528aee8655becc69d62d51ecbb91f8d1845017c6
3 char const *cvs_id_radius
= "$Id: radius.c,v 1.26 2005/04/18 05:07:20 bodea Exp $";
8 #include <sys/socket.h>
12 #include <arpa/inet.h>
14 #include <netinet/in.h>
16 #include "constants.h"
21 extern radiust
*radius
;
22 extern sessiont
*session
;
23 extern tunnelt
*tunnel
;
24 extern configt
*config
;
26 extern ip_filtert
*ip_filters
;
28 // Set up socket for radius requests
32 LOG(3, 0, 0, "Creating %d sockets for RADIUS queries\n", config
->num_radfds
);
33 radfds
= calloc(sizeof(int), config
->num_radfds
);
34 for (i
= 0; i
< config
->num_radfds
; i
++)
37 radfds
[i
] = socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
38 flags
= fcntl(radfds
[i
], F_GETFL
, 0);
39 fcntl(radfds
[i
], F_SETFL
, flags
| O_NONBLOCK
);
43 void radiusclear(uint16_t r
, sessionidt s
)
45 if (s
) session
[s
].radius
= 0;
46 memset(&radius
[r
], 0, sizeof(radius
[r
])); // radius[r].state = RADIUSNULL;
49 static uint16_t get_free_radius()
52 static uint32_t next_radius_id
= 0;
54 for (count
= MAXRADIUS
; count
> 0 ; --count
)
56 ++next_radius_id
; // Find the next ID to check.
57 if (next_radius_id
>= MAXRADIUS
)
60 if (radius
[next_radius_id
].state
== RADIUSNULL
)
62 return next_radius_id
;
66 LOG(0, 0, 0, "Can't find a free radius session! This is very bad!\n");
70 uint16_t radiusnew(sessionidt s
)
72 uint16_t r
= session
[s
].radius
;
77 LOG(3, s
, session
[s
].tunnel
, "Re-used radius %d\n", r
);
81 if (!(r
= get_free_radius()))
83 LOG(1, s
, session
[s
].tunnel
, "No free RADIUS sessions\n");
84 STAT(radius_overflow
);
88 memset(&radius
[r
], 0, sizeof(radius
[r
]));
89 session
[s
].radius
= r
;
90 radius
[r
].session
= s
;
91 radius
[r
].state
= RADIUSWAIT
;
92 radius
[r
].retry
= TIME
+ 1200; // Wait at least 120 seconds to re-claim this.
94 LOG(3, s
, session
[s
].tunnel
, "Allocated radius %d\n", r
);
98 // Send a RADIUS request
99 void radiussend(uint16_t r
, uint8_t state
)
101 struct sockaddr_in addr
;
102 uint8_t b
[4096]; // RADIUS packet
110 s
= radius
[r
].session
;
111 if (!config
->numradiusservers
)
113 LOG(0, s
, session
[s
].tunnel
, "No RADIUS servers\n");
116 if (!*config
->radiussecret
)
118 LOG(0, s
, session
[s
].tunnel
, "No RADIUS secret\n");
122 if (state
!= RADIUSAUTH
&& !config
->radius_accounting
)
124 // Radius accounting is turned off
129 if (radius
[r
].state
!= state
)
132 radius
[r
].state
= state
;
133 radius
[r
].retry
= backoff(radius
[r
].try++);
134 LOG(4, s
, session
[s
].tunnel
, "Send RADIUS id %d sock %d state %s try %d\n",
135 r
>> RADIUS_SHIFT
, r
& RADIUS_MASK
,
136 radius_state(radius
[r
].state
), radius
[r
].try);
138 if (radius
[r
].try > config
->numradiusservers
* 2)
142 if (state
== RADIUSAUTH
)
143 sessionshutdown(s
, "RADIUS timeout", 3, 0);
146 LOG(1, s
, session
[s
].tunnel
, "RADIUS timeout, but in state %s so don't timeout session\n",
147 radius_state(state
));
150 STAT(radius_timeout
);
154 STAT(radius_retries
);
155 radius
[r
].state
= RADIUSWAIT
;
156 radius
[r
].retry
= 100;
160 // contruct RADIUS access request
164 b
[0] = 1; // access request
168 b
[0] = 4; // accounting request
171 LOG(0, 0, 0, "Unknown radius state %d\n", state
);
173 b
[1] = r
>> RADIUS_SHIFT
; // identifier
174 memcpy(b
+ 4, radius
[r
].auth
, 16);
179 p
[1] = strlen(session
[s
