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|
/*----------------------------------------------------------------------
* Modified for Linux-PAM by Al Longyear <longyear@netcom.com> 96/5/5
* Modifications, Cristian Gafton 97/2/8
* Modifications, Peter Allgeyer 97/3
* Modifications (netgroups and fixes), Nicolai Langfeldt 97/3/21
* Security fix: 97/10/2 - gethostbyname called repeatedly without care
* Modification (added privategroup option) Andrew <morgan@transmeta.com>
*----------------------------------------------------------------------
* 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.
*/
#define _BSD_SOURCE
#define USER_RHOSTS_FILE "/.rhosts" /* prefixed by user's home dir */
#ifdef linux
#include <endian.h>
#endif
#include <sys/types.h>
#include <sys/uio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h> /* This is supposed(?) to contain the following */
int innetgr(const char *, const char *, const char *,const char *);
#include <stdio.h>
#include <errno.h>
#include <sys/time.h>
#include <arpa/inet.h>
#ifndef MAXDNAME
#define MAXDNAME 256
#endif
#include <stdarg.h>
#include <ctype.h>
#include <net/if.h>
#ifdef linux
# include <linux/sockios.h>
# ifndef __USE_MISC
# define __USE_MISC
# include <sys/fsuid.h>
# endif /* __USE_MISC */
#endif
#include <pwd.h>
#include <grp.h>
#include <sys/file.h>
#include <sys/signal.h>
#include <sys/stat.h>
#include <syslog.h>
#ifndef _PATH_HEQUIV
#define _PATH_HEQUIV "/etc/hosts.equiv"
#endif /* _PATH_HEQUIV */
#define PAM_SM_AUTH /* only defines this management group */
#include <security/pam_modules.h>
#include <security/_pam_macros.h>
/* to the best of my knowledge, all modern UNIX boxes have 32 bit integers */
#define U32 unsigned int
/*
* Options for this module
*/
struct _options {
int opt_no_hosts_equiv;
int opt_no_rhosts;
int opt_debug;
int opt_nowarn;
int opt_disallow_null_authtok;
int opt_silent;
int opt_promiscuous;
int opt_suppress;
int opt_private_group;
const char *last_error;
};
/* logging */
static void _pam_log(int err, const char *format, ...)
{
va_list args;
va_start(args, format);
openlog("pam_rhosts_auth", LOG_CONS|LOG_PID, LOG_AUTH);
vsyslog(err, format, args);
va_end(args);
closelog();
}
static void set_option (struct _options *opts, const char *arg)
{
if (strcmp(arg, "no_hosts_equiv") == 0) {
opts->opt_no_hosts_equiv = 1;
return;
}
if (strcmp(arg, "no_rhosts") == 0) {
opts->opt_no_rhosts = 1;
return;
}
if (strcmp(arg, "debug") == 0) {
D(("debugging enabled"));
opts->opt_debug = 1;
return;
}
if (strcmp(arg, "no_warn") == 0) {
opts->opt_nowarn = 1;
return;
}
if (strcmp(arg, "promiscuous") == 0) {
opts->opt_promiscuous = 1; /* used to permit '+' in ...hosts file */
return;
}
if (strcmp(arg, "suppress") == 0) {
opts->opt_suppress = 1; /* used to suppress failure warning message */
return;
}
if (strcmp(arg, "privategroup") == 0) {
opts->opt_private_group = 1; /* used to permit group write on .rhosts
file if group has same name as owner */
return;
}
/*
* All other options are ignored at the present time.
*/
_pam_log(LOG_WARNING, "unrecognized option '%s'", arg);
}
static void set_parameters (struct _options *opts, int flags,
int argc, const char **argv)
{
opts->opt_silent = flags & PAM_SILENT;
opts->opt_disallow_null_authtok = flags & PAM_DISALLOW_NULL_AUTHTOK;
while (argc-- > 0) {
set_option (opts, *argv);
++argv;
}
}
/*
* Obtain the name of the remote host. Currently, this is simply by
* requesting the contents of the PAM_RHOST item.
