感谢大牛的技术分享，本文参照：http://blog.csdn.net/kunoy/article/details/8239653，进行，并修正为自己的配置，本文为双向验证的配置。
配置环境
系统：centos6.5
nginx:1.6.2（安装通过yum安装，添加源，这个是stable`稳定版本`，http://nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-6-0.el6.ngx.noarch.rpm）
开始配置
nginx配置文件位置:
> /etc/nginx/conf.d/example_ssl.conf
修改/etc/nginx/conf.d/example_ssl.conf
注：/etc/nginx/conf.d/example_ssl.conf是被/etc/nginx/nginx.conf包含到自身的一个文件。

改为内容如下

#HTTP-SERVER 
server {  
        listen       443;  
        server_name  localhost;  
        ssi on;  
        ssi_silent_errors on;  
        ssi_types text/shtml;  
  
        ssl                  on;  
        ssl_certificate      /etc/nginx/ca/server/server.crt;  
        ssl_certificate_key  /etc/nginx/ca/server/server.key;  
        ssl_client_certificate /etc/nginx/ca/private/ca.crt;  
  
        ssl_session_timeout  5m;  
        ssl_verify_client on;  
  
        ssl_protocols  SSLv2 SSLv3 TLSv1;  
        ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;  
        ssl_prefer_server_ciphers   on;  
      
        location / {
           root   /usr/share/nginx/html;
           index  index.html index.htm;
      }

 }

签发证书

创建配置文件/etc/nginx/ca/conf/openssl.conf

[ ca ]
default_ca      = foo                   # The default ca section
 
[ foo ]
dir            = /etc/nginx/ca         # top dir
database       = /etc/nginx/ca/index.txt          # index file.
new_certs_dir  = /etc/nginx/ca/newcerts           # new certs dir
 
certificate    = /etc/nginx/ca/private/ca.crt         # The CA cert
serial         = /etc/nginx/ca/serial             # serial no file
private_key    = /etc/nginx/ca/private/ca.key  # CA private key
RANDFILE       = /etc/nginx/ca/private/.rand      # random number file
 
default_days   = 365                     # how long to certify for
default_crl_days= 30                     # how long before next CRL
default_md     = md5                     # message digest method to use
unique_subject = no                      # Set to 'no' to allow creation of
                                         # several ctificates with same subject.
policy         = policy_any              # default policy
 
[ policy_any ]
countryName = match
stateOrProvinceName = match
organizationName = match
organizationalUnitName = match
localityName            = match
commonName              = match
emailAddress            = match

在/etc/niginx/ca 下 创建文件new_ca.sh       ,执行生成根证书

#!/bin/sh
# Generate the key.
openssl genrsa -out private/ca.key
# Generate a certificate request.
openssl req -new -key private/ca.key -out private/ca.csr
# Self signing key is bad... this could work with a third party signed key... registeryfly has them on for $16 but I'm too cheap lazy to get one on a lark.
# I'm also not 100% sure if any old certificate will work or if you have to buy a special one that you can sign with. I could investigate further but since this
# service will never see the light of an unencrypted Internet see the cheap and lazy remark.
# So self sign our root key.
openssl x509 -req -days 365 -in private/ca.csr -signkey private/ca.key -out private/ca.crt
# Setup the first serial number for our keys... can be any 4 digit hex string... not sure if there are broader bounds but everything I've seen uses 4 digits.
echo FACE > serial
# Create the CA's key database.
touch index.txt
# Create a Certificate Revocation list for removing 'user certificates.'
openssl ca -gencrl -out /etc/nginx/ca/private/ca.crl -crldays 7 -config "/etc/nginx/ca/conf/openssl.conf"

# Create us a key. Don't bother putting a password on it since you will need it to start apache. If you have a better work around I'd love to hear it.
openssl genrsa -out server/server.key
# Take our key and create a Certificate Signing Request for it.
openssl req -new -key server/server.key -out server/server.csr
# Sign this bastard key with our bastard CA key.
openssl ca -in server/server.csr -cert private/ca.crt -keyfile private/ca.key -out server/server.crt -config "/etc/nginx/ca/conf/openssl.conf"

在/etc/niginx/ca 下 创建文件new_user.sh       ,执行生成客户端证书

#!/bin/sh
# The base of where our SSL stuff lives.
base="/etc/nginx/ca"
# Were we would like to store keys... in this case we take the username given to us and store everything there.
mkdir -p $base/users/

# Let's create us a key for this user... yeah not sure why people want to use DES3 but at least let's make us a nice big key.
openssl genrsa -des3 -out $base/users/client.key 1024
# Create a Certificate Signing Request for said key.
openssl req -new -key $base/users/client.key -out $base/users/client.csr
# Sign the key with our CA's key and cert and create the user's certificate out of it.
openssl ca -in $base/users/client.csr -cert $base/private/ca.crt -keyfile $base/private/ca.key -out $base/users/client.crt -config "/etc/nginx/ca/conf/openssl.conf"

# This is the tricky bit... convert the certificate into a form that most browsers will understand PKCS12 to be specific.
# The export password is the password used for the browser to extract the bits it needs and insert the key into the user's keychain.
# Take the same precaution with the export password that would take with any other password based authentication scheme.
openssl pkcs12 -export -clcerts -in $base/users/client.crt -inkey $base/users/client.key -out $base/users/client.p12

nginx配置ssh