2 * Copyright 1998 Juniper Networks, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/lib/libradius/radlib.c,v 1.15 2009/09/29 19:09:17 mav Exp $
29 #include <sys/cdefs.h>
31 #include <sys/types.h>
32 #include <sys/socket.h>
34 #include <netinet/in.h>
35 #include <arpa/inet.h>
37 #include <openssl/hmac.h>
38 #include <openssl/md5.h>
39 #define MD5Init MD5_Init
40 #define MD5Update MD5_Update
41 #define MD5Final MD5_Final
43 #define MD5_DIGEST_LENGTH 16
49 /* We need the MPPE_KEY_LEN define */
51 #include <netgraph7/mppc/ng_mppc.h>
53 #include <netgraph/mppc/ng_mppc.h>
65 #include "radlib_private.h"
67 static void clear_password(struct rad_handle
*);
68 static void generr(struct rad_handle
*, const char *, ...)
70 static void insert_scrambled_password(struct rad_handle
*, int);
71 static void insert_request_authenticator(struct rad_handle
*, int);
72 static void insert_message_authenticator(struct rad_handle
*, int);
73 static int is_valid_response(struct rad_handle
*, int,
74 const struct sockaddr_in
*);
75 static int put_password_attr(struct rad_handle
*, int,
76 const void *, size_t);
77 static int put_raw_attr(struct rad_handle
*, int,
78 const void *, size_t);
79 static int split(char *, const char *[], int, char *, size_t);
82 clear_password(struct rad_handle
*h
)
84 if (h
->pass_len
!= 0) {
85 memset(h
->pass
, 0, h
->pass_len
);
92 generr(struct rad_handle
*h
, const char *format
, ...)
97 vsnprintf(h
->errmsg
, ERRSIZE
, format
, ap
);
102 insert_scrambled_password(struct rad_handle
*h
, int srv
)
105 unsigned char md5
[MD5_DIGEST_LENGTH
];
106 const struct rad_server
*srvp
;
110 srvp
= &h
->servers
[srv
];
111 padded_len
= h
->pass_len
== 0 ? 16 : (h
->pass_len
+15) & ~0xf;
113 memcpy(md5
, &h
->out
[POS_AUTH
], LEN_AUTH
);
114 for (pos
= 0; pos
< padded_len
; pos
+= 16) {
117 /* Calculate the new scrambler */
119 MD5Update(&ctx
, srvp
->secret
, strlen(srvp
->secret
));
120 MD5Update(&ctx
, md5
, 16);
124 * Mix in the current chunk of the password, and copy
125 * the result into the right place in the request. Also
126 * modify the scrambler in place, since we will use this
127 * in calculating the scrambler for next time.
129 for (i
= 0; i
< 16; i
++)
130 h
->out
[h
->pass_pos
+ pos
+ i
] =
131 md5
[i
] ^= h
->pass
[pos
+ i
];
136 insert_request_authenticator(struct rad_handle
*h
, int resp
)
139 const struct rad_server
*srvp
;
141 srvp
= &h
->servers
[h
->srv
];
143 /* Create the request authenticator */
145 MD5Update(&ctx
, &h
->out
[POS_CODE
], POS_AUTH
- POS_CODE
);
147 MD5Update(&ctx
, &h
->in
[POS_AUTH
], LEN_AUTH
);
149 MD5Update(&ctx
, &h
->out
[POS_AUTH
], LEN_AUTH
);
150 MD5Update(&ctx
, &h
->out
[POS_ATTRS
], h
->out_len
- POS_ATTRS
);
151 MD5Update(&ctx
, srvp
->secret
, strlen(srvp
->secret
));
152 MD5Final(&h
->out
[POS_AUTH
], &ctx
);
156 insert_message_authenticator(struct rad_handle
*h
, int resp
)
159 u_char md
[EVP_MAX_MD_SIZE
];
161 const struct rad_server
*srvp
;
163 srvp
= &h
->servers
[h
->srv
];
165 if (h
->authentic_pos
!= 0) {
167 HMAC_Init(&ctx
, srvp
->secret
, strlen(srvp
->secret
), EVP_md5());
168 HMAC_Update(&ctx
, &h
->out
[POS_CODE
], POS_AUTH
- POS_CODE
);
170 HMAC_Update(&ctx
, &h
->in
[POS_AUTH
], LEN_AUTH
);
172 HMAC_Update(&ctx
, &h
->out
[POS_AUTH
], LEN_AUTH
);
173 HMAC_Update(&ctx
, &h
->out
[POS_ATTRS
],
174 h
->out_len
- POS_ATTRS
);
175 HMAC_Final(&ctx
, md
, &md_len
);
176 HMAC_CTX_cleanup(&ctx
);
178 memcpy(&h
->out
[h
->authentic_pos
+ 2], md
, md_len
);
184 * Return true if the current response is valid for a request to the
188 is_valid_response(struct rad_handle
*h
, int srv
,
189 const struct sockaddr_in
*from
)
