text: /*-
   * Copyright (c) 2002 Networks Associates Technology, Inc.
   * All rights reserved.
   *
   * This software was developed for the FreeBSD Project by ThinkSec AS and
   * NAI Labs, the Security Research Division of Network Associates, Inc.
   * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
   * DARPA CHATS research program.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote
   *    products derived from this software without specific prior written
   *    permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * $FreeBSD: src/lib/libypclnt/ypclnt_passwd.c,v 1.7 2006/07/28 21:34:37 stefanf Exp $
   */
  
  #include <sys/types.h>
  #include <sys/socket.h>
  #include <netinet/in.h>
  
  #include <err.h>
  #include <errno.h>
  #include <netconfig.h>
  #include <netdb.h>
  #include <pwd.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  #include <rpcsvc/ypclnt.h>
  #include <rpcsvc/yppasswd.h>
  
  #include "ypclnt.h"
  #include "yppasswd_private.h"
  
  static int yppasswd_remote(ypclnt_t *, const struct passwd *, const char *);
  static int yppasswd_local(ypclnt_t *, const struct passwd *);
  
  /*
   * Determines the availability of rpc.yppasswdd.  Returns -1 for not
   * available (or unable to determine), 0 for available, 1 for available in
   * master mode.
   */
  int
  ypclnt_havepasswdd(ypclnt_t *ypclnt)
  {
  	struct netconfig *nc = NULL;
  	void *localhandle = NULL;
  	CLIENT *clnt = NULL;
  	int ret;
  
  	/* check if rpc.yppasswdd is running */
  	if (getrpcport(ypclnt->server, YPPASSWDPROG,
  		YPPASSWDPROC_UPDATE, IPPROTO_UDP) == 0) {
  		ypclnt_error(ypclnt, __func__, "no rpc.yppasswdd on server");
  		return (-1);
  	}
  
  	/* if we're not root, use remote method */
  	if (getuid() != 0)
  		return (0);
  
  	/* try to connect to rpc.yppasswdd */
  	localhandle = setnetconfig();
  	while ((nc = getnetconfig(localhandle)) != NULL) {
  		if (nc->nc_protofmly != NULL &&
  			strcmp(nc->nc_protofmly, NC_LOOPBACK) == 0)
  				break;
  	}
  	if (nc == NULL) {
  		ypclnt_error(ypclnt, __func__,
  		    "getnetconfig: %s", nc_sperror());
  		ret = 0;
  		goto done;
  	}
  	if ((clnt = clnt_tp_create(NULL, MASTER_YPPASSWDPROG,
  	    MASTER_YPPASSWDVERS, nc)) == NULL) {
  		ypclnt_error(ypclnt, __func__,
  		    "failed to connect to rpc.yppasswdd: %s",
  		    clnt_spcreateerror(ypclnt->server));
  		ret = 0;
  		goto done;
  	} else
  		ret = 1;
  
  done:
  	if (clnt != NULL) {
  		clnt_destroy(clnt);
  	}
  	endnetconfig(localhandle);
  	return (ret);
  }
  
  /*
   * Updates the NIS user information for the specified user.
   */
  int
  ypclnt_passwd(ypclnt_t *ypclnt, const struct passwd *pwd, const char *passwd)
  {
  	switch (ypclnt_havepasswdd(ypclnt)) {
  	case 0:
  		return (yppasswd_remote(ypclnt, pwd, passwd));
  	case 1:
  		return (yppasswd_local(ypclnt, pwd));
  	default:
  		return (-1);
  	}
  }
  
  /*
   * yppasswd_remote and yppasswd_local are quite similar but still
   * sufficiently different that merging them into one makes the code
   * significantly less readable, IMHO, so we keep them separate.
   */
  
  static int
  yppasswd_local(ypclnt_t *ypclnt, const struct passwd *pwd)
  {
  	struct master_yppasswd yppwd;
  	struct rpc_err rpcerr;
  	struct netconfig *nc = NULL;
  	void *localhandle = NULL;
  	CLIENT *clnt = NULL;
  	int ret, *result;
  
  	/* fill the master_yppasswd structure */
  	memset(&yppwd, 0, sizeof yppwd);
  	yppwd.newpw.pw_uid = pwd->pw_uid;
  	yppwd.newpw.pw_gid = pwd->pw_gid;
  	yppwd.newpw.pw_change = pwd->pw_change;
  	yppwd.newpw.pw_expire = pwd->pw_expire;
  	yppwd.newpw.pw_fields = pwd->pw_fields;
  	yppwd.oldpass = strdup("");
  	yppwd.domain = strdup(ypclnt->domain);
  	if ((yppwd.newpw.pw_name = strdup(pwd->pw_name)) == NULL ||
  	    (yppwd.newpw.pw_passwd = strdup(pwd->pw_passwd)) == NULL ||
  	    (yppwd.newpw.pw_class = strdup(pwd->pw_class)) == NULL ||
  	    (yppwd.newpw.pw_gecos = strdup(pwd->pw_gecos)) == NULL ||
  	    (yppwd.newpw.pw_dir = strdup(pwd->pw_dir)) == NULL ||
  	    (yppwd.newpw.pw_shell = strdup(pwd->pw_shell)) == NULL) {
  		ypclnt_error(ypclnt, __func__, strerror(errno));
  		ret = -1;
  		goto done;
  	}
  
