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freebsd/usr.sbin/ppp/radius.c
Brian Somers 880447787d Add a radius_Flush() function that waits for the response (or timeout) to 
any pending RADIUS transaction.  Use this before sending RAD_STOP RADIUS
messages so that we definitely ``stop'' the session.

It was discovered that sometimes when the link timed out, we got lucky
enough to have an un-ACK'd RADIUS accounting transaction in progress,
resulting in the RAD_STOP message failing to send.

Original report found on:	A russion news group
Text translated by:		glebius
Tested by:			Alexey Popov llp at iteranet dot com
MFC after:			7 days
2005-01-27 14:09:33 +00:00

1339 lines
39 KiB
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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 <stdint.h>
#include <sys/param.h>
#include <sys/select.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"
#include "radlib_vs.h"
#else
#include <radlib.h>
#include <radlib_vs.h>
#endif
#include <errno.h>
#ifndef NODES
#include <md5.h>
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <termios.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 "ncpaddr.h"
#include "ip.h"
#include "ipcp.h"
#include "ipv6cp.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 "ncp.h"
#include "bundle.h"
#include "proto.h"
#ifndef NODES
struct mschap_response {
u_char ident;
u_char flags;
u_char lm_response[24];
u_char nt_response[24];
};
struct mschap2_response {
u_char ident;
u_char flags;
u_char pchallenge[16];
u_char reserved[8];
u_char response[24];
};
#define AUTH_LEN 16
#define SALT_LEN 2
#endif
static const char *
radius_policyname(int policy)
{
switch(policy) {
case MPPE_POLICY_ALLOWED:
return "Allowed";
case MPPE_POLICY_REQUIRED:
return "Required";
}
return NumStr(policy, NULL, 0);
}
static const char *
radius_typesname(int types)
{
switch(types) {
case MPPE_TYPE_40BIT:
return "40 bit";
case MPPE_TYPE_128BIT:
return "128 bit";
case MPPE_TYPE_40BIT|MPPE_TYPE_128BIT:
return "40 or 128 bit";
}
return NumStr(types, NULL, 0);
}
#ifndef NODES
static void
demangle(struct radius *r, const void *mangled, size_t mlen,
char **buf, size_t *len)
{
char R[AUTH_LEN]; /* variable names as per rfc2548 */
const char *S;
u_char b[16];
const u_char *A, *C;
MD5_CTX Context;
int Slen, i, Clen, Ppos;
u_char *P;
if (mlen % 16 != SALT_LEN) {
log_Printf(LogWARN, "Cannot interpret mangled data of length %ld\n",
(u_long)mlen);
*buf = NULL;
*len = 0;
return;
}
/* We need the RADIUS Request-Authenticator */
if (rad_request_authenticator(r->cx.rad, R, sizeof R) != AUTH_LEN) {
log_Printf(LogWARN, "Cannot obtain the RADIUS request authenticator\n");
*buf = NULL;
*len = 0;
return;
}
A = (const u_char *)mangled; /* Salt comes first */
C = (const u_char *)mangled + SALT_LEN; /* Then the ciphertext */
Clen = mlen - SALT_LEN;
S = rad_server_secret(r->cx.rad); /* We need the RADIUS secret */
Slen = strlen(S);
P = alloca(Clen); /* We derive our plaintext */
MD5Init(&Context);
MD5Update(&Context, S, Slen);
MD5Update(&Context, R, AUTH_LEN);
MD5Update(&Context, A, SALT_LEN);
MD5Final(b, &Context);
Ppos = 0;
while (Clen) {
Clen -= 16;
for (i = 0; i < 16; i++)
P[Ppos++] = C[i] ^ b[i];
if (Clen) {
MD5Init(&Context);
MD5Update(&Context, S, Slen);
MD5Update(&Context, C, 16);
MD5Final(b, &Context);
}
C += 16;
}
/*
* The resulting plain text consists of a one-byte length, the text and
* maybe some padding.
