ircd-hybrid-7.2/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 "tools.h"
#include "list.h"
#include "s_auth.h"
#include "s_conf.h"
#include "client.h"
#include "common.h"
#include "event.h"
#include "fdlist.h"              /* fdlist_add */
#include "hook.h"
#include "irc_string.h"
#include "sprintf_irc.h"
#include "ircd.h"
#include "numeric.h"
#include "packet.h"
#include "irc_res.h"
#include "s_bsd.h"
#include "s_log.h"
#include "s_stats.h"
#include "send.h"
#include "memory.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 */

  len = recv(fd->fd, buf, AUTH_BUFSIZ, 0);
  
  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:	33
Committed:	Sun Oct 2 20:50:00 2005 UTC (18 years, 6 months ago) by knight
Content type:	text/x-csrc
Original Path:	*ircd-hybrid/src/s_auth.c*
File size:	17147 byte(s)
Log Message:	- svn:keywords
#	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 "tools.h"
37			#include "list.h"
38			#include "s_auth.h"
39			#include "s_conf.h"
40			#include "client.h"
41			#include "common.h"
42			#include "event.h"
43			#include "fdlist.h" /* fdlist_add */
44			#include "hook.h"
45			#include "irc_string.h"
46			#include "sprintf_irc.h"
47			#include "ircd.h"
48			#include "numeric.h"
49			#include "packet.h"
50			#include "irc_res.h"
51			#include "s_bsd.h"
52			#include "s_log.h"
53			#include "s_stats.h"
54			#include "send.h"
55			#include "memory.h"
56
57			static const char *HeaderMessages[] = {
58			":%s NOTICE AUTH :*** Looking up your hostname...",
59			":%s NOTICE AUTH :*** Found your hostname",
60			":%s NOTICE AUTH :*** Couldn't look up your hostname",
61			":%s NOTICE AUTH :*** Checking Ident",
62			":%s NOTICE AUTH :*** Got Ident response",
63			":%s NOTICE AUTH :*** No Ident response",
64			":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.",
65			":%s NOTICE AUTH :*** Your hostname is too long, ignoring hostname"
66			};
67
68			enum {
69			REPORT_DO_DNS,
70			REPORT_FIN_DNS,
71			REPORT_FAIL_DNS,
72			REPORT_DO_ID,
73			REPORT_FIN_ID,
74			REPORT_FAIL_ID,
75			REPORT_IP_MISMATCH,
76			REPORT_HOST_TOOLONG
77			};
78
79			#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name)
80
81			/*
82			* Ok, the original was confusing.
83			* Now there are two lists, an auth request can be on both at the same time
84			* or only on one or the other.
85			* - Dianora
86			*/
87			static dlink_list auth_doing_dns_list = { NULL, NULL, 0 };
88			static dlink_list auth_doing_ident_list = { NULL, NULL, 0 };
89
90			static EVH timeout_auth_queries_event;
91
92			static PF read_auth_reply;
93			static CNCB auth_connect_callback;
94			static CBFUNC start_auth;
95
96			struct Callback *auth_cb = NULL;
97
98			/* init_auth()
99			*
100			* Initialise the auth code
101			*/
102			void
103			init_auth(void)
104			{
105			auth_cb = register_callback("start_auth", start_auth);
106			eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
107			}
108
109			/*
110			* make_auth_request - allocate a new auth request
111			*/
112			static struct AuthRequest *
113			make_auth_request(struct Client *client)
114			{
115			struct AuthRequest *request = MyMalloc(sizeof(struct AuthRequest));
116
117			request->client = client;
118			request->timeout = CurrentTime + CONNECTTIMEOUT;
119
120			return (request);
121			}
122
123			/*
124			* release_auth_client - release auth client from auth system
125			* this adds the client into the local client lists so it can be read by
126			* the main io processing loop
127			*/
128			void
129			release_auth_client(struct Client *client)
130			{
131			/*
132			* When a client has auth'ed, we want to start reading what it sends
133			* us. This is what read_packet() does.
