LDAP.CONF

NAME

SYNOPSIS

DESCRIPTION

The ldap.conf configuration file is used to set system-wide defaults to be applied when running ldap clients.

Users may create an optional configuration file, ldaprc or .ldaprc, in their home directory which will be used to override the system-wide defaults file. The file ldaprc in the current working directory is also used.

Additional configuration files can be specified using the LDAPCONF and LDAPRC environment variables. LDAPCONF may be set to the path of a configuration file. This path can be absolute or relative to the current working directory. The LDAPRC, if defined, should be the basename of a file in the current working directory or in the user's home directory.

Environmental variables may also be used to augment the file based defaults. The name of the variable is the option name with an added prefix of LDAP. For example, to define BASE via the environment, set the variable LDAPBASE to the desired value.

Some options are user-only. Such options are ignored if present in the ldap.conf (or file specified by LDAPCONF).

Thus the following files and variables are read, in order:

    variable     $LDAPNOINIT, and if that is not set:
    system file  /etc/openldap/ldap.conf,
    user files   $HOME/ldaprc,  $HOME/.ldaprc,  ./ldaprc,
    system file  $LDAPCONF,
    user files   $HOME/$LDAPRC, $HOME/.$LDAPRC, ./$LDAPRC,
    variables    $LDAP<option-name>.

OPTIONS

Blank lines and lines beginning with a hash mark (`#') are ignored up to their end.

Valid lines are made of an option's name (a sequence of non-blanks, conventionally written in uppercase, although not required), followed by a value. The value starts with the first non-blank character after the option's name, and terminates at the end of the line, or at the last sequence of blanks before the end of the line. The tokenization of the value, if any, is delegated to the handler(s) for that option, if any. Quoting values that contain blanks may be incorrect, as the quotes would become part of the value. For example,

        URI     "ldap:// ldaps://"

is incorrect, while

        URI     ldap:// ldaps://

is correct (note the absence of the double quotes).

A line cannot be longer than LINE_MAX, which should be more than 2000 bytes on all platforms. There is no mechanism to split a long line on multiple lines, either for beautification or to overcome the above limit.

The different configuration options are:

URI <ldap[si]://[name[:port]] ...>

Specifies the URI(s) of an LDAP server(s) to which the LDAP library should connect. The URI scheme may be any of ldap, ldaps or ldapi, which refer to LDAP over TCP, LDAP over SSL (TLS) and LDAP over IPC (UNIX domain sockets), respectively. Each server's name can be specified as a domain-style name or an IP address literal. Optionally, the server's name can followed by a ':' and the port number the LDAP server is listening on. If no port number is provided, the default port for the scheme is used (389 for ldap://, 636 for ldaps://). For LDAP over IPC, name is the name of the socket, and no port is required, nor allowed; note that directory separators must be URL-encoded, like any other characters that are special to URLs; so the socket

        /usr/local/var/ldapi

must be specified as

        ldapi://%2Fusr%2Flocal%2Fvar%2Fldapi

A space separated list of URIs may be provided.

BASE <base>

Specifies the default base DN to use when performing ldap operations. The base must be specified as a Distinguished Name in LDAP format.

BINDDN <dn>

Specifies the default bind DN to use when performing ldap operations. The bind DN must be specified as a Distinguished Name in LDAP format. This is a user-only option.

DEREF <when>

Specifies how alias dereferencing is done when performing a search. The <when> can be specified as one of the following keywords:

never

Aliases are never dereferenced. This is the default.

searching

Aliases are dereferenced in subordinates of the base object, but not in locating the base object of the search.

finding

Aliases are only dereferenced when locating the base object of the search.

always

Aliases are dereferenced both in searching and in locating the base object of the search.

HOST <name[:port] ...>

Specifies the name(s) of an LDAP server(s) to which the LDAP library should connect. Each server's name can be specified as a domain-style name or an IP address and optionally followed by a ':' and the port number the ldap server is listening on. A space separated list of hosts may be provided. HOST is deprecated in favor of URI.

NETWORK_TIMEOUT <integer>

Specifies the timeout (in seconds) after which the poll(2)/select(2) following a connect(2) returns in case of no activity.

PORT <port>

Specifies the default port used when connecting to LDAP servers(s). The port may be specified as a number. PORT is deprecated in favor of URI.

REFERRALS <on/true/yes/off/false/no>

Specifies if the client should automatically follow referrals returned by LDAP servers. The default is on. Note that the command line tools ldapsearch(1) &co always override this option.

SIZELIMIT <integer>

Specifies a size limit (number of entries) to use when performing searches. The number should be a non-negative integer. SIZELIMIT of zero (0) specifies a request for unlimited search size. Please note that the server may still apply any server-side limit on the amount of entries that can be returned by a search operation.

TIMELIMIT <integer>

Specifies a time limit (in seconds) to use when performing searches. The number should be a non-negative integer. TIMELIMIT of zero (0) specifies unlimited search time to be used. Please note that the server may still apply any server-side limit on the duration of a search operation. VERSION {2|3} Specifies what version of the LDAP protocol should be used.

TIMEOUT <integer>

Specifies a timeout (in seconds) after which calls to synchronous LDAP APIs will abort if no response is received. Also used for any ldap_result(3) calls where a NULL timeout parameter is supplied.

