diff options
| -rw-r--r-- | TODO | 14 | ||||
| -rw-r--r-- | include/qpdf/QPDFObjectHandle.hh | 7 | ||||
| -rw-r--r-- | libqpdf/QPDFObjectHandle.cc | 23 | ||||
| -rw-r--r-- | libqpdf/QPDF_Stream.cc | 16 | ||||
| -rw-r--r-- | libqpdf/QPDF_encryption.cc | 25 | ||||
| -rw-r--r-- | qpdf/qpdf.testcov | 1 | ||||
| -rw-r--r-- | qpdf/qtest/qpdf.test | 10 | ||||
| -rw-r--r-- | qpdf/qtest/qpdf/decrypted-crypt-filter.pdf | bin | 0 -> 14383 bytes | |||
| -rw-r--r-- | qpdf/qtest/qpdf/metadata-crypt-filter.pdf | 411 |
9 files changed, 483 insertions, 24 deletions
@@ -1,9 +1,6 @@ 2.1 === - * Really need to handle /Crypt filter for Metadata. Search for crypt - below. - * Update documentation to reflect new command line flags and any other relevant changes. Should read through ChangeLog and the manual before releasing 2.1. @@ -83,10 +80,13 @@ General filters. There is an example in the spec of using a crypt filter on a metadata stream. - When we write encrypted files, we must remember to omit any - encryption filter settings from original streams. - - We need a way to test this. + For now, we notice /Crypt filters and decode parameters consistent + with the example in the PDF specification, and the right thing + happens for metadata filters that happen to be uncompressed or + otherwise compressed in a way we can filter. This should handle + all normal cases, but it's more or less just a guess since I don't + have any test files that actually use stream-specific crypt filters + in them. * The second xref stream for linearized files has to be padded only because we need file_size as computed in pass 1 to be accurate. If diff --git a/include/qpdf/QPDFObjectHandle.hh b/include/qpdf/QPDFObjectHandle.hh index 348aef6b..0a277384 100644 --- a/include/qpdf/QPDFObjectHandle.hh +++ b/include/qpdf/QPDFObjectHandle.hh @@ -77,14 +77,14 @@ class DLL_EXPORT QPDFObjectHandle bool isNumber(); double getNumericValue(); - // Methods for name objects + // Methods for name objects; see also name and array objects std::string getName(); // Methods for string objects std::string getStringValue(); std::string getUTF8Value(); - // Methods for array objects + // Methods for array objects; see also name and array objects int getArrayNItems(); QPDFObjectHandle getArrayItem(int n); @@ -93,6 +93,9 @@ class DLL_EXPORT QPDFObjectHandle QPDFObjectHandle getKey(std::string const&); std::set<std::string> getKeys(); + // Methods for name and array objects + bool isOrHasName(std::string const&); + // Mutator methods. Use with caution. // Recursively copy this object, making it direct. Throws an diff --git a/libqpdf/QPDFObjectHandle.cc b/libqpdf/QPDFObjectHandle.cc index 08d648bd..c3a7167b 100644 --- a/libqpdf/QPDFObjectHandle.cc +++ b/libqpdf/QPDFObjectHandle.cc @@ -258,6 +258,29 @@ QPDFObjectHandle::getKeys() return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->getKeys(); } +// Array and Name accessors +bool +QPDFObjectHandle::isOrHasName(std::string const& value) +{ + if (isName() && (getName() == value)) + { + return true; + } + else if (isArray()) + { + int n = getArrayNItems(); + for (int i = 0; i < n; ++i) + { + QPDFObjectHandle item = getArrayItem(0); + if (item.isName() && (item.getName() == value)) + { + return true; + } + } + } + return false; +} + // Dictionary mutators void diff --git a/libqpdf/QPDF_Stream.cc b/libqpdf/QPDF_Stream.cc index a9e2ec51..6642a06e 100644 --- a/libqpdf/QPDF_Stream.cc +++ b/libqpdf/QPDF_Stream.cc @@ -136,6 +136,13 @@ QPDF_Stream::filterable(std::vector<std::string>& filters, filterable = false; } } + else if (((key == "/Type") || (key == "/Name")) && + decode_obj.getKey("/Type").isName() && + (decode_obj.getKey("/Type").getName() == + "/CryptFilterDecodeParms")) + { + // we handle this in decryptStream + } else { filterable = false; @@ -212,7 +219,8 @@ QPDF_Stream::filterable(std::vector<std::string>& filters, iter != filters.end(); ++iter) { std::string const& filter = *iter; - if (! ((filter == "/FlateDecode") || + if (! ((filter == "/Crypt") || + (filter == "/FlateDecode") || (filter == "/LZWDecode") || (filter == "/ASCII85Decode") || (filter == "/ASCIIHexDecode"))) @@ -266,7 +274,11 @@ QPDF_Stream::pipeStreamData(Pipeline* pipeline, bool filter, iter != filters.rend(); ++iter) { std::string const& filter = *iter; - if (filter == "/FlateDecode") + if (filter == "/Crypt") + { + // Ignore -- handled by pipeStreamData + } + else if (filter == "/FlateDecode") { if (predictor == 12) { diff --git a/libqpdf/QPDF_encryption.cc b/libqpdf/QPDF_encryption.cc index fa16f55d..8962624d 100644 --- a/libqpdf/QPDF_encryption.cc +++ b/libqpdf/QPDF_encryption.cc @@ -600,18 +600,19 @@ QPDF::decryptStream(Pipeline*& pipeline, int objid, int generation, encryption_method_e method = e_unknown; std::string method_source = "/StmF from /Encrypt dictionary"; - // NOTE: the section in the PDF specification on crypt filters - // seems to suggest that there might be a /Crypt key in - // /DecodeParms whose value is a crypt filter (.e.g., << /Name - // /StdCF >>), but implementation notes suggest this can only - // happen for metadata streams, and emperical observation - // suggests that they are otherwise ignored. Not having been - // able to find a sample file that uses crypt filters in any - // way other than /StrF and /StmF, I'm not really sure what to - // do about this. If we were to override the encryption on a - // per-stream basis using crypt filters, set method_source to - // something useful in the error message for unknown - // encryption methods (search for method_source). + if (stream_dict.getKey("/Filter").isOrHasName("/Crypt") && + stream_dict.getKey("/DecodeParms").isDictionary()) + { + QPDFObjectHandle decode_parms = stream_dict.getKey("/DecodeParms"); + if (decode_parms.getKey("/Type").isName() && + (decode_parms.getKey("/Type").getName() == + "/CryptFilterDecodeParms")) + { + QTC::TC("qpdf", "QPDF_encryption stream crypt filter"); + method = interpretCF(decode_parms.getKey("/Name")); + method_source = "stream's Crypt decode parameters"; + } + } if (method == e_unknown) { diff --git a/qpdf/qpdf.testcov b/qpdf/qpdf.testcov index dd9ec5b1..6246e8e1 100644 --- a/qpdf/qpdf.testcov +++ b/qpdf/qpdf.testcov @@ -170,3 +170,4 @@ QPDFWriter