886 lines
22 KiB
C
886 lines
22 KiB
C
/*
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* Copyright (C) 1998 WIDE Project.
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* 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. Neither the name of the project nor the names of its 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 THE PROJECT 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 THE PROJECT 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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/*
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* Copyright (c) 1983, 1993, 1994
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* The Regents of the University of California. 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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* 4. Neither the name of the University nor the names of its 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 THE REGENTS 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 THE REGENTS 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/poll.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <alloca.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <ctype.h>
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#include <string.h>
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#include <libintl.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <sys/uio.h>
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#include "local.h"
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int __ivaliduser (FILE *, u_int32_t, const char *, const char *);
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static int __validuser2_sa (FILE *, struct sockaddr *, size_t,
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const char *, const char *, const char *);
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static int ruserok2_sa (struct sockaddr *ra, size_t ralen,
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int superuser, const char *ruser,
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const char *luser, const char *rhost);
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static int ruserok_sa (struct sockaddr *ra, size_t ralen,
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int superuser, const char *ruser,
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const char *luser);
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int iruserok_af (const void *raddr, int superuser, const char *ruser,
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const char *luser, sa_family_t af);
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int iruserok (u_int32_t raddr, int superuser, const char *ruser,
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const char *luser);
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libc_hidden_proto (iruserok_af)
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libc_freeres_ptr(static char *ahostbuf);
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int
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rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
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char **ahost;
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u_short rport;
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const char *locuser, *remuser, *cmd;
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int *fd2p;
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sa_family_t af;
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{
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char paddr[INET6_ADDRSTRLEN];
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struct addrinfo hints, *res, *ai;
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struct sockaddr_storage from;
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struct pollfd pfd[2];
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int32_t oldmask;
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pid_t pid;
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int s, lport, timo, error;
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char c;
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int refused;
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char num[8];
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ssize_t n;
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if (af != AF_INET && af != AF_INET6 && af != AF_UNSPEC)
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{
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__set_errno (EAFNOSUPPORT);
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return -1;
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}
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pid = __getpid();
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memset(&hints, '\0', sizeof(hints));
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hints.ai_flags = AI_CANONNAME;
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hints.ai_family = af;
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hints.ai_socktype = SOCK_STREAM;
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(void)snprintf(num, sizeof(num), "%d", ntohs(rport));
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error = getaddrinfo(*ahost, num, &hints, &res);
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if (error) {
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if (error == EAI_NONAME && *ahost != NULL) {
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf(stderr, L"%s: Unknown host\n",
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*ahost);
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else
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fprintf(stderr, "%s: Unknown host\n", *ahost);
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} else {
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf(stderr, L"rcmd: getaddrinfo: %s\n",
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gai_strerror(error));
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else
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fprintf(stderr, "rcmd: getaddrinfo: %s\n",
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gai_strerror(error));
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}
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return (-1);
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}
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pfd[0].events = POLLIN;
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pfd[1].events = POLLIN;
