Cómo configurar el soporte para TACACS+ en el motor de la memoria caché
Contenido
Introducción
Este documento describe cómo configurar la compatibilidad con el sistema de control de acceso del controlador de acceso de terminal Plus (TACACS+) para acceder al motor de caché de Cisco. Las instrucciones de este documento le permiten validar con un servidor/base de datos TACACS+ remoto cuando se conecta mediante telnet al motor de memoria caché. Si el servidor no incluye una entrada para su ID de usuario, comprueba localmente si hay información de acceso válida.
Prerequisites
Requirements
No hay requisitos específicos para este documento.
Componentes Utilizados
La información que contiene este documento se basa en las siguientes versiones de software y hardware.
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Motor de memoria caché 505 de Cisco en un entorno de laboratorio con configuraciones despejadas
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Versión 2.3.1 del software Cisco Cache Engine.
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CiscoSecure para UNIX
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
Convenciones
Consulte las Convenciones de Consejos Técnicos de Cisco para obtener información sobre las convenciones de los documentos.
Configurar
En esta sección encontrará la información para configurar las funciones descritas en este documento.
Nota: Utilice la herramienta Command Lookup (sólo para clientes registrados) para obtener más información sobre los comandos utilizados en esta sección.
Diagrama de la red
En este documento, se utiliza esta configuración de red:
Configuración de Cache Engine para el Soporte de TACACS+
Complete estos pasos para configurar el motor de memoria caché para el soporte de TACACS+:
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Configuración del Cache Engine para la versión correspondiente del Protocolo de comunicación de la memoria caché de la Web (WCCP).
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Utilice estos comandos para la configuración predeterminada:
authentication login local enable authentication configuration local enable
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Configure la dirección IP del servidor TACACS+. Si los servidores múltiples especifican cuál dirección es primaria, entonces los servidores secundarios quedan como opciones en blanco.
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Configure la autenticación al servidor TACACS+ como primaria. Si el servidor no está disponible, el valor predeterminado será la autenticación especificada localmente.
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Configure la autenticación con la información de clave TACACS+ cuando sea necesario.
Nota: Debe habilitar TACACS+ en Cisco Cache Engine porque los Cisco Cache Engines utilizan PPP para autenticarse con el servidor TACACS, a diferencia de los routers que no requieren PPP. Para habilitar TACACS+ en Cisco Cache Engines, abra Cisco Secure ACS 2.6, haga clic en la pestaña Group Setup y marque la casilla de verificación PPP IP ubicada en el área TACACS+ Settings.
Las líneas de comandos deben aparecer de forma similar a esta salida:
cepro(config)#tacacs server 172.18.124.114 cepro(config)#authentication login tacacs ena primary cepro(config)#authen configuration tacacs enab
Verificación
Use esta sección para confirmar que su configuración funciona correctamente.
La herramienta Output Interpreter Tool (clientes registrados solamente) (OIT) soporta ciertos comandos show. Utilice la OIT para ver un análisis del resultado del comando show.
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show version: muestra el software que se ejecuta en Cache Engine, así como algunos otros componentes como el tiempo de actividad del sistema (por ejemplo, dónde se inició el código y la fecha en que se compiló).
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"
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show hardware: muestra la misma información que el comando show version, así como los componentes de hardware del Cache Engine.
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: muestra la configuración en ejecución en el motor de memoria caché.
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#
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show tacacs —Muestra la configuración para el servidor TACACS+.
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—Muestra estadísticas TACACS+.
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—Muestra la configuración actual de autorización y autenticación de TACACS+.
cepro#show authentication Login Authentication: Console/Telnet Session ----------------------------- ----------------------- local enabled tacacs enabled (primary) Configuration Authentication: Console/Telnet Session ----------------------------- ----------------------- local enabled tacacs enabled cepro#
Comandos para resolución de problemas
En esta sección encontrará información que puede utilizar para solucionar problemas de configuración.
La herramienta Output Interpreter Tool (clientes registrados solamente) (OIT) soporta ciertos comandos show. Utilice la OIT para ver un análisis del resultado del comando show.
Nota: Consulte Información Importante sobre Comandos Debug antes de utilizar los comandos debug.
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show debug—Muestra los comandos debug que están habilitados.
cepro#show debug Authentication debugging is on Tacacs debugging is on
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monitor de terminal : muestra los resultados de las depuraciones en la pantalla. Este resultado muestra los resultados de los comandos debug authentication y debug tacacs.
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
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