ClickHouse/tests/testflows/ldap/authentication/requirements/requirements.py

# These requirements were auto generated
# from software requirements specification (SRS)
# document by TestFlows v1.6.201216.1172002.
# Do not edit by hand but re-generate instead
# using 'tfs requirements generate' command.
from testflows.core import Specification
from testflows.core import Requirement

Heading = Specification.Heading

RQ_SRS_007_LDAP_Authentication = Requirement(
    name='RQ.SRS-007.LDAP.Authentication',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support user authentication via an [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.1')

RQ_SRS_007_LDAP_Authentication_MultipleServers = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.MultipleServers',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support specifying multiple [LDAP] servers that can be used to authenticate\n'
        'users.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.2')

RQ_SRS_007_LDAP_Authentication_Protocol_PlainText = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Protocol.PlainText',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support user authentication using plain text `ldap://` non secure protocol.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.3')

RQ_SRS_007_LDAP_Authentication_Protocol_TLS = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Protocol.TLS',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support user authentication using `SSL/TLS` `ldaps://` secure protocol.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.4')

RQ_SRS_007_LDAP_Authentication_Protocol_StartTLS = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Protocol.StartTLS',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support user authentication using legacy `StartTLS` protocol which is a\n'
        'plain text `ldap://` protocol that is upgraded to [TLS].\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.5')

RQ_SRS_007_LDAP_Authentication_TLS_Certificate_Validation = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.TLS.Certificate.Validation',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support certificate validation used for [TLS] connections.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.6')

RQ_SRS_007_LDAP_Authentication_TLS_Certificate_SelfSigned = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.TLS.Certificate.SelfSigned',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support self-signed certificates for [TLS] connections.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.7')

RQ_SRS_007_LDAP_Authentication_TLS_Certificate_SpecificCertificationAuthority = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.TLS.Certificate.SpecificCertificationAuthority',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support certificates signed by specific Certification Authority for [TLS] connections.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.8')

RQ_SRS_007_LDAP_Server_Configuration_Invalid = Requirement(
    name='RQ.SRS-007.LDAP.Server.Configuration.Invalid',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL return an error and prohibit user login if [LDAP] server configuration is not valid.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.9')

RQ_SRS_007_LDAP_User_Configuration_Invalid = Requirement(
    name='RQ.SRS-007.LDAP.User.Configuration.Invalid',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL return an error and prohibit user login if user configuration is not valid.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.10')

RQ_SRS_007_LDAP_Authentication_Mechanism_Anonymous = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Mechanism.Anonymous',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL return an error and prohibit authentication using [Anonymous Authentication Mechanism of Simple Bind]\n'
        'authentication mechanism.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.11')

RQ_SRS_007_LDAP_Authentication_Mechanism_Unauthenticated = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Mechanism.Unauthenticated',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL return an error and prohibit authentication using [Unauthenticated Authentication Mechanism of Simple Bind]\n'
        'authentication mechanism.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.12')

RQ_SRS_007_LDAP_Authentication_Mechanism_NamePassword = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Mechanism.NamePassword',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL allow authentication using only [Name/Password Authentication Mechanism of Simple Bind]\n'
        'authentication mechanism.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.13')

RQ_SRS_007_LDAP_Authentication_Valid = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Valid',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL only allow user authentication using [LDAP] server if and only if\n'
        'user name and password match [LDAP] server records for the user.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.14')

RQ_SRS_007_LDAP_Authentication_Invalid = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Invalid',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL return an error and prohibit authentication if either user name or password\n'
        'do not match [LDAP] server records for the user.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.15')

RQ_SRS_007_LDAP_Authentication_Invalid_DeletedUser = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Invalid.DeletedUser',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL return an error and prohibit authentication if the user\n'
        'has been deleted from the [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.16')

RQ_SRS_007_LDAP_Authentication_UsernameChanged = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.UsernameChanged',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL return an error and prohibit authentication if the username is changed\n'
        'on the [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.17')

