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dracut: various fixes #19

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dracut: various fixes #19

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81be1fc
dracut: Added dracut_conf_t type.
jpds May 13, 2021
f02254d
dracut.te: Added domain obj/role/system change exemptions.
jpds May 13, 2021
549122b
dracut.te: Added fs_getattr_xattr_fs().
jpds May 13, 2021
e780aa5
dracut.te: Added files_mmap_read_kernel_modules().
jpds May 13, 2021
0dc68f2
dracut.te: Added dev_read_urand().
jpds May 13, 2021
2d8964d
dracut.te: Added files_tmp_filetrans().
jpds May 13, 2021
97bad4a
dracut.te: Added portage_domtrans_gcc_config().
jpds May 13, 2021
6f345dc
dracut.te: Allow more process and capability features.
jpds May 13, 2021
aff6e26
dracut.te: Added files_unconfined().
jpds May 13, 2021
fd9969f
dracut.te: Added seutil_relabelto_bin_policy().
jpds May 13, 2021
8348287
dracut.te: Added storage_getattr_fixed_disk_dev().
jpds May 13, 2021
1c05d33
dracut.te: Use libs_run_ldconfig() instead of exec.
jpds Jun 14, 2021
de8cd4b
portage.te: Added dracut_run().
jpds Jun 14, 2021
ca279cf
dracut.fc: Added dracut-install as dracut_exec_t.
jpds Jun 14, 2021
b9fb2f2
dracut.te: Added storage_raw_rw_fixed_disk().
jpds Jun 14, 2021
ddbc34a
dracut.te: Added LVM control accesses.
jpds Jun 15, 2021
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4 changes: 4 additions & 0 deletions policy/modules/admin/portage.te
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Original file line number Diff line number Diff line change
Expand Up @@ -229,6 +229,10 @@ optional_policy(`
cron_system_entry(portage_fetch_t, portage_fetch_exec_t)
')

optional_policy(`
dracut_run(portage_t, portage_roles)
')

optional_policy(`
gpg_spec_domtrans(portage_t, portage_fetch_t)
')
Expand Down
5 changes: 4 additions & 1 deletion policy/modules/contrib/dracut.fc
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Original file line number Diff line number Diff line change
@@ -1,5 +1,8 @@
/etc/dracut\.conf -- gen_context(system_u:object_r:dracut_conf_t,s0)
/etc/dracut\.conf\.d(/.*)? gen_context(system_u:object_r:dracut_conf_t,s0)
#
# /usr
#
/usr/sbin/dracut -- gen_context(system_u:object_r:dracut_exec_t,s0)
/usr/bin/dracut -- gen_context(system_u:object_r:dracut_exec_t,s0)
/usr/lib/dracut/dracut-install -- gen_context(system_u:object_r:dracut_exec_t,s0)
/usr/sbin/dracut -- gen_context(system_u:object_r:dracut_exec_t,s0)
38 changes: 35 additions & 3 deletions policy/modules/contrib/dracut.te
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Original file line number Diff line number Diff line change
Expand Up @@ -4,21 +4,30 @@ type dracut_t;
type dracut_exec_t;
application_domain(dracut_t, dracut_exec_t)

type dracut_conf_t;
files_config_file(dracut_conf_t)

type dracut_var_log_t;
logging_log_file(dracut_var_log_t)

type dracut_tmp_t;
files_tmp_file(dracut_tmp_t)

attribute_role dracut_roles;
role dracut_roles types dracut_t;

