trunk/src/auth.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  s_auth.c: Functions for querying a users ident.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id$
 */

/*
 * Changes:
 *   July 6, 1999 - Rewrote most of the code here. When a client connects
 *     to the server and passes initial socket validation checks, it
 *     is owned by this module (auth) which returns it to the rest of the
 *     server when dns and auth queries are finished. Until the client is
 *     released, the server does not know it exists and does not process
 *     any messages from it.
 *     --Bleep  Thomas Helvey <tomh@inxpress.net>
 */
#include "stdinc.h"
#include "tools.h"
#include "list.h"
#include "s_auth.h"
#include "s_conf.h"
#include "balloc.h"
#include "client.h"
#include "common.h"
#include "event.h"
#include "fdlist.h"              /* fdlist_add */
#include "hook.h"
#include "irc_string.h"
#include "sprintf_irc.h"
#include "ircd.h"
#include "numeric.h"
#include "packet.h"
#include "irc_res.h"
#include "s_bsd.h"
#include "s_log.h"
#include "send.h"
#include "memory.h"

static const char *HeaderMessages[] = {
  ":%s NOTICE AUTH :*** Looking up your hostname...",
  ":%s NOTICE AUTH :*** Found your hostname",
  ":%s NOTICE AUTH :*** Couldn't look up your hostname",
  ":%s NOTICE AUTH :*** Checking Ident",
  ":%s NOTICE AUTH :*** Got Ident response",
  ":%s NOTICE AUTH :*** No Ident response",
  ":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.",
  ":%s NOTICE AUTH :*** Your hostname is too long, ignoring hostname"
};

enum {
  REPORT_DO_DNS,
  REPORT_FIN_DNS,
  REPORT_FAIL_DNS,
  REPORT_DO_ID,
  REPORT_FIN_ID,
  REPORT_FAIL_ID,
  REPORT_IP_MISMATCH,
  REPORT_HOST_TOOLONG
};

#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name)

static BlockHeap *auth_heap = NULL;
static dlink_list auth_doing_list = { NULL, NULL, 0 };

static EVH timeout_auth_queries_event;

static PF read_auth_reply;
static CNCB auth_connect_callback;
static CBFUNC start_auth;

struct Callback *auth_cb = NULL;

/* init_auth()
 *
 * Initialise the auth code
 */
void
init_auth(void)
{
  auth_heap = BlockHeapCreate("auth", sizeof(struct AuthRequest), AUTH_HEAP_SIZE);
  auth_cb = register_callback("start_auth", start_auth);
  eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
}

/*
 * make_auth_request - allocate a new auth request
 */
static struct AuthRequest *
make_auth_request(struct Client *client)
{
  struct AuthRequest *request = BlockHeapAlloc(auth_heap);

  client->localClient->auth = request;
  request->client           = client;
  request->timeout          = CurrentTime + CONNECTTIMEOUT;

  return request;
}

/*
 * release_auth_client - release auth client from auth system
 * this adds the client into the local client lists so it can be read by
 * the main io processing loop
 */
void
release_auth_client(struct AuthRequest *auth)
{
  struct Client *client = auth->client;

  if (IsDoingAuth(auth) || IsDNSPending(auth))
    return;

  client->localClient->auth = NULL;
  dlinkDelete(&auth->node, &auth_doing_list);
  BlockHeapFree(auth_heap, auth);

  /*
   * When a client has auth'ed, we want to start reading what it sends
   * us. This is what read_packet() does.
   *     -- adrian
   */
  client->localClient->allow_read = MAX_FLOOD;
  comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);

  dlinkAdd(client, &client->node, &global_client_list);

  client->since  = client->lasttime = client->firsttime = CurrentTime;
  client->flags |= FLAGS_FINISHED_AUTH;

  read_packet(&client->localClient->fd, client);
}
 
/*
 * auth_dns_callback - called when resolver query finishes
 * if the query resulted in a successful search, name will contain
 * a non-NULL pointer, otherwise name will be NULL.
 * set the client on it's way to a connection completion, regardless
 * of success of failure
 */
static void
auth_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name)
{
  struct AuthRequest *auth = vptr;

  ClearDNSPending(auth);

  if (name != NULL)
  {
    const struct sockaddr_in *v4, *v4dns;
#ifdef IPV6
    const struct sockaddr_in6 *v6, *v6dns;
#endif
    int good = 1;

