trunk/src/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 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 "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 "mempool.h"


static const char *const HeaderMessages[] =
{
  ":*** Looking up your hostname",
  ":*** Found your hostname",
  ":*** Couldn't look up your hostname",
  ":*** Checking Ident",
  ":*** Got Ident response",
  ":*** No Ident response",
  ":*** Your forward and reverse DNS do not match, ignoring hostname",
  ":*** 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_notice((c), &me, HeaderMessages[(i)])

static dlink_list auth_pending_list;
static PF read_auth_reply;
static CNCB auth_connect_callback;


/*
 * 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_pending_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);

  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, size_t namelength)
{
  struct AuthRequest *auth = vptr;

  ClearDNSPending(auth);

  if (!EmptyString(name))
  {
    const struct sockaddr_in *v4, *v4dns;
#ifdef IPV6
    const struct sockaddr_in6 *v6, *v6dns;

    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);
        release_auth_client(auth);
        return;
      }
    }
    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);
        release_auth_client(auth);
        return;
      }
    }

    if (namelength > HOSTLEN)
      sendheader(auth->client, REPORT_HOST_TOOLONG);
    else
    {
      strlcpy(auth->client->host, name, sizeof(auth->client->host));
      sendheader(auth->client, REPORT_FIN_DNS);
    }
  }
  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, RFC1413_PORT,
      (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 */
}

/*
 * 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_p)
{
  struct AuthRequest *auth = NULL;

  assert(client_p);

  auth = make_auth_request(client_p);
  SetInAuth(auth);
  dlinkAddTail(auth, &auth->node, &auth_pending_list);

  sendheader(client_p, REPORT_DO_DNS);

  SetDNSPending(auth);

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

  gethost_byaddr(auth_dns_callback, auth, &client_p->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, *ptr_next = NULL;

  DLINK_FOREACH_SAFE(ptr, ptr_next, auth_pending_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;
  }

  comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
}

/** 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 *
check_ident_reply(char *reply)
{
  char *token = NULL, *end = NULL;
  char *vector[USERID_TOKEN_COUNT];
  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))
    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;
}

/*
 * 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
 */
static void
read_auth_reply(fde_t *fd, void *data)
{
  struct AuthRequest *auth = data;
  const char *username = NULL;
  ssize_t len = 0;
  char buf[RFC1413_BUFSIZ + 1];

  if ((len = recv(fd->fd, buf, RFC1413_BUFSIZ, 0)) > 0)
  {
    buf[len] = '\0';
    username = check_ident_reply(buf);
  }

  fd_close(fd);

  ClearAuth(auth);

  if (EmptyString(username))
  {
    sendheader(auth->client, REPORT_FAIL_ID);
    ++ServerStats.is_abad;
  }
  else
  {
    strlcpy(auth->client->username, username, sizeof(auth->client->username));
    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_pending_list);
    ClearInAuth(auth);
  }
}

/* auth_init
 *
 * Initialise the auth code
 */
void
auth_init(void)
{
  static struct event timeout_auth_queries =
  {
    .name = "timeout_auth_queries_event",
    .handler = timeout_auth_queries_event,
    .when = 1
  };