*/
*len = *P;
if (*len > mlen - 1) {
log_Printf(LogWARN, "Mangled data seems to be garbage\n");
*buf = NULL;
*len = 0;
return;
}
if ((*buf = malloc(*len)) == NULL) {
log_Printf(LogWARN, "demangle: Out of memory (%lu bytes)\n", (u_long)*len);
*len = 0;
} else
memcpy(*buf, P + 1, *len);
}
#endif
/* XXX: This should go into librarius. */
#ifndef NOINET6
static uint8_t *
rad_cvt_ipv6prefix(const void *data, size_t len)
{
const size_t ipv6len = sizeof(struct in6_addr) + 2;
uint8_t *s;
if (len > ipv6len)
return NULL;
s = malloc(ipv6len);
if (s != NULL) {
memset(s, 0, ipv6len);
memcpy(s, data, len);
}
return s;
}
#endif
/*
* 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, res, width;
size_t len;
struct ncprange dest;
struct ncpaddr gw;
const void *data;
const char *stype;
u_int32_t ipaddr, vendor;
struct in_addr ip;
#ifndef NOINET6
uint8_t ipv6addr[INET6_ADDRSTRLEN];
struct in6_addr ip6;
#endif
r->cx.fd = -1; /* Stop select()ing */
stype = r->cx.auth ? "auth" : "acct";
switch (got) {
case RAD_ACCESS_ACCEPT:
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
"Radius(%s): ACCEPT received\n", stype);
if (!r->cx.auth) {
rad_close(r->cx.rad);
return;
}
break;
case RAD_ACCESS_REJECT:
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
"Radius(%s): REJECT received\n", stype);
if (!r->cx.auth) {
rad_close(r->cx.rad);
return;
}
break;
case RAD_ACCESS_CHALLENGE:
/* we can't deal with this (for now) ! */
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : 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:
/*
* It's probably not ideal to log this at PHASE level as we'll see
* too much stuff going to the log when ``set rad_alive'' is used.
* So we differ from older behaviour (ppp version 3.1 and before)
* and just log accounting responses to LogRADIUS.
*/
log_Printf(LogRADIUS, "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(log_IsKept(LogRADIUS) ? LogRADIUS : 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;
}
/* Let's see what we've got in our reply */
r->ip.s_addr = r->mask.s_addr = INADDR_NONE;
r->mtu = 0;
r->vj = 0;
while ((res = rad_get_attr(r->cx.rad, &data, &len)) > 0) {
switch (res) {
case RAD_FRAMED_IP_ADDRESS:
r->ip = rad_cvt_addr(data);
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" IP %s\n", inet_ntoa(r->ip));
break;
case RAD_FILTER_ID:
free(r->filterid);
if ((r->filterid = rad_cvt_string(data, len)) == NULL) {
log_Printf(LogERROR, "rad_cvt_string: %s\n", rad_strerror(r->cx.rad));
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
}
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" Filter \"%s\"\n", r->filterid);
break;
case RAD_SESSION_TIMEOUT:
r->sessiontime = rad_cvt_int(data);
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" Session-Timeout %lu\n", r->sessiontime);
break;
case RAD_FRAMED_IP_NETMASK:
r->mask = rad_cvt_addr(data);
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" Netmask %s\n", inet_ntoa(r->mask));
break;
case RAD_FRAMED_MTU:
r->mtu = rad_cvt_int(data);
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : 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(log_IsKept(LogRADIUS) ? LogRADIUS : 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));
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
}
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" Route: %s\n", nuke);
bundle = r->cx.auth->physical->dl->bundle;
ip.s_addr = INADDR_ANY;
ncpaddr_setip4(&gw, ip);
ncprange_setip4host(&dest, ip);
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 &&
!ncprange_aton(&dest, &bundle->ncp, argv[0])) ||
!ncpaddr_aton(&gw, &bundle->ncp, argv[1]))
log_Printf(LogWARN, "radius: %s %s: Invalid route\n",
argv[0], argv[1]);
else {
ncprange_getwidth(&dest, &width);
if (width == 32 && strchr(argv[0], '/') == NULL) {
/* No mask specified - use the natural mask */
ncprange_getip4addr(&dest, &ip);
ncprange_setip4mask(&dest, addr2mask(ip));
}
addrs = 0;
if (!strncasecmp(argv[0], "HISADDR", 7))
addrs = ROUTE_DSTHISADDR;
else if (!strncasecmp(argv[0], "MYADDR", 6))
addrs = ROUTE_DSTMYADDR;
if (ncpaddr_getip4addr(&gw, &ipaddr) && ipaddr == INADDR_ANY) {
addrs |= ROUTE_GWHISADDR;
ncpaddr_setip4(&gw, bundle->ncp.ipcp.peer_ip);
} else if (strcasecmp(argv[1], "HISADDR") == 0)
addrs |= ROUTE_GWHISADDR;
route_Add(&r->routes, addrs, &dest, &gw);
}
free(nuke);
break;
case RAD_REPLY_MESSAGE:
free(r->repstr);
if ((r->repstr = rad_cvt_string(data, len)) == NULL) {
log_Printf(LogERROR, "rad_cvt_string: %s\n", rad_strerror(r->cx.rad));
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
}
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" Reply-Message \"%s\"\n", r->repstr);
break;
#ifndef NOINET6
case RAD_FRAMED_IPV6_PREFIX:
free(r->ipv6prefix);
r->ipv6prefix = rad_cvt_ipv6prefix(data, len);
inet_ntop(AF_INET6, &r->ipv6prefix[2], ipv6addr, sizeof(ipv6addr));
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" IPv6 %s/%d\n", ipv6addr, r->ipv6prefix[1]);
break;
case RAD_FRAMED_IPV6_ROUTE:
/*
* We expect a string of the format ``dest[/bits] gw [metrics]''
* Any specified metrics are ignored. MYADDR6 and HISADDR6 are
* understood for ``dest'' and ``gw'' and ``::'' is the same
* as ``HISADDR6''.
