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    Command:

    pam_authenticate

    
    
    

    SYNOPSIS

           #include <security/pam_appl.h>
    
           int pam_authenticate(pam_handle_t *pamh, int flags);
    
    
    

    DESCRIPTION

           The pam_authenticate function is used to authenticate the user. The
           user is required to provide an authentication token depending upon the
           authentication service, usually this is a password, but could also be a
           finger print.
    
           The PAM service module may request that the user enter their username
           vio the the conversation mechanism (see pam_start(3) and pam_conv(3)).
           The name of the authenticated user will be present in the PAM item
           PAM_USER. This item may be recovered with a call to pam_get_item(3).
    
           The pamh argument is an authentication handle obtained by a prior call
           to pam_start(). The flags argument is the binary or of zero or more of
           the following values:
    
           PAM_SILENT
               Do not emit any messages.
    
           PAM_DISALLOW_NULL_AUTHTOK
               The PAM module service should return PAM_AUTH_ERR if the user does
               not have a registered authentication token.
    
    
    

    RETURN VALUES

           PAM_ABORT
               The application should exit immediately after calling pam_end(3)
               first.
    
           PAM_AUTH_ERR
               The user was not authenticated.
    
           PAM_CRED_INSUFFICIENT
               For some reason the application does not have sufficient
               credentials to authenticate the user.
    
           PAM_AUTHINFO_UNVAIL
               The modules were not able to access the authentication information.
               This might be due to a network or hardware failure etc.
    
           PAM_MAXTRIES
               One or more of the authentication modules has reached its limit of
               tries authenticating the user. Do not try again.
    
           PAM_SUCCESS
               The user was successfully authenticated.
    
           PAM_USER_UNKNOWN
               User unknown to authentication service.
    
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