移除平台依赖代码

This commit is contained in:
MeiK 2021-04-06 21:38:16 +08:00
parent d667248050
commit 04566b44fb
24 changed files with 52 additions and 2048 deletions

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@ -1,2 +0,0 @@
#!/bin/bash
$(which cargo) ${@:1}

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@ -1,2 +0,0 @@
#!/bin/bash
$(which cargo-clippy) ${@:1}

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@ -1,2 +0,0 @@
#!/bin/bash
$(which cargo-fmt) ${@:1}

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@ -1,2 +0,0 @@
#!/bin/bash
$(which cargo-miri) ${@:1}

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@ -1,2 +0,0 @@
#!/bin/bash
$(which cargo-ndk) ${@:1}

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@ -1,2 +0,0 @@
#!/bin/bash
$(which clippy-driver) ${@:1}

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@ -1,2 +0,0 @@
#!/bin/bash
$(which rls) ${@:1}

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@ -1,2 +0,0 @@
#!/bin/bash
$(which rust-gdb) ${@:1}

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@ -1,2 +0,0 @@
#!/bin/bash
$(which rust-lldb) ${@:1}

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@ -1,6 +0,0 @@
#!/bin/bash
if [[ " ${@} " =~ " --target " ]]; then
$(which rustc) ${@:1}
else
$(which rustc) ${@:1} --target "x86_64-unknown-linux-gnu"
fi

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@ -1,2 +0,0 @@
#!/bin/bash
$(which rustdoc) ${@:1}

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@ -1,2 +0,0 @@
#!/bin/bash
$(which rustfmt) ${@:1}

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@ -1,2 +0,0 @@
#!/bin/bash
$(which rustup) ${@:1}

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@ -1,2 +0,0 @@
[build]
target = "x86_64-unknown-linux-gnu"

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@ -5,10 +5,23 @@ appenders:
encoder:
pattern: "{d(%Y-%m-%d %H:%M:%S)} [{h({l})}] {m}{n}"
file:
kind: file
kind: rolling_file
path: "logs/river.log"
append: true
encoder:
pattern: "{d(%Y-%m-%d %H:%M:%S)} [{l}] {m}{n}"
policy:
kind: compound
trigger:
kind: size
limit: 10 mb
roller:
kind: fixed_window
pattern: "logs/river.{}.log"
count: 5
base: 1
root:
level: info
appenders:

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@ -1,60 +0,0 @@
use crate::error::{Error, Result};
use std::fs;
use std::fs::{read_to_string, remove_dir};
use std::path::PathBuf;
use tempfile::tempdir_in;
pub struct CGroupOptions {
path: PathBuf,
}
impl CGroupOptions {
pub fn new(base_path: &str) -> Result<CGroupOptions> {
let pwd = try_io!(tempdir_in(base_path));
Ok(CGroupOptions {
path: pwd.path().to_path_buf(),
})
}
/// 将指定进程加入该 cgroup 组
pub fn apply(&self, pid: i32) -> Result<()> {
self.set("cgroup.procs", &format!("{}", pid))
}
/// e.g `set("memory.limit_in_bytes", "67108864")`
pub fn set(&self, key: &str, value: &str) -> Result<()> {
try_io!(fs::write(self.path.join(key), value));
Ok(())
}
/// e.g `get("memory.max_usage_in_bytes")`
pub fn get(&self, key: &str) -> Result<String> {
Ok(try_io!(read_to_string(self.path.join(key))))
}
}
impl Drop for CGroupOptions {
fn drop(&mut self) {
remove_dir(&self.path).unwrap();
}
}
/// cgroup v1
pub struct CGroupSet {
// pub cpuset: CGroupOptions,
pub memory: CGroupOptions,
}
impl CGroupSet {
pub fn new() -> Result<CGroupSet> {
Ok(CGroupSet {
// cpuset: CGroupOptions::new("/sys/fs/cgroup/cpuset")?,
memory: CGroupOptions::new("/sys/fs/cgroup/memory")?,
})
}
pub fn apply(&self, pid: i32) -> Result<()> {
// self.cpuset.apply(pid)?;
self.memory.apply(pid)?;
Ok(())
}
}

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@ -1,9 +1,10 @@
use lazy_static::lazy_static;
use num_cpus;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::fs;
use std::sync::Arc;
use lazy_static::lazy_static;
use num_cpus;
use serde::{Deserialize, Serialize};
use tokio::sync::Semaphore;
pub static STDIN_FILENAME: &str = "stdin.txt";

