NAME¶

antivirus_selinux - Security Enhanced Linux Policy for the antivirus processes

DESCRIPTION¶

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

The antivirus processes execute with the antivirus_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 antivirus_t

ENTRYPOINTS¶

The antivirus_t SELinux type can be entered via the antivirus_exec_t file type.

The default entrypoint paths for the antivirus_t domain are the following:

/usr/sbin/amavisd.*, /usr/sbin/clamd, /usr/bin/clamscan, /usr/bin/clamdscan, /usr/bin/freshclam, /usr/sbin/clamav-milter, /usr/lib/AntiVir/antivir

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

The following process types are defined for antivirus:

antivirus_t

Note: semanage permissive -a antivirus_t can be used to make the process type antivirus_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.

BOOLEANS¶

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

If you want to allow antivirus programs to read non security files on a system, you must turn on the antivirus_can_scan_system boolean. Disabled by default.

setsebool -P antivirus_can_scan_system 1

If you want to determine whether can antivirus programs use JIT compiler, you must turn on the antivirus_use_jit boolean. Disabled by default.

setsebool -P antivirus_use_jit 1

If you want to allow all daemons to write corefiles to /, you must turn on the allow_daemons_dump_core boolean. Disabled by default.

setsebool -P allow_daemons_dump_core 1

If you want to allow all daemons to use tcp wrappers, you must turn on the allow_daemons_use_tcp_wrapper boolean. Disabled by default.

setsebool -P allow_daemons_use_tcp_wrapper 1

If you want to allow all daemons the ability to read/write terminals, you must turn on the allow_daemons_use_tty boolean. Disabled by default.

setsebool -P allow_daemons_use_tty 1

If you want to allow all domains to use other domains file descriptors, you must turn on the allow_domain_fd_use boolean. Enabled by default.

setsebool -P allow_domain_fd_use 1

If you want to allow confined applications to run with kerberos, you must turn on the allow_kerberos boolean. Enabled by default.

setsebool -P allow_kerberos 1

If you want to allow sysadm to debug or ptrace all processes, you must turn on the allow_ptrace boolean. Disabled by default.

setsebool -P allow_ptrace 1

If you want to allow system to run with NIS, you must turn on the allow_ypbind boolean. Disabled by default.

setsebool -P allow_ypbind 1

If you want to enable cluster mode for daemons, you must turn on the daemons_enable_cluster_mode boolean. Disabled by default.

setsebool -P daemons_enable_cluster_mode 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

If you want to enable support for upstart as the init program, you must turn on the init_upstart boolean. Enabled by default.

setsebool -P init_upstart 1

If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default.

setsebool -P nscd_use_shm 1

MANAGED FILES¶

The SELinux process type antivirus_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.

antivirus_db_t

/var/clamav(/.*)?
/var/amavis(/.*)?
/var/lib/clamd.*
/var/lib/amavis(/.*)?
/var/lib/clamav(/.*)?
/var/virusmails(/.*)?
/var/opt/f-secure(/.*)?
/var/spool/amavisd(/.*)?

antivirus_log_t

/var/log/clamd.*
/var/log/clamav.*
/var/log/freshclam.*
/var/log/amavisd.log.*
/var/log/clamav/freshclam.*

antivirus_tmp_t

antivirus_var_run_t

/var/run/clamd.*
/var/run/clamav.*
/var/run/amavis(d)?(/.*)?
/var/run/amavis(d)?/clamd.pid
/var/run/amavisd-snmp-subagent.pid

cluster_conf_t

/etc/cluster(/.*)?

cluster_var_lib_t

/var/lib(64)?/openais(/.*)?
/var/lib(64)?/pengine(/.*)?
/var/lib(64)?/corosync(/.*)?
/usr/lib(64)?/heartbeat(/.*)?
/var/lib(64)?/heartbeat(/.*)?
/var/lib(64)?/pacemaker(/.*)?
/var/lib/cluster(/.*)?

cluster_var_run_t

/var/run/crm(/.*)?
/var/run/cman_.*
/var/run/rsctmp(/.*)?
/var/run/aisexec.*
/var/run/heartbeat(/.*)?
/var/run/cpglockd.pid
/var/run/corosync.pid
/var/run/rgmanager.pid
/var/run/cluster/rgmanager.sk

initrc_tmp_t

mnt_t

/mnt(/[^/]*)
/mnt(/[^/]*)?
/rhev(/[^/]*)?
/media(/[^/]*)
/media(/[^/]*)?
/etc/rhgb(/.*)?
/media/.hal-.*
/net
/afs
/rhev
/misc

root_t

/
/initrd

snmpd_var_lib_t

/var/agentx(/.*)?
/var/net-snmp(/.*)
/var/lib/snmp(/.*)?
/var/lib/net-snmp(/.*)?
/var/spool/snmptt(/.*)?
/usr/share/snmp/mibs/.index

tmp_t

/tmp
/usr/tmp
/var/tmp
/tmp-inst
/var/tmp-inst
/var/tmp/vi.recover

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

EQUIVALENCE DIRECTORIES

antivirus policy stores data with multiple different file context types under the /var/run/amavis(d)? directory. If you would like to store the data in a different directory you can use the semanage command to create an equivalence mapping. If you wanted to store this data under the /srv dirctory you would execute the following command:

semanage fcontext -a -e /var/run/amavis(d)? /srv/amavis(d)?
restorecon -R -v /srv/amavis(d)?

STANDARD FILE CONTEXT

SELinux defines the file context types for the antivirus, 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 antivirus_var_run_t '/srv/myantivirus_content(/.*)?'
restorecon -R -v /srv/myantivirus_content

Note: SELinux often uses regular expressions to specify labels that match multiple files.

The following file types are defined for antivirus:

antivirus_conf_t

- Set files with the antivirus_conf_t type, if you want to treat the files as antivirus configuration data, usually stored under the /etc directory.

Paths:

/etc/amavis(d)?.conf, /etc/amavisd(/.*)?

antivirus_db_t

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

Paths:

/var/clamav(/.*)?, /var/amavis(/.*)?, /var/lib/clamd.*, /var/lib/amavis(/.*)?, /var/lib/clamav(/.*)?, /var/virusmails(/.*)?, /var/opt/f-secure(/.*)?, /var/spool/amavisd(/.*)?

antivirus_exec_t

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

Paths:

/usr/sbin/amavisd.*, /usr/sbin/clamd, /usr/bin/clamscan, /usr/bin/clamdscan, /usr/bin/freshclam, /usr/sbin/clamav-milter, /usr/lib/AntiVir/antivir

antivirus_initrc_exec_t

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

Paths:

/etc/rc.d/init.d/clamd.*, /etc/rc.d/init.d/amavis, /etc/rc.d/init.d/amavisd-snmp

antivirus_log_t

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

Paths:

/var/log/clamd.*, /var/log/clamav.*, /var/log/freshclam.*, /var/log/amavisd.log.*, /var/log/clamav/freshclam.*

antivirus_tmp_t

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

antivirus_var_run_t

- Set files with the antivirus_var_run_t type, if you want to store the antivirus files under the /run or /var/run directory.

Paths:

/var/run/clamd.*, /var/run/clamav.*, /var/run/amavis(d)?(/.*)?, /var/run/amavis(d)?/clamd.pid, /var/run/amavisd-snmp-subagent.pid

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.

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 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 .

SEE ALSO¶

selinux(8), antivirus(8), semanage(8), restorecon(8), chcon(1) , setsebool(8)