Grr... both files turned out to be authtest.c, here's the real authldap.c

On Sat, 18 Jan 2003, Aaron Stone wrote:

> Here we are with the fifth installment of the LDAP authentication module.
> Everything is now implemented except for the change_password routine
> because that needs a lot more work.
>
> This version also has no apparent memory leaks, checked with the excellent
> ccmalloc tool, http://www.inf.ethz.ch/personal/biere/projects/ccmalloc/
>
> At this point, I'd like to ask the IC&S folks to include authldap.c with
> the dbmail distribution. Please let me know the status of getting into the
> next release, either a point release or a minor version bump.
>
> As for my discussion of the aliases table, for now I'm not worrying about
> it. The auth_check_user routine actually take an email address as
> an argument (desprite the function and the variable both calling it a
> 'username'... and so that works to find the user by their 'aliases' in the
> ldap (the FIELD_MAIL and FIELD_MAILALT, equally). Additionally, the
> aliases are only tied to a specific user if the deliver_to field is
> numeric. If it is not, then the alias is pointing to an outside address or
> to a program. I'm not sure if these should go into the directory, or stay
> in the database... if anybody cares, we should start a thread on my
> previous mailings and figure out a good way to handle this!
>
> Here's the necessary config file section, just drop it into
> /etc/dbmail.conf and customize as needed (this one works with the
> qmail-ldap patch, at http://nrg4u.com):
>
> [LDAP]
> BASE_DN=ou=Users,dc=Acme,dc=Com
> BIND_DN=cn=Manager,dc=Acme,dc=Com
> BIND_PW=secret
> SCOPE=SubTree
> PORT=389
> HOSTNAME=localhost
> OBJECTCLASS=qmailuser
> FIELD_UID=uid
> FIELD_CID=qmailgid
> FIELD_NID=qmailuid
> FIELD_MAIL=mail
> FIELD_MAILALT=mailalternateaddress
> FIELD_QUOTA=mailquota
>
>
> Aaron
>
/*
 * $Id: authldap.c $
 * (c) 2002 Aaron Stone, [EMAIL PROTECTED]
 * User authentication functions for LDAP.
 */

#include "auth.h"
#include <ldap.h>
#include "list.h"
#include "debug.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "db.h"
#include "dbmd5.h"
#include <crypt.h>
#include "config.h"
#include <time.h>

#define AUTH_QUERY_SIZE 1024

extern char *configFile;

LDAP *_ldap_conn;
LDAPMod **_ldap_mod;
LDAPMessage *_ldap_res;
LDAPMessage *_ldap_msg;
int _ldap_err;
int _ldap_attrsonly = 0;
char *_ldap_dn;
char **_ldap_vals;
char **_ldap_attrs = NULL;
char _ldap_query[AUTH_QUERY_SIZE]; 
field_t _cfg_ldap_bind_dn,
        _cfg_ldap_bind_pw,
        _cfg_ldap_base_dn,
        _cfg_ldap_port,
        _cfg_ldap_scope,
        _cfg_ldap_hostname,
        _cfg_ldap_objectclass,
        _cfg_ldap_field_uid,
        _cfg_ldap_field_cid,
        _cfg_ldap_field_nid,
        _cfg_ldap_field_mail,
        _cfg_ldap_field_mailalt,
        _cfg_ldap_field_maxmail;
int _cfg_ldap_scope_int;


static void _get_ldap_config()
{
  struct list ldapItems;

  ReadConfig("LDAP", configFile, &ldapItems);
  SetTraceLevel(&ldapItems);

  GetConfigValue("BIND_DN", &ldapItems, _cfg_ldap_bind_dn);
  if (strlen(_cfg_ldap_bind_dn) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for BIND_DN in config 
file");
  trace(TRACE_DEBUG, "_get_ldap_config(): bind dn [%s]", _cfg_ldap_bind_dn);

  GetConfigValue("BIND_PW", &ldapItems, _cfg_ldap_bind_pw);
  if (strlen(_cfg_ldap_bind_pw) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for BIND_PW in config 
file");
  trace(TRACE_DEBUG, "_get_ldap_config(): bind pw [%s]", _cfg_ldap_bind_pw);

  GetConfigValue("BASE_DN", &ldapItems, _cfg_ldap_base_dn);
  if (strlen(_cfg_ldap_base_dn) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for BASE_DN in config 
file");
  trace(TRACE_DEBUG, "_get_ldap_config(): base dn [%s]", _cfg_ldap_base_dn);

  GetConfigValue("PORT", &ldapItems, _cfg_ldap_port);
  if (strlen(_cfg_ldap_port) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for PORT in config 
file");
  trace(TRACE_DEBUG, "_get_ldap_config(): port [%s]", _cfg_ldap_port);

  GetConfigValue("HOSTNAME", &ldapItems, _cfg_ldap_hostname);
  if (strlen(_cfg_ldap_hostname) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for HOSTNAME in config 
file");
  trace(TRACE_DEBUG, "_get_ldap_config(): hostname [%s]", _cfg_ldap_hostname);

  GetConfigValue("OBJECTCLASS", &ldapItems, _cfg_ldap_objectclass);
  if (strlen(_cfg_ldap_objectclass) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for OBJECTCLASS in 
config file");
  trace(TRACE_DEBUG, "_get_ldap_config(): objectclass [%s]", 
_cfg_ldap_objectclass);

  GetConfigValue("FIELD_UID", &ldapItems, _cfg_ldap_field_uid);
  if (strlen(_cfg_ldap_field_uid) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for FIELD_UID in 
config file");
  trace(TRACE_DEBUG, "_get_ldap_config(): uid field [%s] ", 
_cfg_ldap_field_uid);

  GetConfigValue("FIELD_CID", &ldapItems, _cfg_ldap_field_cid);
  if (strlen(_cfg_ldap_field_cid) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for FIELD_CID in 
config file");
  trace(TRACE_DEBUG, "_get_ldap_config(): cid field [%s]", _cfg_ldap_field_cid);

  GetConfigValue("FIELD_NID", &ldapItems, _cfg_ldap_field_nid);
  if (strlen(_cfg_ldap_field_nid) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for FIELD_NID in 
config file");
  trace(TRACE_DEBUG, "_get_ldap_config(): nid field [%s]", _cfg_ldap_field_nid);

  GetConfigValue("FIELD_MAIL", &ldapItems, _cfg_ldap_field_mail);
  if (strlen(_cfg_ldap_field_mail) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for FIELD_MAIL in 
config file");
  trace(TRACE_DEBUG, "_get_ldap_config(): mail field [%s]", 
_cfg_ldap_field_mail);

