/***********************************************************************
*
* radius.c
*
* RADIUS plugin for pppd. Performs PAP, CHAP, MS-CHAP, MS-CHAPv2
* authentication using RADIUS.
*
* Copyright (C) 2002 Roaring Penguin Software Inc.
*
* Based on a patch for ipppd, which is:
* Copyright (C) 1996, Matjaz Godec <gody@elgo.si>
* Copyright (C) 1996, Lars Fenneberg <in5y050@public.uni-hamburg.de>
* Copyright (C) 1997, Miguel A.L. Paraz <map@iphil.net>
*
* Uses radiusclient library, which is:
* Copyright (C) 1995,1996,1997,1998 Lars Fenneberg <lf@elemental.net>
* Copyright (C) 2002 Roaring Penguin Software Inc.
*
* MPPE support is by Ralf Hofmann, <ralf.hofmann@elvido.net>, with
* modification from Frank Cusack, <frank@google.com>.
*
* This plugin may be distributed according to the terms of the GNU
* General Public License, version 2 or (at your option) any later version.
*
***********************************************************************/
static char const RCSID[] =
"$Id: radius.c,v 1.32 2008/05/26 09:18:08 paulus Exp $";
#include "pppd.h"
#include "chap-new.h"
#ifdef CHAPMS
#include "chap_ms.h"
#ifdef MPPE
#include "md5.h"
#endif
#endif
#include "radiusclient.h"
#include "fsm.h"
#include "ipcp.h"
#include <syslog.h>
#include <sys/types.h>
#include <sys/time.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#define BUF_LEN 1024
#define MD5_HASH_SIZE 16
#define MSDNS 1
static char *config_file = NULL;
static int add_avp(char **);
static struct avpopt {
char *vpstr;
struct avpopt *next;
} *avpopt = NULL;
static bool portnummap = 0;
static option_t Options[] = {
{ "radius-config-file", o_string, &config_file },
{ "avpair", o_special, add_avp },
{ "map-to-ttyname", o_bool, &portnummap,
"Set Radius NAS-Port attribute value via libradiusclient library", OPT_PRIO | 1 },
{ "map-to-ifname", o_bool, &portnummap,
"Set Radius NAS-Port attribute to number as in interface name (Default)", OPT_PRIOSUB | 0 },
{ NULL }
};
static int radius_secret_check(void);
static int radius_pap_auth(char *user,
char *passwd,
char **msgp,
struct wordlist **paddrs,
struct wordlist **popts);
static int radius_chap_verify(char *user, char *ourname, int id,
struct chap_digest_type *digest,
unsigned char *challenge,
unsigned char *response,
char *message, int message_space);
static void radius_ip_up(void *opaque, int arg);
static void radius_ip_down(void *opaque, int arg);
static void make_username_realm(char *user);
static int radius_setparams(VALUE_PAIR *vp, char *msg, REQUEST_INFO *req_info,
struct chap_digest_type *digest,
unsigned char *challenge,
char *message, int message_space);
static void radius_choose_ip(u_int32_t *addrp);
static int radius_init(char *msg);
static int get_client_port(char *ifname);
static int radius_allowed_address(u_int32_t addr);
static void radius_acct_interim(void *);
#ifdef MPPE
static int radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info,
unsigned char *);
static int radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info);
#endif
#ifndef MAXSESSIONID
#define MAXSESSIONID 32
#endif
#ifndef MAXCLASSLEN
#define MAXCLASSLEN 500
#endif
struct radius_state {
int accounting_started;
int initialized;
int client_port;
int choose_ip;
int any_ip_addr_ok;
int done_chap_once;
u_int32_t ip_addr;
char user[MAXNAMELEN];
char config_file[MAXPATHLEN];
char session_id[MAXSESSIONID + 1];
time_t start_time;
int acct_interim_interval;
SERVER *authserver; /* Authentication server to use */
SERVER *acctserver; /* Accounting server to use */
int class_len;
char class[MAXCLASSLEN];
VALUE_PAIR *avp; /* Additional (user supplied) vp's to send to server */
};
void (*radius_attributes_hook)(VALUE_PAIR *) = NULL;
/* The pre_auth_hook MAY set authserver and acctserver if it wants.
In that case, they override the values in the radiusclient.conf file */
void (*radius_pre_auth_hook)(char const *user,
SERVER **authserver,
SERVER **acctserver) = NULL;
static struct radius_state rstate;
char pppd_version[] = VERSION;
/**********************************************************************
* %FUNCTION: plugin_init
* %ARGUMENTS:
* None
* %RETURNS:
* Nothing
* %DESCRIPTION:
* Initializes RADIUS plugin.
