Commit message: Sanity check ticket length.

If a ticket callback changes the HMAC digest to SHA512 the existing
sanity checks are not sufficient and an attacker could perform a DoS
attack with a malformed ticket. Add additional checks based on
HMAC size.

Thanks to Shi Lei for reporting this bug.

CVE-2016-6302

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
CVE: CVE-2016-6302
CWE: CWE-20
Vulnerability description: The tls_decrypt_ticket function in ssl/t1_lib.c in OpenSSL before 1.1.0 does not consider the HMAC size during validation of the ticket length, which allows remote attackers to cause a denial of service via a ticket that is too short.

Project: openssl

int SSL_get_sigalgs(SSL *s, int idx,
                    int *psign, int *phash, int *psignhash,
                    unsigned char *rsig, unsigned char *rhash)
{
    const unsigned char *psig = s->s3->tmp.peer_sigalgs;
    if (psig == NULL)
        return 0;
    if (idx >= 0) {
        idx <<= 1;
        if (idx >= (int)s->s3->tmp.peer_sigalgslen)
            return 0;
        psig += idx;
        if (rhash)
            *rhash = psig[0];
        if (rsig)
            *rsig = psig[1];
        tls1_lookup_sigalg(phash, psign, psignhash, psig);
    }
    return s->s3->tmp.peer_sigalgslen / 2;
}

Project: openssl

static int compare_uint(const void *p1, const void *p2)
{
    unsigned int u1 = *((const unsigned int *)p1);
    unsigned int u2 = *((const unsigned int *)p2);
    if (u1 < u2)
        return -1;
    else if (u1 > u2)
        return 1;
    else
        return 0;
}

Project: openssl

static void get_sigorhash(int *psig, int *phash, const char *str)
{
    if (strcmp(str, "RSA") == 0) {
        *psig = EVP_PKEY_RSA;
    } else if (strcmp(str, "DSA") == 0) {
        *psig = EVP_PKEY_DSA;
    } else if (strcmp(str, "ECDSA") == 0) {
        *psig = EVP_PKEY_EC;
    } else {
        *phash = OBJ_sn2nid(str);
        if (*phash == NID_undef)
            *phash = OBJ_ln2nid(str);
    }
}

Project: openssl

static int sig_cb(const char *elem, int len, void *arg)
{
    sig_cb_st *sarg = arg;
    size_t i;
    char etmp[20], *p;
    int sig_alg = NID_undef, hash_alg = NID_undef;
    if (elem == NULL)
        return 0;
    if (sarg->sigalgcnt == MAX_SIGALGLEN)
        return 0;
    if (len > (int)(sizeof(etmp) - 1))
        return 0;
    memcpy(etmp, elem, len);
    etmp[len] = 0;
    p = strchr(etmp, '+');
    if (!p)
        return 0;
    *p = 0;
    p++;
    if (!*p)
        return 0;

    get_sigorhash(&sig_alg, &hash_alg, etmp);
    get_sigorhash(&sig_alg, &hash_alg, p);

    if (sig_alg == NID_undef || hash_alg == NID_undef)
        return 0;

    for (i = 0; i < sarg->sigalgcnt; i += 2) {
        if (sarg->sigalgs[i] == sig_alg && sarg->sigalgs[i + 1] == hash_alg)
            return 0;
    }
    sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
    sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
    return 1;
}

Project: openssl

unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *buf,
                                          unsigned char *limit, int *al)
{
    int extdatalen = 0;
    unsigned char *orig = buf;
    unsigned char *ret = buf;
#ifndef OPENSSL_NO_EC
    /* See if we support any ECC ciphersuites */
    int using_ecc = 0;
    if (s->version >= TLS1_VERSION || SSL_IS_DTLS(s)) {
        int i;
        unsigned long alg_k, alg_a;
        STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);

        for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) {
            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))
                || (alg_a & SSL_aECDSA)) {
                using_ecc = 1;
                break;
            }
        }
    }
#endif

    ret += 2;

    if (ret >= limit)
        return NULL;            /* this really never occurs, but ... */

    /* Add RI if renegotiating */
    if (s->renegotiate) {
        int el;

        if (!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) {
            SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }

        if ((limit - ret - 4 - el) < 0)
            return NULL;

        s2n(TLSEXT_TYPE_renegotiate, ret);
        s2n(el, ret);

        if (!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) {
            SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }

        ret += el;
    }
    /* Only add RI for SSLv3 */
    if (s->client_version == SSL3_VERSION)
        goto done;

    if (s->tlsext_hostname != NULL) {
        /* Add TLS extension servername to the Client Hello message */
        unsigned long size_str;
        long lenmax;

        /*-
         * check for enough space.
         * 4 for the servername type and extension length
         * 2 for servernamelist length
         * 1 for the hostname type
         * 2 for hostname length
         * + hostname length
         */

        if ((lenmax = limit - ret - 9) < 0
            || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
            return NULL;

        /* extension type and length */
        s2n(TLSEXT_TYPE_server_name, ret);
        s2n(size_str + 5, ret);

        /* length of servername list */
        s2n(size_str + 3, ret);

        /* hostname type, length and hostname */
        *(ret++) = (unsigned char)TLSEXT_NAMETYPE_host_name;
        s2n(size_str, ret);
        memcpy(ret, s->tlsext_hostname, size_str);
        ret += size_str;
    }
#ifndef OPENSSL_NO_SRP
    /* Add SRP username if there is one */
    if (s->srp_ctx.login != NULL) { /* Add TLS extension SRP username to the
                                     * Client Hello message */

        int login_len = strlen(s->srp_ctx.login);
        if (login_len > 255 || login_len == 0) {
            SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }

        /*-
         * check for enough space.
         * 4 for the srp type type and extension length
         * 1 for the srp user identity
         * + srp user identity length
         */
        if ((limit - ret - 5 - login_len) < 0)
            return NULL;

        /* fill in the extension */
        s2n(TLSEXT_TYPE_srp, ret);
        s2n(login_len + 1, ret);
        (*ret++) = (unsigned char)login_len;
        memcpy(ret, s->srp_ctx.login, login_len);
        ret += login_len;
    }
#endif

#ifndef OPENSSL_NO_EC
    if (using_ecc) {
        /*
         * Add TLS extension ECPointFormats to the ClientHello message
         */
        long lenmax;
        const unsigned char *pcurves, *pformats;
        size_t num_curves, num_formats, curves_list_len;
        size_t i;
        unsigned char *etmp;

        tls1_get_formatlist(s, &pformats, &num_formats);

        if ((lenmax = limit - ret - 5) < 0)
            return NULL;
        if (num_formats > (size_t)lenmax)
            return NULL;
        if (num_formats > 255) {
            SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }

        s2n(TLSEXT_TYPE_ec_point_formats, ret);
        /* The point format list has 1-byte length. */
        s2n(num_formats + 1, ret);
        *(ret++) = (unsigned char)num_formats;
        memcpy(ret, pformats, num_formats);
        ret += num_formats;

        /*
         * Add TLS extension EllipticCurves to the ClientHello message
         */
        pcurves = s->tlsext_ellipticcurvelist;
        if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves))
            return NULL;

        if ((lenmax = limit - ret - 6) < 0)
            return NULL;
        if (num_curves > (size_t)lenmax / 2)
            return NULL;
        if (num_curves > 65532 / 2) {
            SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }

        s2n(TLSEXT_TYPE_elliptic_curves, ret);
        etmp = ret + 4;
        /* Copy curve ID if supported */
        for (i = 0; i < num_curves; i++, pcurves += 2) {
            if (tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) {
                *etmp++ = pcurves[0];
                *etmp++ = pcurves[1];
            }
        }

        curves_list_len = etmp - ret - 4;

        s2n(curves_list_len + 2, ret);
        s2n(curves_list_len, ret);
        ret += curves_list_len;
    }
#endif                          /* OPENSSL_NO_EC */

    if (tls_use_ticket(s)) {
        int ticklen;
        if (!s->new_session && s->session && s->session->tlsext_tick)
            ticklen = s->session->tlsext_ticklen;
        else if (s->session && s->tlsext_session_ticket &&
                 s->tlsext_session_ticket->data) {
            ticklen = s->tlsext_session_ticket->length;
            s->session->tlsext_tick = OPENSSL_malloc(ticklen);
            if (s->session->tlsext_tick == NULL)
                return NULL;
            memcpy(s->session->tlsext_tick,
                   s->tlsext_session_ticket->data, ticklen);
            s->session->tlsext_ticklen = ticklen;
        } else
            ticklen = 0;
        if (ticklen == 0 && s->tlsext_session_ticket &&
            s->tlsext_session_ticket->data == NULL)
            goto skip_ext;
        /*
         * Check for enough room 2 for extension type, 2 for len rest for
         * ticket
         */
        if ((long)(limit - ret - 4 - ticklen) < 0)
            return NULL;
        s2n(TLSEXT_TYPE_session_ticket, ret);
        s2n(ticklen, ret);
        if (ticklen) {
            memcpy(ret, s->session->tlsext_tick, ticklen);
            ret += ticklen;
        }
    }
 skip_ext:

    if (SSL_CLIENT_USE_SIGALGS(s)) {
        size_t salglen;
        const unsigned char *salg;
        unsigned char *etmp;
        salglen = tls12_get_psigalgs(s, &salg);
        if ((size_t)(limit - ret) < salglen + 6)
            return NULL;
        s2n(TLSEXT_TYPE_signature_algorithms, ret);
        etmp = ret;
        /* Skip over lengths for now */
        ret += 4;
        salglen = tls12_copy_sigalgs(s, ret, salg, salglen);
        /* Fill in lengths */
        s2n(salglen + 2, etmp);
        s2n(salglen, etmp);
        ret += salglen;
    }
#ifndef OPENSSL_NO_OCSP
    if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) {
        int i;
        long extlen, idlen, itmp;
        OCSP_RESPID *id;

        idlen = 0;
        for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) {
            id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
            itmp = i2d_OCSP_RESPID(id, NULL);
            if (itmp <= 0)
                return NULL;
            idlen += itmp + 2;
        }

        if (s->tlsext_ocsp_exts) {
            extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
            if (extlen < 0)
                return NULL;
        } else
            extlen = 0;

        if ((long)(limit - ret - 7 - extlen - idlen) < 0)
            return NULL;
        s2n(TLSEXT_TYPE_status_request, ret);
        if (extlen + idlen > 0xFFF0)
            return NULL;
        s2n(extlen + idlen + 5, ret);
        *(ret++) = TLSEXT_STATUSTYPE_ocsp;
        s2n(idlen, ret);
        for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) {
            /* save position of id len */
            unsigned char *q = ret;
            id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
            /* skip over id len */
            ret += 2;
            itmp = i2d_OCSP_RESPID(id, &ret);
            /* write id len */
            s2n(itmp, q);
        }
        s2n(extlen, ret);
        if (extlen > 0)
            i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
    }
#endif
#ifndef OPENSSL_NO_HEARTBEATS
    if (SSL_IS_DTLS(s)) {
        /* Add Heartbeat extension */
        if ((limit - ret - 4 - 1) < 0)
            return NULL;
        s2n(TLSEXT_TYPE_heartbeat, ret);
        s2n(1, ret);
        /*-
         * Set mode:
         * 1: peer may send requests
         * 2: peer not allowed to send requests
         */
        if (s->tlsext_heartbeat & SSL_DTLSEXT_HB_DONT_RECV_REQUESTS)
            *(ret++) = SSL_DTLSEXT_HB_DONT_SEND_REQUESTS;
        else
            *(ret++) = SSL_DTLSEXT_HB_ENABLED;
    }
#endif

