46 lines
1.7 KiB
Plaintext
46 lines
1.7 KiB
Plaintext
# FTP - File Transfer Protocol - RFC 959
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# Pattern attributes: great notsofast fast
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# Protocol groups: document_retrieval ietf_internet_standard
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# Wiki: http://protocolinfo.org/wiki/FTP
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#
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# Usually runs on port 21. Note that the data stream is on a dynamically
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# assigned port, which means that you will need the FTP connection
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# tracking module in your kernel to usefully match FTP data transfers.
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#
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# This pattern is well tested.
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#
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# Handles the first two things a server should say:
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#
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# First, the server says it's ready by sending "220". Most servers say
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# something after 220, even though they don't have to, and it usually
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# includes the string "ftp" (l7-filter is case insensitive). This
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# includes proftpd, vsftpd, wuftpd, warftpd, pureftpd, Bulletproof FTP
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# Server, and whatever ftp.microsoft.com uses. Almost all servers use only
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# ASCII printable characters between the "220" and the "FTP", but non-English
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# ones might use others.
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#
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# The next thing the server sends is a 331. All the above servers also
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# send something including "password" after this code. By default, we
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# do not match on this because it takes another packet and is more work
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# for regexec.
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ftp
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# by default, we allow only ASCII
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^220[\x09-\x0d -~]*ftp
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# This covers UTF-8 as well
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#^220[\x09-\x0d -~\x80-\xfd]*ftp
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# This allows any characters and is about 4x faster than either of the above
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# (which are about the same as each other)
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#^220.*ftp
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# This is much slower
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#^220[\x09-\x0d -~]*ftp|331[\x09-\x0d -~]*password
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# This pattern is more precise, but takes longer to match. (3 packets vs. 1)
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#^220[\x09-\x0d -~]*\x0d\x0aUSER[\x09-\x0d -~]*\x0d\x0a331
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# same as above, but slightly less precise and only takes 2 packets.
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#^220[\x09-\x0d -~]*\x0d\x0aUSER[\x09-\x0d -~]*\x0d\x0a
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