extensions_clnt.c 47.5 KB
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/*
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 * Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.
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 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <assert.h>
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#include <openssl/ocsp.h>
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#include "../ssl_locl.h"
#include "statem_locl.h"

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EXT_RETURN tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt,
                                          unsigned int context, X509 *x,
                                          size_t chainidx, int *al)
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{
    /* Add RI if renegotiating */
    if (!s->renegotiate)
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        return EXT_RETURN_NOT_SENT;
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    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_sub_memcpy_u8(pkt, s->s3->previous_client_finished,
                               s->s3->previous_client_finished_len)
            || !WPACKET_close(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_RENEGOTIATE, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}

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EXT_RETURN tls_construct_ctos_server_name(SSL *s, WPACKET *pkt,
                                          unsigned int context, X509 *x,
                                          size_t chainidx, int *al)
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{
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    if (s->ext.hostname == NULL)
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        return EXT_RETURN_NOT_SENT;
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    /* Add TLS extension servername to the Client Hello message */
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
               /* Sub-packet for server_name extension */
            || !WPACKET_start_sub_packet_u16(pkt)
               /* Sub-packet for servername list (always 1 hostname)*/
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_put_bytes_u8(pkt, TLSEXT_NAMETYPE_host_name)
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            || !WPACKET_sub_memcpy_u16(pkt, s->ext.hostname,
                                       strlen(s->ext.hostname))
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            || !WPACKET_close(pkt)
            || !WPACKET_close(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SERVER_NAME, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}

#ifndef OPENSSL_NO_SRP
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EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context,
                                  X509 *x, size_t chainidx, int *al)
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{
    /* Add SRP username if there is one */
    if (s->srp_ctx.login == NULL)
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        return EXT_RETURN_NOT_SENT;
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    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_srp)
               /* Sub-packet for SRP extension */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_start_sub_packet_u8(pkt)
               /* login must not be zero...internal error if so */
            || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
            || !WPACKET_memcpy(pkt, s->srp_ctx.login,
                               strlen(s->srp_ctx.login))
            || !WPACKET_close(pkt)
            || !WPACKET_close(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SRP, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}
#endif

#ifndef OPENSSL_NO_EC
static int use_ecc(SSL *s)
{
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    int i, end;
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    unsigned long alg_k, alg_a;
    STACK_OF(SSL_CIPHER) *cipher_stack = NULL;

    /* See if we support any ECC ciphersuites */
    if (s->version == SSL3_VERSION)
        return 0;

    cipher_stack = SSL_get_ciphers(s);
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    end = sk_SSL_CIPHER_num(cipher_stack);
    for (i = 0; i < end; i++) {
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        const SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);

        alg_k = c->algorithm_mkey;
        alg_a = c->algorithm_auth;
        if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK))
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                || (alg_a & SSL_aECDSA)
                || c->min_tls >= TLS1_3_VERSION)
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            return 1;
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    }

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    return 0;
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}

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EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt,
                                            unsigned int context, X509 *x,
                                            size_t chainidx, int *al)
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{
    const unsigned char *pformats;
    size_t num_formats;

    if (!use_ecc(s))
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        return EXT_RETURN_NOT_SENT;
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    /* Add TLS extension ECPointFormats to the ClientHello message */
    tls1_get_formatlist(s, &pformats, &num_formats);

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
               /* Sub-packet for formats extension */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats)
            || !WPACKET_close(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}

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EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
                                               unsigned int context, X509 *x,
                                               size_t chainidx, int *al)
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{
    const unsigned char *pcurves = NULL, *pcurvestmp;
    size_t num_curves = 0, i;

    if (!use_ecc(s))
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        return EXT_RETURN_NOT_SENT;
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    /*
     * Add TLS extension supported_groups to the ClientHello message
     */
    /* TODO(TLS1.3): Add support for DHE groups */
    if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
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               ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }
    pcurvestmp = pcurves;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
               /* Sub-packet for supported_groups extension */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_start_sub_packet_u16(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
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               ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }
    /* Copy curve ID if supported */
    for (i = 0; i < num_curves; i++, pcurvestmp += 2) {
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        if (tls_curve_allowed(s, pcurvestmp, SSL_SECOP_CURVE_SUPPORTED)) {
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            if (!WPACKET_put_bytes_u8(pkt, pcurvestmp[0])
                || !WPACKET_put_bytes_u8(pkt, pcurvestmp[1])) {
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                    SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
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                           ERR_R_INTERNAL_ERROR);
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                    return EXT_RETURN_FAIL;
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                }
        }
    }
    if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
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               ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}
#endif

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EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
                                             unsigned int context, X509 *x,
                                             size_t chainidx, int *al)
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{
    size_t ticklen;

    if (!tls_use_ticket(s))
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        return EXT_RETURN_NOT_SENT;
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    if (!s->new_session && s->session != NULL
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            && s->session->ext.tick != NULL
            && s->session->ssl_version != TLS1_3_VERSION) {
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        ticklen = s->session->ext.ticklen;
    } else if (s->session && s->ext.session_ticket != NULL
               && s->ext.session_ticket->data != NULL) {
        ticklen = s->ext.session_ticket->length;
        s->session->ext.tick = OPENSSL_malloc(ticklen);
        if (s->session->ext.tick == NULL) {
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            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET,
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                   ERR_R_INTERNAL_ERROR);
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            return EXT_RETURN_FAIL;
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        }
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        memcpy(s->session->ext.tick,
               s->ext.session_ticket->data, ticklen);
        s->session->ext.ticklen = ticklen;
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    } else {
        ticklen = 0;
    }

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    if (ticklen == 0 && s->ext.session_ticket != NULL &&
            s->ext.session_ticket->data == NULL)
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        return EXT_RETURN_NOT_SENT;
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    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
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            || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick, ticklen)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}

