/* nssov.c - nss-ldap overlay for slapd */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>. 
 *
 * Copyright 2008-2021 The OpenLDAP Foundation.
 * Portions Copyright 2008 by Howard Chu, Symas Corp.
 * Portions Copyright 2013 by Ted C. Cheng, Symas Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */
/* ACKNOWLEDGEMENTS:
 * This code references portions of the nss-ldapd package
 * written by Arthur de Jong. The nss-ldapd code was forked
 * from the nss-ldap library written by Luke Howard.
 */

#include "nssov.h"

#ifndef SLAPD_OVER_NSSOV
#define SLAPD_OVER_NSSOV SLAPD_MOD_DYNAMIC
#endif

#include "slap-config.h"

#include "lutil.h"

#include <ac/errno.h>
#include <ac/unistd.h>
#include <fcntl.h>
#include <sys/stat.h>

AttributeDescription *nssov_pam_host_ad;
AttributeDescription *nssov_pam_svc_ad;

/* buffer sizes for I/O */
#define READBUFFER_MINSIZE 32
#define READBUFFER_MAXSIZE 64
#define WRITEBUFFER_MINSIZE 64
#define WRITEBUFFER_MAXSIZE 64*1024

/* Find the given attribute's value in the RDN of the DN */
void nssov_find_rdnval(struct berval *dn, AttributeDescription *ad, struct berval *value)
{
	struct berval rdn;
	char *next;

	BER_BVZERO(value);
	dnRdn( dn, &rdn );
	do {
		next = ber_bvchr( &rdn, '+' );
		if ( rdn.bv_val[ad->ad_cname.bv_len] == '=' &&
			!ber_bvcmp( &rdn, &ad->ad_cname )) {
			if ( next )
				rdn.bv_len = next - rdn.bv_val;
			value->bv_val = rdn.bv_val + ad->ad_cname.bv_len + 1;
			value->bv_len = rdn.bv_len - ad->ad_cname.bv_len - 1;
			break;
		}
		if ( !next )
			break;
		next++;
		rdn.bv_len -= next - rdn.bv_val;
		rdn.bv_val = next;
	} while (1);
}

/* create a search filter using a name that requires escaping */
int nssov_filter_byname(nssov_mapinfo *mi,int key,struct berval *name,struct berval *buf)
{
	char buf2[1024];
	struct berval bv2 = {sizeof(buf2),buf2};

	/* escape attribute */
	if (nssov_escape(name,&bv2))
		return -1;
	/* build filter */
	if (bv2.bv_len + mi->mi_filter.bv_len + mi->mi_attrs[key].an_desc->ad_cname.bv_len + 6 >
		buf->bv_len )
		return -1;
	buf->bv_len = snprintf(buf->bv_val, buf->bv_len, "(&%s(%s=%s))",
		mi->mi_filter.bv_val, mi->mi_attrs[key].an_desc->ad_cname.bv_val,
		bv2.bv_val );
	return 0;
}

/* create a search filter using a string converted from an int */
int nssov_filter_byid(nssov_mapinfo *mi,int key,struct berval *id,struct berval *buf)
{
	/* build filter */
	if (id->bv_len + mi->mi_filter.bv_len + mi->mi_attrs[key].an_desc->ad_cname.bv_len + 6 >
		buf->bv_len )
		return -1;
	buf->bv_len = snprintf(buf->bv_val, buf->bv_len, "(&%s(%s=%s))",
		mi->mi_filter.bv_val, mi->mi_attrs[key].an_desc->ad_cname.bv_val,
		id->bv_val );
	return 0;
}

void get_userpassword(struct berval *attr,struct berval *pw)
{
	int i;
	/* go over the entries and return the remainder of the value if it
		 starts with {crypt} or crypt$ */
	for (i=0;!BER_BVISNULL(&attr[i]);i++)
	{
		if (strncasecmp(attr[i].bv_val,"{crypt}",7)==0) {
			pw->bv_val = attr[i].bv_val + 7;
			pw->bv_len = attr[i].bv_len - 7;
			return;
		}
		if (strncasecmp(attr[i].bv_val,"crypt$",6)==0) {
			pw->bv_val = attr[i].bv_val + 6;
			pw->bv_len = attr[i].bv_len - 6;
			return;
		}
	}
	/* just return the first value completely */
	*pw = *attr;
	/* TODO: support more password formats e.g. SMD5
		(which is $1$ but in a different format)
		(any code for this is more than welcome) */
}

/* this writes a single address to the stream */
int write_address(TFILE *fp,struct berval *addr)
{
	int32_t tmpint32;
	struct in_addr ipv4addr;
	struct in6_addr ipv6addr;
	/* try to parse the address as IPv4 first, fall back to IPv6 */
	if (inet_pton(AF_INET,addr->bv_val,&ipv4addr)>0)
	{
		/* write address type */
		WRITE_INT32(fp,AF_INET);
		/* write the address length */
		WRITE_INT32(fp,sizeof(struct in_addr));
		/* write the address itself (in network byte order) */
		WRITE(fp,&ipv4addr,sizeof(struct in_addr));
	}
	else if (inet_pton(AF_INET6,addr->bv_val,&ipv6addr)>0)
	{
		/* write address type */
		WRITE_INT32(fp,AF_INET6);
		/* write the address length */
		WRITE_INT32(fp,sizeof(struct in6_addr));
		/* write the address itself (in network byte order) */
		WRITE(fp,&ipv6addr,sizeof(struct in6_addr));
	}
	else
	{
		/* failure, log but write simple invalid address
			 (otherwise the address list is messed up) */
		/* TODO: have error message in correct format */
		Debug(LDAP_DEBUG_ANY,"nssov: unparsable address: %s\n",addr->bv_val );
		/* write an illegal address type */
		WRITE_INT32(fp,-1);
		/* write an empty address */
		WRITE_INT32(fp,0);
	}
	/* we're done */
	return 0;
}

