Commit message: Fix for CVE-2015-0291

If a client renegotiates using an invalid signature algorithms extension
it will crash a server with a NULL pointer dereference.

Thanks to David Ramos of Stanford University for reporting this bug.

CVE-2015-0291

Reviewed-by: Tim Hudson <tjh@openssl.org>

Conflicts:
	ssl/t1_lib.c
CVE: CVE-2015-0291
CWE: NVD-CWE-Other
Vulnerability description: The sigalgs implementation in t1_lib.c in OpenSSL 1.0.2 before 1.0.2a allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) by using an invalid signature_algorithms extension in the ClientHello message during a renegotiation.

Project: openssl

int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
{
    return tls1_check_chain(s, x, pk, chain, -1);
}

Project: openssl

int SSL_get_shared_sigalgs(SSL *s, int idx,
                           int *psign, int *phash, int *psignhash,
                           unsigned char *rsig, unsigned char *rhash)
{
    TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
    if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen)
        return 0;
    shsigalgs += idx;
    if (phash)
        *phash = shsigalgs->hash_nid;
    if (psign)
        *psign = shsigalgs->sign_nid;
    if (psignhash)
        *psignhash = shsigalgs->signandhash_nid;
    if (rsig)
        *rsig = shsigalgs->rsign;
    if (rhash)
        *rhash = shsigalgs->rhash;
    return s->cert->shared_sigalgslen;
}

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->cert->peer_sigalgs;
    if (psig == NULL)
        return 0;
    if (idx >= 0) {
        idx <<= 1;
        if (idx >= (int)s->cert->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->cert->peer_sigalgslen / 2;
}

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, hash_alg;
    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;

    if (!strcmp(etmp, "RSA"))
        sig_alg = EVP_PKEY_RSA;
    else if (!strcmp(etmp, "DSA"))
        sig_alg = EVP_PKEY_DSA;
    else if (!strcmp(etmp, "ECDSA"))
        sig_alg = EVP_PKEY_EC;
    else
        return 0;

    hash_alg = OBJ_sn2nid(p);
    if (hash_alg == NID_undef)
        hash_alg = OBJ_ln2nid(p);
    if (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++) {
            SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);

            alg_k = c->algorithm_mkey;
            alg_a = c->algorithm_auth;
            if ((alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)
                 || (alg_a & SSL_aECDSA))) {
                using_ecc = 1;
                break;
            }
        }
    }
# endif

    /* don't add extensions for SSLv3 unless doing secure renegotiation */
    if (s->client_version == SSL3_VERSION && !s->s3->send_connection_binding)
        return orig;

    ret += 2;

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

    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 entension 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;
    }

    /* 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;
    }
# 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 entension 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;

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

    if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) {
        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)
                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_USE_SIGALGS(s)) {
        size_t salglen;
        const unsigned char *salg;
        salglen = tls12_get_psigalgs(s, &salg);
        if ((size_t)(limit - ret) < salglen + 6)
            return NULL;
        s2n(TLSEXT_TYPE_signature_algorithms, ret);
        s2n(salglen + 2, ret);
        s2n(salglen, ret);
        memcpy(ret, salg, salglen);
        ret += salglen;
    }
# ifdef TLSEXT_TYPE_opaque_prf_input
    if (s->s3->client_opaque_prf_input != NULL) {
        size_t col = s->s3->client_opaque_prf_input_len;

        if ((long)(limit - ret - 6 - col < 0))
            return NULL;
        if (col > 0xFFFD)       /* can't happen */
            return NULL;

        s2n(TLSEXT_TYPE_opaque_prf_input, ret);
        s2n(col + 2, ret);
        s2n(col, ret);
        memcpy(ret, s->s3->client_opaque_prf_input, col);
        ret += col;
    }
# endif

    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);
    }
# ifndef OPENSSL_NO_HEARTBEATS
    /* 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_TLSEXT_HB_DONT_RECV_REQUESTS)
        *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
    else
        *(ret++) = SSL_TLSEXT_HB_ENABLED;
# endif

# ifndef OPENSSL_NO_NEXTPROTONEG
    if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len) {
        /*
         * The client advertises an emtpy 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

    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;
    }
# ifndef OPENSSL_NO_SRTP
    if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)) {
        int el;

        ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);

        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;

    /*
     * 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;
        /*
         * The code in s23_clnt.c to build ClientHello messages includes the
         * 5-byte record header in the buffer, while the code in s3_clnt.c
         * does not.
         */
        if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
            hlen -= 5;
        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;
        }
    }

    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_kEECDH | SSL_kECDHr | SSL_kECDHe))
        || (alg_a & SSL_aECDSA);
    using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
# endif
    /*
     * don't add extensions for SSLv3, unless doing secure renegotiation
     */
    if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
        return orig;

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

    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);
    }

    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;
    }
# 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 && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) {
        if ((long)(limit - ret - 4) < 0)
            return NULL;
        s2n(TLSEXT_TYPE_session_ticket, ret);
        s2n(0, ret);
    }

    if (s->tlsext_status_expected) {
        if ((long)(limit - ret - 4) < 0)
            return NULL;
        s2n(TLSEXT_TYPE_status_request, ret);
        s2n(0, ret);
    }
# ifdef TLSEXT_TYPE_opaque_prf_input
    if (s->s3->server_opaque_prf_input != NULL) {
        size_t sol = s->s3->server_opaque_prf_input_len;

        if ((long)(limit - ret - 6 - sol) < 0)
            return NULL;
        if (sol > 0xFFFD)       /* can't happen */
            return NULL;

        s2n(TLSEXT_TYPE_opaque_prf_input, ret);
        s2n(sol + 2, ret);
        s2n(sol, ret);
        memcpy(ret, s->s3->server_opaque_prf_input, sol);
        ret += sol;
    }
# endif

# ifndef OPENSSL_NO_SRTP
    if (SSL_IS_DTLS(s) && s->srtp_profile) {
        int el;

        ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);

        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 (s->tlsext_heartbeat & SSL_TLSEXT_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_TLSEXT_HB_DONT_RECV_REQUESTS)
            *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
        else
            *(ret++) = SSL_TLSEXT_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->alpn_selected) {
        const unsigned char *selected = s->s3->alpn_selected;
        unsigned 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;
    }

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

    s2n(extdatalen, orig);
    return ret;
}

Project: openssl

int ssl_check_clienthello_tlsext_late(SSL *s)
{
    int ret = SSL_TLSEXT_ERR_OK;
    int al;

