diff --git a/backend/README.md b/backend/README.md index da298c3..38657f8 100644 --- a/backend/README.md +++ b/backend/README.md @@ -1,11 +1,10 @@ -# Litmus Operator +# Litmus Backend K8s Operator [![CharmHub Badge](https://charmhub.io/litmus-backend-k8s/badge.svg)](https://charmhub.io/litmus-backend-k8s) [![Release](https://github.com/canonical/litmus-operators/actions/workflows/release.yaml/badge.svg)](https://github.com/canonical/litmus-operators/actions/workflows/release.yaml) [![Discourse Status](https://img.shields.io/discourse/status?server=https%3A%2F%2Fdiscourse.charmhub.io&style=flat&label=CharmHub%20Discourse)](https://discourse.charmhub.io) -This directory contains the source code for a Charmed Operator that partially drives [LitmusChaos] on Kubernetes. It is designed to work together with other charms to deploy and operate the control plane of LitmusChaos, an open source platform for chaos testing. - +This directory contains the source code for a Charmed Litmus Backend K8s Operator that partially drives [LitmusChaos] on Kubernetes. It is designed to work together with other charms to deploy and operate the control plane of LitmusChaos, an open source platform for chaos testing. ## Usage @@ -15,8 +14,18 @@ Assuming you have access to a bootstrapped Juju controller on Kubernetes, you ca $ juju deploy litmus-backend-k8s # --trust (use when cluster has RBAC enabled) ``` +### Enabling Transport Layer Security (TLS) + +Litmus Backend K8s Operator supports integration with TLS certificates over the `tls-certificates` charm interface. Example: + +```bash +$ juju deploy self-signed-certificates --channel=1/stable +$ juju integrate litmus-backend-k8s self-signed-certificates +``` + ## OCI Images +**litmuschaos-server**: ubuntu/litmuschaos-server:3-24.04_edge ## Contributing diff --git a/backend/charmcraft.yaml b/backend/charmcraft.yaml index ab36537..ebe4f57 100644 --- a/backend/charmcraft.yaml +++ b/backend/charmcraft.yaml @@ -18,6 +18,9 @@ summary: | containers: backend: resource: litmus-backend-image + mounts: + - storage: certs + location: /etc/tls resources: litmus-backend-image: @@ -25,6 +28,10 @@ resources: description: OCI image for Litmus Backend server upstream-source: ubuntu/litmuschaos-server:3-24.04_edge +storage: + certs: + type: filesystem + minimum-size: 1M links: documentation: https://discourse.charmhub.io/t/18790 @@ -48,6 +55,12 @@ requires: limit: 1 description: | Exchange the gRPC server endpoints of the auth and backend components. + tls-certificates: + optional: true + interface: tls-certificates + limit: 1 + description: | + Receive TLS certificates. provides: http-api: @@ -64,7 +77,14 @@ parts: charm: source: . plugin: uv - build-packages: [git] # handy for git+ dependencies during development + build-packages: + - git # handy for git+ dependencies during development + # Required by the tls_certificates_interface + - cargo + - libffi-dev + - libssl-dev + - pkg-config + - rustc build-snaps: [astral-uv] # FIXME: override-build with "git describe --always > $CRAFT_PART_INSTALL/version" causes # charm pack to fail "fatal: not a git repository (or any of the parent directories): .git" diff --git a/backend/lib/charms/tls_certificates_interface/v4/tls_certificates.py b/backend/lib/charms/tls_certificates_interface/v4/tls_certificates.py new file mode 100644 index 0000000..0b680d5 --- /dev/null +++ b/backend/lib/charms/tls_certificates_interface/v4/tls_certificates.py @@ -0,0 +1,2001 @@ +# Copyright 2024 Canonical Ltd. +# See LICENSE file for licensing details. + +"""Charm library for managing TLS certificates (V4). + +This library contains the Requires and Provides classes for handling the tls-certificates +interface. + +Pre-requisites: + - Juju >= 3.0 + - cryptography >= 43.0.0 + - pydantic >= 1.0 + +Learn more on how-to use the TLS Certificates interface library by reading the documentation: +- https://charmhub.io/tls-certificates-interface/ + +""" # noqa: D214, D405, D411, D416 + +import copy +import ipaddress +import json +import logging +import uuid +from contextlib import suppress +from dataclasses import dataclass +from datetime import datetime, timedelta, timezone +from enum import Enum +from typing import FrozenSet, List, MutableMapping, Optional, Tuple, Union + +import pydantic +from cryptography import x509 +from cryptography.exceptions import InvalidSignature +from cryptography.hazmat.primitives import hashes, serialization +from cryptography.hazmat.primitives.asymmetric import rsa +from cryptography.x509.oid import ExtensionOID, NameOID +from ops import BoundEvent, CharmBase, CharmEvents, Secret, SecretExpiredEvent, SecretRemoveEvent +from ops.framework import EventBase, EventSource, Handle, Object +from ops.jujuversion import JujuVersion +from ops.model import ( + Application, + ModelError, + Relation, + SecretNotFoundError, + Unit, +) + +# The unique Charmhub library identifier, never change it +LIBID = "afd8c2bccf834997afce12c2706d2ede" + +# Increment this major API version when introducing breaking changes +LIBAPI = 4 + +# Increment this PATCH version before using `charmcraft publish-lib` or reset +# to 0 if you are raising the major API version +LIBPATCH = 21 + +PYDEPS = [ + "cryptography>=43.0.0", + "pydantic", +] + +logger = logging.getLogger(__name__) + + +class TLSCertificatesError(Exception): + """Base class for custom errors raised by this library.""" + + +class DataValidationError(TLSCertificatesError): + """Raised when data validation fails.""" + + +if int(pydantic.version.VERSION.split(".")[0]) < 2: + + class _DatabagModel(pydantic.BaseModel): # type: ignore + """Base databag model.""" + + class Config: + """Pydantic config.""" + + # ignore any extra fields in the databag + extra = "ignore" + """Ignore any extra fields in the databag.""" + allow_population_by_field_name = True + """Allow instantiating this class by field name (instead of forcing alias).""" + + _NEST_UNDER = None + + @classmethod + def load(cls, databag: MutableMapping): + """Load this model from a Juju databag.""" + if cls._NEST_UNDER: + return cls.parse_obj(json.loads(databag[cls._NEST_UNDER])) + + try: + data = { + k: json.loads(v) + for k, v in databag.items() + # Don't attempt to parse model-external values + if k in {f.alias for f in cls.__fields__.values()} + } + except json.JSONDecodeError as e: + msg = f"invalid databag contents: expecting json. {databag}" + logger.error(msg) + raise DataValidationError(msg) from e + + try: + return cls.parse_raw(json.dumps(data)) # type: ignore + except pydantic.ValidationError as e: + msg = f"failed to validate databag: {databag}" + logger.debug(msg, exc_info=True) + raise DataValidationError(msg) from e + + def dump(self, databag: Optional[MutableMapping] = None, clear: bool = True): + """Write the contents of this model to Juju databag. + + :param databag: the databag to write the data to. + :param clear: ensure the databag is cleared before writing it. + """ + if clear and databag: + databag.clear() + + if databag is None: + databag = {} + + if self._NEST_UNDER: + databag[self._NEST_UNDER] = self.json(by_alias=True, exclude_defaults=True) + return databag + + dct = self.dict(by_alias=True, exclude_defaults=True) + databag.update({k: json.dumps(v) for k, v in dct.items()}) + + return databag + +else: + from pydantic import ConfigDict + + class _DatabagModel(pydantic.BaseModel): + """Base databag model.""" + + model_config = ConfigDict( + # tolerate additional keys in databag + extra="ignore", + # Allow instantiating this class by field name (instead of forcing alias). + populate_by_name=True, + # Custom config key: whether to nest the whole datastructure (as json) + # under a field or spread it out at the toplevel. + _NEST_UNDER=None, # type: ignore + ) + """Pydantic config.""" + + @classmethod + def load(cls, databag: MutableMapping): + """Load this model from a Juju databag.""" + nest_under = cls.model_config.get("_NEST_UNDER") + if nest_under: + return cls.model_validate(json.loads(databag[nest_under])) + + try: + data = { + k: json.loads(v) + for k, v in databag.items() + # Don't attempt to parse model-external values + if k in {(f.alias or n) for n, f in cls.model_fields.items()} + } + except json.JSONDecodeError as e: + msg = f"invalid databag contents: expecting json. {databag}" + logger.error(msg) + raise DataValidationError(msg) from e + + try: + return cls.model_validate_json(json.dumps(data)) + except pydantic.ValidationError as e: + msg = f"failed to validate databag: {databag}" + logger.debug(msg, exc_info=True) + raise DataValidationError(msg) from e + + def dump(self, databag: Optional[MutableMapping] = None, clear: bool = True): + """Write the contents of this model to Juju databag. + + Args: + databag: The databag to write to. + clear: Whether to clear the databag before writing. + + Returns: + MutableMapping: The databag. + """ + if clear and databag: + databag.clear() + + if databag is None: + databag = {} + nest_under = self.model_config.get("_NEST_UNDER") + if nest_under: + databag[nest_under] = self.model_dump_json( + by_alias=True, + # skip keys whose values are default + exclude_defaults=True, + ) + return databag + + dct = self.model_dump(mode="json", by_alias=True, exclude_defaults=True) + databag.update({k: json.dumps(v) for k, v in dct.items()}) + + return databag + + +class _Certificate(pydantic.BaseModel): + """Certificate model.""" + + ca: str + certificate_signing_request: str + certificate: str + chain: Optional[List[str]] = None + revoked: Optional[bool] = None + + def to_provider_certificate(self, relation_id: int) -> "ProviderCertificate": + """Convert to a ProviderCertificate.""" + return ProviderCertificate( + relation_id=relation_id, + certificate=Certificate.from_string(self.certificate), + certificate_signing_request=CertificateSigningRequest.from_string( + self.certificate_signing_request + ), + ca=Certificate.from_string(self.ca), + chain=[Certificate.from_string(certificate) for certificate in self.chain] + if self.chain + else [], + revoked=self.revoked, + ) + + +class _CertificateSigningRequest(pydantic.BaseModel): + """Certificate signing request model.""" + + certificate_signing_request: str + ca: Optional[bool] + + +class _ProviderApplicationData(_DatabagModel): + """Provider application data model.""" + + certificates: List[_Certificate] = [] + + +class _RequirerData(_DatabagModel): + """Requirer data model. + + The same model is used for the unit and application data. + """ + + certificate_signing_requests: List[_CertificateSigningRequest] = [] + + +class Mode(Enum): + """Enum representing the mode of the certificate request. + + UNIT (default): Request a certificate for the unit. + Each unit will manage its private key, + certificate signing request and certificate. + APP: Request a certificate for the application. + Only the leader unit will manage the private key, certificate signing request + and certificate. + """ + + UNIT = 1 + APP = 2 + + +@dataclass(frozen=True) +class PrivateKey: + """This class represents a private key.""" + + raw: str + + def __str__(self): + """Return the private key as a string.""" + return self.raw + + @classmethod + def from_string(cls, private_key: str) -> "PrivateKey": + """Create a PrivateKey object from a private key.""" + return cls(raw=private_key.strip()) + + def is_valid(self) -> bool: + """Validate that the private key is PEM-formatted, RSA, and at least 2048 bits.""" + try: + key = serialization.load_pem_private_key( + self.raw.encode(), + password=None, + ) + + if not isinstance(key, rsa.RSAPrivateKey): + logger.warning("Private key is not an RSA key") + return False + + if key.key_size < 2048: + logger.warning("RSA key size is less than 2048 bits") + return False + + return True + except ValueError: + logger.warning("Invalid private key format") + return False + + +@dataclass(frozen=True) +class Certificate: + """This class represents a certificate.""" + + raw: str + common_name: str + expiry_time: datetime + validity_start_time: datetime + is_ca: bool = False + sans_dns: Optional[FrozenSet[str]] = frozenset() + sans_ip: Optional[FrozenSet[str]] = frozenset() + sans_oid: Optional[FrozenSet[str]] = frozenset() + email_address: Optional[str] = None + organization: Optional[str] = None + organizational_unit: Optional[str] = None + country_name: Optional[str] = None + state_or_province_name: Optional[str] = None + locality_name: Optional[str] = None + + def __str__(self) -> str: + """Return the certificate as a