3 Copyright (C) 2004-2007 Chris Porter.
10 #include <sys/types.h>
11 #include <sys/socket.h>
14 #include <sys/ioctl.h>
18 #include <netinet/in.h>
19 #include <arpa/inet.h>
21 #include "../lib/sstring.h"
22 #include "../lib/irc_string.h"
23 #include "../core/config.h"
24 #include "../core/events.h"
25 #include "../lib/version.h"
27 #include "nterfacer.h"
30 MODULE_VERSION("1.1p" PROTOCOL_VERSION
);
32 struct service_node
*tree
= NULL
;
33 struct esocket_events nterfacer_events
;
34 struct esocket
*nterfacer_sock
;
35 struct rline
*rlines
= NULL
;
36 unsigned short nterfacer_token
= BLANK_TOKEN
;
37 struct nterface_auto_log
*nrl
;
39 struct service_node
*ping
= NULL
;
41 struct permitted
*permits
;
44 int ping_handler(struct rline
*ri
, int argc
, char **argv
);
45 static void nterfacer_sendcallback(struct rline
*ri
, int error
, char *buf
);
49 int debug_mode
= getcopyconfigitemintpositive("nterfacer", "debug", 0);
51 nrl
= nterface_open_log("nterfacer", "logs/nterfacer.log", debug_mode
);
53 loaded
= load_permits();
54 nterface_log(nrl
, NL_INFO
, "Loaded %d permit%s successfully.", loaded
, loaded
==1?"":"s");
59 nterfacer_events
.on_accept
= nterfacer_accept_event
;
60 nterfacer_events
.on_line
= nterfacer_line_event
;
61 nterfacer_events
.on_disconnect
= NULL
;
63 nterfacer_token
= esocket_token();
65 ping
= register_service("nterfacer");
69 register_handler(ping
, "ping", 0, ping_handler
);
72 accept_fd
= setup_listening_socket();
74 nterface_log(nrl
, NL_ERROR
, "Unable to setup listening socket!");
76 nterfacer_sock
= esocket_add(accept_fd
, ESOCKET_UNIX_DOMAIN
, &nterfacer_events
, nterfacer_token
);
79 /* the main unix domain socket must NOT have a disconnect event. */
80 nterfacer_events
.on_disconnect
= nterfacer_disconnect_event
;
83 void free_handler(struct handler
*hp
) {
84 struct rline
*li
, *pi
= NULL
;
87 if(li
->handler
== hp
) {
89 esocket_write_line(li
->socket
, "%d,OE%d,%s", li
->id
, BF_UNLOADED
, "Service was unloaded.");
90 } else if(li
->callback
) {
91 nterfacer_sendcallback(li
, BF_UNLOADED
, "Service was unloaded.");
107 freesstring(hp
->command
);
111 void free_handlers(struct service_node
*tp
) {
112 struct handler
*hp
, *lp
;
114 for(hp
=tp
->handlers
;hp
;) {
124 struct service_node
*tp
, *lp
;
128 deregister_service(ping
);
138 if((accept_fd
!= -1) && nterfacer_sock
) {
139 esocket_clean_by_token(nterfacer_token
);
140 nterfacer_sock
= NULL
;
144 if(permits
&& permit_count
) {
145 for(i
=0;i
<permit_count
;i
++) {
146 freesstring(permits
[i
].hostname
);
147 freesstring(permits
[i
].password
);
154 nrl
= nterface_close_log(nrl
);
155 nscheckfreeall(POOL_NTERFACER
);
158 int load_permits(void) {
159 int loaded_lines
= 0, i
, j
;
160 struct permitted
*new_permits
, *resized
, *item
;
161 struct hostent
*host
;
162 array
*hostnamesa
, *passwordsa
;
163 sstring
**hostnames
, **passwords
