/*

   cfg.c - functions for configuration information

   This file contains parts that were part of the nss_ldap

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

   Copyright (C) 1997-2005 Luke Howard

   Copyright (C) 2007 West Consulting

   Copyright (C) 2007-2018 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 <string.h>

#include <strings.h>

#include <ctype.h>

#include <assert.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#include <errno.h>

#include <netdb.h>

#include <sys/socket.h>

#ifdef HAVE_GSSAPI_H

#include <gssapi.h>

#endif /* HAVE_GSSAPI_H */

#ifdef HAVE_GSSAPI_GSSAPI_H

#include <gssapi/gssapi.h>

#endif /* HAVE_GSSAPI_GSSAPI_H */

#ifdef HAVE_GSSAPI_GSSAPI_KRB5_H

#include <gssapi/gssapi_krb5.h>

#endif /* HAVE_GSSAPI_GSSAPI_KRB5_H */

#ifdef HAVE_GSSAPI_GSSAPI_GENERIC_H

#include <gssapi/gssapi_generic.h>

#endif /* HAVE_GSSAPI_GSSAPI_GENERIC_H */

#include <sys/types.h>

#include <pwd.h>

#include <grp.h>

#include "common.h"

#include "log.h"

#include "cfg.h"

#include "attmap.h"

#include "common/expr.h"

struct ldap_config *nslcd_cfg = NULL;

/* the maximum line length in the configuration file */

#define MAX_LINE_LENGTH          4096

/* the delimiters of tokens */

#define TOKEN_DELIM " \t\n\r"

/* convenient wrapper macro for ldap_set_option() */

#define LDAP_SET_OPTION(ld, option, invalue)                                \

  rc = ldap_set_option(ld, option, invalue);                                \

  if (rc != LDAP_SUCCESS)                                                   \

  {                                                                         \

    log_log(LOG_ERR, "ldap_set_option(" #option ") failed: %s",             \

            ldap_err2string(rc));                                           \

    exit(EXIT_FAILURE);                                                     \

  }

/* simple strdup wrapper */

static char *xstrdup(const char *s)

{

  char *tmp;

  if (s == NULL)

  {

    log_log(LOG_CRIT, "xstrdup() called with NULL");

    exit(EXIT_FAILURE);

  }

  tmp = strdup(s);

  if (tmp == NULL)

  {

    log_log(LOG_CRIT, "strdup() failed to allocate memory");

    exit(EXIT_FAILURE);

  }

  return tmp;

}

/* check that the condition is true and otherwise log an error

   and bail out */

static inline void check_argumentcount(const char *filename, int lnr,

                                       const char *keyword, int condition)

{

  if (!condition)

  {

    log_log(LOG_ERR, "%s:%d: %s: wrong number of arguments",

            filename, lnr, keyword);

    exit(EXIT_FAILURE);

  }

}

/* This function works like strtok() except that the original string is

   not modified and a pointer within str to where the next token begins

   is returned (this can be used to pass to the function on the next

   iteration). If no more tokens are found or the token will not fit in

   the buffer, NULL is returned. */

static char *get_token(char **line, char *buf, size_t buflen)

{

  size_t len;

  if ((line == NULL) || (*line == NULL) || (**line == '\0') || (buf == NULL))

    return NULL;

  /* find the beginning and length of the token */

  *line += strspn(*line, TOKEN_DELIM);

  len = strcspn(*line, TOKEN_DELIM);

  /* check if there is a token */

  if (len == 0)

  {

    *line = NULL;

    return NULL;

  }

  /* limit the token length */

  if (len >= buflen)

    len = buflen - 1;

  /* copy the token */

  strncpy(buf, *line, len);

  buf[len] = '\0';

  /* skip to the next token */

  *line += len;

  *line += strspn(*line, TOKEN_DELIM);

  /* return the token */

  return buf;

}

static char *get_strdup(const char *filename, int lnr,

                        const char *keyword, char **line)

