不知不觉中，疫情已经来到第三个年头，居家办公逐渐成为常态；但大多企业内部系统（如 OA、ERP、CRM）要么位于本地局域网，要么白名单访问；而现在的家庭宽带获取 IP 变动频繁甚至没有公网 IP，如何更稳定的保证外勤员工都能使用这些系统是重中之重。

防火墙

放行或者关闭防火墙

  1. systemctl stop firewalld
  2. systemctl disable firewalld
  3. setenforce 0

点对点

一台固定公网 IP 的（VPS）服务器搭建相应的服务即可，客户端与服务器之间建立链路，客户端通过服务器网络访问企业内部 OA、ERP、CRM 等系统（添加服务器 IP 到白名单）

Dante

服务部署

http://www.inet.no/dante/download.html

  1. yum install epel-release
  2. rpm -ivh  https://dl.fedoraproject.org/pub/epel/7Server/x86_64/Packages/e/epel-release-7-13.noarch.rpm

编译安装

  1. yum -y install gcc openssl-devel pcre-devel zlib-devel libtool c++ pam-devel pam
  2. wget ftp://ftp.inet.no/pub/socks/dante-1.4.3.tar.gz && tar xvzf dante-1.4.3.tar.gz && cd dante-1.4.3
  3. ./configure && make && make install

RPM 安装

  1. rpm -ivh https://mirror.ghettoforge.org/distributions/gf/el/7/plus/x86_64/dante-1.4.1-176.9.x86_64.rpm # 安装 dante
  2. rpm -ivh https://mirror.ghettoforge.org/distributions/gf/el/7/plus/x86_64/dante-server-1.4.1-176.9.x86_64.rpm # 安装 dante-server

服务配置

需要授权账号

  1. useradd  -s /sbin/nologin socker
  2. passwd socker
  3. mkdir /var/run/sockd

vim /etc/sockd.conf，详细说明见《官方文档》

  1. #logging
  2. errorlog: /var/log/sockd-error.log
  3. logoutput: /var/log/sockd.log
  4. #debug: 2
  6. #server address specification
  7. internal: eth0 port = 1080
  8. external: eth0
  10. #server identities (not needed on solaris)
  11. #user.privileged: root
  12. user.notprivileged: socker
  13. #user.libwrap: libwrap
  15. #reverse dns lookup
  16. #srchost: nodnsmismatch
  18. #authentication methods
  19. clientmethod: none
  20. socksmethod: none
  22. ##
  23. ## SOCKS client access rules
  24. ##
  25. #rule processing stops at the first match, no match results in blocking
  27. #block access to socks server from 192.0.2.22 (exception for pass rule below)
  28. # client block {
  29. #       #block connections from 192.0.2.22/32
  30. #       from: 192.0.2.22/24 to: 0.0.0.0/0
  31. #       log: error # connect disconnect
  32. # }
  34. #allow connections from local network (192.0.2.0/24)
  35. client pass {
  36.         from: 192.0.2.0/24 to: 0.0.0.0/0
  37.     log: error # connect disconnect
  38. }
  40. ##
  41. ## SOCKS command rules
  42. ##
  43. #rule processing stops at the first match, no match results in blocking
  45. #block communication with www.example.org
  46. # socks block {
  47. #        from: 0.0.0.0/0 to: www.example.org
  48. #        command: bind connect udpassociate
  49. #        log: error # connect disconnect iooperation
  50. # }
  52. #generic pass statement - bind/outgoing traffic
  53. socks pass {  
  54.         from: 0.0.0.0/0 to: 0.0.0.0/0
  55.         command: bind connect udpassociate
  56.         log: error # connect disconnect iooperation
  57. }
  59. #block incoming connections/packets from ftp.example.org 
  60. # socks block {
  61. #        from: ftp.example.org to: 0.0.0.0/0
  62. #        command: bindreply udpreply
  63. #        log: error # connect disconnect iooperation
  64. # }
  66. #generic pass statement for incoming connections/packets
  67. socks pass {
  68.         from: 0.0.0.0/0 to: 0.0.0.0/0
  69.         command: bindreply udpreply
  70.         log: error # connect disconnect iooperation
  71. }

使用/usr/local/sbin/sockd -f /etc/sockd.conf命令运行

系统服务

vim /usr/lib/systemd/system/sockd.service

  1. [Unit]
  2. Description=scokd
  3. After=network.target remote-fs.target nss-lookup.target
  5. [Service]
  6. Type=forking
  7. ExecStart=/usr/local/sbin/sockd -f /etc/sockd.conf
  8. ExecReload=kill -HUP `cat /var/run/sockd.pid`
  9. ExecStop=kill -9 `cat /var/run/sockd.pid`
  11. [Install]
  12. WantedBy=multi-user.target

alert: run_request(): mother unexpectedly closed the IPC control channel: mother unexpectedly exited

服务日志

  1. tail -f /var/log/sockd-error.log

Squid

  • 传统代理：适用于 Internet，需在客户机指定代理服务器的地址和端口
  • 透明代理：
  • 反向代理：

    服务部署

    1. #安装
    2. yum install -y squid
    3. #设置开机启动
    4. systemctl enable squid
    5. #启动服务
    6. systemctl start squid

    服务配置

    vim /etc/squid/squid.conf修改服务配置，如 acl 规则、服务端口http_port等 ```bash #

    Recommended minimum configuration:

    #

Example rule allowing access from your local networks.

Adapt to list your (internal) IP networks from where browsing

should be allowed

acl localnet src 10.0.0.0/8 # RFC1918 possible internal network acl localnet src 172.16.0.0/12 # RFC1918 possible internal network acl localnet src 192.168.0.0/16 # RFC1918 possible internal network acl localnet src fc00::/7 # RFC 4193 local private network range acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT

#

Recommended minimum Access Permission configuration:

#

Deny requests to certain unsafe ports

http_access deny !Safe_ports

Deny CONNECT to other than secure SSL ports

http_access deny CONNECT !SSL_ports

Only allow cachemgr access from localhost

http_access allow localhost manager http_access deny manager

We strongly recommend the following be uncommented to protect innocent

web applications running on the proxy server who think the only

one who can access services on “localhost” is a local user

http_access deny to_localhost

#

INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS

#

Example rule allowing access from your local networks.

Adapt localnet in the ACL section to list your (internal) IP networks

from where browsing should be allowed

http_access allow localnet http_access allow localhost

And finally deny all other access to this proxy

http_access deny all

http_access allow all

Squid normally listens to port 3128

http_port 10000

Uncomment and adjust the following to add a disk cache directory.

cache_dir ufs /var/spool/squid 100 16 256

Leave coredumps in the first cache dir

coredump_dir /var/spool/squid

#

Add any of your own refresh_pattern entries above these.

# refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern . 0 20% 4320

  1. 修改完配置需要`systemctl restart squid`重启服务，不想访问的时候关闭服务即可
  2. <a name="RTavN"></a>
  3. ### 服务日志
  4. ```bash
  5. tail -f /var/log/squid/access.log

点对站

对于需要访问本地文件服务器、局域网其他资源的需求；点对站则是在点对点的基础上扩展而来，即服务需要部署在局域网内部服务器或者路由器网关上

IPsec

站对站

此类方案用于多地办公室组网、资源互通，从点对站升级而来；有钱的企业可以直接上BGP 组网，小公司性价比就不是很高了

ZeroTier

https://www.zerotier.com/

WireGuard

https://www.wireguard.com/
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