feat(authentication): unauthenticated ldap bind (#3291)

This allows configuring unauthenticated LDAP binding.

config.template.yml

@@ -790,8 +790,7 @@ notifier:
     ## Enables additional debug messages.
     # enable_client_debug_messages: false
 
-    ## SECURITY NOTICE: It's not recommended changing this option, and highly discouraged to have it below 8 for
+    ## SECURITY NOTICE: It's not recommended changing this option and values below 8 are strongly discouraged.
-    ## security reasons.
     # minimum_parameter_entropy: 8
 
     ## SECURITY NOTICE: It's not recommended changing this option, and highly discouraged to have it set to 'never'

docs/content/en/configuration/first-factor/ldap.md

@@ -38,6 +38,7 @@ authentication_backend:
     groups_filter: (&(member={dn})(objectClass=groupOfNames))
     group_name_attribute: cn
     permit_referrals: false
+    permit_unauthenticated_bind: false
     user: CN=admin,DC=example,DC=com
     password: password
 ```
@@ -50,7 +51,7 @@ authentication_backend:
 
 Configures the LDAP implementation used by Authelia.
 
-See the [Implementation Guide](#implementation-guide) for information.
+See the [Implementation Guide](../../reference/guides/ldap.md#implementation-guide) for information.
 
 ### url
 
@@ -170,7 +171,7 @@ using the following filter which is currently only tested against Microsoft Acti
 
 `(&(member:1.2.840.113556.1.4.1941:={dn})(objectClass=group)(objectCategory=group))`
 
-## group_name_attribute
+### group_name_attribute
 
 {{< confkey type="string" required="situational" >}}
 
@@ -180,13 +181,24 @@ information.*
 
 The LDAP attribute that is used by Authelia to determine the group name.
 
-## permit_referrals
+### permit_referrals
 
 {{< confkey type="boolean" default="false" required="no" >}}
 
 Permits following referrals. This is useful if you have read-only servers in your architecture and thus require
 referrals to be followed when performing write operations.
 
+### permit_unauthenticated_bind
+
+{{< confkey type="boolean" default="false" required="no" >}}
+
+*__WARNING:__ This option is strongly discouraged. Please consider disabling unauthenticated binding to your LDAP
+server and utilizing a service account.*
+
+Permits binding to the server without a password. For this option to be enabled both the [password](#password)
+configuration option must be blank and [disable_reset_password](introduction.md#disable_reset_password) must be
+disabled.
+
 ### user
 
 {{< confkey type="string" required="yes" >}}
@@ -200,65 +212,6 @@ The distinguished name of the user paired with the password to bind with for loo
 The password of the user paired with the user to bind with for lookup and password change operations.
 Can also be defined using a [secret](../methods/secrets.md) which is the recommended for containerized deployments.
 
-## Implementation Guide
-
-There are currently two implementations, `custom` and `activedirectory`. The `activedirectory` implementation
-must be used if you wish to allow users to change or reset their password as Active Directory
-uses a custom attribute for this, and an input format other implementations do not use. The long term
-intention of this is to have logical defaults for various RFC implementations of LDAP.
-
-### Filter replacements
-
-Various replacements occur in the user and groups filter. The replacements either occur at startup or upon an LDAP
-search.
-
-#### Users filter replacements
-
-|       Placeholder        |  Phase  |              Replacement              |
-|:------------------------:|:-------:|:-------------------------------------:|
-|   {username_attribute}   | startup |   The configured username attribute   |
-|     {mail_attribute}     | startup |     The configured mail attribute     |
-| {display_name_attribute} | startup | The configured display name attribute |
-|         {input}          | search  |   The input into the username field   |
-
-#### Groups filter replacements
-
-| Placeholder | Phase  |                                Replacement                                |
-|:-----------:|:------:|:-------------------------------------------------------------------------:|
-|   {input}   | search |                     The input into the username field                     |
-| {username}  | search | The username from the profile lookup obtained from the username attribute |
-|    {dn}     | search |              The distinguished name from the profile lookup               |
-
-### Defaults
-
-The below tables describes the current attribute defaults for each implementation.
