postgresql_selinux(8) - Linux man page

Name

postgresql_selinux - Security Enhanced Linux Policy for the postgresql processes

Description

Security-Enhanced Linux secures the postgresql processes via flexible mandatory access control.

The postgresql processes execute with the postgresql_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 postgresql_t

Entrypoints

The postgresql_t SELinux type can be entered via the "postgresql_exec_t" file type. The default entrypoint paths for the postgresql_t domain are the following:"

/usr/lib(64)?/postgresql/bin/.*, /usr/lib(64)?/pgsql/test/regress/pg_regress, /usr/bin/(se)?postgres, /usr/bin/initdb(.sepgsql)?

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 postgresql policy is very flexible allowing users to setup their postgresql processes in as secure a method as possible.

The following process types are defined for postgresql:

postgresql_t

Note: semanage permissive -a postgresql_t

can be used to make the process type postgresql_t permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.

Booleans

SELinux policy is customizable based on least access required. postgresql policy is extremely flexible and has several booleans that allow you to manipulate the policy and run postgresql with the tightest access possible.

If you want to allow postgresql to use ssh and rsync for point-in-time recovery, you must turn on the postgresql_can_rsync boolean.

setsebool -P postgresql_can_rsync 1

If you want to allow users to connect to PostgreSQL, you must turn on the allow_user_postgresql_connect boolean.

setsebool -P allow_user_postgresql_connect 1

If you want to allow postgresql to use ssh and rsync for point-in-time recovery, you must turn on the postgresql_can_rsync boolean.

setsebool -P postgresql_can_rsync 1

If you want to allow users to connect to PostgreSQL, you must turn on the allow_user_postgresql_connect boolean.

setsebool -P allow_user_postgresql_connect 1

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 postgresql policy is very flexible allowing users to setup their postgresql processes in as secure a method as possible.

The following file types are defined for postgresql:

postgresql_db_t

- Set files with the postgresql_db_t type, if you want to treat the files as postgresql database content.

postgresql_etc_t

- Set files with the postgresql_etc_t type, if you want to store postgresql files in the /etc directories.

postgresql_exec_t

- Set files with the postgresql_exec_t type, if you want to transition an executable to the postgresql_t domain.

postgresql_initrc_exec_t

- Set files with the postgresql_initrc_exec_t type, if you want to transition an executable to the postgresql_initrc_t domain.

postgresql_lock_t

- Set files with the postgresql_lock_t type, if you want to treat the files as postgresql lock data, stored under the /var/lock directory

postgresql_log_t

- Set files with the postgresql_log_t type, if you want to treat the data as postgresql log data, usually stored under the /var/log directory.

postgresql_tmp_t

- Set files with the postgresql_tmp_t type, if you want to store postgresql temporary files in the /tmp directories.

postgresql_var_run_t

- Set files with the postgresql_var_run_t type, if you want to store the postgresql files under the /run directory.

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 database. You will need to use restorecon to apply the labels.

Port Types

SELinux defines port types to represent TCP and UDP ports.

You can see the types associated with a port by using the following command:

semanage port -l

Policy governs the access confined processes have to these ports. SELinux postgresql policy is very flexible allowing users to setup their postgresql processes in as secure a method as possible.

The following port types are defined for postgresql:

postgresql_port_t
Default Defined Ports:: tcp 5432

Managed Files

The SELinux process type postgresql_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.

faillog_t

/var/log/btmp.*

/var/log/faillog.*

/var/log/tallylog.*

/var/run/faillock(/.*)?

hugetlbfs_t
initrc_tmp_t
krb5_host_rcache_t

/var/cache/krb5rcache(/.*)?

/var/tmp/host_0

/var/tmp/HTTP_23

lastlog_t

/var/log/lastlog.*

mnt_t

/mnt(/[^/]*)

/mnt(/[^/]*)?

/rhev(/[^/]*)?

/media(/[^/]*)

/media(/[^/]*)?

/etc/rhgb(/.*)?

/media/.hal-.*

/net

/afs

/misc

/rhev

pcscd_var_run_t

/var/run/pcscd.events(/.*)?

/var/run/pcscd.pid

/var/run/pcscd.pub

/var/run/pcscd.comm

postgresql_db_t

/usr/lib(64)?/pgsql/test/regress(/.*)?

/var/lib/sepgsql(/.*)?

/var/lib/postgres(ql)?(/.*)?

/var/lib/pgsql/data(/.*)?

/usr/share/jonas/pgsql(/.*)?

postgresql_lock_t
postgresql_log_t

/var/log/rhdb/rhdb(/.*)?

/var/log/postgresql(/.*)?

/var/log/postgres.log.*

/var/lib/pgsql/logfile(/.*)?

/var/log/sepostgresql.log.*

/var/lib/pgsql/pgstartup.log.*

/var/lib/sepgsql/pgstartup.log.*

postgresql_tmp_t
postgresql_var_run_t

/var/run/postgresql(/.*)?

root_t

/initrd

security_t
tmp_t

/tmp

/usr/tmp

/var/tmp

/var/tmp/vi.recover

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 policy modules.

semanage port can also be used to manipulate the port definitions

semanage boolean can also be used to manipulate the booleans

system-config-selinux is a GUI tool available to customize SELinux policy settings.

Author

This manual page was auto-generated using sepolicy manpage by mgrepl.