1/***********************************************************************
2*
3* radius.c
4*
5* RADIUS plugin for pppd.  Performs PAP, CHAP, MS-CHAP, MS-CHAPv2
6* authentication using RADIUS.
7*
8* Copyright (C) 2002 Roaring Penguin Software Inc.
9*
10* Based on a patch for ipppd, which is:
11*    Copyright (C) 1996, Matjaz Godec <gody@elgo.si>
12*    Copyright (C) 1996, Lars Fenneberg <in5y050@public.uni-hamburg.de>
13*    Copyright (C) 1997, Miguel A.L. Paraz <map@iphil.net>
14*
15* Uses radiusclient library, which is:
16*    Copyright (C) 1995,1996,1997,1998 Lars Fenneberg <lf@elemental.net>
17*    Copyright (C) 2002 Roaring Penguin Software Inc.
18*
19* MPPE support is by Ralf Hofmann, <ralf.hofmann@elvido.net>, with
20* modification from Frank Cusack, <frank@google.com>.
21*
22* This plugin may be distributed according to the terms of the GNU
23* General Public License, version 2 or (at your option) any later version.
24*
25***********************************************************************/
26static char const RCSID[] =
27"$Id: radius.c,v 1.31 2006/05/22 00:01:40 paulus Exp $";
28
29#include "pppd.h"
30#include "chap-new.h"
31#ifdef CHAPMS
32#include "chap_ms.h"
33#ifdef MPPE
34#include "md5.h"
35#endif
36#endif
37#include "radiusclient.h"
38#include "fsm.h"
39#include "ipcp.h"
40#include <syslog.h>
41#include <sys/types.h>
42#include <sys/time.h>
43#include <string.h>
44#include <netinet/in.h>
45#include <stdlib.h>
46
47#define BUF_LEN 1024
48
49#define MD5_HASH_SIZE	16
50
51static char *config_file = NULL;
52static int add_avp(char **);
53static struct avpopt {
54    char *vpstr;
55    struct avpopt *next;
56} *avpopt = NULL;
57static bool portnummap = 0;
58
59static option_t Options[] = {
60    { "radius-config-file", o_string, &config_file },
61    { "avpair", o_special, add_avp },
62    { "map-to-ttyname", o_bool, &portnummap,
63	"Set Radius NAS-Port attribute value via libradiusclient library", OPT_PRIO | 1 },
64    { "map-to-ifname", o_bool, &portnummap,
65	"Set Radius NAS-Port attribute to number as in interface name (Default)", OPT_PRIOSUB | 0 },
66    { NULL }
67};
68
69static int radius_secret_check(void);
70static int radius_pap_auth(char *user,
71			   char *passwd,
72			   char **msgp,
73			   struct wordlist **paddrs,
74			   struct wordlist **popts);
75static int radius_chap_verify(char *user, char *ourname, int id,
76			      struct chap_digest_type *digest,
77			      unsigned char *challenge,
78			      unsigned char *response,
79			      char *message, int message_space);
80
81static void radius_ip_up(void *opaque, int arg);
82static void radius_ip_down(void *opaque, int arg);
83static void make_username_realm(char *user);
84static int radius_setparams(VALUE_PAIR *vp, char *msg, REQUEST_INFO *req_info,
85			    struct chap_digest_type *digest,
86			    unsigned char *challenge,
87			    char *message, int message_space);
88static void radius_choose_ip(u_int32_t *addrp);
89static int radius_init(char *msg);
90static int get_client_port(char *ifname);
91static int radius_allowed_address(u_int32_t addr);
92static void radius_acct_interim(void *);
93#ifdef MPPE
94static int radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info,
95			      unsigned char *);
96static int radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info);
97#endif
98
99#ifndef MAXSESSIONID
100#define MAXSESSIONID 32
101#endif
102
103#ifndef MAXCLASSLEN
104#define MAXCLASSLEN 500
105#endif
106
107struct radius_state {
108    int accounting_started;
109    int initialized;
110    int client_port;
111    int choose_ip;
112    int any_ip_addr_ok;
113    int done_chap_once;
114    u_int32_t ip_addr;
115    char user[MAXNAMELEN];
116    char config_file[MAXPATHLEN];
117    char session_id[MAXSESSIONID + 1];
118    time_t start_time;
119    int acct_interim_interval;
120    SERVER *authserver;		/* Authentication server to use */
121    SERVER *acctserver;		/* Accounting server to use */
122    int class_len;
123    char class[MAXCLASSLEN];
124    VALUE_PAIR *avp;	/* Additional (user supplied) vp's to send to server */
125};
126
127void (*radius_attributes_hook)(VALUE_PAIR *) = NULL;
128
129/* The pre_auth_hook MAY set authserver and acctserver if it wants.
130   In that case, they override the values in the radiusclient.conf file */
131void (*radius_pre_auth_hook)(char const *user,
132			     SERVER **authserver,
133			     SERVER **acctserver) = NULL;
134
135static struct radius_state rstate;
136
137char pppd_version[] = VERSION;
138
139/**********************************************************************
140* %FUNCTION: plugin_init
141* %ARGUMENTS:
142*  None
143* %RETURNS:
144*  Nothing
145* %DESCRIPTION:
146*  Initializes RADIUS plugin.
