1 |
/* |
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* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). |
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* s_auth.c: Functions for querying a users ident. |
4 |
* |
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* Copyright (C) 2002 by the past and present ircd coders, and others. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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* USA |
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* |
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* $Id$ |
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*/ |
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|
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/* |
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* Changes: |
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* July 6, 1999 - Rewrote most of the code here. When a client connects |
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* to the server and passes initial socket validation checks, it |
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* is owned by this module (auth) which returns it to the rest of the |
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* server when dns and auth queries are finished. Until the client is |
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* released, the server does not know it exists and does not process |
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* any messages from it. |
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* --Bleep Thomas Helvey <tomh@inxpress.net> |
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*/ |
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#include "stdinc.h" |
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#include "tools.h" |
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#include "list.h" |
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#include "s_auth.h" |
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#include "s_conf.h" |
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#include "client.h" |
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#include "common.h" |
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#include "event.h" |
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#include "fdlist.h" /* fdlist_add */ |
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#include "hook.h" |
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#include "irc_string.h" |
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#include "sprintf_irc.h" |
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#include "ircd.h" |
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#include "numeric.h" |
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#include "packet.h" |
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#include "irc_res.h" |
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#include "s_bsd.h" |
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#include "s_log.h" |
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#include "s_stats.h" |
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#include "send.h" |
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#include "memory.h" |
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|
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static const char *HeaderMessages[] = { |
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":%s NOTICE AUTH :*** Looking up your hostname...", |
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":%s NOTICE AUTH :*** Found your hostname", |
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":%s NOTICE AUTH :*** Couldn't look up your hostname", |
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":%s NOTICE AUTH :*** Checking Ident", |
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":%s NOTICE AUTH :*** Got Ident response", |
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":%s NOTICE AUTH :*** No Ident response", |
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":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.", |
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":%s NOTICE AUTH :*** Your hostname is too long, ignoring hostname" |
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}; |
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|
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enum { |
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REPORT_DO_DNS, |
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REPORT_FIN_DNS, |
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REPORT_FAIL_DNS, |
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REPORT_DO_ID, |
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REPORT_FIN_ID, |
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REPORT_FAIL_ID, |
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REPORT_IP_MISMATCH, |
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REPORT_HOST_TOOLONG |
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}; |
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|
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#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name) |
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|
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/* |
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* Ok, the original was confusing. |
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* Now there are two lists, an auth request can be on both at the same time |
