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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 25 Dec 2018
      • Report Tweet
      • Report NetzDG Violation

      Hector Martin Retweeted Gynvael Coldwind

      So yeah, um, this is not okay. It is not discoverable and could easily leak sensitive information. Auth credentials even, seriously? Also Chrome does this too. And it is preserved across `mv` to another filesystem.https://twitter.com/gynvael/status/1077671412847046657 …

      Hector Martin added,

      Gynvael Coldwind @gynvael
      TIL from @q3k and @marcan42: wget saves downloaded file's source URL (and sometimes referrer) in extended attributes. This includes the cases where the URL has a user/password in it 🙃 $ getfattr -d -m - test user.xdg.origin.url="https://user:passwd@gynvael.coldwind.pl/"
      6 replies 74 retweets 168 likes
      Show this thread
    2. Arisotura‏ @Arisotura 25 Dec 2018
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      Replying to @marcan42

      not that having a password in the URL would be a good security design anyway

      1 reply 0 retweets 4 likes
    3. Hector Martin‏ @marcan42 25 Dec 2018
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      Replying to @Arisotura

      This is how HTTP Basic authentication works. It's part of the HTTP URI standard. And wget is smart enough to hide the password when showing its messages on stderr, but then goes ahead and dumps it in the xattr verbatim.

      2 replies 1 retweet 10 likes
    4. mathew‏ @mathew 25 Dec 2018
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      Replying to @marcan42

      You don’t need to support credentials in URLs in order to support basic auth. The credentials are placed in header fields in the HTTP get request.

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 25 Dec 2018
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      Replying to @mathew

      Credentials in a URI is one (perhaps the only?) standard way for supplying the contents of that header field that is cross-application.

      2 replies 0 retweets 0 likes
    6. mathew‏ @mathew 26 Dec 2018
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      Replying to @marcan42

      Microsoft disabled it in IE for security reasons, so it wasn’t all that cross-application. A standard rule of web development is never to put anything confidential in the URL because URLs leak all over the place. Browser history, for example.

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 26 Dec 2018
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      Replying to @mathew

      The *point* of putting confidential information in the URL is to make it portable. So you can paste the URL into another app and it'll work. Yes, it's a tradeoff. But I don't expect the browser to deliberately leak them as non-discoverable xattrs on files.

      8:27 AM - 26 Dec 2018
      2 replies 0 retweets 0 likes
        1. mathew‏ @mathew 26 Dec 2018
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          Replying to @marcan42

          As RFC 1738 section 3.3, HTTP URLs: "No user name or password is allowed." RFC 3986 section 3.2.1, "Use of the format "user:password" in the userinfo field is deprecated… Applications may choose to ignore or reject such data when it is received as part of a reference…"

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        1. mathew‏ @mathew 26 Dec 2018
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          Replying to @marcan42

          RFC 3986 section 7.5: "URI producers should not provide a URI that contains a username or password that is intended to be secret. URIs are frequently displayed by browsers, stored in clear text bookmarks, and logged by user agent history and intermediary applications (proxies)."

          2 replies 0 retweets 0 likes
        2. mathew‏ @mathew 26 Dec 2018
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          Replying to @mathew @marcan42

          RFC 3986 s 7.5 contnd: "A password appearing within the userinfo component is deprecated and should be considered an error (or simply ignored) except in those rare cases where the 'password' parameter is intended to be public."

          1 reply 0 retweets 0 likes
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