2 * ircd-ratbox: A slightly useful ircd.
3 * s_auth.c: Functions for querying a users ident.
5 * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
6 * Copyright (C) 1996-2002 Hybrid Development Team
7 * Copyright (C) 2002-2005 ircd-ratbox development team
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
24 * $Id: s_auth.c 3354 2007-04-03 09:21:31Z nenolod $ */
28 * July 6, 1999 - Rewrote most of the code here. When a client connects
29 * to the server and passes initial socket validation checks, it
30 * is owned by this module (auth) which returns it to the rest of the
31 * server when dns and auth queries are finished. Until the client is
32 * released, the server does not know it exists and does not process
33 * any messages from it.
34 * --Bleep Thomas Helvey <tomh@inxpress.net>
42 #include "irc_string.h"
43 #include "sprintf_irc.h"
52 #include "blacklist.h"
55 * a bit different approach
56 * this replaces the original sendheader macros
59 static const char *HeaderMessages
[] =
61 ":*** Looking up your hostname...",
62 ":*** Found your hostname",
63 ":*** Couldn't look up your hostname",
64 ":*** Checking Ident",
65 ":*** Got Ident response",
66 ":*** No Ident response",
67 ":*** Your hostname is too long, ignoring hostname",
68 ":*** Your forward and reverse DNS do not match, ignoring hostname",
69 ":*** Cannot verify hostname validity, ignoring hostname",
86 #define sendheader(c, r) sendto_one_notice(c, HeaderMessages[(r)])
88 static rb_dlink_list auth_poll_list
;
89 static rb_bh
*auth_heap
;
90 static EVH timeout_auth_queries_event
;
92 static PF read_auth_reply
;
93 static CNCB auth_connect_callback
;
98 * Initialise the auth code
103 /* This hook takes a struct Client for its argument */
104 memset(&auth_poll_list
, 0, sizeof(auth_poll_list
));
105 rb_event_addish("timeout_auth_queries_event", timeout_auth_queries_event
, NULL
, 1);
106 auth_heap
= rb_bh_create(sizeof(struct AuthRequest
), LCLIENT_HEAP_SIZE
);
110 * make_auth_request - allocate a new auth request
112 static struct AuthRequest
*
113 make_auth_request(struct Client
*client
)
115 struct AuthRequest
*request
= rb_bh_alloc(auth_heap
);
116 client
->localClient
->auth_request
= request
;
118 request
->client
= client
;
119 request
->timeout
= rb_current_time() + ConfigFileEntry
.connect_timeout
;
124 * free_auth_request - cleanup auth request allocations
127 free_auth_request(struct AuthRequest
*request
)
129 rb_bh_free(auth_heap
, request
);
133 * release_auth_client - release auth client from auth system
134 * this adds the client into the local client lists so it can be read by
135 * the main io processing loop
138 release_auth_client(struct AuthRequest
*auth
)
140 struct Client
*client
= auth
->client
;
142 if(IsDNSPending(auth
) || IsDoingAuth(auth
))
145 client
->localClient
->auth_request
= NULL
;
146 rb_dlinkDelete(&auth
->node
, &auth_poll_list
);
147 free_auth_request(auth
);
148 if(client
->localClient
->F
->fd
> highest_fd
)
149 highest_fd
= client
->localClient
->F
->fd
;
152 * When a client has auth'ed, we want to start reading what it sends
153 * us. This is what read_packet() does.
156 client
->localClient
->allow_read
= MAX_FLOOD
;
157 rb_setflush(client
->localClient
->F
->fd
, 1000, flood_recalc
, client
);
158 rb_dlinkAddTail(client
, &client
->node
, &global_client_list
);
159 read_packet(client
->localClient
->F
->fd
, client
);
163 * auth_dns_callback - called when resolver query finishes
164 * if the query resulted in a successful search, hp will contain
165 * a non-null pointer, otherwise hp will be null.
