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su: add tunable to control user exec domain access

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Signed-off-by: Kenton Groombridge <me@concord.sh>
This commit is contained in:
Kenton Groombridge 2021-08-08 17:35:23 -04:00
parent 94f6d5d9c5
commit 580248ee48
2 changed files with 38 additions and 12 deletions
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40
policy/modules/admin/su.if
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@ -150,8 +150,6 @@ template(`su_role_template',`
domain_interactive_fd($1_su_t)
role $4 types $1_su_t;
allow $2 $1_su_t:process signal;
allow $1_su_t self:capability { audit_control audit_write chown dac_override fowner net_bind_service setgid setuid sys_nice sys_resource };
dontaudit $1_su_t self:capability { net_admin sys_tty_config };
allow $1_su_t self:process { setexec setsched setrlimit };
@ -159,18 +157,8 @@ template(`su_role_template',`
allow $1_su_t self:netlink_audit_socket { nlmsg_relay create_netlink_socket_perms };
allow $1_su_t self:key { search write };
allow $1_su_t $2:key search;
# Transition from the user domain to this domain.
domtrans_pattern($2, su_exec_t, $1_su_t)
ps_process_pattern($2, $1_su_t)
# By default, revert to the calling domain when a shell is executed.
corecmd_shell_domtrans($1_su_t, $2)
allow $2 $1_su_t:fd use;
allow $2 $1_su_t:fifo_file rw_inherited_fifo_file_perms;
allow $2 $1_su_t:process sigchld;
kernel_read_system_state($1_su_t)
kernel_read_kernel_sysctls($1_su_t)
@ -229,6 +217,34 @@ template(`su_role_template',`
auth_use_pam_systemd($1_su_t)
')
tunable_policy(`su_allow_user_exec_domains',`
allow $3 $1_su_t:process signal;
allow $1_su_t $3:key search;
# Transition from the user domain to this domain.
domtrans_pattern($3, su_exec_t, $1_su_t)
ps_process_pattern($3, $1_su_t)
allow $3 $1_su_t:fd use;
allow $3 $1_su_t:fifo_file rw_inherited_fifo_file_perms;
allow $3 $1_su_t:process sigchld;
',`
allow $2 $1_su_t:process signal;
allow $1_su_t $2:key search;
# Transition from the user domain to this domain.
domtrans_pattern($2, su_exec_t, $1_su_t)
ps_process_pattern($2, $1_su_t)
allow $2 $1_su_t:fd use;
allow $2 $1_su_t:fifo_file rw_inherited_fifo_file_perms;
allow $2 $1_su_t:process sigchld;
')
tunable_policy(`allow_polyinstantiation',`
fs_mount_xattr_fs($1_su_t)
fs_unmount_xattr_fs($1_su_t)

10
policy/modules/admin/su.te
View File

@ -1,5 +1,15 @@
policy_module(su, 1.16.0)
## <desc>
## <p>
## Determine whether the user application
## exec domain attribute should be respected
## for su access. If not enabled, only user
## domains themselves may use su.
## </p>
## </desc>
gen_tunable(su_allow_user_exec_domains, false)
########################################
#
# Declarations