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Bug #13429
closed
Net::SMTP has no read timeout when connexion over TLS
Description
Hello,
When connecting using TLS to an unresponsive SMTP server, Net::SMTP can hang until 10 minutes.
The issue is here, we should have a read timeout:
def tlsconnect(s)
verified = false
s = ssl_socket(s, @ssl_context)
logging "TLS connection started"
s.sync_close = true
s.connect
if @ssl_context.verify_mode != OpenSSL::SSL::VERIFY_NONE
s.post_connection_check(@address)
end
verified = true
s
ensure
s.close unless verified
end
To workaround the issue for the moment I used:
module Net
class SMTP
alias :original_tlsconnect :tlsconnect
def tlsconnect(s)
Timeout.timeout(@read_timeout, Net::ReadTimeout) { original_tlsconnect(s) }
end
end
end
Here the steps to reproduce the bug:
smtp = Net::SMTP.new('mail.example.com', 465)
smtp.read_timeout = 3
smtp.enable_tls
smtp.start('localhost.localdomain', 'medecins@example.com', '********') {}
Sorry for the credentials I can't provide this publicly, after testing with one failing server you will be able to see that the read timeout is ignored.
By failing server I mean an SMTPS server where you are able to open a connection but you can't read on the socket.
Working case:
smtp = Net::SMTP.new('mail.example.com', 465)
smtp.read_timeout = 3
smtp.start('localhost.localdomain', 'medecins@example.com', '********') {}
Without TLS it's ok!
If you have any questions, suggestions just ask, if I can help.
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