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 "s_stats.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 */

  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:	69
Committed:	Tue Oct 4 16:09:51 2005 UTC (20 years, 10 months ago) by adx
Content type:	text/x-csrc
File size:	16895 byte(s)
Log Message:	- splitted ircd/libio, all headers connected with libio sources have been moved for internal use only. To use libio interface, include "libio.h" (which is already done in "stdinc.h")
#	User	Rev	Content
1	adx	30	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* s_auth.c: Functions for querying a users ident.
4			*
5			* Copyright (C) 2002 by the past and present ircd coders, and others.
6			*
7			* This program is free software; you can redistribute it and/or modify
8			* it under the terms of the GNU General Public License as published by
9			* the Free Software Foundation; either version 2 of the License, or
10			* (at your option) any later version.
11			*
12			* This program is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			* GNU General Public License for more details.
16			*
17			* You should have received a copy of the GNU General Public License
18			* along with this program; if not, write to the Free Software
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20			* USA
21			*
22	knight	31	* $Id$
23	adx	30	*/
24
25			/*
26			* Changes:
27			* July 6, 1999 - Rewrote most of the code here. When a client connects
28			* to the server and passes initial socket validation checks, it
29			* is owned by this module (auth) which returns it to the rest of the
30			* server when dns and auth queries are finished. Until the client is
31			* released, the server does not know it exists and does not process
32			* any messages from it.
33			* --Bleep Thomas Helvey <tomh@inxpress.net>
34			*/
35			#include "stdinc.h"
36			#include "s_auth.h"
37			#include "s_conf.h"
38			#include "client.h"
39			#include "common.h"
40			#include "ircd.h"
41			#include "numeric.h"
42			#include "packet.h"
43			#include "s_stats.h"
44			#include "send.h"
45
46			static const char *HeaderMessages[] = {
47			":%s NOTICE AUTH :*** Looking up your hostname...",
48			":%s NOTICE AUTH :*** Found your hostname",
49			":%s NOTICE AUTH :*** Couldn't look up your hostname",
50			":%s NOTICE AUTH :*** Checking Ident",
51			":%s NOTICE AUTH :*** Got Ident response",
52			":%s NOTICE AUTH :*** No Ident response",
53			":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.",
54			":%s NOTICE AUTH :*** Your hostname is too long, ignoring hostname"
55			};
56
57			enum {
58			REPORT_DO_DNS,
59			REPORT_FIN_DNS,
60			REPORT_FAIL_DNS,
61			REPORT_DO_ID,
62			REPORT_FIN_ID,
63			REPORT_FAIL_ID,
64			REPORT_IP_MISMATCH,
65			REPORT_HOST_TOOLONG
66			};
67
68			#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name)
69
70			/*
71			* Ok, the original was confusing.
72			* Now there are two lists, an auth request can be on both at the same time
73			* or only on one or the other.
74			* - Dianora
75			*/
76			static dlink_list auth_doing_dns_list = { NULL, NULL, 0 };
77			static dlink_list auth_doing_ident_list = { NULL, NULL, 0 };
78
79			static EVH timeout_auth_queries_event;
80
81			static PF read_auth_reply;
82			static CNCB auth_connect_callback;
83			static CBFUNC start_auth;
84
85			struct Callback *auth_cb = NULL;
86
87			/* init_auth()
88			*
89			* Initialise the auth code
90			*/
91			void
92			init_auth(void)
93			{
94			auth_cb = register_callback("start_auth", start_auth);
95			eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
96			}
97
98			/*
99			* make_auth_request - allocate a new auth request
100			*/
101			static struct AuthRequest *
102			make_auth_request(struct Client *client)
103			{
104			struct AuthRequest *request = MyMalloc(sizeof(struct AuthRequest));
105
106			request->client = client;
107			request->timeout = CurrentTime + CONNECTTIMEOUT;
108
109			return (request);
110			}
111
112			/*
113			* release_auth_client - release auth client from auth system
114			* this adds the client into the local client lists so it can be read by
115			* the main io processing loop
116			*/
117			void
118			release_auth_client(struct Client *client)
119			{
120			/*
121			* When a client has auth'ed, we want to start reading what it sends
122			* us. This is what read_packet() does.
