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().
> >>
> >>
> >>
> >> 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
> >>
> >>
> >>
> >
--
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