RQ_SRS_007_LDAP_Authentication_PasswordChanged = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.PasswordChanged',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL return an error and prohibit authentication if the password\n'
        'for the user is changed on the [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.18')

RQ_SRS_007_LDAP_Authentication_LDAPServerRestart = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.LDAPServerRestart',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support authenticating users after [LDAP] server is restarted.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.19')

RQ_SRS_007_LDAP_Authentication_ClickHouseServerRestart = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.ClickHouseServerRestart',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support authenticating users after server is restarted.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.20')

RQ_SRS_007_LDAP_Authentication_Parallel = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Parallel',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support parallel authentication of users using [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.21')

RQ_SRS_007_LDAP_Authentication_Parallel_ValidAndInvalid = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Parallel.ValidAndInvalid',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support authentication of valid users and\n'
        'prohibit authentication of invalid users using [LDAP] server\n'
        'in parallel without having invalid attempts affecting valid authentications.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.1.22')

RQ_SRS_007_LDAP_UnreachableServer = Requirement(
    name='RQ.SRS-007.LDAP.UnreachableServer',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL return an error and prohibit user login if [LDAP] server is unreachable.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.1')

RQ_SRS_007_LDAP_Configuration_Server_Name = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.Name',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL not support empty string as a server name.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.2')

RQ_SRS_007_LDAP_Configuration_Server_Host = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.Host',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `<host>` parameter to specify [LDAP]\n'
        'server hostname or IP, this parameter SHALL be mandatory and SHALL not be empty.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.3')

RQ_SRS_007_LDAP_Configuration_Server_Port = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.Port',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `<port>` parameter to specify [LDAP] server port.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.4')

RQ_SRS_007_LDAP_Configuration_Server_Port_Default = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.Port.Default',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL use default port number `636` if `enable_tls` is set to `yes` or `389` otherwise.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.5')

RQ_SRS_007_LDAP_Configuration_Server_AuthDN_Prefix = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Prefix',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `<auth_dn_prefix>` parameter to specify the prefix\n'
        'of value used to construct the DN to bound to during authentication via [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.6')

RQ_SRS_007_LDAP_Configuration_Server_AuthDN_Suffix = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Suffix',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `<auth_dn_suffix>` parameter to specify the suffix\n'
        'of value used to construct the DN to bound to during authentication via [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.7')

RQ_SRS_007_LDAP_Configuration_Server_AuthDN_Value = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Value',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL construct DN as  `auth_dn_prefix + escape(user_name) + auth_dn_suffix` string.\n'
        '\n'
        "> This implies that auth_dn_suffix should usually have comma ',' as its first non-space character.\n"
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.8')

RQ_SRS_007_LDAP_Configuration_Server_EnableTLS = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.EnableTLS',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `<enable_tls>` parameter to trigger the use of secure connection to the [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.9')

RQ_SRS_007_LDAP_Configuration_Server_EnableTLS_Options_Default = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.Default',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL use `yes` value as the default for `<enable_tls>` parameter\n'
        'to enable SSL/TLS `ldaps://` protocol.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.10')

RQ_SRS_007_LDAP_Configuration_Server_EnableTLS_Options_No = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.No',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support specifying `no` as the value of `<enable_tls>` parameter to enable\n'
        'plain text `ldap://` protocol.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.11')

RQ_SRS_007_LDAP_Configuration_Server_EnableTLS_Options_Yes = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.Yes',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support specifying `yes` as the value of `<enable_tls>` parameter to enable\n'
        'SSL/TLS `ldaps://` protocol.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.12')

RQ_SRS_007_LDAP_Configuration_Server_EnableTLS_Options_StartTLS = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.StartTLS',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support specifying `starttls` as the value of `<enable_tls>` parameter to enable\n'
        'legacy `StartTLS` protocol that used plain text `ldap://` protocol, upgraded to [TLS].\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.13')