;
165 hostnamesa
= getconfigitems("nterfacer", "hostname");
166 passwordsa
= getconfigitems("nterfacer", "password");
167 if(!hostnamesa
|| !passwordsa
)
169 if(hostnamesa
->cursi
!= passwordsa
->cursi
) {
170 nterface_log(nrl
, NL_ERROR
, "Different number of hostnames/passwords in config file.");
174 hostnames
= (sstring
**)hostnamesa
->content
;
175 passwords
= (sstring
**)passwordsa
->content
;
177 new_permits
= ntmalloc(hostnamesa
->cursi
* sizeof(struct permitted
));
178 memset(new_permits
, 0, hostnamesa
->cursi
* sizeof(struct permitted
));
181 for(i
=0;i
<hostnamesa
->cursi
;i
++) {
182 item
->hostname
= getsstring(hostnames
[i
]->content
, hostnames
[i
]->length
);
184 host
= gethostbyname(item
->hostname
->content
);
186 nterface_log(nrl
, NL_WARNING
, "Couldn't resolve hostname: %s (item %d).", item
->hostname
->content
, i
+ 1);
187 freesstring(item
->hostname
);
191 item
->ihost
= (*(struct in_addr
*)host
->h_addr
).s_addr
;
192 for(j
=0;j
<loaded_lines
;j
++) {
193 if(new_permits
[j
].ihost
== item
->ihost
) {
194 nterface_log(nrl
, NL_WARNING
, "Host with items %d and %d is identical, dropping item %d.", j
+ 1, i
+ 1, i
+ 1);
200 freesstring(item
->hostname
);
204 item
->password
= getsstring(passwords
[i
]->content
, passwords
[i
]->length
);
205 nterface_log(nrl
, NL_DEBUG
, "Loaded permit, hostname: %s.", item
->hostname
->content
);
216 resized
= ntrealloc(new_permits
, sizeof(struct permitted
) * loaded_lines
);
223 permit_count
= loaded_lines
;
228 int setup_listening_socket(void) {
229 struct sockaddr_in sin
;
231 unsigned int opt
= 1;
233 fd
= socket(AF_INET
, SOCK_STREAM
, 0);
235 /* also shamelessly ripped from proxyscan */
237 nterface_log(nrl
, NL_ERROR
, "Unable to open listening socket (%d).", errno
);
241 if(setsockopt(fd
, SOL_SOCKET
, SO_REUSEADDR
, (const char *) &opt
, sizeof(opt
)) != 0) {
242 nterface_log(nrl
, NL_ERROR
, "Unable to set SO_REUSEADDR on listen socket.");
246 /* Initialiase the addresses */
247 memset(&sin
, 0, sizeof(sin
));
248 sin
.sin_family
= AF_INET
;
249 sin
.sin_port
= htons(getcopyconfigitemintpositive("nterfacer", "port", NTERFACER_PORT
));
251 if(bind(fd
, (struct sockaddr
*) &sin
, sizeof(sin
))) {
252 nterface_log(nrl
, NL_ERROR
, "Unable to bind listen socket (%d).", errno
);
258 if(ioctl(fd
, FIONBIO
, &opt
)) {
259 nterface_log(nrl
, NL_ERROR
, "Unable to set listen socket non-blocking.");
266 struct service_node
*register_service(char *name
) {
267 struct service_node
*np
= ntmalloc(sizeof(service_node
));
270 np
->name
= getsstring(name
, strlen(name
));
284 struct handler
*register_handler(struct service_node
*service
, char *command
, int args
, handler_function fp
) {
285 struct handler
*hp
= ntmalloc(sizeof(handler
));
288 hp
->command
= getsstring(command
, strlen(command
));
298 hp
->next
= service
->handlers
;
299 hp
->service
