mirror of
https://github.com/topjohnwu/Magisk.git
synced 2026-01-03 16:28:52 -08:00
608 lines
20 KiB
Rust
608 lines
20 KiB
Rust
use std::fmt::{Display, Formatter, Write};
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use std::io::stderr;
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use std::{iter::Peekable, pin::Pin, vec::IntoIter};
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use base::{error, warn, FmtAdaptor};
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use crate::ffi::Xperm;
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use crate::sepolicy;
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pub enum Token<'a> {
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AL,
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DN,
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AA,
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DA,
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AX,
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AY,
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DX,
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PM,
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EF,
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TA,
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TY,
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AT,
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TT,
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TC,
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TM,
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GF,
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IO,
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LB,
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RB,
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CM,
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ST,
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TL,
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HP,
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HX(u16),
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ID(&'a str),
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}
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type Tokens<'a> = Peekable<IntoIter<Token<'a>>>;
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type ParseResult<'a, T> = Result<T, ParseError<'a>>;
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enum ParseError<'a> {
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General,
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AvtabAv(Token<'a>),
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AvtabXperms(Token<'a>),
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AvtabType(Token<'a>),
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TypeState(Token<'a>),
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TypeAttr,
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TypeTrans,
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NewType,
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NewAttr,
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GenfsCon,
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ShowHelp,
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UnknownAction(Token<'a>),
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}
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macro_rules! throw {
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() => {
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Err(ParseError::General)?
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};
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}
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fn parse_id<'a>(tokens: &mut Tokens<'a>) -> ParseResult<'a, &'a str> {
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match tokens.next() {
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Some(Token::ID(name)) => Ok(name),
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_ => throw!(),
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}
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}
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// names ::= ID(n) { vec![n] };
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// names ::= names(mut v) ID(n) { v.push(n); v };
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// term ::= ID(n) { vec![n] }
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// term ::= LB names(n) RB { n };
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fn parse_term<'a>(tokens: &mut Tokens<'a>) -> ParseResult<'a, Vec<&'a str>> {
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match tokens.next() {
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Some(Token::ID(name)) => Ok(vec![name]),
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Some(Token::LB) => {
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let mut names = Vec::new();
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loop {
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match tokens.next() {
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Some(Token::ID(name)) => names.push(name),
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Some(Token::RB) => break,
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_ => throw!(),
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}
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}
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Ok(names)
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}
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_ => throw!(),
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}
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}
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// names ::= ST { vec![] }
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// names ::= ID(n) { vec![n] };
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// names ::= names(mut v) ID(n) { v.push(n); v };
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// names ::= names(n) ST { vec![] };
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// sterm ::= ST { vec![] }
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// sterm ::= ID(n) { vec![n] }
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// sterm ::= LB names(n) RB { n };
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fn parse_sterm<'a>(tokens: &mut Tokens<'a>) -> ParseResult<'a, Vec<&'a str>> {
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match tokens.next() {
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Some(Token::IO) => Ok(vec!["ioctl"]),
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Some(Token::ID(name)) => Ok(vec![name]),
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Some(Token::ST) => Ok(vec![]),
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Some(Token::LB) => {
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let mut names = Some(Vec::new());
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loop {
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match tokens.next() {
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Some(Token::IO) => {
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if let Some(ref mut names) = names {
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names.push("ioctl")
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}
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}
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Some(Token::ID(name)) => {
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if let Some(ref mut names) = names {
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names.push(name)
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}
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}
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Some(Token::ST) => names = None,
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Some(Token::RB) => break,
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_ => throw!(),
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}
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}
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Ok(names.unwrap_or(vec![]))
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}
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_ => throw!(),
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}
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}
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// xperm ::= HX(low) { Xperm{low, high: low, reset: false} };
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// xperm ::= HX(low) HP HX(high) { Xperm{low, high, reset: false} };
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fn parse_xperm<'a>(tokens: &mut Tokens<'a>) -> ParseResult<'a, Xperm> {
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let low = match tokens.next() {
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Some(Token::HX(low)) => low,
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_ => throw!(),
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};
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let high = match tokens.peek() {
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Some(Token::HP) => {
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tokens.next();
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match tokens.next() {
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Some(Token::HX(high)) => high,
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_ => throw!(),
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}
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}
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_ => low,
