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);
  if ((client->node.prev != NULL) || (client->node.next != NULL))
  {
    sendto_realops_flags(UMODE_ALL, L_OPER,
                         "already linked %s at %s:%d", client->name,
                         __FILE__, __LINE__);
    ilog(L_ERROR, "already linked %s at %s:%d", client->name,
         __FILE__, __LINE__);
    assert(0==5);
  }
  else
    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:	515
Committed:	Sun Mar 5 09:26:04 2006 UTC (19 years, 5 months ago) by michael
Content type:	text/x-csrc
File size:	17354 byte(s)
Log Message:	- Moved tstats() to m_stats.c and killed s_stats.(c\|h) - Got rid of extra ServerStats pointer - Killed ms_error which was basically a duplication of m_error
#	Content
1	/*
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	* $Id$
23	*/
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	return (request);
109	}
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	if ((client->node.prev != NULL) \|\| (client->node.next != NULL))
127	{
128	sendto_realops_flags(UMODE_ALL, L_OPER,
129	"already linked %s at %s:%d", client->name,
130	__FILE__, __LINE__);
131	ilog(L_ERROR, "already linked %s at %s:%d", client->name,
132	__FILE__, __LINE__);
133	assert(0==5);
134	}
135	else
136	dlinkAdd(client, &client->node, &global_client_list);
137	read_packet(&client->localClient->fd, client);
138	}
139
140	/*
141	* auth_dns_callback - called when resolver query finishes
142	* if the query resulted in a successful search, hp will contain
143	* a non-null pointer, otherwise hp will be null.
144	* set the client on it's way to a connection completion, regardless
145	* of success of failure
146	*/
147	static void
148	auth_dns_callback(void vptr, struct DNSReply reply)
149	{
150	struct AuthRequest auth = (struct AuthRequest )vptr;
151
152	dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
153	ClearDNSPending(auth);
154
155	if (reply != NULL)
156	{
157	struct sockaddr_in v4, v4dns;
158	#ifdef IPV6
159	struct sockaddr_in6 v6, v6dns;
160	#endif
161	int good = 1;
162
163	#ifdef IPV6
164	if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
165	{
166	v6 = (struct sockaddr_in6 *)&auth->client->localClient->ip;
167	v6dns = (struct sockaddr_in6 *)&reply->addr;
168	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
169	{
170	sendheader(auth->client, REPORT_IP_MISMATCH);
171	good = 0;
172	}
173	}
174	else
175	#endif
176	{
177	v4 = (struct sockaddr_in *)&auth->client->localClient->ip;
178	v4dns = (struct sockaddr_in *)&reply->addr;
179	if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
180	{
181	sendheader(auth->client, REPORT_IP_MISMATCH);
182	good = 0;
183	}
184	}
185	if (good && strlen(reply->h_name) <= HOSTLEN)
186	{
187	strlcpy(auth->client->host, reply->h_name,
188	sizeof(auth->client->host));
189	sendheader(auth->client, REPORT_FIN_DNS);
190	}
191	else if (strlen(reply->h_name) > HOSTLEN)
192	sendheader(auth->client, REPORT_HOST_TOOLONG);
193	}
194	else
195	sendheader(auth->client, REPORT_FAIL_DNS);
196
197	MyFree(auth->client->localClient->dns_query);
198	auth->client->localClient->dns_query = NULL;
199
200	if (!IsDoingAuth(auth))
201	{
202	struct Client *client_p = auth->client;
203	MyFree(auth);
204	release_auth_client(client_p);
205	}
206	}
207
208	/*
209	* authsenderr - handle auth send errors
210	*/
211	static void
212	auth_error(struct AuthRequest *auth)
213	{
214	++ServerStats.is_abad;
215
216	fd_close(&auth->fd);
217
218	dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
219	ClearAuth(auth);
220
221	sendheader(auth->client, REPORT_FAIL_ID);
222
223	if (!IsDNSPending(auth) && !IsCrit(auth))
224	{
225	release_auth_client(auth->client);
226	MyFree(auth);
227	}
228	}
229
230	/*
231	* start_auth_query - Flag the client to show that an attempt to
232	* contact the ident server on
233	* the client's host. The connect and subsequently the socket are all put
234	* into 'non-blocking' mode. Should the connect or any later phase of the
235	* identifing process fail, it is aborted and the user is given a username
236	* of "unknown".