{

  char token[MAX_LINE_LENGTH];

  check_argumentcount(filename, lnr, keyword,

                      get_token(line, token, sizeof(token)) != NULL);

  return xstrdup(token);

}

static char *get_linedup(const char *filename, int lnr,

                         const char *keyword, char **line)

{

  char *var;

  check_argumentcount(filename, lnr, keyword, (*line != NULL) && (**line != '\0'));

  var = xstrdup(*line);

  /* mark that we are at the end of the line */

  *line = NULL;

  return var;

}

static void get_eol(const char *filename, int lnr,

                    const char *keyword, char **line)

{

  if ((line != NULL) && (*line != NULL) && (**line != '\0'))

  {

    log_log(LOG_ERR, "%s:%d: %s: too many arguments", filename, lnr, keyword);

    exit(EXIT_FAILURE);

  }

}

static int get_int(const char *filename, int lnr,

                   const char *keyword, char **line)

{

  char token[32];

  check_argumentcount(filename, lnr, keyword,

                      get_token(line, token, sizeof(token)) != NULL);

  /* TODO: replace with correct numeric parse */

  return atoi(token);

}

static int parse_boolean(const char *filename, int lnr, const char *value)

{

  if ((strcasecmp(value, "on") == 0) ||

      (strcasecmp(value, "yes") == 0) ||

      (strcasecmp(value, "true") == 0) || (strcasecmp(value, "1") == 0))

    return 1;

  else if ((strcasecmp(value, "off") == 0) ||

           (strcasecmp(value, "no") == 0) ||

           (strcasecmp(value, "false") == 0) || (strcasecmp(value, "0") == 0))

    return 0;

  else

  {

    log_log(LOG_ERR, "%s:%d: not a boolean argument: '%s'",

            filename, lnr, value);

    exit(EXIT_FAILURE);

  }

}

static int get_boolean(const char *filename, int lnr,

                       const char *keyword, char **line)

{

  char token[32];

  check_argumentcount(filename, lnr, keyword,

                      get_token(line, token, sizeof(token)) != NULL);

  return parse_boolean(filename, lnr, token);

}

static const char *print_boolean(int bool)

{

  if (bool) return "yes";

  else      return "no";

}

#define TIME_MINUTES 60

#define TIME_HOURS (60 * 60)

#define TIME_DAYS (60 * 60 * 24)

static time_t parse_time(const char *filename, int lnr, const char *value)

{

  time_t t;

  char *tmp = NULL;

  if (strcasecmp(value, "off") == 0)

    return 0;

  errno = 0;

  t = strtol(value, &tmp, 10);

  if (errno != 0)

  {

    log_log(LOG_ERR, "%s:%d: value out of range: '%s'",

            filename, lnr, value);

    exit(EXIT_FAILURE);

  }

  if ((strcasecmp(tmp, "") == 0) || (strcasecmp(tmp, "s") == 0))

    return t;

  else if (strcasecmp(tmp, "m") == 0)

    return t * TIME_MINUTES;

  else if (strcasecmp(tmp, "h") == 0)

    return t * TIME_HOURS;

  else if (strcasecmp(tmp, "d") == 0)

    return t * TIME_DAYS;

  else

  {

    log_log(LOG_ERR, "%s:%d: invalid time value: '%s'",

            filename, lnr, value);

    exit(EXIT_FAILURE);

  }

}

static time_t get_time(const char *filename, int lnr,

                       const char *keyword, char **line)

{

  char token[32];

  check_argumentcount(filename, lnr, keyword,

                      get_token(line, token, sizeof(token)) != NULL);

  return parse_time(filename, lnr, token);

}

static void print_time(time_t t, char *buffer, size_t buflen)