int read_address(TFILE *fp,char *addr,int *addrlen,int *af)
{
	int32_t tmpint32;
	int len;
	/* read address family */
	READ_INT32(fp,*af);
	if ((*af!=AF_INET)&&(*af!=AF_INET6))
	{
		Debug(LDAP_DEBUG_ANY,"nssov: incorrect address family specified: %d\n",*af );
		return -1;
	}
	/* read address length */
	READ_INT32(fp,len);
	if ((len>*addrlen)||(len<=0))
	{
		Debug(LDAP_DEBUG_ANY,"nssov: address length incorrect: %d\n",len );
		return -1;
	}
	*addrlen=len;
	/* read address */
	READ(fp,addr,len);
	/* we're done */
	return 0;
}

int nssov_escape(struct berval *src,struct berval *dst)
{
	size_t pos=0;
	int i;
	/* go over all characters in source string */
	for (i=0;i<src->bv_len;i++)
	{
		/* check if char will fit */
		if (pos>=(dst->bv_len-4))
			return -1;
		/* do escaping for some characters */
		switch (src->bv_val[i])
		{
			case '*':
				strcpy(dst->bv_val+pos,"\\2a");
				pos+=3;
				break;
			case '(':
				strcpy(dst->bv_val+pos,"\\28");
				pos+=3;
				break;
			case ')':
				strcpy(dst->bv_val+pos,"\\29");
				pos+=3;
				break;
			case '\\':
				strcpy(dst->bv_val+pos,"\\5c");
				pos+=3;
				break;
			default:
				/* just copy character */
				dst->bv_val[pos++]=src->bv_val[i];
				break;
		}
	}
	/* terminate destination string */
	dst->bv_val[pos]='\0';
	dst->bv_len = pos;
	return 0;
}

/* read the version information and action from the stream
   this function returns the read action in location pointer to by action */
static int read_header(TFILE *fp,int32_t *action)
{
  int32_t tmpint32;
  /* read the protocol version */
  READ_INT32(fp,tmpint32);
  if (tmpint32 != (int32_t)NSLCD_VERSION)
  {
    Debug( LDAP_DEBUG_TRACE,"nssov: wrong nslcd version id (%d)\n",(int)tmpint32 );
    return -1;
  }
  /* read the request type */
  READ_INT32(fp,*action);
  return 0;
}

int nssov_config(nssov_info *ni,TFILE *fp,Operation *op)
{
	int opt;
	int32_t tmpint32;

	READ_INT32(fp,opt);

	Debug(LDAP_DEBUG_TRACE, "nssov_config (%d)\n",opt );

	WRITE_INT32(fp,NSLCD_VERSION);
	WRITE_INT32(fp,NSLCD_ACTION_CONFIG_GET);
	WRITE_INT32(fp,NSLCD_RESULT_BEGIN);

	switch (opt) {
	case NSLCD_CONFIG_PAM_PASSWORD_PROHIBIT_MESSAGE:
		/* request for pam password_prohibit_message */
		/* nssov_pam prohibits password  */
		if (!BER_BVISEMPTY(&ni->ni_pam_password_prohibit_message)) {
			Debug(LDAP_DEBUG_TRACE,"nssov_config(): %s (%s)\n",
				"password_prohibit_message",
				ni->ni_pam_password_prohibit_message.bv_val );
			WRITE_STRING(fp,ni->ni_pam_password_prohibit_message.bv_val);
		}
	default:
		/* all other config options are ignored */
		break;
	}

	WRITE_INT32(fp,NSLCD_RESULT_END);
	return 0;
}


/* read a request message, returns <0 in case of errors,
   this function closes the socket */
static void handleconnection(nssov_info *ni,int sock,Operation *op)
{
  TFILE *fp;
  int32_t action;
  int readtimeout,writetimeout;
  uid_t uid;
  gid_t gid;
  char authid[sizeof("gidNumber=4294967295+uidNumber=424967295,cn=peercred,cn=external,cn=auth")];
  char peerbuf[8];
  struct berval peerbv = { sizeof(peerbuf), peerbuf };

  /* log connection */
  if (LUTIL_GETPEEREID(sock,&uid,&gid,&peerbv)) {
    char ebuf[128];
    int saved_errno = errno;
    Debug( LDAP_DEBUG_TRACE,"nssov: connection from unknown client: %s\n",
                      AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
  } else {
    Debug( LDAP_DEBUG_TRACE,"nssov: connection from uid=%d gid=%d\n",
                      (int)uid,(int)gid );
  }

  /* Should do authid mapping too */
  op->o_dn.bv_len = sprintf(authid,"gidNumber=%d+uidNumber=%d,cn=peercred,cn=external,cn=auth",
	(int)gid, (int)uid );
  op->o_dn.bv_val = authid;
  op->o_ndn = op->o_dn;

