sysadm_selinux(8)

1sysadm_selinux(8)     sysadm SELinux Policy documentation    sysadm_selinux(8)
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NAME

6       sysadm_u - General system administration role - Security Enhanced Linux
7       Policy
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DESCRIPTION

11       sysadm_u is an SELinux User defined  in  the  SELinux  policy.  SELinux
12       users  have  default  roles,  sysadm_r.  The default role has a default
13       type, sysadm_t, associated with it.
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15       The SELinux user will usually login to a system  with  a  context  that
16       looks like:
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18       sysadm_u:sysadm_r:sysadm_t:s0 - s0:c0.c1023
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20       Linux  users are automatically assigned an SELinux users at login.  Lo‐
21       gin programs use the SELinux User to  assign  initial  context  to  the
22       user's shell.
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24       SELinux policy uses the context to control the user's access.
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26       By  default  all  users  are assigned to the SELinux user via the __de‐
27       fault__ flag
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29       On Targeted policy systems the __default__ user is assigned to the  un‐
30       confined_u SELinux user.
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32       You can list all Linux User to SELinux user mapping using:
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34       semanage login -l
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36       If  you  wanted  to change the default user mapping to use the sysadm_u
37       user, you would execute:
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39       semanage login -m -s sysadm_u __default__
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42       If you want to map the one Linux user (joe) to the SELinux user sysadm,
43       you would execute:
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45       $ semanage login -a -s sysadm_u joe
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USER DESCRIPTION

50       The  SELinux  user  sysadm_u  is  an admin user. It means that a mapped
51       Linux user to this SELinux user is intended for administrative actions.
52       Usually this is assigned to a root Linux user.
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SUDO

56       The SELinux user sysadm can execute sudo.
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58       You  can set up sudo to allow sysadm to transition to an administrative
59       domain:
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61       Add one or more of the following record to sudoers using visudo.
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64       USERNAME ALL=(ALL) ROLE=user_r TYPE=user_t COMMAND
65       sudo will run COMMAND as sysadm_u:user_r:user_t:LEVEL
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67       You might also need to add one or more  of  these  new  roles  to  your
68       SELinux user record.
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70       List the SELinux roles your SELinux user can reach by executing:
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72       $ semanage user -l |grep selinux_name
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74       Modify the roles list and add sysadm_r to this list.
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76       $  semanage  user  -m  -R 'sysadm_r user_r staff_r secadm_r auditadm_r'
77       sysadm_u
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79       For more details you can see semanage man page.
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82       USERNAME ALL=(ALL) ROLE=staff_r TYPE=staff_t COMMAND
83       sudo will run COMMAND as sysadm_u:staff_r:staff_t:LEVEL
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85       You might also need to add one or more  of  these  new  roles  to  your
86       SELinux user record.
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88       List the SELinux roles your SELinux user can reach by executing:
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90       $ semanage user -l |grep selinux_name
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92       Modify the roles list and add sysadm_r to this list.
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94       $  semanage  user  -m  -R 'sysadm_r user_r staff_r secadm_r auditadm_r'
95       sysadm_u
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97       For more details you can see semanage man page.
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100       USERNAME ALL=(ALL) ROLE=secadm_r TYPE=secadm_t COMMAND
101       sudo will run COMMAND as sysadm_u:secadm_r:secadm_t:LEVEL
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103       You might also need to add one or more  of  these  new  roles  to  your
104       SELinux user record.
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106       List the SELinux roles your SELinux user can reach by executing:
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108       $ semanage user -l |grep selinux_name
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110       Modify the roles list and add sysadm_r to this list.
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112       $  semanage  user  -m  -R 'sysadm_r user_r staff_r secadm_r auditadm_r'
113       sysadm_u
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115       For more details you can see semanage man page.
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118       USERNAME ALL=(ALL) ROLE=auditadm_r TYPE=auditadm_t COMMAND
119       sudo will run COMMAND as sysadm_u:auditadm_r:auditadm_t:LEVEL
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121       You might also need to add one or more  of  these  new  roles  to  your
122       SELinux user record.
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124       List the SELinux roles your SELinux user can reach by executing:
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126       $ semanage user -l |grep selinux_name
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128       Modify the roles list and add sysadm_r to this list.
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130       $  semanage  user  -m  -R 'sysadm_r user_r staff_r secadm_r auditadm_r'
131       sysadm_u
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133       For more details you can see semanage man page.
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136       The SELinux type sysadm_t is not allowed to execute sudo.
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X WINDOWS LOGIN

140       The SELinux user sysadm_u is able to X Windows login.
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NETWORK

144       The SELinux user sysadm_u is able to listen on the following tcp ports.
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146              all ports >= 512 and < 1024
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148              1716
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150              all ports without defined types
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152              32768-60999
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154              all ports >= 1024
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157       The SELinux user sysadm_u is able  to  connect  to  the  following  tcp
158       ports.
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160              all ports
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162              8955
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164              53,853
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166              389,636,3268,3269,7389
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168              all ports without defined types
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170              32768-60999
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172              all ports < 1024
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174              9080
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176              88,750,4444
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179       The SELinux user sysadm_u is able to listen on the following udp ports.
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181              32768-60999
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183              all ports without defined types
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185              123
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187              all ports >= 1024
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190       The  SELinux  user  sysadm_u  is  able  to connect to the following tcp
191       ports.
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193              all ports
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195              8955
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197              53,853
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199              389,636,3268,3269,7389
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201              all ports without defined types
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203              32768-60999
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205              all ports < 1024
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207              9080
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209              88,750,4444
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BOOLEANS