192 unsigned char md5
[MD5_DIGEST_LENGTH
];
193 const struct rad_server
*srvp
;
197 u_char resp
[MSGSIZE
], md
[EVP_MAX_MD_SIZE
];
202 srvp
= &h
->servers
[srv
];
204 /* Check the source address */
205 if (from
->sin_family
!= srvp
->addr
.sin_family
||
206 from
->sin_addr
.s_addr
!= srvp
->addr
.sin_addr
.s_addr
||
207 from
->sin_port
!= srvp
->addr
.sin_port
)
210 /* Check the message length */
211 if (h
->in_len
< POS_ATTRS
)
213 len
= h
->in
[POS_LENGTH
] << 8 | h
->in
[POS_LENGTH
+1];
217 /* Check the response authenticator */
219 MD5Update(&ctx
, &h
->in
[POS_CODE
], POS_AUTH
- POS_CODE
);
220 MD5Update(&ctx
, &h
->out
[POS_AUTH
], LEN_AUTH
);
221 MD5Update(&ctx
, &h
->in
[POS_ATTRS
], len
- POS_ATTRS
);
222 MD5Update(&ctx
, srvp
->secret
, strlen(srvp
->secret
));
224 if (memcmp(&h
->in
[POS_AUTH
], md5
, sizeof md5
) != 0)
229 * For non accounting responses check the message authenticator,
232 if (h
->in
[POS_CODE
] != RAD_ACCOUNTING_RESPONSE
) {
234 memcpy(resp
, h
->in
, MSGSIZE
);
237 /* Search and verify the Message-Authenticator */
238 while (pos
< len
- 2) {
240 if (h
->in
[pos
] == RAD_MESSAGE_AUTHENTIC
) {
241 /* zero fill the Message-Authenticator */
242 memset(&resp
[pos
+ 2], 0, MD5_DIGEST_LENGTH
);
244 HMAC_CTX_init(&hctx
);
245 HMAC_Init(&hctx
, srvp
->secret
,
246 strlen(srvp
->secret
), EVP_md5());
247 HMAC_Update(&hctx
, &h
->in
[POS_CODE
],
248 POS_AUTH
- POS_CODE
);
249 HMAC_Update(&hctx
, &h
->out
[POS_AUTH
],
251 HMAC_Update(&hctx
, &resp
[POS_ATTRS
],
252 h
->in_len
- POS_ATTRS
);
253 HMAC_Final(&hctx
, md
, &md_len
);
254 HMAC_CTX_cleanup(&hctx
);
256 if (memcmp(md
, &h
->in
[pos
+ 2],
257 MD5_DIGEST_LENGTH
) != 0)
261 pos
+= h
->in
[pos
+ 1];
269 * Return true if the current request is valid for the specified server.
272 is_valid_request(struct rad_handle
*h
)
275 unsigned char md5
[MD5_DIGEST_LENGTH
];
276 const struct rad_server
*srvp
;
280 u_char resp
[MSGSIZE
], md
[EVP_MAX_MD_SIZE
];
285 srvp
= &h
->servers
[h
->srv
];
287 /* Check the message length */
288 if (h
->in_len
< POS_ATTRS
)
290 len
= h
->in
[POS_LENGTH
] << 8 | h
->in
[POS_LENGTH
+1];
294 if (h
->in
[POS_CODE
] != RAD_ACCESS_REQUEST
) {
295 uint32_t zeroes
[4] = { 0, 0, 0, 0 };
296 /* Check the request authenticator */
298 MD5Update(&ctx
, &h
->in
[POS_CODE
], POS_AUTH
- POS_CODE
);
299 MD5Update(&ctx
, zeroes
, LEN_AUTH
);
300 MD5Update(&ctx
, &h
->in
[POS_ATTRS
], len
- POS_ATTRS
);
301 MD5Update(&ctx
, srvp
->secret
, strlen(srvp
->secret
));
303 if (memcmp(&h
->in
[POS_AUTH
], md5
, sizeof md5
) != 0)
308 /* Search and verify the Message-Authenticator */
310 while (pos
< len
- 2) {
311 if (h
->in
[pos
] == RAD_MESSAGE_AUTHENTIC
) {
312 memcpy(resp
, h
->in
, MSGSIZE
);
313 /* zero fill the Request-Authenticator */
314 if (h
->in
[POS_CODE
] != RAD_ACCESS_REQUEST
)
315 memset(&resp
[POS_AUTH
], 0, LEN_AUTH
);
316 /* zero fill the Message-Authenticator */
317 memset(&resp
[pos
+ 2], 0, MD5_DIGEST_LENGTH
);
319 HMAC_CTX_init(&hctx
);
320 HMAC_Init(&hctx
, srvp
->secret
,
321 strlen(srvp
->secret
), EVP_md5());
322 HMAC_Update(&hctx
, resp
, h
->in_len
);
323 HMAC_Final(&hctx
, md
, &md_len
);
324 HMAC_CTX_cleanup(&hctx
);
326 if (memcmp(md
, &h
->in
[pos
+ 2],
327 MD5_DIGEST_LENGTH
) != 0)
331 pos
+= h
->in
[pos
+ 1];
338 put_password_attr(struct rad_handle
*h
, int type
, const void *value
, size_t len
)
343 if (h
->pass_pos
!= 0) {
344 generr(h
, "Multiple User-Password attributes specified");
349 padded_len
= len
== 0 ? 16 : (len
+15) & ~0xf;
350 pad_len
= padded_len
- len
;
353 * Put in a place-holder attribute containing all zeros, and
354 * remember where it is so we can fill it in later.
