1firstboot_selinux(8)       SELinux Policy firstboot       firstboot_selinux(8)
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NAME

6       firstboot_selinux  -  Security  Enhanced Linux Policy for the firstboot
7       processes
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DESCRIPTION

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

24       The  firstboot_t  SELinux  type can be entered via the firstboot_exec_t
25       file type.
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27       The default entrypoint paths for the firstboot_t domain are the follow‐
28       ing:
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30       /usr/sbin/firstboot, /usr/share/firstboot/firstboot.py
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PROCESS TYPES

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

53       SELinux  policy is customizable based on least access required.  first‐
54       boot policy is extremely flexible and has several booleans  that  allow
55       you to manipulate the policy and run firstboot with the tightest access
56       possible.
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60       If you want to deny user domains applications to map a memory region as
61       both  executable  and  writable,  this  is dangerous and the executable
62       should be reported in bugzilla, you must turn on the deny_execmem bool‐
63       ean. Enabled by default.
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65       setsebool -P deny_execmem 1
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69       If  you  want  to control the ability to mmap a low area of the address
70       space, as configured by /proc/sys/vm/mmap_min_addr, you  must  turn  on
71       the mmap_low_allowed boolean. Disabled by default.
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73       setsebool -P mmap_low_allowed 1
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77       If  you  want  to  disable  kernel module loading, you must turn on the
78       secure_mode_insmod boolean. Enabled by default.
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80       setsebool -P secure_mode_insmod 1
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84       If you want to allow unconfined executables to make their  heap  memory
85       executable.   Doing  this  is  a  really bad idea. Probably indicates a
86       badly coded executable, but could indicate an attack.  This  executable
87       should   be   reported  in  bugzilla,  you  must  turn  on  the  selin‐
88       uxuser_execheap boolean. Disabled by default.
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90       setsebool -P selinuxuser_execheap 1
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94       If you want to allow unconfined executables to make  their  stack  exe‐
95       cutable.   This  should  never, ever be necessary. Probably indicates a
96       badly coded executable, but could indicate an attack.  This  executable
97       should  be reported in bugzilla, you must turn on the selinuxuser_exec‐
98       stack boolean. Disabled by default.
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100       setsebool -P selinuxuser_execstack 1
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MANAGED FILES

105       The SELinux process type firstboot_t can manage files labeled with  the
106       following file types.  The paths listed are the default paths for these
107       file types.  Note the processes UID still need to have DAC permissions.
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109       file_type
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111            all files on the system
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FILE CONTEXTS

115       SELinux requires files to have an extended attribute to define the file
116       type.
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118       You can see the context of a file using the -Z option to ls
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120       Policy  governs  the  access  confined  processes  have to these files.
121       SELinux firstboot policy is very flexible allowing users to setup their
122       firstboot processes in as secure a method as possible.
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124       STANDARD FILE CONTEXT
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126       SELinux defines the file context types for the firstboot, if you wanted
127       to store files with these types in a diffent paths, you need to execute
128       the  semanage  command  to  sepecify  alternate  labeling  and then use
129       restorecon to put the labels on disk.
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131       semanage  fcontext   -a   -t   firstboot_etc_t   '/srv/myfirstboot_con‐
132       tent(/.*)?'
133       restorecon -R -v /srv/myfirstboot_content
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135       Note:  SELinux  often  uses  regular expressions to specify labels that
136       match multiple files.
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138       The following file types are defined for firstboot:
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142       firstboot_etc_t
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144       - Set files with the firstboot_etc_t type, if you want to store  first‐
145       boot files in the /etc directories.
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149       firstboot_exec_t
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151       -  Set  files with the firstboot_exec_t type, if you want to transition
152       an executable to the firstboot_t domain.
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155       Paths:
156            /usr/sbin/firstboot, /usr/share/firstboot/firstboot.py
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159       Note: File context can be temporarily modified with the chcon  command.
160       If  you want to permanently change the file context you need to use the
161       semanage fcontext command.  This will modify the SELinux labeling data‐
162       base.  You will need to use restorecon to apply the labels.
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COMMANDS

166       semanage  fcontext  can also be used to manipulate default file context
167       mappings.
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169       semanage permissive can also be used to manipulate  whether  or  not  a
170       process type is permissive.
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172       semanage  module can also be used to enable/disable/install/remove pol‐
173       icy modules.
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175       semanage boolean can also be used to manipulate the booleans
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178       system-config-selinux is a GUI tool available to customize SELinux pol‐
179       icy settings.
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AUTHOR

183       This manual page was auto-generated using sepolicy manpage .
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SEE ALSO

187       selinux(8),  firstboot(8), semanage(8), restorecon(8), chcon(1), sepol‐
188       icy(8), setsebool(8)
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192firstboot                          21-03-26               firstboot_selinux(8)
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