trunk/src/s_auth.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  s_auth.c: Functions for querying a users ident.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  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
 *
 *  $Id$
 */

/*
 * 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 "s_auth.h"
#include "conf.h"
#include "client.h"
#include "event.h"
#include "hook.h"
#include "irc_string.h"
#include "ircd.h"
#include "packet.h"
#include "irc_res.h"
#include "s_bsd.h"
#include "log.h"
#include "send.h"
#include "mempool.h"


static const char *HeaderMessages[] = {
  ":%s NOTICE AUTH :*** Looking up your hostname...",
  ":%s NOTICE AUTH :*** Found your hostname",
  ":%s NOTICE AUTH :*** Couldn't look up your hostname",
  ":%s NOTICE AUTH :*** Checking Ident",
  ":%s NOTICE AUTH :*** Got Ident response",
  ":%s NOTICE AUTH :*** No Ident response",
  ":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.",
  ":%s NOTICE AUTH :*** 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((c), HeaderMessages[(i)], me.name)

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

static EVH timeout_auth_queries_event;

static PF read_auth_reply;
static CNCB auth_connect_callback;

/* auth_init
 *
 * Initialise the auth code
 */
void
auth_init(void)
{
  eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
}

/*
 * 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 (dlinkFind(&auth_doing_list, auth))
    dlinkDelete(&auth->node, &auth_doing_list);

  /*
   * 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);

  dlinkAdd(client, &client->node, &global_client_list);

  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 != NULL)
  {
    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)
{
  struct AuthRequest *auth = NULL;

  assert(client != NULL);

  auth = make_auth_request(client);
  dlinkAdd(auth, &auth->node, &auth_doing_list);

  sendheader(client, REPORT_DO_DNS);

  SetDNSPending(auth);

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

  gethost_byaddr(auth_dns_callback, auth, &client->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, *next_ptr = NULL;

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

    if (auth->timeout > CurrentTime)
      continue;

