Provided by: libldap2-dev_2.4.28-1.1ubuntu4_amd64 bug

NAME

       ldap_bind,     ldap_bind_s,    ldap_simple_bind,    ldap_simple_bind_s,    ldap_sasl_bind,
       ldap_sasl_bind_s, ldap_sasl_interactive_bind_s, ldap_parse_sasl_bind_result,  ldap_unbind,
       ldap_unbind_s,   ldap_unbind_ext,  ldap_unbind_ext_s,  ldap_set_rebind_proc  -  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_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);

       int ldap_sasl_interactive_bind(LDAP *ld, const char *dn,
              const char *mechs,
              LDAPControl *sctrls[], LDAPControl *cctrls[],
              unsigned flags, LDAP_SASL_INTERACT_PROC *interact,
              void *defaults, LDAPMessage *result,
              const char **rmechp, int *msgidp);

       int (LDAP_SASL_INTERACT_PROC)(LDAP *ld, unsigned flags, void *defaults, void *sasl_interact);

       int ldap_unbind(LDAP *ld);

       int ldap_unbind_s(LDAP *ld);

       int ldap_unbind_ext(LDAP *ld, LDAPControl *sctrls[],
              LDAPControl *cctrls[]);

       int ldap_unbind_ext_s(LDAP *ld, LDAPControl *sctrls[],
              LDAPControl *cctrls[]);

       int ldap_set_rebind_proc (LDAP *ld, LDAP_REBIND_PROC *ldap_proc, void *params);

       int (LDAP_REBIND_PROC)(LDAP *ld, LDAP_CONST char *url, ber_tag_t request, ber_int_t msgid, void *params);

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 three types of bind calls, ones providing simple authentication, ones  providing
       SASL  authentication,  and  general  routines  capable  of  doing  either  simple  or SASL
       authentication.

       SASL (Simple Authentication and Security Layer) 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).

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).

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 LDAP_AUTH_SIMPLE to  select  simple
       authentication.   ldap_bind()  returns  the  message  id  of  the  request  it  initiates.
       ldap_bind_s() returns an LDAP error indication.

SASL AUTHENTICATION

       For SASL binds the server always ignores any provided  DN,  so  the  dn  parameter  should
       always  be  NULL.  ldap_sasl_bind_s() sends a single SASL bind request with the given SASL
       mechanism and credentials in the cred parameter. The format of the credentials depends  on
       the  particular  SASL  mechanism in use. For mechanisms that provide mutual authentication
       the server's credentials will be returned  in  the  servercredp  parameter.   The  routine
       returns  an  LDAP  error  indication  (see  ldap_error(3)).   The ldap_sasl_bind() call is
       asynchronous, taking the same parameters but only sending the request  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).   The  result  must  be   additionally   parsed   by
       ldap_parse_sasl_bind_result() to obtain any server credentials sent from the server.

       Many   SASL   mechanisms   require  multiple  message  exchanges  to  perform  a  complete
       authentication. Applications should generally  use  ldap_sasl_interactive_bind_s()  rather
       than  calling  the  basic  ldap_sasl_bind() functions directly. The mechs parameter should
       contain a space-separated list of candidate mechanisms to use. If this parameter  is  NULL
       or  empty  the  library will query the supportedSASLMechanisms attribute from the server's
       rootDSE for the list of SASL mechanisms the server supports. The flags parameter  controls
       the  interaction  used to retrieve any necessary SASL authentication parameters and should
       be one of:

       LDAP_SASL_AUTOMATIC
              use defaults if available, prompt otherwise

       LDAP_SASL_INTERACTIVE
              always prompt

       LDAP_SASL_QUIET
              never prompt

       The interact function uses the provided defaults to handle requests from the SASL  library
       for  particular  authentication  parameters.  There  is no defined format for the defaults
       information; it is up to the caller to use whatever format is appropriate for the supplied
       interact  function.   The  sasl_interact parameter comes from the underlying SASL library.
       When used with Cyrus SASL this is an array of sasl_interact_t structures. The  Cyrus  SASL
       library will prompt for a variety of inputs, including:

       SASL_CB_GETREALM
              the realm for the authentication attempt

       SASL_CB_AUTHNAME
              the username to authenticate

       SASL_CB_PASS
              the password for the provided username

       SASL_CB_USER
              the username to use for proxy authorization

       SASL_CB_NOECHOPROMPT
              generic prompt for input with input echoing disabled

       SASL_CB_ECHOPROMPT
              generic prompt for input with input echoing enabled

       SASL_CB_LIST_END
              indicates the end of the array of prompts

       See the Cyrus SASL documentation for more details.

