/*

   netgroup.c - netgroup lookup routines

   Parts of this file were part of the nss_ldap library (as ldap-netgrp.c)

   which has been forked into the nss-pam-ldapd library.

   Copyright (C) 1997-2005 Luke Howard

   Copyright (C) 2006 West Consulting

   Copyright (C) 2006-2014 Arthur de Jong

   This library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with this library; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

   02110-1301 USA

*/

#include "config.h"

#include <stdio.h>

#include <stdlib.h>

#include <stdarg.h>

#include <ctype.h>

#include <sys/types.h>

#include <sys/param.h>

#include <string.h>

#include "common.h"

#include "log.h"

#include "myldap.h"

#include "cfg.h"

#include "attmap.h"

/* ( nisSchema.2.8 NAME 'nisNetgroup' SUP top STRUCTURAL

 *   DESC 'Abstraction of a netgroup. May refer to other netgroups'

 *   MUST cn

 *   MAY ( nisNetgroupTriple $ memberNisNetgroup $ description ) )

 */

/* the search base for searches */

const char *netgroup_bases[NSS_LDAP_CONFIG_MAX_BASES] = { NULL };

/* the search scope for searches */

int netgroup_scope = LDAP_SCOPE_DEFAULT;

/* the basic search filter for searches */

const char *netgroup_filter = "(objectClass=nisNetgroup)";

/* the attributes to request with searches */

const char *attmap_netgroup_cn                = "cn";

const char *attmap_netgroup_nisNetgroupTriple = "nisNetgroupTriple";

const char *attmap_netgroup_memberNisNetgroup = "memberNisNetgroup";

/* the attribute list to request with searches */

static const char *netgroup_attrs[4];

static int mkfilter_netgroup_byname(const char *name,

                                    char *buffer, size_t buflen)

{

  char safename[BUFLEN_SAFENAME];

  /* escape attribute */

  if (myldap_escape(name, safename, sizeof(safename)))

  {

    log_log(LOG_ERR, "mkfilter_netgroup_byname(): safename buffer too small");

    return -1;

  }

  /* build filter */

  return mysnprintf(buffer, buflen, "(&%s(%s=%s))",

                    netgroup_filter, attmap_netgroup_cn, safename);

}

void netgroup_init(void)

{

  int i;

  /* set up search bases */

  if (netgroup_bases[0] == NULL)

    for (i = 0; i < NSS_LDAP_CONFIG_MAX_BASES; i++)

      netgroup_bases[i] = nslcd_cfg->bases[i];

  /* set up scope */

  if (netgroup_scope == LDAP_SCOPE_DEFAULT)

    netgroup_scope = nslcd_cfg->scope;

  /* set up attribute list */

  netgroup_attrs[0] = attmap_netgroup_cn;

  netgroup_attrs[1] = attmap_netgroup_nisNetgroupTriple;

  netgroup_attrs[2] = attmap_netgroup_memberNisNetgroup;

  netgroup_attrs[3] = NULL;

}

static int write_string_stripspace_len(TFILE *fp, const char *str, int len)

{

  int32_t tmpint32;

  int i, j;

  DEBUG_PRINT("WRITE_STRING: var=" __STRING(str) " string=\"%s\"", str);

  /* skip leading spaces */

  for (i = 0; (str[i] != '\0') && (isspace(str[i])); i++)

    /* nothing */ ;

  /* skip trailing spaces */

  for (j = len; (j > i) && (isspace(str[j - 1])); j--)

    /* nothing */ ;

  /* write length of string */

  WRITE_INT32(fp, j - i);

  /* write string itself */

  if (j > i)

  {

    WRITE(fp, str + i, j - i);

  }

  /* we're done */

  return 0;

}

#define WRITE_STRING_STRIPSPACE_LEN(fp, str, len)                           \

  if (write_string_stripspace_len(fp, str, len))                            \

    return -1;

#define WRITE_STRING_STRIPSPACE(fp, str)                                    \

  WRITE_STRING_STRIPSPACE_LEN(fp, str, strlen(str))

static int write_netgroup_triple(TFILE *fp, MYLDAP_ENTRY *entry,

                                 const char *triple)

{

  int32_t tmpint32;

  int i;

  int hostb, hoste, userb, usere, domainb, domaine;

  /* skip leading spaces */

  for (i = 0; (triple[i] != '\0') && (isspace(triple[i])); i++)

    /* nothing */ ;

  /* we should have a bracket now */

  if (triple[i] != '(')

  {

    log_log(LOG_WARNING, "%s: %s: does not begin with '('",

            myldap_get_dn(entry), attmap_netgroup_nisNetgroupTriple);

    return 0;

