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Full Discussion: Change password to blank password
Operating Systems AIX Change password to blank password Post 302772457 by MichaelFelt on Monday 25th of February 2013 05:19:56 PM
Old 02-25-2013
If the login is failing because you need a passwordless login by a script, and the script is failing - it is probably because the ADMCHG flag is still set.

Note: passwordless is not recommended. Use the following at your own (companies) risk!

Code:
michael@x054:[/]pwdadm test0001
Changing password for "test0001"
test0001's New password: 

3004-602 The required password characteristics are:
        a maximum of 8 repeated characters.
        a minimum of 4 characters not found in old password.
        a minimum of 2 alphabetic characters.
        a minimum of 2 non-alphabetic characters.
        a minimum of 8 characters in length.


3004-603 Your password must have:
        a minimum of 4 characters not found in old password.
        a minimum of 2 non-alphabetic characters.
        a minimum of 8 characters in length.
test0001's New password: 
Enter the new password again:
michael@x054:[/]pwdadm -q test0001
test0001: 
        lastupdate = 1361830098
        flags = ADMCHG


michael@x054:[/]grep -p test0001 /etc/security/passwd 
test0001:
        password = {ssha512}06$ssCPpi0nCu7juMBJ$JyZKPfkmLl0Y.7bgLbVQIw1V.flPaptjEiUXWVpbBPC6Khj9kcprkae4Xd9FYqItjaEPY7kA7lULiVeHS4zl..
        lastupdate = 1361830098
        flags = ADMCHG

michael@x054:[/]
michael@x054:[/]pwdadm -f NOCHECK test0001
michael@x054:[/]pwdadm -q test0001
test0001: 
        lastupdate = 1361830098
        flags = NOCHECK

michael@x054:[/]grep -p test0001 /etc/security/passwd
test0001:
        password = {ssha512}06$ssCPpi0nCu7juMBJ$JyZKPfkmLl0Y.7bgLbVQIw1V.flPaptjEiUXWVpbBPC6Khj9kcprkae4Xd9FYqItjaEPY7kA7lULiVeHS4zl..
        lastupdate = 1361830098
        flags = NOCHECK

michael@x054:[/]pwdadm test0001
Changing password for "test0001"
test0001's New password: 
Setting "test0001's" password to NULL.
michael@x054:[/]grep -p test0001 /etc/security/passwd
test0001:
        password =                                                                                                                    
        lastupdate = 1361830487
        flags = NOCHECK,ADMCHG

michael@x054:[/]pwdadm -f NOCHECK test0001           
michael@x054:[/]grep -p test0001 /etc/security/passwd
test0001:
        password =                                                                                                                    
        lastupdate = 1361830487
        flags = NOCHECK       
michael@x054:[/]

In short, you need pwdadm -f NOCHECK username to disable password checks to be sure you can enter a NULL password, and you will need to enter it again so that the ADMCHG (admin change) flag is cleared after you set the NULL password.

Note: You need to be root to perform the grep -p username /etc/security/passwd command
This User Gave Thanks to MichaelFelt For This Post:
landog
 

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LEARN ABOUT OSF1

dxchpwd

dxchpwd(1X)															       dxchpwd(1X)

NAME

       dxchpwd - Create or change password program

SYNOPSIS

       dxchpwd

       dxchpwd -r  | -l

       dxchpwd [-r  | -l] -q

       dxchpwd [-r  | -l] -u  username

OPTIONS

       If dxchpwd is invoked without any options, it is assumed that the current user's password is to be changed.  The following options are also
       accepted: Tells dxchpwd that the password change is to be done for a Local user. This can be combined with the -u and  -q  options.   Tells
       dxchpwd	that the password change is to be done for a NIS user. This can only be done from a NIS master and can be combined with the -u and
       -q options.  Tells dxchpwd to query the user for the user name of the account whose password is to be changed.	Tells  dxchpwd	to  change
       this user's password.

DESCRIPTION

       The  dxchpwd  command lets you change your password.  When you invoke the dxchpwd command, the program prompts you for the old password and
       then for the new password.  Next, the program asks you for the new password again, to verify that you have typed it correctly.	Note  that
       the passwords are not displayed on the screen.

       Your new password must meet the length requirements specified by the authorization database for the user whose password is being changed.

       If  your system is running with enhanced security, you may have to choose a password from a list of randomly generated passwords or you may
       be prohibited from changing your password until its minimum lifetime has expired, as specified in the authorization database.

EXAMPLES

       The following example requests that the password be changed for user smith: dxchpwd -u smith

FILES

       Password file Protected Password Database dxchpwd executable

SEE ALSO

       X(1X), xdm(1X), passwd(1)

																       dxchpwd(1X)
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