acme_letsencrypt_account_registration_and_http01_challenge_workflow.py

1import josepy as jose
2from cryptography.hazmat.primitives import serialization
3from cryptography.hazmat.primitives.asymmetric import rsa
4
5from acme import challenges
6from acme import client
7from acme import crypto_util
8from acme import messages
9from acme import standalone
10
11# This is a simplified version of the official workflow
12# 1. Generate account key
13acc_key = jose.JWKRSA(key=rsa.generate_private_key(
14    public_exponent=65537,
15    key_size=2048,
16))
17
18# 2. Register account and accept TOS
19# Using Let's Encrypt Staging Directory
20DIRECTORY_URL = 'https://acme-staging-v02.api.letsencrypt.org/directory'
21net = client.ClientNetwork(acc_key)
22directory = messages.Directory.from_json(net.get(DIRECTORY_URL).json())
23client_acme = client.ClientV2(directory, net)
24
25regr = client_acme.new_account(
26    messages.NewRegistration.from_data(
27        email='your-email@example.com', terms_of_service_agreed=True))
28
29# 3. Create a Certificate Signing Request (CSR)
30domain = 'example.com'
31pkey = rsa.generate_private_key(public_exponent=65537, key_size=2048)
32csr_pem = crypto_util.make_csr(serialization.private_key_to_pem(
33    pkey, serialization.NoEncryption()), [domain])
34
35# 4. Request Order and Solve Challenge
36order = client_acme.new_order(csr_pem)
37authz = order.authorizations[0]
38challb = [c for c in authz.body.challenges if isinstance(c.chall, challenges.HTTP01)][0]
39
40# Response for HTTP-01
41response, validation = challb.response_and_validation(acc_key)
42
43# 5. Perform validation (This part usually involves setting up a web server)
44# client_acme.answer_challenge(challb, response)
45
46# 6. Finalize order and poll for certificate
47# finalized_order = client_acme.finalize_order(order, csr_pem)
48# certificate = client_acme.poll_and_request_issuance(finalized_order)
49
50print("Account registered: ", regr.uri)