Selinux policy for beanstalkd

[Ruben Kerkhof <ruben@xxxxxxxxxxxxxxxx>]

Hi list,

I haven't written an selinux module before, so to start simple I
created one for beanstalkd, since we use this a lot.

I'm running into one issue though:

beanstalkd has the ability to create binary log files in
/var/lib/beanstalkd/binlog.
This directory doesn't exist by default, but it is created in the init script.

Starting up beanstalkd creates an AVC denial:
type=AVC msg=audit(1263749015.682:199): avc:  denied  { create } for
pid=2163 comm="mkdir" name="beanstalkd"
scontext=unconfined_u:system_r:initrc_t:s0
tcontext=unconfined_u:object_r:var_lib_t:s0 tclass=dir
type=SYSCALL msg=audit(1263749015.682:199): arch=c000003e syscall=83
success=no exit=-13 a0=7fff4e491f7b a1=1ed a2=7fff4e490770
a3=7fff4e4902c0 items=0 ppid=2156 pid=2163 auid=500 uid=0 gid=0 euid=0
suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=6 comm="mkdir"
exe="/bin/mkdir" subj=unconfined_u:system_r:initrc_t:s0 key=(null)

How do I allow the init script to do mkdir -p /var/lib/beanstalkd/binlog?

Here's my policy:

[root@ruben ~]# cat beanstalkd.fc
/usr/bin/beanstalkd             --
gen_context(system_u:object_r:beanstalkd_exec_t,s0)
/etc/rc\.d/init\.d/beanstalkd   --
gen_context(system_u:object_r:beanstalkd_initrc_exec_t,s0)
/var/lib/beanstalkd(/.*)?
gen_context(system_u:object_r:beanstalkd_var_lib_t,s0)

[root@ruben ~]# cat beanstalkd.te
policy_module(beanstalkd,1.0.0)

########################################
#
# Declarations
#

type beanstalkd_t;
type beanstalkd_exec_t;
init_daemon_domain(beanstalkd_t, beanstalkd_exec_t)

type beanstalkd_initrc_exec_t;
init_script_file(beanstalkd_initrc_exec_t)

type beanstalkd_var_lib_t;
files_type(beanstalkd_var_lib_t)

########################################
#
# beanstalkd local policy
#

allow beanstalkd_t self:capability { dac_override setgid setuid };
allow beanstalkd_t self:process { fork setrlimit };
allow beanstalkd_t self:tcp_socket create_stream_socket_perms;

manage_files_pattern(beanstalkd_t, beanstalkd_var_lib_t, beanstalkd_var_lib_t)
files_var_lib_filetrans(beanstalkd_t, beanstalkd_var_lib_t, file)

corenet_tcp_sendrecv_generic_if(beanstalkd_t)
corenet_tcp_sendrecv_generic_node(beanstalkd_t)
corenet_tcp_sendrecv_all_ports(beanstalkd_t)
corenet_tcp_bind_generic_node(beanstalkd_t)
corenet_tcp_bind_generic_node(beanstalkd_t)

# FIXME: we need a beanstalkd_port (tcp, 11300) in core policy
corenet_tcp_bind_all_unreserved_ports(beanstalkd_t)


fs_dontaudit_getattr_all_fs(beanstalkd_t)

domain_use_interactive_fds(beanstalkd_t)

auth_use_nsswitch(beanstalkd_t)

[root@ruben ~]# cat beanstalkd.if

## <summary>policy for beanstalkd</summary>

########################################
## <summary>
##	Execute a domain transition to run beanstalkd.
## </summary>
## <param name="domain">
## <summary>
##	Domain allowed to transition.
## </summary>
## </param>
#
interface(`beanstalkd_domtrans',`
	gen_require(`
		type beanstalkd_t, beanstalkd_exec_t;
	')

	domtrans_pattern($1, beanstalkd_exec_t, beanstalkd_t)
')


########################################
## <summary>
##	Execute beanstalkd server in the beanstalkd domain.
## </summary>
## <param name="domain">
##	<summary>
##	The type of the process performing this action.
##	</summary>
## </param>
#
interface(`beanstalkd_initrc_domtrans',`
	gen_require(`
		type beanstalkd_initrc_exec_t;
	')

	init_labeled_script_domtrans($1, beanstalkd_initrc_exec_t)
')

########################################
## <summary>
##	All of the rules required to administrate
##	an beanstalkd environment
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <param name="role">
##	<summary>
##	Role allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`beanstalkd_admin',`
	gen_require(`
		type beanstalkd_t;
	')

	allow $1 beanstalkd_t:process { ptrace signal_perms getattr };
	read_files_pattern($1, beanstalkd_t, beanstalkd_t)
	

	gen_require(`
		type beanstalkd_initrc_exec_t;
	')

	beanstalkd_initrc_domtrans($1)
	domain_system_change_exemption($1)
	role_transition $2 beanstalkd_initrc_exec_t system_r;
	allow $2 system_r;

')

Kind regards,

Ruben Kerkhof
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