  /* set the timeouts:
   * read timeout is half a second because clients should send their request
   * quickly, write timeout is 60 seconds because clients could be taking some
   * time to process the results
   */
  readtimeout = 500;
  writetimeout = 60000;
  /* create a stream object */
  if ((fp=tio_fdopen(sock,readtimeout,writetimeout,
                     READBUFFER_MINSIZE,READBUFFER_MAXSIZE,
                     WRITEBUFFER_MINSIZE,WRITEBUFFER_MAXSIZE))==NULL)
  {
    char ebuf[128];
    int saved_errno = errno;
    Debug( LDAP_DEBUG_ANY,"nssov: cannot create stream for writing: %s",
                      AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
    (void)close(sock);
    return;
  }
  /* read request */
  if (read_header(fp,&action))
  {
    (void)tio_close(fp);
    return;
  }
  /* handle request */
  switch (action)
  {
    case NSLCD_ACTION_ALIAS_BYNAME:     (void)nssov_alias_byname(ni,fp,op); break;
    case NSLCD_ACTION_ALIAS_ALL:        (void)nssov_alias_all(ni,fp,op); break;
    case NSLCD_ACTION_ETHER_BYNAME:     (void)nssov_ether_byname(ni,fp,op); break;
    case NSLCD_ACTION_ETHER_BYETHER:    (void)nssov_ether_byether(ni,fp,op); break;
    case NSLCD_ACTION_ETHER_ALL:        (void)nssov_ether_all(ni,fp,op); break;
    case NSLCD_ACTION_GROUP_BYNAME:     (void)nssov_group_byname(ni,fp,op); break;
    case NSLCD_ACTION_GROUP_BYGID:      (void)nssov_group_bygid(ni,fp,op); break;
    case NSLCD_ACTION_GROUP_BYMEMBER:   (void)nssov_group_bymember(ni,fp,op); break;
    case NSLCD_ACTION_GROUP_ALL:        (void)nssov_group_all(ni,fp,op); break;
    case NSLCD_ACTION_HOST_BYNAME:      (void)nssov_host_byname(ni,fp,op); break;
    case NSLCD_ACTION_HOST_BYADDR:      (void)nssov_host_byaddr(ni,fp,op); break;
    case NSLCD_ACTION_HOST_ALL:         (void)nssov_host_all(ni,fp,op); break;
    case NSLCD_ACTION_NETGROUP_BYNAME:  (void)nssov_netgroup_byname(ni,fp,op); break;
    case NSLCD_ACTION_NETWORK_BYNAME:   (void)nssov_network_byname(ni,fp,op); break;
    case NSLCD_ACTION_NETWORK_BYADDR:   (void)nssov_network_byaddr(ni,fp,op); break;
    case NSLCD_ACTION_NETWORK_ALL:      (void)nssov_network_all(ni,fp,op); break;
    case NSLCD_ACTION_PASSWD_BYNAME:    (void)nssov_passwd_byname(ni,fp,op); break;
    case NSLCD_ACTION_PASSWD_BYUID:     (void)nssov_passwd_byuid(ni,fp,op); break;
    case NSLCD_ACTION_PASSWD_ALL:       (void)nssov_passwd_all(ni,fp,op); break;
    case NSLCD_ACTION_PROTOCOL_BYNAME:  (void)nssov_protocol_byname(ni,fp,op); break;
    case NSLCD_ACTION_PROTOCOL_BYNUMBER:(void)nssov_protocol_bynumber(ni,fp,op); break;
    case NSLCD_ACTION_PROTOCOL_ALL:     (void)nssov_protocol_all(ni,fp,op); break;
    case NSLCD_ACTION_RPC_BYNAME:       (void)nssov_rpc_byname(ni,fp,op); break;
    case NSLCD_ACTION_RPC_BYNUMBER:     (void)nssov_rpc_bynumber(ni,fp,op); break;
    case NSLCD_ACTION_RPC_ALL:          (void)nssov_rpc_all(ni,fp,op); break;
    case NSLCD_ACTION_SERVICE_BYNAME:   (void)nssov_service_byname(ni,fp,op); break;
    case NSLCD_ACTION_SERVICE_BYNUMBER: (void)nssov_service_bynumber(ni,fp,op); break;
    case NSLCD_ACTION_SERVICE_ALL:      (void)nssov_service_all(ni,fp,op); break;
    case NSLCD_ACTION_SHADOW_BYNAME:    if (uid==0) (void)nssov_shadow_byname(ni,fp,op); break;
    case NSLCD_ACTION_SHADOW_ALL:       if (uid==0) (void)nssov_shadow_all(ni,fp,op); break;
	case NSLCD_ACTION_PAM_AUTHC:		(void)pam_authc(ni,fp,op,uid); break;
	case NSLCD_ACTION_PAM_AUTHZ:		(void)pam_authz(ni,fp,op); break;
	case NSLCD_ACTION_PAM_SESS_O:		if (uid==0) (void)pam_sess_o(ni,fp,op); break;
	case NSLCD_ACTION_PAM_SESS_C:		if (uid==0) (void)pam_sess_c(ni,fp,op); break;
	case NSLCD_ACTION_PAM_PWMOD:		(void)pam_pwmod(ni,fp,op,uid); break;
	case NSLCD_ACTION_CONFIG_GET:			(void)nssov_config(ni,fp,op); break;
    default:
      Debug( LDAP_DEBUG_ANY,"nssov: invalid request id: %d",(int)action );
      break;
  }
  /* we're done with the request */
  (void)tio_close(fp);
  return;
}