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* or only on one or the other. |
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* - Dianora |
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*/ |
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static dlink_list auth_doing_dns_list = { NULL, NULL, 0 }; |
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static dlink_list auth_doing_ident_list = { NULL, NULL, 0 }; |
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|
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static EVH timeout_auth_queries_event; |
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|
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static PF read_auth_reply; |
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static CNCB auth_connect_callback; |
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static CBFUNC start_auth; |
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|
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struct Callback *auth_cb = NULL; |
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|
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/* init_auth() |
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* |
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* Initialise the auth code |
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*/ |
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void |
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init_auth(void) |
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{ |
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auth_cb = register_callback("start_auth", start_auth); |
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eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1); |
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} |
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|
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/* |
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* make_auth_request - allocate a new auth request |
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*/ |
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static struct AuthRequest * |
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make_auth_request(struct Client *client) |
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{ |
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struct AuthRequest *request = MyMalloc(sizeof(struct AuthRequest)); |
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|
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request->client = client; |
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request->timeout = CurrentTime + CONNECTTIMEOUT; |
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|
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return (request); |
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} |
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|
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/* |
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* release_auth_client - release auth client from auth system |
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* this adds the client into the local client lists so it can be read by |
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* the main io processing loop |
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*/ |
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void |
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release_auth_client(struct Client *client) |
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{ |
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/* |
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* When a client has auth'ed, we want to start reading what it sends |
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* us. This is what read_packet() does. |
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* -- adrian |
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*/ |
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client->localClient->allow_read = MAX_FLOOD; |
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comm_setflush(&client->localClient->fd, 1000, flood_recalc, client); |
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if ((client->node.prev != NULL) || (client->node.next != NULL)) |
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{ |
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sendto_realops_flags(UMODE_ALL, L_OPER, |
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"already linked %s at %s:%d", client->name, |
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__FILE__, __LINE__); |
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ilog(L_ERROR, "already linked %s at %s:%d", client->name, |
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__FILE__, __LINE__); |
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assert(0==5); |
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} |
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else |
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dlinkAdd(client, &client->node, &global_client_list); |
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read_packet(&client->localClient->fd, client); |
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} |
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|
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/* |
