Re: [PATCH] Add kernel_dgram_send() into logging_send_syslog_msg()

[Chris PeBenito <pebenito@xxxxxxxx>]

On 4/9/19 9:39 PM, Russell Coker wrote:
> Why is a socket that everything sends to labeled as kernel_t?
>
> On Wednesday, 10 April 2019 11:07:29 AM AEST Sugar, David wrote:
> > On 4/9/19 9:00 PM, Russell Coker wrote:
> >
> > > Why does the kernel need such access?
> >
> >
> > I'm not sure I understand your question.  Are you asking why the
> > kernel_dgram_send() access is needed by syslog?  This is because many
> > domains send messages to the journal.
> >
> > I have been adding this interface as needed throughout the policy as I'm
> > seeing issues.  It was suggested to move this interface use into
> > logging_send_syslog_msg as that is the same concept and most domains log
> > already.
> >
> > This patch is mostly removing uses of kernel_dgram_send and just adding
> > it one place.
> >
> >
> > > On Wednesday, 10 April 2019 1:09:59 AM AEST Sugar, David wrote:
> > >
> > > > This patch is based on comments from previous a patch to
> > > > remove the many uses of kernel_dgram_send() and incorporate
> > > > it into logging_send_syslog_msg().


Russell, you aren't seeing this type of access on Debian?

How about Gentoo?  If this is Fedora/RHEL-specific, then it should be 
reflected in the policy accordingly.






