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// Resolves the default auth mechanism according to
import type { Document } from '../../bson';
import {
MongoAPIError,
MongoInvalidArgumentError,
MongoMissingCredentialsError
} from '../../error';
import type { AWSCredentialProvider } from './aws_temporary_credentials';
import { GSSAPICanonicalizationValue } from './gssapi';
import type { OIDCCallbackFunction } from './mongodb_oidc';
import { AUTH_MECHS_AUTH_SRC_EXTERNAL, AuthMechanism } from './providers';
/**
* @see https://github.com/mongodb/specifications/blob/master/source/auth/auth.md
*/
function getDefaultAuthMechanism(hello: Document | null): AuthMechanism {
Eif (hello) {
// If hello contains saslSupportedMechs, use scram-sha-256
// if it is available, else scram-sha-1
if (Array.isArray(hello.saslSupportedMechs)) {
return hello.saslSupportedMechs.includes(AuthMechanism.MONGODB_SCRAM_SHA256)
? AuthMechanism.MONGODB_SCRAM_SHA256
: AuthMechanism.MONGODB_SCRAM_SHA1;
}
}
// Default auth mechanism for 4.0 and higher.
return AuthMechanism.MONGODB_SCRAM_SHA256;
}
const ALLOWED_ENVIRONMENT_NAMES: AuthMechanismProperties['ENVIRONMENT'][] = [
'test',
'azure',
'gcp',
'k8s'
];
const ALLOWED_HOSTS_ERROR = 'Auth mechanism property ALLOWED_HOSTS must be an array of strings.';
/** @internal */
export const DEFAULT_ALLOWED_HOSTS = [
'*.mongodb.net',
'*.mongodb-qa.net',
'*.mongodb-dev.net',
'*.mongodbgov.net',
'localhost',
'127.0.0.1',
'::1'
];
/** Error for when the token audience is missing in the environment. */
const TOKEN_RESOURCE_MISSING_ERROR =
'TOKEN_RESOURCE must be set in the auth mechanism properties when ENVIRONMENT is azure or gcp.';
/** @public */
export interface AuthMechanismProperties extends Document {
SERVICE_HOST?: string;
SERVICE_NAME?: string;
SERVICE_REALM?: string;
CANONICALIZE_HOST_NAME?: GSSAPICanonicalizationValue;
AWS_SESSION_TOKEN?: string;
/** A user provided OIDC machine callback function. */
OIDC_CALLBACK?: OIDCCallbackFunction;
/** A user provided OIDC human interacted callback function. */
OIDC_HUMAN_CALLBACK?: OIDCCallbackFunction;
/** The OIDC environment. Note that 'test' is for internal use only. */
ENVIRONMENT?: 'test' | 'azure' | 'gcp' | 'k8s';
/** Allowed hosts that OIDC auth can connect to. */
ALLOWED_HOSTS?: string[];
/** The resource token for OIDC auth in Azure and GCP. */
TOKEN_RESOURCE?: string;
/**
* A custom AWS credential provider to use. An example using the AWS SDK default provider chain:
*
* ```ts
* const client = new MongoClient(process.env.MONGODB_URI, {
* authMechanismProperties: {
* AWS_CREDENTIAL_PROVIDER: fromNodeProviderChain()
* }
* });
* ```
*
* Using a custom function that returns AWS credentials:
*
* ```ts
* const client = new MongoClient(process.env.MONGODB_URI, {
* authMechanismProperties: {
* AWS_CREDENTIAL_PROVIDER: async () => {
* return {
* accessKeyId: process.env.ACCESS_KEY_ID,
* secretAccessKey: process.env.SECRET_ACCESS_KEY
* }
* }
* }
* });
* ```
*/
AWS_CREDENTIAL_PROVIDER?: AWSCredentialProvider;
}
/** @public */
export interface MongoCredentialsOptions {
username?: string;
password: string;
source: string;
db?: string;
mechanism?: AuthMechanism;
mechanismProperties: AuthMechanismProperties;
}
/**
* A representation of the credentials used by MongoDB
* @public
*/
export class MongoCredentials {
/** The username used for authentication */
readonly username: string;
/** The password used for authentication */
readonly password: string;
/** The database that the user should authenticate against */
readonly source: string;
/** The method used to authenticate */
readonly mechanism: AuthMechanism;
/** Special properties used by some types of auth mechanisms */
readonly mechanismProperties: AuthMechanismProperties;
constructor(options: MongoCredentialsOptions) {
this.username = options.username ?? '';
this.password = options.password;
this.source = options.source;
Iif (!this.source && options.db) {
this.source = options.db;
}
this.mechanism = options.mechanism || AuthMechanism.MONGODB_DEFAULT;
this.mechanismProperties = options.mechanismProperties || {};
if (this.mechanism.match(/MONGODB-AWS/i)) {
if (!this.username && process.env.AWS_ACCESS_KEY_ID) {
this.username = process.env.AWS_ACCESS_KEY_ID;
}
if (!this.password && process.env.AWS_SECRET_ACCESS_KEY) {
this.password = process.env.AWS_SECRET_ACCESS_KEY;
}
if (
this.mechanismProperties.AWS_SESSION_TOKEN == null &&
process.env.AWS_SESSION_TOKEN != null
) {
this.mechanismProperties = {
...this.mechanismProperties,
AWS_SESSION_TOKEN: process.env.AWS_SESSION_TOKEN
};
}
}
if (this.mechanism === AuthMechanism.MONGODB_OIDC && !this.mechanismProperties.ALLOWED_HOSTS) {
this.mechanismProperties = {
...this.mechanismProperties,
ALLOWED_HOSTS: DEFAULT_ALLOWED_HOSTS
};
}
Object.freeze(this.mechanismProperties);
Object.freeze(this);
}
/** Determines if two MongoCredentials objects are equivalent */
equals(other: MongoCredentials): boolean {
return (
this.mechanism === other.mechanism &&
this.username === other.username &&
this.password === other.password &&
this.source === other.source
);
}
/**
* If the authentication mechanism is set to "default", resolves the authMechanism
* based on the server version and server supported sasl mechanisms.
