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Merge branch 'pajowu/security-plaintext-placeholder' into 'master'

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SECURITY: Prevent placeholder injection in plaintext emails

See merge request pretix/pretix!21
This commit is contained in:
Raphael Michel
2026-02-16 10:59:44 +01:00
parent dd0cd7ab0b ad752dc617
commit 29ed07ccce
7 changed files with 294 additions and 67 deletions
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16
src/pretix/base/email.py
View File

@@ -39,7 +39,7 @@ from pretix.base.templatetags.rich_text import (
DEFAULT_CALLBACKS, EMAIL_RE, URL_RE, abslink_callback,
markdown_compile_email, truelink_callback,
)
from pretix.helpers.format import SafeFormatter, format_map
from pretix.helpers.format import FormattedString, SafeFormatter, format_map
from pretix.base.services.placeholders import ( # noqa
get_available_placeholders, PlaceholderContext
@@ -141,6 +141,7 @@ class TemplateBasedMailRenderer(BaseHTMLMailRenderer):
return markdown_compile_email(plaintext, context=context)
def render(self, plain_body: str, plain_signature: str, subject: str, order, position, context) -> str:
apply_format_map = not isinstance(plain_body, FormattedString)
body_md = self.compile_markdown(plain_body, context)
if context:
linker = bleach.Linker(
@@ -149,12 +150,13 @@ class TemplateBasedMailRenderer(BaseHTMLMailRenderer):
callbacks=DEFAULT_CALLBACKS + [truelink_callback, abslink_callback],
parse_email=True
)
body_md = format_map(
body_md,
context=context,
mode=SafeFormatter.MODE_RICH_TO_HTML,
linkifier=linker
)
if apply_format_map:
body_md = format_map(
body_md,
context=context,
mode=SafeFormatter.MODE_RICH_TO_HTML,
linkifier=linker
)
htmlctx = {
'site': settings.PRETIX_INSTANCE_NAME,
'site_url': settings.SITE_URL,

8
src/pretix/base/models/orders.py
View File

@@ -87,7 +87,7 @@ from pretix.base.timemachine import time_machine_now
from ...helpers import OF_SELF
from ...helpers.countries import CachedCountries, FastCountryField
from ...helpers.format import format_map
from ...helpers.format import FormattedString, format_map
from ...helpers.names import build_name
from ...testutils.middleware import debugflags_var
from ._transactions import (
@@ -1178,7 +1178,8 @@ class Order(LockModel, LoggedModel):
recipient = position.attendee_email
email_content = render_mail(template, context)
subject = format_map(subject, context)
if not isinstance(subject, FormattedString):
subject = format_map(subject, context)
mail(
recipient, subject, template, context,
self.event, self.locale, self, headers=headers, sender=sender,
@@ -2907,7 +2908,8 @@ class OrderPosition(AbstractPosition):
with language(self.order.locale, self.order.event.settings.region):
recipient = self.attendee_email
email_content = render_mail(template, context)
subject = format_map(subject, context)
if not isinstance(subject, FormattedString):
subject = format_map(subject, context)
mail(
recipient, subject, template, context,
self.event, self.order.locale, order=self.order, headers=headers, sender=sender,

