FTP(三）vsftp + ssl搭建安全ftp服务

Posted 2020-09-24

一、背景

    ftp是一个古老协议，明文传输数据，所以为了安全需要结合ssl证书加密通讯 。本文是继上两篇的扩展优化。

二、创建本地ssl证书

#(umask 077;openssl genrsa -out /etc/vsftpd/ftpkey.pri 2048)

#openssl req -new -key /etc/vsftpd/ftpkey.pri -out /etc/vsftpd/ftpreq.csr

# (umask 077;openssl genrsa -out /etc/vsftpd/ftpkey.pri 2048)

Generating RSA private key, 2048 bit long modulus

..............................................................+++

............+++

e is 65537 (0x10001)

]# openssl req -new -key /etc/vsftpd/ftpkey.pri -out /etc/vsftpd/ftpreq.csr

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) [XX]:CN

State or Province Name (full name) []:ShangHai

Locality Name (eg, city) [Default City]:xuihui

Organization Name (eg, company) [Default Company Ltd]:testkey

Organizational Unit Name (eg, section) []:testkey

Common Name (eg, your name or your server‘s hostname) []:192.168.10.168

Email Address []:[email protected]

Please enter the following ‘extra‘ attributes

to be sent with your certificate request

A challenge password []:

An optional company name []:

#(umask 077;openssl genrsa -out /etc/pki/CA/private/cakey.pem 2048)

openssl req -new -x509 -key /etc/pki/CA/private/cakey.pem -out /etc/pki/CA/cacert.pem -days 3650

touch /etc/pki/CA/index.txt

echo "01" >/etc/pki/CA/serial

openssl ca -in /etc/vsftpd/ftpreq.csr -out /etc/vsftpd/certftp.crt -days 3650

三、vsftpd.conf配置

cat /etc/vsftpd/vsftpd.conf |egerp -v  ‘(^$|^#)‘

#数据连接侦听端口
listen_port=10021
#禁止匿名用户访问
anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
xferlog_enable=YES
xferlog_std_format=YES
xferlog_file=/var/log/xferlog
dual_log_enable=YES
vsftpd_log_file=/var/log/vsftpd.log
connect_from_port_20=YES
chroot_list_enable=YES
chroot_list_file=/etc/vsftpd/chroot_list
listen=YES
max_clients=20
max_per_ip=2
local_max_rate=409600
pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES
pasv_enable=YES
pasv_min_port=65530
pasv_max_port=65535
#证书位置
rsa_cert_file=/etc/vsftpd/certftp.crt 
rsa_private_key_file=/etc/vsftpd/ftpkey.pri
#开启ssl
ssl_enable=YES
allow_anon_ssl=NO
ssl_tlsv1=YES
ssl_sslv2=YES
ssl_sslv3=YES
#强制使用ssl安全连接
force_local_data_ssl=YES
force_local_logins_ssl=YES
require_ssl_reuse=NO
ssl_ciphers=HIGH

#重启vsftpd，看上去没有什么变化，连接访问时如下：

这时候客户端和ftp之间的连接通讯和数据传输都是ssl加密连接传输。可以通过抓包工具验证！

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