Merge 'v4.13.8' and 'linux-fs/keys-asym-keyctl'
diff --git a/Documentation/crypto/asymmetric-keys.txt b/Documentation/crypto/asymmetric-keys.txt
index 5969bf4..8763866 100644
--- a/Documentation/crypto/asymmetric-keys.txt
+++ b/Documentation/crypto/asymmetric-keys.txt
@@ -183,6 +183,10 @@
void (*describe)(const struct key *key, struct seq_file *m);
void (*destroy)(void *payload);
+ int (*query)(const struct kernel_pkey_params *params,
+ struct kernel_pkey_query *info);
+ int (*eds_op)(struct kernel_pkey_params *params,
+ const void *in, void *out);
int (*verify_signature)(const struct key *key,
const struct public_key_signature *sig);
};
@@ -207,12 +211,22 @@
asymmetric key will look after freeing the fingerprint and releasing the
reference on the subtype module.
- (3) verify_signature().
+ (3) query().
- Optional. These are the entry points for the key usage operations.
- Currently there is only the one defined. If not set, the caller will be
- given -ENOTSUPP. The subtype may do anything it likes to implement an
- operation, including offloading to hardware.
+ Mandatory. This is a function for querying the capabilities of a key.
+
+ (4) eds_op().
+
+ Optional. This is the entry point for the encryption, decryption and
+ signature creation operations (which are distinguished by the operation ID
+ in the parameter struct). The subtype may do anything it likes to
+ implement an operation, including offloading to hardware.
+
+ (5) verify_signature().
+
+ Optional. This is the entry point for signature verification. The
+ subtype may do anything it likes to implement an operation, including
+ offloading to hardware.
==========================
@@ -234,6 +248,8 @@
- X.509 ASN.1 stream.
- Pointer to TPM key.
- Pointer to UEFI key.
+ - PKCS#8 private key [RFC 5208].
+ - PKCS#5 encrypted private key [RFC 2898].
During key instantiation each parser in the list is tried until one doesn't
return -EBADMSG.
diff --git a/Documentation/security/keys/core.rst b/Documentation/security/keys/core.rst
index 1648fa8..8338093 100644
--- a/Documentation/security/keys/core.rst
+++ b/Documentation/security/keys/core.rst
@@ -869,6 +869,112 @@
and either the buffer length or the OtherInfo length exceeds the
allowed length.
+
+ * Query an asymmetric key::
+
+ long keyctl(KEYCTL_PKEY_QUERY, key_serial_t key_id,
+ unsigned long reserved, struct keyctl_pkey_query *info);
+
+ Get information about an asymmetric key. The information is returned in
+ the keyctl_pkey_query struct:
+
+ - ``__u32 supported_ops`` is a bit mask of flags indicating
+ which ops are supported. This is constructed from a
+ bitwise-OR of ``KEYCTL_SUPPORTS_{ENCRYPT,DECRYPT,SIGN,VERIFY}``
+
+ - ``__u32 key_size`` is the size in bits of the key.
+
+ - ``__u16 max_data_size`` is the maximum size in bytes of a blob
+ of data to be signed
+ - ``__u16 max_sig_size`` is the maximum size in bytes of a
+ signature blob
+ - ``__u16 max_enc_size`` is the maximum size in bytes of a blob
+ to be encrypted
+ - ``__u16 max_dec_size`` is the maximum size in bytes of a blob
+ to be decrypted.
+
+ ``reserved`` must be set to 0. This is intended for future use to
+ hand over one or more passphrases needed unlock a key.
+
+ If successful, 0 is returned. If the key is not an asymmetric key,
+ EOPNOTSUPP is returned.
+
+
+ * Encrypt, decrypt, sign or verify a blob using an asymmetric key::
+
+ long keyctl(KEYCTL_PKEY_ENCRYPT,
+ const struct keyctl_pkey_params *params,
+ const char *info,
+ const void *in,
+ void *out);
+
+ long keyctl(KEYCTL_PKEY_DECRYPT,
+ const struct keyctl_pkey_params *params,
+ const char *info,
+ const void *in,
+ void *out);
+
+ long keyctl(KEYCTL_PKEY_SIGN,
+ const struct keyctl_pkey_params *params,
+ const char *info,
+ const void *in,
+ void *out);
+
+ long keyctl(KEYCTL_PKEY_VERIFY,
+ const struct keyctl_pkey_params *params,
+ const char *info,
+ const void *in,
+ const void *in2);
+
+ Use an asymmetric key to perform a public-key cryptographic operation a
+ blob of data. For encryption and verification, the asymmetric key may
+ only need the public parts to be available, but for decryption and signing
+ the private parts are required also.
+
+ The parameter block pointed to by params contains a number of integer
+ values::
+
+ __s32 key_id;
+ __u32 in_len;
+ __u32 out_len;
+ __u32 in2_len;
+
+ ``key_id`` is the ID of the asymmetric key to be used. in_len and
+ in2_len indicate the amount of data in the in and in2 buffers and out_len
+ indicates the size of the out buffer as appropriate for the above
+ operations.
+
+ For a given operation, the in and out buffers are used as follows::
+
+ Operation ID in,in_len out,out_len in2,in2_len
+ ======================= =============== =============== ===============
+ KEYCTL_PKEY_ENCRYPT Raw data Encrypted data -
+ KEYCTL_PKEY_DECRYPT Encrypted data Raw data -
+ KEYCTL_PKEY_SIGN Raw data Signature -
+ KEYCTL_PKEY_VERIFY Raw data - Signature
+
+ info is a string of key=value pairs that supply supplementary information.
+ These include::
+
+ enc=<encoding> The encoding of the encrypted/signature blob. This can
+ be "pkcs1" for RSASSA-PKCS1-v1.5 or RSAES-PKCS1-v1.5;
+ "pss" for "RSASSA-PSS"; "oaep" for "RSAES-OAEP". If
+ omitted or is "raw", the raw output of the encryption
+ function is specified.
+
+ hash=<algo> If the data buffer contains the output of a hash
+ function and the encoding includes some indication of
+ which hash function was used, the hash function can be
+ specified with this, eg. "hash=sha256".
+
+ The ``__spare`` space in the parameter block must be set to 0. This is
+ intended, amongst other things, to allow the passing of passphrases
+ required to unlock a key.
+
+ If successful, encrypt, decrypt and sign all return the amount of data
+ written into the output buffer. Verification returns 0 on success.
+
+
* Restrict keyring linkage::
long keyctl(KEYCTL_RESTRICT_KEYRING, key_serial_t keyring,
@@ -1484,6 +1590,112 @@
The authorisation key.
