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1 | import { NextFunction, Request, Response } from 'express' | |
2 | import { getAPId } from '@server/helpers/activitypub' | |
3 | import { isActorDeleteActivityValid } from '@server/helpers/custom-validators/activitypub/actor' | |
4 | import { ActivityDelete, ActivityPubSignature } from '../../shared' | |
5 | import { HttpStatusCode } from '../../shared/models/http/http-error-codes' | |
6 | import { logger } from '../helpers/logger' | |
7 | import { isHTTPSignatureVerified, isJsonLDSignatureVerified, parseHTTPSignature } from '../helpers/peertube-crypto' | |
8 | import { ACCEPT_HEADERS, ACTIVITY_PUB, HTTP_SIGNATURE } from '../initializers/constants' | |
9 | import { getOrCreateAPActor, loadActorUrlOrGetFromWebfinger } from '../lib/activitypub/actors' | |
10 | ||
11 | async function checkSignature (req: Request, res: Response, next: NextFunction) { | |
12 | try { | |
13 | const httpSignatureChecked = await checkHttpSignature(req, res) | |
14 | if (httpSignatureChecked !== true) return | |
15 | ||
16 | const actor = res.locals.signature.actor | |
17 | ||
18 | // Forwarded activity | |
19 | const bodyActor = req.body.actor | |
20 | const bodyActorId = getAPId(bodyActor) | |
21 | if (bodyActorId && bodyActorId !== actor.url) { | |
22 | const jsonLDSignatureChecked = await checkJsonLDSignature(req, res) | |
23 | if (jsonLDSignatureChecked !== true) return | |
24 | } | |
25 | ||
26 | return next() | |
27 | } catch (err) { | |
28 | const activity: ActivityDelete = req.body | |
29 | if (isActorDeleteActivityValid(activity) && activity.object === activity.actor) { | |
30 | logger.debug('Handling signature error on actor delete activity', { err }) | |
31 | return res.status(HttpStatusCode.NO_CONTENT_204).end() | |
32 | } | |
33 | ||
34 | logger.warn('Error in ActivityPub signature checker.', { err }) | |
35 | return res.fail({ | |
36 | status: HttpStatusCode.FORBIDDEN_403, | |
37 | message: 'ActivityPub signature could not be checked' | |
38 | }) | |
39 | } | |
40 | } | |
41 | ||
42 | function executeIfActivityPub (req: Request, res: Response, next: NextFunction) { | |
43 | const accepted = req.accepts(ACCEPT_HEADERS) | |
44 | if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.includes(accepted) === false) { | |
45 | // Bypass this route | |
46 | return next('route') | |
47 | } | |
48 | ||
49 | logger.debug('ActivityPub request for %s.', req.url) | |
50 | ||
51 | return next() | |
52 | } | |
53 | ||
54 | // --------------------------------------------------------------------------- | |
55 | ||
56 | export { | |
57 | checkSignature, | |
58 | executeIfActivityPub, | |
59 | checkHttpSignature | |
60 | } | |
61 | ||
62 | // --------------------------------------------------------------------------- | |
63 | ||
64 | async function checkHttpSignature (req: Request, res: Response) { | |
65 | // FIXME: compatibility with http-signature < v1.3 | |
66 | const sig = req.headers[HTTP_SIGNATURE.HEADER_NAME] as string | |
67 | if (sig && sig.startsWith('Signature ') === true) req.headers[HTTP_SIGNATURE.HEADER_NAME] = sig.replace(/^Signature /, '') | |
68 | ||
69 | let parsed: any | |
70 | ||
71 | try { | |
72 | parsed = parseHTTPSignature(req, HTTP_SIGNATURE.CLOCK_SKEW_SECONDS) | |
73 | } catch (err) { | |
74 | logger.warn('Invalid signature because of exception in signature parser', { reqBody: req.body, err }) | |
75 | ||
76 | res.fail({ | |
77 | status: HttpStatusCode.FORBIDDEN_403, | |
78 | message: err.message | |
79 | }) | |
80 | return false | |
81 | } | |
82 | ||
83 | const keyId = parsed.keyId | |
84 | if (!keyId) { | |
85 | res.fail({ | |
86 | status: HttpStatusCode.FORBIDDEN_403, | |
87 | message: 'Invalid key ID', | |
88 | data: { | |
89 | keyId | |
90 | } | |
91 | }) | |
92 | return false | |
93 | } | |
94 | ||
95 | logger.debug('Checking HTTP signature of actor %s...', keyId) | |
96 | ||
97 | let [ actorUrl ] = keyId.split('#') | |
98 | if (actorUrl.startsWith('acct:')) { | |
99 | actorUrl = await loadActorUrlOrGetFromWebfinger(actorUrl.replace(/^acct:/, '')) | |
100 | } | |
101 | ||
102 | const actor = await getOrCreateAPActor(actorUrl) | |
103 | ||
104 | const verified = isHTTPSignatureVerified(parsed, actor) | |
105 | if (verified !== true) { | |
106 | logger.warn('Signature from %s is invalid', actorUrl, { parsed }) | |
107 | ||
108 | res.fail({ | |
109 | status: HttpStatusCode.FORBIDDEN_403, | |
110 | message: 'Invalid signature', | |
111 | data: { | |
112 | actorUrl | |
113 | } | |
114 | }) | |
115 | return false | |
116 | } | |
117 | ||
118 | res.locals.signature = { actor } | |
119 | return true | |
120 | } | |
121 | ||
122 | async function checkJsonLDSignature (req: Request, res: Response) { | |
123 | const signatureObject: ActivityPubSignature = req.body.signature | |
124 | ||
125 | if (!signatureObject || !signatureObject.creator) { | |
126 | res.fail({ | |
127 | status: HttpStatusCode.FORBIDDEN_403, | |
128 | message: 'Object and creator signature do not match' | |
129 | }) | |
130 | return false | |
131 | } | |
132 | ||
133 | const [ creator ] = signatureObject.creator.split('#') | |
134 | ||
135 | logger.debug('Checking JsonLD signature of actor %s...', creator) | |
136 | ||
137 | const actor = await getOrCreateAPActor(creator) | |
138 | const verified = await isJsonLDSignatureVerified(actor, req.body) | |
139 | ||
140 | if (verified !== true) { | |
141 | logger.warn('Signature not verified.', req.body) | |
142 | ||
143 | res.fail({ | |
144 | status: HttpStatusCode.FORBIDDEN_403, | |
145 | message: 'Signature could not be verified' | |
146 | }) | |
147 | return false | |
148 | } | |
149 | ||
150 | res.locals.signature = { actor } | |
151 | return true | |
152 | } |