357 put_raw_attr(h
, type
, h
->pass
, padded_len
);
358 h
->pass_pos
= h
->out_len
- padded_len
;
360 /* Save the cleartext password, padded as necessary */
361 memcpy(h
->pass
, value
, len
);
363 memset(h
->pass
+ len
, 0, pad_len
);
368 put_raw_attr(struct rad_handle
*h
, int type
, const void *value
, size_t len
)
371 generr(h
, "Attribute too long");
374 if (h
->out_len
+ 2 + len
> MSGSIZE
) {
375 generr(h
, "Maximum message length exceeded");
378 h
->out
[h
->out_len
++] = type
;
379 h
->out
[h
->out_len
++] = len
+ 2;
380 memcpy(&h
->out
[h
->out_len
], value
, len
);
386 rad_add_server(struct rad_handle
*h
, const char *host
, int port
,
387 const char *secret
, int timeout
, int tries
)
389 struct in_addr bindto
;
390 bindto
.s_addr
= INADDR_ANY
;
392 return rad_add_server_ex(h
, host
, port
, secret
, timeout
, tries
,
397 rad_add_server_ex(struct rad_handle
*h
, const char *host
, int port
,
398 const char *secret
, int timeout
, int tries
, int dead_time
,
399 struct in_addr
*bindto
)
401 struct rad_server
*srvp
;
403 if (h
->num_servers
>= MAXSERVERS
) {
404 generr(h
, "Too many RADIUS servers specified");
407 srvp
= &h
->servers
[h
->num_servers
];
409 memset(&srvp
->addr
, 0, sizeof srvp
->addr
);
410 srvp
->addr
.sin_len
= sizeof srvp
->addr
;
411 srvp
->addr
.sin_family
= AF_INET
;
412 if (!inet_aton(host
, &srvp
->addr
.sin_addr
)) {
413 struct hostent
*hent
;
415 if ((hent
= gethostbyname(host
)) == NULL
) {
416 generr(h
, "%s: host not found", host
);
419 memcpy(&srvp
->addr
.sin_addr
, hent
->h_addr
,
420 sizeof srvp
->addr
.sin_addr
);
423 srvp
->addr
.sin_port
= htons((u_short
)port
);
425 struct servent
*sent
;
427 if (h
->type
== RADIUS_AUTH
)
428 srvp
->addr
.sin_port
=
429 (sent
= getservbyname("radius", "udp")) != NULL
?
430 sent
->s_port
: htons(RADIUS_PORT
);
432 srvp
->addr
.sin_port
=
433 (sent
= getservbyname("radacct", "udp")) != NULL
?
434 sent
->s_port
: htons(RADACCT_PORT
);
436 if ((srvp
->secret
= strdup(secret
)) == NULL
) {
437 generr(h
, "Out of memory");
440 srvp
->timeout
= timeout
;
441 srvp
->max_tries
= tries
;
444 srvp
->dead_time
= dead_time
;
445 srvp
->next_probe
= 0;
446 srvp
->bindto
= bindto
->s_addr
;
452 rad_close(struct rad_handle
*h
)
458 for (srv
= 0; srv
< h
->num_servers
; srv
++) {
459 memset(h
->servers
[srv
].secret
, 0,
460 strlen(h
->servers
[srv
].secret
));
461 free(h
->servers
[srv
].secret
);
468 rad_bind_to(struct rad_handle
*h
, in_addr_t addr
)
475 rad_config(struct rad_handle
*h
, const char *path
)
478 char buf
[MAXCONFLINE
];
483 path
= PATH_RADIUS_CONF
;
484 if ((fp
= fopen(path
, "r")) == NULL
) {
485 generr(h
, "Cannot open \"%s\": %s", path
, strerror(errno
));
490 while (fgets(buf
, sizeof buf
, fp
) != NULL
) {
492 const char *fields
[MAX_FIELDS
];
497 const char *port_str
;
499 const char *timeout_str
;
500 const char *maxtries_str
;
501 const char *dead_time_str
;
502 const char *bindto_str
;
503 char *res
, *host_dup
;
505 const char *wanttype
;
506 unsigned long timeout
;
507 unsigned long maxtries
;
508 unsigned long dead_time
;
510 struct in_addr bindto
;
515 /* We know len > 0, else fgets would have returned NULL. */
516 if (buf
[len
- 1] != '\n') {
517 if (len
== sizeof buf
- 1)
518 generr(h
, "%s:%d: line too long", path
,
521 generr(h
, "%s:%d: missing newline", path
,
528 /* Extract the fields from the line. */
529 nfields
= split(buf
, fields
, MAX_FIELDS
, msg
, sizeof msg
);
531 generr(h
, "%s:%d: %s", path
, linenum
, msg
);
538 * The first field should contain "auth" or "acct" for
539 * authentication or accounting, respectively. But older
540 * versions of the file didn't have that field. Default
541 * it to "auth" for backward compatibility.
