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Fix escaping/encoding problems in Content-Disposition header (#1151)

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* Fix filename encoding in Content-Disposition of acitx_files::NamedFile

* Add more comments on how to use Content-Disposition header properly & Fix some trivial problems

* Improve Content-Disposition filename(*) parameters of actix_files::NamedFile

* Tweak Content-Disposition parse to accept empty param value in quoted-string

* Fix typos in comments in .../content_disposition.rs (pointed out by @JohnTitor)

* Update CHANGES.md

* Update CHANGES.md again
This commit is contained in:
Hung-I Wang 2019-11-06 22:08:37 +08:00 committed by Nikolay Kim
parent f0612f7570
commit edcde67076
4 changed files with 119 additions and 10 deletions
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1
CHANGES.md
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@ -5,6 +5,7 @@
### Added
* Add `Payload::into_inner` method and make stored `def::Payload` public. (#1110)
* Add an additional `filename*` param in the `Content-Disposition` header of `actix_files::NamedFile` to be more compatible. (#1151)
### Changed

25
actix-files/src/lib.rs
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@ -733,6 +733,31 @@ mod tests {
assert!(resp.headers().get(header::CONTENT_DISPOSITION).is_none());
}
#[test]
fn test_named_file_non_ascii_file_name() {
let mut file =
NamedFile::from_file(File::open("Cargo.toml").unwrap(), "貨物.toml")
.unwrap();
{
file.file();
let _f: &File = &file;
}
{
let _f: &mut File = &mut file;
}
let req = TestRequest::default().to_http_request();
let resp = file.respond_to(&req).unwrap();
assert_eq!(
resp.headers().get(header::CONTENT_TYPE).unwrap(),
"text/x-toml"
);
assert_eq!(
resp.headers().get(header::CONTENT_DISPOSITION).unwrap(),
"inline; filename=\"貨物.toml\"; filename*=UTF-8''%E8%B2%A8%E7%89%A9.toml"
);
}
#[test]
fn test_named_file_set_content_type() {
let mut file = NamedFile::open("Cargo.toml")

13
actix-files/src/named.rs
View file

@ -13,7 +13,7 @@ use mime_guess::from_path;
use actix_http::body::SizedStream;
use actix_web::http::header::{
self, ContentDisposition, DispositionParam, DispositionType,
self, Charset, ContentDisposition, DispositionParam, DispositionType, ExtendedValue,
};
use actix_web::http::{ContentEncoding, StatusCode};
use actix_web::middleware::BodyEncoding;
@ -93,9 +93,18 @@ impl NamedFile {
mime::IMAGE | mime::TEXT | mime::VIDEO => DispositionType::Inline,
_ => DispositionType::Attachment,
};
let mut parameters =
vec![DispositionParam::Filename(String::from(filename.as_ref()))];
if !filename.is_ascii() {
parameters.push(DispositionParam::FilenameExt(ExtendedValue {
charset: Charset::Ext(String::from("UTF-8")),
language_tag: None,
value: filename.into_owned().into_bytes(),
}))
}
let cd = ContentDisposition {
disposition: disposition_type,
parameters: vec![DispositionParam::Filename(filename.into_owned())],
parameters: parameters,
};
(ct, cd)
};