#ifdef IPV6
    if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
    {
      v6 = (const struct sockaddr_in6 *)&auth->client->localClient->ip;
      v6dns = (const struct sockaddr_in6 *)addr;
      if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
      {
        sendheader(auth->client, REPORT_IP_MISMATCH);
        good = 0;
      }
    }
    else
#endif
    {
      v4 = (const struct sockaddr_in *)&auth->client->localClient->ip;
      v4dns = (const struct sockaddr_in *)addr;
      if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
      {
        sendheader(auth->client, REPORT_IP_MISMATCH);
        good = 0;
      }
    }
    if (good && strlen(name) <= HOSTLEN)
    {
      strlcpy(auth->client->host, name,
              sizeof(auth->client->host));
      sendheader(auth->client, REPORT_FIN_DNS);
    }
    else if (strlen(name) > HOSTLEN)
      sendheader(auth->client, REPORT_HOST_TOOLONG);
  }
  else
    sendheader(auth->client, REPORT_FAIL_DNS);

  release_auth_client(auth);
}

/*
 * authsenderr - handle auth send errors
 */
static void
auth_error(struct AuthRequest *auth)
{
  ++ServerStats.is_abad;

  fd_close(&auth->fd);

  ClearAuth(auth);

  sendheader(auth->client, REPORT_FAIL_ID);

  release_auth_client(auth);
}

/*
 * start_auth_query - Flag the client to show that an attempt to 
 * contact the ident server on
 * the client's host.  The connect and subsequently the socket are all put
 * into 'non-blocking' mode.  Should the connect or any later phase of the
 * identifing process fail, it is aborted and the user is given a username
 * of "unknown".
 */
static int
start_auth_query(struct AuthRequest *auth)
{
  struct irc_ssaddr localaddr;
  socklen_t locallen = sizeof(struct irc_ssaddr);
#ifdef IPV6
  struct sockaddr_in6 *v6;
#else
  struct sockaddr_in *v4;
#endif

  /* open a socket of the same type as the client socket */
  if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
                SOCK_STREAM, 0, "ident") == -1)
  {
    report_error(L_ALL, "creating auth stream socket %s:%s", 
        get_client_name(auth->client, SHOW_IP), errno);
    ilog(L_ERROR, "Unable to create auth socket for %s",
        get_client_name(auth->client, SHOW_IP));
    ++ServerStats.is_abad;
    return 0;
  }

  sendheader(auth->client, REPORT_DO_ID);

  /* 
   * get the local address of the client and bind to that to
   * make the auth request.  This used to be done only for
   * ifdef VIRTUAL_HOST, but needs to be done for all clients
   * since the ident request must originate from that same address--
   * and machines with multiple IP addresses are common now
   */
  memset(&localaddr, 0, locallen);
  getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
      &locallen);

#ifdef IPV6
  remove_ipv6_mapping(&localaddr);
  v6 = (struct sockaddr_in6 *)&localaddr;
  v6->sin6_port = htons(0);
#else
  localaddr.ss_len = locallen;
  v4 = (struct sockaddr_in *)&localaddr;
  v4->sin_port = htons(0);
#endif
  localaddr.ss_port = htons(0);

  comm_connect_tcp(&auth->fd, auth->client->sockhost, 113, 
      (struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback, 
      auth, auth->client->localClient->ip.ss.ss_family, 
      GlobalSetOptions.ident_timeout);
  return 1; /* We suceed here for now */
}

/*
 * GetValidIdent - parse ident query reply from identd server
 * 
 * Inputs        - pointer to ident buf
 * Output        - NULL if no valid ident found, otherwise pointer to name
 * Side effects  -
 */
/*
 * A few questions have been asked about this mess, obviously
 * it should have been commented better the first time.
 * The original idea was to remove all references to libc from ircd-hybrid.
 * Instead of having to write a replacement for sscanf(), I did a
 * rather gruseome parser here so we could remove this function call.
 * Note, that I had also removed a few floating point printfs as well (though
 * now we are still stuck with a few...)
 * Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
 * it would have been nice to remove some unneeded code.
 * Oh well. If we don't remove libc stuff totally, then it would be
 * far cleaner to use sscanf()
 *
 * - Dianora
 */
static char *
GetValidIdent(char *buf)
{
  int   remp = 0;
  int   locp = 0;
  char* colon1Ptr;
  char* colon2Ptr;
  char* colon3Ptr;
  char* commaPtr;
  char* remotePortString;

