Re: [PATCH v2] Setup attribute for fixed_disk_device and removable_device

["Sugar, David" <dsugar@tresys.com>]

On 3/14/19 6:06 PM, Chris PeBenito wrote:
> On 3/13/19 2:18 PM, Sugar, David wrote:
>> I am having trouble with some denials due to the fact I am setting
>> up specific private types for media attached to my system.  This
>> changes to use an attribute for media and interfaces to add types
>> to the newly created attribute
> 
> What you implemented doesn't seem consistent with what you have in the 
> commit message.  sr0 is in your example denials, so these aren't all 
> fixed disk devices, so the interface names and the attribute names 
> should be related to all storage devices, it would seem.
> 
> 

No, they are not all fixed disk denials.  And maybe I should have split 
this into 2 (or 3) patches.  As I was making changes they all seemed 
related from my use case, but from your point of view I can see why they 
are probably different.  And I may not be explaining what I'm trying to 
accomplish clearly.

Basically I have two (or three) cases:
1) I want to provide distinct types for USB devices so that only certain 
domains are able to mount/umount/format/etc...  The attribute provides a 
way to grant access to things like lvm_t and kernel_t which still need 
to do stuff with the device nodes.  The USB devices /dev/sd* by default 
are labeled fixed_disk_device_t.

2) I want to provide distinct types for certain hard disk/LVM 
partitions.  This will provide a way to restrict access to certain 
domains to alter those hard disk partitions (i.e. mount and umount and 
cryptsetup (to change LUKS password)).  At the same time this restricts 
those domains that need this specific hard disk access to still not have 
access to other partitions labeled fixed_disk_device_t.  i.e. so if this 
domain is compromised, it can only alter the single partition it has 
access to, not others.

3) The last case maybe overkill (maybe not) where I am labeling /dev/sr0 
and /dev/sg1 with a separate type to better control access to write to 
the generic scsi device node to only the process who is writing optical 
media.  Again this provides a way to restrict access to the other 
/dev/sg* devices this process should not be accessing.  /dev/sr0 is 
removable_device_t by default but I also have some USB devices that 
present as cdrom devices get /dev/sr1 as the device node and by default 
are also labeled removable_device_t.

I am able to use specific udev rules to correctly setup the SELinux 
labels for these specific hard disk partitions, USB devices and optical 
drive.

I am also open to other recommendations for a better way to solve these 
denials without giving domains that only need to access a single device 
or partition access to all devices.

While I wait for any thoughts I will split this into three separate 
patches and try to get better examples of the kinds of denials I'm 
seeing for each.

