The purpose of this addition is twofold. In trusted mode, iframes are
now unconditionally allowed.
However, many online video providers (YouTube, Vimeo) and other web
applications (Google Maps, Google Calendar, etc) provide embed code in
iframe format, which is useful functionality in untrusted mode.
You can specify iframes as trusted elements with %HTML.SafeIframe;
however, you need to additionally specify a whitelist mechanism such as
%URI.SafeIframeRegexp to say what iframe embeds are OK (by default
everything is rejected).
Note: As iframes are invalid in strict doctypes, you will not be able to
use them there.
We also added an always_load parameter to URIFilters in order to support
the strange nature of the SafeIframe URIFilter (it always needs to be
loaded, due to the inability of accessing the %HTML.SafeIframe directive
to see if it's needed!) We expect this URIFilter can expand in the future
to offer more complex validation mechanisms.
Signed-off-by: Bradley M. Froehle <brad.froehle@gmail.com>
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
Basically, browsers don't parse what should be valid URIs correctly, so
we have to go through some backbends to accomodate them. Specifically,
for browseable URIs, the following URIs have unintended behavior:
- ///example.com
- http:/example.com
- http:///example.com
Furthermore, if the path begins with //, modifying these URLs must
be done with care, as if you remove the host-name component, the
parse tree changes.
I've modified the engine to follow correct URI semantics as much
as possible while outputting browser compatible code, and invalidate
the URI in cases where we can't deal. There has been a refactoring
of URIScheme so that this important check is always performed,
introducing a new member variable allow_empty_host which is true
on data, file, mailto and news schemes.
This also fixes bypass bugs on URI.Munge.
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
The first bug is that we will repeatedly write out the result
of a customized raw definition to the filesystem, even when a cache
entry already exists.
The second bug is that caching these definitions doesn't actually
work (the cache entry is written but never used.) A new API
for retrieving raw definitions permits the user to take advantage
of caching.
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
HTML Purifier loads itself as the first autoload function by
unregistering all existing functions and re-registering them after
registering itself.
Originally an exception was thrown when a non-static object method was
encountered as the behaviour of spl_autoload_functions() did not return
the object instance, but only the class name. This was filed on PHP
bugs (#44144).
The bug was fixed for PHP >= 5.2.11 and >= 5.3
Signed-off-by: Nick Pope <nick@nickpope.me.uk>
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
The new logic is as follows:
* Given a URL to insert into url(), check that it is properly URL
encoded (in particular, a doublequote and backslash never occurs
within it) and then place it as url("http://example.com").
* Given a font name, if it is strictly alphanumeric, it is safe to omit
quotes. Otherwise, wrap in double quotes and replace '"' with '\22 '
(note trailing space) and '\' with '\5C ' (ditto).
We introduce expandCSSEscape() which is a hack for common parsing
idioms in CSS; this means that CSS escapes are now recognized inside
URLs as well as unquoted font names.
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
Previously, my development environment was not running the PEARSax3
tests because my environment was set to E_STRICT error handling, and
thus the tests were skipped. Relax this requirement by making the
wrapper class E_STRICT safe. This introduces a few failing tests.
Also update TODO and add another fresh test.
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
Previously, if two </body> tags were present, HTML Purifier
would truncate everything after the first </body>. This is
not ideal behavior; so HTML Purifier has been changed to
match up to the last </body>.
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
%URI.Munge incorrectly munged URIs that pointed to the
same host as the current website (it did, however, have
the correct behavior for when the munge URL was on the
same server).
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
This fix is slightly hackish, as we simply treat comments as whitespace.
This should largely be correct, and breaks no current test cases,
although it could result in noncompliant behavior.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
This commit is a limited implementation of the "active formatting
elements" algorithm implemented in HTML5, which preserves certain
formatting elements such as <a> and <b> when exiting or entering nodes.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
When precision dictates that a number be zero padded, we cannot give sprintf()
a negative precision specifier. This commit implements manual negative precision
printing of floats, taking into account common rounding errors with floating
point numbers.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
When viewing potentially hostile html, it may be helpful to see what
a given link was pointing to. This new injector takes the href
attribute and adds the text after the link, and deletes the href
attribute.
Other forms of display could easily be contrived, but this seems to be
a good basic way to present the information.