  /* All this to get rid of a sscanf() fun. */
  remotePortString = buf;
  
  if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
    return 0;
  *colon1Ptr = '\0';
  colon1Ptr++;

  if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
    return 0;
  *colon2Ptr = '\0';
  colon2Ptr++;
  
  if ((commaPtr = strchr(remotePortString, ',')) == NULL)
    return 0;
  *commaPtr = '\0';
  commaPtr++;

  if ((remp = atoi(remotePortString)) == 0)
    return 0;
              
  if ((locp = atoi(commaPtr)) == 0)
    return 0;

  /* look for USERID bordered by first pair of colons */
  if (strstr(colon1Ptr, "USERID") == NULL)
    return 0;

  if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
    return 0;
  *colon3Ptr = '\0';
  colon3Ptr++;
  return (colon3Ptr);
}

/*
 * start_auth 
 *
 * inputs       - pointer to client to auth
 * output       - NONE
 * side effects - starts auth (identd) and dns queries for a client
 */
static void *
start_auth(va_list args)
{
  struct Client *client = va_arg(args, struct Client *);
  struct AuthRequest *auth = NULL;

  assert(client != NULL);

  auth = make_auth_request(client);

  sendheader(client, REPORT_DO_DNS);

  SetDNSPending(auth);

  if (ConfigFileEntry.disable_auth == 0)
  {
    SetDoingAuth(auth);
    start_auth_query(auth);
  }

  dlinkAdd(auth, &auth->node, &auth_doing_list);

  gethost_byaddr(auth_dns_callback, auth, &client->localClient->ip);

  return NULL;
}

/*
 * timeout_auth_queries - timeout resolver and identd requests
 * allow clients through if requests failed
 */
static void
timeout_auth_queries_event(void *notused)
{
  dlink_node *ptr = NULL, *next_ptr = NULL;

  DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_list.head)
  {
    struct AuthRequest *auth = ptr->data;

    if (auth->timeout > CurrentTime)
      continue;

    fd_close(&auth->fd);

    if (IsDoingAuth(auth))
    {  
      ++ServerStats.is_abad;
      ClearAuth(auth);
      sendheader(auth->client, REPORT_FAIL_ID);
    }

    if (IsDNSPending(auth))
    {
      delete_resolver_queries(auth);
      ClearDNSPending(auth);
      sendheader(auth->client, REPORT_FAIL_DNS);
    }

    ilog(L_INFO, "DNS/AUTH timeout %s",
         get_client_name(auth->client, SHOW_IP));
    release_auth_client(auth);
  }
}

/*
 * auth_connect_callback() - deal with the result of comm_connect_tcp()
 *
 * If the connection failed, we simply close the auth fd and report
 * a failure. If the connection suceeded send the ident server a query
 * giving "theirport , ourport". The write is only attempted *once* so
 * it is deemed to be a fail if the entire write doesn't write all the
 * data given.  This shouldnt be a problem since the socket should have
 * a write buffer far greater than this message to store it in should
 * problems arise. -avalon
 */
static void
auth_connect_callback(fde_t *fd, int error, void *data)
{
  struct AuthRequest *auth = data;
  struct irc_ssaddr us;
  struct irc_ssaddr them;
  char authbuf[32];
  socklen_t ulen = sizeof(struct irc_ssaddr);
  socklen_t tlen = sizeof(struct irc_ssaddr);
  u_int16_t uport, tport;
#ifdef IPV6
  struct sockaddr_in6 *v6;
#else
  struct sockaddr_in *v4;
#endif

  if (error != COMM_OK)
  {
    auth_error(auth);
    return;
  }

  if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *) &us,
      (socklen_t *) &ulen) ||
      getpeername(auth->client->localClient->fd.fd, (struct sockaddr *) &them,
      (socklen_t *) &tlen))
  {
    ilog(L_INFO, "auth get{sock,peer}name error for %s",
        get_client_name(auth->client, SHOW_IP));
    auth_error(auth);
    return;
  }