>> Updates based on feedback to create 'all' interfaces rather than
>> updating existing interfaces.
>>
>> I'm trying to resolve issues with denials like the following:
>> type=AVC msg=audit(1551461957.121:9050): avc:  denied  { open } for  
>> pid=30877 comm="cryptsetup" path="/dev/sdb" dev="devtmpfs" ino=110450 
>> scontext=system_u:system_r:lvm_t:s0-s0:c0.c1023 
>> tcontext=system_u:object_r:private_device_t:s0 tclass=blk_file 
>> permissive=1
>> type=AVC msg=audit(1551461957.121:9051): avc:  denied  { ioctl } for  
>> pid=30877 comm="cryptsetup" path="/dev/sdb" dev="devtmpfs" ino=110450 
>> ioctlcmd=1268 scontext=system_u:system_r:lvm_t:s0-s0:c0.c1023 
>> tcontext=system_u:object_r:private_device_t:s0 tclass=blk_file 
>> permissive=1
>> type=AVC msg=audit(1551461973.149:9101): avc:  denied  { getattr } 
>> for  pid=28 comm="kdevtmpfs" path="/sdb1" dev="devtmpfs" ino=110461 
>> scontext=system_u:system_r:kernel_t:s0 
>> tcontext=system_u:object_r:private_device_t:s0 tclass=blk_file 
>> permissive=1
>> type=AVC msg=audit(1551461973.149:9102): avc:  denied  { setattr } 
>> for  pid=28 comm="kdevtmpfs" name="sdb1" dev="devtmpfs" ino=110461 
>> scontext=system_u:system_r:kernel_t:s0 
>> tcontext=system_u:object_r:private_device_t:s0 tclass=blk_file 
>> permissive=1
>> type=AVC msg=audit(1551461973.149:9103): avc:  denied  { unlink } for  
>> pid=28 comm="kdevtmpfs" name="sdb1" dev="devtmpfs" ino=110461 
>> scontext=system_u:system_r:kernel_t:s0 
>> tcontext=system_u:object_r:private_device_t:s0 tclass=blk_file 
>> permissive=1
>>
>> type=AVC msg=audit(1552228893.128:472): avc:  denied  { getattr } for  
>> pid=8141 comm="systemd-logind" name="sg1" dev="devtmpfs" ino=31873 
>> scontext=system_u:system_r:systemd_logind_t:s0 
>> tcontext=system_u:object_r:private_device_t:s0 tclass=chr_file 
>> permissive=1
>> type=AVC msg=audit(1552228893.128:473): avc:  denied  { setattr } for  
>> pid=8141 comm="systemd-logind" name="sg1" dev="devtmpfs" ino=31873 
>> scontext=system_u:system_r:systemd_logind_t:s0 
>> tcontext=system_u:object_r:private_device_t:s0 tclass=chr_file 
>> permissive=1
>> type=AVC msg=audit(1552228893.128:474): avc:  denied  { getattr } for  
>> pid=8141 comm="systemd-logind" name="sr0" dev="devtmpfs" ino=14570 
>> scontext=system_u:system_r:systemd_logind_t:s0 
>> tcontext=system_u:object_r:private_device_t:s0 tclass=blk_file 
>> permissive=1
>> type=AVC msg=audit(1552228893.128:475): avc:  denied  { setattr } for  
>> pid=8141 comm="systemd-logind" name="sr0" dev="devtmpfs" ino=14570 
>> scontext=system_u:system_r:systemd_logind_t:s0 
>> tcontext=system_u:object_r:private_device_t:s0 tclass=blk_file 
>> permissive=1
>>
>> Signed-off-by: Dave Sugar <dsugar@tresys.com>
>> ---
>>   policy/modules/kernel/kernel.te  |   7 +-
>>   policy/modules/kernel/storage.if | 320 +++++++++++++++++++++++++++++++
>>   policy/modules/kernel/storage.te |   7 +
>>   policy/modules/system/lvm.te     |   2 +-
>>   policy/modules/system/systemd.te |   8 +-
>>   5 files changed, 336 insertions(+), 8 deletions(-)
>>
>> diff --git a/policy/modules/kernel/kernel.te 
>> b/policy/modules/kernel/kernel.te
>> index e971c533..acc8a88c 100644
>> --- a/policy/modules/kernel/kernel.te
>> +++ b/policy/modules/kernel/kernel.te
>> @@ -352,9 +352,10 @@ ifdef(`init_systemd',`
>>       optional_policy(`
>>           storage_dev_filetrans_fixed_disk(kernel_t)
>> -        storage_setattr_fixed_disk_dev(kernel_t)
>> -        storage_create_fixed_disk_dev(kernel_t)
>> -        storage_delete_fixed_disk_dev(kernel_t)
>> +        storage_getattr_all_scsi_generic_dev(kernel_t)
>> +        storage_setattr_all_fixed_disk_dev(kernel_t)
>> +        storage_create_all_fixed_disk_dev(kernel_t)
>> +        storage_delete_all_fixed_disk_dev(kernel_t)
>>       ')
>>   ')
>> diff --git a/policy/modules/kernel/storage.if 
>> b/policy/modules/kernel/storage.if
>> index 0292eee4..93208835 100644
>> --- a/policy/modules/kernel/storage.if
>> +++ b/policy/modules/kernel/storage.if
>> @@ -1,5 +1,25 @@
>>   ## <summary>Policy controlling access to storage devices</summary>
>> +########################################
>> +## <summary>
>> +##    Allow the caller to get the attributes of
>> +##    all fixed disk device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain allowed access.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_getattr_all_fixed_disk_dev',`
>> +    gen_require(`
>> +        attribute fixed_disk_device;
>> +    ')
>> +
>> +    dev_list_all_dev_nodes($1)
>> +    allow $1 fixed_disk_device:blk_file getattr;
