/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
* Internet Initiative Japan, Inc (IIJ)
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#ifndef NOPAM
#include <security/pam_appl.h>
#ifdef OPENPAM
#include <security/openpam.h>
#endif
#endif /* !NOPAM */
#include "layer.h"
#include "mbuf.h"
#include "defs.h"
#include "log.h"
#include "timer.h"
#include "fsm.h"
#include "iplist.h"
#include "throughput.h"
#include "slcompress.h"
#include "lqr.h"
#include "hdlc.h"
#include "ncpaddr.h"
#include "ipcp.h"
#include "auth.h"
#include "systems.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "descriptor.h"
#include "chat.h"
#include "proto.h"
#include "filter.h"
#include "mp.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "cbcp.h"
#include "chap.h"
#include "async.h"
#include "physical.h"
#include "datalink.h"
#include "ipv6cp.h"
#include "ncp.h"
#include "bundle.h"
const char *
Auth2Nam(u_short auth, u_char type)
{
static char chap[10];
switch (auth) {
case PROTO_PAP:
return "PAP";
case PROTO_CHAP:
snprintf(chap, sizeof chap, "CHAP 0x%02x", type);
return chap;
case 0:
return "none";
}
return "unknown";
}
#if !defined(NOPAM) && !defined(OPENPAM)
static int
pam_conv(int n, const struct pam_message **msg, struct pam_response **resp,
void *data)
{
if (n != 1 || msg[0]->msg_style != PAM_PROMPT_ECHO_OFF)
return (PAM_CONV_ERR);
if ((*resp = malloc(sizeof(struct pam_response))) == NULL)
return (PAM_CONV_ERR);
(*resp)[0].resp = strdup((const char *)data);
(*resp)[0].resp_retcode = 0;
return ((*resp)[0].resp != NULL ? PAM_SUCCESS : PAM_CONV_ERR);
}
#endif /* !defined(NOPAM) && !defined(OPENPAM) */
static int
auth_CheckPasswd(const char *name, const char *data, const char *key)
{
if (!strcmp(data, "*")) {
#ifdef NOPAM
/* Then look up the real password database */
struct passwd *pw;
int result = 0;
char *cryptpw;
pw = getpwnam(name);
if (pw) {
cryptpw = crypt(key, pw->pw_passwd);
result = (cryptpw != NULL) && !strcmp(cryptpw, pw->pw_passwd);
}
endpwent();
return result;
#else /* !NOPAM */
/* Then consult with PAM. */
pam_handle_t *pamh;
int status;
struct pam_conv pamc = {
#ifdef OPENPAM
&openpam_nullconv, NULL
#else
&pam_conv, key
#endif
};
if (pam_start("ppp", name, &pamc, &pamh) != PAM_SUCCESS)
return (0);
#ifdef OPENPAM
if ((status = pam_set_item(pamh, PAM_AUTHTOK, key)) == PAM_SUCCESS)
#endif
status = pam_authenticate(pamh, 0);
pam_end(pamh, status);
return (status == PAM_SUCCESS);
#endif /* !NOPAM */
}
return !strcmp(data, key);
}
int
auth_SetPhoneList(const char *name, char *phone, int phonelen)
{
FILE *fp;
int n, lineno;
char *vector[6], buff[LINE_LEN];
const char *slash;
fp = OpenSecret(SECRETFILE);
if (fp != NULL) {
again:
lineno = 0;
while (fgets(buff, sizeof buff, fp)) {
lineno++;
if (buff[0] == '#')
continue;
buff[strlen(buff) - 1] = '\0';
memset(vector, '\0', sizeof vector);
if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0)
log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno);
if (n < 5)
continue;
if (strcmp(vector[0], name) == 0) {
CloseSecret(fp);
if (*vector[4] == '\0')
return 0;
strncpy(phone, vector[4], phonelen - 1);
phone[phonelen - 1] = '\0';
