trunk/src/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 "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);

  client->since  = client->lasttime = client->firsttime = CurrentTime;
  client->flags |= FLAGS_FINISHED_AUTH;

  read_packet(&client->localClient->fd, client);
}
 
/*
 * auth_dns_callback - called when resolver query finishes
 * if the query resulted in a successful search, 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);
        MyFree(target_p->localClient->dns_query);
        target_p->localClient->dns_query = NULL;

        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:	896
Committed:	Sat Nov 3 08:54:09 2007 UTC (17 years, 9 months ago) by michael
Content type:	text/x-csrc
Original Path:	*ircd-hybrid-7.2/src/s_auth.c*
File size:	17819 byte(s)
Log Message:	- Killed s_stats.c
#	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 "send.h"
54			#include "memory.h"
55
56			static const char *HeaderMessages[] = {
57			":%s NOTICE AUTH :*** Looking up your hostname...",
58			":%s NOTICE AUTH :*** Found your hostname",
59			":%s NOTICE AUTH :*** Couldn't look up your hostname",
60			":%s NOTICE AUTH :*** Checking Ident",
61			":%s NOTICE AUTH :*** Got Ident response",
62			":%s NOTICE AUTH :*** No Ident response",
63			":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.",
64			":%s NOTICE AUTH :*** Your hostname is too long, ignoring hostname"
65			};
66
67			enum {
68			REPORT_DO_DNS,
69			REPORT_FIN_DNS,
70			REPORT_FAIL_DNS,
71			REPORT_DO_ID,
72			REPORT_FIN_ID,
73			REPORT_FAIL_ID,
74			REPORT_IP_MISMATCH,
75			REPORT_HOST_TOOLONG
76			};
77
78			#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name)
79
80			/*
81			* Ok, the original was confusing.
82			* Now there are two lists, an auth request can be on both at the same time
83			* or only on one or the other.
84			* - Dianora
85			*/
86			static dlink_list auth_doing_dns_list = { NULL, NULL, 0 };
87			static dlink_list auth_doing_ident_list = { NULL, NULL, 0 };
88
89			static EVH timeout_auth_queries_event;
90
91			static PF read_auth_reply;
92			static CNCB auth_connect_callback;
93			static CBFUNC start_auth;
94
95			struct Callback *auth_cb = NULL;
96
97			/* init_auth()
98			*
99			* Initialise the auth code
100			*/
101			void
102			init_auth(void)
103			{
104			auth_cb = register_callback("start_auth", start_auth);
105			eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
106			}
107
108			/*
109			* make_auth_request - allocate a new auth request
110			*/
111			static struct AuthRequest *
112			make_auth_request(struct Client *client)
113			{
114			struct AuthRequest *request = MyMalloc(sizeof(struct AuthRequest));
115
116			request->client = client;
117			request->timeout = CurrentTime + CONNECTTIMEOUT;
118
119	michael	650	return request;
120	adx	30	}
121
122			/*
123			* release_auth_client - release auth client from auth system
124			* this adds the client into the local client lists so it can be read by
125			* the main io processing loop
126			*/
127			void
128			release_auth_client(struct Client *client)
129			{
130			/*
131			* When a client has auth'ed, we want to start reading what it sends
132			* us. This is what read_packet() does.
133			* -- adrian
134			*/
135			client->localClient->allow_read = MAX_FLOOD;
136			comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
137	michael	650
138	adx	30	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	michael	650
150	michael	664	client->since = client->lasttime = client->firsttime = CurrentTime;
151			client->flags \|= FLAGS_FINISHED_AUTH;
152	michael	650
153	adx	30	read_packet(&client->localClient->fd, client);
154			}
155
156			/*
157			* auth_dns_callback - called when resolver query finishes
158			* if the query resulted in a successful search, hp will contain
159			* a non-null pointer, otherwise hp will be null.