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@ -1,12 +1,13 @@
#![macro_use]
use libc::strerror;
use std::ffi::CStr;
use std::ffi::{NulError, OsString};
use std::ffi::CStr;
use std::fmt;
use std::io;
use std::result;
use libc::strerror;
#[allow(dead_code)]
#[derive(Debug)]
pub enum Error {

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@ -1,86 +0,0 @@
use super::error::{Error, Result};
use std::collections::HashMap;
use std::ffi::CString;
use std::mem;
use std::ptr;
#[cfg(test)]
use std::println as debug;
pub struct ExecArgs {
pub pathname: *const libc::c_char,
pub argv: *const *const libc::c_char,
pub envp: *const *const libc::c_char,
}
impl ExecArgs {
pub fn build(cmd: &String) -> Result<ExecArgs> {
let cmds: Vec<&str> = cmd.split_whitespace().collect();
let pathname = cmds[0].clone();
let pathname_str = match CString::new(pathname) {
Ok(value) => value,
Err(err) => return Err(Error::StringToCStringError(err)),
};
let pathname = pathname_str.as_ptr();
let mut argv_vec: Vec<*const libc::c_char> = vec![];
for item in cmds.iter() {
let cstr = match CString::new(item.clone()) {
Ok(value) => value,
Err(err) => return Err(Error::StringToCStringError(err)),
};
let cptr = cstr.as_ptr();
// 需要使用 mem::forget 来标记
// 否则在此次循环结束后cstr 就会被回收,后续 exec 函数无法通过指针获取到字符串内容
mem::forget(cstr);
argv_vec.push(cptr);
}
// argv 与 envp 的参数需要使用 NULL 来标记结束
argv_vec.push(ptr::null());
let argv: *const *const libc::c_char = argv_vec.as_ptr() as *const *const libc::c_char;
// env 传递环境变量
let mut envs: HashMap<&str, &str> = HashMap::new();
envs.insert(
"PATH",
"/root/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
);
envs.insert("HOME", "/tmp");
// envs.insert("GOCACHE", "/tmp/.cache");
envs.insert("TERM", "xterm");
let mut envp_vec: Vec<*const libc::c_char> = vec![];
for (key, value) in envs {
let mut key = String::from(key);
key.push_str("=");
key.push_str(&value);
let cstr = match CString::new(key) {
Ok(value) => value,
Err(err) => return Err(Error::StringToCStringError(err)),
};
let cptr = cstr.as_ptr();
// 需要使用 mem::forget 来标记
// 否则在此次循环结束后cstr 就会被回收,后续 exec 函数无法通过指针获取到字符串内容
mem::forget(cstr);
envp_vec.push(cptr);
}
envp_vec.push(ptr::null());
let envp = envp_vec.as_ptr() as *const *const libc::c_char;
mem::forget(pathname_str);
mem::forget(argv_vec);
mem::forget(envp_vec);
Ok(ExecArgs {
pathname,
argv,
envp,
})
}
}
impl Drop for ExecArgs {
fn drop(&mut self) {
// TODO: 将不安全的指针类型转换回内置类型,以便由 Rust 自动回收资源
// TODO: 优先级较低,因为目前只在子进程里进行这个操作,且操作后会很快 exec操作系统会回收这些内存
debug!("TODO");
}
}

