0243e5cf4f
Remove system server's permission to dynamically update SELinux policy on the device. 1) This functionality has never been used, so we have no idea if it works or not. 2) If system_server is compromised, this functionality allows a complete bypass of the SELinux policy on the device. In particular, an attacker can force a regression of the following patch * https://android-review.googlesource.com/138510 see also https://code.google.com/p/android/issues/detail?id=181826 3) Dynamic policy update can be used to bypass neverallow protections enforced in CTS, by pushing a policy to the device after certification. Such an updated policy could bring the device out of compliance or deliberately introduce security weaknesses. Bug: 22885422 Bug: 8949824 Change-Id: I3c64d64359060561102e1587531836b69cfeef00
359 lines
11 KiB
Text
359 lines
11 KiB
Text
#####################################
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# domain_trans(olddomain, type, newdomain)
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# Allow a transition from olddomain to newdomain
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# upon executing a file labeled with type.
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# This only allows the transition; it does not
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# cause it to occur automatically - use domain_auto_trans
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# if that is what you want.
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#
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define(`domain_trans', `
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# Old domain may exec the file and transition to the new domain.
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allow $1 $2:file { getattr open read execute };
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allow $1 $3:process transition;
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# New domain is entered by executing the file.
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allow $3 $2:file { entrypoint open read execute getattr };
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# New domain can send SIGCHLD to its caller.
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allow $3 $1:process sigchld;
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# Enable AT_SECURE, i.e. libc secure mode.
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dontaudit $1 $3:process noatsecure;
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# XXX dontaudit candidate but requires further study.
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allow $1 $3:process { siginh rlimitinh };
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')
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#####################################
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# domain_auto_trans(olddomain, type, newdomain)
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# Automatically transition from olddomain to newdomain
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# upon executing a file labeled with type.
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#
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define(`domain_auto_trans', `
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# Allow the necessary permissions.
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domain_trans($1,$2,$3)
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# Make the transition occur by default.
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type_transition $1 $2:process $3;
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')
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#####################################
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# file_type_trans(domain, dir_type, file_type)
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# Allow domain to create a file labeled file_type in a
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# directory labeled dir_type.
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# This only allows the transition; it does not
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# cause it to occur automatically - use file_type_auto_trans
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# if that is what you want.
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#
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define(`file_type_trans', `
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# Allow the domain to add entries to the directory.
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allow $1 $2:dir ra_dir_perms;
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# Allow the domain to create the file.
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allow $1 $3:notdevfile_class_set create_file_perms;
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allow $1 $3:dir create_dir_perms;
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')
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#####################################
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# file_type_auto_trans(domain, dir_type, file_type)
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# Automatically label new files with file_type when
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# they are created by domain in directories labeled dir_type.
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#
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define(`file_type_auto_trans', `
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# Allow the necessary permissions.
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file_type_trans($1, $2, $3)
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# Make the transition occur by default.
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type_transition $1 $2:dir $3;
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type_transition $1 $2:notdevfile_class_set $3;
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')
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#####################################
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# r_dir_file(domain, type)
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# Allow the specified domain to read directories, files
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# and symbolic links of the specified type.
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define(`r_dir_file', `
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allow $1 $2:dir r_dir_perms;
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allow $1 $2:{ file lnk_file } r_file_perms;
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')
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#####################################
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# tmpfs_domain(domain)
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# Define and allow access to a unique type for
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# this domain when creating tmpfs / shmem / ashmem files.
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define(`tmpfs_domain', `
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type $1_tmpfs, file_type;
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type_transition $1 tmpfs:file $1_tmpfs;
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allow $1 $1_tmpfs:file { read write };
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')
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#####################################
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# init_daemon_domain(domain)
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# Set up a transition from init to the daemon domain
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# upon executing its binary.
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define(`init_daemon_domain', `
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domain_auto_trans(init, $1_exec, $1)
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tmpfs_domain($1)
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')
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#####################################
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# app_domain(domain)
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# Allow a base set of permissions required for all apps.
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define(`app_domain', `
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typeattribute $1 appdomain;
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# Label ashmem objects with our own unique type.
