boto.exception.S3ResponseError: S3ResponseError: 4

Question

I'm trying to get django to upload static files to S3, but istead I'm getting a 403 forbidden error, and I'm not sure why.

Full Stacktrace:

Traceback (most recent call last):
  File "manage.py", line 14, in <module>
    execute_manager(settings)
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 438, in execute_manager
    utility.execute()
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 379, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/django/core/management/base.py", line 191, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/django/core/management/base.py", line 220, in execute
    output = self.handle(*args, **options)
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/django/core/management/base.py", line 351, in handle
    return self.handle_noargs(**options)
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 89, in handle_noargs
    self.copy_file(path, prefixed_path, storage, **options)
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 184, in copy_file
    if not self.delete_file(path, prefixed_path, source_storage, **options):
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 115, in delete_file
    if self.storage.exists(prefixed_path):
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/storages/backends/s3boto.py", line 209, in exists
    return k.exists()
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/boto/s3/key.py", line 391, in exists
    return bool(self.bucket.lookup(self.name))
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/boto/s3/bucket.py", line 143, in lookup
    return self.get_key(key_name, headers=headers)
  File "/home/levi/Projects/DoneBox/.virtualenv/local/lib/python2.7/site-packages/boto/s3/bucket.py", line 208, in get_key
    response.status, response.reason, '')
boto.exception.S3ResponseError: S3ResponseError: 403 Forbidden

Contents of settings.py:

import os
DIRNAME = os.path.dirname(__file__)
# Django settings for DoneBox project.

DEBUG = True
TEMPLATE_DEBUG = DEBUG

ADMINS = (
    # ('Your Name', '[e-mail]'),
)

MANAGERS = ADMINS

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3', # Add 'postgresql_psycopg2', 'postgresql', 'mysql', 'sqlite3' or 'oracle'.
        'NAME': os.path.join(DIRNAME, "box.sqlite"),                      # Or path to database file if using sqlite3.
        'USER': '',                      # Not used with sqlite3.
        'PASSWORD': '',                  # Not used with sqlite3.
        'HOST': '',                      # Set to empty string for localhost. Not used with sqlite3.
        'PORT': '',                      # Set to empty string for default. Not used with sqlite3.
    }
}

# Local time zone for this installation. Choices can be found here:
# http://en.wikipedia.org/wiki/List_of_tz_zones_by_name
# although not all choices may be available on all operating systems.
# On Unix systems, a value of None will cause Django to use the same
# timezone as the operating system.
# If running in a Windows environment this must be set to the same as your
# system time zone.
TIME_ZONE = 'America/Denver'

# Language code for this installation. All choices can be found here:
# http://www.i18nguy.com/unicode/language-identifiers.html
LANGUAGE_CODE = 'en-us'

SITE_ID = 1

# If you set this to False, Django will make some optimizations so as not
# to load the internationalization machinery.
USE_I18N = True

# If you set this to False, Django will not format dates, numbers and
# calendars according to the current locale
USE_L10N = True

# Absolute filesystem path to the directory that will hold user-uploaded files.
# Example: "/home/media/media.lawrence.com/media/"
MEDIA_ROOT = ''

# URL that handles the media served from MEDIA_ROOT. Make sure to use a
# trailing slash.
# Examples: "http://media.lawrence.com/media/", "http://example.com/media/"
MEDIA_URL = "d1eyn4cjl5vzx0.cloudfront.net"

# Absolute path to the directory static files should be collected to.
# Don't put anything in this directory yourself; store your static files
# in apps' "static/" subdirectories and in STATICFILES_DIRS.
# Example: "/home/media/media.lawrence.com/static/"
STATIC_ROOT = os.path.join(DIRNAME, "static")

# URL prefix for static files.
# Example: "http://media.lawrence.com/static/"
STATIC_URL = "d280kzug7l5rug.cloudfront.net"

# URL prefix for admin static files -- CSS, JavaScript and images.
# Make sure to use a trailing slash.
# Examples: "http://foo.com/static/admin/", "/static/admin/".
ADMIN_MEDIA_PREFIX = '/static/admin/'

# Additional locations of static files
STATICFILES_DIRS = (
    # Put strings here, like "/home/html/static" or "C:/www/django/static".
    # Always use forward slashes, even on Windows.
    # Don't forget to use absolute paths, not relative paths.
    os.path.join(DIRNAME, "main", "static"),
)

# List of finder classes that know how to find static files in
# various locations.
STATICFILES_FINDERS = (
    'django.contrib.staticfiles.finders.FileSystemFinder',
    'django.contrib.staticfiles.finders.AppDirectoriesFinder',
    'django.contrib.staticfiles.finders.DefaultStorageFinder',
)

# Make this unique, and don't share it with anybody.
SECRET_KEY = '<snip>'

# List of callables that know how to import templates from various sources.
TEMPLATE_LOADERS = (
    'django.template.loaders.filesystem.Loader',
    'django.template.loaders.app_directories.Loader',
    'django.template.loaders.eggs.Loader',
)

MIDDLEWARE_CLASSES = (
    'django.middleware.common.CommonMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
)

