trunk/src/auth.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2018 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,
  REPORT_HOST_INVALID
};

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

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

static dlink_list auth_list;
static void auth_read_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;
  AddFlag(client, FLAGS_FINISHED_AUTH);

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

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

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

  assert(p);

  if (EmptyString(p) || *p == '.' || *p == ':')
    return 0;

  for (; *p; ++p)
    if (!IsHostChar(*p))
      return 0;

  return 1;
}

/*
 * 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 if (!auth_verify_hostname(name))
      sendheader(auth->client, REPORT_HOST_INVALID);
    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 void
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",
                 client_get_name(auth->client, SHOW_IP), errno);
    ++ServerStats.is_abad;
    return;
  }

  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);
}

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

  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",
                 client_get_name(auth->client, SHOW_IP), errno);
    auth_error(auth);
    return;
  }

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

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

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

  comm_setselect(fd, COMM_SELECT_READ, auth_read_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 unsigned int count = token_vector(reply, ':', vector, USERID_TOKEN_COUNT);

  if (USERID_TOKEN_COUNT != count)
    return NULL;

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

  if (EmptyString(token))
    return NULL;

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

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

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

  if (EmptyString(token))
    return NULL;

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

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

/*
 * auth_read_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
auth_read_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);
}

/*
 * auth_delete()
 */
void
auth_delete(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:	8298
Committed:	Sun Feb 25 11:15:47 2018 UTC (8 years, 4 months ago) by michael
Content type:	text/x-csrc
File size:	14575 byte(s)
Log Message:	- auth.c:release_auth_client(): use the AddFlag macro
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	8279	* Copyright (c) 1997-2018 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	michael	8217	REPORT_HOST_TOOLONG,
66			REPORT_HOST_INVALID
67	adx	30	};
68
69	michael	5888	static const char *const HeaderMessages[] =
70			{
71			[REPORT_DO_DNS] = ":*** Looking up your hostname",
72			[REPORT_FIN_DNS] = ":*** Found your hostname",
73			[REPORT_FAIL_DNS] = ":*** Couldn't look up your hostname",
74			[REPORT_DO_ID] = ":*** Checking Ident",
75			[REPORT_FIN_ID] = ":*** Got Ident response",
76			[REPORT_FAIL_ID] = ":*** No Ident response",
77			[REPORT_IP_MISMATCH] = ":*** Your forward and reverse DNS do not match, ignoring hostname",
78	michael	8217	[REPORT_HOST_TOOLONG] = ":*** Your hostname is too long, ignoring hostname",
79			[REPORT_HOST_INVALID] = ":*** Your hostname contains illegal characters, ignoring hostname"
80	michael	5888	};
81
82	michael	5497	#define sendheader(c, i) sendto_one_notice((c), &me, "%s", HeaderMessages[(i)])
83	adx	30
84	michael	6478	static dlink_list auth_list;
85	michael	7955	static void auth_read_reply(fde_t , void );
86	michael	4464	static void auth_connect_callback(fde_t , int, void );