string.""" + return self.raw + + @classmethod + def from_string(cls, certificate: str) -> "Certificate": + """Create a Certificate object from a certificate.""" + try: + certificate_object = x509.load_pem_x509_certificate(data=certificate.encode()) + except ValueError as e: + logger.error("Could not load certificate: %s", e) + raise TLSCertificatesError("Could not load certificate") + + common_name = certificate_object.subject.get_attributes_for_oid(NameOID.COMMON_NAME) + country_name = certificate_object.subject.get_attributes_for_oid(NameOID.COUNTRY_NAME) + state_or_province_name = certificate_object.subject.get_attributes_for_oid( + NameOID.STATE_OR_PROVINCE_NAME + ) + locality_name = certificate_object.subject.get_attributes_for_oid(NameOID.LOCALITY_NAME) + organization_name = certificate_object.subject.get_attributes_for_oid( + NameOID.ORGANIZATION_NAME + ) + organizational_unit = certificate_object.subject.get_attributes_for_oid( + NameOID.ORGANIZATIONAL_UNIT_NAME + ) + email_address = certificate_object.subject.get_attributes_for_oid(NameOID.EMAIL_ADDRESS) + sans_dns: List[str] = [] + sans_ip: List[str] = [] + sans_oid: List[str] = [] + try: + sans = certificate_object.extensions.get_extension_for_class( + x509.SubjectAlternativeName + ).value + for san in sans: + if isinstance(san, x509.DNSName): + sans_dns.append(san.value) + if isinstance(san, x509.IPAddress): + sans_ip.append(str(san.value)) + if isinstance(san, x509.RegisteredID): + sans_oid.append(str(san.value)) + except x509.ExtensionNotFound: + logger.debug("No SANs found in certificate") + sans_dns = [] + sans_ip = [] + sans_oid = [] + expiry_time = certificate_object.not_valid_after_utc + validity_start_time = certificate_object.not_valid_before_utc + is_ca = False + try: + is_ca = certificate_object.extensions.get_extension_for_oid( + ExtensionOID.BASIC_CONSTRAINTS + ).value.ca # type: ignore[reportAttributeAccessIssue] + except x509.ExtensionNotFound: + pass + + return cls( + raw=certificate.strip(), + common_name=str(common_name[0].value), + is_ca=is_ca, + country_name=str(country_name[0].value) if country_name else None, + state_or_province_name=str(state_or_province_name[0].value) + if state_or_province_name + else None, + locality_name=str(locality_name[0].value) if locality_name else None, + organization=str(organization_name[0].value) if organization_name else None, + organizational_unit=str(organizational_unit[0].value) if organizational_unit else None, + email_address=str(email_address[0].value) if email_address else None, + sans_dns=frozenset(sans_dns), + sans_ip=frozenset(sans_ip), + sans_oid=frozenset(sans_oid), + expiry_time=expiry_time, + validity_start_time=validity_start_time, + ) + + def matches_private_key(self, private_key: PrivateKey) -> bool: + """Check if this certificate matches a given private key. + + Args: + private_key (PrivateKey): The private key to validate against. + + Returns: + bool: True if the certificate matches the private key, False otherwise. + """ + try: + cert_object = x509.load_pem_x509_certificate(self.raw.encode()) + key_object = serialization.load_pem_private_key( + private_key.raw.encode(), password=None + ) + + cert_public_key = cert_object.public_key() + key_public_key = key_object.public_key() + + if not isinstance(cert_public_key, rsa.RSAPublicKey): + logger.warning("Certificate does not use RSA public key") + return False + + if not isinstance(key_public_key, rsa.RSAPublicKey): + logger.warning("Private key is not an RSA key") + return False + + return cert_public_key.public_numbers() == key_public_key.public_numbers() + except Exception as e: + logger.warning("Failed to validate certificate and private key match: %s", e) + return False + + +@dataclass(frozen=True) +class CertificateSigningRequest: + """This class represents a certificate signing request.""" + + raw: str + common_name: str + sans_dns: Optional[FrozenSet[str]] = None + sans_ip: Optional[FrozenSet[str]] = None + sans_oid: Optional[FrozenSet[str]] = None + email_address: Optional[str] = None + organization: Optional[str] = None + organizational_unit: Optional[str] = None + country_name: Optional[str] = None + state_or_province_name: Optional[str] = None + locality_name: Optional[str] = None + has_unique_identifier: bool = False + + def __eq__(self, other: object) -> bool: + """Check if two CertificateSigningRequest objects are equal.""" + if not isinstance(other, CertificateSigningRequest): + return NotImplemented + return self.raw.strip() == other.raw.strip() + + def __str__(self) -> str: + """Return the CSR as a string.""" + return self.raw + + @classmethod + def from_string(cls, csr: str) -> "CertificateSigningRequest": + """Create a CertificateSigningRequest object from a CSR.""" + try: + csr_object = x509.load_pem_x509_csr(csr.encode()) + except ValueError as e: + logger.error("Could not load CSR: %s", e) + raise TLSCertificatesError("Could not load CSR") + common_name = csr_object.subject.get_attributes_for_oid(NameOID.COMMON_NAME) + country_name = csr_object.subject.get_attributes_for_oid(NameOID.COUNTRY_NAME) + state_or_province_name = csr_object.subject.get_attributes_for_oid( + NameOID.STATE_OR_PROVINCE_NAME + ) + locality_name = csr_object.subject.get_attributes_for_oid(NameOID.LOCALITY_NAME) + organization_name = csr_object.subject.get_attributes_for_oid(NameOID.ORGANIZATION_NAME) + organizational_unit = csr_object.subject.get_attributes_for_oid( + NameOID.ORGANIZATIONAL_UNIT_NAME + ) + email_address = csr_object.subject.get_attributes_for_oid(NameOID.EMAIL_ADDRESS) + unique_identifier = csr_object.subject.get_attributes_for_oid( + NameOID.X500_UNIQUE_IDENTIFIER + ) + try: + sans = csr_object.extensions.get_extension_for_class(x509.SubjectAlternativeName).value + sans_dns = frozenset(sans.get_values_for_type(x509.DNSName)) + sans_ip = frozenset([str(san) for san in sans.get_values_for_type(x509.IPAddress)]) + sans_oid = frozenset( + [san.dotted_string for san in sans.get_values_for_type(x509.RegisteredID)] + ) + except x509.ExtensionNotFound: + sans = frozenset() + sans_dns = frozenset() + sans_ip = frozenset() + sans_oid = frozenset() + return cls( + raw=csr.strip(), + common_name=str(common_name[0].value), + country_name=str(country_name[0].value) if country_name else None, + state_or_province_name=str(state_or_province_name[0].value) + if state_or_province_name + else None, + locality_name=str(locality_name[0].value) if locality_name else None, + organization=str(organization_name[0].value) if organization_name else None, + organizational_unit=str(organizational_unit[0].value) if organizational_unit else None, + email_address=str(email_address[0].value) if email_address else None, + sans_dns=sans_dns, + sans_ip=sans_ip, + sans_oid=sans_oid, + has_unique_identifier=bool(unique_identifier), + ) + + def matches_private_key(self, key: PrivateKey) -> bool: + """Check if a CSR matches a private key. + + This function only works with RSA keys. + + Args: + key (PrivateKey): Private key + Returns: + bool: True/False depending on whether the CSR matches the private key. + """ + try: + csr_object = x509.load_pem_x509_csr(self.raw.encode("utf-8")) + key_object = serialization.load_pem_private_key( + data=key.raw.encode("utf-8"), password=None + ) + key_object_public_key = key_object.public_key() + csr_object_public_key = csr_object.public_key() + if not isinstance(key_object_public_key, rsa.RSAPublicKey): + logger.warning("Key is not an RSA key") + return False + if not isinstance(csr_object_public_key, rsa.RSAPublicKey): + logger.warning("CSR is not an RSA key") + return False + if ( + csr_object_public_key.public_numbers().n + != key_object_public_key.public_numbers().n + ): + logger.warning("Public key numbers between CSR and key do not match") + return False + except ValueError: + logger.warning("Could not load certificate or CSR.") + return False + return True + + def matches_certificate(self, certificate: Certificate) -> bool: + """Check if a CSR matches a certificate. + + Args: + certificate (Certificate): Certificate + Returns: + bool: True/False depending on whether the CSR matches the certificate. + """ + csr_object = x509.load_pem_x509_csr(self.raw.encode("utf-8")) + cert_object = x509.load_pem_x509_certificate(certificate.raw.encode("utf-8")) + return csr_object.public_key() == cert_object.public_key() + + def get_sha256_hex(self) -> str: + """Calculate the hash of the provided data and return the hexadecimal representation.""" + digest = hashes.Hash(hashes.SHA256()) + digest.update(self.raw.encode()) + return digest.finalize().hex() + + +@dataclass(frozen=True) +class CertificateRequestAttributes: + """A representation of the certificate request attributes. + + This class should be used inside the requirer charm to specify the requested + attributes for the certificate. + """ + + common_name: str + sans_dns: Optional[FrozenSet[str]] = frozenset() + sans_ip: Optional[FrozenSet[str]] = frozenset() + sans_oid: Optional[FrozenSet[str]] = frozenset() + email_address: Optional[str] = None + organization: Optional[str] = None + organizational_unit: Optional[str] = None + country_name: Optional[str] = None + state_or_province_name: Optional[str] = None + locality_name: Optional[str] = None + is_ca: bool = False + add_unique_id_to_subject_name: bool = True + + def is_valid(self) -> bool: + """Check whether the certificate request is valid.""" + if not self.common_name: + return False + return True + + def generate_csr( + self, + private_key: PrivateKey, + ) -> CertificateSigningRequest: + """Generate a CSR using private key and subject. + + Args: + private_key (PrivateKey): Private key + + Returns: + CertificateSigningRequest: CSR + """ + return generate_csr( + private_key=private_key, + common_name=self.common_name, + sans_dns=self.sans_dns, + sans_ip=self.sans_ip, + sans_oid=self.sans_oid, + email_address=self.email_address, + organization=self.organization, + organizational_unit=self.organizational_unit, + country_name=self.country_name, + state_or_province_name=self.state_or_province_name, + locality_name=self.locality_name, + add_unique_id_to_subject_name=self.add_unique_id_to_subject_name, + ) + + @classmethod + def from_csr(cls, csr: CertificateSigningRequest, is_ca: bool): + """Create a CertificateRequestAttributes object from a CSR.""" + return cls( + common_name=csr.common_name, + sans_dns=csr.sans_dns, + sans_ip=csr.sans_ip, + sans_oid=csr.sans_oid, + email_address=csr.email_address, + organization=csr.organization, + organizational_unit=csr.organizational_unit, + country_name=csr.country_name, + state_or_province_name=csr.state_or_province_name, + locality_name=csr.locality_name, + is_ca=is_ca, + add_unique_id_to_subject_name=csr.has_unique_identifier, + ) + + +@dataclass(frozen=True) +class ProviderCertificate: + """This class represents a certificate provided by the TLS provider.""" + + relation_id: int + certificate: Certificate + certificate_signing_request: CertificateSigningRequest + ca: Certificate + chain: List[Certificate] + revoked: Optional[bool] = None + + def to_json(self) -> str: + """Return the object as a JSON string. + + Returns: + str: JSON representation of the object + """ + return json.dumps( + { + "csr": str(self.certificate_signing_request), + "certificate": str(self.certificate), + "ca": str(self.ca), + "chain": [str(cert) for cert in self.chain], + "revoked": self.revoked, + } + ) + + +@dataclass(frozen=True) +class RequirerCertificateRequest: + """This class represents a certificate signing request requested by a specific TLS requirer.""" + + relation_id: int + certificate_signing_request: CertificateSigningRequest + is_ca: bool + + +class CertificateAvailableEvent(EventBase): + """Charm Event triggered when a TLS certificate is available.""" + + def __init__( + self, + handle: Handle, + certificate: Certificate, + certificate_signing_request: CertificateSigningRequest, + ca: Certificate, + chain: List[Certificate], + ): + super().