ircd-hybrid-7.2/src/s_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 "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 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_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 = MyMalloc(sizeof(struct AuthRequest));

  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);

  /*
   * 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, hp will contain
 * a non-null pointer, otherwise hp 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;
      sendheader(auth->client, REPORT_FAIL_ID);
    }

    if (IsDNSPending(auth))
    {
      delete_resolver_queries(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);
  MyFree(auth);
}
Revision:	992
Committed:	Mon Aug 17 19:19:16 2009 UTC (14 years, 8 months ago) by michael
Content type:	text/x-csrc
File size:	15448 byte(s)
Log Message:	- fix possible auth/dns related memleaks
#	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			#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	michael	992	static dlink_list auth_doing_list = { NULL, NULL, 0 };
81	adx	30
82			static EVH timeout_auth_queries_event;
83
84			static PF read_auth_reply;
85			static CNCB auth_connect_callback;
86			static CBFUNC start_auth;
87
88			struct Callback *auth_cb = NULL;
89
90			/* init_auth()
91			*
92			* Initialise the auth code
93			*/
94			void
95			init_auth(void)
96			{
97			auth_cb = register_callback("start_auth", start_auth);
98			eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
99			}
100
101			/*
102			* make_auth_request - allocate a new auth request
103			*/
104			static struct AuthRequest *
105			make_auth_request(struct Client *client)
106			{
107			struct AuthRequest *request = MyMalloc(sizeof(struct AuthRequest));
108
109	michael	992	client->localClient->auth = request;
110			request->client = client;
111			request->timeout = CurrentTime + CONNECTTIMEOUT;
112	adx	30
113	michael	650	return request;
114	adx	30	}
115
116			/*
117			* release_auth_client - release auth client from auth system
118			* this adds the client into the local client lists so it can be read by
119			* the main io processing loop
120			*/
121			void
122	michael	992	release_auth_client(struct AuthRequest *auth)
123	adx	30	{
124	michael	992	struct Client *client = auth->client;
125
126			if (IsDoingAuth(auth) \|\| IsDNSPending(auth))
127			return;
128
129			client->localClient->auth = NULL;
130			dlinkDelete(&auth->node, &auth_doing_list);
131
132	adx	30	/*
133			* When a client has auth'ed, we want to start reading what it sends
134			* us. This is what read_packet() does.
135			* -- adrian
136			*/
137			client->localClient->allow_read = MAX_FLOOD;
138			comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
139	michael	650
140	michael	992	dlinkAdd(client, &client->node, &global_client_list);
141	michael	650
142	michael	664	client->since = client->lasttime = client->firsttime = CurrentTime;
143			client->flags \|= FLAGS_FINISHED_AUTH;
144	michael	650
145	adx	30	read_packet(&client->localClient->fd, client);
146			}
147
148			/*
149			* auth_dns_callback - called when resolver query finishes
150			* if the query resulted in a successful search, hp will contain
151			* a non-null pointer, otherwise hp will be null.
152			* set the client on it's way to a connection completion, regardless
153			* of success of failure
154			*/
155			static void
156	michael	992	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name)
157	adx	30	{
158	michael	992	struct AuthRequest *auth = vptr;
159	adx	30
160			ClearDNSPending(auth);
161
162	michael	992	if (name != NULL)
163	adx	30	{
164	michael	992	const struct sockaddr_in v4, v4dns;
165	adx	30	#ifdef IPV6
166	michael	992	const struct sockaddr_in6 v6, v6dns;
167	adx	30	#endif
168			int good = 1;
169
170			#ifdef IPV6
171			if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
172			{
173	michael	992	v6 = (const struct sockaddr_in6 *)&auth->client->localClient->ip;
174			v6dns = (const struct sockaddr_in6 *)addr;
175	adx	30	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
176			{
177			sendheader(auth->client, REPORT_IP_MISMATCH);
178			good = 0;
179			}
180			}
181			else
182			#endif
