mirror of https://github.com/qpdf/qpdf.git
deal with stream-specific crypt filters
git-svn-id: svn+q:///qpdf/trunk@827 71b93d88-0707-0410-a8cf-f5a4172ac649
This commit is contained in:
Jay Berkenbilt
parent
70ae58c035
commit
734ac1e1d2
14
TODO
14
TODO
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@ -1,9 +1,6 @@
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2.1
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===
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* Really need to handle /Crypt filter for Metadata. Search for crypt
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below.
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* Update documentation to reflect new command line flags and any
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other relevant changes. Should read through ChangeLog and the
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manual before releasing 2.1.
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@ -83,10 +80,13 @@ General
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filters. There is an example in the spec of using a crypt filter
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on a metadata stream.
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When we write encrypted files, we must remember to omit any
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encryption filter settings from original streams.
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We need a way to test this.
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For now, we notice /Crypt filters and decode parameters consistent
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with the example in the PDF specification, and the right thing
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happens for metadata filters that happen to be uncompressed or
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otherwise compressed in a way we can filter. This should handle
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all normal cases, but it's more or less just a guess since I don't
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have any test files that actually use stream-specific crypt filters
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in them.
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* The second xref stream for linearized files has to be padded only
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because we need file_size as computed in pass 1 to be accurate. If
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@ -77,14 +77,14 @@ class DLL_EXPORT QPDFObjectHandle
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bool isNumber();
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double getNumericValue();
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// Methods for name objects
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// Methods for name objects; see also name and array objects
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std::string getName();
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// Methods for string objects
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std::string getStringValue();
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std::string getUTF8Value();
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// Methods for array objects
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// Methods for array objects; see also name and array objects
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int getArrayNItems();
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QPDFObjectHandle getArrayItem(int n);
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@ -93,6 +93,9 @@ class DLL_EXPORT QPDFObjectHandle
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QPDFObjectHandle getKey(std::string const&);
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std::set<std::string> getKeys();
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// Methods for name and array objects
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bool isOrHasName(std::string const&);
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// Mutator methods. Use with caution.
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// Recursively copy this object, making it direct. Throws an
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@ -258,6 +258,29 @@ QPDFObjectHandle::getKeys()
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return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->getKeys();
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}
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// Array and Name accessors
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bool
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QPDFObjectHandle::isOrHasName(std::string const& value)
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{
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if (isName() && (getName() == value))
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{
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return true;
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}
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else if (isArray())
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{
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int n = getArrayNItems();
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for (int i = 0; i < n; ++i)
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{
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QPDFObjectHandle item = getArrayItem(0);
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if (item.isName() && (item.getName() == value))
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{
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return true;
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}
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}
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}
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return false;
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}
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// Dictionary mutators
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void
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@ -136,6 +136,13 @@ QPDF_Stream::filterable(std::vector<std::string>& filters,
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filterable = false;
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}
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}
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else if (((key == "/Type") || (key == "/Name")) &&
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decode_obj.getKey("/Type").isName() &&
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(decode_obj.getKey("/Type").getName() ==
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"/CryptFilterDecodeParms"))
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{
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// we handle this in decryptStream
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}
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else
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{
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filterable = false;
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@ -212,7 +219,8 @@ QPDF_Stream::filterable(std::vector<std::string>& filters,
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iter != filters.end(); ++iter)
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{
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std::string const& filter = *iter;
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if (! ((filter == "/FlateDecode") ||
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if (! ((filter == "/Crypt") ||
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(filter == "/FlateDecode") ||
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(filter == "/LZWDecode") ||
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(filter == "/ASCII85Decode") ||
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(filter == "/ASCIIHexDecode")))
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@ -266,7 +274,11 @@ QPDF_Stream::pipeStreamData(Pipeline* pipeline, bool filter,
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iter != filters.rend(); ++iter)
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{
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std::string const& filter = *iter;
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if (filter == "/FlateDecode")
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if (filter == "/Crypt")
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{
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// Ignore -- handled by pipeStreamData
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}
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else if (filter == "/FlateDecode")
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{
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if (predictor == 12)
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{
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@ -600,18 +600,19 @@ QPDF::decryptStream(Pipeline*& pipeline, int objid, int generation,
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encryption_method_e method = e_unknown;
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std::string method_source = "/StmF from /Encrypt dictionary";
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// NOTE: the section in the PDF specification on crypt filters
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// seems to suggest that there might be a /Crypt key in
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// /DecodeParms whose value is a crypt filter (.e.g., << /Name
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// /StdCF >>), but implementation notes suggest this can only
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// happen for metadata streams, and emperical observation
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// suggests that they are otherwise ignored. Not having been
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// able to find a sample file that uses crypt filters in any
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// way other than /StrF and /StmF, I'm not really sure what to
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// do about this. If we were to override the encryption on a
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// per-stream basis using crypt filters, set method_source to
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// something useful in the error message for unknown
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// encryption methods (search for method_source).
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if (stream_dict.getKey("/Filter").isOrHasName("/Crypt") &&
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stream_dict.getKey("/DecodeParms").isDictionary())
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{
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QPDFObjectHandle decode_parms = stream_dict.getKey("/DecodeParms");
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if (decode_parms.getKey("/Type").isName() &&
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(decode_parms.getKey("/Type").getName() ==
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"/CryptFilterDecodeParms"))
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{
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QTC::TC("qpdf", "QPDF_encryption stream crypt filter");
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method = interpretCF(decode_parms.getKey("/Name"));
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method_source = "stream's Crypt decode parameters";
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}
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}
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if (method == e_unknown)
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{
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@ -170,3 +170,4 @@ QPDFWriter forcing object stream disable 0
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QPDFWriter forced version disabled encryption 0
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qpdf-c called qpdf_set_r4_encryption_parameters 0
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qpdf-c called qpdf_set_static_aes_IV 0
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QPDF_encryption stream crypt filter 0
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@ -1079,7 +1079,7 @@ $td->runtest("make sure there is no xref stream",
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$td->NORMALIZE_NEWLINES);
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# Look at some actual V4 files
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$n_tests += 8;
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$n_tests += 10;
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foreach my $d (['--force-V4', 'V4'],
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['--cleartext-metadata', 'V4-clearmeta'],
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['--use-aes=y', 'V4-aes'],
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@ -1094,6 +1094,14 @@ foreach my $d (['--force-V4', 'V4'],
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{$td->FILE => "a.pdf"},
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{$td->FILE => "$out.pdf"});
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}
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# Crypt Filter
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$td->runtest("decrypt with crypt filter",
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{$td->COMMAND => "qpdf --decrypt --static-id" .
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" metadata-crypt-filter.pdf a.pdf"},
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{$td->STRING => "", $td->EXIT_STATUS => 0});
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$td->runtest("check output",
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{$td->FILE => 'a.pdf'},
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{$td->FILE => 'decrypted-crypt-filter.pdf'});
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show_ntests();
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# ----------
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Binary file not shown.
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@ -0,0 +1,411 @@
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%PDF-1.5
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%¿÷¢þ
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stream
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<pdf:ModDate>2003-10-10T18:04:32-03:00</pdf:ModDate>
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startxref
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13459
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%%EOF
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Loading…
Reference in New Issue