-
-#### Attribute defaults
-
-This table describes the attribute defaults for each implementation. i.e. the username_attribute is described by the
-Username column.
-
-| Implementation  |    Username    | Display Name | Mail | Group Name |
-|:---------------:|:--------------:|:------------:|:----:|:----------:|
-|     custom      |      N/A       | displayName  | mail |     cn     |
-| activedirectory | sAMAccountName | displayName  | mail |     cn     |
-
-#### Filter defaults
-
-The filters are probably the most important part to get correct when setting up LDAP. You want to exclude disabled
-accounts. The active directory example has two attribute filters that accomplish this as an example (more examples would
-be appreciated). The userAccountControl filter checks that the account is not disabled and the pwdLastSet makes sure that
-value is not 0 which means the password requires changing at the next login.
-
-| Implementation  |                                                                          Users Filter                                                                           |                       Groups Filter                       |
-|:---------------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------:|:---------------------------------------------------------:|
-|     custom      |                                                                               N/A                                                                               |                            N/A                            |
-| activedirectory | (&(&#124;({username_attribute}={input})({mail_attribute}={input}))(sAMAccountType=805306368)(!(userAccountControl:1.2.840.113556.1.4.803:=2))(!(pwdLastSet=0))) | (&(member={dn})(objectClass=group)(objectCategory=group)) |
-
-*__Note:__* The Active Directory filter `(sAMAccountType=805306368)` is exactly the same as
-`(&(objectCategory=person)(objectClass=user))` except that the former is more performant, you can read more about this
-and other Active Directory filters on the [TechNet wiki](https://social.technet.microsoft.com/wiki/contents/articles/5392.active-directory-ldap-syntax-filters.aspx).
-
 ## Refresh Interval
 
 It's recommended you either use the default [refresh interval](./introduction.md#refresh_interval) or configure this to
@@ -274,6 +227,10 @@ In order to avoid such problems, we highly recommended you follow [RFC2307] by u
 Directory and `uid` for other implementations as the attribute holding the unique identifier
 for your users.
 
+## See Also
+
+- [LDAP Reference Guide](../../reference/guides/ldap.md)
+
 [username attribute]: #username_attribute
 [TechNet wiki]: https://social.technet.microsoft.com/wiki/contents/articles/5392.active-directory-ldap-syntax-filters.aspx
 [RFC2307]: https://www.rfc-editor.org/rfc/rfc2307.html

docs/content/en/reference/guides/ldap.md

@@ -0,0 +1,104 @@
+---
+title: "LDAP"
+description: "A reference guide on the LDAP implementation specifics"
+lead: "This section contains reference documentation for Authelia's LDAP implementation specifics."
+date: 2022-03-20T12:52:27+11:00
+draft: false
+images: []
+menu:
+  reference:
+    parent: "guides"
+weight: 220
+toc: true
+---
+
+## Binding
+
+When it comes to LDAP there are several considerations for deciding how to bind to the LDAP server.
+
+### Unauthenticated Binding
+
+The most insecure method is unauthenticated binds. They are generally considered insecure due to the fact allowing them
+at all ensures anyone with any level of network access can easily obtain objects and their attributes.
+
+Authelia does support unauthenticated binds but it is not by default, you must configure the
+[permit_unauthenticated_bind](../../configuration/first-factor/ldap.md#permit_unauthenticated_bind) configuration
+option.
+
+### End-User Binding
+
+One method to bind to the server that is favored by a lot of people is binding to the LDAP server as the end user. While
+this is more secure than methods such as [Unauthenticated Binding](#unauthenticated-binding) the drawback is that it can
+only be used securely at the time the user enters their credentials. Storing a password in memory in general is not very
+secure and prone to breakage due to outside influences (i.e. the user changes their password).
+
+In addition, this method is not compatible with the password reset / forgot password flow at all (not to be confused
+with a change password flow).
+
+Authelia doesn't currently support such a binding method excluding for checking user passwords.
+
+### Service-User Binding
+
+This is the most common method of binding to LDAP. This involves setting up a special service user with a complex
+password which has the minimum permissions required to do the tasks required.
+
+Authelia primarily supports this method.