183			{
184	michael	992	v4 = (const struct sockaddr_in *)&auth->client->localClient->ip;
185			v4dns = (const struct sockaddr_in *)addr;
186	adx	30	if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
187			{
188			sendheader(auth->client, REPORT_IP_MISMATCH);
189			good = 0;
190			}
191			}
192	michael	992	if (good && strlen(name) <= HOSTLEN)
193	adx	30	{
194	michael	992	strlcpy(auth->client->host, name,
195	adx	30	sizeof(auth->client->host));
196			sendheader(auth->client, REPORT_FIN_DNS);
197			}
198	michael	992	else if (strlen(name) > HOSTLEN)
199	adx	30	sendheader(auth->client, REPORT_HOST_TOOLONG);
200			}
201			else
202	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
203	adx	30
204	michael	992	release_auth_client(auth);
205	adx	30	}
206
207			/*
208			* authsenderr - handle auth send errors
209			*/
210			static void
211			auth_error(struct AuthRequest *auth)
212			{
213	michael	896	++ServerStats.is_abad;
214	adx	30
215			fd_close(&auth->fd);
216
217			ClearAuth(auth);
218
219			sendheader(auth->client, REPORT_FAIL_ID);
220
221	michael	992	release_auth_client(auth);
222	adx	30	}
223
224			/*
225			* start_auth_query - Flag the client to show that an attempt to
226			* contact the ident server on
227			* the client's host. The connect and subsequently the socket are all put
228			* into 'non-blocking' mode. Should the connect or any later phase of the
229			* identifing process fail, it is aborted and the user is given a username
230			* of "unknown".
231			*/
232			static int
233			start_auth_query(struct AuthRequest *auth)
234			{
235			struct irc_ssaddr localaddr;
236			socklen_t locallen = sizeof(struct irc_ssaddr);
237			#ifdef IPV6
238			struct sockaddr_in6 *v6;
239			#else
240			struct sockaddr_in *v4;
241			#endif
242
243			/* open a socket of the same type as the client socket */
244			if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
245			SOCK_STREAM, 0, "ident") == -1)
246			{
247			report_error(L_ALL, "creating auth stream socket %s:%s",
248			get_client_name(auth->client, SHOW_IP), errno);
249			ilog(L_ERROR, "Unable to create auth socket for %s",
250			get_client_name(auth->client, SHOW_IP));
251	michael	896	++ServerStats.is_abad;
252	adx	30	return 0;
253			}
254
255			sendheader(auth->client, REPORT_DO_ID);
256
257			/*
258			* get the local address of the client and bind to that to
259			* make the auth request. This used to be done only for
260			* ifdef VIRTUAL_HOST, but needs to be done for all clients
261			* since the ident request must originate from that same address--
262			* and machines with multiple IP addresses are common now
263			*/
264			memset(&localaddr, 0, locallen);
265			getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
266			&locallen);
267
268			#ifdef IPV6
269			remove_ipv6_mapping(&localaddr);
270			v6 = (struct sockaddr_in6 *)&localaddr;
271			v6->sin6_port = htons(0);
272			#else
273			localaddr.ss_len = locallen;
274			v4 = (struct sockaddr_in *)&localaddr;
275			v4->sin_port = htons(0);
276			#endif
277			localaddr.ss_port = htons(0);
278
279			comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
280			(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
281			auth, auth->client->localClient->ip.ss.ss_family,
282			GlobalSetOptions.ident_timeout);
283			return 1; /* We suceed here for now */
284			}
285
286			/*
287			* GetValidIdent - parse ident query reply from identd server
288			*
289			* Inputs - pointer to ident buf
290			* Output - NULL if no valid ident found, otherwise pointer to name
291			* Side effects -
292			*/
293			/*
294			* A few questions have been asked about this mess, obviously
295			* it should have been commented better the first time.
296			* The original idea was to remove all references to libc from ircd-hybrid.
297			* Instead of having to write a replacement for sscanf(), I did a
298			* rather gruseome parser here so we could remove this function call.
299			* Note, that I had also removed a few floating point printfs as well (though
300			* now we are still stuck with a few...)
301			* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
302			* it would have been nice to remove some unneeded code.