  event_add(&timeout_auth_queries, NULL);
}
Revision:	4408
Committed:	Wed Aug 6 21:19:38 2014 UTC (11 years ago) by michael
Content type:	text/x-csrc
File size:	14655 byte(s)
Log Message:	- Fixed resolver/auth issues with too long hostnames
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 1997-2014 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19	* USA
20	*/
21
22	/*! \file auth.c
23	* \brief Functions for querying a users ident.
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 "mempool.h"
54
55
56	static const char *const HeaderMessages[] =
57	{
58	":*** Looking up your hostname",
59	":*** Found your hostname",
60	":*** Couldn't look up your hostname",
61	":*** Checking Ident",
62	":*** Got Ident response",
63	":*** No Ident response",
64	":*** Your forward and reverse DNS do not match, ignoring hostname",
65	":*** Your hostname is too long, ignoring hostname"
66	};
67
68	enum
69	{
70	REPORT_DO_DNS,
71	REPORT_FIN_DNS,
72	REPORT_FAIL_DNS,
73	REPORT_DO_ID,
74	REPORT_FIN_ID,
75	REPORT_FAIL_ID,
76	REPORT_IP_MISMATCH,
77	REPORT_HOST_TOOLONG
78	};
79
80	#define sendheader(c, i) sendto_one_notice((c), &me, HeaderMessages[(i)])
81
82	static dlink_list auth_pending_list;
83	static PF read_auth_reply;
84	static CNCB auth_connect_callback;
85
86
87	/*
88	* make_auth_request - allocate a new auth request
89	*/
90	static struct AuthRequest *
91	make_auth_request(struct Client *client)
92	{
93	struct AuthRequest *request = &client->localClient->auth;
94
95	memset(request, 0, sizeof(*request));
96
97	request->client = client;
98	request->timeout = CurrentTime + CONNECTTIMEOUT;
99
100	return request;
101	}
102
103	/*
104	* release_auth_client - release auth client from auth system
105	* this adds the client into the local client lists so it can be read by
106	* the main io processing loop
107	*/
108	void
109	release_auth_client(struct AuthRequest *auth)
110	{
111	struct Client *client = auth->client;
112
113	if (IsDoingAuth(auth) \|\| IsDNSPending(auth))
114	return;
115
116	if (IsInAuth(auth))
117	{
118	dlinkDelete(&auth->node, &auth_pending_list);
119	ClearInAuth(auth);
120	}
121
122	/*
123	* When a client has auth'ed, we want to start reading what it sends
124	* us. This is what read_packet() does.
125	* -- adrian
126	*/
127	client->localClient->allow_read = MAX_FLOOD;
128	comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
129
130	client->localClient->since = CurrentTime;
131	client->localClient->lasttime = CurrentTime;
132	client->localClient->firsttime = CurrentTime;
133	client->flags \|= FLAGS_FINISHED_AUTH;
134
135	read_packet(&client->localClient->fd, client);
136	}
137
138	/*
139	* auth_dns_callback - called when resolver query finishes
140	* if the query resulted in a successful search, name will contain
141	* a non-NULL pointer, otherwise name will be NULL.
142	* set the client on it's way to a connection completion, regardless
143	* of success of failure
144	*/
145	static void
146	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name, size_t namelength)
147	{
148	struct AuthRequest *auth = vptr;
149
150	ClearDNSPending(auth);
151
152	if (!EmptyString(name))
153	{
154	const struct sockaddr_in v4, v4dns;
155	#ifdef IPV6
156	const struct sockaddr_in6 v6, v6dns;
157
158	if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
159	{
160	v6 = (const struct sockaddr_in6 *)&auth->client->localClient->ip;
161	v6dns = (const struct sockaddr_in6 *)addr;
162
163	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
164	{
165	sendheader(auth->client, REPORT_IP_MISMATCH);
166	release_auth_client(auth);
