DH shared secret -- the
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* input to the KDF is (DH shared secret || otherinfo)
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*/
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if (copy_from_user(outbuf + req->dst_len, kdfcopy->otherinfo,
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kdfcopy->otherinfolen) != 0) {
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ret = -EFAULT;
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goto out6;
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}
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ret = keyctl_dh_compute_kdf(hash, buffer, buflen, outbuf,
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req->dst_len + kdfcopy->otherinfolen);
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} else if (copy_to_user(buffer, outbuf, req->dst_len) == 0) {
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ret = req->dst_len;
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} else {
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ret = -EFAULT;
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}
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out6:
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kpp_request_free(req);
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out5:
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kfree_sensitive(outbuf);
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out4:
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crypto_free_kpp(tfm);
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out3:
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kfree_sensitive(secret);
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out2:
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dh_free_data(&dh_inputs);
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out1:
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kdf_dealloc(hash);
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return ret;
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}
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long keyctl_dh_compute(struct keyctl_dh_params __user *params,
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char __user *buffer, size_t buflen,
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struct keyctl_kdf_params __user *kdf)
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{
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struct keyctl_kdf_params kdfcopy;
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if (!kdf)
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return __keyctl_dh_compute(params, buffer, buflen, NULL);
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if (copy_from_user(&kdfcopy, kdf, sizeof(kdfcopy)) != 0)
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return -EFAULT;
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return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy);
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}
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