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              1716
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148              32768-60999
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150              all ports >= 512 and < 1024
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152              all ports without defined types
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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              8955
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162              53,853
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164              all ports
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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              123
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185              all ports without defined types
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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              8955
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195              53,853
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197              all ports
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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       Disabled 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. Disabled 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.  Disabled  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 allow system to run with  NIS,  you  must  turn  on  the
268       nis_enabled boolean. Disabled by default.
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270       setsebool -P nis_enabled 1
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274       If  you  want  to  determine  whether  calling user domains can execute
275       Polipo daemon in the polipo_session_t domain,  you  must  turn  on  the
276       polipo_session_users boolean. Disabled by default.
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278       setsebool -P polipo_session_users 1
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282       If  you want to disable kernel module loading, you must turn on the se‐
283       cure_mode_insmod boolean. Disabled by default.
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285       setsebool -P secure_mode_insmod 1
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289       If you want to allow unconfined executables to make  their  stack  exe‐
290       cutable.   This  should  never, ever be necessary. Probably indicates a
291       badly coded executable, but could indicate an attack.  This  executable
292       should  be reported in bugzilla, you must turn on the selinuxuser_exec‐
293       stack boolean. Enabled by default.
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295       setsebool -P selinuxuser_execstack 1
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299       If you want to allow user to r/w files on filesystems that do not  have
300       extended  attributes  (FAT, CDROM, FLOPPY), you must turn on the selin‐
301       uxuser_rw_noexattrfile boolean. Enabled by default.
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303       setsebool -P selinuxuser_rw_noexattrfile 1
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307       If you want to allow users to run TCP servers (bind to ports and accept
308       connection  from  the  same  domain  and outside users)  disabling this
309       forces FTP passive mode and may change other protocols, you  must  turn
310       on the selinuxuser_tcp_server boolean. Disabled by default.
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312       setsebool -P selinuxuser_tcp_server 1
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316       If you want to allow users to run UDP servers (bind to ports and accept
317       connection from the same domain and outside users)  disabling this  may
318       break  avahi  discovering services on the network and other udp related
319       services, you must turn on the selinuxuser_udp_server boolean. Disabled
320       by default.
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322       setsebool -P selinuxuser_udp_server 1
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HOME_EXEC

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

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

358       The  SELinux  process  type  sysadm_t can manage files labeled with the
359       following file types.  The paths listed are the default paths for these
360       file types.  Note the processes UID still need to have DAC permissions.
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362       file_type
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364            all files on the system
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COMMANDS

368       semanage  fcontext  can also be used to manipulate default file context
369       mappings.
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371       semanage permissive can also be used to manipulate  whether  or  not  a
372       process type is permissive.
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374       semanage  module can also be used to enable/disable/install/remove pol‐
375       icy modules.
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377       semanage boolean can also be used to manipulate the booleans
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380       system-config-selinux is a GUI tool available to customize SELinux pol‐
381       icy settings.
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AUTHOR

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