FTP（四）实现FTP，SSL加密

查看是否支持SSL

ldd `which vsftpd`
查看是否调用这个库：libssl.so 

例如:
[root@centos6 ~]# ldd `which vsftpd`
    linux-vdso.so.1 =>  (0x00007fff482e6000)
    "libssl.so.10 => /usr/lib64/libssl.so.10 (0x00007f9c95521000)"  #就是这个
    libwrap.so.0 => /lib64/libwrap.so.0 (0x00007f9c95316000)
    libnsl.so.1 => /lib64/libnsl.so.1 (0x00007f9c950fc000)
    libpam.so.0 => /lib64/libpam.so.0 (0x00007f9c94eee000)
    libcap.so.2 => /lib64/libcap.so.2 (0x00007f9c94cea000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007f9c94ae5000)
    libc.so.6 => /lib64/libc.so.6 (0x00007f9c94751000)
    libcrypto.so.10 => /usr/lib64/libcrypto.so.10 (0x00007f9c9436c000)
    libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x00007f9c94127000)
    libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007f9c93e40000)
    libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007f9c93c3c000)
    libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007f9c93a0f000)
    libz.so.1 => /lib64/libz.so.1 (0x00007f9c937f9000)
    libaudit.so.1 => /lib64/libaudit.so.1 (0x00007f9c935d5000)
    libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007f9c9339d000)
    libattr.so.1 => /lib64/libattr.so.1 (0x00007f9c93198000)
    /lib64/ld-linux-x86-64.so.2 (0x000000319d000000)
    libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00007f9c92f8d000)
    libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007f9c92d89000)
    libresolv.so.2 => /lib64/libresolv.so.2 (0x00007f9c92b6f000)
    libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f9c92952000)
    libfreebl3.so => /lib64/libfreebl3.so (0x00007f9c9274e000)
    libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f9c9252f000)

创建自签名证书

    cd /etc/pki/tls/certs/
1，生成自签名证书
    make vsftpd.pem
2，查看自签名证书
    openssl  x509 -in vsftpd.pem -noout -text

更改vsftpd服务配置文件让FTP支持SSL加密功能

    vim/etc/vsftpd/vsftpd.conf 
    # 在配置文件中添加下面几行配置
    ssl_enable=YES                                           启用SSL 
    allow_anon_ssl=NO                                     匿名不支持SSL 
    force_local_logins_ssl=YES                        本地用户登录加密 
    force_local_data_ssl=YES                          本地用户数据传输加密
    rsa_cert_file=/etc/pki/tls/certs/vsftpd.pem   指定CA证书文件 

用filezilla等工具测试

去官网下载：https://filezilla-project.org/

这是windowns工具




出现下面这个就表示加密成功