87	adx	30
88	michael	4094
89	adx	30	/*
90			* make_auth_request - allocate a new auth request
91			*/
92			static struct AuthRequest *
93			make_auth_request(struct Client *client)
94			{
95	michael	6690	struct AuthRequest *const auth = &client->connection->auth;
96	adx	30
97	michael	6690	memset(auth, 0, sizeof(*auth));
98	adx	30
99	michael	6690	auth->client = client;
100			auth->timeout = CurrentTime + CONNECTTIMEOUT;
101	michael	2181
102	michael	6690	return auth;
103	adx	30	}
104
105			/*
106			* release_auth_client - release auth client from auth system
107			* this adds the client into the local client lists so it can be read by
108			* the main io processing loop
109			*/
110			void
111	michael	992	release_auth_client(struct AuthRequest *auth)
112	adx	30	{
113	michael	4854	struct Client *const client = auth->client;
114	michael	992
115			if (IsDoingAuth(auth) \|\| IsDNSPending(auth))
116			return;
117
118	michael	2929	if (IsInAuth(auth))
119			{
120	michael	6478	dlinkDelete(&auth->node, &auth_list);
121	michael	2929	ClearInAuth(auth);
122			}
123	michael	992
124	adx	30	/*
125			* When a client has auth'ed, we want to start reading what it sends
126			* us. This is what read_packet() does.
127			* -- adrian
128			*/
129	michael	4588	client->connection->allow_read = MAX_FLOOD;
130			comm_setflush(&client->connection->fd, 1000, flood_recalc, client);
131	michael	650
132	michael	4588	client->connection->since = CurrentTime;
133			client->connection->lasttime = CurrentTime;
134			client->connection->firsttime = CurrentTime;
135	michael	8298	AddFlag(client, FLAGS_FINISHED_AUTH);
136	michael	650
137	michael	8214	strlcpy(client->realhost, client->host, sizeof(client->realhost));
138
139	michael	4588	read_packet(&client->connection->fd, client);
140	adx	30	}
141	michael	2916
142	michael	8218	/*! Checks if a hostname is valid and doesn't contain illegal characters
143			* \param hostname The string to verify
144			* \return 1 if it is valid, 0 if it isn't
145			*/
146	michael	8217	static int
147			auth_verify_hostname(const char *hostname)
148			{
149			const char *p = hostname;
150
151			assert(p);
152
153			if (EmptyString(p) \|\| p == '.' \|\| p == ':')
154			return 0;
155
156			for (; *p; ++p)
157			if (!IsHostChar(*p))
158			return 0;
159
160			return 1;
161			}
162
163	adx	30	/*
164			* auth_dns_callback - called when resolver query finishes
165	michael	998	* if the query resulted in a successful search, name will contain
166			* a non-NULL pointer, otherwise name will be NULL.
167	adx	30	* set the client on it's way to a connection completion, regardless
168			* of success of failure
169			*/
170			static void
171	michael	4408	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name, size_t namelength)
172	adx	30	{
173	michael	4854	struct AuthRequest *const auth = vptr;
174	adx	30
175			ClearDNSPending(auth);
176
177	michael	4408	if (!EmptyString(name))
178	adx	30	{
179	michael	4588	if (auth->client->connection->ip.ss.ss_family == AF_INET6)
180	adx	30	{
181	michael	4858	const struct sockaddr_in6 const v6 = (const struct sockaddr_in6 )&auth->client->connection->ip;
182			const struct sockaddr_in6 const v6dns = (const struct sockaddr_in6 )addr;
183	michael	3250
184	michael	5902	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)))
185	adx	30	{
186			sendheader(auth->client, REPORT_IP_MISMATCH);
187	michael	4408	release_auth_client(auth);
188			return;
189	adx	30	}
190			}
191			else
192			{
193	michael	4858	const struct sockaddr_in const v4 = (const struct sockaddr_in )&auth->client->connection->ip;
194			const struct sockaddr_in const v4dns = (const struct sockaddr_in )addr;
195	michael	3250
196			if (v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
197	adx	30	{
