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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Parse a Microsoft Individual Code Signing blob
3 *
4 * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#define pr_fmt(fmt) "MSCODE: "fmt
9#include <linux/kernel.h>
10#include <linux/slab.h>
11#include <linux/err.h>
12#include <linux/oid_registry.h>
13#include <crypto/pkcs7.h>
14#include "verify_pefile.h"
15#include "mscode.asn1.h"
16
17/*
18 * Parse a Microsoft Individual Code Signing blob
19 */
20int mscode_parse(void *_ctx, const void *content_data, size_t data_len,
21 size_t asn1hdrlen)
22{
23 struct pefile_context *ctx = _ctx;
24
25 content_data -= asn1hdrlen;
26 data_len += asn1hdrlen;
27 pr_devel("Data: %zu [%*ph]\n", data_len, (unsigned)(data_len),
28 content_data);
29
30 return asn1_ber_decoder(&mscode_decoder, ctx, content_data, data_len);
31}
32
33/*
34 * Check the content type OID
35 */
36int mscode_note_content_type(void *context, size_t hdrlen,
37 unsigned char tag,
38 const void *value, size_t vlen)
39{
40 enum OID oid;
41
42 oid = look_up_OID(value, vlen);
43 if (oid == OID__NR) {
44 char buffer[50];
45
46 sprint_oid(value, vlen, buffer, sizeof(buffer));
47 pr_err("Unknown OID: %s\n", buffer);
48 return -EBADMSG;
49 }
50
51 /*
52 * pesign utility had a bug where it was putting
53 * OID_msIndividualSPKeyPurpose instead of OID_msPeImageDataObjId
54 * So allow both OIDs.
55 */
56 if (oid != OID_msPeImageDataObjId &&
57 oid != OID_msIndividualSPKeyPurpose) {
58 pr_err("Unexpected content type OID %u\n", oid);
59 return -EBADMSG;
60 }
61
62 return 0;
63}
64
65/*
66 * Note the digest algorithm OID
67 */
68int mscode_note_digest_algo(void *context, size_t hdrlen,
69 unsigned char tag,
70 const void *value, size_t vlen)
71{
72 struct pefile_context *ctx = context;
73 char buffer[50];
74 enum OID oid;
75
76 oid = look_up_OID(value, vlen);
77 switch (oid) {
78 case OID_md4:
79 ctx->digest_algo = "md4";
80 break;
81 case OID_md5:
82 ctx->digest_algo = "md5";
83 break;
84 case OID_sha1:
85 ctx->digest_algo = "sha1";
86 break;
87 case OID_sha256:
88 ctx->digest_algo = "sha256";
89 break;
90 case OID_sha384:
91 ctx->digest_algo = "sha384";
92 break;
93 case OID_sha512:
94 ctx->digest_algo = "sha512";
95 break;
96 case OID_sha224:
97 ctx->digest_algo = "sha224";
98 break;
99
100 case OID__NR:
101 sprint_oid(value, vlen, buffer, sizeof(buffer));
102 pr_err("Unknown OID: %s\n", buffer);
103 return -EBADMSG;
104
105 default:
106 pr_err("Unsupported content type: %u\n", oid);
107 return -ENOPKG;
108 }
109
110 return 0;
111}
112
113/*
114 * Note the digest we're guaranteeing with this certificate
115 */
116int mscode_note_digest(void *context, size_t hdrlen,
117 unsigned char tag,
118 const void *value, size_t vlen)
119{
120 struct pefile_context *ctx = context;
121
122 ctx->digest = kmemdup(value, vlen, GFP_KERNEL);
123 if (!ctx->digest)
124 return -ENOMEM;
125
126 ctx->digest_len = vlen;
127
128 return 0;
129}
1/* Parse a Microsoft Individual Code Signing blob
2 *
3 * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12#define pr_fmt(fmt) "MSCODE: "fmt
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/err.h>
16#include <linux/oid_registry.h>
17#include <crypto/pkcs7.h>
18#include "verify_pefile.h"
19#include "mscode-asn1.h"
20
21/*
22 * Parse a Microsoft Individual Code Signing blob
23 */
24int mscode_parse(void *_ctx, const void *content_data, size_t data_len,
25 size_t asn1hdrlen)
26{
27 struct pefile_context *ctx = _ctx;
28
29 content_data -= asn1hdrlen;
30 data_len += asn1hdrlen;
31 pr_devel("Data: %zu [%*ph]\n", data_len, (unsigned)(data_len),
32 content_data);
33
34 return asn1_ber_decoder(&mscode_decoder, ctx, content_data, data_len);
35}
36
37/*
38 * Check the content type OID
39 */
40int mscode_note_content_type(void *context, size_t hdrlen,
41 unsigned char tag,
42 const void *value, size_t vlen)
43{
44 enum OID oid;
45
46 oid = look_up_OID(value, vlen);
47 if (oid == OID__NR) {
48 char buffer[50];
49
50 sprint_oid(value, vlen, buffer, sizeof(buffer));
51 pr_err("Unknown OID: %s\n", buffer);
52 return -EBADMSG;
53 }
54
55 /*
56 * pesign utility had a bug where it was putting
57 * OID_msIndividualSPKeyPurpose instead of OID_msPeImageDataObjId
58 * So allow both OIDs.
59 */
60 if (oid != OID_msPeImageDataObjId &&
61 oid != OID_msIndividualSPKeyPurpose) {
62 pr_err("Unexpected content type OID %u\n", oid);
63 return -EBADMSG;
64 }
65
66 return 0;
67}
68
69/*
70 * Note the digest algorithm OID
71 */
72int mscode_note_digest_algo(void *context, size_t hdrlen,
73 unsigned char tag,
74 const void *value, size_t vlen)
75{
76 struct pefile_context *ctx = context;
77 char buffer[50];
78 enum OID oid;
79
80 oid = look_up_OID(value, vlen);
81 switch (oid) {
82 case OID_md4:
83 ctx->digest_algo = "md4";
84 break;
85 case OID_md5:
86 ctx->digest_algo = "md5";
87 break;
88 case OID_sha1:
89 ctx->digest_algo = "sha1";
90 break;
91 case OID_sha256:
92 ctx->digest_algo = "sha256";
93 break;
94 case OID_sha384:
95 ctx->digest_algo = "sha384";
96 break;
97 case OID_sha512:
98 ctx->digest_algo = "sha512";
99 break;
100 case OID_sha224:
101 ctx->digest_algo = "sha224";
102 break;
103
104 case OID__NR:
105 sprint_oid(value, vlen, buffer, sizeof(buffer));
106 pr_err("Unknown OID: %s\n", buffer);
107 return -EBADMSG;
108
109 default:
110 pr_err("Unsupported content type: %u\n", oid);
111 return -ENOPKG;
112 }
113
114 return 0;
115}
116
117/*
118 * Note the digest we're guaranteeing with this certificate
119 */
120int mscode_note_digest(void *context, size_t hdrlen,
121 unsigned char tag,
122 const void *value, size_t vlen)
123{
124 struct pefile_context *ctx = context;
125
126 ctx->digest = kmemdup(value, vlen, GFP_KERNEL);
127 if (!ctx->digest)
128 return -ENOMEM;
129
130 ctx->digest_len = vlen;
131
132 return 0;
133}