288 lines
7.7 KiB
C
288 lines
7.7 KiB
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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifdef HAVE_CONFIG_H
|
||
|
|
#include <config.h>
|
||
|
|
RCSID("$Id: iruserok.c,v 1.23 1999/12/05 13:27:05 assar Exp $");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <ctype.h>
|
||
|
|
#ifdef HAVE_SYS_TYPES_H
|
||
|
|
#include <sys/types.h>
|
||
|
|
#endif
|
||
|
|
#ifdef HAVE_NETINET_IN_H
|
||
|
|
#include <netinet/in.h>
|
||
|
|
#endif
|
||
|
|
#ifdef HAVE_NETINET_IN6_H
|
||
|
|
#include <netinet/in6.h>
|
||
|
|
#endif
|
||
|
|
#ifdef HAVE_NETINET6_IN6_H
|
||
|
|
#include <netinet6/in6.h>
|
||
|
|
#endif
|
||
|
|
#ifdef HAVE_RPCSVC_YPCLNT_H
|
||
|
|
#include <rpcsvc/ypclnt.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "roken.h"
|
||
|
|
|
||
|
|
int __check_rhosts_file = 1;
|
||
|
|
char *__rcmd_errstr = 0;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Returns "true" if match, 0 if no match.
|
||
|
|
*/
|
||
|
|
static
|
||
|
|
int
|
||
|
|
__icheckhost(unsigned raddr, const char *lhost)
|
||
|
|
{
|
||
|
|
struct hostent *hp;
|
||
|
|
u_long laddr;
|
||
|
|
char **pp;
|
||
|
|
|
||
|
|
/* Try for raw ip address first. */
|
||
|
|
if (isdigit((unsigned char)*lhost)
|
||
|
|
&& (long)(laddr = inet_addr(lhost)) != -1)
|
||
|
|
return (raddr == laddr);
|
||
|
|
|
||
|
|
/* Better be a hostname. */
|
||
|
|
if ((hp = gethostbyname(lhost)) == NULL)
|
||
|
|
return (0);
|
||
|
|
|
||
|
|
/* Spin through ip addresses. */
|
||
|
|
for (pp = hp->h_addr_list; *pp; ++pp)
|
||
|
|
if (memcmp(&raddr, *pp, sizeof(u_long)) == 0)
|
||
|
|
return (1);
|
||
|
|
|
||
|
|
/* No match. */
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Returns 0 if ok, -1 if not ok.
|
||
|
|
*/
|
||
|
|
static
|
||
|
|
int
|
||
|
|
__ivaliduser(FILE *hostf, unsigned raddr, const char *luser,
|
||
|
|
const char *ruser)
|
||
|
|
{
|
||
|
|
char *user, *p;
|
||
|
|
int ch;
|
||
|
|
char buf[MaxHostNameLen + 128]; /* host + login */
|
||
|
|
char hname[MaxHostNameLen];
|
||
|
|
struct hostent *hp;
|
||
|
|
/* Presumed guilty until proven innocent. */
|
||
|
|
int userok = 0, hostok = 0;
|
||
|
|
#ifdef HAVE_YP_GET_DEFAULT_DOMAIN
|
||
|
|
char *ypdomain;
|
||
|
|
|
||
|
|
if (yp_get_default_domain(&ypdomain))
|
||
|
|
ypdomain = NULL;
|
||
|
|
#else
|
||
|
|
#define ypdomain NULL
|
||
|
|
#endif
|
||
|
|
/* We need to get the damn hostname back for netgroup matching. */
|
||
|
|
if ((hp = gethostbyaddr((char *)&raddr,
|
||
|
|
sizeof(u_long),
|
||
|
|
AF_INET)) == NULL)
|
||
|
|
return (-1);
|
||
|
|
strlcpy(hname, hp->h_name, sizeof(hname));
|
||
|
|
|
||
|
|
while (fgets(buf, sizeof(buf), hostf)) {
|
||
|
|
p = buf;
|
||
|
|
/* Skip lines that are too long. */
|
||
|
|
if (strchr(p, '\n') == NULL) {
|
||
|
|
while ((ch = getc(hostf)) != '\n' && ch != EOF);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (*p == '\n' || *p == '#') {
|
||
|
|
/* comment... */
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
|
||
|
|
if (isupper((unsigned char)*p))
|
||
|
|
*p = tolower((unsigned char)*p);
|
||
|
|
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';
|
||
|
|
/*
|
||
|
|
* Do +/- and +@/-@ checking. This looks really nasty,
|
||
|
|
* but it matches SunOS's behavior so far as I can tell.
