524 строки
10 KiB
C
524 строки
10 KiB
C
/*
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* algif_hash: User-space interface for hash algorithms
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*
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* This file provides the user-space API for hash algorithms.
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*
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* Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
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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/hash.h>
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#include <crypto/if_alg.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/net.h>
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#include <net/sock.h>
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struct hash_ctx {
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struct af_alg_sgl sgl;
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u8 *result;
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struct af_alg_completion completion;
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unsigned int len;
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bool more;
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struct ahash_request req;
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};
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struct algif_hash_tfm {
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struct crypto_ahash *hash;
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bool has_key;
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};
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static int hash_alloc_result(struct sock *sk, struct hash_ctx *ctx)
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{
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unsigned ds;
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if (ctx->result)
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return 0;
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ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
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ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
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if (!ctx->result)
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return -ENOMEM;
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memset(ctx->result, 0, ds);
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return 0;
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}
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static void hash_free_result(struct sock *sk, struct hash_ctx *ctx)
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{
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unsigned ds;
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if (!ctx->result)
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return;
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ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
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sock_kzfree_s(sk, ctx->result, ds);
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ctx->result = NULL;
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}
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static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
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size_t ignored)
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{
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int limit = ALG_MAX_PAGES * PAGE_SIZE;
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct hash_ctx *ctx = ask->private;
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long copied = 0;
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int err;
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if (limit > sk->sk_sndbuf)
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limit = sk->sk_sndbuf;
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lock_sock(sk);
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if (!ctx->more) {
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if ((msg->msg_flags & MSG_MORE))
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hash_free_result(sk, ctx);
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err = af_alg_wait_for_completion(crypto_ahash_init(&ctx->req),
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&ctx->completion);
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if (err)
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goto unlock;
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}
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ctx->more = 0;
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while (msg_data_left(msg)) {
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int len = msg_data_left(msg);
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if (len > limit)
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len = limit;
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len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
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if (len < 0) {
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err = copied ? 0 : len;
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goto unlock;
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}
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ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
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err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
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&ctx->completion);
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af_alg_free_sg(&ctx->sgl);
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if (err)
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goto unlock;
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copied += len;
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iov_iter_advance(&msg->msg_iter, len);
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}
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err = 0;
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ctx->more = msg->msg_flags & MSG_MORE;
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if (!ctx->more) {
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err = hash_alloc_result(sk, ctx);
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if (err)
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goto unlock;
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ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
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err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
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&ctx->completion);
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}
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unlock:
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release_sock(sk);
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return err ?: copied;
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}
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static ssize_t hash_sendpage(struct socket *sock, struct page *page,
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int offset, size_t size, int flags)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct hash_ctx *ctx = ask->private;
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int err;
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if (flags & MSG_SENDPAGE_NOTLAST)
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flags |= MSG_MORE;
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lock_sock(sk);
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sg_init_table(ctx->sgl.sg, 1);
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sg_set_page(ctx->sgl.sg, page, size, offset);
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if (!(flags & MSG_MORE)) {
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err = hash_alloc_result(sk, ctx);
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if (err)
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goto unlock;
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} else if (!ctx->more)
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hash_free_result(sk, ctx);
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ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
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if (!(flags & MSG_MORE)) {
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if (ctx->more)
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err = crypto_ahash_finup(&ctx->req);
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else
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err = crypto_ahash_digest(&ctx->req);
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} else {
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if (!ctx->more) {
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err = crypto_ahash_init(&ctx->req);
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err = af_alg_wait_for_completion(err, &ctx->completion);
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if (err)
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goto unlock;
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}
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err = crypto_ahash_update(&ctx->req);
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}
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err = af_alg_wait_for_completion(err, &ctx->completion);
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if (err)
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goto unlock;
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ctx->more = flags & MSG_MORE;
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unlock:
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release_sock(sk);
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return err ?: size;
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}
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static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
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int flags)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct hash_ctx *ctx = ask->private;
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unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
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bool result;
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int err;
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if (len > ds)
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len = ds;
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else if (len < ds)
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msg->msg_flags |= MSG_TRUNC;
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lock_sock(sk);
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result = ctx->result;
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err = hash_alloc_result(sk, ctx);
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if (err)
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goto unlock;
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ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
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if (ctx->more) {
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ctx->more = 0;
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err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
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&ctx->completion);
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if (err)
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goto unlock;
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} else if (!result) {
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err = af_alg_wait_for_completion(
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crypto_ahash_digest(&ctx->req),
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&ctx->completion);
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}
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err = memcpy_to_msg(msg, ctx->result, len);
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hash_free_result(sk, ctx);
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unlock:
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release_sock(sk);
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return err ?: len;
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}
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static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct hash_ctx *ctx = ask->private;
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struct ahash_request *req = &ctx->req;
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char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
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struct sock *sk2;
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struct alg_sock *ask2;
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struct hash_ctx *ctx2;
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bool more;
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int err;
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lock_sock(sk);
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more = ctx->more;
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err = more ? crypto_ahash_export(req, state) : 0;
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release_sock(sk);
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if (err)
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return err;
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err = af_alg_accept(ask->parent, newsock);
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if (err)
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return err;
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sk2 = newsock->sk;
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ask2 = alg_sk(sk2);
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ctx2 = ask2->private;
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ctx2->more = more;
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if (!more)
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return err;
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err = crypto_ahash_import(&ctx2->req, state);
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if (err) {
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sock_orphan(sk2);