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* auth_dns_callback - called when resolver query finishes |
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* if the query resulted in a successful search, hp will contain |
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* a non-null pointer, otherwise hp will be null. |
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* set the client on it's way to a connection completion, regardless |
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* of success of failure |
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*/ |
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static void |
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auth_dns_callback(void *vptr, struct DNSReply *reply) |
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{ |
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struct AuthRequest *auth = (struct AuthRequest *)vptr; |
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|
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dlinkDelete(&auth->dns_node, &auth_doing_dns_list); |
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ClearDNSPending(auth); |
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|
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if (reply != NULL) |
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{ |
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struct sockaddr_in *v4, *v4dns; |
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#ifdef IPV6 |
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struct sockaddr_in6 *v6, *v6dns; |
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#endif |
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int good = 1; |
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|
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#ifdef IPV6 |
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if (auth->client->localClient->ip.ss.ss_family == AF_INET6) |
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{ |
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v6 = (struct sockaddr_in6 *)&auth->client->localClient->ip; |
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v6dns = (struct sockaddr_in6 *)&reply->addr; |
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if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0) |
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{ |
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sendheader(auth->client, REPORT_IP_MISMATCH); |
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good = 0; |
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} |
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} |
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else |
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#endif |
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{ |
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v4 = (struct sockaddr_in *)&auth->client->localClient->ip; |
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v4dns = (struct sockaddr_in *)&reply->addr; |
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if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr) |
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{ |
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sendheader(auth->client, REPORT_IP_MISMATCH); |
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good = 0; |
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} |
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} |
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if (good && strlen(reply->h_name) <= HOSTLEN) |
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{ |
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strlcpy(auth->client->host, reply->h_name, |
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sizeof(auth->client->host)); |
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sendheader(auth->client, REPORT_FIN_DNS); |
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} |
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else if (strlen(reply->h_name) > HOSTLEN) |
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sendheader(auth->client, REPORT_HOST_TOOLONG); |
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} |
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else |
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sendheader(auth->client, REPORT_FAIL_DNS); |
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|
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MyFree(auth->client->localClient->dns_query); |
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auth->client->localClient->dns_query = NULL; |
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|
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if (!IsDoingAuth(auth)) |
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{ |
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struct Client *client_p = auth->client; |
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MyFree(auth); |
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release_auth_client(client_p); |
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} |
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} |
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|
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/* |
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* authsenderr - handle auth send errors |
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*/ |