***********************************************************************/
void
plugin_init(void)
{
pap_check_hook = radius_secret_check;
pap_auth_hook = radius_pap_auth;
chap_check_hook = radius_secret_check;
chap_verify_hook = radius_chap_verify;
ip_choose_hook = radius_choose_ip;
allowed_address_hook = radius_allowed_address;
add_notifier(&ip_up_notifier, radius_ip_up, NULL);
add_notifier(&ip_down_notifier, radius_ip_down, NULL);
memset(&rstate, 0, sizeof(rstate));
strlcpy(rstate.config_file, "/etc/radiusclient/radiusclient.conf",
sizeof(rstate.config_file));
add_options(Options);
info("RADIUS plugin initialized.");
}
/**********************************************************************
* %FUNCTION: add_avp
* %ARGUMENTS:
* argv -- the <attribute=value> pair to add
* %RETURNS:
* 1
* %DESCRIPTION:
* Adds an av pair to be passed on to the RADIUS server on each request.
***********************************************************************/
static int
add_avp(char **argv)
{
struct avpopt *p = malloc(sizeof(struct avpopt));
/* Append to a list of vp's for later parsing */
p->vpstr = strdup(*argv);
p->next = avpopt;
avpopt = p;
return 1;
}
/**********************************************************************
* %FUNCTION: radius_secret_check
* %ARGUMENTS:
* None
* %RETURNS:
* 1 -- we are ALWAYS willing to supply a secret. :-)
* %DESCRIPTION:
* Tells pppd that we will try to authenticate the peer, and not to
* worry about looking in /etc/ppp/*-secrets
***********************************************************************/
static int
radius_secret_check(void)
{
return 1;
}
/**********************************************************************
* %FUNCTION: radius_choose_ip
* %ARGUMENTS:
* addrp -- where to store the IP address
* %RETURNS:
* Nothing
* %DESCRIPTION:
* If RADIUS server has specified an IP address, it is stored in *addrp.
***********************************************************************/
static void
radius_choose_ip(u_int32_t *addrp)
{
if (rstate.choose_ip) {
*addrp = rstate.ip_addr;
}
}
/**********************************************************************
* %FUNCTION: radius_pap_auth
* %ARGUMENTS:
* user -- user-name of peer
* passwd -- password supplied by peer
* msgp -- Message which will be sent in PAP response
* paddrs -- set to a list of possible peer IP addresses
* popts -- set to a list of additional pppd options
* %RETURNS:
* 1 if we can authenticate, -1 if we cannot.
* %DESCRIPTION:
* Performs PAP authentication using RADIUS
***********************************************************************/
static int
radius_pap_auth(char *user,
char *passwd,
char **msgp,
struct wordlist **paddrs,
struct wordlist **popts)
{
VALUE_PAIR *send, *received;
UINT4 av_type;
int result;
static char radius_msg[BUF_LEN];
radius_msg[0] = 0;
*msgp = radius_msg;
if (radius_init(radius_msg) < 0) {
return 0;
}
/* Put user with potentially realm added in rstate.user */
make_username_realm(user);
if (radius_pre_auth_hook) {
radius_pre_auth_hook(rstate.user,
&rstate.authserver,
&rstate.acctserver);
}
send = NULL;
received = NULL;
/* Hack... the "port" is the ppp interface number. Should really be
the tty */
rstate.client_port = get_client_port(portnummap ? devnam : ifname);
av_type = PW_FRAMED;
rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
av_type = PW_PPP;
rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
rc_avpair_add(&send, PW_USER_NAME, rstate.user , 0, VENDOR_NONE);
rc_avpair_add(&send, PW_USER_PASSWORD, passwd, 0, VENDOR_NONE);
if (*remote_number) {
rc_avpair_add(&send, PW_CALLING_STATION_ID, remote_number, 0,
VENDOR_NONE);
} else if (ipparam)
rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
/* Add user specified vp's */
if (rstate.avp)
rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
if (rstate.authserver) {
result = rc_auth_using_server(rstate.authserver,
rstate.client_port, send,
&received, radius_msg, NULL);
} else {
result = rc_auth(rstate.client_port, send, &received, radius_msg, NULL);
}
if (result == OK_RC) {
if (radius_setparams(received, radius_msg, NULL, NULL, NULL, NULL, 0) < 0) {
result = ERROR_RC;
}
}
/* free value pairs */
rc_avpair_free(received);
rc_avpair_free(send);
return (result == OK_RC) ? 1 : 0;
}
/**********************************************************************
* %FUNCTION: radius_chap_verify
* %ARGUMENTS:
* user -- name of the peer
* ourname -- name for this machine
* id -- the ID byte in the challenge
* digest -- points to the structure representing the digest type
* challenge -- the challenge string we sent (length in first byte)
* response -- the response (hash) the peer sent back (length in 1st byte)
* message -- space for a message to be returned to the peer
* message_space -- number of bytes available at *message.
* %RETURNS:
* 1 if the response is good, 0 if it is bad
* %DESCRIPTION:
* Performs CHAP, MS-CHAP and MS-CHAPv2 authentication using RADIUS.
