openssl 自签发证书及ssl 原理简介（一）

提纲：

1、使用openssl自签发证书

2、配置apache

3、配置客户端

4、使用自签发证书访问apache

一、使用Openssl自签发证书

首先装openssl 。编辑配置文件/etc/ssl/openssl.conf ，配置TSA root dir 等以下配置

[ tsa_config1 ]

# These are used by the TSA reply generation only.
dir     =  ./demoCA     # TSA root directory
serial      = $dir/serial   # The current serial number (mandatory)
crypto_device   = builtin       # OpenSSL engine to use for signing
signer_cert = $dir/cacert.pem   # The TSA signing certificate
                    # (optional)
certs       = $dir/cacert.pem   # Certificate chain to include in reply
                    # (optional)
signer_key  = $dir/private/cakey.pem # The TSA private key (optional)

然后就可以生成CA以及server、user的证书了。

1、建立cert文件结构。

root@ubuntu:~/certs# mkdir -p ./demoCA/{private,newcerts}
root@ubuntu:~/certs# touch ./demoCA/index.txt
root@ubuntu:~/certs# echo 01 > ./demoCA/serial
 
  
 
  
 
  
 
  
 
  
 2、生成CA私钥与CA证书。
 
  
 
  
openssl genrsa -des3 -out ./demoCA/private/cakey.pem 2048
Generating RSA private key, 2048 bit long modulus
.+++
............+++
e is 65537 (0x10001)
Enter pass phrase for ./demoCA/private/cakey.pem:
Verifying - Enter pass phrase for ./demoCA/private/cakey.pem:
root@ubuntu:~/certs# openssl req -new -x509 -days 365 -key ./demoCA/private/cakey.pem -out ./demoCA/cacert.pem
Enter pass phrase for ./demoCA/private/cakey.pem:
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]:cn
State or Province Name (full name) [Some-State]:Asia
Locality Name (eg, city) []:bj
Organization Name (eg, company) [Internet Widgits Pty Ltd]:
Organizational Unit Name (eg, section) []:
Common Name (e.g. server FQDN or YOUR name) []:lyw
Email Address []:
 
  
 
  
 
  
 
  

 
  
4、生成user 私钥、证书。
 
  
 
  
root@ubuntu:~/certs# openssl genrsa -des3 -out userkey.pem
Generating RSA private key, 2048 bit long modulus
................................................+++
...+++
e is 65537 (0x10001)
Enter pass phrase for userkey.pem:
Verifying - Enter pass phrase for userkey.pem:
root@ubuntu:~/certs# openssl req -new -days 365 -key userkey.pem -out userreq.pem
Enter pass phrase for userkey.pem:
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]:cn
State or Province Name (full name) [Some-State]:Asia
Locality Name (eg, city) []:BJ
Organization Name (eg, company) [Internet Widgits Pty Ltd]:
Organizational Unit Name (eg, section) []:abc
Common Name (e.g. server FQDN or YOUR name) []:abc
Email Address []:

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:
root@ubuntu:~/certs# openssl ca -in userreq.pem -out usercert.pem
Using configuration from /usr/lib/ssl/openssl.cnf
Enter pass phrase for ./demoCA/private/cakey.pem:
Check that the request matches the signature
Signature ok
Certificate Details:
        Serial Number: 1 (0x1)
        Validity
            Not Before: Jul 17 19:14:18 2015 GMT
            Not After : Jul 16 19:14:18 2016 GMT
        Subject:
            countryName               = cn
            stateOrProvinceName       = Asia
            organizationName          = Internet Widgits Pty Ltd
            organizationalUnitName    = abc
            commonName                = abc
        X509v3 extensions:
            X509v3 Basic Constraints: 
                CA:FALSE
            Netscape Comment: 
                OpenSSL Generated Certificate
            X509v3 Subject Key Identifier: 
                DE:90:9F:7B:A3:58:0C:D4:32:5A:2E:E0:40:BC:6B:25:3B:F9:3D:28
            X509v3 Authority Key Identifier: 
                keyid:DD:E5:B1:AA:36:1F:F2:95:A8:0A:DD:51:2E:3D:BB:9A:F3:7B:8C:57