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if (res->ai_canonname){
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free (ahostbuf);
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ahostbuf = strdup (res->ai_canonname);
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if (ahostbuf == NULL) {
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf(stderr, L"%s",
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_("rcmd: Cannot allocate memory\n"));
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else
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fputs(_("rcmd: Cannot allocate memory\n"),
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stderr);
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return (-1);
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}
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*ahost = ahostbuf;
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} else
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*ahost = NULL;
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ai = res;
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refused = 0;
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oldmask = __sigblock(sigmask(SIGURG));
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for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
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char errbuf[200];
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s = rresvport_af(&lport, ai->ai_family);
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if (s < 0) {
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if (errno == EAGAIN) {
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf(stderr, L"%s",
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_("rcmd: socket: All ports in use\n"));
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else
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fputs(_("rcmd: socket: All ports in use\n"),
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stderr);
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} else {
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf(stderr,
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L"rcmd: socket: %m\n");
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else
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fprintf(stderr, "rcmd: socket: %m\n");
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}
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__sigsetmask(oldmask);
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freeaddrinfo(res);
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return -1;
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}
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__fcntl(s, F_SETOWN, pid);
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if (__connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
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break;
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(void)__close(s);
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if (errno == EADDRINUSE) {
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lport--;
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continue;
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}
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if (errno == ECONNREFUSED)
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refused = 1;
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if (ai->ai_next != NULL) {
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int oerrno = errno;
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char *buf = NULL;
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getnameinfo(ai->ai_addr, ai->ai_addrlen,
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paddr, sizeof(paddr),
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NULL, 0,
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NI_NUMERICHOST);
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if (__asprintf (&buf, _("connect to address %s: "),
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paddr) >= 0)
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{
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf(stderr, L"%s", buf);
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else
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fputs (buf, stderr);
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free (buf);
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}
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__set_errno (oerrno);
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perror(0);
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ai = ai->ai_next;
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getnameinfo(ai->ai_addr, ai->ai_addrlen,
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paddr, sizeof(paddr),
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NULL, 0,
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NI_NUMERICHOST);
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if (__asprintf (&buf, _("Trying %s...\n"), paddr) >= 0)
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{
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf (stderr, L"%s", buf);
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else
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fputs (buf, stderr);
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free (buf);
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}
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continue;
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}
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if (refused && timo <= 16) {
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(void)sleep(timo);
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timo *= 2;
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ai = res;
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refused = 0;
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continue;
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}
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freeaddrinfo(res);
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if (_IO_fwide (stderr, 0) > 0)
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(void)__fwprintf(stderr, L"%s: %s\n", *ahost,
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strerror_r(errno,
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errbuf, sizeof (errbuf)));
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else