***********************************************************************/
static int
radius_chap_verify(char *user, char *ourname, int id,
struct chap_digest_type *digest,
unsigned char *challenge, unsigned char *response,
char *message, int message_space)
{
VALUE_PAIR *send, *received;
UINT4 av_type;
static char radius_msg[BUF_LEN];
int result;
int challenge_len, response_len;
u_char cpassword[MAX_RESPONSE_LEN + 1];
#ifdef MPPE
/* Need the RADIUS secret and Request Authenticator to decode MPPE */
REQUEST_INFO request_info, *req_info = &request_info;
#else
REQUEST_INFO *req_info = NULL;
#endif
challenge_len = *challenge++;
response_len = *response++;
radius_msg[0] = 0;
if (radius_init(radius_msg) < 0) {
error("%s", radius_msg);
return 0;
}
/* return error for types we can't handle */
if ((digest->code != CHAP_MD5)
#ifdef CHAPMS
&& (digest->code != CHAP_MICROSOFT)
&& (digest->code != CHAP_MICROSOFT_V2)
#endif
) {
error("RADIUS: Challenge type %u unsupported", digest->code);
return 0;
}
/* Put user with potentially realm added in rstate.user */
if (!rstate.done_chap_once) {
make_username_realm(user);
rstate.client_port = get_client_port (portnummap ? devnam : ifname);
if (radius_pre_auth_hook) {
radius_pre_auth_hook(rstate.user,
&rstate.authserver,
&rstate.acctserver);
}
}
send = received = NULL;
av_type = PW_FRAMED;
rc_avpair_add (&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
av_type = PW_PPP;
rc_avpair_add (&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
rc_avpair_add (&send, PW_USER_NAME, rstate.user , 0, VENDOR_NONE);
/*
* add the challenge and response fields
*/
switch (digest->code) {
case CHAP_MD5:
/* CHAP-Challenge and CHAP-Password */
if (response_len != MD5_HASH_SIZE)
return 0;
cpassword[0] = id;
memcpy(&cpassword[1], response, MD5_HASH_SIZE);
rc_avpair_add(&send, PW_CHAP_CHALLENGE,
challenge, challenge_len, VENDOR_NONE);
rc_avpair_add(&send, PW_CHAP_PASSWORD,
cpassword, MD5_HASH_SIZE + 1, VENDOR_NONE);
break;
#ifdef CHAPMS
case CHAP_MICROSOFT:
{
/* MS-CHAP-Challenge and MS-CHAP-Response */
u_char *p = cpassword;
if (response_len != MS_CHAP_RESPONSE_LEN)
return 0;
*p++ = id;
/* The idiots use a different field order in RADIUS than PPP */
*p++ = response[MS_CHAP_USENT];
memcpy(p, response, MS_CHAP_LANMANRESP_LEN + MS_CHAP_NTRESP_LEN);
rc_avpair_add(&send, PW_MS_CHAP_CHALLENGE,
challenge, challenge_len, VENDOR_MICROSOFT);
rc_avpair_add(&send, PW_MS_CHAP_RESPONSE,
cpassword, MS_CHAP_RESPONSE_LEN + 1, VENDOR_MICROSOFT);
break;
}
case CHAP_MICROSOFT_V2:
{
/* MS-CHAP-Challenge and MS-CHAP2-Response */
u_char *p = cpassword;
if (response_len != MS_CHAP2_RESPONSE_LEN)
return 0;
*p++ = id;
/* The idiots use a different field order in RADIUS than PPP */
*p++ = response[MS_CHAP2_FLAGS];
memcpy(p, response, (MS_CHAP2_PEER_CHAL_LEN + MS_CHAP2_RESERVED_LEN
+ MS_CHAP2_NTRESP_LEN));
rc_avpair_add(&send, PW_MS_CHAP_CHALLENGE,
challenge, challenge_len, VENDOR_MICROSOFT);
rc_avpair_add(&send, PW_MS_CHAP2_RESPONSE,
cpassword, MS_CHAP2_RESPONSE_LEN + 1, VENDOR_MICROSOFT);
break;
}
#endif
}
if (*remote_number) {
rc_avpair_add(&send, PW_CALLING_STATION_ID, remote_number, 0,
VENDOR_NONE);
} else if (ipparam)
rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
/* Add user specified vp's */
if (rstate.avp)
rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
/*
* make authentication with RADIUS server
*/
if (rstate.authserver) {
result = rc_auth_using_server(rstate.authserver,
rstate.client_port, send,
&received, radius_msg, req_info);
} else {
result = rc_auth(rstate.client_port, send, &received, radius_msg,
req_info);
}
strlcpy(message, radius_msg, message_space);
if (result == OK_RC) {
if (!rstate.done_chap_once) {
if (radius_setparams(received, radius_msg, req_info, digest,
challenge, message, message_space) < 0) {
error("%s", radius_msg);
result = ERROR_RC;
} else {
rstate.done_chap_once = 1;
}
}
}
rc_avpair_free(received);
rc_avpair_free (send);
return (result == OK_RC);
}
/**********************************************************************
* %FUNCTION: make_username_realm
* %ARGUMENTS:
* user -- the user given to pppd
* %RETURNS:
* Nothing
* %DESCRIPTION:
* Copies user into rstate.user. If it lacks a realm (no "@domain" part),
* then the default realm from the radiusclient config file is added.
