mirror of
https://github.com/square/certigo.git
synced 2024-04-21 12:32:40 +00:00
68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
/*-
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* Copyright 2017 Square Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package starttls
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import (
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"bufio"
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"crypto/tls"
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"fmt"
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"net"
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)
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func dumpTLSConnStateFromIMAP(dialer Dialer, address string, config *tls.Config) (*tls.ConnectionState, error) {
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c, err := dialer.Dial("tcp", address)
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if err != nil {
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return nil, err
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}
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conn := c.(*net.TCPConn)
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status, err := readIMAP(conn)
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if err != nil {
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return nil, err
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}
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if status != "OK" {
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return nil, fmt.Errorf("IMAP server responded with %s, was expecting OK", status)
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}
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fmt.Fprintf(conn, "1 STARTTLS\r\n")
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status, err = readIMAP(conn)
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if err != nil {
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return nil, err
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}
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if status != "OK" {
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return nil, fmt.Errorf("IMAP server responded with %s, was expecting OK", status)
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}
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tlsConn := tls.Client(conn, config)
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err = tlsConn.Handshake()
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if err != nil {
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return nil, err
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}
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state := tlsConn.ConnectionState()
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return &state, nil
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}
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func readIMAP(conn *net.TCPConn) (string, error) {
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reader := bufio.NewReader(conn)
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response, err := reader.ReadString('\n')
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if err != nil {
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return "", err
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}
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return response[2:4], nil
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}
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