| AKASHI Takahiro | fea4c84 | 2022-07-05 14:48:11 +0900 | [diff] [blame] | 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 | #ifndef __UBOOT__ |
| 11 | #include <linux/slab.h> |
| 12 | #endif |
| 13 | #include <linux/err.h> |
| 14 | #include <linux/oid_registry.h> |
| 15 | #include <crypto/pkcs7.h> |
| 16 | #ifdef __UBOOT__ |
| 17 | #include <crypto/mscode.h> |
| 18 | #else |
| 19 | #include "verify_pefile.h" |
| 20 | #endif |
| 21 | #include "mscode.asn1.h" |
| 22 | |
| 23 | /* |
| 24 | * Parse a Microsoft Individual Code Signing blob |
| 25 | */ |
| 26 | int mscode_parse(void *_ctx, const void *content_data, size_t data_len, |
| 27 | size_t asn1hdrlen) |
| 28 | { |
| 29 | struct pefile_context *ctx = _ctx; |
| 30 | |
| 31 | content_data -= asn1hdrlen; |
| 32 | data_len += asn1hdrlen; |
| 33 | pr_devel("Data: %zu [%*ph]\n", data_len, (unsigned)(data_len), |
| 34 | content_data); |
| 35 | |
| 36 | return asn1_ber_decoder(&mscode_decoder, ctx, content_data, data_len); |
| 37 | } |
| 38 | |
| 39 | /* |
| 40 | * Check the content type OID |
| 41 | */ |
| 42 | int mscode_note_content_type(void *context, size_t hdrlen, |
| 43 | unsigned char tag, |
| 44 | const void *value, size_t vlen) |
| 45 | { |
| 46 | enum OID oid; |
| 47 | |
| 48 | oid = look_up_OID(value, vlen); |
| 49 | if (oid == OID__NR) { |
| 50 | char buffer[50]; |
| 51 | |
| 52 | sprint_oid(value, vlen, buffer, sizeof(buffer)); |
| 53 | pr_err("Unknown OID: %s\n", buffer); |
| 54 | return -EBADMSG; |
| 55 | } |
| 56 | |
| 57 | /* |
| 58 | * pesign utility had a bug where it was putting |
| 59 | * OID_msIndividualSPKeyPurpose instead of OID_msPeImageDataObjId |
| 60 | * So allow both OIDs. |
| 61 | */ |
| 62 | if (oid != OID_msPeImageDataObjId && |
| 63 | oid != OID_msIndividualSPKeyPurpose) { |
| 64 | pr_err("Unexpected content type OID %u\n", oid); |
| 65 | return -EBADMSG; |
| 66 | } |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | /* |
| 72 | * Note the digest algorithm OID |
| 73 | */ |
| 74 | int mscode_note_digest_algo(void *context, size_t hdrlen, |
| 75 | unsigned char tag, |
| 76 | const void *value, size_t vlen) |
| 77 | { |
| 78 | struct pefile_context *ctx = context; |
| 79 | char buffer[50]; |
| 80 | enum OID oid; |
| 81 | |
| 82 | oid = look_up_OID(value, vlen); |
| 83 | switch (oid) { |
| 84 | case OID_md4: |
| 85 | ctx->digest_algo = "md4"; |
| 86 | break; |
| 87 | case OID_md5: |
| 88 | ctx->digest_algo = "md5"; |
| 89 | break; |
| 90 | case OID_sha1: |
| 91 | ctx->digest_algo = "sha1"; |
| 92 | break; |
| 93 | case OID_sha256: |
| 94 | ctx->digest_algo = "sha256"; |
| 95 | break; |
| 96 | case OID_sha384: |
| 97 | ctx->digest_algo = "sha384"; |
| 98 | break; |
| 99 | case OID_sha512: |
| 100 | ctx->digest_algo = "sha512"; |
| 101 | break; |
| 102 | case OID_sha224: |
| 103 | ctx->digest_algo = "sha224"; |
| 104 | break; |
| 105 | |
| 106 | case OID__NR: |
| 107 | sprint_oid(value, vlen, buffer, sizeof(buffer)); |
| 108 | pr_err("Unknown OID: %s\n", buffer); |
| 109 | return -EBADMSG; |
| 110 | |
| 111 | default: |
| 112 | pr_err("Unsupported content type: %u\n", oid); |
| 113 | return -ENOPKG; |
| 114 | } |
| 115 | |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * Note the digest we're guaranteeing with this certificate |
| 121 | */ |
| 122 | int mscode_note_digest(void *context, size_t hdrlen, |
| 123 | unsigned char tag, |
| 124 | const void *value, size_t vlen) |
| 125 | { |
| 126 | struct pefile_context *ctx = context; |
| 127 | |
| 128 | ctx->digest = kmemdup(value, vlen, GFP_KERNEL); |
| 129 | if (!ctx->digest) |
| 130 | return -ENOMEM; |
| 131 | |
| 132 | ctx->digest_len = vlen; |
| 133 | |
| 134 | return 0; |
| 135 | } |