*/
if ((nuke = rad_cvt_string(data, len)) == NULL) {
log_Printf(LogERROR, "rad_cvt_string: %s\n", rad_strerror(r->cx.rad));
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
}
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" IPv6 Route: %s\n", nuke);
bundle = r->cx.auth->physical->dl->bundle;
ncpaddr_setip6(&gw, &in6addr_any);
ncprange_set(&dest, &gw, 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 &&
!ncprange_aton(&dest, &bundle->ncp, argv[0])) ||
!ncpaddr_aton(&gw, &bundle->ncp, argv[1]))
log_Printf(LogWARN, "radius: %s %s: Invalid route\n",
argv[0], argv[1]);
else {
addrs = 0;
if (!strncasecmp(argv[0], "HISADDR6", 8))
addrs = ROUTE_DSTHISADDR6;
else if (!strncasecmp(argv[0], "MYADDR6", 7))
addrs = ROUTE_DSTMYADDR6;
if (ncpaddr_getip6(&gw, &ip6) && IN6_IS_ADDR_UNSPECIFIED(&ip6)) {
addrs |= ROUTE_GWHISADDR6;
ncpaddr_copy(&gw, &bundle->ncp.ipv6cp.hisaddr);
} else if (strcasecmp(argv[1], "HISADDR6") == 0)
addrs |= ROUTE_GWHISADDR6;
route_Add(&r->ipv6routes, addrs, &dest, &gw);
}
free(nuke);
break;
#endif
case RAD_VENDOR_SPECIFIC:
if ((res = rad_get_vendor_attr(&vendor, &data, &len)) <= 0) {
log_Printf(LogERROR, "rad_get_vendor_attr: %s (failing!)\n",
rad_strerror(r->cx.rad));
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
}
switch (vendor) {
case RAD_VENDOR_MICROSOFT:
switch (res) {
#ifndef NODES
case RAD_MICROSOFT_MS_CHAP_ERROR:
free(r->errstr);
if (len == 0)
r->errstr = NULL;
else {
if (len < 3 || ((const char *)data)[1] != '=') {
/*
* Only point at the String field if we don't think the
* peer has misformatted the response.
*/
data = (const char *)data + 1;
len--;
} else
log_Printf(LogWARN, "Warning: The MS-CHAP-Error "
"attribute is mis-formatted. Compensating\n");
if ((r->errstr = rad_cvt_string((const char *)data,
len)) == NULL) {
log_Printf(LogERROR, "rad_cvt_string: %s\n",
rad_strerror(r->cx.rad));
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
}
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" MS-CHAP-Error \"%s\"\n", r->errstr);
}
break;
case RAD_MICROSOFT_MS_CHAP2_SUCCESS:
free(r->msrepstr);
if (len == 0)
r->msrepstr = NULL;
else {
if (len < 3 || ((const char *)data)[1] != '=') {
/*
* Only point at the String field if we don't think the
* peer has misformatted the response.
