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root/svn/ircd-hybrid/trunk/src/auth.c

Comparing:
ircd-hybrid/trunk/src/s_auth.c (file contents), Revision 2916 by michael, Sat Jan 25 21:09:18 2014 UTC vs.
ircd-hybrid/trunk/src/auth.c (file contents), Revision 4815 by michael, Sat Nov 1 15:28:42 2014 UTC

#	Line 15 | Line 15
15		*
16		*  You should have received a copy of the GNU General Public License
17		*  along with this program; if not, write to the Free Software
18	<	*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
18	>	*  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19		*  USA
20		*/
21
22	<	/*! \file s_auth.c
22	>	/*! \file auth.c
23		* \brief Functions for querying a users ident.
24		* \version $Id$
25		*/
#	Line 39 | Line 39
39		#include "list.h"
40		#include "ircd_defs.h"
41		#include "fdlist.h"
42	<	#include "s_auth.h"
42	>	#include "auth.h"
43		#include "conf.h"
44		#include "client.h"
45		#include "event.h"
46	–	#include "hook.h"
46		#include "irc_string.h"
47		#include "ircd.h"
48		#include "packet.h"
49	<	#include "irc_res.h"
49	>	#include "res.h"
50		#include "s_bsd.h"
51		#include "log.h"
52		#include "send.h"
53		#include "mempool.h"
54
55
56	<	static const char *HeaderMessages[] =
56	>	static const char *const HeaderMessages[] =
57		{
58	<	":%s NOTICE AUTH :*** Looking up your hostname...",
59	<	":%s NOTICE AUTH :*** Found your hostname",
60	<	":%s NOTICE AUTH :*** Couldn't look up your hostname",
61	<	":%s NOTICE AUTH :*** Checking Ident",
62	<	":%s NOTICE AUTH :*** Got Ident response",
63	<	":%s NOTICE AUTH :*** No Ident response",
64	<	":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.",
65	<	":%s NOTICE AUTH :*** Your hostname is too long, ignoring hostname"
58	>	":*** Looking up your hostname",
59	>	":*** Found your hostname",
60	>	":*** Couldn't look up your hostname",
61	>	":*** Checking Ident",
62	>	":*** Got Ident response",
63	>	":*** No Ident response",
64	>	":*** Your forward and reverse DNS do not match, ignoring hostname",
65	>	":*** Your hostname is too long, ignoring hostname"
66		};
67
68		enum
#	Line 78 | Line 77 | enum
77		REPORT_HOST_TOOLONG
78		};
79
80	<	#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name)
80	>	#define sendheader(c, i) sendto_one_notice((c), &me, HeaderMessages[(i)])
81
82	<	static dlink_list auth_doing_list = { NULL, NULL, 0 };
82	>	static dlink_list auth_pending_list;
83	>	static void read_auth_reply(fde_t *, void *);
84	>	static void auth_connect_callback(fde_t *, int, void *);
85
85	–	static EVH timeout_auth_queries_event;
86	–
87	–	static PF read_auth_reply;
88	–	static CNCB auth_connect_callback;
89	–
90	–	/* auth_init
91	–	*
92	–	* Initialise the auth code
93	–	*/
94	–	void
95	–	auth_init(void)
96	–	{
97	–	eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
98	–	}
86
87		/*
88		* make_auth_request - allocate a new auth request
#	Line 103 | Line 90 | auth_init(void)
90		static struct AuthRequest *
91		make_auth_request(struct Client *client)
92		{
93	<	struct AuthRequest *request = &client->localClient->auth;
93	>	struct AuthRequest *request = &client->connection->auth;
94
95		memset(request, 0, sizeof(*request));
96
#	Line 126 | Line 113 | release_auth_client(struct AuthRequest *
113		if (IsDoingAuth(auth) || IsDNSPending(auth))
114		return;
115
116	<	if (dlinkFind(&auth_doing_list, auth))
117	<	dlinkDelete(&auth->node, &auth_doing_list);
116	>	if (IsInAuth(auth))
117	>	{
118	>	dlinkDelete(&auth->node, &auth_pending_list);
119	>	ClearInAuth(auth);
120	>	}
121
122		/*
123		* When a client has auth'ed, we want to start reading what it sends
124		* us. This is what read_packet() does.
