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const fetch = require('npm-registry-fetch')
const localeCompare = require('@isaacs/string-locale-compare')('en')
const npa = require('npm-package-arg')
const pacote = require('pacote')
const pMap = require('p-map')
const tufClient = require('@sigstore/tuf')
const { log, output } = require('proc-log')
const sortAlphabetically = (a, b) => localeCompare(a.name, b.name)
class VerifySignatures {
constructor (tree, filterSet, npm, opts) {
this.tree = tree
this.filterSet = filterSet
this.npm = npm
this.opts = opts
this.keys = new Map()
this.invalid = []
this.missing = []
this.checkedPackages = new Set()
this.auditedWithKeysCount = 0
this.verifiedSignatureCount = 0
this.verifiedAttestationCount = 0
this.exitCode = 0
}
async run () {
const start = process.hrtime.bigint()
// Find all deps in tree
const { edges, registries } = this.getEdgesOut(this.tree.inventory.values(), this.filterSet)
if (edges.size === 0) {
throw new Error('found no installed dependencies to audit')
}
const tuf = await tufClient.initTUF({
cachePath: this.opts.tufCache,
retry: this.opts.retry,
timeout: this.opts.timeout,
})
await Promise.all([...registries].map(registry => this.setKeys({ registry, tuf })))
log.verbose('verifying registry signatures')
await pMap(edges, (e) => this.getVerifiedInfo(e), { concurrency: 20, stopOnError: true })
// Didn't find any dependencies that could be verified, e.g. only local
// deps, missing version, not on a registry etc.
if (!this.auditedWithKeysCount) {
throw new Error('found no dependencies to audit that were installed from ' +
'a supported registry')
}
const invalid = this.invalid.sort(sortAlphabetically)
const missing = this.missing.sort(sortAlphabetically)
const hasNoInvalidOrMissing = invalid.length === 0 && missing.length === 0
if (!hasNoInvalidOrMissing) {
process.exitCode = 1
}
if (this.npm.config.get('json')) {
output.buffer({ invalid, missing })
return
}
const end = process.hrtime.bigint()
const elapsed = end - start
const auditedPlural = this.auditedWithKeysCount > 1 ? 's' : ''
const timing = `audited ${this.auditedWithKeysCount} package${auditedPlural} in ` +
`${Math.floor(Number(elapsed) / 1e9)}s`
output.standard(timing)
output.standard('')
const verifiedBold = this.npm.chalk.bold('verified')
if (this.verifiedSignatureCount) {
if (this.verifiedSignatureCount === 1) {
/* eslint-disable-next-line max-len */
output.standard(`${this.verifiedSignatureCount} package has a ${verifiedBold} registry signature`)
} else {
/* eslint-disable-next-line max-len */
output.standard(`${this.verifiedSignatureCount} packages have ${verifiedBold} registry signatures`)
}
output.standard('')
}
if (this.verifiedAttestationCount) {
if (this.verifiedAttestationCount === 1) {
/* eslint-disable-next-line max-len */
output.standard(`${this.verifiedAttestationCount} package has a ${verifiedBold} attestation`)
} else {
/* eslint-disable-next-line max-len */
output.standard(`${this.verifiedAttestationCount} packages have ${verifiedBold} attestations`)
}
output.standard('')
}
if (missing.length) {
const missingClr = this.npm.chalk.redBright('missing')
if (missing.length === 1) {
/* eslint-disable-next-line max-len */
output.standard(`1 package has a ${missingClr} registry signature but the registry is providing signing keys:`)
} else {
/* eslint-disable-next-line max-len */
output.standard(`${missing.length} packages have ${missingClr} registry signatures but the registry is providing signing keys:`)
}
output.standard('')
missing.map(m =>
output.standard(`${this.npm.chalk.red(`${m.name}@${m.version}`)} (${m.registry})`)
)
}
if (invalid.length) {
if (missing.length) {
output.standard('')
}
const invalidClr = this.npm.chalk.redBright('invalid')
// We can have either invalid signatures or invalid provenance
const invalidSignatures = this.invalid.filter(i => i.code === 'EINTEGRITYSIGNATURE')
if (invalidSignatures.length) {
if (invalidSignatures.length === 1) {
output.standard(`1 package has an ${invalidClr} registry signature:`)
} else {
/* eslint-disable-next-line max-len */
output.standard(`${invalidSignatures.length} packages have ${invalidClr} registry signatures:`)
}
output.standard('')
invalidSignatures.map(i =>
output.standard(`${this.npm.chalk.red(`${i.name}@${i.version}`)} (${i.registry})`)
)
output.standard('')
}
const invalidAttestations = this.invalid.filter(i => i.code === 'EATTESTATIONVERIFY')
if (invalidAttestations.length) {
if (invalidAttestations.length === 1) {
output.standard(`1 package has an ${invalidClr} attestation:`)
} else {
/* eslint-disable-next-line max-len */
output.standard(`${invalidAttestations.length} packages have ${invalidClr} attestations:`)
}
output.standard('')
invalidAttestations.map(i =>
output.standard(`${this.npm.chalk.red(`${i.name}@${i.version}`)} (${i.registry})`)
)
output.standard('')
}
if (invalid.length === 1) {
/* eslint-disable-next-line max-len */
output.standard(`Someone might have tampered with this package since it was published on the registry!`)
} else {
/* eslint-disable-next-line max-len */
