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Add heuristics for SOCKSv5 UDPASSOC client request behavior

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This commit is contained in:
z3APA3A 2020-11-18 02:21:06 +03:00
parent 2b1025a79b
commit 45dcbff86f
1 changed files with 29 additions and 3 deletions
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32
src/socks.c
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@ -33,6 +33,7 @@ void * sockschild(struct clientparam* param) {
struct sockaddr_in sin = {AF_INET};
#endif
int len;
int heur = 0;
param->service = S_SOCKS;
@ -123,6 +124,15 @@ void * sockschild(struct clientparam* param) {
RETURN(431);
}
myinet_ntop(*SAFAMILY(&param->sinsr), SAADDR(&param->sinsr), buf, 64);
if(command == 3){
if(*SAFAMILY(&param->req) == *SAFAMILY(&param->sincr) && !memcmp(SAADDR(&param->req),SAADDR(&param->sincr), SAADDRLEN(&param->req))){
heur = 1;
}
else if (!SAISNULL(&param->req)){
heur = 2;
}
}
break;
case 3:
if ((size = sockgetcharcli(param, conf.timeouts[SINGLEBYTE_S], 0)) == EOF) {RETURN(451);} /* nmethods */
@ -330,7 +340,7 @@ fflush(stderr);
param->sinsr = param->req;
myfree(buf);
if(!(buf = myalloc(LARGEBUFSIZE))) {RETURN(21);}
sin = param->sincr;
sin = (heur == 1)?param->req:param->sincr;
fds[2].events = fds[1].events = fds[0].events = 0;
fds[0].fd = param->remsock;
@ -346,11 +356,20 @@ fflush(stderr);
if(len < 10) continue;
sasize = sizeof(sin);
if((len = so._recvfrom(param->clisock, (char *)buf, 65535, 0, (struct sockaddr *)&sin, &sasize)) <= 10) {
if(len <= 10) {
param->res = 464;
break;
}
if(SAADDRLEN(&sin) != SAADDRLEN(&param->sincr) || memcmp(SAADDR(&sin), SAADDR(&param->sincr), SAADDRLEN(&sin))){
if(SAADDRLEN(&sin) != SAADDRLEN(&param->sincr) || memcmp(SAADDR(&sin), SAADDR(&param->sincr), SAADDRLEN(&sin)) || (heur == 1 && *SAPORT(&param->sincr)!=*SAPORT(&sin))){
if(heur == 1){
#if SOCKSTRACE > 0
fprintf(stderr, "internal UDP packet ignored\n");
fflush(stderr);
#endif
sin = param->req;
continue;
}
param->res = 465;
break;
}
@ -422,6 +441,13 @@ fflush(stderr);
fds[0].events = fds[0].revents = 0;
param->statssrv64+=len;
param->nreads++;
if(heur == 2 && (*SAFAMILY(&param->sinsr) != *SAFAMILY(&param->req) || memcmp(SAADDR(&param->sinsr),SAADDR(&param->req), SAADDRLEN(&param->req)))){
#if SOCKSTRACE > 0
fprintf(stderr, "external UDP packet ignored\n");
fflush(stderr);
#endif
continue;
}
memcpy(buf+4, SAADDR(&param->sinsr), SAADDRLEN(&param->sinsr));
memcpy(buf+4+SAADDRLEN(&param->sinsr), SAPORT(&param->sinsr), 2);
sasize = sizeof(sin);