/* accept a connection on the socket */
static void *acceptconn(void *ctx, void *arg)
{
	nssov_info *ni = arg;
	Connection conn = {0};
	OperationBuffer opbuf;
	Operation *op;
	int csock;

	if ( slapd_shutdown )
		return NULL;

	{
		struct sockaddr_storage addr;
		socklen_t alen;
		int j;

		/* accept a new connection */
		alen=(socklen_t)sizeof(struct sockaddr_storage);
		csock=accept(ni->ni_socket,(struct sockaddr *)&addr,&alen);
		connection_client_enable(ni->ni_conn);
		if (csock<0)
		{
			char ebuf[128];
			int saved_errno = errno;
			if ((errno==EINTR)||(errno==EAGAIN)||(errno==EWOULDBLOCK))
			{
				Debug( LDAP_DEBUG_TRACE,"nssov: accept() failed (ignored): %s",
					AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
				return NULL;
			}
			Debug( LDAP_DEBUG_ANY,"nssov: accept() failed: %s",
				AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			return NULL;
		}
		/* make sure O_NONBLOCK is not inherited */
		if ((j=fcntl(csock,F_GETFL,0))<0)
		{
			char ebuf[128];
			int saved_errno = errno;
			Debug( LDAP_DEBUG_ANY,"nssov: fcntl(F_GETFL) failed: %s",
				AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			if (close(csock)) {
				saved_errno = errno;
				Debug( LDAP_DEBUG_ANY,"nssov: problem closing socket: %s",
					AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			}
			return NULL;
		}
		if (fcntl(csock,F_SETFL,j&~O_NONBLOCK)<0)
		{
			char ebuf[128];
			int saved_errno = errno;
			Debug( LDAP_DEBUG_ANY,"nssov: fcntl(F_SETFL,~O_NONBLOCK) failed: %s",
				AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			if (close(csock)) {
				saved_errno = errno;
				Debug( LDAP_DEBUG_ANY,"nssov: problem closing socket: %s",
					AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			}
			return NULL;
		}
	}
	connection_fake_init( &conn, &opbuf, ctx );
	op=&opbuf.ob_op;
	conn.c_ssf = conn.c_transport_ssf = local_ssf;
	op->o_bd = ni->ni_db;
	op->o_tag = LDAP_REQ_SEARCH;

	/* handle the connection */
	handleconnection(ni,csock,op);

	return NULL;
}

static slap_verbmasks nss_svcs[] = {
	{ BER_BVC("aliases"), NM_alias },
	{ BER_BVC("ethers"), NM_ether },
	{ BER_BVC("group"), NM_group },
	{ BER_BVC("hosts"), NM_host },
	{ BER_BVC("netgroup"), NM_netgroup },
	{ BER_BVC("networks"), NM_network },
	{ BER_BVC("passwd"), NM_passwd },
	{ BER_BVC("protocols"), NM_protocol },
	{ BER_BVC("rpc"), NM_rpc },
	{ BER_BVC("services"), NM_service },
	{ BER_BVC("shadow"), NM_shadow },
	{ BER_BVNULL, 0 }
};

static slap_verbmasks pam_opts[] = {
	{ BER_BVC("userhost"), NI_PAM_USERHOST },
	{ BER_BVC("userservice"), NI_PAM_USERSVC },
	{ BER_BVC("usergroup"), NI_PAM_USERGRP },
	{ BER_BVC("hostservice"), NI_PAM_HOSTSVC },
	{ BER_BVC("authz2dn"), NI_PAM_SASL2DN },
	{ BER_BVC("uid2dn"), NI_PAM_UID2DN },
	{ BER_BVNULL, 0 }
};

enum {
	NSS_SSD=1,
	NSS_MAP,
	NSS_PAM,
	NSS_PAMGROUP,
	NSS_PAMSESS
};

static ConfigDriver nss_cf_gen;

