mirror of
https://github.com/guanzhi/GmSSL.git
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2336 lines
70 KiB
C
2336 lines
70 KiB
C
/*
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* Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*/
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#include <time.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef WIN32
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#include <winsock2.h>
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#else
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#include <unistd.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#endif
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#include <gmssl/rand.h>
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#include <gmssl/x509.h>
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#include <gmssl/error.h>
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#include <gmssl/sm2.h>
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#include <gmssl/sm3.h>
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#include <gmssl/sm4.h>
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#include <gmssl/pem.h>
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#include <gmssl/tls.h>
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#include <gmssl/digest.h>
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#include <gmssl/gcm.h>
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#include <gmssl/hmac.h>
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#include <gmssl/hkdf.h>
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#include <gmssl/mem.h>
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static const int tls13_ciphers[] = { TLS_cipher_sm4_gcm_sm3 };
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static size_t tls13_ciphers_count = sizeof(tls13_ciphers)/sizeof(int);
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/*
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int tls13_record_print(FILE *fp, const uint8_t *record, size_t recordlen, int format, int indent)
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{
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// 目前只支持TLCP的ECC公钥加密套件，因此不论用哪个套件解析都是一样的
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// 如果未来支持ECDHE套件，可以将函数改为宏，直接传入 (conn->cipher_suite << 8)
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format |= tls13_ciphers[0] << 8;
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return tls_record_print(fp, record, recordlen, format, indent);
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}
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*/
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static int tls13_client_hello_exts[] = {
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TLS_extension_supported_versions,
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TLS_extension_padding,
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};
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/*
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struct {
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opaque content[TLSPlaintext.length];
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ContentType type;
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uint8 zeros[length_of_padding];
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} TLSInnerPlaintext;
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struct {
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ContentType opaque_type = application_data; // 23
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ProtocolVersion legacy_record_version = 0x0303; // TLS v1.2
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uint16 length;
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opaque encrypted_record[TLSCiphertext.length];
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} TLSCiphertext;
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*/
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int tls13_gcm_encrypt(const BLOCK_CIPHER_KEY *key, const uint8_t iv[12],
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const uint8_t seq_num[8], int record_type,
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const uint8_t *in, size_t inlen, size_t padding_len, // TLSInnerPlaintext.content
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uint8_t *out, size_t *outlen) // TLSCiphertext.encrypted_record
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{
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uint8_t nonce[12];
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uint8_t aad[5];
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uint8_t *gmac;
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uint8_t *mbuf = NULL; // FIXME: update gcm_encrypt API
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size_t mlen, clen;
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if (!(mbuf = malloc(inlen + 256))) {
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error_print();
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return -1;
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}
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// nonce = (zeros|seq_num) xor (iv)
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nonce[0] = nonce[1] = nonce[2] = nonce[3] = 0;
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memcpy(nonce + 4, seq_num, 8);
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gmssl_memxor(nonce, nonce, iv, 12);
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// TLSInnerPlaintext
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memcpy(mbuf, in, inlen);
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mbuf[inlen] = record_type;
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memset(mbuf + inlen + 1, 0, padding_len);
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mlen = inlen + 1 + padding_len;
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clen = mlen + GHASH_SIZE;
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// aad = TLSCiphertext header
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aad[0] = TLS_record_application_data;
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aad[1] = 0x03; //TLS_protocol_tls12_major;
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aad[2] = 0x03; //TLS_protocol_tls12_minor;
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aad[3] = (uint8_t)(clen >> 8);
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aad[4] = (uint8_t)(clen);
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gmac = out + mlen;
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if (gcm_encrypt(key, nonce, sizeof(nonce), aad, sizeof(aad), mbuf, mlen, out, 16, gmac) != 1) {
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error_print();
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free(mbuf);
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return -1;
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}
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*outlen = clen;
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free(mbuf);
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return 1;
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}
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int tls13_gcm_decrypt(const BLOCK_CIPHER_KEY *key, const uint8_t iv[12],
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const uint8_t seq_num[8], const uint8_t *in, size_t inlen,
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int *record_type, uint8_t *out, size_t *outlen)
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{
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uint8_t nonce[12];
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uint8_t aad[5];
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size_t mlen;
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const uint8_t *gmac;
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// nonce = (zeros|seq_num) xor (iv)
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nonce[0] = nonce[1] = nonce[2] = nonce[3] = 0;
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memcpy(nonce + 4, seq_num, 8);
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gmssl_memxor(nonce, nonce, iv, 12);
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// aad = TLSCiphertext header
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aad[0] = TLS_record_application_data;
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aad[1] = 0x03; //TLS_protocol_tls12_major;
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aad[2] = 0x03; //TLS_protocol_tls12_minor;
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aad[3] = (uint8_t)(inlen >> 8);
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aad[4] = (uint8_t)(inlen);
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if (inlen < GHASH_SIZE) {
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error_print();
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return -1;
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}
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mlen = inlen - GHASH_SIZE;
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gmac = in + mlen;
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if (gcm_decrypt(key, nonce, 12, aad, 5, in, mlen, gmac, GHASH_SIZE, out) != 1) {
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error_print();
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return -1;
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}
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// remove padding, get record_type
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*record_type = 0;
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while (mlen--) {
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if (out[mlen] != 0) {
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*record_type = out[mlen];
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break;
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}
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}
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*outlen = mlen;
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if (!tls_record_type_name(*record_type)) {
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error_print();
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return -1;
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}
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return 1;
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}
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// 这个函数是不对的，在我们的一些情况下，加密的时候并不会组成完整的数据
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int tls13_record_encrypt(const BLOCK_CIPHER_KEY *key, const uint8_t iv[12],
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const uint8_t seq_num[8], const uint8_t *record, size_t recordlen, size_t padding_len,
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uint8_t *enced_record, size_t *enced_recordlen)
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{
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// 被加密的是握手消息或者是应用层数据
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if (tls13_gcm_encrypt(key, iv,
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seq_num, record[0], record + 5, recordlen - 5, padding_len,
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enced_record + 5, enced_recordlen) != 1) {
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error_print();
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return -1;
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}
