diff options
Diffstat (limited to 'doc/doc-txt/experimental-spec.txt')
| -rw-r--r-- | doc/doc-txt/experimental-spec.txt | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt index f21609662..16738a51f 100644 --- a/doc/doc-txt/experimental-spec.txt +++ b/doc/doc-txt/experimental-spec.txt @@ -69,7 +69,8 @@ starts retrying to fetch an OCSP proof some time before its current proof expires. The downside is that it requires server support. If Exim is built with EXPERIMENTAL_OCSP and it was built with OpenSSL, -then it gains a new global option: "tls_ocsp_file". +or with GnuTLS 3.1.3 or later, then it gains a new global option: +"tls_ocsp_file". The file specified therein is expected to be in DER format, and contain an OCSP proof. Exim will serve it as part of the TLS handshake. This @@ -86,7 +87,7 @@ next connection. Exim will check for a valid next update timestamp in the OCSP proof; if not present, or if the proof has expired, it will be ignored. -Also, given EXPERIMENTAL_OCSP and OpenSSL, the smtp transport gains +Also, given EXPERIMENTAL_OCSP, the smtp transport gains a "hosts_require_ocsp" option; a host-list for which an OCSP Stapling is requested and required for the connection to proceed. The host(s) should also be in "hosts_require_tls", and "tls_verify_certificates" @@ -99,6 +100,9 @@ of the server certificate. There may be zero or one such. These intermediate certificates should be added to the server OCSP stapling file (named by tls_ocsp_file). +Note that the proof only covers the terminal server certificate, +not any of the chain from CA to it. + At this point in time, we're gathering feedback on use, to determine if it's worth adding complexity to the Exim daemon to periodically re-fetch OCSP files and somehow handling multiple files. @@ -107,8 +111,8 @@ OCSP files and somehow handling multiple files. OCSP server is supplied. The server URL may be included in the server certificate, if the CA is helpful. - One fail mode seen was the OCSP Signer cert expiring before the end - of vailidity of the OCSP proof. The checking done by Exim/OpenSSL + One failure mode seen was the OCSP Signer cert expiring before the end + of validity of the OCSP proof. The checking done by Exim/OpenSSL noted this as invalid overall, but the re-fetch script did not. |