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freebsd/usr.sbin/ppp/auth.c

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/*
* PPP Secret Key Module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1994, Internet Initiative Japan, Inc. All rights reserverd.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the Internet Initiative Japan, Inc. The name of the
* IIJ may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: auth.c,v 1.27.2.11 1998/03/09 19:25:33 brian Exp $
*
* TODO:
* o Implement check against with registered IP addresses.
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <assert.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "command.h"
#include "mbuf.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "iplist.h"
#include "throughput.h"
#include "ipcp.h"
#include "loadalias.h"
#include "vars.h"
#include "auth.h"
#include "systems.h"
#include "lcp.h"
#include "lqr.h"
#include "hdlc.h"
#include "async.h"
#include "link.h"
#include "descriptor.h"
#include "physical.h"
#include "chat.h"
#include "lcpproto.h"
const char *
Auth2Nam(u_short auth)
{
switch (auth) {
case PROTO_PAP:
return "PAP";
case PROTO_CHAP:
return "CHAP";
case 0:
return "none";
}
return "unknown";
}
void
LocalAuthInit()
{
if (!(mode&MODE_DAEMON))
/* We're allowed in interactive mode */
VarLocalAuth = LOCAL_AUTH;
else if (VarHaveLocalAuthKey)
VarLocalAuth = *VarLocalAuthKey == '\0' ? LOCAL_AUTH : LOCAL_NO_AUTH;
else
switch (LocalAuthValidate(SECRETFILE, VarShortHost, "")) {
case NOT_FOUND:
VarLocalAuth = LOCAL_DENY;
break;
case VALID:
VarLocalAuth = LOCAL_AUTH;
break;
case INVALID:
VarLocalAuth = LOCAL_NO_AUTH;
break;
}
}
LOCAL_AUTH_VALID
LocalAuthValidate(const char *fname, const char *system, const char *key)
{
FILE *fp;
int n;
char *vector[3];
char buff[LINE_LEN];
LOCAL_AUTH_VALID rc;
rc = NOT_FOUND; /* No system entry */
fp = OpenSecret(fname);
if (fp == NULL)
return (rc);
while (fgets(buff, sizeof buff, fp)) {
if (buff[0] == '#')
continue;
buff[strlen(buff) - 1] = 0;
memset(vector, '\0', sizeof vector);
n = MakeArgs(buff, vector, VECSIZE(vector));
if (n < 1)
continue;
if (strcmp(vector[0], system) == 0) {
if ((vector[1] == (char *) NULL && (key == NULL || *key == '\0')) ||
(vector[1] != (char *) NULL && strcmp(vector[1], key) == 0)) {
rc = VALID; /* Valid */
} else {
rc = INVALID; /* Invalid */
}
break;
}
}
CloseSecret(fp);
return (rc);
}
static int
auth_CheckPasswd(const char *name, const char *data, const char *key)
{
if (!strcmp(data, "*")) {
/* Then look up the real password database */
struct passwd *pw;
int result;
result = (pw = getpwnam(name)) &&
!strcmp(crypt(key, pw->pw_passwd), pw->pw_passwd);
endpwent();
return result;
}
return !strcmp(data, key);
}
int
AuthValidate(struct bundle *bundle, const char *fname, const char *system,
const char *key, struct physical *physical)
{
/* Used by PAP routines */
FILE *fp;
int n;
char *vector[5];
char buff[LINE_LEN];
fp = OpenSecret(fname);
if (fp != NULL) {
while (fgets(buff, sizeof buff, fp)) {
if (buff[0] == '#')
continue;
buff[strlen(buff) - 1] = 0;
memset(vector, '\0', sizeof vector);
n = MakeArgs(buff, vector, VECSIZE(vector));
if (n < 2)
continue;
if (strcmp(vector[0], system) == 0)
if (auth_CheckPasswd(vector[0], vector[1], key)) {
CloseSecret(fp);
if (n > 2 && !UseHisaddr(bundle, vector[2], 1))
return (0);
/* XXX This should be deferred - we may join an existing bundle ! */
ipcp_Setup(&IpcpInfo);
if (n > 3)
SetLabel(vector[3]);
return 1; /* Valid */
} else {
CloseSecret(fp);
return 0; /* Invalid */
}
}
CloseSecret(fp);
}
#ifndef NOPASSWDAUTH
if (Enabled(ConfPasswdAuth))
return auth_CheckPasswd(system, "*", key);
#endif
return 0; /* Invalid */
}
char *
AuthGetSecret(struct bundle *bundle, const char *fname, const char *system,
int len, int setaddr, struct physical *physical)
{
/* Used by CHAP routines */
FILE *fp;
int n;
char *vector[5];
static char buff[LINE_LEN];
fp = OpenSecret(fname);
if (fp == NULL)
return (NULL);
while (fgets(buff, sizeof buff, fp)) {
if (buff[0] == '#')
continue;
buff[strlen(buff) - 1] = 0;
memset(vector, '\0', sizeof vector);
n = MakeArgs(buff, vector, VECSIZE(vector));
if (n < 2)
continue;
if (strlen(vector[0]) == len && strncmp(vector[0], system, len) == 0) {
if (setaddr)
memset(&IpcpInfo.cfg.peer_range, '\0', sizeof IpcpInfo.cfg.peer_range);
if (n > 2 && setaddr)
if (UseHisaddr(bundle, vector[2], 1))
/* XXX This should be deferred - we may join an existing bundle ! */
ipcp_Setup(&IpcpInfo);
else
return NULL;
if (n > 3)
SetLabel(vector[3]);
return vector[1];
}
}
CloseSecret(fp);
return (NULL); /* Invalid */
}
static void
AuthTimeout(void *vauthp)
{
struct authinfo *authp = (struct authinfo *)vauthp;
StopTimer(&authp->authtimer);
if (--authp->retry > 0) {
StartTimer(&authp->authtimer);
(*authp->ChallengeFunc)(authp, ++authp->id, authp->physical);
}
}
void
authinfo_Init(struct authinfo *authinfo)
{
memset(authinfo, '\0', sizeof(struct authinfo));
}
void
StartAuthChallenge(struct authinfo *authp, struct physical *physical,
void (*fn)(struct authinfo *, int, struct physical *))
{
authp->ChallengeFunc = fn;
authp->physical = physical;
StopTimer(&authp->authtimer);
authp->authtimer.func = AuthTimeout;
authp->authtimer.load = VarRetryTimeout * SECTICKS;
authp->authtimer.state = TIMER_STOPPED;
authp->authtimer.arg = (void *) authp;
authp->retry = 3;
authp->id = 1;
(*authp->ChallengeFunc)(authp, authp->id, physical);
StartTimer(&authp->authtimer);
}
void
StopAuthTimer(struct authinfo *authp)
{
StopTimer(&authp->authtimer);
authp->physical = NULL;
}