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Added iruserok()

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@379 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Björn Groenvall
1996-03-28 15:03:53 +00:00
parent d8a3c6c198
commit 39edde375e
1 changed files with 247 additions and 1 deletions
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248
lib/roken/iruserok.c
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@@ -1,3 +1,36 @@
/*
* 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 "bsd_locl.h"
RCSID("$Id$");
@@ -7,14 +40,227 @@ RCSID("$Id$");
int __check_rhosts_file = 1;
char *__rcmd_errstr = 0;
/*
* Returns "true" if match, 0 if no match.
*/
static
int
__icheckhost(u_int32_t raddr, const char *lhost)
{
register struct hostent *hp;
register u_long laddr;
register char **pp;
/* Try for raw ip address first. */
if (isdigit(*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 (!bcmp(&raddr, *pp, sizeof(u_long)))
return (1);
/* No match. */
return (0);
}
/*
* Returns 0 if ok, -1 if not ok.
*/
static
int
__ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser)
{
register 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);
strcpy(hname, hp->h_name);
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') {
*p = isupper(*p) ? tolower(*p) : *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, 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,
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(u_int32_t raddr, int superuser, const char *ruser, const char *luser)
{
return -1;
register 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) {
(void)fclose(hostf);
return (0);
}
(void)fclose(hostf);
}
if (first == 1 && (__check_rhosts_file || superuser)) {
first = 0;
if ((pwd = getpwnam(luser)) == NULL)
return (-1);
(void)strcpy(pbuf, pwd->pw_dir);
(void)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 = geteuid();
(void)seteuid(pwd->pw_uid);
hostf = fopen(pbuf, "r");
(void)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;
(void)fclose(hostf);
return (-1);
}
goto again;
}
return (-1);
}
#endif /* !HAVE_IRUSEROK */