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Copyright (c) Microsoft Corporation.\n// Licensed under the MIT License.\n\nimport type { AccessToken, GetTokenOptions, TokenCredential } from \"@azure/core-auth\";\n\nimport type { TokenCredentialOptions } from \"../../tokenCredentialOptions.js\";\nimport { getLogLevel } from \"@azure/logger\";\nimport { ManagedIdentityApplication } from \"@azure/msal-node\";\nimport { IdentityClient } from \"../../client/identityClient.js\";\nimport { AuthenticationRequiredError, CredentialUnavailableError } from \"../../errors.js\";\nimport { getMSALLogLevel, defaultLoggerCallback } from \"../../msal/utils.js\";\nimport { imdsRetryPolicy } from \"./imdsRetryPolicy.js\";\nimport type { MSIConfiguration } from \"./models.js\";\nimport { formatSuccess, formatError, credentialLogger } from \"../../util/logging.js\";\nimport { tracingClient } from \"../../util/tracing.js\";\nimport { imdsMsi } from \"./imdsMsi.js\";\nimport { tokenExchangeMsi } from \"./tokenExchangeMsi.js\";\nimport { mapScopesToResource, serviceFabricErrorMessage } from \"./utils.js\";\nimport type { MsalToken, ValidMsalToken } from \"../../msal/types.js\";\nimport type {\n InternalManagedIdentityCredentialOptions,\n ManagedIdentityCredentialClientIdOptions,\n ManagedIdentityCredentialObjectIdOptions,\n ManagedIdentityCredentialResourceIdOptions,\n} from \"./options.js\";\n\nconst logger = credentialLogger(\"ManagedIdentityCredential\");\n\n/**\n * Attempts authentication using a managed identity available at the deployment environment.\n * This authentication type works in Azure VMs, App Service instances, Azure Functions applications,\n * Azure Kubernetes Services, Azure Service Fabric instances and inside of the Azure Cloud Shell.\n *\n * More information about configuring managed identities can be found here:\n * https://learn.microsoft.com/azure/active-directory/managed-identities-azure-resources/overview\n */\nexport class ManagedIdentityCredential implements TokenCredential {\n private managedIdentityApp: ManagedIdentityApplication;\n private identityClient: IdentityClient;\n private clientId?: string;\n private resourceId?: string;\n private objectId?: string;\n private msiRetryConfig: MSIConfiguration[\"retryConfig\"] = {\n maxRetries: 5,\n startDelayInMs: 800,\n intervalIncrement: 2,\n };\n private isAvailableIdentityClient: IdentityClient;\n private sendProbeRequest: boolean;\n\n /**\n * Creates an instance of ManagedIdentityCredential with the client ID of a\n * user-assigned identity, or app registration (when working with AKS pod-identity).\n *\n * @param clientId - The client ID of the user-assigned identity, or app registration (when working with AKS pod-identity).\n * @param options - Options for configuring the client which makes the access token request.\n */\n constructor(clientId: string, options?: TokenCredentialOptions);\n /**\n * Creates an instance of ManagedIdentityCredential with a client ID\n *\n * @param options - Options for configuring the client which makes the access token request.\n */\n constructor(options?: ManagedIdentityCredentialClientIdOptions);\n /**\n * Creates an instance of ManagedIdentityCredential with a resource ID\n *\n * @param options - Options for configuring the resource which makes the access token request.\n */\n constructor(options?: ManagedIdentityCredentialResourceIdOptions);\n /**\n * Creates an instance of ManagedIdentityCredential with an object ID\n *\n * @param options - Options for configuring the resource which makes the access token request.\n */\n constructor(options?: ManagedIdentityCredentialObjectIdOptions);\n /**\n * @internal\n * @hidden\n */\n constructor(\n clientIdOrOptions?:\n | string\n | ManagedIdentityCredentialClientIdOptions\n | ManagedIdentityCredentialResourceIdOptions\n | ManagedIdentityCredentialObjectIdOptions,\n options?: TokenCredentialOptions,\n ) {\n let _options: TokenCredentialOptions;\n if (typeof clientIdOrOptions === \"string\") {\n this.clientId = clientIdOrOptions;\n _options = options ?? {};\n } else {\n this.clientId = (clientIdOrOptions as ManagedIdentityCredentialClientIdOptions)?.clientId;\n _options = clientIdOrOptions ?? {};\n }\n this.resourceId = (_options as ManagedIdentityCredentialResourceIdOptions)?.resourceId;\n this.objectId = (_options as ManagedIdentityCredentialObjectIdOptions)?.objectId;\n this.sendProbeRequest =\n (_options as InternalManagedIdentityCredentialOptions)?.sendProbeRequest ?? false;\n // For JavaScript users.