OCSP-stapling enhancement and testing.

Server:
  Honor environment variable as well as running_in_test_harness in permitting bogus staplings
  Update server tests
  Add "-ocsp" option to client-ssl.
  Server side: add verification of stapled status.
  First cut server-mode ocsp testing.
  Fix some uninitialized ocsp-related data.

Client (new):
  Verify stapling using only the chain that verified the server cert, not any acceptable chain.
  Add check for multiple responses in a stapling, which is not handled
  Refuse verification on expired and revoking staplings.
  Handle OCSP client refusal on lack of stapling from server.
  More fixing in client OCSP: use the server cert signing chain to verify the OCSP info.
  Add transport hosts_require_ocsp option.
  Log stapling responses.
  Start on tests for client-side.

Testing support:
    Add CRL generation code and documentation update
    Initial CA & certificate set for testing.

BUGFIX:
    Once a single OCSP response has been extracted the validation
    routine return code is no longer about the structure, but the actual
    returned OCSP status.

1 files changed, 66 insertions, 0 deletions

diff --git a/test/confs/5600 b/test/confs/5600
new file mode 100644
index 000000000..8b26ee7fa
--- /dev/null
+++ b/test/confs/5600
@@ -0,0 +1,66 @@
+# Exim test configuration 5600
+# OCSP stapling, server
+
+CRL=
+
+exim_path = EXIM_PATH
+host_lookup_order = bydns
+primary_hostname = server1.example.com
+rfc1413_query_timeout = 0s
+spool_directory = DIR/spool
+log_file_path = DIR/spool/log/%slog
+gecos_pattern = ""
+gecos_name = CALLER_NAME
+
+# ----- Main settings -----
+
+acl_smtp_rcpt = check_recipient
+
+log_selector = +tls_peerdn
+
+queue_only
+queue_run_in_order
+
+tls_advertise_hosts = *
+
+tls_certificate = DIR/aux-fixed/exim-ca/example.com/server1.example.com/server1.example.com.pem
+tls_privatekey = DIR/aux-fixed/exim-ca/example.com/server1.example.com/server1.example.com.unlocked.key
+
+tls_verify_hosts = HOSTIPV4
+tls_try_verify_hosts = *
+tls_verify_certificates = DIR/aux-fixed/cert2
+tls_crl = CRL
+tls_ocsp_file = OCSP
+
+
+# ------ ACL ------
+
+begin acl
+
+check_recipient:
+  deny     message = certificate not verified: peerdn=$tls_peerdn
+         ! verify = certificate
+  accept
+
+
+# ----- Routers -----
+
+begin routers
+
+abc:
+  driver = accept
+  retry_use_local_part
+  transport = local_delivery
+
+
+# ----- Transports -----
+
+begin transports
+
+local_delivery:
+  driver = appendfile
+  file = DIR/test-mail/$local_part
+  headers_add = TLS: cipher=$tls_cipher peerdn=$tls_peerdn
+  user = CALLER
+
+# End