trunk/src/auth.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2019 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 *  USA
 */

/*! \file auth.c
 * \brief Implementation of DNS and ident lookups.
 * \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 "auth.h"
#include "conf.h"
#include "client.h"
#include "event.h"
#include "irc_string.h"
#include "ircd.h"
#include "packet.h"
#include "res.h"
#include "s_bsd.h"
#include "log.h"
#include "send.h"
#include "memory.h"
#include "misc.h"


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,
  REPORT_HOST_INVALID
};

static const char *const HeaderMessages[] =
{
  [REPORT_DO_DNS] = ":*** Looking up your hostname",
  [REPORT_FIN_DNS] = ":*** Found your hostname",
  [REPORT_FAIL_DNS] = ":*** Couldn't look up your hostname",
  [REPORT_DO_ID] = ":*** Checking Ident",
  [REPORT_FIN_ID] = ":*** Got Ident response",
  [REPORT_FAIL_ID] = ":*** No Ident response",
  [REPORT_IP_MISMATCH] = ":*** Your forward and reverse DNS do not match, ignoring hostname",
  [REPORT_HOST_TOOLONG] = ":*** Your hostname is too long, ignoring hostname",
  [REPORT_HOST_INVALID] = ":*** Your hostname contains illegal characters, ignoring hostname"
};

#define auth_sendheader(c, i) sendto_one_notice((c), &me, "%s", HeaderMessages[(i)])


/*! \brief Allocate a new auth request.
 * \param client The client being looked up.
 * \return The newly allocated auth request.
 */
static struct AuthRequest *
auth_make(struct Client *client)
{
  struct AuthRequest *auth = xcalloc(sizeof(*auth));

  auth->client = client;
  auth->client->connection->auth = auth;

  return auth;
}

/*! \brief Free memory
 * \param auth The allocated auth request to cleanup.
 */
static void
auth_free(struct AuthRequest *auth)
{
  auth->client = NULL;
  xfree(auth);
}

/*! \brief 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.
 * \param auth Pointer to AuthRequest struct to release
 */
static void
auth_release_client(struct AuthRequest *auth)
{
  struct Client *client = auth->client;

  assert(client);
  assert(client->connection);

  if (auth->ident_pending == true || auth->dns_pending == true)
    return;

  auth_free(auth);
  client->connection->auth = NULL;

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

  client->connection->since     = CurrentTime;
  client->connection->lasttime  = CurrentTime;
  client->connection->firsttime = CurrentTime;
  AddFlag(client, FLAGS_FINISHED_AUTH);

  strlcpy(client->realhost, client->host, sizeof(client->realhost));

  read_packet(client->connection->fd, client);
}

/*! Checks if a hostname is valid and doesn't contain illegal characters
 * \param hostname The string to verify
 * \return 1 if it is valid, 0 if it isn't
 */
static bool
auth_verify_hostname(const char *hostname)
{
  const char *p = hostname;

  assert(p);

  if (EmptyString(p) || *p == '.' || *p == ':')
    return false;

  for (; *p; ++p)
    if (!IsHostChar(*p))
      return false;

  return true;
}

/*! \brief Handle a complete DNS lookup. Send the client on its way to a connection
 *         completion, regardless of success or failure.
 * \param vptr The pending struct AuthRequest.
 * \param addr IP address being resolved.
 * \param name Resolved name, or NULL if lookup failed.
 * \param namelength String length of the resolved hostname pointed by 'name'
 */
static void
auth_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name, size_t namelength)
{
  struct AuthRequest *const auth = vptr;

  assert(auth->client);
  assert(auth->client->connection);

  auth->dns_pending = false;

  if (namelength == 0)
    auth_sendheader(auth->client, REPORT_FAIL_DNS);
  else if (address_compare(addr, &auth->client->ip, false) == false)
    auth_sendheader(auth->client, REPORT_IP_MISMATCH);
  else if (namelength > HOSTLEN)
    auth_sendheader(auth->client, REPORT_HOST_TOOLONG);
  else if (auth_verify_hostname(name) == false)
    auth_sendheader(auth->client, REPORT_HOST_INVALID);
  else
  {
    strlcpy(auth->client->host, name, sizeof(auth->client->host));
    auth_sendheader(auth->client, REPORT_FIN_DNS);
  }

  auth_release_client(auth);
}

/*
 * auth_error - handle auth send errors
 */
static void
auth_error(struct AuthRequest *auth)
{
  assert(auth);
  assert(auth->fd);
  assert(auth->client);
  assert(auth->client->connection);

