Documentation Security Beat

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== Password Quality Checking ==
 
 
Fedora now has a single configurable library, ''[https://fedorahosted.org/libpwquality libpwquality]'', for checking the quality of new passwords used for system accounts. The system wide password quality checks provided by this library are configured by modifying the /etc/security/pwquality.conf configuration file.
 
 
Developers wishing to call this API from their applications will find the API description in the pwquality.h file provided by the ''libpwquality-devel'' package. A python wrapper, ''python-pwquality'', is also provided.
 
 
 
== SELinux Deny Ptrace ==
 
 
A new SELinux boolean, ''deny_ptrace'', has been added. It is recommended that users who do not plan to debug applications on their machine turn this boolean on. The boolean prevents rogue processes from being able to read the memory of, or otherwise attack, other processes using debugging tools including ''ptrace'' and ''gdb''.
 
 
Such attacks are prevented even where the rogue process is running as the root user or attacking a process running with the same SELinux context and label. To permanently enable the protection provided by the ''deny_ptrace'' boolean, execute the following command as root:
 
 
# setsebool -P deny_ptrace 1
 
 
To disable the protection provided by the ''deny_ptrace'' boolean temporarily, execute the following command as root:
 
 
# setsebool deny_ptrace 0
 
 
 
== Services Private /tmp ==
 
 
A number of services managed by ''systemd'' have been modified to make use of its ability to provide them with a private ''/tmp'' directory. Privileged services using ''/tmp'' and ''/var/tmp'' have previously been found to be open to being interfered with by unprivileged users, potentially leading to privilege escalation. Using private ''/tmp'' directories for services prevents this style of exploit.
 
 
The directive added to the ''systemd'' unit files for the modified services is:
 
 
[Service]
 
PrivateTmp=true
 
 
 
== Secure Containers ==
 
 
A new tool, ''sandbox'', has been created to streamline creation of secure ''libvirt'' containers. When provided with an executable ''sandbox'' determines the mount points  and ''libvirt'' container information required to run the application in a container. The container is then launched by ''libvirt'' with an SELinux context that will prevent it interacting with other processes on the system, including other containers, while still being able to share system data.
 
 
This allows an administrator to run multiple instances of a service simultaneously, while preventing them from breaking the host machine or other processes on the system, even when run as ''root''. To use ''sandbox'', install the ''libvirt-sandbox'' package.
 
 
 
=== krb5-workstation ===
 
 
Fedora 17 upgrades the Kerberos authentication system to version 1.10. This adds support for changing passwords over a NAT and support for localization. The kswitch command is added to switch between credential caches. Additional cache support has been added to other commands. Credential choice can be controlled with the file $HOME/.k5identity.
 
  
 
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Revision as of 15:35, 27 August 2012

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