> > > > Signed-off-by: Dave Sugar <dsugar@xxxxxxxxxx>
> > > > ---
> > > >
> > > >    policy/modules/admin/aide.te       | 1 -
> > > >    policy/modules/admin/usermanage.te | 5 -----
> > > >    policy/modules/services/dbus.te    | 3 ---
> > > >    policy/modules/system/authlogin.te | 5 -----
> > > >    policy/modules/system/init.if      | 2 --
> > > >    policy/modules/system/init.te      | 3 ---
> > > >    policy/modules/system/logging.if   | 2 ++
> > > >    policy/modules/system/logging.te   | 4 ----
> > > >    policy/modules/system/systemd.te   | 5 -----
> > > >    policy/modules/system/udev.te      | 1 -
> > > >    10 files changed, 2 insertions(+), 29 deletions(-)
> > > >
> > > >
> > > >
> > > > diff --git a/policy/modules/admin/aide.te b/policy/modules/admin/aide.te
> > > > index 30deba09..f5e64a86 100644
> > > > --- a/policy/modules/admin/aide.te
> > > > +++ b/policy/modules/admin/aide.te
> > > > @@ -44,7 +44,6 @@ logging_log_filetrans(aide_t, aide_log_t, file)
> > > >
> > > >    files_read_all_files(aide_t)
> > > >    files_read_all_symlinks(aide_t)
> > > >    
> > > >
> > > > -kernel_dgram_send(aide_t)
> > > >
> > > >    kernel_read_crypto_sysctls(aide_t)
> > > >    
> > > >    logging_send_audit_msgs(aide_t)
> > > >
> > > > diff --git a/policy/modules/admin/usermanage.te
> > > > b/policy/modules/admin/usermanage.te
> > >    index 5753741b..4a10bf84 100644
> > > > --- a/policy/modules/admin/usermanage.te
> > > > +++ b/policy/modules/admin/usermanage.te
> > > > @@ -366,11 +366,6 @@ userdom_read_user_tmp_files(passwd_t)
> > > >
> > > >    # on user home dir
> > > >    userdom_dontaudit_search_user_home_content(passwd_t)
> > > >    
> > > >
> > > > -ifdef(`init_systemd',`
> > > > -	# for journald /dev/log
> > > > -	kernel_dgram_send(passwd_t)
> > > > -')
> > > > -
> > > >
> > > >    optional_policy(`
> > > >    
> > > >    	nscd_run(passwd_t, passwd_roles)
> > > >    
> > > >    ')
> > > >
> > > > diff --git a/policy/modules/services/dbus.te
> > > > b/policy/modules/services/dbus.te
> > >    index 9c085876..c05370dd 100644
> > > > --- a/policy/modules/services/dbus.te
> > > > +++ b/policy/modules/services/dbus.te
> > > > @@ -162,9 +162,6 @@ ifdef(`init_systemd', `
> > > >
> > > >    	# for /run/systemd/dynamic-uid/
> > > >    	init_list_pids(system_dbusd_t)
> > > >    	init_read_runtime_symlinks(system_dbusd_t)
> > > >
> > > > -
> > > > -	# for journald /dev/log
> > > > -	kernel_dgram_send(system_dbusd_t)
> > > >
> > > >    ')
> > > >    
> > > >    optional_policy(`
> > > >
> > > > diff --git a/policy/modules/system/authlogin.te
> > > > b/policy/modules/system/authlogin.te
> > >    index 28f74bac..2cf86952 100644
> > > > --- a/policy/modules/system/authlogin.te
> > > > +++ b/policy/modules/system/authlogin.te
> > > > @@ -144,11 +144,6 @@ ifdef(`distro_ubuntu',`
> > > >
> > > >    	')
> > > >    
> > > >    ')
> > > >    
> > > >
> > > > -ifdef(`init_systemd',`
> > > > -	# for journald /dev/log
> > > > -	kernel_dgram_send(chkpwd_t)
> > > > -')
> > > > -
> > > >
> > > >    optional_policy(`
> > > >    
> > > >    	# apache leaks file descriptors
> > > >    	apache_dontaudit_rw_tcp_sockets(chkpwd_t)
> > > >
> > > > diff --git a/policy/modules/system/init.if
> > > > b/policy/modules/system/init.if
> > > > index fef2c88e..00bd4991 100644
> > > > --- a/policy/modules/system/init.if
> > > > +++ b/policy/modules/system/init.if
> > > > @@ -306,8 +306,6 @@ interface(`init_daemon_domain',`
> > > >
> > > >    
> > > >    
> > > >    	ifdef(`init_systemd',`
> > > >    	
> > > >    		init_domain($1, $2)
> > > >
> > > > -		# this may be because of late labelling
> > > > -		kernel_dgram_send($1)
> > > >
> > > >    
> > > >    
> > > >    		allow $1 init_t:unix_dgram_socket sendto;
> > > >    	
> > > >    	')
> > > >
> > > > diff --git a/policy/modules/system/init.te
> > > > b/policy/modules/system/init.te
> > > > index a12d151b..3e8eb2da 100644
> > > > --- a/policy/modules/system/init.te
> > > > +++ b/policy/modules/system/init.te
> > > > @@ -272,7 +272,6 @@ ifdef(`init_systemd',`
> > > >
> > > >    
> > > >    
> > > >    	kernel_dyntrans_to(init_t)
> > > >    	kernel_read_network_state(init_t)
> > > >
> > > > -	kernel_dgram_send(init_t)
> > > >
> > > >    	kernel_stream_connect(init_t)
> > > >    	kernel_getattr_proc(init_t)
> > > >    	kernel_read_fs_sysctls(init_t)