*/
static int pam_get_rhost(pam_handle_t *pamh, const char **rhost
, const char *prompt)
{
int retval;
const char *current;
retval = pam_get_item (pamh, PAM_RHOST, (const void **)¤t);
if (retval != PAM_SUCCESS)
return retval;
if (current == NULL) {
return PAM_AUTH_ERR;
}
*rhost = current;
return retval; /* pass on any error from conversation */
}
/*
* Obtain the name of the remote user. Currently, this is simply by
* requesting the contents of the PAM_RUSER item.
*/
static int pam_get_ruser(pam_handle_t *pamh, const char **ruser
, const char *prompt)
{
int retval;
const char *current;
retval = pam_get_item (pamh, PAM_RUSER, (const void **)¤t);
if (retval != PAM_SUCCESS)
return retval;
if (current == NULL) {
return PAM_AUTH_ERR;
}
*ruser = current;
return retval; /* pass on any error from conversation */
}
/*
* Returns 1 if positive match, 0 if no match, -1 if negative match.
*/
static int
__icheckhost (pam_handle_t *pamh, struct _options *opts, U32 raddr
, register char *lhost, const char *rhost)
{
struct hostent *hp;
U32 laddr;
int negate=1; /* Multiply return with this to get -1 instead of 1 */
char **pp, *user;
/* Check nis netgroup. We assume that pam has done all needed
paranoia checking before we are handed the rhost */
if (strncmp("+@",lhost,2) == 0)
return(innetgr(&lhost[2],rhost,NULL,NULL));
if (strncmp("-@",lhost,2) == 0)
return(-innetgr(&lhost[2],rhost,NULL,NULL));
/* -host */
if (strncmp("-",lhost,1) == 0) {
negate=-1;
lhost++;
} else if (strcmp("+",lhost) == 0) {
(void) pam_get_item(pamh, PAM_USER, (const void **)&user);
D(("user %s has a `+' host entry", user));
if (opts->opt_promiscuous)
return (1); /* asking for trouble, but ok.. */
/* If not promiscuous: handle as negative */
return (-1);
}
/* Try for raw ip address first. */
if (isdigit(*lhost) && (long)(laddr = inet_addr(lhost)) != -1)
return (negate*(! (raddr ^ laddr)));
/* Better be a hostname. */
hp = gethostbyname(lhost);
if (hp == NULL)
return (0);
/* Spin through ip addresses. */
for (pp = hp->h_addr_list; *pp; ++pp)
if (!memcmp (&raddr, *pp, sizeof (U32)))
return (negate);
/* No match. */
return (0);
}
/* Returns 1 on positive match, 0 on no match, -1 on negative match */
static int __icheckuser(pam_handle_t *pamh, struct _options *opts
, const char *luser, const char *ruser
, const char *rhost)
{
/*
luser is user entry from .rhosts/hosts.equiv file
ruser is user id on remote host
rhost is the remote host name
*/
char *user;
/* [-+]@netgroup */
if (strncmp("+@",luser,2) == 0)
return (innetgr(&luser[2],NULL,ruser,NULL));
if (strncmp("-@",luser,2) == 0)
return (-innetgr(&luser[2],NULL,ruser,NULL));
/* -user */
if (strncmp("-",luser,1) == 0)
return(-(strcmp(&luser[1],ruser) == 0));
/* + */
if (strcmp("+",luser) == 0) {
(void) pam_get_item(pamh, PAM_USER, (const void **)&user);
_pam_log(LOG_WARNING, "user %s has a `+' user entry", user);
if (opts->opt_promiscuous)
return(1);
/* If not promiscuous we handle it as a negative match */
return(-1);
}
/* simple string match */
return (strcmp(ruser, luser) == 0);
}
/*
* Returns 1 for blank lines (or only comment lines) and 0 otherwise
*/
static int __isempty(char *p)
{
while (*p && isspace(*p)) {
++p;
}
return (*p == '\0' || *p == '#') ? 1:0 ;
}
/*
* Returns 0 if positive match, 1 if _not_ ok.