+ * ``int (*asym_eds_op)(struct kernel_pkey_params *params,
+ const void *in, void *out);
+ int (*asym_verify_signature)(struct kernel_pkey_params *params,
+ const void *in, const void *in2);``
+
+ These methods are optional. If provided the first allows a key to be
+ used to encrypt, decrypt or sign a blob of data, and the second allows a
+ key to verify a signature.
+
+ In all cases, the following information is provided in the params block::
+
+ struct kernel_pkey_params {
+ struct key *key;
+ const char *encoding;
+ const char *hash_algo;
+ char *info;
+ __u32 in_len;
+ union {
+ __u32 out_len;
+ __u32 in2_len;
+ };
+ enum kernel_pkey_operation op : 8;
+ };
+
+ This includes the key to be used; an optional string indicating the
+ encoding to use (for instance, "pkcs1" may be used with an RSA key to
+ indicate RSASSA-PKCS1-v1.5 or RSAES-PKCS1-v1.5 encoding); the name of the
+ hash algorithm used to generate the data for a signature (if appropriate);
+ the sizes of the input and output (or second input) buffers; and the ID of
+ the operation to be performed.
+
+ For a given operation ID, the input and output buffers are used as
+ follows:
+
+ Operation ID in,in_len out,out_len in2,in2_len
+ ======================= =============== =============== ===============
+ kernel_pkey_encrypt Raw data Encrypted data -
+ kernel_pkey_decrypt Encrypted data Raw data -
+ kernel_pkey_sign Raw data Signature -
+ kernel_pkey_verify Raw data - Signature
+
+ asym_eds_op() deals with encryption, decryption and signature creation as
+ specified by params->op. Note that params->op is also set for
+ asym_verify_signature().
+
+ Encrypting and signature creation both take raw data in the input buffer
+ and return the encrypted result in the output buffer. Padding may have
+ been added if an encoding was set. In the case of signature creation,
+ depending on the encoding, the padding created may need to indicate the
+ digest algorithm - the name of which should be supplied in hash_algo.
+
+ Decryption takes encrypted data in the input buffer and returns the raw
+ data in the output buffer. Padding will get checked and stripped off if
+ an encoding was set.
+
+ Verification takes raw data in the input buffer and the signature in the
+ second input buffer and checks that the one matches the other. Padding
+ will be validated. Depending on the encoding, the digest algorithm used
+ to generate the raw data may need to be indicated in hash_algo.
+
+ If successful, asym_eds_op() should return the number of bytes written
+ into the output buffer. asym_verify_signature() should return 0.
+
+ A variety of errors may be returned, including EOPNOTSUPP if the operation
+ is not supported; EKEYREJECTED if verification fails; ENOPKG if the
+ required crypto isn't available.
+
+
+ * ``int (*asym_query)(const struct kernel_pkey_params *params,
+ struct kernel_pkey_query *info);``
+
+ This method is optional. If provided it allows information about the
+ public or asymmetric key held in the key to be determined.
+
+ The parameter block is as for asym_eds_op() and co. but in_len and out_len
+ are unused. The encoding and hash_algo fields should be used to reduce
+ the returned buffer/data sizes as appropriate.
+
+ If successful, the following information is filled in::
+
+ struct kernel_pkey_query {
+ __u32 supported_ops;
+ __u32 key_size;
+ __u16 max_data_size;
+ __u16 max_sig_size;
+ __u16 max_enc_size;
+ __u16 max_dec_size;
+ };
+
+ The supported_ops field will contain a bitmask indicating what operations
+ are supported by the key, including encryption of a blob, decryption of a
+ blob, signing a blob and verifying the signature on a blob. The following
+ constants are defined for this:
+
+ KEYCTL_SUPPORTS_{ENCRYPT,DECRYPT,SIGN,VERIFY}
+
+ The key_size field is the size of the key in bits. max_data_size and
+ max_sig_size are the maximum raw data and signature sizes for creation and
+ verification of a signature; max_enc_size and max_dec_size are the maximum
+ raw data and signature sizes for encryption and decryption. The
+ max_*_size fields are measured in bytes.
+
+ If successful, 0 will be returned. If the key doesn't support this,
+ EOPNOTSUPP will be returned.
+
+
* ``struct key_restriction *(*lookup_restriction)(const char *params);``
This optional method is used to enable userspace configuration of keyring
diff --git a/crypto/asymmetric_keys/Kconfig b/crypto/asymmetric_keys/Kconfig
index 331f6ba..338fbed 100644
--- a/crypto/asymmetric_keys/Kconfig
+++ b/crypto/asymmetric_keys/Kconfig
@@ -30,6 +30,16 @@
data and provides the ability to instantiate a crypto key from a
public key packet found inside the certificate.
+config PKCS8_PRIVATE_KEY_PARSER
+ tristate "PKCS#8 private key parser"
+ depends on ASYMMETRIC_PUBLIC_KEY_SUBTYPE
+ select ASN1
+ select OID_REGISTRY
+ help
+ This option provides support for parsing PKCS#8 format blobs for
+ private key data and provides the ability to instantiate a crypto key
+ from that data.
