check second factor after plugin authentication

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

README.md

@@ -22,7 +22,7 @@ I'd like to make SFTPGo into a sustainable long term project and would not like
 If you use SFTPGo, it is in your best interest to ensure that the project you rely on stays healthy and well maintained.
 This can only happen with your donations and [sponsorships](https://github.com/sponsors/drakkan) :heart:
 
-You can also purchase support plans from the [SFTPGo website](https://sftpgo.com/#pricing).
+You can also purchase, using many payment methods, support plans from the [SFTPGo website](https://sftpgo.com/#pricing).
 
 With sponsorships/donations or support plans we establish a channel for reciprocal access, ensuring better outcomes for both you and the project.
 

go.mod

@@ -25,7 +25,7 @@ require (
 	github.com/eikenb/pipeat v0.0.0-20210730190139-06b3e6902001
 	github.com/fclairamb/ftpserverlib v0.21.0
 	github.com/fclairamb/go-log v0.4.1
-	github.com/go-acme/lego/v4 v4.12.1
+	github.com/go-acme/lego/v4 v4.12.3
 	github.com/go-chi/chi/v5 v5.0.9-0.20230502103705-7f280968675b
 	github.com/go-chi/jwtauth/v5 v5.1.0
 	github.com/go-chi/render v1.0.2
@@ -36,7 +36,7 @@ require (
 	github.com/hashicorp/go-hclog v1.5.0
 	github.com/hashicorp/go-plugin v1.4.10
 	github.com/hashicorp/go-retryablehttp v0.7.4
-	github.com/jackc/pgx/v5 v5.4.0
+	github.com/jackc/pgx/v5 v5.4.1
 	github.com/jlaffaye/ftp v0.0.0-20201112195030-9aae4d151126
 	github.com/klauspost/compress v1.16.6
 	github.com/lestrrat-go/jwx/v2 v2.0.11
@@ -44,7 +44,7 @@ require (
 	github.com/mattn/go-sqlite3 v1.14.17
 	github.com/mhale/smtpd v0.8.0
 	github.com/minio/sio v0.3.1
-	github.com/otiai10/copy v1.11.0
+	github.com/otiai10/copy v1.12.0
 	github.com/pires/go-proxyproto v0.7.0
 	github.com/pkg/sftp v1.13.6-0.20230213180117-971c283182b6
 	github.com/pquerna/otp v1.4.0
@@ -59,7 +59,7 @@ require (
 	github.com/spf13/cobra v1.7.0
 	github.com/spf13/viper v1.16.0
 	github.com/stretchr/testify v1.8.4
-	github.com/studio-b12/gowebdav v0.0.0-20230203202212-3282f94193f2
+	github.com/studio-b12/gowebdav v0.9.0
 	github.com/subosito/gotenv v1.4.2
 	github.com/unrolled/secure v1.13.0
 	github.com/wagslane/go-password-validator v0.3.0
@@ -67,7 +67,7 @@ require (
 	github.com/yl2chen/cidranger v1.0.3-0.20210928021809-d1cb2c52f37a
 	go.etcd.io/bbolt v1.3.7
 	go.uber.org/automaxprocs v1.5.2
-	gocloud.dev v0.29.0
+	gocloud.dev v0.30.0
 	golang.org/x/crypto v0.10.0
 	golang.org/x/net v0.11.0
 	golang.org/x/oauth2 v0.9.0
@@ -79,10 +79,10 @@ require (
 )
 
 require (
-	cloud.google.com/go v0.110.2 // indirect
-	cloud.google.com/go/compute v1.20.0 // indirect
+	cloud.google.com/go v0.110.3 // indirect
+	cloud.google.com/go/compute v1.20.1 // indirect
 	cloud.google.com/go/compute/metadata v0.2.3 // indirect
-	cloud.google.com/go/iam v1.1.0 // indirect
+	cloud.google.com/go/iam v1.1.1 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.3.0 // indirect
 	github.com/ajg/form v1.5.1 // indirect
 	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.10 // indirect
@@ -135,7 +135,7 @@ require (
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.19 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
-	github.com/miekg/dns v1.1.54 // indirect
+	github.com/miekg/dns v1.1.55 // indirect
 	github.com/minio/sha256-simd v1.0.1 // indirect
 	github.com/mitchellh/go-testing-interface v1.14.1 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
@@ -164,7 +164,7 @@ require (
 	google.golang.org/genproto v0.0.0-20230530153820-e85fd2cbaebc // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20230530153820-e85fd2cbaebc // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20230530153820-e85fd2cbaebc // indirect
-	google.golang.org/grpc v1.56.0 // indirect
+	google.golang.org/grpc v1.56.1 // indirect
 	google.golang.org/protobuf v1.30.0 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect

internal/dataprovider/dataprovider.go

@@ -3490,7 +3490,7 @@ func doBuiltinKeyboardInteractiveAuth(user *User, client ssh.KeyboardInteractive
 		return 0, err
 	}
 	if len(answers) != 1 {
-		return 0, fmt.Errorf("unexpected number of answers: %v", len(answers))
+		return 0, fmt.Errorf("unexpected number of answers: %d", len(answers))
 	}
 	err = user.LoadAndApplyGroupSettings()
 	if err != nil {
@@ -3500,16 +3500,20 @@ func doBuiltinKeyboardInteractiveAuth(user *User, client ssh.KeyboardInteractive
 	if err != nil {
 		return 0, err
 	}
+	return checkKeyboardInteractiveSecondFactor(user, client, protocol)
+}
+
+func checkKeyboardInteractiveSecondFactor(user *User, client ssh.KeyboardInteractiveChallenge, protocol string) (int, error) {
 	if !user.Filters.TOTPConfig.Enabled || !util.Contains(user.Filters.TOTPConfig.Protocols, protocolSSH) {
 		return 1, nil
 	}
-	err = user.Filters.TOTPConfig.Secret.TryDecrypt()
+	err := user.Filters.TOTPConfig.Secret.TryDecrypt()
 	if err != nil {
 		providerLog(logger.LevelError, "unable to decrypt TOTP secret for user %q, protocol %v, err: %v",
 			user.Username, protocol, err)
 		return 0, err
 	}
-	answers, err = client("", "", []string{"Authentication code: "}, []bool{false})
+	answers, err := client("", "", []string{"Authentication code: "}, []bool{false})
 	if err != nil {
 		return 0, err
 	}
@@ -3742,6 +3746,9 @@ func doKeyboardInteractiveAuth(user *User, authHook string, client ssh.KeyboardI
 	var err error
 	if plugin.Handler.HasAuthScope(plugin.AuthScopeKeyboardInteractive) {
 		authResult, err = executeKeyboardInteractivePlugin(user, client, ip, protocol)
+		if authResult == 1 && err == nil {
+			authResult, err = checkKeyboardInteractiveSecondFactor(user, client, protocol)
+		}
 	} else if authHook != "" {
 		if strings.HasPrefix(authHook, "http") {
 			authResult, err = executeKeyboardInteractiveHTTPHook(user, authHook, client, ip, protocol)