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};
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Ok(Xperm {
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low,
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high,
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reset: false,
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})
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}
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// xperms ::= HX(low) { if low > 0 { vec![Xperm{low, high: low, reset: false}] } else { vec![Xperm{low: 0x0000, high: 0xFFFF, reset: true}] }};
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// xperms ::= LB xperm_list(l) RB { l };
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// xperms ::= TL LB xperm_list(mut l) RB { l.iter_mut().for_each(|x| { x.reset = true; }); l };
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// xperms ::= ST { vec![Xperm{low: 0x0000, high: 0xFFFF, reset: false}] };
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//
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// xperm_list ::= xperm(p) { vec![p] }
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// xperm_list ::= xperm_list(mut l) xperm(p) { l.push(p); l }
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fn parse_xperms<'a>(tokens: &mut Tokens<'a>) -> ParseResult<'a, Vec<Xperm>> {
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let mut xperms = Vec::new();
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let reset = match tokens.peek() {
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Some(Token::TL) => {
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tokens.next();
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if !matches!(tokens.peek(), Some(Token::LB)) {
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throw!();
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}
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true
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}
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_ => false,
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};
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match tokens.next() {
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Some(Token::LB) => {
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// parse xperm_list
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loop {
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let mut xperm = parse_xperm(tokens)?;
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xperm.reset = reset;
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xperms.push(xperm);
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if matches!(tokens.peek(), Some(Token::RB)) {
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tokens.next();
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break;
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}
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}
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}
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Some(Token::ST) => {
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xperms.push(Xperm {
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low: 0x0000,
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high: 0xFFFF,
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reset,
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});
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}
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Some(Token::HX(low)) => {
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if low > 0 {
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xperms.push(Xperm {
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low,
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high: low,
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reset,
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});
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} else {
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xperms.push(Xperm {
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low: 0x0000,
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high: 0xFFFF,
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reset,
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});
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}
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}
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_ => throw!(),
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}
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Ok(xperms)
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}
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// statement ::= AL sterm(s) sterm(t) sterm(c) sterm(p) { sepolicy.allow(s, t, c, p); };
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// statement ::= DN sterm(s) sterm(t) sterm(c) sterm(p) { sepolicy.deny(s, t, c, p); };
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// statement ::= AA sterm(s) sterm(t) sterm(c) sterm(p) { sepolicy.auditallow(s, t, c, p); };
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// statement ::= DA sterm(s) sterm(t) sterm(c) sterm(p) { sepolicy.dontaudit(s, t, c, p); };
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// statement ::= AX sterm(s) sterm(t) sterm(c) IO xperms(p) { sepolicy.allowxperm(s, t, c, p); };
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// statement ::= AY sterm(s) sterm(t) sterm(c) IO xperms(p) { sepolicy.auditallowxperm(s, t, c, p); };
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// statement ::= DX sterm(s) sterm(t) sterm(c) IO xperms(p) { sepolicy.dontauditxperm(s, t, c, p); };
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// statement ::= PM sterm(t) { sepolicy.permissive(t); };
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// statement ::= EF sterm(t) { sepolicy.enforce(t); };
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// statement ::= TA term(t) term(a) { sepolicy.typeattribute(t, a); };
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// statement ::= TY ID(t) { sepolicy.type_(t, vec![]);};
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// statement ::= TY ID(t) term(a) { sepolicy.type_(t, a);};
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// statement ::= AT ID(t) { sepolicy.attribute(t); };
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// statement ::= TT ID(s) ID(t) ID(c) ID(d) { sepolicy.type_transition(s, t, c, d, vec![]); };
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// statement ::= TT ID(s) ID(t) ID(c) ID(d) ID(o) { sepolicy.type_transition(s, t, c, d, vec![o]); };
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// statement ::= TC ID(s) ID(t) ID(c) ID(d) { sepolicy.type_change(s, t, c, d); };
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// statement ::= TM ID(s) ID(t) ID(c) ID(d) { sepolicy.type_member(s, t, c, d);};
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// statement ::= GF ID(s) ID(t) ID(c) { sepolicy.genfscon(s, t, c); };
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fn exec_statement<'a>(
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sepolicy: Pin<&mut sepolicy>,
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tokens: &mut Tokens<'a>,
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) -> ParseResult<'a, ()> {
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let action = match tokens.next() {
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Some(token) => token,
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_ => Err(ParseError::ShowHelp)?,
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};
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let check_additional_args = |tokens: &mut Tokens<'a>| {
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if tokens.peek().is_none() {
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Ok(())
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} else {
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Err(ParseError::General)
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}
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};
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match action {
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Token::AL | Token::DN | Token::AA | Token::DA => {
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let result: ParseResult<()> = try {
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let s = parse_sterm(tokens)?;
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let t = parse_sterm(tokens)?;
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let c = parse_sterm(tokens)?;
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let p = parse_sterm(tokens)?;
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check_additional_args(tokens)?;
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match action {
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Token::AL => sepolicy.allow(s, t, c, p),
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Token::DN => sepolicy.deny(s, t, c, p),
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Token::AA => sepolicy.auditallow(s, t, c, p),
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Token::DA => sepolicy.dontaudit(s, t, c, p),
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_ => unreachable!(),
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}
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};
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if result.is_err() {
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Err(ParseError::AvtabAv(action))?
