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 /* Add Message-Authenticator, RFC 2869. */
50 /* FIXME: Make Message-Authenticator optional? */
51 vp = paircreate (PW_MESSAGE_AUTHENTICATOR, PW_TYPE_OCTETS);
53 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
54 "paircreate: %s", fr_strerror ());
55 pairadd (&pkt->rpkt->vps, vp);
57 if (rad_encode (pkt->rpkt, NULL, pkt->conn->active_peer->secret))
58 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
59 "rad_encode: %s", fr_strerror ());
60 if (rad_sign (pkt->rpkt, NULL, pkt->conn->active_peer->secret))
61 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
62 "rad_sign: %s", fr_strerror ());
65 char host[80], serv[80];
67 getnameinfo (pkt->conn->active_peer->addr->ai_addr,
68 pkt->conn->active_peer->addr->ai_addrlen,
69 host, sizeof(host), serv, sizeof(serv),
70 0 /* NI_NUMERICHOST|NI_NUMERICSERV*/);
71 rs_debug (("%s: about to send this to %s:%s:\n", __func__, host, serv));
76 err = bufferevent_write (pkt->conn->bev, pkt->rpkt->data,
79 return rs_err_conn_push_fl (pkt->conn, RSE_EVENT, __FILE__, __LINE__,
80 "bufferevent_write: %s",
81 evutil_gai_strerror (err));
86 _on_connect (struct rs_connection *conn)
88 conn->is_connected = 1;
89 rs_debug (("%s: %p connected\n", __func__, conn->active_peer));
90 evtimer_del (conn->tev);
91 if (conn->callbacks.connected_cb)
92 conn->callbacks.connected_cb (conn->user_data);
96 _on_disconnect (struct rs_connection *conn)
98 conn->is_connecting = 0;
99 conn->is_connected = 0;
100 rs_debug (("%s: %p disconnected\n", __func__, conn->active_peer));
101 if (conn->callbacks.disconnected_cb)
102 conn->callbacks.disconnected_cb (conn->user_data);
106 _event_cb (struct bufferevent *bev, short events, void *ctx)
108 struct rs_packet *pkt = (struct rs_packet *)ctx;
109 struct rs_connection *conn = NULL;
110 struct rs_peer *p = NULL;
112 #if defined (RS_ENABLE_TLS)
113 unsigned long tlserr = 0;
118 assert (pkt->conn->active_peer);
120 p = conn->active_peer;
122 conn->is_connecting = 0;
123 if (events & BEV_EVENT_CONNECTED)
127 rs_debug (("%s: error sending\n", __func__));
129 else if (events & BEV_EVENT_EOF)
131 _on_disconnect (conn);
133 else if (events & BEV_EVENT_TIMEOUT)
135 rs_debug (("%s: %p times out on %s\n", __func__, p,
136 (events & BEV_EVENT_READING) ? "read" : "write"));
137 rs_err_conn_push_fl (pkt->conn, RSE_TIMEOUT_IO, __FILE__, __LINE__, NULL);
139 else if (events & BEV_EVENT_ERROR)
141 sockerr = evutil_socket_geterror (conn->active_peer->fd);
142 if (sockerr == 0) /* FIXME: True that errno == 0 means closed? */
144 _on_disconnect (conn);
148 rs_err_conn_push_fl (pkt->conn, RSE_SOCKERR, __FILE__, __LINE__,
149 "%d: socket error %d (%s)",
152 evutil_socket_error_to_string (sockerr));
153 rs_debug (("%s: socket error on fd %d: %s (%d)\n", __func__,
155 evutil_socket_error_to_string (sockerr),