198			sendheader(auth->client, REPORT_IP_MISMATCH);
199	michael	4408	release_auth_client(auth);
200			return;
201	adx	30	}
202			}
203	michael	3250
204	michael	4408	if (namelength > HOSTLEN)
205			sendheader(auth->client, REPORT_HOST_TOOLONG);
206	michael	8217	else if (!auth_verify_hostname(name))
207			sendheader(auth->client, REPORT_HOST_INVALID);
208	michael	4408	else
209	adx	30	{
210	michael	4408	strlcpy(auth->client->host, name, sizeof(auth->client->host));
211	adx	30	sendheader(auth->client, REPORT_FIN_DNS);
212			}
213			}
214			else
215	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
216	adx	30
217	michael	992	release_auth_client(auth);
218	adx	30	}
219
220			/*
221			* authsenderr - handle auth send errors
222			*/
223			static void
224			auth_error(struct AuthRequest *auth)
225			{
226	michael	896	++ServerStats.is_abad;
227	adx	30
228			fd_close(&auth->fd);
229
230			ClearAuth(auth);
231
232			sendheader(auth->client, REPORT_FAIL_ID);
233
234	michael	992	release_auth_client(auth);
235	adx	30	}
236
237			/*
238	michael	2916	* start_auth_query - Flag the client to show that an attempt to
239	adx	30	* contact the ident server on
240			* the client's host. The connect and subsequently the socket are all put
241			* into 'non-blocking' mode. Should the connect or any later phase of the
242			* identifing process fail, it is aborted and the user is given a username
243			* of "unknown".
244			*/
245	michael	6979	static void
246	adx	30	start_auth_query(struct AuthRequest *auth)
247			{
248			struct irc_ssaddr localaddr;
249			socklen_t locallen = sizeof(struct irc_ssaddr);
250			struct sockaddr_in6 *v6;
251
252			/* open a socket of the same type as the client socket */
253	michael	4588	if (comm_open(&auth->fd, auth->client->connection->ip.ss.ss_family,
254	adx	30	SOCK_STREAM, 0, "ident") == -1)
255			{
256	michael	2916	report_error(L_ALL, "creating auth stream socket %s:%s",
257	michael	7997	client_get_name(auth->client, SHOW_IP), errno);
258	michael	896	++ServerStats.is_abad;
259	michael	6979	return;
260	adx	30	}
261
262	michael	6976	SetDoingAuth(auth);
263	adx	30	sendheader(auth->client, REPORT_DO_ID);
264
265	michael	2916	/*
266	michael	4865	* Get the local address of the client and bind to that to
267			* make the auth request.
268	adx	30	*/
269			memset(&localaddr, 0, locallen);
270	michael	4588	getsockname(auth->client->connection->fd.fd, (struct sockaddr*)&localaddr,
271	adx	30	&locallen);
272
273			remove_ipv6_mapping(&localaddr);
274			v6 = (struct sockaddr_in6 *)&localaddr;
275			v6->sin6_port = htons(0);
276			localaddr.ss_port = htons(0);
277
278	michael	4309	comm_connect_tcp(&auth->fd, auth->client->sockhost, RFC1413_PORT,
279	michael	2916	(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
280	michael	4588	auth, auth->client->connection->ip.ss.ss_family,
281	adx	30	GlobalSetOptions.ident_timeout);
282			}
283
284			/*
285	michael	7955	* auth_start
286	adx	30	*
287			* inputs - pointer to client to auth
288			* output - NONE
289			* side effects - starts auth (identd) and dns queries for a client
290			*/
291	michael	2916	void
292	michael	7955	auth_start(struct Client *client_p)
293	adx	30	{
294	michael	4854	struct AuthRequest *const auth = make_auth_request(client_p);
295	adx	30
296	michael	2929	SetInAuth(auth);
297	michael	6478	dlinkAddTail(auth, &auth->node, &auth_list);
298	adx	30
299	michael	3250	sendheader(client_p, REPORT_DO_DNS);
300	adx	30
301	michael	992	SetDNSPending(auth);
302
303	michael	4340	if (ConfigGeneral.disable_auth == 0)
304	adx	30	start_auth_query(auth);
305
306	michael	4588	gethost_byaddr(auth_dns_callback, auth, &client_p->connection->ip);
307	adx	30	}
308
309			/*
310			* timeout_auth_queries - timeout resolver and identd requests
311			* allow clients through if requests failed
312			*/
