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https://github.com/vanhoefm/fragattacks.git
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c0a6190815
IEEE 802.11r KDF uses key length in the derivation and as such, the PTK length must be specified correctly. The previous version was deriving using 512-bit PTK regardless of the negotiated cipher suite; this works for TKIP, but not for CCMP. Update the code to use proper PTK length based on the pairwise cipher. This fixed PTK derivation for both IEEE 802.11r and IEEE 802.11w (when using AKMP that specifies SHA-256-based key derivation). The fixed version does not interoperate with the previous versions. [Bug 307]
222 lines
6.3 KiB
C
222 lines
6.3 KiB
C
/*
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* hostapd - IEEE 802.11i-2004 / WPA Authenticator: Internal definitions
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* Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#ifndef WPA_AUTH_I_H
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#define WPA_AUTH_I_H
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/* max(dot11RSNAConfigGroupUpdateCount,dot11RSNAConfigPairwiseUpdateCount) */
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#define RSNA_MAX_EAPOL_RETRIES 4
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struct wpa_group;
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struct wpa_stsl_negotiation {
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struct wpa_stsl_negotiation *next;
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u8 initiator[ETH_ALEN];
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u8 peer[ETH_ALEN];
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};
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struct wpa_state_machine {
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struct wpa_authenticator *wpa_auth;
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struct wpa_group *group;
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u8 addr[ETH_ALEN];
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enum {
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WPA_PTK_INITIALIZE, WPA_PTK_DISCONNECT, WPA_PTK_DISCONNECTED,
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WPA_PTK_AUTHENTICATION, WPA_PTK_AUTHENTICATION2,
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WPA_PTK_INITPMK, WPA_PTK_INITPSK, WPA_PTK_PTKSTART,
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WPA_PTK_PTKCALCNEGOTIATING, WPA_PTK_PTKCALCNEGOTIATING2,
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WPA_PTK_PTKINITNEGOTIATING, WPA_PTK_PTKINITDONE
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} wpa_ptk_state;
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enum {
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WPA_PTK_GROUP_IDLE = 0,
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WPA_PTK_GROUP_REKEYNEGOTIATING,
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WPA_PTK_GROUP_REKEYESTABLISHED,
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WPA_PTK_GROUP_KEYERROR
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} wpa_ptk_group_state;
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Boolean Init;
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Boolean DeauthenticationRequest;
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Boolean AuthenticationRequest;
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Boolean ReAuthenticationRequest;
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Boolean Disconnect;
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int TimeoutCtr;
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int GTimeoutCtr;
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Boolean TimeoutEvt;
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Boolean EAPOLKeyReceived;
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Boolean EAPOLKeyPairwise;
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Boolean EAPOLKeyRequest;
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Boolean MICVerified;
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Boolean GUpdateStationKeys;
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u8 ANonce[WPA_NONCE_LEN];
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u8 SNonce[WPA_NONCE_LEN];
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u8 PMK[PMK_LEN];
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struct wpa_ptk PTK;
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Boolean PTK_valid;
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Boolean pairwise_set;
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int keycount;
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Boolean Pair;
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struct {
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u8 counter[WPA_REPLAY_COUNTER_LEN];
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Boolean valid;
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} key_replay[RSNA_MAX_EAPOL_RETRIES];
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Boolean PInitAKeys; /* WPA only, not in IEEE 802.11i */
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Boolean PTKRequest; /* not in IEEE 802.11i state machine */
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Boolean has_GTK;
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Boolean PtkGroupInit; /* init request for PTK Group state machine */
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u8 *last_rx_eapol_key; /* starting from IEEE 802.1X header */
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size_t last_rx_eapol_key_len;
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unsigned int changed:1;
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unsigned int in_step_loop:1;
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unsigned int pending_deinit:1;
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unsigned int started:1;
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unsigned int mgmt_frame_prot:1;
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#ifdef CONFIG_IEEE80211R
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unsigned int ft_completed:1;
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unsigned int pmk_r1_name_valid:1;
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#endif /* CONFIG_IEEE80211R */
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u8 req_replay_counter[WPA_REPLAY_COUNTER_LEN];
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int req_replay_counter_used;
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u8 *wpa_ie;
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size_t wpa_ie_len;
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enum {
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WPA_VERSION_NO_WPA = 0 /* WPA not used */,
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WPA_VERSION_WPA = 1 /* WPA / IEEE 802.11i/D3.0 */,
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WPA_VERSION_WPA2 = 2 /* WPA2 / IEEE 802.11i */
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} wpa;
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int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
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int wpa_key_mgmt; /* the selected WPA_KEY_MGMT_* */
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struct rsn_pmksa_cache_entry *pmksa;
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u32 dot11RSNAStatsTKIPLocalMICFailures;
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u32 dot11RSNAStatsTKIPRemoteMICFailures;
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#ifdef CONFIG_IEEE80211R
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u8 xxkey[PMK_LEN]; /* PSK or the second 256 bits of MSK */
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size_t xxkey_len;
