Determine which name service created entry in database (eg passwd)?

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On Linux and Unix-like systems the Name Service Switch is used to gather entries for the systems name databases.



There are databases such as files, dns, nis and ldap. Is it possible to determine for a given user which service was used to add that entry?



Must further information be gathered from the respective tools for those services or is there a standard set of information NSS gathers besides just a name?



Further how does PAM get credentials from NSS? Is it just the username? Is NSS used when PAM is authenticating over ldap? Does PAM call back to NSS? Is PAM even used in LSAP or other networked logins?



Can NSS be bypassed for some other system or is it heavily baked into the kernel?




linux pam ldap nsswitch




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    up vote
    2
    down vote

    favorite












    On Linux and Unix-like systems the Name Service Switch is used to gather entries for the systems name databases.



    There are databases such as files, dns, nis and ldap. Is it possible to determine for a given user which service was used to add that entry?



    Must further information be gathered from the respective tools for those services or is there a standard set of information NSS gathers besides just a name?



    Further how does PAM get credentials from NSS? Is it just the username? Is NSS used when PAM is authenticating over ldap? Does PAM call back to NSS? Is PAM even used in LSAP or other networked logins?



    Can NSS be bypassed for some other system or is it heavily baked into the kernel?




    linux pam ldap nsswitch




    share|improve this question






















      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite











      On Linux and Unix-like systems the Name Service Switch is used to gather entries for the systems name databases.



      There are databases such as files, dns, nis and ldap. Is it possible to determine for a given user which service was used to add that entry?



      Must further information be gathered from the respective tools for those services or is there a standard set of information NSS gathers besides just a name?



      Further how does PAM get credentials from NSS? Is it just the username? Is NSS used when PAM is authenticating over ldap? Does PAM call back to NSS? Is PAM even used in LSAP or other networked logins?



      Can NSS be bypassed for some other system or is it heavily baked into the kernel?




      linux pam ldap nsswitch




      share|improve this question












      On Linux and Unix-like systems the Name Service Switch is used to gather entries for the systems name databases.



      There are databases such as files, dns, nis and ldap. Is it possible to determine for a given user which service was used to add that entry?



      Must further information be gathered from the respective tools for those services or is there a standard set of information NSS gathers besides just a name?



      Further how does PAM get credentials from NSS? Is it just the username? Is NSS used when PAM is authenticating over ldap? Does PAM call back to NSS? Is PAM even used in LSAP or other networked logins?



      Can NSS be bypassed for some other system or is it heavily baked into the kernel?





      linux pam ldap nsswitch





      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 17 '17 at 18:34









      jdwolf

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