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Allow the caller to get the attributes of fixed disk
>> @@ -20,6 +40,26 @@ interface(`storage_getattr_fixed_disk_dev',`
>>       allow $1 fixed_disk_device_t:blk_file getattr;
>>   ')
>> +########################################
>> +## <summary>
>> +##    Do not audit attempts made by the caller to get
>> +##    the attributes of all fixed disk device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain to not audit.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_dontaudit_all_getattr_fixed_disk_dev',`
>> +    gen_require(`
>> +        attribute fixed_disk_device;
>> +    ')
>> +
>> +    dontaudit $1 fixed_disk_device:blk_file getattr;
>> +    dontaudit $1 fixed_disk_device:chr_file getattr; # /dev/rawctl
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Do not audit attempts made by the caller to get
>> @@ -40,6 +80,26 @@ interface(`storage_dontaudit_getattr_fixed_disk_dev',`
>>       dontaudit $1 fixed_disk_device_t:chr_file getattr; # /dev/rawctl
>>   ')
>> +########################################
>> +## <summary>
>> +##    Allow the caller to set the attributes of all
>> +##    fixed disk device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain allowed access.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_setattr_all_fixed_disk_dev',`
>> +    gen_require(`
>> +        attribute fixed_disk_device;
>> +    ')
>> +
>> +    dev_list_all_dev_nodes($1)
>> +    allow $1 fixed_disk_device:blk_file setattr;
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Allow the caller to set the attributes of fixed disk
>> @@ -79,6 +139,31 @@ 
>> interface(`storage_dontaudit_setattr_fixed_disk_dev',`
>>       dontaudit $1 fixed_disk_device_t:blk_file setattr;
>>   ')
>> +########################################
>> +## <summary>
>> +##    Allow the caller to directly read from all fixed disks.
>> +##    This is extremely dangerous as it can bypass the
>> +##    SELinux protections for filesystem objects, and
>> +##    should only be used by trusted domains.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain allowed access.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_raw_read_all_fixed_disk',`
>> +    gen_require(`
>> +        attribute fixed_disk_raw_read;
>> +        attribute fixed_disk_device;
>> +    ')
>> +
>> +    dev_list_all_dev_nodes($1)
>> +    allow $1 fixed_disk_device:blk_file read_blk_file_perms;
>> +    allow $1 fixed_disk_device:chr_file read_chr_file_perms;
>> +    typeattribute $1 fixed_disk_raw_read;
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Allow the caller to directly read from a fixed disk.
>> @@ -188,6 +273,26 @@ interface(`storage_raw_rw_fixed_disk',`
>>       storage_raw_write_fixed_disk($1)
>>   ')
>> +########################################
>> +## <summary>
>> +##    Allow the caller to create all fixed disk device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain allowed access.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_create_all_fixed_disk_dev',`
>> +    gen_require(`
>> +        attribute fixed_disk_device;
>> +    ')
>> +
>> +    allow $1 self:capability mknod;
>> +    allow $1 fixed_disk_device:blk_file create_blk_file_perms;
>> +    dev_add_entry_generic_dirs($1)
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Allow the caller to create fixed disk device nodes.
>> @@ -208,6 +313,25 @@ interface(`storage_create_fixed_disk_dev',`
>>       dev_add_entry_generic_dirs($1)
>>   ')
>> +########################################
>> +## <summary>
>> +##    Allow the caller to delete all fixed disk device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain allowed access.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_delete_all_fixed_disk_dev',`
>> +    gen_require(`
>> +        attribute fixed_disk_device;
>> +    ')
>> +
>> +    allow $1 fixed_disk_device:blk_file delete_blk_file_perms;
>> +    dev_remove_entry_generic_dirs($1)
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Allow the caller to delete fixed disk device nodes.
>> @@ -227,6 +351,29 @@ interface(`storage_delete_fixed_disk_dev',`
>>       dev_remove_entry_generic_dirs($1)
>>   ')
>> +########################################
>> +## <summary>
>> +##    Create, read, write, and delete fixed disk device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain allowed access.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_manage_all_fixed_disk',`
>> +    gen_require(`
>> +        attribute fixed_disk_raw_read, fixed_disk_raw_write;
>> +        attribute fixed_disk_device;
>> +    ')
>> +