  GetConfigValue("FIELD_MAILALT", &ldapItems, _cfg_ldap_field_mailalt);
  if (strlen(_cfg_ldap_field_mailalt) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for FIELD_MAILALT in 
config file");
  trace(TRACE_DEBUG, "_get_ldap_config(): mail alt field [%s]", 
_cfg_ldap_field_mailalt);

  GetConfigValue("FIELD_QUOTA", &ldapItems, _cfg_ldap_field_maxmail);
  if (strlen(_cfg_ldap_field_maxmail) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for FIELD_QUOTA in 
config file");
  trace(TRACE_DEBUG, "_get_ldap_config(): quota field [%s]", 
_cfg_ldap_field_maxmail);

  GetConfigValue("SCOPE", &ldapItems, _cfg_ldap_scope);
  if (strlen(_cfg_ldap_scope) == 0)
        trace(TRACE_DEBUG, "_get_ldap_config(): no value for SCOPE in config 
file");
  trace(TRACE_DEBUG, "_get_ldap_config(): raw ldap scope is [%s]", 
_cfg_ldap_scope);

  /* Compare the input string with the possible options,
   * making sure not to exceeed the length of the given string */
  if( strncasecmp( _cfg_ldap_scope, "one", ( strlen( _cfg_ldap_scope ) < 3 ? 
strlen( _cfg_ldap_scope ) : 3 ) ) == 0 )
          _cfg_ldap_scope_int = LDAP_SCOPE_ONELEVEL;
  else if( strncasecmp( _cfg_ldap_scope, "bas", ( strlen( _cfg_ldap_scope ) < 3 
? strlen( _cfg_ldap_scope ) : 3 ) ) == 0 )
          _cfg_ldap_scope_int = LDAP_SCOPE_BASE;
  else if( strncasecmp( _cfg_ldap_scope, "sub", ( strlen( _cfg_ldap_scope ) < 3 
? strlen( _cfg_ldap_scope ) : 3 ) ) == 0 )
          _cfg_ldap_scope_int = LDAP_SCOPE_SUBTREE;
  else
          _cfg_ldap_scope_int = LDAP_SCOPE_SUBTREE;

  trace(TRACE_DEBUG, "_get_ldap_config(): integer ldap scope is [%d]", 
_cfg_ldap_scope_int);

  list_freelist( &ldapItems.start );

}


/*
 * auth_connect()
 *
 * initializes the connection for authentication.
 * 
 * returns 0 on success, -1 on failure
 */
int auth_connect()
{
  _get_ldap_config();

  trace(TRACE_DEBUG, "auth_connect(): connecting to ldap server on [%s] : 
[%s]", _cfg_ldap_hostname, _cfg_ldap_port );
  _ldap_conn = ldap_init( _cfg_ldap_hostname, atoi( _cfg_ldap_port ) );
  trace(TRACE_DEBUG, "auth_connect(): binding to ldap server as [%s] / [%s]", 
_cfg_ldap_bind_dn, _cfg_ldap_bind_pw );
  _ldap_err = ldap_bind_s( _ldap_conn, _cfg_ldap_bind_dn, _cfg_ldap_bind_pw, 
LDAP_AUTH_SIMPLE );
  if( _ldap_err )
    {
      trace(TRACE_ERROR,"auth_connect(): ldap_bind_s failed: %s",
            ldap_err2string( _ldap_err ) );
      return -1;
    }

  trace(TRACE_DEBUG, "auth_connect(): successfully bound to ldap server");
  return 0;
}


int auth_disconnect()
{
  ldap_unbind( _ldap_conn );
  return 0;
}


u64_t auth_user_exists(const char *username)
{
  u64_t id;

  if (!username)
    {
      trace(TRACE_ERROR,"auth_user_exists(): got NULL as username");
      return 0;
    }

  snprintf( _ldap_query, AUTH_QUERY_SIZE, "(%s=%s)", _cfg_ldap_field_uid, 
username );
  trace(TRACE_DEBUG, "auth_user_exists(): searching with query [%s]", 
_ldap_query );
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_user_exists(): could not execute query: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

  if ( ldap_count_entries( _ldap_conn, _ldap_res ) < 1 ) 
    {
      trace (TRACE_DEBUG,"auth_user_exists(): none found");
      ldap_msgfree( _ldap_res );
      return 0; 
    } 

  _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
  if ( _ldap_msg == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_user_exists(): ldap_first_entry failed: %s", 
ldap_err2string( _ldap_err ) );
      ldap_msgfree( _ldap_res );
      return -1;
    }

  _ldap_vals = ldap_get_values( _ldap_conn, _ldap_msg, _cfg_ldap_field_nid );

  id = ( _ldap_vals[0] ) ? strtoull( _ldap_vals[0], NULL, 0 ) : 0;
  trace(TRACE_DEBUG, "auth_user_exists(): returned value is [%s]", 
_ldap_vals[0] );

  ldap_msgfree( _ldap_res );
  ldap_value_free( _ldap_vals );

  return id;
}


/* return a list of existing users. -2 on mem error, -1 on db-error, 0 on 
succes */
int auth_get_known_users(struct list *users)
{
  int i, j;

  if (!users)
    {
      trace(TRACE_ERROR,"auth_get_known_users(): got a NULL pointer as 
argument");
      return -2;
    }

  list_init(users);

  snprintf( _ldap_query, AUTH_QUERY_SIZE, "(objectClass=%s)", 
_cfg_ldap_objectclass );
  trace(TRACE_DEBUG,"auth_get_known_users(): searching with query 
[%s]",_ldap_query);
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace( TRACE_ERROR, "auth_get_known_users(): could not retrieve user 
list: %s", ldap_err2string( _ldap_err ) );
      return -1;
    }

  /* find out how many results for our query */
  j = ldap_count_entries( _ldap_conn, _ldap_res );

  if( j > 0 )
    {
      /* for the first result we use ldap_first_entry */
      _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
      if ( _ldap_msg == NULL) 
        {
          ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
          trace(TRACE_ERROR,"auth_get_known_users(): ldap_first_entry failed: 
%s", ldap_err2string( _ldap_err ) );
          return -1;
        }