543 if (strcmp(fields
[0], "auth") != 0 &&
544 strcmp(fields
[0], "acct") != 0) {
545 if (nfields
>= MAX_FIELDS
) {
546 generr(h
, "%s:%d: invalid service type", path
,
552 for (i
= nfields
; --i
> 0; )
553 fields
[i
] = fields
[i
- 1];
557 generr(h
, "%s:%d: missing shared secret", path
,
565 timeout_str
= fields
[3];
566 maxtries_str
= fields
[4];
567 dead_time_str
= fields
[5];
568 bindto_str
= fields
[6];
570 /* Ignore the line if it is for the wrong service type. */
571 wanttype
= h
->type
== RADIUS_AUTH
? "auth" : "acct";
572 if (strcmp(type
, wanttype
) != 0)
575 /* Parse and validate the fields. */
576 if ((host_dup
= strdup(host
)) == NULL
) {
577 generr(h
, "%s:%d: malloc failed", path
, linenum
);
582 host
= strsep(&res
, ":");
583 port_str
= strsep(&res
, ":");
584 if (port_str
!= NULL
) {
585 port
= strtoul(port_str
, &end
, 10);
588 generr(h
, "%s:%d: invalid port", path
,
595 if (timeout_str
!= NULL
) {
596 timeout
= strtoul(timeout_str
, &end
, 10);
599 generr(h
, "%s:%d: invalid timeout", path
,
606 if (maxtries_str
!= NULL
) {
607 maxtries
= strtoul(maxtries_str
, &end
, 10);
610 generr(h
, "%s:%d: invalid maxtries", path
,
618 if (dead_time_str
!= NULL
) {
619 dead_time
= strtoul(dead_time_str
, &end
, 10);
622 generr(h
, "%s:%d: invalid dead_time", path
,
628 dead_time
= DEAD_TIME
;
630 if (bindto_str
!= NULL
) {
631 bindto
.s_addr
= inet_addr(bindto_str
);
632 if (bindto
.s_addr
== INADDR_NONE
) {
634 generr(h
, "%s:%d: invalid bindto", path
,
640 bindto
.s_addr
= INADDR_ANY
;
642 if (rad_add_server_ex(h
, host
, port
, secret
, timeout
, maxtries
,
643 dead_time
, &bindto
) == -1) {
645 strcpy(msg
, h
->errmsg
);
646 generr(h
, "%s:%d: %s", path
, linenum
, msg
);
652 /* Clear out the buffer to wipe a possible copy of a shared secret */
653 memset(buf
, 0, sizeof buf
);
659 * rad_init_send_request() must have previously been called.
661 * 0 The application should select on *fd with a timeout of tv before
662 * calling rad_continue_send_request again.
667 rad_continue_send_request(struct rad_handle
*h
, int selected
, int *fd
,
672 struct sockaddr_in sin
;
674 if (h
->type
== RADIUS_SERVER
) {
675 generr(h
, "denied function call");
679 struct sockaddr_in from
;
682 fromlen
= sizeof from
;
683 h
->in_len
= recvfrom(h
->fd
, h
->in
,
684 MSGSIZE
, MSG_WAITALL
, (struct sockaddr
*)&from
, &fromlen
);
685 if (h
->in_len
== -1) {
686 generr(h
, "recvfrom: %s", strerror(errno
));
689 if (is_valid_response(h
, h
->srv
, &from
)) {
690 h
->in_len
= h
->in
[POS_LENGTH
] << 8 |
692 h
->in_pos
= POS_ATTRS
;
693 return h
->in
[POS_CODE
];
698 * Scan round-robin to the next server that has some
699 * tries left. There is guaranteed to be one, or we
700 * would have exited this loop by now.
704 if (h
->servers
[h
->srv
].num_tries
>= h
->servers
[h
->srv
].max_tries
) {
705 /* Set next probe time for this server */
706 if (h
->servers
[h
->srv
].dead_time
) {
707 h
->servers
[h
->srv
].is_dead
= 1;
708 h
->servers
[h
->srv
].next_probe
= now
+
709 h
->servers
[h
->srv
].dead_time
;
713 if (h
->srv
>= h
->num_servers
)
715 if (h
->servers
[h
->srv
].is_dead
== 0)
717 if (h
->servers
[h
->srv
].dead_time
&&
718 h
->servers
[h
->srv
].next_probe
<= now
) {
719 h
->servers
[h
->srv
].is_dead
= 0;
720 h
->servers
[h
->srv
].num_tries
= 0;
723 } while (h
->srv
!= cur_srv
);
725 if (h
->srv
== cur_srv
) {
726 generr(h
, "No valid RADIUS responses received");
732 if (h
->bindto
!= h
->servers
[h
->srv
].bindto
) {
733 h
->bindto
= h
->servers
[h
->srv
].bindto
;
735 if ((h
->fd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_UDP
)) == -1) {
736 generr(h
, "Cannot create socket: %s", strerror(errno
));
739 memset(&sin
, 0, sizeof sin
);
740 sin
.sin_len
= sizeof sin
;
741 sin
.sin_family
= AF_INET
;
742 sin