167	return;
168	}
169	}
170	else
171	#endif
172	{
173	v4 = (const struct sockaddr_in *)&auth->client->localClient->ip;
174	v4dns = (const struct sockaddr_in *)addr;
175
176	if (v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
177	{
178	sendheader(auth->client, REPORT_IP_MISMATCH);
179	release_auth_client(auth);
180	return;
181	}
182	}
183
184	if (namelength > HOSTLEN)
185	sendheader(auth->client, REPORT_HOST_TOOLONG);
186	else
187	{
188	strlcpy(auth->client->host, name, sizeof(auth->client->host));
189	sendheader(auth->client, REPORT_FIN_DNS);
190	}
191	}
192	else
193	sendheader(auth->client, REPORT_FAIL_DNS);
194
195	release_auth_client(auth);
196	}
197
198	/*
199	* authsenderr - handle auth send errors
200	*/
201	static void
202	auth_error(struct AuthRequest *auth)
203	{
204	++ServerStats.is_abad;
205
206	fd_close(&auth->fd);
207
208	ClearAuth(auth);
209
210	sendheader(auth->client, REPORT_FAIL_ID);
211
212	release_auth_client(auth);
213	}
214
215	/*
216	* start_auth_query - Flag the client to show that an attempt to
217	* contact the ident server on
218	* the client's host. The connect and subsequently the socket are all put
219	* into 'non-blocking' mode. Should the connect or any later phase of the
220	* identifing process fail, it is aborted and the user is given a username
221	* of "unknown".
222	*/
223	static int
224	start_auth_query(struct AuthRequest *auth)
225	{
226	struct irc_ssaddr localaddr;
227	socklen_t locallen = sizeof(struct irc_ssaddr);
228	#ifdef IPV6
229	struct sockaddr_in6 *v6;
230	#else
231	struct sockaddr_in *v4;
232	#endif
233
234	/* open a socket of the same type as the client socket */
235	if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
236	SOCK_STREAM, 0, "ident") == -1)
237	{
238	report_error(L_ALL, "creating auth stream socket %s:%s",
239	get_client_name(auth->client, SHOW_IP), errno);
240	ilog(LOG_TYPE_IRCD, "Unable to create auth socket for %s",
241	get_client_name(auth->client, SHOW_IP));
242	++ServerStats.is_abad;
243	return 0;
244	}
245
246	sendheader(auth->client, REPORT_DO_ID);
247
248	/*
249	* get the local address of the client and bind to that to
250	* make the auth request. This used to be done only for
251	* ifdef VIRTUAL_HOST, but needs to be done for all clients
252	* since the ident request must originate from that same address--
253	* and machines with multiple IP addresses are common now
254	*/
255	memset(&localaddr, 0, locallen);
256	getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
257	&locallen);
258
259	#ifdef IPV6
260	remove_ipv6_mapping(&localaddr);
261	v6 = (struct sockaddr_in6 *)&localaddr;
262	v6->sin6_port = htons(0);
263	#else
264	localaddr.ss_len = locallen;
265	v4 = (struct sockaddr_in *)&localaddr;
266	v4->sin_port = htons(0);
267	#endif
268	localaddr.ss_port = htons(0);
269
270	comm_connect_tcp(&auth->fd, auth->client->sockhost, RFC1413_PORT,
271	(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
272	auth, auth->client->localClient->ip.ss.ss_family,
273	GlobalSetOptions.ident_timeout);
274	return 1; /* We suceed here for now */
275	}
276
277	/*
278	* start_auth
279	*
280	* inputs - pointer to client to auth
281	* output - NONE
282	* side effects - starts auth (identd) and dns queries for a client
283	*/
284	void
285	start_auth(struct Client *client_p)
286	{
287	struct AuthRequest *auth = NULL;
288
289	assert(client_p);
290
291	auth = make_auth_request(client_p);
292	SetInAuth(auth);
293	dlinkAddTail(auth, &auth->node, &auth_pending_list);
294
295	sendheader(client_p, REPORT_DO_DNS);
296
297	SetDNSPending(auth);