***********************************************************************/
static void
make_username_realm(char *user)
{
char *default_realm;
if ( user != NULL ) {
strlcpy(rstate.user, user, sizeof(rstate.user));
} else {
rstate.user[0] = 0;
}
default_realm = rc_conf_str("default_realm");
if (!strchr(rstate.user, '@') &&
default_realm &&
(*default_realm != '\0')) {
strlcat(rstate.user, "@", sizeof(rstate.user));
strlcat(rstate.user, default_realm, sizeof(rstate.user));
}
}
/**********************************************************************
* %FUNCTION: radius_setparams
* %ARGUMENTS:
* vp -- received value-pairs
* msg -- buffer in which to place error message. Holds up to BUF_LEN chars
* %RETURNS:
* >= 0 on success; -1 on failure
* %DESCRIPTION:
* Parses attributes sent by RADIUS server and sets them in pppd.
***********************************************************************/
static int
radius_setparams(VALUE_PAIR *vp, char *msg, REQUEST_INFO *req_info,
struct chap_digest_type *digest, unsigned char *challenge,
char *message, int message_space)
{
u_int32_t remote;
int ms_chap2_success = 0;
#ifdef MPPE
int mppe_enc_keys = 0; /* whether or not these were received */
int mppe_enc_policy = 0;
int mppe_enc_types = 0;
#endif
#ifdef MSDNS
ipcp_options *wo = &ipcp_wantoptions[0];
ipcp_options *ao = &ipcp_allowoptions[0];
int got_msdns_1 = 0;
int got_msdns_2 = 0;
int got_wins_1 = 0;
int got_wins_2 = 0;
#endif
/* Send RADIUS attributes to anyone else who might be interested */
if (radius_attributes_hook) {
(*radius_attributes_hook)(vp);
}
/*
* service type (if not framed then quit),
* new IP address (RADIUS can define static IP for some users),
*/
while (vp) {
if (vp->vendorcode == VENDOR_NONE) {
switch (vp->attribute) {
case PW_SERVICE_TYPE:
/* check for service type */
/* if not FRAMED then exit */
if (vp->lvalue != PW_FRAMED) {
slprintf(msg, BUF_LEN, "RADIUS: wrong service type %ld for %s",
vp->lvalue, rstate.user);
return -1;
}
break;
case PW_FRAMED_PROTOCOL:
/* check for framed protocol type */
/* if not PPP then also exit */
if (vp->lvalue != PW_PPP) {
slprintf(msg, BUF_LEN, "RADIUS: wrong framed protocol %ld for %s",
vp->lvalue, rstate.user);
return -1;
}
break;
case PW_SESSION_TIMEOUT:
/* Session timeout */
maxconnect = vp->lvalue;
break;
case PW_FILTER_ID:
/* packet filter, will be handled via ip-(up|down) script */
script_setenv("RADIUS_FILTER_ID", vp->strvalue, 1);
break;
case PW_FRAMED_ROUTE:
/* route, will be handled via ip-(up|down) script */
script_setenv("RADIUS_FRAMED_ROUTE", vp->strvalue, 1);
break;
case PW_IDLE_TIMEOUT:
/* idle parameter */
idle_time_limit = vp->lvalue;
break;
#ifdef MAXOCTETS
case PW_SESSION_OCTETS_LIMIT:
/* Session traffic limit */
maxoctets = vp->lvalue;
break;
case PW_OCTETS_DIRECTION:
/* Session traffic limit direction check */
maxoctets_dir = ( vp->lvalue > 4 ) ? 0 : vp->lvalue ;
break;
#endif
case PW_ACCT_INTERIM_INTERVAL:
/* Send accounting updates every few seconds */
rstate.acct_interim_interval = vp->lvalue;
/* RFC says it MUST NOT be less than 60 seconds */
/* We use "0" to signify not sending updates */
if (rstate.acct_interim_interval &&
rstate.acct_interim_interval < 60) {
rstate.acct_interim_interval = 60;
}
break;
case PW_FRAMED_IP_ADDRESS:
/* seting up remote IP addresses */