+
config PKCS7_MESSAGE_PARSER
tristate "PKCS#7 message parser"
depends on X509_CERTIFICATE_PARSER
diff --git a/crypto/asymmetric_keys/Makefile b/crypto/asymmetric_keys/Makefile
index 6516855..ac87757 100644
--- a/crypto/asymmetric_keys/Makefile
+++ b/crypto/asymmetric_keys/Makefile
@@ -32,6 +32,19 @@
clean-files += x509_akid-asn1.c x509_akid-asn1.h
#
+# PKCS#8 private key handling
+#
+obj-$(CONFIG_PKCS8_PRIVATE_KEY_PARSER) += pkcs8_key_parser.o
+pkcs8_key_parser-y := \
+ pkcs8-asn1.o \
+ pkcs8_parser.o
+
+$(obj)/pkcs8_parser.o: $(obj)/pkcs8-asn1.h
+$(obj)/pkcs8-asn1.o: $(obj)/pkcs8-asn1.c $(obj)/pkcs8-asn1.h
+
+clean-files += pkcs8-asn1.c pkcs8-asn1.h
+
+#
# PKCS#7 message handling
#
obj-$(CONFIG_PKCS7_MESSAGE_PARSER) += pkcs7_message.o
diff --git a/crypto/asymmetric_keys/asymmetric_keys.h b/crypto/asymmetric_keys/asymmetric_keys.h
index ca8e9ac..7be1ccf 100644
--- a/crypto/asymmetric_keys/asymmetric_keys.h
+++ b/crypto/asymmetric_keys/asymmetric_keys.h
@@ -16,3 +16,6 @@
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 e4b0ed3..1ea96bd0 100644
--- a/crypto/asymmetric_keys/asymmetric_type.c
+++ b/crypto/asymmetric_keys/asymmetric_type.c
@@ -17,6 +17,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ctype.h>
+#include <keys/user-type.h>
#include <keys/system_keyring.h>
#include "asymmetric_keys.h"
@@ -452,6 +453,45 @@
asymmetric_key_free_kids(kids);
}
+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);
+}
+
static struct key_restriction *asymmetric_restriction_alloc(
key_restrict_link_func_t check,
struct key *key)
@@ -545,6 +585,9 @@
.match_free = asymmetric_key_match_free,
.destroy = asymmetric_key_destroy,
.describe = asymmetric_key_describe,
+ .asym_query = query_asymmetric_key,
+ .asym_eds_op = asymmetric_key_eds_op,
+ .asym_verify_signature = asymmetric_key_verify_signature,
.lookup_restriction = asymmetric_lookup_restriction,
};
EXPORT_SYMBOL_GPL(key_type_asymmetric);
diff --git a/crypto/asymmetric_keys/pkcs7_parser.c b/crypto/asymmetric_keys/pkcs7_parser.c
index af4cd86..5f0c675 100644
--- a/crypto/asymmetric_keys/pkcs7_parser.c
+++ b/crypto/asymmetric_keys/pkcs7_parser.c
@@ -261,6 +261,7 @@
switch (ctx->last_oid) {
case OID_rsaEncryption:
ctx->sinfo->sig->pkey_algo = "rsa";
+ ctx->sinfo->sig->encoding = "pkcs1";
break;
default:
printk("Unsupported pkey algo: %u\n", ctx->last_oid);
diff --git a/crypto/asymmetric_keys/pkcs8.asn1 b/crypto/asymmetric_keys/pkcs8.asn1
new file mode 100644
index 0000000..702c41a
--- /dev/null
+++ b/crypto/asymmetric_keys/pkcs8.asn1
@@ -0,0 +1,24 @@
+--
+-- This is the unencrypted variant
+--
+PrivateKeyInfo ::= SEQUENCE {
+ version Version,
+ privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
+ privateKey PrivateKey,
+ attributes [0] IMPLICIT Attributes OPTIONAL
+}
+
+Version ::= INTEGER ({ pkcs8_note_version })
+
+PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier ({ pkcs8_note_algo })
+
+PrivateKey ::= OCTET STRING ({ pkcs8_note_key })
+
+Attributes ::= SET OF Attribute
+
+Attribute ::= ANY
+
+AlgorithmIdentifier ::= SEQUENCE {
+ algorithm OBJECT IDENTIFIER ({ pkcs8_note_OID }),
+ parameters ANY OPTIONAL
+}
diff --git a/crypto/asymmetric_keys/pkcs8_parser.c b/crypto/asymmetric_keys/pkcs8_parser.c
new file mode 100644
index 0000000..26a73c0
--- /dev/null
+++ b/crypto/asymmetric_keys/pkcs8_parser.c
@@ -0,0 +1,184 @@
+/* PKCS#8 Private Key parser [RFC 5208].
+ *
+ * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) "PKCS8: "fmt
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/oid_registry.h>
+#include <keys/asymmetric-subtype.h>
+#include <keys/asymmetric-parser.h>
+#include <crypto/public_key.h>
+#include "pkcs8-asn1.h"
+
+struct pkcs8_parse_context {
+ struct public_key *pub;
+ unsigned long data; /* Start of data */
+ enum OID last_oid; /* Last OID encountered */
+ enum OID algo_oid; /* Algorithm OID */
+ u32 key_size;
+ const void *key;
+};
+
+/*
+ * Note an OID when we find one for later processing when we know how to
+ * interpret it.
+ */
+int pkcs8_note_OID(void *context, size_t hdrlen,
+ unsigned char tag,
+ const void *value, size_t vlen)
+{
+ struct pkcs8_parse_context *ctx = context;
+
+ ctx->last_oid = look_up_OID(value, vlen);
+ if (ctx->last_oid == OID__NR) {
+ char buffer[50];
+
+ sprint_oid(value, vlen, buffer, sizeof(buffer));
+ pr_info("Unknown OID: [%lu] %s\n",
+ (unsigned long)value - ctx->data, buffer);
+ }
+ return 0;
+}
+
+/*
+ * Note the version number of the ASN.1 blob.
+ */
+int pkcs8_note_version(void *context, size_t hdrlen,
+ unsigned char tag,
+ const void *value, size_t vlen)
+{
+ if (vlen != 1 || ((const u8 *)value)[0] != 0) {
+ pr_warn("Unsupported PKCS#8 version\n");
+ return -EBADMSG;
+ }
+ return 0;
+}
+
+/*
+ * Note the public algorithm.
+ */
+int pkcs8_note_algo(void *context, size_t hdrlen,
+ unsigned char tag,
+ const void *value, size_t vlen)
+{
+ struct pkcs8_parse_context *ctx = context;
+
+ if (ctx->last_oid != OID_rsaEncryption)
+ return -ENOPKG;
+
+ ctx->pub->pkey_algo = "rsa";
+ return 0;
+}
+
+/*
+ * Note the key data of the ASN.1 blob.
+ */
+int pkcs8_note_key(void *context, size_t hdrlen,
+ unsigned char tag,
+ const void *value, size_t vlen)
+{
+ struct pkcs8_parse_context *ctx = context;
+
+ ctx->key = value;
+ ctx->key_size = vlen;
+ return 0;
+}
+
+/*
+ * Parse a PKCS#8 private key blob.
+ */
+static struct public_key *pkcs8_parse(const void *data, size_t datalen)
+{
+ struct pkcs8_parse_context ctx;
+ struct public_key *pub;
+ long ret;
+
+ memset(&ctx, 0, sizeof(ctx));
+
+ ret = -ENOMEM;
+ ctx.pub = kzalloc(sizeof(struct public_key), GFP_KERNEL);
+ if (!ctx.pub)
+ goto error;
+
+ ctx.data = (unsigned long)data;
+
+ /* Attempt to decode the private key */
+ ret = asn1_ber_decoder(&pkcs8_decoder, &ctx, data, datalen);
+ if (ret < 0)
+ goto error_decode;
+
+ ret = -ENOMEM;
+ pub = ctx.pub;
+ pub->key = kmemdup(ctx.key, ctx.key_size, GFP_KERNEL);
+ if (!pub->key)
+ goto error_decode;
+
+ pub->keylen = ctx.key_size;
+ pub->key_is_private = true;
+ return pub;
+
+error_decode:
+ kfree(ctx.pub);
+error:
+ return ERR_PTR(ret);
+}
+
+/*
+ * Attempt to parse a data blob for a key as a PKCS#8 private key.
