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freebsd/usr.sbin/ppp/radius.c
Brian Somers 50ca6ec387 Don't assume challenges and responses don't contain embedded '\0's. 
Mschapv2 response generation may produce embedded NULs... causing
us to send a bogus response to the radius server and end up
failing the client's valid response.

Problem pointed out by: Eugene Vigovskiy <vigov@com2com.ru>
2001-04-01 22:39:17 +00:00

656 lines
19 KiB
C
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/*
* Copyright 1999 Internet Business Solutions Ltd., Switzerland
* 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 <sys/socket.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <sys/un.h>
#include <net/route.h>
#ifdef LOCALRAD
#include "radlib.h"
#else
#include <radlib.h>
#endif
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <termios.h>
#include <ttyent.h>
#include <unistd.h>
#include <netdb.h>
#include "layer.h"
#include "defs.h"
#include "log.h"
#include "descriptor.h"
#include "prompt.h"
#include "timer.h"
#include "fsm.h"
#include "iplist.h"
#include "slcompress.h"
#include "throughput.h"
#include "lqr.h"
#include "hdlc.h"
#include "mbuf.h"
#include "ipcp.h"
#include "route.h"
#include "command.h"
#include "filter.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "mp.h"
#include "radius.h"
#include "auth.h"
#include "async.h"
#include "physical.h"
#include "chat.h"
#include "cbcp.h"
#include "chap.h"
#include "datalink.h"
#include "bundle.h"
/*
* rad_continue_send_request() has given us `got' (non-zero). Deal with it.
*/
static void
radius_Process(struct radius *r, int got)
{
char *argv[MAXARGS], *nuke;
struct bundle *bundle;
int argc, addrs;
size_t len;
struct in_range dest;
struct in_addr gw;
const void *data;
const char *stype;
r->cx.fd = -1; /* Stop select()ing */
stype = r->cx.auth ? "auth" : "acct";
switch (got) {
case RAD_ACCESS_ACCEPT:
log_Printf(LogPHASE, "Radius(%s): ACCEPT received\n", stype);
if (!r->cx.auth) {
rad_close(r->cx.rad);
return;
}
break;
case RAD_ACCESS_REJECT:
log_Printf(LogPHASE, "Radius(%s): REJECT received\n", stype);
if (r->cx.auth)
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
case RAD_ACCESS_CHALLENGE:
/* we can't deal with this (for now) ! */
log_Printf(LogPHASE, "Radius: CHALLENGE received (can't handle yet)\n");
if (r->cx.auth)
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
case RAD_ACCOUNTING_RESPONSE:
log_Printf(LogPHASE, "Radius(%s): Accounting response received\n", stype);
if (r->cx.auth)
auth_Failure(r->cx.auth); /* unexpected !!! */
/* No further processing for accounting requests, please */
rad_close(r->cx.rad);
return;
case -1:
log_Printf(LogPHASE, "radius(%s): %s\n", stype, rad_strerror(r->cx.rad));
if (r->cx.auth)
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
default:
log_Printf(LogERROR, "rad_send_request(%s): Failed %d: %s\n", stype,
got, rad_strerror(r->cx.rad));
if (r->cx.auth)
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
}
/* So we've been accepted ! Let's see what we've got in our reply :-I */
r->ip.s_addr = r->mask.s_addr = INADDR_NONE;
r->mtu = 0;
r->vj = 0;
while ((got = rad_get_attr(r->cx.rad, &data, &len)) > 0) {
switch (got) {
case RAD_FRAMED_IP_ADDRESS:
r->ip = rad_cvt_addr(data);
log_Printf(LogPHASE, " IP %s\n", inet_ntoa(r->ip));
break;
case RAD_FRAMED_IP_NETMASK:
r->mask = rad_cvt_addr(data);
log_Printf(LogPHASE, " Netmask %s\n", inet_ntoa(r->mask));
break;
case RAD_FRAMED_MTU:
r->mtu = rad_cvt_int(data);
log_Printf(LogPHASE, " MTU %lu\n", r->mtu);
break;
case RAD_FRAMED_ROUTING:
/* Disabled for now - should we automatically set up some filters ? */
/* rad_cvt_int(data); */
/* bit 1 = Send routing packets */
/* bit 2 = Receive routing packets */
break;
case RAD_FRAMED_COMPRESSION:
r->vj = rad_cvt_int(data) == 1 ? 1 : 0;
log_Printf(LogPHASE, " VJ %sabled\n", r->vj ? "en" : "dis");
break;
case RAD_FRAMED_ROUTE:
/*
* We expect a string of the format ``dest[/bits] gw [metrics]''
* Any specified metrics are ignored. MYADDR and HISADDR are
* understood for ``dest'' and ``gw'' and ``0.0.0.0'' is the same
* as ``HISADDR''.
