ircd-hybrid/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 "s_auth.h"
#include "s_conf.h"
#include "client.h"
#include "common.h"
#include "ircd.h"
#include "numeric.h"
#include "packet.h"
#include "send.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)

/*
 * Ok, the original was confusing.
 * Now there are two lists, an auth request can be on both at the same time
 * or only on one or the other.
 * - Dianora
 */
static dlink_list auth_doing_dns_list   = { NULL, NULL, 0 };
static dlink_list auth_doing_ident_list = { NULL, NULL, 0 };

static EVH timeout_auth_queries_event;

static PF read_auth_reply;
static CNCB auth_connect_callback;
static CBFUNC start_auth;

struct Callback *auth_cb = NULL;

/* init_auth()
 *
 * Initialise the auth code
 */
void
init_auth(void)
{
  auth_cb = register_callback("start_auth", start_auth);
  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 = MyMalloc(sizeof(struct AuthRequest));

  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 Client *client)
{
  /*
   * 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_p->flags |= FLAGS_FINISHED_AUTH;
  client_p->since = client_p->lasttime = client_p->firsttime = CurrentTime;

  dlinkAdd(client, &client->node, &global_client_list);
  read_packet(&client->localClient->fd, client);
}
 
/*
 * auth_dns_callback - called when resolver query finishes
 * if the query resulted in a successful search, hp will contain
 * a non-null pointer, otherwise hp 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, struct DNSReply *reply)
{
  struct AuthRequest *auth = (struct AuthRequest *)vptr;

  dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
  ClearDNSPending(auth);

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

#ifdef IPV6
    if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
    {
      v6 = (struct sockaddr_in6 *)&auth->client->localClient->ip;
      v6dns = (struct sockaddr_in6 *)&reply->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 = (struct sockaddr_in *)&auth->client->localClient->ip;
      v4dns = (struct sockaddr_in *)&reply->addr;
      if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
      {
        sendheader(auth->client, REPORT_IP_MISMATCH);
        good = 0;
      }
    }
    if (good && strlen(reply->h_name) <= HOSTLEN)
    {
      strlcpy(auth->client->host, reply->h_name,
              sizeof(auth->client->host));
      sendheader(auth->client, REPORT_FIN_DNS);
    }
    else if (strlen(reply->h_name) > HOSTLEN)
      sendheader(auth->client, REPORT_HOST_TOOLONG);
  }
  else
      sendheader(auth->client, REPORT_FAIL_DNS);

  MyFree(auth->client->localClient->dns_query);
  auth->client->localClient->dns_query = NULL;

  if (!IsDoingAuth(auth))
  {
    struct Client *client_p = auth->client;
    MyFree(auth);
    release_auth_client(client_p);
  }
}

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

  fd_close(&auth->fd);

  dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
  ClearAuth(auth);

  sendheader(auth->client, REPORT_FAIL_ID);

  if (!IsDNSPending(auth) && !IsCrit(auth))
  {
    release_auth_client(auth->client);
    MyFree(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(L_ERROR, "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);

  SetDoingAuth(auth);
  dlinkAdd(auth, &auth->ident_node, &auth_doing_ident_list);

  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
 */
static void *
start_auth(va_list args)
{
  struct Client *client = va_arg(args, struct Client *);
  struct AuthRequest *auth = NULL;

  assert(client != NULL);

  auth = make_auth_request(client);
  SetCrit(auth);

  client->localClient->dns_query = MyMalloc(sizeof(struct DNSQuery));
  client->localClient->dns_query->ptr = auth;
  client->localClient->dns_query->callback = auth_dns_callback;

  sendheader(client, REPORT_DO_DNS);

  if (ConfigFileEntry.disable_auth == 0)
    start_auth_query(auth);

  /* auth order changed, before gethost_byaddr can immediately call
   * dns callback under win32 when the lookup cannot be started.
   * And that would do MyFree(auth) etc -adx */
  SetDNSPending(auth);
  dlinkAdd(auth, &auth->dns_node, &auth_doing_dns_list);
  ClearCrit(auth);
  gethost_byaddr(&client->localClient->ip, client->localClient->dns_query);

  return NULL;
}

/*
 * 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;
  dlink_node *next_ptr;
  struct AuthRequest* auth;

  DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
  {
    auth = ptr->data;

    if (auth->timeout <= CurrentTime)
    {
      fd_close(&auth->fd);

      ++ServerStats.is_abad;
      sendheader(auth->client, REPORT_FAIL_ID);

      if (IsDNSPending(auth))
      {
        struct Client *client_p = auth->client;

        dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
        if (client_p->localClient->dns_query != NULL)
        {
          delete_resolver_queries(client_p->localClient->dns_query);
          MyFree(client_p->localClient->dns_query);
        }
        auth->client->localClient->dns_query = NULL;
        sendheader(client_p, REPORT_FAIL_DNS);
      }

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

      dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
      release_auth_client(auth->client);
      MyFree(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);
  u_int16_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,
      (socklen_t *) &ulen) ||
      getpeername(auth->client->localClient->fd.fd, (struct sockaddr *) &them,
      (socklen_t *) &tlen))
  {
    ilog(L_INFO, "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
  
  ircsprintf(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
   */
#ifndef _WIN32
  len = read(fd->fd, buf, AUTH_BUFSIZ);
#else
  len = recv(fd->fd, buf, AUTH_BUFSIZ, 0);  
#endif

  if (len < 0)
  {
#ifdef _WIN32
    errno = WSAGetLastError();
#endif
    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);

  dlinkDelete(&auth->ident_node, &auth_doing_ident_list);  
  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);
  }

  if (!IsDNSPending(auth) && !IsCrit(auth))
  {
    release_auth_client(auth->client);
    MyFree(auth);
  }
}

/*
 * delete_auth()
 */
void 
delete_auth(struct Client *target_p)
{
  dlink_node *ptr;
  dlink_node *next_ptr;
  struct AuthRequest *auth;

  if (!IsUnknown(target_p))
    return;

  if (target_p->localClient->dns_query != NULL)
    DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_dns_list.head)
    {
      auth = ptr->data;

      if (auth->client == target_p)
      {
        delete_resolver_queries(target_p->localClient->dns_query);

        dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
        if (!IsDoingAuth(auth))
        {
          MyFree(auth);
          return;
        }
      }
    }

  DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
  {
    auth = ptr->data;

    if (auth->client == target_p)
    {
      fd_close(&auth->fd);

      dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
      MyFree(auth);
    }
  }
}
Revision:	651
Committed:	Thu Jun 8 07:38:56 2006 UTC (20 years, 2 months ago) by michael
Content type:	text/x-csrc
File size:	17169 byte(s)
Log Message:	- Backported r650 (clients are exited in check_unknowsn_list() while still processing auth/dns) - Changed Client::flags to 64bit integer type to allow more flags
#	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			#include "stdinc.h"
36			#include "s_auth.h"
37			#include "s_conf.h"
38			#include "client.h"
39			#include "common.h"
40			#include "ircd.h"
41			#include "numeric.h"
42			#include "packet.h"
43			#include "send.h"
44
45			static const char *HeaderMessages[] = {
46			":%s NOTICE AUTH :*** Looking up your hostname...",
47			":%s NOTICE AUTH :*** Found your hostname",
48			":%s NOTICE AUTH :*** Couldn't look up your hostname",
49			":%s NOTICE AUTH :*** Checking Ident",
50			":%s NOTICE AUTH :*** Got Ident response",
51			":%s NOTICE AUTH :*** No Ident response",
52			":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.",
53			":%s NOTICE AUTH :*** Your hostname is too long, ignoring hostname"
54			};
55
56			enum {
57			REPORT_DO_DNS,
58			REPORT_FIN_DNS,
59			REPORT_FAIL_DNS,
60			REPORT_DO_ID,
61			REPORT_FIN_ID,
62			REPORT_FAIL_ID,
63			REPORT_IP_MISMATCH,
64			REPORT_HOST_TOOLONG
65			};
66
67			#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name)
68
69			/*
70			* Ok, the original was confusing.
71			* Now there are two lists, an auth request can be on both at the same time
72			* or only on one or the other.
73			* - Dianora
74			*/
75			static dlink_list auth_doing_dns_list = { NULL, NULL, 0 };
76			static dlink_list auth_doing_ident_list = { NULL, NULL, 0 };
77
78			static EVH timeout_auth_queries_event;
79
80			static PF read_auth_reply;
81			static CNCB auth_connect_callback;
82			static CBFUNC start_auth;
83
84			struct Callback *auth_cb = NULL;
85
86			/* init_auth()
87			*
88			* Initialise the auth code
89			*/
90			void
91			init_auth(void)
92			{
93			auth_cb = register_callback("start_auth", start_auth);
94			eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
95			}
96
97			/*
98			* make_auth_request - allocate a new auth request
99			*/
100			static struct AuthRequest *
101			make_auth_request(struct Client *client)
102			{
103			struct AuthRequest *request = MyMalloc(sizeof(struct AuthRequest));
104
105			request->client = client;
106			request->timeout = CurrentTime + CONNECTTIMEOUT;
107
108	michael	651	return request;
109	adx	30	}
110
111			/*
112			* release_auth_client - release auth client from auth system
113			* this adds the client into the local client lists so it can be read by
114			* the main io processing loop
115			*/
116			void
117			release_auth_client(struct Client *client)
118			{
119			/*
120			* When a client has auth'ed, we want to start reading what it sends
121			* us. This is what read_packet() does.
122			* -- adrian
123			*/
124			client->localClient->allow_read = MAX_FLOOD;
125			comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
126	michael	651
127			client_p->flags \|= FLAGS_FINISHED_AUTH;
128			client_p->since = client_p->lasttime = client_p->firsttime = CurrentTime;
129
130			dlinkAdd(client, &client->node, &global_client_list);
131	adx	30	read_packet(&client->localClient->fd, client);
132			}
133
134			/*
135			* auth_dns_callback - called when resolver query finishes
136			* if the query resulted in a successful search, hp will contain
137			* a non-null pointer, otherwise hp will be null.
138			* set the client on it's way to a connection completion, regardless
139			* of success of failure
140			*/
141			static void
142			auth_dns_callback(void vptr, struct DNSReply reply)
143			{
144			struct AuthRequest auth = (struct AuthRequest )vptr;
145
146			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
147			ClearDNSPending(auth);
148
149			if (reply != NULL)
150			{
151			struct sockaddr_in v4, v4dns;
152			#ifdef IPV6
153			struct sockaddr_in6 v6, v6dns;
154			#endif
155			int good = 1;
156
157			#ifdef IPV6
158			if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
159			{
160			v6 = (struct sockaddr_in6 *)&auth->client->localClient->ip;
161			v6dns = (struct sockaddr_in6 *)&reply->addr;
162			if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
163			{
164			sendheader(auth->client, REPORT_IP_MISMATCH);
165			good = 0;
166			}
167			}
168			else
169			#endif
170			{
171			v4 = (struct sockaddr_in *)&auth->client->localClient->ip;