*/
static int
__ivaliduser (pam_handle_t *pamh, struct _options *opts,
FILE *hostf, U32 raddr,
const char *luser, const char *ruser, const char *rhost)
{
register const char *user;
register char *p;
int hcheck, ucheck;
char buf[MAXHOSTNAMELEN + 128]; /* host + login */
buf[sizeof (buf)-1] = '\0'; /* terminate line */
while (fgets(buf, sizeof(buf), hostf) != NULL) { /* hostf file line */
p = buf; /* from beginning of file.. */
/* Skip empty or comment lines */
if (__isempty(p)) {
continue;
}
/* Skip lines that are too long. */
if (strchr(p, '\n') == NULL) {
int ch = getc(hostf);
while (ch != '\n' && ch != EOF)
ch = getc(hostf);
continue;
}
/*
* If there is a hostname at the start of the line. Set it to
* lower case. A leading ' ' or '\t' indicates no hostname
*/
for (;*p && !isspace(*p); ++p) {
*p = tolower(*p);
}
/*
* next we want to find the permitted name for the remote user
*/
if (*p == ' ' || *p == '\t') {
/* <nul> terminate hostname and skip spaces */
for (*p++='\0'; *p && isspace(*p); ++p);
user = p; /* this is the user's name */
while (*p && !isspace(*p))
++p; /* find end of user's name */
} else
user = p;
*p = '\0'; /* <nul> terminate username (+host?) */
/* buf -> host(?) ; user -> username(?) */
/* First check host part */
hcheck=__icheckhost(pamh, opts, raddr, buf, rhost);
if (hcheck<0)
return(1);
if (hcheck) {
/* Then check user part */
if (! (*user))
user = luser;
ucheck=__icheckuser(pamh, opts, user, ruser, rhost);
/* Positive 'host user' match? */
if (ucheck>0)
return(0);
/* Negative 'host -user' match? */
if (ucheck<0)
return(1);
/* Neither, go on looking for match */
}
}
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.
*/
static int
pam_iruserok(pam_handle_t *pamh,
struct _options *opts, U32 raddr, int superuser,
const char *ruser, const char *luser, const char *rhost)
{
const char *cp;
struct stat sbuf;
struct passwd *pwd;
FILE *hostf;
uid_t uid;
int answer;
char pbuf[MAXPATHLEN]; /* potential buffer overrun */
if ( !superuser && !opts->opt_no_hosts_equiv ) {
/* try to open system hosts.equiv file */
hostf = fopen (_PATH_HEQUIV, "r");
if (hostf) {
answer = __ivaliduser(pamh, opts, hostf, raddr, luser
, ruser, rhost);
(void) fclose(hostf);
if (answer == 0)
return 0; /* remote host is equivalent to localhost */
} /* else {
No hosts.equiv file on system.
} */
}
if ( opts->opt_no_rhosts )
return 1;
/*
* Identify user's local .rhosts file
*/
pwd = getpwnam(luser);
if (pwd == NULL) {
/*
* luser is assumed to be valid because of an earlier check for uid = 0
* we don't log this error twice. However, this shouldn't happen !
* --cristiang
*/
return(1);
}
/* check for buffer overrun */
if (strlen(pwd->pw_dir) + sizeof(USER_RHOSTS_FILE) + 2 >= MAXPATHLEN) {
if (opts->opt_debug)
_pam_log(LOG_DEBUG,"home directory for `%s' is too long", luser);
return 1; /* to dangerous to try */
}
(void) strcpy(pbuf, pwd->pw_dir);
(void) strcat(pbuf, USER_RHOSTS_FILE);
/*
* Change effective uid while _reading_ .rhosts. (not just
* opening). If root and reading an NFS mounted file system,
* can't read files that are 0600 as .rhosts files should be.
