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authorArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
committerArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
commit3e4d8f433239c40311037616b1b8833a06651ae0 (patch)
tree98ab7fce0d011d34677b0beb762d389cb5c39199 /openvpn/contrib/OCSP_check/OCSP_check.sh
Initial import
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+#!/bin/sh
+
+# Sample script to perform OCSP queries with OpenSSL
+# given a certificate serial number.
+
+# If you run your own CA, you can set up a very simple
+# OCSP server using the -port option to "openssl ocsp".
+
+# Full documentation and examples:
+# http://www.openssl.org/docs/apps/ocsp.html
+
+
+# Edit the following values to suit your needs
+
+# OCSP responder URL (mandatory)
+# YOU MUST UNCOMMENT ONE OF THESE AND SET IT TO A VALID SERVER
+#ocsp_url="http://ocsp.example.com/"
+#ocsp_url="https://ocsp.secure.example.com/"
+
+# Path to issuer certificate (mandatory)
+# YOU MUST SET THIS TO THE PATH TO THE CA CERTIFICATE
+issuer="/path/to/CAcert.crt"
+
+# use a nonce in the query, set to "-no_nonce" to not use it
+nonce="-nonce"
+
+# Verify the response
+# YOU MUST SET THIS TO THE PATH TO THE RESPONSE VERIFICATION CERT
+verify="/path/to/CAcert.crt"
+
+# Depth in the certificate chain where the cert to verify is.
+# Set to -1 to run the verification at every level (NOTE that
+# in that case you need a more complex script as the various
+# parameters for the query will likely be different at each level)
+# "0" is the usual value here, where the client certificate is
+check_depth=0
+
+cur_depth=$1 # this is the *CURRENT* depth
+common_name=$2 # CN in case you need it
+
+# minimal sanity checks
+
+err=0
+if [ -z "$issuer" ] || [ ! -e "$issuer" ]; then
+ echo "Error: issuer certificate undefined or not found!" >&2
+ err=1
+fi
+
+if [ -z "$verify" ] || [ ! -e "$verify" ]; then
+ echo "Error: verification certificate undefined or not found!" >&2
+ err=1
+fi
+
+if [ -z "$ocsp_url" ]; then
+ echo "Error: OCSP server URL not defined!" >&2
+ err=1
+fi
+
+if [ $err -eq 1 ]; then
+ echo "Did you forget to customize the variables in the script?" >&2
+ exit 1
+fi
+
+# begin
+if [ $check_depth -eq -1 ] || [ $cur_depth -eq $check_depth ]; then
+
+ eval serial="\$tls_serial_${cur_depth}"
+
+ # To successfully complete, the following must happen:
+ #
+ # - The serial number must not be empty
+ # - The exit status of "openssl ocsp" must be zero
+ # - The output of the above command must contain the line
+ # "0x${serial}: good"
+ #
+ # Everything else fails with exit status 1.
+
+ if [ -n "$serial" ]; then
+
+ # This is only an example; you are encouraged to run this command (without
+ # redirections) manually against your or your CA's OCSP server to see how
+ # it responds, and adapt accordingly.
+ # Sample output that is assumed here:
+ #
+ # Response verify OK
+ # 0x428740A5: good
+ # This Update: Apr 24 19:38:49 2010 GMT
+ # Next Update: May 2 14:23:42 2010 GMT
+ #
+ # NOTE: It is needed to check the exit code of OpenSSL explicitly. OpenSSL
+ # can in some circumstances give a "good" result if it could not
+ # reach the the OSCP server. In this case, the exit code will indicate
+ # if OpenSSL itself failed or not. If OpenSSL's exit code is not 0,
+ # don't trust the OpenSSL status.
+
+ status=$(openssl ocsp -issuer "$issuer" \
+ "$nonce" \
+ -CAfile "$verify" \
+ -url "$ocsp_url" \
+ -serial "0x${serial}" 2>/dev/null)
+
+ if [ $? -eq 0 ]; then
+ # check that it's good
+ if echo "$status" | grep -Fq "0x${serial}: good"; then
+ exit 0
+ fi
+ fi
+ fi
+ # if we get here, something was wrong
+ exit 1
+fi