ircd-hybrid-8/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 "list.h"
#include "ircd_defs.h"
#include "fdlist.h"
#include "s_auth.h"
#include "s_conf.h"
#include "balloc.h"
#include "client.h"
#include "common.h"
#include "event.h"
#include "hook.h"
#include "irc_string.h"
#include "ircd.h"
#include "packet.h"
#include "irc_res.h"
#include "s_bsd.h"
#include "s_log.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)

static BlockHeap *auth_heap = NULL;
static dlink_list auth_doing_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_heap = BlockHeapCreate("auth", sizeof(struct AuthRequest), AUTH_HEAP_SIZE);
  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 = BlockHeapAlloc(auth_heap);

  client->localClient->auth = request;
  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 AuthRequest *auth)
{
  struct Client *client = auth->client;

  if (IsDoingAuth(auth) || IsDNSPending(auth))
    return;

  client->localClient->auth = NULL;
  dlinkDelete(&auth->node, &auth_doing_list);
  BlockHeapFree(auth_heap, auth);

  /*
   * 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);

  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, name will contain
 * a non-NULL pointer, otherwise name 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, const struct irc_ssaddr *addr, const char *name)
{
  struct AuthRequest *auth = vptr;

  ClearDNSPending(auth);

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

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

  release_auth_client(auth);
}

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

  fd_close(&auth->fd);

  ClearAuth(auth);

  sendheader(auth->client, REPORT_FAIL_ID);

  release_auth_client(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);

  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);
  dlinkAdd(auth, &auth->node, &auth_doing_list);

  sendheader(client, REPORT_DO_DNS);

  SetDNSPending(auth);

  if (ConfigFileEntry.disable_auth == 0)
  {
    SetDoingAuth(auth);
    start_auth_query(auth);
  }

  gethost_byaddr(auth_dns_callback, auth, &client->localClient->ip);

  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 = NULL, *next_ptr = NULL;

  DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_list.head)
  {
    struct AuthRequest *auth = ptr->data;

    if (auth->timeout > CurrentTime)
      continue;

    if (IsDoingAuth(auth))
    {  
      ++ServerStats.is_abad;
      fd_close(&auth->fd);
      ClearAuth(auth);
      sendheader(auth->client, REPORT_FAIL_ID);
    }

    if (IsDNSPending(auth))
    {
      delete_resolver_queries(auth);
      ClearDNSPending(auth);
      sendheader(auth->client, REPORT_FAIL_DNS);
    }

    ilog(L_INFO, "DNS/AUTH timeout %s",
         get_client_name(auth->client, SHOW_IP));
    release_auth_client(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);
  uint16_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,
      &ulen) ||
      getpeername(auth->client->localClient->fd.fd, (struct sockaddr *)&them,
      &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
  
  snprintf(authbuf, sizeof(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
   */
  len = read(fd->fd, buf, AUTH_BUFSIZ);

  if (len < 0)
  {
    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);

  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);
  }

  release_auth_client(auth);
}

/*
 * delete_auth()
 */
void 
delete_auth(struct AuthRequest *auth)
{
  if (IsDNSPending(auth))
    delete_resolver_queries(auth);

  if (IsDoingAuth(auth))
    fd_close(&auth->fd);

