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handle_http_settings_mfa.go
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/
handle_http_settings_mfa.go
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// Copyright 2022 Paul Greenberg greenpau@outlook.com
//
// 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 authn
import (
"context"
"encoding/base64"
"fmt"
"github.com/greenpau/go-authcrunch/pkg/authn/enums/operator"
"github.com/greenpau/go-authcrunch/pkg/identity"
"github.com/greenpau/go-authcrunch/pkg/identity/qr"
"github.com/greenpau/go-authcrunch/pkg/ids"
"github.com/greenpau/go-authcrunch/pkg/requests"
"github.com/greenpau/go-authcrunch/pkg/user"
"github.com/greenpau/go-authcrunch/pkg/util"
"github.com/skip2/go-qrcode"
"go.uber.org/zap"
"net/http"
"strings"
)
func (p *Portal) handleHTTPMfaBarcode(ctx context.Context, w http.ResponseWriter, r *http.Request, endpoint string) error {
qrCodeEncoded := strings.TrimPrefix(endpoint, "/mfa/barcode/")
qrCodeEncoded = strings.TrimSuffix(qrCodeEncoded, ".png")
codeURI, err := base64.StdEncoding.DecodeString(qrCodeEncoded)
if err != nil {
return p.handleHTTPRenderPlainText(ctx, w, http.StatusBadRequest)
}
png, err := qrcode.Encode(string(codeURI), qrcode.Medium, 256)
if err != nil {
return p.handleHTTPRenderPlainText(ctx, w, http.StatusInternalServerError)
}
w.Header().Set("Content-Type", "image/png")
w.Write(png)
return nil
}
func (p *Portal) handleHTTPMfaSettings(
ctx context.Context, r *http.Request, rr *requests.Request,
usr *user.User, store ids.IdentityStore, data map[string]interface{},
) error {
var action string
var status bool
entrypoint := "mfa"
data["view"] = entrypoint
endpoint, err := getEndpoint(r.URL.Path, "/"+entrypoint)
if err != nil {
return err
}
switch {
case strings.HasPrefix(endpoint, "/add/u2f") && r.Method == "POST":
// Add U2F token.
action = "add-u2f"
status = true
if err := validateAddU2FTokenForm(r, rr); err != nil {
attachFailStatus(data, fmt.Sprintf("Bad Request: %s", err))
break
}
if err = store.Request(operator.AddMfaToken, rr); err != nil {
attachFailStatus(data, fmt.Sprintf("%v", err))
break
}
attachSuccessStatus(data, "U2F token has been added")
case strings.HasPrefix(endpoint, "/add/u2f"):
// Add U2F token.
action = "add-u2f"
data["webauthn_challenge"] = util.GetRandomStringFromRange(64, 92)
data["webauthn_rp_name"] = "AUTHP"
data["webauthn_user_id"] = usr.Claims.ID
data["webauthn_user_email"] = usr.Claims.Email
data["webauthn_user_verification"] = "discouraged"
data["webauthn_attestation"] = "direct"
if usr.Claims.Name == "" {
data["webauthn_user_display_name"] = usr.Claims.Subject
} else {
data["webauthn_user_display_name"] = usr.Claims.Name
}
case strings.HasPrefix(endpoint, "/add/app") && r.Method == "POST":
// Add Application MFA token.
action = "add-app"
status = true
if err := validateAddMfaTokenForm(r, rr); err != nil {
attachFailStatus(data, fmt.Sprintf("Bad Request: %s", err))
break
}
if err = store.Request(operator.AddMfaToken, rr); err != nil {
attachFailStatus(data, fmt.Sprintf("%v", err))
break
}
attachSuccessStatus(data, "MFA token has been added")
case strings.HasPrefix(endpoint, "/add/app"):
action = "add-app"
qr := qr.NewCode()
qr.Secret = util.GetRandomStringFromRange(64, 92)
qr.Type = "totp"
qr.Label = fmt.Sprintf("AUTHP:%s", usr.Claims.Email)
qr.Period = 30
qr.Issuer = "AUTHP"
qr.Digits = 6
if err := qr.Build(); err != nil {
attachFailStatus(data, fmt.Sprintf("Failed creating QR code: %v", err))
break
}
data["mfa_label"] = qr.Issuer
data["mfa_comment"] = "My Authentication App"
data["mfa_email"] = usr.Claims.Email
data["mfa_type"] = qr.Type
data["mfa_secret"] = qr.Secret
data["mfa_period"] = fmt.Sprintf("%d", qr.Period)
data["mfa_digits"] = fmt.Sprintf("%d", qr.Digits)
data["code_uri"] = qr.Get()
data["code_uri_encoded"] = qr.GetEncoded()
case strings.HasPrefix(endpoint, "/test/app"):
// Test Application MFA token.