static ConfigTable nsscfg[] = {
	{ "nssov-ssd", "service> <url", 3, 3, 0, ARG_MAGIC|NSS_SSD,
		nss_cf_gen, "(OLcfgCtAt:3.1 NAME 'olcNssSsd' "
			"DESC 'URL for searches in a given service' "
			"EQUALITY caseIgnoreMatch "
			"SYNTAX OMsDirectoryString )", NULL, NULL },
	{ "nssov-map", "service> <orig> <new", 4, 4, 0, ARG_MAGIC|NSS_MAP,
		nss_cf_gen, "(OLcfgCtAt:3.2 NAME 'olcNssMap' "
			"DESC 'Map <service> lookups of <orig> attr to <new> attr' "
			"EQUALITY caseIgnoreMatch "
			"SYNTAX OMsDirectoryString )", NULL, NULL },
	{ "nssov-pam", "options", 2, 0, 0, ARG_MAGIC|NSS_PAM,
		nss_cf_gen, "(OLcfgCtAt:3.3 NAME 'olcNssPam' "
			"DESC 'PAM authentication and authorization options' "
			"EQUALITY caseIgnoreMatch "
			"SYNTAX OMsDirectoryString )", NULL, NULL },
	{ "nssov-pam-defhost", "hostname", 2, 2, 0, ARG_OFFSET|ARG_BERVAL,
		(void *)offsetof(struct nssov_info, ni_pam_defhost),
		"(OLcfgCtAt:3.4 NAME 'olcNssPamDefHost' "
			"DESC 'Default hostname for service checks' "
			"EQUALITY caseIgnoreMatch "
			"SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
	{ "nssov-pam-group-dn", "DN", 2, 2, 0, ARG_MAGIC|ARG_DN|NSS_PAMGROUP,
		nss_cf_gen, "(OLcfgCtAt:3.5 NAME 'olcNssPamGroupDN' "
			"DESC 'DN of group in which membership is required' "
			"EQUALITY distinguishedNameMatch "
			"SYNTAX OMsDN SINGLE-VALUE )", NULL, NULL },
	{ "nssov-pam-group-ad", "attr", 2, 2, 0, ARG_OFFSET|ARG_ATDESC,
		(void *)offsetof(struct nssov_info, ni_pam_group_ad),
		"(OLcfgCtAt:3.6 NAME 'olcNssPamGroupAD' "
			"DESC 'Member attribute to use for group check' "
			"EQUALITY caseIgnoreMatch "
			"SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
	{ "nssov-pam-min-uid", "uid", 2, 2, 0, ARG_OFFSET|ARG_INT,
		(void *)offsetof(struct nssov_info, ni_pam_min_uid),
		"(OLcfgCtAt:3.7 NAME 'olcNssPamMinUid' "
			"DESC 'Minimum UID allowed to login' "
			"EQUALITY integerMatch "
			"SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
	{ "nssov-pam-max-uid", "uid", 2, 2, 0, ARG_OFFSET|ARG_INT,
		(void *)offsetof(struct nssov_info, ni_pam_max_uid),
		"(OLcfgCtAt:3.8 NAME 'olcNssPamMaxUid' "
			"DESC 'Maximum UID allowed to login' "
			"EQUALITY integerMatch "
			"SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
	{ "nssov-pam-template-ad", "attr", 2, 2, 0, ARG_OFFSET|ARG_ATDESC,
		(void *)offsetof(struct nssov_info, ni_pam_template_ad),
		"(OLcfgCtAt:3.9 NAME 'olcNssPamTemplateAD' "
			"DESC 'Attribute to use for template login name' "
			"EQUALITY caseIgnoreMatch "
			"SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
	{ "nssov-pam-template", "name", 2, 2, 0, ARG_OFFSET|ARG_BERVAL,
		(void *)offsetof(struct nssov_info, ni_pam_template),
		"(OLcfgCtAt:3.10 NAME 'olcNssPamTemplate' "
			"DESC 'Default template login name' "
			"EQUALITY caseIgnoreMatch "
			"SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
	{ "nssov-pam-session", "service", 2, 2, 0, ARG_MAGIC|NSS_PAMSESS,
		nss_cf_gen, "(OLcfgCtAt:3.11 NAME 'olcNssPamSession' "
			"DESC 'Services for which sessions will be recorded' "
			"EQUALITY caseIgnoreMatch "
			"SYNTAX OMsDirectoryString )", NULL, NULL },
	{ "nssov-pam-password-prohibit-message",
		"password_prohibit_message", 2, 2, 0,
		ARG_OFFSET|ARG_BERVAL,
		(void *)offsetof(struct nssov_info, ni_pam_password_prohibit_message),
		"(OLcfgCtAt:3.12 NAME 'olcNssPamPwdProhibitMsg' "
			"DESC 'Prohibit password modification message' "
			"EQUALITY caseIgnoreMatch "
			"SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
	{ "nssov-pam-pwdmgr-dn",
		"pwdmgr_dn", 2, 2, 0,
		ARG_OFFSET|ARG_BERVAL,
		(void *)offsetof(struct nssov_info, ni_pam_pwdmgr_dn),
		"(OLcfgCtAt:3.13 NAME 'olcPamPwdmgrDn' "
			"DESC 'Password Manager DN' "
			"EQUALITY distinguishedNameMatch "
			"SYNTAX OMsDN SINGLE-VALUE )", NULL, NULL },
	{ "nssov-pam-pwdmgr-pwd",
		"pwdmgr_pwd", 2, 2, 0,
		ARG_OFFSET|ARG_BERVAL,
		(void *)offsetof(struct nssov_info, ni_pam_pwdmgr_pwd),
		"(OLcfgCtAt:3.14 NAME 'olcPamPwdmgrPwd' "
			"DESC 'Password Manager Pwd' "
			"EQUALITY octetStringMatch "
			"SYNTAX OMsOctetString SINGLE-VALUE )", NULL, NULL },
	{ NULL, NULL, 0,0,0, ARG_IGNORED }
};

static ConfigOCs nssocs[] = {
	{ "( OLcfgCtOc:3.1 "
		"NAME 'olcNssOvConfig' "
		"DESC 'NSS lookup configuration' "
		"SUP olcOverlayConfig "
		"MAY ( olcNssSsd $ olcNssMap $ olcNssPam $ olcNssPamDefHost $ "
			"olcNssPamGroupDN $ olcNssPamGroupAD $ "
			"olcNssPamMinUid $ olcNssPamMaxUid $ olcNssPamSession $ "
			"olcNssPamTemplateAD $ olcNssPamTemplate ) )",
		Cft_Overlay, nsscfg },
	{ NULL, 0, NULL }
};

static int
nss_cf_gen(ConfigArgs *c)
{
	slap_overinst *on = (slap_overinst *)c->bi;
	nssov_info *ni = on->on_bi.bi_private;
	nssov_mapinfo *mi;
	int i, j, rc = 0;
	slap_mask_t m;

	if ( c->op == SLAP_CONFIG_EMIT ) {
		switch(c->type) {
		case NSS_SSD:
			rc = 1;
			for (i=NM_alias;i<NM_NONE;i++) {
				struct berval scope;
				struct berval ssd;
				struct berval base;

				mi = &ni->ni_maps[i];