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sock_put(sk2);
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}
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return err;
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}
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static struct proto_ops algif_hash_ops = {
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.family = PF_ALG,
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.connect = sock_no_connect,
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.socketpair = sock_no_socketpair,
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.getname = sock_no_getname,
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.ioctl = sock_no_ioctl,
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.listen = sock_no_listen,
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.shutdown = sock_no_shutdown,
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.getsockopt = sock_no_getsockopt,
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.mmap = sock_no_mmap,
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.bind = sock_no_bind,
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.setsockopt = sock_no_setsockopt,
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.poll = sock_no_poll,
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.release = af_alg_release,
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.sendmsg = hash_sendmsg,
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.sendpage = hash_sendpage,
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.recvmsg = hash_recvmsg,
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.accept = hash_accept,
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};
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static int hash_check_key(struct socket *sock)
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{
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int err = 0;
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struct sock *psk;
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struct alg_sock *pask;
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struct algif_hash_tfm *tfm;
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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lock_sock(sk);
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if (ask->refcnt)
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goto unlock_child;
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psk = ask->parent;
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pask = alg_sk(ask->parent);
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tfm = pask->private;
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err = -ENOKEY;
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lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
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if (!tfm->has_key)
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goto unlock;
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if (!pask->refcnt++)
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sock_hold(psk);
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ask->refcnt = 1;
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sock_put(psk);
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err = 0;
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unlock:
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release_sock(psk);
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unlock_child:
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release_sock(sk);
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return err;
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}
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static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
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size_t size)
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{
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int err;
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err = hash_check_key(sock);
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if (err)
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return err;
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return hash_sendmsg(sock, msg, size);
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}
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static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
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int offset, size_t size, int flags)
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{
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int err;
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err = hash_check_key(sock);
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if (err)
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return err;
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return hash_sendpage(sock, page, offset, size, flags);
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}
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static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
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size_t ignored, int flags)
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{
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int err;
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err = hash_check_key(sock);
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if (err)
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return err;
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return hash_recvmsg(sock, msg, ignored, flags);
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}
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static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
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int flags)
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{
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int err;
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err = hash_check_key(sock);
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if (err)
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return err;
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return hash_accept(sock, newsock, flags);
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}
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static struct proto_ops algif_hash_ops_nokey = {
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.family = PF_ALG,
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.connect = sock_no_connect,
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.socketpair = sock_no_socketpair,
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.getname = sock_no_getname,
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.ioctl = sock_no_ioctl,
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.listen = sock_no_listen,
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.shutdown = sock_no_shutdown,
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.getsockopt = sock_no_getsockopt,
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.mmap = sock_no_mmap,
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.bind = sock_no_bind,
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.setsockopt = sock_no_setsockopt,
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.poll = sock_no_poll,
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.release = af_alg_release,
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.sendmsg = hash_sendmsg_nokey,
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.sendpage = hash_sendpage_nokey,
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.recvmsg = hash_recvmsg_nokey,
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.accept = hash_accept_nokey,
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};
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static void *hash_bind(const char *name, u32 type, u32 mask)
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{
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struct algif_hash_tfm *tfm;
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struct crypto_ahash *hash;
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tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
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if (!tfm)
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return ERR_PTR(-ENOMEM);
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hash = crypto_alloc_ahash(name, type, mask);
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if (IS_ERR(hash)) {
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kfree(tfm);
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return ERR_CAST(hash);
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}
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tfm->hash = hash;
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return tfm;
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}
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static void hash_release(void *private)
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{
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struct algif_hash_tfm *tfm = private;
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crypto_free_ahash(tfm->hash);
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kfree(tfm);
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}
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static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
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{
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struct algif_hash_tfm *tfm = private;
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int err;
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err = crypto_ahash_setkey(tfm->hash, key, keylen);
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tfm->has_key = !err;
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return err;
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}
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static void hash_sock_destruct(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct hash_ctx *ctx = ask->private;
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hash_free_result(sk, ctx);
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sock_kfree_s(sk, ctx, ctx->len);
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af_alg_release_parent(sk);
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}
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static int hash_accept_parent_nokey(void *private, struct sock *sk)
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{
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struct hash_ctx *ctx;
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struct alg_sock *ask = alg_sk(sk);
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struct algif_hash_tfm *tfm = private;
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struct crypto_ahash *hash = tfm->hash;
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unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
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ctx = sock_kmalloc(sk, len, GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->result = NULL;
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ctx->len = len;
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ctx->more = 0;
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af_alg_init_completion(&ctx->completion);
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ask->private = ctx;
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ahash_request_set_tfm(&ctx->req, hash);
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ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
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af_alg_complete, &ctx->completion);
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sk->sk_destruct = hash_sock_destruct;
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return 0;
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}
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static int hash_accept_parent(void *private, struct sock *sk)
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{
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struct algif_hash_tfm *tfm = private;
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if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
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return -ENOKEY;
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return hash_accept_parent_nokey(private, sk);
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}
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static const struct af_alg_type algif_type_hash = {
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.bind = hash_bind,
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.release = hash_release,
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.setkey = hash_setkey,
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.accept = hash_accept_parent,
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.accept_nokey = hash_accept_parent_nokey,
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.ops = &algif_hash_ops,
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.ops_nokey = &algif_hash_ops_nokey,
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.name = "hash",
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.owner = THIS_MODULE
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};
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static int __init algif_hash_init(void)
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{
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return af_alg_register_type(&algif_type_hash);
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}
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static void __exit algif_hash_exit(void)
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{
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int err = af_alg_unregister_type(&algif_type_hash);
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BUG_ON(err);
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}
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module_init(algif_hash_init);
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module_exit(algif_hash_exit);
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MODULE_LICENSE("GPL");
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