237	*/
238	static int
239	start_auth_query(struct AuthRequest *auth)
240	{
241	struct irc_ssaddr localaddr;
242	socklen_t locallen = sizeof(struct irc_ssaddr);
243	#ifdef IPV6
244	struct sockaddr_in6 *v6;
245	#else
246	struct sockaddr_in *v4;
247	#endif
248
249	/* open a socket of the same type as the client socket */
250	if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
251	SOCK_STREAM, 0, "ident") == -1)
252	{
253	report_error(L_ALL, "creating auth stream socket %s:%s",
254	get_client_name(auth->client, SHOW_IP), errno);
255	ilog(L_ERROR, "Unable to create auth socket for %s",
256	get_client_name(auth->client, SHOW_IP));
257	++ServerStats.is_abad;
258	return 0;
259	}
260
261	sendheader(auth->client, REPORT_DO_ID);
262
263	/*
264	* get the local address of the client and bind to that to
265	* make the auth request. This used to be done only for
266	* ifdef VIRTUAL_HOST, but needs to be done for all clients
267	* since the ident request must originate from that same address--
268	* and machines with multiple IP addresses are common now
269	*/
270	memset(&localaddr, 0, locallen);
271	getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
272	&locallen);
273
274	#ifdef IPV6
275	remove_ipv6_mapping(&localaddr);
276	v6 = (struct sockaddr_in6 *)&localaddr;
277	v6->sin6_port = htons(0);
278	#else
279	localaddr.ss_len = locallen;
280	v4 = (struct sockaddr_in *)&localaddr;
281	v4->sin_port = htons(0);
282	#endif
283	localaddr.ss_port = htons(0);
284
285	SetDoingAuth(auth);
286	dlinkAdd(auth, &auth->ident_node, &auth_doing_ident_list);
287
288	comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
289	(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
290	auth, auth->client->localClient->ip.ss.ss_family,
291	GlobalSetOptions.ident_timeout);
292	return 1; /* We suceed here for now */
293	}
294
295	/*
296	* GetValidIdent - parse ident query reply from identd server
297	*
298	* Inputs - pointer to ident buf
299	* Output - NULL if no valid ident found, otherwise pointer to name
300	* Side effects -
301	*/
302	/*
303	* A few questions have been asked about this mess, obviously
304	* it should have been commented better the first time.
305	* The original idea was to remove all references to libc from ircd-hybrid.
306	* Instead of having to write a replacement for sscanf(), I did a
307	* rather gruseome parser here so we could remove this function call.
308	* Note, that I had also removed a few floating point printfs as well (though
309	* now we are still stuck with a few...)
310	* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
311	* it would have been nice to remove some unneeded code.
312	* Oh well. If we don't remove libc stuff totally, then it would be
313	* far cleaner to use sscanf()
314	*
315	* - Dianora
316	*/
317	static char *
318	GetValidIdent(char *buf)
319	{
320	int remp = 0;
321	int locp = 0;
322	char* colon1Ptr;
323	char* colon2Ptr;
324	char* colon3Ptr;
325	char* commaPtr;
326	char* remotePortString;
327
328	/* All this to get rid of a sscanf() fun. */
329	remotePortString = buf;
330
331	if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
332	return 0;
333	*colon1Ptr = '\0';
334	colon1Ptr++;
335
336	if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
337	return 0;
338	*colon2Ptr = '\0';
339	colon2Ptr++;
340
341	if ((commaPtr = strchr(remotePortString, ',')) == NULL)
342	return 0;
343	*commaPtr = '\0';
344	commaPtr++;
345
346	if ((remp = atoi(remotePortString)) == 0)
347	return 0;
348
349	if ((locp = atoi(commaPtr)) == 0)
350	return 0;
351
352	/* look for USERID bordered by first pair of colons */
353	if (strstr(colon1Ptr, "USERID") == NULL)
354	return 0;
355
356	if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
357	return 0;
358	*colon3Ptr = '\0';
359	colon3Ptr++;
360	return (colon3Ptr);
361	}
362
363	/*
364	* start_auth
365	*
366	* inputs - pointer to client to auth
367	* output - NONE
368	* side effects - starts auth (identd) and dns queries for a client
369	*/
370	static void *
371	start_auth(va_list args)
372	{
373	struct Client client = va_arg(args, struct Client );
374	struct AuthRequest *auth = NULL;
375
376	assert(client != NULL);
377
378	auth = make_auth_request(client);
379	SetCrit(auth);
380
381	client->localClient->dns_query = MyMalloc(sizeof(struct DNSQuery));
382	client->localClient->dns_query->ptr = auth;
383	client->localClient->dns_query->callback = auth_dns_callback;
384
385	sendheader(client, REPORT_DO_DNS);
386
387	if (ConfigFileEntry.disable_auth == 0)
388	start_auth_query(auth);
389
390	/* auth order changed, before gethost_byaddr can immediately call
391	* dns callback under win32 when the lookup cannot be started.