#ifdef IPV6
  v6 = (struct sockaddr_in6 *)&us;
  uport = ntohs(v6->sin6_port);
  v6 = (struct sockaddr_in6 *)&them;
  tport = ntohs(v6->sin6_port);
  remove_ipv6_mapping(&us);
  remove_ipv6_mapping(&them);
#else
  v4 = (struct sockaddr_in *)&us;
  uport = ntohs(v4->sin_port);
  v4 = (struct sockaddr_in *)&them;
  tport = ntohs(v4->sin_port);
  us.ss_len = ulen;
  them.ss_len = tlen;
#endif
  
  ircsprintf(authbuf, "%u , %u\r\n", tport, uport); 

  if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
  {
    auth_error(auth);
    return;
  }

  read_auth_reply(&auth->fd, auth);
}

/*
 * read_auth_reply - read the reply (if any) from the ident server 
 * we connected to.
 * We only give it one shot, if the reply isn't good the first time
 * fail the authentication entirely. --Bleep
 */
#define AUTH_BUFSIZ 128

static void
read_auth_reply(fde_t *fd, void *data)
{
  struct AuthRequest *auth = data;
  char *s = NULL;
  char *t = NULL;
  int len;
  int count;
  char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */

  /* Why?
   * Well, recv() on many POSIX systems is a per-packet operation,
   * and we do not necessarily want this, because on lowspec machines,
   * the ident response may come back fragmented, thus resulting in an
   * invalid ident response, even if the ident response was really OK.
   *
   * So PLEASE do not change this code to recv without being aware of the
   * consequences.
   *
   *    --nenolod
   */
#ifndef _WIN32
  len = read(fd->fd, buf, AUTH_BUFSIZ);
#else
  len = recv(fd->fd, buf, AUTH_BUFSIZ, 0);
#endif
  
  if (len < 0)
  {
#ifdef _WIN32
    errno = WSAGetLastError();
#endif
    if (ignoreErrno(errno))
      comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
    else
      auth_error(auth);
    return;
  }

  if (len > 0)
  {
    buf[len] = '\0';

    if ((s = GetValidIdent(buf)))
    {
      t = auth->client->username;

      while (*s == '~' || *s == '^')
        s++;

      for (count = USERLEN; *s && count; s++)
      {
        if (*s == '@')
          break;
        if (!IsSpace(*s) && *s != ':' && *s != '[')
        {
          *t++ = *s;
          count--;
        }
      }

      *t = '\0';
    }
  }

  fd_close(fd);

  ClearAuth(auth);

  if (s == NULL)
  {
    sendheader(auth->client, REPORT_FAIL_ID);
    ++ServerStats.is_abad;
  }
  else
  {
    sendheader(auth->client, REPORT_FIN_ID);
    ++ServerStats.is_asuc;
    SetGotId(auth->client);
  }

  release_auth_client(auth);
}

/*
 * delete_auth()
 */
void 
delete_auth(struct AuthRequest *auth)
{
  if (IsDNSPending(auth))
    delete_resolver_queries(auth);

