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Fix quality parse error in Accept-Encoding HTTP header (#2344)

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Arthur Le Moigne 2021-09-01 10:08:29 +02:00 committed by GitHub
parent 373b3f91df
commit ddc8c16cb3
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7 changed files with 259 additions and 77 deletions
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7
CHANGES.md
View file

@ -4,10 +4,15 @@
### Added
* Re-export actix-service `ServiceFactory` in `dev` module. [#2325]
### Changes
### Changed
* Minimum supported Rust version (MSRV) is now 1.51.
* Compress middleware will return 406 Not Acceptable when no content encoding is acceptable to the client. [#2344]
### Fixed
* Fix quality parse error in Accept-Encoding header. [#2344]
[#2325]: https://github.com/actix/actix-web/pull/2325
[#2344]: https://github.com/actix/actix-web/pull/2344
## 4.0.0-beta.8 - 2021-06-26

5
actix-http/CHANGES.md
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@ -1,22 +1,23 @@
# Changes
## Unreleased - 2021-xx-xx
### Changes
### Changed
* Minimum supported Rust version (MSRV) is now 1.51.
### Fixed
* Remove slice creation pointing to potential uninitialized data on h1 encoder. [#2364]
* Remove `Into<Error>` bound on `Encoder` body types. [#2375]
* Fix quality parse error in Accept-Encoding header. [#2344]
[#2364]: https://github.com/actix/actix-web/pull/2364
[#2375]: https://github.com/actix/actix-web/pull/2375
[#2344]: https://github.com/actix/actix-web/pull/2344
## 3.0.0-beta.8 - 2021-08-09
### Fixed
* Potential HTTP request smuggling vulnerabilities. [RUSTSEC-2021-0081](https://github.com/rustsec/advisory-db/pull/977)
## 3.0.0-beta.8 - 2021-06-26
### Changed
* Change compression algorithm features flags. [#2250]

3
actix-http/src/encoding/decoder.rs
View file

@ -1,6 +1,7 @@
//! Stream decoders.
use std::{
convert::TryFrom,
future::Future,
io::{self, Write as _},
pin::Pin,
@ -80,7 +81,7 @@ where
let encoding = headers
.get(&CONTENT_ENCODING)
.and_then(|val| val.to_str().ok())
.map(ContentEncoding::from)
.and_then(|x| ContentEncoding::try_from(x).ok())
.unwrap_or(ContentEncoding::Identity);
Self::new(stream, encoding)

56
actix-http/src/header/shared/content_encoding.rs
View file

@ -1,4 +1,4 @@
use std::{convert::Infallible, str::FromStr};
use std::{convert::TryFrom, error, fmt, str::FromStr};
use http::header::InvalidHeaderValue;
@ -8,6 +8,20 @@ use crate::{
HttpMessage,
};
/// Error return when a content encoding is unknown.
///
/// Example: 'compress'
#[derive(Debug)]
pub struct ContentEncodingParseError;
impl fmt::Display for ContentEncodingParseError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Unsupported content encoding")
}
}
impl error::Error for ContentEncodingParseError {}
/// Represents a supported content encoding.
#[derive(Copy, Clone, PartialEq, Debug)]
pub enum ContentEncoding {
@ -37,7 +51,7 @@ impl ContentEncoding {
matches!(self, ContentEncoding::Identity | ContentEncoding::Auto)
}
/// Convert content encoding to string
/// Convert content encoding to string.
#[inline]
pub fn as_str(self) -> &'static str {
match self {
@ -48,18 +62,6 @@ impl ContentEncoding {
ContentEncoding::Identity | ContentEncoding::Auto => "identity",
}
}
/// Default Q-factor (quality) value.
#[inline]
pub fn quality(self) -> f64 {
match self {
ContentEncoding::Br => 1.1,
ContentEncoding::Gzip => 1.0,
ContentEncoding::Deflate => 0.9,
ContentEncoding::Identity | ContentEncoding::Auto => 0.1,
ContentEncoding::Zstd => 0.0,
}
}
}
impl Default for ContentEncoding {
@ -69,31 +71,33 @@ impl Default for ContentEncoding {
}
impl FromStr for ContentEncoding {
type Err = Infallible;
type Err = ContentEncodingParseError;
fn from_str(val: &str) -> Result<Self, Self::Err> {
Ok(Self::from(val))
}
}
impl From<&str> for ContentEncoding {
fn from(val: &str) -> ContentEncoding {
let val = val.trim();
if val.eq_ignore_ascii_case("br") {
ContentEncoding::Br
Ok(ContentEncoding::Br)
} else if val.eq_ignore_ascii_case("gzip") {
ContentEncoding::Gzip
Ok(ContentEncoding::Gzip)
} else if val.eq_ignore_ascii_case("deflate") {
ContentEncoding::Deflate
Ok(ContentEncoding::Deflate)
} else if val.eq_ignore_ascii_case("zstd") {
ContentEncoding::Zstd
Ok(ContentEncoding::Zstd)
} else {
ContentEncoding::default()
Err(ContentEncodingParseError)
}
}
}
impl TryFrom<&str> for ContentEncoding {
type Error = ContentEncodingParseError;
fn try_from(val: &str) -> Result<Self, Self::Error> {
val.parse()
}
}
impl IntoHeaderValue for ContentEncoding {
type Error = InvalidHeaderValue;

