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[PATCH v6 0/6] crypto: algif - add akcipher

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  [PATCH v6 0/6] crypto: algif - add akcipher Tadeusz Struk <tadeusz.struk@intel.com> - 2016-05-16 04:10 +0200
    Re: [PATCH v6 0/6] crypto: algif - add akcipher Stephan Mueller <smueller@chronox.de> - 2016-05-16 04:10 +0200
    [PATCH v6 6/6] crypto: AF_ALG - add support for key_id Tadeusz Struk <tadeusz.struk@intel.com> - 2016-05-16 04:10 +0200
      Re: [PATCH v6 6/6] crypto: AF_ALG - add support for key_id Mat Martineau <mathew.j.martineau@linux.intel.com> - 2016-05-26 02:50 +0200
    [PATCH v6 4/6] crypto: algif_akcipher - enable compilation Tadeusz Struk <tadeusz.struk@intel.com> - 2016-05-16 04:10 +0200
    [PATCH v6 2/6] crypto: AF_ALG -- add setpubkey setsockopt call Tadeusz Struk <tadeusz.struk@intel.com> - 2016-05-16 04:10 +0200
    [PATCH v6 3/6] crypto: AF_ALG -- add asymmetric cipher interface Tadeusz Struk <tadeusz.struk@intel.com> - 2016-05-16 04:10 +0200
    [PATCH v6 1/6] crypto: AF_ALG -- add sign/verify API Tadeusz Struk <tadeusz.struk@intel.com> - 2016-05-16 04:10 +0200
    [PATCH v6 5/6] crypto: algif_akcipher - add ops_nokey Tadeusz Struk <tadeusz.struk@intel.com> - 2016-05-16 04:10 +0200
    Re: [PATCH v6 0/6] crypto: algif - add akcipher Tadeusz Struk <tadeusz.struk@intel.com> - 2016-05-16 22:50 +0200

#1401173 — [PATCH v6 0/6] crypto: algif - add akcipher

First four patches are a resend of the v3 algif_akcipher from
Stephan Mueller, with minor changes after rebase on top of 4.6-rc1.

The next three patches add support for keys stored in system
keyring subsystem.

First patch adds algif_akcipher nokey hadlers.

Second patch adds generic sign, verify, encrypt, decrypt accessors
functions to the asymmetric key type. These will be defined by
asymmetric subtypes, similarly to how public_key currently defines
the verify_signature function.

Third patch adds support for ALG_SET_KEY_ID and ALG_SET_PUBKEY_ID
commands to AF_ALG and setkeyid operation to the af_alg_type struct.
If the keyid is used then the afalg layer acquires the key for the
keyring subsystem and uses the new asymmetric accessor functions
instead of akcipher api. The asymmetric subtypes can use akcipher
api internally.

This is the same v5 version as before rebased on top of
http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=keys-asym-keyctl

v6 changes:
- update to reflect changes in kernel_pkey_params struct

v5 changes:
- drop public key changes and use new version provided by David

v4 changes:
- don't use internal public_key struct in af_alg.
- add generic accessor functions to asymmetric key type, which take
  the generic struct key type and resolve the specific subtype internally

v3 changes:
- include Stephan's patches (rebased on 4.6-rc1)
- add algif_akcipher nokey hadlers
- add public_key info struct to public_key and helper query functions
- add a check if a key is a software accessible key on af_alg, and
  return -ENOKEY if it isn't

v2 changes:
- pass the original skcipher request in ablkcipher.base.data instead of
  casting it back from the ablkcipher request.
- rename _req to base_req
- dropped 3/3

---

Stephan Mueller (4):
      crypto: AF_ALG -- add sign/verify API
      crypto: AF_ALG -- add setpubkey setsockopt call
      crypto: AF_ALG -- add asymmetric cipher interface
      crypto: algif_akcipher - enable compilation

Tadeusz Struk (2):
      crypto: algif_akcipher - add ops_nokey
      crypto: AF_ALG - add support for key_id

 crypto/Kconfig              |    9 
 crypto/Makefile             |    1 
 crypto/af_alg.c             |   28 +
 crypto/algif_akcipher.c     |  884 +++++++++++++++++++++++++++++++++++++++++++
 include/crypto/if_alg.h     |    2 
 include/uapi/linux/if_alg.h |    5 
 6 files changed, 924 insertions(+), 5 deletions(-)
 create mode 100644 crypto/algif_akcipher.c

--
TS

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#1401191

Am Samstag, 14. Mai 2016, 21:16:45 schrieb Tadeusz Struk:

Hi Tadeusz,

> First four patches are a resend of the v3 algif_akcipher from
> Stephan Mueller, with minor changes after rebase on top of 4.6-rc1.

All four patches from me:

Acked-by: Stephan Mueller <smueller@chronox.de>

Ciao
Stephan

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#1401218 — [PATCH v6 6/6] crypto: AF_ALG - add support for key_id

This patch adds support for asymmetric key type to AF_ALG.
It will work as follows: A new PF_ALG socket options are
added on top of existing ALG_SET_KEY and ALG_SET_PUBKEY, namely
ALG_SET_KEY_ID and ALG_SET_PUBKEY_ID for setting public and
private keys respectively. When these new options will be used
the user, instead of providing the key material, will provide a
key id and the key itself will be obtained from kernel keyring
subsystem. The user will use the standard tools (keyctl tool
		or the keyctl syscall) for key instantiation and to obtain the
key id. The key id can also be obtained by reading the
/proc/keys file.

When a key corresponding to the given keyid is found, it is stored
in the socket context and subsequent crypto operation invoked by the
user will use the new asymmetric accessor functions instead of akcipher
api. The asymmetric subtype can internally use akcipher api or
invoke operations defined by a given subtype, depending on the
key type.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
---
 crypto/af_alg.c             |   10 ++
 crypto/algif_akcipher.c     |  207 ++++++++++++++++++++++++++++++++++++++++++-
 include/crypto/if_alg.h     |    1 
 include/uapi/linux/if_alg.h |    2 
 4 files changed, 215 insertions(+), 5 deletions(-)

diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 24dc082..59c8244 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -260,6 +260,16 @@ static int alg_setsockopt(struct socket *sock, int level, int optname,
 
 		err = alg_setkey(sk, optval, optlen, type->setpubkey);
 		break;
+
+	case ALG_SET_KEY_ID:
+	case ALG_SET_PUBKEY_ID:
+		/* ALG_SET_KEY_ID is only for akcipher */
+		if (!strcmp(type->name, "akcipher") ||
+		    sock->state == SS_CONNECTED)
+			goto unlock;
+
+		err = alg_setkey(sk, optval, optlen, type->setkeyid);
+		break;
 	case ALG_SET_AEAD_AUTHSIZE:
 		if (sock->state == SS_CONNECTED)
 			goto unlock;
diff --git a/crypto/algif_akcipher.c b/crypto/algif_akcipher.c
index e00793d..6733df1 100644
--- a/crypto/algif_akcipher.c
+++ b/crypto/algif_akcipher.c
@@ -14,6 +14,8 @@
 #include <crypto/akcipher.h>
 #include <crypto/scatterwalk.h>
 #include <crypto/if_alg.h>
+#include <crypto/public_key.h>
+#include <keys/asymmetric-type.h>
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/kernel.h>
@@ -29,6 +31,7 @@ struct akcipher_sg_list {
 
 struct akcipher_tfm {
 	struct crypto_akcipher *akcipher;
+	char keyid[12];
 	bool has_key;
 };
 
