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 CENTOS

pam_loginuid

PAM_LOGINUID(8) 						 Linux-PAM Manual						   PAM_LOGINUID(8)

NAME

       pam_loginuid - Record user's login uid to the process attribute

SYNOPSIS

       pam_loginuid.so [require_auditd]

DESCRIPTION

       The pam_loginuid module sets the loginuid process attribute for the process that was authenticated. This is necessary for applications to
       be correctly audited. This PAM module should only be used for entry point applications like: login, sshd, gdm, vsftpd, crond and atd. There
       are probably other entry point applications besides these. You should not use it for applications like sudo or su as that defeats the
       purpose by changing the loginuid to the account they just switched to.

OPTIONS

       require_auditd
	   This option, when given, will cause this module to query the audit daemon status and deny logins if it is not running.

MODULE TYPES PROVIDED

       Only the session module type is provided.

RETURN VALUES

       PAM_SESSION_ERR
	   An error occurred during session management.

EXAMPLES

	   #%PAM-1.0
	   auth       required	   pam_unix.so
	   auth       required	   pam_nologin.so
	   account    required	   pam_unix.so
	   password   required	   pam_unix.so
	   session    required	   pam_unix.so
	   session    required	   pam_loginuid.so

SEE ALSO

       pam.conf(5), pam.d(5), pam(8), auditctl(8), auditd(8)

AUTHOR

       pam_loginuid was written by Steve Grubb <sgrubb@redhat.com>

Linux-PAM Manual						    09/19/2013							   PAM_LOGINUID(8)