mirror of
https://github.com/bulwarkmail/webmail.git
synced 2026-11-02 08:15:55 +00:00
Linus Rath
cf0eb03c4a
Stalwart does no BIMI, so sender icons were only ever favicons, which anyone controls for any domain. The webmail server now does the receiver side itself at /api/bimi, and avatars ask it only for messages whose own Authentication-Results say dmarc=pass for the exact From domain. - `lib/bimi/`: DMARC policy check (quarantine or reject, pct=100, the parent domain's sp and p for subdomains), the assertion record with fallback to the parent domain, mark certificate validation (chain to pinned DigiCert, GlobalSign and SSL.com VMC roots, BIMI key purpose, validity, SAN, SCTs present, CRL revocation, logo from the logotype extension), SVG Tiny PS checks and rendering to PNG, caching - logos backed only by the DNS record show by default; the admin setting "Require a mark certificate" (`BIMI_REQUIRE_CERTIFICATE`) limits them to VMC and CMC backed ones - a check mark beside the sender's name for certificate-backed logos - avatars try contact photo, BIMI logo, plugin avatar, favicon; the sender warning shield still wins, and logos follow the sender icons setting and the no-third-party-traffic mode - the two-label public suffix list moved to `lib/root-domain.ts` SCT signatures are not verified and only the default selector is used.
159 lines
5.9 KiB
Python
159 lines
5.9 KiB
Python
"""
|
|
Makes the test mark-certificate PKI the BIMI tests use (lib/__tests__/bimi-certificate.test.ts):
|
|
a root, an intermediate with the BIMI key purpose, leaves with and without
|
|
each required extension, and a CRL from the intermediate that revokes
|
|
leaf-revoked. Needs OpenSSL 3.4 or newer.
|
|
|
|
python generate.py <new empty directory>
|
|
|
|
Copy the .pem files (never the keys) back here. The certificates run from
|
|
2026 to 2036; the tests pin the time they check at.
|
|
|
|
cnn-vmc.pem is not made here: it is CNN's real VMC from DigiCert, as its
|
|
BIMI record served it in October 2026.
|
|
"""
|
|
import base64, gzip, hashlib, os, subprocess, sys
|
|
|
|
out = sys.argv[1]
|
|
os.makedirs(out, exist_ok=False)
|
|
os.chdir(out)
|
|
|
|
|
|
def run(*args):
|
|
r = subprocess.run(args, capture_output=True, text=True)
|
|
if r.returncode:
|
|
print(' '.join(args), r.stderr)
|
|
sys.exit(1)
|
|
return r.stdout
|
|
|
|
|
|
def tlv(tag, content):
|
|
n = len(content)
|
|
if n < 0x80:
|
|
length = bytes([n])
|
|
else:
|
|
b = n.to_bytes((n.bit_length() + 7) // 8, 'big')
|
|
length = bytes([0x80 | len(b)]) + b
|
|
return bytes([tag]) + length + content
|
|
|
|
|
|
def oid(s):
|
|
p = [int(x) for x in s.split('.')]
|
|
body = bytes([40 * p[0] + p[1]])
|
|
for v in p[2:]:
|
|
enc = [v & 0x7f]
|
|
v >>= 7
|
|
while v:
|
|
enc.append(0x80 | (v & 0x7f))
|
|
v >>= 7
|
|
body += bytes(reversed(enc))
|
|
return tlv(0x06, body)
|
|
|
|
|
|
SVG = b'<svg version="1.2" baseProfile="tiny-ps" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><title>Brand Example</title><rect width="100" height="100" fill="#0a6"/></svg>'
|
|
gz = gzip.compress(SVG, mtime=0)
|
|
uri = b'data:image/svg+xml;base64,' + base64.b64encode(gz)
|
|
hav = tlv(0x30, tlv(0x30, oid('2.16.840.1.101.3.4.2.1') + b'\x05\x00') + tlv(0x04, hashlib.sha256(gz).digest()))
|
|
details = tlv(0x30, tlv(0x16, b'image/svg+xml') + tlv(0x30, hav) + tlv(0x30, tlv(0x16, uri)))
|
|
image = tlv(0x30, details)
|
|
logotype = tlv(0x30, tlv(0xa2, tlv(0xa0, tlv(0x30, image))))
|
|
LOGO = logotype.hex()
|
|
SCT = tlv(0x04, b'\x00\x00').hex()
|
|
BIMI = '1.3.6.1.5.5.7.3.31'
|
|
|
|
with open('openssl.cnf', 'w') as f:
|
|
f.write(f"""
|
|
oid_section = new_oids
|
|
[ new_oids ]
|
|
markType = 1.3.6.1.4.1.53087.1.13
|
|
[ req ]
|
|
distinguished_name = dn
|
|
prompt = no
|
|
[ dn ]
|
|
CN = placeholder
|
|
[ root_ext ]
|
|
basicConstraints = critical,CA:true
|
|
keyUsage = critical,keyCertSign,cRLSign
|
|
subjectKeyIdentifier = hash
|
|
[ int_ext ]
|
|
basicConstraints = critical,CA:true,pathlen:0
|
|
keyUsage = critical,keyCertSign,cRLSign
|
|
extendedKeyUsage = {BIMI}
|
|
subjectKeyIdentifier = hash
|
|
authorityKeyIdentifier = keyid
|
|
[ leaf_ext ]
|
|
basicConstraints = critical,CA:false
|
|
keyUsage = critical,digitalSignature
|
|
extendedKeyUsage = {BIMI}
|
|
subjectAltName = DNS:brand.example
|
|
crlDistributionPoints = URI:http://crl.brand-ca.test/vmc.crl
|
|
1.3.6.1.5.5.7.1.12 = DER:{LOGO}
|
|
1.3.6.1.4.1.11129.2.4.2 = DER:{SCT}
|
|
authorityKeyIdentifier = keyid
|
|
[ leaf_selector_ext ]
|
|
basicConstraints = critical,CA:false
|
|
extendedKeyUsage = {BIMI}
|
|
subjectAltName = DNS:brand._bimi.brand.example
|
|
crlDistributionPoints = URI:http://crl.brand-ca.test/vmc.crl
|
|
1.3.6.1.5.5.7.1.12 = DER:{LOGO}
|
|
1.3.6.1.4.1.11129.2.4.2 = DER:{SCT}
|
|
[ leaf_no_sct_ext ]
|
|
basicConstraints = critical,CA:false
|
|
extendedKeyUsage = {BIMI}
|
|
subjectAltName = DNS:brand.example
|
|
1.3.6.1.5.5.7.1.12 = DER:{LOGO}
|
|
[ leaf_no_logo_ext ]
|
|
basicConstraints = critical,CA:false
|
|
extendedKeyUsage = {BIMI}
|
|
subjectAltName = DNS:brand.example
|
|
1.3.6.1.4.1.11129.2.4.2 = DER:{SCT}
|
|
[ leaf_server_ext ]
|
|
basicConstraints = critical,CA:false
|
|
extendedKeyUsage = serverAuth
|
|
subjectAltName = DNS:brand.example
|
|
1.3.6.1.5.5.7.1.12 = DER:{LOGO}
|
|
1.3.6.1.4.1.11129.2.4.2 = DER:{SCT}
|
|
[ ca ]
|
|
default_ca = int_ca
|
|
[ int_ca ]
|
|
database = index.txt
|
|
crlnumber = crlnumber
|
|
default_md = sha256
|
|
default_crl_days = 3650
|
|
""")
|
|
open('index.txt', 'w').close()
|
|
with open('crlnumber', 'w') as f:
|
|
f.write('01\n')
|
|
|
|
|
|
def cert(name, subj, issuer, ext, nb='20260101000000Z', na='20360101000000Z', serial=None):
|
|
run('openssl', 'genrsa', '-out', f'{name}.key', '2048')
|
|
run('openssl', 'req', '-new', '-key', f'{name}.key', '-subj', subj, '-out', f'{name}.csr', '-config', 'openssl.cnf')
|
|
args = ['openssl', 'x509', '-req', '-in', f'{name}.csr', '-out', f'{name}.pem', '-extfile', 'openssl.cnf',
|
|
'-extensions', ext, '-not_before', nb, '-not_after', na, '-sha256',
|
|
'-set_serial', serial or str(int.from_bytes(os.urandom(8), 'big'))]
|
|
if issuer:
|
|
args += ['-CA', f'{issuer}.pem', '-CAkey', f'{issuer}.key']
|
|
else:
|
|
args += ['-key', f'{name}.key']
|
|
run(*args)
|
|
|
|
|
|
cert('root', '/C=XX/O=Test Mark Authority/CN=Test Verified Mark Root', None, 'root_ext')
|
|
cert('other-root', '/C=XX/O=Other Authority/CN=Test Verified Mark Root', None, 'root_ext')
|
|
cert('intermediate', '/C=XX/O=Test Mark Authority/CN=Test Verified Mark CA', 'root', 'int_ext')
|
|
LEAF = '/C=XX/O=Brand Example Ltd/CN=Brand Example Ltd/markType=Registered Mark'
|
|
cert('leaf', LEAF, 'intermediate', 'leaf_ext')
|
|
cert('leaf-cmc', '/C=XX/O=Brand Example Ltd/CN=Brand Example Ltd/markType=Prior Use Mark', 'intermediate', 'leaf_ext')
|
|
cert('leaf-selector', LEAF, 'intermediate', 'leaf_selector_ext')
|
|
cert('leaf-no-sct', LEAF, 'intermediate', 'leaf_no_sct_ext')
|
|
cert('leaf-no-logo', LEAF, 'intermediate', 'leaf_no_logo_ext')
|
|
cert('leaf-server', LEAF, 'intermediate', 'leaf_server_ext')
|
|
cert('leaf-expired', LEAF, 'intermediate', 'leaf_ext', nb='20240101000000Z', na='20250101000000Z')
|
|
cert('leaf-revoked', LEAF, 'intermediate', 'leaf_ext', serial='0x0BADC0DE')
|
|
cert('leaf-other', LEAF, 'other-root', 'leaf_ext')
|
|
run('openssl', 'ca', '-config', 'openssl.cnf', '-revoke', 'leaf-revoked.pem', '-keyfile', 'intermediate.key', '-cert', 'intermediate.pem')
|
|
run('openssl', 'ca', '-config', 'openssl.cnf', '-gencrl', '-keyfile', 'intermediate.key', '-cert', 'intermediate.pem', '-out', 'intermediate.crl.pem')
|
|
run('openssl', 'crl', '-in', 'intermediate.crl.pem', '-outform', 'DER', '-out', 'intermediate.crl')
|
|
print(run('openssl', 'x509', '-in', 'leaf.pem', '-noout', '-text')[:1800])
|