如何在 Cache Engine 中配置 TACACS+ 支持

简介

本文档介绍如何配置终端访问控制器访问控制系统Plus(TACACS+)支持以访问思科缓存引擎。本文档中的说明允许您在telnet至缓存引擎时根据远程TACACS+服务器/数据库进行验证。如果服务器不包含您的用户ID的条目，它会在本地检查是否有效的访问信息。

先决条件

要求

本文档没有任何特定的要求。

使用的组件

本文档中的信息基于以下软件和硬件版本：

• 在实验室环境中的已清除配置的Cisco Cache Engine 505

• 思科缓存引擎软件版本2.3.1

• 适用于UNIX的CiscoSecure

本文档中的信息都是基于特定实验室环境中的设备编写的。本文档中使用的所有设备最初均采用原始（默认）配置。如果您使用的是真实网络，请确保您已经了解所有命令的潜在影响。

规则

关于文件规则的信息，请参见Cisco技术提示规则。

配置

本部分提供有关如何配置本文档所述功能的信息。

注意：使用命令查找工具(仅限注册客户)可获取有关本节中使用的命令的详细信息。

网络图

本文档使用以下网络设置：

为TACACS+支持配置缓存引擎

要为TACACS+支持配置缓存引擎，请完成以下步骤：

1. 为Web缓存通信协议(WCCP)的相应版本配置缓存引擎。

2. 对默认配置使用以下命令：

   authentication login local enable
   authentication configuration local enable
   

3. 配置TACACS+服务器IP地址。如果多台服务器指定哪个地址是主地址，则辅助服务器将留空选项。

4. 将TACACS+服务器的身份验证配置为主服务器。如果服务器不可用，则默认为本地指定的身份验证。

5. 根据需要配置对TACACS+密钥信息的身份验证。

注意：您必须在思科缓存引擎上启用TACACS+，因为思科缓存引擎使用PPP来向TACACS服务器进行身份验证，而不是不需要PPP的路由器。要在Cisco缓存引擎上启用TACACS+，请打开Cisco Secure ACS 2.6，单击Group Setup选项卡，然后选中TACACS+ Settings区域中的PPP IP 复选框。

您的命令行应类似于以下输出：

cepro(config)#tacacs server 172.18.124.114
cepro(config)#authentication login tacacs ena primary
cepro(config)#authen configuration tacacs enab

验证

使用本部分可确认配置能否正常运行。

命令输出解释程序（仅限注册用户）(OIT) 支持某些 show 命令。使用 OIT 可查看对 show 命令输出的分析。

• show version — 显示在缓存引擎上运行的软件以及一些其他组件作为系统正常运行时间（例如之前引导代码的位置和编译代码的日期）。

  cepro#show version
  Cisco Cache Engine
  Copyright (c) 1986-2001 by Cisco Systems, Inc.
  Software Release: CE ver 2.31 (Build: FCS  02/16/01)
  Compiled: 11:20:14 Feb 22 2001 by bbalagot
  Image text-base 0x108000, data_base 0x437534
  
  System restarted by Reload
  The system has been up for 20 hours, 42 minutes, 59 seconds.
  System booted from "flash"

• show hardware — 显示与show version命令以及缓存引擎的硬件组件相同的信息。

  cepro#show hardware
  Cisco Cache Engine
  Copyright (c) 1986-2001 by Cisco Systems, Inc.
  Software Release: CE ver 2.31 (Build: FCS  02/16/01)
  Compiled: 11:20:14 Feb 22 2001 by bbalagot
  Image text-base 0x108000, data_base 0x437534
  
  System restarted by Reload
  The system has been up for 21 hours, 15 minutes, 16 seconds.
  System booted from "flash"
  
  Cisco Cache Engine CE505 with CPU AMD-K6 (model 8) (rev. 12) AuthenticAMD
  2 Ethernet/IEEE 802.3 interfaces
  1 Console interface.
  134213632 bytes of Physical Memory
  131072 bytes of ROM memory.
  8388608 bytes of flash memory.
  
  List of disk drives:
       /c0t0d0  (scsi bus 0, unit 0, lun 0)

• show running-config — 显示缓存引擎上的运行配置。

  cepro#show running-config
  
  Building configuration...
  Current configuration:
  !
  !
  !
  user add admin uid 0  password 1 "eeSdy9dcy"  capability admin-access
  user add chbanks uid 5001  password 1 "eeSdy9dcy"  capability admin-access
  !
  !
  !
  hostname cepro
  !
  interface ethernet 0
   ip address 10.27.2.2 255.255.255.0
   ip broadcast-address 10.27.2.255
  exit
  !
  !
  interface ethernet 1
  exit
  !
  ip default-gateway 10.27.2.1
  ip route 0.0.0.0 0.0.0.0 10.27.2.1
  cron file /local/etc/crontab
  !
  wccp router-list 1 10.27.2.1
  wccp web-cache router-list-num 1
  !
  authentication login tacacs enable primary
  authentication login local enable !--- on by default ---!
  authentication configuration tacacs enable
  authentication configuration local enable  !---- on by default ---!
  tacacs server 172.18.124.114 primary
  rule no-cache url-regex .*cgi-bin.*
  rule no-cache url-regex .*aw-cgi.*
  !
  !
  end
  cepro#
  