*/
if ((nuke = rad_cvt_string(data, len)) == NULL) {
log_Printf(LogERROR, "rad_cvt_string: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
log_Printf(LogPHASE, " Route: %s\n", nuke);
bundle = r->cx.auth->physical->dl->bundle;
dest.ipaddr.s_addr = dest.mask.s_addr = INADDR_ANY;
dest.width = 0;
argc = command_Interpret(nuke, strlen(nuke), argv);
if (argc < 0)
log_Printf(LogWARN, "radius: %s: Syntax error\n",
argc == 1 ? argv[0] : "\"\"");
else if (argc < 2)
log_Printf(LogWARN, "radius: %s: Invalid route\n",
argc == 1 ? argv[0] : "\"\"");
else if ((strcasecmp(argv[0], "default") != 0 &&
!ParseAddr(&bundle->ncp.ipcp, argv[0], &dest.ipaddr,
&dest.mask, &dest.width)) ||
!ParseAddr(&bundle->ncp.ipcp, argv[1], &gw, NULL, NULL))
log_Printf(LogWARN, "radius: %s %s: Invalid route\n",
argv[0], argv[1]);
else {
if (dest.width == 32 && strchr(argv[0], '/') == NULL)
/* No mask specified - use the natural mask */
dest.mask = addr2mask(dest.ipaddr);
addrs = 0;
if (!strncasecmp(argv[0], "HISADDR", 7))
addrs = ROUTE_DSTHISADDR;
else if (!strncasecmp(argv[0], "MYADDR", 6))
addrs = ROUTE_DSTMYADDR;
if (gw.s_addr == INADDR_ANY) {
addrs |= ROUTE_GWHISADDR;
gw = bundle->ncp.ipcp.peer_ip;
} else if (strcasecmp(argv[1], "HISADDR") == 0)
addrs |= ROUTE_GWHISADDR;
route_Add(&r->routes, addrs, dest.ipaddr, dest.mask, gw);
}
free(nuke);
break;
}
}
if (got == -1) {
log_Printf(LogERROR, "rad_get_attr: %s (failing!)\n",
rad_strerror(r->cx.rad));
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
} else {
r->valid = 1;
auth_Success(r->cx.auth);
rad_close(r->cx.rad);
}
}
/*
* We've either timed out or select()ed on the read descriptor
*/
static void
radius_Continue(struct radius *r, int sel)
{
struct timeval tv;
int got;
timer_Stop(&r->cx.timer);
if ((got = rad_continue_send_request(r->cx.rad, sel, &r->cx.fd, &tv)) == 0) {
log_Printf(LogPHASE, "Radius: Request re-sent\n");
r->cx.timer.load = tv.tv_usec / TICKUNIT + tv.tv_sec * SECTICKS;
timer_Start(&r->cx.timer);
return;
}
radius_Process(r, got);
}
/*
* Time to call rad_continue_send_request() - timed out.
*/
static void
radius_Timeout(void *v)
{
radius_Continue((struct radius *)v, 0);
}
/*
* Time to call rad_continue_send_request() - something to read.