134			* -- adrian
135			*/
136			client->localClient->allow_read = MAX_FLOOD;
137			comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
138			if ((client->node.prev != NULL) \|\| (client->node.next != NULL))
139			{
140			sendto_realops_flags(UMODE_ALL, L_OPER,
141			"already linked %s at %s:%d", client->name,
142			__FILE__, __LINE__);
143			ilog(L_ERROR, "already linked %s at %s:%d", client->name,
144			__FILE__, __LINE__);
145			assert(0==5);
146			}
147			else
148			dlinkAdd(client, &client->node, &global_client_list);
149			read_packet(&client->localClient->fd, client);
150			}
151
152			/*
153			* auth_dns_callback - called when resolver query finishes
154			* if the query resulted in a successful search, hp will contain
155			* a non-null pointer, otherwise hp will be null.
156			* set the client on it's way to a connection completion, regardless
157			* of success of failure
158			*/
159			static void
160			auth_dns_callback(void vptr, struct DNSReply reply)
161			{
162			struct AuthRequest auth = (struct AuthRequest )vptr;
163
164			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
165			ClearDNSPending(auth);
166
167			if (reply != NULL)
168			{
169			struct sockaddr_in v4, v4dns;
170			#ifdef IPV6
171			struct sockaddr_in6 v6, v6dns;
172			#endif
173			int good = 1;
174
175			#ifdef IPV6
176			if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
177			{
178			v6 = (struct sockaddr_in6 *)&auth->client->localClient->ip;
179			v6dns = (struct sockaddr_in6 *)&reply->addr;
180			if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
181			{
182			sendheader(auth->client, REPORT_IP_MISMATCH);
183			good = 0;
184			}
185			}
186			else
187			#endif
188			{
189			v4 = (struct sockaddr_in *)&auth->client->localClient->ip;
190			v4dns = (struct sockaddr_in *)&reply->addr;
191			if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
192			{
193			sendheader(auth->client, REPORT_IP_MISMATCH);
194			good = 0;
195			}
196			}
197			if (good && strlen(reply->h_name) <= HOSTLEN)
198			{
199			strlcpy(auth->client->host, reply->h_name,
200			sizeof(auth->client->host));
201			sendheader(auth->client, REPORT_FIN_DNS);
202			}
203			else if (strlen(reply->h_name) > HOSTLEN)
204			sendheader(auth->client, REPORT_HOST_TOOLONG);
205			}
206			else
207			sendheader(auth->client, REPORT_FAIL_DNS);
208
209			MyFree(auth->client->localClient->dns_query);
210			auth->client->localClient->dns_query = NULL;
211
212			if (!IsDoingAuth(auth))
213			{
214			struct Client *client_p = auth->client;
215			MyFree(auth);
216			release_auth_client(client_p);
217			}
218			}
219
220			/*
221			* authsenderr - handle auth send errors
222			*/
223			static void
224			auth_error(struct AuthRequest *auth)
225			{
226			++ServerStats->is_abad;
227
228			fd_close(&auth->fd);
229
230			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
231			ClearAuth(auth);
232
233			sendheader(auth->client, REPORT_FAIL_ID);
234
235			if (!IsDNSPending(auth) && !IsCrit(auth))
236			{
237			release_auth_client(auth->client);
238			MyFree(auth);
239			}
240			}
241
242			/*
243			* start_auth_query - Flag the client to show that an attempt to
244			* contact the ident server on
245			* the client's host. The connect and subsequently the socket are all put
246			* into 'non-blocking' mode. Should the connect or any later phase of the
247			* identifing process fail, it is aborted and the user is given a username
248			* of "unknown".
