Current File : //usr/lib/python3/dist-packages/uaclient/security.py
import copy
import enum
import os
import socket
import textwrap
from collections import defaultdict
from datetime import datetime
from typing import Any, Dict, List, NamedTuple, Optional, Set, Tuple
from uaclient import apt, exceptions, messages, serviceclient, util
from uaclient.clouds.identity import (
CLOUD_TYPE_TO_TITLE,
PRO_CLOUDS,
get_cloud_type,
)
from uaclient.config import UAConfig
from uaclient.defaults import BASE_UA_URL, PRINT_WRAP_WIDTH
from uaclient.entitlements import entitlement_factory
from uaclient.entitlements.entitlement_status import (
ApplicabilityStatus,
UserFacingStatus,
)
from uaclient.status import colorize_commands
CVE_OR_USN_REGEX = (
r"((CVE|cve)-\d{4}-\d{4,7}$|(USN|usn|LSN|lsn)-\d{1,5}-\d{1,2}$)"
)
API_V1_CVES = "cves.json"
API_V1_CVE_TMPL = "cves/{cve}.json"
API_V1_NOTICES = "notices.json"
API_V1_NOTICE_TMPL = "notices/{notice}.json"
UBUNTU_STANDARD_UPDATES_POCKET = "Ubuntu standard updates"
UA_INFRA_POCKET = "UA Infra"
UA_APPS_POCKET = "UA Apps"
ReleasedPackagesInstallResult = NamedTuple(
"ReleasedPackagesInstallResult",
[
("fix_status", bool),
("unfixed_pkgs", Set[str]),
("installed_pkgs", Set[str]),
("all_already_installed", bool),
],
)
@enum.unique
class FixStatus(enum.Enum):
"""
An enum to represent the system status after fix operation
"""
SYSTEM_NON_VULNERABLE = 0
SYSTEM_STILL_VULNERABLE = 1
SYSTEM_VULNERABLE_UNTIL_REBOOT = 2
class UASecurityClient(serviceclient.UAServiceClient):
url_timeout = 20
cfg_url_base_attr = "security_url"
api_error_cls = exceptions.SecurityAPIError
def _get_query_params(
self, query_params: Dict[str, Any]
) -> Dict[str, Any]:
"""
Update query params with data from feature config.
"""
extra_security_params = self.cfg.cfg.get("features", {}).get(
"extra_security_params", {}
)
if query_params:
query_params.update(extra_security_params)
return query_params
return extra_security_params
@util.retry(socket.timeout, retry_sleeps=[1, 3, 5])
def request_url(
self, path, data=None, headers=None, method=None, query_params=None
):
query_params = self._get_query_params(query_params)
return super().request_url(
path=path,
data=data,
headers=headers,
method=method,
query_params=query_params,
potentially_sensitive=False,
)
def get_cves(
self,
query: Optional[str] = None,
priority: Optional[str] = None,
package: Optional[str] = None,
limit: Optional[int] = None,
offset: Optional[int] = None,
component: Optional[str] = None,
version: Optional[str] = None,
status: Optional[List[str]] = None,
) -> List["CVE"]:
"""Query to match multiple-CVEs.
@return: List of CVE instances based on the the JSON response.
"""
query_params = {
"q": query,
"priority": priority,
"package": package,
"limit": limit,
"offset": offset,
"component": component,
"version": version,
"status": status,
}
cves_response, _headers = self.request_url(
API_V1_CVES, query_params=query_params
)
return [CVE(client=self, response=cve_md) for cve_md in cves_response]
def get_cve(self, cve_id: str) -> "CVE":
"""Query to match single-CVE.
@return: CVE instance for JSON response from the Security API.
"""
cve_response, _headers = self.request_url(
API_V1_CVE_TMPL.format(cve=cve_id)
)
return CVE(client=self, response=cve_response)
def get_notices(
self,
details: Optional[str] = None,
release: Optional[str] = None,
limit: Optional[int] = None,
offset: Optional[int] = None,
order: Optional[str] = None,
) -> List["USN"]:
"""Query to match multiple-USNs.
@return: Sorted list of USN instances based on the the JSON response.
"""
query_params = {
"details": details,
"release": release,
"limit": limit,
"offset": offset,
"order": order,
}
usns_response, _headers = self.request_url(
API_V1_NOTICES, query_params=query_params
)
return sorted(
[
USN(client=self, response=usn_md)
for usn_md in usns_response.get("notices", [])
if details is None or details in usn_md.get("cves_ids", [])
],
key=lambda x: x.id,
)
def get_notice(self, notice_id: str) -> "USN":
"""Query to match single-USN.
@return: USN instance representing the JSON response.
