ClickHouse/tests/testflows/ldap/requirements/requirements.md

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# SRS-007 ClickHouse Authentication of Users via LDAP
## Table of Contents
* 1 [Revision History](#revision-history)
* 2 [Introduction](#introduction)
* 3 [Terminology](#terminology)
* 4 [Requirements](#requirements)
* 4.1 [Generic](#generic)
* 4.1.1 [RQ.SRS-007.LDAP.Authentication](#rqsrs-007ldapauthentication)
* 4.1.2 [RQ.SRS-007.LDAP.Authentication.MultipleServers](#rqsrs-007ldapauthenticationmultipleservers)
* 4.1.3 [RQ.SRS-007.LDAP.Authentication.Protocol.PlainText](#rqsrs-007ldapauthenticationprotocolplaintext)
* 4.1.4 [RQ.SRS-007.LDAP.Authentication.Protocol.TLS](#rqsrs-007ldapauthenticationprotocoltls)
* 4.1.5 [RQ.SRS-007.LDAP.Authentication.Protocol.StartTLS](#rqsrs-007ldapauthenticationprotocolstarttls)
* 4.1.6 [RQ.SRS-007.LDAP.Authentication.TLS.Certificate.Validation](#rqsrs-007ldapauthenticationtlscertificatevalidation)
* 4.1.7 [RQ.SRS-007.LDAP.Authentication.TLS.Certificate.SelfSigned](#rqsrs-007ldapauthenticationtlscertificateselfsigned)
* 4.1.8 [RQ.SRS-007.LDAP.Authentication.TLS.Certificate.SpecificCertificationAuthority](#rqsrs-007ldapauthenticationtlscertificatespecificcertificationauthority)
* 4.1.9 [RQ.SRS-007.LDAP.Server.Configuration.Invalid](#rqsrs-007ldapserverconfigurationinvalid)
* 4.1.10 [RQ.SRS-007.LDAP.User.Configuration.Invalid](#rqsrs-007ldapuserconfigurationinvalid)
* 4.1.11 [RQ.SRS-007.LDAP.Authentication.Mechanism.Anonymous](#rqsrs-007ldapauthenticationmechanismanonymous)
* 4.1.12 [RQ.SRS-007.LDAP.Authentication.Mechanism.Unauthenticated](#rqsrs-007ldapauthenticationmechanismunauthenticated)
* 4.1.13 [RQ.SRS-007.LDAP.Authentication.Mechanism.NamePassword](#rqsrs-007ldapauthenticationmechanismnamepassword)
* 4.1.14 [RQ.SRS-007.LDAP.Authentication.Valid](#rqsrs-007ldapauthenticationvalid)
* 4.1.15 [RQ.SRS-007.LDAP.Authentication.Invalid](#rqsrs-007ldapauthenticationinvalid)
* 4.1.16 [RQ.SRS-007.LDAP.Authentication.Invalid.DeletedUser](#rqsrs-007ldapauthenticationinvaliddeleteduser)
* 4.1.17 [RQ.SRS-007.LDAP.Authentication.UsernameChanged](#rqsrs-007ldapauthenticationusernamechanged)
* 4.1.18 [RQ.SRS-007.LDAP.Authentication.PasswordChanged](#rqsrs-007ldapauthenticationpasswordchanged)
* 4.1.19 [RQ.SRS-007.LDAP.Authentication.LDAPServerRestart](#rqsrs-007ldapauthenticationldapserverrestart)
* 4.1.20 [RQ.SRS-007.LDAP.Authentication.ClickHouseServerRestart](#rqsrs-007ldapauthenticationclickhouseserverrestart)
* 4.1.21 [RQ.SRS-007.LDAP.Authentication.Parallel](#rqsrs-007ldapauthenticationparallel)
* 4.1.22 [RQ.SRS-007.LDAP.Authentication.Parallel.ValidAndInvalid](#rqsrs-007ldapauthenticationparallelvalidandinvalid)
* 4.2 [Specific](#specific)
* 4.2.1 [RQ.SRS-007.LDAP.UnreachableServer](#rqsrs-007ldapunreachableserver)
* 4.2.2 [RQ.SRS-007.LDAP.Configuration.Server.Name](#rqsrs-007ldapconfigurationservername)
* 4.2.3 [RQ.SRS-007.LDAP.Configuration.Server.Host](#rqsrs-007ldapconfigurationserverhost)