249			*/
250			static int
251			start_auth_query(struct AuthRequest *auth)
252			{
253			struct irc_ssaddr localaddr;
254			socklen_t locallen = sizeof(struct irc_ssaddr);
255			#ifdef IPV6
256			struct sockaddr_in6 *v6;
257			#else
258			struct sockaddr_in *v4;
259			#endif
260
261			/* open a socket of the same type as the client socket */
262			if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
263			SOCK_STREAM, 0, "ident") == -1)
264			{
265			report_error(L_ALL, "creating auth stream socket %s:%s",
266			get_client_name(auth->client, SHOW_IP), errno);
267			ilog(L_ERROR, "Unable to create auth socket for %s",
268			get_client_name(auth->client, SHOW_IP));
269			++ServerStats->is_abad;
270			return 0;
271			}
272
273			sendheader(auth->client, REPORT_DO_ID);
274
275			/*
276			* get the local address of the client and bind to that to
277			* make the auth request. This used to be done only for
278			* ifdef VIRTUAL_HOST, but needs to be done for all clients
279			* since the ident request must originate from that same address--
280			* and machines with multiple IP addresses are common now
281			*/
282			memset(&localaddr, 0, locallen);
283			getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
284			&locallen);
285
286			#ifdef IPV6
287			remove_ipv6_mapping(&localaddr);
288			v6 = (struct sockaddr_in6 *)&localaddr;
289			v6->sin6_port = htons(0);
290			#else
291			localaddr.ss_len = locallen;
292			v4 = (struct sockaddr_in *)&localaddr;
293			v4->sin_port = htons(0);
294			#endif
295			localaddr.ss_port = htons(0);
296
297			SetDoingAuth(auth);
298			dlinkAdd(auth, &auth->ident_node, &auth_doing_ident_list);
299
300			comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
301			(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
302			auth, auth->client->localClient->ip.ss.ss_family,
303			GlobalSetOptions.ident_timeout);
304			return 1; /* We suceed here for now */
305			}
306
307			/*
308			* GetValidIdent - parse ident query reply from identd server
309			*
310			* Inputs - pointer to ident buf
311			* Output - NULL if no valid ident found, otherwise pointer to name
312			* Side effects -
313			*/
314			/*
315			* A few questions have been asked about this mess, obviously
316			* it should have been commented better the first time.
317			* The original idea was to remove all references to libc from ircd-hybrid.
318			* Instead of having to write a replacement for sscanf(), I did a
319			* rather gruseome parser here so we could remove this function call.
320			* Note, that I had also removed a few floating point printfs as well (though
321			* now we are still stuck with a few...)
322			* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
323			* it would have been nice to remove some unneeded code.
324			* Oh well. If we don't remove libc stuff totally, then it would be
325			* far cleaner to use sscanf()
326			*
327			* - Dianora
328			*/
329			static char *
330			GetValidIdent(char *buf)
331			{
332			int remp = 0;
333			int locp = 0;
334			char* colon1Ptr;
335			char* colon2Ptr;
336			char* colon3Ptr;
337			char* commaPtr;
338			char* remotePortString;
339
340			/* All this to get rid of a sscanf() fun. */
341			remotePortString = buf;
342
343			if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
344			return 0;
345			*colon1Ptr = '\0';
346			colon1Ptr++;
347
348			if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
349			return 0;
350			*colon2Ptr = '\0';
351			colon2Ptr++;
352
353			if ((commaPtr = strchr(remotePortString, ',')) == NULL)
354			return 0;
355			*commaPtr = '\0';
356			commaPtr++;
357
358			if ((remp = atoi(remotePortString)) == 0)
359			return 0;
360
361			if ((locp = atoi(commaPtr)) == 0)
362			return 0;
363
364			/* look for USERID bordered by first pair of colons */
365			if (strstr(colon1Ptr, "USERID") == NULL)
366			return 0;
367
368			if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
369			return 0;
370			*colon3Ptr = '\0';
371			colon3Ptr++;
372			return (colon3Ptr);
373			}
374
375			/*
376			* start_auth
377			*
378			* inputs - pointer to client to auth
379			* output - NONE
380			* side effects - starts auth (identd) and dns queries for a client
381			*/
382			static void *
383			start_auth(va_list args)
384			{
385			struct Client client = va_arg(args, struct Client );
386			struct AuthRequest *auth = NULL;
387
388			assert(client != NULL);
389
390			auth = make_auth_request(client);
391			SetCrit(auth);
392
393			client->localClient->dns_query = MyMalloc(sizeof(struct DNSQuery));
394			client->localClient->dns_query->ptr = auth;
395			client->localClient->dns_query->callback = auth_dns_callback;
396
397			sendheader(client, REPORT_DO_DNS);
398
399			if (ConfigFileEntry.disable_auth == 0)
400			start_auth_query(auth);
401
402			/* auth order changed, before gethost_byaddr can immediately call
403			* dns callback under win32 when the lookup cannot be started.