172			v4dns = (struct sockaddr_in *)&reply->addr;
173			if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
174			{
175			sendheader(auth->client, REPORT_IP_MISMATCH);
176			good = 0;
177			}
178			}
179			if (good && strlen(reply->h_name) <= HOSTLEN)
180			{
181			strlcpy(auth->client->host, reply->h_name,
182			sizeof(auth->client->host));
183			sendheader(auth->client, REPORT_FIN_DNS);
184			}
185			else if (strlen(reply->h_name) > HOSTLEN)
186			sendheader(auth->client, REPORT_HOST_TOOLONG);
187			}
188			else
189			sendheader(auth->client, REPORT_FAIL_DNS);
190
191			MyFree(auth->client->localClient->dns_query);
192			auth->client->localClient->dns_query = NULL;
193
194			if (!IsDoingAuth(auth))
195			{
196			struct Client *client_p = auth->client;
197			MyFree(auth);
198			release_auth_client(client_p);
199			}
200			}
201
202			/*
203			* authsenderr - handle auth send errors
204			*/
205			static void
206			auth_error(struct AuthRequest *auth)
207			{
208	michael	515	++ServerStats.is_abad;
209	adx	30
210			fd_close(&auth->fd);
211
212			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
213			ClearAuth(auth);
214
215			sendheader(auth->client, REPORT_FAIL_ID);
216
217			if (!IsDNSPending(auth) && !IsCrit(auth))
218			{
219			release_auth_client(auth->client);
220			MyFree(auth);
221			}
222			}
223
224			/*
225			* start_auth_query - Flag the client to show that an attempt to
226			* contact the ident server on
227			* the client's host. The connect and subsequently the socket are all put
228			* into 'non-blocking' mode. Should the connect or any later phase of the
229			* identifing process fail, it is aborted and the user is given a username
230			* of "unknown".
231			*/
232			static int
233			start_auth_query(struct AuthRequest *auth)
234			{
235			struct irc_ssaddr localaddr;
236			socklen_t locallen = sizeof(struct irc_ssaddr);
237			#ifdef IPV6
238			struct sockaddr_in6 *v6;
239			#else
240			struct sockaddr_in *v4;
241			#endif
242
243			/* open a socket of the same type as the client socket */
244			if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
245			SOCK_STREAM, 0, "ident") == -1)
246			{
247			report_error(L_ALL, "creating auth stream socket %s:%s",
248			get_client_name(auth->client, SHOW_IP), errno);
249			ilog(L_ERROR, "Unable to create auth socket for %s",
250			get_client_name(auth->client, SHOW_IP));
251	michael	515	++ServerStats.is_abad;
252	adx	30	return 0;
253			}
254
255			sendheader(auth->client, REPORT_DO_ID);
256
257			/*
258			* get the local address of the client and bind to that to
259			* make the auth request. This used to be done only for
260			* ifdef VIRTUAL_HOST, but needs to be done for all clients
261			* since the ident request must originate from that same address--
262			* and machines with multiple IP addresses are common now
263			*/
264			memset(&localaddr, 0, locallen);
265			getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
266			&locallen);
267
268			#ifdef IPV6
269			remove_ipv6_mapping(&localaddr);
270			v6 = (struct sockaddr_in6 *)&localaddr;
271			v6->sin6_port = htons(0);
272			#else
273			localaddr.ss_len = locallen;
274			v4 = (struct sockaddr_in *)&localaddr;
275			v4->sin_port = htons(0);
276			#endif
277			localaddr.ss_port = htons(0);
278
279			SetDoingAuth(auth);
280			dlinkAdd(auth, &auth->ident_node, &auth_doing_ident_list);
281
282			comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
283			(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
284			auth, auth->client->localClient->ip.ss.ss_family,
285			GlobalSetOptions.ident_timeout);
286			return 1; /* We suceed here for now */
287			}
288
289			/*
290			* GetValidIdent - parse ident query reply from identd server
291			*
292			* Inputs - pointer to ident buf
293			* Output - NULL if no valid ident found, otherwise pointer to name
294			* Side effects -
295			*/
296			/*
297			* A few questions have been asked about this mess, obviously
298			* it should have been commented better the first time.
299			* The original idea was to remove all references to libc from ircd-hybrid.
300			* Instead of having to write a replacement for sscanf(), I did a
301			* rather gruseome parser here so we could remove this function call.
302			* Note, that I had also removed a few floating point printfs as well (though
303			* now we are still stuck with a few...)
304			* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
305			* it would have been nice to remove some unneeded code.
