Re: [PATCH 2/5] grant permission for rpm to write to audit log

Dominick Grift <[email protected]> Tue, 2 Jul 2019 18:03:51 +0200
Newsgroups	org.kernel.vger.selinux-refpolicy
Message-ID	<[email protected]>
On Tue, Jul 02, 2019 at 03:30:30PM +0000, Sugar, David wrote:
> Messages like this are added to the audit log when an rpm is installed:
> type=SOFTWARE_UPDATE msg=audit(1560913896.581:244): pid=1265 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:rpm_t:s0 msg='sw="ntpdate-4.2.6p5-25.el7_3.2.x86_64" sw_type=rpm key_enforce=0 gpg_res=0 root_dir="/" comm="rpm" exe="/usr/bin/rpm" hostname=? addr=?  terminal=? res=success'
> 
> These are the denials that I'm seeing:
> type=AVC msg=audit(1560913896.581:243): avc:  denied  { audit_write } for  pid=1265 comm="rpm" capability=29 scontext=system_u:system_r:rpm_t:s0 tcontext=system_u:system_r:rpm_t:s0 tclass=capability permissive=1
> 
> type=AVC msg=audit(1561298132.446:240): avc:  denied  { create } for pid=1266 comm="rpm" scontext=system_u:system_r:rpm_t:s0 tcontext=system_u:system_r:rpm_t:s0 tclass=netlink_audit_socket permissive=1
> type=AVC msg=audit(1561298132.446:241): avc:  denied  { write } for pid=1266 comm="rpm" scontext=system_u:system_r:rpm_t:s0 tcontext=system_u:system_r:rpm_t:s0 tclass=netlink_audit_socket permissive=1
> type=AVC msg=audit(1561298132.446:241): avc:  denied  { nlmsg_relay } for  pid=1266 comm="rpm" scontext=system_u:system_r:rpm_t:s0 tcontext=system_u:system_r:rpm_t:s0 tclass=netlink_audit_socket permissive=1
> type=AVC msg=audit(1561298132.447:243): avc:  denied  { read } for pid=1266 comm="rpm" scontext=system_u:system_r:rpm_t:s0 tcontext=system_u:system_r:rpm_t:s0 tclass=netlink_audit_socket permissive=1

There is an interface for that: logging_send_audit_msgs(rpm_t)

> 
> Signed-off-by: Dave Sugar <[email protected]>
> ---
>  policy/modules/admin/rpm.te | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/policy/modules/admin/rpm.te b/policy/modules/admin/rpm.te
> index 0e6e9c03..a28a24d3 100644
> --- a/policy/modules/admin/rpm.te
> +++ b/policy/modules/admin/rpm.te
> @@ -73,7 +73,7 @@ files_tmpfs_file(rpm_script_tmpfs_t)
>  # rpm Local policy
>  #
>  
> -allow rpm_t self:capability { chown dac_override fowner fsetid ipc_lock mknod setfcap setgid setuid sys_chroot sys_nice sys_tty_config };
> +allow rpm_t self:capability { audit_write chown dac_override fowner fsetid ipc_lock mknod setfcap setgid setuid sys_chroot sys_nice sys_tty_config };
>  allow rpm_t self:process { transition signal_perms getsched setsched getsession getpgid setpgid getcap setcap share getattr setexec setfscreate noatsecure siginh setrlimit rlimitinh dyntransition execmem setkeycreate setsockcreate getrlimit };
>  allow rpm_t self:fd use;
>  allow rpm_t self:fifo_file rw_fifo_file_perms;
> @@ -87,6 +87,7 @@ allow rpm_t self:msgq create_msgq_perms;
>  allow rpm_t self:msg { send receive };
>  allow rpm_t self:file rw_file_perms;
>  allow rpm_t self:netlink_kobject_uevent_socket create_socket_perms;
> +allow rpm_t self:netlink_audit_socket { nlmsg_relay create_socket_perms };
>  
>  allow rpm_t rpm_log_t:file { append_file_perms create_file_perms setattr_file_perms };
>  logging_log_filetrans(rpm_t, rpm_log_t, file)
> -- 
> 2.21.0
> 

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