+ */
+static int pkcs8_key_preparse(struct key_preparsed_payload *prep)
+{
+ struct public_key *pub;
+
+ pub = pkcs8_parse(prep->data, prep->datalen);
+ if (IS_ERR(pub))
+ return PTR_ERR(pub);
+
+ pr_devel("Cert Key Algo: %s\n", pub->pkey_algo);
+ pub->id_type = "PKCS8";
+
+ /* We're pinning the module by being linked against it */
+ __module_get(public_key_subtype.owner);
+ prep->payload.data[asym_subtype] = &public_key_subtype;
+ prep->payload.data[asym_key_ids] = NULL;
+ prep->payload.data[asym_crypto] = pub;
+ prep->payload.data[asym_auth] = NULL;
+ prep->quotalen = 100;
+ return 0;
+}
+
+static struct asymmetric_key_parser pkcs8_key_parser = {
+ .owner = THIS_MODULE,
+ .name = "pkcs8",
+ .parse = pkcs8_key_preparse,
+};
+
+/*
+ * Module stuff
+ */
+static int __init pkcs8_key_init(void)
+{
+ return register_asymmetric_key_parser(&pkcs8_key_parser);
+}
+
+static void __exit pkcs8_key_exit(void)
+{
+ unregister_asymmetric_key_parser(&pkcs8_key_parser);
+}
+
+module_init(pkcs8_key_init);
+module_exit(pkcs8_key_exit);
+
+MODULE_DESCRIPTION("PKCS#8 certificate parser");
+MODULE_LICENSE("GPL");
diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index 3cd6e12..329501b 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -57,12 +57,96 @@
public_key_signature_free(payload3);
}
+/*
+ * Determine the crypto algorithm name.
+ */
+static
+int software_key_determine_akcipher(const char *encoding,
+ const char *hash_algo,
+ const struct public_key *pkey,
+ char alg_name[CRYPTO_MAX_ALG_NAME])
+{
+ int n;
+
+ if (strcmp(encoding, "pkcs1") == 0) {
+ /* The data wangled by the RSA algorithm is typically padded
+ * and encoded in some manner, such as EMSA-PKCS1-1_5 [RFC3447
+ * sec 8.2].
+ */
+ if (!hash_algo)
+ n = snprintf(alg_name, CRYPTO_MAX_ALG_NAME,
+ "pkcs1pad(%s)",
+ pkey->pkey_algo);
+ else
+ n = snprintf(alg_name, CRYPTO_MAX_ALG_NAME,
+ "pkcs1pad(%s,%s)",
+ pkey->pkey_algo, hash_algo);
+ return n >= CRYPTO_MAX_ALG_NAME ? -EINVAL : 0;
+ }
+
+ if (strcmp(encoding, "raw") == 0) {
+ strcpy(alg_name, pkey->pkey_algo);
+ return 0;
+ }
+
+ return -ENOPKG;
+}
+
+/*
+ * Query information about a key.
+ */
+static int software_key_query(const struct kernel_pkey_params *params,
+ struct kernel_pkey_query *info)
+{
+ struct crypto_akcipher *tfm;
+ struct public_key *pkey = params->key->payload.data[asym_crypto];
+ char alg_name[CRYPTO_MAX_ALG_NAME];
+ int ret, len;
+
+ ret = software_key_determine_akcipher(params->encoding,
+ params->hash_algo,
+ pkey, alg_name);
+ if (ret < 0)
+ return ret;
+
+ tfm = crypto_alloc_akcipher(alg_name, 0, 0);
+ if (IS_ERR(tfm))
+ return PTR_ERR(tfm);
+
+ if (pkey->key_is_private)
+ ret = crypto_akcipher_set_priv_key(tfm,
+ pkey->key, pkey->keylen);
+ else
+ ret = crypto_akcipher_set_pub_key(tfm,
+ pkey->key, pkey->keylen);
+ if (ret < 0)
+ goto error_free_tfm;
+
+ len = crypto_akcipher_maxsize(tfm);
+ info->key_size = len * 8;
+ info->max_data_size = len;
+ info->max_sig_size = len;
+ info->max_enc_size = len;
+ info->max_dec_size = len;
+ info->supported_ops = (KEYCTL_SUPPORTS_ENCRYPT |
+ KEYCTL_SUPPORTS_VERIFY);
+ if (pkey->key_is_private)
+ info->supported_ops |= (KEYCTL_SUPPORTS_DECRYPT |
+ KEYCTL_SUPPORTS_SIGN);
+ ret = 0;
+
+error_free_tfm:
+ crypto_free_akcipher(tfm);
+ pr_devel("<==%s() = %d\n", __func__, ret);
+ return ret;
+}
+
struct public_key_completion {
struct completion completion;
int err;
};
-static void public_key_verify_done(struct crypto_async_request *req, int err)
+static void public_key_crypto_done(struct crypto_async_request *req, int err)
{
struct public_key_completion *compl = req->data;
@@ -74,6 +158,84 @@
}
/*
+ * Do encryption, decryption and signing ops.
+ */
+static int software_key_eds_op(struct kernel_pkey_params *params,
+ const void *in, void *out)
+{
+ struct public_key_completion compl;
+ const struct public_key *pkey = params->key->payload.data[asym_crypto];
+ struct akcipher_request *req;
+ struct crypto_akcipher *tfm;
+ struct scatterlist in_sg, out_sg;
+ char alg_name[CRYPTO_MAX_ALG_NAME];
+ int ret;
+
+ pr_devel("==>%s()\n", __func__);
+
+ ret = software_key_determine_akcipher(params->encoding,
+ params->hash_algo,
+ pkey, alg_name);
+ if (ret < 0)
+ return ret;
+
+ tfm = crypto_alloc_akcipher(alg_name, 0, 0);
+ if (IS_ERR(tfm))
+ return PTR_ERR(tfm);
+
+ req = akcipher_request_alloc(tfm, GFP_KERNEL);
+ if (!req)
+ goto error_free_tfm;
+
+ if (pkey->key_is_private)
+ ret = crypto_akcipher_set_priv_key(tfm,
+ pkey->key, pkey->keylen);
+ else
+ ret = crypto_akcipher_set_pub_key(tfm,
+ pkey->key, pkey->keylen);
+ if (ret)
+ goto error_free_req;
+
+ sg_init_one(&in_sg, in, params->in_len);
+ sg_init_one(&out_sg, out, params->out_len);
+ akcipher_request_set_crypt(req, &in_sg, &out_sg, params->in_len,
+ params->out_len);
+ init_completion(&compl.completion);
+ akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG |
+ CRYPTO_TFM_REQ_MAY_SLEEP,
+ public_key_crypto_done, &compl);
+
+ /* Perform the encryption calculation. */
+ switch (params->op) {
+ case kernel_pkey_encrypt:
+ ret = crypto_akcipher_encrypt(req);
+ break;
+ case kernel_pkey_decrypt:
+ ret = crypto_akcipher_decrypt(req);
+ break;
+ case kernel_pkey_sign:
+ ret = crypto_akcipher_sign(req);
+ break;
+ default:
+ BUG();
+ }
+ if (ret == -EINPROGRESS) {
+ wait_for_completion(&compl.completion);
+ ret = compl.err;
+ }
+
+ if (ret == 0)
+ ret = req->dst_len;
+
+error_free_req:
+ akcipher_request_free(req);
+error_free_tfm:
+ crypto_free_akcipher(tfm);
+ pr_devel("<==%s() = %d\n", __func__, ret);
+ return ret;
+}
+
+/*
* Verify a signature using a public key.