@@ -37,6 +40,7 @@ struct akcipher_ctx {
 	struct af_alg_sgl rsgl[ALG_MAX_PAGES];
 
 	struct af_alg_completion completion;
+	struct key *key;
 
 	unsigned long used;
 
@@ -322,6 +326,153 @@ unlock:
 	return err ? err : size;
 }
 
+static int asym_key_encrypt(const struct key *key, struct akcipher_request *req)
+{
+	struct kernel_pkey_params params = {0};
+	char *src = NULL, *dst = NULL, *in, *out;
+	int ret;
+
+	if (!sg_is_last(req->src)) {
+		src = kmalloc(req->src_len, GFP_KERNEL);
+		if (!src)
+			return -ENOMEM;
+		scatterwalk_map_and_copy(src, req->src, 0, req->src_len, 0);
+		in = src;
+	} else {
+		in = sg_virt(req->src);
+	}
+	if (!sg_is_last(req->dst)) {
+		dst = kmalloc(req->dst_len, GFP_KERNEL);
+		if (!dst) {
+			kfree(src);
+			return -ENOMEM;
+		}
+		out = dst;
+	} else {
+		out = sg_virt(req->dst);
+	}
+	params.key = (struct key *)key;
+	params.in_len = req->src_len;
+	params.out_len = req->dst_len;
+	ret = encrypt_blob(&params, in, out);
+	if (ret)
+		goto free;
+
+	if (dst)
+		scatterwalk_map_and_copy(dst, req->dst, 0, req->dst_len, 1);
+free:
+	kfree(src);
+	kfree(dst);
+	return ret;
+}
+
+static int asym_key_decrypt(const struct key *key, struct akcipher_request *req)
+{
+	struct kernel_pkey_params params = {0};
+	char *src = NULL, *dst = NULL, *in, *out;
+	int ret;
+
+	if (!sg_is_last(req->src)) {
+		src = kmalloc(req->src_len, GFP_KERNEL);
+		if (!src)
+			return -ENOMEM;
+		scatterwalk_map_and_copy(src, req->src, 0, req->src_len, 0);
+		in = src;
+	} else {
+		in = sg_virt(req->src);
+	}
+	if (!sg_is_last(req->dst)) {
+		dst = kmalloc(req->dst_len, GFP_KERNEL);
+		if (!dst) {
+			kfree(src);
+			return -ENOMEM;
+		}
+		out = dst;
+	} else {
+		out = sg_virt(req->dst);
+	}
+	params.key = (struct key *)key;
+	params.in_len = req->src_len;
+	params.out_len = req->dst_len;
+	ret = decrypt_blob(&params, in, out);
+	if (ret)
+		goto free;
+
+	if (dst)
+		scatterwalk_map_and_copy(dst, req->dst, 0, req->dst_len, 1);
+free:
+	kfree(src);
+	kfree(dst);
+	return ret;
+}
+
+static int asym_key_sign(const struct key *key, struct akcipher_request *req)
+{
+	struct kernel_pkey_params params = {0};
+	char *src = NULL, *dst = NULL, *in, *out;
+	int ret;
+
+	if (!sg_is_last(req->src)) {
+		src = kmalloc(req->src_len, GFP_KERNEL);
+		if (!src)
+			return -ENOMEM;
+		scatterwalk_map_and_copy(src, req->src, 0, req->src_len, 0);
+		in = src;
+	} else {
+		in = sg_virt(req->src);
+	}
+	if (!sg_is_last(req->dst)) {
+		dst = kmalloc(req->dst_len, GFP_KERNEL);
+		if (!dst) {
+			kfree(src);
+			return -ENOMEM;
+		}
+		out = dst;
+	} else {
+		out = sg_virt(req->dst);
+	}
+	params.key = (struct key *)key;
+	params.in_len = req->src_len;
+	params.out_len = req->dst_len;
+	ret = create_signature(&params, in, out);
+	if (ret)
+		goto free;
+
+	if (dst)
+		scatterwalk_map_and_copy(dst, req->dst, 0, req->dst_len, 1);
+free:
+	kfree(src);
+	kfree(dst);
+	return ret;
+}
+
+static int asym_key_verify(const struct key *key, struct akcipher_request *req)
+{
+	struct public_key_signature sig;
+	char *src = NULL, *in;
+	int ret;
+
+	if (!sg_is_last(req->src)) {
+		src = kmalloc(req->src_len, GFP_KERNEL);
+		if (!src)
+			return -ENOMEM;
+		scatterwalk_map_and_copy(src, req->src, 0, req->src_len, 0);
+		in = src;
+	} else {
+		in = sg_virt(req->src);
+	}
+	sig.pkey_algo = "rsa";
+	sig.encoding = "pkcs1";
+	/* Need to find a way to pass the hash param */
+	sig.hash_algo = "sha1";
+	sig.digest_size = 20;
+	sig.s_size = req->src_len;
+	sig.s = src;
+	ret = verify_signature(key, NULL, &sig);
+	kfree(src);
+	return ret;
+}
+
 static int akcipher_recvmsg(struct socket *sock, struct msghdr *msg,
 			    size_t ignored, int flags)
 {
@@ -377,16 +528,28 @@ static int akcipher_recvmsg(struct socket *sock, struct msghdr *msg,
 				   usedpages);
 	switch (ctx->op) {
 	case ALG_OP_VERIFY:
-		err = crypto_akcipher_verify(&ctx->req);
+		if (ctx->key)
+			err = asym_key_verify(ctx->key, &ctx->req);
+		else
+			err = crypto_akcipher_verify(&ctx->req);
 		break;
 	case ALG_OP_SIGN:
-		err = crypto_akcipher_sign(&ctx->req);
+		if (ctx->key)
+			err = asym_key_sign(ctx->key, &ctx->req);
+		else
+			err = crypto_akcipher_sign(&ctx->req);
 		break;
 	case ALG_OP_ENCRYPT:
-		err = crypto_akcipher_encrypt(&ctx->req);
+		if (ctx->key)
+			err = asym_key_encrypt(ctx->key, &ctx->req);
+		else
+			err = crypto_akcipher_encrypt(&ctx->req);
 		break;
 	case ALG_OP_DECRYPT:
-		err = crypto_akcipher_decrypt(&ctx->req);
+		if (ctx->key)
+			err = asym_key_decrypt(ctx->key, &ctx->req);
+		else
+			err = crypto_akcipher_decrypt(&ctx->req);
 		break;
 	default:
 		err = -EFAULT;
@@ -579,6 +742,27 @@ static void akcipher_release(void *private)
 	kfree(tfm);
 }
 
