trunk/src/s_auth.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2014 ircd-hybrid development team
 *
 *  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
 */

/*! \file s_auth.c
 * \brief Functions for querying a users ident.
 * \version $Id$
 */

/*
 * 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 "list.h"
#include "ircd_defs.h"
#include "fdlist.h"
#include "s_auth.h"
#include "conf.h"
#include "client.h"
#include "event.h"
#include "hook.h"
#include "irc_string.h"
#include "ircd.h"
#include "packet.h"
#include "irc_res.h"
#include "s_bsd.h"
#include "log.h"
#include "send.h"
#include "mempool.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;

/* auth_init
 *
 * Initialise the auth code
 */
void
auth_init(void)
{
  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 = &client->localClient->auth;

  memset(request, 0, sizeof(*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;

  if (IsInAuth(auth))
  {
    dlinkDelete(&auth->node, &auth_doing_list);
    ClearInAuth(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->localClient->since     = CurrentTime;
  client->localClient->lasttime  = CurrentTime;
  client->localClient->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(LOG_TYPE_IRCD, "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
 */
void
start_auth(struct Client *client)
{
  struct AuthRequest *auth = NULL;

  assert(client != NULL);

  auth = make_auth_request(client);
  SetInAuth(auth);
  dlinkAddTail(auth, &auth->node, &auth_doing_list);

  sendheader(client, REPORT_DO_DNS);

  SetDNSPending(auth);

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

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

/*
 * 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)
      break;

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

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

    ilog(LOG_TYPE_IRCD, "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);
  uint16_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,
      &ulen) ||
      getpeername(auth->client->localClient->fd.fd, (struct sockaddr *)&them,
      &tlen))
  {
    ilog(LOG_TYPE_IRCD, "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

  snprintf(authbuf, sizeof(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
   */
  len = read(fd->fd, buf, AUTH_BUFSIZ);

  if (len < 0)
  {
    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);

  if (IsDoingAuth(auth))
    fd_close(&auth->fd);