+
+## Implementation Guide
+
+There are currently two implementations, `custom` and `activedirectory`. The `activedirectory` implementation
+must be used if you wish to allow users to change or reset their password as Active Directory
+uses a custom attribute for this, and an input format other implementations do not use. The long term
+intention of this is to have logical defaults for various RFC implementations of LDAP.
+
+### Filter replacements
+
+Various replacements occur in the user and groups filter. The replacements either occur at startup or upon an LDAP
+search.
+
+#### Users filter replacements
+
+|       Placeholder        |  Phase  |              Replacement              |
+|:------------------------:|:-------:|:-------------------------------------:|
+|   {username_attribute}   | startup |   The configured username attribute   |
+|     {mail_attribute}     | startup |     The configured mail attribute     |
+| {display_name_attribute} | startup | The configured display name attribute |
+|         {input}          | search  |   The input into the username field   |
+
+#### Groups filter replacements
+
+| Placeholder | Phase  |                                Replacement                                |
+|:-----------:|:------:|:-------------------------------------------------------------------------:|
+|   {input}   | search |                     The input into the username field                     |
+| {username}  | search | The username from the profile lookup obtained from the username attribute |
+|    {dn}     | search |              The distinguished name from the profile lookup               |
+
+### Defaults
+
+The below tables describes the current attribute defaults for each implementation.
+
+#### Attribute defaults
+
+This table describes the attribute defaults for each implementation. i.e. the username_attribute is described by the
+Username column.
+
+| Implementation  |    Username    | Display Name | Mail | Group Name |
+|:---------------:|:--------------:|:------------:|:----:|:----------:|
+|     custom      |      N/A       | displayName  | mail |     cn     |
+| activedirectory | sAMAccountName | displayName  | mail |     cn     |
+
+#### Filter defaults
+
+The filters are probably the most important part to get correct when setting up LDAP. You want to exclude disabled
+accounts. The active directory example has two attribute filters that accomplish this as an example (more examples would
+be appreciated). The userAccountControl filter checks that the account is not disabled and the pwdLastSet makes sure that
+value is not 0 which means the password requires changing at the next login.
+
+| Implementation  |                                                                          Users Filter                                                                           |                       Groups Filter                       |
+|:---------------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------:|:---------------------------------------------------------:|
+|     custom      |                                                                               N/A                                                                               |                            N/A                            |
+| activedirectory | (&(|({username_attribute}={input})({mail_attribute}={input}))(sAMAccountType=805306368)(!(userAccountControl:1.2.840.113556.1.4.803:=2))(!(pwdLastSet=0))) | (&(member={dn})(objectClass=group)(objectCategory=group)) |
+
+*__Note:__* The Active Directory filter `(sAMAccountType=805306368)` is exactly the same as
+`(&(objectCategory=person)(objectClass=user))` except that the former is more performant, you can read more about this
+and other Active Directory filters on the [TechNet wiki](https://social.technet.microsoft.com/wiki/contents/articles/5392.active-directory-ldap-syntax-filters.aspx).

internal/authentication/ldap_client_mock.go

@@ -118,3 +118,17 @@ func (mr *MockLDAPClientMockRecorder) StartTLS(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "StartTLS", reflect.TypeOf((*MockLDAPClient)(nil).StartTLS), arg0)
 }
+
+// UnauthenticatedBind mocks base method.
+func (m *MockLDAPClient) UnauthenticatedBind(arg0 string) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "UnauthenticatedBind", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// UnauthenticatedBind indicates an expected call of UnauthenticatedBind.
+func (mr *MockLDAPClientMockRecorder) UnauthenticatedBind(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "UnauthenticatedBind", reflect.TypeOf((*MockLDAPClient)(nil).UnauthenticatedBind), arg0)
+}

internal/authentication/ldap_user_provider.go

@@ -226,7 +226,7 @@ func (p *LDAPUserProvider) connect() (client LDAPClient, err error) {
 	return p.connectCustom(p.config.URL, p.config.User, p.config.Password, p.config.StartTLS, p.dialOpts...)