  ++ServerStats.is_abad;

  fd_close(auth->fd);
  auth->fd = NULL;
  auth->ident_pending = false;

  auth_sendheader(auth->client, REPORT_FAIL_ID);

  auth_release_client(auth);
}

/** Enum used to index ident reply fields in a human-readable way. */
enum IdentReplyFields
{
  IDENT_PORT_NUMBERS,
  IDENT_REPLY_TYPE,
  IDENT_OS_TYPE,
  IDENT_INFO,
  USERID_TOKEN_COUNT
};

/** Parse an ident reply line and extract the userid from it.
 * \param reply The ident reply line.
 * \return The userid, or NULL on parse failure.
 */
static const char *
auth_check_ident_reply(char *const reply)
{
  char *token = NULL, *end = NULL;
  char *vector[USERID_TOKEN_COUNT];
  const unsigned int count = token_vector(reply, ':', vector, USERID_TOKEN_COUNT);

  if (USERID_TOKEN_COUNT != count)
    return NULL;

  /*
   * Second token is the reply type
   */
  token = vector[IDENT_REPLY_TYPE];

  if (EmptyString(token))
    return NULL;

  while (IsSpace(*token))
    ++token;

  if (strncmp(token, "USERID", 6))
    return NULL;

  /*
   * Third token is the os type
   */
  token = vector[IDENT_OS_TYPE];

  if (EmptyString(token))
    return NULL;

  while (IsSpace(*token))
   ++token;

  /*
   * Unless "OTHER" is specified as the operating system type, the server
   * is expected to return the "normal" user identification of the owner
   * of this connection. "Normal" in this context may be taken to mean a
   * string of characters which uniquely identifies the connection owner
   * such as a user identifier assigned by the system administrator and
   * used by such user as a mail identifier, or as the "user" part of a
   * user/password pair used to gain access to system resources. When an
   * operating system is specified (e.g., anything but "OTHER"), the user
   * identifier is expected to be in a more or less immediately useful
   * form - e.g., something that could be used as an argument to "finger"
   * or as a mail address.
   */
  if (strncmp(token, "OTHER", 5) == 0)
    return NULL;

  /*
   * Fourth token is the username
   */
  token = vector[IDENT_INFO];

  if (EmptyString(token))
    return NULL;

  while (IsSpace(*token))
    ++token;

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

  /*
   * Look for the end of the username, terminators are '\0, @, <SPACE>, :'
   */
  for (end = token; *end; ++end)
    if (IsSpace(*end) || '@' == *end || ':' == *end)
      break;
  *end = '\0';

  return token;
}

/*! \brief 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
 * \param F The socket/fd to read from.
 * \param data The request to read.
 */
static void
auth_read_reply(fde_t *F, void *data)
{
  struct AuthRequest *const auth = data;
  const char *username = NULL;
  ssize_t len = 0;
  char buf[RFC1413_BUFSIZ + 1];

  assert(auth->fd == F);
  assert(auth->client);
  assert(auth->client->connection);

  if ((len = recv(auth->fd->fd, buf, sizeof(buf) - 1, 0)) > 0)
  {
    buf[len] = '\0';
    username = auth_check_ident_reply(buf);
  }

  fd_close(auth->fd);
  auth->fd = NULL;
  auth->ident_pending = false;

  if (EmptyString(username))
  {
    auth_sendheader(auth->client, REPORT_FAIL_ID);
    ++ServerStats.is_abad;
  }
  else
  {
    strlcpy(auth->client->username, username, sizeof(auth->client->username));
    auth_sendheader(auth->client, REPORT_FIN_ID);
    ++ServerStats.is_asuc;
    AddFlag(auth->client, FLAGS_GOTID);
  }

  auth_release_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 *F, int error, void *data)
{
  struct AuthRequest *const auth = data;
  struct irc_ssaddr us;
  struct irc_ssaddr them;
  char authbuf[16];
  ssize_t len = 0;
  socklen_t ulen = sizeof(struct irc_ssaddr);
  socklen_t tlen = sizeof(struct irc_ssaddr);
  uint16_t uport, tport;
  struct sockaddr_in6 *v6;

  assert(auth->fd == F);
  assert(auth->client);
  assert(auth->client->connection);