].user
) + 2;
180 strcpy(p
+ 2, session
[s
].user
);
183 if (state
== RADIUSAUTH
)
187 *p
= 3; // CHAP password
189 p
[2] = radius
[r
].id
; // ID
190 memcpy(p
+ 3, radius
[r
].pass
, 16); // response from CHAP request
192 *p
= 60; // CHAP Challenge
194 memcpy(p
+ 2, radius
[r
].auth
, 16);
199 strcpy(pass
, radius
[r
].pass
);
202 pass
[pl
++] = 0; // pad
211 MD5Update(&ctx
, config
->radiussecret
, strlen(config
->radiussecret
));
213 MD5Update(&ctx
, pass
+ p
- 16, 16);
215 MD5Update(&ctx
, radius
[r
].auth
, 16);
216 MD5Final(hash
, &ctx
);
219 pass
[p
] ^= hash
[p
& 15];
228 memcpy(p
+ 2, pass
, pl
);
232 else if (state
== RADIUSSTART
|| state
== RADIUSSTOP
)
234 *p
= 40; // accounting type
236 *(uint32_t *) (p
+ 2) = htonl((state
== RADIUSSTART
) ? 1 : 2);
240 *p
= 44; // session ID
242 sprintf(p
+ 2, "%08X%08X", session
[s
].unique_id
, session
[s
].opened
);
244 if (state
== RADIUSSTOP
)
246 *p
= 42; // input octets
248 *(uint32_t *) (p
+ 2) = htonl(session
[s
].cin
);
250 *p
= 43; // output octets
252 *(uint32_t *) (p
+ 2) = htonl(session
[s
].cout
);
254 *p
= 46; // session time
256 *(uint32_t *) (p
+ 2) = htonl(time(NULL
) - session
[s
].opened
);
258 *p
= 47; // input packets
260 *(uint32_t *) (p
+ 2) = htonl(session
[s
].pin
);
262 *p
= 48; // output spackets
264 *(uint32_t *) (p
+ 2) = htonl(session
[s
].pout
);
271 *(uint32_t *) (p
+ 2) = htonl(time(NULL
) - session
[s
].opened
);
280 *(uint32_t *) (p
+ 2) = htonl(s
);
283 if (s
&& session
[s
].ip
)
285 *p
= 8; // Framed-IP-Address
287 *(uint32_t *) (p
+ 2) = htonl(session
[s
].ip
);
290 if (*session
[s
].called
)
293 p
[1] = strlen(session
[s
].called
) + 2;
294 strcpy(p
+ 2, session
[s
].called
);
297 if (*radius
[r
].calling
)
300 p
[1] = strlen(radius
[r
].calling
) + 2;
301 strcpy(p
+ 2, radius
[r
].calling
);
304 else if (*session
[s
].calling
)
307 p
[1] = strlen(session
[s
].calling
) + 2;
308 strcpy(p
+ 2, session
[s
].calling
);
314 *(uint32_t *)(p
+ 2) = config
->bind_address
;
318 *(uint16_t *) (b
+ 2) = htons(p
- b
);
319 if (state
!= RADIUSAUTH
)
321 // Build auth for accounting packet
326 MD5Update(&ctx
, b
, 4);
327 MD5Update(&ctx
, z
, 16);
328 MD5Update(&ctx
, b
+ 20, (p
- b
) - 20);
329 MD5Update(&ctx
, config
->radiussecret
, strlen(config
->radiussecret
));
330 MD5Final(hash
, &ctx
);
331 memcpy(b
+ 4, hash
, 16);
332 memcpy(radius
[r
].auth
, hash
, 16);
334 memset(&addr
, 0, sizeof(addr
));
335 addr
.sin_family
= AF_INET
;
336 *(uint32_t *) & addr
.sin_addr
= config
->radiusserver
[(radius
[r
].try - 1) % config
->numradiusservers
];
339 uint16_t port
= config
->radiusport
[(radius
[r
].try - 1) % config
->numradiusservers
];
340 // assume RADIUS accounting port is the authentication port +1
341 addr
.sin_port
= htons((state
== RADIUSAUTH
) ? port
: port
+1);
344 LOG_HEX(5, "RADIUS Send", b
, (p
- b
));
345 sendto(radfds
[r
& RADIUS_MASK
], b
, p
- b
, 0, (void *) &addr
, sizeof(addr
));
348 // process RADIUS response
349 void processrad(uint8_t *buf
, int len
, char socket_index
)
351 uint8_t b
[MAXCONTROL
];
363 LOG_HEX(5, "RADIUS Response", buf
, len
);
364 if (len
< 20 || len
< ntohs(*(uint16_t *) (buf
+ 2)))
366 LOG(1, 0, 0, "Duff RADIUS response length %d\n", len
);
370 r_code
= buf
[0]; // response type
371 r_id
= buf
[1]; // radius reply indentifier.