 }
 
-func (p *LDAPUserProvider) connectCustom(url, userDN, password string, startTLS bool, opts ...ldap.DialOpt) (client LDAPClient, err error) {
+func (p *LDAPUserProvider) connectCustom(url, username, password string, startTLS bool, opts ...ldap.DialOpt) (client LDAPClient, err error) {
 	if client, err = p.factory.DialURL(url, opts...); err != nil {
 		return nil, fmt.Errorf("dial failed with error: %w", err)
 	}
@@ -239,7 +239,13 @@ func (p *LDAPUserProvider) connectCustom(url, userDN, password string, startTLS
 		}
 	}
 
-	if err = client.Bind(userDN, password); err != nil {
+	if password == "" {
+		err = client.UnauthenticatedBind(username)
+	} else {
+		err = client.Bind(username, password)
+	}
+
+	if err != nil {
 		client.Close()
 
 		return nil, fmt.Errorf("bind failed with error: %w", err)

internal/authentication/types.go

@@ -20,6 +20,7 @@ type LDAPClient interface {
 	StartTLS(config *tls.Config) (err error)
 
 	Bind(username, password string) (err error)
+	UnauthenticatedBind(username string) (err error)
 
 	Modify(modifyRequest *ldap.ModifyRequest) (err error)
 	PasswordModify(pwdModifyRequest *ldap.PasswordModifyRequest) (pwdModifyResult *ldap.PasswordModifyResult, err error)

internal/configuration/config.template.yml

@@ -790,8 +790,7 @@ notifier:
     ## Enables additional debug messages.
     # enable_client_debug_messages: false
 
-    ## SECURITY NOTICE: It's not recommended changing this option, and highly discouraged to have it below 8 for
+    ## SECURITY NOTICE: It's not recommended changing this option and values below 8 are strongly discouraged.
-    ## security reasons.
     # minimum_parameter_entropy: 8
 
     ## SECURITY NOTICE: It's not recommended changing this option, and highly discouraged to have it set to 'never'

internal/configuration/schema/authentication.go

@@ -27,6 +27,7 @@ type LDAPAuthenticationBackendConfiguration struct {
 	DisplayNameAttribute string `koanf:"display_name_attribute"`
 
 	PermitReferrals           bool `koanf:"permit_referrals"`
+	PermitUnauthenticatedBind bool `koanf:"permit_unauthenticated_bind"`
 
 	User     string `koanf:"user"`
 	Password string `koanf:"password"`

internal/configuration/schema/keys.go

@@ -62,6 +62,7 @@ var Keys = []string{
 	"authentication_backend.ldap.mail_attribute",
 	"authentication_backend.ldap.display_name_attribute",
 	"authentication_backend.ldap.permit_referrals",
+	"authentication_backend.ldap.permit_unauthenticated_bind",
 	"authentication_backend.ldap.user",
 	"authentication_backend.ldap.password",
 	"authentication_backend.file.path",

internal/configuration/validator/authentication.go

@@ -22,7 +22,7 @@ func ValidateAuthenticationBackend(config *schema.AuthenticationBackendConfigura
 	if config.File != nil {
 		validateFileAuthenticationBackend(config.File, validator)
 	} else if config.LDAP != nil {
-		validateLDAPAuthenticationBackend(config.LDAP, validator)
+		validateLDAPAuthenticationBackend(config, validator)
 	}
 
 	if config.RefreshInterval == "" {
@@ -118,50 +118,50 @@ func validateFileAuthenticationBackendArgon2id(config *schema.PasswordConfigurat
 	}
 }
 
-func validateLDAPAuthenticationBackend(config *schema.LDAPAuthenticationBackendConfiguration, validator *schema.StructValidator) {
+func validateLDAPAuthenticationBackend(config *schema.AuthenticationBackendConfiguration, validator *schema.StructValidator) {
-	if config.Timeout == 0 {
+	if config.LDAP.Timeout == 0 {
-		config.Timeout = schema.DefaultLDAPAuthenticationBackendConfiguration.Timeout
+		config.LDAP.Timeout = schema.DefaultLDAPAuthenticationBackendConfiguration.Timeout
 	}
 
