httpd_suexec_selinux(8) SELinux Policy httpd_suexec httpd_suexec_selinux(8)NAMEhttpd_suexec_selinux - Security Enhanced Linux Policy for the
httpd_suexec processes
DESCRIPTION
Security-Enhanced Linux secures the httpd_suexec processes via flexible
mandatory access control.
The httpd_suexec processes execute with the httpd_suexec_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 httpd_suexec_t
ENTRYPOINTS
The httpd_suexec_t SELinux type can be entered via the
httpd_suexec_exec_t file type.
The default entrypoint paths for the httpd_suexec_t domain are the fol‐
lowing:
/usr/lib/apache(2)?/suexec(2)?, /usr/lib/cgi-bin/(nph-)?cgiwrap(d)?,
/usr/sbin/suexec
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
httpd_suexec policy is very flexible allowing users to setup their
httpd_suexec processes in as secure a method as possible.
The following process types are defined for httpd_suexec:
httpd_suexec_t
Note: semanage permissive -a httpd_suexec_t can be used to make the
process type httpd_suexec_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.
httpd_suexec policy is extremely flexible and has several booleans that
allow you to manipulate the policy and run httpd_suexec with the tight‐
est access possible.
If you want to allow users to resolve user passwd entries directly from
ldap rather then using a sssd server, you must turn on the authlo‐
gin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 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
If you want to allow httpd to use built in scripting (usually php), you
must turn on the httpd_builtin_scripting boolean. Enabled by default.
setsebool -P httpd_builtin_scripting 1
If you want to allow HTTPD scripts and modules to connect to the net‐
work using TCP, you must turn on the httpd_can_network_connect boolean.
Disabled by default.
setsebool -P httpd_can_network_connect 1
If you want to allow HTTPD scripts and modules to connect to databases
over the network, you must turn on the httpd_can_network_connect_db
boolean. Disabled by default.
setsebool -P httpd_can_network_connect_db 1
If you want to allow http daemon to send mail, you must turn on the
httpd_can_sendmail boolean. Disabled by default.
setsebool -P httpd_can_sendmail 1
If you want to allow httpd cgi support, you must turn on the
httpd_enable_cgi boolean. Enabled by default.
setsebool -P httpd_enable_cgi 1
If you want to allow httpd to read home directories, you must turn on
the httpd_enable_homedirs boolean. Disabled by default.
setsebool -P httpd_enable_homedirs 1
If you want to allow httpd scripts and modules execmem/execstack, you
must turn on the httpd_execmem boolean. Disabled by default.
setsebool -P httpd_execmem 1
If you want to allow httpd to read user content, you must turn on the
httpd_read_user_content boolean. Disabled by default.
setsebool -P httpd_read_user_content 1
If you want to unify HTTPD to communicate with the terminal. Needed for
entering the passphrase for certificates at the terminal, you must turn
on the httpd_tty_comm boolean. Disabled by default.
setsebool -P httpd_tty_comm 1
If you want to unify HTTPD handling of all content files, you must turn
on the httpd_unified boolean. Disabled by default.
setsebool -P httpd_unified 1
If you want to allow httpd to access cifs file systems, you must turn
on the httpd_use_cifs boolean. Disabled by default.
setsebool -P httpd_use_cifs 1
If you want to allow httpd to access FUSE file systems, you must turn
on the httpd_use_fusefs boolean. Disabled by default.
setsebool -P httpd_use_fusefs 1
If you want to allow httpd to access nfs file systems, you must turn on
the httpd_use_nfs boolean. Disabled by default.
setsebool -P httpd_use_nfs 1
If you want to allow confined applications to run with kerberos, you
must turn on the kerberos_enabled boolean. Enabled by default.
setsebool -P kerberos_enabled 1
If you want to allow system to run with NIS, you must turn on the
nis_enabled boolean. Disabled by default.
setsebool -P nis_enabled 1
If you want to allow confined applications to use nscd shared memory,
you must turn on the nscd_use_shm boolean. Disabled by default.
setsebool -P nscd_use_shm 1
If you want to allow unprivileged users to execute DDL statement, you
must turn on the postgresql_selinux_users_ddl boolean. Enabled by
default.
setsebool -P postgresql_selinux_users_ddl 1
If you want to support NFS home directories, you must turn on the
use_nfs_home_dirs boolean. Disabled by default.
setsebool -P use_nfs_home_dirs 1
If you want to support SAMBA home directories, you must turn on the
use_samba_home_dirs boolean. Disabled by default.
setsebool -P use_samba_home_dirs 1
NSSWITCH DOMAIN
If you want to allow users to resolve user passwd entries directly from
ldap rather then using a sssd server for the httpd_suexec_t, you must
turn on the authlogin_nsswitch_use_ldap boolean.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow confined applications to run with kerberos for the
httpd_suexec_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
MANAGED FILES
The SELinux process type httpd_suexec_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 per‐
missions.
cifs_t
fusefs_t
/var/run/[^/]*/gvfs
httpd_suexec_tmp_t
nfs_t
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 httpd_suexec policy is very flexible allowing users to setup
their httpd_suexec processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the httpd_suexec, 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 httpd_suexec_exec_t '/srv/httpd_suexec/con‐
tent(/.*)?'
restorecon -R -v /srv/myhttpd_suexec_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
The following file types are defined for httpd_suexec:
httpd_suexec_exec_t
- Set files with the httpd_suexec_exec_t type, if you want to transi‐
tion an executable to the httpd_suexec_t domain.
Paths:
/usr/lib/apache(2)?/suexec(2)?, /usr/lib/cgi-bin/(nph-)?cgi‐
wrap(d)?, /usr/sbin/suexec
httpd_suexec_tmp_t
- Set files with the httpd_suexec_tmp_t type, if you want to store
httpd suexec temporary files in the /tmp directories.
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), httpd_suexec(8), semanage(8), restorecon(8), chcon(1),
sepolicy(8) , setsebool(8)httpd_suexec 14-05-08 httpd_suexec_selinux(8)
