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Full Discussion: Passwd command problem
Homework and Emergencies Emergency UNIX and Linux Support Passwd command problem Post 302371008 by otheus on Friday 13th of November 2009 06:08:18 AM
Old 11-13-2009
Okay, REMOVE the line in pam.conf that refers to pam_chauthtok. It's probably unnecessary.

Look, PAM has three parts: a configuration file, a set of modules which do the hard work, and an API for applications (like "passwd" and "login") to interface to. Each application can use PAM how it wants, but there are general guidelines everyone follows. First, each application will go through PAM's "auth" service, which authenticates the user of the application. This is where "passwd" asks for your existing password and then uses each module that is configured in "pam.conf" (for "passwd" program) and invokes the "auth" service for all modules listed in the "auth" service; a failure in any one of the required modules will fail the whole service. Then, the "passwd" program will ask you for your new password (twice) and will then invoke the "password" service for each module listed in pam.conf for the passwd program under the "password" service; again, a failure for any required module will fail the whole service. In your case the failure is for a module failing to load. I suspect the chauthtok module is not really needed. So you can remove the line in pam.conf that says something like:
Code:
 passwd  password  required  pam_chauthtok.so

Now, if I'm wrong, one possibility is that passwd will fail "silently". That is, it will tell you it worked, when in fact, no change to the shadow file was actually made. In this case, it might be that pam_chauthtok was removed or that it is another module here that is needed.
 

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LEARN ABOUT XFREE86

pwconv

pwconv(1M)                                                System Administration Commands                                                pwconv(1M)

NAME

       pwconv - installs and updates /etc/shadow with information from /etc/passwd

SYNOPSIS

       pwconv

DESCRIPTION

       The pwconv command creates and updates /etc/shadow with information from /etc/passwd.

       pwconv relies on a special value of 'x' in the password field of /etc/passwd. This value of 'x' indicates that the password for the user is
       already in /etc/shadow and should not be modified.

       If the /etc/shadow file does not exist, this command will create /etc/shadow with  information  from  /etc/passwd.  The  command  populates
       /etc/shadow  with  the  user's  login  name,  password,  and  password  aging  information. If password aging information does not exist in
       /etc/passwd for a given user, none will be added to  /etc/shadow. However, the last changed information will always be updated.

       If the  /etc/shadow file does exist, the following tasks will be performed:

                Entries that are in the  /etc/passwd file and not in the /etc/shadow file will be added to the /etc/shadow file.

                Entries that are in the  /etc/shadow file and not in the /etc/passwd file will be removed from /etc/shadow.

                Password attributes (for example, password and aging information)  that exist in an /etc/passwd entry will be moved to the  corre-
                sponding entry in  /etc/shadow.

       The pwconv command can only be used by the super-user.

FILES

       /etc/opasswd

       /etc/oshadow

       /etc/passwd

       /etc/shadow

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       passwd(1), passmgmt(1M), usermod(1M), passwd(4), attributes(5)

DIAGNOSTICS

       pwconv exits with one of the following values:

       0        SUCCESS.

       1        Permission denied.

       2        Invalid command syntax.

       3        Unexpected failure.  Conversion not done.

       4        Unexpected failure.  Password file(s) missing.

       5        Password file(s) busy.  Try again later.

       6        Bad entry in /etc/shadow file.

SunOS 5.10                                                          9 Mar 1993                                                          pwconv(1M)
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