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enced_record[0] = TLS_record_application_data; // 显然这个不太对啊
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enced_record[1] = 0x03; //TLS_protocol_tls12_major;
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enced_record[2] = 0x03; //TLS_protocol_tls12_minor;
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enced_record[3] = (uint8_t)((*enced_recordlen) >> 8);
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enced_record[4] = (uint8_t)(*enced_recordlen);
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(*enced_recordlen) += 5;
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return 1;
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}
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int tls13_record_decrypt(const BLOCK_CIPHER_KEY *key, const uint8_t iv[12],
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const uint8_t seq_num[8], const uint8_t *enced_record, size_t enced_recordlen,
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uint8_t *record, size_t *recordlen)
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{
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int record_type;
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if (tls13_gcm_decrypt(key, iv,
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seq_num, enced_record + 5, enced_recordlen - 5,
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&record_type, record + 5, recordlen) != 1) {
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error_print();
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return -1;
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}
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record[0] = record_type;
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record[1] = 0x03; //TLS_protocol_tls12_major;
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record[2] = 0x03; //TLS_protocol_tls12_minor;
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record[3] = (uint8_t)((*recordlen) >> 8);
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record[4] = (uint8_t)(*recordlen);
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(*recordlen) += 5;
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return 1;
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}
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int tls13_send(TLS_CONNECT *conn, const uint8_t *data, size_t datalen, size_t *sentlen)
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{
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const BLOCK_CIPHER_KEY *key;
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const uint8_t *iv;
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uint8_t *seq_num;
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uint8_t *record = conn->record;
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size_t recordlen;
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size_t padding_len = 0; //FIXME: 在conn中设置是否加随机填充，及设置该值
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tls_trace("send {ApplicationData}\n");
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if (conn->is_client) {
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key = &conn->client_write_key;
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iv = conn->client_write_iv;
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seq_num = conn->client_seq_num;
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} else {
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key = &conn->server_write_key;
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iv = conn->server_write_iv;
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seq_num = conn->server_seq_num;
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}
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if (tls13_gcm_encrypt(key, iv,
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seq_num, TLS_record_application_data, data, datalen, padding_len,
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record + 5, &recordlen) != 1) {
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error_print();
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return -1;
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}
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record[0] = TLS_record_application_data;
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record[1] = TLS_protocol_tls12 >> 8;
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record[2] = TLS_protocol_tls12 & 0xff;
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record[3] = (uint8_t)(recordlen >> 8);
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record[4] = (uint8_t)(recordlen);
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recordlen += 5;
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tls_record_send(record, recordlen, conn->sock);
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tls_record_trace(stderr, record, tls_record_length(record), 0, 0);
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tls_seq_num_incr(seq_num);
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*sentlen = datalen;
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return 1;
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}
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/*
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int tls13_recv(TLS_CONNECT *conn, uint8_t *data, size_t *datalen)
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{
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int record_type;
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uint8_t *record = conn->record;
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size_t recordlen;
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const BLOCK_CIPHER_KEY *key;
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const uint8_t *iv;
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uint8_t *seq_num;
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tls_trace("recv {ApplicationData}\n");
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if (conn->is_client) {
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key = &conn->server_write_key;
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iv = conn->server_write_iv;
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seq_num = conn->server_seq_num;
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} else {
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key = &conn->client_write_key;
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iv = conn->client_write_iv;
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seq_num = conn->client_seq_num;
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}
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if (tls_record_recv(record, &recordlen, conn->sock) != 1) {
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error_print();
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return -1;
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}
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if (record[0] != TLS_record_application_data) {
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error_print();
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return -1;
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}
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if (tls13_gcm_decrypt(key, iv,
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seq_num, record + 5, recordlen - 5,
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&record_type, data, datalen) != 1) {
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error_print();
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return -1;
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}
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tls_record_trace(stderr, record, tls_record_length(record), 0, 0);
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tls_seq_num_incr(seq_num);
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if (record_type != TLS_record_application_data) {
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error_print();
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return -1;
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}
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return 1;
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}
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*/
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int tls13_do_recv(TLS_CONNECT *conn)
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{
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int ret;
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const BLOCK_CIPHER_KEY *key;
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const uint8_t *iv;
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uint8_t *seq_num;
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uint8_t *record = conn->record;
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size_t recordlen;
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int record_type;
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if (conn->is_client) {
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key = &conn->server_write_key;
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iv = conn->server_write_iv;
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seq_num = conn->server_seq_num;
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} else {
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key = &conn->client_write_key;
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iv = conn->client_write_iv;
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seq_num = conn->client_seq_num;
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}
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tls_trace("recv ApplicationData\n");
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if ((ret = tls_record_recv(record, &recordlen, conn->sock)) != 1) {
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if (ret < 0) error_print();
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return ret;
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}
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tls_record_trace(stderr, record, recordlen, 0, 0);
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// TODO: 是否需要检查record_type? record[0] != TLS_record_application_data
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if (tls13_gcm_decrypt(key, iv,
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seq_num, record + 5, recordlen - 5,
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&record_type, conn->databuf, &conn->datalen) != 1) {
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error_print();
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return -1;
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}
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conn->data = conn->databuf;
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tls_seq_num_incr(seq_num);
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tls_record_set_data(record, conn->data, conn->datalen);
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tls_trace("decrypt ApplicationData\n");
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tls_record_trace(stderr, record, tls_record_length(record), 0, 0);
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if (record_type != TLS_record_application_data) {
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error_print();
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return -1;
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}