*/
/* We are root, this will not fail */
#ifdef linux
/* If we are on linux the better way is setfsuid */
uid = setfsuid(pwd->pw_uid);
hostf = fopen(pbuf, "r");
#else
uid = geteuid();
(void) seteuid(pwd->pw_uid);
hostf = fopen(pbuf, "r");
#endif
if (hostf == NULL) {
if (opts->opt_debug)
_pam_log(LOG_DEBUG,"Could not open %s file",pbuf);
answer = 1;
goto exit_function;
}
/*
* 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 || !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_IWOTH)
cp = ".rhosts writable by other!";
else if (sbuf.st_mode & S_IWGRP) {
/* private group caveat */
if (opts->opt_private_group) {
struct group *grp = getgrgid(sbuf.st_gid);
if (NULL == grp || NULL == grp->gr_name
|| strcmp(luser,grp->gr_name)) {
cp = ".rhosts writable by public group";
} else if (grp->gr_mem) {
int gcount;
/* require at most one member (luser) of this group */
for (gcount=0; grp->gr_mem[gcount]; ++gcount) {
if (strcmp(grp->gr_mem[gcount], luser)) {
gcount = -1;
break;
}
}
if (gcount < 0) {
cp = ".rhosts writable by other members of group";
}
}
} else {
cp = ".rhosts writable by group";
}
} /* It is _NOT_ safe to append an else here... Do so prior to
* S_IWGRP check */
/* If there were any problems, quit. */
if (cp) {
opts->last_error = cp;
answer = 1;
goto exit_function;
}
answer = __ivaliduser (pamh, opts, hostf, raddr, luser, ruser, rhost);
exit_function:
/*
* Go here to exit after the fsuid/euid has been adjusted so that
* they are reset before we exit.
*/
#ifdef linux
setfsuid(uid);
#else
(void)seteuid(uid);
#endif
if (hostf != NULL)
(void) fclose(hostf);
return answer;
}
static int
pam_ruserok (pam_handle_t *pamh,
struct _options *opts, const char *rhost, int superuser,
const char *ruser, const char *luser)
{
struct hostent *hp;
int answer = 1; /* default to failure */
U32 *addrs;
int n, i;
opts->last_error = (char *) 0;
hp = gethostbyname(rhost); /* identify host */
if (hp != NULL) {
/* First of all check the address length */
if (hp->h_length != 4) {
_pam_log(LOG_ALERT, "pam_rhosts module can't work with not IPv4 "
"addresses");
return 1; /* not allowed */
}
/* loop though address list */
for (n = 0; hp->h_addr_list[n]; n++);
D(("rhosts: %d addresses", n));
if (n) {
addrs = calloc (n, hp->h_length);
for (i = 0; i < n; i++)
memcpy (addrs+i, hp->h_addr_list[i], hp->h_length);
for (i = 0; i < n && answer; i++) {
D(("rhosts: address %d is %04x", i, addrs[i]));
answer = pam_iruserok(pamh, opts, addrs[i], superuser,
ruser, luser, rhost);
/* answer == 0 means success */
}
free (addrs);
}
}
return answer;
}
/*
* Internal function to do authentication
*/
static int _pam_auth_rhosts (pam_handle_t *pamh,
int flags,
int argc,
const char **argv)
{
int retval;
const char *luser;
const char *ruser,*rhost;
struct _options opts;
int as_root = 0;
/*
* Look at the options and set the flags accordingly.
