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import logging
import os
import re
from itertools import groupby
from typing import List, Optional, Tuple
from uaclient import api, apt, event_logger, exceptions, messages, system, util
from uaclient.clouds.identity import NoCloudTypeReason, get_cloud_type
from uaclient.entitlements import repo
from uaclient.entitlements.base import EntitlementWithMessage
from uaclient.entitlements.entitlement_status import ApplicationStatus
from uaclient.files import notices
from uaclient.files.notices import Notice
from uaclient.files.state_files import (
ServicesOnceEnabledData,
services_once_enabled_file,
)
from uaclient.types import ( # noqa: F401
MessagingOperations,
MessagingOperationsDict,
StaticAffordance,
)
event = event_logger.get_event_logger()
LOG = logging.getLogger(util.replace_top_level_logger_name(__name__))
CONDITIONAL_PACKAGES_EVERYWHERE = [
"strongswan",
"strongswan-hmac",
"openssh-client",
"openssh-server",
"shim-signed",
]
CONDITIONAL_PACKAGES_OPENSSH_HMAC = [
"openssh-client-hmac",
"openssh-server-hmac",
]
FIPS_CONDITIONAL_PACKAGES = {
"xenial": CONDITIONAL_PACKAGES_EVERYWHERE
+ CONDITIONAL_PACKAGES_OPENSSH_HMAC,
"bionic": CONDITIONAL_PACKAGES_EVERYWHERE
+ CONDITIONAL_PACKAGES_OPENSSH_HMAC,
"focal": CONDITIONAL_PACKAGES_EVERYWHERE,
}
# In containers, we don't install the ubuntu-fips
# metapackage, but we do want to auto-upgrade any
# fips related packages that are already installed.
# These lists need to be kept up to date with the
# Depends of ubuntu-fips.
# Note that these lists only include those packages
# that are relevant for a container to upgrade
# after enabling fips or fips-updates.
UBUNTU_FIPS_METAPACKAGE_DEPENDS_XENIAL = [
"openssl",
"libssl1.0.0",
"libssl1.0.0-hmac",
]
UBUNTU_FIPS_METAPACKAGE_DEPENDS_BIONIC = [
"openssl",
"libssl1.1",
"libssl1.1-hmac",
"libgcrypt20",
"libgcrypt20-hmac",
]
UBUNTU_FIPS_METAPACKAGE_DEPENDS_FOCAL = [
"openssl",
"libssl1.1",
"libssl1.1-hmac",
"libgcrypt20",
"libgcrypt20-hmac",
]
FIPS_CONTAINER_CONDITIONAL_PACKAGES = {
"xenial": CONDITIONAL_PACKAGES_EVERYWHERE
+ CONDITIONAL_PACKAGES_OPENSSH_HMAC
+ UBUNTU_FIPS_METAPACKAGE_DEPENDS_XENIAL,
"bionic": CONDITIONAL_PACKAGES_EVERYWHERE
+ CONDITIONAL_PACKAGES_OPENSSH_HMAC
+ UBUNTU_FIPS_METAPACKAGE_DEPENDS_BIONIC,
"focal": CONDITIONAL_PACKAGES_EVERYWHERE
+ UBUNTU_FIPS_METAPACKAGE_DEPENDS_FOCAL,
}
class FIPSCommonEntitlement(repo.RepoEntitlement):
repo_pin_priority = 1001
repo_key_file = "ubuntu-pro-fips.gpg" # Same for fips & fips-updates
FIPS_PROC_FILE = "/proc/sys/crypto/fips_enabled"