  if (IsInAuth(auth))
  {
    dlinkDelete(&auth->node, &auth_doing_list);
    ClearInAuth(auth);
  }
}
Revision:	2929
Committed:	Sat Jan 25 23:14:08 2014 UTC (12 years, 6 months ago) by michael
Content type:	text/x-csrc
File size:	15256 byte(s)
Log Message:	- s_auth.c, s_auth.h: optimized so we save unecessary auth_doing_list traversals. Patch provided by Adam.
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	2916	* Copyright (c) 1997-2014 ircd-hybrid development team
5	adx	30	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19			* USA
20			*/
21
22	michael	2916	/*! \file s_auth.c
23			* \brief Functions for querying a users ident.
24			* \version $Id$
25			*/
26
27	adx	30	/*
28			* Changes:
29			* July 6, 1999 - Rewrote most of the code here. When a client connects
30			* to the server and passes initial socket validation checks, it
31			* is owned by this module (auth) which returns it to the rest of the
32			* server when dns and auth queries are finished. Until the client is
33			* released, the server does not know it exists and does not process
34			* any messages from it.
35			* --Bleep Thomas Helvey <tomh@inxpress.net>
36			*/
37	michael	1309
38	adx	30	#include "stdinc.h"
39			#include "list.h"
40	michael	1011	#include "ircd_defs.h"
41			#include "fdlist.h"
42	adx	30	#include "s_auth.h"
43	michael	1309	#include "conf.h"
44	adx	30	#include "client.h"
45			#include "event.h"
46			#include "hook.h"
47			#include "irc_string.h"
48			#include "ircd.h"
49			#include "packet.h"
50			#include "irc_res.h"
51			#include "s_bsd.h"
52	michael	1309	#include "log.h"
53	adx	30	#include "send.h"
54	michael	1654	#include "mempool.h"
55	adx	30
56	michael	1011
57	michael	2916	static const char *HeaderMessages[] =
58			{
59	adx	30	":%s NOTICE AUTH :*** Looking up your hostname...",
60			":%s NOTICE AUTH :*** Found your hostname",
61			":%s NOTICE AUTH :*** Couldn't look up your hostname",
62			":%s NOTICE AUTH :*** Checking Ident",
63			":%s NOTICE AUTH :*** Got Ident response",
64			":%s NOTICE AUTH :*** No Ident response",
65			":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.",
66			":%s NOTICE AUTH :*** Your hostname is too long, ignoring hostname"
67			};
68
69	michael	2916	enum
70			{
71	adx	30	REPORT_DO_DNS,
72			REPORT_FIN_DNS,
73			REPORT_FAIL_DNS,
74			REPORT_DO_ID,
75			REPORT_FIN_ID,
76			REPORT_FAIL_ID,
77			REPORT_IP_MISMATCH,
78			REPORT_HOST_TOOLONG
79			};
80
81			#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name)
82
83	michael	992	static dlink_list auth_doing_list = { NULL, NULL, 0 };
84	adx	30
85			static EVH timeout_auth_queries_event;
86
87			static PF read_auth_reply;
88			static CNCB auth_connect_callback;
89
90	michael	1798	/* auth_init
91	adx	30	*
92			* Initialise the auth code
93			*/
94			void
95	michael	1798	auth_init(void)
96	adx	30	{
97			eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
98			}
99
100			/*
101			* make_auth_request - allocate a new auth request
102			*/
103			static struct AuthRequest *
104			make_auth_request(struct Client *client)
105			{
106	michael	2181	struct AuthRequest *request = &client->localClient->auth;
107	adx	30
108	michael	1654	memset(request, 0, sizeof(*request));
109	adx	30
110	michael	2181	request->client = client;
111			request->timeout = CurrentTime + CONNECTTIMEOUT;
112
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	michael	2929	if (IsInAuth(auth))
130			{
131	michael	2181	dlinkDelete(&auth->node, &auth_doing_list);
132	michael	2929	ClearInAuth(auth);
133			}
134	michael	992
135	adx	30	/*
136			* When a client has auth'ed, we want to start reading what it sends
137			* us. This is what read_packet() does.
138			* -- adrian
139			*/
140			client->localClient->allow_read = MAX_FLOOD;
141			comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
142	michael	650
143	michael	992	dlinkAdd(client, &client->node, &global_client_list);
144	michael	650
145	michael	1241	client->localClient->since = CurrentTime;
146			client->localClient->lasttime = CurrentTime;
147			client->localClient->firsttime = CurrentTime;
148	michael	664	client->flags \|= FLAGS_FINISHED_AUTH;
149	michael	650
150	adx	30	read_packet(&client->localClient->fd, client);
151			}
152	michael	2916
153	adx	30	/*
154			* auth_dns_callback - called when resolver query finishes
155	michael	998	* if the query resulted in a successful search, name will contain
156			* a non-NULL pointer, otherwise name will be NULL.