forcing object stream disable 0 QPDFWriter forced version disabled encryption 0 qpdf-c called qpdf_set_r4_encryption_parameters 0 qpdf-c called qpdf_set_static_aes_IV 0 +QPDF_encryption stream crypt filter 0 diff --git a/qpdf/qtest/qpdf.test b/qpdf/qtest/qpdf.test index f1f2cc53..0c05121b 100644 --- a/qpdf/qtest/qpdf.test +++ b/qpdf/qtest/qpdf.test @@ -1079,7 +1079,7 @@ $td->runtest("make sure there is no xref stream", $td->NORMALIZE_NEWLINES); # Look at some actual V4 files -$n_tests += 8; +$n_tests += 10; foreach my $d (['--force-V4', 'V4'], ['--cleartext-metadata', 'V4-clearmeta'], ['--use-aes=y', 'V4-aes'], @@ -1094,6 +1094,14 @@ foreach my $d (['--force-V4', 'V4'], {$td->FILE => "a.pdf"}, {$td->FILE => "$out.pdf"}); } +# Crypt Filter +$td->runtest("decrypt with crypt filter", + {$td->COMMAND => "qpdf --decrypt --static-id" . + " metadata-crypt-filter.pdf a.pdf"}, + {$td->STRING => "", $td->EXIT_STATUS => 0}); +$td->runtest("check output", + {$td->FILE => 'a.pdf'}, + {$td->FILE => 'decrypted-crypt-filter.pdf'}); show_ntests(); # ---------- diff --git a/qpdf/qtest/qpdf/decrypted-crypt-filter.pdf b/qpdf/qtest/qpdf/decrypted-crypt-filter.pdf Binary files differnew file mode 100644 index 00000000..75e7f788 --- /dev/null +++ b/qpdf/qtest/qpdf/decrypted-crypt-filter.pdf diff --git a/qpdf/qtest/qpdf/metadata-crypt-filter.pdf b/qpdf/qtest/qpdf/metadata-crypt-filter.pdf new file mode 100644 index 00000000..39ed3d81 --- /dev/null +++ b/qpdf/qtest/qpdf/metadata-crypt-filter.pdf @@ -0,0 +1,411 @@ +%PDF-1.5 +% +1 0 obj +<< /Metadata 3 0 R /Outlines 4 0 R /PageLabels << /Nums [ 0 << /P () >> 2 << /S /r /St 1 >> 7 << /P () >> 9 << /S /r /St 6 >> 11 << /P () >> 12 << /S /D /St 2 >> 15 << /S /D /St 6 >> 19 << /P () >> 20 << /S /D /St 12 >> 22 << /S /D /St 16059 >> 23 << /S /r /St 50 >> 29 << /S /r /St 54 >> ] >> /PageMode /UseOutlines /Pages 5 0 R /Type /Catalog >> +endobj +2 0 obj +<< /CreationDate <f8c3152b7dae7ddf2053e239403136310f29cba5913562> /ModDate <f8c3152b7dae7ddf2053e239403136310f29cba5913562> >> +endobj +3 0 obj +<< /Subtype /XML /Type /Metadata /DecodeParms << /Name /Identity /Type /CryptFilterDecodeParms >> /Filter /Crypt /Length 770 >> +stream +<?xpacket begin='' id='W5M0MpCehiHzreSzNTczkc9d' bytes='770'?> + +<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#' + xmlns:iX='http://ns.adobe.com/iX/1.0/'> + + <rdf:Description about='' + xmlns='http://ns.adobe.com/pdf/1.3/' + xmlns:pdf='http://ns.adobe.com/pdf/1.3/'> + <pdf:ModDate>2003-10-10T18:04:32-03:00</pdf:ModDate> + <pdf:CreationDate>2003-10-10T18:04:32-03:00</pdf:CreationDate> + </rdf:Description> + + <rdf:Description about='' + xmlns='http://ns.adobe.com/xap/1.0/' + xmlns:xap='http://ns.adobe.com/xap/1.0/'> + <xap:ModifyDate>2003-10-10T18:04:32-03:00</xap:ModifyDate> + <xap:CreateDate>2003-10-10T18:04:32-03:00</xap:CreateDate> + <xap:MetadataDate>2003-10-10T18:04:32-03:00</xap:MetadataDate> + </rdf:Description> + +</rdf:RDF> +<?xpacket end='r'?>endstream +endobj +4 0 obj +<< /Count 6 /First 6 0 R /Last 7 0 R /Type /Outlines >> +endobj +5 0 obj +<< 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