    /*
     * 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 r;
        CERT_PKEY *certpkey;
        certpkey = ssl_get_server_send_pkey(s);
        /* If no certificate can't return certificate status */
        if (certpkey == NULL) {
            s->tlsext_status_expected = 0;
            return 1;
        }
        /*
         * Set current certificate to one we will use so SSL_get_certificate
         * et al can pick it up.
         */
        s->cert->key = certpkey;
        r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
        switch (r) {
            /* We don't want to send a status request response */
        case SSL_TLSEXT_ERR_NOACK:
            s->tlsext_status_expected = 0;
            break;
            /* status request response should be sent */
        case SSL_TLSEXT_ERR_OK:
            if (s->tlsext_ocsp_resp)
                s->tlsext_status_expected = 1;
            else
                s->tlsext_status_expected = 0;
            break;
            /* something bad happened */
        case SSL_TLSEXT_ERR_ALERT_FATAL:
            ret = SSL_TLSEXT_ERR_ALERT_FATAL;
            al = SSL_AD_INTERNAL_ERROR;
            goto err;
        }
    } else
        s->tlsext_status_expected = 0;

 err:
    switch (ret) {
    case SSL_TLSEXT_ERR_ALERT_FATAL:
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
        return -1;

    case SSL_TLSEXT_ERR_ALERT_WARNING:
        ssl3_send_alert(s, SSL3_AL_WARNING, al);
        return 1;

    default:
        return 1;
    }
}

Project: openssl

static void ssl_check_for_safari(SSL *s, const unsigned char *data,
                                 const unsigned char *d, int n)
{
    unsigned short type, size;
    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 */
    static const unsigned char kSafariTLS12ExtensionsBlock[] = {
        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 */
    };

    if (data >= (d + n - 2))
        return;
    data += 2;

    if (data > (d + n - 4))
        return;
    n2s(data, type);
    n2s(data, size);

    if (type != TLSEXT_TYPE_server_name)
        return;

    if (data + size > d + n)
        return;
    data += size;

    if (TLS1_get_client_version(s) >= TLS1_2_VERSION) {
        const size_t len1 = sizeof(kSafariExtensionsBlock);
        const size_t len2 = sizeof(kSafariTLS12ExtensionsBlock);

        if (data + len1 + len2 != d + n)
            return;
        if (memcmp(data, kSafariExtensionsBlock, len1) != 0)
            return;
        if (memcmp(data + len1, kSafariTLS12ExtensionsBlock, len2) != 0)
            return;
    } else {
        const size_t len = sizeof(kSafariExtensionsBlock);

        if (data + len != d + n)
            return;
        if (memcmp(data, kSafariExtensionsBlock, len) != 0)
            return;
    }

    s->s3->is_probably_safari = 1;
}

Project: openssl

int ssl_check_serverhello_tlsext(SSL *s)
{
    int ret = SSL_TLSEXT_ERR_NOACK;
    int al = SSL_AD_UNRECOGNIZED_NAME;

# ifndef OPENSSL_NO_EC
    /*
     * If we are client and using an elliptic curve cryptography cipher
     * suite, then if server returns an EC point formats lists extension it
     * must contain uncompressed.
     */
    unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
    unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
    if ((s->tlsext_ecpointformatlist != NULL)
        && (s->tlsext_ecpointformatlist_length > 0)
        && (s->session->tlsext_ecpointformatlist != NULL)
        && (s->session->tlsext_ecpointformatlist_length > 0)
        && ((alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe))
            || (alg_a & SSL_aECDSA))) {
        /* we are using an ECC cipher */
        size_t i;
        unsigned char *list;
        int found_uncompressed = 0;
        list = s->session->tlsext_ecpointformatlist;
        for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) {
            if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) {
                found_uncompressed = 1;
                break;
            }
        }
        if (!found_uncompressed) {
            SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,
                   SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
            return -1;
        }
    }
    ret = SSL_TLSEXT_ERR_OK;
# endif                         /* OPENSSL_NO_EC */

    if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
        ret =
            s->ctx->tlsext_servername_callback(s, &al,
                                               s->ctx->tlsext_servername_arg);
    else if (s->initial_ctx != NULL
             && s->initial_ctx->tlsext_servername_callback != 0)
        ret =
            s->initial_ctx->tlsext_servername_callback(s, &al,
                                                       s->
                                                       initial_ctx->tlsext_servername_arg);

# ifdef TLSEXT_TYPE_opaque_prf_input
    if (s->s3->server_opaque_prf_input_len > 0) {
        /*
         * This case may indicate that we, as a client, want to insist on
         * using opaque PRF inputs. So first verify that we really have a
         * value from the server too.
         */

        if (s->s3->server_opaque_prf_input == NULL) {
            ret = SSL_TLSEXT_ERR_ALERT_FATAL;
            al = SSL_AD_HANDSHAKE_FAILURE;
        }

        /*
         * Anytime the server *has* sent an opaque PRF input, we need to
         * check that we have a client opaque PRF input of the same size.
         */
        if (s->s3->client_opaque_prf_input == NULL ||
            s->s3->client_opaque_prf_input_len !=
            s->s3->server_opaque_prf_input_len) {
            ret = SSL_TLSEXT_ERR_ALERT_FATAL;
            al = SSL_AD_ILLEGAL_PARAMETER;
        }
    }
# endif

    /*
     * If we've requested certificate status and we wont get one tell the
     * callback
     */
    if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
        && s->ctx && s->ctx->tlsext_status_cb) {
        int r;
        /*
         * Set resp to NULL, resplen to -1 so callback knows there is no
         * response.
         */
        if (s->tlsext_ocsp_resp) {
            OPENSSL_free(s->tlsext_ocsp_resp);
            s->tlsext_ocsp_resp = NULL;
        }
        s->tlsext_ocsp_resplen = -1;
        r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
        if (r == 0) {
            al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
            ret = SSL_TLSEXT_ERR_ALERT_FATAL;
        }
        if (r < 0) {
            al = SSL_AD_INTERNAL_ERROR;
            ret = SSL_TLSEXT_ERR_ALERT_FATAL;
        }
    }

    switch (ret) {
    case SSL_TLSEXT_ERR_ALERT_FATAL:
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
        return -1;

    case SSL_TLSEXT_ERR_ALERT_WARNING:
        ssl3_send_alert(s, SSL3_AL_WARNING, al);
        return 1;

    case SSL_TLSEXT_ERR_NOACK:
        s->servername_done = 0;
    default:
        return 1;
    }
}

Project: openssl

static char ssl_next_proto_validate(unsigned char *d, unsigned len)
{
    unsigned int off = 0;

    while (off < len) {
        if (d[off] == 0)
            return 0;
        off += d[off];
        off++;
    }

    return off == len;
}

Project: openssl

int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d,
                                 int n)
{
    int al = -1;
    unsigned char *ptmp = *p;
    /*
     * Internally supported extensions are parsed first so SNI can be handled
     * before custom extensions. An application processing SNI will typically
     * switch the parent context using SSL_set_SSL_CTX and custom extensions
     * need to be handled by the new SSL_CTX structure.
     */
    if (ssl_scan_clienthello_tlsext(s, p, d, n, &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;
    }

    custom_ext_init(&s->cert->srv_ext);
    if (ssl_scan_clienthello_custom_tlsext(s, ptmp, d + n, &al) <= 0) {
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
        return 0;
    }

    return 1;
}

Project: openssl

int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d,
                                 int n)
{
    int al = -1;
    if (s->version < SSL3_VERSION)
        return 1;
    if (ssl_scan_serverhello_tlsext(s, p, d, n, &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)
{

# ifdef TLSEXT_TYPE_opaque_prf_input
    {
        int r = 1;

        if (s->ctx->tlsext_opaque_prf_input_callback != 0) {
            r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0,
                                                         s->
                                                         ctx->tlsext_opaque_prf_input_callback_arg);
            if (!r)
                return -1;
        }

        if (s->tlsext_opaque_prf_input != NULL) {
            if (s->s3->client_opaque_prf_input != NULL) {
                /* shouldn't really happen */
                OPENSSL_free(s->s3->client_opaque_prf_input);
            }

            if (s->tlsext_opaque_prf_input_len == 0) {
                /* dummy byte just to get non-NULL */
                s->s3->client_opaque_prf_input = OPENSSL_malloc(1);
            } else {
                s->s3->client_opaque_prf_input =
                    BUF_memdup(s->tlsext_opaque_prf_input,
                               s->tlsext_opaque_prf_input_len);
            }
            if (s->s3->client_opaque_prf_input == NULL) {
                SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,
                       ERR_R_MALLOC_FAILURE);
                return -1;
            }
            s->s3->client_opaque_prf_input_len =
                s->tlsext_opaque_prf_input_len;
        }

        if (r == 2)
            /*
             * at callback's request, insist on receiving an appropriate
             * server opaque PRF input
             */
            s->s3->server_opaque_prf_input_len =
                s->tlsext_opaque_prf_input_len;
    }
# endif

    return 1;
}

Project: openssl

int ssl_prepare_serverhello_tlsext(SSL *s)
{
    return 1;
}

Project: openssl

static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p,
                                       unsigned char *d, int n, int *al)
{
    unsigned short type;
    unsigned short size;
    unsigned short len;
    unsigned char *data = *p;
    int renegotiate_seen = 0;