{

  if (t == 0)

    mysnprintf(buffer, buflen, "off");

  else if ((t % TIME_DAYS) == 0)

    mysnprintf(buffer, buflen, "%ldd", (long)(t / TIME_DAYS));

  else if ((t % TIME_HOURS) == 0)

    mysnprintf(buffer, buflen, "%ldh", (long)(t / TIME_HOURS));

  else if ((t % TIME_MINUTES) == 0)

    mysnprintf(buffer, buflen, "%ldm", (long)(t / TIME_MINUTES));

  else

    mysnprintf(buffer, buflen, "%lds", (long)t);

}

static void handle_uid(const char *filename, int lnr,

                       const char *keyword, char *line,

                       struct ldap_config *cfg)

{

  char token[32];

  struct passwd *pwent;

  char *tmp;

  check_argumentcount(filename, lnr, keyword,

                      get_token(&line, token, sizeof(token)) != NULL);

  get_eol(filename, lnr, keyword, &line);

  /* check if it is a valid numerical uid */

  errno = 0;

  cfg->uid = strtouid(token, &tmp, 10);

  if ((*token != '\0') && (*tmp == '\0') && (errno == 0) && (strchr(token, '-') == NULL))

  {

    /* get the name and gid from the passwd database */

    pwent = getpwuid(cfg->uid);

    if (pwent != NULL)

    {

      if (cfg->gid == NOGID)

        cfg->gid = pwent->pw_gid;

      cfg->uidname = strdup(pwent->pw_name);

      return;

    }

  }

  /* find by name */

  pwent = getpwnam(token);

  if (pwent != NULL)

  {

    cfg->uid = pwent->pw_uid;

    if (cfg->gid == NOGID)

      cfg->gid = pwent->pw_gid;

    cfg->uidname = strdup(token);

    return;

  }

  /* log an error */

  log_log(LOG_ERR, "%s:%d: %s: not a valid uid: '%s'",

          filename, lnr, keyword, token);

  exit(EXIT_FAILURE);

}

static void handle_gid(const char *filename, int lnr,

                       const char *keyword, char *line,

                       gid_t *gid)

{

  char token[32];

  struct group *grent;

  char *tmp;

  check_argumentcount(filename, lnr, keyword,

                      get_token(&line, token, sizeof(token)) != NULL);

  get_eol(filename, lnr, keyword, &line);

  /* check if it is a valid numerical gid */

  errno = 0;

  *gid = strtogid(token, &tmp, 10);

  if ((*token != '\0') && (*tmp == '\0') && (errno == 0) && (strchr(token, '-') == NULL))

    return;

  /* find by name */

  grent = getgrnam(token);

  if (grent != NULL)

  {

    *gid = grent->gr_gid;

    return;

  }

  /* log an error */

  log_log(LOG_ERR, "%s:%d: %s: not a valid gid: '%s'",

          filename, lnr, keyword, token);

  exit(EXIT_FAILURE);

}

static int parse_loglevel(const char *filename, int lnr, const char *value)

{

  if (strcasecmp(value, "crit") == 0)

    return LOG_CRIT;

  else if ((strcasecmp(value, "error") == 0) || (strcasecmp(value, "err") == 0))

    return LOG_ERR;

  else if (strcasecmp(value, "warning")==0)

    return LOG_WARNING;

  else if (strcasecmp(value, "notice")==0)

    return LOG_NOTICE;

  else if (strcasecmp(value, "info")==0)

    return LOG_INFO;

  else if (strcasecmp(value, "debug")==0)

    return LOG_DEBUG;

  else

  {

    log_log(LOG_ERR, "%s:%d: not a log level '%s'",

            filename, lnr, value);

    exit(EXIT_FAILURE);

  }

}

static void handle_log(const char *filename, int lnr,

                       const char *keyword, char *line)