|
||
|
|
*/
|
||
|
|
switch(buf[0]) {
|
||
|
|
case '+':
|
||
|
|
if (!buf[1]) { /* '+' matches all hosts */
|
||
|
|
hostok = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (buf[1] == '@') /* match a host by netgroup */
|
||
|
|
hostok = innetgr((char *)&buf[2],
|
||
|
|
(char *)&hname, NULL, ypdomain);
|
||
|
|
else /* match a host by addr */
|
||
|
|
hostok = __icheckhost(raddr,(char *)&buf[1]);
|
||
|
|
break;
|
||
|
|
case '-': /* reject '-' hosts and all their users */
|
||
|
|
if (buf[1] == '@') {
|
||
|
|
if (innetgr((char *)&buf[2],
|
||
|
|
(char *)&hname, NULL, ypdomain))
|
||
|
|
return(-1);
|
||
|
|
} else {
|
||
|
|
if (__icheckhost(raddr,(char *)&buf[1]))
|
||
|
|
return(-1);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default: /* if no '+' or '-', do a simple match */
|
||
|
|
hostok = __icheckhost(raddr, buf);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
switch(*user) {
|
||
|
|
case '+':
|
||
|
|
if (!*(user+1)) { /* '+' matches all users */
|
||
|
|
userok = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (*(user+1) == '@') /* match a user by netgroup */
|
||
|
|
userok = innetgr(user+2, NULL, (char *)ruser,
|
||
|
|
ypdomain);
|
||
|
|
else /* match a user by direct specification */
|
||
|
|
userok = !(strcmp(ruser, user+1));
|
||
|
|
break;
|
||
|
|
case '-': /* if we matched a hostname, */
|
||
|
|
if (hostok) { /* check for user field rejections */
|
||
|
|
if (!*(user+1))
|
||
|
|
return(-1);
|
||
|
|
if (*(user+1) == '@') {
|
||
|
|
if (innetgr(user+2, NULL,
|
||
|
|
(char *)ruser, ypdomain))
|
||
|
|
return(-1);
|
||
|
|
} else {
|
||
|
|
if (!strcmp(ruser, user+1))
|
||
|
|
return(-1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default: /* no rejections: try to match the user */
|
||
|
|
if (hostok)
|
||
|
|
userok = !(strcmp(ruser,*user ? user : luser));
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (hostok && userok)
|
||
|
|
return(0);
|
||
|
|
}
|
||
|
|
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(unsigned raddr, int superuser, const char *ruser, const char *luser)
|
||
|
|
{
|
||
|
|
char *cp;
|
||
|
|
struct stat sbuf;
|
||
|
|
struct passwd *pwd;
|
||
|
|
FILE *hostf;
|
||
|
|
uid_t uid;
|
||
|
|
int first;
|
||
|
|
char pbuf[MaxPathLen];
|
||
|
|
|
||
|
|
first = 1;
|
||
|
|
hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
|
||
|
|
again:
|
||
|
|
if (hostf) {
|
||
|
|
if (__ivaliduser(hostf, raddr, luser, ruser) == 0) {
|
||
|
|
fclose(hostf);
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
fclose(hostf);
|
||
|
|
}
|
||
|
|
if (first == 1 && (__check_rhosts_file || superuser)) {
|
||
|
|
first = 0;
|
||
|
|
if ((pwd = k_getpwnam((char*)luser)) == NULL)
|
||
|
|
return (-1);
|
||
|
|
snprintf (pbuf, sizeof(pbuf), "%s/.rhosts", pwd->pw_dir);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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 = geteuid();
|
||
|
|
seteuid(pwd->pw_uid);
|
||
|
|
hostf = fopen(pbuf, "r");
|
||
|
|
seteuid(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 (lstat(pbuf, &sbuf) < 0)
|
||
|
|
cp = ".rhosts lstat failed";
|
||
|
|
else if (!S_ISREG(sbuf.st_mode))
|
||
|
|
cp = ".rhosts not regular file";
|
||
|
|
else if (fstat(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 = cp;
|
||
|
|
fclose(hostf);
|
||
|
|
return (-1);
|
||
|
|
}
|
||
|
|
goto again;
|
||
|
|
}
|
||
|
|
return (-1);
|
||
|
|
}
|