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EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
                                       unsigned int context, X509 *x,
                                       size_t chainidx, int *al)
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{
    size_t salglen;
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    const uint16_t *salg;
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    if (!SSL_CLIENT_USE_SIGALGS(s))
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        return EXT_RETURN_NOT_SENT;
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    salglen = tls12_get_psigalgs(s, 1, &salg);
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    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
               /* Sub-packet for sig-algs extension */
            || !WPACKET_start_sub_packet_u16(pkt)
               /* Sub-packet for the actual list */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !tls12_copy_sigalgs(s, pkt, salg, salglen)
            || !WPACKET_close(pkt)
            || !WPACKET_close(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}

#ifndef OPENSSL_NO_OCSP
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EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
                                             unsigned int context, X509 *x,
                                             size_t chainidx, int *al)
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{
    int i;

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    /* This extension isn't defined for client Certificates */
    if (x != NULL)
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        return EXT_RETURN_NOT_SENT;
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    if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp)
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        return EXT_RETURN_NOT_SENT;
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    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
               /* Sub-packet for status request extension */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp)
               /* Sub-packet for the ids */
            || !WPACKET_start_sub_packet_u16(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }
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    for (i = 0; i < sk_OCSP_RESPID_num(s->ext.ocsp.ids); i++) {
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        unsigned char *idbytes;
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        OCSP_RESPID *id = sk_OCSP_RESPID_value(s->ext.ocsp.ids, i);
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        int idlen = i2d_OCSP_RESPID(id, NULL);
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        if (idlen <= 0
                   /* Sub-packet for an individual id */
                || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes)
                || i2d_OCSP_RESPID(id, &idbytes) != idlen) {
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            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
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                   ERR_R_INTERNAL_ERROR);
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            return EXT_RETURN_FAIL;
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        }
    }
    if (!WPACKET_close(pkt)
            || !WPACKET_start_sub_packet_u16(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }
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    if (s->ext.ocsp.exts) {
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        unsigned char *extbytes;
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        int extlen = i2d_X509_EXTENSIONS(s->ext.ocsp.exts, NULL);
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        if (extlen < 0) {
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            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
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                   ERR_R_INTERNAL_ERROR);
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            return EXT_RETURN_FAIL;
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        }
        if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes)
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                || i2d_X509_EXTENSIONS(s->ext.ocsp.exts, &extbytes)
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                   != extlen) {
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            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST,
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                   ERR_R_INTERNAL_ERROR);
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            return EXT_RETURN_FAIL;
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       }
    }
    if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}
#endif

#ifndef OPENSSL_NO_NEXTPROTONEG
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EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
                                  X509 *x, size_t chainidx, int *al)
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{
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    if (s->ctx->ext.npn_select_cb == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
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        return EXT_RETURN_NOT_SENT;
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    /*
     * The client advertises an empty extension to indicate its support
     * for Next Protocol Negotiation
     */
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
            || !WPACKET_put_bytes_u16(pkt, 0)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_NPN, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}
#endif

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EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
                                   X509 *x, size_t chainidx, int *al)
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{
    s->s3->alpn_sent = 0;

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    if (s->ext.alpn == NULL || !SSL_IS_FIRST_HANDSHAKE(s))
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        return EXT_RETURN_NOT_SENT;
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    if (!WPACKET_put_bytes_u16(pkt,
                TLSEXT_TYPE_application_layer_protocol_negotiation)
               /* Sub-packet ALPN extension */
            || !WPACKET_start_sub_packet_u16(pkt)
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            || !WPACKET_sub_memcpy_u16(pkt, s->ext.alpn, s->ext.alpn_len)
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            || !WPACKET_close(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ALPN, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }
    s->s3->alpn_sent = 1;

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    return EXT_RETURN_SENT;
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}


#ifndef OPENSSL_NO_SRTP
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EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt,
                                       unsigned int context, X509 *x,
                                       size_t chainidx, int *al)
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{
    STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s);
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    int i, end;
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    if (clnt == NULL)
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        return EXT_RETURN_NOT_SENT;
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    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
               /* Sub-packet for SRTP extension */
            || !WPACKET_start_sub_packet_u16(pkt)
               /* Sub-packet for the protection profile list */
            || !WPACKET_start_sub_packet_u16(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }
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    end = sk_SRTP_PROTECTION_PROFILE_num(clnt);
    for (i = 0; i < end; i++) {
        const SRTP_PROTECTION_PROFILE *prof =
            sk_SRTP_PROTECTION_PROFILE_value(clnt, i);

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        if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) {
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            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
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            return EXT_RETURN_FAIL;
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        }
    }
    if (!WPACKET_close(pkt)
               /* Add an empty use_mki value */
            || !WPACKET_put_bytes_u8(pkt, 0)
            || !WPACKET_close(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}
#endif

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EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
                                  X509 *x, size_t chainidx, int *al)
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{
    if (s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
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        return EXT_RETURN_NOT_SENT;
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    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
            || !WPACKET_put_bytes_u16(pkt, 0)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ETM, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}

#ifndef OPENSSL_NO_CT
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EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
                                  X509 *x, size_t chainidx, int *al)
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{
    if (s->ct_validation_callback == NULL)
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        return EXT_RETURN_NOT_SENT;
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    /* Not defined for client Certificates */
    if (x != NULL)
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        return EXT_RETURN_NOT_SENT;
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    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp)
            || !WPACKET_put_bytes_u16(pkt, 0)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SCT, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}
#endif

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EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
                                  X509 *x, size_t chainidx, int *al)
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{
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
            || !WPACKET_put_bytes_u16(pkt, 0)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EMS, ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    return EXT_RETURN_SENT;
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}