########################################
#
# Local policy
#
allow dracut_t self:process setfscreate;
allow dracut_t self:capability dac_override;
allow dracut_t self:process { getsched setfscreate };
allow dracut_t self:capability { dac_override dac_read_search fsetid mknod sys_admin };
allow dracut_t self:fifo_file rw_fifo_file_perms;
allow dracut_t self:unix_stream_socket create_stream_socket_perms;

list_dirs_pattern(dracut_t, dracut_conf_t, dracut_conf_t)
read_files_pattern(dracut_t, dracut_conf_t, dracut_conf_t)

manage_files_pattern(dracut_t, dracut_tmp_t, dracut_tmp_t)
manage_dirs_pattern(dracut_t, dracut_tmp_t, dracut_tmp_t)
manage_lnk_files_pattern(dracut_t, dracut_tmp_t, dracut_tmp_t)
Expand All @@ -28,25 +37,40 @@ files_tmp_filetrans(dracut_t, dracut_tmp_t, dir)
manage_files_pattern(dracut_t, dracut_var_log_t, dracut_var_log_t)
logging_log_filetrans(dracut_t, dracut_var_log_t, file)

auth_manage_shadow(dracut_t)
auth_relabelto_shadow(dracut_t)

domain_obj_id_change_exemption(dracut_t)
domain_role_change_exemption(dracut_t)
domain_system_change_exemption(dracut_t)
Comment on lines +40 to +45
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uh these are dangerous permissions. Why does dracut need to manage shadow?

Also I'd need a pretty strong justification if things need the foo_change_exemption() rules, those are usually for things like login managers that need to switch to different users or security levels etc.

sometimes those rules showing up means PAM or chk_passwd stuff. does this instead need auth_use_pam(dracut_t) or maybe auth_use_nsswitch?

I see this line: modules.d/99base/module-setup.sh:33: [[ $hostonly ]] && grep '^root:' "$dracutsysrootdir"/etc/shadow >> "$initdir/etc/shadow" but at the most that should need read_shadow not manage_shadow right?

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These are needed because dracut does this:

#!!!! This avc is a constraint violation.  You would need to modify the attributes of either the source or target types to allow this access.
#Constraint rule:
#       constrain file { create relabelfrom relabelto } ((u1 == u2 -Fail-)  or (t1 == can_change_object_identity -Fail-) ); Constraint DENIED

#       Possible cause is the source user (staff_u) and target user (system_u) are different.
allow dracut_t modules_object_t:file relabelto;

Also needs manage_shadow as otherwise it hits a neverallow rule with the files_unconfined permission.


kernel_read_messages(dracut_t)
kernel_read_system_state(dracut_t)

corecmd_exec_bin(dracut_t)
corecmd_exec_shell(dracut_t)
corecmd_mmap_all_executables(dracut_t)

dev_getattr_lvm_control(dracut_t)
dev_read_lvm_control(dracut_t)
dev_read_kmsg(dracut_t)
dev_read_sysfs(dracut_t)
dev_read_urand(dracut_t)

domain_use_interactive_fds(dracut_t)

files_create_kernel_img(dracut_t)
files_mmap_read_kernel_modules(dracut_t)
files_read_etc_files(dracut_t)
files_read_kernel_modules(dracut_t)
files_read_usr_files(dracut_t)
files_search_runtime(dracut_t)
files_tmp_filetrans(dracut_t, dracut_tmp_t, { file dir })
files_unconfined(dracut_t)

libs_exec_ldconfig(dracut_t)
fs_getattr_xattr_fs(dracut_t)

libs_run_ldconfig(dracut_t, dracut_roles)
libs_exec_ld_so(dracut_t)
libs_exec_lib_files(dracut_t)

Expand All @@ -55,6 +79,11 @@ miscfiles_read_localization(dracut_t)
modutils_read_module_config(dracut_t)
modutils_read_module_deps(dracut_t)

seutil_relabelto_bin_policy(dracut_t)

storage_getattr_fixed_disk_dev(dracut_t)
storage_raw_rw_fixed_disk(dracut_t)

udev_read_rules_files(dracut_t)

userdom_search_user_home_dirs(dracut_t)
Expand All @@ -64,3 +93,6 @@ optional_policy(`
lvm_read_config(dracut_t)
')

ifdef(`distro_gentoo',`
portage_domtrans_gcc_config(dracut_t)
')