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(void)fprintf(stderr, "%s: %s\n", *ahost,
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strerror_r(errno,
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errbuf, sizeof (errbuf)));
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__sigsetmask(oldmask);
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return -1;
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}
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lport--;
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if (fd2p == 0) {
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__write(s, "", 1);
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lport = 0;
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} else {
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char num[8];
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int s2 = rresvport_af(&lport, ai->ai_family), s3;
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socklen_t len = ai->ai_addrlen;
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if (s2 < 0)
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goto bad;
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listen(s2, 1);
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(void)snprintf(num, sizeof(num), "%d", lport);
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if (__write(s, num, strlen(num)+1) != (ssize_t)strlen(num)+1) {
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char *buf = NULL;
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if (__asprintf (&buf, _("\
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rcmd: write (setting up stderr): %m\n")) >= 0)
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{
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf(stderr, L"%s", buf);
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else
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fputs (buf, stderr);
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free (buf);
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}
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(void)__close(s2);
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goto bad;
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}
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pfd[0].fd = s;
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pfd[1].fd = s2;
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__set_errno (0);
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if (__poll (pfd, 2, -1) < 1 || (pfd[1].revents & POLLIN) == 0){
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char *buf = NULL;
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if ((errno != 0
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&& __asprintf(&buf, _("\
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rcmd: poll (setting up stderr): %m\n")) >= 0)
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|| (errno == 0
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&& __asprintf(&buf, _("\
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poll: protocol failure in circuit setup\n")) >= 0))
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{
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf (stderr, L"%s", buf);
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else
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fputs (buf, stderr);
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free (buf);
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}
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(void)__close(s2);
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goto bad;
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}
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s3 = TEMP_FAILURE_RETRY (accept(s2, (struct sockaddr *)&from,
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&len));
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switch (from.ss_family) {
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case AF_INET:
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rport = ntohs(((struct sockaddr_in *)&from)->sin_port);
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break;
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case AF_INET6:
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rport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
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break;
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default:
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rport = 0;
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break;
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}
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(void)__close(s2);
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if (s3 < 0) {
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if (_IO_fwide (stderr, 0) > 0)
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(void)__fwprintf(stderr,
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L"rcmd: accept: %m\n");
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else
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(void)fprintf(stderr,
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"rcmd: accept: %m\n");
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lport = 0;
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goto bad;
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}
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*fd2p = s3;
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if (rport >= IPPORT_RESERVED || rport < IPPORT_RESERVED / 2){
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char *buf = NULL;
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if (__asprintf(&buf, _("\
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socket: protocol failure in circuit setup\n")) >= 0)
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{
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf (stderr, L"%s", buf);
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else
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fputs (buf, stderr);
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free (buf);
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}
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goto bad2;
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}
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}
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struct iovec iov[3] =
