+#endif
+
+ return 1;
+ }
+
+int ssl_prepare_serverhello_tlsext(SSL *s)
+ {
+#ifndef OPENSSL_NO_EC
+ /* If we are server and using an ECC cipher suite, send the point formats we support
+ * if the client sent us an ECPointsFormat extension. Note that the server is not
+ * supposed to send an EllipticCurves extension.
+ */
+
+ unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
+ unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
+ int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
+ using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
+
+ if (using_ecc)
+ {
+ if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
+ if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
+ {
+ SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
+ return -1;
+ }
+ s->tlsext_ecpointformatlist_length = 3;
+ s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
+ s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
+ s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
+ }
+#endif /* OPENSSL_NO_EC */
+
+ return 1;
+ }
+
+int ssl_check_clienthello_tlsext(SSL *s)
+ {
+ int ret=SSL_TLSEXT_ERR_NOACK;
+ int al = SSL_AD_UNRECOGNIZED_NAME;
+
+#ifndef OPENSSL_NO_EC
+ /* The handling of the ECPointFormats extension is done elsewhere, namely in
+ * ssl3_choose_cipher in s3_lib.c.
+ */
+ /* The handling of the EllipticCurves extension is done elsewhere, namely in
+ * ssl3_choose_cipher in s3_lib.c.
+ */
+#endif
+
+ if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
+ ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
+ else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
+ ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
+
+ /* If status request then ask callback what to do.
+ * Note: this must be called after servername callbacks in case
+ * the certificate has changed.
+ */
+ if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
+ {
+ int r;
+ r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
+ switch (r)
+ {
+ /* We don't want to send a status request response */
+ case SSL_TLSEXT_ERR_NOACK:
+ s->tlsext_status_expected = 0;
+ break;
+ /* status request response should be sent */
+ case SSL_TLSEXT_ERR_OK:
+ if (s->tlsext_ocsp_resp)
+ s->tlsext_status_expected = 1;
+ else
+ s->tlsext_status_expected = 0;
+ break;
+ /* something bad happened */
+ case SSL_TLSEXT_ERR_ALERT_FATAL:
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_INTERNAL_ERROR;
+ goto err;
+ }
+ }
+ else
+ s->tlsext_status_expected = 0;
+
+#ifdef TLSEXT_TYPE_opaque_prf_input
+ {
+ /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
+ * but we might be sending an alert in response to the client hello,
+ * so this has to happen here in ssl_check_clienthello_tlsext(). */
+
+ int r = 1;
+
+ if (s->ctx->tlsext_opaque_prf_input_callback != 0)
+ {
+ r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
+ if (!r)
+ {
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_INTERNAL_ERROR;
+ goto err;
+ }
+ }
+
+ if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
+ OPENSSL_free(s->s3->server_opaque_prf_input);
+ s->s3->server_opaque_prf_input = NULL;
+
+ if (s->tlsext_opaque_prf_input != NULL)
+ {
+ if (s->s3->client_opaque_prf_input != NULL &&
+ s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
+ {
+ /* can only use this extension if we have a server opaque PRF input
+ * of the same length as the client opaque PRF input! */
+
+ if (s->tlsext_opaque_prf_input_len == 0)
+ s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
+ else
+ s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
+ if (s->s3->server_opaque_prf_input == NULL)
+ {
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_INTERNAL_ERROR;
+ goto err;
+ }
+ s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
+ }
+ }
+
+ if (r == 2 && s->s3->server_opaque_prf_input == NULL)
+ {
+ /* The callback wants to enforce use of the extension,
+ * but we can't do that with the client opaque PRF input;
+ * abort the handshake.
+ */
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ }
+ }
+
+#endif
+ err:
+ switch (ret)
+ {
+ case SSL_TLSEXT_ERR_ALERT_FATAL:
+ ssl3_send_alert(s,SSL3_AL_FATAL,al);
+ return -1;
+
+ case SSL_TLSEXT_ERR_ALERT_WARNING:
+ ssl3_send_alert(s,SSL3_AL_WARNING,al);
+ return 1;
+
+ case SSL_TLSEXT_ERR_NOACK:
+ s->servername_done=0;
+ default:
+ return 1;
+ }
+ }
+
+int ssl_check_serverhello_tlsext(SSL *s)
+ {
+ int ret=SSL_TLSEXT_ERR_NOACK;
+ int al = SSL_AD_UNRECOGNIZED_NAME;
+
+#ifndef OPENSSL_NO_EC
+ /* If we are client and using an elliptic curve cryptography cipher
+ * suite, then if server returns an EC point formats lists extension
+ * it must contain uncompressed.
