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| Feel free to add any suggestions or corrections here. Thanks :) | | Feel free to add any suggestions or corrections here. Thanks :) |
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| * Is SELinux enabled by default on Debian? If not, link to appropriate information (probably found on http://wiki.debian.org/) | | * Is SELinux enabled by default on Debian? If not, link to appropriate information (<http://wiki.debian.org/SELinux>) |
| | * Is <code>system_u:object_r:httpd_sys_content_t</code> required for all SugarCRM files? |
| | * A section on setroubleshoot. |
| | * SELinux open permission: <http://james-morris.livejournal.com/31714.html> |
| | * Can users control where SELinux logs are written to? |
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| Suggestions from domg472:
| | [[Category:SELinux docs]] |
| <pre>
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| Basic access control models ( DAC , MAC ) ( not so basic MDAC )
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| explain discretionary
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| explain the dac model attributes: user group permission bits
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| explain why dac acl is not sufficient. example privilege escalation
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| explain the mac model attributes: security context
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| explain mandatory
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| explain that MAC is ACL layer on top of the DAC ACL layer
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| explain Type enforcement
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| explain Role Based AC
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| explain Multi Level Security
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| Explain Multi Category/Compartment Security
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| compare a selinux system to a submarine with compartments. if one compartment has a leak,
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| the water will be contained to that compartment and will not be able to spread ( escalate) . submarine will not sink
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| Security context / SELinux attributes
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| explain the security context tuple and how to read it (explain the fields)
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| explain user ( which SELinux user (group) created the object? )
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| explain type is the attribute for type enforcement (TE)
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| explain role is the attribute for role enforcement (RBAC)
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| explain security level is the attribute for security level enforcement (MLS)
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| explain categories/compartments is the attribute for security level enforcement or category/compartment enforcement (MLS or MCS)
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| Subjects and objects ( processes and "files" )
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| explain that everything in a system is a object
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| explain that even subjects in a system are represented as objects in proc mountpoint
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| explain subjects and objects
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| explain subjects are processes (ps auxZ)
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| explain objects are "files" (ls -alZ)
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| - file objects ( files , lnk files, dirs, fifo files, sock files etc)
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| - port objects
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| - interface objects
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| - node objects
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| - objects available by other programs ACE access control extension: XACE, sepostgesql, SEDBUS, mscd, etc.
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| - explain object is a class defined in kernel :process :file :tcp_socket
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| example of a class: process. example of a class: file
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| explain domain type is the attribute of a process ( user_t is (user) domain type/attribute of "user"
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| explain object type is the attribute of a object or "file". do not mistake files with file objects/file types. a "file" is
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| any object
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| explain that a object type can never be a scontext ( source context ) in a avc denail
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| explain that processes (subjects) generally operate on files (objects)
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| explain that processes (subjects) also operate on other processes (subjects) example: process ( sigchld ) if a user
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| processes spawns a program process.
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| explain that "files" ( objects ) do not operate. they get operated on by subjects ( processes )
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| explain permissions that define how to operate on subjects and objects ( classes ) are defined in the kernel and are attributes of classes
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| explain classes and their attributes are static defined in kernel:
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| - example of a file object class and its attributes:
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| + file read
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| + dir write
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| + lnk_file getattr
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| - example of a subject class and its attributes:
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| + process sigchld
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| - example of a object available by other programs ACL
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| + dbus send_msg
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| explain that although classes and their attributes are defined in the kernel, that one can assign "types" to
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| subjects and objects, and that one can define policy for these types can interact using the object classes
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| and their attributes supplied by the kernel.
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| example:
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| scontext/domain type/subject | tcontext/file type/object | "object" class | "object" permissions/attributes
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| ___________________________________________________________________________________________________________________________
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| user_t | user_home_t | dir | getattr
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| httpd_t | httpd_sys_content_ra_t | file | read
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| user_t | mozilla_t | process | sigchld
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| user_t | self | process | transition
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| mozilla_t | httpd_port_t | tcp_socket | connect
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| unconfined_t | cupsd_t | dbus | send_msg
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| How to find out if selinux is supported /enabled:
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| supported?: http://domg444.blogspot.com/2007/11/how-to-determine-if-our-system-supports.html
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| enabled?: getenforce /selinux/config sestatus
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| explain selinux framework and selinux policy. explain the selinux framework is responsible for enforcing policy.
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| explain the access vector cache.
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| perruse selinux packages ( rpm -ql ) and discuss important locations : /etc/selinux , /selinux
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| How to disable SELinux: i refer to dwalsh blog. some highlights selinux=0 , enforcing=0, setenforce 0,
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| system-config-selinux, semanage
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| system-config-selinux is a GUI for semanage. semanage is THE central managing point for SELinux administration:
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| label file objects ( semanage fcontect -a)
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| label port objects ( semanage port -a) etc
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| explain each optipn of semanage and system-config-selinux: label interfaces, set booleans, add , modify, delete selinux user (groups) and SELinux logins.
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| explain translation ( requires mcstransd )
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| explain what mcstransd does
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| explain what restorecond does
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| explain auditd connection to selinux ( explain ausearch /auctl )
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| show some pratical examples for managing users. add a unconfined user , add a confined user ,
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| add a staff users, assign mcs categories to user (ranges)
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| create custom selinux user groups
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| create custom selinux logins
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| explain booleans
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| explain customizable types
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| mention manual pages for targeted daemons.
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| explain audit2allow
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| explain audit2why
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| explain sesearch and how you can use this to make decisions
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| explain semodule, sestatus , restorecon , semanage, setenforce , getenforce
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| explain limitations of chcon
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| explain advantage of chcon
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| explain chcat
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| explain selinux-policy-devel ( /usr/share/selinux/devel/Makefile )
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| show example how to make a custom policy module
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| explain the limitations of a policy module package
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| explain the advantages of a policy module package
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| explain role base access control and derrived types.
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| explain star and selinux tar support (exmaples)
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| important: Possible problems caused from running in permissive mode, such as having permissions to mislabel files.
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| important: Copying Vs moving files.
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| explain avc denials field by field.
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| explain advantage and limitation of sealert/setroublehoot and how this relates to audit.
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| explain file_t, unlabeled_t
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| explain initrc_t
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| explain unconfined_t
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| explain sepolgen and gui
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| explain why /tmp will not be relabled: http://domg444.blogspot.com/2007/11/why-files-with-incompatible-types-in.html
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| read selinux by example book
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| explain the MLS vs TARGETED
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| explain mcs role in targetted versus mcs role in mls
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| </pre>
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