Commit ec585cac authored by Herbert Xu's avatar Herbert Xu Committed by Luis Henriques

crypto: algif_skcipher - Add nokey compatibility path

commit a0fa2d03 upstream.

This patch adds a compatibility path to support old applications
that do acept(2) before setkey.
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
[bwh: Backported to 3.2: add struct kiocb * parameter to {recv,send}msg ops]
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 21a017c3
......@@ -549,6 +549,99 @@ static struct proto_ops algif_skcipher_ops = {
.poll = skcipher_poll,
};
static int skcipher_check_key(struct socket *sock)
{
int err;
struct sock *psk;
struct alg_sock *pask;
struct skcipher_tfm *tfm;
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
if (ask->refcnt)
return 0;
psk = ask->parent;
pask = alg_sk(ask->parent);
tfm = pask->private;
err = -ENOKEY;
lock_sock(psk);
if (!tfm->has_key)
goto unlock;
if (!pask->refcnt++)
sock_hold(psk);
ask->refcnt = 1;
sock_put(psk);
err = 0;
unlock:
release_sock(psk);
return err;
}
static int skcipher_sendmsg_nokey(struct kiocb *unused, struct socket *sock,
struct msghdr *msg, size_t size)
{
int err;
err = skcipher_check_key(sock);
if (err)
return err;
return skcipher_sendmsg(unused, sock, msg, size);
}
static ssize_t skcipher_sendpage_nokey(struct socket *sock, struct page *page,
int offset, size_t size, int flags)
{
int err;
err = skcipher_check_key(sock);
if (err)
return err;
return skcipher_sendpage(sock, page, offset, size, flags);
}
static int skcipher_recvmsg_nokey(struct kiocb *unused, struct socket *sock,
struct msghdr *msg, size_t ignored, int flags)
{
int err;
err = skcipher_check_key(sock);
if (err)
return err;
return skcipher_recvmsg(unused, sock, msg, ignored, flags);
}
static struct proto_ops algif_skcipher_ops_nokey = {
.family = PF_ALG,
.connect = sock_no_connect,
.socketpair = sock_no_socketpair,
.getname = sock_no_getname,
.ioctl = sock_no_ioctl,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
.getsockopt = sock_no_getsockopt,
.mmap = sock_no_mmap,
.bind = sock_no_bind,
.accept = sock_no_accept,
.setsockopt = sock_no_setsockopt,
.release = af_alg_release,
.sendmsg = skcipher_sendmsg_nokey,
.sendpage = skcipher_sendpage_nokey,
.recvmsg = skcipher_recvmsg_nokey,
.poll = skcipher_poll,
};
static void *skcipher_bind(const char *name, u32 type, u32 mask)
{
struct skcipher_tfm *tfm;
......@@ -588,7 +681,7 @@ static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
return err;
}
static void skcipher_sock_destruct(struct sock *sk)
static void skcipher_sock_destruct_common(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
......@@ -597,10 +690,33 @@ static void skcipher_sock_destruct(struct sock *sk)
skcipher_free_sgl(sk);
sock_kfree_s(sk, ctx->iv, crypto_ablkcipher_ivsize(tfm));
sock_kfree_s(sk, ctx, ctx->len);
}
static void skcipher_sock_destruct(struct sock *sk)
{
skcipher_sock_destruct_common(sk);
af_alg_release_parent(sk);
}
static int skcipher_accept_parent(void *private, struct sock *sk)
static void skcipher_release_parent_nokey(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
if (!ask->refcnt) {
sock_put(ask->parent);
return;
}
af_alg_release_parent(sk);
}
static void skcipher_sock_destruct_nokey(struct sock *sk)
{
skcipher_sock_destruct_common(sk);
skcipher_release_parent_nokey(sk);
}
static int skcipher_accept_parent_common(void *private, struct sock *sk)
{
struct skcipher_ctx *ctx;
struct alg_sock *ask = alg_sk(sk);
......@@ -608,9 +724,6 @@ static int skcipher_accept_parent(void *private, struct sock *sk)
struct crypto_ablkcipher *skcipher = tfm->skcipher;
unsigned int len = sizeof(*ctx) + crypto_ablkcipher_reqsize(skcipher);
if (!tfm->has_key)
return -ENOKEY;
ctx = sock_kmalloc(sk, len, GFP_KERNEL);
if (!ctx)
return -ENOMEM;
......@@ -643,12 +756,38 @@ static int skcipher_accept_parent(void *private, struct sock *sk)
return 0;
}
static int skcipher_accept_parent(void *private, struct sock *sk)
{
struct skcipher_tfm *tfm = private;
if (!tfm->has_key)
return -ENOKEY;
return skcipher_accept_parent_common(private, sk);
}
static int skcipher_accept_parent_nokey(void *private, struct sock *sk)
{
int err;
err = skcipher_accept_parent_common(private, sk);
if (err)
goto out;
sk->sk_destruct = skcipher_sock_destruct_nokey;
out:
return err;
}
static const struct af_alg_type algif_type_skcipher = {
.bind = skcipher_bind,
.release = skcipher_release,
.setkey = skcipher_setkey,
.accept = skcipher_accept_parent,
.accept_nokey = skcipher_accept_parent_nokey,
.ops = &algif_skcipher_ops,
.ops_nokey = &algif_skcipher_ops_nokey,
.name = "skcipher",
.owner = THIS_MODULE
};
......
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