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EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
                                                 unsigned int context, X509 *x,
                                                 size_t chainidx, int *al)
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{
    int currv, min_version, max_version, reason;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_start_sub_packet_u8(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
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               ERR_R_INTERNAL_ERROR);
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        return EXT_RETURN_FAIL;
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    }

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    reason = ssl_get_min_max_version(s, &min_version, &max_version);
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    if (reason != 0) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, reason);
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        return EXT_RETURN_FAIL;
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    }

    /*
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     * TODO(TLS1.3): There is some discussion on the TLS list as to whether
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     * we should include versions <TLS1.2. For the moment we do. To be
     * reviewed later.
     */
    for (currv = max_version; currv >= min_version; currv--) {
        /* TODO(TLS1.3): Remove this first if clause prior to release!! */
        if (currv == TLS1_3_VERSION) {
            if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) {
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                SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
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                       ERR_R_INTERNAL_ERROR);
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                return EXT_RETURN_FAIL;
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            }
        } else if (!WPACKET_put_bytes_u16(pkt, currv)) {
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            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
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                   ERR_R_INTERNAL_ERROR);
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            return EXT_RETURN_FAIL;
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        }
    }
    if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
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        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS,
499
               ERR_R_INTERNAL_ERROR);
500
        return EXT_RETURN_FAIL;
501 502
    }

503
    return EXT_RETURN_SENT;
504 505
}

506 507 508 509
/*
 * Construct a psk_kex_modes extension. We only have two modes we know about
 * at this stage, so we send both.
 */
510 511 512
EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
                                            unsigned int context, X509 *x,
                                            size_t chainidx, int *al)
513 514 515 516 517 518 519 520 521 522 523 524 525 526
{
#ifndef OPENSSL_NO_TLS1_3
    /*
     * TODO(TLS1.3): Do we want this list to be configurable? For now we always
     * just send both supported modes
     */
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk_kex_modes)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_start_sub_packet_u8(pkt)
            || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE_DHE)
            || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE)
            || !WPACKET_close(pkt)
            || !WPACKET_close(pkt)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES, ERR_R_INTERNAL_ERROR);
527
        return EXT_RETURN_FAIL;
528
    }
529 530

    s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_KE | TLSEXT_KEX_MODE_FLAG_KE_DHE;
531 532
#endif

533
    return EXT_RETURN_SENT;
534 535
}

536 537 538
#ifndef OPENSSL_NO_TLS1_3
static int add_key_share(SSL *s, WPACKET *pkt, unsigned int curve_id)
{
M
Matt Caswell 已提交
539 540
    unsigned char *encoded_point = NULL;
    EVP_PKEY *key_share_key = NULL;
541 542
    size_t encodedlen;

M
Matt Caswell 已提交
543 544 545 546
    if (s->s3->tmp.pkey != NULL) {
        assert(s->hello_retry_request);
        if (!s->hello_retry_request) {
            SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_INTERNAL_ERROR);
547
            return EXT_RETURN_FAIL;
M
Matt Caswell 已提交
548 549 550 551 552 553 554 555 556
        }
        /*
         * Could happen if we got an HRR that wasn't requesting a new key_share
         */
        key_share_key = s->s3->tmp.pkey;
    } else {
        key_share_key = ssl_generate_pkey_curve(curve_id);
        if (key_share_key == NULL) {
            SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EVP_LIB);
557
            return EXT_RETURN_FAIL;
M
Matt Caswell 已提交
558
        }
559 560 561 562
    }

    /* Encode the public key. */
    encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
563
                                                &encoded_point);
564 565
    if (encodedlen == 0) {
        SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EC_LIB);
M
Matt Caswell 已提交
566
        goto err;
567 568 569 570
    }

    /* Create KeyShareEntry */
    if (!WPACKET_put_bytes_u16(pkt, curve_id)
571
            || !WPACKET_sub_memcpy_u16(pkt, encoded_point, encodedlen)) {
572
        SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_INTERNAL_ERROR);
M
Matt Caswell 已提交
573
        goto err;
574 575 576 577 578 579 580 581 582
    }

    /*
     * TODO(TLS1.3): When changing to send more than one key_share we're
     * going to need to be able to save more than one EVP_PKEY. For now
     * we reuse the existing tmp.pkey
     */
    s->s3->tmp.pkey = key_share_key;
    s->s3->group_id = curve_id;
583
    OPENSSL_free(encoded_point);
584

585
    return EXT_RETURN_SENT;
M
Matt Caswell 已提交
586 587 588 589
 err:
    if (s->s3->tmp.pkey == NULL)
        EVP_PKEY_free(key_share_key);
    OPENSSL_free(encoded_point);
590
    return EXT_RETURN_FAIL;
591 592 593
}
#endif

594 595 596
EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
                                        unsigned int context, X509 *x,
                                        size_t chainidx, int *al)
597
{
M
Matt Caswell 已提交
598
#ifndef OPENSSL_NO_TLS1_3
599
    size_t i, num_curves = 0;
600
    const unsigned char *pcurves = NULL;
601
    unsigned int curve_id = 0;
602 603 604 605 606 607 608

    /* key_share extension */
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
               /* Extension data sub-packet */
            || !WPACKET_start_sub_packet_u16(pkt)
               /* KeyShare list sub-packet */
            || !WPACKET_start_sub_packet_u16(pkt)) {
M
Matt Caswell 已提交
609
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
610
        return EXT_RETURN_FAIL;
611 612 613
    }

    if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
M
Matt Caswell 已提交
614
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
615
        return EXT_RETURN_FAIL;
616 617 618 619 620 621
    }

    /*
     * TODO(TLS1.3): Make the number of key_shares sent configurable. For
     * now, just send one
     */
622 623 624 625
    if (s->s3->group_id != 0) {
        curve_id = s->s3->group_id;
    } else {
        for (i = 0; i < num_curves; i++, pcurves += 2) {
626

