| 1 |
/* |
| 2 |
* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). |
| 3 |
* s_auth.c: Functions for querying a users ident. |
| 4 |
* |
| 5 |
* Copyright (C) 2002 by the past and present ircd coders, and others. |
| 6 |
* |
| 7 |
* This program is free software; you can redistribute it and/or modify |
| 8 |
* it under the terms of the GNU General Public License as published by |
| 9 |
* the Free Software Foundation; either version 2 of the License, or |
| 10 |
* (at your option) any later version. |
| 11 |
* |
| 12 |
* This program is distributed in the hope that it will be useful, |
| 13 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 |
* GNU General Public License for more details. |
| 16 |
* |
| 17 |
* You should have received a copy of the GNU General Public License |
| 18 |
* along with this program; if not, write to the Free Software |
| 19 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 20 |
* USA |
| 21 |
* |
| 22 |
* $Id$ |
| 23 |
*/ |
| 24 |
|
| 25 |
/* |
| 26 |
* Changes: |
| 27 |
* July 6, 1999 - Rewrote most of the code here. When a client connects |
| 28 |
* to the server and passes initial socket validation checks, it |
| 29 |
* is owned by this module (auth) which returns it to the rest of the |
| 30 |
* server when dns and auth queries are finished. Until the client is |
| 31 |
* released, the server does not know it exists and does not process |
| 32 |
* any messages from it. |
| 33 |
* --Bleep Thomas Helvey <tomh@inxpress.net> |
| 34 |
*/ |
| 35 |
#include "stdinc.h" |
| 36 |
#include "tools.h" |
| 37 |
#include "list.h" |
| 38 |
#include "s_auth.h" |
| 39 |
#include "s_conf.h" |
| 40 |
#include "client.h" |
| 41 |
#include "common.h" |
| 42 |
#include "event.h" |
| 43 |
#include "fdlist.h" /* fdlist_add */ |
| 44 |
#include "hook.h" |
| 45 |
#include "irc_string.h" |
| 46 |
#include "sprintf_irc.h" |
| 47 |
#include "ircd.h" |
| 48 |
#include "numeric.h" |
| 49 |
#include "packet.h" |
| 50 |
#include "irc_res.h" |
| 51 |
#include "s_bsd.h" |
| 52 |
#include "s_log.h" |
| 53 |
#include "send.h" |
| 54 |
#include "memory.h" |
| 55 |
|
| 56 |
static const char *HeaderMessages[] = { |
| 57 |
":%s NOTICE AUTH :*** Looking up your hostname...", |
| 58 |
":%s NOTICE AUTH :*** Found your hostname", |
| 59 |
":%s NOTICE AUTH :*** Couldn't look up your hostname", |
| 60 |
":%s NOTICE AUTH :*** Checking Ident", |
| 61 |
":%s NOTICE AUTH :*** Got Ident response", |
| 62 |
":%s NOTICE AUTH :*** No Ident response", |
| 63 |
":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.", |
| 64 |
":%s NOTICE AUTH :*** Your hostname is too long, ignoring hostname" |
| 65 |
}; |
| 66 |
|
| 67 |
enum { |
| 68 |
REPORT_DO_DNS, |
| 69 |
REPORT_FIN_DNS, |
| 70 |
REPORT_FAIL_DNS, |
| 71 |
REPORT_DO_ID, |
| 72 |
REPORT_FIN_ID, |
| 73 |
REPORT_FAIL_ID, |
| 74 |
REPORT_IP_MISMATCH, |
| 75 |
REPORT_HOST_TOOLONG |
| 76 |
}; |
| 77 |
|
| 78 |
#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name) |
| 79 |
|
| 80 |
/* |
| 81 |
* Ok, the original was confusing. |
| 82 |
* Now there are two lists, an auth request can be on both at the same time |
| 83 |
* or only on one or the other. |
| 84 |
* - Dianora |
| 85 |
*/ |
| 86 |
static dlink_list auth_doing_dns_list = { NULL, NULL, 0 }; |
