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// Copyright 2024 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
pub mod permission_check;
pub mod policy;
pub mod security_server;
pub use security_server::SecurityServer;
mod access_vector_cache;
mod sync;
use policy::arrays::FsUseType;
use std::num::NonZeroU32;
/// The Security ID (SID) used internally to refer to a security context.
#[derive(Copy, Clone, Debug, Eq, Hash, PartialEq)]
pub struct SecurityId(NonZeroU32);
impl SecurityId {
/// Returns a `SecurityId` encoding the specified initial Security Context.
/// These are used when labeling kernel resources created before policy
/// load, allowing the policy to determine the Security Context to use.
pub fn initial(initial_sid: InitialSid) -> Self {
Self(NonZeroU32::new(initial_sid as u32).unwrap())
}
}
/// A class that may appear in SELinux policy or an access vector cache query.
#[derive(Clone, Debug, PartialEq)]
pub enum AbstractObjectClass {
Unspecified,
/// A well-known class used in the SELinux system, such as `process` or `file`.
System(ObjectClass),
/// A custom class that only has meaning in policies that define class with the given string
/// name.
Custom(String),
}
impl Default for AbstractObjectClass {
fn default() -> Self {
Self::Unspecified
}
}
/// Declares an `enum` and implements an `all_variants()` API for it.
macro_rules! enumerable_enum {
($(#[$meta:meta])* $name:ident $(extends $common_name:ident)? {
$($(#[$variant_meta:meta])* $variant:ident,)*
}) => {
$(#[$meta])*
pub enum $name {
$($(#[$variant_meta])* $variant,)*
$(Common($common_name),)?
}
impl $name {
pub fn all_variants() -> Vec<Self> {
let all_variants = vec![$($name::$variant),*];
$(let mut all_variants = all_variants; all_variants.extend($common_name::all_variants().into_iter().map(Self::Common));)?
all_variants
}
}
}
}
enumerable_enum! {
/// A well-known class in SELinux policy that has a particular meaning in policy enforcement
/// hooks.
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
ObjectClass {
// keep-sorted start
/// The SELinux "blk_file" object class.
Block,
/// The SELinux "chr_file" object class.
Character,
/// The SELinux "dir" object class.
Dir,
/// The SELinux "fifo_file" object class.
Fifo,
/// The SELinux "file" object class.
File,
/// The SELinux "filesystem" object class.
FileSystem,
/// The SELinux "lnk_file" object class.
Link,
/// The SELinux "process" object class.
Process,
/// The SELinux "security" object class.
Security,
/// The SELinux "sock_file" object class.
Socket,
// keep-sorted end
}
}
impl ObjectClass {
/// Returns the name used to refer to this object class in the SELinux binary policy.
pub fn name(&self) -> &'static str {
match self {
// keep-sorted start
Self::Block => "blk_file",
Self::Character => "chr_file",
Self::Dir => "dir",
Self::Fifo => "fifo_file",
Self::File => "file",
Self::FileSystem => "filesystem",
Self::Link => "lnk_file",
Self::Process => "process",
Self::Security => "security",
Self::Socket => "sock_file",
// keep-sorted end
}
}
}
impl From<ObjectClass> for AbstractObjectClass {
fn from(object_class: ObjectClass) -> Self {
Self::System(object_class)
}
}
impl From<String> for AbstractObjectClass {
fn from(name: String) -> Self {
Self::Custom(name)
}
}
enumerable_enum! {
/// A well-known file-like class in SELinux policy that has a particular meaning in policy
/// enforcement hooks.
#[derive(Copy, Clone, Debug, Eq, Hash, PartialEq)]
FileClass {
// keep-sorted start
/// The SELinux "blk_file" object class.
Block,
/// The SELinux "chr_file" object class.
Character,
/// The SELinux "dir" object class.
Dir,
/// The SELinux "fifo_file" object class.
Fifo,
/// The SELinux "file" object class.
File,
/// The SELinux "lnk_file" object class.
Link,
/// The SELinux "sock_file" object class.
Socket,
// keep-sorted end
}
}
impl From<FileClass> for ObjectClass {
fn from(file_class: FileClass) -> Self {
match file_class {
// keep-sorted start
FileClass::Block => Self::Block,
FileClass::Character => Self::Character,
FileClass::Dir => Self::Dir,
FileClass::Fifo => Self::Fifo,
FileClass::File => Self::File,
FileClass::Link => Self::Link,
FileClass::Socket => Self::Socket,
// keep-sorted end
}
}
}
/// A permission that may appear in SELinux policy or an access vector cache query.
