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gsc.py
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#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-3.0-or-later
# Copyright (C) 2020-2021 Intel Corp.
# Anjo Vahldiek-Oberwagner <[email protected]>
# Dmitrii Kuvaiskii <[email protected]>
import argparse
import json
import hashlib
import os
import pathlib
import shutil
import struct
import sys
import tempfile
import docker # pylint: disable=import-error
import jinja2
import tomli # pylint: disable=import-error
import tomli_w # pylint: disable=import-error
import yaml # pylint: disable=import-error
def gsc_image_name(original_image_name):
return f'gsc-{original_image_name}'
def gsc_unsigned_image_name(original_image_name):
return f'gsc-{original_image_name}-unsigned'
def gsc_tmp_build_path(original_image_name):
return pathlib.Path('build') / f'gsc-{original_image_name}'
def get_docker_image(docker_socket, image_name):
try:
docker_image = docker_socket.images.get(image_name)
return docker_image
except (docker.errors.ImageNotFound, docker.errors.APIError):
return None
def build_docker_image(docker_api, build_path, image_name, dockerfile, **kwargs):
build_path = str(build_path) # Docker API doesn't understand PathLib's PosixPath type
stream = docker_api.build(path=build_path, tag=image_name, dockerfile=dockerfile,
decode=True, **kwargs)
for chunk in stream:
if 'stream' in chunk:
for line in chunk['stream'].splitlines():
print(line)
def extract_binary_info_from_image_config(config, env):
entrypoint = config['Entrypoint'] or []
num_starting_entrypoint_items = len(entrypoint)
cmd = config['Cmd'] or []
working_dir = config['WorkingDir'] or ''
# Canonize working dir
if working_dir == '':
working_dir = '/'
elif working_dir[-1] != '/':
working_dir = working_dir + '/'
# Some Docker images only use the optional CMD and have an empty entrypoint;
# GSC has to make it explicit to prepare scripts and Intel SGX signatures
entrypoint.extend(cmd)
if not entrypoint:
print('Could not find the entrypoint binary to the application image.')
sys.exit(1)
# Set binary to first executable in entrypoint and expand to full absolute path (if binary is
# represented as relative path, e.g. `./my_app` or `some_dir/my_app`)
binary = entrypoint[0]
if not binary.startswith('/') and '/' in binary:
binary = working_dir + binary
# Check if we have fixed binary arguments as part of entrypoint
if num_starting_entrypoint_items > 1:
last_bin_arg = num_starting_entrypoint_items
escaped_args = [s.replace('\\', '\\\\').replace('"', '\\"')
for s in entrypoint[1:last_bin_arg]]
binary_arguments = '"' + '" "'.join(escaped_args) + '"'
else:
last_bin_arg = 0
binary_arguments = ''
# Place the remaining optional arguments previously specified as command in the new command.
# Necessary since the first element of the command may be the binary of the resulting image.
cmd = entrypoint[last_bin_arg + 1:] if len(entrypoint) > last_bin_arg + 1 else ''
cmd = [s.replace('\\', '\\\\').replace('"', '\\"') for s in cmd]
env.globals.update({
'binary': binary,
'binary_arguments': binary_arguments,
'binary_basename': os.path.basename(binary),
'cmd': cmd,
'working_dir': working_dir
})
def extract_environment_from_image_config(config):
env_list = config['Env']
base_image_environment = ''
for env_var in env_list:
# TODO: switch to loader.env_src_file = "file:file_with_serialized_envs" if
# the need for multi-line envvars arises
if '\n' in env_var:
# we use TOML's basic single-line strings, can't have newlines
print(f'Skipping environment variable `{env_var.split("=", maxsplit=1)[0]}`: '
'its value contains newlines.')