*/
int public_key_verify_signature(const struct public_key *pkey,
@@ -83,8 +245,7 @@
struct crypto_akcipher *tfm;
struct akcipher_request *req;
struct scatterlist sig_sg, digest_sg;
- const char *alg_name;
- char alg_name_buf[CRYPTO_MAX_ALG_NAME];
+ char alg_name[CRYPTO_MAX_ALG_NAME];
void *output;
unsigned int outlen;
int ret = -ENOMEM;
@@ -96,18 +257,11 @@
BUG_ON(!sig->digest);
BUG_ON(!sig->s);
- alg_name = sig->pkey_algo;
- if (strcmp(sig->pkey_algo, "rsa") == 0) {
- /* The data wangled by the RSA algorithm is typically padded
- * and encoded in some manner, such as EMSA-PKCS1-1_5 [RFC3447
- * sec 8.2].
- */
- if (snprintf(alg_name_buf, CRYPTO_MAX_ALG_NAME,
- "pkcs1pad(rsa,%s)", sig->hash_algo
- ) >= CRYPTO_MAX_ALG_NAME)
- return -EINVAL;
- alg_name = alg_name_buf;
- }
+ ret = software_key_determine_akcipher(sig->encoding,
+ sig->hash_algo,
+ pkey, alg_name);
+ if (ret < 0)
+ return ret;
tfm = crypto_alloc_akcipher(alg_name, 0, 0);
if (IS_ERR(tfm))
@@ -117,7 +271,12 @@
if (!req)
goto error_free_tfm;
- ret = crypto_akcipher_set_pub_key(tfm, pkey->key, pkey->keylen);
+ if (pkey->key_is_private)
+ ret = crypto_akcipher_set_priv_key(tfm,
+ pkey->key, pkey->keylen);
+ else
+ ret = crypto_akcipher_set_pub_key(tfm,
+ pkey->key, pkey->keylen);
if (ret)
goto error_free_req;
@@ -134,7 +293,7 @@
init_completion(&compl.completion);
akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG |
CRYPTO_TFM_REQ_MAY_SLEEP,
- public_key_verify_done, &compl);
+ public_key_crypto_done, &compl);
/* Perform the verification calculation. This doesn't actually do the
* verification, but rather calculates the hash expected by the
@@ -180,6 +339,8 @@
.name_len = sizeof("public_key") - 1,
.describe = public_key_describe,
.destroy = public_key_destroy,
+ .query = software_key_query,
+ .eds_op = software_key_eds_op,
.verify_signature = public_key_verify_signature_2,
};
EXPORT_SYMBOL_GPL(public_key_subtype);
diff --git a/crypto/asymmetric_keys/signature.c b/crypto/asymmetric_keys/signature.c
index 11b7ba17..78545b4 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 @@
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
diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
index dd03fea..2d58563 100644
--- a/crypto/asymmetric_keys/x509_cert_parser.c
+++ b/crypto/asymmetric_keys/x509_cert_parser.c
@@ -199,35 +199,32 @@
case OID_md4WithRSAEncryption:
ctx->cert->sig->hash_algo = "md4";
- ctx->cert->sig->pkey_algo = "rsa";
- break;
+ goto rsa_pkcs1;
case OID_sha1WithRSAEncryption:
ctx->cert->sig->hash_algo = "sha1";
- ctx->cert->sig->pkey_algo = "rsa";
- break;
+ goto rsa_pkcs1;
case OID_sha256WithRSAEncryption:
ctx->cert->sig->hash_algo = "sha256";
- ctx->cert->sig->pkey_algo = "rsa";
- break;
+ goto rsa_pkcs1;
case OID_sha384WithRSAEncryption:
ctx->cert->sig->hash_algo = "sha384";
- ctx->cert->sig->pkey_algo = "rsa";
- break;
+ goto rsa_pkcs1;
case OID_sha512WithRSAEncryption:
ctx->cert->sig->hash_algo = "sha512";
- ctx->cert->sig->pkey_algo = "rsa";
- break;
+ goto rsa_pkcs1;
case OID_sha224WithRSAEncryption:
ctx->cert->sig->hash_algo = "sha224";
- ctx->cert->sig->pkey_algo = "rsa";
- break;
+ goto rsa_pkcs1;
}
+rsa_pkcs1:
+ ctx->cert->sig->pkey_algo = "rsa";
+ ctx->cert->sig->encoding = "pkcs1";
ctx->algo_oid = ctx->last_oid;
return 0;
}
diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h
index e0b681a..be626ea 100644
--- a/include/crypto/public_key.h
+++ b/include/crypto/public_key.h
@@ -14,6 +14,8 @@
#ifndef _LINUX_PUBLIC_KEY_H
#define _LINUX_PUBLIC_KEY_H
+#include <linux/keyctl.h>
+
/*
* Cryptographic data for the public-key subtype of the asymmetric key type.