  }

  i++;

  hostb = i;

  /* find comma (end of host string) */

  for (; (triple[i] != '\0') && (triple[i] != ','); i++)

    /* nothing */ ;

  hoste = i;

  if (triple[i++] != ',')

  {

    log_log(LOG_WARNING, "%s: %s: missing ','",

            myldap_get_dn(entry), attmap_netgroup_nisNetgroupTriple);

    return 0;

  }

  userb = i;

  /* find comma (end of user string) */

  for (; (triple[i] != '\0') && (triple[i] != ','); i++)

    /* nothing */ ;

  usere = i;

  if (triple[i++] != ',')

  {

    log_log(LOG_WARNING, "%s: %s: missing ','",

            myldap_get_dn(entry), attmap_netgroup_nisNetgroupTriple);

    return 0;

  }

  domainb = i;

  /* find closing bracket (end of domain string) */

  for (; (triple[i] != '\0') && (triple[i] != ')'); i++)

    /* nothing */ ;

  domaine=i;

  if (triple[i++] != ')')

  {

    log_log(LOG_WARNING, "%s: %s: missing ')'",

            myldap_get_dn(entry), attmap_netgroup_nisNetgroupTriple);

    return 0;

  }

  /* skip trailing spaces */

  for (; (triple[i] != '\0') && (isspace(triple[i])); i++)

    /* nothing */ ;

  /* if anything is left in the string we have a problem */

  if (triple[i] != '\0')

  {

    log_log(LOG_WARNING, "%s: %s: contains trailing data",

            myldap_get_dn(entry), attmap_netgroup_nisNetgroupTriple);

    return 0;

  }

  /* write strings */

  WRITE_INT32(fp, NSLCD_NETGROUP_TYPE_TRIPLE);

  WRITE_STRING_STRIPSPACE_LEN(fp, triple + hostb, hoste - hostb)

  WRITE_STRING_STRIPSPACE_LEN(fp, triple + userb, usere - userb)

  WRITE_STRING_STRIPSPACE_LEN(fp, triple + domainb, domaine - domainb)

  /* we're done */

  return 0;

}

static int write_netgroup(TFILE *fp, MYLDAP_ENTRY *entry, const char *reqname)

{

  int32_t tmpint32;

  int i, j;

  const char **names;

  const char **triples;

  const char **members;

  /* get the netgroup name */

  names = myldap_get_values(entry, attmap_netgroup_cn);

  if ((names == NULL) || (names[0] == NULL))

  {

    log_log(LOG_WARNING, "%s: %s: missing",

            myldap_get_dn(entry), attmap_netgroup_cn);

    return 0;

  }

  /* get the netgroup triples and member */

  triples = myldap_get_values(entry, attmap_netgroup_nisNetgroupTriple);

  members = myldap_get_values(entry, attmap_netgroup_memberNisNetgroup);

  /* write the entries */

  for (i = 0; names[i] != NULL; i++)

    if ((reqname == NULL) || (STR_CMP(reqname, names[i]) == 0))

    {

      /* write first part of result */

      WRITE_INT32(fp, NSLCD_RESULT_BEGIN);

      WRITE_STRING(fp, names[i]);

      /* write the netgroup triples */

      if (triples != NULL)

        for (j = 0; triples[j] != NULL; j++)

          if (write_netgroup_triple(fp, entry, triples[j]))

            return -1;

      /* write netgroup members */

      if (members != NULL)

        for (j = 0; members[j] != NULL; j++)

        {

          /* write triple indicator */

          WRITE_INT32(fp, NSLCD_NETGROUP_TYPE_NETGROUP);

          /* write netgroup name */

          WRITE_STRING_STRIPSPACE(fp, members[j]);

        }

      /* write end of result marker */

      WRITE_INT32(fp, NSLCD_NETGROUP_TYPE_END);

    }

  /* we're done */

  return 0;

}

NSLCD_HANDLE(

  netgroup, byname, NSLCD_ACTION_NETGROUP_BYNAME,

  char name[BUFLEN_NAME];

  char filter[BUFLEN_FILTER];

  READ_STRING(fp, name);

  log_setrequest("netgroup=\"%s\"", name);,

  mkfilter_netgroup_byname(name, filter, sizeof(filter)),

  write_netgroup(fp, entry, name)

)

NSLCD_HANDLE(

  netgroup, all, NSLCD_ACTION_NETGROUP_ALL,

  const char *filter;

  log_setrequest("netgroup(all)");,

  (filter = netgroup_filter, 0),

  write_netgroup(fp, entry, NULL)

)