160			* set the client on it's way to a connection completion, regardless
161			* of success of failure
162			*/
163			static void
164			auth_dns_callback(void vptr, struct DNSReply reply)
165			{
166			struct AuthRequest auth = (struct AuthRequest )vptr;
167
168			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
169			ClearDNSPending(auth);
170
171			if (reply != NULL)
172			{
173			struct sockaddr_in v4, v4dns;
174			#ifdef IPV6
175			struct sockaddr_in6 v6, v6dns;
176			#endif
177			int good = 1;
178
179			#ifdef IPV6
180			if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
181			{
182			v6 = (struct sockaddr_in6 *)&auth->client->localClient->ip;
183			v6dns = (struct sockaddr_in6 *)&reply->addr;
184			if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
185			{
186			sendheader(auth->client, REPORT_IP_MISMATCH);
187			good = 0;
188			}
189			}
190			else
191			#endif
192			{
193			v4 = (struct sockaddr_in *)&auth->client->localClient->ip;
194			v4dns = (struct sockaddr_in *)&reply->addr;
195			if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
196			{
197			sendheader(auth->client, REPORT_IP_MISMATCH);
198			good = 0;
199			}
200			}
201			if (good && strlen(reply->h_name) <= HOSTLEN)
202			{
203			strlcpy(auth->client->host, reply->h_name,
204			sizeof(auth->client->host));
205			sendheader(auth->client, REPORT_FIN_DNS);
206			}
207			else if (strlen(reply->h_name) > HOSTLEN)
208			sendheader(auth->client, REPORT_HOST_TOOLONG);
209			}
210			else
211			sendheader(auth->client, REPORT_FAIL_DNS);
212
213			MyFree(auth->client->localClient->dns_query);
214			auth->client->localClient->dns_query = NULL;
215
216			if (!IsDoingAuth(auth))
217			{
218			struct Client *client_p = auth->client;
219			MyFree(auth);
220			release_auth_client(client_p);
221			}
222			}
223
224			/*
225			* authsenderr - handle auth send errors
226			*/
227			static void
228			auth_error(struct AuthRequest *auth)
229			{
230	michael	896	++ServerStats.is_abad;
231	adx	30
232			fd_close(&auth->fd);
233
234			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
235			ClearAuth(auth);
236
237			sendheader(auth->client, REPORT_FAIL_ID);
238
239			if (!IsDNSPending(auth) && !IsCrit(auth))
240			{
241			release_auth_client(auth->client);
242			MyFree(auth);
243			}
244			}
245
246			/*
247			* start_auth_query - Flag the client to show that an attempt to
248			* contact the ident server on
249			* the client's host. The connect and subsequently the socket are all put
250			* into 'non-blocking' mode. Should the connect or any later phase of the
251			* identifing process fail, it is aborted and the user is given a username
252			* of "unknown".