392	* And that would do MyFree(auth) etc -adx */
393	SetDNSPending(auth);
394	dlinkAdd(auth, &auth->dns_node, &auth_doing_dns_list);
395	ClearCrit(auth);
396	gethost_byaddr(&client->localClient->ip, client->localClient->dns_query);
397
398	return NULL;
399	}
400
401	/*
402	* timeout_auth_queries - timeout resolver and identd requests
403	* allow clients through if requests failed
404	*/
405	static void
406	timeout_auth_queries_event(void *notused)
407	{
408	dlink_node *ptr;
409	dlink_node *next_ptr;
410	struct AuthRequest* auth;
411
412	DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
413	{
414	auth = ptr->data;
415
416	if (auth->timeout <= CurrentTime)
417	{
418	fd_close(&auth->fd);
419
420	++ServerStats.is_abad;
421	sendheader(auth->client, REPORT_FAIL_ID);
422
423	if (IsDNSPending(auth))
424	{
425	struct Client *client_p = auth->client;
426
427	dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
428	if (client_p->localClient->dns_query != NULL)
429	{
430	delete_resolver_queries(client_p->localClient->dns_query);
431	MyFree(client_p->localClient->dns_query);
432	}
433	auth->client->localClient->dns_query = NULL;
434	sendheader(client_p, REPORT_FAIL_DNS);
435	}
436
437	ilog(L_INFO, "DNS/AUTH timeout %s",
438	get_client_name(auth->client, SHOW_IP));
439
440	dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
441	release_auth_client(auth->client);
442	MyFree(auth);
443	}
444	}
445	}
446
447	/*
448	* auth_connect_callback() - deal with the result of comm_connect_tcp()
449	*
450	* If the connection failed, we simply close the auth fd and report
451	* a failure. If the connection suceeded send the ident server a query
452	* giving "theirport , ourport". The write is only attempted once so
453	* it is deemed to be a fail if the entire write doesn't write all the
454	* data given. This shouldnt be a problem since the socket should have
455	* a write buffer far greater than this message to store it in should
456	* problems arise. -avalon
457	*/
458	static void
459	auth_connect_callback(fde_t fd, int error, void data)
460	{
461	struct AuthRequest *auth = data;
462	struct irc_ssaddr us;
463	struct irc_ssaddr them;
464	char authbuf[32];
465	socklen_t ulen = sizeof(struct irc_ssaddr);
466	socklen_t tlen = sizeof(struct irc_ssaddr);
467	u_int16_t uport, tport;
468	#ifdef IPV6
469	struct sockaddr_in6 *v6;
470	#else
471	struct sockaddr_in *v4;
472	#endif
473
474	if (error != COMM_OK)
475	{
476	auth_error(auth);
477	return;
478	}
479
480	if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *) &us,
481	(socklen_t *) &ulen) \|\|
482	getpeername(auth->client->localClient->fd.fd, (struct sockaddr *) &them,
483	(socklen_t *) &tlen))
484	{
485	ilog(L_INFO, "auth get{sock,peer}name error for %s",
486	get_client_name(auth->client, SHOW_IP));
487	auth_error(auth);
488	return;
489	}
490
491	#ifdef IPV6
492	v6 = (struct sockaddr_in6 *)&us;
493	uport = ntohs(v6->sin6_port);
494	v6 = (struct sockaddr_in6 *)&them;
495	tport = ntohs(v6->sin6_port);
496	remove_ipv6_mapping(&us);
497	remove_ipv6_mapping(&them);
498	#else
499	v4 = (struct sockaddr_in *)&us;
500	uport = ntohs(v4->sin_port);
501	v4 = (struct sockaddr_in *)&them;
502	tport = ntohs(v4->sin_port);
503	us.ss_len = ulen;
504	them.ss_len = tlen;
505	#endif
506
507	ircsprintf(authbuf, "%u , %u\r\n", tport, uport);
508
509	if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
510	{
511	auth_error(auth);
512	return;
513	}
514	read_auth_reply(&auth->fd, auth);
515	}
516
517	/*
518	* read_auth_reply - read the reply (if any) from the ident server
519	* we connected to.