pre_enable_msg = messages.PROMPT_FIPS_PRE_ENABLE
# RELEASE_BLOCKER GH: #104, don't prompt for conf differences in FIPS
# Review this fix to see if we want more general functionality for all
# services. And security/CPC signoff on expected conf behavior.
apt_noninteractive = True
help_doc_url = messages.urls.FIPS_HOME_PAGE
fips_pro_package_holds = [
"fips-initramfs",
"fips-initramfs-generic",
"libgcrypt20",
"libgcrypt20-hmac",
"libgmp10",
"libgnutls30",
"libhogweed6",
"libnettle8",
"libssl1.0.0",
"libssl1.0.0-hmac",
"libssl1.0.0",
"libssl1.0.0-hmac",
"libssl1.1",
"libssl1.1-hmac",
"libssl3",
"linux-fips",
"openssh-client",
"openssh-client-hmac",
"openssh-server",
"openssh-server-hmac",
"openssl",
"openssl-fips-module-3",
"shim-signed",
"strongswan",
"strongswan-hmac",
"ubuntu-fips",
"ubuntu-aws-fips",
"ubuntu-azure-fips",
"ubuntu-gcp-fips",
]
@property
def messaging(self) -> MessagingOperationsDict:
post_enable = None # type: Optional[MessagingOperations]
if system.is_container():
pre_enable_prompt = (
messages.PROMPT_FIPS_CONTAINER_PRE_ENABLE.format(
title=self.title
)
)
if not self.auto_upgrade_all_on_enable():
post_enable = [messages.FIPS_RUN_APT_UPGRADE]
else:
pre_enable_prompt = self.pre_enable_msg
pre_disable = None # type: Optional[MessagingOperations]
if not self.purge:
pre_disable = [
(
util.prompt_for_confirmation,
{
"msg": messages.PROMPT_FIPS_PRE_DISABLE.format(
title=self.title
),
},
)
]
messaging = {
"pre_enable": [
(
util.prompt_for_confirmation,
{"msg": pre_enable_prompt},
)
],
"pre_install": [
(
self.prompt_if_kernel_downgrade,
{},
)
],
"post_enable": post_enable,
"pre_disable": pre_disable,
} # type: MessagingOperationsDict
if len(self.packages) == 1:
# that is the kernel "ubuntu-fips" or "ubuntu-${cloud}-fips"
ubuntu_fips_package_name = self.packages[0]
ubuntu_fips_package_flavor_match = re.match(
"ubuntu-([a-z]+)-fips", ubuntu_fips_package_name
)
if ubuntu_fips_package_flavor_match:
ubuntu_fips_package_flavor = (
ubuntu_fips_package_flavor_match.group(1)
)
else:
ubuntu_fips_package_flavor = "generic"
current_flavor = system.get_kernel_info().flavor
if ubuntu_fips_package_flavor != current_flavor:
pre_enable = messaging.get("pre_enable") or []
msg = messages.KERNEL_FLAVOR_CHANGE_WARNING_PROMPT.format(
variant=ubuntu_fips_package_flavor,
service=self.name,
base_flavor=ubuntu_fips_package_flavor,
current_flavor=current_flavor or "unknown",
)
pre_enable.append(
(
util.prompt_for_confirmation,
{"msg": msg},
)
)
messaging["pre_enable"] = pre_enable
return messaging
@property
def conditional_packages(self):
"""
Dictionary of conditional packages to be installed when
enabling FIPS services. For example, if we are enabling
FIPS services in a machine that has openssh-client installed,
we will perform two actions:
1. Upgrade the package to the FIPS version
2. Install the corresponding hmac version of that package
when available.
"""
series = system.get_release_info().series
if system.is_container():
return FIPS_CONTAINER_CONDITIONAL_PACKAGES.get(series, [])
return FIPS_CONDITIONAL_PACKAGES.get(series, [])
def prompt_if_kernel_downgrade(self, *, assume_yes: bool) -> bool:
"""Check if installing a FIPS kernel will downgrade the kernel
and prompt for confirmation if it will.
"""
# Prior to installing packages, check if the kernel is being downgraded
# and if so verify that the user wants to continue
our_full_kernel_str = (
system.get_kernel_info().proc_version_signature_version
)
if our_full_kernel_str is None:
LOG.warning("Cannot gather kernel information")
return False
our_m = re.search(
r"(?P<kernel_version>\d+\.\d+\.\d+)", our_full_kernel_str
)
fips_kernel_version_str = apt.get_pkg_candidate_version("linux-fips")
if our_m is not None and fips_kernel_version_str is not None:
our_kernel_version_str = our_m.group("kernel_version")
LOG.debug(
"Kernel information: cur='%s' and fips='%s'",
our_full_kernel_str,
fips_kernel_version_str,
)
if (
apt.version_compare(
fips_kernel_version_str, our_kernel_version_str
)
< 0
):
event.info(
messages.KERNEL_DOWNGRADE_WARNING.format(
current_version=our_kernel_version_str,
new_version=fips_kernel_version_str,
)
)
return util.prompt_for_confirmation(
msg=messages.PROMPT_YES_NO, assume_yes=assume_yes
)
else:
LOG.warning(
"Cannot gather kernel information for '%s' and '%s'",
our_full_kernel_str,
fips_kernel_version_str,
)
return True
def hardcoded_install_conditional_packages(
self, progress: api.ProgressWrapper
):
