trunk/src/auth.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2015 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 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"


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
};

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"
};

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

static dlink_list auth_list;
static void read_auth_reply(fde_t *, void *);
static void auth_connect_callback(fde_t *, int, void *);


/*
 * make_auth_request - allocate a new auth request
 */
static struct AuthRequest *
make_auth_request(struct Client *client)
{
  struct AuthRequest *const auth = &client->connection->auth;

  memset(auth, 0, sizeof(*auth));

  auth->client = client;
  auth->timeout = CurrentTime + CONNECTTIMEOUT;

  return auth;
}

/*
 * 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 *const client = auth->client;

  if (IsDoingAuth(auth) || IsDNSPending(auth))
    return;

  if (IsInAuth(auth))
  {
    dlinkDelete(&auth->node, &auth_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->connection->allow_read = MAX_FLOOD;
  comm_setflush(&client->connection->fd, 1000, flood_recalc, client);

  client->connection->since     = CurrentTime;
  client->connection->lasttime  = CurrentTime;
  client->connection->firsttime = CurrentTime;
  client->flags |= FLAGS_FINISHED_AUTH;

  read_packet(&client->connection->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 *const auth = vptr;

  ClearDNSPending(auth);

  if (!EmptyString(name))
  {
    if (auth->client->connection->ip.ss.ss_family == AF_INET6)
    {
      const struct sockaddr_in6 *const v6 = (const struct sockaddr_in6 *)&auth->client->connection->ip;
      const struct sockaddr_in6 *const v6dns = (const struct sockaddr_in6 *)addr;

      if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)))
      {
        sendheader(auth->client, REPORT_IP_MISMATCH);
        release_auth_client(auth);
        return;
      }
    }
    else
    {
      const struct sockaddr_in *const v4 = (const struct sockaddr_in *)&auth->client->connection->ip;
      const struct sockaddr_in *const 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);
  struct sockaddr_in6 *v6;

  /* open a socket of the same type as the client socket */
  if (comm_open(&auth->fd, auth->client->connection->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);
    ++ServerStats.is_abad;
    return 0;
  }

  SetDoingAuth(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);
  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->connection->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 *const auth = make_auth_request(client_p);

  SetInAuth(auth);
  dlinkAddTail(auth, &auth->node, &auth_list);

  sendheader(client_p, REPORT_DO_DNS);

  SetDNSPending(auth);

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

  gethost_byaddr(auth_dns_callback, auth, &client_p->connection->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 *node = NULL, *node_next = NULL;

  DLINK_FOREACH_SAFE(node, node_next, auth_list.head)
  {
    struct AuthRequest *auth = node->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);
    }

    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 *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;

  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",
                 get_client_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(fd->fd, authbuf, len, 0) != len)
  {
    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 *const reply)
{
  char *token = NULL, *end = NULL;
  char *vector[USERID_TOKEN_COUNT];
  const 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 *const 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;
    AddFlag(auth->client, FLAGS_GOTID);
  }