> > > >
> > > > @@ -969,8 +968,6 @@ ifdef(`init_systemd',`
> > > >
> > > >    	allow initrc_t systemdunit:service reload;
> > > >    	allow initrc_t init_script_file_type:service { stop start status
> > > >    	reload
> > > >
> > > > };
> > >    
> > > > -	kernel_dgram_send(initrc_t)
> > > > -
> > > >
> > > >    	# run systemd misc initializations
> > > >    	# in the initrc_t domain, as would be
> > > >    	# done in traditional sysvinit/upstart.
> > > >
> > > > diff --git a/policy/modules/system/logging.if
> > > > b/policy/modules/system/logging.if
> > >    index 7b7644f7..1f696b7f 100644
> > > > --- a/policy/modules/system/logging.if
> > > > +++ b/policy/modules/system/logging.if
> > > > @@ -642,6 +642,8 @@ interface(`logging_send_syslog_msg',`
> > > >
> > > >    	ifdef(`init_systemd',`
> > > >    	
> > > >    		# Allow systemd-journald to check whether the process died
> > > >    		allow syslogd_t $1:process signull;
> > > >
> > > > +
> > > > +		kernel_dgram_send($1)
> > > >
> > > >    	')
> > > >    
> > > >    ')
> > > >    
> > > >
> > > > diff --git a/policy/modules/system/logging.te
> > > > b/policy/modules/system/logging.te
> > >    index 0c5be1cd..02f268ea 100644
> > > > --- a/policy/modules/system/logging.te
> > > > +++ b/policy/modules/system/logging.te
> > > > @@ -271,10 +271,6 @@ miscfiles_read_localization(audisp_t)
> > > >
> > > >    
> > > >    sysnet_dns_name_resolve(audisp_t)
> > > >    
> > > >
> > > > -ifdef(`init_systemd',`
> > > > -	kernel_dgram_send(audisp_t)
> > > > -')
> > > > -
> > > >
> > > >    optional_policy(`
> > > >    
> > > >    	dbus_system_bus_client(audisp_t)
> > > >    
> > > >    ')
> > > >
> > > > diff --git a/policy/modules/system/systemd.te
> > > > b/policy/modules/system/systemd.te
> > >    index f6455f6f..cf9241c0 100644
> > > > --- a/policy/modules/system/systemd.te
> > > > +++ b/policy/modules/system/systemd.te
> > > > @@ -266,7 +266,6 @@
> > > > systemd_log_parse_environment(systemd_gpt_generator_t)
> > > >
> > > >    allow systemd_cgroups_t self:capability net_admin;
> > > >    
> > > >    kernel_domtrans_to(systemd_cgroups_t, systemd_cgroups_exec_t)
> > > >
> > > > -kernel_dgram_send(systemd_cgroups_t)
> > > >
> > > >    # for /proc/cmdline
> > > >    kernel_read_system_state(systemd_cgroups_t)
> > > >    
> > > >
> > > > @@ -642,7 +641,6 @@ manage_dirs_pattern(systemd_networkd_t,
> > > > systemd_networkd_var_run_t, systemd_netw
> > > > manage_files_pattern(systemd_networkd_t, systemd_networkd_var_run_t,
> > > > systemd_networkd_var_run_t) manage_lnk_files_pattern(systemd_networkd_t,
> > > > systemd_networkd_var_run_t, systemd_networkd_var_run_t)
> > > > -kernel_dgram_send(systemd_networkd_t)
> > > >
> > > >    kernel_read_system_state(systemd_networkd_t)
> > > >    kernel_read_kernel_sysctls(systemd_networkd_t)
> > > >    kernel_read_network_state(systemd_networkd_t)
> > > >
> > > > @@ -667,8 +665,6 @@ auth_use_nsswitch(systemd_networkd_t)
> > > >
> > > >    init_dgram_send(systemd_networkd_t)
> > > >    init_read_state(systemd_networkd_t)
> > > >    
> > > >
> > > > -logging_send_syslog_msg(systemd_networkd_t)
> > > > -
> > > >
> > > >    miscfiles_read_localization(systemd_networkd_t)
> > > >    
> > > >    sysnet_read_config(systemd_networkd_t)
> > > >
> > > > @@ -945,7 +941,6 @@ init_pid_filetrans(systemd_resolved_t,
> > > > systemd_resolved_var_run_t, dir)
> > >    
> > >    
> > > >    dev_read_sysfs(systemd_resolved_t)
> > > >    
> > > >
> > > > -kernel_dgram_send(systemd_resolved_t)
> > > >
> > > >    kernel_read_crypto_sysctls(systemd_resolved_t)
> > > >    kernel_read_kernel_sysctls(systemd_resolved_t)
> > > >    kernel_read_net_sysctls(systemd_resolved_t)
> > > >
> > > > diff --git a/policy/modules/system/udev.te
> > > > b/policy/modules/system/udev.te
> > > > index ff564280..f00de30d 100644
> > > > --- a/policy/modules/system/udev.te
> > > > +++ b/policy/modules/system/udev.te
> > > > @@ -99,7 +99,6 @@ kernel_read_modprobe_sysctls(udev_t)
> > > >
> > > >    kernel_read_kernel_sysctls(udev_t)
> > > >    kernel_rw_hotplug_sysctls(udev_t)
> > > >    kernel_rw_unix_dgram_sockets(udev_t)
> > > >
> > > > -kernel_dgram_send(udev_t)
> > > >
> > > >    kernel_signal(udev_t)
> > > >    kernel_search_debugfs(udev_t)
> > > >    kernel_search_key(udev_t)
> > > >
> > > > --
> > > > 2.20.1


--
Chris PeBenito