# Any conditional packages should still be installed, but if
# they fail to install we should not block the enable operation.
desired_packages = [] # type: List[str]
installed_packages = apt.get_installed_packages_names()
pkg_groups = groupby(
sorted(self.conditional_packages),
key=lambda pkg_name: pkg_name.replace("-hmac", ""),
)
for pkg_name, pkg_list in pkg_groups:
if pkg_name in installed_packages:
desired_packages += pkg_list
for pkg in desired_packages:
try:
apt.run_apt_install_command(
packages=[pkg],
override_env_vars={"DEBIAN_FRONTEND": "noninteractive"},
apt_options=[
"--allow-downgrades",
'-o Dpkg::Options::="--force-confdef"',
'-o Dpkg::Options::="--force-confold"',
],
)
except exceptions.UbuntuProError:
progress.emit(
"info",
messages.FIPS_PACKAGE_NOT_AVAILABLE.format(
service=self.title, pkg=pkg
),
)
def auto_upgrade_all_on_enable(self) -> bool:
install_all_updates_override = util.is_config_value_true(
config=self.cfg.cfg, path_to_value="features.fips_auto_upgrade_all"
)
# noble onward automatically uses new auto-upgrade logic
hardcoded_release = system.get_release_info().series in {
"xenial",
"bionic",
"focal",
}
return install_all_updates_override or not hardcoded_release
def install_all_available_fips_upgrades(
self, progress: api.ProgressWrapper
):
to_upgrade = [
package.name
for package in apt.get_installed_packages_with_uninstalled_candidate_in_origin( # noqa: E501
self.origin
)
]
to_upgrade.sort()
if len(to_upgrade) > 0:
try:
progress.emit(
"info",
messages.INSTALLING_PACKAGES.format(
packages=" ".join(to_upgrade)
),
)
self.unhold_packages(to_upgrade)
apt.run_apt_install_command(
packages=to_upgrade,
override_env_vars={"DEBIAN_FRONTEND": "noninteractive"},
apt_options=[
"--allow-downgrades",
'-o Dpkg::Options::="--force-confdef"',
'-o Dpkg::Options::="--force-confold"',
],
)
except exceptions.UbuntuProError:
progress.emit("info", messages.FIPS_PACKAGES_UPGRADE_FAILURE)
def install_packages(
self,
progress: api.ProgressWrapper,
package_list: Optional[List[str]] = None,
cleanup_on_failure: bool = True,
) -> None:
"""Install contract recommended packages for the entitlement.
:param package_list: Optional package list to use instead of
self.packages.
:param cleanup_on_failure: Cleanup apt files if apt install fails.
"""
# We need to guarantee that the metapackage is installed.
# While the other packages should still be installed, if they
# fail, we should not block the enable operation.
mandatory_packages = self.packages
if mandatory_packages:
super().install_packages(
progress,
package_list=mandatory_packages,
)
else:
# then this won't get printed by install_packages, so do it here
# instead
progress.progress(
messages.INSTALLING_SERVICE_PACKAGES.format(title=self.title)
)
if self.auto_upgrade_all_on_enable():
self.install_all_available_fips_upgrades(progress)
else:
self.hardcoded_install_conditional_packages(progress)
if self._check_for_reboot():
notices.add(
Notice.FIPS_SYSTEM_REBOOT_REQUIRED,
)
def _check_for_reboot(self) -> bool:
"""Check if system needs to be rebooted because of this service."""
return system.should_reboot()
def _check_for_reboot_msg(
self, operation: str, silent: bool = False
) -> None:
"""Check if user should be alerted that a reboot must be performed.
@param operation: The operation being executed.
@param silent: Boolean set True to silence print/log of messages
"""
reboot_required = self._check_for_reboot()
event.needs_reboot(reboot_required)
if reboot_required:
if not silent:
event.info(
messages.ENABLE_REBOOT_REQUIRED_TMPL.format(
operation=operation
)
)
if operation == "disable operation":
notices.add(
Notice.FIPS_DISABLE_REBOOT_REQUIRED,
)
def _allow_fips_on_cloud_instance(
self, series: str, cloud_id: str
) -> bool:
"""Return False when FIPS is allowed on this cloud and series.
On Xenial GCP there will be no cloud-optimized kernel so
block default ubuntu-fips enable. This can be overridden in
config with features.allow_xenial_fips_on_cloud.
GCP doesn't yet have a cloud-optimized kernel or metapackage so
block enable of fips if the contract does not specify ubuntu-gcp-fips.
This also can be overridden in config with
features.allow_default_fips_metapackage_on_gcp.
:return: False when this cloud, series or config override allows FIPS.