  	/* connect to rpc.yppasswdd */
  	localhandle = setnetconfig();
  	while ((nc = getnetconfig(localhandle)) != NULL) {
  		if (nc->nc_protofmly != NULL &&
  		    strcmp(nc->nc_protofmly, NC_LOOPBACK) == 0)
  			break;
  	}
  	if (nc == NULL) {
  		ypclnt_error(ypclnt, __func__,
  		    "getnetconfig: %s", nc_sperror());
  		ret = -1;
  		goto done;
  	}
  	if ((clnt = clnt_tp_create(NULL, MASTER_YPPASSWDPROG,
  	    MASTER_YPPASSWDVERS, nc)) == NULL) {
  		ypclnt_error(ypclnt, __func__,
  		    "failed to connect to rpc.yppasswdd: %s",
  		    clnt_spcreateerror(ypclnt->server));
  		ret = -1;
  		goto done;
  	}
  	clnt->cl_auth = authunix_create_default();
  
  	/* request the update */
  	result = yppasswdproc_update_master_1(&yppwd, clnt);
  
  	/* check for RPC errors */
  	clnt_geterr(clnt, &rpcerr);
  	if (rpcerr.re_status != RPC_SUCCESS) {
  		ypclnt_error(ypclnt, __func__,
  		    "NIS password update failed: %s",
  		    clnt_sperror(clnt, ypclnt->server));
  		ret = -1;
  		goto done;
  	}
  
  	/* check the result of the update */
  	if (result == NULL || *result != 0) {
  		ypclnt_error(ypclnt, __func__,
  		    "NIS password update failed");
  		/* XXX how do we get more details? */
  		ret = -1;
  		goto done;
  	}
  
  	ypclnt_error(ypclnt, NULL, NULL);
  	ret = 0;
  
   done:
  	if (clnt != NULL) {
  		auth_destroy(clnt->cl_auth);
  		clnt_destroy(clnt);
  	}
  	endnetconfig(localhandle);
  	free(yppwd.newpw.pw_name);
  	if (yppwd.newpw.pw_passwd != NULL) {
  		memset(yppwd.newpw.pw_passwd, 0, strlen(yppwd.newpw.pw_passwd));
  		free(yppwd.newpw.pw_passwd);
  	}
  	free(yppwd.newpw.pw_class);
  	free(yppwd.newpw.pw_gecos);
  	free(yppwd.newpw.pw_dir);
  	free(yppwd.newpw.pw_shell);
  	if (yppwd.oldpass != NULL) {
  		memset(yppwd.oldpass, 0, strlen(yppwd.oldpass));
  		free(yppwd.oldpass);
  	}
  	return (ret);
  }
  
  static int
  yppasswd_remote(ypclnt_t *ypclnt, const struct passwd *pwd, const char *passwd)
  {
  	struct yppasswd yppwd;
  	struct rpc_err rpcerr;
  	CLIENT *clnt = NULL;
  	int ret, *result;
  
  	/* fill the yppasswd structure */
  	memset(&yppwd, 0, sizeof yppwd);
  	yppwd.newpw.pw_uid = pwd->pw_uid;
  	yppwd.newpw.pw_gid = pwd->pw_gid;
  	if ((yppwd.newpw.pw_name = strdup(pwd->pw_name)) == NULL ||
  	    (yppwd.newpw.pw_passwd = strdup(pwd->pw_passwd)) == NULL ||
  	    (yppwd.newpw.pw_gecos = strdup(pwd->pw_gecos)) == NULL ||
  	    (yppwd.newpw.pw_dir = strdup(pwd->pw_dir)) == NULL ||
  	    (yppwd.newpw.pw_shell = strdup(pwd->pw_shell)) == NULL ||
  	    (yppwd.oldpass = strdup(passwd ? passwd : "")) == NULL) {
  		ypclnt_error(ypclnt, __func__, strerror(errno));
  		ret = -1;
  		goto done;
  	}
  
  	/* connect to rpc.yppasswdd */
  	clnt = clnt_create(ypclnt->server, YPPASSWDPROG, YPPASSWDVERS, "udp");
  	if (clnt == NULL) {
  		ypclnt_error(ypclnt, __func__,
  		    "failed to connect to rpc.yppasswdd: %s",
  		    clnt_spcreateerror(ypclnt->server));
  		ret = -1;
  		goto done;
  	}
  	clnt->cl_auth = authunix_create_default();
  
  	/* request the update */
  	result = yppasswdproc_update_1(&yppwd, clnt);
  
  	/* check for RPC errors */
  	clnt_geterr(clnt, &rpcerr);
  	if (rpcerr.re_status != RPC_SUCCESS) {
  		ypclnt_error(ypclnt, __func__,
  		    "NIS password update failed: %s",
  		    clnt_sperror(clnt, ypclnt->server));
  		ret = -1;
  		goto done;
  	}
  
  	/* check the result of the update */
  	if (result == NULL || *result != 0) {
  		ypclnt_error(ypclnt, __func__,
  		    "NIS password update failed");
  		/* XXX how do we get more details? */
  		ret = -1;
  		goto done;
  	}
  
  	ypclnt_error(ypclnt, NULL, NULL);
  	ret = 0;
  
   done:
  	if (clnt != NULL) {
  		auth_destroy(clnt->cl_auth);
  		clnt_destroy(clnt);
  	}
  	free(yppwd.newpw.pw_name);
  	if (yppwd.newpw.pw_passwd != NULL) {
  		memset(yppwd.newpw.pw_passwd, 0, strlen(yppwd.newpw.pw_passwd));
  		free(yppwd.newpw.pw_passwd);
  	}
  	free(yppwd.newpw.pw_gecos);
  	free(yppwd.newpw.pw_dir);
  	free(yppwd.newpw.pw_shell);
  	if (yppwd.oldpass != NULL) {
  		memset(yppwd.oldpass, 0, strlen(yppwd.oldpass));
  		free(yppwd.oldpass);
  	}
  	return (ret);
  }
  