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., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 */

/*! \file auth.c
 * \brief Functions for querying a users ident.
 * \version $Id$
 */

/*
 * Changes:
 *   July 6, 1999 - Rewrote most of the code here. When a client connects
 *     to the server and passes initial socket validation checks, it
 *     is owned by this module (auth) which returns it to the rest of the
 *     server when dns and auth queries are finished. Until the client is
 *     released, the server does not know it exists and does not process
 *     any messages from it.
 *     --Bleep  Thomas Helvey <tomh@inxpress.net>
 */

#include "stdinc.h"
#include "list.h"
#include "ircd_defs.h"
#include "fdlist.h"
#include "auth.h"
#include "conf.h"
#include "client.h"
#include "event.h"
#include "irc_string.h"
#include "ircd.h"
#include "packet.h"
#include "res.h"
#include "s_bsd.h"
#include "log.h"
#include "send.h"
#include "mempool.h"


static const char *const HeaderMessages[] =
{
  ":*** Looking up your hostname",
  ":*** Found your hostname",
  ":*** Couldn't look up your hostname",
  ":*** Checking Ident",
  ":*** Got Ident response",
  ":*** No Ident response",
  ":*** Your forward and reverse DNS do not match, ignoring hostname",
  ":*** Your hostname is too long, ignoring hostname"
};

enum
{
  REPORT_DO_DNS,
  REPORT_FIN_DNS,
  REPORT_FAIL_DNS,
  REPORT_DO_ID,
  REPORT_FIN_ID,
  REPORT_FAIL_ID,
  REPORT_IP_MISMATCH,
  REPORT_HOST_TOOLONG
};

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

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


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

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

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

  return request;
}

/*
 * release_auth_client - release auth client from auth system
 * this adds the client into the local client lists so it can be read by
 * the main io processing loop
 */
void
release_auth_client(struct AuthRequest *auth)
{
  struct Client *client = auth->client;

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

  if (IsInAuth(auth))
  {
    dlinkDelete(&auth->node, &auth_pending_list);
    ClearInAuth(auth);
  }

  /*
   * When a client has auth'ed, we want to start reading what it sends
   * us. This is what read_packet() does.
   *     -- adrian
   */
  client->localClient->allow_read = MAX_FLOOD;
  comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);

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

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

/*
 * auth_dns_callback - called when resolver query finishes
 * if the query resulted in a successful search, name will contain
 * a non-NULL pointer, otherwise name will be NULL.
 * set the client on it's way to a connection completion, regardless
 * of success of failure
 */
static void
auth_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name, size_t namelength)
{
  struct AuthRequest *auth = vptr;

  ClearDNSPending(auth);

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

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

      if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
      {
        sendheader(auth->client, REPORT_IP_MISMATCH);
        release_auth_client(auth);
        return;
      }
    }
    else
#endif
    {
      v4 = (const struct sockaddr_in *)&auth->client->localClient->ip;
      v4dns = (const struct sockaddr_in *)addr;

      if (v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
      {
        sendheader(auth->client, REPORT_IP_MISMATCH);
        release_auth_client(auth);
        return;
      }
    }

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

  release_auth_client(auth);
}

/*
 * authsenderr - handle auth send errors
 */
static void
auth_error(struct AuthRequest *auth)
{
  ++ServerStats.is_abad;

  fd_close(&auth->fd);

  ClearAuth(auth);

  sendheader(auth->client, REPORT_FAIL_ID);

  release_auth_client(auth);
}

/*
 * start_auth_query - Flag the client to show that an attempt to
 * contact the ident server on
 * the client's host.  The connect and subsequently the socket are all put
 * into 'non-blocking' mode.  Should the connect or any later phase of the
 * identifing process fail, it is aborted and the user is given a username
 * of "unknown".
 */
static int
start_auth_query(struct AuthRequest *auth)
{
  struct irc_ssaddr localaddr;
  socklen_t locallen = sizeof(struct irc_ssaddr);
#ifdef IPV6
  struct sockaddr_in6 *v6;
#else
  struct sockaddr_in *v4;
#endif

  /* open a socket of the same type as the client socket */
  if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
                SOCK_STREAM, 0, "ident") == -1)
  {
    report_error(L_ALL, "creating auth stream socket %s:%s",
                 get_client_name(auth->client, SHOW_IP), errno);
    ilog(LOG_TYPE_IRCD, "Unable to create auth socket for %s",
        get_client_name(auth->client, SHOW_IP));
    ++ServerStats.is_abad;
    return 0;
  }

  sendheader(auth->client, REPORT_DO_ID);

