tls: prepare for ECDH_anon ciphers

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/networking/tls.c b/networking/tls.c
index 253d687b459cb03f499b5de9b1a0cbaa63137128..b90f45e8bdbb139923d998cabcb47e347b3f6df9 100644 (file)
--- a/networking/tls.c
+++ b/networking/tls.c
@@ -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) {