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@ -1,14 +1,15 @@
use std::path::Path;
use tokio::fs;
use tokio::fs::read_to_string;
use crate::config::{CONFIG, CPU_SEMAPHORE, STDERR_FILENAME, STDIN_FILENAME, STDOUT_FILENAME};
use crate::error::{Error, Result};
use crate::process::{Process, Runner};
use crate::result::{
accepted, compile_error, compile_success, memory_limit_exceeded, runtime_error,
standard_result, time_limit_exceeded, wrong_answer,
};
use crate::river::{JudgeResponse, JudgeResultEnum, JudgeType};
use std::path::Path;
use tokio::fs;
use tokio::fs::read_to_string;
pub async fn compile(language: &str, code: &str, path: &Path) -> Result<JudgeResponse> {
info!("compile: language = `{}`", language);
@ -18,34 +19,12 @@ pub async fn compile(language: &str, code: &str, path: &Path) -> Result<JudgeRes
};
try_io!(fs::write(path.join(&lang.code_file), &code).await);
let process = Process::new(
String::from(&lang.compile_cmd),
10000,
1024 * 1024,
path.to_path_buf(),
);
let semaphore = CPU_SEMAPHORE.clone();
let permit = semaphore.acquire().await;
let result = Runner::from(process)?;
let status = result.await?;
// TODO: run process
drop(permit);
let mem_used = if status.memory_used < status.cgroup_memory_used {
status.memory_used
} else {
status.cgroup_memory_used
};
if status.exit_code != 0 || status.signal != 0 {
// 合并 stdout 与 stderr 为 errmsg
// 因为不同的语言、不同的编译器,错误信息输出到了不同的地方
let errmsg = format!(
"{}\n{}",
try_io!(read_to_string(path.join(STDOUT_FILENAME)).await),
try_io!(read_to_string(path.join(STDERR_FILENAME)).await),
);
return Ok(compile_error(status.time_used, mem_used, &errmsg));
} else {
return Ok(compile_success(status.time_used, mem_used));
}
Ok(compile_success(0, 0))
}
pub async fn judge(
@ -66,60 +45,10 @@ pub async fn judge(
Some(val) => val,
None => return Err(Error::LanguageNotFound(String::from(language))),
};
let process = Process::new(
String::from(&lang.run_cmd),
time_limit,
memory_limit,
path.to_path_buf(),
);
// 信号量控制并发
let semaphore = CPU_SEMAPHORE.clone();
let permit = semaphore.acquire().await;
let result = Runner::from(process)?;
let status = result.await?;
// TODO: run process
drop(permit);
// 为了更好的体验,此处内存用量取 getrusage 报告与 cgroup 报告中较小的一个
let mem_used = if status.memory_used < status.cgroup_memory_used {
status.memory_used
} else {
status.cgroup_memory_used
};
if status.time_used > time_limit.into()
|| status.real_time_used as i64 > (time_limit * 2 + 2).into()
{
// TLE
return Ok(time_limit_exceeded(status.time_used, mem_used));
} else if mem_used > memory_limit.into() {
// MLE
return Ok(memory_limit_exceeded(status.time_used, mem_used));
} else if status.signal != 0 {
// RE
return Ok(runtime_error(
status.time_used,
mem_used,
&format!("Program was interrupted by signal: `{}`", status.signal),
));
} else if status.exit_code != 0 {
// RE
// 就算是用户自己返回的非零,也算 RE
return Ok(runtime_error(
status.time_used,
mem_used,
&format!("Exceptional program return code: `{}`", status.exit_code),
));
} else if judge_type == JudgeType::Standard as i32 {
// 答案对比
let out = try_io!(fs::read(path.join(STDOUT_FILENAME)).await);
let ans = try_io!(fs::read(data_dir.join(&out_file)).await);
let res = standard_result(&out, &ans)?;
if res == JudgeResultEnum::Accepted {
return Ok(accepted(status.time_used, mem_used));
} else {
return Ok(wrong_answer(status.time_used, mem_used));
}
}
Err(Error::CustomError(String::from(format!(
"Unknown JudgeType: {}",
judge_type
))))
Ok(accepted(0, 0))
}

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@ -2,31 +2,29 @@
#[macro_use]
extern crate log;
use std::path::Path;
use std::pin::Pin;
use futures::StreamExt;
use futures_core::Stream;
use log4rs;
use river::judge_request::Data;
use river::river_server::{River, RiverServer};
use tempfile::tempdir_in;
use tokio::fs::read_dir;
use tonic::{Request, Response, Status};
use tonic::transport::Server;
use river::{
Empty, JudgeRequest, JudgeResponse, JudgeResultEnum, LanguageConfigResponse, LanguageItem,
LsCase, LsRequest, LsResponse,
};
use std::path::Path;
use std::pin::Pin;
use tempfile::tempdir_in;
use tokio::fs::read_dir;
use tonic::transport::Server;
use tonic::{Request, Response, Status};
use river::judge_request::Data;
use river::river_server::{River, RiverServer};
mod config;
mod error;
mod cgroup;
mod exec_args;
mod judger;
mod process;
mod result;
mod seccomp;
pub mod river {
tonic::include_proto!("river");
@ -38,7 +36,7 @@ pub struct RiverService {}
#[tonic::async_trait]
impl River for RiverService {
type JudgeStream =
Pin<Box<dyn Stream<Item = Result<JudgeResponse, Status>> + Send + Sync + 'static>>;
Pin<Box<dyn Stream<Item=Result<JudgeResponse, Status>> + Send + Sync + 'static>>;
async fn judge(
&self,
@ -125,7 +123,7 @@ impl River for RiverService {
});
}
let response = LanguageConfigResponse {
languages: languages,
languages,
};
Ok(Response::new(response))
}