.sin_addr
.s_addr
= h
->bindto
;
744 if (bind(h
->fd
, (const struct sockaddr
*)&sin
,
746 generr(h
, "bind: %s", strerror(errno
));
753 if (h
->out
[POS_CODE
] == RAD_ACCESS_REQUEST
) {
754 /* Insert the scrambled password into the request */
755 if (h
->pass_pos
!= 0)
756 insert_scrambled_password(h
, h
->srv
);
758 insert_message_authenticator(h
, 0);
760 if (h
->out
[POS_CODE
] != RAD_ACCESS_REQUEST
) {
761 /* Insert the request authenticator into the request */
762 memset(&h
->out
[POS_AUTH
], 0, LEN_AUTH
);
763 insert_request_authenticator(h
, 0);
766 /* Send the request */
767 n
= sendto(h
->fd
, h
->out
, h
->out_len
, 0,
768 (const struct sockaddr
*)&h
->servers
[h
->srv
].addr
,
769 sizeof h
->servers
[h
->srv
].addr
);
771 tv
->tv_sec
= 1; /* Do not wait full timeout if send failed. */
773 tv
->tv_sec
= h
->servers
[h
->srv
].timeout
;
774 h
->servers
[h
->srv
].num_tries
++;
782 rad_receive_request(struct rad_handle
*h
)
784 struct sockaddr_in from
;
788 if (h
->type
!= RADIUS_SERVER
) {
789 generr(h
, "denied function call");
793 fromlen
= sizeof(from
);
794 h
->in_len
= recvfrom(h
->fd
, h
->in
,
795 MSGSIZE
, MSG_WAITALL
, (struct sockaddr
*)&from
, &fromlen
);
796 if (h
->in_len
== -1) {
797 generr(h
, "recvfrom: %s", strerror(errno
));
800 for (n
= 0; n
< h
->num_servers
; n
++) {
801 if (h
->servers
[n
].addr
.sin_addr
.s_addr
== from
.sin_addr
.s_addr
) {
802 h
->servers
[n
].addr
.sin_port
= from
.sin_port
;
809 if (is_valid_request(h
)) {
810 h
->in_len
= h
->in
[POS_LENGTH
] << 8 |
812 h
->in_pos
= POS_ATTRS
;
813 return (h
->in
[POS_CODE
]);
819 rad_send_response(struct rad_handle
*h
)
823 if (h
->type
!= RADIUS_SERVER
) {
824 generr(h
, "denied function call");
827 /* Fill in the length field in the message */
828 h
->out
[POS_LENGTH
] = h
->out_len
>> 8;
829 h
->out
[POS_LENGTH
+1] = h
->out_len
;
831 insert_message_authenticator(h
,
832 (h
->in
[POS_CODE
] == RAD_ACCESS_REQUEST
) ? 1 : 0);
833 insert_request_authenticator(h
, 1);
835 /* Send the request */
836 n
= sendto(h
->fd
, h
->out
, h
->out_len
, 0,
837 (const struct sockaddr
*)&h
->servers
[h
->srv
].addr
,
838 sizeof h
->servers
[h
->srv
].addr
);
839 if (n
!= h
->out_len
) {
841 generr(h
, "sendto: %s", strerror(errno
));
843 generr(h
, "sendto: short write");
851 rad_create_request(struct rad_handle
*h
, int code
)
855 if (h
->type
== RADIUS_SERVER
) {
856 generr(h
, "denied function call");
859 if (h
->num_servers
== 0) {
860 generr(h
, "No RADIUS servers specified");
863 h
->out
[POS_CODE
] = code
;
864 h
->out
[POS_IDENT
] = ++h
->ident
;
865 if (code
== RAD_ACCESS_REQUEST
) {
866 /* Create a random authenticator */
867 for (i
= 0; i
< LEN_AUTH
; i
+= 2) {
870 h
->out
[POS_AUTH
+i
] = (u_char
)r
;
871 h
->out
[POS_AUTH
+i
+1] = (u_char
)(r
>> 8);
874 memset(&h
->out
[POS_AUTH
], 0, LEN_AUTH
);
875 h
->out_len
= POS_ATTRS
;
877 h
->authentic_pos
= 0;
883 rad_create_response(struct rad_handle
*h
, int code
)
886 if (h
->type
!= RADIUS_SERVER
) {
887 generr(h
, "denied function call");
890 h
->out
[POS_CODE
] = code
;
891 h
->out
[POS_IDENT
] = h
->in
[POS_IDENT
];
892 memset(&h
->out
[POS_AUTH
], 0, LEN_AUTH
);
893 h
->out_len
= POS_ATTRS
;
895 h
->authentic_pos
= 0;
901 rad_cvt_addr(const void *data
)
903 struct in_addr value
;
905 memcpy(&value
.s_addr
, data
, sizeof value
.s_addr
);
910 rad_cvt_addr6(const void *data
)
912 struct in6_addr value
;
914 memcpy(&value
.s6_addr
, data
, sizeof value
.s6_addr
);
919 rad_cvt_int(const void *data
)
923 memcpy(&value
, data
, sizeof value
);
928 rad_cvt_string(const void *data
, size_t len
)
934 memcpy(s
, data
, len
);
941 * Returns the attribute type. If none are left, returns 0. On failure,
945 rad_get_attr(struct rad_handle
*h
, const void **value
, size_t *len
)
949 if (h
