| 1 |
commit: 51846c0899f8c055fc5f74c33d723eda8380937a |
| 2 |
Author: Sven Vermeulen <sven.vermeulen <AT> siphos <DOT> be> |
| 3 |
AuthorDate: Tue May 3 20:22:50 2011 +0000 |
| 4 |
Commit: Sven Vermeulen <sven.vermeulen <AT> siphos <DOT> be> |
| 5 |
CommitDate: Tue May 3 20:22:50 2011 +0000 |
| 6 |
URL: http://git.overlays.gentoo.org/gitweb/?p=proj/hardened-docs.git;a=commit;h=51846c08 |
| 7 |
|
| 8 |
Add UBAC FAQ |
| 9 |
|
| 10 |
--- |
| 11 |
xml/selinux-faq.xml | 38 ++++++++++++++++++++++++++++++++++++-- |
| 12 |
1 files changed, 36 insertions(+), 2 deletions(-) |
| 13 |
|
| 14 |
diff --git a/xml/selinux-faq.xml b/xml/selinux-faq.xml |
| 15 |
index 3922c94..c815ff4 100644 |
| 16 |
--- a/xml/selinux-faq.xml |
| 17 |
+++ b/xml/selinux-faq.xml |
| 18 |
@@ -17,8 +17,8 @@ The FAQ is a collection of solutions found on IRC, mailinglist, forums or |
| 19 |
elsewhere |
| 20 |
</abstract> |
| 21 |
|
| 22 |
-<version>6</version> |
| 23 |
-<date>2011-05-01</date> |
| 24 |
+<version>7</version> |
| 25 |
+<date>2011-05-03</date> |
| 26 |
|
| 27 |
<faqindex> |
| 28 |
<title>Questions</title> |
| 29 |
@@ -140,6 +140,40 @@ profiles more flexible and support no-multilib soon. |
| 30 |
|
| 31 |
</body> |
| 32 |
</section> |
| 33 |
+<section id="ubac"> |
| 34 |
+<title>What is UBAC exactly?</title> |
| 35 |
+<body> |
| 36 |
+ |
| 37 |
+<p> |
| 38 |
+UBAC, or <e>User Based Access Control</e>, introduces additional constraints |
| 39 |
+when using SELinux policy. Participating domains / types that are <e>both</e> |
| 40 |
+marked as a <c>ubac_constrained_type</c> (which is an attribute) will only |
| 41 |
+have the allowed privileges in effect if they both run with the same SELinux |
| 42 |
+user context. |
| 43 |
+</p> |
| 44 |
+ |
| 45 |
+<pre caption="Domains and their SELinux user context"> |
| 46 |
+<comment># The SELinux allow rule</comment> |
| 47 |
+allow foo_t bar_t:file { read }; |
| 48 |
+ |
| 49 |
+<comment># This will succeed:</comment> |
| 50 |
+staff_u:staff_r:foo_t reads file with type staff_u:object_r:bar_t |
| 51 |
+ |
| 52 |
+<comment># This will be prohibited:</comment> |
| 53 |
+user_u:user_r:foo_t reads file with type staff_u:object_r:bar_t |
| 54 |
+</pre> |
| 55 |
+ |
| 56 |
+<p> |
| 57 |
+Of course, this is not always the case. Besides the earlier mentioned |
| 58 |
+requirement that both types are <c>ubac_constrained_type</c>, if the source |
| 59 |
+domain is <c>sysadm_t</c>, then the constraint will not be in effect (the |
| 60 |
+<c>sysadm_t</c> domain is exempt from UBAC constraints). Also, if the source |
| 61 |
+or destination SELinux user is <c>system_u</c> then the constraint will also |
| 62 |
+not be in effect. |
| 63 |
+</p> |
| 64 |
+ |
| 65 |
+</body> |
| 66 |
+</section> |
| 67 |
</chapter> |
| 68 |
|
| 69 |
<chapter> |
Archives