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>
51 #include "blacklist.h"
56 struct Client
*client
; /* pointer to client struct for request */
57 struct DNSQuery dns_query
; /* DNS Query */
58 unsigned int flags
; /* current state of request */
59 rb_fde_t
*F
; /* file descriptor for auth queries */
60 time_t timeout
; /* time when query expires */
66 * flag values for AuthRequest
67 * NAMESPACE: AM_xxx - Authentication Module
69 #define AM_AUTH_CONNECTING (1 << 0)
70 #define AM_AUTH_PENDING (1 << 1)
71 #define AM_DNS_PENDING (1 << 2)
73 #define SetDNSPending(x) ((x)->flags |= AM_DNS_PENDING)
74 #define ClearDNSPending(x) ((x)->flags &= ~AM_DNS_PENDING)
75 #define IsDNSPending(x) ((x)->flags & AM_DNS_PENDING)
77 #define SetAuthConnect(x) ((x)->flags |= AM_AUTH_CONNECTING)
78 #define ClearAuthConnect(x) ((x)->flags &= ~AM_AUTH_CONNECTING)
79 #define IsAuthConnect(x) ((x)->flags & AM_AUTH_CONNECTING)
81 #define SetAuthPending(x) ((x)->flags |= AM_AUTH_PENDING)
82 #define ClearAuthPending(x) ((x)->flags &= AM_AUTH_PENDING)
83 #define IsAuthPending(x) ((x)->flags & AM_AUTH_PENDING)
85 #define ClearAuth(x) ((x)->flags &= ~(AM_AUTH_PENDING | AM_AUTH_CONNECTING))
86 #define IsDoingAuth(x) ((x)->flags & (AM_AUTH_PENDING | AM_AUTH_CONNECTING))
89 * a bit different approach
90 * this replaces the original sendheader macros
93 static const char *HeaderMessages
[] =
95 ":*** Looking up your hostname...",
96 ":*** Found your hostname",
97 ":*** Couldn't look up your hostname",
98 ":*** Checking Ident",
99 ":*** Got Ident response",
100 ":*** No Ident response",
101 ":*** Your hostname is too long, ignoring hostname",
102 ":*** Your forward and reverse DNS do not match, ignoring hostname",
103 ":*** Cannot verify hostname validity, ignoring hostname",
115 REPORT_HOST_MISMATCH
,
120 #define sendheader(c, r) sendto_one_notice(c, HeaderMessages[(r)])
122 static rb_dlink_list auth_poll_list
;
123 static rb_bh
*auth_heap
;
124 static EVH timeout_auth_queries_event
;
126 static PF read_auth_reply
;
127 static CNCB auth_connect_callback
;
132 * Initialise the auth code
137 /* This hook takes a struct Client for its argument */
138 memset(&auth_poll_list
, 0, sizeof(auth_poll_list
));
139 rb_event_addish("timeout_auth_queries_event", timeout_auth_queries_event
, NULL
, 1);
140 auth_heap
= rb_bh_create(sizeof(struct AuthRequest
), LCLIENT_HEAP_SIZE
, "auth_heap");
144 * make_auth_request - allocate a new auth request
146 static struct AuthRequest
*
147 make_auth_request(struct Client
*client
)
149 struct AuthRequest
*request
= rb_bh_alloc(auth_heap
);
150 client
->localClient
->auth_request
= request
;
152 request
->client
= client
;
153 request
->timeout
= rb_current_time() + ConfigFileEntry
.connect_timeout
;
158 * free_auth_request - cleanup auth request allocations
161 free_auth_request(struct AuthRequest
*request
)
163 rb_bh_free(auth_heap
, request
);
167 * release_auth_client - release auth client from auth system
168 * this adds the client into the local client lists so it can be read by
169 * the main io processing loop
172 release_auth_client(struct AuthRequest
*auth
)
174 struct Client
*client
= auth
->client
;
176 if(IsDNSPending(auth
) || IsDoingAuth(auth
))
179 client
->localClient
->auth_request
= NULL
;
180 rb_dlinkDelete(&auth
->node
, &auth_poll_list
);
181 free_auth_request(auth
);
184 * When a client has auth'ed, we want to start reading what it sends
185 * us. This is what read_packet() does.
