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78 lines
2.8 KiB
Python
78 lines
2.8 KiB
Python
import base64
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import logging
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import re
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import shlex
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import subprocess
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from email.headerregistry import Address
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import orjson
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from django.conf import settings
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from django.http import HttpRequest, HttpResponse
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from django.utils.translation import gettext as _
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from zerver.decorator import authenticated_json_view
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from zerver.lib.ccache import make_ccache
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from zerver.lib.exceptions import JsonableError
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from zerver.lib.pysa import mark_sanitized
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from zerver.lib.response import json_success
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from zerver.lib.typed_endpoint import typed_endpoint
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from zerver.models import UserProfile
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# Hack for mit.edu users whose Kerberos usernames don't match what they zephyr
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# as. The key is for Kerberos and the value is for zephyr.
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kerberos_alter_egos = {
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"golem": "ctl",
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}
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@authenticated_json_view
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@typed_endpoint
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def webathena_kerberos_login(
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request: HttpRequest, user_profile: UserProfile, *, cred: str | None = None
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) -> HttpResponse:
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if cred is None:
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raise JsonableError(_("Could not find Kerberos credential"))
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if not user_profile.realm.webathena_enabled:
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raise JsonableError(_("Webathena login not enabled"))
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try:
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parsed_cred = orjson.loads(cred)
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user = parsed_cred["cname"]["nameString"][0]
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if user in kerberos_alter_egos:
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user = kerberos_alter_egos[user]
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assert user == Address(addr_spec=user_profile.email).username
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# Limit characters in usernames to valid MIT usernames
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# This is important for security since DNS is not secure.
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assert re.match(r"^[a-z0-9_.-]+$", user) is not None
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ccache = make_ccache(parsed_cred)
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# 'user' has been verified to contain only benign characters that won't
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# help with shell injection.
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user = mark_sanitized(user)
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# 'ccache' is only written to disk by the script and used as a kerberos
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# credential cache file.
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ccache = mark_sanitized(ccache)
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except Exception:
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raise JsonableError(_("Invalid Kerberos cache"))
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if settings.PERSONAL_ZMIRROR_SERVER is None:
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logging.error("PERSONAL_ZMIRROR_SERVER is not properly configured", stack_info=True)
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raise JsonableError(_("We were unable to set up mirroring for you"))
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# TODO: Send these data via (say) RabbitMQ
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try:
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api_key = user_profile.api_key
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command = [
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"/home/zulip/python-zulip-api/zulip/integrations/zephyr/process_ccache",
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user,
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api_key,
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base64.b64encode(ccache).decode(),
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]
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subprocess.check_call(["ssh", settings.PERSONAL_ZMIRROR_SERVER, "--", shlex.join(command)])
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except subprocess.CalledProcessError:
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logging.exception("Error updating the user's ccache", stack_info=True)
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raise JsonableError(_("We were unable to set up mirroring for you"))
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return json_success(request)
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