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

  if (getsockname(auth->client->connection->fd->fd, (struct sockaddr *)&us, &ulen) ||
      getpeername(auth->client->connection->fd->fd, (struct sockaddr *)&them, &tlen))
  {
    report_error(L_ALL, "auth get{sock,peer}name error %s:%s",
                 client_get_name(auth->client, SHOW_IP), errno);
    auth_error(auth);
    return;
  }

  v6 = (struct sockaddr_in6 *)&us;
  uport = ntohs(v6->sin6_port);
  v6 = (struct sockaddr_in6 *)&them;
  tport = ntohs(v6->sin6_port);

  len = snprintf(authbuf, sizeof(authbuf), "%u, %u\r\n", tport, uport);

  if (send(F->fd, authbuf, len, 0) != len)
  {
    auth_error(auth);
    return;
  }

  comm_setselect(F, COMM_SELECT_READ, auth_read_reply, auth, 0);
}

/*! \brief Flag the client to show an attempt to contact the ident server on
 *         the client's host. Should the connect or any later phase of the
 *         identifying process fail, it is aborted and the user is given a
 *         username of "unknown".
 * \param auth The request for which to start the ident lookup.
 */
static void
auth_start_query(struct AuthRequest *auth)
{
  struct irc_ssaddr localaddr;
  socklen_t locallen = sizeof(struct irc_ssaddr);
  struct sockaddr_in6 *v6;

  assert(auth->client);
  assert(auth->client->connection);

  /* Open a socket of the same type as the client socket */
  int fd = comm_socket(auth->client->ip.ss.ss_family, SOCK_STREAM, 0);
  if (fd == -1)
  {
    report_error(L_ALL, "creating auth stream socket %s:%s",
                 client_get_name(auth->client, SHOW_IP), errno);
    ++ServerStats.is_abad;
    return;
  }

  auth->fd = fd_open(fd, true, "ident");
  auth->ident_pending = true;

  auth_sendheader(auth->client, REPORT_DO_ID);

  /*
   * Get the local address of the client and bind to that to
   * make the auth request.
   */
  memset(&localaddr, 0, locallen);
  getsockname(auth->client->connection->fd->fd, (struct sockaddr *)&localaddr, &locallen);

  remove_ipv6_mapping(&localaddr);
  v6 = (struct sockaddr_in6 *)&localaddr;
  v6->sin6_port = htons(0);

  comm_connect_tcp(auth->fd, &auth->client->ip, RFC1413_PORT, &localaddr,
                   auth_connect_callback, auth, 5);
}

/*
 * auth_start
 *
 * inputs       - pointer to client to auth
 * output       - NONE
 * side effects - starts auth (identd) and dns queries for a client
 */
void
auth_start(struct Client *client_p)
{
  struct AuthRequest *auth = auth_make(client_p);

  assert(client_p);
  assert(client_p->connection);

  auth_sendheader(client_p, REPORT_DO_DNS);

  auth->dns_pending = true;

  if (ConfigGeneral.disable_auth == 0)
    auth_start_query(auth);

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

/*
 * auth_delete()
 */
void
auth_delete(struct AuthRequest *auth)
{
  assert(auth->client);
  assert(auth->client->connection);

  if (auth->ident_pending == true)
  {
    fd_close(auth->fd);
    auth->fd = NULL;
    auth->ident_pending = false;
  }

  if (auth->dns_pending == true)
  {
    delete_resolver_queries(auth);
    auth->dns_pending = false;
  }

