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Bug 1949621 - In renegotiated handshake openssl sends extensions which client didn't advertise in second ClientHello [rhel-9]
Summary: In renegotiated handshake openssl sends extensions which client didn't advert...
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: openssl
Version: 9.0
Hardware: Unspecified
OS: Unspecified
low
low
Target Milestone: beta
: 9.0 Beta
Assignee: Dmitry Belyavskiy
QA Contact: Hubert Kario
URL:
Whiteboard:
Depends On:
Blocks: 1965362
TreeView+ depends on / blocked
 
Reported: 2021-04-14 16:51 UTC by Hubert Kario
Modified: 2021-12-07 21:28 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: No Doc Update
Doc Text:
Clone Of:
: 1965362 (view as bug list)
Environment:
Last Closed: 2021-12-07 21:24:13 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github openssl openssl issues 14875 0 None open During renegotiation OpenSSL sends in ServerHello an extension not advertised by client in the second ClientHello 2021-04-14 16:56:48 UTC
Red Hat Issue Tracker CRYPTO-5642 0 None None None 2021-12-02 14:40:44 UTC

Description Hubert Kario 2021-04-14 16:51:24 UTC 
Description of problem:
When client omits ec_point_formats extension in 2nd ClientHello, during renegotiation, the server still sends in the Server Hello.

This is violation of requirements from Section 7.4.1.4 of RFC 5246.

Version-Release number of selected component (if applicable):
openssl-1.1.1g-15.el8_3.x86_64

How reproducible:
always

Steps to Reproduce:
1. openssl req -x509 -newkey rsa -keyout /tmp/localhost.key -out /tmp/localhost.crt -subj /CN=localhost -nodes -batch
2. openssl s_server -key /tmp/localhost.key -cert /tmp/localhost.crt -www 2>server.err >server.out &
3. PYTHONPATH=. python scripts/test-renegotiation-changed-clienthello.py -d

Actual results:
drop ec_point_formats in renegotiation ...
Error encountered while processing node ExpectServerHello(description='second handshake') (child: <tlsfuzzer.expect.ExpectCertificate object at 0x7f63619a1ac8>) with last message being: <tlslite.messages.Message object at 0x7f63616f5fd0>
Error while processing
Traceback (most recent call last):
  File "tlsfuzzer/scripts/test-renegotiation-changed-clienthello.py", line 408, in main
    runner.run()
  File "/tmp/tmp.bHh2uLYuSt/tlsfuzzer/tlsfuzzer/runner.py", line 239, in run
    node.process(self.state, msg)
  File "/tmp/tmp.bHh2uLYuSt/tlsfuzzer/tlsfuzzer/expect.py", line 743, in process
    self._process_extensions(state, cln_hello, srv_hello)
  File "/tmp/tmp.bHh2uLYuSt/tlsfuzzer/tlsfuzzer/expect.py", line 630, in _process_extensions
    .toStr(ext_id)))
AssertionError: Server sent unadvertised extension of type ec_point_formats


Expected results:
drop ec_point_formats in renegotiation ...
OK

Additional info:
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