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思科PIX防火墙下抓包方法

作者:易隐者 发布于:2012-2-26 17:42 Sunday 分类:参考资料

命令语法

capture capture_name [type {asp-drop [drop-code] | raw-data | isakmp | webvpn user webvpn-user [url url]}] [access-list access_list_name] [buffer buf_size] [ethernet-type type] [interface interface_name] [packet-length bytes] [circular-buffer][trace trace_count] 

 在版本6.2中首次出现。
 可捕获在ACL中匹配的包。
 可用sniffer软件,如Iris,ethereal,sniffer等打开。
 保存在内存中,缺省512kb,当buffer满的时候会自动停止。

关键步骤:
 在ACL定义感兴趣的数据流。
 将ACL应用到目标接口。

示例

1,先设置感兴趣流量的ACL
access-list cisco_test  permit ip  host 211.91.211.54   host 61.242.223.17
access-list cisco_test  permit ip host 61.242.223.17 host 211.91.211.54
2,抓包
capture in_cap interface inside access-list cisco_test
capture out_cap interface outside access-list cisco_test
3,查看数据包
show capture
show capture in_cap detail
show capture out_cap detail
4,保存数据包
https://61.242.X.X/capture/in_cap/pcap
https://61.242.X.X/capture/out_cap/pcap
注意:确保PIX上启用了http server。

另外的示例

capture pix_dmz_capture_1 access-list tac_capture buffer 10000000 interface dmz

//抓取DMZ接口的数据包,抓包缓存为10000000B,抓包范围为ACL tac_capture,抓包保存的文件名为pix_dmz_capture_1。
capture pix_inside_capture_1 access-list tac_capture buffer 10000000 interface inside

//抓取inside接口的数据包,抓包缓存为10000000B,抓包范围为ACL tac_capture,抓包保存的文件名为pix_inside_capture_1。
no capture pix_dmz_capture_1

//删除抓包文件pix_dmz_capture_1
no capture pix_inside_capture_1

//删除抓包文件pix_inside_capture_1
copy capture:pix_dmz_capture_1 tftp://172.16.1.200/pix_dmz_capture.cap pcap

//将抓包文件pix_dmz_capture_1copy到tftp服务器172.16.1.200上。
copy capture:pix_inside_capture_1 tftp://172.16.1.200/pix_inside_capture.cap pcap

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标签: 防火墙 ACL 抓包 思科 PIX

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Solaris系统下的抓包工具——Snoop

作者:易隐者 发布于:2012-2-16 17:29 Thursday 分类:参考资料

        Snoop 的使用需要root权限。Snoop 是Solaris 系统中自带的工具,是一个用于显示网络通讯的程序,它可捕获IP 包并将其显示或保存到指定文件(限超级用户使用snoop)。

       Snoop 可将捕获的包以一行的形式加以总结或用多行加以详细的描述(有调用不同的参数–v -V来实现). 在总结方式下(-V ) , 将仅显示最高层的相关协议, 例如一个NFS 包将仅显示NFS 信息, 其低层的RPC, UDP, IP, Ethernet 帧信息将不会显示, 但是当加上相应的参数(-v ), 这些信息都能被显示出来。

        参数简介:
[ -a ] # Listen to packets on audio
[ -d device ] # settable to le?, ie?, bf?, tr?
[ -s snaplen ] # Truncate packets
[ -c count ] # Quit after count packets
[ -P ] # Turn OFF promiscuous mode
[ -D ] # Report dropped packets
[ -S ] # Report packet size
[ -i file ] # Read previously captured packets
[ -o file ] # Capture packets in file
[ -n file ] # Load addr-to-name table from file
[ -N ] # Create addr-to-name table
[ -t r|a|d ] # Time: Relative, Absolute or Delta
[ -v ] # Verbose packet display
[ -V ] # Show all summary lines
[ -p first[,last] ] # Select packet(s) to display
[ -x offset[,length] ] # Hex dump from offset for length
[ -C ] # Print packet filter code