"""
notice_response, _headers = self.request_url(
API_V1_NOTICE_TMPL.format(notice=notice_id)
)
return USN(client=self, response=notice_response)
# Model for Security API responses
class CVEPackageStatus:
"""Class representing specific CVE PackageStatus on an Ubuntu series"""
def __init__(self, cve_response: Dict[str, Any]):
self.response = cve_response
@property
def description(self):
return self.response["description"]
@property
def fixed_version(self):
return self.description
@property
def pocket(self):
return self.response["pocket"]
@property
def release_codename(self):
return self.response["release_codename"]
@property
def status(self):
return self.response["status"]
@property
def status_message(self):
if self.status == "needed":
return "Sorry, no fix is available yet."
elif self.status == "needs-triage":
return "Ubuntu security engineers are investigating this issue."
elif self.status == "pending":
return "A fix is coming soon. Try again tomorrow."
elif self.status in ("ignored", "deferred"):
return "Sorry, no fix is available."
elif self.status == "DNE":
return "Source package does not exist on this release."
elif self.status == "not-affected":
return "Source package is not affected on this release."
elif self.status == "released":
return messages.SECURITY_FIX_RELEASE_STREAM.format(
fix_stream=self.pocket_source
)
return "UNKNOWN: {}".format(self.status)
@property
def requires_ua(self) -> bool:
"""Return True if the package requires an active UA subscription."""
return bool(self.pocket_source != UBUNTU_STANDARD_UPDATES_POCKET)
@property
def pocket_source(self):
"""Human-readable string representing where the fix is published."""
if self.pocket == "esm-infra":
fix_source = UA_INFRA_POCKET
elif self.pocket == "esm-apps":
fix_source = UA_APPS_POCKET
elif self.pocket in ("updates", "security"):
fix_source = UBUNTU_STANDARD_UPDATES_POCKET
else:
# TODO(GH: #1376 drop this when esm* pockets supplied by API)
if "esm" in self.fixed_version:
fix_source = UA_INFRA_POCKET
else:
fix_source = UBUNTU_STANDARD_UPDATES_POCKET
return fix_source
class CVE:
"""Class representing CVE response from the SecurityClient"""
def __init__(self, client: UASecurityClient, response: Dict[str, Any]):
self.response = response
self.client = client
def __eq__(self, other) -> bool:
if not isinstance(other, CVE):
return False
return self.response == other.response
@property
def id(self):
return self.response.get("id", "UNKNOWN_CVE_ID").upper()
def get_url_header(self):
"""Return a string representing the URL for this cve."""
title = self.description
for notice in self.notices:
# Only look at the most recent USN title
title = notice.title
break
lines = [
"{issue}: {title}".format(issue=self.id, title=title),
"https://ubuntu.com/security/{}".format(self.id),
]
return "\n".join(lines)
@property
def notices_ids(self) -> List[str]:
return self.response.get("notices_ids", [])
@property
def notices(self) -> List["USN"]:
"""Return a list of USN instances from API response 'notices'.
Cache the value to avoid extra work on multiple calls.
"""
if not hasattr(self, "_notices"):
self._notices = sorted(
[
USN(self.client, notice)
for notice in self.response.get("notices", [])
],
key=lambda n: n.id,
reverse=True,
)
return self._notices
@property
def description(self):
return self.response.get("description")
@property
def packages_status(self) -> Dict[str, CVEPackageStatus]:
"""Dict of package status dicts for the current Ubuntu series.
Top-level keys are source packages names and each value is a
CVEPackageStatus object
"""
if hasattr(self, "_packages_status"):
return self._packages_status # type: ignore
self._packages_status = {}
series = util.get_platform_info()["series"]
for package in self.response["packages"]:
for pkg_status in package["statuses"]:
if pkg_status["release_codename"] == series:
self._packages_status[package["name"]] = CVEPackageStatus(
pkg_status
)
return self._packages_status
class USN:
"""Class representing USN response from the SecurityClient"""
def __init__(self, client: UASecurityClient, response: Dict[str, Any]):
self.response = response
self.client = client
def __eq__(self, other) -> bool:
if not isinstance(other, USN):
return False
return self.response == other.response
@property
def id(self) -> str:
return self.response.get("id", "UNKNOWN_USN_ID").upper()
@property
def cves_ids(self) -> List[str]:
"""List of CVE IDs related to this USN."""
return self.response.get("cves_ids", [])
@property
def cves(self) -> List[CVE]:
"""List of CVE instances based on API response 'cves' key.
Cache the values to avoid extra work for multiple call-sites.