    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 != ':' && *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 (dlinkFind(&auth_doing_list, auth))
    dlinkDelete(&auth->node, &auth_doing_list);
}
Revision:	2181
Committed:	Tue Jun 4 11:03:41 2013 UTC (12 years, 2 months ago) by michael
Content type:	text/x-csrc
File size:	15207 byte(s)
Log Message:	- Fixed debug assertion being triggered on ident lookup as reported by Stuart Walsh
#	User	Rev	Content
1	adx	30	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* s_auth.c: Functions for querying a users ident.
4			*
5			* Copyright (C) 2002 by the past and present ircd coders, and others.
6			*
7			* This program is free software; you can redistribute it and/or modify
8			* it under the terms of the GNU General Public License as published by
9			* the Free Software Foundation; either version 2 of the License, or
10			* (at your option) any later version.
11			*
12			* This program is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			* GNU General Public License for more details.
16			*
17			* You should have received a copy of the GNU General Public License
18			* along with this program; if not, write to the Free Software
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20			* USA
21			*
22	knight	31	* $Id$
23	adx	30	*/
24
25			/*
26			* Changes:
27			* July 6, 1999 - Rewrote most of the code here. When a client connects
28			* to the server and passes initial socket validation checks, it
29			* is owned by this module (auth) which returns it to the rest of the
30			* server when dns and auth queries are finished. Until the client is
31			* released, the server does not know it exists and does not process
32			* any messages from it.
33			* --Bleep Thomas Helvey <tomh@inxpress.net>
34			*/
35	michael	1309
36	adx	30	#include "stdinc.h"
37			#include "list.h"
38	michael	1011	#include "ircd_defs.h"
39			#include "fdlist.h"
40	adx	30	#include "s_auth.h"
41	michael	1309	#include "conf.h"
42	adx	30	#include "client.h"
43			#include "event.h"
44			#include "hook.h"
45			#include "irc_string.h"
46			#include "ircd.h"
47			#include "packet.h"
48			#include "irc_res.h"
49			#include "s_bsd.h"
50	michael	1309	#include "log.h"
51	adx	30	#include "send.h"
52	michael	1654	#include "mempool.h"
53	adx	30
54	michael	1011
55	adx	30	static const char *HeaderMessages[] = {
56			":%s NOTICE AUTH :*** Looking up your hostname...",
57			":%s NOTICE AUTH :*** Found your hostname",
58			":%s NOTICE AUTH :*** Couldn't look up your hostname",
59			":%s NOTICE AUTH :*** Checking Ident",
60			":%s NOTICE AUTH :*** Got Ident response",
61			":%s NOTICE AUTH :*** No Ident response",
62			":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.",
63			":%s NOTICE AUTH :*** Your hostname is too long, ignoring hostname"
64			};
65
66			enum {
67			REPORT_DO_DNS,
68			REPORT_FIN_DNS,
69			REPORT_FAIL_DNS,
70			REPORT_DO_ID,
71			REPORT_FIN_ID,
72			REPORT_FAIL_ID,
73			REPORT_IP_MISMATCH,
74			REPORT_HOST_TOOLONG
75			};
76
77			#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name)
78
79	michael	992	static dlink_list auth_doing_list = { NULL, NULL, 0 };
80	adx	30
81			static EVH timeout_auth_queries_event;
82
83			static PF read_auth_reply;
84			static CNCB auth_connect_callback;
85
86	michael	1798	/* auth_init
87	adx	30	*
88			* Initialise the auth code
89			*/
90			void
91	michael	1798	auth_init(void)
92	adx	30	{
93			eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
94			}
95
96			/*
97			* make_auth_request - allocate a new auth request
98			*/
99			static struct AuthRequest *
100			make_auth_request(struct Client *client)
101			{
102	michael	2181	struct AuthRequest *request = &client->localClient->auth;
103	adx	30
104	michael	1654	memset(request, 0, sizeof(*request));
105	adx	30
106	michael	2181	request->client = client;
107			request->timeout = CurrentTime + CONNECTTIMEOUT;
108
109	michael	650	return request;
110	adx	30	}
111
112			/*
113			* release_auth_client - release auth client from auth system
114			* this adds the client into the local client lists so it can be read by
115			* the main io processing loop
116			*/
117			void
118	michael	992	release_auth_client(struct AuthRequest *auth)
119	adx	30	{
120	michael	992	struct Client *client = auth->client;
121
122			if (IsDoingAuth(auth) \|\| IsDNSPending(auth))
123			return;
124
125	michael	2181	if (dlinkFind(&auth_doing_list, auth))
126			dlinkDelete(&auth->node, &auth_doing_list);
127	michael	992
128	adx	30	/*
129			* When a client has auth'ed, we want to start reading what it sends