  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_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:	6976
Committed:	Mon Dec 21 17:07:46 2015 UTC (9 years, 8 months ago) by michael
Content type:	text/x-csrc
File size:	13942 byte(s)
Log Message:	- auth.c: fixed core on ident lookup if comm_open() fails
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	5347	* Copyright (c) 1997-2015 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	2916	* \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	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	1654	#include "mempool.h"
54	adx	30
55	michael	1011
56	michael	2916	enum
57			{
58	adx	30	REPORT_DO_DNS,
59			REPORT_FIN_DNS,
60			REPORT_FAIL_DNS,
61			REPORT_DO_ID,
62			REPORT_FIN_ID,
63			REPORT_FAIL_ID,
64			REPORT_IP_MISMATCH,
65			REPORT_HOST_TOOLONG
66			};
67
68	michael	5888	static const char *const HeaderMessages[] =
69			{
70			[REPORT_DO_DNS] = ":*** Looking up your hostname",
71			[REPORT_FIN_DNS] = ":*** Found your hostname",
72			[REPORT_FAIL_DNS] = ":*** Couldn't look up your hostname",
73			[REPORT_DO_ID] = ":*** Checking Ident",
74			[REPORT_FIN_ID] = ":*** Got Ident response",
75			[REPORT_FAIL_ID] = ":*** No Ident response",
76			[REPORT_IP_MISMATCH] = ":*** Your forward and reverse DNS do not match, ignoring hostname",
77			[REPORT_HOST_TOOLONG] = ":*** Your hostname is too long, ignoring hostname"
78			};
79
80	michael	5497	#define sendheader(c, i) sendto_one_notice((c), &me, "%s", HeaderMessages[(i)])
81	adx	30
82	michael	6478	static dlink_list auth_list;
83	michael	4461	static void read_auth_reply(fde_t , void );
84	michael	4464	static void auth_connect_callback(fde_t , int, void );
85	adx	30
86	michael	4094
87	adx	30	/*
88			* make_auth_request - allocate a new auth request
89			*/
90			static struct AuthRequest *
91			make_auth_request(struct Client *client)
92			{
93	michael	6690	struct AuthRequest *const auth = &client->connection->auth;
94	adx	30
95	michael	6690	memset(auth, 0, sizeof(*auth));
96	adx	30
97	michael	6690	auth->client = client;
98			auth->timeout = CurrentTime + CONNECTTIMEOUT;
99	michael	2181
100	michael	6690	return auth;
101	adx	30	}
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	michael	992	release_auth_client(struct AuthRequest *auth)
110	adx	30	{
111	michael	4854	struct Client *const client = auth->client;
112	michael	992
113			if (IsDoingAuth(auth) \|\| IsDNSPending(auth))
114			return;
115
116	michael	2929	if (IsInAuth(auth))
117			{
118	michael	6478	dlinkDelete(&auth->node, &auth_list);
119	michael	2929	ClearInAuth(auth);
120			}
121	michael	992
122	adx	30	/*
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	michael	4588	client->connection->allow_read = MAX_FLOOD;
128			comm_setflush(&client->connection->fd, 1000, flood_recalc, client);
129	michael	650
130	michael	4588	client->connection->since = CurrentTime;
131			client->connection->lasttime = CurrentTime;
132			client->connection->firsttime = CurrentTime;
133	michael	664	client->flags \|= FLAGS_FINISHED_AUTH;
134	michael	650
135	michael	4588	read_packet(&client->connection->fd, client);
136	adx	30	}
137	michael	2916
138	adx	30	/*
139			* auth_dns_callback - called when resolver query finishes
140	michael	998	* if the query resulted in a successful search, name will contain
141			* a non-NULL pointer, otherwise name will be NULL.
142	adx	30	* set the client on it's way to a connection completion, regardless
143			* of success of failure
144			*/
145			static void
146	michael	4408	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name, size_t namelength)
147	adx	30	{
148	michael	4854	struct AuthRequest *const auth = vptr;
149	adx	30
150			ClearDNSPending(auth);
151
152	michael	4408	if (!EmptyString(name))
153	adx	30	{
154	michael	4588	if (auth->client->connection->ip.ss.ss_family == AF_INET6)
155	adx	30	{
156	michael	4858	const struct sockaddr_in6 const v6 = (const struct sockaddr_in6 )&auth->client->connection->ip;