+static int akcipher_setkeyid(void *private, const u8 *key, unsigned int keylen)
+{
+	struct akcipher_tfm *tfm = private;
+	struct key *akey;
+	u32 keyid = *((u32 *)key);
+	int err = -ENOKEY;
+
+	/* Store the key id and verify that a key with the given id is present.
+	 * The actual key will be acquired in the accept_parent function
+	 */
+	sprintf(tfm->keyid, "id:%08x", keyid);
+	akey = request_key(&key_type_asymmetric, tfm->keyid, NULL);
+	if (IS_ERR(key))
+		goto out;
+
+	tfm->has_key = true;
+	key_put(akey);
+out:
+	return err;
+}
+
 static int akcipher_setprivkey(void *private, const u8 *key,
 			       unsigned int keylen)
 {
@@ -610,6 +794,8 @@ static void akcipher_sock_destruct(struct sock *sk)
 	akcipher_put_sgl(sk);
 	sock_kfree_s(sk, ctx, ctx->len);
 	af_alg_release_parent(sk);
+	if (ctx->key)
+		key_put(ctx->key);
 }
 
 static int akcipher_accept_parent_nokey(void *private, struct sock *sk)
@@ -618,6 +804,7 @@ static int akcipher_accept_parent_nokey(void *private, struct sock *sk)
 	struct alg_sock *ask = alg_sk(sk);
 	struct akcipher_tfm *tfm = private;
 	struct crypto_akcipher *akcipher = tfm->akcipher;
+	struct key *key;
 	unsigned int len = sizeof(*ctx) + crypto_akcipher_reqsize(akcipher);
 
 	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
@@ -634,11 +821,20 @@ static int akcipher_accept_parent_nokey(void *private, struct sock *sk)
 	af_alg_init_completion(&ctx->completion);
 	sg_init_table(ctx->tsgl.sg, ALG_MAX_PAGES);
 
-	ask->private = ctx;
+	if (strlen(tfm->keyid)) {
+		key = request_key(&key_type_asymmetric, tfm->keyid, NULL);
+		if (IS_ERR(key)) {
+			sock_kfree_s(sk, ctx, len);
+			return -ENOKEY;
+		}
 
+		ctx->key = key;
+		memset(tfm->keyid, '\0', sizeof(tfm->keyid));
+	}
 	akcipher_request_set_tfm(&ctx->req, akcipher);
 	akcipher_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
 				      af_alg_complete, &ctx->completion);
+	ask->private = ctx;
 
 	sk->sk_destruct = akcipher_sock_destruct;
 
@@ -660,6 +856,7 @@ static const struct af_alg_type algif_type_akcipher = {
 	.release	=	akcipher_release,
 	.setkey		=	akcipher_setprivkey,
 	.setpubkey	=	akcipher_setpubkey,
+	.setkeyid	=	akcipher_setkeyid,
 	.accept		=	akcipher_accept_parent,
 	.accept_nokey	=	akcipher_accept_parent_nokey,
 	.ops		=	&algif_akcipher_ops,
diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h
index 6c3e6e7..09c99ab 100644
--- a/include/crypto/if_alg.h
+++ b/include/crypto/if_alg.h
@@ -53,6 +53,7 @@ struct af_alg_type {
 	void (*release)(void *private);
 	int (*setkey)(void *private, const u8 *key, unsigned int keylen);
 	int (*setpubkey)(void *private, const u8 *key, unsigned int keylen);
+	int (*setkeyid)(void *private, const u8 *key, unsigned int keylen);
 	int (*accept)(void *private, struct sock *sk);
 	int (*accept_nokey)(void *private, struct sock *sk);
 	int (*setauthsize)(void *private, unsigned int authsize);
diff --git a/include/uapi/linux/if_alg.h b/include/uapi/linux/if_alg.h
index 02e6162..0379766 100644
--- a/include/uapi/linux/if_alg.h
+++ b/include/uapi/linux/if_alg.h
@@ -35,6 +35,8 @@ struct af_alg_iv {
 #define ALG_SET_AEAD_ASSOCLEN		4
 #define ALG_SET_AEAD_AUTHSIZE		5
 #define ALG_SET_PUBKEY			6
+#define ALG_SET_PUBKEY_ID		7
+#define ALG_SET_KEY_ID			8
 
 /* Operations */
 #define ALG_OP_DECRYPT			0

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#1407313 — Re: [PATCH v6 6/6] crypto: AF_ALG - add support for key_id

On Sat, 14 May 2016, Tadeusz Struk wrote:

> diff --git a/crypto/algif_akcipher.c b/crypto/algif_akcipher.c
> index e00793d..6733df1 100644
> --- a/crypto/algif_akcipher.c
> +++ b/crypto/algif_akcipher.c
> +static int asym_key_verify(const struct key *key, struct akcipher_request *req)
> +{
> +	struct public_key_signature sig;
> +	char *src = NULL, *in;
> +	int ret;
> +
> +	if (!sg_is_last(req->src)) {
> +		src = kmalloc(req->src_len, GFP_KERNEL);
> +		if (!src)
> +			return -ENOMEM;
> +		scatterwalk_map_and_copy(src, req->src, 0, req->src_len, 0);
> +		in = src;
> +	} else {
> +		in = sg_virt(req->src);
> +	}
> +	sig.pkey_algo = "rsa";
> +	sig.encoding = "pkcs1";
> +	/* Need to find a way to pass the hash param */

Are you referring to sig.digest here? It looks like you will hit a 
BUG_ON() in public_key_verify_signature() if sig.digest is 0. However, 
sig.digest is unlikely to be 0 because the struct is not cleared - should 
fix this, since public_key_verify_signature() will try to follow that 
random pointer.