188 client
->localClient
->allow_read
= MAX_FLOOD
;
189 rb_dlinkAddTail(client
, &client
->node
, &global_client_list
);
190 read_packet(client
->localClient
->F
, client
);
194 * auth_dns_callback - called when resolver query finishes
195 * if the query resulted in a successful search, hp will contain
196 * a non-null pointer, otherwise hp will be null.
197 * set the client on it's way to a connection completion, regardless
198 * of success of failure
201 auth_dns_callback(void *vptr
, struct DNSReply
*reply
)
203 struct AuthRequest
*auth
= (struct AuthRequest
*) vptr
;
204 ClearDNSPending(auth
);
206 /* XXX: this shouldn't happen, but it does. -nenolod */
207 if(auth
->client
->localClient
== NULL
)
209 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
210 "auth_dns_callback(): auth->client->localClient (%s) is NULL", get_client_name(auth
->client
, HIDE_IP
));
212 rb_dlinkDelete(&auth
->node
, &auth_poll_list
);
213 free_auth_request(auth
);
215 /* and they will silently drop through and all will hopefully be ok... -nenolod */
223 if(auth
->client
->localClient
->ip
.ss_family
== AF_INET
)
225 struct sockaddr_in
*ip
, *ip_fwd
;
227 ip
= (struct sockaddr_in
*) &auth
->client
->localClient
->ip
;
228 ip_fwd
= (struct sockaddr_in
*) &reply
->addr
;
230 if(ip
->sin_addr
.s_addr
!= ip_fwd
->sin_addr
.s_addr
)
232 sendheader(auth
->client
, REPORT_HOST_MISMATCH
);
237 else if(auth
->client
->localClient
->ip
.ss_family
== AF_INET6
)
239 struct sockaddr_in6
*ip
, *ip_fwd
;
241 ip
= (struct sockaddr_in6
*) &auth
->client
->localClient
->ip
;
242 ip_fwd
= (struct sockaddr_in6
*) &reply
->addr
;
244 if(memcmp(&ip
->sin6_addr
, &ip_fwd
->sin6_addr
, sizeof(struct in6_addr
)) != 0)
246 sendheader(auth
->client
, REPORT_HOST_MISMATCH
);
251 else /* can't verify it, don't know how. reject it. */
253 sendheader(auth
->client
, REPORT_HOST_UNKNOWN
);
257 if(good
&& strlen(reply
->h_name
) <= HOSTLEN
)
259 rb_strlcpy(auth
->client
->host
, reply
->h_name
, sizeof(auth
->client
->host
));
260 sendheader(auth
->client
, REPORT_FIN_DNS
);
262 else if (strlen(reply
->h_name
) > HOSTLEN
)
263 sendheader(auth
->client
, REPORT_HOST_TOOLONG
);
266 sendheader(auth
->client
, REPORT_FAIL_DNS
);
268 release_auth_client(auth
);
272 * authsenderr - handle auth send errors
275 auth_error(struct AuthRequest
*auth
)
277 ++ServerStats
.is_abad
;
283 sendheader(auth
->client
, REPORT_FAIL_ID
);
285 release_auth_client(auth
);
289 * start_auth_query - Flag the client to show that an attempt to
290 * contact the ident server on
291 * the client's host. The connect and subsequently the socket are all put
292 * into 'non-blocking' mode. Should the connect or any later phase of the
293 * identifing process fail, it is aborted and the user is given a username
297 start_auth_query(struct AuthRequest
*auth
)
299 struct rb_sockaddr_storage localaddr
, destaddr
;
303 if(IsAnyDead(auth
->client
))
306 family
= auth
->client
->localClient
->ip
.ss_family
;
307 if((F
= rb_socket(family
, SOCK_STREAM
, 0, "ident")) == NULL
)
309 ilog_error("creating auth stream socket");