+ */
+ unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
+ unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
+ if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
+ (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
+ ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
+ {
+ /* we are using an ECC cipher */
+ size_t i;
+ unsigned char *list;
+ int found_uncompressed = 0;
+ list = s->session->tlsext_ecpointformatlist;
+ for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
+ {
+ if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
+ {
+ found_uncompressed = 1;
+ break;
+ }
+ }
+ if (!found_uncompressed)
+ {
+ SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
+ return -1;
+ }
+ }
+ ret = SSL_TLSEXT_ERR_OK;
+#endif /* OPENSSL_NO_EC */
+
+ if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
+ ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
+ else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
+ ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
+
+#ifdef TLSEXT_TYPE_opaque_prf_input
+ if (s->s3->server_opaque_prf_input_len > 0)
+ {
+ /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
+ * So first verify that we really have a value from the server too. */
+
+ if (s->s3->server_opaque_prf_input == NULL)
+ {
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ }
+
+ /* Anytime the server *has* sent an opaque PRF input, we need to check
+ * that we have a client opaque PRF input of the same size. */
+ if (s->s3->client_opaque_prf_input == NULL ||
+ s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
+ {
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_ILLEGAL_PARAMETER;
+ }
+ }
+#endif
+
+ /* If we've requested certificate status and we wont get one
+ * tell the callback
+ */
+ if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
+ && s->ctx && s->ctx->tlsext_status_cb)
+ {
+ int r;
+ /* Set resp to NULL, resplen to -1 so callback knows
+ * there is no response.
+ */
+ if (s->tlsext_ocsp_resp)
+ {
+ OPENSSL_free(s->tlsext_ocsp_resp);
+ s->tlsext_ocsp_resp = NULL;
+ }
+ s->tlsext_ocsp_resplen = -1;
+ r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
+ if (r == 0)
+ {
+ al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ }
+ if (r < 0)
+ {
+ al = SSL_AD_INTERNAL_ERROR;
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ }
+ }
+
+ switch (ret)
+ {
+ case SSL_TLSEXT_ERR_ALERT_FATAL:
+ ssl3_send_alert(s,SSL3_AL_FATAL,al);
+ return -1;
+
+ case SSL_TLSEXT_ERR_ALERT_WARNING:
+ ssl3_send_alert(s,SSL3_AL_WARNING,al);
+ return 1;
+
+ case SSL_TLSEXT_ERR_NOACK:
+ s->servername_done=0;
+ default:
+ return 1;
+ }
+ }
+
+/* Since the server cache lookup is done early on in the processing of client
+ * hello and other operations depend on the result we need to handle any TLS
+ * session ticket extension at the same time.
+ */
+
+int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
+ const unsigned char *limit, SSL_SESSION **ret)
+ {
+ /* Point after session ID in client hello */
+ const unsigned char *p = session_id + len;
+ unsigned short i;
+
+ /* If tickets disabled behave as if no ticket present
+ * to permit stateful resumption.
+ */
+ if (SSL_get_options(s) & SSL_OP_NO_TICKET)
+ return 1;
+
+ if ((s->version <= SSL3_VERSION) || !limit)
+ return 1;
+ if (p >= limit)
+ return -1;
+ /* Skip past DTLS cookie */
+ if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
+ {
+ i = *(p++);
+ p+= i;
+ if (p >= limit)
+ return -1;
+ }
+ /* Skip past cipher list */
+ n2s(p, i);
+ p+= i;
+ if (p >= limit)
+ return -1;
+ /* Skip past compression algorithm list */
+ i = *(p++);
+ p += i;
+ if (p > limit)
+ return -1;
+ /* Now at start of extensions */
+ if ((p + 2) >= limit)
+ return 1;
+ n2s(p, i);
+ while ((p + 4) <= limit)
+ {
+ unsigned short type, size;
+ n2s(p, type);
