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 allow all domains to execute in fips_mode, you must turn
70       on the fips_mode boolean. Enabled by default.
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72       setsebool -P fips_mode 1
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76       If you want to control the ability to mmap a low area  of  the  address
77       space,  as  configured  by /proc/sys/vm/mmap_min_addr, you must turn on
78       the mmap_low_allowed boolean. Disabled by default.
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80       setsebool -P mmap_low_allowed 1
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84       If you want to allow confined applications to use nscd  shared  memory,
85       you must turn on the nscd_use_shm boolean. Disabled by default.
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87       setsebool -P nscd_use_shm 1
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91       If  you  want  to  disable  kernel module loading, you must turn on the
92       secure_mode_insmod boolean. Enabled by default.
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94       setsebool -P secure_mode_insmod 1
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98       If you want to allow unconfined executables to make their  heap  memory
99       executable.   Doing  this  is  a  really bad idea. Probably indicates a
100       badly coded executable, but could indicate an attack.  This  executable
101       should   be   reported  in  bugzilla,  you  must  turn  on  the  selin‐
102       uxuser_execheap boolean. Disabled by default.
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104       setsebool -P selinuxuser_execheap 1
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108       If you want to allow unconfined executables to make  their  stack  exe‐
109       cutable.   This  should  never, ever be necessary. Probably indicates a
110       badly coded executable, but could indicate an attack.  This  executable
111       should  be reported in bugzilla, you must turn on the selinuxuser_exec‐
112       stack boolean. Disabled by default.
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114       setsebool -P selinuxuser_execstack 1
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MANAGED FILES

119       The SELinux process type firstboot_t can manage files labeled with  the
120       following file types.  The paths listed are the default paths for these
121       file types.  Note the processes UID still need to have DAC permissions.
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123       file_type
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125            all files on the system
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FILE CONTEXTS

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

180       semanage  fcontext  can also be used to manipulate default file context
181       mappings.
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183       semanage permissive can also be used to manipulate  whether  or  not  a
184       process type is permissive.
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186       semanage  module can also be used to enable/disable/install/remove pol‐
187       icy modules.
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189       semanage boolean can also be used to manipulate the booleans
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192       system-config-selinux is a GUI tool available to customize SELinux pol‐
193       icy settings.
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AUTHOR

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

201       selinux(8),  firstboot(8), semanage(8), restorecon(8), chcon(1), sepol‐
202       icy(8), setsebool(8)
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206firstboot                          19-12-02               firstboot_selinux(8)
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