125		*     -- adrian
126		*/
127	<	client->localClient->allow_read = MAX_FLOOD;
128	<	comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
139	<
140	<	dlinkAdd(client, &client->node, &global_client_list);
127	>	client->connection->allow_read = MAX_FLOOD;
128	>	comm_setflush(&client->connection->fd, 1000, flood_recalc, client);
129
130	<	client->localClient->since     = CurrentTime;
131	<	client->localClient->lasttime  = CurrentTime;
132	<	client->localClient->firsttime = CurrentTime;
130	>	client->connection->since     = CurrentTime;
131	>	client->connection->lasttime  = CurrentTime;
132	>	client->connection->firsttime = CurrentTime;
133		client->flags |= FLAGS_FINISHED_AUTH;
134
135	<	read_packet(&client->localClient->fd, client);
135	>	read_packet(&client->connection->fd, client);
136		}
137
138		/*
#	Line 155 | Line 143 | release_auth_client(struct AuthRequest *
143		* of success of failure
144		*/
145		static void
146	<	auth_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name)
146	>	auth_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name, size_t namelength)
147		{
148		struct AuthRequest *auth = vptr;
149
150		ClearDNSPending(auth);
151
152	<	if (name != NULL)
152	>	if (!EmptyString(name))
153		{
154		const struct sockaddr_in *v4, *v4dns;
167	–	#ifdef IPV6
155		const struct sockaddr_in6 *v6, *v6dns;
169	–	#endif
170	–	int good = 1;
156
157	<	#ifdef IPV6
173	<	if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
157	>	if (auth->client->connection->ip.ss.ss_family == AF_INET6)
158		{
159	<	v6 = (const struct sockaddr_in6 *)&auth->client->localClient->ip;
159	>	v6 = (const struct sockaddr_in6 *)&auth->client->connection->ip;
160		v6dns = (const struct sockaddr_in6 *)addr;
161	+
162		if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
163		{
164		sendheader(auth->client, REPORT_IP_MISMATCH);
165	<	good = 0;
165	>	release_auth_client(auth);
166	>	return;
167		}
168		}
169		else
184	–	#endif
170		{
171	<	v4 = (const struct sockaddr_in *)&auth->client->localClient->ip;
171	>	v4 = (const struct sockaddr_in *)&auth->client->connection->ip;
172		v4dns = (const struct sockaddr_in *)addr;
173	<	if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
173	>
174	>	if (v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
175		{
176		sendheader(auth->client, REPORT_IP_MISMATCH);
177	<	good = 0;
177	>	release_auth_client(auth);
178	>	return;
179		}
180		}
181	<	if (good && strlen(name) <= HOSTLEN)
181	>
182	>	if (namelength > HOSTLEN)
183	>	sendheader(auth->client, REPORT_HOST_TOOLONG);
184	>	else
185		{
186	<	strlcpy(auth->client->host, name,
197	<	sizeof(auth->client->host));
186	>	strlcpy(auth->client->host, name, sizeof(auth->client->host));
187		sendheader(auth->client, REPORT_FIN_DNS);
188		}
200	–	else if (strlen(name) > HOSTLEN)
201	–	sendheader(auth->client, REPORT_HOST_TOOLONG);
189		}
190		else
191		sendheader(auth->client, REPORT_FAIL_DNS);
#	Line 236 | Line 223 | start_auth_query(struct AuthRequest *aut
223		{
224		struct irc_ssaddr localaddr;
225		socklen_t locallen = sizeof(struct irc_ssaddr);
239	–	#ifdef IPV6
226		struct sockaddr_in6 *v6;
241	–	#else
242	–	struct sockaddr_in *v4;