*
* @param hello - A hello response from the server
*/
resolveAuthMechanism(hello: Document | null): MongoCredentials {
// If the mechanism is not "default", then it does not need to be resolved
if (this.mechanism.match(/DEFAULT/i)) {
return new MongoCredentials({
username: this.username,
password: this.password,
source: this.source,
mechanism: getDefaultAuthMechanism(hello),
mechanismProperties: this.mechanismProperties
});
}
return this;
}
validate(): void {
if (
(this.mechanism === AuthMechanism.MONGODB_GSSAPI ||
this.mechanism === AuthMechanism.MONGODB_PLAIN ||
this.mechanism === AuthMechanism.MONGODB_SCRAM_SHA1 ||
this.mechanism === AuthMechanism.MONGODB_SCRAM_SHA256) &&
!this.username
) {
throw new MongoMissingCredentialsError(`Username required for mechanism '${this.mechanism}'`);
}
if (this.mechanism === AuthMechanism.MONGODB_OIDC) {
if (
this.username &&
this.mechanismProperties.ENVIRONMENT &&
this.mechanismProperties.ENVIRONMENT !== 'azure'
) {
throw new MongoInvalidArgumentError(
`username and ENVIRONMENT '${this.mechanismProperties.ENVIRONMENT}' may not be used together for mechanism '${this.mechanism}'.`
);
}
if (this.username && this.password) {
throw new MongoInvalidArgumentError(
`No password is allowed in ENVIRONMENT '${this.mechanismProperties.ENVIRONMENT}' for '${this.mechanism}'.`
);
}
if (
(this.mechanismProperties.ENVIRONMENT === 'azure' ||
this.mechanismProperties.ENVIRONMENT === 'gcp') &&
!this.mechanismProperties.TOKEN_RESOURCE
) {
throw new MongoInvalidArgumentError(TOKEN_RESOURCE_MISSING_ERROR);
}
if (
this.mechanismProperties.ENVIRONMENT &&
!ALLOWED_ENVIRONMENT_NAMES.includes(this.mechanismProperties.ENVIRONMENT)
) {
throw new MongoInvalidArgumentError(
`Currently only a ENVIRONMENT in ${ALLOWED_ENVIRONMENT_NAMES.join(
','
)} is supported for mechanism '${this.mechanism}'.`
);
}
if (
!this.mechanismProperties.ENVIRONMENT &&
!this.mechanismProperties.OIDC_CALLBACK &&
!this.mechanismProperties.OIDC_HUMAN_CALLBACK
) {
throw new MongoInvalidArgumentError(
`Either a ENVIRONMENT, OIDC_CALLBACK, or OIDC_HUMAN_CALLBACK must be specified for mechanism '${this.mechanism}'.`
);
}
Eif (this.mechanismProperties.ALLOWED_HOSTS) {
const hosts = this.mechanismProperties.ALLOWED_HOSTS;
Iif (!Array.isArray(hosts)) {
throw new MongoInvalidArgumentError(ALLOWED_HOSTS_ERROR);
}
for (const host of hosts) {
if (typeof host !== 'string') {
throw new MongoInvalidArgumentError(ALLOWED_HOSTS_ERROR);
}
}
}
}
if (AUTH_MECHS_AUTH_SRC_EXTERNAL.has(this.mechanism)) {
Iif (this.source != null && this.source !== '$external') {
// TODO(NODE-3485): Replace this with a MongoAuthValidationError
throw new MongoAPIError(
`Invalid source '${this.source}' for mechanism '${this.mechanism}' specified.`
);
}
}
Iif (this.mechanism === AuthMechanism.MONGODB_PLAIN && this.source == null) {
// TODO(NODE-3485): Replace this with a MongoAuthValidationError
throw new MongoAPIError('PLAIN Authentication Mechanism needs an auth source');
}
if (this.mechanism === AuthMechanism.MONGODB_X509 && this.password != null) {
if (this.password === '') {
Reflect.set(this, 'password', undefined);
return;
}
// TODO(NODE-3485): Replace this with a MongoAuthValidationError
throw new MongoAPIError(`Password not allowed for mechanism MONGODB-X509`);
}
const canonicalization = this.mechanismProperties.CANONICALIZE_HOST_NAME ?? false;
if (!Object.values(GSSAPICanonicalizationValue).includes(canonicalization)) {
throw new MongoAPIError(`Invalid CANONICALIZE_HOST_NAME value: ${canonicalization}`);
}
}
static merge(
creds: MongoCredentials | undefined,
options: Partial<MongoCredentialsOptions>
): MongoCredentials {
return new MongoCredentials({
username: options.username ?? creds?.username ?? '',
password: options.password ?? creds?.password ?? '',
mechanism: options.mechanism ?? creds?.mechanism ?? AuthMechanism.MONGODB_DEFAULT,
mechanismProperties: options.mechanismProperties ?? creds?.mechanismProperties ?? {},
source: options.source ?? options.db ?? creds?.source ?? 'admin'
});
}
}
|