*/
static void
radius_Read(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset)
{
radius_Continue(descriptor2radius(d), 1);
}
/*
* Behave as a struct fdescriptor (descriptor.h)
*/
static int
radius_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
{
struct radius *rad = descriptor2radius(d);
if (r && rad->cx.fd != -1) {
FD_SET(rad->cx.fd, r);
if (*n < rad->cx.fd + 1)
*n = rad->cx.fd + 1;
log_Printf(LogTIMER, "Radius: fdset(r) %d\n", rad->cx.fd);
return 1;
}
return 0;
}
/*
* Behave as a struct fdescriptor (descriptor.h)
*/
static int
radius_IsSet(struct fdescriptor *d, const fd_set *fdset)
{
struct radius *r = descriptor2radius(d);
return r && r->cx.fd != -1 && FD_ISSET(r->cx.fd, fdset);
}
/*
* Behave as a struct fdescriptor (descriptor.h)
*/
static int
radius_Write(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset)
{
/* We never want to write here ! */
log_Printf(LogALERT, "radius_Write: Internal error: Bad call !\n");
return 0;
}
/*
* Initialise ourselves
*/
void
radius_Init(struct radius *r)
{
r->valid = 0;
r->cx.fd = -1;
*r->cfg.file = '\0';;
r->desc.type = RADIUS_DESCRIPTOR;
r->desc.UpdateSet = radius_UpdateSet;
r->desc.IsSet = radius_IsSet;
r->desc.Read = radius_Read;
r->desc.Write = radius_Write;
memset(&r->cx.timer, '\0', sizeof r->cx.timer);
log_Printf(LogDEBUG, "Radius: radius_Init\n");
}
/*
* Forget everything and go back to initialised state.
*/
void
radius_Destroy(struct radius *r)
{
r->valid = 0;
log_Printf(LogDEBUG, "Radius: radius_Destroy\n");
timer_Stop(&r->cx.timer);
route_DeleteAll(&r->routes);
if (r->cx.fd != -1) {
r->cx.fd = -1;
rad_close(r->cx.rad);
}
}
/*
* Start an authentication request to the RADIUS server.
*/
void
radius_Authenticate(struct radius *r, struct authinfo *authp, const char *name,
const char *key, int klen, const char *challenge, int clen)
{
struct ttyent *ttyp;
struct timeval tv;
int got, slot;
char hostname[MAXHOSTNAMELEN];
struct hostent *hp;
struct in_addr hostaddr;
if (!*r->cfg.file)
return;
if (r->cx.fd != -1)
/*
* We assume that our name/key/challenge is the same as last time,
* and just continue to wait for the RADIUS server(s).
*/
return;
radius_Destroy(r);
if ((r->cx.rad = rad_auth_open()) == NULL) {
log_Printf(LogERROR, "rad_auth_open: %s\n", strerror(errno));
return;
}
if (rad_config(r->cx.rad, r->cfg.file) != 0) {
log_Printf(LogERROR, "rad_config: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
if (rad_create_request(r->cx.rad, RAD_ACCESS_REQUEST) != 0) {
log_Printf(LogERROR, "rad_create_request: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
if (rad_put_string(r->cx.rad, RAD_USER_NAME, name) != 0 ||
rad_put_int(r->cx.rad, RAD_SERVICE_TYPE, RAD_FRAMED) != 0 ||
rad_put_int(r->cx.rad, RAD_FRAMED_PROTOCOL, RAD_PPP) != 0) {
log_Printf(LogERROR, "rad_put: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
if (challenge != NULL) {
/* We're talking CHAP */
if (rad_put_attr(r->cx.rad, RAD_CHAP_PASSWORD, key, klen) != 0 ||
rad_put_attr(r->cx.rad, RAD_CHAP_CHALLENGE, challenge, clen) != 0) {
log_Printf(LogERROR, "CHAP: rad_put_string: %s\n",
rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