157	adx	30	* set the client on it's way to a connection completion, regardless
158			* of success of failure
159			*/
160			static void
161	michael	992	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name)
162	adx	30	{
163	michael	992	struct AuthRequest *auth = vptr;
164	adx	30
165			ClearDNSPending(auth);
166
167	michael	992	if (name != NULL)
168	adx	30	{
169	michael	992	const struct sockaddr_in v4, v4dns;
170	adx	30	#ifdef IPV6
171	michael	992	const struct sockaddr_in6 v6, v6dns;
172	adx	30	#endif
173			int good = 1;
174
175			#ifdef IPV6
176			if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
177			{
178	michael	992	v6 = (const struct sockaddr_in6 *)&auth->client->localClient->ip;
179			v6dns = (const struct sockaddr_in6 *)addr;
180	adx	30	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
181			{
182			sendheader(auth->client, REPORT_IP_MISMATCH);
183			good = 0;
184			}
185			}
186			else
187			#endif
188			{
189	michael	992	v4 = (const struct sockaddr_in *)&auth->client->localClient->ip;
190			v4dns = (const struct sockaddr_in *)addr;
191	adx	30	if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
192			{
193			sendheader(auth->client, REPORT_IP_MISMATCH);
194			good = 0;
195			}
196			}
197	michael	992	if (good && strlen(name) <= HOSTLEN)
198	adx	30	{
199	michael	992	strlcpy(auth->client->host, name,
200	michael	2916	sizeof(auth->client->host));
201	adx	30	sendheader(auth->client, REPORT_FIN_DNS);
202			}
203	michael	992	else if (strlen(name) > HOSTLEN)
204	adx	30	sendheader(auth->client, REPORT_HOST_TOOLONG);
205			}
206			else
207	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
208	adx	30
209	michael	992	release_auth_client(auth);
210	adx	30	}
211
212			/*
213			* authsenderr - handle auth send errors
214			*/
215			static void
216			auth_error(struct AuthRequest *auth)
217			{
218	michael	896	++ServerStats.is_abad;
219	adx	30
220			fd_close(&auth->fd);
221
222			ClearAuth(auth);
223
224			sendheader(auth->client, REPORT_FAIL_ID);
225
226	michael	992	release_auth_client(auth);
227	adx	30	}
228
229			/*
230	michael	2916	* start_auth_query - Flag the client to show that an attempt to
231	adx	30	* contact the ident server on
232			* the client's host. The connect and subsequently the socket are all put
233			* into 'non-blocking' mode. Should the connect or any later phase of the
234			* identifing process fail, it is aborted and the user is given a username
235			* of "unknown".
236			*/
237			static int
238			start_auth_query(struct AuthRequest *auth)
239			{
240			struct irc_ssaddr localaddr;
241			socklen_t locallen = sizeof(struct irc_ssaddr);
242			#ifdef IPV6
243			struct sockaddr_in6 *v6;
244			#else
245			struct sockaddr_in *v4;
246			#endif
247
248			/* open a socket of the same type as the client socket */
249			if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
250			SOCK_STREAM, 0, "ident") == -1)
251			{
252	michael	2916	report_error(L_ALL, "creating auth stream socket %s:%s",
253			get_client_name(auth->client, SHOW_IP), errno);
254	michael	1247	ilog(LOG_TYPE_IRCD, "Unable to create auth socket for %s",
255	adx	30	get_client_name(auth->client, SHOW_IP));
256	michael	896	++ServerStats.is_abad;
257	adx	30	return 0;
258			}
259
260			sendheader(auth->client, REPORT_DO_ID);
261
262	michael	2916	/*
263	adx	30	* get the local address of the client and bind to that to
264			* make the auth request. This used to be done only for
265			* ifdef VIRTUAL_HOST, but needs to be done for all clients
266			* since the ident request must originate from that same address--
267			* and machines with multiple IP addresses are common now
268			*/
269			memset(&localaddr, 0, locallen);
270			getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
271			&locallen);
272
273			#ifdef IPV6
274			remove_ipv6_mapping(&localaddr);
275			v6 = (struct sockaddr_in6 *)&localaddr;
276			v6->sin6_port = htons(0);
277			#else
278			localaddr.ss_len = locallen;
279			v4 = (struct sockaddr_in *)&localaddr;
280			v4->sin_port = htons(0);
281			#endif
282			localaddr.ss_port = htons(0);
283
284	michael	2916	comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
285			(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
286			auth, auth->client->localClient->ip.ss.ss_family,
287	adx	30	GlobalSetOptions.ident_timeout);
288			return 1; /* We suceed here for now */
289			}
290
291			/*
292			* GetValidIdent - parse ident query reply from identd server