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return 1;
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}
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int tls13_recv(TLS_CONNECT *conn, uint8_t *out, size_t outlen, size_t *recvlen)
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{
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if (!conn || !out || !outlen || !recvlen) {
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error_print();
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return -1;
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}
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if (conn->datalen == 0) {
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int ret;
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if ((ret = tls13_do_recv(conn)) != 1) {
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if (ret) error_print();
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return ret;
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}
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}
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*recvlen = outlen <= conn->datalen ? outlen : conn->datalen;
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memcpy(out, conn->data, *recvlen);
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conn->data += *recvlen;
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conn->datalen -= *recvlen;
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return 1;
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}
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/*
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HKDF-Expand-Label(Secret, Label, Context, Length) =
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HKDF-Expand(Secret, HkdfLabel, Length);
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HkdfLabel = struct {
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uint16 length = Length;
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opaque label<7..255> = "tls13 " + Label;
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opaque context<0..255> = Context; }
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Derive-Secret(Secret, Label, Messages) =
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HKDF-Expand-Label(Secret, Label, Hash(Messages), Hash.length)
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*/
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int tls13_hkdf_extract(const DIGEST *digest, const uint8_t salt[32], const uint8_t in[32], uint8_t out[32])
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{
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size_t dgstlen;
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if (hkdf_extract(digest, salt, 32, in, 32, out, &dgstlen) != 1
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|| dgstlen != 32) {
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error_print();
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return -1;
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}
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return 1;
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}
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int tls13_hkdf_expand_label(const DIGEST *digest, const uint8_t secret[32],
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const char *label, const uint8_t *context, size_t context_len,
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size_t outlen, uint8_t *out)
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{
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uint8_t label_len;
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uint8_t hkdf_label[2 + 256 + 256];
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uint8_t *p = hkdf_label;
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size_t hkdf_label_len = 0;
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label_len = (uint8_t)(strlen("tls13 ") + strlen(label)); //FIXME: check length < 255
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tls_uint16_to_bytes((uint16_t)outlen, &p, &hkdf_label_len);
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tls_uint8_to_bytes(label_len, &p, &hkdf_label_len);
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tls_array_to_bytes((uint8_t *)"tls13 ", strlen("tls13 "), &p, &hkdf_label_len);
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tls_array_to_bytes((uint8_t *)label, strlen(label), &p, &hkdf_label_len);
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tls_uint8array_to_bytes(context, context_len, &p, &hkdf_label_len);
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hkdf_expand(digest, secret, 32, hkdf_label, hkdf_label_len, outlen, out);
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return 1;
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}
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int tls13_derive_secret(const uint8_t secret[32], const char *label, const DIGEST_CTX *dgst_ctx, uint8_t out[32])
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{
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DIGEST_CTX ctx = *dgst_ctx;
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uint8_t dgst[64];
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size_t dgstlen;
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if (digest_finish(&ctx, dgst, &dgstlen) != 1
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|| tls13_hkdf_expand_label(dgst_ctx->digest, secret, label, dgst, 32, dgstlen, out) != 1) {
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error_print();
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return -1;
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}
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return 1;
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}
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static const uint8_t TLS13_client_context_str_and_zero[] = "TLS 1.3, client CertificateVerify";
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static const uint8_t TLS13_server_context_str_and_zero[] = "TLS 1.3, server CertificateVerify";
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static size_t TLS13_client_context_str_and_zero_size = sizeof(TLS13_client_context_str_and_zero);
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static size_t TLS13_server_context_str_and_zero_size = sizeof(TLS13_server_context_str_and_zero);
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int tls13_sign_certificate_verify(int tls_mode,
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const SM2_KEY *key, const char *signer_id, size_t signer_id_len,
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const DIGEST_CTX *tbs_dgst_ctx,
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uint8_t *sig, size_t *siglen)
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{
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SM2_SIGN_CTX sign_ctx;
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uint8_t prefix[64];
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const uint8_t *context_str_and_zero;
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size_t context_str_and_zero_len;
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DIGEST_CTX dgst_ctx;
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uint8_t dgst[64];
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size_t dgstlen;
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memset(prefix, 0x20, 64);
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switch (tls_mode) {
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case TLS_client_mode:
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context_str_and_zero = TLS13_client_context_str_and_zero;
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context_str_and_zero_len = TLS13_client_context_str_and_zero_size;
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break;
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case TLS_server_mode:
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context_str_and_zero = TLS13_server_context_str_and_zero;
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context_str_and_zero_len = TLS13_server_context_str_and_zero_size;
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break;
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default:
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
dgst_ctx = *tbs_dgst_ctx;
|
||
digest_finish(&dgst_ctx, dgst, &dgstlen);
|
||
|
||
sm2_sign_init(&sign_ctx, key, signer_id, signer_id_len);
|
||
sm2_sign_update(&sign_ctx, prefix, 64);
|
||
sm2_sign_update(&sign_ctx, context_str_and_zero, context_str_and_zero_len);
|
||
sm2_sign_update(&sign_ctx, dgst, dgstlen);
|
||
sm2_sign_finish(&sign_ctx, sig, siglen);
|
||
|
||
gmssl_secure_clear(&sign_ctx, sizeof(sign_ctx));
|
||
return 1;
|
||
}
|
||
|
||
int tls13_verify_certificate_verify(int tls_mode,
|
||
const SM2_KEY *public_key, const char *signer_id, size_t signer_id_len,
|
||
const DIGEST_CTX *tbs_dgst_ctx, const uint8_t *sig, size_t siglen)
|
||
{
|
||
int ret;
|
||
SM2_SIGN_CTX verify_ctx;
|
||
uint8_t prefix[64];
|
||
const uint8_t *context_str_and_zero;
|
||
size_t context_str_and_zero_len;
|
||
DIGEST_CTX dgst_ctx;
|
||
uint8_t dgst[64];
|
||
size_t dgstlen;
|
||
|
||
memset(prefix, 0x20, 64);
|
||
|
||
switch (tls_mode) {
|
||
case TLS_client_mode:
|
||
context_str_and_zero = TLS13_client_context_str_and_zero;
|
||
context_str_and_zero_len = TLS13_client_context_str_and_zero_size;
|
||
break;
|
||
case TLS_server_mode:
|
||
context_str_and_zero = TLS13_server_context_str_and_zero;
|
||
context_str_and_zero_len = TLS13_server_context_str_and_zero_size;
|
||
break;
|
||
default:
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
dgst_ctx = *tbs_dgst_ctx;
|
||
digest_finish(&dgst_ctx, dgst, &dgstlen);
|
||
|
||
sm2_verify_init(&verify_ctx, public_key, signer_id, signer_id_len);
|
||
sm2_verify_update(&verify_ctx, prefix, 64);
|
||
sm2_verify_update(&verify_ctx, context_str_and_zero, context_str_and_zero_len);
|
||
sm2_verify_update(&verify_ctx, dgst, dgstlen);
|
||
|
||
if ((ret = sm2_verify_finish(&verify_ctx, sig, siglen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret != 1) {
|
||
error_print();
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
/*
|
||
verify_data in Finished
|
||
|
||
finished_key =
|
||
HKDF-Expand-Label(BaseKey, "finished", "", Hash.length)
|
||
Structure of this message:
|
||
struct {
|
||
opaque verify_data[Hash.length];
|
||
} Finished;
|
||
The verify_data value is computed as follows:
|
||
verify_data =
|
||
HMAC(finished_key,
|
||
Transcript-Hash(Handshake Context,
|
||
Certificate*, CertificateVerify*))
|
||
*/
|
||
|
||
int tls13_compute_verify_data(const uint8_t *handshake_traffic_secret,
|
||
const DIGEST_CTX *dgst_ctx, uint8_t *verify_data, size_t *verify_data_len)
|
||
{
|
||
DIGEST_CTX temp_dgst_ctx;
|
||
uint8_t dgst[64];
|
||
size_t dgstlen;
|
||
uint8_t finished_key[64];
|
||
size_t finished_key_len;
|
||
|
||
temp_dgst_ctx = *dgst_ctx;
|
||
digest_finish(&temp_dgst_ctx, dgst, &dgstlen);
|
||
finished_key_len = dgstlen;
|
||
|
||
tls13_hkdf_expand_label(dgst_ctx->digest, handshake_traffic_secret,
|
||
"finished", NULL, 0, finished_key_len, finished_key);
|
||
|
||
hmac(dgst_ctx->digest, finished_key, finished_key_len, dgst, dgstlen, verify_data, verify_data_len);
|
||
return 1;
|
||
}
|
||
|
||
/*
|
||
Handshakes
|
||
|
||
*/
|
||
|
||
int tls13_client_hello_exts_set(uint8_t *exts, size_t *extslen, size_t maxlen,
|
||
const SM2_POINT *client_ecdhe_public)
|
||
{
|
||
int protocols[] = { TLS_protocol_tls13 };
|
||
int supported_groups[] = { TLS_curve_sm2p256v1 };
|
||
