89
89
self.headers = {} # Header names : values
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def execute_cgi(interpreter, uid, jail_dir, working_dir, script_path,
91
def execute_cgi(interpreter, trampoline, uid, jail_dir, working_dir,
92
script_path, req, gentle):
94
94
trampoline: Full path on the local system to the CGI wrapper program
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# usage: tramp uid jail_dir working_dir script_path
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pid = subprocess.Popen(
143
[trampoline, str(uid), req.config['paths']['jails']['mounts'],
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req.config['paths']['jails']['src'],
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req.config['paths']['jails']['template'],
146
jail_dir, working_dir, interpreter, script_path],
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[trampoline, str(uid), jail_dir, working_dir, interpreter,
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143
stdin=f, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
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342
""" % (warning, text))
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location_cgi_python = os.path.join(ivle.conf.lib_path, "trampoline")
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# Mapping of interpreter names (as given in conf/app/server.py) to
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# interpreter functions.
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349
interpreter_objects = {
353
: functools.partial(execute_cgi, "/usr/bin/python"),
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: functools.partial(execute_cgi, "/usr/bin/python",
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location_cgi_python),
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: functools.partial(execute_cgi, None),
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: functools.partial(execute_cgi, None,
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location_cgi_python),
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# Should also have:
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# python-server-page
403
403
if script_path and script_path.startswith('/home'):
404
404
normscript = os.path.normpath(script_path)
406
uri_into_jail = studpath.to_home_path(os.path.normpath(req.path))
406
uri_into_jail = studpath.url_to_jailpaths(os.path.normpath(req.path))[2]
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# PATH_INFO is wrong because the script doesn't physically exist.
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env['PATH_INFO'] = uri_into_jail[len(normscript):]
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413
# SERVER_SOFTWARE is actually not Apache but IVLE, since we are
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# custom-making the CGI request.
415
env['SERVER_SOFTWARE'] = "IVLE/" + ivle.__version__
415
env['SERVER_SOFTWARE'] = "IVLE/" + str(ivle.conf.ivle_version)
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# Additional environment variables
418
username = split_path(req.path)[0]
418
username = studpath.url_to_jailpaths(req.path)[0]
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419
env['HOME'] = os.path.join('/home', username)
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421
class ExecutionError(Exception):
424
def execute_raw(config, user, jail_dir, working_dir, binary, args):
424
def execute_raw(user, jail_dir, working_dir, binary, args):
425
425
'''Execute a binary in a user's jail, returning the raw output.
427
427
The binary is executed in the given working directory with the given
428
428
args. A tuple of (stdout, stderr) is returned.
431
tramp = os.path.join(config['paths']['lib'], 'trampoline')
432
tramp_dir = os.path.split(tramp)[0]
431
tramp = location_cgi_python
432
tramp_dir = os.path.split(location_cgi_python)[0]
434
434
# Fire up trampoline. Vroom, vroom.
435
435
proc = subprocess.Popen(
436
[tramp, str(user.unixid), config['paths']['jails']['mounts'],
437
config['paths']['jails']['src'],
438
config['paths']['jails']['template'],
439
jail_dir, working_dir, binary] + args,
436
[tramp, str(user.unixid), jail_dir, working_dir, binary] + args,
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stdin=subprocess.PIPE, stdout=subprocess.PIPE,
441
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stderr=subprocess.PIPE, cwd=tramp_dir, close_fds=True)
443
(stdout, stderr) = proc.communicate()
444
exitcode = proc.returncode
439
exitcode = proc.wait()
446
441
if exitcode != 0:
447
442
raise ExecutionError('subprocess ended with code %d, stderr %s' %
448
443
(exitcode, proc.stderr.read()))
449
return (stdout, stderr)
444
return (proc.stdout.read(), proc.stderr.read())