continue
escaped_env_var = env_var.translate(str.maketrans({'\\': r'\\', '"': r'\"'}))
env_var_name = escaped_env_var.split('=', maxsplit=1)[0]
if env_var_name in ('PATH', 'LD_LIBRARY_PATH'):
# PATH and LD_LIBRARY_PATH are already part of entrypoint.manifest.template.
# Their values are provided in finalize_manifest.py, hence skipping here.
continue
env_var_value = escaped_env_var.split('=', maxsplit=1)[1]
base_image_environment += f'loader.env.{env_var_name} = "{env_var_value}"\n'
return base_image_environment
def extract_build_args(args):
buildargs_dict = {}
for item in args.build_arg:
if '=' in item:
key, value = item.split('=', maxsplit=1)
buildargs_dict[key] = value
else:
# user specified --build-arg with key and without value, let's retrieve value from env
if item in os.environ:
buildargs_dict[item] = os.environ[item]
else:
print(f'Could not set build arg `{item}` from environment.')
sys.exit(1)
return buildargs_dict
def extract_user_from_image_config(config, env):
user = config['User']
if not user:
user = 'root'
env.globals.update({'app_user': user})
def merge_two_dicts(dict1, dict2, path=[]):
for key in dict2:
if key in dict1:
if isinstance(dict1[key], dict) and isinstance(dict2[key], dict):
merge_two_dicts(dict1[key], dict2[key], path + [str(key)])
elif isinstance(dict1[key], list) and isinstance(dict2[key], list):
dict1[key].extend(dict2[key])
elif dict1[key] == dict2[key]:
pass
else:
raise Exception(f'''Duplicate key with different values found: `{".".join(path +
[str(key)])}`''')
else:
dict1[key] = dict2[key]
return dict1
# Command 1: Build unsigned graminized Docker image from original app Docker image.
def gsc_build(args):
original_image_name = args.image # input original-app image name
unsigned_image_name = gsc_unsigned_image_name(args.image) # output unsigned image name
signed_image_name = gsc_image_name(args.image) # final signed image name (to check)
tmp_build_path = gsc_tmp_build_path(args.image) # pathlib obj with build artifacts
docker_socket = docker.from_env()
if get_docker_image(docker_socket, signed_image_name) is not None:
print(f'Final graminized image `{signed_image_name}` already exists.')
sys.exit(0)
original_image = get_docker_image(docker_socket, original_image_name)
if original_image is None:
print(f'Cannot find original application Docker image `{original_image_name}`.')
sys.exit(1)
config = yaml.safe_load(args.config_file)
if 'Image' in config['Gramine']:
gramine_image_name = gsc_image_name(config['Gramine']['Image'])
if get_docker_image(docker_socket, gramine_image_name) is None:
print(f'Cannot find base-Gramine Docker image `{gramine_image_name}`.')
sys.exit(1)
print(f'Building unsigned graminized Docker image `{unsigned_image_name}` from original '
f'application image `{original_image_name}`...')
# initialize Jinja env with configurations extracted from the original Docker image
env = jinja2.Environment()
env.globals.update(config)
env.globals.update(vars(args))
env.globals.update({'app_image': original_image_name})
extract_user_from_image_config(original_image.attrs['Config'], env)
extract_binary_info_from_image_config(original_image.attrs['Config'], env)
os.makedirs(tmp_build_path, exist_ok=True)
distro = env.globals['Distro']
distro, _ = distro.split(':')
env.globals.update({'compile_template': f'{distro}/Dockerfile.compile.template'})
env.loader = jinja2.FileSystemLoader('templates/')
# generate Dockerfile.build from Jinja-style templates/<distro>/Dockerfile.build.template
# using the user-provided config file with info on OS distro, Gramine version and SGX driver
# and other env configurations generated above
build_template = env.get_template(f'{distro}/Dockerfile.build.template')
with open(tmp_build_path / 'Dockerfile.build', 'w') as dockerfile:
dockerfile.write(build_template.render())