       由于snoop 的使用非常灵活, 希望能通过下面一些例子的学习来其常见用法。

1. 监听所有以本机为源和目的的包并将其显示出来.
# snoop
2. 监听所有以主机A为源和目的的包并将其显示出来. ( A为主机名, 下同)
- 2 -
# snoop A
3. 监听所有A和B之间的包并将其保存到文件file.
# snoop -o file A B
4. 显示文件file 中指定的包(99-108)
# snoop - i file -p 99,108
99 0.0027 boutique ->; sunroof NFS C GETATTR FH=8E6C
100 0.0046 sunroof ->; boutique NFS R GETATTR OK
101 0.0080 boutique ->; sunroof NFS C RENAME FH=8E6C MTra00192
to .nfs08
102 0.0102 marmot ->; viper NFS C LOOKUP FH=561E screen.r.13.i386
103 0.0072 viper ->; marmot NFS R LOOKUP No such file or directory
104 0.0085 bugbomb ->; sunroof RLOGIN C PORT=1023 h
105 0.0005 kandinsky ->; sparky RSTAT C Get Statistics
106 0.0004 beeblebrox ->; sunroof NFS C GETATTR FH=0307
107 0.0021 sparky ->; kandinsky RSTAT R
108 0.0073 office ->; jeremiah NFS C READ FH=2584 at 40960 for 8192
5. 详细查看文件file 中第101 个包:
# snoop - i file - v -p101
ETHER: ----- Ether Header -----
ETHER:
ETHER: Packet 101 arrived at 16:09:53.59
ETHER: Packet size = 210 bytes
ETHER: Destination = 8:0:20:1:3d:94, Sun
ETHER: Sou5rce = 8:0:69:1:5f:e, Silicon Graphics
ETHER: Ethertype = 0800 (IP)
ETHER:
IP: ----- IP Header -----
IP:
IP: Version = 4, header length = 20 bytes
IP: Type of service = 00
IP: ..0. .... = routine
IP: ...0 .... = normal delay
IP: .... 0... = normal throughput
IP: .... .0.. = normal reliability
IP: Total length = 196 bytes
IP: Identification 19846
IP: Flags = 0X
IP: .0.. .... = may fragment
IP: ..0. .... = more fragments
?
- 3 -
?
6. 查看主机A和主机B之间的NFS 包(命令中的and 和or 为相应的逻辑运
算)
# snoop - i file rpc nfs and A and B
1 0.0000 A ->; B NFS C GETATTR FH=8E6C
2 0.0046 B ->; A NFS R GETATTR OK
3 0.0080 A ->; B NFS C RENAME FH=8E6C MTra00192 to .nfs08
7. 将这些符合条件的包保存到另一文件file2 中:
# snoop - i file -o file2 rpc nfs A B
8. 监听主机A和主机B间所有TCP 80 端口或UDP80端口的包
# snoop A and B and (tcp or udp) and port 80
9. 监听所有的广播包
# snoop broadcast
Using device /dev/hme (promiscuous mode)
10.10.10.50 ->; BROADCAST UDP D=177 S=2541 LEN=35
10.10.10.50 ->; BROADCAST UDP D=177 S=2541 LEN=35
10.10.10.50 ->; BROADCAST UDP D=177 S=2541 LEN=35
10. 监听所有的多播包, 并显示详细内容.
#snoop –v multicast
ETHER: ----- Ether Header -----
ETHER:
ETHER: Packet 1 arrived at 12:33:2.16
ETHER: Packet size = 69 bytes
ETHER: Destination = ff:ff:ff:ff:ff:ff, (broadcast)
ETHER: Source = 0:4:76:46:8f:50,
ETHER: Ethertype = 0800 (IP)
ETHER:
IP: ----- IP Header -----
IP:
IP: Version = 4
IP: Header length = 20 bytes
IP: Type of service = 0x00
IP: xxx. .... = 0 (precedence)
IP: ...0 .... = normal delay
- 4 -
IP: .... 0... = normal throughput
IP: .... .0.. = normal reliability
IP: Total length = 55 bytes
IP: Identification = 14658
IP: Flags = 0x0
IP: .0.. .... = may fragment
IP: ..0. .... = last fragment
IP: Fragment offset = 0 bytes
IP: Time to live = 128 seconds/hops
IP: Protocol = 17 (UDP)
IP: Header checksum = ed38
IP: Source address = 10.10.10.50, 10.10.10.50
IP: Destination address = 255.255.255.255, BROADCAST
IP: No options
IP:
UDP: ----- UDP Header -----
UDP:
UDP: Source port = 2541
UDP: Destination port = 177
UDP: Length = 35
UDP: Checksum = 8E35
UDP:
ETHER: ----- Ether Header -----
ETHER:
ETHER: Packet 2 arrived at 12:33:12.16
ETHER: Packet size = 69 bytes
ETHER: Destination = ff:ff:ff:ff:ff:ff, (broadcast)
ETHER: Source = 0:4:76:46:8f:50,
ETHER: Ethertype = 0800 (IP)
ETHER:
IP: ----- IP Header -----
IP:
IP: Version = 4
IP: Header length = 20 bytes
IP: Type of service = 0x00
IP: xxx. .... = 0 (precedence)
IP: ...0 .... = normal delay
IP: .... 0... = normal throughput
IP: .... .0.. = normal reliability
IP: Total length = 55 bytes
IP: Identification = 14985
IP: Flags = 0x0
IP: .0.. .... = may fragment
IP: ..0. .... = last fragment
IP: Fragment offset = 0 bytes
IP: Time to live = 128 seconds/hops
IP: Protocol = 17 (UDP)
IP: Header checksum = ebf1
IP: Source address = 10.10.10.50, 10.10.10.50
- 5 -
IP: Destination address = 255.255.255.255, BROADCAST
IP: No options
IP:
UDP: ----- UDP Header -----
UDP:
UDP: Source port = 2541
UDP: Destination port = 177
UDP: Length = 35
UDP: Checksum = 8E35
UDP:
11.监听所有的NTP 协议包
# snoop |grep – i NTP
Using device /dev/hme (promiscuous mode)
ts1 ->; 224.0.1.1 NTP broadcast (Tue Jul 23 12:48:50 2002)
ts1 ->; 224.0.1.1 NTP broadcast (Tue Jul 23 12:49:54 2002)
ts1 ->; 224.0.1.1 NTP broadcast (Tue Jul 23 12:50:58 2002)
ts1 ->; 224.0.1.1 NTP broadcast (Tue Jul 23 12:52:02 2002)
ts1 ->; 224.0.1.1 NTP broadcast (Tue Jul 23 12:53:06 2002)
ts1 ->; 224.0.1.1 NTP broadcast (Tue Jul 23 12:54:10 2002)
这里我们也可看到NTP server 每隔约一分钟即向多播地址广播一次.