> +	sig.hash_algo = "sha1";
> +	sig.digest_size = 20;
> +	sig.s_size = req->src_len;
> +	sig.s = src;
> +	ret = verify_signature(key, NULL, &sig);

Is the idea to write the signature to the socket, and then read out the 
expected digest (the digest comparison being done elsewhere)? Is that 
something that will be supported by a future hardware asymmetric key 
subtype?

verify_signature() ends up calling public_key_verify_signature(), which 
currently expects to get both the digest and signature as input and 
returns an error if verification fails. The output of 
crypto_akcipher_verify() is discarded before public_key_verify_signature() 
returns so nothing ends up in req->dst to read from the socket.

ALG_OP_VERIFY should behave the same whether using ALG_SET_PUBKEY or 
ALG_SET_PUBKEY_ID, and they aren't right now.

If sig.digest is 0, verify_signature() could return the expected digest in 
the sig structure and skip the digest comparison it currently does. Then 
that data could be packaged up in req as if crypto_akcipher_verify() had 
been called. I don't know if this change confuses the semantics of 
verify_signature() too much, maybe a new function is required with all the 
requisite plumbing to the asymmetric key subtype.


--
Mat Martineau
Intel OTC

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#1401231 — [PATCH v6 4/6] crypto: algif_akcipher - enable compilation

From: Stephan Mueller <smueller@chronox.de>

Add the Makefile and Kconfig updates to allow algif_akcipher to be
compiled.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
---
 crypto/Kconfig  |    9 +++++++++
 crypto/Makefile |    1 +
 2 files changed, 10 insertions(+)

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 93a1fdc..b932319 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1626,6 +1626,15 @@ config CRYPTO_USER_API_AEAD
 	  This option enables the user-spaces interface for AEAD
 	  cipher algorithms.
 
+config CRYPTO_USER_API_AKCIPHER
+	tristate "User-space interface for asymmetric key cipher algorithms"
+	depends on NET
+	select CRYPTO_AKCIPHER2
+	select CRYPTO_USER_API
+	help
+	  This option enables the user-spaces interface for asymmetric
+	  key cipher algorithms.
+
 config CRYPTO_HASH_INFO
 	bool
 
diff --git a/crypto/Makefile b/crypto/Makefile
index 4f4ef7e..c51ac16 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -121,6 +121,7 @@ obj-$(CONFIG_CRYPTO_USER_API_HASH) += algif_hash.o
 obj-$(CONFIG_CRYPTO_USER_API_SKCIPHER) += algif_skcipher.o
 obj-$(CONFIG_CRYPTO_USER_API_RNG) += algif_rng.o
 obj-$(CONFIG_CRYPTO_USER_API_AEAD) += algif_aead.o
+obj-$(CONFIG_CRYPTO_USER_API_AKCIPHER) += algif_akcipher.o
 
 #
 # generic algorithms and the async_tx api

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#1401243 — [PATCH v6 2/6] crypto: AF_ALG -- add setpubkey setsockopt call

From: Stephan Mueller <smueller@chronox.de>

For supporting asymmetric ciphers, user space must be able to set the
public key. The patch adds a new setsockopt call for setting the public
key.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
---
 crypto/af_alg.c         |   18 +++++++++++++-----
 include/crypto/if_alg.h |    1 +
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index f5e18c2..24dc082 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -202,13 +202,17 @@ unlock:
 }
 
 static int alg_setkey(struct sock *sk, char __user *ukey,
-		      unsigned int keylen)
+		      unsigned int keylen,
+		      int (*setkey)(void *private, const u8 *key,
+				    unsigned int keylen))
 {
 	struct alg_sock *ask = alg_sk(sk);
-	const struct af_alg_type *type = ask->type;
 	u8 *key;
 	int err;
 
+	if (!setkey)
+		return -ENOPROTOOPT;
+
 	key = sock_kmalloc(sk, keylen, GFP_KERNEL);
 	if (!key)
 		return -ENOMEM;
@@ -217,7 +221,7 @@ static int alg_setkey(struct sock *sk, char __user *ukey,
 	if (copy_from_user(key, ukey, keylen))
 		goto out;
 
-	err = type->setkey(ask->private, key, keylen);
+	err = setkey(ask->private, key, keylen);
 
 out:
 	sock_kzfree_s(sk, key, keylen);
@@ -247,10 +251,14 @@ static int alg_setsockopt(struct socket *sock, int level, int optname,
 	case ALG_SET_KEY:
 		if (sock->state == SS_CONNECTED)
 			goto unlock;
-		if (!type->setkey)
+
+		err = alg_setkey(sk, optval, optlen, type->setkey);
+		break;
+	case ALG_SET_PUBKEY:
+		if (sock->state == SS_CONNECTED)
 			goto unlock;
 
-		err = alg_setkey(sk, optval, optlen);
+		err = alg_setkey(sk, optval, optlen, type->setpubkey);
 		break;
 	case ALG_SET_AEAD_AUTHSIZE:
 		if (sock->state == SS_CONNECTED)
diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h
index a2bfd78..6c3e6e7 100644
--- a/include/crypto/if_alg.h
+++ b/include/crypto/if_alg.h
@@ -52,6 +52,7 @@ struct af_alg_type {
 	void *(*bind)(const char *name, u32 type, u32 mask);
 	void (*release)(void *private);
 	int (*setkey)(void *private, const u8 *key, unsigned int keylen);
+	int (*setpubkey)(void *private, const u8 *key, unsigned int keylen);
 	int (*accept)(void *private, struct sock *sk);
 	int (*accept_nokey)(void *private, struct sock *sk);
 	int (*setauthsize)(void *private, unsigned int authsize);

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#1401262 — [PATCH v6 3/6] crypto: AF_ALG -- add asymmetric cipher interface

From: Stephan Mueller <smueller@chronox.de>

This patch adds the user space interface for asymmetric ciphers. The
interface allows the use of sendmsg as well as vmsplice to provide data.