"""
if not hasattr(self, "_cves"):
self._cves = sorted(
[
CVE(self.client, cve)
for cve in self.response.get("cves", [])
],
key=lambda n: n.id,
reverse=True,
) # type: List[CVE]
return self._cves
@property
def title(self):
return self.response.get("title")
@property
def references(self):
return self.response.get("references")
def get_url_header(self):
"""Return a string representing the URL for this notice."""
lines = ["{issue}: {title}".format(issue=self.id, title=self.title)]
if self.cves_ids:
lines.append("Found CVEs:")
for cve in self.cves_ids:
lines.append("https://ubuntu.com/security/{}".format(cve))
elif self.references:
lines.append("Found Launchpad bugs:")
for reference in self.references:
lines.append(reference)
return "\n".join(lines)
@property
def release_packages(self) -> Dict[str, Dict[str, Dict[str, str]]]:
"""Binary package information available for this release.
Reformat the USN.release_packages response to key it based on source
package name and related binary package names.
:return: Dict keyed by source package name. The second-level key will
be binary package names generated from that source package and the
values will be the dict response from USN.release_packages for
that binary package. The binary metadata contains the following
keys: name, version.
Optional additional keys: pocket and component.
"""
if hasattr(self, "_release_packages"):
return self._release_packages
series = util.get_platform_info()["series"]
self._release_packages = {} # type: Dict[str, Dict[str, Any]]
# Organize source and binary packages under a common source package key
for pkg in self.response.get("release_packages", {}).get(series, []):
if pkg.get("is_source"):
# Create a "source" key under src_pkg_name with API response
if pkg["name"] in self._release_packages:
if "source" in self._release_packages[pkg["name"]]:
raise exceptions.SecurityAPIMetadataError(
"{usn} metadata defines duplicate source packages"
" {pkg}".format(usn=self.id, pkg=pkg["name"]),
issue_id=self.id,
)
self._release_packages[pkg["name"]]["source"] = pkg
else:
self._release_packages[pkg["name"]] = {"source": pkg}
else:
# is_source == False or None, then this is a binary package.
# If processed before a source item, the top-level key will
# not exist yet.
# TODO(GH: 1465: determine if this is expected on kern pkgs)
if not pkg.get("source_link"):
raise exceptions.SecurityAPIMetadataError(
"{issue} metadata does not define release_packages"
" source_link for {bin_pkg}.".format(
issue=self.id, bin_pkg=pkg["name"]
),
issue_id=self.id,
)
elif "/" not in pkg["source_link"]:
raise exceptions.SecurityAPIMetadataError(
"{issue} metadata has unexpected release_packages"
" source_link value for {bin_pkg}: {link}".format(
issue=self.id,
bin_pkg=pkg["name"],
link=pkg["source_link"],
),
issue_id=self.id,
)
source_pkg_name = pkg["source_link"].split("/")[-1]
if source_pkg_name not in self._release_packages:
self._release_packages[source_pkg_name] = {}
self._release_packages[source_pkg_name][pkg["name"]] = pkg
return self._release_packages
def query_installed_source_pkg_versions() -> Dict[str, Dict[str, str]]:
"""Return a dict of all source packages installed on the system.
The dict keys will be source package name: "krb5". The value will be a dict
with keys binary_pkg and version.
"""
status_field = "${db:Status-Status}"
out, _err = util.subp(
[
"dpkg-query",
"-f=${Package},${Source},${Version}," + status_field + "\n",
"-W",
]
)
installed_packages = {} # type: Dict[str, Dict[str, str]]
for pkg_line in out.splitlines():
pkg_name, source_pkg_name, pkg_version, status = pkg_line.split(",")
if not source_pkg_name:
# some package don't define the Source
source_pkg_name = pkg_name
if "installed" not in status:
continue
if source_pkg_name in installed_packages:
installed_packages[source_pkg_name][pkg_name] = pkg_version
else:
installed_packages[source_pkg_name] = {pkg_name: pkg_version}
return installed_packages
def merge_usn_released_binary_package_versions(
usns: List[USN], beta_pockets: Dict[str, bool]
) -> Dict[str, Dict[str, Dict[str, str]]]:
"""Walk related USNs, merging the released binary package versions.
For each USN, iterate over release_packages to collect released binary
package names and required fix version. If multiple related USNs
require different version fixes to the same binary package, track the
maximum version required across all USNs.
:param usns: List of USN response instances from which to calculate merge.
:param beta_pockets: Dict keyed on service name: esm-infra, esm-apps
the values of which will be true of USN response instances
from which to calculate merge.
:return: Dict keyed by source package name. Under each source package will
be a dict with binary package name as keys and binary package metadata
as the value.