      /* for subsequent results we use ldap_next_entry at the end of the loop */
      for ( i = 0; i < j; i++ )
        {
          /* the LDAPMessage structure has entries for "res" and "msg" so we 
use just one of them here */
          _ldap_dn = ldap_get_dn( _ldap_conn, _ldap_msg );
          if ( _ldap_dn == NULL )
            {
              ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
              trace(TRACE_ERROR,"auth_get_known_users(): ldap_get_dn failed: 
%s", ldap_err2string( _ldap_err ) );
              return -1;
            }
          trace(TRACE_DEBUG,"auth_get_known_users(): found something at [%s]", 
_ldap_dn );
          ldap_memfree( _ldap_dn );

          _ldap_vals = ldap_get_values( _ldap_conn, _ldap_msg, 
_cfg_ldap_field_uid );
          if ( _ldap_vals == NULL )
            {
              ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
              trace(TRACE_ERROR,"auth_get_known_users(): ldap_get_values failed 
for [%s]: %s", _cfg_ldap_field_uid, ldap_err2string( _ldap_err ) );
              return -1;
            }

          if ( !list_nodeadd( users, _ldap_vals[0], strlen( _ldap_vals[0] ) + 1 
) )
            {
              list_freelist( &users->start );
              return -2;
            }
          /* gotta free each result as we're done using it */
          ldap_value_free( _ldap_vals );

          /* if we're not yet at the last entry, then pull up the next one */
          if( i + 1 < j )
            {
              _ldap_msg = ldap_next_entry( _ldap_conn, _ldap_msg );
              if ( _ldap_msg == NULL) 
                {
                  ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, 
&_ldap_err);
                  trace(TRACE_ERROR,"auth_get_known_users(): ldap_next_entry 
failed: %s", ldap_err2string( _ldap_err ) );
                  return -1;
                }
            }
        }
    }
  else
    {
      trace(TRACE_ERROR,"auth_get_known_users(): no users found" );
    }

  /* we already freed that values as we used them in the for loop, just do the 
result set now */
  ldap_msgfree( _ldap_res );
  return 0;
}


/*
 * Get the Client ID number
 * Return 0 on successful failure
 * Return -1 on really big failures
 */
u64_t auth_getclientid(u64_t useridnr)
{
  u64_t cid;

  if (!useridnr)
    {
      trace(TRACE_ERROR,"auth_getclientid(): got NULL as useridnr");
      return 0;
    }

  snprintf( _ldap_query, AUTH_QUERY_SIZE, "(%s=%llu)", _cfg_ldap_field_nid, 
useridnr );
  trace (TRACE_DEBUG,"auth_getclientid(): searching with query 
[%s]",_ldap_query);
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_getclientid(): could not execute query: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

  if ( ldap_count_entries( _ldap_conn, _ldap_res ) < 1 ) 
    {
      trace (TRACE_DEBUG,"auth_getclientid(): no entries found");
      return 0; 
    } 

  _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
  if ( _ldap_msg == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_getclientid(): ldap_first_entry failed: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

          _ldap_dn = ldap_get_dn( _ldap_conn, _ldap_msg );
          if ( _ldap_dn == NULL )
            {
              ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
              trace(TRACE_ERROR,"auth_getclientid(): ldap_get_dn failed: %s", 
ldap_err2string( _ldap_err ) );
              return -1;
            }
          trace(TRACE_DEBUG,"auth_getclientid(): found something at [%s]", 
_ldap_dn );
          ldap_memfree( _ldap_dn );

  _ldap_vals = ldap_get_values( _ldap_conn, _ldap_msg, _cfg_ldap_field_cid );
  if( _ldap_vals == NULL )
    {
      trace (TRACE_DEBUG,"auth_getclientid(): no values found");
      cid = 0; 
    } 
  else
    {
      cid = ( _ldap_vals[0] ) ? strtoull( _ldap_vals[0], NULL, 0 ) : 0;
    }

  ldap_msgfree( _ldap_res );
  ldap_value_free( _ldap_vals );

  return cid;
}


u64_t auth_getmaxmailsize(u64_t useridnr)
{
  u64_t maxmailsize;

  if (!useridnr)
    {
      trace(TRACE_ERROR,"auth_getmaxmailsize(): got NULL as useridnr");
      return 0;
    }

  snprintf( _ldap_query, AUTH_QUERY_SIZE, "(%s=%llu)", _cfg_ldap_field_nid, 
useridnr );
  trace (TRACE_DEBUG,"auth_getmaxmailsize(): searching with query 
[%s]",_ldap_query);
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_getmaxmailsize(): could not execute query: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

  if ( ldap_count_entries( _ldap_conn, _ldap_res ) < 1 ) 
    {
      trace (TRACE_DEBUG,"auth_getmaxmailsize(): no entries found");
      return 0; 
    } 

  _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
  if ( _ldap_msg == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_getmaxmailsize(): ldap_first_entry failed: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

          _ldap_dn = ldap_get_dn( _ldap_conn, _ldap_msg );
          if ( _ldap_dn == NULL )
            {
              ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
              trace(TRACE_ERROR,"auth_getmaxmailsize(): ldap_get_dn failed: 
%s", ldap_err2string( _ldap_err ) );
              return -1;
            }
          trace(TRACE_DEBUG,"auth_getmaxmailsize(): found something at [%s]", 
_ldap_dn );
          ldap_memfree( _ldap_dn );

  _ldap_vals = ldap_get_values( _ldap_conn, _ldap_msg, _cfg_ldap_field_maxmail 
);
  if( _ldap_vals == NULL )
    {
      trace (TRACE_DEBUG,"auth_getmaxmailsize(): no values found");
      maxmailsize = 0; 
    } 
  else
    {
      maxmailsize = ( _ldap_vals[0] ) ? strtoull( _ldap_vals[0], 0, 10 ) : -1;
    }

  ldap_msgfree( _ldap_res );
  ldap_value_free( _ldap_vals );

  return maxmailsize;
}


/*
 * auth_getencryption()
 *
 * returns a string describing the encryption used for the passwd storage
 * for this user.
 * The string is valid until the next function call; in absence of any 
 * encryption the string will be empty (not null).
 *
 * If the specified user does not exist an empty string will be returned.
 */
char *auth_getencryption(u64_t useridnr)
{
  /* ldap does not support fancy passwords */
  return 0;
}


