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from django.conf import settings
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from django.http import HttpResponseForbidden
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from django.template import Context, Engine, TemplateDoesNotExist, loader
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from django.utils.translation import gettext as _
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from django.utils.version import get_docs_version
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# We include the template inline since we need to be able to reliably display
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# this error message, especially for the sake of developers, and there isn't any
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# other way of making it available independent of what is in the settings file.
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# Only the text appearing with DEBUG=False is translated. Normal translation
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# tags cannot be used with this inline templates as makemessages would not be
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# able to discover the strings.
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CSRF_FAILURE_TEMPLATE = """
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<meta name="robots" content="NONE,NOARCHIVE">
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<title>403 Forbidden</title>
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<style type="text/css">
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html * { padding:0; margin:0; }
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body * { padding:10px 20px; }
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body * * { padding:0; }
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body { font:small sans-serif; background:#eee; color:#000; }
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body>div { border-bottom:1px solid #ddd; }
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h1 { font-weight:normal; margin-bottom:.4em; }
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h1 span { font-size:60%; color:#666; font-weight:normal; }
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#info { background:#f6f6f6; }
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#info ul { margin: 0.5em 4em; }
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#info p, #summary p { padding-top:10px; }
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#summary { background: #ffc; }
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#explanation { background:#eee; border-bottom: 0px none; }
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</style>
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</head>
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<body>
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<div id="summary">
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<h1>{{ title }} <span>(403)</span></h1>
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<p>{{ main }}</p>
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{% if no_referer %}
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<p>{{ no_referer1 }}</p>
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<p>{{ no_referer2 }}</p>
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<p>{{ no_referer3 }}</p>
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{% endif %}
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{% if no_cookie %}
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<p>{{ no_cookie1 }}</p>
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<p>{{ no_cookie2 }}</p>
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{% endif %}
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</div>
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{% if DEBUG %}
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<div id="info">
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<h2>Help</h2>
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{% if reason %}
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<p>Reason given for failure:</p>
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<pre>
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{{ reason }}
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</pre>
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{% endif %}
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<p>In general, this can occur when there is a genuine Cross Site Request Forgery, or when
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<a
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href="https://docs.djangoproject.com/en/{{ docs_version }}/ref/csrf/">Django's
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CSRF mechanism</a> has not been used correctly. For POST forms, you need to
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ensure:</p>
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<ul>
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<li>Your browser is accepting cookies.</li>
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<li>The view function passes a <code>request</code> to the template's <a
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href="https://docs.djangoproject.com/en/dev/topics/templates/#django.template.backends.base.Template.render"><code>render</code></a>
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method.</li>
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<li>In the template, there is a <code>{% templatetag openblock %} csrf_token
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{% templatetag closeblock %}</code> template tag inside each POST form that
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targets an internal URL.</li>
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<li>If you are not using <code>CsrfViewMiddleware</code>, then you must use
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<code>csrf_protect</code> on any views that use the <code>csrf_token</code>
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template tag, as well as those that accept the POST data.</li>
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<li>The form has a valid CSRF token. After logging in in another browser
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tab or hitting the back button after a login, you may need to reload the
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page with the form, because the token is rotated after a login.</li>
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</ul>
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<p>You're seeing the help section of this page because you have <code>DEBUG =
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True</code> in your Django settings file. Change that to <code>False</code>,
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and only the initial error message will be displayed. </p>
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<p>You can customize this page using the CSRF_FAILURE_VIEW setting.</p>
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</div>
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{% else %}
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<div id="explanation">
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<p><small>{{ more }}</small></p>
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</div>
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{% endif %}
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</body>
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</html>
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"""
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CSRF_FAILURE_TEMPLATE_NAME = "403_csrf.html"
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def csrf_failure(request, reason="", template_name=CSRF_FAILURE_TEMPLATE_NAME):
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"""
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Default view used when request fails CSRF protection
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"""
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from django.middleware.csrf import REASON_NO_REFERER, REASON_NO_CSRF_COOKIE
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c = {
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'title': _("Forbidden"),
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'main': _("CSRF verification failed. Request aborted."),
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'reason': reason,
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'no_referer': reason == REASON_NO_REFERER,
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'no_referer1': _(
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'You are seeing this message because this HTTPS site requires a '
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'“Referer header” to be sent by your Web browser, but none was '
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'sent. This header is required for security reasons, to ensure '
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'that your browser is not being hijacked by third parties.'),
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'no_referer2': _(
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'If you have configured your browser to disable “Referer” headers, '
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'please re-enable them, at least for this site, or for HTTPS '
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'connections, or for “same-origin” requests.'),
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'no_referer3': _(
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'If you are using the <meta name="referrer" '
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'content=\"no-referrer\"> tag or including the “Referrer-Policy: '
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'no-referrer” header, please remove them. The CSRF protection '
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'requires the “Referer” header to do strict referer checking. If '
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'you’re concerned about privacy, use alternatives like '
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'<a rel=\"noreferrer\" …> for links to third-party sites.'),
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'no_cookie': reason == REASON_NO_CSRF_COOKIE,
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'no_cookie1': _(
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"You are seeing this message because this site requires a CSRF "
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"cookie when submitting forms. This cookie is required for "
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"security reasons, to ensure that your browser is not being "
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"hijacked by third parties."),
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'no_cookie2': _(
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'If you have configured your browser to disable cookies, please '
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're-enable them, at least for this site, or for “same-origin” '
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'requests.'),
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'DEBUG': settings.DEBUG,
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'docs_version': get_docs_version(),
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'more': _("More information is available with DEBUG=True."),
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}
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try:
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t = loader.get_template(template_name)
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except TemplateDoesNotExist:
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if template_name == CSRF_FAILURE_TEMPLATE_NAME:
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# If the default template doesn't exist, use the string template.
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t = Engine().from_string(CSRF_FAILURE_TEMPLATE)
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c = Context(c)
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else:
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# Raise if a developer-specified template doesn't exist.
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raise
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return HttpResponseForbidden(t.render(c), content_type='text/html')
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