  /*
   * get the local address of the client and bind to that to
   * make the auth request.  This used to be done only for
   * ifdef VIRTUAL_HOST, but needs to be done for all clients
   * since the ident request must originate from that same address--
   * and machines with multiple IP addresses are common now
   */
  memset(&localaddr, 0, locallen);
  getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
      &locallen);

#ifdef IPV6
  remove_ipv6_mapping(&localaddr);
  v6 = (struct sockaddr_in6 *)&localaddr;
  v6->sin6_port = htons(0);
#else
  localaddr.ss_len = locallen;
  v4 = (struct sockaddr_in *)&localaddr;
  v4->sin_port = htons(0);
#endif
  localaddr.ss_port = htons(0);

  comm_connect_tcp(&auth->fd, auth->client->sockhost, RFC1413_PORT,
      (struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
      auth, auth->client->localClient->ip.ss.ss_family,
      GlobalSetOptions.ident_timeout);
  return 1; /* We suceed here for now */
}

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

  assert(client_p);

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

  sendheader(client_p, REPORT_DO_DNS);

  SetDNSPending(auth);

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

  gethost_byaddr(auth_dns_callback, auth, &client_p->localClient->ip);
}

/*
 * timeout_auth_queries - timeout resolver and identd requests
 * allow clients through if requests failed
 */
static void
timeout_auth_queries_event(void *notused)
{
  dlink_node *ptr = NULL, *ptr_next = NULL;

  DLINK_FOREACH_SAFE(ptr, ptr_next, auth_pending_list.head)
  {
    struct AuthRequest *auth = ptr->data;

    if (auth->timeout > CurrentTime)
      break;

    if (IsDoingAuth(auth))
    {
      ++ServerStats.is_abad;
      fd_close(&auth->fd);
      ClearAuth(auth);
      sendheader(auth->client, REPORT_FAIL_ID);
    }

    if (IsDNSPending(auth))
    {
      delete_resolver_queries(auth);
      ClearDNSPending(auth);
      sendheader(auth->client, REPORT_FAIL_DNS);
    }

    ilog(LOG_TYPE_IRCD, "DNS/AUTH timeout %s",
         get_client_name(auth->client, SHOW_IP));
    release_auth_client(auth);
  }
}

/*
 * auth_connect_callback() - deal with the result of comm_connect_tcp()
 *
 * If the connection failed, we simply close the auth fd and report
 * a failure. If the connection suceeded send the ident server a query
 * giving "theirport , ourport". The write is only attempted *once* so
 * it is deemed to be a fail if the entire write doesn't write all the
 * data given.  This shouldnt be a problem since the socket should have
 * a write buffer far greater than this message to store it in should
 * problems arise. -avalon
 */
static void
auth_connect_callback(fde_t *fd, int error, void *data)
{
  struct AuthRequest *auth = data;
  struct irc_ssaddr us;
  struct irc_ssaddr them;
  char authbuf[32];
  socklen_t ulen = sizeof(struct irc_ssaddr);
  socklen_t tlen = sizeof(struct irc_ssaddr);
  uint16_t uport, tport;
#ifdef IPV6
  struct sockaddr_in6 *v6;
#else
  struct sockaddr_in *v4;
#endif

  if (error != COMM_OK)
  {
    auth_error(auth);
    return;
  }

  if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *)&us, &ulen) ||
      getpeername(auth->client->localClient->fd.fd, (struct sockaddr *)&them, &tlen))
  {
    ilog(LOG_TYPE_IRCD, "auth get{sock,peer}name error for %s",
         get_client_name(auth->client, SHOW_IP));
    auth_error(auth);
    return;
  }

#ifdef IPV6
  v6 = (struct sockaddr_in6 *)&us;
  uport = ntohs(v6->sin6_port);
  v6 = (struct sockaddr_in6 *)&them;
  tport = ntohs(v6->sin6_port);
  remove_ipv6_mapping(&us);
  remove_ipv6_mapping(&them);
#else
  v4 = (struct sockaddr_in *)&us;
  uport = ntohs(v4->sin_port);
  v4 = (struct sockaddr_in *)&them;
  tport = ntohs(v4->sin_port);
  us.ss_len = ulen;
  them.ss_len = tlen;
#endif

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

  if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
  {
    auth_error(auth);
    return;
  }

