proxmox-backup/proxmox-rest-server/src/rest.rs
Fabian Grünbichler 9a37bd6c84 tree-wide: fix needless borrows
found and fixed via clippy

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
2021-12-30 13:55:33 +01:00

768 lines
25 KiB
Rust

use std::collections::HashMap;
use std::future::Future;
use std::hash::BuildHasher;
use std::path::{Path, PathBuf};
use std::pin::Pin;
use std::sync::{Arc, Mutex};
use std::task::{Context, Poll};
use anyhow::{bail, format_err, Error};
use futures::future::{self, FutureExt, TryFutureExt};
use futures::stream::TryStreamExt;
use hyper::body::HttpBody;
use hyper::header::{self, HeaderMap};
use hyper::http::request::Parts;
use hyper::{Body, Request, Response, StatusCode};
use lazy_static::lazy_static;
use regex::Regex;
use serde_json::Value;
use tokio::fs::File;
use tokio::time::Instant;
use url::form_urlencoded;
use tower_service::Service;
use proxmox_router::{
check_api_permission, ApiHandler, ApiMethod, HttpError, Permission, RpcEnvironment,
RpcEnvironmentType, UserInformation,
};
use proxmox_router::http_err;
use proxmox_schema::{ObjectSchemaType, ParameterSchema};
use proxmox_http::client::RateLimitedStream;
use proxmox_async::compression::{DeflateEncoder, Level};
use proxmox_async::stream::AsyncReaderStream;
use crate::{
ApiConfig, FileLogger, AuthError, RestEnvironment, CompressionMethod,
normalize_uri_path, formatter::*,
};
extern "C" {
fn tzset();
}
struct AuthStringExtension(String);
struct EmptyUserInformation {}
impl UserInformation for EmptyUserInformation {
fn is_superuser(&self, _userid: &str) -> bool { false }
fn is_group_member(&self, _userid: &str, _group: &str) -> bool { false }
fn lookup_privs(&self, _userid: &str, _path: &[&str]) -> u64 { 0 }
}
/// REST server implementation (configured with [ApiConfig])
///
/// This struct implements the [Service] trait in order to use it with
/// [hyper::server::Builder::serve].
pub struct RestServer {
api_config: Arc<ApiConfig>,
}
const MAX_URI_QUERY_LENGTH: usize = 3072;
const CHUNK_SIZE_LIMIT: u64 = 32 * 1024;
impl RestServer {
/// Creates a new instance.
pub fn new(api_config: ApiConfig) -> Self {
Self {
api_config: Arc::new(api_config),
}
}
}
impl Service<&Pin<Box<tokio_openssl::SslStream<RateLimitedStream<tokio::net::TcpStream>>>>>
for RestServer
{
type Response = ApiService;
type Error = Error;
type Future = Pin<Box<dyn Future<Output = Result<ApiService, Error>> + Send>>;
fn poll_ready(&mut self, _cx: &mut Context) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(
&mut self,
ctx: &Pin<Box<tokio_openssl::SslStream<RateLimitedStream<tokio::net::TcpStream>>>>,
) -> Self::Future {
match ctx.get_ref().peer_addr() {
Err(err) => future::err(format_err!("unable to get peer address - {}", err)).boxed(),
Ok(peer) => future::ok(ApiService {
peer,
api_config: self.api_config.clone(),
})
.boxed(),
}
}
}
impl Service<&Pin<Box<tokio_openssl::SslStream<tokio::net::TcpStream>>>>
for RestServer
{
type Response = ApiService;
type Error = Error;
type Future = Pin<Box<dyn Future<Output = Result<ApiService, Error>> + Send>>;
fn poll_ready(&mut self, _cx: &mut Context) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(
&mut self,
ctx: &Pin<Box<tokio_openssl::SslStream<tokio::net::TcpStream>>>,