#ifndef OPENSSL_NO_NEXTPROTONEG
    if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len) {
        /*
         * The client advertises an empty extension to indicate its support
         * for Next Protocol Negotiation
         */
        if (limit - ret - 4 < 0)
            return NULL;
        s2n(TLSEXT_TYPE_next_proto_neg, ret);
        s2n(0, ret);
    }
#endif

    /*
     * finish_md_len is non-zero during a renegotiation, so
     * this avoids sending ALPN during the renegotiation
     * (see longer comment below)
     */
    if (s->alpn_client_proto_list && !s->s3->tmp.finish_md_len) {
        if ((size_t)(limit - ret) < 6 + s->alpn_client_proto_list_len)
            return NULL;
        s2n(TLSEXT_TYPE_application_layer_protocol_negotiation, ret);
        s2n(2 + s->alpn_client_proto_list_len, ret);
        s2n(s->alpn_client_proto_list_len, ret);
        memcpy(ret, s->alpn_client_proto_list, s->alpn_client_proto_list_len);
        ret += s->alpn_client_proto_list_len;
        s->s3->alpn_sent = 1;
    }
#ifndef OPENSSL_NO_SRTP
    if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)) {
        int el;

        /* Returns 0 on success!! */
        if (ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0)) {
            SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }

        if ((limit - ret - 4 - el) < 0)
            return NULL;

        s2n(TLSEXT_TYPE_use_srtp, ret);
        s2n(el, ret);

        if (ssl_add_clienthello_use_srtp_ext(s, ret, &el, el)) {
            SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }
        ret += el;
    }
#endif
    custom_ext_init(&s->cert->cli_ext);
    /* Add custom TLS Extensions to ClientHello */
    if (!custom_ext_add(s, 0, &ret, limit, al))
        return NULL;
    s2n(TLSEXT_TYPE_encrypt_then_mac, ret);
    s2n(0, ret);
#ifndef OPENSSL_NO_CT
    if (s->ct_validation_callback != NULL) {
        s2n(TLSEXT_TYPE_signed_certificate_timestamp, ret);
        s2n(0, ret);
    }
#endif
    s2n(TLSEXT_TYPE_extended_master_secret, ret);
    s2n(0, ret);

    /*
     * Add padding to workaround bugs in F5 terminators. See
     * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
     * code works out the length of all existing extensions it MUST always
     * appear last.
     */
    if (s->options & SSL_OP_TLSEXT_PADDING) {
        int hlen = ret - (unsigned char *)s->init_buf->data;

        if (hlen > 0xff && hlen < 0x200) {
            hlen = 0x200 - hlen;
            if (hlen >= 4)
                hlen -= 4;
            else
                hlen = 0;

            s2n(TLSEXT_TYPE_padding, ret);
            s2n(hlen, ret);
            memset(ret, 0, hlen);
            ret += hlen;
        }
    }

 done:

    if ((extdatalen = ret - orig - 2) == 0)
        return orig;

    s2n(extdatalen, orig);
    return ret;
}

Project: openssl

unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *buf,
                                          unsigned char *limit, int *al)
{
    int extdatalen = 0;
    unsigned char *orig = buf;
    unsigned char *ret = buf;
#ifndef OPENSSL_NO_NEXTPROTONEG
    int next_proto_neg_seen;
#endif
#ifndef OPENSSL_NO_EC
    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_kECDHE) || (alg_a & SSL_aECDSA);
    using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
#endif

    ret += 2;
    if (ret >= limit)
        return NULL;            /* this really never occurs, but ... */

    if (s->s3->send_connection_binding) {
        int el;

        if (!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) {
            SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }

        if ((limit - ret - 4 - el) < 0)
            return NULL;

        s2n(TLSEXT_TYPE_renegotiate, ret);
        s2n(el, ret);

        if (!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) {
            SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }

        ret += el;
    }

    /* Only add RI for SSLv3 */
    if (s->version == SSL3_VERSION)
        goto done;

    if (!s->hit && s->servername_done == 1
        && s->session->tlsext_hostname != NULL) {
        if ((long)(limit - ret - 4) < 0)
            return NULL;

        s2n(TLSEXT_TYPE_server_name, ret);
        s2n(0, ret);
    }
#ifndef OPENSSL_NO_EC
    if (using_ecc) {
        const unsigned char *plist;
        size_t plistlen;
        /*
         * Add TLS extension ECPointFormats to the ServerHello message
         */
        long lenmax;

        tls1_get_formatlist(s, &plist, &plistlen);

        if ((lenmax = limit - ret - 5) < 0)
            return NULL;
        if (plistlen > (size_t)lenmax)
            return NULL;
        if (plistlen > 255) {
            SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }

        s2n(TLSEXT_TYPE_ec_point_formats, ret);
        s2n(plistlen + 1, ret);
        *(ret++) = (unsigned char)plistlen;
        memcpy(ret, plist, plistlen);
        ret += plistlen;

    }
    /*
     * Currently the server should not respond with a SupportedCurves
     * extension
     */
#endif                          /* OPENSSL_NO_EC */

    if (s->tlsext_ticket_expected && tls_use_ticket(s)) {
        if ((long)(limit - ret - 4) < 0)
            return NULL;
        s2n(TLSEXT_TYPE_session_ticket, ret);
        s2n(0, ret);
    } else {
        /*
         * if we don't add the above TLSEXT, we can't add a session ticket
         * later
         */
        s->tlsext_ticket_expected = 0;
    }

    if (s->tlsext_status_expected) {
        if ((long)(limit - ret - 4) < 0)
            return NULL;
        s2n(TLSEXT_TYPE_status_request, ret);
        s2n(0, ret);
    }
#ifndef OPENSSL_NO_SRTP
    if (SSL_IS_DTLS(s) && s->srtp_profile) {
        int el;

        /* Returns 0 on success!! */
        if (ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0)) {
            SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }
        if ((limit - ret - 4 - el) < 0)
            return NULL;

        s2n(TLSEXT_TYPE_use_srtp, ret);
        s2n(el, ret);

        if (ssl_add_serverhello_use_srtp_ext(s, ret, &el, el)) {
            SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
            return NULL;
        }
        ret += el;
    }
#endif

    if (((s->s3->tmp.new_cipher->id & 0xFFFF) == 0x80
         || (s->s3->tmp.new_cipher->id & 0xFFFF) == 0x81)
        && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) {
        const unsigned char cryptopro_ext[36] = {
            0xfd, 0xe8,         /* 65000 */
            0x00, 0x20,         /* 32 bytes length */
            0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
            0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
            0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
            0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17
        };
        if (limit - ret < 36)
            return NULL;
        memcpy(ret, cryptopro_ext, 36);
        ret += 36;

    }
#ifndef OPENSSL_NO_HEARTBEATS
    /* Add Heartbeat extension if we've received one */
    if (SSL_IS_DTLS(s) && (s->tlsext_heartbeat & SSL_DTLSEXT_HB_ENABLED)) {
        if ((limit - ret - 4 - 1) < 0)
            return NULL;
        s2n(TLSEXT_TYPE_heartbeat, ret);
        s2n(1, ret);
        /*-
         * Set mode:
         * 1: peer may send requests
         * 2: peer not allowed to send requests
         */
        if (s->tlsext_heartbeat & SSL_DTLSEXT_HB_DONT_RECV_REQUESTS)
            *(ret++) = SSL_DTLSEXT_HB_DONT_SEND_REQUESTS;
        else
            *(ret++) = SSL_DTLSEXT_HB_ENABLED;

    }
#endif

#ifndef OPENSSL_NO_NEXTPROTONEG
    next_proto_neg_seen = s->s3->next_proto_neg_seen;
    s->s3->next_proto_neg_seen = 0;
    if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb) {
        const unsigned char *npa;
        unsigned int npalen;
        int r;

        r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen,
                                              s->
                                              ctx->next_protos_advertised_cb_arg);
        if (r == SSL_TLSEXT_ERR_OK) {
            if ((long)(limit - ret - 4 - npalen) < 0)
                return NULL;
            s2n(TLSEXT_TYPE_next_proto_neg, ret);
            s2n(npalen, ret);
            memcpy(ret, npa, npalen);
            ret += npalen;
            s->s3->next_proto_neg_seen = 1;
        }
    }
#endif
    if (!custom_ext_add(s, 1, &ret, limit, al))
        return NULL;
    if (s->s3->flags & TLS1_FLAGS_ENCRYPT_THEN_MAC) {
        /*
         * Don't use encrypt_then_mac if AEAD or RC4 might want to disable
         * for other cases too.
         */
        if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD
            || s->s3->tmp.new_cipher->algorithm_enc == SSL_RC4
            || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT
            || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT12)
            s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
        else {
            s2n(TLSEXT_TYPE_encrypt_then_mac, ret);
            s2n(0, ret);
        }
    }
    if (s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) {
        s2n(TLSEXT_TYPE_extended_master_secret, ret);
        s2n(0, ret);
    }

    if (s->s3->alpn_selected != NULL) {
        const unsigned char *selected = s->s3->alpn_selected;
        unsigned int len = s->s3->alpn_selected_len;

        if ((long)(limit - ret - 4 - 2 - 1 - len) < 0)
            return NULL;
        s2n(TLSEXT_TYPE_application_layer_protocol_negotiation, ret);
        s2n(3 + len, ret);
        s2n(1 + len, ret);
        *ret++ = len;
        memcpy(ret, selected, len);
        ret += len;
    }

 done:

    if ((extdatalen = ret - orig - 2) == 0)
        return orig;

    s2n(extdatalen, orig);
    return ret;
}

Project: openssl

static int ssl_check_clienthello_tlsext_early(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);

    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;
    }
}

Project: openssl

int ssl_check_clienthello_tlsext_late(SSL *s, int *al)
{
    s->tlsext_status_expected = 0;