remote = vp->lvalue;
if (remote == 0xffffffff) {
/* 0xffffffff means user should be allowed to select one */
rstate.any_ip_addr_ok = 1;
} else if (remote != 0xfffffffe) {
/* 0xfffffffe means NAS should select an ip address */
remote = htonl(vp->lvalue);
if (bad_ip_adrs (remote)) {
slprintf(msg, BUF_LEN, "RADIUS: bad remote IP address %I for %s",
remote, rstate.user);
return -1;
}
rstate.choose_ip = 1;
rstate.ip_addr = remote;
}
break;
case PW_NAS_IP_ADDRESS:
wo->ouraddr = htonl(vp->lvalue);
break;
case PW_CLASS:
/* Save Class attribute to pass it in accounting request */
if (vp->lvalue <= MAXCLASSLEN) {
rstate.class_len=vp->lvalue;
memcpy(rstate.class, vp->strvalue, rstate.class_len);
} /* else too big for our buffer - ignore it */
break;
}
} else if (vp->vendorcode == VENDOR_MICROSOFT) {
#ifdef CHAPMS
switch (vp->attribute) {
case PW_MS_CHAP2_SUCCESS:
if ((vp->lvalue != 43) || strncmp(vp->strvalue + 1, "S=", 2)) {
slprintf(msg,BUF_LEN,"RADIUS: bad MS-CHAP2-Success packet");
return -1;
}
if (message != NULL)
strlcpy(message, vp->strvalue + 1, message_space);
ms_chap2_success = 1;
break;
#ifdef MPPE
case PW_MS_CHAP_MPPE_KEYS:
if (radius_setmppekeys(vp, req_info, challenge) < 0) {
slprintf(msg, BUF_LEN,
"RADIUS: bad MS-CHAP-MPPE-Keys attribute");
return -1;
}
mppe_enc_keys = 1;
break;
case PW_MS_MPPE_SEND_KEY:
case PW_MS_MPPE_RECV_KEY:
if (radius_setmppekeys2(vp, req_info) < 0) {
slprintf(msg, BUF_LEN,
"RADIUS: bad MS-MPPE-%s-Key attribute",
(vp->attribute == PW_MS_MPPE_SEND_KEY)?
"Send": "Recv");
return -1;
}
mppe_enc_keys = 1;
break;
case PW_MS_MPPE_ENCRYPTION_POLICY:
mppe_enc_policy = vp->lvalue; /* save for later */
break;
case PW_MS_MPPE_ENCRYPTION_TYPES:
mppe_enc_types = vp->lvalue; /* save for later */
break;
#endif /* MPPE */
#ifdef MSDNS
case PW_MS_PRIMARY_DNS_SERVER:
ao->dnsaddr[0] = htonl(vp->lvalue);
got_msdns_1 = 1;
if (!got_msdns_2)
ao->dnsaddr[1] = ao->dnsaddr[0];
break;
case PW_MS_SECONDARY_DNS_SERVER:
ao->dnsaddr[1] = htonl(vp->lvalue);
got_msdns_2 = 1;
if (!got_msdns_1)
ao->dnsaddr[0] = ao->dnsaddr[1];
break;
case PW_MS_PRIMARY_NBNS_SERVER:
ao->winsaddr[0] = htonl(vp->lvalue);
got_wins_1 = 1;
if (!got_wins_2)
ao->winsaddr[1] = ao->winsaddr[0];
break;
case PW_MS_SECONDARY_NBNS_SERVER:
ao->winsaddr[1] = htonl(vp->lvalue);
got_wins_2 = 1;
if (!got_wins_1)
ao->winsaddr[0] = ao->winsaddr[1];
break;
#endif /* MSDNS */
}
#endif /* CHAPMS */
}
vp = vp->next;
}
/* Require a valid MS-CHAP2-SUCCESS for MS-CHAPv2 auth */
if (digest && (digest->code == CHAP_MICROSOFT_V2) && !ms_chap2_success)
return -1;
#ifdef MPPE
/*
* Require both policy and key attributes to indicate a valid key.
* Note that if the policy value was '0' we don't set the key!
*/
if (mppe_enc_policy && mppe_enc_keys) {
mppe_keys_set = 1;
/* Set/modify allowed encryption types. */
if (mppe_enc_types)
set_mppe_enc_types(mppe_enc_policy, mppe_enc_types);
}
#endif
return 0;
}
#ifdef MPPE
/**********************************************************************
* %FUNCTION: radius_setmppekeys
* %ARGUMENTS:
* vp -- value pair holding MS-CHAP-MPPE-KEYS attribute
* req_info -- radius request information used for encryption
* %RETURNS:
* >= 0 on success; -1 on failure
* %DESCRIPTION:
* Decrypt the "key" provided by the RADIUS server for MPPE encryption.
* See RFC 2548.