373 len
= ntohs(*(uint16_t *) (buf
+ 2));
374 r
= socket_index
| (r_id
<< RADIUS_SHIFT
);
375 s
= radius
[r
].session
;
376 LOG(3, s
, session
[s
].tunnel
, "Received %s, radius %d response for session %u (%s, id %d)\n",
377 radius_state(radius
[r
].state
), r
, s
, radius_code(r_code
), r_id
);
379 if (!s
&& radius
[r
].state
!= RADIUSSTOP
)
381 LOG(1, s
, session
[s
].tunnel
, " Unexpected RADIUS response\n");
384 if (radius
[r
].state
!= RADIUSAUTH
&& radius
[r
].state
!= RADIUSSTART
&& radius
[r
].state
!= RADIUSSTOP
)
386 LOG(1, s
, session
[s
].tunnel
, " Unexpected RADIUS response\n");
389 t
= session
[s
].tunnel
;
391 MD5Update(&ctx
, buf
, 4);
392 MD5Update(&ctx
, radius
[r
].auth
, 16);
393 MD5Update(&ctx
, buf
+ 20, len
- 20);
394 MD5Update(&ctx
, config
->radiussecret
, strlen(config
->radiussecret
));
395 MD5Final(hash
, &ctx
);
397 if (memcmp(hash
, buf
+ 4, 16))
399 LOG(0, s
, session
[s
].tunnel
, " Incorrect auth on RADIUS response!! (wrong secret in radius config?)\n");
400 return; // Do nothing. On timeout, it will try the next radius server.
403 if ((radius
[r
].state
== RADIUSAUTH
&& r_code
!= AccessAccept
&& r_code
!= AccessReject
) ||
404 ((radius
[r
].state
== RADIUSSTART
|| radius
[r
].state
== RADIUSSTOP
) && r_code
!= AccountingResponse
))
406 LOG(1, s
, session
[s
].tunnel
, " Unexpected RADIUS response %s\n", radius_code(r_code
));
407 return; // We got something we didn't expect. Let the timeouts take
408 // care off finishing the radius session if that's really correct.
411 if (radius
[r
].state
== RADIUSAUTH
)
413 // run post-auth plugin
414 struct param_post_auth packet
= {
418 (r_code
== AccessAccept
),
419 radius
[r
].chap
? PPPCHAP
: PPPPAP
422 run_plugins(PLUGIN_POST_AUTH
, &packet
);
423 r_code
= packet
.auth_allowed
? AccessAccept
: AccessReject
;
425 // process auth response
429 uint8_t *p
= makeppp(b
, sizeof(b
), 0, 0, t
, s
, PPPCHAP
);
430 if (!p
) return; // Abort!