520	* We only give it one shot, if the reply isn't good the first time
521	* fail the authentication entirely. --Bleep
522	*/
523	#define AUTH_BUFSIZ 128
524
525	static void
526	read_auth_reply(fde_t fd, void data)
527	{
528	struct AuthRequest *auth = data;
529	char *s = NULL;
530	char *t = NULL;
531	int len;
532	int count;
533	char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
534
535	/* Why?
536	* Well, recv() on many POSIX systems is a per-packet operation,
537	* and we do not necessarily want this, because on lowspec machines,
538	* the ident response may come back fragmented, thus resulting in an
539	* invalid ident response, even if the ident response was really OK.
540	*
541	* So PLEASE do not change this code to recv without being aware of the
542	* consequences.
543	*
544	* --nenolod
545	*/
546	#ifndef _WIN32
547	len = read(fd->fd, buf, AUTH_BUFSIZ);
548	#else
549	len = recv(fd->fd, buf, AUTH_BUFSIZ, 0);
550	#endif
551
552	if (len < 0)
553	{
554	#ifdef _WIN32
555	errno = WSAGetLastError();
556	#endif
557	if (ignoreErrno(errno))
558	comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
559	else
560	auth_error(auth);
561	return;
562	}
563
564	if (len > 0)
565	{
566	buf[len] = '\0';
567
568	if ((s = GetValidIdent(buf)))
569	{
570	t = auth->client->username;
571
572	while (s == '~' \|\| s == '^')
573	s++;
574
575	for (count = USERLEN; *s && count; s++)
576	{
577	if (*s == '@')
578	break;
579	if (!IsSpace(s) && s != ':' && *s != '[')
580	{
581	t++ = s;
582	count--;
583	}
584	}
585
586	*t = '\0';
587	}
588	}
589
590	fd_close(fd);
591
592	dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
593	ClearAuth(auth);
594
595	if (s == NULL)
596	{
597	sendheader(auth->client, REPORT_FAIL_ID);
598	++ServerStats.is_abad;
599	}
600	else
601	{
602	sendheader(auth->client, REPORT_FIN_ID);
603	++ServerStats.is_asuc;
604	SetGotId(auth->client);
605	}
606
607	if (!IsDNSPending(auth) && !IsCrit(auth))
608	{
609	release_auth_client(auth->client);
610	MyFree(auth);
611	}
612	}
613
614	/*
615	* delete_auth()
616	*/
617	void
618	delete_auth(struct Client *target_p)
619	{
620	dlink_node *ptr;
621	dlink_node *next_ptr;
622	struct AuthRequest *auth;
623
624	if (!IsUnknown(target_p))
625	return;
626
627	if (target_p->localClient->dns_query != NULL)
628	DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_dns_list.head)
629	{
630	auth = ptr->data;
631
632	if (auth->client == target_p)
633	{
634	delete_resolver_queries(target_p->localClient->dns_query);
635
636	dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
637	if (!IsDoingAuth(auth))
638	{
639	MyFree(auth);
640	return;
641	}
642	}
643	}
644
645	DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
646	{
647	auth = ptr->data;
648
649	if (auth->client == target_p)
650	{
651	fd_close(&auth->fd);
652
653	dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
654	MyFree(auth);
655	}
656	}
657	}