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1 | import { Request } from 'express' | |
2 | import { BCRYPT_SALT_SIZE, HTTP_SIGNATURE, PRIVATE_RSA_KEY_SIZE } from '../initializers/constants' | |
3 | import { ActorModel } from '../models/activitypub/actor' | |
4 | import { createPrivateKey, getPublicKey, promisify1, promisify2, sha256 } from './core-utils' | |
5 | import { jsig, jsonld } from './custom-jsonld-signature' | |
6 | import { logger } from './logger' | |
7 | import { cloneDeep } from 'lodash' | |
8 | import { createVerify } from 'crypto' | |
9 | import { buildDigest } from '../lib/job-queue/handlers/utils/activitypub-http-utils' | |
10 | import * as bcrypt from 'bcrypt' | |
11 | ||
12 | const bcryptComparePromise = promisify2<any, string, boolean>(bcrypt.compare) | |
13 | const bcryptGenSaltPromise = promisify1<number, string>(bcrypt.genSalt) | |
14 | const bcryptHashPromise = promisify2<any, string | number, string>(bcrypt.hash) | |
15 | ||
16 | const httpSignature = require('http-signature') | |
17 | ||
18 | async function createPrivateAndPublicKeys () { | |
19 | logger.info('Generating a RSA key...') | |
20 | ||
21 | const { key } = await createPrivateKey(PRIVATE_RSA_KEY_SIZE) | |
22 | const { publicKey } = await getPublicKey(key) | |
23 | ||
24 | return { privateKey: key, publicKey } | |
25 | } | |
26 | ||
27 | // User password checks | |
28 | ||
29 | function comparePassword (plainPassword: string, hashPassword: string) { | |
30 | return bcryptComparePromise(plainPassword, hashPassword) | |
31 | } | |
32 | ||
33 | async function cryptPassword (password: string) { | |
34 | const salt = await bcryptGenSaltPromise(BCRYPT_SALT_SIZE) | |
35 | ||
36 | return bcryptHashPromise(password, salt) | |
37 | } | |
38 | ||
39 | // HTTP Signature | |
40 | ||
41 | function isHTTPSignatureDigestValid (rawBody: Buffer, req: Request): boolean { | |
42 | if (req.headers[HTTP_SIGNATURE.HEADER_NAME] && req.headers['digest']) { | |
43 | return buildDigest(rawBody.toString()) === req.headers['digest'] | |
44 | } | |
45 | ||
46 | return true | |
47 | } | |
48 | ||
49 | function isHTTPSignatureVerified (httpSignatureParsed: any, actor: ActorModel): boolean { | |
50 | return httpSignature.verifySignature(httpSignatureParsed, actor.publicKey) === true | |
51 | } | |
52 | ||
53 | function parseHTTPSignature (req: Request, clockSkew?: number) { | |
54 | return httpSignature.parse(req, { authorizationHeaderName: HTTP_SIGNATURE.HEADER_NAME, clockSkew }) | |
55 | } | |
56 | ||
57 | // JSONLD | |
58 | ||
59 | async function isJsonLDSignatureVerified (fromActor: ActorModel, signedDocument: any): Promise<boolean> { | |
60 | if (signedDocument.signature.type === 'RsaSignature2017') { | |
61 | // Mastodon algorithm | |
62 | const res = await isJsonLDRSA2017Verified(fromActor, signedDocument) | |
63 | // Success? If no, try with our library | |
64 | if (res === true) return true | |
65 | } | |
66 | ||
67 | const publicKeyObject = { | |
68 | '@context': jsig.SECURITY_CONTEXT_URL, | |
69 | id: fromActor.url, | |
70 | type: 'CryptographicKey', | |
71 | owner: fromActor.url, | |
72 | publicKeyPem: fromActor.publicKey | |
73 | } | |
74 | ||
75 | const publicKeyOwnerObject = { | |
76 | '@context': jsig.SECURITY_CONTEXT_URL, | |
77 | id: fromActor.url, | |
78 | publicKey: [ publicKeyObject ] | |
79 | } | |
80 | ||
81 | const options = { | |
82 | publicKey: publicKeyObject, | |
83 | publicKeyOwner: publicKeyOwnerObject | |
84 | } | |
85 | ||
86 | return jsig.promises | |
87 | .verify(signedDocument, options) | |
88 | .then((result: { verified: boolean }) => result.verified) | |
89 | .catch(err => { | |
90 | logger.error('Cannot check signature.', { err }) | |
91 | return false | |
92 | }) | |
93 | } | |
94 | ||
95 | // Backward compatibility with "other" implementations | |
96 | async function isJsonLDRSA2017Verified (fromActor: ActorModel, signedDocument: any) { | |
97 | function hash (obj: any): Promise<any> { | |
98 | return jsonld.promises | |
99 | .normalize(obj, { | |
100 | algorithm: 'URDNA2015', | |
101 | format: 'application/n-quads' | |
102 | }) | |
103 | .then(res => sha256(res)) | |
104 | } | |
105 | ||
106 | const signatureCopy = cloneDeep(signedDocument.signature) | |
107 | Object.assign(signatureCopy, { | |
108 | '@context': [ | |
109 | 'https://w3id.org/security/v1', | |
110 | { RsaSignature2017: 'https://w3id.org/security#RsaSignature2017' } | |
111 | ] | |
112 | }) | |
113 | delete signatureCopy.type | |
114 | delete signatureCopy.id | |
115 | delete signatureCopy.signatureValue | |
116 | ||
117 | const docWithoutSignature = cloneDeep(signedDocument) | |
118 | delete docWithoutSignature.signature | |
119 | ||
120 | const [ documentHash, optionsHash ] = await Promise.all([ | |
121 | hash(docWithoutSignature), | |
122 | hash(signatureCopy) | |
123 | ]) | |
124 | ||
125 | const toVerify = optionsHash + documentHash | |
126 | ||
127 | const verify = createVerify('RSA-SHA256') | |
128 | verify.update(toVerify, 'utf8') | |
129 | ||
130 | return verify.verify(fromActor.publicKey, signedDocument.signature.signatureValue, 'base64') | |
131 | } | |
132 | ||
133 | function signJsonLDObject (byActor: ActorModel, data: any) { | |
134 | const options = { | |
135 | privateKeyPem: byActor.privateKey, | |
136 | creator: byActor.url, | |
137 | algorithm: 'RsaSignature2017' | |
138 | } | |
139 | ||
140 | return jsig.promises.sign(data, options) | |
141 | } | |
142 | ||
143 | // --------------------------------------------------------------------------- | |
144 | ||
145 | export { | |
146 | isHTTPSignatureDigestValid, | |
147 | parseHTTPSignature, | |
148 | isHTTPSignatureVerified, | |
149 | isJsonLDSignatureVerified, | |
150 | comparePassword, | |
151 | createPrivateAndPublicKeys, | |
152 | cryptPassword, | |
153 | signJsonLDObject | |
154 | } | |
155 | ||
156 | // --------------------------------------------------------------------------- |