/************************************************************************
* IRC - Internet Relay Chat, server/s_auth.c
* Copyright (C) 1992 Darren Reed
*
* 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: s_auth.c,v 1.3 2003/06/14 13:55:52 tr-ircd Exp $
*
* 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 "struct.h"
#include "common.h"
#include "s_auth.h"
#include "event.h"
#include "fd.h" /* fdlist_add */
#include "sys.h"
#include "h.h"
#include "numeric.h"
#include "packet.h"
#include "resnew.h"
#include "s_bsd.h"
#include "s_conf.h"
#include "config.h"
#include "dh.h"
dlink_list auth_client_list;
dlink_list auth_poll_list;
static EVH timeout_auth_queries_event;
static PF read_auth_reply;
static CNCB auth_connect_callback;
/*
* a bit different approach
* this replaces the original sendheader macros
*/
struct {
const char *message;
size_t length;
} HeaderMessages[] = {
/* 123456789012345678901234567890123456789012345678901234567890 */
{"NOTICE AUTH :*** Looking up your hostname...\r\n", 46},
{"NOTICE AUTH :*** Found your hostname\r\n", 38},
{"NOTICE AUTH :*** Found your hostname, cached\r\n", 46},
{"NOTICE AUTH :*** Couldn't look up your hostname\r\n", 49},
{"NOTICE AUTH :*** Checking Ident\r\n", 33},
{"NOTICE AUTH :*** Got Ident response\r\n", 37},
{"NOTICE AUTH :*** No Ident response\r\n", 36},
{"NOTICE AUTH :*** Your forward and reverse DNS do not match, ignoring hostname.\r\n", 80},
{"NOTICE AUTH :*** Your hostname is too long, ignoring hostname\r\n", 63},
{"NOTICE AUTH :*** This server runs an open proxy/wingate detection monitor from ", 79}, /* !!! Do not add \r\n */
{"NOTICE AUTH :*** If you do not accept this, disconnect now. Further information is available at ", 96}, /* Do not add \r\n */
};
typedef enum {
REPORT_DO_DNS,
REPORT_FIN_DNS,
REPORT_FIN_DNSC,
REPORT_FAIL_DNS,
REPORT_DO_ID,
REPORT_FIN_ID,
REPORT_FAIL_ID,
REPORT_IP_MISMATCH,
REPORT_HOST_TOOLONG,
REPORT_RUN_PROXYSCANNER,
REPORT_DISCONNECT,
} ReportType;
#ifdef HAVE_ENCRYPTION_ON
#define sendheader(c, r) \
if (IsSSL(c)) \
safe_SSL_write(c, HeaderMessages[(r)].message, HeaderMessages[(r)].length); \
else \
send((c)->fd, HeaderMessages[(r)].message, HeaderMessages[(r)].length, 0)
#define sendstring(c, t, l, n) \
if (IsSSL(c)) \
safe_SSL_write(c, t, l); \
else \
send((c)->fd, t, l, n);
#else
#define sendheader(c, r) send((c)->fd, HeaderMessages[(r)].message, HeaderMessages[(r)].length, 0)
#define sendstring(c, t, l, n) send((c)->fd, t, l, n)
#endif
/*
* init_auth()
*
* Initialise the auth code
*/
void init_auth(void)
{
memset(&auth_client_list, 0, sizeof(auth_client_list));
memset(&auth_poll_list, 0, sizeof(auth_poll_list));
eventAdd("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 = (struct AuthRequest *) MyMalloc(sizeof(struct AuthRequest));
request->fd = -1;
request->client = client;
request->timeout = timeofday + CONNECTTIMEOUT;
return request;
}
/*
* free_auth_request - cleanup auth request allocations
*/
void free_auth_request(struct AuthRequest *request)
{
MyFree(request);
}
/*
* unlink_auth_request - remove auth request from a list
*/
static void unlink_auth_request(struct AuthRequest *request, dlink_list * list)
{
dlink_node *ptr;
if ((ptr = dlinkFind(list, request)) != NULL) {
dlinkDelete(ptr, list);
free_dlink_node(ptr);
}
}
/*
* link_auth_request - add auth request to a list
*/
static void link_auth_request(struct AuthRequest *request, dlink_list * list)
{
dlink_node *m;
m = make_dlink_node();
dlinkAdd(request, m, list);
}
/*
* 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
*/
static void release_auth_client(struct Client *client)
{
if (client->fd > highest_fd)
highest_fd = client->fd;
/* This ensures that the client gets these notice about the scanner
* before any information from them is parsed. -TimeMr14C
*/
if (ServerOpts.wingate_notice && (ServerOpts.monitor_host_len > 0) && (ServerOpts.proxy_url_len > 0)) {
sendheader(client, REPORT_RUN_PROXYSCANNER);
sendstring(client, ServerOpts.monitor_host, ServerOpts.monitor_host_len, 0);
sendstring(client, "\r\n", 2, 0);
sendheader(client, REPORT_DISCONNECT);
sendstring(client, ServerOpts.proxy_url, ServerOpts.proxy_url_len, 0);
sendstring(client, "\r\n", 2, 0);
}
/*
* When a client has auth'ed, we want to start reading what it sends
* us. This is what read_packet() does.
