linux-stable/crypto/asymmetric_keys/pkcs8_parser.c
Thomas Gleixner b4d0d230cc treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 114 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520170857.552531963@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:27:11 +02:00

180 lines
3.9 KiB
C

// 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");