view MoinMoin/action/edit.py @ 5910:7e7e1cbb9d3f

security: fix remote code execution vulnerability in twikidraw/anywikidraw actions We have wikiutil.taintfilename() to make user supplied filenames safe, so that they can't contain any "special" characters like path separators, etc. It is used at many places in moin, but wasn't used here. :|
author Thomas Waldmann <tw AT waldmann-edv DOT de>
date Sat, 29 Dec 2012 15:05:29 +0100
parents 16f3285443ca
children 81b8ea1e9c6f
line wrap: on
line source
# -*- coding: iso-8859-1 -*-
"""
    MoinMoin - edit a page

    This either calls the text or the GUI page editor.

    @copyright: 2000-2004 Juergen Hermann <jh@web.de>,
                2006 MoinMoin:ThomasWaldmann
    @license: GNU GPL, see COPYING for details.
"""
from MoinMoin import wikiutil
from MoinMoin.Page import Page
from MoinMoin.web.utils import check_surge_protect

def execute(pagename, request):
    """ edit a page """
    _ = request.getText

    if 'button_preview' in request.form and 'button_spellcheck' in request.form:
        # multiple buttons pressed at once? must be some spammer/bot
        check_surge_protect(request, kick=True) # get rid of him
        return

    if not request.user.may.write(pagename):
        page = wikiutil.getLocalizedPage(request, 'PermissionDeniedPage')
        page.body = _('You are not allowed to edit this page.')
        page.page_name = pagename
        page.send_page(send_special=True)
        return

    valideditors = ['text', 'gui', ]
    editor = ''
    if request.user.valid:
        editor = request.user.editor_default
    if editor not in valideditors:
        editor = request.cfg.editor_default

    editorparam = request.values.get('editor', editor)
    if editorparam == "guipossible":
        lasteditor = editor
    elif editorparam == "textonly":
        editor = lasteditor = 'text'
    else:
        editor = lasteditor = editorparam

    if request.cfg.editor_force:
        editor = request.cfg.editor_default

    # if it is still nothing valid, we just use the text editor
    if editor not in valideditors:
        editor = 'text'

    rev = request.rev or 0
    savetext = request.form.get('savetext')
    comment = request.form.get('comment', u'')
    category = request.form.get('category')
    rstrip = int(request.form.get('rstrip', '0'))
    trivial = int(request.form.get('trivial', '0'))

    if 'button_switch' in request.form:
        if editor == 'text':
            editor = 'gui'
        else: # 'gui'
            editor = 'text'

    # load right editor class
    if editor == 'gui':
        from MoinMoin.PageGraphicalEditor import PageGraphicalEditor
        pg = PageGraphicalEditor(request, pagename)
    else: # 'text'
        from MoinMoin.PageEditor import PageEditor
        pg = PageEditor(request, pagename)

    # is invoked without savetext start editing
    if savetext is None or 'button_load_draft' in request.form:
        pg.sendEditor()
        return

    # did user hit cancel button?
    cancelled = 'button_cancel' in request.form

    from MoinMoin.error import ConvertError
    try:
        if lasteditor == 'gui':
            # convert input from Graphical editor
            format = request.form.get('format', 'wiki')
            if format == 'wiki':
                converter_name = 'text_html_text_moin_wiki'
            else:
                converter_name = 'undefined' # XXX we don't have other converters yet
            convert = wikiutil.importPlugin(request.cfg, "converter", converter_name, 'convert')
            savetext = convert(request, pagename, savetext)

        # IMPORTANT: normalize text from the form. This should be done in
        # one place before we manipulate the text.
        savetext = pg.normalizeText(savetext, stripspaces=rstrip)
    except ConvertError:
        # we don't want to throw an exception if user cancelled anyway
        if not cancelled:
            raise

    if cancelled:
        pg.sendCancel(savetext or "", rev)
        pagedir = pg.getPagePath(check_create=0)
        import os
        if not os.listdir(pagedir):
            os.removedirs(pagedir)
        return

    comment = wikiutil.clean_input(comment)

    # Add category

    # TODO: this code does not work with extended links, and is doing
    # things behind your back, and in general not needed. Either we have
    # a full interface for categories (add, delete) or just add them by
    # markup.

    if category and category != _('<No addition>'): # opera 8.5 needs this
        # strip trailing whitespace
        savetext = savetext.rstrip()

        # Add category separator if last non-empty line contains
        # non-categories.
        lines = [line for line in savetext.splitlines() if line]
        if lines:

            #TODO: this code is broken, will not work for extended links
            #categories, e.g ["category hebrew"]
            categories = lines[-1].split()

            if categories:
                confirmed = wikiutil.filterCategoryPages(request, categories)
                if len(confirmed) < len(categories):
                    # This was not a categories line, add separator
                    savetext += u'\n----\n'

        # Add new category
        if savetext and savetext[-1] != u'\n':
            savetext += ' '
        savetext += category + u'\n' # Should end with newline!

    if (request.cfg.edit_ticketing and
        not wikiutil.checkTicket(request, request.form.get('ticket', ''))):
        request.theme.add_msg(_('Please use the interactive user interface to use action %(actionname)s!') % {'actionname': 'edit' }, "error")
        pg.sendEditor(preview=savetext, comment=comment, staytop=1)

    # Preview, spellcheck or spellcheck add new words
    elif ('button_preview' in request.form or
        'button_spellcheck' in request.form or
        'button_newwords' in request.form):
        pg.sendEditor(preview=savetext, comment=comment)

    # Preview with mode switch
    elif 'button_switch' in request.form:
        pg.sendEditor(preview=savetext, comment=comment, staytop=1)

    # Save new text
    else:
        try:
            from MoinMoin.security.textcha import TextCha
            if not TextCha(request).check_answer_from_form():
                raise pg.SaveError(_('TextCha: Wrong answer! Try again below...'))
            if request.cfg.comment_required and not comment:
                raise pg.SaveError(_('Supplying a comment is mandatory.  Write a comment below and try again...'))
            savemsg = pg.saveText(savetext, rev, trivial=trivial, comment=comment)
        except pg.EditConflict, e:
            msg = e.message

            # Handle conflict and send editor
            pg.set_raw_body(savetext, modified=1)

            pg.mergeEditConflict(rev)
            # We don't send preview when we do merge conflict
            pg.sendEditor(msg=msg, comment=comment)
            return

        except pg.SaveError, msg:
            # Show the error message
            request.theme.add_msg(unicode(msg), "error")
            # And show the editor again
            pg.sendEditor(preview=savetext, comment=comment, staytop=1)
            return

        # Send new page after successful save
        request.reset()
        pg = Page(request, pagename)

        # sets revision number to default for further actions
        request.rev = 0
        request.theme.add_msg(savemsg, "info")
        pg.send_page()