) -> Self::Future {
match ctx.get_ref().peer_addr() {
Err(err) => future::err(format_err!("unable to get peer address - {}", err)).boxed(),
Ok(peer) => future::ok(ApiService {
peer,
api_config: self.api_config.clone(),
})
.boxed(),
}
}
}
impl Service<&hyper::server::conn::AddrStream> for RestServer {
type Response = ApiService;
type Error = Error;
type Future = Pin<Box<dyn Future<Output = Result<ApiService, Error>> + Send>>;
fn poll_ready(&mut self, _cx: &mut Context) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, ctx: &hyper::server::conn::AddrStream) -> Self::Future {
let peer = ctx.remote_addr();
future::ok(ApiService {
peer,
api_config: self.api_config.clone(),
})
.boxed()
}
}
impl Service<&tokio::net::UnixStream> for RestServer {
type Response = ApiService;
type Error = Error;
type Future = Pin<Box<dyn Future<Output = Result<ApiService, Error>> + Send>>;
fn poll_ready(&mut self, _cx: &mut Context) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, _ctx: &tokio::net::UnixStream) -> Self::Future {
// TODO: Find a way to actually represent the vsock peer in the ApiService struct - for now
// it doesn't really matter, so just use a fake IP address
let fake_peer = "0.0.0.0:807".parse().unwrap();
future::ok(ApiService {
peer: fake_peer,
api_config: self.api_config.clone(),
})
.boxed()
}
}
// Helper [Service] containing the peer Address
//
// The lower level connection [Service] implementation on
// [RestServer] extracts the peer address and return an [ApiService].
//
// Rust wants this type 'pub' here (else we get 'private type `ApiService`
// in public interface'). The type is still private because the crate does
// not export it.
pub struct ApiService {
pub peer: std::net::SocketAddr,
pub api_config: Arc<ApiConfig>,
}
fn log_response(
logfile: Option<&Arc<Mutex<FileLogger>>>,
peer: &std::net::SocketAddr,
method: hyper::Method,
path_query: &str,
resp: &Response<Body>,
user_agent: Option<String>,
) {
if resp.extensions().get::<NoLogExtension>().is_some() {
return;
};
// we also log URL-to-long requests, so avoid message bigger than PIPE_BUF (4k on Linux)
// to profit from atomicty guarantees for O_APPEND opened logfiles
let path = &path_query[..MAX_URI_QUERY_LENGTH.min(path_query.len())];
let status = resp.status();
if !(status.is_success() || status.is_informational()) {
let reason = status.canonical_reason().unwrap_or("unknown reason");
let message = match resp.extensions().get::<ErrorMessageExtension>() {
Some(data) => &data.0,
None => "request failed",
};
log::error!(
"{} {}: {} {}: [client {}] {}",
method.as_str(),
path,
status.as_str(),
reason,
peer,
message
);
}
if let Some(logfile) = logfile {
let auth_id = match resp.extensions().get::<AuthStringExtension>() {
Some(AuthStringExtension(auth_id)) => auth_id.clone(),
None => "-".to_string(),
};
let now = proxmox_time::epoch_i64();
// time format which apache/nginx use (by default), copied from pve-http-server
let datetime = proxmox_time::strftime_local("%d/%m/%Y:%H:%M:%S %z", now)
.unwrap_or_else(|_| "-".to_string());
logfile.lock().unwrap().log(format!(
"{} - {} [{}] \"{} {}\" {} {} {}",
peer.ip(),
auth_id,
datetime,
method.as_str(),
path,
status.as_str(),
resp.body().size_hint().lower(),