int sig_algs[] = { TLS_sig_sm2sig_sm3 };
|
||
size_t protocols_cnt = sizeof(protocols)/sizeof(int);
|
||
size_t supported_groups_cnt = sizeof(supported_groups)/sizeof(int);
|
||
size_t sig_algs_cnt = sizeof(sig_algs)/sizeof(int);
|
||
|
||
|
||
if (!exts || !extslen || !client_ecdhe_public) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
*extslen = 0;
|
||
if (tls13_supported_versions_ext_to_bytes(TLS_client_mode, protocols, protocols_cnt, NULL, extslen) != 1
|
||
|| tls_supported_groups_ext_to_bytes(supported_groups, supported_groups_cnt, NULL, extslen) != 1
|
||
|| tls_signature_algorithms_ext_to_bytes(sig_algs, sig_algs_cnt, NULL, extslen) != 1
|
||
|| tls13_client_key_share_ext_to_bytes(client_ecdhe_public, NULL, extslen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (*extslen > maxlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*extslen = 0;
|
||
tls13_supported_versions_ext_to_bytes(TLS_client_mode, protocols, protocols_cnt, &exts, extslen);
|
||
tls_supported_groups_ext_to_bytes(supported_groups, supported_groups_cnt, &exts, extslen);
|
||
tls_signature_algorithms_ext_to_bytes(sig_algs, sig_algs_cnt, &exts, extslen);
|
||
tls13_client_key_share_ext_to_bytes(client_ecdhe_public, &exts, extslen);
|
||
return 1;
|
||
}
|
||
|
||
int tls13_process_client_hello_exts(const uint8_t *exts, size_t extslen,
|
||
const SM2_KEY *server_ecdhe_key, SM2_POINT *client_ecdhe_public,
|
||
uint8_t *server_exts, size_t *server_exts_len, size_t server_exts_maxlen)
|
||
{
|
||
size_t len = 0;
|
||
*server_exts_len = 0;
|
||
|
||
while (extslen) {
|
||
uint16_t ext_type;
|
||
const uint8_t *ext_data;
|
||
size_t ext_datalen;
|
||
|
||
if (tls_uint16_from_bytes(&ext_type, &exts, &extslen) != 1
|
||
|| tls_uint16array_from_bytes(&ext_data, &ext_datalen, &exts, &extslen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
switch (ext_type) {
|
||
/*
|
||
// tls13_process_client_hello_exts 的接口需要处理，部分输出要输出到server_exts中
|
||
case TLS_extension_supported_groups: // 这个应该放在EE里面
|
||
if (tls_process_client_supported_groups(ext_data, ext_datalen, NULL, &len) != 1
|
||
|| len > server_exts_maxlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
tls_process_client_supported_groups(ext_data, ext_datalen, &server_exts, server_exts_len);
|
||
break;
|
||
case TLS_extension_signature_algorithms: // client单方面通知就可以了，服务器不需要响应
|
||
if (tls_process_client_signature_algorithms(ext_data, ext_datalen, NULL, &len) != 1
|
||
|| len > server_exts_maxlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
tls_process_client_signature_algorithms(ext_data, ext_datalen, &server_exts, server_exts_len);
|
||
break;
|
||
*/
|
||
case TLS_extension_supported_versions:
|
||
if (tls13_process_client_supported_versions(ext_data, ext_datalen, NULL, &len) != 1
|
||
|| len > server_exts_maxlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
tls13_process_client_supported_versions(ext_data, ext_datalen, &server_exts, server_exts_len);
|
||
break;
|
||
case TLS_extension_key_share:
|
||
if (tls13_process_client_key_share(ext_data, ext_datalen, server_ecdhe_key, client_ecdhe_public, &server_exts, server_exts_len) != 1
|
||
|| len > server_exts_maxlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
; // server ignore unkonwn extensions
|
||
}
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
int tls_client_key_shares_from_bytes(SM2_POINT *sm2_point, const uint8_t **in, size_t *inlen)
|
||
{
|
||
const uint8_t *key_shares;
|
||
size_t key_shares_len;
|
||
|
||
tls_uint16array_from_bytes(&key_shares, &key_shares_len, in, inlen);
|
||
|
||
while (key_shares_len) {
|
||
uint16_t group;
|
||
const uint8_t *key_exch;
|
||
size_t key_exch_len;
|
||
|
||
tls_uint16_from_bytes(&group, &key_shares, &key_shares_len);
|
||
tls_uint16array_from_bytes(&key_exch, &key_exch_len, &key_shares, &key_shares_len);
|
||
|
||
if (key_exch_len != 65) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
switch (group) {
|
||
case TLS_curve_sm2p256v1:
|
||
sm2_point_from_octets(sm2_point, key_exch, key_exch_len);
|
||
break;
|
||
default:
|
||
error_print();
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
// 这个函数不是太正确，应该也是一个process
|
||
int tls13_server_hello_extensions_get(const uint8_t *exts, size_t extslen, SM2_POINT *sm2_point)
|
||
{
|
||
uint16_t version;
|
||
while (extslen) {
|
||
uint16_t ext_type;
|
||
const uint8_t *ext_data;
|
||
size_t ext_datalen;
|
||
|
||
tls_uint16_from_bytes(&ext_type, &exts, &extslen);
|
||
tls_uint16array_from_bytes(&ext_data, &ext_datalen, &exts, &extslen);
|
||
|
||
switch (ext_type) {
|
||
case TLS_extension_supported_versions:
|
||
if (tls_uint16_from_bytes(&version, &ext_data, &ext_datalen) != 1
|
||
|| ext_datalen > 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (version != TLS_protocol_tls13) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
break;
|
||
case TLS_extension_key_share:
|
||
if (tls13_process_server_key_share(ext_data, ext_datalen, sm2_point) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
break;
|
||
//default:
|
||
// FIXME: 还有几个扩展没有处理！
|
||
//error_print();
|
||
//return -1;
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
|
||
/*
|
||
struct {
|
||
Extension extensions<0..2^16-1>;
|
||
} EncryptedExtensions;
|
||
*/
|
||
static int tls13_encrypted_exts[] = {
|
||
TLS_extension_server_name,
|
||
TLS_extension_max_fragment_length,
|
||
TLS_extension_supported_groups,
|
||
TLS_extension_use_srtp,
|
||
TLS_extension_heartbeat,
|
||
TLS_extension_application_layer_protocol_negotiation,
|
||
TLS_extension_client_certificate_type,
|
||
TLS_extension_server_certificate_type,
|
||
TLS_extension_early_data,
|
||
};
|
||
|
||
int tls13_encrypted_extensions_print(FILE *fp, int fmt, int ind, const uint8_t *data, size_t datalen)
|
||
{
|
||
const uint8_t *exts;
|
||
size_t extslen;
|
||
|
||
format_print(fp, fmt, ind, "EncryptedExtensions\n");
|
||
ind += 4;
|
||
|
||
if (tls_uint16array_from_bytes(&exts, &extslen, &data, &datalen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (exts) {
|
||
tls13_extensions_print(fp, fmt, ind, TLS_handshake_encrypted_extensions, exts, extslen);
|
||
}
|
||
if (tls_length_is_zero(datalen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
int tls13_record_set_handshake_encrypted_extensions(uint8_t *record, size_t *recordlen)
|
||
{
|
||
int type = TLS_handshake_encrypted_extensions;
|
||
uint8_t *p = record + 5 + 4;
|
||
size_t len = 0;
|
||
uint8_t exts[128];
|
||
size_t extslen = 0;
|
||
uint8_t *pexts = exts;
|
||
const int supported_groups[] = { TLS_curve_sm2p256v1 };
|
||
|
||
tls_supported_groups_ext_to_bytes(supported_groups, sizeof(supported_groups)/sizeof(int), &pexts, &extslen);
|
||
|
||
tls_uint16array_to_bytes(exts, extslen, &p, &len);
|
||
tls_record_set_handshake(record, recordlen, type, NULL, len);
|
||
|
||
return 1;
|
||
}
|
||
|
||
int tls13_record_get_handshake_encrypted_extensions(const uint8_t *record)
|
||
{
|
||
int type;
|
||
const uint8_t *p;
|
||
size_t len;
|
||
const uint8_t *exts_data;
|
||
size_t exts_datalen;
|
||
|
||
if (tls_record_get_handshake(record, &type, &p, &len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (tls_uint16array_from_bytes(&exts_data, &exts_datalen, &p, &len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
// 当前实现不需要在EncryptedExtensions提供扩展
|
||
if (exts_datalen) {
|
||
// FIXME: 实际上supported_groups是放在这里的，应该加以处理
|
||
//error_print();
|
||
//return -1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
|
||
/*
|
||
ClientHello.Extensions.signature_algorithms 列出客户端支持的签名+哈希算法
|
||
ServerHello.Extensions.supported_groups 决定了服务器的公钥类型，
|
||
因此也决定了服务器的签名算法
|
||
ServerHello.cipher_suite决定了哈希函数
|
||
*/
|
||
|
||
/*
|
||
struct {
|
||
SignatureScheme algorithm;
|
||
opaque signature<0..2^16-1>;
|
||
} CertificateVerify;
|
||
|
||
注意：TLS 1.2中只有RAW signature, 也就是没有经过uint16array封装的，这其实不太符合TLS的设计逻辑
|
||
*/
|
||
int tls13_record_set_handshake_certificate_verify(uint8_t *record, size_t *recordlen,
|
||
int sign_algor, const uint8_t *sig, size_t siglen)
|
||
{
|
||
int type = TLS_handshake_certificate_verify;
|
||
uint8_t *p = record + 5 + 4;
|
||
size_t len = 0;
|
||
|
||
tls_uint16_to_bytes((uint16_t)sign_algor, &p, &len);
|
||
tls_uint16array_to_bytes(sig, siglen, &p, &len);
|
||
|
||
if (tls_record_set_handshake(record, recordlen, type, NULL, len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
int tls13_record_get_handshake_certificate_verify(const uint8_t *record,
|
||
int *sign_algor, const uint8_t **sig, size_t *siglen)
|
||
{
|
||
int type;
|
||
const uint8_t *p;
|
||
size_t len ;
|
||
|
||
if (tls_record_get_handshake(record, &type, &p, &len) != 1
|
||
|| type != TLS_handshake_certificate_verify) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
*sign_algor = 0;
|
||
tls_uint16_from_bytes((uint16_t *)sign_algor, &p, &len);
|
||
tls_uint16array_from_bytes(sig, siglen, &p, &len);
|
||
|
||
return 1;
|
||
}
|
||
|
||
|
||
/*
|
||
struct {
|
||
opaque certificate_request_context<0..2^8-1>;
|
||
Extension extensions<2..2^16-1>;
|
||
} CertificateRequest;
|
||
|
||
certificate_request_context 用于 Post-handshake Authentication，否则应该长度为0
|
||
|
||
*/
|
||
static int tls13_certificate_request_exts[] = {
|
||
TLS_extension_signature_algorithms, // 必须包含
|
||
TLS_extension_status_request,
|
||
TLS_extension_signed_certificate_timestamp,
|
||
TLS_extension_certificate_authorities,
|
||
TLS_extension_oid_filters,
|
||
TLS_extension_signature_algorithms_cert,
|
||
};
|
||
|
||
|
||
|
||
|
||
/*
|
||
struct {
|
||
opaque certificate_request_context<0..2^8-1>;
|
||
Extension extensions<2..2^16-1>;
|
||
} CertificateRequest;
|
||
|
||
extensiosns:
|
||
Extension signature_algorithms MUST be specified
|
||
*/
|
||
int tls13_record_set_handshake_certificate_request(uint8_t *record, size_t *recordlen,
|
||
const uint8_t *request_context, size_t request_context_len,
|
||
const uint8_t *exts, size_t extslen)
|
||
{
|
||
int type = TLS_handshake_certificate_request;
|
||
uint8_t *data;
|
||
size_t datalen = 0;
|
||
|
||
if (!record || !recordlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
data = tls_handshake_data(tls_record_data(record));
|
||
tls_uint8array_to_bytes(request_context, request_context_len, &data, &datalen);
|
||
tls_uint16array_to_bytes(exts, extslen, &data, &datalen);
|
||
tls_record_set_handshake(record, recordlen, type, NULL, datalen);
|
||
return 1;
|
||
}
|
||
|
||
int tls13_record_set_handshake_certificate_request_default(uint8_t *record, size_t *recordlen)
|
||
{
|
||
int sig_algs[] = { TLS_sig_sm2sig_sm3 };
|
||
uint8_t exts[256];
|
||
uint8_t *p = exts;
|
||
size_t extslen = 0;
|
||
|
||
tls_signature_algorithms_ext_to_bytes(sig_algs, sizeof(sig_algs)/sizeof(int), &p, &extslen);
|
||
tls13_record_set_handshake_certificate_request(record, recordlen, NULL, 0, exts, extslen);
|
||
return 1;
|
||
}
|
||
|
||
int tls13_record_get_handshake_certificate_request(const uint8_t *record,
|
||
const uint8_t **requst_context, size_t *request_context_len,
|
||
const uint8_t **exts, size_t *exts_len)
|
||
{
|
||
int type;
|
||
const uint8_t *p;
|
||
size_t len;
|
||
|
||
if (tls_record_get_handshake(record, &type, &p, &len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (type != TLS_handshake_certificate_request) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (tls_uint8array_from_bytes(requst_context, request_context_len, &p, &len) != 1
|
||
|| tls_uint16array_from_bytes(exts, exts_len, &p, &len) != 1
|
||
|| tls_length_is_zero(len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static const int tls13_handshake_certificate_exts[] = {
|
||
TLS_extension_status_request,
|
||
TLS_extension_signed_certificate_timestamp,
|
||
};
|
||
/*
|
||