"""
usn_pkg_versions = {}
for usn in usns:
# Aggregate USN.release_package binary versions into usn_pkg_versions
for src_pkg, binary_pkg_versions in usn.release_packages.items():
public_bin_pkg_versions = {
bin_pkg_name: bin_pkg_md
for bin_pkg_name, bin_pkg_md in binary_pkg_versions.items()
if False
is beta_pockets.get(bin_pkg_md.get("pocket", "None"), False)
}
if src_pkg not in usn_pkg_versions and public_bin_pkg_versions:
usn_pkg_versions[src_pkg] = public_bin_pkg_versions
elif src_pkg in usn_pkg_versions:
# Since src_pkg exists, only record this USN's binary version
# when it is greater than the previous version in usn_src_pkg.
usn_src_pkg = usn_pkg_versions[src_pkg]
for bin_pkg, binary_pkg_md in public_bin_pkg_versions.items():
if bin_pkg not in usn_src_pkg:
usn_src_pkg[bin_pkg] = binary_pkg_md
else:
prev_version = usn_src_pkg[bin_pkg]["version"]
current_version = binary_pkg_md["version"]
if not version_cmp_le(current_version, prev_version):
# binary_version is greater than prev_version
usn_src_pkg[bin_pkg] = binary_pkg_md
return usn_pkg_versions
def get_related_usns(usn, client):
"""For a give usn, get the related USNs for it.
For each CVE associated with the given USN, we capture
other USNs that are related to the CVE. We consider those
USNs related to the original USN.
"""
# If the usn does not have any associated cves on it,
# we must consider that only the current usn should be
# evaluated.
if not usn.cves:
return [usn]
related_usns = {}
for cve in usn.cves:
for related_usn_id in cve.notices_ids:
if related_usn_id not in related_usns:
related_usns[related_usn_id] = client.get_notice(
notice_id=related_usn_id
)
return list(sorted(related_usns.values(), key=lambda x: x.id))
def fix_security_issue_id(cfg: UAConfig, issue_id: str) -> FixStatus:
issue_id = issue_id.upper()
client = UASecurityClient(cfg=cfg)
installed_packages = query_installed_source_pkg_versions()
# Used to filter out beta pockets during merge_usns
beta_pockets = {
"esm-apps": _is_pocket_used_by_beta_service(UA_APPS_POCKET, cfg),
"esm-infra": _is_pocket_used_by_beta_service(UA_INFRA_POCKET, cfg),
}
if "CVE" in issue_id:
try:
cve = client.get_cve(cve_id=issue_id)
usns = client.get_notices(details=issue_id)
except exceptions.SecurityAPIError as e:
msg = str(e)
if "not found" in msg.lower():
msg = messages.SECURITY_FIX_NOT_FOUND_ISSUE.format(
issue_id=issue_id
)
raise exceptions.UserFacingError(msg)
affected_pkg_status = get_cve_affected_source_packages_status(
cve=cve, installed_packages=installed_packages
)
print(cve.get_url_header())
usn_released_pkgs = merge_usn_released_binary_package_versions(
usns, beta_pockets
)
else: # USN
try:
usn = client.get_notice(notice_id=issue_id)
usns = get_related_usns(usn, client)
except exceptions.SecurityAPIError as e:
msg = str(e)
if "not found" in msg.lower():
msg = messages.SECURITY_FIX_NOT_FOUND_ISSUE.format(
issue_id=issue_id
)
raise exceptions.UserFacingError(msg)
affected_pkg_status = get_usn_affected_packages_status(
usn=usn, installed_packages=installed_packages
)
usn_released_pkgs = merge_usn_released_binary_package_versions(
usns, beta_pockets
)
print(usn.get_url_header())
if not usn.response["release_packages"]:
# Since usn.release_packages filters to our current release only
# check overall metadata and error if empty.
raise exceptions.SecurityAPIMetadataError(
"{} metadata defines no fixed package versions.".format(
issue_id
),
issue_id=issue_id,
)
return prompt_for_affected_packages(
cfg=cfg,
issue_id=issue_id,
affected_pkg_status=affected_pkg_status,
installed_packages=installed_packages,
usn_released_pkgs=usn_released_pkgs,
)
def get_affected_packages_from_cves(cves, installed_packages):
affected_pkgs = {} # type: Dict[str, CVEPackageStatus]
for cve in cves:
for pkg_name, pkg_status in get_cve_affected_source_packages_status(
cve, installed_packages
).items():
if pkg_name not in affected_pkgs:
affected_pkgs[pkg_name] = pkg_status
else:
current_ver = affected_pkgs[pkg_name].fixed_version
if not version_cmp_le(current_ver, pkg_status.fixed_version):
affected_pkgs[pkg_name] = pkg_status
return affected_pkgs
def get_affected_packages_from_usn(usn, installed_packages):
affected_pkgs = {} # type: Dict[str, CVEPackageStatus]
for pkg_name, pkg_info in usn.release_packages.items():
if pkg_name not in installed_packages:
continue
cve_response = defaultdict(str)
cve_response["status"] = "released"
# Here we are assuming that the pocket will be the same one across
# the different binary packages.
all_pockets = {
pkg_bin_info["pocket"]
for _, pkg_bin_info in pkg_info.items()
if pkg_bin_info.get("pocket")
}
if not all_pockets:
msg = (
"{} metadata defines no pocket information for "
"any release packages."
