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anqp: Ensure a random token is used

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This commit is contained in:
Denis Kenzior 2021-07-05 20:25:14 -05:00
parent 667023b01b
commit dcd48e1f66
1 changed files with 10 additions and 5 deletions
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15
src/anqp.c
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@ -53,8 +53,6 @@ struct anqp_request {
uint32_t id;
};
static uint8_t anqp_token = 0;
static void anqp_destroy(void *user_data)
{
struct anqp_request *request = user_data;
@ -185,6 +183,7 @@ static void anqp_frame_timeout(int error, void *user_data)
}
static uint8_t *anqp_build_frame(const uint8_t *addr, struct scan_bss *bss,
uint8_t anqp_token,
const uint8_t *anqp, size_t len,
size_t *len_out)
{
@ -202,7 +201,7 @@ static uint8_t *anqp_build_frame(const uint8_t *addr, struct scan_bss *bss,
*ptr++ = 0x04; /* Category: Public */
*ptr++ = 0x0a; /* Action: GAS initial Request */
*ptr++ = anqp_token++; /* Dialog Token */
*ptr++ = anqp_token; /* Dialog Token */
*ptr++ = IE_TYPE_ADVERTISEMENT_PROTOCOL;
*ptr++ = 2;
@ -233,10 +232,16 @@ uint32_t anqp_request(uint64_t wdev_id, const uint8_t *addr,
request->frequency = bss->frequency;
request->anqp_cb = cb;
request->anqp_destroy = destroy;
request->anqp_token = anqp_token;
/*
* WPA3 Specificiation version 3, Section 9.4:
* "A STA shall use a randomized dialog token for every new GAS
* exchange."
*/
l_getrandom(&request->anqp_token, sizeof(request->anqp_token));
request->anqp_data = user_data;
request->frame = anqp_build_frame(addr, bss, anqp, len,
request->frame = anqp_build_frame(addr, bss, request->anqp_token,
anqp, len,
&request->frame_len);
iov[0].iov_base = request->frame;