= service
;
300 service
->handlers
= hp
;
305 void deregister_handler(struct handler
*hl
) {
306 struct service_node
*service
= (struct service_node
*)hl
->service
;
307 struct handler
*np
, *lp
= NULL
;
308 for(np
=service
->handlers
;np
;lp
=np
,np
=np
->next
) {
313 service
->handlers
= np
->next
;
321 void deregister_service(struct service_node
*service
) {
322 struct service_node
*sp
, *lp
= NULL
;
324 for(sp
=tree
;sp
;lp
=sp
,sp
=sp
->next
) {
335 if(!sp
) /* already freed */
338 free_handlers(service
);
340 freesstring(service
->name
);
345 void nterfacer_accept_event(struct esocket
*socket
) {
346 struct sockaddr_in sin
;
347 unsigned int addrsize
= sizeof(sin
);
348 int newfd
= accept(socket
->fd
, (struct sockaddr
*)&sin
, &addrsize
), i
;
349 struct sconnect
*temp
;
350 struct permitted
*item
= NULL
;
351 struct esocket
*newsocket
;
352 unsigned int opt
= 1;
355 nterface_log(nrl
, NL_WARNING
, "Unable to accept nterfacer fd!");
359 if(ioctl(newfd
, FIONBIO
, &opt
)) {
360 nterface_log(nrl
, NL_ERROR
, "Unable to set accepted socket non-blocking.");
364 for(i
=0;i
<permit_count
;i
++) {
365 if(permits
[i
].ihost
== sin
.sin_addr
.s_addr
) {
372 nterface_log(nrl
, NL_INFO
, "Unauthorised connection from %s closed", inet_ntoa(sin
.sin_addr
));
377 temp
= (struct sconnect
*)ntmalloc(sizeof(struct sconnect
));
384 /* do checks on hostname first */
386 newsocket
= esocket_add(newfd
, ESOCKET_UNIX_DOMAIN_CONNECTED
, &nterfacer_events
, nterfacer_token
);
392 newsocket
->tag
= temp
;
394 nterface_log(nrl
, NL_INFO
, "New connection from %s.", item
->hostname
->content
);
396 temp
->status
= SS_IDLE
;
399 esocket_write_line(newsocket
, "nterfacer " PROTOCOL_VERSION
);
402 void derive_key(unsigned char *out
, char *password
, char *segment
, unsigned char *noncea
, unsigned char *nonceb
, unsigned char *extra
, int extralen
) {
405 SHA256_Update(&c
, (unsigned char *)password
, strlen(password
));
406 SHA256_Update(&c
, (unsigned char *)":", 1);
407 SHA256_Update(&c
, (unsigned char *)segment
, strlen(segment
));
408 SHA256_Update(&c
, (unsigned char *)":", 1);
409 SHA256_Update(&c
, noncea
, 16);
410 SHA256_Update(&c
, (unsigned char *)":", 1);
411 SHA256_Update(&c
, nonceb
, 16);
412 SHA256_Update(&c
, (unsigned char *)":", 1);
413 SHA256_Update(&c
, extra
, extralen
);
414 SHA256_Final(out
, &c
);
417 SHA256_Update(&c
, out
, 32);
418 SHA256_Final(out
, &c
);
421 int nterfacer_line_event(struct esocket
*sock
, char *newline
) {
422 struct sconnect
*socket
= sock
->tag
;
423 char *response
, *theirnonceh
= NULL
, *theirivh
= NULL
;
424 unsigned char theirnonce
[16], theiriv
[16];
427 switch(socket
->status
) {
429 if(strcasecmp(newline
, ANTI_FULL_VERSION
)) {
430 nterface_log(nrl
, NL_INFO
, "Protocol mismatch from %s: %s", socket
->permit
->hostname
->content
, newline
);
433 unsigned char challenge
[32];
