LDAP_BIND(3) OpenLDAP 2.2.23 (2005/01/24) LDAP_BIND(3)
NAME
ldap_bind, ldap_bind_s, ldap_simple_bind,
ldap_simple_bind_s, ldap_kerberos_bind_s,
ldap_kerberos_bind1, ldap_kerberos_bind1_s,
ldap_kerberos_bind2, ldap_kerberos_bind2_s, ldap_sasl_bind,
ldap_sasl_bind_s, ldap_sasl_interactive_bind_s,
ldap_parse_sasl_bind_result, ldap_unbind, ldap_unbind_s-
LDAP bind routines
LIBRARY
OpenLDAP LDAP (libldap, -lldap)
SYNOPSIS
#include <ldap.h>
int ldap_bind(LDAP *ld, const char *who, const char *cred
int method);
int ldap_bind_s(LDAP *ld, const char *who, const char *cred
int method);
int ldap_simple_bind(LDAP *ld, const char *who, const char *passwd
int ldap_simple_bind_s(LDAP *ld, const char *who, const char *passwd
int ldap_kerberos_bind_s(LDAP *ld, const char *who);
int ldap_kerberos_bind1(LDAP *ld, const char *who);
int ldap_kerberos_bind1_s(LDAP *ld, const char *who);
int ldap_kerberos_bind2(LDAP *ld, const char *who);
int ldap_kerberos_bind2_s(LDAP *ld, const char *who);
int ldap_sasl_bind(LDAP *ld, const char *dn, const char *mechanism
struct berval *cred, LDAPControl *sctrls[],
LDAPControl *cctrls[], int *msgidp);
int ldap_sasl_bind_s(LDAP *ld, const char *dn, const char *mechanism
struct berval *cred, LDAPControl *sctrls[],
LDAPControl *cctrls[], struct berval **servercredp);
int ldap_parse_sasl_bind_result(LDAP *ld, LDAPMessage *res,
struct berval **servercredp, int freeit);
int ldap_sasl_interactive_bind_s(LDAP *ld, const char *dn,
const char *mechs,
LDAPControl *sctrls[], LDAPControl *cctrls[],
unsigned flags, LDAP_SASL_INTERACT_PROC *interact,
void *defaults);
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int ldap_unbind(LDAP *ld);
int ldap_unbind_s(LDAP *ld);
DESCRIPTION
These routines provide various interfaces to the LDAP bind
operation. After an association with an LDAP server is made
using ldap_init(3), an LDAP bind operation should be
performed before other operations are attempted over the
connection. An LDAP bind is required when using Version 2
of the LDAP protocol; it is optional for Version 3 but is
usually needed due to security considerations.
There are many types of bind calls, providing simple
authentication, Kerberos version 4 authentication, and
general routines to do either one, as well as calls using
SASL (Simple Authentication and Security Layer) that can
negotiate one of many different kinds of authentication.
Both synchronous and asynchronous versions of each variant
of the bind call are provided. All routines take ld as
their first parameter, as returned from ldap_init(3).
Kerberos version 4 has been superseded by Kerberos version
5, and the Kerberos version 4 support is only provided for
backward compatibility. The SASL interfaces should be used
for new applications. SASL provides a general interface for
using Kerberos versions 4 and 5 and many other security
systems.
SIMPLE AUTHENTICATION
The simplest form of the bind call is ldap_simple_bind_s().
It takes the DN to bind as in who, and the userPassword
associated with the entry in passwd. It returns an LDAP
error indication (see ldap_error(3)). The
ldap_simple_bind() call is asynchronous, taking the same
parameters but only initiating the bind operation and
returning the message id of the request it sent. The result
of the operation can be obtained by a subsequent call to
ldap_result(3).
KERBEROS AUTHENTICATION
If the LDAP library and LDAP server being contacted have
been compiled with the KERBEROS option defined, Kerberos
version 4 authentication can be performed. As mentioned
above, these Kerberos routines are provided only for
backward compatibility.
These routines assume the user already has obtained a ticket
granting ticket. The routines take who, the DN of the entry
to bind as. The ldap_kerberos_bind_s() routine does both
steps of the Kerberos binding process synchronously. The
ldap_kerberos_bind1_s() and ldap_kerberos_bind2_s() routines
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allow synchronous access to the individual steps,
authenticating to the LDAP server and X.500 DSA,
respectively. The ldap_kerberos_bind1() and
ldap_kerberos_bind2() routines provide equivalent
asynchronous access.
The ldap_kerberos_bind_s() routine is used to perform both
authentication steps when contacting an LDAP server that is
a gateway to an X.500 DSA. This kind of server
configuration is only supported in the (very old) University
of Michigan LDAP release. The OpenLDAP package no longer
provides this gateway server. The standalone LDAP server
provided in OpenLDAP may still be configured with Kerberos
version 4 support, but it only requires one authentication
step, and will return an error if the second step is
attempted. Therefore, only the ldap_kerberos_bind1()
routine or its synchronous equivalent may be used when
contacting an OpenLDAP server.
GENERAL AUTHENTICATION
The ldap_bind() and ldap_bind_s() routines can be used when
the authentication method to use needs to be selected at
runtime. They both take an extra method parameter selecting
the authentication method to use. It should be set to one
of LDAP_AUTH_SIMPLE, LDAP_AUTH_KRBV41, or LDAP_AUTH_KRBV42,
to select simple authentication, Kerberos authentication to
the LDAP server, or Kerberos authentication to the X.500
DSA, respectively. ldap_bind() returns the message id of
the request it initiates. ldap_bind_s() returns an LDAP
error indication.
SASL AUTHENTICATION
Description still under construction...
UNBINDING
The ldap_unbind() call is used to unbind from the directory,
terminate the current association, and free the resources
contained in the ld structure. Once it is called, the
connection to the LDAP server is closed, and the ld
structure is invalid. The ldap_unbind_s() call is just
another name for ldap_unbind(); both of these calls are
synchronous in nature.
ERRORS
Asynchronous routines will return -1 in case of error,
setting the ld_errno parameter of the ld structure.
Synchronous routines return whatever ld_errno is set to.
See ldap_error(3) for more information.
SEE ALSO
ldap(3), ldap_error(3), ldap_open(3), RFC 2222
(http://www.ietf.org), Cyrus SASL
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LDAP_BIND(3) OpenLDAP 2.2.23 (2005/01/24) LDAP_BIND(3)
(http://asg.web.cmu.edu/sasl/)
ACKNOWLEDGEMENTS
OpenLDAP is developed and maintained by The OpenLDAP Project
(http://www.openldap.org/). OpenLDAP is derived from
University of Michigan LDAP 3.3 Release.
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