mirror of
https://github.com/square/certigo.git
synced 2026-10-20 18:20:33 +00:00
71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
// Copyright 2025 Block, Inc.
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// SPDX-License-Identifier: Apache-2.0
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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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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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"strconv"
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)
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func dumpTLSConnStateFromFTP(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 := readFTP(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 != 220 {
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return nil, fmt.Errorf("FTP server responded with status %d, was expecting 220", status)
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}
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fmt.Fprintf(conn, "AUTH TLS\r\n")
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status, err = readFTP(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 != 234 {
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return nil, fmt.Errorf("FTP server responded with status %d, was expecting 234", 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 readFTP(conn *net.TCPConn) (int, 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 0, err
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}
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if len(response) <= 3 {
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return 0, fmt.Errorf("Error parsing ftp protocol: Status code too short: '%s'", response)
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}
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return strconv.Atoi(response[:3])
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}
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