  dlinkDelete(&auth->node, &auth_doing_list);
  BlockHeapFree(auth_heap, auth);
}
Revision:	1156
Committed:	Tue Aug 9 20:29:20 2011 UTC (14 years ago) by michael
Content type:	text/x-csrc
File size:	15479 byte(s)
Log Message:	- create ircd-hybrid-8 "branch"
#	Content
1	/*
2	* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3	* s_auth.c: Functions for querying a users ident.
4	*
5	* Copyright (C) 2002 by the past and present ircd coders, and others.
6	*
7	* This program is free software; you can redistribute it and/or modify
8	* it under the terms of the GNU General Public License as published by
9	* the Free Software Foundation; either version 2 of the License, or
10	* (at your option) any later version.
11	*
12	* This program is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	* GNU General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License
18	* along with this program; if not, write to the Free Software
19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20	* USA
21	*
22	* $Id$
23	*/
24
25	/*
26	* Changes:
27	* July 6, 1999 - Rewrote most of the code here. When a client connects
28	* to the server and passes initial socket validation checks, it
29	* is owned by this module (auth) which returns it to the rest of the
30	* server when dns and auth queries are finished. Until the client is
31	* released, the server does not know it exists and does not process
32	* any messages from it.
33	* --Bleep Thomas Helvey <tomh@inxpress.net>
34	*/
35	#include "stdinc.h"
36	#include "list.h"
37	#include "ircd_defs.h"
38	#include "fdlist.h"
39	#include "s_auth.h"
40	#include "s_conf.h"
41	#include "balloc.h"
42	#include "client.h"
43	#include "common.h"
44	#include "event.h"
45	#include "hook.h"
46	#include "irc_string.h"
47	#include "ircd.h"
48	#include "packet.h"
49	#include "irc_res.h"
50	#include "s_bsd.h"
51	#include "s_log.h"
52	#include "send.h"
53
54
55	static const char *HeaderMessages[] = {
56	":%s NOTICE AUTH :*** Looking up your hostname...",
57	":%s NOTICE AUTH :*** Found your hostname",
58	":%s NOTICE AUTH :*** Couldn't look up your hostname",
59	":%s NOTICE AUTH :*** Checking Ident",
60	":%s NOTICE AUTH :*** Got Ident response",
61	":%s NOTICE AUTH :*** No Ident response",
62	":%s NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.",
63	":%s NOTICE AUTH :*** Your hostname is too long, ignoring hostname"
64	};
65
66	enum {
67	REPORT_DO_DNS,
68	REPORT_FIN_DNS,
69	REPORT_FAIL_DNS,
70	REPORT_DO_ID,
71	REPORT_FIN_ID,
72	REPORT_FAIL_ID,
73	REPORT_IP_MISMATCH,
74	REPORT_HOST_TOOLONG
75	};
76
77	#define sendheader(c, i) sendto_one((c), HeaderMessages[(i)], me.name)
78
79	static BlockHeap *auth_heap = NULL;
80	static dlink_list auth_doing_list = { NULL, NULL, 0 };
81
82	static EVH timeout_auth_queries_event;
83
84	static PF read_auth_reply;
85	static CNCB auth_connect_callback;
86	static CBFUNC start_auth;
87
88	struct Callback *auth_cb = NULL;
89
90	/* init_auth()
91	*
92	* Initialise the auth code
93	*/
94	void
95	init_auth(void)
96	{
97	auth_heap = BlockHeapCreate("auth", sizeof(struct AuthRequest), AUTH_HEAP_SIZE);
98	auth_cb = register_callback("start_auth", start_auth);
99	eventAddIsh("timeout_auth_queries_event", timeout_auth_queries_event, NULL, 1);
100	}
101
102	/*
103	* make_auth_request - allocate a new auth request
104	*/
105	static struct AuthRequest *
106	make_auth_request(struct Client *client)
107	{
108	struct AuthRequest *request = BlockHeapAlloc(auth_heap);
109
110	client->localClient->auth = request;
111	request->client = client;
112	request->timeout = CurrentTime + CONNECTTIMEOUT;
113
114	return request;
115	}
116
117	/*
118	* release_auth_client - release auth client from auth system
119	* this adds the client into the local client lists so it can be read by
120	* the main io processing loop
121	*/
122	void
123	release_auth_client(struct AuthRequest *auth)
124	{
125	struct Client *client = auth->client;
126
127	if (IsDoingAuth(auth) \|\| IsDNSPending(auth))
128	return;
129
130	client->localClient->auth = NULL;
131	dlinkDelete(&auth->node, &auth_doing_list);