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{
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[0] = { .iov_base = (void *) locuser,
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.iov_len = strlen (locuser) + 1 },
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[1] = { .iov_base = (void *) remuser,
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.iov_len = strlen (remuser) + 1 },
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[2] = { .iov_base = (void *) cmd,
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.iov_len = strlen (cmd) + 1 }
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};
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(void) TEMP_FAILURE_RETRY (writev (s, iov, 3));
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n = TEMP_FAILURE_RETRY (read(s, &c, 1));
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if (n != 1) {
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char *buf = NULL;
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if ((n == 0
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&& asprintf(&buf, _("rcmd: %s: short read"),
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*ahost) >= 0)
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|| (n != 0
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&& asprintf(&buf, "rcmd: %s: %m\n", *ahost) >= 0))
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{
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf (stderr, L"%s", buf);
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else
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fputs (buf, stderr);
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free (buf);
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}
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goto bad2;
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}
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if (c != 0) {
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while (__read(s, &c, 1) == 1) {
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(void)__write(STDERR_FILENO, &c, 1);
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if (c == '\n')
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break;
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}
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goto bad2;
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}
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__sigsetmask(oldmask);
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freeaddrinfo(res);
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return s;
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bad2:
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if (lport)
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(void)__close(*fd2p);
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bad:
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(void)__close(s);
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__sigsetmask(oldmask);
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freeaddrinfo(res);
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return -1;
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}
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libc_hidden_def (rcmd_af)
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int
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rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
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char **ahost;
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u_short rport;
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const char *locuser, *remuser, *cmd;
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int *fd2p;
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{
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return rcmd_af (ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
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}
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int
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rresvport_af(alport, family)
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int *alport;
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sa_family_t family;
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{
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struct sockaddr_storage ss;
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int s;
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size_t len;
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uint16_t *sport;
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switch(family){
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case AF_INET:
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len = sizeof(struct sockaddr_in);
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sport = &((struct sockaddr_in *)&ss)->sin_port;
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break;
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case AF_INET6:
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len = sizeof(struct sockaddr_in6);
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sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
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break;
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default:
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__set_errno (EAFNOSUPPORT);
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return -1;
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}
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s = __socket(family, SOCK_STREAM, 0);
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if (s < 0)
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return -1;
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memset (&ss, '\0', sizeof(ss));
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#ifdef SALEN
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ss.__ss_len = len;
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#endif
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ss.ss_family = family;
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/* Ignore invalid values. */
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if (*alport < IPPORT_RESERVED / 2)
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*alport = IPPORT_RESERVED / 2;
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else if (*alport >= IPPORT_RESERVED)
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*alport = IPPORT_RESERVED - 1;
