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// SPDX-License-Identifier: GPL-2.0-or-later
/* PKCS#8 Private Key parser [RFC 5208].
*
* Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#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");
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