enum { X509(0), RawPublicKey(2), (255) } CertificateType;
|
||
|
||
struct {
|
||
select (certificate_type) {
|
||
case RawPublicKey: opaque ASN1_subjectPublicKeyInfo<1..2^24-1>; -- TLS 1.3可以只传公钥不传证书
|
||
case X509: opaque cert_data<1..2^24-1>;
|
||
};
|
||
Extension extensions<0..2^16-1>;
|
||
} CertificateEntry;
|
||
|
||
struct {
|
||
opaque certificate_request_context<0..2^8-1>; -- 用于客户端证书，服务器证书该域长度为0
|
||
CertificateEntry certificate_list<0..2^24-1>;
|
||
} Certificate;
|
||
|
||
TLS 1.3 Certificate：
|
||
|
||
* TLS 1.3 支持发送公钥，可以去掉嵌入式环境的证书传输开销
|
||
* TLS 1.3 的证书链中增加了 certificate_request_context
|
||
用于客户端发送证书时标识context，服务器端的证书中该域的长度为0
|
||
* 证书链中每个证书都有一个独立的扩展域，TLS 1.2 中的证书相关扩展移至此处
|
||
|
||
Extensions in client Certificate MUST from ClientHello
|
||
Extensions in server Certificate MUST from CertificateRequest
|
||
Entensions apply to entire chain SHOULD be in the first CertificateEntry
|
||
|
||
目前CertificateEntry中的扩展主要用于服务器证书的验证
|
||
客户端在ClientHello中可以包含status_request 和 signed_certificate_timestamp
|
||
让服务器提供 OCSP 的状态证明和时间戳信息
|
||
服务器则在证书消息的每个证书否面附带这两个扩展，提供相关信息
|
||
|
||
在 RFC 8446 (TLS 1.3) 中还没有涉及客户端证书的具体扩展
|
||
但是客户端在提供客户端证书时，应该响应服务器CertificateRequest消息中的扩展
|
||
|
||
目前GmSSLv3还不支持这两个证书扩展的生成，但是提供解析和显示
|
||
|
||
Valid extensions for server certificates:
|
||
TLS_extension_status_request (5)
|
||
TLS_extension_signed_certificate_timestamp (18)
|
||
*/
|
||
|
||
int tls13_certificate_print(FILE *fp, int fmt, int ind, const uint8_t *cert, size_t certlen)
|
||
{
|
||
const uint8_t *p;
|
||
size_t len;
|
||
|
||
format_print(fp, fmt, ind, "Certificate\n");
|
||
ind += 4;
|
||
|
||
if (tls_uint8array_from_bytes(&p, &len, &cert, &certlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
format_bytes(fp, fmt, ind, "certificate_request_context", p, len);
|
||
|
||
format_print(fp, fmt, ind, "certificate_list\n");
|
||
ind += 4;
|
||
if (tls_uint24array_from_bytes(&p, &len, &cert, &certlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
while (len) {
|
||
const uint8_t *cert_data;
|
||
size_t cert_data_len;
|
||
const uint8_t *exts;
|
||
size_t extslen;
|
||
|
||
if (tls_uint24array_from_bytes(&cert_data, &cert_data_len, &p, &len) != 1
|
||
|| tls_uint16array_from_bytes(&exts, &extslen, &p, &len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (!cert_data) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
format_print(fp, fmt, ind, "CertificateEntry\n");
|
||
x509_cert_print(fp, fmt, ind + 4, "Certificate", cert_data, cert_data_len);
|
||
x509_cert_to_pem(cert_data, cert_data_len, fp);
|
||
tls13_extensions_print(fp, fmt, ind + 4, TLS_handshake_certificate, exts, extslen);
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
int tls13_certificate_request_print(FILE *fp, int fmt, int ind, const uint8_t *certreq, size_t certreqlen)
|
||
{
|
||
const uint8_t *p;
|
||
size_t len;
|
||
|
||
format_print(fp, fmt, ind, "CertificateRequest\n");
|
||
ind += 4;
|
||
|
||
if (tls_uint8array_from_bytes(&p, &len, &certreq, &certreqlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
format_bytes(fp, fmt, ind, "certificate_request_context", p, len);
|
||
|
||
if (tls_uint16array_from_bytes(&p, &len, &certreq, &certreqlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
format_bytes(fp, fmt, ind, "extensions", p, len);
|
||
|
||
if (tls_length_is_zero(certreqlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
int tls13_certificate_verify_print(FILE *fp, int fmt, int ind, const uint8_t *d, size_t dlen)
|
||
{
|
||
uint16_t sig_alg;
|
||
const uint8_t *sig;
|
||
size_t siglen;
|
||
|
||
format_print(fp, fmt, ind, "CertificateVerify\n");
|
||
ind += 4;
|
||
|
||
if (tls_uint16_from_bytes(&sig_alg, &d, &dlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
format_print(fp, fmt, ind, "algorithm: %s (0x%04x)\n", tls_signature_scheme_name(sig_alg), sig_alg);
|
||
if (tls_uint16array_from_bytes(&sig, &siglen, &d, &dlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
format_bytes(fp, fmt, ind, "signature", sig, siglen);
|
||
if (tls_length_is_zero(dlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
int tls13_certificate_list_to_bytes(const uint8_t *certs, size_t certslen,
|
||
uint8_t **out, size_t *outlen)
|
||
{
|
||
uint8_t *p = NULL;
|
||
size_t cert_list_len = 0;
|
||
|
||
if (out && *out) {
|
||
p = (*out) + tls_uint24_size();
|
||
}
|
||
while (certslen) {
|
||
const uint8_t *cert;
|
||
size_t certlen;
|
||
const uint8_t *entry_exts = NULL;
|
||
size_t entry_exts_len = 0;
|
||
|
||
if (x509_cert_from_der(&cert, &certlen, &certs, &certslen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
tls_uint24array_to_bytes(cert, certlen, &p, &cert_list_len);
|
||
tls_uint16array_to_bytes(entry_exts, entry_exts_len, &p, &cert_list_len);
|
||
|
||
}
|
||
tls_uint24array_to_bytes(NULL, cert_list_len, out, outlen);
|
||
return 1;
|
||
}
|
||
|
||
int tls13_process_certificate_list(const uint8_t *cert_list, size_t cert_list_len,
|
||
uint8_t *certs, size_t *certs_len)
|
||
{
|
||
*certs_len = 0;
|
||
|
||
while (cert_list_len) {
|
||
const uint8_t *cert_data;
|
||
size_t cert_data_len;
|
||
const uint8_t *exts;
|
||
size_t exts_len;
|
||
const uint8_t *cert;
|
||
size_t cert_len;
|
||
|
||
if (tls_uint24array_from_bytes(&cert_data, &cert_data_len, &cert_list, &cert_list_len) != 1
|
||
|| tls_uint16array_from_bytes(&exts, &exts_len, &cert_list, &cert_list_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (x509_cert_from_der(&cert, &cert_len, &cert_data, &cert_data_len) != 1
|
||
|| asn1_length_is_zero(cert_data_len) != 1
|
||
|| x509_cert_to_der(cert, cert_len, &certs, certs_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
while (exts_len) {
|
||
int ext_type;
|
||
const uint8_t *ext_data;
|
||
size_t ext_data_len;
|
||
|
||
if (tls_ext_from_bytes(&ext_type, &ext_data, &ext_data_len, &exts, &exts_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
switch (ext_type) {
|
||
case TLS_extension_status_request:
|
||
case TLS_extension_signed_certificate_timestamp:
|
||
error_print();
|
||
return -1;
|
||
default:
|
||
error_print();
|
||
return -1;
|
||
}
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
int tls13_record_set_handshake_certificate(uint8_t *record, size_t *recordlen,
|
||
const uint8_t *request_context, size_t request_context_len,
|
||
const uint8_t *certs, size_t certslen)
|
||
{
|
||
int type = TLS_handshake_certificate;
|
||
uint8_t *data;
|
||
size_t datalen;
|
||
|
||
if (!record || !recordlen || !certs || !certslen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
datalen = 0;
|
||
tls_uint8array_to_bytes(request_context, request_context_len, NULL, &datalen);
|
||
tls13_certificate_list_to_bytes(certs, certslen, NULL, &datalen);
|
||
if (datalen > TLS_MAX_HANDSHAKE_DATA_SIZE) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
data = tls_handshake_data(tls_record_data(record));
|
||
datalen = 0;
|
||
tls_uint8array_to_bytes(request_context, request_context_len, &data, &datalen);
|
||
tls13_certificate_list_to_bytes(certs, certslen, &data, &datalen);
|
||
tls_record_set_handshake(record, recordlen, type, NULL, datalen);
|
||
|
||
return 1;
|
||
}
|
||
|
||
int tls13_record_get_handshake_certificate(const uint8_t *record,
|
||
const uint8_t **cert_request_context, size_t *cert_request_context_len,
|
||
const uint8_t **cert_list, size_t *cert_list_len)
|
||
{
|
||
int type;
|
||
const uint8_t *p;
|
||
size_t len;
|
||
|
||
if (tls_record_get_handshake(record, &type, &p, &len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (type != TLS_handshake_certificate) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (tls_uint8array_from_bytes(cert_request_context, cert_request_context_len, &p, &len) != 1
|
||
|| tls_uint24array_from_bytes(cert_list, cert_list_len, &p, &len) != 1
|
||
|| tls_length_is_zero(len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (*cert_list == NULL) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
|
||
|
||
/*
|
||
finished_key = HKDF-Expand-Label(BaseKey, "finished", "", Hash.length)
|
||
|
||
struct {
|
||
opaque verify_data[Hash.length];
|
||
} Finished;
|
||
|
||
verify_data = HMAC(finished_key, Hash(Handshake Context, Certificate*, CertificateVerify*))
|
||
Hash = SM3, SHA256 or SHA384
|
||
*/
|
||
|
||
|
||
int tls13_record_set_handshake_finished(uint8_t *record, size_t *recordlen,
|
||
const uint8_t *verify_data, size_t verify_data_len)
|
||
{
|
||
int type = TLS_handshake_finished;
|
||
if (!record || !recordlen || !verify_data) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
tls_record_set_handshake(record, recordlen, type, verify_data, verify_data_len);
|
||
return 1;
|
||
}
|
||
|
||
int tls13_record_get_handshake_finished(const uint8_t *record,
|
||
const uint8_t **verify_data, size_t *verify_data_len)
|
||
{
|
||
int type;
|
||
|
||
if (tls_record_get_handshake(record, &type, verify_data, verify_data_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (type != TLS_handshake_finished) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (*verify_data_len != SM3_DIGEST_SIZE
|
||
&& *verify_data_len != SHA384_DIGEST_SIZE) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
|
||
int tls13_padding_len_rand(size_t *padding_len)
|
||
{
|
||
uint8_t val;
|
||
rand_bytes(&val, 1);
|
||
*padding_len = val % 128;
|
||
return 1;
|
||
}
|
||
|
||
|
||
|
||
int tls13_cipher_suite_get(int cipher_suite, const DIGEST **digest, const BLOCK_CIPHER **cipher)
|
||
{
|
||
switch (cipher_suite) {
|
||
case TLS_cipher_sm4_gcm_sm3:
|
||
*digest = DIGEST_sm3();
|
||
*cipher = BLOCK_CIPHER_sm4();
|
||
break;
|
||
case TLS_cipher_aes_128_gcm_sha256:
|
||
*digest = DIGEST_sha256();
|
||
*cipher = BLOCK_CIPHER_aes128();
|
||
break;
|
||
default:
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
|
||
|
||
/*
|
||
Client Server
|
||
|
||
Key ^ ClientHello
|
||
Exch | + key_share*
|
||
| + signature_algorithms*
|
||
| + psk_key_exchange_modes*
|
||
v + pre_shared_key* -------->
|
||
ServerHello ^ Key
|
||
+ key_share* | Exch
|
||
+ pre_shared_key* v
|
||
|
||
|
||
| ecdhe => handshake_secret |
|
||
| handshake_secret => master_secret |
|
||
| handshake_secret, client_hello, server_hello |
|
||
| => client_handshake_traffic_secret |
|
||
| => server_handshake_traffic_secret |
|
||
|
||
|
||
{EncryptedExtensions} ^ Server
|
||
{CertificateRequest*} v Params
|
||
{Certificate} ^
|
||
{CertificateVerify} | Auth
|
||
{Finished} v
|
||
|
||
+ master_secret, ClientHello .. server Finished
|
||
=> server_application_traffic_secret_0
|
||
|
||
<-------- [Application Data*]
|
||
|
||
^ {Certificate*}
|
||
Auth | {CertificateVerify*}
|
||
v {Finished} -------->
|
||
|
||
|
||
+ master_secret, ClientHello .. server Finished
|
||
=> client_application_traffic_secret_0
|
||
|
||
[Application Data] <-------> [Application Data]
|
||
|
||
|
||
TLS 1.3的区别：
|
||
|
||
* 首先在最开始的握手阶段就协商好了密钥，因此握手之后传输的就是加密消息了
|
||
* 因此在第二阶段，双方不再发送ServerKeyExchange和ClientKeyExchange
|
||
* 服务器先发送CertificateRequest，再发送Certificate
|
||
* 没有ChangeCipherSpec了
|
||
* 在握手阶段就需要加密，并且Certificate也在其中，因此需要格外的大的密文数据缓冲
|
||
|
||
0
|
||
|
|
||
v
|
||
[1] PSK -> HKDF-Extract = Early Secret
|
||
|
|
||
[2] +-----> Derive-Secret(., "ext binder" | "res binder", "")
|
||
| = binder_key
|
||
|
|
||
[3] +-----> Derive-Secret(., "c e traffic", ClientHello)
|
||
| = client_early_traffic_secret
|
||
|
|
||
[4] +-----> Derive-Secret(., "e exp master", ClientHello)
|
||
| = early_exporter_master_secret
|
||
v
|
||
[5] Derive-Secret(., "derived", "")
|
||
|
|
||
v
|
||
[6] (EC)DHE -> HKDF-Extract = Handshake Secret
|
||
|
|
||
[7] +-----> Derive-Secret(., "c hs traffic",
|
||
| ClientHello...ServerHello)
|
||
| = client_handshake_traffic_secret
|
||
|
|
||
[8] +-----> Derive-Secret(., "s hs traffic",
|
||
