1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
package main
import (
"bytes"
"crypto/x509"
"fmt"
"log"
"os"
"github.com/foxboron/go-uefi/authenticode"
"github.com/foxboron/go-uefi/efi/attributes"
"github.com/foxboron/go-uefi/efi/signature"
"github.com/foxboron/go-uefi/pkcs7"
)
func FormatSignatureList(siglist []*signature.SignatureList) {
fmt.Printf("\nNumber of Signatures in the Signature List: %d\n", len(siglist))
for _, sig := range siglist {
fmt.Printf("\nSignature Type: %s\n", signature.ValidEFISignatureSchemes[sig.SignatureType])
fmt.Printf("Signature List List Size : %d\n", sig.ListSize)
fmt.Printf("Signature List Header Size : %d\n", sig.HeaderSize)
fmt.Printf("Signature List Size : %d\n", sig.Size)
fmt.Printf("Signature List Signature Header: %x (usually empty)\n", sig.SignatureHeader)
fmt.Printf("Signature List Number of Signatures: %d\n", len(sig.Signatures))
fmt.Printf("Signature List Signatures:\n")
for _, sigEntry := range sig.Signatures {
fmt.Printf(" Signature Owner: %s\n", sigEntry.Owner.Format())
switch sig.SignatureType {
case signature.CERT_X509_GUID:
cert, _ := x509.ParseCertificate(sigEntry.Data)
fmt.Printf(" Issuer: %s\n", cert.Issuer.String())
fmt.Printf(" Serial Number: %d\n", cert.SerialNumber)
case signature.CERT_SHA256_GUID:
fmt.Printf(" Type: %s\n", "SHA256")
fmt.Printf(" Checksum: %x\n", sigEntry.Data)
default:
fmt.Println("Not implemented!")
fmt.Println(sig.SignatureType.Format())
}
}
}
}
func ParseKeyDb(filename string) {
_, f, _ := attributes.ReadEfivarsFile(filename)
siglist, err := signature.ReadSignatureDatabase(f)
if err != nil {
log.Fatal(err)
}
FormatSignatureList(siglist)
}
func ParseSignatureList(filename string) {
b, _ := os.ReadFile(filename)
f := bytes.NewReader(b)
siglist, err := signature.ReadSignatureDatabase(f)
if err != nil {
log.Fatal(err)
}
FormatSignatureList(siglist)
}
func FormatEFIVariableAuth2(sig *signature.EFIVariableAuthentication2) {
fmt.Println("EFI Authentication Variable")
fmt.Printf(" EFI Signing Time: %s\n", sig.Time.Format())
fmt.Println(" WINCertificate Info")
fmt.Println(" Header:")
fmt.Printf(" Length %d\n", sig.AuthInfo.Header.Length)
fmt.Printf(" Revision: 0x%x (should be 0x200) \n", sig.AuthInfo.Header.Revision)
fmt.Printf(" CertType: %s\n", signature.WINCertTypeString[sig.AuthInfo.Header.CertType])
fmt.Printf(" Certificate Type: ")
switch sig.AuthInfo.CertType {
case signature.EFI_CERT_TYPE_RSA2048_SHA256_GUID:
fmt.Println("RSA2048 SHA256")
case signature.EFI_CERT_TYPE_PKCS7_GUID:
fmt.Println("PKCS7")
}
// pkcs7.ParseSignature(sig.AuthInfo.CertData)
// l, err := moz.Parse(sig.AuthInfo.CertData)
// if err != nil {
// log.Fatal(err)
// }
// fmt.Printf("%+v", l)
// err := ioutil.WriteFile("test.bin", sig.AuthInfo.CertData, 0644)
// if err != nil {
// log.Fatal(err)
// }
}
func ParseEFIAuthVariable(filename string) {
b, _ := os.ReadFile(filename)
reader := bytes.NewReader(b)
// Fetch the signature
sig, err := signature.ReadEFIVariableAuthencation2(reader)
if err != nil {
log.Fatal(err)
}
FormatEFIVariableAuth2(sig)
siglist, err := signature.ReadSignatureDatabase(reader)
if err != nil {
log.Fatal(err)
}
FormatSignatureList(siglist)
}
func ParseEFIImage(filename string) {
b, err := os.ReadFile(filename)
if err != nil {
log.Fatal(err)
os.Exit(1)
}
binary, err := authenticode.Parse(bytes.NewReader(b))
if err != nil {
log.Fatal(err)
}
fmt.Println("Data Directory Header:")
fmt.Printf(" Virtual Address: 0x%x\n", binary.Datadir.VirtualAddress)
fmt.Printf(" Size in bytes: %d\n", binary.Datadir.Size)
if binary.Datadir.Size == 0 {
fmt.Println("No signatures")
}
signatures, err := binary.Signatures()
if err != nil {
log.Fatal(err)
}
for _, sig := range signatures {
fmt.Printf("Certificate Type: %s\n", signature.WINCertTypeString[sig.CertType])
c, err := pkcs7.ParsePKCS7(sig.Certificate)
if err != nil {
log.Fatal(err)
}
for range c.SignerInfo {
// TODO: Implement issuer and serial number parsing
continue
}
}
}
func main() {
if len(os.Args) == 1 {
log.Fatalln("Need type")
}
if len(os.Args) == 2 {
log.Fatalln("Need filename")
}
efiType := os.Args[1]
file := os.Args[2]
switch efiType {
case "KEK", "PK", "db", "dbx":
ParseKeyDb(file)
case "siglist":
ParseSignatureList(file)
case "signed":
ParseEFIAuthVariable(file)
case "signed-image":
ParseEFIImage(file)
}
}
|