\n const providedIds = [\n { key: \"clientId\", value: this.clientId },\n { key: \"resourceId\", value: this.resourceId },\n { key: \"objectId\", value: this.objectId },\n ].filter((id) => id.value);\n if (providedIds.length > 1) {\n throw new Error(\n `ManagedIdentityCredential: only one of 'clientId', 'resourceId', or 'objectId' can be provided. Received values: ${JSON.stringify(\n { clientId: this.clientId, resourceId: this.resourceId, objectId: this.objectId },\n )}`,\n );\n }\n\n // ManagedIdentity uses http for local requests\n _options.allowInsecureConnection = true;\n\n if (_options.retryOptions?.maxRetries !== undefined) {\n this.msiRetryConfig.maxRetries = _options.retryOptions.maxRetries;\n }\n\n this.identityClient = new IdentityClient({\n ..._options,\n additionalPolicies: [{ policy: imdsRetryPolicy(this.msiRetryConfig), position: \"perCall\" }],\n });\n\n this.managedIdentityApp = new ManagedIdentityApplication({\n managedIdentityIdParams: {\n userAssignedClientId: this.clientId,\n userAssignedResourceId: this.resourceId,\n userAssignedObjectId: this.objectId,\n },\n system: {\n disableInternalRetries: true,\n networkClient: this.identityClient,\n loggerOptions: {\n logLevel: getMSALLogLevel(getLogLevel()),\n piiLoggingEnabled: _options.loggingOptions?.enableUnsafeSupportLogging,\n loggerCallback: defaultLoggerCallback(logger),\n },\n },\n });\n\n this.isAvailableIdentityClient = new IdentityClient({\n ..._options,\n retryOptions: {\n maxRetries: 0,\n },\n });\n\n const managedIdentitySource = this.managedIdentityApp.getManagedIdentitySource();\n // CloudShell MSI will ignore any user-assigned identity passed as parameters. To avoid confusion, we prevent this from happening as early as possible.\n if (managedIdentitySource === \"CloudShell\") {\n if (this.clientId || this.resourceId || this.objectId) {\n logger.warning(\n `CloudShell MSI detected with user-provided IDs - throwing. Received values: ${JSON.stringify(\n {\n clientId: this.clientId,\n resourceId: this.resourceId,\n objectId: this.objectId,\n },\n )}.`,\n );\n throw new CredentialUnavailableError(\n \"ManagedIdentityCredential: Specifying a user-assigned managed identity is not supported for CloudShell at runtime. When using Managed Identity in CloudShell, omit the clientId, resourceId, and objectId parameters.\",\n );\n }\n }\n\n // ServiceFabric does not support specifying user-assigned managed identity by client ID or resource ID. The managed identity selected is based on the resource configuration.\n if (managedIdentitySource === \"ServiceFabric\") {\n if (this.clientId || this.resourceId || this.objectId) {\n logger.warning(\n `Service Fabric detected with user-provided IDs - throwing. Received values: ${JSON.stringify(\n {\n clientId: this.clientId,\n resourceId: this.resourceId,\n objectId: this.objectId,\n },\n )}.`,\n );\n throw new CredentialUnavailableError(\n `ManagedIdentityCredential: ${serviceFabricErrorMessage}`,\n );\n }\n }\n\n logger.info(`Using ${managedIdentitySource} managed identity.`);\n\n // Check if either clientId, resourceId or objectId was provided and log the value used\n if (providedIds.length === 1) {\n const { key, value } = providedIds[0];\n logger.info(`${managedIdentitySource} with ${key}: ${value}`);\n }\n }\n\n /**\n * Authenticates with Microsoft Entra ID and returns an access token if successful.\n * If authentication fails, a {@link CredentialUnavailableError} will be thrown with the details of the failure.\n * If an unexpected error occurs, an {@link AuthenticationError} will be thrown with the details of the failure.\n *\n * @param scopes - The list of scopes for which the token will have access.\n * @param options - The options used to configure any requests this\n * TokenCredential implementation might make.\n */\n public async getToken(\n scopes: string | string[],\n options: GetTokenOptions = {},\n ): Promise<AccessToken> {\n logger.getToken.info(\"Using the MSAL provider for Managed Identity.\");\n const resource = mapScopesToResource(scopes);\n if (!resource) {\n throw new CredentialUnavailableError(\n `ManagedIdentityCredential: Multiple scopes are not supported. Scopes: ${JSON.stringify(\n scopes,\n )}`,\n );\n }\n\n return tracingClient.withSpan(\"ManagedIdentityCredential.getToken\", options, async () => {\n try {\n const isTokenExchangeMsi = await tokenExchangeMsi.isAvailable(this.clientId);\n\n // Most scenarios are handled by MSAL except for two:\n // AKS pod identity - MSAL does not implement the token exchange flow.\n // IMDS Endpoint probing - MSAL does not do any probing before trying to get a token.\n // As a DefaultAzureCredential optimization we probe the IMDS endpoint with a short timeout and no retries before actually trying to get a token\n // We will continue to implement these features in the Identity library.