    /*
     * If status request then ask callback what to do. Note: this must be
     * called after servername callbacks in case the certificate has changed,
     * and must be called after the cipher has been chosen because this may
     * influence which certificate is sent
     */
    if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) {
        int ret;
        CERT_PKEY *certpkey;
        certpkey = ssl_get_server_send_pkey(s);
        /* If no certificate can't return certificate status */
        if (certpkey != NULL) {
            /*
             * Set current certificate to one we will use so SSL_get_certificate
             * et al can pick it up.
             */
            s->cert->key = certpkey;
            ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
            switch (ret) {
                /* 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;
                break;
                /* something bad happened */
            case SSL_TLSEXT_ERR_ALERT_FATAL:
            default:
                *al = SSL_AD_INTERNAL_ERROR;
                return 0;
            }
        }
    }

    if (!tls1_alpn_handle_client_hello_late(s, al)) {
        return 0;
    }

    return 1;
}

Project: openssl

static void ssl_check_for_safari(SSL *s, const PACKET *pkt)
{
    unsigned int type;
    PACKET sni, tmppkt;
    size_t ext_len;

    static const unsigned char kSafariExtensionsBlock[] = {
        0x00, 0x0a,             /* elliptic_curves extension */
        0x00, 0x08,             /* 8 bytes */
        0x00, 0x06,             /* 6 bytes of curve ids */
        0x00, 0x17,             /* P-256 */
        0x00, 0x18,             /* P-384 */
        0x00, 0x19,             /* P-521 */

        0x00, 0x0b,             /* ec_point_formats */
        0x00, 0x02,             /* 2 bytes */
        0x01,                   /* 1 point format */
        0x00,                   /* uncompressed */
        /* The following is only present in TLS 1.2 */
        0x00, 0x0d,             /* signature_algorithms */
        0x00, 0x0c,             /* 12 bytes */
        0x00, 0x0a,             /* 10 bytes */
        0x05, 0x01,             /* SHA-384/RSA */
        0x04, 0x01,             /* SHA-256/RSA */
        0x02, 0x01,             /* SHA-1/RSA */
        0x04, 0x03,             /* SHA-256/ECDSA */
        0x02, 0x03,             /* SHA-1/ECDSA */
    };

    /* Length of the common prefix (first two extensions). */
    static const size_t kSafariCommonExtensionsLength = 18;

    tmppkt = *pkt;

    if (!PACKET_forward(&tmppkt, 2)
        || !PACKET_get_net_2(&tmppkt, &type)
        || !PACKET_get_length_prefixed_2(&tmppkt, &sni)) {
        return;
    }

    if (type != TLSEXT_TYPE_server_name)
        return;

    ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ?
        sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength;

    s->s3->is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock,
                                             ext_len);
}

Project: openssl

static char 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;
}

Project: openssl

int ssl_parse_clienthello_tlsext(SSL *s, PACKET *pkt)
{
    int al = -1;
    custom_ext_init(&s->cert->srv_ext);
    if (ssl_scan_clienthello_tlsext(s, pkt, &al) <= 0) {
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
        return 0;
    }
    if (ssl_check_clienthello_tlsext_early(s) <= 0) {
        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, SSL_R_CLIENTHELLO_TLSEXT);
        return 0;
    }
    return 1;
}

Project: openssl

int ssl_parse_serverhello_tlsext(SSL *s, PACKET *pkt)
{
    int al = -1;
    if (s->version < SSL3_VERSION)
        return 1;
    if (ssl_scan_serverhello_tlsext(s, pkt, &al) <= 0) {
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
        return 0;
    }

    if (ssl_check_serverhello_tlsext(s) <= 0) {
        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, SSL_R_SERVERHELLO_TLSEXT);
        return 0;
    }
    return 1;
}

Project: openssl

int ssl_prepare_clienthello_tlsext(SSL *s)
{
    s->s3->alpn_sent = 0;
    return 1;
}

Project: openssl

static int ssl_scan_clienthello_tlsext(SSL *s, PACKET *pkt, int *al)
{
    unsigned int type;
    int renegotiate_seen = 0;
    PACKET extensions;

    *al = SSL_AD_DECODE_ERROR;
    s->servername_done = 0;
    s->tlsext_status_type = -1;
#ifndef OPENSSL_NO_NEXTPROTONEG
    s->s3->next_proto_neg_seen = 0;
#endif

    OPENSSL_free(s->s3->alpn_selected);
    s->s3->alpn_selected = NULL;
    s->s3->alpn_selected_len = 0;
    OPENSSL_free(s->s3->alpn_proposed);
    s->s3->alpn_proposed = NULL;
    s->s3->alpn_proposed_len = 0;
#ifndef OPENSSL_NO_HEARTBEATS
    s->tlsext_heartbeat &= ~(SSL_DTLSEXT_HB_ENABLED |
                             SSL_DTLSEXT_HB_DONT_SEND_REQUESTS);
#endif

#ifndef OPENSSL_NO_EC
    if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
        ssl_check_for_safari(s, pkt);
#endif                          /* !OPENSSL_NO_EC */

    /* Clear any signature algorithms extension received */
    OPENSSL_free(s->s3->tmp.peer_sigalgs);
    s->s3->tmp.peer_sigalgs = NULL;
    s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;

#ifndef OPENSSL_NO_SRP
    OPENSSL_free(s->srp_ctx.login);
    s->srp_ctx.login = NULL;
#endif

    s->srtp_profile = NULL;

    if (PACKET_remaining(pkt) == 0)
        goto ri_check;

    if (!PACKET_as_length_prefixed_2(pkt, &extensions))
        return 0;

    if (!tls1_check_duplicate_extensions(&extensions))
        return 0;

    /*
     * We parse all extensions to ensure the ClientHello is well-formed but,
     * unless an extension specifies otherwise, we ignore extensions upon
     * resumption.
     */
    while (PACKET_get_net_2(&extensions, &type)) {
        PACKET extension;
        if (!PACKET_get_length_prefixed_2(&extensions, &extension))
            return 0;

        if (s->tlsext_debug_cb)
            s->tlsext_debug_cb(s, 0, type, PACKET_data(&extension),
                               PACKET_remaining(&extension),
                               s->tlsext_debug_arg);

        if (type == TLSEXT_TYPE_renegotiate) {
            if (!ssl_parse_clienthello_renegotiate_ext(s, &extension, al))
                return 0;
            renegotiate_seen = 1;
        } else if (s->version == SSL3_VERSION) {
        }
/*-
 * The servername extension is treated as follows:
 *
 * - Only the hostname type is supported with a maximum length of 255.
 * - The servername is rejected if too long or if it contains zeros,
 *   in which case an fatal alert is generated.
 * - The servername field is maintained together with the session cache.
 * - When a session is resumed, the servername call back invoked in order
 *   to allow the application to position itself to the right context.
 * - The servername is acknowledged if it is new for a session or when
 *   it is identical to a previously used for the same session.
 *   Applications can control the behaviour.  They can at any time
 *   set a 'desirable' servername for a new SSL object. This can be the
 *   case for example with HTTPS when a Host: header field is received and
 *   a renegotiation is requested. In this case, a possible servername
 *   presented in the new client hello is only acknowledged if it matches
 *   the value of the Host: field.
 * - Applications must  use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
 *   if they provide for changing an explicit servername context for the
 *   session, i.e. when the session has been established with a servername
 *   extension.
 * - On session reconnect, the servername extension may be absent.
 *
 */

        else if (type == TLSEXT_TYPE_server_name) {
            unsigned int servname_type;
            PACKET sni, hostname;

            if (!PACKET_as_length_prefixed_2(&extension, &sni)
                /* ServerNameList must be at least 1 byte long. */
                || PACKET_remaining(&sni) == 0) {
                return 0;
            }

            /*
             * Although the server_name extension was intended to be
             * extensible to new name types, RFC 4366 defined the
             * syntax inextensibility and OpenSSL 1.0.x parses it as
             * such.
             * RFC 6066 corrected the mistake but adding new name types
             * is nevertheless no longer feasible, so act as if no other
             * SNI types can exist, to simplify parsing.
             *
             * Also note that the RFC permits only one SNI value per type,
             * i.e., we can only have a single hostname.
             */
            if (!PACKET_get_1(&sni, &servname_type)
                || servname_type != TLSEXT_NAMETYPE_host_name
                || !PACKET_as_length_prefixed_2(&sni, &hostname)) {
                return 0;
            }

            if (!s->hit) {
                if (PACKET_remaining(&hostname) > TLSEXT_MAXLEN_host_name) {
                    *al = TLS1_AD_UNRECOGNIZED_NAME;
                    return 0;
                }

                if (PACKET_contains_zero_byte(&hostname)) {
                    *al = TLS1_AD_UNRECOGNIZED_NAME;
                    return 0;
                }

                if (!PACKET_strndup(&hostname, &s->session->tlsext_hostname)) {
                    *al = TLS1_AD_INTERNAL_ERROR;
                    return 0;
                }

                s->servername_done = 1;
            } else {
                /*
                 * TODO(openssl-team): if the SNI doesn't match, we MUST
                 * fall back to a full handshake.
                 */
                s->servername_done = s->session->tlsext_hostname
                    && PACKET_equal(&hostname, s->session->tlsext_hostname,
                                    strlen(s->session->tlsext_hostname));
            }
        }
#ifndef OPENSSL_NO_SRP
        else if (type == TLSEXT_TYPE_srp) {
            PACKET srp_I;

            if (!PACKET_as_length_prefixed_1(&extension, &srp_I))
                return 0;

            if (PACKET_contains_zero_byte(&srp_I))
                return 0;

            /*
             * TODO(openssl-team): currently, we re-authenticate the user
             * upon resumption. Instead, we MUST ignore the login.
             */
            if (!PACKET_strndup(&srp_I, &s->srp_ctx.login)) {
                *al = TLS1_AD_INTERNAL_ERROR;
                return 0;
            }
        }
#endif

#ifndef OPENSSL_NO_EC
        else if (type == TLSEXT_TYPE_ec_point_formats) {
            PACKET ec_point_format_list;

            if (!PACKET_as_length_prefixed_1(&extension, &ec_point_format_list)
                || PACKET_remaining(&ec_point_format_list) == 0) {
                return 0;
            }

            if (!s->hit) {
                if (!PACKET_memdup(&ec_point_format_list,
                                   &s->session->tlsext_ecpointformatlist,
                                   &s->
                                   session->tlsext_ecpointformatlist_length)) {
                    *al = TLS1_AD_INTERNAL_ERROR;
                    return 0;
                }
            }
        } else if (type == TLSEXT_TYPE_elliptic_curves) {
            PACKET elliptic_curve_list;