130			* us. This is what read_packet() does.
131			* -- adrian
132			*/
133			client->localClient->allow_read = MAX_FLOOD;
134			comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
135	michael	650
136	michael	992	dlinkAdd(client, &client->node, &global_client_list);
137	michael	650
138	michael	1241	client->localClient->since = CurrentTime;
139			client->localClient->lasttime = CurrentTime;
140			client->localClient->firsttime = CurrentTime;
141	michael	664	client->flags \|= FLAGS_FINISHED_AUTH;
142	michael	650
143	adx	30	read_packet(&client->localClient->fd, client);
144			}
145
146			/*
147			* auth_dns_callback - called when resolver query finishes
148	michael	998	* if the query resulted in a successful search, name will contain
149			* a non-NULL pointer, otherwise name will be NULL.
150	adx	30	* set the client on it's way to a connection completion, regardless
151			* of success of failure
152			*/
153			static void
154	michael	992	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name)
155	adx	30	{
156	michael	992	struct AuthRequest *auth = vptr;
157	adx	30
158			ClearDNSPending(auth);
159
160	michael	992	if (name != NULL)
161	adx	30	{
162	michael	992	const struct sockaddr_in v4, v4dns;
163	adx	30	#ifdef IPV6
164	michael	992	const struct sockaddr_in6 v6, v6dns;
165	adx	30	#endif
166			int good = 1;
167
168			#ifdef IPV6
169			if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
170			{
171	michael	992	v6 = (const struct sockaddr_in6 *)&auth->client->localClient->ip;
172			v6dns = (const struct sockaddr_in6 *)addr;
173	adx	30	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
174			{
175			sendheader(auth->client, REPORT_IP_MISMATCH);
176			good = 0;
177			}
178			}
179			else
180			#endif
181			{
182	michael	992	v4 = (const struct sockaddr_in *)&auth->client->localClient->ip;
183			v4dns = (const struct sockaddr_in *)addr;
184	adx	30	if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
185			{
186			sendheader(auth->client, REPORT_IP_MISMATCH);
187			good = 0;
188			}
189			}
190	michael	992	if (good && strlen(name) <= HOSTLEN)
191	adx	30	{
192	michael	992	strlcpy(auth->client->host, name,
193	adx	30	sizeof(auth->client->host));
194			sendheader(auth->client, REPORT_FIN_DNS);
195			}
196	michael	992	else if (strlen(name) > HOSTLEN)
197	adx	30	sendheader(auth->client, REPORT_HOST_TOOLONG);
198			}
199			else
200	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
201	adx	30
202	michael	992	release_auth_client(auth);
203	adx	30	}
204
205			/*
206			* authsenderr - handle auth send errors
207			*/
208			static void
209			auth_error(struct AuthRequest *auth)
210			{
211	michael	896	++ServerStats.is_abad;
212	adx	30
213			fd_close(&auth->fd);
214
215			ClearAuth(auth);
216
217			sendheader(auth->client, REPORT_FAIL_ID);
218
219	michael	992	release_auth_client(auth);
220	adx	30	}
221
222			/*
223			* start_auth_query - Flag the client to show that an attempt to
224			* contact the ident server on
225			* the client's host. The connect and subsequently the socket are all put
226			* into 'non-blocking' mode. Should the connect or any later phase of the
227			* identifing process fail, it is aborted and the user is given a username
228			* of "unknown".
229			*/
230			static int
231			start_auth_query(struct AuthRequest *auth)
232			{
233			struct irc_ssaddr localaddr;
234			socklen_t locallen = sizeof(struct irc_ssaddr);
235			#ifdef IPV6
236			struct sockaddr_in6 *v6;
237			#else
238			struct sockaddr_in *v4;
239			#endif
240
241			/* open a socket of the same type as the client socket */
242			if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
243			SOCK_STREAM, 0, "ident") == -1)
244			{
245			report_error(L_ALL, "creating auth stream socket %s:%s",
246			get_client_name(auth->client, SHOW_IP), errno);
247	michael	1247	ilog(LOG_TYPE_IRCD, "Unable to create auth socket for %s",
248	adx	30	get_client_name(auth->client, SHOW_IP));
249	michael	896	++ServerStats.is_abad;
250	adx	30	return 0;
251			}
252
253			sendheader(auth->client, REPORT_DO_ID);
254
255			/*
256			* get the local address of the client and bind to that to
257			* make the auth request. This used to be done only for
258			* ifdef VIRTUAL_HOST, but needs to be done for all clients
259			* since the ident request must originate from that same address--
260			* and machines with multiple IP addresses are common now
261			*/
262			memset(&localaddr, 0, locallen);
263			getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
264			&locallen);
265
266			#ifdef IPV6
267			remove_ipv6_mapping(&localaddr);
268			v6 = (struct sockaddr_in6 *)&localaddr;
