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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 | 19x 19x 19x 19x 19x 19x 19x 16x 16x 3x 18x 18x 18x 18x 18x 18x 18x 10x 10x 10x 2x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 10x 10x 10x 10x 8x 8x 8x 8x 3x 5x 3x 3x 1x 2x 8x 8x 8x | // @flow import { decodeToken, TokenVerifier } from 'jsontokens' import { getAddressFromDID, publicKeyToAddress, isSameOriginAbsoluteUrl } from '../index' import { fetchAppManifest } from '.' /** * Checks if the ES256k signature on passed `token` match the claimed public key * in the payload key `public_keys`. * * @param {String} token encoded and signed authentication token * @return {Boolean} Returns `true` if the signature matches the claimed public key * @throws {Error} if `token` contains multiple public keys * @private */ export function doSignaturesMatchPublicKeys(token: string) { const payload = decodeToken(token).payload const publicKeys = payload.public_keys Eif (publicKeys.length === 1) { const publicKey = publicKeys[0] try { const tokenVerifier = new TokenVerifier('ES256k', publicKey) const signatureVerified = tokenVerifier.verify(token) Eif (signatureVerified) { return true } else { return false } } catch (e) { return false } } else { throw new Error('Multiple public keys are not supported') } } /** * Makes sure that the identity address portion of * the decentralized identifier passed in the issuer `iss` * key of the token matches the public key * * @param {String} token encoded and signed authentication token * @return {Boolean} if the identity address and public keys match * @throws {Error} if ` token` has multiple public keys * @private */ export function doPublicKeysMatchIssuer(token: string) { const payload = decodeToken(token).payload const publicKeys = payload.public_keys const addressFromIssuer = getAddressFromDID(payload.iss) Eif (publicKeys.length === 1) { const addressFromPublicKeys = publicKeyToAddress(publicKeys[0]) Eif (addressFromPublicKeys === addressFromIssuer) { return true } } else { throw new Error('Multiple public keys are not supported') } return false } /** * Looks up the identity address that owns the claimed username * in `token` using the lookup endpoint provided in `nameLookupURL` * to determine if the username is owned by the identity address * that matches the claimed public key * * @param {String} token encoded and signed authentication token * @param {String} nameLookupURL a URL to the name lookup endpoint of the Blockstack Core API * @return {Promise<Boolean>} returns a `Promise` that resolves to * `true` if the username is owned by the public key, otherwise the * `Promise` resolves to `false` * @private */ export function doPublicKeysMatchUsername(token: string, nameLookupURL: string) { return Promise.resolve().then(() => { const payload = decodeToken(token).payload if (!payload.username) { return true } Iif (payload.username === null) { return true } Iif (nameLookupURL === null) { return false } const username = payload.username const url = `${nameLookupURL.replace(/\/$/, '')}/${username}` return fetch(url) .then(response => response.text()) .then((responseText) => { const responseJSON = JSON.parse(responseText) Eif (responseJSON.hasOwnProperty('address')) { const nameOwningAddress = responseJSON.address const addressFromIssuer = getAddressFromDID(payload.iss) Eif (nameOwningAddress === addressFromIssuer) { return true } else { return false } } else { return false } }) }).catch(() => false) } /** * Checks if the if the token issuance time and date is after the * current time and date. * * @param {String} token encoded and signed authentication token * @return {Boolean} `true` if the token was issued after the current time, * otherwise returns `false` * @private */ export function isIssuanceDateValid(token: string) { const payload = decodeToken(token).payload Eif (payload.iat) { Iif (typeof payload.iat !== 'number') { return false } const issuedAt = new Date(payload.iat * 1000) // JWT times are in seconds Iif (new Date().getTime() < issuedAt.getTime()) { return false } else { return true } } else { return true } } /** * Checks if the expiration date of the `token` is before the current time * @param {String} token encoded and signed authentication token * @return {Boolean} `true` if the `token` has not yet expired, `false` * if the `token` has expired * * @private */ export function isExpirationDateValid(token: string) { const payload = decodeToken(token).payload Eif (payload.exp) { Iif (typeof payload.exp !== 'number') { return false } const expiresAt = new Date(payload.exp * 1000) // JWT times are in seconds Iif (new Date().getTime() > expiresAt.getTime()) { return false } else { return true } } else { return true } } /** * Makes sure the `manifest_uri` is a same origin absolute URL. * @param {String} token encoded and signed authentication token * @return {Boolean} `true` if valid, otherwise `false` * @private */ export function isManifestUriValid(token: string) { const payload = decodeToken(token).payload return isSameOriginAbsoluteUrl(payload.domain_name, payload.manifest_uri) } /** * Makes sure the `redirect_uri` is a same origin absolute URL. * @param {String} token encoded and signed authentication token * @return {Boolean} `true` if valid, otherwise `false` * @private */ export function isRedirectUriValid(token: string) { const payload = decodeToken(token).payload return isSameOriginAbsoluteUrl(payload.domain_name, payload.redirect_uri) } /** * Verify authentication request is valid. This function performs a number * of checks on the authentication request token: * * Checks that `token` has a valid issuance date & is not expired * * Checks that `token` has a valid signature that matches the public key it claims * * Checks that both the manifest and redirect URLs are absolute and conform to * the same origin policy * * @param {String} token encoded and signed authentication request token * @return {Promise} that resolves to true if the auth request * is valid and false if it does not. It rejects with a String if the * token is not signed * @private */ export function verifyAuthRequest(token: string) { return Promise.resolve().then(() => { Iif (decodeToken(token).header.alg === 'none') { throw new Error('Token must be signed in order to be verified') } }).then(() => Promise.all([ isExpirationDateValid(token), isIssuanceDateValid(token), doSignaturesMatchPublicKeys(token), doPublicKeysMatchIssuer(token), isManifestUriValid(token), isRedirectUriValid(token) ])).then((values) => { if (values.every(Boolean)) { return true } else { return false } }) } /** * Verify the authentication request is valid and * fetch the app manifest file if valid. Otherwise, reject the promise. * @param {String} token encoded and signed authentication request token * @return {Promise} that resolves to the app manifest file in JSON format * or rejects if the auth request or app manifest file is invalid * @private */ export function verifyAuthRequestAndLoadManifest(token: string) { return Promise.resolve().then(() => verifyAuthRequest(token) .then((valid) => { if (valid) { return fetchAppManifest(token) } else { return Promise.reject() } })) } /** * Verify the authentication response is valid * @param {String} token the authentication response token * @param {String} nameLookupURL the url use to verify owner of a username * @return {Promise} that resolves to true if auth response * is valid and false if it does not * @private */ export function verifyAuthResponse(token: string, nameLookupURL: string) { return Promise.all([ isExpirationDateValid(token), isIssuanceDateValid(token), doSignaturesMatchPublicKeys(token), doPublicKeysMatchIssuer(token), doPublicKeysMatchUsername(token, nameLookupURL) ]).then((values) => { Eif (values.every(Boolean)) { return true } else { return false } }) } |