/* recursive function, should be called with checks == -1 from main routine */
int auth_check_user (const char *address, struct list *userids, int checks) 
{
  int occurences=0, r;
  int i, j;
  
  trace(TRACE_DEBUG,"auth_check_user(): checking for user [%s]",address);

  if (checks > MAX_CHECKS_DEPTH)
    {
      trace(TRACE_ERROR, "auth_check_user(): maximum checking depth reached, 
there probably is a loop in your alias table");
      return -1;
    }
  
  snprintf ( _ldap_query, AUTH_QUERY_SIZE, "(|(%s=%s)(%s=%s))", 
_cfg_ldap_field_mail, address, _cfg_ldap_field_mailalt, address );
  trace(TRACE_DEBUG,"auth_check_user(): searching with query [%s]",_ldap_query);
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_check_user(): could not execute query [%s]", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

  /* we're just using a little counter variable, since we'll use it in the for 
loop later */
  j = ldap_count_entries( _ldap_conn, _ldap_res );

  if ( j < 1 ) 
  {
    if ( checks > 0 )
      {
        /* found the last one, this is the deliver to
         * but checks needs to be bigger then 0 because
         * else it could be the first query failure */

        list_nodeadd( userids, address, strlen( address ) + 1 );
        trace (TRACE_DEBUG,"auth_check_user(): adding [%s] to deliver_to 
address",address);
        return 1;
      }
    else
      {
        trace (TRACE_DEBUG,"auth_check_user(): user [%s] not in aliases 
table",address);
        return 0; 
      }
  }
      
  trace (TRACE_DEBUG,"auth_check_user(): into checking loop");

  if ( ldap_count_entries( _ldap_conn, _ldap_res ) < 1 ) 
    {
      trace (TRACE_DEBUG,"auth_check_user(): none found");
      return 0; 
    } 

  /* do the first entry here */
  _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
  if ( _ldap_msg == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_check_user(): ldap_first_entry failed: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

  /* we'll get the next entry at the _end_ of the loop! */
  for ( i = 0; i < j; i++ )
  {
    _ldap_vals = ldap_get_values( _ldap_conn, _ldap_msg, _cfg_ldap_field_cid ); 
// FIXME: what field is this?

    /* do a recursive search for deliver_to */
    trace (TRACE_DEBUG,"auth_check_user(): checking user [%s] to [%s]",address, 
_ldap_vals[0]);

    r = auth_check_user (_ldap_vals[0], userids, (checks < 0) ? 1 : checks+1);
    /* remember, this is freed as soon as it's no longer needed */
    ldap_value_free( _ldap_vals );

    if (r < 0)
      {
        /* loop detected */

        if (checks > 0)
          return -1; /* still in recursive call */

        if (userids->start)
          {
            list_freelist(&userids->start);
            userids->total_nodes = 0;
          }

        return 0; /* report to calling routine: no results */
      }

    occurences += r;

  /* do the next entry here */
  _ldap_msg = ldap_next_entry( _ldap_conn, _ldap_msg );
  if ( _ldap_msg == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_check_user(): ldap_next_entry failed: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

  }
  
  trace(TRACE_DEBUG,"auth_check_user(): executing query, checks [%d]", checks);
  /* trace(TRACE_INFO,"auth_check_user(): user [%s] has [%d] 
entries",address,occurences); */

  ldap_msgfree( _ldap_res );

  return occurences;
}

        

/*
 * auth_check_user_ext()
 * 
 * As auth_check_user() but adds the numeric ID of the user found
 * to userids or the forward to the fwds.
 * 
 * returns the number of occurences. 
 */
int auth_check_user_ext(const char *address, struct list *userids, struct list 
*fwds, int checks) 
{
  int i, j;
  int occurences=0;
  u64_t id;
  char *endptr = NULL;

  trace(TRACE_DEBUG,"auth_check_user_ext(): checking user [%s] in alias 
table",address);
  
  snprintf( _ldap_query, AUTH_QUERY_SIZE, "(|(%s=%s)(%s=%s)", 
_cfg_ldap_field_mail, address, _cfg_ldap_field_mailalt, address );

  trace(TRACE_DEBUG,"auth_check_user_ext(): searching with query 
[%s]",_ldap_query);
  trace(TRACE_DEBUG,"auth_check_user_ext(): executing query, checks [%d]", 
checks);
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_check_user_ext(): could not execute query: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

  /* we're just using a little counter variable, since we'll use it in the for 
loop later */
  j = ldap_count_entries( _ldap_conn, _ldap_res );

  if ( i < 1 ) 
  {
    if (checks>0)
      {
        /* found the last one, this is the deliver to
         * but checks needs to be bigger then 0 because
         * else it could be the first query failure */

        id = strtoull(address, &endptr, 10);
        if (*endptr == 0)
          list_nodeadd(userids, &id, sizeof(id)); /* numeric deliver-to --> 
this is a userid */
        else
          list_nodeadd(fwds, address, strlen(address)+1);

        trace (TRACE_DEBUG,"auth_check_user_ext(): adding [%s] to deliver_to 
address", address);
        return 1;
      }
    else
      {
        trace (TRACE_DEBUG,"auth_check_user_ext(): user [%s] not in aliases 
table", address);
        return 0; 
      }
  }
      
  trace (TRACE_DEBUG,"auth_check_user_ext(): into checking loop");

  if ( ldap_count_entries( _ldap_conn, _ldap_res ) < 1 ) 
    {
      trace (TRACE_DEBUG,"auth_check_user_ext(): none found");
      return 0; 
    } 

  /* do the first entry here */
  _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
  if ( _ldap_msg == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_check_user_ext(): ldap_first_entry failed: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

  /* we'll get the next entry at the _end_ of the loop! */
  for ( i = 0; i < j; i++ )
    {
      _ldap_vals = ldap_get_values( _ldap_conn, _ldap_msg, _cfg_ldap_field_cid 
); // FIXME: what field is this?

