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From: "Sugar, David" <dsugar@tresys.com>
To: Russell Coker <russell@coker.com.au>
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 14:16:57 +0000
Message-ID: <e2d5d98c-97c0-07b5-83d4-331c0bd89d78@tresys.com> (raw)
In-Reply-To: <1597016.RvrILB9U20@liv>



On 4/9/19 9:39 PM, Russell Coker wrote:
> Why is a socket that everything sends to labeled as kernel_t?
> 

I see, it is happening during the system booting.  /dev/log and 
/run/systemd/journal/socket are both labeled kernel_t early in the boot 
process.  At some point they are either relabeled or recreated with 
devlog_t.  But without this rule the system won't boot (I have tried).

Here are a small sample of the denials I get without these rules.

type=AVC msg=audit(1554904080.089:5018): avc:  denied  { sendto } for 
pid=7559 comm="auditd" path="/dev/log" 
scontext=system_u:system_r:auditd_t:s0 
tcontext=system_u:system_r:kernel_t:s0 tclass=unix_dgram_socket permissive=0

type=AVC msg=audit(1554904080.155:5138): avc:  denied  { sendto } for 
pid=7590 comm="systemd-cgroups" path="/run/systemd/journal/socket" 
scontext=system_u:system_r:systemd_cgroups_t:s0 
tcontext=system_u:system_r:kernel_t:s0 tclass=unix_dgram_socket permissive=0

type=AVC msg=audit(1554904080.158:5142): avc:  denied  { sendto } for 
pid=7591 comm="systemd-update-" path="/run/systemd/journal/socket" 
scontext=system_u:system_r:initrc_t:s0 
tcontext=system_u:system_r:kernel_t:s0 tclass=unix_dgram_socket permissive=0

type=AVC msg=audit(1554904467.831:181): avc:  denied  { sendto } for 
pid=7510 comm="chronyd" path="/dev/log" 
scontext=system_u:system_r:chronyd_t:s0 
tcontext=system_u:system_r:kernel_t:s0 tclass=unix_dgram_socket permissive=1

type=AVC msg=audit(1554904467.842:190): avc:  denied  { sendto } for 
pid=7498 comm="dbus-daemon" path="/dev/log" 
scontext=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 
tcontext=system_u:system_r:kernel_t:s0 tclass=unix_dgram_socket permissive=1

type=AVC msg=audit(1554904467.850:194): avc:  denied  { sendto } for 
pid=7521 comm="systemd-user-se" path="/run/systemd/journal/socket" 
scontext=system_u:system_r:systemd_sessions_t:s0 
tcontext=system_u:system_r:kernel_t:s0 tclass=unix_dgram_socket permissive=1

> 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@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
>>>>
>>>>
>>>>
>>>
> 
> 

  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
2019-04-10  1:07   ` Sugar, David
2019-04-10  1:39     ` Russell Coker
2019-04-10 14:16       ` Sugar, David [this message]
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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