• show tacacs — 显示TACACS+服务器的设置。

  cepro#show tacacs
      Login Authentication for Console/Telnet Session: enabled (primary)
      Configuration Authentication for Console/Telnet Session: enabled
  
      TACACS Configuration:
      ---------------------
      Key        =
      Timeout    = 5 seconds
      Retransmit = 2 times
  
      Server                         Status
      ----------------------------   ------
      172.18.124.114                 primary
  

• show statistics tacacs — 显示TACACS+统计信息。

  cepro#show statistics tacacs
      TACACS+ Statistics
      -----------------
      Number of access requests: 13
      Number of access deny responses: 7
      Number of access allow responses: 0
  

• show authentication — 显示当前TACACS+当前身份验证和授权配置。

  cepro#show authentication
  Login Authentication:         Console/Telnet Session
  ----------------------------- -----------------------
  local                         enabled
  tacacs                        enabled (primary)
  
  Configuration Authentication: Console/Telnet Session
  ----------------------------- -----------------------
  local                         enabled
  tacacs                        enabled
  
  cepro#

故障排除命令

本部分提供的信息可用于对配置进行故障排除。

命令输出解释程序（仅限注册用户）(OIT) 支持某些 show 命令。使用 OIT 可查看对 show 命令输出的分析。

注意：在使用debug命令之前，请参阅有关Debug命令的重要信息。

• show debug — 显示已启用的debug命令。

  cepro#show debug
  Authentication debugging is on
  Tacacs debugging is on
  

• terminal monitor — 将调试输出显示到屏幕。此输出显示debug authentication和debug tacacs命令的结果。

  cepro#terminal monitor
  cepro#authenticateUser(): Begin
  setRemoteIPAddress(): pRemoteAddress 172.18.124.193
  bAuthentication(): Begin
  bAuthenticationIntersection(): Begin
  bAuthenticationIntersection(): telnet_access 1
  setAuthenticatedService(): nServiceToAuthenticate 6
  getAuthenticatedService(): Begin
  getAuthenticatedService(): nServiceToAuthenticate = 6
  bAuthenticationIntersection() getAuthenticatedService 6
  setErrorDisplayed(): Begin bStatus 0
  getLocalLoginAuthEnable(): Begin
  getLocalLoginAuthEnable(): uiState = 1
  getTacacsLoginAuthEnable(): Begin
  getTacacsLoginAuthEnable(): uiState = 1
  getTacacsLoginAuthPrimary(): Begin
  getTacacsLoginAuthPrimary(): uiState = 1
  IncrementTacacsStatRequest(): Begin
  tacacs_plus_login() Begin
  isConsole() Begin
  getAuthenticatedService(): Begin
  getAuthenticatedService(): nServiceToAuthenticate = 6
  isConsole() nReturn 0 telnet
  tacacs_plus_login() sWhatService() tty = telnet
  getRemoteIPAddress(): Begin
  getRemoteIPAddress(): pRemoteAddress = 172.18.124.193
  tacacs_plus_login() getRemoteIPAddress sHostIp 172.18.124.193
  tacacs_malloc() Begin 164
  tacacs_malloc() PSkmalloc ptr
  getUserStruct() malloc_named ustr
  tacacs_plus_login() allocated memory for ustruct
  aaa_update_user() Begin
  debug_authen_svc() Begin
  
  aaa_update_user(): user='admin' ruser='system' port='telnet' 
      rem_addr='172.18.124.193' authen_type=1
  tacacs_plus_login() updated user
  getNumTacacsLoginAttempts(): Begin
  getNumTacacsLoginAttempts(): ulRetransmit = 2
  ####### tacacs_plus_login() num_tries 1
  aaa_start_login() Begin
  debug_start_login() Begin
  