user_agent.unwrap_or_else(|| "-".to_string()),
));
}
}
fn get_proxied_peer(headers: &HeaderMap) -> Option<std::net::SocketAddr> {
lazy_static! {
static ref RE: Regex = Regex::new(r#"for="([^"]+)""#).unwrap();
}
let forwarded = headers.get(header::FORWARDED)?.to_str().ok()?;
let capture = RE.captures(forwarded)?;
let rhost = capture.get(1)?.as_str();
rhost.parse().ok()
}
fn get_user_agent(headers: &HeaderMap) -> Option<String> {
let agent = headers.get(header::USER_AGENT)?.to_str();
agent
.map(|s| {
let mut s = s.to_owned();
s.truncate(128);
s
})
.ok()
}
impl Service<Request<Body>> for ApiService {
type Response = Response<Body>;
type Error = Error;
#[allow(clippy::type_complexity)]
type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
fn poll_ready(&mut self, _cx: &mut Context) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, req: Request<Body>) -> Self::Future {
let path = req.uri().path_and_query().unwrap().as_str().to_owned();
let method = req.method().clone();
let user_agent = get_user_agent(req.headers());
let config = Arc::clone(&self.api_config);
let peer = match get_proxied_peer(req.headers()) {
Some(proxied_peer) => proxied_peer,
None => self.peer,
};
async move {
let response = match handle_request(Arc::clone(&config), req, &peer).await {
Ok(response) => response,
Err(err) => {
let (err, code) = match err.downcast_ref::<HttpError>() {
Some(apierr) => (apierr.message.clone(), apierr.code),
_ => (err.to_string(), StatusCode::BAD_REQUEST),
};
Response::builder()
.status(code)
.extension(ErrorMessageExtension(err.to_string()))
.body(err.into())?
}
};
let logger = config.get_access_log();
log_response(logger, &peer, method, &path, &response, user_agent);
Ok(response)
}
.boxed()
}
}
fn parse_query_parameters<S: 'static + BuildHasher + Send>(
param_schema: ParameterSchema,
form: &str, // x-www-form-urlencoded body data
parts: &Parts,
uri_param: &HashMap<String, String, S>,
) -> Result<Value, Error> {
let mut param_list: Vec<(String, String)> = vec![];
if !form.is_empty() {
for (k, v) in form_urlencoded::parse(form.as_bytes()).into_owned() {
param_list.push((k, v));
}
}
if let Some(query_str) = parts.uri.query() {
for (k, v) in form_urlencoded::parse(query_str.as_bytes()).into_owned() {
if k == "_dc" {
continue;
} // skip extjs "disable cache" parameter
param_list.push((k, v));
}
}
for (k, v) in uri_param {
param_list.push((k.clone(), v.clone()));
}
let params = param_schema.parse_parameter_strings(&param_list, true)?;
Ok(params)
}
async fn get_request_parameters<S: 'static + BuildHasher + Send>(
param_schema: ParameterSchema,
parts: Parts,
req_body: Body,
uri_param: HashMap<String, String, S>,
) -> Result<Value, Error> {
let mut is_json = false;
if let Some(value) = parts.headers.get(header::CONTENT_TYPE) {
match value.to_str().map(|v| v.split(';').next()) {
Ok(Some("application/x-www-form-urlencoded")) => {
is_json = false;
}
Ok(Some("application/json")) => {
is_json = true;
}
_ => bail!("unsupported content type {:?}", value.to_str()),
}
}
let body = TryStreamExt::map_err(req_body, |err| {
http_err!(BAD_REQUEST, "Problems reading request body: {}", err)
})
.try_fold(Vec::new(), |mut acc, chunk| async move {
// FIXME: max request body size?