SASL OPTIONS

SASL_MECH <mechanism>

Specifies the SASL mechanism to use. This is a user-only option.

SASL_REALM <realm>

Specifies the SASL realm. This is a user-only option.

SASL_AUTHCID <authcid>

Specifies the authentication identity. This is a user-only option.

SASL_AUTHZID <authcid>

Specifies the proxy authorization identity. This is a user-only option.

SASL_SECPROPS <properties>

Specifies Cyrus SASL security properties. The <properties> can be specified as a comma-separated list of the following:

none

(without any other properties) causes the properties defaults ("noanonymous,noplain") to be cleared.

noplain

disables mechanisms susceptible to simple passive attacks.

noactive

disables mechanisms susceptible to active attacks.

nodict

disables mechanisms susceptible to passive dictionary attacks.

noanonymous

disables mechanisms which support anonymous login.

forwardsec

requires forward secrecy between sessions.

passcred

requires mechanisms which pass client credentials (and allows mechanisms which can pass credentials to do so).

minssf=<factor>

specifies the minimum acceptable security strength factor as an integer approximating the effective key length used for encryption. 0 (zero) implies no protection, 1 implies integrity protection only, 56 allows DES or other weak ciphers, 112 allows triple DES and other strong ciphers, 128 allows RC4, Blowfish and other modern strong ciphers. The default is 0.

maxssf=<factor>

specifies the maximum acceptable security strength factor as an integer (see minssf description). The default is INT_MAX.

maxbufsize=<factor>

specifies the maximum security layer receive buffer size allowed. 0 disables security layers. The default is 65536.

GSSAPI OPTIONS

GSSAPI_SIGN <on/true/yes/off/false/no>

Specifies if GSSAPI signing (GSS_C_INTEG_FLAG) should be used. The default is off.

GSSAPI_ENCRYPT <on/true/yes/off/false/no>

Specifies if GSSAPI encryption (GSS_C_INTEG_FLAG and GSS_C_CONF_FLAG) should be used. The default is off.

GSSAPI_ALLOW_REMOTE_PRINCIPAL <on/true/yes/off/false/no>

Specifies if GSSAPI based authentification should try to form the target principal name out of the ldapServiceName or dnsHostName attribute of the targets RootDSE entry. The default is off.

TLS OPTIONS

TLS_CACERT <filename>

Specifies the file that contains certificates for all of the Certificate Authorities the client will recognize.

TLS_CACERTDIR <path>

Specifies the path of a directory that contains Certificate Authority certificates in separate individual files. The TLS_CACERT is always used before TLS_CACERTDIR. The specified directory must be managed with the OpenSSL c_rehash utility. This parameter is ignored with GNUtls.

TLS_CERT <filename>

Specifies the file that contains the client certificate. This is a user-only option.

TLS_KEY <filename>

Specifies the file that contains the private key that matches the certificate stored in the TLS_CERT file. Currently, the private key must not be protected with a password, so it is of critical importance that the key file is protected carefully. This is a user-only option.

TLS_CIPHER_SUITE <cipher-suite-spec>

Specifies acceptable cipher suite and preference order. <cipher-suite-spec> should be a cipher specification for OpenSSL, e.g., HIGH:MEDIUM:+SSLv2.

To check what ciphers a given spec selects, use:

        openssl ciphers -v <cipher-suite-spec>

To obtain the list of ciphers in GNUtls use:

        gnutls-cli -l

TLS_RANDFILE <filename>

Specifies the file to obtain random bits from when /dev/[u]random is not available. Generally set to the name of the EGD/PRNGD socket. The environment variable RANDFILE can also be used to specify the filename. This parameter is ignored with GNUtls.

TLS_REQCERT <level>

Specifies what checks to perform on server certificates in a TLS session, if any. The <level> can be specified as one of the following keywords:

never

The client will not request or check any server certificate.

allow

The server certificate is requested. If no certificate is provided, the session proceeds normally. If a bad certificate is provided, it will be ignored and the session proceeds normally.

try

The server certificate is requested. If no certificate is provided, the session proceeds normally. If a bad certificate is provided, the session is immediately terminated.

demand | hard

These keywords are equivalent. The server certificate is requested. If no certificate is provided, or a bad certificate is provided, the session is immediately terminated. This is the default setting.

TLS_CRLCHECK <level>

Specifies if the Certificate Revocation List (CRL) of the CA should be used to verify if the server certificates have not been revoked. This requires TLS_CACERTDIR parameter to be set. This parameter is ignored with GNUtls. <level> can be specified as one of the following keywords:

none

No CRL checks are performed

peer

Check the CRL of the peer certificate

all

Check the CRL for a whole certificate chain

TLS_CRLFILE <filename>

Specifies the file containing a Certificate Revocation List to be used to verify if the server certificates have not been revoked. This parameter is only supported with GNUtls.

ENVIRONMENT VARIABLES

LDAPNOINIT

disable all defaulting

LDAPCONF

path of a configuration file

LDAPRC

basename of ldaprc file in $HOME or $CWD

LDAP<option-name>

Set <option-name> as from ldap.conf

FILES

/etc/openldap/ldap.conf

system-wide ldap configuration file

$HOME/ldaprc, $HOME/.ldaprc

user ldap configuration file

$CWD/ldaprc

local ldap configuration file

SEE ALSO

AUTHOR

ACKNOWLEDGEMENTS