Commit Graph

3 Commits

Author SHA1 Message Date
Lukas Reschke bc6d17ed74 Add check for availability of /dev/urandom
Without /dev/urandom being available to read the medium RNG will rely only on the following components on a Linux system:

1. MicroTime: microtime() . memory_get_usage() as seed and then a garbage collected microtime for loop
2. MTRand: chr((mt_rand() ^ mt_rand()) % 256)
3. Rand: chr((rand() ^ rand()) % 256)
4. UniqId: Plain uniqid()

An adversary with the possibility to predict the seed used by the PHP process may thus be able to predict future tokens which is an unwanted behaviour.

One should note that this behaviour is documented in our documentation to ensure that users get aware of this even without reading our documentation this will add a post setup check to the administrative interface.

Thanks to David Black from d1b.org for bringing this again to our attention.
2015-05-26 14:16:07 +02:00
Joas Schilling 81ec1c8a1a Remove hardcoded link to performance docs 2015-04-07 12:25:30 +02:00
Lukas Reschke 65202d2a18 Add check for activated local memcache
Also used the opportunity to refactor it into an AppFramework controller so that we can unit test it.

Fixes https://github.com/owncloud/core/issues/14956
2015-03-28 13:59:22 +01:00