-	if config.Implementation == "" {
+	if config.LDAP.Implementation == "" {
-		config.Implementation = schema.DefaultLDAPAuthenticationBackendConfiguration.Implementation
+		config.LDAP.Implementation = schema.DefaultLDAPAuthenticationBackendConfiguration.Implementation
 	}
 
-	if config.TLS == nil {
+	if config.LDAP.TLS == nil {
-		config.TLS = schema.DefaultLDAPAuthenticationBackendConfiguration.TLS
+		config.LDAP.TLS = schema.DefaultLDAPAuthenticationBackendConfiguration.TLS
-	} else if config.TLS.MinimumVersion == "" {
+	} else if config.LDAP.TLS.MinimumVersion == "" {
-		config.TLS.MinimumVersion = schema.DefaultLDAPAuthenticationBackendConfiguration.TLS.MinimumVersion
+		config.LDAP.TLS.MinimumVersion = schema.DefaultLDAPAuthenticationBackendConfiguration.TLS.MinimumVersion
 	}
 
-	if _, err := utils.TLSStringToTLSConfigVersion(config.TLS.MinimumVersion); err != nil {
+	if _, err := utils.TLSStringToTLSConfigVersion(config.LDAP.TLS.MinimumVersion); err != nil {
-		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendTLSMinVersion, config.TLS.MinimumVersion, err))
+		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendTLSMinVersion, config.LDAP.TLS.MinimumVersion, err))
 	}
 
-	switch config.Implementation {
+	switch config.LDAP.Implementation {
 	case schema.LDAPImplementationCustom:
-		setDefaultImplementationCustomLDAPAuthenticationBackend(config)
+		setDefaultImplementationCustomLDAPAuthenticationBackend(config.LDAP)
 	case schema.LDAPImplementationActiveDirectory:
-		setDefaultImplementationActiveDirectoryLDAPAuthenticationBackend(config)
+		setDefaultImplementationActiveDirectoryLDAPAuthenticationBackend(config.LDAP)
 	default:
-		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendImplementation, config.Implementation, strings.Join([]string{schema.LDAPImplementationCustom, schema.LDAPImplementationActiveDirectory}, "', '")))
+		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendImplementation, config.LDAP.Implementation, strings.Join([]string{schema.LDAPImplementationCustom, schema.LDAPImplementationActiveDirectory}, "', '")))
 	}
 
-	if strings.Contains(config.UsersFilter, "{0}") {
+	if strings.Contains(config.LDAP.UsersFilter, "{0}") {
 		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendFilterReplacedPlaceholders, "users_filter", "{0}", "{input}"))
 	}
 
-	if strings.Contains(config.GroupsFilter, "{0}") {
+	if strings.Contains(config.LDAP.GroupsFilter, "{0}") {
 		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendFilterReplacedPlaceholders, "groups_filter", "{0}", "{input}"))
 	}
 
-	if strings.Contains(config.GroupsFilter, "{1}") {
+	if strings.Contains(config.LDAP.GroupsFilter, "{1}") {
 		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendFilterReplacedPlaceholders, "groups_filter", "{1}", "{username}"))
 	}
 
-	if config.URL == "" {
+	if config.LDAP.URL == "" {
 		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendMissingOption, "url"))
 	} else {
-		validateLDAPAuthenticationBackendURL(config, validator)
+		validateLDAPAuthenticationBackendURL(config.LDAP, validator)
 	}
 
 	validateLDAPRequiredParameters(config, validator)
@@ -191,42 +191,50 @@ func validateLDAPAuthenticationBackendURL(config *schema.LDAPAuthenticationBacke
 	}
 }
 
-func validateLDAPRequiredParameters(config *schema.LDAPAuthenticationBackendConfiguration, validator *schema.StructValidator) {
+func validateLDAPRequiredParameters(config *schema.AuthenticationBackendConfiguration, validator *schema.StructValidator) {
-	// TODO: see if it's possible to disable this check if disable_reset_password is set and when anonymous/user binding is supported (#101 and #387).