>> +    dev_list_all_dev_nodes($1)
>> +    allow $1 self:capability mknod;
>> +    allow $1 fixed_disk_device:blk_file manage_blk_file_perms;
>> +    allow $1 fixed_disk_device:chr_file manage_chr_file_perms;
>> +    typeattribute $1 fixed_disk_raw_read, fixed_disk_raw_write;
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Create, read, write, and delete fixed disk device nodes.
>> @@ -293,6 +440,25 @@ interface(`storage_tmpfs_filetrans_fixed_disk',`
>>       fs_tmpfs_filetrans($1, fixed_disk_device_t, blk_file)
>>   ')
>> +########################################
>> +## <summary>
>> +##    Relabel all fixed disk device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain allowed access.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_relabel_all_fixed_disk',`
>> +    gen_require(`
>> +        attribute fixed_disk_device;
>> +    ')
>> +
>> +    dev_list_all_dev_nodes($1)
>> +    allow $1 fixed_disk_device:blk_file relabel_blk_file_perms;
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Relabel fixed disk device nodes.
>> @@ -388,6 +554,26 @@ interface(`storage_dontaudit_rw_fuse',`
>>       dontaudit $1 fuse_device_t:chr_file rw_file_perms;
>>   ')
>> +########################################
>> +## <summary>
>> +##    Allow the caller to get the attributes of
>> +##    all generic SCSI interface device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain allowed access.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_getattr_all_scsi_generic_dev',`
>> +    gen_require(`
>> +        attribute scsi_generic_device;
>> +    ')
>> +
>> +    dev_list_all_dev_nodes($1)
>> +    allow $1 scsi_generic_device:chr_file getattr;
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Allow the caller to get the attributes of
>> @@ -408,6 +594,26 @@ interface(`storage_getattr_scsi_generic_dev',`
>>       allow $1 scsi_generic_device_t:chr_file getattr;
>>   ')
>> +########################################
>> +## <summary>
>> +##    Allow the caller to set the attributes of
>> +##    all generic SCSI interface device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain allowed access.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_setattr_all_scsi_generic_dev',`
>> +    gen_require(`
>> +        attribute scsi_generic_device;
>> +    ')
>> +
>> +    dev_list_all_dev_nodes($1)
>> +    allow $1 scsi_generic_device:chr_file setattr;
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Allow the caller to set the attributes of
>> @@ -517,6 +723,26 @@ interface(`storage_dontaudit_rw_scsi_generic',`
>>       dontaudit $1 scsi_generic_device_t:chr_file rw_file_perms;
>>   ')
>> +########################################
>> +## <summary>
>> +##    Allow the caller to get the attributes of all removable
>> +##    devices device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain allowed access.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_getattr_all_removable_dev',`
>> +    gen_require(`
>> +        attribute removable_device;
>> +    ')
>> +
>> +    dev_list_all_dev_nodes($1)
>> +    allow $1 removable_device:blk_file getattr;
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Allow the caller to get the attributes of removable
>> @@ -556,6 +782,25 @@ 
>> interface(`storage_dontaudit_getattr_removable_dev',`
>>       dontaudit $1 removable_device_t:blk_file getattr;
>>   ')
>> +########################################
>> +## <summary>
>> +##    Do not audit attempts made by the caller to get
>> +##    the attributes of all removable devices device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain to not audit.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_dontaudit_getattr_all_removable_dev',`
>> +    gen_require(`
>> +        attribute removable_device;
>> +    ')
>> +
>> +    dontaudit $1 removable_device:blk_file getattr;
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Do not audit attempts made by the caller to read
>> @@ -595,6 +840,26 @@ 
>> interface(`storage_dontaudit_write_removable_device',`
>>       dontaudit $1 removable_device_t:blk_file write_blk_file_perms;
>>   ')
>> +########################################
>> +## <summary>
>> +##    Allow the caller to set the attributes of all removable
>> +##    devices device nodes.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Domain allowed access.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_setattr_all_removable_dev',`
>> +    gen_require(`
>> +        attribute removable_device;
>> +    ')
>> +
>> +    dev_list_all_dev_nodes($1)
>> +    allow $1 removable_device:blk_file setattr;
