8.2.x/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);
}
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 1997-2019 ircd-hybrid development team
5	*
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	* USA
20	*/
21
22	/*! \file auth.c
23	* \brief Implementation of DNS and ident lookups.
24	* \version $Id$
25	*/
26
27	/*
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
38	#include "stdinc.h"
39	#include "list.h"
40	#include "ircd_defs.h"
41	#include "fdlist.h"
42	#include "auth.h"
43	#include "conf.h"
44	#include "client.h"
45	#include "event.h"
46	#include "irc_string.h"
47	#include "ircd.h"
48	#include "packet.h"
49	#include "res.h"
50	#include "s_bsd.h"
51	#include "log.h"
52	#include "send.h"
53	#include "memory.h"
54	#include "misc.h"
55
56
57	enum
58	{
59	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	REPORT_HOST_TOOLONG,
67	REPORT_HOST_INVALID
68	};
69
70	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	[REPORT_HOST_TOOLONG] = ":*** Your hostname is too long, ignoring hostname",
80	[REPORT_HOST_INVALID] = ":*** Your hostname contains illegal characters, ignoring hostname"
81	};
82
83	#define auth_sendheader(c, i) sendto_one_notice((c), &me, "%s", HeaderMessages[(i)])
84
85
86
87	/*! \brief Allocate a new auth request.
88	* \param client The client being looked up.
89	* \return The newly allocated auth request.
90	*/
91	static struct AuthRequest *
92	auth_make(struct Client *client)
93	{
94	struct AuthRequest auth = xcalloc(sizeof(auth));
95
96	auth->client = client;
97	auth->client->connection->auth = auth;
98
99	return auth;
100	}
101
102	/*! \brief Free memory
103	* \param auth The allocated auth request to cleanup.
104	*/
105	static void
106	auth_free(struct AuthRequest *auth)
107	{
108	auth->client = NULL;
109	xfree(auth);
110	}
111
112	/*! \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	*/
116	static void
117	auth_release_client(struct AuthRequest *auth)
118	{
119	struct Client *client = auth->client;
120
121	assert(client);
122	assert(client->connection);
123
124	if (auth->ident_pending == true \|\| auth->dns_pending == true)
125	return;
126
127	auth_free(auth);
128	client->connection->auth = NULL;
129
130	/*
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	comm_setflush(client->connection->fd, 1000, flood_recalc, client);
136
137	client->connection->since = CurrentTime;
138	client->connection->lasttime = CurrentTime;
139	client->connection->firsttime = CurrentTime;
140	AddFlag(client, FLAGS_FINISHED_AUTH);
141
142	strlcpy(client->realhost, client->host, sizeof(client->realhost));
143
144	read_packet(client->connection->fd, client);
145	}
146
147	/*! 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	static bool
152	auth_verify_hostname(const char *hostname)
153	{
154	const char *p = hostname;
155
156	assert(p);
157
158	if (EmptyString(p) \|\| p == '.' \|\| p == ':')
159	return false;
160
161	for (; *p; ++p)
162	if (!IsHostChar(*p))
163	return false;
164
165	return true;
166	}
167
168	/*! \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	*/
175	static void
176	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name, size_t namelength)
177	{
178	struct AuthRequest *const auth = vptr;
179
180	assert(auth->client);
181	assert(auth->client->connection);
182
183	auth->dns_pending = false;
184
185	if (namelength == 0)
186	auth_sendheader(auth->client, REPORT_FAIL_DNS);
187	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	else
194	{
195	strlcpy(auth->client->host, name, sizeof(auth->client->host));
196	auth_sendheader(auth->client, REPORT_FIN_DNS);
197	}
198
199	auth_release_client(auth);
200	}
201
202	/*
203	* auth_error - handle auth send errors
204	*/
205	static void
206	auth_error(struct AuthRequest *auth)
207	{
208	assert(auth);
209	assert(auth->fd);
210	assert(auth->client);
211	assert(auth->client->connection);
212
213	++ServerStats.is_abad;
214
215	fd_close(auth->fd);
216	auth->fd = NULL;
217	auth->ident_pending = false;
218
219	auth_sendheader(auth->client, REPORT_FAIL_ID);
220
221	auth_release_client(auth);
222	}
223
224	/** 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	auth_check_ident_reply(char *const reply)
240	{
241	char token = NULL, end = NULL;
242	char *vector[USERID_TOKEN_COUNT];
243	const unsigned int count = token_vector(reply, ':', vector, USERID_TOKEN_COUNT);
244
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	if (strncmp(token, "OTHER", 5) == 0)
287	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	/*! \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	* \param F The socket/fd to read from.