RQ_SRS_007_LDAP_Configuration_Server_TLSMinimumProtocolVersion = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `<tls_minimum_protocol_version>` parameter to specify\n'
        'the minimum protocol version of SSL/TLS.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.14')

RQ_SRS_007_LDAP_Configuration_Server_TLSMinimumProtocolVersion_Values = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion.Values',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support specifying `ssl2`, `ssl3`, `tls1.0`, `tls1.1`, and `tls1.2`\n'
        'as a value of the `<tls_minimum_protocol_version>` parameter.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.15')

RQ_SRS_007_LDAP_Configuration_Server_TLSMinimumProtocolVersion_Default = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion.Default',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL set `tls1.2` as the default value of the `<tls_minimum_protocol_version>` parameter.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.16')

RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `<tls_require_cert>` parameter to specify [TLS] peer\n'
        'certificate verification behavior.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.17')

RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert_Options_Default = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Default',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL use `demand` value as the default for the `<tls_require_cert>` parameter.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.18')

RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert_Options_Demand = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Demand',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support specifying `demand` as the value of `<tls_require_cert>` parameter to\n'
        'enable requesting of client certificate.  If no certificate  is  provided,  or  a  bad   certificate   is\n'
        'provided, the session SHALL be immediately terminated.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.19')

RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert_Options_Allow = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Allow',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support specifying `allow` as the value of `<tls_require_cert>` parameter to\n'
        'enable requesting of client certificate. If no\n'
        'certificate is provided, the session SHALL proceed normally.\n'
        'If a bad certificate is provided, it SHALL be ignored and the session SHALL proceed normally.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.20')

RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert_Options_Try = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Try',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support specifying `try` as the value of `<tls_require_cert>` parameter to\n'
        'enable requesting of client certificate. If no certificate is provided, the session\n'
        'SHALL proceed  normally.  If a bad certificate is provided, the session SHALL be\n'
        'immediately terminated.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.21')

RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert_Options_Never = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Never',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support specifying `never` as the value of `<tls_require_cert>` parameter to\n'
        'disable requesting of client certificate.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.22')

RQ_SRS_007_LDAP_Configuration_Server_TLSCertFile = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSCertFile',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `<tls_cert_file>` to specify the path to certificate file used by\n'
        '[ClickHouse] to establish connection with the [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.23')

RQ_SRS_007_LDAP_Configuration_Server_TLSKeyFile = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSKeyFile',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `<tls_key_file>` to specify the path to key file for the certificate\n'
        'specified by the `<tls_cert_file>` parameter.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.24')

RQ_SRS_007_LDAP_Configuration_Server_TLSCACertDir = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSCACertDir',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `<tls_ca_cert_dir>` parameter to specify to a path to\n'
        'the directory containing [CA] certificates used to verify certificates provided by the [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.25')

RQ_SRS_007_LDAP_Configuration_Server_TLSCACertFile = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSCACertFile',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `<tls_ca_cert_file>` parameter to specify a path to a specific\n'
        '[CA] certificate file used to verify certificates provided by the [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.26')

RQ_SRS_007_LDAP_Configuration_Server_TLSCipherSuite = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.TLSCipherSuite',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support `tls_cipher_suite` parameter to specify allowed cipher suites.\n'
        'The value SHALL use the same format as the `ciphersuites` in the [OpenSSL Ciphers].\n'
        '\n'
        'For example,\n'
        '\n'
        '```xml\n'
        '<tls_cipher_suite>ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:AES256-GCM-SHA384</tls_cipher_suite>\n'
        '```\n'
        '\n'
        'The available suites SHALL depend on the [OpenSSL] library version and variant used to build\n'
        '[ClickHouse] and therefore might change.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.27')