* 4.2.4 [RQ.SRS-007.LDAP.Configuration.Server.Port](#rqsrs-007ldapconfigurationserverport)
* 4.2.5 [RQ.SRS-007.LDAP.Configuration.Server.Port.Default](#rqsrs-007ldapconfigurationserverportdefault)
* 4.2.6 [RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Prefix](#rqsrs-007ldapconfigurationserverauthdnprefix)
* 4.2.7 [RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Suffix](#rqsrs-007ldapconfigurationserverauthdnsuffix)
* 4.2.8 [RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Value](#rqsrs-007ldapconfigurationserverauthdnvalue)
* 4.2.9 [RQ.SRS-007.LDAP.Configuration.Server.EnableTLS](#rqsrs-007ldapconfigurationserverenabletls)
* 4.2.10 [RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.Default](#rqsrs-007ldapconfigurationserverenabletlsoptionsdefault)
* 4.2.11 [RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.No](#rqsrs-007ldapconfigurationserverenabletlsoptionsno)
* 4.2.12 [RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.Yes](#rqsrs-007ldapconfigurationserverenabletlsoptionsyes)
* 4.2.13 [RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.StartTLS](#rqsrs-007ldapconfigurationserverenabletlsoptionsstarttls)
* 4.2.14 [RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion](#rqsrs-007ldapconfigurationservertlsminimumprotocolversion)
* 4.2.15 [RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion.Values](#rqsrs-007ldapconfigurationservertlsminimumprotocolversionvalues)
* 4.2.16 [RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion.Default](#rqsrs-007ldapconfigurationservertlsminimumprotocolversiondefault)
* 4.2.17 [RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert](#rqsrs-007ldapconfigurationservertlsrequirecert)
* 4.2.18 [RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Default](#rqsrs-007ldapconfigurationservertlsrequirecertoptionsdefault)
* 4.2.19 [RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Demand](#rqsrs-007ldapconfigurationservertlsrequirecertoptionsdemand)
* 4.2.20 [RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Allow](#rqsrs-007ldapconfigurationservertlsrequirecertoptionsallow)
* 4.2.21 [RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Try](#rqsrs-007ldapconfigurationservertlsrequirecertoptionstry)
* 4.2.22 [RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Never](#rqsrs-007ldapconfigurationservertlsrequirecertoptionsnever)
* 4.2.23 [RQ.SRS-007.LDAP.Configuration.Server.TLSCertFile](#rqsrs-007ldapconfigurationservertlscertfile)
* 4.2.24 [RQ.SRS-007.LDAP.Configuration.Server.TLSKeyFile](#rqsrs-007ldapconfigurationservertlskeyfile)
* 4.2.25 [RQ.SRS-007.LDAP.Configuration.Server.TLSCACertDir](#rqsrs-007ldapconfigurationservertlscacertdir)
* 4.2.26 [RQ.SRS-007.LDAP.Configuration.Server.TLSCACertFile](#rqsrs-007ldapconfigurationservertlscacertfile)
* 4.2.27 [RQ.SRS-007.LDAP.Configuration.Server.TLSCipherSuite](#rqsrs-007ldapconfigurationservertlsciphersuite)
* 4.2.28 [RQ.SRS-007.LDAP.Configuration.Server.Syntax](#rqsrs-007ldapconfigurationserversyntax)