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

/** Enum used to index ident reply fields in a human-readable way. */
enum IdentReplyFields
{
  IDENT_PORT_NUMBERS,
  IDENT_REPLY_TYPE,
  IDENT_OS_TYPE,
  IDENT_INFO,
  USERID_TOKEN_COUNT
};

/** Parse an ident reply line and extract the userid from it.
 * \param reply The ident reply line.
 * \return The userid, or NULL on parse failure.
 */
static const char *
check_ident_reply(char *reply)
{
  char *token = NULL, *end = NULL;
  char *vector[USERID_TOKEN_COUNT];
  int count = token_vector(reply, ':', vector, USERID_TOKEN_COUNT);

  if (USERID_TOKEN_COUNT != count)
    return NULL;

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

  if (EmptyString(token))
    return NULL;

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

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

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

  if (EmptyString(token))
    return NULL;

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

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

  /*
   * Fourth token is the username
   */
  token = vector[IDENT_INFO];

  if (EmptyString(token))
    return NULL;

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

  while (*token == '~' || *token == '^')
    ++token;

  /*
   * Look for the end of the username, terminators are '\0, @, <SPACE>, :'
   */
  for (end = token; *end; ++end)
    if (IsSpace(*end) || '@' == *end || ':' == *end)
      break;
  *end = '\0';

  return token;
}

/*
 * read_auth_reply - read the reply (if any) from the ident server
 * we connected to.
 * We only give it one shot, if the reply isn't good the first time
 * fail the authentication entirely. --Bleep
 */
static void
read_auth_reply(fde_t *fd, void *data)
{
  struct AuthRequest *auth = data;
  const char *username = NULL;
  ssize_t len = 0;
  char buf[RFC1413_BUFSIZ + 1];

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

  fd_close(fd);

  ClearAuth(auth);

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

  release_auth_client(auth);
}

/*
 * delete_auth()
 */
void
delete_auth(struct AuthRequest *auth)
{
  if (IsDNSPending(auth))
    delete_resolver_queries(auth);

  if (IsDoingAuth(auth))
    fd_close(&auth->fd);

  if (IsInAuth(auth))
  {
    dlinkDelete(&auth->node, &auth_pending_list);
    ClearInAuth(auth);
  }
}