166 * set the client on it's way to a connection completion, regardless
167 * of success of failure
170 auth_dns_callback(void *vptr
, struct DNSReply
*reply
)
172 struct AuthRequest
*auth
= (struct AuthRequest
*) vptr
;
173 ClearDNSPending(auth
);
175 /* XXX: this shouldn't happen, but it does. -nenolod */
176 if(auth
->client
->localClient
== NULL
)
178 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
179 "auth_dns_callback(): auth->client->localClient (%s) is NULL", get_client_name(auth
->client
, HIDE_IP
));
181 rb_dlinkDelete(&auth
->node
, &auth_poll_list
);
182 free_auth_request(auth
);
184 /* and they will silently drop through and all will hopefully be ok... -nenolod */
192 if(auth
->client
->localClient
->ip
.ss_family
== AF_INET
)
194 struct sockaddr_in
*ip
, *ip_fwd
;
196 ip
= (struct sockaddr_in
*) &auth
->client
->localClient
->ip
;
197 ip_fwd
= (struct sockaddr_in
*) &reply
->addr
;
199 if(ip
->sin_addr
.s_addr
!= ip_fwd
->sin_addr
.s_addr
)
201 sendheader(auth
->client
, REPORT_HOST_MISMATCH
);
206 else if(auth
->client
->localClient
->ip
.ss_family
== AF_INET6
)
208 struct sockaddr_in6
*ip
, *ip_fwd
;
210 ip
= (struct sockaddr_in6
*) &auth
->client
->localClient
->ip
;
211 ip_fwd
= (struct sockaddr_in6
*) &reply
->addr
;
213 if(memcmp(&ip
->sin6_addr
, &ip_fwd
->sin6_addr
, sizeof(struct in6_addr
)) != 0)
215 sendheader(auth
->client
, REPORT_HOST_MISMATCH
);
220 else /* can't verify it, don't know how. reject it. */
222 sendheader(auth
->client
, REPORT_HOST_UNKNOWN
);
226 if(good
&& strlen(reply
->h_name
) <= HOSTLEN
)
228 strlcpy(auth
->client
->host
, reply
->h_name
, sizeof(auth
->client
->host
));
229 sendheader(auth
->client
, REPORT_FIN_DNS
);
231 else if (strlen(reply
->h_name
) > HOSTLEN
)
232 sendheader(auth
->client
, REPORT_HOST_TOOLONG
);
235 sendheader(auth
->client
, REPORT_FAIL_DNS
);
237 release_auth_client(auth
);
241 * authsenderr - handle auth send errors
244 auth_error(struct AuthRequest
*auth
)
246 ++ServerStats
->is_abad
;
252 sendheader(auth
->client
, REPORT_FAIL_ID
);
254 release_auth_client(auth
);
258 * start_auth_query - Flag the client to show that an attempt to
259 * contact the ident server on
260 * the client's host. The connect and subsequently the socket are all put
261 * into 'non-blocking' mode. Should the connect or any later phase of the
262 * identifing process fail, it is aborted and the user is given a username
266 start_auth_query(struct AuthRequest
*auth
)
268 struct rb_sockaddr_storage localaddr
;
269 socklen_t locallen
= sizeof(struct rb_sockaddr_storage
);
273 if(IsAnyDead(auth
->client
))
276 family
= auth
->client
->localClient
->ip
.ss_family
;
277 if((fd
= rb_socket(family
, SOCK_STREAM
, 0, "ident")) == -1)
279 report_error("creating auth stream socket %s:%s",
280 get_client_name(auth
->client
, SHOW_IP
),
281 log_client_name(auth
->client
, SHOW_IP
), errno
);
282 ++ServerStats
->is_abad
;
287 * TBD: this is a pointless arbitrary limit .. we either have a socket or not. -nenolod
289 if((rb_get_maxconnections() - 10) < fd
)
291 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
292 "Can't allocate fd for auth on %s",
293 get_client_name(auth
->client
, SHOW_IP
));
298 sendheader(auth
->client
, REPORT_DO_ID
);
301 * get the local address of the client and bind to that to
302 * make the auth request. This used to be done only for
303 * ifdef VIRTUAL_HOST, but needs to be done for all clients
304 * since the ident request must originate from that same address--
305 * and machines with multiple IP addresses are common now
307 memset(&localaddr
, 0, locallen
);
308 getsockname(auth
->client
->localClient
->F
->fd
,
309 (struct sockaddr
*) &localaddr
, &locallen
);
311 mangle_mapped_sockaddr((struct sockaddr
*)&localaddr
);
313 if(localaddr
.ss_family
== AF_INET6
)
315 ((struct sockaddr_in6
*)&localaddr
)->sin6_port
= 0;
318 ((struct sockaddr_in
*)&localaddr
)->sin_port
= 0;
321 SetAuthConnect(auth
);
323 rb_connect_tcp(fd
, auth
->client
->sockhost
, 113,
324 (struct sockaddr
*) &localaddr
, GET_SS_LEN(localaddr
),
325 auth_connect_callback
, auth
,
326 localaddr
.ss_family
, GlobalSetOptions
.ident_timeout
);
327 return 1; /* We suceed here for now */
331 * GetValidIdent - parse ident query reply from identd server
333 * Inputs - pointer to ident buf
334 * Output - NULL if no valid ident found, otherwise pointer to name
338 GetValidIdent(char *buf
)
346 char *remotePortString
;
348 /* All this to get rid of a sscanf() fun. */
349 remotePortString
= buf
;
351 colon1Ptr
= strchr(remotePortString
, ':');
357 colon2Ptr