{

  int level = LOG_INFO;

  char scheme[64];

  char loglevel[32];

  check_argumentcount(filename, lnr, keyword,

                      get_token(&line, scheme, sizeof(scheme)) != NULL);

  if (get_token(&line, loglevel, sizeof(loglevel)) != NULL)

    level = parse_loglevel(filename, lnr, loglevel);

  get_eol(filename, lnr, keyword, &line);

  if (strcasecmp(scheme, "none") == 0)

    log_addlogging_none();

  else if (strcasecmp(scheme, "syslog") == 0)

    log_addlogging_syslog(level);

  else if (scheme[0] == '/')

    log_addlogging_file(level, scheme);

  else

  {

    log_log(LOG_ERR, "%s:%d: %s: invalid argument '%s'",

            filename, lnr, keyword, scheme);

    exit(EXIT_FAILURE);

  }

}

/* add a single URI to the list of URIs in the configuration */

static void add_uri(const char *filename, int lnr,

                    struct ldap_config *cfg, const char *uri)

{

  int i;

  /* find the place where to insert the URI */

  for (i = 0; cfg->uris[i].uri != NULL; i++)

    /* nothing */ ;

  /* check for room */

  if (i >= NSS_LDAP_CONFIG_MAX_URIS)

  {

    log_log(LOG_ERR, "%s:%d: maximum number of URIs exceeded",

            filename, lnr);

    exit(EXIT_FAILURE);

  }

  /* append URI to list */

  cfg->uris[i].uri = xstrdup(uri);

}

#ifdef HAVE_LDAP_DOMAIN2HOSTLIST

/* return the domain name of the current host

   the returned string must be freed by caller */

static const char *cfg_getdomainname(const char *filename, int lnr)

{

  const char *fqdn, *domain;

  fqdn = getfqdn();

  if ((fqdn != NULL) && ((domain = strchr(fqdn, '.')) != NULL) && (domain[1] != '\0'))

    return domain + 1;

  log_log(LOG_ERR, "%s:%d: unable to determinate a domain name",

          filename, lnr);

  exit(EXIT_FAILURE);

}

/* add URIs by doing DNS queries for SRV records */

static void add_uris_from_dns(const char *filename, int lnr,

                              struct ldap_config *cfg, const char *domain)

{

  int rc;

  char *hostlist = NULL, *nxt;

  char buf[BUFLEN_HOSTNAME + sizeof("ldap://")];

  log_log(LOG_DEBUG, "query %s for SRV records", domain);

  rc = ldap_domain2hostlist(domain, &hostlist);

  if (rc != LDAP_SUCCESS)

  {

    log_log(LOG_ERR, "%s:%d: no servers found in DNS zone %s: %s",

            filename, lnr, domain, ldap_err2string(rc));

    exit(EXIT_FAILURE);

  }

  if ((hostlist == NULL) || (*hostlist == '\0'))

  {

    log_log(LOG_ERR, "%s:%d: no servers found in DNS zone %s",

            filename, lnr, domain);

    exit(EXIT_FAILURE);

  }

  /* hostlist is a space-separated list of host names that we use to build

     URIs */

  while (hostlist != NULL)

  {

    /* find the next space and split the string there */

    nxt = strchr(hostlist, ' ');

    if (nxt != NULL)

    {

      *nxt = '\0';

      nxt++;

    }

    /* if port is 636, use ldaps:// URI */

    if ((strlen(hostlist) > 4) && (strcmp(hostlist + strlen(hostlist) - 4, ":636") == 0))

    {

      hostlist[strlen(hostlist) - 4] = '\0';

      if (mysnprintf(buf, sizeof(buf), "ldaps://%s", hostlist))

      {

        log_log(LOG_ERR, "add_uris_from_dns(): buf buffer too small (%lu required)",

                (unsigned long) strlen(hostlist) + 8);

        exit(EXIT_FAILURE);

      }

    }

    else

    {

      /* strip default port number */

      if ((strlen(hostlist) > 4) && (strcmp(hostlist + strlen(hostlist) - 4, ":389") == 0))

        hostlist[strlen(hostlist) - 4] = '\0';

      if (mysnprintf(buf, sizeof(buf), "ldap://%s", hostlist))