123			* -- adrian
124			*/
125			client->localClient->allow_read = MAX_FLOOD;
126			comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
127			if ((client->node.prev != NULL) \|\| (client->node.next != NULL))
128			{
129			sendto_realops_flags(UMODE_ALL, L_OPER,
130			"already linked %s at %s:%d", client->name,
131			__FILE__, __LINE__);
132			ilog(L_ERROR, "already linked %s at %s:%d", client->name,
133			__FILE__, __LINE__);
134			assert(0==5);
135			}
136			else
137			dlinkAdd(client, &client->node, &global_client_list);
138			read_packet(&client->localClient->fd, client);
139			}
140
141			/*
142			* auth_dns_callback - called when resolver query finishes
143			* if the query resulted in a successful search, hp will contain
144			* a non-null pointer, otherwise hp will be null.
145			* set the client on it's way to a connection completion, regardless
146			* of success of failure
147			*/
148			static void
149			auth_dns_callback(void vptr, struct DNSReply reply)
150			{
151			struct AuthRequest auth = (struct AuthRequest )vptr;
152
153			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
154			ClearDNSPending(auth);
155
156			if (reply != NULL)
157			{
158			struct sockaddr_in v4, v4dns;
159			#ifdef IPV6
160			struct sockaddr_in6 v6, v6dns;
161			#endif
162			int good = 1;
163
164			#ifdef IPV6
165			if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
166			{
167			v6 = (struct sockaddr_in6 *)&auth->client->localClient->ip;
168			v6dns = (struct sockaddr_in6 *)&reply->addr;
169			if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
170			{
171			sendheader(auth->client, REPORT_IP_MISMATCH);
172			good = 0;
173			}
174			}
175			else
176			#endif
177			{
178			v4 = (struct sockaddr_in *)&auth->client->localClient->ip;
179			v4dns = (struct sockaddr_in *)&reply->addr;
180			if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
181			{
182			sendheader(auth->client, REPORT_IP_MISMATCH);
183			good = 0;
184			}
185			}
186			if (good && strlen(reply->h_name) <= HOSTLEN)
187			{
188			strlcpy(auth->client->host, reply->h_name,
189			sizeof(auth->client->host));
190			sendheader(auth->client, REPORT_FIN_DNS);
191			}
192			else if (strlen(reply->h_name) > HOSTLEN)
193			sendheader(auth->client, REPORT_HOST_TOOLONG);
194			}
195			else
196			sendheader(auth->client, REPORT_FAIL_DNS);
197
198			MyFree(auth->client->localClient->dns_query);
199			auth->client->localClient->dns_query = NULL;
200
201			if (!IsDoingAuth(auth))
202			{
203			struct Client *client_p = auth->client;
204			MyFree(auth);
205			release_auth_client(client_p);
206			}
207			}
208
209			/*
210			* authsenderr - handle auth send errors
211			*/
212			static void
213			auth_error(struct AuthRequest *auth)
214			{
215			++ServerStats->is_abad;
216
217			fd_close(&auth->fd);
218
219			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
220			ClearAuth(auth);
221
222			sendheader(auth->client, REPORT_FAIL_ID);
223
224			if (!IsDNSPending(auth) && !IsCrit(auth))
225			{
226			release_auth_client(auth->client);
227			MyFree(auth);
228			}
229			}
230
231			/*
232			* start_auth_query - Flag the client to show that an attempt to
233			* contact the ident server on
234			* the client's host. The connect and subsequently the socket are all put
235			* into 'non-blocking' mode. Should the connect or any later phase of the
236			* identifing process fail, it is aborted and the user is given a username
237			* of "unknown".