303			* Oh well. If we don't remove libc stuff totally, then it would be
304			* far cleaner to use sscanf()
305			*
306			* - Dianora
307			*/
308			static char *
309			GetValidIdent(char *buf)
310			{
311			int remp = 0;
312			int locp = 0;
313			char* colon1Ptr;
314			char* colon2Ptr;
315			char* colon3Ptr;
316			char* commaPtr;
317			char* remotePortString;
318
319			/* All this to get rid of a sscanf() fun. */
320			remotePortString = buf;
321
322			if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
323			return 0;
324			*colon1Ptr = '\0';
325			colon1Ptr++;
326
327			if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
328			return 0;
329			*colon2Ptr = '\0';
330			colon2Ptr++;
331
332			if ((commaPtr = strchr(remotePortString, ',')) == NULL)
333			return 0;
334			*commaPtr = '\0';
335			commaPtr++;
336
337			if ((remp = atoi(remotePortString)) == 0)
338			return 0;
339
340			if ((locp = atoi(commaPtr)) == 0)
341			return 0;
342
343			/* look for USERID bordered by first pair of colons */
344			if (strstr(colon1Ptr, "USERID") == NULL)
345			return 0;
346
347			if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
348			return 0;
349			*colon3Ptr = '\0';
350			colon3Ptr++;
351			return (colon3Ptr);
352			}
353
354			/*
355			* start_auth
356			*
357			* inputs - pointer to client to auth
358			* output - NONE
359			* side effects - starts auth (identd) and dns queries for a client
360			*/
361			static void *
362			start_auth(va_list args)
363			{
364			struct Client client = va_arg(args, struct Client );
365			struct AuthRequest *auth = NULL;
366
367			assert(client != NULL);
368
369			auth = make_auth_request(client);
370
371			sendheader(client, REPORT_DO_DNS);
372
373	michael	992	SetDNSPending(auth);
374
375	adx	30	if (ConfigFileEntry.disable_auth == 0)
376	michael	992	{
377			SetDoingAuth(auth);
378	adx	30	start_auth_query(auth);
379	michael	992	}
380	adx	30
381	michael	992	dlinkAdd(auth, &auth->node, &auth_doing_list);
382	adx	30
383	michael	992	gethost_byaddr(auth_dns_callback, auth, &client->localClient->ip);
384
385	adx	30	return NULL;
386			}
387
388			/*
389			* timeout_auth_queries - timeout resolver and identd requests
390			* allow clients through if requests failed
391			*/
392			static void
393			timeout_auth_queries_event(void *notused)
394			{
395	michael	992	dlink_node ptr = NULL, next_ptr = NULL;
396	adx	30
397	michael	992	DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_list.head)
398	adx	30	{
399	michael	992	struct AuthRequest *auth = ptr->data;
400	adx	30
401	michael	992	if (auth->timeout > CurrentTime)
402			continue;
403	adx	30
404	michael	992	fd_close(&auth->fd);
405
406			if (IsDoingAuth(auth))
407			{
408	michael	896	++ServerStats.is_abad;
409	adx	30	sendheader(auth->client, REPORT_FAIL_ID);
410	michael	992	}
411	adx	30
412	michael	992	if (IsDNSPending(auth))
413			{
414			delete_resolver_queries(auth);
415			sendheader(auth->client, REPORT_FAIL_DNS);
416			}
417	adx	30
418	michael	992	ilog(L_INFO, "DNS/AUTH timeout %s",
419			get_client_name(auth->client, SHOW_IP));
420			release_auth_client(auth);
421	adx	30	}
422			}
423
424			/*
425			* auth_connect_callback() - deal with the result of comm_connect_tcp()
426			*
427			* If the connection failed, we simply close the auth fd and report
428			* a failure. If the connection suceeded send the ident server a query
429			* giving "theirport , ourport". The write is only attempted once so
430			* it is deemed to be a fail if the entire write doesn't write all the
431			* data given. This shouldnt be a problem since the socket should have
432			* a write buffer far greater than this message to store it in should
433			* problems arise. -avalon
434			*/
435			static void
436			auth_connect_callback(fde_t fd, int error, void data)
437			{
438			struct AuthRequest *auth = data;
439			struct irc_ssaddr us;
440			struct irc_ssaddr them;
441			char authbuf[32];