Snoop抓包命令使用

格式1:
snoop -x 54 -ta tcp port <smsICP监听的端口> from (sp的ip)
例子 带端口抓包)
snoop -x 54 -ta tcp port 7890 host 221.130.45.142 |tee a.log
例子 不带端口抓包)
snoop -x 54 -ta host 211.94.131.202|tee 2005020900.log
snoop -x 54 -ta tcp port 7890 |tee a.log

================================================================
Solaris内置的IP抓包工具 SNOOP
学习TCP/IP协议的朋友,可以使用Solaris中的snoop,Linux中的tcpdump,Windows中的 EtherReal进行抓包分析。
这里,介绍Solaris中的snoop命令。
登陆Solaris shell环境,使用 snoop -c5 ,看看返回了什么?
--------------------------------------------------------------------------------
Using device /dev/bge0 (promiscuous mode)
           ? -> *            ETHER Type=BEBE (Unknown), size = 80 bytes
           ? -> (multicast) ETHER Type=4009 (Unknown), size = 80 bytes
           ? -> (multicast) ETHER Type=4009 (Unknown), size = 95 bytes
           ? -> *            ETHER Type=BEBE (Unknown), size = 80 bytes
           ? -> *            ETHER Type=BEBE (Unknown), size = 80 bytes
5 packets captured
--------------------------------------------------------------------------------

返回的时5个IP包的信息。
试试 snoop -c1 -x0,可以返回5个IP包的详细码流。
--------------------------------------------------------------------------------
Using device /dev/bge0 (promiscuous mode)
           ? -> *            ETHER Type=BEBE (Unknown), size = 80 bytes
           0: 0003 baa7 070a 0000 baa7 0707 bebe 0100    ................
          16: 01e3 2020 202c 2047 534d 425f 6464 6d5f    ..   , GSMB_ddm_
          32: 315f ffff ffff ffff 0000 bbeb f2cd 0806    1_..............
          48: 0001 0800 0604 0001 0000 bbeb f2cd 0a64    ...............d
          64: 0187 ffff ffff ffff 0a64 01be 0000 0000    .........d......
1 packets captured
--------------------------------------------------------------------------------

试试 snoop -c1 -v,可以返回IP头解析。
--------------------------------------------------------------------------------
Using device /dev/bge0 (promiscuous mode)

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标签: 抓包 snoop Solaris

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合肥网络分析技术团队招募学徒

作者:易隐者 发布于:2012-2-10 22:40 Friday 分类:其 他

合肥网络分析技术团队招募学徒

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