1 # -*- coding: utf-8 -*-
3 # Copyright P. Christeas <p_christ@hol.gr> 2008,2009
4 # A part of the code comes from the ganeti project: http://www.mail-archive.com/ganeti-devel@googlegroups.com/msg00713.html#
6 # WARNING: This program as such is intended to be used by professional
7 # programmers who take the whole responsability of assessing all potential
8 # consequences resulting from its eventual inadequacies and bugs
9 # End users who are looking for a ready-to-use solution with commercial
10 # garantees and support are strongly adviced to contract a Free Software
13 # This program is Free Software; you can redistribute it and/or
14 # modify it under the terms of the GNU General Public License
15 # as published by the Free Software Foundation; either version 2
16 # of the License, or (at your option) any later version.
18 # This program is distributed in the hope that it will be useful,
19 # but WITHOUT ANY WARRANTY; without even the implied warranty of
20 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 # GNU General Public License for more details.
23 # You should have received a copy of the GNU General Public License
24 # along with this program; if not, write to the Free Software
25 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 ###############################################################################
28 """ Framework for generic http servers
35 from BaseHTTPServer import *
36 from SimpleHTTPServer import SimpleHTTPRequestHandler
38 class AuthRequiredExc(Exception):
39 def __init__(self,atype,realm):
40 Exception.__init__(self)
44 class AuthRejectedExc(Exception):
48 def __init__(self,realm):
51 def setupAuth(self, multi,handler):
52 """ Attach an AuthProxy object to handler
56 def authenticate(self, user, passwd, client_address):
62 class BasicAuthProvider(AuthProvider):
63 def setupAuth(self, multi, handler):
64 if not multi.sec_realms.has_key(self.realm):
65 multi.sec_realms[self.realm] = BasicAuthProxy(self)
69 """ This class will hold authentication information for a handler,
72 def __init__(self, provider):
73 self.provider = provider
75 def checkRequest(self,handler,path = '/'):
76 """ Check if we are allowed to process that request
80 class BasicAuthProxy(AuthProxy):
81 """ Require basic authentication..
83 def __init__(self,provider):
84 AuthProxy.__init__(self,provider)
85 self.auth_creds = None
88 def checkRequest(self,handler,path = '/'):
91 auth_str = handler.headers.get('Authorization',False)
92 if auth_str and auth_str.startswith('Basic '):
93 auth_str=auth_str[len('Basic '):]
94 (user,passwd) = base64.decodestring(auth_str).split(':')
95 self.provider.log("Found user=\"%s\", passwd=\"%s\"" %(user,passwd))
96 self.auth_creds = self.provider.authenticate(user,passwd,handler.client_address)
99 if self.auth_tries > 5:
100 self.provider.log("Failing authorization after 5 requests w/o password")
101 raise AuthRejectedExc("Authorization failed.")
103 raise AuthRequiredExc(atype = 'Basic', realm=self.provider.realm)
106 class HTTPHandler(SimpleHTTPRequestHandler):
107 def __init__(self,request, client_address, server):
108 SimpleHTTPRequestHandler.__init__(self,request,client_address,server)
109 # print "Handler for %s inited" % str(client_address)
110 self.protocol_version = 'HTTP/1.1'
111 self.connection = dummyconn()
114 """ Classes here should NOT handle inside their constructor
125 """ A dispatcher class, like a virtual folder in httpd
127 def __init__(self,path,handler, auth_provider = None):
129 self.handler = handler
130 self.auth_provider = auth_provider
132 def matches(self, request):
133 """ Test if some request matches us. If so, return
134 the matched path. """
135 if request.startswith(self.path):
140 """ a class to use instead of the real connection
142 def makefile(self, mode, bufsize):
146 def shutdown(self, tru):
149 def _quote_html(html):
150 return html.replace("&", "&").replace("<", "<").replace(">", ">")
153 #error_message_format = """ """
154 def send_error(self, code, message=None):
155 #overriden from BaseHTTPRequestHandler, we also send the content-length
157 short, long = self.responses[code]
159 short, long = '???', '???'
