271 lines
6.9 KiB
C
271 lines
6.9 KiB
C
/* Based on the rcmd.c.new file distributed with linux libc 5.4.19
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Adapted to inetutils by Bernhard Rosenkraenzer <bero@startrek.in-trier.de>
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Note that a lot in this file is superfluous; hopefully it won't be a
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problem for systems that need it for iruserok &c.... */
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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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* 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 the University of
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* California, Berkeley and its contributors.
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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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#include "winsup.h"
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#include <pwd.h>
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#include <sys/stat.h>
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#include <malloc.h>
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#include <string.h>
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#include <netdb.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <time.h>
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#ifndef PATH_HEQUIV
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# define PATH_HEQUIV "/etc/hosts.equiv"
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#endif
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int __check_rhosts_file = 1;
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const char *__rcmd_errstr;
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/*
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* Returns "true" if match, 0 if no match.
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*/
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static int
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__icheckhost(raddr, lhost)
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u_long raddr;
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register char *lhost;
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{
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register struct hostent *hp;
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register u_long laddr;
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register char **pp;
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/* Try for raw ip address first. */
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if (isdigit(*lhost) && (long)(laddr = cygwin_inet_addr(lhost)) != -1)
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return (raddr == laddr);
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/* Better be a hostname. */
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if ((hp = cygwin_gethostbyname(lhost)) == NULL)
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return (0);
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/* Spin through ip addresses. */
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for (pp = hp->h_addr_list; *pp; ++pp)
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if (!bcmp(&raddr, *pp, sizeof(u_long)))
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return (1);
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/* No match. */
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return (0);
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}
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/*
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* XXX
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* Don't make static, used by lpd(8).
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*
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* Returns 0 if ok, -1 if not ok.
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*/
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static int
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__ivaliduser(hostf, raddr, luser, ruser)
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struct __sFILE64 *hostf;
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u_long raddr;
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const char *luser;
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const char *ruser;
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{
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size_t buf_offs = 0;
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size_t buf_len = 256;
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char *buf = malloc (buf_len);
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if (! buf)
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return -1;
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while (fgets(buf + buf_offs, buf_len - buf_offs, hostf)) {
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/*int ch;*/
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register char *user, *p;
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if (strchr(buf + buf_offs, '\n') == NULL) {
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/* No newline yet, read some more. */
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buf_offs += strlen (buf + buf_offs);
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if (buf_offs >= buf_len - 1) {
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/* Make more room in BUF. */
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char *new_buf;
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buf_len += buf_len;
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new_buf = realloc (buf, buf_len);
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if (! new_buf) {
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free (buf);
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return -1;
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}
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buf = new_buf;
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}
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continue;
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}
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buf_offs = 0; /* Start at beginning next time around. */
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p = buf;
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while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
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/* *p = isupper(*p) ? tolower(*p) : *p; -- Uli */
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*p = tolower(*p); /* works for linux libc */
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p++;
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}
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if (*p == ' ' || *p == '\t') {
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*p++ = '\0';
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while (*p == ' ' || *p == '\t')
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p++;
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user = p;
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while (*p != '\n' && *p != ' ' &&
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*p != '\t' && *p != '\0')
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p++;
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} else
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user = p;
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*p = '\0';
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if (__icheckhost(raddr, buf) && !strcmp(ruser, *user ? user : luser)) {
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free (buf);
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return (0);
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}
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}
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free (buf);
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return (-1);
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}
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/*
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* New .rhosts strategy: We are passed an ip address. We spin through
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* hosts.equiv and .rhosts looking for a match. When the .rhosts only
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* has ip addresses, we don't have to trust a nameserver. When it
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* contains hostnames, we spin through the list of addresses the nameserver
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* gives us and look for a match.
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*
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* Returns 0 if ok, -1 if not ok.
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*/
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int
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iruserok(raddr, superuser, ruser, luser)
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u_long raddr;
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int superuser;
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const char *ruser;
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const char *luser;
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{
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register const char *cp;
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struct __stat64 sbuf;
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struct passwd *pwd;
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struct __sFILE64 *hostf;
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uid_t uid;
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int first = 1;
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char *pbuf;
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first = 1;
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hostf = superuser ? NULL : fopen64(PATH_HEQUIV, "rt");
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again:
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if (hostf) {
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if (__ivaliduser(hostf, raddr, luser, ruser) == 0) {
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(void) fclose(hostf);
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return(0);
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}
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(void) fclose(hostf);
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}
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if (first == 1 && (__check_rhosts_file || superuser)) {
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first = 0;
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if ((pwd = getpwnam(luser)) == NULL)
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return(-1);
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pbuf = malloc (strlen (pwd->pw_dir) + sizeof "/.rhosts");
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if (! pbuf)
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{
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errno = ENOMEM;
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return -1;
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}
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strcpy (pbuf, pwd->pw_dir);
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strcat (pbuf, "/.rhosts");
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/*
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* Change effective uid while opening .rhosts. If root and
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* reading an NFS mounted file system, can't read files that
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* are protected read/write owner only.
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*/
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uid = geteuid32();
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(void)seteuid32(pwd->pw_uid);
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hostf = fopen64(pbuf, "rt");
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(void)seteuid32(uid);
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if (hostf == NULL)
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return(-1);
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/*
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* If not a regular file, or is owned by someone other than
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* user or root or if writeable by anyone but the owner, quit.
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*/
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cp = NULL;
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if (lstat64(pbuf, &sbuf) < 0)
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cp = ".rhosts not regular file";
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else if (!S_ISREG(sbuf.st_mode))
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cp = ".rhosts not regular file";
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else if (fstat64(fileno(hostf), &sbuf) < 0)
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cp = ".rhosts fstat failed";
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else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
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cp = "bad .rhosts owner";
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else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
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cp = ".rhosts writeable by other than owner";
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/* If there were any problems, quit. */
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if (cp) {
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__rcmd_errstr = (char *) cp;
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fclose(hostf);
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return(-1);
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}
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goto again;
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}
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return (-1);
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}
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int
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ruserok(rhost, superuser, ruser, luser)
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const char *rhost;
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int superuser;
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const char *ruser;
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const char *luser;
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{
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struct hostent *hp;
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u_long addr;
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char **ap;
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if ((hp = cygwin_gethostbyname(rhost)) == NULL)
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return (-1);
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for (ap = hp->h_addr_list; *ap; ++ap) {
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bcopy(*ap, &addr, sizeof(addr));
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if (iruserok(addr, superuser, ruser, luser) == 0)
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return (0);
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}
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return (-1);
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}
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