* 4.2.29 [RQ.SRS-007.LDAP.Configuration.User.RBAC](#rqsrs-007ldapconfigurationuserrbac)
* 4.2.30 [RQ.SRS-007.LDAP.Configuration.User.Syntax](#rqsrs-007ldapconfigurationusersyntax)
* 4.2.31 [RQ.SRS-007.LDAP.Configuration.User.Name.Empty](#rqsrs-007ldapconfigurationusernameempty)
* 4.2.32 [RQ.SRS-007.LDAP.Configuration.User.BothPasswordAndLDAP](#rqsrs-007ldapconfigurationuserbothpasswordandldap)
* 4.2.33 [RQ.SRS-007.LDAP.Configuration.User.LDAP.InvalidServerName.NotDefined](#rqsrs-007ldapconfigurationuserldapinvalidservernamenotdefined)
* 4.2.34 [RQ.SRS-007.LDAP.Configuration.User.LDAP.InvalidServerName.Empty](#rqsrs-007ldapconfigurationuserldapinvalidservernameempty)
* 4.2.35 [RQ.SRS-007.LDAP.Configuration.User.OnlyOneServer](#rqsrs-007ldapconfigurationuseronlyoneserver)
* 4.2.36 [RQ.SRS-007.LDAP.Configuration.User.Name.Long](#rqsrs-007ldapconfigurationusernamelong)
* 4.2.37 [RQ.SRS-007.LDAP.Configuration.User.Name.UTF8](#rqsrs-007ldapconfigurationusernameutf8)
* 4.2.38 [RQ.SRS-007.LDAP.Authentication.Username.Empty](#rqsrs-007ldapauthenticationusernameempty)
* 4.2.39 [RQ.SRS-007.LDAP.Authentication.Username.Long](#rqsrs-007ldapauthenticationusernamelong)
* 4.2.40 [RQ.SRS-007.LDAP.Authentication.Username.UTF8](#rqsrs-007ldapauthenticationusernameutf8)
* 4.2.41 [RQ.SRS-007.LDAP.Authentication.Password.Empty](#rqsrs-007ldapauthenticationpasswordempty)
* 4.2.42 [RQ.SRS-007.LDAP.Authentication.Password.Long](#rqsrs-007ldapauthenticationpasswordlong)
* 4.2.43 [RQ.SRS-007.LDAP.Authentication.Password.UTF8](#rqsrs-007ldapauthenticationpasswordutf8)
* 5 [References](#references)
## Revision History
This document is stored in an electronic form using [Git] source control management software
hosted in a [GitHub Repository].
All the updates are tracked using the [Git]'s [Revision History].
## Introduction
[ClickHouse] currently does not have any integration with [LDAP].
As the initial step in integrating with [LDAP] this software requirements specification covers
only the requirements to enable authentication of users using an [LDAP] server.
## Terminology
* **CA** -
Certificate Authority ([CA])
* **LDAP** -
Lightweight Directory Access Protocol ([LDAP])
## Requirements
### Generic
#### RQ.SRS-007.LDAP.Authentication
version: 1.0
[ClickHouse] SHALL support user authentication via an [LDAP] server.
#### RQ.SRS-007.LDAP.Authentication.MultipleServers
version: 1.0
[ClickHouse] SHALL support specifying multiple [LDAP] servers that can be used to authenticate
users.
#### RQ.SRS-007.LDAP.Authentication.Protocol.PlainText
version: 1.0
[ClickHouse] SHALL support user authentication using plain text `ldap://` non secure protocol.
#### RQ.SRS-007.LDAP.Authentication.Protocol.TLS
version: 1.0
[ClickHouse] SHALL support user authentication using `SSL/TLS` `ldaps://` secure protocol.
#### RQ.SRS-007.LDAP.Authentication.Protocol.StartTLS
version: 1.0
[ClickHouse] SHALL support user authentication using legacy `StartTLS` protocol which is a
plain text `ldap://` protocol that is upgraded to [TLS].