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

  event_add(&timeout_auth_queries, NULL);
}
Revision:	4409
Committed:	Wed Aug 6 21:20:45 2014 UTC (9 years, 8 months ago) by michael
Content type:	text/x-csrc
File size:	14655 byte(s)
Log Message:	- Fixed resolver/auth issues with too long hostnames
#	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			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19			* 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	adx	30	static PF read_auth_reply;
84			static CNCB auth_connect_callback;
85
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	2181	struct AuthRequest *request = &client->localClient->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	992	struct Client *client = auth->client;
112
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			client->localClient->allow_read = MAX_FLOOD;
128			comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
129	michael	650
130	michael	1241	client->localClient->since = CurrentTime;
131			client->localClient->lasttime = CurrentTime;
132			client->localClient->firsttime = CurrentTime;
133	michael	664	client->flags \|= FLAGS_FINISHED_AUTH;
134	michael	650
135	adx	30	read_packet(&client->localClient->fd, client);
136			}
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	992	struct AuthRequest *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	adx	30	#ifdef IPV6
156	michael	992	const struct sockaddr_in6 v6, v6dns;
157	adx	30
158			if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
159			{
160	michael	992	v6 = (const struct sockaddr_in6 *)&auth->client->localClient->ip;
161			v6dns = (const struct sockaddr_in6 *)addr;
162	michael	3250
163	adx	30	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
164			{
165			sendheader(auth->client, REPORT_IP_MISMATCH);
166	michael	4409	release_auth_client(auth);
167			return;
168	adx	30	}
169			}
170			else
171			#endif
172			{
173	michael	992	v4 = (const struct sockaddr_in *)&auth->client->localClient->ip;
174			v4dns = (const struct sockaddr_in *)addr;
175	michael	3250
176			if (v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
177	adx	30	{
178			sendheader(auth->client, REPORT_IP_MISMATCH);
179	michael	4409	release_auth_client(auth);
180			return;
181	adx	30	}
182			}
183	michael	3250
184	michael	4409	if (namelength > HOSTLEN)
185			sendheader(auth->client, REPORT_HOST_TOOLONG);
186			else
187	adx	30	{
188	michael	4409	strlcpy(auth->client->host, name, sizeof(auth->client->host));
189	adx	30	sendheader(auth->client, REPORT_FIN_DNS);
190			}
191			}
192			else
193	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
194	adx	30
195	michael	992	release_auth_client(auth);
196	adx	30	}
197
198			/*
199			* authsenderr - handle auth send errors
200			*/
201			static void
202			auth_error(struct AuthRequest *auth)
203			{
204	michael	896	++ServerStats.is_abad;
205	adx	30
206			fd_close(&auth->fd);
207
208			ClearAuth(auth);
209
210			sendheader(auth->client, REPORT_FAIL_ID);
211
212	michael	992	release_auth_client(auth);
213	adx	30	}
214
215			/*
216	michael	2916	* start_auth_query - Flag the client to show that an attempt to
217	adx	30	* contact the ident server on
218			* the client's host. The connect and subsequently the socket are all put
219			* into 'non-blocking' mode. Should the connect or any later phase of the
220			* identifing process fail, it is aborted and the user is given a username
221			* of "unknown".
222			*/
223			static int
224			start_auth_query(struct AuthRequest *auth)
225			{
226			struct irc_ssaddr localaddr;
227			socklen_t locallen = sizeof(struct irc_ssaddr);
228			#ifdef IPV6
229			struct sockaddr_in6 *v6;
230			#else
231			struct sockaddr_in *v4;
232			#endif
233
234			/* open a socket of the same type as the client socket */
235			if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
236			SOCK_STREAM, 0, "ident") == -1)
237			{
238	michael	2916	report_error(L_ALL, "creating auth stream socket %s:%s",
239			get_client_name(auth->client, SHOW_IP), errno);
240	michael	1247	ilog(LOG_TYPE_IRCD, "Unable to create auth socket for %s",
241	adx	30	get_client_name(auth->client, SHOW_IP));
242	michael	896	++ServerStats.is_abad;
243	adx	30	return 0;
244			}
245
246			sendheader(auth->client, REPORT_DO_ID);
247
248	michael	2916	/*
249	adx	30	* get the local address of the client and bind to that to
250			* make the auth request. This used to be done only for
251			* ifdef VIRTUAL_HOST, but needs to be done for all clients
252			* since the ident request must originate from that same address--
253			* and machines with multiple IP addresses are common now
254			*/
255			memset(&localaddr, 0, locallen);
256			getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
257			&locallen);
258