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}
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}
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Token::AX | Token::AY | Token::DX => {
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let result: ParseResult<()> = try {
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let s = parse_sterm(tokens)?;
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let t = parse_sterm(tokens)?;
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let c = parse_sterm(tokens)?;
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let p = if matches!(tokens.next(), Some(Token::IO)) {
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parse_xperms(tokens)?
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} else {
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throw!()
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};
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check_additional_args(tokens)?;
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match action {
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Token::AX => sepolicy.allowxperm(s, t, c, p),
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Token::AY => sepolicy.auditallowxperm(s, t, c, p),
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Token::DX => sepolicy.dontauditxperm(s, t, c, p),
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_ => unreachable!(),
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}
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};
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if result.is_err() {
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Err(ParseError::AvtabXperms(action))?
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}
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}
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Token::PM | Token::EF => {
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let result: ParseResult<()> = try {
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let t = parse_sterm(tokens)?;
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check_additional_args(tokens)?;
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match action {
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Token::PM => sepolicy.permissive(t),
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Token::EF => sepolicy.enforce(t),
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_ => unreachable!(),
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}
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};
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if result.is_err() {
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Err(ParseError::TypeState(action))?
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}
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}
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Token::TA => {
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let result: ParseResult<()> = try {
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let t = parse_term(tokens)?;
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let a = parse_term(tokens)?;
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check_additional_args(tokens)?;
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sepolicy.typeattribute(t, a)
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};
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if result.is_err() {
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Err(ParseError::TypeAttr)?
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}
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}
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Token::TY => {
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let result: ParseResult<()> = try {
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let t = parse_id(tokens)?;
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let a = if tokens.peek().is_none() {
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vec![]
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} else {
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parse_term(tokens)?
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};
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check_additional_args(tokens)?;
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sepolicy.type_(t, a)
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};
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if result.is_err() {
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Err(ParseError::NewType)?
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}
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}
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Token::AT => {
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let result: ParseResult<()> = try {
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let t = parse_id(tokens)?;
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check_additional_args(tokens)?;
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sepolicy.attribute(t)
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};
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if result.is_err() {
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Err(ParseError::NewAttr)?
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}
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}
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Token::TC | Token::TM => {
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let result: ParseResult<()> = try {
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let s = parse_id(tokens)?;
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let t = parse_id(tokens)?;
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let c = parse_id(tokens)?;
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let d = parse_id(tokens)?;
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check_additional_args(tokens)?;
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match action {
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Token::TC => sepolicy.type_change(s, t, c, d),
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Token::TM => sepolicy.type_member(s, t, c, d),
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_ => unreachable!(),
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}
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};
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if result.is_err() {
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Err(ParseError::AvtabType(action))?
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}
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}
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Token::TT => {
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let result: ParseResult<()> = try {
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let s = parse_id(tokens)?;
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let t = parse_id(tokens)?;
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let c = parse_id(tokens)?;
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let d = parse_id(tokens)?;
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let o = if tokens.peek().is_none() {
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""
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} else {
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parse_id(tokens)?
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};
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check_additional_args(tokens)?;
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sepolicy.type_transition(s, t, c, d, o);
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};
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if result.is_err() {
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Err(ParseError::TypeTrans)?
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}
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}
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Token::GF => {
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let result: ParseResult<()> = try {
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let s = parse_id(tokens)?;
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let t = parse_id(tokens)?;
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let c = parse_id(tokens)?;
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check_additional_args(tokens)?;
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sepolicy.genfscon(s, t, c)
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};
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if result.is_err() {
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Err(ParseError::GenfsCon)?
