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authorDavid Howells <dhowells@redhat.com>2018-10-09 17:47:07 +0100
committerJames Morris <james.morris@microsoft.com>2018-10-26 09:30:46 +0100
commit5a30771832aab228e0863e414f9182f86797429e (patch)
treea1b1ebd8134f0c0d853d3102f1212f2601a53789 /crypto
parent00d60fd3b93219ea854220f0fd264b86398cbc53 (diff)
downloadlinux-stericsson-5a30771832aab228e0863e414f9182f86797429e.tar.gz
KEYS: Provide missing asymmetric key subops for new key type ops [ver #2]
Provide the missing asymmetric key subops for new key type ops. This include query, encrypt, decrypt and create signature. Verify signature already exists. Also provided are accessor functions for this: int query_asymmetric_key(const struct key *key, struct kernel_pkey_query *info); int encrypt_blob(struct kernel_pkey_params *params, const void *data, void *enc); int decrypt_blob(struct kernel_pkey_params *params, const void *enc, void *data); int create_signature(struct kernel_pkey_params *params, const void *data, void *enc); The public_key_signature struct gains an encoding field to carry the encoding for verify_signature(). Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Marcel Holtmann <marcel@holtmann.org> Reviewed-by: Marcel Holtmann <marcel@holtmann.org> Reviewed-by: Denis Kenzior <denkenz@gmail.com> Tested-by: Denis Kenzior <denkenz@gmail.com> Signed-off-by: James Morris <james.morris@microsoft.com>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/asymmetric_keys/asymmetric_keys.h3
-rw-r--r--crypto/asymmetric_keys/asymmetric_type.c43
-rw-r--r--crypto/asymmetric_keys/signature.c95
3 files changed, 141 insertions, 0 deletions
diff --git a/crypto/asymmetric_keys/asymmetric_keys.h b/crypto/asymmetric_keys/asymmetric_keys.h
index ca8e9ac34ce6..7be1ccf4fa9f 100644
--- a/crypto/asymmetric_keys/asymmetric_keys.h
+++ b/crypto/asymmetric_keys/asymmetric_keys.h
@@ -16,3 +16,6 @@ extern struct asymmetric_key_id *asymmetric_key_hex_to_key_id(const char *id);
extern int __asymmetric_key_hex_to_key_id(const char *id,
struct asymmetric_key_id *match_id,
size_t hexlen);
+
+extern int asymmetric_key_eds_op(struct kernel_pkey_params *params,
+ const void *in, void *out);
diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_keys/asymmetric_type.c
index 26539e9a8bda..69a0788a7de5 100644
--- a/crypto/asymmetric_keys/asymmetric_type.c
+++ b/crypto/asymmetric_keys/asymmetric_type.c
@@ -18,6 +18,7 @@
#include <linux/slab.h>
#include <linux/ctype.h>
#include <keys/system_keyring.h>
+#include <keys/user-type.h>
#include "asymmetric_keys.h"
MODULE_LICENSE("GPL");
@@ -538,6 +539,45 @@ out:
return ret;
}
+int asymmetric_key_eds_op(struct kernel_pkey_params *params,
+ const void *in, void *out)
+{
+ const struct asymmetric_key_subtype *subtype;
+ struct key *key = params->key;
+ int ret;
+
+ pr_devel("==>%s()\n", __func__);
+
+ if (key->type != &key_type_asymmetric)
+ return -EINVAL;
+ subtype = asymmetric_key_subtype(key);
+ if (!subtype ||
+ !key->payload.data[0])
+ return -EINVAL;
+ if (!subtype->eds_op)
+ return -ENOTSUPP;
+
+ ret = subtype->eds_op(params, in, out);
+
+ pr_devel("<==%s() = %d\n", __func__, ret);
+ return ret;
+}
+
+static int asymmetric_key_verify_signature(struct kernel_pkey_params *params,
+ const void *in, const void *in2)
+{
+ struct public_key_signature sig = {
+ .s_size = params->in2_len,
+ .digest_size = params->in_len,
+ .encoding = params->encoding,
+ .hash_algo = params->hash_algo,
+ .digest = (void *)in,
+ .s = (void *)in2,
+ };
+
+ return verify_signature(params->key, &sig);
+}
+
struct key_type key_type_asymmetric = {
.name = "asymmetric",
.preparse = asymmetric_key_preparse,
@@ -548,6 +588,9 @@ struct key_type key_type_asymmetric = {
.destroy = asymmetric_key_destroy,
.describe = asymmetric_key_describe,
.lookup_restriction = asymmetric_lookup_restriction,
+ .asym_query = query_asymmetric_key,
+ .asym_eds_op = asymmetric_key_eds_op,
+ .asym_verify_signature = asymmetric_key_verify_signature,
};
EXPORT_SYMBOL_GPL(key_type_asymmetric);
diff --git a/crypto/asymmetric_keys/signature.c b/crypto/asymmetric_keys/signature.c
index 28198314bc39..ad95a58c6642 100644
--- a/crypto/asymmetric_keys/signature.c
+++ b/crypto/asymmetric_keys/signature.c
@@ -16,7 +16,9 @@
#include <linux/export.h>
#include <linux/err.h>
#include <linux/slab.h>
+#include <linux/keyctl.h>
#include <crypto/public_key.h>
+#include <keys/user-type.h>
#include "asymmetric_keys.h"
/*
@@ -37,6 +39,99 @@ void public_key_signature_free(struct public_key_signature *sig)
EXPORT_SYMBOL_GPL(public_key_signature_free);
/**
+ * query_asymmetric_key - Get information about an aymmetric key.