627 628
            if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
                continue;
629

M
Matt Caswell 已提交
630
            curve_id = bytestogroup(pcurves);
631
            break;
632
        }
633
    }
634

635 636
    if (curve_id == 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE);
637
        return EXT_RETURN_FAIL;
638 639
    }

640
    if (!add_key_share(s, pkt, curve_id))
641
        return EXT_RETURN_FAIL;
642

643
    if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
M
Matt Caswell 已提交
644
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
645
        return EXT_RETURN_FAIL;
646
    }
M
Matt Caswell 已提交
647
#endif
648

649
    return EXT_RETURN_SENT;
650 651
}

652 653
EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
                                     X509 *x, size_t chainidx, int *al)
M
Matt Caswell 已提交
654
{
655
    EXT_RETURN ret = EXT_RETURN_FAIL;
M
Matt Caswell 已提交
656 657 658

    /* Should only be set if we've had an HRR */
    if (s->ext.tls13_cookie_len == 0)
659
        return EXT_RETURN_NOT_SENT;
M
Matt Caswell 已提交
660 661 662 663 664 665 666 667 668 669 670

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_cookie)
               /* Extension data sub-packet */
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_sub_memcpy_u16(pkt, s->ext.tls13_cookie,
                                       s->ext.tls13_cookie_len)
            || !WPACKET_close(pkt)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_COOKIE, ERR_R_INTERNAL_ERROR);
        goto end;
    }

671
    ret = EXT_RETURN_SENT;
M
Matt Caswell 已提交
672 673
 end:
    OPENSSL_free(s->ext.tls13_cookie);
674
    s->ext.tls13_cookie = NULL;
M
Matt Caswell 已提交
675 676 677 678 679
    s->ext.tls13_cookie_len = 0;

    return ret;
}

680 681 682
EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
                                         unsigned int context, X509 *x,
                                         size_t chainidx, int *al)
683 684 685 686
{
    if (s->early_data_state != SSL_EARLY_DATA_CONNECTING
            || s->session->ext.max_early_data == 0) {
        s->max_early_data = 0;
687
        return EXT_RETURN_NOT_SENT;
688 689 690 691 692 693 694
    }
    s->max_early_data = s->session->ext.max_early_data;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_close(pkt)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
695
        return EXT_RETURN_FAIL;
696 697 698 699 700 701 702 703
    }

    /*
     * We set this to rejected here. Later, if the server acknowledges the
     * extension, we set it to accepted.
     */
    s->ext.early_data = SSL_EARLY_DATA_REJECTED;

704
    return EXT_RETURN_SENT;
705 706
}

707 708 709
#define F5_WORKAROUND_MIN_MSG_LEN   0xff
#define F5_WORKAROUND_MAX_MSG_LEN   0x200

M
Matt Caswell 已提交
710 711 712 713 714 715 716 717 718 719 720 721 722 723
/*
 * PSK pre binder overhead =
 *  2 bytes for TLSEXT_TYPE_psk
 *  2 bytes for extension length
 *  2 bytes for identities list length
 *  2 bytes for identity length
 *  4 bytes for obfuscated_ticket_age
 *  2 bytes for binder list length
 *  1 byte for binder length
 * The above excludes the number of bytes for the identity itself and the
 * subsequent binder bytes
 */
#define PSK_PRE_BINDER_OVERHEAD (2 + 2 + 2 + 2 + 4 + 2 + 1)

724 725 726
EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
                                      unsigned int context, X509 *x,
                                      size_t chainidx, int *al)
727 728 729 730 731
{
    unsigned char *padbytes;
    size_t hlen;

    if ((s->options & SSL_OP_TLSEXT_PADDING) == 0)
732
        return EXT_RETURN_NOT_SENT;
733 734

    /*
M
Matt Caswell 已提交
735 736 737 738
     * Add padding to workaround bugs in F5 terminators. See RFC7685.
     * This code calculates the length of all extensions added so far but
     * excludes the PSK extension (because that MUST be written last). Therefore
     * this extension MUST always appear second to last.
739 740
     */
    if (!WPACKET_get_total_written(pkt, &hlen)) {
M
Matt Caswell 已提交
741
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
742
        return EXT_RETURN_FAIL;
743 744
    }

M
Matt Caswell 已提交
745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
    /*
     * If we're going to send a PSK then that will be written out after this
     * extension, so we need to calculate how long it is going to be.
     */
    if (s->session->ssl_version == TLS1_3_VERSION
            && s->session->ext.ticklen != 0
            && s->session->cipher != NULL) {
        const EVP_MD *md = ssl_md(s->session->cipher->algorithm2);

        if (md != NULL) {
            /*
             * Add the fixed PSK overhead, the identity length and the binder
             * length.
             */
            hlen +=  PSK_PRE_BINDER_OVERHEAD + s->session->ext.ticklen
                     + EVP_MD_size(md);
        }
    }

764
    if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
F
FdaSilvaYY 已提交
765
        /* Calculate the amount of padding we need to add */
766 767 768 769 770 771
        hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;

        /*
         * Take off the size of extension header itself (2 bytes for type and
         * 2 bytes for length bytes)
         */
772 773 774 775 776 777 778
        if (hlen >= 4)
            hlen -= 4;
        else
            hlen = 0;

        if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
                || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
M
Matt Caswell 已提交
779
            SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
780 781 782 783 784
            return 0;
        }
        memset(padbytes, 0, hlen);
    }