      {

        log_log(LOG_ERR, "add_uris_from_dns(): buf buffer too small (%lu required)",

                (unsigned long) strlen(hostlist) + 7);

        exit(EXIT_FAILURE);

      }

    }

    log_log(LOG_DEBUG, "add_uris_from_dns(): found uri: %s", buf);

    add_uri(filename, lnr, cfg, buf);

    /* get next entry from list */

    hostlist = nxt;

  }

}

#endif /* HAVE_LDAP_DOMAIN2HOSTLIST */

/* check that the file is not world readable */

static void check_permissions(const char *filename, const char *keyword)

{

  struct stat sb;

  /* get file status */

  if (stat(filename, &sb))

  {

    log_log(LOG_ERR, "cannot stat() %s: %s", filename, strerror(errno));

    exit(EXIT_FAILURE);

  }

  /* check permissions */

  if ((sb.st_mode & 0007) != 0)

  {

    if (keyword != NULL)

      log_log(LOG_ERR, "%s: file should not be world readable if %s is set",

              filename, keyword);

    else

      log_log(LOG_ERR, "%s: file should not be world readable", filename);

    exit(EXIT_FAILURE);

  }

}

/* check whether the specified path is readable */

static void check_readable(const char *filename, int lnr,

                       const char *keyword, const char *path)

{

  if (access(path, R_OK) != 0)

  {

    log_log(LOG_ERR, "%s:%d: %s: error accessing %s: %s",

            filename, lnr, keyword, path, strerror(errno));

    exit(EXIT_FAILURE);

  }

}

/* check whether the specified path is a directory */

static void check_dir(const char *filename, int lnr,

                      const char *keyword, const char *path)

{

  struct stat sb;

  if (stat(path, &sb))

  {

    log_log(LOG_ERR, "%s:%d: %s: cannot stat() %s: %s",

            filename, lnr, keyword, path, strerror(errno));

    exit(EXIT_FAILURE);

  }

  if (!S_ISDIR(sb.st_mode))

  {

    log_log(LOG_ERR, "%s:%d: %s: %s is not a directory",

            filename, lnr, keyword, path);

    exit(EXIT_FAILURE);

  }

}

static void handle_krb5_ccname(const char *filename, int lnr,

                               const char *keyword, char *line)

{

  char token[80];

  const char *ccname;

  const char *ccfile;

  size_t ccenvlen;

  char *ccenv;

#ifdef HAVE_GSS_KRB5_CCACHE_NAME

  OM_uint32 minor_status;

#endif /* HAVE_GSS_KRB5_CCACHE_NAME */

  /* get token */

  check_argumentcount(filename, lnr, keyword,

                      (get_token(&line, token, sizeof(token)) != NULL));

  get_eol(filename, lnr, keyword, &line);

  /* set default kerberos ticket cache for SASL-GSSAPI */

  ccname = token;

  /* check that cache exists and is readable if it is a file */

  if ((strncasecmp(ccname, "FILE:", sizeof("FILE:") - 1) == 0) ||

      (strncasecmp(ccname, "WRFILE:", sizeof("WRFILE:") - 1) == 0))

  {

    ccfile = strchr(ccname, ':') + 1;

    check_readable(filename, lnr, keyword, ccfile);

  }

  /* set the environment variable (we have a memory leak if this option

     is set multiple times) */

  ccenvlen = strlen(ccname) + sizeof("KRB5CCNAME=");

  ccenv = (char *)malloc(ccenvlen);

  if (ccenv == NULL)

  {

    log_log(LOG_CRIT, "malloc() failed to allocate memory");

    exit(EXIT_FAILURE);

  }

  mysnprintf(ccenv, ccenvlen, "KRB5CCNAME=%s", ccname);

  putenv(ccenv);

