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Support submission (directly) over TLS (submissions/smtps/port 465)

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This patch adds support for TLS-wrapped submission connections.

Instead of clients establishing a connection over plain text and then
using STARTTLS to switch over a TLS connection, this new mode allows the
clients to connect directly over TLS, like it's done in HTTPS.

This is not an official standard yet, but it's reasonably common in
practice, and provides some advantages over the traditional submission
port.

The default port is 465, commonly used for this; chasquid defaults to
systemd file descriptor passing as for the other protocols (for now).
This commit is contained in:
Alberto Bertogli
2017-04-01 12:47:46 +01:00
parent c4255933bd
commit 213bc63a95
22 changed files with 157 additions and 48 deletions
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19
internal/config/config.proto
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@@ -21,17 +21,22 @@ message Config {
// systemd sockets must be named with "FileDescriptorName=submission".
repeated string submission_address = 4;
// Addresses to listen on for submission-over-TLS (usually port 465).
// Default: "systemd", which means systemd passes sockets to us.
// systemd sockets must be named with "FileDescriptorName=submission_tls".
repeated string submission_over_tls_address = 5;
// Address for the monitoring http server.
// Do NOT expose this to the public internet.
// Default: no monitoring http server.
string monitoring_address = 5;
string monitoring_address = 6;
// Mail delivery agent (MDA, also known as LDA) to use.
// This should point to the binary to use to deliver email to local users.
// The content of the email will be passed via stdin.
// If it exits unsuccessfully, we assume the mail was not delivered.
// Default: "maildrop".
string mail_delivery_agent_bin = 6;
string mail_delivery_agent_bin = 7;
// Command line arguments for the mail delivery agent. One per argument.
// Some replacements will be done.
@@ -45,11 +50,11 @@ message Config {
//
// Default: "-f", "%from%", "-d", "%to_user%" (adequate for procmail
// and maildrop).
repeated string mail_delivery_agent_args = 7;
repeated string mail_delivery_agent_args = 8;
// Directory where we store our persistent data.
// Default: "/var/lib/chasquid"
string data_dir = 8;
string data_dir = 9;
// Suffix separator, to perform suffix removal of local users.
// For example, if you set this to "-+", email to local user
@@ -57,17 +62,17 @@ message Config {
// Including "+" is strongly encouraged, as it is assumed for email
// forwarding.
// Default: "+".
string suffix_separators = 9;
string suffix_separators = 10;
// Characters to drop from the user part on local emails.
// For example, if you set this to "._", email to local user
// "u.se_r" will be delivered to "user".
// Default: ".".
string drop_characters = 10;
string drop_characters = 11;
// Path where to write the mail log to.
// If "<syslog>", log using the syslog (at MAIL|INFO priority).
// Default: <syslog>
string mail_log_path = 11;
string mail_log_path = 12;
}