434 char ivhex
[16 * 2 + 1], noncehex
[16 * 2 + 1];
436 if(!get_entropy(challenge
, 32) || !get_entropy(socket
->iv
, 16)) {
437 nterface_log(nrl
, NL_ERROR
, "Unable to open challenge/IV entropy bin!");
441 int_to_hex(challenge
, socket
->challenge
, 32);
442 int_to_hex(socket
->iv
, ivhex
, 16);
444 memcpy(socket
->response
, challenge_response(socket
->challenge
, socket
->permit
->password
->content
), sizeof(socket
->response
));
445 socket
->response
[sizeof(socket
->response
) - 1] = '\0'; /* just in case */
447 socket
->status
= SS_VERSIONED
;
448 if(!generate_nonce(socket
->ournonce
, 1)) {
449 nterface_log(nrl
, NL_ERROR
, "Unable to generate nonce!");
452 int_to_hex(socket
->ournonce
, noncehex
, 16);
454 if(esocket_write_line(sock
, "%s %s %s", socket
->challenge
, ivhex
, noncehex
))
460 for(response
=newline
;*response
;response
++) {
461 if((*response
== ' ') && (*(response
+ 1))) {
463 theirivh
= response
+ 1;
469 for(response
=theirivh
;*response
;response
++) {
470 if((*response
== ' ') && (*(response
+ 1))) {
472 theirnonceh
= response
+ 1;
478 if(!theirivh
|| (strlen(theirivh
) != 32) || !hex_to_int(theirivh
, theiriv
, sizeof(theiriv
)) ||
479 !theirnonceh
|| (strlen(theirnonceh
) != 32) || !hex_to_int(theirnonceh
, theirnonce
, sizeof(theirnonce
))) {
480 nterface_log(nrl
, NL_INFO
, "Protocol error drop: %s", socket
->permit
->hostname
->content
);
484 if(!memcmp(socket
->ournonce
, theirnonce
, sizeof(theirnonce
))) {
485 nterface_log(nrl
, NL_INFO
, "Bad nonce drop: %s", socket
->permit
->hostname
->content
);
489 if(!strncasecmp(newline
, socket
->response
, sizeof(socket
->response
))) {
490 unsigned char theirkey
[32], ourkey
[32];
492 derive_key(ourkey
, socket
->permit
->password
->content
, socket
->challenge
, socket
->ournonce
, theirnonce
, (unsigned char *)"SERVER", 6);
494 derive_key(theirkey
, socket
->permit
->password
->content
, socket
->response
, theirnonce
, socket
->ournonce
, (unsigned char *)"CLIENT", 6);
495 nterface_log(nrl
, NL_INFO
, "Authed: %s", socket
->permit
->hostname
->content
);
496 socket
->status
= SS_AUTHENTICATED
;
497 switch_buffer_mode(sock
, ourkey
, socket
->iv
, theirkey
, theiriv
);
499 if(esocket_write_line(sock
, "Oauth"))
502 nterface_log(nrl
, NL_INFO
, "Bad CR drop: %s", socket
->permit
->hostname
->content
);
507 case SS_AUTHENTICATED
:
508 nterface_log(nrl
, NL_INFO
|NL_LOG_ONLY
, "L(%s): %s", socket
->permit
->hostname
->content
, newline
);
509 reason
= nterfacer_new_rline(newline
, sock
, &number
);
511 if(reason
== RE_SOCKET_ERROR
)
513 if(reason
!= RE_BAD_LINE
) {
514 if(esocket_write_line(sock
, "%d,E%d,%s", number
, reason
, request_error(reason
)))
527 int nterfacer_new_rline(char *line
, struct esocket
*socket
, int *number
) {
528 char *sp
, *p
, *parsebuf
= NULL
, *pp
, commandbuf
[MAX_BUFSIZE
], *args
[MAX_ARGS
], *newp
;
