dmesg_selinux(8) SELinux Policy dmesg dmesg_selinux(8)NAMEdmesg_selinux - Security Enhanced Linux Policy for the dmesg processes
DESCRIPTION
Security-Enhanced Linux secures the dmesg processes via flexible manda‐
tory access control.
The dmesg processes execute with the dmesg_t SELinux type. You can
check if you have these processes running by executing the ps command
with the -Z qualifier.
For example:
ps -eZ | grep dmesg_t
ENTRYPOINTS
The dmesg_t SELinux type can be entered via the dmesg_exec_t file type.
The default entrypoint paths for the dmesg_t domain are the following:
/bin/dmesg, /usr/bin/dmesg
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
dmesg policy is very flexible allowing users to setup their dmesg pro‐
cesses in as secure a method as possible.
The following process types are defined for dmesg:
dmesg_t
Note: semanage permissive -a dmesg_t can be used to make the process
type dmesg_t permissive. SELinux does not deny access to permissive
process types, but the AVC (SELinux denials) messages are still gener‐
ated.
BOOLEANS
SELinux policy is customizable based on least access required. dmesg
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run dmesg with the tightest access possible.
If you want to allow all daemons the ability to read/write terminals,
you must turn on the daemons_use_tty boolean. Disabled by default.
setsebool -P daemons_use_tty 1
If you want to deny any process from ptracing or debugging any other
processes, you must turn on the deny_ptrace boolean. Enabled by
default.
setsebool -P deny_ptrace 1
If you want to allow all domains to use other domains file descriptors,
you must turn on the domain_fd_use boolean. Enabled by default.
setsebool -P domain_fd_use 1
If you want to allow all domains to have the kernel load modules, you
must turn on the domain_kernel_load_modules boolean. Disabled by
default.
setsebool -P domain_kernel_load_modules 1
If you want to allow all domains to execute in fips_mode, you must turn
on the fips_mode boolean. Enabled by default.
setsebool -P fips_mode 1
If you want to enable reading of urandom for all domains, you must turn
on the global_ssp boolean. Disabled by default.
setsebool -P global_ssp 1
MANAGED FILES
The SELinux process type dmesg_t can manage files labeled with the fol‐
lowing file types. The paths listed are the default paths for these
file types. Note the processes UID still need to have DAC permissions.
var_log_t
/var/log/.*
/nsr/logs(/.*)?
/var/webmin(/.*)?
/var/log/secure[^/]*
/opt/zimbra/log(/.*)?
/var/log/maillog[^/]*
/var/log/spooler[^/]*
/var/log/messages[^/]*
/usr/centreon/log(/.*)?
/var/spool/rsyslog(/.*)?
/var/axfrdns/log/main(/.*)?
/var/spool/bacula/log(/.*)?
/var/tinydns/log/main(/.*)?
/var/dnscache/log/main(/.*)?
/var/stockmaniac/templates_cache(/.*)?
/opt/Symantec/scspagent/IDS/system(/.*)?
/var/log
/var/log/dmesg
/var/log/syslog
/var/named/chroot/var/log
FILE 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 dmesg policy is very flexible allowing users to setup their
dmesg processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the dmesg, if you wanted to
store files with these types in a diffent paths, you need to execute
the semanage command to sepecify alternate labeling and then use
restorecon to put the labels on disk.
semanage fcontext -a -t dmesg_exec_t '/srv/dmesg/content(/.*)?'
restorecon -R -v /srv/mydmesg_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
The following file types are defined for dmesg:
dmesg_exec_t
- Set files with the dmesg_exec_t type, if you want to transition an
executable to the dmesg_t domain.
Paths:
/bin/dmesg, /usr/bin/dmesg
Note: File context can be temporarily modified with the chcon command.
If you want to permanently 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.
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 auto-generated using sepolicy manpage .
SEE ALSOselinux(8), dmesg(8), semanage(8), restorecon(8), chcon(1), sepolicy(8)
, setsebool(8)dmesg 13-11-20 dmesg_selinux(8)
