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# $Id: session.py,v 1.9 2003/01/02 23:24:44 jribbens Exp $
import time, hmac, sha, Cookie, re, random, os, errno, fcntl
try:
import cPickle as pickle
except ImportError:
import pickle
class Error(Exception):
pass
class Session(dict):
def _make_hash(self, sid, secret):
"""Create a hash for 'sid'
This function may be overridden by subclasses."""
return hmac.new(secret, sid, sha).hexdigest()[:8]
def _create(self, secret):
"""Create a new session ID and, optionally hash
This function must insert the new session ID (which must be 8 hexadecimal
characters) into self["id"].
It may optionally insert the hash into self["hash"]. If it doesn't, then
_make_hash will automatically be called later.
This function may be overridden by subclasses.
"""
rnd = str(time.time()) + str(random.random()) + \
str(self._req.environ.get("UNIQUE_ID"))
self["id"] = sha.new(rnd).hexdigest()[:8]
def _load(self):
"""Load the session dictionary from somewhere
This function may be overridden by subclasses.
It should return 1 if the load was successful, or 0 if the session could
not be found. Any other type of error should raise an exception as usual."""
return 1
def save(self):
"""Save the session dictionary to somewhere
This function may be overridden by subclasses."""
pass
def tidy():
pass
tidy = staticmethod(tidy)
def __init__(self, req, secret, cookie="jonsid", url=0, root="",
referer=None, sid=None, shash=None):
dict.__init__(self)
self["id"] = None
self._req = req
self.relocated = 0
self.new = 0
# try and determine existing session id
if sid is not None:
self["id"] = sid
if shash is None:
self["hash"] = self._make_hash(self["id"], secret)
else:
self["hash"] = shash
if self["hash"] != self._make_hash(self["id"], secret):
self["id"] = None
if cookie and self._req.cookies.has_key(cookie):
self["id"] = self._req.cookies[cookie].value[:8]
self["hash"] = self._req.cookies[cookie].value[8:]
if self["hash"] != self._make_hash(self["id"], secret):
self["id"] = None
if url:
for i in xrange(1, 4):
requrl = self._req.environ.get("REDIRECT_" * i + "SESSION")
if requrl:
break
if requrl and self["id"] is None:
self["id"] = requrl[:8]
self["hash"] = requrl[8:]
if self["hash"] != self._make_hash(self["id"], secret):
self["id"] = None
# check the session
if referer:
if self._req.environ.has_key("HTTP_REFERER"):
if self._req.environ["HTTP_REFERER"].find(referer) == -1:
self["id"] = None
# try and load the session
if self["id"] is not None:
if not self._load():
self["id"] = None
# if no session was available and loaded, create a new one
if self["id"] is None:
if self.has_key("hash"):
del self["hash"]
self.created = time.time()
self.new = 1
self._create(secret)
if not self.has_key("hash"):
self["hash"] = self._make_hash(self["id"], secret)
if cookie:
c = Cookie.SimpleCookie()
c[cookie] = self["id"] + self["hash"]
c[cookie]["path"] = root + "/"
self._req.add_header("Set-Cookie", c[cookie].OutputString())
# if using url-based sessions, redirect if necessary
if url:
if not requrl or self["id"] != requrl[:8] or self["hash"] != requrl[8:]:
requrl = self._req.environ["REQUEST_URI"][len(root):]
requrl = re.sub("^/[A-Fa-f0-9]{16}/", "/", requrl)
self._req.add_header("Location", "http://" +
self._req.environ["SERVER_NAME"] + root + "/" + self["id"] +
self["hash"] + requrl)
self.relocated = 1
self.surl = root + "/" + self["id"] + self["hash"] + "/"
class FileSession(Session):
def _create(self, secret):
while 1:
Session._create(self, secret)
try:
os.lstat("%s/%s" % (self.basedir, self["id"][:2]))
except OSError, x:
if x[0] == errno.ENOENT:
os.mkdir("%s/%s" % (self.basedir, self["id"][:2]), 0700)
try:
fd = os.open("%s/%s/%s" % (self.basedir, self["id"][:2],
self["id"][2:]), os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0700)
except OSError, x:
if x[0] != errno.EEXIST:
raise
continue
f = os.fdopen(fd, "wb")
f.write("%d\n" % self.created)
pickle.dump({}, f, 1)
f.flush()
break
def _load(self):
try:
f = open("%s/%s/%s" % (self.basedir, self["id"][:2], self["id"][2:]),
"r+b")
except IOError, x:
if x[0] != errno.ENOENT:
raise
return 0
fcntl.lockf(f.fileno(), fcntl.LOCK_EX)
self.created = int(f.readline().strip())
self.update(pickle.load(f))
return 1
def save(self):
f = open("%s/%s/%s" % (self.basedir, self["id"][:2], self["id"][2:]), "r+b")
fcntl.lockf(f.fileno(), fcntl.LOCK_EX)
f.write("%d\n" % self.created)
pickle.dump(self.copy(), f, 1)
f.flush()
f.truncate()
def tidy(cls, max_idle=0, max_age=0, basedir=None):
if not max_idle and not max_age:
return
basedir = cls._find_basedir(basedir)
now = time.time()
for d in os.listdir(basedir):
if len(d) != 2 or not d.isalnum():
continue
for f in os.listdir("%s/%s" % (basedir, d)):
if len(f) != 6 or not f.isalnum():
continue
p = "%s/%s/%s" % (basedir, d, f)
if (max_idle and os.lstat(p).st_mtime < now - max_idle) or \
(max_age and int(open(p, "rb").readline().strip()) < now - max_age):
os.remove(p)
tidy = classmethod(tidy)
def _find_basedir(basedir):
if basedir is None:
basedir = os.environ.get("TMPDIR", "/tmp")
while basedir[-1] == "/":
basedir = basedir[:-1]
basedir = "%s/jon-sessions-%d" % (basedir, os.getuid())
try:
st = os.lstat(basedir)
if st[4] != os.getuid():
raise Error, "Sessions basedir is not owned by user %d" % os.getuid()
except OSError, x:
if x[0] == errno.ENOENT:
os.mkdir(basedir, 0700)
return basedir
_find_basedir = staticmethod(_find_basedir)
def __init__(self, req, secret, basedir=None, **kwargs):
self.basedir = self._find_basedir(basedir)
Session.__init__(self, req, secret, **kwargs)
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