"""
if cloud_id == "gce":
if util.is_config_value_true(
config=self.cfg.cfg,
path_to_value="features.allow_default_fips_metapackage_on_gcp",
):
return True
# GCE only has FIPS support for bionic and focal machines
if series in ("bionic", "focal"):
return True
return bool("ubuntu-gcp-fips" in super().packages)
return True
@property
def static_affordances(self) -> Tuple[StaticAffordance, ...]:
cloud_titles = {"aws": "an AWS", "azure": "an Azure", "gce": "a GCP"}
cloud_id, _ = get_cloud_type()
if cloud_id is None:
cloud_id = ""
series = system.get_release_info().series
blocked_message = messages.FIPS_BLOCK_ON_CLOUD.format(
series=series.title(), cloud=cloud_titles.get(cloud_id)
)
return (
(
blocked_message,
lambda: self._allow_fips_on_cloud_instance(series, cloud_id),
True,
),
)
@property
def packages(self) -> List[str]:
if system.is_container():
return []
return super().packages
def application_status(
self,
) -> Tuple[ApplicationStatus, Optional[messages.NamedMessage]]:
super_status, super_msg = super().application_status()
if system.is_container() and not system.should_reboot():
notices.remove(
Notice.FIPS_SYSTEM_REBOOT_REQUIRED,
)
return super_status, super_msg
if os.path.exists(self.FIPS_PROC_FILE):
# We are now only removing the notice if there is no reboot
# required information regarding the fips metapackage we install.
if not system.should_reboot(set(self.packages)):
notices.remove(
Notice.FIPS_SYSTEM_REBOOT_REQUIRED,
)
if system.load_file(self.FIPS_PROC_FILE).strip() == "1":
notices.remove(
Notice.FIPS_MANUAL_DISABLE_URL,
)
return super_status, super_msg
else:
notices.add(
Notice.FIPS_MANUAL_DISABLE_URL,
)
return (
ApplicationStatus.DISABLED,
messages.FIPS_PROC_FILE_ERROR.format(
file_name=self.FIPS_PROC_FILE
),
)
if super_status != ApplicationStatus.ENABLED:
return super_status, super_msg
return (
ApplicationStatus.ENABLED,
messages.FIPS_REBOOT_REQUIRED,
)
def remove_packages(self) -> None:
"""Remove fips meta package to disable the service.
FIPS meta-package will unset grub config options which will deactivate
FIPS on any related packages.
"""
installed_packages = set(apt.get_installed_packages_names())
fips_metapackage = set(self.packages).difference(
set(self.conditional_packages)
)
remove_packages = fips_metapackage.intersection(installed_packages)
if remove_packages:
apt.remove_packages(
list(fips_metapackage),
messages.DISABLE_FAILED_TMPL.format(title=self.title),
)
def _perform_enable(self, progress: api.ProgressWrapper) -> bool:
if super()._perform_enable(progress):
notices.remove(
Notice.WRONG_FIPS_METAPACKAGE_ON_CLOUD,
)
notices.remove(Notice.FIPS_REBOOT_REQUIRED)
notices.remove(Notice.FIPS_DISABLE_REBOOT_REQUIRED)
return True
return False
def _perform_disable(self, progress: api.ProgressWrapper) -> bool:
if super()._perform_disable(progress):
if self._check_for_reboot():
notices.add(
Notice.FIPS_DISABLE_REBOOT_REQUIRED,
)
return True
return False
def unhold_packages(self, package_names):
cmd = ["apt-mark", "showholds"]
holds = apt.run_apt_command(
cmd,
messages.EXECUTING_COMMAND_FAILED.format(command=" ".join(cmd)),
)
unholds = []
for hold in holds.splitlines():
if hold in package_names:
unholds.append(hold)
if unholds:
unhold_cmd = ["apt-mark", "unhold"] + unholds
holds = apt.run_apt_command(
unhold_cmd,
messages.EXECUTING_COMMAND_FAILED.format(
command=" ".join(unhold_cmd)
),
)
def setup_apt_config(self, progress: api.ProgressWrapper) -> None:
"""Setup apt config based on the resourceToken and directives.
