1 /* See the file COPYING for licensing information. */
3 #if defined HAVE_CONFIG_H
12 #include <freeradius/libradius.h>
13 #include <event2/event.h>
14 #include <event2/bufferevent.h>
15 #include <radsec/radsec.h>
16 #include <radsec/radsec-impl.h>
19 #if defined (RS_ENABLE_TLS)
20 #include <event2/bufferevent_ssl.h>
21 #include <openssl/err.h>
25 #include <sys/socket.h>
26 #include <event2/buffer.h>
30 _loopbreak (struct rs_connection *conn)
32 int err = event_base_loopbreak (conn->evb);
34 rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,
35 "event_base_loopbreak: %s",
36 evutil_gai_strerror (err));
41 _do_send (struct rs_packet *pkt)
47 assert (!pkt->original);
49 vp = paircreate (PW_MESSAGE_AUTHENTICATOR, PW_TYPE_OCTETS);
51 return rs_err_conn_push_fl (pkt->conn, RSE_NOMEM, __FILE__, __LINE__,
52 "paircreate: %s", fr_strerror ());
53 pairadd (&pkt->rpkt->vps, vp);
55 if (rad_encode (pkt->rpkt, NULL, pkt->conn->active_peer->secret))
56 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
57 "rad_encode: %s", fr_strerror ());
58 if (rad_sign (pkt->rpkt, NULL, pkt->conn->active_peer->secret))
59 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
60 "rad_sign: %s", fr_strerror ());
63 char host[80], serv[80];
65 getnameinfo (pkt->conn->active_peer->addr->ai_addr,
66 pkt->conn->active_peer->addr->ai_addrlen,
67 host, sizeof(host), serv, sizeof(serv),
68 0 /* NI_NUMERICHOST|NI_NUMERICSERV*/);
69 rs_debug (("%s: about to send this to %s:%s:\n", __func__, host, serv));
74 err = bufferevent_write (pkt->conn->bev, pkt->rpkt->data,
77 return rs_err_conn_push_fl (pkt->conn, RSE_EVENT, __FILE__, __LINE__,
78 "bufferevent_write: %s",
79 evutil_gai_strerror (err));
84 _on_connect (struct rs_connection *conn)
86 conn->is_connected = 1;
87 rs_debug (("%s: %p connected\n", __func__, conn->active_peer));
88 evtimer_del (conn->tev);
89 if (conn->callbacks.connected_cb)
90 conn->callbacks.connected_cb (conn->user_data);
94 _on_disconnect (struct rs_connection *conn)
96 conn->is_connecting = 0;
97 conn->is_connected = 0;
98 rs_debug (("%s: %p disconnected\n", __func__, conn->active_peer));
99 if (conn->callbacks.disconnected_cb)
100 conn->callbacks.disconnected_cb (conn->user_data);
104 _event_cb (struct bufferevent *bev, short events, void *ctx)
106 struct rs_packet *pkt = (struct rs_packet *)ctx;
107 struct rs_connection *conn = NULL;
108 struct rs_peer *p = NULL;
110 #if defined (RS_ENABLE_TLS)
111 unsigned long tlserr = 0;
116 assert (pkt->conn->active_peer);
118 p = conn->active_peer;
120 conn->is_connecting = 0;
121 if (events & BEV_EVENT_CONNECTED)
125 rs_debug (("%s: error sending\n", __func__));
127 else if (events & BEV_EVENT_EOF)
129 _on_disconnect (conn);
131 else if (events & BEV_EVENT_TIMEOUT)
133 rs_debug (("%s: %p times out on %s\n", __func__, p,
134 (events & BEV_EVENT_READING) ? "read" : "write"));
135 rs_err_conn_push_fl (pkt->conn, RSE_IOTIMEOUT, __FILE__, __LINE__, NULL);
137 else if (events & BEV_EVENT_ERROR)
139 sockerr = evutil_socket_geterror (conn->active_peer->fd);
140 if (sockerr == 0) /* FIXME: True that errno == 0 means closed? */