158 #if defined (RS_ENABLE_TLS)
159 if (conn->tls_ssl) /* FIXME: correct check? */
161 for (tlserr = bufferevent_get_openssl_error (conn->bev);
163 tlserr = bufferevent_get_openssl_error (conn->bev))
165 rs_debug (("%s: openssl error: %s\n", __func__,
166 ERR_error_string (tlserr, NULL)));
167 rs_err_conn_push_fl (pkt->conn, RSE_SSLERR, __FILE__, __LINE__,
168 ERR_error_string (tlserr, NULL));
171 #endif /* RS_ENABLE_TLS */
176 if (events & BEV_EVENT_ERROR && events != BEV_EVENT_ERROR)
177 rs_debug (("%s: BEV_EVENT_ERROR and more: 0x%x\n", __func__, events));
182 _write_cb (struct bufferevent *bev, void *ctx)
184 struct rs_packet *pkt = (struct rs_packet *) ctx;
189 if (pkt->conn->callbacks.sent_cb)
190 pkt->conn->callbacks.sent_cb (pkt->conn->user_data);
193 /* Read one RADIUS packet header. Return !0 on error. A return value
194 of 0 means that we need more data. */
196 _read_header (struct rs_packet *pkt)
200 n = bufferevent_read (pkt->conn->bev, pkt->hdr, RS_HEADER_LEN);
201 if (n == RS_HEADER_LEN)
203 pkt->hdr_read_flag = 1;
204 pkt->rpkt->data_len = (pkt->hdr[2] << 8) + pkt->hdr[3];
205 if (pkt->rpkt->data_len < 20 || pkt->rpkt->data_len > 4096)
207 bufferevent_free (pkt->conn->bev); /* Close connection. */
208 return rs_err_conn_push (pkt->conn, RSE_INVALID_PKT,
209 "invalid packet length: %d",
210 pkt->rpkt->data_len);
212 pkt->rpkt->data = rs_malloc (pkt->conn->ctx, pkt->rpkt->data_len);
213 if (!pkt->rpkt->data)
215 bufferevent_free (pkt->conn->bev); /* Close connection. */
216 return rs_err_conn_push_fl (pkt->conn, RSE_NOMEM, __FILE__, __LINE__,
219 memcpy (pkt->rpkt->data, pkt->hdr, RS_HEADER_LEN);
220 bufferevent_setwatermark (pkt->conn->bev, EV_READ,
221 pkt->rpkt->data_len - RS_HEADER_LEN, 0);
222 rs_debug (("%s: packet header read, total pkt len=%d\n",
223 __func__, pkt->rpkt->data_len));
227 rs_debug (("%s: buffer frozen while reading header\n", __func__));
229 else /* Error: libevent gave us less than the low watermark. */
231 bufferevent_free (pkt->conn->bev); /* Close connection. */
232 return rs_err_conn_push_fl (pkt->conn, RSE_INTERNAL, __FILE__, __LINE__,
233 "got %d octets reading header", n);
240 _read_packet (struct rs_packet *pkt)
244 rs_debug (("%s: trying to read %d octets of packet data\n", __func__,
245 pkt->rpkt->data_len - RS_HEADER_LEN));
247 n = bufferevent_read (pkt->conn->bev,
248 pkt->rpkt->data + RS_HEADER_LEN,
249 pkt->rpkt->data_len - RS_HEADER_LEN);
251 rs_debug (("%s: read %ld octets of packet data\n", __func__, n));
253 if (n == pkt->rpkt->data_len - RS_HEADER_LEN)
255 bufferevent_disable (pkt->conn->bev, EV_READ);
256 rs_debug (("%s: complete packet read\n", __func__));
257 pkt->hdr_read_flag = 0;
258 memset (pkt->hdr, 0, sizeof(*pkt->hdr));
260 /* Checks done by rad_packet_ok:
261 - lenghts (FIXME: checks really ok for tcp?)