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

    if (s->s3->alpn_selected) {
        OPENSSL_free(s->s3->alpn_selected);
        s->s3->alpn_selected = NULL;
    }
# ifndef OPENSSL_NO_HEARTBEATS
    s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
                             SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
# endif

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

    /* Clear any signature algorithms extension received */
    if (s->cert->peer_sigalgs) {
        OPENSSL_free(s->cert->peer_sigalgs);
        s->cert->peer_sigalgs = NULL;
    }
# ifndef OPENSSL_NO_SRP
    if (s->srp_ctx.login != NULL) {
        OPENSSL_free(s->srp_ctx.login);
        s->srp_ctx.login = NULL;
    }
# endif

    s->srtp_profile = NULL;

    if (data >= (d + n - 2))
        goto ri_check;
    n2s(data, len);

    if (data > (d + n - len))
        goto ri_check;

    while (data <= (d + n - 4)) {
        n2s(data, type);
        n2s(data, size);

        if (data + size > (d + n))
            goto ri_check;
# if 0
        fprintf(stderr, "Received extension type %d size %d\n", type, size);
# endif
        if (s->tlsext_debug_cb)
            s->tlsext_debug_cb(s, 0, type, data, size, s->tlsext_debug_arg);
/*-
 * 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.
 *
 */

        if (type == TLSEXT_TYPE_server_name) {
            unsigned char *sdata;
            int servname_type;
            int dsize;

            if (size < 2) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
            n2s(data, dsize);
            size -= 2;
            if (dsize > size) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }

            sdata = data;
            while (dsize > 3) {
                servname_type = *(sdata++);
                n2s(sdata, len);
                dsize -= 3;

                if (len > dsize) {
                    *al = SSL_AD_DECODE_ERROR;
                    return 0;
                }
                if (s->servername_done == 0)
                    switch (servname_type) {
                    case TLSEXT_NAMETYPE_host_name:
                        if (!s->hit) {
                            if (s->session->tlsext_hostname) {
                                *al = SSL_AD_DECODE_ERROR;
                                return 0;
                            }
                            if (len > TLSEXT_MAXLEN_host_name) {
                                *al = TLS1_AD_UNRECOGNIZED_NAME;
                                return 0;
                            }
                            if ((s->session->tlsext_hostname =
                                 OPENSSL_malloc(len + 1)) == NULL) {
                                *al = TLS1_AD_INTERNAL_ERROR;
                                return 0;
                            }
                            memcpy(s->session->tlsext_hostname, sdata, len);
                            s->session->tlsext_hostname[len] = '\0';
                            if (strlen(s->session->tlsext_hostname) != len) {
                                OPENSSL_free(s->session->tlsext_hostname);
                                s->session->tlsext_hostname = NULL;
                                *al = TLS1_AD_UNRECOGNIZED_NAME;
                                return 0;
                            }
                            s->servername_done = 1;

                        } else
                            s->servername_done = s->session->tlsext_hostname
                                && strlen(s->session->tlsext_hostname) == len
                                && strncmp(s->session->tlsext_hostname,
                                           (char *)sdata, len) == 0;

                        break;

                    default:
                        break;
                    }

                dsize -= len;
            }
            if (dsize != 0) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }

        }
# ifndef OPENSSL_NO_SRP
        else if (type == TLSEXT_TYPE_srp) {
            if (size <= 0 || ((len = data[0])) != (size - 1)) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
            if (s->srp_ctx.login != NULL) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
            if ((s->srp_ctx.login = OPENSSL_malloc(len + 1)) == NULL)
                return -1;
            memcpy(s->srp_ctx.login, &data[1], len);
            s->srp_ctx.login[len] = '\0';

            if (strlen(s->srp_ctx.login) != len) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
        }
# endif

# ifndef OPENSSL_NO_EC
        else if (type == TLSEXT_TYPE_ec_point_formats) {
            unsigned char *sdata = data;
            int ecpointformatlist_length = *(sdata++);

            if (ecpointformatlist_length != size - 1 ||
                ecpointformatlist_length < 1) {
                *al = TLS1_AD_DECODE_ERROR;
                return 0;
            }
            if (!s->hit) {
                if (s->session->tlsext_ecpointformatlist) {
                    OPENSSL_free(s->session->tlsext_ecpointformatlist);
                    s->session->tlsext_ecpointformatlist = NULL;
                }
                s->session->tlsext_ecpointformatlist_length = 0;
                if ((s->session->tlsext_ecpointformatlist =
                     OPENSSL_malloc(ecpointformatlist_length)) == NULL) {
                    *al = TLS1_AD_INTERNAL_ERROR;
                    return 0;
                }
                s->session->tlsext_ecpointformatlist_length =
                    ecpointformatlist_length;
                memcpy(s->session->tlsext_ecpointformatlist, sdata,
                       ecpointformatlist_length);
            }
#  if 0
            fprintf(stderr,
                    "ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ",
                    s->session->tlsext_ecpointformatlist_length);
            sdata = s->session->tlsext_ecpointformatlist;
            for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
                fprintf(stderr, "%i ", *(sdata++));
            fprintf(stderr, "\n");
#  endif
        } else if (type == TLSEXT_TYPE_elliptic_curves) {
            unsigned char *sdata = data;
            int ellipticcurvelist_length = (*(sdata++) << 8);
            ellipticcurvelist_length += (*(sdata++));

            if (ellipticcurvelist_length != size - 2 ||
                ellipticcurvelist_length < 1 ||
                /* Each NamedCurve is 2 bytes. */
                ellipticcurvelist_length & 1) {
                *al = TLS1_AD_DECODE_ERROR;
                return 0;
            }
            if (!s->hit) {
                if (s->session->tlsext_ellipticcurvelist) {
                    *al = TLS1_AD_DECODE_ERROR;
                    return 0;
                }
                s->session->tlsext_ellipticcurvelist_length = 0;
                if ((s->session->tlsext_ellipticcurvelist =
                     OPENSSL_malloc(ellipticcurvelist_length)) == NULL) {
                    *al = TLS1_AD_INTERNAL_ERROR;
                    return 0;
                }
                s->session->tlsext_ellipticcurvelist_length =
                    ellipticcurvelist_length;
                memcpy(s->session->tlsext_ellipticcurvelist, sdata,
                       ellipticcurvelist_length);
            }
#  if 0
            fprintf(stderr,
                    "ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ",
                    s->session->tlsext_ellipticcurvelist_length);
            sdata = s->session->tlsext_ellipticcurvelist;
            for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
                fprintf(stderr, "%i ", *(sdata++));
            fprintf(stderr, "\n");
#  endif
        }
# endif                         /* OPENSSL_NO_EC */
# ifdef TLSEXT_TYPE_opaque_prf_input
        else if (type == TLSEXT_TYPE_opaque_prf_input) {
            unsigned char *sdata = data;

            if (size < 2) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
            n2s(sdata, s->s3->client_opaque_prf_input_len);
            if (s->s3->client_opaque_prf_input_len != size - 2) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }

            if (s->s3->client_opaque_prf_input != NULL) {
                /* shouldn't really happen */
                OPENSSL_free(s->s3->client_opaque_prf_input);
            }

