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freebsd/usr.sbin/ppp/radius.c
Pedro F. Giffuni 1de7b4b805 various: general adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:37:16 +00:00

1364 lines
39 KiB
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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"
#include "iface.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);
if ((r->ipv6prefix = rad_cvt_ipv6prefix(data, len)) == NULL) {
log_Printf(LogERROR, "rad_cvt_ipv6prefix: %s\n",
"Malformed attribute in response");
auth_Failure(r->cx.auth);
rad_close(r->cx.rad);
return;
}
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 radius *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->cx.rad, RAD_NAS_PORT_TYPE, type) != 0) {
log_Printf(LogERROR, "rad_put: rad_put_int: %s\n", rad_strerror(rad->cx.rad));
rad_close(rad->cx.rad);
return 0;
}
switch (rad->port_id_type) {
case RPI_PID:
slot = (int)getpid();
break;
case RPI_IFNUM:
slot = p->dl->bundle->iface->index;
break;
case RPI_TUNNUM:
slot = p->dl->bundle->unit;
break;
case RPI_DEFAULT:
default:
slot = physical_Slot(p);
break;
}
if (slot >= 0)
if (rad_put_int(rad->cx.rad, RAD_NAS_PORT, slot) != 0) {
log_Printf(LogERROR, "rad_put: rad_put_int: %s\n", rad_strerror(rad->cx.rad));
rad_close(rad->cx.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, 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, 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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