+ * @params: Various parameters.
+ * @info: Where to put the information.
+ */
+int query_asymmetric_key(const struct kernel_pkey_params *params,
+ struct kernel_pkey_query *info)
+{
+ const struct asymmetric_key_subtype *subtype;
+ struct key *key = params->key;
+ int ret;
+
+ pr_devel("==>%s()\n", __func__);
+
+ if (key->type != &key_type_asymmetric)
+ return -EINVAL;
+ subtype = asymmetric_key_subtype(key);
+ if (!subtype ||
+ !key->payload.data[0])
+ return -EINVAL;
+ if (!subtype->query)
+ return -ENOTSUPP;
+
+ ret = subtype->query(params, info);
+
+ pr_devel("<==%s() = %d\n", __func__, ret);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(query_asymmetric_key);
+
+/**
+ * encrypt_blob - Encrypt data using an asymmetric key
+ * @params: Various parameters
+ * @data: Data blob to be encrypted, length params->data_len
+ * @enc: Encrypted data buffer, length params->enc_len
+ *
+ * Encrypt the specified data blob using the private key specified by
+ * params->key. The encrypted data is wrapped in an encoding if
+ * params->encoding is specified (eg. "pkcs1").
+ *
+ * Returns the length of the data placed in the encrypted data buffer or an
+ * error.
+ */
+int encrypt_blob(struct kernel_pkey_params *params,
+ const void *data, void *enc)
+{
+ params->op = kernel_pkey_encrypt;
+ return asymmetric_key_eds_op(params, data, enc);
+}
+EXPORT_SYMBOL_GPL(encrypt_blob);
+
+/**
+ * decrypt_blob - Decrypt data using an asymmetric key
+ * @params: Various parameters
+ * @enc: Encrypted data to be decrypted, length params->enc_len
+ * @data: Decrypted data buffer, length params->data_len
+ *
+ * Decrypt the specified data blob using the private key specified by
+ * params->key. The decrypted data is wrapped in an encoding if
+ * params->encoding is specified (eg. "pkcs1").
+ *
+ * Returns the length of the data placed in the decrypted data buffer or an
+ * error.
+ */
+int decrypt_blob(struct kernel_pkey_params *params,
+ const void *enc, void *data)
+{
+ params->op = kernel_pkey_decrypt;
+ return asymmetric_key_eds_op(params, enc, data);
+}
+EXPORT_SYMBOL_GPL(decrypt_blob);
+
+/**
+ * create_signature - Sign some data using an asymmetric key
+ * @params: Various parameters
+ * @data: Data blob to be signed, length params->data_len
+ * @enc: Signature buffer, length params->enc_len
+ *
+ * Sign the specified data blob using the private key specified by params->key.
+ * The signature is wrapped in an encoding if params->encoding is specified
+ * (eg. "pkcs1"). If the encoding needs to know the digest type, this can be
+ * passed through params->hash_algo (eg. "sha1").
+ *
+ * Returns the length of the data placed in the signature buffer or an error.
+ */
+int create_signature(struct kernel_pkey_params *params,
+ const void *data, void *enc)
+{
+ params->op = kernel_pkey_sign;
+ return asymmetric_key_eds_op(params, data, enc);
+}
+EXPORT_SYMBOL_GPL(create_signature);
+
+/**
* verify_signature - Initiate the use of an asymmetric key to verify a signature
* @key: The asymmetric key to verify against
* @sig: The signature to check