| 87 |
static dlink_list auth_doing_ident_list = { NULL, NULL, 0 }; |
| 88 |
|
| 89 |
static EVH timeout_auth_queries_event; |
| 90 |
|
| 91 |
static PF read_auth_reply; |
| 92 |
static CNCB auth_connect_callback; |
| 93 |
static CBFUNC start_auth; |
| 94 |
|
| 95 |
struct Callback *auth_cb = NULL; |
| 96 |
|
| 97 |
/* init_auth() |
| 98 |
* |
| 99 |
* Initialise the auth code |
| 100 |
*/ |
| 101 |
void |
| 102 |
init_auth(void) |
| 103 |
{ |
| 104 |
auth_cb = register_callback("start_auth", start_auth); |
| 105 |
eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1); |
| 106 |
} |
| 107 |
|
| 108 |
/* |
| 109 |
* make_auth_request - allocate a new auth request |
| 110 |
*/ |
| 111 |
static struct AuthRequest * |
| 112 |
make_auth_request(struct Client *client) |
| 113 |
{ |
| 114 |
struct AuthRequest *request = MyMalloc(sizeof(struct AuthRequest)); |
| 115 |
|
| 116 |
request->client = client; |
| 117 |
request->timeout = CurrentTime + CONNECTTIMEOUT; |
| 118 |
|
| 119 |
return request; |
| 120 |
} |
| 121 |
|
| 122 |
/* |
| 123 |
* release_auth_client - release auth client from auth system |
| 124 |
* this adds the client into the local client lists so it can be read by |
| 125 |
* the main io processing loop |
| 126 |
*/ |
| 127 |
void |
| 128 |
release_auth_client(struct Client *client) |
| 129 |
{ |
| 130 |
/* |
| 131 |
* When a client has auth'ed, we want to start reading what it sends |
| 132 |
* us. This is what read_packet() does. |
| 133 |
* -- adrian |
| 134 |
*/ |
| 135 |
client->localClient->allow_read = MAX_FLOOD; |
| 136 |
comm_setflush(&client->localClient->fd, 1000, flood_recalc, client); |
| 137 |
|
| 138 |
if ((client->node.prev != NULL) || (client->node.next != NULL)) |
| 139 |
{ |
| 140 |
sendto_realops_flags(UMODE_ALL, L_OPER, |
| 141 |
"already linked %s at %s:%d", client->name, |
| 142 |
__FILE__, __LINE__); |
| 143 |
ilog(L_ERROR, "already linked %s at %s:%d", client->name, |
| 144 |
__FILE__, __LINE__); |
| 145 |
assert(0==5); |
| 146 |
} |
| 147 |
else |
| 148 |
dlinkAdd(client, &client->node, &global_client_list); |
| 149 |
|
| 150 |
client->since = client->lasttime = client->firsttime = CurrentTime; |
| 151 |
client->flags |= FLAGS_FINISHED_AUTH; |
| 152 |
|
| 153 |
read_packet(&client->localClient->fd, client); |
| 154 |
} |
| 155 |
|
| 156 |
/* |
| 157 |
* auth_dns_callback - called when resolver query finishes |
| 158 |
* if the query resulted in a successful search, hp will contain |
| 159 |
* a non-null pointer, otherwise hp will be null. |
| 160 |
* set the client on it's way to a connection completion, regardless |
| 161 |
* of success of failure |
| 162 |
*/ |
| 163 |
static void |
| 164 |
auth_dns_callback(void *vptr, struct DNSReply *reply) |
| 165 |
{ |
| 166 |
struct AuthRequest *auth = (struct AuthRequest *)vptr; |
| 167 |
|
| 168 |
dlinkDelete(&auth->dns_node, &auth_doing_dns_list); |
| 169 |
ClearDNSPending(auth); |
| 170 |
|
| 171 |
if (reply != NULL) |
| 172 |
{ |
| 173 |
struct sockaddr_in *v4, *v4dns; |
| 174 |
#ifdef IPV6 |
| 175 |
struct sockaddr_in6 *v6, *v6dns; |
| 176 |
#endif |
| 177 |
int good = 1; |
| 178 |
|
| 179 |
#ifdef IPV6 |
| 180 |
if (auth->client->localClient->ip.ss.ss_family == AF_INET6) |
| 181 |