#[derive(Clone, Debug, PartialEq)]
pub enum AbstractPermission {
/// A permission that is interpreted directly by the system. These are kernel objects such as
/// a "process", "file", etc.
System(Permission),
/// A permission with an arbitrary string identifier.
Custom { class: AbstractObjectClass, permission: String },
}
impl AbstractPermission {
pub fn new_custom(class: AbstractObjectClass, permission: String) -> Self {
Self::Custom { class, permission }
}
}
impl From<Permission> for AbstractPermission {
fn from(permission: Permission) -> Self {
Self::System(permission)
}
}
pub trait ClassPermission {
fn class(&self) -> ObjectClass;
}
macro_rules! permission_enum {
($(#[$meta:meta])* $name:ident {
$($(#[$variant_meta:meta])* $variant:ident($inner:ident)),*,
}) => {
$(#[$meta])*
pub enum $name {
$($(#[$variant_meta])* $variant($inner)),*
}
$(impl From<$inner> for $name {
fn from(v: $inner) -> Self {
Self::$variant(v)
}
})*
impl ClassPermission for $name {
fn class(&self) -> ObjectClass {
match self {
$($name::$variant(_) => ObjectClass::$variant),*
}
}
}
impl $name {
pub fn name(&self) -> &'static str {
match self {
$($name::$variant(v) => v.name()),*
}
}
pub fn all_variants() -> Vec<Self> {
let mut all_variants = vec![];
$(all_variants.extend($inner::all_variants().into_iter().map($name::from));)*
all_variants
}
}
}
}
permission_enum! {
/// A well-known `(class, permission)` pair in SELinux policy that has a particular meaning in
/// policy enforcement hooks.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
Permission {
// keep-sorted start
/// Permissions for the well-known SELinux "blk_file" file-like object class.
Block(BlockFilePermission),
/// Permissions for the well-known SELinux "chr_file" file-like object class.
Character(CharacterFilePermission),
/// Permissions for the well-known SELinux "dir" file-like object class.
Dir(DirPermission),
/// Permissions for the well-known SELinux "fifo_file" file-like object class.
Fifo(FifoFilePermission),
/// Permissions for the well-known SELinux "file" object class.
File(FilePermission),
/// Permissions for the well-known SELinux "filesystem" object class.
FileSystem(FileSystemPermission),
/// Permissions for the well-known SELinux "lnk_file" file-like object class.
Link(LinkFilePermission),
/// Permissions for the well-known SELinux "process" object class.
Process(ProcessPermission),
/// Permissions for access to parts of the "selinuxfs" used to administer and query SELinux.
Security(SecurityPermission),
/// Permissions for the well-known SELinux "sock_file" file-like object class.
Socket(SocketPermission),
// keep-sorted end
}
}
/// Helper used to define an enum of permission values, with specified names.
/// Uses of this macro should not rely on "extends", which is solely for use to express permission
/// inheritance in `class_permission_enum`.
macro_rules! common_permission_enum {
($(#[$meta:meta])* $name:ident $(extends $common_name:ident)? {
$($(#[$variant_meta:meta])* $variant:ident ($variant_name:literal),)*
}) => {
enumerable_enum! {
$(#[$meta])* $name $(extends $common_name)? {
$($(#[$variant_meta])* $variant,)*
}
}
impl $name {
fn name(&self) -> &'static str {
match self {
$($name::$variant => $variant_name,)*
$(Self::Common(v) => {let v:$common_name = v.clone(); v.name()},)?
}
}
}
}
}
/// Helper used to declare the set of named permissions associated with an SELinux class.
/// The `ClassType` trait is implemented on the declared `enum`, enabling values to be wrapped into
/// the generic `Permission` container.
