Support key based authentication

.talismanrc

@@ -1,3 +1,11 @@
 fileignoreconfig:
-- filename: pkg/config/config.go
-  checksum: 3d4547bb16555a9afb9277fa6d475c97f295d69b2eb9f000c9d89501f90f8c8c
+- filename: sftp/ssh/key_with_passphrase.pub
+  checksum: f54d3e10f89dcec5c69bba33c5bbadff2b0241306af8ce37f7b5695080ccdea2
+- filename: sftp/ssh/key_without_passphrase.pub
+  checksum: 2ec64dcc1725d82c1b1bce8a9769dd6effcb785ceb6682471d9f30d932abf64f
+- filename: sftp/ssh/key_without_passphrase
+  checksum: 2e5bc6583ffed56355367c75bc533e57ceb19e31d1ecc44516189074e55a5142
+- filename: sftp/ssh/key_with_passphrase
+  checksum: f59431b0b023ff7e9b85830121e8869da1fc5780d809ecfb0a28843239cac578
+- filename: pkg/client/sftp_client.go
+  checksum: 0100aeebda7fff385ed63faf81eebbcc958433d0474e299dc31bf11eb66a1905

cmd/root.go

@@ -21,6 +21,7 @@ var rootCmd = &cobra.Command{
 	Short: "",
 	Long:  "",
 	Run: func(cmd *cobra.Command, args []string) {
+		log.Debugf("config dump: %+v\n", cfg)
 		if err := server.Start(cfg); err != nil {
 			log.WithFields(log.Fields{"event": "starting server"}).Fatal(err)
 		}

pkg/client/sftp_client.go

@@ -2,6 +2,7 @@ package client
 
 import (
 	"fmt"
+	"github.com/arunvelsriram/sftp-exporter/pkg/utils"
 
 	log "github.com/sirupsen/logrus"
 
@@ -49,13 +50,70 @@ func (d defaultSFTPClient) FSStat() (*model.FSStat, error) {
 	}, nil
 }
 
+func parsePrivateKey(key, keyPassphrase []byte) (parsedKey ssh.Signer, err error) {
+	if len(keyPassphrase) > 0 {
+		log.Debug("key has passphrase")
+		parsedKey, err = ssh.ParsePrivateKeyWithPassphrase(key, keyPassphrase)
+		if err != nil {
+			log.Error("failed to parse key with passphrase")
+			return nil, err
+		}
+		return parsedKey, err
+	}
+
+	log.Debug("key has no passphrase")
+	parsedKey, err = ssh.ParsePrivateKey(key)
+	if err != nil {
+		log.Error("failed to parse key")
+		return nil, err
+	}
+	return parsedKey, err
+}
+
+func sshAuthMethods(cfg config.Config) ([]ssh.AuthMethod, error) {
+	pass := cfg.GetSFTPPass()
+	key := cfg.GetSFTPKey()
+	keyPassphrase := cfg.GetSFTPKeyPassphrase()
+
+	if len(key) > 0 && utils.IsNotEmpty(pass) {
+		log.Debug("will be authenticating using key and password")
+		parsedKey, err := parsePrivateKey(key, keyPassphrase)
+		if err != nil {
+			return nil, err
+		}
+		return []ssh.AuthMethod{
+			ssh.PublicKeys(parsedKey),
+			ssh.Password(pass),
+		}, nil
+	} else if len(key) > 0 {
+		log.Debug("will be authenticating using key")
+		parsedKey, err := parsePrivateKey(key, keyPassphrase)
+		if err != nil {
+			return nil, err
+		}
+		return []ssh.AuthMethod{
+			ssh.PublicKeys(parsedKey),
+		}, nil
+	} else if utils.IsNotEmpty(pass) {
+		log.Debug("will be authenticating using password")
+		return []ssh.AuthMethod{
+			ssh.Password(pass),
+		}, nil
+	}
+
+	return nil, fmt.Errorf("either one of password or key is required")
+}
+
 func newSFTPClient(cfg config.Config) (SFTPClient, error) {
 	addr := fmt.Sprintf("%s:%d", cfg.GetSFTPHost(), cfg.GetSFTPPort())
+	auth, err := sshAuthMethods(cfg)
+	if err != nil {
+		log.Error("unable to get SSH auth methods")
+		return nil, err
+	}
 	clientConfig := &ssh.ClientConfig{
-		User: cfg.GetSFTPUser(),
-		Auth: []ssh.AuthMethod{
-			ssh.Password(cfg.GetSFTPPass()),
-		},
+		User:            cfg.GetSFTPUser(),
+		Auth:            auth,
 		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
 	}
 