{ |
| 182 |
v6 = (struct sockaddr_in6 *)&auth->client->localClient->ip; |
| 183 |
v6dns = (struct sockaddr_in6 *)&reply->addr; |
| 184 |
if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0) |
| 185 |
{ |
| 186 |
sendheader(auth->client, REPORT_IP_MISMATCH); |
| 187 |
good = 0; |
| 188 |
} |
| 189 |
} |
| 190 |
else |
| 191 |
#endif |
| 192 |
{ |
| 193 |
v4 = (struct sockaddr_in *)&auth->client->localClient->ip; |
| 194 |
v4dns = (struct sockaddr_in *)&reply->addr; |
| 195 |
if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr) |
| 196 |
{ |
| 197 |
sendheader(auth->client, REPORT_IP_MISMATCH); |
| 198 |
good = 0; |
| 199 |
} |
| 200 |
} |
| 201 |
if (good && strlen(reply->h_name) <= HOSTLEN) |
| 202 |
{ |
| 203 |
strlcpy(auth->client->host, reply->h_name, |
| 204 |
sizeof(auth->client->host)); |
| 205 |
sendheader(auth->client, REPORT_FIN_DNS); |
| 206 |
} |
| 207 |
else if (strlen(reply->h_name) > HOSTLEN) |
| 208 |
sendheader(auth->client, REPORT_HOST_TOOLONG); |
| 209 |
} |
| 210 |
else |
| 211 |
sendheader(auth->client, REPORT_FAIL_DNS); |
| 212 |
|
| 213 |
MyFree(auth->client->localClient->dns_query); |
| 214 |
auth->client->localClient->dns_query = NULL; |
| 215 |
|
| 216 |
if (!IsDoingAuth(auth)) |
| 217 |
{ |
| 218 |
struct Client *client_p = auth->client; |
| 219 |
MyFree(auth); |
| 220 |
release_auth_client(client_p); |
| 221 |
} |
| 222 |
} |
| 223 |
|
| 224 |
/* |
| 225 |
* authsenderr - handle auth send errors |
| 226 |
*/ |
| 227 |
static void |
| 228 |
auth_error(struct AuthRequest *auth) |
| 229 |
{ |
| 230 |
++ServerStats.is_abad; |
| 231 |
|
| 232 |
fd_close(&auth->fd); |
| 233 |
|
| 234 |
dlinkDelete(&auth->ident_node, &auth_doing_ident_list); |
| 235 |
ClearAuth(auth); |
| 236 |
|
| 237 |
sendheader(auth->client, REPORT_FAIL_ID); |
| 238 |
|
| 239 |
if (!IsDNSPending(auth) && !IsCrit(auth)) |
| 240 |
{ |
| 241 |
release_auth_client(auth->client); |
| 242 |
MyFree(auth); |
| 243 |
} |
| 244 |
} |
| 245 |
|
| 246 |
/* |
| 247 |
* start_auth_query - Flag the client to show that an attempt to |
| 248 |
* contact the ident server on |
| 249 |
* the client's host. The connect and subsequently the socket are all put |
| 250 |
* into 'non-blocking' mode. Should the connect or any later phase of the |
| 251 |
* identifing process fail, it is aborted and the user is given a username |
| 252 |
* of "unknown". |
| 253 |
*/ |
| 254 |
static int |
| 255 |
start_auth_query(struct AuthRequest *auth) |
| 256 |
{ |
| 257 |
struct irc_ssaddr localaddr; |
| 258 |
socklen_t locallen = sizeof(struct irc_ssaddr); |
| 259 |
#ifdef IPV6 |
| 260 |
struct sockaddr_in6 *v6; |
| 261 |
#else |
| 262 |
struct sockaddr_in *v4; |
| 263 |
#endif |
| 264 |
|
| 265 |
/* open a socket of the same type as the client socket */ |
| 266 |
if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family, |
| 267 |
SOCK_STREAM, 0, "ident") == -1) |
| 268 |
{ |
| 269 |
report_error(L_ALL, "creating auth stream socket %s:%s", |
| 270 |
get_client_name(auth->client, SHOW_IP), errno); |
| 271 |
ilog(L_ERROR, "Unable to create auth socket for %s", |
| 272 |
get_client_name(auth->client, SHOW_IP)); |
| 273 |
++ServerStats.is_abad; |
| 274 |
return 0; |
| 275 |
} |
| 276 |
|
| 277 |