action = "test-app"
if r.Method == "POST" {
status = true
}
tokenID, digitCount, err := validateTestMfaTokenURL(endpoint)
data["mfa_token_id"] = tokenID
data["mfa_digits"] = digitCount
if err != nil {
attachFailStatus(data, fmt.Sprintf("Bad Request: %v", err))
break
}
if r.Method != "POST" {
break
}
// Validate the posted MFA token.
if err := validateMfaAuthTokenForm(r, rr); err != nil {
attachFailStatus(data, fmt.Sprintf("Bad Request: %v", err))
break
}
if err = store.Request(operator.GetMfaTokens, rr); err != nil {
attachFailStatus(data, fmt.Sprintf("%v", err))
break
}
var tokenValidated bool
bundle := rr.Response.Payload.(*identity.MfaTokenBundle)
for _, token := range bundle.Get() {
if token.ID != rr.MfaToken.ID {
continue
}
if err := token.ValidateCode(rr.MfaToken.Passcode); err != nil {
continue
}
tokenValidated = true
attachSuccessStatus(data, fmt.Sprintf("token id %s tested successfully", token.ID))
break
}
if tokenValidated {
break
}
attachFailStatus(data, "Invalid token passcode")
case strings.HasPrefix(endpoint, "/test/u2f"):
// Test U2F token.
var token *identity.MfaToken
action = "test-u2f"
tokenID, err := validateTestU2FTokenURL(endpoint)
data["mfa_token_id"] = tokenID
if err != nil {
status = true
attachFailStatus(data, fmt.Sprintf("Bad Request: %v", err))
break
}
// Get a list of U2F tokens.
if err = store.Request(operator.GetMfaTokens, rr); err != nil {
attachFailStatus(data, fmt.Sprintf("%v", err))
break
}
bundle := rr.Response.Payload.(*identity.MfaTokenBundle)
for _, t := range bundle.Get() {
if t.ID != tokenID {
continue
}
if t.Type != "u2f" {
continue
}
token = t
break
}
if token == nil {
status = true
attachFailStatus(data, fmt.Sprintf("Bad Request: U2F token id %s not found", tokenID))
break
}
if r.Method != "POST" {
// Authentication Ceremony parameters.
// Reference: https://www.w3.org/TR/webauthn-2/#sctn-assertion-privacy
if token.Parameters == nil {
status = true
attachFailStatus(data, fmt.Sprintf("Bad Request: U2F token id %s has no U2F parameters", tokenID))
break
}
validParams := true
for _, k := range []string{"id", "transports", "type"} {
if _, exists := token.Parameters["u2f_"+k]; !exists {
status = true
validParams = false
attachFailStatus(data, fmt.Sprintf("U2F token id %s has no %s U2F parameters", tokenID, k))
break
}
}
if !validParams {
break
}
var tokenTransports string
if len(token.Parameters["u2f_transports"]) > 0 {
tokenTransports = fmt.Sprintf(`"%s"`, strings.Join(strings.Split(token.Parameters["u2f_transports"], ","), `","`))
}
data["webauthn_challenge"] = util.GetRandomStringFromRange(64, 92)
data["webauthn_rp_name"] = "AUTHP"
data["webauthn_timeout"] = "60000"
// See https://chromium.googlesource.com/chromium/src/+/refs/heads/main/content/browser/webauth/uv_preferred.md
// data["webauthn_user_verification"] = "preferred"
data["webauthn_user_verification"] = "discouraged"
// data["webauthn_ext_uvm"] = "true"
data["webauthn_ext_uvm"] = "false"
data["webauthn_ext_loc"] = "false"
data["webauthn_tx_auth_simple"] = "Could you please verify yourself?"
