Minor updates on fcron and snort

Small set of changes to fcron and snort

Sven Vermeulen (2):
Snort policy updates
fcron socket support

 cron.if  | 5 +++++
 cron.te  | 2 ++
 snort.fc | 1 +
 snort.te | 3 ++-
 4 files changed, 10 insertions(+), 1 deletion(-)

1.8.3.2

When snort starts up, its init script creates the /var/run/snort directory. However, the policy did not have a file transition for this, which results in the /var/run/snort directory to be initrc_var_run_t.

By supporting a file transition to snort_var_run_t the PID file can be hosted inside its own directory as intended.

Error logs from Snort:

Apr  9 14:42:45 server snort[1916]: WARNING: /var/run/snort is invalid,
trying /var/run...
Apr  9 14:42:45 server snort[1916]: Previous Error, errno=13,
(Permission denied)
Apr  9 14:42:45 server snort[1916]: PID path stat checked out ok, PID

path set to /var/run/

Second, snort is not able to write to its own log file. It needs the write privilege for this (append no longer cuts it) as found through the AVC denial.

Error logs from Snort:

Apr  9 14:42:45 server snort[1916]: FATAL ERROR: spo_unified2.c(320)

Could not open /var/log/snort//merged.log: Permission denied

---
 snort.fc | 1 +
 snort.te | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

index 591b9a1..2b1ea6b 100644
@@ -10,3 +10,4 @@
 /var/log/snort(/.*)?	gen_context(system_u:object_r:snort_log_t,s0)
 
 /var/run/snort.*	--	gen_context(system_u:object_r:snort_var_run_t,s0)
+/var/run/snort(/.*)?	gen_context(system_u:object_r:snort_var_run_t,s0)

index 1af72df..2d78724 100644
@@ -23,6 +23,7 @@ files_tmp_file(snort_tmp_t)
 
 type snort_var_run_t;
 files_pid_file(snort_var_run_t)
+init_daemon_run_dir(snort_var_run_t, "snort")
 
 ########################################
 #

@@ -43,9 +44,9 @@ allow snort_t snort_etc_t:file read_file_perms;
 allow snort_t snort_etc_t:lnk_file read_lnk_file_perms;
 
 manage_dirs_pattern(snort_t, snort_log_t, snort_log_t)
-append_files_pattern(snort_t, snort_log_t, snort_log_t)
 create_files_pattern(snort_t, snort_log_t, snort_log_t)
 setattr_files_pattern(snort_t, snort_log_t, snort_log_t)
+write_files_pattern(snort_t, snort_log_t, snort_log_t)
 logging_log_filetrans(snort_t, snort_log_t, { file dir })
 
 manage_dirs_pattern(snort_t, snort_tmp_t, snort_tmp_t)

1.8.3.2

The fcron daemon creates a socket file in /var/run (called fcron.fifo) which is used by the fcrondyn application to interact with the fcron daemon. This application allows admins to list the defined jobs, run jobs immediately, remove jobs, etc.

Without this, fcrondyn cannot connect to the cron daemon; fcron also logs this at start-up:

fcron[23724]: Cannot bind socket to '/var/run/fcron.fifo': Permission denied

Through this patch, we allow the crond daemon to create this socket and update the admin role to allow the admin domain to stream_connect through this socket to the crond_t domain.

---
 cron.if | 5 +++++
 cron.te | 2 ++
 2 files changed, 7 insertions(+)

index 1303b30..4ee25fd 100644
@@ -277,6 +277,11 @@ interface(`cron_admin_role',`
 		dontaudit $2 cronjob_t:process { ptrace signal_perms };
 	')
 
+	tunable_policy(`crond_fcron',`
+		# Support for fcrondyn
+		stream_connect_pattern($1, crond_var_run_t, crond_var_run_t, crond_t)
+	')
+
 	optional_policy(`
 		gen_require(`
 			class dbus send_msg;

index bd8a5cc..a2cc311 100644
@@ -347,6 +347,8 @@ tunable_policy(`allow_polyinstantiation',`
 
 tunable_policy(`fcron_crond',`
 	allow crond_t { system_cron_spool_t user_cron_spool_t }:file manage_file_perms;
+	allow crond_t crond_var_run_t:sock_file manage_sock_file_perms;
+	files_pid_filetrans(crond_t, crond_var_run_t, sock_file, "fcron.fifo")
 ')
 
 optional_policy(`

1.8.3.2