如何在快取引擎上配置TACACS+支援

簡介

本文說明如何設定終端存取控制器存取控制系統Plus(TACACS+)支援，以便存取思科快取引擎。通過telnet到快取引擎時，本文檔中的說明允許您對遠端TACACS+伺服器/資料庫進行驗證。如果伺服器不包含使用者ID的條目，則它在本地檢查是否有有效的訪問資訊。

必要條件

需求

本文件沒有特定需求。

採用元件

本文中的資訊係根據以下軟體和硬體版本：

• 實驗環境下的思科快取引擎505，已清除設定

• 思科快取引擎軟體版本2.3.1

• CiscoSecure for UNIX

本文中的資訊是根據特定實驗室環境內的裝置所建立。文中使用到的所有裝置皆從已清除（預設）的組態來啟動。如果您的網路正在作用，請確保您已瞭解任何指令可能造成的影響。

慣例

請參閱思科技術提示慣例以瞭解有關檔案慣例的資訊。

設定

本節提供用於設定本文件中所述功能的資訊。

註：使用Command Lookup Tool(僅供已註冊客戶使用)可獲取本節中使用的命令的詳細資訊。

網路圖表

本檔案會使用以下網路設定：

為TACACS+支援配置快取引擎

完成以下步驟，設定快取引擎以提供TACACS+支援：

1. 為各自版本的Web Cache Communication Protocol(WCCP)配置快取引擎。

2. 使用以下命令進行預設配置：

   authentication login local enable
   authentication configuration local enable
   

3. 配置TACACS+伺服器IP地址。如果多個伺服器指定哪個地址為主地址，則輔助伺服器將保留為空白選項。

4. 將TACACS+伺服器的身份驗證配置為主身份驗證。如果伺服器不可用，則預設值為本地指定的身份驗證。

5. 必要時配置TACACS+金鑰資訊的身份驗證。

注意：您必須在思科快取引擎上啟用TACACS+，因為與不需要PPP的路由器不同，思科快取引擎使用PPP來向TACACS伺服器進行身份驗證。要在Cisco快取引擎上啟用TACACS+，請開啟Cisco Secure ACS 2.6，按一下Group Setup頁籤，然後選中TACACS+設定區域中的PPP IP覈取方塊。

您的命令列應類似於以下輸出：

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

驗證

使用本節內容，確認您的組態是否正常運作。

輸出直譯器工具(僅供已註冊客戶使用)(OIT)支援某些show命令。使用OIT檢視show命令輸出的分析。

• show version — 顯示運行在快取引擎上的軟體，以及一些其他元件，如系統正常運行時間（如代碼上次引導的位置和編譯的日期）。

  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 — 顯示與show version命令以及快取引擎的硬體元件相同的資訊。

  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 — 顯示快取引擎上的運行配置。

  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 — 顯示TACACS+伺服器的設定。

  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 — 顯示TACACS+統計資訊。

  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 — 顯示當前TACACS+當前身份驗證和授權配置。

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

疑難排解指令

本節提供的資訊可用於對組態進行疑難排解。

輸出直譯器工具(僅供已註冊客戶使用)(OIT)支援某些show命令。使用OIT檢視show命令輸出的分析。

附註：使用 debug 指令之前，請先參閱有關 Debug 指令的重要資訊。

• show debug — 顯示已啟用的debug命令。

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

• terminal monitor — 在螢幕上顯示調試輸出。此輸出顯示debug authentication和debug tacacs命令的結果。

  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
  

相關資訊

• Cisco 500系列快取引擎產品與服務