#ifdef HAVE_GSS_KRB5_CCACHE_NAME

  /* set the name with gss_krb5_ccache_name() */

  if (gss_krb5_ccache_name(&minor_status, ccname, NULL) != GSS_S_COMPLETE)

  {

    log_log(LOG_ERR, "%s:%d: unable to set default credential cache: %s",

            filename, lnr, ccname);

    exit(EXIT_FAILURE);

  }

#endif /* HAVE_GSS_KRB5_CCACHE_NAME */

}

static enum ldap_map_selector parse_map(const char *value)

{

  if ((strcasecmp(value, "alias") == 0) || (strcasecmp(value, "aliases") == 0))

    return LM_ALIASES;

  else if ((strcasecmp(value, "ether") == 0) || (strcasecmp(value, "ethers") == 0))

    return LM_ETHERS;

  else if (strcasecmp(value, "group") == 0)

    return LM_GROUP;

  else if ((strcasecmp(value, "host") == 0) || (strcasecmp(value, "hosts") == 0))

    return LM_HOSTS;

  else if (strcasecmp(value, "netgroup") == 0)

    return LM_NETGROUP;

  else if ((strcasecmp(value, "network") == 0) || (strcasecmp(value, "networks") == 0))

    return LM_NETWORKS;

  else if (strcasecmp(value, "passwd") == 0)

    return LM_PASSWD;

  else if ((strcasecmp(value, "protocol") == 0) || (strcasecmp(value, "protocols") == 0))

    return LM_PROTOCOLS;

  else if (strcasecmp(value, "rpc") == 0)

    return LM_RPC;

  else if ((strcasecmp(value, "service") == 0) || (strcasecmp(value, "services") == 0))

    return LM_SERVICES;

  else if (strcasecmp(value, "shadow") == 0)

    return LM_SHADOW;

  else if (strcasecmp(value, "nfsidmap") == 0)

    return LM_NFSIDMAP;

  /* unknown map */

  return LM_NONE;

}

/* check to see if the line begins with a named map */

static enum ldap_map_selector get_map(char **line)

{

  char token[32];

  char *old;

  enum ldap_map_selector map;

  /* get the token */

  old = *line;

  if (get_token(line, token, sizeof(token)) == NULL)

    return LM_NONE;

  /* see if we found a map */

  map = parse_map(token);

  /* unknown map, return to the previous state */

  if (map == LM_NONE)

    *line = old;

  return map;

}

static const char *print_map(enum ldap_map_selector map)

{

  switch (map)

  {

    case LM_ALIASES:   return "aliases";

    case LM_ETHERS:    return "ethers";

    case LM_GROUP:     return "group";

    case LM_HOSTS:     return "hosts";

    case LM_NETGROUP:  return "netgroup";

    case LM_NETWORKS:  return "networks";

    case LM_PASSWD:    return "passwd";

    case LM_PROTOCOLS: return "protocols";

    case LM_RPC:       return "rpc";

    case LM_SERVICES:  return "services";

    case LM_SHADOW:    return "shadow";

    case LM_NFSIDMAP:  return "nfsidmap";

    case LM_NONE:

    default:           return "???";

  }

}

static void handle_base(const char *filename, int lnr,

                        const char *keyword, char *line,

                        struct ldap_config *cfg)

{

  const char **bases;

  int i;

  char *value;

#ifdef HAVE_LDAP_DOMAIN2DN

  const char *domain = NULL;

  char *domaindn = NULL;

#endif /* HAVE_LDAP_DOMAIN2DN */

  /* get the list of bases to update */

  bases = base_get_var(get_map(&line));

  if (bases == NULL)

    bases = cfg->bases;

  /* rest of the line is the value */

  value = get_linedup(filename, lnr, keyword, &line);

  /* if the base is "DOMAIN" use the domain name */

  if (strcasecmp(value, "domain") == 0)

