./www/py-waitress, Production-quality pure-Python WSGI server

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Branch: CURRENT, Version: 1.4.3, Package name: py37-waitress-1.4.3, Maintainer: pkgsrc-users

Waitress is meant to be a production-quality pure-Python WSGI server
with very acceptable performance. It has no dependencies except
ones which live in the Python standard library. It supports HTTP/1.0
and HTTP/1.1.

Required to run:
[devel/py-setuptools] [lang/python37]

Required to build:

Master sites:

SHA1: 755394ce2b437443fe0db377ebdbfbb5c617bda3
RMD160: fe938585422bac73b6117586354a53f31f0999ba
Filesize: 169.694 KB

Version history: (Expand)

CVS history: (Expand)

   2020-05-13 16:43:28 by Adam Ciarcinski | Files touched by this commit (3) | Package updated
Log message:
py-waitress: updated to 1.4.3

1.4.3 (2020-02-02)

Security Fixes

- In Waitress version 1.4.2 a new regular expression was added to validate the
  headers that Waitress receives to make sure that it matches RFC7230.
  Unfortunately the regular expression was written in a way that with invalid
  input it leads to catastrophic backtracking which allows for a Denial of
  Service and CPU usage going to a 100%.

  This was reported by Fil Zembowicz to the Pylons Project. Please see
  https://github.com/Pylons/waitress/secu … -3pwg-5fgc
  for more information.

1.4.2 (2020-01-02)

Security Fixes

- This is a follow-up to the fix introduced in 1.4.1 to tighten up the way
  Waitress strips whitespace from header values. This makes sure Waitress won't
  accidentally treat non-printable characters as whitespace and lead to a
  potental HTTP request smuggling/splitting security issue.

  Thanks to ZeddYu Lu for the extra test cases.

  Please see the security advisory for more information:
  https://github.com/Pylons/waitress/secu … -3wj3-8ph4

  CVE-ID: CVE-2019-16789


- Updated the regex used to validate header-field content to match the errata
  that was published for RFC7230.

  See: https://www.rfc-editor.org/errata_searc … p;eid=4189

1.4.1 (2019-12-24)

Security Fixes

- Waitress did not properly validate that the HTTP headers it received were
  properly formed, thereby potentially allowing a front-end server to treat a
  request different from Waitress. This could lead to HTTP request

  Please see the security advisory for more information:
  https://github.com/Pylons/waitress/secu … -3wj3-8ph4

  CVE-ID: CVE-2019-16789

1.4.0 (2019-12-20)


- Waitress used to slam the door shut on HTTP pipelined requests without
  setting the ``Connection: close`` header as appropriate in the response. This
  is of course not very friendly. Waitress now explicitly sets the header when
  responding with an internally generated error such as 400 Bad Request or 500
  Internal Server Error to notify the remote client that it will be closing the
  connection after the response is sent.

- Waitress no longer allows any spaces to exist between the header field-name
  and the colon. While waitress did not strip the space and thereby was not
  vulnerable to any potential header field-name confusion, it should have sent
  back a 400 Bad Request. See https://github.com/Pylons/waitress/issues/273

Security Fixes

- Waitress implemented a "MAY" part of the RFC7230
  (https://tools.ietf.org/html/rfc7230#section-3.5) which states:

      Although the line terminator for the start-line and header fields is
      the sequence CRLF, a recipient MAY recognize a single LF as a line
      terminator and ignore any preceding CR.

  Unfortunately if a front-end server does not parse header fields with an LF
  the same way as it does those with a CRLF it can lead to the front-end and
  the back-end server parsing the same HTTP message in two different ways. This
  can lead to a potential for HTTP request smuggling/splitting whereby Waitress
  may see two requests while the front-end server only sees a single HTTP

  For more information I can highly recommend the blog post by ZeddYu Lu

  Please see the security advisory for more information:
  https://github.com/Pylons/waitress/secu … -wpm5-g57p

  CVE-ID: CVE-2019-16785

- Waitress used to treat LF the same as CRLF in ``Transfer-Encoding: chunked``
  requests, while the maintainer doesn't believe this could lead to a security
  issue, this is no longer supported and all chunks are now validated to be
  properly framed with CRLF as required by RFC7230.

