kk Blog —— 通用基础

# 生成签名，密匙MOK_private.perm; 证书MOK.crt; DER格式证书MOK.der
openssl req -newkey rsa:4096 -nodes -keyout MOK_private.perm -new -x509 -sha512 -days 3650 -subj "/CN=my Machine Owner Key/" -out MOK.crt
openssl req -newkey rsa:4096 -nodes -keyout MOK_private.perm -new -x509 -sha512 -days 3650 -subj "/CN=test.com/" -out MOK.crt
openssl x509 -outform DER -in MOK.crt -out MOK.der

# pem 转 crt
openssl x509 -in MOK.pem -out MOK.crt

# 从密匙、证书提取公匙
openssl rsa -in MOK_private.perm -pubout -out MOK_pub.perm
openssl x509 -pubkey -in MOK.crt > MOK_pub.perm


# 从ko中提取摘要
openssl dgst -sha512 -binary test.ko.tmp > test.ko.sha512

# 依据 scripts/sign-file, 需要在摘要前加些东西再做签名
./a.out > test.ko.dgst
cat test.ko.sha512 >> test.ko.dgst

# 对摘要签名
openssl rsautl -sign -in test.ko.dgst -out test.ko.sig -inkey MOK_private.key

# 解密签名得到摘要
openssl rsautl -verify -inkey MOK.crt -certin -in test.ko.sig -o test.ko.verify1
openssl rsautl -verify -inkey MOK_pub.key -pubin -in test.ko.sig -o test.ko.verify2
diff test.ko.verify1 test.ko.dgst

# 直接用公匙验证签名
openssl dgst -sha512 -verify MOK_pub.key -signature test.ko.sig test.ko.tmp

#include <stdio.h>
int main()
{
	int i;
	char a[] = {    0x30, 0x51, 0x30, 0x0d, 0x06, 0x09,
			0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03,
			0x05, 0x00, 0x04, 0x40};

	for (i = 0; i < 19; i ++)
		printf("%c", a[i]);
	return 0;
}

不同算法需要在摘要前加下面内容
315 #
316 # Digest the data
317 #
318 my $prologue;
319 if ($dgst eq "sha1") {
320     $prologue = pack("C*",
321                      0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
322                      0x2B, 0x0E, 0x03, 0x02, 0x1A,
323                      0x05, 0x00, 0x04, 0x14);
324     $hash = 2;
325 } elsif ($dgst eq "sha224") {
326     $prologue = pack("C*",
327                      0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09,
328                      0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04,
329                      0x05, 0x00, 0x04, 0x1C);
330     $hash = 7;
331 } elsif ($dgst eq "sha256") {
332     $prologue = pack("C*",
333                      0x30, 0x31, 0x30, 0x0d, 0x06, 0x09,
334                      0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01,
335                      0x05, 0x00, 0x04, 0x20);
336     $hash = 4;
337 } elsif ($dgst eq "sha384") {
338     $prologue = pack("C*",
339                      0x30, 0x41, 0x30, 0x0d, 0x06, 0x09,
340                      0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02,
341                      0x05, 0x00, 0x04, 0x30);
342     $hash = 5;
343 } elsif ($dgst eq "sha512") {
344     $prologue = pack("C*",
345                      0x30, 0x51, 0x30, 0x0d, 0x06, 0x09,
346                      0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03,
347                      0x05, 0x00, 0x04, 0x40);
348     $hash = 6;
349 } else {
350     die "Unknown hash algorithm: $dgst\n";
351 }
352
353 my $signature;
354 if ($signature_file) {
355         $signature = read_file($signature_file);
356 } else {
357         #
358         # Generate the digest and read from openssl's stdout
359         #
360         my $digest;  # 先算摘要
361         $digest = readpipe("openssl dgst -$dgst -binary $module") || die "openssl dgst";
362 
363         #
364         # Generate the binary signature, which will be just the integer that
365         # comprises the signature with no metadata attached.
366         #
367         my $pid;     # 签名命令，签名的输入372行
368         $pid = open2(*read_from, *write_to,
369                      "openssl rsautl -sign -inkey $private_key -keyform PEM") ||
370             die "openssl rsautl";
371         binmode write_to; # 签名的输入是 $prologue . $digest
372         print write_to $prologue . $digest || die "pipe to openssl rsautl";
373         close(write_to) || die "pipe to openssl rsautl";
374 
375         binmode read_from;
376         read(read_from, $signature, 4096) || die "pipe from openssl rsautl";
377         close(read_from) || die "pipe from openssl rsautl";
378         waitpid($pid, 0) || die;
379         die "openssl rsautl died: $?" if ($? >> 8);
380 }
381 $signature = pack("n", length($signature)) . $signature,
382 

sudo yum install openssl
sudo yum install kernel-devel
sudo yum install perl
sudo yum install mokutil
sudo yum install keyutils

Source of X.509 Keys     User Ability to Add Keys    Keys Loaded During Boot
UEFI Secure Boot "db"     Limited             .system_keyring
UEFI Secure Boot "dbx"        Limited             .system_keyring
Machine Owner Key (MOK) list  Yes             .system_keyring

sudo keyctl list %:.system_keyring

sudo cat << EOF > configuration_file.config
[ req ]
default_bits = 4096
distinguished_name = req_distinguished_name
prompt = no
string_mask = utf8only
x509_extensions = myexts

[ req_distinguished_name ]
O = <你的签名key的名字>
emailAddress = <你的E-mail>

[ myexts ]
basicConstraints=critical,CA:FALSE
keyUsage=digitalSignature
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid
EOF

sudo openssl req -x509 -new -nodes -utf8 -sha256 -days 36500 \
	-batch -config configuration_file.config -outform DER \
	-out public_key.der                   \  
	-keyout private_key.priv

sudo mokutil --import my_signing_key_pub.der

sudo reboot

sudo keyctl list %:.system_keyring

rpm -ql kmod-wl

sudo perl /usr/src/kernels/$(uname -r)/scripts/sign-file \
	sha256 \
	/home/feyan/feyan_signing_key_pub.der\     #公钥文件（位置和名称视具体情况）
	/home/fayan/feyan_signing_key.priv\        #私钥文件（位置和名称视具体情况）
	/lib/modules/3.10.0-514.10.2.el7.x86_64/extra/wl/wl.ko   #模块文件

sudo modprobe wl