147***********************************************************************/
148void
149plugin_init(void)
150{
151    pap_check_hook = radius_secret_check;
152    pap_auth_hook = radius_pap_auth;
153
154    chap_check_hook = radius_secret_check;
155    chap_verify_hook = radius_chap_verify;
156
157    ip_choose_hook = radius_choose_ip;
158    allowed_address_hook = radius_allowed_address;
159
160    add_notifier(&ip_up_notifier, radius_ip_up, NULL);
161    add_notifier(&ip_down_notifier, radius_ip_down, NULL);
162
163    memset(&rstate, 0, sizeof(rstate));
164
165    strlcpy(rstate.config_file, "/etc/radiusclient/radiusclient.conf",
166	    sizeof(rstate.config_file));
167
168    add_options(Options);
169
170    info("RADIUS plugin initialized.");
171}
172
173/**********************************************************************
174* %FUNCTION: add_avp
175* %ARGUMENTS:
176*  argv -- the <attribute=value> pair to add
177* %RETURNS:
178*  1
179* %DESCRIPTION:
180*  Adds an av pair to be passed on to the RADIUS server on each request.
181***********************************************************************/
182static int
183add_avp(char **argv)
184{
185    struct avpopt *p = malloc(sizeof(struct avpopt));
186
187    /* Append to a list of vp's for later parsing */
188    p->vpstr = strdup(*argv);
189    p->next = avpopt;
190    avpopt = p;
191
192    return 1;
193}
194
195/**********************************************************************
196* %FUNCTION: radius_secret_check
197* %ARGUMENTS:
198*  None
199* %RETURNS:
200*  1 -- we are ALWAYS willing to supply a secret. :-)
201* %DESCRIPTION:
202* Tells pppd that we will try to authenticate the peer, and not to
203* worry about looking in /etc/ppp/*-secrets
204***********************************************************************/
205static int
206radius_secret_check(void)
207{
208    return 1;
209}
210
211/**********************************************************************
212* %FUNCTION: radius_choose_ip
213* %ARGUMENTS:
214*  addrp -- where to store the IP address
215* %RETURNS:
216*  Nothing
217* %DESCRIPTION:
218*  If RADIUS server has specified an IP address, it is stored in *addrp.
219***********************************************************************/
220static void
221radius_choose_ip(u_int32_t *addrp)
222{
223    if (rstate.choose_ip) {
224	*addrp = rstate.ip_addr;
225    }
226}
227
228/**********************************************************************
229* %FUNCTION: radius_pap_auth
230* %ARGUMENTS:
231*  user -- user-name of peer
232*  passwd -- password supplied by peer
233*  msgp -- Message which will be sent in PAP response
234*  paddrs -- set to a list of possible peer IP addresses
235*  popts -- set to a list of additional pppd options
236* %RETURNS:
237*  1 if we can authenticate, -1 if we cannot.
238* %DESCRIPTION:
239* Performs PAP authentication using RADIUS
240***********************************************************************/
241static int
242radius_pap_auth(char *user,
243		char *passwd,
244		char **msgp,
245		struct wordlist **paddrs,
246		struct wordlist **popts)
247{
248    VALUE_PAIR *send, *received;
249    UINT4 av_type;
250    int result;
251    static char radius_msg[BUF_LEN];
252
253    radius_msg[0] = 0;
254    *msgp = radius_msg;
255
256    if (radius_init(radius_msg) < 0) {
257	return 0;
258    }
259
260    /* Put user with potentially realm added in rstate.user */
261    make_username_realm(user);
262
263    if (radius_pre_auth_hook) {
264	radius_pre_auth_hook(rstate.user,
265			     &rstate.authserver,
266			     &rstate.acctserver);
267    }
268
269    send = NULL;
270    received = NULL;
271
272    /* Hack... the "port" is the ppp interface number.  Should really be
273       the tty */
274    rstate.client_port = get_client_port(portnummap ? devnam : ifname);
275
276    av_type = PW_FRAMED;
277    rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
278
279    av_type = PW_PPP;
280    rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
281
282    rc_avpair_add(&send, PW_USER_NAME, rstate.user , 0, VENDOR_NONE);
283    rc_avpair_add(&send, PW_USER_PASSWORD, passwd, 0, VENDOR_NONE);
284    if (*remote_number) {
285	rc_avpair_add(&send, PW_CALLING_STATION_ID, remote_number, 0,
286		       VENDOR_NONE);
287    } else if (ipparam)
288	rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
289
290    /* Add user specified vp's */
291    if (rstate.avp)
292	rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
293
294    if (rstate.authserver) {
295	result = rc_auth_using_server(rstate.authserver,
296				      rstate.client_port, send,
297				      &received, radius_msg, NULL);
298    } else {
299	result = rc_auth(rstate.client_port, send, &received, radius_msg, NULL);
300    }
301
302    if (result == OK_RC) {
303	if (radius_setparams(received, radius_msg, NULL, NULL, NULL, NULL, 0) < 0) {
304	    result = ERROR_RC;
305	}
306    }
307
308    /* free value pairs */
309    rc_avpair_free(received);
310    rc_avpair_free(send);
311
312    return (result == OK_RC) ? 1 : 0;
313}
314
315/**********************************************************************
316* %FUNCTION: radius_chap_verify
317* %ARGUMENTS:
318*  user -- name of the peer
319*  ourname -- name for this machine
320*  id -- the ID byte in the challenge
321*  digest -- points to the structure representing the digest type
322*  challenge -- the challenge string we sent (length in first byte)
323*  response -- the response (hash) the peer sent back (length in 1st byte)
324*  message -- space for a message to be returned to the peer
325*  message_space -- number of bytes available at *message.
326* %RETURNS:
327*  1 if the response is good, 0 if it is bad
328* %DESCRIPTION:
329* Performs CHAP, MS-CHAP and MS-CHAPv2 authentication using RADIUS.