785
    return EXT_RETURN_SENT;
786 787
}

788 789 790
/*
 * Construct the pre_shared_key extension
 */
791 792
EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
                                  X509 *x, size_t chainidx, int *al)
793 794
{
#ifndef OPENSSL_NO_TLS1_3
795
    uint32_t now, agesec, agems;
796
    size_t hashsize, binderoffset, msglen;
797 798
    unsigned char *binder = NULL, *msgstart = NULL;
    const EVP_MD *md;
799
    EXT_RETURN ret = EXT_RETURN_FAIL;
800 801 802

    s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;

M
Matt Caswell 已提交
803 804 805 806 807 808
    /*
     * Note: At this stage of the code we only support adding a single
     * resumption PSK. If we add support for multiple PSKs then the length
     * calculations in the padding extension will need to be adjusted.
     */

809
    /*
810 811
     * If this is an incompatible or new session then we have nothing to resume
     * so don't add this extension.
812
     */
813 814
    if (s->session->ssl_version != TLS1_3_VERSION
            || s->session->ext.ticklen == 0)
815
        return EXT_RETURN_NOT_SENT;
816

817 818 819 820 821
    if (s->session->cipher == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
        goto err;
    }

822 823
    md = ssl_md(s->session->cipher->algorithm2);
    if (md == NULL) {
F
FdaSilvaYY 已提交
824
        /* Don't recognize this cipher so we can't use the session. Ignore it */
825
        return EXT_RETURN_NOT_SENT;
826 827
    }

828 829 830 831 832
    if (s->hello_retry_request && md != ssl_handshake_md(s)) {
        /*
         * Selected ciphersuite hash does not match the hash for the session so
         * we can't use it.
         */
833
        return EXT_RETURN_NOT_SENT;
834 835
    }

836 837 838 839 840 841 842 843
    /*
     * Technically the C standard just says time() returns a time_t and says
     * nothing about the encoding of that type. In practice most implementations
     * follow POSIX which holds it as an integral type in seconds since epoch.
     * We've already made the assumption that we can do this in multiple places
     * in the code, so portability shouldn't be an issue.
     */
    now = (uint32_t)time(NULL);
844
    agesec = now - (uint32_t)s->session->time;
845

846
    if (s->session->ext.tick_lifetime_hint < agesec) {
M
Matt Caswell 已提交
847
        /* Ticket is too old. Ignore it. */
848
        return EXT_RETURN_NOT_SENT;
M
Matt Caswell 已提交
849 850
    }

851 852 853 854
    /*
     * Calculate age in ms. We're just doing it to nearest second. Should be
     * good enough.
     */
855
    agems = agesec * (uint32_t)1000;
856

857
    if (agesec != 0 && agems / (uint32_t)1000 != agesec) {
858 859 860 861
        /*
         * Overflow. Shouldn't happen unless this is a *really* old session. If
         * so we just ignore it.
         */
862
        return EXT_RETURN_NOT_SENT;
863 864
    }

M
Matt Caswell 已提交
865 866 867 868 869
    /*
     * Obfuscate the age. Overflow here is fine, this addition is supposed to
     * be mod 2^32.
     */
    agems += s->session->ext.tick_age_add;
870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897

    hashsize = EVP_MD_size(md);

    /* Create the extension, but skip over the binder for now */
    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick,
                                       s->session->ext.ticklen)
            || !WPACKET_put_bytes_u32(pkt, agems)
            || !WPACKET_close(pkt)
            || !WPACKET_get_total_written(pkt, &binderoffset)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_sub_allocate_bytes_u8(pkt, hashsize, &binder)
            || !WPACKET_close(pkt)
            || !WPACKET_close(pkt)
            || !WPACKET_get_total_written(pkt, &msglen)
               /*
                * We need to fill in all the sub-packet lengths now so we can
                * calculate the HMAC of the message up to the binders
                */
            || !WPACKET_fill_lengths(pkt)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    msgstart = WPACKET_get_curr(pkt) - msglen;

898 899
    if (tls_psk_do_binder(s, md, msgstart, binderoffset, NULL, binder,
                          s->session, 1) != 1) {
900 901 902 903 904 905
        SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    s->session->ext.tick_identity = 0;

906
    ret = EXT_RETURN_SENT;
907 908 909 910 911 912 913
 err:
    return ret;
#else
    return 1;
#endif
}

914 915 916
/*
 * Parse the server's renegotiation binding and abort if it's not right
 */
917 918
int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
                               X509 *x, size_t chainidx, int *al)
919 920 921 922 923 924 925 926 927 928 929 930
{
    size_t expected_len = s->s3->previous_client_finished_len
        + s->s3->previous_server_finished_len;
    size_t ilen;
    const unsigned char *data;

    /* Check for logic errors */
    assert(expected_len == 0 || s->s3->previous_client_finished_len != 0);
    assert(expected_len == 0 || s->s3->previous_server_finished_len != 0);

    /* Parse the length byte */
    if (!PACKET_get_1_len(pkt, &ilen)) {
M
Matt Caswell 已提交
931
        SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
932 933 934 935 936 937 938
               SSL_R_RENEGOTIATION_ENCODING_ERR);
        *al = SSL_AD_ILLEGAL_PARAMETER;
        return 0;
    }

    /* Consistency check */
    if (PACKET_remaining(pkt) != ilen) {
M
Matt Caswell 已提交
939
        SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
940 941 942 943 944 945 946
               SSL_R_RENEGOTIATION_ENCODING_ERR);
        *al = SSL_AD_ILLEGAL_PARAMETER;
        return 0;
    }