29
actix-http/src/header/shared/quality_item.rs
View file

@ -1,11 +1,14 @@
use std::{
cmp,
convert::{TryFrom, TryInto},
fmt, str,
fmt,
str::{self, FromStr},
};
use derive_more::{Display, Error};
use crate::error::ParseError;
const MAX_QUALITY: u16 = 1000;
const MAX_FLOAT_QUALITY: f32 = 1.0;
@ -113,12 +116,12 @@ impl<T: fmt::Display> fmt::Display for QualityItem<T> {
}
}
impl<T: str::FromStr> str::FromStr for QualityItem<T> {
type Err = crate::error::ParseError;
impl<T: FromStr> FromStr for QualityItem<T> {
type Err = ParseError;
fn from_str(qitem_str: &str) -> Result<QualityItem<T>, crate::error::ParseError> {
fn from_str(qitem_str: &str) -> Result<Self, Self::Err> {
if !qitem_str.is_ascii() {
return Err(crate::error::ParseError::Header);
return Err(ParseError::Header);
}
// Set defaults used if parsing fails.
@ -139,7 +142,7 @@ impl<T: str::FromStr> str::FromStr for QualityItem<T> {
if parts[0].len() < 2 {
// Can't possibly be an attribute since an attribute needs at least a name followed
// by an equals sign. And bare identifiers are forbidden.
return Err(crate::error::ParseError::Header);
return Err(ParseError::Header);
}
let start = &parts[0][0..2];
@ -148,25 +151,21 @@ impl<T: str::FromStr> str::FromStr for QualityItem<T> {
let q_val = &parts[0][2..];
if q_val.len() > 5 {
// longer than 5 indicates an over-precise q-factor
return Err(crate::error::ParseError::Header);
return Err(ParseError::Header);
}
let q_value = q_val
.parse::<f32>()
.map_err(|_| crate::error::ParseError::Header)?;
let q_value = q_val.parse::<f32>().map_err(|_| ParseError::Header)?;
if (0f32..=1f32).contains(&q_value) {
quality = q_value;
raw_item = parts[1];
} else {
return Err(crate::error::ParseError::Header);
return Err(ParseError::Header);
}
}
}
let item = raw_item
.parse::<T>()
.map_err(|_| crate::error::ParseError::Header)?;
let item = raw_item.parse::<T>().map_err(|_| ParseError::Header)?;
// we already checked above that the quality is within range
Ok(QualityItem::new(item, Quality::from_f32(quality)))
@ -224,7 +223,7 @@ mod tests {
}
}
impl str::FromStr for Encoding {
impl FromStr for Encoding {
type Err = crate::error::ParseError;
fn from_str(s: &str) -> Result<Encoding, crate::error::ParseError> {
use Encoding::*;