132	BlockHeapFree(auth_heap, auth);
133
134	/*
135	* When a client has auth'ed, we want to start reading what it sends
136	* us. This is what read_packet() does.
137	* -- adrian
138	*/
139	client->localClient->allow_read = MAX_FLOOD;
140	comm_setflush(&client->localClient->fd, 1000, flood_recalc, client);
141
142	dlinkAdd(client, &client->node, &global_client_list);
143
144	client->since = client->lasttime = client->firsttime = CurrentTime;
145	client->flags \|= FLAGS_FINISHED_AUTH;
146
147	read_packet(&client->localClient->fd, client);
148	}
149
150	/*
151	* auth_dns_callback - called when resolver query finishes
152	* if the query resulted in a successful search, name will contain
153	* a non-NULL pointer, otherwise name will be NULL.
154	* set the client on it's way to a connection completion, regardless
155	* of success of failure
156	*/
157	static void
158	auth_dns_callback(void vptr, const struct irc_ssaddr addr, const char *name)
159	{
160	struct AuthRequest *auth = vptr;
161
162	ClearDNSPending(auth);
163
164	if (name != NULL)
165	{
166	const struct sockaddr_in v4, v4dns;
167	#ifdef IPV6
168	const struct sockaddr_in6 v6, v6dns;
169	#endif
170	int good = 1;
171
172	#ifdef IPV6
173	if (auth->client->localClient->ip.ss.ss_family == AF_INET6)
174	{
175	v6 = (const struct sockaddr_in6 *)&auth->client->localClient->ip;
176	v6dns = (const struct sockaddr_in6 *)addr;
177	if (memcmp(&v6->sin6_addr, &v6dns->sin6_addr, sizeof(struct in6_addr)) != 0)
178	{
179	sendheader(auth->client, REPORT_IP_MISMATCH);
180	good = 0;
181	}
182	}
183	else
184	#endif
185	{
186	v4 = (const struct sockaddr_in *)&auth->client->localClient->ip;
187	v4dns = (const struct sockaddr_in *)addr;
188	if(v4->sin_addr.s_addr != v4dns->sin_addr.s_addr)
189	{
190	sendheader(auth->client, REPORT_IP_MISMATCH);
191	good = 0;
192	}
193	}
194	if (good && strlen(name) <= HOSTLEN)
195	{
196	strlcpy(auth->client->host, name,
197	sizeof(auth->client->host));
198	sendheader(auth->client, REPORT_FIN_DNS);
199	}
200	else if (strlen(name) > HOSTLEN)
201	sendheader(auth->client, REPORT_HOST_TOOLONG);
202	}
203	else
204	sendheader(auth->client, REPORT_FAIL_DNS);
205
206	release_auth_client(auth);
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	ClearAuth(auth);
220
221	sendheader(auth->client, REPORT_FAIL_ID);
222
223	release_auth_client(auth);
224	}
225
226	/*
227	* start_auth_query - Flag the client to show that an attempt to
228	* contact the ident server on
229	* the client's host. The connect and subsequently the socket are all put
230	* into 'non-blocking' mode. Should the connect or any later phase of the
231	* identifing process fail, it is aborted and the user is given a username
232	* of "unknown".
233	*/
234	static int
235	start_auth_query(struct AuthRequest *auth)
236	{
237	struct irc_ssaddr localaddr;
238	socklen_t locallen = sizeof(struct irc_ssaddr);
239	#ifdef IPV6
240	struct sockaddr_in6 *v6;
241	#else
242	struct sockaddr_in *v4;
243	#endif
244
245	/* open a socket of the same type as the client socket */
246	if (comm_open(&auth->fd, auth->client->localClient->ip.ss.ss_family,
247	SOCK_STREAM, 0, "ident") == -1)
248	{
249	report_error(L_ALL, "creating auth stream socket %s:%s",
250	get_client_name(auth->client, SHOW_IP), errno);
251	ilog(L_ERROR, "Unable to create auth socket for %s",
252	get_client_name(auth->client, SHOW_IP));
253	++ServerStats.is_abad;
254	return 0;
255	}
256
257	sendheader(auth->client, REPORT_DO_ID);
258
259	/*
260	* get the local address of the client and bind to that to
261	* make the auth request. This used to be done only for
262	* ifdef VIRTUAL_HOST, but needs to be done for all clients
263	* since the ident request must originate from that same address--
264	* and machines with multiple IP addresses are common now
265	*/
266	memset(&localaddr, 0, locallen);
267	getsockname(auth->client->localClient->fd.fd, (struct sockaddr*)&localaddr,
268	&locallen);
269
270	#ifdef IPV6
271	remove_ipv6_mapping(&localaddr);
272	v6 = (struct sockaddr_in6 *)&localaddr;
273	v6->sin6_port = htons(0);
274	#else
275	localaddr.ss_len = locallen;