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}
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}
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_ => Err(ParseError::UnknownAction(action))?,
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}
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Ok(())
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}
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fn extract_token<'a>(s: &'a str, tokens: &mut Vec<Token<'a>>) {
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match s {
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"allow" => tokens.push(Token::AL),
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"deny" => tokens.push(Token::DN),
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"auditallow" => tokens.push(Token::AA),
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"dontaudit" => tokens.push(Token::DA),
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"allowxperm" => tokens.push(Token::AX),
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"auditallowxperm" => tokens.push(Token::AY),
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"dontauditxperm" => tokens.push(Token::DX),
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"permissive" => tokens.push(Token::PM),
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"enforce" => tokens.push(Token::EF),
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"typeattribute" => tokens.push(Token::TA),
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"type" => tokens.push(Token::TY),
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"attribute" => tokens.push(Token::AT),
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"type_transition" => tokens.push(Token::TT),
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"type_change" => tokens.push(Token::TC),
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"type_member" => tokens.push(Token::TM),
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"genfscon" => tokens.push(Token::GF),
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"ioctl" => tokens.push(Token::IO),
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"*" => tokens.push(Token::ST),
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"" => {}
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_ => {
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if let Some(idx) = s.find('{') {
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let (a, b) = s.split_at(idx);
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extract_token(a, tokens);
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tokens.push(Token::LB);
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extract_token(&b[1..], tokens);
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} else if let Some(idx) = s.find('}') {
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let (a, b) = s.split_at(idx);
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extract_token(a, tokens);
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tokens.push(Token::RB);
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extract_token(&b[1..], tokens);
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} else if let Some(idx) = s.find(',') {
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let (a, b) = s.split_at(idx);
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extract_token(a, tokens);
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tokens.push(Token::CM);
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extract_token(&b[1..], tokens);
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} else if let Some(idx) = s.find('-') {
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let (a, b) = s.split_at(idx);
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extract_token(a, tokens);
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tokens.push(Token::HP);
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extract_token(&b[1..], tokens);
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} else if let Some(s) = s.strip_prefix('~') {
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tokens.push(Token::TL);
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extract_token(s, tokens);
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} else if let Some(s) = s.strip_prefix("0x") {
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tokens.push(Token::HX(s.parse().unwrap_or(0)));
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} else {
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tokens.push(Token::ID(s));
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}
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}
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}
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}
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fn tokenize_statement(statement: &str) -> Vec<Token> {
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let mut tokens = Vec::new();
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for s in statement.split_whitespace() {
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extract_token(s, &mut tokens);
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}
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tokens
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}
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pub fn parse_statement(sepolicy: Pin<&mut sepolicy>, statement: &str) {
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let statement = statement.trim();
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if statement.is_empty() || statement.starts_with('#') {
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return;
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}
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let mut tokens = tokenize_statement(statement).into_iter().peekable();
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let result = exec_statement(sepolicy, &mut tokens);
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if let Err(e) = result {
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warn!("Syntax error in: \"{}\"", statement);
