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Top Forums Shell Programming and Scripting How can I check that a password is correct? Post 302285702 by chebarbudo on Monday 9th of February 2009 01:36:15 PM
Old 02-09-2009
Question How can I check that a password is correct?

Hi there,
There's something I don't understand. The same string does not give the same md5 hash everytime. I wanted to find a way to check someone's password but the following script obviously shows that it's not possible that way :
Code:
ks354286:~# user=foo
ks354286:~# pw=$(mkpasswd -H md5 topsecret)
ks354286:~# echo "$user:$pw"
foo:$1$WYq0L220$25QI3T1cMGh1PsJc5guFv1
ks354286:~#
ks354286:~# useradd -p$pw $user
ks354286:~# grep "$user:$pw" /etc/shadow
foo:$1$WYq0L220$25QI3T1cMGh1PsJc5guFv1:14284:0:99999:7:::
ks354286:~#
ks354286:~# pw=$(mkpasswd -H md5 topsecret)
ks354286:~# echo "$user:$pw"
foo:$1$wrSmUGbt$DtqoBPvQ7xImZcHi3F2M71
ks354286:~#
ks354286:~# grep "$user:$pw" /etc/shadow
ks354286:~#

So in short. How can I check someone's password?
Thanks for your help
Santiago

PS: By the way, I have exactly the same problem with MySQL.
 

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chpasswd(8)						      System Manager's Manual						       chpasswd(8)

NAME
chpasswd - change user passwords in batch SYNOPSIS
chpasswd [-D binddn] [-P path] [-c des|md5|blowfish | -e] [file] DESCRIPTION
chpasswd changes passwords for user accounts in batch. It reads a list of login and password pairs from standard input or a file and uses this information to update the passwords of this user accounts. The named account must exist and the password age will be updated. Each input line is of the format: user_name:password If the hash algorithmus is not given on the commandline, the value of GROUP_CRYPT or, if not specified, CRYPT from /etc/default/passwd is used as hash algorithmus. If not configured, the traditinal des algorithmus is used. OPTIONS
-c des|md5|blowfish This option specifies the hash algorithmus, which should be used to encrypt the passwords. -e The passwords are expected to be in encrypted form. Normally the passwords are expected to be cleartext. -D, --binddn binddn Use the Distinguished Name binddn to bind to the LDAP directory. The user will be prompted for a password for simple authentica- tion. -P, --path path The passwd and shadow files are located below the specified directory path. chpasswd will use this files, not /etc/passwd and /etc/shadow. FILES
/etc/default/passwd - default values for password hash SEE ALSO
passwd(1), passwd(5), shadow(5) AUTHOR
Thorsten Kukuk <kukuk@suse.de> pwdutils Feburary 2004 chpasswd(8)
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