142 _on_disconnect (conn);
146 rs_err_conn_push_fl (pkt->conn, RSE_SOCKERR, __FILE__, __LINE__,
147 "%d: socket error %d (%s)",
150 evutil_socket_error_to_string (sockerr));
151 rs_debug (("%s: socket error on fd %d: %s (%d)\n", __func__,
153 evutil_socket_error_to_string (sockerr),
156 #if defined (RS_ENABLE_TLS)
157 if (conn->tls_ssl) /* FIXME: correct check? */
159 for (tlserr = bufferevent_get_openssl_error (conn->bev);
161 tlserr = bufferevent_get_openssl_error (conn->bev))
163 rs_debug (("%s: openssl error: %s\n", __func__,
164 ERR_error_string (tlserr, NULL)));
165 rs_err_conn_push_fl (pkt->conn, RSE_SSLERR, __FILE__, __LINE__,
166 ERR_error_string (tlserr, NULL));
169 #endif /* RS_ENABLE_TLS */
174 if (events & BEV_EVENT_ERROR && events != BEV_EVENT_ERROR)
175 rs_debug (("%s: BEV_EVENT_ERROR and more: 0x%x\n", __func__, events));
180 _write_cb (struct bufferevent *bev, void *ctx)
182 struct rs_packet *pkt = (struct rs_packet *) ctx;
187 if (pkt->conn->callbacks.sent_cb)
188 pkt->conn->callbacks.sent_cb (pkt->conn->user_data);
191 /* Read one RADIUS packet header. Return !0 on error. A return value
192 of 0 means that we need more data. */
194 _read_header (struct rs_packet *pkt)
198 n = bufferevent_read (pkt->conn->bev, pkt->hdr, RS_HEADER_LEN);
199 if (n == RS_HEADER_LEN)
201 pkt->hdr_read_flag = 1;
202 pkt->rpkt->data_len = (pkt->hdr[2] << 8) + pkt->hdr[3];
203 if (pkt->rpkt->data_len < 20 || pkt->rpkt->data_len > 4096)
205 bufferevent_free (pkt->conn->bev); /* Close connection. */
206 return rs_err_conn_push (pkt->conn, RSE_INVALID_PKT,
207 "invalid packet length: %d",
208 pkt->rpkt->data_len);
210 pkt->rpkt->data = rs_malloc (pkt->conn->ctx, pkt->rpkt->data_len);
211 if (!pkt->rpkt->data)
213 bufferevent_free (pkt->conn->bev); /* Close connection. */
214 return rs_err_conn_push_fl (pkt->conn, RSE_NOMEM, __FILE__, __LINE__,
217 memcpy (pkt->rpkt->data, pkt->hdr, RS_HEADER_LEN);
218 bufferevent_setwatermark (pkt->conn->bev, EV_READ,
219 pkt->rpkt->data_len - RS_HEADER_LEN, 0);
220 rs_debug (("%s: packet header read, total pkt len=%d\n",
221 __func__, pkt->rpkt->data_len));
225 rs_debug (("%s: buffer frozen while reading header\n", __func__));
227 else /* Error: libevent gave us less than the low watermark. */
229 bufferevent_free (pkt->conn->bev); /* Close connection. */
230 return rs_err_conn_push_fl (pkt->conn, RSE_INTERNAL, __FILE__, __LINE__,
231 "got %d octets reading header", n);
238 _read_packet (struct rs_packet *pkt)
242 rs_debug (("%s: trying to read %d octets of packet data\n", __func__,
243 pkt->rpkt->data_len - RS_HEADER_LEN));
245 n = bufferevent_read (pkt->conn->bev,
246 pkt->rpkt->data + RS_HEADER_LEN,
247 pkt->rpkt->data_len - RS_HEADER_LEN);
249 rs_debug (("%s: read %ld octets of packet data\n", __func__, n));
251 if (n == pkt->rpkt->data_len - RS_HEADER_LEN)
253 bufferevent_disable (pkt->conn->bev, EV_READ);
254 rs_debug (("%s: complete packet read\n", __func__));
255 pkt->hdr_read_flag = 0;
256 memset (pkt->hdr, 0, sizeof(*pkt->hdr));
258 /* Checks done by rad_packet_ok:
259 - lenghts (FIXME: checks really ok for tcp?)