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@ -1,592 +0,0 @@
use crate::cgroup::CGroupSet;
use crate::config::{STDERR_FILENAME, STDIN_FILENAME, STDOUT_FILENAME};
use crate::error::{errno_str, Error, Result};
use crate::exec_args::ExecArgs;
use crate::seccomp;
use libc;
use std::convert::TryInto;
use std::ffi::CString;
use std::fs::remove_file;
use std::future::Future;
use std::io;
use std::path::{Path, PathBuf};
use std::pin::Pin;
use std::ptr;
use std::sync::{mpsc, Arc, Mutex};
use std::task::{Context, Poll};
use std::thread;
use std::time::{Duration, SystemTime};
#[cfg(test)]
use std::println as debug;
const STACK_SIZE: usize = 1024 * 1024;
macro_rules! syscall_or_panic {
($expression:expr) => {
if $expression < 0 {
let err = io::Error::last_os_error().raw_os_error();
panic!(errno_str(err));
};
};
}
macro_rules! c_str_ptr {
($expression:expr) => {
CString::new($expression).unwrap().as_ptr()
};
}
#[derive(Clone)]
pub struct Process {
pub cmd: String,
pub time_limit: i32,
pub memory_limit: i32,
pub workdir: PathBuf,
}
#[derive(Clone)]
pub struct RunnerStatus {
pub rusage: libc::rusage,
pub exit_code: i32,
pub status: i32,
pub signal: i32,
pub time_used: i64,
pub real_time_used: u128,
pub memory_used: i64,
pub cgroup_memory_used: i64,
pub errmsg: String,
}
impl Process {
pub fn new(cmd: String, time_limit: i32, memory_limit: i32, workdir: PathBuf) -> Process {
let runner = Process {
cmd: cmd,
time_limit: time_limit,
memory_limit: memory_limit,
workdir: workdir,
};
runner
}
}
// 为 clone 的栈所需的指针创建 Send 与 Sync 包装
// 因为 Rust 编译器不允许原始的 c_void 在线程间同步
// 我们可以创建一个包装来规避这个问题,但前提是我们需要明白我们在做什么
struct Stack {
stack: *const libc::c_void,
}
unsafe impl Send for Stack {}
unsafe impl Sync for Stack {}
pub struct Runner {
process: Process,
pid: i32,
tx: Arc<Mutex<mpsc::Sender<RunnerStatus>>>,
rx: Arc<Mutex<mpsc::Receiver<RunnerStatus>>>,
stack: Stack,
cgroup_set: CGroupSet,
}
impl Runner {
pub fn from(process: Process) -> Result<Runner> {
let (tx, rx) = mpsc::channel();
let stack = unsafe {
libc::mmap(
ptr::null_mut(),
STACK_SIZE,
libc::PROT_READ | libc::PROT_WRITE,
libc::MAP_PRIVATE | libc::MAP_ANONYMOUS | libc::MAP_STACK,
-1,
0,
)
};
debug!("mmap stack");
Ok(Runner {
process: process,
pid: -1,
tx: Arc::new(Mutex::new(tx)),
rx: Arc::new(Mutex::new(rx)),
stack: Stack { stack: stack },
cgroup_set: CGroupSet::new()?,
})
}
}
unsafe fn killpid(pid: i32) {
let mut status = 0;
// > 0: 对应子进程退出但未回收资源
// = 0: 对应子进程存在但未退出
// 如果在运行过程中上层异常中断,则需要 kill 子进程并回收资源
if libc::waitpid(pid, &mut status, libc::WNOHANG) >= 0 {
libc::kill(pid, 9);
libc::waitpid(pid, &mut status, 0);
}
}
impl Drop for Runner {
fn drop(&mut self) {
debug!("dropping");
unsafe {
libc::munmap(self.stack.stack as *mut libc::c_void, STACK_SIZE);
debug!("munmap stack");
killpid(self.pid);
}
}
}
impl Future for Runner {
type Output = Result<RunnerStatus>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<RunnerStatus>> {
let runner = Pin::into_inner(self);
let time_limit = (runner.process.time_limit / 1000 + 1) as u64 * 2;
// 如果 pid == -1则说明子进程还没有运行
if runner.pid == -1 {
let waker = cx.waker().clone();
let pid = unsafe {
libc::clone(
runit,
(runner.stack.stack as usize + STACK_SIZE) as *mut libc::c_void,
libc::SIGCHLD
| libc::CLONE_NEWUTS // 设置新的 UTS 名称空间(主机名、网络名等)
| libc::CLONE_NEWNET // 设置新的网络空间,如果没有配置网络,则该沙盒内部将无法联网
| libc::CLONE_NEWNS // 为沙盒内部设置新的 namespaces 空间
| libc::CLONE_NEWIPC // IPC 隔离
| libc::CLONE_NEWCGROUP // 在新的 CGROUP 中创建沙盒
| libc::CLONE_NEWPID, // 外部进程对沙盒不可见
&mut runner.process as *mut _ as *mut libc::c_void,
)
};
debug!("pid = {}", pid);
runner.pid = pid;
