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ulogd: allow starting on a Debian system 

When ulogd is run by systemd on Debian, it logs messages to the journal,
it used a PID file in /run/ulog/ulogd.pid, and logs packets to
/var/log/ulog/syslogemu.log. This last ones triggers a dac_read_search
capability check because the directory is configured as:

    drwxrwx---. ulog adm /var/log/ulog

(root does not have an access to the directory without bypassing the DAC.)

Add a comment describing how to avoid allowing dac_read_search to ulogd_t.

Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
This commit is contained in:
Nicolas Iooss 2019-08-17 16:03:39 +02:00
parent d91d41b53a
commit 9686bf05a7
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2 changed files with 17 additions and 0 deletions
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2
policy/modules/services/ulogd.fc
View File

@ -2,6 +2,8 @@
/etc/rc\.d/init\.d/ulogd -- gen_context(system_u:object_r:ulogd_initrc_exec_t,s0)
/run/ulog(/*) gen_context(system_u:object_r:ulogd_var_run_t,s0)
/usr/bin/ulogd -- gen_context(system_u:object_r:ulogd_exec_t,s0)
/usr/lib/ulogd(/.*)? gen_context(system_u:object_r:ulogd_modules_t,s0)

15
policy/modules/services/ulogd.te
View File

@ -18,6 +18,9 @@ init_script_file(ulogd_initrc_exec_t)
type ulogd_modules_t;
files_type(ulogd_modules_t)
type ulogd_var_run_t;
files_pid_file(ulogd_var_run_t)
type ulogd_var_log_t;
logging_log_file(ulogd_var_log_t)
@ -26,6 +29,11 @@ logging_log_file(ulogd_var_log_t)
# Local policy
#
# If there is an AVC about capability dac_read_search being denied to ulogd_t,
# it may be caused by root not being able to access to /var/log/ulog according
# to the directory permissions. Such an issue can be fixed using ACL (for
# example with: setfacl -m u:root:rwx /var/log/ulog). Please do not add
# a rule allowing dac_read_search if you encounter this, but fix your system.
allow ulogd_t self:capability { net_admin setgid setuid sys_nice };
allow ulogd_t self:process setsched;
allow ulogd_t self:netlink_netfilter_socket create_socket_perms;
@ -38,6 +46,8 @@ read_files_pattern(ulogd_t, ulogd_etc_t, ulogd_etc_t)
list_dirs_pattern(ulogd_t, ulogd_modules_t, ulogd_modules_t)
mmap_exec_files_pattern(ulogd_t, ulogd_modules_t, ulogd_modules_t)
manage_files_pattern(ulogd_t, ulogd_var_run_t, ulogd_var_run_t)
append_files_pattern(ulogd_t, ulogd_var_log_t, ulogd_var_log_t)
create_files_pattern(ulogd_t, ulogd_var_log_t, ulogd_var_log_t)
setattr_files_pattern(ulogd_t, ulogd_var_log_t, ulogd_var_log_t)
@ -46,6 +56,11 @@ logging_log_filetrans(ulogd_t, ulogd_var_log_t, file)
files_read_etc_files(ulogd_t)
files_read_usr_files(ulogd_t)
# For /proc/sys/kernel/ngroups_max
kernel_read_kernel_sysctls(ulogd_t)
logging_send_syslog_msg(ulogd_t)
miscfiles_read_localization(ulogd_t)
sysnet_dns_name_resolve(ulogd_t)