# generate apploader.sh from Jinja-style templates/apploader.template
with open(tmp_build_path / 'apploader.sh', 'w') as apploader:
apploader.write(env.get_template(f'{distro}/apploader.template').render())
# generate entrypoint.manifest from three parts:
# - Jinja-style templates/entrypoint.manifest.template
# - base Docker image's environment variables
# - additional, user-provided manifest options
entrypoint_manifest_render = env.get_template(f'{distro}/entrypoint.manifest.template').render()
entrypoint_manifest_dict = tomli.loads(entrypoint_manifest_render)
base_image_environment = extract_environment_from_image_config(original_image.attrs['Config'])
base_image_dict = tomli.loads(base_image_environment)
user_manifest_contents = ''
if not os.path.exists(args.manifest):
raise FileNotFoundError(f'Manifest file {args.manifest} does not exist')
with open(args.manifest, 'r') as user_manifest_file:
user_manifest_contents = user_manifest_file.read()
user_manifest_dict = tomli.loads(user_manifest_contents)
# Support deprecated syntax: replace old-style TOML-dict (`sgx.trusted_files.key = "file:foo"`)
# with new-style TOML-array (`sgx.trusted_files = ["file:foo"]`) in the user manifest
if 'sgx' in user_manifest_dict:
if 'trusted_files' in user_manifest_dict['sgx']:
if isinstance(user_manifest_dict['sgx']['trusted_files'], dict):
tf_list = list(user_manifest_dict['sgx']['trusted_files'].values())
user_manifest_dict['sgx']['trusted_files'] = tf_list
if 'allowed_files' in user_manifest_dict['sgx']:
if isinstance(user_manifest_dict['sgx']['allowed_files'], dict):
af_list = list(user_manifest_dict['sgx']['allowed_files'].values())
user_manifest_dict['sgx']['allowed_files'] = af_list
if 'protected_files' in user_manifest_dict['sgx']:
if isinstance(user_manifest_dict['sgx']['protected_files'], dict):
pf_list = list(user_manifest_dict['sgx']['protected_files'].values())
user_manifest_dict['sgx']['protected_files'] = pf_list
merged_manifest_dict = merge_two_dicts(user_manifest_dict, entrypoint_manifest_dict)
merged_manifest_dict = merge_two_dicts(merged_manifest_dict, base_image_dict)
with open(tmp_build_path / 'entrypoint.manifest', 'wb') as entrypoint_manifest:
tomli_w.dump(merged_manifest_dict, entrypoint_manifest)
# copy helper script to finalize the manifest from within graminized Docker image
shutil.copyfile('finalize_manifest.py', tmp_build_path / 'finalize_manifest.py')
# Intel's SGX PGP RSA-1024 key signing the intel-sgx/sgx_repo repository. Expires 2023-05-24.
# Available at https://download.01.org/intel-sgx/sgx_repo/ubuntu/intel-sgx-deb.key
shutil.copyfile('keys/intel-sgx-deb.key', tmp_build_path / 'intel-sgx-deb.key')
build_docker_image(docker_socket.api, tmp_build_path, unsigned_image_name, 'Dockerfile.build',
rm=args.rm, nocache=args.no_cache, buildargs=extract_build_args(args))
# Check if docker build failed
if get_docker_image(docker_socket, unsigned_image_name) is None:
print(f'Failed to build unsigned graminized Docker image `{unsigned_image_name}`.')
sys.exit(1)
print(f'Successfully built an unsigned graminized Docker image `{unsigned_image_name}` from '
f'original application image `{original_image_name}`.')
# Command 2: Build a "base Gramine" Docker image with the compiled runtime of Gramine.
def gsc_build_gramine(args):
gramine_image_name = gsc_image_name(args.image) # output base-Gramine image name
tmp_build_path = gsc_tmp_build_path(args.image) # pathlib obj with build artifacts
docker_socket = docker.from_env()
config = yaml.safe_load(args.config_file)
if 'Image' in config['Gramine']:
print('`gsc build-gramine` does not allow `Gramine.Image` to be set.')
sys.exit(1)
if get_docker_image(docker_socket, gramine_image_name) is not None:
print(f'Base-Gramine Docker image `{gramine_image_name}` already exists.')
sys.exit(0)
print(f'Building base-Gramine Docker image `{gramine_image_name}`...')