| ClientHello...ServerHello)
|
||
| = server_handshake_traffic_secret
|
||
v
|
||
[9] Derive-Secret(., "derived", "")
|
||
|
|
||
v
|
||
[10] 0 -> HKDF-Extract = Master Secret
|
||
|
|
||
[11] +-----> Derive-Secret(., "c ap traffic",
|
||
| ClientHello...server Finished)
|
||
| = client_application_traffic_secret_0
|
||
|
|
||
[12] +-----> Derive-Secret(., "s ap traffic",
|
||
| ClientHello...server Finished)
|
||
| = server_application_traffic_secret_0
|
||
|
|
||
[13] +-----> Derive-Secret(., "exp master",
|
||
| ClientHello...server Finished)
|
||
| = exporter_master_secret
|
||
|
|
||
[14] +-----> Derive-Secret(., "res master",
|
||
ClientHello...client Finished)
|
||
= resumption_master_secret
|
||
|
||
*/
|
||
|
||
|
||
|
||
int tls13_do_connect(TLS_CONNECT *conn)
|
||
{
|
||
uint8_t *record = conn->record;
|
||
uint8_t *enced_record = conn->enced_record;
|
||
size_t recordlen;
|
||
|
||
size_t enced_recordlen;
|
||
|
||
|
||
int type;
|
||
const uint8_t *data;
|
||
size_t datalen;
|
||
|
||
int protocol;
|
||
uint8_t client_random[32];
|
||
uint8_t server_random[32];
|
||
int cipher_suite;
|
||
const uint8_t *random;
|
||
const uint8_t *session_id;
|
||
size_t session_id_len;
|
||
|
||
int protocols[] = { TLS_protocol_tls13 };
|
||
int supported_groups[] = { TLS_curve_sm2p256v1 };
|
||
int sign_algors[] = { TLS_sig_sm2sig_sm3 };
|
||
|
||
uint8_t client_exts[TLS_MAX_EXTENSIONS_SIZE];
|
||
size_t client_exts_len;
|
||
const uint8_t *server_exts;
|
||
size_t server_exts_len;
|
||
|
||
uint8_t sig[TLS_MAX_SIGNATURE_SIZE];
|
||
size_t siglen = sizeof(sig);
|
||
uint8_t verify_data[32];
|
||
size_t verify_data_len;
|
||
|
||
int server_sign_algor;
|
||
const uint8_t *server_sig;
|
||
size_t server_siglen;
|
||
const uint8_t *server_verify_data;
|
||
size_t server_verify_data_len;
|
||
|
||
SM2_KEY client_ecdhe;
|
||
SM2_POINT server_ecdhe_public;
|
||
SM2_KEY server_sign_key;
|
||
|
||
const DIGEST *digest = DIGEST_sm3();
|
||
DIGEST_CTX dgst_ctx; // secret generation过程中需要ClientHello等数据输入的
|
||
DIGEST_CTX null_dgst_ctx; // secret generation过程中不需要握手数据的
|
||
const BLOCK_CIPHER *cipher = NULL;
|
||
size_t padding_len;
|
||
|
||
uint8_t zeros[32] = {0};
|
||
uint8_t psk[32] = {0};
|
||
uint8_t early_secret[32];
|
||
uint8_t handshake_secret[32];
|
||
uint8_t master_secret[32];
|
||
uint8_t client_handshake_traffic_secret[32];
|
||
uint8_t server_handshake_traffic_secret[32];
|
||
uint8_t client_application_traffic_secret[32];
|
||
uint8_t server_application_traffic_secret[32];
|
||
uint8_t client_write_key[16];
|
||
uint8_t server_write_key[16];
|
||
|
||
|
||
const uint8_t *request_context;
|
||
size_t request_context_len;
|
||
const uint8_t *cert_request_exts;
|
||
size_t cert_request_extslen;
|
||
const uint8_t *cert_list;
|
||
size_t cert_list_len;
|
||
const uint8_t *cert;
|
||
size_t certlen;
|
||
|
||
|
||
conn->is_client = 1;
|
||
tls_record_set_protocol(enced_record, TLS_protocol_tls12);
|
||
|
||
digest_init(&dgst_ctx, digest);
|
||
null_dgst_ctx = dgst_ctx;
|
||
|
||
|
||
// send ClientHello
|
||
tls_trace("send ClientHello\n");
|
||
tls_record_set_protocol(record, TLS_protocol_tls1);
|
||
rand_bytes(client_random, 32); // TLS 1.3 Random 不再包含 UNIX Time
|
||
sm2_key_generate(&client_ecdhe);
|
||
tls13_client_hello_exts_set(client_exts, &client_exts_len, sizeof(client_exts), &(client_ecdhe.public_key));
|
||
tls_record_set_handshake_client_hello(record, &recordlen,
|
||
TLS_protocol_tls12, client_random, NULL, 0,
|
||
tls13_ciphers, sizeof(tls13_ciphers)/sizeof(tls13_ciphers[0]),
|
||
client_exts, client_exts_len);
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
if (tls_record_send(record, recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
// 此时尚未确定digest算法，因此无法digest_update
|
||
|
||
|
||
// recv ServerHello
|
||
tls_trace("recv ServerHello\n");
|
||
if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
tls13_record_trace(stderr, enced_record, enced_recordlen, 0, 0);
|
||
if (tls_record_get_handshake_server_hello(enced_record,
|
||
&protocol, &random, &session_id, &session_id_len,
|
||
&cipher_suite, &server_exts, &server_exts_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (protocol != TLS_protocol_tls12) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_protocol_version);
|
||
return -1;
|
||
}
|
||
memcpy(server_random, random, 32);
|
||
memcpy(conn->session_id, session_id, session_id_len);
|
||
conn->session_id_len = session_id_len;
|
||
if (tls_cipher_suite_in_list(cipher_suite,
|
||
tls13_ciphers, sizeof(tls13_ciphers)/sizeof(tls13_ciphers[0])) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_handshake_failure);
|
||
return -1;
|
||
}
|
||
conn->cipher_suite = cipher_suite;
|
||
if (tls13_server_hello_extensions_get(server_exts, server_exts_len, &server_ecdhe_public) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_handshake_failure);
|
||
return -1;
|
||
}
|
||
conn->protocol = TLS_protocol_tls13;
|
||
|
||
tls13_cipher_suite_get(conn->cipher_suite, &digest, &cipher);
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
digest_update(&dgst_ctx, enced_record + 5, enced_recordlen - 5);
|
||
|
||
|
||
printf("generate handshake secrets\n");
|
||
/*
|
||
generate handshake keys
|
||
uint8_t client_write_key[32]
|
||
uint8_t server_write_key[32]
|
||
uint8_t client_write_iv[12]
|
||
uint8_t server_write_iv[12]
|
||
*/
|
||
sm2_ecdh(&client_ecdhe, &server_ecdhe_public, &server_ecdhe_public);
|
||
/* [1] */ tls13_hkdf_extract(digest, zeros, psk, early_secret);
|
||
/* [5] */ tls13_derive_secret(early_secret, "derived", &null_dgst_ctx, handshake_secret);
|
||
/* [6] */ tls13_hkdf_extract(digest, handshake_secret, (uint8_t *)&server_ecdhe_public, handshake_secret);
|
||
/* [7] */ tls13_derive_secret(handshake_secret, "c hs traffic", &dgst_ctx, client_handshake_traffic_secret);
|
||
/* [8] */ tls13_derive_secret(handshake_secret, "s hs traffic", &dgst_ctx, server_handshake_traffic_secret);
|
||
/* [9] */ tls13_derive_secret(handshake_secret, "derived", &null_dgst_ctx, master_secret);
|
||
/* [10] */ tls13_hkdf_extract(digest, master_secret, zeros, master_secret);
|
||
//[sender]_write_key = HKDF-Expand-Label(Secret, "key", "", key_length)
|
||
//[sender]_write_iv = HKDF-Expand-Label(Secret, "iv", "", iv_length)
|
||
//[sender] in {server, client}
|
||
tls13_hkdf_expand_label(digest, server_handshake_traffic_secret, "key", NULL, 0, 16, server_write_key);
|
||
tls13_hkdf_expand_label(digest, server_handshake_traffic_secret, "iv", NULL, 0, 12, conn->server_write_iv);
|
||
block_cipher_set_encrypt_key(&conn->server_write_key, cipher, server_write_key);
|
||
memset(conn->server_seq_num, 0, 8);
|
||
tls13_hkdf_expand_label(digest, client_handshake_traffic_secret, "key", NULL, 0, 16, client_write_key);
|
||
tls13_hkdf_expand_label(digest, client_handshake_traffic_secret, "iv", NULL, 0, 12, conn->client_write_iv);
|
||
block_cipher_set_encrypt_key(&conn->client_write_key, cipher, client_write_key);
|
||
memset(conn->client_seq_num, 0, 8);
|
||
/*
|
||
format_bytes(stderr, 0, 4, "client_write_key", client_write_key, 16);
|
||
format_bytes(stderr, 0, 4, "server_write_key", server_write_key, 16);
|
||
format_bytes(stderr, 0, 4, "client_write_iv", conn->client_write_iv, 12);
|
||
format_bytes(stderr, 0, 4, "server_write_iv", conn->server_write_iv, 12);
|
||
format_print(stderr, 0, 0, "\n");
|
||
*/
|
||
|
||
// recv {EncryptedExtensions}
|
||
printf("recv {EncryptedExtensions}\n");
|
||
if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_handshake_failure);
|
||
return -1;
|
||
}
|
||
if (tls13_record_decrypt(&conn->server_write_key, conn->server_write_iv,
|
||
conn->server_seq_num, enced_record, enced_recordlen,
|
||
record, &recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_bad_record_mac);
|
||
return -1;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
if (tls13_record_get_handshake_encrypted_extensions(record) != 1) {
|
||
tls_send_alert(conn, TLS_alert_handshake_failure);
|
||
error_print();
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->server_seq_num);
|
||
|
||
|
||
// recv {CertififcateRequest*} or {Certificate}
|
||
if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_handshake_failure);
|
||
return -1;
|
||
}
|
||
if (tls13_record_decrypt(&conn->server_write_key, conn->server_write_iv,
|
||
conn->server_seq_num, enced_record, enced_recordlen,
|
||
record, &recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_bad_record_mac);
|
||
return -1;
|
||
}
|
||
if (tls_record_get_handshake(record, &type, &data, &datalen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_handshake_failure);
|
||
return -1;
|
||
}
|
||
if (type == TLS_handshake_certificate_request) {
|
||
tls_trace("recv {CertificateRequest*}\n");
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
if (tls13_record_get_handshake_certificate_request(record,
|
||
&request_context, &request_context_len,
|
||
&cert_request_exts, &cert_request_extslen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_handshake_failure);
|
||
return -1;
|
||
}
|
||
// 当前忽略 request_context 和 cert_request_exts
|
||
// request_context 应该为空，当前实现中不支持Post-Handshake Auth
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->server_seq_num);
|
||
|
||
|
||
// recv {Certificate}
|
||
if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_handshake_failure);
|
||
return -1;
|
||
}
|
||
if (tls13_record_decrypt(&conn->server_write_key, conn->server_write_iv,
|
||
conn->server_seq_num, enced_record, enced_recordlen,
|
||
record, &recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_bad_record_mac);
|
||
return -1;
|
||
}
|
||
} else {
|
||
conn->client_certs_len = 0;
|
||
// 清空客户端签名密钥
|
||
}
|
||
|
||
// recv {Certificate}
|
||
tls_trace("recv {Certificate}\n");
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
if (tls13_record_get_handshake_certificate(record,
|
||
&request_context, &request_context_len,
|
||
&cert_list, &cert_list_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (tls13_process_certificate_list(cert_list, cert_list_len, conn->server_certs, &conn->server_certs_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (x509_certs_get_cert_by_index(conn->server_certs, conn->server_certs_len, 0, &cert, &certlen) != 1
|
||
|| x509_cert_get_subject_public_key(cert, certlen, &server_sign_key) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->server_seq_num);
|
||
|
||
|
||
// recv {CertificateVerify}
|
||
tls_trace("recv {CertificateVerify}\n");
|
||
if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (tls13_record_decrypt(&conn->server_write_key, conn->server_write_iv,
|
||
conn->server_seq_num, enced_record, enced_recordlen,
|
||
record, &recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_bad_record_mac);
|
||
return -1;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
if (tls13_record_get_handshake_certificate_verify(record,
|
||
&server_sign_algor, &server_sig, &server_siglen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (server_sign_algor != TLS_sig_sm2sig_sm3) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (tls13_verify_certificate_verify(TLS_server_mode, &server_sign_key, TLS13_SM2_ID, TLS13_SM2_ID_LENGTH, &dgst_ctx, server_sig, server_siglen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->server_seq_num);
|
||
|
||
|
||
// use Transcript-Hash(Handshake Context, Certificate*, CertificateVerify*)
|
||
tls13_compute_verify_data(server_handshake_traffic_secret,
|
||
&dgst_ctx, verify_data, &verify_data_len);
|
||
|
||
|
||
// recv {Finished}
|
||
tls_trace("recv {Finished}\n");
|
||
if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (tls13_record_decrypt(&conn->server_write_key, conn->server_write_iv,
|
||