    /* Check that the extension matches */
    if (ilen != expected_len) {
M
Matt Caswell 已提交
947
        SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
948 949 950 951 952 953 954 955
               SSL_R_RENEGOTIATION_MISMATCH);
        *al = SSL_AD_HANDSHAKE_FAILURE;
        return 0;
    }

    if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len)
        || memcmp(data, s->s3->previous_client_finished,
                  s->s3->previous_client_finished_len) != 0) {
M
Matt Caswell 已提交
956
        SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
957 958 959 960 961 962 963 964
               SSL_R_RENEGOTIATION_MISMATCH);
        *al = SSL_AD_HANDSHAKE_FAILURE;
        return 0;
    }

    if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len)
        || memcmp(data, s->s3->previous_server_finished,
                  s->s3->previous_server_finished_len) != 0) {
M
Matt Caswell 已提交
965
        SSLerr(SSL_F_TLS_PARSE_STOC_RENEGOTIATE,
966 967 968 969 970 971 972 973 974
               SSL_R_RENEGOTIATION_MISMATCH);
        *al = SSL_AD_ILLEGAL_PARAMETER;
        return 0;
    }
    s->s3->send_connection_binding = 1;

    return 1;
}

975 976
int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
                               X509 *x, size_t chainidx, int *al)
977
{
R
Rich Salz 已提交
978
    if (s->ext.hostname == NULL || PACKET_remaining(pkt) > 0) {
979 980 981 982 983
        *al = SSL_AD_UNRECOGNIZED_NAME;
        return 0;
    }

    if (!s->hit) {
R
Rich Salz 已提交
984
        if (s->session->ext.hostname != NULL) {
985 986 987
            *al = SSL_AD_INTERNAL_ERROR;
            return 0;
        }
R
Rich Salz 已提交
988 989
        s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
        if (s->session->ext.hostname == NULL) {
990 991 992 993 994 995 996 997 998
            *al = SSL_AD_INTERNAL_ERROR;
            return 0;
        }
    }

    return 1;
}

#ifndef OPENSSL_NO_EC
999 1000
int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
                                 X509 *x, size_t chainidx, int *al)
1001
{
R
Rich Salz 已提交
1002
    unsigned int ecpointformats_len;
1003 1004 1005 1006 1007 1008 1009
    PACKET ecptformatlist;

    if (!PACKET_as_length_prefixed_1(pkt, &ecptformatlist)) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }
    if (!s->hit) {
R
Rich Salz 已提交
1010 1011
        ecpointformats_len = PACKET_remaining(&ecptformatlist);
        s->session->ext.ecpointformats_len = 0;
1012

R
Rich Salz 已提交
1013 1014 1015
        OPENSSL_free(s->session->ext.ecpointformats);
        s->session->ext.ecpointformats = OPENSSL_malloc(ecpointformats_len);
        if (s->session->ext.ecpointformats == NULL) {
1016 1017 1018 1019
            *al = SSL_AD_INTERNAL_ERROR;
            return 0;
        }

R
Rich Salz 已提交
1020
        s->session->ext.ecpointformats_len = ecpointformats_len;
1021 1022

        if (!PACKET_copy_bytes(&ecptformatlist,
R
Rich Salz 已提交
1023 1024
                               s->session->ext.ecpointformats,
                               ecpointformats_len)) {
1025 1026 1027 1028 1029 1030 1031 1032 1033
            *al = SSL_AD_INTERNAL_ERROR;
            return 0;
        }
    }

    return 1;
}
#endif

1034 1035
int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
                                  X509 *x, size_t chainidx, int *al)
1036
{
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    if (s->ext.session_ticket_cb != NULL &&
        !s->ext.session_ticket_cb(s, PACKET_data(pkt),
                              PACKET_remaining(pkt),
                              s->ext.session_ticket_cb_arg)) {
1041 1042 1043
        *al = SSL_AD_INTERNAL_ERROR;
        return 0;
    }
1044

1045 1046 1047 1048
    if (!tls_use_ticket(s) || PACKET_remaining(pkt) > 0) {
        *al = SSL_AD_UNSUPPORTED_EXTENSION;
        return 0;
    }
1049

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    s->ext.ticket_expected = 1;
1051 1052 1053 1054

    return 1;
}

1055
#ifndef OPENSSL_NO_OCSP
1056 1057
int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
                                  X509 *x, size_t chainidx, int *al)
1058 1059
{
    /*
1060 1061
     * MUST only be sent if we've requested a status
     * request message. In TLS <= 1.2 it must also be empty.
1062
     */
1063
    if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp
1064
            || (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) > 0)) {
1065 1066 1067
        *al = SSL_AD_UNSUPPORTED_EXTENSION;
        return 0;
    }
1068 1069 1070

    if (SSL_IS_TLS13(s)) {
        /* We only know how to handle this if it's for the first Certificate in
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         * the chain. We ignore any other responses.
1072
         */
1073
        if (chainidx != 0)
1074 1075 1076 1077
            return 1;
        return tls_process_cert_status_body(s, pkt, al);
    }

1078
    /* Set flag to expect CertificateStatus message */
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    s->ext.status_expected = 1;
1080 1081 1082

    return 1;
}
1083
#endif
1084 1085 1086


#ifndef OPENSSL_NO_CT
1087 1088
int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
{
    /*
     * Only take it if we asked for it - i.e if there is no CT validation
     * callback set, then a custom extension MAY be processing it, so we
     * need to let control continue to flow to that.
     */
    if (s->ct_validation_callback != NULL) {
        size_t size = PACKET_remaining(pkt);

        /* Simply copy it off for later processing */
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        OPENSSL_free(s->ext.scts);
        s->ext.scts = NULL;
1101

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        s->ext.scts_len = size;
1103
        if (size > 0) {
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            s->ext.scts = OPENSSL_malloc(size);
            if (s->ext.scts == NULL
                    || !PACKET_copy_bytes(pkt, s->ext.scts, size)) {
1107 1108 1109 1110 1111
                *al = SSL_AD_INTERNAL_ERROR;
                return 0;
            }
        }
    } else {
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
        ENDPOINT role = (context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0
                        ? ENDPOINT_CLIENT : ENDPOINT_BOTH;

