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Notes for TOMOYO Linux project |
Notes for TOMOYO Linux project |
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This is a handy Mandatory Access Control patch for Linux kernels. |
This is a handy Mandatory Access Control patch for Linux kernels. |
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This patch is released under the GPL. |
This patch is released under the GPLv2. |
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Project URL: http://tomoyo.sourceforge.jp/ |
Project URL: http://tomoyo.sourceforge.jp/ |
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By default, this handler does nothing (i.e. merely reject execve() |
By default, this handler does nothing (i.e. merely reject execve() |
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request). You can specify any program to start what you want to do. |
request). You can specify any program to start what you want to do. |
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You can redirect attackers to somewhere else (e.g. honeypot). |
You can redirect attackers to somewhere else (e.g. honey pot). |
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This makes it possible to act your Linux box as an on-demand honeypot |
This makes it possible to act your Linux box as an on-demand honey pot |
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while keeping regular services for your usage. |
while keeping regular services for your usage. |
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You can collect information of the attacker (e.g. IP address) and |
You can collect information of the attacker (e.g. IP address) and |
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to the caller to tell the execute request was rejected, |
to the caller to tell the execute request was rejected, |
| 1278 |
this is more flexible approach than in-kernel execve() parameter |
this is more flexible approach than in-kernel execve() parameter |
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checking because we can do argv[] and envp[] checking easily. |
checking because we can do argv[] and envp[] checking easily. |
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| 1281 |
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Fix 2008/03/04 |
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| 1283 |
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@ Use string for access control mode. |
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An integer expression for access control mode sometimes confuses |
| 1286 |
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administrators because profile number is also an integer expression. |
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To avoid confusion between profile number and access control mode, |
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I introduced a string expression for access control mode. |
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| 1290 |
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Modes which take an integer between 0 and 3. |
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0 -> disabled |
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1 -> learning |
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2 -> permissive |
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3 -> enforcing |
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Modes which take 0 or 1. |
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0 -> disabled |
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1 -> enabled |
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Fix 2008/03/10 |
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@ Rename "force_alt_exec" keyword to "execute_handler". |
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To be able to use different programs for validating execve() parameters, |
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I moved the location to specify the program's pathname from profile |
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to domain policy. |
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| 1310 |
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The "execute_handler" keyword takes one pathname which is |
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invoked whenever execve() request is issued. Thus, any "allow_execute" |
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keywords in a domain with "execute_handler" are ignored. |
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This keyword is designed for validating expected/desirable execve() |
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requests in userspace, although there is no way to tell the caller |
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that the execve() request was rejected. |
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@ Rename "alt_exec" keyword to "denied_execute_handler". |
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The "denied_execute_handler" keyword takes one pathname which is |
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invoked only when execve() request was rejected. In other words, |
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this program is invoked only when the following conditions are met. |
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(1) None of "allow_execute" keywords in the domain matched. |
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(2) The execve() request was rejected in enforcing mode. |
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(3) "execute_handler" keyword is not used by the domain. |
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This keyword is designed for handling unexpected/undesirable execve() |
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requests, to redirect the process issuing such requests to somewhere. |
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Fix 2008/03/18 |
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| 1332 |
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@ Fix wrong/redundant locks in pre-vfs functions. |
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lock_kernel()/unlock_kernel() in pre_vfs_rename() were redundant for |
| 1335 |
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2.6 kernels. |
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Locking order in pre_vfs_link() and pre_vfs_unlink() for 2.4 kernels |
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after 2.4.33 were different from before 2.4.32 . |
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Fix 2008/03/28 |
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@ Disable execute handler loop. |
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To be able to use "execute_handler" in a "keep_domain" domain, |
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ignore "execute_handler" and "denied_execute_handler" keywords |
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if the current process is executing programs specified by |
| 1347 |
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"execute_handler" or "denied_execute_handler" keyword. |
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This exception is needed to avoid infinite execute handler loop. |
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If a domain has both "keep_domain" and "execute_handler", |
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any execute request by that domain is handled by an execute handler, |
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and the execute handler attempts to process original execute request. |
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But the original execute request is handled by the same execute handler |
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unless the execute handler ignores "execute_handler". |
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@ Update coding style. |
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I rewrote the code to pass scripts/checkpatch.pl as much as possible. |
| 1359 |
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Function names were changed to use only lower letters. |
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Version 1.6.0 2008/04/01 Feature enhancement release. |
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| 1363 |
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Fix 2008/??/?? |
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@ Fix "Compilation failures" and "Initialization ordering bugs" |
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with kernels before 2.4.30/2.6.11 . |
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2.6 kernels before 2.6.9 didn't have include/linux/hardirq.h , |
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resulting compilation error at #include <linux/hardirq.h> . |
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I added #elif condition. |
| 1371 |
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| 1372 |
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2.6 kernels before 2.6.11 calls do_execve() before initialization of |
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ccs_alloc(), resulting NULL pointer dereference. |
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I changed __initcall to fs_initcall. |
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Some distributions with 2.6.9 kernels backported kzalloc() from 2.6.14 , |
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resulting compilation error at kzalloc(). |
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I modified prototype of kzalloc(). |
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