__init__(handle) + self.certificate = certificate + self.certificate_signing_request = certificate_signing_request + self.ca = ca + self.chain = chain + + def snapshot(self) -> dict: + """Return snapshot.""" + return { + "certificate": str(self.certificate), + "certificate_signing_request": str(self.certificate_signing_request), + "ca": str(self.ca), + "chain": json.dumps([str(certificate) for certificate in self.chain]), + } + + def restore(self, snapshot: dict): + """Restore snapshot.""" + self.certificate = Certificate.from_string(snapshot["certificate"]) + self.certificate_signing_request = CertificateSigningRequest.from_string( + snapshot["certificate_signing_request"] + ) + self.ca = Certificate.from_string(snapshot["ca"]) + chain_strs = json.loads(snapshot["chain"]) + self.chain = [Certificate.from_string(chain_str) for chain_str in chain_strs] + + def chain_as_pem(self) -> str: + """Return full certificate chain as a PEM string.""" + return "\n\n".join([str(cert) for cert in self.chain]) + + +def generate_private_key( + key_size: int = 2048, + public_exponent: int = 65537, +) -> PrivateKey: + """Generate a private key with the RSA algorithm. + + Args: + key_size (int): Key size in bits, must be at least 2048 bits + public_exponent: Public exponent. + + Returns: + PrivateKey: Private Key + """ + if key_size < 2048: + raise ValueError("Key size must be at least 2048 bits for RSA security") + private_key = rsa.generate_private_key( + public_exponent=public_exponent, + key_size=key_size, + ) + key_bytes = private_key.private_bytes( + encoding=serialization.Encoding.PEM, + format=serialization.PrivateFormat.TraditionalOpenSSL, + encryption_algorithm=serialization.NoEncryption(), + ) + return PrivateKey.from_string(key_bytes.decode()) + + +def calculate_relative_datetime(target_time: datetime, fraction: float) -> datetime: + """Calculate a datetime that is a given percentage from now to a target time. + + Args: + target_time (datetime): The future datetime to interpolate towards. + fraction (float): Fraction of the interval from now to target_time (0.0-1.0). + 1.0 means return target_time, + 0.9 means return the time after 90% of the interval has passed, + and 0.0 means return now. + """ + if fraction <= 0.0 or fraction > 1.0: + raise ValueError("Invalid fraction. Must be between 0.0 and 1.0") + now = datetime.now(timezone.utc) + time_until_target = target_time - now + return now + time_until_target * fraction + + +def chain_has_valid_order(chain: List[str]) -> bool: + """Check if the chain has a valid order. + + Validates that each certificate in the chain is properly signed by the next certificate. + The chain should be ordered from leaf to root, where each certificate is signed by + the next one in the chain. + + Args: + chain (List[str]): List of certificates in PEM format, ordered from leaf to root + + Returns: + bool: True if the chain has a valid order, False otherwise. + """ + if len(chain) < 2: + return True + + try: + for i in range(len(chain) - 1): + cert = x509.load_pem_x509_certificate(chain[i].encode()) + issuer = x509.load_pem_x509_certificate(chain[i + 1].encode()) + cert.verify_directly_issued_by(issuer) + return True + except (ValueError, TypeError, InvalidSignature): + return False + + +def generate_csr( # noqa: C901 + private_key: PrivateKey, + common_name: str, + sans_dns: Optional[FrozenSet[str]] = frozenset(), + sans_ip: Optional[FrozenSet[str]] = frozenset(), + sans_oid: Optional[FrozenSet[str]] = frozenset(), + organization: Optional[str] = None, + organizational_unit: Optional[str] = None, + email_address: Optional[str] = None, + country_name: Optional[str] = None, + locality_name: Optional[str] = None, + state_or_province_name: Optional[str] = None, + add_unique_id_to_subject_name: bool = True, +) -> CertificateSigningRequest: + """Generate a CSR using private key and subject. + + Args: + private_key (PrivateKey): Private key + common_name (str): Common name + sans_dns (FrozenSet[str]): DNS Subject Alternative Names + sans_ip (FrozenSet[str]): IP Subject Alternative Names + sans_oid (FrozenSet[str]): OID Subject Alternative Names + organization (Optional[str]): Organization name + organizational_unit (Optional[str]): Organizational unit name + email_address (Optional[str]): Email address + country_name (Optional[str]): Country name + state_or_province_name (Optional[str]): State or province name + locality_name (Optional[str]): Locality name + add_unique_id_to_subject_name (bool): Whether a unique ID must be added to the CSR's + subject name. Always leave to "True" when the CSR is used to request certificates + using the tls-certificates relation. + + Returns: + CertificateSigningRequest: CSR + """ + signing_key = serialization.load_pem_private_key(str(private_key).encode(), password=None) + subject_name = [x509.NameAttribute(x509.NameOID.COMMON_NAME, common_name)] + if add_unique_id_to_subject_name: + unique_identifier = uuid.uuid4() + subject_name.append( + x509.NameAttribute(x509.NameOID.X500_UNIQUE_IDENTIFIER, str(unique_identifier)) + ) + if organization: + subject_name.append(x509.NameAttribute(x509.NameOID.ORGANIZATION_NAME, organization)) + if organizational_unit: + subject_name.append( + x509.NameAttribute(x509.NameOID.ORGANIZATIONAL_UNIT_NAME, organizational_unit) + ) + if email_address: + subject_name.append(x509.NameAttribute(x509.NameOID.EMAIL_ADDRESS, email_address)) + if country_name: + subject_name.append(x509.NameAttribute(x509.NameOID.COUNTRY_NAME, country_name)) + if state_or_province_name: + subject_name.append( + x509.NameAttribute(x509.NameOID.STATE_OR_PROVINCE_NAME, state_or_province_name) + ) + if locality_name: + subject_name.append(x509.NameAttribute(x509.NameOID.LOCALITY_NAME, locality_name)) + csr = x509.CertificateSigningRequestBuilder(subject_name=x509.Name(subject_name)) + + _sans: List[x509.GeneralName] = [] + if sans_oid: + _sans.extend([x509.RegisteredID(x509.ObjectIdentifier(san)) for san in sans_oid]) + if sans_ip: + _sans.extend([x509.IPAddress(ipaddress.ip_address(san)) for san in sans_ip]) + if sans_dns: + _sans.extend([x509.DNSName(san) for san in sans_dns]) + if _sans: + csr = csr.add_extension(x509.SubjectAlternativeName(set(_sans)), critical=False) + signed_certificate = csr.sign(signing_key, hashes.SHA256()) # type: ignore[arg-type] + csr_str = signed_certificate.public_bytes(serialization.Encoding.PEM).decode() + return CertificateSigningRequest.from_string(csr_str) + + +def generate_ca( + private_key: PrivateKey, + validity: timedelta, + common_name: str, + sans_dns: Optional[FrozenSet[str]] = frozenset(), + sans_ip: Optional[FrozenSet[str]] = frozenset(), + sans_oid: Optional[FrozenSet[str]] = frozenset(), + organization: Optional[str] = None, + organizational_unit: Optional[str] = None, + email_address: Optional[str] = None, + country_name: Optional[str] = None, + state_or_province_name: Optional[str] = None, + locality_name: Optional[str] = None, +) -> Certificate: + """Generate a self signed CA Certificate. + + Args: + private_key (PrivateKey): Private key + validity (timedelta): Certificate validity time + common_name (str): Common Name that can be an IP or a Full Qualified Domain Name (FQDN). + sans_dns (FrozenSet[str]): DNS Subject Alternative Names + sans_ip (FrozenSet[str]): IP Subject Alternative Names + sans_oid (FrozenSet[str]): OID Subject Alternative Names + organization (Optional[str]): Organization name + organizational_unit (Optional[str]): Organizational unit name + email_address (Optional[str]): Email address + country_name (str): Certificate Issuing country + state_or_province_name (str): Certificate Issuing state or province + locality_name (str): Certificate Issuing locality + + Returns: + Certificate: CA Certificate. + """ + private_key_object = serialization.load_pem_private_key( + str(private_key).encode(), password=None + ) + assert isinstance(private_key_object, rsa.RSAPrivateKey) + subject_name = [x509.NameAttribute(x509.NameOID.COMMON_NAME, common_name)] + if organization: + subject_name.append(x509.NameAttribute(x509.NameOID.ORGANIZATION_NAME, organization)) + if organizational_unit: + subject_name.append( + x509.NameAttribute(x509.NameOID.ORGANIZATIONAL_UNIT_NAME, organizational_unit) + ) + if email_address: + subject_name.append(x509.NameAttribute(x509.NameOID.EMAIL_ADDRESS, email_address)) + if country_name: + subject_name.append(x509.NameAttribute(x509.NameOID.COUNTRY_NAME, country_name)) + if state_or_province_name: + subject_name.append( + x509.NameAttribute(x509.NameOID.STATE_OR_PROVINCE_NAME, state_or_province_name) + ) + if locality_name: + subject_name.append(x509.NameAttribute(x509.NameOID.LOCALITY_NAME, locality_name)) + + subject_identifier_object = x509.SubjectKeyIdentifier.from_public_key( + private_key_object.public_key() + ) + subject_identifier = key_identifier = subject_identifier_object.public_bytes() + key_usage = x509.KeyUsage( + digital_signature=True, + key_encipherment=True, + key_cert_sign=True, + key_agreement=False, + content_commitment=False, + data_encipherment=False, + crl_sign=False, + encipher_only=False, + decipher_only=False, + ) + + builder = ( + x509.CertificateBuilder() + .subject_name(x509.Name(subject_name)) + .issuer_name(x509.Name(subject_name)) + .public_key(private_key_object.public_key()) + .serial_number(x509.random_serial_number()) + .not_valid_before(datetime.now(timezone.utc)) + .not_valid_after(datetime.now(timezone.utc) + validity) + .add_extension(x509.SubjectKeyIdentifier(digest=subject_identifier), critical=False) + .add_extension( + x509.AuthorityKeyIdentifier( + key_identifier=key_identifier, + authority_cert_issuer=None, + authority_cert_serial_number=None, + ), + critical=False, + ) + .add_extension(key_usage, critical=True) + .add_extension( + x509.BasicConstraints(ca=True, path_length=None), + critical=True, + ) + ) + san_extension = _san_extension( + email_address=email_address, + sans_dns=sans_dns, + sans_ip=sans_ip, + sans_oid=sans_oid, + ) + if san_extension: + builder = builder.add_extension(san_extension, critical=False) + cert = builder.sign(private_key_object, hashes.SHA256()) # type: ignore[arg-type] + ca_cert_str = cert.public_bytes(serialization.Encoding.PEM).decode().strip() + return Certificate.from_string(ca_cert_str) + + +def _san_extension( + email_address: Optional[str] = None, + sans_dns: Optional[FrozenSet[str]] = frozenset(), + sans_ip: Optional[FrozenSet[str]] = frozenset(), + sans_oid: Optional[FrozenSet[str]] = frozenset(), +) -> Optional[x509.SubjectAlternativeName]: + sans: List[x509.GeneralName] = [] + if email_address: + # If an e-mail address was provided, it should always be in the SAN + sans.append(x509.RFC822Name(email_address)) + if sans_dns: + sans.extend([x509.DNSName(san) for san in sans_dns]) + if sans_ip: + sans.extend([x509.IPAddress(ipaddress.ip_address(san)) for san in sans_ip]) + if sans_oid: + sans.extend([x509.RegisteredID(x509.ObjectIdentifier(san)) for san in sans_oid]) + if not sans: + return None + return x509.SubjectAlternativeName(sans) + + +def generate_certificate( + csr: CertificateSigningRequest, + ca: Certificate, + ca_private_key: PrivateKey, + validity: timedelta, + is_ca: bool = False, +) -> Certificate: + """Generate a TLS certificate based on a CSR. + + Args: + csr (CertificateSigningRequest): CSR + ca (Certificate): CA Certificate + ca_private_key (PrivateKey): CA private key + validity (timedelta): Certificate validity time + is_ca (bool): Whether the certificate is a CA certificate + + Returns: + Certificate: Certificate + """ + csr_object = x509.load_pem_x509_csr(str(csr).encode()) + subject = csr_object.subject + ca_pem = x509.load_pem_x509_certificate(str(ca).encode()) + issuer = ca_pem.issuer + private_key = serialization.load_pem_private_key(str(ca_private_key).encode(), password=None) + + certificate_builder = ( + x509.CertificateBuilder() + .subject_name(subject) + .issuer_name(issuer) + .public_key(csr_object.public_key()) + .serial_number(x509.random_serial_number()) + .not_valid_before(datetime.now(timezone.utc)) + .not_valid_after(datetime.now(timezone.utc) + validity) + ) + extensions = _generate_certificate_request_extensions( + authority_key_identifier=ca_pem.extensions.get_extension_for_class( + x509.SubjectKeyIdentifier + ).value.key_identifier, + csr=csr_object, + is_ca=is_ca, + ) + for extension in extensions: + try: + certificate_builder = certificate_builder.add_extension( + extval=extension.value, + critical=extension.critical, + ) + except ValueError as e: + logger.warning("Failed to add extension %s: %s", extension.oid, e) + + cert = certificate_builder.sign(private_key, hashes.SHA256()) # type: ignore[arg-type] + cert_bytes = cert.public_bytes(serialization.Encoding.PEM) + return Certificate.from_string(cert_bytes.decode().strip()) + + +def _generate_certificate_request_extensions( + authority_key_identifier: bytes, + csr: x509.CertificateSigningRequest, + is_ca: bool, +) -> List[x509.Extension]: + """Generate a list