// 设置 cgroup 限制
// 此处为父进程做的策略,所以没有与子进程的安全策略放一块
runner.cgroup_set.apply(pid).unwrap();
// 阻止沙盒内部使用 swap
runner.cgroup_set.memory.set(
"memory.swappiness",
"0",
)?;
runner.cgroup_set.memory.set(
"memory.limit_in_bytes",
&format!("{}", runner.process.memory_limit as i64 * 1024 * 10), // 本来应该乘以 1024此处放宽限制从而让用户体验更好
)?;
let tx = runner.tx.clone();
// 因为 wait 会阻塞等待结果,因此此处使用 thread::spawn 来 wait以防止主流程被阻塞
thread::spawn(move || {
// 监控程序超时的任务
// 此限制相对宽松sec * 2 + 2尽可能在保证系统安全的前提下给评测最好的体验
thread::spawn(move || {
thread::sleep(Duration::from_secs(time_limit));
unsafe {
killpid(pid);
}
});
let status = Runner::waitpid(pid);
// 子流程运行结束后通知主流程
let status_tx = tx.lock().unwrap();
status_tx.send(status).unwrap();
waker.wake();
});
return Poll::Pending;
} else {
let mut status = runner.rx.lock().unwrap().recv().unwrap();
let mem_used = match runner
.cgroup_set
.memory
.get("memory.max_usage_in_bytes")?
.trim()
.parse::<i64>()
{
Ok(val) => val,
Err(e) => return Poll::Ready(Err(Error::ParseIntError(e))),
};
status.cgroup_memory_used = mem_used / 1024;
debug!("cpu time used: {} ms", status.time_used);
debug!("real time used: {} ms", status.real_time_used);
debug!("cgroup memory used: {} KiB", status.cgroup_memory_used);
debug!("rusage memory used: {} KiB", status.memory_used);
if status.signal < 0 {
return Poll::Ready(Err(Error::SystemError(status.errmsg)));
}
return Poll::Ready(Ok(status));
}
}
}
impl Runner {
fn waitpid(pid: i32) -> RunnerStatus {
let mut status: i32 = 0;
let mut rusage = new_rusage();
let start = SystemTime::now();
unsafe {
if libc::wait4(pid, &mut status, 0, &mut rusage) < 0 {
return judge_system_error(String::from("wait4 failure!"));
}
}
let real_time_used = match start.elapsed() {
Ok(elapsed) => elapsed.as_millis(),
Err(_) => return judge_system_error(String::from("real time elapsed failure!")),
};
let mut exit_code = 0;
let exited = libc::WIFEXITED(status);
if exited {
exit_code = libc::WEXITSTATUS(status);
}
let signal = if libc::WIFSIGNALED(status) {
libc::WTERMSIG(status)
} else if libc::WIFSTOPPED(status) {
libc::WSTOPSIG(status)
} else {
0
};
let time_used = rusage.ru_utime.tv_sec * 1000
+ i64::from(rusage.ru_utime.tv_usec) / 1000
+ rusage.ru_stime.tv_sec * 1000
+ i64::from(rusage.ru_stime.tv_usec) / 1000;
let memory_used = rusage.ru_maxrss;
RunnerStatus {
errmsg: String::from(""),
memory_used: memory_used,
cgroup_memory_used: -1,
time_used: time_used,
real_time_used: real_time_used,
exit_code: exit_code,
signal: signal,
status: status,
rusage: rusage,
}
}
}
extern "C" fn runit(process: *mut libc::c_void) -> i32 {
let process = unsafe { &mut *(process as *mut Process) };
debug!("cmd = {}", process.cmd);
let exec_args = ExecArgs::build(&process.cmd).unwrap();
unsafe {
security(&process);
fd_dup();
syscall_or_panic!(libc::execve(
exec_args.pathname,
exec_args.argv,
exec_args.envp
));
// 理论上并不会到这里,因此如果到这里,直接 kill 掉
syscall_or_panic!(libc::kill(libc::getpid(), libc::SIGKILL));
}
0
}
/// 为评测沙盒提供安全保障
///
/// 包括以下策略:
///
/// - `mount` 隔离运行目录,安全的将内部数据传递出去
/// - `chdir` && `chroot`,将评测沙盒与宿主机的文件系统隔离
/// - `sethostname` && `setdomainname`,不暴露真实机器名
/// - `setgid` && `setuid`,修改运行用户为低权限的 `nobody`,配合文件权限,防止代码对沙盒内部进行恶意修改
/// - `seccomp` 阻止执行危险的系统调用
/// - `CLONE_NEWNET` 禁止沙盒内部连接网络
/// - `CLONE_NEWPID` 隔离内外进程空间
unsafe fn security(process: &Process) {
// 全局默认权限 755为运行目录设置特权
syscall_or_panic!(libc::chmod(
c_str_ptr!(process.workdir.to_str().unwrap()),
0o777,
));
// 等同于 mount --make-rprivate /
// 不将挂载传播到其他空间,以免造成挂载混淆
syscall_or_panic!(libc::mount(
c_str_ptr!(""),
c_str_ptr!("/"),
c_str_ptr!(""),
libc::MS_PRIVATE | libc::MS_REC,
