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Old 02-09-2009
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chebarbudo chebarbudo is offline
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Join Date: Nov 2008
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Posts: 188
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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