return 1; /* Valid */
}
}
if ((slash = strrchr(name, '\\')) != NULL && slash[1]) {
/* Look for the name without the leading domain */
name = slash + 1;
rewind(fp);
goto again;
}
CloseSecret(fp);
}
*phone = '\0';
return 0;
}
int
auth_Select(struct bundle *bundle, const char *name)
{
FILE *fp;
int n, lineno;
char *vector[5], buff[LINE_LEN];
const char *slash;
if (*name == '\0') {
ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE);
return 1;
}
#ifndef NORADIUS
if (bundle->radius.valid && bundle->radius.ip.s_addr != INADDR_NONE &&
bundle->radius.ip.s_addr != RADIUS_INADDR_POOL) {
/* We've got a radius IP - it overrides everything */
if (!ipcp_UseHisIPaddr(bundle, bundle->radius.ip))
return 0;
ipcp_Setup(&bundle->ncp.ipcp, bundle->radius.mask.s_addr);
/* Continue with ppp.secret in case we've got a new label */
}
#endif
fp = OpenSecret(SECRETFILE);
if (fp != NULL) {
again:
lineno = 0;
while (fgets(buff, sizeof buff, fp)) {
lineno++;
if (buff[0] == '#')
continue;
buff[strlen(buff) - 1] = '\0';
memset(vector, '\0', sizeof vector);
if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0)
log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno);
if (n < 2)
continue;
if (strcmp(vector[0], name) == 0) {
CloseSecret(fp);
#ifndef NORADIUS
if (!bundle->radius.valid || bundle->radius.ip.s_addr == INADDR_NONE) {
#endif
if (n > 2 && *vector[2] && strcmp(vector[2], "*") &&
!ipcp_UseHisaddr(bundle, vector[2], 1))
return 0;
ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE);
#ifndef NORADIUS
}
#endif
if (n > 3 && *vector[3] && strcmp(vector[3], "*"))
bundle_SetLabel(bundle, vector[3]);
return 1; /* Valid */
}
}
if ((slash = strrchr(name, '\\')) != NULL && slash[1]) {
/* Look for the name without the leading domain */
name = slash + 1;
rewind(fp);
goto again;
}
CloseSecret(fp);
}
#ifndef NOPASSWDAUTH
/* Let 'em in anyway - they must have been in the passwd file */
ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE);
return 1;
#else
#ifndef NORADIUS
if (bundle->radius.valid)
return 1;
#endif
/* Disappeared from ppp.secret ??? */
return 0;
#endif
}
int
auth_Validate(struct bundle *bundle, const char *name, const char *key)
{
/* Used by PAP routines */
FILE *fp;
int n, lineno;
char *vector[5], buff[LINE_LEN];
const char *slash;
fp = OpenSecret(SECRETFILE);
again:
lineno = 0;
if (fp != NULL) {
while (fgets(buff, sizeof buff, fp)) {
lineno++;
if (buff[0] == '#')
continue;
buff[strlen(buff) - 1] = 0;
memset(vector, '\0', sizeof vector);
if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0)
log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno);
if (n < 2)
continue;
if (strcmp(vector[0], name) == 0) {
CloseSecret(fp);
return auth_CheckPasswd(name, vector[1], key);
}
}
}
if ((slash = strrchr(name, '\\')) != NULL && slash[1]) {
/* Look for the name without the leading domain */
name = slash + 1;
if (fp != NULL) {
rewind(fp);
goto again;
}
}
if (fp != NULL)
CloseSecret(fp);
#ifndef NOPASSWDAUTH
if (Enabled(bundle, OPT_PASSWDAUTH))
return auth_CheckPasswd(name, "*", key);
#endif
return 0; /* Invalid */
}
char *
auth_GetSecret(const char *name, size_t len)