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error!("Hint: {}", e);
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}
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}
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// Token to string
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impl Display for Token<'_> {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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match self {
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Token::AL => f.write_str("allow"),
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Token::DN => f.write_str("deny"),
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Token::AA => f.write_str("auditallow"),
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Token::DA => f.write_str("dontaudit"),
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Token::AX => f.write_str("allowxperm"),
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Token::AY => f.write_str("auditallowxperm"),
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Token::DX => f.write_str("dontauditxperm"),
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Token::PM => f.write_str("permissive"),
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Token::EF => f.write_str("enforce"),
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Token::TA => f.write_str("typeattribute"),
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Token::TY => f.write_str("type"),
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Token::AT => f.write_str("attribute"),
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Token::TT => f.write_str("type_transition"),
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Token::TC => f.write_str("type_change"),
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Token::TM => f.write_str("type_member"),
|
||
Token::GF => f.write_str("genfscon"),
|
||
Token::IO => f.write_str("ioctl"),
|
||
Token::LB => f.write_char('{'),
|
||
Token::RB => f.write_char('}'),
|
||
Token::CM => f.write_char(','),
|
||
Token::ST => f.write_char('*'),
|
||
Token::TL => f.write_char('~'),
|
||
Token::HP => f.write_char('-'),
|
||
Token::HX(n) => f.write_fmt(format_args!("{:06X}", n)),
|
||
Token::ID(s) => f.write_str(s),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl Display for ParseError<'_> {
|
||
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
|
||
match self {
|
||
ParseError::General => Ok(()),
|
||
ParseError::ShowHelp => format_statement_help(f),
|
||
ParseError::AvtabAv(action) => {
|
||
write!(f, "{action} *source_type *target_type *class *perm_set")
|
||
}
|
||
ParseError::AvtabXperms(action) => {
|
||
write!(
|
||
f,
|
||
"{action} *source_type *target_type *class operation xperm_set"
|
||
)
|
||
}
|
||
ParseError::AvtabType(action) => {
|
||
write!(f, "{action} source_type target_type class default_type")
|
||
}
|
||
ParseError::TypeState(action) => {
|
||
write!(f, "{action} *type")
|
||
}
|
||
ParseError::TypeAttr => f.write_str("typeattribute ^type ^attribute"),
|
||
ParseError::TypeTrans => f.write_str(
|
||
"type_transition source_type target_type class default_type (object_name)",
|
||
),
|
||
ParseError::NewType => f.write_str("type type_name ^(attribute)"),
|
||
ParseError::NewAttr => f.write_str("attribute attribute_name"),
|
||
ParseError::GenfsCon => f.write_str("genfscon fs_name partial_path fs_context"),
|
||
ParseError::UnknownAction(action) => write!(f, "Unknown action: \"{action}\""),
|
||
}
|
||
}
|
||
}
|
||
|
||
fn format_statement_help(f: &mut dyn Write) -> std::fmt::Result {
|
||
write!(
|
||
f,
|
||
r#"** Policy statements:
|
||
|
||
One policy statement should be treated as a single parameter;
|
||
this means each policy statement should be enclosed in quotes.
|
||
Multiple policy statements can be provided in a single command.
|
||
|
||
Statements has a format of "<rule_name> [args...]".
|
||
Arguments labeled with (^) can accept one or more entries.
|
||
Multiple entries consist of a space separated list enclosed in braces ({{}}).
|
||
Arguments labeled with (*) are the same as (^), but additionally
|
||
support the match-all operator (*).
|
||
|
||
Example: "allow {{ s1 s2 }} {{ t1 t2 }} class *"
|
||
Will be expanded to:
|
||
|
||
allow s1 t1 class {{ all-permissions-of-class }}
|
||
allow s1 t2 class {{ all-permissions-of-class }}
|
||
allow s2 t1 class {{ all-permissions-of-class }}
|
||
allow s2 t2 class {{ all-permissions-of-class }}
|
||
|
||
** Extended permissions:
|
||
|
||
The only supported operation for extended permissions right now is 'ioctl'.
|
||
xperm_set is one or multiple hexadecimal numeric values ranging from 0x0000 to 0xFFFF.
|
||
Multiple values consist of a space separated list enclosed in braces ({{}}).
|
||
Use the complement operator (~) to specify all permissions except those explicitly listed.
|
||
Use the range operator (-) to specify all permissions within the low – high range.
|
||
Use the match all operator (*) to match all ioctl commands (0x0000-0xFFFF).
|
||
The special value 0 is used to clear all rules.
|
||
|
||
Some examples:
|
||
allowxperm source target class ioctl 0x8910
|
||
allowxperm source target class ioctl {{ 0x8910-0x8926 0x892A-0x8935 }}
|
||
allowxperm source target class ioctl ~{{ 0x8910 0x892A }}
|
||
allowxperm source target class ioctl *
|
||
|
||
** Supported policy statements:
|
||
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
{}
|
||
"#,
|
||
ParseError::AvtabAv(Token::AL),
|
||
ParseError::AvtabAv(Token::DN),
|
||
ParseError::AvtabAv(Token::AA),
|
||
ParseError::AvtabAv(Token::DA),
|
||
ParseError::AvtabXperms(Token::AX),
|
||
ParseError::AvtabXperms(Token::AY),
|
||
ParseError::AvtabXperms(Token::DX),
|
||
ParseError::TypeState(Token::PM),
|
||
ParseError::TypeState(Token::EF),
|
||
ParseError::TypeAttr,
|
||
ParseError::NewType,
|
||
ParseError::NewAttr,
|
||
ParseError::TypeTrans,
|
||
ParseError::AvtabType(Token::TC),
|
||
ParseError::AvtabType(Token::TM),
|
||
ParseError::GenfsCon
|
||
)
|
||
}
|
||
|
||
pub fn print_statement_help() {
|
||
format_statement_help(&mut FmtAdaptor(&mut stderr())).ok();
|
||
eprintln!();
|
||
}
|