if acc.len() + chunk.len() < 64 * 1024 {
acc.extend_from_slice(&*chunk);
Ok(acc)
} else {
Err(http_err!(BAD_REQUEST, "Request body too large"))
}
})
.await?;
let utf8_data =
std::str::from_utf8(&body).map_err(|err| format_err!("Request body not uft8: {}", err))?;
if is_json {
let mut params: Value = serde_json::from_str(utf8_data)?;
for (k, v) in uri_param {
if let Some((_optional, prop_schema)) = param_schema.lookup(&k) {
params[&k] = prop_schema.parse_simple_value(&v)?;
}
}
param_schema.verify_json(&params)?;
return Ok(params);
} else {
parse_query_parameters(param_schema, utf8_data, &parts, &uri_param)
}
}
struct NoLogExtension();
async fn proxy_protected_request(
info: &'static ApiMethod,
mut parts: Parts,
req_body: Body,
peer: &std::net::SocketAddr,
) -> Result<Response<Body>, Error> {
let mut uri_parts = parts.uri.clone().into_parts();
uri_parts.scheme = Some(http::uri::Scheme::HTTP);
uri_parts.authority = Some(http::uri::Authority::from_static("127.0.0.1:82"));
let new_uri = http::Uri::from_parts(uri_parts).unwrap();
parts.uri = new_uri;
let mut request = Request::from_parts(parts, req_body);
request.headers_mut().insert(
header::FORWARDED,
format!("for=\"{}\";", peer).parse().unwrap(),
);
let reload_timezone = info.reload_timezone;
let resp = hyper::client::Client::new()
.request(request)
.map_err(Error::from)
.map_ok(|mut resp| {
resp.extensions_mut().insert(NoLogExtension());
resp
})
.await?;
if reload_timezone {
unsafe {
tzset();
}
}
Ok(resp)
}
pub(crate) async fn handle_api_request<Env: RpcEnvironment, S: 'static + BuildHasher + Send>(
mut rpcenv: Env,
info: &'static ApiMethod,
formatter: &'static dyn OutputFormatter,
parts: Parts,
req_body: Body,
uri_param: HashMap<String, String, S>,
) -> Result<Response<Body>, Error> {
let delay_unauth_time = std::time::Instant::now() + std::time::Duration::from_millis(3000);
let compression = extract_compression_method(&parts.headers);
let result = match info.handler {
ApiHandler::AsyncHttp(handler) => {
let params = parse_query_parameters(info.parameters, "", &parts, &uri_param)?;
(handler)(parts, req_body, params, info, Box::new(rpcenv)).await
}
ApiHandler::Sync(handler) => {
let params =
get_request_parameters(info.parameters, parts, req_body, uri_param).await?;
(handler)(params, info, &mut rpcenv).map(|data| formatter.format_data(data, &rpcenv))
}
ApiHandler::Async(handler) => {
let params =
get_request_parameters(info.parameters, parts, req_body, uri_param).await?;
(handler)(params, info, &mut rpcenv)
.await
.map(|data| formatter.format_data(data, &rpcenv))
}
};
let mut resp = match result {
Ok(resp) => resp,
Err(err) => {
if let Some(httperr) = err.downcast_ref::<HttpError>() {
if httperr.code == StatusCode::UNAUTHORIZED {
tokio::time::sleep_until(Instant::from_std(delay_unauth_time)).await;
}
}
formatter.format_error(err)
}
};
let resp = match compression {
Some(CompressionMethod::Deflate) => {
resp.headers_mut().insert(
header::CONTENT_ENCODING,
CompressionMethod::Deflate.content_encoding(),
);
resp.map(|body| {
Body::wrap_stream(DeflateEncoder::with_quality(
TryStreamExt::map_err(body, |err| {
proxmox_sys::io_format_err!("error during compression: {}", err)
}),
Level::Default,
))
})
}
None => resp,
};
if info.reload_timezone {
unsafe {
tzset();
}
}
Ok(resp)
}
fn extension_to_content_type(filename: &Path) -> (&'static str, bool) {
if let Some(ext) = filename.extension().and_then(|osstr| osstr.to_str()) {
return match ext {
"css" => ("text/css", false),
"html" => ("text/html", false),
"js" => ("application/javascript", false),
"json" => ("application/json", false),