# initialize Jinja env with user-provided configurations
env = jinja2.Environment()
env.globals.update(config)
env.globals.update(vars(args))
os.makedirs(tmp_build_path, exist_ok=True)
distro = env.globals['Distro']
distro, _ = distro.split(':')
env.loader = jinja2.FileSystemLoader('templates/')
# generate Dockerfile.compile from Jinja-style templates/<distro>/Dockerfile.compile.template
# using the user-provided config file with info on OS distro, Gramine version and SGX driver
# and other user-provided args (see argparser::gsc_build_gramine below)
compile_template = env.get_template(f'{distro}/Dockerfile.compile.template')
with open(tmp_build_path / 'Dockerfile.compile', 'w') as dockerfile:
dockerfile.write(compile_template.render())
if args.file_only:
print(f'Successfully created Dockerfile.compile for base-Gramine Docker image '
f'`{gramine_image_name}` under `{tmp_build_path}`.')
sys.exit(0)
# Intel's SGX PGP RSA-1024 key signing the intel-sgx/sgx_repo repository. Expires 2023-05-24.
# Available at https://download.01.org/intel-sgx/sgx_repo/ubuntu/intel-sgx-deb.key
shutil.copyfile('keys/intel-sgx-deb.key', tmp_build_path / 'intel-sgx-deb.key')
build_docker_image(docker_socket.api, tmp_build_path, gramine_image_name, 'Dockerfile.compile',
rm=args.rm, nocache=args.no_cache, buildargs=extract_build_args(args))
# Check if docker build failed
if get_docker_image(docker_socket, gramine_image_name) is None:
print(f'Failed to build a base-Gramine Docker image `{gramine_image_name}`.')
sys.exit(1)
print(f'Successfully built a base-Gramine Docker image `{gramine_image_name}`.')
# Command 3: Sign Docker image which was previously built via `gsc build`.
def gsc_sign_image(args):
unsigned_image_name = gsc_unsigned_image_name(args.image) # input image name
signed_image_name = gsc_image_name(args.image) # output image name
tmp_build_path = gsc_tmp_build_path(args.image) # pathlib obj with build artifacts
docker_socket = docker.from_env()
unsigned_image = get_docker_image(docker_socket, unsigned_image_name)
if unsigned_image is None:
print(f'Cannot find unsigned graminized Docker image `{unsigned_image_name}`.\n'
f'You must first build this image via `gsc build` command.')
sys.exit(1)
print(f'Signing graminized Docker image `{unsigned_image_name}` -> `{signed_image_name}`...')
# generate Dockerfile.sign from Jinja-style templates/<distro>/Dockerfile.sign.template
# using the user-provided config file with info on OS distro, Gramine version and SGX driver
env = jinja2.Environment()
env.globals.update(yaml.safe_load(args.config_file))
distro = env.globals['Distro']
distro, _ = distro.split(':')
env.loader = jinja2.FileSystemLoader('templates/')
sign_template = []
build_args = []
os.makedirs(tmp_build_path, exist_ok=True)
# Use default steps if user has not provided a Dockerfile/template for signing
if args.template is None:
# copy user-provided signing key and signing Bash script to our tmp build dir (to copy them
# later inside Docker image)
tmp_build_key_path = tmp_build_path / 'gsc-signer-key.pem'
tmp_build_sign_path = tmp_build_path / 'sign.sh'
shutil.copyfile(os.path.abspath(args.key), tmp_build_key_path)
shutil.copy(os.path.abspath('sign.sh'), tmp_build_sign_path)
sign_template = env.get_template(f'{distro}/Dockerfile.sign.template')
build_args = {"passphrase": args.passphrase}
else:
shutil.copy(args.template, 'templates/Dockerfile.sign.user.template')
sign_template = env.get_template(f'{distro}/Dockerfile.sign.user.template')
with open(tmp_build_path / 'Dockerfile.sign', 'w') as dockerfile:
dockerfile.write(sign_template.render(image=unsigned_image_name))
try:
# `forcerm` parameter forces removal of intermediate Docker images even after unsuccessful
# builds, to not leave the signing key lingering in any Docker containers
build_docker_image(docker_socket.api, tmp_build_path, signed_image_name, 'Dockerfile.sign',
forcerm=True, buildargs=build_args)
finally:
if args.template is None:
os.remove(tmp_build_key_path)
if get_docker_image(docker_socket, signed_image_name) is None:
print(f'Failed to build a signed graminized Docker image `{signed_image_name}`.')
sys.exit(1)
print(f'Successfully built a signed Docker image `{signed_image_name}` from '
f'`{unsigned_image_name}`.')
