Commit graph

10 commits

Author SHA1 Message Date
Jouni Malinen
46690a3b9b Added an optional mitigation mechanism for certain attacks against TKIP by
delaying Michael MIC error reports by a random amount of time between 0 and
60 seconds if multiple Michael MIC failures are detected with the same PTK
(i.e., the Authenticator does not rekey PTK on first failure report). This
is disabled by default and can be enabled with a build option
CONFIG_DELAYED_MIC_ERROR_REPORT=y in .config.

This may help in making a chopchop attack take much longer time by forcing
the attacker to wait 60 seconds before knowing whether a modified frame
resulted in a MIC failure.
2008-11-08 04:43:12 +02:00
Jouni Malinen
581a8cde77 Added support for enforcing frequent PTK rekeying
Added a new configuration option, wpa_ptk_rekey, that can be used to
enforce frequent PTK rekeying, e.g., to mitigate some attacks against TKIP
deficiencies. This can be set either by the Authenticator (to initiate
periodic 4-way handshake to rekey PTK) or by the Supplicant (to request
Authenticator to rekey PTK).

With both wpa_ptk_rekey and wpa_group_rekey (in hostapd) set to 600, TKIP
keys will not be used for more than 10 minutes which may make some attacks
against TKIP more difficult to implement.
2008-11-06 19:57:21 +02:00
Jouni Malinen
0930209dc2 Register a quick auth timeout if EAPOL fails to avoid long waits
This may be needed if the AP does not disconnect in case of EAP-FAST
unauthenticated provisioning (EAP-Failure). Adding the local short timeout
will speed up the process in such a case by reducing the wait (which can
often be up to 60 seconds).
2008-10-02 17:27:24 +03:00
Jouni Malinen
c08b9180cd Save config after blob updates from EAP (if update_config=1)
This allows EAP-FAST PAC updates to be stored when using config blobs
instead of external files.
2008-10-02 14:10:53 +03:00
Jouni Malinen
565861976d Added support for using SHA256-based stronger key derivation for WPA2
IEEE 802.11w/D6.0 defines new AKMPs to indicate SHA256-based algorithms for
key derivation (and AES-CMAC for EAPOL-Key MIC). Add support for using new
AKMPs and clean up AKMP processing with helper functions in defs.h.
2008-08-31 22:57:28 +03:00
Michael Bernhard
886a807fb5 Make proactive key caching working again
Function 'wpa_sm_set_config' used the argument 'config' as the network
context which is a pointer to a local variable of the function
'wpa_supplicant_rsn_supp_set_config'.

This is one reason why no proactive key was generated. This network
context never matched with the network context saved in the pmksa cache
entries.

The structure 'rsn_supp_config' has already a member 'network_ctx' which
is now filled in by this patch with 'ssid'.

Signed-off-by: Michael Bernhard <michael.bernhard@bfh.ch>
2008-07-06 10:50:53 +03:00
Jouni Malinen
3e2ad1b932 Fixed race condition between disassociation event and group key handshake
This avoids getting stuck in state where wpa_supplicant has canceled scans,
but the driver is actually in disassociated state. The previously used code
that controlled scan timeout from WPA module is not really needed anymore
(and has not been needed for past four years since authentication timeout
was separated from scan request timeout), so this can simply be removed to
resolved the race condition. As an extra bonus, this simplifies the
interface to WPA module.
[Bug 261]
2008-06-09 16:26:47 +03:00
Jouni Malinen
a8e16edc86 Introduced new helper function is_zero_ether_addr()
Use this inline function to replace os_memcmp(addr,
"\x00\x00\x00\x00\x00\x00", ETH_ALEN) == 0.
2008-06-03 18:08:48 +03:00
Henrik Brix Andersen
a6a89fea36 Fix compilation without IEEE8021X_EAPOL defined 2008-04-28 17:06:43 +03:00
Jouni Malinen
6fc6879bd5 Re-initialize hostapd/wpa_supplicant git repository based on 0.6.3 release 2008-02-27 17:34:43 -08:00