      /* do a recursive search for deliver_to */
      trace (TRACE_DEBUG,"auth_check_user_ext(): checking user %s to 
%s",address, _ldap_vals[0]);
      occurences += auth_check_user_ext(_ldap_vals[0], userids, fwds, 1);

      ldap_value_free( _ldap_vals );

      /* do the next entry here */
      _ldap_msg = ldap_next_entry( _ldap_conn, _ldap_msg );
      if ( _ldap_msg == NULL )
        {
          ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
          trace(TRACE_ERROR,"auth_check_user_ext(): ldap_next_entry failed: 
%s", ldap_err2string( _ldap_err ) );
          return -1;
        }
    }
  
  trace(TRACE_DEBUG,"auth_check_user_ext(): executing query, checks [%d]", 
checks);
  /* trace(TRACE_INFO,"auth_check_user(): user [%s] has [%d] 
entries",address,occurences); */

  ldap_msgfree( _ldap_res );

  return occurences;
}

        
/* 
 * auth_adduser()
 *
 * adds a new user to the database 
 * and adds a INBOX 
 * returns a useridnr on succes, -1 on failure 
 */
u64_t auth_adduser (char *username, char *password, char *enctype, char 
*clientid, char *maxmail)
{
  int i, j, ret;
  int NUM_MODS = 8;
  char *kaboom = "123";
  char *cn_values[]  = { username,      NULL };
  char *sn_values[]  = { username,      NULL };
  char *obj_values[] = { "top", "person", _cfg_ldap_objectclass,        NULL };
  char *uid_values[] = { username,      NULL };
  char *cid_values[] = { clientid,      NULL };
  char *nid_values[] = { kaboom,        NULL };
  char *max_values[] = { maxmail,       NULL };

  /* Make the malloc for all of the pieces we're about to to sprintf into it */
  _ldap_dn = (char *)my_malloc( strlen( "cn=," ) + strlen( username ) + strlen( 
_cfg_ldap_base_dn ) + 1 );

  sprintf( _ldap_dn, "cn=%s,%s", username, _cfg_ldap_base_dn );
  trace( TRACE_DEBUG, "Adding user with DN of [%s]", _ldap_dn );

  /* Construct the array of LDAPMod structures representing the attributes 
   * of the new entry. */

  _ldap_mod = ( LDAPMod ** ) my_malloc( ( NUM_MODS + 1 ) * sizeof( LDAPMod * ) 
);

  if ( _ldap_mod == NULL )
    {
      trace( TRACE_ERROR, "Cannot allocate memory for mods array" );
      return -1;
    }

  for ( i = 0; i < NUM_MODS; i++ )
    {
      if ( ( _ldap_mod[ i ] = ( LDAPMod * ) my_malloc( sizeof( LDAPMod ) ) ) == 
NULL )
        {
          trace( TRACE_ERROR, "Cannot allocate memory for mods element %d", i );
          /* Free everything that did get allocated, which is (i-1) elements */
          for( j = 0; j < (i-1); j++ )
            my_free( _ldap_mod[j] );
          my_free( _ldap_mod );
          ldap_msgfree( _ldap_res );
          return -1;
        }
    }

  i=0;
  trace( TRACE_DEBUG, "Starting to define LDAPMod element %d type %s value %s", 
i, "objectclass", obj_values[0] );
  _ldap_mod[i]->mod_op = LDAP_MOD_ADD;
  _ldap_mod[i]->mod_type = "objectclass";
  _ldap_mod[i]->mod_values = obj_values;

  i++;
  trace( TRACE_DEBUG, "Starting to define LDAPMod element %d type %s value %s", 
i, "cn", cn_values[0] );
  _ldap_mod[i]->mod_op = LDAP_MOD_ADD;
  _ldap_mod[i]->mod_type = "cn";
  _ldap_mod[i]->mod_values = cn_values;

  i++;
  trace( TRACE_DEBUG, "Starting to define LDAPMod element %d type %s value %s", 
i, "sn", cn_values[0] );
  _ldap_mod[i]->mod_op = LDAP_MOD_ADD;
  _ldap_mod[i]->mod_type = "sn";
  _ldap_mod[i]->mod_values = cn_values;

  i++;
  trace( TRACE_DEBUG, "Starting to define LDAPMod element %d type %s value %s", 
i, "mail", sn_values[0] );
  _ldap_mod[i]->mod_op = LDAP_MOD_ADD;
  _ldap_mod[i]->mod_type = "mail";
  _ldap_mod[i]->mod_values = sn_values;

  i++;
  trace( TRACE_DEBUG, "Starting to define LDAPMod element %d type %s value %s", 
i, _cfg_ldap_field_uid, uid_values[0] );
  _ldap_mod[i]->mod_op = LDAP_MOD_ADD;
  _ldap_mod[i]->mod_type = _cfg_ldap_field_uid;
  _ldap_mod[i]->mod_values = uid_values;
  i++;
  trace( TRACE_DEBUG, "Starting to define LDAPMod element %d type %s value %s", 
i, _cfg_ldap_field_cid, cid_values[0] );
  _ldap_mod[i]->mod_op = LDAP_MOD_ADD;
  _ldap_mod[i]->mod_type = _cfg_ldap_field_cid;
  _ldap_mod[i]->mod_values = cid_values;

  i++;
  trace( TRACE_DEBUG, "Starting to define LDAPMod element %d type %s value %s", 
i, _cfg_ldap_field_maxmail, max_values[0] );
  _ldap_mod[i]->mod_op = LDAP_MOD_ADD;
  _ldap_mod[i]->mod_type = _cfg_ldap_field_maxmail;
  _ldap_mod[i]->mod_values = max_values;

  /* FIXME: need to quackulate a free numeric user id number */
  i++;
  trace( TRACE_DEBUG, "Starting to define LDAPMod element %d type %s value %s", 
i, _cfg_ldap_field_nid, nid_values[0] );
  _ldap_mod[i]->mod_op = LDAP_MOD_ADD;
  _ldap_mod[i]->mod_type = _cfg_ldap_field_nid;
  _ldap_mod[i]->mod_values = nid_values;

  i++;
  trace( TRACE_DEBUG, "Placing a NULL to terminate the LDAPMod array at element 
%d", i );
  _ldap_mod[i] = NULL;

  trace( TRACE_DEBUG, "auth_adduser(): calling ldap_add_s( _ldap_conn, 
_ldap_dn, _ldap_mod )" );
  _ldap_err = ldap_add_s( _ldap_conn, _ldap_dn, _ldap_mod );

  /* make sure to free this stuff even if we do bomb out! */
  for( i = 0; i < NUM_MODS; i++ )
    my_free( _ldap_mod[i] );
  my_free( _ldap_mod );

  ldap_memfree( _ldap_dn );

  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_adduser(): could not add user: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

  return strtoull( nid_values[0], 0, 0 );
}


int auth_delete_user(const char *username)
{
  /* look up who's got that username, get their dn, and delete it! */
  if ( !username )
    {
      trace(TRACE_ERROR,"auth_get_userid(): got NULL as useridnr");
      return 0;
    }

  snprintf( _ldap_query, AUTH_QUERY_SIZE, "(%s=%s)", _cfg_ldap_field_uid, 
username );
  trace(TRACE_DEBUG,"auth_delete_user(): searching with query [%s]", 
_ldap_query );
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_delete_user(): could not execute query: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

  if ( ldap_count_entries( _ldap_conn, _ldap_res ) < 1 ) 
    {
      trace (TRACE_DEBUG,"auth_delete_user(): no entries found");
      ldap_msgfree( _ldap_res );
      return 0; 
    } 

