8.2.x/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., 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"


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 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 request = &client->connection->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 *const 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->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))
  {
    const struct sockaddr_in *v4, *v4dns;
    const struct sockaddr_in6 *v6, *v6dns;

    if (auth->client->connection->ip.ss.ss_family == AF_INET6)
    {
      v6 = (const struct sockaddr_in6 *)&auth->client->connection->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
    {
      v4 = (const struct sockaddr_in *)&auth->client->connection->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);
  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;
  }

  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->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_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->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_pending_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 *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;
  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))
  {
    ilog(LOG_TYPE_IRCD, "auth get{sock,peer}name error for %s",
         get_client_name(auth->client, SHOW_IP));
    auth_error(auth);
    return;
  }

  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);

  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 *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;
    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:	4853
Committed:	Thu Nov 6 17:39:08 2014 UTC (9 years, 5 months ago) by michael
Content type:	text/x-csrc
File size:	14030 byte(s)
Log Message:	- auth.c: constification
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	2916	* Copyright (c) 1997-2014 ircd-hybrid development team
5	adx	30	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18	michael	4564	* 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	3564	static const char *const HeaderMessages[] =
57	michael	2916	{
58	michael	4310	":*** Looking up your hostname",
59	michael	3168	":*** Found your hostname",
60			":*** Couldn't look up your hostname",
61			":*** Checking Ident",
62			":*** Got Ident response",
63			":*** No Ident response",
64	michael	4310	":*** Your forward and reverse DNS do not match, ignoring hostname",
65	michael	3168	":*** Your hostname is too long, ignoring hostname"
66	adx	30	};
67
68	michael	2916	enum
69			{
70	adx	30	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	michael	3168	#define sendheader(c, i) sendto_one_notice((c), &me, HeaderMessages[(i)])
81	adx	30
82	michael	4310	static dlink_list auth_pending_list;
83	michael	4462	static void read_auth_reply(fde_t , void );
84	michael	4463	static void auth_connect_callback(fde_t , int, void );
85	adx	30
86	michael	4095
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	4853	struct AuthRequest *const request = &client->connection->auth;
94	adx	30
95	michael	1654	memset(request, 0, sizeof(*request));
96	adx	30
97	michael	2181	request->client = client;
98			request->timeout = CurrentTime + CONNECTTIMEOUT;
99
100	michael	650	return request;
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	4853	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	4310	dlinkDelete(&auth->node, &auth_pending_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	4589	client->connection->allow_read = MAX_FLOOD;
128			comm_setflush(&client->connection->fd, 1000, flood_recalc, client);
129	michael	650
130	michael	4589	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	4589	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	4409	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name, size_t namelength)
147	adx	30	{
148	michael	4853	struct AuthRequest *const auth = vptr;
149	adx	30
150			ClearDNSPending(auth);
151
152	michael	4409	if (!EmptyString(name))
153	adx	30	{
154	michael	992	const struct sockaddr_in v4, v4dns;
155			const struct sockaddr_in6 v6, v6dns;
156	adx	30
157	michael	4589	if (auth->client->connection->ip.ss.ss_family == AF_INET6)
158	adx	30	{
159	michael	4589	v6 = (const struct sockaddr_in6 *)&auth->client->connection->ip;
160	michael	992	v6dns = (const struct sockaddr_in6 *)addr;
161	michael	3250
162	adx	30	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
163			{
164			sendheader(auth->client, REPORT_IP_MISMATCH);
165	michael	4409	release_auth_client(auth);
166			return;
167	adx	30	}
168			}
169			else
170			{
171	michael	4589	v4 = (const struct sockaddr_in *)&auth->client->connection->ip;
172	michael	992	v4dns = (const struct sockaddr_in *)addr;
173	michael	3250
174			if (v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
175	adx	30	{
176			sendheader(auth->client, REPORT_IP_MISMATCH);
177	michael	4409	release_auth_client(auth);
178			return;
179	adx	30	}
180			}
181	michael	3250
182	michael	4409	if (namelength > HOSTLEN)
183			sendheader(auth->client, REPORT_HOST_TOOLONG);
184			else
185	adx	30	{
186	michael	4409	strlcpy(auth->client->host, name, sizeof(auth->client->host));
187	adx	30	sendheader(auth->client, REPORT_FIN_DNS);
188			}
189			}
190			else
191	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
192	adx	30
193	michael	992	release_auth_client(auth);
194	adx	30	}
195
196			/*
197			* authsenderr - handle auth send errors
198			*/
199			static void
200			auth_error(struct AuthRequest *auth)
201			{
202	michael	896	++ServerStats.is_abad;
203	adx	30
204			fd_close(&auth->fd);
205
206			ClearAuth(auth);
207
208			sendheader(auth->client, REPORT_FAIL_ID);
209
210	michael	992	release_auth_client(auth);
211	adx	30	}
212
213			/*
214	michael	2916	* start_auth_query - Flag the client to show that an attempt to
215	adx	30	* contact the ident server on
216			* the client's host. The connect and subsequently the socket are all put
217			* into 'non-blocking' mode. Should the connect or any later phase of the
218			* identifing process fail, it is aborted and the user is given a username
219			* of "unknown".