330***********************************************************************/
331static int
332radius_chap_verify(char *user, char *ourname, int id,
333		   struct chap_digest_type *digest,
334		   unsigned char *challenge, unsigned char *response,
335		   char *message, int message_space)
336{
337    VALUE_PAIR *send, *received;
338    UINT4 av_type;
339    static char radius_msg[BUF_LEN];
340    int result;
341    int challenge_len, response_len;
342    u_char cpassword[MAX_RESPONSE_LEN + 1];
343#ifdef MPPE
344    /* Need the RADIUS secret and Request Authenticator to decode MPPE */
345    REQUEST_INFO request_info, *req_info = &request_info;
346#else
347    REQUEST_INFO *req_info = NULL;
348#endif
349
350    challenge_len = *challenge++;
351    response_len = *response++;
352
353    radius_msg[0] = 0;
354
355    if (radius_init(radius_msg) < 0) {
356	error("%s", radius_msg);
357	return 0;
358    }
359
360    /* return error for types we can't handle */
361    if ((digest->code != CHAP_MD5)
362#ifdef CHAPMS
363	&& (digest->code != CHAP_MICROSOFT)
364	&& (digest->code != CHAP_MICROSOFT_V2)
365#endif
366	) {
367	error("RADIUS: Challenge type %u unsupported", digest->code);
368	return 0;
369    }
370
371    /* Put user with potentially realm added in rstate.user */
372    if (!rstate.done_chap_once) {
373	make_username_realm(user);
374	rstate.client_port = get_client_port (portnummap ? devnam : ifname);
375	if (radius_pre_auth_hook) {
376	    radius_pre_auth_hook(rstate.user,
377				 &rstate.authserver,
378				 &rstate.acctserver);
379	}
380    }
381
382    send = received = NULL;
383
384    av_type = PW_FRAMED;
385    rc_avpair_add (&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
386
387    av_type = PW_PPP;
388    rc_avpair_add (&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
389
390    rc_avpair_add (&send, PW_USER_NAME, rstate.user , 0, VENDOR_NONE);
391
392    /*
393     * add the challenge and response fields
394     */
395    switch (digest->code) {
396    case CHAP_MD5:
397	/* CHAP-Challenge and CHAP-Password */
398	if (response_len != MD5_HASH_SIZE)
399	    return 0;
400	cpassword[0] = id;
401	memcpy(&cpassword[1], response, MD5_HASH_SIZE);
402
403	rc_avpair_add(&send, PW_CHAP_CHALLENGE,
404		      challenge, challenge_len, VENDOR_NONE);
405	rc_avpair_add(&send, PW_CHAP_PASSWORD,
406		      cpassword, MD5_HASH_SIZE + 1, VENDOR_NONE);
407	break;
408
409#ifdef CHAPMS
410    case CHAP_MICROSOFT:
411    {
412	/* MS-CHAP-Challenge and MS-CHAP-Response */
413	u_char *p = cpassword;
414
415	if (response_len != MS_CHAP_RESPONSE_LEN)
416	    return 0;
417	*p++ = id;
418	/* The idiots use a different field order in RADIUS than PPP */
419	*p++ = response[MS_CHAP_USENT];
420	memcpy(p, response, MS_CHAP_LANMANRESP_LEN + MS_CHAP_NTRESP_LEN);
421
422	rc_avpair_add(&send, PW_MS_CHAP_CHALLENGE,
423		      challenge, challenge_len, VENDOR_MICROSOFT);
424	rc_avpair_add(&send, PW_MS_CHAP_RESPONSE,
425		      cpassword, MS_CHAP_RESPONSE_LEN + 1, VENDOR_MICROSOFT);
426	break;
427    }
428
429    case CHAP_MICROSOFT_V2:
430    {
431	/* MS-CHAP-Challenge and MS-CHAP2-Response */
432	u_char *p = cpassword;
433
434	if (response_len != MS_CHAP2_RESPONSE_LEN)
435	    return 0;
436	*p++ = id;
437	/* The idiots use a different field order in RADIUS than PPP */
438	*p++ = response[MS_CHAP2_FLAGS];
439	memcpy(p, response, (MS_CHAP2_PEER_CHAL_LEN + MS_CHAP2_RESERVED_LEN
440			     + MS_CHAP2_NTRESP_LEN));
441
442	rc_avpair_add(&send, PW_MS_CHAP_CHALLENGE,
443		      challenge, challenge_len, VENDOR_MICROSOFT);
444	rc_avpair_add(&send, PW_MS_CHAP2_RESPONSE,
445		      cpassword, MS_CHAP2_RESPONSE_LEN + 1, VENDOR_MICROSOFT);
446	break;
447    }
448#endif
449    }
450
451    if (*remote_number) {
452	rc_avpair_add(&send, PW_CALLING_STATION_ID, remote_number, 0,
453		       VENDOR_NONE);
454    } else if (ipparam)
455	rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
456
457    /* Add user specified vp's */
458    if (rstate.avp)
459	rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
460
461    /*
462     * make authentication with RADIUS server
463     */
464
465    if (rstate.authserver) {
466	result = rc_auth_using_server(rstate.authserver,
467				      rstate.client_port, send,
468				      &received, radius_msg, req_info);
469    } else {
470	result = rc_auth(rstate.client_port, send, &received, radius_msg,
471			 req_info);
472    }
473
474    strlcpy(message, radius_msg, message_space);
475
476    if (result == OK_RC) {
477	if (!rstate.done_chap_once) {
478	    if (radius_setparams(received, radius_msg, req_info, digest,
479				 challenge, message, message_space) < 0) {
480		error("%s", radius_msg);
481		result = ERROR_RC;
482	    } else {
483		rstate.done_chap_once = 1;
484	    }
485	}
486    }
487
488    rc_avpair_free(received);
489    rc_avpair_free (send);
490    return (result == OK_RC);
491}
492
493/**********************************************************************
494* %FUNCTION: make_username_realm
495* %ARGUMENTS:
496*  user -- the user given to pppd
497* %RETURNS:
498*  Nothing
499* %DESCRIPTION:
500*  Copies user into rstate.user.  If it lacks a realm (no "@domain" part),
501* then the default realm from the radiusclient config file is added.
