diff options
Diffstat (limited to 'sandbox/testAppNevena/Front/node_modules/ssri/index.js')
| -rw-r--r-- | sandbox/testAppNevena/Front/node_modules/ssri/index.js | 470 |
1 files changed, 470 insertions, 0 deletions
diff --git a/sandbox/testAppNevena/Front/node_modules/ssri/index.js b/sandbox/testAppNevena/Front/node_modules/ssri/index.js new file mode 100644 index 00000000..2b309849 --- /dev/null +++ b/sandbox/testAppNevena/Front/node_modules/ssri/index.js @@ -0,0 +1,470 @@ +'use strict' + +const crypto = require('crypto') +const MiniPass = require('minipass') + +const SPEC_ALGORITHMS = ['sha256', 'sha384', 'sha512'] + +// TODO: this should really be a hardcoded list of algorithms we support, +// rather than [a-z0-9]. +const BASE64_REGEX = /^[a-z0-9+/]+(?:=?=?)$/i +const SRI_REGEX = /^([a-z0-9]+)-([^?]+)([?\S*]*)$/ +const STRICT_SRI_REGEX = /^([a-z0-9]+)-([A-Za-z0-9+/=]{44,88})(\?[\x21-\x7E]*)?$/ +const VCHAR_REGEX = /^[\x21-\x7E]+$/ + +const defaultOpts = { + algorithms: ['sha512'], + error: false, + options: [], + pickAlgorithm: getPrioritizedHash, + sep: ' ', + single: false, + strict: false +} + +const ssriOpts = (opts = {}) => ({ ...defaultOpts, ...opts }) + +const getOptString = options => !options || !options.length + ? '' + : `?${options.join('?')}` + +const _onEnd = Symbol('_onEnd') +const _getOptions = Symbol('_getOptions') +class IntegrityStream extends MiniPass { + constructor (opts) { + super() + this.size = 0 + this.opts = opts + + // may be overridden later, but set now for class consistency + this[_getOptions]() + + // options used for calculating stream. can't be changed. + const { algorithms = defaultOpts.algorithms } = opts + this.algorithms = Array.from( + new Set(algorithms.concat(this.algorithm ? [this.algorithm] : [])) + ) + this.hashes = this.algorithms.map(crypto.createHash) + } + + [_getOptions] () { + const { + integrity, + size, + options + } = { ...defaultOpts, ...this.opts } + + // For verification + this.sri = integrity ? parse(integrity, this.opts) : null + this.expectedSize = size + this.goodSri = this.sri ? !!Object.keys(this.sri).length : false + this.algorithm = this.goodSri ? this.sri.pickAlgorithm(this.opts) : null + this.digests = this.goodSri ? this.sri[this.algorithm] : null + this.optString = getOptString(options) + } + + emit (ev, data) { + if (ev === 'end') this[_onEnd]() + return super.emit(ev, data) + } + + write (data) { + this.size += data.length + this.hashes.forEach(h => h.update(data)) + return super.write(data) + } + + [_onEnd] () { + if (!this.goodSri) { + this[_getOptions]() + } + const newSri = parse(this.hashes.map((h, i) => { + return `${this.algorithms[i]}-${h.digest('base64')}${this.optString}` + }).join(' '), this.opts) + // Integrity verification mode + const match = this.goodSri && newSri.match(this.sri, this.opts) + if (typeof this.expectedSize === 'number' && this.size !== this.expectedSize) { + const err = new Error(`stream size mismatch when checking ${this.sri}.\n Wanted: ${this.expectedSize}\n Found: ${this.size}`) + err.code = 'EBADSIZE' + err.found = this.size + err.expected = this.expectedSize + err.sri = this.sri + this.emit('error', err) + } else if (this.sri && !match) { + const err = new Error(`${this.sri} integrity checksum failed when using ${this.algorithm}: wanted ${this.digests} but got ${newSri}. (${this.size} bytes)`) + err.code = 'EINTEGRITY' + err.found = newSri + err.expected = this.digests + err.algorithm = this.algorithm + err.sri = this.sri + this.emit('error', err) + } else { + this.emit('size', this.size) + this.emit('integrity', newSri) + match && this.emit('verified', match) + } + } +} + +class Hash { + get isHash () { return true } + constructor (hash, opts) { + opts = ssriOpts(opts) + const strict = !!opts.strict + this.source = hash.trim() + + // set default values so that we make V8 happy to + // always see a familiar object template. + this.digest = '' + this.algorithm = '' + this.options = [] + + // 3.1. Integrity metadata (called "Hash" by ssri) + // https://w3c.github.io/webappsec-subresource-integrity/#integrity-metadata-description + const match = this.source.match( + strict + ? STRICT_SRI_REGEX + : SRI_REGEX + ) + if (!match) { return } + if (strict && !SPEC_ALGORITHMS.some(a => a === match[1])) { return } + this.algorithm = match[1] + this.digest = match[2] + + const rawOpts = match[3] + if (rawOpts) { + this.options = rawOpts.slice(1).split('?') + } + } + + hexDigest () { + return this.digest && Buffer.from(this.digest, 'base64').toString('hex') + } + + toJSON () { + return this.toString() + } + + toString (opts) { + opts = ssriOpts(opts) + if (opts.strict) { + // Strict mode enforces the standard as close to the foot of the + // letter as it can. + if (!