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static void |
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auth_error(struct AuthRequest *auth) |
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{ |
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++ServerStats->is_abad; |
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|
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fd_close(&auth->fd); |
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|
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dlinkDelete(&auth->ident_node, &auth_doing_ident_list); |
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ClearAuth(auth); |
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|
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sendheader(auth->client, REPORT_FAIL_ID); |
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|
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if (!IsDNSPending(auth) && !IsCrit(auth)) |
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{ |
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release_auth_client(auth->client); |
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MyFree(auth); |
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} |
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} |
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|
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/* |
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* start_auth_query - Flag the client to show that an attempt to |
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* contact the ident server on |
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* the client's host. The connect and subsequently the socket are all put |
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* into 'non-blocking' mode. Should the connect or any later phase of the |
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* identifing process fail, it is aborted and the user is given a username |
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* of "unknown". |
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*/ |
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static int |
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start_auth_query(struct AuthRequest *auth) |
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{ |
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struct irc_ssaddr localaddr; |
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socklen_t locallen = sizeof(struct irc_ssaddr); |
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#ifdef IPV6 |
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struct sockaddr_in6 *v6; |
257 |
#else |
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struct sockaddr_in *v4; |
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#endif |
260 |
|
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/* open a socket of the same type as the client socket */ |
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if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family, |
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SOCK_STREAM, 0, "ident") == -1) |
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{ |
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report_error(L_ALL, "creating auth stream socket %s:%s", |
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get_client_name(auth->client, SHOW_IP), errno); |
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ilog(L_ERROR, "Unable to create auth socket for %s", |
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get_client_name(auth->client, SHOW_IP)); |
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++ServerStats->is_abad; |
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return 0; |
271 |
} |
272 |
|
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sendheader(auth->client, REPORT_DO_ID); |
274 |
|
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/* |
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* get the local address of the client and bind to that to |
277 |
* make the auth request. This used to be done only for |
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* ifdef VIRTUAL_HOST, but needs to be done for all clients |
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* since the ident request must originate from that same address-- |
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* and machines with multiple IP addresses are common now |
281 |
*/ |
282 |
memset(&localaddr, 0, locallen); |
283 |
getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr, |
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&locallen); |
285 |
|
286 |
#ifdef IPV6 |
287 |
remove_ipv6_mapping(&localaddr); |
288 |
v6 = (struct sockaddr_in6 *)&localaddr; |
289 |
v6->sin6_port = htons(0); |
290 |
#else |
291 |
localaddr.ss_len = locallen; |
292 |
v4 = (struct sockaddr_in *)&localaddr; |
293 |
v4->sin_port = htons(0); |
294 |
#endif |
295 |
localaddr.ss_port = htons(0); |
296 |
|
297 |
SetDoingAuth(auth); |
298 |
dlinkAdd(auth, &auth->ident_node, &auth_doing_ident_list); |
299 |
|
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comm_connect_tcp(&auth->fd, auth->client->sockhost, 113, |
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(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback, |
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auth, auth->client->localClient->ip.ss.ss_family, |
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GlobalSetOptions.ident_timeout); |