253			*/
254			static int
255			start_auth_query(struct AuthRequest *auth)
256			{
257			struct irc_ssaddr localaddr;
258			socklen_t locallen = sizeof(struct irc_ssaddr);
259			#ifdef IPV6
260			struct sockaddr_in6 *v6;
261			#else
262			struct sockaddr_in *v4;
263			#endif
264
265			/* open a socket of the same type as the client socket */
266			if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
267			SOCK_STREAM, 0, "ident") == -1)
268			{
269			report_error(L_ALL, "creating auth stream socket %s:%s",
270			get_client_name(auth->client, SHOW_IP), errno);
271			ilog(L_ERROR, "Unable to create auth socket for %s",
272			get_client_name(auth->client, SHOW_IP));
273	michael	896	++ServerStats.is_abad;
274	adx	30	return 0;
275			}
276
277			sendheader(auth->client, REPORT_DO_ID);
278
279			/*
280			* get the local address of the client and bind to that to
281			* make the auth request. This used to be done only for
282			* ifdef VIRTUAL_HOST, but needs to be done for all clients
283			* since the ident request must originate from that same address--
284			* and machines with multiple IP addresses are common now
285			*/
286			memset(&localaddr, 0, locallen);
287			getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
288			&locallen);
289
290			#ifdef IPV6
291			remove_ipv6_mapping(&localaddr);
292			v6 = (struct sockaddr_in6 *)&localaddr;
293			v6->sin6_port = htons(0);
294			#else
295			localaddr.ss_len = locallen;
296			v4 = (struct sockaddr_in *)&localaddr;
297			v4->sin_port = htons(0);
298			#endif
299			localaddr.ss_port = htons(0);
300
301			SetDoingAuth(auth);
302			dlinkAdd(auth, &auth->ident_node, &auth_doing_ident_list);
303
304			comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
305			(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
306			auth, auth->client->localClient->ip.ss.ss_family,
307			GlobalSetOptions.ident_timeout);
308			return 1; /* We suceed here for now */
309			}
310
311			/*
312			* GetValidIdent - parse ident query reply from identd server
313			*
314			* Inputs - pointer to ident buf
315			* Output - NULL if no valid ident found, otherwise pointer to name
316			* Side effects -
317			*/
318			/*
319			* A few questions have been asked about this mess, obviously
320			* it should have been commented better the first time.
321			* The original idea was to remove all references to libc from ircd-hybrid.
322			* Instead of having to write a replacement for sscanf(), I did a
323			* rather gruseome parser here so we could remove this function call.
324			* Note, that I had also removed a few floating point printfs as well (though
325			* now we are still stuck with a few...)
326			* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
327			* it would have been nice to remove some unneeded code.
328			* Oh well. If we don't remove libc stuff totally, then it would be
329			* far cleaner to use sscanf()
330			*
331			* - Dianora
332			*/
333			static char *
334			GetValidIdent(char *buf)
335			{
336			int remp = 0;
337			int locp = 0;
338			char* colon1Ptr;
339			char* colon2Ptr;
340			char* colon3Ptr;
341			char* commaPtr;
342			char* remotePortString;
343
344			/* All this to get rid of a sscanf() fun. */
345			remotePortString = buf;
346
347			if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
348			return 0;
349			*colon1Ptr = '\0';
350			colon1Ptr++;
351
352			if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
353			return 0;
354			*colon2Ptr = '\0';
355			colon2Ptr++;
356
357			if ((commaPtr = strchr(remotePortString, ',')) == NULL)
358			return 0;
359			*commaPtr = '\0';
360			commaPtr++;
361
362			if ((remp = atoi(remotePortString)) == 0)
363			return 0;
364
365			if ((locp = atoi(commaPtr)) == 0)
366			return 0;
367
368			/* look for USERID bordered by first pair of colons */
369			if (strstr(colon1Ptr, "USERID") == NULL)
370			return 0;
371
372			if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
373			return 0;
374			*colon3Ptr = '\0';
375			colon3Ptr++;
376			return (colon3Ptr);
377			}
378
379			/*
380			* start_auth
381			*
382			* inputs - pointer to client to auth
383			* output - NONE
384			* side effects - starts auth (identd) and dns queries for a client
385			*/
386			static void *
387			start_auth(va_list args)
388			{
389			struct Client client = va_arg(args, struct Client );
390			struct AuthRequest *auth = NULL;
391
392			assert(client != NULL);
393
394			auth = make_auth_request(client);
395			SetCrit(auth);
396
397			client->localClient->dns_query = MyMalloc(sizeof(struct DNSQuery));
398			client->localClient->dns_query->ptr = auth;
399			client->localClient->dns_query->callback = auth_dns_callback;
400
401			sendheader(client, REPORT_DO_DNS);
402
403			if (ConfigFileEntry.disable_auth == 0)
404			start_auth_query(auth);
405
406			/* auth order changed, before gethost_byaddr can immediately call
407			* dns callback under win32 when the lookup cannot be started.