->in_pos
>= h
->in_len
)
951 if (h
->in_pos
+ 2 > h
->in_len
) {
952 generr(h
, "Malformed attribute in response");
955 type
= h
->in
[h
->in_pos
++];
956 *len
= h
->in
[h
->in_pos
++] - 2;
957 if (h
->in_pos
+ (int)*len
> h
->in_len
) {
958 generr(h
, "Malformed attribute in response");
961 *value
= &h
->in
[h
->in_pos
];
967 * Returns -1 on error, 0 to indicate no event and >0 for success
970 rad_init_send_request(struct rad_handle
*h
, int *fd
, struct timeval
*tv
)
974 struct sockaddr_in sin
;
976 if (h
->type
== RADIUS_SERVER
) {
977 generr(h
, "denied function call");
980 /* Make sure we have a socket to use */
982 if ((h
->fd
= socket(PF_INET
, SOCK_DGRAM
, IPPROTO_UDP
)) == -1) {
983 generr(h
, "Cannot create socket: %s", strerror(errno
));
986 memset(&sin
, 0, sizeof sin
);
987 sin
.sin_len
= sizeof sin
;
988 sin
.sin_family
= AF_INET
;
989 sin
.sin_addr
.s_addr
= h
->bindto
;
990 sin
.sin_port
= htons(0);
991 if (bind(h
->fd
, (const struct sockaddr
*)&sin
,
993 generr(h
, "bind: %s", strerror(errno
));
1000 if (h
->out
[POS_CODE
] != RAD_ACCESS_REQUEST
) {
1001 /* Make sure no password given */
1002 if (h
->pass_pos
|| h
->chap_pass
) {
1003 generr(h
, "User or Chap Password"
1004 " in accounting request");
1008 if (h
->eap_msg
== 0) {
1009 /* Make sure the user gave us a password */
1010 if (h
->pass_pos
== 0 && !h
->chap_pass
) {
1011 generr(h
, "No User or Chap Password"
1012 " attributes given");
1015 if (h
->pass_pos
!= 0 && h
->chap_pass
) {
1016 generr(h
, "Both User and Chap Password"
1017 " attributes given");
1023 /* Fill in the length field in the message */
1024 h
->out
[POS_LENGTH
] = h
->out_len
>> 8;
1025 h
->out
[POS_LENGTH
+1] = h
->out_len
;
1029 for (srv
= 0; srv
< h
->num_servers
; srv
++)
1030 h
->servers
[srv
].num_tries
= 0;
1031 /* Find a first good server. */
1032 for (srv
= 0; srv
< h
->num_servers
; srv
++) {
1033 if (h
->servers
[srv
].is_dead
== 0)
1035 if (h
->servers
[srv
].dead_time
&&
1036 h
->servers
[srv
].next_probe
<= now
) {
1037 h
->servers
[srv
].is_dead
= 0;
1043 /* If all servers was dead on the last probe, try from beginning */
1044 if (h
->srv
== h
->num_servers
) {
1045 for (srv
= 0; srv
< h
->num_servers
; srv
++) {
1046 h
->servers
[srv
].is_dead
= 0;
1047 h
->servers
[srv
].next_probe
= 0;
1052 return rad_continue_send_request(h
, 0, fd
, tv
);
1056 * Create and initialize a rad_handle structure, and return it to the
1057 * caller. Can fail only if the necessary memory cannot be allocated.
1058 * In that case, it returns NULL.
1063 struct rad_handle
*h
;
1065 h
= (struct rad_handle
*)malloc(sizeof(struct rad_handle
));
1070 h
->ident
= random();
1071 h
->errmsg
[0] = '\0';
1072 memset(h
->pass
, 0, sizeof h
->pass
);
1076 h
->authentic_pos
= 0;
1077 h
->type
= RADIUS_AUTH
;
1080 h
->bindto
= INADDR_ANY
;
1088 struct rad_handle
*h
;
1092 h
->type
= RADIUS_ACCT
;
1097 rad_server_open(int fd
)
1099 struct rad_handle
*h
;
1103 h
->type
= RADIUS_SERVER
;
1112 return rad_auth_open();
1116 rad_put_addr(struct rad_handle
*h
, int type
, struct in_addr addr
)
1118 return rad_put_attr(h
, type
, &addr
.s_addr
, sizeof addr
.s_addr
);
1122 rad_put_addr6(struct rad_handle
*h
, int type
, struct in6_addr addr
)
1125 return rad_put_attr(h
, type
, &addr
.s6_addr
, sizeof addr
.s6_addr
);
1129 rad_put_attr(struct rad_handle
*h
, int type
, const void *value
, size_t len
)
1133 if (!h
->out_created
) {
1134 generr(h
, "Please call rad_create_request()"
1135 " before putting attributes");
1139 if (h
->out
[POS_CODE
] == RAD_ACCOUNTING_REQUEST
) {
1140 if (type
== RAD_EAP_MESSAGE
) {
1141 generr(h
, "EAP-Message attribute is not valid"
1142 " in accounting requests");
1148 * When proxying EAP Messages, the Message Authenticator
1149 * MUST be present; see RFC 3579.