        /*
         * If we didn't ask for it then there must be a custom extension,
         * otherwise this is unsolicited.
         */
        if (custom_ext_find(&s->cert->custext, role,
                            TLSEXT_TYPE_signed_certificate_timestamp,
                            NULL) == NULL) {
            *al = TLS1_AD_UNSUPPORTED_EXTENSION;
            return 0;
        }

1126 1127 1128 1129
        if (custom_ext_parse(s, context,
                             TLSEXT_TYPE_signed_certificate_timestamp,
                             PACKET_data(pkt), PACKET_remaining(pkt),
                             x, chainidx, al) <= 0)
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
            return 0;
    }

    return 1;
}
#endif


#ifndef OPENSSL_NO_NEXTPROTONEG
/*
 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
 * elements of zero length are allowed and the set of elements must exactly
 * fill the length of the block. Returns 1 on success or 0 on failure.
 */
static int ssl_next_proto_validate(PACKET *pkt)
{
    PACKET tmp_protocol;

    while (PACKET_remaining(pkt)) {
        if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
            || PACKET_remaining(&tmp_protocol) == 0)
            return 0;
    }

    return 1;
}

1157 1158
int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
1159 1160 1161 1162 1163
{
    unsigned char *selected;
    unsigned char selected_len;
    PACKET tmppkt;

1164
    /* Check if we are in a renegotiation. If so ignore this extension */
1165
    if (!SSL_IS_FIRST_HANDSHAKE(s))
1166 1167 1168
        return 1;

    /* We must have requested it. */
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    if (s->ctx->ext.npn_select_cb == NULL) {
1170 1171 1172
        *al = SSL_AD_UNSUPPORTED_EXTENSION;
        return 0;
    }
1173

1174 1175 1176 1177 1178 1179
    /* The data must be valid */
    tmppkt = *pkt;
    if (!ssl_next_proto_validate(&tmppkt)) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }
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    if (s->ctx->ext.npn_select_cb(s, &selected, &selected_len,
                                  PACKET_data(pkt),
                                  PACKET_remaining(pkt),
                                  s->ctx->ext.npn_select_cb_arg) !=
1184 1185 1186 1187
             SSL_TLSEXT_ERR_OK) {
        *al = SSL_AD_INTERNAL_ERROR;
        return 0;
    }
1188

1189 1190 1191 1192
    /*
     * Could be non-NULL if server has sent multiple NPN extensions in
     * a single Serverhello
     */
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1193 1194 1195
    OPENSSL_free(s->ext.npn);
    s->ext.npn = OPENSSL_malloc(selected_len);
    if (s->ext.npn == NULL) {
1196 1197 1198 1199
        *al = SSL_AD_INTERNAL_ERROR;
        return 0;
    }

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    memcpy(s->ext.npn, selected, selected_len);
    s->ext.npn_len = selected_len;
    s->s3->npn_seen = 1;
1203 1204 1205 1206 1207

    return 1;
}
#endif

1208 1209
int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                        size_t chainidx, int *al)
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245
{
    size_t len;

    /* We must have requested it. */
    if (!s->s3->alpn_sent) {
        *al = SSL_AD_UNSUPPORTED_EXTENSION;
        return 0;
    }
    /*-
     * The extension data consists of:
     *   uint16 list_length
     *   uint8 proto_length;
     *   uint8 proto[proto_length];
     */
    if (!PACKET_get_net_2_len(pkt, &len)
        || PACKET_remaining(pkt) != len || !PACKET_get_1_len(pkt, &len)
        || PACKET_remaining(pkt) != len) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }
    OPENSSL_free(s->s3->alpn_selected);
    s->s3->alpn_selected = OPENSSL_malloc(len);
    if (s->s3->alpn_selected == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
        return 0;
    }
    if (!PACKET_copy_bytes(pkt, s->s3->alpn_selected, len)) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }
    s->s3->alpn_selected_len = len;

    return 1;
}

#ifndef OPENSSL_NO_SRTP
1246 1247
int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                            size_t chainidx, int *al)
1248 1249 1250 1251 1252 1253
{
    unsigned int id, ct, mki;
    int i;
    STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
    SRTP_PROTECTION_PROFILE *prof;

1254 1255 1256 1257
    if (!PACKET_get_net_2(pkt, &ct) || ct != 2
            || !PACKET_get_net_2(pkt, &id)
            || !PACKET_get_1(pkt, &mki)
            || PACKET_remaining(pkt) != 0) {
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        SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1259 1260 1261 1262 1263 1264 1265
               SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    if (mki != 0) {
        /* Must be no MKI, since we never offer one */
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        SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_BAD_SRTP_MKI_VALUE);
1267 1268 1269 1270 1271
        *al = SSL_AD_ILLEGAL_PARAMETER;
        return 0;
    }

    /* Throw an error if the server gave us an unsolicited extension */
1272
    clnt = SSL_get_srtp_profiles(s);
1273
    if (clnt == NULL) {
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        SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP, SSL_R_NO_SRTP_PROFILES);
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    /*
     * Check to see if the server gave us something we support (and
     * presumably offered)
     */
    for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) {
        prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);

        if (prof->id == id) {
            s->srtp_profile = prof;
            *al = 0;
            return 1;
        }
    }

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    SSLerr(SSL_F_TLS_PARSE_STOC_USE_SRTP,
1294 1295 1296 1297 1298 1299
           SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
    *al = SSL_AD_DECODE_ERROR;
    return 0;
}
#endif

