trunk/src/auth.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2014 ircd-hybrid development team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 */

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

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

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


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

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

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

static dlink_list auth_doing_list = { NULL, NULL, 0 };

static void timeout_auth_queries_event(void *);

static PF read_auth_reply;
static CNCB auth_connect_callback;

/* 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);
}

/*
 * 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_doing_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)
{
  struct AuthRequest *auth = vptr;

  ClearDNSPending(auth);

  if (name)
  {
    const struct sockaddr_in *v4, *v4dns;
#ifdef IPV6
    const struct sockaddr_in6 *v6, *v6dns;
#endif
    int good = 1;

#ifdef IPV6
    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);
        good = 0;
      }
    }
    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);
        good = 0;
      }
    }

    if (good && strlen(name) <= HOSTLEN)
    {
      strlcpy(auth->client->host, name,
              sizeof(auth->client->host));
      sendheader(auth->client, REPORT_FIN_DNS);
    }
    else if (strlen(name) > HOSTLEN)
      sendheader(auth->client, REPORT_HOST_TOOLONG);
  }
  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, 113,
      (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 */
}

/*
 * GetValidIdent - parse ident query reply from identd server
 *
 * Inputs        - pointer to ident buf
 * Output        - NULL if no valid ident found, otherwise pointer to name
 * Side effects  -
 */
/*
 * A few questions have been asked about this mess, obviously
 * it should have been commented better the first time.
 * The original idea was to remove all references to libc from ircd-hybrid.
 * Instead of having to write a replacement for sscanf(), I did a
 * rather gruseome parser here so we could remove this function call.
 * Note, that I had also removed a few floating point printfs as well (though
 * now we are still stuck with a few...)
 * Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
 * it would have been nice to remove some unneeded code.
 * Oh well. If we don't remove libc stuff totally, then it would be
 * far cleaner to use sscanf()
 *
 * - Dianora
 */
static char *
GetValidIdent(char *buf)
{
  int   remp = 0;
  int   locp = 0;
  char* colon1Ptr;
  char* colon2Ptr;
  char* colon3Ptr;
  char* commaPtr;
  char* remotePortString;

  /* All this to get rid of a sscanf() fun. */
  remotePortString = buf;

  if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
    return 0;
  *colon1Ptr = '\0';
  colon1Ptr++;

  if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
    return 0;
  *colon2Ptr = '\0';
  colon2Ptr++;

  if ((commaPtr = strchr(remotePortString, ',')) == NULL)
    return 0;
  *commaPtr = '\0';
  commaPtr++;

  if ((remp = atoi(remotePortString)) == 0)
    return 0;

  if ((locp = atoi(commaPtr)) == 0)
    return 0;

  /* look for USERID bordered by first pair of colons */
  if (strstr(colon1Ptr, "USERID") == NULL)
    return 0;

  if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
    return 0;
  *colon3Ptr = '\0';
  colon3Ptr++;
  return (colon3Ptr);
}

/*
 * 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_doing_list);

  sendheader(client_p, REPORT_DO_DNS);

  SetDNSPending(auth);

  if (ConfigFileEntry.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_doing_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;
  }

  read_auth_reply(&auth->fd, auth);
}

/*
 * 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
 */
#define AUTH_BUFSIZ 128

static void
read_auth_reply(fde_t *fd, void *data)
{
  struct AuthRequest *auth = data;
  char *s = NULL;
  char *t = NULL;
  int len;
  int count;
  char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */

  /* Why?
   * Well, recv() on many POSIX systems is a per-packet operation,
   * and we do not necessarily want this, because on lowspec machines,
   * the ident response may come back fragmented, thus resulting in an
   * invalid ident response, even if the ident response was really OK.
   *
   * So PLEASE do not change this code to recv without being aware of the
   * consequences.
   *
   *    --nenolod
   */
  len = read(fd->fd, buf, AUTH_BUFSIZ);

  if (len < 0)
  {
    if (ignoreErrno(errno))
      comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
    else
      auth_error(auth);
    return;
  }

  if (len > 0)
  {
    buf[len] = '\0';

    if ((s = GetValidIdent(buf)))
    {
      t = auth->client->username;

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

      for (count = USERLEN; *s && count; s++)
      {
        if (*s == '@')
          break;
        if (!IsSpace(*s) && *s != ':')
        {
          *t++ = *s;
          count--;
        }
      }

      *t = '\0';
    }
  }

  fd_close(fd);

