SOCKS proxy & PAM configuration exposure Post: 302988819

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Top Forums UNIX for Advanced & Expert Users SOCKS proxy & PAM configuration exposure Post 302988819 by rbatte1 on Tuesday 3rd of January 2017 09:49:49 AM

01-03-2017

Moderator

Thanks for the pointers. I am pleased to report that we have changed /etc/pam.d/ss5 from this:-

Code:

#%PAM-1.0
auth       include      system-auth
account    required     pam_nologin.so
auth       required     pam_wheel.so use_uid group=SocksUsers
account    include      system-auth
password   include      system-auth
session    optional     pam_keyinit.so force revoke
session    include      system-auth
session    required     pam_loginuid.so

.... to this (grouping all the auth statements together too):-

Code:

#%PAM-1.0
auth       requisite	pam_succeed_if.so debug user ingroup socksusers
auth       include      system-auth
account    required     pam_nologin.so
account    include      system-auth
password   include      system-auth
session    optional     pam_keyinit.so force revoke
session    include      system-auth
session    required     pam_loginuid.so

When we moved the rule up the order before the include statement, the use_uid meant that the rules were being applied to the account running the code, not the connecting user, i.e. it was testing the single account root for every connection.

Notes:-

I've set this to be requisite to just exit if the account does not have the required group.
I found that pam_succeed_if.so gave me the debug option for logging.
The pam_succeed_if.so also can be extended if multiple acceptance criteria were required.
The group appears to be case-insensitive, but shows as all lower case when running something like id rbatte1 | sed 's/) /)\n/g ; s/,/\n/g' | sort -nk1,1.5

I hope that this might be useful to someone else.

Robin

rbatte1

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LEARN ABOUT FREEBSD

pam_ldap

pam_ldap(8)						      System Manager's Manual						       pam_ldap(8)

NAME

       pam_ldap - PAM module for LDAP-based authentication

SYNOPSIS

       pam_ldap.so [...]

DESCRIPTION

       This is a PAM module that uses an LDAP server to verify user access rights and credentials.

OPTIONS

       use_first_pass
	      Specifies that the PAM module should use the first password provided in the authentication stack and not prompt the user for a pass-
	      word.

       try_first_pass
	      Specifies that the PAM module should use the first password provided in the authentication stack and if that fails prompt  the  user
	      for a password.

       nullok Specifying this option allows users to log in with a blank password.  Normally logins without a password are denied.

       ignore_unknown_user
	      Specifies  that  the  PAM module should return PAM_IGNORE for users that are not present in the LDAP directory.  This causes the PAM
	      framework to ignore this module.

       ignore_authinfo_unavail
	      Specifies that the PAM module should return PAM_IGNORE if it cannot contact the LDAP server.  This causes the PAM framework  to  ig-
	      nore this module.

       no_warn
	      Specifies that warning messages should not be propagated to the PAM application.

       use_authtok
	      This  causes the PAM module to use the earlier provided password when changing the password. The module will not prompt the user for
	      a new password (it is analogous to use_first_pass).

       debug  This option causes the PAM module to log debugging information to syslog(3).

       minimum_uid=UID
	      This option causes the PAM module to ignore the user if the user id is lower than the specified value. This can be  used	to  bypass
	      LDAP checks for system users (e.g. by setting it to 1000).

MODULE SERVICES PROVIDED

       All services are provided by this module but currently sessions changes are not implemented in the nslcd daemon.

FILES

       /etc/pam.conf
	      the main PAM configuration file

       /etc/nslcd.conf
	      The configuration file for the nslcd daemon (see nslcd.conf(5))

SEE ALSO

       pam.conf(5), nslcd(8), nslcd.conf(5)

AUTHOR

       This manual was written by Arthur de Jong <arthur@arthurdejong.org>.

Version 0.8.10							     Jun 2012							       pam_ldap(8)