298
299	if (ConfigGeneral.disable_auth == 0)
300	{
301	SetDoingAuth(auth);
302	start_auth_query(auth);
303	}
304
305	gethost_byaddr(auth_dns_callback, auth, &client_p->localClient->ip);
306	}
307
308	/*
309	* timeout_auth_queries - timeout resolver and identd requests
310	* allow clients through if requests failed
311	*/
312	static void
313	timeout_auth_queries_event(void *notused)
314	{
315	dlink_node ptr = NULL, ptr_next = NULL;
316
317	DLINK_FOREACH_SAFE(ptr, ptr_next, auth_pending_list.head)
318	{
319	struct AuthRequest *auth = ptr->data;
320
321	if (auth->timeout > CurrentTime)
322	break;
323
324	if (IsDoingAuth(auth))
325	{
326	++ServerStats.is_abad;
327	fd_close(&auth->fd);
328	ClearAuth(auth);
329	sendheader(auth->client, REPORT_FAIL_ID);
330	}
331
332	if (IsDNSPending(auth))
333	{
334	delete_resolver_queries(auth);
335	ClearDNSPending(auth);
336	sendheader(auth->client, REPORT_FAIL_DNS);
337	}
338
339	ilog(LOG_TYPE_IRCD, "DNS/AUTH timeout %s",
340	get_client_name(auth->client, SHOW_IP));
341	release_auth_client(auth);
342	}
343	}
344
345	/*
346	* auth_connect_callback() - deal with the result of comm_connect_tcp()
347	*
348	* If the connection failed, we simply close the auth fd and report
349	* a failure. If the connection suceeded send the ident server a query
350	* giving "theirport , ourport". The write is only attempted once so
351	* it is deemed to be a fail if the entire write doesn't write all the
352	* data given. This shouldnt be a problem since the socket should have
353	* a write buffer far greater than this message to store it in should
354	* problems arise. -avalon
355	*/
356	static void
357	auth_connect_callback(fde_t fd, int error, void data)
358	{
359	struct AuthRequest *auth = data;
360	struct irc_ssaddr us;
361	struct irc_ssaddr them;
362	char authbuf[32];
363	socklen_t ulen = sizeof(struct irc_ssaddr);
364	socklen_t tlen = sizeof(struct irc_ssaddr);
365	uint16_t uport, tport;
366	#ifdef IPV6
367	struct sockaddr_in6 *v6;
368	#else
369	struct sockaddr_in *v4;
370	#endif
371
372	if (error != COMM_OK)
373	{
374	auth_error(auth);
375	return;
376	}
377
378	if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *)&us, &ulen) \|\|
379	getpeername(auth->client->localClient->fd.fd, (struct sockaddr *)&them, &tlen))
380	{
381	ilog(LOG_TYPE_IRCD, "auth get{sock,peer}name error for %s",
382	get_client_name(auth->client, SHOW_IP));
383	auth_error(auth);
384	return;
385	}
386
387	#ifdef IPV6
388	v6 = (struct sockaddr_in6 *)&us;
389	uport = ntohs(v6->sin6_port);
390	v6 = (struct sockaddr_in6 *)&them;
391	tport = ntohs(v6->sin6_port);
392	remove_ipv6_mapping(&us);
393	remove_ipv6_mapping(&them);
394	#else
395	v4 = (struct sockaddr_in *)&us;
396	uport = ntohs(v4->sin_port);
397	v4 = (struct sockaddr_in *)&them;
398	tport = ntohs(v4->sin_port);
399	us.ss_len = ulen;
400	them.ss_len = tlen;
401	#endif
402
403	snprintf(authbuf, sizeof(authbuf), "%u, %u\r\n", tport, uport);
404
405	if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
406	{
407	auth_error(auth);
408	return;
409	}
410
411	comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
412	}
413
414	/** Enum used to index ident reply fields in a human-readable way. */
415	enum IdentReplyFields
416	{
417	IDENT_PORT_NUMBERS,
418	IDENT_REPLY_TYPE,
419	IDENT_OS_TYPE,
420	IDENT_INFO,
421	USERID_TOKEN_COUNT
422	};
423
424	/** Parse an ident reply line and extract the userid from it.
425	* \param reply The ident reply line.
426	* \return The userid, or NULL on parse failure.
427	*/
428	static const char *
429	check_ident_reply(char *reply)