243	–	#endif
227
228		/* open a socket of the same type as the client socket */
229	<	if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
229	>	if (comm_open(&auth->fd, auth->client->connection->ip.ss.ss_family,
230		SOCK_STREAM, 0, "ident") == -1)
231		{
232		report_error(L_ALL, "creating auth stream socket %s:%s",
233		get_client_name(auth->client, SHOW_IP), errno);
251	–	ilog(LOG_TYPE_IRCD, "Unable to create auth socket for %s",
252	–	get_client_name(auth->client, SHOW_IP));
234		++ServerStats.is_abad;
235		return 0;
236		}
#	Line 264 | Line 245 | start_auth_query(struct AuthRequest *aut
245		* and machines with multiple IP addresses are common now
246		*/
247		memset(&localaddr, 0, locallen);
248	<	getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
248	>	getsockname(auth->client->connection->fd.fd, (struct sockaddr*)&localaddr,
249		&locallen);
250
270	–	#ifdef IPV6
251		remove_ipv6_mapping(&localaddr);
252		v6 = (struct sockaddr_in6 *)&localaddr;
253		v6->sin6_port = htons(0);
274	–	#else
275	–	localaddr.ss_len = locallen;
276	–	v4 = (struct sockaddr_in *)&localaddr;
277	–	v4->sin_port = htons(0);
278	–	#endif
254		localaddr.ss_port = htons(0);
255
256	<	comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
256	>	comm_connect_tcp(&auth->fd, auth->client->sockhost, RFC1413_PORT,
257		(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
258	<	auth, auth->client->localClient->ip.ss.ss_family,
258	>	auth, auth->client->connection->ip.ss.ss_family,
259		GlobalSetOptions.ident_timeout);
260		return 1; /* We suceed here for now */
261		}
262
263		/*
289	–	* GetValidIdent - parse ident query reply from identd server
290	–	*
291	–	* Inputs        - pointer to ident buf
292	–	* Output        - NULL if no valid ident found, otherwise pointer to name
293	–	* Side effects  -
294	–	*/
295	–	/*
296	–	* A few questions have been asked about this mess, obviously
297	–	* it should have been commented better the first time.
298	–	* The original idea was to remove all references to libc from ircd-hybrid.
299	–	* Instead of having to write a replacement for sscanf(), I did a
300	–	* rather gruseome parser here so we could remove this function call.
301	–	* Note, that I had also removed a few floating point printfs as well (though
302	–	* now we are still stuck with a few...)
303	–	* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
304	–	* it would have been nice to remove some unneeded code.
305	–	* Oh well. If we don't remove libc stuff totally, then it would be
306	–	* far cleaner to use sscanf()
307	–	*
308	–	* - Dianora
309	–	*/
310	–	static char *
311	–	GetValidIdent(char *buf)
312	–	{
313	–	int   remp = 0;
314	–	int   locp = 0;
315	–	char* colon1Ptr;
316	–	char* colon2Ptr;
317	–	char* colon3Ptr;
318	–	char* commaPtr;
319	–	char* remotePortString;
320	–
321	–	/* All this to get rid of a sscanf() fun. */
322	–	remotePortString = buf;
323	–
324	–	if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
325	–	return 0;
326	–	*colon1Ptr = '\0';
327	–	colon1Ptr++;
328	–
329	–	if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
330	–	return 0;
331	–	*colon2Ptr = '\0';
332	–	colon2Ptr++;