( + // The spec has very restricted productions for algorithms. + // https://www.w3.org/TR/CSP2/#source-list-syntax + SPEC_ALGORITHMS.some(x => x === this.algorithm) && + // Usually, if someone insists on using a "different" base64, we + // leave it as-is, since there's multiple standards, and the + // specified is not a URL-safe variant. + // https://www.w3.org/TR/CSP2/#base64_value + this.digest.match(BASE64_REGEX) && + // Option syntax is strictly visual chars. + // https://w3c.github.io/webappsec-subresource-integrity/#grammardef-option-expression + // https://tools.ietf.org/html/rfc5234#appendix-B.1 + this.options.every(opt => opt.match(VCHAR_REGEX)) + )) { + return '' + } + } + const options = this.options && this.options.length + ? `?${this.options.join('?')}` + : '' + return `${this.algorithm}-${this.digest}${options}` + } +} + +class Integrity { + get isIntegrity () { return true } + toJSON () { + return this.toString() + } + + isEmpty () { + return Object.keys(this).length === 0 + } + + toString (opts) { + opts = ssriOpts(opts) + let sep = opts.sep || ' ' + if (opts.strict) { + // Entries must be separated by whitespace, according to spec. + sep = sep.replace(/\S+/g, ' ') + } + return Object.keys(this).map(k => { + return this[k].map(hash => { + return Hash.prototype.toString.call(hash, opts) + }).filter(x => x.length).join(sep) + }).filter(x => x.length).join(sep) + } + + concat (integrity, opts) { + opts = ssriOpts(opts) + const other = typeof integrity === 'string' + ? integrity + : stringify(integrity, opts) + return parse(`${this.toString(opts)} ${other}`, opts) + } + + hexDigest () { + return parse(this, { single: true }).hexDigest() + } + + // add additional hashes to an integrity value, but prevent + // *changing* an existing integrity hash. + merge (integrity, opts) { + opts = ssriOpts(opts) + const other = parse(integrity, opts) + for (const algo in other) { + if (this[algo]) { + if (!this[algo].find(hash => + other[algo].find(otherhash => + hash.digest === otherhash.digest))) { + throw new Error('hashes do not match, cannot update integrity') + } + } else { + this[algo] = other[algo] + } + } + } + + match (integrity, opts) { + opts = ssriOpts(opts) + const other = parse(integrity, opts) + const algo = other.pickAlgorithm(opts) + return ( + this[algo] && + other[algo] && + this[algo].find(hash => + other[algo].find(otherhash => + hash.digest === otherhash.digest + ) + ) + ) || false + } + + pickAlgorithm (opts) { + opts = ssriOpts(opts) + const pickAlgorithm = opts.pickAlgorithm + const keys = Object.keys(this) + return keys.reduce((acc, algo) => { + return pickAlgorithm(acc, algo) || acc + }) + } +} + +module.exports.parse = parse +function parse (sri, opts) { + if (!sri) return null + opts = ssriOpts(opts) + if (typeof sri === 'string') { + return _parse(sri, opts) + } else if (sri.algorithm && sri.digest) { + const fullSri = new Integrity() + fullSri[sri.algorithm] = [sri] + return _parse(stringify(fullSri, opts), opts) + } else { + return _parse(stringify(sri, opts), opts) + } +} + +function _parse (integrity, opts) { + // 3.4.3. Parse metadata + // https://w3c.github.io/webappsec-subresource-integrity/#parse-metadata + if (opts.single) { + return new Hash(integrity, opts) + } + const hashes = integrity.trim().split(/\s+/).reduce((acc, string) => { + const hash = new Hash(string, opts) + if (hash.algorithm && hash.digest) { + const algo = hash.algorithm + if (!acc[algo]) { acc[algo] = [] } + acc[algo].push(hash) + } + return acc + }, new Integrity()) + return hashes.isEmpty() ? null : hashes +} + +module.exports.stringify = stringify +function stringify (obj, opts) { + opts = ssriOpts(opts) + if (obj.algorithm && obj.digest) { + return Hash.prototype.toString.call(obj, opts) + } else if (typeof obj === 'string') { + return stringify(parse(obj, opts), opts) + } else { + return Integrity.prototype.toString.call(obj, opts) + } +} + +module.exports.fromHex = fromHex +function fromHex (hexDigest, algorithm, opts) { + opts = ssriOpts(opts) + const optString = getOptString(opts.options) + return parse( + `${algorithm}-${ + Buffer.from(hexDigest, 'hex').toString('base64') + }${optString}`, opts + ) +} + +module.exports.fromData = fromData +function fromData (data, opts) { + opts = ssriOpts(opts) + const algorithms = opts.algorithms + const optString = getOptString(opts.options) + return algorithms.reduce((acc, algo) => { + const digest = crypto.createHash(algo).update(data).digest('base64') + const hash = new Hash( + `${algo}-${digest}${optString}`, + opts + ) + /* istanbul ignore else - it would be VERY strange if the string we + * just calculated with an algo did not have an algo or digest. + */ + if (hash.algorithm && hash.digest) { + const algo = hash.algorithm + if (!acc[algo]) { acc[algo] = [] } + acc[algo].push(hash) + } + return acc + }, new Integrity()) +} + +module.exports.fromStream = fromStream +function fromStream (stream, opts) { + opts = ssriOpts(opts) + const istream = integrityStream(opts) + return new Promise((resolve, reject) => { + stream.pipe(istream) + stream.on('error', reject) + istream.on('error', reject) + let sri + istream.on('integrity', s => { sri = s }) + istream.on('end', () => resolve(sri)) + istream.on('data', () => {}) + }) +} + +module.exports.checkData = checkData +function checkData (data, sri, opts) { + opts = ssriOpts(opts) + sri = parse(sri, opts) + if (!sri || !Object.keys(sri).length) { + if (opts.error) { + throw Object.assign( + new Error('No valid integrity hashes to check against'), { + code: 'EINTEGRITY' + } + ) + } else { + return false + } + } + const algorithm = sri.pickAlgorithm(opts) + const digest = crypto.createHash(algorithm).update(data).digest('base64') + const newSri = parse({ algorithm, digest }) + const match = newSri.match(sri, opts) + if (match || !opts.error) { + return match + } else if (typeof opts.size === 'number' && (data.length !== opts.size)) { + const err = new Error(`data size mismatch when checking ${sri}.\n Wanted: ${opts.size}\n Found: ${data.length}`) + err.code = 'EBADSIZE' + err.found = data.length + err.expected = opts.size + err.sri = sri + throw err + } else { + const err = new Error(`Integrity checksum failed when using ${algorithm}: Wanted ${sri}, but got ${newSri}. (${data.length} bytes)`) + err.code = 'EINTEGRITY' + err.found = newSri + err.expected = sri + err.algorithm = algorithm + err.sri = sri + throw err + } +} + +module.exports.checkStream = checkStream +function checkStream (stream, sri, opts) { + opts = ssriOpts(opts) + opts.integrity = sri + sri = parse(sri, opts) + if (!sri || !Object.keys(sri).length) { + return Promise.reject(Object.assign( + new Error('No valid integrity hashes to check against'), { + code: 'EINTEGRITY' + } + )) + } + const checker = integrityStream(opts) + return new Promise((resolve, reject) => { + stream.pipe(checker) + stream.on('error', reject) + checker.on('error', reject) + let sri + checker.on('verified', s => { sri = s }) + checker.on('end', () => resolve(sri)) + checker.on('data', () => {}) + }) +} + +module.exports.integrityStream = integrityStream +function integrityStream (opts = {}) { + return new IntegrityStream(opts) +} + +module.exports.create = createIntegrity +function createIntegrity (opts) { + opts = ssriOpts(opts) + const algorithms = opts.algorithms + const optString = getOptString(opts.options) + + const hashes = algorithms.map(crypto.createHash) + + return { + update: function (chunk, enc) { + hashes.forEach(h => h.update(chunk, enc)) + return this + }, + digest: function (enc) { + const integrity = algorithms.reduce((acc, algo) => { + const digest = hashes.shift().digest('base64') + const hash = new Hash( + `${algo}-${digest}${optString}`, + opts + ) + /* istanbul ignore else - it would be VERY strange if the hash we + * just calculated with an algo did not have an algo or digest. + */ + if (hash.algorithm && hash.digest) { + const algo = hash.algorithm + if (!acc[algo]) { acc[algo] = [] } + acc[algo].push(hash) + } + return acc + }, new Integrity()) + + return integrity + } + } +} + +const NODE_HASHES = new Set(crypto.getHashes()) + +// This is a Best Effort™ at a reasonable priority for hash algos +const DEFAULT_PRIORITY = [ + 'md5', 'whirlpool', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512', + // TODO - it's unclear _which_ of these Node will actually use as its name + // for the algorithm, so we guesswork it based on the OpenSSL names. + 'sha3', + 'sha3-256', 'sha3-384', 'sha3-512', + 'sha3_256', 'sha3_384', 'sha3_512' +].filter(algo => NODE_HASHES.has(algo)) + +function getPrioritizedHash (algo1, algo2) { + return DEFAULT_PRIORITY.indexOf(algo1.toLowerCase()) >= DEFAULT_PRIORITY.indexOf(algo2.toLowerCase()) + ? algo1 + : algo2 +} |