  ClearAuth(auth);

  if (s == NULL)
  {
    sendheader(auth->client, REPORT_FAIL_ID);
    ++ServerStats.is_abad;
  }
  else
  {
    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_doing_list);
    ClearInAuth(auth);
  }
}
Revision:	4189
Committed:	Mon Jul 7 18:30:34 2014 UTC (11 years, 1 month ago) by michael
Content type:	text/x-csrc
File size:	15151 byte(s)
Log Message:	- Don't add/remove unregistered connections to/from global_client_list
#	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	3563	static const char *const HeaderMessages[] =
57	michael	2916	{
58	michael	3168	":*** Looking up your hostname...",
59			":*** Found your hostname",
60			":*** Couldn't look up your hostname",
61			":*** Checking Ident",
62			":*** Got Ident response",
63			":*** No Ident response",
64			":*** Your forward and reverse DNS do not match, ignoring hostname.",
65			":*** Your hostname is too long, ignoring hostname"
66	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	992	static dlink_list auth_doing_list = { NULL, NULL, 0 };
83	adx	30
84	michael	4094	static void timeout_auth_queries_event(void *);
85	adx	30
86			static PF read_auth_reply;
87			static CNCB auth_connect_callback;
88
89	michael	1798	/* auth_init
90	adx	30	*
91			* Initialise the auth code
92			*/
93			void
94	michael	1798	auth_init(void)
95	adx	30	{
96	michael	4094	static struct event timeout_auth_queries =
97			{
98			.name = "timeout_auth_queries_event",
99			.handler = timeout_auth_queries_event,
100			.when = 1
101			};
102
103			event_add(&timeout_auth_queries, NULL);
104	adx	30	}
105
106			/*
107			* make_auth_request - allocate a new auth request
108			*/
109			static struct AuthRequest *
110			make_auth_request(struct Client *client)
111			{
112	michael	2181	struct AuthRequest *request = &client->localClient->auth;
113	adx	30
114	michael	1654	memset(request, 0, sizeof(*request));
115	adx	30
116	michael	2181	request->client = client;
117			request->timeout = CurrentTime + CONNECTTIMEOUT;
118
119	michael	650	return request;
120	adx	30	}
121
122			/*
123			* release_auth_client - release auth client from auth system
124			* this adds the client into the local client lists so it can be read by
125			* the main io processing loop
126			*/
127			void
128	michael	992	release_auth_client(struct AuthRequest *auth)
129	adx	30	{
130	michael	992	struct Client *client = auth->client;
131
132			if (IsDoingAuth(auth) \|\| IsDNSPending(auth))
133			return;
134
135	michael	2929	if (IsInAuth(auth))
136			{
137	michael	2181	dlinkDelete(&auth->node, &auth_doing_list);
138	michael	2929	ClearInAuth(auth);
139			}
140	michael	992
141	adx	30	/*
142			* When a client has auth'ed, we want to start reading what it sends
143			* us. This is what read_packet() does.
144			* -- adrian
145			*/
146			client->localClient->allow_read = MAX_FLOOD;
147			comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
148	michael	650
149	michael	1241	client->localClient->since = CurrentTime;
150			client->localClient->lasttime = CurrentTime;
151			client->localClient->firsttime = CurrentTime;
152	michael	664	client->flags \|= FLAGS_FINISHED_AUTH;
153	michael	650
154	adx	30	read_packet(&client->localClient->fd, client);
155			}
156	michael	2916
157	adx	30	/*
158			* auth_dns_callback - called when resolver query finishes
159	michael	998	* if the query resulted in a successful search, name will contain
160			* a non-NULL pointer, otherwise name will be NULL.
161	adx	30	* set the client on it's way to a connection completion, regardless
162			* of success of failure
163			*/
164			static void
165	michael	992	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name)
166	adx	30	{
167	michael	992	struct AuthRequest *auth = vptr;
168	adx	30
169			ClearDNSPending(auth);
170
171	michael	3250	if (name)
172	adx	30	{
173	michael	992	const struct sockaddr_in v4, v4dns;
174	adx	30	#ifdef IPV6
175	michael	992	const struct sockaddr_in6 v6, v6dns;
176	adx	30	#endif
177			int good = 1;
178
179			#ifdef IPV6
180			if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
181			{
182	michael	992	v6 = (const struct sockaddr_in6 *)&auth->client->localClient->ip;
183			v6dns = (const struct sockaddr_in6 *)addr;
184	michael	3250
