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Viewing file:     fromInstanceMetadata.js (6.07 KB)      -rw-r--r--

import { loadConfig } from "@smithy/node-config-provider";
import { CredentialsProviderError } from "@smithy/property-provider";
import { InstanceMetadataV1FallbackError } from "./error/InstanceMetadataV1FallbackError";
import { httpRequest } from "./remoteProvider/httpRequest";
import { fromImdsCredentials, isImdsCredentials } from "./remoteProvider/ImdsCredentials";
import { providerConfigFromInit } from "./remoteProvider/RemoteProviderInit";
import { retry } from "./remoteProvider/retry";
import { getInstanceMetadataEndpoint } from "./utils/getInstanceMetadataEndpoint";
import { staticStabilityProvider } from "./utils/staticStabilityProvider";
const IMDS_PATH = "/latest/meta-data/iam/security-credentials/";
const IMDS_TOKEN_PATH = "/latest/api/token";
const AWS_EC2_METADATA_V1_DISABLED = "AWS_EC2_METADATA_V1_DISABLED";
const PROFILE_AWS_EC2_METADATA_V1_DISABLED = "ec2_metadata_v1_disabled";
const X_AWS_EC2_METADATA_TOKEN = "x-aws-ec2-metadata-token";
export const fromInstanceMetadata = (init = {}) => staticStabilityProvider(getInstanceMetadataProvider(init), { logger: init.logger });
const getInstanceMetadataProvider = (init = {}) => {
    let disableFetchToken = false;
    const { logger, profile } = init;
    const { timeout, maxRetries } = providerConfigFromInit(init);
    const getCredentials = async (maxRetries, options) => {
        const isImdsV1Fallback = disableFetchToken || options.headers?.[X_AWS_EC2_METADATA_TOKEN] == null;
        if (isImdsV1Fallback) {
            let fallbackBlockedFromProfile = false;
            let fallbackBlockedFromProcessEnv = false;
            const configValue = await loadConfig({
                environmentVariableSelector: (env) => {
                    const envValue = env[AWS_EC2_METADATA_V1_DISABLED];
                    fallbackBlockedFromProcessEnv = !!envValue && envValue !== "false";
                    if (envValue === undefined) {
                        throw new CredentialsProviderError(`${AWS_EC2_METADATA_V1_DISABLED} not set in env, checking config file next.`, { logger: init.logger });
                    }
                    return fallbackBlockedFromProcessEnv;
                },
                configFileSelector: (profile) => {
                    const profileValue = profile[PROFILE_AWS_EC2_METADATA_V1_DISABLED];
                    fallbackBlockedFromProfile = !!profileValue && profileValue !== "false";
                    return fallbackBlockedFromProfile;
                },
                default: false,
            }, {
                profile,
            })();
            if (init.ec2MetadataV1Disabled || configValue) {
                const causes = [];
                if (init.ec2MetadataV1Disabled)
                    causes.push("credential provider initialization (runtime option ec2MetadataV1Disabled)");
                if (fallbackBlockedFromProfile)
                    causes.push(`config file profile (${PROFILE_AWS_EC2_METADATA_V1_DISABLED})`);
                if (fallbackBlockedFromProcessEnv)
                    causes.push(`process environment variable (${AWS_EC2_METADATA_V1_DISABLED})`);
                throw new InstanceMetadataV1FallbackError(`AWS EC2 Metadata v1 fallback has been blocked by AWS SDK configuration in the following: [${causes.join(", ")}].`);
            }
        }
        const imdsProfile = (await retry(async () => {
            let profile;
            try {
                profile = await getProfile(options);
            }
            catch (err) {
                if (err.statusCode === 401) {
                    disableFetchToken = false;
                }
                throw err;
            }
            return profile;
        }, maxRetries)).trim();
        return retry(async () => {
            let creds;
            try {
                creds = await getCredentialsFromProfile(imdsProfile, options, init);
            }
            catch (err) {
                if (err.statusCode === 401) {
                    disableFetchToken = false;
                }
                throw err;
            }
            return creds;
        }, maxRetries);
    };
    return async () => {
        const endpoint = await getInstanceMetadataEndpoint();
        if (disableFetchToken) {
            logger?.debug("AWS SDK Instance Metadata", "using v1 fallback (no token fetch)");
            return getCredentials(maxRetries, { ...endpoint, timeout });
        }
        else {
            let token;
            try {
                token = (await getMetadataToken({ ...endpoint, timeout })).toString();
            }
            catch (error) {
                if (error?.statusCode === 400) {
                    throw Object.assign(error, {
                        message: "EC2 Metadata token request returned error",
                    });
                }
                else if (error.message === "TimeoutError" || [403, 404, 405].includes(error.statusCode)) {
                    disableFetchToken = true;
                }
                logger?.debug("AWS SDK Instance Metadata", "using v1 fallback (initial)");
                return getCredentials(maxRetries, { ...endpoint, timeout });
            }
            return getCredentials(maxRetries, {
                ...endpoint,
                headers: {
                    [X_AWS_EC2_METADATA_TOKEN]: token,
                },
                timeout,
            });
        }
    };
};
const getMetadataToken = async (options) => httpRequest({
    ...options,
    path: IMDS_TOKEN_PATH,
    method: "PUT",
    headers: {
        "x-aws-ec2-metadata-token-ttl-seconds": "21600",
    },
});
const getProfile = async (options) => (await httpRequest({ ...options, path: IMDS_PATH })).toString();
const getCredentialsFromProfile = async (profile, options, init) => {
    const credentialsResponse = JSON.parse((await httpRequest({
        ...options,
        path: IMDS_PATH + profile,
    })).toString());
    if (!isImdsCredentials(credentialsResponse)) {
        throw new CredentialsProviderError("Invalid response received from instance metadata service.", {
            logger: init.logger,
        });
    }
    return fromImdsCredentials(credentialsResponse);
};