            /* Each NamedCurve is 2 bytes and we must have at least 1. */
            if (!PACKET_as_length_prefixed_2(&extension, &elliptic_curve_list)
                || PACKET_remaining(&elliptic_curve_list) == 0
                || (PACKET_remaining(&elliptic_curve_list) % 2) != 0) {
                return 0;
            }

            if (!s->hit) {
                if (!PACKET_memdup(&elliptic_curve_list,
                                   &s->session->tlsext_ellipticcurvelist,
                                   &s->
                                   session->tlsext_ellipticcurvelist_length)) {
                    *al = TLS1_AD_INTERNAL_ERROR;
                    return 0;
                }
            }
        }
#endif                          /* OPENSSL_NO_EC */
        else if (type == TLSEXT_TYPE_session_ticket) {
            if (s->tls_session_ticket_ext_cb &&
                !s->tls_session_ticket_ext_cb(s, PACKET_data(&extension),
                                              PACKET_remaining(&extension),
                                              s->tls_session_ticket_ext_cb_arg))
            {
                *al = TLS1_AD_INTERNAL_ERROR;
                return 0;
            }
        } else if (type == TLSEXT_TYPE_signature_algorithms) {
            PACKET supported_sig_algs;

            if (!PACKET_as_length_prefixed_2(&extension, &supported_sig_algs)
                || (PACKET_remaining(&supported_sig_algs) % 2) != 0
                || PACKET_remaining(&supported_sig_algs) == 0) {
                return 0;
            }

            if (!s->hit) {
                if (!tls1_save_sigalgs(s, PACKET_data(&supported_sig_algs),
                                       PACKET_remaining(&supported_sig_algs))) {
                    return 0;
                }
            }
        } else if (type == TLSEXT_TYPE_status_request) {
            if (!PACKET_get_1(&extension,
                              (unsigned int *)&s->tlsext_status_type)) {
                return 0;
            }
#ifndef OPENSSL_NO_OCSP
            if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) {
                const unsigned char *ext_data;
                PACKET responder_id_list, exts;
                if (!PACKET_get_length_prefixed_2
                    (&extension, &responder_id_list))
                    return 0;

                while (PACKET_remaining(&responder_id_list) > 0) {
                    OCSP_RESPID *id;
                    PACKET responder_id;
                    const unsigned char *id_data;

                    if (!PACKET_get_length_prefixed_2(&responder_id_list,
                                                      &responder_id)
                        || PACKET_remaining(&responder_id) == 0) {
                        return 0;
                    }

                    if (s->tlsext_ocsp_ids == NULL
                        && (s->tlsext_ocsp_ids =
                            sk_OCSP_RESPID_new_null()) == NULL) {
                        *al = SSL_AD_INTERNAL_ERROR;
                        return 0;
                    }

                    id_data = PACKET_data(&responder_id);
                    id = d2i_OCSP_RESPID(NULL, &id_data,
                                         PACKET_remaining(&responder_id));
                    if (id == NULL)
                        return 0;

                    if (id_data != PACKET_end(&responder_id)) {
                        OCSP_RESPID_free(id);
                        return 0;
                    }

                    if (!sk_OCSP_RESPID_push(s->tlsext_ocsp_ids, id)) {
                        OCSP_RESPID_free(id);
                        *al = SSL_AD_INTERNAL_ERROR;
                        return 0;
                    }
                }

                /* Read in request_extensions */
                if (!PACKET_as_length_prefixed_2(&extension, &exts))
                    return 0;

                if (PACKET_remaining(&exts) > 0) {
                    ext_data = PACKET_data(&exts);
                    sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
                                               X509_EXTENSION_free);
                    s->tlsext_ocsp_exts =
                        d2i_X509_EXTENSIONS(NULL, &ext_data,
                                            PACKET_remaining(&exts));
                    if (s->tlsext_ocsp_exts == NULL
                        || ext_data != PACKET_end(&exts)) {
                        return 0;
                    }
                }
            } else
#endif
            {
                /*
                 * We don't know what to do with any other type so ignore it.
                 */
                s->tlsext_status_type = -1;
            }
        }
#ifndef OPENSSL_NO_HEARTBEATS
        else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_heartbeat) {
            unsigned int hbtype;

            if (!PACKET_get_1(&extension, &hbtype)
                || PACKET_remaining(&extension)) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
            switch (hbtype) {
            case 0x01:         /* Client allows us to send HB requests */
                s->tlsext_heartbeat |= SSL_DTLSEXT_HB_ENABLED;
                break;
            case 0x02:         /* Client doesn't accept HB requests */
                s->tlsext_heartbeat |= SSL_DTLSEXT_HB_ENABLED;
                s->tlsext_heartbeat |= SSL_DTLSEXT_HB_DONT_SEND_REQUESTS;
                break;
            default:
                *al = SSL_AD_ILLEGAL_PARAMETER;
                return 0;
            }
        }
#endif
#ifndef OPENSSL_NO_NEXTPROTONEG
        else if (type == TLSEXT_TYPE_next_proto_neg &&
                 s->s3->tmp.finish_md_len == 0) {
            /*-
             * We shouldn't accept this extension on a
             * renegotiation.
             *
             * s->new_session will be set on renegotiation, but we
             * probably shouldn't rely that it couldn't be set on
             * the initial renegotiation too in certain cases (when
             * there's some other reason to disallow resuming an
             * earlier session -- the current code won't be doing
             * anything like that, but this might change).
             *
             * A valid sign that there's been a previous handshake
             * in this connection is if s->s3->tmp.finish_md_len >
             * 0.  (We are talking about a check that will happen
             * in the Hello protocol round, well before a new
             * Finished message could have been computed.)
             */
            s->s3->next_proto_neg_seen = 1;
        }
#endif

        else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation &&
                 s->s3->tmp.finish_md_len == 0) {
            if (!tls1_alpn_handle_client_hello(s, &extension, al))
                return 0;
        }

        /* session ticket processed earlier */
#ifndef OPENSSL_NO_SRTP
        else if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)
                 && type == TLSEXT_TYPE_use_srtp) {
            if (ssl_parse_clienthello_use_srtp_ext(s, &extension, al))
                return 0;
        }
#endif
        else if (type == TLSEXT_TYPE_encrypt_then_mac)
            s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
        /*
         * Note: extended master secret extension handled in
         * tls_check_serverhello_tlsext_early()
         */

        /*
         * If this ClientHello extension was unhandled and this is a
         * nonresumed connection, check whether the extension is a custom
         * TLS Extension (has a custom_srv_ext_record), and if so call the
         * callback and record the extension number so that an appropriate
         * ServerHello may be later returned.
         */
        else if (!s->hit) {
            if (custom_ext_parse(s, 1, type, PACKET_data(&extension),
                                 PACKET_remaining(&extension), al) <= 0)
                return 0;
        }
    }

    if (PACKET_remaining(pkt) != 0) {
        /*
         * tls1_check_duplicate_extensions should ensure this never happens.
         */
        *al = SSL_AD_INTERNAL_ERROR;
        return 0;
    }

 ri_check:

    /* Need RI if renegotiating */

    if (!renegotiate_seen && s->renegotiate &&
        !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
               SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
        return 0;
    }

    /*
     * This function currently has no state to clean up, so it returns directly.
     * If parsing fails at any point, the function returns early.
     * The SSL object may be left with partial data from extensions, but it must
     * then no longer be used, and clearing it up will free the leftovers.
     */
    return 1;
}

Project: openssl

static int ssl_scan_serverhello_tlsext(SSL *s, PACKET *pkt, int *al)
{
    unsigned int length, type, size;
    int tlsext_servername = 0;
    int renegotiate_seen = 0;

#ifndef OPENSSL_NO_NEXTPROTONEG
    s->s3->next_proto_neg_seen = 0;
#endif
    s->tlsext_ticket_expected = 0;

    OPENSSL_free(s->s3->alpn_selected);
    s->s3->alpn_selected = NULL;
#ifndef OPENSSL_NO_HEARTBEATS
    s->tlsext_heartbeat &= ~(SSL_DTLSEXT_HB_ENABLED |
                             SSL_DTLSEXT_HB_DONT_SEND_REQUESTS);
#endif

    s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;

    s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS;

    if (!PACKET_get_net_2(pkt, &length))
        goto ri_check;

    if (PACKET_remaining(pkt) != length) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    if (!tls1_check_duplicate_extensions(pkt)) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    while (PACKET_get_net_2(pkt, &type) && PACKET_get_net_2(pkt, &size)) {
        const unsigned char *data;
        PACKET spkt;

        if (!PACKET_get_sub_packet(pkt, &spkt, size)
            || !PACKET_peek_bytes(&spkt, &data, size))
            goto ri_check;

        if (s->tlsext_debug_cb)
            s->tlsext_debug_cb(s, 1, type, data, size, s->tlsext_debug_arg);

        if (type == TLSEXT_TYPE_renegotiate) {
            if (!ssl_parse_serverhello_renegotiate_ext(s, &spkt, al))
                return 0;
            renegotiate_seen = 1;
        } else if (s->version == SSL3_VERSION) {
        } else if (type == TLSEXT_TYPE_server_name) {
            if (s->tlsext_hostname == NULL || size > 0) {
                *al = TLS1_AD_UNRECOGNIZED_NAME;
                return 0;
            }
            tlsext_servername = 1;
        }
#ifndef OPENSSL_NO_EC
        else if (type == TLSEXT_TYPE_ec_point_formats) {
            unsigned int ecpointformatlist_length;
            if (!PACKET_get_1(&spkt, &ecpointformatlist_length)
                || ecpointformatlist_length != size - 1) {
                *al = TLS1_AD_DECODE_ERROR;
                return 0;
            }
            if (!s->hit) {
                s->session->tlsext_ecpointformatlist_length = 0;
                OPENSSL_free(s->session->tlsext_ecpointformatlist);
                if ((s->session->tlsext_ecpointformatlist =
                     OPENSSL_malloc(ecpointformatlist_length)) == NULL) {
                    *al = TLS1_AD_INTERNAL_ERROR;
                    return 0;
                }
                s->session->tlsext_ecpointformatlist_length =
                    ecpointformatlist_length;
                if (!PACKET_copy_bytes(&spkt,
                                       s->session->tlsext_ecpointformatlist,
                                       ecpointformatlist_length)) {
                    *al = TLS1_AD_DECODE_ERROR;
                    return 0;
                }

            }
        }
#endif                          /* OPENSSL_NO_EC */

        else if (type == TLSEXT_TYPE_session_ticket) {
            if (s->tls_session_ticket_ext_cb &&
                !s->tls_session_ticket_ext_cb(s, data, size,
                                              s->tls_session_ticket_ext_cb_arg))
            {
                *al = TLS1_AD_INTERNAL_ERROR;
                return 0;
            }
            if (!tls_use_ticket(s) || (size > 0)) {
                *al = TLS1_AD_UNSUPPORTED_EXTENSION;
                return 0;
            }
            s->tlsext_ticket_expected = 1;
        } else if (type == TLSEXT_TYPE_status_request) {
            /*
             * MUST be empty and only sent if we've requested a status
             * request message.
             */
            if ((s->tlsext_status_type == -1) || (size > 0)) {
                *al = TLS1_AD_UNSUPPORTED_EXTENSION;
                return 0;
            }
            /* Set flag to expect CertificateStatus message */
            s->tlsext_status_expected = 1;
        }
#ifndef OPENSSL_NO_CT
        /*
         * 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.
         */
        else if (type == TLSEXT_TYPE_signed_certificate_timestamp &&
                 s->ct_validation_callback != NULL) {
            /* Simply copy it off for later processing */
            if (s->tlsext_scts != NULL) {
                OPENSSL_free(s->tlsext_scts);
                s->tlsext_scts = NULL;
            }
            s->tlsext_scts_len = size;
            if (size > 0) {
                s->tlsext_scts = OPENSSL_malloc(size);
                if (s->tlsext_scts == NULL) {
                    *al = TLS1_AD_INTERNAL_ERROR;
                    return 0;
                }
                memcpy(s->tlsext_scts, data, size);
            }
        }
#endif
#ifndef OPENSSL_NO_NEXTPROTONEG
        else if (type == TLSEXT_TYPE_next_proto_neg &&
                 s->s3->tmp.finish_md_len == 0) {
            unsigned char *selected;
            unsigned char selected_len;
            /* We must have requested it. */
            if (s->ctx->next_proto_select_cb == NULL) {
                *al = TLS1_AD_UNSUPPORTED_EXTENSION;
                return 0;
            }
            /* The data must be valid */
            if (!ssl_next_proto_validate(&spkt)) {
                *al = TLS1_AD_DECODE_ERROR;
                return 0;
            }
            if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data,
                                             size,
                                             s->
                                             ctx->next_proto_select_cb_arg) !=
                SSL_TLSEXT_ERR_OK) {
                *al = TLS1_AD_INTERNAL_ERROR;
                return 0;
            }
            s->next_proto_negotiated = OPENSSL_malloc(selected_len);
            if (s->next_proto_negotiated == NULL) {
                *al = TLS1_AD_INTERNAL_ERROR;
                return 0;
            }
            memcpy(s->next_proto_negotiated, selected, selected_len);
            s->next_proto_negotiated_len = selected_len;
            s->s3->next_proto_neg_seen = 1;
        }
#endif

