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DPP2: Update Reconfig Flags attribute format

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This was simplified by replacing the JSON encoded value with a single
octet.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2020-08-10 17:36:56 +03:00 committed by Jouni Malinen
parent 57e2e5ed7a
commit 66ffe9d246
1 changed files with 11 additions and 49 deletions
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60
src/common/dpp_reconfig.c
View file

@ -563,40 +563,19 @@ fail:
}
static struct wpabuf *
dpp_build_reconfig_flags(enum dpp_connector_key connector_key)
{
struct wpabuf *json;
json = wpabuf_alloc(100);
if (!json)
return NULL;
json_start_object(json, NULL);
json_add_int(json, "connectorKey", connector_key);
json_end_object(json);
wpa_hexdump_ascii(MSG_DEBUG, "DPP: Reconfig-Flags JSON",
wpabuf_head(json), wpabuf_len(json));
return json;
}
struct wpabuf *
dpp_reconfig_build_conf(struct dpp_authentication *auth)
{
struct wpabuf *msg = NULL, *clear = NULL, *reconfig_flags;
struct wpabuf *msg = NULL, *clear;
u8 *attr_start, *attr_end;
size_t clear_len, attr_len, len[2];
const u8 *addr[2];
u8 *wrapped;
reconfig_flags = dpp_build_reconfig_flags(DPP_CONFIG_REPLACEKEY);
if (!reconfig_flags)
goto fail;
u8 flags;
/* Build DPP Reconfig Authentication Confirm frame attributes */
clear_len = 4 + 1 + 4 + 1 + 2 * (4 + auth->curve->nonce_len) +
4 + wpabuf_len(reconfig_flags);
4 + 1;
clear = wpabuf_alloc(clear_len);
if (!clear)
goto fail;
@ -622,9 +601,10 @@ dpp_reconfig_build_conf(struct dpp_authentication *auth)
wpabuf_put_data(clear, auth->r_nonce, auth->curve->nonce_len);
/* Reconfig-Flags (wrapped) */
flags = DPP_CONFIG_REPLACEKEY;
wpabuf_put_le16(clear, DPP_ATTR_RECONFIG_FLAGS);
wpabuf_put_le16(clear, wpabuf_len(reconfig_flags));
wpabuf_put_buf(clear, reconfig_flags);
wpabuf_put_le16(clear, 1);
wpabuf_put_u8(clear, flags);
attr_len = 4 + wpabuf_len(clear) + AES_BLOCK_SIZE;
attr_len += 4 + 1;
@ -665,7 +645,6 @@ dpp_reconfig_build_conf(struct dpp_authentication *auth)
msg);
out:
wpabuf_free(reconfig_flags);
wpabuf_free(clear);
return msg;
fail:
@ -872,8 +851,8 @@ int dpp_reconfig_auth_conf_rx(struct dpp_authentication *auth, const u8 *hdr,
size_t len[2];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
struct json_token *root = NULL, *token;
int res = -1;
u8 flags;
if (!auth->reconfig || auth->configurator)
goto fail;
@ -967,34 +946,17 @@ int dpp_reconfig_auth_conf_rx(struct dpp_authentication *auth, const u8 *hdr,
reconfig_flags = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_RECONFIG_FLAGS,
&reconfig_flags_len);
if (!reconfig_flags) {
if (!reconfig_flags || reconfig_flags_len < 1) {
dpp_auth_fail(auth, "Missing or invalid Reconfig-Flags");
goto fail;
}
wpa_hexdump_ascii(MSG_DEBUG, "DPP: Reconfig-Flags",
reconfig_flags, reconfig_flags_len);
root = json_parse((const char *) reconfig_flags, reconfig_flags_len);
if (!root) {
dpp_auth_fail(auth, "Could not parse Reconfig-Flags");
goto fail;
}
token = json_get_member(root, "connectorKey");
if (!token || token->type != JSON_NUMBER) {
dpp_auth_fail(auth, "No connectorKey in Reconfig-Flags");
goto fail;
}
if (token->number != DPP_CONFIG_REUSEKEY &&
token->number != DPP_CONFIG_REPLACEKEY) {
dpp_auth_fail(auth,
"Unsupported connectorKey value in Reconfig-Flags");
goto fail;
}
auth->reconfig_connector_key = token->number;
flags = reconfig_flags[0] & BIT(0);
wpa_printf(MSG_DEBUG, "DPP: Reconfig Flags connectorKey=%u", flags);
auth->reconfig_connector_key = flags;
auth->reconfig_success = true;
res = 0;
fail:
json_free(root);
bin_clear_free(unwrapped, unwrapped_len);
return res;
}