Signed-off-by: David Morton <mortonda@dgrmm.net>
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
Previously, handleEnd was called for any end tag, except ones that were obviously
spurious because there were no parent tags. Now, it is only called for end tags
that are "approved." If an injector operates on the end tag, we automatically
punt. There may be some optimizations that could be made to this procedure,
but for now it's much more consistent.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
Major paradigm shift in this commit is bailing ship on the "skip" integers, which
were extremely buggy and error prone, and simply mark tokens as processed or
not processed by injectors. Other notable changes:
- Removed ad hoc decrements to inputIndex in favor of $reprocess flag variable
- Moved rewind outside of processToken()
- Make rewind properly ignore all other injectors
- Cleanup end of document code
- Reconfigure injector loops to account for skips and rewinds
- Punt the empty to start/end transformation
- Completely rewrite processToken to be array based
- Added skip and rewind member variables to tokens
- Fixed a longstanding bug with remove empty!
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
Previous design of injector streaming involved editability only to start, empty
and text tokens, because they could be safely modified without causing formedness
errors. By modifying notifyEnd to operate before MakeWellFormed's safeguards
kick into effect, it can be converted into a handle function, allowing for
arbitrary modification of end tags.
This change involved quite a bit of restructuring of the MakeWellFormed code,
including the moving of end of document tags to inside the loop, so rewinding
on those tags would be functional, increased reuse of the end tag codepath by
code that inserts end tags (as they could be changed out from under you), and
processToken modified to have an extra parameter to force re-processing of
a token if the original token was an end token.
We're not exactly sure if handleEnd works at this point, but the important
talking point about this refactoring is that nothing else broke. Also, a number
of convenience functions were moved from AutoParagraph to the Injector
supertype (specifically: forward, forwardToEndToken, backward, and current).
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
Also changed:
- DirectLex keeps track of column numbers in context
- New class HTMLPurifier_ErrorStruct
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
AttrValidator's changes are fairly self-explanatory, but ErrorCollector's
changes are worth a little discussion. ErrorCollector can use generators at
various points during its flow control; there are two distinct generators that
it should use: 1. The one used for the output, and 2. The one used for the
error output. These will usually be the same, but in the odd case where they
need to be different, getHTMLFormatted() will accept an alterate configuration
object with an appropriate doctype.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
* Added Charsets and Character attribute types
* Fix a heavily recursive form of ContentSets, this allows a content-set
to include another content-set which includes another content-set, and
so forth.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
This is a very large commit that includes numerous improvements to the
AutoParagraph injector. These are:
* Rewritten flow control of the injector to use almost exclusively
binary conditionals.
* Improved inline documentation with "State" comments, which give concise
examples of what the token stack looks like at flow points.
* Documentation for all flow branches, even those with no actions.
* Factoring out of common operations to improve readability, especially the
new iterator private methods.
* Expanded test-suite which covers new flow points, and corrects some errors
in previous cases.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
The newest autoclose code uses the elements property in whether or not an
element should be closed by a particular tag. The heuristic is simple; if
the element doesn't allow that tag as a child, it closes the parent
container. This doesn't work, however, with <blockquote>, which while not
allowing inline styles under Strict doctypes, requires them to be passed
through MakeWellFormed.
The fix was to transition MakeWellFormed to call a method to retrieve the
elements, and then have StrictBlockquote implement a special version of
this method. Future versions of HTML Purifier may be more flexible in this
regard--further study of the HTML5 specification is required.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
Previously, if an absolute munge URL location was used, HTML passed through
HTML Purifier multiple times would be munged multiple times. This patch
checks if the output URI has the same URI as the input URI; if they do,
the munge is considered unnecessary and discarded.
Requested-by: Chris <justbittin@gmail.com>
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
As part of its duties, URIDefinition determine the base URL and the host URL
of the page based on the two corresponding configuration directives. The
DisableExternal URIFilter, however, bypassed this check by directly checking
%URI.Host. This fix forwards the call through URIDefinition.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
HTMLT tests are a compact and easy-to-use way of making assertPurification
type tests. They take the format of:
--INI--
Ns.Directive = "directive value"
--HTML--
Input HTML
--EXPECT--
Expected HTML
Expect more features and migration to be coming soon.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
By default, the DirectLex and DOMLex behavior with stray angled brackets
varied a great deal due to their implementations. A little known directive
%Core.AggressivelyFixLt attempted to match DOMLex's behavior with DirectLex's,
but it was off by default. By turning it on by default, users now enjoy these
benefits, and performance-minded users can turn it back off.