				/* ignore all-default services */
				if ( mi->mi_scope == LDAP_SCOPE_DEFAULT &&
					bvmatch( &mi->mi_filter, &mi->mi_filter0 ) &&
					BER_BVISNULL( &mi->mi_base ))
					continue;

				if ( BER_BVISNULL( &mi->mi_base ))
					base = ni->ni_db->be_nsuffix[0];
				else
					base = mi->mi_base;
				ldap_pvt_scope2bv(mi->mi_scope == LDAP_SCOPE_DEFAULT ?
					LDAP_SCOPE_SUBTREE : mi->mi_scope, &scope);
				ssd.bv_len = STRLENOF(" ldap:///???") + nss_svcs[i].word.bv_len +
					base.bv_len + scope.bv_len + mi->mi_filter.bv_len;
				ssd.bv_val = ch_malloc( ssd.bv_len + 1 );
				sprintf(ssd.bv_val, "%s ldap:///%s??%s?%s", nss_svcs[i].word.bv_val,
					base.bv_val, scope.bv_val, mi->mi_filter.bv_val );
				ber_bvarray_add( &c->rvalue_vals, &ssd );
				rc = 0;
			}
			break;
		case NSS_MAP:
			rc = 1;
			for (i=NM_alias;i<NM_NONE;i++) {

				mi = &ni->ni_maps[i];
				for (j=0;!BER_BVISNULL(&mi->mi_attrkeys[j]);j++) {
					if ( ber_bvstrcasecmp(&mi->mi_attrkeys[j],
						&mi->mi_attrs[j].an_name)) {
						struct berval map;

						map.bv_len = nss_svcs[i].word.bv_len +
							mi->mi_attrkeys[j].bv_len +
							mi->mi_attrs[j].an_desc->ad_cname.bv_len + 2;
						map.bv_val = ch_malloc(map.bv_len + 1);
						sprintf(map.bv_val, "%s %s %s", nss_svcs[i].word.bv_val,
							mi->mi_attrkeys[j].bv_val, mi->mi_attrs[j].an_desc->ad_cname.bv_val );
						ber_bvarray_add( &c->rvalue_vals, &map );
						rc = 0;
					}
				}
			}
			break;
		case NSS_PAM:
			rc = mask_to_verbs( pam_opts, ni->ni_pam_opts, &c->rvalue_vals );
			break;
		case NSS_PAMGROUP:
			if (!BER_BVISEMPTY( &ni->ni_pam_group_dn )) {
				value_add_one( &c->rvalue_vals, &ni->ni_pam_group_dn );
				value_add_one( &c->rvalue_nvals, &ni->ni_pam_group_dn );
			} else {
				rc = 1;
			}
			break;
		case NSS_PAMSESS:
			if (ni->ni_pam_sessions) {
				ber_bvarray_dup_x( &c->rvalue_vals, ni->ni_pam_sessions, NULL );
			} else {
				rc = 1;
			}
			break;
		}
		return rc;
	} else if ( c->op == LDAP_MOD_DELETE ) {
		/* FIXME */
		return 1;
	}
	switch( c->type ) {
	case NSS_SSD: {
		LDAPURLDesc *lud;

		i = verb_to_mask(c->argv[1], nss_svcs);
		if ( i == NM_NONE )
			return 1;