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int start = *alport;
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do {
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*sport = htons((uint16_t) *alport);
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if (__bind(s, (struct sockaddr *)&ss, len) >= 0)
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return s;
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if (errno != EADDRINUSE) {
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(void)__close(s);
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return -1;
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}
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if ((*alport)-- == IPPORT_RESERVED/2)
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*alport = IPPORT_RESERVED - 1;
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} while (*alport != start);
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(void)__close(s);
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__set_errno (EAGAIN);
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return -1;
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}
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libc_hidden_def (rresvport_af)
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int
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rresvport(alport)
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int *alport;
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{
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return rresvport_af(alport, AF_INET);
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}
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int __check_rhosts_file = 1;
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char *__rcmd_errstr;
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int
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ruserok_af(rhost, superuser, ruser, luser, af)
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const char *rhost, *ruser, *luser;
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int superuser;
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sa_family_t af;
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{
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struct addrinfo hints, *res, *res0;
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int gai;
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int ret;
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memset (&hints, '\0', sizeof(hints));
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hints.ai_family = af;
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gai = getaddrinfo(rhost, NULL, &hints, &res0);
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if (gai)
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return -1;
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ret = -1;
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for (res=res0; res; res=res->ai_next)
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if (ruserok2_sa(res->ai_addr, res->ai_addrlen,
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superuser, ruser, luser, rhost) == 0){
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ret = 0;
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break;
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}
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freeaddrinfo(res0);
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return (ret);
|
|
}
|
|
libc_hidden_def (ruserok_af)
|
|
|
|
int
|
|
ruserok(rhost, superuser, ruser, luser)
|
|
const char *rhost, *ruser, *luser;
|
|
int superuser;
|
|
{
|
|
return ruserok_af(rhost, superuser, ruser, luser, AF_INET);
|
|
}
|
|
|
|
/* Extremely paranoid file open function. */
|
|
static FILE *
|
|
iruserfopen (const char *file, uid_t okuser)
|
|
{
|
|
struct stat64 st;
|
|
char *cp = NULL;
|
|
FILE *res = NULL;
|
|
|
|
/* If not a regular file, if owned by someone other than user or
|
|
root, if writeable by anyone but the owner, or if hardlinked
|
|
anywhere, quit. */
|
|
cp = NULL;
|
|
if (__lxstat64 (_STAT_VER, file, &st))
|
|
cp = _("lstat failed");
|
|
else if (!S_ISREG (st.st_mode))
|
|
cp = _("not regular file");
|
|
else
|
|
{
|
|
res = fopen (file, "rc");
|
|
if (!res)
|
|
cp = _("cannot open");
|
|
else if (__fxstat64 (_STAT_VER, fileno (res), &st) < 0)
|
|
cp = _("fstat failed");
|
|
else if (st.st_uid && st.st_uid != okuser)
|
|
cp = _("bad owner");
|
|
else if (st.st_mode & (S_IWGRP|S_IWOTH))
|
|
cp = _("writeable by other than owner");
|
|
else if (st.st_nlink > 1)
|
|
cp = _("hard linked somewhere");
|
|
}
|
|
|
|
/* If there were any problems, quit. */
|
|
if (cp != NULL)
|
|
{
|
|
__rcmd_errstr = cp;
|
|
if (res)
|
|
fclose (res);
|
|
return NULL;
|
|
}
|
|
|
|
/* No threads use this stream. */
|
|
__fsetlocking (res, FSETLOCKING_BYCALLER);
|
|
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* New .rhosts strategy: We are passed an ip address. We spin through
|
|
* hosts.equiv and .rhosts looking for a match. When the .rhosts only
|
|
* has ip addresses, we don't have to trust a nameserver. When it
|
|
* contains hostnames, we spin through the list of addresses the nameserver
|
|
* gives us and look for a match.
|
|
*
|
|
* Returns 0 if ok, -1 if not ok.
|
|
*/
|
|
static int
|
|
ruserok2_sa (ra, ralen, superuser, ruser, luser, rhost)
|
|
struct sockaddr *ra;
|
|
size_t ralen;
|
|
int superuser;
|
|
const char *ruser, *luser, *rhost;
|
|
{
|
|
FILE *hostf = NULL;
|
|
int isbad = -1;
|
|
|
|
if (!superuser)
|
|
hostf = iruserfopen (_PATH_HEQUIV, 0);
|
|
|
|
if (hostf)
|
|
{
|
|
isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
|
|
fclose (hostf);
|
|
|
|
if (!isbad)
|
|
return 0;
|
|
}
|
|
|
|
if (__check_rhosts_file || superuser)
|
|
{
|
|
char *pbuf;
|
|
struct passwd pwdbuf, *pwd;
|
|
size_t dirlen;
|
|
size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
|
|
char *buffer = __alloca (buflen);
|
|
uid_t uid;
|
|
|
|
if (__getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) != 0
|
|
|| pwd == NULL)
|
|
return -1;
|
|
|
|
dirlen = strlen (pwd->pw_dir);
|
|
pbuf = alloca (dirlen + sizeof "/.rhosts");
|
|
__mempcpy (__mempcpy (pbuf, pwd->pw_dir, dirlen),
|
|
"/.rhosts", sizeof "/.rhosts");
|
|
|
|
/* Change effective uid while reading .rhosts. If root and
|
|
reading an NFS mounted file system, can't read files that
|
|
are protected read/write owner only. */
|
|
uid = __geteuid ();
|
|
seteuid (pwd->pw_uid);
|
|
hostf = iruserfopen (pbuf, pwd->pw_uid);