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tmpfs_domain($1)
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# Map with PROT_EXEC.
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allow $1 $1_tmpfs:file execute;
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')
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#####################################
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# net_domain(domain)
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# Allow a base set of permissions required for network access.
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define(`net_domain', `
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typeattribute $1 netdomain;
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')
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#####################################
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# bluetooth_domain(domain)
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# Allow a base set of permissions required for bluetooth access.
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define(`bluetooth_domain', `
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typeattribute $1 bluetoothdomain;
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')
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#####################################
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# unix_socket_connect(clientdomain, socket, serverdomain)
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# Allow a local socket connection from clientdomain via
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# socket to serverdomain.
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#
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# Note: If you see denial records that distill to the
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# following allow rules:
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# allow clientdomain property_socket:sock_file write;
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# allow clientdomain init:unix_stream_socket connectto;
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# allow clientdomain something_prop:property_service set;
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#
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# This sequence is indicative of attempting to set a property.
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# use set_prop(sourcedomain, targetproperty)
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#
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define(`unix_socket_connect', `
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ifelse($2, `property', `
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ifelse($3,`init', `
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print(`deprecated: unix_socket_connect($1, $2, $3) Please use set_prop($1, <property name>) instead.')
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')
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')
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__unix_socket_connect__($1, $2, $3)
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')
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define(`__unix_socket_connect__', `
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allow $1 $2_socket:sock_file write;
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allow $1 $3:unix_stream_socket connectto;
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')
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#####################################
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# set_prop(sourcedomain, targetproperty)
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# Allows source domain to set the
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# targetproperty.
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#
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define(`set_prop', `
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__unix_socket_connect__($1, property, init)
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allow $1 $2:property_service set;
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')
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#####################################
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# unix_socket_send(clientdomain, socket, serverdomain)
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# Allow a local socket send from clientdomain via
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# socket to serverdomain.
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define(`unix_socket_send', `
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allow $1 $2_socket:sock_file write;
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allow $1 $3:unix_dgram_socket sendto;
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')
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#####################################
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# binder_use(domain)
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# Allow domain to use Binder IPC.
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define(`binder_use', `
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# Call the servicemanager and transfer references to it.
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allow $1 servicemanager:binder { call transfer };
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# servicemanager performs getpidcon on clients.
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allow servicemanager $1:dir search;
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allow servicemanager $1:file { read open };
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allow servicemanager $1:process getattr;
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# rw access to /dev/binder and /dev/ashmem is presently granted to
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# all domains in domain.te.
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')
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#####################################
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# binder_call(clientdomain, serverdomain)
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# Allow clientdomain to perform binder IPC to serverdomain.
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define(`binder_call', `
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# Call the server domain and optionally transfer references to it.
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allow $1 $2:binder { call transfer };
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# Allow the serverdomain to transfer references to the client on the reply.
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allow $2 $1:binder transfer;
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# Receive and use open files from the server.
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allow $1 $2:fd use;
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')
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#####################################
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# binder_service(domain)
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# Mark a domain as being a Binder service domain.
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# Used to allow binder IPC to the various system services.
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define(`binder_service', `
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typeattribute $1 binderservicedomain;
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')
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#####################################
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# wakelock_use(domain)
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# Allow domain to manage wake locks
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define(`wakelock_use', `
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# Access /sys/power/wake_lock and /sys/power/wake_unlock
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allow $1 sysfs_wake_lock:file rw_file_perms;
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# Accessing these files requires CAP_BLOCK_SUSPEND
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allow $1 self:capability2 block_suspend;
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')
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#####################################
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# selinux_check_access(domain)
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# Allow domain to check SELinux permissions via selinuxfs.
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define(`selinux_check_access', `
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allow $1 selinuxfs:file rw_file_perms;
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allow $1 kernel:security compute_av;
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allow $1 self:netlink_selinux_socket *;
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')
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#####################################
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# selinux_check_context(domain)
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# Allow domain to check SELinux contexts via selinuxfs.
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define(`selinux_check_context', `
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allow $1 selinuxfs:file rw_file_perms;
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allow $1 kernel:security check_context;
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')
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#####################################
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# selinux_setenforce(domain)
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# Allow domain to set SELinux to enforcing.