Certificate is to be certified until Jul 16 19:14:18 2016 GMT (365 days)
Sign the certificate? [y/n]:y


1 out of 1 certificate requests certified, commit? [y/n]y
Write out database with 1 new entries
Data Base Updated
 
  
 5. 生成server 私钥与证书 
  
 
  
 
  
openssl genrsa -des3 -out serverkey.pem
Generating RSA private key, 2048 bit long modulus
.........................................................................................+++
....+++
e is 65537 (0x10001)
Enter pass phrase for serverkey.pem:
Verifying - Enter pass phrase for serverkey.pem:
root@ubuntu:~/certs# openssl req -new -days 365 -key serverkey.pem -out serverreq.pem
Enter pass phrase for serverkey.pem:
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]:cnState or Province Name (full name) [Some-State]:AsiaLocality Name (eg, city) []:BJOrganization Name (eg, company) [Internet Widgits Pty Ltd]:Organizational Unit Name (eg, section) []:Common Name (e.g. server FQDN or YOUR name) []:lywEmail Address []:Please enter the following 'extra' attributesto be sent with your certificate requestA challenge password []:An optional company name []:root@ubuntu:~/certs# openssl ca -in serverreq.pem -out servercert.pemUsing configuration from /usr/lib/ssl/openssl.cnfEnter pass phrase for ./demoCA/private/cakey.pem:Check that the request matches the signatureSignature okCertificate Details: Serial Number: 2 (0x2) Validity Not Before: Jul 17 19:25:24 2015 GMT Not After : Jul 16 19:25:24 2016 GMT Subject: countryName = cn stateOrProvinceName = Asia organizationName = Internet Widgits Pty Ltd commonName = lyw X509v3 extensions: X509v3 Basic Constraints: CA:FALSE Netscape Comment: OpenSSL Generated Certificate X509v3 Subject Key Identifier: 5D:F4:01:21:6A:2D:28:58:24:0E:DC:66:10:4D:65:40:72:C4:04:22 X509v3 Authority Key Identifier: keyid:DD:E5:B1:AA:36:1F:F2:95:A8:0A:DD:51:2E:3D:BB:9A:F3:7B:8C:57Certificate is to be certified until Jul 16 19:25:24 2016 GMT (365 days)Sign the certificate? [y/n]:y1 out of 1 certificate requests certified, commit? [y/n]yWrite out database with 1 new entriesData Base Updated
 
  
 
  
 
  
 二、apache服务器。 
  
 
  
首先装apache。更改配置文件 /usr/local/apache2/conf/extra/httpd-ssl.conf
 
  
更改：
 
  
 
  
SSLCertificateFile "/root/certs/server.crt"
 
  
SSLCertificateKeyFile "/root/certs/server.key"
 
  
SSLCACertificatePath "/root/certs/demoCA/"
SSLCACertificateFile "/root/certs/demoCA/cacert.pem"
 
  

 
  
启动apache服务器。
 
  

 
  
/usr/local/apache2/bin/apachectl start
httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
Apache/2.2.29 mod_ssl/2.2.29 (Pass Phrase Dialog)
Some of your private key files are encrypted for security reasons.
In order to read them you have to provide the pass phrases.

Server lyw:443 (RSA)
Enter pass phrase:

OK: Pass Phrase Dialog successful.
 
  
 
  
 
  
 为客户生成可以导入浏览器的格式。 
  
 
  
 
  
openssl pkcs12 -export -clcerts -in usercert.pem -inkey userkey.pem  -out user.p12
Enter pass phrase for userkey.pem:
Enter Export Password:
Verifying - Enter Export Password:
 
  
 
  
不导入证书时访问。
 
  

 
  

 将user.p12导入浏览器。 
  

 
  
此时可以查看证书的信息，和生成证书请求时填的信息一样，点击确定。

 
  
 
  
由于此证书的颁发者不是浏览器信任的CA，所以会有这个告警，点击高级，继续前往。
 
  

 
  

 
  
至此，已经可以使用自己生成的CA、客户端证书访问服务器了。
 
  
当然要设置本地Host文件。
 
  
下一节，我们根据ssl访问过程分析SSL原理。
 
  
参考：http://netkiller.github.io/cryptography/openssl/email.html