238			*/
239			static int
240			start_auth_query(struct AuthRequest *auth)
241			{
242			struct irc_ssaddr localaddr;
243			socklen_t locallen = sizeof(struct irc_ssaddr);
244			#ifdef IPV6
245			struct sockaddr_in6 *v6;
246			#else
247			struct sockaddr_in *v4;
248			#endif
249
250			/* open a socket of the same type as the client socket */
251			if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
252			SOCK_STREAM, 0, "ident") == -1)
253			{
254			report_error(L_ALL, "creating auth stream socket %s:%s",
255			get_client_name(auth->client, SHOW_IP), errno);
256			ilog(L_ERROR, "Unable to create auth socket for %s",
257			get_client_name(auth->client, SHOW_IP));
258			++ServerStats->is_abad;
259			return 0;
260			}
261
262			sendheader(auth->client, REPORT_DO_ID);
263
264			/*
265			* get the local address of the client and bind to that to
266			* make the auth request. This used to be done only for
267			* ifdef VIRTUAL_HOST, but needs to be done for all clients
268			* since the ident request must originate from that same address--
269			* and machines with multiple IP addresses are common now
270			*/
271			memset(&localaddr, 0, locallen);
272			getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
273			&locallen);
274
275			#ifdef IPV6
276			remove_ipv6_mapping(&localaddr);
277			v6 = (struct sockaddr_in6 *)&localaddr;
278			v6->sin6_port = htons(0);
279			#else
280			localaddr.ss_len = locallen;
281			v4 = (struct sockaddr_in *)&localaddr;
282			v4->sin_port = htons(0);
283			#endif
284			localaddr.ss_port = htons(0);
285
286			SetDoingAuth(auth);
287			dlinkAdd(auth, &auth->ident_node, &auth_doing_ident_list);
288
289			comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
290			(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
291			auth, auth->client->localClient->ip.ss.ss_family,
292			GlobalSetOptions.ident_timeout);
293			return 1; /* We suceed here for now */
294			}
295
296			/*
297			* GetValidIdent - parse ident query reply from identd server
298			*
299			* Inputs - pointer to ident buf
300			* Output - NULL if no valid ident found, otherwise pointer to name
301			* Side effects -
302			*/
303			/*
304			* A few questions have been asked about this mess, obviously
305			* it should have been commented better the first time.
306			* The original idea was to remove all references to libc from ircd-hybrid.
307			* Instead of having to write a replacement for sscanf(), I did a
308			* rather gruseome parser here so we could remove this function call.
309			* Note, that I had also removed a few floating point printfs as well (though
310			* now we are still stuck with a few...)
311			* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
312			* it would have been nice to remove some unneeded code.
313			* Oh well. If we don't remove libc stuff totally, then it would be
314			* far cleaner to use sscanf()
315			*
316			* - Dianora
317			*/
318			static char *
319			GetValidIdent(char *buf)
320			{
321			int remp = 0;
322			int locp = 0;
323			char* colon1Ptr;
324			char* colon2Ptr;
325			char* colon3Ptr;
326			char* commaPtr;
327			char* remotePortString;
328
329			/* All this to get rid of a sscanf() fun. */
330			remotePortString = buf;
331
332			if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
333			return 0;
334			*colon1Ptr = '\0';
335			colon1Ptr++;
336
337			if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
338			return 0;
339			*colon2Ptr = '\0';
340			colon2Ptr++;
341
342			if ((commaPtr = strchr(remotePortString, ',')) == NULL)
343			return 0;
344			*commaPtr = '\0';
345			commaPtr++;
346
347			if ((remp = atoi(remotePortString)) == 0)
348			return 0;
349
350			if ((locp = atoi(commaPtr)) == 0)
351			return 0;
352
353			/* look for USERID bordered by first pair of colons */
354			if (strstr(colon1Ptr, "USERID") == NULL)
355			return 0;
356
357			if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
358			return 0;
359			*colon3Ptr = '\0';
360			colon3Ptr++;
361			return (colon3Ptr);
362			}
363
364			/*
365			* start_auth
366			*
367			* inputs - pointer to client to auth
368			* output - NONE
369			* side effects - starts auth (identd) and dns queries for a client
370			*/
371			static void *
372			start_auth(va_list args)
373			{
374			struct Client client = va_arg(args, struct Client );
375			struct AuthRequest *auth = NULL;
376
377			assert(client != NULL);
378
379			auth = make_auth_request(client);
380			SetCrit(auth);
381
382			client->localClient->dns_query = MyMalloc(sizeof(struct DNSQuery));
383			client->localClient->dns_query->ptr = auth;
384			client->localClient->dns_query->callback = auth_dns_callback;
385
386			sendheader(client, REPORT_DO_DNS);
387
388			if (ConfigFileEntry.disable_auth == 0)
389			start_auth_query(auth);
390
391			/* auth order changed, before gethost_byaddr can immediately call
392			* dns callback under win32 when the lookup cannot be started.