185	adx	30	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
186			{
187			sendheader(auth->client, REPORT_IP_MISMATCH);
188			good = 0;
189			}
190			}
191			else
192			#endif
193			{
194	michael	992	v4 = (const struct sockaddr_in *)&auth->client->localClient->ip;
195			v4dns = (const struct sockaddr_in *)addr;
196	michael	3250
197			if (v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
198	adx	30	{
199			sendheader(auth->client, REPORT_IP_MISMATCH);
200			good = 0;
201			}
202			}
203	michael	3250
204	michael	992	if (good && strlen(name) <= HOSTLEN)
205	adx	30	{
206	michael	992	strlcpy(auth->client->host, name,
207	michael	2916	sizeof(auth->client->host));
208	adx	30	sendheader(auth->client, REPORT_FIN_DNS);
209			}
210	michael	992	else if (strlen(name) > HOSTLEN)
211	adx	30	sendheader(auth->client, REPORT_HOST_TOOLONG);
212			}
213			else
214	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
215	adx	30
216	michael	992	release_auth_client(auth);
217	adx	30	}
218
219			/*
220			* authsenderr - handle auth send errors
221			*/
222			static void
223			auth_error(struct AuthRequest *auth)
224			{
225	michael	896	++ServerStats.is_abad;
226	adx	30
227			fd_close(&auth->fd);
228
229			ClearAuth(auth);
230
231			sendheader(auth->client, REPORT_FAIL_ID);
232
233	michael	992	release_auth_client(auth);
234	adx	30	}
235
236			/*
237	michael	2916	* start_auth_query - Flag the client to show that an attempt to
238	adx	30	* contact the ident server on
239			* the client's host. The connect and subsequently the socket are all put
240			* into 'non-blocking' mode. Should the connect or any later phase of the
241			* identifing process fail, it is aborted and the user is given a username
242			* of "unknown".
243			*/
244			static int
245			start_auth_query(struct AuthRequest *auth)
246			{
247			struct irc_ssaddr localaddr;
248			socklen_t locallen = sizeof(struct irc_ssaddr);
249			#ifdef IPV6
250			struct sockaddr_in6 *v6;
251			#else
252			struct sockaddr_in *v4;
253			#endif
254
255			/* open a socket of the same type as the client socket */
256			if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
257			SOCK_STREAM, 0, "ident") == -1)
258			{
259	michael	2916	report_error(L_ALL, "creating auth stream socket %s:%s",
260			get_client_name(auth->client, SHOW_IP), errno);
261	michael	1247	ilog(LOG_TYPE_IRCD, "Unable to create auth socket for %s",
262	adx	30	get_client_name(auth->client, SHOW_IP));
263	michael	896	++ServerStats.is_abad;
264	adx	30	return 0;
265			}
266
267			sendheader(auth->client, REPORT_DO_ID);
268
269	michael	2916	/*
270	adx	30	* get the local address of the client and bind to that to
271			* make the auth request. This used to be done only for
272			* ifdef VIRTUAL_HOST, but needs to be done for all clients
273			* since the ident request must originate from that same address--
274			* and machines with multiple IP addresses are common now
275			*/
276			memset(&localaddr, 0, locallen);
277			getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
278			&locallen);
279
280			#ifdef IPV6
281			remove_ipv6_mapping(&localaddr);
282			v6 = (struct sockaddr_in6 *)&localaddr;
283			v6->sin6_port = htons(0);
284			#else
285			localaddr.ss_len = locallen;
286			v4 = (struct sockaddr_in *)&localaddr;
287			v4->sin_port = htons(0);
288			#endif
289			localaddr.ss_port = htons(0);
290
291	michael	2916	comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
292			(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
293			auth, auth->client->localClient->ip.ss.ss_family,
294	adx	30	GlobalSetOptions.ident_timeout);
295			return 1; /* We suceed here for now */
296			}
297
298			/*
299			* GetValidIdent - parse ident query reply from identd server
300	michael	2916	*
301	adx	30	* Inputs - pointer to ident buf
302			* Output - NULL if no valid ident found, otherwise pointer to name
303			* Side effects -
304			*/
305			/*
306			* A few questions have been asked about this mess, obviously
307			* it should have been commented better the first time.
308			* The original idea was to remove all references to libc from ircd-hybrid.
309			* Instead of having to write a replacement for sscanf(), I did a
