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bootloader: stricter permissions and more tailored file contexts 

Update the bootloader module so that it can manage only its
own runtime files and not all boot_t files (which include,
for example, the common locations for kernel images and
initramfs archives) and so that it can execute only its own
etc files (needed by grub2-mkconfig) and not all etc_t files
which is more dangerous.

Signed-off-by: Guido Trentalancia <guido@trentalancia.net>
This commit is contained in:
Guido Trentalancia 2016-12-23 01:22:39 +01:00 committed by Chris PeBenito
parent f850ec37df
commit b0c13980d2
2 changed files with 19 additions and 4 deletions
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6
policy/modules/admin/bootloader.fc
View File

@ -1,6 +1,12 @@
/boot/grub.* -d gen_context(system_u:object_r:bootloader_run_t,s0)
/boot/grub.*/.* gen_context(system_u:object_r:bootloader_run_t,s0)
/boot/grub.*/grub.cfg -- gen_context(system_u:object_r:bootloader_etc_t,s0)
/boot/grub.*/grub.conf -- gen_context(system_u:object_r:bootloader_etc_t,s0)
/etc/lilo\.conf.* -- gen_context(system_u:object_r:bootloader_etc_t,s0) /etc/lilo\.conf.* -- gen_context(system_u:object_r:bootloader_etc_t,s0)
/etc/yaboot\.conf.* -- gen_context(system_u:object_r:bootloader_etc_t,s0) /etc/yaboot\.conf.* -- gen_context(system_u:object_r:bootloader_etc_t,s0)
/etc/grub.d(/.*)? -- gen_context(system_u:object_r:bootloader_etc_t,s0)
/sbin/grub -- gen_context(system_u:object_r:bootloader_exec_t,s0) /sbin/grub -- gen_context(system_u:object_r:bootloader_exec_t,s0)
/sbin/lilo.* -- gen_context(system_u:object_r:bootloader_exec_t,s0) /sbin/lilo.* -- gen_context(system_u:object_r:bootloader_exec_t,s0)

17
policy/modules/admin/bootloader.te
View File

@ -21,6 +21,13 @@ type bootloader_exec_t;
application_domain(bootloader_t, bootloader_exec_t) application_domain(bootloader_t, bootloader_exec_t)
role bootloader_roles types bootloader_t; role bootloader_roles types bootloader_t;
#
# bootloader_run_t are image and other runtime
# files
#
type bootloader_run_t alias run_bootloader_t;
files_type(bootloader_run_t)
# #
# bootloader_etc_t is the configuration file, # bootloader_etc_t is the configuration file,
# grub.conf, lilo.conf, etc. # grub.conf, lilo.conf, etc.
@ -45,7 +52,7 @@ allow bootloader_t self:capability { dac_override dac_read_search fsetid sys_raw
allow bootloader_t self:process { signal_perms execmem }; allow bootloader_t self:process { signal_perms execmem };
allow bootloader_t self:fifo_file rw_fifo_file_perms; allow bootloader_t self:fifo_file rw_fifo_file_perms;
allow bootloader_t bootloader_etc_t:file read_file_perms; allow bootloader_t bootloader_etc_t:file exec_file_perms;
# uncomment the following lines if you use "lilo -p" # uncomment the following lines if you use "lilo -p"
#allow bootloader_t bootloader_etc_t:file manage_file_perms; #allow bootloader_t bootloader_etc_t:file manage_file_perms;
#files_etc_filetrans(bootloader_t,bootloader_etc_t,file) #files_etc_filetrans(bootloader_t,bootloader_etc_t,file)
@ -59,6 +66,11 @@ files_tmp_filetrans(bootloader_t, bootloader_tmp_t, { dir file lnk_file chr_file
# for tune2fs (cjp: ?) # for tune2fs (cjp: ?)
files_root_filetrans(bootloader_t, bootloader_tmp_t, file) files_root_filetrans(bootloader_t, bootloader_tmp_t, file)
manage_dirs_pattern(bootloader_t, bootloader_run_t, bootloader_run_t)
manage_files_pattern(bootloader_t, bootloader_run_t, bootloader_run_t)
manage_lnk_files_pattern(bootloader_t, bootloader_run_t, bootloader_run_t)
files_boot_filetrans(bootloader_t, bootloader_run_t, { dir file lnk_file })
kernel_getattr_core_if(bootloader_t) kernel_getattr_core_if(bootloader_t)
kernel_read_network_state(bootloader_t) kernel_read_network_state(bootloader_t)
kernel_read_system_state(bootloader_t) kernel_read_system_state(bootloader_t)
@ -96,10 +108,7 @@ corecmd_exec_all_executables(bootloader_t)
domain_use_interactive_fds(bootloader_t) domain_use_interactive_fds(bootloader_t)
files_create_boot_dirs(bootloader_t) files_create_boot_dirs(bootloader_t)
files_manage_boot_files(bootloader_t)
files_manage_boot_symlinks(bootloader_t)
files_read_etc_files(bootloader_t) files_read_etc_files(bootloader_t)
files_exec_etc_files(bootloader_t)
files_read_usr_src_files(bootloader_t) files_read_usr_src_files(bootloader_t)
files_read_usr_files(bootloader_t) files_read_usr_files(bootloader_t)
files_read_var_files(bootloader_t) files_read_var_files(bootloader_t)