RQ_SRS_007_LDAP_Configuration_Server_Syntax = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.Server.Syntax',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support the following example syntax to create an entry for an [LDAP] server inside the `config.xml`\n'
        'configuration file or of any configuration file inside the `config.d` directory.\n'
        '\n'
        '```xml\n'
        '<yandex>\n'
        '    <my_ldap_server>\n'
        '        <host>localhost</host>\n'
        '        <port>636</port>\n'
        '        <auth_dn_prefix>cn=</auth_dn_prefix>\n'
        '        <auth_dn_suffix>, ou=users, dc=example, dc=com</auth_dn_suffix>\n'
        '        <enable_tls>yes</enable_tls>\n'
        '        <tls_minimum_protocol_version>tls1.2</tls_minimum_protocol_version>\n'
        '        <tls_require_cert>demand</tls_require_cert>\n'
        '        <tls_cert_file>/path/to/tls_cert_file</tls_cert_file>\n'
        '        <tls_key_file>/path/to/tls_key_file</tls_key_file>\n'
        '        <tls_ca_cert_file>/path/to/tls_ca_cert_file</tls_ca_cert_file>\n'
        '        <tls_ca_cert_dir>/path/to/tls_ca_cert_dir</tls_ca_cert_dir>\n'
        '        <tls_cipher_suite>ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:AES256-GCM-SHA384</tls_cipher_suite>\n'
        '    </my_ldap_server>\n'
        '</yandex>\n'
        '```\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.28')

RQ_SRS_007_LDAP_Configuration_User_RBAC = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.User.RBAC',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support creating users identified using an [LDAP] server using\n'
        'the following RBAC command\n'
        '\n'
        '```sql\n'
        "CREATE USER name IDENTIFIED WITH ldap_server BY 'server_name'\n"
        '```\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.29')

RQ_SRS_007_LDAP_Configuration_User_Syntax = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.User.Syntax',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support the following example syntax to create a user that is authenticated using\n'
        'an [LDAP] server inside the `users.xml` file or any configuration file inside the `users.d` directory.\n'
        '\n'
        '```xml\n'
        '<yandex>\n'
        '    <users>\n'
        '        <user_name>\n'
        '            <ldap>\n'
        '                <server>my_ldap_server</server>\n'
        '            </ldap>\n'
        '        </user_name>\n'
        '    </users>\n'
        '</yandex>\n'
        '```\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.30')

RQ_SRS_007_LDAP_Configuration_User_Name_Empty = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.User.Name.Empty',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL not support empty string as a user name.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.31')

RQ_SRS_007_LDAP_Configuration_User_BothPasswordAndLDAP = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.User.BothPasswordAndLDAP',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL throw an error if `<ldap>` is specified for the user and at the same\n'
        'time user configuration contains any of the `<password*>` entries.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.32')

RQ_SRS_007_LDAP_Configuration_User_LDAP_InvalidServerName_NotDefined = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.User.LDAP.InvalidServerName.NotDefined',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL throw an error during any authentication attempt\n'
        'if the name of the [LDAP] server used inside the `<ldap>` entry\n'
        'is not defined in the `<ldap_servers>` section.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.33')

RQ_SRS_007_LDAP_Configuration_User_LDAP_InvalidServerName_Empty = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.User.LDAP.InvalidServerName.Empty',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL throw an error during any authentication attempt\n'
        'if the name of the [LDAP] server used inside the `<ldap>` entry\n'
        'is empty.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.34')

RQ_SRS_007_LDAP_Configuration_User_OnlyOneServer = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.User.OnlyOneServer',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support specifying only one [LDAP] server for a given user.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.35')

RQ_SRS_007_LDAP_Configuration_User_Name_Long = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.User.Name.Long',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support long user names of at least 256 bytes\n'
        'to specify users that can be authenticated using an [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.36')

RQ_SRS_007_LDAP_Configuration_User_Name_UTF8 = Requirement(
    name='RQ.SRS-007.LDAP.Configuration.User.Name.UTF8',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support user names that contain [UTF-8] characters.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.37')