310			* rather gruseome parser here so we could remove this function call.
311			* Note, that I had also removed a few floating point printfs as well (though
312			* now we are still stuck with a few...)
313			* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
314			* it would have been nice to remove some unneeded code.
315			* Oh well. If we don't remove libc stuff totally, then it would be
316			* far cleaner to use sscanf()
317			*
318			* - Dianora
319			*/
320			static char *
321			GetValidIdent(char *buf)
322			{
323			int remp = 0;
324			int locp = 0;
325			char* colon1Ptr;
326			char* colon2Ptr;
327			char* colon3Ptr;
328			char* commaPtr;
329			char* remotePortString;
330
331			/* All this to get rid of a sscanf() fun. */
332			remotePortString = buf;
333	michael	2916
334	adx	30	if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
335			return 0;
336			*colon1Ptr = '\0';
337			colon1Ptr++;
338
339			if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
340			return 0;
341			*colon2Ptr = '\0';
342			colon2Ptr++;
343	michael	2916
344	adx	30	if ((commaPtr = strchr(remotePortString, ',')) == NULL)
345			return 0;
346			*commaPtr = '\0';
347			commaPtr++;
348
349			if ((remp = atoi(remotePortString)) == 0)
350			return 0;
351	michael	2916
352	adx	30	if ((locp = atoi(commaPtr)) == 0)
353			return 0;
354
355			/* look for USERID bordered by first pair of colons */
356			if (strstr(colon1Ptr, "USERID") == NULL)
357			return 0;
358
359			if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
360			return 0;
361			*colon3Ptr = '\0';
362			colon3Ptr++;
363			return (colon3Ptr);
364			}
365
366			/*
367	michael	2916	* start_auth
368	adx	30	*
369			* inputs - pointer to client to auth
370			* output - NONE
371			* side effects - starts auth (identd) and dns queries for a client
372			*/
373	michael	2916	void
374	michael	3250	start_auth(struct Client *client_p)
375	adx	30	{
376			struct AuthRequest *auth = NULL;
377
378	michael	3250	assert(client_p);
379	adx	30
380	michael	3250	auth = make_auth_request(client_p);
381	michael	2929	SetInAuth(auth);
382			dlinkAddTail(auth, &auth->node, &auth_doing_list);
383	adx	30
384	michael	3250	sendheader(client_p, REPORT_DO_DNS);
385	adx	30
386	michael	992	SetDNSPending(auth);
387
388	adx	30	if (ConfigFileEntry.disable_auth == 0)
389	michael	992	{
390			SetDoingAuth(auth);
391	adx	30	start_auth_query(auth);
392	michael	992	}
393	adx	30
394	michael	3250	gethost_byaddr(auth_dns_callback, auth, &client_p->localClient->ip);
395	adx	30	}
396
397			/*
398			* timeout_auth_queries - timeout resolver and identd requests
399			* allow clients through if requests failed
400			*/
401			static void
402			timeout_auth_queries_event(void *notused)
403			{
404	michael	3250	dlink_node ptr = NULL, ptr_next = NULL;
405	adx	30
406	michael	3250	DLINK_FOREACH_SAFE(ptr, ptr_next, auth_doing_list.head)
407	adx	30	{
408	michael	992	struct AuthRequest *auth = ptr->data;
409	adx	30
410	michael	992	if (auth->timeout > CurrentTime)
411	michael	2929	break;
412	adx	30
413	michael	992	if (IsDoingAuth(auth))
414	michael	2916	{
415	michael	896	++ServerStats.is_abad;
416	michael	1000	fd_close(&auth->fd);
417	michael	998	ClearAuth(auth);
418	adx	30	sendheader(auth->client, REPORT_FAIL_ID);
419	michael	992	}
420	adx	30
421	michael	992	if (IsDNSPending(auth))
422			{
423			delete_resolver_queries(auth);
424	michael	998	ClearDNSPending(auth);
425	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
426			}
427	adx	30
428	michael	1247	ilog(LOG_TYPE_IRCD, "DNS/AUTH timeout %s",
429	michael	992	get_client_name(auth->client, SHOW_IP));
430			release_auth_client(auth);
431	adx	30	}
432			}
433
434			/*
435			* auth_connect_callback() - deal with the result of comm_connect_tcp()
436			*
437			* If the connection failed, we simply close the auth fd and report
438			* a failure. If the connection suceeded send the ident server a query
439			* giving "theirport , ourport". The write is only attempted once so
440			* it is deemed to be a fail if the entire write doesn't write all the
441			* data given. This shouldnt be a problem since the socket should have
442			* a write buffer far greater than this message to store it in should
443			* problems arise. -avalon