            /* dummy byte just to get non-NULL */
            if (s->s3->client_opaque_prf_input_len == 0)
                s->s3->client_opaque_prf_input = OPENSSL_malloc(1);
            else
                s->s3->client_opaque_prf_input =
                    BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
            if (s->s3->client_opaque_prf_input == NULL) {
                *al = TLS1_AD_INTERNAL_ERROR;
                return 0;
            }
        }
# endif
        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;
            }
        } else if (type == TLSEXT_TYPE_renegotiate) {
            if (!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
                return 0;
            renegotiate_seen = 1;
        } else if (type == TLSEXT_TYPE_signature_algorithms) {
            int dsize;
            if (s->cert->peer_sigalgs || size < 2) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
            n2s(data, dsize);
            size -= 2;
            if (dsize != size || dsize & 1 || !dsize) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
            if (!tls1_save_sigalgs(s, data, dsize)) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
        } else if (type == TLSEXT_TYPE_status_request) {

            if (size < 5) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }

            s->tlsext_status_type = *data++;
            size--;
            if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) {
                const unsigned char *sdata;
                int dsize;
                /* Read in responder_id_list */
                n2s(data, dsize);
                size -= 2;
                if (dsize > size) {
                    *al = SSL_AD_DECODE_ERROR;
                    return 0;
                }
                while (dsize > 0) {
                    OCSP_RESPID *id;
                    int idsize;
                    if (dsize < 4) {
                        *al = SSL_AD_DECODE_ERROR;
                        return 0;
                    }
                    n2s(data, idsize);
                    dsize -= 2 + idsize;
                    size -= 2 + idsize;
                    if (dsize < 0) {
                        *al = SSL_AD_DECODE_ERROR;
                        return 0;
                    }
                    sdata = data;
                    data += idsize;
                    id = d2i_OCSP_RESPID(NULL, &sdata, idsize);
                    if (!id) {
                        *al = SSL_AD_DECODE_ERROR;
                        return 0;
                    }
                    if (data != sdata) {
                        OCSP_RESPID_free(id);
                        *al = SSL_AD_DECODE_ERROR;
                        return 0;
                    }
                    if (!s->tlsext_ocsp_ids
                        && !(s->tlsext_ocsp_ids =
                             sk_OCSP_RESPID_new_null())) {
                        OCSP_RESPID_free(id);
                        *al = SSL_AD_INTERNAL_ERROR;
                        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 (size < 2) {
                    *al = SSL_AD_DECODE_ERROR;
                    return 0;
                }
                n2s(data, dsize);
                size -= 2;
                if (dsize != size) {
                    *al = SSL_AD_DECODE_ERROR;
                    return 0;
                }
                sdata = data;
                if (dsize > 0) {
                    if (s->tlsext_ocsp_exts) {
                        sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
                                                   X509_EXTENSION_free);
                    }

                    s->tlsext_ocsp_exts =
                        d2i_X509_EXTENSIONS(NULL, &sdata, dsize);
                    if (!s->tlsext_ocsp_exts || (data + dsize != sdata)) {
                        *al = SSL_AD_DECODE_ERROR;
                        return 0;
                    }
                }
            }
            /*
             * We don't know what to do with any other type * so ignore it.
             */
            else
                s->tlsext_status_type = -1;
        }
# ifndef OPENSSL_NO_HEARTBEATS
        else if (type == TLSEXT_TYPE_heartbeat) {
            switch (data[0]) {
            case 0x01:         /* Client allows us to send HB requests */
                s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
                break;
            case 0x02:         /* Client doesn't accept HB requests */
                s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
                s->tlsext_heartbeat |= SSL_TLSEXT_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 &&
                 s->s3->alpn_selected == NULL) {
            /*-
             * 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 renegotation 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->ctx->alpn_select_cb && s->s3->tmp.finish_md_len == 0) {
            if (tls1_alpn_handle_client_hello(s, data, size, al) != 0)
                return 0;
# ifndef OPENSSL_NO_NEXTPROTONEG
            /* ALPN takes precedence over NPN. */
            s->s3->next_proto_neg_seen = 0;
# endif
        }

        /* 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, data, size, al))
                return 0;
        }
# endif

        data += size;
    }

    *p = data;

 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;
    }

    return 1;
}

Project: openssl

static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p,
                                       unsigned char *d, int n, int *al)
{
    unsigned short length;
    unsigned short type;
    unsigned short size;
    unsigned char *data = *p;
    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;

    if (s->s3->alpn_selected) {
        OPENSSL_free(s->s3->alpn_selected);
        s->s3->alpn_selected = NULL;
    }
# ifndef OPENSSL_NO_HEARTBEATS
    s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
                             SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
# endif

    if (data >= (d + n - 2))
        goto ri_check;

    n2s(data, length);
    if (data + length != d + n) {
        *al = SSL_AD_DECODE_ERROR;
        return 0;
    }

    while (data <= (d + n - 4)) {
        n2s(data, type);
        n2s(data, size);

        if (data + size > (d + n))
            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_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 char *sdata = data;
            int ecpointformatlist_length = *(sdata++);

            if (ecpointformatlist_length != size - 1) {
                *al = TLS1_AD_DECODE_ERROR;
                return 0;
            }
            if (!s->hit) {
                s->session->tlsext_ecpointformatlist_length = 0;
                if (s->session->tlsext_ecpointformatlist != NULL)
                    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;
                memcpy(s->session->tlsext_ecpointformatlist, sdata,
                       ecpointformatlist_length);
            }
#  if 0
            fprintf(stderr,
                    "ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
            sdata = s->session->tlsext_ecpointformatlist;
            for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
                fprintf(stderr, "%i ", *(sdata++));
            fprintf(stderr, "\n");
#  endif
        }
# 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 ((SSL_get_options(s) & SSL_OP_NO_TICKET)
                || (size > 0)) {
                *al = TLS1_AD_UNSUPPORTED_EXTENSION;
                return 0;
            }
            s->tlsext_ticket_expected = 1;
        }
# ifdef TLSEXT_TYPE_opaque_prf_input
        else if (type == TLSEXT_TYPE_opaque_prf_input) {
            unsigned char *sdata = data;

            if (size < 2) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
            n2s(sdata, s->s3->server_opaque_prf_input_len);
            if (s->s3->server_opaque_prf_input_len != size - 2) {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }

            if (s->s3->server_opaque_prf_input != NULL) {
                /* shouldn't really happen */
                OPENSSL_free(s->s3->server_opaque_prf_input);
            }
            if (s->s3->server_opaque_prf_input_len == 0) {
                /* dummy byte just to get non-NULL */
                s->s3->server_opaque_prf_input = OPENSSL_malloc(1);
            } else {
                s->s3->server_opaque_prf_input =
                    BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
            }