430	{
431	char token = NULL, end = NULL;
432	char *vector[USERID_TOKEN_COUNT];
433	int count = token_vector(reply, ':', vector, USERID_TOKEN_COUNT);
434
435	if (USERID_TOKEN_COUNT != count)
436	return NULL;
437
438	/*
439	* Second token is the reply type
440	*/
441	token = vector[IDENT_REPLY_TYPE];
442
443	if (EmptyString(token))
444	return NULL;
445
446	while (IsSpace(*token))
447	++token;
448
449	if (strncmp(token, "USERID", 6))
450	return NULL;
451
452	/*
453	* Third token is the os type
454	*/
455	token = vector[IDENT_OS_TYPE];
456
457	if (EmptyString(token))
458	return NULL;
459
460	while (IsSpace(*token))
461	++token;
462
463	/*
464	* Unless "OTHER" is specified as the operating system type, the server
465	* is expected to return the "normal" user identification of the owner
466	* of this connection. "Normal" in this context may be taken to mean a
467	* string of characters which uniquely identifies the connection owner
468	* such as a user identifier assigned by the system administrator and
469	* used by such user as a mail identifier, or as the "user" part of a
470	* user/password pair used to gain access to system resources. When an
471	* operating system is specified (e.g., anything but "OTHER"), the user
472	* identifier is expected to be in a more or less immediately useful
473	* form - e.g., something that could be used as an argument to "finger"
474	* or as a mail address.
475	*/
476	if (!strncmp(token, "OTHER", 5))
477	return NULL;
478
479	/*
480	* Fourth token is the username
481	*/
482	token = vector[IDENT_INFO];
483
484	if (EmptyString(token))
485	return NULL;
486
487	while (IsSpace(*token))
488	++token;
489
490	while (token == '~' \|\| token == '^')
491	++token;
492
493	/*
494	* Look for the end of the username, terminators are '\0, @, <SPACE>, :'
495	*/
496	for (end = token; *end; ++end)
497	if (IsSpace(end) \|\| '@' == end \|\| ':' == *end)
498	break;
499	*end = '\0';
500
501	return token;
502	}
503
504	/*
505	* read_auth_reply - read the reply (if any) from the ident server
506	* we connected to.
507	* We only give it one shot, if the reply isn't good the first time
508	* fail the authentication entirely. --Bleep
509	*/
510	static void
511	read_auth_reply(fde_t fd, void data)
512	{
513	struct AuthRequest *auth = data;
514	const char *username = NULL;
515	ssize_t len = 0;
516	char buf[RFC1413_BUFSIZ + 1];
517
518	if ((len = recv(fd->fd, buf, RFC1413_BUFSIZ, 0)) > 0)
519	{
520	buf[len] = '\0';
521	username = check_ident_reply(buf);
522	}
523
524	fd_close(fd);
525
526	ClearAuth(auth);
527
528	if (EmptyString(username))
529	{
530	sendheader(auth->client, REPORT_FAIL_ID);
531	++ServerStats.is_abad;
532	}
533	else
534	{
535	strlcpy(auth->client->username, username, sizeof(auth->client->username));
536	sendheader(auth->client, REPORT_FIN_ID);
537	++ServerStats.is_asuc;
538	SetGotId(auth->client);
539	}
540
541	release_auth_client(auth);
542	}
543
544	/*
545	* delete_auth()
546	*/
547	void
548	delete_auth(struct AuthRequest *auth)
549	{
550	if (IsDNSPending(auth))
551	delete_resolver_queries(auth);
552
553	if (IsDoingAuth(auth))
554	fd_close(&auth->fd);
555
556	if (IsInAuth(auth))
557	{
558	dlinkDelete(&auth->node, &auth_pending_list);
559	ClearInAuth(auth);
560	}
561	}
562
563	/* auth_init
564	*
565	* Initialise the auth code
566	*/
567	void
568	auth_init(void)
569	{
570	static struct event timeout_auth_queries =
571	{
572	.name = "timeout_auth_queries_event",
573	.handler = timeout_auth_queries_event,
574	.when = 1
575	};
576
577	event_add(&timeout_auth_queries, NULL);
578	}