220			*/
221			static int
222			start_auth_query(struct AuthRequest *auth)
223			{
224			struct irc_ssaddr localaddr;
225			socklen_t locallen = sizeof(struct irc_ssaddr);
226			struct sockaddr_in6 *v6;
227
228			/* open a socket of the same type as the client socket */
229	michael	4589	if (comm_open(&auth->fd, auth->client->connection->ip.ss.ss_family,
230	adx	30	SOCK_STREAM, 0, "ident") == -1)
231			{
232	michael	2916	report_error(L_ALL, "creating auth stream socket %s:%s",
233			get_client_name(auth->client, SHOW_IP), errno);
234	michael	896	++ServerStats.is_abad;
235	adx	30	return 0;
236			}
237
238			sendheader(auth->client, REPORT_DO_ID);
239
240	michael	2916	/*
241	adx	30	* get the local address of the client and bind to that to
242			* make the auth request. This used to be done only for
243			* ifdef VIRTUAL_HOST, but needs to be done for all clients
244			* since the ident request must originate from that same address--
245			* and machines with multiple IP addresses are common now
246			*/
247			memset(&localaddr, 0, locallen);
248	michael	4589	getsockname(auth->client->connection->fd.fd, (struct sockaddr*)&localaddr,
249	adx	30	&locallen);
250
251			remove_ipv6_mapping(&localaddr);
252			v6 = (struct sockaddr_in6 *)&localaddr;
253			v6->sin6_port = htons(0);
254			localaddr.ss_port = htons(0);
255
256	michael	4310	comm_connect_tcp(&auth->fd, auth->client->sockhost, RFC1413_PORT,
257	michael	2916	(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
258	michael	4589	auth, auth->client->connection->ip.ss.ss_family,
259	adx	30	GlobalSetOptions.ident_timeout);
260			return 1; /* We suceed here for now */
261			}
262
263			/*
264	michael	2916	* start_auth
265	adx	30	*
266			* inputs - pointer to client to auth
267			* output - NONE
268			* side effects - starts auth (identd) and dns queries for a client
269			*/
270	michael	2916	void
271	michael	3250	start_auth(struct Client *client_p)
272	adx	30	{
273	michael	4853	struct AuthRequest *const auth = make_auth_request(client_p);
274	adx	30
275	michael	2929	SetInAuth(auth);
276	michael	4310	dlinkAddTail(auth, &auth->node, &auth_pending_list);
277	adx	30
278	michael	3250	sendheader(client_p, REPORT_DO_DNS);
279	adx	30
280	michael	992	SetDNSPending(auth);
281
282	michael	4341	if (ConfigGeneral.disable_auth == 0)
283	michael	992	{
284			SetDoingAuth(auth);
285	adx	30	start_auth_query(auth);
286	michael	992	}
287	adx	30
288	michael	4589	gethost_byaddr(auth_dns_callback, auth, &client_p->connection->ip);
289	adx	30	}
290
291			/*
292			* timeout_auth_queries - timeout resolver and identd requests
293			* allow clients through if requests failed
294			*/
295			static void
296			timeout_auth_queries_event(void *notused)
297			{
298	michael	4816	dlink_node node = NULL, node_next = NULL;
299	adx	30
300	michael	4816	DLINK_FOREACH_SAFE(node, node_next, auth_pending_list.head)
301	adx	30	{
302	michael	4816	struct AuthRequest *auth = node->data;
303	adx	30
304	michael	992	if (auth->timeout > CurrentTime)
