From 718a5ba1a1a77374c26b134ded46dab13776d1a1 Mon Sep 17 00:00:00 2001
From: Adrian Holovaty <adrian@holovaty.com>
Date: Fri, 9 Dec 2011 22:10:03 +0000
Subject: [PATCH] Fixed #16845 -- Admin 'Change user' page no longer shows the
 password hash. Thanks, dstufft

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17185 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 django/contrib/auth/forms.py  | 40 +++++++++++++++++++++++++++++++++++
 django/contrib/auth/models.py |  2 +-
 2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/django/contrib/auth/forms.py b/django/contrib/auth/forms.py
index b97c5d7054..6fcf323216 100644
--- a/django/contrib/auth/forms.py
+++ b/django/contrib/auth/forms.py
@@ -1,6 +1,8 @@
 from django import forms
+from django.forms.util import flatatt
 from django.template import loader
 from django.utils.http import int_to_base36
+from django.utils.safestring import mark_safe
 from django.utils.translation import ugettext_lazy as _
 
 from django.contrib.auth.models import User
@@ -9,6 +11,40 @@ from django.contrib.auth import authenticate
 from django.contrib.auth.tokens import default_token_generator
 from django.contrib.sites.models import get_current_site
 
+UNMASKED_DIGITS_TO_SHOW = 6
+
+mask_password = lambda p: "%s%s" % (p[:UNMASKED_DIGITS_TO_SHOW], "*" * max(len(p) - UNMASKED_DIGITS_TO_SHOW, 0))
+
+class ReadOnlyPasswordHashWidget(forms.Widget):
+    def render(self, name, value, attrs):
+        if not value:
+            return "None"
+        final_attrs = self.build_attrs(attrs)
+        parts = value.split("$")
+        if len(parts) != 3:
+            # Legacy passwords didn't specify a hash type and were md5.
+            hash_type = "md5"
+            masked = mask_password(value)
+        else:
+            hash_type = parts[0]
+            masked = mask_password(parts[2])
+        return mark_safe("""<div%(attrs)s>
+                    <strong>%(hash_type_label)s</strong>: %(hash_type)s
+                    <strong>%(masked_label)s</strong>: %(masked)s
+                </div>""" % {
+                    "attrs": flatatt(final_attrs),
+                    "hash_type_label": _("Hash type"),
+                    "hash_type": hash_type,
+                    "masked_label": _("Masked hash"),
+                    "masked": masked,
+                })
+
+class ReadOnlyPasswordHashField(forms.Field):
+    widget = ReadOnlyPasswordHashWidget
+
+    def __init__(self, *args, **kwargs):
+        kwargs.setdefault("required", False)
+        super(ReadOnlyPasswordHashField, self).__init__(*args, **kwargs)
 
 class UserCreationForm(forms.ModelForm):
     """
@@ -51,6 +87,10 @@ class UserChangeForm(forms.ModelForm):
     username = forms.RegexField(label=_("Username"), max_length=30, regex=r'^[\w.@+-]+$',
         help_text = _("Required. 30 characters or fewer. Letters, digits and @/./+/-/_ only."),
         error_messages = {'invalid': _("This value may contain only letters, numbers and @/./+/-/_ characters.")})
+    password = ReadOnlyPasswordHashField(label=_("Password"), help_text=_("We don't store raw passwords, so there's no way to see this user's password, but you can change the password using <a href=\"password/\">this form</a>."))
+
+    def clean_password(self):
+        return self.initial["password"]
 
     class Meta:
         model = User
diff --git a/django/contrib/auth/models.py b/django/contrib/auth/models.py
index c82ba12b8a..8ac94c1e8a 100644
--- a/django/contrib/auth/models.py
+++ b/django/contrib/auth/models.py
@@ -177,7 +177,7 @@ class User(models.Model):
     first_name = models.CharField(_('first name'), max_length=30, blank=True)
     last_name = models.CharField(_('last name'), max_length=30, blank=True)
     email = models.EmailField(_('e-mail address'), blank=True)
-    password = models.CharField(_('password'), max_length=128, help_text=_("Use '[algo]$[salt]$[hexdigest]' or use the <a href=\"password/\">change password form</a>."))
+    password = models.CharField(_('password'), max_length=128)
     is_staff = models.BooleanField(_('staff status'), default=False, help_text=_("Designates whether the user can log into this admin site."))
     is_active = models.BooleanField(_('active'), default=True, help_text=_("Designates whether this user should be treated as active. Unselect this instead of deleting accounts."))
     is_superuser = models.BooleanField(_('superuser status'), default=False, help_text=_("Designates that this user has all permissions without explicitly assigning them."))