*/
data = (const char *)data + 1;
len--;
} else
log_Printf(LogWARN, "Warning: The MS-CHAP2-Success "
"attribute is mis-formatted. Compensating\n");
if ((r->msrepstr = rad_cvt_string((const char *)data,
len)) == NULL) {
log_Printf(LogERROR, "rad_cvt_string: %s\n",
rad_strerror(r->cx.rad));
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
}
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" MS-CHAP2-Success \"%s\"\n", r->msrepstr);
}
break;
case RAD_MICROSOFT_MS_MPPE_ENCRYPTION_POLICY:
r->mppe.policy = rad_cvt_int(data);
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" MS-MPPE-Encryption-Policy %s\n",
radius_policyname(r->mppe.policy));
break;
case RAD_MICROSOFT_MS_MPPE_ENCRYPTION_TYPES:
r->mppe.types = rad_cvt_int(data);
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" MS-MPPE-Encryption-Types %s\n",
radius_typesname(r->mppe.types));
break;
case RAD_MICROSOFT_MS_MPPE_RECV_KEY:
free(r->mppe.recvkey);
demangle(r, data, len, &r->mppe.recvkey, &r->mppe.recvkeylen);
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" MS-MPPE-Recv-Key ********\n");
break;
case RAD_MICROSOFT_MS_MPPE_SEND_KEY:
demangle(r, data, len, &r->mppe.sendkey, &r->mppe.sendkeylen);
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : LogPHASE,
" MS-MPPE-Send-Key ********\n");
break;
#endif
default:
log_Printf(LogDEBUG, "Dropping MICROSOFT vendor specific "
"RADIUS attribute %d\n", res);
break;
}
break;
default:
log_Printf(LogDEBUG, "Dropping vendor %lu RADIUS attribute %d\n",
(unsigned long)vendor, res);
break;
}
break;
default:
log_Printf(LogDEBUG, "Dropping RADIUS attribute %d\n", res);
break;
}
}
if (res == -1) {
log_Printf(LogERROR, "rad_get_attr: %s (failing!)\n",
rad_strerror(r->cx.rad));
auth_Failure(r->cx.auth);
} else if (got == RAD_ACCESS_REJECT)
auth_Failure(r->cx.auth);
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(log_IsKept(LogRADIUS) ? LogRADIUS : 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 __unused,
const fd_set *fdset __unused)
{
radius_Continue(descriptor2radius(d), 1);
}
/*
* Flush any pending transactions
*/
void
radius_Flush(struct radius *r)
{
struct timeval tv;
fd_set s;
while (r->cx.fd != -1) {
FD_ZERO(&s);
FD_SET(r->cx.fd, &s);
tv.tv_sec = 0;
tv.tv_usec = TICKUNIT;
select(r->cx.fd + 1, &s, NULL, NULL, &tv);
radius_Continue(r, 1);
}
}
/*
* Behave as a struct fdescriptor (descriptor.h)
*/
static int
radius_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w __unused,
fd_set *e __unused, 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 __unused, struct bundle *bundle __unused,
const fd_set *fdset __unused)
{
/* 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->desc.type = RADIUS_DESCRIPTOR;
r->desc.UpdateSet = radius_UpdateSet;
r->desc.IsSet = radius_IsSet;
r->desc.Read = radius_Read;
r->desc.Write = radius_Write;
r->cx.fd = -1;
r->cx.rad = NULL;
memset(&r->cx.timer, '\0', sizeof r->cx.timer);
r->cx.auth = NULL;
r->valid = 0;
r->vj = 0;
r->ip.s_addr = INADDR_ANY;
r->mask.s_addr = INADDR_NONE;
r->routes = NULL;
r->mtu = DEF_MTU;
r->msrepstr = NULL;
r->repstr = NULL;
#ifndef NOINET6
r->ipv6prefix = NULL;
r->ipv6routes = NULL;
#endif
r->errstr = NULL;
r->mppe.policy = 0;
r->mppe.types = 0;
r->mppe.recvkey = NULL;
r->mppe.recvkeylen = 0;
r->mppe.sendkey = NULL;
r->mppe.sendkeylen = 0;
*r->cfg.file = '\0';;
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);
#ifndef NOINET6
route_DeleteAll(&r->ipv6routes);