ptr::null_mut()
));
// 挂载 /proc 目录,有些语言(比如 rust依赖此目录
syscall_or_panic!(libc::mount(
c_str_ptr!("proc"),
c_str_ptr!("runtime/rootfs/proc"),
c_str_ptr!("proc"),
0,
ptr::null_mut(),
));
// 挂载运行文件夹,除此目录外程序没有其他目录的写权限
syscall_or_panic!(libc::mount(
c_str_ptr!(process.workdir.to_str().unwrap()),
c_str_ptr!("runtime/rootfs/tmp"),
c_str_ptr!("none"),
libc::MS_BIND | libc::MS_PRIVATE,
ptr::null_mut(),
));
// chdir && chroot隔离文件系统
syscall_or_panic!(libc::chdir(c_str_ptr!("runtime/rootfs")));
syscall_or_panic!(libc::chroot(c_str_ptr!(".")));
syscall_or_panic!(libc::chdir(c_str_ptr!("/tmp")));
// 设置主机名
syscall_or_panic!(libc::sethostname(c_str_ptr!("river"), 5));
syscall_or_panic!(libc::setdomainname(c_str_ptr!("river"), 5));
// 修改用户为 nobody
syscall_or_panic!(libc::setgid(65534));
syscall_or_panic!(libc::setuid(65534));
let filter = seccomp::SeccompFilter::new(
deny_syscalls().into_iter().collect(),
seccomp::SeccompAction::Allow,
)
.unwrap();
seccomp::SeccompFilter::apply(filter.try_into().unwrap()).unwrap();
}
/// 重定向 `stdin`、`stdout`、`stderr`
unsafe fn fd_dup() {
// 重定向文件描述符
if Path::new(STDIN_FILENAME).exists() {
dup(STDIN_FILENAME, libc::STDIN_FILENO, libc::O_RDONLY, 0o644);
}
if Path::new(STDOUT_FILENAME).exists() {
remove_file(STDOUT_FILENAME).unwrap();
}
dup(
STDOUT_FILENAME,
libc::STDOUT_FILENO,
libc::O_CREAT | libc::O_RDWR,
0o644,
);
if Path::new(STDERR_FILENAME).exists() {
remove_file(STDERR_FILENAME).unwrap();
}
dup(
STDERR_FILENAME,
libc::STDERR_FILENO,
libc::O_CREAT | libc::O_RDWR,
0o644,
);
}
unsafe fn dup(filename: &str, to: libc::c_int, flag: libc::c_int, mode: libc::c_int) {
let filename_str = CString::new(filename).unwrap();
let filename = filename_str.as_ptr();
let fd = libc::open(filename, flag, mode);
if fd < 0 {
let err = io::Error::last_os_error().raw_os_error();
panic!(errno_str(err));
}
syscall_or_panic!(libc::dup2(fd, to));
}
/// 阻止危险的系统调用
///
/// 参照 Docker 文档 [significant-syscalls-blocked-by-the-default-profile](https://docs.docker.com/engine/security/seccomp/#significant-syscalls-blocked-by-the-default-profile) 一节
fn deny_syscalls() -> Vec<seccomp::SyscallRuleSet> {
vec![
deny_syscall(libc::SYS_acct),
deny_syscall(libc::SYS_add_key),
deny_syscall(libc::SYS_bpf),
deny_syscall(libc::SYS_clock_adjtime),
deny_syscall(libc::SYS_clock_settime),
deny_syscall(libc::SYS_create_module),
deny_syscall(libc::SYS_delete_module),
deny_syscall(libc::SYS_finit_module),
deny_syscall(libc::SYS_get_kernel_syms),
deny_syscall(libc::SYS_get_mempolicy),
deny_syscall(libc::SYS_init_module),
deny_syscall(libc::SYS_ioperm),
deny_syscall(libc::SYS_iopl),
deny_syscall(libc::SYS_kcmp),
deny_syscall(libc::SYS_kexec_file_load),
deny_syscall(libc::SYS_kexec_load),
deny_syscall(libc::SYS_keyctl),
deny_syscall(libc::SYS_lookup_dcookie),
deny_syscall(libc::SYS_mbind),
deny_syscall(libc::SYS_mount),
deny_syscall(libc::SYS_move_pages),
deny_syscall(libc::SYS_name_to_handle_at),
deny_syscall(libc::SYS_nfsservctl),
deny_syscall(libc::SYS_open_by_handle_at),
deny_syscall(libc::SYS_perf_event_open),
deny_syscall(libc::SYS_personality),
deny_syscall(libc::SYS_pivot_root),
deny_syscall(libc::SYS_process_vm_readv),
deny_syscall(libc::SYS_process_vm_writev),
deny_syscall(libc::SYS_ptrace),
deny_syscall(libc::SYS_query_module),
deny_syscall(libc::SYS_quotactl),
deny_syscall(libc::SYS_reboot),
deny_syscall(libc::SYS_request_key),
deny_syscall(libc::SYS_set_mempolicy),
deny_syscall(libc::SYS_setns),
deny_syscall(libc::SYS_settimeofday),
deny_syscall(libc::SYS_swapon),
deny_syscall(libc::SYS_swapoff),
deny_syscall(libc::SYS_sysfs),