213       SELinux policy is customizable based on least access required.   sysadm
214       policy is extremely flexible and has several booleans that allow you to
215       manipulate the policy and run sysadm with the tightest access possible.
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219       If you want to determine whether crond can execute jobs in the user do‐
220       main as opposed to the the generic cronjob domain, you must turn on the
221       cron_userdomain_transition boolean. Enabled by default.
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223       setsebool -P cron_userdomain_transition 1
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227       If you want to deny all system processes and Linux users to  use  blue‐
228       tooth wireless technology, you must turn on the deny_bluetooth boolean.
229       Enabled by default.
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231       setsebool -P deny_bluetooth 1
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235       If you want to deny user domains applications to map a memory region as
236       both  executable  and  writable,  this  is dangerous and the executable
237       should be reported in bugzilla, you must turn on the deny_execmem bool‐
238       ean. Enabled by default.
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240       setsebool -P deny_execmem 1
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244       If  you  want  to deny any process from ptracing or debugging any other
245       processes, you must turn on the deny_ptrace  boolean.  Enabled  by  de‐
246       fault.
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248       setsebool -P deny_ptrace 1
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252       If you want to allow all domains to execute in fips_mode, you must turn
253       on the fips_mode boolean. Enabled by default.
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255       setsebool -P fips_mode 1
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259       If you want to determine whether calling user domains can  execute  Git
260       daemon  in  the  git_session_t  domain,  you  must turn on the git_ses‐
261       sion_users boolean. Disabled by default.
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263       setsebool -P git_session_users 1
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267       If you want to determine  whether  calling  user  domains  can  execute
268       Polipo  daemon  in  the  polipo_session_t  domain, you must turn on the
269       polipo_session_users boolean. Disabled by default.
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271       setsebool -P polipo_session_users 1
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275       If you want to disable kernel module loading, you must turn on the  se‐
276       cure_mode_insmod boolean. Enabled by default.
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278       setsebool -P secure_mode_insmod 1
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282       If  you  want  to allow unconfined executables to make their stack exe‐
283       cutable.  This should never, ever be necessary.  Probably  indicates  a
284       badly  coded  executable, but could indicate an attack. This executable
285       should be reported in bugzilla, you must turn on the  selinuxuser_exec‐
286       stack boolean. Enabled by default.
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288       setsebool -P selinuxuser_execstack 1
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292       If  you want to allow user to r/w files on filesystems that do not have
293       extended attributes (FAT, CDROM, FLOPPY), you must turn on  the  selin‐
294       uxuser_rw_noexattrfile boolean. Enabled by default.
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296       setsebool -P selinuxuser_rw_noexattrfile 1
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300       If you want to allow users to run TCP servers (bind to ports and accept
301       connection from the same domain  and  outside  users)   disabling  this
302       forces  FTP  passive mode and may change other protocols, you must turn
303       on the selinuxuser_tcp_server boolean. Disabled by default.
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305       setsebool -P selinuxuser_tcp_server 1
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309       If you want to allow users to run UDP servers (bind to ports and accept
310       connection  from the same domain and outside users)  disabling this may
311       break avahi discovering services on the network and other  udp  related
312       services, you must turn on the selinuxuser_udp_server boolean. Disabled
313       by default.
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315       setsebool -P selinuxuser_udp_server 1
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HOME_EXEC

320       The SELinux user sysadm_u is able execute home content files.
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TRANSITIONS

324       Three things can happen when sysadm_t attempts to execute a program.
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326       1. SELinux Policy can deny sysadm_t from executing the program.
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330       2. SELinux Policy can allow sysadm_t to execute the program in the cur‐
331       rent user type.
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333              Execute  the  following  to  see the types that the SELinux user
334              sysadm_t can execute without transitioning:
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336              sesearch -A -s sysadm_t -c file -p execute_no_trans
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340       3. SELinux can allow sysadm_t to execute the program and transition  to
341       a new type.
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343              Execute  the  following  to  see the types that the SELinux user
344              sysadm_t can execute and transition:
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346              $ sesearch -A -s sysadm_t -c process -p transition
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MANAGED FILES

351       The SELinux process type sysadm_t can manage  files  labeled  with  the
352       following file types.  The paths listed are the default paths for these
353       file types.  Note the processes UID still need to have DAC permissions.
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355       file_type
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357            all files on the system
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COMMANDS

361       semanage fcontext can also be used to manipulate default  file  context
362       mappings.
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364       semanage  permissive  can  also  be used to manipulate whether or not a
365       process type is permissive.
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367       semanage module can also be used to enable/disable/install/remove  pol‐
368       icy modules.
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370       semanage boolean can also be used to manipulate the booleans
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373       system-config-selinux is a GUI tool available to customize SELinux pol‐
374       icy settings.
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AUTHOR

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