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Bug 106168 - curl https fails to match subjectAltName server certificates
curl https fails to match subjectAltName server certificates
Product: Red Hat Linux
Classification: Retired
Component: curl (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Ivana Varekova
David Lawrence
Depends On:
  Show dependency treegraph
Reported: 2003-10-03 09:30 EDT by Neil Dunbar
Modified: 2007-04-18 12:58 EDT (History)
0 users

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2006-01-09 05:28:29 EST
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
unified diff patch against RPM curl-7.9.5-2.rpm (should be Patch1 in spec) (5.29 KB, patch)
2003-10-03 09:33 EDT, Neil Dunbar
no flags Details | Diff
Patch redone for 7.10.6 (6.28 KB, patch)
2003-10-08 12:25 EDT, Eido Inoue
no flags Details | Diff

  None (edit)
Description Neil Dunbar 2003-10-03 09:30:25 EDT
Description of problem:

curl does not match HTTP over TLS server identity checks (as in RFC 2818)

Version-Release number of selected component (if applicable):

7.9.5 through to 7.10.6 (Rawhide)

How reproducible:

Steps to Reproduce:
1. Connect to a server which does NOT have it's FQDN in the CN component
   of the subject name of the SSL certificate; but whose FQDN IS in a DNS
   subjectAltName component. Ensure that you are using --cacert or --capath
   to force SSL certificate verification.
2. curl will exit, claiming that the server name does not match that in the
Actual results:

Failed connection and error report.

Expected results:

Successful connection and HTML download.

Additional info:

Patch to correct this behaviour (against 7.9.5-2) is attached
Comment 1 Neil Dunbar 2003-10-03 09:33:50 EDT
Created attachment 94912 [details]
unified diff patch against RPM curl-7.9.5-2.rpm (should be Patch1 in spec)

Fixes problem. Code was lifted and translated from the OpenLDAP client
A similar patch has also been submitted to the curl maintenance site on
SourceForge, with a patch against 7.10.6

This code should also patch properly against all the 7.9.x series (ie, in Red
Hat 9), but I haven't tested it.
Comment 2 Eido Inoue 2003-10-07 17:40:00 EDT
I've remerged the patch against 7.10.6. Aside from line # diffs and whitespace,
strequals() needed a curl_ prefix for the newer src. I traced through the code
once and briefly tested and had another SSL/OpenLDAP dev look at the code, but
this needs a look from another party as the code is security related.
Comment 3 Neil Dunbar 2003-10-08 04:35:31 EDT
One further note - one of the curl maintainers (Daniel Sternberg) asked if the
inet_aton and inet_pton functions could be replaced in the patch - since not all
platforms have them (given that they're of BSD 4.3 origin).

I don't think that this is an issue for Linux, which certainly does have them -
but any further patching to curl might want to see if the functionality could be
Comment 4 Eido Inoue 2003-10-08 12:25:17 EDT
Created attachment 95022 [details]
Patch redone for 7.10.6

strequals() is now curl_strequals(). tabs removed from original. Original patch
author notes that the patch may need some modification to compile on non Linux
(ie BSD) systems.

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