80 lines
2.1 KiB
Ruby
80 lines
2.1 KiB
Ruby
# Psnuffle password sniffer add-on class for ftp
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# part of psnuffle sniffer auxiliary module
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#
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# When db is available reports go into db
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# Also incorrect credentials are sniffed but marked
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# as unsuccessful logins... (Typos are common :-) )
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#
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class SnifferFTP < BaseProtocolParser
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def register_sigs
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self.sigs = {
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:banner => /^(220\s*[^\r\n]+)/i,
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:user => /^USER\s+([^\s]+)/i,
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:pass => /^PASS\s+([^\s]+)/i,
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:login_pass => /^(230\s*[^\n]+)/i,
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:login_fail => /^(5\d\d\s*[^\n]+)/i,
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}
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end
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def parse(pkt)
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# We want to return immediatly if we do not have a packet which is handled by us
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return if not pkt[:tcp]
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return if (pkt[:tcp].src_port != 21 and pkt[:tcp].dst_port != 21)
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s = find_session((pkt[:tcp].dst_port == 21) ? get_session_src(pkt) : get_session_dst(pkt))
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self.sigs.each_key do |k|
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# There is only one pattern per run to test
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matched = nil
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matches = nil
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if(pkt[:tcp].payload_data =~ self.sigs[k])
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matched = k
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matches = $1
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end
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case matched
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when :login_fail
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if(s[:user] and s[:pass])
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s[:proto]="ftp"
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s[:extra]="Failed Login. Banner: #{s[:banner]}"
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report_auth_info(s)
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print_status("Failed FTP Login: #{s[:session]} >> #{s[:user]} / #{s[:pass]} (#{s[:banner].strip})")
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s[:pass]=""
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return
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end
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when :login_pass
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if(s[:user] and s[:pass])
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s[:proto]="ftp"
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s[:extra]="Successful Login. Banner: #{s[:banner]}"
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report_auth_info(s)
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print_status("Successful FTP Login: #{s[:session]} >> #{s[:user]} / #{s[:pass]} (#{s[:banner].strip})")
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# Remove it form the session objects so freeup memory
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sessions.delete(s[:session])
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return
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end
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when :banner
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# Because some ftp server send multiple banner we take only the first one and ignore the rest
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if not (s[:banner])
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sessions[s[:session]].merge!({k => matches})
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s[:name]="FTP Server Welcome Banner: \"#{s[:banner]}\""
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report_service(s)
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end
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when nil
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# No matches, no saved state
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else
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sessions[s[:session]].merge!({k => matches})
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end # end case matched
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end # end of each_key
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end # end of parse
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end
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