  fd_close(&auth->fd);
  dlinkDelete(&auth->node, &auth_doing_list);
  BlockHeapFree(auth_heap, auth);
}
Revision:	998
Committed:	Sun Aug 23 12:43:17 2009 UTC (17 years, 1 month ago) by michael
Content type:	text/x-csrc
Original Path:	*ircd-hybrid-7.2/src/s_auth.c*
File size:	15684 byte(s)
Log Message:	- change resolver/auth to use balloc memory pool - ircd.c: init_resolver() has to be called before read_conf_files(), otherwise recvfrom() aborts with ENOTSOCK in case there are configured connect{} blocks with a host that needs to be resolved on the very first configuration read.
#	User	Rev	Content
1	adx	30	/*
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	knight	31	* $Id$
23	adx	30	*/
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	michael	998	#include "balloc.h"
41	adx	30	#include "client.h"
42			#include "common.h"
43			#include "event.h"
44			#include "fdlist.h" /* fdlist_add */
45			#include "hook.h"
46			#include "irc_string.h"
47			#include "sprintf_irc.h"
48			#include "ircd.h"
49			#include "numeric.h"
50			#include "packet.h"
51			#include "irc_res.h"
52			#include "s_bsd.h"
53			#include "s_log.h"
54			#include "send.h"
55			#include "memory.h"
56
57			static const char *HeaderMessages[] = {
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"
66			};
67
68			enum {
69			REPORT_DO_DNS,
70			REPORT_FIN_DNS,
71			REPORT_FAIL_DNS,
72			REPORT_DO_ID,
73			REPORT_FIN_ID,
74			REPORT_FAIL_ID,
75			REPORT_IP_MISMATCH,
76			REPORT_HOST_TOOLONG
77			};
78
79			#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name)
80
81	michael	998	static BlockHeap *auth_heap = NULL;
82	michael	992	static dlink_list auth_doing_list = { NULL, NULL, 0 };
83	adx	30
84			static EVH timeout_auth_queries_event;
85
86			static PF read_auth_reply;
87			static CNCB auth_connect_callback;
88			static CBFUNC start_auth;
89
90			struct Callback *auth_cb = NULL;
91
92			/* init_auth()
93			*
94			* Initialise the auth code
95			*/
96			void
97			init_auth(void)
98			{
99	michael	998	auth_heap = BlockHeapCreate("auth", sizeof(struct AuthRequest), AUTH_HEAP_SIZE);
100	adx	30	auth_cb = register_callback("start_auth", start_auth);
101			eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
102			}
103
104			/*
105			* make_auth_request - allocate a new auth request
106			*/
107			static struct AuthRequest *
108			make_auth_request(struct Client *client)
109			{
110	michael	998	struct AuthRequest *request = BlockHeapAlloc(auth_heap);
111	adx	30
112	michael	992	client->localClient->auth = request;
113			request->client = client;
114			request->timeout = CurrentTime + CONNECTTIMEOUT;
115	adx	30
116	michael	650	return request;
117	adx	30	}
118
119			/*
120			* release_auth_client - release auth client from auth system
121			* this adds the client into the local client lists so it can be read by
122			* the main io processing loop
123			*/
124			void
125	michael	992	release_auth_client(struct AuthRequest *auth)
126	adx	30	{
127	michael	992	struct Client *client = auth->client;
128
129			if (IsDoingAuth(auth) \|\| IsDNSPending(auth))
130			return;
131
132			client->localClient->auth = NULL;
133			dlinkDelete(&auth->node, &auth_doing_list);
134	michael	998	BlockHeapFree(auth_heap, auth);
135	michael	992
136	adx	30	/*
137			* When a client has auth'ed, we want to start reading what it sends
138			* us. This is what read_packet() does.
139			* -- adrian
140			*/
141			client->localClient->allow_read = MAX_FLOOD;
142			comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
143	michael	650
144	michael	992	dlinkAdd(client, &client->node, &global_client_list);
145	michael	650
146	michael	664	client->since = client->lasttime = client->firsttime = CurrentTime;
147			client->flags \|= FLAGS_FINISHED_AUTH;
148	michael	650
149	adx	30	read_packet(&client->localClient->fd, client);
150			}
151
152			/*
153			* auth_dns_callback - called when resolver query finishes
154	michael	998	* if the query resulted in a successful search, name will contain
155			* a non-NULL pointer, otherwise name will be NULL.
156	adx	30	* set the client on it's way to a connection completion, regardless
157			* of success of failure
158			*/
159			static void
160	michael	992	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name)
161	adx	30	{