of certificate extensions from a CSR and other known information. + + Args: + authority_key_identifier (bytes): Authority key identifier + csr (x509.CertificateSigningRequest): CSR + is_ca (bool): Whether the certificate is a CA certificate + + Returns: + List[x509.Extension]: List of extensions + """ + cert_extensions_list: List[x509.Extension] = [ + x509.Extension( + oid=ExtensionOID.AUTHORITY_KEY_IDENTIFIER, + value=x509.AuthorityKeyIdentifier( + key_identifier=authority_key_identifier, + authority_cert_issuer=None, + authority_cert_serial_number=None, + ), + critical=False, + ), + x509.Extension( + oid=ExtensionOID.SUBJECT_KEY_IDENTIFIER, + value=x509.SubjectKeyIdentifier.from_public_key(csr.public_key()), + critical=False, + ), + x509.Extension( + oid=ExtensionOID.BASIC_CONSTRAINTS, + critical=True, + value=x509.BasicConstraints(ca=is_ca, path_length=None), + ), + ] + if sans := _generate_subject_alternative_name_extension(csr): + cert_extensions_list.append(sans) + + if is_ca: + cert_extensions_list.append( + x509.Extension( + ExtensionOID.KEY_USAGE, + critical=True, + value=x509.KeyUsage( + digital_signature=False, + content_commitment=False, + key_encipherment=False, + data_encipherment=False, + key_agreement=False, + key_cert_sign=True, + crl_sign=True, + encipher_only=False, + decipher_only=False, + ), + ) + ) + + existing_oids = {ext.oid for ext in cert_extensions_list} + for extension in csr.extensions: + if extension.oid == ExtensionOID.SUBJECT_ALTERNATIVE_NAME: + continue + if extension.oid in existing_oids: + logger.warning("Extension %s is managed by the TLS provider, ignoring.", extension.oid) + continue + cert_extensions_list.append(extension) + + return cert_extensions_list + + +def _generate_subject_alternative_name_extension( + csr: x509.CertificateSigningRequest, +) -> Optional[x509.Extension]: + sans: List[x509.GeneralName] = [] + try: + loaded_san_ext = csr.extensions.get_extension_for_class(x509.SubjectAlternativeName) + sans.extend( + [x509.DNSName(name) for name in loaded_san_ext.value.get_values_for_type(x509.DNSName)] + ) + sans.extend( + [x509.IPAddress(ip) for ip in loaded_san_ext.value.get_values_for_type(x509.IPAddress)] + ) + sans.extend( + [ + x509.RegisteredID(oid) + for oid in loaded_san_ext.value.get_values_for_type(x509.RegisteredID) + ] + ) + sans.extend( + [ + x509.RFC822Name(name) + for name in loaded_san_ext.value.get_values_for_type(x509.RFC822Name) + ] + ) + except x509.ExtensionNotFound: + pass + # If email is present in the CSR Subject, make sure it is also in the SANS + # to conform to RFC 5280. + email = csr.subject.get_attributes_for_oid(NameOID.EMAIL_ADDRESS) + if email: + email_rfc822 = x509.RFC822Name(str(email[0].value)) + if email_rfc822 not in sans: + sans.append(email_rfc822) + + return ( + x509.Extension( + oid=ExtensionOID.SUBJECT_ALTERNATIVE_NAME, + critical=False, + value=x509.SubjectAlternativeName(sans), + ) + if sans + else None + ) + + +class CertificatesRequirerCharmEvents(CharmEvents): + """List of events that the TLS Certificates requirer charm can leverage.""" + + certificate_available = EventSource(CertificateAvailableEvent) + + +class TLSCertificatesRequiresV4(Object): + """A class to manage the TLS certificates interface for a unit or app.""" + + on = CertificatesRequirerCharmEvents() # type: ignore[reportAssignmentType] + + def __init__( + self, + charm: CharmBase, + relationship_name: str, + certificate_requests: List[CertificateRequestAttributes], + mode: Mode = Mode.UNIT, + refresh_events: List[BoundEvent] = [], + private_key: Optional[PrivateKey] = None, + renewal_relative_time: float = 0.9, + ): + """Create a new instance of the TLSCertificatesRequiresV4 class. + + Args: + charm (CharmBase): The charm instance to relate to. + relationship_name (str): The name of the relation that provides the certificates. + certificate_requests (List[CertificateRequestAttributes]): + A list with the attributes of the certificate requests. + mode (Mode): Whether to use unit or app certificates mode. Default is Mode.UNIT. + In UNIT mode the requirer will place the csr in the unit relation data. + Each unit will manage its private key, + certificate signing request and certificate. + UNIT mode is for use cases where each unit has its own identity. + If you don't know which mode to use, you likely need UNIT. + In APP mode the leader unit will place the csr in the app relation databag. + APP mode is for use cases where the underlying application needs the certificate + for example using it as an intermediate CA to sign other certificates. + The certificate can only be accessed by the leader unit. + refresh_events (List[BoundEvent]): A list of events to trigger a refresh of + the certificates. + private_key (Optional[PrivateKey]): The private key to use for the certificates. + If provided, it will be used instead of generating a new one. + If the key is not valid an exception will be raised. + Using this parameter is discouraged, + having to pass around private keys manually can be a security concern. + Allowing the library to generate and manage the key is the more secure approach. + renewal_relative_time (float): The time to renew the certificate relative to its + expiry. + Default is 0.9, meaning 90% of the validity period. + The minimum value is 0.5, meaning 50% of the validity period. + If an invalid value is provided, an exception will be raised. + """ + super().__init__(charm, relationship_name) + if not JujuVersion.from_environ().has_secrets: + logger.warning("This version of the TLS library requires Juju secrets (Juju >= 3.0)") + if not self._mode_is_valid(mode): + raise TLSCertificatesError("Invalid mode. Must be Mode.UNIT or Mode.APP") + for certificate_request in certificate_requests: + if not certificate_request.is_valid(): + raise TLSCertificatesError("Invalid certificate request") + self.charm = charm + self.relationship_name = relationship_name + self.certificate_requests = certificate_requests + self.mode = mode + if private_key and not private_key.is_valid(): + raise TLSCertificatesError("Invalid private key") + if renewal_relative_time <= 0.5 or renewal_relative_time > 1.0: + raise TLSCertificatesError( + "Invalid renewal relative time. Must be between 0.0 and 1.0" + ) + self._private_key = private_key + self.renewal_relative_time = renewal_relative_time + self.framework.observe(charm.on[relationship_name].relation_created, self._configure) + self.framework.observe(charm.on[relationship_name].relation_changed, self._configure) + self.framework.observe(charm.on.secret_expired, self._on_secret_expired) + self.framework.observe(charm.on.secret_remove, self._on_secret_remove) + for event in refresh_events: + self.framework.observe(event, self._configure) + + def _configure(self, _: Optional[EventBase] = None): + """Handle TLS Certificates Relation Data. + + This method is called during any TLS relation event. + It will generate a private key if it doesn't exist yet. + It will send certificate requests if they haven't been sent yet. + It will find available certificates and emit events. + """ + if not self._tls_relation_created(): + logger.debug("TLS relation not created yet.") + return + self._ensure_private_key() + self._cleanup_certificate_requests() + self._send_certificate_requests() + self._find_available_certificates() + + def _mode_is_valid(self, mode: Mode) -> bool: + return mode in [Mode.UNIT, Mode.APP] + + def _validate_secret_exists(self, secret: Secret) -> None: + secret.get_info() # Will raise `SecretNotFoundError` if the secret does not exist + + def _on_secret_remove(self, event: SecretRemoveEvent) -> None: + """Handle Secret Removed Event.""" + try: + # Ensure the secret exists before trying to remove it, otherwise + # the unit could be stuck in an error state. See the docstring of + # `remove_revision` and the below issue for more information. + # https://github.com/juju/juju/issues/19036 + self._validate_secret_exists(event.secret) + event.secret.remove_revision(event.revision) + except SecretNotFoundError: + logger.warning( + "No such secret %s, nothing to remove", + event.secret.label or event.secret.id, + ) + return + + def _on_secret_expired(self, event: SecretExpiredEvent) -> None: + """Handle Secret Expired Event. + + Renews certificate requests and removes the expired secret. + """ + if not event.secret.label or not event.secret.label.startswith(f"{LIBID}-certificate"): + return + try: + csr_str = event.secret.get_content(refresh=True)["csr"] + except ModelError: + logger.error("Failed to get CSR from secret - Skipping") + return + csr = CertificateSigningRequest.from_string(csr_str) + self._renew_certificate_request(csr) + event.secret.remove_all_revisions() + + def sync(self) -> None: + """Sync TLS Certificates Relation Data. + + This method allows the requirer to sync the TLS certificates relation data + without waiting for the refresh events to be triggered. + """ + self._configure() + + def renew_certificate(self, certificate: ProviderCertificate) -> None: + """Request the renewal of the provided certificate.""" + certificate_signing_request = certificate.certificate_signing_request + secret_label = self._get_csr_secret_label(certificate_signing_request) + try: + secret = self.model.get_secret(label=secret_label) + except SecretNotFoundError: + logger.warning("No matching secret found - Skipping renewal") + return + current_csr = secret.get_content(refresh=True).get("csr", "") + if current_csr != str(certificate_signing_request): + logger.warning("No matching CSR found - Skipping renewal") + return + self._renew_certificate_request(certificate_signing_request) + secret.remove_all_revisions() + + def _renew_certificate_request(self, csr: CertificateSigningRequest): + """Remove existing CSR from relation data and create a new one.""" + self._remove_requirer_csr_from_relation_data(csr) + self._send_certificate_requests() + logger.info("Renewed certificate request") + + def _remove_requirer_csr_from_relation_data(self, csr: CertificateSigningRequest) -> None: + relation = self.model.get_relation(self.relationship_name) + if not relation: + logger.debug("No relation: %s", self.relationship_name) + return + if not self.get_csrs_from_requirer_relation_data(): + logger.info("No CSRs in relation data - Doing nothing") + return + app_or_unit = self._get_app_or_unit() + try: + requirer_relation_data = _RequirerData.load(relation.data[app_or_unit]) + except DataValidationError: + logger.warning("Invalid relation data - Skipping removal of CSR") + return + new_relation_data = copy.deepcopy(requirer_relation_data.certificate_signing_requests) + for requirer_csr in new_relation_data: + if requirer_csr.certificate_signing_request.strip() == str(csr).strip(): + new_relation_data.remove(requirer_csr) + try: + _RequirerData(certificate_signing_requests=new_relation_data).dump( + relation.data[app_or_unit] + ) + logger.info("Removed CSR from relation data") + except ModelError: + logger.warning("Failed to update relation data") + + def _get_app_or_unit(self) -> Union[Application, Unit]: + """Return the unit or app object based on the mode.""" + if self.mode == Mode.UNIT: + return self.model.unit + elif self.mode == Mode.APP: + return self.model.app + raise TLSCertificatesError("Invalid mode") + + @property + def private_key(self) -> Optional[PrivateKey]: + """Return the private key.""" + if self._private_key: + return self._private_key + if not self._private_key_generated(): + return None + secret = self.charm.model.get_secret(label=self._get_private_key_secret_label()) + private_key = secret.get_content(refresh=True)["private-key"] + return PrivateKey.from_string(private_key) + + def _ensure_private_key(self) -> None: + """Make sure there is a private key to be used. + + It will make sure there is a private key passed by the charm using the private_key + parameter or generate a new one otherwise. + """ + # Remove the generated private key + # if one has been passed by the charm using the private_key parameter + if self._private_key: + self._remove_private_key_secret() + return + if self._private_key_generated(): + logger.debug("Private key already generated") + return + self._generate_private_key() + + def regenerate_private_key(self) -> None: + """Regenerate the private key. + + Generate a new private key, remove old certificate requests and send new ones. + + Raises: + TLSCertificatesError: If the private key is passed by the charm using the + private_key parameter. + """ + if