+	if config.LDAP.PermitUnauthenticatedBind {
-	if config.User == "" {
+		if config.LDAP.Password != "" {
+			validator.Push(fmt.Errorf(errFmtLDAPAuthBackendUnauthenticatedBindWithPassword))
+		}
+
+		if !config.DisableResetPassword {
+			validator.Push(fmt.Errorf(errFmtLDAPAuthBackendUnauthenticatedBindWithResetEnabled))
+		}
+	} else {
+		if config.LDAP.User == "" {
 			validator.Push(fmt.Errorf(errFmtLDAPAuthBackendMissingOption, "user"))
 		}
 
-	// TODO: see if it's possible to disable this check if disable_reset_password is set and when anonymous/user binding is supported (#101 and #387).
+		if config.LDAP.Password == "" {
-	if config.Password == "" {
 			validator.Push(fmt.Errorf(errFmtLDAPAuthBackendMissingOption, "password"))
 		}
+	}
 
-	if config.BaseDN == "" {
+	if config.LDAP.BaseDN == "" {
 		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendMissingOption, "base_dn"))
 	}
 
-	if config.UsersFilter == "" {
+	if config.LDAP.UsersFilter == "" {
 		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendMissingOption, "users_filter"))
 	} else {
-		if !strings.HasPrefix(config.UsersFilter, "(") || !strings.HasSuffix(config.UsersFilter, ")") {
+		if !strings.HasPrefix(config.LDAP.UsersFilter, "(") || !strings.HasSuffix(config.LDAP.UsersFilter, ")") {
-			validator.Push(fmt.Errorf(errFmtLDAPAuthBackendFilterEnclosingParenthesis, "users_filter", config.UsersFilter, config.UsersFilter))
+			validator.Push(fmt.Errorf(errFmtLDAPAuthBackendFilterEnclosingParenthesis, "users_filter", config.LDAP.UsersFilter, config.LDAP.UsersFilter))
 		}
 
-		if !strings.Contains(config.UsersFilter, "{username_attribute}") {
+		if !strings.Contains(config.LDAP.UsersFilter, "{username_attribute}") {
 			validator.Push(fmt.Errorf(errFmtLDAPAuthBackendFilterMissingPlaceholder, "users_filter", "username_attribute"))
 		}
 
 		// This test helps the user know that users_filter is broken after the breaking change induced by this commit.
-		if !strings.Contains(config.UsersFilter, "{input}") {
+		if !strings.Contains(config.LDAP.UsersFilter, "{input}") {
 			validator.Push(fmt.Errorf(errFmtLDAPAuthBackendFilterMissingPlaceholder, "users_filter", "input"))
 		}
 	}
 
-	if config.GroupsFilter == "" {
+	if config.LDAP.GroupsFilter == "" {
 		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendMissingOption, "groups_filter"))
-	} else if !strings.HasPrefix(config.GroupsFilter, "(") || !strings.HasSuffix(config.GroupsFilter, ")") {
+	} else if !strings.HasPrefix(config.LDAP.GroupsFilter, "(") || !strings.HasSuffix(config.LDAP.GroupsFilter, ")") {
-		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendFilterEnclosingParenthesis, "groups_filter", config.GroupsFilter, config.GroupsFilter))
+		validator.Push(fmt.Errorf(errFmtLDAPAuthBackendFilterEnclosingParenthesis, "groups_filter", config.LDAP.GroupsFilter, config.LDAP.GroupsFilter))
 	}
 }
 

internal/configuration/validator/const.go

@@ -85,6 +85,9 @@ const (
 		"must at least be parallelism multiplied by 8 when using algorithm 'argon2id' " +
 		"with parallelism %d it should be at least %d but it is configured as '%d'"
 
+	errFmtLDAPAuthBackendUnauthenticatedBindWithPassword     = "authentication_backend: ldap: option 'permit_unauthenticated_bind' can't be enabled when a password is specified"
+	errFmtLDAPAuthBackendUnauthenticatedBindWithResetEnabled = "authentication_backend: ldap: option 'permit_unauthenticated_bind' can't be enabled when password reset is enabled"
+
 	errFmtLDAPAuthBackendMissingOption = "authentication_backend: ldap: option '%s' is required"
 	errFmtLDAPAuthBackendTLSMinVersion = "authentication_backend: ldap: tls: option " +
 		"'minimum_tls_version' is invalid: %s: %w"