  debug_start_login()/AUTHEN/START (0): port='telnet' list='(null)' 
      action=LOGIN service=LOGIN
  aaa_randomize_id() Begin
  tacacs_plus_start_login() Begin
  tacacs_parse_server() Begin user_str admin
  getTacacsDirectRequestEnable(): Begin
  getTacacsDirectRequestEnable(): cDirectRequestEnable = 0
  printIpAddr() Begin
  printIpAddr() 0.0.0.0
  tacacs_plus_start_login() server.ip_addr 0.0.0.0          server.type 
      0 server.length 0
  choose_version() Begin
  create_authen_start() Begin
  create_authen_start() len 45
  tacacs_malloc() Begin 45
  tacacs_malloc() PSkmalloc ptr
  create_authen_start() malloc_named tac_pak
  fill_tacacs_plus_hdr() Begin encrypt 1
  fill_tacacs_plus_hdr() len 33, tac_pak->length 33
  #### fill_tacacs_plus_hdr() tac_pak->encrypted 1
  #### fill_tacacs_plus_hdr() TEST nTestLen 33
  create_authen_start() len 33, tac_pak->length 33
  create_authen_start() u->priv_lvl  15 start->priv_lvl 15
  create_authen_start() start->action 1
  create_authen_start() start->authen_type 1
  create_authen_start() start->service 1
  create_authen_start() user_len 5
  create_authen_start() port_len 6
  create_authen_start() addr_len 14
  create_authen_start() out_len 33
  tacacs_plus_start_login() TACACS+: send AUTHEN/START packet ver=192 
      id=1541646967
  tacacs_plus_start_login() login to TACACS+ server:
  printIpAddr() Begin
  printIpAddr() 0.0.0.0
  tacacs_plus_get_conn() Begin server(0)
  printIpAddr() Begin
  printIpAddr() 0.0.0.0
  tacacs_plus_get_conn() **pSocketHandleIndex 89434348
  tacacs_plus_get_conn() Look at server in the TACACS+ server list
  tacacs_plus_get_conn() TACACS+: This is a loop through server list
  tacacs_plus_openconn() Begin
  printIpAddr() Begin
  printIpAddr() 172.18.124.114
  open_handle() Begin
  tacacs_plus_socket() Begin
  tacacs_plus_socket Socket: return nSocket 784 nSockFdTbl[28] = 784
  printIpAddr() Begin
  printIpAddr() 172.18.124.114
  open_handle() TACACS+: Opening TCP/IP connection to 172.18.124.114
  open_handle() nSockFdTbl[28]= 784
  setCurrentServer() Begin SaveCurrentServer->ip_addr 172.18.124.114
  IncrementTacacsStatPerServerRequest(): Begin
  ##### IncrementTacacsStatPerServerRequest  Server->ip_addr 1920733868 
      tacacs_root.ulTacacsServerAddr
  open_handle() socket(28) 784
  tacacs_plus_connect() Begin
  tacacs_plus_connect() socket(28) 784
  tacacs_plus_connect() End
  open_handle() is connected
  open_handle() *connection_handle 28
  open_handle() **pSocketHandleIndex 28
  tacacs_plus_openconn() **pSocketHandleIndex 28
  get_server() Begin
  tacacs_plus_openconn() server->opens++
  tacacs_plus_get_conn() **pSocketHandleIndex 28
  tacacs_plus_get_conn() oldServerCount: 0, count:0
   tacacs_plus_start_login() **pHandleIndex 28
  tacacs_plus_send_receive() Begin
  tacacs_plus_proc_send_receive() Begin
  tacacs_plus_proc_send_receive() length 33
  copy_tac_plus_packet() Begin
  tacacs_malloc() Begin 45
  tacacs_malloc() PSkmalloc ptr
  copy_tac_plus_packet() malloc_named copy
  tacacs_plus_encrypt() Begin
  getTacacsKey(): Begin
  getTacacsKey(): sKey =
  tacacs_plus_encrypt() key
  tacacs_plus_encrypt() sizeof(tacacs_plus_pkt_hdr) 12
  tacacs_plus_encrypt() sizeof(uchar) 1
  tacacs_plus_encrypt() tac_pak->encrypted 1
  tacacs_plus_encrypt() tac_pak->encrypted = TAC_PLUS_CLEAR && key is empty
  tacacs_plus_proc_send_receive() out_pak->encrypted 1
  tacacs_plus_proc_send_receive() out_pak->encrypted 1
  tacacs_plus_proc_send_receive() PSkfree dump_pak
  tacacs_plus_proc_send_receive() ntohl(out_pak->length) 33
  dump_start_session() Begin ntohl(out_pak->length) 33
  getTacacsKey(): Begin
  getTacacsKey(): sKey =
  0xc0 0x1 0x1 0x1 0x77 0xaa 0xe3 0x5b 0x0 0x0 0x0 0x21 0x1 0xf 0x1 0x1 0x5 
       0x6 0xe 0x0 0x61 0x64 0x6d
  encrypt_md5_xor() Begin
  encrypt_md5_xor() no key
  dump_summarise_incoming_packet_type() Begin
  Read AUTHEN/START size=45
  dump_nas_pak() Begin
  dump_header() Begin
  PACKET: key=
  version 192 (0xc0), type 1, seq no 1, encrypted 1
  session_id 2007688027 (0x77aae35b), Data length 33 (0x21)
  End header
  type=AUTHEN/START, priv_lvl = 15action=login
  authen_type=ascii
  service=login
  user_len=5 port_len=6 (0x6), rem_addr_len=14 (0xe)
  data_len=0
  User: port: rem_addr: data:
  End packet
  dump_start_session() PSkfree test
  getTacacsTimeout(): Begin
  getTacacsTimeout(): ulTimeout = 5
  tacacs_plus_sockwrite() Begin
  tacacs_plus_proc_send_receive() PSkfree out_pak
  getTacacsTimeout(): Begin
  getTacacsTimeout(): ulTimeout = 5
  sockread() Begin
  tacacs_plus_proc_send_receive() read
  tacacs_malloc() Begin 18
  tacacs_malloc() PSkmalloc ptr
  tacacs_plus_proc_send_receive() malloc_named *in
  tacacs_plus_proc_send_receive() allocated memory
  getTacacsTimeout(): Begin
  getTacacsTimeout(): ulTimeout = 5
  sockread() Begin
  tacacs_plus_proc_send_receive() OK
  tacacs_plus_decrypt() Begin
  getTacacsKey(): Begin
  getTacacsKey(): sKey =
  tacacs_plus_decrypt() key
  tacacs_plus_decrypt() tac_pak->encrypted = TAC_PLUS_CLEAR && key is empty
  authen_resp_sanity_check() Begin
  tacacs_plus_hdr_sanity_check() Begin
  authen_debug_response() Begin
  authen_debug_response() TACACS+: ver=192 id=1541646967 received AUTHEN 
      status = FAIL
  tacacs_plus_start_login() PSkfree out_tac_pak
  unload_authen_resp() Begin
  tacacs_plus_start_login() PSkfree in_tac_pak
  debug_authen_status() Begin
  