self._private_key: + raise TLSCertificatesError( + "Private key is passed by the charm through the private_key parameter, " + "this function can't be used" + ) + if not self._private_key_generated(): + logger.warning("No private key to regenerate") + return + self._generate_private_key() + self._cleanup_certificate_requests() + self._send_certificate_requests() + + def _generate_private_key(self) -> None: + """Generate a new private key and store it in a secret. + + This is the case when the private key used is generated by the library. + and not passed by the charm using the private_key parameter. + """ + self._store_private_key_in_secret(generate_private_key()) + logger.info("Private key generated") + + def _private_key_generated(self) -> bool: + """Check if a private key is stored in a secret. + + This is the case when the private key used is generated by the library. + This should not exist when the private key used + is passed by the charm using the private_key parameter. + """ + try: + secret = self.charm.model.get_secret(label=self._get_private_key_secret_label()) + secret.get_content(refresh=True) + return True + except SecretNotFoundError: + return False + + def _store_private_key_in_secret(self, private_key: PrivateKey) -> None: + try: + secret = self.charm.model.get_secret(label=self._get_private_key_secret_label()) + secret.set_content({"private-key": str(private_key)}) + secret.get_content(refresh=True) + except SecretNotFoundError: + self.charm.unit.add_secret( + content={"private-key": str(private_key)}, + label=self._get_private_key_secret_label(), + ) + + def _remove_private_key_secret(self) -> None: + """Remove the private key secret.""" + try: + secret = self.charm.model.get_secret(label=self._get_private_key_secret_label()) + secret.remove_all_revisions() + except SecretNotFoundError: + logger.warning("Private key secret not found, nothing to remove") + + def _csr_matches_certificate_request( + self, certificate_signing_request: CertificateSigningRequest, is_ca: bool + ) -> bool: + for certificate_request in self.certificate_requests: + if certificate_request == CertificateRequestAttributes.from_csr( + certificate_signing_request, + is_ca, + ): + return True + return False + + def _certificate_requested(self, certificate_request: CertificateRequestAttributes) -> bool: + if not self.private_key: + return False + csr = self._certificate_requested_for_attributes(certificate_request) + if not csr: + return False + if not csr.certificate_signing_request.matches_private_key(key=self.private_key): + return False + return True + + def _certificate_requested_for_attributes( + self, + certificate_request: CertificateRequestAttributes, + ) -> Optional[RequirerCertificateRequest]: + for requirer_csr in self.get_csrs_from_requirer_relation_data(): + if certificate_request == CertificateRequestAttributes.from_csr( + requirer_csr.certificate_signing_request, + requirer_csr.is_ca, + ): + return requirer_csr + return None + + def get_csrs_from_requirer_relation_data(self) -> List[RequirerCertificateRequest]: + """Return list of requirer's CSRs from relation data.""" + if self.mode == Mode.APP and not self.model.unit.is_leader(): + logger.debug("Not a leader unit - Skipping") + return [] + relation = self.model.get_relation(self.relationship_name) + if not relation: + logger.debug("No relation: %s", self.relationship_name) + return [] + app_or_unit = self._get_app_or_unit() + try: + requirer_relation_data = _RequirerData.load(relation.data[app_or_unit]) + except DataValidationError: + logger.warning("Invalid relation data") + return [] + requirer_csrs = [] + for csr in requirer_relation_data.certificate_signing_requests: + requirer_csrs.append( + RequirerCertificateRequest( + relation_id=relation.id, + certificate_signing_request=CertificateSigningRequest.from_string( + csr.certificate_signing_request + ), + is_ca=csr.ca if csr.ca else False, + ) + ) + return requirer_csrs + + def get_provider_certificates(self) -> List[ProviderCertificate]: + """Return list of certificates from the provider's relation data.""" + return self._load_provider_certificates() + + def _load_provider_certificates(self) -> List[ProviderCertificate]: + relation = self.model.get_relation(self.relationship_name) + if not relation: + logger.debug("No relation: %s", self.relationship_name) + return [] + if not relation.app: + logger.debug("No remote app in relation: %s", self.relationship_name) + return [] + try: + provider_relation_data = _ProviderApplicationData.load(relation.data[relation.app]) + except DataValidationError: + logger.warning("Invalid relation data") + return [] + return [ + certificate.to_provider_certificate(relation_id=relation.id) + for certificate in provider_relation_data.certificates + ] + + def _request_certificate(self, csr: CertificateSigningRequest, is_ca: bool) -> None: + """Add CSR to relation data.""" + if self.mode == Mode.APP and not self.model.unit.is_leader(): + logger.debug("Not a leader unit - Skipping") + return + relation = self.model.get_relation(self.relationship_name) + if not relation: + logger.debug("No relation: %s", self.relationship_name) + return + new_csr = _CertificateSigningRequest( + certificate_signing_request=str(csr).strip(), ca=is_ca + ) + app_or_unit = self._get_app_or_unit() + try: + requirer_relation_data = _RequirerData.load(relation.data[app_or_unit]) + except DataValidationError: + requirer_relation_data = _RequirerData( + certificate_signing_requests=[], + ) + new_relation_data = copy.deepcopy(requirer_relation_data.certificate_signing_requests) + new_relation_data.append(new_csr) + try: + _RequirerData(certificate_signing_requests=new_relation_data).dump( + relation.data[app_or_unit] + ) + logger.info("Certificate signing request added to relation data.") + except ModelError: + logger.warning("Failed to update relation data") + + def _send_certificate_requests(self): + if not self.private_key: + logger.debug("Private key not generated yet.") + return + for certificate_request in self.certificate_requests: + if not self._certificate_requested(certificate_request): + csr = certificate_request.generate_csr( + private_key=self.private_key, + ) + if not csr: + logger.warning("Failed to generate CSR") + continue + self._request_certificate(csr=csr, is_ca=certificate_request.is_ca) + + def get_assigned_certificate( + self, certificate_request: CertificateRequestAttributes + ) -> Tuple[Optional[ProviderCertificate], Optional[PrivateKey]]: + """Get the certificate that was assigned to the given certificate request.""" + for requirer_csr in self.get_csrs_from_requirer_relation_data(): + if certificate_request == CertificateRequestAttributes.from_csr( + requirer_csr.certificate_signing_request, + requirer_csr.is_ca, + ): + return self._find_certificate_in_relation_data(requirer_csr), self.private_key + return None, None + + def get_assigned_certificates( + self, + ) -> Tuple[List[ProviderCertificate], Optional[PrivateKey]]: + """Get a list of certificates that were assigned to this or app.""" + assigned_certificates = [] + for requirer_csr in self.get_csrs_from_requirer_relation_data(): + if cert := self._find_certificate_in_relation_data(requirer_csr): + assigned_certificates.append(cert) + return assigned_certificates, self.private_key + + def _find_certificate_in_relation_data( + self, csr: RequirerCertificateRequest + ) -> Optional[ProviderCertificate]: + """Return the certificate that matches the given CSR, validated against the private key.""" + if not self.private_key: + return None + for provider_certificate in self.get_provider_certificates(): + if provider_certificate.certificate_signing_request == csr.certificate_signing_request: + if provider_certificate.certificate.is_ca and not csr.is_ca: + logger.warning("Non CA certificate requested, got a CA certificate, ignoring") + continue + elif not provider_certificate.certificate.is_ca and csr.is_ca: + logger.warning("CA certificate requested, got a non CA certificate, ignoring") + continue + if not provider_certificate.certificate.matches_private_key(self.private_key): + logger.warning( + "Certificate does not match the private key. Ignoring invalid certificate." + ) + continue + return provider_certificate + return None + + def _find_available_certificates(self): + """Find available certificates and emit events. + + This method will find certificates that are available for the requirer's CSRs. + If a certificate is found, it will be set as a secret and an event will be emitted. + If a certificate is revoked, the secret will be removed and an event will be emitted. + """ + requirer_csrs = self.get_csrs_from_requirer_relation_data() + csrs = [csr.certificate_signing_request for csr in requirer_csrs] + provider_certificates = self.get_provider_certificates() + for provider_certificate in provider_certificates: + if provider_certificate.certificate_signing_request in csrs: + secret_label = self._get_csr_secret_label( + provider_certificate.certificate_signing_request + ) + if provider_certificate.revoked: + with suppress(SecretNotFoundError): + logger.debug( + "Removing secret with label %s", + secret_label, + ) + secret = self.model.get_secret(label=secret_label) + secret.remove_all_revisions() + else: + if not self._csr_matches_certificate_request( + certificate_signing_request=provider_certificate.certificate_signing_request, + is_ca=provider_certificate.certificate.is_ca, + ): + logger.debug("Certificate requested for different attributes - Skipping") + continue + try: + secret = self.model.get_secret(label=secret_label) + logger.debug("Setting secret with label %s", secret_label) + # Juju < 3.6 will create a new revision even if the content is the same + if secret.get_content(refresh=True).get("certificate", "") == str( + provider_certificate.certificate + ): + logger.debug( + "Secret %s with correct certificate already exists", secret_label + ) + continue + secret.set_content( + content={ + "certificate": str(provider_certificate.certificate), + "csr": str(provider_certificate.certificate_signing_request), + } + ) + secret.set_info( + expire=provider_certificate.certificate.expiry_time, + ) + secret.get_content(refresh=True) + except SecretNotFoundError: + logger.debug("Creating new secret with label %s", secret_label) + secret = self.charm.unit.add_secret( + content={ + "certificate": str(provider_certificate.certificate), + "csr": str(provider_certificate.certificate_signing_request), + }, + label=secret_label, + expire=calculate_relative_datetime( + target_time=provider_certificate.certificate.expiry_time, + fraction=self.renewal_relative_time, + ), + ) + self.on.certificate_available.emit( + certificate_signing_request=provider_certificate.certificate_signing_request, + certificate=provider_certificate.certificate, + ca=provider_certificate.ca, + chain=provider_certificate.chain, + ) + + def _cleanup_certificate_requests(self): + """Clean up certificate requests. + + Remove any certificate requests that falls into one of the following categories: + - The CSR attributes do not match any of the certificate requests defined in + the charm's certificate_requests attribute. + - The CSR public key does not match the private key. + """ + for requirer_csr in self.get_csrs_from_requirer_relation_data(): + if not self._csr_matches_certificate_request( + certificate_signing_request=requirer_csr.certificate_signing_request, + is_ca=requirer_csr.is_ca, + ): + self._remove_requirer_csr_from_relation_data( + requirer_csr.certificate_signing_request + ) + logger.info( + "Removed CSR from relation data because it did not match any certificate request" # noqa: E501 + ) + elif ( + self.private_key + and not requirer_csr.certificate_signing_request.matches_private_key( + self.private_key + ) + ): + self._remove_requirer_csr_from_relation_data( + requirer_csr.certificate_signing_request + ) + logger.info( + "Removed CSR from relation data because it did not match the private key" # noqa: E501 + ) + + def _tls_relation_created(self) -> bool: + relation = self.model.get_relation(self.relationship_name) + if not relation: + return False + return True + + def _get_private_key_secret_label(self) -> str: + if self.mode == Mode.UNIT: + return f"{LIBID}-private-key-{self._get_unit_number()}-{self.relationship_name}" + elif self.mode == Mode.APP: + return f"{LIBID}-private-key-{self.relationship_name}" + else: + raise TLSCertificatesError("Invalid mode. Must be Mode.UNIT or Mode.APP.") + + def _get_csr_secret_label(self, csr: CertificateSigningRequest) -> str: + csr_in_sha256_hex = csr.get_sha256_hex() + if self.mode == Mode.UNIT: + return f"{LIBID}-certificate-{self._get_unit_number()}-{csr_in_sha256_hex}" + elif self.mode == Mode.APP: + return f"{LIBID}-certificate-{csr_in_sha256_hex}" + else: + raise TLSCertificatesError("Invalid mode. Must be Mode.UNIT or Mode.APP.") + + def _get_unit_number(self) -> str: + return self.model.unit.name.split("/")[1] + + +class TLSCertificatesProvidesV4(Object): + """TLS certificates provider class to be instantiated by TLS certificates providers.""" + + def __init__(self, charm: CharmBase, relationship_name: str): + super().