***********************************************************************/
static int
radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info,
unsigned char *challenge)
{
int i;
MD5_CTX Context;
u_char plain[32];
u_char buf[16];
if (vp->lvalue != 32) {
error("RADIUS: Incorrect attribute length (%d) for MS-CHAP-MPPE-Keys",
vp->lvalue);
return -1;
}
memcpy(plain, vp->strvalue, sizeof(plain));
MD5_Init(&Context);
MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
MD5_Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN);
MD5_Final(buf, &Context);
for (i = 0; i < 16; i++)
plain[i] ^= buf[i];
MD5_Init(&Context);
MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
MD5_Update(&Context, vp->strvalue, 16);
MD5_Final(buf, &Context);
for(i = 0; i < 16; i++)
plain[i + 16] ^= buf[i];
/*
* Annoying. The "key" returned is just the NTPasswordHashHash, which
* the NAS (us) doesn't need; we only need the start key. So we have
* to generate the start key, sigh. NB: We do not support the LM-Key.
*/
mppe_set_keys(challenge, &plain[8]);
return 0;
}
/**********************************************************************
* %FUNCTION: radius_setmppekeys2
* %ARGUMENTS:
* vp -- value pair holding MS-MPPE-SEND-KEY or MS-MPPE-RECV-KEY attribute
* req_info -- radius request information used for encryption
* %RETURNS:
* >= 0 on success; -1 on failure
* %DESCRIPTION:
* Decrypt the key provided by the RADIUS server for MPPE encryption.
* See RFC 2548.
***********************************************************************/
static int
radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info)
{
int i;
MD5_CTX Context;
u_char *salt = vp->strvalue;
u_char *crypt = vp->strvalue + 2;
u_char plain[32];
u_char buf[MD5_HASH_SIZE];
char *type = "Send";
if (vp->attribute == PW_MS_MPPE_RECV_KEY)
type = "Recv";
if (vp->lvalue != 34) {
error("RADIUS: Incorrect attribute length (%d) for MS-MPPE-%s-Key",
vp->lvalue, type);
return -1;
}
if ((salt[0] & 0x80) == 0) {
error("RADIUS: Illegal salt value for MS-MPPE-%s-Key attribute", type);
return -1;
}
memcpy(plain, crypt, 32);
MD5_Init(&Context);
MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
MD5_Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN);
MD5_Update(&Context, salt, 2);
MD5_Final(buf, &Context);
for (i = 0; i < 16; i++)
plain[i] ^= buf[i];
if (plain[0] != sizeof(mppe_send_key) /* 16 */) {
error("RADIUS: Incorrect key length (%d) for MS-MPPE-%s-Key attribute",
(int) plain[0], type);
return -1;
}
MD5_Init(&Context);
MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
MD5_Update(&Context, crypt, 16);
MD5_Final(buf, &Context);
plain[16] ^= buf[0]; /* only need the first byte */
if (vp->attribute == PW_MS_MPPE_SEND_KEY)
memcpy(mppe_send_key, plain + 1, 16);
else
memcpy(mppe_recv_key, plain + 1, 16);
return 0;
}
#endif /* MPPE */
/**********************************************************************
* %FUNCTION: radius_acct_start
* %ARGUMENTS:
* None
* %RETURNS:
* Nothing
* %DESCRIPTION:
* Sends a "start" accounting message to the RADIUS server.
***********************************************************************/
static void
radius_acct_start(void)
{
UINT4 av_type;
int result;
VALUE_PAIR *send = NULL;
ipcp_options *ho = &ipcp_hisoptions[0];
u_int32_t hisaddr;
if (!rstate.initialized) {
return;
}
rstate.start_time = time(NULL);
strncpy(rstate.session_id, rc_mksid(), sizeof(rstate.session_id));
rc_avpair_add(&send, PW_ACCT_SESSION_ID,
rstate.session_id, 0, VENDOR_NONE);
rc_avpair_add(&send, PW_USER_NAME,
rstate.user, 0, VENDOR_NONE);
if (rstate.class_len > 0)
rc_avpair_add(&send, PW_CLASS,
rstate.class, rstate.class_len, VENDOR_NONE);
av_type = PW_STATUS_START;
rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
av_type = PW_FRAMED;
rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
av_type = PW_PPP;
rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
if (*remote_number) {
rc_avpair_add(&send, PW_CALLING_STATION_ID,
remote_number, 0, VENDOR_NONE);
} else if (ipparam)
rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
av_type = PW_RADIUS;
rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
hisaddr = ho->hisaddr;
av_type = htonl(hisaddr);
rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
/* Add user specified vp's */
if (rstate.avp)
rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
if (rstate.acctserver) {
result = rc_acct_using_server(rstate.acctserver,
rstate.client_port, send);
} else {
result = rc_acct(rstate.client_port, send);
}
rc_avpair_free(send);
if (result != OK_RC) {
/* RADIUS server could be down so make this a warning */
syslog(LOG_WARNING,
"Accounting START failed for %s", rstate.user);
} else {
rstate.accounting_started = 1;
/* Kick off periodic accounting reports */
if (rstate.acct_interim_interval) {
TIMEOUT(radius_acct_interim, NULL, rstate.acct_interim_interval);
}
}
}
/**********************************************************************
* %FUNCTION: radius_acct_stop
* %ARGUMENTS:
* None
* %RETURNS:
* Nothing
* %DESCRIPTION:
* Sends a "stop" accounting message to the RADIUS server.