"map" => ("application/json", false),
"png" => ("image/png", true),
"ico" => ("image/x-icon", true),
"gif" => ("image/gif", true),
"svg" => ("image/svg+xml", false),
"jar" => ("application/java-archive", true),
"woff" => ("application/font-woff", true),
"woff2" => ("application/font-woff2", true),
"ttf" => ("application/font-snft", true),
"pdf" => ("application/pdf", true),
"epub" => ("application/epub+zip", true),
"mp3" => ("audio/mpeg", true),
"oga" => ("audio/ogg", true),
"tgz" => ("application/x-compressed-tar", true),
_ => ("application/octet-stream", false),
};
}
("application/octet-stream", false)
}
async fn simple_static_file_download(
filename: PathBuf,
content_type: &'static str,
compression: Option<CompressionMethod>,
) -> Result<Response<Body>, Error> {
use tokio::io::AsyncReadExt;
let mut file = File::open(filename)
.await
.map_err(|err| http_err!(BAD_REQUEST, "File open failed: {}", err))?;
let mut data: Vec<u8> = Vec::new();
let mut response = match compression {
Some(CompressionMethod::Deflate) => {
let mut enc = DeflateEncoder::with_quality(data, Level::Default);
enc.compress_vec(&mut file, CHUNK_SIZE_LIMIT as usize)
.await?;
let mut response = Response::new(enc.into_inner().into());
response.headers_mut().insert(
header::CONTENT_ENCODING,
CompressionMethod::Deflate.content_encoding(),
);
response
}
None => {
file.read_to_end(&mut data)
.await
.map_err(|err| http_err!(BAD_REQUEST, "File read failed: {}", err))?;
Response::new(data.into())
}
};
response.headers_mut().insert(
header::CONTENT_TYPE,
header::HeaderValue::from_static(content_type),
);
Ok(response)
}
async fn chuncked_static_file_download(
filename: PathBuf,
content_type: &'static str,
compression: Option<CompressionMethod>,
) -> Result<Response<Body>, Error> {
let mut resp = Response::builder()
.status(StatusCode::OK)
.header(header::CONTENT_TYPE, content_type);
let file = File::open(filename)
.await
.map_err(|err| http_err!(BAD_REQUEST, "File open failed: {}", err))?;
let body = match compression {
Some(CompressionMethod::Deflate) => {
resp = resp.header(
header::CONTENT_ENCODING,
CompressionMethod::Deflate.content_encoding(),
);
Body::wrap_stream(DeflateEncoder::with_quality(
AsyncReaderStream::new(file),
Level::Default,
))
}
None => Body::wrap_stream(AsyncReaderStream::new(file)),
};
Ok(resp.body(body).unwrap())
}
async fn handle_static_file_download(
filename: PathBuf,
compression: Option<CompressionMethod>,
) -> Result<Response<Body>, Error> {
let metadata = tokio::fs::metadata(filename.clone())
.map_err(|err| http_err!(BAD_REQUEST, "File access problems: {}", err))
.await?;
let (content_type, nocomp) = extension_to_content_type(&filename);
let compression = if nocomp { None } else { compression };
if metadata.len() < CHUNK_SIZE_LIMIT {
simple_static_file_download(filename, content_type, compression).await
} else {
chuncked_static_file_download(filename, content_type, compression).await
}
}
// FIXME: support handling multiple compression methods
fn extract_compression_method(headers: &http::HeaderMap) -> Option<CompressionMethod> {
if let Some(Ok(encodings)) = headers.get(header::ACCEPT_ENCODING).map(|v| v.to_str()) {
for encoding in encodings.split(&[',', ' '][..]) {
if let Ok(method) = encoding.parse() {
return Some(method);
}
}
}
None
}
async fn handle_request(
api: Arc<ApiConfig>,
req: Request<Body>,
peer: &std::net::SocketAddr,
) -> Result<Response<Body>, Error> {
let (parts, body) = req.into_parts();
let method = parts.method.clone();
let (path, components) = normalize_uri_path(parts.uri.path())?;