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Allow the caller to set the attributes of removable
>> @@ -796,6 +1061,61 @@ interface(`storage_setattr_tape_dev',`
>>       allow $1 tape_device_t:chr_file setattr;
>>   ')
>> +########################################
>> +## <summary>
>> +##    Mark a type as a fixed disk device type.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Type to associate
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_fixed_disk_device_type',`
>> +    gen_require(`
>> +        attribute fixed_disk_device;
>> +    ')
>> +
>> +    typeattribute $1 fixed_disk_device;
>> +')
>> +
>> +########################################
>> +## <summary>
>> +##    Mark a type as a removable device type.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Type to associate.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_removable_device_type',`
>> +    gen_require(`
>> +        attribute removable_device;
>> +    ')
>> +
>> +    typeattribute $1 removable_device;
>> +')
>> +
>> +
>> +########################################
>> +## <summary>
>> +##    Mark a type as a scsi generic device type.
>> +## </summary>
>> +## <param name="domain">
>> +##    <summary>
>> +##    Type to associate.
>> +##    </summary>
>> +## </param>
>> +#
>> +interface(`storage_scsi_generic_device_type',`
>> +    gen_require(`
>> +        attribute scsi_generic_device;
>> +    ')
>> +
>> +    typeattribute $1 scsi_generic_device;
>> +')
>> +
>>   ########################################
>>   ## <summary>
>>   ##    Unconfined access to storage devices.
>> diff --git a/policy/modules/kernel/storage.te 
>> b/policy/modules/kernel/storage.te
>> index c10290c0..cc59380d 100644
>> --- a/policy/modules/kernel/storage.te
>> +++ b/policy/modules/kernel/storage.te
>> @@ -11,12 +11,17 @@ attribute scsi_generic_read;
>>   attribute scsi_generic_write;
>>   attribute storage_unconfined_type;
>> +attribute fixed_disk_device;
>> +attribute removable_device;
>> +attribute scsi_generic_device;
>> +
>>   #
>>   # fixed_disk_device_t is the type of
>>   # /dev/hd* and /dev/sd*.
>>   #
>>   type fixed_disk_device_t;
>>   dev_node(fixed_disk_device_t)
>> +storage_fixed_disk_device_type(fixed_disk_device_t)
>>   neverallow ~{ fixed_disk_raw_read storage_unconfined_type } 
>> fixed_disk_device_t:{ chr_file blk_file } read;
>>   neverallow ~{ fixed_disk_raw_write storage_unconfined_type } 
>> fixed_disk_device_t:{ chr_file blk_file } { append write };
>> @@ -33,6 +38,7 @@ dev_node(fuse_device_t)
>>   #
>>   type scsi_generic_device_t;
>>   dev_node(scsi_generic_device_t)
>> +storage_scsi_generic_device_type(scsi_generic_device_t)
>>   neverallow ~{ scsi_generic_read storage_unconfined_type } 
>> scsi_generic_device_t:{ chr_file blk_file } read;
>>   neverallow ~{ scsi_generic_write storage_unconfined_type } 
>> scsi_generic_device_t:{ chr_file blk_file } { append write };
>> @@ -43,6 +49,7 @@ neverallow ~{ scsi_generic_write 
>> storage_unconfined_type } scsi_generic_device_t
>>   #
>>   type removable_device_t;
>>   dev_node(removable_device_t)
>> +storage_removable_device_type(removable_device_t)
>>   #
>>   # tape_device_t is the type of
>> diff --git a/policy/modules/system/lvm.te b/policy/modules/system/lvm.te
>> index ba64c39d..0bb7177c 100644
>> --- a/policy/modules/system/lvm.te
>> +++ b/policy/modules/system/lvm.te
>> @@ -300,7 +300,7 @@ storage_dontaudit_read_removable_device(lvm_t)
>>   # cjp: needs to create an interface here for fixed disk create
>>   storage_dev_filetrans_fixed_disk(lvm_t)
>>   # Access raw devices and old /dev/lvm (c 109,0).  Is this needed?
>> -storage_manage_fixed_disk(lvm_t)
>> +storage_manage_all_fixed_disk(lvm_t)
>>   term_use_all_terms(lvm_t)
>> diff --git a/policy/modules/system/systemd.te 
>> b/policy/modules/system/systemd.te
>> index 07529a5d..83f85a9d 100644
>> --- a/policy/modules/system/systemd.te
>> +++ b/policy/modules/system/systemd.te
>> @@ -472,10 +472,10 @@ fs_unmount_tmpfs(systemd_logind_t)
>>   selinux_get_enforce_mode(systemd_logind_t)
>> -storage_getattr_removable_dev(systemd_logind_t)
>> -storage_getattr_scsi_generic_dev(systemd_logind_t)
>> -storage_setattr_removable_dev(systemd_logind_t)
>> -storage_setattr_scsi_generic_dev(systemd_logind_t)
>> +storage_getattr_all_removable_dev(systemd_logind_t)
>> +storage_getattr_all_scsi_generic_dev(systemd_logind_t)
>> +storage_setattr_all_removable_dev(systemd_logind_t)
>> +storage_setattr_all_scsi_generic_dev(systemd_logind_t)
>>   term_setattr_unallocated_ttys(systemd_logind_t)
>>   term_use_unallocated_ttys(systemd_logind_t)
>>
> 
>