def authenticate_user_if_possible(request, response, state, user, _):
"""This signs the user in.
"""
if request.line.uri.startswith(b'/assets/'):
return
db = state['website'].db
if not db:
return
# Try to authenticate the user
# We want to try cookie auth first, but we want password and email auth to
# supersede it.
p = None
if SESSION in request.headers.cookie:
creds = request.headers.cookie[SESSION].value.split(':', 2)
if len(creds) == 2:
creds = [creds[0], 1, creds[1]]
if len(creds) == 3:
p = Participant.authenticate(*creds)
if p:
state['user'] = p
session_p, p = p, None
session_suffix = ''
redirect = False
redirect_url = None
if request.method == 'POST':
# Form auth
body = _get_body(request)
if body:
# Remove email address from blacklist if requested
email_address = body.pop('email.unblacklist', None)
if email_address:
remove_email_address_from_blacklist(email_address, user, request)
# Proceed with form auth
carry_on = body.pop('log-in.carry-on', None)
if carry_on:
p_email = session_p and session_p.get_email_address()
if p_email != carry_on:
state['log-in.carry-on'] = carry_on
raise LoginRequired
else:
p = sign_in_with_form_data(body, state)
if p:
redirect = body.get('form.repost', None) != 'true'
redirect_url = body.get('sign-in.back-to') or request.line.uri.decoded
elif request.method == 'GET':
if request.qs.get('log-in.id'):
# Email auth
id = request.qs.get('log-in.id')
session_id = request.qs.get('log-in.key')
token = request.qs.get('log-in.token')
if not (token and token.endswith('.em')):
raise response.render('simplates/bad-login-link.spt', state)
p = Participant.authenticate(id, session_id, token)
if p:
redirect = True
session_p = p
session_suffix = '.em'
else:
raise response.render('simplates/bad-login-link.spt', state)
del request.qs['log-in.id'], request.qs['log-in.key'], request.qs['log-in.token']
# Handle email verification
email_id = request.qs.get_int('email.id', default=None)
email_nonce = request.qs.get('email.nonce', '')
if email_id and not request.path.raw.endswith('/disavow'):
email_participant, email_is_already_verified = db.one("""
SELECT p, e.verified
FROM emails e
JOIN participants p On p.id = e.participant
WHERE e.id = %s
""", (email_id,), default=(None, None))
if email_participant:
result = email_participant.verify_email(email_id, email_nonce, p)
state['email.verification-result'] = result
request.qs.pop('email.id', None)
request.qs.pop('email.nonce', None)
if result == EmailVerificationResult.SUCCEEDED:
request.qs.add('success', b64encode_s(
_("Your email address is now verified.")
))
del email_participant
# Set up the new session
if p:
if session_p:
session_p.sign_out(response.headers.cookie)
if p.status == 'closed':
p.update_status('active')
if not p.session:
p.sign_in(response.headers.cookie, suffix=session_suffix)
state['user'] = p
# Redirect if appropriate
if redirect:
if not redirect_url:
# Build the redirect URL with the querystring as it is now (we've
# probably removed items from it at this point).
redirect_url = request.path.raw + request.qs.serialize()
response.redirect(redirect_url, trusted_url=False)
def authenticate_user_if_possible(csrf_token, request, response, state, user,
_):
"""This signs the user in.
"""
if state.get('etag'):
return
db = state['website'].db
if not db:
