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HAProxy OCSP Stapling Updater

This script extracts and queries the OCSP server present in a certificate to obtain its revocation status, then updates HAProxy by writing the '.issuer' and the '.ocsp' files and by sending it the set ssl ocsp-response command through the local UNIX admin socket.

Usage

hapos-upd [options] --cert crt_full_path

The crt_full_path argument is the full path to the certificate bundle
used in haproxy 'crt' setting. End-entity (EE) certificate plus any
intermediate CA certificates must be concatenated there.
An OCSP query is sent to the OCSP server given on the command line
(--ocsp-url and --ocsp-host argument); if these arguments are missing,
URL and Host header values are automatically extracted from the
certificate.
If the '.issuer' file already exists it's used to build the OCSP
request, otherwise the chain is extracted from crt_full_path and used
to identify the issuer.
Finally, it writes the related '.issuer' and .'ocsp' files and updates
haproxy, using 'socat' and the local UNIX socket (--socket argument,
default /run/haproxy/admin.sock).

Exit codes:
 0       OK
 1       openssl certificates handling error
 2       OCSP server URL not found
 3       string parsing / PEM manipulation error
 4       OCSP error
 5       haproxy management error
 9       program error (wrong arguments, missing dependencies)

Options:

 -d, --debug           : don't do anything, print debug messages only.

     --keep-temp       : keep temporary directory after exiting (for
                         debug purposes).

 -g, --good-only       : do not update haproxy if OCSP response
                         certificate status value is not 'good'.

 -l, --syslog priority : log errors to syslog system log module.
                         The priority may be specified numerically
                         or as a facility.level pair (e.g.
                         local7.error).

     --ocsp-url url    : OCSP server URL; use this instead of the
                         one in the EE certificate.

     --ocsp-host host  : OCSP server hostname to be used in the
                         'Host:' header; use this instead of the one
                         extracted from the OCSP server URL.

 -s, --socket file     : haproxy admin socket. If omitted,
                         /run/haproxy/admin.sock is used by default.
                         This script is distributed with only one
                         method to update haproxy: using 'socat'
                         with a local admin-level UNIX socket.
                         Feel free to implement other mechanisms as
                         needed! The right section in the code is
                         "UPDATE HAPROXY", at the end of the script.

 -v, --VAfile file     : same as the openssl ocsp -VAfile option
                         with 'file' as argument. For more details:
                         'man ocsp'.
                         If file = "-" then the chain extracted
                         from the certificate's bundle (or .issuer
                         file) is used (useful for OCSP responses
                         that don't include the signer certificate).

      --noverify       : Do not verify OCSP response.

 -S, --skip-update     : Do not notify haproxy of the new OCSP response.

 -h, --help            : this help.

Examples

Extract OCSP server information from site.pem and use them to create /etc/haproxy/site.pem.issuer and /etc/haproxy/site.pem.ocsp, then update HAProxy via default local UNIX socket (/run/haproxy/admin.sock):

:~$ hapos-upd --cert /etc/haproxy/site.pem

Download the certificate (EE + intermediate) used by github.com, then run a debug execution on it:

:~$ echo "" | openssl s_client -connect github.com:443 -showcerts 2>/dev/null | sed -n -e "/-----BEGIN CERTIFICATE/,/-----END CERTIFICATE/p" > github.com.pem
:~$ ./hapos-upd --cert github.com.pem -d --VAfile -
Temporary directory: /tmp/hapos-upd.MV7LJsQPXd
OCSP server URL found: http://ocsp.digicert.com
OCSP server hostname: ocsp.digicert.com
Extracting chain from certificates bundle
EE certificate's fingerprint: SHA1 Fingerprint=A0:C4:A7:46:00:ED:A7:2D:C0:BE:CB:9A:8C:B6:07:CA:58:EE:74:5E
2 certificates found in the bundle
Bundle certificate n. 1 fingerprint: SHA1 Fingerprint=A0:C4:A7:46:00:ED:A7:2D:C0:BE:CB:9A:8C:B6:07:CA:58:EE:74:5E - EE certificate
Bundle certificate n. 2 fingerprint: SHA1 Fingerprint=7E:2F:3A:4F:8F:E8:FA:8A:57:30:AE:CA:02:96:96:63:7E:98:6F:3F - it's part of the chain
OCSP response verification results: Response verify OK
OCSP response: /tmp/hapos-upd.MV7LJsQPXd/ee.pem: good
        This Update: Apr 17 12:29:00 2015 GMT
        Next Update: Apr 24 12:44:00 2015 GMT
Debug mode: haproxy update skipped.

Author

Pier Carlo Chiodi - http://pierky.com

Blog: http://blog.pierky.com Twitter: @pierky