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authentik/outpost/pkg/ldap/instance_bind.go

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package ldap
import (
"context"
"errors"
"fmt"
"net"
"net/http"
"net/http/cookiejar"
"strings"
goldap "github.com/go-ldap/ldap/v3"
httptransport "github.com/go-openapi/runtime/client"
"github.com/nmcclain/ldap"
"goauthentik.io/outpost/pkg/client/core"
"goauthentik.io/outpost/pkg/client/flows"
)
type UIDResponse struct {
UIDFIeld string `json:"uid_field"`
}
type PasswordResponse struct {
Password string `json:"password"`
}
func (pi *ProviderInstance) getUsername(dn string) (string, error) {
if !strings.HasSuffix(dn, pi.BaseDN) {
return "", errors.New("invalid base DN")
}
dns, err := goldap.ParseDN(dn)
if err != nil {
return "", err
}
for _, part := range dns.RDNs {
for _, attribute := range part.Attributes {
if attribute.Type == "DN" {
return attribute.Value, nil
}
}
}
return "", errors.New("failed to find dn")
}
func (pi *ProviderInstance) Bind(username string, bindPW string, conn net.Conn) (ldap.LDAPResultCode, error) {
jar, err := cookiejar.New(nil)
if err != nil {
pi.log.WithError(err).Warning("Failed to create cookiejar")
return ldap.LDAPResultOperationsError, nil
}
client := &http.Client{
Jar: jar,
}
passed, err := pi.solveFlowChallenge(username, bindPW, client)
if err != nil {
pi.log.WithField("dn", username).WithError(err).Warning("failed to solve challenge")
return ldap.LDAPResultOperationsError, nil
}
if !passed {
return ldap.LDAPResultInvalidCredentials, nil
}
_, err = pi.s.ac.Client.Core.CoreApplicationsCheckAccess(&core.CoreApplicationsCheckAccessParams{
Slug: pi.appSlug,
Context: context.Background(),
HTTPClient: client,
}, httptransport.PassThroughAuth)
if err != nil {
if _, denied := err.(*core.CoreApplicationsCheckAccessForbidden); denied {
pi.log.WithField("dn", username).Info("Access denied for user")
return ldap.LDAPResultInsufficientAccessRights, nil
}
pi.log.WithField("dn", username).WithError(err).Warning("failed to check access")
return ldap.LDAPResultOperationsError, nil
}
pi.log.WithField("dn", username).Info("User has access")
return ldap.LDAPResultSuccess, nil
}
func (pi *ProviderInstance) solveFlowChallenge(bindDN string, password string, client *http.Client) (bool, error) {
challenge, err := pi.s.ac.Client.Flows.FlowsExecutorGet(&flows.FlowsExecutorGetParams{
FlowSlug: pi.flowSlug,
Query: "ldap=true",
Context: context.Background(),
HTTPClient: client,
}, httptransport.PassThroughAuth)
if err != nil {
pi.log.WithError(err).Warning("Failed to get challenge")
return false, err
}
pi.log.WithField("component", challenge.Payload.Component).WithField("type", *challenge.Payload.Type).Debug("Got challenge")
responseParams := &flows.FlowsExecutorSolveParams{
FlowSlug: pi.flowSlug,
Query: "ldap=true",
Context: context.Background(),
HTTPClient: client,
}
switch challenge.Payload.Component {
case "ak-stage-identification":
responseParams.Data = &UIDResponse{UIDFIeld: bindDN}
case "ak-stage-password":
responseParams.Data = &PasswordResponse{Password: password}
default:
return false, fmt.Errorf("unsupported challenge type: %s", challenge.Payload.Component)
}
response, err := pi.s.ac.Client.Flows.FlowsExecutorSolve(responseParams, httptransport.PassThroughAuth)
pi.log.WithField("component", response.Payload.Component).WithField("type", *response.Payload.Type).Debug("Got response")
if *response.Payload.Type == "redirect" {
return true, nil
}
if err != nil {
pi.log.WithError(err).Warning("Failed to submit challenge")
return false, err
}
if len(response.Payload.ResponseErrors) > 0 {
for key, errs := range response.Payload.ResponseErrors {
for _, err := range errs {
pi.log.WithField("key", key).WithField("code", *err.Code).Debug(*err.String)
return false, nil
}
}
}
return pi.solveFlowChallenge(bindDN, password, client)
}