318	* \param data The request to read.
319	*/
320	static void
321	auth_read_reply(fde_t F, void data)
322	{
323	struct AuthRequest *const auth = data;
324	const char *username = NULL;
325	ssize_t len = 0;
326	char buf[RFC1413_BUFSIZ + 1];
327
328	assert(auth->fd == F);
329	assert(auth->client);
330	assert(auth->client->connection);
331
332	if ((len = recv(auth->fd->fd, buf, sizeof(buf) - 1, 0)) > 0)
333	{
334	buf[len] = '\0';
335	username = auth_check_ident_reply(buf);
336	}
337
338	fd_close(auth->fd);
339	auth->fd = NULL;
340	auth->ident_pending = false;
341
342	if (EmptyString(username))
343	{
344	auth_sendheader(auth->client, REPORT_FAIL_ID);
345	++ServerStats.is_abad;
346	}
347	else
348	{
349	strlcpy(auth->client->username, username, sizeof(auth->client->username));
350	auth_sendheader(auth->client, REPORT_FIN_ID);
351	++ServerStats.is_asuc;
352	AddFlag(auth->client, FLAGS_GOTID);
353	}
354
355	auth_release_client(auth);
356	}
357
358	/*
359	* 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	auth_connect_callback(fde_t F, int error, void data)
371	{
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	assert(auth->fd == F);
383	assert(auth->client);
384	assert(auth->client->connection);
385
386	if (error != COMM_OK)
387	{
388	auth_error(auth);
389	return;
390	}
391
392	if (getsockname(auth->client->connection->fd->fd, (struct sockaddr *)&us, &ulen) \|\|
393	getpeername(auth->client->connection->fd->fd, (struct sockaddr *)&them, &tlen))
394	{
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	if (send(F->fd, authbuf, len, 0) != len)
409	{
410	auth_error(auth);
411	return;
412	}
413
414	comm_setselect(F, COMM_SELECT_READ, auth_read_reply, auth, 0);
415	}
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	assert(auth->client);
431	assert(auth->client->connection);
432
433	/* Open a socket of the same type as the client socket */
434	int fd = comm_socket(auth->client->ip.ss.ss_family, SOCK_STREAM, 0);
435	if (fd == -1)
436	{
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	auth->fd = fd_open(fd, true, "ident");
444	auth->ident_pending = true;
445
446	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	getsockname(auth->client->connection->fd->fd, (struct sockaddr *)&localaddr, &locallen);
454
455	remove_ipv6_mapping(&localaddr);
456	v6 = (struct sockaddr_in6 *)&localaddr;
457	v6->sin6_port = htons(0);
458
459	comm_connect_tcp(auth->fd, &auth->client->ip, RFC1413_PORT, &localaddr,
460	auth_connect_callback, auth, 5);
461	}
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	struct AuthRequest *auth = auth_make(client_p);
474
475	assert(client_p);
476	assert(client_p->connection);
477
478	auth_sendheader(client_p, REPORT_DO_DNS);
479
480	auth->dns_pending = true;
481
482	if (ConfigGeneral.disable_auth == 0)
483	auth_start_query(auth);
484
485	gethost_byaddr(auth_dns_callback, auth, &client_p->ip);
486	}
487
488	/*
489	* auth_delete()
490	*/
491	void
492	auth_delete(struct AuthRequest *auth)
493	{
494	assert(auth->client);
495	assert(auth->client->connection);
496
497	if (auth->ident_pending == true)
498	{
499	fd_close(auth->fd);
500	auth->fd = NULL;
501	auth->ident_pending = false;
502	}
503
504	if (auth->dns_pending == true)
505	{
506	delete_resolver_queries(auth);
507	auth->dns_pending = false;
508	}
509
510	auth_free(auth);
511	}
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