/// If an "extends" type is specified then a `Common` enum case is added, encapsulating the values
/// of that underlying permission type. This is used to represent e.g. SELinux "dir" class deriving
/// a basic set of permissions from the common "file" symbol.
macro_rules! class_permission_enum {
($(#[$meta:meta])* $name:ident $(extends $common_name:ident)? {
$($(#[$variant_meta:meta])* $variant:ident ($variant_name:literal),)*
}) => {
common_permission_enum! {
$(#[$meta])* $name $(extends $common_name)? {
$($(#[$variant_meta])* $variant ($variant_name),)*
}
}
impl ClassPermission for $name {
fn class(&self) -> ObjectClass {
Permission::from(self.clone()).class()
}
}
}
}
common_permission_enum! {
/// Permissions common to all file-like object classes (e.g. "lnk_file", "dir"). These are
/// combined with a specific `FileClass` by policy enforcement hooks, to obtain class-affine
/// permission values to check.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
CommonFilePermission {
// keep-sorted start
/// Permission to create a file.
Create("create"),
/// Permission to query attributes, including uid, gid and extended attributes.
GetAttr("getattr"),
/// Permissions to create hard link.
Link("link"),
/// Permission to open a file.
Open("open"),
/// Permission to modify attributes, including uid, gid and extended attributes.
SetAttr("setattr"),
/// Permission to delete a file or remove a hard link.
Unlink("unlink"),
// keep-sorted end
}
}
impl CommonFilePermission {
/// Returns the `class`-affine `Permission` value corresponding to this common permission.
/// This is used to allow hooks to resolve e.g. common "read" permission access based on the
/// "allow" rules for the correct target object class.
pub fn for_class(&self, class: FileClass) -> Permission {
match class {
FileClass::Block => BlockFilePermission::Common(self.clone()).into(),
FileClass::Character => CharacterFilePermission::Common(self.clone()).into(),
FileClass::Dir => DirPermission::Common(self.clone()).into(),
FileClass::Fifo => FifoFilePermission::Common(self.clone()).into(),
FileClass::File => FilePermission::Common(self.clone()).into(),
FileClass::Link => LinkFilePermission::Common(self.clone()).into(),
FileClass::Socket => SocketPermission::Common(self.clone()).into(),
}
}
}
class_permission_enum! {
/// A well-known "blk_file" class permission in SELinux policy that has a particular meaning in
/// policy enforcement hooks.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
BlockFilePermission extends CommonFilePermission {
}
}
class_permission_enum! {
/// A well-known "chr_file" class permission in SELinux policy that has a particular meaning in
/// policy enforcement hooks.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
CharacterFilePermission extends CommonFilePermission {
}
}
class_permission_enum! {
/// A well-known "dir" class permission in SELinux policy that has a particular meaning in
/// policy enforcement hooks.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
DirPermission extends CommonFilePermission {
// keep-sorted start
/// Permission to add a file to the directory.
AddName("add_name"),
/// Permission to remove a directory.
RemoveDir("rmdir"),
/// Permission to remove an entry from a directory.
RemoveName("remove_name"),
/// Search access to the directory.
Search("search"),
// keep-sorted end
}
}
class_permission_enum! {
/// A well-known "fifo_file" class permission in SELinux policy that has a particular meaning in
/// policy enforcement hooks.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
FifoFilePermission extends CommonFilePermission {
}
}
class_permission_enum! {
/// A well-known "file" class permission in SELinux policy that has a particular meaning in
/// policy enforcement hooks.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
FilePermission extends CommonFilePermission {
// keep-sorted start
/// Permission to use a file as an entry point into the new domain on transition.
Entrypoint("entrypoint"),
/// Permission to use a file as an entry point to the calling domain without performing a
/// transition.
ExecuteNoTrans("execute_no_trans"),
// keep-sorted end
}
}
class_permission_enum! {
/// A well-known "filesystem" class permission in SELinux policy that has a particular meaning in
/// policy enforcement hooks.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
FileSystemPermission {
// keep-sorted start
/// Permission to associate a file to the filesystem.
Associate("associate"),
// keep-sorted end
}
}
class_permission_enum! {
/// A well-known "lnk_file" class permission in SELinux policy that has a particular meaning in
/// policy enforcement hooks.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
LinkFilePermission extends CommonFilePermission {
}
}
class_permission_enum! {
/// A well-known "process" class permission in SELinux policy that has a particular meaning in
/// policy enforcement hooks.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
ProcessPermission {
// keep-sorted start
/// Permission to dynamically transition a process to a different security domain.
DynTransition("dyntransition"),
/// Permission to fork the current running process.
Fork("fork"),
/// Permission to get the process group ID.
GetPgid("getpgid"),
/// Permission to get the resource limits on a process.
GetRlimit("getrlimit"),
/// Permission to get scheduling policy currently applied to a process.
GetSched("getsched"),
/// Permission to get the session ID.
