From 50d7bf3d3dc47b13de6aefc397bd75ce145b9ef4 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Fri, 26 Feb 2016 12:44:09 +0100 Subject: crypto: algif_skcipher - Add nokey compatibility path commit a0fa2d037129a9849918a92d91b79ed6c7bd2818 upstream. This patch adds a compatibility path to support old applications that do acept(2) before setkey. Cc: stable@vger.kernel.org Signed-off-by: Herbert Xu [backported to 3.18 by Milan Broz ] Signed-off-by: Sasha Levin --- crypto/algif_skcipher.c | 149 ++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 144 insertions(+), 5 deletions(-) (limited to 'crypto') diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c index f05072991d7c..88ce9d837f3f 100644 --- a/crypto/algif_skcipher.c +++ b/crypto/algif_skcipher.c @@ -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(NULL, 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(NULL, 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; @@ -644,12 +757,38 @@ 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 }; -- cgit v1.2.3