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