404			* And that would do MyFree(auth) etc -adx */
405			SetDNSPending(auth);
406			dlinkAdd(auth, &auth->dns_node, &auth_doing_dns_list);
407			ClearCrit(auth);
408			gethost_byaddr(&client->localClient->ip, client->localClient->dns_query);
409
410			return NULL;
411			}
412
413			/*
414			* timeout_auth_queries - timeout resolver and identd requests
415			* allow clients through if requests failed
416			*/
417			static void
418			timeout_auth_queries_event(void *notused)
419			{
420			dlink_node *ptr;
421			dlink_node *next_ptr;
422			struct AuthRequest* auth;
423
424			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
425			{
426			auth = ptr->data;
427
428			if (auth->timeout <= CurrentTime)
429			{
430			fd_close(&auth->fd);
431
432			++ServerStats->is_abad;
433			sendheader(auth->client, REPORT_FAIL_ID);
434
435			if (IsDNSPending(auth))
436			{
437			struct Client *client_p = auth->client;
438
439			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
440			if (client_p->localClient->dns_query != NULL)
441			{
442			delete_resolver_queries(client_p->localClient->dns_query);
443			MyFree(client_p->localClient->dns_query);
444			}
445			auth->client->localClient->dns_query = NULL;
446			sendheader(client_p, REPORT_FAIL_DNS);
447			}
448
449			ilog(L_INFO, "DNS/AUTH timeout %s",
450			get_client_name(auth->client, SHOW_IP));
451
452			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
453			release_auth_client(auth->client);
454			MyFree(auth);
455			}
456			}
457			}
458
459			/*
460			* auth_connect_callback() - deal with the result of comm_connect_tcp()
461			*
462			* If the connection failed, we simply close the auth fd and report
463			* a failure. If the connection suceeded send the ident server a query
464			* giving "theirport , ourport". The write is only attempted once so
465			* it is deemed to be a fail if the entire write doesn't write all the
466			* data given. This shouldnt be a problem since the socket should have
467			* a write buffer far greater than this message to store it in should
468			* problems arise. -avalon
469			*/
470			static void
471			auth_connect_callback(fde_t fd, int error, void data)
472			{
473			struct AuthRequest *auth = data;
474			struct irc_ssaddr us;
475			struct irc_ssaddr them;
476			char authbuf[32];
477			socklen_t ulen = sizeof(struct irc_ssaddr);
478			socklen_t tlen = sizeof(struct irc_ssaddr);
479			u_int16_t uport, tport;
480			#ifdef IPV6
481			struct sockaddr_in6 *v6;
482			#else
483			struct sockaddr_in *v4;
484			#endif
485
486			if (error != COMM_OK)
487			{
488			auth_error(auth);
489			return;
490			}
491
492			if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *) &us,
493			(socklen_t *) &ulen) \|\|
494			getpeername(auth->client->localClient->fd.fd, (struct sockaddr *) &them,
495			(socklen_t *) &tlen))
496			{
497			ilog(L_INFO, "auth get{sock,peer}name error for %s",
498			get_client_name(auth->client, SHOW_IP));
499			auth_error(auth);
500			return;
501			}
502
503			#ifdef IPV6
504			v6 = (struct sockaddr_in6 *)&us;
505			uport = ntohs(v6->sin6_port);
506			v6 = (struct sockaddr_in6 *)&them;
507			tport = ntohs(v6->sin6_port);
508			remove_ipv6_mapping(&us);
