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Support Implicit TLS for sending emails (#13317)

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Previously, TLS could only be used with STARTTLS.
Add a new option `force_tls`, where TLS is used from the start.
Implicit TLS is recommended over STARTLS,
see https://datatracker.ietf.org/doc/html/rfc8314

Fixes #8046.

Signed-off-by: Jan Schär <jan@jschaer.ch>
This commit is contained in:
Jan Schär 2022-07-25 17:27:19 +02:00 • committed by GitHub
parent 908aeac44a
commit e8519e0ed2
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5 changed files with 99 additions and 13 deletions
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7
synapse/config/emailconfig.py
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@ -85,14 +85,19 @@ class EmailConfig(Config):
if email_config is None:
email_config = {}
self.force_tls = email_config.get("force_tls", False)
self.email_smtp_host = email_config.get("smtp_host", "localhost")
self.email_smtp_port = email_config.get("smtp_port", 25)
self.email_smtp_port = email_config.get(
"smtp_port", 465 if self.force_tls else 25
)
self.email_smtp_user = email_config.get("smtp_user", None)
self.email_smtp_pass = email_config.get("smtp_pass", None)
self.require_transport_security = email_config.get(
"require_transport_security", False
)
self.enable_smtp_tls = email_config.get("enable_tls", True)
if self.force_tls and not self.enable_smtp_tls:
raise ConfigError("email.force_tls requires email.enable_tls to be true")
if self.require_transport_security and not self.enable_smtp_tls:
raise ConfigError(
"email.require_transport_security requires email.enable_tls to be true"