		mi = &ni->ni_maps[i];
		rc = ldap_url_parse(c->argv[2], &lud);
		if ( rc )
			return 1;
		do {
			struct berval base;
			/* Must be LDAP scheme */
			if (strcasecmp(lud->lud_scheme,"ldap")) {
				rc = 1;
				break;
			}
			/* Host part, attrs, and extensions must be empty */
			if (( lud->lud_host && *lud->lud_host ) ||
				lud->lud_attrs || lud->lud_exts ) {
				rc = 1;
				break;
			}
			ber_str2bv( lud->lud_dn,0,0,&base);
			rc = dnNormalize( 0,NULL,NULL,&base,&mi->mi_base,NULL);
			if ( rc )
				break;
			if ( lud->lud_filter ) {
				/* steal this */
				ber_str2bv( lud->lud_filter,0,0,&mi->mi_filter);
				lud->lud_filter = NULL;
			}
			mi->mi_scope = lud->lud_scope;
		} while(0);
		ldap_free_urldesc( lud );
		}
		break;
	case NSS_MAP:
		i = verb_to_mask(c->argv[1], nss_svcs);
		if ( i == NM_NONE )
			return 1;
		rc = 1;
		mi = &ni->ni_maps[i];
		for (j=0; !BER_BVISNULL(&mi->mi_attrkeys[j]); j++) {
			if (!strcasecmp(c->argv[2],mi->mi_attrkeys[j].bv_val)) {
				AttributeDescription *ad = NULL;
				const char *text;
				rc = slap_str2ad( c->argv[3], &ad, &text);
				if ( rc == 0 ) {
					mi->mi_attrs[j].an_desc = ad;
					mi->mi_attrs[j].an_name = ad->ad_cname;
				}
				break;
			}
		}
		break;
	case NSS_PAM:
		m = ni->ni_pam_opts;
		i = verbs_to_mask(c->argc, c->argv, pam_opts, &m);
		if (i == 0) {
			ni->ni_pam_opts = m;
			if ((m & NI_PAM_USERHOST) && !nssov_pam_host_ad) {
				const char *text;
				i = slap_str2ad("host", &nssov_pam_host_ad, &text);
				if (i != LDAP_SUCCESS) {
					snprintf(c->cr_msg, sizeof(c->cr_msg),
						"nssov: host attr unknown: %s", text);
					Debug(LDAP_DEBUG_ANY,"%s\n",c->cr_msg );
					rc = 1;
					break;
				}
			}
			if ((m & (NI_PAM_USERSVC|NI_PAM_HOSTSVC)) && !nssov_pam_svc_ad) {
				const char *text;
				i = slap_str2ad("authorizedService", &nssov_pam_svc_ad, &text);
				if (i != LDAP_SUCCESS) {
					snprintf(c->cr_msg, sizeof(c->cr_msg),
						"nssov: authorizedService attr unknown: %s", text);
					Debug(LDAP_DEBUG_ANY,"%s\n",c->cr_msg );
					rc = 1;
					break;
				}
			}
		} else {
			rc = 1;
		}
		break;
	case NSS_PAMGROUP:
		ni->ni_pam_group_dn = c->value_ndn;
		ch_free( c->value_dn.bv_val );
		break;
	case NSS_PAMSESS:
		ber_str2bv( c->argv[1], 0, 1, &c->value_bv );
		ber_bvarray_add( &ni->ni_pam_sessions, &c->value_bv );
		break;
	}
	return rc;
}

static int
nssov_db_init(
	BackendDB *be,
	ConfigReply *cr )
{
	slap_overinst *on = (slap_overinst *)be->bd_info;
	nssov_info *ni;
	int rc;

	rc = nssov_pam_init();
	if (rc) return rc;

	ni = ch_calloc( 1, sizeof(nssov_info) );
	on->on_bi.bi_private = ni;

	/* set up map keys */
	nssov_alias_init(ni);
	nssov_ether_init(ni);
	nssov_group_init(ni);
	nssov_host_init(ni);
	nssov_netgroup_init(ni);
	nssov_network_init(ni);
	nssov_passwd_init(ni);
	nssov_protocol_init(ni);
	nssov_rpc_init(ni);
	nssov_service_init(ni);
	nssov_shadow_init(ni);

	ni->ni_db = be->bd_self;
	ni->ni_pam_opts = NI_PAM_UID2DN;

	return 0;
}

static int
nssov_db_destroy(
	BackendDB *be,
	ConfigReply *cr )
{
	return 0;
}

static int
nssov_db_open(
	BackendDB *be,
	ConfigReply *cr )
{
	slap_overinst *on = (slap_overinst *)be->bd_info;
	nssov_info *ni = on->on_bi.bi_private;
	nssov_mapinfo *mi;

	int i, sock;
	struct sockaddr_un addr;

	/* Set default bases */
	for (i=0; i<NM_NONE; i++) {
		if ( BER_BVISNULL( &ni->ni_maps[i].mi_base )) {
			ber_dupbv( &ni->ni_maps[i].mi_base, &be->be_nsuffix[0] );
		}
		if ( ni->ni_maps[i].mi_scope == LDAP_SCOPE_DEFAULT )
			ni->ni_maps[i].mi_scope = LDAP_SCOPE_SUBTREE;
	}
	/* validate attribute maps */
	mi = ni->ni_maps;
	for ( i=0; i<NM_NONE; i++,mi++) {
		const char *text;
		int j;
		for (j=0; !BER_BVISNULL(&mi->mi_attrkeys[j]); j++) {
			/* skip attrs we already validated */
			if ( mi->mi_attrs[j].an_desc ) continue;
			if ( slap_bv2ad( &mi->mi_attrs[j].an_name,
				&mi->mi_attrs[j].an_desc, &text )) {
				Debug(LDAP_DEBUG_ANY,"nssov: invalid attr \"%s\": %s\n",
					mi->mi_attrs[j].an_name.bv_val, text );
				return -1;
			}
		}
		BER_BVZERO(&mi->mi_attrs[j].an_name);
		mi->mi_attrs[j].an_desc = NULL;
	}

	/* Find host and authorizedService definitions */
	if ((ni->ni_pam_opts & NI_PAM_USERHOST) && !nssov_pam_host_ad)
	{
		const char *text;
		i = slap_str2ad("host", &nssov_pam_host_ad, &text);
		if (i != LDAP_SUCCESS) {
			Debug(LDAP_DEBUG_ANY,"nssov: host attr unknown: %s\n",
				text );
			return -1;
		}
	}
	if ((ni->ni_pam_opts & (NI_PAM_USERSVC|NI_PAM_HOSTSVC)) &&
		!nssov_pam_svc_ad)
	{
		const char *text;
		i = slap_str2ad("authorizedService", &nssov_pam_svc_ad, &text);
		if (i != LDAP_SUCCESS) {
			Debug(LDAP_DEBUG_ANY,"nssov: authorizedService attr unknown: %s\n",
				text );
			return -1;
		}
	}
	if ( slapMode & SLAP_SERVER_MODE ) {
		char ebuf[128];
		/* make sure /var/run/nslcd exists */
		if (mkdir(NSLCD_PATH, (mode_t) 0555)) {
			int saved_errno = errno;
			Debug(LDAP_DEBUG_TRACE,"nssov: mkdir(%s) failed (ignored): %s\n",
					NSLCD_PATH, AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
		} else {
			Debug(LDAP_DEBUG_TRACE,"nssov: created %s\n",NSLCD_PATH );
		}