= strchr(colon1Ptr
, ':');
363 commaPtr
= strchr(remotePortString
, ',');
371 remp
= atoi(remotePortString
);
375 locp
= atoi(commaPtr
);
379 /* look for USERID bordered by first pair of colons */
380 if(!strstr(colon1Ptr
, "USERID"))
383 colon3Ptr
= strchr(colon2Ptr
, ':');
393 * start_auth - starts auth (identd) and dns queries for a client
396 start_auth(struct Client
*client
)
398 struct AuthRequest
*auth
= 0;
399 s_assert(0 != client
);
403 auth
= make_auth_request(client
);
405 auth
->dns_query
.ptr
= auth
;
406 auth
->dns_query
.callback
= auth_dns_callback
;
408 sendheader(client
, REPORT_DO_DNS
);
410 /* No DNS cache now, remember? -- adrian */
411 gethost_byaddr(&client
->localClient
->ip
, &auth
->dns_query
);
415 if(ConfigFileEntry
.disable_auth
== 0)
416 start_auth_query(auth
);
418 rb_dlinkAdd(auth
, &auth
->node
, &auth_poll_list
);
422 * timeout_auth_queries - timeout resolver and identd requests
423 * allow clients through if requests failed
426 timeout_auth_queries_event(void *notused
)
429 rb_dlink_node
*next_ptr
;
430 struct AuthRequest
*auth
;
432 RB_DLINK_FOREACH_SAFE(ptr
, next_ptr
, auth_poll_list
.head
)
436 if(auth
->timeout
< rb_current_time())
441 if(IsDoingAuth(auth
))
444 ++ServerStats
->is_abad
;
445 sendheader(auth
->client
, REPORT_FAIL_ID
);
446 auth
->client
->localClient
->auth_request
= NULL
;
448 if(IsDNSPending(auth
))
450 ClearDNSPending(auth
);
451 delete_resolver_queries(&auth
->dns_query
);
452 sendheader(auth
->client
, REPORT_FAIL_DNS
);
455 auth
->client
->localClient
->lasttime
= rb_current_time();
456 release_auth_client(auth
);
462 * auth_connect_callback() - deal with the result of rb_connect_tcp()
464 * If the connection failed, we simply close the auth fd and report
465 * a failure. If the connection suceeded send the ident server a query
466 * giving "theirport , ourport". The write is only attempted *once* so
467 * it is deemed to be a fail if the entire write doesn't write all the
468 * data given. This shouldnt be a problem since the socket should have
469 * a write buffer far greater than this message to store it in should
470 * problems arise. -avalon
473 auth_connect_callback(int fd
, int error
, void *data
)
475 struct AuthRequest
*auth
= data
;
476 struct sockaddr_in us
;
477 struct sockaddr_in them
;
479 socklen_t ulen
= sizeof(struct sockaddr_in
);
480 socklen_t tlen
= sizeof(struct sockaddr_in
);
482 /* Check the error */
485 /* We had an error during connection :( */
491 (auth
->client
->localClient
->F
->fd
, (struct sockaddr
*) &us
,
492 (socklen_t
*) & ulen
)
493 || getpeername(auth
->client
->localClient
->F
->fd
,
494 (struct sockaddr
*) &them
, (socklen_t
*) & tlen
))
496 ilog(L_IOERROR
, "auth get{sock,peer}name error for %s:%m",
497 log_client_name(auth
->client
, SHOW_IP
));
501 rb_snprintf(authbuf
, sizeof(authbuf
), "%u , %u\r\n",
502 (unsigned int) ntohs(them
.sin_port
), (unsigned int) ntohs(us
.sin_port
));
504 if(write(auth
->fd
, authbuf
, strlen(authbuf
)) == -1)
509 ClearAuthConnect(auth
);
510 SetAuthPending(auth
);
511 read_auth_reply(auth
->fd
, auth
);
516 * read_auth_reply - read the reply (if any) from the ident server
518 * We only give it one shot, if the reply isn't good the first time
519 * fail the authentication entirely. --Bleep
521 #define AUTH_BUFSIZ 128
524 read_auth_reply(int fd
, void *data
)
526 struct AuthRequest
*auth
= data
;
531 char buf
[AUTH_BUFSIZ
+ 1]; /* buffer to read auth reply into */
533 len
= read(auth
->fd
, buf
, AUTH_BUFSIZ
);
535 if(len
< 0 && ignoreErrno(errno
))
537 rb_setselect(fd
, FDLIST_IDLECLIENT
, COMM_SELECT_READ
, read_auth_reply
, auth
, 0);
545 if((s
= GetValidIdent(buf
)))
547 t
= auth
->client
->username
;
549 while (*s
== '~' || *s
== '^')
552 for (count
= USERLEN
; *s
&& count
; s
++)
558 if(!IsSpace(*s
) && *s
!= ':' && *s
!= '[')
574 ++ServerStats
->is_abad
;
575 strcpy(auth
->client
->username
, "unknown");
576 sendheader(auth
->client
, REPORT_FAIL_ID
);
580 sendheader(auth
->client
, REPORT_FIN_ID
);
581 ++ServerStats
->is_asuc
;
582 SetGotId(auth
->client
);
585 release_auth_client(auth
);
591 * delete_auth_queries()
595 delete_auth_queries(struct Client
*target_p
)
597 struct AuthRequest
*auth
;
599 if(target_p
== NULL
|| target_p
->localClient
== NULL
||
600 target_p
->localClient
->auth_request
== NULL
)
603 auth
= target_p
->localClient
->auth_request
;
604 target_p
->localClient
->auth_request
= NULL
;
606 if(IsDNSPending(auth
))
607 delete_resolver_queries(&auth
->dns_query
);
612 rb_dlinkDelete(&auth
->node
, &auth_poll_list
);
613 free_auth_request(auth
);