  _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
  if ( _ldap_msg == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_delete_user(): ldap_first_entry failed: %s", 
ldap_err2string( _ldap_err ) );
      ldap_msgfree( _ldap_res );
      return -1;
    }

  _ldap_dn = ldap_get_dn( _ldap_conn, _ldap_msg );

  if ( _ldap_dn )
    {
      trace(TRACE_DEBUG,"auth_delete_user(): deleting user at dn [%s]", 
_ldap_dn );
      _ldap_err = ldap_delete_s( _ldap_conn, _ldap_dn );
      if( _ldap_err )
        {
          trace(TRACE_ERROR, "auth_delete_user(): could not delete dn: %s", 
ldap_err2string( _ldap_err ) );
          ldap_memfree( _ldap_dn );
          ldap_msgfree( _ldap_res );
          return -1;
        }
    }

  ldap_memfree( _ldap_dn );
  ldap_msgfree( _ldap_res );
  
  return 0;
}
  
int auth_change_username(u64_t useridnr, const char *newname)
{
  int i, j, NUM_MODS = 2;
  char *new_values[] = { newname,       NULL };

  if ( !useridnr )
    {
      trace(TRACE_ERROR,"auth_change_username(): got NULL as useridnr");
      return 0;
    }

  if ( !newname )
    {
      trace(TRACE_ERROR,"auth_change_username(): got NULL as newname");
      return 0;
    }

  snprintf( _ldap_query, AUTH_QUERY_SIZE, "(%s=%llu)", _cfg_ldap_field_nid, 
useridnr );
  trace(TRACE_DEBUG,"auth_change_username(): searching with query [%s]", 
_ldap_query );
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_change_username(): could not execute query: %s", 
ldap_err2string( _ldap_err ) );
      return 0;
    }

  if ( ldap_count_entries( _ldap_conn, _ldap_res ) < 1 ) 
    {
      trace (TRACE_DEBUG,"auth_change_username(): no entries found");
      ldap_msgfree( _ldap_res );
      return 0; 
    } 

  _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
  if ( _ldap_msg == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_change_username(): ldap_first_entry failed: %s", 
ldap_err2string( _ldap_err ) );
      ldap_msgfree( _ldap_res );
      return 0;
    }

  _ldap_dn = ldap_get_dn( _ldap_conn, _ldap_msg );
  if ( _ldap_dn == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_change_username(): ldap_get_dn failed: %s", 
ldap_err2string( _ldap_err ) );
      ldap_msgfree( _ldap_res );
      return -1;
    }
  trace(TRACE_DEBUG,"auth_change_username(): found something at [%s]", _ldap_dn 
);

  /* Construct the array of LDAPMod structures representing the attributes 
   * of the new entry. */

  _ldap_mod = ( LDAPMod ** ) my_malloc( ( NUM_MODS + 1 ) * sizeof( LDAPMod * ) 
);

  if ( _ldap_mod == NULL )
    {
      trace( TRACE_ERROR, "Cannot allocate memory for mods array" );
      ldap_memfree( _ldap_dn );
      ldap_msgfree( _ldap_res );
      return -1;
    }

  for ( i = 0; i < NUM_MODS; i++ )
    {
      if ( ( _ldap_mod[ i ] = ( LDAPMod * ) my_malloc( sizeof( LDAPMod ) ) ) == 
NULL )
        {
          trace( TRACE_ERROR, "Cannot allocate memory for mods element %d", i );
          /* Free everything that did get allocated, which is (i-1) elements */
          for( j = 0; j < (i-1); j++ )
            my_free( _ldap_mod[j] );
          my_free( _ldap_mod );
          ldap_memfree( _ldap_dn );
          ldap_msgfree( _ldap_res );
          return -1;
        }
    }

  i=0;
  trace( TRACE_DEBUG, "Starting to define LDAPMod element %d type %s value %s", 
i, _cfg_ldap_field_uid, new_values[0] );
  _ldap_mod[i]->mod_op = LDAP_MOD_REPLACE;
  _ldap_mod[i]->mod_type = _cfg_ldap_field_uid;
  _ldap_mod[i]->mod_values = new_values;

  i++;
  trace( TRACE_DEBUG, "Placing a NULL to terminate the LDAPMod array at element 
%d", i );
  _ldap_mod[i] = NULL;

  trace( TRACE_DEBUG, "auth_change_username(): calling ldap_modify_s( 
_ldap_conn, _ldap_dn, _ldap_mod )" );
  _ldap_err = ldap_modify_s( _ldap_conn, _ldap_dn, _ldap_mod );

  /* make sure to free this stuff even if we do bomb out! */
  for( i = 0; i < NUM_MODS; i++ )
    my_free( _ldap_mod[i] );
  my_free( _ldap_mod );

  ldap_memfree( _ldap_dn );
  ldap_msgfree( _ldap_res );
  
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_change_username(): could not change username: 
%s", ldap_err2string( _ldap_err ) );
      return -1;
    }

  return 1;
}


int auth_change_password(u64_t useridnr, const char *newpass, const char 
*enctype)
{
  return -1;
}


int auth_change_clientid(u64_t useridnr, u64_t newcid)
{
  int i, j, NUM_MODS = 2;
  char *newcid_str[100];
  char *new_values[] = { newcid_str,    NULL };

  if ( !useridnr )
    {
      trace(TRACE_ERROR,"auth_change_clientid(): got NULL as useridnr");
      return 0;
    }

  if ( !newcid )
    {
      trace(TRACE_ERROR,"auth_change_clientid(): got NULL as newcid");
      return 0;
    }

  snprintf( new_values[0], 100, "%llu", newcid ); // Yeah, something like 
this...

  snprintf( _ldap_query, AUTH_QUERY_SIZE, "(%s=%llu)", _cfg_ldap_field_nid, 
useridnr );
  trace(TRACE_DEBUG,"auth_change_clientid(): searching with query [%s]", 
_ldap_query );
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_change_clientid(): could not execute query: %s", 
ldap_err2string( _ldap_err ) );
      return 0;
    }

  if ( ldap_count_entries( _ldap_conn, _ldap_res ) < 1 ) 
    {
      trace (TRACE_DEBUG,"auth_change_clientid(): no entries found");
      ldap_msgfree( _ldap_res );
      return 0; 
    } 

