SOCKS proxy & PAM configuration exposure Post: 302988819

Sponsored Content

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

View Public Profile for rbatte1

Visit rbatte1's homepage!

Find all posts by rbatte1

9 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Pam configuration

I have suse (SLES 9) machine,I would like to know how to creat a PAM configure file for ldap authentication and loading it using a "config" argument to pam_ldap.so Thanks for your help

2. UNIX for Dummies Questions & Answers

reread pam configuration

Hi. i am on solaris. I have changed pam configuration. Do i need to let pam re-read its configuration again? If so, how can i do it? ps -ef | grep -i pam, returns no hits. Rgds

3. IP Networking

proxy DNS configuration

i have the DNS and the web proxy services running on one of my sun machines....the funny thing is clients use the proxy server by addressing it with its IP address only....what i need is to assign it like...proxy.amu.edu.et...... my guess is the problem is the configuration with the DNS ...but i...

4. Red Hat

PAM configuration: Kerberos authentication and NIS authorization problem

Hi, I've configured two linux boxes to authenticate against Windows Active Directory using Kerberos while retrieving authorization data (uids, gids ,,,)from NIS. The problem I ran into with my PAM configuration is that all authentication attempts succeed in order.i.e. if someone tried his...

5. IP Networking

SQUID Proxy server configuration

Can any one direct me to the resources where I can find in-depth instructions on Squid Proxy server and its configuration? Thanks in advance.:)

6. UNIX for Advanced & Expert Users

Squid Dynamic Proxy Server Configuration

Hello all, I am trying to configure squid proxy server for different organizations. These organizations will have different blocked ports, different acls, etc. But, I can use only one proxy server for this purpose. Thinking of making a shell script with iptables and squid. For an example: a...

7. Shell Programming and Scripting

AIX pam ssh/sshd configuration not allowing sed or awk

This is a weird problem. Following is my code. /opt/quest/bin/vastool configure pam sshd /opt/quest/bin/vastool configure pam ssh cat /etc/pam.conf | \ awk '$1=="ssh"||$1=="sshd"||$1=="emagent"{sub("prohibit","aix",$NF);}1' OFS='\t' > /etc/pam.conf cat /etc/ssh/sshd_config | \ sed -e...

8. UNIX for Dummies Questions & Answers

Can't connect through ssh socks proxy to certain sites

Hello, i setup an open socks proxy on my remote vps: ssh -f -N -D 0.0.0.0:1080 localhost and then allowed only connections from IP of my home computer iptables -A INPUT --src myhomeip -p tcp --dport 1080 -j ACCEPT iptables -A INPUT -p tcp --dport 1080 -j REJECT but it appears that im...

9. Shell Programming and Scripting

Proxy socks tester issue

I have a list of ip socks / port(eg: 192.168.0.1 80). I would like to write a bash to test automatically these addresses in a loop with firefox. The problem is that firefox process stays alive even when firefox does not work because of wrong network settings. So I want to kill the process when the...

LEARN ABOUT DEBIAN

pam_deny

PAM_DENY(8)							 Linux-PAM Manual						       PAM_DENY(8)

NAME

       pam_deny - The locking-out PAM module

SYNOPSIS

       pam_deny.so

DESCRIPTION

       This module can be used to deny access. It always indicates a failure to the application through the PAM framework. It might be suitable
       for using for default (the OTHER) entries.

OPTIONS

       This module does not recognise any options.

MODULE TYPES PROVIDED

       All module types (account, auth, password and session) are provided.

RETURN VALUES

       PAM_AUTH_ERR
	   This is returned by the account and auth services.

       PAM_CRED_ERR
	   This is returned by the setcred function.

       PAM_AUTHTOK_ERR
	   This is returned by the password service.

       PAM_SESSION_ERR
	   This is returned by the session service.

EXAMPLES

	   #%PAM-1.0
	   #
	   # If we don't have config entries for a service, the
	   # OTHER entries are used. To be secure, warn and deny
	   # access to everything.
	   other auth	  required	 pam_warn.so
	   other auth	  required	 pam_deny.so
	   other account  required	 pam_warn.so
	   other account  required	 pam_deny.so
	   other password required	 pam_warn.so
	   other password required	 pam_deny.so
	   other session  required	 pam_warn.so
	   other session  required	 pam_deny.so

SEE ALSO

       pam.conf(5), pam.d(5), pam(7)

AUTHOR

       pam_deny was written by Andrew G. Morgan <morgan@kernel.org>

Linux-PAM Manual						    06/04/2011							       PAM_DENY(8)