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u8 pmk_r1_name[WPA_PMK_NAME_LEN]; /* PMKR1Name derived from FT Auth
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* Request */
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u8 r0kh_id[FT_R0KH_ID_MAX_LEN]; /* R0KH-ID from FT Auth Request */
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size_t r0kh_id_len;
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#endif /* CONFIG_IEEE80211R */
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};
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/* per group key state machine data */
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struct wpa_group {
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struct wpa_group *next;
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int vlan_id;
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Boolean GInit;
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int GKeyDoneStations;
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Boolean GTKReKey;
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int GTK_len;
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int GN, GM;
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Boolean GTKAuthenticator;
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u8 Counter[WPA_NONCE_LEN];
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enum {
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WPA_GROUP_GTK_INIT = 0,
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WPA_GROUP_SETKEYS, WPA_GROUP_SETKEYSDONE
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} wpa_group_state;
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u8 GMK[WPA_GMK_LEN];
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u8 GTK[2][WPA_GTK_MAX_LEN];
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u8 GNonce[WPA_NONCE_LEN];
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Boolean changed;
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#ifdef CONFIG_IEEE80211W
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u8 IGTK[2][WPA_IGTK_LEN];
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int GN_igtk, GM_igtk;
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#endif /* CONFIG_IEEE80211W */
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};
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struct wpa_ft_pmk_cache;
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/* per authenticator data */
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struct wpa_authenticator {
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struct wpa_group *group;
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unsigned int dot11RSNAStatsTKIPRemoteMICFailures;
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u32 dot11RSNAAuthenticationSuiteSelected;
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u32 dot11RSNAPairwiseCipherSelected;
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u32 dot11RSNAGroupCipherSelected;
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u8 dot11RSNAPMKIDUsed[PMKID_LEN];
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u32 dot11RSNAAuthenticationSuiteRequested; /* FIX: update */
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u32 dot11RSNAPairwiseCipherRequested; /* FIX: update */
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u32 dot11RSNAGroupCipherRequested; /* FIX: update */
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unsigned int dot11RSNATKIPCounterMeasuresInvoked;
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unsigned int dot11RSNA4WayHandshakeFailures;
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struct wpa_stsl_negotiation *stsl_negotiations;
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struct wpa_auth_config conf;
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struct wpa_auth_callbacks cb;
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u8 *wpa_ie;
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size_t wpa_ie_len;
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u8 addr[ETH_ALEN];
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struct rsn_pmksa_cache *pmksa;
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struct wpa_ft_pmk_cache *ft_pmk_cache;
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};
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int wpa_write_rsn_ie(struct wpa_auth_config *conf, u8 *buf, size_t len,
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const u8 *pmkid);
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void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
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logger_level level, const char *txt);
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void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
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logger_level level, const char *fmt, ...);
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void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
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struct wpa_state_machine *sm, int key_info,
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const u8 *key_rsc, const u8 *nonce,
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const u8 *kde, size_t kde_len,
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int keyidx, int encr, int force_version);
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int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
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int (*cb)(struct wpa_state_machine *sm, void *ctx),
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void *cb_ctx);
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int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
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int (*cb)(struct wpa_authenticator *a, void *ctx),
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void *cb_ctx);
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#ifdef CONFIG_PEERKEY
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int wpa_stsl_remove(struct wpa_authenticator *wpa_auth,
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struct wpa_stsl_negotiation *neg);
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void wpa_smk_error(struct wpa_authenticator *wpa_auth,
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struct wpa_state_machine *sm, struct wpa_eapol_key *key);
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void wpa_smk_m1(struct wpa_authenticator *wpa_auth,
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struct wpa_state_machine *sm, struct wpa_eapol_key *key);
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void wpa_smk_m3(struct wpa_authenticator *wpa_auth,
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struct wpa_state_machine *sm, struct wpa_eapol_key *key);
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#endif /* CONFIG_PEERKEY */
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#ifdef CONFIG_IEEE80211R
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int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len);
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int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
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struct wpa_ptk *ptk, size_t ptk_len);
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struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void);
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void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache);
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#endif /* CONFIG_IEEE80211R */
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#endif /* WPA_AUTH_I_H */
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