276	v4 = (struct sockaddr_in *)&localaddr;
277	v4->sin_port = htons(0);
278	#endif
279	localaddr.ss_port = htons(0);
280
281	comm_connect_tcp(&auth->fd, auth->client->sockhost, 113,
282	(struct sockaddr *)&localaddr, localaddr.ss_len, auth_connect_callback,
283	auth, auth->client->localClient->ip.ss.ss_family,
284	GlobalSetOptions.ident_timeout);
285	return 1; /* We suceed here for now */
286	}
287
288	/*
289	* GetValidIdent - parse ident query reply from identd server
290	*
291	* Inputs - pointer to ident buf
292	* Output - NULL if no valid ident found, otherwise pointer to name
293	* Side effects -
294	*/
295	/*
296	* A few questions have been asked about this mess, obviously
297	* it should have been commented better the first time.
298	* The original idea was to remove all references to libc from ircd-hybrid.
299	* Instead of having to write a replacement for sscanf(), I did a
300	* rather gruseome parser here so we could remove this function call.
301	* Note, that I had also removed a few floating point printfs as well (though
302	* now we are still stuck with a few...)
303	* Remember, we have a replacement ircd sprintf, we have bleeps fputs lib
304	* it would have been nice to remove some unneeded code.
305	* Oh well. If we don't remove libc stuff totally, then it would be
306	* far cleaner to use sscanf()
307	*
308	* - Dianora
309	*/
310	static char *
311	GetValidIdent(char *buf)
312	{
313	int remp = 0;
314	int locp = 0;
315	char* colon1Ptr;
316	char* colon2Ptr;
317	char* colon3Ptr;
318	char* commaPtr;
319	char* remotePortString;
320
321	/* All this to get rid of a sscanf() fun. */
322	remotePortString = buf;
323
324	if ((colon1Ptr = strchr(remotePortString,':')) == NULL)
325	return 0;
326	*colon1Ptr = '\0';
327	colon1Ptr++;
328
329	if ((colon2Ptr = strchr(colon1Ptr,':')) == NULL)
330	return 0;
331	*colon2Ptr = '\0';
332	colon2Ptr++;
333
334	if ((commaPtr = strchr(remotePortString, ',')) == NULL)
335	return 0;
336	*commaPtr = '\0';
337	commaPtr++;
338
339	if ((remp = atoi(remotePortString)) == 0)
340	return 0;
341
342	if ((locp = atoi(commaPtr)) == 0)
343	return 0;
344
345	/* look for USERID bordered by first pair of colons */
346	if (strstr(colon1Ptr, "USERID") == NULL)
347	return 0;
348
349	if ((colon3Ptr = strchr(colon2Ptr,':')) == NULL)
350	return 0;
351	*colon3Ptr = '\0';
352	colon3Ptr++;
353	return (colon3Ptr);
354	}
355
356	/*
357	* start_auth
358	*
359	* inputs - pointer to client to auth
360	* output - NONE
361	* side effects - starts auth (identd) and dns queries for a client
362	*/
363	static void *
364	start_auth(va_list args)
365	{
366	struct Client client = va_arg(args, struct Client );
367	struct AuthRequest *auth = NULL;
368
369	assert(client != NULL);
370
371	auth = make_auth_request(client);
372	dlinkAdd(auth, &auth->node, &auth_doing_list);
373
374	sendheader(client, REPORT_DO_DNS);
375
376	SetDNSPending(auth);
377
378	if (ConfigFileEntry.disable_auth == 0)
379	{
380	SetDoingAuth(auth);
381	start_auth_query(auth);
382	}
383
384	gethost_byaddr(auth_dns_callback, auth, &client->localClient->ip);
385
386	return NULL;
387	}
388
389	/*
390	* timeout_auth_queries - timeout resolver and identd requests
391	* allow clients through if requests failed
392	*/
393	static void
394	timeout_auth_queries_event(void *notused)
395	{
396	dlink_node ptr = NULL, next_ptr = NULL;
397
398	DLINK_FOREACH_SAFE(ptr, next_ptr, auth_doing_list.head)
399	{
400	struct AuthRequest *auth = ptr->data;
401
402	if (auth->timeout > CurrentTime)
403	continue;
404
405	if (IsDoingAuth(auth))
406	{
407	++ServerStats.is_abad;
408	fd_close(&auth->fd);
409	ClearAuth(auth);
410	sendheader(auth->client, REPORT_FAIL_ID);
411	}
412
413	if (IsDNSPending(auth))
414	{
415	delete_resolver_queries(auth);
416	ClearDNSPending(auth);
417	sendheader(auth->client, REPORT_FAIL_DNS);
418	}
419
420	ilog(L_INFO, "DNS/AUTH timeout %s",
421	get_client_name(auth->client, SHOW_IP));
422	release_auth_client(auth);
423	}
424	}
425
426	/*
427	* auth_connect_callback() - deal with the result of comm_connect_tcp()
428	*