  _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
  if ( _ldap_msg == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_change_clientid(): ldap_first_entry failed: %s", 
ldap_err2string( _ldap_err ) );
      ldap_msgfree( _ldap_res );
      return 0;
    }

  _ldap_dn = ldap_get_dn( _ldap_conn, _ldap_msg );
  if ( _ldap_dn == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_change_clientid(): ldap_get_dn failed: %s", 
ldap_err2string( _ldap_err ) );
      ldap_msgfree( _ldap_res );
      return -1;
    }
  trace(TRACE_DEBUG,"auth_change_clientid(): found something at [%s]", _ldap_dn 
);

  /* Construct the array of LDAPMod structures representing the attributes 
   * of the new entry. */

  _ldap_mod = ( LDAPMod ** ) my_malloc( ( NUM_MODS + 1 ) * sizeof( LDAPMod * ) 
);

  if ( _ldap_mod == NULL )
    {
      trace( TRACE_ERROR, "Cannot allocate memory for mods array" );
      ldap_memfree( _ldap_dn );
      ldap_msgfree( _ldap_res );
      return -1;
    }

  for ( i = 0; i < NUM_MODS; i++ )
    {
      if ( ( _ldap_mod[ i ] = ( LDAPMod * ) my_malloc( sizeof( LDAPMod ) ) ) == 
NULL )
        {
          trace( TRACE_ERROR, "Cannot allocate memory for mods element %d", i );
          /* Free everything that did get allocated, which is (i-1) elements */
          for( j = 0; j < (i-1); j++ )
            my_free( _ldap_mod[j] );
          my_free( _ldap_mod );
          ldap_memfree( _ldap_dn );
          ldap_msgfree( _ldap_res );
          return -1;
        }
    }

  i=0;
  trace( TRACE_DEBUG, "Starting to define LDAPMod element %d type %s value %s", 
i, _cfg_ldap_field_cid, new_values[0] );
  _ldap_mod[i]->mod_op = LDAP_MOD_REPLACE;
  _ldap_mod[i]->mod_type = _cfg_ldap_field_cid;
  _ldap_mod[i]->mod_values = new_values;

  i++;
  trace( TRACE_DEBUG, "Placing a NULL to terminate the LDAPMod array at element 
%d", i );
  _ldap_mod[i] = NULL;

  trace( TRACE_DEBUG, "auth_change_clientid(): calling ldap_modify_s( 
_ldap_conn, _ldap_dn, _ldap_mod )" );
  _ldap_err = ldap_modify_s( _ldap_conn, _ldap_dn, _ldap_mod );

  /* make sure to free this stuff even if we do bomb out! */
  for( i = 0; i < NUM_MODS; i++ )
    my_free( _ldap_mod[i] );
  my_free( _ldap_mod );

  ldap_memfree( _ldap_dn );
  ldap_msgfree( _ldap_res );
  
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_change_clientid(): could not change clientid: 
%s", ldap_err2string( _ldap_err ) );
      return -1;
    }

  return 1;
}

int auth_change_mailboxsize(u64_t useridnr, u64_t newsize)
{
  int i, j, NUM_MODS = 2;
  char *newsize_str[100];
  char *new_values[] = { newsize_str,   NULL };

  if ( !useridnr )
    {
      trace(TRACE_ERROR,"auth_change_mailboxsize(): got NULL as useridnr");
      return 0;
    }

  if ( !newsize )
    {
      trace(TRACE_ERROR,"auth_change_mailboxsize(): got NULL as newsize");
      return 0;
    }

  snprintf( new_values[0], 100, "%llu", newsize );

  snprintf( _ldap_query, AUTH_QUERY_SIZE, "(%s=%llu)", _cfg_ldap_field_nid, 
useridnr );
  trace(TRACE_DEBUG,"auth_change_mailboxsize(): searching with query [%s]", 
_ldap_query );
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_change_mailboxsize(): could not execute query: 
%s", ldap_err2string( _ldap_err ) );
      return 0;
    }

  if ( ldap_count_entries( _ldap_conn, _ldap_res ) < 1 ) 
    {
      trace (TRACE_DEBUG,"auth_change_mailboxsize(): no entries found");
      ldap_msgfree( _ldap_res );
      return 0; 
    } 

  _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
  if ( _ldap_msg == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_change_mailboxsize(): ldap_first_entry failed: 
%s", ldap_err2string( _ldap_err ) );
      ldap_msgfree( _ldap_res );
      return 0;
    }

  _ldap_dn = ldap_get_dn( _ldap_conn, _ldap_msg );
  if ( _ldap_dn == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_change_mailboxsize(): ldap_get_dn failed: %s", 
ldap_err2string( _ldap_err ) );
      ldap_msgfree( _ldap_res );
      return -1;
    }
  trace(TRACE_DEBUG,"auth_change_mailboxsize(): found something at [%s]", 
_ldap_dn );

  /* Construct the array of LDAPMod structures representing the attributes 
   * of the new entry. */

  _ldap_mod = ( LDAPMod ** ) my_malloc( ( NUM_MODS + 1 ) * sizeof( LDAPMod * ) 
);

  if ( _ldap_mod == NULL )
    {
      trace( TRACE_ERROR, "Cannot allocate memory for mods array" );
      ldap_memfree( _ldap_dn );
      ldap_msgfree( _ldap_res );
      return -1;
    }

  for ( i = 0; i < NUM_MODS; i++ )
    {
      if ( ( _ldap_mod[ i ] = ( LDAPMod * ) my_malloc( sizeof( LDAPMod ) ) ) == 
NULL )
        {
          trace( TRACE_ERROR, "Cannot allocate memory for mods element %d", i );
          /* Free everything that did get allocated, which is (i-1) elements */
          for( j = 0; j < (i-1); j++ )
            my_free( _ldap_mod[j] );
          my_free( _ldap_mod );
          ldap_memfree( _ldap_dn );
          ldap_msgfree( _ldap_res );
          return -1;
        }
    }

  i=0;
  trace( TRACE_DEBUG, "Starting to define LDAPMod element %d type %s value %s", 
i, _cfg_ldap_field_maxmail, new_values[0] );
  _ldap_mod[i]->mod_op = LDAP_MOD_REPLACE;
  _ldap_mod[i]->mod_type = _cfg_ldap_field_maxmail;
  _ldap_mod[i]->mod_values = new_values;

  i++;
  trace( TRACE_DEBUG, "Placing a NULL to terminate the LDAPMod array at element 
%d", i );
  _ldap_mod[i] = NULL;

  trace( TRACE_DEBUG, "auth_change_mailboxsize(): calling ldap_modify_s( 
_ldap_conn, _ldap_dn, _ldap_mod )" );
  _ldap_err = ldap_modify_s( _ldap_conn, _ldap_dn, _ldap_mod );

