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rebased-v2.6-0003-Extend-protection-of-GTK-IGTK...
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File rebased-v2.6-0003-Extend-protection-of-GTK-IGTK-reinstallation-of-WNM-.patch of Package hostapd.8998
From 8280294e74846ea342389a0cd17215050fa5afe8 Mon Sep 17 00:00:00 2001 From: Jouni Malinen <j@w1.fi> Date: Sun, 1 Oct 2017 12:12:24 +0300 Subject: [PATCH 3/8] Extend protection of GTK/IGTK reinstallation of WNM-Sleep Mode cases This extends the protection to track last configured GTK/IGTK value separately from EAPOL-Key frames and WNM-Sleep Mode frames to cover a corner case where these two different mechanisms may get used when the GTK/IGTK has changed and tracking a single value is not sufficient to detect a possible key reconfiguration. Signed-off-by: Jouni Malinen <j@w1.fi> --- src/rsn_supp/wpa.c | 53 +++++++++++++++++++++++++++++++++++++--------------- src/rsn_supp/wpa_i.h | 2 ++ 2 files changed, 40 insertions(+), 15 deletions(-) diff --git a/src/rsn_supp/wpa.c b/src/rsn_supp/wpa.c index 95bd7be..7a2c68d 100644 --- a/src/rsn_supp/wpa.c +++ b/src/rsn_supp/wpa.c @@ -709,14 +709,17 @@ struct wpa_gtk_data { static int wpa_supplicant_install_gtk(struct wpa_sm *sm, const struct wpa_gtk_data *gd, - const u8 *key_rsc) + const u8 *key_rsc, int wnm_sleep) { const u8 *_gtk = gd->gtk; u8 gtk_buf[32]; /* Detect possible key reinstallation */ - if (sm->gtk.gtk_len == (size_t) gd->gtk_len && - os_memcmp(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len) == 0) { + if ((sm->gtk.gtk_len == (size_t) gd->gtk_len && + os_memcmp(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len) == 0) || + (sm->gtk_wnm_sleep.gtk_len == (size_t) gd->gtk_len && + os_memcmp(sm->gtk_wnm_sleep.gtk, gd->gtk, + sm->gtk_wnm_sleep.gtk_len) == 0)) { wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Not reinstalling already in-use GTK to the driver (keyidx=%d tx=%d len=%d)", gd->keyidx, gd->tx, gd->gtk_len); @@ -757,8 +760,14 @@ static int wpa_supplicant_install_gtk(struct wpa_sm *sm, } os_memset(gtk_buf, 0, sizeof(gtk_buf)); - sm->gtk.gtk_len = gd->gtk_len; - os_memcpy(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len); + if (wnm_sleep) { + sm->gtk_wnm_sleep.gtk_len = gd->gtk_len; + os_memcpy(sm->gtk_wnm_sleep.gtk, gd->gtk, + sm->gtk_wnm_sleep.gtk_len); + } else { + sm->gtk.gtk_len = gd->gtk_len; + os_memcpy(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len); + } return 0; } @@ -852,7 +861,7 @@ static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm, (wpa_supplicant_check_group_cipher(sm, sm->group_cipher, gtk_len, gtk_len, &gd.key_rsc_len, &gd.alg) || - wpa_supplicant_install_gtk(sm, &gd, key_rsc))) { + wpa_supplicant_install_gtk(sm, &gd, key_rsc, 0))) { wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: Failed to install GTK"); os_memset(&gd, 0, sizeof(gd)); @@ -868,14 +877,18 @@ static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm, #ifdef CONFIG_IEEE80211W static int wpa_supplicant_install_igtk(struct wpa_sm *sm, - const struct wpa_igtk_kde *igtk) + const struct wpa_igtk_kde *igtk, + int wnm_sleep) { size_t len = wpa_cipher_key_len(sm->mgmt_group_cipher); u16 keyidx = WPA_GET_LE16(igtk->keyid); /* Detect possible key reinstallation */ - if (sm->igtk.igtk_len == len && - os_memcmp(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len) == 0) { + if ((sm->igtk.igtk_len == len && + os_memcmp(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len) == 