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define(`selinux_setenforce', `
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allow $1 selinuxfs:file rw_file_perms;
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allow $1 kernel:security setenforce;
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')
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#####################################
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# selinux_setbool(domain)
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# Allow domain to set SELinux booleans.
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define(`selinux_setbool', `
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allow $1 selinuxfs:file rw_file_perms;
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allow $1 kernel:security setbool;
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')
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#####################################
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# security_access_policy(domain)
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# Read only access to all policy files and
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# selinuxfs
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define(`security_access_policy', `
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allow $1 security_file:dir r_dir_perms;
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allow $1 security_file:file r_file_perms;
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')
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#####################################
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# mmac_manage_policy(domain)
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# Ability to manage mmac policy files,
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# trigger runtime reload, change
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# mmac enforcing mode and access logcat.
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define(`mmac_manage_policy', `
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allow $1 security_file:dir create_dir_perms;
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allow $1 security_file:file create_file_perms;
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allow $1 security_file:lnk_file { create rename unlink };
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set_prop($1, security_prop)
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')
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#####################################
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# access_kmsg(domain)
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# Ability to read from kernel logs
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# and execute the klogctl syscall
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# in a non destructive manner. See
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# man 2 klogctl
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define(`access_kmsg', `
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allow $1 kernel:system syslog_read;
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')
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#####################################
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# create_pty(domain)
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# Allow domain to create and use a pty, isolated from any other domain ptys.
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define(`create_pty', `
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# Each domain gets a unique devpts type.
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type $1_devpts, fs_type;
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# Label the pty with the unique type when created.
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type_transition $1 devpts:chr_file $1_devpts;
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# Allow use of the pty after creation.
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allow $1 $1_devpts:chr_file { open getattr read write ioctl };
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# Note: devpts:dir search and ptmx_device:chr_file rw_file_perms
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# allowed to everyone via domain.te.
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')
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#####################################
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# Non system_app application set
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#
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define(`non_system_app_set', `{ appdomain -system_app }')
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#####################################
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# Recovery only
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# SELinux rules which apply only to recovery mode
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#
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define(`recovery_only', ifelse(target_recovery, `true', $1, ))
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#####################################
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# Userdebug or eng builds
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# SELinux rules which apply only to userdebug or eng builds
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#
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define(`userdebug_or_eng', ifelse(target_build_variant, `eng', $1, ifelse(target_build_variant, `userdebug', $1)))
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define(`eng', ifelse(target_build_variant, `eng', $1))
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#####################################
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# write_logd(domain)
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# Ability to write to android log
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# daemon via sockets
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define(`write_logd', `
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unix_socket_send($1, logdw, logd)
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allow $1 pmsg_device:chr_file w_file_perms;
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')
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#####################################
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# read_logd(domain)
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# Ability to run logcat and read from android
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# log daemon via sockets
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define(`read_logd', `
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allow $1 logcat_exec:file rx_file_perms;
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unix_socket_connect($1, logdr, logd)
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')
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#####################################
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# control_logd(domain)
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# Ability to control
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# android log daemon via sockets
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define(`control_logd', `
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# Group AID_LOG checked by filesystem & logd
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# to permit control commands
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unix_socket_connect($1, logd, logd)
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')
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#####################################
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# use_keystore(domain)
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# Ability to use keystore.
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# Keystore is requires the following permissions
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# to call getpidcon.
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define(`use_keystore', `
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allow keystore $1:dir search;
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allow keystore $1:file { read open };
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allow keystore $1:process getattr;
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allow $1 keystore_service:service_manager find;
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binder_call($1, keystore)
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')
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###########################################
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# use_drmservice(domain)
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# Ability to use DrmService which requires
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# DrmService to call getpidcon.
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define(`use_drmservice', `
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allow drmserver $1:dir search;
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allow drmserver $1:file { read open };
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allow drmserver $1:process getattr;
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')
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##########################################
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# print a message with a trailing newline
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# print(`args')
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define(`print', `errprint(`m4: '__file__: __line__`: $*
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')')
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