Hi, I am new to the list and have a question where it seems I cannot find
the answer in archives here or in other sources.
We want to verify the certificate chain of an "official" certificate, but
including the revocation status of the intermediate certs, via CRL or
OCSP.
(The chain verification itself is easy and solved, our problems lie just
with getting the revocation status of an arbitrary certificate).
It seems to turn out that a) this is seldom done completely (otherwise I
think there would be more "working recipes") and it is not easy to do it
in a generic way as we keep getting various errors at different steps.
Wtihout making it too long, we want to do the following:
a) retrieve and save certificate from server via URL
b)retrieve and save certificate chain from server
c) determine OCSP URL or CRL list URL
d1) verify cert against OCSP source OR
d2) download CRL; then verify cert against CRL
Up to c), everything is straightforward. We use openssl 1.0.1e-60.el7 from
current CentOS 7.
try this:
CAFILE=/etc/pki/certs/ca-bundle.trust.crt
CERT=/tmp/cert.crt <-- cert to validate
ISSUER=/tmp/issuer.crt <-- issuing ca cert
OCSPURL=$(openssl x509 -in $CERT -noout -ocsp_uri)
OCSPHOST=$(echo "$OCSPURL" |gawk --field-separator=\/ '{ print $3 }' -)
OCSPRESULT=$(openssl ocsp -CAfile $CAFILE -no_nonce -noverify -issuer
$ISSUER -cert $CERT -url "$OCSPURL" -header Host $OCSPHOST |grep "$CERT")
Thank you, we will try this, will probably take a couple of days.
Regards, Jakob Curdes
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