313			static void
314			timeout_auth_queries_event(void *notused)
315			{
316	michael	7914	dlink_node node, node_next;
317	adx	30
318	michael	6478	DLINK_FOREACH_SAFE(node, node_next, auth_list.head)
319	adx	30	{
320	michael	4815	struct AuthRequest *auth = node->data;
321	adx	30
322	michael	992	if (auth->timeout > CurrentTime)
323	michael	2929	break;
324	adx	30
325	michael	992	if (IsDoingAuth(auth))
326	michael	2916	{
327	michael	896	++ServerStats.is_abad;
328	michael	1000	fd_close(&auth->fd);
329	michael	998	ClearAuth(auth);
330	adx	30	sendheader(auth->client, REPORT_FAIL_ID);
331	michael	992	}
332	adx	30
333	michael	992	if (IsDNSPending(auth))
334			{
335			delete_resolver_queries(auth);
336	michael	998	ClearDNSPending(auth);
337	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
338			}
339	adx	30
340	michael	992	release_auth_client(auth);
341	adx	30	}
342			}
343
344			/*
345			* auth_connect_callback() - deal with the result of comm_connect_tcp()
346			*
347			* If the connection failed, we simply close the auth fd and report
348			* a failure. If the connection suceeded send the ident server a query
349			* giving "theirport , ourport". The write is only attempted once so
350			* it is deemed to be a fail if the entire write doesn't write all the
351			* data given. This shouldnt be a problem since the socket should have
352			* a write buffer far greater than this message to store it in should
353			* problems arise. -avalon
354			*/
355			static void
356			auth_connect_callback(fde_t fd, int error, void data)
357			{
358	michael	4862	struct AuthRequest *const auth = data;
359	adx	30	struct irc_ssaddr us;
360			struct irc_ssaddr them;
361	michael	4859	char authbuf[16];
362	michael	5720	ssize_t len = 0;
363	adx	30	socklen_t ulen = sizeof(struct irc_ssaddr);
364			socklen_t tlen = sizeof(struct irc_ssaddr);
365	michael	1032	uint16_t uport, tport;
366	adx	30	struct sockaddr_in6 *v6;
367
368			if (error != COMM_OK)
369			{
370			auth_error(auth);
371			return;
372			}
373
374	michael	4588	if (getsockname(auth->client->connection->fd.fd, (struct sockaddr *)&us, &ulen) \|\|
375			getpeername(auth->client->connection->fd.fd, (struct sockaddr *)&them, &tlen))
376	adx	30	{
377	michael	4864	report_error(L_ALL, "auth get{sock,peer}name error %s:%s",
378	michael	7997	client_get_name(auth->client, SHOW_IP), errno);
379	adx	30	auth_error(auth);
380			return;
381			}
382
383			v6 = (struct sockaddr_in6 *)&us;
384			uport = ntohs(v6->sin6_port);
385			v6 = (struct sockaddr_in6 *)&them;
386			tport = ntohs(v6->sin6_port);
387	michael	2916
388	michael	5720	len = snprintf(authbuf, sizeof(authbuf), "%u, %u\r\n", tport, uport);
389	adx	30
390	michael	5720	if (send(fd->fd, authbuf, len, 0) != len)
391	adx	30	{
392			auth_error(auth);
393			return;
394			}
395	michael	696
396	michael	7955	comm_setselect(fd, COMM_SELECT_READ, auth_read_reply, auth, 0);
397	adx	30	}
398
399	michael	4309	/** Enum used to index ident reply fields in a human-readable way. */
400			enum IdentReplyFields
401			{
402			IDENT_PORT_NUMBERS,
403			IDENT_REPLY_TYPE,
404			IDENT_OS_TYPE,
405			IDENT_INFO,
406			USERID_TOKEN_COUNT
407			};
408
409			/** Parse an ident reply line and extract the userid from it.
410			* \param reply The ident reply line.
411			* \return The userid, or NULL on parse failure.
412			*/
413			static const char *
414	michael	4862	check_ident_reply(char *const reply)
415	michael	4309	{
416			char token = NULL, end = NULL;
417			char *vector[USERID_TOKEN_COUNT];
418	michael	7584	const unsigned int count = token_vector(reply, ':', vector, USERID_TOKEN_COUNT);
419	michael	4309
420			if (USERID_TOKEN_COUNT != count)
421			return NULL;
422
423			/*
424			* Second token is the reply type
425			*/
426			token = vector[IDENT_REPLY_TYPE];
427