RQ_SRS_007_LDAP_Authentication_Username_Empty = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Username.Empty',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL not support authenticating users with empty username.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.38')

RQ_SRS_007_LDAP_Authentication_Username_Long = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Username.Long',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support authenticating users with a long username of at least 256 bytes.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.39')

RQ_SRS_007_LDAP_Authentication_Username_UTF8 = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Username.UTF8',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support authentication users with a username that contains [UTF-8] characters.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.40')

RQ_SRS_007_LDAP_Authentication_Password_Empty = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Password.Empty',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL not support authenticating users with empty passwords\n'
        'even if an empty password is valid for the user and\n'
        'is allowed by the [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.41')

RQ_SRS_007_LDAP_Authentication_Password_Long = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Password.Long',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support long password of at least 256 bytes\n'
        'that can be used to authenticate users using an [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.42')

RQ_SRS_007_LDAP_Authentication_Password_UTF8 = Requirement(
    name='RQ.SRS-007.LDAP.Authentication.Password.UTF8',
    version='1.0',
    priority=None,
    group=None,
    type=None,
    uid=None,
    description=(
        '[ClickHouse] SHALL support [UTF-8] characters in passwords\n'
        'used to authenticate users using an [LDAP] server.\n'
        '\n'
        ),
    link=None,
    level=3,
    num='4.2.43')

