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Make GTK length validation for RSN Group 1/2 easier to analyze

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This extends the changes in commit c397eff828 ("Make GTK length
validation easier to analyze") to cover the RSN case as well as the WPA.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2020-11-03 20:23:48 +02:00 committed by Jouni Malinen
parent f14df9b56a
commit ec1f4f3c81
1 changed files with 18 additions and 10 deletions
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28
src/rsn_supp/wpa.c
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@ -1836,6 +1836,7 @@ static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
{ {
int maxkeylen; int maxkeylen;
struct wpa_eapol_ie_parse ie; struct wpa_eapol_ie_parse ie;
u16 gtk_len;
wpa_hexdump_key(MSG_DEBUG, "RSN: msg 1/2 key data", wpa_hexdump_key(MSG_DEBUG, "RSN: msg 1/2 key data",
keydata, keydatalen); keydata, keydatalen);
@ -1851,7 +1852,20 @@ static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
"WPA: No GTK IE in Group Key msg 1/2"); "WPA: No GTK IE in Group Key msg 1/2");
return -1; return -1;
} }
maxkeylen = gd->gtk_len = ie.gtk_len - 2; gtk_len = ie.gtk_len;
if (gtk_len < 2) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"RSN: Invalid GTK KDE length (%u) in Group Key msg 1/2",
gtk_len);
return -1;
}
gtk_len -= 2;
if (gtk_len > sizeof(gd->gtk)) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"RSN: Too long GTK in GTK KDE (len=%u)", gtk_len);
return -1;
}
maxkeylen = gd->gtk_len = gtk_len;
#ifdef CONFIG_OCV #ifdef CONFIG_OCV
if (wpa_sm_ocv_enabled(sm)) { if (wpa_sm_ocv_enabled(sm)) {
@ -1875,22 +1889,16 @@ static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
#endif /* CONFIG_OCV */ #endif /* CONFIG_OCV */
if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher, if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
gd->gtk_len, maxkeylen, gtk_len, maxkeylen,
&gd->key_rsc_len, &gd->alg)) &gd->key_rsc_len, &gd->alg))
return -1; return -1;
wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in group key handshake", wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in group key handshake",
ie.gtk, ie.gtk_len); ie.gtk, 2 + gtk_len);
gd->keyidx = ie.gtk[0] & 0x3; gd->keyidx = ie.gtk[0] & 0x3;
gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm, gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
!!(ie.gtk[0] & BIT(2))); !!(ie.gtk[0] & BIT(2)));
if (ie.gtk_len - 2 > sizeof(gd->gtk)) { os_memcpy(gd->gtk, ie.gtk + 2, gtk_len);
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"RSN: Too long GTK in GTK IE (len=%lu)",
(unsigned long) ie.gtk_len - 2);
return -1;
}
os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2);
if (ieee80211w_set_keys(sm, &ie) < 0) if (ieee80211w_set_keys(sm, &ie) < 0)
wpa_msg(sm->ctx->msg_ctx, MSG_INFO, wpa_msg(sm->ctx->msg_ctx, MSG_INFO,