  {

#ifdef HAVE_LDAP_DOMAIN2DN

    free(value);

    domain = cfg_getdomainname(filename, lnr);

    ldap_domain2dn(domain, &domaindn);

    log_log(LOG_DEBUG, "set_base(): setting base to %s from domain",

            domaindn);

    value = xstrdup(domaindn);

#else /* not HAVE_LDAP_DOMAIN2DN */

    log_log(LOG_ERR, "%s:%d: value %s not supported on platform",

            filename, lnr, value);

    exit(EXIT_FAILURE);

#endif /* not HAVE_LDAP_DOMAIN2DN */

  }

  /* find the spot in the list of bases */

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

    if (bases[i] == NULL)

    {

      bases[i] = value;

      return;

    }

  /* no free spot found */

  log_log(LOG_ERR, "%s:%d: maximum number of base options per map (%d) exceeded",

          filename, lnr, NSS_LDAP_CONFIG_MAX_BASES);

  exit(EXIT_FAILURE);

}

static void handle_scope(const char *filename, int lnr,

                         const char *keyword, char *line,

                         struct ldap_config *cfg)

{

  char token[32];

  int *var;

  var = scope_get_var(get_map(&line));

  check_argumentcount(filename, lnr, keyword,

                      get_token(&line, token, sizeof(token)) != NULL);

  get_eol(filename, lnr, keyword, &line);

  if (var == NULL)

    var = &cfg->scope;

  if ((strcasecmp(token, "sub") == 0) || (strcasecmp(token, "subtree") == 0))

    *var = LDAP_SCOPE_SUBTREE;

  else if ((strcasecmp(token, "one") == 0) || (strcasecmp(token, "onelevel") == 0))

    *var = LDAP_SCOPE_ONELEVEL;

  else if (strcasecmp(token, "base") == 0)

    *var = LDAP_SCOPE_BASE;

#ifdef LDAP_SCOPE_CHILDREN

  else if (strcasecmp(token, "children") == 0)

    *var = LDAP_SCOPE_CHILDREN;

#endif /* LDAP_SCOPE_CHILDREN */

  else

  {

    log_log(LOG_ERR, "%s:%d: not a scope argument: '%s'",

            filename, lnr, token);

    exit(EXIT_FAILURE);

  }

}

static const char *print_scope(int scope)

{

  switch (scope)

  {

    case LDAP_SCOPE_SUBTREE:  return "sub";

    case LDAP_SCOPE_ONELEVEL: return "one";

    case LDAP_SCOPE_BASE:     return "base";

#ifdef LDAP_SCOPE_CHILDREN

    case LDAP_SCOPE_CHILDREN: return "children";

#endif /* LDAP_SCOPE_CHILDREN */

    default:                  return "???";

  }

}

static void handle_deref(const char *filename, int lnr,

                         const char *keyword, char *line,

                         struct ldap_config *cfg)

{

  char token[32];

  check_argumentcount(filename, lnr, keyword,

                      get_token(&line, token, sizeof(token)) != NULL);

  get_eol(filename, lnr, keyword, &line);

  if (strcasecmp(token, "never") == 0)

    cfg->deref = LDAP_DEREF_NEVER;

  else if (strcasecmp(token, "searching") == 0)

    cfg->deref = LDAP_DEREF_SEARCHING;

  else if (strcasecmp(token, "finding") == 0)

    cfg->deref = LDAP_DEREF_FINDING;

  else if (strcasecmp(token, "always") == 0)

    cfg->deref = LDAP_DEREF_ALWAYS;

  else

  {

    log_log(LOG_ERR, "%s:%d: wrong argument: '%s'", filename, lnr, token);

    exit(EXIT_FAILURE);

  }

}

static const char *print_deref(int deref)

{

  switch (deref)

  {

    case LDAP_DEREF_NEVER:     return "never";

    case LDAP_DEREF_SEARCHING: return "searching";

    case LDAP_DEREF_FINDING:   return "finding";

    case LDAP_DEREF_ALWAYS:    return "always";

    default:                   return "???";