305	michael	2929	break;
306	adx	30
307	michael	992	if (IsDoingAuth(auth))
308	michael	2916	{
309	michael	896	++ServerStats.is_abad;
310	michael	1000	fd_close(&auth->fd);
311	michael	998	ClearAuth(auth);
312	adx	30	sendheader(auth->client, REPORT_FAIL_ID);
313	michael	992	}
314	adx	30
315	michael	992	if (IsDNSPending(auth))
316			{
317			delete_resolver_queries(auth);
318	michael	998	ClearDNSPending(auth);
319	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
320			}
321	adx	30
322	michael	992	release_auth_client(auth);
323	adx	30	}
324			}
325
326			/*
327			* auth_connect_callback() - deal with the result of comm_connect_tcp()
328			*
329			* If the connection failed, we simply close the auth fd and report
330			* a failure. If the connection suceeded send the ident server a query
331			* giving "theirport , ourport". The write is only attempted once so
332			* it is deemed to be a fail if the entire write doesn't write all the
333			* data given. This shouldnt be a problem since the socket should have
334			* a write buffer far greater than this message to store it in should
335			* problems arise. -avalon
336			*/
337			static void
338			auth_connect_callback(fde_t fd, int error, void data)
339			{
340			struct AuthRequest *auth = data;
341			struct irc_ssaddr us;
342			struct irc_ssaddr them;
343			char authbuf[32];
344			socklen_t ulen = sizeof(struct irc_ssaddr);
345			socklen_t tlen = sizeof(struct irc_ssaddr);
346	michael	1032	uint16_t uport, tport;
347	adx	30	struct sockaddr_in6 *v6;
348
349			if (error != COMM_OK)
350			{
351			auth_error(auth);
352			return;
353			}
354
355	michael	4589	if (getsockname(auth->client->connection->fd.fd, (struct sockaddr *)&us, &ulen) \|\|
356			getpeername(auth->client->connection->fd.fd, (struct sockaddr *)&them, &tlen))
357	adx	30	{
358	michael	1247	ilog(LOG_TYPE_IRCD, "auth get{sock,peer}name error for %s",
359	michael	3250	get_client_name(auth->client, SHOW_IP));
360	adx	30	auth_error(auth);
361			return;
362			}
363
364			v6 = (struct sockaddr_in6 *)&us;
365			uport = ntohs(v6->sin6_port);
366			v6 = (struct sockaddr_in6 *)&them;
367			tport = ntohs(v6->sin6_port);
368			remove_ipv6_mapping(&us);
369			remove_ipv6_mapping(&them);
370	michael	2916
371	michael	4310	snprintf(authbuf, sizeof(authbuf), "%u, %u\r\n", tport, uport);
372	adx	30
373			if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
374			{
375			auth_error(auth);
376			return;
377			}
378	michael	696
379	michael	4310	comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
380	adx	30	}
381
382	michael	4310	/** Enum used to index ident reply fields in a human-readable way. */
383			enum IdentReplyFields
384			{
385			IDENT_PORT_NUMBERS,
386			IDENT_REPLY_TYPE,
387			IDENT_OS_TYPE,
388			IDENT_INFO,
389			USERID_TOKEN_COUNT
390			};
391
392			/** Parse an ident reply line and extract the userid from it.
393			* \param reply The ident reply line.
394			* \return The userid, or NULL on parse failure.