429	* If the connection failed, we simply close the auth fd and report
430	* a failure. If the connection suceeded send the ident server a query
431	* giving "theirport , ourport". The write is only attempted once so
432	* it is deemed to be a fail if the entire write doesn't write all the
433	* data given. This shouldnt be a problem since the socket should have
434	* a write buffer far greater than this message to store it in should
435	* problems arise. -avalon
436	*/
437	static void
438	auth_connect_callback(fde_t fd, int error, void data)
439	{
440	struct AuthRequest *auth = data;
441	struct irc_ssaddr us;
442	struct irc_ssaddr them;
443	char authbuf[32];
444	socklen_t ulen = sizeof(struct irc_ssaddr);
445	socklen_t tlen = sizeof(struct irc_ssaddr);
446	uint16_t uport, tport;
447	#ifdef IPV6
448	struct sockaddr_in6 *v6;
449	#else
450	struct sockaddr_in *v4;
451	#endif
452
453	if (error != COMM_OK)
454	{
455	auth_error(auth);
456	return;
457	}
458
459	if (getsockname(auth->client->localClient->fd.fd, (struct sockaddr *)&us,
460	&ulen) \|\|
461	getpeername(auth->client->localClient->fd.fd, (struct sockaddr *)&them,
462	&tlen))
463	{
464	ilog(L_INFO, "auth get{sock,peer}name error for %s",
465	get_client_name(auth->client, SHOW_IP));
466	auth_error(auth);
467	return;
468	}
469
470	#ifdef IPV6
471	v6 = (struct sockaddr_in6 *)&us;
472	uport = ntohs(v6->sin6_port);
473	v6 = (struct sockaddr_in6 *)&them;
474	tport = ntohs(v6->sin6_port);
475	remove_ipv6_mapping(&us);
476	remove_ipv6_mapping(&them);
477	#else
478	v4 = (struct sockaddr_in *)&us;
479	uport = ntohs(v4->sin_port);
480	v4 = (struct sockaddr_in *)&them;
481	tport = ntohs(v4->sin_port);
482	us.ss_len = ulen;
483	them.ss_len = tlen;
484	#endif
485
486	snprintf(authbuf, sizeof(authbuf), "%u , %u\r\n", tport, uport);
487
488	if (send(fd->fd, authbuf, strlen(authbuf), 0) == -1)
489	{
490	auth_error(auth);
491	return;
492	}
493
494	read_auth_reply(&auth->fd, auth);
495	}
496
497	/*
498	* read_auth_reply - read the reply (if any) from the ident server
499	* we connected to.
500	* We only give it one shot, if the reply isn't good the first time
501	* fail the authentication entirely. --Bleep
502	*/
503	#define AUTH_BUFSIZ 128
504
505	static void
506	read_auth_reply(fde_t fd, void data)
507	{
508	struct AuthRequest *auth = data;
509	char *s = NULL;
510	char *t = NULL;
511	int len;
512	int count;
513	char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
514
515	/* Why?
516	* Well, recv() on many POSIX systems is a per-packet operation,
517	* and we do not necessarily want this, because on lowspec machines,
518	* the ident response may come back fragmented, thus resulting in an
519	* invalid ident response, even if the ident response was really OK.
520	*
521	* So PLEASE do not change this code to recv without being aware of the
522	* consequences.
523	*
524	* --nenolod
525	*/
526	len = read(fd->fd, buf, AUTH_BUFSIZ);
527
528	if (len < 0)
529	{
530	if (ignoreErrno(errno))
531	comm_setselect(fd, COMM_SELECT_READ, read_auth_reply, auth, 0);
532	else
533	auth_error(auth);
534	return;
535	}
536
537	if (len > 0)
538	{
539	buf[len] = '\0';
540
541	if ((s = GetValidIdent(buf)))
542	{
543	t = auth->client->username;
544
545	while (s == '~' \|\| s == '^')
546	s++;
547
548	for (count = USERLEN; *s && count; s++)
549	{
550	if (*s == '@')
551	break;
552	if (!IsSpace(s) && s != ':' && *s != '[')
553	{
554	t++ = s;
555	count--;
556	}
557	}
558
559	*t = '\0';
560	}
561	}
562
563	fd_close(fd);
564
565	ClearAuth(auth);
566
567	if (s == NULL)
568	{
569	sendheader(auth->client, REPORT_FAIL_ID);
570	++ServerStats.is_abad;
571	}
572	else
573	{
574	sendheader(auth->client, REPORT_FIN_ID);
575	++ServerStats.is_asuc;
576	SetGotId(auth->client);
577	}
578
579	release_auth_client(auth);
580	}
581
582	/*
583	* delete_auth()
584	*/
585	void
586	delete_auth(struct AuthRequest *auth)
587	{
588	if (IsDNSPending(auth))
589	delete_resolver_queries(auth);
590
591	if (IsDoingAuth(auth))
592	fd_close(&auth->fd);
593
594	dlinkDelete(&auth->node, &auth_doing_list);
595	BlockHeapFree(auth_heap, auth);
596	}