- Waitress now validates that the ``Transfer-Encoding`` header contains only
  transfer codes that it is able to decode. At the moment that includes the
  only valid header value being ``chunked``.

  That means that if the following header is sent:

  ``Transfer-Encoding: gzip, chunked``

  Waitress will send back a 501 Not Implemented with an error message stating
  as such, as while Waitress supports ``chunked`` encoding it does not support
  ``gzip`` and it is unable to pass that to the underlying WSGI environment

  Waitress DOES NOT implement support for ``Transfer-Encoding: identity``
  eventhough ``identity`` was valid in RFC2616, it was removed in RFC7230.
  Please update your clients to remove the ``Transfer-Encoding`` header if the
  only transfer coding is ``identity`` or update your client to use
  ``Transfer-Encoding: chunked`` instead of ``Transfer-Encoding: identity,

  Please see the security advisory for more information:
  https://github.com/Pylons/waitress/secu … -35jw-c63p

  CVE-ID: CVE-2019-16786

- While validating the ``Transfer-Encoding`` header, Waitress now properly
  handles line-folded ``Transfer-Encoding`` headers or those that contain
  multiple comma seperated values. This closes a potential issue where a
  front-end server may treat the request as being a chunked request (and thus
  ignoring the Content-Length) and Waitress using the Content-Length as it was
  looking for the single value ``chunked`` and did not support comma seperated

- Waitress used to explicitly set the Content-Length header to 0 if it was
  unable to parse it as an integer (for example if the Content-Length header
  was sent twice (and thus folded together), or was invalid) thereby allowing
  for a potential request to be split and treated as two requests by HTTP
  pipelining support in Waitress. If Waitress is now unable to parse the
  Content-Length header, a 400 Bad Request is sent back to the client.

  Please see the security advisory for more information:
  https://github.com/Pylons/waitress/secu … -gpcr-7qf6
   2019-09-13 11:53:30 by Adam Ciarcinski | Files touched by this commit (3) | Package updated
Log message:
py-waitress: updated to 1.3.1


- Waitress won't accidentally throw away part of the path if it starts with a
  double slash (GET //testing/whatever HTTP/1.0). WSGI applications will
  now receive a PATH_INFO in the environment that contains
  //testing/whatever as required.
   2019-07-03 22:36:51 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-waitress: updated to 1.3.0



- The send_bytes adjustment now defaults to 1 and is deprecated
  pending removal in a future release.


- Add a new outbuf_high_watermark adjustment which is used to apply
  backpressure on the app_iter to avoid letting it spin faster than data
  can be written to the socket. This stabilizes responses that iterate quickly
  with a lot of data.

- Stop early and close the app_iter when attempting to write to a closed
  socket due to a client disconnect. This should notify a long-lived streaming
  response when a client hangs up.

- Adjust the flush to output SO_SNDBUF bytes instead of whatever was
  set in the send_bytes adjustment. send_bytes now only controls how
  much waitress will buffer internally before flushing to the kernel, whereas
  previously it used to also throttle how much data was sent to the kernel.
  This change enables a streaming app_iter containing small chunks to
  still be flushed efficiently.


- Upon receiving a request that does not include HTTP/1.0 or HTTP/1.1 we will
  no longer set the version to the string value "None". See

- When a client closes a socket unexpectedly there was potential for memory
  leaks in which data was written to the buffers after they were closed,
  causing them to reopen.

- Fix the queue depth warnings to only show when all threads are busy.

- Trigger the app_iter to close as part of shutdown. This will only be
  noticeable for users of the internal server api. In more typical operations
  the server will die before benefiting from these changes.

- Fix a bug in which a streaming app_iter may never cleanup data that has
  already been sent. This would cause buffers in waitress to grow without
  bounds. These buffers now properly rotate and release their data.