217
src/middleware/compress.rs
View file

@ -2,10 +2,10 @@
use std::{
cmp,
convert::TryFrom,
future::Future,
marker::PhantomData,
pin::Pin,
str::FromStr,
task::{Context, Poll},
};
@ -13,16 +13,18 @@ use actix_http::{
body::{MessageBody, ResponseBody},
encoding::Encoder,
http::header::{ContentEncoding, ACCEPT_ENCODING},
StatusCode,
};
use actix_service::{Service, Transform};
use actix_utils::future::{ok, Ready};
use actix_utils::future::{ok, Either, Ready};
use futures_core::ready;
use once_cell::sync::Lazy;
use pin_project::pin_project;
use crate::{
dev::BodyEncoding,
service::{ServiceRequest, ServiceResponse},
Error,
Error, HttpResponse,
};
/// Middleware for compressing response payloads.
@ -78,34 +80,78 @@ pub struct CompressMiddleware<S> {
encoding: ContentEncoding,
}
static SUPPORTED_ALGORITHM_NAMES: Lazy<String> = Lazy::new(|| {
let mut encoding = vec![];
#[cfg(feature = "compress-brotli")]
{
encoding.push("br");
}
#[cfg(feature = "compress-gzip")]
{
encoding.push("gzip");
encoding.push("deflate");
}
#[cfg(feature = "compress-zstd")]
encoding.push("zstd");
assert!(
!encoding.is_empty(),
"encoding can not be empty unless __compress feature has been explicitly enabled by itself"
);
encoding.join(", ")
});
impl<S, B> Service<ServiceRequest> for CompressMiddleware<S>
where
B: MessageBody,
S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
B: MessageBody,
{
type Response = ServiceResponse<ResponseBody<Encoder<B>>>;
type Error = Error;
type Future = CompressResponse<S, B>;
type Future = Either<CompressResponse<S, B>, Ready<Result<Self::Response, Self::Error>>>;
actix_service::forward_ready!(service);
#[allow(clippy::borrow_interior_mutable_const)]
fn call(&self, req: ServiceRequest) -> Self::Future {
// negotiate content-encoding
let encoding = if let Some(val) = req.headers().get(&ACCEPT_ENCODING) {
if let Ok(enc) = val.to_str() {
AcceptEncoding::parse(enc, self.encoding)
} else {
ContentEncoding::Identity
}
} else {
ContentEncoding::Identity
};
let encoding_result = req
.headers()
.get(&ACCEPT_ENCODING)
.and_then(|val| val.to_str().ok())
.map(|enc| AcceptEncoding::try_parse(enc, self.encoding));
CompressResponse {
encoding,
fut: self.service.call(req),
_phantom: PhantomData,
match encoding_result {
// Missing header => fallback to identity
None => Either::left(CompressResponse {
encoding: ContentEncoding::Identity,
fut: self.service.call(req),
_phantom: PhantomData,
}),
// Valid encoding
Some(Ok(encoding)) => Either::left(CompressResponse {
encoding,
fut: self.service.call(req),
_phantom: PhantomData,
}),
// There is an HTTP header but we cannot match what client as asked for
Some(Err(_)) => {
let res = HttpResponse::with_body(
StatusCode::NOT_ACCEPTABLE,
SUPPORTED_ALGORITHM_NAMES.as_str(),
);
let enc = ContentEncoding::Identity;
Either::right(ok(req.into_response(res.map_body(move |head, body| {
Encoder::response(enc, head, ResponseBody::Other(body.into()))
}))))
}
}
}
}
@ -114,7 +160,6 @@ where
pub struct CompressResponse<S, B>
where
S: Service<ServiceRequest>,
B: MessageBody,
{
#[pin]
fut: S::Future,
@ -151,6 +196,7 @@ where
struct AcceptEncoding {
encoding: ContentEncoding,
// TODO: use Quality or QualityItem<ContentEncoding>
quality: f64,
}
@ -177,26 +223,56 @@ impl PartialOrd for AcceptEncoding {
impl PartialEq for AcceptEncoding {
fn eq(&self, other: &AcceptEncoding) -> bool {
self.quality == other.quality
self.encoding == other.encoding && self.quality == other.quality
}
}
/// Parse q-factor from quality strings.
///
/// If parse fail, then fallback to default value which is 1.
/// More details available here: <https://developer.mozilla.org/en-US/docs/Glossary/Quality_values>
fn parse_quality(parts: &[&str]) -> f64 {
for part in parts {
if part.trim().starts_with("q=") {
return part[2..].parse().unwrap_or(1.0);
}
}
1.0
}
#[derive(Debug, PartialEq, Eq)]
enum AcceptEncodingError {
/// This error occurs when client only support compressed response and server do not have any
/// algorithm that match client accepted algorithms.
CompressionAlgorithmMismatch,
}
impl AcceptEncoding {
fn new(tag: &str) -> Option<AcceptEncoding> {
let parts: Vec<&str> = tag.split(';').collect();
let encoding = match parts.len() {
0 => return None,
_ => ContentEncoding::from(parts[0]),
};
let quality = match parts.len() {
1 => encoding.quality(),
_ => f64::from_str(parts[1]).unwrap_or(0.0),
_ => match ContentEncoding::try_from(parts[0]) {
Err(_) => return None,
Ok(x) => x,
},
};
let quality = parse_quality(&parts[1..]);
if quality <= 0.0 || quality > 1.0 {
return None;
}
Some(AcceptEncoding { encoding, quality })
}
/// Parse a raw Accept-Encoding header value into an ordered list.
pub fn parse(raw: &str, encoding: ContentEncoding) -> ContentEncoding {
/// Parse a raw Accept-Encoding header value into an ordered list then return the best match
/// based on middleware configuration.
pub fn try_parse(
raw: &str,
encoding: ContentEncoding,
) -> Result<ContentEncoding, AcceptEncodingError> {
let mut encodings = raw
.replace(' ', "")
.split(',')
@ -206,13 +282,90 @@ impl AcceptEncoding {
encodings.sort();
for enc in encodings {
if encoding == ContentEncoding::Auto {
return enc.encoding;
} else if encoding == enc.encoding {
return encoding;
if encoding == ContentEncoding::Auto || encoding == enc.encoding {
return Ok(enc.encoding);
}
}
ContentEncoding::Identity
// Special case if user cannot accept uncompressed data.
// See: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Encoding
// TODO: account for whitespace
if raw.contains("*;q=0") || raw.contains("identity;q=0") {
return Err(AcceptEncodingError::CompressionAlgorithmMismatch);
}
Ok(ContentEncoding::Identity)
}
}
#[cfg(test)]
mod tests {
use super::*;
macro_rules! assert_parse_eq {
($raw:expr, $result:expr) => {
assert_eq!(
AcceptEncoding::try_parse($raw, ContentEncoding::Auto),
Ok($result)
);
};
}
macro_rules! assert_parse_fail {
($raw:expr) => {
assert!(AcceptEncoding::try_parse($raw, ContentEncoding::Auto).is_err());
};
}
#[test]
fn test_parse_encoding() {
// Test simple case
assert_parse_eq!("br", ContentEncoding::Br);
assert_parse_eq!("gzip", ContentEncoding::Gzip);
assert_parse_eq!("deflate", ContentEncoding::Deflate);
assert_parse_eq!("zstd", ContentEncoding::Zstd);
// Test space, trim, missing values
assert_parse_eq!("br,,,,", ContentEncoding::Br);
assert_parse_eq!("gzip , br, zstd", ContentEncoding::Gzip);
// Test float number parsing
assert_parse_eq!("br;q=1 ,", ContentEncoding::Br);
assert_parse_eq!("br;q=1.0 , br", ContentEncoding::Br);
// Test wildcard
assert_parse_eq!("*", ContentEncoding::Identity);
assert_parse_eq!("*;q=1.0", ContentEncoding::Identity);
}
#[test]
fn test_parse_encoding_qfactor_ordering() {
assert_parse_eq!("gzip, br, zstd", ContentEncoding::Gzip);
assert_parse_eq!("zstd, br, gzip", ContentEncoding::Zstd);
assert_parse_eq!("gzip;q=0.4, br;q=0.6", ContentEncoding::Br);
assert_parse_eq!("gzip;q=0.8, br;q=0.4", ContentEncoding::Gzip);
}
#[test]
fn test_parse_encoding_qfactor_invalid() {
// Out of range
assert_parse_eq!("gzip;q=-5.0", ContentEncoding::Identity);
assert_parse_eq!("gzip;q=5.0", ContentEncoding::Identity);
// Disabled
assert_parse_eq!("gzip;q=0", ContentEncoding::Identity);
}
#[test]
fn test_parse_compression_required() {
// Check we fallback to identity if there is an unsupported compression algorithm
assert_parse_eq!("compress", ContentEncoding::Identity);
// User do not want any compression
assert_parse_fail!("compress, identity;q=0");
assert_parse_fail!("compress, identity;q=0.0");
assert_parse_fail!("compress, *;q=0");
assert_parse_fail!("compress, *;q=0.0");
}
}

19
tests/test_server.rs
View file

@ -1077,3 +1077,22 @@ async fn test_data_drop() {
assert_eq!(num.load(Ordering::SeqCst), 0);
}
#[actix_rt::test]
async fn test_accept_encoding_no_match() {
let srv = actix_test::start_with(actix_test::config().h1(), || {
App::new()
.wrap(Compress::default())
.service(web::resource("/").route(web::to(move || HttpResponse::Ok().finish())))
});
let response = srv
.get("/")
.append_header((ACCEPT_ENCODING, "compress, identity;q=0"))
.no_decompress()
.send()
.await
.unwrap();
assert_eq!(response.status().as_u16(), 406);
}