162	michael	992	struct AuthRequest *auth = vptr;
163	adx	30
164			ClearDNSPending(auth);
165
166	michael	992	if (name != NULL)
167	adx	30	{
168	michael	992	const struct sockaddr_in v4, v4dns;
169	adx	30	#ifdef IPV6
170	michael	992	const struct sockaddr_in6 v6, v6dns;
171	adx	30	#endif
172			int good = 1;
173
174			#ifdef IPV6
175			if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
176			{
177	michael	992	v6 = (const struct sockaddr_in6 *)&auth->client->localClient->ip;
178			v6dns = (const struct sockaddr_in6 *)addr;
179	adx	30	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
180			{
181			sendheader(auth->client, REPORT_IP_MISMATCH);
182			good = 0;
183			}
184			}
185			else
186			#endif
187			{
188	michael	992	v4 = (const struct sockaddr_in *)&auth->client->localClient->ip;
189			v4dns = (const struct sockaddr_in *)addr;
190	adx	30	if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
191			{
192			sendheader(auth->client, REPORT_IP_MISMATCH);
193			good = 0;
194			}
195			}
196	michael	992	if (good && strlen(name) <= HOSTLEN)
197	adx	30	{
198	michael	992	strlcpy(auth->client->host, name,
199	adx	30	sizeof(auth->client->host));
200			sendheader(auth->client, REPORT_FIN_DNS);
201			}
202	michael	992	else if (strlen(name) > HOSTLEN)
203	adx	30	sendheader(auth->client, REPORT_HOST_TOOLONG);
204			}
205			else
206	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
207	adx	30
208	michael	992	release_auth_client(auth);
209	adx	30	}
210
211			/*
212			* authsenderr - handle auth send errors
213			*/
214			static void
215			auth_error(struct AuthRequest *auth)
216			{
217	michael	896	++ServerStats.is_abad;
218	adx	30
219			fd_close(&auth->fd);
220
221			ClearAuth(auth);
222
223			sendheader(auth->client, REPORT_FAIL_ID);
224
225	michael	992	release_auth_client(auth);
226	adx	30	}
227
228			/*
229			* start_auth_query - Flag the client to show that an attempt to
230			* contact the ident server on
231			* the client's host. The connect and subsequently the socket are all put
232			* into 'non-blocking' mode. Should the connect or any later phase of the
233			* identifing process fail, it is aborted and the user is given a username
234			* of "unknown".
235			*/
236			static int
237			start_auth_query(struct AuthRequest *auth)
238			{
239			struct irc_ssaddr localaddr;
240			socklen_t locallen = sizeof(struct irc_ssaddr);
241			#ifdef IPV6
242			struct sockaddr_in6 *v6;
243			#else
244			struct sockaddr_in *v4;
245			#endif
246
247			/* open a socket of the same type as the client socket */
248			if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
249			SOCK_STREAM, 0, "ident") == -1)
250			{
251			report_error(L_ALL, "creating auth stream socket %s:%s",
252			get_client_name(auth->client, SHOW_IP), errno);
253			ilog(L_ERROR, "Unable to create auth socket for %s",
254			get_client_name(auth->client, SHOW_IP));
255	michael	896	++ServerStats.is_abad;
256	adx	30	return 0;
257			}
258
259			sendheader(auth->client, REPORT_DO_ID);
260
261			/*
262			* get the local address of the client and bind to that to
263			* make the auth request. This used to be done only for
264			* ifdef VIRTUAL_HOST, but needs to be done for all clients
265			* since the ident request must originate from that same address--
266			* and machines with multiple IP addresses are common now
267			*/
268			memset(&localaddr, 0, locallen);
269			getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
270			&locallen);
271
272			#ifdef IPV6
273			remove_ipv6_mapping(&localaddr);
274			v6 = (struct sockaddr_in6 *)&localaddr;
275			v6->sin6_port = htons(0);
276			#else
277			localaddr.ss_len = locallen;
278			v4 = (struct sockaddr_in *)&localaddr;
279			v4->sin_port = htons(0);
280			#endif
281			localaddr.ss_port = htons(0);
282
283			comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
284			(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
285			auth, auth->client->localClient->ip.ss.ss_family,
286			GlobalSetOptions.ident_timeout);
287			return 1; /* We suceed here for now */
288			}
289
290			/*
291			* GetValidIdent - parse ident query reply from identd server
292			*
293			* Inputs - pointer to ident buf
294			* Output - NULL if no valid ident found, otherwise pointer to name
295			* Side effects -
296			*/
297			/*