#endif
free(r->filterid);
r->filterid = NULL;
free(r->msrepstr);
r->msrepstr = NULL;
free(r->repstr);
r->repstr = NULL;
#ifndef NOINET6
free(r->ipv6prefix);
r->ipv6prefix = NULL;
#endif
free(r->errstr);
r->errstr = NULL;
free(r->mppe.recvkey);
r->mppe.recvkey = NULL;
r->mppe.recvkeylen = 0;
free(r->mppe.sendkey);
r->mppe.sendkey = NULL;
r->mppe.sendkeylen = 0;
if (r->cx.fd != -1) {
r->cx.fd = -1;
rad_close(r->cx.rad);
}
}
static int
radius_put_physical_details(struct rad_handle *rad, struct physical *p)
{
int slot, type;
type = RAD_VIRTUAL;
if (p->handler)
switch (p->handler->type) {
case I4B_DEVICE:
type = RAD_ISDN_SYNC;
break;
case TTY_DEVICE:
type = RAD_ASYNC;
break;
case ETHER_DEVICE:
type = RAD_ETHERNET;
break;
case TCP_DEVICE:
case UDP_DEVICE:
case EXEC_DEVICE:
case ATM_DEVICE:
case NG_DEVICE:
type = RAD_VIRTUAL;
break;
}
if (rad_put_int(rad, RAD_NAS_PORT_TYPE, type) != 0) {
log_Printf(LogERROR, "rad_put: rad_put_int: %s\n", rad_strerror(rad));
rad_close(rad);
return 0;
}
if ((slot = physical_Slot(p)) >= 0)
if (rad_put_int(rad, RAD_NAS_PORT, slot) != 0) {
log_Printf(LogERROR, "rad_put: rad_put_int: %s\n", rad_strerror(rad));
rad_close(rad);
return 0;
}
return 1;
}
/*
* Start an authentication request to the RADIUS server.
*/
int
radius_Authenticate(struct radius *r, struct authinfo *authp, const char *name,
const char *key, int klen, const char *nchallenge,
int nclen)
{
char hostname[MAXHOSTNAMELEN];
struct timeval tv;
const char *what = "questionable"; /* silence warnings! */
char *mac_addr;
int got;
struct hostent *hp;
struct in_addr hostaddr;
#ifndef NODES
struct mschap_response msresp;
struct mschap2_response msresp2;
const struct MSCHAPv2_resp *keyv2;
#endif
if (!*r->cfg.file)
return 0;
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 1;
radius_Destroy(r);
if ((r->cx.rad = rad_auth_open()) == NULL) {
log_Printf(LogERROR, "rad_auth_open: %s\n", strerror(errno));
return 0;
}
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 0;
}
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 0;
}
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 0;
}
switch (authp->physical->link.lcp.want_auth) {
case PROTO_PAP:
/* We're talking PAP */
if (rad_put_attr(r->cx.rad, RAD_USER_PASSWORD, key, klen) != 0) {
log_Printf(LogERROR, "PAP: rad_put_string: %s\n",
rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return 0;
}
what = "PAP";
break;
case PROTO_CHAP:
switch (authp->physical->link.lcp.want_authtype) {
case 0x5:
if (rad_put_attr(r->cx.rad, RAD_CHAP_PASSWORD, key, klen) != 0 ||
rad_put_attr(r->cx.rad, RAD_CHAP_CHALLENGE, nchallenge, nclen) != 0) {
log_Printf(LogERROR, "CHAP: rad_put_string: %s\n",
rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return 0;
}
what = "CHAP";
break;
#ifndef NODES
case 0x80:
if (klen != 50) {
log_Printf(LogERROR, "CHAP80: Unrecognised key length %d\n", klen);
rad_close(r->cx.rad);
return 0;
}
rad_put_vendor_attr(r->cx.rad, RAD_VENDOR_MICROSOFT,
RAD_MICROSOFT_MS_CHAP_CHALLENGE, nchallenge, nclen);
msresp.ident = *key;
msresp.flags = 0x01;
memcpy(msresp.lm_response, key + 1, 24);
memcpy(msresp.nt_response, key + 25, 24);
rad_put_vendor_attr(r->cx.rad, RAD_VENDOR_MICROSOFT,
RAD_MICROSOFT_MS_CHAP_RESPONSE, &msresp,
sizeof msresp);
what = "MSCHAP";
break;
case 0x81:
if (klen != sizeof(*keyv2) + 1) {
log_Printf(LogERROR, "CHAP81: Unrecognised key length %d\n", klen);
rad_close(r->cx.rad);
return 0;
}