+ n2s(p, size);
+ if (p + size > limit)
+ return 1;
+ if (type == TLSEXT_TYPE_session_ticket)
+ {
+ /* If tickets disabled indicate cache miss which will
+ * trigger a full handshake
+ */
+ if (SSL_get_options(s) & SSL_OP_NO_TICKET)
+ return 1;
+ /* If zero length note client will accept a ticket
+ * and indicate cache miss to trigger full handshake
+ */
+ if (size == 0)
+ {
+ s->tlsext_ticket_expected = 1;
+ return 0; /* Cache miss */
+ }
+ if (s->tls_session_secret_cb)
+ {
+ /* Indicate cache miss here and instead of
+ * generating the session from ticket now,
+ * trigger abbreviated handshake based on
+ * external mechanism to calculate the master
+ * secret later. */
+ return 0;
+ }
+ return tls_decrypt_ticket(s, p, size, session_id, len,
+ ret);
+ }
+ p += size;
+ }
+ return 1;
+ }
+
+static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
+ const unsigned char *sess_id, int sesslen,
+ SSL_SESSION **psess)
+ {
+ SSL_SESSION *sess;
+ unsigned char *sdec;
+ const unsigned char *p;
+ int slen, mlen, renew_ticket = 0;
+ unsigned char tick_hmac[EVP_MAX_MD_SIZE];
+ HMAC_CTX hctx;
+ EVP_CIPHER_CTX ctx;
+ SSL_CTX *tctx = s->initial_ctx;
+ /* Need at least keyname + iv + some encrypted data */
+ if (eticklen < 48)
+ goto tickerr;
+ /* Initialize session ticket encryption and HMAC contexts */
+ HMAC_CTX_init(&hctx);
+ EVP_CIPHER_CTX_init(&ctx);
+ if (tctx->tlsext_ticket_key_cb)
+ {
+ unsigned char *nctick = (unsigned char *)etick;
+ int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
+ &ctx, &hctx, 0);
+ if (rv < 0)
+ return -1;
+ if (rv == 0)
+ goto tickerr;
+ if (rv == 2)
+ renew_ticket = 1;
+ }
+ else
+ {
+ /* Check key name matches */
+ if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
+ goto tickerr;
+ HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
+ tlsext_tick_md(), NULL);
+ EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
+ tctx->tlsext_tick_aes_key, etick + 16);
+ }
+ /* Attempt to process session ticket, first conduct sanity and
+ * integrity checks on ticket.
+ */
+ mlen = HMAC_size(&hctx);
+ if (mlen < 0)
+ {
+ EVP_CIPHER_CTX_cleanup(&ctx);
+ return -1;
+ }
+ eticklen -= mlen;
+ /* Check HMAC of encrypted ticket */
+ HMAC_Update(&hctx, etick, eticklen);
+ HMAC_Final(&hctx, tick_hmac, NULL);
+ HMAC_CTX_cleanup(&hctx);
+ if (memcmp(tick_hmac, etick + eticklen, mlen))
+ goto tickerr;
+ /* Attempt to decrypt session data */
+ /* Move p after IV to start of encrypted ticket, update length */
+ p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
+ eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
+ sdec = OPENSSL_malloc(eticklen);
+ if (!sdec)
+ {
+ EVP_CIPHER_CTX_cleanup(&ctx);
+ return -1;
+ }
+ EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
+ if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
+ goto tickerr;
+ slen += mlen;
+ EVP_CIPHER_CTX_cleanup(&ctx);
+ p = sdec;
+
+ sess = d2i_SSL_SESSION(NULL, &p, slen);
+ OPENSSL_free(sdec);
+ if (sess)
+ {
+ /* The session ID if non-empty is used by some clients to
+ * detect that the ticket has been accepted. So we copy it to
+ * the session structure. If it is empty set length to zero
+ * as required by standard.
+ */
+ if (sesslen)
+ memcpy(sess->session_id, sess_id, sesslen);
+ sess->session_id_length = sesslen;
+ *psess = sess;
+ s->tlsext_ticket_expected = renew_ticket;
+ return 1;
+ }
+ /* If session decrypt failure indicate a cache miss and set state to
+ * send a new ticket
+ */
+ tickerr:
+ s->tlsext_ticket_expected = 1;
+ return 0;
+ }
+
+/* Tables to translate from NIDs to TLS v1.2 ids */
+
+typedef struct
+ {
+ int nid;
+ int id;
+ } tls12_lookup;
+
+static tls12_lookup tls12_md[] = {
+#ifndef OPENSSL_NO_MD5
+ {NID_md5, TLSEXT_hash_md5},
+#endif
+#ifndef OPENSSL_NO_SHA
+ {NID_sha1, TLSEXT_hash_sha1},
+#endif