*
@@ -23,6 +25,7 @@
struct public_key {
void *key;
u32 keylen;
+ bool key_is_private;
const char *id_type;
const char *pkey_algo;
};
@@ -40,6 +43,7 @@
u8 digest_size; /* Number of bytes in digest */
const char *pkey_algo;
const char *hash_algo;
+ const char *encoding;
};
extern void public_key_signature_free(struct public_key_signature *sig);
@@ -65,8 +69,14 @@
const union key_payload *payload,
struct key *trusted);
-extern int verify_signature(const struct key *key,
- const struct public_key_signature *sig);
+extern int query_asymmetric_key(const struct kernel_pkey_params *,
+ struct kernel_pkey_query *);
+
+extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *);
+extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *);
+extern int create_signature(struct kernel_pkey_params *, const void *, void *);
+extern int verify_signature(const struct key *,
+ const struct public_key_signature *);
int public_key_verify_signature(const struct public_key *pkey,
const struct public_key_signature *sig);
diff --git a/include/keys/asymmetric-subtype.h b/include/keys/asymmetric-subtype.h
index 2480469..bd12733 100644
--- a/include/keys/asymmetric-subtype.h
+++ b/include/keys/asymmetric-subtype.h
@@ -17,6 +17,8 @@
#include <linux/seq_file.h>
#include <keys/asymmetric-type.h>
+struct kernel_pkey_query;
+struct kernel_pkey_params;
struct public_key_signature;
/*
@@ -34,6 +36,13 @@
/* Destroy a key of this subtype */
void (*destroy)(void *payload_crypto, void *payload_auth);
+ int (*query)(const struct kernel_pkey_params *params,
+ struct kernel_pkey_query *info);
+
+ /* Encrypt/decrypt/sign data */
+ int (*eds_op)(struct kernel_pkey_params *params,
+ const void *in, void *out);
+
/* Verify the signature on a key of this subtype (optional) */
int (*verify_signature)(const struct key *key,
const struct public_key_signature *sig);
diff --git a/include/linux/key-type.h b/include/linux/key-type.h
index 9520fc3..c62ec3d 100644
--- a/include/linux/key-type.h
+++ b/include/linux/key-type.h
@@ -17,6 +17,9 @@
#ifdef CONFIG_KEYS
+struct kernel_pkey_query;
+struct kernel_pkey_params;
+
/*
* key under-construction record
* - passed to the request_key actor if supplied
@@ -147,6 +150,13 @@
*/
request_key_actor_t request_key;
+ /* Asymmetric key accessor functions. */
+ int (*asym_query)(const struct kernel_pkey_params *params,
+ struct kernel_pkey_query *info);
+ int (*asym_eds_op)(struct kernel_pkey_params *params,
+ const void *in, void *out);
+ int (*asym_verify_signature)(struct kernel_pkey_params *params,
+ const void *in, const void *in2);
/* Look up a keyring access restriction (optional)
*
* - NULL is a valid return value (meaning the requested restriction
diff --git a/include/linux/keyctl.h b/include/linux/keyctl.h
new file mode 100644
index 0000000..e89b4a4
--- /dev/null
+++ b/include/linux/keyctl.h
@@ -0,0 +1,46 @@
+/* keyctl kernel bits
+ *
+ * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef __LINUX_KEYCTL_H
+#define __LINUX_KEYCTL_H
+
+#include <uapi/linux/keyctl.h>
+
+struct kernel_pkey_query {
+ __u32 supported_ops; /* Which ops are supported */
+ __u32 key_size; /* Size of the key in bits */
+ __u16 max_data_size; /* Maximum size of raw data to sign in bytes */
+ __u16 max_sig_size; /* Maximum size of signature in bytes */
+ __u16 max_enc_size; /* Maximum size of encrypted blob in bytes */
+ __u16 max_dec_size; /* Maximum size of decrypted blob in bytes */
+};
+
+enum kernel_pkey_operation {
+ kernel_pkey_encrypt,
+ kernel_pkey_decrypt,
+ kernel_pkey_sign,
+ kernel_pkey_verify,
+};
+
+struct kernel_pkey_params {
+ struct key *key;
+ const char *encoding; /* Encoding (eg. "oaep" or NULL for raw) */
+ const char *hash_algo; /* Digest algorithm used (eg. "sha1") or NULL if N/A */
+ char *info; /* Modified info string to be released later */
+ __u32 in_len; /* Input data size */
+ union {
+ __u32 out_len; /* Output buffer size (enc/dec/sign) */
+ __u32 in2_len; /* 2nd input data size (verify) */
+ };
+ enum kernel_pkey_operation op : 8;
+};
+
+#endif /* __LINUX_KEYCTL_H */
diff --git a/include/uapi/linux/keyctl.h b/include/uapi/linux/keyctl.h
index ef16df0..f393c70 100644
--- a/include/uapi/linux/keyctl.h
+++ b/include/uapi/linux/keyctl.h
@@ -60,6 +60,11 @@
#define KEYCTL_INVALIDATE 21 /* invalidate a key */
#define KEYCTL_GET_PERSISTENT 22 /* get a user's persistent keyring */
#define KEYCTL_DH_COMPUTE 23 /* Compute Diffie-Hellman values */
+#define KEYCTL_PKEY_QUERY 24 /* Query public key parameters */
+#define KEYCTL_PKEY_ENCRYPT 25 /* Encrypt a blob using a public key */
+#define KEYCTL_PKEY_DECRYPT 26 /* Decrypt a blob using a public key */
+#define KEYCTL_PKEY_SIGN 27 /* Create a public key signature */
+#define KEYCTL_PKEY_VERIFY 28 /* Verify a public key signature */
#define KEYCTL_RESTRICT_KEYRING 29 /* Restrict keys allowed to link to a keyring */
/* keyctl structures */
@@ -69,6 +74,31 @@
__s32 base;
};
+#define KEYCTL_SUPPORTS_ENCRYPT 0x01
+#define KEYCTL_SUPPORTS_DECRYPT 0x02
+#define KEYCTL_SUPPORTS_SIGN 0x04
+#define KEYCTL_SUPPORTS_VERIFY 0x08
+
+struct keyctl_pkey_query {
+ __u32 supported_ops; /* Which ops are supported */
+ __u32 key_size; /* Size of the key in bits */
+ __u16 max_data_size; /* Maximum size of raw data to sign in bytes */
+ __u16 max_sig_size; /* Maximum size of signature in bytes */
+ __u16 max_enc_size; /* Maximum size of encrypted blob in bytes */
+ __u16 max_dec_size; /* Maximum size of decrypted blob in bytes */
+ __u32 __spare[10];
+};
+
+struct keyctl_pkey_params {
+ __s32 key_id; /* Serial no. of public key to use */
+ __u32 in_len; /* Input data size */
+ union {
+ __u32 out_len; /* Output buffer size (encrypt/decrypt/sign) */
