如何查看 SELinux 策略包的內容

如標題所述，如何查看 SELinux 策略包的內容？生成的文件以 .pp 結尾。我在 centos 6 上執行，但我想在“所有”發行版上都是一樣的。

例如

   cp /usr/share/selinux/targeted/cobbler.pp.bz2 ~
   bunzip2 cobbler.pp.bz2 
   MAGIC_SELINUX_CMD cobbler.pp

SELinux 策略模組通過以下步驟建構：

1. 生成一組策略規則：audit2allow
2. 編譯：checkmodule
3. 建造：semodule_package

http://wiki.centos.org/HowTos/SELinux

假設我有一個postgreylocal.te包含以下內容的文件：

module postgreylocal 1.0;
require {
       type postfix_smtpd_t;
       type postfix_spool_t;
       type initrc_t;
       class sock_file write;
       class unix_stream_socket connectto;
}
#============= postfix_smtpd_t ==============
allow postfix_smtpd_t initrc_t:unix_stream_socket connectto;
allow postfix_smtpd_t postfix_spool_t:sock_file write; 

postgreylocal.pp策略模組將使用以下內容創建：

# checkmodule -M -m -o postgreylocal.mod postgreylocal.te
# semodule_package -m postgreylocal.mod -o postgreylocal.pp 

要解壓此策略模組，您需要一個名為semodule_unpackage的工具來提取.mod文件，然後使用dismod將二進制模組反彙編為文本表示。

在我的 Gentoo 上，需要安裝以下軟體包：

[I] sys-apps/policycoreutils
    Available versions:  [M]2.0.82 [M](~)2.0.82-r1 [M](~)2.0.85 [M](~)2.1.0 {M}(~)2.1.0-r1
    Installed versions:  2.1.0-r1(05:12:27 PM 10/14/2011)
    Homepage:            http://userspace.selinuxproject.org
    Description:         SELinux core utilities

[I] sys-apps/checkpolicy
    Available versions:  [M]2.0.21 [M](~)2.0.23 {M}(~)2.1.0 {debug}
    Installed versions:  2.1.0(01:27:53 PM 10/14/2011)(-debug)
    Homepage:            http://userspace.selinuxproject.org
    Description:         SELinux policy compiler

[I] sys-libs/libsepol
    Available versions:  [M]2.0.41!t [M](~)2.0.42!t {M}(~)2.1.0!t
    Installed versions:  2.1.0!t(01:25:43 PM 10/14/2011)
    Homepage:            http://userspace.selinuxproject.org
    Description:         SELinux binary policy representation library

.pp首先，從文件中提取模組：

# semodule_unpackage postgreylocal.pp postgreylocal.mod

其次，拆卸dismod：

# cd checkpolicy-2.1.0/test/
# ls
dismod.c  dispol.c  Makefile
# make
cc -g -Wall -O2 -pipe -I/usr/include   -c -o dispol.o dispol.c
dispol.c: In function ‘main’:
dispol.c:438:8: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result
dispol.c:465:9: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result
dispol.c:476:9: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result
dispol.c:500:9: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result
cc   dispol.o  -lfl -lsepol -lselinux /usr/lib/libsepol.a -L/usr/lib -o dispol
cc -g -Wall -O2 -pipe -I/usr/include   -c -o dismod.o dismod.c
dismod.c: In function ‘main’:
dismod.c:913:8: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result
dismod.c:982:9: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result
dismod.c: In function ‘link_module’:
dismod.c:787:7: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result
cc   dismod.o  -lfl -lsepol -lselinux /usr/lib/libsepol.a -L/usr/lib -o dismod
# ls
dismod  dismod.c  dismod.o  dispol  dispol.c  dispol.o  Makefile

---

./dismod postgreylocal.pp
Reading policy...
libsepol.policydb_index_others: security:  0 users, 1 roles, 3 types, 0 bools
libsepol.policydb_index_others: security: 0 sens, 0 cats
libsepol.policydb_index_others: security:  2 classes, 0 rules, 0 cond rules
libsepol.policydb_index_others: security:  0 users, 1 roles, 3 types, 0 bools
libsepol.policydb_index_others: security: 0 sens, 0 cats
libsepol.policydb_index_others: security:  2 classes, 0 rules, 0 cond rules
Binary policy module file loaded.
Module name: postgreylocal
Module version: 1.0


Select a command:
1)  display unconditional AVTAB
2)  display conditional AVTAB
3)  display users
4)  display bools
5)  display roles
6)  display types, attributes, and aliases
7)  display role transitions
8)  display role allows
9)  Display policycon
0)  Display initial SIDs

a)  Display avrule requirements
b)  Display avrule declarations
c)  Display policy capabilities
l)  Link in a module
u)  Display the unknown handling setting
F)  Display filename_trans rules

f)  set output file
m)  display menu
q)  quit

---

Command ('m' for menu):  1
unconditional avtab:
--- begin avrule block ---
decl 1:
 allow [postfix_smtpd_t] [initrc_t] : [unix_stream_socket] { connectto };
 allow [postfix_smtpd_t] [postfix_spool_t] : [sock_file] { write };

Command ('m' for menu):  a
avrule block requirements:
--- begin avrule block ---
decl 1:
commons: <empty>
classes: sock_file{  write } unix_stream_socket{  connectto }
roles  : <empty>
types  : postfix_smtpd_t postfix_spool_t initrc_t
users  : <empty>
bools  : <empty>
levels : <empty>
cats   : <empty>

Command ('m' for menu):  

引用自：https://serverfault.com/questions/321301