1300 1301
int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
1302 1303 1304 1305 1306
{
    /* Ignore if inappropriate ciphersuite */
    if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
            && s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
            && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
1307
        s->ext.use_etm = 1;
1308 1309 1310 1311

    return 1;
}

1312 1313
int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
1314 1315 1316 1317 1318 1319 1320 1321
{
    s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
    if (!s->hit)
        s->session->flags |= SSL_SESS_FLAG_EXTMS;

    return 1;
}

1322 1323
int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                             size_t chainidx, int *al)
1324
{
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#ifndef OPENSSL_NO_TLS1_3
1326 1327 1328 1329 1330
    unsigned int group_id;
    PACKET encoded_pt;
    EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;

    /* Sanity check */
1331
    if (ckey == NULL || s->s3->peer_tmp != NULL) {
1332
        *al = SSL_AD_INTERNAL_ERROR;
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1333
        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1334 1335 1336 1337
        return 0;
    }

    if (!PACKET_get_net_2(pkt, &group_id)) {
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        *al = SSL_AD_DECODE_ERROR;
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1339
        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1340 1341 1342
        return 0;
    }

1343
    if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) {
1344 1345 1346 1347
        unsigned const char *pcurves = NULL;
        size_t i, num_curves;

        if (PACKET_remaining(pkt) != 0) {
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            *al = SSL_AD_DECODE_ERROR;
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368
            SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
            return 0;
        }

        /*
         * It is an error if the HelloRetryRequest wants a key_share that we
         * already sent in the first ClientHello
         */
        if (group_id == s->s3->group_id) {
            *al = SSL_AD_ILLEGAL_PARAMETER;
            SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
            return 0;
        }

        /* Validate the selected group is one we support */
        if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
            SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
            return 0;
        }
        for (i = 0; i < num_curves; i++, pcurves += 2) {
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            if (group_id == bytestogroup(pcurves))
1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384
                break;
        }
        if (i >= num_curves
                || !tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) {
            *al = SSL_AD_ILLEGAL_PARAMETER;
            SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
            return 0;
        }

        s->s3->group_id = group_id;
        EVP_PKEY_free(s->s3->tmp.pkey);
        s->s3->tmp.pkey = NULL;
        return 1;
    }

1385 1386 1387 1388 1389
    if (group_id != s->s3->group_id) {
        /*
         * This isn't for the group that we sent in the original
         * key_share!
         */
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        *al = SSL_AD_ILLEGAL_PARAMETER;
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1391
        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_KEY_SHARE);
1392 1393 1394 1395 1396 1397
        return 0;
    }

    if (!PACKET_as_length_prefixed_2(pkt, &encoded_pt)
            || PACKET_remaining(&encoded_pt) == 0) {
        *al = SSL_AD_DECODE_ERROR;
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        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_LENGTH_MISMATCH);
1399 1400 1401 1402 1403 1404
        return 0;
    }

    skey = ssl_generate_pkey(ckey);
    if (skey == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
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        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE);
1406 1407 1408 1409 1410
        return 0;
    }
    if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
                                        PACKET_remaining(&encoded_pt))) {
        *al = SSL_AD_DECODE_ERROR;
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        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, SSL_R_BAD_ECPOINT);
1412
        EVP_PKEY_free(skey);
1413 1414 1415 1416 1417
        return 0;
    }

    if (ssl_derive(s, ckey, skey, 1) == 0) {
        *al = SSL_AD_INTERNAL_ERROR;
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1418
        SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
1419 1420 1421
        EVP_PKEY_free(skey);
        return 0;
    }
1422
    s->s3->peer_tmp = skey;
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#endif
1424 1425 1426

    return 1;
}
1427

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1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443
int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
{
    PACKET cookie;

    if (!PACKET_as_length_prefixed_2(pkt, &cookie)
            || !PACKET_memdup(&cookie, &s->ext.tls13_cookie,
                              &s->ext.tls13_cookie_len)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PARSE_STOC_COOKIE, SSL_R_LENGTH_MISMATCH);
        return 0;
    }

    return 1;
}

1444 1445 1446
int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
                              X509 *x, size_t chainidx, int *al)
{
1447
    if (context == SSL_EXT_TLS1_3_NEW_SESSION_TICKET) {
1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
        unsigned long max_early_data;

        if (!PACKET_get_net_4(pkt, &max_early_data)
                || PACKET_remaining(pkt) != 0) {
            SSLerr(SSL_F_TLS_PARSE_STOC_EARLY_DATA,
                   SSL_R_INVALID_MAX_EARLY_DATA);
            *al = SSL_AD_DECODE_ERROR;
            return 0;
        }

        s->session->ext.max_early_data = max_early_data;

        return 1;
    }

1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483
    if (PACKET_remaining(pkt) != 0) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    if (s->ext.early_data != SSL_EARLY_DATA_REJECTED
            || !s->hit
            || s->session->ext.tick_identity != 0) {
        /*
         * If we get here then we didn't send early data, or we didn't resume
         * using the first identity so the server should not be accepting it.
         */
        *al = SSL_AD_ILLEGAL_PARAMETER;
        return 0;
    }

    s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;

    return 1;
}

1484 1485
int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
                       size_t chainidx, int *al)
1486 1487 1488 1489 1490
{
#ifndef OPENSSL_NO_TLS1_3
    unsigned int identity;

    if (!PACKET_get_net_2(pkt, &identity) || PACKET_remaining(pkt) != 0) {
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        *al = SSL_AD_DECODE_ERROR;
1492 1493 1494 1495 1496
        SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_LENGTH_MISMATCH);
        return 0;
    }

    if (s->session->ext.tick_identity != (int)identity) {
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        *al = SSL_AD_ILLEGAL_PARAMETER;
1498 1499 1500 1501 1502 1503 1504 1505 1506
        SSLerr(SSL_F_TLS_PARSE_STOC_PSK, SSL_R_BAD_PSK_IDENTITY);
        return 0;
    }

    s->hit = 1;
#endif

    return 1;
}