2019-03-27 01:50:50

by Sugar, David

Subject: [PATCH] Denial of cryptsetup reading cracklib database

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 <[email protected]>
---
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

2019-03-27 22:53:38

by Chris PeBenito

Subject: Re: [PATCH] Denial of cryptsetup reading cracklib database

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 <[email protected]>
> ---
> 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