output.standard(`Someone might have tampered with these packages since they were published on the registry!`)
}
output.standard('')
}
}
getEdgesOut (nodes, filterSet) {
const edges = new Set()
const registries = new Set()
for (const node of nodes) {
for (const edge of node.edgesOut.values()) {
const filteredOut =
edge.from
&& filterSet
&& filterSet.size > 0
&& !filterSet.has(edge.from.target)
if (!filteredOut) {
const spec = this.getEdgeSpec(edge)
if (spec) {
// Prefetch and cache public keys from used registries
registries.add(this.getSpecRegistry(spec))
}
edges.add(edge)
}
}
}
return { edges, registries }
}
async setKeys ({ registry, tuf }) {
const { host, pathname } = new URL(registry)
// Strip any trailing slashes from pathname
const regKey = `${host}${pathname.replace(/\/$/, '')}/keys.json`
let keys = await tuf.getTarget(regKey)
.then((target) => JSON.parse(target))
.then(({ keys: ks }) => ks.map((key) => ({
...key,
keyid: key.keyId,
pemkey: `-----BEGIN PUBLIC KEY-----\n${key.publicKey.rawBytes}\n-----END PUBLIC KEY-----`,
expires: key.publicKey.validFor.end || null,
}))).catch(err => {
if (err.code === 'TUF_FIND_TARGET_ERROR') {
return null
} else {
throw err
}
})
// If keys not found in Sigstore TUF repo, fallback to registry keys API
if (!keys) {
keys = await fetch.json('/-/npm/v1/keys', {
...this.npm.flatOptions,
registry,
}).then(({ keys: ks }) => ks.map((key) => ({
...key,
pemkey: `-----BEGIN PUBLIC KEY-----\n${key.key}\n-----END PUBLIC KEY-----`,
}))).catch(err => {
if (err.code === 'E404' || err.code === 'E400') {
return null
} else {
throw err
}
})
}
if (keys) {
this.keys.set(registry, keys)
}
}
getEdgeType (edge) {
return edge.optional ? 'optionalDependencies'
: edge.peer ? 'peerDependencies'
: edge.dev ? 'devDependencies'
: 'dependencies'
}
getEdgeSpec (edge) {
let name = edge.name
try {
name = npa(edge.spec).subSpec.name
} catch {
// leave it as edge.name
}
try {
return npa(`${name}@${edge.spec}`)
} catch {
// Skip packages with invalid spec
}
}
buildRegistryConfig (registry) {
const keys = this.keys.get(registry) || []
const parsedRegistry = new URL(registry)
const regKey = `//${parsedRegistry.host}${parsedRegistry.pathname}`
return {
[`${regKey}:_keys`]: keys,
}
}
getSpecRegistry (spec) {
return fetch.pickRegistry(spec, this.npm.flatOptions)
}
getValidPackageInfo (edge) {
const type = this.getEdgeType(edge)
// Skip potentially optional packages that are not on disk, as these could
// be omitted during install
if (edge.error === 'MISSING' && type !== 'dependencies') {
return
}
const spec = this.getEdgeSpec(edge)
// Skip invalid version requirements
if (!spec) {
return
}
const node = edge.to || edge
const { version } = node.package || {}
if (node.isWorkspace || // Skip local workspaces packages
!version || // Skip packages that don't have a installed version, e.g. optonal dependencies
!spec.registry) { // Skip if not from registry, e.g. git package
return
}
for (const omitType of this.npm.config.get('omit')) {
if (node[omitType]) {
return
}
}
return {
name: spec.name,
version,
type,
location: node.location,
registry: this.getSpecRegistry(spec),
}
}
async verifySignatures (name, version, registry) {
const {
_integrity: integrity,
_signatures,
_attestations,
_resolved: resolved,
} = await pacote.manifest(`${name}@${version}`, {
verifySignatures: true,
verifyAttestations: true,
...this.buildRegistryConfig(registry),
...this.npm.flatOptions,
})
const signatures = _signatures || []
const result = {
integrity,
signatures,
attestations: _attestations,
resolved,
}
return result
}
async getVerifiedInfo (edge) {
const info = this.getValidPackageInfo(edge)
if (!info) {
return
}
const { name, version, location, registry, type } = info
if (this.checkedPackages.has(location)) {
// we already did or are doing this one
return
}
this.checkedPackages.add(location)
// We only "audit" or verify the signature, or the presence of it, on
// packages whose registry returns signing keys
const keys = this.keys.get(registry) || []
if (keys.length) {
this.auditedWithKeysCount += 1
}
try {
const { integrity, signatures, attestations, resolved } = await this.verifySignatures(
name, version, registry
)
// Currently we only care about missing signatures on registries that provide a public key
// We could make this configurable in the future with a strict/paranoid mode
if (signatures.length) {
this.verifiedSignatureCount += 1
} else if (keys.length) {
this.missing.push({
integrity,
location,
name,
registry,
resolved,
version,
})
}
// Track verified attestations separately to registry signatures, as all
// packages on registries with signing keys are expected to have registry
// signatures, but not all packages have provenance and publish attestations.
if (attestations) {
this.verifiedAttestationCount += 1
}
} catch (e) {
if (e.code === 'EINTEGRITYSIGNATURE' || e.code === 'EATTESTATIONVERIFY') {
this.invalid.push({
code: e.code,
message: e.message,
integrity: e.integrity,
keyid: e.keyid,
location,
name,
registry,
resolved: e.resolved,
signature: e.signature,
predicateType: e.predicateType,
type,
version,
})
} else {
throw e
}
}
}
}
module.exports = VerifySignatures