GetSession("getsession"),
/// Permission to trace a process.
Ptrace("ptrace"),
/// Permission to set the calling task's current Security Context.
/// The "dyntransition" permission separately limits which Contexts "setcurrent" may be used to transition to.
SetCurrent("setcurrent"),
/// Permission to set the Security Context used by `exec()`.
SetExec("setexec"),
/// Permission to set the Security Context used when creating filesystem objects.
SetFsCreate("setfscreate"),
/// Permission to set the Security Context used when creating kernel keyrings.
SetKeyCreate("setkeycreate"),
/// Permission to set the process group ID.
SetPgid("setpgid"),
/// Permission to set the resource limits on a process.
SetRlimit("setrlimit"),
/// Permission to set scheduling policy for a process.
SetSched("setsched"),
/// Permission to set the Security Context used when creating new labeled sockets.
SetSockCreate("setsockcreate"),
/// Permission to send SIGCHLD to a process.
SigChld("sigchld"),
/// Permission to send SIGKILL to a process.
SigKill("sigkill"),
/// Permission to send SIGSTOP to a process.
SigStop("sigstop"),
/// Permission to send a signal other than SIGKILL, SIGSTOP, or SIGCHLD to a process.
Signal("signal"),
/// Permission to transition to a different security domain.
Transition("transition"),
// keep-sorted end
}
}
class_permission_enum! {
/// A well-known "security" class permission in SELinux policy, used to control access to
/// sensitive administrative and query API surfaces in the "selinuxfs".
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
SecurityPermission {
// keep-sorted start
/// Permission to validate Security Context using the "context" API.
CheckContext("check_context"),
/// Permission to compute access vectors via the "access" API.
ComputeAv("compute_av"),
/// Permission to compute security contexts for newly created objects via "create".
ComputeCreate("compute_create"),
/// Permission to load a new binary policy into the kernel via the "load" API.
LoadPolicy("load_policy"),
/// Permission to commit booleans to control conditional elements of the policy.
SetBool("setbool"),
/// Permission to change the way permissions are validated for `mmap()` operations.
SetCheckReqProt("setcheckreqprot"),
/// Permission to switch the system between permissive and enforcing modes, via "enforce".
SetEnforce("setenforce"),
// keep-sorted end
}
}
class_permission_enum! {
/// A well-known "sock_file" class permission in SELinux policy that has a particular meaning in
/// policy enforcement hooks.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
SocketPermission extends CommonFilePermission {
}
}
/// Initial Security Identifier (SID) values defined by the SELinux Reference Policy.
/// Where the SELinux Reference Policy retains definitions for some deprecated initial SIDs, this
/// enum omits deprecated entries for clarity.
#[repr(u64)]
enum ReferenceInitialSid {
Kernel = 1,
_Security = 2,
Unlabeled = 3,
_Fs = 4,
File = 5,
_AnySocket = 6,
_Port = 7,
_Netif = 8,
_Netmsg = 9,
_Node = 10,
_Sysctl = 15,
_Devnull = 25,
FirstUnused,
}
/// Lowest Security Identifier value guaranteed not to be used by this
/// implementation to refer to an initial Security Context.
pub const FIRST_UNUSED_SID: u32 = ReferenceInitialSid::FirstUnused as u32;
macro_rules! initial_sid_enum {
($(#[$meta:meta])* $name:ident {
$($(#[$variant_meta:meta])* $variant:ident ($variant_name: literal)),*,
}) => {
$(#[$meta])*
pub enum $name {
$($(#[$variant_meta])* $variant = ReferenceInitialSid::$variant as isize),*
}
impl $name {
pub fn all_variants() -> Vec<Self> {
vec![
$($name::$variant),*
]
}
pub fn name(&self) -> &'static str {
match self {
$($name::$variant => $variant_name),*
}
}
}
}
}
initial_sid_enum! {
/// Initial Security Identifier (SID) values actually used by this implementation.
/// These must be present in the policy, for it to be valid.
#[derive(Copy, Clone, Debug, Eq, Hash, PartialEq)]
InitialSid {
// keep-sorted start
File("file"),
Kernel("kernel"),
Unlabeled("unlabeled"),
// keep-sorted end
}
}
/// A borrowed byte slice that contains no `NUL` characters by truncating the input slice at the
/// first `NUL` (if any) upon construction.
