1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
import { NextFunction, Request, Response } from 'express'
import { isActorDeleteActivityValid } from '@server/helpers/custom-validators/activitypub/actor'
import { getAPId } from '@server/lib/activitypub/activity'
import { wrapWithSpanAndContext } from '@server/lib/opentelemetry/tracing'
import { ActivityDelete, ActivityPubSignature, HttpStatusCode } from '@shared/models'
import { logger } from '../helpers/logger'
import { isHTTPSignatureVerified, isJsonLDSignatureVerified, parseHTTPSignature } from '../helpers/peertube-crypto'
import { ACCEPT_HEADERS, ACTIVITY_PUB, HTTP_SIGNATURE } from '../initializers/constants'
import { getOrCreateAPActor, loadActorUrlOrGetFromWebfinger } from '../lib/activitypub/actors'
async function checkSignature (req: Request, res: Response, next: NextFunction) {
try {
const httpSignatureChecked = await checkHttpSignature(req, res)
if (httpSignatureChecked !== true) return
const actor = res.locals.signature.actor
// Forwarded activity
const bodyActor = req.body.actor
const bodyActorId = getAPId(bodyActor)
if (bodyActorId && bodyActorId !== actor.url) {
const jsonLDSignatureChecked = await checkJsonLDSignature(req, res)
if (jsonLDSignatureChecked !== true) return
}
return next()
} catch (err) {
const activity: ActivityDelete = req.body
if (isActorDeleteActivityValid(activity) && activity.object === activity.actor) {
logger.debug('Handling signature error on actor delete activity', { err })
return res.status(HttpStatusCode.NO_CONTENT_204).end()
}
logger.warn('Error in ActivityPub signature checker.', { err })
return res.fail({
status: HttpStatusCode.FORBIDDEN_403,
message: 'ActivityPub signature could not be checked'
})
}
}
function executeIfActivityPub (req: Request, res: Response, next: NextFunction) {
const accepted = req.accepts(ACCEPT_HEADERS)
if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.includes(accepted) === false) {
// Bypass this route
return next('route')
}
logger.debug('ActivityPub request for %s.', req.url)
return next()
}
// ---------------------------------------------------------------------------
export {
checkSignature,
executeIfActivityPub,
checkHttpSignature
}
// ---------------------------------------------------------------------------
async function checkHttpSignature (req: Request, res: Response) {
return wrapWithSpanAndContext('peertube.activitypub.checkHTTPSignature', async () => {
// FIXME: compatibility with http-signature < v1.3
const sig = req.headers[HTTP_SIGNATURE.HEADER_NAME] as string
if (sig && sig.startsWith('Signature ') === true) req.headers[HTTP_SIGNATURE.HEADER_NAME] = sig.replace(/^Signature /, '')
let parsed: any
try {
parsed = parseHTTPSignature(req, HTTP_SIGNATURE.CLOCK_SKEW_SECONDS)
} catch (err) {
logger.warn('Invalid signature because of exception in signature parser', { reqBody: req.body, err })
res.fail({
status: HttpStatusCode.FORBIDDEN_403,
message: err.message
})
return false
}
const keyId = parsed.keyId
if (!keyId) {
res.fail({
status: HttpStatusCode.FORBIDDEN_403,
message: 'Invalid key ID',
data: {
keyId
}
})
return false
}
logger.debug('Checking HTTP signature of actor %s...', keyId)
let [ actorUrl ] = keyId.split('#')
if (actorUrl.startsWith('acct:')) {
actorUrl = await loadActorUrlOrGetFromWebfinger(actorUrl.replace(/^acct:/, ''))
}
const actor = await getOrCreateAPActor(actorUrl)
const verified = isHTTPSignatureVerified(parsed, actor)
if (verified !== true) {
logger.warn('Signature from %s is invalid', actorUrl, { parsed })
res.fail({
status: HttpStatusCode.FORBIDDEN_403,
message: 'Invalid signature',
data: {
actorUrl
}
})
return false
}
res.locals.signature = { actor }
return true
})
}
async function checkJsonLDSignature (req: Request, res: Response) {
return wrapWithSpanAndContext('peertube.activitypub.JSONLDSignature', async () => {
const signatureObject: ActivityPubSignature = req.body.signature
if (!signatureObject?.creator) {
res.fail({
status: HttpStatusCode.FORBIDDEN_403,
message: 'Object and creator signature do not match'
})
return false
}
const [ creator ] = signatureObject.creator.split('#')
logger.debug('Checking JsonLD signature of actor %s...', creator)
const actor = await getOrCreateAPActor(creator)
const verified = await isJsonLDSignatureVerified(actor, req.body)
if (verified !== true) {
logger.warn('Signature not verified.', req.body)
res.fail({
status: HttpStatusCode.FORBIDDEN_403,
message: 'Signature could not be verified'
})
return false
}
res.locals.signature = { actor }
return true
})
}
|