            if (s->s3->server_opaque_prf_input == NULL) {
                *al = TLS1_AD_INTERNAL_ERROR;
                return 0;
            }
        }
# endif
        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_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(data, size)) {
                *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) {
                *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->alpn_client_proto_list == NULL) {
                *al = TLS1_AD_UNSUPPORTED_EXTENSION;
                return 0;
            }
            if (size < 4) {
                *al = TLS1_AD_DECODE_ERROR;
                return 0;
            }
            /*-
             * The extension data consists of:
             *   uint16 list_length
             *   uint8 proto_length;
             *   uint8 proto[proto_length];
             */
            len = data[0];
            len <<= 8;
            len |= data[1];
            if (len != (unsigned)size - 2) {
                *al = TLS1_AD_DECODE_ERROR;
                return 0;
            }
            len = data[2];
            if (len != (unsigned)size - 3) {
                *al = TLS1_AD_DECODE_ERROR;
                return 0;
            }
            if (s->s3->alpn_selected)
                OPENSSL_free(s->s3->alpn_selected);
            s->s3->alpn_selected = OPENSSL_malloc(len);
            if (!s->s3->alpn_selected) {
                *al = TLS1_AD_INTERNAL_ERROR;
                return 0;
            }
            memcpy(s->s3->alpn_selected, data + 3, len);
            s->s3->alpn_selected_len = len;
        }

        else if (type == TLSEXT_TYPE_renegotiate) {
            if (!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
                return 0;
            renegotiate_seen = 1;
        }
# ifndef OPENSSL_NO_HEARTBEATS
        else if (type == TLSEXT_TYPE_heartbeat) {
            switch (data[0]) {
            case 0x01:         /* Server allows us to send HB requests */
                s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
                break;
            case 0x02:         /* Server doesn't accept HB requests */
                s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
                s->tlsext_heartbeat |= SSL_TLSEXT_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, data, size, al))
                return 0;
        }
# endif
        /*
         * 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;

        data += size;
    }

    if (data != d + n) {
        *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 = BUF_strdup(s->tlsext_hostname);
                if (!s->session->tlsext_hostname) {
                    *al = SSL_AD_UNRECOGNIZED_NAME;
                    return 0;
                }
            } else {
                *al = SSL_AD_DECODE_ERROR;
                return 0;
            }
        }
    }

    *p = data;

 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 on
     * initial connect only.
     */
    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;
    }

    return 1;
}

Project: openssl

void ssl_set_client_disabled(SSL *s)
{
    CERT *c = s->cert;
    const unsigned char *sigalgs;
    size_t i, sigalgslen;
    int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
    c->mask_a = 0;
    c->mask_k = 0;
    /* Don't allow TLS 1.2 only ciphers if we don't suppport them */
    if (!SSL_CLIENT_USE_TLS1_2_CIPHERS(s))
        c->mask_ssl = SSL_TLSV1_2;
    else
        c->mask_ssl = 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.
     */
    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:
            have_rsa = 1;
            break;
# endif
# ifndef OPENSSL_NO_DSA
        case TLSEXT_signature_dsa:
            have_dsa = 1;
            break;
# endif
# ifndef OPENSSL_NO_ECDSA
        case TLSEXT_signature_ecdsa:
            have_ecdsa = 1;
            break;
# endif
        }
    }
    /*
     * Disable auth and static DH if we don't include any appropriate
     * signature algorithms.
     */
    if (!have_rsa) {
        c->mask_a |= SSL_aRSA;
        c->mask_k |= SSL_kDHr | SSL_kECDHr;
    }
    if (!have_dsa) {
        c->mask_a |= SSL_aDSS;
        c->mask_k |= SSL_kDHd;
    }
    if (!have_ecdsa) {
        c->mask_a |= SSL_aECDSA;
        c->mask_k |= SSL_kECDHe;
    }
# ifndef OPENSSL_NO_KRB5
    if (!kssl_tgt_is_available(s->kssl_ctx)) {
        c->mask_a |= SSL_aKRB5;
        c->mask_k |= SSL_kKRB5;
    }
# endif
# ifndef OPENSSL_NO_PSK
    /* with PSK there must be client callback set */
    if (!s->psk_client_callback) {
        c->mask_a |= SSL_aPSK;
        c->mask_k |= SSL_kPSK;
    }
# endif                         /* OPENSSL_NO_PSK */
# ifndef OPENSSL_NO_SRP
    if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) {
        c->mask_a |= SSL_aSRP;
        c->mask_k |= SSL_kSRP;
    }
# endif
    c->valid = 1;
}

Project: openssl

int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s,
                            const unsigned char *sig, EVP_PKEY *pkey)
{
    const unsigned char *sent_sigs;
    size_t sent_sigslen, i;
    int sigalg = tls12_get_sigid(pkey);
    /* Should never happen */
    if (sigalg == -1)
        return -1;
    /* Check key type is consistent with signature */
    if (sigalg != (int)sig[1]) {
        SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
        return 0;
    }
# ifndef OPENSSL_NO_EC
    if (pkey->type == EVP_PKEY_EC) {
        unsigned char curve_id[2], comp_id;
        /* Check compression and curve matches extensions */
        if (!tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec))
            return 0;
        if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id)) {
            SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
            return 0;
        }
        /* If Suite B only P-384+SHA384 or P-256+SHA-256 allowed */
        if (tls1_suiteb(s)) {
            if (curve_id[0])
                return 0;
            if (curve_id[1] == TLSEXT_curve_P_256) {
                if (sig[0] != TLSEXT_hash_sha256) {
                    SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
                           SSL_R_ILLEGAL_SUITEB_DIGEST);
                    return 0;
                }
            } else if (curve_id[1] == TLSEXT_curve_P_384) {
                if (sig[0] != TLSEXT_hash_sha384) {
                    SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
                           SSL_R_ILLEGAL_SUITEB_DIGEST);
                    return 0;
                }
            } else
                return 0;
        }
    } else if (tls1_suiteb(s))
        return 0;
# endif

    /* Check signature matches a type we sent */
    sent_sigslen = tls12_get_psigalgs(s, &sent_sigs);
    for (i = 0; i < sent_sigslen; i += 2, sent_sigs += 2) {
        if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1])
            break;
    }
    /* Allow fallback to SHA1 if not strict mode */
    if (i == sent_sigslen
        && (sig[0] != TLSEXT_hash_sha1
            || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) {
        SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
        return 0;
    }
    *pmd = tls12_get_hash(sig[0]);
    if (*pmd == NULL) {
        SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_UNKNOWN_DIGEST);
        return 0;
    }
    /*
     * Store the digest used so applications can retrieve it if they wish.
     */
    if (s->session && s->session->sess_cert)
        s->session->sess_cert->peer_key->digest = *pmd;
    return 1;
}

Project: openssl

static int tls12_do_shared_sigalgs(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_get_hash(ptmp[0]) == NULL)
            continue;
        if (tls12_get_pkey_idx(ptmp[1]) == -1)
            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 tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
{
    size_t i;
    for (i = 0; i < tlen; i++) {
        if (table[i].nid == nid)
            return table[i].id;
    }
    return -1;
}

Project: openssl

static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
{
    size_t i;
    for (i = 0; i < tlen; i++) {
        if ((table[i].id) == id)
            return table[i].nid;
    }
    return NID_undef;
}

Project: openssl

const EVP_MD *tls12_get_hash(unsigned char hash_alg)
{
    switch (hash_alg) {
# ifndef OPENSSL_NO_MD5
    case TLSEXT_hash_md5:
#  ifdef OPENSSL_FIPS
        if (FIPS_mode())
            return NULL;
#  endif
        return EVP_md5();
# endif
# ifndef OPENSSL_NO_SHA
    case TLSEXT_hash_sha1:
        return EVP_sha1();
# endif
# ifndef OPENSSL_NO_SHA256
    case TLSEXT_hash_sha224:
        return EVP_sha224();

    case TLSEXT_hash_sha256:
        return EVP_sha256();
# endif
# ifndef OPENSSL_NO_SHA512
    case TLSEXT_hash_sha384:
        return EVP_sha384();

    case TLSEXT_hash_sha512:
        return EVP_sha512();
# endif
    default:
        return NULL;