333	–
334	–	if ((commaPtr = strchr(remotePortString, ',')) == NULL)
335	–	return 0;
336	–	*commaPtr = '\0';
337	–	commaPtr++;
338	–
339	–	if ((remp = atoi(remotePortString)) == 0)
340	–	return 0;
341	–
342	–	if ((locp = atoi(commaPtr)) == 0)
343	–	return 0;
344	–
345	–	/* look for USERID bordered by first pair of colons */
346	–	if (strstr(colon1Ptr, "USERID") == NULL)
347	–	return 0;
348	–
349	–	if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
350	–	return 0;
351	–	*colon3Ptr = '\0';
352	–	colon3Ptr++;
353	–	return (colon3Ptr);
354	–	}
355	–
356	–	/*
264		* start_auth
265		*
266		* inputs       - pointer to client to auth
#	Line 361 | Line 268 | GetValidIdent(char *buf)
268		* side effects - starts auth (identd) and dns queries for a client
269		*/
270		void
271	<	start_auth(struct Client *client)
271	>	start_auth(struct Client *client_p)
272		{
273		struct AuthRequest *auth = NULL;
274
275	<	assert(client != NULL);
275	>	assert(client_p);
276
277	<	auth = make_auth_request(client);
278	<	dlinkAdd(auth, &auth->node, &auth_doing_list);
277	>	auth = make_auth_request(client_p);
278	>	SetInAuth(auth);
279	>	dlinkAddTail(auth, &auth->node, &auth_pending_list);
280
281	<	sendheader(client, REPORT_DO_DNS);
281	>	sendheader(client_p, REPORT_DO_DNS);
282
283		SetDNSPending(auth);
284
285	<	if (ConfigFileEntry.disable_auth == 0)
285	>	if (ConfigGeneral.disable_auth == 0)
286		{
287		SetDoingAuth(auth);
288		start_auth_query(auth);
289		}
290
291	<	gethost_byaddr(auth_dns_callback, auth, &client->localClient->ip);
291	>	gethost_byaddr(auth_dns_callback, auth, &client_p->connection->ip);
292		}
293
294		/*
#	Line 390 | Line 298 | start_auth(struct Client *client)
298		static void
299		timeout_auth_queries_event(void *notused)
300		{
301	<	dlink_node *ptr = NULL, *next_ptr = NULL;
301	>	dlink_node *node = NULL, *node_next = NULL;
302
303	<	DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_list.head)
303	>	DLINK_FOREACH_SAFE(node, node_next, auth_pending_list.head)
304		{
305	<	struct AuthRequest *auth = ptr->data;
305	>	struct AuthRequest *auth = node->data;
306
307		if (auth->timeout > CurrentTime)
308	<	continue;
308	>	break;
309
310		if (IsDoingAuth(auth))
311		{
#	Line 414 | Line 322 | timeout_auth_queries_event(void *notused
322		sendheader(auth->client, REPORT_FAIL_DNS);
323		}
324
417	–	ilog(LOG_TYPE_IRCD, "DNS/AUTH timeout %s",
418	–	get_client_name(auth->client, SHOW_IP));
325		release_auth_client(auth);
326		}
327		}
#	Line 441 | Line 347 | auth_connect_callback(fde_t *fd, int err
347		socklen_t ulen = sizeof(struct irc_ssaddr);
348		socklen_t tlen = sizeof(struct irc_ssaddr);
349		uint16_t uport, tport;
444	–	#ifdef IPV6
350		struct sockaddr_in6 *v6;
446	–	#else
447	–	struct sockaddr_in *v4;
448	–	#endif
351
352		if (error != COMM_OK)
353		{
#	Line 453 | Line 355 | auth_connect_callback(fde_t *fd, int err
355		return;
356		}
357
358	<	if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *)&us,
359	<	&ulen) ||
458	<	getpeername(auth->client->localClient->fd.fd, (struct sockaddr *)&them,
459	<	&tlen))
358	>	if (getsockname(auth->client->connection->fd.fd, (struct sockaddr *)&us, &ulen) ||
