ae77177087
several new kerberos related libraries and applications to FreeBSD: o kgetcred(1) allows one to manually get a ticket for a particular service. o kf(1) securily forwards ticket to another host through an authenticated and encrypted stream. o kcc(1) is an umbrella program around klist(1), kswitch(1), kgetcred(1) and other user kerberos operations. klist and kswitch are just symlinks to kcc(1) now. o kswitch(1) allows you to easily switch between kerberos credentials if you're running KCM. o hxtool(1) is a certificate management tool to use with PKINIT. o string2key(1) maps a password into key. o kdigest(8) is a userland tool to access the KDC's digest interface. o kimpersonate(8) creates a "fake" ticket for a service. We also now install manpages for some lirbaries that were not installed before, libheimntlm and libhx509. - The new HEIMDAL version no longer supports Kerberos 4. All users are recommended to switch to Kerberos 5. - Weak ciphers are now disabled by default. To enable DES support (used by telnet(8)), use "allow_weak_crypto" option in krb5.conf. - libtelnet, pam_ksu and pam_krb5 are now compiled with error on warnings disabled due to the function they use (krb5_get_err_text(3)) being deprecated. I plan to work on this next. - Heimdal's KDC now require sqlite to operate. We use the bundled version and install it as libheimsqlite. If some other FreeBSD components will require it in the future we can rename it to libbsdsqlite and use for these components as well. - This is not a latest Heimdal version, the new one was released while I was working on the update. I will update it to 1.5.2 soon, as it fixes some important bugs and security issues.
282 lines
7.5 KiB
C
282 lines
7.5 KiB
C
/*
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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. 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 <config.h>
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#include <stdio.h>
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#include <ctype.h>
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_NETINET_IN6_H
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#include <netinet/in6.h>
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#endif
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#ifdef HAVE_NETINET6_IN6_H
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#include <netinet6/in6.h>
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#endif
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#ifdef HAVE_RPCSVC_YPCLNT_H
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#include <rpcsvc/ypclnt.h>
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#endif
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#include "roken.h"
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int __check_rhosts_file = 1;
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char *__rcmd_errstr = 0;
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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
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int
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__icheckhost(unsigned raddr, const char *lhost)
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{
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struct hostent *hp;
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u_long laddr;
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char **pp;
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/* Try for raw ip address first. */
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if (isdigit((unsigned char)*lhost)
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&& (long)(laddr = 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 = 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 (memcmp(&raddr, *pp, sizeof(u_long)) == 0)
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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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* Returns 0 if ok, -1 if not ok.
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*/
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static
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int
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__ivaliduser(FILE *hostf, unsigned raddr, const char *luser,
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const char *ruser)
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{
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char *user, *p;
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int ch;
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char buf[MaxHostNameLen + 128]; /* host + login */
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char hname[MaxHostNameLen];
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struct hostent *hp;
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/* Presumed guilty until proven innocent. */
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int userok = 0, hostok = 0;
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#ifdef HAVE_YP_GET_DEFAULT_DOMAIN
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char *ypdomain;
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if (yp_get_default_domain(&ypdomain))
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ypdomain = NULL;
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#else
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#define ypdomain NULL
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#endif
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/* We need to get the damn hostname back for netgroup matching. */
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if ((hp = gethostbyaddr((char *)&raddr,
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sizeof(u_long),
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AF_INET)) == NULL)
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return (-1);
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strlcpy(hname, hp->h_name, sizeof(hname));
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while (fgets(buf, sizeof(buf), hostf)) {
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p = buf;
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/* Skip lines that are too long. */
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if (strchr(p, '\n') == NULL) {
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while ((ch = getc(hostf)) != '\n' && ch != EOF);
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continue;
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}
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if (*p == '\n' || *p == '#') {
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/* comment... */
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continue;
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}
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while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
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if (isupper((unsigned char)*p))
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*p = tolower((unsigned char)*p);
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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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/*
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* Do +/- and +@/-@ checking. This looks really nasty,
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* but it matches SunOS's behavior so far as I can tell.
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*/
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switch(buf[0]) {
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case '+':
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if (!buf[1]) { /* '+' matches all hosts */
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hostok = 1;
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break;
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}
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if (buf[1] == '@') /* match a host by netgroup */
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hostok = innetgr((char *)&buf[2],
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(char *)&hname, NULL, ypdomain);
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else /* match a host by addr */
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hostok = __icheckhost(raddr,(char *)&buf[1]);
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break;
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case '-': /* reject '-' hosts and all their users */
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if (buf[1] == '@') {
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if (innetgr((char *)&buf[2],
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(char *)&hname, NULL, ypdomain))
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return(-1);
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} else {
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if (__icheckhost(raddr,(char *)&buf[1]))
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return(-1);
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}
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break;
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default: /* if no '+' or '-', do a simple match */
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hostok = __icheckhost(raddr, buf);
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break;
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}
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switch(*user) {
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case '+':
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if (!*(user+1)) { /* '+' matches all users */
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userok = 1;
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break;
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}
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if (*(user+1) == '@') /* match a user by netgroup */
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userok = innetgr(user+2, NULL, (char *)ruser,
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ypdomain);
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else /* match a user by direct specification */
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userok = !(strcmp(ruser, user+1));
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break;
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case '-': /* if we matched a hostname, */
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if (hostok) { /* check for user field rejections */
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if (!*(user+1))
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return(-1);
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if (*(user+1) == '@') {
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if (innetgr(user+2, NULL,
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(char *)ruser, ypdomain))
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return(-1);
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} else {
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if (!strcmp(ruser, user+1))
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return(-1);
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}
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}
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break;
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default: /* no rejections: try to match the user */
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if (hostok)
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userok = !(strcmp(ruser,*user ? user : luser));
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break;
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}
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if (hostok && userok)
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return(0);
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}
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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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ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
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iruserok(unsigned raddr, int superuser, const char *ruser, const char *luser)
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{
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char *cp;
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struct stat sbuf;
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struct passwd *pwd;
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FILE *hostf;
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uid_t uid;
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int first;
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char pbuf[MaxPathLen];
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first = 1;
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hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
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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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fclose(hostf);
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return (0);
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}
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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 = k_getpwnam((char*)luser)) == NULL)
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return (-1);
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snprintf (pbuf, sizeof(pbuf), "%s/.rhosts", pwd->pw_dir);
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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 = geteuid();
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if (seteuid(pwd->pw_uid) < 0)
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return (-1);
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hostf = fopen(pbuf, "r");
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seteuid(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 (lstat(pbuf, &sbuf) < 0)
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cp = ".rhosts lstat failed";
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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 (fstat(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 = 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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