SRS_007_ClickHouse_Authentication_of_Users_via_LDAP = Specification(
    name='SRS-007 ClickHouse Authentication of Users via LDAP', 
    description=None,
    author=None,
    date=None, 
    status=None, 
    approved_by=None,
    approved_date=None,
    approved_version=None,
    version=None,
    group=None,
    type=None,
    link=None,
    uid=None,
    parent=None,
    children=None,
    headings=(
        Heading(name='Revision History', level=1, num='1'),
        Heading(name='Introduction', level=1, num='2'),
        Heading(name='Terminology', level=1, num='3'),
        Heading(name='Requirements', level=1, num='4'),
        Heading(name='Generic', level=2, num='4.1'),
        Heading(name='RQ.SRS-007.LDAP.Authentication', level=3, num='4.1.1'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.MultipleServers', level=3, num='4.1.2'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Protocol.PlainText', level=3, num='4.1.3'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Protocol.TLS', level=3, num='4.1.4'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Protocol.StartTLS', level=3, num='4.1.5'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.TLS.Certificate.Validation', level=3, num='4.1.6'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.TLS.Certificate.SelfSigned', level=3, num='4.1.7'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.TLS.Certificate.SpecificCertificationAuthority', level=3, num='4.1.8'),
        Heading(name='RQ.SRS-007.LDAP.Server.Configuration.Invalid', level=3, num='4.1.9'),
        Heading(name='RQ.SRS-007.LDAP.User.Configuration.Invalid', level=3, num='4.1.10'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Mechanism.Anonymous', level=3, num='4.1.11'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Mechanism.Unauthenticated', level=3, num='4.1.12'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Mechanism.NamePassword', level=3, num='4.1.13'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Valid', level=3, num='4.1.14'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Invalid', level=3, num='4.1.15'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Invalid.DeletedUser', level=3, num='4.1.16'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.UsernameChanged', level=3, num='4.1.17'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.PasswordChanged', level=3, num='4.1.18'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.LDAPServerRestart', level=3, num='4.1.19'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.ClickHouseServerRestart', level=3, num='4.1.20'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Parallel', level=3, num='4.1.21'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Parallel.ValidAndInvalid', level=3, num='4.1.22'),
        Heading(name='Specific', level=2, num='4.2'),
        Heading(name='RQ.SRS-007.LDAP.UnreachableServer', level=3, num='4.2.1'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.Name', level=3, num='4.2.2'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.Host', level=3, num='4.2.3'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.Port', level=3, num='4.2.4'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.Port.Default', level=3, num='4.2.5'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Prefix', level=3, num='4.2.6'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Suffix', level=3, num='4.2.7'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.AuthDN.Value', level=3, num='4.2.8'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.EnableTLS', level=3, num='4.2.9'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.Default', level=3, num='4.2.10'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.No', level=3, num='4.2.11'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.Yes', level=3, num='4.2.12'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.EnableTLS.Options.StartTLS', level=3, num='4.2.13'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion', level=3, num='4.2.14'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion.Values', level=3, num='4.2.15'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSMinimumProtocolVersion.Default', level=3, num='4.2.16'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert', level=3, num='4.2.17'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Default', level=3, num='4.2.18'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Demand', level=3, num='4.2.19'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Allow', level=3, num='4.2.20'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Try', level=3, num='4.2.21'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSRequireCert.Options.Never', level=3, num='4.2.22'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSCertFile', level=3, num='4.2.23'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSKeyFile', level=3, num='4.2.24'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSCACertDir', level=3, num='4.2.25'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSCACertFile', level=3, num='4.2.26'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.TLSCipherSuite', level=3, num='4.2.27'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.Server.Syntax', level=3, num='4.2.28'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.User.RBAC', level=3, num='4.2.29'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.User.Syntax', level=3, num='4.2.30'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.User.Name.Empty', level=3, num='4.2.31'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.User.BothPasswordAndLDAP', level=3, num='4.2.32'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.User.LDAP.InvalidServerName.NotDefined', level=3, num='4.2.33'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.User.LDAP.InvalidServerName.Empty', level=3, num='4.2.34'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.User.OnlyOneServer', level=3, num='4.2.35'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.User.Name.Long', level=3, num='4.2.36'),