261 - attribute lengths >= 2
262 - attribute sizes adding up correctly */
263 if (!rad_packet_ok (pkt->rpkt, 0) != 0)
265 bufferevent_free (pkt->conn->bev); /* Close connection. */
266 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
267 "invalid packet: %s", fr_strerror ());
270 /* TODO: Verify that reception of an unsolicited response packet
271 results in connection being closed. */
273 /* If we have a request to match this response against, verify
274 and decode the response. */
277 /* Verify header and message authenticator. */
278 if (rad_verify (pkt->rpkt, pkt->original->rpkt,
279 pkt->conn->active_peer->secret))
281 bufferevent_free (pkt->conn->bev); /* Close connection. */
282 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
283 "rad_verify: %s", fr_strerror ());
286 /* Decode and decrypt. */
287 if (rad_decode (pkt->rpkt, pkt->original->rpkt,
288 pkt->conn->active_peer->secret))
290 bufferevent_free (pkt->conn->bev); /* Close connection. */
291 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
292 "rad_decode: %s", fr_strerror ());
297 /* Find out what happens if there's data left in the buffer. */
300 rest = evbuffer_get_length (bufferevent_get_input (pkt->conn->bev));
302 rs_debug (("%s: returning with %d octets left in buffer\n", __func__,
307 /* Hand over message to user, changes ownership of pkt. Don't
308 touch it afterwards -- it might have been freed. */
309 if (pkt->conn->callbacks.received_cb)
310 pkt->conn->callbacks.received_cb (pkt, pkt->conn->user_data);
312 else if (n < 0) /* Buffer frozen. */
313 rs_debug (("%s: buffer frozen when reading packet\n", __func__));
314 else /* Short packet. */
315 rs_debug (("%s: waiting for another %d octets\n", __func__,
316 pkt->rpkt->data_len - RS_HEADER_LEN - n));
321 /* Read callback for TCP.
323 Read exactly one RADIUS message from BEV and store it in struct
324 rs_packet passed in CTX (hereby called 'pkt').
326 Verify the received packet against pkt->original, if !NULL.
328 Inform upper layer about successful reception of valid RADIUS
329 message by invoking conn->callbacks.recevied_cb(), if !NULL. */
331 _read_cb (struct bufferevent *bev, void *ctx)
333 struct rs_packet *pkt = (struct rs_packet *) ctx;
339 pkt->rpkt->sockfd = pkt->conn->fd;
340 pkt->rpkt->vps = NULL;
342 if (!pkt->hdr_read_flag)
343 if (_read_header (pkt))
349 _evlog_cb (int severity, const char *msg)
354 case _EVENT_LOG_DEBUG:
355 #if !defined (DEBUG_LEVENT)
363 case _EVENT_LOG_WARN:
373 fprintf (stderr, "libevent: [%s] %s\n", sevstr, msg); /* FIXME: stderr? */
377 _init_evb (struct rs_connection *conn)
383 event_enable_debug_mode ();
385 event_set_log_callback (_evlog_cb);
386 conn->evb = event_base_new ();
388 return rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,
395 _init_socket (struct rs_connection *conn, struct rs_peer *p)
401 conn->fd = socket (p->addr->ai_family, p->addr->ai_socktype,
402 p->addr->ai_protocol);
404 return rs_err_conn_push_fl (conn, RSE_SOME_ERROR, __FILE__, __LINE__,
406 if (evutil_make_socket_nonblocking (conn->fd) < 0)
408 evutil_closesocket (conn->fd);
410 return rs_err_conn_push_fl (conn, RSE_SOME_ERROR, __FILE__, __LINE__,
416 static struct rs_peer *
417 _pick_peer (struct rs_connection *conn)
421 if (conn->active_peer)
422 conn->active_peer = conn->active_peer->next; /* Next. */
423 if (!conn->active_peer)
424 conn->active_peer = conn->peers; /* From the top. */
426 return conn->active_peer;
430 _conn_timeout_cb (int fd, short event, void *data)
432 struct rs_connection *conn;
435 conn = (struct rs_connection *) data;