509			remove_ipv6_mapping(&them);
510			#else
511			v4 = (struct sockaddr_in *)&us;
512			uport = ntohs(v4->sin_port);
513			v4 = (struct sockaddr_in *)&them;
514			tport = ntohs(v4->sin_port);
515			us.ss_len = ulen;
516			them.ss_len = tlen;
517			#endif
518
519			ircsprintf(authbuf, "%u , %u\r\n", tport, uport);
520
521			if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
522			{
523			auth_error(auth);
524			return;
525			}
526			read_auth_reply(&auth->fd, auth);
527			}
528
529			/*
530			* read_auth_reply - read the reply (if any) from the ident server
531			* we connected to.
532			* We only give it one shot, if the reply isn't good the first time
533			* fail the authentication entirely. --Bleep
534			*/
535			#define AUTH_BUFSIZ 128
536
537			static void
538			read_auth_reply(fde_t fd, void data)
539			{
540			struct AuthRequest *auth = data;
541			char *s = NULL;
542			char *t = NULL;
543			int len;
544			int count;
545			char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
546
547			len = recv(fd->fd, buf, AUTH_BUFSIZ, 0);
548
549			if (len < 0)
550			{
551			#ifdef _WIN32
552			errno = WSAGetLastError();
553			#endif
554			if (ignoreErrno(errno))
555			comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
556			else
557			auth_error(auth);
558			return;
559			}
560
561			if (len > 0)
562			{
563			buf[len] = '\0';
564
565			if ((s = GetValidIdent(buf)))
566			{
567			t = auth->client->username;
568
569			while (s == '~' \|\| s == '^')
570			s++;
571
572			for (count = USERLEN; *s && count; s++)
573			{
574			if (*s == '@')
575			break;
576			if (!IsSpace(s) && s != ':' && *s != '[')
577			{
578			t++ = s;
579			count--;
580			}
581			}
582
583			*t = '\0';
584			}
585			}
586
587			fd_close(fd);
588
589			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
590			ClearAuth(auth);
591
592			if (s == NULL)
593			{
594			sendheader(auth->client, REPORT_FAIL_ID);
595			++ServerStats->is_abad;
596			}
597			else
598			{
599			sendheader(auth->client, REPORT_FIN_ID);
600			++ServerStats->is_asuc;
601			SetGotId(auth->client);
602			}
603
604			if (!IsDNSPending(auth) && !IsCrit(auth))
605			{
606			release_auth_client(auth->client);
607			MyFree(auth);
608			}
609			}
610
611			/*
612			* delete_auth()
613			*/
614			void
615			delete_auth(struct Client *target_p)
616			{
617			dlink_node *ptr;
618			dlink_node *next_ptr;
619			struct AuthRequest *auth;
620
621			if (!IsUnknown(target_p))
622			return;
623
624			if (target_p->localClient->dns_query != NULL)
625			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_dns_list.head)
626			{
627			auth = ptr->data;
628
629			if (auth->client == target_p)
630			{
631			delete_resolver_queries(target_p->localClient->dns_query);
632
633			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
634			if (!IsDoingAuth(auth))
635			{
636			MyFree(auth);
637			return;
638			}
639			}
640			}
641
642			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
643			{
644			auth = ptr->data;
645
646			if (auth->client == target_p)
647			{
648			fd_close(&auth->fd);
649
650			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
651			MyFree(auth);
652			}
653			}
654			}