let comp_len = components.len();
let query = parts.uri.query().unwrap_or_default();
if path.len() + query.len() > MAX_URI_QUERY_LENGTH {
return Ok(Response::builder()
.status(StatusCode::URI_TOO_LONG)
.body("".into())
.unwrap());
}
let env_type = api.env_type();
let mut rpcenv = RestEnvironment::new(env_type, Arc::clone(&api));
rpcenv.set_client_ip(Some(*peer));
let delay_unauth_time = std::time::Instant::now() + std::time::Duration::from_millis(3000);
let access_forbidden_time = std::time::Instant::now() + std::time::Duration::from_millis(500);
if comp_len >= 1 && components[0] == "api2" {
if comp_len >= 2 {
let format = components[1];
let formatter: &dyn OutputFormatter = match format {
"json" => JSON_FORMATTER,
"extjs" => EXTJS_FORMATTER,
_ => bail!("Unsupported output format '{}'.", format),
};
let mut uri_param = HashMap::new();
let api_method = api.find_method(&components[2..], method.clone(), &mut uri_param);
let mut auth_required = true;
if let Some(api_method) = api_method {
if let Permission::World = *api_method.access.permission {
auth_required = false; // no auth for endpoints with World permission
}
}
let mut user_info: Box<dyn UserInformation + Send + Sync> = Box::new(EmptyUserInformation {});
if auth_required {
match api.check_auth(&parts.headers, &method).await {
Ok((authid, info)) => {
rpcenv.set_auth_id(Some(authid));
user_info = info;
}
Err(auth_err) => {
let err = match auth_err {
AuthError::Generic(err) => err,
AuthError::NoData => {
format_err!("no authentication credentials provided.")
}
};
// fixme: log Username??
rpcenv.log_failed_auth(None, &err.to_string());
// always delay unauthorized calls by 3 seconds (from start of request)
let err = http_err!(UNAUTHORIZED, "authentication failed - {}", err);
tokio::time::sleep_until(Instant::from_std(delay_unauth_time)).await;
return Ok(formatter.format_error(err));
}
}
}
match api_method {
None => {
let err = http_err!(NOT_FOUND, "Path '{}' not found.", path);
return Ok(formatter.format_error(err));
}
Some(api_method) => {
let auth_id = rpcenv.get_auth_id();
let user_info = user_info;
if !check_api_permission(
api_method.access.permission,
auth_id.as_deref(),
&uri_param,
user_info.as_ref(),
) {
let err = http_err!(FORBIDDEN, "permission check failed");
tokio::time::sleep_until(Instant::from_std(access_forbidden_time)).await;
return Ok(formatter.format_error(err));
}
let result = if api_method.protected && env_type == RpcEnvironmentType::PUBLIC {
proxy_protected_request(api_method, parts, body, peer).await
} else {
handle_api_request(rpcenv, api_method, formatter, parts, body, uri_param)
.await
};
let mut response = match result {
Ok(resp) => resp,
Err(err) => formatter.format_error(err),
};
if let Some(auth_id) = auth_id {
response.extensions_mut().insert(AuthStringExtension(auth_id));
}
return Ok(response);
}
}
}
} else {
// not Auth required for accessing files!
if method != hyper::Method::GET {
bail!("Unsupported HTTP method {}", method);
}
if comp_len == 0 {
match api.check_auth(&parts.headers, &method).await {
Ok((auth_id, _user_info)) => {
rpcenv.set_auth_id(Some(auth_id));
return Ok(api.get_index(rpcenv, parts).await);
}
Err(AuthError::Generic(_)) => {
tokio::time::sleep_until(Instant::from_std(delay_unauth_time)).await;
}
Err(AuthError::NoData) => {}
}
return Ok(api.get_index(rpcenv, parts).await);
} else {
let filename = api.find_alias(&components);
let compression = extract_compression_method(&parts.headers);
return handle_static_file_download(filename, compression).await;
}
}
Err(http_err!(NOT_FOUND, "Path '{}' not found.", path))
}