+ __u32 in2_len; /* 2nd input data size (verify) */
+ };
+ __u32 __spare[7];
+};
+
struct keyctl_kdf_params {
char __user *hashname;
char __user *otherinfo;
diff --git a/security/keys/Makefile b/security/keys/Makefile
index 57dff0c..d17586f 100644
--- a/security/keys/Makefile
+++ b/security/keys/Makefile
@@ -21,6 +21,7 @@
obj-$(CONFIG_SYSCTL) += sysctl.o
obj-$(CONFIG_PERSISTENT_KEYRINGS) += persistent.o
obj-$(CONFIG_KEY_DH_OPERATIONS) += dh.o
+obj-$(CONFIG_ASYMMETRIC_KEY_TYPE) += keyctl_pkey.o
#
# Key types
diff --git a/security/keys/compat.c b/security/keys/compat.c
index e87c89c..9482df60 100644
--- a/security/keys/compat.c
+++ b/security/keys/compat.c
@@ -141,6 +141,24 @@
return keyctl_restrict_keyring(arg2, compat_ptr(arg3),
compat_ptr(arg4));
+ case KEYCTL_PKEY_QUERY:
+ if (arg3 != 0)
+ return -EINVAL;
+ return keyctl_pkey_query(arg2,
+ compat_ptr(arg4),
+ compat_ptr(arg5));
+
+ case KEYCTL_PKEY_ENCRYPT:
+ case KEYCTL_PKEY_DECRYPT:
+ case KEYCTL_PKEY_SIGN:
+ return keyctl_pkey_e_d_s(option,
+ compat_ptr(arg2), compat_ptr(arg3),
+ compat_ptr(arg4), compat_ptr(arg5));
+
+ case KEYCTL_PKEY_VERIFY:
+ return keyctl_pkey_verify(compat_ptr(arg2), compat_ptr(arg3),
+ compat_ptr(arg4), compat_ptr(arg5));
+
default:
return -EOPNOTSUPP;
}
diff --git a/security/keys/internal.h b/security/keys/internal.h
index 503adba..e07db5c 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -298,6 +298,45 @@
#endif
#endif
+#ifdef CONFIG_ASYMMETRIC_KEY_TYPE
+extern long keyctl_pkey_query(key_serial_t,
+ const char __user *,
+ struct keyctl_pkey_query __user *);
+
+extern long keyctl_pkey_verify(const struct keyctl_pkey_params __user *,
+ const char __user *,
+ const void __user *, const void __user *);
+
+extern long keyctl_pkey_e_d_s(int,
+ const struct keyctl_pkey_params __user *,
+ const char __user *,
+ const void __user *, void __user *);
+#else
+static inline long keyctl_pkey_query(key_serial_t id,
+ const char __user *_info,
+ struct keyctl_pkey_query __user *_res)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline long keyctl_pkey_verify(const struct keyctl_pkey_params __user *params,
+ const char __user *_info,
+ const void __user *_in,
+ const void __user *_in2)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline long keyctl_pkey_e_d_s(int op,
+ const struct keyctl_pkey_params __user *params,
+ const char __user *_info,
+ const void __user *_in,
+ void __user *_out)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
/*
* Debugging key validation
*/
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 6a82090..43693b7 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1754,6 +1754,30 @@
(const char __user *) arg3,
(const char __user *) arg4);
+ case KEYCTL_PKEY_QUERY:
+ if (arg3 != 0)
+ return -EINVAL;
+ return keyctl_pkey_query((key_serial_t)arg2,
+ (const char __user *)arg4,
+ (struct keyctl_pkey_query *)arg5);
+
+ case KEYCTL_PKEY_ENCRYPT:
+ case KEYCTL_PKEY_DECRYPT:
+ case KEYCTL_PKEY_SIGN:
+ return keyctl_pkey_e_d_s(
+ option,
+ (const struct keyctl_pkey_params __user *)arg2,
+ (const char __user *)arg3,
+ (const void __user *)arg4,
+ (void __user *)arg5);
+
+ case KEYCTL_PKEY_VERIFY:
+ return keyctl_pkey_verify(
+ (const struct keyctl_pkey_params __user *)arg2,
+ (const char __user *)arg3,
+ (const void __user *)arg4,
+ (const void __user *)arg5);
+
default:
return -EOPNOTSUPP;
}
diff --git a/security/keys/keyctl_pkey.c b/security/keys/keyctl_pkey.c
new file mode 100644
index 0000000..7839788
--- /dev/null
+++ b/security/keys/keyctl_pkey.c
@@ -0,0 +1,323 @@
+/* Public-key operation keyctls
+ *
+ * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/key.h>
+#include <linux/keyctl.h>
+#include <linux/parser.h>
+#include <linux/uaccess.h>
+#include <keys/user-type.h>
+#include "internal.h"
+
+static void keyctl_pkey_params_free(struct kernel_pkey_params *params)
+{
+ kfree(params->info);
+ key_put(params->key);
+}
+
+enum {
+ Opt_err = -1,
+ Opt_enc, /* "enc=<encoding>" eg. "enc=oaep" */
+ Opt_hash, /* "hash=<digest-name>" eg. "hash=sha1" */
+};
+
+static const match_table_t param_keys = {
+ { Opt_enc, "enc=%s" },
+ { Opt_hash, "hash=%s" },
+ { Opt_err, NULL }
+};
+
+/*
+ * Parse the information string which consists of key=val pairs.
+ */
+static int keyctl_pkey_params_parse(struct kernel_pkey_params *params)
+{
+ unsigned long token_mask = 0;
+ substring_t args[MAX_OPT_ARGS];
+ char *c = params->info, *p, *q;
+ int token;
+
+ while ((p = strsep(&c, " \t"))) {
+ if (*p == '\0' || *p == ' ' || *p == '\t')
+ continue;
+ token = match_token(p, param_keys, args);
+ if (__test_and_set_bit(token, &token_mask))
+ return -EINVAL;
+ q = args[0].from;
+ if (!q[0])
+ return -EINVAL;
+
+ switch (token) {
+ case Opt_enc:
+ params->encoding = q;
+ break;
+
+ case Opt_hash:
+ params->hash_algo = q;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Interpret parameters. Callers must always call the free function
+ * on params, even if an error is returned.
+ */
+static int keyctl_pkey_params_get(key_serial_t id,
+ const char __user *_info,
+ struct kernel_pkey_params *params)
+{
+ key_ref_t key_ref;
+ void *p;
+ int ret;
+
+ memset(params, 0, sizeof(*params));
+ params->encoding = "raw";
+
+ p = strndup_user(_info, PAGE_SIZE);
+ if (IS_ERR(p))
+ return PTR_ERR(p);
+ params->info = p;
+
+ ret = keyctl_pkey_params_parse(params);
+ if (ret < 0)
+ return ret;
+
+ key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH);
+ if (IS_ERR(key_ref))
+ return PTR_ERR(key_ref);
+ params->key = key_ref_to_ptr(key_ref);
+
+ if (!params->key->type->asym_query)
+ return -EOPNOTSUPP;
+
+ return 0;
+}
+
+/*
+ * Get parameters from userspace. Callers must always call the free function
+ * on params, even if an error is returned.