395			*/
396			static const char *
397			check_ident_reply(char *reply)
398			{
399			char token = NULL, end = NULL;
400			char *vector[USERID_TOKEN_COUNT];
401			int count = token_vector(reply, ':', vector, USERID_TOKEN_COUNT);
402
403			if (USERID_TOKEN_COUNT != count)
404			return NULL;
405
406			/*
407			* Second token is the reply type
408			*/
409			token = vector[IDENT_REPLY_TYPE];
410
411			if (EmptyString(token))
412			return NULL;
413
414			while (IsSpace(*token))
415			++token;
416
417			if (strncmp(token, "USERID", 6))
418			return NULL;
419
420			/*
421			* Third token is the os type
422			*/
423			token = vector[IDENT_OS_TYPE];
424
425			if (EmptyString(token))
426			return NULL;
427
428			while (IsSpace(*token))
429			++token;
430
431			/*
432			* Unless "OTHER" is specified as the operating system type, the server
433			* is expected to return the "normal" user identification of the owner
434			* of this connection. "Normal" in this context may be taken to mean a
435			* string of characters which uniquely identifies the connection owner
436			* such as a user identifier assigned by the system administrator and
437			* used by such user as a mail identifier, or as the "user" part of a
438			* user/password pair used to gain access to system resources. When an
439			* operating system is specified (e.g., anything but "OTHER"), the user
440			* identifier is expected to be in a more or less immediately useful
441			* form - e.g., something that could be used as an argument to "finger"
442			* or as a mail address.
443			*/
444			if (!strncmp(token, "OTHER", 5))
445			return NULL;
446
447			/*
448			* Fourth token is the username
449			*/
450			token = vector[IDENT_INFO];
451
452			if (EmptyString(token))
453			return NULL;
454
455			while (IsSpace(*token))
456			++token;
457
458			while (token == '~' \|\| token == '^')
459			++token;
460
461			/*
462			* Look for the end of the username, terminators are '\0, @, <SPACE>, :'
463			*/
464			for (end = token; *end; ++end)
465			if (IsSpace(end) \|\| '@' == end \|\| ':' == *end)
466			break;
467			*end = '\0';
468
469			return token;
470			}
471
472	adx	30	/*
473	michael	2916	* read_auth_reply - read the reply (if any) from the ident server
474	adx	30	* we connected to.
475			* We only give it one shot, if the reply isn't good the first time
476			* fail the authentication entirely. --Bleep
477			*/
478			static void
479			read_auth_reply(fde_t fd, void data)
480			{
481	michael	4853	struct AuthRequest *const auth = data;
482	michael	4310	const char *username = NULL;
483			ssize_t len = 0;
484			char buf[RFC1413_BUFSIZ + 1];
485	adx	30
486	michael	4310	if ((len = recv(fd->fd, buf, RFC1413_BUFSIZ, 0)) > 0)
487	adx	30	{
488			buf[len] = '\0';
489	michael	4310	username = check_ident_reply(buf);
490	adx	30	}
491
492			fd_close(fd);
493
494			ClearAuth(auth);
495
496	michael	4310	if (EmptyString(username))
497	adx	30	{
498			sendheader(auth->client, REPORT_FAIL_ID);
499	michael	896	++ServerStats.is_abad;
500	adx	30	}
501			else
502			{
503	michael	4310	strlcpy(auth->client->username, username, sizeof(auth->client->username));
504	adx	30	sendheader(auth->client, REPORT_FIN_ID);
505	michael	896	++ServerStats.is_asuc;
506	adx	30	SetGotId(auth->client);
507			}
508
509	michael	992	release_auth_client(auth);
510	adx	30	}
511
512			/*
513			* delete_auth()
514			*/
515	michael	2916	void
516	michael	992	delete_auth(struct AuthRequest *auth)
517	adx	30	{
518	michael	992	if (IsDNSPending(auth))
519			delete_resolver_queries(auth);
520	adx	30
521	michael	1000	if (IsDoingAuth(auth))
522			fd_close(&auth->fd);
523
524	michael	2929	if (IsInAuth(auth))
525			{
526	michael	4310	dlinkDelete(&auth->node, &auth_pending_list);
527	michael	2929	ClearInAuth(auth);
528			}
529	adx	30	}
530	michael	4310
531			/* auth_init
532			*
533			* Initialise the auth code
534			*/
535			void
536			auth_init(void)
537			{
538			static struct event timeout_auth_queries =
539			{
540			.name = "timeout_auth_queries_event",
541			.handler = timeout_auth_queries_event,
542			.when = 1
543			};
544
545			event_add(&timeout_auth_queries, NULL);
546			}