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authlogin: add new type for pwd.lock and others 

This is in response to systemd needing to write to .pwd.lock in support
of dynamic users, which is currently labeled shadow_t despite systemd
seemingly not making any actual modifications to /etc/passwd or
/etc/shadow. Instead of granting potentially overly permissive access,
this commit assigns a new type to these lock files.

Signed-off-by: Kenton Groombridge <me@concord.sh>
This commit is contained in:
Kenton Groombridge 2021-04-09 09:00:55 -04:00
parent 8eff2c5998
commit 26e9ec7c43
3 changed files with 26 additions and 3 deletions
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6
policy/modules/system/authlogin.fc
View File

@ -1,7 +1,7 @@
/etc/\.pwd\.lock -- gen_context(system_u:object_r:shadow_t,s0)
/etc/group\.lock -- gen_context(system_u:object_r:shadow_t,s0)
/etc/\.pwd\.lock -- gen_context(system_u:object_r:shadow_lock_t,s0)
/etc/group\.lock -- gen_context(system_u:object_r:shadow_lock_t,s0)
/etc/passwd\.lock -- gen_context(system_u:object_r:shadow_lock_t,s0)
/etc/gshadow.* -- gen_context(system_u:object_r:shadow_t,s0)
/etc/passwd\.lock -- gen_context(system_u:object_r:shadow_t,s0)
/etc/shadow.* -- gen_context(system_u:object_r:shadow_t,s0)
/usr/bin/login -- gen_context(system_u:object_r:login_exec_t,s0)

20
policy/modules/system/authlogin.if
View File

@ -679,6 +679,7 @@ interface(`auth_rw_shadow',`
')
files_list_etc($1)
auth_rw_shadow_lock($1)
allow $1 shadow_t:file rw_file_perms;
typeattribute $1 can_read_shadow_passwords, can_write_shadow_passwords;
')
@ -700,6 +701,7 @@ interface(`auth_manage_shadow',`
type shadow_t;
')
auth_rw_shadow_lock($1)
allow $1 shadow_t:file manage_file_perms;
typeattribute $1 can_read_shadow_passwords, can_write_shadow_passwords;
')
@ -771,6 +773,24 @@ interface(`auth_relabel_shadow',`
typeattribute $1 can_relabelto_shadow_passwords;
')
########################################
## <summary>
## Read/Write shadow lock files.
## </summary>
## <param name="domain">
## <summary>
## Domain allowed access.
## </summary>
## </param>
#
interface(`auth_rw_shadow_lock',`
gen_require(`
type shadow_lock_t;
')
rw_files_pattern($1, shadow_lock_t, shadow_lock_t)
')
#######################################
## <summary>
## Append to the login failure log.

3
policy/modules/system/authlogin.te
View File

@ -65,6 +65,9 @@ neverallow ~can_read_shadow_passwords shadow_t:file read;
neverallow ~can_write_shadow_passwords shadow_t:file { create write };
neverallow ~can_relabelto_shadow_passwords shadow_t:file relabelto;
type shadow_lock_t;
files_lock_file(shadow_lock_t)
type updpwd_t;
type updpwd_exec_t;
domain_type(updpwd_t)