530 struct service_node
*service
;
531 struct rline
*prequest
;
535 if(!line
|| !line
[0] || (line
[0] == ','))
538 for(sp
=line
;*sp
;sp
++)
542 if(!*sp
|| !*(sp
+ 1))
547 for(service
=tree
;service
;service
=service
->next
)
548 if(!strcmp(service
->name
->content
, line
))
559 *number
= positive_atoi(sp
+ 1);
561 if((*number
< 1) || (*number
> 0xffff))
565 nterface_log(nrl
, NL_DEBUG
, "Unable to find service: %s", line
);
566 return RE_SERVICER_NOT_FOUND
;
571 for(pp
=p
+1;*pp
;pp
++) {
572 if((*pp
== '\\') && *(pp
+ 1)) {
573 if(*(pp
+ 1) == ',') {
575 } else if(*(pp
+ 1) == '\\') {
579 } else if(*pp
== ',') {
586 if(*pp
== '\0') { /* if we're at the end already, we have no arguments */
589 argcount
= 1; /* we have a comma, so we have one already */
594 for(hl
=service
->handlers
;hl
;hl
=hl
->next
)
595 if(!strncmp(hl
->command
->content
, commandbuf
, sizeof(commandbuf
)))
599 return RE_COMMAND_NOT_FOUND
;
602 parsebuf
= (char *)ntmalloc(strlen(pp
) + 1);
603 MemCheckR(parsebuf
, RE_MEM_ERROR
);
606 for(newp
=args
[0]=parsebuf
,pp
++;*pp
;pp
++) {
607 if((*pp
== '\\') && *(pp
+ 1)) {
608 if(*(pp
+ 1) == ',') {
610 } else if(*(pp
+ 1) == '\\') {
614 } else if(*pp
== ',') {
616 args
[argcount
++] = newp
;
617 if(argcount
> MAX_ARGS
) {
619 return RE_TOO_MANY_ARGS
;
627 if(argcount
< hl
->args
) {
628 if(argcount
&& parsebuf
)
630 return RE_WRONG_ARG_COUNT
;
633 prequest
= (struct rline
*)ntmalloc(sizeof(struct rline
));
636 if(argcount
&& parsebuf
)
641 prequest
->service
= service
;
642 prequest
->handler
= hl
;
643 prequest
->buf
[0] = '\0';
644 prequest
->curpos
= prequest
->buf
;
645 prequest
->tag
= NULL
;
646 prequest
->id
= *number
;
647 prequest
->next
= rlines
;
648 prequest
->socket
= socket
;
649 prequest
->callback
= NULL
;
652 re
= (hl
->function
)(prequest
, argcount
, args
);
654 if(argcount
&& parsebuf
)
660 void nterfacer_disconnect_event(struct esocket
*sock
) {
661 struct sconnect
*socket
= sock
->tag
;
665 nterface_log(nrl
, NL_INFO
, "Disconnected from %s.", socket
->permit
->hostname
->content
);
668 for(li
=rlines
;li
;li
=li
->next
)
669 if(li
->socket
&& (li
->socket
->tag
== socket
))
675 int ri_append(struct rline
*li
, char *format
, ...) {
676 char buf
[MAX_BUFSIZE
], escapedbuf
[MAX_BUFSIZE
* 2 + 1], *p
, *tp
;
677 int sizeleft
= sizeof(li
->buf
) - (li
->curpos
- li
->buf
);
680 va_start(ap
, format
);
682 if(vsnprintf(buf
, sizeof(buf
), format
, ap
) >= sizeof(buf
)) {
689 for(tp
=escapedbuf
,p
=buf
;*p
||(*tp
='\0');*tp
++=*p
++)
690 if((*p
== ',') || (*p
== '\\'))
694 if(li
->curpos
== li
->buf
) {
695 li
->curpos
+=snprintf(li
->curpos
, sizeleft
, "%s", escapedbuf
);
697 li
->curpos
+=snprintf(li
->curpos
, sizeleft
, ",%s", escapedbuf
);
701 if(sizeof(li
->buf
) - (li
->curpos
- li
->buf
) > 0) {
708 int ri_error(struct rline
*li
, int error_code
, char *format
, ...) {
709 char buf
