[refpolicy] [PATCH] Allow systemd services to use PrivateNetwork feature

[mgrepl@redhat.com (Miroslav Grepl)]

On 01/11/2016 07:27 PM, Christopher J. PeBenito wrote:
> On 1/11/2016 1:14 PM, Nicolas Iooss wrote:
>> systemd creates a new network namespace for services which are using
>> PrivateNetwork=yes.
>>
>> In the implementation, systemd uses a socketpair as a storage buffer for
>> the namespace reference file descriptor (c.f.
>> https://github.com/systemd/systemd/blob/v228/src/core/namespace.c#L660).
>> One end of this socketpair is locked (hence the need of "lock" access to
>> self:unix_dgram_socket for init_t) while systemd opens
>> /proc/self/ns/net, which lives in nsfs.
>>
>> While at it, add filesystem_type attribute to nsfs_t.
> 
> Merged.

Lukas,
could play around and make this change also for Fedora bugs to see if it
works as expected?

Nicolas,
thank you for patches.

> 
> 
> 
>> ---
>>  policy/modules/kernel/filesystem.if | 17 +++++++++++++++++
>>  policy/modules/kernel/filesystem.te |  1 +
>>  policy/modules/system/init.te       |  3 +++
>>  3 files changed, 21 insertions(+)
>>
>> diff --git a/policy/modules/kernel/filesystem.if b/policy/modules/kernel/filesystem.if
>> index 99ad71f926b4..3455c2270942 100644
>> --- a/policy/modules/kernel/filesystem.if
>> +++ b/policy/modules/kernel/filesystem.if
>> @@ -3360,6 +3360,23 @@ interface(`fs_rw_nfsd_fs',`
>>  
>>  ########################################
>>  ## <summary>
>> +##	Read nsfs inodes (e.g. /proc/pid/ns/uts)
>> +## </summary>
>> +## <param name="domain">
>> +##	<summary>
>> +##	Domain allowed access.
>> +##	</summary>
>> +## </param>
>> +#
>> +interface(`fs_read_nsfs_files',`
>> +	gen_require(`
>> +		type nsfs_t;
>> +	')
>> +
>> +	allow $1 nsfs_t:file read_file_perms;
>> +')
>> +########################################
>> +## <summary>
>>  ##	Getattr on pstore dirs.
>>  ## </summary>
>>  ## <param name="domain">
>> diff --git a/policy/modules/kernel/filesystem.te b/policy/modules/kernel/filesystem.te
>> index 920527ca9995..ae44d92f4f10 100644
>> --- a/policy/modules/kernel/filesystem.te
>> +++ b/policy/modules/kernel/filesystem.te
>> @@ -126,6 +126,7 @@ fs_type(nfsd_fs_t)
>>  genfscon nfsd / gen_context(system_u:object_r:nfsd_fs_t,s0)
>>  
>>  type nsfs_t;
>> +fs_type(nsfs_t)
>>  genfscon nsfs / gen_context(system_u:object_r:nsfs_t,s0)
>>  
>>  type oprofilefs_t;
>> diff --git a/policy/modules/system/init.te b/policy/modules/system/init.te
>> index ea5530f55689..78031010d38c 100644
>> --- a/policy/modules/system/init.te
>> +++ b/policy/modules/system/init.te
>> @@ -199,6 +199,7 @@ ifdef(`init_systemd',`
>>  	allow init_t self:netlink_kobject_uevent_socket create_socket_perms;
>>  	allow init_t self:netlink_route_socket create_netlink_socket_perms;
>>  	allow init_t self:netlink_selinux_socket create_socket_perms;
>> +	allow init_t self:unix_dgram_socket lock;
>>  
>>  	manage_files_pattern(init_t, init_var_run_t, init_var_run_t)
>>  	manage_lnk_files_pattern(init_t, init_var_run_t, init_var_run_t)
>> @@ -260,6 +261,8 @@ ifdef(`init_systemd',`
>>  	# mount-setup
>>  	fs_unmount_autofs(init_t)
>>  	fs_getattr_pstore_dirs(init_t)
>> +	# for network namespaces
>> +	fs_read_nsfs_files(init_t)
>>  
>>  	# systemd_socket_activated policy
>>  	mls_socket_write_all_levels(init_t)
>>
> 
> 


-- 
Miroslav Grepl
Senior Software Engineer, SELinux Solutions
Red Hat, Inc.