  auth_free(auth);
}
Revision:	8893
Committed:	Sun Apr 21 14:12:35 2019 UTC (6 years, 4 months ago) by michael
Content type:	text/x-csrc
File size:	13583 byte(s)
Log Message:	- auth.c: remove auth_timeout_queries() and related code. Just let the dns and identd timeouts finish the request - Removed IDENTTIMEOUT from '/set' options. We now no longer allow users to change this on runtime. identd timeout is 5 seconds now
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	8752	* Copyright (c) 1997-2019 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	michael	4565	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	adx	30	* USA
20			*/
21
22	michael	3324	/*! \file auth.c
23	michael	8306	* \brief Implementation of DNS and ident lookups.
24	michael	2916	* \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	michael	3324	#include "auth.h"
43	michael	1309	#include "conf.h"
44	adx	30	#include "client.h"
45			#include "event.h"
46			#include "irc_string.h"
47			#include "ircd.h"
48			#include "packet.h"
49	michael	3322	#include "res.h"
50	adx	30	#include "s_bsd.h"
51	michael	1309	#include "log.h"
52	adx	30	#include "send.h"
53	michael	8385	#include "memory.h"
54	michael	8881	#include "misc.h"
55	adx	30
56	michael	1011
57	michael	2916	enum
58			{
59	adx	30	REPORT_DO_DNS,
60			REPORT_FIN_DNS,
61			REPORT_FAIL_DNS,
62			REPORT_DO_ID,
63			REPORT_FIN_ID,
64			REPORT_FAIL_ID,
65			REPORT_IP_MISMATCH,
66	michael	8217	REPORT_HOST_TOOLONG,
67			REPORT_HOST_INVALID
68	adx	30	};
69
70	michael	5888	static const char *const HeaderMessages[] =
71			{
72			[REPORT_DO_DNS] = ":*** Looking up your hostname",
73			[REPORT_FIN_DNS] = ":*** Found your hostname",
74			[REPORT_FAIL_DNS] = ":*** Couldn't look up your hostname",
75			[REPORT_DO_ID] = ":*** Checking Ident",
76			[REPORT_FIN_ID] = ":*** Got Ident response",
77			[REPORT_FAIL_ID] = ":*** No Ident response",
78			[REPORT_IP_MISMATCH] = ":*** Your forward and reverse DNS do not match, ignoring hostname",
79	michael	8217	[REPORT_HOST_TOOLONG] = ":*** Your hostname is too long, ignoring hostname",
80			[REPORT_HOST_INVALID] = ":*** Your hostname contains illegal characters, ignoring hostname"
81	michael	5888	};
82
83	michael	8306	#define auth_sendheader(c, i) sendto_one_notice((c), &me, "%s", HeaderMessages[(i)])
84	adx	30
85
86	michael	4094
87	michael	8349	/*! \brief Allocate a new auth request.
88			* \param client The client being looked up.
89			* \return The newly allocated auth request.
90	adx	30	*/
91			static struct AuthRequest *
92	michael	8339	auth_make(struct Client *client)
93	adx	30	{
94	michael	8385	struct AuthRequest auth = xcalloc(sizeof(auth));
95	adx	30
96	michael	6690	auth->client = client;
97	michael	8470	auth->client->connection->auth = auth;
98	michael	2181
99	michael	6690	return auth;
100	adx	30	}
101
102	michael	8893	/*! \brief Free memory
103	michael	8470	* \param auth The allocated auth request to cleanup.
104			*/
105			static void
106			auth_free(struct AuthRequest *auth)
107			{
108	michael	8885	auth->client = NULL;
109	michael	8470	xfree(auth);
110			}
111
112	michael	8306	/*! \brief Release auth client from auth system. This adds the client into the
113			* local client lists so it can be read by the main io processing loop.
114			* \param auth Pointer to AuthRequest struct to release
115	adx	30	*/
116	michael	8304	static void
117	michael	8306	auth_release_client(struct AuthRequest *auth)
118	adx	30	{
119	michael	8470	struct Client *client = auth->client;
120	michael	992
121	michael	8813	assert(client);
122			assert(client->connection);
123
124	michael	8721	if (auth->ident_pending == true \|\| auth->dns_pending == true)
125	michael	992	return;
126
127	michael	8470	auth_free(auth);
128	michael	8339	client->connection->auth = NULL;
129
130	adx	30	/*
131			* When a client has auth'ed, we want to start reading what it sends
132			* us. This is what read_packet() does.
133			* -- adrian
134			*/
135	michael	8339	comm_setflush(client->connection->fd, 1000, flood_recalc, client);
136	michael	650
137	michael	4588	client->connection->since = CurrentTime;
