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[u-boot.git] / lib / mbedtls / mscode_parser.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * MSCode parser using MbedTLS ASN1 library
4  *
5  * Copyright (c) 2024 Linaro Limited
6  * Author: Raymond Mao <[email protected]>
7  */
8
9 #include <linux/kernel.h>
10 #include <linux/err.h>
11 #include <crypto/pkcs7.h>
12 #include <crypto/mscode.h>
13
14 /*
15  * Parse a Microsoft Individual Code Signing blob
16  *
17  * U.P.SEQUENCE {
18  *    U.P.OBJECTIDENTIFIER 1.3.6.1.4.1.311.2.1.15 (SPC_PE_IMAGE_DATA_OBJID)
19  *    U.P.SEQUENCE {
20  *       U.P.BITSTRING NaN : 0 unused bit(s);
21  *       [C.P.0] {
22  *          [C.P.2] {
23  *             [C.P.0] <arbitrary string>
24  *          }
25  *       }
26  *    }
27  * }
28  * U.P.SEQUENCE {
29  *    U.P.SEQUENCE {
30  *       U.P.OBJECTIDENTIFIER <digest algorithm OID>
31  *       U.P.NULL
32  *    }
33  *    U.P.OCTETSTRING <PE image digest>
34  * }
35  *
36  * @ctx: PE file context.
37  * @content_data: content data pointer.
38  * @data_len: content data length.
39  * @asn1hdrlen: ASN1 header length.
40  */
41 int mscode_parse(void *ctx, const void *content_data, size_t data_len,
42                  size_t asn1hdrlen)
43 {
44         struct pefile_context *_ctx = ctx;
45         unsigned char *p = (unsigned char *)content_data;
46         unsigned char *end = (unsigned char *)content_data + data_len;
47         size_t len = 0;
48         int ret;
49         unsigned char *inner_p;
50         size_t seq_len = 0;
51
52         ret = mbedtls_asn1_get_tag(&p, end, &seq_len,
53                                    MBEDTLS_ASN1_CONSTRUCTED |
54                                    MBEDTLS_ASN1_SEQUENCE);
55         if (ret)
56                 return ret;
57
58         inner_p = p;
59         ret = mbedtls_asn1_get_tag(&inner_p, inner_p + seq_len, &len,
60                                    MBEDTLS_ASN1_OID);
61         if (ret)
62                 return ret;
63
64         /* Sanity check on the PE Image Data OID (1.3.6.1.4.1.311.2.1.15) */
65         if (MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_MICROSOFT_PEIMAGEDATA, inner_p,
66                                 len))
67                 return -EINVAL;
68
69         p += seq_len;
70         ret = mbedtls_asn1_get_tag(&p, end, &seq_len,
71                                    MBEDTLS_ASN1_CONSTRUCTED |
72                                    MBEDTLS_ASN1_SEQUENCE);
73         if (ret)
74                 return ret;
75
76         ret = mbedtls_asn1_get_tag(&p, p + seq_len, &seq_len,
77                                    MBEDTLS_ASN1_CONSTRUCTED |
78                                    MBEDTLS_ASN1_SEQUENCE);
79         if (ret)
80                 return ret;
81
82         inner_p = p;
83
84         /*
85          * Check if the inner sequence contains a supported hash
86          * algorithm OID
87          */
88         ret = mbedtls_asn1_get_tag(&inner_p, inner_p + seq_len, &len,
89                                    MBEDTLS_ASN1_OID);
90         if (ret)
91                 return ret;
92
93         if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_MD5, inner_p, len))
94                 _ctx->digest_algo = "md5";
95         else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA1, inner_p,
96                                       len))
97                 _ctx->digest_algo = "sha1";
98         else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA224, inner_p,
99                                       len))
100                 _ctx->digest_algo = "sha224";
101         else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA256, inner_p,
102                                       len))
103                 _ctx->digest_algo = "sha256";
104         else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA384, inner_p,
105                                       len))
106                 _ctx->digest_algo = "sha384";
107         else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA512, inner_p,
108                                       len))
109                 _ctx->digest_algo = "sha512";
110
111         if (!_ctx->digest_algo)
112                 return -EINVAL;
113
114         p += seq_len;
115         ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING);
116         if (ret)
117                 return ret;
118
119         _ctx->digest = p;
120         _ctx->digest_len = len;
121
122         return 0;
123 }
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