       Applications    which    need    to    manage    connections    asynchronously   may   use
       ldap_sasl_interactive_bind() instead of the synchronous version.  A valid mechs  parameter
       must  be  supplied, otherwise the library will be forced to query the server for a list of
       supported  mechanisms,  and  this  query  will  be  performed  synchronously.   The  other
       parameters are the same as for the synchronous function, with three additional parameters.
       The actual SASL mechanism that was used, and the message ID  for  use  with  ldap_result()
       will  be  returned  in  rmechp  and msgidp, respectively.  The value in rmechp must not be
       modified by the caller and must be passed  back  on  each  subsequent  call.  The  message
       obtained  from  ldap_result() must be passed in the result parameter.  This parameter must
       be NULL when initiating a new Bind. The caller must free the  result  message  after  each
       call  using  ldap_msgfree().   The  ldap_sasl_interactive_bind()  function returns an LDAP
       result code. If the code is LDAP_SASL_BIND_IN_PROGRESS then the Bind is not complete  yet,
       and this function must be called again with the next result from the server.

REBINDING

       The  ldap_set_rebind_proc function() sets the process to use for binding when an operation
       returns a referral. This function is used when an application needs  to  bind  to  another
       server in order to follow a referral or search continuation reference.

       The  function takes ld, the rebind function, and the params, the arbitrary data like state
       information which the client might need to properly rebind.  The LDAP_OPT_REFERRALS option
       in  the  ld  must  be  set  to  ON  for  the libraries to use the rebind function. Use the
       ldap_set_option function to set the value.

       The rebind function parameters are as follows:

       The ld parameter must be used by the application when binding to the  referred  server  if
       the application wants the libraries to follow the referral.

       The  url  parameter  points to the URL referral string received from the LDAP server.  The
       LDAP application can use the ldap_url_parse(3) function  to  parse  the  string  into  its
       components.

       The request parameter specifies the type of request that generated the referral.

       The msgid parameter specifies the message ID of the request generating the referral.

       The  params parameter is the same value as passed originally to the ldap_set_rebind_proc()
       function.

       The LDAP libraries set all  the  parameters  when  they  call  the  rebind  function.  The
       application  should  not attempt to free either the ld or the url structures in the rebind
       function.

       The application must supply to the rebind function the required authentication information
       such as, user name, password, and certificates. The rebind function must use a synchronous
       bind method.

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.

       The ldap_unbind_ext() and ldap_unbind_ext_s() allows the operations to specify  controls.

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.

NOTES

       If an anonymous bind is sufficient for the application, the rebind  process  need  not  be
       provided.  The LDAP libraries with the LDAP_OPT_REFERRALS option set to ON (default value)
       will automatically follow referrals using an anonymous bind.

       If the application needs stronger authentication than  an  anonymous  bind,  you  need  to
       provide  a  rebind  process  for  that  authentication  method.   The  bind method must be
       synchronous.

SEE ALSO

       ldap(3),  ldap_error(3),  ldap_open(3),  ldap_set_option(3),  ldap_url_parse(3)  RFC  4422
       (http://www.rfc-editor.org), Cyrus SASL (http://asg.web.cmu.edu/sasl/)

ACKNOWLEDGEMENTS

       OpenLDAP    Software    is    developed   and   maintained   by   The   OpenLDAP   Project
       <http://www.openldap.org/>.  OpenLDAP Software is derived from University of Michigan LDAP
       3.3 Release.