138			client->connection->lasttime = CurrentTime;
139			client->connection->firsttime = CurrentTime;
140	michael	8298	AddFlag(client, FLAGS_FINISHED_AUTH);
141	michael	650
142	michael	8214	strlcpy(client->realhost, client->host, sizeof(client->realhost));
143
144	michael	8339	read_packet(client->connection->fd, client);
145	adx	30	}
146	michael	2916
147	michael	8218	/*! Checks if a hostname is valid and doesn't contain illegal characters
148			* \param hostname The string to verify
149			* \return 1 if it is valid, 0 if it isn't
150			*/
151	michael	8656	static bool
152	michael	8217	auth_verify_hostname(const char *hostname)
153			{
154			const char *p = hostname;
155
156			assert(p);
157
158			if (EmptyString(p) \|\| p == '.' \|\| p == ':')
159	michael	8656	return false;
160	michael	8217
161			for (; *p; ++p)
162			if (!IsHostChar(*p))
163	michael	8656	return false;
164	michael	8217
165	michael	8656	return true;
166	michael	8217	}
167
168	michael	8306	/*! \brief Handle a complete DNS lookup. Send the client on its way to a connection
169			* completion, regardless of success or failure.
170			* \param vptr The pending struct AuthRequest.
171			* \param addr IP address being resolved.
172			* \param name Resolved name, or NULL if lookup failed.
173			* \param namelength String length of the resolved hostname pointed by 'name'
174	adx	30	*/
175			static void
176	michael	4408	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name, size_t namelength)
177	adx	30	{
178	michael	4854	struct AuthRequest *const auth = vptr;
179	adx	30
180	michael	8813	assert(auth->client);
181			assert(auth->client->connection);
182
183	michael	8721	auth->dns_pending = false;
184	adx	30
185	michael	8886	if (namelength == 0)
186	michael	8431	auth_sendheader(auth->client, REPORT_FAIL_DNS);
187	michael	8883	else if (address_compare(addr, &auth->client->ip, false) == false)
188			auth_sendheader(auth->client, REPORT_IP_MISMATCH);
189			else if (namelength > HOSTLEN)
190			auth_sendheader(auth->client, REPORT_HOST_TOOLONG);
191			else if (auth_verify_hostname(name) == false)
192			auth_sendheader(auth->client, REPORT_HOST_INVALID);
193	michael	8431	else
194	adx	30	{
195	michael	8883	strlcpy(auth->client->host, name, sizeof(auth->client->host));
196			auth_sendheader(auth->client, REPORT_FIN_DNS);
197	adx	30	}
198
199	michael	8306	auth_release_client(auth);
200	adx	30	}
201
202			/*
203	michael	8306	* auth_error - handle auth send errors
204	adx	30	*/
205			static void
206			auth_error(struct AuthRequest *auth)
207			{
208	michael	8524	assert(auth);
209			assert(auth->fd);
210	michael	8813	assert(auth->client);
211			assert(auth->client->connection);
212	michael	8524
213	michael	896	++ServerStats.is_abad;
214	adx	30
215	michael	8339	fd_close(auth->fd);
216			auth->fd = NULL;
217	michael	8721	auth->ident_pending = false;
218	michael	8339
219	michael	8306	auth_sendheader(auth->client, REPORT_FAIL_ID);
220	adx	30
221	michael	8306	auth_release_client(auth);
222	adx	30	}
223
224	michael	4309	/** Enum used to index ident reply fields in a human-readable way. */
225			enum IdentReplyFields
226			{
227			IDENT_PORT_NUMBERS,
228			IDENT_REPLY_TYPE,
229			IDENT_OS_TYPE,
230			IDENT_INFO,
231			USERID_TOKEN_COUNT
232			};
233
234			/** Parse an ident reply line and extract the userid from it.
235			* \param reply The ident reply line.
236			* \return The userid, or NULL on parse failure.
237			*/
238			static const char *
239	michael	8306	auth_check_ident_reply(char *const reply)
240	michael	4309	{
241			char token = NULL, end = NULL;
242			char *vector[USERID_TOKEN_COUNT];
243	michael	7584	const unsigned int count = token_vector(reply, ':', vector, USERID_TOKEN_COUNT);
244	michael	4309
245			if (USERID_TOKEN_COUNT != count)
246			return NULL;
247
248			/*
249			* Second token is the reply type
250			*/
251			token = vector[IDENT_REPLY_TYPE];
252
253			if (EmptyString(token))
254			return NULL;
255
256			while (IsSpace(*token))
257			++token;
258
259			if (strncmp(token, "USERID", 6))
260			return NULL;
261
262			/*
263			* Third token is the os type
264			*/
265			token = vector[IDENT_OS_TYPE];
266