408			* And that would do MyFree(auth) etc -adx */
409			SetDNSPending(auth);
410			dlinkAdd(auth, &auth->dns_node, &auth_doing_dns_list);
411			ClearCrit(auth);
412			gethost_byaddr(&client->localClient->ip, client->localClient->dns_query);
413
414			return NULL;
415			}
416
417			/*
418			* timeout_auth_queries - timeout resolver and identd requests
419			* allow clients through if requests failed
420			*/
421			static void
422			timeout_auth_queries_event(void *notused)
423			{
424			dlink_node *ptr;
425			dlink_node *next_ptr;
426			struct AuthRequest* auth;
427
428			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
429			{
430			auth = ptr->data;
431
432			if (auth->timeout <= CurrentTime)
433			{
434			fd_close(&auth->fd);
435
436	michael	896	++ServerStats.is_abad;
437	adx	30	sendheader(auth->client, REPORT_FAIL_ID);
438
439			if (IsDNSPending(auth))
440			{
441			struct Client *client_p = auth->client;
442
443			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
444			if (client_p->localClient->dns_query != NULL)
445			{
446			delete_resolver_queries(client_p->localClient->dns_query);
447			MyFree(client_p->localClient->dns_query);
448			}
449			auth->client->localClient->dns_query = NULL;
450			sendheader(client_p, REPORT_FAIL_DNS);
451			}
452
453			ilog(L_INFO, "DNS/AUTH timeout %s",
454			get_client_name(auth->client, SHOW_IP));
455
456			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
457			release_auth_client(auth->client);
458			MyFree(auth);
459			}
460			}
461			}
462
463			/*
464			* auth_connect_callback() - deal with the result of comm_connect_tcp()
465			*
466			* If the connection failed, we simply close the auth fd and report
467			* a failure. If the connection suceeded send the ident server a query
468			* giving "theirport , ourport". The write is only attempted once so
469			* it is deemed to be a fail if the entire write doesn't write all the
470			* data given. This shouldnt be a problem since the socket should have
471			* a write buffer far greater than this message to store it in should
472			* problems arise. -avalon
473			*/
474			static void
475			auth_connect_callback(fde_t fd, int error, void data)
476			{
477			struct AuthRequest *auth = data;
478			struct irc_ssaddr us;
479			struct irc_ssaddr them;
480			char authbuf[32];
481			socklen_t ulen = sizeof(struct irc_ssaddr);
482			socklen_t tlen = sizeof(struct irc_ssaddr);
483			u_int16_t uport, tport;
484			#ifdef IPV6
485			struct sockaddr_in6 *v6;
486			#else
487			struct sockaddr_in *v4;
488			#endif
489
490			if (error != COMM_OK)
491			{
492			auth_error(auth);
493			return;
494			}
495
496			if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *) &us,
497			(socklen_t *) &ulen) \|\|
498			getpeername(auth->client->localClient->fd.fd, (struct sockaddr *) &them,
499			(socklen_t *) &tlen))
500			{
501			ilog(L_INFO, "auth get{sock,peer}name error for %s",
502			get_client_name(auth->client, SHOW_IP));
503			auth_error(auth);
504			return;
505			}
506
507			#ifdef IPV6
508			v6 = (struct sockaddr_in6 *)&us;
509			uport = ntohs(v6->sin6_port);
510			v6 = (struct sockaddr_in6 *)&them;
511			tport = ntohs(v6->sin6_port);
512			remove_ipv6_mapping(&us);
513			remove_ipv6_mapping(&them);
514			#else
515			v4 = (struct sockaddr_in *)&us;
516			uport = ntohs(v4->sin_port);
517			v4 = (struct sockaddr_in *)&them;
518			tport = ntohs(v4->sin_port);
519			us.ss_len = ulen;
520			them.ss_len = tlen;
521			#endif
522
523			ircsprintf(authbuf, "%u , %u\r\n", tport, uport);
524
525			if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
526			{
527			auth_error(auth);
528			return;
529			}
530	michael	696
531	adx	30	read_auth_reply(&auth->fd, auth);
532			}
533
534			/*
535			* read_auth_reply - read the reply (if any) from the ident server
536			* we connected to.