)
raise exceptions.SecurityAPIMetadataError(
msg.format(usn.id), issue_id=usn.id
)
cve_response["pocket"] = all_pockets.pop()
affected_pkgs[pkg_name] = CVEPackageStatus(cve_response=cve_response)
return affected_pkgs
def get_usn_affected_packages_status(
usn: USN, installed_packages: Dict[str, Dict[str, str]]
) -> Dict[str, CVEPackageStatus]:
"""Walk CVEs related to a USN and return a dict of all affected packages.
:return: Dict keyed on source package name, with active CVEPackageStatus
for the current Ubuntu release.
"""
if usn.cves:
return get_affected_packages_from_cves(usn.cves, installed_packages)
else:
return get_affected_packages_from_usn(usn, installed_packages)
def get_cve_affected_source_packages_status(
cve: CVE, installed_packages: Dict[str, Dict[str, str]]
) -> Dict[str, CVEPackageStatus]:
"""Get a dict of any CVEPackageStatuses affecting this Ubuntu release.
:return: Dict of active CVEPackageStatus keyed by source package names.
"""
affected_pkg_versions = {}
for source_pkg, package_status in cve.packages_status.items():
if package_status.status == "not-affected":
continue
if source_pkg in installed_packages:
affected_pkg_versions[source_pkg] = package_status
return affected_pkg_versions
def print_affected_packages_header(
issue_id: str, affected_pkg_status: Dict[str, CVEPackageStatus]
):
"""Print header strings describing affected packages related to a CVE/USN.
:param issue_id: String of USN or CVE issue id.
:param affected_pkg_status: Dict keyed on source package name, with active
CVEPackageStatus for the current Ubuntu release.
"""
count = len(affected_pkg_status)
if count == 0:
print(
messages.SECURITY_AFFECTED_PKGS.format(
count="No", plural_str="s are"
)
+ "."
)
print(messages.SECURITY_ISSUE_UNAFFECTED.format(issue=issue_id))
return
if count == 1:
plural_str = " is"
else:
plural_str = "s are"
msg = (
messages.SECURITY_AFFECTED_PKGS.format(
count=count, plural_str=plural_str
)
+ ": "
+ ", ".join(sorted(affected_pkg_status.keys()))
)
print(textwrap.fill(msg, width=PRINT_WRAP_WIDTH, subsequent_indent=" "))
def override_usn_release_package_status(
pkg_status: CVEPackageStatus,
usn_src_released_pkgs: Dict[str, Dict[str, str]],
) -> CVEPackageStatus:
"""Parse release status based on both pkg_status and USN.release_packages.
Since some source packages in universe are not represented in
CVEPackageStatus, rely on presence of such source packages in
usn_src_released_pkgs to represent package as a "released" status.
:param pkg_status: the CVEPackageStatus for this source package.
:param usn_src_released_pkgs: The USN.release_packages representing only
this source package. Normally, release_packages would have data on
multiple source packages.
:return: Tuple of:
human-readable status message, boolean whether released,
boolean whether the fix requires access to UA
"""
usn_pkg_status = copy.deepcopy(pkg_status)
if usn_src_released_pkgs and usn_src_released_pkgs.get("source"):
usn_pkg_status.response["status"] = "released"
usn_pkg_status.response["description"] = usn_src_released_pkgs[
"source"
]["version"]
for pkg_name, usn_released_pkg in usn_src_released_pkgs.items():
# Copy the pocket from any valid binary package
pocket = usn_released_pkg.get("pocket")
if pocket:
usn_pkg_status.response["pocket"] = pocket
break
return usn_pkg_status
def group_by_usn_package_status(affected_pkg_status, usn_released_pkgs):
status_groups = {}
for src_pkg, pkg_status in sorted(affected_pkg_status.items()):
usn_released_src = usn_released_pkgs.get(src_pkg, {})
usn_pkg_status = override_usn_release_package_status(
pkg_status, usn_released_src
)
status_group = usn_pkg_status.status.replace("ignored", "deferred")
if status_group not in status_groups:
status_groups[status_group] = []
status_groups[status_group].append((src_pkg, usn_pkg_status))
return status_groups
def _format_packages_message(
pkg_status_list: List[Tuple[str, CVEPackageStatus]],
pkg_index: int,
num_pkgs: int,
) -> str:
"""Format the packages and status to an user friendly message."""