293	michael	2916	*
294	adx	30	* Inputs - pointer to ident buf
295			* Output - NULL if no valid ident found, otherwise pointer to name
296			* Side effects -
297			*/
298			/*
299			* A few questions have been asked about this mess, obviously
300			* it should have been commented better the first time.
301			* The original idea was to remove all references to libc from ircd-hybrid.
302			* Instead of having to write a replacement for sscanf(), I did a
303			* rather gruseome parser here so we could remove this function call.
304			* Note, that I had also removed a few floating point printfs as well (though
305			* now we are still stuck with a few...)
306			* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
307			* it would have been nice to remove some unneeded code.
308			* Oh well. If we don't remove libc stuff totally, then it would be
309			* far cleaner to use sscanf()
310			*
311			* - Dianora
312			*/
313			static char *
314			GetValidIdent(char *buf)
315			{
316			int remp = 0;
317			int locp = 0;
318			char* colon1Ptr;
319			char* colon2Ptr;
320			char* colon3Ptr;
321			char* commaPtr;
322			char* remotePortString;
323
324			/* All this to get rid of a sscanf() fun. */
325			remotePortString = buf;
326	michael	2916
327	adx	30	if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
328			return 0;
329			*colon1Ptr = '\0';
330			colon1Ptr++;
331
332			if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
333			return 0;
334			*colon2Ptr = '\0';
335			colon2Ptr++;
336	michael	2916
337	adx	30	if ((commaPtr = strchr(remotePortString, ',')) == NULL)
338			return 0;
339			*commaPtr = '\0';
340			commaPtr++;
341
342			if ((remp = atoi(remotePortString)) == 0)
343			return 0;
344	michael	2916
345	adx	30	if ((locp = atoi(commaPtr)) == 0)
346			return 0;
347
348			/* look for USERID bordered by first pair of colons */
349			if (strstr(colon1Ptr, "USERID") == NULL)
350			return 0;
351
352			if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
353			return 0;
354			*colon3Ptr = '\0';
355			colon3Ptr++;
356			return (colon3Ptr);
357			}
358
359			/*
360	michael	2916	* start_auth
361	adx	30	*
362			* inputs - pointer to client to auth
363			* output - NONE
364			* side effects - starts auth (identd) and dns queries for a client
365			*/
366	michael	2916	void
367	michael	2181	start_auth(struct Client *client)
368	adx	30	{
369			struct AuthRequest *auth = NULL;
370
371			assert(client != NULL);
372
373			auth = make_auth_request(client);
374	michael	2929	SetInAuth(auth);
375			dlinkAddTail(auth, &auth->node, &auth_doing_list);
376	adx	30
377			sendheader(client, REPORT_DO_DNS);
378
379	michael	992	SetDNSPending(auth);
380
381	adx	30	if (ConfigFileEntry.disable_auth == 0)
382	michael	992	{
383			SetDoingAuth(auth);
384	adx	30	start_auth_query(auth);
385	michael	992	}
386	adx	30
387	michael	992	gethost_byaddr(auth_dns_callback, auth, &client->localClient->ip);
388	adx	30	}
389
390			/*
391			* timeout_auth_queries - timeout resolver and identd requests
392			* allow clients through if requests failed
393			*/
394			static void
395			timeout_auth_queries_event(void *notused)
396			{
397	michael	992	dlink_node ptr = NULL, next_ptr = NULL;
398	adx	30
399	michael	992	DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_list.head)
400	adx	30	{
401	michael	992	struct AuthRequest *auth = ptr->data;
402	adx	30
403	michael	992	if (auth->timeout > CurrentTime)
404	michael	2929	break;
405	adx	30
406	michael	992	if (IsDoingAuth(auth))
407	michael	2916	{
408	michael	896	++ServerStats.is_abad;
409	michael	1000	fd_close(&auth->fd);
410	michael	998	ClearAuth(auth);
411	adx	30	sendheader(auth->client, REPORT_FAIL_ID);
412	michael	992	}
413	adx	30
414	michael	992	if (IsDNSPending(auth))
415			{
416			delete_resolver_queries(auth);
417	michael	998	ClearDNSPending(auth);
418	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
419			}
420	adx	30
421	michael	1247	ilog(LOG_TYPE_IRCD, "DNS/AUTH timeout %s",
422	michael	992	get_client_name(auth->client, SHOW_IP));
423			release_auth_client(auth);
424	adx	30	}
425			}
426
427			/*
428			* auth_connect_callback() - deal with the result of comm_connect_tcp()
429			*
430			* If the connection failed, we simply close the auth fd and report
431			* a failure. If the connection suceeded send the ident server a query
432			* giving "theirport , ourport". The write is only attempted once so