conn->server_seq_num, enced_record, enced_recordlen,
|
||
record, &recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_bad_record_mac);
|
||
return -1;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
if (tls13_record_get_handshake_finished(record,
|
||
&server_verify_data, &server_verify_data_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (server_verify_data_len != verify_data_len
|
||
|| memcmp(server_verify_data, verify_data, verify_data_len) != 0) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->server_seq_num);
|
||
|
||
|
||
// generate server_application_traffic_secret
|
||
/* [12] */ tls13_derive_secret(master_secret, "s ap traffic", &dgst_ctx, server_application_traffic_secret);
|
||
// generate client_application_traffic_secret
|
||
/* [11] */ tls13_derive_secret(master_secret, "c ap traffic", &dgst_ctx, client_application_traffic_secret);
|
||
|
||
|
||
if (conn->client_certs_len) {
|
||
int client_sign_algor;
|
||
uint8_t sig[TLS_MAX_SIGNATURE_SIZE];
|
||
size_t siglen;
|
||
|
||
// send client {Certificate*}
|
||
tls_trace("send {Certificate*}\n");
|
||
if (tls13_record_set_handshake_certificate(record, &recordlen,
|
||
NULL, 0, // certificate_request_context
|
||
conn->client_certs, conn->client_certs_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
goto end;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
tls13_padding_len_rand(&padding_len);
|
||
if (tls13_record_encrypt(&conn->client_write_key, conn->client_write_iv,
|
||
conn->client_seq_num, record, recordlen, padding_len,
|
||
enced_record, &enced_recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
return -1;
|
||
}
|
||
if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->client_seq_num);
|
||
|
||
|
||
// send {CertificateVerify*}
|
||
tls_trace("send {CertificateVerify*}\n");
|
||
client_sign_algor = TLS_sig_sm2sig_sm3; // FIXME: 应该放在conn里面
|
||
tls13_sign_certificate_verify(TLS_client_mode, &conn->sign_key, TLS13_SM2_ID, TLS13_SM2_ID_LENGTH, &dgst_ctx, sig, &siglen);
|
||
if (tls13_record_set_handshake_certificate_verify(record, &recordlen,
|
||
client_sign_algor, sig, siglen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
return -1;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
tls13_padding_len_rand(&padding_len);
|
||
if (tls13_record_encrypt(&conn->client_write_key, conn->client_write_iv,
|
||
conn->client_seq_num, record, recordlen, padding_len,
|
||
enced_record, &enced_recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
return -1;
|
||
}
|
||
if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->client_seq_num);
|
||
}
|
||
|
||
// send Client {Finished}
|
||
tls_trace("send {Finished}\n");
|
||
tls13_compute_verify_data(client_handshake_traffic_secret, &dgst_ctx, verify_data, &verify_data_len);
|
||
if (tls_record_set_handshake_finished(record, &recordlen, verify_data, verify_data_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
goto end;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
tls13_padding_len_rand(&padding_len);
|
||
if (tls13_record_encrypt(&conn->client_write_key, conn->client_write_iv,
|
||
conn->client_seq_num, record, recordlen, padding_len,
|
||
enced_record, &enced_recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
goto end;
|
||
}
|
||
if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
goto end;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->client_seq_num);
|
||
|
||
|
||
|
||
// update server_write_key, server_write_iv, reset server_seq_num
|
||
tls13_hkdf_expand_label(digest, server_application_traffic_secret, "key", NULL, 0, 16, server_write_key);
|
||
block_cipher_set_encrypt_key(&conn->server_write_key, cipher, server_write_key);
|
||
tls13_hkdf_expand_label(digest, server_application_traffic_secret, "iv", NULL, 0, 12, conn->server_write_iv);
|
||
memset(conn->server_seq_num, 0, 8);
|
||
/*
|
||
format_print(stderr, 0, 0, "update server secrets\n");
|
||
format_bytes(stderr, 0, 4, "server_write_key", server_write_key, 16);
|
||
format_bytes(stderr, 0, 4, "server_write_iv", conn->server_write_iv, 12);
|
||
format_print(stderr, 0, 0, "\n");
|
||
*/
|
||
|
||
//update client_write_key, client_write_iv, reset client_seq_num
|
||
tls13_hkdf_expand_label(digest, client_application_traffic_secret, "key", NULL, 0, 16, client_write_key);
|
||
tls13_hkdf_expand_label(digest, client_application_traffic_secret, "iv", NULL, 0, 12, conn->client_write_iv);
|
||
block_cipher_set_encrypt_key(&conn->client_write_key, cipher, client_write_key);
|
||
memset(conn->client_seq_num, 0, 8);
|
||
|
||
/*
|
||
format_print(stderr, 0, 0, "update client secrets\n");
|
||
format_bytes(stderr, 0, 4, "client_write_key", client_write_key, 16);
|
||
format_bytes(stderr, 0, 4, "client_write_iv", conn->client_write_iv, 12);
|
||
format_print(stderr, 0, 0, "\n");
|
||
*/
|
||
fprintf(stderr, "Connection established\n");
|
||
|
||
end:
|
||
return 1;
|
||
}
|
||
|
||
int tls13_do_accept(TLS_CONNECT *conn)
|
||
{
|
||
uint8_t *record = conn->record;
|
||
size_t recordlen;
|
||
uint8_t enced_record[25600];
|
||
size_t enced_recordlen = sizeof(enced_record);
|
||
|
||
int server_ciphers[] = { TLS_cipher_sm4_gcm_sm3 };
|
||
|
||
|
||
int protocol;
|
||
const uint8_t *random;
|
||
const uint8_t *session_id;
|
||
size_t session_id_len;
|
||
const uint8_t *client_exts;
|
||
size_t client_exts_len;
|
||
|
||
uint8_t client_random[32];
|
||
uint8_t server_random[32];
|
||
const uint8_t *client_ciphers;
|
||
size_t client_ciphers_len;
|
||
uint8_t server_exts[TLS_MAX_EXTENSIONS_SIZE];
|
||
size_t server_exts_len;
|
||
|
||
SM2_KEY server_ecdhe;
|
||
SM2_POINT client_ecdhe_public;
|
||
SM2_KEY client_sign_key;
|
||
const BLOCK_CIPHER *cipher;
|
||
const DIGEST *digest;
|
||
DIGEST_CTX dgst_ctx;
|
||
DIGEST_CTX null_dgst_ctx;
|
||
size_t padding_len;
|
||
|
||
|
||
uint8_t sig[TLS_MAX_SIGNATURE_SIZE];
|
||
size_t siglen = sizeof(sig);
|
||
|
||
uint8_t verify_data[32];
|
||
size_t verify_data_len;
|
||
|
||
const uint8_t *client_verify_data;
|
||
size_t client_verify_data_len;
|
||
|
||
uint8_t client_write_key[16];
|
||
uint8_t server_write_key[16];
|
||
|
||
uint8_t zeros[32] = {0};
|
||
uint8_t psk[32] = {0};
|
||
uint8_t early_secret[32];
|
||
uint8_t handshake_secret[32];
|
||
uint8_t client_handshake_traffic_secret[32];
|
||
uint8_t server_handshake_traffic_secret[32];
|
||
uint8_t client_application_traffic_secret[32];
|
||
uint8_t server_application_traffic_secret[32];
|
||
uint8_t master_secret[32];
|
||
|
||
const uint8_t *request_context;
|
||
size_t request_context_len;
|
||
const uint8_t *cert_list;
|
||
size_t cert_list_len;
|
||
const uint8_t *cert;
|
||
size_t certlen;
|
||
|
||
|
||
int client_verify = 0;
|
||
if (conn->ca_certs_len)
|
||
client_verify = 1;
|
||
|
||
|
||
// 1. Recv ClientHello
|
||
tls_trace("recv ClientHello\n");
|
||
if (tls_record_recv(record, &recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
if (tls_record_get_handshake_client_hello(record,
|
||
&protocol, &random,
|
||
&session_id, &session_id_len, // 不支持SessionID，不做任何处理
|
||
&client_ciphers, &client_ciphers_len,
|
||
&client_exts, &client_exts_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (protocol != TLS_protocol_tls12) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_protocol_version);
|
||
goto end;
|
||
}
|
||
memcpy(client_random, random, 32);
|
||
if (tls_cipher_suites_select(client_ciphers, client_ciphers_len,
|
||
server_ciphers, sizeof(server_ciphers)/sizeof(int),
|
||
&conn->cipher_suite) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_insufficient_security);
|
||
goto end;
|
||
}
|
||
if (!client_exts) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
tls13_cipher_suite_get(conn->cipher_suite, &digest, &cipher); // 这个函数是否应该放到tls_里面？
|
||
digest_init(&dgst_ctx, digest);
|
||
null_dgst_ctx = dgst_ctx; // 在密钥导出函数中可能输入的消息为空，因此需要一个空的dgst_ctx，这里不对了，应该在tls13_derive_secret里面直接支持NULL！
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
|
||
|
||
// 2. Send ServerHello
|
||
tls_trace("send ServerHello\n");
|
||
rand_bytes(server_random, 32);
|
||
sm2_key_generate(&server_ecdhe);
|
||
if (tls13_process_client_hello_exts(client_exts, client_exts_len,
|
||
&server_ecdhe, &client_ecdhe_public,
|
||
server_exts, &server_exts_len, sizeof(server_exts)) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
tls_record_set_protocol(record, TLS_protocol_tls12);
|
||
if (tls_record_set_handshake_server_hello(record, &recordlen,
|
||
TLS_protocol_tls12, server_random,
|
||
NULL, 0, // openssl的兼容模式在ClientHello中发送SessionID并检查在ServerHello是否返回，用`-no_middlebox`可关闭兼容模式
|
||
conn->cipher_suite, server_exts, server_exts_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
if (tls_record_send(record, recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
|
||
|
||
sm2_ecdh(&server_ecdhe, &client_ecdhe_public, &client_ecdhe_public);
|
||
/* 1 */ tls13_hkdf_extract(digest, zeros, psk, early_secret);
|
||
/* 5 */ tls13_derive_secret(early_secret, "derived", &null_dgst_ctx, handshake_secret);
|
||
/* 6 */ tls13_hkdf_extract(digest, handshake_secret, (uint8_t *)&client_ecdhe_public, handshake_secret);
|
||
/* 7 */ tls13_derive_secret(handshake_secret, "c hs traffic", &dgst_ctx, client_handshake_traffic_secret);
|
||
/* 8 */ tls13_derive_secret(handshake_secret, "s hs traffic", &dgst_ctx, server_handshake_traffic_secret);
|
||
/* 9 */ tls13_derive_secret(handshake_secret, "derived", &null_dgst_ctx, master_secret);
|
||
/* 10 */ tls13_hkdf_extract(digest, master_secret, zeros, master_secret);
|
||
// generate server_write_key, server_write_iv, reset server_seq_num
|
||
tls13_hkdf_expand_label(digest, server_handshake_traffic_secret, "key", NULL, 0, 16, server_write_key);
|
||
block_cipher_set_encrypt_key(&conn->server_write_key, cipher, server_write_key);
|
||
tls13_hkdf_expand_label(digest, server_handshake_traffic_secret, "iv", NULL, 0, 12, conn->server_write_iv);
|
||
memset(conn->server_seq_num, 0, 8);
|
||
// generate client_write_key, client_write_iv, reset client_seq_num
|
||
tls13_hkdf_expand_label(digest, client_handshake_traffic_secret, "key", NULL, 0, 16, client_write_key);
|
||
block_cipher_set_encrypt_key(&conn->client_write_key, cipher, client_write_key);
|
||
tls13_hkdf_expand_label(digest, client_handshake_traffic_secret, "iv", NULL, 0, 12, conn->client_write_iv);
|
||
memset(conn->client_seq_num, 0, 8);
|
||
/*
|
||
format_print(stderr, 0, 0, "generate handshake secrets\n");
|
||
format_bytes(stderr, 0, 4, "server_write_key", server_write_key, 16);
|
||
format_bytes(stderr, 0, 4, "server_write_iv", conn->server_write_iv, 12);
|
||
format_bytes(stderr, 0, 4, "client_write_key", client_write_key, 16);
|
||
format_bytes(stderr, 0, 4, "client_write_iv", conn->client_write_iv, 12);
|
||
format_print(stderr, 0, 0, "\n");
|
||
*/
|
||
|
||
// 3. Send {EncryptedExtensions}
|
||
tls_trace("send {EncryptedExtensions}\n");
|
||
tls_record_set_protocol(record, TLS_protocol_tls12);
|
||
tls13_record_set_handshake_encrypted_extensions(record, &recordlen);
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
tls13_padding_len_rand(&padding_len);
|
||
if (tls13_record_encrypt(&conn->server_write_key, conn->server_write_iv,
|
||
conn->server_seq_num, record, recordlen, padding_len,
|
||
enced_record, &enced_recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
return -1;
|
||
}
|
||
// FIXME: tls13_record_encrypt需要支持握手消息
|
||
// tls_record_data(enced_record)[0] = TLS_handshake_encrypted_extensions;
|
||
if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->server_seq_num);
|
||
|
||
|
||
// send {CertificateRequest*}
|
||
if (client_verify) {
|
||
tls_trace("send {CertificateRequest*}\n");
|
||
|
||
// TODO: 设置certificate_request中的extensions!