- Fix a bug in which non-seekable subclasses of io.IOBase would trigger
  an exception when passed to the wsgi.file_wrapper callback.
   2019-01-29 15:30:03 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-waitress: updated to 1.2.1


- When given an IPv6 address in X-Forwarded-For or Forwarded for=
  waitress was placing the IP address in REMOTE_ADDR with brackets:
  [2001:db8::0], this does not match the requirements in the CGI spec which
  REMOTE_ADDR was lifted from. Waitress will now place the bare IPv6
  address in REMOTE_ADDR: 2001:db8::0.
   2019-01-20 14:20:02 by Adam Ciarcinski | Files touched by this commit (4) | Package updated
Log message:
py-waitress: updated to 1.2.0

No changes since the last beta release. Enjoy Waitress!

- Modified clear_untrusted_proxy_headers to be usable without a

- Modified trusted_proxy_count to error when used without a

- Fixed logic to no longer warn on writes where the output is required to have
  a body but there may not be any data to be written. Solves issue posted on
  the Pylons Project mailing list with 1.2.0b1.

Happy New Year!

- Setting the trusted_proxy setting to '*' (wildcard) will allow all
  upstreams to be considered trusted proxies, thereby allowing services behind
  Cloudflare/ELBs to function correctly whereby there may not be a singular IP
  address that requests are received from.

  Using this setting is potentially dangerous if your server is also available
  from anywhere on the internet, and further protections should be used to lock
  down access to Waitress.

- Waitress has increased its support of the X-Forwarded-* headers and includes
  Forwarded (RFC7239) support. This may be used to allow proxy servers to
  influence the WSGI environment.

  This also provides a new security feature when using Waitress behind a proxy
  in that it is possible to remove untrusted proxy headers thereby making sure
  that downstream WSGI applications don't accidentally use those proxy headers
  to make security decisions.

  The documentation has more information, see the following new arguments:

  - trusted_proxy_count
  - trusted_proxy_headers
  - clear_untrusted_proxy_headers
  - log_untrusted_proxy_headers (useful for debugging)

  Be aware that the defaults for these are currently backwards compatible with
  older versions of Waitress, this will change in a future release of waitress.
  If you expect to need this behaviour please explicitly set these variables in
  your configuration, or pin this version of waitress.

  https://docs.pylonsproject.org/projects … proxy.html

- Waitress can now accept a list of sockets that are already pre-bound rather
  than creating its own to allow for socket activation. Support for init
  systems/other systems that create said activated sockets is not included.

- Server header can be omitted by specifying ident=None or ident=''.

- Waitress will no longer send Transfer-Encoding or Content-Length for 1xx,
  204, or 304 responses, and will completely ignore any message body sent by
  the WSGI application, making sure to follow the HTTP standard.

- Waitress has now "vendored" asyncore into itself as waitress.wasyncore.
  This is to cope with the eventuality that asyncore will be removed from
  the Python standard library in 3.8 or so.

- Bring in documentation of paste.translogger from Pyramid. Reorganize and
  clean up documentation.
   2017-10-16 14:07:25 by Adam Ciarcinski | Files touched by this commit (3) | Package updated
Log message:
py-waitress: update to 1.1.0


* Waitress now has a __main__ and thus may be called with python -mwaitress

* Waitress no longer allows lowercase HTTP verbs. This change was made to fall \ 
in line with most HTTP servers.
* When receiving non-ascii bytes in the request URL, waitress will no longer \ 
abruptly close the connection, instead returning a 400 Bad Request.
   2017-07-09 23:24:24 by Adam Ciarcinski | Files touched by this commit (4)
Log message:

- Python 3.6 is now officially supported in Waitress

- Add a work-around for libc issue on Linux not following the documented
  standards. If getnameinfo() fails because of DNS not being available it
  should return the IP address instead of the reverse DNS entry, however
  instead getnameinfo() raises. We catch this, and ask getnameinfo()
  for the same information again, explicitly asking for IP address instead of
  reverse DNS hostname.
   2016-06-08 19:43:49 by Thomas Klausner | Files touched by this commit (356)
Log message: