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41f2ebae | 1 | import { Request } from 'express' |
74dc3bca | 2 | import { BCRYPT_SALT_SIZE, HTTP_SIGNATURE, PRIVATE_RSA_KEY_SIZE } from '../initializers/constants' |
8d2be0ed | 3 | import { createPrivateKey, getPublicKey, promisify1, promisify2, sha256 } from './core-utils' |
ad513607 | 4 | import { jsonld } from './custom-jsonld-signature' |
8d468a16 | 5 | import { logger } from './logger' |
df66d815 | 6 | import { cloneDeep } from 'lodash' |
ad513607 | 7 | import { createSign, createVerify } from 'crypto' |
8d2be0ed | 8 | import * as bcrypt from 'bcrypt' |
453e83ea | 9 | import { MActor } from '../typings/models' |
8d2be0ed C |
10 | |
11 | const bcryptComparePromise = promisify2<any, string, boolean>(bcrypt.compare) | |
12 | const bcryptGenSaltPromise = promisify1<number, string>(bcrypt.genSalt) | |
13 | const bcryptHashPromise = promisify2<any, string | number, string>(bcrypt.hash) | |
9f10b292 | 14 | |
41f2ebae C |
15 | const httpSignature = require('http-signature') |
16 | ||
e4f97bab C |
17 | async function createPrivateAndPublicKeys () { |
18 | logger.info('Generating a RSA key...') | |
bdfbd4f1 | 19 | |
e4f97bab C |
20 | const { key } = await createPrivateKey(PRIVATE_RSA_KEY_SIZE) |
21 | const { publicKey } = await getPublicKey(key) | |
bdfbd4f1 | 22 | |
e4f97bab | 23 | return { privateKey: key, publicKey } |
9f10b292 C |
24 | } |
25 | ||
41f2ebae C |
26 | // User password checks |
27 | ||
28 | function comparePassword (plainPassword: string, hashPassword: string) { | |
29 | return bcryptComparePromise(plainPassword, hashPassword) | |
30 | } | |
31 | ||
32 | async function cryptPassword (password: string) { | |
33 | const salt = await bcryptGenSaltPromise(BCRYPT_SALT_SIZE) | |
34 | ||
35 | return bcryptHashPromise(password, salt) | |
36 | } | |
37 | ||
38 | // HTTP Signature | |
39 | ||
df66d815 C |
40 | function isHTTPSignatureDigestValid (rawBody: Buffer, req: Request): boolean { |
41 | if (req.headers[HTTP_SIGNATURE.HEADER_NAME] && req.headers['digest']) { | |
42 | return buildDigest(rawBody.toString()) === req.headers['digest'] | |
43 | } | |
44 | ||
45 | return true | |
46 | } | |
47 | ||
453e83ea | 48 | function isHTTPSignatureVerified (httpSignatureParsed: any, actor: MActor): boolean { |
41f2ebae C |
49 | return httpSignature.verifySignature(httpSignatureParsed, actor.publicKey) === true |
50 | } | |
51 | ||
df66d815 | 52 | function parseHTTPSignature (req: Request, clockSkew?: number) { |
e9226905 | 53 | return httpSignature.parse(req, { clockSkew }) |
41f2ebae C |
54 | } |
55 | ||
56 | // JSONLD | |
57 | ||
ad513607 | 58 | function isJsonLDSignatureVerified (fromActor: MActor, signedDocument: any): Promise<boolean> { |
df66d815 | 59 | if (signedDocument.signature.type === 'RsaSignature2017') { |
ad513607 | 60 | return isJsonLDRSA2017Verified(fromActor, signedDocument) |
df66d815 C |
61 | } |
62 | ||
ad513607 | 63 | logger.warn('Unknown JSON LD signature %s.', signedDocument.signature.type, signedDocument) |
bdfbd4f1 | 64 | |
ad513607 | 65 | return Promise.resolve(false) |
26d7d31b C |
66 | } |
67 | ||
df66d815 | 68 | // Backward compatibility with "other" implementations |
453e83ea | 69 | async function isJsonLDRSA2017Verified (fromActor: MActor, signedDocument: any) { |