267			if (EmptyString(token))
268			return NULL;
269
270			while (IsSpace(*token))
271			++token;
272
273			/*
274			* Unless "OTHER" is specified as the operating system type, the server
275			* is expected to return the "normal" user identification of the owner
276			* of this connection. "Normal" in this context may be taken to mean a
277			* string of characters which uniquely identifies the connection owner
278			* such as a user identifier assigned by the system administrator and
279			* used by such user as a mail identifier, or as the "user" part of a
280			* user/password pair used to gain access to system resources. When an
281			* operating system is specified (e.g., anything but "OTHER"), the user
282			* identifier is expected to be in a more or less immediately useful
283			* form - e.g., something that could be used as an argument to "finger"
284			* or as a mail address.
285			*/
286	michael	8620	if (strncmp(token, "OTHER", 5) == 0)
287	michael	4309	return NULL;
288
289			/*
290			* Fourth token is the username
291			*/
292			token = vector[IDENT_INFO];
293
294			if (EmptyString(token))
295			return NULL;
296
297			while (IsSpace(*token))
298			++token;
299
300			while (token == '~' \|\| token == '^')
301			++token;
302
303			/*
304			* Look for the end of the username, terminators are '\0, @, <SPACE>, :'
305			*/
306			for (end = token; *end; ++end)
307			if (IsSpace(end) \|\| '@' == end \|\| ':' == *end)
308			break;
309			*end = '\0';
310
311			return token;
312			}
313
314	michael	8306	/*! \brief Read the reply (if any) from the ident server we connected to. We
315			* only give it one shot, if the reply isn't good the first time fail
316			* the authentication entirely. --Bleep
317	michael	8349	* \param F The socket/fd to read from.
318	michael	8306	* \param data The request to read.
319	adx	30	*/
320			static void
321	michael	8349	auth_read_reply(fde_t F, void data)
322	adx	30	{
323	michael	4854	struct AuthRequest *const auth = data;
324	michael	4309	const char *username = NULL;
325			ssize_t len = 0;
326			char buf[RFC1413_BUFSIZ + 1];
327	adx	30
328	michael	8349	assert(auth->fd == F);
329	michael	8813	assert(auth->client);
330			assert(auth->client->connection);
331	michael	8339
332	michael	8819	if ((len = recv(auth->fd->fd, buf, sizeof(buf) - 1, 0)) > 0)
333	adx	30	{
334			buf[len] = '\0';
335	michael	8306	username = auth_check_ident_reply(buf);
336	adx	30	}
337
338	michael	8339	fd_close(auth->fd);
339			auth->fd = NULL;
340	michael	8721	auth->ident_pending = false;
341	michael	8339
342	michael	4309	if (EmptyString(username))
343	adx	30	{
344	michael	8306	auth_sendheader(auth->client, REPORT_FAIL_ID);
345	michael	896	++ServerStats.is_abad;
346	adx	30	}
347			else
348			{
349	michael	4309	strlcpy(auth->client->username, username, sizeof(auth->client->username));
350	michael	8306	auth_sendheader(auth->client, REPORT_FIN_ID);
351	michael	896	++ServerStats.is_asuc;
352	michael	6313	AddFlag(auth->client, FLAGS_GOTID);
353	adx	30	}
354
355	michael	8306	auth_release_client(auth);
356	adx	30	}
357
358			/*
359	michael	8306	* auth_connect_callback() - deal with the result of comm_connect_tcp()
360			*
361			* If the connection failed, we simply close the auth fd and report
362			* a failure. If the connection suceeded send the ident server a query
363			* giving "theirport , ourport". The write is only attempted once so
364			* it is deemed to be a fail if the entire write doesn't write all the
365			* data given. This shouldnt be a problem since the socket should have
366			* a write buffer far greater than this message to store it in should
367			* problems arise. -avalon
368			*/
369			static void
370	michael	8349	auth_connect_callback(fde_t F, int error, void data)
371	michael	8306	{
372			struct AuthRequest *const auth = data;
373			struct irc_ssaddr us;
374			struct irc_ssaddr them;
375			char authbuf[16];
376			ssize_t len = 0;
377			socklen_t ulen = sizeof(struct irc_ssaddr);
378			socklen_t tlen = sizeof(struct irc_ssaddr);
379			uint16_t uport, tport;
380			struct sockaddr_in6 *v6;
381
382	michael	8813	assert(auth->fd == F);
