Linux:建立你自己的 CA 服务：OpenSSL 命令行 CA 操作快速指南
May 29, 2015
这些是关于使用 OpenSSL 生成证书授权（CA）、中间证书授权和末端证书的速记随笔，内容包括 OCSP、CRL 和 CA 颁发者信息，以及指定颁发和有效期限等。
我们将建立我们自己的根 CA，我们将使用根 CA 来生成一个中间 CA 的例子，我们将使用中间 CA 来签署末端用户证书。
Table of Contents
根 CA
创建根 CA 授权目录并切换到该目录：
mkdir ~/SSLCA/root/ cd ~/SSLCA/root/
为我们的根 CA 生成一个8192位长的 SHA-256 RSA 密钥：
openssl genrsa -aes256 -out rootca.key 8192
样例输出：
Generating RSA private key, 8192 bit long modulus .........++ ....................................................................................................................++ e is 65537 (0x10001)
如果你想要用密码保护该密钥，请添加
创建自签名根 CA 证书 ca.crt；你需要为你的根 CA 提供一个身份：
openssl req -sha256 -new -x509 -days 1826 -key rootca.key -out rootca.crt
样例输出：
You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [AU]:NL State or Province Name (full name) [Some-State]:Zuid Holland Locality Name (eg, city) []:Rotterdam Organization Name (eg, company) [Internet Widgits Pty Ltd]:Sparkling Network Organizational Unit Name (eg, section) []:Sparkling CA Common Name (e.g. server FQDN or YOUR name) []:Sparkling Root CA Email Address []:
创建一个存储 CA 序列的文件：
touch certindex echo 1000 > certserial echo 1000 > crlnumber
放置 CA 配置文件，该文件持有 CRL 和 OCSP 末端的存根。
# vim ca.conf [ ca ] default_ca = myca [ crl_ext ] issuerAltName=issuer:copy authorityKeyIdentifier=keyid:always [ myca ] dir = ./ new_certs_dir = $dir unique_subject = no certificate = $dir/rootca.crt database = $dir/certindex private_key = $dir/rootca.key serial = $dir/certserial default_days = 730 default_md = sha1 policy = myca_policy x509_extensions = myca_extensions crlnumber = $dir/crlnumber default_crl_days = 730 [ myca_policy ] commonName = supplied stateOrProvinceName = supplied countryName = optional emailAddress = optional organizationName = supplied organizationalUnitName = optional [ myca_extensions ] basicConstraints = critical,CA:TRUE keyUsage = critical,any subjectKeyIdentifier = hash authorityKeyIdentifier = keyid:always,issuer keyUsage = digitalSignature,keyEncipherment,cRLSign,keyCertSign extendedKeyUsage = serverAuth crlDistributionPoints = @crl_section subjectAltName = @alt_names authorityInfoAccess = @ocsp_section [ v3_ca ] basicConstraints = critical,CA:TRUE,pathlen:0 keyUsage = critical,any subjectKeyIdentifier = hash authorityKeyIdentifier = keyid:always,issuer keyUsage = digitalSignature,keyEncipherment,cRLSign,keyCertSign extendedKeyUsage = serverAuth crlDistributionPoints = @crl_section subjectAltName = @alt_names authorityInfoAccess = @ocsp_section [alt_names] DNS.0 = Sparkling Intermidiate CA 1 DNS.1 = Sparkling CA Intermidiate 1 [crl_section] URI.0 = http://pki.sparklingca.com/SparklingRoot.crl URI.1 = http://pki.backup.com/SparklingRoot.crl [ocsp_section] caIssuers;URI.0 = http://pki.sparklingca.com/SparklingRoot.crt caIssuers;URI.1 = http://pki.backup.com/SparklingRoot.crt OCSP;URI.0 = http://pki.sparklingca.com/ocsp/ OCSP;URI.1 = http://pki.backup.com/ocsp/
如果你需要设置某个特定的证书生效/过期日期，请添加以下内容到[myca]：
# format: YYYYMMDDHHMMSS default_enddate = 20191222035911 default_startdate = 20181222035911
创建中间 CA
生成中间 CA （名为 intermediate1）的私钥：
openssl genrsa -out intermediate1.key 4096
生成中间 CA 的 CSR：
openssl req -new -sha256 -key intermediate1.key -out intermediate1.csr