		/* create a socket */
		if ( (sock=socket(PF_UNIX,SOCK_STREAM,0))<0 )
		{
			int saved_errno = errno;
			Debug(LDAP_DEBUG_ANY,"nssov: cannot create socket: %s\n",
					AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			return -1;
		}
		/* remove existing named socket */
		if (unlink(NSLCD_SOCKET)<0)
		{
			int saved_errno = errno;
			Debug( LDAP_DEBUG_TRACE,"nssov: unlink() of "NSLCD_SOCKET" failed (ignored): %s\n",
							AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
		}
		/* create socket address structure */
		memset(&addr,0,sizeof(struct sockaddr_un));
		addr.sun_family=AF_UNIX;
		strncpy(addr.sun_path,NSLCD_SOCKET,sizeof(addr.sun_path));
		addr.sun_path[sizeof(addr.sun_path)-1]='\0';
		/* bind to the named socket */
		if (bind(sock,(struct sockaddr *)&addr,sizeof(struct sockaddr_un)))
		{
			int saved_errno = errno;
			Debug( LDAP_DEBUG_ANY,"nssov: bind() to "NSLCD_SOCKET" failed: %s",
				AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			if (close(sock)) {
				saved_errno = errno;
				Debug( LDAP_DEBUG_ANY,"nssov: problem closing socket: %s",
					AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			}
			return -1;
		}
		/* close the file descriptor on exit */
		if (fcntl(sock,F_SETFD,FD_CLOEXEC)<0)
		{
			int saved_errno = errno;
			Debug( LDAP_DEBUG_ANY,"nssov: fcntl(F_SETFL,O_NONBLOCK) failed: %s",
				AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			if (close(sock)) {
				saved_errno = errno;
				Debug( LDAP_DEBUG_ANY,"nssov: problem closing socket: %s",
					AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			}
			return -1;
		}
		/* set permissions of socket so anybody can do requests */
		/* Note: we use chmod() here instead of fchmod() because
			 fchmod does not work on sockets
			 http://www.opengroup.org/onlinepubs/009695399/functions/fchmod.html
			 http://lkml.org/lkml/2005/5/16/11 */
		if (chmod(NSLCD_SOCKET,(mode_t)0666))
		{
			int saved_errno = errno;
			Debug( LDAP_DEBUG_ANY,"nssov: chmod(0666) failed: %s",
				AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			if (close(sock)) {
				saved_errno = errno;
				Debug( LDAP_DEBUG_ANY,"nssov: problem closing socket: %s",
					AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			}
			return -1;
		}
		/* start listening for connections */
		if (listen(sock,SOMAXCONN)<0)
		{
			int saved_errno = errno;
			Debug( LDAP_DEBUG_ANY,"nssov: listen() failed: %s",
				AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			if (close(sock)) {
				saved_errno = errno;
				Debug( LDAP_DEBUG_ANY,"nssov: problem closing socket: %s",
					AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			}
			return -1;
		}
		ni->ni_socket = sock;
		ni->ni_conn = connection_client_setup( sock, acceptconn, ni );
	}

	return 0;
}

static int
nssov_db_close(
	BackendDB *be,
	ConfigReply *cr )
{
	slap_overinst *on = (slap_overinst *)be->bd_info;
	nssov_info *ni = on->on_bi.bi_private;

	if ( slapMode & SLAP_SERVER_MODE ) {
		char ebuf[128];
		/* close socket if it's still in use */
		if (ni->ni_socket >= 0)
		{
			if (close(ni->ni_socket)) {
				int saved_errno = errno;
				Debug( LDAP_DEBUG_ANY,"problem closing server socket (ignored): %s",
					AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
			}
			ni->ni_socket = -1;
		}
		/* remove existing named socket */
		if (unlink(NSLCD_SOCKET)<0)
		{
			int saved_errno = errno;
			Debug( LDAP_DEBUG_TRACE,"unlink() of "NSLCD_SOCKET" failed (ignored): %s",
				AC_STRERROR_R(saved_errno, ebuf, sizeof(ebuf)) );
		}
	}
	return 0;
}

static slap_overinst nssov;

int
nssov_initialize( void )
{
	int rc;

	nssov.on_bi.bi_type = "nssov";
	nssov.on_bi.bi_db_init = nssov_db_init;
	nssov.on_bi.bi_db_destroy = nssov_db_destroy;
	nssov.on_bi.bi_db_open = nssov_db_open;
	nssov.on_bi.bi_db_close = nssov_db_close;

	nssov.on_bi.bi_cf_ocs = nssocs;

	rc = config_register_schema( nsscfg, nssocs );
	if ( rc ) return rc;

	return overlay_register(&nssov);
}

#if SLAPD_OVER_NSSOV == SLAPD_MOD_DYNAMIC
int
init_module( int argc, char *argv[] )
{
	return nssov_initialize();
}
#endif