\n\n const identitySource = this.managedIdentityApp.getManagedIdentitySource();\n const isImdsMsi = identitySource === \"DefaultToImds\" || identitySource === \"Imds\"; // Neither actually checks that IMDS endpoint is available, just that it's the source the MSAL _would_ try to use.\n\n logger.getToken.info(`MSAL Identity source: ${identitySource}`);\n\n if (isTokenExchangeMsi) {\n // In the AKS scenario we will use the existing tokenExchangeMsi indefinitely.\n logger.getToken.info(\"Using the token exchange managed identity.\");\n const result = await tokenExchangeMsi.getToken({\n scopes,\n clientId: this.clientId,\n identityClient: this.identityClient,\n retryConfig: this.msiRetryConfig,\n resourceId: this.resourceId,\n });\n\n if (result === null) {\n throw new CredentialUnavailableError(\n \"Attempted to use the token exchange managed identity, but received a null response.\",\n );\n }\n\n return result;\n } else if (isImdsMsi && this.sendProbeRequest) {\n // In the IMDS scenario we will probe the IMDS endpoint to ensure it's available before trying to get a token.\n // If the IMDS endpoint is not available and this is the source that MSAL will use, we will fail-fast with an error that tells DAC to move to the next credential.\n logger.getToken.info(\"Using the IMDS endpoint to probe for availability.\");\n const isAvailable = await imdsMsi.isAvailable({\n scopes,\n clientId: this.clientId,\n getTokenOptions: options,\n identityClient: this.isAvailableIdentityClient,\n resourceId: this.resourceId,\n });\n\n if (!isAvailable) {\n throw new CredentialUnavailableError(\n `Attempted to use the IMDS endpoint, but it is not available.`,\n );\n }\n }\n\n // If we got this far, it means:\n // - This is not a tokenExchangeMsi,\n // - We already probed for IMDS endpoint availability and failed-fast if it's unreachable,\n // or we skip probing because the credential is set in DAC.\n // We can proceed normally by calling MSAL for a token.\n logger.getToken.info(\"Calling into MSAL for managed identity token.\");\n const token = await this.managedIdentityApp.acquireToken({\n resource,\n });\n\n this.ensureValidMsalToken(scopes, token, options);\n logger.getToken.info(formatSuccess(scopes));\n\n return {\n expiresOnTimestamp: token.expiresOn.getTime(),\n token: token.accessToken,\n refreshAfterTimestamp: token.refreshOn?.getTime(),\n tokenType: \"Bearer\",\n } as AccessToken;\n } catch (err: any) {\n logger.getToken.error(formatError(scopes, err));\n\n // AuthenticationRequiredError described as Error to enforce authentication after trying to retrieve a token silently.\n // TODO: why would this _ever_ happen considering we're not trying the silent request in this flow?\n if (err.name === \"AuthenticationRequiredError\") {\n throw err;\n }\n\n if (isNetworkError(err)) {\n throw new CredentialUnavailableError(\n `ManagedIdentityCredential: Network unreachable. Message: ${err.message}`,\n { cause: err },\n );\n }\n\n throw new CredentialUnavailableError(\n `ManagedIdentityCredential: Authentication failed. Message ${err.message}`,\n { cause: err },\n );\n }\n });\n }\n\n /**\n * Ensures the validity of the MSAL token\n */\n private ensureValidMsalToken(\n scopes: string | string[],\n msalToken?: MsalToken,\n getTokenOptions?: GetTokenOptions,\n ): asserts msalToken is ValidMsalToken {\n const createError = (message: string): Error => {\n logger.getToken.info(message);\n return new AuthenticationRequiredError({\n scopes: Array.isArray(scopes) ? scopes : [scopes],\n getTokenOptions,\n message,\n });\n };\n if (!msalToken) {\n throw createError(\"No response.\");\n }\n if (!msalToken.expiresOn) {\n throw createError(`Response had no \"expiresOn\" property.`);\n }\n if (!msalToken.accessToken) {\n throw createError(`Response had no \"accessToken\" property.`);\n }\n }\n}\n\nfunction isNetworkError(err: any): boolean {\n // MSAL error\n if (err.errorCode === \"network_error\") {\n return true;\n }\n\n // Probe errors\n if (err.code === \"ENETUNREACH\" || err.code === \"EHOSTUNREACH\") {\n return true;\n }\n\n // This is a special case for Docker Desktop which responds with a 403 with a message that contains \"A socket operation was attempted to an unreachable network\" or \"A socket operation was attempted to an unreachable host\"\n // rather than just timing out, as expected.\n if (err.statusCode === 403 || err.code === 403) {\n if (err.message.includes(\"unreachable\")) {\n return true;\n }\n }\n\n return false;\n}\n"]}
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