X-Git-Url: https://git.exim.org/users/heiko/exim.git/blobdiff_plain/594706ea2e56fe8c972eab772bd3e58c7a0c89ab..d567a64d80184840c08ca4a016a979233f09ec23:/doc/doc-txt/experimental-spec.txt diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt index c060a6c5a..769f0229d 100644 --- a/doc/doc-txt/experimental-spec.txt +++ b/doc/doc-txt/experimental-spec.txt @@ -767,82 +767,83 @@ and (for SMTP transports) a second string on deferrals caused by a host error. This feature may be used, for example, to write exim internal log information (not available otherwise) into a database. -In order to use the feature, you must set +In order to use the feature, you must compile with EXPERIMENTAL_TPDA=yes in your Local/Makefile -and define the expandable strings in the runtime config file, to -be executed at end of delivery. +and define the tpda_event_action option in the transport, to +be expanded when the event fires. -Additionally, there are 6 more variables, available at end of -delivery: +A new variable, $tpda_event, is set to the event type when the +expansion is done. The current list of events is: -tpda_delivery_ip IP of host, which has accepted delivery -tpda_delivery_port Port of remote host which has accepted delivery -tpda_delivery_fqdn FQDN of host, which has accepted delivery -tpda_delivery_local_part local part of address being delivered -tpda_delivery_domain domain part of address being delivered -tpda_delivery_confirmation SMTP confirmation message + msg:delivery + msg:host:defer + tcp:connect + tcp:close + tls:cert + smtp:connect -In case of a deferral caused by a host-error: -tpda_defer_errno Error number -tpda_defer_errstr Error string possibly containing more details +The expansion is called for all event types, and should use the $tpda_event +value to decide when to act. The variable data is a colon-separated +list, describing an event tree. -The $router_name and $transport_name variables are also usable. +There is an auxilary variable, $tpda_data, for which the +content is event_dependent: + msg:delivery smtp confirmation mssage + msg:host:defer error string + tls:cert verification chain depth + smtp:connect smtp banner -To take action after successful deliveries, set the following option -on any transport of interest. +The msg:host:defer event populates one extra variable, $tpda_defer_errno. + +The following variables are likely to be useful for most event types: + + router_name, transport_name + local_part, domain + host, host_address, host_port + tls_out_peercert + lookup_dnssec_authenticated, tls_out_dane + sending_ip_address, sending_port -tpda_delivery_action An example might look like: -tpda_delivery_action = \ -${lookup pgsql {SELECT * FROM record_Delivery( \ +tpda_event_action = ${if = {msg:delivery}{$tpda_event} \ +{${lookup pgsql {SELECT * FROM record_Delivery( \ '${quote_pgsql:$sender_address_domain}',\ '${quote_pgsql:${lc:$sender_address_local_part}}', \ - '${quote_pgsql:$tpda_delivery_domain}', \ - '${quote_pgsql:${lc:$tpda_delivery_local_part}}', \ - '${quote_pgsql:$tpda_delivery_ip}', \ - '${quote_pgsql:${lc:$tpda_delivery_fqdn}}', \ - '${quote_pgsql:$message_exim_id}')}} + '${quote_pgsql:$domain}', \ + '${quote_pgsql:${lc:$local_part}}', \ + '${quote_pgsql:$host_address}', \ + '${quote_pgsql:${lc:$host}}', \ + '${quote_pgsql:$message_exim_id}')}} \ +} {}} The string is expanded after the delivery completes and any side-effects will happen. The result is then discarded. Note that for complex operations an ACL expansion can be used. +During the expansion the tpda_event variable will contain the +string-list "msg:delivery". + -In order to log host deferrals, add the following option to an SMTP -transport: +The expansion of the tpda_event_action option should normally +return an empty string. Should it return anything else the +following will be forced: -tpda_host_defer_action + msg:delivery (ignored) + msg:host:defer (ignored) + tcp:connect do not connect + tcp:close (ignored) + tls:cert refuse verification + smtp:connect close connection -This is a private option of the SMTP transport. It is intended to -log failures of remote hosts. It is executed only when exim has -attempted to deliver a message to a remote host and failed due to -an error which doesn't seem to be related to the individual -message, sender, or recipient address. -See section 47.2 of the exim documentation for more details on how -this is determined. -Example: -tpda_host_defer_action = \ -${lookup mysql {insert into delivlog set \ - msgid = '${quote_mysql:$message_exim_id}', \ - senderlp = '${quote_mysql:${lc:$sender_address_local_part}}', \ - senderdom = '${quote_mysql:$sender_address_domain}', \ - delivlp = '${quote_mysql:${lc:$tpda_delivery_local_part}}', \ - delivdom = '${quote_mysql:$tpda_delivery_domain}', \ - delivip = '${quote_mysql:$tpda_delivery_ip}', \ - delivport = '${quote_mysql:$tpda_delivery_port}', \ - delivfqdn = '${quote_mysql:$tpda_delivery_fqdn}', \ - deliverrno = '${quote_mysql:$tpda_defer_errno}', \ - deliverrstr = '${quote_mysql:$tpda_defer_errstr}' \ - }} Redis Lookup @@ -1236,24 +1237,25 @@ The use of OCSP-stapling should be considered, allowing for fast revocation of certificates (which would otherwise be limited by the DNS TTL on the TLSA records). However, this is likely to only be usable with DANE_TA. NOTE: the -default is to request OCSP for all hosts; the certificate -chain in DANE_EE usage will be insufficient to validate -the OCSP proof and verification will fail. Either disable -OCSP completely or use the (new) variable $tls_out_tlsa_usage -like so: - - hosts_request_ocsp = ${if or { {= {4}{$tls_out_tlsa_usage}} \ - {= {0}{$tls_out_tlsa_usage}} } \ +default of requesting OCSP for all hosts is modified iff +DANE is in use, to: + + hosts_request_ocsp = ${if or { {= {0}{$tls_out_tlsa_usage}} \ + {= {4}{$tls_out_tlsa_usage}} } \ {*}{}} -The variable is a bitfield with numbered bits set for TLSA -record usage codes. The zero above means DANE was not in use, + +The (new) variable $tls_out_tlsa_usage is a bitfield with +numbered bits set for TLSA record usage codes. +The zero above means DANE was not in use, the four means that only DANE_TA usage TLSA records were found. If the definition of hosts_require_ocsp or hosts_request_ocsp includes the string "tls_out_tlsa_usage", they are re-expanded in time to control the OCSP request. -[ All a bit complicated. Should we make that definition -the default? Should we override the user's definition? ] +This modification of hosts_request_ocsp is only done if +it has the default value of "*". Admins who change it, and +those who use hosts_require_ocsp, should consider the interaction +with DANE in their OCSP settings. For client-side DANE there are two new smtp transport options,