0) || + (sm->igtk_wnm_sleep.igtk_len == len && + os_memcmp(sm->igtk_wnm_sleep.igtk, igtk->igtk, + sm->igtk_wnm_sleep.igtk_len) == 0)) { wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Not reinstalling already in-use IGTK to the driver (keyidx=%d)", keyidx); @@ -900,8 +913,14 @@ static int wpa_supplicant_install_igtk(struct wpa_sm *sm, return -1; } - sm->igtk.igtk_len = len; - os_memcpy(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len); + if (wnm_sleep) { + sm->igtk_wnm_sleep.igtk_len = len; + os_memcpy(sm->igtk_wnm_sleep.igtk, igtk->igtk, + sm->igtk_wnm_sleep.igtk_len); + } else { + sm->igtk.igtk_len = len; + os_memcpy(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len); + } return 0; } @@ -924,7 +943,7 @@ static int ieee80211w_set_keys(struct wpa_sm *sm, return -1; igtk = (const struct wpa_igtk_kde *) ie->igtk; - if (wpa_supplicant_install_igtk(sm, igtk) < 0) + if (wpa_supplicant_install_igtk(sm, igtk, 0) < 0) return -1; } @@ -1574,7 +1593,7 @@ static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm, if (wpa_supplicant_rsc_relaxation(sm, key->key_rsc)) key_rsc = null_rsc; - if (wpa_supplicant_install_gtk(sm, &gd, key_rsc) || + if (wpa_supplicant_install_gtk(sm, &gd, key_rsc, 0) || wpa_supplicant_send_2_of_2(sm, key, ver, key_info) < 0) goto failed; os_memset(&gd, 0, sizeof(gd)); @@ -2386,8 +2405,10 @@ void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid) sm->tptk_set = 0; os_memset(&sm->tptk, 0, sizeof(sm->tptk)); os_memset(&sm->gtk, 0, sizeof(sm->gtk)); + os_memset(&sm->gtk_wnm_sleep, 0, sizeof(sm->gtk_wnm_sleep)); #ifdef CONFIG_IEEE80211W os_memset(&sm->igtk, 0, sizeof(sm->igtk)); + os_memset(&sm->igtk_wnm_sleep, 0, sizeof(sm->igtk_wnm_sleep)); #endif /* CONFIG_IEEE80211W */ } @@ -2920,8 +2941,10 @@ void wpa_sm_drop_sa(struct wpa_sm *sm) os_memset(&sm->ptk, 0, sizeof(sm->ptk)); os_memset(&sm->tptk, 0, sizeof(sm->tptk)); os_memset(&sm->gtk, 0, sizeof(sm->gtk)); + os_memset(&sm->gtk_wnm_sleep, 0, sizeof(sm->gtk_wnm_sleep)); #ifdef CONFIG_IEEE80211W os_memset(&sm->igtk, 0, sizeof(sm->igtk)); + os_memset(&sm->igtk_wnm_sleep, 0, sizeof(sm->igtk_wnm_sleep)); #endif /* CONFIG_IEEE80211W */ #ifdef CONFIG_IEEE80211R os_memset(sm->xxkey, 0, sizeof(sm->xxkey)); @@ -2986,7 +3009,7 @@ int wpa_wnmsleep_install_key(struct wpa_sm *sm, u8 subelem_id, u8 *buf) wpa_hexdump_key(MSG_DEBUG, "Install GTK (WNM SLEEP)", gd.gtk, gd.gtk_len); - if (wpa_supplicant_install_gtk(sm, &gd, key_rsc)) { + if (wpa_supplicant_install_gtk(sm, &gd, key_rsc, 1)) { os_memset(&gd, 0, sizeof(gd)); wpa_printf(MSG_DEBUG, "Failed to install the GTK in " "WNM mode"); @@ -2998,7 +3021,7 @@ int wpa_wnmsleep_install_key(struct wpa_sm *sm, u8 subelem_id, u8 *buf) const struct wpa_igtk_kde *igtk; igtk = (const struct wpa_igtk_kde *) (buf + 2); - if (wpa_supplicant_install_igtk(sm, igtk) < 0) + if (wpa_supplicant_install_igtk(sm, igtk, 1) < 0) return -1; #endif /* CONFIG_IEEE80211W */ } else { diff --git a/src/rsn_supp/wpa_i.h b/src/rsn_supp/wpa_i.h index afc9e37..9a54631 100644 --- a/src/rsn_supp/wpa_i.h +++ b/src/rsn_supp/wpa_i.h @@ -32,8 +32,10 @@ struct wpa_sm { int rx_replay_counter_set; u8 request_counter[WPA_REPLAY_COUNTER_LEN]; struct wpa_gtk gtk; + struct wpa_gtk gtk_wnm_sleep; #ifdef CONFIG_IEEE80211W struct wpa_igtk igtk; + struct wpa_igtk igtk_wnm_sleep; #endif /* CONFIG_IEEE80211W */ struct eapol_sm *eapol; /* EAPOL state machine from upper level code */ -- 2.7.4
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