[PATCH] Denial of cryptsetup reading cracklib database

[PATCH] Denial of cryptsetup reading cracklib database

[Sugar, David]

When setting up a LUKS encrypted partition, cryptsetup is reading
the cracklib databases to ensure password strength.  This is
allowing the needed access.

type=AVC msg=audit(1553216939.261:2652): avc:  denied  { search } for  pid=8107 comm="cryptsetup" name="cracklib" dev="dm-1" ino=6388736 scontext=sysadm_u:sysadm_r:lvm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:crack_db_t:s0 tclass=dir permissive=0
type=AVC msg=audit(1553216980.909:2686): avc:  denied  { read } for  pid=8125 comm="cryptsetup" name="pw_dict.pwd" dev="dm-1" ino=6388748 scontext=sysadm_u:sysadm_r:lvm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:crack_db_t:s0 tclass=file permissive=1
type=AVC msg=audit(1553216980.909:2686): avc:  denied  { open } for  pid=8125 comm="cryptsetup" path="/usr/share/cracklib/pw_dict.pwd" dev="dm-1" ino=6388748 scontext=sysadm_u:sysadm_r:lvm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:crack_db_t:s0 tclass=file permissive=1
type=AVC msg=audit(1553216980.909:2687): avc:  denied  { getattr } for  pid=8125 comm="cryptsetup" path="/usr/share/cracklib/pw_dict.pwi" dev="dm-1" ino=6388749 scontext=sysadm_u:sysadm_r:lvm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:crack_db_t:s0 tclass=file permissive=1

Signed-off-by: Dave Sugar <dsugar@tresys.com>
---
 policy/modules/system/lvm.te | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/policy/modules/system/lvm.te b/policy/modules/system/lvm.te
index ba64c39d..bb71e7b9 100644
--- a/policy/modules/system/lvm.te
+++ b/policy/modules/system/lvm.te
@@ -375,6 +375,10 @@ optional_policy(`
 	udev_read_pid_files(lvm_t)
 ')
 
+optional_policy(`
+	usermanage_read_crack_db(lvm_t)
+')
+
 optional_policy(`
 	virt_manage_images(lvm_t)
 ')
-- 
2.20.1

Re: [PATCH] Denial of cryptsetup reading cracklib database

[Chris PeBenito]

On 3/26/19 9:50 PM, Sugar, David wrote:
> When setting up a LUKS encrypted partition, cryptsetup is reading
> the cracklib databases to ensure password strength.  This is
> allowing the needed access.
> 
> type=AVC msg=audit(1553216939.261:2652): avc:  denied  { search } for  pid=8107 comm="cryptsetup" name="cracklib" dev="dm-1" ino=6388736 scontext=sysadm_u:sysadm_r:lvm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:crack_db_t:s0 tclass=dir permissive=0
> type=AVC msg=audit(1553216980.909:2686): avc:  denied  { read } for  pid=8125 comm="cryptsetup" name="pw_dict.pwd" dev="dm-1" ino=6388748 scontext=sysadm_u:sysadm_r:lvm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:crack_db_t:s0 tclass=file permissive=1
> type=AVC msg=audit(1553216980.909:2686): avc:  denied  { open } for  pid=8125 comm="cryptsetup" path="/usr/share/cracklib/pw_dict.pwd" dev="dm-1" ino=6388748 scontext=sysadm_u:sysadm_r:lvm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:crack_db_t:s0 tclass=file permissive=1
> type=AVC msg=audit(1553216980.909:2687): avc:  denied  { getattr } for  pid=8125 comm="cryptsetup" path="/usr/share/cracklib/pw_dict.pwi" dev="dm-1" ino=6388749 scontext=sysadm_u:sysadm_r:lvm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:crack_db_t:s0 tclass=file permissive=1
> 
> Signed-off-by: Dave Sugar <dsugar@tresys.com>
> ---
>   policy/modules/system/lvm.te | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/policy/modules/system/lvm.te b/policy/modules/system/lvm.te
> index ba64c39d..bb71e7b9 100644
> --- a/policy/modules/system/lvm.te
> +++ b/policy/modules/system/lvm.te
> @@ -375,6 +375,10 @@ optional_policy(`
>   	udev_read_pid_files(lvm_t)
>   ')
>   
> +optional_policy(`
> +	usermanage_read_crack_db(lvm_t)
> +')
> +
>   optional_policy(`
>   	virt_manage_images(lvm_t)
>   ')

Merged.

-- 
Chris PeBenito