return
# Try to authenticate the user
# We want to try cookie auth first, but we want password and email auth to
# supersede it.
session_p = None
if SESSION in request.headers.cookie:
creds = request.headers.cookie[SESSION].value.split(':', 2)
if len(creds) == 2:
creds = [creds[0], 1, creds[1]]
if len(creds) == 3:
session_p, state[
'session_status'] = Participant.authenticate_with_session(
*creds,
allow_downgrade=True,
cookies=response.headers.cookie)
if session_p:
user = state['user'] = session_p
p = None
session_suffix = ''
redirect = False
redirect_url = None
if request.method == 'POST':
# Form auth
body = _get_body(request)
if body:
redirect = body.get('form.repost', None) != 'true'
redirect_url = body.get('sign-in.back-to')
# Remove email address from blacklist if requested
email_address = body.pop('email.unblacklist', None)
if email_address:
remove_email_address_from_blacklist(email_address, user,
request)
# Proceed with form auth
carry_on = body.pop('log-in.carry-on', None)
if carry_on:
can_carry_on = (session_p is not None
and session_p.session_type != 'ro'
and session_p.get_email_address() == carry_on)
if not can_carry_on:
state['log-in.carry-on'] = carry_on
raise LoginRequired
else:
p = sign_in_with_form_data(body, state)
if p:
if not p.session:
session_suffix = '.pw' # stands for "password"
else:
redirect = False
elif request.method == 'GET':
if request.qs.get('log-in.id') or request.qs.get('email.id'):
# Prevent email software from messing up an email log-in or confirmation
# with a single GET request. Also, show a proper warning to someone trying
# to log in while cookies are disabled.
require_cookie(state)
if request.qs.get('log-in.id'):
# Email auth
id = request.qs.get_int('log-in.id')
session_id = request.qs.get('log-in.key')
if not session_id or session_id < '1001' or session_id > '1010':
raise response.render('simplates/log-in-link-is-invalid.spt',
state)
token = request.qs.get('log-in.token')
if not (token and token.endswith('.em')):
raise response.render('simplates/log-in-link-is-invalid.spt',
state)
required = request.qs.parse_boolean('log-in.required',
default=True)
p = Participant.authenticate_with_session(
id,
session_id,
token,
allow_downgrade=not required,
cookies=response.headers.cookie,
)[0]
if p:
if p.id != user.id:
submitted_confirmation_token = request.qs.get(
'log-in.confirmation')
if submitted_confirmation_token:
expected_confirmation_token = b64encode_s(
blake2b(
token.encode('ascii'),
key=csrf_token.token.encode('ascii'),
digest_size=48,
).digest())
confirmation_tokens_match = constant_time_compare(
expected_confirmation_token,
submitted_confirmation_token)
if not confirmation_tokens_match:
raise response.invalid_input(
submitted_confirmation_token,
'log-in.confirmation', 'querystring')
del request.qs['log-in.confirmation']
else:
raise response.render(
'simplates/log-in-link-is-valid.spt', state)
redirect = True
db.run(
"""
DELETE FROM user_secrets
WHERE participant = %s
AND id = %s
AND mtime = %s
""", (p.id, p.session.id, p.session.mtime))
p.session = None
session_suffix = '.em'
elif required:
raise response.render('simplates/log-in-link-is-invalid.spt',
state)
del request.qs['log-in.id'], request.qs['log-in.key'], request.qs[
'log-in.token']
request.qs.pop('log-in.required', None)
# Handle email verification
email_id = request.qs.get_int('email.id', default=None)
email_nonce = request.qs.get('email.nonce', '')
if email_id and not request.path.raw.endswith('/disavow'):
email_participant, email_is_already_verified = db.one(
"""
SELECT p, e.verified
FROM emails e
JOIN participants p On p.id = e.participant
WHERE e.id = %s
""", (email_id, ),
default=(None, None))
if email_participant:
result = email_participant.verify_email(
email_id, email_nonce, p or user, request)
state['email.verification-result'] = result
request.qs.pop('email.id', None)
request.qs.pop('email.nonce', None)
if result == EmailVerificationResult.SUCCEEDED:
request.qs.add(
'success',
b64encode_s(_("Your email address is now verified.")))
del email_participant
# Set up the new session
if p:
if p.status == 'closed':
p.update_status('active')
if session_p:
p.regenerate_session(session_p.session,
response.headers.cookie,
suffix=session_suffix)
if not p.session:
p.sign_in(response.headers.cookie, suffix=session_suffix)
state['user'] = p
# Redirect if appropriate
if redirect:
if not redirect_url:
# Build the redirect URL with the querystring as it is now (we've
# probably removed items from it at this point).
redirect_url = request.path.raw + request.qs.serialize()
response.redirect(redirect_url, trusted_url=False)