432 *p
= (r_code
== AccessAccept
) ? 3 : 4; // ack/nak
434 *(uint16_t *) (p
+ 2) = ntohs(4); // no message
435 tunnelsend(b
, (p
- b
) + 4, t
); // send it
437 LOG(3, s
, session
[s
].tunnel
, " CHAP User %s authentication %s.\n", session
[s
].user
,
438 (r_code
== AccessAccept
) ? "allowed" : "denied");
443 uint8_t *p
= makeppp(b
, sizeof(b
), 0, 0, t
, s
, PPPPAP
);
444 if (!p
) return; // Abort!
449 *(uint16_t *) (p
+ 2) = ntohs(5);
450 p
[4] = 0; // no message
451 tunnelsend(b
, (p
- b
) + 5, t
); // send it
453 LOG(3, s
, session
[s
].tunnel
, " PAP User %s authentication %s.\n", session
[s
].user
,
454 (r_code
== AccessAccept
) ? "allowed" : "denied");
457 if (r_code
== AccessAccept
)
460 // Extract IP, routes, etc
461 uint8_t *p
= buf
+ 20;
462 uint8_t *e
= buf
+ len
;
463 for (; p
+ 2 <= e
&& p
[1] && p
+ p
[1] <= e
; p
+= p
[1])
468 if (p
[1] < 6) continue;
469 session
[s
].ip
= ntohl(*(uint32_t *) (p
+ 2));
470 session
[s
].ip_pool_index
= -1;
471 LOG(3, s
, session
[s
].tunnel
, " Radius reply contains IP address %s\n",
472 fmtaddr(htonl(session
[s
].ip
), 0));
474 if (session
[s
].ip
== 0xFFFFFFFE)
475 session
[s
].ip
= 0; // assign from pool
480 if (p
[1] < 6) continue;
481 session
[s
].dns1
= ntohl(*(uint32_t *) (p
+ 2));
482 LOG(3, s
, session
[s
].tunnel
, " Radius reply contains primary DNS address %s\n",
483 fmtaddr(htonl(session
[s
].dns1
), 0));
488 if (p
[1] < 6) continue;
489 session
[s
].dns2
= ntohl(*(uint32_t *) (p
+ 2));
490 LOG(3, s
, session
[s
].tunnel
, " Radius reply contains secondary DNS address %s\n",
491 fmtaddr(htonl(session
[s
].dns2
), 0));
496 in_addr_t ip
= 0, mask
= 0;
500 uint8_t *e
= p
+ p
[1];
501 while (n
< e
&& (isdigit(*n
) || *n
== '.'))
509 u
= u
* 10 + *n
- '0';
516 while (n
< e
&& isdigit(*n
))
517 bits
= bits
* 10 + *n
++ - '0';
518 mask
= (( -1) << (32 - bits
));
520 else if ((ip
>> 24) < 128)
522 else if ((ip
>> 24) < 192)
527 if (routes
== MAXROUTE
)
529 LOG(1, s
, session
[s
].tunnel
, " Too many routes\n");
533 LOG(3, s
, session
[s
].tunnel
, " Radius reply contains route for %s/%s\n",
534 fmtaddr(htonl(ip
), 0), fmtaddr(htonl(mask
), 1));
536 session
[s
].route
[routes
].ip
= ip
;
537 session
[s
].route
[routes
].mask
= mask
;
544 char *filter
= p
+ 2;
550 LOG(3, s
, session
[s
].tunnel
, " Radius reply contains Filter-Id \"%.*s\"\n", l
, filter
);
551 if ((suffix
= memchr(filter
, '.', l
)))
553 int b
= suffix
- filter
;
554 if (l
- b
== 3 && !memcmp("in", suffix
+1, 2))
555 f
= &session
[s
].filter_in
;
556 else if (l
- b
== 4 && !memcmp("out", suffix
+1, 3))
557 f
= &session
[s
].filter_out
;
564 LOG(3, s
, session
[s
].tunnel
, " Invalid filter\n");
568 for (*f
= 0, i
= 0; !*f
&& i
< MAXFILTER
; i
++)
569 if (strlen(ip_filters
[i
].name
) == l
&&
570 !strncmp(ip_filters
[i
].name
, filter
, l
))
574 ip_filters
[*f
- 1].used
++;
576 LOG(3, s
, session
[s
].tunnel
, " Unknown filter\n");
579 else if (*p
== 26 && p
[1] >= 7)
581 // Vendor-Specific Attribute