157			const struct sockaddr_in6 const v6dns = (const struct sockaddr_in6 )addr;
158	michael	3250
159	michael	5902	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)))
160	adx	30	{
161			sendheader(auth->client, REPORT_IP_MISMATCH);
162	michael	4408	release_auth_client(auth);
163			return;
164	adx	30	}
165			}
166			else
167			{
168	michael	4858	const struct sockaddr_in const v4 = (const struct sockaddr_in )&auth->client->connection->ip;
169			const struct sockaddr_in const v4dns = (const struct sockaddr_in )addr;
170	michael	3250
171			if (v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
172	adx	30	{
173			sendheader(auth->client, REPORT_IP_MISMATCH);
174	michael	4408	release_auth_client(auth);
175			return;
176	adx	30	}
177			}
178	michael	3250
179	michael	4408	if (namelength > HOSTLEN)
180			sendheader(auth->client, REPORT_HOST_TOOLONG);
181			else
182	adx	30	{
183	michael	4408	strlcpy(auth->client->host, name, sizeof(auth->client->host));
184	adx	30	sendheader(auth->client, REPORT_FIN_DNS);
185			}
186			}
187			else
188	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
189	adx	30
190	michael	992	release_auth_client(auth);
191	adx	30	}
192
193			/*
194			* authsenderr - handle auth send errors
195			*/
196			static void
197			auth_error(struct AuthRequest *auth)
198			{
199	michael	896	++ServerStats.is_abad;
200	adx	30
201			fd_close(&auth->fd);
202
203			ClearAuth(auth);
204
205			sendheader(auth->client, REPORT_FAIL_ID);
206
207	michael	992	release_auth_client(auth);
208	adx	30	}
209
210			/*
211	michael	2916	* start_auth_query - Flag the client to show that an attempt to
212	adx	30	* contact the ident server on
213			* the client's host. The connect and subsequently the socket are all put
214			* into 'non-blocking' mode. Should the connect or any later phase of the
215			* identifing process fail, it is aborted and the user is given a username
216			* of "unknown".
217			*/
218			static int
219			start_auth_query(struct AuthRequest *auth)
220			{
221			struct irc_ssaddr localaddr;
222			socklen_t locallen = sizeof(struct irc_ssaddr);
223			struct sockaddr_in6 *v6;
224
225			/* open a socket of the same type as the client socket */
226	michael	4588	if (comm_open(&auth->fd, auth->client->connection->ip.ss.ss_family,
227	adx	30	SOCK_STREAM, 0, "ident") == -1)
228			{
229	michael	2916	report_error(L_ALL, "creating auth stream socket %s:%s",
230			get_client_name(auth->client, SHOW_IP), errno);
231	michael	896	++ServerStats.is_abad;
232	adx	30	return 0;
233			}
234
235	michael	6976	SetDoingAuth(auth);
236	adx	30	sendheader(auth->client, REPORT_DO_ID);
237
238	michael	2916	/*
239	michael	4865	* Get the local address of the client and bind to that to
240			* make the auth request.
241	adx	30	*/
242			memset(&localaddr, 0, locallen);
243	michael	4588	getsockname(auth->client->connection->fd.fd, (struct sockaddr*)&localaddr,
244	adx	30	&locallen);
245
246			remove_ipv6_mapping(&localaddr);
247			v6 = (struct sockaddr_in6 *)&localaddr;
248			v6->sin6_port = htons(0);
249			localaddr.ss_port = htons(0);
250
251	michael	4309	comm_connect_tcp(&auth->fd, auth->client->sockhost, RFC1413_PORT,
252	michael	2916	(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
253	michael	4588	auth, auth->client->connection->ip.ss.ss_family,
254	adx	30	GlobalSetOptions.ident_timeout);
255			return 1; /* We suceed here for now */
256			}
257
258			/*
259	michael	2916	* start_auth
260	adx	30	*
261			* inputs - pointer to client to auth
262			* output - NONE
263			* side effects - starts auth (identd) and dns queries for a client
264			*/
265	michael	2916	void
266	michael	3250	start_auth(struct Client *client_p)
267	adx	30	{
268	michael	4854	struct AuthRequest *const auth = make_auth_request(client_p);
269	adx	30
270	michael	2929	SetInAuth(auth);
271	michael	6478	dlinkAddTail(auth, &auth->node, &auth_list);
272	adx	30
273	michael	3250	sendheader(client_p, REPORT_DO_DNS);
274	adx	30