keyv2 = (const struct MSCHAPv2_resp *)(key + 1);
rad_put_vendor_attr(r->cx.rad, RAD_VENDOR_MICROSOFT,
RAD_MICROSOFT_MS_CHAP_CHALLENGE, nchallenge, nclen);
msresp2.ident = *key;
msresp2.flags = keyv2->Flags;
memcpy(msresp2.response, keyv2->NTResponse, sizeof msresp2.response);
memset(msresp2.reserved, '\0', sizeof msresp2.reserved);
memcpy(msresp2.pchallenge, keyv2->PeerChallenge,
sizeof msresp2.pchallenge);
rad_put_vendor_attr(r->cx.rad, RAD_VENDOR_MICROSOFT,
RAD_MICROSOFT_MS_CHAP2_RESPONSE, &msresp2,
sizeof msresp2);
what = "MSCHAPv2";
break;
#endif
default:
log_Printf(LogERROR, "CHAP: Unrecognised type 0x%02x\n",
authp->physical->link.lcp.want_authtype);
rad_close(r->cx.rad);
return 0;
}
}
if (gethostname(hostname, sizeof hostname) != 0)
log_Printf(LogERROR, "rad_put: gethostname(): %s\n", strerror(errno));
else {
if (Enabled(authp->physical->dl->bundle, OPT_NAS_IP_ADDRESS) &&
(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 0;
}
}
if (Enabled(authp->physical->dl->bundle, OPT_NAS_IDENTIFIER) &&
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 0;
}
}
if ((mac_addr = getenv("HISMACADDR")) != NULL &&
rad_put_string(r->cx.rad, RAD_CALLING_STATION_ID, mac_addr) != 0) {
log_Printf(LogERROR, "rad_put: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return 0;
}
radius_put_physical_details(r->cx.rad, authp->physical);
log_Printf(LogRADIUS, "Radius(auth): %s data sent for %s\n", what, name);
r->cx.auth = authp;
if ((got = rad_init_send_request(r->cx.rad, &r->cx.fd, &tv)))
radius_Process(r, got);
else {
log_Printf(log_IsKept(LogRADIUS) ? LogRADIUS : 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);
}
return 1;
}
/* Fetch IP, netmask from IPCP */
void
radius_Account_Set_Ip(struct radacct *ac, struct in_addr *peer_ip,
struct in_addr *netmask)
{
ac->proto = PROTO_IPCP;
memcpy(&ac->peer.ip.addr, peer_ip, sizeof(ac->peer.ip.addr));
memcpy(&ac->peer.ip.mask, netmask, sizeof(ac->peer.ip.mask));
}
#ifndef NOINET6
/* Fetch interface-id from IPV6CP */
void
radius_Account_Set_Ipv6(struct radacct *ac, u_char *ifid)
{
ac->proto = PROTO_IPV6CP;
memcpy(&ac->peer.ipv6.ifid, ifid, sizeof(ac->peer.ipv6.ifid));
}
#endif
/*
* Send an accounting request to the RADIUS server
*/
void
radius_Account(struct radius *r, struct radacct *ac, struct datalink *dl,
int acct_type, struct pppThroughput *stats)
{
struct timeval tv;
int got;
char hostname[MAXHOSTNAMELEN];
char *mac_addr;
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;
timer_Stop(&r->cx.timer);
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%ld-%s%lu",
dl->bundle->cfg.auth.name, (long)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 : "");
};
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) {
log_Printf(LogERROR, "rad_put: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
switch (ac->proto) {
case PROTO_IPCP:
if (rad_put_addr(r->cx.rad, RAD_FRAMED_IP_ADDRESS,
ac->peer.ip.addr) != 0 ||
rad_put_addr(r->cx.rad, RAD_FRAMED_IP_NETMASK,
ac->peer.ip.mask) != 0) {
log_Printf(LogERROR, "rad_put: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
break;
#ifndef NOINET6
case PROTO_IPV6CP:
if (rad_put_attr(r->cx.rad, RAD_FRAMED_INTERFACE_ID, ac->peer.ipv6.ifid,
sizeof(ac->peer.ipv6.ifid)) != 0) {
log_Printf(LogERROR, "rad_put_attr: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
if (r->ipv6prefix) {
/*
* Since PPP doesn't delegate an IPv6 prefix to a peer,
* Framed-IPv6-Prefix may be not used, actually.
