2014-07-01 19:02:52 +04:00
|
|
|
/* Parse a Microsoft Individual Code Signing blob
|
|
|
|
*
|
|
|
|
* Copyright (C) 2014 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) "MSCODE: "fmt
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/err.h>
|
|
|
|
#include <linux/oid_registry.h>
|
|
|
|
#include <crypto/pkcs7.h>
|
|
|
|
#include "verify_pefile.h"
|
2018-03-23 16:04:37 +03:00
|
|
|
#include "mscode.asn1.h"
|
2014-07-01 19:02:52 +04:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Parse a Microsoft Individual Code Signing blob
|
|
|
|
*/
|
2016-04-06 18:14:24 +03:00
|
|
|
int mscode_parse(void *_ctx, const void *content_data, size_t data_len,
|
|
|
|
size_t asn1hdrlen)
|
2014-07-01 19:02:52 +04:00
|
|
|
{
|
2016-04-06 18:14:24 +03:00
|
|
|
struct pefile_context *ctx = _ctx;
|
2014-07-01 19:02:52 +04:00
|
|
|
|
2016-04-06 18:14:24 +03:00
|
|
|
content_data -= asn1hdrlen;
|
|
|
|
data_len += asn1hdrlen;
|
2014-07-01 19:02:52 +04:00
|
|
|
pr_devel("Data: %zu [%*ph]\n", data_len, (unsigned)(data_len),
|
|
|
|
content_data);
|
|
|
|
|
|
|
|
return asn1_ber_decoder(&mscode_decoder, ctx, content_data, data_len);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check the content type OID
|
|
|
|
*/
|
|
|
|
int mscode_note_content_type(void *context, size_t hdrlen,
|
|
|
|
unsigned char tag,
|
|
|
|
const void *value, size_t vlen)
|
|
|
|
{
|
|
|
|
enum OID oid;
|
|
|
|
|
|
|
|
oid = look_up_OID(value, vlen);
|
|
|
|
if (oid == OID__NR) {
|
|
|
|
char buffer[50];
|
|
|
|
|
|
|
|
sprint_oid(value, vlen, buffer, sizeof(buffer));
|
|
|
|
pr_err("Unknown OID: %s\n", buffer);
|
|
|
|
return -EBADMSG;
|
|
|
|
}
|
|
|
|
|
2014-07-08 21:10:46 +04:00
|
|
|
/*
|
|
|
|
* pesign utility had a bug where it was putting
|
|
|
|
* OID_msIndividualSPKeyPurpose instead of OID_msPeImageDataObjId
|
|
|
|
* So allow both OIDs.
|
|
|
|
*/
|
|
|
|
if (oid != OID_msPeImageDataObjId &&
|
|
|
|
oid != OID_msIndividualSPKeyPurpose) {
|
2014-07-01 19:02:52 +04:00
|
|
|
pr_err("Unexpected content type OID %u\n", oid);
|
|
|
|
return -EBADMSG;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Note the digest algorithm OID
|
|
|
|
*/
|
|
|
|
int mscode_note_digest_algo(void *context, size_t hdrlen,
|
|
|
|
unsigned char tag,
|
|
|
|
const void *value, size_t vlen)
|
|
|
|
{
|
|
|
|
struct pefile_context *ctx = context;
|
|
|
|
char buffer[50];
|
|
|
|
enum OID oid;
|
|
|
|
|
|
|
|
oid = look_up_OID(value, vlen);
|
|
|
|
switch (oid) {
|
|
|
|
case OID_md4:
|
2016-03-04 00:49:27 +03:00
|
|
|
ctx->digest_algo = "md4";
|
2014-07-01 19:02:52 +04:00
|
|
|
break;
|
|
|
|
case OID_md5:
|
2016-03-04 00:49:27 +03:00
|
|
|
ctx->digest_algo = "md5";
|
2014-07-01 19:02:52 +04:00
|
|
|
break;
|
|
|
|
case OID_sha1:
|
2016-03-04 00:49:27 +03:00
|
|
|
ctx->digest_algo = "sha1";
|
2014-07-01 19:02:52 +04:00
|
|
|
break;
|
|
|
|
case OID_sha256:
|
2016-03-04 00:49:27 +03:00
|
|
|
ctx->digest_algo = "sha256";
|
2014-07-01 19:02:52 +04:00
|
|
|
break;
|
2015-08-30 18:59:57 +03:00
|
|
|
case OID_sha384:
|
2016-03-04 00:49:27 +03:00
|
|
|
ctx->digest_algo = "sha384";
|
2015-08-30 18:59:57 +03:00
|
|
|
break;
|
|
|
|
case OID_sha512:
|
2016-03-04 00:49:27 +03:00
|
|
|
ctx->digest_algo = "sha512";
|
2015-08-30 18:59:57 +03:00
|
|
|
break;
|
|
|
|
case OID_sha224:
|
2016-03-04 00:49:27 +03:00
|
|
|
ctx->digest_algo = "sha224";
|
2015-08-30 18:59:57 +03:00
|
|
|
break;
|
2014-07-01 19:02:52 +04:00
|
|
|
|
|
|
|
case OID__NR:
|
|
|
|
sprint_oid(value, vlen, buffer, sizeof(buffer));
|
|
|
|
pr_err("Unknown OID: %s\n", buffer);
|
|
|
|
return -EBADMSG;
|
|
|
|
|
|
|
|
default:
|
|
|
|
pr_err("Unsupported content type: %u\n", oid);
|
|
|
|
return -ENOPKG;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Note the digest we're guaranteeing with this certificate
|
|
|
|
*/
|
|
|
|
int mscode_note_digest(void *context, size_t hdrlen,
|
|
|
|
unsigned char tag,
|
|
|
|
const void *value, size_t vlen)
|
|
|
|
{
|
|
|
|
struct pefile_context *ctx = context;
|
|
|
|
|
2016-04-06 18:14:24 +03:00
|
|
|
ctx->digest = kmemdup(value, vlen, GFP_KERNEL);
|
2016-07-18 02:10:47 +03:00
|
|
|
if (!ctx->digest)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
ctx->digest_len = vlen;
|
|
|
|
|
|
|
|
return 0;
|
2014-07-01 19:02:52 +04:00
|
|
|
}
|