This version has been rebased on top of 4.6 and a few chackpatch issues
have been fixed.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
---
 crypto/algif_akcipher.c |  542 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 542 insertions(+)
 create mode 100644 crypto/algif_akcipher.c

diff --git a/crypto/algif_akcipher.c b/crypto/algif_akcipher.c
new file mode 100644
index 0000000..6342b6e
--- /dev/null
+++ b/crypto/algif_akcipher.c
@@ -0,0 +1,542 @@
+/*
+ * algif_akcipher: User-space interface for asymmetric cipher algorithms
+ *
+ * Copyright (C) 2015, Stephan Mueller <smueller@chronox.de>
+ *
+ * This file provides the user-space API for asymmetric ciphers.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <crypto/akcipher.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/if_alg.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/net.h>
+#include <net/sock.h>
+
+struct akcipher_sg_list {
+	unsigned int cur;
+	struct scatterlist sg[ALG_MAX_PAGES];
+};
+
+struct akcipher_ctx {
+	struct akcipher_sg_list tsgl;
+	struct af_alg_sgl rsgl[ALG_MAX_PAGES];
+
+	struct af_alg_completion completion;
+
+	unsigned long used;
+
+	unsigned int len;
+	bool more;
+	bool merge;
+	int op;
+
+	struct akcipher_request req;
+};
+
+static inline int akcipher_sndbuf(struct sock *sk)
+{
+	struct alg_sock *ask = alg_sk(sk);
+	struct akcipher_ctx *ctx = ask->private;
+
+	return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) -
+			  ctx->used, 0);
+}
+
+static inline bool akcipher_writable(struct sock *sk)
+{
+	return akcipher_sndbuf(sk) >= PAGE_SIZE;
+}
+
+static inline int akcipher_calcsize(struct akcipher_ctx *ctx)
+{
+	return crypto_akcipher_maxsize(crypto_akcipher_reqtfm(&ctx->req));
+}
+
+static void akcipher_put_sgl(struct sock *sk)
+{
+	struct alg_sock *ask = alg_sk(sk);
+	struct akcipher_ctx *ctx = ask->private;
+	struct akcipher_sg_list *sgl = &ctx->tsgl;
+	struct scatterlist *sg = sgl->sg;
+	unsigned int i;
+
+	for (i = 0; i < sgl->cur; i++) {
+		if (!sg_page(sg + i))
+			continue;
+
+		put_page(sg_page(sg + i));
+		sg_assign_page(sg + i, NULL);
+	}
+	sg_init_table(sg, ALG_MAX_PAGES);
+	sgl->cur = 0;
+	ctx->used = 0;
+	ctx->more = 0;
+	ctx->merge = 0;
+}
+
+static void akcipher_wmem_wakeup(struct sock *sk)
+{
+	struct socket_wq *wq;
+
+	if (!akcipher_writable(sk))
+		return;
+
+	rcu_read_lock();
+	wq = rcu_dereference(sk->sk_wq);
+	if (wq_has_sleeper(&wq->wait))
+		wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
+							   POLLRDNORM |
+							   POLLRDBAND);
+	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
+	rcu_read_unlock();
+}
+
+static int akcipher_wait_for_data(struct sock *sk, unsigned int flags)
+{
+	struct alg_sock *ask = alg_sk(sk);
+	struct akcipher_ctx *ctx = ask->private;
+	long timeout;
+	DEFINE_WAIT(wait);
+	int err = -ERESTARTSYS;
+
+	if (flags & MSG_DONTWAIT)
+		return -EAGAIN;
+
+	set_bit(SOCKWQ_ASYNC_WAITDATA, &sk->sk_socket->flags);
+
+	for (;;) {
+		if (signal_pending(current))
+			break;
+		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
+		timeout = MAX_SCHEDULE_TIMEOUT;
+		if (sk_wait_event(sk, &timeout, !ctx->more)) {
+			err = 0;
+			break;
+		}
+	}
+	finish_wait(sk_sleep(sk), &wait);
+
+	clear_bit(SOCKWQ_ASYNC_WAITDATA, &sk->sk_socket->flags);
+
+	return err;
+}
+
+static void akcipher_data_wakeup(struct sock *sk)
+{
+	struct alg_sock *ask = alg_sk(sk);
+	struct akcipher_ctx *ctx = ask->private;
+	struct socket_wq *wq;
+
+	if (ctx->more)
+		return;
+	if (!ctx->used)
+		return;
+
+	rcu_read_lock();
+	wq = rcu_dereference(sk->sk_wq);
+	if (wq_has_sleeper(&wq->wait))
+		wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
+							   POLLRDNORM |
+							   POLLRDBAND);
+	sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
+	rcu_read_unlock();
+}
+
+static int akcipher_sendmsg(struct socket *sock, struct msghdr *msg,
+			    size_t size)
+{
+	struct sock *sk = sock->sk;
+	struct alg_sock *ask = alg_sk(sk);
+	struct akcipher_ctx *ctx = ask->private;
+	struct akcipher_sg_list *sgl = &ctx->tsgl;
+	struct af_alg_control con = {};
+	long copied = 0;
+	int op = 0;
+	bool init = 0;
+	int err;
+
+	if (msg->msg_controllen) {
+		err = af_alg_cmsg_send(msg, &con);
+		if (err)
+			return err;
+
+		init = 1;
+		switch (con.op) {
+		case ALG_OP_VERIFY:
+		case ALG_OP_SIGN:
+		case ALG_OP_ENCRYPT:
+		case ALG_OP_DECRYPT:
+			op = con.op;
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	lock_sock(sk);
+	if (!ctx->more && ctx->used)
+		goto unlock;
+
+	if (init)
+		ctx->op = op;
+
+	while (size) {
+		unsigned long len = size;
+		struct scatterlist *sg = NULL;
+
+		/* use the existing memory in an allocated page */
+		if (ctx->merge) {
+			sg = sgl->sg + sgl->cur - 1;
+			len = min_t(unsigned long, len,
+				    PAGE_SIZE - sg->offset - sg->length);
+			err = memcpy_from_msg(page_address(sg_page(sg)) +
+					      sg->offset + sg->length,
+					      msg, len);
+			if (err)
+				goto unlock;
+
+			sg->length += len;
+			ctx->merge = (sg->offset + sg->length) &
+				     (PAGE_SIZE - 1);
+
+			ctx->used += len;
+			copied += len;
+			size -= len;
+			continue;
+		}
+
+		if (!akcipher_writable(sk)) {
+			/* user space sent too much data */
+			akcipher_put_sgl(sk);
+			err = -EMSGSIZE;
+			goto unlock;
+		}
+
+		/* allocate a new page */
+		len = min_t(unsigned long, size, akcipher_sndbuf(sk));
+		while (len) {
+			int plen = 0;
+
+			if (sgl->cur >= ALG_MAX_PAGES) {
+				akcipher_put_sgl(sk);
+				err = -E2BIG;
+				goto unlock;
+			}
+
+			sg = sgl->sg + sgl->cur;
+			plen = min_t(int, len, PAGE_SIZE);
+
+			sg_assign_page(sg, alloc_page(GFP_KERNEL));
+			if (!sg_page(sg)) {
+				err = -ENOMEM;
+				goto unlock;
+			}
+
+			err = memcpy_from_msg(page_address(sg_page(sg)),
+					      msg, plen);
+			if (err) {
+				__free_page(sg_page(sg));
+				sg_assign_page(sg, NULL);
+				goto unlock;
+			}
+
+			sg->offset = 0;
+			sg->length = plen;
+			len -= plen;
+			ctx->used += plen;
+			copied += plen;
+			sgl->cur++;
+			size -= plen;
+			ctx->merge = plen & (PAGE_SIZE - 1);
+		}
+	}
+
+	err = 0;
+
+	ctx->more = msg->msg_flags & MSG_MORE;