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return 1; /* We suceed here for now */ |
305 |
} |
306 |
|
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/* |
308 |
* GetValidIdent - parse ident query reply from identd server |
309 |
* |
310 |
* Inputs - pointer to ident buf |
311 |
* Output - NULL if no valid ident found, otherwise pointer to name |
312 |
* Side effects - |
313 |
*/ |
314 |
/* |
315 |
* A few questions have been asked about this mess, obviously |
316 |
* it should have been commented better the first time. |
317 |
* The original idea was to remove all references to libc from ircd-hybrid. |
318 |
* Instead of having to write a replacement for sscanf(), I did a |
319 |
* rather gruseome parser here so we could remove this function call. |
320 |
* Note, that I had also removed a few floating point printfs as well (though |
321 |
* now we are still stuck with a few...) |
322 |
* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib |
323 |
* it would have been nice to remove some unneeded code. |
324 |
* Oh well. If we don't remove libc stuff totally, then it would be |
325 |
* far cleaner to use sscanf() |
326 |
* |
327 |
* - Dianora |
328 |
*/ |
329 |
static char * |
330 |
GetValidIdent(char *buf) |
331 |
{ |
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int remp = 0; |
333 |
int locp = 0; |
334 |
char* colon1Ptr; |
335 |
char* colon2Ptr; |
336 |
char* colon3Ptr; |
337 |
char* commaPtr; |
338 |
char* remotePortString; |
339 |
|
340 |
/* All this to get rid of a sscanf() fun. */ |
341 |
remotePortString = buf; |
342 |
|
343 |
if ((colon1Ptr = strchr(remotePortString,':')) == NULL) |
344 |
return 0; |
345 |
*colon1Ptr = '\0'; |
346 |
colon1Ptr++; |
347 |
|
348 |
if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL) |
349 |
return 0; |
350 |
*colon2Ptr = '\0'; |
351 |
colon2Ptr++; |
352 |
|
353 |
if ((commaPtr = strchr(remotePortString, ',')) == NULL) |
354 |
return 0; |
355 |
*commaPtr = '\0'; |
356 |
commaPtr++; |
357 |
|
358 |
if ((remp = atoi(remotePortString)) == 0) |
359 |
return 0; |
360 |
|
361 |
if ((locp = atoi(commaPtr)) == 0) |
362 |
return 0; |
363 |
|
364 |
/* look for USERID bordered by first pair of colons */ |
365 |
if (strstr(colon1Ptr, "USERID") == NULL) |
366 |
return 0; |
367 |
|
368 |
if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL) |
369 |
return 0; |
370 |
*colon3Ptr = '\0'; |
371 |
colon3Ptr++; |
372 |
return (colon3Ptr); |
373 |
} |
374 |
|
375 |
/* |
376 |
* start_auth |
377 |
* |
378 |
* inputs - pointer to client to auth |
379 |
* output - NONE |
380 |
* side effects - starts auth (identd) and dns queries for a client |
381 |
*/ |
382 |
static void * |
383 |
start_auth(va_list args) |
384 |
{ |
385 |
struct Client *client = va_arg(args, struct Client *); |
386 |
struct AuthRequest *auth = NULL; |
387 |
|
388 |
assert(client != NULL); |
389 |
|
390 |
auth = make_auth_request(client); |
391 |
SetCrit(auth); |
392 |
|
393 |
client->localClient->dns_query = MyMalloc(sizeof(struct DNSQuery)); |
394 |
client->localClient->dns_query->ptr = auth; |
395 |
client->localClient->dns_query->callback = auth_dns_callback; |
396 |
|
397 |
sendheader(client, REPORT_DO_DNS); |
398 |
|
399 |
if (ConfigFileEntry.disable_auth == 0) |
400 |
start_auth_query(auth); |
401 |
|
402 |
/* auth order changed, before gethost_byaddr can immediately call |
403 |
* dns callback under win32 when the lookup cannot be started. |
404 |
* And that would do MyFree(auth) etc -adx */ |
405 |
SetDNSPending(auth); |
406 |
dlinkAdd(auth, &auth->dns_node, &auth_doing_dns_list); |
407 |
ClearCrit(auth); |
408 |
gethost_byaddr(&client->localClient->ip, client->localClient->dns_query); |
409 |
|
410 |
return NULL; |
411 |
} |
412 |
|
413 |
/* |
414 |
* timeout_auth_queries - timeout resolver and identd requests |
415 |
* allow clients through if requests failed |
416 |
*/ |
417 |
static void |
418 |
timeout_auth_queries_event(void *notused) |
419 |
{ |
420 |
dlink_node *ptr; |
421 |
dlink_node *next_ptr; |
422 |
struct AuthRequest* auth; |
423 |
|
424 |
DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head) |
425 |
{ |
426 |
auth = ptr->data; |
427 |
|
428 |
if (auth->timeout <= CurrentTime) |
429 |
{ |
430 |
fd_close(&auth->fd); |
431 |
|
432 |
++ServerStats->is_abad; |
433 |
sendheader(auth->client, REPORT_FAIL_ID); |
434 |
|
435 |
if (IsDNSPending(auth)) |
436 |
{ |
437 |
struct Client *client_p = auth->client; |
438 |
|
439 |
dlinkDelete(&auth->dns_node, &auth_doing_dns_list); |
440 |
if (client_p->localClient->dns_query != NULL) |
441 |
{ |
442 |
delete_resolver_queries(client_p->localClient->dns_query); |
443 |
MyFree(client_p->localClient->dns_query); |
444 |
} |
445 |
auth->client->localClient->dns_query = NULL; |
446 |
sendheader(client_p, REPORT_FAIL_DNS); |
447 |
} |
448 |
|
449 |
ilog(L_INFO, "DNS/AUTH timeout %s", |
450 |
get_client_name(auth->client, SHOW_IP)); |
451 |
|
452 |
dlinkDelete(&auth->ident_node, &auth_doing_ident_list); |
453 |
release_auth_client(auth->client); |
454 |
MyFree(auth); |
455 |
} |
456 |
} |
457 |
} |
458 |
|
459 |
/* |
460 |
* auth_connect_callback() - deal with the result of comm_connect_tcp() |
461 |
* |
462 |
* If the connection failed, we simply close the auth fd and report |
463 |
* a failure. If the connection suceeded send the ident server a query |
464 |
* giving "theirport , ourport". The write is only attempted *once* so |
465 |
* it is deemed to be a fail if the entire write doesn't write all the |
