生成自签名证书脚本

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简介

基于OpenSSL实现自动生成自签名证书

实现

脚本如下

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#! /bin/bash

DOMAIN=test1.zerchin.xyz
DOMAIN_EXT=
IP=172.16.1.188
DATE=3650

## generate CA : cakey.pem && cacerts.pem
if [[ ! -e "cacerts.pem" || ! -e "cakey.pem" ]]
then
  openssl genrsa -out cakey.pem 2048
  openssl req -x509 -new -nodes -key cakey.pem -subj "/CN=zerchin" -days ${DATE} -out cacerts.pem 
fi


## generate server tls
mkdir ${DOMAIN}
openssl genrsa -out ${DOMAIN}/tls.key 2048

cat > ${DOMAIN}/csr.conf << EOF
[ req ]
default_bits = 2048
prompt = no
default_md = sha256
req_extensions = req_ext
distinguished_name = dn
[ dn ]
C = CN
ST = GD
L = SZ
O = zerchin
OU = zerchin
CN = ${DOMAIN}
[ req_ext ]
subjectAltName = @alt_names
[ alt_names ]
EOF
if [[ -n ${DOMAIN_EXT} ]]
then
    IFS=","
    DNS=(${DOMAIN})
    DNS+=(${DOMAIN_EXT})
    for i in ${!DNS[@]} 
    do
        echo DNS.${i} "=" ${DNS[$i]} >> ${DOMAIN}/csr.conf
    done
    echo DNS.
fi
if [[ -n ${IP} ]]
then
    IFS=","
    ip=(${IP})
    for i in ${!ip[@]} 
    do
        echo IP.${i} "=" ${ip[$i]} >> ${DOMAIN}/csr.conf
    done
    echo DNS.
fi
cat >> ${DOMAIN}/csr.conf << EOF
[ v3_ext ]
authorityKeyIdentifier=keyid,issuer:always
basicConstraints=CA:FALSE
keyUsage=nonRepudiation,digitalSignature,keyEncipherment
extendedKeyUsage=serverAuth,clientAuth
subjectAltName=@alt_names
EOF


# 
openssl req -new -key ${DOMAIN}/tls.key -out ${DOMAIN}/tls.csr -config ${DOMAIN}/csr.conf

#
openssl x509 -req -in ${DOMAIN}/tls.csr -CA cacerts.pem  -CAkey cakey.pem \
  -CAcreateserial -out ${DOMAIN}/tls.crt -days ${DATE} \
  -extensions v3_ext -extfile ${DOMAIN}/csr.conf

参数说明：

DOMAIN：必填项，证书的域名

DOMAIN_EXT：可选，额外的域名，多个域名以逗号隔开，没有则留空

IP：可选，可信任的IP地址，多个IP地址以逗号隔开，没有则留空

DATE：证书有效期，默认是10年

生成自签名证书

将上述脚本保存到文件中并执行

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bash auto-generate-cert.sh

验证

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# verify tls
openssl x509  -noout -text -in test1.zerchin.xyz/tls.crt
# verify CA
openssl verify -CAfile cacerts.pem test1.zerchin.xyz/tls.crt
# verify server
openssl s_client -connect test1.zerchin.xyz:443 -servername test1.zerchin.xyz
openssl s_client -connect test1.zerchin.xyz:443 -servername test1.zerchin.xyz -CAfile cacerts.pem