bootloader_selinux(8)

1bootloader_selinux(8)      SELinux Policy bootloader     bootloader_selinux(8)
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NAME

6       bootloader_selinux  - Security Enhanced Linux Policy for the bootloader
7       processes
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DESCRIPTION

10       Security-Enhanced Linux secures the bootloader processes  via  flexible
11       mandatory access control.
12
13       The  bootloader  processes  execute with the bootloader_t SELinux type.
14       You can check if you have these processes running by executing  the  ps
15       command with the -Z qualifier.
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17       For example:
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19       ps -eZ | grep bootloader_t
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ENTRYPOINTS

24       The  bootloader_t SELinux type can be entered via the bootloader_exec_t
25       file type.
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27       The default entrypoint paths for the bootloader_t domain are  the  fol‐
28       lowing:
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30       /sbin/grub.*,     /sbin/lilo.*,     /sbin/ybin.*,     /usr/sbin/grub.*,
31       /usr/sbin/lilo.*, /usr/sbin/ybin.*, /sbin/zipl, /usr/sbin/zipl
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PROCESS TYPES

34       SELinux defines process types (domains) for each process running on the
35       system
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37       You can see the context of a process using the -Z option to ps
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39       Policy  governs  the  access confined processes have to files.  SELinux
40       bootloader policy is very flexible allowing users to setup their  boot‐
41       loader processes in as secure a method as possible.
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43       The following process types are defined for bootloader:
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45       bootloader_t
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47       Note:  semanage  permissive  -a  bootloader_t  can  be used to make the
48       process type bootloader_t permissive. SELinux does not deny  access  to
49       permissive  process  types,  but the AVC (SELinux denials) messages are
50       still generated.
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BOOLEANS

54       SELinux policy is customizable based on least access  required.   boot‐
55       loader policy is extremely flexible and has several booleans that allow
56       you to manipulate the policy  and  run  bootloader  with  the  tightest
57       access possible.
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61       If you want to allow users to resolve user passwd entries directly from
62       ldap rather then using a sssd server, you  must  turn  on  the  authlo‐
63       gin_nsswitch_use_ldap boolean. Disabled by default.
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65       setsebool -P authlogin_nsswitch_use_ldap 1
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69       If you want to deny user domains applications to map a memory region as
70       both executable and writable, this  is  dangerous  and  the  executable
71       should be reported in bugzilla, you must turn on the deny_execmem bool‐
72       ean. Enabled by default.
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74       setsebool -P deny_execmem 1
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78       If you want to allow all domains to execute in fips_mode, you must turn
79       on the fips_mode boolean. Enabled by default.
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81       setsebool -P fips_mode 1
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85       If  you  want to allow s-c-kdump to run bootloader in bootloader_t, you
86       must turn on the kdumpgui_run_bootloader boolean. Disabled by default.
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88       setsebool -P kdumpgui_run_bootloader 1
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92       If you want to allow confined applications to run  with  kerberos,  you
93       must turn on the kerberos_enabled boolean. Enabled by default.
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95       setsebool -P kerberos_enabled 1
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99       If  you  want  to control the ability to mmap a low area of the address
100       space, as configured by /proc/sys/vm/mmap_min_addr, you  must  turn  on
101       the mmap_low_allowed boolean. Disabled by default.
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103       setsebool -P mmap_low_allowed 1
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107       If  you  want  to  allow  system  to run with NIS, you must turn on the
108       nis_enabled boolean. Disabled by default.
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110       setsebool -P nis_enabled 1
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114       If you want to allow confined applications to use nscd  shared  memory,
115       you must turn on the nscd_use_shm boolean. Disabled by default.
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117       setsebool -P nscd_use_shm 1
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121       If  you  want  to  disable  kernel module loading, you must turn on the
122       secure_mode_insmod boolean. Enabled by default.
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124       setsebool -P secure_mode_insmod 1
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128       If you want to allow unconfined executables to make their  heap  memory
129       executable.   Doing  this  is  a  really bad idea. Probably indicates a
130       badly coded executable, but could indicate an attack.  This  executable
131       should   be   reported  in  bugzilla,  you  must  turn  on  the  selin‐
132       uxuser_execheap boolean. Disabled by default.
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134       setsebool -P selinuxuser_execheap 1
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137
138       If you want to allow unconfined executables to make  their  stack  exe‐
139       cutable.   This  should  never, ever be necessary. Probably indicates a
140       badly coded executable, but could indicate an attack.  This  executable
141       should  be reported in bugzilla, you must turn on the selinuxuser_exec‐
142       stack boolean. Enabled by default.
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144       setsebool -P selinuxuser_execstack 1
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MANAGED FILES