310 ++ServerStats
.is_abad
;
315 * TBD: this is a pointless arbitrary limit .. we either have a socket or not. -nenolod
317 if((maxconnections
- 10) < rb_get_fd(F
))
319 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
320 "Can't allocate fd for auth on %s",
321 get_client_name(auth
->client
, SHOW_IP
));
326 sendheader(auth
->client
, REPORT_DO_ID
);
329 * get the local address of the client and bind to that to
330 * make the auth request. This used to be done only for
331 * ifdef VIRTUAL_HOST, but needs to be done for all clients
332 * since the ident request must originate from that same address--
333 * and machines with multiple IP addresses are common now
335 localaddr
= auth
->client
->preClient
->lip
;
337 /* XXX mangle_mapped_sockaddr((struct sockaddr *)&localaddr); */
339 if(localaddr
.ss_family
== AF_INET6
)
341 auth
->lport
= ntohs(((struct sockaddr_in6
*)&localaddr
)->sin6_port
);
342 ((struct sockaddr_in6
*)&localaddr
)->sin6_port
= 0;
347 auth
->lport
= ntohs(((struct sockaddr_in
*)&localaddr
)->sin_port
);
348 ((struct sockaddr_in
*)&localaddr
)->sin_port
= 0;
351 destaddr
= auth
->client
->localClient
->ip
;
353 if(localaddr
.ss_family
== AF_INET6
)
355 auth
->rport
= ntohs(((struct sockaddr_in6
*)&destaddr
)->sin6_port
);
356 ((struct sockaddr_in6
*)&destaddr
)->sin6_port
= htons(113);
361 auth
->rport
= ntohs(((struct sockaddr_in
*)&destaddr
)->sin_port
);
362 ((struct sockaddr_in
*)&destaddr
)->sin_port
= htons(113);
366 SetAuthConnect(auth
);
368 rb_connect_tcp(F
, (struct sockaddr
*)&destaddr
,
369 (struct sockaddr
*) &localaddr
, GET_SS_LEN(&localaddr
),
370 auth_connect_callback
, auth
,
371 GlobalSetOptions
.ident_timeout
);
372 return 1; /* We suceed here for now */
376 * GetValidIdent - parse ident query reply from identd server
378 * Inputs - pointer to ident buf
379 * Output - NULL if no valid ident found, otherwise pointer to name
383 GetValidIdent(char *buf
)
391 char *remotePortString
;
393 /* All this to get rid of a sscanf() fun. */
394 remotePortString
= buf
;
396 colon1Ptr
= strchr(remotePortString
, ':');
402 colon2Ptr
= strchr(colon1Ptr
, ':');
408 commaPtr
= strchr(remotePortString
, ',');
416 remp
= atoi(remotePortString
);
420 locp
= atoi(commaPtr
);
424 /* look for USERID bordered by first pair of colons */
425 if(!strstr(colon1Ptr
, "USERID"))
428 colon3Ptr
= strchr(colon2Ptr
, ':');
438 * start_auth - starts auth (identd) and dns queries for a client
441 start_auth(struct Client
*client
)
443 struct AuthRequest
*auth
= 0;
444 s_assert(0 != client
);
448 auth
= make_auth_request(client
);
450 auth
->dns_query
.ptr
= auth
;
451 auth
->dns_query
.callback
= auth_dns_callback
;
453 sendheader(client
, REPORT_DO_DNS
);
455 /* No DNS cache now, remember? -- adrian */
456 gethost_byaddr(&client
->localClient
->ip
, &auth
->dns_query
);
460 if(ConfigFileEntry
.disable_auth
== 0)
461 start_auth_query(auth
);
463 rb_dlinkAdd(auth
, &auth
->node
, &auth_poll_list
);
467 * timeout_auth_queries - timeout resolver and identd requests
468 * allow clients through if requests failed