ROOT_URLCONF = 'DoneBox.urls'

TEMPLATE_DIRS = (
    # Put strings here, like "/home/html/django_templates" or "C:/www/django/templates".
    # Always use forward slashes, even on Windows.
    # Don't forget to use absolute paths, not relative paths.
    os.path.join(DIRNAME, "main", "templates"),
    os.path.join(DIRNAME, "templates"),
    os.path.join(DIRNAME, "basic", "blog", "templates"),
)

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django.contrib.sitemaps',
    # Uncomment the next line to enable the admin:
    'django.contrib.admin',
    # Uncomment the next line to enable admin documentation:
    'storages',
    'django.contrib.admindocs',
    'main',
    'contacts',
    'piston',
    'registration',
#    'contact_form',
    'basic',
    'basic.blog',
)

# A sample logging configuration. The only tangible logging
# performed by this configuration is to send an email to
# the site admins on every HTTP 500 error.
# See http://docs.djangoproject.com/en/dev/topics/logging for
# more details on how to customize your logging configuration.
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'mail_admins': {
            'level': 'ERROR',
            'class': 'django.utils.log.AdminEmailHandler'
        }
    },
    'loggers': {
        'django.request': {
            'handlers': ['mail_admins'],
            'level': 'DEBUG',
            'propagate': True,
        },
        'django.db.backends': {
            'handlers': ['mail_admins'],
            'level': 'DEBUG',
            'propagate': True,
        }
    }
}

DEFAULT_FILE_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
AWS_ACCESS_KEY_ID = '<snip>'
AWS_SECRET_ACCESS_KEY = '<snip>'
STATICFILES_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
AWS_STORAGE_BUCKET_NAME = "donebox-static"
STATIC_FILES_BUCKET = "donebox-static"
MEDIA_FILES_BUCKET = "donebox-media"
ACCOUNT_ACTIVATION_DAYS = 7

EMAIL_HOST = "email-smtp.us-east-1.amazonaws.com"
EMAIL_HOST_USER = '<snip>'
EMAIL_HOST_PASSWORD = '<snip>'
EMAIL_PORT = 587
EMAIL_USE_TLS = True
TEMPLATE_CONTEXT_PROCESSORS = (
    "django.contrib.auth.context_processors.auth",
     "django.core.context_processors.debug",
     "django.core.context_processors.i18n",
     "django.core.context_processors.media",
     "django.core.context_processors.static",
     "django.contrib.messages.context_processors.messages",
     "DoneBox.main.context_processors_PandC",
     )

Contents of requirements.pip:

django==1.3
django-storages==1.1.4
django-registration==0.8
django-piston==0.2.3
django-tagging==0.3.1
django-extensions==0.8
BeautifulSoup==3.2.1
boto==2.4.1
mysql-python==1.2.3
tweepy==1.9
feedparser==5.1.2
pycrypto==2.6

A google search for this exception doesn't turn up anything interesting. I suspect I mis-configured things, although I'm not sure. Could someone point me in the right direction? Thank you for your time and consideration.

Answer 1

Maybe you actually don't have access to the bucket you're trying to lookup/get/create..

Remember: bucket names have to be unique across the entire S3 eco-system, so if you try to access (lookup/get/create) a bucket named 'test' you will have no access to it.

Answer 2

Another solution avoiding custom policies and using AWS predefined policies:

• Add S3 full access permissions to your S3 user.

  • IAM / Users / Permissions and Attach Policy
  • Add policy "AmazonS3FullAccess"

Answer 3

Here is a refinement with minimal permissions. In all cases, as discussed elsewhere s3:ListAllMyBuckets is necessary on all buckets.

In it's default configuration django-storages will upload files to S3 with public-read permissions - see django-storages Amazon S3 backend

Trial and error revealed that in this default configuration the only two permissions required are s3:PutObject to upload a file in the first place and s3:PutObjectAcl to set the permissions for that object to public.

No additional actions are required because from that point forward read is public on the object anyway.

IAM User Policy - public-read (default):

{
   "Version": "2012-10-17",
   "Statement": [
       {
           "Effect": "Allow",
           "Action": "s3:ListAllMyBuckets",
           "Resource": "arn:aws:s3:::*"
       },
       {
           "Effect": "Allow",
           "Action": [
               "s3:PutObject",
               "s3:PutObjectAcl"
           ],
           "Resource": "arn:aws:s3:::bucketname/*"
       }
   ]
}

It is not always desirable to have objects publicly readable. This is achieved by setting the relevant property in the settings file.

Django settings.py:

...
AWS_DEFAULT_ACL = "private"
...

And then the s3:PutObjectAcl is no longer required and the minimal permissions are as follows:

IAM User Policy - private:

{
   "Version": "2012-10-17",
   "Statement": [
       {
           "Effect": "Allow",
           "Action": "s3:ListAllMyBuckets",
           "Resource": "arn:aws:s3:::*"
       },
       {
           "Effect": "Allow",
           "Action": [
               "s3:PutObject",
               "s3:GetObject"
           ],
           "Resource": "arn:aws:s3:::bucketname/*"
       }
   ]
}