    }
}

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_ECDSA
    case TLSEXT_signature_ecdsa:
        return SSL_PKEY_ECC;
# endif
    }
    return -1;
}

Project: openssl

size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs)
{
    /*
     * If Suite B mode use Suite B sigalgs only, ignore any other
     * preferences.
     */
# ifndef OPENSSL_NO_EC
    switch (tls1_suiteb(s)) {
    case SSL_CERT_FLAG_SUITEB_128_LOS:
        *psigs = suiteb_sigalgs;
        return sizeof(suiteb_sigalgs);

    case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
        *psigs = suiteb_sigalgs;
        return 2;

    case SSL_CERT_FLAG_SUITEB_192_LOS:
        *psigs = suiteb_sigalgs + 2;
        return 2;
    }
# endif
    /* If server use client authentication sigalgs if not NULL */
    if (s->server && s->cert->client_sigalgs) {
        *psigs = s->cert->client_sigalgs;
        return s->cert->client_sigalgslen;
    } else if (s->cert->conf_sigalgs) {
        *psigs = s->cert->conf_sigalgs;
        return s->cert->conf_sigalgslen;
    } else {
        *psigs = tls12_sigalgs;
        return sizeof(tls12_sigalgs);
    }
}

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,
                          sizeof(tls12_md) / sizeof(tls12_lookup));
    if (md_id == -1)
        return 0;
    sig_id = tls12_get_sigid(pk);
    if (sig_id == -1)
        return 0;
    p[0] = (unsigned char)md_id;
    p[1] = (unsigned char)sig_id;
    return 1;
}

Project: openssl

int tls12_get_sigid(const EVP_PKEY *pk)
{
    return tls12_find_id(pk->type, tls12_sig,
                         sizeof(tls12_sig) / sizeof(tls12_lookup));
}

Project: openssl

static int tls1_alpn_handle_client_hello(SSL *s, const unsigned char *data,
                                         unsigned data_len, int *al)
{
    unsigned i;
    unsigned proto_len;
    const unsigned char *selected;
    unsigned char selected_len;
    int r;

    if (s->ctx->alpn_select_cb == NULL)
        return 0;

    if (data_len < 2)
        goto parse_error;

    /*
     * data should contain a uint16 length followed by a series of 8-bit,
     * length-prefixed strings.
     */
    i = ((unsigned)data[0]) << 8 | ((unsigned)data[1]);
    data_len -= 2;
    data += 2;
    if (data_len != i)
        goto parse_error;

    if (data_len < 2)
        goto parse_error;

    for (i = 0; i < data_len;) {
        proto_len = data[i];
        i++;

        if (proto_len == 0)
            goto parse_error;

        if (i + proto_len < i || i + proto_len > data_len)
            goto parse_error;

        i += proto_len;
    }

    r = s->ctx->alpn_select_cb(s, &selected, &selected_len, data, data_len,
                               s->ctx->alpn_select_cb_arg);
    if (r == SSL_TLSEXT_ERR_OK) {
        if (s->s3->alpn_selected)
            OPENSSL_free(s->s3->alpn_selected);
        s->s3->alpn_selected = OPENSSL_malloc(selected_len);
        if (!s->s3->alpn_selected) {
            *al = SSL_AD_INTERNAL_ERROR;
            return -1;
        }
        memcpy(s->s3->alpn_selected, selected, selected_len);
        s->s3->alpn_selected_len = selected_len;
    }
    return 0;

 parse_error:
    *al = SSL_AD_DECODE_ERROR;
    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_get_pubkey(x);
    if (!pkey)
        return 0;
    /* If not EC nothing to do */
    if (pkey->type != EVP_PKEY_EC) {
        EVP_PKEY_free(pkey);
        return 1;
    }
    rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
    EVP_PKEY_free(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)
                c->pkeys[SSL_PKEY_ECC].digest = EVP_sha256();
            else
                c->pkeys[SSL_PKEY_ECC].digest = 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;
    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;
        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;
# ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
        /* Allow any certificate to pass test */
        if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL) {
            rv = CERT_PKEY_STRICT_FLAGS | CERT_PKEY_EXPLICIT_SIGN |
                CERT_PKEY_VALID | CERT_PKEY_SIGN;
            cpk->valid_flags = rv;
            return rv;
        }
# endif
    } else {
        if (!x || !pk)
            return 0;
        idx = ssl_cert_type(x, pk);
        if (idx == -1)
            return 0;
        cpk = c->pkeys + 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 (c->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:
            case SSL_PKEY_DH_RSA:
                rsign = TLSEXT_signature_rsa;
                default_nid = NID_sha1WithRSAEncryption;
                break;

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

            case SSL_PKEY_ECC:
                rsign = TLSEXT_signature_ecdsa;
                default_nid = NID_ecdsa_with_SHA1;
                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 (pk->type) {
        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;
        case EVP_PKEY_DH:
        case EVP_PKEY_DHX:
            {
                int cert_type = X509_certificate_type(x, pk);
                if (cert_type & EVP_PKS_RSA)
                    check_type = TLS_CT_RSA_FIXED_DH;
                if (cert_type & EVP_PKS_DSA)
                    check_type = TLS_CT_DSS_FIXED_DH;
            }
        }
        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 (cpk->valid_flags & CERT_PKEY_EXPLICIT_SIGN)
            rv |= CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
        else if (cpk->digest)
            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)
            cpk->valid_flags = rv;
        else {
            /* Preserve explicit sign flag, clear rest */
            cpk->valid_flags &= CERT_PKEY_EXPLICIT_SIGN;
            return 0;
        }
    }
    return rv;
}

Project: openssl

int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
{
    const unsigned char *curves;
    size_t num_curves, i;
    unsigned int suiteb_flags = tls1_suiteb(s);
    if (len != 3 || p[0] != NAMED_CURVE_TYPE)
        return 0;
    /* Check curve matches Suite B preferences */
    if (suiteb_flags) {
        unsigned long cid = s->s3->tmp.new_cipher->id;
        if (p[1])
            return 0;
        if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) {
            if (p[2] != TLSEXT_curve_P_256)
                return 0;
        } else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) {
            if (p[2] != TLSEXT_curve_P_384)
                return 0;
        } else                  /* Should never happen */
            return 0;
    }
    if (!tls1_get_curvelist(s, 0, &curves, &num_curves))
        return 0;
    for (i = 0; i < num_curves; i++, curves += 2) {
        if (p[1] == curves[0] && p[2] == curves[1])
            return 1;
    }
    return 0;
}

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;
        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)
            return 1;
    }
    return 1;
}

Project: openssl

int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
{
    unsigned char curve_id[2];
    EC_KEY *ec = s->cert->ecdh_tmp;
#  ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
    /* Allow any curve: not just those peer supports */
    if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
        return 1;
#  endif
    /*
     * If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other
     * curves permitted.
     */
    if (tls1_suiteb(s)) {
        /* 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;
        /* If auto or setting curve from callback assume OK */
        if (s->cert->ecdh_tmp_auto || s->cert->ecdh_tmp_cb)
            return 1;
        /* Otherwise check curve is acceptable */
        else {
            unsigned char curve_tmp[2];
            if (!ec)
                return 0;
            if (!tls1_set_ec_id(curve_tmp, NULL, ec))
                return 0;
            if (!curve_tmp[0] || curve_tmp[1] == curve_id[1])
                return 1;
            return 0;
        }

    }
    if (s->cert->ecdh_tmp_auto) {
        /* Need a shared curve */
        if (tls1_shared_curve(s, 0))
            return 1;
        else
            return 0;
    }
    if (!ec) {
        if (s->cert->ecdh_tmp_cb)
            return 1;
        else
            return 0;
    }
    if (!tls1_set_ec_id(curve_id, NULL, ec))
        return 0;
/* Set this to allow use of invalid curves for testing */
#  if 0
    return 1;
#  else
    return tls1_check_ec_key(s, curve_id, NULL);
#  endif
}

Project: openssl

static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
{
    int sig_nid;
    size_t i;
    if (default_nid == -1)
        return 1;
    sig_nid = X509_get_signature_nid(x);
    if (default_nid)
        return sig_nid == default_nid ? 1 : 0;
    for (i = 0; i < c->shared_sigalgslen; i++)
        if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
            return 1;
    return 0;
}

Project: openssl

void tls1_clear(SSL *s)
{
    ssl3_clear(s);
    s->version = s->method->version;
}

Project: openssl

long tls1_default_timeout(void)
{
    /*
     * 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for
     * http, the cache would over fill
     */
    return (60 * 60 * 2);
}

Project: openssl

int tls1_ec_curve_id2nid(int curve_id)
{
    /* ECC curves from RFC 4492 and RFC 7027 */
    if ((curve_id < 1) || ((unsigned int)curve_id >
                           sizeof(nid_list) / sizeof(nid_list[0])))
        return 0;
    return nid_list[curve_id - 1];
}

Project: openssl

int tls1_ec_nid2curve_id(int nid)
{
    /* ECC curves from RFC 4492 and RFC 7027 */
    switch (nid) {
    case NID_sect163k1:        /* sect163k1 (1) */
        return 1;
    case NID_sect163r1:        /* sect163r1 (2) */
        return 2;
    case NID_sect163r2:        /* sect163r2 (3) */
        return 3;
    case NID_sect193r1:        /* sect193r1 (4) */
        return 4;
    case NID_sect193r2:        /* sect193r2 (5) */
        return 5;
    case NID_sect233k1:        /* sect233k1 (6) */
        return 6;
    case NID_sect233r1:        /* sect233r1 (7) */
        return 7;
    case NID_sect239k1:        /* sect239k1 (8) */
        return 8;
    case NID_sect283k1:        /* sect283k1 (9) */
        return 9;
    case NID_sect283r1:        /* sect283r1 (10) */
        return 10;
    case NID_sect409k1:        /* sect409k1 (11) */
        return 11;
    case NID_sect409r1:        /* sect409r1 (12) */
        return 12;
    case NID_sect571k1:        /* sect571k1 (13) */
        return 13;
    case NID_sect571r1:        /* sect571r1 (14) */
        return 14;
    case NID_secp160k1:        /* secp160k1 (15) */
        return 15;
    case NID_secp160r1:        /* secp160r1 (16) */
        return 16;
    case NID_secp160r2:        /* secp160r2 (17) */
        return 17;
    case NID_secp192k1:        /* secp192k1 (18) */
        return 18;
    case NID_X9_62_prime192v1: /* secp192r1 (19) */
        return 19;
    case NID_secp224k1:        /* secp224k1 (20) */
        return 20;
    case NID_secp224r1:        /* secp224r1 (21) */
        return 21;
    case NID_secp256k1:        /* secp256k1 (22) */
        return 22;
    case NID_X9_62_prime256v1: /* secp256r1 (23) */
        return 23;
    case NID_secp384r1:        /* secp384r1 (24) */
        return 24;
    case NID_secp521r1:        /* secp521r1 (25) */
        return 25;
    case NID_brainpoolP256r1:  /* brainpoolP256r1 (26) */
        return 26;
    case NID_brainpoolP384r1:  /* brainpoolP384r1 (27) */
        return 27;
    case NID_brainpoolP512r1:  /* brainpool512r1 (28) */
        return 28;
    default:
        return 0;
    }
}

Project: openssl

void tls1_free(SSL *s)
{
#ifndef OPENSSL_NO_TLSEXT
    if (s->tlsext_session_ticket) {
        OPENSSL_free(s->tlsext_session_ticket);
    }
#endif                          /* OPENSSL_NO_TLSEXT */
    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) {
# ifdef OPENSSL_FIPS
            if (FIPS_mode()) {
                *pcurves = fips_curves_default;
                pcurveslen = sizeof(fips_curves_default);
            } else
# endif
            {
                *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_get_formatlist(SSL *s, const unsigned char **pformats,
                                size_t *num_formats)
{
    /*
     * If we have a custom point format list use it otherwise use default
     */
    if (s->tlsext_ecpointformatlist) {
        *pformats = s->tlsext_ecpointformatlist;
        *num_formats = s->tlsext_ecpointformatlist_length;
    } else {
        *pformats = ecformats_default;
        /* For Suite B we don't support char2 fields */
        if (tls1_suiteb(s))
            *num_formats = sizeof(ecformats_default) - 1;
        else
            *num_formats = sizeof(ecformats_default);
    }
}

Project: openssl

int tls1_heartbeat(SSL *s)
{
    unsigned char *buf, *p;
    int ret;
    unsigned int payload = 18;  /* Sequence number + random bytes */
    unsigned int padding = 16;  /* Use minimum padding */

    /* Only send if peer supports and accepts HB requests... */
    if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
        s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS) {
        SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
        return -1;
    }

    /* ...and there is none in flight yet... */
    if (s->tlsext_hb_pending) {
        SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PENDING);
        return -1;
    }

    /* ...and no handshake in progress. */
    if (SSL_in_init(s) || s->in_handshake) {
        SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_UNEXPECTED_MESSAGE);
        return -1;
    }

    /*
     * Check if padding is too long, payload and padding must not exceed 2^14
     * - 3 = 16381 bytes in total.
     */
    OPENSSL_assert(payload + padding <= 16381);

    /*-
     * Create HeartBeat message, we just use a sequence number
     * as payload to distuingish different messages and add
     * some random stuff.
     *  - Message Type, 1 byte
     *  - Payload Length, 2 bytes (unsigned int)
     *  - Payload, the sequence number (2 bytes uint)
     *  - Payload, random bytes (16 bytes uint)
     *  - Padding
     */
    buf = OPENSSL_malloc(1 + 2 + payload + padding);
    p = buf;
    /* Message Type */
    *p++ = TLS1_HB_REQUEST;
    /* Payload length (18 bytes here) */
    s2n(payload, p);
    /* Sequence number */
    s2n(s->tlsext_hb_seq, p);
    /* 16 random bytes */
    RAND_pseudo_bytes(p, 16);
    p += 16;
    /* Random padding */
    RAND_pseudo_bytes(p, padding);

    ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
    if (ret >= 0) {
        if (s->msg_callback)
            s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
                            buf, 3 + payload + padding,
                            s, s->msg_callback_arg);

        s->tlsext_hb_pending = 1;
    }

    OPENSSL_free(buf);

    return ret;
}

Project: openssl

static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
                               int *psignhash_nid, const unsigned char *data)
{
    int sign_nid = 0, hash_nid = 0;
    if (!phash_nid && !psign_nid && !psignhash_nid)
        return;
    if (phash_nid || psignhash_nid) {
        hash_nid = tls12_find_nid(data[0], tls12_md,
                                  sizeof(tls12_md) / sizeof(tls12_lookup));
        if (phash_nid)
            *phash_nid = hash_nid;
    }
    if (psign_nid || psignhash_nid) {
        sign_nid = tls12_find_nid(data[1], tls12_sig,
                                  sizeof(tls12_sig) / sizeof(tls12_lookup));
        if (psign_nid)
            *psign_nid = sign_nid;
    }
    if (psignhash_nid) {
        if (sign_nid && hash_nid)
            OBJ_find_sigid_by_algs(psignhash_nid, hash_nid, sign_nid);
        else
            *psignhash_nid = NID_undef;
    }
}