471 timeout_auth_queries_event(void *notused
)
474 rb_dlink_node
*next_ptr
;
475 struct AuthRequest
*auth
;
477 RB_DLINK_FOREACH_SAFE(ptr
, next_ptr
, auth_poll_list
.head
)
481 if(auth
->timeout
< rb_current_time())
486 if(IsDoingAuth(auth
))
489 ++ServerStats
.is_abad
;
490 sendheader(auth
->client
, REPORT_FAIL_ID
);
491 auth
->client
->localClient
->auth_request
= NULL
;
493 if(IsDNSPending(auth
))
495 ClearDNSPending(auth
);
496 delete_resolver_queries(&auth
->dns_query
);
497 sendheader(auth
->client
, REPORT_FAIL_DNS
);
500 auth
->client
->localClient
->lasttime
= rb_current_time();
501 release_auth_client(auth
);
507 * auth_connect_callback() - deal with the result of rb_connect_tcp()
509 * If the connection failed, we simply close the auth fd and report
510 * a failure. If the connection suceeded send the ident server a query
511 * giving "theirport , ourport". The write is only attempted *once* so
512 * it is deemed to be a fail if the entire write doesn't write all the
513 * data given. This shouldnt be a problem since the socket should have
514 * a write buffer far greater than this message to store it in should
515 * problems arise. -avalon
518 auth_connect_callback(rb_fde_t
*F
, int error
, void *data
)
520 struct AuthRequest
*auth
= data
;
523 /* Check the error */
526 /* We had an error during connection :( */
531 rb_snprintf(authbuf
, sizeof(authbuf
), "%u , %u\r\n",
532 auth
->rport
, auth
->lport
);
534 if(rb_write(auth
->F
, authbuf
, strlen(authbuf
)) != strlen(authbuf
))
539 ClearAuthConnect(auth
);
540 SetAuthPending(auth
);
541 read_auth_reply(auth
->F
, auth
);
546 * read_auth_reply - read the reply (if any) from the ident server
548 * We only give it one shot, if the reply isn't good the first time
549 * fail the authentication entirely. --Bleep
551 #define AUTH_BUFSIZ 128
554 read_auth_reply(rb_fde_t
*F
, void *data
)
556 struct AuthRequest
*auth
= data
;
561 char buf
[AUTH_BUFSIZ
+ 1]; /* buffer to read auth reply into */
563 len
= rb_read(F
, buf
, AUTH_BUFSIZ
);
565 if(len
< 0 && rb_ignore_errno(errno
))
567 rb_setselect(F
, RB_SELECT_READ
, read_auth_reply
, auth
);
575 if((s
= GetValidIdent(buf
)))
577 t
= auth
->client
->username
;
579 while (*s
== '~' || *s
== '^')
582 for (count
= USERLEN
; *s
&& count
; s
++)
588 if(!IsSpace(*s
) && *s
!= ':' && *s
!= '[')
604 ++ServerStats
.is_abad
;
605 strcpy(auth
->client
->username
, "unknown");
606 sendheader(auth
->client
, REPORT_FAIL_ID
);
610 sendheader(auth
->client
, REPORT_FIN_ID
);
611 ++ServerStats
.is_asuc
;
612 SetGotId(auth
->client
);
615 release_auth_client(auth
);
621 * delete_auth_queries()
625 delete_auth_queries(struct Client
*target_p
)
627 struct AuthRequest
*auth
;
629 if(target_p
== NULL
|| target_p
->localClient
== NULL
||
630 target_p
->localClient
->auth_request
== NULL
)
633 auth
= target_p
->localClient
->auth_request
;
634 target_p
->localClient
->auth_request
= NULL
;
636 if(IsDNSPending(auth
))
637 delete_resolver_queries(&auth
->dns_query
);
642 rb_dlinkDelete(&auth
->node
, &auth_poll_list
);
643 free_auth_request(auth
);