deny_syscall(libc::SYS__sysctl),
deny_syscall(libc::SYS_umount2),
deny_syscall(libc::SYS_unshare),
deny_syscall(libc::SYS_uselib),
deny_syscall(libc::SYS_userfaultfd),
deny_syscall(libc::SYS_ustat),
]
}
#[inline(always)]
fn deny_syscall(syscall_number: i64) -> seccomp::SyscallRuleSet {
(
syscall_number,
vec![seccomp::SeccompRule::new(
vec![],
seccomp::SeccompAction::Kill,
)],
)
}
/// 一个全为 `0` 的 `rusage`
#[inline(always)]
fn new_rusage() -> libc::rusage {
libc::rusage {
ru_utime: libc::timeval {
tv_sec: 0 as libc::time_t,
tv_usec: 0 as libc::suseconds_t,
},
ru_stime: libc::timeval {
tv_sec: 0 as libc::time_t,
tv_usec: 0 as libc::suseconds_t,
},
ru_maxrss: 0 as libc::c_long,
ru_ixrss: 0 as libc::c_long,
ru_idrss: 0 as libc::c_long,
ru_isrss: 0 as libc::c_long,
ru_minflt: 0 as libc::c_long,
ru_majflt: 0 as libc::c_long,
ru_nswap: 0 as libc::c_long,
ru_inblock: 0 as libc::c_long,
ru_oublock: 0 as libc::c_long,
ru_msgsnd: 0 as libc::c_long,
ru_msgrcv: 0 as libc::c_long,
ru_nsignals: 0 as libc::c_long,
ru_nvcsw: 0 as libc::c_long,
ru_nivcsw: 0 as libc::c_long,
}
}
/// 由于评测系统本身异常而产生的错误
///
/// 因为正常程序返回 `signal` 不能为负数,因此此处使用负数的 `signal` 标识系统错误
#[inline(always)]
fn judge_system_error(errmsg: String) -> RunnerStatus {
RunnerStatus {
rusage: new_rusage(),
exit_code: -1,
status: -1,
signal: -1,
time_used: -1,
memory_used: -1,
cgroup_memory_used: -1,
real_time_used: 0,
errmsg: errmsg,
}
}
#[cfg(test)]
mod tests {
use super::*;
use tempfile::tempdir_in;
#[tokio::test]
async fn test_echo() {
let pwd = tempdir_in("/tmp").unwrap();
let process = Process::new(
String::from("/bin/echo Hello World!"),
1000,
65535,
pwd.path().to_path_buf(),
);
let result = Runner::from(process).unwrap().await.unwrap();
assert_eq!(result.exit_code, 0);
}
#[tokio::test]
async fn test_sleep() {
let pwd = tempdir_in("/tmp").unwrap();
let process = Process::new(
String::from("/bin/sleep 1"),
2000,
65535,
pwd.path().to_path_buf(),
);
let result = Runner::from(process).unwrap().await.unwrap();
assert!(result.real_time_used > 1000);
assert!(result.real_time_used < 1500);
}
#[tokio::test]
async fn test_output() {
let pwd = tempdir_in("/tmp").unwrap();
let process = Process::new(
String::from("/bin/echo Hello World!"),
1000,
65535,
pwd.path().to_path_buf(),
);
let runner = Runner::from(process).unwrap();
let _ = runner.await.unwrap();
let out = std::fs::read_to_string(pwd.path().join(STDOUT_FILENAME)).unwrap();
assert_eq!(out, "Hello World!\n");
}
#[tokio::test]
async fn time_limit() {
let pwd = tempdir_in("/tmp").unwrap();
let process = Process::new(
String::from("/bin/sleep 100"),
1000,
65535,
pwd.path().to_path_buf(),
);
let result = Runner::from(process).unwrap().await.unwrap();
assert!(result.time_used < 2000);
assert!(result.real_time_used < 5000);
assert!(result.real_time_used >= 1000);
assert_ne!(result.signal, 0);
}
#[tokio::test]
async fn test_ls() {
let pwd = tempdir_in("/tmp").unwrap();
let process = Process::new(
String::from("/bin/ls -lah /dev"),
1000,
65535,
pwd.path().to_path_buf(),
);
let result = Runner::from(process).unwrap().await.unwrap();
assert_eq!(result.signal, 0);
let out = std::fs::read_to_string(pwd.path().join(STDOUT_FILENAME)).unwrap();
println!("{}", out);
}
#[tokio::test]
async fn test_dev_null() {
let pwd = tempdir_in("/tmp").unwrap();
let process = Process::new(
String::from("/bin/cat /dev/null"),
1000,
65535,
pwd.path().to_path_buf(),
);
let result = Runner::from(process).unwrap().await.unwrap();
assert_eq!(result.signal, 0);
let out = std::fs::read_to_string(pwd.path().join(STDOUT_FILENAME)).unwrap();
println!("{}", out);
}
}