298			* A few questions have been asked about this mess, obviously
299			* it should have been commented better the first time.
300			* The original idea was to remove all references to libc from ircd-hybrid.
301			* Instead of having to write a replacement for sscanf(), I did a
302			* rather gruseome parser here so we could remove this function call.
303			* Note, that I had also removed a few floating point printfs as well (though
304			* now we are still stuck with a few...)
305			* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
306			* it would have been nice to remove some unneeded code.
307			* Oh well. If we don't remove libc stuff totally, then it would be
308			* far cleaner to use sscanf()
309			*
310			* - Dianora
311			*/
312			static char *
313			GetValidIdent(char *buf)
314			{
315			int remp = 0;
316			int locp = 0;
317			char* colon1Ptr;
318			char* colon2Ptr;
319			char* colon3Ptr;
320			char* commaPtr;
321			char* remotePortString;
322
323			/* All this to get rid of a sscanf() fun. */
324			remotePortString = buf;
325
326			if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
327			return 0;
328			*colon1Ptr = '\0';
329			colon1Ptr++;
330
331			if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
332			return 0;
333			*colon2Ptr = '\0';
334			colon2Ptr++;
335
336			if ((commaPtr = strchr(remotePortString, ',')) == NULL)
337			return 0;
338			*commaPtr = '\0';
339			commaPtr++;
340
341			if ((remp = atoi(remotePortString)) == 0)
342			return 0;
343
344			if ((locp = atoi(commaPtr)) == 0)
345			return 0;
346
347			/* look for USERID bordered by first pair of colons */
348			if (strstr(colon1Ptr, "USERID") == NULL)
349			return 0;
350
351			if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
352			return 0;
353			*colon3Ptr = '\0';
354			colon3Ptr++;
355			return (colon3Ptr);
356			}
357
358			/*
359			* start_auth
360			*
361			* inputs - pointer to client to auth
362			* output - NONE
363			* side effects - starts auth (identd) and dns queries for a client
364			*/
365			static void *
366			start_auth(va_list args)
367			{
368			struct Client client = va_arg(args, struct Client );
369			struct AuthRequest *auth = NULL;
370
371			assert(client != NULL);
372
373			auth = make_auth_request(client);
374
375			sendheader(client, REPORT_DO_DNS);
376
377	michael	992	SetDNSPending(auth);
378
379	adx	30	if (ConfigFileEntry.disable_auth == 0)
380	michael	992	{
381			SetDoingAuth(auth);
382	adx	30	start_auth_query(auth);
383	michael	992	}
384	adx	30
385	michael	992	dlinkAdd(auth, &auth->node, &auth_doing_list);
386	adx	30
387	michael	992	gethost_byaddr(auth_dns_callback, auth, &client->localClient->ip);
388
389	adx	30	return NULL;
390			}
391
392			/*
393			* timeout_auth_queries - timeout resolver and identd requests
394			* allow clients through if requests failed
395			*/
396			static void
397			timeout_auth_queries_event(void *notused)
398			{
399	michael	992	dlink_node ptr = NULL, next_ptr = NULL;
400	adx	30
401	michael	992	DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_list.head)
402	adx	30	{
403	michael	992	struct AuthRequest *auth = ptr->data;
404	adx	30
405	michael	992	if (auth->timeout > CurrentTime)
406			continue;
407	adx	30
408	michael	992	fd_close(&auth->fd);
409
410			if (IsDoingAuth(auth))
411			{
412	michael	896	++ServerStats.is_abad;
413	michael	998	ClearAuth(auth);
414	adx	30	sendheader(auth->client, REPORT_FAIL_ID);
415	michael	992	}
416	adx	30
417	michael	992	if (IsDNSPending(auth))
418			{
419			delete_resolver_queries(auth);
420	michael	998	ClearDNSPending(auth);
421	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
422			}
423	adx	30
424	michael	992	ilog(L_INFO, "DNS/AUTH timeout %s",
425			get_client_name(auth->client, SHOW_IP));
426			release_auth_client(auth);
427	adx	30	}
428			}
429
430			/*
431			* auth_connect_callback() - deal with the result of comm_connect_tcp()
432			*
433			* If the connection failed, we simply close the auth fd and report
434			* a failure. If the connection suceeded send the ident server a query
435			* giving "theirport , ourport". The write is only attempted once so
436			* it is deemed to be a fail if the entire write doesn't write all the
437			* data given. This shouldnt be a problem since the socket should have