} else if (rad_put_attr(r->cx.rad, RAD_USER_PASSWORD, key, klen) != 0) {
/* We're talking PAP */
log_Printf(LogERROR, "PAP: rad_put_string: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
if (gethostname(hostname, sizeof hostname) != 0)
log_Printf(LogERROR, "rad_put: gethostname(): %s\n", strerror(errno));
else {
if ((hp = gethostbyname(hostname)) != NULL) {
hostaddr.s_addr = *(u_long *)hp->h_addr;
if (rad_put_addr(r->cx.rad, RAD_NAS_IP_ADDRESS, hostaddr) != 0) {
log_Printf(LogERROR, "rad_put: rad_put_string: %s\n",
rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
}
if (rad_put_string(r->cx.rad, RAD_NAS_IDENTIFIER, hostname) != 0) {
log_Printf(LogERROR, "rad_put: rad_put_string: %s\n",
rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
}
if (authp->physical->handler &&
authp->physical->handler->type == TTY_DEVICE) {
setttyent();
for (slot = 1; (ttyp = getttyent()); ++slot)
if (!strcmp(ttyp->ty_name, authp->physical->name.base)) {
if(rad_put_int(r->cx.rad, RAD_NAS_PORT, slot) != 0) {
log_Printf(LogERROR, "rad_put: rad_put_string: %s\n",
rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
endttyent();
return;
}
break;
}
endttyent();
}
r->cx.auth = authp;
if ((got = rad_init_send_request(r->cx.rad, &r->cx.fd, &tv)))
radius_Process(r, got);
else {
log_Printf(LogPHASE, "Radius: Request sent\n");
log_Printf(LogDEBUG, "Using radius_Timeout [%p]\n", radius_Timeout);
r->cx.timer.load = tv.tv_usec / TICKUNIT + tv.tv_sec * SECTICKS;
r->cx.timer.func = radius_Timeout;
r->cx.timer.name = "radius auth";
r->cx.timer.arg = r;
timer_Start(&r->cx.timer);
}
}
/*
* Send an accounting request to the RADIUS server
*/
void
radius_Account(struct radius *r, struct radacct *ac, struct datalink *dl,
int acct_type, struct in_addr *peer_ip, struct in_addr *netmask,
struct pppThroughput *stats)
{
struct ttyent *ttyp;
struct timeval tv;
int got, slot;
char hostname[MAXHOSTNAMELEN];
struct hostent *hp;
struct in_addr hostaddr;
if (!*r->cfg.file)
return;
if (r->cx.fd != -1)
/*
* We assume that our name/key/challenge is the same as last time,
* and just continue to wait for the RADIUS server(s).
*/
return;
radius_Destroy(r);
if ((r->cx.rad = rad_acct_open()) == NULL) {
log_Printf(LogERROR, "rad_auth_open: %s\n", strerror(errno));
return;
}
if (rad_config(r->cx.rad, r->cfg.file) != 0) {
log_Printf(LogERROR, "rad_config: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
if (rad_create_request(r->cx.rad, RAD_ACCOUNTING_REQUEST) != 0) {
log_Printf(LogERROR, "rad_create_request: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
/* Grab some accounting data and initialize structure */
if (acct_type == RAD_START) {
ac->rad_parent = r;
/* Fetch username from datalink */
strncpy(ac->user_name, dl->peer.authname, sizeof ac->user_name);
ac->user_name[AUTHLEN-1] = '\0';
ac->authentic = 2; /* Assume RADIUS verified auth data */
/* Generate a session ID */
snprintf(ac->session_id, sizeof ac->session_id, "%s%d-%s%lu",
dl->bundle->cfg.auth.name, (int)getpid(),
dl->peer.authname, (unsigned long)stats->uptime);
/* And grab our MP socket name */
snprintf(ac->multi_session_id, sizeof ac->multi_session_id, "%s",
dl->bundle->ncp.mp.active ?