sendheader(auth->client, REPORT_DO_ID); |
| 278 |
|
| 279 |
/* |
| 280 |
* get the local address of the client and bind to that to |
| 281 |
* make the auth request. This used to be done only for |
| 282 |
* ifdef VIRTUAL_HOST, but needs to be done for all clients |
| 283 |
* since the ident request must originate from that same address-- |
| 284 |
* and machines with multiple IP addresses are common now |
| 285 |
*/ |
| 286 |
memset(&localaddr, 0, locallen); |
| 287 |
getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr, |
| 288 |
&locallen); |
| 289 |
|
| 290 |
#ifdef IPV6 |
| 291 |
remove_ipv6_mapping(&localaddr); |
| 292 |
v6 = (struct sockaddr_in6 *)&localaddr; |
| 293 |
v6->sin6_port = htons(0); |
| 294 |
#else |
| 295 |
localaddr.ss_len = locallen; |
| 296 |
v4 = (struct sockaddr_in *)&localaddr; |
| 297 |
v4->sin_port = htons(0); |
| 298 |
#endif |
| 299 |
localaddr.ss_port = htons(0); |
| 300 |
|
| 301 |
SetDoingAuth(auth); |
| 302 |
dlinkAdd(auth, &auth->ident_node, &auth_doing_ident_list); |
| 303 |
|
| 304 |
comm_connect_tcp(&auth->fd, auth->client->sockhost, 113, |
| 305 |
(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback, |
| 306 |
auth, auth->client->localClient->ip.ss.ss_family, |
| 307 |
GlobalSetOptions.ident_timeout); |
| 308 |
return 1; /* We suceed here for now */ |
| 309 |
} |
| 310 |
|
| 311 |
/* |
| 312 |
* GetValidIdent - parse ident query reply from identd server |
| 313 |
* |
| 314 |
* Inputs - pointer to ident buf |
| 315 |
* Output - NULL if no valid ident found, otherwise pointer to name |
| 316 |
* Side effects - |
| 317 |
*/ |
| 318 |
/* |
| 319 |
* A few questions have been asked about this mess, obviously |
| 320 |
* it should have been commented better the first time. |
| 321 |
* The original idea was to remove all references to libc from ircd-hybrid. |
| 322 |
* Instead of having to write a replacement for sscanf(), I did a |
| 323 |
* rather gruseome parser here so we could remove this function call. |
| 324 |
* Note, that I had also removed a few floating point printfs as well (though |
| 325 |
* now we are still stuck with a few...) |
| 326 |
* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib |
| 327 |
* it would have been nice to remove some unneeded code. |
| 328 |
* Oh well. If we don't remove libc stuff totally, then it would be |
| 329 |
* far cleaner to use sscanf() |
| 330 |
* |
| 331 |
* - Dianora |
| 332 |
*/ |
| 333 |
static char * |
| 334 |
GetValidIdent(char *buf) |
| 335 |
{ |
| 336 |
int remp = 0; |
| 337 |
int locp = 0; |
| 338 |
char* colon1Ptr; |
| 339 |
char* colon2Ptr; |
| 340 |
char* colon3Ptr; |
| 341 |
char* commaPtr; |
| 342 |
char* remotePortString; |
| 343 |
|
| 344 |
/* All this to get rid of a sscanf() fun. */ |
| 345 |
remotePortString = buf; |
| 346 |
|
| 347 |
if ((colon1Ptr = strchr(remotePortString,':')) == NULL) |
| 348 |
return 0; |
| 349 |
*colon1Ptr = '\0'; |
| 350 |
colon1Ptr++; |
| 351 |
|
| 352 |
if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL) |
| 353 |
return 0; |
| 354 |
*colon2Ptr = '\0'; |
| 355 |
colon2Ptr++; |
| 356 |
|
| 357 |
if ((commaPtr = strchr(remotePortString, ',')) == NULL) |
| 358 |
return 0; |
| 359 |
*commaPtr = '\0'; |
| 360 |
commaPtr++; |
| 361 |
|
| 362 |