[MAX_BUFSIZE
], escapedbuf
[MAX_BUFSIZE
* 2 + 1], *p
, *tp
;
710 struct rline
*pp
, *lp
= NULL
;
714 if(li
->socket
|| li
->callback
) {
715 va_start(ap
, format
);
716 vsnprintf(buf
, sizeof(buf
), format
, ap
);
719 for(tp
=escapedbuf
,p
=buf
;*p
||(*tp
='\0');*tp
++=*p
++)
720 if((*p
== ',') || (*p
== '\\'))
723 if(esocket_write_line(li
->socket
, "%d,OE%d,%s", li
->id
, error_code
, escapedbuf
))
724 retval
= RE_SOCKET_ERROR
;
726 if(error_code
== 0) /* :P */
729 nterfacer_sendcallback(li
, error_code
, escapedbuf
);
733 for(pp
=rlines
;pp
;lp
=pp
,pp
=pp
->next
) {
748 int ri_final(struct rline
*li
) {
749 struct rline
*pp
, *lp
= NULL
;
753 if(esocket_write_line(li
->socket
, "%d,OO%s", li
->id
, li
->buf
))
754 retval
= RE_SOCKET_ERROR
;
755 } else if(li
->callback
) {
756 nterfacer_sendcallback(li
, 0, li
->buf
);
759 for(pp
=rlines
;pp
;lp
=pp
,pp
=pp
->next
) {
774 int ping_handler(struct rline
*ri
, int argc
, char **argv
) {
779 void *nterfacer_sendline(char *service
, char *command
, int argc
, char **argv
, rline_callback callback
, void *tag
) {
780 struct service_node
*servicep
;
781 struct rline
*prequest
;
785 for(servicep
=tree
;servicep
;servicep
=servicep
->next
)
786 if(!strcmp(servicep
->name
->content
, service
))
790 Error("nterfacer", ERR_WARNING
, "sendline: service not found: %s", service
);
794 for(hl
=servicep
->handlers
;hl
;hl
=hl
->next
)
795 if(!strcmp(hl
->command
->content
, command
))
799 Error("nterfacer", ERR_WARNING
, "sendline: command not found: %s", command
);
803 if(argc
< hl
->args
) {
804 Error("nterfacer", ERR_WARNING
, "sendline: wrong number of arguments: %s", command
);
808 prequest
= (struct rline
*)ntmalloc(sizeof(struct rline
));
814 prequest
->service
= servicep
;
815 prequest
->handler
= hl
;
816 prequest
->buf
[0] = '\0';
817 prequest
->curpos
= prequest
->buf
;
820 prequest
->next
= rlines
;
821 prequest
->socket
= NULL
;
822 prequest
->callback
= callback
;
825 re
= (hl
->function
)(prequest
, argc
, argv
);
828 Error("nterfacer", ERR_WARNING
, "sendline: error occured calling %s %d: %s", command
, re
, request_error(re
));
832 return (void *)prequest
;
835 void nterfacer_freeline(void *tag
) {
836 struct rline
*prequest
= tag
;
838 prequest
->callback
= NULL
;
841 #define MAX_LINES 8192
844 static void nterfacer_sendcallback(struct rline
*ri
, int error
, char *buf
) {
845 char *lines
[MAX_LINES
+1];
846 char newbuf
[MAX_BUFSIZE
+5];
847 char *s
, *d
, *laststart
;
850 for(s
=buf
,laststart
=d
=newbuf
;*s
;s
++) {
851 if((*s
== '\\') && *(s
+ 1)) {
852 if(*(s
+ 1) == ',') {
854 } else if(*(s
+ 1) == '\\') {
858 } else if(*s
== ',') {
860 if(linec
>= MAX_LINES
- 5) {
861 nterfacer_sendcallback(ri
, BF_OVER
, "Buffer overflow.");
865 lines
[linec
++] = laststart
;
872 lines
[linec
++] = laststart
;
874 ri
->callback(error
, linec
, lines
, ri
->tag
);