502***********************************************************************/
503static void
504make_username_realm(char *user)
505{
506    char *default_realm;
507
508    if ( user != NULL ) {
509	strlcpy(rstate.user, user, sizeof(rstate.user));
510    }  else {
511	rstate.user[0] = 0;
512    }
513
514    default_realm = rc_conf_str("default_realm");
515
516    if (!strchr(rstate.user, '@') &&
517	default_realm &&
518	(*default_realm != '\0')) {
519	strlcat(rstate.user, "@", sizeof(rstate.user));
520	strlcat(rstate.user, default_realm, sizeof(rstate.user));
521    }
522}
523
524/**********************************************************************
525* %FUNCTION: radius_setparams
526* %ARGUMENTS:
527*  vp -- received value-pairs
528*  msg -- buffer in which to place error message.  Holds up to BUF_LEN chars
529* %RETURNS:
530*  >= 0 on success; -1 on failure
531* %DESCRIPTION:
532*  Parses attributes sent by RADIUS server and sets them in pppd.
533***********************************************************************/
534static int
535radius_setparams(VALUE_PAIR *vp, char *msg, REQUEST_INFO *req_info,
536		 struct chap_digest_type *digest, unsigned char *challenge,
537		 char *message, int message_space)
538{
539    u_int32_t remote;
540    int ms_chap2_success = 0;
541#ifdef MPPE
542    int mppe_enc_keys = 0;	/* whether or not these were received */
543    int mppe_enc_policy = 0;
544    int mppe_enc_types = 0;
545#endif
546
547    /* Send RADIUS attributes to anyone else who might be interested */
548    if (radius_attributes_hook) {
549	(*radius_attributes_hook)(vp);
550    }
551
552    /*
553     * service type (if not framed then quit),
554     * new IP address (RADIUS can define static IP for some users),
555     */
556
557    while (vp) {
558	if (vp->vendorcode == VENDOR_NONE) {
559	    switch (vp->attribute) {
560	    case PW_SERVICE_TYPE:
561		/* check for service type       */
562		/* if not FRAMED then exit      */
563		if (vp->lvalue != PW_FRAMED) {
564		    slprintf(msg, BUF_LEN, "RADIUS: wrong service type %ld for %s",
565			     vp->lvalue, rstate.user);
566		    return -1;
567		}
568		break;
569
570	    case PW_FRAMED_PROTOCOL:
571		/* check for framed protocol type       */
572		/* if not PPP then also exit            */
573		if (vp->lvalue != PW_PPP) {
574		    slprintf(msg, BUF_LEN, "RADIUS: wrong framed protocol %ld for %s",
575			     vp->lvalue, rstate.user);
576		    return -1;
577		}
578		break;
579
580	    case PW_SESSION_TIMEOUT:
581		/* Session timeout */
582		maxconnect = vp->lvalue;
583		break;
584#ifdef MAXOCTETS
585	    case PW_SESSION_OCTETS_LIMIT:
586		/* Session traffic limit */
587		maxoctets = vp->lvalue;
588		break;
589	    case PW_OCTETS_DIRECTION:
590		/* Session traffic limit direction check */
591		maxoctets_dir = ( vp->lvalue > 4 ) ? 0 : vp->lvalue ;
592		break;
593#endif
594	    case PW_ACCT_INTERIM_INTERVAL:
595		/* Send accounting updates every few seconds */
596		rstate.acct_interim_interval = vp->lvalue;
597		/* RFC says it MUST NOT be less than 60 seconds */
598		/* We use "0" to signify not sending updates */
599		if (rstate.acct_interim_interval &&
600		    rstate.acct_interim_interval < 60) {
601		    rstate.acct_interim_interval = 60;
602		}
603		break;
604	    case PW_FRAMED_IP_ADDRESS:
605		/* seting up remote IP addresses */
606		remote = vp->lvalue;
607		if (remote == 0xffffffff) {
608		    /* 0xffffffff means user should be allowed to select one */
609		    rstate.any_ip_addr_ok = 1;
610		} else if (remote != 0xfffffffe) {
611		    /* 0xfffffffe means NAS should select an ip address */
612		    remote = htonl(vp->lvalue);
613		    if (bad_ip_adrs (remote)) {
614			slprintf(msg, BUF_LEN, "RADIUS: bad remote IP address %I for %s",
615				 remote, rstate.user);
616			return -1;
617		    }
618		    rstate.choose_ip = 1;
619		    rstate.ip_addr = remote;
620		}
621		break;
622	    case PW_CLASS:
623		/* Save Class attribute to pass it in accounting request */
624		if (vp->lvalue <= MAXCLASSLEN) {
625		    rstate.class_len=vp->lvalue;
626		    memcpy(rstate.class, vp->strvalue, rstate.class_len);
627		} /* else too big for our buffer - ignore it */
628		break;
629	    }
630
631
632#ifdef CHAPMS
633	} else if (vp->vendorcode == VENDOR_MICROSOFT) {
634	    switch (vp->attribute) {
635	    case PW_MS_CHAP2_SUCCESS:
636		if ((vp->lvalue != 43) || strncmp(vp->strvalue + 1, "S=", 2)) {
637		    slprintf(msg,BUF_LEN,"RADIUS: bad MS-CHAP2-Success packet");
638		    return -1;
639		}
640		if (message != NULL)
641		    strlcpy(message, vp->strvalue + 1, message_space);
642		ms_chap2_success = 1;
643		break;
644
645#ifdef MPPE
646	    case PW_MS_CHAP_MPPE_KEYS:
647		if (radius_setmppekeys(vp, req_info, challenge) < 0) {
648		    slprintf(msg, BUF_LEN,
649			     "RADIUS: bad MS-CHAP-MPPE-Keys attribute");
650		    return -1;
651		}
652		mppe_enc_keys = 1;
653		break;
654
655	    case PW_MS_MPPE_SEND_KEY:
656	    case PW_MS_MPPE_RECV_KEY:
657		if (radius_setmppekeys2(vp, req_info) < 0) {
658		    slprintf(msg, BUF_LEN,
659			     "RADIUS: bad MS-MPPE-%s-Key attribute",
660			     (vp->attribute == PW_MS_MPPE_SEND_KEY)?