259			#ifdef IPV6
260			remove_ipv6_mapping(&localaddr);
261			v6 = (struct sockaddr_in6 *)&localaddr;
262			v6->sin6_port = htons(0);
263			#else
264			localaddr.ss_len = locallen;
265			v4 = (struct sockaddr_in *)&localaddr;
266			v4->sin_port = htons(0);
267			#endif
268			localaddr.ss_port = htons(0);
269
270	michael	4310	comm_connect_tcp(&auth->fd, auth->client->sockhost, RFC1413_PORT,
271	michael	2916	(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
272			auth, auth->client->localClient->ip.ss.ss_family,
273	adx	30	GlobalSetOptions.ident_timeout);
274			return 1; /* We suceed here for now */
275			}
276
277			/*
278	michael	2916	* start_auth
279	adx	30	*
280			* inputs - pointer to client to auth
281			* output - NONE
282			* side effects - starts auth (identd) and dns queries for a client
283			*/
284	michael	2916	void
285	michael	3250	start_auth(struct Client *client_p)
286	adx	30	{
287			struct AuthRequest *auth = NULL;
288
289	michael	3250	assert(client_p);
290	adx	30
291	michael	3250	auth = make_auth_request(client_p);
292	michael	2929	SetInAuth(auth);
293	michael	4310	dlinkAddTail(auth, &auth->node, &auth_pending_list);
294	adx	30
295	michael	3250	sendheader(client_p, REPORT_DO_DNS);
296	adx	30
297	michael	992	SetDNSPending(auth);
298
299	michael	4341	if (ConfigGeneral.disable_auth == 0)
300	michael	992	{
301			SetDoingAuth(auth);
302	adx	30	start_auth_query(auth);
303	michael	992	}
304	adx	30
305	michael	3250	gethost_byaddr(auth_dns_callback, auth, &client_p->localClient->ip);
306	adx	30	}
307
308			/*
309			* timeout_auth_queries - timeout resolver and identd requests
310			* allow clients through if requests failed
311			*/
312			static void
313			timeout_auth_queries_event(void *notused)
314			{
315	michael	3250	dlink_node ptr = NULL, ptr_next = NULL;
316	adx	30
317	michael	4310	DLINK_FOREACH_SAFE(ptr, ptr_next, auth_pending_list.head)
318	adx	30	{
319	michael	992	struct AuthRequest *auth = ptr->data;
320	adx	30
321	michael	992	if (auth->timeout > CurrentTime)
322	michael	2929	break;
323	adx	30
324	michael	992	if (IsDoingAuth(auth))
325	michael	2916	{
326	michael	896	++ServerStats.is_abad;
327	michael	1000	fd_close(&auth->fd);
328	michael	998	ClearAuth(auth);
329	adx	30	sendheader(auth->client, REPORT_FAIL_ID);
330	michael	992	}
331	adx	30
332	michael	992	if (IsDNSPending(auth))
333			{
334			delete_resolver_queries(auth);
335	michael	998	ClearDNSPending(auth);
336	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
337			}
338	adx	30
339	michael	1247	ilog(LOG_TYPE_IRCD, "DNS/AUTH timeout %s",
340	michael	992	get_client_name(auth->client, SHOW_IP));
341			release_auth_client(auth);
342	adx	30	}
343			}
344
345			/*
346			* auth_connect_callback() - deal with the result of comm_connect_tcp()
347			*
348			* If the connection failed, we simply close the auth fd and report
349			* a failure. If the connection suceeded send the ident server a query
350			* giving "theirport , ourport". The write is only attempted once so
351			* it is deemed to be a fail if the entire write doesn't write all the
352			* data given. This shouldnt be a problem since the socket should have
353			* a write buffer far greater than this message to store it in should
354			* problems arise. -avalon
355			*/
356			static void
357			auth_connect_callback(fde_t fd, int error, void data)
358			{
359			struct AuthRequest *auth = data;
360			struct irc_ssaddr us;
361			struct irc_ssaddr them;
362			char authbuf[32];
363			socklen_t ulen = sizeof(struct irc_ssaddr);
364			socklen_t tlen = sizeof(struct irc_ssaddr);
365	michael	1032	uint16_t uport, tport;
366	adx	30	#ifdef IPV6
367			struct sockaddr_in6 *v6;
368			#else
369			struct sockaddr_in *v4;
370			#endif
371
372			if (error != COMM_OK)
373			{
374			auth_error(auth);
375			return;
376			}
377
378	michael	3250	if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *)&us, &ulen) \|\|
379			getpeername(auth->client->localClient->fd.fd, (struct sockaddr *)&them, &tlen))
380	adx	30	{
381	michael	1247	ilog(LOG_TYPE_IRCD, "auth get{sock,peer}name error for %s",
382	michael	3250	get_client_name(auth->client, SHOW_IP));
383	adx	30	auth_error(auth);
384			return;
385			}
386
387			#ifdef IPV6
388			v6 = (struct sockaddr_in6 *)&us;
389			uport = ntohs(v6->sin6_port);
390			v6 = (struct sockaddr_in6 *)&them;
391			tport = ntohs(v6->sin6_port);
392			remove_ipv6_mapping(&us);
393			remove_ipv6_mapping(&them);
394			#else
395			v4 = (struct sockaddr_in *)&us;
396			uport = ntohs(v4->sin_port);
397			v4 = (struct sockaddr_in *)&them;
398			tport = ntohs(v4->sin_port);
399			us.ss_len = ulen;
400			them.ss_len = tlen;
401			#endif
402	michael	2916
403	michael	4310	snprintf(authbuf, sizeof(authbuf), "%u, %u\r\n", tport, uport);
404	adx	30