if ((remp = atoi(remotePortString)) == 0) |
| 363 |
return 0; |
| 364 |
|
| 365 |
if ((locp = atoi(commaPtr)) == 0) |
| 366 |
return 0; |
| 367 |
|
| 368 |
/* look for USERID bordered by first pair of colons */ |
| 369 |
if (strstr(colon1Ptr, "USERID") == NULL) |
| 370 |
return 0; |
| 371 |
|
| 372 |
if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL) |
| 373 |
return 0; |
| 374 |
*colon3Ptr = '\0'; |
| 375 |
colon3Ptr++; |
| 376 |
return (colon3Ptr); |
| 377 |
} |
| 378 |
|
| 379 |
/* |
| 380 |
* start_auth |
| 381 |
* |
| 382 |
* inputs - pointer to client to auth |
| 383 |
* output - NONE |
| 384 |
* side effects - starts auth (identd) and dns queries for a client |
| 385 |
*/ |
| 386 |
static void * |
| 387 |
start_auth(va_list args) |
| 388 |
{ |
| 389 |
struct Client *client = va_arg(args, struct Client *); |
| 390 |
struct AuthRequest *auth = NULL; |
| 391 |
|
| 392 |
assert(client != NULL); |
| 393 |
|
| 394 |
auth = make_auth_request(client); |
| 395 |
SetCrit(auth); |
| 396 |
|
| 397 |
client->localClient->dns_query = MyMalloc(sizeof(struct DNSQuery)); |
| 398 |
client->localClient->dns_query->ptr = auth; |
| 399 |
client->localClient->dns_query->callback = auth_dns_callback; |
| 400 |
|
| 401 |
sendheader(client, REPORT_DO_DNS); |
| 402 |
|
| 403 |
if (ConfigFileEntry.disable_auth == 0) |
| 404 |
start_auth_query(auth); |
| 405 |
|
| 406 |
/* auth order changed, before gethost_byaddr can immediately call |
| 407 |
* dns callback under win32 when the lookup cannot be started. |
| 408 |
* And that would do MyFree(auth) etc -adx */ |
| 409 |
SetDNSPending(auth); |
| 410 |
dlinkAdd(auth, &auth->dns_node, &auth_doing_dns_list); |
| 411 |
ClearCrit(auth); |
| 412 |
gethost_byaddr(&client->localClient->ip, client->localClient->dns_query); |
| 413 |
|
| 414 |
return NULL; |
| 415 |
} |
| 416 |
|
| 417 |
/* |
| 418 |
* timeout_auth_queries - timeout resolver and identd requests |
| 419 |
* allow clients through if requests failed |
| 420 |
*/ |
| 421 |
static void |
| 422 |
timeout_auth_queries_event(void *notused) |
| 423 |
{ |
| 424 |
dlink_node *ptr; |
| 425 |
dlink_node *next_ptr; |
| 426 |
struct AuthRequest* auth; |
| 427 |
|
| 428 |
DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head) |
| 429 |
{ |
| 430 |
auth = ptr->data; |
| 431 |
|
| 432 |
if (auth->timeout <= CurrentTime) |
| 433 |
{ |
| 434 |
fd_close(&auth->fd); |
| 435 |
|
| 436 |
++ServerStats.is_abad; |
| 437 |
sendheader(auth->client, REPORT_FAIL_ID); |
| 438 |
|
| 439 |
if (IsDNSPending(auth)) |
| 440 |
{ |
| 441 |
struct Client *client_p = auth->client; |
| 442 |
|
| 443 |
dlinkDelete(&auth->dns_node, &auth_doing_dns_list); |
| 444 |
if (client_p->localClient->dns_query != NULL) |
| 445 |
{ |
| 446 |
delete_resolver_queries(client_p->localClient->dns_query); |
| 447 |
MyFree(client_p->localClient->dns_query); |
| 448 |
} |
| 449 |
auth->client->localClient->dns_query = NULL; |
| 450 |
sendheader(client_p, REPORT_FAIL_DNS); |
| 451 |
} |
| 452 |
|
| 453 |
ilog(L_INFO, "DNS/AUTH timeout %s", |
| 454 |
get_client_name(auth->client, SHOW_IP)); |
| 455 |
|
| 456 |
dlinkDelete(&auth->ident_node, &auth_doing_ident_list); |
| 457 |
release_auth_client(auth->client); |
| 458 |
MyFree(auth); |
| 459 |
} |
| 460 |
