2020-01-21 16:04:12

by Sugar, David

Subject: [PATCH v2] audit daemon can halt system, allow this to happen.

auditd can halt the system for several reasons based on configuration.
These mostly revovle around audit partition full issues. I am seeing
the following denials when attempting to halt the system.

Jan 12 03:38:48 localhost audispd: node=localhost type=USER_AVC msg=audit(1578800328.122:1943): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='avc: denied { start } for auid=n/a uid=0 gid=0 path="/usr/lib/systemd/system/poweroff.target" cmdline="/sbin/init 0" scontext=system_u:system_r:auditd_t:s0 tcontext=system_u:object_r:power_unit_t:s0 tclass=service exe="/usr/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?'
Jan 12 03:38:48 localhost audispd: node=localhost type=USER_AVC msg=audit(1578800328.147:1944): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='avc: denied { status } for auid=n/a uid=0 gid=0 path="/usr/lib/systemd/system/poweroff.target" cmdline="/sbin/init 0" scontext=system_u:system_r:auditd_t:s0 tcontext=system_u:object_r:power_unit_t:s0 tclass=service exe="/usr/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?'
Jan 12 04:44:54 localhost audispd: node=localhost type=AVC msg=audit(1578804294.103:1923): avc: denied { getattr } for pid=6936 comm="systemctl" path="/run/systemd/system" dev="tmpfs" ino=45 scontext=system_u:system_r:auditd_t:s0 tcontext=system_u:object_r:systemd_unit_t:s0 tclass=dir permissive=1

v2 - use optional rather than ifdef

Signed-off-by: Dave Sugar <[email protected]>
---
policy/modules/system/logging.te | 6 ++++++
policy/modules/system/systemd.if | 20 ++++++++++++++++++++
2 files changed, 26 insertions(+)

diff --git a/policy/modules/system/logging.te b/policy/modules/system/logging.te
index 4c11d061..a4c46c81 100644
--- a/policy/modules/system/logging.te
+++ b/policy/modules/system/logging.te
@@ -223,6 +223,12 @@ ifdef(`distro_ubuntu',`
')
')

+optional_policy(`
+ init_list_unit_dirs(auditd_t)
+ systemd_start_power_units(auditd_t)
+ systemd_status_power_units(auditd_t)
+')
+
optional_policy(`
mta_send_mail(auditd_t)
')
diff --git a/policy/modules/system/systemd.if b/policy/modules/system/systemd.if
index a49b0f77..8e46f443 100644
--- a/policy/modules/system/systemd.if
+++ b/policy/modules/system/systemd.if
@@ -791,6 +791,26 @@ interface(`systemd_start_power_units',`
allow $1 power_unit_t:service start;
')

+########################################
+## <summary>
+## Get the system status information about power units
+## </summary>
+## <param name="domain">
+## <summary>
+## Domain allowed access.
+## </summary>
+## </param>
+#
+interface(`systemd_status_power_units',`
+ gen_require(`
+ type power_unit_t;
+ class service status;
+ ')
+
+ allow $1 power_unit_t:service status;
+')
+
+
########################################
## <summary>
## Make the specified type usable for
--
2.24.1

2020-01-22 10:07:57

by Chris PeBenito

Subject: Re: [PATCH v2] audit daemon can halt system, allow this to happen.

On 1/21/20 11:04 AM, Sugar, David wrote:
> auditd can halt the system for several reasons based on configuration.
> These mostly revovle around audit partition full issues. I am seeing
> the following denials when attempting to halt the system.
>
> Jan 12 03:38:48 localhost audispd: node=localhost type=USER_AVC msg=audit(1578800328.122:1943): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='avc: denied { start } for auid=n/a uid=0 gid=0 path="/usr/lib/systemd/system/poweroff.target" cmdline="/sbin/init 0" scontext=system_u:system_r:auditd_t:s0 tcontext=system_u:object_r:power_unit_t:s0 tclass=service exe="/usr/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?'
> Jan 12 03:38:48 localhost audispd: node=localhost type=USER_AVC msg=audit(1578800328.147:1944): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='avc: denied { status } for auid=n/a uid=0 gid=0 path="/usr/lib/systemd/system/poweroff.target" cmdline="/sbin/init 0" scontext=system_u:system_r:auditd_t:s0 tcontext=system_u:object_r:power_unit_t:s0 tclass=service exe="/usr/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?'
> Jan 12 04:44:54 localhost audispd: node=localhost type=AVC msg=audit(1578804294.103:1923): avc: denied { getattr } for pid=6936 comm="systemctl" path="/run/systemd/system" dev="tmpfs" ino=45 scontext=system_u:system_r:auditd_t:s0 tcontext=system_u:object_r:systemd_unit_t:s0 tclass=dir permissive=1
>
> v2 - use optional rather than ifdef
>
> Signed-off-by: Dave Sugar <[email protected]>
> ---
> policy/modules/system/logging.te | 6 ++++++
> policy/modules/system/systemd.if | 20 ++++++++++++++++++++
> 2 files changed, 26 insertions(+)
>
> diff --git a/policy/modules/system/logging.te b/policy/modules/system/logging.te
> index 4c11d061..a4c46c81 100644
> --- a/policy/modules/system/logging.te
> +++ b/policy/modules/system/logging.te
> @@ -223,6 +223,12 @@ ifdef(`distro_ubuntu',`
> ')
> ')
>
> +optional_policy(`
> + init_list_unit_dirs(auditd_t)
> + systemd_start_power_units(auditd_t)
> + systemd_status_power_units(auditd_t)
> +')
> +

Needs to move down between the seutil and udev optionals.

--
Chris PeBenito