if not pkg_status_list:
return ""
msg_index = []
src_pkgs = []
for src_pkg, pkg_status in pkg_status_list:
pkg_index += 1
msg_index.append("{}/{}".format(pkg_index, num_pkgs))
src_pkgs.append(src_pkg)
msg_header = textwrap.fill(
"{} {}:".format(
"(" + ", ".join(msg_index) + ")", ", ".join(sorted(src_pkgs))
),
width=PRINT_WRAP_WIDTH,
subsequent_indent=" ",
)
return "{}\n{}".format(msg_header, pkg_status.status_message)
def _get_service_for_pocket(pocket: str, cfg: UAConfig):
service_to_check = "no-service-needed"
if pocket == UA_INFRA_POCKET:
service_to_check = "esm-infra"
elif pocket == UA_APPS_POCKET:
service_to_check = "esm-apps"
ent_cls = entitlement_factory(cfg=cfg, name=service_to_check)
return ent_cls(cfg) if ent_cls else None
def _is_pocket_used_by_beta_service(pocket: str, cfg: UAConfig) -> bool:
"""Check if the pocket where the fix is at belongs to a beta service."""
ent = _get_service_for_pocket(pocket, cfg)
if ent:
ent_status, _ = ent.user_facing_status()
# If the service is already enabled, we proceed with the fix
# even if the service is a beta stage.
if ent_status == UserFacingStatus.ACTIVE:
return False
return not ent.valid_service
return False
def _handle_released_package_fixes(
cfg: UAConfig,
src_pocket_pkgs: Dict[str, List[Tuple[str, CVEPackageStatus]]],
binary_pocket_pkgs: Dict[str, List[str]],
pkg_index: int,
num_pkgs: int,
) -> ReleasedPackagesInstallResult:
"""Handle the packages that could be fixed and have a released status.
:returns: Tuple of
boolean whether all packages were successfully upgraded,
list of strings containing the packages that were not upgraded,
boolean whether all packages were already installed
"""
all_already_installed = True
upgrade_status = True
unfixed_pkgs = set()
installed_pkgs = set()
if src_pocket_pkgs:
for pocket in [
UBUNTU_STANDARD_UPDATES_POCKET,
UA_INFRA_POCKET,
UA_APPS_POCKET,
]:
pkg_src_group = src_pocket_pkgs[pocket]
binary_pkgs = binary_pocket_pkgs[pocket]
if upgrade_status:
msg = _format_packages_message(
pkg_status_list=pkg_src_group,
pkg_index=pkg_index,
num_pkgs=num_pkgs,
)
if msg:
print(msg)
if not binary_pkgs:
print(messages.SECURITY_UPDATE_INSTALLED)
continue
else:
# if even one pocket has binary_pkgs to install
# then we can't say that everything was already
# installed.
all_already_installed = False
pkg_index += len(pkg_src_group)
upgrade_status &= upgrade_packages_and_attach(
cfg, binary_pkgs, pocket
)
if not upgrade_status:
unfixed_pkgs.update([src_pkg for src_pkg, _ in pkg_src_group])
else:
installed_pkgs.update(binary_pkgs)
return ReleasedPackagesInstallResult(
fix_status=upgrade_status,
unfixed_pkgs=unfixed_pkgs,
installed_pkgs=installed_pkgs,
all_already_installed=all_already_installed,
)
def _format_unfixed_packages_msg(unfixed_pkgs: List[str]) -> str:
"""Format the list of unfixed packages into an message.
:returns: A string containing the message output for the unfixed
packages.
"""
num_pkgs_unfixed = len(unfixed_pkgs)
return textwrap.fill(
"{} package{} {} still affected: {}".format(
num_pkgs_unfixed,
"s" if num_pkgs_unfixed > 1 else "",
"are" if num_pkgs_unfixed > 1 else "is",
", ".join(sorted(unfixed_pkgs)),
),
width=PRINT_WRAP_WIDTH,
subsequent_indent=" ",
)
def prompt_for_affected_packages(
cfg: UAConfig,
issue_id: str,
affected_pkg_status: Dict[str, CVEPackageStatus],
installed_packages: Dict[str, Dict[str, str]],
usn_released_pkgs: Dict[str, Dict[str, Dict[str, str]]],
) -> FixStatus:
"""Process security CVE dict returning a CVEStatus object.
Since CVEs point to a USN if active, get_notice may be called to fill in
CVE title details.