269			v6->sin6_port = htons(0);
270			#else
271			localaddr.ss_len = locallen;
272			v4 = (struct sockaddr_in *)&localaddr;
273			v4->sin_port = htons(0);
274			#endif
275			localaddr.ss_port = htons(0);
276
277			comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
278			(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
279			auth, auth->client->localClient->ip.ss.ss_family,
280			GlobalSetOptions.ident_timeout);
281			return 1; /* We suceed here for now */
282			}
283
284			/*
285			* GetValidIdent - parse ident query reply from identd server
286			*
287			* Inputs - pointer to ident buf
288			* Output - NULL if no valid ident found, otherwise pointer to name
289			* Side effects -
290			*/
291			/*
292			* A few questions have been asked about this mess, obviously
293			* it should have been commented better the first time.
294			* The original idea was to remove all references to libc from ircd-hybrid.
295			* Instead of having to write a replacement for sscanf(), I did a
296			* rather gruseome parser here so we could remove this function call.
297			* Note, that I had also removed a few floating point printfs as well (though
298			* now we are still stuck with a few...)
299			* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
300			* it would have been nice to remove some unneeded code.
301			* Oh well. If we don't remove libc stuff totally, then it would be
302			* far cleaner to use sscanf()
303			*
304			* - Dianora
305			*/
306			static char *
307			GetValidIdent(char *buf)
308			{
309			int remp = 0;
310			int locp = 0;
311			char* colon1Ptr;
312			char* colon2Ptr;
313			char* colon3Ptr;
314			char* commaPtr;
315			char* remotePortString;
316
317			/* All this to get rid of a sscanf() fun. */
318			remotePortString = buf;
319
320			if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
321			return 0;
322			*colon1Ptr = '\0';
323			colon1Ptr++;
324
325			if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
326			return 0;
327			*colon2Ptr = '\0';
328			colon2Ptr++;
329
330			if ((commaPtr = strchr(remotePortString, ',')) == NULL)
331			return 0;
332			*commaPtr = '\0';
333			commaPtr++;
334
335			if ((remp = atoi(remotePortString)) == 0)
336			return 0;
337
338			if ((locp = atoi(commaPtr)) == 0)
339			return 0;
340
341			/* look for USERID bordered by first pair of colons */
342			if (strstr(colon1Ptr, "USERID") == NULL)
343			return 0;
344
345			if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
346			return 0;
347			*colon3Ptr = '\0';
348			colon3Ptr++;
349			return (colon3Ptr);
350			}
351
352			/*
353			* start_auth
354			*
355			* inputs - pointer to client to auth
356			* output - NONE
357			* side effects - starts auth (identd) and dns queries for a client
358			*/
359	michael	2181	void
360			start_auth(struct Client *client)
361	adx	30	{
362			struct AuthRequest *auth = NULL;
363
364			assert(client != NULL);
365
366			auth = make_auth_request(client);
367	michael	1000	dlinkAdd(auth, &auth->node, &auth_doing_list);
368	adx	30
369			sendheader(client, REPORT_DO_DNS);
370
371	michael	992	SetDNSPending(auth);
372
373	adx	30	if (ConfigFileEntry.disable_auth == 0)
374	michael	992	{
375			SetDoingAuth(auth);
376	adx	30	start_auth_query(auth);
377	michael	992	}
378	adx	30
379	michael	992	gethost_byaddr(auth_dns_callback, auth, &client->localClient->ip);
380	adx	30	}
381
382			/*
383			* timeout_auth_queries - timeout resolver and identd requests
384			* allow clients through if requests failed
385			*/
386			static void
387			timeout_auth_queries_event(void *notused)
388			{
389	michael	992	dlink_node ptr = NULL, next_ptr = NULL;
390	adx	30
391	michael	992	DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_list.head)
392	adx	30	{
393	michael	992	struct AuthRequest *auth = ptr->data;
394	adx	30
395	michael	992	if (auth->timeout > CurrentTime)
396			continue;
397	adx	30
398	michael	992	if (IsDoingAuth(auth))
399			{
400	michael	896	++ServerStats.is_abad;
401	michael	1000	fd_close(&auth->fd);
402	michael	998	ClearAuth(auth);
403	adx	30	sendheader(auth->client, REPORT_FAIL_ID);
404	michael	992	}
405	adx	30
406	michael	992	if (IsDNSPending(auth))
407			{
408			delete_resolver_queries(auth);
409	michael	998	ClearDNSPending(auth);
410	michael	992	sendheader(auth->client, REPORT_FAIL_DNS);
411			}
412	adx	30
413	michael	1247	ilog(LOG_TYPE_IRCD, "DNS/AUTH timeout %s",
414	michael	992	get_client_name(auth->client, SHOW_IP));
415			release_auth_client(auth);
416	adx	30	}
417			}
418
419			/*
420			* auth_connect_callback() - deal with the result of comm_connect_tcp()
421			*