df66d815 | 70 | const [ documentHash, optionsHash ] = await Promise.all([ |
ad513607 C |
71 | createDocWithoutSignatureHash(signedDocument), |
72 | createSignatureHash(signedDocument.signature) | |
df66d815 C |
73 | ]) |
74 | ||
75 | const toVerify = optionsHash + documentHash | |
76 | ||
77 | const verify = createVerify('RSA-SHA256') | |
78 | verify.update(toVerify, 'utf8') | |
79 | ||
80 | return verify.verify(fromActor.publicKey, signedDocument.signature.signatureValue, 'base64') | |
81 | } | |
82 | ||
ad513607 C |
83 | async function signJsonLDObject (byActor: MActor, data: any) { |
84 | const signature = { | |
85 | type: 'RsaSignature2017', | |
ce33ee01 | 86 | creator: byActor.url, |
ad513607 | 87 | created: new Date().toISOString() |
f5028693 | 88 | } |
9f10b292 | 89 | |
ad513607 C |
90 | const [ documentHash, optionsHash ] = await Promise.all([ |
91 | createDocWithoutSignatureHash(data), | |
92 | createSignatureHash(signature) | |
93 | ]) | |
94 | ||
95 | const toSign = optionsHash + documentHash | |
96 | ||
97 | const sign = createSign('RSA-SHA256') | |
98 | sign.update(toSign, 'utf8') | |
99 | ||
100 | const signatureValue = sign.sign(byActor.privateKey, 'base64') | |
101 | Object.assign(signature, { signatureValue }) | |
102 | ||
103 | return Object.assign(data, { signature }) | |
e4f97bab C |
104 | } |
105 | ||
8dc8a34e C |
106 | function buildDigest (body: any) { |
107 | const rawBody = typeof body === 'string' ? body : JSON.stringify(body) | |
108 | ||
109 | return 'SHA-256=' + sha256(rawBody, 'base64') | |
110 | } | |
111 | ||
9f10b292 | 112 | // --------------------------------------------------------------------------- |
dac0a531 | 113 | |
65fcc311 | 114 | export { |
df66d815 | 115 | isHTTPSignatureDigestValid, |
41f2ebae C |
116 | parseHTTPSignature, |
117 | isHTTPSignatureVerified, | |
8dc8a34e | 118 | buildDigest, |
41f2ebae | 119 | isJsonLDSignatureVerified, |
65fcc311 | 120 | comparePassword, |
e4f97bab | 121 | createPrivateAndPublicKeys, |
65fcc311 | 122 | cryptPassword, |
41f2ebae | 123 | signJsonLDObject |
9f10b292 | 124 | } |
8d2be0ed C |
125 | |
126 | // --------------------------------------------------------------------------- | |
ad513607 C |
127 | |
128 | function hash (obj: any): Promise<any> { | |
129 | return jsonld.promises | |
130 | .normalize(obj, { | |
131 | algorithm: 'URDNA2015', | |
132 | format: 'application/n-quads' | |
133 | }) | |
134 | .then(res => sha256(res)) | |
135 | } | |
136 | ||
137 | function createSignatureHash (signature: any) { | |
138 | const signatureCopy = cloneDeep(signature) | |
139 | Object.assign(signatureCopy, { | |
140 | '@context': [ | |
141 | 'https://w3id.org/security/v1', | |
142 | { RsaSignature2017: 'https://w3id.org/security#RsaSignature2017' } | |
143 | ] | |
144 | }) | |
145 | ||
146 | delete signatureCopy.type | |
147 | delete signatureCopy.id | |
148 | delete signatureCopy.signatureValue | |
149 | ||
150 | return hash(signatureCopy) | |
151 | } | |
152 | ||
153 | function createDocWithoutSignatureHash (doc: any) { | |
154 | const docWithoutSignature = cloneDeep(doc) | |
155 | delete docWithoutSignature.signature | |
156 | ||
157 | return hash(docWithoutSignature) | |
158 | } |