393			* And that would do MyFree(auth) etc -adx */
394			SetDNSPending(auth);
395			dlinkAdd(auth, &auth->dns_node, &auth_doing_dns_list);
396			ClearCrit(auth);
397			gethost_byaddr(&client->localClient->ip, client->localClient->dns_query);
398
399			return NULL;
400			}
401
402			/*
403			* timeout_auth_queries - timeout resolver and identd requests
404			* allow clients through if requests failed
405			*/
406			static void
407			timeout_auth_queries_event(void *notused)
408			{
409			dlink_node *ptr;
410			dlink_node *next_ptr;
411			struct AuthRequest* auth;
412
413			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
414			{
415			auth = ptr->data;
416
417			if (auth->timeout <= CurrentTime)
418			{
419			fd_close(&auth->fd);
420
421			++ServerStats->is_abad;
422			sendheader(auth->client, REPORT_FAIL_ID);
423
424			if (IsDNSPending(auth))
425			{
426			struct Client *client_p = auth->client;
427
428			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
429			if (client_p->localClient->dns_query != NULL)
430			{
431			delete_resolver_queries(client_p->localClient->dns_query);
432			MyFree(client_p->localClient->dns_query);
433			}
434			auth->client->localClient->dns_query = NULL;
435			sendheader(client_p, REPORT_FAIL_DNS);
436			}
437
438			ilog(L_INFO, "DNS/AUTH timeout %s",
439			get_client_name(auth->client, SHOW_IP));
440
441			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
442			release_auth_client(auth->client);
443			MyFree(auth);
444			}
445			}
446			}
447
448			/*
449			* auth_connect_callback() - deal with the result of comm_connect_tcp()
450			*
451			* If the connection failed, we simply close the auth fd and report
452			* a failure. If the connection suceeded send the ident server a query
453			* giving "theirport , ourport". The write is only attempted once so
454			* it is deemed to be a fail if the entire write doesn't write all the
455			* data given. This shouldnt be a problem since the socket should have
456			* a write buffer far greater than this message to store it in should
457			* problems arise. -avalon
458			*/
459			static void
460			auth_connect_callback(fde_t fd, int error, void data)
461			{
462			struct AuthRequest *auth = data;
463			struct irc_ssaddr us;
464			struct irc_ssaddr them;
465			char authbuf[32];
466			socklen_t ulen = sizeof(struct irc_ssaddr);
467			socklen_t tlen = sizeof(struct irc_ssaddr);
468			u_int16_t uport, tport;
469			#ifdef IPV6
470			struct sockaddr_in6 *v6;
471			#else
472			struct sockaddr_in *v4;
473			#endif
474
475			if (error != COMM_OK)
476			{
477			auth_error(auth);
478			return;
479			}
480
481			if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *) &us,
482			(socklen_t *) &ulen) \|\|
483			getpeername(auth->client->localClient->fd.fd, (struct sockaddr *) &them,
484			(socklen_t *) &tlen))
485			{
486			ilog(L_INFO, "auth get{sock,peer}name error for %s",
487			get_client_name(auth->client, SHOW_IP));
488			auth_error(auth);
489			return;
490			}
491
492			#ifdef IPV6
493			v6 = (struct sockaddr_in6 *)&us;
494			uport = ntohs(v6->sin6_port);
495			v6 = (struct sockaddr_in6 *)&them;
496			tport = ntohs(v6->sin6_port);
497			remove_ipv6_mapping(&us);
498			remove_ipv6_mapping(&them);
499			#else
500			v4 = (struct sockaddr_in *)&us;
501			uport = ntohs(v4->sin_port);
502			v4 = (struct sockaddr_in *)&them;
503			tport = ntohs(v4->sin_port);
504			us.ss_len = ulen;
505			them.ss_len = tlen;
506			#endif
507
508			ircsprintf(authbuf, "%u , %u\r\n", tport, uport);
509
510			if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
511			{
512			auth_error(auth);
513			return;
514			}
515			read_auth_reply(&auth->fd, auth);
516			}
517
518			/*
519			* read_auth_reply - read the reply (if any) from the ident server
520			* we connected to.