***********************************************************************/
static void
radius_acct_stop(void)
{
UINT4 av_type;
VALUE_PAIR *send = NULL;
ipcp_options *ho = &ipcp_hisoptions[0];
u_int32_t hisaddr;
int result;
if (!rstate.initialized) {
return;
}
if (!rstate.accounting_started) {
return;
}
if (rstate.acct_interim_interval)
UNTIMEOUT(radius_acct_interim, NULL);
rstate.accounting_started = 0;
rc_avpair_add(&send, PW_ACCT_SESSION_ID, rstate.session_id,
0, VENDOR_NONE);
rc_avpair_add(&send, PW_USER_NAME, rstate.user, 0, VENDOR_NONE);
av_type = PW_STATUS_STOP;
rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
av_type = PW_FRAMED;
rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
av_type = PW_PPP;
rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
av_type = PW_RADIUS;
rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
if (link_stats_valid) {
av_type = link_connect_time;
rc_avpair_add(&send, PW_ACCT_SESSION_TIME, &av_type, 0, VENDOR_NONE);
av_type = link_stats.bytes_out;
rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0, VENDOR_NONE);
av_type = link_stats.bytes_in;
rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0, VENDOR_NONE);
av_type = link_stats.pkts_out;
rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0, VENDOR_NONE);
av_type = link_stats.pkts_in;
rc_avpair_add(&send, PW_ACCT_INPUT_PACKETS, &av_type, 0, VENDOR_NONE);
}
if (*remote_number) {
rc_avpair_add(&send, PW_CALLING_STATION_ID,
remote_number, 0, VENDOR_NONE);
} else if (ipparam)
rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
av_type = PW_NAS_ERROR;
switch( status ) {
case EXIT_OK:
case EXIT_USER_REQUEST:
av_type = PW_USER_REQUEST;
break;
case EXIT_HANGUP:
case EXIT_PEER_DEAD:
case EXIT_CONNECT_FAILED:
av_type = PW_LOST_CARRIER;
break;
case EXIT_INIT_FAILED:
case EXIT_OPEN_FAILED:
case EXIT_LOCK_FAILED:
case EXIT_PTYCMD_FAILED:
av_type = PW_PORT_ERROR;
break;
case EXIT_PEER_AUTH_FAILED:
case EXIT_AUTH_TOPEER_FAILED:
case EXIT_NEGOTIATION_FAILED:
case EXIT_CNID_AUTH_FAILED:
av_type = PW_SERVICE_UNAVAILABLE;
break;
case EXIT_IDLE_TIMEOUT:
av_type = PW_ACCT_IDLE_TIMEOUT;
break;
case EXIT_CALLBACK:
av_type = PW_CALLBACK;
break;
case EXIT_CONNECT_TIME:
av_type = PW_ACCT_SESSION_TIMEOUT;
break;
#ifdef MAXOCTETS
case EXIT_TRAFFIC_LIMIT:
av_type = PW_NAS_REQUEST;
break;
#endif
default:
av_type = PW_NAS_ERROR;
break;
}
rc_avpair_add(&send, PW_ACCT_TERMINATE_CAUSE, &av_type, 0, VENDOR_NONE);
hisaddr = ho->hisaddr;
av_type = htonl(hisaddr);
rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
/* Add user specified vp's */
if (rstate.avp)
rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
if (rstate.acctserver) {
result = rc_acct_using_server(rstate.acctserver,
rstate.client_port, send);
} else {
result = rc_acct(rstate.client_port, send);
}
if (result != OK_RC) {
/* RADIUS server could be down so make this a warning */
syslog(LOG_WARNING,
"Accounting STOP failed for %s", rstate.user);
}
rc_avpair_free(send);
}
/**********************************************************************
* %FUNCTION: radius_acct_interim
* %ARGUMENTS:
* None
* %RETURNS:
* Nothing
* %DESCRIPTION:
* Sends an interim accounting message to the RADIUS server
***********************************************************************/
static void
radius_acct_interim(void *ignored)
{
UINT4 av_type;
VALUE_PAIR *send = NULL;
ipcp_options *ho = &ipcp_hisoptions[0];
u_int32_t hisaddr;
int result;
if (!rstate.initialized) {
return;
}
if (!rstate.accounting_started) {
return;
}
rc_avpair_add(&send, PW_ACCT_SESSION_ID, rstate.session_id,
0, VENDOR_NONE);
rc_avpair_add(&send, PW_USER_NAME, rstate.user, 0, VENDOR_NONE);
av_type = PW_STATUS_ALIVE;
rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
av_type = PW_FRAMED;
rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
av_type = PW_PPP;
rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
av_type = PW_RADIUS;
rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
/* Update link stats */
update_link_stats(0);
if (link_stats_valid) {
link_stats_valid = 0; /* Force later code to update */
av_type = link_connect_time;
rc_avpair_add(&send, PW_ACCT_SESSION_TIME, &av_type, 0, VENDOR_NONE);
av_type = link_stats.bytes_out;
rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0, VENDOR_NONE);
av_type = link_stats.bytes_in;
rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0, VENDOR_NONE);
av_type = link_stats.pkts_out;
rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0, VENDOR_NONE);
av_type = link_stats.pkts_in;
rc_avpair_add(&send, PW_ACCT_INPUT_PACKETS, &av_type, 0, VENDOR_NONE);
}
if (*remote_number) {
rc_avpair_add(&send, PW_CALLING_STATION_ID,
remote_number, 0, VENDOR_NONE);
} else if (ipparam)
rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
hisaddr = ho->hisaddr;
av_type = htonl(hisaddr);
rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
/* Add user specified vp's */
if (rstate.avp)
rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
if (rstate.acctserver) {
result = rc_acct_using_server(rstate.acctserver,
rstate.client_port, send);
} else {
result = rc_acct(rstate.client_port, send);
}
if (result != OK_RC) {
/* RADIUS server could be down so make this a warning */
syslog(LOG_WARNING,
"Interim accounting failed for %s", rstate.user);
}
rc_avpair_free(send);
/* Schedule another one */
TIMEOUT(radius_acct_interim, NULL, rstate.acct_interim_interval);
}
/**********************************************************************
* %FUNCTION: radius_ip_up
* %ARGUMENTS:
* opaque -- ignored
* arg -- ignored
* %RETURNS:
* Nothing
* %DESCRIPTION:
* Called when IPCP is up. We'll do a start-accounting record.
***********************************************************************/
static void
radius_ip_up(void *opaque, int arg)
{
radius_acct_start();
}
/**********************************************************************
* %FUNCTION: radius_ip_down
* %ARGUMENTS:
* opaque -- ignored
* arg -- ignored
* %RETURNS:
* Nothing
* %DESCRIPTION:
* Called when IPCP is down. We'll do a stop-accounting record.
***********************************************************************/
static void
radius_ip_down(void *opaque, int arg)
{
radius_acct_stop();
}
/**********************************************************************
* %FUNCTION: radius_init
* %ARGUMENTS:
* msg -- buffer of size BUF_LEN for error message
* %RETURNS:
* negative on failure; non-negative on success
* %DESCRIPTION:
* Initializes radiusclient library
***********************************************************************/
static int
radius_init(char *msg)
{
if (rstate.initialized) {
return 0;
}
if (config_file && *config_file) {
strlcpy(rstate.config_file, config_file, MAXPATHLEN-1);
}
rstate.initialized = 1;
if (rc_read_config(rstate.config_file) != 0) {
slprintf(msg, BUF_LEN, "RADIUS: Can't read config file %s",
rstate.config_file);
return -1;
}
if (rc_read_dictionary(rc_conf_str("dictionary")) != 0) {
slprintf(msg, BUF_LEN, "RADIUS: Can't read dictionary file %s",
rc_conf_str("dictionary"));
return -1;
}
if (rc_read_mapfile(rc_conf_str("mapfile")) != 0) {
slprintf(msg, BUF_LEN, "RADIUS: Can't read map file %s",
rc_conf_str("mapfile"));
return -1;
}
/* Add av pairs saved during option parsing */
while (avpopt) {
struct avpopt *n = avpopt->next;
rc_avpair_parse(avpopt->vpstr, &rstate.avp);
free(avpopt->vpstr);
free(avpopt);
avpopt = n;
}
return 0;
}
/**********************************************************************
* %FUNCTION: get_client_port
* %ARGUMENTS:
* ifname -- PPP interface name (e.g. "ppp7")
* %RETURNS:
* The NAS port number (e.g. 7)
* %DESCRIPTION:
* Extracts the port number from the interface name
***********************************************************************/
static int
get_client_port(char *ifname)
{
int port;
if (sscanf(ifname, "ppp%d", &port) == 1) {
return port;
}
return rc_map2id(ifname);
}
/**********************************************************************
* %FUNCTION: radius_allowed_address
* %ARGUMENTS:
* addr -- IP address
* %RETURNS:
* 1 if we're allowed to use that IP address; 0 if not; -1 if we do
* not know.
***********************************************************************/
static int
radius_allowed_address(u_int32_t addr)
{
ipcp_options *wo = &ipcp_wantoptions[0];
if (!rstate.choose_ip) {
/* If RADIUS server said any address is OK, then fine... */
if (rstate.any_ip_addr_ok) {
return 1;
}
/* Sigh... if an address was supplied for remote host in pppd
options, it has to match that. */
if (wo->hisaddr != 0 && wo->hisaddr == addr) {
return 1;
}
return 0;
}
if (addr == rstate.ip_addr) return 1;
return 0;
}
/* Useful for other plugins */
char *radius_logged_in_user(void)
{
return rstate.user;
}