cntlm 是一個(gè)HTTP二級(jí)代理軟件宇弛。 它主要的作用鸡典，是在能代理上網(wǎng)的前提下，給這個(gè)代理再做一個(gè)代理枪芒，提供給更多的下級(jí)用戶彻况。 下級(jí)用戶不需要、也不可能知道代理的賬戶密碼舅踪，這樣既保障了安全疗垛、又實(shí)現(xiàn)了方便。
背景介紹
公司內(nèi)部提供代理上網(wǎng)硫朦，但需要登錄贷腕。考慮到y(tǒng)um咬展、http_proxy等方式使用時(shí)會(huì)存在密碼泄露風(fēng)險(xiǎn)泽裳，故采用 cntlm 做一個(gè)二級(jí)代理，方便使用破婆。cntlm 具有以下優(yōu)勢：
- 密碼密文
- 可以設(shè)置黑白名單
- 輕量級(jí)涮总、安裝配置簡單
安裝方式：編譯安裝
下載地址:
配置文件樣例
#
# Cntlm Authentication Proxy Configuration
#
# NOTE: all values are parsed literally, do NOT escape spaces,
# do not quote. Use 0600 perms if you use plaintext password.
#
Username xxxx
Domain xxxx
#Password xxxxx
# NOTE: Use plaintext password only at your own risk
# Use hashes instead. You can use a "cntlm -M" and "cntlm -H"
# command sequence to get the right config for your environment.
# See cntlm man page
# Example secure config shown below.
# PassLM 1AD35398BE6565DDB5C4EF70C0593492
# PassNT 77B9081511704EE852F94227CF48A793
### Only for user 'testuser', domain 'corp-uk'
# PassNTLMv2 D5826E9C665C37C80B53397D5C07BBCB
# Specify the netbios hostname cntlm will send to the parent
# proxies. Normally the value is auto-guessed.
#
# Workstation netbios_hostname
# List of parent proxies to use. More proxies can be defined
# one per line in format <proxy_ip>:<proxy_port>
#
#Proxy 10.0.0.41:8080
Proxy proxy.xxx.com:8080
# List addresses you do not want to pass to parent proxies
# * and ? wildcards can be used
#
NoProxy localhost, 127.0.0.*, 10.*, 192.168.*
# Specify the port cntlm will listen on
# You can bind cntlm to specific interface by specifying
# the appropriate IP address also in format <local_ip>:<local_port>
# Cntlm listens on 127.0.0.1:3128 by default
#
Listen 50000
# If you wish to use the SOCKS5 proxy feature as well, uncomment
# the following option. It can be used several times
# to have SOCKS5 on more than one port or on different network
# interfaces (specify explicit source address for that).
#
# WARNING: The service accepts all requests, unless you use
# SOCKS5User and make authentication mandatory. SOCKS5User
# can be used repeatedly for a whole bunch of individual accounts.
#
#SOCKS5Proxy 8010
#SOCKS5User dave:password
# Use -M first to detect the best NTLM settings for your proxy.
# Default is to use the only secure hash, NTLMv2, but it is not
# as available as the older stuff.
#
# This example is the most universal setup known to man, but it
# uses the weakest hash ever. I won't have it's usage on my
# conscience. :) Really, try -M first.
#
Auth NTLM
#Flags 0x06820000
# Enable to allow access from other computers
#
Gateway yes
# Useful in Gateway mode to allow/restrict certain IPs
# Specifiy individual IPs or subnets one rule per line.
#
Allow 127.0.0.1
Allow 192.168.3.0/24
Allow 10.10.4.0/24
Deny 0/0
# GFI WebMonitor-handling plugin parameters, disabled by default
#ISAScannerSize 1024
#ISAScannerAgent Wget/
#ISAScannerAgent APT-HTTP/
#ISAScannerAgent Yum/
# Headers which should be replaced if present in the request
#
#Header User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows 98)
# Tunnels mapping local port to a machine behind the proxy.
# The format is <local_port>:<remote_host>:<remote_port>
#
#Tunnel 11443:remote.com:443
NTLM xxxxxxxxxxxxxxxxxxx
啟動(dòng)方式
cntlm -c /etc/cntlm.conf
檢測配置是否正確
cntlm -c /etc/cntlm.conf -v
生成NTLM密碼
提取以下內(nèi)容：
Proxy-Authorization => NTLM TlRMTVNTUAABAAAABbIIogsACwAsAAAADAAMACAAAABZVU5ZSVlVQU4tREJORVVTT0ZULkNPTQ==
cntlm -vc /etc/cntlm.conf -M http://baidu.com