dl->bundle->ncp.mp.server.socket.sun_path : "");
/* Fetch IP, netmask from IPCP */
memcpy(&ac->ip, peer_ip, sizeof(ac->ip));
memcpy(&ac->mask, netmask, sizeof(ac->mask));
};
if (rad_put_string(r->cx.rad, RAD_USER_NAME, ac->user_name) != 0 ||
rad_put_int(r->cx.rad, RAD_SERVICE_TYPE, RAD_FRAMED) != 0 ||
rad_put_int(r->cx.rad, RAD_FRAMED_PROTOCOL, RAD_PPP) != 0 ||
rad_put_addr(r->cx.rad, RAD_FRAMED_IP_ADDRESS, ac->ip) != 0 ||
rad_put_addr(r->cx.rad, RAD_FRAMED_IP_NETMASK, ac->mask) != 0) {
log_Printf(LogERROR, "rad_put: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
if (gethostname(hostname, sizeof hostname) != 0)
log_Printf(LogERROR, "rad_put: gethostname(): %s\n", strerror(errno));
else {
if ((hp = gethostbyname(hostname)) != NULL) {
hostaddr.s_addr = *(u_long *)hp->h_addr;
if (rad_put_addr(r->cx.rad, RAD_NAS_IP_ADDRESS, hostaddr) != 0) {
log_Printf(LogERROR, "rad_put: rad_put_string: %s\n",
rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
}
if (rad_put_string(r->cx.rad, RAD_NAS_IDENTIFIER, hostname) != 0) {
log_Printf(LogERROR, "rad_put: rad_put_string: %s\n",
rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
}
if (dl->physical->handler &&
dl->physical->handler->type == TTY_DEVICE) {
setttyent();
for (slot = 1; (ttyp = getttyent()); ++slot)
if (!strcmp(ttyp->ty_name, dl->physical->name.base)) {
if(rad_put_int(r->cx.rad, RAD_NAS_PORT, slot) != 0) {
log_Printf(LogERROR, "rad_put: rad_put_string: %s\n",
rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
endttyent();
return;
}
break;
}
endttyent();
}
if (rad_put_int(r->cx.rad, RAD_ACCT_STATUS_TYPE, acct_type) != 0 ||
rad_put_string(r->cx.rad, RAD_ACCT_SESSION_ID, ac->session_id) != 0 ||
rad_put_string(r->cx.rad, RAD_ACCT_MULTI_SESSION_ID,
ac->multi_session_id) != 0 ||
rad_put_int(r->cx.rad, RAD_ACCT_DELAY_TIME, 0) != 0) {
/* XXX ACCT_DELAY_TIME should be increased each time a packet is waiting */
log_Printf(LogERROR, "rad_put: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
if (acct_type == RAD_STOP)
/* Show some statistics */
if (rad_put_int(r->cx.rad, RAD_ACCT_INPUT_OCTETS, stats->OctetsIn) != 0 ||
rad_put_int(r->cx.rad, RAD_ACCT_INPUT_PACKETS, stats->PacketsIn) != 0 ||
rad_put_int(r->cx.rad, RAD_ACCT_OUTPUT_OCTETS, stats->OctetsOut) != 0 ||
rad_put_int(r->cx.rad, RAD_ACCT_OUTPUT_PACKETS, stats->PacketsOut)
!= 0 ||
rad_put_int(r->cx.rad, RAD_ACCT_SESSION_TIME, throughput_uptime(stats))
!= 0) {
log_Printf(LogERROR, "rad_put: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
r->cx.auth = NULL; /* Not valid for accounting requests */
if ((got = rad_init_send_request(r->cx.rad, &r->cx.fd, &tv)))
radius_Process(r, got);
else {
log_Printf(LogDEBUG, "Using radius_Timeout [%p]\n", radius_Timeout);
r->cx.timer.load = tv.tv_usec / TICKUNIT + tv.tv_sec * SECTICKS;
r->cx.timer.func = radius_Timeout;
r->cx.timer.name = "radius acct";
r->cx.timer.arg = r;
timer_Start(&r->cx.timer);
}
}
/*
* How do things look at the moment ?
*/
void
radius_Show(struct radius *r, struct prompt *p)
{
prompt_Printf(p, " Radius config: %s",
*r->cfg.file ? r->cfg.file : "none");
if (r->valid) {
prompt_Printf(p, "\n IP: %s\n", inet_ntoa(r->ip));
prompt_Printf(p, " Netmask: %s\n", inet_ntoa(r->mask));
prompt_Printf(p, " MTU: %lu\n", r->mtu);
prompt_Printf(p, " VJ: %sabled\n", r->vj ? "en" : "dis");
if (r->routes)
route_ShowSticky(p, r->routes, " Routes", 16);
} else
prompt_Printf(p, " (not authenticated)\n");
}
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