tcpd_selinux(8) tcpd SELinux Policy documentation tcpd_selinux(8)NAMEtcpd_selinux - Security Enhanced Linux Policy for the tcpd processes
DESCRIPTION
Security-Enhanced Linux secures the tcpd processes via flexible manda‐
tory access control.
BOOLEANS
SELinux policy is customizable based on least access required. tcpd
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run tcpd with the tightest access possible.
If you want to allow the Telepathy connection managers to connect to
any generic TCP port, you must turn on the telepathy_tcp_con‐
nect_generic_network_ports boolean.
setsebool -P telepathy_tcp_connect_generic_network_ports 1
If you want to allow all daemons to use tcp wrappers, you must turn on
the allow_daemons_use_tcp_wrapper boolean.
setsebool -P allow_daemons_use_tcp_wrapper 1
If you want to allow users to run TCP servers (bind to ports and accept
connection from the same domain and outside users) disabling this
forces FTP passive mode and may change other protocols, you must turn
on the user_tcp_server boolean.
setsebool -P user_tcp_server 1
NSSWITCH DOMAINFILE CONTEXTS
SELinux requires files to have an extended attribute to define the file
type.
You can see the context of a file using the -Z option to ls
Policy governs the access confined processes have to these files.
SELinux tcpd policy is very flexible allowing users to setup their tcpd
processes in as secure a method as possible.
The following file types are defined for tcpd:
tcpd_exec_t
- Set files with the tcpd_exec_t type, if you want to transition an
executable to the tcpd_t domain.
tcpd_tmp_t
- Set files with the tcpd_tmp_t type, if you want to store tcpd tempo‐
rary files in the /tmp directories.
Note: File context can be temporarily modified with the chcon command.
If you want to permanantly change the file context you need to use the
semanage fcontext command. This will modify the SELinux labeling data‐
base. You will need to use restorecon to apply the labels.
PROCESS TYPES
SELinux defines process types (domains) for each process running on the
system
You can see the context of a process using the -Z option to ps
Policy governs the access confined processes have to files. SELinux
tcpd policy is very flexible allowing users to setup their tcpd pro‐
cesses in as secure a method as possible.
The following process types are defined for tcpd:
tcpd_t
Note: semanage permissive -a PROCESS_TYPE can be used to make a process
type permissive. Permissive process types are not denied access by
SELinux. AVC messages will still be generated.
COMMANDS
semanage fcontext can also be used to manipulate default file context
mappings.
semanage permissive can also be used to manipulate whether or not a
process type is permissive.
semanage module can also be used to enable/disable/install/remove pol‐
icy modules.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux pol‐
icy settings.
AUTHOR
This manual page was autogenerated by genman.py.
SEE ALSOselinux(8), tcpd(8), semanage(8), restorecon(8), chcon(1) , setse‐
bool(8)dwalsh@redhat.com tcpd tcpd_selinux(8)