#### RQ.SRS-007.LDAP.Authentication.TLS.Certificate.Validation
version: 1.0
[ClickHouse] SHALL support certificate validation used for [TLS] connections.
#### RQ.SRS-007.LDAP.Authentication.TLS.Certificate.SelfSigned
version: 1.0
[ClickHouse] SHALL support self-signed certificates for [TLS] connections.
#### RQ.SRS-007.LDAP.Authentication.TLS.Certificate.SpecificCertificationAuthority
version: 1.0
[ClickHouse] SHALL support certificates signed by specific Certification Authority for [TLS] connections.
#### RQ.SRS-007.LDAP.Server.Configuration.Invalid
version: 1.0
[ClickHouse] SHALL return an error and prohibit user login if [LDAP] server configuration is not valid.
#### RQ.SRS-007.LDAP.User.Configuration.Invalid
version: 1.0
[ClickHouse] SHALL return an error and prohibit user login if user configuration is not valid.
#### RQ.SRS-007.LDAP.Authentication.Mechanism.Anonymous
version: 1.0
[ClickHouse] SHALL return an error and prohibit authentication using [Anonymous Authentication Mechanism of Simple Bind]
authentication mechanism.
#### RQ.SRS-007.LDAP.Authentication.Mechanism.Unauthenticated
version: 1.0
[ClickHouse] SHALL return an error and prohibit authentication using [Unauthenticated Authentication Mechanism of Simple Bind]
authentication mechanism.
#### RQ.SRS-007.LDAP.Authentication.Mechanism.NamePassword
version: 1.0
[ClickHouse] SHALL allow authentication using only [Name/Password Authentication Mechanism of Simple Bind]
authentication mechanism.
#### RQ.SRS-007.LDAP.Authentication.Valid
version: 1.0
[ClickHouse] SHALL only allow user authentication using [LDAP] server if and only if
user name and password match [LDAP] server records for the user.
#### RQ.SRS-007.LDAP.Authentication.Invalid
version: 1.0
[ClickHouse] SHALL return an error and prohibit authentication if either user name or password
do not match [LDAP] server records for the user.
#### RQ.SRS-007.LDAP.Authentication.Invalid.DeletedUser
version: 1.0
[ClickHouse] SHALL return an error and prohibit authentication if the user
has been deleted from the [LDAP] server.
#### RQ.SRS-007.LDAP.Authentication.UsernameChanged
version: 1.0
[ClickHouse] SHALL return an error and prohibit authentication if the username is changed
on the [LDAP] server.
#### RQ.SRS-007.LDAP.Authentication.PasswordChanged
version: 1.0
[ClickHouse] SHALL return an error and prohibit authentication if the password
for the user is changed on the [LDAP] server.
#### RQ.SRS-007.LDAP.Authentication.LDAPServerRestart
version: 1.0
[ClickHouse] SHALL support authenticating users after [LDAP] server is restarted.
#### RQ.SRS-007.LDAP.Authentication.ClickHouseServerRestart
version: 1.0
[ClickHouse] SHALL support authenticating users after server is restarted.
#### RQ.SRS-007.LDAP.Authentication.Parallel
version: 1.0
[ClickHouse] SHALL support parallel authentication of users using [LDAP] server.
#### RQ.SRS-007.LDAP.Authentication.Parallel.ValidAndInvalid
version: 1.0
[ClickHouse] SHALL support authentication of valid users and
prohibit authentication of invalid users using [LDAP] server
in parallel without having invalid attempts affecting valid authentications.
### Specific
#### RQ.SRS-007.LDAP.UnreachableServer
version: 1.0
[ClickHouse] SHALL return an error and prohibit user login if [LDAP] server is unreachable.
#### RQ.SRS-007.LDAP.Configuration.Server.Name
version: 1.0
[ClickHouse] SHALL not support empty string as a server name.
#### RQ.SRS-007.LDAP.Configuration.Server.Host
version: 1.0
[ClickHouse] SHALL support `<host>` parameter to specify [LDAP]
server hostname or IP, this parameter SHALL be mandatory and SHALL not be empty.
