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From: Russell Coker <russell@coker.com.au>
To: "Sugar, David" <dsugar@tresys.com>
Cc: "selinux-refpolicy@vger.kernel.org"  <selinux-refpolicy@vger.kernel.org>
Subject: Re: [PATCH] Add kernel_dgram_send() into logging_send_syslog_msg()
Date: Wed, 10 Apr 2019 11:00:32 +1000
Message-ID: <2392740.Zyo9vk4oGf@liv> (raw)
In-Reply-To: <20190409150948.10882-1-dsugar@tresys.com>

Why does the kernel need such access?

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@tresys.com>
> ---
>  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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  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-09 15:09 Sugar, David
2019-04-10  1:00 ` Russell Coker [this message]
2019-04-10  1:07   ` Sugar, David
2019-04-10  1:39     ` Russell Coker
2019-04-10 14:16       ` Sugar, David
2019-04-12 11:54       ` Chris PeBenito
2019-04-13  5:35         ` Russell Coker
2019-04-13 15:36           ` Sugar, David
2019-04-13 15:40             ` Russell Coker

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