661			     "Send": "Recv");
662		    return -1;
663		}
664		mppe_enc_keys = 1;
665		break;
666
667	    case PW_MS_MPPE_ENCRYPTION_POLICY:
668		mppe_enc_policy = vp->lvalue;	/* save for later */
669		break;
670
671	    case PW_MS_MPPE_ENCRYPTION_TYPES:
672		mppe_enc_types = vp->lvalue;	/* save for later */
673		break;
674
675#endif /* MPPE */
676#if 0
677	    case PW_MS_PRIMARY_DNS_SERVER:
678	    case PW_MS_SECONDARY_DNS_SERVER:
679	    case PW_MS_PRIMARY_NBNS_SERVER:
680	    case PW_MS_SECONDARY_NBNS_SERVER:
681		break;
682#endif
683	    }
684#endif /* CHAPMS */
685	}
686	vp = vp->next;
687    }
688
689    /* Require a valid MS-CHAP2-SUCCESS for MS-CHAPv2 auth */
690    if (digest && (digest->code == CHAP_MICROSOFT_V2) && !ms_chap2_success)
691	return -1;
692
693#ifdef MPPE
694    /*
695     * Require both policy and key attributes to indicate a valid key.
696     * Note that if the policy value was '0' we don't set the key!
697     */
698    if (mppe_enc_policy && mppe_enc_keys) {
699	mppe_keys_set = 1;
700	/* Set/modify allowed encryption types. */
701	if (mppe_enc_types)
702	    set_mppe_enc_types(mppe_enc_policy, mppe_enc_types);
703    }
704#endif
705
706    return 0;
707}
708
709#ifdef MPPE
710/**********************************************************************
711* %FUNCTION: radius_setmppekeys
712* %ARGUMENTS:
713*  vp -- value pair holding MS-CHAP-MPPE-KEYS attribute
714*  req_info -- radius request information used for encryption
715* %RETURNS:
716*  >= 0 on success; -1 on failure
717* %DESCRIPTION:
718*  Decrypt the "key" provided by the RADIUS server for MPPE encryption.
719*  See RFC 2548.
720***********************************************************************/
721static int
722radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info,
723		   unsigned char *challenge)
724{
725    int i;
726    MD5_CTX Context;
727    u_char  plain[32];
728    u_char  buf[16];
729
730    if (vp->lvalue != 32) {
731	error("RADIUS: Incorrect attribute length (%d) for MS-CHAP-MPPE-Keys",
732	      vp->lvalue);
733	return -1;
734    }
735
736    memcpy(plain, vp->strvalue, sizeof(plain));
737
738    MD5_Init(&Context);
739    MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
740    MD5_Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN);
741    MD5_Final(buf, &Context);
742
743    for (i = 0; i < 16; i++)
744	plain[i] ^= buf[i];
745
746    MD5_Init(&Context);
747    MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
748    MD5_Update(&Context, vp->strvalue, 16);
749    MD5_Final(buf, &Context);
750
751    for(i = 0; i < 16; i++)
752	plain[i + 16] ^= buf[i];
753
754    /*
755     * Annoying.  The "key" returned is just the NTPasswordHashHash, which
756     * the NAS (us) doesn't need; we only need the start key.  So we have
757     * to generate the start key, sigh.  NB: We do not support the LM-Key.
758     */
759    mppe_set_keys(challenge, &plain[8]);
760
761    return 0;
762}
763
764/**********************************************************************
765* %FUNCTION: radius_setmppekeys2
766* %ARGUMENTS:
767*  vp -- value pair holding MS-MPPE-SEND-KEY or MS-MPPE-RECV-KEY attribute
768*  req_info -- radius request information used for encryption
769* %RETURNS:
770*  >= 0 on success; -1 on failure
771* %DESCRIPTION:
772*  Decrypt the key provided by the RADIUS server for MPPE encryption.
773*  See RFC 2548.