359	>	getpeername(auth->client->connection->fd.fd, (struct sockaddr *)&them, &tlen))
360		{
361		ilog(LOG_TYPE_IRCD, "auth get{sock,peer}name error for %s",
362	<	get_client_name(auth->client, SHOW_IP));
362	>	get_client_name(auth->client, SHOW_IP));
363		auth_error(auth);
364		return;
365		}
366
467	–	#ifdef IPV6
367		v6 = (struct sockaddr_in6 *)&us;
368		uport = ntohs(v6->sin6_port);
369		v6 = (struct sockaddr_in6 *)&them;
370		tport = ntohs(v6->sin6_port);
371		remove_ipv6_mapping(&us);
372		remove_ipv6_mapping(&them);
474	–	#else
475	–	v4 = (struct sockaddr_in *)&us;
476	–	uport = ntohs(v4->sin_port);
477	–	v4 = (struct sockaddr_in *)&them;
478	–	tport = ntohs(v4->sin_port);
479	–	us.ss_len = ulen;
480	–	them.ss_len = tlen;
481	–	#endif
373
374	<	snprintf(authbuf, sizeof(authbuf), "%u , %u\r\n", tport, uport);
374	>	snprintf(authbuf, sizeof(authbuf), "%u, %u\r\n", tport, uport);
375
376		if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
377		{
#	Line 488 | Line 379 | auth_connect_callback(fde_t *fd, int err
379		return;
380		}
381
382	<	read_auth_reply(&auth->fd, auth);
382	>	comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
383	>	}
384	>
385	>	/** Enum used to index ident reply fields in a human-readable way. */
386	>	enum IdentReplyFields
387	>	{
388	>	IDENT_PORT_NUMBERS,
389	>	IDENT_REPLY_TYPE,
390	>	IDENT_OS_TYPE,
391	>	IDENT_INFO,
392	>	USERID_TOKEN_COUNT
393	>	};
394	>
395	>	/** Parse an ident reply line and extract the userid from it.
396	>	* \param reply The ident reply line.
397	>	* \return The userid, or NULL on parse failure.
398	>	*/
399	>	static const char *
400	>	check_ident_reply(char *reply)
401	>	{
402	>	char *token = NULL, *end = NULL;
403	>	char *vector[USERID_TOKEN_COUNT];
404	>	int count = token_vector(reply, ':', vector, USERID_TOKEN_COUNT);
405	>
406	>	if (USERID_TOKEN_COUNT != count)
407	>	return NULL;
408	>
409	>	/*
410	>	* Second token is the reply type
411	>	*/
412	>	token = vector[IDENT_REPLY_TYPE];
413	>
414	>	if (EmptyString(token))
415	>	return NULL;
416	>
417	>	while (IsSpace(*token))
418	>	++token;
419	>
420	>	if (strncmp(token, "USERID", 6))
421	>	return NULL;
422	>
423	>	/*
424	>	* Third token is the os type
425	>	*/
426	>	token = vector[IDENT_OS_TYPE];
427	>
428	>	if (EmptyString(token))
429	>	return NULL;
430	>
431	>	while (IsSpace(*token))
432	>	++token;
433	>
434	>	/*
435	>	* Unless "OTHER" is specified as the operating system type, the server
436	>	* is expected to return the "normal" user identification of the owner
437	>	* of this connection. "Normal" in this context may be taken to mean a
438	>	* string of characters which uniquely identifies the connection owner
439	>	* such as a user identifier assigned by the system administrator and
440	>	* used by such user as a mail identifier, or as the "user" part of a
441	>	* user/password pair used to gain access to system resources. When an
442	>	* operating system is specified (e.g., anything but "OTHER"), the user
443	>	* identifier is expected to be in a more or less immediately useful
444	>	* form - e.g., something that could be used as an argument to "finger"
445	>	* or as a mail address.