|
|
|
|
if (hostf != NULL)
|
|
{
|
|
isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
|
|
fclose (hostf);
|
|
}
|
|
|
|
seteuid (uid);
|
|
return isbad;
|
|
}
|
|
return -1;
|
|
}
|
|
/*
|
|
* ruserok_sa() is now discussed on ipng, so
|
|
* currently disabled for external use
|
|
*/
|
|
static int ruserok_sa(ra, ralen, superuser, ruser, luser)
|
|
struct sockaddr *ra;
|
|
size_t ralen;
|
|
int superuser;
|
|
const char *ruser, *luser;
|
|
{
|
|
return ruserok2_sa(ra, ralen, superuser, ruser, luser, "-");
|
|
}
|
|
|
|
/* This is the exported version. */
|
|
int
|
|
iruserok_af (raddr, superuser, ruser, luser, af)
|
|
const void *raddr;
|
|
int superuser;
|
|
const char *ruser, *luser;
|
|
sa_family_t af;
|
|
{
|
|
struct sockaddr_storage ra;
|
|
size_t ralen;
|
|
|
|
memset (&ra, '\0', sizeof(ra));
|
|
switch (af){
|
|
case AF_INET:
|
|
((struct sockaddr_in *)&ra)->sin_family = AF_INET;
|
|
memcpy (&(((struct sockaddr_in *)&ra)->sin_addr), raddr,
|
|
sizeof(struct in_addr));
|
|
ralen = sizeof(struct sockaddr_in);
|
|
break;
|
|
case AF_INET6:
|
|
((struct sockaddr_in6 *)&ra)->sin6_family = AF_INET6;
|
|
memcpy (&(((struct sockaddr_in6 *)&ra)->sin6_addr), raddr,
|
|
sizeof(struct in6_addr));
|
|
ralen = sizeof(struct sockaddr_in6);
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
return ruserok_sa ((struct sockaddr *)&ra, ralen, superuser, ruser, luser);
|
|
}
|
|
libc_hidden_def (iruserok_af)
|
|
|
|
int
|
|
iruserok (raddr, superuser, ruser, luser)
|
|
u_int32_t raddr;
|
|
int superuser;
|
|
const char *ruser, *luser;
|
|
{
|
|
return iruserok_af (&raddr, superuser, ruser, luser, AF_INET);
|
|
}
|
|
|
|
/*
|
|
* XXX
|
|
* Don't make static, used by lpd(8).
|
|
*
|
|
* This function is not used anymore. It is only present because lpd(8)
|
|
* calls it (!?!). We simply call __invaliduser2() with an illegal rhost
|
|
* argument. This means that netgroups won't work in .rhost/hosts.equiv
|
|
* files. If you want lpd to work with netgroups, fix lpd to use ruserok()
|
|
* or PAM.
|
|
* Returns 0 if ok, -1 if not ok.
|
|
*/
|
|
int
|
|
__ivaliduser(hostf, raddr, luser, ruser)
|
|
FILE *hostf;
|
|
u_int32_t raddr;
|
|
const char *luser, *ruser;
|
|
{
|
|
struct sockaddr_in ra;
|
|
memset(&ra, '\0', sizeof(ra));
|
|
ra.sin_family = AF_INET;
|
|
ra.sin_addr.s_addr = raddr;
|
|
return __validuser2_sa(hostf, (struct sockaddr *)&ra, sizeof(ra),
|
|
luser, ruser, "-");
|
|
}
|
|
|
|
|
|
/* Returns 1 on positive match, 0 on no match, -1 on negative match. */
|
|
static int
|
|
internal_function
|
|
__checkhost_sa (struct sockaddr *ra, size_t ralen, char *lhost,
|
|
const char *rhost)
|
|
{
|
|
struct addrinfo hints, *res0, *res;
|
|
char raddr[INET6_ADDRSTRLEN];
|
|
int match;
|
|
int negate=1; /* Multiply return with this to get -1 instead of 1 */
|
|
|
|
/* Check nis netgroup. */
|
|
if (strncmp ("+@", lhost, 2) == 0)
|
|
return innetgr (&lhost[2], rhost, NULL, NULL);
|
|
|
|
if (strncmp ("-@", lhost, 2) == 0)
|
|
return -innetgr (&lhost[2], rhost, NULL, NULL);
|
|
|
|
/* -host */
|
|
if (strncmp ("-", lhost,1) == 0) {
|
|
negate = -1;
|
|
lhost++;
|
|
} else if (strcmp ("+",lhost) == 0) {
|
|
return 1; /* asking for trouble, but ok.. */
|
|
}
|
|
|
|
/* Try for raw ip address first. */
|
|
/* XXX */
|
|
if (getnameinfo(ra, ralen,
|
|
raddr, sizeof(raddr), NULL, 0,
|
|
NI_NUMERICHOST) == 0
|
|
&& strcmp(raddr, lhost) == 0)
|
|
return negate;
|
|
|
|
/* Better be a hostname. */
|
|
match = 0;
|
|
memset(&hints, '\0', sizeof(hints));
|
|
hints.ai_family = ra->sa_family;
|
|
if (getaddrinfo(lhost, NULL, &hints, &res0) == 0){
|
|
/* Spin through ip addresses. */
|
|
for (res = res0; res; res = res->ai_next)
|
|
{
|
|
if (res->ai_family == ra->sa_family
|
|
&& !memcmp(res->ai_addr, ra, res->ai_addrlen))
|
|
{
|
|
match = 1;
|
|
break;
|
|
}
|
|
}
|
|
freeaddrinfo (res0);
|
|
}
|
|
return negate * match;
|
|
}
|
|
|
|
/* Returns 1 on positive match, 0 on no match, -1 on negative match. */
|
|
static int
|
|
internal_function
|
|
__icheckuser (const char *luser, const char *ruser)
|
|
{
|
|
/*
|
|
luser is user entry from .rhosts/hosts.equiv file
|
|
ruser is user id on remote host
|
|
*/
|
|
|
|
/* [-+]@netgroup */
|
|
if (strncmp ("+@", luser, 2) == 0)
|
|
return innetgr (&luser[2], NULL, ruser, NULL);
|
|
|
|
if (strncmp ("-@", luser,2) == 0)
|
|
return -innetgr (&luser[2], NULL, ruser, NULL);
|
|
|
|
/* -user */
|
|
if (strncmp ("-", luser, 1) == 0)
|
|
return -(strcmp (&luser[1], ruser) == 0);
|
|
|
|
/* + */
|
|
if (strcmp ("+", luser) == 0)
|
|
return 1;
|
|
|
|
/* simple string match */
|
|
return strcmp (ruser, luser) == 0;
|
|
}
|
|
|
|
/*
|
|
* Returns 1 for blank lines (or only comment lines) and 0 otherwise
|
|
*/
|
|
static int
|
|
__isempty (char *p)
|
|
{
|
|
while (*p && isspace (*p)) {
|
|
++p;
|
|
}
|
|
|
|
return (*p == '\0' || *p == '#') ? 1 : 0 ;
|
|
}
|
|
|
|
/*
|
|
* Returns 0 if positive match, -1 if _not_ ok.
|
|
*/
|
|
static int
|
|
__validuser2_sa(hostf, ra, ralen, luser, ruser, rhost)
|
|
FILE *hostf;
|
|
struct sockaddr *ra;
|
|
size_t ralen;
|
|
const char *luser, *ruser, *rhost;
|
|
{
|
|
register const char *user;
|
|
register char *p;
|
|
int hcheck, ucheck;
|
|
char *buf = NULL;
|
|
size_t bufsize = 0;
|
|
int retval = -1;
|
|
|
|
while (__getline (&buf, &bufsize, hostf) > 0) {
|
|
buf[bufsize - 1] = '\0'; /* Make sure it's terminated. */
|
|
p = buf;
|
|
|
|
/* Skip empty or comment lines */
|
|
if (__isempty (p)) {
|
|
continue;
|
|
}
|
|
|
|
for (;*p && !isspace(*p); ++p) {
|
|
*p = _tolower (*p);
|
|
}
|
|
|
|
/* Next we want to find the permitted name for the remote user. */
|
|
if (*p == ' ' || *p == '\t') {
|
|
/* <nul> terminate hostname and skip spaces */
|
|
for (*p++='\0'; *p && isspace (*p); ++p);
|
|
|
|
user = p; /* this is the user's name */
|
|
while (*p && !isspace (*p))
|
|
++p; /* find end of user's name */
|
|
} else
|
|
user = p;
|
|
|
|
*p = '\0'; /* <nul> terminate username (+host?) */
|
|
|
|
/* buf -> host(?) ; user -> username(?) */
|
|
|
|
/* First check host part */
|
|
hcheck = __checkhost_sa (ra, ralen, buf, rhost);
|
|
|
|
if (hcheck < 0)
|
|
break;
|
|
|
|
if (hcheck) {
|
|
/* Then check user part */
|
|
if (! (*user))
|
|
user = luser;
|
|
|
|
ucheck = __icheckuser (user, ruser);
|
|
|
|
/* Positive 'host user' match? */
|
|
if (ucheck > 0) {
|
|
retval = 0;
|
|
break;
|
|
}
|
|
|
|
/* Negative 'host -user' match? */
|
|
if (ucheck < 0)
|
|
break;
|
|
|
|
/* Neither, go on looking for match */
|
|
}
|
|
}
|
|
|
|
if (buf != NULL)
|
|
free (buf);
|
|
|
|
return retval;
|
|
}
|