#### RQ.SRS-007.LDAP.Configuration.Server.Port
version: 1.0
[ClickHouse] SHALL support `<port>` parameter to specify [LDAP] server port.
#### RQ.SRS-007.LDAP.Configuration.Server.Port.Default
version: 1.0
[ClickHouse] SHALL use default port number `636` if `enable_tls` is set to `yes` or `389` otherwise.
#### RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Prefix
version: 1.0
[ClickHouse] SHALL support `<auth_dn_prefix>` parameter to specify the prefix
of value used to construct the DN to bound to during authentication via [LDAP] server.
#### RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Suffix
version: 1.0
[ClickHouse] SHALL support `<auth_dn_suffix>` parameter to specify the suffix
of value used to construct the DN to bound to during authentication via [LDAP] server.
#### RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Value
version: 1.0
[ClickHouse] SHALL construct DN as `auth_dn_prefix + escape(user_name) + auth_dn_suffix` string.
> This implies that auth_dn_suffix should usually have comma ',' as its first non-space character.
#### RQ.SRS-007.LDAP.Configuration.Server.EnableTLS
version: 1.0
[ClickHouse] SHALL support `<enable_tls>` parameter to trigger the use of secure connection to the [LDAP] server.
#### RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.Default
version: 1.0
[ClickHouse] SHALL use `yes` value as the default for `<enable_tls>` parameter
to enable SSL/TLS `ldaps://` protocol.
#### RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.No
version: 1.0
[ClickHouse] SHALL support specifying `no` as the value of `<enable_tls>` parameter to enable
plain text `ldap://` protocol.
#### RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.Yes
version: 1.0
[ClickHouse] SHALL support specifying `yes` as the value of `<enable_tls>` parameter to enable
SSL/TLS `ldaps://` protocol.
#### RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.StartTLS
version: 1.0
[ClickHouse] SHALL support specifying `starttls` as the value of `<enable_tls>` parameter to enable
legacy `StartTLS` protocol that used plain text `ldap://` protocol, upgraded to [TLS].
#### RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion
version: 1.0
[ClickHouse] SHALL support `<tls_minimum_protocol_version>` parameter to specify
the minimum protocol version of SSL/TLS.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion.Values
version: 1.0
[ClickHouse] SHALL support specifying `ssl2`, `ssl3`, `tls1.0`, `tls1.1`, and `tls1.2`
as a value of the `<tls_minimum_protocol_version>` parameter.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion.Default
version: 1.0
[ClickHouse] SHALL set `tls1.2` as the default value of the `<tls_minimum_protocol_version>` parameter.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert
version: 1.0
[ClickHouse] SHALL support `<tls_require_cert>` parameter to specify [TLS] peer
certificate verification behavior.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Default
version: 1.0
[ClickHouse] SHALL use `demand` value as the default for the `<tls_require_cert>` parameter.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Demand
version: 1.0
[ClickHouse] SHALL support specifying `demand` as the value of `<tls_require_cert>` parameter to
enable requesting of client certificate. If no certificate is provided, or a bad certificate is
provided, the session SHALL be immediately terminated.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Allow
version: 1.0
[ClickHouse] SHALL support specifying `allow` as the value of `<tls_require_cert>` parameter to
enable requesting of client certificate. If no
certificate is provided, the session SHALL proceed normally.