405			if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
406			{
407			auth_error(auth);
408			return;
409			}
410	michael	696
411	michael	4310	comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
412	adx	30	}
413
414	michael	4310	/** Enum used to index ident reply fields in a human-readable way. */
415			enum IdentReplyFields
416			{
417			IDENT_PORT_NUMBERS,
418			IDENT_REPLY_TYPE,
419			IDENT_OS_TYPE,
420			IDENT_INFO,
421			USERID_TOKEN_COUNT
422			};
423
424			/** Parse an ident reply line and extract the userid from it.
425			* \param reply The ident reply line.
426			* \return The userid, or NULL on parse failure.
427			*/
428			static const char *
429			check_ident_reply(char *reply)
430			{
431			char token = NULL, end = NULL;
432			char *vector[USERID_TOKEN_COUNT];
433			int count = token_vector(reply, ':', vector, USERID_TOKEN_COUNT);
434
435			if (USERID_TOKEN_COUNT != count)
436			return NULL;
437
438			/*
439			* Second token is the reply type
440			*/
441			token = vector[IDENT_REPLY_TYPE];
442
443			if (EmptyString(token))
444			return NULL;
445
446			while (IsSpace(*token))
447			++token;
448
449			if (strncmp(token, "USERID", 6))
450			return NULL;
451
452			/*
453			* Third token is the os type
454			*/
455			token = vector[IDENT_OS_TYPE];
456
457			if (EmptyString(token))
458			return NULL;
459
460			while (IsSpace(*token))
461			++token;
462
463			/*
464			* Unless "OTHER" is specified as the operating system type, the server
465			* is expected to return the "normal" user identification of the owner
466			* of this connection. "Normal" in this context may be taken to mean a
467			* string of characters which uniquely identifies the connection owner
468			* such as a user identifier assigned by the system administrator and
469			* used by such user as a mail identifier, or as the "user" part of a
470			* user/password pair used to gain access to system resources. When an
471			* operating system is specified (e.g., anything but "OTHER"), the user
472			* identifier is expected to be in a more or less immediately useful
473			* form - e.g., something that could be used as an argument to "finger"
474			* or as a mail address.
475			*/
476			if (!strncmp(token, "OTHER", 5))
477			return NULL;
478
479			/*
480			* Fourth token is the username
481			*/
482			token = vector[IDENT_INFO];
483
484			if (EmptyString(token))
485			return NULL;
486
487			while (IsSpace(*token))
488			++token;
489
490			while (token == '~' \|\| token == '^')
491			++token;
492
493			/*
494			* Look for the end of the username, terminators are '\0, @, <SPACE>, :'
495			*/
496			for (end = token; *end; ++end)
497			if (IsSpace(end) \|\| '@' == end \|\| ':' == *end)
498			break;
499			*end = '\0';
500
501			return token;
502			}
503
504	adx	30	/*
505	michael	2916	* read_auth_reply - read the reply (if any) from the ident server
506	adx	30	* we connected to.
507			* We only give it one shot, if the reply isn't good the first time
508			* fail the authentication entirely. --Bleep
509			*/
510			static void
511			read_auth_reply(fde_t fd, void data)
512			{
513			struct AuthRequest *auth = data;
514	michael	4310	const char *username = NULL;
515			ssize_t len = 0;
516			char buf[RFC1413_BUFSIZ + 1];
517	adx	30
518	michael	4310	if ((len = recv(fd->fd, buf, RFC1413_BUFSIZ, 0)) > 0)
519	adx	30	{
520			buf[len] = '\0';
521	michael	4310	username = check_ident_reply(buf);
522	adx	30	}
523
524			fd_close(fd);
525
526			ClearAuth(auth);
527
528	michael	4310	if (EmptyString(username))
529	adx	30	{
530			sendheader(auth->client, REPORT_FAIL_ID);
531	michael	896	++ServerStats.is_abad;
532	adx	30	}
533			else
534			{
535	michael	4310	strlcpy(auth->client->username, username, sizeof(auth->client->username));
536	adx	30	sendheader(auth->client, REPORT_FIN_ID);
537	michael	896	++ServerStats.is_asuc;
538	adx	30	SetGotId(auth->client);
539			}
540
541	michael	992	release_auth_client(auth);
542	adx	30	}
543
544			/*
545			* delete_auth()
546			*/
547	michael	2916	void
548	michael	992	delete_auth(struct AuthRequest *auth)
549	adx	30	{
550	michael	992	if (IsDNSPending(auth))
551			delete_resolver_queries(auth);
552	adx	30
553	michael	1000	if (IsDoingAuth(auth))
554			fd_close(&auth->fd);
555
556	michael	2929	if (IsInAuth(auth))
557			{
558	michael	4310	dlinkDelete(&auth->node, &auth_pending_list);
559	michael	2929	ClearInAuth(auth);
560			}
561	adx	30	}
562	michael	4310
563			/* auth_init
564			*
565			* Initialise the auth code
566			*/
567			void
568			auth_init(void)
569			{
570			static struct event timeout_auth_queries =
571			{
572			.name = "timeout_auth_queries_event",
573			.handler = timeout_auth_queries_event,
574			.when = 1
575			};
576
577			event_add(&timeout_auth_queries, NULL);
578			}