pam_authenticate man page on HP-UX

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pam_authenticate(3)					   pam_authenticate(3)

       pam_authenticate - perform authentication within the PAM framework

       [ flag ... ] file ...  [ library ... ]

       is  called  to  authenticate  the  current  user.   The user is usually
       required to enter a password or similar authentication token  depending
       upon  the  authentication  service configured within the system. In the
       case of smart card authentication this token would be a (Personal Iden‐
       tification Number).  The user in question should have been specified by
       a prior call to or The following flags may be set in the flags field:

	      Authentication service should not generate any messages

	      The authentication service should return
		     if the user has a null authentication token

       Refer to pam(3) for information on thread-safety of PAM interfaces.

       In the case of authentication failures due to an incorrect username  or
       password,  it  is the responsibility of the application to retry and to
       maintain the retry count.  An authentication service module may	imple‐
       ment an internal retry count and return an error if the module does not
       want the application to retry.

       If the PAM framework can not load the authentication  module,  then  it
       will  return  This indicates a serious failure and that the application
       should not attempt to retry the authentication.

       For security reasons, the location of authentication failures is hidden
       from  the  user.	  Thus, if several authentication services are stacked
       and a single service fails, requires that the user  re-authenticate  to
       all the services.

       A  null authentication token in the authentication database will result
       in successful authentication unless  was	 specified.   In  such	cases,
       there will not be any prompting for the user to enter an authentication

       The authentication can be done through a smart card. In this  case  the
       user plugs their smart card in the smart card reader and is required to
       enter their smart card PIN.

       Upon successful completion, is returned.	  In  addition	to  the	 error
       return  values  described  in  pam(3),  the  following  values  may  be

       Authentication failure.

       Can not access authentication data due to insufficient credentials.

       Underlying  authentication  service  can	 not  retrieve	authentication

       User not known to the underlying authentication module.

       An authentication service has maintained a retry count which
				       has  been  reached.  No further retries
				       should be attempted.

       pam(3), pam_start(3), pam_open_session(3), pam_setcred(3).


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