521			* We only give it one shot, if the reply isn't good the first time
522			* fail the authentication entirely. --Bleep
523			*/
524			#define AUTH_BUFSIZ 128
525
526			static void
527			read_auth_reply(fde_t fd, void data)
528			{
529			struct AuthRequest *auth = data;
530			char *s = NULL;
531			char *t = NULL;
532			int len;
533			int count;
534			char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
535
536			len = recv(fd->fd, buf, AUTH_BUFSIZ, 0);
537
538			if (len < 0)
539			{
540			#ifdef _WIN32
541			errno = WSAGetLastError();
542			#endif
543			if (ignoreErrno(errno))
544			comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
545			else
546			auth_error(auth);
547			return;
548			}
549
550			if (len > 0)
551			{
552			buf[len] = '\0';
553
554			if ((s = GetValidIdent(buf)))
555			{
556			t = auth->client->username;
557
558			while (s == '~' \|\| s == '^')
559			s++;
560
561			for (count = USERLEN; *s && count; s++)
562			{
563			if (*s == '@')
564			break;
565			if (!IsSpace(s) && s != ':' && *s != '[')
566			{
567			t++ = s;
568			count--;
569			}
570			}
571
572			*t = '\0';
573			}
574			}
575
576			fd_close(fd);
577
578			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
579			ClearAuth(auth);
580
581			if (s == NULL)
582			{
583			sendheader(auth->client, REPORT_FAIL_ID);
584			++ServerStats->is_abad;
585			}
586			else
587			{
588			sendheader(auth->client, REPORT_FIN_ID);
589			++ServerStats->is_asuc;
590			SetGotId(auth->client);
591			}
592
593			if (!IsDNSPending(auth) && !IsCrit(auth))
594			{
595			release_auth_client(auth->client);
596			MyFree(auth);
597			}
598			}
599
600			/*
601			* delete_auth()
602			*/
603			void
604			delete_auth(struct Client *target_p)
605			{
606			dlink_node *ptr;
607			dlink_node *next_ptr;
608			struct AuthRequest *auth;
609
610			if (!IsUnknown(target_p))
611			return;
612
613			if (target_p->localClient->dns_query != NULL)
614			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_dns_list.head)
615			{
616			auth = ptr->data;
617
618			if (auth->client == target_p)
619			{
620			delete_resolver_queries(target_p->localClient->dns_query);
621
622			dlinkDelete(&auth->dns_node, &auth_doing_dns_list);
623			if (!IsDoingAuth(auth))
624			{
625			MyFree(auth);
626			return;
627			}
628			}
629			}
630
631			DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_ident_list.head)
632			{
633			auth = ptr->data;
634
635			if (auth->client == target_p)
636			{
637			fd_close(&auth->fd);
638
639			dlinkDelete(&auth->ident_node, &auth_doing_ident_list);
640			MyFree(auth);
641			}
642			}
643			}