537			* We only give it one shot, if the reply isn't good the first time
538			* fail the authentication entirely. --Bleep
539			*/
540			#define AUTH_BUFSIZ 128
541
542			static void
543			read_auth_reply(fde_t fd, void data)
544			{
545			struct AuthRequest *auth = data;
546			char *s = NULL;
547			char *t = NULL;
548			int len;
549			int count;
550			char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
551
552	nenolod	397	/* Why?
553			* Well, recv() on many POSIX systems is a per-packet operation,
554			* and we do not necessarily want this, because on lowspec machines,
555			* the ident response may come back fragmented, thus resulting in an
556			* invalid ident response, even if the ident response was really OK.
557			*
558			* So PLEASE do not change this code to recv without being aware of the
559			* consequences.
560			*
561			* --nenolod
562			*/
563			#ifndef _WIN32
564			len = read(fd->fd, buf, AUTH_BUFSIZ);
565			#else
566	adx	30	len = recv(fd->fd, buf, AUTH_BUFSIZ, 0);
567	nenolod	397	#endif
568	adx	30
569			if (len < 0)
570			{
571			#ifdef _WIN32
572			errno = WSAGetLastError();
573			#endif
574			if (ignoreErrno(errno))
575			comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
576			else
577			auth_error(auth);
578			return;
579			}
580
581			if (len > 0)
582			{
583			buf[len] = '\0';
584
585			if ((s = GetValidIdent(buf)))
586			{
587			t = auth->client->username;
588
589			while (s == '~' \|\| s == '^')
590			s++;
591
592			for (count = USERLEN; *s && count; s++)
593			{
594			if (*s == '@')
595			break;
596			if (!IsSpace(s) && s != ':' && *s != '[')
597			{
598			t++ = s;
599			count--;
600			}
601			}
602
603			*t = '\0';
604			}
605			}
606
607			fd_close(fd);
608
609			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
610			ClearAuth(auth);
611
612			if (s == NULL)
613			{
614			sendheader(auth->client, REPORT_FAIL_ID);
615	michael	896	++ServerStats.is_abad;
616	adx	30	}
617			else
618			{
619			sendheader(auth->client, REPORT_FIN_ID);
620	michael	896	++ServerStats.is_asuc;
621	adx	30	SetGotId(auth->client);
622			}
623
624			if (!IsDNSPending(auth) && !IsCrit(auth))
625			{
626			release_auth_client(auth->client);
627			MyFree(auth);
628			}
629			}
630
631			/*
632			* delete_auth()
633			*/
634			void
635			delete_auth(struct Client *target_p)
636			{
637			dlink_node *ptr;
638			dlink_node *next_ptr;
639			struct AuthRequest *auth;
640
641			if (!IsUnknown(target_p))
642			return;
643
644			if (target_p->localClient->dns_query != NULL)
645			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_dns_list.head)
646			{
647			auth = ptr->data;
648
649			if (auth->client == target_p)
650			{
651			delete_resolver_queries(target_p->localClient->dns_query);
652	michael	696	MyFree(target_p->localClient->dns_query);
653			target_p->localClient->dns_query = NULL;
654	adx	30
655			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
656	michael	696
657	adx	30	if (!IsDoingAuth(auth))
658			{
659			MyFree(auth);
660			return;
661			}
662			}
663			}
664
665			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
666			{
667			auth = ptr->data;
668
669			if (auth->client == target_p)
670			{
671			fd_close(&auth->fd);
672
673			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
674			MyFree(auth);
675			}
676			}
677			}