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct NullessByteStr<'a>(&'a [u8]);
impl<'a> NullessByteStr<'a> {
/// Returns a non-null-terminated representation of the security context string.
pub fn as_bytes(&self) -> &[u8] {
&self.0
}
}
impl<'a, S: AsRef<[u8]> + ?Sized> From<&'a S> for NullessByteStr<'a> {
/// Any `AsRef<[u8]>` can be processed into a [`NullessByteStr`]. The [`NullessByteStr`] will
/// retain everything up to (but not including) a null character, or else the complete byte
/// string.
fn from(s: &'a S) -> Self {
let value = s.as_ref();
match value.iter().position(|c| *c == 0) {
Some(end) => Self(&value[..end]),
None => Self(value),
}
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct FileSystemLabel {
pub sid: SecurityId,
pub scheme: FileSystemLabelingScheme,
}
#[derive(Clone, Debug, PartialEq)]
pub enum FileSystemLabelingScheme {
/// This filesystem was mounted with "context=".
Mountpoint,
/// This filesystem has an "fs_use_xattr", "fs_use_task", or "fs_use_trans" entry in the
/// policy. `root_sid` identifies the context for the root of the filesystem and `def_sid`
/// identifies the context to use for unlabeled files in the filesystem (the "default
/// context").
FsUse { fs_use_type: FsUseType, def_sid: SecurityId, root_sid: SecurityId },
/// This filesystem has one or more "genfscon" statements associated with it in the policy.
GenFsCon,
}
/// SELinux security context-related filesystem mount options. These options are documented in the
/// `context=context, fscontext=context, defcontext=context, and rootcontext=context` section of
/// the `mount(8)` manpage.
#[derive(Clone, Debug, PartialEq)]
pub struct FileSystemMountOptions {
/// Specifies the effective security context to use for all nodes in the filesystem, and the
/// filesystem itself. If the filesystem already contains security attributes then these are
/// ignored. May not be combined with any of the other options.
pub context: Option<Vec<u8>>,
/// Specifies an effective security context to use for un-labeled nodes in the filesystem,
/// rather than falling-back to the policy-defined "file" context.
pub def_context: Option<Vec<u8>>,
/// The value of the `fscontext=[security-context]` mount option. This option is used to
/// label the filesystem (superblock) itself.
pub fs_context: Option<Vec<u8>>,
/// The value of the `rootcontext=[security-context]` mount option. This option is used to
/// (re)label the inode located at the filesystem mountpoint.
pub root_context: Option<Vec<u8>>,
}
/// Status information parameter for the [`SeLinuxStatusPublisher`] interface.
pub struct SeLinuxStatus {
/// SELinux-wide enforcing vs. permissive mode bit.
pub is_enforcing: bool,
/// Number of times the policy has been changed since SELinux started.
pub change_count: u32,
/// Bit indicating whether operations unknown SELinux abstractions will be denied.
pub deny_unknown: bool,
}
/// Interface for security server to interact with selinuxfs status file.
pub trait SeLinuxStatusPublisher: Send {
/// Sets the value part of the associated selinuxfs status file.
fn set_status(&mut self, policy_status: SeLinuxStatus);
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn object_class_permissions() {
assert_eq!(AbstractObjectClass::Unspecified, AbstractObjectClass::default());
assert_eq!(
AbstractObjectClass::Custom(String::from("my_class")),
String::from("my_class").into()
);
for variant in ProcessPermission::all_variants().into_iter() {
assert_eq!(ObjectClass::Process, variant.class());
assert_eq!("process", variant.class().name());
let permission: Permission = variant.clone().into();
assert_eq!(Permission::Process(variant.clone()), permission);
assert_eq!(
AbstractPermission::System(Permission::Process(variant.clone())),
permission.into()
);
assert_eq!(AbstractObjectClass::System(ObjectClass::Process), variant.class().into());
}
}
#[test]
fn nulless_byte_str_equivalence() {
let unterminated: NullessByteStr<'_> = b"u:object_r:test_valid_t:s0".into();
let nul_terminated: NullessByteStr<'_> = b"u:object_r:test_valid_t:s0\0".into();
let nul_containing: NullessByteStr<'_> =
b"u:object_r:test_valid_t:s0\0IGNORE THIS\0!\0".into();
for context in [nul_terminated, nul_containing] {
assert_eq!(unterminated, context);
assert_eq!(unterminated.as_bytes(), context.as_bytes());
}
}
}