View File

@ -1,7 +1,7 @@
use crate::error::Error;
use crate::error::Result;
use crate::river::judge_response::State;
use crate::river::{JudgeResponse, JudgeResult, JudgeResultEnum, JudgeStatus};
use crate::river::judge_response::State;
pub fn system_error(err: Error) -> JudgeResponse {
warn!("{}", err);
@ -30,8 +30,8 @@ pub fn running() -> JudgeResponse {
pub fn compile_error(time_used: i64, memory_used: i64, errmsg: &str) -> JudgeResponse {
JudgeResponse {
state: Some(State::Result(JudgeResult {
time_used: time_used,
memory_used: memory_used,
time_used,
memory_used,
result: JudgeResultEnum::CompileError as i32,
errmsg: String::from(errmsg),
})),
@ -61,8 +61,8 @@ pub fn memory_limit_exceeded(time_used: i64, memory_used: i64) -> JudgeResponse
pub fn runtime_error(time_used: i64, memory_used: i64, errmsg: &str) -> JudgeResponse {
JudgeResponse {
state: Some(State::Result(JudgeResult {
time_used: time_used,
memory_used: memory_used,
time_used,
memory_used,
result: JudgeResultEnum::RuntimeError as i32,
errmsg: String::from(errmsg),
})),
@ -72,8 +72,8 @@ pub fn runtime_error(time_used: i64, memory_used: i64, errmsg: &str) -> JudgeRes
fn judge_result(time_used: i64, memory_used: i64, result: JudgeResultEnum) -> JudgeResponse {
JudgeResponse {
state: Some(State::Result(JudgeResult {
time_used: time_used,
memory_used: memory_used,
time_used,
memory_used,
result: result as i32,
errmsg: String::from(""),
})),
@ -173,6 +173,7 @@ fn next_line(v: &[u8], offset: usize, len: usize) -> (usize, usize, bool) {
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test1() {
let v: &[u8] = "Hello World!".as_bytes();
@ -258,6 +259,7 @@ mod tests {
JudgeResultEnum::WrongAnswer
);
}
#[test]
fn test9() {
let ans: &[u8] = "".as_bytes();

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