774***********************************************************************/
775static int
776radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info)
777{
778    int i;
779    MD5_CTX Context;
780    u_char  *salt = vp->strvalue;
781    u_char  *crypt = vp->strvalue + 2;
782    u_char  plain[32];
783    u_char  buf[MD5_HASH_SIZE];
784    char    *type = "Send";
785
786    if (vp->attribute == PW_MS_MPPE_RECV_KEY)
787	type = "Recv";
788
789    if (vp->lvalue != 34) {
790	error("RADIUS: Incorrect attribute length (%d) for MS-MPPE-%s-Key",
791	      vp->lvalue, type);
792	return -1;
793    }
794
795    if ((salt[0] & 0x80) == 0) {
796	error("RADIUS: Illegal salt value for MS-MPPE-%s-Key attribute", type);
797	return -1;
798    }
799
800    memcpy(plain, crypt, 32);
801
802    MD5_Init(&Context);
803    MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
804    MD5_Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN);
805    MD5_Update(&Context, salt, 2);
806    MD5_Final(buf, &Context);
807
808    for (i = 0; i < 16; i++)
809	plain[i] ^= buf[i];
810
811    if (plain[0] != sizeof(mppe_send_key) /* 16 */) {
812	error("RADIUS: Incorrect key length (%d) for MS-MPPE-%s-Key attribute",
813	      (int) plain[0], type);
814	return -1;
815    }
816
817    MD5_Init(&Context);
818    MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
819    MD5_Update(&Context, crypt, 16);
820    MD5_Final(buf, &Context);
821
822    plain[16] ^= buf[0]; /* only need the first byte */
823
824    if (vp->attribute == PW_MS_MPPE_SEND_KEY)
825	memcpy(mppe_send_key, plain + 1, 16);
826    else
827	memcpy(mppe_recv_key, plain + 1, 16);
828
829    return 0;
830}
831#endif /* MPPE */
832
833/**********************************************************************
834* %FUNCTION: radius_acct_start
835* %ARGUMENTS:
836*  None
837* %RETURNS:
838*  Nothing
839* %DESCRIPTION:
840*  Sends a "start" accounting message to the RADIUS server.
841***********************************************************************/
842static void
843radius_acct_start(void)
844{
845    UINT4 av_type;
846    int result;
847    VALUE_PAIR *send = NULL;
848    ipcp_options *ho = &ipcp_hisoptions[0];
849    u_int32_t hisaddr;
850
851    if (!rstate.initialized) {
852	return;
853    }
854
855    rstate.start_time = time(NULL);
856
857    strncpy(rstate.session_id, rc_mksid(), sizeof(rstate.session_id));
858
859    rc_avpair_add(&send, PW_ACCT_SESSION_ID,
860		   rstate.session_id, 0, VENDOR_NONE);
861    rc_avpair_add(&send, PW_USER_NAME,
862		   rstate.user, 0, VENDOR_NONE);
863
864    if (rstate.class_len > 0)
865	rc_avpair_add(&send, PW_CLASS,
866		      rstate.class, rstate.class_len, VENDOR_NONE);
867
868    av_type = PW_STATUS_START;
869    rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
870
871    av_type = PW_FRAMED;
872    rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
873
874    av_type = PW_PPP;
875    rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
876
877    if (*remote_number) {
878	rc_avpair_add(&send, PW_CALLING_STATION_ID,
879		       remote_number, 0, VENDOR_NONE);
880    } else if (ipparam)
881	rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
882
883    av_type = PW_RADIUS;
884    rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
885
886
887    av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
888    rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
889
890    hisaddr = ho->hisaddr;
891    av_type = htonl(hisaddr);
892    rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
893
894    /* Add user specified vp's */
895    if (rstate.avp)
896	rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
897
898    if (rstate.acctserver) {
899	result = rc_acct_using_server(rstate.acctserver,
900				      rstate.client_port, send);
901    } else {
902	result = rc_acct(rstate.client_port, send);
903    }
904
905    rc_avpair_free(send);
906
907    if (result != OK_RC) {
908	/* RADIUS server could be down so make this a warning */
909	syslog(LOG_WARNING,
910		"Accounting START failed for %s", rstate.user);
911    } else {
912	rstate.accounting_started = 1;
913	/* Kick off periodic accounting reports */
914	if (rstate.acct_interim_interval) {
915	    TIMEOUT(radius_acct_interim, NULL, rstate.acct_interim_interval);
916	}
917    }
918}
919
920/**********************************************************************
921* %FUNCTION: radius_acct_stop
922* %ARGUMENTS:
923*  None
924* %RETURNS:
925*  Nothing
926* %DESCRIPTION:
927*  Sends a "stop" accounting message to the RADIUS server.
