自签CA并更新根证书

# 自签 CA

> 参考 https://2heng.xin/2018/12/16/your-own-ca-with-openssl/ 并修改部分参数

```
#!/bin/bash

openssl genrsa -out cakey.pem 2048

cat << EOF > root.conf
[ req ]
default_bits        = 2048
default_keyfile     = key.pem
default_md          = sha256
distinguished_name  = req_distinguished_name
req_extensions      = req_ext
string_mask         = nombstr
x509_extensions     = x509_ext

[ req_distinguished_name ]
countryName                 = Country Name (2 letter code)
countryName_default         = CN
stateOrProvinceName         = State or Province Name (full name)
stateOrProvinceName_default = Shanghai
localityName                = Locality Name (eg, city)
localityName_default        = Shanghai
organizationName            = Organization Name (eg, company)
organizationName_default    = Dragonfly
commonName                  = Common Name (e.g. server FQDN or YOUR name)
commonName_max              = 64
commonName_default          = Dragonfly Fake Authority CA

[ x509_ext ]
authorityKeyIdentifier = keyid,issuer
basicConstraints       = CA:TRUE
keyUsage               = digitalSignature, keyEncipherment, keyCertSign, cRLSign
subjectKeyIdentifier   = hash

[ req_ext ]
basicConstraints     = CA:TRUE
keyUsage             = digitalSignature, keyEncipherment, keyCertSign, cRLSign
subjectKeyIdentifier = hash
EOF

openssl req -batch -new -x509 -key ./cakey.pem -out ./cacert.pem -days 7300 -config ./root.conf
openssl x509 -inform PEM -in ./cacert.pem -outform DER -out ./CA.cer

openssl x509 -in ./cacert.pem -noout -text
```

# 更新本地信任链

```
#/bin/bash

. /etc/os-release
case $ID in
ubuntu)
    # Ubuntu
    cp cacert.pem /usr/local/share/ca-certificates/
    update-ca-certificates
    ;;
debian)
    # Debian
    cp cacert.pem /usr/share/ca-certificates/
    echo cacert.pem >> /etc/ca-certificates.conf
    update-ca-certificates
    ;;
centos|fedora|rhel)
    # CentOS, Fedora, RedHat
    update-ca-trust force-enable
    cp cacert.pem /etc/pki/ca-trust/source/anchors/
    update-ca-trust
    ;;
*)
    exit 1
    ;;
esac
```

# 自签证书

```
cat << EOF > server.conf
[ req ]
default_bits        = 2048
default_keyfile     = key.pem
default_md          = sha256
string_mask         = nombstr
distinguished_name  = req_distinguished_name
req_extensions      = req_ext
x509_extensions     = x509_ext

[ x509_ext ]
subjectKeyIdentifier   = hash
authorityKeyIdentifier = keyid,issuer
basicConstraints       = CA:FALSE
keyUsage               = digitalSignature, keyEncipherment
subjectAltName         = @alt_names

[ req_ext ]
subjectKeyIdentifier = hash
basicConstraints     = CA:FALSE
keyUsage             = digitalSignature, keyEncipherment
subjectAltName       = @alt_names

[ alt_names ]
DNS.1   = *.df
DNS.2   = df
IP.1    = 127.0.0.1
IP.2    = 8.8.8.8
EOF

mkdir server

# gen key
openssl genrsa -out ./server/key.pem 2048

# gen csr
openssl req -batch -new -key ./server/key.pem -out ./server/server.csr -config ./server.conf

# review csr
openssl req -in ./server/server.csr -noout -text

# gen cert
openssl x509 -req -in ./server/server.csr -CA cacert.pem -CAkey cakey.pem -CAcreateserial -out ./server/cert.pem

# review cert
openssl x509 -in ./server/cert.pem -noout -text
```

# Reference

https://gist.github.com/soarez/9688998
https://2heng.xin/2018/12/16/your-own-ca-with-openssl/

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