263 - attribute lengths >= 2
264 - attribute sizes adding up correctly */
265 if (!rad_packet_ok (pkt->rpkt, 0) != 0)
267 bufferevent_free (pkt->conn->bev); /* Close connection. */
268 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
269 "invalid packet: %s", fr_strerror ());
272 /* TODO: Verify that reception of an unsolicited response packet
273 results in connection being closed. */
275 /* If we have a request to match this response against, verify
276 and decode the response. */
279 /* Verify header and message authenticator. */
280 if (rad_verify (pkt->rpkt, pkt->original->rpkt,
281 pkt->conn->active_peer->secret))
283 bufferevent_free (pkt->conn->bev); /* Close connection. */
284 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
285 "rad_verify: %s", fr_strerror ());
288 /* Decode and decrypt. */
289 if (rad_decode (pkt->rpkt, pkt->original->rpkt,
290 pkt->conn->active_peer->secret))
292 bufferevent_free (pkt->conn->bev); /* Close connection. */
293 return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
294 "rad_decode: %s", fr_strerror ());
299 /* Find out what happens if there's data left in the buffer. */
302 rest = evbuffer_get_length (bufferevent_get_input (pkt->conn->bev));
304 rs_debug (("%s: returning with %d octets left in buffer\n", __func__,
309 /* Hand over message to user, changes ownership of pkt. Don't
310 touch it afterwards -- it might have been freed. */
311 if (pkt->conn->callbacks.received_cb)
312 pkt->conn->callbacks.received_cb (pkt, pkt->conn->user_data);
314 else if (n < 0) /* Buffer frozen. */
315 rs_debug (("%s: buffer frozen when reading packet\n", __func__));
316 else /* Short packet. */
317 rs_debug (("%s: waiting for another %d octets\n", __func__,
318 pkt->rpkt->data_len - RS_HEADER_LEN - n));
323 /* Read callback for TCP.
325 Read exactly one RADIUS message from BEV and store it in struct
326 rs_packet passed in CTX (hereby called 'pkt').
328 Verify the received packet against pkt->original, if !NULL.
330 Inform upper layer about successful reception of valid RADIUS
331 message by invoking conn->callbacks.recevied_cb(), if !NULL. */
333 _read_cb (struct bufferevent *bev, void *user_data)
335 struct rs_packet *pkt = (struct rs_packet *) user_data;
341 pkt->rpkt->sockfd = pkt->conn->fd;
342 pkt->rpkt->vps = NULL;
344 if (!pkt->hdr_read_flag)
345 if (_read_header (pkt))
351 _evlog_cb (int severity, const char *msg)
356 case _EVENT_LOG_DEBUG:
357 #if !defined (DEBUG_LEVENT)
365 case _EVENT_LOG_WARN:
375 fprintf (stderr, "libevent: [%s] %s\n", sevstr, msg); /* FIXME: stderr? */
379 _init_evb (struct rs_connection *conn)
385 event_enable_debug_mode ();
387 event_set_log_callback (_evlog_cb);
388 conn->evb = event_base_new ();
390 return rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,
397 _init_socket (struct rs_connection *conn, struct rs_peer *p)
403 conn->fd = socket (p->addr->ai_family, p->addr->ai_socktype,
404 p->addr->ai_protocol);
406 return rs_err_conn_push_fl (conn, RSE_SOCKERR, __FILE__, __LINE__,
408 errno, strerror (errno));
409 if (evutil_make_socket_nonblocking (conn->fd) < 0)
411 evutil_closesocket (conn->fd);
413 return rs_err_conn_push_fl (conn, RSE_SOCKERR, __FILE__, __LINE__,
414 "evutil_make_socket_nonblocking: %d (%s)",
415 errno, strerror (errno));
420 static struct rs_peer *
421 _pick_peer (struct rs_connection *conn)
425 if (conn->active_peer)
426 conn->active_peer = conn->active_peer->next; /* Next. */
427 if (!conn->active_peer)
428 conn->active_peer = conn->peers; /* From the top. */
430 return conn->active_peer;