444			*/
445			static void
446			auth_connect_callback(fde_t fd, int error, void data)
447			{
448			struct AuthRequest *auth = data;
449			struct irc_ssaddr us;
450			struct irc_ssaddr them;
451			char authbuf[32];
452			socklen_t ulen = sizeof(struct irc_ssaddr);
453			socklen_t tlen = sizeof(struct irc_ssaddr);
454	michael	1032	uint16_t uport, tport;
455	adx	30	#ifdef IPV6
456			struct sockaddr_in6 *v6;
457			#else
458			struct sockaddr_in *v4;
459			#endif
460
461			if (error != COMM_OK)
462			{
463			auth_error(auth);
464			return;
465			}
466
467	michael	3250	if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *)&us, &ulen) \|\|
468			getpeername(auth->client->localClient->fd.fd, (struct sockaddr *)&them, &tlen))
469	adx	30	{
470	michael	1247	ilog(LOG_TYPE_IRCD, "auth get{sock,peer}name error for %s",
471	michael	3250	get_client_name(auth->client, SHOW_IP));
472	adx	30	auth_error(auth);
473			return;
474			}
475
476			#ifdef IPV6
477			v6 = (struct sockaddr_in6 *)&us;
478			uport = ntohs(v6->sin6_port);
479			v6 = (struct sockaddr_in6 *)&them;
480			tport = ntohs(v6->sin6_port);
481			remove_ipv6_mapping(&us);
482			remove_ipv6_mapping(&them);
483			#else
484			v4 = (struct sockaddr_in *)&us;
485			uport = ntohs(v4->sin_port);
486			v4 = (struct sockaddr_in *)&them;
487			tport = ntohs(v4->sin_port);
488			us.ss_len = ulen;
489			them.ss_len = tlen;
490			#endif
491	michael	2916
492	michael	1124	snprintf(authbuf, sizeof(authbuf), "%u , %u\r\n", tport, uport);
493	adx	30
494			if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
495			{
496			auth_error(auth);
497			return;
498			}
499	michael	696
500	adx	30	read_auth_reply(&auth->fd, auth);
501			}
502
503			/*
504	michael	2916	* read_auth_reply - read the reply (if any) from the ident server
505	adx	30	* we connected to.
506			* We only give it one shot, if the reply isn't good the first time
507			* fail the authentication entirely. --Bleep
508			*/
509			#define AUTH_BUFSIZ 128
510
511			static void
512			read_auth_reply(fde_t fd, void data)
513			{
514			struct AuthRequest *auth = data;
515			char *s = NULL;
516			char *t = NULL;
517			int len;
518			int count;
519			char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
520
521	nenolod	397	/* Why?
522			* Well, recv() on many POSIX systems is a per-packet operation,
523			* and we do not necessarily want this, because on lowspec machines,
524			* the ident response may come back fragmented, thus resulting in an
525			* invalid ident response, even if the ident response was really OK.
526			*
527			* So PLEASE do not change this code to recv without being aware of the
528			* consequences.
529			*
530			* --nenolod
531			*/
532			len = read(fd->fd, buf, AUTH_BUFSIZ);
533	michael	1001
534	adx	30	if (len < 0)
535			{
536			if (ignoreErrno(errno))
537			comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
538			else
539			auth_error(auth);
540			return;
541			}
542
543			if (len > 0)
544			{
545			buf[len] = '\0';
546
547			if ((s = GetValidIdent(buf)))
548			{
549			t = auth->client->username;
550
551			while (s == '~' \|\| s == '^')
552			s++;
553
554			for (count = USERLEN; *s && count; s++)
555			{
556			if (*s == '@')
557			break;
558	michael	4108	if (!IsSpace(s) && s != ':')
559	adx	30	{
560			t++ = s;
561			count--;
562			}
563			}
564
565			*t = '\0';
566			}
567			}
568
569			fd_close(fd);
570
571			ClearAuth(auth);
572
573			if (s == NULL)
574			{
575			sendheader(auth->client, REPORT_FAIL_ID);
576	michael	896	++ServerStats.is_abad;
577	adx	30	}
578			else
579			{
580			sendheader(auth->client, REPORT_FIN_ID);
581	michael	896	++ServerStats.is_asuc;
582	adx	30	SetGotId(auth->client);
583			}
584
585	michael	992	release_auth_client(auth);
586	adx	30	}
587
588			/*
589			* delete_auth()
590			*/
591	michael	2916	void
592	michael	992	delete_auth(struct AuthRequest *auth)
593	adx	30	{
594	michael	992	if (IsDNSPending(auth))
595			delete_resolver_queries(auth);
596	adx	30
597	michael	1000	if (IsDoingAuth(auth))
598			fd_close(&auth->fd);
599
600	michael	2929	if (IsInAuth(auth))
601			{
602	michael	2181	dlinkDelete(&auth->node, &auth_doing_list);
603	michael	2929	ClearInAuth(auth);
604			}
605	adx	30	}