+#ifndef OPENSSL_NO_SHA256
+ {NID_sha224, TLSEXT_hash_sha224},
+ {NID_sha256, TLSEXT_hash_sha256},
+#endif
+#ifndef OPENSSL_NO_SHA512
+ {NID_sha384, TLSEXT_hash_sha384},
+ {NID_sha512, TLSEXT_hash_sha512}
+#endif
+};
+
+static tls12_lookup tls12_sig[] = {
+#ifndef OPENSSL_NO_RSA
+ {EVP_PKEY_RSA, TLSEXT_signature_rsa},
+#endif
+#ifndef OPENSSL_NO_RSA
+ {EVP_PKEY_DSA, TLSEXT_signature_dsa},
+#endif
+#ifndef OPENSSL_NO_ECDSA
+ {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
+#endif
+};
+
+static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
+ {
+ size_t i;
+ for (i = 0; i < tlen; i++)
+ {
+ if (table[i].nid == nid)
+ return table[i].id;
+ }
+ return -1;
+ }
+#if 0
+static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
+ {
+ size_t i;
+ for (i = 0; i < tlen; i++)
+ {
+ if (table[i].id == id)
+ return table[i].nid;
+ }
+ return -1;
+ }
+#endif
+
+int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
+ {
+ int sig_id, md_id;
+ md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
+ sizeof(tls12_md)/sizeof(tls12_lookup));
+ if (md_id == -1)
+ return 0;
+ sig_id = tls12_get_sigid(pk);
+ if (sig_id == -1)
+ return 0;
+ p[0] = (unsigned char)md_id;
+ p[1] = (unsigned char)sig_id;
+ return 1;
+ }
+
+int tls12_get_sigid(const EVP_PKEY *pk)
+ {
+ return tls12_find_id(pk->type, tls12_sig,
+ sizeof(tls12_sig)/sizeof(tls12_lookup));
+ }
+
+const EVP_MD *tls12_get_hash(unsigned char hash_alg)
+ {
+ switch(hash_alg)
+ {
+#ifndef OPENSSL_NO_MD5
+ case TLSEXT_hash_md5:
+#ifdef OPENSSL_FIPS
+ if (FIPS_mode())
+ return NULL;
+#endif
+ return EVP_md5();
+#endif
+#ifndef OPENSSL_NO_SHA
+ case TLSEXT_hash_sha1:
+ return EVP_sha1();
+#endif
+#ifndef OPENSSL_NO_SHA256
+ case TLSEXT_hash_sha224:
+ return EVP_sha224();
+
+ case TLSEXT_hash_sha256:
+ return EVP_sha256();
+#endif
+#ifndef OPENSSL_NO_SHA512
+ case TLSEXT_hash_sha384:
+ return EVP_sha384();
+
+ case TLSEXT_hash_sha512:
+ return EVP_sha512();
+#endif
+ default:
+ return NULL;
+
+ }
+ }
+
+/* Set preferred digest for each key type */
+
+int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
+ {
+ int i, idx;
+ const EVP_MD *md;
+ CERT *c = s->cert;
+ /* Extension ignored for TLS versions below 1.2 */
+ if (TLS1_get_version(s) < TLS1_2_VERSION)
+ return 1;
+ /* Should never happen */
+ if (!c)
+ return 0;
+
+ c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
+ c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
+ c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
+ c->pkeys[SSL_PKEY_ECC].digest = NULL;
+
+ for (i = 0; i < dsize; i += 2)
+ {
+ unsigned char hash_alg = data[i], sig_alg = data[i+1];
+
+ switch(sig_alg)
+ {
+#ifndef OPENSSL_NO_RSA
+ case TLSEXT_signature_rsa:
+ idx = SSL_PKEY_RSA_SIGN;
+ break;
+#endif
+#ifndef OPENSSL_NO_DSA
+ case TLSEXT_signature_dsa:
+ idx = SSL_PKEY_DSA_SIGN;
+ break;
+#endif
+#ifndef OPENSSL_NO_ECDSA
+ case TLSEXT_signature_ecdsa:
+ idx = SSL_PKEY_ECC;
+ break;
+#endif
+ default:
+ continue;
+ }
+
+ if (c->pkeys[idx].digest == NULL)
+ {
+ md = tls12_get_hash(hash_alg);
+ if (md)
+ {
+ c->pkeys[idx].digest = md;
+ if (idx == SSL_PKEY_RSA_SIGN)
+ c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
+ }
+ }
+
+ }
+
+
+ /* Set any remaining keys to default values. NOTE: if alg is not
+ * supported it stays as NULL.
+ */
+#ifndef OPENSSL_NO_DSA
+ if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
+ c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_dss1();
+#endif
+#ifndef OPENSSL_NO_RSA
+ if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
+ {
+ c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
+ c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
+ }
+#endif
+#ifndef OPENSSL_NO_ECDSA
+ if (!c->pkeys[SSL_PKEY_ECC].digest)
+ c->pkeys[SSL_PKEY_ECC].digest = EVP_ecdsa();
+#endif
+ return 1;
+ }
+