{
/* Used by CHAP routines */
FILE *fp;
int n, lineno;
char *vector[5];
const char *slash;
static char buff[LINE_LEN]; /* vector[] will point here when returned */
fp = OpenSecret(SECRETFILE);
if (fp == NULL)
return (NULL);
again:
lineno = 0;
while (fgets(buff, sizeof buff, fp)) {
lineno++;
if (buff[0] == '#')
continue;
n = strlen(buff) - 1;
if (buff[n] == '\n')
buff[n] = '\0'; /* Trim the '\n' */
memset(vector, '\0', sizeof vector);
if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0)
log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno);
if (n < 2)
continue;
if (strlen(vector[0]) == len && strncmp(vector[0], name, len) == 0) {
CloseSecret(fp);
return vector[1];
}
}
if ((slash = strrchr(name, '\\')) != NULL && slash[1]) {
/* Go back and look for the name without the leading domain */
len -= slash - name + 1;
name = slash + 1;
rewind(fp);
goto again;
}
CloseSecret(fp);
return (NULL); /* Invalid */
}
static void
AuthTimeout(void *vauthp)
{
struct authinfo *authp = (struct authinfo *)vauthp;
timer_Stop(&authp->authtimer);
if (--authp->retry > 0) {
authp->id++;
(*authp->fn.req)(authp);
timer_Start(&authp->authtimer);
} else {
log_Printf(LogPHASE, "Auth: No response from server\n");
datalink_AuthNotOk(authp->physical->dl);
}
}
void
auth_Init(struct authinfo *authp, struct physical *p, auth_func req,
auth_func success, auth_func failure)
{
memset(authp, '\0', sizeof(struct authinfo));
authp->cfg.fsm.timeout = DEF_FSMRETRY;
authp->cfg.fsm.maxreq = DEF_FSMAUTHTRIES;
authp->cfg.fsm.maxtrm = 0; /* not used */
authp->fn.req = req;
authp->fn.success = success;
authp->fn.failure = failure;
authp->physical = p;
}
void
auth_StartReq(struct authinfo *authp)
{
timer_Stop(&authp->authtimer);
authp->authtimer.func = AuthTimeout;
authp->authtimer.name = "auth";
authp->authtimer.load = authp->cfg.fsm.timeout * SECTICKS;
authp->authtimer.arg = (void *)authp;
authp->retry = authp->cfg.fsm.maxreq;
authp->id = 1;
(*authp->fn.req)(authp);
timer_Start(&authp->authtimer);
}
void
auth_StopTimer(struct authinfo *authp)
{
timer_Stop(&authp->authtimer);
}
struct mbuf *
auth_ReadHeader(struct authinfo *authp, struct mbuf *bp)
{
size_t len;
len = m_length(bp);
if (len >= sizeof authp->in.hdr) {
bp = mbuf_Read(bp, (u_char *)&authp->in.hdr, sizeof authp->in.hdr);
if (len >= ntohs(authp->in.hdr.length))
return bp;
authp->in.hdr.length = htons(0);
log_Printf(LogWARN, "auth_ReadHeader: Short packet (%u > %zu) !\n",
ntohs(authp->in.hdr.length), len);
} else {
authp->in.hdr.length = htons(0);
log_Printf(LogWARN, "auth_ReadHeader: Short packet header (%u > %zu) !\n",
(int)(sizeof authp->in.hdr), len);
}
m_freem(bp);
return NULL;
}
struct mbuf *
auth_ReadName(struct authinfo *authp, struct mbuf *bp, size_t len)
{
if (len > sizeof authp->in.name - 1)
log_Printf(LogWARN, "auth_ReadName: Name too long (%zu) !\n", len);
else {
size_t mlen = m_length(bp);
if (len > mlen)
log_Printf(LogWARN, "auth_ReadName: Short packet (%zu > %zu) !\n",
len, mlen);
else {
bp = mbuf_Read(bp, (u_char *)authp->in.name, len);
authp->in.name[len] = '\0';
return bp;
}
}
*authp->in.name = '\0';
m_freem(bp);
return NULL;
}