If a bad certificate is provided, it SHALL be ignored and the session SHALL proceed normally.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Try
version: 1.0
[ClickHouse] SHALL support specifying `try` as the value of `<tls_require_cert>` parameter to
enable requesting of client certificate. If no certificate is provided, the session
SHALL proceed normally. If a bad certificate is provided, the session SHALL be
immediately terminated.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Never
version: 1.0
[ClickHouse] SHALL support specifying `never` as the value of `<tls_require_cert>` parameter to
disable requesting of client certificate.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSCertFile
version: 1.0
[ClickHouse] SHALL support `<tls_cert_file>` to specify the path to certificate file used by
[ClickHouse] to establish connection with the [LDAP] server.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSKeyFile
version: 1.0
[ClickHouse] SHALL support `<tls_key_file>` to specify the path to key file for the certificate
specified by the `<tls_cert_file>` parameter.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSCACertDir
version: 1.0
[ClickHouse] SHALL support `<tls_ca_cert_dir>` parameter to specify to a path to
the directory containing [CA] certificates used to verify certificates provided by the [LDAP] server.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSCACertFile
version: 1.0
[ClickHouse] SHALL support `<tls_ca_cert_file>` parameter to specify a path to a specific
[CA] certificate file used to verify certificates provided by the [LDAP] server.
#### RQ.SRS-007.LDAP.Configuration.Server.TLSCipherSuite
version: 1.0
[ClickHouse] SHALL support `tls_cipher_suite` parameter to specify allowed cipher suites.
The value SHALL use the same format as the `ciphersuites` in the [OpenSSL Ciphers].
For example,
```xml
<tls_cipher_suite>ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:AES256-GCM-SHA384</tls_cipher_suite>
```
The available suites SHALL depend on the [OpenSSL] library version and variant used to build
[ClickHouse] and therefore might change.
#### RQ.SRS-007.LDAP.Configuration.Server.Syntax
version: 1.0
[ClickHouse] SHALL support the following example syntax to create an entry for an [LDAP] server inside the `config.xml`
configuration file or of any configuration file inside the `config.d` directory.
```xml
<yandex>
<my_ldap_server>
<host>localhost</host>
<port>636</port>
<auth_dn_prefix>cn=</auth_dn_prefix>
<auth_dn_suffix>, ou=users, dc=example, dc=com</auth_dn_suffix>
<enable_tls>yes</enable_tls>
<tls_minimum_protocol_version>tls1.2</tls_minimum_protocol_version>
<tls_require_cert>demand</tls_require_cert>
<tls_cert_file>/path/to/tls_cert_file</tls_cert_file>
<tls_key_file>/path/to/tls_key_file</tls_key_file>
<tls_ca_cert_file>/path/to/tls_ca_cert_file</tls_ca_cert_file>
<tls_ca_cert_dir>/path/to/tls_ca_cert_dir</tls_ca_cert_dir>
<tls_cipher_suite>ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:AES256-GCM-SHA384</tls_cipher_suite>
</my_ldap_server>
</yandex>
```
#### RQ.SRS-007.LDAP.Configuration.User.RBAC
version: 1.0
[ClickHouse] SHALL support creating users identified using an [LDAP] server using
the following RBAC command
```sql
CREATE USER name IDENTIFIED WITH ldap_server BY 'server_name'
```
#### RQ.SRS-007.LDAP.Configuration.User.Syntax
version: 1.0
[ClickHouse] SHALL support the following example syntax to create a user that is authenticated using
an [LDAP] server inside the `users.xml` file or any configuration file inside the `users.d` directory.
```xml
<yandex>
<users>
<user_name>
<ldap>
<server>my_ldap_server</server>
</ldap>
</user_name>
</users>
</yandex>
```
#### RQ.SRS-007.LDAP.Configuration.User.Name.Empty
version: 1.0
[ClickHouse] SHALL not support empty string as a user name.
#### RQ.SRS-007.LDAP.Configuration.User.BothPasswordAndLDAP
version: 1.0
[ClickHouse] SHALL throw an error if `<ldap>` is specified for the user and at the same
time user configuration contains any of the `<password*>` entries.
#### RQ.SRS-007.LDAP.Configuration.User.LDAP.InvalidServerName.NotDefined
version: 1.0
[ClickHouse] SHALL throw an error during any authentification attempt
if the name of the [LDAP] server used inside the `<ldap>` entry
is not defined in the `<ldap_servers>` section.