样例输出：
You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [AU]:NL State or Province Name (full name) [Some-State]:Zuid Holland Locality Name (eg, city) []:Rotterdam Organization Name (eg, company) [Internet Widgits Pty Ltd]:Sparkling Network Organizational Unit Name (eg, section) []:Sparkling CA Common Name (e.g. server FQDN or YOUR name) []:Sparkling Intermediate CA Email Address []: Please enter the following 'extra' attributes to be sent with your certificate request A challenge password []: An optional company name []:
确保中间 CA 的主体（CN）和根 CA 不同。
用根 CA 签署中间 CA 的 CSR：
openssl ca -batch -config ca.conf -notext -in intermediate1.csr -out intermediate1.crt
样例输出：
Using configuration from ca.conf Check that the request matches the signature Signature ok The Subject's Distinguished Name is as follows countryName :PRINTABLE:'NL' stateOrProvinceName :ASN.1 12:'Zuid Holland' localityName :ASN.1 12:'Rotterdam' organizationName :ASN.1 12:'Sparkling Network' organizationalUnitName:ASN.1 12:'Sparkling CA' commonName :ASN.1 12:'Sparkling Intermediate CA' Certificate is to be certified until Mar 30 15:07:43 2017 GMT (730 days) Write out database with 1 new entries Data Base Updated
生成 CRL（同时采用 PEM 和 DER 格式）：
openssl ca -config ca.conf -gencrl -keyfile rootca.key -cert rootca.crt -out rootca.crl.pem openssl crl -inform PEM -in rootca.crl.pem -outform DER -out rootca.crl
每次使用该 CA 签署证书后，请生成 CRL。
如果你需要撤销该中间证书：
openssl ca -config ca.conf -revoke intermediate1.crt -keyfile rootca.key -cert rootca.crt
配置中间 CA
为该中间 CA 创建一个新文件夹，然后进入该文件夹：
mkdir ~/SSLCA/intermediate1/ cd ~/SSLCA/intermediate1/
从根 CA 拷贝中间证书和密钥：
cp ~/SSLCA/root/intermediate1.key ./ cp ~/SSLCA/root/intermediate1.crt ./
创建索引文件：
touch certindex echo 1000 > certserial echo 1000 > crlnumber
创建一个新的
# vim ca.conf [ ca ] default_ca = myca [ crl_ext ] issuerAltName=issuer:copy authorityKeyIdentifier=keyid:always [ myca ] dir = ./ new_certs_dir = $dir unique_subject = no certificate = $dir/intermediate1.crt database = $dir/certindex private_key = $dir/intermediate1.key serial = $dir/certserial default_days = 365 default_md = sha1 policy = myca_policy x509_extensions = myca_extensions crlnumber = $dir/crlnumber default_crl_days = 365 [ myca_policy ] commonName = supplied stateOrProvinceName = supplied countryName = optional emailAddress = optional organizationName = supplied organizationalUnitName = optional [ myca_extensions ] basicConstraints = critical,CA:FALSE keyUsage = critical,any subjectKeyIdentifier = hash authorityKeyIdentifier = keyid:always,issuer keyUsage = digitalSignature,keyEncipherment extendedKeyUsage = serverAuth crlDistributionPoints = @crl_section subjectAltName = @alt_names authorityInfoAccess = @ocsp_section [alt_names] DNS.0 = example.com DNS.1 = example.org [crl_section] URI.0 = http://pki.sparklingca.com/SparklingIntermidiate1.crl URI.1 = http://pki.backup.com/SparklingIntermidiate1.crl [ocsp_section] caIssuers;URI.0 = http://pki.sparklingca.com/SparklingIntermediate1.crt caIssuers;URI.1 = http://pki.backup.com/SparklingIntermediate1.crt OCSP;URI.0 = http://pki.sparklingca.com/ocsp/ OCSP;URI.1 = http://pki.backup.com/ocsp/
修改 subjectAltName = @alt_names的行。