# Simplified version of read_sigstruct from python/graminelibos/sgx_get_token.py
def read_sigstruct(sig):
# Offsets for fields in SIGSTRUCT (defined by the SGX HW architecture, they never change)
SGX_ARCH_ENCLAVE_CSS_DATE = 20
SGX_ARCH_ENCLAVE_CSS_MODULUS = 128
SGX_ARCH_ENCLAVE_CSS_ENCLAVE_HASH = 960
SGX_ARCH_ENCLAVE_CSS_ISV_PROD_ID = 1024
SGX_ARCH_ENCLAVE_CSS_ISV_SVN = 1026
SGX_ARCH_ENCLAVE_CSS_ATTRIBUTES = 928
SGX_ARCH_ENCLAVE_CSS_MISC_SELECT = 900
# Field format: (offset, type, value)
fields = {
'date': (SGX_ARCH_ENCLAVE_CSS_DATE, '<HBB', 'year', 'month', 'day'),
'modulus': (SGX_ARCH_ENCLAVE_CSS_MODULUS, '384s', 'modulus'),
'enclave_hash': (SGX_ARCH_ENCLAVE_CSS_ENCLAVE_HASH, '32s', 'enclave_hash'),
'isv_prod_id': (SGX_ARCH_ENCLAVE_CSS_ISV_PROD_ID, '<H', 'isv_prod_id'),
'isv_svn': (SGX_ARCH_ENCLAVE_CSS_ISV_SVN, '<H', 'isv_svn'),
'attributes': (SGX_ARCH_ENCLAVE_CSS_ATTRIBUTES, '8s8s', 'flags', 'xfrms'),
'misc_select': (SGX_ARCH_ENCLAVE_CSS_MISC_SELECT, '4s', 'misc_select'),
}
attr = {}
for field in fields.values():
values = struct.unpack_from(field[1], sig, field[0])
for i, value in enumerate(values):
attr[field[i + 2]] = value
return attr
# Retrieve information about a previously built graminized Docker image
def gsc_info_image(args):
docker_socket = docker.from_env()
gsc_image = get_docker_image(docker_socket, args.image)
if gsc_image is None:
print(f'Could not find graminized Docker image {args.image}.\n'
'Please make sure to build the graminized image first by using \'gsc build\''
' command.')
sys.exit(1)
# Create temporary directory on the host for sigstruct file
with tempfile.TemporaryDirectory() as tmpdirname:
# Grant owner, group and everyone else read-write-execute permissions on temporary dir, so
# that even non-root users in Docker images can copy `entrypoint.sig` into it
os.chmod(tmpdirname,0o777)
# Copy sigstruct file from Docker container into temporary directory on the host
docker_socket.containers.run(args.image,
'\'cp /gramine/app_files/entrypoint.sig /tmp/host/ 2>/dev/null || :\'',
entrypoint=['sh', '-c'], remove=True,
volumes={tmpdirname: {'bind': '/tmp/host', 'mode': 'rw'}})
sigstruct = {}
with open(os.path.join(tmpdirname, "entrypoint.sig"), 'rb') as sig:
attr = read_sigstruct(sig.read())
# calculate MRSIGNER as sha256 hash over RSA public key's modulus
mrsigner = hashlib.sha256()
mrsigner.update(attr['modulus'])
sigstruct['mr_enclave'] = attr['enclave_hash'].hex()
sigstruct['mr_signer'] = mrsigner.digest().hex()
sigstruct['isv_prod_id'] = attr['isv_prod_id']
sigstruct['isv_svn'] = attr['isv_svn']
sigstruct['date'] = '%d-%02d-%02d' % (attr['year'], attr['month'], attr['day'])
sigstruct['flags'] = attr['flags'].hex()
sigstruct['xfrms'] = attr['xfrms'].hex()
sigstruct['misc_select'] = attr['misc_select'].hex()
# DEBUG attribute of the enclave is very important, so we print it also separately
sigstruct['debug'] = bool(attr['flags'][0] & 0b10)
if not sigstruct:
print(f'Could not extract Intel SGX-related information from image {args.image}.')