  /* make sure to free this stuff even if we do bomb out! */
  for( i = 0; i < NUM_MODS; i++ )
    my_free( _ldap_mod[i] );
  my_free( _ldap_mod );

  ldap_memfree( _ldap_dn );
  ldap_msgfree( _ldap_res );
  
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_change_mailboxsize(): could not change 
mailboxsize: %s", ldap_err2string( _ldap_err ) );
      return -1;
    }

  return 1;
}


/* 
 * auth_validate()
 *
 * tries to validate user 'user'
 *
 * returns useridnr on OK, 0 on validation failed, -1 on error 
 */
u64_t auth_validate (char *user, char *password)
{
  u64_t id;
  int is_validated = 0;
  char timestr[30];
  time_t td;
  struct tm tm;

  time(&td);              /* get time */
  tm = *localtime(&td);   /* get components */
  strftime(timestr, sizeof(timestr), "%G-%m-%d %H:%M:%S", &tm);

  snprintf( _ldap_query, AUTH_QUERY_SIZE, "(%s=%s)", _cfg_ldap_field_uid, user 
);
  trace (TRACE_DEBUG,"auth_validate(): searching with query [%s]",_ldap_query);
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_validate(): could not search for user: %s", 
ldap_err2string( _ldap_err ) );
      return -1;
    }

  if ( ldap_count_entries( _ldap_conn, _ldap_res ) > 0 )
    {
      _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
      if( _ldap_msg == NULL )
        {
          trace(TRACE_ERROR, "auth_validate(): could not get first entry: %s", 
ldap_err2string( _ldap_err ) );
          return -1;
        }
    }
  else
    {
      /* user does not exist */
      trace (TRACE_DEBUG,"auth_validate(): user [%s] not found",user);
      return 0;
    }

  _ldap_dn = ldap_get_dn( _ldap_conn, _ldap_msg );

  /* now, try to rebind as the given DN using the supplied password */
  trace (TRACE_ERROR,"auth_validate(): rebinding as [%s] to validate 
password",_ldap_dn);

  _ldap_err = ldap_bind_s( _ldap_conn, _ldap_dn, password, LDAP_AUTH_SIMPLE );
  ldap_memfree( _ldap_dn );

  // FIXME: do we need to bind back to the dbmail "superuser" again?
  if( _ldap_err )
    {
      trace(TRACE_ERROR,"auth_validate(): ldap_bind_s failed: %s", 
ldap_err2string( _ldap_err ) );
      return 0;
    }
  else 
    {
      _ldap_vals = ldap_get_values( _ldap_conn, _ldap_msg, _cfg_ldap_field_nid 
);
      trace (TRACE_ERROR,"auth_validate(): returning numeric id 
[%s]",_ldap_vals[0]);
      id = (_ldap_vals[0]) ? strtoull(_ldap_vals[0], NULL, 10) : 0;

      /* FIXME: implement this in LDAP...  log login in the dbase
      snprintf(__auth_query_data, AUTH_QUERY_SIZE, "UPDATE users SET last_login 
= '%s' "
               "WHERE user_idnr = %llu", timestr, id);
      
      if (__auth_query(__auth_query_data)==-1)
        trace(TRACE_ERROR, "auth_validate(): could not update user login time");
      */
    }

  ldap_msgfree( _ldap_res );
  ldap_value_free( _ldap_vals );

  return id;
}

u64_t auth_md5_validate (char *username,unsigned char *md5_apop_he, char 
*apop_stamp)
{
  /* returns useridnr on OK, 0 on validation failed, -1 on error */
  
  return 0;
}


/* Given a useridnr, find the account/login name
 * return 0 if not found, NULL on error
 */
char *auth_get_userid (u64_t *useridnr)
{
  char *returnid = NULL;
  
  if ( !useridnr )
    {
      trace(TRACE_ERROR,"auth_get_userid(): got NULL as useridnr");
      return 0;
    }

  snprintf( _ldap_query, AUTH_QUERY_SIZE, "(%s=%llu)", _cfg_ldap_field_nid, 
*useridnr );
  trace(TRACE_DEBUG,"auth_get_userid(): searching with query [%s]", _ldap_query 
);
  _ldap_err = ldap_search_s( _ldap_conn, _cfg_ldap_base_dn, 
_cfg_ldap_scope_int, _ldap_query, _ldap_attrs, _ldap_attrsonly, &_ldap_res );
  if ( _ldap_err )
    {
      trace(TRACE_ERROR, "auth_get_userid(): could not execute query: %s", 
ldap_err2string( _ldap_err ) );
      return NULL;
    }

  if ( ldap_count_entries( _ldap_conn, _ldap_res ) < 1 ) 
    {
      trace (TRACE_DEBUG,"auth_get_userid(): no entries found");
      return 0; 
    } 

  _ldap_msg = ldap_first_entry( _ldap_conn, _ldap_res );
  if ( _ldap_msg == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_get_userid(): ldap_first_entry failed: %s", 
ldap_err2string( _ldap_err ) );
      return NULL;
    }

  _ldap_dn = ldap_get_dn( _ldap_conn, _ldap_msg );
  if ( _ldap_dn == NULL )
    {
      ldap_get_option(_ldap_conn, LDAP_OPT_ERROR_NUMBER, &_ldap_err);
      trace(TRACE_ERROR,"auth_get_userid(): ldap_get_dn failed: %s", 
ldap_err2string( _ldap_err ) );
      return NULL;
    }
  trace(TRACE_DEBUG,"auth_get_userid(): found something at [%s]", _ldap_dn );
  ldap_memfree( _ldap_dn );

  _ldap_vals = ldap_get_values( _ldap_conn, _ldap_msg, _cfg_ldap_field_uid );

  if ( _ldap_vals )
    {
      if ( !( returnid = (char *)my_malloc( strlen( _ldap_vals[0] ) + 1 ) ) )
        {
          trace( TRACE_ERROR, "auth_get_userid(): out of memory" );
          return NULL;
        }
          
      /* this is safe because we calculated the size three lines ago */
      strcpy ( returnid, _ldap_vals[0] );
    }

  ldap_value_free( _ldap_vals );
  ldap_msgfree( _ldap_res );
  
  return returnid;
}

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