如果你需要设置一个指定的生效/到期日期，请添加以下内容到 [myca]：
# format: YYYYMMDDHHMMSS default_enddate = 20191222035911 default_startdate = 20181222035911
生成一个空白 CRL（同时以 PEM 和 DER 格式）：
openssl ca -config ca.conf -gencrl -keyfile rootca.key -cert rootca.crt -out rootca.crl.pem openssl crl -inform PEM -in rootca.crl.pem -outform DER -out rootca.crl
生成末端用户证书
我们使用这个新的中间 CA 来生成一个末端用户证书，请重复以下操作来使用该 CA 为每个用户签署。
mkdir enduser-certs
生成末端用户的私钥：
openssl genrsa -out enduser-certs/enduser-example.com.key 4096
生成末端用户的 CSR：
openssl req -new -sha256 -key enduser-certs/enduser-example.com.key -out enduser-certs/enduser-example.com.csr
样例输出：
You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [AU]:NL State or Province Name (full name) [Some-State]:Noord Holland Locality Name (eg, city) []:Amsterdam Organization Name (eg, company) [Internet Widgits Pty Ltd]:Example Inc Organizational Unit Name (eg, section) []:IT Dept Common Name (e.g. server FQDN or YOUR name) []:example.com Email Address []: Please enter the following 'extra' attributes to be sent with your certificate request A challenge password []: An optional company name []:
使用中间 CA 签署末端用户的 CSR：
openssl ca -batch -config ca.conf -notext -in enduser-certs/enduser-example.com.csr -out enduser-certs/enduser-example.com.crt
样例输出：
Using configuration from ca.conf Check that the request matches the signature Signature ok The Subject's Distinguished Name is as follows countryName :PRINTABLE:'NL' stateOrProvinceName :ASN.1 12:'Noord Holland' localityName :ASN.1 12:'Amsterdam' organizationName :ASN.1 12:'Example Inc' organizationalUnitName:ASN.1 12:'IT Dept' commonName :ASN.1 12:'example.com' Certificate is to be certified until Mar 30 15:18:26 2016 GMT (365 days) Write out database with 1 new entries Data Base Updated
生成 CRL（同时以 PEM 和 DER 格式）：
openssl ca -config ca.conf -gencrl -keyfile intermediate1.key -cert intermediate1.crt -out intermediate1.crl.pem openssl crl -inform PEM -in intermediate1.crl.pem -outform DER -out intermediate1.crl
每次你使用该 CA 签署证书后，都需要生成 CRL。
如果你需要撤销该末端用户证书：
openssl ca -config ca.conf -revoke enduser-certs/enduser-example.com.crt -keyfile intermediate1.key -cert intermediate1.crt
样例输出：
Using configuration from ca.conf Revoking Certificate 1000. Data Base Updated
通过连接根证书和中间证书来创建证书链文件。
cat ../root/rootca.crt intermediate1.crt > enduser-certs/enduser-example.com.chain
发送以下文件给末端用户：
enduser-example.com.crt enduser-example.com.key enduser-example.com.chain
你也可以让末端用户提供他们自己的 CSR，而只发送给他们这个 .crt 文件。不要把它从服务器删除，否则你就不能撤销了。
校验证书
你可以对证书链使用以下命令来验证末端用户证书：
openssl verify -CAfile enduser-certs/enduser-example.com.chain enduser-certs/enduser-example.com.crt enduser-certs/enduser-example.com.crt: OK
你也可以针对 CRL 来验证。首先，将 PEM 格式的 CRL 和证书链相连接：
cat ../root/rootca.crt intermediate1.crt intermediate1.crl.pem > enduser-certs/enduser-example.com.crl.chain
验证证书：
openssl verify -crl_check -CAfile enduser-certs/enduser-example.com.crl.chain enduser-certs/enduser-example.com.crt
没有撤销时的输出：
enduser-certs/enduser-example.com.crt: OK
撤销后的输出如下：
enduser-certs/enduser-example.com.crt: CN = example.com, ST = Noord Holland, C = NL, O = Example Inc, OU = IT Dept error 23 at 0 depth lookup:certificate revoked
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