163 self.log_error("code %d, message %s", code, message)
164 # using _quote_html to prevent Cross Site Scripting attacks (see bug #1100201)
165 content = (self.error_message_format %
166 {'code': code, 'message': _quote_html(message), 'explain': explain})
167 self.send_response(code, message)
168 self.send_header("Content-Type", self.error_content_type)
169 self.send_header('Connection', 'close')
170 self.send_header('Content-Length', len(content) or 0)
172 if hasattr(self, '_flush'):
175 if self.command != 'HEAD' and code >= 200 and code not in (204, 304):
176 self.wfile.write(content)
179 _HTTP_OPTIONS = 'OPTIONS'
181 def do_OPTIONS(self):
182 """return the list of capabilities """
184 self.send_response(200)
185 self.send_header("Content-Length", 0)
187 self.send_header('Allow', self._HTTP_OPTIONS)
190 class MultiHTTPHandler(FixSendError, HttpOptions, BaseHTTPRequestHandler):
191 """ this is a multiple handler, that will dispatch each request
192 to a nested handler, iff it matches
194 The handler will also have *one* dict of authentication proxies,
195 groupped by their realm.
198 protocol_version = "HTTP/1.1"
199 default_request_version = "HTTP/0.9" # compatibility with py2.5
201 auth_required_msg = """ <html><head><title>Authorization required</title></head>
202 <body>You must authenticate to use this service</body><html>\r\r"""
204 def __init__(self, request, client_address, server):
205 self.in_handlers = {}
207 SocketServer.StreamRequestHandler.__init__(self,request,client_address,server)
208 self.log_message("MultiHttpHandler init for %s" %(str(client_address)))
210 def _handle_one_foreign(self,fore, path, auth_provider):
211 """ This method overrides the handle_one_request for *children*
212 handlers. It is required, since the first line should not be
216 fore.raw_requestline = "%s %s %s\n" % (self.command, path, self.version)
217 if not fore.parse_request(): # An error code has been sent, just exit
219 self.request_version = fore.request_version
220 if auth_provider and auth_provider.realm:
222 self.sec_realms[auth_provider.realm].checkRequest(fore,path)
223 except AuthRequiredExc,ae:
224 if self.request_version != 'HTTP/1.1':
225 self.log_error("Cannot require auth at %s",self.request_version)
228 self._get_ignore_body(fore) # consume any body that came, not loose sync with input
229 self.send_response(401,'Authorization required')
230 self.send_header('WWW-Authenticate','%s realm="%s"' % (ae.atype,ae.realm))
231 self.send_header('Connection', 'keep-alive')
232 self.send_header('Content-Type','text/html')
233 self.send_header('Content-Length',len(self.auth_required_msg))
235 self.wfile.write(self.auth_required_msg)
237 except AuthRejectedExc,e:
238 self.log_error("Rejected auth: %s" % e.args[0])
239 self.send_error(403,e.args[0])
240 self.close_connection = 1
242 mname = 'do_' + fore.command
243 if not hasattr(fore, mname):
244 if fore.command == 'OPTIONS':
247 self.send_error(501, "Unsupported method (%r)" % fore.command)
249 fore.close_connection = 0
250 method = getattr(fore, mname)
253 except (AuthRejectedExc, AuthRequiredExc):
256 self.log_error("Could not run %s: %s" % (mname, e))
257 self._get_ignore_body(fore)
258 self.send_error(500, "Internal error")
259 # may not work if method has already sent data
260 fore.close_connection = 1
261 self.close_connection = 1
262 if hasattr(fore, '_flush'):
266 if fore.close_connection:
267 # print "Closing connection because of handler"
268 self.close_connection = fore.close_connection
269 if hasattr(fore, '_flush'):
273 def parse_rawline(self):
274 """Parse a request (internal).
276 The request should be stored in self.raw_requestline; the results
277 are in self.command, self.path, self.request_version and
280 Return True for success, False for failure; on failure, an
284 self.command = None # set in case of error on the first line
285 self.request_version = version = self.default_request_version
286 self.close_connection = 1
287 requestline = self.raw_requestline
288 if requestline[-2:] == '\r\n':
289 requestline = requestline[:-2]
290 elif requestline[-1:] == '\n':
291 requestline = requestline[:-1]
292 self.requestline = requestline
293 words = requestline.split()
295 [command, path, version] = words
296 if version[:5] != 'HTTP/':
297 self.send_error(400, "Bad request version (%r)" % version)
300 base_version_number = version.split('/', 1)[1]
301 version_number = base_version_number.split(".")
302 # RFC 2145 section 3.1 says there can be only one "." and
303 # - major and minor numbers MUST be treated as
305 # - HTTP/2.4 is a lower version than HTTP/2.13, which in
306 # turn is lower than HTTP/12.3;
307 # - Leading zeros MUST be ignored by recipients.
