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authorKali Kaneko <kali@leap.se>2017-02-22 14:47:07 +0100
committerdrebs <drebs@leap.se>2017-04-04 18:27:31 +0200
commit4567d075fa342ad50e92d7822f4663428f70b59c (patch)
tree227fb43685103b34fb682fa185f4ff7d9f49d866 /server/src/leap
parent64071964e02fe730fdd62602ec40c93bc7813f7a (diff)
[feature] implement basic fs quota per user
this is simplistic, but adds a minimal protection against trivial DoS. the call to the ps command should be fast, but could use some profiling for the case of some ten of thousands files. - Resolves: #8778
Diffstat (limited to 'server/src/leap')
-rw-r--r--server/src/leap/soledad/server/_blobs.py33
1 files changed, 28 insertions, 5 deletions
diff --git a/server/src/leap/soledad/server/_blobs.py b/server/src/leap/soledad/server/_blobs.py
index 6ff0de4b..847ee755 100644
--- a/server/src/leap/soledad/server/_blobs.py
+++ b/server/src/leap/soledad/server/_blobs.py
@@ -24,7 +24,7 @@ Clients should be able to opt-in util the feature is complete.
A more performant BlobsBackend can (and should) be implemented for production
environments.
"""
-
+import commands
import os
from twisted.web import static
@@ -42,7 +42,6 @@ __all__ = ['BlobsResource', 'blobs_resource']
# TODO some error handling needed
# [ ] make path configurable
# [ ] sanitize path
-# [ ] implement basic quota (and raise a QuotaExceeded if limit reached!)
# for the future:
# [ ] isolate user avatar in a safer way
@@ -90,19 +89,28 @@ class IBlobsBackend(Interface):
class FilesystemBlobsBackend(object):
path = '/tmp/blobs/'
+ quota = 200 * 1024 # in KB
def read_blob(self, user, blob_id, request):
print "USER", user
print "BLOB_ID", blob_id
- path = self.get_path(user, blob_id)
+ path = self._get_path(user, blob_id)
print "READ FROM", path
_file = static.File(path, defaultType='application/octet-stream')
return _file.render_GET(request)
def write_blob(self, user, blob_id, request):
- path = self.get_path(user, blob_id)
+ path = self._get_path(user, blob_id)
if os.path.isfile(path):
+ # XXX return some 5xx code
raise BlobAlreadyExists()
+ used = self.get_total_storage(user)
+ if used > self.quota:
+ print "Error 507: Quota exceeded for user:", user
+ request.setResponseCode(507)
+ request.write('Quota Exceeded!')
+ request.finish()
+ return NOT_DONE_YET
try:
os.makedirs(os.path.split(path)[0])
except:
@@ -113,7 +121,22 @@ class FilesystemBlobsBackend(object):
d.addCallback(lambda _: request.finish())
return NOT_DONE_YET
- def get_path(self, user, blob_id):
+ def get_total_storage(self, user):
+ return self._get_disk_usage(os.path.join(self.path, user))
+
+ def delete_blob(user, blob_id):
+ raise NotImplementedError
+
+ def get_blob_size(user, blob_id):
+ raise NotImplementedError
+
+ def _get_disk_usage(self, start_path):
+ assert os.path.isdir(start_path)
+ cmd = 'du -c %s | tail -n 1' % start_path
+ size = commands.getoutput(cmd).split()[0]
+ return int(size)
+
+ def _get_path(self, user, blob_id):
parts = [user]
parts += [blob_id[0], blob_id[0:3], blob_id[0:6]]
parts += [blob_id]