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56b9a79a65
Like traditional file analyzers, we now query Zeek's `get_file_handle()` event for handles when a connection begins analyzing an embedded file. That means that Spicy-side protocol analyzers that are forwarding data into file analysis now need to call Zeek's `Files::register_protocol()` and provide a callback for computing file handles. If that's missing, Zeek will now issue a warning. This aligns with the requirements Zeek's traditional protocol analyzers. (If the EVT file defines a protocol analyzer to `replace` an existing one, that one's `register_protocol()` will be consulted.) Because Zeek's `get_file_handle()` event requires a current connection, if a Spicy file analyzer isn't directly part of a connection context (e.g., with nested files), we continue to use hardcoded, built-in file handle. Scriptland won't be consulted in that case, just like before. Closes #3440.
74 lines
1.7 KiB
Text
74 lines
1.7 KiB
Text
# @TEST-REQUIRES: have-spicy
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#
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# @TEST-EXEC: spicyz -d -o test.hlto ssh.spicy ./ssh-cond.evt
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# @TEST-EXEC: zeek -r ${TRACES}/ssh/single-conn.trace test.hlto %INPUT Spicy::enable_print=T >output 2>&1
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# @TEST-EXEC: btest-diff output
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module SSH;
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global i: count = 0;
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function get_file_handle(c: connection, is_orig: bool): string
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{
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return cat(c$uid, ++i);
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}
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event zeek_init()
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{
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Analyzer::register_for_port(Analyzer::ANALYZER_SPICY_SSH, 22/tcp);
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Files::register_protocol(Analyzer::ANALYZER_SSH, [$get_file_handle=SSH::get_file_handle]); # use tag of replaced analyzer
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}
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# @TEST-START-FILE ssh.spicy
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module SSH;
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import spicy;
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import zeek;
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type Context = tuple<data_chunks: uint64>;
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public type Banner = unit {
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%context = Context;
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magic : /SSH-/;
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version : /[^-]*/;
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dash : /-/;
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software: /[^\r\n]*/;
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};
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public type Data = unit {
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data: bytes &eod;
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on %done { print self.data; }
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};
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on Banner::%done {
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local fid1 = zeek::file_begin("foo/bar");
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local fid2 = zeek::file_begin("foo/bar");
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local fid3 = zeek::file_begin("foo/bar");
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zeek::file_data_in(b"12", fid1);
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zeek::file_data_in(b"!", fid3);
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zeek::file_data_in(b"AAA", fid2);
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zeek::file_data_in(b"@", fid3);
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zeek::file_data_in(b"34", fid1);
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zeek::file_data_in(b"#", fid3);
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zeek::file_data_in(b"56", fid1);
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zeek::file_data_in(b"BBB", fid2);
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zeek::file_data_in(b"$"); # -> fid3
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zeek::file_end(fid1);
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zeek::file_data_in(b"CCC", fid2);
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zeek::file_end(fid2);
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zeek::file_end(fid3);
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}
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# @TEST-END-FILE
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# @TEST-START-FILE ssh-cond.evt
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import zeek;
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protocol analyzer spicy::SSH over TCP:
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parse originator with SSH::Banner,
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replaces SSH;
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file analyzer spicy::Text:
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parse with SSH::Data,
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mime-type foo/bar;
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# @TEST-END-FILE
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