+ */
+static int keyctl_pkey_params_get_2(const struct keyctl_pkey_params __user *_params,
+ const char __user *_info,
+ int op,
+ struct kernel_pkey_params *params)
+{
+ struct keyctl_pkey_params uparams;
+ struct kernel_pkey_query info;
+ int ret;
+
+ memset(params, 0, sizeof(*params));
+ params->encoding = "raw";
+
+ if (copy_from_user(&uparams, _params, sizeof(uparams)) != 0)
+ return -EFAULT;
+
+ ret = keyctl_pkey_params_get(uparams.key_id, _info, params);
+ if (ret < 0)
+ return ret;
+
+ ret = params->key->type->asym_query(params, &info);
+ if (ret < 0)
+ return ret;
+
+ switch (op) {
+ case KEYCTL_PKEY_ENCRYPT:
+ case KEYCTL_PKEY_DECRYPT:
+ if (uparams.in_len > info.max_enc_size ||
+ uparams.out_len > info.max_dec_size)
+ return -EINVAL;
+ break;
+ case KEYCTL_PKEY_SIGN:
+ case KEYCTL_PKEY_VERIFY:
+ if (uparams.in_len > info.max_sig_size ||
+ uparams.out_len > info.max_data_size)
+ return -EINVAL;
+ break;
+ default:
+ BUG();
+ }
+
+ params->in_len = uparams.in_len;
+ params->out_len = uparams.out_len;
+ return 0;
+}
+
+/*
+ * Query information about an asymmetric key.
+ */
+long keyctl_pkey_query(key_serial_t id,
+ const char __user *_info,
+ struct keyctl_pkey_query __user *_res)
+{
+ struct kernel_pkey_params params;
+ struct kernel_pkey_query res;
+ long ret;
+
+ memset(¶ms, 0, sizeof(params));
+
+ ret = keyctl_pkey_params_get(id, _info, ¶ms);
+ if (ret < 0)
+ goto error;
+
+ ret = params.key->type->asym_query(¶ms, &res);
+ if (ret < 0)
+ goto error;
+
+ ret = -EFAULT;
+ if (copy_to_user(_res, &res, sizeof(res)) == 0 &&
+ clear_user(_res->__spare, sizeof(_res->__spare)) == 0)
+ ret = 0;
+
+error:
+ keyctl_pkey_params_free(¶ms);
+ return ret;
+}
+
+/*
+ * Encrypt/decrypt/sign
+ *
+ * Encrypt data, decrypt data or sign data using a public key.
+ *
+ * _info is a string of supplementary information in key=val format. For
+ * instance, it might contain:
+ *
+ * "enc=pkcs1 hash=sha256"
+ *
+ * where enc= specifies the encoding and hash= selects the OID to go in that
+ * particular encoding if required. If enc= isn't supplied, it's assumed that
+ * the caller is supplying raw values.
+ *
+ * If successful, the amount of data written into the output buffer is
+ * returned.
+ */
+long keyctl_pkey_e_d_s(int op,
+ const struct keyctl_pkey_params __user *_params,
+ const char __user *_info,
+ const void __user *_in,
+ void __user *_out)
+{
+ struct kernel_pkey_params params;
+ void *in, *out;
+ long ret;
+
+ ret = keyctl_pkey_params_get_2(_params, _info, op, ¶ms);
+ if (ret < 0)
+ goto error_params;
+
+ ret = -EOPNOTSUPP;
+ if (!params.key->type->asym_eds_op)
+ goto error_params;
+
+ switch (op) {
+ case KEYCTL_PKEY_ENCRYPT:
+ params.op = kernel_pkey_encrypt;
+ break;
+ case KEYCTL_PKEY_DECRYPT:
+ params.op = kernel_pkey_decrypt;
+ break;
+ case KEYCTL_PKEY_SIGN:
+ params.op = kernel_pkey_sign;
+ break;
+ default:
+ BUG();
+ }
+
+ in = memdup_user(_in, params.in_len);
+ if (IS_ERR(in)) {
+ ret = PTR_ERR(in);
+ goto error_params;
+ }
+
+ ret = -ENOMEM;
+ out = kmalloc(params.out_len, GFP_KERNEL);
+ if (!out)
+ goto error_in;
+
+ ret = params.key->type->asym_eds_op(¶ms, in, out);
+ if (ret < 0)
+ goto error_out;
+
+ if (copy_to_user(_out, out, ret) != 0)
+ ret = -EFAULT;
+
+error_out:
+ kfree(out);
+error_in:
+ kfree(in);
+error_params:
+ keyctl_pkey_params_free(¶ms);
+ return ret;
+}
+
+/*
+ * Verify a signature.
+ *
+ * Verify a public key signature using the given key, or if not given, search
+ * for a matching key.
+ *
+ * _info is a string of supplementary information in key=val format. For
+ * instance, it might contain:
+ *
+ * "enc=pkcs1 hash=sha256"
+ *
+ * where enc= specifies the signature blob encoding and hash= selects the OID
+ * to go in that particular encoding. If enc= isn't supplied, it's assumed
+ * that the caller is supplying raw values.
+ *
+ * If successful, 0 is returned.
+ */
+long keyctl_pkey_verify(const struct keyctl_pkey_params __user *_params,
+ const char __user *_info,
+ const void __user *_in,
+ const void __user *_in2)
+{
+ struct kernel_pkey_params params;
+ void *in, *in2;
+ long ret;
+
+ ret = keyctl_pkey_params_get_2(_params, _info, KEYCTL_PKEY_VERIFY,
+ ¶ms);
+ if (ret < 0)
+ goto error_params;
+
+ ret = -EOPNOTSUPP;
+ if (!params.key->type->asym_verify_signature)
+ goto error_params;
+
+ in = memdup_user(_in, params.in_len);
+ if (IS_ERR(in)) {
+ ret = PTR_ERR(in);
+ goto error_params;
+ }
+
+ in2 = memdup_user(_in2, params.in2_len);
+ if (IS_ERR(in2)) {
+ ret = PTR_ERR(in2);
+ goto error_in;
+ }
+
+ params.op = kernel_pkey_verify;
+ ret = params.key->type->asym_verify_signature(¶ms, in, in2);
+
+ kfree(in2);
+error_in:
+ kfree(in);
+error_params:
+ keyctl_pkey_params_free(¶ms);
+ return ret;
+}