#### RQ.SRS-007.LDAP.Configuration.User.LDAP.InvalidServerName.Empty
version: 1.0
[ClickHouse] SHALL throw an error during any authentification attempt
if the name of the [LDAP] server used inside the `<ldap>` entry
is empty.
#### RQ.SRS-007.LDAP.Configuration.User.OnlyOneServer
version: 1.0
[ClickHouse] SHALL support specifying only one [LDAP] server for a given user.
#### RQ.SRS-007.LDAP.Configuration.User.Name.Long
version: 1.0
[ClickHouse] SHALL support long user names of at least 256 bytes
to specify users that can be authenticated using an [LDAP] server.
#### RQ.SRS-007.LDAP.Configuration.User.Name.UTF8
version: 1.0
[ClickHouse] SHALL support user names that contain [UTF-8] characters.
#### RQ.SRS-007.LDAP.Authentication.Username.Empty
version: 1.0
[ClickHouse] SHALL not support authenticating users with empty username.
#### RQ.SRS-007.LDAP.Authentication.Username.Long
version: 1.0
[ClickHouse] SHALL support authenticating users with a long username of at least 256 bytes.
#### RQ.SRS-007.LDAP.Authentication.Username.UTF8
version: 1.0
[ClickHouse] SHALL support authentication users with a username that contains [UTF-8] characters.
#### RQ.SRS-007.LDAP.Authentication.Password.Empty
version: 1.0
[ClickHouse] SHALL not support authenticating users with empty passwords
even if an empty password is valid for the user and
is allowed by the [LDAP] server.
#### RQ.SRS-007.LDAP.Authentication.Password.Long
version: 1.0
[ClickHouse] SHALL support long password of at least 256 bytes
that can be used to authenticate users using an [LDAP] server.
#### RQ.SRS-007.LDAP.Authentication.Password.UTF8
version: 1.0
[ClickHouse] SHALL support [UTF-8] characters in passwords
used to authenticate users using an [LDAP] server.
## References
* **ClickHouse:** https://clickhouse.tech
* **GitHub repository:** https://github.com/ClickHouse/ClickHouse/blob/master/tests/testflows/ldap/requirements/requirements.md
* **Revision history:** https://github.com/ClickHouse/ClickHouse/commits/master/tests/testflows/ldap/requirements/requirements.md
* **Git:** https://git-scm.com/
[Anonymous Authentication Mechanism of Simple Bind]: https://ldapwiki.com/wiki/Simple%20Authentication#section-Simple+Authentication-AnonymousAuthenticationMechanismOfSimpleBind
[Unauthenticated Authentication Mechanism of Simple Bind]: https://ldapwiki.com/wiki/Simple%20Authentication#section-Simple+Authentication-UnauthenticatedAuthenticationMechanismOfSimpleBind
[Name/Password Authentication Mechanism of Simple Bind]: https://ldapwiki.com/wiki/Simple%20Authentication#section-Simple+Authentication-NamePasswordAuthenticationMechanismOfSimpleBind
[UTF-8]: https://en.wikipedia.org/wiki/UTF-8
[OpenSSL]: https://www.openssl.org/
[OpenSSL Ciphers]: https://www.openssl.org/docs/manmaster/man1/openssl-ciphers.html
[CA]: https://en.wikipedia.org/wiki/Certificate_authority
[TLS]: https://en.wikipedia.org/wiki/Transport_Layer_Security
[LDAP]: https://en.wikipedia.org/wiki/Lightweight_Directory_Access_Protocol
[ClickHouse]: https://clickhouse.tech
[GitHub]: https://github.com
[GitHub Repository]: https://github.com/ClickHouse/ClickHouse/blob/master/tests/testflows/ldap/requirements/requirements.md
[Revision History]: https://github.com/ClickHouse/ClickHouse/commits/master/tests/testflows/ldap/requirements/requirements.md
[Git]: https://git-scm.com/