DPP: Move PKEX Commit-Reveal Response building to a helper function
This cleans up dpp_pkex_rx_commit_reveal_req() a bit and makes it easier to add protocol testing functionality to PKEX exchange similarly to the previously added DPP Authentication case. Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen
Jouni Malinen
parent
b0626c2a6b
commit
b3e4cc5cbb
1 changed files with 78 additions and 53 deletions
131
src/common/dpp.c
131
src/common/dpp.c
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@ -6155,6 +6155,80 @@ fail:
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}
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static struct wpabuf *
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dpp_pkex_build_commit_reveal_resp(struct dpp_pkex *pkex,
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const struct wpabuf *B_pub, const u8 *v)
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{
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const struct dpp_curve_params *curve = pkex->own_bi->curve;
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struct wpabuf *msg = NULL;
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const u8 *addr[2];
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size_t len[2];
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u8 octet;
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u8 *wrapped;
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struct wpabuf *clear = NULL;
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size_t clear_len, attr_len;
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/* {B, v [bootstrapping info]}z */
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clear_len = 4 + 2 * curve->prime_len + 4 + curve->hash_len;
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clear = wpabuf_alloc(clear_len);
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attr_len = 4 + clear_len + AES_BLOCK_SIZE;
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#ifdef CONFIG_TESTING_OPTIONS
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if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_RESP)
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attr_len += 4;
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#endif /* CONFIG_TESTING_OPTIONS */
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msg = dpp_alloc_msg(DPP_PA_PKEX_COMMIT_REVEAL_RESP, attr_len);
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if (!clear || !msg)
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goto fail;
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/* A in Bootstrap Key attribute */
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wpabuf_put_le16(clear, DPP_ATTR_BOOTSTRAP_KEY);
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wpabuf_put_le16(clear, wpabuf_len(B_pub));
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wpabuf_put_buf(clear, B_pub);
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/* v in R-Auth tag attribute */
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wpabuf_put_le16(clear, DPP_ATTR_R_AUTH_TAG);
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wpabuf_put_le16(clear, curve->hash_len);
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wpabuf_put_data(clear, v, curve->hash_len);
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addr[0] = wpabuf_head_u8(msg) + 2;
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len[0] = DPP_HDR_LEN;
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octet = 1;
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addr[1] = &octet;
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len[1] = sizeof(octet);
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wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
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wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
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wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
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wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
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wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
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wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
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if (aes_siv_encrypt(pkex->z, curve->hash_len,
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wpabuf_head(clear), wpabuf_len(clear),
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2, addr, len, wrapped) < 0)
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goto fail;
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wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
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wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
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#ifdef CONFIG_TESTING_OPTIONS
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if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_RESP) {
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wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
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wpabuf_put_le16(msg, DPP_ATTR_TESTING);
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wpabuf_put_le16(msg, 0);
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}
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#endif /* CONFIG_TESTING_OPTIONS */
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out:
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wpabuf_free(clear);
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return msg;
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fail:
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wpabuf_free(msg);
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msg = NULL;
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goto out;
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}
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struct wpabuf * dpp_pkex_rx_commit_reveal_req(struct dpp_pkex *pkex,
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const u8 *hdr,
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const u8 *buf, size_t buflen)
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@ -6174,9 +6248,6 @@ struct wpabuf * dpp_pkex_rx_commit_reveal_req(struct dpp_pkex *pkex,
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struct wpabuf *msg = NULL, *A_pub = NULL, *X_pub = NULL, *Y_pub = NULL;
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struct wpabuf *B_pub = NULL;
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u8 u[DPP_MAX_HASH_LEN], v[DPP_MAX_HASH_LEN];
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size_t clear_len, attr_len;
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struct wpabuf *clear = NULL;
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u8 *wrapped;
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int res;
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/* K = y * X' */
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@ -6340,55 +6411,10 @@ struct wpabuf * dpp_pkex_rx_commit_reveal_req(struct dpp_pkex *pkex,
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goto fail;
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wpa_hexdump(MSG_DEBUG, "DPP: v", v, curve->hash_len);
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/* {B, v [bootstrapping info]}z */
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clear_len = 4 + 2 * curve->prime_len + 4 + curve->hash_len;
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clear = wpabuf_alloc(clear_len);
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attr_len = 4 + clear_len + AES_BLOCK_SIZE;
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#ifdef CONFIG_TESTING_OPTIONS
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if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_RESP)
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attr_len += 4;
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#endif /* CONFIG_TESTING_OPTIONS */
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msg = dpp_alloc_msg(DPP_PA_PKEX_COMMIT_REVEAL_RESP, attr_len);
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if (!clear || !msg)
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msg = dpp_pkex_build_commit_reveal_resp(pkex, B_pub, v);
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if (!msg)
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goto fail;
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/* A in Bootstrap Key attribute */
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wpabuf_put_le16(clear, DPP_ATTR_BOOTSTRAP_KEY);
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wpabuf_put_le16(clear, wpabuf_len(B_pub));
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wpabuf_put_buf(clear, B_pub);
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/* v in R-Auth tag attribute */
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wpabuf_put_le16(clear, DPP_ATTR_R_AUTH_TAG);
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wpabuf_put_le16(clear, curve->hash_len);
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wpabuf_put_data(clear, v, curve->hash_len);
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addr[0] = wpabuf_head_u8(msg) + 2;
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len[0] = DPP_HDR_LEN;
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octet = 1;
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addr[1] = &octet;
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len[1] = sizeof(octet);
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wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
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wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
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wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
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wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
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wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
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wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
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if (aes_siv_encrypt(pkex->z, curve->hash_len,
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wpabuf_head(clear), wpabuf_len(clear),
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2, addr, len, wrapped) < 0)
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goto fail;
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wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
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wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
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#ifdef CONFIG_TESTING_OPTIONS
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if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_RESP) {
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wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
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wpabuf_put_le16(msg, DPP_ATTR_TESTING);
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wpabuf_put_le16(msg, 0);
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}
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#endif /* CONFIG_TESTING_OPTIONS */
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out:
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EVP_PKEY_CTX_free(ctx);
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os_free(unwrapped);
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@ -6396,11 +6422,10 @@ out:
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wpabuf_free(B_pub);
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wpabuf_free(X_pub);
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wpabuf_free(Y_pub);
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wpabuf_free(clear);
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return msg;
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fail:
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wpabuf_free(msg);
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msg = NULL;
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wpa_printf(MSG_DEBUG,
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"DPP: PKEX Commit-Reveal Request processing failed");
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goto out;
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}
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