  TACACS+/AUTHEN (2007688027): status = FAIL
  
  tacacs_plus_login() Authentication failed.
  tacacs_plus_login() label1
  aaa_cleanup_login() Begin
  aaa_close_connection() Begin
  tacacs_plus_closeconn() Begin
  get_server() Begin
  close_handle() Begin
  close_handle() nHandleIndex 28 nSockFdTbl[**handle] 784
  aaa_set_password() Begin
  aaa_free_user() Begin
  debug_authen_svc() Begin
  aaa_close_connection() Begin
  
  TACACS+/AUTHEN: free user admin system telnet 172.18.124.193 
      authen_type=ASCII service=LOGIN priv_lv
  aaa_free_user() PSkfree ustr
  ####### tacacs_plus_login() num_tries 2
  aaa_start_login() Begin
  debug_start_login() Begin
  
  debug_start_login()/AUTHEN/START (0): port='unknown' list='(null)' 
      action=LOGIN service=LOGIN
  
  TACACS+/AUTHEN/START aaa_start_login() (0): ERROR (no ustruct)
      tacacs_plus_login() TACACS+: aaa_start
  aaa_free_user() Begin
  tacacs_plus_login() try_local_login AUTHENTICATION_INTERNAL_ERROR
  IncrementTacacsStatDenyAccess(): Begin
  localAuthentication(): Begin
  localAuthentication() usrName admin
  localAuthentication() passwd system
  localAuthentication() pUid 89435294
  localAuthentication() telnet_access
  localAuthentication() rc == TRUE
  AuthenticationIntersection(): bTacacsLogin 0
  IncrementLocalLoginStat(): Begin
  getLocalConfigAuthEnable(): Begin
  getLocalConfigAuthEnable(): uiState = 1
  getTacacsConfigAuthEnable(): Begin
  getTacacsConfigAuthEnable(): uiState = 1
  getTacacsConfigAuthPrimary(): Begin
  getTacacsConfigAuthPrimary(): uiState = 0
  localAuthentication(): Begin
  localAuthentication() usrName admin
  localAuthentication() passwd system
  localAuthentication() pUid 89435294
  localAuthentication() telnet_access
  localAuthentication() rc == TRUE
  AuthenticationIntersection(): bTacacsConfig 0
  AuthenticationIntersection():== Local Database Authentication ==
  IncrementLocalConfigStat(): Begin
  AuthenticationIntersection(): user has been found
  AuthenticationIntersection(): bTacacsLogin pUid 89435294
  AuthenticationIntersection(): GOT ACCESS capab 0 Admin 0 Ftp 0 Http 0 
      Telnet 0
  
  authenticateUser() AUTHENTICATION IS OK
  authenticateUser() AUTHENTICATION #2
  

相关信息

• 思科500系列缓存引擎产品和服务