/
ssh.go
71 lines (58 loc) · 1.74 KB
/
ssh.go
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/*
* Copyright 2019 EPAM Systems
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package utils
import (
"bytes"
"fmt"
"os/exec"
"regexp"
logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
)
const PublicSSHKeyName = "ssh_known_hosts"
var (
SSHURLRegexp = regexp.MustCompile(`(?P<Users>.+)@(?P<Host>[\w.]+)[/:].*`)
logSSH = logf.Log.WithName("ssh")
)
// TODO: Need to find a better solution.
// url.Parse can't find a host
// url.Parse with git+ssh://url does not evaluate a valid host.
func ExtractHost(gitURL string) (string, error) {
// [0] - full url, [1] - user, [2] - host
gitHost := SSHURLRegexp.FindStringSubmatch(gitURL)[2]
if gitHost == "" {
return "", fmt.Errorf("can't extract host from %s url", gitURL)
}
return gitHost, nil
}
// TODO: Need to find a better solution.
// The best way is use standard library.
func EvaluatePublicKey(sshURL string) (string, error) {
sshHost, err := ExtractHost(sshURL)
if err != nil {
return "", err
}
cmd := exec.Command("ssh-keyscan", sshHost)
var outBuf bytes.Buffer
var errBuf bytes.Buffer
cmd.Stdout = &outBuf
cmd.Stderr = &errBuf
err = cmd.Run()
if err != nil {
logSSH.Error(err, fmt.Sprintf("Stderr: %s", errBuf.String()))
return "", err
}
return outBuf.String(), nil
}