+
+unlock:
+	akcipher_data_wakeup(sk);
+	release_sock(sk);
+
+	return err ?: copied;
+}
+
+static ssize_t akcipher_sendpage(struct socket *sock, struct page *page,
+				 int offset, size_t size, int flags)
+{
+	struct sock *sk = sock->sk;
+	struct alg_sock *ask = alg_sk(sk);
+	struct akcipher_ctx *ctx = ask->private;
+	struct akcipher_sg_list *sgl = &ctx->tsgl;
+	int err = 0;
+
+	if (flags & MSG_SENDPAGE_NOTLAST)
+		flags |= MSG_MORE;
+
+	if (sgl->cur >= ALG_MAX_PAGES)
+		return -E2BIG;
+
+	lock_sock(sk);
+	if (!ctx->more && ctx->used)
+		goto unlock;
+
+	if (!size)
+		goto done;
+
+	if (!akcipher_writable(sk)) {
+		/* user space sent too much data */
+		akcipher_put_sgl(sk);
+		err = -EMSGSIZE;
+		goto unlock;
+	}
+
+	ctx->merge = 0;
+
+	get_page(page);
+	sg_set_page(sgl->sg + sgl->cur, page, size, offset);
+	sgl->cur++;
+	ctx->used += size;
+
+done:
+	ctx->more = flags & MSG_MORE;
+unlock:
+	akcipher_data_wakeup(sk);
+	release_sock(sk);
+
+	return err ? err : size;
+}
+
+static int akcipher_recvmsg(struct socket *sock, struct msghdr *msg,
+			    size_t ignored, int flags)
+{
+	struct sock *sk = sock->sk;
+	struct alg_sock *ask = alg_sk(sk);
+	struct akcipher_ctx *ctx = ask->private;
+	struct akcipher_sg_list *sgl = &ctx->tsgl;
+	unsigned int i = 0;
+	int err;
+	unsigned long used = 0;
+	size_t usedpages = 0;
+	unsigned int cnt = 0;
+
+	/* Limit number of IOV blocks to be accessed below */
+	if (msg->msg_iter.nr_segs > ALG_MAX_PAGES)
+		return -ENOMSG;
+
+	lock_sock(sk);
+
+	if (ctx->more) {
+		err = akcipher_wait_for_data(sk, flags);
+		if (err)
+			goto unlock;
+	}
+
+	used = ctx->used;
+
+	/* convert iovecs of output buffers into scatterlists */
+	while (iov_iter_count(&msg->msg_iter)) {
+		/* make one iovec available as scatterlist */
+		err = af_alg_make_sg(&ctx->rsgl[cnt], &msg->msg_iter,
+				     iov_iter_count(&msg->msg_iter));
+		if (err < 0)
+			goto unlock;
+		usedpages += err;
+		/* chain the new scatterlist with previous one */
+		if (cnt)
+			af_alg_link_sg(&ctx->rsgl[cnt - 1], &ctx->rsgl[cnt]);
+
+		iov_iter_advance(&msg->msg_iter, err);
+		cnt++;
+	}
+
+	/* ensure output buffer is sufficiently large */
+	if (usedpages < akcipher_calcsize(ctx)) {
+		err = -EMSGSIZE;
+		goto unlock;
+	}
+
+	sg_mark_end(sgl->sg + sgl->cur - 1);
+
+	akcipher_request_set_crypt(&ctx->req, sgl->sg, ctx->rsgl[0].sg, used,
+				   usedpages);
+	switch (ctx->op) {
+	case ALG_OP_VERIFY:
+		err = crypto_akcipher_verify(&ctx->req);
+		break;
+	case ALG_OP_SIGN:
+		err = crypto_akcipher_sign(&ctx->req);
+		break;
+	case ALG_OP_ENCRYPT:
+		err = crypto_akcipher_encrypt(&ctx->req);
+		break;
+	case ALG_OP_DECRYPT:
+		err = crypto_akcipher_decrypt(&ctx->req);
+		break;
+	default:
+		err = -EFAULT;
+		goto unlock;
+	}
+
+	err = af_alg_wait_for_completion(err, &ctx->completion);
+
+	if (err) {
+		/* EBADMSG implies a valid cipher operation took place */
+		if (err == -EBADMSG)
+			akcipher_put_sgl(sk);
+		goto unlock;
+	}
+
+	akcipher_put_sgl(sk);
+
+unlock:
+	for (i = 0; i < cnt; i++)
+		af_alg_free_sg(&ctx->rsgl[i]);
+
+	akcipher_wmem_wakeup(sk);
+	release_sock(sk);
+
+	return err ? err : ctx->req.dst_len;
+}
+
+static unsigned int akcipher_poll(struct file *file, struct socket *sock,
+				  poll_table *wait)
+{
+	struct sock *sk = sock->sk;
+	struct alg_sock *ask = alg_sk(sk);
+	struct akcipher_ctx *ctx = ask->private;
+	unsigned int mask = 0;
+
+	sock_poll_wait(file, sk_sleep(sk), wait);
+
+	if (!ctx->more)
+		mask |= POLLIN | POLLRDNORM;
+
+	if (akcipher_writable(sk))
+		mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
+
+	return mask;
+}
+
+static struct proto_ops algif_akcipher_ops = {
+	.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	=	akcipher_sendmsg,
+	.sendpage	=	akcipher_sendpage,
+	.recvmsg	=	akcipher_recvmsg,
+	.poll		=	akcipher_poll,
+};
+
+static void *akcipher_bind(const char *name, u32 type, u32 mask)
+{
+	return crypto_alloc_akcipher(name, type, mask);
+}
+
+static void akcipher_release(void *private)
+{
+	crypto_free_akcipher(private);
+}
+
+static int akcipher_setprivkey(void *private, const u8 *key,
+			       unsigned int keylen)
+{
+	return crypto_akcipher_set_priv_key(private, key, keylen);
+}
+
+static int akcipher_setpubkey(void *private, const u8 *key, unsigned int keylen)
+{
+	return crypto_akcipher_set_pub_key(private, key, keylen);
+}
+
+static void akcipher_sock_destruct(struct sock *sk)
+{
+	struct alg_sock *ask = alg_sk(sk);
+	struct akcipher_ctx *ctx = ask->private;
+
+	akcipher_put_sgl(sk);
+	sock_kfree_s(sk, ctx, ctx->len);
+	af_alg_release_parent(sk);
+}
+
+static int akcipher_accept_parent(void *private, struct sock *sk)
+{
+	struct akcipher_ctx *ctx;
+	struct alg_sock *ask = alg_sk(sk);
+	unsigned int len = sizeof(*ctx) + crypto_akcipher_reqsize(private);
+
+	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+	memset(ctx, 0, len);
+
+	ctx->len = len;
+	ctx->used = 0;
+	ctx->more = 0;
+	ctx->merge = 0;
+	ctx->op = 0;
+	ctx->tsgl.cur = 0;
+	af_alg_init_completion(&ctx->completion);
+	sg_init_table(ctx->tsgl.sg, ALG_MAX_PAGES);
+
+	ask->private = ctx;
+
+	akcipher_request_set_tfm(&ctx->req, private);
+	akcipher_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+				      af_alg_complete, &ctx->completion);
+
+	sk->sk_destruct = akcipher_sock_destruct;
+
+	return 0;
+}
+
+static const struct af_alg_type algif_type_akcipher = {
+	.bind		=	akcipher_bind,
+	.release	=	akcipher_release,
+	.setkey		=	akcipher_setprivkey,
+	.setpubkey	=	akcipher_setpubkey,
+	.accept		=	akcipher_accept_parent,
+	.ops		=	&algif_akcipher_ops,
+	.name		=	"akcipher",
+	.owner		=	THIS_MODULE
+};
+
+static int __init algif_akcipher_init(void)
+{
+	return af_alg_register_type(&algif_type_akcipher);
+}
+
+static void __exit algif_akcipher_exit(void)
+{
+	int err = af_alg_unregister_type(&algif_type_akcipher);
+
+	WARN_ON(err);
+}
+
+module_init(algif_akcipher_init);
+module_exit(algif_akcipher_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Stephan Mueller <smueller@chronox.de>");
+MODULE_DESCRIPTION("Asymmetric kernel crypto API user space interface");