} |
| 461 |
} |
| 462 |
|
| 463 |
/* |
| 464 |
* auth_connect_callback() - deal with the result of comm_connect_tcp() |
| 465 |
* |
| 466 |
* If the connection failed, we simply close the auth fd and report |
| 467 |
* a failure. If the connection suceeded send the ident server a query |
| 468 |
* giving "theirport , ourport". The write is only attempted *once* so |
| 469 |
* it is deemed to be a fail if the entire write doesn't write all the |
| 470 |
* data given. This shouldnt be a problem since the socket should have |
| 471 |
* a write buffer far greater than this message to store it in should |
| 472 |
* problems arise. -avalon |
| 473 |
*/ |
| 474 |
static void |
| 475 |
auth_connect_callback(fde_t *fd, int error, void *data) |
| 476 |
{ |
| 477 |
struct AuthRequest *auth = data; |
| 478 |
struct irc_ssaddr us; |
| 479 |
struct irc_ssaddr them; |
| 480 |
char authbuf[32]; |
| 481 |
socklen_t ulen = sizeof(struct irc_ssaddr); |
| 482 |
socklen_t tlen = sizeof(struct irc_ssaddr); |
| 483 |
u_int16_t uport, tport; |
| 484 |
#ifdef IPV6 |
| 485 |
struct sockaddr_in6 *v6; |
| 486 |
#else |
| 487 |
struct sockaddr_in *v4; |
| 488 |
#endif |
| 489 |
|
| 490 |
if (error != COMM_OK) |
| 491 |
{ |
| 492 |
auth_error(auth); |
| 493 |
return; |
| 494 |
} |
| 495 |
|
| 496 |
if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *) &us, |
| 497 |
(socklen_t *) &ulen) || |
| 498 |
getpeername(auth->client->localClient->fd.fd, (struct sockaddr *) &them, |
| 499 |
(socklen_t *) &tlen)) |
| 500 |
{ |
| 501 |
ilog(L_INFO, "auth get{sock,peer}name error for %s", |
| 502 |
get_client_name(auth->client, SHOW_IP)); |
| 503 |
auth_error(auth); |
| 504 |
return; |
| 505 |
} |
| 506 |
|
| 507 |
#ifdef IPV6 |
| 508 |
v6 = (struct sockaddr_in6 *)&us; |
| 509 |
uport = ntohs(v6->sin6_port); |
| 510 |
v6 = (struct sockaddr_in6 *)&them; |
| 511 |
tport = ntohs(v6->sin6_port); |
| 512 |
remove_ipv6_mapping(&us); |
| 513 |
remove_ipv6_mapping(&them); |
| 514 |
#else |
| 515 |
v4 = (struct sockaddr_in *)&us; |
| 516 |
uport = ntohs(v4->sin_port); |
| 517 |
v4 = (struct sockaddr_in *)&them; |
| 518 |
tport = ntohs(v4->sin_port); |
| 519 |
us.ss_len = ulen; |
| 520 |
them.ss_len = tlen; |
| 521 |
#endif |
| 522 |
|
| 523 |
ircsprintf(authbuf, "%u , %u\r\n", tport, uport); |
| 524 |
|
| 525 |
if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1) |
| 526 |
{ |
| 527 |
auth_error(auth); |
| 528 |
return; |
| 529 |
} |
| 530 |
|
| 531 |
read_auth_reply(&auth->fd, auth); |
| 532 |
} |
| 533 |
|
| 534 |
/* |
| 535 |
* read_auth_reply - read the reply (if any) from the ident server |
| 536 |
* we connected to. |
| 537 |
* We only give it one shot, if the reply isn't good the first time |
| 538 |
* fail the authentication entirely. --Bleep |
| 539 |
*/ |
| 540 |
#define AUTH_BUFSIZ 128 |
| 541 |
|
| 542 |
static void |
| 543 |
read_auth_reply(fde_t *fd, void *data) |
| 544 |
{ |
| 545 |
struct AuthRequest *auth = data; |
| 546 |
char *s = NULL; |
| 547 |
char *t = NULL; |
| 548 |
int len; |
| 549 |
int count; |
| 550 |
char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */ |
| 551 |
|
| 552 |
/* Why? |
| 553 |
* Well, recv() on many POSIX systems is a per-packet operation, |
| 554 |