var allowedCredentials []map[string]interface{}
allowedCredential := make(map[string]interface{})
allowedCredential["id"] = token.Parameters["u2f_id"]
allowedCredential["type"] = token.Parameters["u2f_type"]
allowedCredential["transports"] = tokenTransports
allowedCredentials = append(allowedCredentials, allowedCredential)
data["webauthn_credentials"] = allowedCredentials
break
}
// Validate the posted U2F token.
status = true
if err := validateAuthU2FTokenForm(r, rr); err != nil {
p.logger.Warn(
"detected malformed u2f token validation request",
zap.String("session_id", rr.Upstream.SessionID),
zap.String("request_id", rr.ID),
zap.Any("error", err),
)
attachFailStatus(data, fmt.Sprintf("Bad Request: %v", err))
break
}
if wr, err := token.WebAuthnRequest(rr.WebAuthn.Request); err != nil {
p.logger.Warn(
"u2f token validation failed",
zap.String("session_id", rr.Upstream.SessionID),
zap.String("request_id", rr.ID),
zap.Any("webauthn_request", wr),
zap.Any("error", err),
)
attachFailStatus(data, fmt.Sprintf("U2F authentication failed: %v", err))
break
} else {
p.logger.Debug(
"successfully validated u2f token",
zap.String("session_id", rr.Upstream.SessionID),
zap.String("request_id", rr.ID),
zap.Any("webauthn_request", wr),
)
}
attachSuccessStatus(data, fmt.Sprintf("U2F token id %s tested successfully", token.ID))
case strings.HasPrefix(endpoint, "/delete"):
// Delete a particular SSH key.
action = "delete"
status = true
tokenID, err := getEndpointKeyID(endpoint, "/delete/")
if err != nil {
attachFailStatus(data, fmt.Sprintf("%v", err))
break
}
rr.MfaToken.ID = tokenID
if err = store.Request(operator.DeleteMfaToken, rr); err != nil {
attachFailStatus(data, fmt.Sprintf("failed deleting token id %s: %v", tokenID, err))
break
}
attachSuccessStatus(data, fmt.Sprintf("token id %s deleted successfully", tokenID))
/*
case strings.HasPrefix(endpoint, "/view"):
// Get a particular SSH key.
action = "view"
keyID, err := getEndpointKeyID(endpoint, "/view/")
if err != nil {
attachFailStatus(data, fmt.Sprintf("%v", err))
break
}
rr.Key.Usage = "ssh"
if err = store.Request(operator.GetPublicKeys, rr); err != nil {
attachFailStatus(data, fmt.Sprintf("failed fetching key id %s: %v", keyID, err))
break
}
bundle := rr.Response.Payload.(*identity.PublicKeyBundle)
for _, k := range bundle.Get() {
if k.ID != keyID {
continue
}
var keyMap map[string]interface{}
keyBytes, _ := json.Marshal(k)
json.Unmarshal(keyBytes, &keyMap)
for _, w := range []string{"payload", "openssh"} {
if _, exists := keyMap[w]; !exists {
continue
}
delete(keyMap, w)
}
prettyKey, _ := json.MarshalIndent(keyMap, "", " ")
attachSuccessStatus(data, "OK")
data["key"] = string(prettyKey)
if k.Payload != "" {
data["pem_key"] = k.Payload
}
if k.OpenSSH != "" {
data["openssh_key"] = k.OpenSSH
}
break
}
*/
default:
// List MFA Tokens.
if err = store.Request(operator.GetMfaTokens, rr); err != nil {
attachFailStatus(data, fmt.Sprintf("%v", err))
break
}
bundle := rr.Response.Payload.(*identity.MfaTokenBundle)
tokens := bundle.Get()
if len(tokens) > 0 {
data["mfa_tokens"] = tokens
}
attachSuccessStatus(data, "OK")
}
attachView(data, entrypoint, action, status)
return nil
}