sandbox_selinux(8)

1sandbox_selinux(8)          SELinux Policy sandbox          sandbox_selinux(8)
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NAME

6       sandbox_selinux  -  Security Enhanced Linux Policy for the sandbox pro‐
7       cesses
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DESCRIPTION

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

24       The sandbox_t SELinux type can be entered via the file_type file type.
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26       The  default  entrypoint paths for the sandbox_t domain are the follow‐
27       ing:
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29       all files on the system
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PROCESS TYPES

32       SELinux defines process types (domains) for each process running on the
33       system
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35       You can see the context of a process using the -Z option to ps
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37       Policy  governs  the  access confined processes have to files.  SELinux
38       sandbox policy is very flexible allowing users to setup  their  sandbox
39       processes in as secure a method as possible.
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41       The following process types are defined for sandbox:
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43       sandbox_t, sandbox_xserver_t, sandbox_min_t, sandbox_min_client_t, sandbox_x_t, sandbox_x_client_t, sandbox_web_t, sandbox_web_client_t, sandbox_net_t, sandbox_net_client_t
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45       Note:  semanage permissive -a sandbox_t can be used to make the process
46       type sandbox_t permissive. SELinux does not deny access  to  permissive
47       process  types, but the AVC (SELinux denials) messages are still gener‐
48       ated.
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MCS Constrained

52       The SELinux process type sandbox_t is an MCS (Multi Category  Security)
53       constrained  type.   Sometimes this separation is referred to as sVirt.
54       These types are usually used for  securing  multi-tenant  environments,
55       such  as  virtualization, containers or separation of users.  The tools
56       used to launch MCS types, pick out  a  different  MCS  label  for  each
57       process group.
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59       For  example one process might be launched with sandbox_t:s0:c1,c2, and
60       another process launched with sandbox_t:s0:c3,c4.  The  SELinux  kernel
61       only  allows  these processes can only write to content with a matching
62       MCS label, or a MCS Label of s0. A process running with the  MCS  level
63       of  s0:c1,c2  is  not allowed to write to content with the MCS label of
64       s0:c3,c4
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BOOLEANS

68       SELinux policy is customizable based on least access required.  sandbox
69       policy is extremely flexible and has several booleans that allow you to
70       manipulate the policy and run sandbox with the tightest  access  possi‐
71       ble.
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75       If you want to deny user domains applications to map a memory region as
76       both executable and writable, this  is  dangerous  and  the  executable
77       should be reported in bugzilla, you must turn on the deny_execmem bool‐
78       ean. Enabled by default.
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80       setsebool -P deny_execmem 1
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84       If you want to deny any process from ptracing or  debugging  any  other
85       processes,  you  must  turn  on  the  deny_ptrace  boolean.  Enabled by
86       default.
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88       setsebool -P deny_ptrace 1
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92       If you want to allow any process  to  mmap  any  file  on  system  with
93       attribute  file_type,  you must turn on the domain_can_mmap_files bool‐
94       ean. Enabled by default.
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96       setsebool -P domain_can_mmap_files 1
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100       If you want to allow all domains write to kmsg_device, while kernel  is
101       executed  with  systemd.log_target=kmsg parameter, you must turn on the
102       domain_can_write_kmsg boolean. Disabled by default.
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104       setsebool -P domain_can_write_kmsg 1
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108       If you want to allow all domains to use other domains file descriptors,
109       you must turn on the domain_fd_use boolean. Enabled by default.
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111       setsebool -P domain_fd_use 1
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115       If  you  want to allow all domains to have the kernel load modules, you
116       must  turn  on  the  domain_kernel_load_modules  boolean.  Disabled  by
117       default.
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119       setsebool -P domain_kernel_load_modules 1
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123       If you want to allow all domains to execute in fips_mode, you must turn
124       on the fips_mode boolean. Enabled by default.
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126       setsebool -P fips_mode 1
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130       If you want to enable reading of urandom for all domains, you must turn
131       on the global_ssp boolean. Disabled by default.
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133       setsebool -P global_ssp 1
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MANAGED FILES

138       The  SELinux  process  type sandbox_t can manage files labeled with the
139       following file types.  The paths listed are the default paths for these
140       file types.  Note the processes UID still need to have DAC permissions.
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142       sandbox_file_t
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145       sandbox_tmpfs_type
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147            all sandbox content in tmpfs file systems
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FILE CONTEXTS

151       SELinux requires files to have an extended attribute to define the file
152       type.
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154       You can see the context of a file using the -Z option to ls
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156       Policy governs the access  confined  processes  have  to  these  files.
157       SELinux  sandbox  policy is very flexible allowing users to setup their
158       sandbox processes in as secure a method as possible.
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160       STANDARD FILE CONTEXT
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162       SELinux defines the file context types for the sandbox, if  you  wanted
163       to store files with these types in a diffent paths, you need to execute
164       the semanage command  to  sepecify  alternate  labeling  and  then  use
165       restorecon to put the labels on disk.
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167       semanage  fcontext  -a  -t sandbox_xserver_tmpfs_t '/srv/mysandbox_con‐
168       tent(/.*)?'
169       restorecon -R -v /srv/mysandbox_content
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171       Note: SELinux often uses regular expressions  to  specify  labels  that
172       match multiple files.
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174       The following file types are defined for sandbox:
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178       sandbox_devpts_t
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180       -  Set  files  with the sandbox_devpts_t type, if you want to treat the
181       files as sandbox devpts data.
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185       sandbox_exec_t
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187       - Set files with the sandbox_exec_t type, if you want to transition  an
188       executable to the sandbox_t domain.
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192       sandbox_file_t
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194       -  Set  files  with  the  sandbox_file_t type, if you want to treat the
195       files as sandbox content.
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199       sandbox_min_client_tmpfs_t
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201       - Set files with the sandbox_min_client_tmpfs_t type, if  you  want  to
202       store sandbox min client files on a tmpfs file system.
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206       sandbox_net_client_tmpfs_t
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208       -  Set  files  with the sandbox_net_client_tmpfs_t type, if you want to
209       store sandbox net client files on a tmpfs file system.
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213       sandbox_web_client_tmpfs_t
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215       - Set files with the sandbox_web_client_tmpfs_t type, if  you  want  to
216       store sandbox web client files on a tmpfs file system.
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220       sandbox_x_client_tmpfs_t
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222       -  Set  files  with  the  sandbox_x_client_tmpfs_t type, if you want to
223       store sandbox x client files on a tmpfs file system.
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227       sandbox_xserver_tmpfs_t
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229       - Set files with the sandbox_xserver_tmpfs_t type, if you want to store
230       sandbox xserver files on a tmpfs file system.
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234       Note:  File context can be temporarily modified with the chcon command.
235       If you want to permanently change the file context you need to use  the
236       semanage fcontext command.  This will modify the SELinux labeling data‐
237       base.  You will need to use restorecon to apply the labels.
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COMMANDS

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

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