pkg/config/config_test.go

@@ -53,6 +53,7 @@ func (s *ConfigTestSuite) TestConfigLoadConfigPanicsWhenBothKeyAndKeyFileAreGive
 
 	s.PanicsWithValue("only one of sftp_key, sftp_key_file should be provided", func() { config.MustLoadConfig(s.fs) })
 }
+
 func (s *ConfigTestSuite) TestConfigLoadConfigPanicsForInvalidKey() {
 	viper.Set(c.ViperKeySFTPUser, "sftp user")
 	viper.Set(c.ViperKeySFTPKey, "invalid encoding")

sftp/ssh/key_with_passphrase

@@ -1,50 +1,54 @@
------BEGIN OPENSSH PRIVATE KEY-----
-b3BlbnNzaC1rZXktdjEAAAAACmFlczI1Ni1jdHIAAAAGYmNyeXB0AAAAGAAAABC2Jo+Tkj
-r8/fE0QFirunHMAAAAEAAAAAEAAAIXAAAAB3NzaC1yc2EAAAADAQABAAACAQD1dXneJhlY
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-kNAA==
------END OPENSSH PRIVATE KEY-----
+-----BEGIN RSA PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: AES-128-CBC,CB850C0867D33BF109BE25D73F2C6A57
+
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+-----END RSA PRIVATE KEY-----

sftp/ssh/key_with_passphrase.pub

@@ -1 +1 @@
-ssh-rsa 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 foo@bar.com
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAACAQCrbVT3iJTuSmPrMVti8/bZ0RYxEyyNPlefeAw9wtnqpOThtlS6132CWtRcQDXiVuuId5TINJWDuavjyQWj4yININv4wkTDH+0adg/kD8v+vNIG3ighbIeehyk2FFCFM1LSJsanJmTBzAgFtNMuQZhsfd3GWu0Ly+NSs3iatDf0eCgzNhppvO7eRGFR1qSnFC92sLryFKKXIHEKQ0Huw4E51ZA0b94pxtR2x947jThDevqJsyohldxWUl+2zTKOD+reDzV3Qi1b3Tn4W5ExON3kPWMayxJcLKdOF7hB7RD/Th/eFoEdyPKdY0sHMgCTmIH3Y3vc7HTW41cgXFVOR4ClNfd/o7qHnEJJcwXxVmdNhw/pjXQAWr+EKqB6IF5E/GObkkf8ZNB/c82jrpPKDhtbEYGD8rLcJHdZCbA2LFJMUeqfVElZNeQ762K2ggPpmQ6cPuD1fP5cRDSOtuEJX+jF1T6kUifrLVJiEE06QMNis32dF4xuABtZzqEGvYsbEHYp8VtsY4ADxhICgKxiNjVzFxW/8VaXKngNDAB1U4C9dHuDVEmQ10abWClbRBW+nNm+c3+eidbLGQLBqeRSLZ9WMDebx5/yP4NxIKKcHVee3ZoAVFX1awPWVusA/FjjY2lnhgz7Lgki3Z62oVuQjYFr9f4NOaPqiAZ6lbzVHFg6qw== foo@bar.com

sftp/ssh/key_without_passphrase

@@ -1,49 +1,51 @@
------BEGIN OPENSSH PRIVATE KEY-----
-b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAACFwAAAAdzc2gtcn
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------END OPENSSH PRIVATE KEY-----
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

sftp/ssh/key_without_passphrase.pub

@@ -1 +1 @@
-ssh-rsa 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 foo@bar.com
+ssh-rsa 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 foo@bar.com