  }

}

static void handle_filter(const char *filename, int lnr,

                          const char *keyword, char *line)

{

  const char **var;

  const char *map = line;

  var = filter_get_var(get_map(&line));

  if (var == NULL)

  {

    log_log(LOG_ERR, "%s:%d: unknown map: '%s'", filename, lnr, map);

    exit(EXIT_FAILURE);

  }

  check_argumentcount(filename, lnr, keyword, (line != NULL) && (*line != '\0'));

  /* check if the value will be changed */

  if (strcmp(*var, line) != 0)

  {

    /* Note: we have a memory leak here if a single mapping is changed

       multiple times in one config (deemed not a problem) */

    *var = xstrdup(line);

  }

}

/* this function modifies the statement argument passed */

static void handle_map(const char *filename, int lnr,

                       const char *keyword, char *line)

{

  enum ldap_map_selector map;

  const char **var;

  char oldatt[32], *newatt;

  /* get the map */

  if ((map = get_map(&line)) == LM_NONE)

  {

    log_log(LOG_ERR, "%s:%d: unknown map: '%s'", filename, lnr, line);

    exit(EXIT_FAILURE);

  }

  /* read the other tokens */

  check_argumentcount(filename, lnr, keyword,

                      (get_token(&line, oldatt, sizeof(oldatt)) != NULL));

  newatt = get_linedup(filename, lnr, keyword, &line);

  /* change attribute mapping */

  var = attmap_get_var(map, oldatt);

  if (var == NULL)

  {

    log_log(LOG_ERR, "%s:%d: unknown attribute to map: '%s'",

            filename, lnr, oldatt);

    exit(EXIT_FAILURE);

  }

  if (attmap_set_mapping(var, newatt) == NULL)

  {

    log_log(LOG_ERR, "%s:%d: attribute %s cannot be an expression",

            filename, lnr, oldatt);

    exit(EXIT_FAILURE);

  }

  free(newatt);

}

#ifdef LDAP_OPT_X_TLS

static const char *print_ssl(int ssl)

{

  switch (ssl)

  {

    case SSL_OFF:       return "off";

    case SSL_START_TLS: return "start_tls";

    case SSL_LDAPS:     return "on";

    default:            return "???";

  }

}

static void handle_tls_reqcert(const char *filename, int lnr,

                               const char *keyword, char *line)

{

  char token[16];

  int value, rc;

  /* get token */

  check_argumentcount(filename, lnr, keyword,

                      get_token(&line, token, sizeof(token)) != NULL);

  get_eol(filename, lnr, keyword, &line);

  /* check if it is a valid value for tls_reqcert option */

  if ((strcasecmp(token, "never") == 0) || (strcasecmp(token, "no") == 0))

    value = LDAP_OPT_X_TLS_NEVER;

  else if (strcasecmp(token, "allow") == 0)

    value = LDAP_OPT_X_TLS_ALLOW;

  else if (strcasecmp(token, "try") == 0)

    value = LDAP_OPT_X_TLS_TRY;

  else if ((strcasecmp(token, "demand") == 0) ||

           (strcasecmp(token, "yes") == 0))

    value = LDAP_OPT_X_TLS_DEMAND;

  else if (strcasecmp(token, "hard") == 0)

    value = LDAP_OPT_X_TLS_HARD;

  else

  {

    log_log(LOG_ERR, "%s:%d: %s: invalid argument: '%s'",

            filename, lnr, keyword, token);

    exit(EXIT_FAILURE);

  }

  log_log(LOG_DEBUG, "ldap_set_option(LDAP_OPT_X_TLS_REQUIRE_CERT,%s)", token);

  LDAP_SET_OPTION(NULL, LDAP_OPT_X_TLS_REQUIRE_CERT, &value);

}

static const char *print_tls_reqcert(int value)

{

  switch (value)

  {

    case LDAP_OPT_X_TLS_NEVER:  return "never";