8000 bpo-44022: Fix http client infinite line reading (DoS) after a http 100 by gen-xu · Pull Request #25916 · python/cpython · GitHub
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bpo-44022: Fix http client infinite line reading (DoS) after a http 100 #25916

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Merged
merged 7 commits into from
May 5, 2021
Merged

bpo-44022: Fix http client infinite line reading (DoS) after a http 100 #25916

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e53f243
bpo-44022: Fix httplib client deny of service with total header size …
gen-xu May 5, 2021
55206e1
📜🤖 Added by blurb_it.
blurb-it[bot] May 5, 2021
d1ac02b
Using provided header reads function to skip.
gen-xu May 5, 2021
362c50d
Fix test_all.
gen-xu May 5, 2021
17941e8
renamed the new function to _read_headers to keep it private.
gpshead May 5, 2021
5ce1a31
no need to exclude read_headers in test_all now.
gpshead May 5, 2021
859cd6e
reword and add ReST formatting.
gpshead May 5, 2021
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renamed the new function to _read_headers to keep it private.
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@gpshead
gpshead authored May 5, 2021
commit 17941e81cf3d189b849b2ac322ed27239727478c
11 changes: 6 additions & 5 deletions Lib/http/client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -202,8 +202,8 @@ def getallmatchingheaders(self, name):
lst.append(line)
return lst

def read_headers(fp):
"""Reads headers into a list from a file pointer.
def _read_headers(fp):
"""Reads potential header lines into a list from a file pointer.

Length of line is limited by _MAXLINE, and number of
headers is limited by _MAXHEADERS.
Expand All @@ -230,7 +230,7 @@ def parse_headers(fp, _class=HTTPMessage):
to parse.

"""
headers = read_headers(fp)
headers = _read_headers(fp)
hstring = b''.join(headers).decode('iso-8859-1')
return email.parser.Parser(_class=_class).parsestr(hstring)

Expand Down Expand Up @@ -318,9 +318,10 @@ def begin(self):
if status != CONTINUE:
break
# skip the header from the 100 response
skip = read_headers(self.fp)
skipped_headers = _read_headers(self.fp)
if self.debuglevel > 0:
print("header:", skip)
print("headers:", skipped_headers)
del skipped_headers

self.code = self.status = status
self.reason = reason.strip()
Expand Down
0