newlib/winsup/cygwin/libc/iruserok.c

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/* Based on the rcmd.c.new file distributed with linux libc 5.4.19
Adapted to inetutils by Bernhard Rosenkraenzer <bero@startrek.in-trier.de>
Note that a lot in this file is superfluous; hopefully it won't be a
problem for systems that need it for iruserok &c.... */
/*
* Copyright (c) 1983, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
#include "winsup.h"
#include <pwd.h>
#include <sys/stat.h>
#include <malloc.h>
#include <string.h>
#include <netdb.h>
#include <ctype.h>
#include <stdio.h>
#include <errno.h>
#include <sys/time.h>
#include <time.h>
#ifndef PATH_HEQUIV
# define PATH_HEQUIV "/etc/hosts.equiv"
#endif
int __check_rhosts_file = 1;
const char *__rcmd_errstr;
/*
* Returns "true" if match, 0 if no match.
*/
static int
__icheckhost(raddr, lhost)
u_long raddr;
register char *lhost;
{
register struct hostent *hp;
register u_long laddr;
register char **pp;
/* Try for raw ip address first. */
if (isdigit(*lhost) && (long)(laddr = cygwin_inet_addr(lhost)) != -1)
return (raddr == laddr);
/* Better be a hostname. */
if ((hp = cygwin_gethostbyname(lhost)) == NULL)
return (0);
/* Spin through ip addresses. */
for (pp = hp->h_addr_list; *pp; ++pp)
if (!bcmp(&raddr, *pp, sizeof(u_long)))
return (1);
/* No match. */
return (0);
}
/*
* XXX
* Don't make static, used by lpd(8).
*
* Returns 0 if ok, -1 if not ok.
*/
static int
__ivaliduser(hostf, raddr, luser, ruser)
struct __sFILE64 *hostf;
u_long raddr;
const char *luser;
const char *ruser;
{
size_t buf_offs = 0;
size_t buf_len = 256;
char *buf = malloc (buf_len);
if (! buf)
return -1;
while (fgets(buf + buf_offs, buf_len - buf_offs, hostf)) {
/*int ch;*/
register char *user, *p;
if (strchr(buf + buf_offs, '\n') == NULL) {
/* No newline yet, read some more. */
buf_offs += strlen (buf + buf_offs);
if (buf_offs >= buf_len - 1) {
/* Make more room in BUF. */
char *new_buf;
buf_len += buf_len;
new_buf = realloc (buf, buf_len);
if (! new_buf) {
free (buf);
return -1;
}
buf = new_buf;
}
continue;
}
buf_offs = 0; /* Start at beginning next time around. */
p = buf;
while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
/* *p = isupper(*p) ? tolower(*p) : *p; -- Uli */
*p = tolower(*p); /* works for linux libc */
p++;
}
if (*p == ' ' || *p == '\t') {
*p++ = '\0';
while (*p == ' ' || *p == '\t')
p++;
user = p;
while (*p != '\n' && *p != ' ' &&
*p != '\t' && *p != '\0')
p++;
} else
user = p;
*p = '\0';
if (__icheckhost(raddr, buf) && !strcmp(ruser, *user ? user : luser)) {
free (buf);
return (0);
}
}
free (buf);
return (-1);
}
/*
* 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.
*/
int
iruserok(raddr, superuser, ruser, luser)
u_long raddr;
int superuser;
const char *ruser;
const char *luser;
{
register const char *cp;
struct __stat64 sbuf;
struct passwd *pwd;
struct __sFILE64 *hostf;
uid_t uid;
int first = 1;
char *pbuf;
first = 1;
hostf = superuser ? NULL : fopen64(PATH_HEQUIV, "rt");
again:
if (hostf) {
if (__ivaliduser(hostf, raddr, luser, ruser) == 0) {
(void) fclose(hostf);
return(0);
}
(void) fclose(hostf);
}
if (first == 1 && (__check_rhosts_file || superuser)) {
first = 0;
if ((pwd = getpwnam(luser)) == NULL)
return(-1);
pbuf = malloc (strlen (pwd->pw_dir) + sizeof "/.rhosts");
if (! pbuf)
{
errno = ENOMEM;
return -1;
}
strcpy (pbuf, pwd->pw_dir);
strcat (pbuf, "/.rhosts");
/*
* Change effective uid while opening .rhosts. If root and
* reading an NFS mounted file system, can't read files that
* are protected read/write owner only.
*/
uid = geteuid32();
(void)seteuid32(pwd->pw_uid);
hostf = fopen64(pbuf, "rt");
(void)seteuid32(uid);
if (hostf == NULL)
return(-1);
/*
* If not a regular file, or is owned by someone other than
* user or root or if writeable by anyone but the owner, quit.
*/
cp = NULL;
if (lstat64(pbuf, &sbuf) < 0)
cp = ".rhosts not regular file";
else if (!S_ISREG(sbuf.st_mode))
cp = ".rhosts not regular file";
else if (fstat64(fileno(hostf), &sbuf) < 0)
cp = ".rhosts fstat failed";
else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
cp = "bad .rhosts owner";
else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
cp = ".rhosts writeable by other than owner";
/* If there were any problems, quit. */
if (cp) {
__rcmd_errstr = (char *) cp;
fclose(hostf);
return(-1);
}
goto again;
}
return (-1);
}
int
ruserok(rhost, superuser, ruser, luser)
const char *rhost;
int superuser;
const char *ruser;
const char *luser;
{
struct hostent *hp;
u_long addr;
char **ap;
if ((hp = cygwin_gethostbyname(rhost)) == NULL)
return (-1);
for (ap = hp->h_addr_list; *ap; ++ap) {
bcopy(*ap, &addr, sizeof(addr));
if (iruserok(addr, superuser, ruser, luser) == 0)
return (0);
}
return (-1);
}