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Code Issues Releases Wiki Activity

Implement --remove-restrictions (fixes #833)

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This commit is contained in:
Jay Berkenbilt 2023-01-28 13:41:58 -05:00
parent fe11f13d63
commit 1308c45090
8 changed files with 2369 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2023-01-28 Jay Berkenbilt <ejb@ql.org>
* New option --remove-restrictions removes security restrictions
from digitally signed files. Fixes #833.
2023-01-09 Jay Berkenbilt <ejb@ql.org>
* Bug fix: flatten annotations should handle a page with no

4
include/qpdf/QPDF.hh
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@ -685,6 +685,10 @@ class QPDF
// this file
QPDF_DLL
std::string getEncryptionKey() const;
// Remove security restrictions associated with digitally signed
// files.
QPDF_DLL
void removeSecurityRestrictions();
// Linearization support

11
libqpdf/QPDF.cc
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@ -2777,3 +2777,14 @@ QPDF::everPushedInheritedAttributesToPages() const
{
return this->m->ever_pushed_inherited_attributes_to_pages;
}
void
QPDF::removeSecurityRestrictions()
{
auto root = getRoot();
root.removeKey("/Perms");
auto acroform = root.getKey("/AcroForm");
if (acroform.isDictionary() && acroform.hasKey("/SigFlags")) {
acroform.replaceKey("/SigFlags", QPDFObjectHandle::newInteger(0));
}
}

3
libqpdf/QPDFJob.cc
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@ -2333,6 +2333,9 @@ QPDFJob::handleTransformations(QPDF& pdf)
afdh = std::make_shared<QPDFAcroFormDocumentHelper>(pdf);
}
};
if (m->remove_restrictions) {
pdf.removeSecurityRestrictions();
}
if (m->externalize_inline_images ||
(m->optimize_images && (!m->keep_inline_images))) {
for (auto& ph: dh.getAllPages()) {

11
manual/release-notes.rst
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@ -8,6 +8,17 @@ For a detailed list of changes, please see the file
.. x.y.z: not yet released
11.3.0: not yet released
- CLI Enhancements
- New option :qpdf:ref:`--remove-restrictions` removes security
restrictions from digitally signed files.
- Library enhancements
- New method ``QPDF::removeSecurityRestrictions`` removes security
restrictions from digitally signed files.
11.2.0: November 20, 2022
- Build changes

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qpdf/qtest/qpdf/minimal-signed-restricted.pdf Normal file
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2324
qpdf/qtest/qpdf/minimal-signed-restrictions-removed.pdf Normal file
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11
qpdf/qtest/signature-dictionary.test
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@ -128,5 +128,16 @@ foreach my $i (qw(40 128 256))
$td->EXIT_STATUS => 0});
}
$n_tests += 2;
$td->runtest("remove security restrictions",
{$td->COMMAND =>
"qpdf --qdf --no-original-object-ids --static-id" .
" --remove-restrictions minimal-signed-restricted.pdf a.pdf"},
{$td->STRING => "", $td->EXIT_STATUS => 0},
$td->NORMALIZE_NEWLINES);
$td->runtest("checkout output (remove restrictions)",
{$td->FILE => "a.pdf"},
{$td->FILE => "minimal-signed-restrictions-removed.pdf"});
cleanup();
$td->report($n_tests);