ChannelID support.
Implement ChannelID as both a client and server.
diff --git a/ssl/s3_clnt.c b/ssl/s3_clnt.c
index ba0410a..af664de 100644
--- a/ssl/s3_clnt.c
+++ b/ssl/s3_clnt.c
@@ -465,13 +465,14 @@
SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
if (ret <= 0) goto end;
-#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
- s->state=SSL3_ST_CW_FINISHED_A;
-#else
+ s->state=SSL3_ST_CW_FINISHED_A;
+#if !defined(OPENSSL_NO_TLSEXT)
+ if (s->s3->tlsext_channel_id_valid)
+ s->state=SSL3_ST_CW_CHANNEL_ID_A;
+# if !defined(OPENSSL_NO_NEXTPROTONEG)
if (s->s3->next_proto_neg_seen)
s->state=SSL3_ST_CW_NEXT_PROTO_A;
- else
- s->state=SSL3_ST_CW_FINISHED_A;
+# endif
#endif
s->init_num=0;
@@ -497,6 +498,18 @@
case SSL3_ST_CW_NEXT_PROTO_B:
ret=ssl3_send_next_proto(s);
if (ret <= 0) goto end;
+ if (s->s3->tlsext_channel_id_valid)
+ s->state=SSL3_ST_CW_CHANNEL_ID_A;
+ else
+ s->state=SSL3_ST_CW_FINISHED_A;
+ break;
+#endif
+
+#if !defined(OPENSSL_NO_TLSEXT)
+ case SSL3_ST_CW_CHANNEL_ID_A:
+ case SSL3_ST_CW_CHANNEL_ID_B:
+ ret=ssl3_send_channel_id(s);
+ if (ret <= 0) goto end;
s->state=SSL3_ST_CW_FINISHED_A;
break;
#endif
@@ -524,6 +537,18 @@
}
else
{
+ /* This is a non-resumption handshake. If it
+ * involves ChannelID, then record the
+ * handshake hashes at this point in the
+ * session so that any resumption of this
+ * session with ChannelID can sign those
+ * hashes. */
+ if (s->s3->tlsext_channel_id_new)
+ {
+ ret = tls1_record_handshake_hashes_for_channel_id(s);
+ if (ret <= 0)
+ goto end;
+ }
if ((SSL_get_mode(s) & SSL_MODE_HANDSHAKE_CUTTHROUGH)
&& ssl3_can_cutthrough(s)
&& s->s3->previous_server_finished_len == 0 /* no cutthrough on renegotiation (would complicate the state machine) */
@@ -3135,7 +3160,8 @@
return(0);
}
-#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#if !defined(OPENSSL_NO_TLSEXT)
+# if !defined(OPENSSL_NO_NEXTPROTONEG)
int ssl3_send_next_proto(SSL *s)
{
unsigned int len, padding_len;
@@ -3159,7 +3185,136 @@
return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
}
-#endif /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
+
+# endif /* !OPENSSL_NO_NEXTPROTONEG */
+
+int ssl3_send_channel_id(SSL *s)
+ {
+ unsigned char *d;
+ int ret = -1, public_key_len;
+ EVP_MD_CTX md_ctx;
+ size_t sig_len;
+ ECDSA_SIG *sig = NULL;
+ unsigned char *public_key = NULL, *derp, *der_sig = NULL;
+
+ if (s->state != SSL3_ST_CW_CHANNEL_ID_A)
+ return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
+
+ if (!s->tlsext_channel_id_private && s->ctx->channel_id_cb)
+ {
+ EVP_PKEY *key = NULL;
+ s->ctx->channel_id_cb(s, &key);
+ if (key != NULL)
+ {
+ s->tlsext_channel_id_private = key;
+ }
+ }
+ if (!s->tlsext_channel_id_private)
+ {
+ s->rwstate=SSL_CHANNEL_ID_LOOKUP;
+ return (-1);
+ }
+ s->rwstate=SSL_NOTHING;
+
+ d = (unsigned char *)s->init_buf->data;
+ *(d++)=SSL3_MT_ENCRYPTED_EXTENSIONS;
+ l2n3(2 + 2 + TLSEXT_CHANNEL_ID_SIZE, d);
+ if (s->s3->tlsext_channel_id_new)
+ s2n(TLSEXT_TYPE_channel_id_new, d);
+ else
+ s2n(TLSEXT_TYPE_channel_id, d);
+ s2n(TLSEXT_CHANNEL_ID_SIZE, d);
+
+ EVP_MD_CTX_init(&md_ctx);
+
+ public_key_len = i2d_PublicKey(s->tlsext_channel_id_private, NULL);
+ if (public_key_len <= 0)
+ {
+ OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_CANNOT_SERIALIZE_PUBLIC_KEY);
+ goto err;
+ }
+ /* i2d_PublicKey will produce an ANSI X9.62 public key which, for a
+ * P-256 key, is 0x04 (meaning uncompressed) followed by the x and y
+ * field elements as 32-byte, big-endian numbers. */
+ if (public_key_len != 65)
+ {
+ OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_CHANNEL_ID_NOT_P256);
+ goto err;
+ }
+ public_key = OPENSSL_malloc(public_key_len);
+ if (!public_key)
+ {
+ OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ derp = public_key;
+ i2d_PublicKey(s->tlsext_channel_id_private, &derp);
+
+ if (EVP_DigestSignInit(&md_ctx, NULL, EVP_sha256(), NULL,
+ s->tlsext_channel_id_private) != 1)
+ {
+ OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_EVP_DIGESTSIGNINIT_FAILED);
+ goto err;
+ }
+
+ if (!tls1_channel_id_hash(&md_ctx, s))
+ goto err;
+
+ if (!EVP_DigestSignFinal(&md_ctx, NULL, &sig_len))
+ {
+ OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_EVP_DIGESTSIGNFINAL_FAILED);
+ goto err;
+ }
+
+ der_sig = OPENSSL_malloc(sig_len);
+ if (!der_sig)
+ {
+ OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ if (!EVP_DigestSignFinal(&md_ctx, der_sig, &sig_len))
+ {
+ OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_EVP_DIGESTSIGNFINAL_FAILED);
+ goto err;
+ }
+
+ derp = der_sig;
+ sig = d2i_ECDSA_SIG(NULL, (const unsigned char**) &derp, sig_len);
+ if (sig == NULL)
+ {
+ OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_D2I_ECDSA_SIG);
+ goto err;
+ }
+
+ /* The first byte of public_key will be 0x4, denoting an uncompressed key. */
+ memcpy(d, public_key + 1, 64);
+ d += 64;
+ memset(d, 0, 2 * 32);
+ BN_bn2bin(sig->r, d + 32 - BN_num_bytes(sig->r));
+ d += 32;
+ BN_bn2bin(sig->s, d + 32 - BN_num_bytes(sig->s));
+ d += 32;
+
+ s->state = SSL3_ST_CW_CHANNEL_ID_B;
+ s->init_num = 4 + 2 + 2 + TLSEXT_CHANNEL_ID_SIZE;
+ s->init_off = 0;
+
+ ret = ssl3_do_write(s, SSL3_RT_HANDSHAKE);
+
+err:
+ EVP_MD_CTX_cleanup(&md_ctx);
+ if (public_key)
+ OPENSSL_free(public_key);
+ if (der_sig)
+ OPENSSL_free(der_sig);
+ if (sig)
+ ECDSA_SIG_free(sig);
+
+ return ret;
+ }
+#endif /* !OPENSSL_NO_TLSEXT */
/* Check to see if handshake is full or resumed. Usually this is just a
* case of checking to see if a cache hit has occurred. In the case of
