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cdci:labs:4 [2020/03/17 10:59] mihai.chiroiu [05. [20p] Raw packets altering] |
cdci:labs:4 [2021/03/26 18:29] (current) mihai.chiroiu |
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| ====== Lab04. Man-in-the-middle attack ====== | ====== Lab04. Man-in-the-middle attack ====== | ||
| + | |||
| + | <note warning> | ||
| + | Important read to be graded! | ||
| + | {{page>:cdci:rec&nofooter&noeditbutton&noheader}} | ||
| + | </note> | ||
| ===== Objectives ===== | ===== Objectives ===== | ||
| Line 16: | Line 21: | ||
| First, make sure that your virtual machine is updated (run the provided update.sh script, or create one). | First, make sure that your virtual machine is updated (run the provided update.sh script, or create one). | ||
| - | <code> | ||
| - | root@cdci:/# cat update.sh | ||
| - | #!/bin/bash | ||
| - | # (c) Mihai Chiroiu - CDCI | ||
| - | |||
| - | git clone -b labs --single-branch https://github.com/mihai-chiroiu/cdci.git | ||
| - | git config user.email "student@upb.ro" | ||
| - | </code> | ||
| Next, in one terminal start the provided Mininet topology. | Next, in one terminal start the provided Mininet topology. | ||
| Line 99: | Line 96: | ||
| <code> | <code> | ||
| cat icmp.filter | cat icmp.filter | ||
| - | if (ip.proto == ICMP && icmp.type == 0) { | + | if (ip.proto == ICMP) { |
| - | msg("Changing address!\n"); | + | msg("Changing ICMP type!\n"); |
| - | icmp.type = 8; | + | replace("8.8.8.8", "8.8.4.4"); |
| } | } | ||
| + | etterfilter icmp.filter -o icmp.ef | ||
| </code> | </code> | ||
| Line 108: | Line 106: | ||
| <code> | <code> | ||
| cat icmp.filter | cat icmp.filter | ||
| - | if (ip.proto == ICMP) { | + | if (ip.proto == ICMP && icmp.type == 0) { |
| - | msg("Changing ICMP type!\n"); | + | msg("Changing address!\n"); |
| - | replace("8.8.8.8", "8.8.4.4"); | + | icmp.type = 8; |
| } | } | ||
| etterfilter icmp.filter -o icmp.ef | etterfilter icmp.filter -o icmp.ef | ||