* and we do not necessarily want this, because on lowspec machines, |
| 555 |
* the ident response may come back fragmented, thus resulting in an |
| 556 |
* invalid ident response, even if the ident response was really OK. |
| 557 |
* |
| 558 |
* So PLEASE do not change this code to recv without being aware of the |
| 559 |
* consequences. |
| 560 |
* |
| 561 |
* --nenolod |
| 562 |
*/ |
| 563 |
#ifndef _WIN32 |
| 564 |
len = read(fd->fd, buf, AUTH_BUFSIZ); |
| 565 |
#else |
| 566 |
len = recv(fd->fd, buf, AUTH_BUFSIZ, 0); |
| 567 |
#endif |
| 568 |
|
| 569 |
if (len < 0) |
| 570 |
{ |
| 571 |
#ifdef _WIN32 |
| 572 |
errno = WSAGetLastError(); |
| 573 |
#endif |
| 574 |
if (ignoreErrno(errno)) |
| 575 |
comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0); |
| 576 |
else |
| 577 |
auth_error(auth); |
| 578 |
return; |
| 579 |
} |
| 580 |
|
| 581 |
if (len > 0) |
| 582 |
{ |
| 583 |
buf[len] = '\0'; |
| 584 |
|
| 585 |
if ((s = GetValidIdent(buf))) |
| 586 |
{ |
| 587 |
t = auth->client->username; |
| 588 |
|
| 589 |
while (*s == '~' || *s == '^') |
| 590 |
s++; |
| 591 |
|
| 592 |
for (count = USERLEN; *s && count; s++) |
| 593 |
{ |
| 594 |
if (*s == '@') |
| 595 |
break; |
| 596 |
if (!IsSpace(*s) && *s != ':' && *s != '[') |
| 597 |
{ |
| 598 |
*t++ = *s; |
| 599 |
count--; |
| 600 |
} |
| 601 |
} |
| 602 |
|
| 603 |
*t = '\0'; |
| 604 |
} |
| 605 |
} |
| 606 |
|
| 607 |
fd_close(fd); |
| 608 |
|
| 609 |
dlinkDelete(&auth->ident_node, &auth_doing_ident_list); |
| 610 |
ClearAuth(auth); |
| 611 |
|
| 612 |
if (s == NULL) |
| 613 |
{ |
| 614 |
sendheader(auth->client, REPORT_FAIL_ID); |
| 615 |
++ServerStats.is_abad; |
| 616 |
} |
| 617 |
else |
| 618 |
{ |
| 619 |
sendheader(auth->client, REPORT_FIN_ID); |
| 620 |
++ServerStats.is_asuc; |
| 621 |
SetGotId(auth->client); |
| 622 |
} |
| 623 |
|
| 624 |
if (!IsDNSPending(auth) && !IsCrit(auth)) |
| 625 |
{ |
| 626 |
release_auth_client(auth->client); |
| 627 |
MyFree(auth); |
| 628 |
} |
| 629 |
} |
| 630 |
|
| 631 |
/* |
| 632 |
* delete_auth() |
| 633 |
*/ |
| 634 |
void |
| 635 |
delete_auth(struct Client *target_p) |
| 636 |
{ |
| 637 |
dlink_node *ptr; |
| 638 |
dlink_node *next_ptr; |
| 639 |
struct AuthRequest *auth; |
| 640 |
|
| 641 |
if (!IsUnknown(target_p)) |
| 642 |
return; |
| 643 |
|
| 644 |
if (target_p->localClient->dns_query != NULL) |
| 645 |
DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_dns_list.head) |
| 646 |
{ |
| 647 |
auth = ptr->data; |
| 648 |
|
| 649 |
if (auth->client == target_p) |
| 650 |
{ |
| 651 |
delete_resolver_queries(target_p->localClient->dns_query); |
| 652 |
MyFree(target_p->localClient->dns_query); |
| 653 |
target_p->localClient->dns_query = NULL; |
| 654 |
|
| 655 |
dlinkDelete(&auth->dns_node, &auth_doing_dns_list); |
| 656 |
|
| 657 |
if (!IsDoingAuth(auth)) |
| 658 |
{ |
| 659 |
MyFree(auth); |
| 660 |
return; |
| 661 |
} |
| 662 |
} |
| 663 |
} |
| 664 |
|
| 665 |
DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head) |
| 666 |
{ |
| 667 |
auth = ptr->data; |
| 668 |
|
| 669 |
if (auth->client == target_p) |
| 670 |
{ |
| 671 |
fd_close(&auth->fd); |
| 672 |
|
| 673 |
dlinkDelete(&auth->ident_node, &auth_doing_ident_list); |
| 674 |
MyFree(auth); |
| 675 |
} |
| 676 |
} |
| 677 |
} |