        else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation) {
            unsigned len;
            /* We must have requested it. */
            if (!s->s3->alpn_sent) {
                *al = TLS1_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(&spkt, &len)
                || PACKET_remaining(&spkt) != len || !PACKET_get_1(&spkt, &len)
                || PACKET_remaining(&spkt) != len) {
                *al = TLS1_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 = TLS1_AD_INTERNAL_ERROR;
                return 0;
            }
            if (!PACKET_copy_bytes(&spkt, s->s3->alpn_selected, len)) {
                *al = TLS1_AD_DECODE_ERROR;
                return 0;
            }
            s->s3->alpn_selected_len = len;
        }
#ifndef OPENSSL_NO_HEARTBEATS
        else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_heartbeat) {
            unsigned int hbtype;
            if (!PACKET_get_1(&spkt, &hbtype)) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
            switch (hbtype) {
            case 0x01:         /* Server allows us to send HB requests */
                s->tlsext_heartbeat |= SSL_DTLSEXT_HB_ENABLED;
                break;
            case 0x02:         /* Server doesn't accept HB requests */
                s->tlsext_heartbeat |= SSL_DTLSEXT_HB_ENABLED;
                s->tlsext_heartbeat |= SSL_DTLSEXT_HB_DONT_SEND_REQUESTS;
                break;
            default:
                *al = SSL_AD_ILLEGAL_PARAMETER;
                return 0;
            }
        }
#endif
#ifndef OPENSSL_NO_SRTP
        else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_use_srtp) {
            if (ssl_parse_serverhello_use_srtp_ext(s, &spkt, al))
                return 0;
        }
#endif
        else if (type == TLSEXT_TYPE_encrypt_then_mac) {
            /* Ignore if inappropriate ciphersuite */
            if (s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
                && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
                s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
        } else if (type == TLSEXT_TYPE_extended_master_secret) {
            s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
            if (!s->hit)
                s->session->flags |= SSL_SESS_FLAG_EXTMS;
        }
        /*
         * If this extension type was not otherwise handled, but matches a
         * custom_cli_ext_record, then send it to the c callback
         */
        else if (custom_ext_parse(s, 0, type, data, size, al) <= 0)
            return 0;
    }

    if (PACKET_remaining(pkt) != 0) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    if (!s->hit && tlsext_servername == 1) {
        if (s->tlsext_hostname) {
            if (s->session->tlsext_hostname == NULL) {
                s->session->tlsext_hostname =
                    OPENSSL_strdup(s->tlsext_hostname);
                if (!s->session->tlsext_hostname) {
                    *al = SSL_AD_UNRECOGNIZED_NAME;
                    return 0;
                }
            } else {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
        }
    }

 ri_check:

    /*
     * Determine if we need to see RI. Strictly speaking if we want to avoid
     * an attack we should *always* see RI even on initial server hello
     * because the client doesn't see any renegotiation during an attack.
     * However this would mean we could not connect to any server which
     * doesn't support RI so for the immediate future tolerate RI absence
     */
    if (!renegotiate_seen && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
        && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
               SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
        return 0;
    }

    if (s->hit) {
        /*
         * Check extended master secret extension is consistent with
         * original session.
         */
        if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) !=
            !(s->session->flags & SSL_SESS_FLAG_EXTMS)) {
            *al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT, SSL_R_INCONSISTENT_EXTMS);
            return 0;
        }
    }

    return 1;
}

Project: openssl

int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee)
{
    if (vfy)
        vfy = SSL_SECOP_PEER;
    if (is_ee) {
        if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy))
            return SSL_R_EE_KEY_TOO_SMALL;
    } else {
        if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy))
            return SSL_R_CA_KEY_TOO_SMALL;
    }
    if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy))
        return SSL_R_CA_MD_TOO_WEAK;
    return 1;
}

Project: openssl

int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy)
{
    int rv, start_idx, i;
    if (x == NULL) {
        x = sk_X509_value(sk, 0);
        start_idx = 1;
    } else
        start_idx = 0;

    rv = ssl_security_cert(s, NULL, x, vfy, 1);
    if (rv != 1)
        return rv;

    for (i = start_idx; i < sk_X509_num(sk); i++) {
        x = sk_X509_value(sk, i);
        rv = ssl_security_cert(s, NULL, x, vfy, 0);
        if (rv != 1)
            return rv;
    }
    return 1;
}

Project: openssl

static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
{
    int secbits = -1;
    EVP_PKEY *pkey = X509_get0_pubkey(x);
    if (pkey) {
        /*
         * If no parameters this will return -1 and fail using the default
         * security callback for any non-zero security level. This will
         * reject keys which omit parameters but this only affects DSA and
         * omission of parameters is never (?) done in practice.
         */
        secbits = EVP_PKEY_security_bits(pkey);
    }
    if (s)
        return ssl_security(s, op, secbits, 0, x);
    else
        return ssl_ctx_security(ctx, op, secbits, 0, x);
}

Project: openssl

static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
{
    /* Lookup signature algorithm digest */
    int secbits = -1, md_nid = NID_undef, sig_nid;
    /* Don't check signature if self signed */
    if ((X509_get_extension_flags(x) & EXFLAG_SS) != 0)
        return 1;
    sig_nid = X509_get_signature_nid(x);
    if (sig_nid && OBJ_find_sigid_algs(sig_nid, &md_nid, NULL)) {
        const EVP_MD *md;
        if (md_nid && (md = EVP_get_digestbynid(md_nid)))
            secbits = EVP_MD_size(md) * 4;
    }
    if (s)
        return ssl_security(s, op, secbits, md_nid, x);
    else
        return ssl_ctx_security(ctx, op, secbits, md_nid, x);
}

Project: openssl

void ssl_set_client_disabled(SSL *s)
{
    s->s3->tmp.mask_a = 0;
    s->s3->tmp.mask_k = 0;
    ssl_set_sig_mask(&s->s3->tmp.mask_a, s, SSL_SECOP_SIGALG_MASK);
    ssl_get_client_min_max_version(s, &s->s3->tmp.min_ver, &s->s3->tmp.max_ver);
#ifndef OPENSSL_NO_PSK
    /* with PSK there must be client callback set */
    if (!s->psk_client_callback) {
        s->s3->tmp.mask_a |= SSL_aPSK;
        s->s3->tmp.mask_k |= SSL_PSK;
    }
#endif                          /* OPENSSL_NO_PSK */
#ifndef OPENSSL_NO_SRP
    if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) {
        s->s3->tmp.mask_a |= SSL_aSRP;
        s->s3->tmp.mask_k |= SSL_kSRP;
    }
#endif
}

Project: openssl

void ssl_set_default_md(SSL *s)
{
    const EVP_MD **pmd = s->s3->tmp.md;
#ifndef OPENSSL_NO_DSA
    pmd[SSL_PKEY_DSA_SIGN] = ssl_md(SSL_MD_SHA1_IDX);
#endif
#ifndef OPENSSL_NO_RSA
    if (SSL_USE_SIGALGS(s))
        pmd[SSL_PKEY_RSA_SIGN] = ssl_md(SSL_MD_SHA1_IDX);
    else
        pmd[SSL_PKEY_RSA_SIGN] = ssl_md(SSL_MD_MD5_SHA1_IDX);
    pmd[SSL_PKEY_RSA_ENC] = pmd[SSL_PKEY_RSA_SIGN];
#endif
#ifndef OPENSSL_NO_EC
    pmd[SSL_PKEY_ECC] = ssl_md(SSL_MD_SHA1_IDX);
#endif
#ifndef OPENSSL_NO_GOST
    pmd[SSL_PKEY_GOST01] = ssl_md(SSL_MD_GOST94_IDX);
    pmd[SSL_PKEY_GOST12_256] = ssl_md(SSL_MD_GOST12_256_IDX);
    pmd[SSL_PKEY_GOST12_512] = ssl_md(SSL_MD_GOST12_512_IDX);
#endif
}

Project: openssl

void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op)
{
    const unsigned char *sigalgs;
    size_t i, sigalgslen;
    int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
    /*
     * Now go through all signature algorithms seeing if we support any for
     * RSA, DSA, ECDSA. Do this for all versions not just TLS 1.2. To keep
     * down calls to security callback only check if we have to.
     */
    sigalgslen = tls12_get_psigalgs(s, &sigalgs);
    for (i = 0; i < sigalgslen; i += 2, sigalgs += 2) {
        switch (sigalgs[1]) {
#ifndef OPENSSL_NO_RSA
        case TLSEXT_signature_rsa:
            if (!have_rsa && tls12_sigalg_allowed(s, op, sigalgs))
                have_rsa = 1;
            break;
#endif
#ifndef OPENSSL_NO_DSA
        case TLSEXT_signature_dsa:
            if (!have_dsa && tls12_sigalg_allowed(s, op, sigalgs))
                have_dsa = 1;
            break;
#endif
#ifndef OPENSSL_NO_EC
        case TLSEXT_signature_ecdsa:
            if (!have_ecdsa && tls12_sigalg_allowed(s, op, sigalgs))
                have_ecdsa = 1;
            break;
#endif
        }
    }
    if (!have_rsa)
        *pmask_a |= SSL_aRSA;
    if (!have_dsa)
        *pmask_a |= SSL_aDSS;
    if (!have_ecdsa)
        *pmask_a |= SSL_aECDSA;
}

Project: openssl

size_t tls12_copy_sigalgs(SSL *s, unsigned char *out,
                          const unsigned char *psig, size_t psiglen)
{
    unsigned char *tmpout = out;
    size_t i;
    for (i = 0; i < psiglen; i += 2, psig += 2) {
        if (tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, psig)) {
            *tmpout++ = psig[0];
            *tmpout++ = psig[1];
        }
    }
    return tmpout - out;
}