928***********************************************************************/
929static void
930radius_acct_stop(void)
931{
932    UINT4 av_type;
933    VALUE_PAIR *send = NULL;
934    ipcp_options *ho = &ipcp_hisoptions[0];
935    u_int32_t hisaddr;
936    int result;
937
938    if (!rstate.initialized) {
939	return;
940    }
941
942    if (!rstate.accounting_started) {
943	return;
944    }
945
946    rstate.accounting_started = 0;
947    rc_avpair_add(&send, PW_ACCT_SESSION_ID, rstate.session_id,
948		   0, VENDOR_NONE);
949
950    rc_avpair_add(&send, PW_USER_NAME, rstate.user, 0, VENDOR_NONE);
951
952    av_type = PW_STATUS_STOP;
953    rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
954
955    av_type = PW_FRAMED;
956    rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
957
958    av_type = PW_PPP;
959    rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
960
961    av_type = PW_RADIUS;
962    rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
963
964
965    if (link_stats_valid) {
966	av_type = link_connect_time;
967	rc_avpair_add(&send, PW_ACCT_SESSION_TIME, &av_type, 0, VENDOR_NONE);
968
969	av_type = link_stats.bytes_out;
970	rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0, VENDOR_NONE);
971
972	av_type = link_stats.bytes_in;
973	rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0, VENDOR_NONE);
974
975	av_type = link_stats.pkts_out;
976	rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0, VENDOR_NONE);
977
978	av_type = link_stats.pkts_in;
979	rc_avpair_add(&send, PW_ACCT_INPUT_PACKETS, &av_type, 0, VENDOR_NONE);
980    }
981
982    if (*remote_number) {
983	rc_avpair_add(&send, PW_CALLING_STATION_ID,
984		       remote_number, 0, VENDOR_NONE);
985    } else if (ipparam)
986	rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
987
988    av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
989    rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
990
991    av_type = PW_NAS_ERROR;
992    switch( status ) {
993	case EXIT_OK:
994	case EXIT_USER_REQUEST:
995	    av_type = PW_USER_REQUEST;
996	    break;
997
998	case EXIT_HANGUP:
999	case EXIT_PEER_DEAD:
1000	case EXIT_CONNECT_FAILED:
1001	    av_type = PW_LOST_CARRIER;
1002	    break;
1003
1004	case EXIT_INIT_FAILED:
1005	case EXIT_OPEN_FAILED:
1006	case EXIT_LOCK_FAILED:
1007	case EXIT_PTYCMD_FAILED:
1008	    av_type = PW_PORT_ERROR;
1009	    break;
1010
1011	case EXIT_PEER_AUTH_FAILED:
1012	case EXIT_AUTH_TOPEER_FAILED:
1013	case EXIT_NEGOTIATION_FAILED:
1014	case EXIT_CNID_AUTH_FAILED:
1015	    av_type = PW_SERVICE_UNAVAILABLE;
1016	    break;
1017
1018	case EXIT_IDLE_TIMEOUT:
1019	    av_type = PW_ACCT_IDLE_TIMEOUT;
1020	    break;
1021
1022	case EXIT_CALLBACK:
1023	    av_type = PW_CALLBACK;
1024	    break;
1025
1026	case EXIT_CONNECT_TIME:
1027	    av_type = PW_ACCT_SESSION_TIMEOUT;
1028	    break;
1029
1030#ifdef MAXOCTETS
1031	case EXIT_TRAFFIC_LIMIT:
1032	    av_type = PW_NAS_REQUEST;
1033	    break;
1034#endif
1035
1036	default:
1037	    av_type = PW_NAS_ERROR;
1038	    break;
1039    }
1040    rc_avpair_add(&send, PW_ACCT_TERMINATE_CAUSE, &av_type, 0, VENDOR_NONE);
1041
1042    hisaddr = ho->hisaddr;
1043    av_type = htonl(hisaddr);
1044    rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
1045
1046    /* Add user specified vp's */
1047    if (rstate.avp)
1048	rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
1049
1050    if (rstate.acctserver) {
1051	result = rc_acct_using_server(rstate.acctserver,
1052				      rstate.client_port, send);
1053    } else {
1054	result = rc_acct(rstate.client_port, send);
1055    }
1056
1057    if (result != OK_RC) {
1058	/* RADIUS server could be down so make this a warning */
1059	syslog(LOG_WARNING,
1060		"Accounting STOP failed for %s", rstate.user);
1061    }
1062    rc_avpair_free(send);
1063}
1064
1065/**********************************************************************
1066* %FUNCTION: radius_acct_interim
1067* %ARGUMENTS:
1068*  None
1069* %RETURNS:
1070*  Nothing
1071* %DESCRIPTION:
1072*  Sends an interim accounting message to the RADIUS server
1073***********************************************************************/
1074static void
1075radius_acct_interim(void *ignored)
1076{
1077    UINT4 av_type;
1078    VALUE_PAIR *send = NULL;
1079    ipcp_options *ho = &ipcp_hisoptions[0];
1080    u_int32_t hisaddr;
1081    int result;
1082
1083    if (!rstate.initialized) {
1084	return;
1085    }
1086
1087    if (!rstate.accounting_started) {
1088	return;
1089    }
1090
1091    rc_avpair_add(&send, PW_ACCT_SESSION_ID, rstate.session_id,
1092		   0, VENDOR_NONE);
1093
1094    rc_avpair_add(&send, PW_USER_NAME, rstate.user, 0, VENDOR_NONE);
1095
1096    av_type = PW_STATUS_ALIVE;
1097    rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
1098
1099    av_type = PW_FRAMED;
1100    rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
1101
1102    av_type = PW_PPP;
1103    rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
1104
1105    av_type = PW_RADIUS;
1106    rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
1107
1108    /* Update link stats */
1109    update_link_stats(0);
1110
1111    if (link_stats_valid) {
1112	link_stats_valid = 0; /* Force later code to update */
1113
1114	av_type = link_connect_time;
1115	rc_avpair_add(&send, PW_ACCT_SESSION_TIME, &av_type, 0, VENDOR_NONE);
1116
1117	av_type = link_stats.bytes_out;
1118	rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0, VENDOR_NONE);
1119
1120	av_type = link_stats.bytes_in;
1121	rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0, VENDOR_NONE);
1122
1123	av_type = link_stats.pkts_out;
1124	rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0, VENDOR_NONE);
1125
1126	av_type = link_stats.pkts_in;
1127	rc_avpair_add(&send, PW_ACCT_INPUT_PACKETS, &av_type, 0, VENDOR_NONE);
1128    }
1129
1130    if (*remote_number) {
1131	rc_avpair_add(&send, PW_CALLING_STATION_ID,
1132		       remote_number, 0, VENDOR_NONE);
1133    } else if (ipparam)
1134	rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
1135
1136    av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
1137    rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
1138
1139    hisaddr = ho->hisaddr;
1140    av_type = htonl(hisaddr);
1141    rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
1142
1143    /* Add user specified vp's */
1144    if (rstate.avp)
1145	rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
1146
1147    if (rstate.acctserver) {
1148	result = rc_acct_using_server(rstate.acctserver,
1149				      rstate.client_port, send);
1150    } else {
1151	result = rc_acct(rstate.client_port, send);
1152    }
1153
1154    if (result != OK_RC) {
1155	/* RADIUS server could be down so make this a warning */
1156	syslog(LOG_WARNING,
1157		"Interim accounting failed for %s", rstate.user);
1158    }
1159    rc_avpair_free(send);
1160
1161    /* Schedule another one */
1162    TIMEOUT(radius_acct_interim, NULL, rstate.acct_interim_interval);
1163}
1164
1165/**********************************************************************
1166* %FUNCTION: radius_ip_up
1167* %ARGUMENTS:
1168*  opaque -- ignored
1169*  arg -- ignored
1170* %RETURNS:
1171*  Nothing
1172* %DESCRIPTION:
1173*  Called when IPCP is up.  We'll do a start-accounting record.