69
src/pretix/base/services/mail.py
View File

@@ -81,7 +81,9 @@ from pretix.base.signals import (
)
from pretix.celery_app import app
from pretix.helpers import OF_SELF
from pretix.helpers.format import SafeFormatter, format_map
from pretix.helpers.format import (
FormattedString, PlainHtmlAlternativeString, SafeFormatter, format_map,
)
from pretix.helpers.hierarkey import clean_filename
from pretix.multidomain.urlreverse import build_absolute_uri
from pretix.presale.ical import get_private_icals
@@ -218,6 +220,9 @@ def mail(email: Union[str, Sequence[str]], subject: str, template: Union[str, La
if email == INVALID_ADDRESS:
return
if isinstance(template, FormattedString):
raise TypeError("Cannot pass an already formatted body template")
if no_order_links and not plain_text_only:
raise ValueError('If you set no_order_links, you also need to set plain_text_only.')
@@ -251,23 +256,28 @@ def mail(email: Union[str, Sequence[str]], subject: str, template: Union[str, La
if event and attach_tickets and not event.settings.mail_attach_tickets:
attach_tickets = False
with language(locale):
with language(locale), override(timezone):
if isinstance(context, dict) and order:
_autoextend_context(context, order)
# Build raw content
body_plain = render_mail(template, context, placeholder_mode=SafeFormatter.MODE_RICH_TO_PLAIN)
content_plain = render_mail(template, context, placeholder_mode=None)
if settings_holder:
signature = str(settings_holder.settings.get('mail_text_signature'))
else:
signature = ""
# Build full plain-text body
if not isinstance(content_plain, FormattedString):
body_plain = format_map(content_plain, context, mode=SafeFormatter.MODE_RICH_TO_PLAIN)
else:
body_plain = content_plain
body_plain = _wrap_plain_body(body_plain, signature, event, order, position, no_order_links)
body_plain = format_map(body_plain, context, mode=SafeFormatter.MODE_RICH_TO_PLAIN)
# Build subject
subject = str(subject).format_map(TolerantDict(context))
if not isinstance(subject, FormattedString):
subject = format_map(subject, context)
subject = raw_subject = subject.replace('\n', ' ').replace('\r', '')[:900]
if settings_holder:
subject = prefix_subject(settings_holder, subject)
@@ -286,26 +296,24 @@ def mail(email: Union[str, Sequence[str]], subject: str, template: Union[str, La
else:
renderer = ClassicMailRenderer(None, organizer)
with override(timezone):
content_plain = render_mail(template, context, placeholder_mode=None)
try:
if 'context' in inspect.signature(renderer.render).parameters:
body_html = renderer.render(content_plain, signature, raw_subject, order, position, context)
elif 'position' in inspect.signature(renderer.render).parameters:
# Backwards compatibility
warnings.warn('Email renderer called without context argument because context argument is not '
'supported.',
DeprecationWarning)
body_html = renderer.render(content_plain, signature, raw_subject, order, position)
else:
# Backwards compatibility
warnings.warn('Email renderer called without position argument because position argument is not '
'supported.',
DeprecationWarning)
body_html = renderer.render(content_plain, signature, raw_subject, order)
except:
logger.exception('Could not render HTML body')
body_html = None
try:
if 'context' in inspect.signature(renderer.render).parameters:
body_html = renderer.render(content_plain, signature, raw_subject, order, position, context)
elif 'position' in inspect.signature(renderer.render).parameters:
# Backwards compatibility
warnings.warn('Email renderer called without context argument because context argument is not '
'supported.',
DeprecationWarning)
body_html = renderer.render(content_plain, signature, raw_subject, order, position)
else:
# Backwards compatibility
warnings.warn('Email renderer called without position argument because position argument is not '
'supported.',
DeprecationWarning)
body_html = renderer.render(content_plain, signature, raw_subject, order)
except:
logger.exception('Could not render HTML body')
body_html = None
m = OutgoingMail.objects.create(
organizer=organizer,
@@ -790,7 +798,12 @@ def render_mail(template, context, placeholder_mode: Optional[int]=SafeFormatter
body = format_map(body, context, mode=placeholder_mode)
else:
tpl = get_template(template)
body = tpl.render(context)
context = {
# Known bug, should behave differently for plain and HTML but we'll fix after security release
k: v.html if isinstance(v, PlainHtmlAlternativeString) else v
for k, v in context.items()
}
body = FormattedString(tpl.render(context))
return body
@@ -936,7 +949,7 @@ def _wrap_plain_body(content_plain, signature, event, order, position, no_order_
body_plain += "\r\n\r\n-- \r\n"
if signature:
signature = signature.format(event=event.name if event else '')
signature = format_map(signature, {"event": event.name if event else ''})
body_plain += signature
body_plain += "\r\n\r\n-- \r\n"
@@ -948,7 +961,7 @@ def _wrap_plain_body(content_plain, signature, event, order, position, no_order_
body_plain += _(
"You can view your order details at the following URL:\n{orderurl}."
).replace("\n", "\r\n").format(
event=event.name, orderurl=build_absolute_uri(
orderurl=build_absolute_uri(
order.event, 'presale:event.order.position', kwargs={
'order': order.code,
'secret': position.web_secret,

27
src/pretix/helpers/format.py
View File

@@ -22,6 +22,7 @@
import logging
from string import Formatter
from django.core.exceptions import SuspiciousOperation
from django.utils.html import conditional_escape
logger = logging.getLogger(__name__)
@@ -37,6 +38,17 @@ class PlainHtmlAlternativeString:
return f"PlainHtmlAlternativeString('{self.plain}', '{self.html}')"
class FormattedString(str):
"""
A str subclass that has been specifically marked as "already formatted" for email rendering
purposes to avoid duplicate formatting.
"""
__slots__ = ()
def __str__(self):
return self
class SafeFormatter(Formatter):
"""
Customized version of ``str.format`` that (a) behaves just like ``str.format_map`` and
@@ -77,8 +89,19 @@ class SafeFormatter(Formatter):
# Ignore format_spec
return super().format_field(self._prepare_value(value), '')
def convert_field(self, value, conversion):
# Ignore any conversions
if conversion is None:
return value
else:
return str(value)
def format_map(template, context, raise_on_missing=False, mode=SafeFormatter.MODE_RICH_TO_PLAIN, linkifier=None):
def format_map(template, context, raise_on_missing=False, mode=SafeFormatter.MODE_RICH_TO_PLAIN, linkifier=None) -> FormattedString:
if isinstance(template, FormattedString):
raise SuspiciousOperation("Calling format_map() on an already formatted string is likely unsafe.")
if not isinstance(template, str):
template = str(template)
return SafeFormatter(context, raise_on_missing, mode=mode, linkifier=linkifier).format(template)
return FormattedString(
SafeFormatter(context, raise_on_missing, mode=mode, linkifier=linkifier).format(template)
)