*/
memset (&opts, 0, sizeof (opts));
set_parameters (&opts, flags, argc, argv);
/*
* Obtain the parameters for the various items
*/
for (;;) { /* abuse loop to avoid goto */
/* get the remotehost */
retval = pam_get_rhost(pamh, &rhost, NULL);
(void) pam_set_item(pamh, PAM_RHOST, rhost);
if (retval != PAM_SUCCESS) {
if (opts.opt_debug) {
_pam_log(LOG_DEBUG, "could not get the remote host name");
}
break;
}
/* get the remote user */
retval = pam_get_ruser(pamh, &ruser, NULL);
(void) pam_set_item(pamh, PAM_RUSER, ruser);
if (retval != PAM_SUCCESS) {
if (opts.opt_debug)
_pam_log(LOG_DEBUG, "could not get the remote username");
break;
}
/* get the local user */
retval = pam_get_user(pamh, &luser, NULL);
if (retval != PAM_SUCCESS) {
if (opts.opt_debug)
_pam_log(LOG_DEBUG, "could not determine name of local user");
break;
}
/* check if the luser uid == 0... --cristiang */
{
struct passwd *luser_pwd;
luser_pwd = getpwnam(luser);
if (luser_pwd == NULL) {
if (opts.opt_debug)
_pam_log(LOG_DEBUG, "user '%s' unknown to this system",
luser);
retval = PAM_AUTH_ERR;
break;
}
if (luser_pwd->pw_uid == 0)
as_root = 1;
luser_pwd = NULL; /* forget */
}
/*
* Validate the account information.
*/
if (pam_ruserok (pamh, &opts, rhost, as_root, ruser, luser) != 0) {
if ( !opts.opt_suppress ) {
_pam_log(LOG_WARNING, "denied to %s@%s as %s: %s",
ruser, rhost, luser, (opts.last_error==NULL) ?
"access not allowed":opts.last_error);
}
retval = PAM_AUTH_ERR;
} else {
_pam_log(LOG_NOTICE, "allowed to %s@%s as %s",
ruser, rhost, luser);
}
break;
}
return retval;
}
/* --- authentication management functions --- */
PAM_EXTERN
int pam_sm_authenticate (pam_handle_t *pamh,
int flags,
int argc,
const char **argv)
{
int retval;
if (sizeof(U32) != 4) {
_pam_log (LOG_ALERT, "pam_rhosts module can\'t work on this hardware "
"(yet)");
return PAM_AUTH_ERR;
}
sethostent(1);
retval = _pam_auth_rhosts (pamh, flags, argc, argv);
endhostent();
return retval;
}
PAM_EXTERN
int pam_sm_setcred(pam_handle_t *pamh,int flags,int argc,
const char **argv)
{
return PAM_SUCCESS;
}
/* end of module definition */
#ifdef PAM_STATIC
/* static module data */
struct pam_module _pam_rhosts_auth_modstruct = {
"pam_rhosts_auth",
pam_sm_authenticate,
pam_sm_setcred,
NULL,
NULL,
NULL,
NULL,
};
#endif
/*
* $Log: pam_rhosts_auth.c,v $
* Revision 1.12 1997/09/27 14:34:01 morgan
* fixed comment and renamed iruserok to pam_iruserok.
*
* Revision 1.11 1997/04/05 06:26:39 morgan
* fairly major fixes and enhancements (see CHANGELOG for 0.57 release)
*
* Revision 1.10 1997/02/09 02:09:30 morgan
* - implementation of 'debug' argument (Cristian Gafton)
* - we check for uid=0 accounts instead of hardcoded 'root' (Cristian Gafton)
*
* Revision 1.9 1996/12/01 03:09:47 morgan
* *** empty log message ***
*
* Revision 1.8 1996/11/12 06:08:59 morgan
* Oliver Crow's "rootok" patch plus a little clean up of set_option
* (AGM)
*
* Revision 1.7 1996/11/10 20:15:56 morgan
* cross platform support
*
* Revision 1.6 1996/08/09 05:46:29 morgan
* removed code for manually setting the remote username etc..
*
*/
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