Also, several refinements to stray angled bracket parsing was made. Specifically:
* DirectLex: Handle each left angled bracket individually, which prevents
strange behavior as reported by eon.
* DOMLex: Iterate aggressive lt fix, so that stacked brackets like << are
handled.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
Previously, attempting to set %Core.Encoding to an encoding iconv didn't
know about would result in a silent failure, with the return of the
boolean false. Now it will fatally error out.
Reported-by: mcgrailm <mgm19@psu.edu>
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
The bugs are:
* Undefined $is_folder variable when path is empty, and
* Improper concatenation of host and path together.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
The MakeWellFormed strategy uses metadata from HTMLDefinition in order to
determine whether or not tokens need to be converted or tags need to be
auto-closed. While this functionality is good to have, it is by no means
essential, and MakeWellFormed should not error when this information is not
available.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
Injector rewind: Injectors can now use the method rewind() in order to move
the input index backwards, so that they can reprocess tokens (other injectors
are not affected by a rewind). This functionality was necessary to implement
nested node removals in %AutoFormat.RemoveEmpty.
End to start ref: To facilitate rewinding, HTMLPurifier_Token_End now
maintains a reference called $start to the starting token for their node.
%AutoFormat.RemoveEmpty removes empty nodes. Lots of people have requested
it, so here is a partially effective implementation. Because it is implemented
as an Injector, it's not possible for it to handle newly introduced empty
nodes by later validators, specifically auto-closing and child validation.
The Injector is only meant to be used on HTML-ish languages.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
Some implementation notes: not all comments are valid; HTML makes sure
double-hyphens and trailing hyphens are not found in comments. In addition,
two new localizable messages were added.
Requested-by: Waldo Jaquith <waldo@vqronline.org>
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
If %Output.SortAttr is true, attributes are sorted to be
in alphabetical order. This was requested by frank farmer.
See also: http://htmlpurifier.org/phorum/read.php?2,1576
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
* Setup usage.xml to be binary, as XMLWriter does not honor operating
system's newline format.
* Setup various files to ignore (svn:ignore was not carried over)
* Add dummy files to prevent git from ignoring empty directories
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
- Add CurrentCSSProperty context variable
- Move Munge to its own class, derived off of SecureMunge.
- Rename %URI.SecureMunge to %URI.Munge
- Rename %URI.SecureMungeSecretKey to %URI.MungeSecretKey
- Add extra substitutions for munge
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1803 48356398-32a2-884e-a903-53898d9a118a
- URIFilter->prepare can return false in order to abort loading of the filter
- Implemented post URI filtering. Set member variable $post to true to set a URIFilter as such.
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1772 48356398-32a2-884e-a903-53898d9a118a
- Convert a number of calls to use new constructor signature for Generator
- Make generator require configuration; this exposes a number of latent bugs
- Removed generator hack
- Convert Printers to use new optimized ConfigSchema format
- Hack with Printer configuration; pass an array(generator config, render config) to distinguish between output and target.
- HTML/CSS Printers need to be primed, otherwise fatal errors
- Convert a few test-cases to use member properties
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1770 48356398-32a2-884e-a903-53898d9a118a
- Improve parseCDATA algorithm to take into account newline normalization
- Fix regression in FontFamily validator. We now have a legit parser in place, albeit somewhat limited in use. Will be superseded by parser for entire grammar
- Convert EncoderTest to new format
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1769 48356398-32a2-884e-a903-53898d9a118a
- Elimination of ConfigDef and subclasses in favor of stdclass. Most property names stay the same
- Added benchmark script for ConfigSchema
- Types are internally handled as magic integers. Use HTMLPurifier_VarParser->getTypeName to convert to human readable form. HTMLPurifier_VarParser still accepts strings.
- Parser in config schema only used for legacy interface
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1764 48356398-32a2-884e-a903-53898d9a118a
- Change API for HTMLPurifier_AttrDef_CSS_Length
- Implement HTMLPurifier_AttrDef_Switch class
- Implement HTMLPurifier_Length->compareTo, and make make() accept object instances
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1754 48356398-32a2-884e-a903-53898d9a118a
- Generator now takes $config and $context during instantiation
- Double quotes outside of attributes are not escaped
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1700 48356398-32a2-884e-a903-53898d9a118a