434 _conn_timeout_cb (int fd, short event, void *data)
436 struct rs_connection *conn;
439 conn = (struct rs_connection *) data;
441 if (event & EV_TIMEOUT)
443 rs_debug (("%s: connection timeout on %p (fd %d) connecting to %p\n",
444 __func__, conn, conn->fd, conn->active_peer));
445 conn->is_connecting = 0;
446 rs_err_conn_push_fl (conn, RSE_TIMEOUT_IO, __FILE__, __LINE__, NULL);
451 _set_timeout (struct rs_connection *conn)
456 conn->tev = evtimer_new (conn->evb, _conn_timeout_cb, conn);
458 return rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,
460 tv.tv_sec = conn->realm->timeout;
462 evtimer_add (conn->tev, &tv);
468 _init_bev (struct rs_connection *conn, struct rs_peer *peer)
473 switch (conn->realm->type)
475 case RS_CONN_TYPE_UDP:
477 /* NOTE: We know this is wrong for several reasons, most notably
478 because libevent doesn't work as expected with UDP. The
479 timeout handling is wrong too. */
480 case RS_CONN_TYPE_TCP:
481 conn->bev = bufferevent_socket_new (conn->evb, conn->fd, 0);
483 return rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,
484 "bufferevent_socket_new");
487 #if defined (RS_ENABLE_TLS)
488 case RS_CONN_TYPE_TLS:
489 if (rs_tls_init (conn))
491 /* Would be convenient to pass BEV_OPT_CLOSE_ON_FREE but things
492 seem to break when be_openssl_ctrl() (in libevent) calls
493 SSL_set_bio() after BIO_new_socket() with flag=1. */
495 bufferevent_openssl_socket_new (conn->evb, conn->fd, conn->tls_ssl,
496 BUFFEREVENT_SSL_CONNECTING, 0);
498 return rs_err_conn_push_fl (conn, RSE_EVENT, __FILE__, __LINE__,
499 "bufferevent_openssl_socket_new");
502 case RS_CONN_TYPE_DTLS:
503 return rs_err_conn_push_fl (conn, RSE_NOSYS, __FILE__, __LINE__, NULL);
504 #endif /* RS_ENABLE_TLS */
507 return rs_err_conn_push_fl (conn, RSE_INTERNAL, __FILE__, __LINE__,
508 "%s: unknown connection type: %d", __func__,
516 _do_connect (struct rs_connection *conn)
522 assert (conn->active_peer);
523 p = conn->active_peer;
527 char host[80], serv[80];
529 getnameinfo (p->addr->ai_addr,
531 host, sizeof(host), serv, sizeof(serv),
532 0 /* NI_NUMERICHOST|NI_NUMERICSERV*/);
533 rs_debug (("%s: connecting to %s:%s\n", __func__, host, serv));
538 err = bufferevent_socket_connect (p->conn->bev, p->addr->ai_addr,
539 p->addr->ai_addrlen);
541 rs_err_conn_push_fl (p->conn, RSE_EVENT, __FILE__, __LINE__,
542 "bufferevent_socket_connect: %s",
543 evutil_gai_strerror (err));
545 p->conn->is_connecting = 1;
549 _conn_open(struct rs_connection *conn, struct rs_packet *pkt)
551 if (_init_evb (conn))
554 if (!conn->active_peer)
556 if (!conn->active_peer)
557 return rs_err_conn_push_fl (conn, RSE_NOPEER, __FILE__, __LINE__, NULL);
559 if (_init_socket (conn, conn->active_peer))
562 if (_init_bev (conn, conn->active_peer))
565 if (!conn->is_connected)
566 if (!conn->is_connecting)
573 _conn_is_open_p (struct rs_connection *conn)
575 return conn->active_peer && conn->is_connected;
578 /* Public functions. */
580 rs_packet_create (struct rs_connection *conn, struct rs_packet **pkt_out)
587 rpkt = rad_alloc (1);
589 return rs_err_conn_push (conn, RSE_NOMEM, __func__);
590 rpkt->id = conn->nextid++;
592 p = (struct rs_packet *) malloc (sizeof (struct rs_packet));
596 return rs_err_conn_push (conn, RSE_NOMEM, __func__);
598 memset (p, 0, sizeof (struct rs_packet));
607 rs_packet_create_authn_request (struct rs_connection *conn,
608 struct rs_packet **pkt_out,
609 const char *user_name, const char *user_pw)
611 struct rs_packet *pkt;
612 struct rs_attr *attr;
614 if (rs_packet_create (conn, pkt_out))
617 pkt->rpkt->code = PW_AUTHENTICATION_REQUEST;