437 if (event & EV_TIMEOUT)
439 rs_debug (("%s: connection timeout on %p (fd %d) connecting to %p\n",
440 __func__, conn, conn->fd, conn->active_peer));
441 conn->is_connecting = 0;
442 rs_err_conn_push_fl (conn, RSE_IOTIMEOUT, __FILE__, __LINE__, NULL);
447 _set_timeout (struct rs_connection *conn)
452 conn->tev = evtimer_new (conn->evb, _conn_timeout_cb, conn);
454 return rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,
456 tv.tv_sec = conn->realm->timeout;
458 evtimer_add (conn->tev, &tv);
464 _init_bev (struct rs_connection *conn, struct rs_peer *peer)
469 switch (conn->realm->type)
471 case RS_CONN_TYPE_UDP:
473 /* NOTE: We know this is wrong for several reasons, most notably
474 because libevent doesn't work as expected with UDP. The
475 timeout handling is wrong too. */
476 case RS_CONN_TYPE_TCP:
477 conn->bev = bufferevent_socket_new (conn->evb, conn->fd, 0);
479 return rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,
480 "bufferevent_socket_new");
483 #if defined (RS_ENABLE_TLS)
484 case RS_CONN_TYPE_TLS:
485 if (rs_tls_init (conn))
487 /* Would be convenient to pass BEV_OPT_CLOSE_ON_FREE but things
488 seem to break when be_openssl_ctrl() (in libevent) calls
489 SSL_set_bio() after BIO_new_socket() with flag=1. */
491 bufferevent_openssl_socket_new (conn->evb, conn->fd, conn->tls_ssl,
492 BUFFEREVENT_SSL_CONNECTING, 0);
494 return rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,
495 "bufferevent_openssl_socket_new");
498 case RS_CONN_TYPE_DTLS:
499 return rs_err_conn_push_fl (conn, RSE_NOSYS, __FILE__, __LINE__,
500 "%s: NYI", __func__);
501 #endif /* RS_ENABLE_TLS */
504 return rs_err_conn_push_fl (conn, RSE_INTERNAL, __FILE__, __LINE__,
505 "%s: unknown connection type: %d", __func__,
513 _do_connect (struct rs_connection *conn)
519 assert (conn->active_peer);
520 p = conn->active_peer;
524 char host[80], serv[80];
526 getnameinfo (p->addr->ai_addr,
528 host, sizeof(host), serv, sizeof(serv),
529 0 /* NI_NUMERICHOST|NI_NUMERICSERV*/);
530 rs_debug (("%s: connecting to %s:%s\n", __func__, host, serv));
535 err = bufferevent_socket_connect (p->conn->bev, p->addr->ai_addr,
536 p->addr->ai_addrlen);
538 rs_err_conn_push_fl (p->conn, RSE_EVENT, __FILE__, __LINE__,
539 "bufferevent_socket_connect: %s",
540 evutil_gai_strerror (err));
542 p->conn->is_connecting = 1;
546 _conn_open(struct rs_connection *conn, struct rs_packet *pkt)
548 if (_init_evb (conn))
551 if (!conn->active_peer)
553 if (!conn->active_peer)
554 return rs_err_conn_push_fl (conn, RSE_NOPEER, __FILE__, __LINE__, NULL);
556 if (_init_socket (conn, conn->active_peer))
559 if (_init_bev (conn, conn->active_peer))
562 if (!conn->is_connected)
563 if (!conn->is_connecting)
570 _conn_is_open_p (struct rs_connection *conn)
572 return conn->active_peer && conn->is_connected;
575 /* Public functions. */
577 rs_packet_create (struct rs_connection *conn, struct rs_packet **pkt_out)
584 rpkt = rad_alloc (1);
586 return rs_err_conn_push (conn, RSE_NOMEM, __func__);
587 rpkt->id = conn->nextid++;
589 p = (struct rs_packet *) malloc (sizeof (struct rs_packet));
593 return rs_err_conn_push (conn, RSE_NOMEM, __func__);
595 memset (p, 0, sizeof (struct rs_packet));
604 rs_packet_create_auth_request (struct rs_connection *conn,
605 struct rs_packet **pkt_out,
606 const char *user_name, const char *user_pw)
608 struct rs_packet *pkt;
609 struct rs_attr *attr;
611 if (rs_packet_create (conn, pkt_out))
614 pkt->rpkt->code = PW_AUTHENTICATION_REQUEST;
618 if (rs_attr_create (conn, &attr, "User-Name", user_name))