* -- adrian
*/
client->allow_read = MAX_FLOOD_PER_SEC;
/* comm_setselect(client->fd, FDLIST_IRCD, COMM_SELECT_READ, read_client_packet, client, 0);
* is removed, and replaced with the read_client_packet call directly.
* -TimeMr14C: Taken from hybrid.
*/
comm_setflush(client->fd, 1000, flood_recalc, client);
add_client_to_list(client);
read_client_packet(client->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, adns_answer * reply)
{
struct AuthRequest *auth = (struct AuthRequest *) vptr;
char *str = auth->client->sockhost;
ClearDNSPending(auth);
if (reply && (reply->status == adns_s_ok)) {
if (strlen(*reply->rrs.str) < HOSTLEN) {
strcpy(str, *reply->rrs.str);
sendheader(auth->client, REPORT_FIN_DNS);
} else {
#ifdef IPV6
if (auth->client->aftype == AF_INET6) {
if (*auth->client->hostip == ':') {
strcpy(str, "0");
strcat(str, auth->client->hostip);
} else {
strcpy(str, auth->client->hostip);
}
strcat(str, ".");
} else
#endif
strcpy(str, auth->client->hostip);
sendheader(auth->client, REPORT_HOST_TOOLONG);
auth->client->protoflags |= PFLAGS_NONRESOLVED;
}
} else {
#ifdef IPV6
if (auth->client->aftype == AF_INET6) {
if (*auth->client->hostip == ':') {
strcpy(str, "0");
strcat(str, auth->client->hostip);
} else {
strcpy(str, auth->client->hostip);
}
strcat(str, ".");
} else
#endif
strcpy(str, auth->client->hostip);
sendheader(auth->client, REPORT_FAIL_DNS);
auth->client->protoflags |= PFLAGS_NONRESOLVED;
/* Used for the channelmode +N preventing
* non resolved addresses from joining */
}
MyFree(reply);
MyFree(auth->client->dns_query);
auth->client->dns_query = NULL;
if (!IsDoingAuth(auth)) {
struct Client *client_p = auth->client;
unlink_auth_request(auth, &auth_poll_list);
free_auth_request(auth);
release_auth_client(client_p);
}
}
/*
* authsenderr - handle auth send errors
*/
static void auth_error(struct AuthRequest *auth)
{
++ircstp->is_abad;
fd_close(auth->fd);
auth->fd = -1;
ClearAuth(auth);
sendheader(auth->client, REPORT_FAIL_ID);
if (!IsDNSPending(auth)) {
struct Client *client_p = auth->client;
unlink_auth_request(auth, &auth_poll_list);
free_auth_request(auth);
release_auth_client(client_p);
}
}
/*
* 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 sockaddr_in sock; */
struct irc_sockaddr localaddr;
socklen_t locallen = sizeof(struct irc_sockaddr);
int fd;
if ((fd = comm_open(DEF_FAM, SOCK_STREAM, 0, "ident")) == -1) {
report_error("creating auth stream socket %s:%s",
get_client_name(auth->client, TRUE), errno);
++ircstp->is_abad;
return 0;
}
if ((MAXCONNECTIONS - 10) < fd) {
sendto_lev(SNOTICE_LEV, "Can't allocate fd for auth on %s",
get_client_name(auth->client, TRUE));
fd_close(fd);
return 0;
}
sendheader(auth->client, REPORT_DO_ID);
if (!set_non_blocking(fd)) {
report_error(NONB_ERROR_MSG, get_client_name(auth->client, TRUE), errno);
fd_close(fd);
return 0;
}
/*
* 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->fd, (struct sockaddr *) &SOCKADDR(localaddr), (int *) &locallen);
S_PORT(localaddr) = htons(0);
auth->fd = fd;
SetAuthConnect(auth);
comm_connect_tcp(fd, auth->client->hostip, 113,
(struct sockaddr *) &SOCKADDR(localaddr), locallen,
auth_connect_callback, auth, DEF_FAM, ServerOpts.identd_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 -
*/
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;
colon1Ptr = strchr(remotePortString, ':');
if (!colon1Ptr)
return 0;
*colon1Ptr = '\0';
colon1Ptr++;
colon2Ptr = strchr(colon1Ptr, ':');
if (!colon2Ptr)
return 0;
*colon2Ptr = '\0';
colon2Ptr++;
commaPtr = strchr(remotePortString, ',');
if (!commaPtr)
return 0;
*commaPtr = '\0';
commaPtr++;
remp = atoi(remotePortString);
if (!remp)
return 0;
locp = atoi(commaPtr);
if (!locp)
return 0;
/* look for USERID bordered by first pair of colons */
if (!strstr(colon1Ptr, "USERID"))
return 0;
colon3Ptr = strchr(colon2Ptr, ':');
if (!colon3Ptr)
return 0;
*colon3Ptr = '\0';
colon3Ptr++;
return (colon3Ptr);
}
/*
* start_auth - starts auth (identd) and dns queries for a client
*/
void start_auth(struct Client *client)
{
struct AuthRequest *auth = 0;
assert(0 != client);
if (client == NULL)
return;
auth = make_auth_request(client);