1151 if (type
== RAD_EAP_MESSAGE
) {
1152 if (rad_put_message_authentic(h
) == -1)
1156 if (type
== RAD_USER_PASSWORD
) {
1157 result
= put_password_attr(h
, type
, value
, len
);
1158 } else if (type
== RAD_MESSAGE_AUTHENTIC
) {
1159 result
= rad_put_message_authentic(h
);
1161 result
= put_raw_attr(h
, type
, value
, len
);
1163 if (type
== RAD_CHAP_PASSWORD
)
1165 else if (type
== RAD_EAP_MESSAGE
)
1174 rad_put_int(struct rad_handle
*h
, int type
, u_int32_t value
)
1178 nvalue
= htonl(value
);
1179 return rad_put_attr(h
, type
, &nvalue
, sizeof nvalue
);
1183 rad_put_string(struct rad_handle
*h
, int type
, const char *str
)
1185 return rad_put_attr(h
, type
, str
, strlen(str
));
1189 rad_put_message_authentic(struct rad_handle
*h
)
1192 u_char md_zero
[MD5_DIGEST_LENGTH
];
1194 if (h
->out
[POS_CODE
] == RAD_ACCOUNTING_REQUEST
) {
1195 generr(h
, "Message-Authenticator is not valid"
1196 " in accounting requests");
1200 if (h
->authentic_pos
== 0) {
1201 h
->authentic_pos
= h
->out_len
;
1202 memset(md_zero
, 0, sizeof(md_zero
));
1203 return (put_raw_attr(h
, RAD_MESSAGE_AUTHENTIC
, md_zero
,
1208 generr(h
, "Message Authenticator not supported,"
1209 " please recompile libradius with SSL support");
1215 * Returns the response type code on success, or -1 on failure.
1218 rad_send_request(struct rad_handle
*h
)
1220 struct timeval timelimit
;
1225 n
= rad_init_send_request(h
, &fd
, &tv
);
1230 gettimeofday(&timelimit
, NULL
);
1231 timeradd(&tv
, &timelimit
, &timelimit
);
1237 FD_SET(fd
, &readfds
);
1239 n
= select(fd
+ 1, &readfds
, NULL
, NULL
, &tv
);
1242 generr(h
, "select: %s", strerror(errno
));
1246 if (!FD_ISSET(fd
, &readfds
)) {
1247 /* Compute a new timeout */
1248 gettimeofday(&tv
, NULL
);
1249 timersub(&timelimit
, &tv
, &tv
);
1250 if (tv
.tv_sec
> 0 || (tv
.tv_sec
== 0 && tv
.tv_usec
> 0))
1251 /* Continue the select */
1255 n
= rad_continue_send_request(h
, n
, &fd
, &tv
);
1260 gettimeofday(&timelimit
, NULL
);
1261 timeradd(&tv
, &timelimit
, &timelimit
);
1266 rad_strerror(struct rad_handle
*h
)
1272 * Destructively split a string into fields separated by white space.
1273 * `#' at the beginning of a field begins a comment that extends to the
1274 * end of the string. Fields may be quoted with `"'. Inside quoted
1275 * strings, the backslash escapes `\"' and `\\' are honored.
1277 * Pointers to up to the first maxfields fields are stored in the fields
1278 * array. Missing fields get NULL pointers.
1280 * The return value is the actual number of fields parsed, and is always
1283 * On a syntax error, places a message in the msg string, and returns -1.
1286 split(char *str
, const char *fields
[], int maxfields
, char *msg
, size_t msglen
)
1290 static const char ws
[] = " \t";
1292 for (i
= 0; i
< maxfields
; i
++)
1296 while (*p
!= '\0') {
1298 if (*p
== '#' || *p
== '\0')
1300 if (i
>= maxfields
) {
1301 snprintf(msg
, msglen
, "line has too many fields");
1312 if (*p
!= '"' && *p
!= '\\' &&
1314 snprintf(msg
, msglen
,
1315 "invalid `\\' escape");
1320 snprintf(msg
, msglen
,
1321 "unterminated quoted string");
1328 if (*fields
[i
] == '\0') {
1329 snprintf(msg
, msglen
,
1330 "empty quoted string not permitted");
1333 if (*p
!= '\0' && strspn(p
, ws
) == 0) {
1334 snprintf(msg
, msglen
, "quoted string not"
1335 " followed by white space");
1340 p
+= strcspn(p
, ws
);
1350 rad_get_vendor_attr(u_int32_t
*vendor
, const void **data
, size_t *len
)
1352 const struct vendor_attribute
*attr
;
1354 attr
= (const struct vendor_attribute
*)*data
;
1355 *vendor
= ntohl(attr
->vendor_value
);
1356 *data
= attr
->attrib_data
;
1357 *len
= attr
->attrib_len
- 2;
1359 return (attr
->attrib_type
);
1363 rad_put_vendor_addr(struct rad_handle
*h
, int vendor
, int type
,
1364 struct in_addr addr
)
1366 return (rad_put_vendor_attr(h
, vendor
, type
, &addr
.s_addr
,
1367 sizeof addr
.s_addr