__init__(charm, relationship_name) + self.framework.observe(charm.on[relationship_name].relation_joined, self._configure) + self.framework.observe(charm.on[relationship_name].relation_changed, self._configure) + self.framework.observe(charm.on.update_status, self._configure) + self.charm = charm + self.relationship_name = relationship_name + + def _configure(self, _: EventBase) -> None: + """Handle update status and tls relation changed events. + + This is a common hook triggered on a regular basis. + + Revoke certificates for which no csr exists + """ + if not self.model.unit.is_leader(): + return + self._remove_certificates_for_which_no_csr_exists() + + def _remove_certificates_for_which_no_csr_exists(self) -> None: + provider_certificates = self.get_provider_certificates() + requirer_csrs = [ + request.certificate_signing_request for request in self.get_certificate_requests() + ] + for provider_certificate in provider_certificates: + if provider_certificate.certificate_signing_request not in requirer_csrs: + tls_relation = self._get_tls_relations( + relation_id=provider_certificate.relation_id + ) + self._remove_provider_certificate( + certificate=provider_certificate.certificate, + relation=tls_relation[0], + ) + + def _get_tls_relations(self, relation_id: Optional[int] = None) -> List[Relation]: + return ( + [ + relation + for relation in self.model.relations[self.relationship_name] + if relation.id == relation_id + ] + if relation_id is not None + else self.model.relations.get(self.relationship_name, []) + ) + + def get_certificate_requests( + self, relation_id: Optional[int] = None + ) -> List[RequirerCertificateRequest]: + """Load certificate requests from the relation data.""" + relations = self._get_tls_relations(relation_id) + requirer_csrs: List[RequirerCertificateRequest] = [] + for relation in relations: + for unit in relation.units: + requirer_csrs.extend(self._load_requirer_databag(relation, unit)) + requirer_csrs.extend(self._load_requirer_databag(relation, relation.app)) + return requirer_csrs + + def _load_requirer_databag( + self, relation: Relation, unit_or_app: Union[Application, Unit] + ) -> List[RequirerCertificateRequest]: + try: + requirer_relation_data = _RequirerData.load(relation.data.get(unit_or_app, {})) + except DataValidationError: + logger.debug("Invalid requirer relation data for %s", unit_or_app.name) + return [] + return [ + RequirerCertificateRequest( + relation_id=relation.id, + certificate_signing_request=CertificateSigningRequest.from_string( + csr.certificate_signing_request + ), + is_ca=csr.ca if csr.ca else False, + ) + for csr in requirer_relation_data.certificate_signing_requests + ] + + def _add_provider_certificate( + self, + relation: Relation, + provider_certificate: ProviderCertificate, + ) -> None: + chain = [str(certificate) for certificate in provider_certificate.chain] + if chain[0] != str(provider_certificate.certificate): + logger.warning( + "The order of the chain from the TLS Certificates Provider is incorrect. " + "The leaf certificate should be the first element of the chain." + ) + elif not chain_has_valid_order(chain): + logger.warning( + "The order of the chain from the TLS Certificates Provider is partially incorrect." + ) + new_certificate = _Certificate( + certificate=str(provider_certificate.certificate), + certificate_signing_request=str(provider_certificate.certificate_signing_request), + ca=str(provider_certificate.ca), + chain=chain, + ) + provider_certificates = self._load_provider_certificates(relation) + if new_certificate in provider_certificates: + logger.info("Certificate already in relation data - Doing nothing") + return + provider_certificates.append(new_certificate) + self._dump_provider_certificates(relation=relation, certificates=provider_certificates) + + def _load_provider_certificates(self, relation: Relation) -> List[_Certificate]: + try: + provider_relation_data = _ProviderApplicationData.load(relation.data[self.charm.app]) + except DataValidationError: + logger.debug("Invalid provider relation data") + return [] + return copy.deepcopy(provider_relation_data.certificates) + + def _dump_provider_certificates(self, relation: Relation, certificates: List[_Certificate]): + try: + _ProviderApplicationData(certificates=certificates).dump(relation.data[self.model.app]) + logger.info("Certificate relation data updated") + except ModelError: + logger.warning("Failed to update relation data") + + def _remove_provider_certificate( + self, + relation: Relation, + certificate: Optional[Certificate] = None, + certificate_signing_request: Optional[CertificateSigningRequest] = None, + ) -> None: + """Remove certificate based on certificate or certificate signing request.""" + provider_certificates = self._load_provider_certificates(relation) + for provider_certificate in provider_certificates: + if certificate and provider_certificate.certificate == str(certificate): + provider_certificates.remove(provider_certificate) + if ( + certificate_signing_request + and provider_certificate.certificate_signing_request + == str(certificate_signing_request) + ): + provider_certificates.remove(provider_certificate) + self._dump_provider_certificates(relation=relation, certificates=provider_certificates) + + def revoke_all_certificates(self) -> None: + """Revoke all certificates of this provider. + + This method is meant to be used when the Root CA has changed. + """ + if not self.model.unit.is_leader(): + logger.warning("Unit is not a leader - will not set relation data") + return + relations = self._get_tls_relations() + for relation in relations: + provider_certificates = self._load_provider_certificates(relation) + for certificate in provider_certificates: + certificate.revoked = True + self._dump_provider_certificates(relation=relation, certificates=provider_certificates) + + def set_relation_certificate( + self, + provider_certificate: ProviderCertificate, + ) -> None: + """Add certificates to relation data. + + Args: + provider_certificate (ProviderCertificate): ProviderCertificate object + + Returns: + None + """ + if not self.model.unit.is_leader(): + logger.warning("Unit is not a leader - will not set relation data") + return + certificates_relation = self.model.get_relation( + relation_name=self.relationship_name, relation_id=provider_certificate.relation_id + ) + if not certificates_relation: + raise TLSCertificatesError(f"Relation {self.relationship_name} does not exist") + self._remove_provider_certificate( + relation=certificates_relation, + certificate_signing_request=provider_certificate.certificate_signing_request, + ) + self._add_provider_certificate( + relation=certificates_relation, + provider_certificate=provider_certificate, + ) + + def get_issued_certificates( + self, relation_id: Optional[int] = None + ) -> List[ProviderCertificate]: + """Return a List of issued (non revoked) certificates. + + Returns: + List: List of ProviderCertificate objects + """ + if not self.model.unit.is_leader(): + logger.warning("Unit is not a leader - will not read relation data") + return [] + provider_certificates = self.get_provider_certificates(relation_id=relation_id) + return [certificate for certificate in provider_certificates if not certificate.revoked] + + def get_provider_certificates( + self, relation_id: Optional[int] = None + ) -> List[ProviderCertificate]: + """Return a List of issued certificates.""" + certificates: List[ProviderCertificate] = [] + relations = self._get_tls_relations(relation_id) + for relation in relations: + if not relation.app: + logger.warning("Relation %s does not have an application", relation.id) + continue + for certificate in self._load_provider_certificates(relation): + certificates.append(certificate.to_provider_certificate(relation_id=relation.id)) + return certificates + + def get_unsolicited_certificates( + self, relation_id: Optional[int] = None + ) -> List[ProviderCertificate]: + """Return provider certificates for which no certificate requests exists. + + Those certificates should be revoked. + """ + unsolicited_certificates: List[ProviderCertificate] = [] + provider_certificates = self.get_provider_certificates(relation_id=relation_id) + requirer_csrs = self.get_certificate_requests(relation_id=relation_id) + list_of_csrs = [csr.certificate_signing_request for csr in requirer_csrs] + for certificate in provider_certificates: + if certificate.certificate_signing_request not in list_of_csrs: + unsolicited_certificates.append(certificate) + return unsolicited_certificates + + def get_outstanding_certificate_requests( + self, relation_id: Optional[int] = None + ) -> List[RequirerCertificateRequest]: + """Return CSR's for which no certificate has been issued. + + Args: + relation_id (int): Relation id + + Returns: + list: List of RequirerCertificateRequest objects. + """ + requirer_csrs = self.get_certificate_requests(relation_id=relation_id) + outstanding_csrs: List[RequirerCertificateRequest] = [] + for relation_csr in requirer_csrs: + if not self._certificate_issued_for_csr( + csr=relation_csr.certificate_signing_request, + relation_id=relation_id, + ): + outstanding_csrs.append(relation_csr) + return outstanding_csrs + + def _certificate_issued_for_csr( + self, csr: CertificateSigningRequest, relation_id: Optional[int] + ) -> bool: + """Check whether a certificate has been issued for a given CSR.""" + issued_certificates_per_csr = self.get_issued_certificates(relation_id=relation_id) + for issued_certificate in issued_certificates_per_csr: + if issued_certificate.certificate_signing_request == csr: + return csr.matches_certificate(issued_certificate.certificate) + return False diff --git a/backend/pyproject.toml b/backend/pyproject.toml index c8580d2..64b2957 100644 --- a/backend/pyproject.toml +++ b/backend/pyproject.toml @@ -9,7 +9,8 @@ dependencies = [ "ops", # for the reconciler "cosl", - "litmus-libs", + "cryptography", + "litmus-libs>=0.0.4", ] [project.optional-dependencies] diff --git a/backend/src/charm.py b/backend/src/charm.py index dbff37b..aebe79c 100755 --- a/backend/src/charm.py +++ b/backend/src/charm.py @@ -4,14 +4,24 @@ """Charmed Operator for Litmus Backend server; the backend layer for a chaos testing platform.""" import logging +import socket from ops.charm import CharmBase +from charms.tls_certificates_interface.v4.tls_certificates import ( + TLSCertificatesRequiresV4, + CertificateRequestAttributes, +) from litmus_backend import LitmusBackend from ops import ActiveStatus, CollectStatusEvent, BlockedStatus from litmus_libs.interfaces.litmus_auth import LitmusAuthRequirer, Endpoint -from litmus_libs import DatabaseConfig, get_app_hostname +from litmus_libs import ( + DatabaseConfig, + TLSConfigData, + TlsReconciler, + get_app_hostname, +) from cosl.reconciler import all_events, observe_events from ops import WaitingStatus @@ -25,6 +35,11 @@ DATABASE_ENDPOINT = "database" LITMUS_AUTH_ENDPOINT = "litmus-auth" +TLS_CERTIFICATES_ENDPOINT = "tls-certificates" +# TODO: Put cert paths in the tls_reconciler module in litmus-libs +TLS_CERT_PATH = "/etc/tls/tls.crt" +TLS_KEY_PATH = "/etc/tls/tls.key" +TLS_CA_PATH = "/usr/local/share/ca-certificates/ca.crt" logger = logging.getLogger(__name__) @@ -34,8 +49,6 @@ class LitmusBackendCharm(CharmBase): def __init__(self, *args): super().