sys.exit(1)
print(tomli_w.dumps(sigstruct))
argparser = argparse.ArgumentParser()
subcommands = argparser.add_subparsers(metavar='<command>')
subcommands.required = True
sub_build = subcommands.add_parser('build', help='Build graminized Docker image')
sub_build.set_defaults(command=gsc_build)
sub_build.add_argument('-d', '--debug', action='store_true',
help='Compile Gramine with debug flags and output.')
sub_build.add_argument('-L', '--linux', action='store_true',
help='Compile Gramine with Linux PAL in addition to Linux-SGX PAL.')
sub_build.add_argument('--insecure-args', action='store_true',
help='Allow to specify untrusted arguments during Docker run. '
'Otherwise arguments are ignored.')
sub_build.add_argument('-nc', '--no-cache', action='store_true',
help='Build graminized Docker image without any cached images.')
sub_build.add_argument('--rm', action='store_true',
help='Remove intermediate Docker images when build is successful.')
sub_build.add_argument('--build-arg', action='append', default=[],
help='Set build-time variables (same as "docker build --build-arg").')
sub_build.add_argument('-c', '--config_file', type=argparse.FileType('r', encoding='UTF-8'),
default='config.yaml', help='Specify configuration file.')
sub_build.add_argument('image', help='Name of the application Docker image.')
sub_build.add_argument('manifest', help='Manifest file to use.')
sub_build_gramine = subcommands.add_parser('build-gramine',
help='Build base-Gramine Docker image')
sub_build_gramine.set_defaults(command=gsc_build_gramine)
sub_build_gramine.add_argument('-d', '--debug', action='store_true',
help='Compile Gramine with debug flags and output.')
sub_build_gramine.add_argument('-L', '--linux', action='store_true',
help='Compile Gramine with Linux PAL in addition to Linux-SGX PAL.')
sub_build_gramine.add_argument('-nc', '--no-cache', action='store_true',
help='Build graminized Docker image without any cached images.')
sub_build_gramine.add_argument('--rm', action='store_true',
help='Remove intermediate Docker images when build is successful.')
sub_build_gramine.add_argument('--build-arg', action='append', default=[],
help='Set build-time variables (same as "docker build --build-arg").')
sub_build_gramine.add_argument('-c', '--config_file',
type=argparse.FileType('r', encoding='UTF-8'),
default='config.yaml', help='Specify configuration file.')
sub_build_gramine.add_argument('-f', '--file-only', action='store_true',
help='Stop after Dockerfile is created and do not build the Docker image.')
sub_build_gramine.add_argument('image',
help='Name of the output base-Gramine Docker image.')
sub_sign = subcommands.add_parser('sign-image', help='Sign graminized Docker image')
sub_sign.set_defaults(command=gsc_sign_image)
sub_sign.add_argument('-c', '--config_file', type=argparse.FileType('r', encoding='UTF-8'),
default='config.yaml', help='Specify configuration file.')
sub_sign.add_argument('image', help='Name of the application (base) Docker image.')
sub_sign.add_argument('-k', '--key', help='Key to sign the Intel SGX enclaves inside the Docker image.')
sub_sign.add_argument('-t', '--template',
help='Custom Dockerfile/template to use for signing, say, with a HSM.')
sub_sign.add_argument('-p', '--passphrase', help='Passphrase for the signing key.')
sub_info = subcommands.add_parser('info-image', help='Retrieve information about a graminized '
'Docker image')
sub_info.set_defaults(command=gsc_info_image)
sub_info.add_argument('image', help='Name of the graminized Docker image.')
def main(args):
args = argparser.parse_args()
return args.command(args)