433			* it is deemed to be a fail if the entire write doesn't write all the
434			* data given. This shouldnt be a problem since the socket should have
435			* a write buffer far greater than this message to store it in should
436			* problems arise. -avalon
437			*/
438			static void
439			auth_connect_callback(fde_t fd, int error, void data)
440			{
441			struct AuthRequest *auth = data;
442			struct irc_ssaddr us;
443			struct irc_ssaddr them;
444			char authbuf[32];
445			socklen_t ulen = sizeof(struct irc_ssaddr);
446			socklen_t tlen = sizeof(struct irc_ssaddr);
447	michael	1032	uint16_t uport, tport;
448	adx	30	#ifdef IPV6
449			struct sockaddr_in6 *v6;
450			#else
451			struct sockaddr_in *v4;
452			#endif
453
454			if (error != COMM_OK)
455			{
456			auth_error(auth);
457			return;
458			}
459
460	michael	1013	if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *)&us,
461			&ulen) \|\|
462			getpeername(auth->client->localClient->fd.fd, (struct sockaddr *)&them,
463			&tlen))
464	adx	30	{
465	michael	1247	ilog(LOG_TYPE_IRCD, "auth get{sock,peer}name error for %s",
466	adx	30	get_client_name(auth->client, SHOW_IP));
467			auth_error(auth);
468			return;
469			}
470
471			#ifdef IPV6
472			v6 = (struct sockaddr_in6 *)&us;
473			uport = ntohs(v6->sin6_port);
474			v6 = (struct sockaddr_in6 *)&them;
475			tport = ntohs(v6->sin6_port);
476			remove_ipv6_mapping(&us);
477			remove_ipv6_mapping(&them);
478			#else
479			v4 = (struct sockaddr_in *)&us;
480			uport = ntohs(v4->sin_port);
481			v4 = (struct sockaddr_in *)&them;
482			tport = ntohs(v4->sin_port);
483			us.ss_len = ulen;
484			them.ss_len = tlen;
485			#endif
486	michael	2916
487	michael	1124	snprintf(authbuf, sizeof(authbuf), "%u , %u\r\n", tport, uport);
488	adx	30
489			if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
490			{
491			auth_error(auth);
492			return;
493			}
494	michael	696
495	adx	30	read_auth_reply(&auth->fd, auth);
496			}
497
498			/*
499	michael	2916	* read_auth_reply - read the reply (if any) from the ident server
500	adx	30	* we connected to.
501			* We only give it one shot, if the reply isn't good the first time
502			* fail the authentication entirely. --Bleep
503			*/
504			#define AUTH_BUFSIZ 128
505
506			static void
507			read_auth_reply(fde_t fd, void data)
508			{
509			struct AuthRequest *auth = data;
510			char *s = NULL;
511			char *t = NULL;
512			int len;
513			int count;
514			char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
515
516	nenolod	397	/* Why?
517			* Well, recv() on many POSIX systems is a per-packet operation,
518			* and we do not necessarily want this, because on lowspec machines,
519			* the ident response may come back fragmented, thus resulting in an
520			* invalid ident response, even if the ident response was really OK.
521			*
522			* So PLEASE do not change this code to recv without being aware of the
523			* consequences.
524			*
525			* --nenolod
526			*/
527			len = read(fd->fd, buf, AUTH_BUFSIZ);
528	michael	1001
529	adx	30	if (len < 0)
530			{
531			if (ignoreErrno(errno))
532			comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
533			else
534			auth_error(auth);
535			return;
536			}
537
538			if (len > 0)
539			{
540			buf[len] = '\0';
541
542			if ((s = GetValidIdent(buf)))
543			{
544			t = auth->client->username;
545
546			while (s == '~' \|\| s == '^')
547			s++;
548
549			for (count = USERLEN; *s && count; s++)
550			{
551			if (*s == '@')
552			break;
553			if (!IsSpace(s) && s != ':' && *s != '[')
554			{
555			t++ = s;
556			count--;
557			}
558			}
559
560			*t = '\0';
561			}
562			}
563
564			fd_close(fd);
565
566			ClearAuth(auth);
567
568			if (s == NULL)
569			{
570			sendheader(auth->client, REPORT_FAIL_ID);
571	michael	896	++ServerStats.is_abad;
572	adx	30	}
573			else
574			{
575			sendheader(auth->client, REPORT_FIN_ID);
576	michael	896	++ServerStats.is_asuc;
577	adx	30	SetGotId(auth->client);
578			}
579
580	michael	992	release_auth_client(auth);
581	adx	30	}
582
583			/*
584			* delete_auth()
585			*/
586	michael	2916	void
587	michael	992	delete_auth(struct AuthRequest *auth)
588	adx	30	{
589	michael	992	if (IsDNSPending(auth))
590			delete_resolver_queries(auth);
591	adx	30
592	michael	1000	if (IsDoingAuth(auth))
593			fd_close(&auth->fd);
594
595	michael	2929	if (IsInAuth(auth))
596			{
597	michael	2181	dlinkDelete(&auth->node, &auth_doing_list);
598	michael	2929	ClearInAuth(auth);
599			}
600	adx	30	}