582 int vendor
= ntohl(*(int *)(p
+ 2));
583 char attrib
= *(p
+ 6);
584 int attrib_length
= *(p
+ 7) - 2;
585 char *avpair
, *value
, *key
, *newp
;
587 LOG(3, s
, session
[s
].tunnel
, " Radius reply contains Vendor-Specific. Vendor=%d Attrib=%d Length=%d\n", vendor
, attrib
, attrib_length
);
588 if (vendor
!= 9 || attrib
!= 1)
590 LOG(3, s
, session
[s
].tunnel
, " Unknown vendor-specific\n");
594 if (attrib_length
< 0) continue;
596 avpair
= key
= calloc(attrib_length
+ 1, 1);
597 memcpy(avpair
, p
+ 8, attrib_length
);
598 LOG(3, s
, session
[s
].tunnel
, " Cisco-Avpair value: %s\n", avpair
);
600 value
= strchr(key
, '=');
604 // Trim quotes off reply string
605 if (*value
== '\'' || *value
== '\"')
609 x
= value
+ strlen(value
) - 1;
610 if (*x
== '\'' || *x
== '\"')
615 newp
= strchr(value
, ',');
616 if (newp
) *newp
++ = 0;
618 struct param_radius_response p
= { &tunnel
[session
[s
].tunnel
], &session
[s
], key
, value
};
619 run_plugins(PLUGIN_RADIUS_RESPONSE
, &p
);
631 uint8_t *e
= p
+ p
[1];
632 uint8_t *m
= strchr(n
, '/');
635 inet_pton(AF_INET6
, n
, &r6
);
638 while (m
< e
&& isdigit(*m
)) {
639 prefixlen
= prefixlen
* 10 + *m
++ - '0';
644 LOG(3, s
, session
[s
].tunnel
,
645 " Radius reply contains route for %s/%d\n",
647 session
[s
].ipv6route
= r6
;
648 session
[s
].ipv6prefixlen
= prefixlen
;
653 else if (r_code
== AccessReject
)
655 LOG(2, s
, session
[s
].tunnel
, " Authentication rejected for %s\n", session
[s
].user
);
656 sessionkill(s
, "Authentication rejected");
660 if (!session
[s
].dns1
&& config
->default_dns1
)
662 session
[s
].dns1
= htonl(config
->default_dns1
);
663 LOG(3, s
, t
, " Sending dns1 = %s\n", fmtaddr(config
->default_dns1
, 0));
665 if (!session
[s
].dns2
&& config
->default_dns2
)
667 session
[s
].dns2
= htonl(config
->default_dns2
);
668 LOG(3, s
, t
, " Sending dns2 = %s\n", fmtaddr(config
->default_dns2
, 0));
671 // Valid Session, set it up
672 session
[s
].unique_id
= 0;
677 // An ack for a stop or start record.
678 LOG(3, s
, t
, " RADIUS accounting ack recv in state %s\n", radius_state(radius
[r
].state
));
683 // finished with RADIUS
687 // Send a retry for RADIUS/CHAP message
688 void radiusretry(uint16_t r
)
690 sessionidt s
= radius
[r
].session
;
695 if (s
) t
= session
[s
].tunnel
;
697 radius
[r
].retry
= backoff(radius
[r
].try + 1);
698 switch (radius
[r
].state
)
700 case RADIUSCHAP
: // sending CHAP down PPP
704 sendipcp(t
, s
); // send IPCP
706 case RADIUSAUTH
: // sending auth to RADIUS server
707 radiussend(r
, RADIUSAUTH
);
709 case RADIUSSTART
: // sending start accounting to RADIUS server
710 radiussend(r
, RADIUSSTART
);
712 case RADIUSSTOP
: // sending stop accounting to RADIUS server
713 radiussend(r
, RADIUSSTOP
);
716 case RADIUSNULL
: // Not in use
717 case RADIUSWAIT
: // waiting timeout before available, in case delayed reply from RADIUS server
718 // free up RADIUS task
720 LOG(3, s
, session
[s
].tunnel
, "Freeing up radius session %d\n", r
);