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| − | + | == Configuration == | |
| − | ASL can be configured through | + | ASL can be configured through the ASL GUI. Please see the [[ASL configuration]] page for documentation. |
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== '''Reporting False Positives''' == | == '''Reporting False Positives''' == | ||
Revision as of 16:13, 8 August 2012
How can I get a copy of ASL?
Please visit the Atomic Secured Linux product page.
Can I try it out first?
Absolutely! Just sign up for a no risk and no obligation free 30 day trial here.
Where is the ASL FAQ?
ASL FAQ - Atomic Secured Linux Frequently Asked Questions (FAQ)
Features in ASL
- Host Based Intrusion Detection for event monitoring, file system integrity checking, and rootkit detection
- Web Based Security Information Manager and Unified Threat Manager
- Web Application Firewall with Realtime Gotroot.com rules
- Vulnerability scanner and vulnerability repair and elimination system
- Realtime Malware Protection
- Hardened secure kernel to protect against rootkits, includes commercial support for grsecurity and PaX
- Self Healing system for system and application errors
- Self Learning Least Privilege Role Based Access Control System
- System Hardening tools
- Firewall enhancements and manager
- Stand Alone secure web GUI
- Malware uploader scanner (Web and FTP)
- Brute force attack detection (FTP, SSH, Web, SMTP, POP, IMAP and more!)
- Just In Time Patching system: Automatic security rules to protect unpatched systems
- Rootkit detection and prevention, including kernel level rootkits
- Process monitoring watchdog, to ensure critical and security services are always running
- Web Application inventory module
- Systems configuration validation (SSH, PHP and more)
- General security hardening (unnecessary services, etc)
- PHP configuration, checks and fixes dangerous settings
- Apache configuration checks and fixes
- DOS protection system
- Rule updater for Mod_security, GRsecurity, HIDS, Self Healing and the Application Inventory system
- Custom code for system hardening
- Special ClamAV rules
Installing ASL
Quickstart Command Line Documentation
1) Help
Usage: asl [options]
-bl --blacklist <value> Add <ip> to Blacklist.
-c --config Configure ASL settings.
-ck --check Show list of updates.
-dr --disable-rule <value> Disable modsec rule by signature ID.
--vhost <value> Enable/Disable modsec rule by vhost
modifier.
-dbl --domain-blacklist <value> Add <domain> to spam blacklist.
-er --enable-rule <value> Re-enable modsec rule by signature
ID.
-f --fix Fix and Repair mode.
-l --list List ASL modules.
-m --module <value> Run a specific module.
-mbl --malware-blacklist <value> Add <domain> to malware blacklist.
-nc --nocolor Disable Color.
-pc --permissions-check Check/Fix permissions on ASL
dirs/files.
--reload-firewall Reload Firewall rules.
--remove-blacklist <value> Remove <ip> from Blacklist.
--remove-domain-blacklist <value> Remove <domain> from spam Blacklist.
--remove-malware-blacklist <value> Remove <domain> from malware
Blacklist.
--remove-whitelist <value> Remove <ip> from Whitelist.
-rfp --report-false-positive <value> Report false positive on <path>.
-r --return Prompt to continue.
-s --scan Scan mode.
--show-alert <value> Show alert using <path>.
-t --terse Terse mode used for reporting
-ub --unblock <value> Unblock <ip> from active response
system.
-u --update Update rules and signatures.
-uf --force-update Force update of rules and signatures.
-v --version Show version.
-wl --whitelist <value> Add <ip> to whitelist.
--validate_gui Validate subscription
2) Update the rules and signatures databases
asl -u
2) Run a vulnerability scan
asl -s
3) Run a vulnerability scan, and fix vulnerabilities
asl -s -f
Configuration
ASL can be configured through the ASL GUI. Please see the ASL configuration page for documentation.
Reporting False Positives
See the Reporting False Positives page for details.
Application Inventory
The application inventory module is designed to identify applications installed on the system by analysing it's source code. It can be a very CPU intense operation and is configured by default to run once per day. ASL supports configuring the Application Inventory to run either Daily, Weekly, or with the following setting in /etc/asl/config
APPINV_CRON="daily"
Valid settings for this field are:
"daily"
"weekly"
"off"
Changing this setting in /etc/asl/config does *NOT* require a policy update with "asl -s -f".
ASL Web GUI Password Reset
To reset your password, run this command:
/var/asl/bin/asl-web-passwd your_user_name
Mod_Security: Enabling/Disabling Rules
ASL supports the ability to disable rules through the web and command line interface. To disable a rule just use this command:
asl --disable-rule <rule id>
Once a rule has been disabled, it can be re-enabled by running the following:
asl --enable-rule <rule id>
example:
asl --enable-rule 123456
You can also do this by virtual host:
asl --vhost www.example.com --disable-rule <rule id>
asl --vhost www.example.com --enable-rule <rule id>
A full list of currently disabled rules is available in /etc/asl/disabled_signatures
ASL inside a VPS
All of the features of ASL work inside a VPS. VPS technologies, such as Virtuzzo or OpenVZ abstract a single kernel running on the host system and share it with all the VPS'. Therefore, a VPS does not have a kernel of its own, it uses the host systems kernel. If you are using a VPS on a server that is not running ASL you will see several important kernel vulnerabilities reported in your system. These vulnerabilities are real, and they can not be fixed from inside a VPS.
The ASL kernel, when used with VPS technologies, can only be installed on the host machine, this is because the VPS' themselves do not have their own kernel. This is not to be confused with Virtual Machine technologies such as VMWare, KVM, Xen and others. Those virtual machines do have their own kernel, and therefore the ASL kernel can be installed inside those virtual machines. VPS', however, do not have their own kernel, they share the single host machines kernel. To eliminate these vulnerabilities in a VPS the host server must be running ASL as well.
VPS's will also see "hidden processes" reported by ASL. This is also expected as the rootkit detection capabilities of ASL are seeing hidden processes from other VPS' running on the system. Therefore VPS customers that do not wish to get these alerts will need to turn off rootkit checks inside their VPS's. To do this modify this file:
just modify this file:
/var/ossec/etc/ossec.conf
Search for this:
<rootcheck>
you should see something like this:
<rootcheck> <rootkit_files>/var/ossec/etc/shared/rootkit_files.txt</rootkit_files> <rootkit_trojans>/var/ossec/etc/shared/rootkit_trojans.txt</rootkit_trojans> </rootcheck>
Check that to this:
<rootcheck> <disabled>yes</disabled> </rootcheck>
You will also want to disable the hidden process checks in the VPS that are performed by rkhunter:
You want to edit this file:
/etc/rkhunter.conf
Look for this line:
ENABLE_TESTS="all"
Change it to:
#ENABLE_TESTS="all"
Then look for this line:
#DISABLE_TESTS="suspscan hidden_procs deleted_files packet_cap_apps"
And change it to:
DISABLE_TESTS="hidden_procs os_specific"
Do not disable these checks on the host server.
If you are not on a VPS, then reports of hidden process means you do in fact have hidden processes. That means you are running some root level process that is hiding a process, or your system was compromised at some point in the past, and ASL has detected that a rootkit is installed.