__init__(*args) - self.unit.set_ports(LitmusBackend.http_port, LitmusBackend.grpc_port) - self._database = DatabaseRequires( self, relation_name=DATABASE_ENDPOINT, @@ -49,14 +62,30 @@ def __init__(self, *args): self.model.get_relation(LITMUS_AUTH_ENDPOINT), self.app, ) + self._tls_certificates = TLSCertificatesRequiresV4( + charm=self, + relationship_name=TLS_CERTIFICATES_ENDPOINT, + certificate_requests=[self._certificate_request_attributes], + ) self._send_http_api = LitmusBackendApiProvider( self.model.get_relation("http-api"), app=self.app ) + self._tls = TlsReconciler( + container=self.unit.get_container(LitmusBackend.name), + tls_cert_path=TLS_CERT_PATH, + tls_key_path=TLS_KEY_PATH, + tls_ca_path=TLS_CA_PATH, + tls_config_getter=lambda: self._tls_config, + ) self.litmus_backend = LitmusBackend( container=self.unit.get_container(LitmusBackend.name), db_config=self.database_config, + tls_config_getter=lambda: self._tls_config, + tls_cert_path=TLS_CERT_PATH, + tls_key_path=TLS_KEY_PATH, + tls_ca_path=TLS_CA_PATH, auth_grpc_endpoint=self.auth_grpc_endpoint, frontend_url=self.frontend_url, ) @@ -127,26 +156,77 @@ def _on_collect_unit_status(self, e: CollectStatusEvent): ################### # UTILITY METHODS # ################### + @property + def _tls_config(self) -> Optional[TLSConfigData]: + """Returns the TLS configuration, including certificates and private key, if available; None otherwise.""" + certificates, private_key = self._tls_certificates.get_assigned_certificate( + self._certificate_request_attributes + ) + if not (certificates and private_key): + return None + return TLSConfigData( + server_cert=certificates.certificate.raw, + private_key=private_key.raw, + ca_cert=certificates.ca.raw, + ) + @property def _http_api_endpoint(self): """Internal (i.e. not ingressed) url.""" - # TODO: add support for HTTPS once https://github.com/canonical/litmus-operators/issues/23 is fixed - return f"http://{get_app_hostname(self.app.name, self.model.name)}:{self.litmus_backend.http_port}" + return f"{self._http_api_protocol}://{get_app_hostname(self.app.name, self.model.name)}:{self._http_api_port}" + + @property + def _certificate_request_attributes(self) -> CertificateRequestAttributes: + return CertificateRequestAttributes( + common_name=self.app.name, + sans_dns=frozenset( + ( + socket.getfqdn(), + get_app_hostname(self.app.name, self.model.name), + ) + ), + ) def _reconcile(self): """Run all logic that is independent of what event we're processing.""" + self._tls_certificates.sync() + self._tls.reconcile() self.litmus_backend.reconcile() + self.unit.set_ports(*self.litmus_backend.litmus_backend_ports) if self.unit.is_leader(): self._auth.publish_endpoint( Endpoint( grpc_server_host=get_app_hostname(self.app.name, self.model.name), - grpc_server_port=LitmusBackend.grpc_port, - # TODO: check if TLS is enabled once https://github.com/canonical/litmus-operators/issues/23 is fixed - insecure=True, + grpc_server_port=self._grpc_port, + insecure=False if self._tls_ready else True, ) ) self._send_http_api.publish_endpoint(self._http_api_endpoint) + @property + def _tls_ready(self) -> bool: + return bool(self._tls_config) + + @property + def _http_api_protocol(self): + return "https" if self._tls_ready else "http" + + @property + def _http_api_port(self): + return ( + self.litmus_backend.https_port + if self._tls_ready + else self.litmus_backend.http_port + ) + + @property + def _grpc_port(self): + return ( + self.litmus_backend.grpc_tls_port + if self._tls_ready + else self.litmus_backend.grpc_port + ) + if __name__ == "__main__": # pragma: nocover from ops import main diff --git a/backend/src/litmus_backend.py b/backend/src/litmus_backend.py index 2cbdf2a..eb95bb6 100644 --- a/backend/src/litmus_backend.py +++ b/backend/src/litmus_backend.py @@ -8,11 +8,10 @@ from ops import Container from ops.pebble import Layer -from typing import Optional -from litmus_libs import DatabaseConfig +from typing import Optional, Callable +from litmus_libs import DatabaseConfig, TLSConfigData from litmus_libs.interfaces.litmus_auth import Endpoint - logger = logging.getLogger(__name__) @@ -21,17 +20,27 @@ class LitmusBackend: name = "backend" http_port = 8080 + https_port = 8081 grpc_port = 8000 + grpc_tls_port = 8001 def __init__( self, container: Container, + tls_cert_path: str, + tls_key_path: str, + tls_ca_path: str, db_config: Optional[DatabaseConfig], + tls_config_getter: Callable[[], Optional[TLSConfigData]], auth_grpc_endpoint: Optional[Endpoint], frontend_url: Optional[str], ): self._container = container + self._tls_cert_path = tls_cert_path + self._tls_key_path = tls_key_path + self._tls_ca_path = tls_ca_path self._db_config = db_config + self.tls_config_getter = tls_config_getter self._auth_grpc_endpoint = auth_grpc_endpoint self._frontend_url = frontend_url @@ -51,6 +60,22 @@ def _reconcile_workload_config(self): @property def _pebble_layer(self) -> Layer: """Return a Pebble layer for Litmus backend server.""" + return Layer( + { + "services": { + self.name: { + "override": "replace", + "summary": "litmus backend server layer", + "command": "/bin/server", + "startup": "enabled", + "environment": self._environment_vars, + } + }, + } + ) + + @property + def _environment_vars(self) -> dict: env = { "REST_PORT": self.http_port, "GRPC_PORT": self.grpc_port, @@ -72,6 +97,7 @@ def _pebble_layer(self) -> Layer: "LITMUS_CHAOS_RUNNER_IMAGE": "litmuschaos/chaos-runner:3.20.0", "LITMUS_CHAOS_EXPORTER_IMAGE": "litmuschaos/chaos-exporter:3.20.0", } + if db_config := self._db_config: env.update( { @@ -87,24 +113,28 @@ def _pebble_layer(self) -> Layer: "LITMUS_AUTH_GRPC_PORT": auth_endpoint.grpc_server_port, } ) - if frontend_url := self._frontend_url: env.update( { "CHAOS_CENTER_UI_ENDPOINT": frontend_url, } ) + if self.tls_config_getter(): + env.update( + { + "ENABLE_INTERNAL_TLS": "true", + "REST_PORT": self.https_port, + "GRPC_PORT": self.grpc_tls_port, + "TLS_CERT_PATH": self._tls_cert_path, + "TLS_KEY_PATH": self._tls_key_path, + "CA_CERT_TLS_PATH": self._tls_ca_path, + } + ) - return Layer( - { - "services": { - self.name: { - "override": "replace", - "summary": "litmus backend server layer", - "command": "/bin/server", - "startup": "enabled", - "environment": env, - } - }, - } - ) + return env + + @property + def litmus_backend_ports(self) -> tuple[int, int]: + if not self.tls_config_getter(): + return self.http_port, self.grpc_port + return self.https_port, self.grpc_tls_port diff --git a/backend/tests/integration/conftest.py b/backend/tests/integration/conftest.py index 8f546b1..9baa954 100644 --- a/backend/tests/integration/conftest.py +++ b/backend/tests/integration/conftest.py @@ -15,6 +15,7 @@ image_name: image_meta["upstream-source"] for image_name, image_meta in _METADATA["resources"].items() } +MONGO_APP = "mongodb-k8s" logger = logging.getLogger(__name__) diff --git a/backend/tests/integration/helpers.py b/backend/tests/integration/helpers.py new file mode 100644 index 0000000..354ef79 --- /dev/null +++ b/backend/tests/integration/helpers.py @@ -0,0 +1,9 @@ +# Copyright 2025 Canonical Ltd. +# See LICENSE file for licensing details. + +from jubilant import Juju + + +def get_unit_ip_address(juju: Juju, app_name: str, unit_no: int): + """Return a juju unit's IP address.""" + return juju.status().apps[app_name].units[f"{app_name}/{unit_no}"].address diff --git a/backend/tests/integration/test_smoke.py b/backend/tests/integration/test_smoke.py index 155878c..ce391b9 100644 --- a/backend/tests/integration/test_smoke.py +++ b/backend/tests/integration/test_smoke.py @@ -2,24 +2,19 @@ # See LICENSE file for licensing details. import logging import shlex -import subprocess +from subprocess import check_call + import pytest from jubilant import Juju, all_blocked, all_active, any_error from pathlib import Path from tenacity import retry, stop_after_attempt, wait_fixed -from conftest import APP, RESOURCES - -MONGO_APP = "mongodb-k8s" +from conftest import APP, MONGO_APP, RESOURCES +from helpers import get_unit_ip_address logger = logging.getLogger(__name__) -def _get_unit_ip_address(juju: Juju, app_name: str, unit_no: int): - """Return a juju unit's IP address.""" - return juju.status().apps[app_name].units[f"{app_name}/{unit_no}"].address - - @pytest.mark.setup def test_setup(juju: Juju, charm: Path): juju.deploy(charm, APP, resources=RESOURCES, trust=True) @@ -37,14 +32,13 @@ def test_setup(juju: Juju, charm: Path): @retry(stop=stop_after_attempt(30), wait=wait_fixed(10)) # 5 minutes def test_backend_is_running(juju: Juju): - backend_ip = _get_unit_ip_address(juju, APP, 0) + backend_ip = get_unit_ip_address(juju, APP, 0) cmd = ( f"curl {backend_ip}:8080/query " '-H "Content-Type: application/json" ' '-d \'{"query": "{ listEnvironments(projectID:"test") {environments {name} } }"}\'' ) - out = subprocess.run(shlex.split(cmd), text=True, capture_output=True) - assert out.returncode == 0 + check_call(shlex.split(cmd)) @pytest.mark.teardown diff --git a/backend/tests/integration/test_tls.py b/backend/tests/integration/test_tls.py new file mode 100644 index 0000000..4e89e01 --- /dev/null +++ b/backend/tests/integration/test_tls.py @@ -0,0 +1,45 @@ +# Copyright 2025 Canonical Ltd. +# See LICENSE file for licensing details. + +import logging +from subprocess import getoutput + +import pytest +from jubilant import all_active, all_blocked, any_error, Juju +from pathlib import Path + +from tenacity import retry, stop_after_attempt, wait_fixed + +from conftest import APP, MONGO_APP, RESOURCES +from helpers import get_unit_ip_address + +SELF_SIGNED_CERTIFICATES_APP = "self-signed-certificates" + +logger = logging.getLogger(__name__) + + +@pytest.mark.setup +def test_setup(juju: Juju, charm: Path): + juju.deploy(charm, APP, resources=RESOURCES, trust=True) + juju.deploy(MONGO_APP, trust=True) + juju.deploy(SELF_SIGNED_CERTIFICATES_APP) + juju.integrate(f"{APP}:database", MONGO_APP) + juju.integrate(f"{APP}:tls-certificates", SELF_SIGNED_CERTIFICATES_APP) + + juju.wait( + lambda status: all_active(status, MONGO_APP, SELF_SIGNED_CERTIFICATES_APP) + and all_blocked(status, APP), + error=lambda status: any_error(status, APP), + timeout=1000, + delay=10, + successes=5, + ) + + +@retry(stop=stop_after_attempt(6), wait=wait_fixed(10)) +def test_tls_integration(juju: Juju): + backend_ip = get_unit_ip_address(juju, APP, 0) + cmd = f'openssl s_client -connect {backend_ip}:8081 | openssl x509 -noout -text | grep -A1 "Subject Alternative Name"' + out = getoutput(cmd) + assert f"DNS:{APP}.{juju.model}.svc.cluster.local" in out + assert f"DNS:{APP}-0.{APP}-endpoints.{juju.model}.svc.cluster.local" in out diff --git a/backend/tests/unit/certificates_helpers.py b/backend/tests/unit/certificates_helpers.py new file mode 100644 index 0000000..47d1891 --- /dev/null +++ b/backend/tests/unit/certificates_helpers.py @@ -0,0 +1,44 @@ +# Copyright 2025 Canonical Ltd. +# See LICENSE file for licensing details. + +from datetime import timedelta + +from charms.tls_certificates_interface.v4.tls_certificates import ( + PrivateKey, + ProviderCertificate, + generate_ca, + generate_certificate, + generate_csr, + generate_private_key, +) + + +# TODO: Move this under litmus-libs, i.e. litmus_libs.integrations.tls.testing +def mock_cert_and_key( + relation_id: int = 1, +) -> tuple[ProviderCertificate, PrivateKey]: + private_key = generate_private_key() + csr = generate_csr( + private_key=private_key, + common_name="litmus-backend.test", + ) + ca_private_key = generate_private_key() + ca_certificate = generate_ca( + private_key=ca_private_key, + common_name="ca.com", + validity=timedelta(days=365), + ) + certificate = generate_certificate( + csr=csr, + ca=ca_certificate, + ca_private_key=ca_private_key, + validity=timedelta(days=365), + ) + provider_certificate = ProviderCertificate( + relation_id=relation_id, + certificate=certificate, + certificate_signing_request=csr, + ca=ca_certificate, + chain=[ca_certificate], + ) + return provider_certificate, private_key diff --git a/backend/tests/unit/conftest.py b/backend/tests/unit/conftest.py index 82da57e..a323545 100644 --- a/backend/tests/unit/conftest.py +++ b/backend/tests/unit/conftest.py @@ -1,11 +1,12 @@ # Copyright 2025 Canonical Ltd. # See LICENSE file for licensing details. -from unittest.mock import patch +from unittest.mock import patch, Mock import json from ops.testing import Container, Context, Relation import pytest from charm import LitmusBackendCharm +from certificates_helpers import mock_cert_and_key @pytest.fixture @@ -17,6 +18,29 @@ def backend_charm(): yield LitmusBackendCharm +@pytest.fixture +def cert_and_key(): + return mock_cert_and_key() + + +@pytest.fixture() +def patch_cert_and_key(cert_and_key): + with patch( + "charms.tls_certificates_interface.v4.tls_certificates.TLSCertificatesRequiresV4.get_assigned_certificate", + return_value=cert_and_key, + ): + yield + + +@pytest.fixture(autouse=True) +def patch_container_exec(): + with