:returns: An FixStatus enum value corresponding to the system state
after processing the affected packages
"""
count = len(affected_pkg_status)
print_affected_packages_header(issue_id, affected_pkg_status)
if count == 0:
return FixStatus.SYSTEM_NON_VULNERABLE
fix_message = messages.SECURITY_ISSUE_RESOLVED.format(issue=issue_id)
src_pocket_pkgs = defaultdict(list)
binary_pocket_pkgs = defaultdict(list)
pkg_index = 0
pkg_status_groups = group_by_usn_package_status(
affected_pkg_status, usn_released_pkgs
)
unfixed_pkgs = []
for status_value, pkg_status_group in sorted(pkg_status_groups.items()):
if status_value != "released":
fix_message = messages.SECURITY_ISSUE_NOT_RESOLVED.format(
issue=issue_id
)
print(
_format_packages_message(
pkg_status_list=pkg_status_group,
pkg_index=pkg_index,
num_pkgs=count,
)
)
pkg_index += len(pkg_status_group)
unfixed_pkgs += [src_pkg for src_pkg, _ in pkg_status_group]
else:
for src_pkg, pkg_status in pkg_status_group:
src_pocket_pkgs[pkg_status.pocket_source].append(
(src_pkg, pkg_status)
)
for binary_pkg, version in installed_packages[src_pkg].items():
usn_released_src = usn_released_pkgs.get(src_pkg, {})
if binary_pkg not in usn_released_src:
unfixed_pkgs += [
src_pkg for src_pkg, _ in pkg_status_group
]
msg = (
"{issue} metadata defines no fixed version for"
" {pkg}.\n".format(pkg=binary_pkg, issue=issue_id)
)
msg += _format_unfixed_packages_msg(unfixed_pkgs)
raise exceptions.SecurityAPIMetadataError(
msg, issue_id
)
fixed_pkg = usn_released_src[binary_pkg]
fixed_version = fixed_pkg["version"] # type: ignore
if not version_cmp_le(fixed_version, version):
binary_pocket_pkgs[pkg_status.pocket_source].append(
binary_pkg
)
released_pkgs_install_result = _handle_released_package_fixes(
cfg=cfg,
src_pocket_pkgs=src_pocket_pkgs,
binary_pocket_pkgs=binary_pocket_pkgs,
pkg_index=pkg_index,
num_pkgs=count,
)
unfixed_pkgs += released_pkgs_install_result.unfixed_pkgs
if unfixed_pkgs:
print(_format_unfixed_packages_msg(unfixed_pkgs))
if released_pkgs_install_result.fix_status:
# fix_status is True if either:
# (1) we successfully installed all the packages we needed to
# (2) we didn't need to install any packages
# In case (2), then all_already_installed is also True
if released_pkgs_install_result.all_already_installed:
# we didn't install any packages, so we're good
print(util.handle_unicode_characters(fix_message))
return (
FixStatus.SYSTEM_STILL_VULNERABLE
if unfixed_pkgs
else FixStatus.SYSTEM_NON_VULNERABLE
)
elif util.should_reboot(
installed_pkgs=released_pkgs_install_result.installed_pkgs
):
# we successfully installed some packages, but
# system reboot-required. This might be because
# or our installations.
reboot_msg = messages.ENABLE_REBOOT_REQUIRED_TMPL.format(
operation="fix operation"
)
print(reboot_msg)
cfg.add_notice("", reboot_msg)
print(
util.handle_unicode_characters(
messages.SECURITY_ISSUE_NOT_RESOLVED.format(issue=issue_id)
)
)
return FixStatus.SYSTEM_VULNERABLE_UNTIL_REBOOT
else:
# we successfully installed some packages, and the system
# reboot-required flag is not set, so we're good
print(util.handle_unicode_characters(fix_message))
return (
FixStatus.SYSTEM_STILL_VULNERABLE
if unfixed_pkgs
else FixStatus.SYSTEM_NON_VULNERABLE
)
else:
print(
util.handle_unicode_characters(
messages.SECURITY_ISSUE_NOT_RESOLVED.format(issue=issue_id)
)
)
return FixStatus.SYSTEM_STILL_VULNERABLE
def _inform_ubuntu_pro_existence_if_applicable() -> None:
"""Alert the user when running UA on cloud with PRO support."""
cloud_type, _ = get_cloud_type()
if cloud_type in PRO_CLOUDS:
print(
messages.SECURITY_USE_PRO_TMPL.format(
title=CLOUD_TYPE_TO_TITLE.get(cloud_type), cloud=cloud_type
)
)
def _run_ua_attach(cfg: UAConfig, token: str) -> bool:
"""Attach to a UA subscription with a given token.
:return: True if attach performed without errors.
"""
import argparse
from uaclient import cli
print(colorize_commands([["ua", "attach", token]]))
try:
ret_code = cli.action_attach(
argparse.Namespace(
token=token, auto_enable=True, format="cli", attach_config=None
),
cfg,
)
return ret_code == 0
except exceptions.UserFacingError as err:
print(err.msg)
return False
def _prompt_for_attach(cfg: UAConfig) -> bool:
"""Prompt for attach to a subscription or token.
:return: True if attach performed.