438			* a write buffer far greater than this message to store it in should
439			* problems arise. -avalon
440			*/
441			static void
442			auth_connect_callback(fde_t fd, int error, void data)
443			{
444			struct AuthRequest *auth = data;
445			struct irc_ssaddr us;
446			struct irc_ssaddr them;
447			char authbuf[32];
448			socklen_t ulen = sizeof(struct irc_ssaddr);
449			socklen_t tlen = sizeof(struct irc_ssaddr);
450			u_int16_t uport, tport;
451			#ifdef IPV6
452			struct sockaddr_in6 *v6;
453			#else
454			struct sockaddr_in *v4;
455			#endif
456
457			if (error != COMM_OK)
458			{
459			auth_error(auth);
460			return;
461			}
462
463			if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *) &us,
464			(socklen_t *) &ulen) \|\|
465			getpeername(auth->client->localClient->fd.fd, (struct sockaddr *) &them,
466			(socklen_t *) &tlen))
467			{
468			ilog(L_INFO, "auth get{sock,peer}name error for %s",
469			get_client_name(auth->client, SHOW_IP));
470			auth_error(auth);
471			return;
472			}
473
474			#ifdef IPV6
475			v6 = (struct sockaddr_in6 *)&us;
476			uport = ntohs(v6->sin6_port);
477			v6 = (struct sockaddr_in6 *)&them;
478			tport = ntohs(v6->sin6_port);
479			remove_ipv6_mapping(&us);
480			remove_ipv6_mapping(&them);
481			#else
482			v4 = (struct sockaddr_in *)&us;
483			uport = ntohs(v4->sin_port);
484			v4 = (struct sockaddr_in *)&them;
485			tport = ntohs(v4->sin_port);
486			us.ss_len = ulen;
487			them.ss_len = tlen;
488			#endif
489
490			ircsprintf(authbuf, "%u , %u\r\n", tport, uport);
491
492			if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
493			{
494			auth_error(auth);
495			return;
496			}
497	michael	696
498	adx	30	read_auth_reply(&auth->fd, auth);
499			}
500
501			/*
502			* read_auth_reply - read the reply (if any) from the ident server
503			* we connected to.
504			* We only give it one shot, if the reply isn't good the first time
505			* fail the authentication entirely. --Bleep
506			*/
507			#define AUTH_BUFSIZ 128
508
509			static void
510			read_auth_reply(fde_t fd, void data)
511			{
512			struct AuthRequest *auth = data;
513			char *s = NULL;
514			char *t = NULL;
515			int len;
516			int count;
517			char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
518
519	nenolod	397	/* Why?
520			* Well, recv() on many POSIX systems is a per-packet operation,
521			* and we do not necessarily want this, because on lowspec machines,
522			* the ident response may come back fragmented, thus resulting in an
523			* invalid ident response, even if the ident response was really OK.
524			*
525			* So PLEASE do not change this code to recv without being aware of the
526			* consequences.
527			*
528			* --nenolod
529			*/
530			#ifndef _WIN32
531			len = read(fd->fd, buf, AUTH_BUFSIZ);
532			#else
533	adx	30	len = recv(fd->fd, buf, AUTH_BUFSIZ, 0);
534	nenolod	397	#endif
535	adx	30
536			if (len < 0)
537			{
538			#ifdef _WIN32
539			errno = WSAGetLastError();
540			#endif
541			if (ignoreErrno(errno))
542			comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
543			else
544			auth_error(auth);
545			return;
546			}
547
548			if (len > 0)
549			{
550			buf[len] = '\0';
551
552			if ((s = GetValidIdent(buf)))
553			{
554			t = auth->client->username;
555
556			while (s == '~' \|\| s == '^')
557			s++;
558
559			for (count = USERLEN; *s && count; s++)
560			{
561			if (*s == '@')
562			break;
563			if (!IsSpace(s) && s != ':' && *s != '[')
564			{
565			t++ = s;
566			count--;
567			}
568			}
569
570			*t = '\0';
571			}
572			}
573
574			fd_close(fd);
575
576			ClearAuth(auth);
577
578			if (s == NULL)
579			{
580			sendheader(auth->client, REPORT_FAIL_ID);
581	michael	896	++ServerStats.is_abad;
582	adx	30	}
583			else
584			{
585			sendheader(auth->client, REPORT_FIN_ID);
586	michael	896	++ServerStats.is_asuc;
587	adx	30	SetGotId(auth->client);
588			}
589
590	michael	992	release_auth_client(auth);
591	adx	30	}
592
593			/*
594			* delete_auth()
595			*/
596			void
597	michael	992	delete_auth(struct AuthRequest *auth)
598	adx	30	{
599	michael	992	if (IsDNSPending(auth))
600			delete_resolver_queries(auth);
601	adx	30
602	michael	992	fd_close(&auth->fd);
603			dlinkDelete(&auth->node, &auth_doing_list);
604	michael	998	BlockHeapFree(auth_heap, auth);
605	adx	30	}