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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center">               ● UNIX网络编程                       (BM: clown)                </font></big></big></td></tr>
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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="15.htm">上一层</a>][<a href="562.htm">下一篇</a>]
<hr><p align="left"><small>发信人: cloudsky (小四), 信区: Security <br>

标  题: RPC/XDR/NFS系列之----RPC编程初战(3) <br>

发信站: 武汉白云黄鹤站 (Wed Feb 23 17:20:06 2000), 站内信件 <br>

标题：RPC/XDR/NFS系列之----RPC编程初战(3) <br>

概述： <br>

    对(2)中代码修改后得到的rpcscan.c <br>

    参看本系列之 <br>

    << RPC/XDR/NFS系列之----rpcinfo利用 >> <br>

    << RPC/XDR/NFS系列之----RPC编程初战(2) >> <br>

测试： <br>

    RedHat6.0 <br>

程序： <br>

/* <br>

File Name: rpcscan.c <br>

Author   : unknown <br>

Test     : Linux 2.2.5 <br>

Compile  : gcc -pipe -O3 -o rpcscan rpcscan.c <br>

Usage    : rpcscan <startIp> <endIp> <rpcServerNumber> <br>

Date     : 2000/02/23 <br>

*/ <br>

#include <sys/types.h> <br>

#include <unistd.h> <br>

#include <malloc.h> <br>



#include <stdio.h> <br>

#include <netdb.h> <br>

#include <stdlib.h> <br>

#include <signal.h> <br>

#include <rpc/rpc.h> <br>

#include <arpa/inet.h> <br>

#include <sys/socket.h> <br>

#include <netinet/in.h> <br>

#include <netinet/ip.h> <br>

#include <rpc/pmap_prot.h> <br>

#include <rpc/pmap_clnt.h> <br>

#define MAX_IP_LEN 15  /* xxx.xxx.xxx.xxx 长度15个字节 */ <br>

struct ipoctet <br>

{ <br>

    char a[4]; <br>

    char b[4]; <br>

    char c[4]; <br>

    char d[4]; <br>

}; <br>

struct ipocteti <br>

{ <br>

    int a; <br>

    int a; <br>

    int b; <br>

    int c; <br>

    int d; <br>

}; <br>

void doNothing ( int arg ) <br>

{ <br>

    return; <br>

}  /* end of doNothing */ <br>

u_long resolveHost ( char * host ) <br>

{ <br>

    struct hostent * he; <br>

    unsigned long    ip; <br>

    if( ( he = gethostbyname( host ) ) == NULL ) <br>

    { <br>

        ip = inet_addr( host );  /* 网络字节顺序 */ <br>

        if ( ip == INADDR_NONE ) <br>

        { <br>

            ip = 0; <br>

        } <br>

    } <br>

    else <br>

    { <br>

    { <br>

        bcopy( he->h_addr_list[0], &ip, sizeof( unsigned long ) ); <br>

    } <br>

    return( ip ); <br>

}  /* end of resolveHost */ <br>

int rpcServerDump ( char * host, int rpcServerNumber ) <br>

{ <br>

    struct sockaddr_in server_addr; <br>

    struct pmaplist *  head      = NULL; <br>

    int                rpcsocket = RPC_ANYSOCK; <br>

    struct timeval     minutetimeout; <br>

    register CLIENT *  clientHandle; <br>

    struct rpcent *    rpc; <br>

    server_addr.sin_addr.s_addr = resolveHost( host );  /* 获得远程主机IP地址 <br>

 */ <br>

    server_addr.sin_family      = AF_INET;              /* 只能是这个地址族 <br>

*/ <br>

    server_addr.sin_port        = htons( PMAPPORT );    /* 111端口 */ <br>

    minutetimeout.tv_sec        = 15; <br>

    minutetimeout.tv_usec       = 0; <br>

    /* cause clnttcp_create uses connect() */ <br>

    signal( SIGALRM, doNothing ); <br>

    alarm( 15 ); <br>



    /* 创建句柄 */ <br>

    if ( ( clientHandle = clnttcp_create( &server_addr, <br>

         PMAPPROG, PMAPVERS, &rpcsocket, 50, 500 ) ) == NULL ) <br>

    { <br>

        alarm( 0 ); <br>

        signal( SIGALRM, SIG_DFL ); <br>

        return( 0 ); <br>

    } <br>

    alarm( 0 ); <br>

    signal( SIGALRM, SIG_DFL ); <br>

    /* portmapper本身是一个rpc server，提供远程过程PMAPPROC_DUMP */ <br>

    if ( clnt_call( clientHandle, PMAPPROC_DUMP, ( xdrproc_t )xdr_void, NULL <br>

, <br>

       ( xdrproc_t )xdr_pmaplist, ( caddr_t )&head, minutetimeout ) <br>

       != RPC_SUCCESS ) <br>

    { <br>

        return( 0 ); <br>

    } <br>

    if ( head != NULL ) <br>

    { <br>

        for ( ; head != NULL; head = head->pml_next ) <br>

        { <br>

        { <br>

            if ( head->pml_map.pm_prog == rpcServerNumber ) <br>

            { <br>

                return( 1 ); <br>

            } <br>

        } <br>

    } <br>

    return( 0 ); <br>

}  /* end of rpcServerDump */ <br>

int main ( int argc, char * argv[] ) <br>

{ <br>

    int     i, j, a, b, c, d; <br>

    int     progNumber = PMAPPROG; <br>

    char *  targetIp; <br>

    struct ipoctet  *ipstart, *ipend; <br>

    struct ipocteti  ipstarti, ipendi; <br>

    if ( argc < 4 ) <br>

    { <br>

        fprintf( stderr, "Usage: %s <startIp> <endIp> <rpcServerNumber>\n", <br>

argv <br>

[0] ); <br>

        exit( -1 ); <br>

    } <br>

    } <br>

    /* 简单地检查一下命令行参数是否合法 */ <br>

    if ( ( strlen( argv[1] ) > MAX_IP_LEN ) || ( strlen( argv[2] ) > MAX_IP_ <br>

LEN <br>

) ) <br>

    { <br>

        fprintf( stderr, "Usage: %s <startIp> <endIp> <rpcServerNumber>\n", <br>

argv <br>

[0] ); <br>

        exit( -1 ); <br>

    } <br>

    /* 初始化 */ <br>

    progNumber = atoi( argv[3] ); <br>

    i          = 0; <br>

    j          = 0; <br>

    ipstart    = ( struct ipoctet * )malloc( sizeof( struct ipoctet ) ); <br>

    ipend      = ( struct ipoctet * )malloc( sizeof( struct ipoctet ) ); <br>

    while ( argv[1][i] != '.' ) <br>

    { <br>

        ipstart->a[ j++ ] = argv[1][ i++ ]; <br>

    } <br>

    ipstart->a[j] = '\0'; <br>

    j = 0; <br>

    j = 0; <br>

    i++; <br>

    while ( argv[1][i] != '.' ) <br>

    { <br>

        ipstart->b[ j++ ] = argv[1][ i++ ]; <br>

    } <br>

    ipstart->b[j] = '\0'; <br>

    j = 0; <br>

    i++; <br>

    while ( argv[1][i] != '.' ) <br>

    { <br>

        ipstart->c[ j++ ] = argv[1][ i++ ]; <br>

    } <br>

    ipstart->c[j] = '\0'; <br>

    j = 0; <br>

    i++; <br>

    while ( argv[1][i] != '\0' ) <br>

    { <br>

        ipstart->d[ j++ ] = argv[1][ i++ ]; <br>

    } <br>

    ipstart->d[j] = '\0'; <br>

    i = 0; <br>

    j = 0; <br>

    j = 0; <br>

    while ( argv[2][i] != '.' ) <br>

    { <br>

        ipend->a[ j++ ] = argv[2][ i++ ]; <br>

    } <br>

    ipend->a[j] = '\0'; <br>

    j = 0; <br>

    i++; <br>

    while ( argv[2][i] != '.' ) <br>

    { <br>

        ipend->b[ j++ ] = argv[2][ i++ ]; <br>

    } <br>

    ipend->b[j] = '\0'; <br>

    j = 0; <br>

    i++; <br>

    while ( argv[2][i] != '.' ) <br>

    { <br>

        ipend->c[ j++ ] = argv[2][ i++ ]; <br>

    } <br>

    ipend->c[j] = '\0'; <br>

    j = 0; <br>

    i++; <br>

    while ( argv[2][i] != '\0' ) <br>



    { <br>

        ipend->d[ j++ ] = argv[2][ i++ ]; <br>

    } <br>

    ipend->d[j] = '\0'; <br>

    /* Convert to integer values and store in struct */ <br>

    if ( ipstart->a != NULL ) <br>

    { <br>

        ipstarti.a = atoi( ipstart->a ); <br>

    } <br>

    if ( ipstart->b != NULL ) <br>

    { <br>

        ipstarti.b = atoi( ipstart->b ); <br>

    } <br>

    if ( ipstart->c != NULL ) <br>

    { <br>

        ipstarti.c = atoi( ipstart->c ); <br>

    } <br>

    if ( ipstart->d != NULL ) <br>

    { <br>

        ipstarti.d = atoi( ipstart->d ); <br>

    } <br>

    if ( ipend->a != NULL ) <br>



    { <br>

        ipendi.a = atoi( ipend->a ); <br>

    } <br>

    if ( ipend->b != NULL ) <br>

    { <br>

        ipendi.b = atoi( ipend->b ); <br>

    } <br>

    if ( ipend->c != NULL ) <br>

    { <br>

        ipendi.c = atoi( ipend->c ); <br>

    } <br>

    if ( ipend->d != NULL ) <br>

    { <br>

        ipendi.d = atoi( ipend->d ); <br>

    } <br>

    free( ipend ); <br>

    free( ipstart ); <br>

    fprintf( stderr, "[ Scanning from %d.%d.%d.%d --> %d.%d.%d.%d ]\n", <br>

             ipstarti.a, ipstarti.b, ipstarti.c, ipstarti.d, <br>

             ipendi.a, ipendi.b, ipendi.c, ipendi.d ); <br>

    for ( a = ipstarti.a; a <= ipendi.a; a++ ) <br>

    { <br>

    { <br>

        for ( b = ipstarti.b; b <= ipendi.b; b++ ) <br>

        { <br>

            for ( c = ipstarti.c; c <= ipendi.c; c++ ) <br>

            { <br>

                for ( d = ipstarti.d; d <= ipendi.d; d++ ) <br>

                { <br>

                    targetIp = ( char * )malloc( 17 ); <br>

                    sprintf( targetIp, "%d.%d.%d.%d", a, b, c, d ); <br>

                    fprintf( stderr, "." ); <br>

                    if ( rpcServerDump( targetIp, progNumber ) ) <br>

                    { <br>

                        fprintf( stderr, "\n[ %s found ]\n", targetIp ); <br>

                    } <br>

                    free( targetIp ); <br>

                } <br>

            } <br>

        } <br>

    } <br>

    fprintf( stderr, "\n[ Scan finished ]\n" ); <br>

    return( 0 ); <br>

}  /* end of main */ <br>

[scz@ /home/scz/src/rpc]> gcc -pipe -O3 -o rpcscan rpcscan.c <br>



[scz@ /home/scz/src/rpc]> strip rpcscan <br>

[scz@ /home/scz/src/rpc]> ./rpcscan <br>

Usage: ./rpcscan <startIp> <endIp> <rpcServerNumber> <br>

[scz@ /home/scz/src/rpc]> ./rpcscan 192.168.67.100 192.168.67.110 100000 <br>

[ Scanning from 192.168.67.100 --> 192.168.67.110 ] <br>

........ <br>

[ 192.168.67.107 found ] <br>

. <br>

[ 192.168.67.108 found ] <br>

.. <br>

[ Scan finished ] <br>

[scz@ /home/scz/src/rpc]> <br>

讨论： <br>

    通过向portmapper查询而不是直接向rpc server发起远程过程调用来进行rpc scan <br>

，因 <br>

为 <br>

    你可能并不知道目标rpc server的当前版本号。其次这种扫描技术可以不用考虑rp <br>

c se <br>

rver <br>

    在UDP支持下还是TCP支持下。但是，这种扫描技术非常耗时，针对一个C类网的扫描 <br>

足 <br>

以 <br>

以 <br>

    等到你当祖父。 <br>

    使用远程程序号进行rpc scan比使用rpc server name进行扫描要好些，因为远程程 <br>

序 <br>

号 <br>

    相对比较固定统一，而rpc server name就不那么统一了。 <br>

    远程程序号100068，嘿，就是rpc.cmsd呀，可以用上面提供的这个程序进行广域网 <br>

上的 <br>

    rpc.cmsd搜索，接下来就是http://oliver.efri.hr/~crv/security/bugs/SunOS/r <br>

pccm <br>

sd2.html <br>

    的事情了。虽然很多现成rpc远程攻击程序是针对solaris平台的，需要在Sun工作站 <br>

上 <br>

编 <br>

    译运行，但是如果你足够清醒的话，完全可以修改程序使得从Linux平台上远 <br>

程攻击 <br>

    solaris平台，这是不冲突的。有时间的话，我会给出一个这样的rpc.cmsd攻击程序 <br>

。 <br>

    程序可以修改成另外的方式，比如给出一个rpc server number list，然后扫描。 <br>

  <br>

    下面是以前提过的一个演示用shell script，没有过多技术意义，纯粹是好玩： <br>

    #! /bin/sh <br>

    rm -rf rpcinfo.txt <br>



    /usr/sbin/rpcinfo -p $1 &> rpcinfo.txt <br>

    cat rpcinfo.txt | grep "100002" &> /dev/null <br>

    if [ $? -eq 0 ]; then <br>

    echo "rusersd" <br>

    fi <br>

    cat rpcinfo.txt | grep "100003" &> /dev/null <br>

    if [ $? -eq 0 ]; then <br>

    echo "nfs" <br>

    fi <br>

    rm -rf rpcinfo.txt <br>

    可以修改这个shell script，然后和<< RPC/XDR/NFS系列之----rpcinfo利用 >> <br>

    中的rpcscan相结合，于是就完成了针对一段IP地址扫描一批rpc server的功能。 <br>

    从前面的系列文章中可以看出，RPC不是什么神秘的东西，虽然总有人企图让你畏惧 <br>

它 <br>

， <br>

    让你认为核武器只能掌握在超级大国手中，我只是想吐。这个系列，目的很 <br>

简单，给你 <br>

    一点自信，走上Unix程序员该走的路，师父引入门修行在个人，不要怕。虽然我很 <br>

水， <br>

    可我不希望身后的少年们象我这样水。 <br>

scz < mailto: cloudsky@263.net > <br>

2000.02.23 13:52 (待续) <br>



-- <br>

            我问飘逝的风：来迟了？ <br>

            风感慨：是的，他们已经宣战。 <br>

            我问苏醒的大地：还有希望么？ <br>

            大地揉了揉眼睛：还有，还有无数代的少年。 <br>

            我问长空中的英魂：你们相信？ <br>

            英魂带着笑意离去：相信，希望还在。 <br>

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