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-rwxr-xr-xsrc/app.py37
-rwxr-xr-xsrc/server.py6
2 files changed, 38 insertions, 5 deletions
diff --git a/src/app.py b/src/app.py
index b83666e..7533df7 100755
--- a/src/app.py
+++ b/src/app.py
@@ -40,12 +40,10 @@
# no more.
import abc
-import cgi
from collections import namedtuple
from concurrent.futures import ThreadPoolExecutor
from enum import Enum
from http import HTTPStatus
-import http.server
import json
import os
import pwd
@@ -53,6 +51,8 @@ import shlex
import socket
import subprocess
from subprocess import DEVNULL, PIPE, STDOUT
+import traceback
+import urllib.parse
def split_by(xs, sep):
@@ -510,6 +510,17 @@ def systemd_users():
return show_users(list_users())
+def cgi_one_value(params, name, default=None):
+ values = params.get(name, [])
+ if not values:
+ if default is None:
+ raise ValueError(f'must have at least one value: {name}')
+ return default
+ if len(values) > 1:
+ raise ValueError(f'multiple values are not supported: {name}')
+ return values[0]
+
+
class Request(Enum):
STATUS = 'status'
TOP = 'top'
@@ -525,22 +536,38 @@ class Request(Enum):
raise ValueError('HTTP path must start with a forward slash /')
return Request(path[1:])
+ @staticmethod
+ def from_query_string(qs):
+ params = urllib.parse.parse_qs(qs, strict_parsing=True)
+ request = cgi_one_value(params, 'what')
+ request = Request(request)
+ request.disable_power = int(cgi_one_value(params, 'disable_power', '0'))
+ return request
+
def process(self):
if self is Request.STATUS:
return Status().complete()
if self is Request.TOP:
return Top().complete()
+
+ if self in [Request.REBOOT, Request.POWEROFF] and self.disable_power:
+ return Response(None, HTTPStatus.FORBIDDEN)
if self is Request.REBOOT:
return Reboot().complete()
if self is Request.POWEROFF:
return Poweroff().complete()
+
raise NotImplementedError(f'unknown request: {self}')
def process_cgi_request():
- params = cgi.FieldStorage()
- what = params['what'].value
- Request(what).process().write_as_cgi_script()
+ try:
+ request = Request.from_query_string(os.environ['QUERY_STRING'])
+ request.process().write_as_cgi_script()
+ except:
+ status = HTTPStatus.INTERNAL_SERVER_ERROR
+ response = Response(traceback.format_exc(), status)
+ response.write_as_cgi_script()
def main():
diff --git a/src/server.py b/src/server.py
index 9ffe6f1..a0fa7c4 100755
--- a/src/server.py
+++ b/src/server.py
@@ -30,9 +30,12 @@ def default_html_dir():
class RequestHandler(http.server.SimpleHTTPRequestHandler):
+ ARGS = None
+
def do_GET(self):
try:
request = Request.from_http_path(self.path)
+ request.disable_power = RequestHandler.ARGS.disable_power
except ValueError:
return super().do_GET()
try:
@@ -60,6 +63,8 @@ def parse_args(args=None):
parser.add_argument('-p', '--port', metavar='PORT',
type=int, default=DEFAULT_PORT,
help='set port number')
+ parser.add_argument('-n', '--disable-power', action='store_true',
+ help='disable reboot/poweroff requests')
parser.add_argument('-d', '--dir', metavar='DIR',
default=default_html_dir(),
help='HTML directory path')
@@ -68,6 +73,7 @@ def parse_args(args=None):
def main(args=None):
args = parse_args(args)
+ RequestHandler.ARGS = args
# It's a failsafe; the script is not allowed to serve a random current
# working directory.