275	michael	992	SetDNSPending(auth);
276
277	michael	4340	if (ConfigGeneral.disable_auth == 0)
278	adx	30	start_auth_query(auth);
279
280	michael	4588	gethost_byaddr(auth_dns_callback, auth, &client_p->connection->ip);
281	adx	30	}
282
283			/*
284			* timeout_auth_queries - timeout resolver and identd requests
285			* allow clients through if requests failed
286			*/
287			static void
288			timeout_auth_queries_event(void *notused)
289			{
290	michael	4815	dlink_node node = NULL, node_next = NULL;
291	adx	30
292	michael	6478	DLINK_FOREACH_SAFE(node, node_next, auth_list.head)
293	adx	30	{
294	michael	4815	struct AuthRequest *auth = node->data;
295	adx	30
296	michael	992	if (auth->timeout > CurrentTime)
297	michael	2929	break;
298	adx	30
299	michael	992	if (IsDoingAuth(auth))
300	michael	2916	{
301	michael	896	++ServerStats.is_abad;
302	michael	1000	fd_close(&auth->fd);
303	michael	998	ClearAuth(auth);
304	adx	30	sendheader(auth->client, REPORT_FAIL_ID);
305	michael	992	}
306	adx	30
307	michael	992	if (IsDNSPending(auth))
308			{
309			delete_resolver_queries(auth);
310	michael	998	ClearDNSPending(auth);
311	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
312			}
313	adx	30
314	michael	992	release_auth_client(auth);
315	adx	30	}
316			}
317
318			/*
319			* auth_connect_callback() - deal with the result of comm_connect_tcp()
320			*
321			* If the connection failed, we simply close the auth fd and report
322			* a failure. If the connection suceeded send the ident server a query
323			* giving "theirport , ourport". The write is only attempted once so
324			* it is deemed to be a fail if the entire write doesn't write all the
325			* data given. This shouldnt be a problem since the socket should have
326			* a write buffer far greater than this message to store it in should
327			* problems arise. -avalon
328			*/
329			static void
330			auth_connect_callback(fde_t fd, int error, void data)
331			{
332	michael	4862	struct AuthRequest *const auth = data;
333	adx	30	struct irc_ssaddr us;
334			struct irc_ssaddr them;
335	michael	4859	char authbuf[16];
336	michael	5720	ssize_t len = 0;
337	adx	30	socklen_t ulen = sizeof(struct irc_ssaddr);
338			socklen_t tlen = sizeof(struct irc_ssaddr);
339	michael	1032	uint16_t uport, tport;
340	adx	30	struct sockaddr_in6 *v6;
341
342			if (error != COMM_OK)
343			{
344			auth_error(auth);
345			return;
346			}
347
348	michael	4588	if (getsockname(auth->client->connection->fd.fd, (struct sockaddr *)&us, &ulen) \|\|
349			getpeername(auth->client->connection->fd.fd, (struct sockaddr *)&them, &tlen))
350	adx	30	{
351	michael	4864	report_error(L_ALL, "auth get{sock,peer}name error %s:%s",
352			get_client_name(auth->client, SHOW_IP), errno);
353	adx	30	auth_error(auth);
354			return;
355			}
356
357			v6 = (struct sockaddr_in6 *)&us;
358			uport = ntohs(v6->sin6_port);
359			v6 = (struct sockaddr_in6 *)&them;
360			tport = ntohs(v6->sin6_port);
361	michael	2916
362	michael	5720	len = snprintf(authbuf, sizeof(authbuf), "%u, %u\r\n", tport, uport);
363	adx	30
364	michael	5720	if (send(fd->fd, authbuf, len, 0) != len)
365	adx	30	{
366			auth_error(auth);
367			return;
368			}
369	michael	696
370	michael	4309	comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
371	adx	30	}
372
373	michael	4309	/** Enum used to index ident reply fields in a human-readable way. */
374			enum IdentReplyFields
375			{
376			IDENT_PORT_NUMBERS,
377			IDENT_REPLY_TYPE,
378			IDENT_OS_TYPE,
379			IDENT_INFO,
380			USERID_TOKEN_COUNT
381			};
382
383			/** Parse an ident reply line and extract the userid from it.
384			* \param reply The ident reply line.
385			* \return The userid, or NULL on parse failure.
386			*/
387			static const char *
388	michael	4862	check_ident_reply(char *const reply)
389	michael	4309	{
390			char token = NULL, end = NULL;
391			char *vector[USERID_TOKEN_COUNT];
392	michael	4862	const int count = token_vector(reply, ':', vector, USERID_TOKEN_COUNT);