Project: openssl

int tls1_new(SSL *s)
{
    if (!ssl3_new(s))
        return (0);
    s->method->ssl_clear(s);
    return (1);
}

Project: openssl

int tls1_process_heartbeat(SSL *s)
{
    unsigned char *p = &s->s3->rrec.data[0], *pl;
    unsigned short hbtype;
    unsigned int payload;
    unsigned int padding = 16;  /* Use minimum padding */

    if (s->msg_callback)
        s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
                        &s->s3->rrec.data[0], s->s3->rrec.length,
                        s, s->msg_callback_arg);

    /* Read type and payload length first */
    if (1 + 2 + 16 > s->s3->rrec.length)
        return 0;               /* silently discard */
    hbtype = *p++;
    n2s(p, payload);
    if (1 + 2 + payload + 16 > s->s3->rrec.length)
        return 0;               /* silently discard per RFC 6520 sec. 4 */
    pl = p;

    if (hbtype == TLS1_HB_REQUEST) {
        unsigned char *buffer, *bp;
        int r;

        /*
         * Allocate memory for the response, size is 1 bytes message type,
         * plus 2 bytes payload length, plus payload, plus padding
         */
        buffer = OPENSSL_malloc(1 + 2 + payload + padding);
        bp = buffer;

        /* Enter response type, length and copy payload */
        *bp++ = TLS1_HB_RESPONSE;
        s2n(payload, bp);
        memcpy(bp, pl, payload);
        bp += payload;
        /* Random padding */
        RAND_pseudo_bytes(bp, padding);

        r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer,
                             3 + payload + padding);

        if (r >= 0 && s->msg_callback)
            s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
                            buffer, 3 + payload + padding,
                            s, s->msg_callback_arg);

        OPENSSL_free(buffer);

        if (r < 0)
            return r;
    } else if (hbtype == TLS1_HB_RESPONSE) {
        unsigned int seq;

        /*
         * We only send sequence numbers (2 bytes unsigned int), and 16
         * random bytes, so we just try to read the sequence number
         */
        n2s(pl, seq);

        if (payload == 18 && seq == s->tlsext_hb_seq) {
            s->tlsext_hb_seq++;
            s->tlsext_hb_pending = 0;
        }
    }

    return 0;
}

Project: openssl

int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
                        const unsigned char *limit, SSL_SESSION **ret)
{
    /* Point after session ID in client hello */
    const unsigned char *p = session_id + len;
    unsigned short i;

    *ret = NULL;
    s->tlsext_ticket_expected = 0;

    /*
     * If tickets disabled behave as if no ticket present to permit stateful
     * resumption.
     */
    if (SSL_get_options(s) & SSL_OP_NO_TICKET)
        return 0;
    if ((s->version <= SSL3_VERSION) || !limit)
        return 0;
    if (p >= limit)
        return -1;
    /* Skip past DTLS cookie */
    if (SSL_IS_DTLS(s)) {
        i = *(p++);
        p += i;
        if (p >= limit)
            return -1;
    }
    /* Skip past cipher list */
    n2s(p, i);
    p += i;
    if (p >= limit)
        return -1;
    /* Skip past compression algorithm list */
    i = *(p++);
    p += i;
    if (p > limit)
        return -1;
    /* Now at start of extensions */
    if ((p + 2) >= limit)
        return 0;
    n2s(p, i);
    while ((p + 4) <= limit) {
        unsigned short type, size;
        n2s(p, type);
        n2s(p, size);
        if (p + size > limit)
            return 0;
        if (type == TLSEXT_TYPE_session_ticket) {
            int r;
            if (size == 0) {
                /*
                 * The client will accept a ticket but doesn't currently have
                 * one.
                 */
                s->tlsext_ticket_expected = 1;
                return 1;
            }
            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.
                 */
                return 2;
            }
            r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
            switch (r) {
            case 2:            /* ticket couldn't be decrypted */
                s->tlsext_ticket_expected = 1;
                return 2;
            case 3:            /* ticket was decrypted */
                return r;
            case 4:            /* ticket decrypted but need to renew */
                s->tlsext_ticket_expected = 1;
                return 3;
            default:           /* fatal error */
                return -1;
            }
        }
        p += size;
    }
    return 0;
}

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_DH_RSA);
    tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA);
    tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
}

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;
# ifdef OPENSSL_NO_EC2M
    EC_GROUP *curve;
# endif

    clist = OPENSSL_malloc(ncurves * 2);
    if (!clist)
        return 0;
    for (i = 0, p = clist; i < ncurves; i++) {
        unsigned long idmask;
        int id;
        id = tls1_ec_nid2curve_id(curves[i]);
# ifdef OPENSSL_FIPS
        /* NB: 25 is last curve ID supported by FIPS module */
        if (FIPS_mode() && id > 25) {
            OPENSSL_free(clist);
            return 0;
        }
# endif
# ifdef OPENSSL_NO_EC2M
        curve = EC_GROUP_new_by_curve_name(curves[i]);
        if (!curve || EC_METHOD_get_field_type(EC_GROUP_method_of(curve))
            == NID_X9_62_characteristic_two_field) {
            if (curve)
                EC_GROUP_free(curve);
            OPENSSL_free(clist);
            return 0;
        } else
            EC_GROUP_free(curve);
# endif
        idmask = 1L << id;
        if (!id || (dup_list & idmask)) {
            OPENSSL_free(clist);
            return 0;
        }
        dup_list |= idmask;
        s2n(id, p);
    }
    if (*pext)
        OPENSSL_free(*pext);
    *pext = clist;
    *pextlen = ncurves * 2;
    return 1;
}

Project: openssl

int tls1_set_curves_list(unsigned char **pext, size_t *pextlen,
                         const char *str)
{
    nid_cb_st ncb;
    ncb.nidcnt = 0;
    if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
        return 0;
    if (pext == NULL)
        return 1;
    return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
}

Project: openssl

static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
                          EC_KEY *ec)
{
    int is_prime, id;
    const EC_GROUP *grp;
    const EC_METHOD *meth;
    if (!ec)
        return 0;
    /* Determine if it is a prime field */
    grp = EC_KEY_get0_group(ec);
    if (!grp)
        return 0;
    meth = EC_GROUP_method_of(grp);
    if (!meth)
        return 0;
    if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
        is_prime = 1;
    else
        is_prime = 0;
    /* Determine curve ID */
    id = EC_GROUP_get_curve_name(grp);
    id = tls1_ec_nid2curve_id(id);
    /* If we have an ID set it, otherwise set arbitrary explicit curve */
    if (id) {
        curve_id[0] = 0;
        curve_id[1] = (unsigned char)id;
    } else {
        curve_id[0] = 0xff;
        if (is_prime)
            curve_id[1] = 0x01;
        else
            curve_id[1] = 0x02;
    }
    if (comp_id) {
        if (EC_KEY_get0_public_key(ec) == NULL)
            return 0;
        if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED) {
            if (is_prime)
                *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
            else
                *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
        } else
            *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
    }
    return 1;
}