*/
if (rad_put_attr(r->cx.rad, RAD_FRAMED_IPV6_PREFIX, r->ipv6prefix,
sizeof(struct in6_addr) + 2) != 0) {
log_Printf(LogERROR, "rad_put_attr: %s\n", rad_strerror(r->cx.rad));
rad_close(r->cx.rad);
return;
}
}
break;
#endif
default:
/* We don't log any protocol specific information */
break;
}
if ((mac_addr = getenv("HISMACADDR")) != NULL &&
rad_put_string(r->cx.rad, RAD_CALLING_STATION_ID, mac_addr) != 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 (Enabled(dl->bundle, OPT_NAS_IP_ADDRESS) &&
(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 (Enabled(dl->bundle, OPT_NAS_IDENTIFIER) &&
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;
}
}
radius_put_physical_details(r->cx.rad, dl->physical);
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 || acct_type == RAD_ALIVE)
/* Show some statistics */
if (rad_put_int(r->cx.rad, RAD_ACCT_INPUT_OCTETS, stats->OctetsIn % UINT32_MAX) != 0 ||
rad_put_int(r->cx.rad, RAD_ACCT_INPUT_GIGAWORDS, stats->OctetsIn / UINT32_MAX) != 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 % UINT32_MAX) != 0 ||
rad_put_int(r->cx.rad, RAD_ACCT_OUTPUT_GIGAWORDS, stats->OctetsOut / UINT32_MAX) != 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;
}
if (log_IsKept(LogPHASE) || log_IsKept(LogRADIUS)) {
const char *what;
int level;
switch (acct_type) {
case RAD_START:
what = "START";
level = log_IsKept(LogPHASE) ? LogPHASE : LogRADIUS;
break;
case RAD_STOP:
what = "STOP";
level = log_IsKept(LogPHASE) ? LogPHASE : LogRADIUS;
break;
case RAD_ALIVE:
what = "ALIVE";
level = LogRADIUS;
break;
default:
what = "<unknown>";
level = log_IsKept(LogPHASE) ? LogPHASE : LogRADIUS;
break;
}
log_Printf(level, "Radius(acct): %s data sent\n", what);
}
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");
prompt_Printf(p, " Message: %s\n", r->repstr ? r->repstr : "");
prompt_Printf(p, " MPPE Enc Policy: %s\n",
radius_policyname(r->mppe.policy));
prompt_Printf(p, " MPPE Enc Types: %s\n",
radius_typesname(r->mppe.types));
prompt_Printf(p, " MPPE Recv Key: %seceived\n",
r->mppe.recvkey ? "R" : "Not r");
prompt_Printf(p, " MPPE Send Key: %seceived\n",
r->mppe.sendkey ? "R" : "Not r");
prompt_Printf(p, " MS-CHAP2-Response: %s\n",
r->msrepstr ? r->msrepstr : "");
prompt_Printf(p, " Error Message: %s\n", r->errstr ? r->errstr : "");
if (r->routes)
route_ShowSticky(p, r->routes, " Routes", 16);
#ifndef NOINET6
if (r->ipv6routes)
route_ShowSticky(p, r->ipv6routes, " IPv6 Routes", 16);
#endif
} else
prompt_Printf(p, " (not authenticated)\n");
}
static void
radius_alive(void *v)
{
struct bundle *bundle = (struct bundle *)v;
timer_Stop(&bundle->radius.alive.timer);
bundle->radius.alive.timer.load = bundle->radius.alive.interval * SECTICKS;
if (bundle->radius.alive.timer.load) {
radius_Account(&bundle->radius, &bundle->radacct,
bundle->links, RAD_ALIVE, &bundle->ncp.ipcp.throughput);
timer_Start(&bundle->radius.alive.timer);
}
}
void
radius_StartTimer(struct bundle *bundle)
{
if (bundle->radius.cfg.file && bundle->radius.alive.interval) {
bundle->radius.alive.timer.func = radius_alive;
bundle->radius.alive.timer.name = "radius alive";
bundle->radius.alive.timer.load = bundle->radius.alive.interval * SECTICKS;
bundle->radius.alive.timer.arg = bundle;
radius_alive(bundle);
}
}
void
radius_StopTimer(struct radius *r)
{
timer_Stop(&r->alive.timer);
}
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