306			* Oh well. If we don't remove libc stuff totally, then it would be
307			* far cleaner to use sscanf()
308			*
309			* - Dianora
310			*/
311			static char *
312			GetValidIdent(char *buf)
313			{
314			int remp = 0;
315			int locp = 0;
316			char* colon1Ptr;
317			char* colon2Ptr;
318			char* colon3Ptr;
319			char* commaPtr;
320			char* remotePortString;
321
322			/* All this to get rid of a sscanf() fun. */
323			remotePortString = buf;
324
325			if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
326			return 0;
327			*colon1Ptr = '\0';
328			colon1Ptr++;
329
330			if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
331			return 0;
332			*colon2Ptr = '\0';
333			colon2Ptr++;
334
335			if ((commaPtr = strchr(remotePortString, ',')) == NULL)
336			return 0;
337			*commaPtr = '\0';
338			commaPtr++;
339
340			if ((remp = atoi(remotePortString)) == 0)
341			return 0;
342
343			if ((locp = atoi(commaPtr)) == 0)
344			return 0;
345
346			/* look for USERID bordered by first pair of colons */
347			if (strstr(colon1Ptr, "USERID") == NULL)
348			return 0;
349
350			if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
351			return 0;
352			*colon3Ptr = '\0';
353			colon3Ptr++;
354			return (colon3Ptr);
355			}
356
357			/*
358			* start_auth
359			*
360			* inputs - pointer to client to auth
361			* output - NONE
362			* side effects - starts auth (identd) and dns queries for a client
363			*/
364			static void *
365			start_auth(va_list args)
366			{
367			struct Client client = va_arg(args, struct Client );
368			struct AuthRequest *auth = NULL;
369
370			assert(client != NULL);
371
372			auth = make_auth_request(client);
373			SetCrit(auth);
374
375			client->localClient->dns_query = MyMalloc(sizeof(struct DNSQuery));
376			client->localClient->dns_query->ptr = auth;
377			client->localClient->dns_query->callback = auth_dns_callback;
378
379			sendheader(client, REPORT_DO_DNS);
380
381			if (ConfigFileEntry.disable_auth == 0)
382			start_auth_query(auth);
383
384			/* auth order changed, before gethost_byaddr can immediately call
385			* dns callback under win32 when the lookup cannot be started.
386			* And that would do MyFree(auth) etc -adx */
387			SetDNSPending(auth);
388			dlinkAdd(auth, &auth->dns_node, &auth_doing_dns_list);
389			ClearCrit(auth);
390			gethost_byaddr(&client->localClient->ip, client->localClient->dns_query);
391
392			return NULL;
393			}
394
395			/*
396			* timeout_auth_queries - timeout resolver and identd requests
397			* allow clients through if requests failed
398			*/
399			static void
400			timeout_auth_queries_event(void *notused)
401			{
402			dlink_node *ptr;
403			dlink_node *next_ptr;
404			struct AuthRequest* auth;
405
406			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
407			{
408			auth = ptr->data;
409
410			if (auth->timeout <= CurrentTime)
411			{
412			fd_close(&auth->fd);
413
414	michael	515	++ServerStats.is_abad;
415	adx	30	sendheader(auth->client, REPORT_FAIL_ID);
416
417			if (IsDNSPending(auth))
418			{
419			struct Client *client_p = auth->client;
420
421			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
422			if (client_p->localClient->dns_query != NULL)
423			{
424			delete_resolver_queries(client_p->localClient->dns_query);
425			MyFree(client_p->localClient->dns_query);
426			}
427			auth->client->localClient->dns_query = NULL;
428			sendheader(client_p, REPORT_FAIL_DNS);
429			}
430
431			ilog(L_INFO, "DNS/AUTH timeout %s",
432			get_client_name(auth->client, SHOW_IP));
433
434			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
435			release_auth_client(auth->client);
436			MyFree(auth);
437			}
438			}
439			}
440
441			/*
442			* auth_connect_callback() - deal with the result of comm_connect_tcp()
443			*
444			* If the connection failed, we simply close the auth fd and report
445			* a failure. If the connection suceeded send the ident server a query
446			* giving "theirport , ourport". The write is only attempted once so
447			* it is deemed to be a fail if the entire write doesn't write all the
448			* data given. This shouldnt be a problem since the socket should have
449			* a write buffer far greater than this message to store it in should
450			* problems arise. -avalon
451			*/
452			static void
453			auth_connect_callback(fde_t fd, int error, void data)
454			{
455			struct AuthRequest *auth = data;
456			struct irc_ssaddr us;
457			struct irc_ssaddr them;
458			char authbuf[32];
459			socklen_t ulen = sizeof(struct irc_ssaddr);
460			socklen_t tlen = sizeof(struct irc_ssaddr);