FIPS-specifically handle apt-mark unhold
:raise UbuntuProError: on failure to setup any aspect of this apt
configuration
"""
self.unhold_packages(self.fips_pro_package_holds)
super().setup_apt_config(progress)
class FIPSEntitlement(FIPSCommonEntitlement):
name = "fips"
title = messages.FIPS_TITLE
description = messages.FIPS_DESCRIPTION
help_text = messages.FIPS_HELP_TEXT
origin = "UbuntuFIPS"
pre_enable_msg = messages.PROMPT_FIPS_PRE_ENABLE
@property
def incompatible_services(self) -> Tuple[EntitlementWithMessage, ...]:
from uaclient.entitlements.livepatch import LivepatchEntitlement
from uaclient.entitlements.realtime import RealtimeKernelEntitlement
return (
EntitlementWithMessage(
LivepatchEntitlement, messages.LIVEPATCH_INVALIDATES_FIPS
),
EntitlementWithMessage(
FIPSUpdatesEntitlement, messages.FIPS_UPDATES_INVALIDATES_FIPS
),
EntitlementWithMessage(
RealtimeKernelEntitlement, messages.REALTIME_FIPS_INCOMPATIBLE
),
)
@property
def static_affordances(self) -> Tuple[StaticAffordance, ...]:
static_affordances = super().static_affordances
fips_updates = FIPSUpdatesEntitlement(cfg=self.cfg)
enabled_status = ApplicationStatus.ENABLED
is_fips_updates_enabled = bool(
fips_updates.application_status()[0] == enabled_status
)
services_once_enabled_obj = services_once_enabled_file.read()
fips_updates_once_enabled = (
services_once_enabled_obj.fips_updates
if services_once_enabled_obj
else False
)
return static_affordances + (
(
messages.FIPS_ERROR_WHEN_FIPS_UPDATES_ENABLED.format(
fips=self.title, fips_updates=fips_updates.title
),
lambda: is_fips_updates_enabled,
False,
),
(
messages.FIPS_ERROR_WHEN_FIPS_UPDATES_ONCE_ENABLED.format(
fips=self.title, fips_updates=fips_updates.title
),
lambda: fips_updates_once_enabled,
False,
),
)
def _perform_enable(self, progress: api.ProgressWrapper) -> bool:
cloud_type, error = get_cloud_type()
if cloud_type is None and error == NoCloudTypeReason.CLOUD_ID_ERROR:
LOG.warning(
"Could not determine cloud, "
"defaulting to generic FIPS package."
)
event.info(messages.FIPS_COULD_NOT_DETERMINE_CLOUD_DEFAULT_PACKAGE)
if super()._perform_enable(progress):
notices.remove(
Notice.FIPS_INSTALL_OUT_OF_DATE,
)
return True
return False
class FIPSUpdatesEntitlement(FIPSCommonEntitlement):
name = "fips-updates"
title = messages.FIPS_UPDATES_TITLE
origin = "UbuntuFIPSUpdates"
description = messages.FIPS_UPDATES_DESCRIPTION
help_text = messages.FIPS_UPDATES_HELP_TEXT
pre_enable_msg = messages.PROMPT_FIPS_UPDATES_PRE_ENABLE
@property
def incompatible_services(self) -> Tuple[EntitlementWithMessage, ...]:
from uaclient.entitlements.realtime import RealtimeKernelEntitlement
return (
EntitlementWithMessage(
FIPSEntitlement, messages.FIPS_INVALIDATES_FIPS_UPDATES
),
EntitlementWithMessage(
RealtimeKernelEntitlement,
messages.REALTIME_FIPS_UPDATES_INCOMPATIBLE,
),
)
def _perform_enable(self, progress: api.ProgressWrapper) -> bool:
if super()._perform_enable(progress=progress):
services_once_enabled_file.write(
ServicesOnceEnabledData(fips_updates=True)
)
return True
return False
class FIPSPreviewEntitlement(FIPSEntitlement):
name = "fips-preview"
title = messages.FIPS_PREVIEW_TITLE
description = messages.FIPS_PREVIEW_DESCRIPTION
help_text = messages.FIPS_PREVIEW_HELP_TEXT
origin = "UbuntuFIPSPreview"
pre_enable_msg = messages.PROMPT_FIPS_PREVIEW_PRE_ENABLE
repo_key_file = "ubuntu-pro-fips-preview.gpg"
@property
def incompatible_services(self) -> Tuple[EntitlementWithMessage, ...]:
return super().incompatible_services + (
EntitlementWithMessage(
FIPSEntitlement, messages.FIPS_INVALIDATES_FIPS_UPDATES
),
)
def _allow_fips_on_cloud_instance(
self, series: str, cloud_id: str
) -> bool:
# For fips-preview, we should not block the service
# if there is no FIPS cloud-optimized kernel. That is
# because this service is intended as an early access for
# FIPS service, so users should be aware of the risks
return True