442			socklen_t ulen = sizeof(struct irc_ssaddr);
443			socklen_t tlen = sizeof(struct irc_ssaddr);
444			u_int16_t uport, tport;
445			#ifdef IPV6
446			struct sockaddr_in6 *v6;
447			#else
448			struct sockaddr_in *v4;
449			#endif
450
451			if (error != COMM_OK)
452			{
453			auth_error(auth);
454			return;
455			}
456
457			if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *) &us,
458			(socklen_t *) &ulen) \|\|
459			getpeername(auth->client->localClient->fd.fd, (struct sockaddr *) &them,
460			(socklen_t *) &tlen))
461			{
462			ilog(L_INFO, "auth get{sock,peer}name error for %s",
463			get_client_name(auth->client, SHOW_IP));
464			auth_error(auth);
465			return;
466			}
467
468			#ifdef IPV6
469			v6 = (struct sockaddr_in6 *)&us;
470			uport = ntohs(v6->sin6_port);
471			v6 = (struct sockaddr_in6 *)&them;
472			tport = ntohs(v6->sin6_port);
473			remove_ipv6_mapping(&us);
474			remove_ipv6_mapping(&them);
475			#else
476			v4 = (struct sockaddr_in *)&us;
477			uport = ntohs(v4->sin_port);
478			v4 = (struct sockaddr_in *)&them;
479			tport = ntohs(v4->sin_port);
480			us.ss_len = ulen;
481			them.ss_len = tlen;
482			#endif
483
484			ircsprintf(authbuf, "%u , %u\r\n", tport, uport);
485
486			if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
487			{
488			auth_error(auth);
489			return;
490			}
491	michael	696
492	adx	30	read_auth_reply(&auth->fd, auth);
493			}
494
495			/*
496			* read_auth_reply - read the reply (if any) from the ident server
497			* we connected to.
498			* We only give it one shot, if the reply isn't good the first time
499			* fail the authentication entirely. --Bleep
500			*/
501			#define AUTH_BUFSIZ 128
502
503			static void
504			read_auth_reply(fde_t fd, void data)
505			{
506			struct AuthRequest *auth = data;
507			char *s = NULL;
508			char *t = NULL;
509			int len;
510			int count;
511			char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
512
513	nenolod	397	/* Why?
514			* Well, recv() on many POSIX systems is a per-packet operation,
515			* and we do not necessarily want this, because on lowspec machines,
516			* the ident response may come back fragmented, thus resulting in an
517			* invalid ident response, even if the ident response was really OK.
518			*
519			* So PLEASE do not change this code to recv without being aware of the
520			* consequences.
521			*
522			* --nenolod
523			*/
524			#ifndef _WIN32
525			len = read(fd->fd, buf, AUTH_BUFSIZ);
526			#else
527	adx	30	len = recv(fd->fd, buf, AUTH_BUFSIZ, 0);
528	nenolod	397	#endif
529	adx	30
530			if (len < 0)
531			{
532			#ifdef _WIN32
533			errno = WSAGetLastError();
534			#endif
535			if (ignoreErrno(errno))
536			comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
537			else
538			auth_error(auth);
539			return;
540			}
541
542			if (len > 0)
543			{
544			buf[len] = '\0';
545
546			if ((s = GetValidIdent(buf)))
547			{
548			t = auth->client->username;
549
550			while (s == '~' \|\| s == '^')
551			s++;
552
553			for (count = USERLEN; *s && count; s++)
554			{
555			if (*s == '@')
556			break;
557			if (!IsSpace(s) && s != ':' && *s != '[')
558			{
559			t++ = s;
560			count--;
561			}
562			}
563
564			*t = '\0';
565			}
566			}
567
568			fd_close(fd);
569
570			ClearAuth(auth);
571
572			if (s == NULL)
573			{
574			sendheader(auth->client, REPORT_FAIL_ID);
575	michael	896	++ServerStats.is_abad;
576	adx	30	}
577			else
578			{
579			sendheader(auth->client, REPORT_FIN_ID);
580	michael	896	++ServerStats.is_asuc;
581	adx	30	SetGotId(auth->client);
582			}
583
584	michael	992	release_auth_client(auth);
585	adx	30	}
586
587			/*
588			* delete_auth()
589			*/
590			void
591	michael	992	delete_auth(struct AuthRequest *auth)
592	adx	30	{
593	michael	992	if (IsDNSPending(auth))
594			delete_resolver_queries(auth);
595	adx	30
596	michael	992	fd_close(&auth->fd);
597			dlinkDelete(&auth->node, &auth_doing_list);
598			MyFree(auth);
599	adx	30	}