[toc] | [prev] | [next] | [standalone]

#1401266 — [PATCH v6 1/6] crypto: AF_ALG -- add sign/verify API

From: Stephan Mueller <smueller@chronox.de>

Add the flags for handling signature generation and signature
verification.

Also, the patch adds the interface for setting a public key.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
---
 include/uapi/linux/if_alg.h |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/uapi/linux/if_alg.h b/include/uapi/linux/if_alg.h
index f2acd2f..02e6162 100644
--- a/include/uapi/linux/if_alg.h
+++ b/include/uapi/linux/if_alg.h
@@ -34,9 +34,12 @@ struct af_alg_iv {
 #define ALG_SET_OP			3
 #define ALG_SET_AEAD_ASSOCLEN		4
 #define ALG_SET_AEAD_AUTHSIZE		5
+#define ALG_SET_PUBKEY			6
 
 /* Operations */
 #define ALG_OP_DECRYPT			0
 #define ALG_OP_ENCRYPT			1
+#define ALG_OP_SIGN			2
+#define ALG_OP_VERIFY			3
 
 #endif	/* _LINUX_IF_ALG_H */

[toc] | [prev] | [next] | [standalone]

#1401267 — [PATCH v6 5/6] crypto: algif_akcipher - add ops_nokey

Similar to algif_skcipher and algif_hash, algif_akcipher needs
to prevent user space from using the interface in an improper way.
This patch adds nokey ops handlers, which do just that.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
---
 crypto/algif_akcipher.c |  159 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 152 insertions(+), 7 deletions(-)

diff --git a/crypto/algif_akcipher.c b/crypto/algif_akcipher.c
index 6342b6e..e00793d 100644
--- a/crypto/algif_akcipher.c
+++ b/crypto/algif_akcipher.c
@@ -27,6 +27,11 @@ struct akcipher_sg_list {
 	struct scatterlist sg[ALG_MAX_PAGES];
 };
 
+struct akcipher_tfm {
+	struct crypto_akcipher *akcipher;
+	bool has_key;
+};
+
 struct akcipher_ctx {
 	struct akcipher_sg_list tsgl;
 	struct af_alg_sgl rsgl[ALG_MAX_PAGES];
@@ -450,25 +455,151 @@ static struct proto_ops algif_akcipher_ops = {
 	.poll		=	akcipher_poll,
 };
 
+static int akcipher_check_key(struct socket *sock)
+{
+	int err = 0;
+	struct sock *psk;
+	struct alg_sock *pask;
+	struct akcipher_tfm *tfm;
+	struct sock *sk = sock->sk;
+	struct alg_sock *ask = alg_sk(sk);
+
+	lock_sock(sk);
+	if (ask->refcnt)
+		goto unlock_child;
+
+	psk = ask->parent;
+	pask = alg_sk(ask->parent);
+	tfm = pask->private;
+
+	err = -ENOKEY;
+	lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
+	if (!tfm->has_key)
+		goto unlock;
+
+	if (!pask->refcnt++)
+		sock_hold(psk);
+
+	ask->refcnt = 1;
+	sock_put(psk);
+
+	err = 0;
+
+unlock:
+	release_sock(psk);
+unlock_child:
+	release_sock(sk);
+
+	return err;
+}
+
+static int akcipher_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
+				  size_t size)
+{
+	int err;
+
+	err = akcipher_check_key(sock);
+	if (err)
+		return err;
+
+	return akcipher_sendmsg(sock, msg, size);
+}
+
+static ssize_t akcipher_sendpage_nokey(struct socket *sock, struct page *page,
+				       int offset, size_t size, int flags)
+{
+	int err;
+
+	err = akcipher_check_key(sock);
+	if (err)
+		return err;
+
+	return akcipher_sendpage(sock, page, offset, size, flags);
+}
+
+static int akcipher_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
+				  size_t ignored, int flags)
+{
+	int err;
+
+	err = akcipher_check_key(sock);
+	if (err)
+		return err;
+
+	return akcipher_recvmsg(sock, msg, ignored, flags);
+}
+
+static struct proto_ops algif_akcipher_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	=	akcipher_sendmsg_nokey,
+	.sendpage	=	akcipher_sendpage_nokey,
+	.recvmsg	=	akcipher_recvmsg_nokey,
+	.poll		=	akcipher_poll,
+};
+
 static void *akcipher_bind(const char *name, u32 type, u32 mask)
 {
-	return crypto_alloc_akcipher(name, type, mask);
+	struct akcipher_tfm *tfm;
+	struct crypto_akcipher *akcipher;
+
+	tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
+	if (!tfm)
+		return ERR_PTR(-ENOMEM);
+
+	akcipher = crypto_alloc_akcipher(name, type, mask);
+	if (IS_ERR(akcipher)) {
+		kfree(tfm);
+		return ERR_CAST(akcipher);
+	}
+
+	tfm->akcipher = akcipher;
+	return tfm;
 }
 
