Cheatography
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Cisco device configuration commands for security (SEC-160)
Login EnhancementsCommand | Function | login block-for 120 attempts 3 within 30
| blocks login attempts for 120 secs if 3 fail within 30 secs
(login local must be configured) | login quiet-mode access-class [acl-name | acl-number]
| maps to an ACL so only authorized hosts can attempt to login | login delay seconds
| wait-time between login attempts | login on-success log
| records successful logins | login on-failure log
| records failed login attempts |
> Login enhancements don't apply to console connections
> login block-for must be configured before any others Role-Based CLI ViewsCommand | Mode | Function | aaa new-model
| global | enables AAA | parser view view-name
| global | creates a new view (must be in root view) | secret password
| view | assigns view password (required) | commands parser-mode [include|exclude] [command|interface]
| view | assigns command or interface to view | enable view view-name
| priv. EXEC | enters view (enable secret for root password) | parser view view-name superview
| global | creates a new superview | secret password
| superview | assigns superview password (required) | view view-name
| superview | assigns existing view to superview |
IPsec VPNs (Site-to-Site)| | Command | Mode | ----- Phase 1 ----- | cry is en
| crypto isakamp enable
| global | cry is pol 10
| crypto isakmp policy 10
| global | h sha
| hash sha
| (config-isakmp) | a p (auth pre)
| authentication pre-share
| (-isakmp) | g 14
| group [DH group #]
| (-isakmp) | l 3600
| lifetime [secs]
| (-isakmp) | enc a 256
| encryption aes 256
| (-isakmp) | cry is key vpnpass add 10.2.2.2
| crypto isakmp key [key] address [peer IP]
| global | ----- Phase 2 ----- | cry ip t VPN-SET esp-a 256 esp-sha-
| crypto ipsec transform-set [tag] [encry.] [bits] [hash]
| global | cry ip s l s
| crypto ipsec security-association lifetime seconds 1800
| global | cry map CMAP 10 ipsec-i
| crypto map [name] [seq #] ipsec-isakmp
| global | m add 101
| match address 101
| (-crypto-map) | s pe 10.2.2.2
| set peer [peer IP]
| (-crypto-map) | s pfs group14
| set pfs [group#]
| (-crypto-map) | s t VPN-SET
| set transform-set [tag]
| (-crypto-map) | s s li s 900
| set security-association lifetime seconds [secs]
| (-crypto-map) | desc [text]
| description [text]
| (-crypto-map) | cry m CMAP
| crypto map [name]
| interface |
Line Config ModeCommand | Line | Function | no exec
| any unused | disables EXEC mode for the line (outgoing connections only) | login local
| all | forces username/password authentication from local database | logging synchronous
| all | prevents logging from interrupting commands | exec-timeout 5 0
| all | logs out after 5 mins inactive |
Informational/Show CommandsShort Command | Full Command | What It Displays | sh login
| show login
| configured login settings | sh login f
| show login failures
| details about login failures (src IP, count, time/date, etc) | sh cry key mypubkey r
| show crypto key mypubkey rsa
| current RSA keys | sh ip ssh
| show ip ssh
| SSH configuration | sh ssh
| show ssh
| current SSH connections | sh p v a
| show parser view all
| summary of all configured views
(asterisk indicates superview) | sh sec b
| show secure bootset
| verification of the archive | sh logg
| show logging
| logging configuration & buffered syslog messages | sh us
| show users
| users connected to the device | sh cr is po
| show crypto isakmp policy
| ISAKMP policy configuration | sh cr ip sa
| show crypto ipsec sa
| IPsec security association | sh cr map
| show crypto map
| crypto map configuration |
Logging & MonitoringCommand | Mode | Function | service timestamps log datetime msec
| global | enables timestamps service | logging host ip-address
| global | specifies syslog server | logging trap level
| global | sets log severity level | logging source-interface ip-address
| global | identifies the device sending the log info | logging on
| global | turns on logging |
Secure BootsetCommand | Mode | Function | secure boot-image
| global | secures IOS image & enables Cisco IOS image resilience | secure boot-config
| global | takes snapshot of running-config to save in persistent storage | --- To Restore Secure Configuration --- | reload -> ROMmon mode
| dir
| ROMmon | lists contents of device where secure bootset is stored | boot flash:filename
| ROMmon | boots route with secure IOS image | secure boot-config restore flash:filename
| global | restores secure config |
SSH ConfigurationCommand | Function | user Bob algorithm-type scrypt secret password
| creates user in local database | ip domain-name span.com
| sets network domain name | crypto key zeroize rsa
| removes any existing RSA key pairs | cry key gen rsa gen mod 1024
| creates RSA encryption key (max: 4096 bits) | transport input ssh
| enables SSH (line config, vty) | ip ssh time-out seconds
| sets SSH timeout length | ip ssh authentication-retries 2
| sets number of login attempts before user is disconnected | ip ssh version 2
| sets SSH version to v2 |
Miscellaneous ConfigurationsCommand | Function | license boot module c1900 technology-package securityk9
| Adds security package to 1941 routers! | no service password-recovery
| prevents an attacker from recovering the router password |
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