Project: openssl

static int tls12_find_id(int nid, const 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;
}

Project: openssl

static const tls12_hash_info *tls12_get_hash_info(unsigned char hash_alg)
{
    unsigned int i;
    if (hash_alg == 0)
        return NULL;

    for (i = 0; i < OSSL_NELEM(tls12_md_info); i++) {
        if (tls12_md_info[i].tlsext_hash == hash_alg)
            return tls12_md_info + i;
    }

    return NULL;
}

Project: openssl

static int tls12_get_pkey_idx(unsigned char sig_alg)
{
    switch (sig_alg) {
#ifndef OPENSSL_NO_RSA
    case TLSEXT_signature_rsa:
        return SSL_PKEY_RSA_SIGN;
#endif
#ifndef OPENSSL_NO_DSA
    case TLSEXT_signature_dsa:
        return SSL_PKEY_DSA_SIGN;
#endif
#ifndef OPENSSL_NO_EC
    case TLSEXT_signature_ecdsa:
        return SSL_PKEY_ECC;
#endif
#ifndef OPENSSL_NO_GOST
    case TLSEXT_signature_gostr34102001:
        return SSL_PKEY_GOST01;

    case TLSEXT_signature_gostr34102012_256:
        return SSL_PKEY_GOST12_256;

    case TLSEXT_signature_gostr34102012_512:
        return SSL_PKEY_GOST12_512;
#endif
    }
    return -1;
}

Project: openssl

int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
{
    int sig_id, md_id;
    if (!md)
        return 0;
    md_id = tls12_find_id(EVP_MD_type(md), tls12_md, OSSL_NELEM(tls12_md));
    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;
}

Project: openssl

int tls12_get_sigid(const EVP_PKEY *pk)
{
    return tls12_find_id(EVP_PKEY_id(pk), tls12_sig, OSSL_NELEM(tls12_sig));
}

Project: openssl

static int tls12_shared_sigalgs(SSL *s, TLS_SIGALGS *shsig,
                                const unsigned char *pref, size_t preflen,
                                const unsigned char *allow, size_t allowlen)
{
    const unsigned char *ptmp, *atmp;
    size_t i, j, nmatch = 0;
    for (i = 0, ptmp = pref; i < preflen; i += 2, ptmp += 2) {
        /* Skip disabled hashes or signature algorithms */
        if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, ptmp))
            continue;
        for (j = 0, atmp = allow; j < allowlen; j += 2, atmp += 2) {
            if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1]) {
                nmatch++;
                if (shsig) {
                    shsig->rhash = ptmp[0];
                    shsig->rsign = ptmp[1];
                    tls1_lookup_sigalg(&shsig->hash_nid,
                                       &shsig->sign_nid,
                                       &shsig->signandhash_nid, ptmp);
                    shsig++;
                }
                break;
            }
        }
    }
    return nmatch;
}

Project: openssl

static int tls1_alpn_handle_client_hello(SSL *s, PACKET *pkt, int *al)
{
    PACKET protocol_list, save_protocol_list, protocol;

    *al = SSL_AD_DECODE_ERROR;

    if (!PACKET_as_length_prefixed_2(pkt, &protocol_list)
        || PACKET_remaining(&protocol_list) < 2) {
        return 0;
    }

    save_protocol_list = protocol_list;
    do {
        /* Protocol names can't be empty. */
        if (!PACKET_get_length_prefixed_1(&protocol_list, &protocol)
            || PACKET_remaining(&protocol) == 0) {
            return 0;
        }
    } while (PACKET_remaining(&protocol_list) != 0);

    if (!PACKET_memdup(&save_protocol_list,
                       &s->s3->alpn_proposed, &s->s3->alpn_proposed_len)) {
        *al = TLS1_AD_INTERNAL_ERROR;
        return 0;
    }

    return 1;
}

Project: openssl

static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
{
    unsigned char comp_id, curve_id[2];
    EVP_PKEY *pkey;
    int rv;
    pkey = X509_get0_pubkey(x);
    if (!pkey)
        return 0;
    /* If not EC nothing to do */
    if (EVP_PKEY_id(pkey) != EVP_PKEY_EC)
        return 1;
    rv = tls1_set_ec_id(curve_id, &comp_id, EVP_PKEY_get0_EC_KEY(pkey));
    if (!rv)
        return 0;
    /*
     * Can't check curve_id for client certs as we don't have a supported
     * curves extension.
     */
    rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id);
    if (!rv)
        return 0;
    /*
     * Special case for suite B. We *MUST* sign using SHA256+P-256 or
     * SHA384+P-384, adjust digest if necessary.
     */
    if (set_ee_md && tls1_suiteb(s)) {
        int check_md;
        size_t i;
        CERT *c = s->cert;
        if (curve_id[0])
            return 0;
        /* Check to see we have necessary signing algorithm */
        if (curve_id[1] == TLSEXT_curve_P_256)
            check_md = NID_ecdsa_with_SHA256;
        else if (curve_id[1] == TLSEXT_curve_P_384)
            check_md = NID_ecdsa_with_SHA384;
        else
            return 0;           /* Should never happen */
        for (i = 0; i < c->shared_sigalgslen; i++)
            if (check_md == c->shared_sigalgs[i].signandhash_nid)
                break;
        if (i == c->shared_sigalgslen)
            return 0;
        if (set_ee_md == 2) {
            if (check_md == NID_ecdsa_with_SHA256)
                s->s3->tmp.md[SSL_PKEY_ECC] = EVP_sha256();
            else
                s->s3->tmp.md[SSL_PKEY_ECC] = EVP_sha384();
        }
    }
    return rv;
}

Project: openssl

int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
                     int idx)
{
    int i;
    int rv = 0;
    int check_flags = 0, strict_mode;
    CERT_PKEY *cpk = NULL;
    CERT *c = s->cert;
    uint32_t *pvalid;
    unsigned int suiteb_flags = tls1_suiteb(s);
    /* idx == -1 means checking server chains */
    if (idx != -1) {
        /* idx == -2 means checking client certificate chains */
        if (idx == -2) {
            cpk = c->key;
            idx = cpk - c->pkeys;
        } else
            cpk = c->pkeys + idx;
        pvalid = s->s3->tmp.valid_flags + idx;
        x = cpk->x509;
        pk = cpk->privatekey;
        chain = cpk->chain;
        strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
        /* If no cert or key, forget it */
        if (!x || !pk)
            goto end;
    } else {
        if (!x || !pk)
            return 0;
        idx = ssl_cert_type(x, pk);
        if (idx == -1)
            return 0;
        pvalid = s->s3->tmp.valid_flags + idx;

        if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
            check_flags = CERT_PKEY_STRICT_FLAGS;
        else
            check_flags = CERT_PKEY_VALID_FLAGS;
        strict_mode = 1;
    }

    if (suiteb_flags) {
        int ok;
        if (check_flags)
            check_flags |= CERT_PKEY_SUITEB;
        ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
        if (ok == X509_V_OK)
            rv |= CERT_PKEY_SUITEB;
        else if (!check_flags)
            goto end;
    }

    /*
     * Check all signature algorithms are consistent with signature
     * algorithms extension if TLS 1.2 or later and strict mode.
     */
    if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode) {
        int default_nid;
        unsigned char rsign = 0;
        if (s->s3->tmp.peer_sigalgs)
            default_nid = 0;
        /* If no sigalgs extension use defaults from RFC5246 */
        else {
            switch (idx) {
            case SSL_PKEY_RSA_ENC:
            case SSL_PKEY_RSA_SIGN:
                rsign = TLSEXT_signature_rsa;
                default_nid = NID_sha1WithRSAEncryption;
                break;

            case SSL_PKEY_DSA_SIGN:
                rsign = TLSEXT_signature_dsa;
                default_nid = NID_dsaWithSHA1;
                break;

            case SSL_PKEY_ECC:
                rsign = TLSEXT_signature_ecdsa;
                default_nid = NID_ecdsa_with_SHA1;
                break;

            case SSL_PKEY_GOST01:
                rsign = TLSEXT_signature_gostr34102001;
                default_nid = NID_id_GostR3411_94_with_GostR3410_2001;
                break;

            case SSL_PKEY_GOST12_256:
                rsign = TLSEXT_signature_gostr34102012_256;
                default_nid = NID_id_tc26_signwithdigest_gost3410_2012_256;
                break;

            case SSL_PKEY_GOST12_512:
                rsign = TLSEXT_signature_gostr34102012_512;
                default_nid = NID_id_tc26_signwithdigest_gost3410_2012_512;
                break;

            default:
                default_nid = -1;
                break;
            }
        }
        /*
         * If peer sent no signature algorithms extension and we have set
         * preferred signature algorithms check we support sha1.
         */
        if (default_nid > 0 && c->conf_sigalgs) {
            size_t j;
            const unsigned char *p = c->conf_sigalgs;
            for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2) {
                if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
                    break;
            }
            if (j == c->conf_sigalgslen) {
                if (check_flags)
                    goto skip_sigs;
                else
                    goto end;
            }
        }
        /* Check signature algorithm of each cert in chain */
        if (!tls1_check_sig_alg(c, x, default_nid)) {
            if (!check_flags)
                goto end;
        } else
            rv |= CERT_PKEY_EE_SIGNATURE;
        rv |= CERT_PKEY_CA_SIGNATURE;
        for (i = 0; i < sk_X509_num(chain); i++) {
            if (!tls1_check_sig_alg(c, sk_X509_value(chain, i), default_nid)) {
                if (check_flags) {
                    rv &= ~CERT_PKEY_CA_SIGNATURE;
                    break;
                } else
                    goto end;
            }
        }
    }
    /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
    else if (check_flags)
        rv |= CERT_PKEY_EE_SIGNATURE | CERT_PKEY_CA_SIGNATURE;
 skip_sigs:
    /* Check cert parameters are consistent */
    if (tls1_check_cert_param(s, x, check_flags ? 1 : 2))
        rv |= CERT_PKEY_EE_PARAM;
    else if (!check_flags)
        goto end;
    if (!s->server)
        rv |= CERT_PKEY_CA_PARAM;
    /* In strict mode check rest of chain too */
    else if (strict_mode) {
        rv |= CERT_PKEY_CA_PARAM;
        for (i = 0; i < sk_X509_num(chain); i++) {
            X509 *ca = sk_X509_value(chain, i);
            if (!tls1_check_cert_param(s, ca, 0)) {
                if (check_flags) {
                    rv &= ~CERT_PKEY_CA_PARAM;
                    break;
                } else
                    goto end;
            }
        }
    }
    if (!s->server && strict_mode) {
        STACK_OF(X509_NAME) *ca_dn;
        int check_type = 0;
        switch (EVP_PKEY_id(pk)) {
        case EVP_PKEY_RSA:
            check_type = TLS_CT_RSA_SIGN;
            break;
        case EVP_PKEY_DSA:
            check_type = TLS_CT_DSS_SIGN;
            break;
        case EVP_PKEY_EC:
            check_type = TLS_CT_ECDSA_SIGN;
            break;
        }
        if (check_type) {
            const unsigned char *ctypes;
            int ctypelen;
            if (c->ctypes) {
                ctypes = c->ctypes;
                ctypelen = (int)c->ctype_num;
            } else {
                ctypes = (unsigned char *)s->s3->tmp.ctype;
                ctypelen = s->s3->tmp.ctype_num;
            }
            for (i = 0; i < ctypelen; i++) {
                if (ctypes[i] == check_type) {
                    rv |= CERT_PKEY_CERT_TYPE;
                    break;
                }
            }
            if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
                goto end;
        } else
            rv |= CERT_PKEY_CERT_TYPE;