client->dns_query = MyMalloc(sizeof(struct DNSQuery));
client->dns_query->ptr = auth;
client->dns_query->callback = auth_dns_callback;
sendheader(client, REPORT_DO_DNS);
/* No DNS cache now, remember? -- adrian */
adns_getaddr(&(client->ip), client->aftype, client->dns_query);
SetDNSPending(auth);
start_auth_query(auth);
link_auth_request(auth, &auth_poll_list);
}
/*
* 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;
struct Client *client_p;
for (ptr = auth_poll_list.head; ptr; ptr = next_ptr) {
next_ptr = ptr->next;
auth = ptr->data;
if (auth->timeout < timeofday) {
if (auth->fd >= 0)
fd_close(auth->fd);
if (IsDoingAuth(auth)) {
sendheader(auth->client, REPORT_FAIL_ID);
}
if (IsDNSPending(auth)) {
delete_adns_queries(auth->client->dns_query);
auth->client->dns_query->query = NULL;
sendheader(auth->client, REPORT_FAIL_DNS);
}
auth->client->since = timeofday;
dlinkDelete(ptr, &auth_poll_list);
free_dlink_node(ptr);
client_p = auth->client;
free_auth_request(auth);
release_auth_client(client_p);
}
}
}
/*
* 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(int fd, int error, void *data)
{
struct AuthRequest *auth = data;
struct sockaddr_in us;
struct sockaddr_in them;
char authbuf[32];
socklen_t ulen = sizeof(struct sockaddr_in);
socklen_t tlen = sizeof(struct sockaddr_in);
/* Check the error */
if (error != COMM_OK) {
/* We had an error during connection :( */
auth_error(auth);
return;
}
if (getsockname
(auth->client->fd, (struct sockaddr *) &us, (int *) &ulen) ||
getpeername(auth->client->fd, (struct sockaddr *) &them, (int *) &tlen)) {
auth_error(auth);
return;
}
ircsprintf(authbuf, "%u , %u\r\n",
(unsigned int) ntohs(them.sin_port), (unsigned int) ntohs(us.sin_port));
if (send(auth->fd, authbuf, strlen(authbuf), 0) == -1) {
auth_error(auth);
return;
}
ClearAuthConnect(auth);
SetAuthPending(auth);
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(int fd, void *data)
{
struct AuthRequest *auth = data;
char *s = (char *) NULL;
char *t = (char *) NULL;
int len;
int count;
char buf[AUTH_BUFSIZ + 1]; /* buffer to read auth reply into */
len = recv(auth->fd, buf, AUTH_BUFSIZ, 0);
if (len < 0 && ignoreErrno(errno)) {
comm_setselect(fd, FDLIST_IRCD, COMM_SELECT_READ,
read_auth_reply, auth, 0);
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(auth->fd);
auth->fd = -1;
ClearAuth(auth);
if (!s) {
++ircstp->is_abad;
strcpy(auth->client->username, "unknown");
} else {
sendheader(auth->client, REPORT_FIN_ID);
++ircstp->is_asuc;
SetGotId(auth->client);
}
if (!IsDNSPending(auth)) {
struct Client *client_p = auth->client;
unlink_auth_request(auth, &auth_poll_list);
free_auth_request(auth);
release_auth_client(client_p);
}
}
/*
* remove_auth_request()
* Remove request 'auth' from AuthClientList, and free it.
* There is no need to release auth->client since it has
* already been done
*/
void remove_auth_request(struct AuthRequest *auth)
{
unlink_auth_request(auth, &auth_client_list);
free_auth_request(auth);
} /* remove_auth_request() */
/*
* FindAuthClient()
* Find the client matching 'id' in the AuthClientList. The
* id will match the memory address of the client structure.
*/
struct AuthRequest *
/* XXX This is just wrong, should be a *void at least */
FindAuthClient(long id)
{
dlink_node *ptr;
struct AuthRequest *auth;
for (ptr = auth_client_list.head; ptr; ptr = ptr->next) {
auth = ptr->data;
if (auth->client == (struct Client *) id)
return auth;
}
return (NULL);
} /* FindAuthClient() */
/*
* delete_identd_queries()
*
*/
void delete_identd_queries(struct Client *target_p)
{
dlink_node *ptr;
dlink_node *next_ptr;
struct AuthRequest *auth;
for (ptr = auth_poll_list.head; ptr; ptr = next_ptr) {
auth = ptr->data;
next_ptr = ptr->next;
if (auth->client == target_p) {
if (auth->fd >= 0)
fd_close(auth->fd);
dlinkDelete(ptr, &auth_poll_list);
free_auth_request(auth);
free_dlink_node(ptr);
}
}
for (ptr = auth_client_list.head; ptr; ptr = next_ptr) {
auth = ptr->data;
next_ptr = ptr->next;
if (auth->client == target_p) {
if (auth->fd >= 0)
fd_close(auth->fd);
dlinkDelete(ptr, &auth_client_list);
free_auth_request(auth);
free_dlink_node(ptr);
}
}
}
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