620 rs_packet_add_attr (pkt, attr);
624 if (rs_attr_create (conn, &attr, "User-Password", user_pw))
626 rs_packet_add_attr (pkt, attr);
633 /* User callback used when we're dispatching for user. */
635 _wcb (void *user_data)
637 struct rs_packet *pkt = (struct rs_packet *) user_data;
639 pkt->written_flag = 1;
640 bufferevent_disable (pkt->conn->bev, EV_WRITE|EV_READ);
644 rs_packet_send (struct rs_packet *pkt, void *user_data)
646 struct rs_connection *conn = NULL;
653 if (_conn_is_open_p (conn))
656 if (_conn_open (conn, pkt))
661 assert (conn->active_peer);
662 assert (conn->fd >= 0);
664 conn->user_data = user_data;
665 bufferevent_setcb (conn->bev, NULL, _write_cb, _event_cb, pkt);
666 bufferevent_enable (conn->bev, EV_WRITE);
668 /* Do dispatch, unless the user wants to do it herself. */
669 if (!conn->user_dispatch_flag)
671 conn->callbacks.sent_cb = _wcb;
672 conn->user_data = pkt;
673 rs_debug (("%s: entering event loop\n", __func__));
674 err = event_base_dispatch (conn->evb);
676 return rs_err_conn_push_fl (pkt->conn, RSE_EVENT, __FILE__, __LINE__,
677 "event_base_dispatch: %s",
678 evutil_gai_strerror (err));
679 rs_debug (("%s: event loop done\n", __func__));
680 conn->callbacks.sent_cb = NULL;
681 conn->user_data = NULL;
683 if (!pkt->written_flag)
691 _rcb (struct rs_packet *packet, void *user_data)
693 struct rs_packet *pkt = (struct rs_packet *) user_data;
696 bufferevent_disable (pkt->conn->bev, EV_WRITE|EV_READ);
699 /* Special function used in libradsec blocking dispatching mode,
700 i.e. with socket set to block on read/write and with no libradsec
701 callbacks registered.
703 For any other use of libradsec, a the received_cb callback should
704 be registered in the callbacks member of struct rs_connection.
706 On successful reception, verification and decoding of a RADIUS
707 message, PKT_OUT will upon return point at a pointer to a struct
708 rs_packet containing the message.
710 If anything goes wrong or if the read times out (TODO: explain),
711 PKT_OUT will point at the NULL pointer and one or more errors are
712 pushed on the connection (available through rs_err_conn_pop()). */
715 rs_conn_receive_packet (struct rs_connection *conn,
716 struct rs_packet *request,
717 struct rs_packet **pkt_out)
720 struct rs_packet *pkt = NULL;
723 assert (conn->realm);
724 assert (!conn->user_dispatch_flag); /* Dispatching mode only. */
726 if (rs_packet_create (conn, pkt_out))
730 pkt->original = request;
734 assert (conn->active_peer);
735 assert (conn->fd >= 0);
737 bufferevent_setwatermark (conn->bev, EV_READ, RS_HEADER_LEN, 0);
738 bufferevent_setcb (conn->bev, _read_cb, NULL, _event_cb, pkt);
739 bufferevent_enable (conn->bev, EV_READ);
740 conn->callbacks.received_cb = _rcb;
741 conn->user_data = pkt;
744 rs_debug (("%s: entering event loop\n", __func__));
745 err = event_base_dispatch (conn->evb);
746 conn->callbacks.received_cb = NULL;
748 return rs_err_conn_push_fl (pkt->conn, RSE_EVENT, __FILE__, __LINE__,
749 "event_base_dispatch: %s",
750 evutil_gai_strerror (err));
751 rs_debug (("%s: event loop done\n", __func__));
753 if (!pkt->valid_flag)
757 rs_dump_packet (pkt);
760 pkt->original = NULL; /* FIXME: Why? */
765 rs_packet_add_attr(struct rs_packet *pkt, struct rs_attr *attr)
767 pairadd (&pkt->rpkt->vps, attr->vp);
771 struct radius_packet *
772 rs_packet_frpkt(struct rs_packet *pkt)
779 rs_packet_destroy(struct rs_packet *pkt)
783 // FIXME: memory leak! TODO: free all attributes
784 rad_free (&pkt->rpkt);
785 rs_free (pkt->conn->ctx, pkt);