        ca_dn = s->s3->tmp.ca_names;

        if (!sk_X509_NAME_num(ca_dn))
            rv |= CERT_PKEY_ISSUER_NAME;

        if (!(rv & CERT_PKEY_ISSUER_NAME)) {
            if (ssl_check_ca_name(ca_dn, x))
                rv |= CERT_PKEY_ISSUER_NAME;
        }
        if (!(rv & CERT_PKEY_ISSUER_NAME)) {
            for (i = 0; i < sk_X509_num(chain); i++) {
                X509 *xtmp = sk_X509_value(chain, i);
                if (ssl_check_ca_name(ca_dn, xtmp)) {
                    rv |= CERT_PKEY_ISSUER_NAME;
                    break;
                }
            }
        }
        if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
            goto end;
    } else
        rv |= CERT_PKEY_ISSUER_NAME | CERT_PKEY_CERT_TYPE;

    if (!check_flags || (rv & check_flags) == check_flags)
        rv |= CERT_PKEY_VALID;

 end:

    if (TLS1_get_version(s) >= TLS1_2_VERSION) {
        if (*pvalid & CERT_PKEY_EXPLICIT_SIGN)
            rv |= CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
        else if (s->s3->tmp.md[idx] != NULL)
            rv |= CERT_PKEY_SIGN;
    } else
        rv |= CERT_PKEY_SIGN | CERT_PKEY_EXPLICIT_SIGN;

    /*
     * When checking a CERT_PKEY structure all flags are irrelevant if the
     * chain is invalid.
     */
    if (!check_flags) {
        if (rv & CERT_PKEY_VALID)
            *pvalid = rv;
        else {
            /* Preserve explicit sign flag, clear rest */
            *pvalid &= CERT_PKEY_EXPLICIT_SIGN;
            return 0;
        }
    }
    return rv;
}

Project: openssl

static int tls1_check_duplicate_extensions(const PACKET *packet)
{
    PACKET extensions = *packet;
    size_t num_extensions = 0, i = 0;
    unsigned int *extension_types = NULL;
    int ret = 0;

    /* First pass: count the extensions. */
    while (PACKET_remaining(&extensions) > 0) {
        unsigned int type;
        PACKET extension;
        if (!PACKET_get_net_2(&extensions, &type) ||
            !PACKET_get_length_prefixed_2(&extensions, &extension)) {
            goto done;
        }
        num_extensions++;
    }

    if (num_extensions <= 1)
        return 1;

    extension_types = OPENSSL_malloc(sizeof(unsigned int) * num_extensions);
    if (extension_types == NULL) {
        SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_MALLOC_FAILURE);
        goto done;
    }

    /* Second pass: gather the extension types. */
    extensions = *packet;
    for (i = 0; i < num_extensions; i++) {
        PACKET extension;
        if (!PACKET_get_net_2(&extensions, &extension_types[i]) ||
            !PACKET_get_length_prefixed_2(&extensions, &extension)) {
            /* This should not happen. */
            SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_INTERNAL_ERROR);
            goto done;
        }
    }

    if (PACKET_remaining(&extensions) != 0) {
        SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_INTERNAL_ERROR);
        goto done;
    }
    /* Sort the extensions and make sure there are no duplicates. */
    qsort(extension_types, num_extensions, sizeof(unsigned int), compare_uint);
    for (i = 1; i < num_extensions; i++) {
        if (extension_types[i - 1] == extension_types[i])
            goto done;
    }
    ret = 1;
 done:
    OPENSSL_free(extension_types);
    return ret;
}

Project: openssl

static int tls1_check_ec_key(SSL *s,
                             unsigned char *curve_id, unsigned char *comp_id)
{
    const unsigned char *pformats, *pcurves;
    size_t num_formats, num_curves, i;
    int j;
    /*
     * If point formats extension present check it, otherwise everything is
     * supported (see RFC4492).
     */
    if (comp_id && s->session->tlsext_ecpointformatlist) {
        pformats = s->session->tlsext_ecpointformatlist;
        num_formats = s->session->tlsext_ecpointformatlist_length;
        for (i = 0; i < num_formats; i++, pformats++) {
            if (*comp_id == *pformats)
                break;
        }
        if (i == num_formats)
            return 0;
    }
    if (!curve_id)
        return 1;
    /* Check curve is consistent with client and server preferences */
    for (j = 0; j <= 1; j++) {
        if (!tls1_get_curvelist(s, j, &pcurves, &num_curves))
            return 0;
        if (j == 1 && num_curves == 0) {
            /*
             * If we've not received any curves then skip this check.
             * RFC 4492 does not require the supported elliptic curves extension
             * so if it is not sent we can just choose any curve.
             * It is invalid to send an empty list in the elliptic curves
             * extension, so num_curves == 0 always means no extension.
             */
            break;
        }
        for (i = 0; i < num_curves; i++, pcurves += 2) {
            if (pcurves[0] == curve_id[0] && pcurves[1] == curve_id[1])
                break;
        }
        if (i == num_curves)
            return 0;
        /* For clients can only check sent curve list */
        if (!s->server)
            break;
    }
    return 1;
}

Project: openssl

int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
{
    /*
     * If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other
     * curves permitted.
     */
    if (tls1_suiteb(s)) {
        unsigned char curve_id[2];
        /* Curve to check determined by ciphersuite */
        if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
            curve_id[1] = TLSEXT_curve_P_256;
        else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
            curve_id[1] = TLSEXT_curve_P_384;
        else
            return 0;
        curve_id[0] = 0;
        /* Check this curve is acceptable */
        if (!tls1_check_ec_key(s, curve_id, NULL))
            return 0;
        return 1;
    }
    /* Need a shared curve */
    if (tls1_shared_curve(s, 0))
        return 1;
    return 0;
}

Project: openssl

int tls1_ec_curve_id2nid(int curve_id, unsigned int *pflags)
{
    const tls_curve_info *cinfo;
    /* ECC curves from RFC 4492 and RFC 7027 */
    if ((curve_id < 1) || ((unsigned int)curve_id > OSSL_NELEM(nid_list)))
        return 0;
    cinfo = nid_list + curve_id - 1;
    if (pflags)
        *pflags = cinfo->flags;
    return cinfo->nid;
}

Project: openssl

int tls1_ec_nid2curve_id(int nid)
{
    size_t i;
    for (i = 0; i < OSSL_NELEM(nid_list); i++) {
        if (nid_list[i].nid == nid)
            return i + 1;
    }
    return 0;
}

Project: openssl

void tls1_free(SSL *s)
{
    OPENSSL_free(s->tlsext_session_ticket);
    ssl3_free(s);
}

Project: openssl

static int tls1_get_curvelist(SSL *s, int sess,
                              const unsigned char **pcurves, size_t *num_curves)
{
    size_t pcurveslen = 0;
    if (sess) {
        *pcurves = s->session->tlsext_ellipticcurvelist;
        pcurveslen = s->session->tlsext_ellipticcurvelist_length;
    } else {
        /* For Suite B mode only include P-256, P-384 */
        switch (tls1_suiteb(s)) {
        case SSL_CERT_FLAG_SUITEB_128_LOS:
            *pcurves = suiteb_curves;
            pcurveslen = sizeof(suiteb_curves);
            break;

        case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
            *pcurves = suiteb_curves;
            pcurveslen = 2;
            break;

        case SSL_CERT_FLAG_SUITEB_192_LOS:
            *pcurves = suiteb_curves + 2;
            pcurveslen = 2;
            break;
        default:
            *pcurves = s->tlsext_ellipticcurvelist;
            pcurveslen = s->tlsext_ellipticcurvelist_length;
        }
        if (!*pcurves) {
            *pcurves = eccurves_default;
            pcurveslen = sizeof(eccurves_default);
        }
    }

    /* We do not allow odd length arrays to enter the system. */
    if (pcurveslen & 1) {
        SSLerr(SSL_F_TLS1_GET_CURVELIST, ERR_R_INTERNAL_ERROR);
        *num_curves = 0;
        return 0;
    } else {
        *num_curves = pcurveslen / 2;
        return 1;
    }
}

Project: openssl

static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
                               int *psignhash_nid, const unsigned char *data)
{
    int sign_nid = NID_undef, hash_nid = NID_undef;
    if (!phash_nid && !psign_nid && !psignhash_nid)
        return;
    if (phash_nid || psignhash_nid) {
        hash_nid = tls12_find_nid(data[0], tls12_md, OSSL_NELEM(tls12_md));
        if (phash_nid)
            *phash_nid = hash_nid;
    }
    if (psign_nid || psignhash_nid) {
        sign_nid = tls12_find_nid(data[1], tls12_sig, OSSL_NELEM(tls12_sig));
        if (psign_nid)
            *psign_nid = sign_nid;
    }
    if (psignhash_nid) {
        if (sign_nid == NID_undef || hash_nid == NID_undef
            || OBJ_find_sigid_by_algs(psignhash_nid, hash_nid, sign_nid) <= 0)
            *psignhash_nid = NID_undef;
    }
}

Project: openssl

int tls1_save_sigalgs(SSL *s, const unsigned char *data, int dsize)
{
    CERT *c = s->cert;
    /* Extension ignored for inappropriate versions */
    if (!SSL_USE_SIGALGS(s))
        return 1;
    /* Should never happen */
    if (!c)
        return 0;

    OPENSSL_free(s->s3->tmp.peer_sigalgs);
    s->s3->tmp.peer_sigalgs = OPENSSL_malloc(dsize);
    if (s->s3->tmp.peer_sigalgs == NULL)
        return 0;
    s->s3->tmp.peer_sigalgslen = dsize;
    memcpy(s->s3->tmp.peer_sigalgs, data, dsize);
    return 1;
}

Project: openssl

void tls1_set_cert_validity(SSL *s)
{
    tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
    tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
    tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
    tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
    tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST01);
    tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_256);
    tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_512);
}

Project: openssl

int tls1_set_curves(unsigned char **pext, size_t *pextlen,
                    int *curves, size_t ncurves)
{
    unsigned char *clist, *p;
    size_t i;
    /*
     * Bitmap of curves included to detect duplicates: only works while curve
     * ids < 32
     */
    unsigned long dup_list = 0;
    clist = OPENSSL_malloc(ncurves * 2);
    if (clist == NULL)
        return 0;
    for (i = 0, p = clist; i < ncurves; i++) {
        unsigned long idmask;
        int id;
        id = tls1_ec_nid2curve_id(curves[i]);
        idmask = 1L << id;
        if (!id || (dup_list & idmask)) {
            OPENSSL_free(clist);
            return 0;
        }
        dup_list |= idmask;
        s2n(id, p);
    }
    OPENSSL_free(*pext);
    *pext = clist;
    *pextlen = ncurves * 2;
    return 1;
}