383			assert(auth->client);
384			assert(auth->client->connection);
385
386	michael	8306	if (error != COMM_OK)
387			{
388			auth_error(auth);
389			return;
390			}
391
392	michael	8339	if (getsockname(auth->client->connection->fd->fd, (struct sockaddr *)&us, &ulen) \|\|
393			getpeername(auth->client->connection->fd->fd, (struct sockaddr *)&them, &tlen))
394	michael	8306	{
395			report_error(L_ALL, "auth get{sock,peer}name error %s:%s",
396			client_get_name(auth->client, SHOW_IP), errno);
397			auth_error(auth);
398			return;
399			}
400
401			v6 = (struct sockaddr_in6 *)&us;
402			uport = ntohs(v6->sin6_port);
403			v6 = (struct sockaddr_in6 *)&them;
404			tport = ntohs(v6->sin6_port);
405
406			len = snprintf(authbuf, sizeof(authbuf), "%u, %u\r\n", tport, uport);
407
408	michael	8349	if (send(F->fd, authbuf, len, 0) != len)
409	michael	8306	{
410			auth_error(auth);
411			return;
412			}
413
414	michael	8349	comm_setselect(F, COMM_SELECT_READ, auth_read_reply, auth, 0);
415	michael	8306	}
416
417			/*! \brief Flag the client to show an attempt to contact the ident server on
418			* the client's host. Should the connect or any later phase of the
419			* identifying process fail, it is aborted and the user is given a
420			* username of "unknown".
421			* \param auth The request for which to start the ident lookup.
422			*/
423			static void
424			auth_start_query(struct AuthRequest *auth)
425			{
426			struct irc_ssaddr localaddr;
427			socklen_t locallen = sizeof(struct irc_ssaddr);
428			struct sockaddr_in6 *v6;
429
430	michael	8813	assert(auth->client);
431			assert(auth->client->connection);
432
433	michael	8306	/* Open a socket of the same type as the client socket */
434	michael	8496	int fd = comm_socket(auth->client->ip.ss.ss_family, SOCK_STREAM, 0);
435	michael	8339	if (fd == -1)
436	michael	8306	{
437			report_error(L_ALL, "creating auth stream socket %s:%s",
438			client_get_name(auth->client, SHOW_IP), errno);
439			++ServerStats.is_abad;
440			return;
441			}
442
443	michael	8658	auth->fd = fd_open(fd, true, "ident");
444	michael	8721	auth->ident_pending = true;
445	michael	8339
446	michael	8306	auth_sendheader(auth->client, REPORT_DO_ID);
447
448			/*
449			* Get the local address of the client and bind to that to
450			* make the auth request.
451			*/
452			memset(&localaddr, 0, locallen);
453	michael	8339	getsockname(auth->client->connection->fd->fd, (struct sockaddr *)&localaddr, &locallen);
454	michael	8306
455			remove_ipv6_mapping(&localaddr);
456			v6 = (struct sockaddr_in6 *)&localaddr;
457			v6->sin6_port = htons(0);
458
459	michael	8893	comm_connect_tcp(auth->fd, &auth->client->ip, RFC1413_PORT, &localaddr,
460			auth_connect_callback, auth, 5);
461	michael	8306	}
462
463			/*
464			* auth_start
465			*
466			* inputs - pointer to client to auth
467			* output - NONE
468			* side effects - starts auth (identd) and dns queries for a client
469			*/
470			void
471			auth_start(struct Client *client_p)
472			{
473	michael	8339	struct AuthRequest *auth = auth_make(client_p);
474	michael	8306
475	michael	8813	assert(client_p);
476			assert(client_p->connection);
477
478	michael	8306	auth_sendheader(client_p, REPORT_DO_DNS);
479
480	michael	8721	auth->dns_pending = true;
481	michael	8306
482			if (ConfigGeneral.disable_auth == 0)
483			auth_start_query(auth);
484
485	michael	8496	gethost_byaddr(auth_dns_callback, auth, &client_p->ip);
486	michael	8306	}
487
488			/*
489	michael	7955	* auth_delete()
490	adx	30	*/
491	michael	2916	void
492	michael	7955	auth_delete(struct AuthRequest *auth)
493	adx	30	{
494	michael	8813	assert(auth->client);
495			assert(auth->client->connection);
496
497	michael	8721	if (auth->ident_pending == true)
498	michael	8306	{
499	michael	8339	fd_close(auth->fd);
500			auth->fd = NULL;
501	michael	8721	auth->ident_pending = false;
502	michael	8306	}
503
504	michael	8721	if (auth->dns_pending == true)
505	michael	8300	{
506	michael	992	delete_resolver_queries(auth);
507	michael	8721	auth->dns_pending = false;
508	michael	8300	}
509	adx	30
510	michael	8470	auth_free(auth);
511	adx	30	}