461			u_int16_t uport, tport;
462			#ifdef IPV6
463			struct sockaddr_in6 *v6;
464			#else
465			struct sockaddr_in *v4;
466			#endif
467
468			if (error != COMM_OK)
469			{
470			auth_error(auth);
471			return;
472			}
473
474			if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *) &us,
475			(socklen_t *) &ulen) \|\|
476			getpeername(auth->client->localClient->fd.fd, (struct sockaddr *) &them,
477			(socklen_t *) &tlen))
478			{
479			ilog(L_INFO, "auth get{sock,peer}name error for %s",
480			get_client_name(auth->client, SHOW_IP));
481			auth_error(auth);
482			return;
483			}
484
485			#ifdef IPV6
486			v6 = (struct sockaddr_in6 *)&us;
487			uport = ntohs(v6->sin6_port);
488			v6 = (struct sockaddr_in6 *)&them;
489			tport = ntohs(v6->sin6_port);
490			remove_ipv6_mapping(&us);
491			remove_ipv6_mapping(&them);
492			#else
493			v4 = (struct sockaddr_in *)&us;
494			uport = ntohs(v4->sin_port);
495			v4 = (struct sockaddr_in *)&them;
496			tport = ntohs(v4->sin_port);
497			us.ss_len = ulen;
498			them.ss_len = tlen;
499			#endif
500
501			ircsprintf(authbuf, "%u , %u\r\n", tport, uport);
502
503			if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
504			{
505			auth_error(auth);
506			return;
507			}
508			read_auth_reply(&auth->fd, auth);
509			}
510
511			/*
512			* read_auth_reply - read the reply (if any) from the ident server
513			* we connected to.
514			* We only give it one shot, if the reply isn't good the first time
515			* fail the authentication entirely. --Bleep
516			*/
517			#define AUTH_BUFSIZ 128
518
519			static void
520			read_auth_reply(fde_t fd, void data)
521			{
522			struct AuthRequest *auth = data;
523			char *s = NULL;
524			char *t = NULL;
525			int len;
526			int count;
527			char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
528
529	nenolod	396	/* Why?
530			* Well, recv() on many POSIX systems is a per-packet operation,
531			* and we do not necessarily want this, because on lowspec machines,
532			* the ident response may come back fragmented, thus resulting in an
533			* invalid ident response, even if the ident response was really OK.
534			*
535			* So PLEASE do not change this code to recv without being aware of the
536			* consequences.
537			*
538			* --nenolod
539			*/
540			#ifndef _WIN32
541			len = read(fd->fd, buf, AUTH_BUFSIZ);
542			#else
543			len = recv(fd->fd, buf, AUTH_BUFSIZ, 0);
544			#endif
545
546	adx	30	if (len < 0)
547			{
548			#ifdef _WIN32
549			errno = WSAGetLastError();
550			#endif
551			if (ignoreErrno(errno))
552			comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
553			else
554			auth_error(auth);
555			return;
556			}
557
558			if (len > 0)
559			{
560			buf[len] = '\0';
561
562			if ((s = GetValidIdent(buf)))
563			{
564			t = auth->client->username;
565
566			while (s == '~' \|\| s == '^')
567			s++;
568
569			for (count = USERLEN; *s && count; s++)
570			{
571			if (*s == '@')
572			break;
573			if (!IsSpace(s) && s != ':' && *s != '[')
574			{
575			t++ = s;
576			count--;
577			}
578			}
579
580			*t = '\0';
581			}
582			}
583
584			fd_close(fd);
585
586			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
587			ClearAuth(auth);
588
589			if (s == NULL)
590			{
591			sendheader(auth->client, REPORT_FAIL_ID);
592	michael	515	++ServerStats.is_abad;
593	adx	30	}
594			else
595			{
596			sendheader(auth->client, REPORT_FIN_ID);
597	michael	515	++ServerStats.is_asuc;
598	adx	30	SetGotId(auth->client);
599			}
600
601			if (!IsDNSPending(auth) && !IsCrit(auth))
602			{
603			release_auth_client(auth->client);
604			MyFree(auth);
605			}
606			}
607
608			/*
609			* delete_auth()
610			*/
611			void
612			delete_auth(struct Client *target_p)
613			{
614			dlink_node *ptr;
615			dlink_node *next_ptr;
616			struct AuthRequest *auth;
617
618			if (!IsUnknown(target_p))
619			return;
620
621			if (target_p->localClient->dns_query != NULL)
622			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_dns_list.head)
623			{
624			auth = ptr->data;
625
626			if (auth->client == target_p)
627			{
628			delete_resolver_queries(target_p->localClient->dns_query);
629
630			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
631			if (!IsDoingAuth(auth))
632			{
633			MyFree(auth);
634			return;
635			}
636			}
637			}
638
639			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
640			{
641			auth = ptr->data;
642
643			if (auth->client == target_p)
644			{
645			fd_close(&auth->fd);
646
647			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
648			MyFree(auth);
649			}
650			}
651			}