[Bug 205011] openssl: verify error:num=20:unable to get local issuer certificate
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Fri Dec 4 08:58:07 UTC 2015
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205011
Bug ID: 205011
Summary: openssl: verify error:num=20:unable to get local
issuer certificate
Product: Base System
Version: 10.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: bin
Assignee: freebsd-bugs at FreeBSD.org
Reporter: oliver at openbrackets.net
The openssl in 10.1 release fails to verify some server certificates using
/usr/local/share/certs/ca-root-nss.crt. FreeBSD 10 & 10.2 both work fine. This
may be an upstream issue with openssl, but I have not been able to find any
reported issues.
To Reproduce:
$ openssl s_client -connect api.textmarketer.co.uk:443
depth=2 C = US, O = "thawte, Inc.", OU = Certification Services
Division, OU = "(c) 2006 thawte, Inc. - For authorized use only", CN =
thawte Primary Root CA
verify error:num=20:unable to get local issuer certificate
...
The same command on 10.2 (or 10) results in:
$ openssl s_client -connect api.textmarketer.co.uk:443
depth=2 C = US, O = "thawte, Inc.", OU = Certification Services Division, OU =
"(c) 2006 thawte, Inc. - For authorized use only", CN = thawte Primary Root CA
verify return:1
...
This error message is widely reported as being due to path issues to the CA
bundle. In fact on 10.1 a similar command even fails to verify other server
certs with a different root CA:
$openssl s_client -connect google.com:443
depth=3 C = US, O = Equifax, OU = Equifax Secure Certificate Authority
verify error:num=20:unable to get local issuer certificate
However the google.com Equifax secure root CA can be made to work with 10.1 if
you specify the -CAfile
$ openssl s_client -CAfile /usr/local/share/certs/ca-root-nss.crt -connect
google.com:443
depth=3 C = US, O = Equifax, OU = Equifax Secure Certificate Authority
verify return:1
This is NOT the case for the original Thawte example:
$ openssl s_client -CAfile /usr/local/share/certs/ca-root-nss.crt -connect
api.textmarketer.co.uk:443
depth=2 C = US, O = "thawte, Inc.", OU = Certification Services
Division, OU = "(c) 2006 thawte, Inc. - For authorized use only", CN =
thawte Primary Root CA
verify error:num=20:unable to get local issuer certificate
On FreeBSD 10 or 10.2 all CA root certs tested verify fine, with the default
install without the need for CAfile.
Having to pass -CAfile might be acceptable, as this is just a "packaging and OS
integration issue on paths", however the fact that even with the correct
-CAfile SOME root certs do NOT verify, leads me to believe that something more
fundamental is broken with the openssl version in FreeBSD 10.1, which is:
OpenSSL 1.0.1l-freebsd 15 Jan 2015
This was tested and verified on a clean install of 10.1-RELEASE.
(NOTE: openssl from ports also works fine, even on 10.1, this report is about
the openssl in the base system).
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