));
1371 rad_put_vendor_addr6(struct rad_handle
*h
, int vendor
, int type
,
1372 struct in6_addr addr
)
1375 return (rad_put_vendor_attr(h
, vendor
, type
, &addr
.s6_addr
,
1376 sizeof addr
.s6_addr
));
1380 rad_put_vendor_attr(struct rad_handle
*h
, int vendor
, int type
,
1381 const void *value
, size_t len
)
1383 struct vendor_attribute
*attr
;
1386 if (!h
->out_created
) {
1387 generr(h
, "Please call rad_create_request()"
1388 " before putting attributes");
1392 if ((attr
= malloc(len
+ 6)) == NULL
) {
1393 generr(h
, "malloc failure (%zu bytes)", len
+ 6);
1397 attr
->vendor_value
= htonl(vendor
);
1398 attr
->attrib_type
= type
;
1399 attr
->attrib_len
= len
+ 2;
1400 memcpy(attr
->attrib_data
, value
, len
);
1402 res
= put_raw_attr(h
, RAD_VENDOR_SPECIFIC
, attr
, len
+ 6);
1404 if (res
== 0 && vendor
== RAD_VENDOR_MICROSOFT
1405 && (type
== RAD_MICROSOFT_MS_CHAP_RESPONSE
1406 || type
== RAD_MICROSOFT_MS_CHAP2_RESPONSE
)) {
1413 rad_put_vendor_int(struct rad_handle
*h
, int vendor
, int type
, u_int32_t i
)
1418 return (rad_put_vendor_attr(h
, vendor
, type
, &value
, sizeof value
));
1422 rad_put_vendor_string(struct rad_handle
*h
, int vendor
, int type
,
1425 return (rad_put_vendor_attr(h
, vendor
, type
, str
, strlen(str
)));
1429 rad_request_authenticator(struct rad_handle
*h
, char *buf
, size_t len
)
1433 memcpy(buf
, h
->out
+ POS_AUTH
, LEN_AUTH
);
1435 buf
[LEN_AUTH
] = '\0';
1440 rad_demangle(struct rad_handle
*h
, const void *mangled
, size_t mlen
)
1446 u_char b
[MD5_DIGEST_LENGTH
], *demangled
;
1449 if ((mlen
% 16 != 0) || mlen
> 128) {
1450 generr(h
, "Cannot interpret mangled data of length %lu",
1457 /* We need the shared secret as Salt */
1458 S
= rad_server_secret(h
);
1460 /* We need the request authenticator */
1461 if (rad_request_authenticator(h
, R
, sizeof R
) != LEN_AUTH
) {
1462 generr(h
, "Cannot obtain the RADIUS request authenticator");
1466 demangled
= malloc(mlen
);
1471 MD5Update(&Context
, S
, strlen(S
));
1472 MD5Update(&Context
, R
, LEN_AUTH
);
1473 MD5Final(b
, &Context
);
1478 for (i
= 0; i
< 16; i
++)
1479 demangled
[Ppos
++] = C
[i
] ^ b
[i
];
1483 MD5Update(&Context
, S
, strlen(S
));
1484 MD5Update(&Context
, C
, 16);
1485 MD5Final(b
, &Context
);
1495 rad_demangle_mppe_key(struct rad_handle
*h
, const void *mangled
,
1496 size_t mlen
, size_t *len
)
1498 char R
[LEN_AUTH
]; /* variable names as per rfc2548 */
1500 u_char b
[MD5_DIGEST_LENGTH
], *demangled
;
1501 const u_char
*A
, *C
;
1503 int Slen
, i
, Clen
, Ppos
;
1506 if (mlen
% 16 != SALT_LEN
) {
1507 generr(h
, "Cannot interpret mangled data of length %lu",
1512 /* We need the RADIUS Request-Authenticator */
1513 if (rad_request_authenticator(h
, R
, sizeof R
) != LEN_AUTH
) {
1514 generr(h
, "Cannot obtain the RADIUS request authenticator");
1518 A
= (const u_char
*)mangled
; /* Salt comes first */
1519 C
= (const u_char
*)mangled
+ SALT_LEN
; /* Then the ciphertext */
1520 Clen
= mlen
- SALT_LEN
;
1521 S
= rad_server_secret(h
); /* We need the RADIUS secret */
1523 P
= alloca(Clen
); /* We derive our plaintext */
1526 MD5Update(&Context
, S
, Slen
);
1527 MD5Update(&Context
, R
, LEN_AUTH
);
1528 MD5Update(&Context
, A
, SALT_LEN
);
1529 MD5Final(b
, &Context
);
1535 for (i
= 0; i
< 16; i
++)
1536 P
[Ppos
++] = C
[i
] ^ b
[i
];
1540 MD5Update(&Context
, S
, Slen
);
1541 MD5Update(&Context
, C
, 16);
1542 MD5Final(b
, &Context
);
1549 * The resulting plain text consists of a one-byte length, the text and
1550 * maybe some padding.
1553 if (*len
> mlen
- 1) {
1554 generr(h
, "Mangled data seems to be garbage %zu %zu",
1559 if (*len
> MPPE_KEY_LEN
* 2) {
1560 generr(h
, "Key to long (%zu) for me max. %d",
1561 *len
, MPPE_KEY_LEN
* 2);
1564 demangled
= malloc(*len
);
1568 memcpy(demangled
, P
+ 1, *len
);
1573 rad_server_secret(struct rad_handle
*h
)
1575 return (h
->servers
[h
->srv
].secret
);