John the Ripper/Shadow File: Difference between revisions
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Now you can run John the Ripper on the file <code>mypasswd</code>. | |||
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Revision as of 05:19, 26 March 2016
Shadow File
Unix stores information about system usernames and passwords in a file called /etc/shadow. In this file, there are multiple fields (see Reading /etc/shadow page on the wiki for help reading the /etc/shadow file). The most important are the first two: username and password hash.
Example of an /etc/shadow file:
root:$1$/avpfBJ1$x0z8w5UF9Iv./DR9E9Lid.:14747:0:99999:7::: daemon:*:14684:0:99999:7::: bin:*:14684:0:99999:7::: sys:$1$fUX6BPOt$Miyc3UpOzQJqz4s5wFD9l0:14742:0:99999:7::: sync:*:14684:0:99999:7::: games:*:14684:0:99999:7::: man:*:14684:0:99999:7::: lp:*:14684:0:99999:7::: mail:*:14684:0:99999:7::: news:*:14684:0:99999:7::: uucp:*:14684:0:99999:7::: proxy:*:14684:0:99999:7::: www-data:*:14684:0:99999:7::: backup:*:14684:0:99999:7::: list:*:14684:0:99999:7::: irc:*:14684:0:99999:7::: gnats:*:14684:0:99999:7::: nobody:*:14684:0:99999:7::: libuuid:!:14684:0:99999:7::: dhcp:*:14684:0:99999:7::: syslog:*:14684:0:99999:7::: klog:$1$f2ZVMS4K$R9XkI.CmLdHhdUE3X9jqP0:14742:0:99999:7::: sshd:*:14684:0:99999:7::: msfadmin:$1$XN10Zj2c$Rt/zzCW3mLtUWA.ihZjA5/:14684:0:99999:7::: bind:*:14685:0:99999:7::: postfix:*:14685:0:99999:7::: ftp:*:14685:0:99999:7::: postgres:$1$Rw35ik.x$MgQgZUuO5pAoUvfJhfcYe/:14685:0:99999:7::: mysql:!:14685:0:99999:7::: tomcat55:*:14691:0:99999:7::: distccd:*:14698:0:99999:7::: user:$1$HESu9xrH$k.o3G93DGoXIiQKkPmUgZ0:14699:0:99999:7::: service:$1$kR3ue7JZ$7GxELDupr5Ohp6cjZ3Bu//:14715:0:99999:7::: telnetd:*:14715:0:99999:7::: proftpd:!:14727:0:99999:7::: statd:*:15474:0:99999:7::: snmp:*:15480:0:99999:7:::
Only users with a password hash can log in (if there is a * or a !, they cannot log in).
Unshadow the Shadow
To turn an /etc/shadow file into a normal unix password file, use the unshadow utility (from John the Ripper):
umask 077 unshadow /etc/passwd /etc/shadow > mypasswd
Now you can run John the Ripper on the file mypasswd.
Flags
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john the ripper password generator and all-around cracking tool.
Testing John: John the Ripper/Benchmarking Using John on Password generation using rules and modes: John the Ripper/Password Generation Installing some useful password rules: John the Ripper/Rules Using John to feed password guesses to Aircrack: Aircrack and John the Ripper John the Ripper on AWS: Ubuntu/Barebones to JtR Getting Passwords from John: John the Ripper/Password Recovery
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