        Heading(name='RQ.SRS-007.LDAP.Configuration.User.Name.UTF8', level=3, num='4.2.37'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Username.Empty', level=3, num='4.2.38'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Username.Long', level=3, num='4.2.39'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Username.UTF8', level=3, num='4.2.40'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Password.Empty', level=3, num='4.2.41'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Password.Long', level=3, num='4.2.42'),
        Heading(name='RQ.SRS-007.LDAP.Authentication.Password.UTF8', level=3, num='4.2.43'),
        Heading(name='References', level=1, num='5'),
        ),
    requirements=(
        RQ_SRS_007_LDAP_Authentication,
        RQ_SRS_007_LDAP_Authentication_MultipleServers,
        RQ_SRS_007_LDAP_Authentication_Protocol_PlainText,
        RQ_SRS_007_LDAP_Authentication_Protocol_TLS,
        RQ_SRS_007_LDAP_Authentication_Protocol_StartTLS,
        RQ_SRS_007_LDAP_Authentication_TLS_Certificate_Validation,
        RQ_SRS_007_LDAP_Authentication_TLS_Certificate_SelfSigned,
        RQ_SRS_007_LDAP_Authentication_TLS_Certificate_SpecificCertificationAuthority,
        RQ_SRS_007_LDAP_Server_Configuration_Invalid,
        RQ_SRS_007_LDAP_User_Configuration_Invalid,
        RQ_SRS_007_LDAP_Authentication_Mechanism_Anonymous,
        RQ_SRS_007_LDAP_Authentication_Mechanism_Unauthenticated,
        RQ_SRS_007_LDAP_Authentication_Mechanism_NamePassword,
        RQ_SRS_007_LDAP_Authentication_Valid,
        RQ_SRS_007_LDAP_Authentication_Invalid,
        RQ_SRS_007_LDAP_Authentication_Invalid_DeletedUser,
        RQ_SRS_007_LDAP_Authentication_UsernameChanged,
        RQ_SRS_007_LDAP_Authentication_PasswordChanged,
        RQ_SRS_007_LDAP_Authentication_LDAPServerRestart,
        RQ_SRS_007_LDAP_Authentication_ClickHouseServerRestart,
        RQ_SRS_007_LDAP_Authentication_Parallel,
        RQ_SRS_007_LDAP_Authentication_Parallel_ValidAndInvalid,
        RQ_SRS_007_LDAP_UnreachableServer,
        RQ_SRS_007_LDAP_Configuration_Server_Name,
        RQ_SRS_007_LDAP_Configuration_Server_Host,
        RQ_SRS_007_LDAP_Configuration_Server_Port,
        RQ_SRS_007_LDAP_Configuration_Server_Port_Default,
        RQ_SRS_007_LDAP_Configuration_Server_AuthDN_Prefix,
        RQ_SRS_007_LDAP_Configuration_Server_AuthDN_Suffix,
        RQ_SRS_007_LDAP_Configuration_Server_AuthDN_Value,
        RQ_SRS_007_LDAP_Configuration_Server_EnableTLS,
        RQ_SRS_007_LDAP_Configuration_Server_EnableTLS_Options_Default,
        RQ_SRS_007_LDAP_Configuration_Server_EnableTLS_Options_No,
        RQ_SRS_007_LDAP_Configuration_Server_EnableTLS_Options_Yes,
        RQ_SRS_007_LDAP_Configuration_Server_EnableTLS_Options_StartTLS,
        RQ_SRS_007_LDAP_Configuration_Server_TLSMinimumProtocolVersion,
        RQ_SRS_007_LDAP_Configuration_Server_TLSMinimumProtocolVersion_Values,
        RQ_SRS_007_LDAP_Configuration_Server_TLSMinimumProtocolVersion_Default,
        RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert,
        RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert_Options_Default,
        RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert_Options_Demand,
        RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert_Options_Allow,
        RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert_Options_Try,
        RQ_SRS_007_LDAP_Configuration_Server_TLSRequireCert_Options_Never,
        RQ_SRS_007_LDAP_Configuration_Server_TLSCertFile,
        RQ_SRS_007_LDAP_Configuration_Server_TLSKeyFile,
        RQ_SRS_007_LDAP_Configuration_Server_TLSCACertDir,
        RQ_SRS_007_LDAP_Configuration_Server_TLSCACertFile,
        RQ_SRS_007_LDAP_Configuration_Server_TLSCipherSuite,
        RQ_SRS_007_LDAP_Configuration_Server_Syntax,
        RQ_SRS_007_LDAP_Configuration_User_RBAC,
        RQ_SRS_007_LDAP_Configuration_User_Syntax,
        RQ_SRS_007_LDAP_Configuration_User_Name_Empty,
        RQ_SRS_007_LDAP_Configuration_User_BothPasswordAndLDAP,
        RQ_SRS_007_LDAP_Configuration_User_LDAP_InvalidServerName_NotDefined,
        RQ_SRS_007_LDAP_Configuration_User_LDAP_InvalidServerName_Empty,
        RQ_SRS_007_LDAP_Configuration_User_OnlyOneServer,
        RQ_SRS_007_LDAP_Configuration_User_Name_Long,
        RQ_SRS_007_LDAP_Configuration_User_Name_UTF8,
        RQ_SRS_007_LDAP_Authentication_Username_Empty,
        RQ_SRS_007_LDAP_Authentication_Username_Long,
        RQ_SRS_007_LDAP_Authentication_Username_UTF8,
        RQ_SRS_007_LDAP_Authentication_Password_Empty,
        RQ_SRS_007_LDAP_Authentication_Password_Long,
        RQ_SRS_007_LDAP_Authentication_Password_UTF8,
        ),
    content='''
# 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 authentication 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 authentication 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

[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/authentication/requirements/requirements.md
[Revision History]: https://github.com/ClickHouse/ClickHouse/commits/master/tests/testflows/ldap/authentication/requirements/requirements.md
[Git]: https://git-scm.com/
''')