patch( + "ops.model.Container.exec", + Mock(), + ): + yield + + @pytest.fixture def backend_container(): return Container( @@ -40,6 +64,16 @@ def auth_relation(): return Relation("litmus-auth") +@pytest.fixture +def http_api_relation(): + return Relation("http-api") + + +@pytest.fixture +def tls_certificates_relation(): + return Relation("tls-certificates") + + def db_remote_databag(): return { "uris": "uris", @@ -61,8 +95,3 @@ def http_api_remote_databag(): "version": json.dumps(0), "endpoint": json.dumps("http://foo.com:8080"), } - - -@pytest.fixture -def http_api_relation(): - return Relation("http-api") diff --git a/backend/tests/unit/test_litmus_auth_integration.py b/backend/tests/unit/test_litmus_auth_integration.py index 4975ff8..3071f18 100644 --- a/backend/tests/unit/test_litmus_auth_integration.py +++ b/backend/tests/unit/test_litmus_auth_integration.py @@ -66,7 +66,9 @@ def test_get_auth_grpc_endpoint( ), ), ) -def test_publish_endpoint(ctx, auth_relation, backend_container, leader, expected): +def test_publish_endpoint_without_tls( + ctx, auth_relation, backend_container, leader, expected +): # GIVEN an auth integration auth_relation = dataclasses.replace(auth_relation) @@ -84,3 +86,49 @@ def test_publish_endpoint(ctx, auth_relation, backend_container, leader, expecte # THEN the leader unit will publish it's grpc server endpoint relation_out = state_out.get_relation(auth_relation.id) assert relation_out.local_app_data == expected + + +@pytest.mark.parametrize( + "leader, expected", + ( + (False, {}), + ( + True, + { + "grpc_server_host": json.dumps( + "litmus-backend-k8s.test.svc.cluster.local" + ), + "grpc_server_port": json.dumps(8001), + "insecure": json.dumps(False), + "version": json.dumps(0), + }, + ), + ), +) +def test_publish_endpoint_with_tls( + ctx, + auth_relation, + tls_certificates_relation, + patch_cert_and_key, + backend_container, + leader, + expected, +): + # GIVEN an auth integration + auth_relation = dataclasses.replace(auth_relation) + tls_certificates_relation = dataclasses.replace(tls_certificates_relation) + + # WHEN a relation_changed event fires + state_out = ctx.run( + state=State( + relations={auth_relation, tls_certificates_relation}, + containers={backend_container}, + leader=leader, + model=Model(name="test"), + ), + event=ctx.on.relation_changed(auth_relation), + ) + + # THEN the leader unit will publish it's grpc server endpoint + relation_out = state_out.get_relation(auth_relation.id) + assert relation_out.local_app_data == expected diff --git a/backend/tests/unit/test_pebble_plan.py b/backend/tests/unit/test_pebble_plan.py index b69292f..bb5a492 100644 --- a/backend/tests/unit/test_pebble_plan.py +++ b/backend/tests/unit/test_pebble_plan.py @@ -37,9 +37,9 @@ def test_pebble_plan_minimal(ctx, backend_container): # THEN litmus backend server pebble plan is generated with the right env vars backend_container_out = state_out.get_container(backend_container.name) - actual_env_vars = backend_container_out.plan.to_dict()["services"][ - "backend" - ]["environment"] + actual_env_vars = backend_container_out.plan.to_dict()["services"]["backend"][ + "environment" + ] assert actual_env_vars.keys() == expected_env_vars # AND the pebble service is NOT running @@ -64,9 +64,9 @@ def test_pebble_plan_with_database_relation(ctx, backend_container, database_rel # THEN litmus backend server pebble plan is generated with extra db env vars backend_container_out = state_out.get_container(backend_container.name) - actual_env_vars = backend_container_out.plan.to_dict()["services"][ - "backend" - ]["environment"] + actual_env_vars = backend_container_out.plan.to_dict()["services"]["backend"][ + "environment" + ] assert expected_env_vars.issubset(actual_env_vars.keys()) # AND the pebble service is running @@ -90,9 +90,9 @@ def test_pebble_plan_with_auth_relation(ctx, backend_container, auth_relation): # THEN litmus backend server pebble plan is generated with extra db env vars backend_container_out = state_out.get_container(backend_container.name) - actual_env_vars = backend_container_out.plan.to_dict()["services"][ - "backend" - ]["environment"] + actual_env_vars = backend_container_out.plan.to_dict()["services"]["backend"][ + "environment" + ] assert expected_env_vars.issubset(actual_env_vars.keys()) # AND the pebble service is NOT running @@ -117,9 +117,38 @@ def test_pebble_plan_with_backend_http_api_relation( # THEN litmus backend server pebble plan is generated with extra db env vars backend_container_out = state_out.get_container(backend_container.name) - actual_env_vars = backend_container_out.plan.to_dict()["services"][ - "backend" - ]["environment"] + actual_env_vars = backend_container_out.plan.to_dict()["services"]["backend"][ + "environment" + ] + assert expected_env_vars.issubset(actual_env_vars.keys()) + + # AND the pebble service is NOT running + assert not backend_container_out.services.get("backend").is_running() + + +def test_pebble_plan_with_tls_certificates_relation( + ctx, backend_container, tls_certificates_relation, patch_cert_and_key +): + expected_env_vars = { + "ENABLE_INTERNAL_TLS", + "REST_PORT", + "GRPC_PORT", + "TLS_CERT_PATH", + "TLS_KEY_PATH", + "CA_CERT_TLS_PATH", + } + + # GIVEN a running container with a tls-certificates relation + state = State(containers=[backend_container], relations=[tls_certificates_relation]) + + # WHEN a relation changed event is fired + state_out = ctx.run(ctx.on.relation_changed(tls_certificates_relation), state=state) + + # THEN litmus backend server pebble plan is generated with extra TLS env vars + backend_container_out = state_out.get_container(backend_container.name) + actual_env_vars = backend_container_out.plan.to_dict()["services"]["backend"][ + "environment" + ] assert expected_env_vars.issubset(actual_env_vars.keys()) # AND the pebble service is NOT running diff --git a/backend/tests/unit/test_tls_certificates_integration.py b/backend/tests/unit/test_tls_certificates_integration.py new file mode 100644 index 0000000..18f0000 --- /dev/null +++ b/backend/tests/unit/test_tls_certificates_integration.py @@ -0,0 +1,164 @@ +# Copyright 2025 Canonical Ltd. +# See LICENSE file for licensing details. + +import os +import tempfile +from pathlib import Path + +from ops.testing import Mount, State + + +def test_tls_certs_saved_to_the_disk_when_available_in_tls_certificates_relation_databag( + ctx, backend_container, tls_certificates_relation, patch_cert_and_key +): + # GIVEN a running container with a tls-certificates relation + state = State(containers=[backend_container], relations=[tls_certificates_relation]) + + # WHEN a relation changed event is fired + state_out = ctx.run(ctx.on.relation_changed(tls_certificates_relation), state=state) + + # THEN TLS certs are stored in the workload container + backend_container_out = state_out.get_container(backend_container.name) + + assert os.path.exists( + f"{backend_container_out.get_filesystem(ctx)}/etc/tls/tls.crt" + ) + assert os.path.exists( + f"{backend_container_out.get_filesystem(ctx)}/etc/tls/tls.key" + ) + assert os.path.exists( + f"{backend_container_out.get_filesystem(ctx)}/usr/local/share/ca-certificates/ca.crt" + ) + + +def test_tls_certs_removed_from_disk_when_tls_certificates_relation_is_broken( + ctx, backend_container, tls_certificates_relation +): + with tempfile.TemporaryDirectory() as tempdir: + certs_mount = Mount( + location="/etc/tls", + source=tempdir, + ) + backend_container.mounts["certs"] = certs_mount + + # GIVEN a running container with a tls-certificates relation and TLS certs stored on the disk + state = State( + containers=[backend_container], relations=[tls_certificates_relation] + ) + os.makedirs(f"{tempdir}/etc/tls", exist_ok=True) + backend_container_in = state.get_container(backend_container.name) + os.makedirs( + f"{backend_container_in.get_filesystem(ctx)}/usr/local/share/ca-certificates", + exist_ok=True, + ) + with open(f"{tempdir}/tls.crt", "w") as f: + f.write("certificate") + with open(f"{tempdir}/tls.key", "w") as f: + f.write("private key") + with open( + f"{backend_container_in.get_filesystem(ctx)}/usr/local/share/ca-certificates/ca.crt", + "w", + ) as f: + f.write("CA certificate") + + # WHEN a relation broken event is fired + state_out = ctx.run( + ctx.on.relation_broken(tls_certificates_relation), state=state + ) + + # THEN TLS certs are removed from the workload container + backend_container_out = state_out.get_container(backend_container.name) + assert not os.path.exists(f"{tempdir}/tls.crt") + assert not os.path.exists(f"{tempdir}/tls.key") + assert not os.path.exists( + f"{backend_container_out.get_filesystem(ctx)}/usr/local/share/ca-certificates/ca.crt" + ) + + +def test_tls_certs_not_updated_if_stored_certs_match_these_from_the_relation_databag( + ctx, backend_container, tls_certificates_relation, cert_and_key, patch_cert_and_key +): + with tempfile.TemporaryDirectory() as tempdir: + certs_mount = Mount( + location="/etc", + source=Path(tempdir) / "etc", + ) + usr_mount = Mount( + location="/usr", + source=Path(tempdir) / "usr", + ) + certs, key = cert_and_key + backend_container.mounts["certs"] = certs_mount + backend_container.mounts["usr"] = usr_mount + + # GIVEN a running container with a tls-certificates relation and up-to-date TLS certs stored on the disk + state = State( + containers=[backend_container], relations=[tls_certificates_relation] + ) + os.makedirs(f"{tempdir}/etc/tls", exist_ok=True) + os.makedirs(f"{tempdir}/usr/local/share/ca-certificates", exist_ok=True) + + with open(f"{tempdir}/etc/tls/tls.crt", "w") as f: + f.write(str(certs.certificate)) + with open(f"{tempdir}/etc/tls/tls.key", "w") as f: + f.write(str(key)) + with open(f"{tempdir}/usr/local/share/ca-certificates/ca.crt", "w+") as f: + f.write(str(certs.ca)) + cert_modification_time = os.stat(f"{tempdir}/etc/tls/tls.crt").st_mtime + key_modification_time = os.stat(f"{tempdir}/etc/tls/tls.key").st_mtime + ca_modification_time = os.stat( + f"{tempdir}/usr/local/share/ca-certificates/ca.crt" + ).st_mtime + + # WHEN a relation changed event is fired + ctx.run(ctx.on.relation_changed(tls_certificates_relation), state=state) + + # THEN TLS certs stored in the workload container aren't changed + assert os.stat(f"{tempdir}/etc/tls/tls.crt").st_mtime == cert_modification_time + assert os.stat(f"{tempdir}/etc/tls/tls.key").st_mtime == key_modification_time + assert ( + os.stat(f"{tempdir}/usr/local/share/ca-certificates/ca.crt").st_mtime + == ca_modification_time + ) + + +def test_tls_certs_updated_if_stored_certs_dont_match_these_from_the_relation_databag( + ctx, backend_container, tls_certificates_relation, cert_and_key, patch_cert_and_key +): + with tempfile.TemporaryDirectory() as tempdir: + certs_mount = Mount( + location="/etc", + source=Path(tempdir) / "etc", + ) + usr_mount = Mount( + location="/usr", + source=Path(tempdir) / "usr", + ) + certs, key = cert_and_key + backend_container.mounts["certs"] = certs_mount + backend_container.mounts["usr"] = usr_mount + + # GIVEN a running container with a tls-certificates relation and outdated TLS certs stored on the disk + state = State( + containers=[backend_container], relations=[tls_certificates_relation] + ) + os.makedirs(f"{tempdir}/etc/tls", exist_ok=True) + os.makedirs(f"{tempdir}/usr/local/share/ca-certificates", exist_ok=True) + + with open(f"{tempdir}/etc/tls/tls.crt", "w") as f: + f.write("certificate") + with open(f"{tempdir}/etc/tls/tls.key", "w") as f: + f.write("private key") + with open(f"{tempdir}/usr/local/share/ca-certificates/ca.crt", "w+") as f: + f.write("ca cert") + + # WHEN a relation changed event is fired + ctx.run(ctx.on.relation_changed(tls_certificates_relation), state=state) + + # THEN TLS certs stored in the workload container are updated + with open(f"{tempdir}/etc/tls/tls.crt", "r") as f: + assert f.read() == str(certs.certificate) + with open(f"{tempdir}/etc/tls/tls.key", "r") as f: + assert f.read() == str(key) + with open(f"{tempdir}/usr/local/share/ca-certificates/ca.crt", "r") as f: + assert f.read() == str(certs.ca) diff --git a/backend/uv.lock b/backend/uv.lock index da49d7e..3e4bdcb 100644 --- a/backend/uv.lock +++ b/backend/uv.lock @@ -11,6 +11,39 @@ wheels = [ { url = 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+@pytest.mark.xfail(reason="Expected to fail until all the TLS PRs are merged") @retry(stop=stop_after_attempt(30), wait=wait_fixed(10)) # 5 minutes def test_auth_is_served_through_nginx(juju: Juju): # GIVEN control plane is deployed