"""
_inform_ubuntu_pro_existence_if_applicable()
print(messages.SECURITY_UPDATE_NOT_INSTALLED_SUBSCRIPTION)
choice = util.prompt_choices(
"Choose: [S]ubscribe at ubuntu.com [A]ttach existing token [C]ancel",
valid_choices=["s", "a", "c"],
)
if choice == "c":
return False
if choice == "s":
print(messages.PROMPT_UA_SUBSCRIPTION_URL)
# TODO(GH: #1413: magic subscription attach)
input("Hit [Enter] when subscription is complete.")
if choice in ("a", "s"):
print(messages.PROMPT_ENTER_TOKEN)
token = input("> ")
return _run_ua_attach(cfg, token)
return True
def _prompt_for_enable(cfg: UAConfig, service: str) -> bool:
"""Prompt for enable a ua service.
:return: True if enable performed.
"""
import argparse
from uaclient import cli
print(messages.SECURITY_SERVICE_DISABLED.format(service=service))
choice = util.prompt_choices(
"Choose: [E]nable {} [C]ancel".format(service),
valid_choices=["e", "c"],
)
if choice == "e":
print(colorize_commands([["ua", "enable", service]]))
return bool(
0
== cli.action_enable(
argparse.Namespace(
service=[service],
assume_yes=True,
beta=False,
format="cli",
),
cfg,
)
)
return False
def _check_subscription_for_required_service(
pocket: str, cfg: UAConfig
) -> bool:
"""Verify if the ua subscription has the required service enabled."""
ent = _get_service_for_pocket(pocket, cfg)
if ent:
ent_status, _ = ent.user_facing_status()
if ent_status == UserFacingStatus.ACTIVE:
return True
applicability_status, _ = ent.applicability_status()
if applicability_status == ApplicabilityStatus.APPLICABLE:
if _prompt_for_enable(cfg, ent.name):
return True
else:
print(
messages.SECURITY_UA_SERVICE_NOT_ENABLED.format(
service=ent.name
)
)
else:
print(
messages.SECURITY_UA_SERVICE_NOT_ENTITLED.format(
service=ent.name
)
)
return False
def _prompt_for_new_token(cfg: UAConfig) -> bool:
"""Prompt for attach a new subscription token to the user.
:return: True if attach performed.
"""
import argparse
from uaclient import cli
_inform_ubuntu_pro_existence_if_applicable()
print(messages.SECURITY_UPDATE_NOT_INSTALLED_EXPIRED)
choice = util.prompt_choices(
"Choose: [R]enew your subscription (at {}) [C]ancel".format(
BASE_UA_URL
),
valid_choices=["r", "c"],
)
if choice == "r":
print(messages.PROMPT_EXPIRED_ENTER_TOKEN)
token = input("> ")
print(colorize_commands([["ua", "detach"]]))
cli.action_detach(
argparse.Namespace(assume_yes=True, format="cli"), cfg
)
return _run_ua_attach(cfg, token)
return False
def _check_subscription_is_expired(cfg: UAConfig) -> bool:
"""Check if user UA subscription is expired.
:returns: True if subscription is expired and not renewed.
"""
contract_expiry_datetime = cfg.contract_expiry_datetime
tzinfo = contract_expiry_datetime.tzinfo
if contract_expiry_datetime < datetime.now(tzinfo):
return not _prompt_for_new_token(cfg)
return False
def upgrade_packages_and_attach(
cfg: UAConfig, upgrade_packages: List[str], pocket: str
) -> bool:
"""Upgrade available packages to fix a CVE.
Upgrade all packages in upgrades_packages and, if necessary,
prompt regarding system attach prior to upgrading UA packages.
:return: True if package upgrade completed or unneeded, False otherwise.
"""
if not upgrade_packages:
return True
if os.getuid() != 0:
print(messages.SECURITY_APT_NON_ROOT)
return False
if pocket != UBUNTU_STANDARD_UPDATES_POCKET:
if not cfg.is_attached:
if not _prompt_for_attach(cfg):
return False # User opted to cancel
elif _check_subscription_is_expired(cfg):
# UA subscription is expired and the user has not
# renewed it
return False
if not _check_subscription_for_required_service(pocket, cfg):
# User subscription does not have required service enabled
return False
print(
colorize_commands(
[
["apt", "update", "&&"]
+ ["apt", "install", "--only-upgrade", "-y"]
+ sorted(upgrade_packages)
]
)
)
apt.run_apt_update_command()
apt.run_apt_command(
cmd=["apt-get", "install", "--only-upgrade", "-y"] + upgrade_packages,
error_msg=messages.APT_INSTALL_FAILED.msg,
env={"DEBIAN_FRONTEND": "noninteractive"},
)
return True
def version_cmp_le(version1: str, version2: str) -> bool:
"""Return True when version1 is less than or equal to version2."""
try:
util.subp(["dpkg", "--compare-versions", version1, "le", version2])
return True
except exceptions.ProcessExecutionError:
return False
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