1174***********************************************************************/
1175static void
1176radius_ip_up(void *opaque, int arg)
1177{
1178    radius_acct_start();
1179}
1180
1181/**********************************************************************
1182* %FUNCTION: radius_ip_down
1183* %ARGUMENTS:
1184*  opaque -- ignored
1185*  arg -- ignored
1186* %RETURNS:
1187*  Nothing
1188* %DESCRIPTION:
1189*  Called when IPCP is down.  We'll do a stop-accounting record.
1190***********************************************************************/
1191static void
1192radius_ip_down(void *opaque, int arg)
1193{
1194    radius_acct_stop();
1195}
1196
1197/**********************************************************************
1198* %FUNCTION: radius_init
1199* %ARGUMENTS:
1200*  msg -- buffer of size BUF_LEN for error message
1201* %RETURNS:
1202*  negative on failure; non-negative on success
1203* %DESCRIPTION:
1204*  Initializes radiusclient library
1205***********************************************************************/
1206static int
1207radius_init(char *msg)
1208{
1209    if (rstate.initialized) {
1210	return 0;
1211    }
1212
1213    if (config_file && *config_file) {
1214	strlcpy(rstate.config_file, config_file, MAXPATHLEN-1);
1215    }
1216
1217    rstate.initialized = 1;
1218
1219    if (rc_read_config(rstate.config_file) != 0) {
1220	slprintf(msg, BUF_LEN, "RADIUS: Can't read config file %s",
1221		 rstate.config_file);
1222	return -1;
1223    }
1224
1225    if (rc_read_dictionary(rc_conf_str("dictionary")) != 0) {
1226	slprintf(msg, BUF_LEN, "RADIUS: Can't read dictionary file %s",
1227		 rc_conf_str("dictionary"));
1228	return -1;
1229    }
1230
1231    if (rc_read_mapfile(rc_conf_str("mapfile")) != 0)	{
1232	slprintf(msg, BUF_LEN, "RADIUS: Can't read map file %s",
1233		 rc_conf_str("mapfile"));
1234	return -1;
1235    }
1236
1237    /* Add av pairs saved during option parsing */
1238    while (avpopt) {
1239	struct avpopt *n = avpopt->next;
1240
1241	rc_avpair_parse(avpopt->vpstr, &rstate.avp);
1242	free(avpopt->vpstr);
1243	free(avpopt);
1244	avpopt = n;
1245    }
1246    return 0;
1247}
1248
1249/**********************************************************************
1250* %FUNCTION: get_client_port
1251* %ARGUMENTS:
1252*  ifname -- PPP interface name (e.g. "ppp7")
1253* %RETURNS:
1254*  The NAS port number (e.g. 7)
1255* %DESCRIPTION:
1256*  Extracts the port number from the interface name
1257***********************************************************************/
1258static int
1259get_client_port(char *ifname)
1260{
1261    int port;
1262    if (sscanf(ifname, "ppp%d", &port) == 1) {
1263	return port;
1264    }
1265    return rc_map2id(ifname);
1266}
1267
1268/**********************************************************************
1269* %FUNCTION: radius_allowed_address
1270* %ARGUMENTS:
1271*  addr -- IP address
1272* %RETURNS:
1273*  1 if we're allowed to use that IP address; 0 if not; -1 if we do
1274*  not know.
1275***********************************************************************/
1276static int
1277radius_allowed_address(u_int32_t addr)
1278{
1279    ipcp_options *wo = &ipcp_wantoptions[0];
1280
1281    if (!rstate.choose_ip) {
1282	/* If RADIUS server said any address is OK, then fine... */
1283	if (rstate.any_ip_addr_ok) {
1284	    return 1;
1285	}
1286
1287	/* Sigh... if an address was supplied for remote host in pppd
1288	   options, it has to match that.  */
1289	if (wo->hisaddr != 0 && wo->hisaddr == addr) {
1290	    return 1;
1291	}
1292
1293	return 0;
1294    }
1295    if (addr == rstate.ip_addr) return 1;
1296    return 0;
1297}
1298
1299/* Useful for other plugins */
1300char *radius_logged_in_user(void)
1301{
1302    return rstate.user;
1303}
1304