428			if (EmptyString(token))
429			return NULL;
430
431			while (IsSpace(*token))
432			++token;
433
434			if (strncmp(token, "USERID", 6))
435			return NULL;
436
437			/*
438			* Third token is the os type
439			*/
440			token = vector[IDENT_OS_TYPE];
441
442			if (EmptyString(token))
443			return NULL;
444
445			while (IsSpace(*token))
446			++token;
447
448			/*
449			* Unless "OTHER" is specified as the operating system type, the server
450			* is expected to return the "normal" user identification of the owner
451			* of this connection. "Normal" in this context may be taken to mean a
452			* string of characters which uniquely identifies the connection owner
453			* such as a user identifier assigned by the system administrator and
454			* used by such user as a mail identifier, or as the "user" part of a
455			* user/password pair used to gain access to system resources. When an
456			* operating system is specified (e.g., anything but "OTHER"), the user
457			* identifier is expected to be in a more or less immediately useful
458			* form - e.g., something that could be used as an argument to "finger"
459			* or as a mail address.
460			*/
461			if (!strncmp(token, "OTHER", 5))
462			return NULL;
463
464			/*
465			* Fourth token is the username
466			*/
467			token = vector[IDENT_INFO];
468
469			if (EmptyString(token))
470			return NULL;
471
472			while (IsSpace(*token))
473			++token;
474
475			while (token == '~' \|\| token == '^')
476			++token;
477
478			/*
479			* Look for the end of the username, terminators are '\0, @, <SPACE>, :'
480			*/
481			for (end = token; *end; ++end)
482			if (IsSpace(end) \|\| '@' == end \|\| ':' == *end)
483			break;
484			*end = '\0';
485
486			return token;
487			}
488
489	adx	30	/*
490	michael	7955	* auth_read_reply - read the reply (if any) from the ident server
491	adx	30	* we connected to.
492			* We only give it one shot, if the reply isn't good the first time
493			* fail the authentication entirely. --Bleep
494			*/
495			static void
496	michael	7955	auth_read_reply(fde_t fd, void data)
497	adx	30	{
498	michael	4854	struct AuthRequest *const auth = data;
499	michael	4309	const char *username = NULL;
500			ssize_t len = 0;
501			char buf[RFC1413_BUFSIZ + 1];
502	adx	30
503	michael	4309	if ((len = recv(fd->fd, buf, RFC1413_BUFSIZ, 0)) > 0)
504	adx	30	{
505			buf[len] = '\0';
506	michael	4309	username = check_ident_reply(buf);
507	adx	30	}
508
509			fd_close(fd);
510
511			ClearAuth(auth);
512
513	michael	4309	if (EmptyString(username))
514	adx	30	{
515			sendheader(auth->client, REPORT_FAIL_ID);
516	michael	896	++ServerStats.is_abad;
517	adx	30	}
518			else
519			{
520	michael	4309	strlcpy(auth->client->username, username, sizeof(auth->client->username));
521	adx	30	sendheader(auth->client, REPORT_FIN_ID);
522	michael	896	++ServerStats.is_asuc;
523	michael	6313	AddFlag(auth->client, FLAGS_GOTID);
524	adx	30	}
525
526	michael	992	release_auth_client(auth);
527	adx	30	}
528
529			/*
530	michael	7955	* auth_delete()
531	adx	30	*/
532	michael	2916	void
533	michael	7955	auth_delete(struct AuthRequest *auth)
534	adx	30	{
535	michael	992	if (IsDNSPending(auth))
536			delete_resolver_queries(auth);
537	adx	30
538	michael	1000	if (IsDoingAuth(auth))
539			fd_close(&auth->fd);
540
541	michael	2929	if (IsInAuth(auth))
542			{
543	michael	6478	dlinkDelete(&auth->node, &auth_list);
544	michael	2929	ClearInAuth(auth);
545			}
546	adx	30	}
547	michael	4309
548			/* auth_init
549			*
550			* Initialise the auth code
551			*/
552			void
553			auth_init(void)
554			{
555			static struct event timeout_auth_queries =
556			{
557			.name = "timeout_auth_queries_event",
558			.handler = timeout_auth_queries_event,
559			.when = 1
560			};
561
562			event_add(&timeout_auth_queries, NULL);
563			}