90
actix-http/src/header/common/content_disposition.rs
View file

@ -76,6 +76,11 @@ pub enum DispositionParam {
/// the form.
Name(String),
/// A plain file name.
///
/// It is [not supposed](https://tools.ietf.org/html/rfc6266#appendix-D) to contain any
/// non-ASCII characters when used in a *Content-Disposition* HTTP response header, where
/// [`FilenameExt`](DispositionParam::FilenameExt) with charset UTF-8 may be used instead
/// in case there are Unicode characters in file names.
Filename(String),
/// An extended file name. It must not exist for `ContentType::Formdata` according to
/// [RFC7578 Section 4.2](https://tools.ietf.org/html/rfc7578#section-4.2).
@ -220,7 +225,16 @@ impl DispositionParam {
/// ext-token = <the characters in token, followed by "*">
/// ```
///
/// **Note**: filename* [must not](https://tools.ietf.org/html/rfc7578#section-4.2) be used within
/// # Note
///
/// filename is [not supposed](https://tools.ietf.org/html/rfc6266#appendix-D) to contain any
/// non-ASCII characters when used in a *Content-Disposition* HTTP response header, where
/// filename* with charset UTF-8 may be used instead in case there are Unicode characters in file
/// names.
/// filename is [acceptable](https://tools.ietf.org/html/rfc7578#section-4.2) to be UTF-8 encoded
/// directly in a *Content-Disposition* header for *multipart/form-data*, though.
///
/// filename* [must not](https://tools.ietf.org/html/rfc7578#section-4.2) be used within
/// *multipart/form-data*.
///
/// # Example
@ -251,6 +265,22 @@ impl DispositionParam {
/// };
/// assert_eq!(cd2.get_name(), Some("file")); // field name
/// assert_eq!(cd2.get_filename(), Some("bill.odt"));
///
/// // HTTP response header with Unicode characters in file names
/// let cd3 = ContentDisposition {
/// disposition: DispositionType::Attachment,
/// parameters: vec![
/// DispositionParam::FilenameExt(ExtendedValue {
/// charset: Charset::Ext(String::from("UTF-8")),
/// language_tag: None,
/// value: String::from("\u{1f600}.svg").into_bytes(),
/// }),
/// // fallback for better compatibility
/// DispositionParam::Filename(String::from("Grinning-Face-Emoji.svg"))
/// ],
/// };
/// assert_eq!(cd3.get_filename_ext().map(|ev| ev.value.as_ref()),
/// Some("\u{1f600}.svg".as_bytes()));
/// ```
///
/// # WARN
@ -333,15 +363,17 @@ impl ContentDisposition {
// token: won't contains semicolon according to RFC 2616 Section 2.2
let (token, new_left) = split_once_and_trim(left, ';');
left = new_left;
token.to_owned()
};
if value.is_empty() {
if token.is_empty() {
// quoted-string can be empty, but token cannot be empty
return Err(crate::error::ParseError::Header);
}
token.to_owned()
};
let param = if param_name.eq_ignore_ascii_case("name") {
DispositionParam::Name(value)
} else if param_name.eq_ignore_ascii_case("filename") {
// See also comments in test_from_raw_uncessary_percent_decode.
DispositionParam::Filename(value)
} else {
DispositionParam::Unknown(param_name.to_owned(), value)
@ -466,11 +498,40 @@ impl fmt::Display for DispositionType {
impl fmt::Display for DispositionParam {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// All ASCII control charaters (0-30, 127) excepting horizontal tab, double quote, and
// All ASCII control characters (0-30, 127) including horizontal tab, double quote, and
// backslash should be escaped in quoted-string (i.e. "foobar").
// Ref: RFC6266 S4.1 -> RFC2616 S2.2; RFC 7578 S4.2 -> RFC2183 S2 -> ... .
// Ref: RFC6266 S4.1 -> RFC2616 S3.6
// filename-parm = "filename" "=" value
// value = token | quoted-string
// quoted-string = ( <"> *(qdtext | quoted-pair ) <"> )
// qdtext = <any TEXT except <">>
// quoted-pair = "\" CHAR
// TEXT = <any OCTET except CTLs,
// but including LWS>
// LWS = [CRLF] 1*( SP | HT )
// OCTET = <any 8-bit sequence of data>
// CHAR = <any US-ASCII character (octets 0 - 127)>
// CTL = <any US-ASCII control character
// (octets 0 - 31) and DEL (127)>
//
// Ref: RFC7578 S4.2 -> RFC2183 S2 -> RFC2045 S5.1
// parameter := attribute "=" value
// attribute := token
// ; Matching of attributes
// ; is ALWAYS case-insensitive.
// value := token / quoted-string
// token := 1*<any (US-ASCII) CHAR except SPACE, CTLs,
// or tspecials>
// tspecials := "(" / ")" / "<" / ">" / "@" /
// "," / ";" / ":" / "\" / <">
// "/" / "[" / "]" / "?" / "="
// ; Must be in quoted-string,
// ; to use within parameter values
//
//
// See also comments in test_from_raw_uncessary_percent_decode.
lazy_static! {
static ref RE: Regex = Regex::new("[\x01-\x08\x10\x1F\x7F\"\\\\]").unwrap();
static ref RE: Regex = Regex::new("[\x00-\x08\x10-\x1F\x7F\"\\\\]").unwrap();
}
match self {
DispositionParam::Name(ref value) => write!(f, "name={}", value),
@ -774,8 +835,18 @@ mod tests {
#[test]
fn test_from_raw_uncessary_percent_decode() {
// In fact, RFC7578 (multipart/form-data) Section 2 and 4.2 suggests that filename with
// non-ASCII characters MAY be percent-encoded.
// On the contrary, RFC6266 or other RFCs related to Content-Disposition response header
// do not mention such percent-encoding.
// So, it appears to be undecidable whether to percent-decode or not without
// knowing the usage scenario (multipart/form-data v.s. HTTP response header) and
// inevitable to unnecessarily percent-decode filename with %XX in the former scenario.
// Fortunately, it seems that almost all mainstream browsers just send UTF-8 encoded file
// names in quoted-string format (tested on Edge, IE11, Chrome and Firefox) without
// percent-encoding. So we do not bother to attempt to percent-decode.
let a = HeaderValue::from_static(
"form-data; name=photo; filename=\"%74%65%73%74%2e%70%6e%67\"", // Should not be decoded!
"form-data; name=photo; filename=\"%74%65%73%74%2e%70%6e%67\"",
);
let a: ContentDisposition = ContentDisposition::from_raw(&a).unwrap();
let b = ContentDisposition {
@ -811,6 +882,9 @@ mod tests {
let a = HeaderValue::from_static("inline; filename= ");
assert!(ContentDisposition::from_raw(&a).is_err());
let a = HeaderValue::from_static("inline; filename=\"\"");
assert!(ContentDisposition::from_raw(&a).expect("parse cd").get_filename().expect("filename").is_empty());
}
#[test]