Project: openssl

static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
                          EC_KEY *ec)
{
    int id;
    const EC_GROUP *grp;
    if (!ec)
        return 0;
    /* Determine if it is a prime field */
    grp = EC_KEY_get0_group(ec);
    if (!grp)
        return 0;
    /* Determine curve ID */
    id = EC_GROUP_get_curve_name(grp);
    id = tls1_ec_nid2curve_id(id);
    /* If no id return error: we don't support arbitrary explicit curves */
    if (id == 0)
        return 0;
    curve_id[0] = 0;
    curve_id[1] = (unsigned char)id;
    if (comp_id) {
        if (EC_KEY_get0_public_key(ec) == NULL)
            return 0;
        if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_UNCOMPRESSED) {
            *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
        } else {
            if ((nid_list[id - 1].flags & TLS_CURVE_TYPE) == TLS_CURVE_PRIME)
                *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
            else
                *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
        }
    }
    return 1;
}

Project: openssl

int tls1_set_server_sigalgs(SSL *s)
{
    int al;
    size_t i;

    /* Clear any shared signature algorithms */
    OPENSSL_free(s->cert->shared_sigalgs);
    s->cert->shared_sigalgs = NULL;
    s->cert->shared_sigalgslen = 0;
    /* Clear certificate digests and validity flags */
    for (i = 0; i < SSL_PKEY_NUM; i++) {
        s->s3->tmp.md[i] = NULL;
        s->s3->tmp.valid_flags[i] = 0;
    }

    /* If sigalgs received process it. */
    if (s->s3->tmp.peer_sigalgs) {
        if (!tls1_process_sigalgs(s)) {
            SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS, ERR_R_MALLOC_FAILURE);
            al = SSL_AD_INTERNAL_ERROR;
            goto err;
        }
        /* Fatal error is no shared signature algorithms */
        if (!s->cert->shared_sigalgs) {
            SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS,
                   SSL_R_NO_SHARED_SIGNATURE_ALGORITHMS);
            al = SSL_AD_ILLEGAL_PARAMETER;
            goto err;
        }
    } else {
        ssl_set_default_md(s);
    }
    return 1;
 err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
    return 0;
}

Project: openssl

static int tls1_set_shared_sigalgs(SSL *s)
{
    const unsigned char *pref, *allow, *conf;
    size_t preflen, allowlen, conflen;
    size_t nmatch;
    TLS_SIGALGS *salgs = NULL;
    CERT *c = s->cert;
    unsigned int is_suiteb = tls1_suiteb(s);

    OPENSSL_free(c->shared_sigalgs);
    c->shared_sigalgs = NULL;
    c->shared_sigalgslen = 0;
    /* If client use client signature algorithms if not NULL */
    if (!s->server && c->client_sigalgs && !is_suiteb) {
        conf = c->client_sigalgs;
        conflen = c->client_sigalgslen;
    } else if (c->conf_sigalgs && !is_suiteb) {
        conf = c->conf_sigalgs;
        conflen = c->conf_sigalgslen;
    } else
        conflen = tls12_get_psigalgs(s, &conf);
    if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb) {
        pref = conf;
        preflen = conflen;
        allow = s->s3->tmp.peer_sigalgs;
        allowlen = s->s3->tmp.peer_sigalgslen;
    } else {
        allow = conf;
        allowlen = conflen;
        pref = s->s3->tmp.peer_sigalgs;
        preflen = s->s3->tmp.peer_sigalgslen;
    }
    nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen);
    if (nmatch) {
        salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
        if (salgs == NULL)
            return 0;
        nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen);
    } else {
        salgs = NULL;
    }
    c->shared_sigalgs = salgs;
    c->shared_sigalgslen = nmatch;
    return 1;
}

Project: openssl

int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
{
    unsigned char *sigalgs, *sptr;
    int rhash, rsign;
    size_t i;
    if (salglen & 1)
        return 0;
    sigalgs = OPENSSL_malloc(salglen);
    if (sigalgs == NULL)
        return 0;
    for (i = 0, sptr = sigalgs; i < salglen; i += 2) {
        rhash = tls12_find_id(*psig_nids++, tls12_md, OSSL_NELEM(tls12_md));
        rsign = tls12_find_id(*psig_nids++, tls12_sig, OSSL_NELEM(tls12_sig));

        if (rhash == -1 || rsign == -1)
            goto err;
        *sptr++ = rhash;
        *sptr++ = rsign;
    }

    if (client) {
        OPENSSL_free(c->client_sigalgs);
        c->client_sigalgs = sigalgs;
        c->client_sigalgslen = salglen;
    } else {
        OPENSSL_free(c->conf_sigalgs);
        c->conf_sigalgs = sigalgs;
        c->conf_sigalgslen = salglen;
    }

    return 1;

 err:
    OPENSSL_free(sigalgs);
    return 0;
}

Project: openssl

int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
{
    sig_cb_st sig;
    sig.sigalgcnt = 0;
    if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
        return 0;
    if (c == NULL)
        return 1;
    return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
}

Project: openssl

int tls1_shared_curve(SSL *s, int nmatch)
{
    const unsigned char *pref, *supp;
    size_t num_pref, num_supp, i, j;
    int k;
    /* Can't do anything on client side */
    if (s->server == 0)
        return -1;
    if (nmatch == -2) {
        if (tls1_suiteb(s)) {
            /*
             * For Suite B ciphersuite determines curve: we already know
             * these are acceptable due to previous checks.
             */
            unsigned long cid = s->s3->tmp.new_cipher->id;
            if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
                return NID_X9_62_prime256v1; /* P-256 */
            if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
                return NID_secp384r1; /* P-384 */
            /* Should never happen */
            return NID_undef;
        }
        /* If not Suite B just return first preference shared curve */
        nmatch = 0;
    }
    /*
     * Avoid truncation. tls1_get_curvelist takes an int
     * but s->options is a long...
     */
    if (!tls1_get_curvelist
        (s, (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0, &supp,
         &num_supp))
        /* In practice, NID_undef == 0 but let's be precise. */
        return nmatch == -1 ? 0 : NID_undef;
    if (!tls1_get_curvelist
        (s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE), &pref, &num_pref))
        return nmatch == -1 ? 0 : NID_undef;

    /*
     * If the client didn't send the elliptic_curves extension all of them
     * are allowed.
     */
    if (num_supp == 0 && (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0) {
        supp = eccurves_all;
        num_supp = sizeof(eccurves_all) / 2;
    } else if (num_pref == 0 &&
               (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) == 0) {
        pref = eccurves_all;
        num_pref = sizeof(eccurves_all) / 2;
    }

    k = 0;
    for (i = 0; i < num_pref; i++, pref += 2) {
        const unsigned char *tsupp = supp;
        for (j = 0; j < num_supp; j++, tsupp += 2) {
            if (pref[0] == tsupp[0] && pref[1] == tsupp[1]) {
                if (!tls_curve_allowed(s, pref, SSL_SECOP_CURVE_SHARED))
                    continue;
                if (nmatch == k) {
                    int id = (pref[0] << 8) | pref[1];
                    return tls1_ec_curve_id2nid(id, NULL);
                }
                k++;
            }
        }
    }
    if (nmatch == -1)
        return k;
    /* Out of range (nmatch > k). */
    return NID_undef;
}

Project: openssl

int tls_check_serverhello_tlsext_early(SSL *s, const PACKET *ext,
                                       const PACKET *session_id,
                                       SSL_SESSION **ret)
{
    unsigned int i;
    PACKET local_ext = *ext;
    int retv = -1;

    int have_ticket = 0;
    int use_ticket = tls_use_ticket(s);

    *ret = NULL;
    s->tlsext_ticket_expected = 0;
    s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS;

    /*
     * If tickets disabled behave as if no ticket present to permit stateful
     * resumption.
     */
    if ((s->version <= SSL3_VERSION))
        return 0;

    if (!PACKET_get_net_2(&local_ext, &i)) {
        retv = 0;
        goto end;
    }
    while (PACKET_remaining(&local_ext) >= 4) {
        unsigned int type, size;

        if (!PACKET_get_net_2(&local_ext, &type)
            || !PACKET_get_net_2(&local_ext, &size)) {
            /* Shouldn't ever happen */
            retv = -1;
            goto end;
        }
        if (PACKET_remaining(&local_ext) < size) {
            retv = 0;
            goto end;
        }
        if (type == TLSEXT_TYPE_session_ticket && use_ticket) {
            int r;
            const unsigned char *etick;

            /* Duplicate extension */
            if (have_ticket != 0) {
                retv = -1;
                goto end;
            }
            have_ticket = 1;

            if (size == 0) {
                /*
                 * The client will accept a ticket but doesn't currently have
                 * one.
                 */
                s->tlsext_ticket_expected = 1;
                retv = 1;
                continue;
            }
            if (s->tls_session_secret_cb) {
                /*
                 * Indicate that the ticket couldn't be decrypted rather than
                 * generating the session from ticket now, trigger
                 * abbreviated handshake based on external mechanism to
                 * calculate the master secret later.
                 */
                retv = 2;
                continue;
            }
            if (!PACKET_get_bytes(&local_ext, &etick, size)) {
                /* Shouldn't ever happen */
                retv = -1;
                goto end;
            }
            r = tls_decrypt_ticket(s, etick, size, PACKET_data(session_id),
                                   PACKET_remaining(session_id), ret);
            switch (r) {
            case 2:            /* ticket couldn't be decrypted */
                s->tlsext_ticket_expected = 1;
                retv = 2;
                break;
            case 3:            /* ticket was decrypted */
                retv = r;
                break;
            case 4:            /* ticket decrypted but need to renew */
                s->tlsext_ticket_expected = 1;
                retv = 3;
                break;
            default:           /* fatal error */
                retv = -1;
                break;
            }
            continue;
        } else {
            if (type == TLSEXT_TYPE_extended_master_secret)
                s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
            if (!PACKET_forward(&local_ext, size)) {
                retv = -1;
                goto end;
            }
        }
    }
    if (have_ticket == 0)
        retv = 0;
 end:
    return retv;
}

Project: openssl

static int tls_curve_allowed(SSL *s, const unsigned char *curve, int op)
{
    const tls_curve_info *cinfo;
    if (curve[0])
        return 1;
    if ((curve[1] < 1) || ((size_t)curve[1] > OSSL_NELEM(nid_list)))
        return 0;
    cinfo = &nid_list[curve[1] - 1];
# ifdef OPENSSL_NO_EC2M
    if (cinfo->flags & TLS_CURVE_CHAR2)
        return 0;
# endif
    return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)curve);
}

Project: openssl

static int tls_use_ticket(SSL *s)
{
    if (s->options & SSL_OP_NO_TICKET)
        return 0;
    return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
}