446	>	*/
447	>	if (!strncmp(token, "OTHER", 5))
448	>	return NULL;
449	>
450	>	/*
451	>	* Fourth token is the username
452	>	*/
453	>	token = vector[IDENT_INFO];
454	>
455	>	if (EmptyString(token))
456	>	return NULL;
457	>
458	>	while (IsSpace(*token))
459	>	++token;
460	>
461	>	while (*token == '~' || *token == '^')
462	>	++token;
463	>
464	>	/*
465	>	* Look for the end of the username, terminators are '\0, @, <SPACE>, :'
466	>	*/
467	>	for (end = token; *end; ++end)
468	>	if (IsSpace(*end) || '@' == *end || ':' == *end)
469	>	break;
470	>	*end = '\0';
471	>
472	>	return token;
473		}
474
475		/*
#	Line 497 | Line 478 | auth_connect_callback(fde_t *fd, int err
478		* We only give it one shot, if the reply isn't good the first time
479		* fail the authentication entirely. --Bleep
480		*/
500	–	#define AUTH_BUFSIZ 128
501	–
481		static void
482		read_auth_reply(fde_t *fd, void *data)
483		{
484		struct AuthRequest *auth = data;
485	<	char *s = NULL;
486	<	char *t = NULL;
487	<	int len;
509	<	int count;
510	<	char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
511	<
512	<	/* Why?
513	<	* Well, recv() on many POSIX systems is a per-packet operation,
514	<	* and we do not necessarily want this, because on lowspec machines,
515	<	* the ident response may come back fragmented, thus resulting in an
516	<	* invalid ident response, even if the ident response was really OK.
517	<	*
518	<	* So PLEASE do not change this code to recv without being aware of the
519	<	* consequences.
520	<	*
521	<	*    --nenolod
522	<	*/
523	<	len = read(fd->fd, buf, AUTH_BUFSIZ);
524	<
525	<	if (len < 0)
526	<	{
527	<	if (ignoreErrno(errno))
528	<	comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
529	<	else
530	<	auth_error(auth);
531	<	return;
532	<	}
485	>	const char *username = NULL;
486	>	ssize_t len = 0;
487	>	char buf[RFC1413_BUFSIZ + 1];
488
489	<	if (len > 0)
489	>	if ((len = recv(fd->fd, buf, RFC1413_BUFSIZ, 0)) > 0)
490		{
491		buf[len] = '\0';
492	<
538	<	if ((s = GetValidIdent(buf)))
539	<	{
540	<	t = auth->client->username;
541	<
542	<	while (*s == '~' || *s == '^')
543	<	s++;
544	<
545	<	for (count = USERLEN; *s && count; s++)
546	<	{
547	<	if (*s == '@')
548	<	break;
549	<	if (!IsSpace(*s) && *s != ':' && *s != '[')
550	<	{
551	<	*t++ = *s;
552	<	count--;
553	<	}
554	<	}
555	<
556	<	*t = '\0';
557	<	}
492	>	username = check_ident_reply(buf);
493		}
494
495		fd_close(fd);
496
497		ClearAuth(auth);
498
499	<	if (s == NULL)
499	>	if (EmptyString(username))
500		{
501		sendheader(auth->client, REPORT_FAIL_ID);
502		++ServerStats.is_abad;
503		}
504		else
505		{
506	+	strlcpy(auth->client->username, username, sizeof(auth->client->username));
507		sendheader(auth->client, REPORT_FIN_ID);
508		++ServerStats.is_asuc;
509		SetGotId(auth->client);
#	Line 588 | Line 524 | delete_auth(struct AuthRequest *auth)
524		if (IsDoingAuth(auth))
525		fd_close(&auth->fd);
526
527	<	if (dlinkFind(&auth_doing_list, auth))
528	<	dlinkDelete(&auth->node, &auth_doing_list);
527	>	if (IsInAuth(auth))
528	>	{
529	>	dlinkDelete(&auth->node, &auth_pending_list);
530	>	ClearInAuth(auth);
531	>	}
532	>	}
533	>
534	>	/* auth_init
535	>	*
536	>	* Initialise the auth code
537	>	*/
538	>	void
539	>	auth_init(void)
540	>	{
541	>	static struct event timeout_auth_queries =
542	>	{
543	>	.name = "timeout_auth_queries_event",
544	>	.handler = timeout_auth_queries_event,
545	>	.when = 1
546	>	};
547	>
548	>	event_add(&timeout_auth_queries, NULL);
549		}

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