466 |
* data given. This shouldnt be a problem since the socket should have |
467 |
* a write buffer far greater than this message to store it in should |
468 |
* problems arise. -avalon |
469 |
*/ |
470 |
static void |
471 |
auth_connect_callback(fde_t *fd, int error, void *data) |
472 |
{ |
473 |
struct AuthRequest *auth = data; |
474 |
struct irc_ssaddr us; |
475 |
struct irc_ssaddr them; |
476 |
char authbuf[32]; |
477 |
socklen_t ulen = sizeof(struct irc_ssaddr); |
478 |
socklen_t tlen = sizeof(struct irc_ssaddr); |
479 |
u_int16_t uport, tport; |
480 |
#ifdef IPV6 |
481 |
struct sockaddr_in6 *v6; |
482 |
#else |
483 |
struct sockaddr_in *v4; |
484 |
#endif |
485 |
|
486 |
if (error != COMM_OK) |
487 |
{ |
488 |
auth_error(auth); |
489 |
return; |
490 |
} |
491 |
|
492 |
if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *) &us, |
493 |
(socklen_t *) &ulen) || |
494 |
getpeername(auth->client->localClient->fd.fd, (struct sockaddr *) &them, |
495 |
(socklen_t *) &tlen)) |
496 |
{ |
497 |
ilog(L_INFO, "auth get{sock,peer}name error for %s", |
498 |
get_client_name(auth->client, SHOW_IP)); |
499 |
auth_error(auth); |
500 |
return; |
501 |
} |
502 |
|
503 |
#ifdef IPV6 |
504 |
v6 = (struct sockaddr_in6 *)&us; |
505 |
uport = ntohs(v6->sin6_port); |
506 |
v6 = (struct sockaddr_in6 *)&them; |
507 |
tport = ntohs(v6->sin6_port); |
508 |
remove_ipv6_mapping(&us); |
509 |
remove_ipv6_mapping(&them); |
510 |
#else |
511 |
v4 = (struct sockaddr_in *)&us; |
512 |
uport = ntohs(v4->sin_port); |
513 |
v4 = (struct sockaddr_in *)&them; |
514 |
tport = ntohs(v4->sin_port); |
515 |
us.ss_len = ulen; |
516 |
them.ss_len = tlen; |
517 |
#endif |
518 |
|
519 |
ircsprintf(authbuf, "%u , %u\r\n", tport, uport); |
520 |
|
521 |
if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1) |
522 |
{ |
523 |
auth_error(auth); |
524 |
return; |
525 |
} |
526 |
read_auth_reply(&auth->fd, auth); |
527 |
} |
528 |
|
529 |
/* |
530 |
* read_auth_reply - read the reply (if any) from the ident server |
531 |
* we connected to. |
532 |
* We only give it one shot, if the reply isn't good the first time |
533 |
* fail the authentication entirely. --Bleep |
534 |
*/ |
535 |
#define AUTH_BUFSIZ 128 |
536 |
|
537 |
static void |
538 |
read_auth_reply(fde_t *fd, void *data) |
539 |
{ |
540 |
struct AuthRequest *auth = data; |
541 |
char *s = NULL; |
542 |
char *t = NULL; |
543 |
int len; |
544 |
int count; |
545 |
char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */ |
546 |
|
547 |
/* Why? |
548 |
* Well, recv() on many POSIX systems is a per-packet operation, |
549 |
* and we do not necessarily want this, because on lowspec machines, |
550 |
* the ident response may come back fragmented, thus resulting in an |
551 |
* invalid ident response, even if the ident response was really OK. |
552 |
* |
553 |
* So PLEASE do not change this code to recv without being aware of the |
554 |
* consequences. |
555 |
* |
556 |
* --nenolod |
557 |
*/ |
558 |
#ifndef _WIN32 |
559 |
len = read(fd->fd, buf, AUTH_BUFSIZ); |
560 |
#else |
561 |
len = recv(fd->fd, buf, AUTH_BUFSIZ, 0); |
562 |
#endif |
563 |
|
564 |
if (len < 0) |
565 |
{ |
566 |
#ifdef _WIN32 |
567 |
errno = WSAGetLastError(); |
568 |
#endif |
569 |
if (ignoreErrno(errno)) |
570 |
comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0); |
571 |
else |
572 |
auth_error(auth); |
573 |
return; |
574 |
} |
575 |
|
576 |
if (len > 0) |
577 |
{ |
578 |
buf[len] = '\0'; |
579 |
|
580 |
if ((s = GetValidIdent(buf))) |
581 |
{ |
582 |
t = auth->client->username; |
583 |
|
584 |
while (*s == '~' || *s == '^') |
585 |
s++; |
586 |
|
587 |
for (count = USERLEN; *s && count; s++) |
588 |
{ |
589 |
if (*s == '@') |
590 |
break; |
591 |
if (!IsSpace(*s) && *s != ':' && *s != '[') |
592 |
{ |
593 |
*t++ = *s; |
594 |
count--; |
595 |
} |
596 |
} |
597 |
|
598 |
*t = '\0'; |
599 |
} |
600 |
} |
601 |
|
602 |
fd_close(fd); |
603 |
|
604 |
dlinkDelete(&auth->ident_node, &auth_doing_ident_list); |
605 |
ClearAuth(auth); |
606 |
|
607 |
if (s == NULL) |
608 |
{ |
609 |
sendheader(auth->client, REPORT_FAIL_ID); |
610 |
++ServerStats->is_abad; |
611 |
} |
612 |
else |
613 |
{ |
614 |
sendheader(auth->client, REPORT_FIN_ID); |
615 |
++ServerStats->is_asuc; |
616 |
SetGotId(auth->client); |
617 |
} |
618 |
|
619 |
if (!IsDNSPending(auth) && !IsCrit(auth)) |
620 |
{ |
621 |
release_auth_client(auth->client); |
622 |
MyFree(auth); |
623 |
} |
624 |
} |
625 |
|
626 |
/* |
627 |
* delete_auth() |
628 |
*/ |
629 |
void |
630 |
delete_auth(struct Client *target_p) |
631 |
{ |
632 |
dlink_node *ptr; |
633 |
dlink_node *next_ptr; |
634 |
struct AuthRequest *auth; |
635 |
|
636 |
if (!IsUnknown(target_p)) |
637 |
return; |
638 |
|
639 |
if (target_p->localClient->dns_query != NULL) |
640 |
DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_dns_list.head) |
641 |
{ |
642 |
auth = ptr->data; |
643 |
|
644 |
if (auth->client == target_p) |
645 |
{ |
646 |
delete_resolver_queries(target_p->localClient->dns_query); |
647 |
|
648 |
dlinkDelete(&auth->dns_node, &auth_doing_dns_list); |
649 |
if (!IsDoingAuth(auth)) |
650 |
{ |
651 |
MyFree(auth); |
652 |
return; |
653 |
} |
654 |
} |
655 |
} |
656 |
|
657 |
DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head) |
658 |
{ |
659 |
auth = ptr->data; |
660 |
|
661 |
if (auth->client == target_p) |
662 |
{ |
663 |
fd_close(&auth->fd); |
664 |
|
665 |
dlinkDelete(&auth->ident_node, &auth_doing_ident_list); |
666 |
MyFree(auth); |
667 |
} |
668 |
} |
669 |
} |