422			* If the connection failed, we simply close the auth fd and report
423			* a failure. If the connection suceeded send the ident server a query
424			* giving "theirport , ourport". The write is only attempted once so
425			* it is deemed to be a fail if the entire write doesn't write all the
426			* data given. This shouldnt be a problem since the socket should have
427			* a write buffer far greater than this message to store it in should
428			* problems arise. -avalon
429			*/
430			static void
431			auth_connect_callback(fde_t fd, int error, void data)
432			{
433			struct AuthRequest *auth = data;
434			struct irc_ssaddr us;
435			struct irc_ssaddr them;
436			char authbuf[32];
437			socklen_t ulen = sizeof(struct irc_ssaddr);
438			socklen_t tlen = sizeof(struct irc_ssaddr);
439	michael	1032	uint16_t uport, tport;
440	adx	30	#ifdef IPV6
441			struct sockaddr_in6 *v6;
442			#else
443			struct sockaddr_in *v4;
444			#endif
445
446			if (error != COMM_OK)
447			{
448			auth_error(auth);
449			return;
450			}
451
452	michael	1013	if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *)&us,
453			&ulen) \|\|
454			getpeername(auth->client->localClient->fd.fd, (struct sockaddr *)&them,
455			&tlen))
456	adx	30	{
457	michael	1247	ilog(LOG_TYPE_IRCD, "auth get{sock,peer}name error for %s",
458	adx	30	get_client_name(auth->client, SHOW_IP));
459			auth_error(auth);
460			return;
461			}
462
463			#ifdef IPV6
464			v6 = (struct sockaddr_in6 *)&us;
465			uport = ntohs(v6->sin6_port);
466			v6 = (struct sockaddr_in6 *)&them;
467			tport = ntohs(v6->sin6_port);
468			remove_ipv6_mapping(&us);
469			remove_ipv6_mapping(&them);
470			#else
471			v4 = (struct sockaddr_in *)&us;
472			uport = ntohs(v4->sin_port);
473			v4 = (struct sockaddr_in *)&them;
474			tport = ntohs(v4->sin_port);
475			us.ss_len = ulen;
476			them.ss_len = tlen;
477			#endif
478
479	michael	1124	snprintf(authbuf, sizeof(authbuf), "%u , %u\r\n", tport, uport);
480	adx	30
481			if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
482			{
483			auth_error(auth);
484			return;
485			}
486	michael	696
487	adx	30	read_auth_reply(&auth->fd, auth);
488			}
489
490			/*
491			* read_auth_reply - read the reply (if any) from the ident server
492			* we connected to.
493			* We only give it one shot, if the reply isn't good the first time
494			* fail the authentication entirely. --Bleep
495			*/
496			#define AUTH_BUFSIZ 128
497
498			static void
499			read_auth_reply(fde_t fd, void data)
500			{
501			struct AuthRequest *auth = data;
502			char *s = NULL;
503			char *t = NULL;
504			int len;
505			int count;
506			char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
507
508	nenolod	397	/* Why?
509			* Well, recv() on many POSIX systems is a per-packet operation,
510			* and we do not necessarily want this, because on lowspec machines,
511			* the ident response may come back fragmented, thus resulting in an
512			* invalid ident response, even if the ident response was really OK.
513			*
514			* So PLEASE do not change this code to recv without being aware of the
515			* consequences.
516			*
517			* --nenolod
518			*/
519			len = read(fd->fd, buf, AUTH_BUFSIZ);
520	michael	1001
521	adx	30	if (len < 0)
522			{
523			if (ignoreErrno(errno))
524			comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
525			else
526			auth_error(auth);
527			return;
528			}
529
530			if (len > 0)
531			{
532			buf[len] = '\0';
533
534			if ((s = GetValidIdent(buf)))
535			{
536			t = auth->client->username;
537
538			while (s == '~' \|\| s == '^')
539			s++;
540
541			for (count = USERLEN; *s && count; s++)
542			{
543			if (*s == '@')
544			break;
545			if (!IsSpace(s) && s != ':' && *s != '[')
546			{
547			t++ = s;
548			count--;
549			}
550			}
551
552			*t = '\0';
553			}
554			}
555
556			fd_close(fd);
557
558			ClearAuth(auth);
559
560			if (s == NULL)
561			{
562			sendheader(auth->client, REPORT_FAIL_ID);
563	michael	896	++ServerStats.is_abad;
564	adx	30	}
565			else
566			{
567			sendheader(auth->client, REPORT_FIN_ID);
568	michael	896	++ServerStats.is_asuc;
569	adx	30	SetGotId(auth->client);
570			}
571
572	michael	992	release_auth_client(auth);
573	adx	30	}
574
575			/*
576			* delete_auth()
577			*/
578			void
579	michael	992	delete_auth(struct AuthRequest *auth)
580	adx	30	{
581	michael	992	if (IsDNSPending(auth))
582			delete_resolver_queries(auth);
583	adx	30
584	michael	1000	if (IsDoingAuth(auth))
585			fd_close(&auth->fd);
586
587	michael	2181	if (dlinkFind(&auth_doing_list, auth))
588			dlinkDelete(&auth->node, &auth_doing_list);
589	adx	30	}