621 if (rs_attr_create (conn, &attr, "User-Name", user_name))
623 rs_packet_add_attr (pkt, attr);
627 if (rs_attr_create (conn, &attr, "User-Password", user_pw))
629 rs_packet_add_attr (pkt, attr);
636 /* User callback used when we're dispatching for user. */
638 _wcb (void *user_data)
640 struct rs_packet *pkt = (struct rs_packet *) user_data;
642 pkt->written_flag = 1;
643 bufferevent_disable (pkt->conn->bev, EV_WRITE|EV_READ);
647 rs_packet_send (struct rs_packet *pkt, void *user_data)
649 struct rs_connection *conn = NULL;
656 if (_conn_is_open_p (conn))
659 if (_conn_open (conn, pkt))
664 assert (conn->active_peer);
665 assert (conn->fd >= 0);
667 conn->user_data = user_data;
668 bufferevent_setcb (conn->bev, NULL, _write_cb, _event_cb, pkt);
669 bufferevent_enable (conn->bev, EV_WRITE);
671 /* Do dispatch, unless the user wants to do it herself. */
672 if (!conn->user_dispatch_flag)
674 conn->callbacks.sent_cb = _wcb;
675 conn->user_data = pkt;
676 rs_debug (("%s: entering event loop\n", __func__));
677 err = event_base_dispatch (conn->evb);
679 return rs_err_conn_push_fl (pkt->conn, RSE_EVENT, __FILE__, __LINE__,
680 "event_base_dispatch: %s",
681 evutil_gai_strerror (err));
682 rs_debug (("%s: event loop done\n", __func__));
683 conn->callbacks.sent_cb = NULL;
684 conn->user_data = NULL;
686 if (!pkt->written_flag)
694 _rcb (struct rs_packet *packet, void *user_data)
696 struct rs_packet *pkt = (struct rs_packet *) user_data;
699 bufferevent_disable (pkt->conn->bev, EV_WRITE|EV_READ);
702 /* Special function used in libradsec blocking dispatching mode,
703 i.e. with socket set to block on read/write and with no libradsec
704 callbacks registered.
706 For any other use of libradsec, a the received_cb callback should
707 be registered in the callbacks member of struct rs_connection.
709 On successful reception, verification and decoding of a RADIUS
710 message, PKT_OUT will upon return point at a pointer to a struct
711 rs_packet containing the message.
713 If anything goes wrong or if the read times out (TODO: explain),
714 PKT_OUT will point at the NULL pointer and one or more errors are
715 pushed on the connection (available through rs_err_conn_pop()). */
718 rs_conn_receive_packet (struct rs_connection *conn,
719 struct rs_packet *request,
720 struct rs_packet **pkt_out)
723 struct rs_packet *pkt = NULL;
726 assert (conn->realm);
727 assert (!conn->user_dispatch_flag); /* Dispatching mode only. */
729 if (rs_packet_create (conn, pkt_out))
733 pkt->original = request;
737 assert (conn->active_peer);
738 assert (conn->fd >= 0);
740 bufferevent_setwatermark (conn->bev, EV_READ, RS_HEADER_LEN, 0);
741 bufferevent_setcb (conn->bev, _read_cb, NULL, _event_cb, pkt);
742 bufferevent_enable (conn->bev, EV_READ);
743 conn->callbacks.received_cb = _rcb;
744 conn->user_data = pkt;
747 rs_debug (("%s: entering event loop\n", __func__));
748 err = event_base_dispatch (conn->evb);
749 conn->callbacks.received_cb = NULL;
751 return rs_err_conn_push_fl (pkt->conn, RSE_EVENT, __FILE__, __LINE__,
752 "event_base_dispatch: %s",
753 evutil_gai_strerror (err));
754 rs_debug (("%s: event loop done\n", __func__));
756 if (!pkt->valid_flag)
760 rs_dump_packet (pkt);
763 pkt->original = NULL; /* FIXME: Why? */
768 rs_packet_add_attr (struct rs_packet *pkt, struct rs_attr *attr)
770 pairadd (&pkt->rpkt->vps, attr->vp);
774 struct radius_packet *
775 rs_packet_frpkt (struct rs_packet *pkt)
782 rs_packet_destroy (struct rs_packet *pkt)
786 // FIXME: memory leak! TODO: free all attributes
787 rad_free (&pkt->rpkt);
788 rs_free (pkt->conn->ctx, pkt);