 static void akcipher_release(void *private)
 {
-	crypto_free_akcipher(private);
+	struct akcipher_tfm *tfm = private;
+	struct crypto_akcipher *akcipher = tfm->akcipher;
+
+	crypto_free_akcipher(akcipher);
+	kfree(tfm);
 }
 
 static int akcipher_setprivkey(void *private, const u8 *key,
 			       unsigned int keylen)
 {
-	return crypto_akcipher_set_priv_key(private, key, keylen);
+	struct akcipher_tfm *tfm = private;
+	struct crypto_akcipher *akcipher = tfm->akcipher;
+	int err;
+
+	err = crypto_akcipher_set_priv_key(akcipher, key, keylen);
+	tfm->has_key = !err;
+	return err;
 }
 
 static int akcipher_setpubkey(void *private, const u8 *key, unsigned int keylen)
 {
-	return crypto_akcipher_set_pub_key(private, key, keylen);
+	struct akcipher_tfm *tfm = private;
+	struct crypto_akcipher *akcipher = tfm->akcipher;
+	int err;
+
+	err = crypto_akcipher_set_pub_key(akcipher, key, keylen);
+	tfm->has_key = !err;
+	return err;
 }
 
 static void akcipher_sock_destruct(struct sock *sk)
@@ -481,11 +612,13 @@ static void akcipher_sock_destruct(struct sock *sk)
 	af_alg_release_parent(sk);
 }
 
-static int akcipher_accept_parent(void *private, struct sock *sk)
+static int akcipher_accept_parent_nokey(void *private, struct sock *sk)
 {
 	struct akcipher_ctx *ctx;
 	struct alg_sock *ask = alg_sk(sk);
-	unsigned int len = sizeof(*ctx) + crypto_akcipher_reqsize(private);
+	struct akcipher_tfm *tfm = private;
+	struct crypto_akcipher *akcipher = tfm->akcipher;
+	unsigned int len = sizeof(*ctx) + crypto_akcipher_reqsize(akcipher);
 
 	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
 	if (!ctx)
@@ -503,7 +636,7 @@ static int akcipher_accept_parent(void *private, struct sock *sk)
 
 	ask->private = ctx;
 
-	akcipher_request_set_tfm(&ctx->req, private);
+	akcipher_request_set_tfm(&ctx->req, akcipher);
 	akcipher_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
 				      af_alg_complete, &ctx->completion);
 
@@ -512,13 +645,25 @@ static int akcipher_accept_parent(void *private, struct sock *sk)
 	return 0;
 }
 
+static int akcipher_accept_parent(void *private, struct sock *sk)
+{
+	struct akcipher_tfm *tfm = private;
+
+	if (!tfm->has_key)
+		return -ENOKEY;
+
+	return akcipher_accept_parent_nokey(private, sk);
+}
+
 static const struct af_alg_type algif_type_akcipher = {
 	.bind		=	akcipher_bind,
 	.release	=	akcipher_release,
 	.setkey		=	akcipher_setprivkey,
 	.setpubkey	=	akcipher_setpubkey,
 	.accept		=	akcipher_accept_parent,
+	.accept_nokey	=	akcipher_accept_parent_nokey,
 	.ops		=	&algif_akcipher_ops,
+	.ops_nokey	=	&algif_akcipher_ops_nokey,
 	.name		=	"akcipher",
 	.owner		=	THIS_MODULE
 };

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#1401767

On 05/14/2016 09:16 PM, Tadeusz Struk wrote:
> First four patches are a resend of the v3 algif_akcipher from
> Stephan Mueller, with minor changes after rebase on top of 4.6-rc1.
> 
> The next three patches add support for keys stored in system
> keyring subsystem.
> 
> First patch adds algif_akcipher nokey hadlers.
> 
> Second patch adds generic sign, verify, encrypt, decrypt accessors
> functions to the asymmetric key type. These will be defined by
> asymmetric subtypes, similarly to how public_key currently defines
> the verify_signature function.
> 
> Third patch adds support for ALG_SET_KEY_ID and ALG_SET_PUBKEY_ID
> commands to AF_ALG and setkeyid operation to the af_alg_type struct.
> If the keyid is used then the afalg layer acquires the key for the
> keyring subsystem and uses the new asymmetric accessor functions
> instead of akcipher api. The asymmetric subtypes can use akcipher
> api internally.
> 
> This is the same v5 version as before rebased on top of
> http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=keys-asym-keyctl
> 
> v6 changes:
> - update to reflect changes in kernel_pkey_params struct
> 
> v5 changes:
> - drop public key changes and use new version provided by David
> 
> v4 changes:
> - don't use internal public_key struct in af_alg.
> - add generic accessor functions to asymmetric key type, which take
>   the generic struct key type and resolve the specific subtype internally
> 
> v3 changes:
> - include Stephan's patches (rebased on 4.6-rc1)
> - add algif_akcipher nokey hadlers
> - add public_key info struct to public_key and helper query functions
> - add a check if a key is a software accessible key on af_alg, and
>   return -ENOKEY if it isn't
> 
> v2 changes:
> - pass the original skcipher request in ablkcipher.base.data instead of
>   casting it back from the ablkcipher request.
> - rename _req to base_req
> - dropped 3/3
> 
> ---
> 
> Stephan Mueller (4):
>       crypto: AF_ALG -- add sign/verify API
>       crypto: AF_ALG -- add setpubkey setsockopt call
>       crypto: AF_ALG -- add asymmetric cipher interface
>       crypto: algif_akcipher - enable compilation
> 
> Tadeusz Struk (2):
>       crypto: algif_akcipher - add ops_nokey
>       crypto: AF_ALG - add support for key_id
> 
>  crypto/Kconfig              |    9 
>  crypto/Makefile             |    1 
>  crypto/af_alg.c             |   28 +
>  crypto/algif_akcipher.c     |  884 +++++++++++++++++++++++++++++++++++++++++++
>  include/crypto/if_alg.h     |    2 
>  include/uapi/linux/if_alg.h |    5 
>  6 files changed, 924 insertions(+), 5 deletions(-)
>  create mode 100644 crypto/algif_akcipher.c

Hi David,
Are you ok to take it into 4.7 via your linux-fs?
Thanks,
-- 
TS

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