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SAE: Allow AP behavior for SAE Confirm to be configured

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hostapd is by default waiting STA to send SAE Confirm before sending the
SAE Confirm. This can now be configured with sae_confirm_immediate=1
resulting in hostapd sending out SAE Confirm immediately after sending
SAE Commit.

These are the two different message sequences:

sae_confirm_immediate=0
STA->AP: SAE Commit
AP->STA: SAE Commit
STA->AP: SAE Confirm
AP->STA: SAE Confirm
STA->AP: Association Request
AP->STA: Association Response

sae_confirm_immediate=1
STA->AP: SAE Commit
AP->STA: SAE Commit
AP->STA: SAE Confirm
STA->AP: SAE Confirm
STA->AP: Association Request
AP->STA: Association Response

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2019-10-10 15:38:26 +03:00 committed by Jouni Malinen
parent d6a7de60c8
commit f7fe055224
4 changed files with 20 additions and 7 deletions
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2
hostapd/config_file.c
View file

@ -4182,6 +4182,8 @@ static int hostapd_config_fill(struct hostapd_config *conf,
}
} else if (os_strcmp(buf, "sae_require_mfp") == 0) {
bss->sae_require_mfp = atoi(pos);
} else if (os_strcmp(buf, "sae_confirm_immediate") == 0) {
bss->sae_confirm_immediate = atoi(pos);
} else if (os_strcmp(buf, "local_pwr_constraint") == 0) {
int val = atoi(pos);
if (val < 0 || val > 255) {

7
hostapd/hostapd.conf
View file

@ -1743,6 +1743,13 @@ own_ip_addr=127.0.0.1
# MFP while SAE stations are required to negotiate MFP if sae_require_mfp=1.
#sae_require_mfp=0
# SAE Confirm behavior
# By default, AP will send out only SAE Commit message in response to a received
# SAE Commit message. This parameter can be set to 1 to override that behavior
# to send both SAE Commit and SAE Confirm messages without waiting for the STA
# to send its SAE Confirm message first.
#sae_confirm_immediate=0
# FILS Cache Identifier (16-bit value in hexdump format)
#fils_cache_id=0011

1
src/ap/ap_config.h
View file

@ -649,6 +649,7 @@ struct hostapd_bss_config {
unsigned int sae_anti_clogging_threshold;
unsigned int sae_sync;
int sae_require_mfp;
int sae_confirm_immediate;
int *sae_groups;
struct sae_password_entry *sae_passwords;

17
src/ap/ieee802_11.c
View file

@ -787,14 +787,17 @@ static int sae_sm_step(struct hostapd_data *hapd, struct sta_info *sta,
return WLAN_STATUS_UNSPECIFIED_FAILURE;
/*
* In mesh case, both Commit and Confirm can be sent
* immediately. In infrastructure BSS, only a single
* Authentication frame (Commit) is expected from the AP
* here and the second one (Confirm) will be sent once
* the STA has sent its second Authentication frame
* (Confirm).
* In mesh case, both Commit and Confirm are sent
* immediately. In infrastructure BSS, by default, only
* a single Authentication frame (Commit) is expected
* from the AP here and the second one (Confirm) will
* be sent once the STA has sent its second
* Authentication frame (Confirm). This behavior can be
* overridden with explicit configuration so that the
* infrastructure BSS case sends both frames together.
*/
if (hapd->conf->mesh & MESH_ENABLED) {
if ((hapd->conf->mesh & MESH_ENABLED) ||
hapd->conf->sae_confirm_immediate) {
/*
* Send both Commit and Confirm immediately
* based on SAE finite state machine