|
||
if (tls13_record_set_handshake_certificate_request_default(record, &recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
return -1;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
tls13_padding_len_rand(&padding_len);
|
||
if (tls13_record_encrypt(&conn->server_write_key, conn->server_write_iv,
|
||
conn->server_seq_num, record, recordlen, padding_len,
|
||
enced_record, &enced_recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
return -1;
|
||
}
|
||
if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->server_seq_num);
|
||
}
|
||
|
||
// send Server {Certificate}
|
||
tls_trace("send {Certificate}\n");
|
||
if (tls13_record_set_handshake_certificate(record, &recordlen, NULL, 0, conn->server_certs, conn->server_certs_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
goto end;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
tls13_padding_len_rand(&padding_len);
|
||
if (tls13_record_encrypt(&conn->server_write_key, conn->server_write_iv,
|
||
conn->server_seq_num, record, recordlen, padding_len,
|
||
enced_record, &enced_recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
goto end;
|
||
}
|
||
if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
goto end;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->server_seq_num);
|
||
|
||
|
||
// send Server {CertificateVerify}
|
||
tls_trace("send {CertificateVerify}\n");
|
||
tls13_sign_certificate_verify(TLS_server_mode, &conn->sign_key, TLS13_SM2_ID, TLS13_SM2_ID_LENGTH, &dgst_ctx, sig, &siglen);
|
||
if (tls13_record_set_handshake_certificate_verify(record, &recordlen,
|
||
TLS_sig_sm2sig_sm3, sig, siglen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
goto end;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
tls13_padding_len_rand(&padding_len);
|
||
if (tls13_record_encrypt(&conn->server_write_key, conn->server_write_iv,
|
||
conn->server_seq_num, record, recordlen, padding_len,
|
||
enced_record, &enced_recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
goto end;
|
||
}
|
||
if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
goto end;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->server_seq_num);
|
||
|
||
|
||
// Send Server {Finished}
|
||
tls_trace("send {Finished}\n");
|
||
|
||
// compute server verify_data before digest_update()
|
||
tls13_compute_verify_data(server_handshake_traffic_secret,
|
||
&dgst_ctx, verify_data, &verify_data_len);
|
||
if (tls13_record_set_handshake_finished(record, &recordlen, verify_data, verify_data_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
goto end;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
tls13_padding_len_rand(&padding_len);
|
||
if (tls13_record_encrypt(&conn->server_write_key, conn->server_write_iv,
|
||
conn->server_seq_num, record, recordlen, padding_len,
|
||
enced_record, &enced_recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
goto end;
|
||
}
|
||
if (tls_record_send(enced_record, enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
goto end;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->server_seq_num);
|
||
|
||
// generate server_application_traffic_secret
|
||
/* 12 */ tls13_derive_secret(master_secret, "s ap traffic", &dgst_ctx, server_application_traffic_secret);
|
||
// Generate client_application_traffic_secret
|
||
/* 11 */ tls13_derive_secret(master_secret, "c ap traffic", &dgst_ctx, client_application_traffic_secret);
|
||
// 因为后面还要解密握手消息，因此client application key, iv 等到握手结束之后再更新
|
||
|
||
// Recv Client {Certificate*}
|
||
if (client_verify) {
|
||
tls_trace("recv {Certificate*}\n");
|
||
if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (tls13_record_decrypt(&conn->client_write_key, conn->client_write_iv,
|
||
conn->client_seq_num, enced_record, enced_recordlen,
|
||
record, &recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_bad_record_mac);
|
||
return -1;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
|
||
if (tls13_record_get_handshake_certificate(record,
|
||
&request_context, &request_context_len,
|
||
&cert_list, &cert_list_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (tls13_process_certificate_list(cert_list, cert_list_len, conn->client_certs, &conn->client_certs_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (x509_certs_get_cert_by_index(conn->client_certs, conn->client_certs_len, 0, &cert, &certlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (x509_cert_get_subject_public_key(cert, certlen, &client_sign_key) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->client_seq_num);
|
||
}
|
||
|
||
// Recv client {CertificateVerify*}
|
||
if (client_verify) {
|
||
int client_sign_algor;
|
||
const uint8_t *client_sig;
|
||
size_t client_siglen;
|
||
|
||
tls_trace("recv Client {CertificateVerify*}\n");
|
||
if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (tls13_record_decrypt(&conn->client_write_key, conn->client_write_iv,
|
||
conn->client_seq_num, enced_record, enced_recordlen, record, &recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_bad_record_mac);
|
||
return -1;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
|
||
if (tls13_record_get_handshake_certificate_verify(record, &client_sign_algor, &client_sig, &client_siglen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (tls13_verify_certificate_verify(TLS_client_mode, &client_sign_key, TLS13_SM2_ID, TLS13_SM2_ID_LENGTH, &dgst_ctx, client_sig, client_siglen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_decrypt_error);
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->client_seq_num);
|
||
}
|
||
|
||
// 12. Recv Client {Finished}
|
||
|
||
tls_trace("recv {Finished}\n");
|
||
if (tls_record_recv(enced_record, &enced_recordlen, conn->sock) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (tls13_record_decrypt(&conn->client_write_key, conn->client_write_iv,
|
||
conn->client_seq_num, enced_record, enced_recordlen,
|
||
record, &recordlen) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_bad_record_mac);
|
||
return -1;
|
||
}
|
||
tls13_record_trace(stderr, record, recordlen, 0, 0);
|
||
if (tls13_record_get_handshake_finished(record, &client_verify_data, &client_verify_data_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_unexpected_message);
|
||
return -1;
|
||
}
|
||
if (tls13_compute_verify_data(client_handshake_traffic_secret, &dgst_ctx, verify_data, &verify_data_len) != 1) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_internal_error);
|
||
return -1;
|
||
}
|
||
if (client_verify_data_len != verify_data_len
|
||
|| memcmp(client_verify_data, verify_data, verify_data_len) != 0) {
|
||
error_print();
|
||
tls_send_alert(conn, TLS_alert_bad_record_mac);
|
||
return -1;
|
||
}
|
||
digest_update(&dgst_ctx, record + 5, recordlen - 5);
|
||
tls_seq_num_incr(conn->client_seq_num);
|
||
|
||
|
||
// 注意：OpenSSL兼容模式在此处会收发ChangeCipherSpec报文
|
||
|
||
|
||
// update server_write_key, server_write_iv, reset server_seq_num
|
||
tls13_hkdf_expand_label(digest, server_application_traffic_secret, "key", NULL, 0, 16, server_write_key);
|
||
tls13_hkdf_expand_label(digest, server_application_traffic_secret, "iv", NULL, 0, 12, conn->server_write_iv);
|
||
block_cipher_set_encrypt_key(&conn->server_write_key, cipher, server_write_key);
|
||
memset(conn->server_seq_num, 0, 8);
|
||
/*
|
||
format_print(stderr, 0, 0, "update server secrets\n");
|
||
format_bytes(stderr, 0, 4, "server_write_key", server_write_key, 16);
|
||
format_bytes(stderr, 0, 4, "server_write_iv", conn->server_write_iv, 12);
|
||
format_print(stderr, 0, 0, "\n");
|
||
*/
|
||
|
||
// update client_write_key, client_write_iv
|
||
// reset client_seq_num
|
||
tls13_hkdf_expand_label(digest, client_application_traffic_secret, "key", NULL, 0, 16, client_write_key);
|
||
tls13_hkdf_expand_label(digest, client_application_traffic_secret, "iv", NULL, 0, 12, conn->client_write_iv);
|
||
block_cipher_set_encrypt_key(&conn->client_write_key, cipher, client_write_key);
|
||
memset(conn->client_seq_num, 0, 8);
|
||
/*
|
||
format_print(stderr, 0, 0, "update client secrets\n");
|
||
format_bytes(stderr, 0, 4, "client_write_key", client_write_key, 16);
|
||
format_bytes(stderr, 0, 4, "client_write_iv", conn->client_write_iv, 12);
|
||
format_print(stderr, 0, 0, "\n");
|
||
*/
|
||
|
||
fprintf(stderr, "Connection Established!\n\n");
|
||
|
||
end:
|
||
return 1;
|
||
}
|