393	michael	4309
394			if (USERID_TOKEN_COUNT != count)
395			return NULL;
396
397			/*
398			* Second token is the reply type
399			*/
400			token = vector[IDENT_REPLY_TYPE];
401
402			if (EmptyString(token))
403			return NULL;
404
405			while (IsSpace(*token))
406			++token;
407
408			if (strncmp(token, "USERID", 6))
409			return NULL;
410
411			/*
412			* Third token is the os type
413			*/
414			token = vector[IDENT_OS_TYPE];
415
416			if (EmptyString(token))
417			return NULL;
418
419			while (IsSpace(*token))
420			++token;
421
422			/*
423			* Unless "OTHER" is specified as the operating system type, the server
424			* is expected to return the "normal" user identification of the owner
425			* of this connection. "Normal" in this context may be taken to mean a
426			* string of characters which uniquely identifies the connection owner
427			* such as a user identifier assigned by the system administrator and
428			* used by such user as a mail identifier, or as the "user" part of a
429			* user/password pair used to gain access to system resources. When an
430			* operating system is specified (e.g., anything but "OTHER"), the user
431			* identifier is expected to be in a more or less immediately useful
432			* form - e.g., something that could be used as an argument to "finger"
433			* or as a mail address.
434			*/
435			if (!strncmp(token, "OTHER", 5))
436			return NULL;
437
438			/*
439			* Fourth token is the username
440			*/
441			token = vector[IDENT_INFO];
442
443			if (EmptyString(token))
444			return NULL;
445
446			while (IsSpace(*token))
447			++token;
448
449			while (token == '~' \|\| token == '^')
450			++token;
451
452			/*
453			* Look for the end of the username, terminators are '\0, @, <SPACE>, :'
454			*/
455			for (end = token; *end; ++end)
456			if (IsSpace(end) \|\| '@' == end \|\| ':' == *end)
457			break;
458			*end = '\0';
459
460			return token;
461			}
462
463	adx	30	/*
464	michael	2916	* read_auth_reply - read the reply (if any) from the ident server
465	adx	30	* we connected to.
466			* We only give it one shot, if the reply isn't good the first time
467			* fail the authentication entirely. --Bleep
468			*/
469			static void
470			read_auth_reply(fde_t fd, void data)
471			{
472	michael	4854	struct AuthRequest *const auth = data;
473	michael	4309	const char *username = NULL;
474			ssize_t len = 0;
475			char buf[RFC1413_BUFSIZ + 1];
476	adx	30
477	michael	4309	if ((len = recv(fd->fd, buf, RFC1413_BUFSIZ, 0)) > 0)
478	adx	30	{
479			buf[len] = '\0';
480	michael	4309	username = check_ident_reply(buf);
481	adx	30	}
482
483			fd_close(fd);
484
485			ClearAuth(auth);
486
487	michael	4309	if (EmptyString(username))
488	adx	30	{
489			sendheader(auth->client, REPORT_FAIL_ID);
490	michael	896	++ServerStats.is_abad;
491	adx	30	}
492			else
493			{
494	michael	4309	strlcpy(auth->client->username, username, sizeof(auth->client->username));
495	adx	30	sendheader(auth->client, REPORT_FIN_ID);
496	michael	896	++ServerStats.is_asuc;
497	michael	6313	AddFlag(auth->client, FLAGS_GOTID);
498	adx	30	}
499
500	michael	992	release_auth_client(auth);
501	adx	30	}
502
503			/*
504			* delete_auth()
505			*/
506	michael	2916	void
507	michael	992	delete_auth(struct AuthRequest *auth)
508	adx	30	{
509	michael	992	if (IsDNSPending(auth))
510			delete_resolver_queries(auth);
511	adx	30
512	michael	1000	if (IsDoingAuth(auth))
513			fd_close(&auth->fd);
514
515	michael	2929	if (IsInAuth(auth))
516			{
517	michael	6478	dlinkDelete(&auth->node, &auth_list);
518	michael	2929	ClearInAuth(auth);
519			}
520	adx	30	}
521	michael	4309
522			/* auth_init
523			*
524			* Initialise the auth code
525			*/
526			void
527			auth_init(void)
528			{
529			static struct event timeout_auth_queries =
530			{
531			.name = "timeout_auth_queries_event",
532			.handler = timeout_auth_queries_event,
533			.when = 1
534			};
535
536			event_add(&timeout_auth_queries, NULL);
537			}