308 if len(version_number) != 2:
310 version_number = int(version_number[0]), int(version_number[1])
311 except (ValueError, IndexError):
312 self.send_error(400, "Bad request version (%r)" % version)
314 if version_number >= (1, 1):
315 self.close_connection = 0
316 if version_number >= (2, 0):
318 "Invalid HTTP Version (%s)" % base_version_number)
320 elif len(words) == 2:
321 [command, path] = words
322 self.close_connection = 1
325 "Bad HTTP/0.9 request type (%r)" % command)
330 #self.send_error(400, "Bad request syntax (%r)" % requestline)
332 self.request_version = version
333 self.command, self.path, self.version = command, path, version
336 def handle_one_request(self):
337 """Handle a single HTTP request.
338 Dispatch to the correct handler.
340 self.request.setblocking(True)
341 self.raw_requestline = self.rfile.readline()
342 if not self.raw_requestline:
343 self.close_connection = 1
344 # self.log_message("no requestline, connection closed?")
346 if not self.parse_rawline():
347 self.log_message("Could not parse rawline.")
349 # self.parse_request(): # Do NOT parse here. the first line should be the only
351 if self.path == '*' and self.command == 'OPTIONS':
352 # special handling of path='*', must not use any vdir at all.
353 if not self.parse_request():
358 for vdir in self.server.vdirs:
359 p = vdir.matches(self.path)
362 npath = self.path[len(p):]
363 if not npath.startswith('/'):
366 if not self.in_handlers.has_key(p):
367 self.in_handlers[p] = vdir.handler(noconnection(),self.client_address,self.server)
368 if vdir.auth_provider:
369 vdir.auth_provider.setupAuth(self, self.in_handlers[p])
370 hnd = self.in_handlers[p]
371 hnd.rfile = self.rfile
372 hnd.wfile = self.wfile
373 self.rlpath = self.raw_requestline
374 self._handle_one_foreign(hnd,npath, vdir.auth_provider)
375 # print "Handled, closing = ", self.close_connection
378 self.send_error(404, "Path not found: %s" % self.path)
381 def _get_ignore_body(self,fore):
382 if not fore.headers.has_key("content-length"):
384 max_chunk_size = 10*1024*1024
385 size_remaining = int(fore.headers["content-length"])
387 while size_remaining:
388 chunk_size = min(size_remaining, max_chunk_size)
389 got = fore.rfile.read(chunk_size)
390 size_remaining -= len(got)
393 class SecureMultiHTTPHandler(MultiHTTPHandler):
394 def getcert_fnames(self):
395 """ Return a pair with the filenames of ssl cert,key
397 Override this to direct to other filenames
399 return ('server.cert','server.key')
403 certfile, keyfile = self.getcert_fnames()
405 self.connection = ssl.wrap_socket(self.request,
409 ssl_version=ssl.PROTOCOL_SSLv23)
410 self.rfile = self.connection.makefile('rb', self.rbufsize)
411 self.wfile = self.connection.makefile('wb', self.wbufsize)
412 self.log_message("Secure %s connection from %s",self.connection.cipher(),self.client_address)
414 self.request.shutdown(socket.SHUT_RDWR)
418 # With ssl connections, closing the filehandlers alone may not
419 # work because of ref counting. We explicitly tell the socket
421 MultiHTTPHandler.finish(self)
423 self.connection.shutdown(socket.SHUT_RDWR)
428 class ConnThreadingMixIn:
429 """Mix-in class to handle each _connection_ in a new thread.
431 This is necessary for persistent connections, where multiple
432 requests should be handled synchronously at each connection, but
433 multiple connections can run in parallel.
436 # Decides how threads will act upon termination of the
438 daemon_threads = False
440 def _handle_request_noblock(self):
441 """Start a new thread to process the request."""
442 if not threading: # happens while quitting python
444 t = threading.Thread(target = self._handle_request2)
445 if self.daemon_threads:
449 def _mark_start(self, thread):
450 """ Mark the start of a request thread """
453 def _mark_end(self, thread):
454 """ Mark the end of a request thread """
457 def _handle_request2(self):
458 """Handle one request, without blocking.
460 I assume that select.select has returned that the socket is
461 readable before this function was called, so there should be
462 no risk of blocking in get_request().
465 self._mark_start(threading.currentThread())
466 request, client_address = self.get_request()
468 self._mark_end(threading.currentThread())
470 if self.verify_request(request, client_address):
472 self.process_request(request, client_address)
474 self.handle_error(request, client_address)
475 self.close_request(request)
476 self._mark_end(threading.currentThread())