301 lines
8.0 KiB
C
301 lines
8.0 KiB
C
/*
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* Copyright (c) 1995, 1996
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* Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Bill Paul.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: yppasswd_comm.c,v 1.10 1996/02/03 04:41:59 wpaul Exp $
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*/
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/*
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* This file contains a UNIX domain socket communications package
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* that lets a client process send pseudo-RPCs to rpc.yppasswdd
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* without using IP. This 'local-only' communications channel is
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* only used when the superuser runs passwd(1) or chpass(1) on
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* the NIS master server. The idea is that we want to grant the
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* superuser permission to perfom certain special operations, but
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* we need an iron-clad way to tell when we're receiving a request
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* from the superuser and when we aren't. To connect to a UNIX
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* domain socket, one needs to be able to access a file in the
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* filesystem. The socket created by rpc.yppasswdd is owned by
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* root and has all its permission bits cleared, so the only
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* user who can sucessfully connect() to it is root.
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*
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* It is the server's responsibility to initialize the listening
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* socket with the makeservsock() function and to add the socket to
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* the set of file descriptors monitored by the svc_run() loop.
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* Once this is done, calls made through the UNIX domain socket
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* can be handled almost exactly like a normal RPC. We even use
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* the XDR functions for serializing data between the client and
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* server to simplify the passing of complex data structures.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <err.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/fcntl.h>
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#include <rpc/rpc.h>
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#include <rpcsvc/yp.h>
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#include "yppasswd_comm.h"
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#include "yppasswd_private.h"
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#include "ypxfr_extern.h"
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#ifndef lint
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static const char rcsid[] = "$Id: yppasswd_comm.c,v 1.10 1996/02/03 04:41:59 wpaul Exp $";
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#endif
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char *sockname = "/var/run/ypsock";
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FILE *serv_fp;
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FILE *clnt_fp;
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int serv_sock;
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int clnt_sock;
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/*
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* serialize_data() and serialize_resp() are what really do most of
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* the work. These functions (ab)use xdrstdio_create() as the interface
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* to the XDR library. The RPC library uses xdrrec_create() and friends
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* for TCP based connections. I suppose we could use that here, but
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* the interface is a bit too complicated to justify using in an
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* applicatuion such as this. With xdrstdio_create(), the only catch
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* is that we need to provide a buffered file stream rather than
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* a simple socket descriptor, but we can easily turn the latter into
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* the former using fdopen(2).
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*
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* Doing things this way buys us the ability to change the form of
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* the data being exchanged without having to modify any of the
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* routines in this package.
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*/
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static int serialize_data(data, fp, op)
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struct master_yppasswd *data;
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FILE *fp;
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int op;
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{
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XDR xdrs;
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xdrstdio_create(&xdrs, fp, op);
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if (!xdr_master_yppasswd(&xdrs, data)) {
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xdr_destroy(&xdrs);
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return(1);
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}
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return(0);
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}
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static int serialize_resp(resp, fp, op)
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int *resp;
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FILE *fp;
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int op;
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{
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XDR xdrs;
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xdrstdio_create(&xdrs, fp, op);
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if (!xdr_int(&xdrs, resp)) {
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xdr_destroy(&xdrs);
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return(1);
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}
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return(0);
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}
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/*
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* Build the server's listening socket. The descriptor generated
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* here will be monitored for new connections by the svc_run() loop.
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*/
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int makeservsock()
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{
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static int ypsock;
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struct sockaddr_un us;
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int len;
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unlink(sockname);
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if ((ypsock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
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err(1, "failed to create UNIX domain socket");
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bzero((char *)&us, sizeof(us));
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us.sun_family = AF_UNIX;
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strcpy((char *)&us.sun_path, sockname);
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len = strlen(us.sun_path) + sizeof(us.sun_family) + 1;
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if (bind(ypsock, (struct sockaddr *)&us, len) == -1)
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err(1,"failed to bind UNIX domain socket");
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listen (ypsock, 1);
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return(ypsock);
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}
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/*
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* Create a socket for a client and try to connect() it to the
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* server.
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*/
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static int makeclntsock()
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{
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static int ypsock;
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struct sockaddr_un us;
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int len;
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if ((ypsock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
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warn("failed to create UNIX domain socket");
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return(-1);
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}
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bzero((char *)&us, sizeof(us));
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us.sun_family = AF_UNIX;
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strcpy((char *)&us.sun_path, sockname);
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len = strlen(us.sun_path) + sizeof(us.sun_family) + 1;
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if (connect(ypsock, (struct sockaddr *)&us, len) == -1) {
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warn("failed to connect to server");
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return(-1);
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}
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return(ypsock);
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}
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/*
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* This function is used by the server to accept a new connection
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* from a client and read its request data into a master_yppasswd
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* stucture.
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*/
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struct master_yppasswd *getdat(sock)
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int sock;
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{
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int len;
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struct sockaddr_un us;
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static struct master_yppasswd pw;
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struct timeval tv;
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(sock, &fds);
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tv.tv_sec = CONNECTION_TIMEOUT;
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tv.tv_usec = 0;
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switch(select(FD_SETSIZE, &fds, NULL, NULL, &tv)) {
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case 0:
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yp_error("select timed out");
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return(NULL);
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break;
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case -1:
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yp_error("select() failed: %s", strerror(errno));
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return(NULL);
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break;
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default:
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break;
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}
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if ((serv_sock = accept(sock, (struct sockaddr *)&us, &len)) == -1) {
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yp_error("accept failed: %s", strerror(errno));
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return(NULL);
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}
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if ((serv_fp = fdopen(serv_sock, "r+")) == NULL) {
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yp_error("fdopen failed: %s",strerror(errno));
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return(NULL);
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}
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if (serialize_data(&pw, serv_fp, XDR_DECODE)) {
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yp_error("failed to receive data");
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return(NULL);
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}
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return(&pw);
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}
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/*
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* Client uses this to read back a response code (a single
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* integer) from the server. Note that we don't need to implement
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* any special XDR function for this since an int is a base data
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* type which the XDR library can handle directly.
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*/
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int *getresp()
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{
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static int resp;
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if (serialize_resp(&resp, clnt_fp, XDR_DECODE)) {
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warn("failed to receive response");
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return(NULL);
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}
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fclose(clnt_fp);
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close(clnt_sock);
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return(&resp);
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}
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/*
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* Create a connection to the server and send a reqest
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* to be processed.
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*/
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int senddat(pw)
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struct master_yppasswd *pw;
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{
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if ((clnt_sock = makeclntsock()) == -1) {
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warn("failed to create socket");
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return(1);
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}
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if ((clnt_fp = fdopen(clnt_sock, "r+")) == NULL) {
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warn("fdopen failed");
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return(1);
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}
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if (serialize_data(pw, clnt_fp, XDR_ENCODE)) {
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warn("failed to send data");
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return(1);
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}
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return(0);
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}
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/*
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* This sends a response code back to the client.
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*/
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int sendresp(resp)
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int resp;
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{
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if (serialize_resp(&resp, serv_fp, XDR_ENCODE)) {
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yp_error("failed to send response");
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return(-1);
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}
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fclose(serv_fp);
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close(serv_sock);
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return(0);
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}
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