149       The SELinux process type bootloader_t can manage files labeled with the
150       following file types.  The paths listed are the default paths for these
151       file types.  Note the processes UID still need to have DAC permissions.
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153       file_type
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155            all files on the system
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FILE CONTEXTS

159       SELinux requires files to have an extended attribute to define the file
160       type.
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162       You can see the context of a file using the -Z option to ls
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164       Policy  governs  the  access  confined  processes  have to these files.
165       SELinux bootloader policy is very  flexible  allowing  users  to  setup
166       their bootloader processes in as secure a method as possible.
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168       STANDARD FILE CONTEXT
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170       SELinux  defines  the  file  context  types  for the bootloader, if you
171       wanted to store files with these types in a diffent paths, you need  to
172       execute  the  semanage  command to sepecify alternate labeling and then
173       use restorecon to put the labels on disk.
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175       semanage  fcontext  -a  -t   bootloader_tmp_t   '/srv/mybootloader_con‐
176       tent(/.*)?'
177       restorecon -R -v /srv/mybootloader_content
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179       Note:  SELinux  often  uses  regular expressions to specify labels that
180       match multiple files.
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182       The following file types are defined for bootloader:
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186       bootloader_etc_t
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188       - Set files with the bootloader_etc_t type, if you want to store  boot‐
189       loader files in the /etc directories.
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192       Paths:
193            /etc/lilo.conf.*,       /etc/zipl.conf.*,      /etc/yaboot.conf.*,
194            /etc/default/grub
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197       bootloader_exec_t
198
199       - Set files with the bootloader_exec_t type, if you want to  transition
200       an executable to the bootloader_t domain.
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202
203       Paths:
204            /sbin/grub.*,    /sbin/lilo.*,   /sbin/ybin.*,   /usr/sbin/grub.*,
205            /usr/sbin/lilo.*, /usr/sbin/ybin.*, /sbin/zipl, /usr/sbin/zipl
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208       bootloader_tmp_t
209
210       - Set files with the bootloader_tmp_t type, if you want to store  boot‐
211       loader temporary files in the /tmp directories.
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215       bootloader_var_lib_t
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217       -  Set  files  with the bootloader_var_lib_t type, if you want to store
218       the bootloader files under the /var/lib directory.
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222       bootloader_var_run_t
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224       - Set files with the bootloader_var_run_t type, if you  want  to  store
225       the bootloader files under the /run or /var/run directory.
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229       Note:  File context can be temporarily modified with the chcon command.
230       If you want to permanently change the file context you need to use  the
231       semanage fcontext command.  This will modify the SELinux labeling data‐
232       base.  You will need to use restorecon to apply the labels.
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COMMANDS

236       semanage fcontext can also be used to manipulate default  file  context
237       mappings.
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239       semanage  permissive  can  also  be used to manipulate whether or not a
240       process type is permissive.
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242       semanage module can also be used to enable/disable/install/remove  pol‐
243       icy modules.
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245       semanage boolean can also be used to manipulate the booleans
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247
248       system-config-selinux is a GUI tool available to customize SELinux pol‐
249       icy settings.
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AUTHOR

253       This manual page was auto-generated using sepolicy manpage .
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