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tls: prepare for ECDH_anon ciphers

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-12-10 19:19:38 +01:00
parent c67ff8a1b0
commit 3a4d5a73a8
1 changed files with 14 additions and 7 deletions
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21
networking/tls.c
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@ -525,9 +525,9 @@ static unsigned hmac(tls_state_t *tls, uint8_t *out, uint8_t *key, unsigned key_
va_start(va, key_size);
hmac_begin(&pre, key, key_size,
(!ENABLE_FEATURE_TLS_SHA1 || tls->MAC_size == SHA256_OUTSIZE)
? sha256_begin
: sha1_begin
(ENABLE_FEATURE_TLS_SHA1 && tls->MAC_size == SHA1_OUTSIZE)
? sha1_begin
: sha256_begin
);
len = hmac_sha_precomputed_v(&pre, out, va);
@ -1486,7 +1486,7 @@ static void send_client_hello_and_alloc_hsd(tls_state_t *tls, const char *sni)
{
#define NUM_CIPHERS (7 + 6 * ENABLE_FEATURE_TLS_SHA1 + ALLOW_RSA_NULL_SHA256)
static const uint8_t ciphers[] = {
0x00,(1 + NUM_CIPHERS) * 2, //len16_be
0x00,2 + NUM_CIPHERS*2, //len16_be
0x00,0xFF, //not a cipher - TLS_EMPTY_RENEGOTIATION_INFO_SCSV
/* ^^^^^^ RFC 5746 Renegotiation Indication Extension - some servers will refuse to work with us otherwise */
#if ENABLE_FEATURE_TLS_SHA1
@ -1494,6 +1494,8 @@ static void send_client_hello_and_alloc_hsd(tls_state_t *tls, const char *sni)
0xC0,0x0A, // 2 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA - ok: wget https://is.gd/
0xC0,0x13, // 3 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - ok: openssl s_server ... -cipher ECDHE-RSA-AES128-SHA
0xC0,0x14, // 4 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - ok: openssl s_server ... -cipher ECDHE-RSA-AES256-SHA (might fail with older openssl)
// 0xC0,0x18, // TLS_ECDH_anon_WITH_AES_128_CBC_SHA
// 0xC0,0x19, // TLS_ECDH_anon_WITH_AES_256_CBC_SHA
#endif
0xC0,0x23, // 5 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 - ok: wget https://is.gd/
// 0xC0,0x24, // TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 - can't do SHA384 yet
@ -1548,7 +1550,7 @@ static void send_client_hello_and_alloc_hsd(tls_state_t *tls, const char *sni)
uint8_t session_id_len;
/* uint8_t session_id[]; */
uint8_t cipherid_len16_hi, cipherid_len16_lo;
uint8_t cipherid[(1 + NUM_CIPHERS) * 2]; /* actually variable */
uint8_t cipherid[2 + NUM_CIPHERS*2]; /* actually variable */
uint8_t comprtypes_len;
uint8_t comprtypes[1]; /* actually variable */
/* Extensions (SNI shown):
@ -1596,7 +1598,7 @@ static void send_client_hello_and_alloc_hsd(tls_state_t *tls, const char *sni)
memset(record->rand32, 0x11, sizeof(record->rand32));
/* record->session_id_len = 0; - already is */
BUILD_BUG_ON(sizeof(ciphers) != 2 + (1 + NUM_CIPHERS) * 2 + 2);
BUILD_BUG_ON(sizeof(ciphers) != 2 + 2 + NUM_CIPHERS*2 + 2);
memcpy(&record->cipherid_len16_hi, ciphers, sizeof(ciphers));
ptr = (void*)(record + 1);
@ -1698,6 +1700,8 @@ static void get_server_hello(tls_state_t *tls)
0xC0,0x0A, // 2 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA - ok: wget https://is.gd/
0xC0,0x13, // 3 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - ok: openssl s_server ... -cipher ECDHE-RSA-AES128-SHA
0xC0,0x14, // 4 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - ok: openssl s_server ... -cipher ECDHE-RSA-AES256-SHA (might fail with older openssl)
// 0xC0,0x18, // TLS_ECDH_anon_WITH_AES_128_CBC_SHA
// 0xC0,0x19, // TLS_ECDH_anon_WITH_AES_256_CBC_SHA
#endif
0xC0,0x23, // 5 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 - ok: wget https://is.gd/
// 0xC0,0x24, // TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 - can't do SHA384 yet
@ -1705,6 +1709,7 @@ static void get_server_hello(tls_state_t *tls)
// 0xC0,0x28, // TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 - can't do SHA384 yet
0xC0,0x2B, // 7 TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 - ok: wget https://is.gd/
// 0xC0,0x2C, // TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 - wget https://is.gd/: "TLS error from peer (alert code 20): bad MAC"
//TODO: GCM_SHA384 ciphers can be supported, only need sha384-based PRF?
0xC0,0x2F, // 8 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 - ok: openssl s_server ... -cipher ECDHE-RSA-AES128-GCM-SHA256
// 0xC0,0x30, // TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 - openssl s_server ... -cipher ECDHE-RSA-AES256-GCM-SHA384: "decryption failed or bad record mac"
//possibly these too:
@ -1722,7 +1727,9 @@ static void get_server_hello(tls_state_t *tls)
0x00,0x3D, //12 TLS_RSA_WITH_AES_256_CBC_SHA256 - ok: openssl s_server ... -cipher AES256-SHA256
0x00,0x9C, //13 TLS_RSA_WITH_AES_128_GCM_SHA256 - ok: openssl s_server ... -cipher AES128-GCM-SHA256
// 0x00,0x9D, // TLS_RSA_WITH_AES_256_GCM_SHA384 - openssl s_server ... -cipher AES256-GCM-SHA384: "decryption failed or bad record mac"
#if ALLOW_RSA_NULL_SHA256
0x00,0x3B, // TLS_RSA_WITH_NULL_SHA256
#endif
#endif
cipherid1 = cipherid[1];
tls->cipher_id = 0x100 * cipherid[0] + cipherid1;
@ -1736,7 +1743,7 @@ static void get_server_hello(tls_state_t *tls)
/* Odd numbered C0xx use AES128 (even ones use AES256) */
tls->key_size = AES128_KEYSIZE;
}
if (ENABLE_FEATURE_TLS_SHA1 && cipherid1 <= 0x14) {
if (ENABLE_FEATURE_TLS_SHA1 && cipherid1 <= 0x19) {
tls->MAC_size = SHA1_OUTSIZE;
} else
if (cipherid1 >= 0x2B && cipherid1 <= 0x30) {